US4378400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas separating material
Assignee: Ube Corp
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Filing: 1981-06-29
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Granted: 1983-03-29
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Expires: 2001-06-29
Abstract
Abstract A gas separating material having excellent heat and chemical resistance, mechanical strength and gas-separating function, comprises a gas separating layer consisting of at least one dense film having a thickness of from 0.1 to 20 microns and comprising at least one aromatic imide polymer which comprises at least 80 molar % of at least one type of recurring unit of the formula (I): <IMAGE> (I) wherein R represents a divalent aromatic radical.
Inventors
- 👤 Hiroshi Makino
- 👤 Yoshihiro Kusuki
- 👤 Takashi Harada
- 👤 Hiroshi Shimazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:47
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/58; B01D71/62; B01D71/64; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31721
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
A gas separating material comprising a gas separating layer consisting essentially of at least one dense film having a thickness of from 0.1 to 20 microns, said film comprising at least one aromatic imide polymer having at least 80 molar % of at least one type of recurring unit of the formula: ##STR14## wherein R represents a divalent aromatic radical selected from the group consisting of those of the formulae (IV) and (V): ##STR15## wherein R 1 and R 2 respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom, a lower alkyl radical having 1 to 3 carbon atoms and a lower alkoxy radical having 1 to 3 carbon atoms, and A represents a divalent bond selected from the group consisting of --O--, --S--, --CO--, --SO 2 --, --SO--, --CH 2 --, and --C(CH 3 ) 2 --, and ##STR16## wherein R 1 and R 2 are as defined above, said dense film exhibiting a ratio of gas permeability coefficient of hydrogen gas to that of carbon monoxide gas (PH 2 /PCO) of more than 65 and a ratio of gas permeability coefficient of oxygen gas to that of nitrogen gas (PO 2 /PN 2 ) of from 7.0 to 20.
Claim 2
Dependent Claim
209 words
A gas separating material comprising a gas separating layer consisting essentially of at least one dense film having a thickness of from 0.1 to 20 microns, said film comprising at least one aromatic imide polymer having at least 80 molar % of at least one type of recurring unit of the formula: ##STR14## wherein R represents a divalent aromatic radical selected from the group consisting of those of the formulae (IV) and (V): ##STR15## wherein R 1 and R 2 respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom, a lower alkyl radical having 1 to 3 carbon atoms and a lower alkoxy radical having 1 to 3 carbon atoms, and A represents a divalent bond selected from the group consisting of --O--, --S--, --CO--, --SO 2 --, --SO--, --CH 2 --, and --C(CH 3 ) 2 --, and ##STR16## wherein R 1 and R 2 are as defined above, said dense film exhibiting a ratio of gas permeability coefficient of hydrogen gas to that of carbon monoxide gas (PH 2 /PCO) of more than 65 and a ratio of gas permeability coefficient of oxygen gas to that of nitrogen gas (PO 2 /PN 2 ) of from 7.0 to 20.
Claim 3
Dependent Claim
40 words
The gas separating material as claimed in claim 1, wherein the PH 2 /PCO ratio is in the range of from 70 to 200 and the PO 2 /PN 2 ratio is in the range of from 7.2 to 20.
Claim 4
Dependent Claim
25 words
The gas separating material as claimed in claim 2 wherein the PO 2 /PN 2 ratio is in the range of from 11 to 16.
Claim 5
Dependent Claim
13 words
The gas separating material as claimed in claim 1 wherein R is ##STR17##
Claim 6
Dependent Claim
40 words
The gas separating material as claimed in claim 1 wherein R is of the formula (V) wherein R 1 and R 2 represent, independently from each other, a member selected from lower alkoxy radicals having 1 to 3 carbon atoms.
References Cited (Backward Citations)
US3899309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |