Dual cure cathodic electrocoating composition
US4066523A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1977 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Mar 28, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An electrocoating composition containing a polymer having pendant tertiary amine groups, a polymer containing pendant mercaptan groups, a bis-maleimide cross-linking agent, and a photosensitizer can be electrodeposited onto a cathode substrate disposed within an aqueous electrocoating bath. The amine groups and the mercaptan groups are protonated with acid to render the polymers water dispersible prior to electrodeposition and are adapted to become deprotonated upon electrodeposition. Full cure of the electrodeposited coating on the cathode substrate is obtained by the combination of heat curing and ultraviolet radiation curing. In a specific embodiment of the present invention, a single polymer contains both the pendant tertiary amine groups and pendant mercaptan groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.