Elastomeric compositions and their use in articles

摘要

A dynamically vulcanized alloy contains at least one isobutylene-containing elastomer and at least one thermoplastic resin, wherein the elastomer is present as a dispersed phase of small vulcanized or partially vulcanized particles in a continuous phase of the thermoplastic resin. The dynamically vulcanized alloy also contains an anhydride functionalized oligomer. The alloy maintains a high Shore A hardness value while obtaining improved flowability for processing.

主权项

1. A dynamically vulcanized alloy comprising the four following components:
a) at least one isobutylene-containing elastomer; b) at least one polar thermoplastic resin, c) an anhydride functionalized oligomer, wherein the oligomer, prior to functionalization, has a molecular weight in the range of 750 to 1250, and d) a plasticizer, the plasticizer comprising a component selected from the group consisting of tertiary amines, secondary diamines, and sulfonamides,wherein the anhydride functionalized oligomer and the plasticizer are present in the alloy in a ratio ranging from 0.3 to 1.5, andwherein the anhydride functionality of the oligomer is grafted to the polar thermoplastic resin and the elastomer is present as a dispersed phase of small vulcanized or partially vulcanized particles in a continuous phase of the thermoplastic resin.