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

A technology of liquid crystallinity and performance, applied in the field of liquid crystal display elements, it can solve the problems of dust, static electricity, inability to achieve uniform alignment of liquid crystals, and uniform rubbing of liquid crystal alignment films, and achieve high efficiency and excellent electrical properties.

Pending Publication Date: 2018-08-03
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the rubbing method of rubbing the surface of a liquid crystal alignment film made of polyimide or the like, there are problems of generation of dust and static electricity.
In addition, due to the high-definition of liquid crystal display elements in recent years, the electrodes on the corresponding substrate, and the unevenness generated by the switching active elements for liquid crystal driving, it is impossible to rub the surface of the liquid crystal alignment film evenly with a cloth, and it is impossible to achieve liquid crystal alignment. uniform orientation

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0228] [Preparation of polymer composition]

[0229] The polymer composition of the present invention is obtained by bringing a composition containing a photosensitive side chain type polymer as the component (A) and an organic solvent as the component (B) into contact with an ion exchange resin.

[0230] As the ion exchange resin, either a cation exchange resin or an anion exchange resin can be used.

[0231] The cation exchange resin is not particularly limited, and may be a strongly acidic cation exchange resin or a weakly acidic cation exchange resin. Examples of commonly used, for example, commercially available hydrogen-form cation exchange resins are shown below. Examples of strong acid ion exchange resins include ion exchange resins having sulfinic acid groups (sulfonated products of cross-linked polystyrene such as styrene-divinylbenzene copolymers), sulfinic acid group (or -CF 2 CF 2 SO 3H group), Nafion (manufactured by DuPont), DIAION SK series, DIAION UBK seri...

Embodiment

[0302] The methacrylic monomers M1 and M2 used in the examples are shown below.

[0303] In addition, M1 and M2 were respectively synthesized as follows. That is, M1 was synthesized by the synthesis method described in the patent document (WO2011-084546). M2 was synthesized by the synthesis method described in the patent document (Japanese Patent Laid-Open No. 9-118717).

[0304]

[0305] In addition, the abbreviations of the reagents used in this example are shown below.

[0306] (Organic solvents)

[0307] THF: Tetrahydrofuran.

[0308] NMP: N-ethyl-2-pyrrolidone.

[0309] BCS: Butyl Cellosolve

[0310] (polymerization initiator)

[0311] AIBN: 2,2'-azobisisobutyronitrile.

[0312]

[0313] M1 (3.98 g) and M2 (5.51 g) were dissolved in THF (40.0 g), and after degassing with a diaphragm pump, AIBN (0.24 g) was added and degassed again. Then, it was made to react at 60 degreeC for 6 hours, and the polymer solution of the methacrylate was obtained. This polymer solu...

Embodiment 2～8

[0319] Polymer solution PC1 was processed by the method similar to Example 1 with the ion-exchange resin quantity shown in Table 1, and the liquid crystal aligning agents T2-T8 of Examples 2-8 were obtained.

[0320] [Table 1]

[0321]

[0322]

[0323] After filtering the liquid crystal aligning agent (T1) obtained in Example 1 with a filter of 0.45 μm, it was spin-coated on a glass substrate with a transparent electrode, and dried on a hot plate at 70° C. for 90 seconds to form a film with a film thickness of 100 nm. Liquid crystal alignment film. Next, irradiate the coating surface with 15mJ / cm of 313nm ultraviolet rays through a polarizing plate 2 Then, it heated for 10 minutes on the hot plate of 140 degreeC, and obtained the board|substrate with a liquid crystal aligning film. Prepare two such substrates with a liquid crystal alignment film, place a 6 μm spacer on the liquid crystal alignment film surface of one substrate, combine the two substrates so that the ru...

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Abstract

The present invention provides: a highly efficient liquid crystal alignment film having alignment control performance applied thereto and having excellent characteristics such as voltage retention rate; a polymer composition to which same is applied; and an in-plane switching liquid crystal display element. The present invention provides a production method for a substrate including the liquid crystal alignment film, said method having: a step in which a polymer composition is coated upon a substrate having a conductive film for in-plane switching and a coating film is formed, said polymer composition being obtained by causing a composition to come in contact with an ion exchange resin, said composition containing a photosensitive side-chain polymer (A) exhibiting liquid crystal propertiesin a prescribed temperature range and an organic solvent (B); a step in which polarized ultraviolet rays are irradiated upon the obtained coating film; and a step in which the obtained coating film is heated.

Description

technical field [0001] The present invention relates to a novel liquid crystal aligning agent, a liquid crystal aligning film obtained therefrom, and a liquid crystal display element having the same. The liquid crystal display element obtained by the present invention has excellent electrical characteristics. Background technique [0002] Liquid crystal display elements are known as light-weight, thin and low-power-consumption display devices, and have been used in large-scale television applications and the like in recent years, achieving remarkable development. The liquid crystal display element is constituted, for example, by sandwiching a liquid crystal layer between a pair of transparent substrates provided with electrodes. And, in a liquid crystal display element, an organic film formed of an organic material is used as a liquid crystal alignment film to make liquid crystals exhibit a desired alignment state between substrates. [0003] That is, the liquid crystal al...

Claims

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Application Information

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IPC IPC(8): C08L101/12C08F6/00G02F1/1337
CPCC08F6/00C08L101/12G02F1/1337C09K19/38C09K19/56
Inventor 根木隆之名木达哉永井健太郎别府功一朗
Owner NISSAN CHEM IND LTD
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