GB2315764A - Detergent comprising surfactant, acid source and alkaline source - Google Patents

Abstract

A detergent composition is selected from: (i) a particulate base composition having a core which comprises a solid surfactant and an alkaline source, and an outer layer comprising an acid source; (ii) a particulate base composition comprising an alkaline source and having a core comprising an acid source, and an outer layer comprising a surfactant. A process for the manufacture of a detergent composition is selected from: (i) admixture of a solid surfactant with an alkaline source, and coating at least said surfactant with an acid source; (ii) making a base composition comprising a solid acid source, coating said source with a surfactant, and further adding an alkaline source. A gas is produced on reaction of the acid source and alkaline source. The alkaline source is preferably selected from an alkali metal carbonate, alkali metal bicarbonate, alkali metal sesquicarbonate, alkali metal percarbonate, alkaline earth metal carbonate, alkaline earth metal bicarbonate or alkaline earth metal sesquicarbonate. The acid source may be selected from organic acids (preferably citric acid, glutaric acid, succinic acid or adipic acid) and inorganic (including mineral) acids (preferably monosodium phosphate, sodium hydrogen sulphate or boric acid).

Description

A Process and Composition for Detergents Technical Field The present invention relates to a process for making a detergent composition which is suitable for use in laundry and dish washing methods. The present invention also relates to a detergent composition, and, particularly, but not exclusively, to detergent compositions made by the process.

Background to the Invention There is a trend amongst commercially available granular detergents towards higher bulk densities and towards granular detergent compositions which have a higher content of detergent active ingredients. Such detergents offer greater convenience to the consumer and at the same time reduce the amount of packaging materials which will, ultimately, be disposed of.

Many of the prior art attempts to move in this direction have met with problems of poor solubility properties arising from low rate of dissolution or the formation of gels. A consequence of this in a typical washing process can be poor dispensing of the product, either from the dispensing drawer of a washing machine, or from a dosing device placed with the laundry inside the machine. This poor dispensing is often caused by gelling of particles, which have high levels of surfactant, upon contact with water. The gel prevents a proportion of the detergent powder from being solubilized in the wash water which reduces the effectiveness of the powder. This is a particular problem at low water pressures and/or at lower washing temperatures.

Further, there has been another recent trend towards reducing or elirninating the use of phosphate builders, which have generally been replaced with zeolite (crystalline aluminosilicate). Detergents containing zeolite builders have been found to be poorer dispensers than detergents containing phosphate builders.

EP-A-0 578 871 describes a process which seeks to make a high bulk density detergent composition which dissolves rapidly and dispenses effectively. The process involves formulating a base powder with a particle size distribution between 150 microns and 1700 microns in combination with additional filler ingredients whereby at least 20% by weight of the filler particles is less than 150 microns. The filler particles include salts of citrate, sulphate, (bi-)carbonate and silicates.

WO95/14767 relates to the poor dispensing of high density, non-spray-dried detergent powders, and discloses the use of a citric acid salt which has a Rosin Rammler particle size of less than 800 microns.

W094/28098 discloses a non-spray-dried detergent powder comprising a combination of an ethoxylated primary C8-18 alcohol, an alkali metal aluminosilicate builder and 5 to 40 wt% of a water-soluble salt of a citric acid.

EP-A-0 639 637 discloses the replacement of perborate bleach with an alkali metal percarbonate to improve the dispensing profile and dissolution rate of a detergent. Citrate or mixtures of citrate with sulphate or carbonate can be used to coat the percarbonate bleach. EP-A-0 639 639 contains a similar disclosure in this respect.

Other ways to improve dispensing include the use of an effervescence system. If the detergent contains an effervescence system then the generation of a gas such as carbon dioxide pushes the particles of the detergent apart, and prevents them from gelling.

The use of effervescence to improve the dispersibility of granular materials has been used extensively in pharmaceutical preparations. The most widely used effervescent system in this respect is citric acid in combination with bicarbonate. The use of this simple effervescent system has also been described for improving the dispersibility of pesticidal compositions for controlling water-borne pests, e.g. GB-A-2,184,946.

US-A-4,414,130 discloses the use of a readily disintegratable builder particle with a zeolite-based detergent. It also discloses the use of an effervescence material to improve the dissolving and dissolution of the particles. Sodium carbonate or sodium bicarbonate may be combined with the zeolite binder mix and the balance of the detergent may include citric acid, monosodium phosphate, boric acid or other suitable acidifying material, preferably encapsulated or agglomerated with bicarbonate, for reaction with it to generate carbon dioxide.

WO92/18596 discloses that improved solubility/dispersion for granular detergents can be achieved by admixing sodium carbonate and citric acid in a specified weight ratio of from 2:1 to 15:1.

EP-A-0 534 525 discloses the use of citric acid with a specified particle size range of 350 to 1500 microns.

The addition of citric acid results in a reduction in alkalinity. Such an alkaline pH promotes cleaning, stain removal and soil suspension, there is need to minimize the level of citric acid used. Also citric acid is a relatively expensive ingredient which further reinforces the need to keep the level of citric acid very low. We have also surprisingly found that the present invention allows low levels of the acid to be satisfactorily used in the detergent composition.

All documents cited in the present description are, in relevant part, incorporated herein by reference.

Summary of the Invention According to one aspect of the present invention there is provided a process for making a detergent composition comprising: i) making a detergent base composition comprising a particulate detergent surfactant and an alkaline source; and ii) coating at least the particulate detergent surfactant with an acid source and a nonionic surfactant; and wherein the alkaline source and the acid source are capable of reacting together to produce a gas.

According to another aspect of the present invention there is provided a detergent composition produced by the process of the present invention.

According to yet another aspect of the present invention there is provided a detergent composition comprising a base composition comprising a solid detergent surfactant and optionally an alkaline source, wherein at least the solid detergent surfactant is coated with an acid source and a nonionic surfactant.

According to a further aspect of the present invention there is provided a detergent composition comprising a particulate base composition having a core which comprises a solid detergent surfactant and optionally an alkaline source, and an outer layer comprising an acid source and a nonionic surfactant.

Surprisingly, we have also found that the same benefical effects are acheived when the process is reversed.

Thus, according to one aspect of the present invention there is provided a process for making a detergent composition comprising: i) making a detergent base composition comprising a solid acid source; ii) coating the solid acid source with a detergent surfactant; and iii) further adding an alkaline source; and wherein the alkaline source and the acid source are capable of reacting together to produce a a gas.

According to another aspect of the present invention there is provided a detergent composition produced by this process of the present invention.

According to yet another aspect of the present invention there is provided a detergent composition comprising a base composition comprising a solid acid source and an alkaline source, and at least the solid acid source is coated with a detergent surfactant.

According to a further aspect of the present invention there is provided a detergent composition comprising a particulate base composition comprising an alkaline source and having a core which comprises a solid acid source, and an outer layer comprising a detergent surfactant.

In a preferred embodiment of the present invention there is provided a detergent composition having multiple discrete layers.

Detailed Descnption of the Invention The detergent composition can be in the form of a powder or a granulate.

In one embodiment of the present invention, such compositions comprise a base composition containing one or more surfactants, and preferably a builder. The base composition may be prepared by spray-drying and dry-mixing/agglomeration. The base composition may also comprise the particulate alkaline source. Alternatively the alkaline source may be added as a separate component to the detergent base composition, preferably in granular form and delivered by dry-adding. It will be appreciated that when the alkaline source is added as a separate component to the base composition in order to improve the storage stability of the detergent it is preferable to coat the base composition with the nonionic surfactant/acid source mix prior to the addition of the alkaline source. Although any convenient technique could be used for coating the detergent surfactant, in an especially preferred embodiment the nonionic surfactant/acid source mix is sprayed on to the detergent surfactant. More particularly the acid source is mixed with liquid nonionic surfactant and then sprayed on to the particle.

In a preferred embodiment of the present invention the particulate detergent surfactant of the base composition is different from the nonionic surfactant with which it is coated.

In an especially preferred embodiment the particulate detergent surfactant is not a nonionic surfactant.

In a second embodiment of the present invention, the compositions comprise a base composition containing one or more acid source, and preferably a builder. The base composition may be prepared by spray-drying and dry-mixing/agglomeration. The base composition may also comprise the alkaline source material. Alternatively the alkaline source may be added as a separate component to the detergent base composition, preferably in granular form and delivered by dry-adding. It will be appreciated that when the alkaline source is added as a separate component to the base composition in order to improve the storage stability of the detergent it is preferable to coat the base composition with the nonionic surfactant/acid source mix prior to the addition of the alkaline source.

In another embodiment, the alkaline source material coats the base composition.

Although any convenient technique could be used for coating the acid source, in an especially preferred embodiment the nonionic surfactant/detergent surfactant mix is sprayed on to the detergent surfactant. More particularly the detergent surfactant is mixed with liquid nonionic surfactant and then sprayed on to the particle.

In a preferred embodiment of the present invention the detergent surfactant of the coating is different from the nonionic surfactant with which it coats the base. In an especially preferred embodiment the detergent surfactant is not a nonionic surfactant.

It will be appreciated that the detergent composition of the present invention can be built up in layers around a base composition. The base composition may comprise the acid source or detergent surfactant and/or alkalinity source. The other components then coat this base composition. The use of such layers allows the amount of acid used to be reduced compared to conventional compositions, whilst still provided efficient dispersion of the detergent.

The essential, and optional, ingredients of the present invention will now be described below in detail.

A. Detergent Surfactant This ingredient is preferably present in an amount of from 1% to 90%, preferably 3% to 70%, more preferably 5% to 40%, even more preferably 10% to 30%, most preferably 12% to 25% by weight of the detergent composition. Preferably the detergent is selected from anionics, nonionics, zwitterionics, ampholytics, amphoteric, cationics and mixtures thereof. Preferably the surfactant is anionic, nonionic or a mixture thereof. When the composition contains more than one surfactant the additional surfactant is preferably present at a level of from 0.1% to 50%, more preferably from 1% to 40%, most preferably from 5% to 30% by weight of the total surfactant present. Where present, ampholytic, amphoteric and zwitterionic surfactants are generally used in combiantion with one or more anionic and/or nonionic surfactants.

