In a process for preparing polyisocyanate polyaddition products by reacting isocyanates with compounds which are reactive toward isocyanates, in the presence or absence of blowing agents, catalysts, auxiliaries and/or additives, the reaction is carried out in the presence of (i) particles which have a size of <200 .mu.m and a melting point in a range from 50 to 300.degree. C., or in the presence of thermoset particles (ii) or in the presence of particles (i) and (ii).

In einem Prozeß für das Vorbereiten der polyisocyanate polyaddition Produkte, indem man Isozyanats mit Mitteln reagiert, die in Richtung zu den Isozyanats, im Vorhandensein oder in Ermangelung der Treibmittel, Katalysatoren, Helfer und/oder Zusätze reagierend sind, wird die Reaktion in Anwesenheit (i) der Partikel durchgeführt, dessen Größe haben Sie

 
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