Polyarylate film having optical isotropy and production process thereof.

摘要

A polyarylate film having optical isotropy and processes for the preparation thereof are disclosed, in which the film satisfies the following relationship (1) and (2); W >/= 1000 - 70000 T<2> (1> W >/= 850 - 70000 T<2> (2> wherein in the formulae, T is the film thickness in mm and W is the film width in mm, and the retardation value of the films (1) and (2) is not more than 20 nm and 10 nm over the whole range thereof, respectively.