Patent ID: 6403710
Filing Date: 2002-06-11
Classification: C08L,C09D,C09J

Abstract:
A thermoplastic elatomeric composition comprising from about 70 to about 90 percent by weight, based on the total weight of the composition, of a saturated styrene triblock copolymer containing about 10 to 35 weight percent styrene and from about 10 to 30 percent by weight, based on the total weight of the composition, of a homogeneously branched linear ethylene interpolymer characterized as an interpolymer of ethylene with at least one C3-C20 &agr;-olefin and as having a density from about 0.855 to about 0.905 g/cc ad a short chain branching distribution index (SCBDI) of greater than 50 percent, wherein the homogeneously branched linear ethylene interpolymer in the amount employed is a substantially inert extender of the triblock copolymer and wherein the composition is further characterized as having:i. storage moduli throughout the range of âˆ’26Â° C. to 24Â° C. of less than about 3.5Ã—109 dynes/cm2, ii. a ratio of storage modulus at âˆ’26Â° C. to storage modulus at 24Â° C. of less than about 3, and iii. storage moduli at âˆ’26Â° C. and 24Â° C. about 0.4 to about 2.2 times higher than the storage moduli at âˆ’26Â° C. and 24Â° C., respectively, of the neat syrene block copolymer portion of the composition.