THERMOPLASTIC ELASTOMER COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a new thermoplastic elastomer composition which has rich flexibility, excellent formability and excellent compression permanent set. SOLUTION: This thermoplastic elastomer composition comprises (A) an isobutylene block copolymer comprising (a) an isobutylene polymer block having a silicone group bound to a hydrolysable group or hydroxyl group at the terminal and (b) a polymer block consisting mainly of an aromatic vinyl compound, and (B) an olefin resin. The composition preferably comprises 100 compound of the component (A) and 10 to 200 pts.wt. of the component (B). The composition is preferably cross-linked, when the components (A) and (B) are melted and kneaded.