| 摘要 |
<p>PURPOSE: A highly oriented fluoropolymer film is provided to improve the properties of mechanical strength, toughness, and water vapor barrier capability without increasing the film gauge and produce a multilayered film structure which is dimensionally stable and uniform across its entire width. CONSTITUTION: The highly oriented multilayer films comprising coextruding films having at least one layer of a fluoropolymer, at least one layer of a polyolefin homopolymer or copolymer and an intermediate adhesive layer of a polyolefin having at least one functional moiety of an unsaturated carboxyl acid or anhydride thereof. With this structure the polyolefin layer allows the fluoropolymer layer to be stretched up to ten times its original length. Coextrusion processing is done at higher temperatures, i.e. in the range of from at about 280°C to about 400°C. These temperatures allow films to be produced in the absence of polymer degradation and film melt fracture.</p> |
