Patent ID: 8831499

Claim:
A toner fixing roll made by curing a thermally conductive silicone rubber sponge composition comprising 100 parts by weight of a heat-curable organopolysiloxane composition, 0.1 to 50 parts by weight of an organic resin hollow filler having an average particle diameter of up to 200 μm and a true specific gravity of up to 0.3, and 20 to 300 parts by weight of a thermally conductive filler having an average particle diameter of 1 to 30 μm and a thermal conductivity of at least 15 W/m·K, wherein the silicone rubber sponge obtained by curing said silicone rubber sponge composition has voids accounting for 10 to 70% of the entire volume thereof and has a thermal conductivity ranging from 0.15 to 0.35 W/m·K, and wherein the silicone rubber sponge obtained by curing said silicone rubber sponge composition has a heat capacity of up to 1.4 J/K, wherein said toner fixing roll is installed in an image forming apparatus of electrophotographic type.