The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 2000
Filed:
May. 19, 1999
Henry S Hsich, Rochester Hills, MI (US);
Dean T Su, Princeton Junction, NJ (US);
Hybritech Polymers, Mercerville, NJ (US);
Abstract
A multi-layer tubing for use in fluid transport applications. The tubing is suitable for conveying fluids containing hydrocarbons. The tubing comprising an extrudable adhesive layer coextruded around a permeation-resistant layer of fluoropolymer and a layer of polymer chemically dissimilar from fluoropolymer coextruded around the adhesive . The adhesive layer is formed of a polymer blend or alloy having a multi-phase morphology wherein one phase is miscible with the fluoropolymer for forming the inner permeation-resistant layer and another phase is miscible with the polymer chemically dissimilar from fluoropolymer. To achieve sufficient bonding, the adhesive layer comprises at least 25% volume fraction of the first phase which is miscible with the fluoropolymer for forming inner permeation-resistant layer and at least 25% volume fraction of the second phase which is miscible with the polymer chemically dissimilar from fluoropolymer. Furthermore, the adhesive layer of polymer blends or alloys having a multi-phase morphology can be modified by adding compatibilizers and rheology modifiers to improve adhesion strength and to allow the material for forming the adhesive layer to obtain proper viscosity and elasticity for extrusion.