Polyethylene composition and finished products made thereof

摘要

Novel polyethylenes having defined molecular weight distribution and LCB structure are devised, for films or moldings.

主权项

1. A polyethylene composition having a melt flow rate at 5 kg/190° C. (MI5kg) according to ISO 1133:2005 from 0.25 to 3 g/10 min and a Hostalen Processing Index (HI) value from 0.18 to 18, wherein when the MI5kg is >1.9 g/10 min, then the HI value is >1
wherein the HI is defined asHI=(MzMw)⁢(1gMz)⁢(ehat⁢⁢0.1⁢⁢s-1-0.99) where: Mz is the z-average molecular weight Mw is the weight-average molecular weight gMz is the branching factor at a molecular weight M=Mz eh is the elongational hardening of the polymer at a uniaxial elongation rate of 0.1 s−1 and at a test temperature of T=150° C., andeh=ηE,maxηs wherein ηE,max is the maximum melt elongational viscosity measured at the given elongation rate and ηs is the linear viscoelastic response, and wherein the polyethylene composition has a density from 0.950 to 0.97 g/cm3.