Metal treatment – Compositions – Fluxing
Patent
1991-12-31
1993-03-23
Rosenberg, Peter D.
Metal treatment
Compositions
Fluxing
148 24, 148 25, B23K 3534
Patent
active
051960702
ABSTRACT:
A water soluble, thermally stable, solder flux for use in forming a water soluble, thermally stable, solder paste is provided. The water soluble, thermally stable, solder flux contains an acidic ester component having about 50% to about 60% monoesters by weight based on total weight, about 40% to about 50% diesters by weight based on total weight, and about 0% to about 1.5% phosphoric acid by weight based on total weight. This ester component is combined with triethanolamine to form a flux vehicle having a molar ratio of triethanolamine to the ester component of about 0.6 to about 1.2. This vehicle is present in the solder flux in an amount from about 68% to about 79% by weight based on total weight of solder flux. The flux also contains rheology adjusting components in an amount ranging from about 17% to about 26% by weight based on total weight of solder flux. Citric acid included in the flux in an amount ranging from about 4% to about 6% by weight based on total weight of solder flux.
REFERENCES:
patent: 3065538 (1962-11-01), Melchiors
patent: 4140554 (1979-02-01), Stayner
patent: 4428780 (1984-01-01), Shedroff
patent: 4478650 (1984-10-01), Zado
Ables Wallace H.
Howle Dwight R.
Humphrey John S.
Raines Robert G.
Reich Richard A.
Dillon Andrew J.
International Business Machines - Corporation
Rosenberg Peter D.
Yee Duke W.
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