Defoamers for aqueous systems
AssigneeCognis Corporation
InventorsMichael S. Wiggins, Ronald W. Broadbent
Life of this patent
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Abstract
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 50; wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1 are used in defoaming compositions for defoaming aqueous systems such as latex paints.
Claims44
A process for reducing or preventing foam in an aqueous system comprising adding to the aqueous system from about 0.001% to about 10.0% by weight of a composition which is the product of the process which comprises reacting epichlorohydrin and a compound of the formula II
- R3(EO)n(PO)mOH (II)
- wherein R3 is a saturated or unsaturated organic group having from 4 to 22 carbon atoms;
- n is a number from 0 to 50 and m is a number from 0 to 50;
- wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1.
A process for reducing or preventing foam in an aqueous system comprising adding to the aqueous system from about 0.01% to about 10% by weight of a composition comprised of:
- (a) the product of the process which comprises reacting epichlorohydrin and a compound of the formula II
- R3(EO)n(PO)mOH (II)
- wherein R3 is a saturated or unsaturated organic group having from 4 to 22 carbon atoms;
- n is a number from 0 to 50 and m is a number from 0 to 50;
- wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1;
- and (b) a water-insoluble liquid carrier capable of dissolving or dispersing component (a).
A process for reducing or preventing foam in an aqueous system comprising adding to the aqueous system from about 0.1% to about 10% by weight of a composition comprised of (a) the product of the process which comprises reacting epichlorohydrin and a compound of the formula II
- R3(EO)n(PO)mOH (II)
- wherein R3 is a saturated or unsaturated organic group having from 4 to 22 carbon atoms;
- n is a number from 0 to 50 and m is a number from 0 to 50;
- wherein the mole ratio of epichlorohydrin to (II) is from about 0.60/1 to about 2/1;
- (b) a hydrophobic solid;
- and (c) a water-insoluble liquid carrier capable of dissolving or dispersing component (a).
Dependencies are inferred from the claim text.