POLYMER FILM, RETARDATION FILM, METHOD FOR PRODUCING RETARDATION FILM AND OPTICAL COMPENSATION POLARIZING PLATE BY USING THE RETARDATION FILM

PROBLEM TO BE SOLVED: To provide a retardation film having the larger retardation value as the wave length becomes the longer as a single film and also having ≤±4% changing rate of the in-plane directional retardation value (Re) in width direction. SOLUTION: This polymer film consisting mainly of a...

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Hauptverfasser:	SHIRAFUJI FUMIAKI, KURIMOTO KENJI, SHINTAKU MASAHITO
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 retardation film having the larger retardation value as the wave length becomes the longer as a single film and also having ≤±4% changing rate of the in-plane directional retardation value (Re) in width direction. SOLUTION: This polymer film consisting mainly of a cellulose acetate propionate is characterized in that the degree of acetyl substitution (DSac) and the degree of propionyl substitution (DSpr) of the cellulose acetate propionate satisfy formulae: 2.0≤DSac+DSpr