NZ535881A

NZ535881A - Liquid dish cleaning compositions having improved preservative system

Info

Publication number: NZ535881A
Application number: NZ535881A
Authority: NZ
Inventors: Julien Drapier; Baudouin Mertens
Original assignee: Colgate Palmolive Co
Priority date: 2002-03-27
Filing date: 2003-03-26
Publication date: 2007-11-30
Also published as: WO2003083024A1; ECSP045388A; MXPA04009295A; IL164305A0; DK1487947T3; EP1487947A1; AU2003222062B2; DE60305463D1; CA2480327C; ATE327305T1; PL372575A1; NO20044541L; PT1487947E; CA2480327A1; EP1487947B1; PL202766B1; AU2003222062A1; DE60305463T2; ES2262991T3

Abstract

Disclosed is a liquid dish cleaning composition which comprises approximately by weight: (a) 5% to 15% of at least one anionic surfactant selected from the group consisting of linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1% to 4% of a polyethylene glycol; (d) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantion, an isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (e) 0.01 % to 1.5% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S, S ethylene diamine-N,N'-disuccinate, and tetra sodium imino disuccinate; and (f) the balance being water. Also disclosed is a liquid dish cleaning composition which comprises approximately by weight: (a) 15% to 35% of at least one anionic sulfonate surfactant selected from the group consisting of a linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1% to 10% of at least one ethoxylated nonionic surfactant; (d) 0.1% to 4% of a polyethylene glycol; (e) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantion, an isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (f) 0.01 % to 1.5% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S,S ethylene diamine-N,N'-disuccinate and tetra sodium iminodisuccinate; and (g) the balance being water.

