Patent ID: 8394892

Claim:
A thermoplastic elastomer composition comprising components (A), (B), (C), and (D); wherein the ratio of (B):(A) is from 1:1 to 1:10, the ratio of (C):(A) is from 1:2 to 2:1, the ratio of (D):(A) is from 1:20 to 3:10; wherein component (A) is a propylene polymer comprising from 70 to 95% by weight of component (A1) and from 30 to 5% by weight of component (A2), and wherein component (A1) is selected from the group consisting of: propylene homopolymer, propylene copolymer, and a mixture of propylene homopolymer and propylene copolymer, wherein the propylene copolymer comprises propylene units and monomer units, the monomer units being at least one of ethylene and an α-olefin having 4 or more carbon atoms, and containing 90% or more by weight of propylene units per 100% by weight of component (A1); and wherein component (A2) is an ethylene-α-olefin copolymer comprising from 20 to 50% by weight of ethylene units per 100% by weight of the component (A2); wherein component (B) is a crystalline propylene-ethylene copolymer consisting of from 70 to 97% by weight of propylene units (B1), and from 30 to 3% by weight of ethylene units (B2); wherein component (C) is an ethylene-α-olefin rubber comprising from 50 to 80% by weight of ethylene units (C1), and from 50 to 20% by weight of α-olefin units (C2); wherein the component (D) is a hydrogenated product of a block copolymer comprising from 15 to 40% by weight of aromatic vinyl compound units (D1), and from 85 to 60% by weight of conjugated diene compound units (D2), and wherein the weight average molecular weight of component (D) is 250,000 or more.