| 摘要 |
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 -[C2H5N]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: <IMAGE> where, M = H, Li, Na, K, or, NH4. The ratio of these nitrogen substituted sulfamate units to amino units, -[CH2CH2NH]-, in the reaction product is determined by the molar ratio of the polymer repeat unit, -[C2H5N]-, to sulfonating agent in the reaction. |
