AU725542B2 - Foam cleaning compositions - Google Patents

Description

1 FOAM CLEANING COMPOSITIONS Background of the Invention A major problem existing in households is the presence of house dust mites which release allergens. Dust mites flourish in textile materials such as carpets, upholstered chairs and mattresses.

U.S. Patent 4,666,940 teaches a textile cleaning composition containing benzyl benzoate as an acaricidal agent, a surfactant and a polymeric material.

European Patent No. 17,315 has disclosed that normal insecticides, such as pyrethrins or DDT, are relatively ineffective against house dust mites.

According to this patent specification, benzyl benzoate is regarded as a suitable active substance, and the aim of that patent is to diminish a disadvantage of this compound, namely the relatively high vapor pressure, in order to achieve longer retention of the substance. For this purpose, combinations of the benzyl benzoate with fatty acid esters and a fungicidal agent in a nonaqueous preparation are proposed therein.

British Patent No. 1,368,657, teaches the adding of nonvolatile polyalkylene glycols or nonvolatile ethers or esters to benzyl benzoate.

However, this has caused considerable disadvantages in the use of the beds, 20 and these are documented in detail in European Patent No. 17,315. In both literature references, the carrier substances used are volatile organic solvents.

It is desirable to provide a foam composition which is effective in killing dust mites and that the treating foam composition be readily removed from the treated surface by post vacuuming.

Summary of the Invention S" The present invention relates to a foam composition which is effective in killing dust mites. The foam composition contains a polyacrylate polymer, a hydrocarbon propellant, an ether type solvent, benzyl salicylate which is an acaricidal agent, a surfactant, a hydrotrope, perfume, an anticorrision agent and water, wherein the composition does not contain benzyl benzoate.

WO 98/21954 PCT/US97/21300 Detailed Description of the Invention The present invention relates to a foam composition for killing dust mites which comprises by weight: 0.5% to 10%, more preferably 1% to 8% of a polyacrylate polymer having a molecular weight of 100,000 to 900,000; 2% to 10%, more preferably 3% to 8% of a hydrocarbon propellant which can be a mixture of isobutane and propane; 0.5% to more preferably 0.75% to 3% of pentasodium triphosphate; 0.5% to more preferably 0.75% to 2% of an ether solvent; 0.1% to more preferably 0.5% to 4% of benzyl salicylate; 0.1% to more preferably 0.25% to 2% of at least one surfactant; 0.1% to more preferably 0.25% to 2% of a hydrotrope; 0.1% to more preferably 0.2% to 0.8% of a perfume; 0.01% to more preferably 0.02% to 0.2% of an anticorrision agent; and the balance being water, wherein the foam composition does not contain benzyl benzoate.

The polyacrylate polymer useful in the instant invention has a molecular weight of 100,000 to 900,000, more preferably 200,000 to 700,000. A preferred polymer is Ubatol VTR455 which is manufactured by Cray Valley and is an aqueous emulsion of a polyacrylate polymer which contains 24 wt. of polyacrylate polymer, 10 wt. of a paraffin sulfonate surfactant and the balance being water.

The propellant gas mixture can be any conventionally employed propellant gas but a preferred mixture is isobutane and propane in a weight ratio of 6:1 to 1:1.

The ether solvents used in the instant compositions are glycol ethers such as ethylene glycol monobutyl ether (butyl cellosolve), diethylene glycol monobutyl ether (butyl carbitol), triethylene glycol monobutyl ether, mono, di, tri propylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, mono, di, tripropylene glycol monomethyl ether, propylene glycol monomethyl ether, ethylene glycol monohexyl 9 nolnr A PrT/ITS Q'71 inn 70l &17..Pt 3 ether, diethylene glycol monohexyl ether, propylene glycol tertiary butyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, ethylene glycol monopropyl ether, ethylene glycol monopentyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene 5 glycol monopentyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monopropyl ether, triethylene glycol monopentyl ether, triethylene glycol monohexyl ether, mono, di, tripropylene glycol monoethyl ether, mono, di tripropylene glycol monopropyl ether, mono, di, tripropylene glycol monopentyl ether, mono, di, tripropylene glycol monohexyl ether, mono, di, tributylene o1 glycol mono methyl ether, mono, di, tributylene glycol monoethyl ether, mono, di, tributylene glycol monopropyl ether, mono, di, tributylene glycol monobutyl ether, mono, di, tributylene glycol monopentyl ether and mono, di, tributylene glycol monohexyl ether, ethylene glycol monoacetate and dipropylene glycol propionate.

