RUBBER COMPOSITION COMPRISING MODIFIED FILLER

摘要

The present invention is directed to peroxide curable rubber compositions, processes for their preparation, and modified fillers therefor. The compositions contain one or more polymers having repeating units derived from one or more isoolefin monomers (e.g. isobutene) and repeating units derived from one or more multiolefin monomers (e.g. isoprene). The compositions also contain modified fillers comprising a particulate composite of a particulate filler (e.g. carbon black) and a multiolefin crosslinking agent (e.g. divinylbenzene). Such rubber compositions find application particularly in condenser caps, biomedical devices, pharmaceutical devices (e.g. stoppers in medicine-containing vials, plungers in syringes, etc.), and seals for fuel cells.