Description

<div class="application article clearfix" id="description"> New Zealand Paient Spedficaiion for Paient Number 535881 ' ^ % s WO 03/083024 PCT/US03/09038 LIQUID DISH CLEANING COMPOSITIONS HAVING IMPROVED PRESERVATIVE SYSTEM 5 Field of Invention This invention relates to a liquid dish cleaning composition which is designed to have good foaming grease cutting, rinsing and mildness properties and an improved 10 preservative system. Background of the Invention The present invention relates to novel light duty liquid detergent compositions with high foaming and good grease cutting properties and an improved preservative system. 15 The prior art is replete with light duty liquid detergent compositions containing nonionic surfactants in combination with anionic and/or betaine surfactants wherein the nonionic detergent is not the major active surfactant. In U.S. Patent No. 3,658,985 an anionic based shampoo contains a minor amount of a fatty acid alkanolamide. U.S. Patent No. 3,769,398 discloses a betaine-based shampoo containing minor amounts of 20 nonionic surfactants. This patent states that the low foaming properties of nonionic detergents renders its use in shampoo compositions non-preferred. U.S. Patent No. 4,329,335 also discloses a shampoo containing a betaine surfactant as the major ingredient and minor amounts of a nonionic surfactant and of a fatty acid mono- or di-ethanolamide. U.S. Patent No. 4,259,204 discloses a shampoo comprising 0.8 to 20% 25 by weight of an anionic phosphoric acid ester and one additional surfactant which may be either anionic, amphoteric, or nonionic. U.S. Patent No. 4,329,334 discloses an anionic-amphoteric based shampoo containing a major amount of anionic surfactant and lesser amounts of a betaine and nonionic surfactants. WO 03/083024 PCT/US03/09038 2 U.S. Patent No. 3,935,129 discloses a liquid cleaning composition containing an alkali metal silicate, urea, glycerin, triethanolamine, an anionic detergent and a nonionic detergent. The silicate content determines the amount of anionic and/or nonionic detergent in the liquid cleaning composition. However, the foaming properties of these 5 detergent compositions are not discussed therein. U.S. Patent No. 4,129,515 discloses a heavy duty liquid detergent for laundering fabrics comprising a mixture of substantially equal amounts of anionic and nonionic surfactants, alkanolamines and magnesium salts, and, optionally, zwitterioriic surfactants as suds modifiers. 10 U.S. Patent No. 4,224,195 discloses an aqueous detergent composition for laundering socks or stockings comprising a specific group of nonionic detergents, namely, an ethylene oxide of a secondary alcohol, a specific group of anionic detergents, namely, a sulfuric ester salt of an ethylene oxide adduct of a secondary alcohol, and an amphoteric surfactant which may be a betaine, wherein either the 15 anionic or nonionic surfactant may be the major ingredient. The prior art also discloses detergent compositions containing all nonionic surfactants as shown in U.S. Patent Nos. 4,154,706 and 4,329,336 wherein the shampoo compositions contain a plurality of particular nonionic surfactants in order to affect desirable foaming and detersive properties despite the fact that nonionic 20 surfactants are usually deficient in such properties. U.S. Patent No. 4,013,787 discloses a piperazine based polymer in conditioning and shampoo compositions which may contain all nonionic surfactant or all anionic surfactant. U.S. Patent No. 4,450,091 discloses high viscosity shampoo compositions 25 containing a blend of an amphoteric betaine surfactant, a polyoxybutylenepolyoxyethylene nonionic detergent, an anionic surfactant, a fatty acid alkanolamide and a polyoxyalkylene glycol fatty ester. But, none of the exemplified compositions contain an active ingredient mixture wherein the nonionic detergent is 3 present in major proportion which is probably due to the low foaming properties of the polyoxybutylene polyoxyethylene nonionic detergent. U.S. Patent No. 4,595,526 describes a composition comprising a nonionic surfactant, a betaine surfactant, an anionic surfactant and a C12-C14 fatty acid 5 monoethanolamide foam stabilizer. U.S. Patent 6,147,039 teaches an antibacterial hand cleaning composition having a low surfactant content. Summary of the Invention ^ 10 with a magnesium containing inorganic salt, optionally, a sulfate anionic surfactant, at least one sulfonate anionic surfactant, polyethylene glycol, an improved preservative system consisting of a preservative and a preservative potentiator and water, wherein the composition has desirable cleaning and foaming properties and an excellent resistance to bacteria. 