US5219488A
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Azeotrope-like compositions of 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and ethanol or isopropanol
Assignee: Honeywell International Inc
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Filing: 1992-03-16
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Granted: 1993-06-15
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Expires: 2012-03-16
Abstract
Abstract Azeotrope-like compositions comprising 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and ethanol or isopropanol 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
- 👤 Ellen L. Swan
- 👤 Richard M. Hollister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:07
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; D; D06; D06L; D06L1/00; D06L1/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
58 words
Azeotrope-like compositions consisting essentially of from about 64 to about 99.5 weight percent of 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 0.5 to about 36 weight percent of ethanol and from 0 to about 1 weight percent nitromethane, which boil at about 36.5° C.± 1° C. at 760 mm Hg, wherein the azeotrope-like components consist of said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane, ethanol and nitromethan.
Claim 2
Dependent Claim
58 words
Azeotrope-like compositions consisting essentially of from about 64 to about 99.5 weight percent of 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 0.5 to about 36 weight percent of ethanol and from 0 to about 1 weight percent nitromethane, which boil at about 36.5° C.± 1° C. at 760 mm Hg, wherein the azeotrope-like components consist of said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane, ethanol and nitromethan.
Claim 3
Dependent Claim
53 words
The azeotrope-like compositions of claim 1 consisting essentially of from about 79.5 to about 99.5 weight percent said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 1 to about 20.5 weight percent said ethanol and from about 0 to about 0.5 weight percent said nitromethane wherein said compositions boil at about 36.5° C. at 760 mm Hg.
Claim 4
Dependent Claim
52 words
The azeotrope-like compositions of claim 1 consisting essentially of from 84.6 to about 98.5 weight percent said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 1.5 to about 15.4 weight percent said ethanol and from about 0 to about 0.4 weight percent said nitromethane wherein said compositions boil at about 36.5° C. at 760 mm Hg.
Claim 5
Dependent Claim
59 words
Azeotrope-like compositions consisting essentially of from about 71.5 to about 99.5 weight percent of 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 0.5 to about 28.5 weight percent of isopropanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg; wherein the azeotrope components consist of said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane, isopropanol and nitromethane.
Claim 6
Dependent Claim
59 words
Azeotrope-like compositions consisting essentially of from about 71.5 to about 99.5 weight percent of 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 0.5 to about 28.5 weight percent of isopropanol and from about 0 to about 1 weight percent nitromethane wherein said compositions boil at about 38.1° C. at 760 mm Hg; wherein the azeotrope components consist of said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane, isopropanol and nitromethane.
Claim 7
Dependent Claim
52 words
The azeotrope-like compositions of claim 4 consisting essentially of from 78.3 to about 99 weight percent said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 1 to about 21.7 weight percent said isopropanol 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 8
Dependent Claim
52 words
The azeotrope-like compositions of claim 4 consisting essentially of from 82.9 to about 98.6 weight percent said 2-trifluoromethyl-1,1,1,2-tetrafluorobutane and from about 1.4 to about 17.1 weight percent said ethanol 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 9
Dependent Claim
44 words
The azeotrope-like compositions of claim 1 wherein contain an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions, reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 10
Dependent Claim
43 words
The azeotrope-like compositions of claim 2 wherein an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions, reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 11
Dependent Claim
43 words
The azeotrope-like compositions of claim 3 wherein an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 12
Dependent Claim
43 words
The azeotrope-like compositions of claim 4 wherein an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions, reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 13
Dependent Claim
43 words
The azeotrope-like compositions of claim 5 wherein an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions, reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 14
Dependent Claim
43 words
The azeotrope-like compositions of claim 6 wherein an inhibitor is present in an amount sufficient to accomplish at least one of the following: inhibiting decomposition of the azeotrope-like compositions, reacting with undesireable decomposition products of the compositions and preventing corrosion of metal surfaces.
Claim 15
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 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 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 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.
Claim 21
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 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 22
Dependent Claim
23 words
The azeotrope-like compositions of claim 7 wherein said inhibitor is selected from the group consisting of 1,2-epoxyalkanes having 2 to 7 carbon atoms.
Claim 23
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 24
Dependent Claim
23 words
The azeotrope-like compositions of claim 10 wherein said inhibitor is selected from the group consisting of 1,2-epoxyalkanes having 2 to 7 carbon atoms.
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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 |