PRODUCTION OF PU FOAMS

Process for producing PU foams by reacting at least one polyol component with at least one isocyanate component in the presence of one or more catalysts that catalyze the isocyanate-polyol and/or isocyanate-water and/or isocyanate trimerization reactions, and optionally one or more chemical or physical blowing agents, with use of SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units, obtainable through the reaction of polyether diols with equilibrated alpha, omage-diacetoxypolydialkylsiloxanes, wherein a sufficient amount of the SiOC-linked, linear polydialkylsiloxane-polyoxyalkylene block copolymers having repeat (AB) units is added such that the proportion by mass of said component based on the finished PU foam is from 0.0001% to 10% by weight, preferably 0.01% to 6% by weight, especially 0.05% to 5% by weight. 本发明公开了一种制备PU泡沫的方法，其通过在一种或多种催化异氰酸酯-多元醇和/或异氰酸酯-水和/或异氰酸酯三聚反应的催化剂存在下，以及任选的一种或多种化学或物理发泡剂存在下，使用具有(AB)重复单元的SiOC连接的线性聚二烷基硅氧烷-聚氧化烯嵌段共聚物，使至少一种多元醇组分与至少一种异氰酸酯组分反应，所述共聚