Patent ID: 6531545
Filing Date: 2003-03-11
Classification: B29C,C08L

Abstract:
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 has a complex dynamic viscosity &eegr;*(1) at 250Â° C. of 1.5Ã—105 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 [I] described below:(a) a polyolefin-based resin; (b) at least one of (b1) and (b2): (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 [&eegr;] of 0.3 dl/g or more as measured at a temperature of 70Â° C. in xylene, (b2) a propylene-&agr;-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 [&eegr;] of 0.3 dl/g or more as measured at a temperature of 70Â° C. in xylene and comprising propylene, an &agr;-olefin having 4 to 20 carbon atoms, and ethylene; and n={(log &eegr;*(1)âˆ’log &eegr;*(100)}/2; wherein &eegr;*(1)â€ƒâ€ƒequation [I]represents a complex dynamic viscosity at 250Â° C. measured at a vibration frequency of 1 radian/sec., and &eegr;*(100) represents a complex dynamic viscosity at 250Â° C. measured at a vibration frequency of 100 radian/sec.