Aqueous stain resistant coating composition
The present disclosure refers to an aqueous stain resistant coating composition, comprising, one or more aqueous dispersions of self-crosslinkable polymeric particles; and one or more particulate solids, wherein the polymeric particles have a Tg of 10° C. or less; and wherein the particulate solids comprise a combination of sheet-like particulate solids and sphere-like particulate solids in a weight ratio of 1:1 or more; and wherein the coating composition has a pigment volume concentration of 45% or more; and the coating composition is substantially free of volatile organic compounds.
1. An aqueous stain resistant coating composition, comprising, one or more aqueous dispersions of self-crosslinkable polymeric particles; and one or more particulate solids,
wherein the polymeric particles have a Tg of 10° C. or less; and
wherein the particulate solids comprise a combination of sheet-like particulate solids and sphere-like particulate solids in a weight ratio of 1:1 or more, wherein the size of the sphere-like particulate solids is smaller than that of the sheet-like particulate solids; and
wherein the coating composition has a pigment volume concentration of 45% or more; and the coating composition is substantially free of volatile organic compounds.
2. The aqueous stain resistant coating composition according to claim 1 , comprising, based on the total weight of the coating composition, 25 to 70 wt % of the aqueous dispersion of polymeric particles; and 32 to 75 wt % of the particulate solids.
3. The aqueous stain resistant coating composition according to claim 1 , wherein the coating composition has a pigment volume concentration of 50% or more.
4. The aqueous stain resistant coating composition according to claim 1 , wherein the polymeric particles have a Tg of 5° C. or less.
5. The aqueous stain resistant coating composition according to claim 1 , wherein the polymeric particles have a Tg as low as −5° C.
6. The aqueous stain resistant coating composition according to claim 1 , wherein the polymer particles have a particle size of 200 nm or less.
7. The aqueous stain resistant coating composition according to claim 1 , wherein the polymer particles comprises acrylates polymers, styrene-acrylates polymers, organic silicones modified acrylates polymers, polyurethanes modified acrylates polymers or any combination thereof.
8. The aqueous stain resistant coating composition according to claim 1 , wherein the polymeric particles are self-crosslinkable at room temperature.
9. The aqueous stain resistant coating composition according to claim 1 , wherein the particulate solids comprise the combination of sheet-like particulate solids and sphere-like particulate solids in a weight ratio of 1.0:1 or more but 3.0:1 or less.
10. The aqueous stain resistant coating composition according to claim 1 , wherein the sheet-like particulate solids have an equivalent diameter of 2 μm or more.
11. The aqueous stain resistant coating composition according to claim 1 , wherein the particulate solids further comprise other non-porous particulate solids.
12. The aqueous stain resistant coating composition according to claim 1 , wherein the particulate solids comprise pigments or fillers.
13. The aqueous stain resistant coating composition according to claim 12 , wherein the particulate solids comprise metals, alloys, metal oxides, metal salts, silicon dioxide, silicates or any combination thereof.
14. The aqueous stain resistant coating composition according to claim 12 , wherein the particulate solids comprise calcium carbonate, talc, mica or any combination thereof.
15. The aqueous stain resistant coating composition according to claim 14 , wherein the particulate solids comprise solid, sphere-like calcium carbonate, sheet-like talc, sheet-like mica or any combination thereof.
16. The aqueous stain resistant coating composition according to claim 1 , further comprising a fluoro agent, an organic silicone resin emulsion or the combination thereof.
17. The aqueous stain resistant coating composition according claim 16 , comprising, based on the total weight of the coating composition,
25 to 65 wt % of the aqueous dispersion;
32 to 65 wt % of the particulate solids;
0.1 to 2 wt % of the fluoro agents;
0.1 to 2 wt % of the organic silicone resin emulsion; and
0 to 10 wt % additional additives comprising a thickener, a dispersing agent, defoamer, a wetting agent, a pH adjuster, a coalescing agent with a boiling point of greater than 250° C., a bactericide, or a fungicide, or any combination thereof.
18. The aqueous stain resistant coating composition according to claim 1 , wherein the coating composition after film formation has a water contact angle of 70 to 110 degree.
19. A stain resistant coating obtained from allowing the aqueous stain resistant coating composition of claim 1 to cure over a substrate.