US5013338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasma-assisted polymerization of monomers onto polymers and gas separation membranes produced thereby
Assignee: Air Products and Chemicals Inc
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Filing: 1989-09-01
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Granted: 1991-05-07
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Expires: 2009-09-01
Abstract
Abstract A composite of a rigid, glassy, permeable membrane of a silyl or germyl-containing polyacetylene and a thin surface layer of a plasma polymerized monomer having pendant nitrogen heterocycles is provided; the composite has high flux and selectivity and is particularly useful for separating gas mixtures containing at least two components having different permeabilities through the composite structure.
Inventors
- 👤 Madhu Anand
- 👤 Christine A. Costello
- 👤 Keith D. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:24
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/62; B01; B01D; B01D69/00; B01D69/12; B01D69/125; B01D69/127; B01D71/00; B01D71/06; B01D71/44; C; C08; C08F; C08F8/00; C08F8/42; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; B05D2201/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A composite of a rigid, glassy semi-permeable membrane produced by forming a substrate membrane from a silyl or germyl-containing polyacetylene polymer, exposing the substrate membrane to vapors of a monomer containing pendant nitrogen heterocycles for between 15 seconds and 15 minutes at a pressure from 0.025 to 0.5 torr such that said substrate sorbs monomer vapor, subsequently discontinuing the flow of monomer vapor and lighting a plasma with a carrier gas in the presence of said substrate at a power of from 33 to 300 watts and a pressure from 0.05 to 1 torr for 30 seconds to 2 hours, such that the monomer is plasma polymerized in-situ onto the surface of the substrate membrane.
Claim 2
Dependent Claim
115 words
A composite of a rigid, glassy semi-permeable membrane produced by forming a substrate membrane from a silyl or germyl-containing polyacetylene polymer, exposing the substrate membrane to vapors of a monomer containing pendant nitrogen heterocycles for between 15 seconds and 15 minutes at a pressure from 0.025 to 0.5 torr such that said substrate sorbs monomer vapor, subsequently discontinuing the flow of monomer vapor and lighting a plasma with a carrier gas in the presence of said substrate at a power of from 33 to 300 watts and a pressure from 0.05 to 1 torr for 30 seconds to 2 hours, such that the monomer is plasma polymerized in-situ onto the surface of the substrate membrane.
Claim 3
Dependent Claim
86 words
The composite of claim 1 wherein the polyacetylene polymer has the general formula: ##STR3## wherein X is phenylene or a C 1 -C 3 alkyl group, Y is Si or Ge, R 1 is a linear or branched C 1 -C 4 alkyl group, R 2 and R 3 are independently linear or branched C 1 -C 6 alkyl groups, R 4 is a linear or branched C 1 -C 12 alkyl or aryl group, m is at least 100, and n is 0 or 1.
Claim 4
Dependent Claim
80 words
The composite of claim 2 wherein the polyacetylene polymer has the formula: ##STR4## wherein X is phenylene or a C 1 -C 3 alkyl group, R 1 is a linear or branched C 1 -C 4 alkyl group, R 2 and R 3 are independently linear or branched C 1 -C 6 alkyl groups, R 4 is a linear or branched C 1 -C 12 alkyl or aryl group, m is at least 100, and n is 0 or 1.
Claim 5
Dependent Claim
7 words
The composite of claim 3 wherein n=0.
Claim 6
Dependent Claim
21 words
The composite of claim 4 wherein R 1 , R 2 , R 3 , and R 4 are methyl groups.
Claim 7
Dependent Claim
80 words
The composite of claim 2 wherein the polyacetylene polymer has the formula: ##STR5## wherein X is phenylene or a C 1 -C 3 alkyl group, R 1 is a linear or branched C 1 -C 4 alkyl group, R 2 and R 3 are independently linear or branched C 1 -C 6 alkyl groups, R 4 is a linear or branched C 1 -C 12 alkyl or aryl group, m is at least 100, and n is 0 or 1.
Claim 8
Dependent Claim
21 words
The composite of claim 6 wherein R 1 , R 2 , R 3 , and R 4 are methyl groups.
Claim 9
Dependent Claim
7 words
The composite of claim 2 wherein n=0.
Claim 10
Dependent Claim
28 words
The composite of claim 1 wherein the monomer is selected from the group consisting of pendant pyridine-containing acetylenic compounds, 4-vinylpyridine, 2-vinylpyridine, vinylpyrazine, vinylimidazole, vinyl-2-pyrrolidone, methyl-2-pyrrolidone, and mixtures thereof.
Claim 11
Dependent Claim
117 words
A process for producing a rigid, glassy semi-permeable membrane, said process comprising: forming a substrate membrane from a silyl or germyl-containing polyacetylene polymer, exposing the substrate membrane to vapors of a monomer containing pendant nitrogen heterocycles for between 15 seconds and 15 minutes at a pressure from 0.025 to 0.5 torr such that said substrate sorbs monomer vapor, subsequently discontinuing the flow of monomer vapor and lighting a plasma with a carrier gas in the presence of said substrate at a power of from 33 to 300 watts and a pressure from 0.05 to 1 torr for 30 seconds to 2 hours, such that the monomer is plasma polymerized in-situ onto the surface of the substrate membrane.
Claim 12
Dependent Claim
117 words
A process for producing a rigid, glassy semi-permeable membrane, said process comprising: forming a substrate membrane from a silyl or germyl-containing polyacetylene polymer, exposing the substrate membrane to vapors of a monomer containing pendant nitrogen heterocycles for between 15 seconds and 15 minutes at a pressure from 0.025 to 0.5 torr such that said substrate sorbs monomer vapor, subsequently discontinuing the flow of monomer vapor and lighting a plasma with a carrier gas in the presence of said substrate at a power of from 33 to 300 watts and a pressure from 0.05 to 1 torr for 30 seconds to 2 hours, such that the monomer is plasma polymerized in-situ onto the surface of the substrate membrane.
Claim 13
Dependent Claim
17 words
The process of claim 10 wherein the monomer is purified before the substrate membrane is exposed thereto.
Claim 14
Dependent Claim
22 words
The process of claim 10 wherein the thickness of the plasma polymerized monomer layer ranges from about 100A to about 0.5 micron.
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |