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Retardation film and polarizing plate

A technology of retardation film and light, which is applied in optics, optical elements, polarizing elements, etc., can solve problems such as difficulty in obtaining a balance between retardation in the plane direction and retardation in the thickness direction, and achieve reliable adjustment, small retardation change, and reliable retardation.

Inactive Publication Date: 2016-01-20
KEIWA INCORPORATED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a solvent remains in the retardation film described in the publication, and there is a problem that it is difficult to achieve a balance between retardation in the plane direction and retardation in the thickness direction due to the residual solvent.

Method used

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  • Retardation film and polarizing plate
  • Retardation film and polarizing plate
  • Retardation film and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Examples of the retardation film of the present invention will be described below.

[0110]In this example, the following sheet-forming material was prepared by adding 5 wt. TPP of Daihachi Chemical Industry and 5 parts by weight of #10 of Daihachi Chemical Industry. The sheet-forming material was melted and extruded through a T-die to obtain a sheet-shaped sheet-forming material, and the sheet-shaped sheet-forming material was stretched at a stretching temperature of 155° C. at a stretching ratio of 165%. The retardation film of this example was obtained. In addition, the average thickness of the retardation film was 145 μm (240 μm before stretching).

[0111] For the retardation film of the above example, the transmitted light for each wavelength was measured under the environment of 23° C. and 50% RH with an automatic birefringence measuring device (manufactured by Oji Scientific Instruments Co., Ltd., trade name: KOBRA-WR). face direction delay. The results are ...

Embodiment approach

[0117] In addition, this invention is not limited to the said embodiment, Various deformation|transformation and improvement are possible. For example, the polarizing plate 10 of the above-described embodiment has been described as a polarizing plate having a three-layer structure (excluding the adhesive layer 5 ) having a pair of retardation films 1 and a polarizing plate 3 sandwiched therebetween, but for example, it may be suitably Change the design so that the polarizing plate 10 has, for example, a two-layer structure of the polarizer 3 and the retardation film 1. In addition, it can also be adopted on the three-layer structure of the above-mentioned embodiment. Laminated protective film structure.

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Abstract

An object of the present invention is to provide a retardation film and a polarizing plate which can easily and reliably adjust retardation, which can be easily laminated and bonded, and which have little change in retardation due to the conditions of the use environment. The retardation film of the present invention is a retardation film formed by stretching an extruded cellulose acetate propionate resin sheet. When the retardation value measured with 448.1nm light is R448, the retardation value measured with 589nm light is R589, and the retardation value measured with 800nm ​​light is R800, the ( R800 / R589-R448 / R589) / (800-589) is not less than 0.001 and not more than 0.003.

Description

technical field [0001] The present invention relates to a retardation film and a polarizing plate. Background technique [0002] Conventionally, there is known a retardation film formed by stretching a polycarbonate sheet or a cycloolefin polymer sheet. The retardation film is used, for example, in a polarizing plate. Specifically, a polarizer is formed by laminating a polarizer protective film made of cellulose triacetate or the like on both surfaces of a polarizer (polarizer), and the retardation film is formed by applying a water-based glue (water paste) or the like to the polarizer. The polarizer is laminated and glued on the polarizer to manufacture a polarizer. [0003] The resin of the polycarbonate retardation film has a relatively high photoelastic coefficient of 60 to 80. If the polycarbonate retardation film is deformed by the temperature and humidity of the use environment, the refractive index will change and retardation will occur. changing issues. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCC08J5/18B29D7/01B32B27/08G02F1/13363G02B5/3033C08L1/12C08L2203/16C08J2301/12B29C48/0018
Inventor 峯尾裕
Owner KEIWA INCORPORATED
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