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Process for producing cellulose acylate film

Through the co-casting method and hierarchical structure design, the use of chlorine-free ketone and ester solvents and alcohols, combined with strippers, solves the problems of solvent limitation and low yield in cellulose acylate film preparation, achieving high yield and improved Mechanical strength and flatness for applications such as LCD displays.

Inactive Publication Date: 2007-12-12
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solubility of cellulose acylate in acetone is extremely poor
Although cellulose acetate with a degree of substitution of 2.70 (acetic acid content: 58.8%) or less is slightly soluble in acetone, its solubility in acetone is further reduced if the degree of substitution is higher than 2.70

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] (1-1) Preparation of cellulose acylate solution

[0105] Cellulose acylate solutions were prepared according to the following two methods. The components of the solutions prepared in each Example or Comparative Example are shown in Table 1. Based on the amount of cellulose acylate, silicon dioxide particles (particle size: 20nm), triphenyl phosphate / linked Phenyl diphenyl phosphate (1 / 2) and 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert-butylanilino)-1,3,5- Triazines. In addition, monoethyl citrate was added as a release agent in an amount of 200 ppm based on the amount of cellulose acylate. The inner and outer layers were formed from prepared cellulose acylate solutions of different concentrations. Conditions are detailed in Table 1.

[0106] (1-1a) Cooling and dissolving method (indicated by "cooling" in Table 1)

[0107] Each of the cellulose acylates shown in Table 1 was gradually added to the solvent while stirring. The mixture was left at room temperature (...

Embodiment 2

[0140] (1) Preparation of cellulose acylate solution

[0141] Cellulose propionate (the degrees of substitution of acetyl and propionyl groups were 2.6 and 0.3, respectively; the average degree of polymerization was 670) was used as the cellulose acylate.

[0142] The solvent of the inner coating is composed of methyl acetate, cyclohexanone and butanol with contents of 55wt.%, 20wt.% and 25wt.%, respectively. The outer layer solvent is composed of methyl acetate, cyclohexanone and butanol with contents of 70wt.%, 15wt.% and 15wt.%. Each solvent is free of non-chlorinated solvents. Butanol was added to each solvent 30 minutes before casting.

[0143] To the mixture of methyl acetate and cyclohexanone, cellulose acylate was gradually added while stirring well. The mixture was then left at room temperature (25°C) for 3 hours to allow it to swell. With gentle stirring, the swollen mixture was cooled at a rate of -8°C / min to -30°C and then further cooled to -70°C. After mainta...

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Abstract

A cellulose acylate film is produced by using a cellulose acylate solution and forming a film consisting of two or more layers by the co-casting method. The cellulose acylate to be used is selected so that the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the outer layer becomes smaller than the association molecular weight of cellulose acylate due to the static light scattering in the solution forming the inner layer.

Description

technical field [0001] The present invention relates to a method for preparing cellulose acylate film. Background technique [0002] Cellulose acylate films are used in various photographic or optical elements because they are tough and have sufficient flame retardancy. In fact, cellulose acylate film is a representative photographic support. Because of its optical isotropy, cellulose acylate films are also used in liquid crystal display devices, which have recently been greatly developed in the market. Typically, cellulose acylate films are used as protective films for polarizing plates or color filters in liquid crystal display devices. [0003] Cellulose acylate films are generally produced according to a solvent casting method or a melt casting method. The solvent casting method includes the steps of casting a solution of cellulose acylate in a solvent (dope) on a metal support, and then evaporating the solvent to form a thin film. The melt casting method includes th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B23/20B29C41/12B29C41/22G02B5/30C08L1/12B29C41/28B32B17/10B32B23/00B32B27/00C08J5/00C08J7/043C08J7/044G03C1/795
CPCB32B23/00B32B17/10018C08J5/00C08J7/047B29C41/28G03C1/795C08J2301/12B32B27/00B29C41/26C08J2401/00B32B17/08C08J7/0427C08J7/043C08J7/044B32B23/20B32B2317/18B32B2551/00B32B23/04
Owner FUJIFILM CORP
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