Coating composition for stain resistant coatings

Patent metadata

Field	Value
Publication number	US-10975259-B2
Application number	US-201916521850-A
Country	US
Kind code	B2
Filing date	Jul 25, 2019
Priority date	Jul 25, 2019
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A coating composition includes: (a) a first acrylic polymer formed from a reaction mixture including: (i) an ethylenically unsaturated monomer including an acid group or an amine group; (ii) a reactive solvent reactive with the ethylenically unsaturated monomer (i); and (iii) a second monomer reactive with ethylenically unsaturated monomer (i); and (b) a second acrylic polymer different from the first acrylic polymer, where the second acrylic polymer (b) has a Mw of at least 100,000 Da. A method of preparing such a coating composition and coatings and coated substrates formed therefrom are also disclosed. Coatings formed from the disclosed coating composition may exhibit improved stain resistance.

First claim

The invention claimed is:

1. A coating composition comprising:
(a) a first acrylic polymer formed from a reaction mixture comprising:
(i) an ethylenically unsaturated monomer comprising an acid group or an amine group;
(ii) a reactive solvent reactive with the ethylenically unsaturated monomer (i); and
(iii) a second monomer reactive with ethylenically unsaturated monomer (i); and

(b) a second acrylic polymer different from the first acrylic polymer, wherein the second acrylic polymer (b) has a Mw of at least 100,000 Da.

2. The coating composition of claim 1 , wherein a volatile organic content (VOC) of the coating composition is less than 50 g/L.

3. The coating composition of claim 1 , wherein the reactive solvent (ii) is completely consumed in an addition reaction with the ethylenically unsaturated monomer (i).

4. The coating composition of claim 1 , wherein the reactive solvent (ii) is ethylenically saturated and/or comprises oxirane functionality.

5. The coating composition of claim 1 , wherein the first acrylic polymer (a) has an average particle size of less than 0.5 microns.

6. The coating composition of claim 1 , wherein the coating composition is essentially free of a non-reactive organic solvent.

7. The coating composition of claim 1 , wherein the first acrylic polymer (a) comprises 5 to 50 percent by weight based on total solids of the first acrylic polymer (a) and the second acrylic polymer (b) in the coating composition.

8. The coating composition of claim 1 , wherein the ethylenically unsaturated monomer (i) comprises an ethylenically unsaturated acid functional monomer.

9. The coating composition of claim 1 , wherein the second acrylic polymer (b) comprises a latex acrylic polymer.

10. The coating composition of claim 1 , wherein the first acrylic polymer (a) has a Mw of up to 70,000 Da.

11. The coating composition of claim 1 , wherein the first acrylic polymer (a) has a Tg of from −50° C. to 100° C.

12. A coating formed from the coating composition of claim 1 , the coating exhibiting an improved stain resistance compared to a coating formed from the same coating composition not including the first acrylic polymer (a).

13. The coating of claim 12 , wherein the coating exhibits a stain rating of at least 45 according the Stain Resistance Test Method.

14. A substrate at least partially coated with a coating formed from the coating composition of claim 1 .

15. The substrate of claim 14 , wherein the substrate comprises an architectural component.

16. A method of preparing a coating composition for imparting improved stain resistance comprising:
reacting to form (a) a first acrylic polymer:
(i) an ethylenically unsaturated monomer comprising an acid group or an amine group;
(ii) a reactive solvent reactive with the ethylenically unsaturated monomer (i); and
(iii) a second monomer reactive with ethylenically unsaturated monomer (i); and

mixing (b) a second acrylic polymer different from the first acrylic polymer (a) with the first acrylic polymer (a) to form a coating composition, wherein the second acrylic polymer (b) has a Mw of at least 100,000.

17. The method of claim 16 , wherein the reactive solvent (ii) is ethylenically saturated and/or comprises oxirane functionality.

18. The method of claim 16 , wherein the first acrylic polymer (a) comprises 5 to 50 percent by weight based on total solids of the first acrylic polymer (a) and the second acrylic polymer (b) in the coating composition.

19. The method of claim 16 , wherein the ethylenically unsaturated monomer (i) comprises an ethylenically unsaturated acid functional monomer.

20. The method of claim 16 , wherein a volatile organic content (VOC) of the coating composition is less than 50 g/L.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Wang Maria
• Mcgrane Katie L
• Swarup Shanti

Classifications

• C09D133/066 Primary

  containing -OH groups · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C09D133/068 Primary

  containing glycidyl groups · CPC title

• C09D133/062

  Copolymers with monomers not covered by C09D133/06 · CPC title

• C09D133/14

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title