Method of producing polymeric phenazonium compounds
US8691987B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 24, 2010 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Jun 18, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D3/38
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process of making a polymeric phenazonium compound having the general formula:wherein R1, R2, R4, R5, R6, R8 and R9 are the same or different, and represent hydrogen, a low alkyl or a substituted aryl, R3 starts with NH2 and is diazotized followed by polymerization, R5 and R8 may alternatively represent monomeric or polymeric phenazonium radicals, R7 with its substituent group is a substituted amine, with RX and RY representing any combination of CH3, C2H5,and hydrogen, except that RX and RY 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.