CATALYST COMPOSITION WITH MONOCARBOXYLIC ACID ESTER INTERNAL DONOR AND PROPYLENE POLYMERIZATION PROCESS

摘要

The present invention is a transition metal compound and at least one mono- ester internal electron donor one kind of an aromatic carboxylic acid at least one comprising at least a Ziegler -Natta procatalyst composition; One or more aluminum containing cocatalysts ; And two or more different species, comprising a mixture of selectivity control agent (SCA), the SCA is a mixture of one or more of one or more esters of aromatic mono -carboxylic acid or a substituted derivative of 70 to 98 mol% , and at least one 14 , 15 or group 16 heteroatom optionally containing one or more 5-or 6-membered ring at least one alkoxysilane compound containing a group containing from 30 to 2 mol % , to a catalyst composition for the polymerization of propylene .