Patent ID: 7858689

Claim:
A thermoplastic vulcanizate consisting of: (i) 50 parts by weight poly(butene-1) characterized by 0.35 MI, ASTM D-1238, 2.16 kg @ 190° F., 150 parts by weight polypropylene characterized by a 0.7 dg/min MFR, ASTM D-1238, 2.16 kg @ 230° F., 30 parts by weight white oil, 3 parts by weight methylhydrosiloxane-octylmethylsiloxane copolymer, and 4 parts by weight platinum catalyst consisting of 2.2 wt percent platinum zero metal in tetramethyltetravinylcyclotetrasiloxane solution, each based on 100 parts by weight poly(co-ethylene-co-propylene-5-vinyl-2-norbornene); (ii) where said thermoplastic vulcanizate is characterized by a tensile strength, ASTM D-412 23° C., of 13.8 and a Shore A hardness of 92; (iii) 100 parts by weight poly(ethylene-co-propylene-co-5-vinyl-2-norbornene) having 0.7 wt percent 5-vinyl-2-norborene and 63 wt percent ethylene; a Mooney viscosity, ML(1+4) @ 125° C., of 52, oil extended; an intrinsic viscosity in decalin of 5 dl/g; and a weight average molecular weight of 950 kg/mole; and (iv) 100 parts by weight white oil in combination with the poly(ethylene-co-propylene-co-5-vinyl-2-norbornene).