| 摘要 |
PROBLEM TO BE SOLVED: To obtain an organic-solvent-soluble copolymer which is excellent in insulation properties, resistances to heat and oxidation, weatherability, etc., and is useful especially for interlayer insulation materials by reacting a hydrogenated octasilsesquioxane with a divinyl compound in a specified ratio in the presence of a hydrosilylation catalyst. SOLUTION: One mol of a hydrogenated octasilsesquioxane represented by the formula is reacted with a divinyl compound represented by CH2=CH-L- CH=CH2 [wherein L is a 3-10C divalent hydrocarbon group or -(SiR2O)m-SiR2- (wherein m is 1-10; and R is a 1-6C alkyl or 6-9C aryl)] in an amount of 0.2 mol or higher but lower than 3 mol in the presence of a hydrosilylation catalyst preferably in a molar ratio to the vinyl groups of the divinyl compound of 1/100,000-1/100. Examples of the catalyst are platinum chloride, chloroplatinic acid, a platinum-olefin complex, a platinum-phosphine complex, a platinum- vinylsiloxane complex, and the solutions of these compounds.
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