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Manufacturing method of optical film, optical film, and image display device

A manufacturing method and optical film technology, which can be applied in the bonding method of surface pretreatment, the device for coating liquid on the surface, optical components, etc., and can solve problems such as appearance defects and residues

Active Publication Date: 2018-02-16
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 the surface of the polarizer-transparent protective film, etc., before coating the adhesive composition, etc., foreign matter such as sundries or dust adheres, or the adhesive composition contains minute foreign matter, the foreign matter will Remains on the adhesive layer, as a result, appearance defects may occur

Method used

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  • Manufacturing method of optical film, optical film, and image display device
  • Manufacturing method of optical film, optical film, and image display device
  • Manufacturing method of optical film, optical film, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] exist figure 1 , 2 In the production line shown, a gravure roll coating method 10A (MCD coater (manufactured by Fuji Machinery Co., Ltd.)) (unit shape: honeycomb grid pattern, number of lines per gravure roll: 1000 lines / inch, Rotation speed ratio 140%), the liquid is applied to the two surfaces of the bonding surface of the first film 1 and the bonding surface of the second film 2, thereby removing the bonding of the two films that are bonded. Foreign matter and air bubbles on the surface. Then, using the gravure roll coating method 10B, the adhesive composition 3 is coated on the bonding surface of the second film 2, thereby manufacturing a polarizing film while removing foreign matter and air bubbles. Contains PET base material and the second film 2 of the thin polarizer, the adhesive composition 3 was applied so that the surface of the thin polarizer was the bonding surface. Furthermore, the adhesive composition 3 was applied so that the thickness of the adhesive l...

Embodiment 2～9、 comparative example 1～2

[0119] In addition to changing whether or not to apply the adhesive composition to the first film and / or the second film, the type of post-measurement coating method, the viscosity and composition of the liquid to the contents described in Table 1, the same method as in Example 1 was used. Optical films were produced in the same way. Commercially available coating devices were used in the bar coater coating system and the air knife coating system, respectively.

[0120]

[0121] The number of appearance defects in the adhesive layer of the polarizing film (the number of appearance defects due to foreign matter and from (bonded) air bubbles (number / m 2 )). The results are shown in Table 1.

[0122] [Table 1]

[0123]

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PUM

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Abstract

An optical film production method that has a first application step wherein foreign matter is removed by using a post-measurement application procedure to apply a liquid that has a viscosity of 1-10000 cP to a bonding surface of a first film and to a bonding surface of a second film. The production method preferably has a second application step wherein, if the liquid is applied to the bonding surface of only one of the films, or if the liquid is applied to the bonding surface of both films, a post-measurement application procedure is used to apply an adhesive composition or a pressure-sensitive adhesive composition to the bonding surface of the film to which the liquid is not applied or to the bonding surface of at least one of the films.

Description

technical field [0001] The present invention relates to an optical film comprising a laminated structure in which at least a first film and a second film are laminated via an adhesive layer or an adhesive layer, and a method for producing the same. It consists of an adhesive composition or a cured product layer of an adhesive composition. Furthermore, the present invention relates to image display devices such as liquid crystal display devices, organic EL display devices, and PDPs using the optical film. Background technique [0002] Liquid crystal display devices are rapidly expanding the market for watches, mobile phones, PDAs, notebook personal computers, monitors for personal computers, DVD players, TVs, and the like. A liquid crystal display device is a device for visualizing a polarization state by switching operations of liquid crystals, and a polarizing plate is used based on the display principle. In particular, in applications such as TVs, high brightness, high c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J5/02B05D3/00B05D7/04B29C65/48G02B5/30B29L7/00B29L11/00
CPCB05D3/00B05D7/04B29C65/48C09J5/02G02B5/30
Inventor 品川雅井上龙一
Owner NITTO DENKO CORP