Patent ID: 6569536
Filing Date: 2003-05-27
Classification: C08G,C08K,C08L,G03G,Y10T

Abstract:
A thermoconductive liquid silicone rubber composition for fixing rolls comprising:(A) 100 parts by weight of a diorganopolysiloxane having at least two silicon bonded alkenyl groups per molecule, the diorganopolysiloxane being a liquid at room temperature; (B) 10-500 parts by weight of an alumina powder having an average particle size of not more than 10 &mgr;m and an ignition loss of not more than 0.15 weight percent, the ignition loss being determined according to the Ignition Loss Test Method of Japanese Industrial Standard (JIS) H 1901 conducted at a temperature of 1100Â° C. and using a heating time of one hour; (C) an organohydrogenpolysiloxane having at least two silicon bonded hydrogen atoms per molecule, the organohydrogenpolysiloxane being present in the composition in an amount such that the molar ratio between silicon bonded hydrogen atoms in component (C) and silicon bonded alkenyl groups in component (A) is 0.3:1 to 5:1; and (D) a platinum catalyst, the platinum catalyst being present in the composition in an amount such that there are 0.1-500 parts by weight of platinum metal atoms per 1,000,000 parts by weight of component (A); the thermoconductive liquid silicone rubber composition having a coefficient of thermal conductivity not less than 0.3 W/(mÂ·K) after the composition has been cured.