EP0216633A2
Expired / Lapsed
EP
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Composite membrane comprising porous hollow fibers and process for producing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1986-09-23
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Granted: —
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Expires: 2006-09-23
Abstract
Abstract Disclosed are a composite membrane comprised of porous hollow fibers which comprises a support membrane of porous hollow fibers which is coated either on the outer surface of the inner surface or on both surfaces with a membrane formed by plasma-assisted polymerization, said support membrane being principally formed of poly(2,6-dimethylphenylene oxide) having a recurring unit represented by the structural formua: (n: natural number).
Inventors
- 👤 Katsuya C/O Osaka Works Yamada
- 👤 Shigeru C/O Osaka Works Asako
- 👤 Koichi C/O Osaka Works Okita
- 👤 Shin-Ichi C/O Osaka Works Toyo-Oka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 08:52
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127; B01D69/08
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
54 words
A composite membrane comprising a support membrane of porous hollow fibers which is deposited, either on the outer surface or the inner surface or on both surfaces, with a film formed by plasma polymerization, said support membrane consisting essentially of poly(2,6-dimethylphenylene oxide) having a repeating unit represented by the structural formula: (n: natural number).
Claim 2
Dependent Claim
54 words
A composite membrane comprising a support membrane of porous hollow fibers which is deposited, either on the outer surface or the inner surface or on both surfaces, with a film formed by plasma polymerization, said support membrane consisting essentially of poly(2,6-dimethylphenylene oxide) having a repeating unit represented by the structural formula: (n: natural number).
Claim 3
Dependent Claim
62 words
A composite membrane as in claim 1, wherein either the outer surface or the inner surface or both surfaces of said support membrane of porous hollow fibers has an average pore size of 0.1 micrometer or less or non-porous, wherein the thin wall part of said support membrane has a porous structure with pores of varying sizes toward each of the surfaces.
Claim 4
Dependent Claim
27 words
A composite mambrane as in claim 2, wherein either the outer surface or the inner surface or both surfaces of said support membrane have a dense structure.
Claim 5
Dependent Claim
21 words
A composite membrane as in claim 1, wherein said film formed by plasma polymerization is made of an organic silicon compound.
Claim 6
Dependent Claim
27 words
A composite membrane as in claim 4, wherein said film formed by plasma polymerization is made of an organic silane compound having at least one unsaturated bond.
Claim 7
Dependent Claim
66 words
A composite membrane as in claim 5, wherein said organic silane compound is represented by the structural formula: X n - Si - Y 4 - n wherein n is a natural number of from 1 to 4; X each represent CH 2 =CH-, CH = C- or CH 2 =CH-CH 2 -; and Y each represent CH 3 - or CH 3 -CH 2 -.
Claim 8
Dependent Claim
16 words
A composite membrane as in claim 6, wherein said organic silane compound is methyltrivinylsilane or ethynyltrimethylsilane.
Claim 9
Dependent Claim
23 words
A composite membrane as in claim 1, wherein said film formed by plasma polymerization has a thickness of not more than 10 micrometer.
Claim 10
Dependent Claim
23 words
A composite membrane as in claim 8, wherein said film formed by plasma polymerization has a thickness of not more than 1 micrometer.
Claim 11
Dependent Claim
23 words
A composite membrane as in claim 9, wherein said film formed by plasma polymerization has a thickness of not more than 0.3 micrometer.
Claim 12
Dependent Claim
130 words
ll. A process for producing a composite membrane comprising the steps of (a) dissolving in a nitrogen-containing heterocyclic compound a poly(2,6-dimethylphenylene oxide) having a repeating unit represented by the structural formula: (n: natural number); (b) extruding the resulting solution under heating into a coagulating bath through the outer tube of a sheathed nozzle while, at the same time, a core liquid is caused to flow through the inner tube of said sheathed nozzle; (c) coagulating the resulting hollow fibers, extracting the solvent therefrom and drying the same to provide a support membrane comprising the porous hollow fibers; and (d) depositing a film on said support membrane by plasma polymerization with a glow discharge being produced in a polymerizable monomer while being supplied at a pressure not higher than 5 Torr.
Claim 13
Dependent Claim
130 words
ll. A process for producing a composite membrane comprising the steps of (a) dissolving in a nitrogen-containing heterocyclic compound a poly(2,6-dimethylphenylene oxide) having a repeating unit represented by the structural formula: (n: natural number); (b) extruding the resulting solution under heating into a coagulating bath through the outer tube of a sheathed nozzle while, at the same time, a core liquid is caused to flow through the inner tube of said sheathed nozzle; (c) coagulating the resulting hollow fibers, extracting the solvent therefrom and drying the same to provide a support membrane comprising the porous hollow fibers; and (d) depositing a film on said support membrane by plasma polymerization with a glow discharge being produced in a polymerizable monomer while being supplied at a pressure not higher than 5 Torr.
Claim 14
Dependent Claim
27 words
A process for producing a composite membrane as in claim 11, wherein said solution of a poly(2,6-dimethylphenylene oxide) has a concentration of from 10 to 50 wt%.
Claim 15
Dependent Claim
27 words
A process for producing a composite membrane as in claim 12, wherein said solution of a poly(2,6-dimethylphenylene oxide) has a concentration of from 20 to 40 wt%.
Claim 16
Dependent Claim
18 words
A process for producing a composite membrane as in claim 11, wherein said nitrogen-containing heterocyclic compound is N-methyl-2-pyrrolidone.
Claim 17
Dependent Claim
52 words
A process for producing a composite membrane as in claim 11, wherein said solution of a poly(2,6-dimethylphenylene oxide) is extruded into said coagulating bath while being maintained at a temperature not lower than the point at which said -solution gels and not higher than the boiling point of said nitrogen-containing heterocyclic compound.
Claim 18
Dependent Claim
26 words
A process for producing a composite membrane as in claim 11, wherein the coagulated hollow fibers are extracting the solvent therefrom by washing with hot water.
Claim 19
Dependent Claim
20 words
A process for producing a composite membrane as in claim 11, wherein said polymerizable monomer is an organic silicon compound.
Claim 20
Dependent Claim
26 words
A process for producing a composite membrane as in claim 17, wherein said polymerizable monomer is an organic silane compound having at least one unsaturated bond.
Claim 21
Dependent Claim
64 words
A process for producing a composite membrane as in claim 18, wherein said organic silane compound has the structural formula: X n - Si - Y 4 - n wherein n is a natural number of 1 to 4; X each represents CH 2 =CH-, CH = C- or CH 2 =CH-CH 2 -; and Y each represent CH 3 -or CH 3 -CH2-.
Claim 22
Dependent Claim
20 words
A process for producing a composite membrane as in claim 19, wherein said organic silane compound is methyltrivinylsilane or ethynyltrimethylsilane.
Claim 23
Dependent Claim
27 words
A process for producing a composite membrane as in claim 11, wherein said film formed by plasma polymerization has a thickness of not more than 10 micrometer.
Claim 24
Dependent Claim
27 words
A process for producing a composite membrane as in claim 21, wherein said film formed by plasma polymerization has a thickness of not more than 1 micromter.
References Cited (Backward Citations)
No citation records indexed.
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