US4936923A
Expired / Lapsed
US
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Azeotropic compositions of 1,1,2-trichlorotrifluoroethane with cis-1,2-dichloroethylene and n-propanol or isopropanol with or without nitromethane
Assignee: EIDP Inc
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Filing: 1989-03-01
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Granted: 1990-06-26
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Expires: 2009-03-01
Abstract
Abstract Azeotropic mixture of 1,1,2-trichlorotrifluoroethane (CFC-113) with cis-1,2-dichloroethylene and n-propanol or isopropanol with or without nitromethane, the azeotropic mixtures being useful in solvent cleaning applications. One azeotrope-like "mixture contains about 88-96 weight percent 1,1,2-trichlorotrifluoroethane, about 4-10 weight percent cis-1,2-dichloroethylene and about 0.1-2.0 weight percent n-propanol and boils at about 47° C. at essentially atmospheric pressure. A second azeotrope-like mixture contains about 87-97 weight percent 1,1,2-trichlorotrifluoroethane, about 2-8 weight percent cis-1,2-dichloroethylene and about 1-5 weight percent isopropanol and boils at about 45° C. at essentially atmospheric pressure. A third azeotrope-like mixture contains about 88-98 weight percent 1,2,2-trichlorotrifluoroethane, about 1-7 weight percent cis-1,2-dichloroethylene, about 1-5 weight percent isopropanol and about 0.1-2.0 weight percent nitromethane.
Inventors
- 👤 Abid N. Merchant
- 👤 Robert A. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:55
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
An azeotrope or azeotrope-like composition consisting essentially of about 88-96 weight percent 1,1,2-trichlorotrifluoroethane, about 4-10 weight percent cis-1,2-dichloroethylene and about 0.1-2.0 weight percent n-propanol, having a boiling point of about 47° C., at substantially atmospheric pressure.
Claim 2
Dependent Claim
36 words
An azeotrope or azeotrope-like composition consisting essentially of about 88-96 weight percent 1,1,2-trichlorotrifluoroethane, about 4-10 weight percent cis-1,2-dichloroethylene and about 0.1-2.0 weight percent n-propanol, having a boiling point of about 47° C., at substantially atmospheric pressure.
Claim 3
Dependent Claim
29 words
The azeotrope or azeotrope-like composition of claim 1, wherein the composition is about 91.8 weight percent 1,1,2-trichlorotrifluoroethane, and about 7.1 weight percent cis-1,2-dichloroethylene and about 1.1 weight percent n-propanol.
Claim 4
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surface with the azeotrope or azeotrope-like compositions of claim 1.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.
Claim 6
Dependent Claim
12 words
The process of claim 3, wherein the solid surface is a metal.
Claim 7
Dependent Claim
36 words
An azeotrope or azeotrope-like composition consisting essentially of about 87-97 weight percent 1,1,2-trichlorotrifluoroethane, about 2-8 weight percent cis-1,2-dichloroethylene and about 1-5 weight percent isopropanol, having a boiling point of about 46° C., at substantially atmospheric pressure.
Claim 8
Dependent Claim
36 words
An azeotrope or azeotrope-like composition consisting essentially of about 87-97 weight percent 1,1,2-trichlorotrifluoroethane, about 2-8 weight percent cis-1,2-dichloroethylene and about 1-5 weight percent isopropanol, having a boiling point of about 46° C., at substantially atmospheric pressure.
Claim 9
Dependent Claim
29 words
The azeotrope or azeotrope-like composition of claim 6, wherein the composition is about 92.3 weight percent 1,1,2-trichlorotrifluoroethane, and about 5.0 weight percent cis-1,2-dichloroethylene and about 2.7 weight percent isopropanol.
Claim 10
Dependent Claim
41 words
An azeotrope or azeotrope-like composition consisting essentially of about 93.1 weight percent 1,1,2-trichlorotrifluoroethane, about 3.6 weight percent cis-1,2-dichloroethylene, about 2.5 weight percent isopropanol and about 0.8 weight percent nitromethane, having a boiling point of about 46° C., at substantially atmospheric pressure.
Claim 11
Dependent Claim
41 words
An azeotrope or azeotrope-like composition consisting essentially of about 93.1 weight percent 1,1,2-trichlorotrifluoroethane, about 3.6 weight percent cis-1,2-dichloroethylene, about 2.5 weight percent isopropanol and about 0.8 weight percent nitromethane, having a boiling point of about 46° C., at substantially atmospheric pressure.
Claim 12
Dependent Claim
21 words
A process for cleaning a solid surface which comprises treating said surface with the azeotrope or azeotrope-like compositions of claim 8.
Claim 13
Dependent Claim
19 words
The process of claim 9, wherein the solid surface is a printed circuit board contaminated with flux and flux-residues.
Claim 14
Dependent Claim
12 words
The process of claim 9, wherein the solid surface is a metal.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |