Patent ID: 7427649
Filing Date: 2008-09-23
Classification: B29C,B29K,C08F,C08L

Abstract:
1. A polyethylene composition with trimodal molecular mass distribution, which comprises: a density in the range from 0.955 to 0.960 g/cm an MFI from 45 to 55% by weight of a low-molecular-mass ethylene homopolymer A having a viscosity VN from 20 to 35% by weight of a high-molecular-mass copolymer B made from ethylene and a 1-olefin comonomer having from 4 to 8 carbon atoms, wherein a mixture of homopolymer A and copolymer B has a viscosity number VN from 20 to 30% by weight of an ultrahigh-molecular-mass ethylene copolymer C containing a 1-olefin comonomer having from 4 to 8 carbon atoms, wherein a mixture of homopolymer A, copolymer B, and copolymer C has a viscosity number VN