| abstract |
The present invention relates to a process for the preparation of (a) compounds which contain no (H) functional groups and which contain aliphatic lactones, aromatic lactones, lactides, cyclic carbonates having at least three optionally substituted methylene groups between the oxygen atoms of the carbonate group, Feeding a suspending agent selected from at least one compound of the group consisting of aliphatic cyclic anhydride and aromatic cyclic anhydride to the reactor; optionally adding a portion of (?) alkylene oxide to the mixture of (?) at 90-150 占 폚, then stopping the addition of the alkylene oxide compound; functional starter (s) in the presence of a bimetallic cyanide catalyst, characterized in that at least one H-functional starting material (s) is metered in to the reactor continuously during the reaction, characterized in that the alkylene oxide and carbon dioxide are reacted with one or more H- (S) to produce a polyether carbonate polyol. |