Patent ID: 7022797
Filing Date: 2006-04-04
Classification: C08F

Abstract:
1. A method to produce a stereo regular propylene polymer, the method comprising: operating a polymerization reactor under temperature and pressure conditions effective for the reaction of propylene supplied to said reactor to produce a stereo regular propylene polymer fluff; supplying a monomer stream containing propylene to said reactor; incorporating into said monomer stream a titanium-based supported Ziegler-Natta Catalyst having an internal electron donor and a titanium content in amount of from 1.7 wt. % to 2.2 wt. %; supplying to said propylene monomer stream a co-catalyst comprising a trialkylaluminum wherein the co-catalyst is present in an amount to provide an aluminum/titanium molar ratio within the range of 50–500; supplying to said propylene monomer stream a silicone-based external electron donor in an amount to provide an aluminum/silicon molar ratio within the range of 10–500; and recovering polymer fluff from said polymerization reactor having a melt flow rate of at least 200 grams/10 minutes and a xylene soluble content of no more than 4 wt. %.