Optical film, method for producing same, polarizing plate and liquid crystal display device

Provided is a method for producing an optical film, which comprises: a step wherein a multilayer film, which comprises a core layer that is formed from a resin A and a surface layer that is formed from a resin B and is arranged on a surface of the core layer, is obtained by co-extruding the resin A...

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Bibliographische Detailangaben
Hauptverfasser:	TSUJINO, TOMA, SHU, HIROAKI
Format:	Patent
Sprache:	chi ; 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 MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS 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:	Provided is a method for producing an optical film, which comprises: a step wherein a multilayer film, which comprises a core layer that is formed from a resin A and a surface layer that is formed from a resin B and is arranged on a surface of the core layer, is obtained by co-extruding the resin A and the resin B; and a step wherein the surface layer is separated from the multilayer film. Also provided is an optical film which contains a specific block copolymer. The optical film has an absolute value of the retardation in the in-plane direction of 5 nm or less, an absolute value of the retardation in the thickness direction of 10 nm or less, and a water vapor transmission rate of 20 g/(m2·day) or less.