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US4755193A
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Polymer and a membrane having an improved gas-permeability and selectivity
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1983-09-28
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Granted: 1988-07-05
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Expires: 2003-09-28
Abstract
Abstract A permselective membrane having improved gas-permeability and selectivity is obtained from a polymer of 1-alkyldimethylsilyl-1-propyne.
Inventors
- 👤 Toshinobu Higashimura
- 👤 Toshio Masuda
- 👤 Koichi Takada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:16
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/44; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; C01B13/0255; C08; C08F; C08F138/00; C01B2210/00; C01B2210/0043; C01B2210/0046
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
51 words
A permselective membrane having an improved gas-permeabilty, said membrane being comprised of a polymer having an O 2 permeability constant of about 10 -9 to about 10 -6 cc·cm/cm 2 ·sec·cmHg, wherein said polymer has repeating units of the formula: ##STR4## wherein R is an alkyl radical containing 1-4 carbon atoms.
Claim 2
Dependent Claim
51 words
A permselective membrane having an improved gas-permeabilty, said membrane being comprised of a polymer having an O 2 permeability constant of about 10 -9 to about 10 -6 cc·cm/cm 2 ·sec·cmHg, wherein said polymer has repeating units of the formula: ##STR4## wherein R is an alkyl radical containing 1-4 carbon atoms.
Claim 3
Dependent Claim
16 words
The membrane of claim 1, wherein the polymer has a molecular weight of at least 10,000.
Claim 4
Dependent Claim
13 words
The membrane of claim 1, wherein the polymer is a polymer of 1-trimethylsilyl-1-propyne.
Claim 5
Dependent Claim
11 words
The membrane of claim 1, which has a thickness of 0.01-100μ.
Claim 6
Dependent Claim
18 words
The membrane of claim 1, which has an O 2 /N 2 separation factor of about 1.5-about 5.
Claim 7
Dependent Claim
39 words
The membrane of claim 1, composed of the polymer (a) having the repeating units of the formula (1), and at least one polymer selected from the group consisting of polyorganosiloxanes, olefinic polymers, cellulosic materials, polyalkylsulfones, and nitrogen atom-containing polymers.
Claim 8
Dependent Claim
19 words
The membrane of claim 6, which contains said polymer (a) in an amount of at least 20% by weight.
Claim 9
Dependent Claim
32 words
The membrane of claim 1, which has a backing layer of at least one porous material selected from the group consisting of papers, porous or microporous plastic films, fabrics and porous glass.
Claim 10
Dependent Claim
22 words
The membrane of claim 1, having an O 2 permeability constant of about 10 -8 to about 10 -6 cc·cm/cm 2 ·sec·cmHg.
Claim 11
Independent Claim
39 words
A method for separating a specific gas from a gas mixture, by using a permselective membrane comprised of a polymer having repeating units of the formula: ##STR5## wherein R is an alkyl radical containing 1 to 4 carbon atoms.
Claim 12
Independent Claim
39 words
A method for separating a specific gas from a gas mixture, by using a permselective membrane comprised of a polymer having repeating units of the formula: ##STR5## wherein R is an alkyl radical containing 1 to 4 carbon atoms.
Claim 13
Dependent Claim
25 words
The method of claim 10, wherein the membrane has an O 2 permeability constant of about 10 -9 to about 10 -6 cc·cm/cm 2 ·sec·cmHg.
Claim 14
Dependent Claim
16 words
The method of claim 10, wherein the polymer has a molecular weight of at least 10,000.
Claim 15
Dependent Claim
13 words
The method of claim 10, wherein the polymer is a polymer of 1-trimethylsilyl-1-propyne.
Claim 16
Dependent Claim
13 words
The method of claim 10, wherein said membrane has a thickness of 0.01-100μ.
Claim 17
Dependent Claim
20 words
The method of claim 10, wherein said membrane has an O 2 /N 2 separation factor of about 1.5-about 5.
Claim 18
Dependent Claim
43 words
The method of claim 10, wherein said membrane is composed of the polymer (a) having the repeating units of the formula (I), and at least one polymer selected from the group consisting of polyorganosiloxanes, olefinic polymers, cellulosic materials, polyalkylsulfones and nitrogen atom-containing polymers.
Claim 19
Dependent Claim
21 words
The method of claim 16, wherein said membrane contains said polymer (a) in an amount of at least 20% by weight.
Claim 20
Dependent Claim
34 words
The method of claim 10, wherein said membrane has a backing layer of at least one porous material selected from the group consisting of papers, porous or microporous plastic films, fabrics and porous glass.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |