Patent ID: 8207270

Claim:
A thermoplastic vulcanizate composition comprising a thermoplastic consisting of at least one polyproylene, a dispersed phase consisting of a dynamically-cured ethylene-propylene-diene rubber, a disodium salt of rel-(1R,2R,3S,4S)-bicyclo[2.2.1]heptane-2,3-dicarboxylic acid crystallization agent, a curative consisting essentially of a cure agent and a curing coagent, and filler consisting of clay and carbon black, wherein the thermoplastic vulcanizate composition exhibits a crystallization temperature (Tc) at least 6° C. greater than that of the thermoplastic composition vulcanizate absent the crystallization agent, wherein the thermoplastic vulcanizate is prepared within an extruder by dynamically vulcanizing the rubber with the curative that is added to the extruder and wherein the crystallization agent is added to the extender downstream of the curative to thereby produce the thermoplastic vulcanizate having a degree of cure where not more than 10 wt. % of the rubber is extractable by cyclohexane at 23° C., where the thermoplastic vulcanizate demonstrates a weight gain of less than or equal to 71.3% when immersed in oil for 24 hours at 121° C. in accordance with ASTM D471 and ISO 1817, and a compression set of less than or equal to 51.1% after compression for 22 hours at 70° C. in accordance with ISO815:1991.