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Heat-curable surface-coating agents, and their use
| Details |
Inventors: Schupp, Eberhard; Loch, Werner; Osterloh, Rolf; Ahlers, Klaas;
Assignee: BASF Aktiengesellschaft (Ludwigshafen, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Heat-curable surface-coating agents useful not only for application as solvent-containing finishes and for powder coating but also, in their protonated form, for cathodic electrocoating contain, as a binder, a mixture of (A) a polyadduct, polycondensate or other polymer having an average molecular weight M.sub.n of from 500 to 10,000 and, per molecule, on average two or more OH and/or primary and/or secondary amino groups and (B) a reaction product of (a) one or more polyisocyanates, (b) one or more secondary monoamines and, if appropriate, (c) one or more polyalcohols having two or more hydroxyl groups. |
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DETAILED DESCRIPTION We claim: 1.
A heat-curable surface coating agent which contains, as a binder, a mixture of (A) one or more polyadducts, polycondensates or other polymers having an average molecular weight M.
sub.
n of from 500 to 10,000 and, per molecule, on average two or more OH or primary or secondary amino groups, or two or more OH and primary or secondary amino groups, or two or more OH and primary and secondary amino groups, with the proviso that component (A) is at least one compound selected from the group consisting of polyester resins including alkyd resins containing one or more monocarboxylic acids or glycidyl esters of branched carboxylic acids, a polydiene resin and a polydiene oil, and (B) a reaction product of (a) one or more polyisocyanates, (b) one or more secondary monoamines and (c) one or more polyalcohols having two or more hydroxyl groups, with the further proviso that component (A) is not a reaction product of epoxy resins with alcohols, mercaptans or amines.
2.
A surface-coating agent as claimed in claim 1, which contains, as component (A), a polyester resin.
3.
A surface-coating agent as defined in claim 1 whereby (B) is a reaction product of (a) and (b).
Description:
The invention relates to novel heat-curable surface-coating agents which harden without acid catalysis, namely not only to those heat-curable surface-coating agents which can be applied conventionally or by means of powder coating but also, in particular, to those which contain basic groups, so that they are water-dispersible on protonation with acids and can be applied by cathodic electrocoating.
German Published Application DAS No.
2,057,799 describes a process for the cathodic electrophoretic deposition of a water-dispersed ionic organic resin which comprises a positively charged amine-containing resin and a blocked multifunctional isocyanate.
The blocking agents mentioned in said DAS are aliphatic or cycloaliphatic alcohols containing from 2 to 8 carbon atoms, phenol, caprolactam, a C
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