	US 12,460,104 B2
	Two-component waterborne polyurethane coating composition and low gloss coating formed therefrom
Yanchang Gan, Foshan (CN); Shigang Fan, Foshan (CN); and Xi Zhao, Foshan (CN)
Assigned to SHERWIN-WILLIAMS (GUANGDONG) NEW MATERIAL CO., LTD., Gunagdong (CN)
Appl. No. 17/413,005
Filed by GUANGDONG HUARUN PAINTS CO., LTD, Foshan (CN)
PCT Filed Dec. 19, 2019, PCT No. PCT/CN2019/126608 § 371(c)(1), (2) Date Jun. 11, 2021, PCT Pub. No. WO2020/125714, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 201811570831.7 (CN), filed on Dec. 21, 2018.
Prior Publication US 2022/0064479 A1, Mar. 3, 2022
Int. Cl. C09D 175/14 (2006.01); C08G 18/62 (2006.01); C08G 18/73 (2006.01); C09D 7/42 (2018.01)

CPC C09D 175/14 (2013.01) [C08G 18/6229 (2013.01); C08G 18/73 (2013.01); C09D 7/42 (2018.01)]

14 Claims

1. A two-component waterborne polyurethane coating composition comprising:

a film-forming resin composition, comprising an aqueous dispersion of hydroxyl acrylic polymer particles with a core-shell structure; and

a polyisocyanate crosslinker,

wherein the hydroxyl acrylic polymer particles with a core-shell structure comprise a shell formed by a copolymer A and an inner core formed by a copolymer B; and

wherein the copolymer A has a glass transition temperature ranging from −20° C. to 60° C., the copolymer B has a glass transition temperature ranging from 20° C. to 100° C., and the hydroxyl acrylic polymer particles with a core-shell structure have a glass transition temperature ranging from 0° C. to 25° C.