| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compsn. which gives a cured film free of tacky feeling and excellent in abrasion resistance, insulating properties, etc., by compounding specific polyorganosiloxanes, a specific polymethylsilsesquioxane powder, fumed silica, and a platinum-base catalyst, each in a specified amt. SOLUTION: This compsn. comprises 100 pts.wt. polyorganosiloxane of formula I; 0.2-20 pts.wt. polyorganosiloxane of formula II; 100-500 pts.wt. polymethylsilsesquioxane powder having an average particle size of 1-10μm; 2-50 pts.wt. fumed silica having the surface hydrophobized with hexamethyldisilazane and having a BET specific surface area of 100-300 m<2> /g; and a platinum-base catalyst in an amt. of 1-100 ppm (in terms of platinum) based on the polyorganosiloxane of formula I. In the formulas, l is such a number that the viscosity of the polymer of formula I is 1,000-200,000 cP at 25 deg.C; R is H or CH3 ; m is 3-100; and n is 0-100.
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