| 摘要 |
PURPOSE:To provide the titled compsn. having excellent storage stability and physical properties after curing, by blending a polyorganosiloxane with silica powder and two specified silicon compds. CONSTITUTION:100pts.wt. polyorganosiloxane (A) having at least one reactive group X per molecule, pref. at least one reactive group X at its terminals, represented by formula I [wherein R<1> is a (substd.) monovalent hydrocarbon group; X is a reactive group such as vinyl, hydroxyl, alkoxy, etc.; a is 1-2; b is 0-2; a+b=1-3] is blended with 1.0-200pts.wt. silica (B) having a specific surface area of 20-800m<2>/g (e.g., fumed silica), 0.05-100pts.wt. silicon compd. (C) of formula II (wherein R<2> and R<3> are each H or R<1>) selected from among trimethylsilanol, trimethylmethoxysilane and trimethylethoxysilane and 0.005-100 pts.wt. silicon compd. (D) of formula III (wherein R<4> is R2) selected from among hexamethyldisilazane, tetramethyldisilazane and 1,3-divinyltetramethyldisilazane. |
