Patent ID: 6599980
Filing Date: 2003-07-29
Classification: C08L,C09D,Y10T

Abstract:
An aqueous coating composition, which comprises:a) a resin emulsion A; b) a resin emulsion B; c) a polycarbodiimide crosslinking agent; and d) a resin powder; e) wherein said emulsion A comprises: a maleic-anhydride-modified chlorinated polypropylene resin emulsion that comprises a maleic-anhydride-modified chlorinated polypropylene resin which has a chlorine content of 15 to 25 weight % and a maleic anhydride modification amount of 1.0 to 5.0 weight %; f) wherein said emulsion B comprises: an acrylic resin emulsion that comprises an acrylic resin which is obtained by modifying a pure acrylic resin with the maleic-anhydride-modified chlorinated polypropylene resin of 0 to 30 weight % based on a total amount of acryl monomer component and maleic-anhydride-modified chlorinated polypropylene resin and has a glass transition temperature of not lower than 90Â° C.; g) wherein the nonvolatile solid content of the maleic-anhydride-modified chlorinated polypropylene resin emulsion is in the range of 10 to 30 weight %, the nonvolatile solid content of the acrylic resin emulsion is in the range of 40 to 65 weight %, and the nonvolatile solid content of the polycarbodiimide crosslinking agent is in the range of 5 to 25 weight %, based on an entirety of the nonvolatile solid content of the maleic-anhydride-modified chlorinated polypropylene resin emulsion, the acrylic resin emulsion, and the polycarbodiimide crosslinking agent; h) wherein the resin powder comprises polyurethane resin particles to enhance alkaline resistance and improve blister resistance; and i) wherein the content of the resin powder is in the range of 5 to 10 weight % of the nonvolatile solid content of the aqueous coating composition except the resin powder.