Patent ID: 7132486
Filing Date: 2006-11-07
Classification: C08F

Abstract:
1. A gas phase polymerization process for producind a substantially unblended polyethylene comprising combining ethylene and α-olefin in the presence of a polymerization catalyst under polymerization conditions, wherein the ethylene α-olefin copolymer so formed comprises: a density in the range of from 0.910–0.960 gm/cm3; wherein said copolymer has a melt index ratio I a melt strength (MS) in the range of from 7–20 cN; less than 10 weight percent of a separate, branched polymer; and a CDBI of greater than 60%; and a Mw/Mn of ≦4.5; wherein said polymerization catalyst includes catalysis by a mixed metallocene system comprising: wherein a) and b) are each separately supported on silica support; wherein said a) and b) are present in said gas phase polymerization process in a ratio of 90:10–10:90, or 80:20–20:80, or 75:25–25:75, or 60:40–40:60, or 50:50; and wherein said mixed metallocene system is activated by one of a methylalumoxane, modified methylalumoxane, or non-coordinating anious, or mixtures thereof.