Method for preparing polyether polyols
AssigneeBayer Aktiengesellschaft
InventorsStephan Ehlers, Jörg Hofmann, Manfred Dietrich, Pramod Gupta, Christian Steinlein, Horst Zwick
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for the preparation of polyether polyols by means of double metal cyanide (DMC) catalysts, in which the induction phase is shortened markedly. By continuous dispensing of an alkylene oxide into the starter-catalyst mixture it is possible to achieve a substantial shortening of the induction phase by comparison with the batch-wise activation.
Claims6
A process for preparing a polyether polyol by the polyaddition of an alkylene oxide onto a starter compound in the presence of a double-metal cyanide catalyst wherein the double-metal cyanide catalyst is activated in a reactor by the continuous addition of alkylene oxide into the reactor, with the proviso that the pressure of the reactor is constant during the activation of the double-metal cyanide catalyst.
Dependencies are inferred from the claim text.