Liquid detergent composition for improved greasy soil removal

Abstract

 Liquid detergent compositions containing specific mixtures of selected anionic, nonionic and water-soluble cationic surfactants. The compositions are especially effective in removing greasy soil from fabrics.

Description

[0001] 

compositions for the purpose of yielding a germicidal or sanitization benefit to washed surfaces, as is disclosed in U.S. Patent 2,742,434, Kopp, issued April 17, 1956; U.S. Patent 3,539,520, Cantor et al, issued November 10, 1970; and U.S. Patent 3₁965,026, Lancz, issued June 22, 1976. Other cationic surfactants, such as ditallowdimethylammonium chloride, have been included in detergent compositions for the purpose of yielding a fabric-softening benefit, as disclosed in U.S. Patent 3,607,763, Salmon et al, issued September 21, 1971; and U.S. Patent 3,644,203, Lamberti et al, issued February 22, 1972. Such components are also disclosed as being included in detergent compositions for the purpose of controlling static, as well as softening laundered fabrics, in U.S. Patent 3,951,879, Wixon, issued April 20, 1976; and U.S. Patent 3,959,157, Inamorato, issued May 25, 1976.

[0002] Compositions comprising mixtures of anionic, cationic and nonionic surfactants are also known in the art. Thus, compositions conferring enhanced antistatic character to textiles washed therewith are described in B.P. 873,214 while compositions having enhanced germidical and detergency performance are disclosed in B.P. 641,297.

[0003] Surprisingly, it has now been found, however, that liquid detergent compositions comprising water-soluble or dispersible mixtures of specific anionic, cationic and nonionic surfactants in critical relative amounts provide unexpectedly improved cleaning performance on greasy and oily soils, even where these have a high content of particulate matter. Moreover, this excellent performance is observed at both high and low wash temperatures and over a range of realistic soil types and wash conditions. Furthermore, the enhanced greasy stain removal performance is achieved without detriment to detergency performance on conventional soil and stain types and most surprisingly, without detriment to the soil suspending or fabric whitening characteristics of the compositions.

Summary of the Invention

[0004] A liquid detergent composition comprising from 2-100% of a surfactant system consisting essentially of a water-soluble or water-dispersible combination of

(a) from 15 to 45% of an anionic surfactant

(b) a water-soluble quaternary ammonium cationic surfactant in a ratio of anionic:cationic surfactant of less than 5:1

(c) a nonionic surfactant having the formula RO(C₂H₄O)_nH wherein R is primary or secondary, branched or unbranched C_8-24 alkyl or alkenyl or C_6-12 alkyl phenyl, and n, the average degree of ethoxylation is from 2 to 9, and wherein the ratio of nonionic:cationic surfactant is from 5:1 to 2:3.

[0005] Detergent compositions of the present invention contain as an essential ingredient a three-component active system comprising anionic, alkoxylated nonionic and water-soluble cationic surfactants. This active system comprises from about 2% to 100% by weight of the compositions. In_' liquid laundry detergent applications, the active system is generally in the range from about 20% to about 70%, more preferably from about 25% to about 60% by weight of the compositions.

[0006] The compositions of the present invention are pref- ably formulated to have a pH of at least about 6 in the laundry solution at conventional usage concentrations (about 1% by weight) in order to optimize cleaning performance. More preferably, they are alkaline in nature when placed in the laundry solution and have a pH greater than about 7, especially greater than about 8. At the higher pH values, the surface activity of the compositions of the invention is enhanced and, in certain instances, is quite markedly enhanced.

[0007] In preferred systems, the anionic and cationic surfactants have a combined total of no more than 34 carbon atoms counted in hydrophobic groups having at least .4 consecutive carbon atoms (eg. alkyl, alkaryl, aryl, alkaryl, aralkyl groups etc.). In more preferred systems the number of such hydrophobic group carbon atoms totals from about 18 to 33, especially from about 26 to 32, with the anionic surfactant providing at least 12 of the carbon atoms. These hydrophobicity limitations have been found to optimize the interaction of the ternary active system with greasy and oily stains on fabrics and to correspond to compositions of maximum grease detergency effectiveness.

[0008] .A preferred feature of the present compositions is that the surfactant system is substantially neutral in surfactant anions and cations or else has an ionic excess of surfactant anions over surfactant cations. This is important not only with regard to optimizing grease removal, but also for ensuring good suspension of soil in the detergent wash liquor (ie. for preventing soil redeposition) and also for ensuring that water-insoluble anionic effect agents such as anionic fluorescers retain their effectiveness in composition. It is, of course, well known, that anionic fluorescers are quenched or inhibited in effectiveness in the presence of cationic surfactants. Surprisingly, the grease and oil detergency benefits of the present invention can be secured without suppression of fluorescer activity. It is accordingly highly preferred that the overall anionic:cationic surfactant equivalent ratio in the present compositions is, within manufacturing error, at least 1:1.

[0009] At typical composition levels, the manufacturing error in the anionic and cationic surfactant components is up to about 5% by weight for each component.

[0010] With regard to surfactant ratios, the weight ratio of anionic:cationic surfactant can vary in the range from about 5:1 to 1:3, especially from about 2:1 to about 1:2, the weight ratio of nonionic:cationic from about 5:1 to about 2:3, especially from about 5:1 to 5:3 and the weight ratio of anionic:nonionic from about 2:1 to about 1:4.5, especially from about 1:1 to about 1:4. In terms of surfactant levels, the surfactant system preferably comprises at least about 10% by weight of the water-soluble cationic surfactant and at least about 60% by weight in total of the anionic and nonionic surfactants. In a preferred embodiment, the surfactant system comprises from 15% to 45% by weight of the anionic surfactant, at least 15% by weight of the cationic surfactant and from 15% to 60% by weight of the nonionic surfactant.

