US4370254A
Expired / Lapsed
US
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Use of perfluoroalkane sulphonamide salts as surface active agents
Assignee: Bayer AG
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Filing: 1980-05-12
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Granted: 1983-01-25
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Expires: 2000-05-12
Abstract
Abstract Employing as surface active agents salts of perfluoroalkane sulphonamides, preferably of the formula ##STR1## in which R F is a perfluorinated aliphatic group having 4 to 20 C-atoms, R is a hydrogen atoms, an alkyl group having 1 to 4 C-atoms, a hydroxyalkyl group having 1 to 4 C-atoms or a cycloalkyl group having up to 6 C-atoms, and M is an alkali metal, an alkaline earth metal or an onium group of the formula [ZR.sub.2 R.sub.3 R.sub.4 R.sub.5 ].sup.⊕, Z is phosphorus or nitrogen, and R 2 to R 5 each independently is a hydrogen atom, or an alkyl, hydroxyalkyl, or alkoxyalkyl group having 1 to 4 C-atoms per alkyl moiety.
Inventors
- 👤 Karl-Heinz Mitschke
- 👤 Hans Niederprum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/38; G03C1/385; C; C09; C09K; C09K23/00; C09K23/26; C11; C11D; C11D1/00; C11D1/004; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
34 words
In the lowering of the surface tension of an aqueous solution by adding thereto a surface active agent, the improvement which comprises employing as the surface active agent a salt of a perfluoroalkane sulphonamide.
Claim 2
Dependent Claim
34 words
In the lowering of the surface tension of an aqueous solution by adding thereto a surface active agent, the improvement which comprises employing as the surface active agent a salt of a perfluoroalkane sulphonamide.
Claim 3
Dependent Claim
112 words
The process according to claim 1, wherein the salt is of the formula ##STR3## in which R F is a perfluorinated aliphatic group having 4 to 20 C-atoms, R is a hydrogen atom, an alkyl group having 1 to 4 C-atoms, a hydroxyalkyl group having 1 to 4 C-atoms or a cycloalkyl group having up to 6 C-atoms, and M is an alkali metal, an alkaline earth metal or an onium group of the formula [ZR.sub.2 R.sub.3 R.sub.4 R.sub.5 ].sup.⊕, Z is phosphorus or nitrogen, and R 2 to R 5 each independently is a hydrogen atom, or an alkyl, hydroxyalkyl, or alkoxyalkyl group having 1 to 4 C-atoms. per alkyl moiety.
Claim 4
Dependent Claim
19 words
The process according to claim 2, in which R F is an alkyl group having 8 to 20 C-atoms.
Claim 5
Dependent Claim
17 words
The process according to claim 2, in which M is an onium group, and Z is nitrogen.
Claim 6
Dependent Claim
35 words
The process according to claim 4, in which R is an alkyl group having 1 to 4 C-atoms, a hydroxyalkyl group having 1 to 4 C-atoms or a cycloalkyl group having up to 6 C-atoms.
References Cited (Backward Citations)
US2658916A
Cited
US2732398A
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US2915554A
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DE1275054B
Cited
FR1596922A
Cited
US4089804A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-24 | 1986-07-26 | 1987-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-24 | 1990-07-26 | 1991-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-24 | 1994-07-26 | 1995-01-25 | $7700.00 | Window Closed / Lapsed |