Claims:We Claim:

1. Aqueous matting slurry/ dispersion comprising amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, oil based ethoxylate derivatives, and urea thickener adapted for universal effective matting of water based emulsion paint or solvent borne long oil alkyd paints.

2. Aqueous matting slurry/dispersion as claimed in claim 1 wherein said dispersion has a solid content of 15-25% suitable for dispensing via point of sale dispensing machine in having viscosity in the levels of viscosity range is 10-1 to 102 Pa.s for a shear rate range of 10-2 to 103 sec-1 at temperatures of 25 ?C for addition to either water based emulsion paint or solvent borne long oil alkyd paint to favour effective matting.

3. Aqueous matting slurry/ dispersion as claimed in claims 1 or 2 wherein said dispersion comprises
15-18 wt.% silicon dioxide that is amorphous;
3-6 wt.% Oxirane trimethylhexyl ether;
16-18 wt. % glycol; and
15-20 wt.% oil based ethoxylate derivatives.
1.2-2.5 wt.% Urea thickener

4. Aqueous matting slurry/ dispersion as claimed in claims 1-3 wherein said urea based thickener is selected from polyurethane modified having non-volatile matter 48-56.

5. Aqueous matting slurry/ dispersion as claimed in claims 1-4 wherein said glycol includes propylene glycol, Triethylene glycol, and, wherein said oil based ethoxylate derivatives includes Soya or Groundnut oil based ethoxylates or mixtures thereof having HLB 13-14; Iodine Value 20 – 25 and Hydroxyl Value, 110-120 mg KOH/g.

6. Aqueous matting slurry/ dispersion as claimed in claims 1-5 wherein said water based emulsion paint for effective matting in terms of stability/ sheen are selected from Acrylic Emulsion, NVM (non-volatile matter) 50-65, PVC (pigment volume concentration) 25-35; Vinyl Acrylic Emulsion, NVM 50-65, PVC 25-35; Styrene Acrylic Emulsion; NVM 50-65, PVC 25-35; and; wherein said solvent borne long oil alkyd paints for effective matting in terms of stability/ sheen are selected from long oil based alkyd, Gloss@20 deg> 80; NVM 40-70; PVC 30-40; Epoxy Based Gloss @60 deg-35-50 NVM -70-75; Polyurethane Gloss @20 deg >90; NVM -45-60

7. Aqueous matting slurry/dispersion as claimed in claims 1-6 wherein said water based emulsion paint could be effectively matted with sheen reduction in the levels of 8-25 units, and, solvent based paints could be effectively matted with sheen reduction in the levels of 20-110 units.
8. Aqueous matting slurry/dispersion as claimed in claims 1-7 wherein said dispersion is stable at 55 deg C for a month with natural stability of at least 1.5 years at ambient temperature at about 40 ?C and is compatible with said solvent borne resin based on mineral Turpentine, Xylene, and Butanol solvents causing desired matting along with the film performance.
9. A process for manufacturing said aqueous matting slurry/dispersion as claimed in claims 1-8 comprising the steps of
(i) providing amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, oil based ethoxylate derivatives, and urea thickener over premix and grinding stages;
(ii) processing in high-speed disperser at 2000 RPM at temperature between 25-40 deg Celsius to obtain therefrom said aqueous matting slurry/dispersion that is stable and adapted for universal effective matting of water based emulsion paint or solvent borne long oil alkyd paints.

10. A process for manufacturing of said aqueous matting slurry/dispersion as claimed in claim 9 wherein said step (i) involves sequence of addition of ingredients for said stability of the slurry with said glycol added in the premix forming stage formed with oxirane trimethylhexyl ether, oil based ethoxylate derivatives, water; and, said thickener being added after grinding of silicon dioxide.

