FIELD OF THE INVENTION
[001] The present invention relates to a waterproof putty composition and a method of
producing the waterproof putty composition. DESCRIPTION OF THE BACKGROUND ART
[002] Putty or skim coat refers to a white cement-based coating material used for building structures. It is white cement based fine powder which provides an ideal finishing for concrete/cement plastered walls and ceiling surface. Putty is generally made up of base-material like cement, filler & different polymers and etc. It provides an ideal base for painting. Also it is a high grade quality based RD polymers, and high cement content to provide excellent durability along with smoothing and filling properties to minor holes/pores & cracks at wall surface.
[003] Typical putty composition mainly includes white cement, different polymers, dolomite & calcite. Putty is usually applied on inner and outer walls/surfaces and a ceiling of a building. After the application, the putty coating is not cured & coated with paint as a finishing.
[004] The demand for wall putty is always on the higher side due to its heavy consumption before painting. As the construction work and industrialization is our country is being done in rapid strides, this eventually leads to higher consumption of putty. In future, the constructions and industrial buildings, etc. are likely to increase tremendously as a result the demand will increase simultaneously.
[005] Conventionally, various resins such as polyurethane, polyacrylic, polyepoxy, and polyurea have been used to prepare waterproof coatings for the different wall/surfaces.
[006] However, there is a problem that the polyurethane coating film has a high elasticity, but the strength is inferior enough to make the durability unsatisfactory. Therefore, in the case of the structure, the structure is detached due to aging or the waterproofing

property of the polyurethane film when cracks occur due to corrosion of the cement component It is not suitable as a waterproof coating film for durability in spite of good workability and economic efficiency.
[007] In addition, polyacrylic or polyepoxy coatings are known to be unsatisfactory for waterproofing applications in buildings where strength is high but elasticity is low and cracks and structural separation are likely to occur.
[008] A number of attempts were made to prepare a waterproof putty composition. KR patent application KR200928065, discloses a polymer-modified mortar composition used for waterproof coating during construction which is based on ethylene vinyl acetate copolymer and/or styrene acrylic copolymer.
[009] KR patent application KR20190030917A provides a waterproof putty composition comprising an environmentally water-dispersible acrylic urethane emulsion, a process for preparing the same, and a putty application method using the same.
[010] CN102220043A provides a water-resistant putty for interior wall comprising the following components in parts by weight: 700 parts of coarse whiting, 250 parts of ash-calcium, 6 parts of mirror adhesive powder, 1 part of poly(vinyl alcohol) powder, 3 parts of hydroxy ethyl cellulose and 0.3 part of modified starch ether.
[011] CN1414041A provides a water-proof putty for internal and external walls is prepared from modified starch, carboxymethyl cellulose, sierozem powder, propenol and heavy calcium carbonate, through proportioning, drying, grinding and stirring.
[012] United States Patent 9988566 provides a hydrophobic silicone-based putty composition comprising; a silicone fluid in a concentration of 10 to 30% by weight; an anti-blocking agent in a concentration of 1 to 18% by weight; and a rheological additive in a concentration of 0.1 to 2% by weight, and a filler in a concentration of 60 to 80% by weight.

[013] However, there is a need of a cement based putty composition which has excellent
water resistance or water repelling property which solves some of the major problems
present in the prior art as mentioned above. OBJECT OF THE INVENTION [014] Accordingly, a first object of the present invention is to provide a waterproof putty
composition having excellent waterproofness, adhesiveness, tensile strength as well as
good workability & water retentivity properties. [015] A second object of the present invention is to provide a method for effectively
manufacturing a waterproof putty composition. SUMMARY OF THE INVENTION [016] In as aspect, the present invention provides a putty composition comprising by weight
of the composition
a) 13-18 % of cement/cementitious pozzolanic material;
b) 0.5-2% of vinyl acetate, ethylene copolymer;
c) 1-6% of ethylene, vinyl chloride, vinyl laurate terpolymer;
d) 0.4-0.6 % of methyl hydroxy ethyl cellulose;
e) 60-70% of filler;
f) 2-5.0% of calcite;
g) 0.2-0.6 % of silane/silicon based silres P; and h) 2-5 % of calcium/zinc/magnesium stearate.
DETAILED DESCRIPTION OF THE INVENTION
[017] The invention summarized above and defined by the enumerated claims may be better understood by referring to the following description, which should be read in conjunction with the accompanying claims. This description of an embodiment, set out below to enable one to build and use an implementation of the invention, is not intended to limit the invention, but to serve as a particular example thereof. Those

