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Method for producing liquid crystal alignment film, liquid crystal alignment film, liquid crystal display element, and liquid crystal alignment agent

A liquid crystal alignment film and liquid crystal alignment agent technology, applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of lower firing temperature, inability to use heat resistance, low substrate, etc., and achieve reduced energy costs and low residual DC , The effect of high voltage retention

Active Publication Date: 2017-11-28
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the formation of such a liquid crystal aligning film, problems such as the inability to use a substrate with low heat resistance when the firing temperature is high, it is desired to lower the firing temperature

Method used

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  • Method for producing liquid crystal alignment film, liquid crystal alignment film, liquid crystal display element, and liquid crystal alignment agent
  • Method for producing liquid crystal alignment film, liquid crystal alignment film, liquid crystal display element, and liquid crystal alignment agent
  • Method for producing liquid crystal alignment film, liquid crystal alignment film, liquid crystal display element, and liquid crystal alignment agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0182] Examples are given below and described. In addition, the present invention is not limitedly interpreted by them. The abbreviations used below are as follows.

[0183] (diisocyanate)

[0184] A-1: Tolyl 2,4-diisocyanate

[0185] (tetracarboxylic dianhydride)

[0186] B-1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0187] (diamine compound)

[0188] C-1: 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane

[0189] C-2: N-(3-pyridylmethyl)-3,5-diaminobenzamide

[0190] C-3: 1,3-diamino-4-{4-(4-n-heptylcyclohexyl)phenoxy}benzene

[0191] (Organic solvents)

[0192] NMP: N-methyl-2-pyrrolidone

[0193] BCS: Butyl Cellosolve

[0194] The measurement method performed in this example is shown below.

[0195] (Molecular weight determination of polymer)

[0196] The molecular weights of polyamic acid and polyimide are calculated by measuring the polyamic acid and polyimide with a GPC (room temperature gel permeation chromatography) device, and calculating them as p...

Synthetic example 1

[0209] Mix A-1 (1.56g, 9.00mmol), C-1 (1.53g, 8.98mmol), C-2 (1.30g, 5.36mmol), C-3 (1.37g, 3.59mmol) in NMP (23g) , after reacting at 40°C for 15 hours, add B-1 (1.65g, 8.46mmol), NMP (19g), and then react for 6 hours to obtain polymer solution A (having the repeating unit represented by the above formula [1] Polyamic acid solution) (polymer concentration: 15% by mass). The polymer had a number average molecular weight of 16,020 and a weight average molecular weight of 49,319.

Synthetic example 2

[0211] Mix A-1 (0.783g, 4.50mmol), C-1 (1.53g, 8.98mmol), C-2 (1.30g, 5.36mmol), C-3 (1.37g, 3.59mmol) in NMP (19g) , after reacting at 40°C for 15 hours, add B-1 (2.63g, 13.4mmol), NMP (23g), and then react for 6 hours to obtain polymer solution B (having the repeating unit represented by the above formula [1] Polyamic acid solution) (polymer concentration: 15% by mass). The polymer had a number average molecular weight of 11,555 and a weight average molecular weight of 37,656.

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Abstract

A liquid-crystal alignment agent is applied to a substrate and subsequently baked to obtain a liquid-crystal alignment film having an imidization ratio of 50-70%. The liquid-crystal alignment agent includes: a polyimide precursor having repeating units represent by formula [1]; and at least one polymer selected from polyimides which have repeating units represented by formula [1], and which have an imidization ratio of less than 50% (in formula [1]: A1 represents a divalent organic group; A2 represents a divalent organic group; and C1 and C2 each represent hydrogen or a C1-3 alkyl group, and may be the same as or different to each other).

Description

technical field [0001] This invention relates to the manufacturing method of a liquid crystal aligning film, a liquid crystal aligning film, a liquid crystal display element using a liquid crystal aligning film, and a liquid crystal aligning agent used for producing a liquid crystal aligning film. Background technique [0002] Liquid crystal display elements used in liquid crystal televisions, liquid crystal displays, and the like are currently widely used as display devices for realizing thin and light weight display devices. In a liquid crystal display element, a liquid crystal aligning film plays a role of aligning a liquid crystal in a certain direction. Today, the main liquid crystal aligning film used in industry is coated with a liquid crystal aligning agent containing a solution of polyimide precursor, namely polyamic acid (also called polyamic acid), polyamic acid ester, and polyimide. Distributed on the substrate and fired to form. [0003] In formation of such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/10G02F1/133723G02F1/133715
Inventor 巴幸司菊池奈穂片山雅章三木徳俊
Owner NISSAN CHEM IND LTD
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