Stain resistant, soft touch coating compositions and coatings formed therefrom

Patent metadata

Field	Value
Publication number	US-10487232-B2
Application number	US-201615580811-A
Country	US
Kind code	B2
Filing date	Jun 9, 2016
Priority date	Jun 9, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

A stain resistant, soft touch coating composition can include: (a) a fluoropolymer comprising at least one reactive functional group; (b) a polyester polyol; and (c) a crosslinker reactive with (a) and (b). The polyester polyol can include a reaction product obtained from a mixture of reactants including: an aliphatic diol; a polyol having 3 or more hydroxyl groups; and a cyclic polycarboxylic acid, or an anhydride or ester thereof.

First claim

The invention claimed is:

1. A coating composition comprising:
(a) a fluoropolymer comprising at least one reactive functional group;
(b) a polyester polyol comprising a reaction product prepared from a mixture of reactants comprising:
(i) an aliphatic diol;
(ii) a polyol comprising 3 or more hydroxyl groups; and
(iii) a cyclic polycarboxylic acid, or an anhydride or ester thereof; and

(c) a crosslinker reactive with (a) and (b),
wherein the polyol comprising 3 or more hydroxyl groups comprises at least 20 weight % of the mixture of reactants used to prepare the polyester polyol based on the total weight of the reactants.

2. The coating composition of claim 1 , wherein the cyclic polycarboxylic acid, or the anhydride or ester thereof, comprises at least 40 mole % of the total carboxylic acids, or anhydrides or esters thereof, used to prepare the polyester polyol.

3. The coating composition of claim 1 , wherein the fluoropolymer comprises a fluoroethylene/alkyl vinyl ether copolymer that comprises at least one reactive functional group.

4. The coating composition of claim 1 , wherein the at least one reactive functional group of the fluoropolymer comprises a hydroxyl group.

5. The coating composition of claim 1 , further comprising particles having an average particle size of up to 30 microns.

6. The coating composition of claim 4 , wherein the particles have an average particle size of 0.5 micron to 30 microns.

7. The coating composition of claim 1 , wherein the polyester polyol (b) comprises a hydroxyl value of greater than 200 mg KOH/g.

8. The coating composition of claim 1 , wherein the polyester polyol (b) comprises a hydroxyl value of at least 300 mg KOH/g.

9. The coating composition of claim 1 , wherein the polyester polyol (b) is completely free of polymerizable ethylenically unsaturated groups.

10. The coating composition of claim 1 , wherein the cyclic polycarboxylic acid, or the anhydride or ester thereof, comprises an aromatic cyclic polycarboxylic acid, or the anhydride or ester thereof.

11. The coating composition of claim 1 , wherein the molar ratio of hydroxyl group equivalents to carboxylic acid group equivalents of the reactants forming the polyester polyol is from 1.2:1 to 3.5:1.

12. The coating composition of claim 1 , wherein the polyester polyol is prepared with at least two different aliphatic diols.

13. The coating composition of claim 1 , wherein the aliphatic diol comprises a branched aliphatic diol.

14. The coating composition of claim 1 , wherein the polyester polyol has a weight average molecular weight of less than 10,000 g/mol as determined by gel permeation chromatography versus a polystyrene standard with tetrahydrofuran as an eluent.

15. The coating composition of claim 1 , wherein the crosslinker comprises a polyisocyanate.

16. The coating composition of claim 5 , wherein the coating composition comprises a weight ratio of the particles to the total of (a), (b), and (c) of 0.05:1 to 0.25:1.

17. The coating composition of claim 1 , further comprising a silicone component comprising at least one reactive functional group that is reactive with the crosslinker.

18. The coating composition of claim 17 , wherein the at least one reactive functional group of the silicone component comprises a hydroxyl group.

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

20. An electronic device or electronic component comprising a surface at least partially coated with a coating formed from the composition of claim 1 .

Assignees

• Ppg Ind Ohio Inc

Inventors

• Hensel Gereme Thomas
• Gao Renlong
• Schwendeman Irina G
• Saha Gobinda
• Shao Jiping
• Richman Courtney

Classifications

• C08G18/582

  having halogens · CPC title

• C08G18/4607

  having halogens · CPC title

• C08G18/4236

  containing only aliphatic groups · CPC title

• C08G63/12

  derived from polycarboxylic acids and polyhydroxy compounds · CPC title

• C08G18/4009 Primary

  Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64 · CPC title