Patent ID: 6890990

Claim:
A reactively modified thermoplastic elastomeric blend comprising at least one propylene resin and at least one ethylene/alpha-olefin/non-conjugated diene elastomer wherein the blend is dynamically vulcanized via a curing system comprising: a free radical initiator; a first co-agent comprising diene-containing polymers with a 1,2-vinyl content greater than about 50% by weight; and a second co-agent comprising multifunctional acrylates containing at least two acrylate groups, multifunctional maleimides containing at least two imide groups, or mixtures thereof; wherein the free radical initiator and the co-agents are collectively present in an amount sufficient to provide a gel content of the elastomer of at least 97% and to provide blends of the invention having a shore A durometer hardness of at least 70 with an oil swell of less than about 90% by weight, and blends having a shore A durometer hardness of no greater than 70 with an oil swell of less than about 100% by weight.