EP0047064B1
Expired / Lapsed
EP
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Process for preparing porous, spherical cellulose particles
Assignee: JNC Corp
•
Filing: 1981-07-28
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Granted: 1985-10-02
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Expires: 2001-07-28
Abstract
No abstract record available.
Inventors
- 👤 Masahiko Nishikawa
- 👤 Hiroaki Ishibashi
- 👤 Hidenori Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:48
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08B; C08B3/00; C08B3/22; C08B3/24; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502; C08J2301/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
A process for preparing porous, spherical cellulose particles in which a solution of a cellulose organic ester in a solvent comprising chlorinated hydrocarbon is suspended in an aqueous medium to form droplets, solvent in the droplets is evaporated to form cellulose organic ester particles, and the cellulose organic ester particles are saponified, characterized in that an acid or alkali is mixed with the cellulose organic ester solution prior to suspending the solution in the aqueous medium.
Claim 2
Dependent Claim
76 words
A process for preparing porous, spherical cellulose particles in which a solution of a cellulose organic ester in a solvent comprising chlorinated hydrocarbon is suspended in an aqueous medium to form droplets, solvent in the droplets is evaporated to form cellulose organic ester particles, and the cellulose organic ester particles are saponified, characterized in that an acid or alkali is mixed with the cellulose organic ester solution prior to suspending the solution in the aqueous medium.
Claim 3
Dependent Claim
29 words
A process according to Claim 1, wherein the cellulose organic ester is at least one of cellulose acetate, cellulose acetate butylate, cellulose butylate, cellulose propionate, and cellulose acetate propionate.
Claim 4
Dependent Claim
33 words
A process according to Claim 1 or 2, wherein the concentration of the cellulose organic ester dissolved in the chlorinated hydrocarbon solvent is in the range of from 1 to 15% by weight.
Claim 5
Dependent Claim
50 words
A process according to Claim 1, 2 or 3, wherein the chlorinated hydrocarbon consists of at least one of dichloromethane, trichloromethane, carbon tetrachloride, trichloroethane, tetrachloroethane, trichloroethylene, and tetrachloroethylene, optionally as the major component in a mixed solvent with at least one other solvent which is methanol, ethanol, acetone, or nitromethane.
Claim 6
Dependent Claim
18 words
A process according to any preceding Claim, wherein acid is added to the solution prior to suspending it.
Claim 7
Dependent Claim
33 words
A process according to Claim 5, wherein the acid is an inorganic acid, preferably at least one of hydrochloric acid, hydrobromic acid, hydrofluoric acid, sulphuric acid, sulphurous acid, phosphoric acid, and nitric acid.
Claim 8
Dependent Claim
13 words
A process according to Claim 5, wherein the acid is a sulphonic acid.
Claim 9
Dependent Claim
21 words
A process according to any of Claims 1 to 4, wherein alkali is added to the solution prior to suspending it.
Claim 10
Dependent Claim
20 words
A process according to Claim 8, wherein the alkali is a hydroxide of an alkali metal or alkaline earth metal.
Claim 11
Dependent Claim
42 words
A process according to any preceding Claim, wherein the acid or alkali is added in an amount of from 0.001 to 20%, preferably from 0.01 to 15%, and more preferably from 0.05 to 10% by weight based on the cellulose organic ester.
Claim 12
Dependent Claim
30 words
A process according to any preceding Claim, wherein the acid or alkali is mixed with the cellulose organic ester solution after the cellulose organic ester is dissolved in the solvent.
Claim 13
Dependent Claim
46 words
A process according to Claim 11, wherein after dissolving the acid or alkali in the cellulose organic ester solution, the resulting solution is mixed with stirring at a temperature of from 0 to 45°C from 0.2 to 30 hours, and then added to the aqueous medium.
References Cited (Backward Citations)
No citation records indexed.
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