LIQUID CRYSTAL ALIGNING AGENT FOR OPTICAL ALIGNMENT FOR FORMING OPTICAL ALIGNMENT TYPE LIQUID CRYSTAL ALIGNMENT MEMBRANE, LIQUID CRYSTAL ALIGNMENT MEMBRANE, AND LIQUID CRYSTAL ELEMENT USING THE SAME

• Main Author: OZAKI TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 03.04.2023
• Subjects: 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; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a liquid crystal alignment membrane having excellent contrast and afterimage characteristics, and capable of forming a liquid crystal display element that maintains a high voltage holding ratio and does not degrade display quality even when exposed to strong light for a long period, and a liquid crystal alignment agent capable of forming the liquid crystal alignment membrane.SOLUTION: A liquid crystal alignment agent for optical alignment contains a polymer and a solvent obtained by reacting a tetracarboxylic acid derivative and diamines, and a raw material composition of the polymer contains at least one compound represented by the formula (1) and a compound having a photoreactive structure that imparts liquid crystal orientation to an alignment membrane by a photoreaction. In the formula (1), A1 is independently -CH3 and the like, and a1 is independently 0-2.SELECTED DRAWING: None 【課題】良好なコントラストおよび残像特性を有し、長時間強い光に晒されても、高い電圧保持率が維持されて表示品位が低下しない液晶表示素子を形成できる液晶配向膜を提供すること、そのような液晶配向膜を形成できる液晶配向剤を提供すること。【解決手段】テトラカルボン酸誘導体とジアミン類を反応させてなるポリマーと溶剤とを含む光配向用液晶配向剤であって、前記ポリマーの原料組成物に、式（１）で表される化合物の少なくとも１つと、光反応により配向膜に液晶配向性を付与する光反応性構造を有する化合物を含む光配向用液晶配向剤。TIFF2023046261000169.tif2585式（１）中、Ａ１は独立して－ＣＨ３等であり、ａ１は独立して０～２である。【選択図】なし