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US5494601A
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Azeotropic compositions
Assignee: 3M Co
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Filing: 1993-04-01
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Granted: 1996-02-27
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Expires: 2013-04-01
Abstract
Abstract Azeotropic compositions include a perfluorinated alkane or alkene and an organic solvent.
Inventors
- 👤 Richard M. Flynn
- 👤 Daniel R. Vitcak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:07
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C11D7/5036; C11D7/5068; C11D7/5095; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
An azeotropic composition consisting essentially of: (A) 81 to 99 weight percent of an acyclic perfluorinated alkane selected from the group consisting of perfluorohexane and perfluoropentane; and (B) 1 to 19 weight percent of an acyclic ether solvent, which solvent is t-amyl methyl ether if the acyclic perfluorinated alkane is perfluorohexane, and t-butyl methyl ether if the perfluorinated acyclic alkane is perfluoropentane; such that the composition, when fractionally distilled, will yield a distillate fraction that is an azeotrope, the azeotrope: (i) consisting essentially of 90 weight percent acyclic perfluorinated alkane and 10 weight percent acyclic ether; and (ii) having a boiling point of 53° C. at ambient pressure, when the acyclic perfluorinated alkane is perfluorohexane, or, when the acyclic perfluorinated alkane is perfluoropentane, a boiling point of 25° C. at ambient pressure.
Claim 2
Dependent Claim
132 words
An azeotropic composition consisting essentially of: (A) 81 to 99 weight percent of an acyclic perfluorinated alkane selected from the group consisting of perfluorohexane and perfluoropentane; and (B) 1 to 19 weight percent of an acyclic ether solvent, which solvent is t-amyl methyl ether if the acyclic perfluorinated alkane is perfluorohexane, and t-butyl methyl ether if the perfluorinated acyclic alkane is perfluoropentane; such that the composition, when fractionally distilled, will yield a distillate fraction that is an azeotrope, the azeotrope: (i) consisting essentially of 90 weight percent acyclic perfluorinated alkane and 10 weight percent acyclic ether; and (ii) having a boiling point of 53° C. at ambient pressure, when the acyclic perfluorinated alkane is perfluorohexane, or, when the acyclic perfluorinated alkane is perfluoropentane, a boiling point of 25° C. at ambient pressure.
Claim 3
Dependent Claim
36 words
An azeotropic composition according to claim 1, wherein the composition consists essentially of: (A) 85 to 95 weight percent of an acyclic perfluorinated alkane, and (B) 5 to 15 weight percent of an acyclic ether solvent.
Claim 4
Dependent Claim
101 words
An azeotropic composition according to claim 1 which is an azeotrope and consists essentially of 90 wt. % of acyclic perfluorinated alkane and 10 wt. % of acyclic ether, wherein the acyclic perfluorinated alkane is selected from the group consisting of perfluorohexane and perfluoropentane, and the acyclic ether is t-amyl methyl ether if the acyclic perfluorinated alkane is perfluorohexane, and is t-butyl methyl ether if the acyclic perfluorinated alkane is perfluoropentane, and which composition boils at 53° C. at ambient pressure where the acyclic perfluorinated alkane is perfluorohexane and 25° C. at ambient pressure where the acyclic perfluorinated alkane is perfluoropentane.
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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) | 1999-02-26 | 1999-08-28 | 2000-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-26 | 2003-08-28 | 2004-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-26 | 2007-08-28 | 2008-02-27 | $7700.00 | Window Closed / Lapsed |