IP Library › Granted Patent US 12,209,198
Granted Patent B2
US 12,209,198 · App. 17/897,939 · Granted Jan 28, 2025

Latex polymer with improved washability and block resistance

Inventors: Dana Christensen (Crystal Lake, IL); Tyler Bell (Crystal Lake, IL); Robert Sandoval (Crystal Lake, IL); Mary Jane Hibben (Elburn, IL); Michael Wildman (Hoffman Estates, IL)
Assignee: SWIMC LLC
C09D133/08C08F2/00C08F20/18C08K2003/2241
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Quick Facts
Patent No.
US 12,209,198
App. No.
17/897,939
Granted
Jan 28, 2025
Kind
B2
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.

Claims (38)

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.