Screw cap composition comprising a multimodal polyethylene

摘要

A screw cap is disclosed comprising a composition based on a multimodal ethylene polymer having a standard density (SD) greater than 950 kg/m<3> and a melt flow index MI2 of less than 2 g/10min, said multimodal ethylene polymer comprising-from 35 to 65wt%, based on the total weight of the multimodal ethylene polymer, of a fraction of ethylene polymer (A) having an SD(A) of more than 965 kg/m<3> and a melt flow index MI2(A) of at least 10 g/10min but less than 400 g/10min, and from 65 to 35wt%, based on the total weight of the multimodal ethylene polymer, of a fraction of a copolymer (B) of ethylene and at least one alpha-olefin containing from 3 to 12 carbon atoms, and having a melt flow index MI2(B) of less than 10 g/10min and a content of said alpha-olefin(s) of from 0.1 to 5 mol%.