US 5,895,605 AGranted

Defoaming compositions

AssigneeHenkel Corporation

InventorsStephen F. Gross, Michael S. Wiggins, Ronald W. Broadbent, David I. Devore

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Abstract

Defoamers are the products of the reaction of epichlorohydrin and compounds having the formula II R.sub.3 (EO).sub.n (PO).sub.m OH (II) wherein R.sub.3 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.

Claims8

Dependent claims

An aqueous surfactant composition comprising

A) at least one compound of the formula I
R.sub.1 O(R.sub.2 O).sub.p (Z).sub.a I
wherein R.sub.1 is a monovalent organic radical having from about 6 to about 30 carbon atoms;
R.sub.2 is a divalent alkylene radical having from 2 to 4 carbon atoms;
Z is a saccharide residue having 5 or 6 carbon atoms;
b is a number having a value from 0 to about 12;
a is a number having a value from 1 to about 6;
and
B) a foam reducing quantity of at least one reaction product consisting of the base catalyzed reaction product of epichlorohydrin and a compound of the formula II
R.sub.3 (EO).sub.n (PO).sub.m OH II
wherein R.sub.3 is an alkyl, alkenyl or arenyl group having from 4 to 22 carbon atoms;
EO represents an ethylene oxide group;
PO represents a propylene oxide group;
n is a number from 2 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.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/923,868Filed 4 Sep 1997 · continuation
Priority: 14 Jan 1997
Granted: 20 Apr 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B01D 19/0404
By addition of chemical substances: characterised by the nature of the chemical substance
B01D 19/0427
Characterised by the nature of the chemical substance: compounds containing halogen-atoms
B01D 19/0431
Characterised by the nature of the chemical substance: containing aromatic rings
C08G 65/24
Cyclic ethers having at least one atom other than carbon and hydrogen outside the ring: epihalohydrins