Dated this the 11th day of October, 2021 Anjan Sen
Anjan Sen and Associates
(Applicants Agent)
IN/PA-199

, Description:FIELD OF INVENTION
The present invention provides for universal matting slurry for point of sale tinting at higher solids of 15-25% as sheen variant provided through one base for point of sale tinting/matting thereby allowing tinting through said universal slurry instead of providing number of product variants.
BACKGROUND ART
There are two types of paints used today, latex and alkyd. Alkyd paint is also known as oil-based paint. Latex provides an excellent finish, while being an easier paint to use. Latex paint cleans up with soap and water, dries quickly, has less odour, is non-flammable, easy to touch up, they remain more flexible and allow moisture to evaporate through the film thus reducing blistering, cracking and peeling.
Inexpensive latex paints use softer vinyl resins (binders) and more water in the formulation while the more durable of the latex paints use 100% acrylic resins and less water, (you only get what you pay for). The term "Enamel" is normally associated with paints that have some gloss to the finish. Enamels are formulated with higher concentrations of resin as they are intended to be subjected to more wear and tear.
The sheen of a paint is the amount of light reflected by the surface of a paint finish. There are four basic sheens: flat, satin, semi-gloss and gloss.
Flat Paints exhibit non-reflective properties providing a matte finish. This finish helps hide surface imperfections, and is normally used for ceilings and walls in areas not subjected to a lot of wear and tear, dining rooms, living rooms and bedrooms not used by small children.
Satin Finish also known as eggshell finish, provides a soft luster sheen similar to that of an eggshell. A satin finish provides a harder surface finish which is more durable and more stain resistant than a flat finish. This durability makes satin paint a good choice for walls in children's rooms, hallways, stairways and family rooms.
Semi-gloss Paints are very durable, they are easier to clean, and are more stain resistant than satin finish paints. Semi-gloss paints are most often used on heavy wear surfaces or areas that are frequently cleaned such as kitchens and bathrooms. Semi-gloss paint is also used on wood trim and cabinets.
Gloss Paint is a harder, more durable, more stain resistant paint finish. It is easier to clean than all the other paint finishes. Gloss finishes generally make surface imperfections more noticeable. Gloss finishes are the best choice for heavy wear areas like kitchens, bathrooms, furniture and cabinets, floors, stairs, handrails, high traffic doors and trim.
Matting is a property of coatings that delivers a smooth, subtle look and shows little-to-no sheen. Matting lowers the gloss/sheen by scattering the light in many directions leading to surface appearance less glossy.
In color theory, a tint is a mixture of a color with white, which increases lightness, while a shade is a mixture with black, which increases darkness. Both processes affect the resulting color mixture's relative saturation. A tone is produced either by mixing a color with grey, or by both tinting and shading.
Matt coatings are used to obtain a less glossy surface depending on the application. These coatings are widely used to coat substrates, such as wood, plastics, VCT, metals, etc.
There are several options to the coatings formulator to create a matt coating. Matting agents, such as silica, waxes and fillers are mixed with coatings and paints in order to impart a matt finish to the substrate. These include:
Matting agents when used with paints and coatings scatter the incoming light thus giving a matt effect to the desired surface. Moreover, the higher the dosing of matting agent in the paint, the stronger is the matting effect.
When a coating is applied to a substrate, the matting agent is uniformly distributed in the wet coating film. Upon the evaporation of solvents, they will extend beyond the film surface during the drying process due to film shrinkage, thus altering the film from a smooth and even glossy surface to a matt one.
This shrinkage is the main reason for creating (more or less) rough surface, or, in other words, a matted paint film. This shrinkage can vary from 30% to 60% of the wet film’s volume depending on the formulation’s volume solids.
Film surface micro-roughness is created by:
• Film shrinkage/volume reduction
• Size and number of matting agent particles
• Orientation of the particles
• State of dispersion
• Interactions with other components, e.g. surfactants, catalysts, etc.

