Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1974-08-14
1977-01-25
Drummond, Douglas J.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156635, 252 794, 252 793, C09K 1308
Patent
active
040049566
ABSTRACT:
Acidic solutions for selectively stripping tin or tin-lead alloys from copper substrates comprising an aqueous solution of at least one nitro-substituted aromatic compound; an inorganic acid capable of readily reacting with tin and lead to form water-soluble salts thereof and incapable of reacting with tin and lead to form a water-insoluble compound film on the tin or tin-lead alloy surface, preferably fluoboric acid; a thiourea; an organic acid of the formula RCOOH wherein R is 1-2C alkyl or hydrogen; and a haloacetic acid wherein the halogen is chloro or bromo. The haloacetic acid in combination with the acid of the formula RCOOH result in a pronounced synergism in accelerating the rate of stripping the tin or tin-lead alloy deposit from the copper substrate.
REFERENCES:
patent: 2652360 (1953-09-01), Bond et al.
patent: 3061494 (1962-10-01), Snyder et al.
patent: 3677949 (1972-07-01), Brindisi et al.
patent: 3888778 (1975-06-01), Beckwith et al.
Drew R. J.
Drummond Douglas J.
Enthone Incorporated
Massie Jerome W.
Schaffer E. J.
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