DESC:FIELD
The present disclosure relates to a coating composition and a process for its preparation.
DEFINITIONS
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used indicates otherwise.
Hydrophilic: The term “hydrophilic” refers to a property of a compound having a strong affinity for water. Thus, most of the hydrophilic substances are readily wettable by water.
Dirt pickup resistance (DPUR): The term “Dirt pickup resistance (DPUR)” refers to the ability of coating (e.g. paint) to resist dirt in exposure to natural environments. Though it is named “dirt pickup”, it is not defined in terms of the amount of dirt accumulated on a surface, but in terms of the colour change of a surface before and after a period of exposure.
Wettability: The term “wettability” refers to a property of attraction of a liquid phase to a solid surface, and it is typically quantified by using a contact angle with the solid phase.
Sheen: The term “sheen” refers to a visual property of the substance/material that shines with the reflected light.
Streak: The term “streak” refers to a long, thin line or mark of a different substance or colour from the surroundings.
Streak resistance: The term “streak resistance” refers to the ability of the coating composition to resist the formation of streaks.
Biocide: The term “biocide” refers to a chemical substance or microorganisms intended to destroy, deter, render harmless or exert a controlling effect on any harmful organism.
Exterior primer: The term “exterior primer” refers to a specially formulated
paint which seals the uneven pores and lays the foundation for the finish coats of
the paint.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Coatings are widely used in various applications such as automotive, construction, architecture, wood industries, and the like. The coatings are used for decorative as well as protective purposes. The coatings when applied on the substrate are exposed to environmental conditions such as wind, UV light, rain, haze, and the like. Due to continuous exposure to such environmental conditions, the coatings undergo the phenomenon of discolouration, chalking, peeling, contamination and the like.
Moreover, the coatings are exposed to various environmental contaminants such as organic and inorganic dust, dirt, pollutants, moisture, and the like. These environmental contaminants are suspended in the air and accumulate on the surface of outdoor structures. These accumulated contaminants are either washed away by rainwater or carried by rainwater when it rains and flows down on the surface of outdoor structures. As a result, contaminants are attached to the surface of outdoor structures along with the route of the rainwater. Once the surfaces are dried, the dirt appears on the surfaces. Conventional coatings are associated with the drawback of dirty and dull appearance because of the dirt that clings on them. Moreover, the conventional coating has whitening problems.
Therefore, there is felt a need to provide a coating composition that obviates the drawbacks mentioned hereinabove or at least provide an alternative solution.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.
An object of the present disclosure is to ameliorate one or more problems of the background or to at least provide a useful alternative.
Another object of the present disclosure is to provide a coating composition.
Yet another object of the present disclosure is to provide a coating composition that can resist dirt pick up.
Still another object of the present disclosure is to provide a coating composition that has streak resistance.
Yet another object of the present disclosure is to provide a coating composition that has good durability when exposed to environmental conditions.
Another object of the present disclosure is to provide a coating composition that has high hydrophilicity, improved crack resistance, and flexibility.
Still another object of the present disclosure is to provide a simple and environment friendly process for the preparation of a coating composition.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure relates to a coating composition and a process for its preparation.
In an aspect, the present disclosure relates to a coating composition. The coating composition comprises biocide dispersion, at least one polyurethane dispersion, carbon nanotubes, at least one coupling agent, at least one wetting agent, at least one hydrophilicity agent, and at least one second fluid medium. The biocide dispersion comprises at least one dendrimer polyol, at least one algicide, and at least one first fluid medium.
In a preferred embodiment, in the composition, the biocide dispersion is present in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition, the polyurethane dispersion is present in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of the composition, carbon nanotubes are present in an amount in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of the composition, the coupling agent is present in an amount in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of the composition, the wetting agent is present in an amount in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of the composition, the hydrophilicity agent is present in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of the composition, and at least one second fluid medium is present in an amount in the range of 10 mass% to 20 mass% with respect to the total mass of the composition.
In a preferred embodiment, the composition further comprises a second dendrimer polyol in an amount in the range of 0 mass% to 5 mass% with respect to the total mass of the composition.
In a preferred embodiment, the composition comprises a light stabilizer in an amount in the range of 0 mass% to 1 mass% with respect to the total mass of the composition, and a UV absorber in an amount in the range of 0 mass% to 2 mass% with respect to the total mass of the composition.
In a preferred embodiment, the biocide dispersion comprises the first dendrimer polyol in an amount in the range of 20 mass% to 50 mass% with respect to the total mass of the biocide dispersion, the algicide in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the biocide dispersion, and the first fluid medium in an amount in the range of 50 mass% to 78 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the first dendrimer polyol and the second dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol, and combinations thereof.
In a preferred embodiment, the algicide is at least one selected from the group consisting of 3-(3,4-dichlorophenyl)-1,1-dimethylurea, iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones, and combinations thereof.
In a preferred embodiment, the first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, diacetone alcohol and combinations thereof.
In a preferred embodiment, the biocide dispersion comprises polycarbonate dendrimer polyol as a first dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of the biocide dispersion, 3-(3,4-dichlorophenyl)-1,1-dimethylurea as an algicide in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of the biocide dispersion, and acetone as a first fluid medium in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the polyurethane dispersion is selected from water-based polyurethane dispersion, anionic aliphatic polyurethane dispersion, cyclo-aliphatic polyurethane dispersions, and combinations thereof.
In a preferred embodiment, the coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy functional silane oligomer, epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups, epoxy functional silane oligomer, and combinations thereof.
In a preferred embodiment, the wetting agent is an anionic fluorosurfactant.
In a preferred embodiment, the hydrophilicity agent is at least one selected from the group consisting of colloidal silica, alumina quartz, a combination of colloidal silica and alumina, a combination of colloidal silica, quartz and a combination of alumina and quartz.
In a preferred embodiment, the second fluid medium is at least one selected from the group consisting of water, glycol and a combination of water and glycol.
In a preferred embodiment, the composition comprises the biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition, water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition, carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition, epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition, anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition, colloidal silica as a hydrophilicity agent in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition, and water as a second fluid medium in an amount in the range of 11 mass% to 18 mass% with respect to the total mass of the composition.
In a preferred embodiment, the composition comprises the biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition, water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of the composition, carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition, epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition, anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition, colloidal silica as a hydrophilicity agent in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of the composition, and water as a second fluid medium in an amount in the range of 12 mass% to 16 mass% with respect to the total mass of the composition.
In another aspect, the present disclosure relates to a process for the preparation of a coating composition. The process comprises mixing a predetermined amount of at least one first dendrimer polyol and a predetermined amount of at least one algicide under stirring at a first predetermined speed for a first predetermined time period to obtain a first mixture. A first fluid medium is added to the first mixture under stirring at a second predetermined speed for a second predetermined time period to obtain a biocide dispersion. The biocide dispersion is mixed with the homogeneous polyurethane dispersion under stirring at a third predetermined speed for a third predetermined time period to obtain a second mixture. Predetermined amounts of carbon nanotubes, at least one coupling agent, at least one wetting agent are added into the second mixture under stirring at a fourth predetermined speed for a fourth predetermined time period to obtain a third mixture. A predetermined amount of at least one hydrophilicity agent is added to the third mixture followed by lowering the stirring speed in the range of 200 rpm to 500 rpm to obtain a fourth mixture. A second fluid medium is mixed with the fourth mixture to obtain the coating composition.
In a preferred embodiment, the predetermined amount of the first dendrimer polyol is in the range of 20 mass% to 50 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the first dendrimer polyol and the second dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol, and combinations thereof.
In a preferred embodiment, polycarbonate dendrimer polyol as a first dendrimer polyol is present in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the predetermined amount of the algicide is in the range of 2 mass% to 8 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the algicide is at least one selected from the group consisting of 3-(3,4-dichlorophenyl)-1,1-dimethylurea, iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones, and combinations thereof.
In a preferred embodiment, the algicide is 3-(3,4-dichlorophenyl)-1,1-dimethylurea in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the first predetermined speed is in the range of 250 rpm to 500 rpm, and the first predetermined time period is in the range of 2 minutes to 20 minutes.
In a preferred embodiment, the first predetermined speed is in the range of 230 rpm to 400 rpm, and the first predetermined time period is 3 minutes to 10 minutes.
In a preferred embodiment, the first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, diacetone alcohol and combinations thereof.
In a preferred embodiment, the predetermined amount of the first fluid medium is in the range of 50 mass% to 78 mass% with respect to the total amount of the biocide dispersion.
In a preferred embodiment, the first fluid medium is acetone in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of the biocide dispersion.
In a preferred embodiment, the second predetermined speed is in the range of 250 rpm to 500 rpm, and the second predetermined time period is in the range of 5 minutes to 25 minutes.
In a preferred embodiment, the second predetermined speed is in the range of 300 rpm to 500 rpm, and the second predetermined time period is 10 minutes to 20 minutes.