It is important to note that conventional coatings are relatively easy to matt because the film shrinks upon hardening due to emissions, but solvent-free and 100% solid systems, such as radiation-curable coatings, powder coatings, etc. are difficult to matt.
Raw Materials to Achieve Matting in Paints and Coatings
Conventional silicas (precipitated and pyrogenic) are known to be highly effective in reducing the gloss of all kinds of systems including solvent as well as waterborne. The matting effect relies on the porous and uneven shape of the silica particles. When added in a sufficient quantity to a coating or ink, they will extend beyond the film surface when the film shrinks during the drying process, thus altering the film from a smooth and even glossy surface to a matt one.
In this backdrop there is no reference which provides formulation and process related to a stable universal matting slurry at higher solids which can be used on dispensation, and on which references are invited based on the following
SE501216C2 teaches aqueous suspensions of colloidal particles which particles are both silica based anionic particles and swollen particles of clays of smectite type which are expandable in water and a process for the preparation thereof. The suspensions are useful as flocculating agents and particularly in combination with polymers in the production of paper.
CN1328163C discloses an edge polishing composition for wafers, comprising water and silicon dioxide having an average particle size of from 70 to 2,500 nm.
GB2015490A teaches a method of rendering readily pumpable but stable an aqueous suspension of mineral particles such as whiting, kaolin or limestone, having a water content of not more than 40 per cent by weight, by incorporating an agent which acts in the presence of the solid particles to form a gel-like or thixotropic structure which inhibits settlement of the solids on standing but breaks down under gentle shear, and preferably also a dispersing agent capable of reducing the viscosity.
US3472459A is directed to a process for the treatment of finely divided synthetic silica in which the size of the primary particles is essentially below 0.1 nm and in which such primary particles are agglomerated to secondary particles with porous structure to produce a product adapted as a matting agent in lacquers which comprises subjecting said silica to a simultaneous combined grinding and air classifying process in which the portions of the agglomerates which have been reduced to a particle size between 1 and 20 µm are continuously removed from the grinding space in suspended state as they are formed and air classified to produce a product in which the particle size is essentially between 1 and 20 µm. and in which the finest fraction with a particle size of less than 1 µm is less than 25%.
Reference is also invited to CN112063250 that discloses paint prepared from a first component and a second component; wherein the first component comprises 30-50 parts of acrylic emulsion, 10-30 parts of polyurethane modified alkyd resin aq. dispersion, 1-4 parts of film forming aids, 0.1-0.6 part of wetting agent, 0.5-1.2 part of defoamer, 0.3-1 part of thickener, 0.5-2 part of matting agent, 20-30 parts of titanium dioxide slurry, 0.05-0.1 part of antiseptic preservative, and 2-18 parts of deionized water; and the second component includes a hydrophilic aliphatic polyisocyanate curing agent. Thus, 50 parts of acrylic emulsion and 10 parts of AKD 2734 (polyurethane-modified alkyd resin aq. dispersion) were dispersed to obtain a first mixture; next, 0.5 part of BYK 346 (wetting agent), 0.5 part of mixture of TEGO Foamex 810, BYK 024, TEGO Airex 902W (defoaming agent), and the first mixture were dispersed to obtain a second mixt.; thereafter, 2 parts of DPM and DPnB (film-forming aid) and deionized water were mixed to obtain a third mixture; and then, the obtained second mixt., third mixt., 0.6 part of mixt. of RHEOLATE HX 6008 and RHEOLATE 299 (thickener), 1.5 parts of SY 7000 (matting agent), 20 parts of titanium dioxide slurry, and 0.1 part of MBS (bactericidal preservative) were dispersed to obtain a first component; and then, the obtained first component and the second component were admixed to obtain the title white paint. Claim 5 therein teaches in said water-based matte white paint the film-forming assistant is at least one selected from diethylene glycol ethyl ether, diethylene glycol butyl ether, dipropylene glycol methyl ether and dipropylene glycol butyl ether. This prior art while teaches about polyurethane modified alkyd resin aqueous dispersion with a wetting agent, matting agent selected from silica, defoamer, titanium dioxide slurry etc. together with glycols as film forming assistant, does not teach the involvement of oxirane trimethylhexyl ether and ethoxylate derivatives to provide for universal matting slurry.
CN105504946 teaches prior slurry comprises (by wt. parts): fumed silica 15-20, organic solvent 50-75, dispersing aid 1-5, and surfactant 1-5. The slurry can be re-dissolved, and has good matting property. The generic ingredients of this prior art does not include the functional characteristics of the specific ingredients incorporated in the matting slurry of the present invention.
CN103555189 teaches a prior paint that consists of 1:0.8-1.2 a main paint and an isocyanate hardener in which the main paint is composed of benzene-free high-hydroxy short oil alkyd resin 40-55, benzene-free low viscosity short oil alkyd resin 10-25, a dispersant 0.1-0.3, an anti-settling slurry (containing alkyd resin, organic bentonite, hydrophobic fumed silica, and an environment-friendly mixed solvent including di-Me carbonate, basic aluminum chloride, propylene glycol Me ether acetate and mixt. of high b.p. solvent with dibasic acid ester) 2-5, aluminum powder 1-3, a wax powder 0.2-1, a matting agent 1-5, a defoamer 0.1-0.5, a leveling agent 0.05-0.3, a wetting agent 0.1-0.3, and the environment-friendly mixed solvent 15-30 parts.
CN107163700 teaches paint that comprises (by wt. parts): water 30-60, cellulose 0.5-1, antifreezing agent 0.1-0.15, film-forming aid 0.15-0.2, wetting agent 0.1-0.2, dispersant 0.8-1, defoamer 0.2-0.6, bactericide 0.01-0.02, titanium dioxide 0.5-1, kaolin 1-1.5, fumed silica 18-20, pH adjusting agent 0.05-1, water-based synthetic resin emulsion 30-35, protection liq. 30-40, leveling agent 0.5-0.8 and thickener 0.2-0.6. According to the requirement, at least two kinds of color pastes can be added in the same slurry. The paint avoids bleeding phenomenon, and can ensure multicolor stereo wallpaper-like appearance.
https://www.govinfo.gov/content/pkg/CFR-2019-title40-vol33/xml/CFR-2019-title40-vol 33 -part721.xml# seqnum 721.522 teaches Oxirane, methyl-, polymer with oxirane, mono (3,5,5,-trimethylhexyl) ether as a chemical substance and uses of the identified oxirane, methyl-, polymer with oxirane, mono (3,5,5,-trimethylhexyl) ether documented as:(i) Industrial, commercial, and consumer activities including use other than as a wetting agent, dispersing agent and defoaming/ deaerating agent in waterborne coatings, inks, and paints, water based adhesives, and ultraviolet curable coatings; wetting agent in water miscible metalworking fluids, powdered construction additives for use in cementitious mortars, grouts and tile adhesives, and in liquid admixtures for concrete; and a substrate wetting and anti-cratering additive for ultraviolet curable inkjet ink.
Inspite of the above state of the art knowledge on matting slurries there is a need in the art to explore for stable universal matting slurry at higher solid levels for point of sale tinting that would thus provide for sheen variants through one universal base slurry instead of providing number of product variants to enable effective matting for both solvent borne and water borne emulsion paints.