15 An object of this invention is to provide a liquid dish cleaning composition which comprises at least one anionic surfactant, a magnesium containing inorganic salt, polyethylene glycol and a preservative system consisting of a preservative and a preservative potentiator, wherein the composition does not contain any silicas, abrasives, acyl isoethionate, 2-hydroxy-4,2',4'-trichloridiphenyl ether, monosuccinic ^20 acids and phosphoric acid and any salts thereof, ethylenediamine tetraacetic acid or any salt thereof, enzymes, zeolite, alkali metal silicates, phosphoric acid, boric acid, alkali metal carbonates, alkaline earth metal carbonates, alkyl glycine surfactant, cyclic imidinium surfactant, or more than 3 wt. % of a fatty acid or salt thereof, or to at least provide the public with a useful choice. 25 Additional objects, advantages and novel features of the invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following or may be learned by practice of the invention. The objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the It has now been found that a liquid dish cleaning composition can be formulated appended claims. 4 Detailed Description of the Invention This invention relates to a liquid dish cleaning composition which comprises approximately by weight: (a) 5% to 15% of at least one anionic surfactant selected from the group consisting of linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1 % to 4% of a polyethylene glycol; (d) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantoin, an isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (e) 0.01 % to 1.5% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S,S ethylene diamine-N.N-dissuccinate, tetra sodium imino disuccinate; and (f) the balance being water. This invention also relates to a liquid dish cleaning composition which comprises approximately by weight: (a) 15% to 35% of at least one anionic sulfonated surfactant selected from the group consisting of a linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1 % to 10% of at least one ethoxylated nonionic surfactant; (d) 0.1 % to 4% of a polyethylene glycol; (e) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantoin, isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (f) 0.01 % to 1.5%, more preferably 0.05% to 1.0% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S,S ethylene diamine-N,N'-disuccinate and tetra sodium iminodisuccinate; and (g) the balance being water. IPONZ 27 SEP 2007 5 00 The compositions of this invention have a pH of 4 to 8 and have a viscosity of 100 to 1,000 cps, more preferably 200 to 600 cps at 25°C as measured on a Brookfield RVTDV-II viscometer, wherein the compositions do not contain any grease release agents such as choline, chloride or a buffering system which is a nitrogenous buffer which is ammonium or alkaline earth carbonate, amine oxide surfactants, ethylene 15 diamine tetraacetic acids or any salt thereof, guanidine derivates, alkoxylalkyl amines and alkyleneamines C3-C7 which do not contain a hydroxy group, boric acid, phosphoric acid, amino alkylene phosphonic acid and alkyl polyglucoside surfactants and the compositions are pourable and are not a gel. The anionic sulfonate surfactants which may be used in the compositions of this 00 invention are selected from the consisting of water soluble and include the sodium, potassium, ammonium, magnesium and ethanolammonium salts of linear C8-C16 alkyl benzene sulfonates and C10-C20 paraffin sulfonates. 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 25 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 IPONZ 2 7 SEP 2007 WO 03/083024 PCT/US03/09038 6 C14-17 range will be minor and will be minimized, as will be any contents of di- or poly-sulfonates. Examples of suitable other sulfonated anionic detergents are the well known higher alkyl mononuclear aromatic sulfonates, such as the higher alkylbenzene 5 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 3-phenyl (or higher) isomers and a correspondingly lower content (well below 50%) of 2-phenyl (or lower) isomers, such as those sulfonates wherein the benzene ring is 10 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 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 15 - + R-(0CHCH2)n0S03M wherein n is about 1 to about 22 more preferably 1 to 3 and R is an alkyl group having about 8 to about 18 carbon atoms, more preferably 12 to 15 and natural cuts, for example, C12-14 or C12-I6 and M is an ammonium cation or a metal cation, most 20 preferably sodium. The ethoxylated alkyl ether sulfate is present in the composition at a concentration of about 2 to about 15 wt. %, more preferably about 3 to 12 wt. %. The ethoxylated alkyl ether sulfate may be made by sulfating the condensation product of ethylene oxide and Cs-10 alkanol, and neutralizing the resultant product. The ethoxylated alkyl ether sulfates differ from one another in the number of carbon 25 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. 