US 7,838,076 B2
Kansai Paint Co., Ltd. has received a patent for a thermosetting aqueous paint comprised of a polyester resin (A-2) and a crosslinking agent (B), wherein the polyester resin (A-2) has a hydroxyl value within the range of 10 to 300 mgKOH/g, an acid value within the range of 10 to 100 mgKOH/g, and a number average molecular weight within the range of 400 to 6,000, and is a polyester resin obtained by reacting a polyvalent carboxylic acid and/or polyvalent carboxylic acid anhydride (a-3) and/or a polyisocyanate compound (a-4) with an oligomer (A-1), wherein the oligomer (A-1) has a hydroxyl value within the range of 30 to 500 mgKOH/g, an acid value within the range of 20 to 200 mgKOH/g, and a number average molecular weight within the range of 300 to 2,000, and is obtained by reacting a compound (a-1) having at least one hydroxyl group and at least one carboxyl group in a molecule thereof, and a monoepoxide compound (a-2) having a long-chain hydrocarbon group, and wherein the number average molecular weight of the polyester resin (A-2) is larger than that of the polyester oligomer (A-1) by 400 to 2,000.
Kansai patents thermosetting aqueous paint
Published February 15, 2012
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