Aqueous electronic circuit assembly cleaner and method
AssigneeChurch & Dwight Co., Inc.
InventorsAlfredo Vinci, M.Stephen Lajoie, Anthony E. Winston
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Abstract
The present invention relates to environmentally safe aqueous saponifier compositions for cleaning electronic circuit assemblies, such as printed circuit or printed wiring boards, during their fabrication. Alkali metal carbonate and bicarbonate salts are utilized preferably with various adjuvants, such as an antifoam agent or surfactant to achieve a variety of objectives, among which are the removal of solder flux, oils, waxes, and greasy substances and adhesive and other residues.
Claims10
A saponifier composition for removing rosin soldering flux and other residues from electronic circuit assemblies and consisting essentially of substantially water soluble components, said substantially water soluble components comprising a mixture of alkali-metal carbonate and bicarbonate salts and about 6-10 wt. % based on the composition of a surfactant, said substantially water soluble components being free of a chelating agent and so combined that when in an aqueous saponifier solution of from about 1 to 1.7 percent by weight said solution has a pH of from about 10 to 12 and an adequate reserve of titratable alkalinity, at least equivalent to about 0.6 to 4.5 percent caustic potash when titrated to the colorless phenolphthalein end point.
Dependencies are inferred from the claim text.