| 摘要 |
Producing polyether carbonate polyols, comprises: (i) attaching carbon dioxide and propylene oxide or carbon dioxide and a mixture of propylene oxide and at least one further alkylene oxide in a weight ratio of greater than 90:10 to one or more H-functional starting substances in the presence of at least one double metal cyanide (DMC) catalyst; and (ii-1) chain-lengthening the reaction mixture obtained from the step (i) with a mixture containing propylene oxide (PO) and ethylene oxide (EO) in a PO/EO weight ratio of 90/10-20/80 in the presence of at least one DMC catalyst. Producing polyether carbonate polyols, comprises: (i) attaching carbon dioxide and propylene oxide or carbon dioxide and a mixture of propylene oxide and at least one further alkylene oxide in a weight ratio of greater than 90:10 to one or more H-functional starting substances in the presence of at least one double metal cyanide (DMC) catalyst; (ii-1) chain-lengthening the reaction mixture obtained from the step (i) with a mixture containing propylene oxide (PO) and ethylene oxide (EO) in a PO/EO weight ratio of 90/10-20/80 in the presence of at least one DMC catalyst, (ii-2) then chain-lengthening the resulting mixture with a mixture containing PO and EO in a PO/EO weight ratio of 60/40-2/98 in the presence of at least one DMC catalyst; and (iii) chain-lengthening the polyether carbonate polyol resulting from the step (ii) with ethylene oxide or a mixture of PO and EO in a PO/EO weight ratio of 5/95-0.1/99.9 in the presence of at least one DMC catalyst. A weight portion of EO in the mixture containing PO and EO in the step (ii-2) is higher than the weight portion of EO in the mixture containing PO and EO in step (ii-1). An independent claim is included for producing flexible polyurethane foams by a polyol component (component A) containing a polyether carbonate polyol. |
