Patent ID: 6521560
Filing Date: 2003-02-18
Classification: C08F

Abstract:
A solid titanium catalyst component comprising magnesium, titanium, halogen and an electron donor and having the following properties(1) the titanium content is not more than 2.5% by weight, (2) the total content of magnesium and halogen is at least 65% by weight and less than 92% by weight, (3) the electron donor content is in the range of 8 to 30% by weight, (4) the weight ratio of the electron donor to titanium is in the range of,6to 40, and (5) said solid titanium catalyst component has a titanium content decrease ratio of less than 15% by weight when washed at 90Â° C for 1 hour with 100 milliliters of o-dichlorobenzene, per 0.5 gram of solid titanium catalyst component, and said solid titanium catalyst component is substantially free of elimination of titanium when washed at 25Â° C. for 5 minutes with 500 milliliters of hexane, per 1 gram of the solid titanium catalyst component.