In a preferred embodiment, the predetermined amount of the polyurethane dispersion is in the range of 25 mass% to 55 mass% with respect to the total mass of the composition.
In a preferred embodiment, the homogeneous polyurethane dispersion is selected from water based polyurethane dispersion, anionic aliphatic polyurethane dispersion, cyclo-aliphatic polyurethane dispersions, and combinations thereof.
In a preferred embodiment, the polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition.
In a preferred embodiment, the polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of the composition.
In a preferred embodiment, the third predetermined speed is in the range of 500 rpm to 1000 rpm, and the third predetermined time period is in the range of 5 minutes to 25 minutes.
In a preferred embodiment, the third predetermined speed is in the range of 600 rpm to 800 rpm, and the third predetermined time period is in the range of 7 minutes to 20 minutes.
In a preferred embodiment, the predetermined amount of the carbon nanotubes is in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of the composition.
In a preferred embodiment, the predetermined amount of the carbon nanotubes is in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition.
In a preferred embodiment, the predetermined amount of the coupling agent is in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of the composition.
In a preferred embodiment, the coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy functional silane oligomer, epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups, epoxy functional silane oligomer, and combinations thereof.
In a preferred embodiment, the coupling agent is epoxy silane in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition.
In a preferred embodiment, the predetermined amount of the wetting agent is in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of the composition.
In a preferred embodiment, the wetting agent is an anionic fluorosurfactant.
In a preferred embodiment, the wetting agent is anionic fluorosurfactant in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition.
In a preferred embodiment, the fourth predetermined speed is in the range of 500 rpm to 1000 rpm, and the fourth predetermined time period is in the range of 3 minutes to 15 minutes.
In a preferred embodiment, the fourth predetermined speed is in the range of 600 rpm to 900 rpm, and the fourth predetermined time period is in the range of 3 minutes to 10 minutes.
In a preferred embodiment, the predetermined amount of the hydrophilicity agent is in the range of 25 mass% to 55 mass% with respect to the total mass of the composition.
In a preferred embodiment, the hydrophilicity agent is at least one selected from the group consisting of colloidal silica, alumina quartz, a combination of colloidal silica and alumina, a combination of colloidal silica and quartz and a combination of alumina and quartz.
In a preferred embodiment, the hydrophilicity agent is colloidal silica in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition.
In a preferred embodiment, the hydrophilicity agent is colloidal silica in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of the composition.
In a preferred embodiment, the predetermined amount of the second fluid medium is in the range of 10 mass% to 20 mass% with respect to the total amount of the composition.
In a preferred embodiment, the second fluid medium is at least one selected from the group consisting of water, and glycol and a combination of water and glycol.
In a preferred embodiment, the second fluid medium is water in an amount in the range of 11 mass% to 18 mass% with respect to the total amount of the composition.
In a preferred embodiment, the second fluid medium is water in an amount in the range of 12 mass% to 16 mass% with respect to the total amount of the composition.
In a preferred embodiment, the film made using the composition of the present disclosure is characterized by having an elongation in the range of 300 % to 500% when measured as per ASTM D 2370 standard, a tensile strength in the range of 10 mPa to 30 mPa when measured as per ASTM D 2370 standard, and sheen @ 60 degree in the range of 10 GU to 30 GU, when measured as per ASTM D 523 standard.
In a preferred embodiment, the film made using the composition of the present disclosure is characterized by having elongation in the range of 320 % to 480%%, when measured as per ASTM D 2370 standard, tensile strength in the range of 11 mPa to 25 mPa%, when measured as per ASTM D 2370 standard, and sheen @ 60 degree in the range of 12 GU to 28 GU, when measured as per ASTM D 523 standard.
In a preferred embodiment, the film made using the composition of the present disclosure is characterized by having elongation in the range of 330% to 450% when measured as per ASTM D 2370 standard, tensile strength in the range of 12 mPa to 22 mPa when measured as per ASTM D 2370 standard, and sheen @ 60 degree in the range of 15 GU to 27 GU sheen @ 60 degree, when measured as per ASTM D 523 standard.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING
The present disclosure will now be described with the help of the accompanying drawing, in which:
FIGURE 1: illustrates test panels demonstrating the crack resistance and sheen retention: (a) a test panel coated with 40% silica and 0.25% coupling agent (not in accordance with the present disclosure), (b) a test panel coated with 40% silica and 0.5% coupling agent (not in accordance with the present disclosure), (c) a test panel coated with 40% silica and 1% coupling agent (in accordance with the present disclosure), (d) a test panel coated with 40% silica and 2% coupling agent (in accordance with the present disclosure), (e) a test panel coated with 50% silica and 0.25% coupling agent (not in accordance with the present disclosure), (f) a test panel coated with 50% silica and 0.5% coupling agent (not in accordance with the present disclosure, (g) a test panel coated with 50% silica and 1% coupling agent (in accordance with the present disclosure), and (h) a test panel coated with 50% silica and 2% coupling agent (in accordance with the present disclosure);
FIGURE 2: illustrates test panels demonstrating the streak resistance: (a) test panels coated with premium emulsion paint only (control), and (b) test panels coated with the coating composition of experiment no.1 of the present disclosure over the premium emulsion paint;
FIGURE 3: illustrates test panels demonstrating the streak resistance: (a) test panels coated with premium emulsion paint only (control), and (b) test panels coated with the coating composition of experiment no. 2 of the present disclosure over the premium emulsion paint coat;
FIGURE 4: illustrates test panels demonstrating the dirt pick up resistant (DPUR) performance after 2 years of natural exposure: (a) test panel coated with exterior premium emulsion paint only (control), (b) test panel coated with the coating composition of experiment no. 1 of the present disclosure over the exterior premium emulsion paint, and (c) test panel coated with the commercial clear (silica acrylic hybrid clear coat) coat over the exterior premium emulsion paint (control 1);
FIGURE 5: illustrates test panels demonstrating the dirt pick up resistant (DPUR) performance after 2 years of natural exposure: (a) test panel coated with exterior premium emulsion paint only (control), (b) test panel coated with the coating composition of experiment no. 2 of the present disclosure over the exterior premium emulsion paint, and (c) test panel coated with the commercial clear (silica acrylic hybrid clear coat) coat over the exterior premium emulsion paint (control 1);
FIGURE 6: illustrates test walls demonstrating the horizontal dirt pick up resistant (DPUR) performance after natural exposure of 10 months including one full monsoon: (a) test wall coated with exterior premium emulsion paint only (control), (b) test wall coated with the coating composition of experiment no. 1 of the present disclosure over the exterior premium emulsion paint, and (c) test wall coated with the commercial clear (silica acrylic hybrid clear coat) coat over the exterior premium emulsion paint (control 1); and
FIGURE 7: illustrates test walls demonstrating the vertical dirt pick up resistant (DPUR) performance after natural exposure of 10 months including one full monsoon: (a) test wall coated with exterior premium emulsion paint only (control), (b) test wall coated with the coating composition of experiment no. 1 of the present disclosure over the exterior premium emulsion paint, and (c) test wall coated with the commercial clear (silica acrylic hybrid clear coat) coat over the exterior premium emulsion paint (control 1).
DETAILED DESCRIPTION
The present disclosure relates to a coating composition and a process for the preparation of the same.
Embodiments of the present disclosure will now be described with reference to the accompanying drawing.
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details, are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
Coatings are widely used in various applications such as automotive, construction, architecture, wood industries, and the like. The coatings are used for decorative as well as protective purposes. The coatings when applied on the substrate are exposed to environmental conditions such as wind, UV light, rain, haze, and the like. Due to continuous exposure to such environmental conditions, the coatings undergo the phenomenon of discolouration, chalking, peeling, contamination and the like.
Moreover, the coatings are exposed to various environmental contaminants such as organic and inorganic dust, dirt, pollutants, moisture, and the like. These environmental contaminants are suspended in the air and accumulate on the surface of outdoor structures. These accumulated contaminants are either washed away by rainwater or carried by rainwater when it rains and flows down on the surface of outdoor structures. As a result, contaminants are attached to the surface of outdoor structures along with the route of the rainwater. Once the surfaces are dried, the dirt appears on the surfaces. Conventional coatings are associated with the drawback of a dirty and dull appearance because of the dirt that clings on them. Moreover, the conventional coating has whitening problems.
The present disclosure provides a coating composition and a process for its preparation.
In an aspect, the present disclosure provides a coating composition. The coating composition comprises:
• a biocide dispersion of:
? at least one first dendrimer polyol;
? at least one algicide; and
? at least one first fluid medium;
• at least one polyurethane dispersion;
• carbon nanotubes;
• at least one coupling agent;
• at least one wetting agent;
• at least one hydrophilicity agent; and
• at least one second fluid medium.
