Acylation cellophane and producing method thereof

A cellulose acylate and film technology, applied in the field of cellulose acylate film and its preparation, can solve the problems of low film quality and achieve the effect of excellent adhesion performance and optical performance

Inactive Publication Date: 2004-09-08
FUJIFILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the quality of the prepared film becomes lower

Method used

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  • Acylation cellophane and producing method thereof
  • Acylation cellophane and producing method thereof
  • Acylation cellophane and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] In Example 1, a cellulose acetate film 10 having a three-layer structure was prepared, and the adhesion property with polyvinyl alcohol was evaluated. The thin film 10 was formed in the feed sleeve type co-casting method so that the thickness of the first outer layer 11 was 18 μm, the thickness of the inner layer 12 was 4 μm, the thickness of the second outer layer 13 was 18 μm, and the total thickness T10 was 40 μm . A tape 38 is used as a substrate. The cellulose acetate of the outer layers 11 , 13 is made of wood pulp and has an average degree of acetylation of 2.8, and the cellulose acetate of the inner layer 12 is made of wood pulp and has an average degree of acetylation of 1.8. The outer and inner layers 11-13 are formed from paints 22-24. Mixed solvents for Coatings 22-24 were prepared by mixing dichloromethane, methanol, and n-butanol at a volume ratio of 85:12:3. The solid substances (including additives) added to the mixed solvent and their contents are sh...

Embodiment 2

[0093] In Example 2, the preparation Figure 4 A cellulose acetate film 50 having a 5-layer structure was used, and the adhesion performance with polyvinyl alcohol was evaluated. The thickness of the outer layers 51 , 55 of the film 50 is 3 μm, the thickness of the first and third inner layers 52 , 54 is 15 μm, and the thickness of the second inner layer 53 is 4 μm. The cellulose acetate of the first-third inner layers 52-54 and the second outer layer 55 are made of wood pulp, and only the cellulose acetate of the first outer layer 51 is made of cotton linter. The degree of acetylation of the outer layers 51, 55 was 1.8, the degree of acetylation of the first and third inner layers 52, 54 was 2.8, and the degree of acetylation of the second inner layer 53 was 2.75. The mixing ratios of solid matter and additives added to the paint for each layer were as follows. The cellulose acylate film was adhered to polyvinyl alcohol under the condition that the surface of the first oute...

Embodiment 3

[0129] In Example 3, a polyvinyl alcohol film (manufactured by Kuraray Co. Ltd) having a thickness of 75 μm was dipped in an aqueous solution at 25° C. with an iodine content of 0.3 g / liter and a potassium iodide content of 18.0 g / liter. Then, the film was stretched in an aqueous solution at 50°C in which the content of boric acid was 80 g / liter and the content of potassium iodide was 30 g / liter. Therefore, the film becomes 5 times larger and becomes a polarizing film. The cellulose acetate film obtained in Example 2 was adhered to the polarizing film with an adhesive, and then, they were dried for 30 minutes in a constant temperature room where the air temperature was kept at 80°C. Note that the binder is a 4% aqueous solution of polyvinyl alcohol (trade name: PVA-117H, manufactured by Kuraray Co. Ltd).

[0130] According to the obtained polarizing filter, use a spectrophotometer to obtain the parallel light transmittance Yp and cross light transmittance Yc in the visible ra...

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Abstract

In a multi-layer structure of a cellulose acylate film, the averaged degree of acylation of surface layers is controlled in the range of 0.5 to 2.8 by mixing several sorts of cellulose acylates having different averaged degrees of acyation. One of the surface layers is formed on a substrate by casting a solution containing cellulose acylate made of cotton linter. Lubricant particles are added to a solution for the surface layers, and emission compounds to a solution for the inner layers. The obtained cellulose acylate film is excellent in adhesive property to the hydrophobic material without saponification, and adequately used for the polarizing filter, an optical compensation sheet, and liquid crystal display.

Description

technical field [0001] The present invention relates to a cellulose acylate film and a method for producing the same, in particular, to a cellulose acylate used as a protective film of a polarizing film constituting a polarizing filter and used for an optical compensation film, a liquid crystal display, etc. Thin films and methods for their preparation. Background technique [0002] Cellulose acylate films have transparency, suitable water vapor permeability and high mechanical strength. The steric resistance of the cellulose acylate film does not particularly depend on humidity and temperature. Therefore, cellulose acylate films are widely used as substrates for optical materials. For the production method of cellulose acylate film, there is a solution casting method in which a dope prepared from a polymer and a solvent is cast on a substrate by die casting and dried in a drying process to form a film. [0003] Cellulose acylate films are also used as protective films fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C70/36B32B23/00B32B23/04B32B27/40C08L1/02
CPCB32B23/00Y10T428/31982Y10T428/31978Y10T428/31591Y10T428/31975Y10T428/31986Y10T428/31993Y10T428/31971A01G9/081A01G9/083B32B7/04B32B2264/102B32B2457/202B32B23/04
Inventor 杉浦秀
Owner FUJIFILM CORP
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