OPTICAL FILM, METHOD FOR PRODUCING OPTICAL FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

WIPO Patent Application WO/2010/041513

A1

Disclosed is an optical film having improved moisture absorption, heat resistance and brittleness at the same time.  The optical film rarely causes light leakage, and has good reworkability.  Also disclosed are a method for producing the optical film, a polarizing plate and a liquid crystal display device. The optical film is characterized in that the film contains an acrylic resin (A) and a cellulose ester resin (B) at a mass ratio of from 95:5 to 30:70, that the acrylic resin (A) has a weight average molecular weight Mw of not less than 110,000 but not more than 1,000,000, that the total degree of substitution (T) of acyl groups of the cellulose ester resin (B) is not less than 2.0 but not more than 3.0, and the substitution degree of acyl groups having 3-7 carbon atoms is not less than 1.2 but not more than 3.0, that the cellulose ester resin (B) has a weight average molecular weight Mw of not less than 75,000 but not more than 300,000, that the film has a tension softening point of 105-145˚C and a folding endurance of 50-100 times, and that the film is produced by melt casting.

TAMAGAWA MINORI (JP)

PCT/JP2009/064122

April 15, 2010

August 10, 2009

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KONICA MINOLTA OPTO INC (JP)
TAMAGAWA MINORI (JP)

B29C48/305; B29C55/02; C08J5/18; G02B5/30; G02F1/1335; B29C48/08; B29K1/00; B29K79/00; B29L7/00; B29L11/00

WO2008062610A1	2008-05-29
WO2009047924A1	2009-04-16
WO2009096070A1	2009-08-06

JP2007231157A	2007-09-13
JP2002356658A	2002-12-13
JPH10316767A	1998-12-02
JP2009179731A	2009-08-13

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