Thermoplastic elastomer composition, powder or pellet of the same, and molded article comprising the same

摘要

A thermoplastic elastomer composition comprising 100 parts by weight of a polyolefin resin, 5 to 250 parts by weight of a rubbery polymer and 0 to 500 parts by weight of an ethylene-alpha-olefin copolymer rubber, wherein a complex dynamic viscosity eta*(1) at 250° C. is 1.5x105 poise or less and a Newtonian viscosity index n is 0.67 or less, and furthermore, wherein said thermoplastic elastomer composition has a specific tan delta peak, the peak temperature of which is different from that of the polyolefin resin and that of the rubbery polymer, at a temperature within the range from -70 to 30° C. in a temperature dependence curve of tan delta determined by solid dynamic viscoelasticity measurement, powder or pellet thereof, and a molded article thereof.