Water soluble or water dispersible polyisocyanate mixtures and their use in stoving compositions

Abstract

The present invention relates to a polyisocyanate mixture which has blocked isocyanate groups and an average NCO-functionality, based on reversibly blocked isocyanate groups, of 2.0 to 2.6, and is the reaction product, converted into the salt form by the at least partial neutralization of the incorporated carboxyl groups, of i) at least one organic diisocyanate having a molecular weight of 168 to 300 with ii) at least one monofunctional blocking agent for isocyanate groups, iii) at least one monobasic or dibasic hydroxycarboxylic acid, iv) 1 to 15 wt. %, based on the weight of component i), of at least one dihydric to hexahydric alcohol having a molecular weight of 62 to 182 and v) 50 to 500 wt. %, based on the weight of component i), of at least one diol having a molecular weight of 350 to 950 and containing ester groups. The present invention also relates to the use of this polyisocyanate mixture in combination with water dispersible or water soluble polyhydroxyl compounds for the production of aqueous stoving lacquers.

Dependencies are inferred from the claim text.