AUTOMOTIVE WEATHER SEALS FORMED WITH THERMOPLASTIC VULCANIZATE COMPOSITIONS

摘要

Profiles or articles such as automotive seals (e.g., door seals and trunk seals) formed with foamed TPVs can comprise a thermoplastic polyolefin (e.g., polypropylene) and an ethylene-a-olefin-diene terpolymer, which imparts improved elastic properties. The sealing profile can comprise a foamed thermoplastic vulcanizate composition comprising a thermoplastic polyolefin and an ethylene-a-olefin-diene terpolymer elastomer, wherein the ethylene-a-olefin-diene terpolymer elastomer has a weight-average molecular weight Mw of from 200,000 g/mol to 3,000,000 g/mol, a Mw/Mn of 4.0 or lower, and a g'vis of 0.90 or greater, wherein the foamed thermoplastic vulcanizate composition has a specific gravity of 0.2 to 0.9.