Patent ID: 6806222
Filing Date: 2004-10-19
Classification: C08F

Abstract:
A solid titanium catalyst component being obtained by a process comprising:a step of bringing (a) a liquid magnesium compound into contact with (b) a liquid titanium compound in the presence of (c) an organosilicon compound having no active hydrogen in an amount of 0.25 to 0.35 mol based on 1 mol of the magnesium compound (a); and a step of elevating the temperature of the resulting contact product (i) to a temperature of 105 to 115Â° C. and maintaining the contact product (i) at this temperature, said solid titanium catalyst component comprising magnesium, titanium, halogen and the organosilicon compound having no active hydrogen (c), having a catalytic activity of 44,800 g-polymer/g-catalyst and a ratio of powdery polymer having a particle size of less than 100 &mgr;m of 1.5% by weight or below when used to polymerize ethylene for 2 hours at a temperature of 80Â° C. and a partial pressure of ethylene of 4.0 kg/cm2-G.