| 摘要 |
A coating composition which comprises: (A) a resin having a glass transition temperature of 50 to 120 DEG 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 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 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) other polymerizable double bond-containing monomer, (B) at least one compound selected from the group consisting of a polyisocyanate compound having two or more isocyanate groups and/or blocked isocyanate groups in the molecule and an aminoplast resin, (C) a dispersing component of at least one inorganic oxide sol selected from the group consisting of an aluminium oxide sol, a silica sol, a zirconium oxide sol and an antimony oxide sol, wherein an amount of a nonvolatile matter of ingredient (C) is 5 to 60percent by weight based on a total nonvolatile matter of ingredient (A), ingredient (B) and ingredient (C), and a process for preparing a coating composition which comprises: preparing the resin (A), adding the dispersing component of an inorganic oxide sol (C) into a polymerization liquid containing the resin (A) after finishing of the copolymerization of the resin (A) to produce a organic-inorganic composite, and then mixing the organic-inorganic composite and ingredient (b). The coating compositions give the cured films having excellent weathering resistance, light resistance, stain resistance, stain-removing property, chemical resistance, moisture resistance and appearance and is excellent in environment friendliness and safety. |
