Patent ID: 6335095
Filing Date: 2002-01-01
Classification: B32B,C08L,Y10S,Y10T

Abstract:
A thermoplastic elastomer composition powder comprising a thermoplastic elastomer composition having a number average sphere-reduced diameter of not more than 1.2 mm and a bulk specific density of not less than 0.38,wherein the thermoplastic elastomer composition is selected from the group consisting of (1) a mixture, comprising: (a) 100 parts by weight of a crystallizable polyolefin resin; (b) 20 to 250 parts by weight of a hydrogenated conjugated diene polymer or a hydrogenated conjugated diene copolymer having a hydrogenation degree of not less than 70%, which is prepared by hydrogenating a conjugated diene-vinyl aromatic compound random copolymer in which the content of vinyl aromatic compound unit is not more than 25% by weight; and (c) 10 to 350 parts of an ethylene/&agr;-olefin copolymer rubber; and (2) a dynamically crosslinked product of said composition (1), wherein the powder is produced by a solution treatment method, strand-cut method or die-face cut method, the thermoplastic elastomer composition has a complex dynamic viscosity &eegr;*(1) measured at 250Â° C. under a vibration frequency of 1 radian/second of not more than 5Ã—104 poise, and a Newtonian viscosity index n calculated by the following formula: â€ƒn=(log &eegr;*(1)âˆ’log &eegr;*(100)/2using &eegr;*(1) and a complex dynamic viscosity &eegr;*(100) measured at 250Â° C. under vibration frequency of 100 radian/second of not more than 0.28.