LIQUID CRYSTAL ALIGNING AGENT FOR PHOTO-ALIGNMENT, LIQUID CRYSTAL ALIGNMENT FILM AND LIQUID CRYSTAL DISPLAY ELEMENT USING THE SAME

• Main Authors: IZAWA KEISUKE, KOSEKI YOHEI, KAMBARA TAKEHIKO
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• 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 film having high stability to light and achieving a higher contrast when applied to a liquid crystal display element, and a liquid crystal aligning agent that allows formation of the above liquid crystal alignment film.SOLUTION: A liquid crystal aligning agent for photo-alignment is provided, which contains a polymer component that has a structural unit including a photoreactive structure. The polymer component comprises a polymer or its derivative obtained by polymerizing a monomer composition containing at least a first monomer and a second monomer. The first monomer includes a photoreactive structure in a moiety forming the structural unit of the polymer, in which the moiety forming the structural unit of the polymer induces a chemical reaction by heating. The second monomer includes a photoreactive structure in a moiety forming the structural unit of the polymer, in which the moiety forming the structural unit of the polymer does not induce a chemical reaction by heating.SELECTED DRAWING: None 【課題】光に対して安定性が高く、且つ、液晶表示素子に適用したとき、より高いコントラストを実現する液晶配向膜、および、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】光反応性構造を含む構成単位を有するポリマー成分を含有する光配向用液晶配向剤であって、ポリマー成分は、少なくとも第１のモノマーおよび第２のモノマーを含有するモノマー組成物を重合させてなる重合体またはその誘導体からなり、第１のモノマーは、重合体の構成単位を形成する部分に光反応性構造を含み、且つ、重合体の構成単位を形成する部分が加熱により化学反応を起こすものであり、第２のモノマーは、重合体の構成単位を形成する部分に光反応性構造を含み、且つ、重合体の構成単位を形成する部分が加熱による化学反応を起こさないものである。【選択図】なし