OBJECTS OF THE INVENTION
Thus the primary object of the present invention is to provide for stable aqueous matting slurry/ dispersion at higher solids, as universal matting slurry, for point of sale tinting that would enable sheen variance in paints by tinting through said universal slurry at the point of sale.
Another object of the present invention is to provide for said stable aqueous matting slurry/ dispersion which in behaving as universal slurry would avoid involving number of product variants.
Yet another object of the present invention is to provide for said stable aqueous matting slurry/ dispersion that would allow reduced inventory by having one high sheen product by providing variations in matt at differentiated price points.
Still another object of the present invention is to provide for said stable aqueous matting slurry/ dispersion to be used via point of sale dispensing machine, which in being universal in nature and when added to water based emulsion paint or solvent borne long oil alkyd paint compositions would be capable of effective matting of the same.
SUMMARY OF THE INVENTION
Thus according to the basic aspect of the present invention there is provided an aqueous matting slurry/ dispersion comprising amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, oil based ethoxylate derivatives, and urea thickener adapted for universal effective matting of water based emulsion paint or solvent borne long oil alkyd paints.
Preferably in said aqueous matting slurry/dispersion said dispersion has a solid content of 15-25% suitable for dispensing via point of sale dispensing machine in having viscosity in the levels of viscosity range is 10-1 to 102 Pa.s for a shear rate range of 10-2 to 103 sec-1 at temperatures of 25 ?C for addition to either water based emulsion paint or solvent borne long oil alkyd paint to favour effective matting.
According to another preferred aspect of the present invention there is provided an aqueous matting slurry/ dispersion wherein said dispersion comprises
15-18 wt.% silicon dioxide that is amorphous;
3-6 wt.% Oxirane trimethylhexyl ether;
16-18 wt. % glycol; and
15-20 wt.% oil based ethoxylate derivatives.
1.2-2.5 wt.% Urea thickener
Preferably said urea based thickener is selected from polyurethane modified having non-volatile matter 48-56.
According to yet another preferred aspect of the present invention there is provided said aqueous matting slurry/ dispersion wherein said glycol includes propylene glycol, Triethylene glycol, and, wherein said oil based ethoxylate derivatives includes Soya or Groundnut oil based ethoxylates or mixtures thereof having HLB 13-14; Iodine Value 20 – 25 and Hydroxyl Value, 110-120 mg KOH/g.
Preferably in said aqueous matting slurry/ dispersion said water based emulsion paint for effective matting in terms of stability/ sheen are selected from Acrylic Emulsion, NVM (non-volatile matter) 50-65, PVC (pigment volume concentration) 25-35; Vinyl Acrylic Emulsion, NVM 50-65, PVC 25-35; Styrene Acrylic Emulsion; NVM 50-65, PVC 25-35; and; wherein said solvent borne long oil alkyd paints for effective matting in terms of stability/ sheen are selected from long oil based alkyd, Gloss@20 deg> 80; NVM 40-70; PVC 30-40; Epoxy Based Gloss @60 deg-35-50 NVM -70-75; Polyurethane Gloss @20 deg >90; NVM -45-60
Advantageously, with said aqueous matting slurry/dispersion said water based emulsion paint could be effectively matted with sheen reduction in the levels of 8-25 units, and, solvent based paints could be effectively matted with sheen reduction in the levels of 20-110 units.
More advantageously said aqueous matting slurry/dispersion is stable at 55 deg C for a month with natural stability of at least 1.5 years at ambient temperature of about 40 ?C and is compatible with said solvent borne resin based on mineral Turpentine, Xylene, and Butanol solvents causing desired matting along with the film performance.
According to another aspect of the present invention there is provided a process for manufacturing said aqueous matting slurry/dispersion comprising the steps of
(i) providing amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, oil based ethoxylate derivatives, and urea thickener over premix and grinding stages;
(ii) processing in high-speed disperser at 2000 RPM at temperature between 25-40 deg Celsius to obtain therefrom said aqueous matting slurry/dispersion that is stable and adapted for universal effective matting of water based emulsion paint or solvent borne long oil alkyd paints.
Preferably in said process for manufacturing of said aqueous matting slurry/dispersion said step (i) involves sequence of addition of ingredients for said stability of the slurry with said glycol added in the premix forming stage formed with oxirane trimethylhexyl ether, oil based ethoxylate derivatives, water; and, said thickener being added after grinding of silicon dioxide.

