Patent ID: 7893003
Filing Date: 2011-02-22
Classification: B01J,C08F

Abstract:
1. A catalyst composition comprising: a Ziegler-Natta procatalyst composition comprising titanium, magnesium and an internal electron donor; a cocatalyst; and a mixed external electron donor (M-EED) comprising an activity limiting agent (ALA), a first selectivity control agent (SCA1) comprising an alkoxysilane, a second selectivity control agent (SCA2) selected from the group consisting of an alkoxysilane, a diether, and a dialkoxybenzene, a SCA1:SCA2 mole ratio from 0.1-1.0:1, a mole ratio of total-SCA to ALA less than 1.0, and the catalyst composition is a self-limiting catalyst composition.