Shape-forming film, and optical laminate provided with shape-forming film

A technology of optical laminates and films, applied in optics, optical elements, filters, etc., to achieve the effect of excellent brightness, brightness field of view, and excellent processability

Pending Publication Date: 2022-06-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a light-diffusing film, brightness, luminance viewing angle, processability, and durability (especially humidity durability) of an optical laminate including the light-diffusing film are sometimes required. , it is difficult to satisfy these properties in a well-balanced

Method used

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  • Shape-forming film, and optical laminate provided with shape-forming film
  • Shape-forming film, and optical laminate provided with shape-forming film
  • Shape-forming film, and optical laminate provided with shape-forming film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] A methacrylic resin (manufactured by Kuraray Co., Ltd., product name "PARAPET HR-S") was put into a single-screw extruder and melt-extruded at 260°C while giving a concavo-convex shape to one surface with an embossing roll, A shaped film was obtained (thickness: 50 μm, convex height: 10 μm, cell size: 15000 μm 2 ).

[0124] The obtained shaped film was used for the above-mentioned evaluations (1) to (7). The results are shown in Table 1.

Embodiment 2

[0126] A shaped film (thickness: 46 μm, protrusion height: 5 μm, cell size: 5000 μm) was obtained in the same manner as in Example 1 except that the embossing roll was changed. 2 ).

[0127] The obtained shaped film was used for the above-mentioned evaluations (1) to (7). The results are shown in Table 1.

Embodiment 3

[0129]A methacrylic resin (manufactured by Kuraray Co., Ltd., product name "PARAPET HR-S") was put into a single-screw extruder, and melt-extruded at 260° C. to obtain a substantially flat film with a thickness of 55 μm. A photopolymerization initiator (manufactured by Ciba Specialty Chemicals, trade name) was added to 95 parts by weight of urethane acrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "NK Oligo U-108A") on the surface of the film. "IRGACURE 184") 5 parts by weight of UV-curable resin, after transferring the concavo-convex shape to the coating surface, UV-curing the resin to obtain a shaped film (thickness: 55 μm, convex height: 5 μm, cell size: 10000 μm 2 ).

[0130] The obtained shaped film was used for the above-mentioned evaluations (1) to (7). The results are shown in Table 1.

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Abstract

Provided is a shaped film which can exhibit excellent brightness and brightness angle when used in combination with another film to constitute an optical laminate, can contribute to the durability (particularly, humidification durability) of the optical laminate, and has excellent processability. A shaped film according to the present invention is provided with a base part and a concavo-convex part formed on one surface of the base part, the concavo-convex part having convex parts and concave parts, the concave parts having a cell structure surrounded by the convex parts, the height of the convex parts being 5-40% of the thickness of the shaped film, and the height of the concave parts being 5-40% of the thickness of the shaped film. The average area of the recesses having the cell structure is 5000 [mu] m2 or more, and the wall surfaces of the protrusions are present in a region within 500 [mu] m from the edge of the shaped film.

Description

technical field [0001] The present invention relates to a shaped film and an optical laminate including the shaped film. Background technique [0002] In recent years, there has been a strong demand for reduction in thickness and improvement in design (for example, narrowing of the frame) of image display devices (eg, liquid crystal display devices and organic EL display devices). Along with this, expectations for integration and / or functional integration of optical members and / or optical films for image display devices are also increasing. As an example of such integration or integration of functions, there has been proposed a method in which a light-diffusing film is directly bonded to a predetermined optical member or the like to give a light-diffusing function. A light-diffusing film is sometimes required to have brightness, a viewing angle of brightness, processability, and durability (particularly, humidity durability) of an optical laminate including the light-diffus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/02
CPCG02B5/0215G02B5/30B32B7/022B32B3/30G02B5/02G02B5/20B32B7/023
Inventor 吉川贵博三田聪司池田哲朗
Owner NITTO DENKO CORP
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