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Selectively gas-permeable composite membrane and process for production thereof
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-04-18
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Granted: 1984-11-20
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Expires: 2003-04-18
Abstract
Abstract A selectively gas-permeable composite membrane and a process for producing said composite membrane are described. The composite membrane comprises a polymeric material support and a thin membrane deposited on the support, said thin membrane being obtained by glow discharge plasma polymerization of an organosilane compound containing at least one double bond or triple bond. Alternatively, the composite membrane comprises a polymeric material support having an average pore diameter of at least 0.1 micron, a hardened or cross-linked polyorganosiloxane layer on the support, and a thin membrane on the polyorganosiloxane layer, said thin membrane being obtained by plasma polymerization due to glow discharge of an organosilane compound containing at least one double bond or triple bond.
Inventors
- 👤 Koichi Okita
- 👤 Sigeru Asako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:20
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127; B01D71/00; B01D71/06; B01D71/44; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249981; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A selectively gas-permeable membrane comprising a polymeric material support and a thin membrane desposited on the support, said thin membrane being obtained by glow discharge plasma polymerization of an organosilane compound containing at least one double bond or triple bond.
Claim 2
Dependent Claim
40 words
A selectively gas-permeable membrane comprising a polymeric material support and a thin membrane desposited on the support, said thin membrane being obtained by glow discharge plasma polymerization of an organosilane compound containing at least one double bond or triple bond.
Claim 3
Dependent Claim
44 words
The membrane as claimed in claim 1, wherein the organosilane compound is represented by the formula: R.sub.n --Si--X.sub.4-n wherein n=1 to 4; R=CH 2 ═CH--, CH.tbd.C--, or CH 2 ═CH--CH 2 --; and X=H, Cl, CH 3 --, or CH 3 --CH 2 --.
Claim 4
Dependent Claim
23 words
The membrane as claimed in claim 1, wherein the boiling point at atmospheric pressure of the organosilane compound is 130° C. or lower.
Claim 5
Dependent Claim
25 words
The membrane as claimed in claim 1, wherein the organosilane compound is selected from the group consisting of dimethylvinylchlorosilane, trimethylvinylsilane, methyltrivinylsilane, tetravinylsilane, ethynyltrimethylsilane, and allyltrimethylsilane.
Claim 6
Dependent Claim
36 words
The membrane as claimed in claim 1, wherein the polymeric material support comprises a coating of polyorganosiloxane coated and cross-linked on a porous polymeric material membrane having an average pore diameter of at least 0.1 micron.
Claim 7
Dependent Claim
22 words
The membrane as claimed in claim 1, wherein the polymeric material support has an average pore size of 0.1 micron or less.
Claim 8
Dependent Claim
19 words
The membrane as claimed in claim 5, wherein the polyorganosiloxane compound contains a phenyl group or a vinyl group.
Claim 9
Dependent Claim
124 words
A process for producing a selectively gas-permeable membrane comprising the steps of: providing a polymeric material support in a vessel wherein; (i) the support is a porous polymeric material membrane having an average pore diameter of 0.1 micron or less or, (ii) the support is prepared by coating a solution of polyorganosiloxane on a porous polymeric material membrane having an average pore diameter of at least 0.1 micron, evaporating the solvent, and thereafter, hardening or cross-linking said polyorganosiloxane; introducing an organosilane compound containing at least one double bond or triple bond in a vapor form into the vessel with an atmosphere maintained at 5 torr or less; and plasma-polymerizing said compound by application of glow discharge to deposit it on the polymeric material support.
Claim 10
Dependent Claim
124 words
A process for producing a selectively gas-permeable membrane comprising the steps of: providing a polymeric material support in a vessel wherein; (i) the support is a porous polymeric material membrane having an average pore diameter of 0.1 micron or less or, (ii) the support is prepared by coating a solution of polyorganosiloxane on a porous polymeric material membrane having an average pore diameter of at least 0.1 micron, evaporating the solvent, and thereafter, hardening or cross-linking said polyorganosiloxane; introducing an organosilane compound containing at least one double bond or triple bond in a vapor form into the vessel with an atmosphere maintained at 5 torr or less; and plasma-polymerizing said compound by application of glow discharge to deposit it on the polymeric material support.
Claim 11
Dependent Claim
44 words
The process as claimed in claim 8, wherein the organosilane compound is represented by the formula: R.sub.n --Si--X.sub.4-n wherein n=1 to 4; R=CH 2 ═CH--, CH.tbd.C--, or CH 2 ═CH--CH 2 --; and X=H, Cl, CH 3 --, or CH 3 CH 2 --.
Claim 12
Dependent Claim
33 words
A selectively gas-permeable membrane as claimed in claim 1, wherein the organosilane compound is a compound selected from the group consisting of dimethylvinylchlorosilane, trimethylvinylsilane, methyltrivinylsilane, tetravinylsilane, ethynyltrimethylsilane, allyltrimethylsilane, monomethylvinylsilane, allyldimethylvinylsilane, allyldimethylsilane, and allyldimethylchlorosilane.
Claim 13
Dependent Claim
29 words
A process as claimed in claim 8, wherein the reduced pressure is 2 Torr or less at a high frequency at an output of from 5 to 150 w.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-20 | 1988-05-21 | 1988-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-20 | 1992-05-21 | 1992-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-20 | 1996-05-21 | 1996-11-20 | $7700.00 | Window Closed / Lapsed |