In an embodiment of the present disclosure, the coating composition comprises biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises biocide dispersion in an amount of 4 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the biocide dispersion comprises at least one first dendrimer polyol in an amount in the range of 20 mass% to 50 mass% with respect to the total mass of the biocide dispersion. In an exemplary embodiment of the present disclosure, the dendrimer polyol is present in an amount of 31.83 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the first dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol and combinations thereof. In an exemplary embodiment of the present disclosure, the first polymeric dendrimer compound is polycarbonate dendrimer polyol (Quickstar 384X).
The dendrimer polyol functions as a dispersion aid. It encapsulates the algicide and helps in enhancing the hydrophilicity and flexibility of the coating composition.
In an embodiment of the present disclosure, the dendrimer polyol facilitates the biocide dispersion without compromising the hydrophilicity and improves the flexibility of the coating.
In an embodiment of the present disclosure, the biocide dispersion comprises the algicide in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the biocide dispersion. In an exemplary embodiment of the present disclosure, the algicide is present in an amount of 4.5 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the biocide dispersion comprises the first fluid medium in an amount in the range of 50 mass% to 78 mass% with respect to the total mass of the biocide dispersion. In an exemplary embodiment of the present disclosure, the first fluid medium is present in an amount of 63.67 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the biocide dispersion comprises polycarbonate dendrimer polyol as a first dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of the biocide dispersion, 3-(3,4-dichlorophenyl)-1,1-dimethylurea as an algicide in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of the biocide dispersion; and acetone as a first fluid medium in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the coating composition comprises polyurethane dispersion in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises polyurethane dispersion in an amount of 44 mass% with respect to the total mass of the composition. In another exemplary embodiment of the present disclosure, the coating composition comprises polyurethane dispersion in an amount of 36.35 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises carbon nanotubes in an amount in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises carbon nanotubes in an amount of 0.3 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises coupling agent in an amount in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises a coupling agent in an amount of 1 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises a wetting agent in an amount in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises a coupling agent in an amount of 0.15 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises hydrophilicity agent in an amount in the range 25 mass% to 55 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises hydrophilicity agent in an amount of 35.4 mass% with respect to the total mass of the composition. In an another exemplary embodiment of the present disclosure, the coating composition comprises hydrophilicity agent in an amount of 44.5 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises at least one second fluid medium in an amount in the range 10 mass% to 20 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises second fluid medium in an amount of 15.15 mass% with respect to the total mass of the composition. In an another exemplary embodiment of the present disclosure, the coating composition comprises second fluid medium in an amount of 13.1 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the algicide is at least one selected from the group consisting of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (Diuron/Preventol A6), iodopropynyl butylcarbamate, and 2-n-Octyl-4-isothiazolin-3-ones, and combinations thereof. In an exemplary embodiment of the present disclosure, the algicide is 3-(3,4-dichlorophenyl)-1,1-dimethylurea.
In accordance with the embodiments of the present disclosure, iodopropynyl butylcarbamate, and 2-n-Octyl-4-isothiazolin-3-ones, and combinations thereof also gives similar prevention from algal growth.
Algicide prevents algal growth in the exterior coating composition.
In an embodiment of the present disclosure, the first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, and diacetone alcohol, and combinations thereof. In an exemplary embodiment of the present disclosure, the first fluid medium is acetone.
The first fluid medium along with the polymeric dendrimer compound helps in the uniform dispersion of algicide.
In accordance with the embodiments of the present disclosure, methyl ethyl ketone, diacetone alcohol, and combinations thereof, as the first fluid medium along with the first polymeric dendrimer compound provide similar uniform dispersion of algicide.
In an embodiment of the present disclosure, the polyurethane dispersion is selected from water based polyurethane dispersion (KamthaneK-164PP), anionic aliphatic polyurethane dispersion (Bayhydrol UH 2606), cyclo-aliphatic polyurethane dispersions, and combinations thereof. In an exemplary embodiment of the present disclosure, the polyurethane dispersion is water based polyurethane dispersion.
In an embodiment of the present disclosure, the biocide dispersion comprises polycarbonate dendrimer polyol as a first dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of the biocide dispersion, 3-(3,4-dichlorophenyl)-1,1-dimethylurea as an algicide in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of the biocide dispersion, and acetone as a first fluid medium in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of the biocide dispersion.
The polyurethane dispersion enhances the binding, adhesion, mechanical strength, water resistance, alkali resistance and film forming properties of the coating composition.
In an embodiment of the present disclosure, the coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy functional silane oligomer, epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups (CoatOSil MP 200), epoxy functional silane oligomer (CoatOSil MP 400) and combinations thereof. In an exemplary embodiment of the present disclosure, the coupling agent is epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups.
The coupling agent disperses easily due to its hydrophilic nature. Further, the coupling agent helps in crosslinking with the polyurethane dispersion and crack prevention. The coupling agent has oxirane functionality (apart from the alcoxy functionality) which reacts with carboxy functionality of the polyurethane dispersion.
In accordance with the present disclosure, the coupling agent can be easily incorporated into an aqueous system.
In an embodiment of the present disclosure, the wetting agent is an anionic fluorosurfactant. In an exemplary embodiment of the present disclosure, the wetting agent is anionic fluorosurfactant.
The wetting agent is used for substrate wetting.
In an embodiment of the present disclosure, the hydrophilicity agent is at least one selected from the group consisting of colloidal silica (Levasil CC 301), alumina (aluminium oxide), quartz and combinations thereof. In an exemplary embodiment of the present disclosure, the hydrophilicity agent is colloidal silica.
In an embodiment of the present disclosure, the colloidal silica comprises about 28% solids by weight having a particle size in the range of 4 nm to 10 nm.
The hydrophilicity agent enhances the hydrophilicity and the surface hardness of the coating.
In an embodiment of the present disclosure, the second fluid medium is at least one selected from the group consisting of water, glycol and a combination of water and glycol. In an exemplary embodiment of the present disclosure, the second fluid medium is water. In another exemplary embodiment of the present disclosure, the second fluid medium is a mixture of water and glycol.
In an embodiment of the present disclosure, the coating composition comprises at least one light stabilizer.
In an embodiment of the present disclosure, the light stabilizer is selected from non-basic aminoether (NOR) hindered amine light stabilizer (HALS) (Tinuvin 123 DW). In an exemplary embodiment of the present disclosure, the light stabilizer is Tinuvin 123 DW.
In an embodiment of the present disclosure, the coating composition comprises at least one UV absorber.
In an embodiment of the present disclosure, the UV absorber is selected from an aqueous dispersion of a 2-hydroxy-phenyl-s-triazine (HPT) (Tinuvin 400 DW). In an exemplary embodiment of the present disclosure, the UV absorber is Tinuvin 400 DW.
In an embodiment of the present disclosure, the coating composition comprises light stabilizer in an amount in the range 0 mass% to 1 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises light stabilizer in an amount of 0.3 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coating composition comprises a UV absorber in an amount in the range 0 mass% to 2 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the coating composition comprises UV absorber in an amount of 0.5 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the composition comprises the biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition, water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition, carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition, epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition, anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition, colloidal silica as a hydrophilicity agent in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition, and water as a second fluid medium in an amount in the range of 11 mass% to 18 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the composition comprises the biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of the composition, water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of the composition, carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition, epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition, anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition, colloidal silica as a hydrophilicity agent in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of the composition and water as a second fluid medium in an amount in the range of 12 mass% to 16 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the composition further comprises a second dendrimer polyol in an amount in the range of 0 mass% to 5 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the composition comprises a second dendrimer polyol in an amount in the range of 0.2 mass% to 5 mass% with respect to the total mass of the composition.
In an exemplary embodiment, the composition comprises a second dendrimer polyol in an amount of 0.6 mass%.
In an embodiment of the present disclosure, a film is prepared using the coating composition of the present disclosure. For the preparation of the films, any conventional process may be used.
In an embodiment of the present disclosure, the film prepared using the coating composition of the present disclosure has a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017) standard.
In another embodiment, the film has a thickness in the range of 20 microns to 40 microns, when measured as per ASTM D6132-13(2017) standard.
In an embodiment of the present disclosure, a film prepared using the coating composition, and having a thickness in the range of 20 microns to 50 microns ( when measured as per ASTM D6132-13(2017) standard) is characterized by having:
1. elongation in the range of 300 % to 500%%, when measured as per ASTM D 2370 standard;
2. tensile strength in the range of 10 mPa to 30 mPa%, when measured as per ASTM D 2370 standard; and
3. sheen @ 60 degree head by glossometer is in the range of 10 GU to 30 GU (gloss units) , when measured as per ASTM D 523 standard.
In another embodiment of the present disclosure, the film is characterized by having:
• elongation in the range of 320 % to 480%%, when measured as per ASTM D 2370 standard;
• tensile strength in the range of 11 mPa to 25 mPa%, when measured as per ASTM D 2370 standard; and
• sheen @ 60 degree in the range of 12 GU to 28 GU, when measured as per ASTM D 523 standard.
