Latex polymer with improved washability and block resistance

Patent metadata

Field	Value
Publication number	US-12209198-B2
Application number	US-202217897939-A
Country	US
Kind code	B2
Filing date	Aug 29, 2022
Priority date	Dec 8, 2017
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Coating compositions or paint having a pigment blended with a polymer system including one or more latex polymers, wherein the polymer system contains an alkali-soluble resin having an acid value and molecular weight and provided in a preferably desired amount to demonstrate optimal performance characteristics of washability, stain resistance or scrubability without negatively impacting block resistance, especially when neutralized with a low-volatility base.

First claim

The invention claimed is:

1. A coating composition, comprising:
a polymer system comprising one or more latex polymers made from monomers comprising diacetone acrylamide; and at least one alkali-soluble resin; and
at least one pigment;
wherein the coating composition contains at least about 2.5 wt. % of the alkali-soluble resin based upon the total resin solid content of the coating composition, the alkali-soluble resin having a weight average molecular weight (Mw) of about 1,500 to about 20,000 and an acid number greater than about 100 mg KOH/g resin;
wherein a cured film of the coating composition has an improved washability compared to an analogous coating composition made without the alkali-soluble resin.

2. A coating composition according to claim 1 , wherein the coating composition contains up to about 15 wt. % of the alkali-soluble polymer based on total resin solid content.

3. A coating composition according to claim 1 , wherein the coating composition contains about 2.5 wt. % to about 7 wt. % of the alkali-soluble polymer based on total resin solid content.

4. A coating composition according to claim 1 , wherein a cured film of the coating composition applied to a black mylar substrate using a 7-mil Dow bar at 1 week at ambient temperature has at least one of the following properties: a washability rating of at least 7; a scrub resistance of at least about 600 scrubs; and a blocking resistance of at least 6.

5. A coating composition according to claim 1 , wherein the coating composition comprises a low-volatility base chosen from the group consisting of potassium hydroxide, sodium hydroxide, ammonia, 2-amino-2-methyl-1-propanol (AMP), diethyl amine (DEA), dimethylethanolamine (DMEA), triethylamine (TEA), monoethanol amine, diethanol amine, triethanolamine (TEOA), alkanolamine, and combinations thereof.

6. A coating composition according to claim 1 , comprising up to about 0.5 wt % of a fluorosurfactant.

7. A coating composition according to claim 1 , wherein the alkali-soluble resin comprises an organic solution polymerized polymer having an acid number of at least about 100 to about 250 mg KOH/g resin.

8. A coating composition according to claim 1 , wherein the one or more latex polymers are made from monomers comprising 2-(acetoacetoxy)ethyl methacrylate.

9. A coating composition according to claim 1 , wherein the coating composition comprises a coalescent.

10. A coating composition according to claim 9 , wherein the coating composition comprises a coalescent having a VOC content of less than about 5 g/L.

11. A coating composition according to claim 1 , wherein the coating composition has a pigment volume concentration between about 20 and about 40 or between about 10 and about 25.

12. A coating composition, comprising:
a dispersion of one or more latex polymers made from monomers comprising diacetone acrylamide; and at least one alkali-soluble resin, wherein the dispersion contains at least about 2.5 wt. % of the alkali-soluble resin based upon the total resin solid content of the coating composition, and the alkali-soluble resin has a weight average molecular weight (Mw) of about 1,500 to about 20,000 and an acid number greater than about 100 mg KOH/g resin;
wherein a cured film of the coating composition has an improved washability compared to an analogous coating composition made without the alkali-soluble resin.

13. A coating composition according to claim 12 , wherein the coating composition comprises a low-volatility base having a vapor pressure under about 100 mm Hg at 25° C.

14. A coating composition according to claim 12 , wherein the alkali-soluble resin has an acid number of at least about 125 to about 250 mg KOH/g resin.

15. A coating composition according to claim 12 , wherein the coating composition comprises an in-store tintable liquid base paint formulation in a container having headspace sufficient to receive a quantity of one or more low VOC colorants, wherein the colorant has less than about 20 g/L VOC.

16. A coating composition according to claim 12 , wherein the coating composition comprises an architectural paint.

17. A coating composition according to claim 12 , wherein the coating composition comprises a total resin solids in an amount of about 20 to about 30 wt %.

18. A coating composition according to claim 12 , wherein the coating composition has a viscosity in the range from about 80 to about 120 KU (Krebs Unit).

19. A coating composition comprising:
a polymer system comprising one or more latex polymers made from monomers comprising 2-(acetoacetoxy) ethyl methacrylate and diacetone acrylamide; and at least one alkali-soluble resin; and
at least one pigment;
wherein the coating composition contains at least about 2.5 wt. % of the alkali-soluble resin based upon the total resin solid content of the coating composition, the alkali-soluble resin having a weight average molecular weight (Mw) of about 1,500 to about 20,000 and an acid number greater than about 100 mg KOH/g resin.

20. A coating composition comprising:
a polymer system comprising one or more latex polymers made from monomers comprising diacetone acrylamide; and at least one alkali-soluble resin;
at least one pigment; and
a coalescent having a VOC content of less than about 5 g/L;
wherein the coating composition contains at least about 2.5 wt. % of the alkali-soluble resin based upon the total resin solid content of the coating composition, the alkali-soluble resin having a weight average molecular weight (Mw) of about 1,500 to about 20,000 and an acid number greater than about 100 mg KOH/g resin.

21. A coating composition comprising:
a polymer system comprising one or more latex polymers made from monomers comprising diacetone acrylamide; and at least one alkali-soluble resin; and
at least one pigment;
wherein the coating composition contains at least about 2.5 wt. % of the alkali-soluble resin based upon the total resin solid content of the coating composition, the alkali-soluble resin having a weight average molecular weight (Mw) of about 1,500 to about 20,000 and an acid number greater than about 100 mg KOH/g resin; and
wherein the coating composition has a pigment volume concentration between about 20 and about 40 or between about 10 and about 25.

Assignees

• Swimc Llc

Inventors

• Christensen Dana
• Bell Tyler
• Sandoval Robert
• Hibben Mary Jane
• Wildman Michael

Classifications

• C08F2/00

  Processes of polymerisation · CPC title

• C08F20/18

  with acrylic or methacrylic acids · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title