| 摘要 |
PURPOSE: Provided is a vulcanizing envelope rubber composition which comprises, as rubber material, brominated isobutylene/p-methylstyrene and has improved various physical properties and heat resistance. CONSTITUTION: The composition comprises brominated isobutylene/p-methylstyrene(BIMS) copolymer, as rubber material. The content of BIMS is 60 wt% or more with respect to 100 wt% of the rubber material. Particularly, the rubber composition comprises 100 phr of rubber material consisting of 40 phr of general butyl rubber and 60 phr of BIMS copolymer, and 5.0 phr of activator, 55.0 phr of reinforcing agent, 10.0 phr of processing agent, 1.0 phr of anti-aging agent, 1.0 phr of stearic acid, and 10.0 phr of SP-1045. |