In yet another embodiment of the present disclosure, the film is characterized by having:
• elongation in the range of 330% to 450%%, when measured as per ASTM D 2370 standard;
• tensile strength in the range of 12 mPa to 22 mPa%, when measured as per ASTM D 2370 standard; and
• sheen @ 60 degree in the range of 15 GU to 27 GU sheen @ 60 degree, when measured as per ASTM D 523 standard.
In an exemplary embodiment of the present disclosure, the film prepared by using the coating composition is characterized by having elongation of 354%%, when measured as per ASTM D 2370 standard, tensile strength of 21.5 mPa%, when measured as per ASTM D 2370 standard and sheen @ 60 degree head by glossometer of 25.2 GU, when measured as per ASTM D 523 standard. In another exemplary embodiment of the present disclosure, the the film prepared by using the coating composition is characterized by having elongation of 425%, tensile strength of 14.5 mPa and sheen @ 60 degree head by glossometer of 17.4 GU, when measured as per ASTM D 523 standard.
In another aspect, the present disclosure provides a process for the preparation of a coating composition. The process for the preparation of coating composition comprises the following steps:
• mixing a predetermined amount of at least one first dendrimer polyol and a predetermined amount of at least one algicide under stirring at a first predetermined speed for a first predetermined time period to obtain a first mixture;
• adding a first fluid medium to the first mixture under stirring at a second predetermined speed for a second predetermined time period to obtain a biocide dispersion;
• mixing the biocide dispersion and a homogeneous polyurethane dispersion under stirring at a third predetermined speed for a third predetermined time period to obtain a second mixture;
• adding predetermined amounts of carbon nanotubes, at least one coupling agent, at least one wetting agent into the second mixture under stirring at a fourth predetermined speed for a fourth predetermined time period to obtain a third mixture;
• adding a predetermined amount of at least one hydrophilicity agent into the third mixture followed by lowering the stirring speed in the range of 200 rpm to 500 rpm to obtain a fourth mixture; and
• mixing a second fluid medium with the fourth mixture to obtain the coating composition.
The process of the present disclosure is described in detail.
In a first step of the process for the preparation of a coating composition, a predetermined amount of at least one first dendrimer polyol and a predetermined amount of at least one algicide are mixed under stirring at a first predetermined speed for a first predetermined time period to obtain a first mixture.
In an embodiment of the present disclosure, the predetermined amount of the first dendrimer polyol is in the range of 20 mass% to 50 mass% with respect to the total mass of the biocide dispersion. In an exemplary embodiment of the present disclosure, the predetermined amount of the dendrimer polyol is 31.83 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the first dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol, and combinations thereof. In an exemplary embodiment of the present disclosure, the dendrimer polyol is polycarbonate dendrimer polyol.
In an embodiment of the present disclosure, the first dendrimer polyol is polycarbonate dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the predetermined amount of the algicide is in the range of 2 mass% to 8 mass% with respect to the total mass of the biocide dispersion. In an exemplary embodiment of the present disclosure, the predetermined amount of the algicide is 4.5 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the algicide is at least one selected from the group consisting of polycarbonate dendrimer 3-(3,4-dichlorophenyl)-1,1-dimethylurea, iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones and combinations thereof. In an exemplary embodiment of the present disclosure, the algicide is polycarbonate dendrimer 3-(3,4-dichlorophenyl)-1,1-dimethylurea.
In an embodiment of the present disclosure, the algicide is 3-(3,4-dichlorophenyl)-1,1-dimethylurea in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the first predetermined speed is in the range of 250 rpm to 500 rpm. In an exemplary embodiment of the present disclosure, the first predetermined speed is 300 rpm.
In an embodiment of the present disclosure, the first predetermined time period is in the range of 2 minutes to 20 minutes. In an exemplary embodiment of the present disclosure, the first predetermined time period is 5 minutes.
In an embodiment of the present disclosure, the first predetermined speed is in the range of 230 rpm to 400 rpm; and the first predetermined time period is 3 minutes to 10 minutes.
In the second step of the process for the preparation of the coating composition, a first fluid medium is added to first mixture under stirring at a second predetermined speed for a second predetermined time period to obtain a biocide dispersion.
In an embodiment of the present disclosure, first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, diacetone alcohol, and combinations thereof. In an exemplary embodiment of the present disclosure, the first fluid medium is acetone.
In an embodiment of the present disclosure, the predetermined amount of the first fluid medium is in the range of 50 mass% to 78 mass% with respect to the total amount of the biocide dispersion.
In an embodiment of the present disclosure, the first fluid medium is acetone in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of the biocide dispersion.
In an embodiment of the present disclosure, the second predetermined speed is in the range of 250 rpm to 500 rpm. In another embodiment of the present disclosure, the second predetermined speed is in the range of 300 rpm to 500 rpm. In an exemplary embodiment of the present disclosure, the second predetermined speed is 350 rpm.
In an embodiment of the present disclosure, the second predetermined time period is in the range of 5 minutes to 25 minutes. In another embodiment, the second predetermined time period is 10 minutes to 20 minutes. In an exemplary embodiment of the present disclosure, the second predetermined time period is 15 minutes.
In a third step of the process for the preparation of a coating composition, the biocide dispersion and a homogeneous polyurethane dispersion are mixed under stirring at a third predetermined speed for a third predetermined time period to obtain a second mixture.
In an embodiment of the present disclosure, the predetermined amount of polyurethane dispersion is in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the predetermined amount of homogeneous polyurethane dispersion is 44 mass% with respect to the total mass of the composition. In another exemplary embodiment of the present disclosure, the predetermined amount of homogeneous polyurethane dispersion is 36.35 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the polyurethane dispersion is selected from water based polyurethane dispersion, anionic aliphatic polyurethane dispersion, cyclo-aliphatic polyurethane dispersions, and combinations thereof. In an exemplary embodiment of the present disclosure, the homogeneous polyurethane dispersion is water based polyurethane dispersion.
In an embodiment of the present disclosure, the third predetermined speed is in the range of 500 rpm to 1000 rpm. In another embodiment of the present disclosure, the third predetermined speed is in the range of 600 rpm to 800 rpm. In an exemplary embodiment of the present disclosure, the third predetermined speed is 750 rpm.
In an embodiment of the present disclosure, the third predetermined time period is in the range of 5 minutes to 25 minutes. In another embodiment, the third predetermined time period is in the range of 7 minutes to 20 minutes. In an exemplary embodiment of the present disclosure, the third predetermined time period is 15 minutes.
In a fourth step of the process for the preparation of a coating composition, a predetermined amounts of carbon nanotubes, at least one coupling agent, at least one wetting agent are added into the second mixture under stirring at a fourth predetermined speed for a fourth predetermined time period to obtain a third mixture.
The carbon nanoparticle enhances the surface polarity and hydrophilicity of the coating composition. These are single wall carbon nanotubes with carbon content of > 85%, CNT content of > 75%, an outer mean diameter of 1.8 nm, and length of 5 microns. In an exemplary embodiment of the present disclosure, the carbon nanotubes are Tuball coat E H2O 0.4% from OCSiAl.
In an embodiment of the present disclosure, the predetermined amount of the carbon nanotubes is in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the predetermined amount of the carbon nanotubes is 0.3 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the predetermined amount of the carbon nanotubes are the range of 0.1 mass% to 0.4 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the predetermined amount of the coupling agent is in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the predetermined amount of the coupling agent is 1 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy silane, epoxy functional silane oligomer and epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups. In an exemplary embodiment of the present disclosure, the coupling agent is epoxy silane.
In an embodiment of the present disclosure, the coupling agent is epoxy silane in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the predetermined amount of the wetting agent is in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the predetermined amount of the wetting agent is 0.15 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the wetting agent is an anionic fluorosurfactant. In an exemplary embodiment of the present disclosure, the wetting agent is an anionic fluorosurfactant.
In an embodiment of the present disclosure, the wetting agent is an anionic fluorosurfactant in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the fourth predetermined speed is in the range of 500 rpm to 1000 rpm. In another embodiment of the present disclosure, the fourth predetermined speed is in the range of 600 rpm to 900 rpm. In an exemplary embodiment of the present disclosure, the fourth predetermined speed is 750 rpm.
In an embodiment of the present disclosure, the fourth predetermined time period is in the range of 3 minutes to 15 minutes. In another embodiment, the fourth predetermined time period is in the range of 3 minutes to 10 minutes. In an exemplary embodiment of the present disclosure, the fourth predetermined time period is 5 minutes.
In a fifth step of the process for the preparation of a coating composition, a predetermined amount of at least one hydrophilicity agent is added into the third mixture followed by lowering the stirring speed in the range of 200 rpm to 500 rpm to obtain a fourth mixture.
