Silicone rubber composition for fluorocarbon resin-coated fixing rolls and fluorocarbon resin-coated fixing rolls

摘要

Silicone rubber composition for the formation of the silicone rubber layer in fluorocarbon resin-covered fixing rolls in which a fluorocarbon resin layer is placed over the circumference of a roll shaft with a silicone rubber layer interposed between the fluorocarbon resin layer and the roll shaft, wherein the silicone rubber composition comprises (A) 100 weight parts straight-chain polydiorganosiloxane that contains at least 2 silicon-bonded alkenyl groups in each molecule, (B) 5 to 500 weight parts inorganic filler, (C) 0.005 to 5 weight parts cyclic polydiorganosiloxane that contains at least 2 silicon-bonded alkenyl groups in each molecule, (D) polyorganosiloxane that contains at least 2 silicon-bonded hydrogen atoms in each molecule, in a quantity that affords a value from 0.1 to 10 for the molar ratio of silicon-bonded hydrogen in component (D) to the total alkenyl in components (A) and (C), and (E) platinum catalyst in a catalytic quantity. Also, a fluorocarbon resin-covered fixing roll characterized in that the silicone rubber layer is formed by the cure of the above-described silicone rubber composition.