Basf Schwarzheide Gmbh

Basf Aktiengesellschaft

Regina Pretzsch

Juergen Winkler

Holger Seifert

Bernd Guettes

Stefan Dinsch

Robert O'Meara

Georg Heinrich Grosch

Stephan Bauer

Thomas Ostrowski

Kathrin Harre

Reinhard Lorenz

Eva Baum

Inge Rotermund

Gerlinde Tischer

Michael Pcolinski

Karl-Heinz Steinchen

Ralf Fritz

Polyester-polyether block copolymers can be prepared by catalytic addition of alkylene oxides onto H-functional initiator substances, using polyester alcohols as H-functional initiator substances and multimetal cyanide compounds as catalysts.

Polyester-polyether block copolymers

In a process for preparing polyether polyols containing aromatics by molecular addition of alkylene oxides to H-functional initiators at from 70.degree. C. to 135.degree. C. and pressures of from 0.1 MPa to 1.0 MPa, the alkoxylation is carried out using at least one initiator comprising at least 95% by weight of 2,3 and 3,4 isomers of tolylenediamine, from 0.5 to 4% by weight of 2,4 and 2,6 isomers of tolylenediamine and from 0.1 to 1.5% by weight of more volatile fractions from tolylenediamine production. The polyether polyols prepared by this process can be used as component of a polyol mixture for producing rigid polyurethane foams.

Preparation of polyether polyols containing aromatics

The invention relates to a process for the preparation of bromine-containing polyols in which a bromine-containing alcohol is caused to react with an alkylene oxide in admixture with other H-functional compounds and the catalyst used is a system comprising alkaline and Lewis-acid catalysts.

Preparation of bromine-containing polyols

The invention relates to prepolymers containing isocyanate groups which can be prepared by reacting

Prepolymers containing isocyanate groups

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Schwarzheide, Germany

Regina Pretzsch