Patent ID: 6545093
Filing Date: 2003-04-08
Classification: C08L

Abstract:
A bimodal polyethylene blend with a melt flow rate MFR 190/21.6 of from 6 to 14 g/10 min, a density of from 0.94 to 0.97 g/cm3 and an environmental-stress-cracking resistance ESCR>150 h, comprisingfrom 40 to 80% by weight of a high-molecular-weight ethylene copolymer with a weight-average molar mass&gE;300,000 g/mol and a polydispersity Mw/Mn of from 1-12, and from 20 to 60% by weight of a low-molecular-weight ethylene homo- or copolymer with a weight-average molar mass of from 8000 to 80,000 g/mol and a polydispersity Mw/Mn of from 2.5 to 12, where measurement to ISO 13949 of the quality of blending in the blend gives a value of less than 3.