Method of manufacturing coating sheet, coating sheet, polarizing plate, optical element and image display device

A manufacturing method and film coating technology, which are applied to optical elements, polarizing elements, and devices for coating liquid on surfaces, etc., can solve the problems of uneven phase difference and uneven interference of resin layers, and achieve the effect of uniform film thickness.

Inactive Publication Date: 2007-02-07
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the method of using a low-viscosity coating liquid, there is a problem that the substrate coated with the coating liquid is Resin flow occurs locally on the film. If the resin is cured in this state, bright spots will be generated on the coating film surface due to shrinkage cavities, and appearance defects such as interference unevenness and phase difference unevenness will occur due to the thickness difference of the local resin layer. Formation of a coating film without appearance defects on the substrate film

Method used

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  • Method of manufacturing coating sheet, coating sheet, polarizing plate, optical element and image display device
  • Method of manufacturing coating sheet, coating sheet, polarizing plate, optical element and image display device
  • Method of manufacturing coating sheet, coating sheet, polarizing plate, optical element and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] 10% by weight of polyimide (represented by the following formula (30), weight average molecular weight Mw=140000) was dissolved in methyl isobutyl ketone to prepare a polyimide solution with a viscosity of 200 mPa·sec.

[0171] Use the coating mode of die coater, control the travel speed of polyethylene terephthalate film (thickness 75 μ m) to be 20m / min, and the rate of change of its speed of progress is controlled at 2.7%, on above-mentioned sheet material The aforementioned polyimide solution was applied, and after application, it was dried at 120° C. for 3 minutes to obtain a coated film sheet having a film thickness of 6 μm.

[0172] Figure 5 A planar photograph of the coated sheet obtained in Example 1 is shown. in addition, Figure 5 Arrows in indicate the direction of travel of the substrate film.

[0173] like Figure 5 It was shown that in the obtained coated film sheet, no interference unevenness due to thickness unevenness was observed visually.

[017...

Embodiment 2

[0179] Except that the viscosity of the polyimide solution was adjusted to 500 mPa·sec, the rest was the same as in Example 1.

[0180] The obtained coated film sheet and Figure 5 As shown, similarly, interference unevenness due to thickness unevenness was not recognized visually.

Embodiment 3

[0182] Except that the viscosity of the polyimide solution was adjusted to 1000 mPa·sec, the rest was the same as in Example 1.

[0183] The obtained coated film sheet and Figure 5 As shown, similarly, interference unevenness due to thickness unevenness was not recognized visually.

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Abstract

A method for producing a coated sheet which involves an application step of applying a fluid containing a resin material and a solvent on a traveling base film continuously, and a drying step of drying a coating film applied on the base film in the above application step, wherein the above application fluid has a viscosity of 70 to 8,000 mPa sec, and the fluctuation rate for the speed of the traveling of the above base film is controlled to 3.0 % or less. The above method can be suitably employed for forming a coating film being free from the failure in its appearance and having a uniform thickness.

Description

technical field [0001] The present invention relates to a method of manufacturing a coated sheet mainly used in optical elements, image display devices, and the like. Background technique [0002] In the display devices of office automation equipment such as TVs and personal computers, liquid crystal display devices, which have outstanding advantages such as thin walls, light weight, and low power consumption, are used. A current liquid crystal display device includes the following optical functional layers: a liquid crystal layer for forming a retardation film, a hard coat layer for surface protection, a surface treatment coating such as an antireflection film, and the like. The above-mentioned optical function layer is formed in a thin film state with the improvement of optical function, and if the film thickness of the optical function layer is not uniform, the display performance of an image display device (for example, a liquid crystal display device) during use will de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/26G02B1/10B05D5/04G02B5/30B05D7/04B32B27/08G02B1/111G02B1/14
CPCG02B5/30G02B1/10B05D1/26B05D7/04
Inventor 近藤诚司吉田健太郎藤原诚江原正浩
Owner NITTO DENKO CORP
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