Solvent casting device and solvent casting method

A solution and equipment technology, applied in the field of solution casting equipment, can solve problems such as reducing productivity, and achieve the effects of reducing the generation of skinning, preventing skinning, preventing peeling defects and the dispersion of the solution

Active Publication Date: 2008-09-17
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the productivity is reduced in the casting process

Method used

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  • Solvent casting device and solvent casting method
  • Solvent casting device and solvent casting method
  • Solvent casting device and solvent casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0186] In Example 1, Experiments 1-16 were performed. Experiments 5, 8, 9, 13, 14 are comparisons of the invention and the others are embodiments of the invention. The description of Experiment 1 will be carried out in detail, and the description of the same case will be omitted in the description of Examples 2-16.

[0187] [Experiment 1]

[0188] Now proceed to the description of Experiment 1. The composition used to prepare the coating for film production was as follows:

[0189]

[0190] Cellulose triacetate 89.3% by weight

[0191] (degree of substitution, 2.8)

[0192] Plasticizer A (triphenyl phosphate) 7.1% by weight

[0193] Plasticizer B (biphenyl diphenyl phosphate) 3.6% by weight

[0194]

[0195] Dichloromethane (first solvent component) 87% by weight

[0196] Methanol (second solvent component) 12% by weight

[0197] n-Butanol (third solvent component) 1% by weight

[0198] The solvent used for the coating contains the first solvent component and the ...

Embodiment 2

[0280] [Experiment 1]

[0281] The cellulose triacetate used in Example 10 was synthesized from cellulose obtained from wood, and the Ca content in the cellulose was 5 ppm. Furthermore, as UV absorber A, 2-(3-tert-butyl-5-methyl-2-hydroxyphenyl)-5-chlorobenzotriazole was used. Other conditions are the same as Experiment 1 of Example 1.

[0282] [Experiment 2-16]

[0283] UV Absorber A is the same as in Experiment 1 of Example 2. Other conditions of Examples 2-16 were the same as in Experiments 2-16 of Example 1, respectively.

Embodiment 3

[0285] In Example 3, methanol was used instead of n-butanol used to prepare mixed solvents A-E. Other conditions were the same as in Examples 1 and 2 to conduct experiments 1-16 in Example 3.

[0286] Furthermore, in Examples 2 and 3, in a similar manner to Example 1, evaluations were performed in terms of skinning generation and film smoothness. The evaluation results of Experiments 1-16 of each of Examples 2 and 3 were the same as in Experiments 1-16 of Example 1, respectively.

[0287]Even after continuous and long-term driving, the solution casting method and solution casting apparatus of the present invention can reduce the occurrence of skinning. Therefore, a film can be produced efficiently without cleaning several parts and devices in the casting chamber 62 such as a casting die, a casting drum, and the like.

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Abstract

A casting mould comprises a lip plate and an inner frame plate including contact faces respectively. The contact faces form an outlet of the casting mould. Distance between a ridge of the lip plate and a ridge of the inner frame plate is 9 mum at most. In addition, a nozzle is arranged to be close to the outlet. Casting coating is discharged from the outlet to a carrier in order to form a casting channel between the outlet and periphery of the carrier. The nozzle supplies solution to side of the casting channel.

Description

technical field [0001] The invention relates to a solution casting equipment and a solution casting method. Background technique [0002] Polymer films (hereinafter, films) are used as optical functional films in several fields because they are excellent in optical transparency and flexibility, and are smaller in weight and thickness. Among polymer films, there is a cellulose acylate film formed from cellulose acylate. For example, especially cellulose triacetate (hereinafter referred to as TAC) film is formed from TAC whose average degree of acetylation is in the range of 57.5% to 62.5%. TAC films are used as film substrates for film materials such as photosensitive materials because of their strength and inflammability. In addition, TAC film is excellent in optical isotropy, so it is used as an optical functional film in liquid crystal displays and the like whose market has become larger in recent years, such as protective films for polarizing filters, optical compensati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/24B29C41/36B29C41/52B29C41/34C08J3/02C08J5/18C08L1/12B29L7/00
CPCB29C41/26B29K2001/00C08J3/09C08J2301/10
Inventor 阿比留大作武田亮
Owner FUJIFILM CORP
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