Method of producing dispersion
AssigneeFUJIFILM Corporation
InventorYukihiro Katai
Life of this patent
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Abstract
A solvent and TAC particles are continuously supplied to a disperser. When the shearing of the solvent and the particles are made in a shearing section, the particles are dispersed in the solvent. The dispersion is fed to a mixer in one minute. The shearing of the dispersion is made in the mixer, the particles are swollen in the solvent in one minute. Since the shearing and the continuous feed of the swelling solution is made, the aggregation does not occur. There are no undissolved aggregates in a dope, which is obtained from the swelling solution. A film produced from the dope has no defects of luminescent spot but excellent optical properties.
Claims21
A method of producing a cellulose acylate dope, comprising steps of:
- continuously supplying cellulose acylate and a solvent into a disperser;
- feeding said cellulose acylate and said solvent through said disperser in a retention time of 1 second to thirty seconds before said cellulose acylate is swelled, so as to disperse said cellulose acylate in said solvent to obtain a dispersion;
- continuously supplying said dispersion into a shearing device;
- swelling said dispersion in said shearing device by retaining said dispersion in said shearing device for at least 30 seconds to obtain a swelling solution;
- supplying said swelling solution into a dope production apparatus;
- and
- heating said swelling solution by said dope production apparatus and dissolving said cellulose acylate in said dope production apparatus to obtain a dope of said cellulose acylate.
A method of producing a cellulose acylate swelling solution, comprising the steps of:
- continuously supplying cellulose acylate and a solvent into a disperser to disperse said cellulose acylate in said solvent before swelling for a time of 1 second to 30 seconds, to obtain a cellulose acylate dispersing solution;
- and
- continuously supplying said cellulose acylate dispersing solution to a shearing device to obtain a cellulose acylate swelling solution.
Dependencies are inferred from the claim text.