Patent ID: 6825293
Filing Date: 2004-11-30
Classification: C08F,Y10S

Abstract:
In a process for the gas phase polymerization of ethylene and from 0 to 20 weight % of one or more C4-8 copolymerizable alpha olefin monomers in the presence of a supported Ziegler-Natta catalyst co-catalyzed with a co-catalyst selected from the group consisting of tri C2-6 alkyl aluminum, alkyl aluminum halides and mixtures thereof, the improvement of controlling the feed of said co-catalyst to the reactor to provide from 10 to 50 ppm of aluminum from the co-catalyst based on the polymer production rate provided that the molar ratio of total Al from the catalyst and co-catalyst:Ti from the catalyst is from 25:1 to 80:1.