Patent US4548769A successfully refreshed from Google Patents.
US4548769A
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Process for producing semipermeable membrane
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1985-01-30
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Granted: 1985-10-22
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Expires: 2005-01-30
Abstract
Abstract A process for producing a semipermeable membrane having a high flux, excellent in solute rejection and useful for reverse osmosis, ultrafiltration and the like which comprises dipping a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile in a solution of an amine and/or an alkali, or casting a solution of said polymer containing an amine and/or an alkali to prepare a semipermeable membrane, and optionally, treating the semipermeable membrane thus obtained with plasma.
Inventors
- 👤 Takatoshi Shimomura
- 👤 Fumio Fujita
- 👤 Manabu Hirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; B; B01; B01D; B01D71/00; B01D71/06; B01D71/40; B01D71/42; B01D71/421; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
28 words
A process for producing a semipermeable membrane which comprises dipping a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile in a solution of an amine.
Claim 2
Dependent Claim
28 words
A process for producing a semipermeable membrane which comprises dipping a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile in a solution of an amine.
Claim 3
Dependent Claim
51 words
A process for producing semipermeable membrane according to claim 1, wherein said amine is a compound represented by the following general formula: ##STR3## wherein R 1 , R 2 and R 3 represent H, C 1-18 alkyl group, phenyl group, aralkyl group or cyclohexyl group, or an alkanolamine or a hydroxylamine.
Claim 4
Dependent Claim
23 words
A process for producing semipermeable membrane according to claim 1, wherein said amine is aliphatic primary, secondary or tertiary amine, alkanolamine or hydroxylamine.
Claim 5
Dependent Claim
34 words
A process for producing a semipermeable membrane which comprises dipping a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile in a solution of an amine and thereafter treating it with plasma.
Claim 6
Dependent Claim
34 words
A process for producing a semipermeable membrane which comprises dipping a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile in a solution of an amine and thereafter treating it with plasma.
Claim 7
Dependent Claim
52 words
A process for producing a semipermeable membrane according to claim 4, wherein said amine is a compound represented by the following general formula: ##STR4## wherein R 1 , R 2 and R 3 represent H, C 1-18 alkyl group, phenyl group, aralkyl group or cyclohexyl group, or an alkanolamine or a hydroxylamine.
Claim 8
Dependent Claim
24 words
A process for producing a semipermeable membrane according to claim 4, wherein said amine is aliphatic primary, secondary or tertiary amine, alkanolamine or hydroxylamine.
Claim 9
Dependent Claim
37 words
A process for producing a semipermeable membrane which comprises, at the time of preparing a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile by wet casting process, adding an amine to the casting solution.
Claim 10
Dependent Claim
37 words
A process for producing a semipermeable membrane which comprises, at the time of preparing a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile by wet casting process, adding an amine to the casting solution.
Claim 11
Dependent Claim
87 words
A process for producing a semipermeable membrane according to claim 7, wherein said amine is a compound represented by the following general formula: ##STR5## wherein R 1 , R 2 and R 3 represent H, C 1-18 alkyl group, phenyl group, aralkyl group or cyclohexyl group, a compound represented by the following general formula: ##STR6## wherein R 1 , R 2 , R 3 and R 4 represent H, C 1-18 alkyl group, phenyl group, aralkyl group or cyclohexyl group and X represents halogen, or an alkanolamine.
Claim 12
Dependent Claim
23 words
A process for producing a semipermeable membrane according to claim 7, wherein said amine is aliphatic primary, secondary or tertiary amine or alkanolamine.
Claim 13
Dependent Claim
45 words
A process for producing a semipermeable membrane which comprises wet casting a solution containing an amine and an acrylonitrile polymer to produce a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile and then subjecting the resulting semipermeable membrane to a plasma treatment.
Claim 14
Dependent Claim
45 words
A process for producing a semipermeable membrane which comprises wet casting a solution containing an amine and an acrylonitrile polymer to produce a semipermeable membrane of acrylonitrile polymer containing 40-100% by mole of acrylonitrile and then subjecting the resulting semipermeable membrane to a plasma treatment.
Claim 15
Dependent Claim
49 words
A process for producing a semipermeable membrane according to claim 10, wherein said amine is a compound represented by the following general formula: ##STR7## wherein R 1 , R 2 and R 3 represent H, C 1-18 alkyl group, phenyl group, aralkyl group or cyclohexyl group, or an alkanolamine.
Claim 16
Dependent Claim
23 words
A process for producing a semipermeable membrane according to claim 10, wherein said amine is aliphatic primary, secondary or tertiary amine or alkanolamine.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |