Bayer Aktiengesellschaft

Covestro Deutschland Ag

Bayer Intellectual Property Gmbh

Horst Zwick

Christian Steinlein

Jörg Hofmann

Klaus Lorenz

Aurel Wolf

Pramod Gupta

Manfred Dietrich

J&ouml;rg Hofmann

Karl-Rudolf Gassen

Rolf Bachmann

Edward P Browne

Karlheinrich Meisel

Fritz Puchner

Michael Traving

Matthias Wohak

Stephan Ehlers

Stefanie Braun

Joachim K&ouml;nig

J&uuml;rgen Reiners

Markus Bodenmüller

Stephan Eckelmann

Friedhelm Baer

Edward Browne

Markus Bodenmueller

The invention relates to an efficient method for producing polyoxyalkylene polyols with equivalent molar masses between 9500 and 23000 g/mol from one or more H-functional starter compounds, and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxide metering rate is reduced once a calculated equivalent molar mass of between 8000 and 9500 g/mol is reached.

Method for producing high molecular weight polyoxyalkylene polyols

The present invention relates to a method for producing polyether carbonate polyols by addition of one or more alkylene oxides and carbon dioxide to one or more H-functional starter substances in the presence of at least one DMC catalyst, in which the reaction is conducted in a main reactor () and a tubular reactor () connected as a post reactor downstream thereof, wherein the method is characterized in that at the outlet () of the tubular reactor () a temperature is set that is at least 10&#xb0; C. above the temperature in the inside of the main reactor (). The invention further relates to a device for carrying out said method.

Method for the production of polyether carbonate polyols and device therefor

The invention relates to a process for the preparation of polyether polyols with equivalent molecular weights of from 8,000 to 20,000 g/mol from one or more H-functional starter compounds and one or more alkylene oxides in the presence of a double metal cyanide catalyst, characterized in that the alkylene oxides are metered into the reactor in the course of from 15 to 23 h.

Process for preparing high molecular weight polyether polyols

The invention relates to a novel process for the preparation of polycondensate solutions based on polyamidoamine/epichlorohydrin resins that gives products having a very low content of organic chlorine compounds, in particular a 1,3-dichlorophenol-2-propanol content of <0.1%, in combination with high activity and good shelf-life.

Wet-strength agent with low DCP content

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.

Method for preparing polyether polyols

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Dormagen, Germany

Horst Zwick