[0011] As mentioned above, the cationic surfactant component of the composition of the invention is characterised as being water-soluble. By water solubility, we refer in this context to the solubility of cationic surfactant in monomeric form, the limit of solubility being determined by the onset of micellisation and measured in terms of critical micelle concentration (C.M.C.). The cationic surfactant should thus have a C.M.C. for the pure material greater than about 200 ^p.p.m. and preferably greater than about 500 p.p.m., specified at 30°C in distilled water. Literature values are taken where possible, especially surface tension or conductimetric values - see Critical Micelle Concentration- of Aqueous Surfactant Systems, P. Mukerjee and K.J. Mysels, NSRDS-NBS 36, (1971).

[0012] Another important feature is that the ternary active system itself must be water-dispersible or water-soluble in combination with the remainder of the detergent composition. This implies that, in an equilibrium aqueous mixture of the detergent composition (containing about 1000 p.p.m. of surfactant) the ternary active system exists in one or more liquid (as opposed to solid) surfactant/water phases. Expressed in another way, the surfactant .

[0013] system should have a Krafft point of no higher than about 25°C.

[0014] A further preferred component of the present compositions is from 1% to 70% by weight of a detergency builder, for example, a water-soluble inorganic or organic .electrolyte. Suitable electrolytes have an equivalent weight of less than 210, especially less than 100 and include the common alkaline polyvalent calcium ion sequestering agents. Water-insoluble calcium ion exchange materials can also be used with advantage, however. Surprisingly, it is found that the-grease removal permance of certain of the present compositions depends sensitively on the ionic strength and the level of free hardness ions in the detergent liquor and these parameters must be closely controlled for optimum performance. Thus, when the compositions are used in about 1% solution, the builder: surfactant weight ratio is preferably greater than about 1:4, the calcium ion sequestering or exchange agent: surfactant weight ratio is preferably greater than about 1:3, and the electrolyte:surfactant weight ratio is also preferably greater than about 1:3.

[0015] Optimum grease and particulate detergency also depends sensitively on the choice of nonionic surfactant and especially desirable from the viewpoint of grease detergency are biodegradable nonionic surfactants having a lower consolute temperature in the range from about 25 C to about 65°_C, more preferably from about 30°C to about 50°C. Highly suitable nonionic surfactants of this type have the general formula RO(CH₂CH₂O)_nH wherein R is primary or secondary branched or unbranched C_9-15 alkyl or alkenyl and n (thc average degree of ethoxylation) is from 2 to 9, especially from 3 to 8. More hydrophilic nonionic detergents can be employed for providing particulate detergency and anti-redeposition, however, for instance, nonionic detergents of the general formula given above wherein R is primary or secondary, branched or unbranced C_8-24 alkyl or alkenyl and n is from 10 to 40. Combinations of the two classes of nonionic surfactants can thus be used with advantage.. invention will now be described in detail. The Cationic Surfactant

[0016] The cationic surfactant is a water-soluble quaternary ammonium compound having a critical micelle concentration of at least 200 p.p.m. at 30 °C. In structural terms, the preferred cationic surfactant comprises from 1 to about 4 quaternary ammonium groups of which only one has the general formula:-

wherein each R¹ is a hydrophobic alkyl or alkenyl group optionally substituted or interrupted by phenyl, ether, ester or amide groups totalling from 8 to 20 carbon atoms and which may additionally contain up to 20 ethoxy groups, m is a number from 1 to 3 and no more than one R can have more than 16 carbon atoms when m is 2 and no more than 12 carbon atoms when m is 3, each R² is an alkyl or hydroxyalkyl group containing from one to four carbon atom or a benzyl group with no more than one R² in a molecule being benzyl, and x is from O to 3.

[0017] A highly preferred group of cationic surfactants of this type have the general formula:

wherein R¹ is selected from C₈-C₂₀ alkyl, alkenyl and alkaryl groups; R² is selected from C_1-4 alkyl, hydroxyalkyl a benzyl groups; Z is an anion in number to give electrical neutrality; and m is 1., 2 or 3; provided that when m is 2, R¹ has less than 15 carbon atoms and when in is 3, R¹ has less than 9 carbon atoms.

[0018] where m is equal to 1, it is preferred that R² is a methyl or hydroxyethyl group. Preferred compositions of the long chain type include those in which R¹ is a C₁₀ to C₁₆ alkyl group. Particularly preferred compositions of this class include C₁₂ alkyl trimethylammonium halide

[0019] C₁₄ alkyl trimethylammonium halide, coconutalkyl dimethylhydroxyethyl ammonium halide and coconutalkyl dihydroxye methyl ammonium halide.

[0020] Where m is equal to 2, the R¹ chains should have less than 14 carbon atoms. Thus, ditallowdimethylammonium chloride and distearyldimethylammonium chloride, which are used conventionally as fabric softeners and static control agents in detergent compositions, may not be used as the cationic component in the surfactant mixtures of the present invention. Particularly preferred cationic materials of this class include di-C₈ alkyldimethylammonium halide and di-C₁₀ alkyldimethylammonium halide materials.

[0021] Where m is equal to 3, the R¹ chains should be less than 9 carbon atoms in length. An example is trioctyl- methyl ammonium chloride. The reason for this chain length restriction, as is also the case with the di-long chain cationics described above, is the relative insolubility of these tri - and di-long chain materials.

