Patent ID: 6022919
Filing Date: 2000-02-08
Classification: C08G,C08L,C09D,Y10T

Abstract:
A coating composition which comprises:(A) a resin having a glass transition temperature of 50 to 120.degree. C., a number average molecular weight of 2,000 to 100,000, a hydroxyl value of 50 to 150 mgKOH/g and an acid value of 1 to 25 mgKOH/g, which is produced by copolymerizing monomers comprising 10 to 90 percent by weight of (a) a (meth)acrylic acid ester of an alkyl alcohol of 1 to 12 carbon atoms, 10 to 50 percent by weight of (b) a first polymerizable double bond-containing and hydroxyl group-containing monomer, 0.1 to 10 percent by weight of (c) a polymerizable double bond-containing and carboxyl group-containing monomer, 0 to 20 percent by weight of (d) styrene, 0 to 20 percent by weight of (e) acrylonitrile and 0 to 10 percent by weight of (f) a second polymerizable double bond-containing monomer,(B) at least one compound selected from the group consisting of (i) a polyisocyanate compound having two or more isocyanate groups selected from the group consisting of blocked isocyanate groups, unblocked isocyanate groups and a combination of blocked isocyanate groups and unblocked isocyanate groups, in the molecule and (ii) an aminoplast resin,(C) a dispersing component of at least one inorganic oxide sol selected from the group consisting of an aluminum oxide sol, a silica sol, a zirconium oxide sol and an antimony oxide sol, wherein the dispersing component has an amount of nonvolatile matter of 5 to 60 percent by weight based on a total amount of nonvolatile matter of the resin (A), the compound (B) and the dispersing component (C),when the compound (B) is said polyisocyanate, a mole ratio of said isocyanate groups in said polyisocyanate to hydroxyl groups in said resin (A) is 0.6 to 1.6, when the compound (B) is said aminoplast resin, a weight ratio of nonvolatile matter in said resin (A) to said compound (B) is 97:3 to 60:40.