EP0303259A2
Expired / Lapsed
EP
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Multi-cellular cellulose particle and process for preparation thereof
Assignee: Asahi Kasei Corp
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Filing: 1988-08-10
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Granted: —
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Expires: 2008-08-10
Abstract
Abstract A multi-cellular cellulose particle having a multiplicity of cells spaced from one another by cell membranes is described, which cells have a maximum inscribed sphere diameter of larger than 2 µm. The cells have a continuous hole structure in which cells the cells communicate with one another through openings in the membranes separating two adjacent cells. The multi-cellular cellulose particle is prepared by forming drops of a solution of cellulose or a cellulose derivative, cooling the drops at a temperature lower than the solidification temperature of the solution to freeze the drops, and removing the solvent by extraction or nullifying the dissolving power of the solvent.
Inventors
- 👤 Junichi Shirokaze
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 13:12
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J9/00; C08J9/28; C08J2201/00; C08J2201/04; C08J2201/048; C08J2201/0482; C08J2201/0484; C08J2201/054; C08J2201/0545; C08J2201/0547; C08J2301/00; C08J2301/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
54 words
A multi-cellular cellulose particle having a multiplicity of cells spaced from one another by cell membranes, the cells having a maximum inscribed sphere diameter of larger than 2 µm, wherein the cells have a continuous hole structure in which the cells communicate with one another through openings in the membranes separating two adjacent cells.
Claim 2
Dependent Claim
54 words
A multi-cellular cellulose particle having a multiplicity of cells spaced from one another by cell membranes, the cells having a maximum inscribed sphere diameter of larger than 2 µm, wherein the cells have a continuous hole structure in which the cells communicate with one another through openings in the membranes separating two adjacent cells.
Claim 3
Dependent Claim
36 words
A multi-cellular cellulose particle as set forth in claim 1, wherein the ratio of cells having an inscribed sphere diameter of larger than 2 µm is at least 60% by volume based on the entire cells.
Claim 4
Dependent Claim
26 words
A multi-cellular cellulose particle as set forth in claim 1, wherein the continuous holes of the communicating cells extend radially from the surface to the interior.
Claim 5
Dependent Claim
50 words
A process for the preparation of a multi-cellular cellulose particle, which comprises forming drops of a cellulose solution, cooling the drops at a temperature lower than the solidification temperature of the solution to freeze the drops, and removing the solvent by extraction or nullifying the dissolving power of the solvent.
Claim 6
Dependent Claim
50 words
A process for the preparation of a multi-cellular cellulose particle, which comprises forming drops of a cellulose solution, cooling the drops at a temperature lower than the solidification temperature of the solution to freeze the drops, and removing the solvent by extraction or nullifying the dissolving power of the solvent.
Claim 7
Dependent Claim
59 words
A process for the preparation of a multi-cellular cellulose particle, which comprises forming drops of a cellulose derivative solution, cooling the drops at a temperature lower than the solidification temperature of the solution to freeze the drops, and removing the solvent by extraction or nullifying the dissolving power of the solvent, and regenerating the cellulose, simultaneously or in sequence.
Claim 8
Dependent Claim
59 words
A process for the preparation of a multi-cellular cellulose particle, which comprises forming drops of a cellulose derivative solution, cooling the drops at a temperature lower than the solidification temperature of the solution to freeze the drops, and removing the solvent by extraction or nullifying the dissolving power of the solvent, and regenerating the cellulose, simultaneously or in sequence.
References Cited (Backward Citations)
US4055510A
Cited
JP2006001580A
Cited
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