Bayer Intellectual Property Gmbh

Helmholtz-Zentrum Geesthacht Zentrum Fuer Material- Und Kuestenforschung Gmbh

Covestro Deutschland Ag

Maurice Cosemans

Christoph Gürtler

Jörg Hofmann

Walter Leitner

Thomas Ernst Müller

Muhammad Afzal Subhani

Matthias Wohak

Ralf Schmidt

Dagmar Boltersdorf

Ali Abdullah Tareq Hasson

Thomas Ernst MÜLLER

The present invention relates to a process for the activation of double metal cyanide (DMC) catalysts and to a process for the preparation of polyethercarbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, characterized in that

Method for activating double metal cyanide catalysts for producing polyether polyols

The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter compounds, one or more alkylene oxides and carbon dioxide in the presence of a double metal cyanide catalyst, wherein (&#x3b1;) the H-functional starter substance or a mixture of at least two H-functional starter substances is initially introduced into the reaction vessel, (&#x3b2;) for the activation, a part amount (based on the total amount of the amount of alkylene oxides employed in steps (&#x3b2;) and (&#x3b3;)) of one or more alkylene oxides is added to the mixture resulting from step (&#x3b1;), it also being possible for step (&#x3b2;) to be carried out several times for the activation, (&#x3b3;) one or more alkylene oxides and carbon dioxide are metered continuously into the mixture resulting from step (&#x3b2;) ('copolymerization'), the alkylene oxides employed for the copolymerization being identical to or different from the alkylene oxides employed in step (&#x3b2;), characterized in that in step (&#x3b3;) the carbon dioxide is passed into the mixture by (i) gassing the reaction mixture in the reactor from the bottom, (ii) using a hollow shaft stirrer, (iii) a combination of the metering operations according to (i) and (ii), and/or (iv) gassing over the surface of the liquid by using stirrer units configured in several stages.

Method for producing polyether polyols

The invention relates to covalent polymer networks composed of macro-diacrylates and polyacrylates having shape memory properties and that can be used in medical technology.

Macro-diacrylates and macro-polacrylates

Growing community of inventors

Heinsberg, Germany

Maurice Cosemans