| abstract |
A thermoplastic vulcanizate comprising a dynamically cured rubber, and from about 20 to about 400 parts by weight of a thermoplastic resin per 100 parts by weight rubber, where said thermoplastic resin includes at least 0.1 percent by weight and less than 5.0 percent by weight, based upon the entire weight of said thermoplastic resin, of a long-chain branched polyolefin, with the remainder of said thermoplastic resin including a non-long-chain branched thermoplastic resin, where said long-chain branched polyolefin includes one or more polymers or copolymers having a viscosity average branching index <gN> vis of less than 0.9 and deriving from monomer selected from the group consisting of ethylene and mono-α-olefins, and where said non-long-chain thermoplastic resin includes one or more polymers or copolymers having a viscosity average branching index <gN> vis of 0.9 or more. |