Waterborne wet look coating composition
View Patent ↗A water-based coating composition is described herein. The composition includes an aqueous dispersion derived from an ethylenically unsaturated monomer and one or more organic solvents. The composition when applied to a substrate and allowed to dry provides a wet look to the substrate.
1. A coating composition for a cementitious substrate, comprising:
an aqueous dispersion comprising a polymer and an aqueous carrier, the polymer having a number average molecular weight greater than 5,000 and up to about 50,000, the polymer having a Tg of greater than 0° C., and the polymer derived from at least one ethylenically unsaturated monomer; and
a combination of two or more organic solvents comprising:
a first solvent having a boiling point between about 120° C. and 210° C.; and
a second solvent having a boiling point between about 210° C. and 300° C.,
wherein the polymer comprises about 40 to about 90 wt % of the total weight of the dispersion, not including the aqueous carrier, and the combination of the two or more organic solvents comprise about 10 to about 60 wt % of the coating composition based on the total weight of the dispersion, not including the aqueous carrier; and
wherein the coating composition, when applied to the cementitious substrate and allowed to dry, provides a wet look.
2. The composition of claim 1 , wherein the ethylenically unsaturated monomer is selected from acrylic acid, C 1 -C 22 esters of acrylic acid, substituted C 1 -C 22 esters of acrylic acid, methacrylic acid, C 1 -C 22 ester of methacrylic acid, substituted C 1 -C 22 esters of methacrylic acid, styrene, a-methyl styrene, acrylamide, N-substituted alkyl acrylamide, vinyl toluene, vinyl acetate, vinyl versatate, C 1 -C 22 vinyl esters, C 1 -C 22 esters of maleic acid, vinyl propionate, allyl methacrylate, and mixtures thereof.
3. The composition of claim 1 , wherein the ethylenically unsaturated monomer is selected from styrene, methyl methacrylate, 2-ethyl hexyl acrylate, methacrylic acid, and combinations thereof.
4. The composition of claim 1 , wherein the polymer is derived from a combination of methylmethacrylate, 2-ethyl hexyl acrylate and methacrylic acid.
5. The composition of claim 1 , wherein the polymer has Tg of about 10° C. to about 80° C.
6. The composition of claim 1 , wherein the first solvent has boiling point between 140° C. and 180° C.
7. The composition of claim 1 , wherein the second solvent has boiling point between 210° C. and 260° C.
8. The composition of claim 1 , wherein the polymer has number average molecular weight of about 15,000 to about 40,000.
9. The composition of claim 1 , wherein the polymer has number average molecular weight of about 10,000 to about 30,000.
10. The composition of claim 1 , wherein the combination of two or more organic solvents comprises about 10 to 50 wt % of the total weight of the dispersion, not including the aqueous carrier.
11. The composition of claim 1 , wherein the polymer comprises about 40 to 90 wt % of the total weight of the dispersion, not including the aqueous carrier.
12. The composition of claim 1 , wherein the dispersion comprises about 30 to 90 wt % water.
13. The composition of claim 1 , wherein the dispersion further comprises a crosslinker.
14. The composition of claim 1 , wherein the cementitious substrate includes a first coating applied thereon prior to the application of the coating composition.
15. The composition of claim 1 , wherein the polymer is manufactured by a solution polymerization method.
16. The composition of claim 1 , wherein the polymer is manufactured by a bulk polymerization method.
17. The composition of claim 1 , wherein the polymer is manufactured by a dispersion polymerization method.
18. The composition of claim 1 , wherein the polymer is manufactured by a latex polymerization method.
19. The composition of claim 1 , wherein the dispersion is formed by emulsifying a solvated polymer into water.
20. A method of coating a cementitious substrate, comprising:
applying on the cementitious substrate a coating composition comprising:
an aqueous dispersion of a polymer and an aqueous carrier, the polymer having a number average molecular weight greater than 5,000 and up to about 50,000 and a Tg of greater than 0° C. and derived from at least one ethylenically unsaturated monomer;
a combination of two or more organic solvents comprising:
a first solvent having a boiling point between about 120° C. and 210° C.; and
a second solvent having a boiling point between about 210° C. and 300° C.,
wherein the polymer comprises about 40 to about 90 wt % of the total weight of the dispersion, not including the aqueous carrier, and the combination of the two or more organic solvents comprise about 10 to about 60 wt % of the coating composition based on the total weight of the dispersion, not including the aqueous carrier; and
allowing water to evaporate from the substrate to provide a coating with a wet look.
21. A coating composition for a cementitious substrate, comprising:
an aqueous dispersion comprising a latex polymer and an aqueous carrier, the latex polymer having a number average molecular weight greater than 5,000 and up to about 50,000, the latex polymer having a Tg of greater than 0° C., and the latex polymer derived from at least one ethylenically unsaturated monomer; and
a combination of two or more organic solvents comprising:
a first solvent having a boiling point between about 120° C. and 210° C.; and
a second solvent having a boiling point between about 210° C. and 300° C.,
wherein the latex polymer comprises about 40 to about 90 wt % of the total weight of the dispersion, not including the aqueous carrier, and the combination of the two or more organic solvents comprise about 10 to about 60 wt % of the coating composition based on the total weight of the dispersion, not including the aqueous carrier; and
wherein the coating composition is devoid of a colorant or pigment, such that when the coating composition is applied to the cementitious substrate and allowed to dry, provides a clear wet look.