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filingDate 1990-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
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publicationDate 1991-06-26-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0433889-A2
titleOfInvention Process for the preparation of polyurethane soft foams with low compression hardness and mixtures of polyoxypropylene-polyoxyethylene block polyols suitable therefor
abstract a) Blockpolyoxypropylen-polyoxyethylen-polyolgemischen mit einer Hydroxylzahl von 14 bis 65 und einem Gehalt von endständig gebundenen Ethylenoxideinheiten von 2 bis 9 Gew.-%, bezogen auf das Gewicht der Polyoxypropyleneinheiten, die hergestellt werden durch anionische Polymerisation der Alkylenoxide an eine Startermolekülmischung mit einer durchschnittlichen Funktionalität von 2,3 bis 2,8 aus Wasser und Glycerin und/oder Trimethylolpropan oder Mischungen dieser Blockpolyoxypropylen-polyoxyethylen-polyolgemische mit di- und/oder trifunktionellen Polyoxypropylen-polyoxyethylen-polyolen mit einer Hydroxylzahl von 20 bis 70, und b) gegebenenfalls niedermolekularen Kettenverlängerungsmitteln mit c) organischen und/oder modifizierten organischen Polyisocyanaten nin Gegenwart von d) Katalysatoren, e) Treibmitteln, vorzugsweise Wasser, sowie gegebenenfalls f) Hilfsmitteln und/oder Zusatzstoffen n und die hierfür verwendbaren Blockpolyoxypropylen-polyoxyethylen-polyolgemische.The invention relates to a process for the production of flexible polyurethane foams with low compressive strength and relatively good tensile strength by reacting a) Block polyoxypropylene-polyoxyethylene-polyol mixtures with a hydroxyl number of 14 to 65 and a content of terminally bound ethylene oxide units of 2 to 9 wt .-%, based on the weight of the polyoxypropylene units, which are prepared by anionic polymerization of the alkylene oxides to a mixture of starter molecules with a average functionality of 2.3 to 2.8 from water and glycerol and / or trimethylolpropane or mixtures of these block polyoxypropylene-polyoxyethylene-polyol mixtures with di- and / or trifunctional polyoxypropylene-polyoxyethylene-polyols with a hydroxyl number of 20 to 70, and b) optionally with low molecular weight chain extenders c) organic and / or modified organic polyisocyanates in the presence of d) catalysts, e) blowing agents, preferably water, and optionally f) auxiliaries and / or additives and the block polyoxypropylene-polyoxyethylene-polyol mixtures that can be used for this.
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