Patent ID: 6716924
Filing Date: 2004-04-06
Classification: C08F,C08J,C08L

Abstract:
A process for preparing an ethylene polymer composition, comprising:(I) polymerizing ethylene or ethylene and another &agr;-olefin to form an ethylene polymer (i) having an &agr;-olefin content of not more than 30% by weight and an intrinsic viscosity [&eegr;] of at least 1.5 times the intrinsic viscosity of the following ethylene polymer (ii) and ranging from 1 to 12 dl/g, and (II) polymerizing ethylene or ethylene and another &agr;-olefin to form an ethylene polymer (ii) having an &agr;-olefin content of not more than 15% by weight and an intrinsic viscosity [&eegr;] of 0.3 to 3 dl/g, said steps (I) and (II) using an ethylene polymerization catalyst containing a solid titanium catalyst component obtained by contacting (a) a liquid magnesium compound with (b) a liquid titanium compound in the presence of (c) an organosilicon compound or an organosilicon aluminum compound, wherein the step (II) is carried out in the presence of the ethylene polymer (i) obtained in the step (I) or the step (I) is carried out in the presence of the ethylene polymer (ii) obtained in the step (II), to form an ethylene polymer composition having an intrinsic viscosity [&eegr;] of 1 to 6 dl/g and a density of not less than 0.94 g/cm3.