[0022] Another group of useful cationic compounds are the polyammonium salts of the general formula:

wherein R₃ is selected from C₈ to C₂₀ alkyl, alkenyl and alkaryl groups; each R₄ is C₁-C₄ alkyl or hydroxyalkyl; n is from 1 to 6; and in is from 1 to 3.

[0023] A specific example of a material in this group is:

[0024] A further preferred type of cationic component, has the formula:

wherein R¹ is C₁ to C₄ alkyl or hydroxyalkyl, R² is C₅ to C₃₀ straight or branched chain alkyl or alkenyl, alkyl benzene, or

; wherein s is from O to 5, R³ is C₁ to C₂₀ alkyl or alkenyl; a is O or 1; n is O or 1; m is from 1 to 5; Z¹ and Z² are each selected from the group consisting of:

and wherein at least one of said groups is selected from the group consisting of ester, reverse ester, amide and reverse.amide; and X is an anion which makes the compound water-soluble, preferably selected from the group consisting of halide, methyl sulfate, hydroxide, and nitrate preferably chloride, bromide or iodine.

[0025] In addition to the advantages of the other cationic surfactants disclosed herein, this particular cationic component is enviromentally desirable, since it is biode-, gradable, both in terms of its long alkyl chain and its nitrogen-containing segment.

[0026] Particularly preferred cationic, surfactants of this type are the choline ester derivatives having the following formula:

as well as those wherein the ester linkage in the above formula is replaced with a reverse ester, amide or reverse amide linkage.

[0027] Particularly preferred examples of this type of cationic surfactant include caproyl choline ester quat- ernary ammonium halides (R² = C₉ alkyl), palmitoyl choline ester quaternary ammonium halides (R² = C₁₅ alkyl), myristoyl choline ester quaternary ammonium halides (R² = C₁₃ alkyl), lauroyl chloine ester ammonium halides (R² = C₁₁ alkyl), and capryloyl choline ester quaternary ammonium halides (R² = C₁₇ alkyl).

[0028] Additional preferred cationic components of the choline ester variety are given by the structural formulas below, wherein p may be from 0 to 20.

[0029] The preferred choline-derivative cationic substances, discussed above, may be prepared by the direct esterification of a fatty acid of the desired chain length with dimethylaminoethanol, in the presence of an acid catalyst. The reaction product is then quaternized with a methyl halide, forming the desired cationic material. The choline-derived cationic materials may also be prepared by the direct esterification of a long chain fatty acid of the desired chain length together with 2-halocthanol, in the presence of an acid catalyst material. The reaction product is then used to quaternize triethanolamine, forming the desired cationic component.

[0030] Another type of novel particularly preferred cationic material, has the formula:

[0031] In the above formula, each R¹ is a C₁ to C₄ alkyl or hydroxy alkyl group, preferably a methyl group. Each R² is either hydrogen or C₁ to C₃ alkyl., preferably hydrogen. R³ is a C₄ to C₃₀ straight of branched chain alkyl, alkenyl, or alkyl benzyl group, preferably a C₈ to C₁₈ alkyl group, most preferably a C₁₂ alkyl group. R⁴ is a C₁ to C₁₀ alkylene or alkenylene group. n is from 2 to 4, preferably 2; y is from 1 to 20, preferably from about 1 to 10, most preferably about 7; a may be 0 or 1; t may be O or 1; and m is from 1 to 5, preferably 2. Z¹ and Z² are each selected from the group consisting of

and wherein at least one of said groups is selected from the group consisting of ester, reverse ester, amide and reverse amide. X is an anion which will make the compound water-soluble and is selected from the group consisting of halides, methylsulfate, hydroxide and nitrate, particularly chloride, bromide and iodide.

[0032] These surfactants, when used in the compositions of the present invention, yield excellent particulate soil, body soil, and grease and oil soil removal. In addition, the detergent compositions control static and soften the fabrics laundered therewith, and inhibit the transfer of dyes in the washing solution. Further, these novel cationic surfactants are environmentally desirable, since both their long chain alkyl segments and their nitrogen segments are biodegradable.

[0033] Preferred embodiments of this type of cationic component arc the choline esters (R¹ is a methyl group and Z² is an ester or reverse ester group), particular formulas of which are given below by which t is O or 1 and y is from 1 to 20.

[0034] The preferred choline derivatives, described above, may be prepared by the reaction of a long chain alkyl polyalkoxy (preferably polyethoxy) carboxylate, having an alkyl chain of desired length, with oxalyl chloride, to form the corresponding acid chloride. The acid chloride is then reacted with dimethylaminocthanol to form the appropriate amine ester, which is then quatcrnixed with a methyl halide to form the desired choline ester compound. Another way of preparing these compounds is by the direct esterification of the appropriate long chain cthoxylated carboxylic acid together with 2-halocthanol or dimethyl aminoethanol, in the presence of heat and an acid catalyst. The reaction product formed is then quaternized with methylhalide or used to quaternize The Anioni c and Nonionic Surfactant

[0035] A typical listing of anionic and nonionic surfactants useful herein appears in U.S.P. 3,925,678 incorporated herein by reference.

[0036] The following list of detergent compounds which can be used in the instant compositions is representative of such materials.

[0037] Water-soluble salts of the higher fatty acids, ie. "soaps", are useful as the anionic detergent component of the compositions herein. This class of detergents includes ordinary alkali metal soaps such as the sodium, potassium, ammonium and alkylolammonium salts of higher fatty acids containing from about 8 to about 24 carbon atoms and preferably from about 10 to about 20 carbon atoms. Soaps can be made by direct saponification of fats and soils or by the neutralization of free fatty acids. Particularly useful are the sodium and potassium salts of the mixtures of fatty acids-derived from coconut oil and tallow, i.e. sodium or potassium tallow and coconut soap.

