Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1991-11-27
1993-03-23
Bell, Mark L.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 123, 106 124, 106 125, 106 126, 106 127, 106 128, 106 129, 427 98, 427437, 4274431, C23C 1831, B05D 512
Patent
active
051960532
ABSTRACT:
An environmentally innocuous effective replacement for thiourea is disclosed for use as a complexing agent in displacement plating processes in which the plating solution is applied to the substrate surface to be plated by immersion or by spraying, cascading, pouring and the like. The replacement complexing agent is an imidazole-2-thione compound having the formula: ##STR1## wherein A and B are the same or different --R--Y groups, wherein R is linear, branched or cyclic alkenyl group containing 1 to 12 carbon atoms and Y is a hydrogen, halogen, cyano, vinyl, phenyl, or ether moiety. Of this class of compounds, 1-methyl-3-propyl-imidazole-2-thione is preferred for immersion tin plating. This class of complexing agents is particularly useful in spray displacement tin plating for the manufacture of printed circuit boards wherein free tin metal is added to the plating solution.
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Arduengo III Anthony J.
Dodd John R.
King Randal D.
Vitale Americus C.
Bell Mark L.
Hauser William P.
Klemanski Helene
Lucas James A.
McGean-Rohco, Inc.
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