VERFAHREN ZUR VERHINDERUNG ODER REDUZIERUNG DER NACH DEM EINBRENNEN AUFTRETENDEN VERFÄRBUNG BEI LACKFILMEN

The invention relates to a process for preventing or reducing the discoloration after stoving of enamel coatings produced by the cathodic separation of aqueous electro-dip enamels polluted with iron ions and containing as the binder: A-1 at least one cationic amine-modified epoxy resin containing ac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FOBBE, HELMUT, BRUECKEN, THOMAS
Format:	Patent
Sprache:	ger
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The invention relates to a process for preventing or reducing the discoloration after stoving of enamel coatings produced by the cathodic separation of aqueous electro-dip enamels polluted with iron ions and containing as the binder: A-1 at least one cationic amine-modified epoxy resin containing active hydrogen atoms; or A-2 at least one cationic polyacrylate resin containing active hydrogen atoms; and, as the cross-linking agent: B at least one aliphatic or cycloaliphatic blocked polyisocyanate present as part of the amine-modified epoxy resin or part of the cationic polyacrylate resin or as a separate component. In the process, an ester of 3-(3,5-di-tert.butyl-4-hydroxy-phenyl) propionic acid and a polyalcohol is incorporated into the electro-dip enamels.