OPTICAL FILM, METHOD FOR MANUFACTURING THE SAME, AND PHASE DIFFERENCE FILM AND POLARIZING PLATE USING THE SAME

• Main Authors: KAWAI, MASAYUKI, YANO, SHUUJI, MURAKAMI, NAO, YAMAOKA, TAKASHI, ADACHI, JUNICHI, WASAI, KANAKO
• Format: Patent
• Language: English; French; Japanese
• Published: 31.07.2003
• Edition: 7
• Subjects: 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 TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A method for preparing an optical film, which comprises applying and developing an application liquid mixture containing a liquid crystal monomer, a chiral agent and a polymerization initiator on an orientation substrate, subjecting the resultant developed layer to a heat treatment, to orient the monomer to a cholesteric structure, and then subjecting the developed layer to a poltmerization treatment, to polymerize the oriented liquid crystal monomer, thereby forming an optical film exhibiting a selective reflection wave length of 100 to 320 nm. An optical film prepared by the above method is reduced in the coloring due to selective reflection. Cette invention concerne un procédé de fabrication de film optique, consistant à : appliquer et à développer un mélange liquide d'application renfermant un monomère cristallin liquide, un agent chiral et un déclencheur de polymérisation sur un substrat d'orientation ; soumettre la couche résultante développée à un traitement thermique pour orienter le monomère vers une structure cholestérique ; soumettre enfin la couche développée à un traitement de polymérisation dans le but de polymériser le monomère cristallin liquide orienté et de former par là même un film optique présentant une longueur d'onde de réflexion sélective comprise entre 10 et 320 nm. Un film optique obtenu selon ce procédé présente une coloration réduite à cause de la réflexion sélective.