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Solution casting method of film

A solution and casting liquid technology, applied in the field of film manufacturing, can solve the problems of film surface deterioration, difficulty, uneven film thickness, etc., and achieve the effects of helping air flow control, reducing trouble, and preventing unevenness

Active Publication Date: 2008-03-05
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to limitations in increasing decompression levels, the effects of airflow cannot be completely eliminated
Therefore, there is no effective method to prevent the casting bead from being affected by the air flow, and it is very difficult to design a device for preventing uneven film thickness
In addition, as the air flow rate increases, the air flow is more likely to enter between the casting bead and the support, making the film thickness non-uniform and deteriorating the surface of the film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Example 1 is described below. However, the present invention is not limited to Example 1. Note that a detailed explanation is given in Experiment 1. Regarding Experiments 2 to 17 according to the present invention and Comparative Experiment 18, the experimental conditions are shown in Table 1 together with the results.

[0094] The raw material used for each mass part of embodiment 1 is as follows:

[0095] [Element]

[0096] Cellulose triacetate (microparticle, its degree of substitution is 2.84, the viscosity-average degree of polymerization is 306, the moisture content is 0.2% (mass), the viscosity of the dichloromethane solution of 6% (mass) is 315mPa·s, and the average particle diameter is 1.5mm and the average deviation of particle size is 0.5mm)

[0097] 100 parts by mass

[0098] Dichloromethane (first solvent) 384 parts by mass

[0099] Methanol (second solvent) 94 parts by mass

[0100] 1-butanol (the third solvent) 2 parts by mass

[0101] Plasticizer...

Embodiment 2

[0144] Embodiment 2 is described below. However, the present invention is not limited to Example 2. Note that this is described in detail in Trial 19. However, the description of the same test conditions as Test 1 is omitted. Furthermore, with regard to Tests 20 to 27 according to the present invention and Comparative Test 28, the experimental conditions and results are shown together in Table 2 below.

[0145] Each part by mass of raw materials used in Test 19 is shown below.

[0146] [Element]

[0147] Cellulose triacetate (the degree of substitution is 2.83, the viscosity-average degree of polymerization is 320, the moisture content is 0.4% (mass), and the viscosity of a 6% dichloromethane solution with a mass content is 305mPa·s)

[0148] 28 parts by mass

[0149] 75 parts by mass of methyl acetate

[0150] Cyclopentanone 10 parts by mass

[0151] Acetone 5 parts by mass

[0152] Methanol 5 parts by mass

[0153] 5 parts by mass of ethanol

[0154] Plasticizer A ...

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Abstract

Dope including a polymer and a solvent is discharged from a casting die (30) to a casting drum (31) while forming a casting bead (38). An upstream side (38a) area of the casting bead (38) is decompressed by a decompression chamber (36) to (atmospheric pressure - 300) Pa. Air shielding plates (70, 71) are provided inside the decompression chamber (36). Openings (90) are respectively formed in upper half portions of the air shielding plates (70, 71). Adistance L (mm) between a contact position A of the casting bead (38) and the air shielding plate (70) is set in the range of 20 mm to 100 mm. After the casting bead (38) forms a casting film (39) on the casting drum (31) , the casting film (39) is peeled and dried to obtain a TAC film.

Description

technical field [0001] The present invention relates to a method of manufacturing a thin film, and more particularly, the present invention relates to a method of manufacturing a thin film used as a protective film of a polarizing filter and an optical compensation film in an LCD device or a photographic support film. Background technique [0002] Cellulose acylate films, especially triacetate cellulose (TAC) films manufactured from TAC having an average degree of acetylation ranging from 57.5% to 62.5%, are used as photographic supports for photographic photosensitive materials due to their toughness and fire-resistant properties membrane. Further, due to its excellent optical isotropy, the TAC film is used as a protective film of a polarizing filter, an optical compensation film, for example, a wide viewing angle film or the like used in LCD devices currently expanding in the market. [0003] Typically, TAC membranes are fabricated by solution casting. The method of solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/50B29C41/24B29L7/00
CPCB29C47/8865B29K2001/00B29C47/0021B29C41/26B29C48/08B29C48/916B29C41/24B29C41/50B29L2007/00
Inventor 樋口次郎加藤盛孝铃木祐次
Owner FUJIFILM CORP
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