Patent ID: 8415428
Filing Date: 2013-04-09
Classification: C08F,C08L

Abstract:
1. A thermoplastic elastomer composition obtained by dynamically crosslinking, under a melting condition, 100 parts by mass of a block copolymer (I), 1 to 1,000 parts by mass of a polar resin (II), 1 to 500 parts by mass of a modified polymer (III), and 0.01 to 50 parts by mass of a crosslinking agent (IV), wherein the block copolymer (I) is a hydrogenated block copolymer obtained by hydrogenation reaction of a non-hydrogenated block copolymer, wherein the block copolymer (I) comprises at least one polymer block (A) comprising as a main component polymerized alkylene units, and/or at least one copolymer block (B) comprising as a main component copolymerized alkylene units (b-1) and a vinyl aromatic monomer units (b-2), and comprises at least one unsaturated block (C) comprising as a main component polymerized conjugated diene monomer units having 5 or more carbon atoms at an end; wherein the block copolymer (I) further comprises at least one polymer block (D) comprising as a main component polymerized vinyl aromatic monomer units at each of both ends, wherein the at least one unsaturated block (C) is internally bonded to the at least one polymer block (D), and the at least one polymer block (D) is an outermost polymer block, wherein the degree of hydrogenation of the double bond of the conjugated diene monomer unit having 5 or more carbon atoms in the unsaturated block (C) is 40% or less, and wherein a content of the unsaturated block (C) in the block copolymer (I) is from 0.1 to 20% by mass.