OPTICAL FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE
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United States of America Patent
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Issued Date -
Jan 15, 2015
app pub date -
Jul 11, 2014
filing date -
Jul 12, 2013
priority date (Note) -
Abandoned
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Abstract
Disclosed is an optical film having a cellulose ester and a polyester containing an alicyclic structure and having a hydroxyl terminal group, a hydrogen atom of which is substituted by an acyl group derived from a monocarboxylic acid, and having a thickness of from 10 to 45 μm, an in-plane retardation of from −5 to 5 nm, a retardation in thickness direction of from −5 to 5 nm, and an elastic modulus of 4.2 GPa or more. The optical film has a reduced thickness, achieves both a high rigidity and optical characteristics including a low retardation, and enhances the polarizer durability used in a polarizing plate.
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