Abstract: This invention relates to a process for the production of new polyisocyanate mixtures containing blocked isocyanate groups, to binders containing these polyisocyanate mixtures and to the use of the new polyisocyanate mixtures as an isocyanate component in polyurethane stoving lacquers.

Abstract: This invention relates to a process for producing stable water dispersible blocked polyisocyanates, the compounds so produced and their use in producing coatings and films. These compounds are produced by blocking about 50 to 99.8 weight % of the isocyanate groups of an organic polyisocyanate and then reacting the partially blocked polyisocyanate with a compound carrying both an isocyanate reactive hydrogen and a hydrophilic group, e.g. a carboxylic acid salt or polyethylene oxide or a group convertible to a hydrophilic group, e.g. a carboxylic acid or tertiary amine. The blocked polyisocyanate with hydrophilic groups may then be dispersed in water with organic compounds having at least two isocyanate reactive hydrogen atoms per molecule and then cured by driving off the water and raising the temperature sufficiently high to unblock the polyisocyanate.