Anti-foam agent.

摘要

Silicates of the general formula

are used as foam inhibitors in foaming systems. In the above formula, X and Y are the group -OR or a methyl group, R is a polypropylene hydrglycol ether group and, if appropriate, a polyethylene glycol ether group which can be substituted by hydroxyalkyl, aminoalkyl, acyl, acylamino, dihydroxyalkyl and hydroxyaminoalkyl groups having 4 to 24 C atoms. The total number of the glycol ether groups is 1 to 100, the number of the polypropylene glycol ether groups being at least equal to or greater than the number of the ethylene glycol ether groups.