Anionic surfactant The surfactant system may include an anionic surfactant. Essentially any anionic surfactants useful for detersive purposes are suitable. These can include salts (including, for example, sodium, potassium, ammonium, and substituted ammonium salts such as mono-, di- and triethanolamine salts) of the anionic sulfate, sulfonate, carboxylate and sarcosinate surfactants. Anionic sulfate surfactants are preferred.

Other anionic surfactants include the isethionates such as the acyl isethionates, N-acyl taurates, fatty acid amides of methyl tauride, alkyl succinates and sulfosuccinates, monoesters of sulfosuccinate (especially saturated and unsaturated C1 2-C18 monoesters) diesters of sulfosuccinate (especially saturated and unsaturated C6-C14 diesters), N-acyl sarcosinates. Resin acids and hydrogenated resin acids are also suitable, such as rosin, hydrogenated rosin, and resin acids and hydrogenated resin acids present in or derived from tallow oil.

Anionic sulfate surfactant Anionic sulfate surfactants suitable for use herein include the linear and branched primary and secondary alkyl sulfates, alkyl ethoxysulfates, fatty oleoyl glycerol sulfates, alkyl phenol ethylene oxide ether sulfates, the C5-C17 acyl-N-(C1-C4 alkyl) and -N-(C1-C2 hydroxyalkyl) glucamine sulfates, and sulfates of alkylpolysaccharides such as the sulfates of alkylpolyglucoside (the nonionic nonsulfated compounds being described herein).

Alkyl sulfate surfactants are preferably selected from the linear and branched primary C10-C18 alkyl sulfates, more preferably the C1 l-Cls branched chain alkyl sulfates and the C12-C14 linear chain alkyl sulfates.

Alkyl ethoxysulfate surfactants are preferably selected from the group consisting of the C10-C18 alkyl sulfates which have been ethoxylated with from 0.5 to 20 moles of ethylene oxide per molecule. More preferably, the alkyl ethoxysulfate surfactant is a C11 - C18, most preferably C 1 l-Cl s alkyl sulfate which has been ethoxylated with from 0.5 to 7, preferably from 1 to 5, moles of ethylene oxide per molecule.

A particularly preferred aspect of the invention employs mixtures of the preferred alkyl sulfate and alkyl ethoxysulfate surfactants. Such mixtures have been disclosed in PCT Patent Application No. WO 93/18124.

Anionic sulfonate surfactant Anionic sulfonate surfactants suitable for use herein include the salts of C5-C20 linear alkylbenzene sulfonates, alkyl ester sulfonates, C6-C22 primary or secondary alkane sulfonates, C6-C24 olefin sulfonates, sulfonated polycarboxylic acids, alkyl glycerol sulfonates, fatty acyl glycerol sulfonates, fatty oleyl glycerol sulfonates, and any mixtures thereof.

Anionic carboxvlate surfactant Suitable anionic carboxylate surfactants include the alkyl ethoxy carboxylates, the alkyl polyethoxy polycarboxylate surfactants and the soaps ('alkyl carboxyls'), especially certain secondary soaps as described herein.

Suitable alkyl ethoxy carboxylates include those with the formula RO(CH2CH20)X CH2C00-M+ wherein R is a C6 to C18 alkyl group, x ranges from 0 to 10, and the ethoxylate distribution is such that, on a weight basis, the amount of material where x is 0 is less than 20 % and M is a cation. Suitable alkyl polyethoxy polycarboxylate surfactants include those having the formula RO-(CHRl-CHR2-O)x-R3 wherein R is a C6 to C18 alkyl group, x is from 1 to 25, R1 and R2 are selected from the group consisting of hydrogen, methyl acid radical, succinic acid radical, hydroxysuccinic acid radical, and mixtures thereof, and R3 is selected from the group consisting of hydrogen, substituted or unsubstituted hydrocarbon having between 1 and 8 carbon atoms, and mixtures thereof.

Suitable soap surfactants include the secondary soap surfactants which contain a carboxyl unit connected to a secondary carbon. Preferred secondary soap surfactants for use herein are water-soluble members selected from the group consisting of the water-soluble salts of 2methyl1 -undecanoic acid, 2ethyl- 1 -decanoic acid, 2-propyl- 1 -nonanoic acid, 2butyl-1-octanoic acid and 2-pentyl-l-heptanoic acid. Certain soaps may also be included as suds suppressors.

Alkali metal sarcosmate surfactant Other suitable anionic surfactants are the alkali metal sarcosinates of formula R-CON (R1) CH2 COOM, wherein R is a Cg-C17 linear or branched alkyl or alkenyl group, R1 is a C 1 -C4 alkyl group and M is an alkali metal ion. Preferred examples are the myristyl and oleoyl methyl sarcosinates in the form of their sodium salts.

Cationic ester surfactant The surfactant system may include a cationic ester surfactant. That is, a preferably water dispersible compound having surfactant properties comprising at least one ester (ie COO-) linkage and at least one cationically charged group.

Suitable cationic ester surfactants, including choline ester surfactants, have for example been disclosed in US Patents No.s 4228042, 4239660 and 4260529.

Preferred cationic ester surfactants are those having the formula:

wherein R1 is a C5-C31 linear or branched alkyl, alkenyl or alkaryl chain or M-,N+(R6R7Rs)(CH2)s; X and Y, independently, are selected from the group consisiting of COO, OCO, O, CO, OCOO, CONH, NHCO, OCONH and NHCOO wherein at least one of X or Y is a COO, OCO, OCOO, OCONH orNHCOO group; R2, R3, R4, Rg, R7, and R8 are independently selected from the group consisting of alkyl, alkenyl, hydroxyalkyl, hydroxy-alkenyl and alkaryl groups having from 1 to 4 carbon atoms; and R5 is independently H or a C1 -C3 alkyl group; wherein the values of m, n, s and t independently lie in the range of from 0 to 8, the value of b lies in the range from 0 to 20, and the values of a, u and v independently are either 0 or 1 with the proviso that at least one of u or v must be 1; and wherein M is a counter anion.

Preferably R2,R3 and R4 are independently selected from CH3 and -CH2CH2OH.

Preferably M is selected from the group consisting of halide, methyl sulfate, sulfate, and nitrate, more preferably methyl sulfate, chloride, bromide or iodide.

Preferred water dispersible cationic ester surfactants are the choline esters having the formula:

wherein R1 is a C11-Clg linear or branched alkyl chain.

Particularly preferred choline esters of this type include the stearoyl choline ester quaternary methylammonium halides (R1=C17 alkyl), palmitoyl choline ester quaternary methylammonium halides (Rl=Cls alkyl), myristoyl choline ester quaternary methylammonium halides (R1 =C13 alkyl), lauroyl choline ester methylammonium halides (R1=C11 alkyl), cocoyl choline ester quaternary methylammonium halides (R1 =C11 C13 alkyl), tallowyl choline ester quatemary methylammonium halides (R1=C15.C17 alkyl), and any mixtures thereof.

The particularly preferred choline esters, given 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, preferably in the presence of a solvent such as ethanol, propylene glycol or preferably a fatty alcohol ethoxylate such as C 1 o-C 18 fatty alcohol ethoxylate having a degree of ethoxylation of from 3 to 50 ethoxy groups per mole forming the desired cationic material. They may also be prepared by the direct esterification of a long chain fatty acid of the desired chain length together with 2-haloethanol, in the presence of an acid catalyst material. The reaction product is then quaternized with trimethylamine, forming the desired cationic material.

Other suitable cationic ester surfactants have the structural formulas below, wherein d may be from 0 to 20.

In a preferred aspect the cationic ester surfactant is hydrolysable under the conditions of a laundry wash method.

Alkoxvlated nonionic surfactant Essentially any alkoxylated nonionic surfactants are suitable herein. The ethoxylated and propoxylated nonionic surfactants are preferred.

Preferred alkoxylated surfactants can be selected from the classes of the nonionic condensates of alkyl phenols, nonionic ethoxylated alcohols, nonionic ethoxylated/propoxylated fatty alcohols, nonionic ethoxylate/propoxylate condensates with propylene glycol, and the nonionic ethoxylate condensation products with propylene oxide/ethylene diamine adducts.

Nomomc alkoxvlated alcohol surfactant The condensation products of aliphatic alcohols with from 1 to 25 moles of alkylene oxide, particularly ethylene oxide and/or propylene oxide, are suitable for use herein. The alkyl chain of the aliphatic alcohol can either be straight or branched, primary or secondary, and generally contains from 6 to 22 carbon atoms. Particularly preferred are the condensation products of alcohols having an alkyl group containing from 8 to 20 carbon atoms with from 2 to 10 moles of ethylene oxide per mole of alcohol.

Nonionic polyhydroxy fatty acid amlde surfactant Polyhydroxy fatty acid amides suitable for use herein are those having the structural formula R2CONR1Z wherein : R1 is H, C1-C4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl, ethoxy, propoxy, or a mixture thereof, preferable C1-C4 alkyl, more preferably C1 or C2 alkyl, most preferably C1 alkyl (i.e., methyl); and R2 is a C5-C31 hydrocarbyl, preferably straight-chain Cs-C1g alkyl or alkenyl, more preferably straight-chain Cg-C17 alkyl or alkenyl, most preferably straight-chain C11-C17 alkyl or alkenyl, or mixture thereof; and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative (preferably ethoxylated or propoxylated) thereof. Z preferably will be derived from a reducing sugar in a reductive amination reaction; more preferably Z is a glycityl.

Nonionic fatty acid amlde surfactant Suitable fatty acid amide surfactants include those having the formula: R6CON(R7)2 wherein R6 is an alkyl group containing from 7 to 21, preferably from 9 to 17 carbon atoms and each R7 is selected from the group consisting of hydrogen, C 1 -C4 alkyl, C1 C4 hydroxyalkyl, and -(C2H4O)XH, where x is in the range of from 1 to 3.

Nonionic alkvlpolvsacchande surfactant Suitable alkylpolysaccharides for use herein are disclosed in U.S. Patent 4,565,647, Llenado, issued January 21, 1986, having a hydrophobic group containing from 6 to 30 carbon atoms and a polysaccharide, e.g., a polyglycoside, hydrophilic group containing from 1.3 to 10 saccharide units.

Preferred alkylpolyglycosides have the formula R20(C,H2nO)t(glycosy1X, wherein R2 is selected from the group consisting of alkyl, alkylphenyl, hydroxyalkyl, hydroxyalkylphenyl, and mixtures thereof in which the alkyl groups contain from 10 to 18 carbon atoms; n is 2 or 3; t is from 0 to 10, andx is from 1.3 to 8. The glycosyl is preferably derived from glucose.

