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Polymer purification method and equipment, solution membrane production method and equipment, and flocculent and granular polymer precipitation

A polymer solution and purification method technology, applied in the field of flocculent and granular precipitated polymers, to achieve the effects of continuous polymer purification, excellent utilization efficiency, and high-efficiency manufacturing

Active Publication Date: 2017-10-03
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stock solution in this replacement is a mixture of old and new stock solutions, and cannot be used as a product and is discarded.

Method used

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  • Polymer purification method and equipment, solution membrane production method and equipment, and flocculent and granular polymer precipitation
  • Polymer purification method and equipment, solution membrane production method and equipment, and flocculent and granular polymer precipitation
  • Polymer purification method and equipment, solution membrane production method and equipment, and flocculent and granular polymer precipitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0244] Table 1 below shows the results of comparing precipitated CA (Example 1) purified by the method of the present invention with conventionally used raw material CA (Comparative Example 1). In Example 1, the solubility limit (solid content concentration) when cellulose acylate was dissolved in a mixed solvent of dichloromethane and methanol (methanol) was investigated, and about 17% was the limit in Comparative Example 1, and it was about 17% in Example 1. 24%, thus judging that the solubility limit was increased. In addition, as an essential process, the step of heating and concentrating was necessary in Comparative Example 1, but this step was not required in Example 1, and it could be achieved only by dissolution using a dissolution tank. In the subsequent casting step, both Example 1 and Comparative Example 1 were cast at a solid content concentration of about 20%.

[0245] [Table 1]

[0246]

Embodiment 2

[0248] by image 3 The equipment shown above casts the casting stock solution of Example 1 and the casting stock solution of Comparative Example 1 (both with a solid content concentration of about 20%) to obtain a film. Regarding the film obtained from the casting stock solution of Example 1 (Example 2), the film obtained from the casting stock solution of Comparative Example 1 without filtrate (Comparative Example 2), and the film of Comparative Example 1 For each size of the foreign matter, 1 square millimeter (mm) (mm 2 ) in the number of foreign objects.

[0249] When investigating the respective numbers per unit area of ​​small-sized foreign matter of less than 10 μm, medium-sized foreign matter of 10 μm or more and less than 30 μm, and large-sized foreign matter of 30 μm or more, in the unfiltered stock solution of Comparative Example 2, the raw material The foreign matter contained in CA appeared directly in the product, about 5 small-sized foreign matter, about 30 me...

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Abstract

The invention relates to a polymer purification method and equipment, a solution film-making method and equipment, and a flocculent and granular precipitated polymer. In the dissolution box, raw material cellulose acylate (raw material CA) was dissolved in methylene chloride to prepare a thin stock solution having a polymer concentration of 7% by mass. Filter the thin stock solution through a filter. Hot water heated and kept above the boiling point of dichloromethane was put into the precipitator. Sprinkle the dilute stock solution from the first nozzle toward the hot water surface in the precipitator. Dichloromethane in the dilute stock solution in contact with hot water evaporates, and cellulose acylate is precipitated. This precipitated cellulose acylate (precipitated CA) was taken out from the water surface, and the contained hot water was squeezed. Thereafter, the precipitated cellulose acylate was dried with a vibration dryer. Since the precipitated cellulose acylate is obtained from the dilute stock solution once dissolved in the solvent, the precipitated cellulose acylate excellent in solubility by the solvent can be obtained.

Description

technical field [0001] The invention relates to a polymer purification method and equipment, a solution film forming method and equipment, and flocculating and granular precipitated polymers. Background technique [0002] A light-transmitting thermoplastic film is used in various fields as an optical film because it is light in weight and easy to shape. Among them, cellulose acylate-based films such as cellulose acylate (cellulose acylate) are used, represented by photographic photosensitive films, and are used in optical films (such as phase films) as components of liquid crystal display devices that are expanding in market in recent years. poor film or polarizer protective film, etc.). [0003] The membrane is produced by a solution membrane method. In the solution film forming method, a polymer solution (flow casting dope) containing a polymer and a solvent is made to flow on a support to form a cast film. Next, after the cast film is conveyable, the cast film is peele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B3/22C08J5/18
CPCB29C41/28B29D7/01C07C37/84C08B3/16
Inventor 横山和正鹫谷公人下田泰久笠原诚治
Owner FUJIFILM CORP
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