Pipe preformed liner comprising metal powder

Details Pipe preformed liner comprising metal powder Pipe preformed liner comprising metal powder

2006-12-18

2011-10-18

Aughenbaugh, Walter B (Department: 1782)

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

C428S034600, C428S034700, C428S036400, C428S036600, C428S036700, C138S141000

Reexamination Certificate

active

08039073

ABSTRACT:
The present invention relates to a preformed liner of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer adhered to the surface of a pipe, and in particular, an oil well pipe, without the need for either a primer layer or an adhesive. The liner comprises an effective amount of metal powder which provides adhesion between the liner and the surface of the pipe. The present invention also relates to a process for making such pipe, where in a preferred embodiment, the liner is co-extruded to form an inner layer and an outer layer. This co-extrusion embodiment is particularly useful in applications where high purity is necessary. In this case, the inner layer comprises an effective amount of metal powder and the outer layer is pure tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.

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Ebnesajjad, S., “vol. 2: Melt Processible Fluoropolymers The Definitive User's Guide and Databook”, FLUOROPLASTICS, 2003, p. 264, Plastics Design Library, Norwich, NY.

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