To provide an optical film improved in curling and blocking properties in a broad and lengthy roll, and high in stability to haze and retardation in drawing, and a polarizing plate with excellent front contrast using the same.
The optical film contains at least a cellulose ester, and an acrylic copolymer or a sugar ester compound including at least one furanose structure or pyranose structure, all or a part of OH groups of the compound to which 1-12 furanose structures or pyranose structures are bonded being esterified. The elastic modulus of the optical film is 3.4 GPA (measured in a 23C, 55 RH% environment) in both a carrying direction (MD direction) and a direction orthogonal to the carrying direction (TD direction) with TD elastic modulus/MD elastic modulus=1.05-2.0.
SUZUKI SHINICHIRO
HASEGAWA MITSUYO
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