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US 11,685,793 B2Granted
Method for producing porous cellulose particles, and porous cellulose particles
AssigneeJnc Corporation
InventorsToru Kurabayashi, Shigeyuki Aoyama, Akihiro Uchida
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Abstract
One embodiment shows a method for producing porous cellulose particles, including: (a) dissolving cellulose diacetate into a solvent to prepare a cellulose diacetate solution; (b) dispersing the cellulose diacetate solution into a medium immiscible with the cellulose diacetate solution to obtain a dispersed system; (c) cooling the dispersed system; (d) adding a poor solvent to the cooled dispersed system to precipitate cellulose diacetate particles; and (e) saponifying the cellulose diacetate particles.
Claims8
A method for producing porous cellulose particles, comprising:
- (a) dissolving cellulose diacetate into a solvent to prepare a cellulose diacetate solution, wherein the solvent for the cellulose diacetate solution is ethyl acetate, butyl acetate, or a mixture thereof;
- (b) dispersing the cellulose diacetate solution into a medium immiscible with the cellulose diacetate solution to obtain a dispersed system, wherein a temperature of the medium is 40° C. to 100° C., in the (b), a surfactant is added to the medium, and the surfactant is selected from the group consisting of sorbitan monooleate, polyethylene glycol, alkyl glycoside, and a polyoxyethylene-methylpolysiloxane copolymer;
- (c) cooling the dispersed system, wherein the cooling is performed by cooling the dispersed system to a temperature of 40° C. or lower;
- (d) adding a poor solvent to the cooled dispersed system to precipitate cellulose diacetate particles, wherein the poor solvent is water, alcohols, glycols or a mixed liquid thereof;
- and
- (e) saponifying the cellulose diacetate particles.
3 more elements
Dependencies are inferred from the claim text.