Defoaming agent

Claim 2

Defoaming agent comprising (a) from 1 to 100 parts by weight of at least one alkali-metal salt of an oxy-acid of sulphur, nitrogen or phosphorous selected from the group consisting of neutral or acidic alkali-metal salts of sulphurous acid, dithionous acid, thiosulphuric acid, pyrosulphuric acid, or of nitric acid or nitrous acid, or of phosphoric acid, phosphorous acid, diphosporous acid, hypophosphorous acid and hypodiphosphorous acid, (b) from 20 to 1 parts by weight of at least one aliphatic hydrocarbon having up to about 60 carbon atoms or a derivative thereof having up to 26 carbon atoms selected from the group consisting of fatty acids, a fatty acid ester, fatty acid salts, fatty acid amides, alcohols, amines, aldehydes and ketones, (c) from 0 to 5 parts by weight, based on 100 parts by weight of (a + b), an additive or processing aid, and (d) from 0 to 1000 parts by weight, based on 100 parts by weight of (a + b), water.

Claim 3

The defoaming agent of claim 1 wherein said alkali-metal salt (a) is sodium sulphite, sodium nitrite or sodium phosphite.

Claim 4

The defoaming agent of claim 1 wherein said aliphatic hydrocarbon (b) is an aliphatic, saturated or unsaturated hydrocarbon having up to about 60 carbon atoms.

Claim 5

The defoaming agent of claim 3 wherein said hydrocarbon is paraffin oil.

Claim 6

The defoaming agent of claim 1 wherein said fatty acid is a saturated fatty acid containing from 4 to 26 carbon atoms.

Claim 7

The defoaming agent of claim 5 wherein said saturated fatty acid is butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, benhenic acid, lignoceric acid or cerotic acid.

Claim 8

The defoaming agent of claim 6 wherein said saturated fatty acid is caprylic or stearic acid.

Claim 9

The defoaming agent of claim 1 wherein said fatty acid is an unsaturated fatty acid containing from 4 to 26 carbon atoms.

Claim 10

The defoaming agent of claim 8 wherein said unsaturated fatty acid is obtusilic acid, caproleic acid, lauroleic acid, physeteric acid, myristoleic acid, palmitoleic acid, petroselic acid, oleic acid, vaccenic acid, gadoleic acid, cetoleic acid, erucic acid, ximenic acid, linolic acid, linoleic acid, eleostearic acid, parinaric acid, arachidonic acid, clupanodonic acid or nisinic acid.

Claim 11

The defoaming agent of claim 9 wherein said unsaturated fatty acid is oleic, erucic or lauroleic acid.

Claim 12

The defoaming agent of claim 1 wherein said fatty acid ester is a glycerol fatty acid ester.

Claim 13

The defoaming agent of claim 1 wherein said fatty acid ester is an alkoxylated fatty acid whereby the number of alkoxy units is from 1 to 20.

Claim 14

The defoaming agent of claim 12 wherein the number of alkoxy units is from 2 to 10.

Claim 15

The defoaming agent of claim 13 wherein the number of alkoxy units is from 2 to 6.

Claim 16

The defoaming agent of claim 12 wherein said fatty acid ester is an ethoxylated fatty acid.

Claim 17

The defoaming agent of claim 12 wherein said fatty acid ester is a polyglycol oleic acid ester.

Claim 18

The defoaming agent of claim 16 wherein said fatty acid ester is a polyethylene glycol oleic acid ester.

Claim 19

The defoaming agent of claim 1 wherein said fatty acid salt is an alkali-metal or an alkaline-earth metal salt.

Claim 20

The defoaming agent of claim 18 wherein said alkali-metal fatty acid salt is a sodium salt.

Claim 21

The defoaming agent of claim 1 wherein said fatty acid amide is derived from a saturated or unsaturated fatty acid containing from 4 to 26 carbon atoms.

Claim 22

The defoaming agent of claim 20 wherein said fatty acid contains from 4 to 22 carbon atoms.

Claim 23

The defoaming agent of claim 21 wherein said fatty acid contains from 16 to 18 carbon atoms.

Claim 24

The defoaming agent of claim 20 wherein said saturated fatty acid is butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid or cerotic acid.

Claim 25

The defoaming agent of claim 23 wherein said fatty acid amide is lauric acid diethanolamide.

Claim 26

The defoaming agent of claim 20 wherein said unsaturated fatty acid is obtusilic acid, caproleic acid, lauroleic acid, physeteric acid, myristoleic acid, palmitoleic acid, petroselic acid, oleic acid, vaccenic acid, gadoleic acid, cetoleic acid, erucic acid, ximenic acid, linolic acid, linoleic acid, eleostearic acid, parinaric acid, arachidonic acid, clupanodonic acid or nisinic acid.

