Patent ID: 6921799
Filing Date: 2005-07-26
Classification: C08F,Y10S

Abstract:
1. A process for olefin polymerization, which process comprises at least two polymerization stages, a relatively earlier of said stages comprising polymerizing ethylene and optionally a C 4-10 α-olefin in the presence of hydrogen and a Zr, Hf or Ti metal containing metallocene olefin polymerization catalyst whereby to produce a first polymerization product, and a relatively later of said stages comprising polymerizing ethylene and optionally a C 4-10 α-olefin in the presence of metallocene olefin polymerization catalyst whereby to yield a polymerization product wherein at least 60% by weight of the product is derived from ethylene and said product has a lower MFR 2 than said first polymerization product wherein hydrogen is substantially entirely consumed in the relatively earlier of said stages.