US4690873A
Expired / Lapsed
US
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Gas separating material
Assignee: Ube Corp
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Filing: 1985-11-22
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Granted: 1987-09-01
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Expires: 2005-11-22
Abstract
Abstract A gas separating material having excellent CO2 gas permeating property, mechanical property, and heat resistance has a gas separating layer comprising an aromatic imide polymer which contains 20 to 100 molar % of recurring units of the formula (I): <IMAGE> (I) wherein A1 is a tetravalent aromatic radical, A is a divalent aromatic radical of the formula (II): <IMAGE> (II) in which R and R1 are H or an organic radical, for example, -CH3, -C2H5, -C3H7, or -CH2OH, and n is 0, 1, or 2.
Inventors
- 👤 Hiroshi Makino
- 👤 Masayuki Nakatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:52
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1085; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A gas separating material having a gas separating layer comprising at least one aromatic imide polymer which contains at least 20 molar % of at least one type of recurring unit of the formula (I): ##STR13## wherein A 1 represents a tetravalent aromatic radical and A represents a divalent aromatic radical of the formula (II): ##STR14## in which R and R 1 respectively represent independently from each other a member selected from the group consisting of a hydrogen atom and organic and organic radicals, and n represents zero or an integer of 1 to 2.
Claim 2
Dependent Claim
95 words
A gas separating material having a gas separating layer comprising at least one aromatic imide polymer which contains at least 20 molar % of at least one type of recurring unit of the formula (I): ##STR13## wherein A 1 represents a tetravalent aromatic radical and A represents a divalent aromatic radical of the formula (II): ##STR14## in which R and R 1 respectively represent independently from each other a member selected from the group consisting of a hydrogen atom and organic and organic radicals, and n represents zero or an integer of 1 to 2.
Claim 3
Dependent Claim
63 words
The gas separating material as claimed in claim 1, wherein the aromatic imide polymer contains, in addition to the recurring unit of the formula (I), 80 molar % or less of recurring units of the formula (III): ##STR15## wherein A 1 is the same as defined above, and A 2 represents a divalent aromatic radical different from A reprcsented by the formula (II).
Claim 4
Dependent Claim
27 words
The gas separating material as claimed in claim 1, wherein the divalent aromatic radical A of the formula (II) is selected from those of the formulae: ##STR16##
Claim 5
Dependent Claim
45 words
The gas separating material as claimed in claim 1 or 3, wherein the organic radicals represented by R and R 1 in the formula (II) are selected from hydrocarbon radicals having 1 to 6 carbon atoms and alkoxyl radicals having 1 to 6 carbon atoms.
Claim 6
Dependent Claim
17 words
The gas separating material as claimed in claim 1, which is in the form of a membrane.
Claim 7
Dependent Claim
18 words
The gas separating material as claimed in claim 1, which is in the form of a hollow fiber.
Claim 8
Dependent Claim
60 words
The gas separating material as claimed in claim 1, wherein the aromatic imide polymer has a logarithmic viscosity of 0.1 to 7 determined in a solution of 5 g of the polymer dissolved in 100 ml of a solvent consisting of 4 parts by volume of p-chlorophenol and 1 part by volume of o-chlorophenol at a temperature of 30° C.
Claim 9
Dependent Claim
21 words
The gas separating material as claimed in claim 1, which is useful for separating carbon dioxide gas from a gas mixture.
References Cited (Backward Citations)
US4378400A
Cited
US4528004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |