Patent ID: 7812093
Filing Date: 2010-10-12
Classification: C08L

Abstract:
1. A method of preparing a thermoplastic vulcanizate comprising: dynamically vulcanizing poly(ethylene-co-propylene-co-5-ethylidene-2-norbornen) rubber within a blend comprising 100 parts by weight of the rubber, about 15 to about 25 parts by weight polypropylene, from about 10 to about 250 parts by weight clay or carbon black, about 70 to about 200 parts by weight of an extender oil, and a single cure system consisting of an organic peroxide cure agent and from about 1 to about 12 parts by weight triallyl isocyanurate, wherein the single cure system is the only cure system, to thereby form a thermoplastic vulcanizate; where said step of dynamically vulcanizing cures the rubber to an extent where not more than 10 weight percent of the rubber is extractable by cyclohexane at 23° C. and where the thermoplastic vulcanizate can be formed into an extrudate that includes less crystalline bloom than can be detected without special optical magnification after 60 days.