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Retardation film

A technology of retardation film and resin layer, applied in polarizing elements, chemical instruments and methods, layered products, etc., can solve problems such as the decrease of brightness of display devices

Active Publication Date: 2019-05-10
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this retardation film is used in a display device, the brightness of the display device may be reduced

Method used

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  • Retardation film
  • Retardation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0150] [Rubber Elastomer Particles]

[0151] The rubber elastomer particles use the innermost layer to be composed of a hard polymer polymerized by methyl methacrylate and a small amount of allyl methacrylate, and the middle layer is composed of butyl acrylate, styrene and a small amount of methyl methacrylate as the main components. A three-layer rubber elastomer particle A composed of a soft rubber elastomer polymerized from allyl acrylate and a hard polymer polymerized from methyl methacrylate and a small amount of ethyl acrylate as the outermost layer . The number average particle diameter of the rubber elastic body particle A up to the rubber elastic body as the middle layer was 240 nm, and the total mass of the innermost layer and the middle layer was 70% of the whole particle.

[0152] [Resin composition (a) for forming resin layer (a)]

[0153] A resin composition (a) was obtained by mixing methyl methacrylate resin ("SUMIPEX (registered trademark) MH") manufactured ...

Embodiment 5

[0160] The retardation film A was obtained by laterally stretching the film A using a tenter. Specifically, after the film A was preheated, it was stretched between chucks at a ratio of 2.8 times that of the film in the unstretched state, and then heat-treated on the film after the transverse stretching. heat-fixing treatment. Table 2 shows the temperature conditions of each step.

Embodiment 6～8、 comparative example 3、4

[0162] Retardation films B to F were obtained in the same manner as in Example 5, except that film A was made into films B to F, and the temperature conditions of each process were the temperatures shown in Table 2.

[0163] 【Table 2】

[0164]

[0165] The following physical properties were measured about retardation films A-F. The results are shown in Table 3.

[0166] [Total light transmittance]

[0167] The transmittance was measured using "HAZEMETER HM-150" with light source D65 and optical conditions JIS K 7361.

[0168] [In-plane phase difference Re(590)]

[0169] The in-plane retardation value Re(590) at a wavelength of 590 nm was measured using a retardation measuring device "KOBRA-WR" manufactured by Oji Scientific Instruments.

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Abstract

The invention provides a retardation film that prevents the brightness of a display device from decreasing. The retardation film includes a resin layer (a) with a refractive index of 1.50 or less and a total light transmittance of 80% or more, and a resin layer (b) with a refractive index of 1.55 or more, an intrinsic birefringence of 0.07 or more, and a total light transmittance of 80% or more, the resin layer (a) and the resin layer (b) are stacked on one another. At least one resin layer (a) is positioned outside the resin layer (b).

Description

technical field [0001] The present invention relates to retardation films. Background technique [0002] Patent Document 1 describes a retardation film made of polycarbonate. When this retardation film is used for a display device, the brightness of the display device may be lowered. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Application Laid-Open No. 3-174512 Contents of the invention [0006] The problem to be solved by the invention [0007] The intrinsic birefringence of polycarbonate is 0.07 or more, so it is easy to express a phase difference, but the refractive index is as high as 1.55 or more, so there is a problem of reducing the brightness of a display device when used as a phase difference film. [0008] means of solving problems [0009] The present invention includes the following inventions. [0010] [1] A retardation film in which: a resin layer (a) having a refractive index of 1.50 or less and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B27/06B32B7/12
Inventor 本庄义人
Owner SUMITOMO CHEM CO LTD