Polyethylene and catalyst composition for its preparation

A film comprising a mixture of ethylene homopolymers and copolymers of ethylene with 1-alkenes, the mixture having an HLMI of 7 to 60 g/10 min, a molar mass distribution width Mw/Mn of from 7 to 15, a density of from 0.93 to 0.95 g/cm3, a weight average molar mass Mw of from 50,000 g/mol to 500,000 g/mol and has from 2 to 6 branches of side chains larger than CH3/1000 carbon atoms, a z-average molecular weight Mz of less than 1 million g/mol, wherein 5-50% by weight of the polyethylene having the lowest molar masses has a degree of branching of less than 12 branches/1000 carbon atoms and 5-50% by weight of the polyethylene having the highest molar masses has a degree of branching of more than 1 branch/1000 carbon atoms.

Carrier bags comprising a film, the film comprising a mixture of ethylene homopolymers and copolymers of ethylene with 1-alkenes, the mixture having an HLMI of 7 to 60 g/10 min, a molar mass distribution width Mw/Mn of from 7 to 15, a density of from 0.93 to 0.95 g/cm3, a weight average molar mass Mw of from 50,000 g/mol to 500,000 g/mol and has from 2 to 6 branches of side chains larger than CH3/1000 carbon atoms, a z-average molecular weight Mz of less than 1 million g/mol, wherein 5-50% by weight of the polyethylene having the lowest molar masses has a degree of branching of less than 12 branches/1000 carbon atoms and 5-50% by weight of the polyethylene having the highest molar masses has a degree of branching of more than 1 branch/1000 carbon atoms.

A polyethylene which comprises a mixture of ethylene homopolymers and copolymers of ethylene with 1-alkenes, the polyethylene having an Him of 7 to 60 g/10 min, a molar mass distribution width Mw/Mn of from 7 to 15, a density of from 0.93 to 0.95 g/cm3, a weight average molar mass Mw of from 50,000 g/mol to 500,000 g/mol and has 2 to 6 branches of side chains larger than CH3/1000 carbon atoms, a z-average molecular weight Mz of less than 1 million g/mol, wherein 5-50% by weight of the polyethylene having the lowest molar masses has a degree of branching of less than 12 branches/1000 carbon atoms and 5-50% by weight of the polyethylene having the highest molar masses has a degree of branching of more than 1 branch/1000 carbon atom

• wherein the polyethylene is produced by a process comprising polymerizing ethylene in the presence of 1-alkenes with 3 to 12 carbon atoms in the presence of a catalyst composition comprising at least two different polymerization catalysts, wherein A) is at least one polymerization catalyst based on a hafnocene (A), and B) is at least one polymerization catalyst based on an iron component having a tridentate ligand bearing at least two aryl radicals with each bearing a halogen or tert alkyl substituent in the ortho-position (B).