Other

Honda Giken Kogyo Kabushiki Kaisha

Nippon Bee Chemical Co., Ltd.

Makoto Hashimoto

Takeshi Ogawa

Yasuhiko Ogisu

Hiroshi Watarai

Katsuo Miyazaki

Yasuhiro Nakano

A paint composition for use in a resin molding product prevents the appearance of coating film sink marks caused by unevenness of the coated surface by incorporating a coloring pigment and an extender pigment into the paint composition. The coloring and extender pigments are present in the paint composition in a total pigment weight concentration (PWC) of less than 30%.

Paint composition for use with resin molding products

The present invention provides a primer composition for polyolefins which has sufficient adhesion to polyolefin base materials and excellent resistance to gasohol and high pressure washing of cars. This primer composition for polyolefins comprises: acid anhydride-modified polypropylene chloride (A), which includes polypropylene chloride moiety (a1) and acid anhydride moiety (a2) as bonded thereto, and has a chlorine content of 19.5 to 20.5 wt %, an acid anhydride moiety content of 0.8 to 1.2 wt %, and a weight-average molecular weight of 30,000 to 36,000; and acryl-modified polypropylene chloride (B), which includes polypropylene chloride moiety (b1) and acrylic polymer chain moiety (b2) as grafted thereon, and has a weight-average molecular weight of 30,000 to 200,000, wherein: polypropylene chloride moiety (b1) has a chlorine content of 20 to 30 wt %; acrylic polymer chain moiety (b2) has a glass transition temperature of 60.degree. C. or higher; and the ratio by weight between moieties (b1) and (b2) is b1/b2 =5/95 to 50/50; wherein the ratio by weight between acid anhydride-modified polypropylene chloride (A) and acryl-modified polypropylene chloride (B) is A/B=90/10 to 20/80.

Primer composition for polyolefins

Growing community of inventors

Hirakata, Japan

Makoto Hashimoto