Electro-dip coating method
AssigneeE. I. DuPont de Nemours and Company
InventorsNorbert David, Klausjörg Klein, Walter Kühhibi
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Abstract
Use of water-insoluble organic nitrites and/or nitrates as additives for electrodeposition coating compositions, and process for the production of an electrodeposition lacquer with improved adhesion for subsequent coats in which one or more water-insoluble organic nitrites and/or nitrates is added to the electrodeposition coating composition and the coating film obtained by electrodeposition is stoved in an indirectly heated circulating air oven.
Claims9
A process for the production of an electrodeposition coating film with improved adhesion for subsequent coats comprising the steps of cathodically depositing a coating film from a cathodic electrodeposition coating composition onto an electrically conductive substrate and baking the film in an indirectly heated circulating air oven;
- wherein a proportion of fresh air introduced into the oven is 0 to 20 volume % of the circulating air in the oven;
- and
- wherein the cathodic electrodeposition coating composition comprises resin solids and at least one water-insoluble nitrogen compound selected from the group consisting of organic ester nitrites, organic ester nitrates and mixtures thereof.
Dependencies are inferred from the claim text.