Porous cellulose particles and method for producing same
AssigneeDaicel Corporation
InventorsToru Shibata, Hiromichi Okura, Yuki Hirabayashi
Life of this patent
Estimating the term…
Abstract
Provided are porous cellulose particles containing chitosan and having predetermined pores on a surface and a predetermined particle diameter, and a method for producing the porous cellulose particles. Porous cellulose particles including unsubstituted cellulose and chitosan, wherein a content of the chitosan is not greater than 20 mass % in a total of 100 mass % of the unsubstituted cellulose and the chitosan, pores having a diameter from 0.05 to 5 μm are observed in an image of surfaces of the porous cellulose particles observed by a scanning electron microscope, and a proportion of porous cellulose particles having a particle diameter from 10 to 200 μm is not less than 90 mass %.
Claims5
Porous cellulose particles comprising:
- unsubstituted cellulose and chitosan,
- wherein a content of the chitosan is not less than 3 mass % and not greater than 8 mass % in a total of 100 mass % of the unsubstituted cellulose and the chitosan,
- pores having a diameter from 0.05 to 5 μm are observed in an image of surfaces of the porous cellulose particles observed by a scanning electron microscope, and
- a proportion of porous cellulose particles having a particle diameter from 10 to 200 μm is not less than 90 mass %.
A method for producing porous cellulose particles, comprising:
- preparing a mixed solution in which an unsubstituted cellulose solution, a chitosan solution, and a solvent of the mixed solution are mixed;
- and
- bringing the mixed solution into contact with a coagulation solvent,
- wherein the solvent of the mixed solution is an aqueous solution containing alkali hydroxide and urea, and wherein the porous cellulose particles comprise:
- unsubstituted cellulose and chitosan,
- wherein a content of the chitosan is not less than 3 mass % and not greater than 8 mass % in a total of 100 mass % of the unsubstituted cellulose and the chitosan, pores having a diameter from 0.05 to 5 μm are observed in an image of surfaces of the porous cellulose particles observed by a scanning electron microscope, and a proportion of porous cellulose particles having a particle diameter from 10 to 200 μm is not less than 90 mass %.
Dependencies are inferred from the claim text.