Low solids coating compositions having polyurea rheology control agents, methods for making such coating compositions, and systems for making such coating compositions
View Patent ↗Low solids coating compositions having polyurea rheology control agents, methods for making such coating compositions, and systems for making such coating compositions are provided. In accordance with an exemplary embodiment, a coating composition with no more than 30 weight percent nonvolatile content includes a colorant, a polyurea rheology control agent comprising polyurea crystals and a moderating resin, a film forming binder resin, and a solvent.
1. A coating composition with no more than 30 weight percent nonvolatile content, the coating composition comprising:
a colorant;
a polyurea rheology control agent, wherein the polyurea rheology control agent comprises a reaction product of an amine and an isocyanate, and wherein the isocyanate is selected from 1,6-hexamethylene diisocyanate, 2,2,4-trimethylhexane-1,6-diisocyanate, 2,4,4-trimethylhexane-1,6-diisocyanate, adduct of hexamethylene diisocyanate, xylene diisocyanate, 1,3,5-trimethyl-2,4-bis(isocyanatomethyl)benzene, toluene diisocyanate, diphenyl methane-4,4′-diisocyanate, adduct of toluene diisocyanate, and a combination thereof, and wherein the amine is selected from benzyl amine, aniline, and a combination thereof;
a film forming binder resin; and
a solvent.
2. The coating composition of claim 1 , wherein the coating composition has no more than 25 weight percent nonvolatile content, based on a total weight of the coating composition.
3. The coating composition of claim 2 , wherein the coating composition has no more than 20 weight percent nonvolatile content, based on the total weight of the coating composition.
4. The coating composition of claim 1 , wherein the polyurea rheology control agent is present in the coating composition in an amount in the range of from about 0.5 to about 10 weight percent based on a total weight of the coating composition.
5. The coating composition of claim 4 , wherein the polyurea rheology control agent is present in the coating composition in an amount in the range of from about 1.5 to about 7 weight percent based on the total weight of the coating composition.
6. The coating composition of claim 1 , wherein the polyurea rheology control agent comprises polyurea crystals in an amount in the range of from about 1 to about 10 wt. % based on a total weight of the polyurea rheology control agent.
7. The coating composition of claim 6 , wherein the polyurea rheology control agent comprises the polyurea crystals in an amount in the range of from about 2 to about 8 wt. % based on the total weight of the polyurea rheology control agent.
8. The coating composition of claim 7 , wherein the polyurea rheology control agent comprises the polyurea crystals in an amount in the range of from about 2 to about 5 wt. % based on the total weight of the polyurea rheology control agent.
9. The coating composition of claim 1 , wherein the polyurea rheology control agent comprises polyurea crystals in an amount in the range of from about 0.2 to about 3 wt. % based on a total nonvolatile content of the coating composition.
10. The coating composition of claim 9 , wherein the polyurea rheology control agent comprises the polyurea crystals in an amount in the range of from about 0.4 to about 2 wt. % based on the total nonvolatile content of the coating composition.
11. The coating composition of claim 1 , wherein the amine is benzyl amine.
12. The coating composition of claim 1 , wherein the amine is aniline.
13. The coating composition of claim 1 , wherein the amine is benzyl amine and the isocyanate is 1,6-hexamethylene diisocyanate.
14. The coating composition of claim 1 , further comprising a VOC-exempt solvent present in an amount of from about 0 to about 95 wt. % based on a total weight of the coating composition, wherein the VOC-exempt solvent is selected from acetone, methyl acetate, tertiary butyl acetate (TBAc), P-chlorobenzotriflouride (PCBTF), and a combination thereof.
15. The coating composition of claim 14 , wherein the VOC-exempt solvent is present in an amount of from about 60 to about 85 wt. % based on the total weight of the coating composition.
16. The coating composition of claim 1 , further comprising a crosslinking agent, an ultraviolet light stabilizer, an ultraviolet light absorber, an antioxidant, a hindered amine light stabilizer, a leveling agent, a rheological agent, a thickener, an antifoaming agent, a wetting agent, or any combination thereof.
17. A system for producing a low solids coating composition with no more than 30 weight percent nonvolatile content, the system comprising:
a colorant;
a binder solution;
a polyurea rheology control agent, wherein the polyurea rheology control agent comprises a reaction product of an amine and an isocyanate, and wherein the amine is selected from benzyl amine, aniline, and a combination thereof; and
a reducer;
wherein the colorant, the binder solution, the polyurea rheology control agent, and the reducer are packaged and/or sold together as a product.
18. A method for producing a low solids coating composition comprising the steps of:
mixing a colorant, a binder solution, a polyurea rheology control agent, and a reducer in amounts such that the low solids coating composition has no more than 30 weight percent nonvolatile content based on a total weight of the low solids coating composition, wherein the polyurea rheology control agent comprises a reaction product of an amine and an isocyanate, and wherein the amine is selected from benzyl amine, aniline, and a combination thereof.
19. The method of claim 18 , wherein mixing further comprises mixing a crosslinking component with the colorant, the binder solution, the polyurea rheology control agent, and the reducer.