Heat-reactive crosslinking agent for surface coating binders

摘要

Heat-reactive crosslinking agents for surface coating binders, based on phenolic Mannich bases, are obtainable by reacting (A) one equivalent of a polyphenol with (B) from 0.5 to 2 equivalents of formaldehyde or of a formaldehyde-donating compound and (C) from 0.5 to 1 equivalent of one or more secondary aliphatic amines, removing the water of reaction and reacting the resulting reaction produce with (D) from 0.01 to 1 equivalent of a mono- and/or polyfunctional isocyanate compound.