EP2688995B1 - Method of cleaning laundry - Google Patents

Method of cleaning laundry Download PDF

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Publication number
EP2688995B1
EP2688995B1 EP12708849.0A EP12708849A EP2688995B1 EP 2688995 B1 EP2688995 B1 EP 2688995B1 EP 12708849 A EP12708849 A EP 12708849A EP 2688995 B1 EP2688995 B1 EP 2688995B1
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Prior art keywords
surfactant
weight
treatment composition
alkyl
hydroxamate
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German (de)
English (en)
French (fr)
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EP2688995A1 (en
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Ian Howell
Anthony Mckee
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Unilever PLC
Unilever NV
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Unilever PLC
Unilever NV
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Priority to PL12708849T priority patent/PL2688995T3/pl
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/38—Cationic compounds
    • C11D1/52—Carboxylic amides, alkylolamides or imides or their condensation products with alkylene oxides
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/86—Mixtures of anionic, cationic, and non-ionic compounds

Definitions

  • the present invention relates to the use of hydroxamic acid and its corresponding salts in laundry detergent compositions with low levels of zeolite and phosphate builder, leading to improved detergency and stain removal.
  • Improvement of stain removal is one of the constant goals of the detergent industry, as this may lead to savings on the use of chemicals in detergent compositions, or may lead to washing at lower temperatures, and/or for shorter times, and therewith saving energy. Therefore, there is still an interest to improve the detergency effect, especially the primary detergency effect of laundry detergent compositions on textile stains, for example particulate stains, such as stains comprising soils or clay, or plant based stains, such as grass. Especially particulate stains are difficult to remove during the laundering process.
  • Hydroxamic acids are a class of chemical compounds in which a hydroxylamine is inserted into a carboxylic acid.
  • the general structure of a hydroxamic acid is the following: in which R 1 is an organic residue, for example alkyl or alkylene groups.
  • the hydroxamic acid may be present as its corresponding alkali metal salt, or hydroxamate.
  • hydroxamates may conveniently be formed from the corresponding hydroxamic acid by substitution of the acid hydrogen atom by a cation:
  • L + is a monovalent cation such as for example the alkali metals (e.g. potassium, sodium), or ammonium or a substituted ammonium.
  • Hydroxamic acids and hydroxamates are known to be useful as metal chelators. They have also been used in detergent compositions in order to improve bleaching performance, as well as use as a builder substance.
  • EP 388 389 A2 discloses bleach free under built liquid detergent compositions containing hydroxamic acids and their derivatives which assist in the removal of bleachable wine stains from fabrics during laundering.
  • Hydroxamic acids as in formula 1 are disclosed, wherein R 1 represents an optionally substituted straight- or branched chain C 5 -C 21 alkyl or C 5 -C 21 alkenyl group or an optionally-substituted phenyl group, and R 2 represents hydrogen, or an optionally substituted C 1 -C 6 alkyl group, or an optionally-substituted phenyl group.
  • One of the examples shows an improved bleaching performance when a hydroxamate is used in a detergent composition in hard water (20° German hardness, which is about 143 milligram calcium per litre).
  • the examples use C 12 linear, C 12 branched, C 13 branched and C 18 hydroxamates in detergent formulations comprising mixtures of anionic surfactant and nonionic surfactant.
  • examples I, II and IV there is an excess of nonionic surfactant of at least 1.25 to 1 and in example III there is 100% anionic surfactant.
  • the liquids also contain at least 6 wt% ethanol, which assists in solubilising the long chain hydroxamates
  • EP 384 912 A2 discloses the use of hydroxamic acids and their derivatives as stabilizers for peroxygen bleach compounds in built, mainly granular, detergent compositions. Fully formulated detergent powder examples with 20 wt% zeolite used C 12 , C 13 and C 12 branched hydroxamates. C 18 was also used.
  • US 4,874,539 discloses polymeric carboxy hydroxamic acids useful as detergent additives, especially as metal ion chelating agents, and also leading to improved tea stain removal from a test cloth, as compared to a detergent powder without a metal ion chelating agent.
  • US 4,863,636 discloses liquid detergent compositions comprising one or more detersive surfactants and one or more of N-hydroxyimide or carboxy hydroxamic acid detergent additives. These compounds serve as active metal ion chelants, leading to improved stain removal.
