Patent ID: 7909194

Claim:
An article for sealing the contents of a container, the article comprising: a member adapted for sealing the container, where the member comprises: a thermoplastic vulcanizate comprising: (i) a dynamically cured brominated butyl rubber dispersed within a continuous phase consisting essentially of a polyester-based or polyether-based thermoplastic polyurethane having a glass transition temperature of less than 60° C., (ii) from about 30 to about 40 parts by weight, per 100 parts by weight butyl rubber, of a synthetic oil selected from the group consisting of polyisobutylene, poly(isobutylene-co-butene), polybutadiene, and poly(butadiene-co-butene), and (iii) from about 5 to about 30 parts by weight, per 100 parts by weight of rubber, of carbon black, clay, or combination thereof, wherein: the thermoplastic vulcanizate includes: from about 20 to about 50 percent by weight thermoplastic polyurethane resin based on the weight of the butyl rubber component and thermoplastic polyurethane component combined, and wherein: the dynamically vulcanized butyl rubber is cured to an extent that not more than 5 weight percent of the rubber is extractable by cyclohexane at 23° C., the thermoplastic vulcanizate is characterized by: an LCR viscosity of less than 150 Pa@1,200 s −1 , an ACR viscosity of less than 4000 poise, an oxygen permeability of less than 500 cc/m·m·day, a compression set of less than 30%, and a coreability characterized by less than 5 cores per 100 punctures, and the thermoplastic vulcanizate includes less than 1% by weight mineral oils, and the thermoplastic vulcanizate is substantially devoid of a compatibilizer.