Amphoteric surfactant Suitable amphoteric surfactants for use herein include the amine oxide surfactants and the alkyl amphocarboxylic acids.

Suitable amine oxides include those compounds having the formula R3(0R4)XN0(R5)2 wherein R3 is selected from an alkyl, hydroxyalkyl, acylamidopropoyl and alkyl phenyl group, or mixtures thereof, containing from 8 to 26 carbon atoms; R4 is an alkylene or hydroxyalkylene group containing from 2 to 3 carbon atoms, or mixtures thereof; x is from 0 to 5, preferably from 0 to 3; and each R5 is an alkyl or hydroxyalkyl group containing from 1 to 3, or a polyethylene oxide group containing from 1 to 3 ethylene oxide groups. Preferred are C1 0-C18 alkyl dimethylamine oxide, and C1 0-18 acylamido alkyl dimethylamine oxide.

A suitable example of an alkyl aphodicarboxylic acid is Miranol(TM) C2M Conc.

manufactured by Miranol, Inc., Dayton, NJ.

Zwlttenomc surfactant Zwitterionic surfactants can also be incorporated into the detergent compositions hereof.

These surfactants can be broadly described as derivatives of secondary and tertiary amines, derivatives of heterocyclic secondary and tertiary amines, or derivatives of quaternary ammonium, quaternary phosphonium or tertiary sulfonium compounds.

Betaine and sultaine surfactants are exemplary zwitterionic surfactants for use herein.

Suitable betaines are those compounds having the formula R(R')2N+R2COO- wherein R is a C6-C18 hydrocarbyl group, each R1 is typically C1-C3 alkyl, and R2 is a C1-Cs hydrocarbyl group. Preferred betaines are C12-18 dimethyl-ammonio hexanoate and the C1 0-18 acylamidopropane (or ethane) dimethyl (or diethyl) betaines. Complex betaine surfactants are also suitable for use herein.

Cationic surfactants Additional cationic surfactants can also be used in the detergent compositions herein.

Suitable cationic surfactants include the quaternary ammonium surfactants selected from mono C6-C16, preferably C6-C10 N-alkyl or alkenyl ammonium surfactants wherein the remaining N positions are substituted by methyl, hydroxyethyl or hydroxypropyl groups.

B. Source of Alkali In accordance with the present invention, an alkalinity system may be present in the detergent composition such that it has the capacity to react with the source of acidity to produce a gas. Preferably this gas is carbon dioxide, and therefore the alkali is a carbonate, or suitable derivative thereof.

The detergent composition of the present invention preferably contains from about 2% to about 75%, preferably from about 5% to about 60%, most preferably from about 10% to about 30% by weight of the alkali source. When the alkali source is present in an agglomerated detergent particle, the agglomerate preferably contains from about 10% to about 60% of the alkali source.

In a preferred embodiment, the alkalinity source is a carbonate. Examples of preferred carbonates are the alkaline earth and alkali metal carbonates, including sodium carbonate, bicarbonate and sesquicarbonate and any mixtures thereof with ultra-fine calcium carbonate such as are disclosed in German Patent Application No. 2,321,001 published on November 15, 1973. Alkali metal percarbonate salts are also suitable sources of carbonate species and are described in more detail in the section 'inorganic perhydrate salts' herein.

Other suitable sources will be known to those skilled in the art.

The alkalinity source may include other components, such as is a silicate. Suitable silicates include the water soluble sodium silicates with an Si02: Na20 ratio of from 1.0 to 2.8, with ratios of from 1.6 to 2.0 being preferred, and 2.0 ratio being most preferred.

The silicates may be in the form of either the anhydrous salt or a hydrated salt. Sodium silicate with an SiO2: Na20 ratio of 2.0 is the most preferred silicate. Alkali metal persilicates are also suitable sources of silicate herein.

Preferred crystalline layered silicates for use herein have the general formula NaMSixO2x+1 .yH20 wherein M is sodium or hydrogen, x is a number from 1.9 to 4 and y is a number from 0 to 20. Crystalline layered sodium silicates of this type are disclosed in EP-A-0164514 and methods for their preparation are disclosed in DE-A-3417649 and DE-A-3742043.

Herein, x in the general formula above preferably has a value of 2, 3 or 4 and is preferably 2. The most preferred material is 6-Na2Si205, available from Hoechst AG as NaSKS-6.

C. Nonionic surfactant This component may be one or more of the nonionic surfactants described above under A.

The nonionic surfactant is preferably in a liquid form. In one embodiment it is mixed with the acid source for application to the surfactant of the base of the acid source preferably has a particle size below about 350 microns. The particle size may be calculated using a Tyler sieve.

The source of acidity may be any suitable organic, mineral or inorganic acid, or a derivative thereof, or a mixture thereof. The source of acidity may be a mono-, bi- or triprotonic acid. Preferred derivatives include a salt or ester of the acid. The source of acidity is preferably nonhygroscopic, in order to improve storage stability. Organic acids and their derivatives are preferred. The acid is preferably water-soluble. Suitable acids include citric, glutaric, succinic or adipic acid, monosodium phosphate, sodiumhydrogensulfate, boric acid, or a salt or an ester thereof. Citric acid is especially preferred.

Other suitable sources will be known to those skilled in the art.

Additional detergent components The detergent compositions of the invention may also contain additional detergent components. The precise nature of these additional components, and levels of incorporation thereof will depend on the physical form of the composition, and the precise nature of the washing operation for which it is to be used.

The compositions of the invention preferably contain one or more additional detergent components selected from additional surfactants, bleaches, builders, organic polymeric compounds, enzymes, suds suppressers, lime soap dispersants, soil suspension and antiredeposition agents and corrosion inhibitors.

Water-soluble builder compound The detergent compositions of the present invention preferably contain a water-soluble builder compound, typically present at a level of from 1% to 80% by weight, preferably from 10% to 70% by weight, most preferably from 20% to 60% by weight ofthe composition.

Suitable water-soluble builder compounds include the water soluble monomeric polycarboxylates, or their acid forms, homo or copolymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxylic radicals separated from each other by not more that two carbon atoms, borates, phosphates, and mixtures of any of the foregoing.

The carboxylate or polycarboxylate builder can be monomeric or oligomeric in type although monomeric polycarboxylates are generally preferred for reasons of cost and performance.

Suitable carboxylates containing one carboxy group include the water soluble salts of lactic acid, glycolic acid and ether derivatives thereof. Polycarboxylates containing two carboxy groups include the water-soluble salts of succinic acid, malonic acid, (ethylenedioxy) diacetic acid, maleic acid, diglycolic acid, tartaric acid, tartronic acid and fumaric acid, as well as the ether carboxylates and the sulfinyl carboxylates.

Polycarboxylates containing three carboxy groups include, in particular, water-soluble citrates, aconitrates and citraconates as well as succinate derivatives such as the carboxymethyloxysuccinates described in British Patent No. 1,379,241, lactoxysuccinates described in British Patent No. 1,389,732, and aminosuccinates described in Netherlands Application 7205873, and the oxypolycarboxylate materials such as 2-oxa-1,1,3-propane tricarboxylates described in British Patent No. 1,387,447.

Polycarboxylates containing four carboxy groups include oxydisuccinates disclosed in British Patent No. 1,261,829, 1,1,2,2-ethane tetracarboxylates, 1,1,3,3-propane tetracarboxylates and 1,1,2,3-propane tetracarboxylates. Polycarboxylates containing sulfo substituents include the sulfosuccinate derivatives disclosed in British Patent Nos.

1,398,421 and 1,398,422 and in U.S. Patent No. 3,936,448, and the sulfonated pyrolysed citrates described in British Patent No. 1,439,000. Preferred polycarboxylates are hydroxycarboxylates containing up to three carboxy groups per molecule, more particularly citrates.

The parent acids of the monomeric or oligomeric polycarboxylate chelating agents or mixtures thereof with their salts, e.g. citric acid or citrate/citric acid mixtures are also contemplated as useful builder components.

Borate builders, as well as builders containing borate-forming materials that can produce borate under detergent storage or wash conditions are useful water-soluble builders herein.

Suitable examples of water-soluble phosphate builders are the alkali metal tripolyphosphates, sodium, potassium and ammonium pyrophosphate, sodium and potassium and ammonium pyrophosphate, sodium and potassium orthophosphate, sodium polymeta/phosphate in which the degree of polymerization ranges from about 6 to 21, and salts of phytic acid.

Partially soluble or insoluble builder compound The detergent compositions of the present invention may contain a partially soluble or insoluble builder compound, typically present at a level of from 1% to 80% by weight, preferably from 10% to 70% by weight, most preferably from 20% to 60% weight of the composition.

Examples of largely water insoluble builders include the sodium aluminosilicates.

Suitable aluminosilicate zeolites have the unit cell formula Naz[(AlO2)z(SiO2)y]. xH2O wherein z andy are at least 6; the molar ratio of z to y is from 1.0 to 0.5 and x is at least 5, preferably from 7.5 to 276, more preferably from 10 to 264. The aluminosilicate material are in hydrated form and are preferably crystalline, containing from 10% to 28%, more preferably from 18% to 22% water in bound form.

The aluminosilicate zeolites can be naturally occurring materials, but are preferably synthetically derived. Synthetic crystalline aluminosilicate ion exchange materials are available under the designations Zeolite A, Zeolite B, Zeolite P, Zeolite X, Zeolite HS and mixtures thereof. Zeolite A has the formula Na 12 [AlO2) 12 (SiO2)12]. xH2O wherein x is from 20 to 30, especially 27. Zeolite X has the formula Na86 [(AlO2)86(SiO2)106]. 276 H2O.

Organic peroxyacid bleaching system A preferred feature of detergent compositions of the invention is an organic peroxyacid bleaching system. In one preferred execution the bleaching system contains a hydrogen peroxide source and an organic peroxyacid bleach precursor compound. The production of the organic peroxyacid occurs by an in situ reaction of the precursor with a source of hydrogen peroxide. Preferred sources of hydrogen peroxide include inorganic perhydrate bleaches. In an alternative preferred execution a preformed organic peroxyacid is incorporated directly into the composition. Compositions containing mixtures of a hydrogen peroxide source and organic peroxyacid precursor in combination with a preformed organic peroxyacid are also envisaged.