DETAILED DESCRIPTION OF THE INVENTION
As discussed hereinbefore, the present invention provides for aqueous matting slurry/ dispersion that is stable and behaves as universal matting slurry/aqueous dispersion for point of sale tinting at higher solids level of 15-25% as sheen variant and provided through one base for point of sale tinting thereby tinting through said universal slurry instead of providing number of product variants.
Higher the solids in the matting slurry higher will be the matting efficiency, but maintaining higher solids in the matting slurry is difficult due to extremely low bulk density of silicon dioxide together with the resultant stability that needs to be achieved of the matting slurry.
Slurry of the present invention is universal in nature, can be dispensed, and is stable over a period of time on higher solids based on involving universal silicon dioxide dispersion to give variations in matting for solvent based and water based products through point of sale.
Aqueous liquid dispersion composition of the present invention comprises amorphous silicon dioxide, Oxirane trimethylhexyl ether and ethoxylate derivatives together with glycol and with a solid content of 15-25%, together with a thickener that meets viscosity requirements for point of sale dispensing together with the urea thickener with viscosity range 60-90KU suitable for use via point of sale dispensing machine, which aqueous liquid dispersion is universal in nature for addition to either water based emulsion paint or solvent borne long oil alkyd paint composition, to enable effective matting.
Further the components of the aqueous liquid dispersion/slurry remains stable that not only arrests separation also provides certain rheology for dispensing which is shear viscosity range is 10-1 to 102 Pa.s for a shear rate range of 10-2 to 103 sec-1 at temperatures of 25 ?C which components of the slurry together with the desired viscosity in select levels also ensures that there is no settling during storage, also no viscosity build up during storage and at the same time the material flows freely during dispensing.
The advantageous attributes are as follows:-
a. Reduced inventory and effective matting viscosity ranges.
b. Long term performance
c. Free flowing liquid
d. Commercial application is favoured by reduced inventory, by having one high sheen product and providing variations in matt at differentiated price points.

