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:
Aug. 31, 1999
Filed:
Dec. 10, 1996
Mingliang Lawrence Tsai, Holmdel, NJ (US);
Yash Paul Khanna, Morristown, NJ (US);
Joseph Edgar Mackey, East Hanover, NJ (US);
Russell Lee Schneider, Sun Prairie, WI (US);
Alfieri Degrassi, Pottsville, PA (US);
AlliedSignal Inc., Morris Township, NJ (US);
Abstract
The present invention provides biaxially oriented multilayer fluoropolymer films. They are produced by coextruding or laminating films having at least one layer of a fluoropolymer, at least one layer of a thermoplastic homopolymer or copolymer and an intermediate adhesive layer which is preferably a polyolefin having at least one functional moiety of an unsaturated carboxylic acid or anhydride thereof. With this structure the thermoplastic layer allows the fluoropolymer layer to be biaxially stretched many times its original length. A high orientation ratio for the fluoropolymer film increases the mechanical strength, toughness, and water vapor barrier properties of the film while using a thinner gauge fluoropolymer film. Coextrusion processing can be done at higher temperatures, i.e. in the range of from at about 280.degree. C. to about 400.degree. C. These temperatures allow films to be produced in the absence of polymer degradation and film melt fracture.