Inorganic perhydrate bleaches Inorganic perhydrate salts are a preferred source of hydrogen peroxide. These salts are normally incorporated in the form of the alkali metal, preferably sodium salt at a level of from 1% to 40% by weight, more preferably from 2% to 30% by weight and most preferably from 5% to 25% by weight of the compositions.

Examples of inorganic perhydrate salts include perborate, percarbonate, perphosphate, persulfate and persilicate salts. The inorganic perhydrate salts are normally the alkali metal salts. The inorganic perhydrate salt may be included as the crystalline solid without additional protection. For certain perhydrate salts however, the preferred executions of such granular compositions utilize a coated form of the material which provides better storage stability for the perhydrate salt in the granular product. Suitable coatings comprise inorganic salts such as alkali metal silicate, carbonate or borate salts or mixtures thereof, or organic materials such as waxes, oils, or fatty soaps.

Sodium perborate is a preferred perhydrate salt and can be in the form of the monohydrate of nominal formula NaBO2H202 or the tetrahydrate NaBO2H202.3H2O.

Alkali metal percarbonates, particularly sodium percarbonate are preferred perhydrates herein. Sodium percarbonate is an addition compound having a formula corresponding to 2Na2C03.3H202, and is available commercially as a crystalline solid.

Potassium peroxymonopersulfate is another inorganic perhydrate salt of use in the detergent compositions herein.

Peroxyacid bleach precursor Peroxyacid bleach precursors are compounds which react with hydrogen peroxide in a perhydrolysis reaction to produce a peroxyacid. Generally peroxyacid bleach precursors may be represented as

where L is a leaving group and X is essentially any functionality, such that on perhydroloysis the structure of the peroxyacid produced is

Peroxyacid bleach precursor compounds are preferably incorporated at a level of from 0.5% to 20% by weight, more preferably from 1% to 15% by weight, most preferably from 1.5% to 10% by weight ofthe detergent compositions.

Suitable peroxyacid bleach precursor compounds typically contain one or more N- or O- acyl groups, which precursors can be selected from a wide range of classes. Suitable classes include anhydrides, esters, imides, lactams and acylated derivatives of imidazoles and oximes. Examples of useful materials within these classes are disclosed in GB-A1586789. Suitable esters are disclosed in GB-A-836988, 864798, 1147871, 2143231 and EP-A-0170386.

Leaving groups The leaving group, hereinafter L group, must be sufficiently reactive for the perhydrolysis reaction to occur within the optimum time frame (e.g., a wash cycle). However, if L is too reactive, this activator will be difficult to stabilize for use in a bleaching composition.

Preferred L groups are selected from the group consisting of:

and mixtures thereof, wherein R is an alkyl, aryl, or alkaryl group containing from 1 to 14 carbon atoms, R is an alkyl chain containing from 1 to 8 carbon atoms, R4 is H or 3 1 3 4 R3, and Y is H or a solubilizing group. Any of R1, R3 and R4 may be substituted by essentially any functional group including, for example alkyl, hydroxy, alkoxy, halogen, amine, nitrosyl, amide and ammonium or alkyl ammmonium groups The preferred solubilizing groups are -SO3M+, -CO2M+, -SO4M+, -N+(R3)4X and O < --N(R3 )3 and most preferably -SO3-M+ and -CO2-M+ wherein R3 is an alkyl chain containing from 1 to 4 carbon atoms, M is a cation which provides solubility to the bleach activator and X is an anion which provides solubility to the bleach activator. Preferably, M is an alkali metal, ammonium or substituted ammonium cation, with sodium and potassium being most preferred, and X is a halide, hydroxide, methylsulfate or acetate anion.

Alkyl percarboxylic acid bleach precursors Alkyl percarboxylic acid bleach precursors form percarboxylic acids on perhydrolysis.

Preferred precursors of this type provide peracetic acid on perhydrolysis.

Preferred alkyl percarboxylic precursor compounds of the imide type include the N ,N,N1N1 tetra acetylated alkylene diamines wherein the alkylene group contains from 1 to 6 carbon atoms, particularly those compounds in which the alkylene group contains 1, 2 and 6 carbon atoms. Tetraacetyl ethylene diamine (TAED) is particularly preferred.

Other preferred alkyl percarboxylic acid precursors include sodium 3,5,5-tri-methyl hexanoyloxybenzene sulfonate (iso-NOBS), sodium nonanoyloxybenzene sulfonate (NOBS), sodium acetoxybenzene sulfonate (ABS) and pentaacetyl glucose.

Amide substituted alkyl peroxyacid precursors Amide substituted alkyl peroxyacid precursor compounds are suitable herein, including those of the following general formulae:

wherein R1 is an alkyl group with from 1 to 14 carbon atoms, R2 is an alkylene group containing from 1 to 14 carbon atoms, and R5 is H or an alkyl group containing 1 to 10 carbon atoms and L can be essentially any leaving group. Amide substituted bleach activator compounds of this type are described in EP-A-0170386.

Perbenzoic acid precursor Perbenzoic acid precursor compounds provide perbenzoic acid on perhydrolysis. Suitable O-acylated perbenzoic acid precursor compounds include the substituted and unsubstituted benzoyl oxybenzene sulfonates, and the benzoylation products of sorbitol, glucose, and all saccharides with benzoylating agents, and those of the imide type including N-benzoyl succinimide, tetrabenzoyl ethylene diamine and the N-benzoyl substituted ureas. Suitable imidazole type perbenzoic acid precursors include N-benzoyl imidazole and N-benzoyl benzimidazole. Other useful N-acyl group-containing perbenzoic acid precursors include N-benzoyl pyrrolidone, dibenzoyl taurine and benzoyl pyroglutamic acid.

Cationic peroxyacid precursors Cationic peroxyacid precursor compounds produce cationic peroxyacids on perhydrolysis.

Typically, cationic peroxyacid precursors are formed by substituting the peroxyacid part of a suitable peroxyacid precursor compound with a positively charged functional group, such as an ammonium or alkyl ammonium group, preferably an ethyl or methyl ammonium group. Cationic peroxyacid precursors are typically present in the solid detergent compositions as a salt with a suitable anion, such as a halide ion.

The peroxyacid precursor compound to be so cationically substituted may be a perbenzoic acid, or substituted derivative thereof, precursor compound as described hereinbefore. Alternatively, the peroxyacid precursor compound may be an alkyl percarboxylic acid precursor compound or an amide substituted alkyl peroxyacid precursor as described hereinafter Cationic peroxyacid precursors are described in U.S. Patents 4,904,406; 4,751,015; 4,988,451; 4,397,757; 5,269,962; 5,127,852; 5,093,022; 5,106,528; U.K. 1,382,594; EP 475,512, 458,396 and 284,292; and in JP 87-318,332.

Examples of preferred cationic peroxyacid precursors are described in UK Patent Application No. 9407944.9 and US Patent Application Nos. 08/298903, 08/298650, 08/298904 and 08/298906.

Suitable cationic peroxyacid precursors include any of the ammonium or alkyl ammonium substituted alkyl or benzoyl oxybenzene sulfonates, N-acylated caprolactams, and monobenzoyltetraacetyl glucose benzoyl peroxides. Preferred cationic peroxyacid precursors of the N-acylated caprolactam class include the trialkyl ammonium methylene benzoyl caprolactams and the trialkyl ammonium methylene alkyl caprolactams. Benzoxazm organic peroxyacid precursors Also suitable are precursor compounds of the benzoxazin-type, as disclosed for example in EP-A-332,294 and EP-A-482,807, particularly those having the formula:

wherein R1 is H, alkyl, alkaryl, aryl, or arylalkyl.

Preformed organic peroxyacid The organic peroxyacid bleaching system may contain, in addition to, or as an alternative to, an organic peroxyacid bleach precursor compound, a preformed organic peroxyacid, typically at a level of from 1% to 15% by weight, more preferably from 1% to 10% by weight of the composition.

A preferred class of organic peroxyacid compounds are the amide substituted compounds of the following general formulae:

wherein R1 is an alkyl, aryl or alkaryl group with from 1 to 14 carbon atoms, R2 is an alkylene, arylene, and alkarylene group containing from 1 to 14 carbon atoms, and R5 is H or an alkyl, aryl, or alkaryl group containing 1 to 10 carbon atoms. Amide substituted organic peroxyacid compounds of this type are described in EP-A-0170386.

Other organic peroxyacids include diacyl and tetraacylperoxides, especially diperoxydodecanedioc acid, diperoxytetradecanedioc acid and diperoxyhexadecanedioc acid. Mono- and diperazelaic acid, mono- and diperbrassylic acid and Nphthaloylaminoperoxicaproic acid are also suitable herein.

Bleach catalyst The compositions optionally contain a transition metal containing bleach catalyst. One suitable type of bleach catalyst is a catalyst system comprising a heavy metal cation of defined bleach catalytic activity, such as copper, iron or manganese cations, an auxiliary metal cation having little or no bleach catalytic activity, such as zinc or aluminum cations, and a sequestrant having defined stability constants for the catalytic and auxiliary metal cations, particularly ethylenediaminetetraacetic acid, ethylenediaminetetra(methylenephosphonic acid) and water-soluble salts thereof. Such catalysts are disclosed in U.S. Pat. 4,430,243.

Other types of bleach catalysts include the manganese-based complexes disclosed in U.S.

Pat. 5,246,621 and U.S. Pat. 5,244,594. Preferred examples of these catalysts include MnIV2(u-O)3(1,4,7-trimethyl-1,4,7-triazacyclononane)2-(PF6)2, MnIII2(u-O)1(u OAc)2( 1 ,4,7-trirnethyl- 1 ,4,7-triazacyclononane)2-(ClO4)2, MnIV4(u-O)6(1,4,7- triazacyclononane)4-(ClO4)2, MntIIMnIV4(u-O) 1 (u-OAc)2 (1,4,7-trimethyl- 1,4,7triazacyclononane)2-(ClO4)3, and mixtures thereof. Others are described in European patent application publication no. 549,272. Other ligands suitable for use herein include 1,5 ,9-trimethyl- I ,5 ,9-triazacyclododecane, 2-methyl-i ,4,7-triazacyclononane, 2-methyl1 ,4,7-triazacyclononane, 1 ,2,4,7-tetramethyl-1 ,4,7-triazacyclononane, and mixtures thereof.

