| 摘要 |
A coating composition is disclosed which includes (A) 15 to 65% by weight (calculated as SiO2) of colloidal silica, a partially hydrolyzed and partially co-condensed product of the following component (B) and component (C): (B) 10 to 80% by weight (calculated as R1Si(OH)3) of a trialkoxysilane of the formula: R1Si(OR2)3 wherein the group R1 is methyl or vinyl and the group R2 is alkyl having 1 to 4 carbon atoms, (C) 1 to 50% by weight (calculated as R3nSi(OH)4-n) of an acetoxysilane of the formula: R3nSi(OCOCH3)4-n wherein the group R3 is alkyl having 1 to 3 carbon atoms, vinyl, phenyl, or mercaptoalkyl having 1 to 3 carbon atoms, and n is an integer of 0 to 2, provided that the total amount of the component (B) wherein the group R1 is methyl and the component (C) wherein the group R3 is methyl and n is 1 is in the range of from 10% by weight to less than 70% by weight based on the whole amount of the components (B) and (C), and (D) a solvent. The composition is useful for coating plastic articles and metallic articles to improve their surface properties such as surface hardness, chemical resistance, etc.
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