TWI816930B

• Main Authors: KONISHI, REIKU, SUGA, TAKAHIRO, MIYAMOTO, YASUHIRO
• Format: Patent
• Language: Chinese
• Published: 01.10.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; 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; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; 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; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP

Provided are: a liquid crystal orientation agent for obtaining a liquid crystal orientation film used for photo-alignment methods with which good afterimage characteristics can be obtained even when negative liquid crystal is used without causing bright spots; a liquid crystal orientation film; and a liquid crystal display element. This liquid crystal orientation agent comprises at least one polymer selected from the group consisting of a polyimide precursor that has a structure represented by formula (1) in the main chain and an imidized polymer of the polyimide precursor. (R1 and R2 are a single bond, -O-, -S-, -NR12-, or the like; R12 is a hydrogen atom, or the like; A is an alkylene group having 2 to 20 carbon atoms; and B1 and B2 have the same structure and are a divalent organic group selected from the structures of chemical formula 2.) (R4 is an alkylene group having 1 to 5 carbon atoms; and R5 is a hydrogen atom, or the like.)