US 6,472,440 B2 · Defoaming compositions

Abstract

Defoamers are the products of the reaction of epichlorohydrin and compounds having the formula II R3(EO)n(PO)mOH (II) wherein R3 is an alkyl, alkenyl or arenyl group having from 4 to 22 carbon atoms; a substituted alkyl or alkenyl group having from 4 to 22 carbon atoms wherein; n is a number from 0 to 50 and m is a number from 0 to 10; wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1 are extremely efficient defoamers for aqueous surfactant systems. The defoamers are added to a surfactant in an amount sufficient to reduce or eliminate foam and have the advantage of being totally dispersible in water, are readily biodegradable, contain no organic solvents and do not affect the detergency of surfactants with which they are used because they are nonionic surfactants in themselves.

Claims13

Dependent claims

An aqueous surfactant composition consisting essentially of:

A) a foam reducing quantity of at least one surfactant which is a reaction product consisting essentially of the base catalyzed reaction product of epichlorohydrin and a compound of the formula II
R3(EO)n(PO)mOH (II)
wherein R3 is a saturated or unsaturated aliphatic group having from 4 to 22 carbon atoms, a carbocyclic group or a heterocyclic group;
EO represents an ethylene oxide group;
PO represents a propylene oxide group;
n is a number from 0 to 50 and m is a number from 0 to 10;
and wherein the mole ratio of epichlorohydrin to (II) is from 0.6/1 to about 2/1;
and
B) at least one surfactant other than component A), and when B) is one or more alkyl polyglycosides, the weight ratio of component B) to component A) is from about 4.0:1 to about 1.0:10.

6 more elements

Dependencies are inferred from the claim text.

Defoaming compositions

Life of this patent

Defoaming compositions

Life of this patent

Abstract

Claims13