# US 5,705,465 A · Anti-foam system for automatic dishwashing compositions

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- Number: US 5,705,465 A
- Document ID: US5705465A
- Status: Granted
- Kind: A
- Application number: 08/539,923
- Filed: 1995-10-06
- Granted: 1998-01-06
- Earliest claimed: 1995-10-06
- Assignees: Lever Brothers Company, Division of Conopco, Inc.
- Inventors: Petrus Adrianus Angevaare; Alla Tartakovsky
- Web page: https://patentgrep.com/patent/US5705465A

## CPC

- C11D 10/04: based on mixtures of surface-active non-soap compounds and soap
- C11D 1/37: Mixtures of compounds all of which are anionic
- C11D 1/83: Mixtures of non-ionic with anionic compounds
- C11D 3/0026: {Low foaming or foam regulating compositions}
- C11D 3/2072: {Aldehydes-ketones}
- C11D 3/386: Preparations containing enzymes {, e.g. protease or amylase}
- C11D 3/3902: {combined with specific additives}
- C11D 3/3951: {combined with specific additives}
- C11D 1/04: Carboxylic acids or salts thereof (soap C11D9/00)
- C11D 1/14: derived from aliphatic hydrocarbons or mono-alcohols
- C11D 1/22: derived from aromatic compounds
- C11D 1/28: Sulfonation products derived from fatty acids or their derivatives, e.g. esters, amides
- C11D 1/29: Sulfates of polyoxyalkylene ethers
- C11D 1/662: {Carbohydrates or derivatives}
- C11D 1/72: Ethers of polyoxyalkylene glycols
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

An automatic dishwashing detergent composition is described which comprises 0.01 to 1.0% of a fatty acid having from 12 to 22, preferably from 16 to 18, carbon atoms in the acyl radical and are preferably unsaturated; 0.1 to 2% of a carrier containing a ketone which has at least 25 carbon atoms; 0.5 to 40% of a surfactant; 0.1 to 10 weight % of a proteolytic enzyme; 1 to 30 weight % of a bleaching agent selected from the group of a peroxygen or hypohalite agent; and 1 to 75% of a builder providing a composition having a pH of less than about 11. Specifically, the detergent composition must have a weight ratio of long-chain ketone/carrier to fatty acid of 5:1 to 1:1, preferably from 4:1 to 2:1. A method of using the composition is also described.

## Claims

### Claim 1

An automatic dishwashing composition which substantially inhibits foam production in a dishwasher comprising:
a) an anti-foam system comprising of 0.01 to 1.0 wt. % of the total dishwashing composition (i) a fatty acid and salts thereof having from 16 to 18 carbon atoms, and (ii) 0.1 to 2% of the total dishwashing composition by wt. of a carrier containing a ketone which has at least 25 carbon atoms, the ratio of the carrier containing the ketone to fatty acid being from 5:1 to 1:1,
b) 0.5 to 40 wt. % of a surfactant selected from the group consisting of
(i) an anionic surfactant with a hydrophilic head group which is, or which contains a sulfate or sulfonate group and a hydrophobic portion which is or which contains an alkyl or alkenyl group of 6 to 24 carbon atoms,
(ii) an alkyl glycosides,
(iii) an ethoxylated fatty alcohol of formula
RO(CH.sub.2 CH.sub.2 O).sub.n M
wherein R is an alkyl group of 6 to 16 carbon atoms and n has an average value which is at least four and such that the HLB of the ethoxylated fatty alcohol is 10.5 or greater;
c) 0.1 to 10 wt. % of a proteolytic enzyme,
d) 1 to 30 wt. % of a bleaching agent selected from a group of a peroxygen agent, a hypohalite agent and its corresponding salts and mixtures thereof; and
e) 1 to 75 wt. % of a builder,
wherein a 1% aqueous solution of the detergent composition has a pH of less than about 11.

### Claim 2 (depends on 2)

A composition according to claim 2 wherein the fatty acid of the anti-foam system is unsaturated.

### Claim 3 (depends on 1)

A composition according to claim 1 wherein the ketone is obtained by the ketonization of C.sub.16 -C.sub.22 carboxylic acids, carboxylic acid salts and mixtures thereof.

### Claim 4 (depends on 3)

A composition according to claim 3 wherein the ketone is selected from the group consisting of heptacosanone-14, hentriacontanone-16, pentatriacontanone-18, nonatriacontanone-20, triatetracontanone-22 or nonacossanone-15, tri-triacontanone-17, heptatriacontanone-19, hentetracontanone-21 and mixtures thereof.

### Claim 5 (depends on 1)

A composition according to claim 1 wherein the ratio of the carrier containing the ketone to fatty acid is from 4:1 to 2:1.

### Claim 6 (depends on 1)

A composition according to claim 1 wherein the proteolytic enzyme is present in an amount of from 0.3 to 5 wt. %.

