OPTICAL FILM, METHOD FOR PRODUCING SAME, POLARIZER AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

An optical film comprising a cellulose acylate resin having a total degree of acyl substitution of less than 2.5 and a cellulose acylate resin having a total degree of acyl substitution of 2.5 or more, and satisfying the following formula (1): |A−B|×(b/a)≦̸0.13  (1) wherein A means the total degree of acyl substitution in the cellulose acylate resin having the largest mass abundance ratio; B means the total degree of acyl substitution in the cellulose acylate resin having the second largest mass abundance ratio; a means the mass abundance ratio of the cellulose acylate resin having the largest mass abundance ratio to all the cellulose acylate resins; and b means the mass abundance ratio of the cellulose acylate resin having the second largest mass abundance ratio to all the cellulose acylate resins.