EXAMPLES:
Example 1
The ingredients of the universal matting slurry formulation of amorphous silicon dioxide, Oxirane trimethylhexyl ether and ethoxylate derivatives (said derivatives are bought as a packaged value-added product) together with glycol and with a solid content of 15-25%, together with a urea based thickener, is blended and the formulations not in accordance with the invention were also prepared providing for the following results.

Raw materials Ethoxylate Glycol Oxirane trimethylhexyl ether Silicon dioxide Thickener/ Rheology Modifier

Ingredients in accordance with the invention Ethoxylate including Soya or groundnut oil based ethoxylates with, HLB 13-14; Iodine Value, 20 – 25 Hydroxyl Value, mg KOH/g 110-120) Propylene Glycol Oxirane trimethylhexyl ether Silicon dioxide Urea based thickener including polyurethane modified, NVM- 48-56)
Wt. % in accordance with the invention 15-20 16-18 3-6 15-18 1.2-2.5
Wt. % NOT in accordance with the invention Ethoxylate- Less than 13% did not work humectancy reduces
Glycol-
Less than 16% shows humectancy at lower side when dosage increase from above 20% shows haziness in Enamel. Oxirane trimethylhexyl ether – Less than 3% results in wetting issue. Above 6% results in incompatibility in Enamel. -do- Lower than 1.2% results in settling and above 2.5 results in very high viscosity and improper flow
Matting with water borne Paint Specifications of compatible water borne Paint
Evidence of compatibility with water borne resin in terms of stability/ sheen Acrylic Emulsion, NVM- 50-65, PVC 25-35; Sheen Range @ 60 degree 8-25 units)
Sheen drop on slurry addition is 25 units at 85 deg & 8 units drop at 60 deg

Vinyl Acrylic Emulsion, NVM- 50-65, PVC 25-35; Sheen Range @ 60 degree 8-25 units)
Sheen drop on slurry addition is 25 units at 85 deg & 8 units drop at 60 deg

Styrene Acrylic Emulsion; NVM- 50-65, PVC – 25-35; Sheen Range @ 60 degree 8-25 units)
Sheen drop on slurry addition is 25 units at 85 deg & 8 units drop at 60 deg
For all the above resins PVC needs to be below 70 as PVC above 70 is matt already so no further matting is required/possible.
Matting with solvent borne Paint Specification of compatible solvent borne paint
Evidence of compatibility with solvent borne resin in terms of stability/ sheen Long oil alkyd Based, Gloss@20 deg> 80, NVM 40-70, PVC 30-40, Gloss drop on slurry addition is 59 units at 20 deg;
Epoxy Based Gloss @60 deg 35-50, NVM 70-75, Sheen drop on slurry addition is 20 units at 60 deg;
Polyurethane Gloss @20 deg >90, NVM 45-60, Gloss drop on slurry addition is 105 units at 20 deg.
Ingredients not in accordance with the invention as underlined Soya or Groundnut Oil based Ethoxylate including mixtures having HLB 13-14 Propylene Glycol Polyetheralkanolamine, a known dispersant Silicon dioxide Urea based thickener
Oil based Ethoxylate Propylene Glycol Betaine, a known dispersant Silicon dioxide Urea based thickener
Oil based Ethoxylate Propylene Glycol Oxirane trimethylhexyl ether Silicon dioxide Arylic polymer
Oil based Ethoxylate Propylene Glycol Alcohols, C12-14, ethoxylated, a known dispersant Silicon dioxide Urea based thickener
Oil based Ethoxylate Propylene Glycol Polymer with quaternized ammonium groups, a known dispersant Silicon dioxide Urea based thickener
Oil based Ethoxylate Propylene Glycol Fatty-acid-modified polyester + Polyetheralkanolamine, known dispersants Silicon dioxide Urea based thickener
Incompatible with certain types of water borne resins in terms of stability/ sheen None Identified.
Incompatible with certain types of solvent borne resins in terms of stability/ sheen In some other PU resins other than Polyurethane Gloss @20 deg >90, NVM 45-60, Gloss/ Sheen reduction achieved on slurry/dispersion addition was not as much as 105 units at 20 deg, compatibility however is not an issue.