[0038] A highly preferred class of anionic detergents includes water-soluble salts, particularly the alkali metal, ammonium and alkylolammonium salts, of organic sulfuric reaction products having in their molecular structure'an alkyl group containing from about 8 to about 22, especially from about 10 to about 20 carbon atoms and a sulfonic acid or sulfuric acid ester group. (Included in the term "alkyl" is the alkyl portion of acyl groups). Examples of the detergent compositions of the present invention are the sodium and potassium alkyl sulfates, especially those obtained by sulfating the higher alcohols C₈-C₁₈ carbon atoms) produced by reducing the glycerides of tallow or coconut oil; and sodium and potassium alkyl benzene sulfonates, in which the alkyl group contains from about 9 to about 15 carbon atoms, in straight chain or branched chain configuration, e.g. those of the type deseribed in U.S.P. 2,220,099 and 2,477,383. Espocially valuable are linear straight chain alkyl benzene sulfonates in which the average of the alkyl group is about 11.8 carbon atoms, abbreviated as C_11.8 LAS.

[0039] A preferred alkyl ether sulfate surfactant component of the present invention is a mixture of alkyl ether sulfates, said mixture having an average (arithmetic mean) carbon chain length within the range of about 12 to 16 carbon atoms, preferably from about 14 to 15 carbon atoms, and an average (arithmetic mean) degree of ethoxylation of from about 1 to 4 mols of ethylene oxide.

[0040] Other anionic detergent compounds herein include the sodium alkyl glyceryl ether sulfonates, especially those ethers of higher alcohols derived from tallow and coconut oil; sodium coconut oil fatty acid monoglyceride sulfonates and sulfates; and sodium or potassium salts of alkyl phenol ethylene oxide ether sulfate containing about 1 to about 10 units of ethylene oxide per molecule and wherein the alkyl groups contain about 8 to about 12 carbon atoms.

[0041] Other useful anionic detergent compounds.herein include the water-soluble salts of esters of a-sulfonated fatty acids containing from about 6 to 20 carbon atoms in the fatty acid group and from about 1 to 10 carbon atoms in the ester group; water-soluble salts of 2-acyloxy-alkane-l-sulfonic acids containing from about 2 to 9 carbon atoms in the acyl group and from about 9 to about 23 carbon atoms in the alkane moiety; alkyl ether sulfates containing from about 10 to 20 carbon atoms in the alkyl group and from about 1 to 30 moles of ethylene oxide; water-soluble salts of olefin sulfonates containing from about 12 to 24 carbon atoms; water-soluble salts of paraffin sulfonates containing from about 8 to 24, especially 14 to 18 carbon atoms, and β-alkyloxy alkane sulfonates containing from about 1 to 3 carbon atoms in the alkyl group and from about 8 to 20 carbon atoms in the alkane moiety.

[0042] Anionic surfactant mixtures can also be employed, for example 5:1 to 1:5 mixtures of an alkyl benzene sulfonate having from 9 to 15 carbon atoms in the alkyl radical and mixtures thereof, the cation being an alkali metal preferably sodium; and from about 2% to about 15% by weight of an alkyl ethoxy sulfate having from 10 to 20 carbon atoms in the alkvl radical and from 1 to 30 ethoxy groups and mixtures thereof, having an alkali metal cation, preferably sodium. The nonionic detergent materials can be broadly defined as compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an'organic hydrophobic compound, which may be aliphatic or alkyl aromatic in nature. The length of the polyoxyalkylene group which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.

[0043] Examples of suitable nonionic detergents include:

1. The polyethylene oxide condensates of alkyl phenol, eg. the condensation products of alkyl phenols having an alkyl group containing from 6 to 12 carbon atoms in either a straight chain or branched chain configuration, with ethylene oxide, the said ethylene oxide being present in amounts equal to 2 to 9 moles, preferably from ₃ to 8 moles of ethylene oxide per mole of alkyl phenol. The alkyl substitutent in such compounds may be derived, for example, from polymerised propylene di-iscbutylene, octene or nonene. Other examples include dodecyl phenol condensed with 2 moles of ethylene oxide per mole of phen dinonylphenol condensed with 5 moles of ethylene oxide per mole of phenol; nonylphenol condensed with 9 moles of ethylene oxide per mole of nonylphenol and di-iso-octylphenol condensed with 5 moles of ethylene oxide.

2. The condensation product of primary or secondary aliphatic alcohols having from 8 to 24 carbon atoms, in either straight chain or branched chain configuration, with from 2 to about 9 moles of alkylene oxide per mole of alcohol. Preferably, the aliphatic alcohol comprises between 9 and 15 carbon atoms and is ethoxylated with between

3 and 8 moles of ethylene oxide per mole of aliphatic alcohol. Such nonionic surfactants arc preferred from the point of view of providing good to excellent detergency performance on fatty and greasy soils, and in the presence of hardness sensitive anionie surfactants such as alkyl benzene sulphonatos. The preferred surfactants are prepared from primary alcohols which are either linear (such as those derived) from natural fats of prepared by the Ziegler process from ethylene, eg. myristyl, cetyl, stearyl alcohols), or partly branched such as the Dobanols and Neodols which have about 25% 2-methyl branching (Dobanol and Ncodol being Trade Names of Shell) . or Synperonics, which are understood to have about 50% 2-methyl branching (Synperionic is a trade name of I.C.I.) or the primary alcohols having more than 50% branched chain structure sold under the Trade Name Lial by Liquichimica.

