US 11,851,573 B2
Solvent-borne coating compositions, coatings formed therefrom, and methods of forming such coatings
Yaqi Wo, Allison Park, PA (US); David R. Fenn, Allison Park, PA (US); Matthew S. Luchansky, Wexford, PA (US); Shanti Swarup, Allison Park, PA (US); Diane L. Wargo, Allison Park, PA (US); and Xiangling Xu, Pittsburgh, PA (US)
Assigned to PPG Industries Ohio, Inc., Cleveland, OH (US)
Appl. No. 17/290,214
Filed by PPG Industries Ohio, Inc., Cleveland, OH (US)
PCT Filed Nov. 1, 2019, PCT No. PCT/US2019/059325
§ 371(c)(1), (2) Date Apr. 29, 2021,
PCT Pub. No. WO2020/092868, PCT Pub. Date May 7, 2020.
Claims priority of provisional application 62/754,140, filed on Nov. 1, 2018.
Prior Publication US 2021/0403745 A1, Dec. 30, 2021
Int. Cl. C09D 133/08 (2006.01); C08F 222/10 (2006.01); C08F 220/18 (2006.01); B05D 7/00 (2006.01); C08F 220/06 (2006.01); C08F 220/20 (2006.01); C08K 5/3492 (2006.01); C08K 5/42 (2006.01); C08L 67/00 (2006.01); B05D 7/14 (2006.01)
CPC C09D 133/08 (2013.01) [B05D 7/542 (2013.01); C08F 220/06 (2013.01); C08F 220/1808 (2020.02); C08F 220/1811 (2020.02); C08F 220/20 (2013.01); C08F 222/102 (2020.02); C08K 5/34922 (2013.01); C08K 5/42 (2013.01); C08L 67/00 (2013.01); B05D 7/14 (2013.01)] 13 Claims
 
1. A coating composition comprising:
(a) a carboxylic acid functional polyol polymer comprising an acid value within a range of from 50 to 95 mg KOH/g and a hydroxyl value within a range of from 60 to 150 mg KOH/g;
(b) a melamine-formaldehyde crosslinker reactive with the carboxylic acid functional polyol polymer, wherein the melamine-formaldehyde crosslinker comprises imino and methylol groups that together comprise 35 mole % or less of the total functionality of the melamine-formaldehyde crosslinker, and wherein the melamine-formaldehyde crosslinker comprises butyl groups and isobutyl groups that together comprise 5 mole % or greater of the total functionality of the melamine-formaldehyde crosslinker;
(c) an acid catalyst;
(d) a non-aqueous liquid medium, and
(e) a polyester polyol;
wherein the coating composition cures at a temperature of 100° C. or less, and wherein when the composition is applied to a substrate and cured to form a cured coating, the cured coating demonstrates a solvent resistance of greater than 200 in methyl ethyl ketone double rubs test according to ASTM D5042-15.