Process for preparing porous spherical cellulose particles
AssigneeChisso Corporation
InventorsMasahiko Nishikawa, Hiroaki Ishibashi, Hidenori Furukawa
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Abstract
A process for preparing porous, spherical cellulose particles which comprises suspending a cellulose organic ester solution dissolved in a chlorinated hydrocarbon solvent into an aqueous medium to form droplets of the solution, evaporating the chlorinated hydrocarbon solvent in the droplets to form cellulose organic ester spherical particles, and saponifying the cellulose organic ester spherical particles. In the aforesaid process, an acid or alkaki is added and mixed with the cellulose organic ester solution prior to suspending the cellulose organic ester solution into the aqueous medium to control the porosity of the porous, spherical cellulose particles with high reproducibility.
Claims16
Porous, spherical cellulose particles with high reproducibility, produced by dissolving a cellulose organic ester in a solvent consisting essentially of a chlorinated hydrocarbon, adding 0.001-20 wt.% (based on said cellulose organic ester) of an acid or alkali to the dissolved cellulose organic ester solution, mixing the resultant solution at a temperature from 0.degree. to 45.degree. C. for a period of time from 0.2 to 30 hours, suspending said cellulose organic ester solution in an aqueous medium to thereby form droplets, removing said solvent by evaporation to form cellulose organic ester particles, and saponifying said cellulose particles, the excluded critical molecular weight and the degree of porosity of the porous, spherical cellulose particles being capable of being varied as desired by varying the amount of the acid or alkali to be added.
Porous, spherical cellulose particles with high reproducibility, produced by dissolving a cellulose organic ester in a solvent consisting essentially of a chlorinated hydrocarbon, mixing the resultant solution at a temperature from 0.degree. to 45.degree. C. for a period of time of from 0.2 to 30 hours, suspending said cellulose organic ester solution in an aqueous medium to thereby form droplets, removing said solvent by evaporation to form cellulose organic ester particles, and saponifying said cellulose particles, 0.001 to 20 wt% (based on said cellulose organic ester) of an acid or alkali being added to said solvent while the cellulose organic ester is being dissolved or prior to said dissolution, the excluded critical molecular weight and the degree of porosity of the porous, spherical cellulose particles being capable of being varied as desired by varying the amount of the acid or alkali to be added.
Dependencies are inferred from the claim text.