Process for the preparation of polyurethane soft foams with low compression hardness and mixtures of polyoxypropylene-polyoxyethylene block polyols suitable therefor

摘要

items of the invention are a process for the production of polyurethane weichschaumstoffen with low stauchhu00e4rte and relatively good tensile strength by implementation of(a) blockpolyoxypropylen - polyoxyethylene - polyolgemischen with a hydroxylzahl from 14 to 65 and a content of resistant terminally bound ethylenoxideinheiten from 2 to 9%.-%, relative to the weight of the polyoxypropyleneinheiten which are produced by anionic polymerization of alkylenoxide a startermoleku00fclmischung with an average functionality of 2.3 to 1.8 water and glycerin and / or trimethylolpropane or mixtures of these blockpolyoxypropylen - polyoxyethylene - polyolgemische with di - and / or polyoxyethylene polyoxypropylene polyols trifunktionellen - with a hydroxylzahl of 20 to 70, andb) where low molecular weight kettenverlu00e4ngerungsm itteln mitc) organic and / or modified organic polyisocyanatenin the presence of so is vond) catalysts (e) propellant, preferably water, and gegebenenfallsf) tools and / or additivesand this usable blockpolyoxypropylen - polyoxyethylene - polyolgemische.