US5062902A
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US
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Fluxing agents comprising β-diketone and β-ketoimine ligands and a process for using the same
Assignee: Versum Materials US LLC
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Filing: 1990-12-27
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Granted: 1991-11-05
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Expires: 2010-12-27
Abstract
Abstract A residue-free fluxing process wherein the active fluxing agent comprises a β-diketone or β-ketoimine ligand. Such ligands react with surface metal oxides on workpieces to be soldered to form volatile metal-ligand complexes as reaction products which are sublimed from the surface leaving essentially no residue on the workpieces. The fluxing agents can be utilized in gas-phase processes wherein the workpieces are contacted with an effective amount of one or more ligands which are dispersed in a carrier gas or solvent or by incorporating the ligands into an alloy-vehicle mixture for use as conventional creams or pastes. The invention eliminates the need for post-reflow cleaning using solvents since no flux residue remains on the workpieces to be soldered following volitilization of the metal-ligand complex.
Inventors
- 👤 Thomas L. Ellison
- 👤 David A. Roberts
- 👤 John C. Ivankovits
- 👤 John A. T. Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:10
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/38; B23K35/36; B23K35/3612; B23K35/3615; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3489
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
193 words
A fluxing agent for soldering comprising an effective amount of a β-diketone or β-ketoimine ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR10## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and Y is selected from an oxygen atom; N-R 4 where R 4 is selected from a non-fluorinated, partially fluorinated or fully fluorinated alkyl, aryl, aralkyl or hydroxyalkyl group having from 1 to about 10 carbon atoms; or Y is ##STR11## wherein R 5 , R 6 and R 7 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms and R 8 is a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkylene, alkenylene, phenylene, alkylphenylene or hydroxyalkylene group having from 1 to about 8 carbon atoms.
Claim 2
Dependent Claim
193 words
A fluxing agent for soldering comprising an effective amount of a β-diketone or β-ketoimine ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR10## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and Y is selected from an oxygen atom; N-R 4 where R 4 is selected from a non-fluorinated, partially fluorinated or fully fluorinated alkyl, aryl, aralkyl or hydroxyalkyl group having from 1 to about 10 carbon atoms; or Y is ##STR11## wherein R 5 , R 6 and R 7 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms and R 8 is a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkylene, alkenylene, phenylene, alkylphenylene or hydroxyalkylene group having from 1 to about 8 carbon atoms.
Claim 3
Dependent Claim
19 words
The fluxing agent according to claim 1 where the vehicle is selected from argon, nitrogen, helium and perfluorinated hydrocarbons.
Claim 4
Dependent Claim
22 words
The fluxing agent according to claim 1 wherein from 0.1% to about 2.0% of the ligand is dispersed in a solder paste.
Claim 5
Dependent Claim
13 words
The fluxing agent according to claim 1 wherein the perfluorinated hydrocarbon is perhydrophenanthrene.
Claim 6
Dependent Claim
89 words
A fluxing agent for soldering comprising an effective amount of a β-diketone ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR12## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 2 is selected from a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms.
Claim 7
Dependent Claim
89 words
A fluxing agent for soldering comprising an effective amount of a β-diketone ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR12## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 2 is selected from a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms.
Claim 8
Dependent Claim
30 words
The fluxing agent according to claim 5 wherein R 1 and R 3 are independently selected from a linear or branched alkyl group having from 1 to 4 carbon atoms.
Claim 9
Dependent Claim
19 words
The fluxing agent according to claim 5 wherein the ligand is selected from 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedione, 1,1,1-trifluoro-2,4-pentanedione, 2,2,6,6-tetramethyl-3,5-heptanedione and 1,1,1,5,5,6,6,7,7,7-decafluoro-2,4-heptanedione.
Claim 10
Dependent Claim
19 words
The fluxing agent according to claim 5 wherein from 4.6% to about 5.2% hexafluoroacetylacetone is dispersed in nitrogen gas.
