Patent ID: 7964672

Claim:
A high strength thermoplastic vulcanizate composition consisting of: (a) an at least partially-cured ethylene-propylene-diene rubber, and an elastomeric propylene copolymer, wherein the elastomeric propylene copolymer has 60 wt % or more units derived from propylene, includes isotactically arranged propylene derived sequences, and has a heat of fusion of less than 45 J/g; (b) a polypropylene having a heat of fusion greater than 45 J/g; (c) a thermoplastic modifier functionalized having from 0.2 to 5 wt % polar moieties; (d) 20 wt % to 70 wt % of a filler selected from the group consisting of aluminum trihydroxide, magnesium dihydroxide, antimony trioxide, and combinations thereof; and (e) an additive oil in an amount of from 5 to 300 parts by weight rubber; and less than 1.0 wt % by weight of the composition of carbon black; with the proviso that the thermoplastic vulcanizate includes 10 to 40 wt. % of the ethylene-propylene-diene rubber, 10 to 35 wt. % of the elastomeric propylene copolymer, 2 to 20 wt. % of the polypropylene, and wherein the high strength thermoplastic vulcanizate composition has a Shore A hardness of 90 or more and a 100% Modulus measured parallel to the flow direction of at least 7.5 MPa and a 100% Modulus measured perpendicular to the flow direction of at least 6.0 MPa.