skilled in the art should appreciate that they may readily use the conception and specific embodiments disclosed as a basis for modifying or designing other methods and systems for carrying out the same purposes of the present invention.
[018] It is to be noted that, as used in the specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a composition containing "a compound" includes a mixture of two or more compounds. It should also be noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
[019] The expression of various quantities in terms of "%" or "% w/w" means the percentage by weight, relative to the weight of the total solution or composition unless otherwise specified.
[020] The term "putty or skim coat" refers to a white cement-based polymer modified coating material used for building structures applied over different wall/surfaces to provides longer durability to paint.
[021] The term "filler" used in reference are by products of cement industry which helps in controlling the final finish of the skim coat composition and is responsible for its unique natural bright & white color.
[022] According to an embodiment of the present invention, there is provided a putty composition for coating walls. The putty composition shows very high degree of water resistance properties to wall/surfaces which aids in preventing attack of water from both sides of wall/surfaces as well as growth of molds and extending the durability of the coating.
[023] The composition comprising, by weight of the composition,
a) 13-18 % of cement/cementitious pozzolanic material;
b) 0.5-2% of vinyl acetate, ethylene copolymer;

c) 1-6% of ethylene, vinyl chloride, vinyl laurate terpolymer;
d) 0.4-0.6 % of methyl hydroxy ethyl cellulose;
e) 60-70% of filler;
f) 2-5.0%ofcalcite-10;
g) 0.2-0.6 % of silane/silicon based silres P; and h) 2-5 % of calcium/zinc/magnesium stearate.
[024] In an embodiment, the said composition comprises cementitious material which plays the role of an inorganic hydraulic binder providing strength and rigidity to the skim coat. It helps in adherence of the skim coat once applied to the wall surface. Preferably, the cementitious material is white cement which is present in the range of 13-18 %, by weight of the composition.
[025] According to an embodiment, the said composition comprises of vinyl acetate ethylene co-polymer. Preferably, the vinyl acetate ethylene co-polymer is present in the range of 0.5-2%, by weight of the composition. The vinyl acetate ethylene co-polymer is an organic re-dispersible powder binder which imparts flexibility, breathability, tensile adhesive properties and abrasion resistance properties to the skim coat. This results in the skim coat composition to be more adhesive towards the wall/surfaces and hence there is no cracking of the paint.
[026] In an embodiment, the putty composition comprises of ethylene, vinyl chloride, vinyl laurate terpolymer in the range of 1-6 % by weight of the composition. The terpolymer functions as an organic binder to provide excellent hydrophobicity contributing to binding along with vinyl acetate, ethylene copolymer.
[027] In an embodiment, the composition comprises of methyl hydroxy ethyl cellulose which provides workability to the skim coat composition thereby improving the ease and smoothness of working with the skim coat dry mix during its application. Additionally, the methyl hydroxyl ethyl cellulose has hydroxyl group present in it

which contributes to water retention property of the present skim coat composition thereby avoiding the need to cure the plastered wall after application of the skim coat. This cuts down on a process step and leads to saving of water as well as time. Preferably, the methyl hydroxy ethyl cellulose is present in the range of 0.4-0.6 %, by weight of the composition.
[028] In another embodiment, the skim coat composition comprises of mineral filler. In an embodiment, the mineral filler is selected from the group consisting of dolomite, hydrated lime & calcite. The mineral filler fills in all the pores of the walls and ceiling and provides a white, smooth and dry surface for painting and contributes to increasing the life of the painted surface. Preferably, the mineral filler is present in the range of 60-70%, by weight of the composition.
[029] In an embodiment, the putty composition comprises of a whiteness enhancer in the range of 2-5.0 % by weight of the composition. Preferably, the whiteness enhancing agent can be selected from calcite-10 micron, rutile, anatase.
[030] Preferably, finer particles of whiteness enhancer are used in the skim coat composition wherein the size of the calcite particles is 10-15 microns. Due to the smooth wall/surface finish, paint is not lost in uneven surface areas or undulations on the wall/surface thereby decreasing the volume of paint required for painting on the skim coated wall; thereby further reducing the costs to the customer. Additionally, the high whiteness of the wall surface results in solar thermal infrared (IR) reflectivity. It is a known phenomenon that products utilizing reflective technology are likely to have a longer service life because of the lower surface temperatures which in turn lessen the chemical and atmospheric degradation and also lessen the expansion and contraction. The lower surface temperature will also keep the interiors of the house cooler during hot days.

