LIQUID CRYSTAL, OPTICAL MATERIAL FOR THERMAL WRITING USING SIDE-CHAIN LIQUID CRYSTAL COPOLYMER

PROBLEM TO BE SOLVED: To provide a liquid crystal optical material showing a reversible optical switching memory function in which heat-mode writing using a thermal electro-optic effect and erasing by an electric field effect can be performed, having a stable memory function in a wide temperature ra...

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Hauptverfasser:	KAJIYAMA CHISATO, YO KAI, MURATA TAKASHIGE, YAMANE YAMATO, KIKUCHI HIROTSUGU
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY 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 DYES FREQUENCY-CHANGING MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PAINTS PHYSICS POLISHES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a liquid crystal optical material showing a reversible optical switching memory function in which heat-mode writing using a thermal electro-optic effect and erasing by an electric field effect can be performed, having a stable memory function in a wide temperature range including room temperature, making fast thermal writing possible with low output by laser light and having high contrast. SOLUTION: The liquid crystal optical material consists of a ternary composite system consisting of a side-chain liquid crystal copolymer, low mol.wt. liquid crystal and chiral dopant, or a quaternary or pentanary composite system with addition of a polymer network formed from a photopolymerizable monomer and/or a thermosensitive dye to the ternary composite system. A preferable example of the side-chain liquid crystal copolymer is expressed by the following general formula I. In formula I, m is an integer 3 to 10, x+y is an integer 10 to 15, and x/y ranges (5 to 50)/(95 to 50).