Patent ID: 8246737

Claim:
A cellulose ester optical film containing cellulose ester, a polymer (a) below in an amount of 4.00 to 50 parts by weight per 100 parts by weight of cellulose ester and a compound (b) below in an amount of 0.6 to 2.6 parts by weight per 100 parts by weight of cellulose ester: (a) a polymer obtained by copolymerization of a first ethylenically unsaturated monomer selected from the group consisting of N-vinyl pyrrolidone, N-acryloyl morpholine or mixtures thereof with at least one second ethylenically unsaturated monomer selected from the group consisting of acrylic acid esters, methacrylic acid esters, alkyl vinyl esters, styrene and styrene derivatives, and a content ratio by weight in the polymer of the first ethylenically unsaturated monomer to the second ethylenically unsaturated monomer is from 10:90 to 80:20, (b) at least one compound selected from the group consisting of a compound represented by formula (2) below and a compound represented by formula (3) below, Q 1 -Q 2 -OH Formula (2) wherein Q 1 represents a substituted or unsubstituted benzotriazole ring, or triazine ring, and Q 2 represents a substituted or unsubstituted a benzene ring or naphthalene ring, wherein Q 11 and Q 12 independently represent a substituted or unsubstituted benzene ring.