Pipe preformed liner comprising metal powder
View Patent ↗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.
1. A pipe having a preformed tubular liner adhered onto the interior and/or exterior surface of the pipe, wherein the preformed tubular liner comprises a melt-processible copolymer of tetrafluoroethylene and perfluoro (alkyl vinyl ether) and an effective amount of metal powder to adhere the liner to the pipe, said metal powder is selected from the group consisting of zinc, copper and tin or combinations thereof wherein the preformed liner comprises an inner layer and an outer layer and said inner layer comprises a plurality of barrier particles.