[0044] Specific examples of nonionic surfactants falling within the scope of the invention include Dobanol 45-4, Dobanol 45-7, Dobanol 45- 9., Dobanol 91-3, Dobanol 91-6, Dobanol 91-8, Synperonic 6, Synperonic 14, the condensation products of coconut alcohol with an average of between 5 and 9 moles of ethylene oxide per mole of alcohol, the coconut alkyl portion having from 10 to 14 carbon atoms, and the condensation products of tallow alcohol with an average of between 7 and 9_' moles of ethylene oxide per mole of alcohol, the tallow portion comprising essentially between 16 and 22 carbon atoms. Secondary linear alkyl ethoxylates are also suitable in the present compositions, especially those ethoxylates of the Tergitol series having from about 9 to 16 carbon atoms in the alkyl group and up to about 9, especially from about 3 to 8, ethoxy residues per molecule.

[0045] A highly preferred mixture of surfactants is a mixture of a C₈-C₂₂ alkyl benzene sulfonate and a C₉-C₁₅ alkanol ethoxylated with from 3 to 8 moles of ethylene oxide per mole of alkanol. Highly preferred mixtures include C₁₂ alkyl benzene sulfonate and C₁₄-C₁₅ alcohol-(7)-ethoxylate, in ratios of from 2:1 to 1:4.5, preferably 1:1 to 1:8. In still more preferred compositions, C₈-C₂₄ alkanol ethoxylate with from 10 to 40 moles of ethylcne oxide per mole of alkanol is added to the above-described mixture, preferably at a level of from 1% to 5%.

Additional Tngredient

[0046] The detergent composition of the invention can also contain about 1% to a bout 70% of a detergency builder, especially a water-soluble inorganic or organic electrolyte. Suitable electrolytes have an equivalent weight of less than 210, especially less than 100 and include the common alkaline polyvalent calcium ion sequestering agents. The builder can also include water-insoluble calcium ion exchange materials, however, Non-limiting examples of suitable water-soluble, inorganic detergent builders include: alkali metal carbonates, borates, phosphates, polyphosphates, bicarbonates, silicates, sulfates and chlorides. Specific examples of such salts include sodium and potassium tetraborates, perborates, bicarbonates, carbonates, tripolyphosphates, orthophosphates, pyrophosphates, hexametaphosphates and sulfates.

[0047] Examples of suitable organic alkaline detergency builders include: (1) water-soluble amino carboxylates and amino- polyacetates, for example, sodium and potassium glycinates, ethylenediamine tetraacetates, nitrilotriacetates, and N-(2-hydroxyethyl)nitrilo diacetates and diethylenetriamine pentaacetates; (2) water-soluble salts of phytic acid, for example, sodium and potassium phytates; (3) water-soluble polyphosponates, including sodium, potassium, and lithium salts of ethane-1-hydroxy-1,1-diphosphonic acid; sodium, potassium, and lithium salts of ethylene diphosphonic acid; and the like.

[0048] (4) water-soluble polycarboxylates such as the salts of lactic acid, succinic acid, malonic acid, maleic acid, citric acid, carboxymethyloxysuccinic acid, 2-oxa-1,1,3-pxopane tricarboxylic acid, 1,1,2,2-ethane tetracarboxylic acid, cyclopentane-cis, cis, cis - tetracarboxylic acid, mellitic acid and pyromellitic acid; (5) water-soluble organic amines and amine salts such as monoethanolamine, diethanolamine and triethanolamine and salts thereof.

[0049] Mixtures of organic and/or inorganic builders can be used herein. One such mixture of builders is disclosed in Canadian Patent No. 755.038, e.g. a ternary mixture of sodium tripolyphosphate, trisodium nitrilotriacetate, and trisodium ethanc-1-hydroxy-1,1-diphosphonate.

[0050] Another type of detergency builder material useful in the present compositions and processes comprises a water-soluble material capable of forming a water-insoluble reaction product with water hardness cations preferably in combination with a crystallization seed which is capable of providing growth sites for said reaction product. Such "seeded builder" compositions are fully disclosed in British Patent Specification No. 1,424,406.

[0051] A further class of detergency builder materials useful in the present invention are insoluble sodium aluminosilicates, particularly those described in Belgium Patent 814,874, issued November 12, 1974, incorporated herein by reference. This patent discloses and claims detergent compositions containing sodium aluminosilicates having the formula

wherein z and y are integers equal to at least 6, the molar ratio of z to y is in the range of from 1.0:1 to about 0.5:1, and X is an integer from about 15 to about 264, said aluminosilicates having a calcium ion exchange capacity of at least 200 milligrams equivalent/gram and a calcium ion exchange rate of at least about 2 grains/gallon/minute/gram.

[0052] A preferred material is

[0053] The compositions of the present invention can be supplemented by all manner of detergent components, either by including such components in the aqueous slurry to be dried or by admixing such components with the compositions of the invention following the drying step. Soil suspending agents at about 0.1% to 10% by weight such as water-soluble salts of carboxymethyl-cellulose, carboxyhydroxymethyl cellulose, and polyethylene glycols having a molecular weight of about 400 to 10,000 are common components of. the present invention. Dyes, pigment optical brighteners, and perfumes can be added .in varying amounts as desired.

[0054] Other materials such as fluorescers, enzymes in minor amounts, anti-caking agents such as sodium sulfosuccinate, and sodium benzoate can also be added. Enzymes suitable for use herein include those discussed in U.S. Patents 3,519,570 and 3,533,139 to McCarty and McCarty et al issued July 7, 1970 and January 5, 1971, respectively.