### Claim 7 (depends on 1)

A composition according to claim 1 wherein the anionic surfactant is selected from the group consisting of
i) a primary alkyl sulfates having a formula
R.sup.1 OSO.sub.3 M
wherein R.sup.1 is a primary alkyl group of 8 to 18 carbon atoms and M is a solubilizing cation,
ii) an alkyl ether sulfate having a formula
R.sup.1 O(CH.sub.2 CH.sub.2 O).sub.n SO.sub.3 M
wherein R.sup.1 is a primary alkyl group of 8 to 18 carbon atoms, n has an average value in the range from 1 to 6 and M is a solubilizing cation,
iii) a fatty acid ester sulfonate having a formula
R.sup.2 CH(SO.sub.3 M)CO.sub.2 R.sup.3
wherein R.sup.2 is an alkyl group of 6 to 16 atoms, R.sup.3 is an alkyl group of 1 to 4 carbon atoms and M is a solubilizing cation,
iv) an alkyl benzene sulfonate having a formula
R.sup.4 ArSO.sub.3 M
wherein R.sup.4 is an alkyl group of 8 to 18 carbon atoms, Ar is a benzene ring (C.sub.6 H.sub.4) and M is a solubilizing cation.

### Claim 8 (depends on 1)

A composition according to claim 1 wherein the anionic surfactant is a fatty acid ester sulfonate of formula
R.sup.2 CH(SO.sub.3 M)CO.sub.2 R.sup.3
wherein the moiety R.sup.2 CH(--)C02(--) is derived from a coconut source and R.sup.2 is an alkyl group of 6 to 26 atoms and R.sup.3 is either methyl or ethyl.

### Claim 9 (depends on 1)

A composition according to claim 1 wherein the alkyl glycoside is of formula
R.sup.5 O(R.sup.6 O).sub.n (Z.sup.1).sub.p
wherein R.sup.5 is a monovalent organic radical containing from about 6 to about 30 carbon atoms; R.sup.6 is a divalent hydrocarbon radical containing from 2 to about 4 carbon atoms; n is a number having an average value of from 0 to about 12; Z.sup.1 represents a moiety derived from a reducing saccharide containing 5 or 6 carbon atoms; and p is a number having an average value of from 0.5 to about 10.

### Claim 10 (depends on 9)

A composition according to claim 9 wherein group R.sup.5 contains from about 8 to 18 carbon atoms.

### Claim 11 (depends on 9)

A composition according to claim 9 wherein group R.sup.5 contains from about 9 to 13 carbon atoms.

### Claim 12 (depends on 9)

A composition according to claim 9 wherein p has an average value of from 0.5 to about 5.

### Claim 13

A method of washing tableware in an automatic dishwashing machine comprising:
contacting soiled tableware with a detergent composition comprising
a) an anti-foam system comprising (i) 0.01 to 1.0 wt. % of the total dishwashing composition of a fatty acid and salts thereof having from 16 to 18 carbon atoms, and (ii) 0.1 to 2% by wt. of the total dishwashing composition of a carrier containing a ketone having at least 25 carbon atoms, the ratio of ketone/carrier to fatty acid being from 5:1 to 1:1,
b) 0.5 to 40 wt. % of a surfactant selected from the group consisting of
(i) an anionic surfactant with a hydrophilic head group which is, or which contains a sulfate or sulfonate group and a hydrophobic portion which is or which contains an alkyl or alkenyl group of 6 to 24 carbon atoms,
(ii) an alkyl glycosides,
(iii) an ethoxylated fatty alcohol of formula
RO(CH.sub.2 CH.sub.2 O).sub.n M
wherein R is an alkyl group of 6 to 16 carbon atoms and n has an average value which is at least four such that the HLB of the ethoxylated fatty alcohol is 10.5 or greater,
and mixtures thereof,
c) 0.1 to 10 wt. % of a proteolytic enzyme,
d) 1 to 30 wt. % of a bleaching agent selected from a group of a peroxygen agent, a hypohalite agent and its corresponding salts and its mixtures thereof, and
e) 1 to 75 wt. % of a builder,
to substantially clean the tableware and to substantially inhibit foam formation.

### Claim 14 (depends on 13)

A method according to claim 13 wherein the fatty acid of the anti-foam system is unsaturated.

### Claim 15 (depends on 13)

A method according to claim 13 wherein the ketone is obtained by the ketonization of C.sub.16 -C.sub.22 carboxylic acids, carboxylic acid salts and mixtures thereof.

### Claim 16 (depends on 15)

A method according to claim 15 wherein the ketone is selected from the group consisting of heptacosanone-14, hentriacontanone-16, pentatriacontanone-18, nonatriacontanone-20, triatetracontanone-22 or nonacossanone-15, tri-triacontanone-17, heptatriacontanone-19, hentetracontanone-21 and mixtures thereof.