Bayer Aktiengesellschaft

Other

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Christian Steinlein

J&ouml;rg Hofmann

Stephan Ehlers

Horst Zwick

Jörg Hofmann

Klaus Lorenz

Bernd Klinksiek

Jose F Pazos

Walter Sch&auml;fer

Lars Obendorf

Bert Klesczewski

Pieter Ooms

Harald Pielartzik

Pramod Gupta

Manfred Dietrich

Gerhard Wegener

Edward P Browne

Friedhelm Baer

Markus Bodenmüller

Stephan Eckelmann

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 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

This invention relates to novel double metal cyanide (DMC) catalysts for the production of polyether polyols by polyaddition of alkylene oxides onto starter compound comprising active hydrogen atoms, wherein the catalyst contains a) double metal cyanide compounds, b) organic complex ligands other than c) and c) two or more complex-forming components from the classes of compounds comprising functionalised polymers, glycidyl ethers, glycosides, carboxylic acid esters of polyhydric alcohols, bile acids or the salts, esters or amides thereof, cyclodextrins, phosphorus compounds, &#x3b1;,&#x3b2;-unsaturated carboxylic acid esters or ionic surface- or interface-active compounds. The catalysts according to the invention exhibit greatly increased activity in polyether polyol production.

Double metal cyanide catalysts for producing polyether polyols

Aliphatic polycarbonate homo- and co-polymers are obtained by ring-opening homo- or co-polymerization of cyclic carbonates by DMC catalysis. These polymers are useful in the production of polyurethanes.

Aliphatic polycarbonate homo-and co-polymers produced by DMC catalysis and the process for their production

The present invention relates to a process for the production of polyether polyols by polyaddition of alkylene oxides onto starter compounds containing active hydrogen atoms conducted in the presence of a double-metal cyanide catalyst wherein a reaction mixture is guided at least once through a zone which has an energy density of at least 10 J/m and wherein the residence time of the reaction mixture in this zone is at least 10 seconds per pass.

Process for the preparation of polyether polyols

The present invention relates to a process for the production of a polyether polyol by polyaddition of an alkylene oxide onto a starter compound containing active hydrogen atoms conducted in the presence of a double metal cyanide catalyst comprising conducting a reaction mixture at least once through a zone which has an energy density of at least 5&times;10 J/m , wherein the dwell time of the reaction mixture in this zone is at least 10 seconds per pass.

Process for producing polyether polyols

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

A process for producing a mixture of isomers of dinitronaphthalene by nitration of nitronaphthalene, in which nitronaphthalene, optionally in an inert organic solvent, is reacted with 1 to 20 times the equivalent quantity, based on the quantity of nitronaphthalene, of 50% to 100% nitric acid in the presence of a solid, perfluorinated, strongly acidic ion exchanger.

Method for producing a dinitronaphthalene-isomer mixture having a high 1,5-dinitronaphthalene proportion

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Ratingen, Germany

Christian Steinlein