Compositions – Electrically conductive or emissive compositions – Free metal containing
Patent
1986-01-22
1987-06-16
Barr, Josephine L.
Compositions
Electrically conductive or emissive compositions
Free metal containing
252514, 252500, A01B 106
Patent
active
046735321
ABSTRACT:
A solder composition or solder cream especially adapted for vapor phase soldering in electronic circuits without formation of organic residues, comprises a major portion of finely divided solder metal and a minor portion of a fluorinated tertiary alkylamine. Preferably, the composition consists essentially of 85 to 90% of solder metal and 10 to 15% of perfluorotrihexyl amine. A small amount of an organic brominated activator such as homocyclohexane, can be added to convert any lead oxide or tin oxide present in the solder metal, to the corresponding bromides, and a small amount of solvent can be incorporated to disperse the activator in the solder composition. The fluorinated amine vehicle of the solder cream is compatible with and dissolves in the perfluorotriamyl amine, commonly used as the heating medium in vapor phase soldering, and the amine vehicle, perfluorotrihexyl amine, can be recovered from the solution by distillation, for reuse.
REFERENCES:
patent: 4391742 (1983-07-01), Steigerwald et al.
patent: 4535012 (1985-08-01), Martin et al.
patent: 4595604 (1986-06-01), Martin et al.
patent: 4595605 (1986-06-01), Martin et al.
patent: 4595606 (1986-06-01), Martin et al.
Barajas Felix
Bridges Donald W.
Barr Josephine L.
Geldin Max
McDonnell Douglas Corporation
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