PROCESS FOR THE PRODUCTION OF CROSSLINKED, URETHANE-CONTAINING PLASTICS

PROCESS FOR THE PRODUCTION OF CROSSLINKED, URETHANE-CONTAINING PLASTICS The instant invention relates to a process for the production of crosslinked plastics comprising reacting organic polyisocyanates, organic polyhydroxyl compounds and olefinically unsaturated monomers, optionally in the presence of catalysts and/or other auxiliaries and additives, wherein (a) the polyhydroxyl compounds used are (1) olefinically unsaturated polyhydroxyl polyesters with OHnumbers in the range of from 200 to 1000, molecular weights in the range of from 200 to 800 and double bond contents of from 0.1 to 0.5 gram equivalents of C=C double bonds per 100 g of polyester, or (2) mixtures of saturated polyhydroxyl compounds of the type known per se in polyurethane chemistry with olefinically unsaturated polhydroxy polyesters, said mixtures having average OH-numbers in the range of from 200 to 1000, average molecular weights of from 200 to 800 and average double bond contents of from 0.1 to 0.5 gram equivalents of C=C double bonds per 100 g of mixture; (b) the olefinically unsaturated monomers used are olefinically unsaturated compounds with no more than one isocyanate-reactive group and boiling points in the range of from 40 to 250.degree.C, the monomers being employed in such quantities that, for every olefinically unsaturated double bond in the polyhydroxyl compound (a) there are from 0.3 to 5 olefinically unsaturated double bonds emanating from the polymerizable monomers; and (c) the quantities in which the reactants are used are selected in such a way that there are from 0.3 to 5 isocyanate groups per hydroxyl group in the reaction mixture.