THERMOPLASTIC ELASTOMER COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a new thermoplastic elastomer composition which has flexibility and further has excellent formability, rubbery characteristics, mechanical strengths, compression permanent set and transparency. SOLUTION: This thermoplastic elastomer composition comprises (A) an isobutylene block copolymer comprising (a) a polymer block consisting mainly of isobutylene and (b) a polymer block consisting mainly of an aromatic vinyl compound, and (B) a modified isobutylene block copolymer which is a block copolymer comprising (a) a polymer block consisting of isobutylene and (b) a polymer block consisting of an aromatic vinyl compound and having hydrolysable group or hydroxyl group-bound silicone groups at the terminals.