US 12,312,490 B2
Waterborne, UV curable coating composition for easy-clean coatings
Zheng Shi, Shanghai (CN); Quan James Huang, Zhejiang (CN); Puxin Fang, Zhejiang (CN); Hong Lin, Guangdong (CN); and Junbiao Lu, Shanghai (CN)
Assigned to Akzo Nobel Coatings International B.V., Amsterdam (NL)
Appl. No. 17/768,542
Filed by Akzo Nobel Coatings International B.V., Amsterdam (NL)
PCT Filed Oct. 13, 2020, PCT No. PCT/EP2020/078708
§ 371(c)(1), (2) Date Apr. 13, 2022,
PCT Pub. No. WO2021/074113, PCT Pub. Date Apr. 22, 2021.
Claims priority of application No. PCT/CN2019/111254 (WO), filed on Oct. 15, 2019; and application No. 19207920 (EP), filed on Nov. 8, 2019.
Prior Publication US 2024/0034906 A1, Feb. 1, 2024
Int. Cl. C09D 175/16 (2006.01); C08G 18/08 (2006.01); C08G 18/34 (2006.01); C08G 18/50 (2006.01); C08G 18/66 (2006.01); C09D 7/20 (2018.01); C09D 7/65 (2018.01); C09D 175/08 (2006.01); C09D 175/14 (2006.01)
CPC C09D 175/16 (2013.01) [C08G 18/0823 (2013.01); C08G 18/348 (2013.01); C08G 18/5015 (2013.01); C08G 18/6692 (2013.01); C09D 7/20 (2018.01); C09D 7/65 (2018.01); C09D 175/08 (2013.01); C09D 175/14 (2013.01)] 11 Claims
 
1. A waterborne, UV curable coating composition, comprising an aqueous dispersion of a polyurethane and at least one non-fluorinated polymer different from the polyurethane, wherein the polyurethane is present as an additive in an amount 0.1-5 wt. % based on resin solids of the coating composition, and wherein the polyurethane is a carboxyl-functional, unsaturated polyurethane containing a perfluoropolyether block, said polyurethane having a molecular weight Mn in the range from 1,000 to 5,000 determined by gel permeation chromatography with a polystyrene standard and tetrahydrofuran as the mobile phase, said polyurethane prepared by a method comprising the following steps:
a) subjecting a hydroxy-terminated perfluoropolyether A to a reaction with a molar excess of polyisocyanate B to obtain an isocyanate-functional urethane,
b) subjecting the isocyanate-functional urethane to a reaction with a carboxyl-functional polyol D to obtain an isocyanate-functional polymer,
c) subjecting the isocyanate-functional polymer obtained in step b) to a reaction with a mono-OH-functional (meth)acrylate monomer E,
d) neutralizing the reaction product of step c) with a neutralizer G to obtain a neutralized polyurethane,
e) dispersing the neutralized polyurethane obtained in step d) in water;
and wherein the method does not include chain extension with a diamine or a diol after dispersing the neutralized polyurethane in water.