Process for producing a polyethylene coating on a substrate

Details Process for producing a polyethylene coating on a substrate Process for producing a polyethylene coating on a substrate

2006-05-23

2006-05-23

Kruer, Kevin R. (Department: 1773)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C525S191000, C525S240000, C526S065000, C428S511000, C428S523000

Reexamination Certificate

active

07048882

ABSTRACT:
This invention concerns a process for coating a substrate, and an extrusion coating structure. According to the present process, the coating is provided by 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. The polymerization reactions are carried out in the presence of a single site catalyst capable of forming a composition which comprises a low molecular weight component with an MFR2of 20 g/10 min or more and a density higher than the density of the composition, and a high molecular weight component, said composition having a melt flow rate MFR2of 5 g/10 min or more and a density of 915–960 kg/m3. The composition is extruded 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 coextrusion.

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