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Method for manufacturing liquid crystal alignment film, liquid crystal alignment film, optical film and image displaying display

A liquid crystal orientation and manufacturing method technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems of unstable and cheap axis accuracy, difficulty in obtaining oriented liquid crystal alignment layer, and difficult A-plate

Inactive Publication Date: 2008-06-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stretched polymer film produced by the conventional longitudinal stretching and transverse stretching methods cannot stably and inexpensively obtain the axial accuracy of ±1° or more in the width direction.
Therefore, the stretched polymer film is sometimes used as a C plate that does not require axial precision (when the refractive index of the plane is nx, ny, and the refractive index of the thickness direction is nz, or ) or alignment substrate for cholesteric liquid crystals, but it is difficult to use A-plates that require axial precision ( or ) in production
In addition, if the surface of the rubbed alignment film is contaminated before coating the liquid crystal material, the orientation of the liquid crystal material will be reduced, making it difficult to obtain a liquid crystal alignment layer with good orientation.
For example, after the substrate film is rubbed, when the surface of the rubbed alignment film is brought into contact with a roller or the like before the process of applying the liquid crystal material, the orientation of the liquid crystal material is reduced.
Therefore, in the manufacture method of the liquid crystal aligning film that has used rubbing aligning film, it is difficult to adopt the continuous production method by roll to roll (roll to roll)

Method used

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  • Method for manufacturing liquid crystal alignment film, liquid crystal alignment film, optical film and image displaying display
  • Method for manufacturing liquid crystal alignment film, liquid crystal alignment film, optical film and image displaying display
  • Method for manufacturing liquid crystal alignment film, liquid crystal alignment film, optical film and image displaying display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] After the surface of the triacetyl cellulose film was oriented by rubbing with a rayon cloth, a surface protection sheet with a peeling force of 0.05 N / 50 mm was attached immediately. As a surface protection sheet, Sekisui Chemical Co., Ltd. product 6221F was used. It is produced by co-extruding the substrate layer (thickness 50μm, polyethylene) and the adhesive layer (ethylene-ethyl acetate copolymer) of the surface protection sheet. Next, the surface protection sheet was peeled off (180° peeling) immediately before the liquid crystal material coating liquid was applied, and the coating liquid was coated on the orientation-treated surface using a wire rod #10. Dry at 90°C for 5 minutes to align the liquid crystal material, and then irradiate with a metal halide lamp at 1mJ / cm 2 The light solidifies the liquid crystal layer to obtain a liquid crystal alignment film with a thickness of 2 μm.

Embodiment 2

[0144] In Example 1, except having used the surface protection sheet whose peeling force was 0.1N / 50mm, it carried out similarly to Example 1, and obtained the liquid crystal aligning film. As the surface protection sheet, Santect PAC3 manufactured by Sane-Chem Co., Ltd. was used. It is produced by co-extruding the substrate layer (thickness 60 μm, polyethylene) and the adhesive layer (ethylene-ethyl acetate copolymer) of the surface protection sheet.

Embodiment 3

[0146] In Example 1, except having used the surface protection sheet whose peeling force was 0.3 N / 50mm, it carried out similarly to Example 1, and obtained the liquid crystal aligning film.

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Abstract

A method for manufacturing liquid crystal alignment film of the present invention comprises the steps of: (1) aligning a transparent substrate film by rubbing; (2) laminating a surface protective sheet having a release force of 0.5 N / 50 mm or less onto an aligned face of the transparent substrate; (3) coating a liquid crystal material comprising a liquid crystal monomer and / or a liquid crystal polymer onto the aligned face after releasing the surface protective sheet; and (4) fixing the liquid crystal material after aligning the liquid crystal material. The method can make satisfactorily align the liquid crystal material on the substrate.

Description

technical field [0001] The invention relates to a method for manufacturing a liquid crystal alignment film. Moreover, this invention relates to the optical film using the liquid crystal aligning film obtained by this manufacturing method, and this liquid crystal aligning film at least one sheet. The liquid crystal alignment film of the present invention can be used alone or in combination with other films as optical films such as retardation plates, viewing angle compensation films, optical compensation films, and elliptically polarizing films. Furthermore, the present invention also relates to image display devices such as liquid crystal display devices, electroluminescent display devices, and PDPs using the above-mentioned optical film. Background technique [0002] In recent years, retardation plates that control the phase of light have become one of the important optical elements in the fields of optics and optoelectronics. In addition, an elliptically polarizing plate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1333G02B5/30
Inventor 川本育郎上条卓史米泽秀行梅本清司
Owner NITTO DENKO CORP