JPH0370734B

Process for the production of water-hardenable compositions of organic polyisocyanates and polyamines containing at least partly blocked amino groups present as ketimines, the combinations essentially representing mixtures and optionally reaction products containing urea groups by mixing the organic polyisocyanates with the polyamines in such quantities that the equivalent ratio of isocyanate groups to blocked and free amino groups is between about 0.9:1 and 4:1 and reacting any free amino groups present with some of the isocyanate groups in the polyisocyanate to form ureas, characterized in that the polyamines containing at least partly blocked amino groups used are mixtures comprising (a) from about 50 to 95 amine equivalent percent of organic compounds which are free from primary and secondary amino groups and which contain at least two ketimine groups corresponding to the following formula in which R1 represents an alkyl or cycloalkyl radical and R2 represents hydrogen or an alkyl or cycloalkyl radical or in which R1 and R2 form a cycloaliphatic hydrocarbon radical together with the two carbon atoms of the ketimine group and (b) from about 5 to 40 amine equivalent percent of organic compounds which are free from primary and secondary amino groups and which contain at least two ketimine groups of which one corresponds to the formula in which R1 and R2 are as defined above, the other ketimine group(s) present correspond(s) to the formula shown in (a).