Patent ID: 6635705
Filing Date: 2003-10-21
Classification: C08K,C08L,Y10S

Abstract:
A method for an olefinic thermoplastic elastomer composition comprising dynamically heat treating, in the presence of a crosslinking agent under the following conditions, 10 to 60 weight parts of a crystalline polyolefin resin (A) and 90 to 40 weight parts of an ethylene-&agr;-olefin-non-conjugated polyene copolymer rubber (B) consisting of ethylene, an &agr;-olefin having 3 to 20 carbon atoms and a non-conjugated polyene said conditions being according to the following formula,5.5<2.2 logX+logYâˆ’logZ+(Tâˆ’180)Ã·100<6.5 wherein T is a resin temperature (Â° C.) at the die exit of a twin-screw extruder, X is a screw diameter (mm) of the twin-screw extruder, Y is a maximum shear rate (secâˆ’1) generated in the twin-screw extruder and Z is an extrusion amount (kg/h).