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Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

A technology of liquid crystal alignment agent and repeating unit, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problem of insufficient improvement of screen burn-in, and achieve excellent liquid crystal orientation control and excellent coating properties

Active Publication Date: 2009-09-30
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with this technique, the improvement in burn-in when thermal stress is applied is still not good enough

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0226] Synthesis Example 1 (Synthesis (1) of Compound (1'))

[0227] Tocopheryl methacrylate is synthesized according to the following reaction scheme 1.

[0228]

[0229] Reaction scheme 1

[0230] Dissolve 89g of α-tocopherol in 800ml of dehydrated tetrahydrofuran (THF), add 27g of triethylamine, slowly add 36g of methacryloyl chloride dropwise, and stir at room temperature for 3 hours to carry out the reaction. After completion of the reaction, triethylamine hydrochloride was removed by filtration, THF was distilled off under reduced pressure, and then 400 ml of chloroform was added. This solution was washed with water, and the organic layer was dried over magnesium sulfate, and then chloroform was distilled off under reduced pressure to obtain 85 g of the target product α-tocopheryl methacrylate (yield: 83%).

Synthetic example 2

[0231] Synthesis Example 2 (Synthesis (2) of Compound (1'))

[0232] Tocopheryl acrylate is synthesized according to the following reaction scheme 2.

[0233]

[0234] Reaction Scheme 2

[0235] In the above Synthesis Example 1, except that 32 g of acryloyl chloride was used instead of methacryloyl chloride, 80 g of the target product α-tocopheryl acrylate was obtained in the same manner as in Synthesis Example 1 (yield: 80%).

Synthetic example 3

[0236] Synthesis Example 3 (Synthesis (1) of Polymer (1))

[0237] In a four-necked flask equipped with a stirring bar, a three-way valve and a thermometer, add 33 g (0.066 moles) of α-tocopheryl methacrylate prepared in the above-mentioned Synthesis Example 1, glycidyl methacrylate Esters 25g (0.18 moles), methacrylic acid 14g (0.16 moles), styrene 7.0g (0.067 moles), N-cyclohexylmaleimide 7.0g (0.039 moles) and 2-hydroxyethyl methacrylate 14g (0.11 moles), then add 200 g of diethylene glycol ethyl methyl ether as a solvent, 2,2'-azobis(2,4-dimethylvaleronitrile) 4.5 g as a polymerization initiator and molecular weight adjustment α-methylstyrene dimer 2.0g. This was bubbled with a nitrogen stream for about 10 minutes to ventilate the system with nitrogen, and then reacted at 70° C. for 5 hours under a nitrogen atmosphere to obtain a solution containing 32% by weight of the polymer (1-1). The molecular weight of the polymer (1-1) was measured by GPC, Mw=24000, Mw / Mn=2.4, and...

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Abstract

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. The present invention provides the liquid crystal alignment agent which can form the liquid crystal alignment film that represents excellent liquid crystal alignment controlling force (tile angle expressiveness of liquid crystal) and can restrain the DC accumulation when exerted with heat stress that is taken as a main reason of liquid crystal panel hot-damage. The liquid crystal alignment agent comprises the polymer of specific repetitive elements represented by the right formula (1-1) and at least one polymer selected from a group which is composed of polyamic acid and the imidization polymer thereof, wherein the polyamic acid is obtained through the reaction between the tetracarboxylic dianhydride and the diamine. In the formula (1-1), R is hydrogen atom or methyl.

Description

technical field [0001] The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. More specifically, it relates to a liquid crystal aligning agent that can form a liquid crystal aligning film that exhibits excellent liquid crystal alignment control ability (pretilt angle expression) and can suppress the accumulation of residual DC when thermal stress is applied, and a liquid crystal aligning agent formed from the liquid crystal aligning agent. A liquid crystal alignment film, and a liquid crystal display element having the liquid crystal alignment film. Background technique [0002] Since liquid crystal calculators began to be mass-produced, liquid crystal display elements have been used in clocks, portable game machines, word processors, notebook personal computers, car navigators, video cameras, portable Information terminals, digital cameras, mobile phones, various monitors, LCD TVs, etc. are widely used...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08L33/14C08G73/10G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 小山贵由宫本佳和林英治
Owner JSR CORPORATIOON
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