| 摘要 |
<p>An olefin-based thermoplastic elastomer composition for powder molding, which comprises 5 to 93% by weight of (a) and 7 to 95% by weight of (b) described below, and is prepared from an olefin-based thermoplastic elastomer composition having a complex dynamic viscosity eta *(1) at 250 DEG C of 1.5 x10<5> poise or less as measured at a vibration frequency of 1 radian/sec. and a Newtonian viscosity index n of 0.67 or less as calculated by the equation ÄIÜ described below; (a): a polyolefin-based resin, (b): at least one of (b1) and (b2) described below; (b1): a propylene-1-butene-based copolymer rubber having a Shore A hardness of 70 or less as measured in accordance with ASTM D2240 and an intrinsic viscosity Ä eta Ü of 0.3dl/g or more as measured at a temperature of 70 DEG C in xylene, (b2): a propylene- alpha -olefin-ethylene-based copolymer rubber having a Shore A hardness of 70 or less as measured in accordance with ASTM D2240 and an intrinsic viscosity Ä eta Ü of 0.3dl/g or more as measured at a temperature of 70 DEG C in xylene and comprising propylene, an alpha -olefin having 4 to 20 carbon atoms and ethylene. <MATH> (in the above-mentioned equation, eta *(1) represents a complex dynamic viscosity at 250 DEG C measured at a vibration frequency of 1 radian/sec., and eta *(100) represents a complex dynamic viscosity at 250 DEG C measured at a vibration frequency of 100 radian/sec.) According to the present invention, an olefin-based thermoplastic elastomer composition for powder molding, which makes the best use of the merit of an olefin-based material such as no emission of poisonous gas at incineration, is hardly whitened on bending and is excellent in flexibility; powder for powder molding prepared from the composition; and a molded article obtained by powder molding the powder; are provided.</p> |
