Patent EP0025639B1 successfully refreshed from Google Patents.
EP0025639B1
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EP
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Process for preparing porous cellulose spherical particles
Assignee: JNC Corp
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Filing: 1980-08-01
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Granted: 1983-03-02
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Expires: 2000-08-01
Abstract
No abstract record available.
Inventors
- 👤 Yoshiaki Motozato
- 👤 Hiroaki Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 15:05
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; B; B01; B01D; B01D15/00; B01D15/08; C08J9/00; C08J9/28; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12; B01D15/26; B01D15/34; B01D15/36; B01D15/361; B01D15/38; B01D15/3804; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502; C08J2301/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A process for preparing porous cellulose spherical particles by suspending as droplets in an aqueous medium a solution of cellulose triacetate in a solvent comprising a chlorinated hydrocarbon with a boiling point lower than that of the aqueous medium, evaporating off the chlorinated hydrocarbon to give spherical particles of cellulose triacetate, and saponifying the cellulose triacetate spherical particles to give spherical particles of porous cellulose characterized in that the said solvent further comprises an aliphatic higher alcohol with 6 or more carbon atoms, that the aliphatic higher alcohol is present within the spherical particles of cellulose triacetate after evaporation of the chlorinated hydrocarbon, and that if necessary, remaining aliphatic higher alcohol is removed from the cellulose spherical particles after the saponification.
Claim 2
Dependent Claim
121 words
A process for preparing porous cellulose spherical particles by suspending as droplets in an aqueous medium a solution of cellulose triacetate in a solvent comprising a chlorinated hydrocarbon with a boiling point lower than that of the aqueous medium, evaporating off the chlorinated hydrocarbon to give spherical particles of cellulose triacetate, and saponifying the cellulose triacetate spherical particles to give spherical particles of porous cellulose characterized in that the said solvent further comprises an aliphatic higher alcohol with 6 or more carbon atoms, that the aliphatic higher alcohol is present within the spherical particles of cellulose triacetate after evaporation of the chlorinated hydrocarbon, and that if necessary, remaining aliphatic higher alcohol is removed from the cellulose spherical particles after the saponification.
Claim 3
Dependent Claim
20 words
A process according to Claim 1, characterized in that the aliphatic higher alcohol has from 6 to 18 carbon atoms.
Claim 4
Dependent Claim
20 words
A process according to Claim 2, characterized in that the aliphatic higher alcohol has from 6 to 12 carbon atoms.
Claim 5
Dependent Claim
32 words
A process according to Claim 1, 2 or 3, characterized in that the aliphatic higher alcohol is used in an amount of 0.1 to 15 times the weight of the cellulose triacetate.
Claim 6
Dependent Claim
30 words
A process according to Claim 4, characterized in that the aliphatic higher alcohol is used in an amount of from 0.3 to 7 times the weight of the cellulose triacetate.
Claim 7
Dependent Claim
36 words
A process according to any preceding Claim, characterized in that the amount of cellulose triacetate in the solution is from 0.1 to 15% based on the total amount of the chlorinated hydrocarbon and the cellulose triacetate.
Claim 8
Dependent Claim
36 words
A process according to any preceding Claim, characterized in that the temperature for evaporating and removing the chlorinated hydrocarbon is between the freezing point of the aqueous medium and the boiling point of the chlorinated hydrocarbon.
Claim 9
Dependent Claim
16 words
A process according to Claim 7, characterized in that the evaporating temperature is 15°C or above.
Claim 10
Dependent Claim
26 words
A process according to Claim 7 or 8, characterized in that the evaporating temperature is 2°C or more below the boiling point of the chlorinated hydrocarbon.
Claim 11
Dependent Claim
16 words
A process according to any preceding Claim, characterized in that the aqueous medium contains a dispersant.
References Cited (Backward Citations)
No citation records indexed.
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