Cleaning and liquid contact with solids – Processes – Oils – grease – tar – or wax removal – by dissolving
Patent
1996-11-19
1998-06-30
Houtteman, Scott W.
Cleaning and liquid contact with solids
Processes
Oils, grease, tar, or wax removal, by dissolving
134 2, 134 42, 510175, B08B 700
Patent
active
057727899
ABSTRACT:
An aqueous cleaning composition which is capable of removing soldering flux residues, particularly water-soluble flux residues, from a surface of an electronic assembly without leaving significant amounts of white residue on the surfaces of cleaning equipment used in the flux-removal process, contains: (A) a flux-removing portion containing an alkaline salt component composed of at least one potassium salt; and (B) an aqueous portion in which the flux-removing portion is disposed. The composition has a non-potassium alkali metal content of no greater than about 5% by weight. Preferably, the alkaline salt component consists essentially of a potassium salt or mixture of potassium salts, most preferably potassium carbonate or a mixture of potassium carbonate salts. A method of substantially removing soldering flux residues from an electronic assembly surface without leaving significant amounts of white residue on surfaces of cleaning equipment used in the flux-removal method involves applying the aforementioned cleaning composition onto the electronic assembly surface for a period of time sufficient to substantially saponify the flux residues so as to form saponified flux residues, and then removing the saponified flux residues from the electronic assembly surface.
REFERENCES:
patent: 5234505 (1993-08-01), Winston et al.
patent: 5234506 (1993-08-01), Winston et al.
patent: 5549761 (1996-08-01), Winston et al.
Cala Francis R.
Eichhorn Eric E.
Church & Dwight & Co., Inc.
Fishman Irving
Houtteman Scott W.
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