PROCESS FOR THE PRODUCTION OF MOULDED BODIES WHICH ARE CELLULAR OR NOT

摘要

The present invention is directed to a process for the production of optionally cellular, polyurethane and/or polyurethane-urea moldings having an impervious skin by reacting in a closed mold a reaction mixture containing (a) at least one organic polyisocyanate, (b) at least one compound which has a molecular weight of about 400 to 12,000 and at least two isocyanate-reactive groups, and (c) optionally at least one compound which has a molecular weight of from 32 to 399 and at least two isocyanate-reactive groups, wherein before the reaction takes place a surface-improving additive (e) is added containing (e1) a liquid and sedimentation-stable polymer dispersion which is produced by the free radical addition polymerization or copolymerization of one or more olefinically unsaturated monomers in a high molecular weight compound having isocyanate-reactive groups of the type mentioned in (b), and optionally (e2) a metal salt of a monocarboxylic acid having at least 8 carbon atoms in the molecule wherein additive (e) is used in a quantity such that about 0.01 to 3 parts by weight of polymer solids of the polymer dispersion (e1) and up to about 2 parts by weight of metal salt (e2) are incorporated per 100 parts of component (b).