US 11,986,854 B2
Automobile parts
Shinya Takata, Osaka (JP); Yumiko Hayashi, Osaka (JP); Emi Toriyama, Saitama (JP); and Ken Nakane, Saitama (JP)
Assigned to NIPPON PAINT AUTOMOTIVE COATINGS CO., LTD., Osaka (JP)
Appl. No. 17/278,925
Filed by NIPPON PAINT AUTOMOTIVE COATINGS CO., LTD., Osaka (JP)
PCT Filed Oct. 8, 2019, PCT No. PCT/JP2019/039595
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/075697, PCT Pub. Date Apr. 16, 2020.
Claims priority of application No. 2018-190944 (JP), filed on Oct. 9, 2018.
Prior Publication US 2021/0394228 A1, Dec. 23, 2021
Int. Cl. B05D 1/02 (2006.01); B05D 3/02 (2006.01); C09D 5/00 (2006.01); C09D 123/12 (2006.01); C09D 133/08 (2006.01)
CPC B05D 1/02 (2013.01) [B05D 3/0272 (2013.01); C09D 5/002 (2013.01); C09D 123/12 (2013.01); C09D 133/08 (2013.01); B05D 2400/00 (2013.01); B05D 2502/00 (2013.01); B05D 2507/02 (2013.01)] 4 Claims
 
1. An automobile part obtained by forming a coating film layer on a plastic material comprising a polypropylene resin composition modified with an elastomer component having a thickness of 1.5 to 2.5 mm,
wherein said coating film layer is a multilayer coating film obtained by coating and baking the following coating compositions in this order;
(a) an aqueous conductive primer coating composition having a single film tensile elongation of 5 to 35% at −20° C., and comprising a conductive agent, a white pigment, and a pigment dispersion resin, wherein the pigment dispersion resin is selected from the group consisting of an acid-modified polypropylene, an acid-modified chlorinated polyolefin, an epoxy resin, a polyurethane resin, an aqueous alkyd resin, and a water-soluble acrylic resin,
(b) a base coating composition containing a coloring agent and,
(c) a clear coating composition containing at least a linear acrylic polyol (c-1) with a hydroxyl value of 80 to 220 mgKOH/g, a crosslinked acrylic resin (c-2) containing 2 to 30 parts by weight of polyfunctional monomer (c-2-1) with 2 to 4 radically polymerizable unsaturated groups per a molecule and 98 to 70 parts by weight of monofunctional monomer (c-2-2) with one polymerizable unsaturated group as a constituent unit, and having a glass transition point of 70 to 120° C., and a curing agent (c-3), and
wherein the coating film layer has a Dupont impact strength of 4.9 J or more at −30° C.