Top coating composition

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 201/06 (2006.01) C09D 133/06 (2006.01) C09D 151/00 (2006.01) C09D 167/00 (2006.01) C08L 61/20 (2006.01) C08L 67/02 (2006.01)

Patent

CA 1336304

This invention relates to a top coating composi- tion comprising (A) a low molecular weight polyol resin having a weight average molecular weight in the range of about 400 to about 2,000 with a molecular weight distribution in terms of the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) being not more than about 1.6, and having a hydroxyl value in the range of about 150 to about 400 mg KOH/g, (B) at least one polyol resin selected from the group consisting of (1) a polyester polyol having a weight average molecular weight of about 2,000 to about 50,000, a hydroxyl value of about 50 to about 200 mg KOH/g, and a cyclohexylene ring content not less than about 7 percent by weight, (2) an acrylic polyol resin containing about 20 to about 60 percent by weight of acrylic and/or methacrylic ester of a monohydric alcohol of 6 to 18 carbon atoms and having a weight average molecular weight of about 5,000 to about 50,000 and a hydroxyl value of about 50 to about 180 mg KHO/g, and (3) a mixed polyol resin consisting of a non- aqueous dispersion type acrylic resin prepared by dispersion-polymerizing at least one vinyl monomer in the presence of a polymer dispersion stabilizer and an organic solvent and a solution type acrylic polyol resin having a weight average molecular weight of about 5,000 to about 50,000 and a hydroxyl value of about 50 to about 180 mg KOH/g, and (C) an alkoxy monomeric melamine, wherein (A) component accounts for about 15 to about 60 percent by weight, (B) component about 15 to 60 percent by weight, and (C) component about 20 to about 50 percent by weight based on the total weight of (A) to (C) components.

573817

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