[0055] Anionic fluorescent brightening agents are well-known materials, examples of which are disodium 4,4'-bis-(2-diethanolamino-4-anilino - s - triazin - 6 - ylamino)stilbene_-2:2 disulphonate, disodium 4,4'-bis-(2-morpholino-4-anilino-s-triazin-6-ylaminostilbene-2:2'-disulphonate, disodium 4,4' -bis-(2,4-dianilino-s-triazin-6-ylarnino)stilbone-2:2'-disulnhonate, disodium 4,4' -bis-(2-anilino-4-(N-methylN-2-hydroxyethylamino)-s-triazin -6-ylamino)stilbene-2,2' -disulphonate, disodium 4,4' -bis-(4-phenyl-2,1,3-triazol-2-yl)-stilbene-2,2'disulphonate, disodium 4,4'bis(2-anilino-4-(1-methyl-2-hydroxycthylamino)-s-triazin-6-ylamino)stilbene-2,2'disulphonate and sodium 2(stilbyl-4'' -(naphtho-1',2':4,5)-1,2,3 - triazole-2''-sulphonate.

[0056] An alkali metal, or alkaline carth metal, silicate can also be present. The alkali metal silicate preferably is used in an amount from 0.5% to 10% preferably from 3% to 8%. Suitable silicate solids have a molar ratio of SiO₂/alkali metal₂O in the range from about 0.5 to about 4.0, but much more preferably from 1.0 to 1.8, especially about 1.6. The alkali metal silicates suitable herein can be commercial preparations of the combination of silicon dioxide and alkali metal oxide, fused together in varying proportions.

[0057] The compositions of this invention can require the presence of a suds regulating or suppressing agent.

[0058] Suds regulating components are normally used in an amount from about 0.001% to about 5%, preferably from about 0.05% to about 3% and especially from about 0.10% to about 1%. The suds suppressing (regulating) agents which are known to be suitable as suds suppressing agents in detergent context can be used in the compositions herein. These include the silicone suds suppressing agents, especially the mixtures of silicones and silica described in U.S. Patent No. 3,933,672, the disclosure of which is incorporated herein by reference. A particularly preferred suds suppressor is the material known as "HYFAC", the sodium salt of a long-chain (C_2o-C₂₄) fatty acid.

[0059] Microcrystalline waxes having a melting point in the range from 35°C-115°C and saponification value of less than 100 represent an additional example of a preferred suds regulating component for use in the subject compositions. The microcrystalline waxes are substantially water-insoluble, but are water-dispersible in the presence of organic surfactants. Preferred microcrystalline waxes having a melting point from about 65°C to 100°C, a molecular.weight in the range from 400-1000; and a penetration value of at least 6, measured at 77°C by ASTM-D1321. Suitable examples of the above waxes include microcrystalline and oxidized microcrystalline petrolatum waxes; Fischer-Tropsch and oxidized Fischer-Tropsch waxes; ozokerite; ceresin; montan wax; beeswax; candelilla; and carnauba wax.

[0060] Other compatible adjunct materials which may be added to the componition of the present invention include zwittcrionic, amphelytic and fatty amide surfactants; buffer materials to control the pH of the composition as described earlier, preferred buffer materials being selected from low molecular weight amino acids, especially glycine, and mono-, di- and tri-ethanolamines, and salts thereof, in levels from 1% to 20%, especially from 3 to 10%; and hydrotropes such as sodium benzoate, or the sodium salts of toluene, xylene or cumene sulphonates, for ensuring phase stability of the liquid compositions.

[0061] A further preferred ingredient of the instant compositions is from about 0.01 to about 4%, especially from about 0.5 to about 2.2% by weight of a polyphosphonic acid or salt thereof which is found to provide blerachable stain detergency benefits.

[0062] Especially preferred polyphosphonates have the formula:

wherein each R is CH₂PO₃H₂ or a water-soluble salt thereof and n is from O to 2. Examples of compounds within this class are aminotri-(methylenephosphonic acid), aminotri-(ethylidenephosphonic acid) , ethylene diamine tetra (methylenephosphonic acid) and diethylene triamine penta (methylene phosphonic acid). Of these, ethylene diamine tetra(methylene phosphonic acid) is particularly preferred.

[0063] A further optional, though preferred component is from about 0.1% to about 3%, especially from about 0.25% to about 1.5% of a polymeric material having a molecular weight of from 2000 to 2,000,000 and which is a copolymer of maleic acid or anhydride and a polymerisable monomer selected from compounds of formula:

wherein R₁ is CH₃ or a C₂ to C₁₂ alkyl group;

wherein R₂ is H or CH₃ and R₃ is H, or a C₁ to C₁₀ alkyl group;

wherein each of R₄ and R₅ is H or an alkyl group such that R₄ and R₅ together have O to 10 carbon atoms;



and (vi) mixtures of any two or more thereof, said copolymers being optionally wholly or partly neutralised at the carboxyl groups by sodium or potassium.

[0064] Highly preferred examples of such carboxylates are 1:1 styrene/maleic acid copolymer, di-isobutylene/maleic acid copolymers and methyl vinyl ether/maleic acid copolymers.

[0065] Other suitable polycarboxylates are poly-a-hydroxy acrylic acids of the general formula

wherein R₁ and R₂ each represent a hydrogen atom or an alkyl group containing 1, 2 or 3 carbon atoms and wherein n represents an integer greater than 3. Such materials may be prepared as described in Belgium Patent 817,678. Aiso suitable are poly- lactenes prepared from the hydroxy acids as describcd in British Patent 1,425,307.

