| 摘要 |
A zirconia-based coating composition comprising a mixture obtained by mixing: (a) at least one compound selected from the group consisting of (a') a zirconium compound represented by the general formula (I): Zr(OR)4 (I) wherein R is an alkyl group having 2-5 carbon atoms or the general formula (I'): Zr(OR)4.ROH (I') wherein R has the same means as defined above, (a'') a partial hydrolyzate of the zirconium compound (a'), and (a''') a partial condensate of the partial hydrolyzate (a''), (b) a beta -diketone or beta -ketoester represented by the general formula (II): R1COOH2COR2 (II) wherein R1 is an alkyl group having 1-5 carbon atoms, R2 is an alkyl group having 1-5 carbon atoms or an alkoxy group having 1-4 carbon atoms), (c) water, and (d) a hydrophilic organic solvent. Said coating composition can form a transparent, very hard coating film on the surfaces of metals, inorganic building materials and plastics, can be hardened at low temperatures, can form a thick coating film, and can be recoated.
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