Patent ID: 6057413
Filing Date: 2000-05-02
Classification: C08F,C08J

Abstract:
A film having a haze of not more than 1.5%, a heat-sealing temperature of not more than 130.degree. C. and a Young's modulus of not less than 2500 kg/cm.sup.2, obtained by melt-extruding a propylene-ethylene random copolymer, having a melt flow rate measured by the method of condition-14 according to JIS K7210 of 3 to 20 g/10 min, prepared by copolymerizing propylene with ethylene in the substantial absence of a solvent, with a catalyst system comprising:(A) a solid catalyst component containing magnesium, titanium, halogen, and a first electron donor as essential components,(B) an organoaluminum compound, and(C) a second electron donor compound, wherein an ethylene content, E, of said copolymer is from 4.3 to 7.0% by weight, and a content of a xylene-soluble portion at 20.degree. C. of said copolymer, D, satisfies the relationship D.ltoreq.E+2.0, and wherein the molar ratio of Al atom in the organoaluminum compound to Ti atom in the solid catalyst component is 1 to 1000, and the molar ratio of the second electron donor compound to Al atom in the organoaluminum compound is 0.15 to 1.0.