Binders for electrocoating
AssigneeBASF Lacke + Farben, AG
InventorsKlaus Huemke, Gerhard Hoffmann, Dieter Faul, Rainer Blum
Life of this patent
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Abstract
Binder systems suitable for electrocoating and consisting of a base resin A which carries groups which can be protonated with acids or cationic quaternary groups and, if desired, hydroxyl or thiol groups, a crosslinking component B which carries at least two blocked isocyanate groups per molecule and an organic iron compound C which is partially or completely soluble in water, as a catalyst for the thermal crosslinking of components A and B, and if desired, an additive D which increases the catalytic activity of C, are used to prepare dispersions which are used for electrocoating.
Claims16
A binder system which is suitable for electrocoating and consists essentially of
- an essentially olefinic free base resin A which carries primary and/or secondary amino groups which can be protonated with acids or cationic quaternary groups and, optionally, hydroxyl or thiol groups,
- a crosslinking component B which carries at least two blocked isocyanate groups per molecule,
- an organic iron compound C, obtained by reaction of iron (III) salts with aromatic aldehydes, which is partially or completely soluble in water, as a catalyst for the thermal crosslinking of components A and B, and
- optionally, an additive D which increases the catalytic activity of C.
Dependencies are inferred from the claim text.