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Filter, filtering method, acylate cellulose film and making method thereof

A cellulose acylate and filter technology, which is applied in the field of filters, can solve the problems of costly, difficult removal of unreacted cellulose, etc., and achieve the effect of suppressing bright spots and suppressing the rise of filter pressure

Active Publication Date: 2014-10-29
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the filter of Patent Document 1 has a problem that it is difficult to efficiently remove unreacted cellulose
In addition, if a metal filter is used instead of the filter of Patent Document 1 in order to remove unreacted cellulose, the filtration pressure (filtration pressure) will gradually rise from the start of filtration, and must be stopped when the filtration pressure reaches a certain value or more. Filtration and frequent replacement of metal filters
Therefore, there is a problem of cost

Method used

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  • Filter, filtering method, acylate cellulose film and making method thereof
  • Filter, filtering method, acylate cellulose film and making method thereof
  • Filter, filtering method, acylate cellulose film and making method thereof

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Embodiment Construction

[0091] The filter, the filtration method, the cellulose acylate film with few bright spots and foreign substances of the present invention, and the method for producing the same will be described while showing embodiments. In addition, the form shown here is an example of this invention, and does not limit this invention.

[0092] Such as figure 1 As shown, the dope manufacturing facility 10 has a solvent tank 11 , an additive tank 12 , a hopper (hopper) 13 , and a mixing tank 15 . In the solvent tank 11, the solvent used as the raw material of the dope is stored, and in the additive tank 12, an additive solution obtained by mixing an additive and a solvent in advance is stored. In addition, cellulose acylate is supplied to the hopper 13 . The solvent tank 11 , the additive tank 12 and the hopper 13 are all connected to the mixing tank 15 , and have a structure in which appropriate amounts of various dope raw materials are fed into the mixing tank 15 appropriately. The supp...

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Abstract

The invention aims to provide a filter, a filtering method, an acylate cellulose film and a making method thereof capable of highly efficiently removing unreacted cellulose, being insoluble foreign matter, from a dope; the acylate cellulose film has less bright spot foreign metters; a surface of a fiber body (65) forming the filter filtering the dope is provided with a cationic polymer layer (66) containing cationic polymers (67); therefore, a surface of the filter carries positive electricity; the unreacted cellulose being insoluble foreign matter with negative electricity in the dope can be fixed on the surface of the filter (62) with the positive electricity, and thus being removed from the dope.

Description

technical field [0001] The present invention relates to a filter, a filtering method, a cellulose acylate film and a manufacturing method thereof. Background technique [0002] In liquid crystal display devices that have become widespread in recent years, various optical films such as protective films for polarizing plates, retardation films, and antireflection films are used. These optical films use polymer films. In particular, cellulose acylate films are widely used from the viewpoint of being excellent in handleability at the time of production and exhibiting favorable optical properties. [0003] As a method for producing a cellulose acylate film, a melt film forming method or a solution film forming method is known. The melt film forming method is a method of extruding melted cellulose acylate into a film to obtain a cellulose acylate film. The solution film-forming method is a method in which a solution obtained by dissolving cellulose acylate in a solvent (hereina...

Claims

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Application Information

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IPC IPC(8): B01D24/02C08J5/18C08L1/12
Inventor 长浜慎太郎鹫谷公人
Owner FUJIFILM CORP