VULCANIZABLE RUBBER COMPOSITION FOR LIQUEFIED GAS SEALANT AND LIQUEFIED GAS SEALANT

摘要

A vulcanizable rubber composition for liquefied gas sealant, comprising a nitrile-group-containing highly saturated copolymer rubber obtained by hydrogenation of carbon-carbon unsaturated bonds of an unsaturated nitrile/conjugated diene copolymer and, per 100 pts.wt. thereof, 10 to 150 pts.wt. of reinforcer composed of carbon black and/or silica, 10 to 100 pts.wt. of calcium carbonate and 0.1 to 10 pts.wt. of organic peroxide, wherein the content weight ratio of reinforcer to calcium carbonate is in the range of 0.5 to 5. This vulcanizable rubber composition would give a vulcanizate excelling in fluorohydrocarbon resistance, being low in compression set and excelling in mechanical strength.