[031] In an embodiment, the skim coat composition comprises of a silane/silicon based hydrophobic polymer in the range of 0.2-0.6 % by weight of the composition. The silane/silicon based hydrophobic polymer is selected from group consisting of 50-60% active content of silane/silicon polymer.
[032] This water proof putty formulation designed, with a high active content unique silane/silicon based polymer having properties of excellent hydrophobicity & similar technical properties of skim coat/putty. The use of silane/silicon base polymer is not only gives water proof property at the time of putty application as well as its improved quality of putty in terms of tensile adhesion strength which was not before use in normal putty.
[033] The base composition of the present invention has silane based polymer & terpoymer substance to achieve water proof property in the putty. Water proof putty provides water proof property due to its high active content in silane polymer. All the above compositions are finally consolidated with putty contents.
[034] Silane based polymer & white cement hydraulic binder are inorganic in nature which gives water proof property and provides hard binding and rigidity to the final coat respectively. Whereas all polymer binders provide have specific function to play and impart various properties to the above mix as described above.
[035] In an embodiment, the components of the skim coat composition are dry mixed in their specific proportions to yield a dry mix composition which only needs to be reconstituted with a specific amount of water, by the user, at the time of skim coating a plastered wall surface. The components are mixed at an ambient temperature and pressure. It makes the product an easy-to-use and do-it-yourself skim coat composition, obviating the need for skilled workmen to do the work of skim coating prior to painting. Also, the high costs associated with using acrylic polymer or POP based skim coats for plastering walls are overcome.

[036] The putty composition further comprising of a hydrophobicity enhancing agent in the range of 2-5 %, by weight of the composition. In an embodiment, the third hydrophobicity enhancing agent is selected from group consisting of aluminum stearate, magnesium stearate, zinc stearate or calcium stearate. These type of hydrophobic materials coat the skim coat product materials & doesn't allow to penetrate water inside it.
WORKING EXAMPLES
EXAMPLE 1:
[037] 90 g of white cement was mixed with 858.3 g of dolomite & 30g calcite, by weight of the composition. To this dry mix, 1 g of vinyl acetate ethylene copolymer, 1.2 g of methyl hydroxyl ethyl cellulose, were added, 13g of hydrophobic polymer, vinyl acetate, ethylene and vinyl ester of versatic acid, 0.5g of Silers P & 6g of Calcium Stearate by weight of the composition. This dry mix was reconstituted in water and the paste was coated on the walls prior to painting.
EXAMPLE 2:
[038] 120 g of white cement was mixed with 779.6 g of dolomite & 60g calcite, by weight of the composition. To this dry mix, 2 g of vinyl acetate ethylene copolymer, 2.4 g of methyl hydroxyl ethyl cellulose, were added, 23g of hydrophobic polymer, vinyl acetate, ethylene and vinyl ester of versatic acid, lg of Silers P & 12g of Calcium Stearate by weight of the composition. This dry mix was reconstituted in water and the paste was coated on the walls prior to painting.
EXAMPLE 3:

[039] 150 g of white cement was mixed with 698.7 g of dolomite & 90g calcite, by weight of the composition. To this dry mix, 5 g of vinyl acetate ethylene copolymer, 3.8 g of methyl hydroxyl ethyl cellulose, were added, 33g of hydrophobic polymer, vinyl acetate, ethylene and vinyl ester of versatic acid, 2g of Silers P & 17.5g of Calcium Stearate by weight of the composition. This dry mix was reconstituted in water and the paste was coated on the walls prior to painting.
Table 1 provides the properties of the water resistant putty composition of examples 1-3.

