Patent US4484935A successfully refreshed from Google Patents.
US4484935A
Expired / Lapsed
US
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Permeation modified membrane
Assignee: Permea Inc
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Filing: 1983-06-30
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Granted: 1984-11-27
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Expires: 2003-06-30
Abstract
Abstract A multicomponent membrane having improved permeation characteristics for separation of one gas from a mixture of gases by permeation of the one gas through the membrane. The membrane is in the form of a porous, anisotropic substrate membrane and a coating in contact with the substrate membrane, the coating being made of poly(dimethyl siloxane), containing 1 to 20 weight percent of a permeation-modifying radical selected from the group consisting of <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> +TR <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> <IMAGE> The coating is applied to the substrate in the form of a solution of 0.05 to 1 weight percent of the coating in a suitable solvent such as pentane.
Inventors
- 👤 Anthony Zampini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:30
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/26; B; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D71/00; B01D71/06; B01D71/76; B01D71/80; C08L; C08L83/00; C08L83/04; C08G77/14; C08G77/16; C08G77/18
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A multicomponent membrane for gas separations, comprising a. a porous substrate membrane, and b. a coating of poly(dimethyl siloxane) in contact with said membrane, said coating containing 1 to 20 parts per hundred, based on 100 parts of said poly(dimethyl siloxane), of a permeation modifying radical bonded to said poly(dimethyl siloxane), said permeation modifying radical being selected from the group consisting of ##STR17##
Claim 2
Dependent Claim
63 words
A multicomponent membrane for gas separations, comprising a. a porous substrate membrane, and b. a coating of poly(dimethyl siloxane) in contact with said membrane, said coating containing 1 to 20 parts per hundred, based on 100 parts of said poly(dimethyl siloxane), of a permeation modifying radical bonded to said poly(dimethyl siloxane), said permeation modifying radical being selected from the group consisting of ##STR17##
Claim 3
Dependent Claim
26 words
The multicomponent membrane of claim 1 wherein the coating contains 2 to 12 parts of said permeation modifying radical per hundred parts of said poly(dimethyl siloxane).
Claim 4
Dependent Claim
41 words
The multicomponent membrane of claim 2 wherein the coating is the condensation product of poly(dimethyl siloxane) diol and a permeation modifying agent having the structure (R.sub.1).sub.3 R.sub.2 where R 1 is methoxy, ethoxy or acetoxy and R 2 is said radical.
Claim 5
Dependent Claim
30 words
The multicomponent membrane of claim 3 wherein the coating is the condensation product of 100 parts of poly(dimethyl siloxane) diol and 2 to 12 parts of said permeation modifying agent.
Claim 6
Dependent Claim
42 words
The coating of claim 4 wherein the coating is the condensation product of 100 parts of poly(dimethyl siloxane) diol and 2 to 12 parts of said permeation modifying agent dissolved in sufficient solvent to form a 0.01 to 5 weight percent solution.
Claim 7
Dependent Claim
13 words
The coating of claim 5 wherein said weight percent is 0.05 to 1.
Claim 8
Dependent Claim
23 words
The membrane of claim 6 wherein the substrate is made from a polysulfone polymer and is in the form of a hollow fiber.
Claim 9
Dependent Claim
32 words
The membrane of claim 7 wherein said substrate has a void volume of 10 to 90 percent and a porosity such that the average pore cross-sectional diameter is 5 to 20,000 Angstroms.
Claim 10
Dependent Claim
17 words
The membrane of claim 8 wherein the coating has a thickness of 5,000 Angstroms to 50 microns.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |