US4303558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning composition comprising 1,1,2-trichloro-1,2,2-trifluoroethane and an alcohol
Assignee: Imperial Chemical Industries Ltd
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Filing: 1979-09-04
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Granted: 1981-12-01
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Expires: 1999-09-04
Abstract
Abstract An improved cleaning composition for removal of flux from printed circuit boards consists essentially of the azeotropic mixture of 1,1,2-trichloro-1,2,2-trifluoroethane and a lower aliphatic alcohol and containing as additive an N-substituted or N,N-disubstituted amide of an aliphatic carboxylic acid wherein there is at least one hydroxyalkyl or hydroxyalkenyl substituent of up to 8 carbon atoms attached to the amide nitrogen atom.
Inventors
- 👤 David G. Hey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:08
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5081; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02809; C23G5/02812; C23G5/02816; C23G5/02819
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
A cleaning composition comprising the approximate azeotropic mixture of 1,1,2-trichloro-1,2,2-trifluoroethane and a lower aliphatic alcohol and containing a cleaning-improving amount of an N-substituted or N,N-disubstituted amide of an aliphatic carboxylic acid wherein there is at least one hydroxyalkyl or hydroxyalkenyl substituent of up to 8 carbon atoms attached to the amide nitrogen atom.
Claim 2
Dependent Claim
53 words
A cleaning composition comprising the approximate azeotropic mixture of 1,1,2-trichloro-1,2,2-trifluoroethane and a lower aliphatic alcohol and containing a cleaning-improving amount of an N-substituted or N,N-disubstituted amide of an aliphatic carboxylic acid wherein there is at least one hydroxyalkyl or hydroxyalkenyl substituent of up to 8 carbon atoms attached to the amide nitrogen atom.
Claim 3
Dependent Claim
102 words
A composition as claimed in claim 1 in which the N-substituted or N,N-disubstituted amide is of formula R--CO--NXY where X is a hydroxyalkyl group having 1 to 8 carbon atoms or hydroxyalkenyl group having 2 to 8 carbon atoms, Y is a hydroxyalkyl group having 1 to 8 carbon atoms or a hydroxyalkenyl group having 2 to 8 carbon atoms, hydrogen, an alkyl group having 1 to 8 carbon atoms or an alkylene group having 2 to 8 carbon atoms and R is an alkyl group having 1 to 23 carbon atoms or an alkylene group having 2 to 23 carbon atoms.
Claim 4
Dependent Claim
44 words
A composition as claimed in claim 1 or claim 2 in which the alkyl chain of the hydroxyalkyl group and the alkylene chain of the hydroxyalkenyl group in the substituted amide contains 1 to 5 carbon atoms and 2 to 5 carbon atoms, respectively.
Claim 5
Dependent Claim
38 words
A composition as claimed in claim 1 or claim 2 in which a hydroxy substituent is attached to a terminal carbon atom of the alkyl or alkylene chain of the hydroxyalkyl or hydroxyalkenyl group of the substituted amide.
Claim 6
Dependent Claim
19 words
A composition as claimed in claim 1 or claim 2 in which X and/or Y is a hydroxyalkyl group.
Claim 7
Dependent Claim
19 words
A composition as claimed in claim 1 or claim 2 in which the hydroxyalkyl group is a 2-hydroxyethyl group.
Claim 8
Dependent Claim
25 words
A composition as claimed in claim 1 or claim 2 in which the group R of the substituted amide contains 6 to 17 carbon atoms.
Claim 9
Dependent Claim
35 words
A composition as claimed in claim 1 or claim 2 in which there is employed a mixture of N,N-disubstituted amides the main component of which is one wherein the group R contains 11 carbon atoms.
Claim 10
Dependent Claim
33 words
A composition as claimed in claim 8 wherein the main component is N,N-di-(2-hydroxyalkyl)lauramide and wherein there may also be present amides in which the group R contains from 6 to 18 carbon atoms.
Claim 11
Dependent Claim
20 words
A composition as claimed in claim 1 or claim 2 wherein the additive boils at a temperature above 200° C.
Claim 12
Dependent Claim
31 words
A composition as claimed in claim 1 or claim 2 in which the additive is present in proportions of 0.01% to 3% by weight with reference to the total cleaning composition.
Claim 13
Dependent Claim
18 words
A composition as claimed in claim 1 or claim 2 which also contains a benzotriazole or a benzimidazole.
Claim 14
Dependent Claim
22 words
A method of cleaning articles by bringing them into contact with a cleaning composition as described in claim 1 or claim 2.
References Cited (Backward Citations)
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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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |