Method for producing optical film, optical film and image display device

A manufacturing method and technology of optical film, applied in chemical instruments and methods, optics, lamination devices, etc., can solve problems such as residues and appearance defects

Inactive Publication Date: 2015-09-02
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the conventional production method, when foreign substances such as dust and dust adhere to the surface of the polarizer, transparent protective film, etc. before coating the adhesive composition or the like, or the adhesive composition contains minute foreign substances, the foreign substances may remain Adhesive layers, as a result, sometimes produce cosmetic defects

Method used

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  • Method for producing optical film, optical film and image display device
  • Method for producing optical film, optical film and image display device
  • Method for producing optical film, optical film and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] exist figure 1 , 2 In the production line shown, a gravure roll coating method 10 (MCD coater (manufactured by Fuji Machinery Co., Ltd.)) (cell shape: honeycomb pattern, gravure roll unit line number: 1000 lines / inch, rotating speed ratio 140%), the adhesive composition 3 was applied to both the bonding surface of the first film 1 and the bonding surface of the second film 2, whereby a polarizing film was produced while removing foreign substances and air bubbles. For the second film 2 composed of a PET base material and a thin polarizer, the adhesive composition 3 is coated with the thin polarizer surface as the bonding surface. It should be noted that the adhesive composition 3 has the thickness of the adhesive layer after drying Coated on the first film and the second film in a method of 1 μm. As the gravure roll coating method 10, use figure 2 Shown is a gravure roll coating system with a foreign matter removal function (foreign matter removal method using a filt...

Embodiment 2～9、 comparative example 1～6

[0114] In addition to the type of adhesive composition used to bond the first film and the second film, whether the adhesive composition is applied to the first film and / or the second film, the type of post-measurement coating method, and the surface of the gravure roll Except having changed the formation pattern to the description of Table 1, the optical film was manufactured by the method similar to Example 1. In the bar coater coating system and the air knife coating system, a commercially available coating device was used, respectively.

[0115]

[0116] By visual inspection and reflective inspection with an automatic inspection device, the number of appearance defects in the adhesive layer of the polarizing film (the number of appearance defects from foreign matter and from (bonded) air bubbles (pieces / m 2 )). The results are shown in Table 1.

[0117] Table 1

[0118]

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PUM

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Abstract

A method for producing an optical film which comprises a multilayer structure wherein at least a first film and a second film are bonded with each other with an adhesive layer or bonding agent layer being interposed therebetween, said adhesive layer or bonding agent layer being composed of a layer of a cured product of an adhesive composition or bonding agent composition. This method for producing an optical film comprises a coating step wherein foreign materials and/or air bubbles are removed by applying the adhesive composition or bonding agent composition to both the bonding surface of the first film and the bonding surface of the second film using a post-measurement coating method.

Description

technical field [0001] The present invention relates to an optical film and a manufacturing method thereof. The optical film has a laminated structure in which at least a first film and a second film are laminated through an adhesive layer or an adhesive layer. The adhesive layer or adhesive The layer includes an adhesive composition or a cured product layer of the adhesive composition. The present invention further relates to image display devices such as liquid crystal display devices, organic EL display devices, and PDPs using the above optical film. Background technique [0002] In watches, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, TVs, etc., liquid crystal display devices are rapidly expanding the market. A liquid crystal display device is a device for visualizing a polarization state caused by switching of liquid crystals, and a polarizing plate is used based on the display principle. Especially in applications such as TV,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B38/00C09J5/04G02B5/30G02F1/1335
CPCB32B37/1284C09J5/04G02F1/1335B32B37/003G02B5/30B32B2307/40B32B2457/20C09J5/00C09J2203/318G02F2202/28
Inventor 品川雅井上龙一
Owner NITTO DENKO CORP
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