For examples of suitable bleach catalysts see U.S. Pat. 4,246,612 and U.S. Pat. 5,227,084.

See also U.S. Pat. 5,194,416 which teaches mononuclear manganese (IV) complexes such as Mn(l,4,7-trimethyl- 1 ,4,7-triazacyclononane)(OCH3)3 (PF6). Still another type of bleach catalyst, as disclosed in U.S. Pat. 5,114,606, is a water-soluble complex of manganese (III), and/or (IV) with a ligand which is a non-carboxylate polyhydroxy compound having at least three consecutive C-OH groups. Other examples include binuclear Mn complexed with tetra-N-dentate and bi-N-dentate ligands, including N4MnIII(u-0)2MnIVN4)+and [Bipy2MnIII(u-0)2MnVbipy2]-(C104)3.

Further suitable bleach catalysts are described, for example, in European patent application No. 408,131 (cobalt complex catalysts), European patent applications, publication nos. 384,503, and 306,089 (metallo-porphyrin catalysts), U.S. 4,728,455 (manganese/multidentate ligand catalyst), U.S. 4,711,748 and European patent application, publication no. 224,952, (absorbed manganese on aluminosilicate catalyst), U.S. 4,601,845 (aluminosilicate support with manganese and zinc or magnesium salt), U.S. 4,626,373 (manganese/ligand catalyst), U.S. 4,119,557 (ferric complex catalyst), German Pat. specification 2,054,019 (cobalt chelant catalyst) Canadian 866,191 (transition metal-containing salts), U.S. 4,430,243 (chelants with manganese cations and non-catalytic metal cations), and U.S. 4,728,455 (manganese gluconate catalysts).

Heaw metal ion sequestrant The detergent compositions of the invention preferably contain as an optional component a heavy metal ion sequestrant. By heavy metal ion sequestrant it is meant herein components which act to sequester (chelate) heavy metal ions. These components may also have calcium and magnesium chelation capacity, but preferentially they show selectivity to binding heavy metal ions such as iron, manganese and copper.

Heavy metal ion sequestrants are generally present at a level of from 0.005% to 20%, preferably from 0.1% to 10%, more preferably from 0.25% to 7.5% and most preferably from 0.5% to 5% by weight of the compositions.

Suitable heavy metal ion sequestrants for use herein include organic phosphonates, such as the amino alkylene poly (alkylene phosphonates), alkali metal ethane 1-hydroxy disphosphonates and nitrilo trimethylene phosphonates.

Preferred among the above species are diethylene triamine penta (methylene phosphonate), ethylene diamine tri (methylene phosphonate) hexamethylene diamine tetra (methylene phosphonate) and hydroxy-ethylene 1,1 diphosphonate.

Other suitable heavy metal ion sequestrant for use herein include nitrilotriacetic acid and polyaminocarboxylic acids such as ethylenediaminotetracetic acid, ethylenetriamine pentacetic acid, ethylenediamine disuccinic acid, ethylenediamine diglutaric acid, 2hydroxypropylenediamine disuccinic acid or any salts thereof. Especially preferred is ethylenediamine-N,N'-disuccinic acid (EDDS) or the alkali metal, alkaline earth metal, ammonium, or substituted ammonium salts thereof, or mixtures thereof.

Other suitable heavy metal ion sequestrants for use herein are iminodiacetic acid derivatives such as 2-hydroxyethyl diacetic acid or glyceryl imino diacetic acid, described in EP-A-317,542 and EP-A-399,133. The iminodiacetic acid-N-2-hydroxypropyl sulfonic acid and aspartic acid N-carboxymethyl N-2-hydroxypropyl-3-sulfonic acid sequestrants described in EP-A-516,102 are also suitable herein. The -alanine-N,N'-diacetic acid, aspartic acid-N,N'-diacetic acid, aspartic acid-N-monoacetic acid and iminodisuccinic acid sequestrants described in EP-A-509,382 are also suitable.

EP-A476,257 describes suitable amino based sequestrants. EP-A-510,331 describes suitable sequestrants derived from collagen, keratin or casein. EP-A-528,859 describes a suitable alkyl iminodiacetic acid sequestrant. Dipicolinic acid and 2-phosphonobutane 1,2,4-tricarboxylic acid are alos suitable. Glycinamide-N,N'-disuccinic acid (GADS), ethylenediamine-N-N'-diglutaric acid (EDDG) and 2-hydroxypropylenediamine-N-N'disuccinic acid (HPDDS) are also suitable.

Enzyme Another preferred ingredient useful in the detergent compositions is one or more additional enzymes.

Preferred additional enzymatic materials include the commercially available lipases, cutinases, amylases, neutral and alkaline proteases, esterases, cellulases, pectinases, lactases and peroxidases conventionally incorporated into detergent compositions.

Suitable enzymes are discussed in US Patents 3,519,570 and 3,533,139.

Preferred commercially available protease enzymes include those sold under the tradenames Alcalase, Savinase, Primase, Durazym, and Esperase by Novo Industries A/S (Denmark), those sold under the tradename Maxatase, Maxacal and Maxapem by Gist Brocades, those sold by Genencor International, and those sold under the tradename Opticlean and Optimase by Solvay Enzymes. Protease enzyme may be incorporated into the compositions in accordance with the invention at a level of from 0.0001% to 4% active enzyme by weight of the composition.

Preferred amylases include, for example, amylases obtained from a special strain of B licheniformis, described in more detail in GB-1,269,839 (Novo). Preferred commercially available amylases include for example, those sold under the tradename Rapidase by Gist-Brocades, and those sold under the tradename Termamyl and BAN by Novo Industries A/S. Amylase enzyme may be incorporated into the composition in accordance with the invention at a level of from 0.0001% to 2% active enzyme by weight of the composition.

Lipolytic enzyme may be present at levels of active lipolytic enzyme of from 0.0001% to 2% by weight, preferably 0.001% to 1% by weight, most preferably from 0.001% to 0.5% by weight of the compositions.

The lipase may be fungal or bacterial in origin being obtained, for example, from a lipase producing strain of Humicola sp., Thermomyces sp. or Pseudomonas sp. including Pseudomonas pseudoalcaligenes or Pseudomas fluorescens. Lipase from chemically or genetically modified mutants of these strains are also useful herein. A preferred lipase is derived from Pseudomonas pseudoalcaligenes, which is described in Granted European Patent, EP-B-0218272.

Another preferred lipase herein is obtained by cloning the gene from Humicola lanuginosa and expressing the gene in Aspergillus QrYza, as host, as described in European Patent Application, EP-A-0258 068, which is commercially available from Novo Industri A/S, Bagsvaerd, Denmark, under the trade name Lipolase. This lipase is also described in U.S. Patent 4,810,414, Huge-Jensen et al, issued March 7, 1989.

Organic polymeric compound Organic polymeric compounds are preferred additional components of the detergent compositions in accord with the invention, and are preferably present as components of any particulate components where they may act such as to bind the particulate component together. By organic polymeric compound it is meant herein essentially any polymeric organic compound commonly used as dispersants, and anti-redeposition and soil suspension agents in detergent compositions, including any of the high molecular weight organic polymeric compounds described as clay flocculating agents herein.

Organic polymeric compound is typically incorporated in the detergent compositions of the invention at a level of from 0.1% to 30%, preferably from 0.5% to 15%, most preferably from 1% to 10% by weight of the compositions.

Examples of organic polymeric compounds include the water soluble organic homo- or co-polymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxyl radicals separated from each other by not more than two carbon atoms. Polymers of the latter type are disclosed in GB-A-1,596,756. Examples of such salts are polyacrylates of MWt 2000-5000 and their copolymers with maleic anhydride, such copolymers having a molecular weight of from 20,000 to 100,000, especially 40,000 to 80,000.

The polyamino compounds are useful herein including those derived from aspartic acid such as those disclosed in EP-A-305282, EP-A-305283 and EP-A-351629.

Terpolymers containing monomer units selected from maleic acid, acrylic acid, polyaspartic acid and vinyl alcohol, particularly those having an average molecular weight of from 5,000 to 10,000, are also suitable herein.

Other organic polymeric compounds suitable for incorporation in the detergent compositions herein include cellulose derivatives such as methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose and hydroxyethylcellulose.

Further useful organic polymeric compounds are the polyethylene glycols, particularly those of molecular weight 1000-10000, more particularly 2000 to 8000 and most preferably about 4000.

Suds suppressing system The detergent compositions of the invention, when formulated for use in machine washing compositions, preferably comprise a suds suppressing system present at a level of from 0.01% to 15%, preferably from 0.05% to 10%, most preferably from 0.1% to 5% by weight of the composition.

Suitable suds suppressing systems for use herein may comprise essentially any known antifoam compound, including, for example silicone antifoam compounds and 2-alkyl alcanol antifoam compounds.

By antifoam compound it is meant herein any compound or mixtures of compounds which act such as to depress the foaming or sudsing produced by a solution of a detergent composition, particularly in the presence of agitation of that solution.

Particularly preferred antifoam compounds for use herein are silicone antifoam compounds defined herein as any antifoam compound including a silicone component.

Such silicone antifoam compounds also typically contain a silica component. The term "silicone" as used herein, and in general throughout the industry, encompasses a variety of relatively high molecular weight polymers containing siloxane units and hydrocarbyl group of various types. Preferred silicone antifoam compounds are the siloxanes, particularly the polydimethylsiloxanes having trimethylsilyl end blocking units.

Other suitable antifoam compounds include the monocarboxylic fatty carbon atoms, propylene oxide, bis stearic acid amide and monostearyl di-alkali metal (e.g. sodium, potassium, lithium) phosphates and phosphate esters.

