Heat-curable coating composition for cathodic electrocoating
AssigneeBASF Lack + Farben Aktiengesellschaft
InventorsThomas Schwerzel, Hans Schupp, Klaus Huemke, Dieter Faul, Ulrich Heimann
Life of this patent
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Abstract
A heat-curable coating composition for cathodic electrocoating which becomes water-thinnable on protonation with an acid contains (A) 50-95% by weight of a polycondensation or polyaddition product having an average molecular weight of from 500 to 20,000 and containing primary and/or secondary hydroxyl groups and primary, secondary and/or tertiary amino groups, and (B) 5-50% by weight of a crosslinking agent obtainable by reacting a) an aliphatic polyhydroxy compound and b) an aromatic polyhydroxy compound with c) an aliphatic and/or cycloaliphatic polyisocyanate and d) a blocking agent.
Claims8
A heat-curable coating composition for cathodic electrocoating which becomes water-thinnable on protonation with an acid, containing
- (A) 50-95% by weight of a polycondensation or polyaddition product having an average molecular weight M.sub.n of from 500 to 20,000 and containing primary and/or secondary hydroxyl groups and primary, secondary and/or tertiary amino groups, and
- (B) 5-50% by weight of a crosslinking agent obtain by reacting
- a) an aliphatic polyhydroxy compound and
- b) an aromatic polyhydroxy compound with
- c) an aliphatic and/or cycloaliphatic polyisocyanate and
- d) a blocking agent.
Dependencies are inferred from the claim text.