Patent ID: 7407686
Filing Date: 2008-08-05
Classification: B29C,B29D,B29K,C09K,Y10T

Abstract:
1. A process for producing an optical film comprising the steps of: (a) casting a dope comprising a cellulose ester and a non-chlorinated solvent on a metal support, the cellulose ester having a total acyl substitution degree of 2.6 to 2.85 and having a ratio of a weight-average molecular weight to a number-average molecular weight of 1:1 to 3:1; (b) drying the cast dope on the metal support so as to obtain a cellulose ester film; (c) peeling the cellulose ester film from the metal support; (d) further drying the cellulose ester film while providing a longitudinal stretch or a lateral stretch to the cellulose ester film; and (e) providing a metal oxide layer on the cellulose ester film using a plasma CVD method, wherein the plasma CVD method is carried out under atmospheric pressure.