Multilayer tubular assembly with foamed coating

Application Number: 00108582
Application Date: 2000.05.18
Publication Number: 1274821
Publication Date: 2000.11.29
Priority Information: 1999/5/19 US 09/314,809
International: F16L9/12;F16L11/12
Applicant(s) Name: TI Group Vehicle System Co.
Inventor(s) Name: H. S. Schehem
Patent Agency Code: 11038
Patent Agent: ren zonghua
Abstract A multi-layer tubing for use in fluid transport applications. The tubing is suitable for conveying fluids containing hydrocarbons. The tubing comprises an extrudable adhesive layer of multi-phase polymer blends or alloys which is coextruded around a permeation-resistant layer of fluoropolymer. An outer layer of foamed polyamide is coextruded around the adhesive layer. The adhesive layer of polymer blends or alloys has a multi-phase morphology wherein one phase is miscible with the fluoropolymer for forming the permeation-resistant layer and another phase is miscible with the polyamide for forming the foamed outer layer.