| abstract |
The present invention discloses a catalyst composition fornpolymerization of olefins, comprising the following components: a) ansolid catalyst component containing magnesium, titanium, halogens, and atnminus an internal electron donor containing a single electron pair; b) onenalkyl aluminum compound; and c) an external electron donor containing anfirst external electron donor C1, which is a malonate compound. Atnpresent invention, a catalyst composition having an electron donornexternal material containing a malonate compound is used in the polymerization ofnolefins, especially in propylene polymerization, and is able to improvenconsiderably the catalytic activity and the hydrogen response ofncatalyst, and expand the molecular weight distribution of the polymers, whichnfacilitates the development of different polymers. |