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

A technology of liquid crystal alignment film and liquid crystal, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of increased power consumption, etc., and achieve the effects of high adhesion, high vertical orientation, and good optical properties

Active Publication Date: 2021-11-12
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this standard type element needs to constantly apply a voltage in order to obtain a transmissive state. Therefore, when it is used in applications that are mostly used in a transparent state, such as window glass, the power consumption becomes large.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0368] The following examples are given to illustrate the present invention in more detail, but the present invention is not limited to them. Abbreviations of compounds used in Synthesis Examples, Examples, and Comparative Examples are as follows.

[0369]

[0370] (liquid crystal)

[0371] L1: MLC-6608 (manufactured by Merck Corporation)

[0372] (polymerizable compound): following formula [R1]

[0373] (Photoinitiator): following formula [P1]

[0374]

[0375] (specific side chain type diamine)

[0376] A1: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxy]benzene

[0377] A2: 1,3-diamino-4-[4-(trans-4-n-heptylcyclohexyl)phenoxymethyl]benzene

[0378] A3: 1,3-diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene

[0379] A4: A compound represented by the following formula [A4]

[0380] A5: 1,3-diamino-4-octadecyloxybenzene

[0381]

[0382] (second diamine)

[0383]

[0384] (other diamines)

[0385]

[0386] (tetracarboxylic a...

Synthetic example 1

[0426] Mix D1 (2.96g, 15.1mmol), A1 (2.91g, 7.65mmol), B1 (0.93g, 6.11mmol) and C2 (0.17g, 1.57mmol) in NEP (21.0g) and react at 40°C for 8 hours , thereby obtaining a polyamic acid solution (1) having a resin solid content concentration (Rs) of 25% by mass. The number average molecular weight (Mn) of this polyamic acid was 23600, and the weight average molecular weight (Mw) was 71800.

Synthetic example 2

[0428] Mix D2 (3.83g, 15.3mmol), A2 (6.04g, 15.3mmol) and B1 (2.33g, 15.3mmol) in NMP (26.4g), react at 50°C for 2 hours, add D1 (2.94g, 15.0 mmol) and NMP (23.8 g) were reacted at 40° C. for 6 hours to obtain a polyamic acid solution (2) whose Rs was 25% by mass. Mn of this polyamic acid was 22500, and Mw was 67100.

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Abstract

A liquid crystal display element having a liquid crystal layer between a pair of substrates provided with electrodes and obtained by arranging between the pair of substrates including performing polymerization by at least one of active energy rays and heat A liquid crystal composition of a polymerizable compound, and further, at least one of the substrates is provided with a liquid crystal alignment film for vertically aligning liquid crystals, and the above-mentioned liquid crystal composition is solidified in a state where a part or all of the liquid crystal composition shows liquid crystallinity, forming a liquid crystal and polymerizing A cured product composite of a neutral compound, thereby obtaining the liquid crystal display element, the aforementioned liquid crystal aligning film comprising a liquid crystal aligning film obtained from a liquid crystal aligning agent, the liquid crystal aligning agent comprising a solvent represented by the following formula [1], And it contains the polymer which has at least 1 structure selected from the group which consists of the structure shown by following formula [2-1] and a formula [2-2]. Formula [1] (S 1 and S 2 represents an alkyl group having 1 to 4 carbon atoms. ) formula [2‑1] (Y 1 , Y 2 , Y 3 Indicates a single key, etc., Y 4 , Y 5 Represents benzene ring, etc., n represents 0~4, Y 6 represents an alkyl group having 1 to 18 carbon atoms, and the like. ) formula [2‑2] (Y 7 Indicates a single key, etc., Y 8 represents an alkyl group having 8 to 22 carbon atoms, and the like. )

Description

technical field [0001] The present invention relates to a transmissive-scattering type liquid crystal display element which exhibits a transparent state when no voltage is applied and a scattering state when voltage is applied, a liquid crystal alignment film used for the element, and a liquid crystal alignment treatment agent for forming the liquid crystal alignment film. Background technique [0002] As a liquid crystal display element using a liquid crystal material, a TN (twisted nematic) mode has been put into practical use. This mode uses the optical rotation characteristics of liquid crystals to switch light, and polarizers are required when used as liquid crystal display elements. However, light utilization efficiency becomes low due to the use of polarizers. [0003] As a liquid crystal display element that does not use a polarizer and has high light utilization efficiency, there is a liquid crystal display element that switches between a transmissive state (also c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08F2/00
CPCC08F2/48G02F1/1334G02F1/133711G02F1/133719G02F1/13347G02F1/133742
Inventor 三木徳俊大村浩之桥本淳保坂和義
Owner NISSAN CHEM IND LTD
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