Composition for electrodeposition of metal deposits, its method

Details Composition for electrodeposition of metal deposits, its method Composition for electrodeposition of metal deposits, its method

1975-08-11

1978-07-18

Edmundson, F.C.

Chemistry: electrical and wave energy

Processes and products

204 48, 204 49, 204 55R, 204DIG2, C25D 356, C25D 312, C25D 322, C25D 320

Patent

active

041013875

ABSTRACT:
The instant invention is directed to an aqueous bath for the electrodeposition of bright metal deposits, and more particularly to a bath composition which provides upon the basis metal an electrodeposit having improved brightness, particularly in low current density areas, and as well, a condition of ductility markedly better than that which characterizes certain prior art baths. The electroplating bath composition of this invention embodies a polyethylenimine having the general empirical formula --[C.sub.2 H.sub.5 N].sub.x --, and a sulfonating agent for the polyethylenimine, whereby there is obtained a reaction product which contains nitrogen substituted sulfamate groups as an integral part of the polymer chain. The nitrogen substituted sulfamate unit of the reaction product is represented by the formula: ##STR1## where, M = H, Li, Na, K, or, NH.sub.4. The ratio of these nitrogen substituted sulfamate units to amino units, --[CH.sub.2 CH.sub.2 NH]--, in the reaction product is determined by the molar ratio of the polymer repeat unit, --[C.sub.2 H.sub.5 N]--, to sulfonating agent in the reaction.

REFERENCES:
patent: 3472743 (1969-10-01), Rushmere
patent: 3671304 (1972-06-01), Mischutin
patent: 3723263 (1973-03-01), Rosenberg
patent: 3956078 (1976-05-01), Kardos et al.

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