Patent ID: 7256239

Claim:
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 6 to C 12 alpha-olefin, or aii) a lower molecular weight polymer which is a binary copolymer of ethylene and a comonomer selected from C 4 to C 12 alpha-olefins and 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 6 to C 12 alpha-olefin, or a terpolymer of ethylene, 1-butene and a comonomer selected from C 6 to C 12 alpha-olefin; wherein all components are made by the same catalyst.