Patent ID: 7772338
Filing Date: 2010-08-10
Classification: C08F

Abstract:
1. A process for the production of propylene polymers having a melt flow index ranging from 45 to 150 dg/min as measured by ASTM D 1238 condition L directly in a polymerization reactor without the subsequent use of melt flow increasing agents, said process comprising the step of polymerizing propylene and one or more comonomers in presence of a Ziegler-Natta catalyst comprising a titanium compound having at least one titanium-halogen bond, and a diether compound as internal electron donor, both supported on a magnesium halide in active form, an organoaluminium compound in such an amount that the aluminium concentration, by weight relative to the added monomer, in the polymerization medium ranges from 1 to 75 ppm, an external electron donor, and hydrogen, wherein the molar ratio of organoaluminium compound to external electron donor ranges from 1 to 20.