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Alkali saponification method for cellulose acylate film, a surface saponified cellulose acylate film and an optical film utilizing the same

A cellulose acylate, polymer film technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as reduced operating efficiency and a large amount of waste lye

Active Publication Date: 2006-01-11
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, when the processing volume of the polymer film is large, the alkali solution needs to be replaced frequently, thereby reducing the operating efficiency and producing a large amount of waste alkali solution, and the waste alkali solution treatment brings new problems

Method used

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  • Alkali saponification method for cellulose acylate film, a surface saponified cellulose acylate film and an optical film utilizing the same
  • Alkali saponification method for cellulose acylate film, a surface saponified cellulose acylate film and an optical film utilizing the same
  • Alkali saponification method for cellulose acylate film, a surface saponified cellulose acylate film and an optical film utilizing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0448] (Preparation of cellulose ester film CF-1)

[0449] The following composition is charged into the mixing tank, and the components are dissolved by heating with stirring to obtain a cellulose acetate solution A.

[0450] Composition of cellulose acetate composition A

[0451] Cellulose triacetate (degree of substitution: 2.83, degree of substitution of 6-acyl: 0.93, total substitution of 2,3-position

[0452] Degree: 1.90, viscosity average degree of polymerization: 320, water content: 0.4%, at 6% by weight

[0453] Viscosity in methyl chloride solution: 305mPa·s) 100 parts by weight

[0454] Triphenyl phosphate (plasticizer) 8 parts by weight

[0455] 4 parts by weight of diphenyl diphenyl phosphate (plasticizer)

[0456] Dichloromethane (first solvent) 300 parts by weight

[0457] Methanol (second solvent) 60 parts by weight

[0458] The following composition is loaded, and stirred to disperse, and the components are mixed to prepare a matting agent solutio...

Embodiment 2

[0544] (Preparation of cellulose ester film TF-1)

[0545] The composition in Table 3 below was charged into the mixing tank, and the components were dissolved under stirring to obtain a cellulose acetate solution A.

[0546] table 3

[0547] Composition of cellulose acetate composition A

[0548] Cellulose acetate (degree of substitution: 2.83, degree of acyl substitution at the 6-position: 0.93, acyl substitution at the 3-position

[0549] Degree: 1.90, viscosity average degree of polymerization: 320, water content: 0.4%, at 6% by weight

[0550] Viscosity in methyl chloride solution: 305mPa·s)

[0551] 100.0 parts by weight

[0552] Triphenyl phosphate (plasticizer) 8.0 parts by weight

[0553] Dipentaerythritol hexaacetate (plasticizer) 4.0 parts by weight

[0554] Dichloromethane (first solvent) 402.0 parts by weight

[0555] Methanol (second solvent) 60.0 parts by weight

[0556] ...

Embodiment 3

[0644] (Saponified cellulose triacetate film)

[0645] With the help of hot air at 100°C, the cellulose triacetate film Fujitac TD80UF (manufactured by FujiPhoto Film Co.) was heated to 45°C, and then a bar coater was used at 14cc / m 2 Apply the following alkaline solution (S-2) maintained at 25°C at the same amount, and after 13 seconds, use the bar coater again at a rate of 5cc / m 2 Coat the amount of purified water. In this case, the film has a temperature of 45°C. Then, apply 1000cc / m by means of an extrusion coater 2 The purified water is cleaned with water, and after 5 seconds, 100m / sec of air is blown onto the water-coated surface with the help of an air knife. After the squeeze coater cleaning and air knife squeezing steps were repeated twice, drying was performed in a drying zone at 80° C. for 10 seconds to obtain a saponified film SF-2. As in Example 2, saponify a 2000 square meter film.

[0646] Table 10

[0647] Alkaline solutio...

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Abstract

The invention is to provide an alkali saponification method for uniformly and stably saponifying a cellulose acylate film, to provide a surface saponified cellulose acylate film adapted for an optical compensation sheet for a large-sized liquid crystal display apparatus without a display defect, and to provide a alkali saponified cellulose acylate film adapted for an optical compensation sheet with an appropriate adhesion between a transparent substrate and an orienting film. There is provided an alkali saponification method for cellulose acylate film characterized by alkali saponification of a cellulose acylate film with an alkali solution, particularly an alkali saponification method for achieving selective saponification by coating the alkali solution on one surface only of the film, and a cellulose acylate film processed by such alkali saponification method.

Description

Technical field [0001] The present invention relates to an alkali saponification method of a cellulose acylate film, a surface saponified cellulose acylate film and an optical film using the saponified film. Specifically, the present invention relates to an optical film used for light polarization, light scattering, optical compensation, etc. of image display devices. [0002] The present invention also relates to a method for providing supplementary liquid in the production of alkali saponified polymer film. More specifically, the present invention relates to a method of replenishing an alkali solution with a replenishing liquid, so that the alkali solution can be used in a continuous manner to stably produce an alkali saponified polymer film by saponifying the surface of the polymer film. Background technique [0003] In various displays equipped in personal computers, televisions, mobile phones, or various devices, visual information, such as characters o...

Claims

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Application Information

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IPC IPC(8): C08J7/00G02B5/30G02F1/13363
Inventor 川崎博史加藤荣一本隆裕并河均
Owner FUJIFILM CORP
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