Patent ID: 9051458
Filing Date: 2015-06-09
Classification: C08F,C08L,Y02P

Abstract:
1. A polyethylene molding composition comprising: (A) 45 to 55% by weight, based on a total weight of the polyethylene molding composition, of a low molecular weight ethylene homopolymer A having a viscosity number VN (B) 20 to 40% by weight, based on a total weight of the polyethylene molding composition, of a high molecular weight copolymer B comprising ethylene and from 1 to 8% by weight of another olefin comprising from 4 to 8 carbon atoms, based on the weight of the high molecular weight copolymer B, wherein the mixture of homopolymer A and copolymer B has a viscosity number VN (C) 15 to 30% by weight, based on a total weight of the polyethylene molding composition, of an ultrahigh molecular weight ethylene copolymer C, wherein the polyethylene molding composition: (i) has an environmental stress cracking resistance (ESCR) greater than 2500 hours (ii) has a viscosity number VN (iii) has a density between 0.945 and 0.955 g/cm (iv) has a melt flow index, MFI (v) has a trimodal molecular weight distribution, and (vi) has a notched impact toughness from 8 to 14 kJ/m