| 摘要 |
PROBLEM TO BE SOLVED: To improve mechanical strengths of a coating film to enable its formation having uniform thickness, hardly to generate cracks and to have a low dielectric constant by including a hydrolytic condensation product of two silane compounds. SOLUTION: A composition for forming a film is obtained by including a hydrolytic condensation product of (A) 100 pts.wt. (conversion into the fully hydrolytic condensation product) of a silane compound of the formula: (R1)aSi(OR2)4-a and 4-200 pts.wt. (conversion into the fully hydrolytic condensation product) of a silane compound of the formula: (R3)bSi(OR4)4-b. In the formulas, R1 is a monovalent group selected from methyl, ethyl, vinyl and phenyl; a is 0-2; R3 is a 4 or more C straight chain alkyl, branched chain alkyl or alicyclic alkyl; R4 is a monovalent organic group; and b is 1-2. The hydrolytic condensation product is obtained by hydrolyzing and/or condensing the components A and B under the presence of a catalyst and water in an organic solvent.
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