US 11,732,154 B2
Coating composition and method for forming multilayer coating film
Yasunori Miwa, Hirakata (JP); Takuhiro Kakii, Hirakata (JP); Takanori Inazumi, Hirakata (JP); Katsumi Mizuguchi, Hirakata (JP); Hiroshi Iida, Hirakata (JP); and Takuma Okada, Hirakata (JP)
Assigned to NIPPON PAINT AUTOMOTIVE COATINGS CO., LTD., Osaka (JP)
Appl. No. 16/766,882
Filed by NIPPON PAINT AUTOMOTIVE COATINGS CO., LTD., Osaka (JP)
PCT Filed Nov. 30, 2018, PCT No. PCT/JP2018/044312
§ 371(c)(1), (2) Date May 26, 2020,
PCT Pub. No. WO2019/107570, PCT Pub. Date Jun. 6, 2019.
Claims priority of application No. 2017-231995 (JP), filed on Dec. 1, 2017.
Prior Publication US 2021/0363375 A1, Nov. 25, 2021
Int. Cl. B05D 1/36 (2006.01); B05D 1/38 (2006.01); C09D 133/14 (2006.01); C09D 133/06 (2006.01); C09D 7/63 (2018.01); C09D 7/62 (2018.01); B05D 7/00 (2006.01); C08G 18/54 (2006.01); C08G 18/73 (2006.01); C08G 18/80 (2006.01); C08K 3/36 (2006.01); C08K 5/5419 (2006.01); C08K 9/08 (2006.01); C08L 35/06 (2006.01); C08L 61/28 (2006.01); C09D 161/28 (2006.01); C09D 175/04 (2006.01)
CPC C09D 133/066 (2013.01) [B05D 7/532 (2013.01); B05D 7/572 (2013.01); C08G 18/544 (2013.01); C08G 18/73 (2013.01); C08G 18/80 (2013.01); C08K 3/36 (2013.01); C08K 5/5419 (2013.01); C08K 9/08 (2013.01); C09D 7/62 (2018.01); C09D 7/63 (2018.01); B05D 2202/10 (2013.01); B05D 2425/01 (2013.01); C08K 2201/003 (2013.01); C08K 2201/011 (2013.01); C08L 35/06 (2013.01); C08L 61/28 (2013.01); C08L 2201/52 (2013.01); C09D 161/28 (2013.01); C09D 175/04 (2013.01)] 11 Claims
 
1. A coating composition consisting essentially of:
a hydroxyl group-containing acrylic resin (A);
a melamine resin (B1);
a half-ester group-containing copolymer (C) that is a copolymer of a polymerizable unsaturated monomer (a) having a half-esterified acid anhydride group and another copolymerizable monomer (b); and
a blocked isocyanate compound (D),
wherein
the polymerizable unsaturated monomer (a) has an acid anhydride group half-esterified with a monoalcohol having 1 to 8 carbon atoms, and
a total acid value of the half-ester group-containing copolymer (C) is 5.0 mgKOH/g or more and 240 mgKOH/g or less.