PHOTOALIGNABLE POLYMER, PHOTOALIGNABLE COMPOSITION AND LIQUID CRYSTAL DISPLAY ELEMENT PROVIDED WITH ALIGNMENT FILM MADE FROM PHOTOALIGNABLE COMPOSITION

PROBLEM TO BE SOLVED: To obtain a photoalignable polymer excellent in heat stability and pretilt angle characteristics by using a self-photosensitive polyimide having a benzophenone component and a reactive hydrogen component and to obtain a liquid crystal display element having an alignment film pr...

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Hauptverfasser:	CHO RYUKEI, RYU KANSEI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS 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 ELECTROGRAPHY FREQUENCY-CHANGING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HOLOGRAPHY MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MATERIALS THEREFOR METALLURGY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS ORIGINALS THEREFOR PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES 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 THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a photoalignable polymer excellent in heat stability and pretilt angle characteristics by using a self-photosensitive polyimide having a benzophenone component and a reactive hydrogen component and to obtain a liquid crystal display element having an alignment film prepared not by a rubbing method. SOLUTION: A self-photosensitive polyimide improved in the thermal stability of photoalignment is obtained by simultaneously introducing a benzophenone component and a reactive hydrogen component into a heat-resistant polymer. This polyimide is represented by formula I (wherein R1 is formula II; A and B are each an unsubstituted aromatic ring; Y is O, S, N or free from a bond of -Y-; and R2 is E-CH2 -F (wherein E and F are each a single bond, an aromatic ring, a 3-10C cycloalkyl or the like) and is desirably one represented by formula I (wherein R1 is formula III or the like; and R2 is formula IV or the like). A polyamic acid synthesized from an acid anhydride and a diamine compound is mixed with a solvent to from a photoalignable composition, and this composition is applied to a glass substrate and imidated to make an alignment film.