Multilayer polyester film with a low coefficient of friction

Details Multilayer polyester film with a low coefficient of friction Multilayer polyester film with a low coefficient of friction

B - Operations, Transporting

32

B

B32B 27/36 (2006.01) C08J 5/18 (2006.01) G11B 5/73 (2006.01) G11B 5/738 (2006.01)

Patent

CA 2247321

A multilayer polyester film, and a method for making the same, is provided. The film consists of alternating layers of polyethylene terephthalate and polyethylene naphthalate. Biaxial orientation and subsequent restrained heat setting of these materials result in thin films with tensile moduli in both stretch directions well in excess of the values obtained with monolithic films of either material. In some embodiments, a slippery surface is imparted to the film without the use of conventional slip agents.

La présente invention concerne un film polyester multicouche et le procédé de fabrication correspondant. Le film est constitué d'une alternance de couches de polyéthylène téréphthalate (PET) et de polyéthylène naphthalate (PFN). L'orientation selon deux axes et le durcissage thermique limité ultérieur de ces matériaux aboutit à la formation de films fins dont le module d'élasticité en traction selon les deux axes est bien supérieur aux valeurs obtenues avec les films monolithiques en l'un ou l'autre des matériaux. Selon certaines réalisations, le film présente une surface glissante sans adjonction de lubrifiant.

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