The anionic sulfonate surfactants which may be used in the compositions of this invention are water soluble and include the sodium, potassium, ammonium and ethanolammonium salts of linear C8-C16 alkyl benzene sulfonates; C10-C20 paraffin sulfonates, alpha olefin sulfonates containing 10-24 carbon atoms and C8-C18 alkyl sulfates and mixtures thereof. The preferred anionic sulfonate surfactants are a paraffin sulfonate or alkyl benzene sulfonate.

The paraffin sulfonates may be monosulfonates or di-sulfonates and usually are mixtures thereof, obtained by sulfonating paraffins of 10 to 20 carbon atoms. Preferred paraffin sulfonates are those of C12-18 carbon atoms chains, and more preferably they are of C14-17 chains. Paraffin sulfonates that have the sulfonate group(s) distributed along the paraffin chain are described in U.S. Patents 2,503,280; 2,507,088; 3,260,744; and 3,372,188; and also in German Patent 735,096. Such compounds may be made to specifications and desirably the content of paraffin sulfonates outside the C14-17 range will be minor and will be minimized, as will be any contents of di- or polysulfonates.

WO 98/21954 PCTIS97/21300 4- Examples of suitable other sulfonated anionic detergents are the well known higher alkyl mononuclear aromatic sulfonates, such as the higher alkylbenzene sulfonates containing 9 to 18 or preferably 9 to 16 carbon atoms in the higher alkyl group in a straight or branched chain, or C8-15 alkyl toluene sulfonates. A preferred alkylbenzene sulfonate is a linear alkylbenzene sulfonate having a higher content of 3phenyl (or higher) isomers and a correspondingly lower content (well below 50%) of 2phenyl (or lower) isomers, such as those sulfonates wherein the benzene ring is attached mostly at the 3 or higher (for example 4, 5, 6 or 7) position of the alkyl group and the content of the isomers in which the benzene ring is attached in the 2 or 1 o1 position is correspondingly low. Preferred materials are set forth in U.S. Patent 3,320,174, especially those in which the alkyls are of 10 to 13 carbon atoms.

The C8-18 ethoxylated alkyl ether sulfate surfactants have the structure R-(OCHCH2)nOSO3M wherein n is 1 to 22 more preferably 1 to 3 and R is an alkyl group having 8 to 18 carbon atoms, more preferably 12 to 15 and natural cuts, for example, C12-14 or C12- 16 and M is an ammonium cation or a metal cation, most preferably sodium. The ethoxylated alkyl ether sulfate is present in the composition at a concentration of 8 to wt. more preferably 10 to 18 wt. The ethoxylated alkyl ether sulfate may be made by sulfating the condensation product of ethylene oxide and C8-10 alkanol, and neutralizing the resultant product.

The ethoxylated alkyl ether sulfates differ from one another in the number of carbon atoms in the alcohols and in the number of moles of ethylene oxide reacted with one mole of such alcohol. Preferred ethoxylated alkyl ether polyethenoxy sulfates contain 12 to 15 carbon atoms in the alcohols and in the alkyl groups thereof.

Ethoxylated C8-18 alkylphenyl ether sulfates containing from 1 to 6 moles of ethylene oxide in the molecule are also suitable for use in the invention compositions.

These detergents can be prepared by reacting an alkyl phenol with 1 to 6 moles of ethylene oxide and sulfating and neutralizing the resultant ethoxylated alkylphenol.

The concentration of the ethoxylated alkyl ether sulfate surfactant is 8 to 20 wt. WO 98/21954 PCT/US97/21300 I In I iiaiIL uusipuiiiun can also contain a zwitterionic surtactant and/or an amine oxide surfactant at a concentration of 0 to 6.0 wt. more preferably 0.5 to wt.%.

The zwitterionic surfactants are water soluble betaine having the general formula' R2 I

R

1 -N-R4-X R3 wherein X- is selected from the group consisting of SO3" and C02~ and R 1 is an alkyl group having 10 to 20 carbon atoms, preferably 12 to 16 carbon atoms, or the amido radical: O H II II -N CH2)wherein R5 is an alkyl group having 9 to 19 carbon atoms and a is the integer 1 to 4;

R

2 and R 3 are each alkyl groups having 1 to 3 carbons and preferably 1 carbon; R 4 is an alkylene or hydroxyalkylene group having from 1 to 4 carbon atoms and, optionally, one hydroxyl group. Typical alkyldimethyl betaines include decyl dimethyl betaine or 2- (N-decyl-N, N-dimethyl-ammonia) acetate, coco dimethyl betaine or 2-(N-coco N, Ndimethylammonia) acetate, myristyl dimethyl betaine, palmityl dimethyl betaine, lauryl dimethyl betaine, cetyl dimethyl betaine, stearyl dimethyl betaine, etc. The amidobetaines similarly include cocoamidoethylbetaine, cocoamidopropyl betaine and the like. Preferred betaines are coco (C 8

-C

18 amidopropyl dimethyl betaine and lauryl dimethyl betaine.

