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Title:
PHASE DIFFERENCE FILM, METHOD FOR PRODUCING SAME, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/165361
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a phase difference film whereby the features of a cellulose ester having an acyl group substitution degree less than 2.0 are employed and compatibility can be improved to thereby achieve significant phase difference performance even with a thin film thickness, and whereby high contrast and optical transmittance can be realized in a liquid crystal display device. The present invention also addresses the problem of providing a polarizing plate and liquid crystal display device equipped with the phase difference film. This phase difference film, containing a cellulose ester obtained by substituting the hydroxyl group of a glucose unit constituting cellulose with a C2 or higher acyl group, is characterized in satisfying a specific formula where the degree to which hydroxyl groups at the 2-position, the 3-position, and the 6-position in the glucose units are substituted by an acyl group are DS2, DS3, and DS6, respectively.

Inventors:
AKASAKA KAZUKI (JP)
Application Number:
PCT/JP2012/063585
Publication Date:
December 06, 2012
Filing Date:
May 28, 2012
Export Citation:
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Assignee:
KONICA MINOLTA ADVANCED LAYERS (JP)
AKASAKA KAZUKI (JP)
International Classes:
G02B5/30; C08J5/18; C08K5/10; C08L1/10; C08L33/00; G02F1/13363
Foreign References:
JP2009155555A2009-07-16
JP2011053645A2011-03-17
JP2009299075A2009-12-24
JP2009251094A2009-10-29
Attorney, Agent or Firm:
KOYO INTERNATIONAL PATENT FIRM (JP)
Patent business corporation Mitsuaki international patent firm (JP)
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