Self-accelerating and replenishing non-formaldehyde immersion coating method
US5543182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1995 |
| Grant date | Aug 6, 1996 |
| Priority date | — |
| Expiry date | Feb 16, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2203/0392
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process for applying a metal coating to a non-conductive substrate without an electroless coating is disclosed. The process includes the step of: a. contacting said substrate with an activator comprising a noble metal/Group IVA metal sol to obtain a treated substrate; b. contacting said treated substrate with a self accelerating and replenishing immersion metal composition comprising a solution of (i) a soluble metal salt whose metal is more noble than said Group IVA metal, (ii) a Group IA metal hydroxide, (iii) a complexing agent comprising an organic material having a cumulative formation constant log K of from about 0.73 to about 21.95 for an ion of the metal of said metal salt. The Group IVA metal is employed in a stoichiometric excess compared to the noble metal, the excess Group IVA metal being in its lowest oxidation state. Self accelerating and replenishing non-formaldehyde immersion metal compositions are also disclosed. The composition is used in a two step process to electrolytically coat a nonconductive substrate. In the first step the conductivity of the substrate is increased by applying the composition to it. In the second step, the substrate treated with the compo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.