Parameter Name Of materials Example-1 Example-2 Example-3
% composition White Cement 9 12 15

Dolomite 85.83 77.96 69.87

Calcite 3 6 9

Hydrophobic polymer, vinyl acetate, ethylene and vinyl ester of versatic acid; 1.3 2.3 3.3

Silers P 0.05 0.1 0.2

Calcium Stearate 0.6 1.2 1.75

vinyl acetate ethylene copolymer, 0.1 0.2 0.5

Methyl Hydroxyl ethyl cellulose 0.12 0.24 0.38
Results Tensile Adhesion strength @ 28 Days (N/mm2) 0.8 0.9 1.04

Water Capillary absorption, 30 min, 28 days (ml) 0.1 0.07 0.04

Compressive Strength (N/mm2)@ 28 days 4.1 6.2 8.5

Water Retention 93.3 96.1 99.9
[040] The Cement contents (15%), vinyl acetate ethylene copolymer contents (0.5%), hydrophobic polymer, vinyl acetate, ethylene and vinyl ester of versatic acid (3.3%), Silers P (0.2%), Calcium Stearate (1.75%), MHEC contents (0.38%), Mineral Fillers like calcite, dolomite contents (approx. 78.87%) are used The outcomes are as under
[041] Below of are conclusions looking to table 1 in claim composition.

[042] There are three formulation examples were taken one is low range, others are medium
& high. [043] In Example 1, water capillary absorption (0.1) is higher and the adhesive strength was
lower as compared to Examples 2 and 3. Water retention ability of Example 1 was
also less than Examples 2 and 3. [044] The composition of example 3 exhibited better properties over Examples 1 and 2.
High hydrophobicity property of composition of Example 3 imparts very high water
resistant property to wall surface and prevents entry of moisture and water vapor.
Thus, the coating composition makes a surface more durable due to, high
hydrophobicity, high tensile adhesion strength & high water retention properties.
ADVANTAGES
1. Water proof putty composition has unique water proofing property which gives
protection from the leakage & seepage from both sides of wall inside & outside.
2. Water proof putty composition has excellent water resistant property and also supports wall breathability and better coverage of paint and allows water vapor from the wall to escape without causing damage to paint top coat.
3. No need of curing the composition after applying on surface with water due to water retention behavior.
4. Hydrophobic/water repelling properties prevents water ingression from both inside & outside the wall.

We Claim:
1) A water resistant putty composition comprising, by weight of the composition,
a) 13-18 % of cement/cementitious pozzolanic material;
b) 0.5-2% of vinyl acetate, ethylene copolymer;
c) 1-6% of ethylene, vinyl chloride, vinyl laurate terpolymer;
d) 0.4-0.6 % of methyl hydroxy ethyl cellulose;
e) 60-70% of filler;
f) 2-5.0 % of whiteness enhancer;
g) 0.2-0.6 % of silane/silicon based hydrophobic polymer; and
h) 2-5 % of hydrophobicity enhancing agent calcium/zinc/magnesium stearate.
2) The composition as claimed in claim 1, wherein said cementitious material is white cement.
3) The composition as claimed in claim 1, wherein said vinyl acetate ethylene co-polymer is an organic re-dispersible powder binder for imparting flexibility, breathability, tensile adhesive properties.
4) The composition as claimed in claim 1, wherein ethylene, vinyl chloride, vinyl laurate terpolymer imparts hydrophobicity.
5) The composition as claimed in claim 1, wherein said methyl hydroxy ethyl cellulose imparts workability to the composition.
6) The composition as claimed in claim 1, wherein said filler is selected from a group consisting of dolomite, hydrated lime & calcite.
7) The composition as claimed in claim 1, wherein said whiteness enhancer is selected from a group consisting of calcite, rutile and anatase, preferably calcite.
8) The composition as claimed in claim 7, wherein particle size of said calcite is in the range of 10-15 microns.
9) The composition as claimed in claim 1, wherein said silane/silicon based hydrophobic
polymer is silane/silicon based silres P.
10) The composition as claimed in claim 1, wherein said hydrophobicity enhancing agent is
selected from group consisting of aluminum stearate, magnesium stearate, zinc stearate or
calcium stearate.