Aqueous coating compositions containing acetoacetyl-functional polymers, coatings, and methods

• US 20060135686A1
• Filed: 01/30/2006
• Published: 06/22/2006
• Est. Priority Date: 12/17/2004
• Status: Active Grant

• Current Assignee: Swimc, LLC (The Sherwin-Williams Company)
• Original Assignee: Valspar Sourcing, Inc. (Sherwin-Williams Company)
• Inventors: Killilea, T. Howard, Chen, Frank, Bohannon, James M., Wu, Shaobing
• Granted Patent: US 8,609,762 B2
• Time in Patent Office: Days
• US Class Current: 524/556
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 33/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09D 133/06 of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
• CPC Class Codes: C09D 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen

Abstract

An aqueous coating composition containing (i) a polymer having one or more acetoacetyl-functional groups; and (ii) an acid-functional polymer, which may be the same as or distinct from the polymer comprising acetoacetyl-functional groups, wherein a nitrogen-free base has been used to neutralize or partially neutralize the acid-functionality on the polymer.

Claims

1. A coating composition comprising:

water;

a polymer comprising one or more acetoacetyl-functional groups; and

an acid-functional polymer, which may be the same as or distinct from the polymer comprising acetoacetyl-functional groups, wherein a nitrogen-free base has been used to neutralize or partially neutralize the acid-functionality on the polymer.

2. The coating composition of claim 1, wherein the acetoacetyl-functional group is of the formula:

—

C(O)—

R¹—

C(O)—

R², and wherein R¹ is a C1 to C22 alkylene group and R² is a C1 to C22 alkyl group.

3. The coating composition of claim 1, wherein the base is selected from the group consisting of KOH, Ca(OH)₂, NaOH, LiOH, and mixtures thereof.

4. The coating composition of claim 1, wherein the coating is in the form of a clear coating that is substantially non-luminescing.

5. The coating composition of claim 1, wherein the polymer comprising one or more acetoacetyl-functional groups and the acid-functional polymer are the same polymer.

6. The coating composition of claim 1, wherein the polymer comprising one or more acetoacetyl-functional groups;

and the acid-functional polymer are distinct polymers.

7. The coating composition of claim 1, wherein the composition further comprises a (meth)acrylate functional compound.

8. The coating composition of claim 7, wherein the (meth)acrylate functional compound is a monomer, oligomer, polymer, or mixture thereof.

9. The coating composition of claim 7, wherein the (meth)acrylate functional compound is a multifunctional monomer.

10. The coating composition of claim 9, wherein the (meth)acrylate-functional monomer is selected from the group consisting of isobornyl (meth)acrylate, isodecyl (meth)acrylate, phenoxyethyl (meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane ethoxylate tri(meth)acrylate, tripropylene glycol di(meth)acrylate, hexanediol di(meth)acrylate, tetrahydrofurfuryl (meth)acrylate, beta-carboxyethyl (meth)acrylate, bisphenol A ethoxylate di(meth)acrylate, ethoxylated neopentyl glycol di(meth)acrylate, propoxylated neopentyl glycol di(meth)acrylate, di-(trimethyolpropane tetra (meth)acrylate), pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, and mixtures thereof.

11. The coating composition of claim 1, comprising no more than 10 wt-% volatile organic compounds, based on the total weight of the composition.

12. The coating composition of claim 1, wherein the acetoacetyl-functional polymer comprises an acetoacetyl-functional polyurethane, epoxy, polyamide, chlorinated polyolefin, acrylic, oil-modified polymer, polyester, or mixtures or copolymers thereof.

13. The coating composition of claim 1, wherein the acetoacetyl-functional polymer comprises an acetoacetyl-functional latex polymer prepared from ethylenically unsaturated monomers.

14. The coating composition of claim 1, wherein the acetoacetyl-functional polymer is present in an amount of at least 10 wt-% and no more than 95 wt-%, based on the combined weight of any monomers, oligomers, and polymers in the composition.

15. The coating composition of claim 1, further comprising a photoinitiator.

16. The coating composition of claim 15, wherein the photoinitiator comprises benzophenone, 4-methylbenzophenone, benzoyl benzoate, phenylacetophenones, 2,2-dimethoxy-2-phenylacetophenone, alpha,alpha-diethoxyacetophenone, hydroxycyclo-hexylphenylketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, bis-(2,6-dimethoxybenzoyl)-2,4,4-trimethylpentyl phosphine oxide, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, or combinations thereof.

17. The coating composition of claim 15, which is at least partially curable by ultraviolet or visible light.

18. A method of coating a substrate, the method comprising:

applying the coating composition of claim 1 to a substrate; and

allowing the coating composition to harden.

19. A coating on a substrate preparable by the method of claim 18.