Claim 11
Dependent Claim
113 words
A fluxing agent for soldering comprising an effective amount of a β-ketoimine ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR13## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 4 is selected from a non-fluorinated, partially fluorinated or fully fluorinated alkyl, aryl, aralkyl or hydroxyalkyl group having from 1 to about 10 carbon atoms.
Claim 12
Dependent Claim
113 words
A fluxing agent for soldering comprising an effective amount of a β-ketoimine ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR13## wherein: R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 4 is selected from a non-fluorinated, partially fluorinated or fully fluorinated alkyl, aryl, aralkyl or hydroxyalkyl group having from 1 to about 10 carbon atoms.
Claim 13
Dependent Claim
30 words
The fluxing agent according to claim 9 wherein R 1 and R 3 are independently selected from a linear or branched alkyl group having from 1 to 4 carbon atoms.
Claim 14
Dependent Claim
38 words
The fluxing agent according to claim 9 wherein R 1 and R 3 are independently selected from a linear or branched alkyl group having from 1 to about 4 carbon atoms of which is partially or fully fluorinated.
Claim 15
Dependent Claim
19 words
The fluxing agent according to claim 9 wherein the vehicle is selected from argon, nitrogen, helium and perfluorinated hydrocarbons.
Claim 16
Dependent Claim
18 words
The fluxing agent according to claim 9 wherein the ligand is selected from 4-(2,2,2-trifluoroethyl)imino-1,1,1,5,5,5-hexafluoro-2-pentanone, 5-(2,2,2-trifluoroethyl)imino-1,1,1,2,2,6,6,6,-octafluoro-3-hexanone, 6-(2,2,2-trifluoroethyl)imino-1,1,1,2,2,3,3,7,7,7-decafluoro-4-heptanone and 4-(phenyl)imino-1,1,1,5,5,5-hexafluoro-2-pentanone.
Claim 17
Dependent Claim
149 words
A fluxing agent for soldering comprising an effective amount of a ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR14## wherein R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, or a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 5 , R 6 and R 7 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 8 is a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkylene, alkenylene, phenylene, alkylphenylene or hydroxyalkylene group having from 1 to about 8 carbon atoms.
Claim 18
Dependent Claim
149 words
A fluxing agent for soldering comprising an effective amount of a ligand dispersed in a vehicle wherein the ligand is represented by the formula: ##STR14## wherein R 1 and R 3 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 2 is a hydrogen atom, or a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; R 5 , R 6 and R 7 are independently selected from a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkyl or alkenyl group having from 1 to about 8 carbon atoms; and R 8 is a non-fluorinated, partially fluorinated or fully fluorinated linear or branched alkylene, alkenylene, phenylene, alkylphenylene or hydroxyalkylene group having from 1 to about 8 carbon atoms.
Claim 19
Dependent Claim
30 words
The fluxing agent according to claim 14 wherein R 1 and R 3 are independently selected from a linear or branched alkyl group having from 1 to 4 carbon atoms.
Claim 20
Dependent Claim
38 words
The fluxing agent according to claim 14 wherein R 1 and R 3 are independently selected from a linear or branched alkyl group having from 1 to about 4 carbon atoms of which is partially or fully fluorinated.
Claim 21
Dependent Claim
18 words
The fluxing agent according to claim 14 wherein the ligand is selected from 1,2-di[4-imino-1,1,1,5,5,5-hexafluoro-2-pentanone]ethane, 1,2-di[5-imino-1,1,1,2,2,6,6-octafluoro-3-hexanone]ethane, 1,2-di-[6-imino-1,1,1,2,2,3,3,7,7,7-decafluoro-4-heptanone]ethane and Bis[4-methylene)imino-1,1,1,5,5,5-hexafluoro-2-pentanone]methane.
Claim 22
Dependent Claim
19 words
The fluxing agent according to claim 14 wherein the vehicle is selected from argon, nitrogen, helium and perfluorinated hydrocarbons.
References Cited (Backward Citations)
US2801196A
Cited
US3301688A
Cited
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