30 These detergents can be prepared by reacting an alkyl phenol with 1 to 6 moles of WO 03/083024 PCT/US03/09038 7 ethylene oxide and sulfating and neutralizing the resultant ethoxylated alkylphenol. The concentration of the ethoxylated alkyl ether sulfate surfactant is about 2 to about 15 wt. %. The water soluble nonionic surfactants utilized in this invention are commercially 5 well known and include the primary aliphatic alcohol ethoxylates, secondary aliphatic alcohol ethoxylates, alkylphenol ethoxylates and ethylene-oxide-propylene oxide condensates on primary alkanols, such a Plurafacs (BASF) and condensates of ethylene oxide with sorbitan fatty acid esters such as the Tweens (ICI). The nonionic synthetic organic detergents generally are the condensation products of an organic 10 aliphatic or alkyl aromatic hydrophobic compound and hydrophilic ethylene oxide groups. Practically any hydrophobic compound having a carboxy, hydroxy, amido, or amino group with a free hydrogen attached to the nitrogen or the oxygen can be condensed with ethylene oxide or with the polyhydration product thereof, polyethylene glycol, to form a water-soluble nonionic detergent. Further, the length of the 15 polyethenoxy chain can be adjusted to achieve the desired balance between the hydrophobic and hydrophilic elements. The nonionic detergent class includes the condensation products of a higher alcohol (e.g., an alkanol containing 8 to 18 carbon atoms in a straight or branched chain configuration) condensed with 5 to 30 moles of ethylene oxide, for example, 20 lauryl or myristyl alcohol condensed with 16 moles of ethylene oxide (EO), tridecanol condensed with 6 to moles of EO, myristyl alcohol condensed with about 10 moles of EO per mole of myristyl alcohol, the condensation product of EO with a cut of coconut fatty alcohol containing a mixture of fatty alcohols with alkyl chains varying from 10 to 14 carbon atoms in length and wherein the condensate contains either 6 moles of EO 25 per mole of total alcohol or 9 moles of EO per mole of alcohol and tallow alcohol ethoxylates containing 6 EO to 11 EO per mole of alcohol. A preferred group of the foregoing nonionic surfactants are the Neodol ethoxylates (Shell Co.), which are higher aliphatic, primary alcohols containing about 9- 15 carbon atoms, such as Cg-C^ 1 alkanol condensed with 8 moles of ethylene oxide WO 03/083024 PCT/US03/09038 8 (Neodol 91-8), C-12-13 alkanol condensed with 6.5 moles ethylene oxide (Neodol 23-6.5), C-J2-15 alkanol condensed with 12 moles ethylene oxide (Neodol 25-12), C-j4_-)5 alkanol condensed with 13 moles ethylene oxide (Neodol 45-13), and the like. Such ethoxamers have an HLB (hydrophobic lipophilic balance) value of 8-15 and give good i emulsification, whereas ethoxamers with HLB values below 8 contain less than 5 ethyleneoxy groups and tend to be poor emulsifiers and poor detergents. Additional satisfactory water soluble alcohol ethylene oxide condensates are the condensation products of a secondary aliphatic alcohol containing 8 to 18 carbon atoms in a straight or branched chain configuration condensed with 5 to 30 moles of 10 ethylene oxide. Examples of commercially available nonionic detergents of the foregoing type are 1-C15 secondary alkanol condensed with either 9 EO (Tergitol 15-S-9) or 12 EO (Tergitol 15-S-12) marketed by Union Carbide. Other suitable nonionic surfactants include the polyethylene oxide condensates of one mole of alkyl phenol containing from 8 to 18 carbon atoms in a straight- or 15 branched chain alkyl group with 5 to 30 moles of ethylene oxide. Specific examples of alkyl phenol ethoxylates include nonyl condensed with 9.5 moles of EO per mole of nonyl phenol, dinonyl phenol condensed with 12 moles of EO per mole of phenol, dinonyl phenol condensed with 15 moles of EO per mole of phenol and di-isoctylphenol condensed with 15 moles of EO per mole of phenol. Commercially available nonionic 20 surfactants of this type include Igepal C0-630 (nonyl phenol ethoxylate) marketed by GAF Corporation. Also among the satisfactory nonionic surfactants are the water-soluble condensation products of a C8-C20 alkanol with a heteric mixture of ethylene oxide and propylene oxide wherein the weight ratio of ethylene oxide to propylene oxide is from 25 2.5:1 to 4:1, preferably 2.8:1-3.3:1, with the total of the ethylene oxide and propylene oxide (including the terminal ethanol or propanol group) being from 60-85%, preferably 70-80%, by weight. Such detergents are commercially available from BASF-Wyandotte .and a particularly preferred detergent is a C-jo-C-|6 alkanol condensate with ethylene WO 03/083024 PCT/US03/09038 9 oxide and propylene oxide, the