Composite pipes and method making same

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, and
• optionally 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 and includes isotactic polypropylene homopolymer with a peak melting temperature greater than 160° C.;
• and
• the 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,
• wherein the intermediate form includes a plurality of elongated member layers, with at least one of the layers including an elongated member stretched to at least 5x.