Abstract: A cellulose ester film containing a polyester represented by Formula (1) or (2), wherein an in-plane retardation value (Ro) is 0 to 5 nm and a retardation value in a thickness direction (Rt) is ?20 to 10 nm, Ro and Rt being measured at 23° C. and 55% RH: B1-(G-A-)mG-B1??Formula (1) wherein B1: monocarboxylic acid, G: dihydric alcohol, A: dibasic acid, B1, G and A contain no aromatic ring, m: repeat number, plural B1 may be the same or different, and plural G may be the same or different; and B2-(A-G-)nA-B2??Formula (2) wherein B2: monoalcohol, G: dihydric alcohol, A: dibasic acid, provided that none of B2, G and A contains an aromatic ring, n: repeat number, plural B2 may be the same or different, and plural G may be the same or different.

Abstract: A polarizing plate includes two transparent supports A and B; and a polarizer sandwiched between the two transparent supports A and B; wherein (i) the transparent support A is a stretched cellulose ester film (a) which contains a non-phosphoric acid ester plasticizer and substantially does not contain a phosphoric acid ester plasticizer, and wherein (ii) the transparent support B is a stretched cellulose ester film (b) which has a retardation value R0 of from 0 nm to 10 nm and a retardation value Rt of from ?30 nm to 20 nm, and the retardation value R0 and the retardation value Rt are defined by the following formulas (I) and (II): Ro=(nx?ny)×d??Formula (I): Rt={(nx+ny)/2?nz}×d.

Abstract: An object of the present invention is to provide a polarizing plate protective film exhibiting a reduced variation value retardation, which is highly stable against polarizing plate degradation, polarizing plate dimension, and polarizing plate curl. Disclosed is a cellulose ester film possessing cellulose ester, polymer X having a weight average molecular weight of 2000-30000 prepared by copolymerizing ethylenic unsaturated monomer Xa containing no aromatic ring and hydrophilic group within a molecule and ethylenic unsaturated monomer Xb containing no aromatic ring but a hydrophilic group within a molecule, and polymer Y having a weight average molecular weight of 500-3000 prepared by polymerizing ethylenic unsaturated monomer Ya containing no aromatic ring.