Cathodic electrocoating binders
AssigneeBASF SE
InventorsEberhard Schupp, Werner Loch, Rolf Osterloh, Klaas Ahlers
Life of this patent
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Abstract
Binders useful for cathodic electrocoating are water-dilutable on addition of acid and comprise a mixture of (A) a polyadduct which carries basic nitrogen groups and contains groups of the formula (I) and/or (II) ##STR1## where R.sup.1 and R.sup.2 are hydrogen or methyl and R.sup.3 and R.sup.4 are alkyl or hydroxyalkyl or together are a 5- or 6-membered ring, and (B) a reaction product of a polyisocyanate and an olefinically unsaturated amine which carries a secondary amino group and a methacrylamide or methacrylate group.
Claims3
A binder which is water-dilutable on addition of acid, is suitable for preparing cathodic electrocoating compositions and comprises a mixture of
- (A) from 60 to 95% by weight of a polyadduct which carries basic nitrogen groups and contains groupings of the formula (I) or (II) or (I) and (II) ##STR6## where R.sup.1 and R.sup.2 are identical or different and each is hydrogen or methyl, and R.sup.3 and R.sup.4 are identical of different and each is alkyl of 1 to 9 carbon atoms or hydroxyalkyl of 2 to 10 carbon atoms, or R.sup.3 and R.sup.4 together are a 5- or 6-membered ring and
- (B) from 5 to 40% by weight of a reaction product of a polyisocyanate and an olefinically unsaturated amine which carries a secondary amino group and a methacrylamide or methacrylate group.
Dependencies are inferred from the claim text.