In an embodiment of the present disclosure, the predetermined amount of the hydrophilicity agent is in the range of 25 mass% to 55 mass% with respect to the total mass of the composition. In an exemplary embodiment of the present disclosure, the predetermined amount of the hydrophilicity agent is 35.4 mass% with respect to the total mass of the composition. In an another exemplary embodiment of the present disclosure, the predetermined amount of the hydrophilicity agent is 44.5 mass% with respect to the total mass of the composition
In an embodiment of the present disclosure, the hydrophilicity agent is at least one selected from the group consisting of colloidal silica, alumina (aluminium oxide) alumina, quartz, a combination of colloidal silica and alumina, a combination of colloidal silica and quartz and a combination of alumina and quartz. In an exemplary embodiment of the present disclosure, the hydrophilicity agent is colloidal silica.
In an embodiment of the present disclosure, the hydrophilicity agent is colloidal silica in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the hydrophilicity agent is colloidal silica in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of the composition.
In an embodiment of the present disclosure, the predetermined amount of the second fluid medium is in the range of 10 mass% to 20 mass% with respect to the total amount of the composition.
In a last step of the process for the preparation of a coating composition, a second fluid medium is mixed with the fourth mixture to obtain the coating composition.
In an embodiment of the present disclosure, the second fluid medium is at least one selected from the group consisting of water, glycol and a combination of water and glycol. In an exemplary embodiment of the present disclosure, the second fluid medium is a mixture of water and glycol.
In an embodiment of the present disclosure, the second fluid medium is water in an amount in the range of 11 mass% to 18 mass% with respect to the total amount of the composition.
In an embodiment of the present disclosure, the second fluid medium is water in an amount in the range of 12 mass% to 16 mass% with respect to the total amount of the composition.
The coating composition of the present disclosure is water based, and therefore for specific applications, suitable consistency can be adjusted by diluting the composition with water.
The coating composition of the present disclosure, provides dirt pick up resistance (DPUR) and streak resistance on the applied substrate. The coating composition provides enhanced hydrophilicity and surface hardness. The dendrimer polyol also facilitates biocide dispersion without compromising the hydrophilicity and improves the flexibility of the coating. Therefore, the coating composition of the present disclosure provides sustained dirt pick up resistance and streak resistance for exterior systems where the conventional coatings do not meet the desired performance.
The coating composition of the present disclosure forms the coating on a variety of architectural surfaces like masonry, stucco, brick, cement plaster, wood, painted surfaces, and the like and imparts desired hydrophilicity and water wettability to overcome the dirt streaks formation on the resulting surface. The coating composition when applied to architectural surfaces like masonry, stucco, brick, cement plaster, wood, painted surfaces and the like can resist dirt pick up and facilitates dirt cleaning with water washing or rainwater washing for a sustained clean look. The coating composition is optically neutral and hence does not negatively affect the colour or shade of the substrate/undercoat/ underneath coat. The coating composition is unique where it enables the significant loading of surface hydrophilicity agent (colloidal silica) in an amount in the range of 40 mass % to 50 mass % based on the mass of dry film without the crack formation when applied at a specified dry film thickness and obtain the desired performances. The specific dry film thickness is in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017) standard. Despite high hydrophilicity, it shows very good water whitening/blanching resistance.
The coating composition with high content of surface hydrophilicity agent (Colloidal silica) enables improved durability as measured by sheen retention in QUVB (Accelerated Weathering Tester) exposure, thus providing better durability performance on the exterior exposure. The coating composition has specific biocide dispersion by using the dendrimer polyol which facilitates easy incorporation of the biocide without compromising the hydrophilicity and improves the crack resistance and flexibility simultaneously.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment, but, are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments can be scaled up to industrial/commercial scale and the results obtained can be extrapolated to industrial scale.
EXPERIMENTAL DETAILS
Experiment no 1: Process for the preparation of the coating composition in accordance with the present disclosure.
Step 1: Preparation of the biocide dispersion in accordance with the present disclosure.
79.575 gm of a polycarbonate dendrimer polyol (Quickstar 384X) (dendrimer polyol) was charged into a reactor equipped with high speed dispenser arrangement followed by adding 11.25 gm of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (diuron powder) (algicide) under stirring at a speed of 300 rpm (first predetermined speed) for 5 minutes (first predetermined time period) so that the granules of 3-(3,4-dichlorophenyl)-1,1-dimethylurea were properly mixed with the polycarbonate dendrimer polyol to obtain a first mixture. 159.175 gm of acetone (first fluid medium) was mixed with so obtained first mixture under stirring at a speed of 350 rpm (second predetermined speed) for 15 minutes (second predetermined time period) to obtain a homogeneous biocide dispersion. The homogeneous biocide dispersion was clear or translucent. Table 1 illustrates the biocide dispersion composition in accordance with the present disclosure.
Table 1: Biocide dispersion composition:
Sr.No Ingredients Wt% Weight
(gms)
1 Diuron powder
(Algicide) 4.5 11.25
2 Quickstar 384X
(polycarbonate dendrimer polyol) 31.83 79.575
3 Acetone
(first fluid medium) 63.67 159.175
Total 100 250
Step 2: Preparation of the coating composition in accordance with the present disclosure.
220 gm of water based polyurethane dispersion ((KamthaneK-164PP) (polyurethane dispersion)) was charged into a reactor and stirred at a speed of 750 rpm for 15 minutes to obtain a homogeneous polyurethane dispersion.
20 gm of biocide dispersion (3-(3,4-dichlorophenyl)-1,1-dimethylurea dispersion) obtained in step 1 was added to the homogeneous polyurethane dispersion under stirring at a speed of 750 rpm (third predetermined speed) for 10 minutes (third predetermined time period) to obtain a second mixture. To the so obtained second mixture, 1.5 gm of carbon nanotubes, 5 gm of epoxy silane (coupling agent), and 0.75 gm of a water-soluble anionic fluorosurfactant ((Capstone FS-93)(wetting agent)) were added and blended for 5 minutes (fourth predetermined time period) at a speed of 750 rpm (fourth predetermined speed) to obtain a third mixture. 177 gm of colloidal silica (Levasil CC-301) (hydrophilicity agent) was added to the so obtained third mixture followed by gradually lowering the stirring speed from 750 rpm to 400 rpm to obtain a fourth mixture. 75.75 gm of water (second fluid medium) was mixed with the fourth mixture to obtain the coating composition.
Experiment no 2: Process for the preparation of the coating composition in accordance with the present disclosure.
Step 1: Preparation of the biocide dispersion in accordance with the present disclosure.
The biocide dispersion was prepared in a similar manner as prepared in step 1 of experiment 1.
Step 2: Preparation of the coating composition in accordance with the present disclosure.
The coating composition was prepared in the similar manner as prepared in step 2 of experiment 1 except additional 3 gm of polycarbonate polyol dendrimer (Quickstar 384X) (dendrimer polyol) was added along with the other components in the second mixture to obtain the third mixture. Table 2 illustrates the coating composition of experiments 1 and 2.
Table 2: Coating compositions of experiment 1 and experiment 2.
Sr.No Ingredients * Step 2 of exp 1
(Wt%) **Step 2 of exp 2
(Wt%) Wt for
(Batch 500 gms)
Exp 1
(gms) Wt for
(Batch 500 gms)
Exp-2
(gms)
1 Water
(second fluid medium) 15.15 13.1 75.75 65.5
2 (Colloidal silica )
(Levasil CC-301)
(hydrophilicity agent) 35.4 44.5 177 222.5
3 (Kamthane K-1492/ KamthaneK-164PP)
(Polyurethane dispersion) 44 36.35 220 181.75
4 Tuball
(Carbon nano tubes) 0.3 0.3 1.5 1.5
5 CoatOSil MP-200 / MP – 400 Epoxy Silane
(Coupling agent) 1 1 5 5
6 Capstone FS-93
(wetting agent) 0.15 0.15 0.75 0.75
7 Biocide
Dispersion 4 4 20 20
8 Quickstar 384X
(Polymeric dendrimer)
(dendrimer polyol) -- 0.6 -- 3
Total 100 100 500 500
Characterization:
i) Characterization of the biocide dispersion prepared in accordance with the present disclosure:
The biocide dispersion prepared in step 1 of experiment 1 was kept in a hot box at 55 °C for 15 days and assessed for any phase separation or particle formation. The phase separation or particle formation was not observed. The dispersion was found to be satisfactory showing good shelf stability.
ii) Characterization/Evaluation of the Coating composition prepared in accordance with the present disclosure.
Cement composite test panels and glass test panels were used for the characterization/evaluation of the coating composition prepared in accordance with the present disclosure.
Preparation of cement composite test panels:
A first coat of commercial premium quality emulsion paint was applied on a 6 inch X 3 inch size cement composite panels followed by drying for 4 hours to obtain a panel coated with the first coat. A second coat of the commercial premium quality emulsion paint was applied on the panel coated with the first coat and dried for 4 hours to obtain a panel coated with the second coat (control). A coat of silica acrylic hybrid clear coat was applied on the panel coated with the second coat to obtain a panel coated with silica acrylic hybrid clear coat (control 1).
