Basf Aktiengesellschaft

Basfaktiengesellschaft

Basf Aktiengesellscaft

Basf Se Corporation

Stefan Dinsch

Bernd Guettes

Holger Seifert

Gottfried Knorr

Juergen Winkler

Regina Pretzsch

Gerd Hoeppner

Karl-Heinz Steinchen

Georg Heinrich Grosch

Stephan Bauer

Heinz-Dieter Lutter

Thomas Ostrowski

Heinz Auer

Kathrin Harre

Reinhard Lorenz

Eva Baum

Andreas Emge

Harald Larbig

Klaus Wagner

Johann Klassen

Michael Reichelt

Inge Rotermund

Michael Pcolinski

Peter Von Malotki

J&uuml;rgen Winkler

Gerlinde Tischer

Monika Wetterling

Gerd H&ouml;ppner

Jens Bruhn

Jürgen Winkler

Gerd Höppner

Christian Stelling

The invention relates to a process for producing rigid polyurethane foams by reacting

Method for producing rigid polyurethane foams

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

Polyetherols based on solid initiator substances and liquid, hydroxyl-containing coinitiators are prepared by a catalyzed addition reaction of alkylene oxides by a process in which the initiator combination contains diols carrying ethoxy structures, the ratio of the average number of hydroxyl groups per mole of initiator combination to the number of ethoxy structures in the polyetherol being from 1:0.2 to 1:1.8 and the ratio of the amounts by weight of the diols carrying ethoxy structures to the average molecular weight of the polyetherol being from 1:2 to 1:15. The polyetherols prepared by this process are used for the preparation of PUR, in particular, rigid PUR foams.

Preparation of polyetherols

A process for treating polyether polyols prepared in a conventional manner by base-catalyzed reaction of H-functional initiator substances with alkylene oxides comprises a combination of a thermal-reactive step at a pH of less than 7 and a temperature above 60&deg; C. and a thermal-distillative step in a countercurrent column using a purifying agent. The polyether polyols prepared according to the invention are used for producing low-fogging and low-odor PUR foams.

Treatment for polyether polyols

Polyurethanes having improved curing are prepared by reacting

Preparation of polyurethanes having improved curing

In a process for producing flexible polyurethane foams by reacting

Production of flexible polyurethane foams

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

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Schipkau, Germany

Stefan Dinsch