申请人:Krol Andrew M.
公开号:US20120077956A1
公开(公告)日:2012-03-29
A process of making a polymeric phenazonium compound having the general formula:
wherein R
1
, R
2
, R
4
, R
5
, R
6
, R
8
and R
9
are the same or different, and represent hydrogen, a low alkyl or a substituted aryl, R
3
starts with NH
2
and is diazotized followed by polymerization, R
5
and R
8
may alternatively represent monomeric or polymeric phenazonium radicals, R
7
with its substituent group is a substituted amine, with R
X
and R
Y
representing any combination of CH
3
, C
2
H
5
,
and hydrogen, except that R
X
and R
Y
cannot both be hydrogen, A is an acid radical, and n is an integer from 2 to 100, preferably from 2 to 20 is described. The polymeric phenazonium compound is usable in as an additive in a metal plating bath. The method includes the steps of: 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.