Patent ID: 8202937

Claim:
A method for producing an optical film having a thickness of 20-250 μm comprising an acrylic resin (A) and a cellulose ester resin (B), having a weight ratio of (A) to (B) is between 95:5 and 30:70, the method at least comprising: casting a mixture comprising the acrylic resin (A) and the cellulose ester resin (B) onto a metal support from a pressurized die slit to make a web; peeling the web from the metal support; drying and stretching the peeled web; and wherein both of an acrylic resin (A) and a cellulose ester resin (B) are incorporated in a compatible state, and a weight average molecular weight Mw of the acrylic resin (A) is 80,000 or more.