Claim 27

The defoaming agent of claim 1 wherein said alcohol is a saturated or unsaturated, aliphatic, monohydric or polyhydric alcohol containing from 1 to 22 carbon atoms.

Claim 28

The defoaming agent of claim 26 wherein said alcohol has from 3 to 8 carbon atoms.

Claim 29

The defoaming agent of claim 26 wherein said alcohol is ethanol, amyl alcohol or glycerol.

Claim 30

The defoaming agent of claim 1 wherein said amine is derived from an unsaturated or saturated, aliphatic monohydric or polyhydric alcohol containing from 1 to 22 carbon atoms by substituting the hydroxy function by an amino function.

Claim 31

The defoaming agent of claim 29, wherein said amine contains from 5 to 18 carbon atoms.

Claim 32

The defoaming agent of claim 30 wherein said amine is stearyl amine or oleylamine.

Claim 33

The defoaming agent of claim 29 wherein said alcohol is ethanol, amyl alcohol or glycerol.

Claim 34

The defoaming agent of claim 1 wherein said aldehyde is derived from a saturated or unsaturated fatty acid containing from 4 to 26 carbon atoms by substituting the hydroxy group of the carboxy function by a hydrogen atom.

Claim 35

The defoaming agent of claim 33 wherein said aldehyde contains from 5 to 12 carbon atoms.

Claim 36

The defoaming agent of claim 34 wherein said aldehyde is heptanal, butene-2-al-1, or 2-ethylhexene-2-al-1.

Claim 37

The defoaming agent of claim 33 wherein said saturated fatty acid is butyric acid, caproic acid, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, lignoceric acid, or cerotic acid.

Claim 38

The defoaming agent of claim 33 wherein said unsaturated fatty acid is obtusilic acid, caproleic acid, lauroleic acid, physeteric acid, myristoleic acid, palmitoleic acid, petroselic acid, oleic acid, vaccenic acid, gadoleic acid, cetoleic acid, erucic acid, ximenic acid, linolic acid, linoleic acid, eleostearic acid, parinaric acid, arachidonic acid, clupanodonic acid or nisinic acid.

Claim 39

The defoaming agent of claim 1 wherein said ketone contains from 6 to 9 carbon atoms.

Claim 40

The defoaming agent of claim 38 wherein said ketone is hexanone-3, diisopropyl ketone or isophorone.

Claim 41

The defoaming agent of claim 1 wherein from 3 to 40 parts by weight, of component (a) are contained on 1 part by weight of component (b).

Claim 42

The defoaming agent of claim 40 wherein from 10 to 20 parts by weight of component (a) are contained on 1 part by weight of component (b).

Claim 43

Process for controlling foam by adding, either sequentially or in combination, an effective amount of (a) 1 to 100 parts by weight of at least one alkali-metal salt of an oxy-acid of sulphur, nitrogen or phosphorus, selected from the group consisting of neutral or acidic alkali-metal salts of sulphurous acid. dithionous acid, thiosulphuric acid, pyrosulphurous acid or sulphoxylic acid, or of nitric acid or nitrous acid, or of phosphoric acid, phosphorous acid, diphosphorous acid, hypophosphorous acid and hypodiphosphorous acid, (b) 20 to 1 parts by weight of at least one aliphatic hydrocarbon having up to 60 carbon atoms or a derivative thereof having up to 26 carbon atoms selected from the group consisting of fatty acids, a fatty acid ester, fatty acid salts, fatty acid amides, alcohols, amines, aldehydes and ketones, and (c) 0 to 5 parts by weight, based on 100 parts by weight (a + b), of an additive or processing aid to the medium to be defoamed.

Claim 44

Process for controlling foam by adding, either sequentially or in combination, an effective amount of (a) 1 to 100 parts by weight of at least one alkali-metal salt of an oxy-acid of sulphur, nitrogen or phosphorus, selected from the group consisting of neutral or acidic alkali-metal salts of sulphurous acid. dithionous acid, thiosulphuric acid, pyrosulphurous acid or sulphoxylic acid, or of nitric acid or nitrous acid, or of phosphoric acid, phosphorous acid, diphosphorous acid, hypophosphorous acid and hypodiphosphorous acid, (b) 20 to 1 parts by weight of at least one aliphatic hydrocarbon having up to 60 carbon atoms or a derivative thereof having up to 26 carbon atoms selected from the group consisting of fatty acids, a fatty acid ester, fatty acid salts, fatty acid amides, alcohols, amines, aldehydes and ketones, and (c) 0 to 5 parts by weight, based on 100 parts by weight (a + b), of an additive or processing aid to the medium to be defoamed.

Claim 45

The process of claim 42 wherein said components (a) and (b) are in an aqueous solution or dispersion.