Coated pipe and process for making same

Details Coated pipe and process for making same Coated pipe and process for making same

1978-11-06

1980-07-22

Dixon, Jr., William R.

Pipes and tubular conduits

Distinct layers

Bonded to each other

138144, 138145, 156150, 156187, 427 29, 427195, 428 36, F16L 914, B65H 8100

Patent

active

042134862

ABSTRACT:
Steel pipe is provided with an external protective coating by first applying a corrosion protective coating of fused powdered epoxy resin adhered to the pipe, then applying (e.g. as by wrapping a sheet) an outer polyolefin layer directly onto the corrosion protective coating. The outer sheet of polyolefin is provided with a pressure-sensitive adhesive or a hot melt adhesive which adhesive may also be reactive with the epoxy coating (e.g. one having free carboxyl group such as ethylene acrylic acid copolymer). The polyolefin is preferably polyethylene or polypropylene and most preferably polyethylene. Either high or low density polyolefin may be used.

REFERENCES:
patent: 3390704 (1968-07-01), Woodell
patent: 3508946 (1970-04-01), Plueddemann et al.
patent: 3578615 (1971-05-01), Moore et al.
patent: 3687765 (1972-08-01), MacLean et al.
patent: 3874418 (1975-04-01), Hielema
patent: 3904346 (1975-09-01), Shaw et al.
patent: 4011354 (1977-03-01), Drostholm et al.
patent: 4060655 (1977-11-01), Johannes et al.
patent: 4062710 (1977-12-01), Muckenheim

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