A preferred suds suppressing system comprises (a) antifoam compound, preferably silicone antifoam compound, most preferably a silicone antifoam compound comprising in combination (i) polydimethyl siloxane, at a level of from 50% to 99%, preferably 75% to 95% by weight of the silicone antifoam compound; and (ii) silica, at a level of from 1% to 50%, preferably 5% to 25% by weight of the silicone/silica antifoam compound; wherein said silica/silicone antifoam compound is incorporated at a level of from 5% to 50%, preferably 10% to 40% by weight; (b) a dispersant compound, most preferably comprising a silicone glycol rake copolymer with a polyoxyalkylene content of 72-78% and an ethylene oxide to propylene oxide ratio of from 1:0.9 to 1:1.1, at a level of from 0.5% to 10%, preferably 1% to 10% by weight; a particularly preferred silicone glycol rake copolymer of this type is DCO544, commercially available from DOW Corning under the tradename DCO544; (c) an inert carrier fluid compound, most preferably comprising a C1 6-C18 ethoxylated alcohol with a degree of ethoxylation of from 5 to 50, preferably 8 to 15, at a level of from 5% to 80%, preferably 10% to 70%, by weight; A highly preferred particulate suds suppressing system is described in EP-A-0210731 and comprises a silicone antifoam compound and an organic carrier material having a melting point in the range 50"C to 85"C, wherein the organic carrier material comprises a monoester of glycerol and a fatty acid having a carbon chain containing from 12 to 20 carbon atoms. EP-A-0210721 discloses other preferred particulate suds suppressing systems wherein the organic carrier material is a fatty acid or alcohol having a carbon chain containing from 12 to 20 carbon atoms, or a mixture thereof, with a melting point of from 45"C to 800C.

Clay softening system The detergent compositions may contain a clay softening system comprising a clay mineral compound and optionally a clay flocculating agent.

The clay mineral compound is preferably a smectite clay compound. Smectite clays are disclosed in the US Patents No.s 3,862,058, 3,948,790, 3,954,632 and 4,062,647.

European Patents No.s EP-A-299,575 and EP-A-313,146 in the name of the Procter and Gamble Company describe suitable organic polymeric clay flocculating agents.

Polymenc dye transfer inhibiting agents The detergent compositions herein may also comprise from 0.01% to 10 %, preferably from 0.05% to 0.5% by weight of polymeric dye transfer inhibiting agents.

The polymeric dye transfer inhibiting agents are preferably selected from polyamine Noxide polymers, copolymers of N-vinylpyrrolidone and N-vinylimidazole, polyvinylpyrrolidonepolymers or combinations thereof.

a) Polvamme N-oxide polymers Polyamine N-oxide polymers suitable for use herein contain units having the following structure formula:

wherein P is a polymerisable unit, and A is

-O-, -S-, -N-; xis O orl; R are aliphatic, ethoxylated aliphatics, aromatic, heterocyclic or alicyclic groups or any combination thereof whereto the nitrogen of the N-O group can be attached or wherein the nitrogen of the N-O group is part of these groups.

The N-O group can be represented by the following general structures:

wherein R1, R2, and R3 are aliphatic groups, aromatic, heterocyclic or alicyclic groups or combinations thereof, x or/and y or/and z is 0 or 1 and wherein the nitrogen of the N-O group can be attached or wherein the nitrogen of the N-O group forms part of these groups. The N-O group can be part of the polymerisable unit (P) or can be attached to the polymeric backbone or a combination of both.

Suitable polyamine N-oxides wherein the N-O group forms part of the polymerisable unit comprise polyamine N-oxides wherein R is selected from aliphatic, aromatic, alicyclic or heterocyclic groups. One class of said polyamine N-oxides comprises the group of polyamine N-oxides wherein the nitrogen of the N-O group forms part of the R-group.

Preferred polyamine N-oxides are those wherein R is a heterocyclic group such as pyrridine, pyrrole, imidazole, pyrrolidine, piperidine, quinoline, acridine and derivatives thereof.

Other suitable polyamine N-oxides are the polyamine oxides whereto the N-O group is attached to the polymerisable unit. A preferred class of these polyamine N-oxides comprises the polyamine N-oxides having the general formula (I) wherein R is an aromatic,heterocyclic or alicyclic groups wherein the nitrogen of the N-O functional group is part of said R group. Examples of these classes are polyamine oxides wherein R is a heterocyclic compound such as pyrridine, pyrrole, imidazole and derivatives thereof.

The polyamine N-oxides can be obtained in almost any degree of polymerisation. The degree of polymerisation is not critical provided the material has the desired watersolubility and dye-suspending power. Typically, the average molecular weight is within the range of 500 to 1000,000.

b) Copolymers of N-vinylpyrrolidone and N-vinylimidazole Suitable herein are coploymers of N-vinylimidazole and N-vinylpyrrolidone having an average molecular weight range of from 5,000 to 50,000. The preferred copolymers have a molar ratio of N-vinylimidazole to N-vinylpyrrolidone from 1 to 0.2.

c) Polyvinylpyrrolidone The detergent compositions herein may also utilize polyvinylpyrrolidone ("PVP") having an average molecular weight of from 2,500 to 400,000. Suitable polyvinylpyrrolidones are commercially vailable from ISP Corporation, New York, NY and Montreal, Canada under the product names PVP K-15 (viscosity molecular weight of 10,000), PVP K-30 (average molecular weight of 40,000), PVP K-60 (average molecular weight of 160,000), and PVP K-90 (average molecular weight of 360,000). PVP K-15 is also available from ISP Corporation. Other suitable polyvinylpyrrolidones which are commercially available from BASF Cooperation include Sokalan HP 165 and Sokalan HP 12.

d) Polyvinyloxazolidone The detergent compositions herein may also utilize polyvinyloxazolidones as polymeric dye transfer inhibiting agents. Said polyvinyloxazolidones have an average molecular weight of from 2,500 to 400,000.

e) Polyvinylimidazole The detergent compositions herein may also utilize polyvinylimidazole as polymeric dye transfer inhibiting agent. Said polyvinylimidazoles preferably have an average molecular weight of from 2,500 to 400,000.

Optical brightener The detergent compositions herein also optionally contain from about 0.005% to 5% by weight of certain types of hydrophilic optical brighteners.

Hydrophilic optical brighteners useful herein include those having the structural formula:

wherein R1 is selected from anilino, N-2-bis-hydroxyethyl and NH-2-hydroxyethyl; R2 is selected from N-2-bis-hydroxyethyl, N-2-hydroxyethyl-N-methylamino, morphilino, chloro and amino; and M is a salt-forming cation such as sodium or potassium.

When in the above formula, R1 is anilino, R2 is N-2-bis-hydroxyethyl and M is a cation such as sodium, the brightener is 4,4',-bis[(4-anilino-6-(N-2-bis-hydroxyethyl)-s-triazine- 2-yl)amino]-2,2'-stilbenedisulfonic acid and disodium salt. This particular brightener species is commercially marketed under the tradename Tinopal-UNPA-GX by Ciba Geigy Corporation. Tinopal-UNPA-GX is the preferred hydrophilic optical brightener useful in the detergent compositions herein.

When in the above formula, R1 is anilino, R2 is N-2-hydroxyethyl-N-2-methylamino and M is a cation such as sodium, the brightener is 4,4'-bis[(4-anilino-6-(N-2-hydroxyethyl N-methylamino)-s-triazine-2-yl)amino]2,2'-stilbenedisulfonic acid disodium salt. This particular brightener species is commercially marketed under the tradename Tinopal SBM-GX by Ciba-Geigy Corporation.

When in the above formula, R1 is anilino, R2 is morphilino and M is a cation such as sodium, the brightener is 4,4'-bis[(4-anilino-6-morphilino-s-triazine-2-yl)amino]2,2'- stilbenedisulfonic acid, sodium salt. This particular brightener species is commercially marketed under the tradename Tinopal AMS-GX by Ciba Geigy Corporation.

Catlome fabnc softening agents Cationic fabric softening agents can also be incorporated into compositions in accordance with the present invention. Suitable cationic fabric softening agents include the water insoluble tertiary amines or dilong chain amide materials as disclosed in GB-A-1 514276 and EP-B-0 011 340.

Cationic fabric softening agents are typically incorporated at total levels of from 0.5% to 15% by weight, normally from 1% to 5% by weight.

Other optional ingredients Other optional ingredients suitable for inclusion in the compositions of the invention include perfumes, colours and filler salts, with sodium sulfate being a preferred filler salt.

pH of the compositions The present compositions preferably have a pH measured as a 1 % solution in distilled water of at least 10.0, preferably from 10.0 to 12.5, most preferably from 10.5 to 12.0.

Form of the compositions The compositions in accordance with the invention can take a variety of physical forms including granular, tablet, and bar forms. The compositions are particularly the so-called concentrated granular detergent compositions adapted to be added to a washing machine by means of a dispensing device placed in the machine drum with the soiled fabric load.

The mean particle size of the base composition of granular compositions in accordance with the invention should preferably be such that no more that 5% of particles are greater than 1.7mm in diameter and not more than 5% of particles are less than 0.1 Smm in diameter.

The term mean particle size as defined herein is calculated by sieving a sample of the composition into a number of fractions (typically 5 fractions) on a series of Tyler sieves.

The weight fractions thereby obtained are plotted against the aperture size of the sieves.

The mean particle size is taken to be the aperture size through which 50% by weight of the sample would pass.

The bulk density of granular detergent compositions in accordance with the present invention typically have a bulk density of at least 600 g/litre, more preferably from 650 g/litre to 1200 g/litre.Bulk density is measured by means of a simple funnel and cup device consisting of a conical funnel moulded rigidly on a base and provided with a flap valve at its lower extremity to allow the contents of the funnel to be emptied into an axially aligned cylindrical cup disposed below the funnel. The funnel is 130 mm high and has internal diameters of 130 mm and 40 mm at its respective upper and lower extremities. It is mounted so that the lower extremity is 140 mm above the upper surface of the base. The cup has an overall height of 90 mm, an internal height of 87 mm and an internal diameter of 84 mm. Its nominal volume is 500 ml.

To carry out a measurement, the funnel is filled with powder by hand pouring, the flap valve is opened and powder allowed to overfill the cup. The filled cup is removed from the frame and excess powder removed from the cup by passing a straight edged implement eg; a knife, across its upper edge. The filled cup is then weighed and the value obtained for the weight of powder doubled to provide a bulk density in g/litre.

Replicate measurements are made as required.

The composition is preferably soluble in cold or cool water, i.e. the composition readily dissolves/disperses in water at a temperature between about 0 C and 32.20C, preferably between about 1 .60C and 10"C.

