US 12,187,913 B2
Coating composition
Junchao Zheng, Shanghai (CN); Jianping Shen, Shanghai (CN); Hao Liu, Shanghai (CN); Ling Yang, Shanghai (CN); and Jinqi Li, Shanghai (CN)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 17/286,518
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Nov. 6, 2019, PCT No. PCT/EP2019/080333
§ 371(c)(1), (2) Date Apr. 19, 2021,
PCT Pub. No. WO2020/094689, PCT Pub. Date May 14, 2020.
Claims priority of application No. 201811322642.8 (CN), filed on Nov. 7, 2018; and application No. 18212557 (EP), filed on Dec. 14, 2018.
Prior Publication US 2021/0355347 A1, Nov. 18, 2021
Int. Cl. C09D 175/08 (2006.01); C08G 18/18 (2006.01); C08G 18/22 (2006.01); C08G 18/48 (2006.01); C08G 18/73 (2006.01); C09D 7/65 (2018.01)
CPC C09D 175/08 (2013.01) [C08G 18/18 (2013.01); C08G 18/222 (2013.01); C08G 18/4825 (2013.01); C08G 18/4837 (2013.01); C08G 18/73 (2013.01); C09D 7/65 (2018.01)] 18 Claims
 
1. A coating composition comprising:
(a) an isocyanate-reactive component consisting of:
(a1) at least one polyaspartic ester having an amino group equivalent of 200 to 500, and
(a2) optionally a polyetheraspartic ester having an amino group equivalent of 200 to 2500;
(b) an isocyanate component comprising:
(b1) at least one isocyanate prepolymer, the at least one isocyanate prepolymer being a reaction product of components comprising at least one aliphatic isocyanate and at least one polyether polyol, the at least one polyether polyol having a weight-average molecular weight of 400 to 6000 and the structure of formula I:
HO—R1n—H  I,
wherein R1 has one or more of the following structures:

OG Complex Work Unit Chemistry
n is an integer of 6 to 100,
an amount of the —R1n— structure is at least 40 wt % based on a weight of the polyether polyol; and
(b2) at least one isocyanate oligomer containing not less than two isocyanate groups,
a weight ratio of the at least one isocyanate prepolymer (b1) to the at least one isocyanate oligomer (b2) being greater than 1:4 and less than 4:1;
(c) a catalyst; and
(d) optionally an additive;
wherein a molar ratio of isocyanate groups to isocyanate-reactive groups in the coating composition is from 1.5:1 to 4:1, and
wherein the coating composition has a pot life of greater than or equal to 30 minutes.