Multimodal polyethylene

摘要

A multimodal polyethylene copolymer suitable for use in cable insulation comprising:
(III) 45 to 55 wt% of a lower molecular weight component which is an ethylene copolymer of ethylene and at least one C3-12 alpha olefin comonomer, said LMW component having a density of 940 to 962 kg/m 3 and an MFR 2 of 50 to 500 g/10min;
(IV) 55 to 45 wt% of a higher molecular weight ethylene copolymer component of ethylene and at least one C3-12 alpha olefin comonomer;
wherein said multimodal polyethylene copolymer has a density of 940 to 950 kg/m 3 , an MFR 2 of 0.05 to 2.0 g/10min and preferably at least one of crystallization half time > 3.0 mins at 120.5°C, a crystallization half time > 5.0 mins at 121°C or a crystallization half time > 10.0 mins at 122°C.