| 摘要 |
Rigid polyurethane foams, preferably semirigid polyurethane foams, are produced by reacting an organic and/or modified organic polyisocyanates with relatively high molecular weight polyhydroxyl compounds and, optionally, low molecular weight chain extenders and/or crosslinkers in the presence of water or mixtures of water and physically acting blowing agents, optionally, catalysts, at least one additive selected from the group consisting of sulfonate salts of an acid group-containing alkylene oxide polymer, a phosphonate salt of an acid group-containing alkylene oxide polymer, and mixtures thereof, additional other additives and optionally, auxiliaries. The polyurethane foams produced by this process can be used to produce composite comprising at least one covering layer and at least one layer comprising a rigid or semirigid polyurethane foam produced by the process of the present invention.
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