Solutions of isocyanato-isocyanurates in plasticizers for polyvinylchloride, process for their preparation and their use in adhesion improving additives in coating agents based on plasticized polyvinylchloride

摘要

The invention relates to solutions of isocyanate group-containing mixed trimers of (i) diisocyanatotoluene and (ii) diisocyanatodiphenylmethane isomers in a molar ratio (i) :( ii) of 5: 1 to 1: 3 in plasticizers for polyvinyl chloride, a process for the preparation of such solutions Catalytic trimerization of part of the isocyanate groups of such diisocyanates either in the presence of the plasticizers as solvents or in the absence of such plasticizers, but the trimerization product, if appropriate after removal of excess starting diisocyanate, is dissolved in such a plasticizer, and the use of such solutions as adhesion-improving additives in coating compositions based on plasticized polyvinyl chloride.