Room temperature vulcanizing one-component silicone rubber formulations containing a hydrophobic silica

摘要

PROBLEM TO BE SOLVED: To provide a one-component type silicone rubber preparation vulcanizable at a room temperature containing hydrophobic silica.;SOLUTION: The silicone rubber composition comprises 0.5-60 mass% hydrophobic silica having a carbon content of 3.1%, a methanol wetness of 60%, a reflectance of 94%, a BET/CTAB ratio of 1 and 3, a DBP absorption of 230 g/100 g, a BET surface area of 50-110 m²/g, a CTAB surface area of 30 m²/g, a water vapor absorption at 30°C under 30RH of 1.3 and a water vapor absorption at 30°C under 70RH of 1.7, and 40-99.5 mass% of an organopolysiloxane of the formula: Z_nSiR_3-n-O-[SiR₂O]_x-SiR_3-n-Z'_n (wherein the variations are as defined in Claims), and therefore, the following effect is obtained: in vulcanizing a silicon rubber, a high reinforcing effect as well an extraordinary low water absorption, a high whiteness and a high accurate control can be attained, and further, a storage stable rheological property can also be attained.;COPYRIGHT: (C)2003,JPO