weight ratio of ethylene oxide to propylene oxide being 3:1 and the total alkoxy content being 75% by weight. Other suitable water-soluble nonionic surfactants which are less preferred are marketed under the trade name "Pluronics". The compounds are formed by 5 condensing ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol. The molecular weight of the hydrophobic portion of the molecule is of the order of 950 to 4000 and preferably 200 to 2,500. The addition of polyoxyethylene radicals to the hydrophobic portion tends to increase the solubility of the molecule as a whole so as to make the surfactant water-soluble. The 10 molecular weight of the block polymers varies from 1,000 to 15,000 and the polyethylene oxide content may comprise 20% to 80% by weight. Preferably, these surfactants will be in liquid form and satisfactory surfactants are available as grades L62 and L64. The magnesium inorganic compound is a magnesium oxide, sulfate or chloride. 15 The magnesium salt or oxide provides several benefits including improved cleaning performance in dilute usage, particularly in soft water areas. Magnesium sulfate, either anhydrous or hydrated (e.g., heptahydrate), is especially preferred as the magnesium salt. Good results also have been obtained with magnesium oxide, magnesium chloride, magnesium acetate, magnesium propionate and magnesium hydroxide. 20 These magnesium salts can be used with formulations at neutral or acidic pH since magnesium hydroxide will not precipitate at these pH levels. Polyethylene glycol which is used in the instant composition has a molecular weight of 200 to 1,000, wherein the polyethylene glycol has the structure H0(CH2CH20)nH 25 wherein n is 4 to 52. The concentration of the polyethylene glycol in the instant composition is 0 to 5 wt. %, more preferably 0.1 wt. % to 4 wt. %. The preservative system used in the instant compositions is a mixture of a preservative and a preservative potentiator. The preservatives used in the instant composition are preferably selected from the group consisting of: WO 03/083024 PCT/US03/09038 10 (i) 1,3-dimethylol-5,5-dimethylhydantoin having the structure of: HO—CH2 ■ N 10 N-CH2-OH 0=C C-(CH3)2 2-bromo-2-nitropropane-1,3-diol having the structure: 15 r HOCH2—C—CH20H N02 ii) a synergistic mixture of three different isothiazolones having the structure: 20 X-C C-H C=0 25 NR In the relative proportions of 2 to 2.5% for the 5-chloro-2-methyl-4-isothiazolin-3-one (R= CH3, X= CI), 0.7 to 0.8% for the 2-methyl-4-isothiazolin-3-one (R=CH3, X= H) and 0.5 to 0.7% for the 2-n octyl-4-isothiazolin-3-one (R= n-C8H17, X= H). WO 03/083024 PCT/US03/09038 11 The instant light duty liquid compositions can contain about 0 wt. % to about 10 wt. %, more preferably about 1 wt. % to about 8 wt. %, of at least one solubilizing agent selected from the group consisting of a C2-5 mono, dihydroxy or polyhydroxy alkanols such as ethanol, isopropanol, glycerol ethylene glycol, diethylene glycol, propylene 5 glycol, and hexylene glycol and mixtures thereof and alkali metal cumene or xylene sulfonates such as sodium cumene sulfonate and sodium xylene sulfonate. The solubilizing agents are included in order to control low temperature cloud clear properties. The instant formulas explicitly exclude alkali metal silicates and alkali metal 10 builders such as alkali metal polyphosphates, alkali metal carbonates and alkali metal phosphonates because this material, if used in the instant composition, would cause the composition to have a high pH as well as leaving residue on the surface being cleaned. The final essential ingredient in the inventive compositions having improved 15 interfacial tension properties is water. The proportion of water in the compositions generally is in the range of 10% to 95%. The liquid cleaning composition of this invention may, if desired, also contain other components either to provide additional effect or to make the product more attractive to the consumer. The following are mentioned by way of example: Colors or 20 dyes or perfumes in amounts up to 1.0% by weight 2,6-di-tert.butyl-p-cresol, etc., in amounts up to 2% by weight for color improvement under stressed sun conditions and pH adjusting agents, such as citric acid or sodium hydroxide, as needed. Furthermore, if opaque compositions are desired, up to 4% by weight of an opacifier may be added. In final form, the instant compositions exhibit stability at reduced and increased 25 temperatures. More specifically, such compositions remain clear and stable in the range of 0°C to 50°C, especially 5°C to 43°C. Such compositions exhibit a pH of 4 to 8. The liquid compositions are readily pourable and exhibit a viscosity in the range of 100 to 1000 milliPascal. second (mPas.) as measured at 25°C. with a Brookfield </div>

