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Process for preparing optical orientation film

A photo-alignment film and photo-alignment technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of loss of alignment state, structural obstruction, inability to maintain liquid crystal alignment function, etc., and achieve the effect of excellent stability

Inactive Publication Date: 2002-07-03
THE HONG KONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in a film having a structure in which a structural unit having dichroism is inserted into a resin, when the structural unit having dichroism is rearranged and oriented by polarized light, the existence of this structure hinders and sufficient orientation cannot be obtained. The problem
On the other hand, a film made of a resin having a dichroic structural unit in the side chain can improve the above-mentioned problems to some extent, but the orientation direction of the dichroic structural unit is not completely controlled. Fixed, so there is a problem that the alignment state of the structural unit is gradually lost due to heat or light, and the liquid crystal alignment function cannot be maintained for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The material for photo-alignment films used in the production method of the present invention contains a dichroic dye having two or more polymerizable groups in one molecule. Among the dichroic dyes having two or more polymerizable groups in one molecule, the so-called dichroic dyes are dyes in which the ability to absorb light as a chromophoric group differs depending on the direction of the electric vector of polarized light. Among dichroic dyes, there are, for example, anthraquinones, azos, quiphthalones, and northern dyes. Among them, azo dyes or anthraquinones show particularly excellent photo-orientability by irradiating polarized light, so Especially ideal. The azo dye or anthraquinone dye before introducing the polymerizable group is not particularly limited as long as it can be used as a dichroic dye.

[0015] The dichroic dye having a polymerizable group used in the present invention can be, for example, prepared by making a dichroic dye having a hydroxyl gro...

Embodiment 1～8

[0054] A photo-alignment film was formed using the materials for photo-alignment films of the compounds obtained in Synthesis Examples 1 to 6, and the orientation, charge retention, and durability of liquid crystals were evaluated. The specific test process is as follows. (Manufacturing method of photo-alignment film) a-1. Preparation of material solution for photo-alignment film (for photopolymerization)

[0055] To 99 parts by mass of the compound obtained in the synthesis example and the comparative synthesis example, 1 part by mass of the photopolymerization initiator "Irugakiua-651" (manufactured by Tibagaigie Co., Ltd.) was added and dissolved in dimethylformamide to obtain the nonvolatile component 5 mass % solution. This solution was filtered through a 0.1 μm filter to obtain a material solution for a photo-alignment film. a-2. Preparation of material solution for photo-alignment film (for thermal polymerization)

[0056] To 99 parts by mass of compounds obtained in...

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Abstract

A process for preparing optical orientation film include coating the raw material containing dichroic dye whose molecule has more than 2 polymeric groups on a substrate, radiating it with polarized light to make it have orientation function, and heating of light radiating to polymerizing said groups. It has high and durable optical or thermal stability.

Description

technical field [0001] The present invention relates to a method for preparing a photo-alignment film used in a liquid crystal display element. More specifically, the present invention relates to a method for preparing a photo-alignment film capable of aligning liquid crystal molecules without rubbing by irradiating light. Background technique [0002] In a liquid crystal display device, the alignment state of liquid crystal molecules is changed by the action of an electric field or the like, and a display is performed using a change in optical characteristics accompanying the change. In most cases, the liquid crystal is used in a state sandwiched between two substrates, and in order to arrange the liquid crystal molecules in a specific direction, it is necessary to perform alignment treatment inside the substrate. [0003] Orientation treatment generally employs a method called rubbing, in which a polymer film such as polyimide is provided on a substrate such as glass and r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/46G02F1/1337
CPCG02F1/133788Y10T428/1005C09K2323/02G02F1/1337
Inventor 叶永超叶连娜·K·普罗特尼科娃郭海成弗拉基米尔·G·西尔格利诺夫弗拉基米尔·M·柯曾科夫高田宏和福田昌宣
Owner THE HONG KONG UNIV OF SCI & TECH
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