Phase contrast film and production method therefor

A retardation film and compound technology, applied in the direction of polarizing elements, etc., can solve the problems that it is difficult to control the refractive index of the retardation film, and the characteristics cannot be obtained, so as to achieve the effect of suppressing the occurrence of cracks

Active Publication Date: 2021-03-09
HAYASHI TELEMPU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is generally difficult to control the refractive index in the thickness direction of the retardation film. Due to the incidence angle dependence of the retardation value of light incident on the film, even if the configuration of the polymer film or the parameters of the retardation film are adjusted, for obliquely incident light, Also can not get the desired characteristics

Method used

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  • Phase contrast film and production method therefor
  • Phase contrast film and production method therefor
  • Phase contrast film and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] Copolymer 1 and polyisocyanate (manufactured by Asahi Kasei Co., Ltd., DURANATE TKA-100) were dissolved in THF at a weight ratio of 100:0.3 to prepare a solution having a concentration of 20% by weight. This solution was formed into a coating film on a substrate using a spin coater and allowed to dry. Use a Glan Taylor prism to convert ultraviolet rays from a high-pressure mercury lamp into polarized light, and irradiate the dried coating film from the normal direction (irradiation dose: 270mJ / cm 2 ). The film irradiated with polarized light was placed in a thermostat set at 135° C., heated, cooled to 100° C. over 8 minutes, and then taken out from the thermostat. Next, the coating film was irradiated with ultraviolet light from a high-pressure mercury lamp (irradiation dose: 800 mJ / cm2) without polarized light conversion. 2 ).

[0155] The optically anisotropic layer of the obtained retardation film and the adhesive agent of the glass substrate provided with an adhe...

Embodiment 2

[0158] The surface of the TAC substrate was surface-treated using a primer comprising polyisocyanate (manufactured by Tosoh Corporation, CORONET L-55E) and an acrylic binder. Except having used the surface-treated base material, it carried out similarly to Example 1, and formed the optically anisotropic layer on a base material, and produced the retardation film.

[0159] The optical properties of the retardation film produced in this way were Re≒235 nm, Nz coefficient≒0.78 (measured values ​​including the base material), and the thickness of the optically anisotropic layer was 3.7 μm.

[0160] The produced retardation film was wound up into a 5 mmφ rod with the optically anisotropic layer on the outside, and it was confirmed that no cracks occurred in the optically anisotropic layer.

Embodiment 3

[0162] Copolymer 1 and polyethylene glycol 2000 (manufactured by Nacalai Tesque Co., Ltd., average molecular weight 1850 to 2150) were dissolved in THF at a weight ratio of 90:10 to prepare a solution having a concentration of 20% by weight. This solution was formed into a coating film on a substrate using a spin coater and allowed to dry. Use a Glan Taylor prism to convert ultraviolet rays from a high-pressure mercury lamp into polarized light, and irradiate the dried coating film from the normal direction (irradiation dose: 270mJ / cm 2 ). The film irradiated with polarized light was placed in a thermostat set to 135° C., heated, cooled to 100° C. over 8 minutes, and then taken out from the thermostat. Next, the coating film was irradiated with ultraviolet light from a high-pressure mercury lamp (irradiation dose: 800 mJ / cm2) without polarized light conversion. 2 ).

[0163] The optically anisotropic layer of the obtained retardation film and the adhesive agent of the glass...

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Abstract

Provided are a production method for a phase contrast film and the phase contrast film wherein the refractive index in the film thickness direction is controlled, the occurrence of cracks is suppressed, and whereof the capacity to be processed is excellent. This phase contrast film is composed of an optically anisotropic layer containing: a liquid-crystal polymer having a photosensitive group, a sidechain structure capable of forming a liquid crystal structure, and as necessary a further sidechain structure having a cross-linking functional group; and a cross-linking compound and / or a flexiblecompound. For instance, the cross-linking compound may be a polyisocyanate-based compound, and the flexible compound may be polyalkylene glycol.

Description

[0001] related application [0002] This application claims the priority of Japanese Patent Application No. 2018-146198 filed on August 2, 2018, the entire content of which is incorporated by reference as a part of this application. technical field [0003] The present invention relates to a retardation film having good processability and a method for producing the same. Background technique [0004] The retardation film is a film that transmits linearly polarized light components vibrating in mutually perpendicular principal axis directions, imparts a desired phase difference between the two components, and imparts birefringence. Such a retardation film is used to expand the viewing angle of various liquid crystal display devices such as OA equipment such as computers and facsimiles, mobile phones or electronic notebooks, and liquid crystal televisions or cameras, or to impart anti-glare properties, or to improve contrast or brightness. Indispensable optical components. ...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08F20/30C08G18/62C08L33/14C08L71/02
CPCG02B5/30C08G18/62C08L71/02C08F20/30C08L33/14
Inventor 酒井丈也
Owner HAYASHI TELEMPU CO LTD
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