[0066] The compositions of the invention can also be provided in the form of two or more component products, which arc either mixed before use or added separately to a laundry solution to provide a concentration of the ternary surfactant system of from about 100 to about 3000 p.^p.m., especially from about 500 to about 1500 p.p.m. Each component product includes,one or more of the active ingredients of the ternary surfactant system and a mixture of the products in prescribed amounts should have the requisite liquid form. In a preferred embodiment, one product is formulated as a corventional anionic or nonionic detergent composition suitable for use in the main wash cycle of an automatic laundry or washing machine, and the other is formulated as a cationic containing additive or ooster product for use simultaneously with the conventional detergent during the main wash. In addition to the cationic, the additive product will contain nonionic and/or anionic surfactant such that the total composition formed by mixing the component products in specified amounts has the requisite ternary active system.

[0067] ; The compositions of the invention can also be formulated as special prewash compositions designed for used before the main wash siage of the conventional laundering cycle. Such prewash compositions will normally consist of a single product component containing the efined ternary active system.

[0068] In the Examples which follow, the abbreviations used have the following designations:

LAS : Linear C₁₂ alkyl benzene sulfonate

TAS : Tallow alkyl sulfate

AE₃S : Sodium linear C_12-14 alcohol sulfate including ethylene oxide moities.

TAE_n : Tallow alcohol ethoxylated with n moles of ethylene oxide per mole of alcohol

MTMAC : Myristyl trimethyl ammonium chloride

LTMAC : Lauryl trimethyl ammonium chloride

CDMAC : Coconut alkyl dihydroxyethyl methyl ammonium chloride

Dobanol 45-E-7: A C₁₄-C₁₅ oxo-alcohol with 7 moles of ethylene oxide, marketed by Shell.

Dobanol 45-E-4: A C₁₄-C₁₅ oxo-alcohol with 4 moles of ethylene oxide, marketed by Shell.

Silicate : Sodium silicate having an SiO₂:Na₂O ratio of 1.6.

Wax: : Microcrystalline wax - Witcodur 272 M.pt 87°C.

Silicone : Comprising 0.14 parts by weight of an 85:15 by weight mixture of silanated silica and silicone, granulated with 1.3 parts of sodium tripolyphosphate and 0.56 parts of tallow alcohol condensed with 25 molar proportions of ethylene oxide.

Gantrez AN119 : Trade Name for maleic anhydride/vinyl methyl ether copolymer, believed to have an average molecular weight of about 240,000, marketed by GAF. This was prehydrolysed with NaOH before addition.

Brightener : Disodium 4,4' -bis-(2-morpholino-4-anilino-s-triazi -6-ylamino)stilbene-2:2' ;disulphonate.

Dequest 2060 : Trade Name for diethylene triamine penta (methylene phosphonic acid,) marketed by Monsanto

Dequest 2040 : Trade Name for ethylenediamine tetra (methylene phosphonic acid,) marketed by Monsanto.

[0069] 

[0070] . The present invention is illustrated by the following non-limiting examples.

EXAMPLES 1-5

[0071] The following laundry detergent compositions were prepared by mixing all the ingredients in the amounts specified.

EXAMPLES

[0072] 

[0073] These products provide enhanced oil and grease stain removal performance with detriment to particle clay soil detergency, whiteness maintenance and fluorescor brightening characteristics on both natural and man-madc fabrics at both high and low wash temperatures.

[0074] Products with enhanced performance are also obtained when the sodium alkyl benzene sulphonate is replaced by molar equivalents of C₁₀-C₂₂ olefine sulphonates, C₁₀-C₂₀ paraffin sulphonates, and C₁₀-C₂₀ alkyl ether sulphates.

[0075] The lauryl or myristyl trimethyl ammonium chloride in the above examples can be replaced by molar equivalnets of lauryl or myristyl-trimethyl ammonium bromide, decyl trimethyl ammonium chloride, dioctyl dimethyl ammonium bromide, coconut alkyl benzyl dimethyl ammonium chloride, C₁₂ alkylbenzyl dimethyl ethyl ammonium chloride, C₁₂ alkylbenzyl trimethyl ammonium chloride coconut.alkyl dihydroxyethyl methyl ammonium chloride, coconut alkyl dimethyl hydroxymethyl ammonium chloride, coconut alkyl benzyl dihydroxyethyl ammonium chloride or one of the following compounds

EXAMPLES 6-11

[0076] The following laundry detergent compositions were prepared similarly to Examples 1-5.

[0077] These products provide enhanced oil and grease stain removal performance without detriment to particulate clay soil detergency, whiteness maintenance and fluorescer brightening characteristics on both natural and man-made fabrics at both high and low wash temperatures.

[0078] Products with enhanced performance are also obtained when the Dobanol 45-E-7 is replaced by a C_14-15 alcohol polyethoxylate containing an average of 6 moles of ethylene oxide, a C_12-15 alcohol polyethoxylate containing an average of 6.5 moles of ethylene oxide, a C_9-11 alcohol polyethoxylate containing an average of 6 moles of ethylene oxide, a C_12-13 alcohol polyethoxylate containing an average of 5 moles of ethylene oxide stripped so as to remove lower ethoxylate and unethoxylated fractions, a secondary C₁₅ alcohol polyethoxylate containing an average of 9 moles of ethylene oxide, a C₁₂ alcohol polyethoxylate containing an average of 5 moles of ethylene oxide, a C₁₀ alcohol polyethoxylate containins an average of 5 moles of ethylene oxide, a C₁₄ alcohol polyethoxylate containing an average of 6 moles of ethylene oxide, a C₁₂ alcohol polyethoxylate containing an average of ₇ moles of ethylene oxide, and mixtures of those surfactants.