A coat of the coating composition prepared in accordance with the present disclosure (Experiment no 1/experiment no 2) was applied on the panel coated with the second coat and were allowed to cure for 7 days. The curing for 7 days was done by air drying which ensures the respective crosslinking of the silanes groups/ oxirane group and carboxy group to have mechanically robust cured film having a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017) standard, and to obtain the cement composite test panels.
Preparation of glass test panels:
A 6 inch X 3 inch glass test panels were prepared by following the similar procedure which was used to obtain the cement composite test panels. The glass panel coated with the first coat and the second coat of the premium quality emulsion paint followed by a coat of silica acrylic hybrid clear coat were referred as control 2. The panels had a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017) standard.
The cement composite test panels and the glass test panels were subjected to the evaluation of the following properties:
? The sheen and water resistance were evaluated on the cement composite test panels. The results are demonstrated in table 3.
? The water contact angle and di-iodomethane contact angle were evaluated on the glass test panels. The results are demonstrated in table 3.
? The glass test panels were scrapped to obtain a scrapped layer of coating/film of the coating composition of the present disclosure. The silica percentage was evaluated on the so obtained scrapped layer of coating/film of the coating composition of the present disclosure by using TGA (thermogravimetric analysis). The results are demonstrated in table 3.
Table 3: demonstrates the results of the characterization/evaluation study of the coating composition.
Sr.no Properties Results
Experiment no 1
(In accordance with the present disclosure) Experiment no 2
(In accordance with the present disclosure) Control
(silica acrylic hybrid clear coat)
1 Weight Per Liter
WPL @ 30 °C 1.012 kg 1.012 kg 1.15 kg
2 Viscosity @ 30 °C by Brookfield viscometer 55 cP 55 cP 25 cP
3 Incan appearance Translucent Blackish/ greyish Translucent Blackish/ greyish Whitish liquid
4 Consistency Water like free flowing Water like free flowing Water like free flowing
5 Ease of application Easy to apply by brush/ roller/ spray Easy to apply by brush/ roller/ spray Easy to apply by brush/ roller/ spray
6 application Brush Application Brush Application Brush Application
8 Sheen@60° head by glossometer, when measured as per ASTM D 523 standard 25.2 GU 17.4 GU 42.7 GU
(Control 1)
9 Water resistance (immersion test) @30 °C Passes 24 hours Passes 24 hours Passes 24 hours
(Control 1)
10 Silica content in the dried film by TGA 36.1 44.26 35.91
(Control 2)
11 Water contact angle 47 o 24 o 43
(Control 2)
12 Di-iodomethane contact angle 67o 69 o 89
(Control 2)
From table 3 it was observed that the sheen of the coating composition of experiment 1 and experiment no 2 which were prepared in accordance with the present disclosure is 25.2 GU and 17.4 GU whereas the sheen of control is very high i.e. 42.7 GU, when measured as per ASTM D 523 standard.
Sheen is the optical property of an exterior paint system. Typically, low sheen paints have the sheen values in the range of 10 GU to 20 GU whereas high sheen paints will have the sheen values in the range of 20 GU to 30 GU, when measured as per ASTM D 523 standard. Very high sheen might make the underneath undulations visible, hence much high sheen is generally avoided on exterior paints.
Further, from table 3 it was observed that the silica content of the coating composition of experiment 1 and experiment no 2 which were prepared in accordance with the present disclosure was high compared to the silica content of the control. Higher silica content relates to high durability due to inertness to weather conditions. Hence, the coating composition of experiment 1 and experiment no 2 which were prepared in accordance with the present disclosure will have high durability as compared to the control 2.
Furthermore, from table 3 it is observed that the water contact angle of the coating composition of experiment 2 prepared in accordance with the present disclosure was lower as compared to the water contact angle of the control 2. The water contact angle of the coating composition of experiment 2 prepared in accordance with the present disclosure was low due to highest silica content and additional dendrimer polyol which makes the surface hydrophilic so that the dirt accumulated on the surface can get washed off by water easily.
Still further, a combination of polycarbonate dendrimer polyol and polyester dendrimer polyol in the respective quantity gave similar results. Iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones, and combinations thereof when added as algicide had a similar protection. Experiments were also performed with methyl ethyl ketone, diacetone alcohol and combinations thereof as a first fluid medium, which gave similar flowability. Furthermore, methyl ethyl ketone, diacetone alcohol and combinations thereof as polyurethane dispersion, alumina quartz, a combination of colloidal silica and alumina, a combination of colloidal silica and quartz and a combination of alumina and quartz as hydrophilicity agen, and glycol and a combination of water and glycerol as a second fluid medium gave the similar results.
iii) Mechanical properties of the film prepared using the coating composition prepared in accordance with the present disclosure.
The mechanical properties were performed on the cured films of the coating composition of the present disclosure and the silica acrylic hybrid clear coat (control1) to demonstrate the effect of the dendrimer polyol (polycarbonate dendrimer polyol)(Quickstar 384x).
The so obtained cured films of the coating composition of the present disclosure and the commercial premium quality emulsion paint films (comparative example 1) were subjected for the evaluation of the mechanical properties. Table 4 illustrates the effect of dendrimer polyol (polycarbonate dendrimer polyol) (Quickstar 384x) on the mechanical properties of the films.
Table 4: Effect of dendrimer polyol (polycarbonate dendrimer polyol) (Quickstar 384x) on the mechanical properties of the film prepared using the coating composition.
Sr.No. Experiment Description of the experiment Tensile strength (mPa), when measured as per ASTM D 2370 standard Elongation (%), when measured as per ASTM D 2370 standard
1 Exp-1
(In accordance with the present disclosure) 40% colloidal silica without dendrimer polyol
(Quickstar 384x) 21.5 354
2 Exp-2
(In accordance with the present disclosure) 50% colloidal silica with dendrimer polyol
(Quickstar 384x) 14.5 425
3 Control 1
Commercial silica acrylic hybrid clear coat procured from market 2.93 4.02
From table 4, it is evident that the dendrimer polyol enables even 50% hydrophilicity agent (colloidal silica) incorporation with very good flexibility.
iv) Weathering studies and film cracking resistance of the films prepared using the coating composition prepared in accordance with the present disclosure.
The test panels were exposed to the QUV B test conditions to assess the film cracking resistance of the coating composition prepared in accordance with the present disclosure.
The test panels were exposed to accelerated UV light exposure test with the light average / peak wavelength 313 nm. The results of the cracking resistance of the coating composition prepared in accordance with the present disclosure are demonstrated in table 5.
Table 5: Weathering studies and film cracking resistance of the films prepared using the coating composition:
Sr.No. Experiment Initial Sheen at 60 ° , when measured as per ASTM D 523 standard Sheen at 60 °After 408 hours QUV B exposure, when measured as per ASTM D 523 standard Cracking Observation
1 Exp-1 comprising 1 % coupling agent
(In accordance with the present disclosure) 25.2 21.7 no cracks
2 Exp-2 comprising 1 % coupling agent
(In accordance with the present disclosure) 17.4 6.9 no cracks
3 Control 1
(Commercial silica acrylic hybrid clear coat procured from market) 47.8 40.3 no cracks
Table 5: Cracking resistance of the coating composition of the present disclosure assessed by the QUV B exposure weathering studies
From table 5 it is evident that the presence of coupling agent in an amount of at least 1% eliminates the crack formation.
Figure 1 illustrates test panels that demonstrate the crack resistance and sheen retention.
From figures 1 (a to b) and figures 1 (e to f) it is confirmed that the crack was observed in the test panels coated with a coating composition comprising less than 1% coupling agent (which is not in accordance with the present disclosure); whereas from figures 1 (c to d) and figures 1 (g to h) it is confirmed that the test panels coated with a coating composition comprising at least 1% coupling agent (which is in accordance with the present disclosure) were crack free.
v) Evaluation of streak resistance of the films prepared using the coating composition prepared in accordance with the present disclosure.
To evaluate the streak resistance, the cement composite test panels were sprinkled with the measured amount (5gms of mix dust consisting 75 parts of natural dust: 25 parts of carbon black pigment called pigment black 7 /sq.ft) of mixture of the dust (collected from the natural dust accumulated on the terrace and carbon black pigment) to obtain the dust adhered test panels. Water was sprinkled on the so obtained dust adhered test panels to remove/clean the dust and to check if there were streak marks observed during the dust cleaning.
Figures 2 to 3 illustrate test panels that demonstrate the streak resistance.
From figure 2 (a) (test panel coated with only premium emulsion paint (control) it was observed that streaks marks were visible; whereas from figure 2 (b) (test panels coated with the coating composition of experiment no.1 of the present disclosure over the premium emulsion paint coat) it was evident that no streak marks were observed in the test panels coated with the coating composition of the present disclosure.
