US4803009A
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Stabilized azeotrope or azeotrope-like composition of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol and 1,2-dichloroethylene
Assignee: EIDP Inc
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Filing: 1988-02-02
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Granted: 1989-02-07
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Expires: 2008-02-02
Abstract
Abstract A stabilized azeotrope or azeotrope-like composition is disclosed comprising an azeotrope or azeotrope-like composition of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol and 1,2-dichloroethylene and about 0.001 to 0.004 wt. percent of a lower alkoxyphenol, about 0.01 to 1.0 wt. percent 1,2-butylene oxide, about 0.01 to 1.0 wt. percent diisopropylamine and at least one of about 0.01 to 1.0 wt. percent nitromethane and about 0.01 to 1.0 wt. percent 1,2-propylene oxide, said wt. percents based on the weight of the azeotrope or azeotrope-like composition.
Inventors
- 👤 Robert A. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:48
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
52 words
A stabilized azeotrope or azeotrope-like composition comprising a mixture of about 64 to 72 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 5 to 7 weight percent methanol and about 23 to 29 weight percent trans-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide, diisopropylamine and at least one of nitromethane and 1,2-propylene oxide.
Claim 2
Dependent Claim
52 words
A stabilized azeotrope or azeotrope-like composition comprising a mixture of about 64 to 72 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 5 to 7 weight percent methanol and about 23 to 29 weight percent trans-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide, diisopropylamine and at least one of nitromethane and 1,2-propylene oxide.
Claim 3
Dependent Claim
73 words
The stabilized azeotrope or azeotrope-like composition of claim 1 wherein the effective stabilizing amounts are about 0.001 to 0.004 wt. percent of a lower alkoxyphenol, about 0.01 to 1.0 wt. percent 1,2-butylene oxide, about 0.01 to 1.0 wt. percent diisopropylamine and at least one of about 0.01 to 1.0 wt. percent nitromethane and about 0.01 to 1.0 wt. percent 1,2-propylene oxide, said wt. percents based on the weight of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol and trans-1,2-dichloroethylene.
Claim 4
Dependent Claim
17 words
The stabilized azeotrope or azeotrope-like composition of claim 2 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 5
Dependent Claim
15 words
The stabilized azeotrope or azeotrope-like composition of claim 3 wherein the lower alkoxyphenol is 4-methoxyphenol.
Claim 6
Dependent Claim
29 words
The stabilized azeotrope or azeotrope-like composition of claim 1 wherein the effective amounts are about 69 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol, about 25 weight percent trans-1,2-dichloroethylene.
Claim 7
Dependent Claim
17 words
The stabilized azeotrope or azeotrope-like composition of claim 5 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 8
Dependent Claim
15 words
The stabilized azeotrope or azeotrope-like composition of claim 6 wherein the lower alkoxyphenol is 4-methoxyphenol.
Claim 9
Dependent Claim
56 words
The composition of claim 2 wherein the effective stabilizing amounts are about 0.0026 weight percent 4-methoxyphenol, about 0.026 weight percent 1,2-butylene oxide, about 0.1 weight percent diisopropylamine and at least one of about 0.2 weight percent nitromethane and about 0.1 weight percent 1,2-propylene oxide, said wt. percents based on the weight of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol and trans-1,2-dichloroethylene.
Claim 10
Dependent Claim
17 words
The stabilized azeotrope or azeotrope-like composition of claim 8 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 11
Dependent Claim
56 words
The composition of claim 5 wherein the effective stabilizing amounts are about 0.0026 weight percent 4-methoxyphenol, about 0.026 weight percent 1,2-butylene oxide, about 0.1 weight percent diisopropylamine and at least one of about 0.2 weight percent nitromethane and about 0.1 weight percent 1,2-propylene oxide, said wt. percents based on the weight of 1,1,2-trichloro-1,2,2-trifluoroethane, methanol and trans-1,2-dichloroethylene.
Claim 12
Dependent Claim
17 words
The stabilized azeotrope or azeotrope-like composition of claim 10 wherein both nitromethane and 1,2-propylene oxide are present.
Claim 13
Dependent Claim
18 words
A process for cleaning a solid surface which comprises treating said surface with the composition of claim 1.
Claim 14
Dependent Claim
20 words
The process of claim 12 wherein the solid surface is a printed circuit board contaminated with flux and flux residues.
Claim 15
Dependent Claim
43 words
A stabilized azeotrope or azeotrope-like composition comprising about 93 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol and about 1 weight percent cis-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide, diisopropylamine and at least one of nitromethane and 1,2-propylene oxide.
Claim 16
Dependent Claim
43 words
A stabilized azeotrope or azeotrope-like composition comprising about 93 weight percent 1,1,2-trichloro-1,2,2-trifluoroethane, about 6 weight percent methanol and about 1 weight percent cis-1,2-dichloroethylene and effective stabilizing amounts of a lower alkoxyphenol, 1,2-butylene oxide, diisopropylamine and at least one of nitromethane and 1,2-propylene oxide.
Claim 17
Dependent Claim
18 words
A process for cleaning a solid surface which comprises treating said surface with the composition of claim 14.
Claim 18
Dependent Claim
20 words
The process of claim 15 wherein the solid surface is a printed circuit board contaminated with flux and flux residues.
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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
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