Patent ID: 7411017
Filing Date: 2008-08-12
Classification: C08K,C08L

Abstract:
1. A thermoplastic elastomer comprising a rubber (A) which is partially or all crosslinked, an isotactic polypropylene (B) having an isotactic pentad ratio of 0.8 or more, a syndiotactic polypropylene (C) having a syndiotactic pentad ratio of 0.6 or more and a softener (D), wherein the syndiotactic polypropylene (C) is contained in an amounts of 0.5 to 10% by weight based on 100% by weight of the total amount of the crosslinked rubber (A), isotactic polypropylene (B), syndiotactic polypropylene (C) and softener (D), wherein the ratio ((C)/(B)) by weight of the syndiotactic polypropylene (C) to the isotactic polypropylene (B) is greater than 0 and less than 1, and the thermoplastic elastomer has a melt flow rate of 0.01 to 1000 g/10 min., wherein the melt flow rate is measured at 230° C. under a load of 10 kg according to ASTM D1238.