Patent ID: 7256239
Filing Date: 2007-08-14
Classification: C08F,C08J,Y10T

Abstract:
1. A film of a bimodal polyethylene produced by polymerization catalysed by a single site catalyst having more than one η 5 -cyclic ligand said bimodal polyethylene comprising ai) a lower molecular weight homopolymer of ethylene and bi) a higher molecular weight terpolymer of ethylene, 1-butene and a C or aii) a lower molecular weight polymer which is a binary copolymer of ethylene and a comonomer selected from C bii) a higher molecular weight polymer which is either a binary copolymer of ethylene and 1-butene, if the lower molecular weight polymer of aii) is a binary copolymer of ethylene and a C wherein all components are made by the same catalyst.