From figure 3 (a) (test panel coated with only premium emulsion paint (control)) it was observed that streaks marks were visible; whereas from figure 3 (b) (test panels coated with the coating composition of experiment no. 2 of the present disclosure over the premium emulsion paint coat) it was evident that no streak marks were visible in the test panels coated with the coating composition of the present disclosure.
vi) Dirt pick up resistant of the coating composition prepared in accordance with the present disclosure.

a. Dirt pick up resistant after 2 years natural exposure of the cement composite test panels coated with the coating composition prepared in accordance with the present disclosure:
For the evaluation of the dirt pick resistance, the cement composite test panels were kept on terrace on a metal framed cabinet at 45° angle facing south.
Figure 4 and 5 illustrates test panels demonstrating the dirt pick up resistant (DPUR) performance after 1 year natural exposure.
From figure 4 (b) it is observed that the test panel coated with the coating composition of experiment 1 (comprising 40% silica) of the present disclosure demonstrated best dirt pick up resistance and sustained dirt pick up resistance as compared to Figure 4 (a) (test panel coated with exterior premium emulsion paint only (control)) and figure 4 (c) (test panel coated with commercial silica acrylic hybrid clear coat procured from market (control 1)).
From figure 5 (b) it is observed that the cement composite test panel coated with the coating composition of experiment 2 (comprising 50% silica) of the present disclosure demonstrated best dirt pick up resistance and sustained dirt pick up resistance as compared to Figure 5 (a) (test panel coated with exterior premium emulsion paint only (control)) and figure 5 (c) (test panel coated with commercial silica acrylic hybrid clear coat procured from market (control 1)).
b. Dirt pick up resistance study on actual test wall:
The dirt pick up resistance study was performed on actual test wall. So actual test walls were prepared for performing the DPUR study.
The first coat of exterior premium emulsion paint was applied on the test wall at Turbhe, Navi Mumbai (MH) India, to obtain a test wall coated with the first coat. After 4 hours a second coat of exterior premium emulsion paint was applied on the test wall coated with the first coat to obtain a test wall coated with the second coat. The so obtained test wall coated with the second coat was coated with a coat of the coating composition obtained in the experiment 1 of the present disclosure to obtain the actual test wall.
The actual test wall was subjected for DPUR study. The DPUR study was performed by allowing the actual test wall to get exposed to natural weathering for 10 months. The actual test wall was having the vertical and horizontal areas which can be observed for the relative dirt accumulation over time. ¬¬¬¬¬¬¬¬
¬¬¬¬¬¬¬Figure 6 illustrates test walls demonstrating the horizontal dirt pick up resistant (DPUR) performance after natural exposure of 10 months including one full monsoon.
Typically the horizontal areas are more prone to dirt accumulation hence this give accelerated test condition to discriminate the performances. Generally, the coatings showing better dirt pick up resistance performance are supposed to be good in terms of the streak resistance as well due to lower dirt that will be running on the wall when first showering of monsoon happens.
From figure 6(b) it was observed that the actual test wall coated with the coating composition of experiment 1 of the present disclosure over the exterior premium emulsion paint had better dirt pick up resistance as compared to figure 6(a) (test wall coated with only exterior premium emulsion paint (control)) and figure 6(c) (test wall coated with silica acrylic hybrid clear coat (control 1)).
Figure 7 illustrates test walls demonstrating the vertical dirt pick up resistant (DPUR) performance after natural exposure of 10 months including one full monsoon.
The vertical area of the actual test wall simulates the condition prevalent and relatively show low dirt accumulation compared to the horizontal area of the test walls.
From figure 7(b) it is observed that the actual test wall coated with the coating composition of experiment 1 of the present disclosure over the exterior premium emulsion paint had very low dirt accumulation as compared to the figure 7(a) (test wall coated with only exterior premium emulsion paint (control)) and figure 7(c) (test wall coated with silica acrylic hybrid clear coat (control 1)).
TECHNICAL ADVANCES AND ECONOMIC SIGNIFICANCE
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of:
? a coating composition, that;
• has enhanced streak resistance;
• has enhanced dirt pick up resistance (DPUR);
• has a good balance of % elongation and tensile strength even at a high level of silica content (50%);
• is suitable for a variety of architectural surfaces such as masonry, brick, cement plaster, wood, painted surfaces, and the like;
• is optically neutral;
• has improved crack resistance and flexibility; and
• has a high hydrophilicity.
and
? a process for preparing the coating composition, that is;
• simple;
• economical; and
• environment friendly.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results. While certain embodiments of the inventions have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Variations or modifications to the formulation of this invention, within the scope of the invention, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this invention.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation. ,CLAIMS:WE CLAIM:
1. A coating composition comprising:
• a biocide dispersion of:
? at least one first dendrimer polyol;
? at least one algicide; and
? at least one first fluid medium;
• at least one polyurethane dispersion;
• carbon nanotubes;
• at least one coupling agent;
• at least one wetting agent;
• at least one hydrophilicity agent; and
• at least one second fluid medium.
2. The composition as claimed in claim 1, wherein:
• said biocide dispersion is present in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of said composition;
• said polyurethane dispersion is present in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of said composition;
• said carbon nanotubes are present in an amount in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of said composition;
• said coupling agent is present in an amount in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of said composition;
• said wetting agent is present in an amount in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of said composition;
• said hydrophilicity agent is present in an amount in the range of 25 mass% to 55 mass% with respect to the total mass of said composition; and
• at least one second fluid medium is present in an amount in the range of 10 mass% to 20 mass% with respect to the total mass of said composition.
3. The composition as claimed in claim 1, wherein said composition comprises a second dendrimer polyol in an amount in the range of 0 mass% to 5 mass% with respect to the total mass of said composition.
4. The composition as claimed in claim 1, wherein said composition comprises:
• a light stabilizer in an amount in the range of 0 mass% to 1 mass% with respect to the total mass of said composition; and
• a UV absorber in an amount in the range of 0 mass% to 2 mass% with respect to the total mass of said composition.
5. The composition as claimed in claim 1, wherein said biocide dispersion comprises:
• said first dendrimer polyol in an amount in the range of 20 mass% to 50 mass% with respect to the total mass of said biocide dispersion;
• said algicide in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of said biocide dispersion; and
• said first fluid medium in an amount in the range of 50 mass% to 78 mass% with respect to the total mass of said biocide dispersion.
6. The composition as claimed in claim 1, wherein said first dendrimer polyol and said second dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol, and combinations thereof.
7. The composition as claimed in claim 1, wherein said algicide is at least one selected from the group consisting of 3-(3,4-dichlorophenyl)-1,1-dimethylurea, iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones, and combinations thereof.
8. The composition as claimed in claim 1, wherein said first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, diacetone alcohol and combinations thereof.
9. The composition as claimed in claim 1, wherein said biocide dispersion comprises:
• polycarbonate dendrimer polyol as a first dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of said biocide dispersion;
• 3-(3,4-dichlorophenyl)-1,1-dimethylurea as an algicide in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of said biocide dispersion; and
• acetone as a first fluid medium in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of said biocide dispersion.
10. The composition as claimed in claim 1, wherein said polyurethane dispersion is selected from water based polyurethane dispersion, anionic aliphatic polyurethane dispersion, cyclo-aliphatic polyurethane dispersions, and combinations thereof.
11. The composition as claimed in claim 1, wherein said coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy functional silane oligomer, epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups, epoxy functional silane oligomer, and combinations thereof.
12. The composition as claimed in claim 1, wherein said wetting agent is an anionic fluorosurfactant.
13. The composition as claimed in claim 1, wherein said hydrophilicity agent is at least one selected from the group consisting of colloidal silica, alumina, quartz, a combination of colloidal silica and alumina, a combination of colloidal silica and quartz and a combination of alumina and quartz.
14. The composition as claimed in claim 1, wherein said second fluid medium is at least one selected from the group consisting of water, glycol and a combination of water and glycol.
15. The composition as claimed in claim 1, wherein said composition comprises:
• said biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of said composition;
• water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of said composition;
• carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of said composition;
• epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of said composition;
• anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of said composition;
• colloidal silica as a hydrophilicity agent in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of said composition; and
• water as a second fluid medium in an amount in the range of 11 mass% to 18 mass% with respect to the total mass of said composition.
16. The composition as claimed in claim 1, wherein said composition comprises:
• said biocide dispersion in an amount in the range of 2 mass% to 8 mass% with respect to the total mass of said composition;
• water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of said composition;
• carbon nanotubes in an amount in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of said composition;
• epoxy silane as a coupling agent in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of said composition;
• anionic fluorosurfactant as a wetting agent in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of said composition;
• colloidal silica as a hydrophilicity agent in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of said composition; and
• water as a second fluid medium in an amount in the range of 12 mass% to 16 mass% with respect to the total mass of said composition.
