Patent ID: 6610786
Filing Date: 2003-08-26
Classification: C08L

Abstract:
A thermoplastic elastomer comprising (A) a crystalline polyolefin resin and (B) a cross-linked rubber component, which hasa) a gel content expressed as a cyclohexane-insoluble matter after having been soaked in cyclohexane at 23Â° C. for 48 hours of at least 20% by weight, b) a weight change range &Dgr;W after having been soaked in paraffin oil at 50Â° C. for 24 hours amounting to 80% by weight or lower and c) a rate of gummy crust deposition of 30 mg or less within an interval of 10 minutes occuring around the extrusion die upon extrusion of the elastomer into a ribbon on a monoaxial extruder provided with a full-flight extrusion screw having a diameter of 50 mm, an L/D ratio of 28 and a compression ratio of 4.0 through an extrusion die having an extrusion aperture of 25 mmÃ—1 mm under a gradient temperature elevation from the extruder supply inlet to the die outlet of 160-210Â° C. at an extrusion rate of 20 m/min.