Patent ID: 8796378

Claim:
An elastomer composition comprising a butyl-based rubber (A), as a dispersed phase, including (i) a brominated isobutylene and p-methylstyrene copolymer rubber or (ii) a blend of at least one rubber selected from a butyl rubber, halogenated butyl rubber and polyisobutylene rubber and a brominated isobutylene and p-methylstyrene copolymer rubber and a Nylon resin (B), as a matrix phase, at least one member selected from Nylon 11, Nylon 6/66 copolymer, Nylon 6 and Nylon 66, and any blend thereof, wherein the matrix phase of the butyl-based rubber/Nylon resin blend composition has titanium oxide (C) compounded therein in an amount of 2.5 to 8% by weight, based upon the weight of the Nylon resin (B), wherein said titanium oxide (C) is first mixed with the Nylon resin (B), followed by being mixed with the butyl-based rubber, whereby the titanium oxide (C) is compounded in the matrix phase of the Nylon resin (B) in the elastomer composition.