Halogenated isobutylene copolymer elastomer composition containing silica reinforcement and an organo phosphite and article of manufacture, including a tire, having at least one component comprised of such elastomer composition

This invention relates to a rubber composition comprised of a halogenated (e.g. brominated) copolymer of isobutylene and p-methyl styrene elastomer reinforced with synthetic particulate silica-based reinforcement together with an organo phosphite to aid in enhancing the silica reinforcement of the halogenated isobutylene copolymer elastomer. Preferably, the rubber composition is comprised of a combination of a brominated copolymer of isobutylene and p-methyl styrene and at least one diene-based elastomer. The invention further relates to an article of manufacture, including a tire, having at least one component comprised of such rubber composition.