US 12,378,435 B2
Weatherable and durable coating compositions
Steven Swier, Midland, MI (US); Gary M. Wieber, Midland, MI (US); Erin B. Vogel, Midland, MI (US); John B. Horstman, Midland, MI (US); and Susan M. Machelski, Midland, MI (US)
Assigned to Dow Global Technologies LLC, Midland, MI (US); and Dow Silicones Corporation, Midland, MI (US)
Appl. No. 17/775,918
Filed by Dow Global Technologies LLC, Midland, MI (US); and Dow Silicones Corporation, Midland, MI (US)
PCT Filed Nov. 12, 2020, PCT No. PCT/US2020/060078
§ 371(c)(1), (2) Date May 11, 2022,
PCT Pub. No. WO2021/113042, PCT Pub. Date Jun. 10, 2021.
Claims priority of provisional application 62/944,005, filed on Dec. 5, 2019.
Prior Publication US 2022/0380626 A1, Dec. 1, 2022
Int. Cl. C09D 183/00 (2006.01); C09D 133/08 (2006.01); C09D 183/08 (2006.01)
CPC C09D 183/08 (2013.01) [C09D 133/08 (2013.01)] 11 Claims
 
1. A curable coating composition comprising:
(1) an amino-functional silicone resin comprising in polymerized form, structural units of:
(i) (R3SiO1/2)a;
(ii) (R2Si(OR′)xO(2-x)/2)b;
(iii) (RSi(OR′)y,O(3-y)/2)c; and
(iv) (Si(OR′)zO(4-z)/2)d
wherein each R′ is hydrogen, an alkyl group or a functionalized alkyl group, provided that at least 5 mole percent of all R′ groups are amine containing groups of the formula: —Ra—NHRb;
wherein Ra is an alkyl group or an aryl-containing group derived from an amino alcohol and Rb is hydrogen, an alkyl group, or an aryl group;
wherein a+b+c+d=1.00 (100 mole percent); x is either 0 or 1; y is either 0, 1 or 2; and z is either 0, 1, 2, or 3;
wherein each R is independently hydrogen, an alkyl group, or an aryl group; and
the —NH— equivalent mass of the amino-functional silicone resin is from 50 to 750; and
(2) an acrylic copolymer which has, in polymerized form, epoxy functionalized groups and cure compatibility groups; and
wherein the coating composition has a molar ratio of amine NH functionality to epoxy functionality in the range of from 0.5 to 1.3;
wherein the epoxy functionalized groups of the acrylic copolymer are derived from one or more monomers selected from the group of glycidyl methacrylate (GMA), glycidyl acrylate, and mixtures thereof; and
wherein the acrylic copolymer has an epoxy equivalent weight (EEW) in the range of 200-600.