US4636229A
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US
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Selective gas separation membrane
Assignee: Eneos Corp
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Filing: 1985-03-14
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Granted: 1987-01-13
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Expires: 2005-03-14
Abstract
Abstract A selective gas separation membrane comprising a fumaric diester polymer having a repeating unit represented by the following general formula (1): ##STR1## wherein X and Y are each independently an alkyl, cycloalkyl, aryl, trialkylsilylalkyl or siloxane-containing alkyl group.
Inventors
- 👤 Hiroyuki Itoh
- 👤 Ko Sakata
- 👤 Hirosuke Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:48
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/40
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
A selective gas separation membrane comprising a fumaric diester polymer having a repeating unit represented by the following general formula ( 1): ##STR14## wherein X and Y are each independently an alkyl, cycloalkyl, aryl, trialkylsilylalkyl or siloxane-containing alkyl group.
Claim 2
Dependent Claim
39 words
A selective gas separation membrane comprising a fumaric diester polymer having a repeating unit represented by the following general formula ( 1): ##STR14## wherein X and Y are each independently an alkyl, cycloalkyl, aryl, trialkylsilylalkyl or siloxane-containing alkyl group.
Claim 3
Dependent Claim
30 words
A selective gas separation membrane as set forth in claim 1, wherein the X and Y in the general formula (1) are each independently an alkyl, cycloalkyl or aryl group.
Claim 4
Dependent Claim
44 words
A selective gas separation membrane as set forth in claim 1, wherein the membrane contains at least 20 mol % of a repeating unit of the general formula (1) in which the X and Y are each independently a trialkylsilylalkyl or siloxane-containing alkyl group.
Claim 5
Dependent Claim
44 words
A selective gas separation membrane as set forth in claim 3, wherein the membrane contains at least 40 mol % of a repeating unit of the general formula (1) in which the X and Y are each independently a trialkylsilylalkyl or siloxane-containing alkyl group.
Claim 6
Dependent Claim
34 words
A selective gas separation membrane as set forth in claim 1, wherein the membrane is composed of a copolymer containing at least 20 mol % of a repeating unit of the general formula (1).
Claim 7
Dependent Claim
34 words
A selective gas separation membrane as set forth in claim 5, wherein the membrane is composed of a copolymer containing at least 50 mol % of a repeating unit of the general formula (1).
Claim 8
Dependent Claim
21 words
A selective gas separation membrane as set forth in claim 1, wherein the alkyl group has 1 to 10 carbon atoms.
Claim 9
Dependent Claim
19 words
A selective gas separation membrane as set forth in claim 7, wherein the alkyl group is iso-propyl or tert-butyl.
Claim 10
Dependent Claim
21 words
A selective gas separation membrane as set forth in claim 1, wherein the cycloalkyl group has 5 to 10 carbon atoms.
Claim 11
Dependent Claim
19 words
A selective gas separation membrane as set forth in claim 1, wherein the cycloalkyl group is cyclopentyl or cyclohexyl.
Claim 12
Dependent Claim
20 words
A selective gas separation membrane as set forth in claim 1, wherein the aryl group is phenyl or substituted phenyl.
Claim 13
Dependent Claim
20 words
A selective gas separation membrane as set forth in claim 11, wherein the aryl group is phenyl or tert-butyl phenyl.
Claim 14
Dependent Claim
63 words
A selective gas separation membrane as set forth in claim 1, wherein the trialkylsilylalkyl group is represented by the following general formula: ##STR15## wherein R is a hydrocarbon radical having 1 to 10 carbon atoms, R 1 , R 2 and R 3 are each an alkyl group having 1 to 4 carbon atoms and p is an integer of 1 to 10.
Claim 15
Dependent Claim
21 words
A selective gas separation membrane as set forth in claim 13, wherein the trialkylsilylalkyl group is trimethylsilylmethyl, 1-trimethylsilylethyl, 2-trimethylsilylpropyl or 1-methyl-3-trimethylsilylpropyl.
Claim 16
Dependent Claim
79 words
A selective gas separation membrane as set forth in claim 1, wherein the siloxane-containing alkyl group is represented by the following general formula: ##STR16## wherein R' is a divalent hydrocarbon radical having 1 to 10 carbon atoms, R 4 , R 5 , R 6 , R 7 and R 8 are each an alkyl group having 1 to 4 carbon atoms, q is an integer of 1 to 10 and r is an integer of 1 to 100.
Claim 17
Dependent Claim
43 words
A selective gas separation membrane as set forth in claim 15, wherein the R 4 , R 5 , R 6 , R 7 and R 8 in the general formula are each methyl and r is an integer of 1 to 10.
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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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |