Process for separating multivalent metal ions from autodeposition compositions and process for regenerating chelating type ion exchange resins useful therewith
US5409737A · kind A · utility
5Cited by
10References
20Claims
0Family size
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Key dates
| Filing date | Aug 5, 1993 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Aug 5, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D7/142
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The use of chelating type cation exchange resins, particularly those with iminodiacetic acid functionality, to remove dissolved multivalent cations such as iron, zinc, and chromium from used autodeposition compositions permits reuse of the autodeposition compositions without the need for added surfactant and without developing any undesirable graininess or other texture in the coatings formed. The cation exchange resins can be efficiently regenerated with 0.5 to 4% by weight aqueous hydrofluoric acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.