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Liquid crystal orientating agent

A technology of liquid crystal aligning agent and liquid crystal aligning film, applied in the directions of liquid crystal materials, instruments, optics, etc., can solve the problems of insufficient inhibition and poor display quality, and achieve the effect of excellent properties

Active Publication Date: 2014-07-02
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with the technology of the same document, the degree of suppression of display quality deterioration is not sufficient during long-term continuous operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example

[0161] Synthesis Examples 1-42 and Comparative Synthesis Examples 1-6

[0162] The diamine of the kind and amount shown in Table 1 and tetracarboxylic dianhydride are mixed, add in the N-methyl-2-pyrrolidone of 135g and dissolve in this order, and form the total of diamine and tetracarboxylic dianhydride Weight is the solution of 10% by weight relative to the whole weight of reaction solution, it is reacted at 60 ℃ for 6 hours, obtains respectively 150g containing 10% by weight of polyamic acid (A-1)~(A-42) and ( R-1)~(R-6) solution.

[0163] The viscosities of the solutions obtained here are combined in Table 1 and shown.

[0164] [Synthesis of polyimide]

[0165] Synthesis Examples 43-65 and Comparative Synthesis Examples 7-12

[0166] The diamine and the tetracarboxylic dianhydride of the kind and amount shown in Table 2 are mixed, add in the N-methyl-2-pyrrolidone of 135g and dissolve in this order, and form the total of diamine and tetracarboxylic dianhydride The weig...

Synthetic example OPA-1

[0213] With 98g (0.50mol) 1,2,3,4-cyclobutanetetracarboxylic dianhydride and 110g (0.50mol) pyromellitic dianhydride as tetracarboxylic dianhydride and 200g (1.0mol) as diamine mol) 4,4′-diaminophenylmethane, dissolved in 2100g of mixed solvent formed by 230g of N-methyl-2-pyrrolidone and γ-butyrolactone, reacted at 40°C for 3 hours, and added 1,350 g of γ-butyrolactone to obtain a solution containing 10% by weight of polyamic acid (OPA-1). The solution viscosity of this polyamic acid solution was 125 mPa·s.

Synthetic example OPA-2

[0215] 200g (1.0mol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride as tetracarboxylic dianhydride and 210g (1.0mol) of diamine as 2,2'-dimethyl-4 , 4′-diaminobiphenyl, dissolved in a mixed solvent formed by 370g of N-methyl-2-pyrrolidone and 3300g of γ-butyrolactone, and reacted for 3 hours at 40°C to obtain 10% by weight poly Amic acid (OPA-2) solution. The solution viscosity of this polyamic acid solution was 160 mPa·s.

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Abstract

The invention provides a liquid crystal orientating agent, which can obtain good pretilt angle property through a light orientation method, and also can provide a liquid crystal orientating film which cannot cause property difference in long time continuous operation. The liquid crystal orientating agent comprises at least one polymer selected from a group consisting of polyamic acid prepared by reaction of tetracarboxylic dianhydride and diamine, and polyimide formed by closing-ring dehydration of the polyamic acid, wherein the tetracarboxylic dianhydride comprises at least one item selected from a group consisting of 3, 5, 6-3 carboxyl-2-carboxymethyl norbornene alkyl-2: 3, 5: 6-dianhydride and 2, 4, 6, 8-tetra-carboxyl bicyclo [3, 3, 0] octane-2: 4, 6: 8-dianhydride, and the diamine includes a diamine having a photoreactive structure.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent. More specifically, it is related with the liquid crystal aligning agent which can provide the liquid crystal aligning film of suitable performance even by the photo-alignment method with little light irradiation. Background technique [0002] At present, as operation modes of liquid crystal display elements, TN (twisted nematic) type, STN (super twisted nematic) type using liquid crystal molecules having positive dielectric anisotropy, etc., and using liquid crystal molecules having negative dielectric anisotropy are known. Liquid crystal display elements such as VA (vertical alignment) type liquid crystal display elements having electrically anisotropic liquid crystal molecules mainly use liquid crystal alignment films formed of organic films in order to control the alignment of various liquid crystal molecules (Patent Documents 1 to 4). [0003] The liquid crystal aligning films of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337C08G73/10
Inventor 中田正一林英治西川通则
Owner JSR CORPORATIOON
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