| 摘要 |
Producing polyether carbonate polyol, comprises (a) producing polyether carbonate polyol from at least one hydrogen-functional starting substance, at least one alkylene oxide and carbon dioxide in presence of at least one double metal cyanide catalyst, and (b) carrying out chain extending of the polyether carbonate polyol with a mixture of at least two different alkylene oxides in presence of at least one double metal cyanide catalyst. Independent claims are also included for: (1) the polyether carbonate polyol comprising the terminal mixing block made of at least two alkylene oxides; (2) producing flexible polyurethane foams having a bulk density of 10-150 kg/m 3>according to DIN EN ISO 3386-1-98and a compressive strength of 0.5-20 kPa according to DIN EN ISO 3386-1-98, comprising reacting polyol component containing (in parts by wt.) polyether carbonate polyol (10-100), polyether polyol (0-90), water and/or physical propellants (0.5-25), auxiliaries and additives (0.05-10) e.g. catalysts, surfactants, additives, pigments or flame retardants and compounds (0-10) containing isocyanate-reactive hydrogen atoms with a molecular weight of 62-399, with polyisocyanate, where the production takes place at an index of 50-250, and the sum of the weights of the polyol component and the polyisocyanate in the composition is 100 parts by wt.; and (3) the flexible polyurethane foams obtained by the above method. |
