Patent ID: 8753472

Claim:
A method comprising laying up a pre-formed film or sheet into the inner surface of a preformed metal or plastic pipe to produce a film- or sheet-lined pipe wherein the film or sheet is a monolayer or multilayer film or sheet and comprises or is produced from a grafted polyolefin composition; the film or sheet has a thickness of about 0.001 to about 102 mm; and the grafted polyolefin in the grafted polyolefin composition is produced by grafting a parent polyolefin with an α,β-ethylenically unsaturated carboxylic acid or anhydride; the parent polyolefin comprises repeat units derived from ethylene and a C 3-20 α-olefin, has a density of about 0.88 g/cc (ASTM D-792) or less, and has a Shore A hardness of about 96 or less (ASTM D2240, ISO 868).