Neuartige Einkomponenten-Reaktiv-Systeme auf basis von festen Polyisocyanaten

Abstract

engStorage-stable polyurethane one-pack systems are usually cured either by moisture from the environment or by splitting off a blocking agent. The curing characteristics of moisture-curing isocyanate-prepolymers are strongly dependent on humidity and temperature whilst in the case of blocked isocyanate systems special care has to be taken to avoid air pollution. New heterogeneous systems on the basis of usual isocyanate-reactive compounds and solid polyisocyanate particles, which are surrounded by a diffusion-barrier-layer, are highly storage-stable und cure even in thick layers without the need of humidity and without formation of volatile blocking agents or by-products