Patent Number: 6,255,247

Title: Optimum external co-catalyst electron donor molar ratio in propylene polymerization

Abstract: This invention is for a process for the polymerization of propylene to a minimum level of xylene solubles by use of the molar ratio of co-catalyst to external electron donor (selectivity control agent). Using a conventional supported heterogeneous Ziegler-Natta catalyst component with an trialkyl aluminum co-catalyst and an cycloalkylalkyldialkoxysilane external electron nor (selectivity control agent) in a Al/Si molar ratio of about results in the minimum amount of xylene solubles.

Inventors: Shamshoum; Edwar Shoukri (Houston, TX), Rauscher; David John (Webster, TX)

Assignee: Fina Technology, Inc.

International Classification: C08F 110/06 (20060101); C08F 110/00 (20060101); C08F 4/00 (20060101); C08F 4/606 (20060101); B01J 031/00 ()

Expiration Date: 07/03/2018