Claims

<div class="application article clearfix printTableText" id="claims"> WO 03/083024 PCT/US03/09038 12 RVTDV-II Viscometer. Preferably, the viscosity is maintained in the range of 200 to 600 mPas. The following examples illustrate the liquid body cleaning compositions of the described invention. Unless otherwise specified, all percentages are by weight. The 5 exemplified compositions are illustrative only and do not limit the scope of the invention. Unless otherwise specified, the proportions in the examples and elsewhere in the specification are by weight. Example 1 The following compositions in wt. % were prepared by simple mixing procedure: 10 A B C D C14-17 Paraffin sulfonate 9.1 9.1 9.1 9.1 MflS04.7H20 1.0 1.0 3.0 3.0 Perfume 0.13 0.13 0.13 0.13 C12-13 alcohol ethoxysulfate E02:1 7.5 7.5 7.5 7.5 Polyethylene glycol 300 0.6 0.6 0.6 0.6 Tetra sodium imino disuccinate - 0.149 - 0.149 Optically pure isomer of trisodium S,S ethylenediamine -N,N' disuccinate 0.086 - 0.086 - 2-bromo-2-nitropropane-1,3-diol 0.025 0.025 0.025 0.025 Sodium chloride 2.5 2.5 1.7 1.7 Water Balance Balance Balance Balance pH 6.0 6.0 6.0 6.0 Example 2 The following compositions in wt. % were prepared by simple mixing procedure: A B C D C14-17 Paraffin sulfonate 23.4 23.4 23.4 23.4 Nonionic C9-11.7.5-8 EO 2 2 2 2 MgS04.7H20 1 1 1 1 Perfume 0.21 0.21 0.21 0.21 C12-13 alcohol ethoxysulfate E02:1 5.9 5.9 5.9 5.9' Polyethylene glycol 300 1 1 1 1 Tetra sodium imino disuccinate 0.081 0.081 - - Optically pure isomer of trisodium S,S ethylenediamine -N,N' disuccinate - - 0.086 0.086 1,3-Dimethvlol-5,5-dimethvlhvdantoin 0.14 - 0.14 - Isothiazolone mixture - . 0.0014 0.0014 2-bromo-2-nitropropane-1,3-diol 0.015 0.025 0.015 0.025 Water Balance Balance Balance Balance PH 6.0 6.0 6.0 6.0 15 13 What Is Claimed:

1. A liquid dish cleaning composition which comprises approximately by weight: (a) 5% to 15% of at least one anionic surfactant selected from the group consisting of linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1 % to 4% of a polyethylene glycol; (d) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantoin, an isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (e) 0.01 % to 1.5% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S,S ethylene diamine-N,N'- dissuccinate, and tetra sodium imino dissucinate; and (f) the balance being water.

2. The composition of Claim 1, wherein said at least one anionic surfactant is a paraffin sulfonate.

3. The composition of Claim 2, wherein said preservative is 2-bromo-2-nitropropane-1,3-diol.

4 The composition of Claim 1, wherein said preservative potentiator is trisodium S,S ethylene diamine-N,N-disuccinate.

5. The composition of Claim 1 further including a sodium salt of an ethoxylated alkyl ether sulfate surfactant.

6. A liquid dish cleaning composition which comprises approximately by weight: (a) 15% to 35% of at least one anionic sulfonated surfactant selected from the group consisting of a linear alkyl benzene sulfonates and paraffin sulfonates and mixtures thereof; IPONZ 2 7 S:P 2037 14 (b) 0.5% to 4% of a magnesium containing inorganic compound; (c) 0.1 % to 10% of at least one ethoxylated nonionic surfactant; (d) 0.1 % to 4% of a polyethylene glycol; (e) 0.0005% to 0.3% of a preservative selected from dimethylol dimethyl hydantoin, isothiazolone mixture, 2-bromo-2-nitropropane-1,3-diol and mixtures thereof; (f) 0.01 % to 1.5% of a preservative potentiator which is selected from the group consisting of an optically pure isomer of trisodium S,S ethylene diamine-N,N'-disuccinate and tetra sodium iminodisuccinate; and (g) the balance being water.

7. The composition of Claim 6 which comprises by weight 0.05% to 1.0% of the preservative potentiator.

8. The composition of Claim 6 or Claim 7, wherein said at least one anionic sulfonated surfactant is a paraffin sulfonate.

9. The composition of Claim 8, wherein said preservative is a dimethylol dimethyl hydantoin.

10. The composition of Claim 6 or Claim 7 further including a sodium salt of an ethoxylated alkyl ether sulfate surfactant.

11. The composition of claim 6 or Claim 7, wherein said preservative potentiator is trisodium S,S ethylenediamine-N,N'-disuccinate.

12. A liquid dish cleaning composition as claimed in claim 1 or 6 substantially as herein described with reference to any example thereof. INTELLECTUAL PROPERTY OFFICE OF N.Z. 11 OCT 2007 RECEIVED </div>