17. A process for the preparation of a coating composition, said process comprising the following steps:
a. mixing a predetermined amount of at least one first dendrimer polyol and a predetermined amount of at least one algicide under stirring at a first predetermined speed for a first predetermined time period to obtain a first mixture;
b. adding a first fluid medium to said first mixture under stirring at a second predetermined speed for a second predetermined time period to obtain a biocide dispersion;
c. mixing said biocide dispersion and a homogeneous polyurethane dispersion under stirring at a third predetermined speed for a third predetermined time period to obtain a second mixture;
d. adding predetermined amounts of carbon nanotubes, at least one coupling agent, at least one wetting agent into said second mixture under stirring at a fourth predetermined speed for a fourth predetermined time period to obtain a third mixture;
e. adding a predetermined amount of at least one hydrophilicity agent into said third mixture followed by lowering the stirring speed in the range of 200 rpm to 500 rpm to obtain a fourth mixture; and
f. mixing a second fluid medium with said fourth mixture to obtain said coating composition.
18. The process as claimed in claim 17, wherein said predetermined amount of said first dendrimer polyol is in the range of 20 mass% to 50 mass% with respect to the total mass of said biocide dispersion.
19. The process as claimed in claim 17, wherein said first dendrimer polyol is at least one selected from the group consisting of polycarbonate dendrimer polyol, polyester dendrimer polyol, and combinations thereof.
20. The process as claimed in claim 17, wherein said first dendrimer polyol is polycarbonate dendrimer polyol in an amount in the range of 25 mass% to 40 mass% with respect to the total mass of said biocide dispersion.
21. The process as claimed in claim 17, wherein said predetermined amount of said algicide is in the range of 2 mass% to 8 mass% with respect to the total mass of said biocide dispersion.
22. The process as claimed in claim 17, wherein said algicide is at least one selected from the group consisting of 3-(3,4-dichlorophenyl)-1,1-dimethylurea, iodopropynyl butylcarbamate, 2-n-octyl-4-isothiazolin-3-ones, and combinations thereof.
23. The process as claimed in claim 17, wherein said algicide is 3-(3,4-dichlorophenyl)-1,1-dimethylurea in an amount in the range of 3 mass% to 6 mass% with respect to the total mass of said biocide dispersion.
24. The process as claimed in claim 17, wherein
• said first predetermined speed is in the range of 250 rpm to 500 rpm; and
• said first predetermined time period is in the range of 2 minutes to 20 minutes.
25. The process as claimed in claim 24, wherein
• said first predetermined speed is in the range of 230 rpm to 400 rpm; and
• said first predetermined time period is 3 minutes to 10 minutes.
26. The process as claimed in claim 17, wherein said first fluid medium is at least one selected from the group consisting of acetone, methyl ethyl ketone, diacetone alcohol and combinations thereof.
27. The process as claimed in claim 17, wherein said predetermined amount of said first fluid medium is in the range of 50 mass% to 78 mass% with respect to the total amount of said biocide dispersion.
28. The process as claimed in claim 27, wherein said first fluid medium is acetone in an amount in the range of 55 mass% to 70 mass% with respect to the total mass of said biocide dispersion.
29. The process as claimed in claim 17, wherein
• said second predetermined speed is in the range of 250 rpm to 500 rpm; and
• said second predetermined time period is in the range of 5 minutes to 25 minutes.
30. The process as claimed in claim 29, wherein
• said second predetermined speed is in the range of 300 rpm to 500 rpm; and
• said second predetermined time period is 10 minutes to 20 minutes.
31. The process as claimed in claim 17, wherein said predetermined amount of said polyurethane dispersion is in the range of 25 mass% to 55 mass% with respect to the total mass of said composition.
32. The process as claimed in claim 17, wherein said homogeneous polyurethane dispersion is selected from water based polyurethane dispersion, anionic aliphatic polyurethane dispersion, cyclo-aliphatic polyurethane dispersions, and combinations thereof.
33. The process as claimed in claim 17, wherein said polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of said composition.
34. The process as claimed in claim 19, wherein said polyurethane dispersion is water based polyurethane dispersion in an amount in the range of 33 mass% to 48 mass% with respect to the total mass of said composition.
35. The process as claimed in claim 17, wherein
• said third predetermined speed is in the range of 500 rpm to 1000 rpm; and
• said third predetermined time period is in the range of 5 minutes to 25 minutes.
36. The process as claimed in claim 35, wherein
• said third predetermined speed is in the range of 600 rpm to 800 rpm; and
• said third predetermined time period is in the range of 7 minutes to 20 minutes.
37. The process as claimed in claim 17, wherein said predetermined amount of said carbon nanotubes is in the range of 0.1 mass% to 0.5 mass% with respect to the total mass of said composition.
38. The process as claimed in claim 37, wherein said predetermined amount of said carbon nanotubes in the range of 0.1 mass% to 0.4 mass% with respect to the total mass of said composition.
39. The process as claimed in claim 19, wherein said predetermined amount of said coupling agent is in the range of 0.5 mass% to 1.5 mass% with respect to the total mass of said composition.
40. The process as claimed in claim 19, wherein said coupling agent is at least one selected from the group consisting of silane, alkoxysilane, epoxy functional silane oligomer, epoxy silane bearing polyfunctional structure bearing gamma-glycidoxy groups, epoxy functional silane oligomer, and combinations thereof.
41. The process as claimed in claim 17, wherein said coupling agent is epoxy silane in an amount in the range of 0.7 mass% to 1.3 mass% with respect to the total mass of said composition.
42. The process as claimed in claim 17, wherein said predetermined amount of said wetting agent is in the range of 0.05 mass% to 0.2 mass% with respect to the total mass of said composition.
43. The process as claimed in claim 17, wherein said wetting agent is an anionic fluorosurfactant.
44. The process as claimed in claim 17, wherein said wetting agent is anionic fluorosurfactant in an amount in the range of 0.09 mass% to 0.18 mass% with respect to the total mass of said composition.
45. The process as claimed in claim 17, wherein
• said fourth predetermined speed is in the range of 500 rpm to 1000 rpm; and
• said fourth predetermined time period is in the range of 3 minutes to 15 minutes.
46. The process as claimed in claim 45, wherein
• said fourth predetermined speed is in the range of 600 rpm to 900 rpm; and
• said fourth predetermined time period is in the range of 3 minutes to 10 minutes.
47. The process as claimed in claim 17, wherein said predetermined amount of said hydrophilicity agent is in the range of 25 mass% to 55 mass% with respect to the total mass of said composition.
48. The process as claimed in claim 17, wherein said hydrophilicity agent is at least one selected from the group consisting of colloidal silica, alumina quartz, a combination of colloidal silica and alumina, a combination of colloidal silica and quartz and a combination of alumina and quartz.
49. The process as claimed in claim 17, wherein said hydrophilicity agent is colloidal silica in an amount in the range of 30 mass% to 50 mass% with respect to the total mass of said composition.
50. The process as claimed in claim 17, wherein said hydrophilicity agent is colloidal silica in an amount in the range of 33 mass% to 47 mass% with respect to the total mass of said composition.
51. The process as claimed in claim 17, wherein said predetermined amount of said second fluid medium is in the range of 10 mass% to 20 mass% with respect to the total amount of said composition.
52. The process as claimed in claim 17, wherein said second fluid medium is at least one selected from the group consisting of water, glycol and a combination of water and glycol.
53. The process as claimed in claim 17, wherein said second fluid medium is water in an amount in the range of 11 mass% to 18 mass% with respect to the total amount of said composition.
54. The process as claimed in claim 17, wherein said second fluid medium is water in an amount in the range of 12 mass% to 16 mass% with respect to the total amount of said composition.
55. A film made using the composition as claimed in claim 1, said film is characterized by having:
• elongation in the range of 300 % to 500%, when measured as per ASTM D 2370 standard;
• tensile strength in the range of 10 mPa to 30 mPa%, when measured as per ASTM D 2370 standard; and
• sheen @ 60 degree in the range of 10 GU to 30 GU, , when measured as per ASTM D 523 standard,
wherein said film has a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017).
56. The film as claimed in claim 55, said film is characterized by having:
• elongation in the range of 320 % to 480%%, when measured as per ASTM D 2370 standard;
• tensile strength in the range of 11 mPa to 25 mPa%, when measured as per ASTM D 2370 standard; and
• sheen @ 60 degree in the range of 12 GU to 28 GU, , when measured as per ASTM D 523 standard,
wherein said film has a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017).
57. The film as claimed in claim 55, said film is characterized by having:
• elongation in the range of 330% to 450%%, when measured as per ASTM D 2370 standard;
• tensile strength in the range of 12 mPa to 22 mPa%, when measured as per ASTM D 2370 standard; and
• sheen @ 60 degree in the range of 15 GU to 27 GU sheen @ 60 degree, when measured as per ASTM D 523 standard,
wherein said film has a thickness in the range of 20 microns to 50 microns, when measured as per ASTM D6132-13(2017).

Dated this 31st day of March, 2023

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
of R.K.DEWAN & CO.
Authorized Agent of Applicant

TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, AT MUMBAI