US5219490A
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US
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Azeotrope-like compositions of 1,1,2,3,3-pentafluoropropane
Assignee: Honeywell International Inc
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Filing: 1992-04-27
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Granted: 1993-06-15
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Expires: 2012-04-27
Abstract
Abstract Azeotrope like compositions comprising 1,1,2,3,3,-pentafluoropropane and methanol or ethanol and optionally nitromethane are stable and have utility as degreasing agents and as solvents in a variety of industrial cleaning applications including cold cleaning and defluxing of printed circuit boards and dry cleaning.
Inventors
- 👤 Rajat S. Basu
- 👤 Peter B. Logsdon
- 👤 Leonard M. Stachura
- 👤 Earl A. E. Lund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:20
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02803; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
Azeotrope--like compositions consisting essentially of from about 89 to about 99.5 weight percent of 1,1,2,3,3,-pentafluoropropane and from about 0.5 to about 11 weight percent of methanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg.
Claim 2
Dependent Claim
48 words
Azeotrope--like compositions consisting essentially of from about 89 to about 99.5 weight percent of 1,1,2,3,3,-pentafluoropropane and from about 0.5 to about 11 weight percent of methanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg.
Claim 3
Dependent Claim
53 words
The azeotrope-like compositions of claim 1 consisting essentially of from about 90 to about 98.2 weight percent said 1,1,2,3,3-pentafluoropropane and from about 1.8 to about 10 weight percent said methanol and from about 0 to about 0.5 weight percent said nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg.
Claim 4
Dependent Claim
53 words
The azeotrope-like compositions of claim 1 consisting essentially of from about 90.6 to about 97.6 weight percent said 1,1,2,3,3-pentafluoropropane and from about 2.4 to about 9.4 weight percent said methanol and from about 0 to about 0.4 weight percent said nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg.
Claim 5
Dependent Claim
48 words
Azeotrope-like compositions consisting essentially of from about 97 to about 99.99 weight percent of 1,1,2,3,3-pentafluoropropane and from about 0.01 to about 3 weight percent of ethanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 8.5° C. at 760 mm Hg.
Claim 6
Dependent Claim
48 words
Azeotrope-like compositions consisting essentially of from about 97 to about 99.99 weight percent of 1,1,2,3,3-pentafluoropropane and from about 0.01 to about 3 weight percent of ethanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 8.5° C. at 760 mm Hg.
Claim 7
Dependent Claim
53 words
The azeotrope-like compositions of claim 4 consisting essentially of from about 98.5 to about 9.99 weight percent said 1,1,2,3,3-pentafluoropropane and from about 0.01 to about 1.5 weight percent said ethanol and from about 0 to about 0.5 weight percent said nitromethane wherein said compositions boil at about 38.5° C. at 760 mm Hg.
Claim 8
Dependent Claim
53 words
The azeotrope-like compositions of claim 4 consisting essentially of from about 98.8 to about 99.99 weight percent said 1,1,2,3,3-pentafluoropropane and from about 0.01 to about 1.2 weight percent said ethanol and from about 0 to about 0.4 weight percent said nitromethane wherein said compositions boil at about 38.5° C. at 760 mm Hg.
Claim 9
Dependent Claim
45 words
The azeotrope-like compositions of claim 1 wherein an effective amount of an inhibitor is present in said compositions to accomplish at least one of the following: inhibit decomposition of the compositions, react with undesirable decomposition products of the compositions, and prevent corrosion of metal surfaces.
Claim 10
Dependent Claim
67 words
The azeotrope-like composition of claim 7 wherein said inhibitor is selected from the group consisting of alkanols having 4 to 7 carbon atoms, nitroalkanes having 2 to 3 carbon atoms, phosphite esters having 12 to 30 carbon atoms, ethers having 3 or 4 carbon atoms, acetals having 4 to 7 carbon atoms, ketones having 3 to 5 carbon atoms, and amines having 6 to 8 carbon atoms.
Claim 11
Dependent Claim
23 words
The azeotrope-like compositions of claim 7 wherein said inhibitor is selected from the group consisting of 1,2-expoyalkanes having 2 to 7 carbon atoms.
Claim 12
Dependent Claim
45 words
The azeotrope-like compositions of claim 4 wherein an effective amount of an inhibitor is present in said compositions to accomplish at least one of the following: inhibit decomposition of the compositions, react with undesirable decomposition products of the compositions, and prevent corrosion of metal surfaces.
Claim 13
Dependent Claim
67 words
The azeotrope-like composition of claim 10 wherein said inhibitor is selected from the group consisting of alkanols having 4 to 7 carbon atoms, nitroalkanes having 2 to 3 carbon atoms, phosphite esters having 12 to 30 carbon atoms, ethers having 3 to 4 carbon atoms, acetals having 4 to 7 carbon atoms, ketones having 3 to 5 carbon atoms, and amines having 6 to 8 carbon atoms.
Claim 14
Dependent Claim
23 words
The azeotrope-like compositions of claim 10 wherein said inhibitor is selected from the group comsisting of 1,2-epoxyalkanes having 2 to 7 carbon atoms.
Claim 15
Dependent Claim
33 words
A method of dissolving contaminants or removing contaminants from the surface of a substrate which comprise the step of: treating said surface of substrate with said azeotrope-like composition of claim 1 as solvent.
Claim 16
Dependent Claim
34 words
A method of dissolving contaminants or removing contaminants from the surface of a substrate which comprises the step of: treating said surface of said substrate with said azeotrope-like composition of claim 2 as solvent.
Claim 17
Dependent Claim
34 words
A method of dissolving contaminants or removing contaminants from the surface of a substrate which comprises the step of: treating said surface of said substrate with said azeotrope-like composition of claim 3 as solvent.
Claim 18
Dependent Claim
34 words
A method of dissovling contaminants or removing contaminants form the surface of a substrate which comprises the step of: treating said surface of said substrate with said azeotrope-like composition of claim 4 as solvent.
Claim 19
Dependent Claim
34 words
A method of dissolving contaminants or removing contaminants from the surface of a substrate which comprises the step of: treating said surface of said substrate with said azeotrope-like composition of claim 5 as solvent.
Claim 20
Dependent Claim
34 words
A method of dissolving contaminants or removing contaminants from the surface of a substrate which comprises the step of: treating said surface of said substrate with said azeotrope-like composition of claim 6 as solvent.
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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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |