Basf Aktiengesellschaft

Reinhard Peters

Matthias Marx

Ingolf Buethe

Heinz-Dieter Lutter

Wolfgang Straehle

Werner Hinz

Erhard Reich

Michael Lugmayr

Gisbert Schleier

Walter Decker

Reinhard Leppkes

Volker Haase

Flexible polyurethane foams having low compressive strength and relatively good tensile strength are prepared by reacting

Preparation of flexible polyurethane foams having low compressive

Diphenylmethane diisocyanate-based liquid polyisocyanate mixtures containing urethane groups and having an isocyanate content of from 12 to 30 percent by weight are obtained by reaction of a polyoxypropylene polyoxyethylene polyol containing 5 to 30 percent by weight of oxyethylene with diphenylmethane diisocyanate-based isocyanates. These polyisocyanate mixtures are storage stable at low temperature and yield flexible polyurethane foams having improved mechanical properties.

Diphenylmethane diisocyanate-based liquid polyisocyanate mixtures

For the preparation of elastic flexible polyurethane foams with improved breaking elongation and very good setting behavior as well as densities from 7 to 120 grams per liter, organic polyisocyanates are reacted in the presence of blowing agents, catalysts and, optionally, auxiliaries and/or additives with polyols based on polyoxyalkylene polyols having terminal oxyethylene blocks of a degree of oxyethylation of 1 to 13 and which have a content of primary hydroxyl groups at the corresponding degree of oxyethylation equal or exceeding the value of curve A in the Figure in which curve A describing the relationship of the content of primary hydroxyl groups with the degree of oxyethylation.

Process for the preparation of elastic flexible polyurethane foams

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Munich, Germany

Reinhard Peters