Biaxially drawn polyhexamethylene adipamide film and process...

Details Biaxially drawn polyhexamethylene adipamide film and process... Biaxially drawn polyhexamethylene adipamide film and process...

B - Operations, Transporting

29

C

18/1041

B29C 59/00 (2006.01)

Patent

CA 1148713

ABSTRACT OF THE DISCLOSURE Provided is a biaxially drawn film composed substantially of polyhexamethylene adipamide, which has a refractive index of at least 1.560 in both the longitudinal direction and the transverse direction and an ultraviolet absorbance E268 of not more than 0.4, as measured at a wavelength of 268 mµ on a film solution in formic acid. The film preferably exhibits a shrinkage factor of not more than 5% in both the longitudinal direction and the transverse direction, as measured after dipping in hot water at 135°C for 10 minutes. The film is prepared by heat-treating a biaxially drawn polyhexamethylene adipamide film in an inert gas atmosphere at a temperature higher than the drawing temper- ature employed but lower than the melting point of the film.

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