[0079] Enhanced performance is also obtained when Gantrez AN 119 is replaced by, as their sodium salts, a copolymer of methyl methacrylate and maleic acid, the molar ratio of the monomers being about 1:1, of molecular weight about 10,000; an ethylene-maleic acid copolymer of molecular weight about 4,000, a propylene-maleic acid copolymer of molecular weight about 30,000; 1-hexene-maleic acid copolymer of molecular weight about 30,000; 1-hexene-maleic acid copolymer of molecular weight about 25,000; a vinyl pyrrolidone-maleic acid copolymer of molecular weight about 26,000 a styrene-maleic acid copolymer of acrylic acid and itaconic acid; a 1:4 copolymer of 3-butenoic acid and methylenemalonic acid; a 1:1.9 copolymer of methacrylic acid and aconitic acid; and a 1.2:1 copolymer of 4-pentenoic acid and itaconic acid.

[0080] removal performance with detriment to partiele clay noil detergency whiteness maintenance and fluorescer brightening characteristics on both natural and man-made fabries at both high and low wash temperatures.

[0081] Products with enhanced performance are also obtained when the sodium alkyl benzene sulphonate is replaced by molar equivalents of C₁₀-C₂₂ olefine sulphonates, C₁₀-C₂₀ paraffin sulphonates, and C₁₀-C₂₀ alkyl ether sulphates.

[0082] The coconut alkyl dihydroxyethyl methyl ammonium chloride in the above examples can be replaced by molar equivalents of lauryl or myristyl-trimethyl ammonium bromide, decyl trimethyl ammonium chloride, dioctyl dimethyl ammonium bromide, coconut alkyl benzyl dimethyl ammonium chloride chloride, C₁₂ alkylbenzyl dimethyl ethyl ammonium chloride, C₁₂ alkylbenzyl trimethyl ammonium chloride, lauryl or myristyl-trimethyl ammonium chloride, coconut alkyl benzyl dihydroxyethyl ammonium chloride or one of the following compounds

EXAMPLES 12 to 14

[0083] The following laundry detergent compositions were prepared similarly to Examples 1 to 5.

[0084] These products are relatively high sudsing, nil-phosphate containing formulations providing good detergency performance on oily and body soils on both natural and man-made fabrics at both high and low wash temperatures.

EXAMPLES 15 to 18

[0085] The following are examples of two componcnt laundry detergent/additive product compositions of the invention. In use, the two components are mixed either before or after addition to the wash solution in about equal weight proportions giving a total concentration of the ternary surfactant system in the range from about 500 to 1500 p.p.m.

Claims

1. A liquid deterqent composition comprising from 2-100% of a surfactant system consisl ing essent ially of a water- solubie or water-dispersible combination of

(a) from 15 to 45% of an anionic surfactant

(b) a water-solubel quaternary ammonium cationic surfactant in a ratio of anionic:cationic surfactant of less than 5:1

(c) a nonionic surfactant having the formula RO(C₂H₄O)_nH

wherein R is primary or secondary, branched or unbranched C_8-24 alkyl. or alkenyl or C_6-12 alkyl phenyl, and n, the average degree of othoxylation is from 2 to 9, and wherein the ratio of nonionic:cationic surfactant is from 5:1 to 2:3.

2. A composition according to Claim 1 wherein the cationic surfactant comprises from 1 to 4 quaternary ammonium groups of which only has the general formula

wherein each R¹ is a hydrophobic alkyl or alkenyl group optionally substituted or interrupted by phenyl, ether, ester or amide groups totalling from 8 to 20 carbon atoms and which may additionally contain up to 20 ethoxy groups, m is a number from 1 to 3 and no more than one R¹ can have more than 16 carbon atoms when m is 2 and no more than 12 carbon atoms when m is 3, each R² is an alkyl group containing from one to four carbon atoms or a benzyl qroup with more than one R² in a molecule being benzyl and x is from 0 to 3.

3. A composition according to Claim 2 wherein the cationic surfactant has the general formula

wherein R¹ is selected from C₈-C₂₀ alkyl, alkenyl and alkaryl groups; R² is selected from C_1-4 alkyl and benzyl groups; % is an anion in number to give electrical neutrality; and m is 1, 2 or 3; provided that when m is 2, R¹ has less than 15 carbons atoms and when m is 3, R¹ has less than 9 carbon atoms.

4. A composition according to any preceding claim wherein the cationic and anionic surfactant have a combined total of no more than 34 carbon atoms numbered in hydrophobic groups having at least 4 consecutive carbon atoms.

5. A composition according to any preceding claim wherein the nonionic surfactant has the general formula RO(CH₂CH₂O)_nH wherein R is branched or unbranched C₉-C₁₅ alkyl or alkenyl and n is from 3 to 8.

6. A composition according to any preceding claim wherein the nonionic:cationic surfactant weight ratio is from 5:1 to 5;3.

7. A composition according to any preceding claim wherein the anionic:cationic surfactant weight ratio is from 2:1 to 1:2.

8. A composition according to any preceding claim wherein the surfactant system comprises at least 10% by weight of the cationic surfactant and at least 60% by weight in total of the anionic and nonionic surfactants.

9.. A composition according to any preceding claim comprising from 1% to 70% of water-soluble inorganic or organic electrolyte.

10. A composition according to any preceding claim additionally comprising from 0.01 to 2% of an anionic fluorescer.