Coating compositions containing rheology control agents

• US 20060155021A1
• Filed: 01/12/2006
• Published: 07/13/2006
• Est. Priority Date: 01/13/2005
• Status: Abandoned Application

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Barsotti, Robert John, Ding, Jiang, Lenges, Christian Peter, Kelly, Renee J., Kim, Young H., Butera, Robert James, Hsiao, Yu-Ling, Niu, Yanhui
• Application Number:
  US11/330,477
• Publication Number:
  US 20060155021A1
• Time in Patent Office: Days
• US Class Current: 524/211
• CPC Class Codes: C08K 5/21 Urea; Derivatives thereof, e.g. biuret

Abstract

The present invention provides for a coating composition containing a rheology control agent having improved rheology control particularly in low VOC solvent-borne coating compositions and water-borne coating compositions useful for OEM refinishing or repainting the exterior of automobile and truck bodies and parts thereof; the rheology control agent used in the coating composition comprises the following compound represented by the following formula

wherein A, B, C and D equal CH₂, CHR, NH, or O, and A, B, C and D may be the same or different and at least one of A and B equals NH and at least one of C and D equals NH; and wherein R₁, R₂, and R₃ are described in the specification.

Claims

1. A coating composition comprising film forming binder, a liquid carrier and a rheology control agent comprising a compound of the following formula:

wherein A, B, C and D equal CH₂, CHR, NH, or O, and may be the same or different and at least one of A and B equals NH and at least one of C and D equals NH; and

wherein R₁, R₂, and R₃ may be the same or different and represent a linear, branched, hyper-branched, or dendritic ether, polyether or hydrocarbon based chain, optionally forming at least one carbon-based ring, being saturated or unsaturated and R₂ represents linear or branched alkylenes, ethers, polyethers, or polyester linkages and at least one of R₁, R₂, and R₃ comprises an ester group which is branched off from the main chain.

2. The coating composition of claim 1 wherein the rheology control agent comprises A, B, C, and D equaling NH and R₂ comprises an ester group, which is branched off from the main chain of the molecule.

3. The coating composition of claim 2 wherein the rheology control agent comprises a formula selected from the group consisting of

4. The coating composition of claim 2 wherein R₁ and R₃ of the rheology control agent each comprise at least one ester group.

5. The coating composition of claim 4 wherein the rheology control agent has a formula selected from the group consisting of

6. The coating composition of claim 2 wherein the rheology control agent having R₁ and R₃comprise at least on urethane group.

7. The coating composition of claim 6 wherein the rheology control agent has a formula selected from the group consisting of

8. The coating composition of claim 1 wherein the rheology control agent having A and D equal O, B and C equal NH, and R₂ comprises an ester group branched off the main chain.

9. The coating composition of claim 8 wherein the rheology control agent has the formula

10. The coating composition of claim 1 wherein the rheology control agent A and D equal O, B and C equal NH, and R₂ comprises an ester group branched off the main chain having R₁ and R₃each comprise a urea group.

11. The coating composition of claim 10 wherein the rheology control agent has a formula selected from the group consisting of

12. The coating composition of claim 1 wherein the rheology control agent wherein A, B, C, and D equal NH and R₁ and R₃ each comprise at least one ester group branched off the main chain.

13. The coating composition of claim 12 wherein the rheology control agent has a formula selected from the group consisting of

14. The coating composition of claim 1 wherein the rheology control agent having A, C, and D are NH, B is O, R₂ comprises at least one ester group which is branched off the main chain.

15. The coating composition of claim 14 wherein the rheology control agent has the formula

16. The coating composition of claim 1 wherein A and D are O, and B and C are NH, and R₁ and R₃ each comprise at least one urea group and one ester group which is branched off from the main chain of the molecule.

17. The coating composition of claim 16 wherein the rheology control agent has the formula

18. The coating composition of claim 1 comprising 5 to 95 percent by weight of an organic solvent and 5 to 95 percent by weight of film forming polymer and 0.1 to 30 percent by weight of the rheology control agent, all weight percent are based on the total weight of the coating composition.

19. The coating composition of claim 18 wherein the film forming polymer comprises linear poly(meth)acrylates, branched, grafted or segmented poly(meth)acrylates, polyesters, branched copolyester, oligomers, urethane oligomers, polyesterurethanes, polyepoxides and carbamate functional polymers.

20. The coating composition of claim 19 containing a crosslinking agent selected from the group of a polyisocyanate, an alkylated melamine, a polyepoxide, a silane and any mixtures thereof.

21. The coating composition of claim 1 comprising 5 to 95-percent by weight of an organic solvent and 5 to 95 percent by weight of film forming polymer and 0.1 to 30 percent by weight, based on the weight of the polymer of the rheology control agent of claim 1 and finely divided silica in a weight ratio of rheology control agent to silica of 0.1:

1.0 to 1.0;

0.1.

22. The coating composition of claim 1 being a solvent borne clear coating composition.

23. The coating composition of claim 18 containing pigment and being a lacquer coating composition.

24. The coating composition of claim 18 containing a crosslinking agent.

25. The coating composition of claim 23 containing pigment in a pigment to binder ratio of about 10/100 to 300/100.

26. A substrate coated with at least one layer of the composition of claim 1.

27. The coating composition of claim 1 comprising 5 to 95 percent by weight of an aqueous carrier and 5 to 95 percent by weight of film forming polymer and 0.1 to 30 percent by weight of the rheology control agent, all weight percent are based on the total weight of the coating composition.

28. The coating composition of claim 27 wherein the film forming polymer comprises linear poly(meth)acrylates, branched, grafted or segmented poly(meth)acrylates, polyesters, branched copolyester, oligomers, urethane oligomers, polyesterurethanes, polyepoxides and carbamate functional polymers.

29. The coating composition of claim 28 containing a crosslinking agent selected from the group of a polyisocyanate, an alkylated melamine, a polyepoxide, a silane and any mixtures thereof.

30. The coating composition of claim 1 comprising 5 to 95-percent by weight of an aqueous liquid carrier and 5 to 95 percent by weight of film forming polymer and 0.1 to 30 percent by weight, based on the weight of the polymer of the rheology control agent and finely divided silica in a weight ratio of rheology control agent to silica of 0.1:

1.0 to 1.0;

0.1.

31. The coating composition of claim 27 being a clear coating composition.

32. The coating composition of claim 27 containing pigment and being a lacquer coating composition.

33. The coating composition of claim 27 containing pigment and a crosslinking agent.

34. The coating composition of claim 32 containing pigment in a pigment to binder ratio of about 10/100 to 300/100.