Example 2:

This Example sets forth how the compatibility studies were checked to determine the stability and gloss/sheen attained in various water borne and solvent borne paints after the dispersion/slurry of the present invention is added to the same and as demonstrated under Example 1.

Slurry/ dispersion is added at select levels in the product as per required matting. The matting is tested by measuring the sheen levels on a glossometer. For solvent based products other properties such hardness – Pencil and scratch hardness, Impact- Reverse and Front is checked, Adhesion and Flexibility is also evaluated. The method followed are:
Pencil Hardness-ASTM D3363
Scratch hardness-ASTM G171
Impact resistance- ASTM D5628-18
Adhesion resistance-ASTM D3359-17
Flexibility- ASTM D4338-97(2021)
Gloss/Sheen measured using Tri-Glossmaster (20-60-85) from Sheen Instruments Ltd.
Stability conducted by placing 200 ml of Matting slurry in Oven maintained at 55deg Celsius for 1 month.
Viscosity of slurry/ dispersion measured using Brookfield stormer viscometer (Model: KU3ASTKB0) at 30 deg Celsius; units referred to in KU.

Example 3:

A process for manufacturing said aqueous matting slurry/dispersion is provided comprising the steps of
providing amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, oil based ethoxylate derivatives, and urea thickener over premix and grinding stages in select wt.% ranges of the following:
15-18 wt.% silicon dioxide that is amorphous;
3-6 wt.% Oxirane trimethylhexyl ether;
16-18 wt. % glycol; and
15-20 wt.% oil based ethoxylate derivatives.
1.2-2.5 wt.% Urea thickener; and
processing in high-speed disperser at 2000 RPM at temperature between 25-40 deg Celsius to obtain therefrom said aqueous matting slurry/dispersion that is stable and adapted for universal effective matting of water based emulsion paint or solvent borne long oil alkyd paints.
Said amorphous silicon dioxide, Oxirane trimethylhexyl ether, glycol, soyabean or groundnut oil based ethoxylate derivatives or mixtures thereof having HLB 13-14, and urea thickener over premix and grinding stages in select wt.% ranges involves sequence of addition of ingredients for said stability of the slurry with said glycol added in the premix forming stage formed with oxirane trimethylhexyl ether, oil based ethoxylate derivatives, water; and, said thickener being added after grinding of silicon dioxide.
Further to the above stability of aqueous matting slurry/ dispersion when checked was found to be stable at 55 deg C for a month with natural stability of at least 1.5 yrs at ambient temperature of about 40 ?C maintaining desired viscosity is 10-1 to 102 Pa.s for a shear rate range of 10-2 to 103 sec-1 at temperatures of 25 ?C throughout its shelf life, and when the same is incorporated in solvent borne resin variants present in solvents such as mineral Turpentine, Xylene, and Butanol the compatibility and matting effect along with the film performance is desirable.
It is thus possible by way of the present advancement to provide for aqueous matting slurry/ dispersion that is universal in nature, can be dispensed, and is stable over a period of time on higher solids based on involving universal silicon dioxide dispersion to give variations in matting for solvent based and water based products through point of sale tinting.