Patent ID: 7507779

Claim:
A water-based paint composition comprising a polyolefin or modified polyolefin (A) and an ionic liquid (B), said modified polyolefin being selected from the group consisting of unsaturated carboxylic acid- or acid anhydride-modified polyolefins, acryl-modified polyolefins, chlorinated polyolefins and polyolefins modified by a combination of at least two of unsaturated carboxylic acid- or acid anhydride-modification, acryl-modification and chlorination; the polyolefin or modified polyolefin (A) having a ratio of weight-average molecular weight to number-average molecular weight (Mw/Mn) within a range of 1.5-7.0; the ionic liquid (B) being a molten salt; said composition further containing a hydroxyl containing resin (C) having a hydroxyl value within a range of 5-200 mgKOH/g within a range, in terms of weight ratio of solid component of polyolefin or modified polyolefin (A)/hydroxyl-containing resin (C), of 20/80-85/15, and a crosslinking agent (D); said composition also further containing as a vehicle component a urethane dispersion in the range of 5-50 wt % based on the combined solid contents of polyolefin or modified polyolefin (A), hydroxyl-containing resin (C) and crosslinking agent (D).