Surface coating binders which are self-crosslinking when heated, their preparation and their use

摘要

The present invention relates to surface coating binders which are self-crosslinking when heated and are based on resin-like polyadducts, polycondensates or polymers. These binders have a mean molecular weight &upbar& Mn of from 500 to 10,000 and contain, on average per molecule, at least two groups of the general formula wherein R1, R2, R3 and R4 are identical or different and are each hydrogen or a methyl or ethyl radical, and additionally contain hydroxyl and/or primary and/or secondary amino groups and may or may not contain tertiary amino groups. They can be prepared by reacting appropriate resins containing primary amino groups with cyclic carbonates, and can be used, in solution in an organic solvent, as baking finishes, as well as for the preparation of cathodic electrocoating finishes.