CELLULOSE ESTER FILM

PROBLEM TO BE SOLVED: To provide a cellulose ester film excellent in optical isotropy, particularly in optical isotropy in a direction of film thickness, and to provide a method for producing the cellulose ester film, a polarizing plate for a display device, and the display device.SOLUTION: A cellul...

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Hauptverfasser:	KANEKO TADAHIRO, MURAKAMI TAKASHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING GENERAL PROCESSES OF COMPOUNDING METALLURGY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a cellulose ester film excellent in optical isotropy, particularly in optical isotropy in a direction of film thickness, and to provide a method for producing the cellulose ester film, a polarizing plate for a display device, and the display device.SOLUTION: A cellulose ester film has planar orientation degree S represented by a following formula (I) of 0.0004 or less, and has retardation Rt in a direction of film thickness of less than 10 nm. The formula (I) is S=(Nx+Ny)/2-Nz, Rt=((Nx+Ny)/2-Nz)*d. In this formula, Nx represents a refractive index in a slow axis direction in a cellulose ester film plane, Ny represents a refractive index in a film plane in a direction perpendicular to the slow axis direction, Nz represents a refractive index in a thickness direction of the film, and d represents film thickness (nm) of the cellulose ester film.