The amine oxides are semi-polar nonionic surfactants which comprise compounds and mixtures of compounds having the formula: R7 1 R6(C2H40)nN0 Rg WO 98/21954 PCT/US9721300 6 wherein R 6 is an alkyl, 2-hydroxyalkyl, 3-hydroxyalkyl, or 3-alkoxy-2-hydroxypropyl radical in which the alkyl and alkoxy, respectively, contain from 8 to 18 carbon atoms,

R

7 and R 8 are each methyl, ethyl, propyl, isopropyl, 2-hydroxyethyl, 2-hydroxypropyl, or 3-hydroxypropyl, and n is from 0 to 10. Particularly preferred are amine oxides of the formula: R g-N---0 R11 wherein R 9 is a C12-16 alkyl group or amido radical: R12- N-C H2)awherein R 1 is an alkyl group having 9 to 19 carbon atoms and a is an integer 1 to 4 and R 1 0 and R 1 1 are methyl or ethyl. The above ethylene oxide condensates, amides, and amine oxides are more fully described in U.S. Pat. No. 4,316,824 which is hereby incorporated herein by reference.

Nonionic surfactants or lauryl myristyl monoethanolamide can be used at a concentration of 0 to 5 wt. more preferably 0.5 to 2.0 wt. in the instant compositions.

The hydrotropes useful in the instant invention are sodium xylene sulfonate or sodium cumene sulfonate. The acaricidal agent which is useful in the instant invention is benzyl salicylate.

The anticorrision agents are selected from the group consisting of sodium nitrate, sodium silicate, sodium sarcosinate, sodium sulfosuccinate, sodium phosphate and sodium borate.

The following examples illustrate foam cleaning compositions of the described invention. Unless otherwise specified, all percentages are by weight. The exemplified compositions are illustrative only and do not limit the scope of the invention. Unless

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otherwise specified, the proportions in the examples and elsewhere in the specification are by weight.

Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

[0 Example 1 The following compositions in wt.% were prepared at 25°C by simple mixing:

A

Polyacrylate polymer Ubatol VTR 455 3.84 Sodium C,,-C 17 paraffin sulfonate 1.6 Pentasodium triphosphate 2.2 Perfume 0.3 Sodium silicate 0.2 Lauryl myristyl monoethanol amide Sodium xylene sulfonate 0.3 Water Bal.

Diethylene glycol monobutyl ether Benzyl salicylate Isobutane 4.63 Propane 0.87 Contact time with mites minutes dead mites 100 dead mites 3 h after carpet treatment 89.9 24 h after carpet treatment 91 96 h after carpet treatment 92 The acaricidal test for mites is done in liquid medium in 24 wells plastic plates. 30 living mites are placed in the well with the nourishing 7A culture medium and then covered with either water (background values) or the neat foam cleaner (or any other liquid product to be tested) in water and left in contact for various contact times. The remaining living mites are counted by observation under the microscope after the envisaged contact time. Contact times with mites can be 5 minutes up to 3 hours. When the foam for carpet has been found acaricidal in the direct test, the test is repeated on carpet pieces. Carpet pieces are infested with a known amount (80-100) of dust mites and let to settle for 1 hour. Carpet pieces are then treated with the acaricidal foam and the remaining living mites are counted by visual observation after 3 hours, 24 hours and 96 hours. The examination can be extended up to 7 days after the treatment.

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Claims (5)

1. A foam composition comprising approximately by weight: 0.5% to 10 of a polyacrylate polymer; 2% to 10% of a hydrocarbon propellant; 0.5% to 5% of a pentasodium triphosphate; 0.5% to 3% of an ether solvent; 0.1% to 5% of benzyl salicylate; 0.1% to 5% of a surfactant; 0.1% to 3% of a hydrotrope; 0.1% to 1 of a perfume; 0.01% to 5% of an anticorrision agent; and the balance being water, wherein the composition does not contain benzyl benzoate.

2. The composition according to Claim 1 wherein said surfactant is an anionic surfactant.

3. The composition according to Claim 2 further including a zwitterionic surfactant.

4. The composition according to Claim 2 further including a nonionic surfactant.

5. The composition according to any one of claims 1 to 4 wherein said hydrocarbon propellant is a mixture of propane and isobutane. Dated this twenty sixth day of July 2000. Colgate-Palmolive Company Patent Attorneys for the Applicant: F B RICE CO FBRICE&CO