Apparatus and method for maintaining a stable bath for an autodeposition composition by periodically separating particular metal ions from the composition
US5538644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D7/142
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An apparatus and method is provided for automated periodic removal of metal ions and contaminants from a chemical bath comprising a latex solution containing charged latex particles and having an acidic pH, used for forming a coating by autodeposition. The system includes a tank containing a chemical bath, an ion exchange column for removing the metal ion contaminants, circulating pump, metal composition sensors, and equipment for regeneration of the ion exchange column. The system particularly includes a filter located at the inlet to the ion exchange column for removing solid particulates, including coagulated latex and debris from the coating solution, while permitting the uncoagulated latex particles to pass through to the ion exchange column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.