Latex polymer for improved paint washability

Patent metadata

Field	Value
Publication number	US-11299574-B2
Application number	US-201816055518-A
Country	US
Kind code	B2
Filing date	Aug 6, 2018
Priority date	Mar 6, 2012
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention is directed to a coating composition or paint comprising a polymer system including one or more latex polymers, wherein the acid content and molecular weight of the latex polymers are balanced to provide a coating composition that demonstrates optimal performance characteristics of washability or stain resistance, especially when used in a flat finish paint.

First claim

What is claimed is:

1. An architectural paint, comprising:
a polymer system comprising one or more latex polymers, wherein at least about 10% up to 30% by weight of the polymer system includes at least one polymer having a molecular weight of about 10,000 to about 40,000 and an acid percent of at least about 5 up to about 20.

2. The architectural paint of claim 1 , wherein the paint has a pigment volume concentration (PVC) of about 25 to 60.

3. The architectural paint of claim 1 , wherein the paint has a pigment volume concentration (PVC) of about 30 to 55.

4. The architectural paint of claim 1 , wherein the one or more latex polymers include one or more polymerization products of one or more acrylic monomers.

5. The architectural paint of claim 1 , wherein the one or more latex polymers comprise one or more alkali-soluble support polymers.

6. The architectural paint of claim 5 , wherein the one or more alkali-soluble support polymers comprises the at least one polymer having a molecular weight of about 10,000 to about 40,000 and an acid percent of at least about 5 up to about 20.

7. The architectural paint of claim 1 , further comprising a coalescent agent having a volatile organic compounds (VOC) content of less than about 15%.

8. The architectural paint of claim 1 , wherein the polymer system comprises:
a first latex polymer comprising about 40 to 95 wt % of the polymer system, based on the total weight of the system; and
a second latex polymer comprising about 5 to 60 wt % of the polymer system, based on the total weight of the system;
wherein the at least one polymer having a molecular weight of about 10,000 to about 40,000 and an acid percent of at least about 5 up to about 20 is present in the first latex polymer, the second latex polymer, or both.

9. The architectural paint of claim 2 , wherein a first latex polymer comprises a polymerization product from butyl acrylate, methyl methacrylate and methacrylic acid, and a second latex polymer comprises a polymerization product from butyl acrylate, methyl methacrylate, methacrylic acid, and dodecanethiol.

10. The architectural paint of claim 1 , wherein the polymer system comprises a first latex polymer and a second latex polymer, wherein the ratio of the first latex polymer to the second latex polymer is from 10:90 to 90:10.

11. The architectural paint of claim 1 , wherein the at least one polymer being at least about 10% up to 30% by weight of the polymer system has a molecular weight of about 15,000 to 35,000.

12. The architectural paint of claim 1 , wherein the at least one polymer being at least about 10% up to 30% by weight of the polymer system has a molecular weight of about 20,000 to about 30,000.

13. The architectural paint of claim 1 , wherein the at least one polymer being at least about 10% up to 30% by weight of the polymer system has an acid percent of about 5 up to about 10.

14. The architectural paint of claim 1 , wherein the coating composition exhibits a washability rating of at least 6.

15. The architectural paint of claim 1 , wherein the coating composition exhibits a washability rating of at least 7.

16. The architectural paint of claim 1 , wherein the composition exhibits a washability rating of at least 8.

17. The architectural paint of claim 1 , wherein the polymer system comprises at least one polymerization product from styrene, butyl acrylate, 2-(acetoacetoxy)ethyl methacrylate, methyl methacrylate, and butyl methacrylate.

18. The architectural paint of claim 1 , wherein at least about 15% up to 30% by weight of the polymer system includes the at least one polymer having a molecular weight of about 10,000 to about 40,000 and an acid percent of at least about 5 up to about 20.

19. The architectural paint of claim 1 , wherein at least about 15% up to 25% by weight of the polymer system includes the at least one polymer having a molecular weight of about 10,000 to about 40,000 and an acid percent of at least about 5 up to about 20.

20. The architectural paint of claim 1 , wherein the at least one polymer having the molecular weight of about 10,000 to about 40,000 and the acid percent of about 5 up to about 20 is provided by methacrylic acid.

Assignees

• Swimc Llc

Inventors

• Hibben Mary Jane
• Wildman Michael
• Killilea T Howard
• Heiden William
• Johnson Bruce

Classifications

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C09D133/06

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C09D131/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08F265/06 Primary

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title