EP0345151A2
Expired / Lapsed
EP
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Method for production of hollow fiber membrane
Assignee: Asahi Kasei Medical Co Ltd
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Filing: 1989-05-30
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Granted: —
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Expires: 2009-05-30
Abstract
Abstract A method comprising the steps of discharging a spinning dope through an annular spinning nozzle and, at the same time, introducing a non-coagulating liquid for the spinning dope into the central cavity in a hollow fiber of the spinning dope being discharged, and then introducing the discharged fiber of the spinning dope into a coagulating liquid thereby solidifying the discharged fiber into a hollow fiber membrane, which method is characterized by incorporating a surface modifying agent in said non-coagulating liquid thereby modifying the inner surface behavior of the produced hollow fiber membrane.
Inventors
- 👤 Masatomi C/O Terumo Kabushiki Kaisha Sasaki
- 👤 Nobuyoshi C/O Terumo Kabushiki Kaisha Kashiwagi
- 👤 Hiroki C/O Terumo Kabushiki Kaisha Sakakibara
- 👤 Makoto C/O Terumo Kabushiki Kaisha Saruhashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 03:34
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; B; B01; B01D; B01D69/00; B01D69/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A method for the production of a hollow fiber membrane by the steps of discharging a spinning dope through an annular spinning nozzle and, at the same time, introducing a non-coagulating liquid for the spinning dope into the central cavity in a hollow fiber of the spinning dope being discharged, and then introducing the discharged fiber of the spinning dope into a coagulating liquid thereby solidifying the discharged fiber into a hollow fiber membrane, which method is characterized by incorporating a surface modifying agent in said non-coagulating liquid thereby modifying the inner surface behavior of the produced hollow fiber membrane.
Claim 2
Independent Claim
100 words
A method for the production of a hollow fiber membrane by the steps of discharging a spinning dope through an annular spinning nozzle and, at the same time, introducing a non-coagulating liquid for the spinning dope into the central cavity in a hollow fiber of the spinning dope being discharged, and then introducing the discharged fiber of the spinning dope into a coagulating liquid thereby solidifying the discharged fiber into a hollow fiber membrane, which method is characterized by incorporating a surface modifying agent in said non-coagulating liquid thereby modifying the inner surface behavior of the produced hollow fiber membrane.
Claim 3
Dependent Claim
29 words
A method according to claim 1, wherein the polymer destined to form said hollow fiber membrane contains at least a hydroxyl group, an amino group, or a carboxyl group.
Claim 4
Dependent Claim
19 words
A method according to claim 2, wherein the polymer destined to form said hollow fiber membrane is regenerated cellulose.
Claim 5
Independent Claim
25 words
A method according to anyone of claims 1 to 3, wherein said modifying agent is a compound containing a fluorine atom or a nitrogen atom.
Claim 6
Independent Claim
25 words
A method according to anyone of claims 1 to 4, wherein said modifying agent is a compound containing an epoxy group or an isocyanate group.
Claim 7
Independent Claim
23 words
A method according to anyone of claims 1 to 5, wherein said modifying agent combines both a hydrophilic moiety and a hydrophobic moiety.
Claim 8
Independent Claim
22 words
A method according to anyone of claims 1 to 6, wherein said non-coagulating liquid contains a hydrophilic organic solvent and/or a surfactant.
Claim 9
Dependent Claim
15 words
A method according to claim 7, wherein said hydrophilic organic solvent is a lower alcohol.
Claim 10
Dependent Claim
13 words
A method according to claim 7, wherein said surfactant is a nonionic surfactant.
Claim 11
Independent Claim
40 words
A method according to anyone of claims 1 to 9, which further comprises immersing the solidified hollow fiber membrane resulting from the treatment for solidification in an organic solvent exhibiting compatibility to both the non-coagulating liquid and the modifying agent.
Claim 12
Dependent Claim
30 words
A method according to claim 10, wherein said organic solvent for immersion is selected from the group consisting of lower alcohols, ketones, tetrahydrofuran, dioxane, acetonitrile, dimethyl sulfoxide, and dimethyl formamide.
References Cited (Backward Citations)
No citation records indexed.
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