Patent ID: 8416369

Claim:
A polarizer protective film comprising: a cellulose acylate having a total acyl substitution degree of from 2.2 to less than 2.5; and a polymer represented by Formula (1), wherein an in-plane retardation value of the film Ro is 0 to 100 nm and a retardation value in a thickness direction of the film Rth is 40 to 250 nm, Ro =( nx−ny )× d Rth ={( nx+ny )/2− nz}×d wherein, nz is a refractive index in a slow axis direction in a film plane, ny is a refractive index in a fast axis direction in the film plane, nz is a refractive index in a thickness direction of the film and d is a thickness of the film (nm), —[CH 2 —C(—R 1 )(—CO 2 R 2 )] m —[CH 2 (—CR 3 )(—CO 2 R 4 —OH)—] n Formula (1) where R 1 and R 3 each represent H or CH 3 , R 2 represents an alkyl group having 2-12 carbon atoms or a cycloalkyl group, R 4 represents —CH 2 —, —C 2 H 4 —, or —C 3 H 6 —, m and n each represent a molar ratio, and m+n=100.