Method and device for forming cast film, and solution film forming method

A technology of casting film and dope, applied in the field of solution film making, can solve the problem of uneven optical properties

Inactive Publication Date: 2016-05-25
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, although it is possible to improve the production efficiency of the film by using the method of Japanese Patent Laid-Open No. 2006-306059, the optical characteristics (in-plane retardation Re or thickness direction retardation Rth, etc.) unevenness becomes a problem

Method used

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  • Method and device for forming cast film, and solution film forming method
  • Method and device for forming cast film, and solution film forming method
  • Method and device for forming cast film, and solution film forming method

Examples

Experimental program
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Embodiment

[0238] (Experiments 1~8)

[0239] Experiments 1 to 8 were carried out according to the following method. Regarding the details of each experiment, Experiment 1 will be described in detail, and the description of the same parts as Experiment 1 will be omitted for Experiments 2 to 8, and the different parts will be described.

[0240] (Experiment 1)

[0241] The formulations of the compounds used to prepare the dope 24 are shown below.

[0242] The solid content will be constituted according to the following composition ratio, namely

[0243] 100 parts by mass of cellulose triacetate (degree of substitution 2.86),

[0244] 10 parts by mass of triphenyl phosphate (TPP),

[0245] 0.03 parts by mass of delustering agent (AEROSILR972)

[0246] Appropriately added to a mixed solvent composed of the following, and stirred and dissolved to prepare a dope 24, that is,

[0247] 80 parts by mass of dichloromethane,

[0248] 13.5 parts by mass of methanol,

[0249] 6.5 parts by mas...

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PUM

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Abstract

The invention provides a casting film forming method and device and a solution film forming method. In the cast film forming step, the dope flowing down step, the casting step, the film heating step, the surface layer forming step, the film drying step, the film cooling step, the peeling step, and the support heating step are repeated sequentially. In the dope flowing down step, the dope is made to flow down the endless belt. In the casting process, a cast film is formed from the dope. In the film heating step, the surface of the film is smoothed by heating the cast film. In the surface layer forming step, a surface layer is formed on the film surface. In the film drying step, the cast film is dried. In the film cooling step, the cast film is cooled to a state where it can be transported independently. In the peeling step, the cast film is peeled from the endless belt. In the support body heating step, the endless belt that has passed through the peeling step is heated.

Description

technical field [0001] The invention relates to a casting film forming method and device and a solution film forming method. Background technique [0002] A polymer film (hereinafter referred to as a film) is widely used as an optical film because of its excellent translucency, flexibility, and light-weight thin film. Among them, cellulose ester-based films using cellulose acylate and the like are used in optical films. The optical film is typified by a photosensitive film, and there are a protective film for a polarizing plate, a retardation film, and the like. A protective film or retardation film for a polarizing plate is a component of a liquid crystal display device whose market has been expanding in recent years. [0003] As a method for producing a membrane, there is a solution membrane-forming method. The solution film forming method has a cast film forming step, a film independent step, a peeling step, and a wet film drying step. In the cast film forming step, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18
CPCB29C41/28B29D7/01C08J5/18C08L2203/16
Inventor 新井利直
Owner FUJIFILM CORP
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