초록

Reinforced composite pipes and methods for making the same, generally employ at least one polymeric reinforcement phase, typically provided as an intermediate form 214. The intermediate form is typically applied over a core pipe 216, and may be consolidated. An optional jacket may be employed.

대표청구항 ▼

The invention claimed is: 1. A method for making a composite pipe, comprising the steps of:providing a core pipe,covering the core pipe with an intermediate form,heating the intermediate form, andoptionally applying a jacket over at least a portion of the intermediate form and the core pipe for prot

The invention claimed is: 1. A method for making a composite pipe, comprising the steps of:providing a core pipe,covering the core pipe with an intermediate form,heating the intermediate form, andoptionally applying a jacket over at least a portion of the intermediate form and the core pipe for protecting the core pipe with the intermediate form,characterized in that:the intermediate form includes at least one winding of at least one coextruded thermoplastic elongated member, wherein the elongated member comprises a first polyolefin material coextruded with a second polyolefin material that is different from the first polyolefin material and the second polyolefin material includes an isotactic polypropylene homopolymer with a peak melting temperature greater than 160° C; andthe heating step includes heating the elongated member to one or more temperatures above the melting point of the first polyolefin material but below the peak melting temperature of the second polyolefin material for consolidating the intermediate form and for at least partially melting the at least one elongated member of the intermediate form for fusing the elongated member to the core pipe.