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Title:
OPTICAL COMPENSATION FILM FOR LIQUID CRYSTAL DISPLAY ELEMENT
Document Type and Number:
Japanese Patent JP2006053411
Kind Code:
A
Abstract:

To provide an optical compensation film for a liquid crystal display element excellent in heat resistance and exhibiting a small phase difference in the film plane and a large phase difference out the film plane.

The optical compensation film for a liquid crystal display element is obtained by laminating two optically anisotropic uniaxially-stretched films so that a narrow angle formed by a lagging axis in the film plane of one of the films and an advancing axis in the film plane of the other is set within a range of 0±10°, wherein the optically anisotropic uniaxially-stretched films each form negative birefringence and comprise 40-95 wt.% of a copolymer (a) comprising specific olefin residue units and specific N-phenyl substituted maleimide residue units and having a weight average molecular weight (expressed in terms of standard polystyrene) of 5×103 to 5×106, and 60-5 wt.% of an acrylonitrile-styrene copolymer (b) comprising acrylonitrile residue units and styrene residue units in a weight ratio of 20:80 to 35:65 and having a weight average molecular weight (expressed in terms of standard polystyrene) of 5×103 to 5×106.


Inventors:
OBARA NAOTO
TOYOMASU NOBUYUKI
Application Number:
JP2004235760A
Publication Date:
February 23, 2006
Filing Date:
August 13, 2004
Export Citation:
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Assignee:
TOSOH CORP
International Classes:
G02B5/30; B32B27/28; C08F210/00; C08F222/40; C08L23/00; C08L25/12; C08L35/00; G02F1/13363
Domestic Patent References:
JP2002341140A2002-11-27
JP2004177951A2004-06-24