Nippon Oil Fats Co., Ltd.

Fumio Sodeyama

Shosaku Yamamoto

Kazuo Kakinuma

Riichiro Maruta

Junji Mayumi

Hiroshi Ishioka

A primer composition usable for steel sheet and plastic sheet in vehicle bodies consists essentially of a component A composed of a resin obtained by graft-polymerizing a styrene-butadiene-styrene block copolymer or its hydrogenated polymer with .alpha.,.beta.-unsaturated carboxylic acid or its anhydride, a component B of a crosslinking agent and a component C of an epoxy compound, and has particular weight ratios as solid content of component A to component B and components A+B to component C.

Primer compositions

A primer composition usable for steel sheet and plastic sheet in vehicle bodies consists mainly of a polycaprolactone graft polymer obtained by graft-polymerizing a styrene-butadiene-styrene block copolymer or its hydrogenated polymer with a ring-opened polymer of .epsilon.-caprolactone and having a grafting ratio of the ring-opened polymer within a range of 0.5.about.50% by weight.

Growing community of inventors

Chigasaki, Japan

Fumio Sodeyama