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US4816175A
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Azeotrope-like compositions of dichlorotrifluoroethane, methanol, cyclopentane and nitromethane
Assignee: Honeywell International Inc
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Filing: 1988-04-25
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Granted: 1989-03-28
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Expires: 2008-04-25
Abstract
Abstract Azeotrope-like compositions comprising dichlorotrifluoroethane, methanol, cyclopentane and 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.
Inventors
- 👤 Earl A. E. Lund
- 👤 Rajat S. Basu
- 👤 David P. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:18
CPC Classifications
C; C09; C09D; C09D9/00; C09D9/005; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5072; C11D7/509
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
61 words
Azeotrope-like compositions consisting essentially of dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, methanol, cyclopentane and nitromethane wherein the composition with 2,2-dichloro-1,1,1-trifluoroethane has a boiling point of about 27.2° C.±1° C. at about 760 mm Hg±25 mm Hg and the composition with 1,2-dichloro-1,1,2-trifluoroethane has a boiling point of about 28.9° C.±1° C. at about 760 mm Hg±25 mm Hg.
Claim 2
Dependent Claim
61 words
Azeotrope-like compositions consisting essentially of dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, methanol, cyclopentane and nitromethane wherein the composition with 2,2-dichloro-1,1,1-trifluoroethane has a boiling point of about 27.2° C.±1° C. at about 760 mm Hg±25 mm Hg and the composition with 1,2-dichloro-1,1,2-trifluoroethane has a boiling point of about 28.9° C.±1° C. at about 760 mm Hg±25 mm Hg.
Claim 3
Dependent Claim
13 words
Azeotrope-like compositions according to claim 1 in which the dichlorotrifluoroethane component is 2,2-dichloro-1,1,1-trifluoroethane.
Claim 4
Dependent Claim
13 words
Azeotrope-like compositions according to claim 1 in which the dichlorotrifluoroethane component is 1,2-dichloro-1,1,2-trifluoroethane.
Claim 5
Dependent Claim
51 words
Azeotrope-like compositions consisting essentially of from about 92.8 to about 98.1 weight percent dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, from about 1.2 to about 2.8 weight percent methanol, from about 0.5 to about 5.0 weight percent cyclopentane and from about 0.01 to about 0.2 weight percent nitromethane.
Claim 6
Dependent Claim
51 words
Azeotrope-like compositions consisting essentially of from about 92.8 to about 98.1 weight percent dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, from about 1.2 to about 2.8 weight percent methanol, from about 0.5 to about 5.0 weight percent cyclopentane and from about 0.01 to about 0.2 weight percent nitromethane.
Claim 7
Dependent Claim
55 words
Azeotrope-like compositions according to claim 4 consisting essentially of from about 93.5 to about 98.1 weight percent dichlorotrifluoroethane selected from the group consisting of 2,2-dichloro-1,1,1-trifluoroethane and 1,2-dichloro-1,1,2-trifluoroethane, from about 1.2 to about 1.8 weight percent methanol, from about 0.7 to about 4.7 weight percent cyclopentane and from about 0.01 to about 0.1 weight percent nitromethane.
Claim 8
Dependent Claim
30 words
Azeotrope-like compositions according to claim 5 consisting essentially of about 98.1 weight percent 2,2-dichloro-1,1,2-trifluoroethane, about 1.2 weight percent methanol, about 0.7 weight percent cyclopentane and about 0.01 weight percent nitromethane.
Claim 9
Dependent Claim
41 words
Azeotrope-like compositions according to claim 5 comprising from about 93.5 to about 95.2 weight percent 1,2-dichloro-1,1,2-trifluoroethane, from about 1.7 to about 1.8 weight percent methanol, from about 3.1 to about 4.7 weight percent cyclopentane and from about 0.1 weight percent nitromethane.
Claim 10
Dependent Claim
20 words
Azeotrope-like compositions according to claim 2 which boil at about 27.2° C.±0.6° C. at about 760 mg Hg±25 mm Hg.
Claim 11
Dependent Claim
20 words
Azeotrope-like compositions according to claim 3 which boil at about 28.9° C.±0.6° C. at about 760 mg Hg±25 mm Hg.
Claim 12
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 1.
Claim 13
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 2.
Claim 14
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 3.
Claim 15
Dependent Claim
21 words
The method of cleaning a solid surface which comprises treating said surface with an azeotrope-like composition as defined in claim 4.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |