Multilayer polyester film

Details Multilayer polyester film Multilayer polyester film

B - Operations, Transporting

32

B

B32B 27/36 (2006.01) B29C 55/02 (2006.01) G02B 5/28 (2006.01)

Patent

CA 2247264

A multilayer polyester film, and a method for making the same, is provided. The film consists of alternating layers of polyethylene terephthalate (14) and polyethylene naphthalate (12). Biaxial orientation and subsequent restrained heat setting of these materials results 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.

L'invention concerne un film polyester multicouche et son procédé de fabrication. Le film se compose de couches alternées de polyétylène téréphtalate (14) et de polyéthylène naphthalate (12). L'orientation biaxiale et le thermofixage modéré ultérieur de ces matériaux donnent lieu à des films minces dont les modules d'élasticité dans les deux sens d'étirement sont supérieurs aux valeurs obtenues avec les films monolithes de l'un ou l'autre des matériaux. Dans certains modes de réalisation, on confère au film une surface glissante sans utiliser d'agents glissants conventionnels.

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