LAMINATED OPTICAL FILM AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a laminated optical film having superior internal haze prevention property and dimension stability, and having an appropriate retardation expression property.SOLUTION: This laminated optical film is formed by laminating a cellulose ester resin A layer, a cellulose es...

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Bibliographische Detailangaben
1. Verfasser:	YAMADA RUMIKO
Format:	Patent
Sprache:	eng
Schlagworte:	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 LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PERFORMING OPERATIONS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a laminated optical film having superior internal haze prevention property and dimension stability, and having an appropriate retardation expression property.SOLUTION: This laminated optical film is formed by laminating a cellulose ester resin A layer, a cellulose ester resin B layer and a thermoplastic resin C layer (hereinafter, referred to as "A layer", "B layer" and "C layer" respectively) in order of the A layer, the C layer, the B layer, the C layer, and the A layer. The average degree of substitution of cellulose ester of the A layer with acyl group is within the range of 2.8-3.0, and the average degree of substitution of cellulose ester of the B layer with acyl group is within the range of 1.0-2.5. Assuming that the thickness obtained by adding the two A layers sandwiching the B layer and the C layer is defined as At, the thickness obtained by adding all the thicknesses of the C layers sandwiching the B layer is defined as Ct, the thickness of the B layer is defined as Bt, and the total layer thickness (At+Bt+Ct) is defined as Tt, the At, Bt, Ct and Tt satisfy a specific expression.