Aqueous coating composition based on a cationic amino urea resin, process for applying and baking the composition and the coated substrate thus obtained
AssigneeAkzo N.V.
InventorsKarl-Heinz Freese, Hans-Jurgen Munch
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Abstract
The invention provides an aqueous coating composition based on a cationic amino urea resin having an amine number of 3-250 and obtained by reacting an organic isocyanate with a polyamino amide having an amine number of 40-500 and built up from a mono- or dicarboxylic acid and a polyamine, said composition also containing a solid particulate epoxy group-containing compound and/or a solid particulate polyester having a melting point of at least 40.degree. C. The invention also pertains to the process for applying and baking said composition and to the coated substrate thus obtained.
Claims21
An aqueous coating composition based on a cationic amino urea resin having an amine number of 3-250 and obtained by reacting
- (A) an organic isocyanate having 1-4 isocyanate groups and 2-48 carbon atoms with
- (B) a polyamino amide having an amine number of 40-500 built up from
- 1. at least one of a mono- and dicarboxylic acid having 2-40 carbon atoms and
- 2. a polyamine having 2-8 amino groups selected from primary and secondary amino groups and 2-20 carbon atoms,
- and neutralization of at least part of the amino groups, characterized in that the coating composition also contains 5-1000 parts by weight (calculated on 100 parts by weight of the cationic binder as solid matter) of at least one solid compound selected from a solid epoxy group-containing compound having a number average molecular weight of at least 900 and an epoxy equivalent weight in the range of from 450 to 7500 and a solid polyester compound, the solid compound having a melting point of at least 40.degree. C. and an average particle size in the range of from 0,5, to 35 .mu.m .
Dependencies are inferred from the claim text.