Patent ID: 7048882
Filing Date: 2006-05-23
Classification: B29C,C08F,C08L,Y10T

Abstract:
1. A process for coating a substrate, comprising producing a bimodal polyethylene composition by subjecting ethylene, optionally with hydrogen and/or comonomers to polymerization or copolymerization reactions in a multistage polymerization sequence of successive polymerization stages; carrying out the polymerization reactions in the presence of a single site catalyst capable of forming a composition comprising a low molecular weight component with an MFR a high molecular weight component, said composition having a melt flow rate MFR extruding said composition on the substrate as such or by adding 10 wt % or less, calculated from the total weight of the coating, of high pressure PE-LD by blending into the extrusion composition or by co-extrusion wherein the active complex of said single site catalyst has the general formula where X Hf is hafnium; Cp is cyclopentadienyl group; and R