Patent ID: 6861471

Claim:
A coating composition for polyolefin resins, comprising a resin obtained by graft-copolymerizing at least one member selected from the group consisting of an α,β-unsaturated carboxylic acid and an acid anhydride thereof with at least one member selected from the group consisting of polypropylene and a propylene-α-olefin copolymer, chlorinating the graft copolymer to give an acid-modified chlorinated polyolefin, heating the polyolefin to convert carboxyl groups into an acid anhydride group, linking the acid anhydride group with the hydroxyl group of a hydroxyl-group-containing (meth)acrylic ester via an ester linkage, and then graft-copolymerizing (meth)acrylic acid monomers with the polyolefin.