Patent ID: 6323150
Filing Date: 2001-11-27
Classification: C08F

Abstract:
A process for preparing a solid titanium catalyst component, comprising the steps of:(I) contacting a liquid magnesium compound with a liquid titanium compound to precipitate a solid in the contact liquid (.beta.), and adding an electron donor (d-i), which is selected from the group consisting of a polycarboxylic ester and a compound having two or more ether linkages present through plural atoms, to the contact liquid (.beta.) during the time between the beginning and the end of the solid precipitation, to form a solid product (.alpha.) comprising titanium, magnesium and the electron donor (d-i); and then(II) contacting the solid product (.alpha.) obtained after completion of the solid precipitation with an electron donor (d-ii) selected from the group consisting of a polycarboxylic ester and a compound having two or more ether linkages present through plural atoms, to prepare a solid titanium catalyst component comprising titanium, magnesium, the electron donor (d-i) and the electron donor (d-ii).