Highly elastic thermoplastic elastomer composition

Abstract

A thermoplastic elastomer composition having superior compression set performance and moldability, comprising the following components (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in 0.5 g/dl of a chloroform solution at 30.degree. C.; and (d) a non-aromatic rubber softening oil, and the contents of said components (a), (b), (c) and (d) in the composition satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0.gtoreq.b/a.gtoreq.0 (1) 1.4.gtoreq.c/(a+b).gtoreq.0.1 (2) 3.0.gtoreq.d/(a+b).gtoreq.0.1 (3); and a method for producing the thermoplastic elastomer composition comprising melt kneading the components (a) to (d) described above. The composition is useful in the field of automobile parts, electric wire coatings, footwear, toys, sundry goods, etc.

Dependencies are inferred from the claim text.