Surfactant agglomerate particles The surfactant system herein is preferably present in granular compositions in the form of surfactant agglomerate particles, which may take the form of flakes, prills, marumes, noodles, ribbons, but preferably take the form of granules. The most preferred way to process the particles is by agglomerating powders (e.g. aluminosilicate, carbonate) with high active surfactant pastes and to control the particle size of the resultant agglomerates within specified limits. Such a process involves mixing an effective amount of powder with a high active surfactant paste in one or more agglomerators such as a pan agglomerator, a Z-blade mixer or more preferably an in-line mixer such as those manufactured by Schugi (Holland) BV, 29 Chroomstraat 8211 AS, Lelystad, Netherlands, and Gebruder Lodige Maschinenbau GmbH, D-4790 Paderborn 1, Elsenerstrasse 7-9, Postfach 2050, Germany. Most preferably a high shear mixer is used, such as a Lodige CB (Trade Name).

In one embodiment, a high active surfactant paste comprising (i) typically from 50% by weight to 95% by weight, preferably 70% by weight to 85% by weight of surfactant and (ii) optionally the alkaline source is typically used. The paste may be pumped into the agglomerator at a temperature high enough to maintain a pumpable viscosity, but low enough to avoid degradation of the anionic surfactants used. An operating temperature of the paste of 50"C to 800C is typical. In another embodiment, the paste comprises the acid source.

In an especially preferred embodiment of the present invention, the detergent composition has a density of greater than about 600 g/l and is in the form of powder or a granulate containing more than about 5% by weight of the alkaline source, preferably (bi-) carbonate or percarbonate. The carbonate material is either dry-added or delivered via agglomerates.

In one embodiment, the citric acid is introduced by mixing it with the nonionic surfactant followed by spray-on. In another embodiment, the detergent surfactant is introduced by mixing it with nonionic surfactant followed by spray-on. Optional ingredients may also be applied by spraying them as a molten liquid on to solid components of the composition.

Laundry washing method Machine laundry methods herein typically comprise treating soiled laundry with an aqueous wash solution in a washing machine having dissolved or dispensed therein an effective amount of a machine laundry detergent composition in accord with the invention. By an effective amount of the detergent composition it is meant from 40g to 300g of product dissolved or dispersed in a wash solution of volume from 5 to 65 litres, as are typical product dosages and wash solution volumes commonly employed in conventional machine laundry methods.

In a preferred use aspect a dispensing device is employed in the washing method. The dispensing device is charged with the detergent product, and is used to introduce the product directly into the drum of the washing machine before the commencement of the wash cycle. Its volume capacity should be such as to be able to contain sufficient detergent product as would normally be used in the washing method.

Once the washing machine has been loaded with laundry the dispensing device containing the detergent product is placed inside the drum. At the commencement of the wash cycle of the washing machine water is introduced into the drum and the drum periodically rotates. The design of the dispensing device should be such that it permits containment of the dry detergent product but then allows release of this product during the wash cycle in response to its agitation as the drum rotates and also as a result of its contact with the wash water.

To allow for release of the detergent product during the wash the device may possess a number of openings through which the product may pass. Alternatively, the device may be made of a material which is permeable to liquid but impermeable to the solid product, which will allow release of dissolved product. Preferably, the detergent product will be rapidly released at the start of the wash cycle thereby providing transient localised high concentrations of product in the drum of the washing machine at this stage of the wash cycle.

Preferred dispensing devices are reusable and are designed in such a way that container integrity is maintained in both the dry state and during the wash cycle. Especially preferred dispensing devices for use with the composition of the invention have been described in the following patents; GB-B-2, 157, 717, GB-B-2, 157, 718, EP-A-0201376, EP-A-0288345 and EP-A-0288346. An article by J.Bland published in Manufacturing Chemist, November 1989, pages 4146 also describes especially preferred dispensing devices for use with granular laundry products which are of a type commonly know as the "granulette". Another preferred dispensing device for use with the compositions of this invention is disclosed in PCT Patent Application No. WO94/11562.

Especially preferred dispensing devices are disclosed in European Patent Application Publication Nos. 0343069 & 0343070. The latter Application discloses a device comprising a flexible sheath in the form of a bag extending from a support ring defining an orifice, the orifice being adapted to admit to the bag sufficient product for one washing cycle in a washing process. A portion of the washing medium flows through the orifice into the bag, dissolves the product, and the solution then passes outwardly through the orifice into the washing medium. The support ring is provided with a masking arrangemnt to prevent egress of wetted, undissolved, product, this arrangement typically comprising radially extending walls extending from a central boss in a spoked wheel configuration, or a similar structure in which the walls have a helical form.

Alternatively, the dispensing device may be a flexible container, such as a bag or pouch.

The bag may be of fibrous construction coated with a water impermeable protective material so as to retain the contents, such as is disclosed in European published Patent Application No. 0018678. Alternatively it may be formed of a water-insoluble synthetic polymeric material provided with an edge seal or closure designed to rupture in aqueous media as disclosed in European published Patent Application Nos. 0011500, 0011501, 0011502, and 0011968. A convenient form of water frangible closure comprises a water soluble adhesive disposed along and sealing one edge of a pouch formed of a water impermeable polymeric film such as polyethylene or polypropylene.

Packaging for the compositions Commercially marketed executions of the bleaching compositions can be packaged in any suitable container including those constructed from paper, cardboard, plastic materials and any suitable laminates. A preferred packaging execution is described in European Application No. 94921505.7.

Abbreviations used in following Examples In the detergent compositions, the abbreviated component identifications have the following meanings: LAS Sodium linear C12 alkyl benzene sulfonate TAS Sodium tallow alkyl sulfate C45AS Sodium C1 4-C15 linear alkyl sulfate CxyEzS Sodium C1x-Cly branched alkyl sulfate condensed with z moles of ethylene oxide C45E7 A C14-15 predominantly linear primary alcohol condensed with an average of 7 moles of ethylene oxide C25E3 A C12-15 branched primary alcohol condensed with an average of 3 moles of ethylene oxide C25E5 A C12-15 branched primary alcohol condensed with an average of 5 moles of ethylene oxide CEQ R1COOCH2CH2.N+(CH3)3 with R1 = C1 1-C13 QAS R2.N+(CH3)2(C2H4OH) with R2 = C12- C14 Soap Sodium linear alkyl carboxylate derived from an 80/20 mixture of tallow and coconut oils.

TFAA C 16-C18 8 alkyl N-methyl glucamide TPKFA C12-C14 topped whole cut fatty acids STPP Anhydrous sodium tripolyphosphate Zeolite A Hydrated Sodium Aluminosilicate of formula Na12(Al02SiO2)12. 27H20 having a primary particle size in the range from 0.1 to 10 micrometers NaSKS-6 Crystalline layered silicate of formula 8 -Na2Si205 Citric acid Anhydrous citric acid Carbonate Anhydrous sodium carbonate with a particle size between 200 pm and 900pm Bicarbonate Anhydrous sodium bicarbonate with a particle size distribution between 400pm and 1200pm Silicate Amorphous Sodium Silicate (SiO2:Na2O; 2.0 ratio) Sodium sulfate Anhydrous sodium sulfate Citrate Tri-sodium citrate dihydrate of activity 86.4% with a particle size distribution between 425pm and 850m MA/AA Copolymer of 1:4 maleic/acrylic acid, average molecular weight about 70,000.

CMC Sodium carboxymethyl cellulose Protease Proteolytic enzyme of activity 4KNPU/g sold by NOVO Industries A/S under the tradename Savinase Alcalase Proteolytic enzyme of activity 3AU/g sold by NOVO Industries A/S Cellulase Cellulytic enzyme of activity 1000 CEVU/g sold by NOVO Industries A/S under the tradename Carezyme Amylase Amylolytic enzyme of activity 60KNU/g sold by NOVO Industries A/S under the tradename Termamyl 60T Lipase Lipolytic enzyme of activity 100kLU/g sold by NOVO Industries A/S under the tradename Lipolase Endolase Endoglunase enzyme of activity 3000 CEVU/g sold by NOVO Industries A/S PB4 Sodium perborate tetrahydrate of nominal formula NaBO2.3H2O.H2O2 PB 1 Anhydrous sodium perborate monohydrate bleach of nominal formula NaBo2.H2o2 Percarbonate Sodium Percarbonate of nominal formula 2Na2C03.3H202 NOBS Nonanoyloxybenzene sulfonate in the form of the sodium salt.

*TAED Tetraacetylethylenediamine DTPMP: Diethylene triamine penta (methylene phosphonate), marketed by Monsanto under the Trade name Dequest 2060 Photoactivated Sulfonated Zinc Phthlocyanine encapsulated in bleach dextrin soluble polymer Brightener 1 Disodium 4,4'-bis(2-sulphostyryl)biphenyl Brightener 2 Disodium 4,4'-bis(4-anilino-6-morpholino-1.3.5- triazin-2-yl)amino) stilbene-2 :2'-disulfonate.

HEDP 1,1 -hydroxyethane diphosphonic acid PVNO Polyvinylpyridine N-oxide PVPVI Copolymer of polyvinylpyrolidone and vinylimidazole SRP 1 Sulfobenzoyl end capped esters with oxyethylene oxy and terephtaloyl backbone SRP 2 Diethoxylated poly (1, 2 propylene terephtalate) short block polymer Silicone antifoam: Polydimethylsiloxane foam controller with siloxane-oxyalkylene copolymer as dispersing agent with a ratio of said foam controller to said dispersing agent of 10:1 to 100:1.

Alkalinity % weight equivalent of NaOH, as obtained using the alkalinity release test method described herein.

