Patent ID: 8691987

Claim:
A process for making a polymeric phenazonium compound and using said compound in a plating bath, said process comprising: (a) dissolving an effective amount of an amino compound in a formic acid solution; (b) adding a nitrite salt to diazotize the amino compound; and (c) adding sulfamic acid to neutralize any excess nitrous acid that may be formed in step b); whereby a polymeric phenazonium compound is produced; wherein the amino compound comprises an amino compound selected from the group consisting of 2-methyl-3-amino-7-dimethylamino-5-phenyl-phenazonium sulfate, 3-amino-6-methyl-7-dimethylamino-5-phenyl-phenazonium hydrogen sulfate, 2-methyl-3-amino-7-diethylamino-5-phenyl-phenazonium chloride, 3-amno-dimethylamino-5-methyl hydrogen sulfate, 2-methyl-3-amino-7-dimethylamino-phenazonium hydrogen sulfate, 3-amino-7-methlamno-5-phenylphenazonium acetate, 2-phenyl-3-amino-7-ethylamino-5-phenyl-phenazonium chloride, 1,2,6,9-tetrametyl-3-amno-7-diethylamino-5-phenylphenazonium hydrogen sulfate, 2-8-dimethyl-3-amino-7-diethylamino-5-phenyl-phenazonium hydrogen sulfate, 2,8-dimethyl-3-amino-7-diethylamino-5-tolyl-phenazonium chloride, and 2,9-diphenyl-3-amino-6-metyl-7-dimethylamino-5-phenyl-phenazonium hydrogen sulfate; (d) adding said polymeric phenazonium compound to a plating bath.