Process for the production of polyisocyanates with a biuret structure

摘要: Polyisocyanates with biuret structures are produced at temperatures above 250° C. More specifically, an excess of a diisocyanate having aliphatically and/or cycloaliphatically bound isocyanate groups is reacted diamine containing amino for relatively brief periods time. Water polyvalent alcohols may optionally be included in the reaction mixture. The polyisocyanates by this process characterized good color, dilutability covalent solvents and comparatively low viscosity.