In the following Examples all levels are quoted as % by weight of the composition: Example 1 The following detergent formulations, according to the present invention were prepare where A is a phosphorus-containing detergent composition, B is a zeolite-containing detergent composition and C is a compact detergent composition:

A B C Blown Powder STPP 14.0 14.0 Zeolite A - 20.0 C45AS 9.0 6.0 8.0 MA/AA 2.0 4.0 2.0 LAS 6.0 8.0 9.0 TAS 2.0 CEQ 1.5 3.0 3.5 Silicate 7.0 8.0 8.0 CMC 1.0 1.0 0.5 Brightener 2 0.2 0.2 0.2 Soap 1.0 1.0 1.0 DTPMP 0.4 0.4 0.2 Spray On Citric acid 2.5 2.0 5.0 C45E7 2.5 2.5 2.0 C25E3 2.5 2.5 2.0 Silicone antifoam 0.3 0.3 0.3

Perfume 0.3 0.3 0.3 Dry additives Carbonate 26.0 23.0 25.0 PB4 18.0 18.0 10 PUB 1 4.0 4.0 0 TAED 3.0 3.0 1.0 Photoactivated bleach 0.02 0.02 0.02 Protease 1.0 1.0 1.0 Lipase 0.4 0.4 0.4 Amylase 0.25 0.30 0.15 Dry mixed sodium sulfate 3.0 3.0 5.0 Balance (Moisture & 100.0 100.0 100.0 Miscellaneous) Density (litre) 630 670 670 Example 2 The following nil bleach-containing detergent formulations of particular use in the washing of colored clothing, according to the present invention were prepared:

D E Blown Powder Zeolite A 15.0 Sodium sulfate LAS 3.0 CEQ 2.0 1.3 DTPMP 0.4 CMC 0.4 MA/AA 4.0 Agglomerates C45AS - 11.0 LAS 6.0 TAS 3.0 Silicate 4.0 Zeolite A 10.0 13.0 CMC - 0.5 MA/AA - 2.0 Carbonate 9.0 7.0 Spray On Citric acid 4.0 3.0 Perfiune 0.3 0.5 C45E7 4.0 4.0 C25E3 2.0 2.0 Dry additives

MA/AA - 3.0 NaSKS-6 - 12.0 Citrate 10.0 8.0 Bicarbonate 7.0 5.0 Carbonate 8.0 7.0 PVPVI/PVNO 0.5 0.5 Alcalase 0.5 0.9 Lipase 0.4 0.4 Amylase 0.6 0.6 Cellulase 0.6 0.6 Silicone antifoam 5.0 5.0 Dry additives Sodium sulfate 0.0 0.0 Balance (Moisture and Miscellaneous) 100.0 100.0 Density (g/litre) 700 700 Example3 The following detergent formulations, according to the present invention were prepared:

E F G Blown Powder Zeolite A 10.0 15.0 6.0 Sodium sulfate 19.0 5.0 7.0 MA/AA 3.0 3.0 6.0 LAS 10.0 8.0 10.0 C45AS 4.0 5.0 7.0 CEQ 2.0 2.0 2.0

Silicate - 1.0 7.0 Soap - - 2.0 Brightener 1 0.2 0.2 0.2 Carbonate 28.0 26.0 20.0 DTPMP - 0.4 0.4 Spray On Citric acid 2.5 2.5 2.0 C45E7 1.0 1.0 1.0 Dry additives PVPVI/PVNO 0.5 0.5 0.5 Protease 1.0 1.0 1.0 Lipase 0.4 0.4 0.4 Amylase 0.1 0.1 0.1 Cellulase 0.1 0.1 0.1 NOBS - 6.1 4.5 PB1 1.0 5.0 6.0 Sodium sulfate - 6.0 < Example4 The following high density and bleach-containing detergent formulations, according to the present invention were prepared:

H I Blown Powder Zeolite A 15.0 15.0 Sodim sulfate 0.0 0.0 LAS 3.0 3.0 QAS - 1.5 CEQ 2.0 2.0 DTPMP 0.4 0.4 CMC 0.4 0.4 MA/AA 4.0 2.0 Agglomerates LAS 4.0 4.0 TAS 2.0 1.0 Silicate 3.0 4.0 Zeolite A 8.0 8.0 Carbonate 8.0 6.0 Spray On Citric acid 2.0 3.0 Perfume 0.3 0.3 C45E7 2.0 2.0 C25E3 2.0 Dry additives Citrate 5.0 2.0

Bicarbonate Carbonate 8.0 | 10.0 TAED 6.0 @ 5.0 PB1 z 14.0 10.0 Polyethylene oxide of MW 5,000,000 1 0.2 Bentoniteclay 10.0 Protease 1.0 1.0 Lipase 0.4 0.4 Amylase 0.6 @ 0.6 Cellulase 0.6 @ 0.6 Silicone antifoam 5.0 5.0 Dry additives Sodium sulfate 0.0 | 0.0 Balance (Moisture and 100.0 100.0 Miscellaneous) Density (g/litre) 850 850 Examples The following high density detergent formulations, according to the present invention were prepared:

J K Agglomerate C45AS 11.0 14.0 CEQ @ 3.0 1 3.5

ZeoliteA 15.0 6.0 Carbonate 4.0 8.0 MA/AA 4.0 2.0 CMC 0.5 0.5 DTPMP 0.4 0.4 Spray On Citric acid 1.5 2.0 C25E5 5.0 5.0 Perfume 0.5 0.5 Dry Adds HEDP 0.5 0.3 SKS 6 13.0 10.0 Citrate 3.0 1.0 TAED 5.0 7.0 Percarbonate 20.0 20.0 SRP 1 0.3 0.3 Protease 1.4 1.4 Lipase 0.4 0.4 Cellulase 0.6 0.6 Amylase 0.6 0.6 Silicone antifoam 5.0 5.0 Brightener 1 0.2 0.2 Brightener 2 0.2 Balance (Moisture and 100 100 Miscellaneous) Density (g/litre) 850 850

Claims (37)

1. Claims 1. A process for making a detergent composition comprising: i) making a detergent base composition comprising a solid detergent surfactant and an alkaline source; and ii) coating at least the solid detergent surfactant with an acid source; and wherein the alkaline source and the acid source are capable of reacting together to produce a gas.
2. 2. A process according to claim 1 further comprising mixing the acid source with a nonionic surfactant prior to the acid coating step (ii).
3. 3. A process according to claim 1 further comprising coating at least the solid detergent surfactant with a nonionic surfactant prior to the acid coating step (ii).
4. 4. A process according to any preceding claim wherein the acid source and/or nonionic surfactant are sprayed on to at least the solid detergent surfactant.
5. 5. A process according to any preceding claim wherein the alkaline source is agglomerated with the detergent surfactant of the base composition.
6. 6. A process according to any one of claims 1 to 4 wherein the alkaline source is added to the base composition as a separate component.
7. 7. A process according to any preceding claim wherein the acid source comprises up to about 95% by weight of the coating.
8. 8. A process for making a detergent composition comprising: i) making a detergent base composition comprising a solid acid source; ii) coating the solid acid source with a detergent surfactant; and iii) further adding an alkaline source; and wherein the alkaline source and the acid source are capable of reacting together to produce a gas.
9. 9. A process according to claim 8 wherein the detergent surfactant is not a nonionic surfactant, and a nonionic surfactant is mixed with the acid source and/or detergent surfactant prior to the coating step (ii).
10. 10. A process according to claim 8 wherein the detergent surfactant and/or alkalinity source are sprayed on to the solid acid source.
11. 11. A process according to claim 8 wherein the alkaline source is agglomerated with the acid source of the base composition.
12. 12. A process according to claim 8 wherein the alkaline source is added as a separate component.
13. 13. A process according to any preceding claim wherein the alkaline source comprises a alkaline salt selected from an alkali metal or alkaline earth metal carbonate, bicarbonate, sesqui-carbonate or alkali metal percarbonate salt.
14. 14. A process according to any preceding claim wherein the acid source comprises an organic, mineral or inorganic acid.
15. 15. A process according to claim 14 wherein the acid source is citric acid, glutaric acid, succinic acid, adipic acid, monosodium phosphate, sodium hydrogen sulfate or boric acid.
16. 16. A detergent composition prepared by the process of any preceding claim.
17. 17. A detergent composition comprising a base composition comprising a solid detergent surfactant and an alkaline source, wherein at least the solid detergent surfactant is coated with an acid source.
18. 18. A detergent composition according to claim 17 wherein at least the solid detergent surfactant is coated with the acid source and a nonionic surfactant.
19. 19. A detergent composition according to claim 17 further comprising a nonionic surfactant layer between the solid detergent surfactant and the acid source coating.
20. 20. A detergent composition comprising a base composition comprising a solid acid source and an alkaline source, and at least the solid acid source is coated with a detergent surfactant.
21. 21. A detergent composition according to claim 20 wherein when the detergent surfactant is not a nonionic surfactant, the solid acid source is coated with a detergent surfactant and nonionic surfactant.
22. 22. A detergent composition according to claim 20 or 21 further comprising a nonionic surfactant layer between the acid source and the detergent surfactant.
23. 23. A detergent composition comprising a particulate base composition having a core which comprises a solid detergent surfactant and an alkaline source, and an outer layer comprising an acid source.
24. 24. A detergent composition according to claim 23 wherein the outer layer further comprises a nonionic surfactant.
25. 25. A detergent composition according to claim 23 further comprising a nonionic surfactant layer between the solid detergent surfactant and the acid source layer.
26. 26. A detergent composition comprising a particulate base composition comprising an alkaline source and having a core which comprises a solid acid source, and an outer layer comprising a detergent surfactant.
27. 27. A detergent composition according to claim 26 wherein the detergent surfactant is not a nonionic surfactant, and the outer layer further comprises a nonionic surfactant.
28. 28. A detergent composition according to claim 26 wherein the detergent surfactant is not a nonionic surfactant, and further comprising a nonionic surfactant layer between the solid detergent surfactant and the acid source layer.
29. 29. A detergent composition according to any one of claims 16 to 28 wherein the alkaline source is added to the base composition as a separate component.
30. 30. A detergent composition according to any one of claims 16 to 28 wherein the acid source, alkaline source and detergent surfactant are in separate layers.
31. 31. A detergent composition having multiple discrete layers and comprising at least one layer of an acid source, and at least one layer of a detergent surfactant and/or alkaline source.
32. 32. A detergent composition according to claim 31 wherein the detergent surfactant and alkaline source are in the same layer.
33. 33. A detergent composition according to claim 31 wherein the detergent surfactant and alkaline source are in different layers.
34. 34. A detergent composition according to any one of claims 16 to 33 wherein the alkaline source comprises a alkaline salt selected from an alkali metal or alkaline earth metal carbonate, bicarbonate, sesqui-carbonate or alkali metal percarbonate salt.
35. 35. A detergent composition according to any one of claims 16 to 34 wherein the acid source comprises an organic, mineral or inorganic acid.
36. 36. A detergent composition according to claim 35 wherein the acid source is citric acid, glutaric acid, succinic acid, adipic acid, monosodium phosphate, sodium hydrogen sulfate or boric acid.
37. 37. A method of washing laundry in a domestic washing machine comprising, introducing into a dispensing device which is placed in the drum of the washing machine, or introducing into the dispensing drawer of a washing machine, an effective amount of a detergent composition of any one of claims 16 to 36.