Patent ID: 8420738

Claim:
A thermoplastic elastomer composition comprising a rubber component consisting of ethylene-propylene-diene rubber or/and butyl rubber; a crosslinking agent comprising a triazine derivative; 30 to 70 parts by mass of polypropylene or polyethylene for 100 parts by mass of the rubber component; at least 15 parts by mass of a softener for 100 parts by mass of the rubber component; and 30 to 40 parts by mass of hydrogenated styrene thermoplastic elastomer for 100 parts by mass of the rubber component, wherein said rubber component is dynamically crosslinked with said triazine derivative and dispersed in said polypropylene or said polyethylene, and wherein the triazine derivative is a compound of the following formula: wherein R denotes —SH, —OR 1 , —SR 2 , —NHR 3 or NR 4 R 5 , with R 1 , R 2 , R 3 , R 4 , and R 5 each denoting a C 1 -C 12 alkyl group, a C 1 -C 12 alkenyl group, a C 6 -C 14 aryl group, a C 7 -C 19 aralkyl group, a C 7 -C 19 alkylaryl group or a C 3 -C 9 cycloalkyl group, and with R 4 and R 5 being identical to each other or different from each other; and M 1 and M 2 are identical to each other or different from each other and denote H, Na, Li, K, ½Mg, ½Ba, ½Ca, an aliphatic primary amine, an aliphatic secondary amine, an aliphatic tertiary amine, a quaternary ammonium salt or a phosphonium salt.