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US 4,086,292 AGranted
Surface-coating binders
AssigneeBASF SE
InventorsFritz Erdmann Kempter, Heinrich Hartmann, Herbert Spoor
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Abstract
A surface-coating binder which is substantially free from epoxide groups is obtained by reacting Mannich bases, obtained from condensed phenols, secondary amines which contain at least one hydroxyalkyl group, and formaldehyde, with epoxy resins having an epoxide value of from 0.15 to 0.6, which carry blocked isocyanate groups. In the protonized form, the binders may be used for the cationic electrocoating of metal articles.
Claims12
A surface-coating binder which is substantially free from epoxide groups and is obtained by reacting
- (a) 15 to 80% by weight of Mannich bases obtained from
- (a.sub.1) condensed phenols,
- (a.sub.2) secondary amines which contain at least one hydroxyalkyl group and
- (a.sub.3) formaldehyde with
- (B) 85 to 20% by weight of epoxy resins having an epoxide value of from 0.15 to 0.6, which are virtually free from free isocyanate groups, carry blocked isocyanate groups and are prepared by the reaction of hydroxy-containing epoxy resins with partially blocked diisocyanates.
2 more elements
Dependencies are inferred from the claim text.