Henkel Kommanditgesellschaft Auf Aktien

Hans U Hempel

Holger Tesmann

Heinz Mueller

Adolf Asbeck

Herbert Reuter

Edmund Schmadel

Gunther Vogt

Margarete Gruenert

Substantially water-insoluble silicic acid esters corresponding to the following general formula ##STR1## are used to foam inhibitors in foaming systems. In the above formula, X and Y represent the group --OR or a methyl group, R represents a polypropylene glycol ether group and, optionally, a polyethylene glycol ether group which may be substituted by alkoxyl, amino-alkyl, acyl, acylamino, dialkoxyl and oxyaminoalkyl groups containing from 4 to 24 carbon atoms. The total number of glycol ether groups amounts to between 1 and 100, the number of polypropylene glycol ether groups preferably being at least equal to or larger than the number of ethylene glycol ether groups.

Defoaming agents and process of defoaming

This invention is directed to a method of preparing block copolymers useful as foam inhibitors, which method comprises the steps of:

Preparation of polysiloxane block polymers and their use as foam

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Vilkerath, Germany

Hans U Hempel