POLYIMIDES POUR ANCRAGE DE CRISTAUX LIQUIDES, DISPOSITIFS D'AFFICHAGE LES INCLUANT ET PROCEDE DE PREPARATION DE CES DISPOSITIFS

• Main Authors: DUBOIS JEAN CLAUDE, LE MOIGNE JACQUES, DOZOV IVAN N, LAMARQUE SANRINE, GALLAIRE DIDIER
• Format: Patent
• Language: French
• Published: 06.12.2002
• Edition: 7
• Subjects: ADHESIVES; 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; DYES; FREQUENCY-CHANGING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LAKES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PHYSICS; POLISHES; 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

The invention relates novel polyimides derived from 6FDA and 3,3-dihydroxy-4,4'-diamino-biphznyl, in addition to novel polyimides derived from PMDA and Bis-AP-AF, comprising lateral groups of, aryl-alkyl, heteroaryl-alkyl, cycloalkyl-alkyl, fluoroalkyl or siloxane. The invention further comprises a method for the production of nematic liquid crystal devices, characterized in that it comprises the following steps: a substrate of one of the polyamides according to the invention is deposited; the polyimide is post-cured in one or two steps; an azimuthal orientation is defined for the polyimide deposit. La présente invention concerne des nouveaux polyimides dérivés du 6FDA et du 3, 3-dihydroxy-4,4'-diamino-biphényle, et des nouveaux polyimides dérivés du PMDA et du Bis-AP-AF, comportant des groupements latéraux alkyle, aryl-alkyle, hétéroaryl-alkyle, cycloalkyl-alkyle, fluoroalkyle ou siloxane.La présente invention concerne également un procédé de réalisation de dispositifs à cristaux liquides nématiques, caractérisé par le fait qu'il comprend les étapes consistant à :. déposer un substrat d'un des polyimides, selon l'invention,. effectuer un recuit du polyimide en une ou plusieurs étapes,. définir une orientation azimutale du dépôt de polyimide.