  • WO 97/48786 discloses a multicomponent system for use with detergent substances, containing an oxidation catalyst, a suitable oxidant, at least one mediator that has been selected from the group of, among others, hydroxamic acids and hydroxamic acid derivatives, a co-mediator, and optionally a low quantity of at least one free amine of each inserted mediator. This system leads to improved bleach function of the detergent, and less consumption of a mediator.
  • GB 1317445 discloses detergent compositions comprising an alkali-metal salt of a hydroxamic acid. The function of this salt is to prevent the corrosion of copper and copper alloys that is utilised in the construction of the washing machines.
  • Copending patent application WO 2010/069957 describes laundry detergent formulations comprising 0.5 to 20% by weight hydroxamic acid or its corresponding hydroxamate having a structure as specified therein. It is also shown in this document that the primary detergent effect, especially on red clay particulate soil, can be improved when applying these laundry detergent formulations for treating soiled fabric. It is known that this beneficial detergent effect cannot be obtained when using the hydroxamic acid or its corresponding hydroxamate in a fully built detergent in particular when the builder mainly contains zeolite and/or phosphate and/or carbonate builder. In this connection, it is an object of the present invention to provide an effective method for cleaning fabric wherein both a fully built detergent formulation and hydroxamic acid or its corresponding hydroxamate are used.
  • this object could be achieved by a method of cleaning fabric comprising a pretreating step followed by a main wash step whereby the hydroxamic acid is used in the pre-treatment step and the fully built detergent formulation, preferably a fully built detergent powder, is applied in the main wash step.
  • the present invention provides a method of cleaning laundry, wherein said method comprises the steps of:
  • references to a number of carbon atoms include mixed chain length materials provided that some of the hydroxamate material falls within the ranges specified and the ratios and amounts are determined by excluding any material falling outside of the specified range.
  • the pre-treatment composition may comprise from 1 to 15 wt% soap.
  • the preferred soaps are made from saturated fatty acids.
  • hydrotrope system comprising propylene glycol and glycerol at levels of at least 6 wt%, more preferably at least 10 wt%.
  • the preferred hydroxamates are those where R 2 is Hydrogen and R 1 is C 8 to C 14 alkyl, preferably normal alkyl, most preferably saturated.
  • Especially preferred pre-treatment compositions comprise at least 0.5 wt% of soil release polymer. This improves the multi wash performance of the detergent system for the removal of the clay. Inclusion of at least 0.5 wt% anti redeposition polymer is also beneficial due to the very high efficiency of primary detergency soil removal meaning that there is an increased level of soil in the wash liquor (particularly in step I of the method), which must then be prevented from redeposition onto the same or a different piece of fabric.
  • the preferred weight ratio of hydroxamate to detersive surfactant system for optimum particulate red clay soil removal lies in the range 1:10 to 1:100.
  • the pre-treatment composition used in the method of the invention comprises a surfactant system including nonionic and anionic surfactant whereby the level of anionic surfactant is 50 to 95 wt% based on the total weight of the surfactant system.
  • Said surfactant system can also suitably contain two different types of anionic surfactant of which the weight ratio lies in the range of 80:20 to 20:80.
  • a first type of anionic surfactant is preferably alkyl benzene sulphonate and the second type of anionic surfactant is preferably selected from the group consisting of alkyl ether sulphate, alkyl sulphate and alkyl carboxylate. More preferably, the second type of anionic surfactant is an alkyl ether sulphate.
  • the pre-treatment compositions used in the method of the invention are particularly suitable for use on particulate stains such as soils and clays, especially red clay, and also surprisingly grass. Therefore, in a second aspect, the present invention provides the use of a pre-treatment composition applied in the invention for the removal of particulate soils, preferably red clay, most preferably Georgia clay, from polyester and cotton fabrics.
  • the present invention provides the use of 0.005 to 20% by weight hydroxamic acid or its corresponding hydroxamate of the structure wherein R 1 is a C 8 -C 14 normal alkyl group, and R 2 is a hydrogen atom, in a laundry pre-treatment composition, for improving the particulate soils stain removal from a textile substrate, wherein the pre-treatment composition further comprises from 3 to 80 wt% of a detersive surfactant system; and optionally other ingredients to 100 wt% provided that zeolite, phosphate and carbonate builders are present at less than 5 wt%, and wherein the pre-treated fabrics are washed in a wash liquor comprising a main wash detergent formulation, preferably a main wash detergent powder, including surfactant and more than 15% by weight builder.
  • a laundry pre-treatment composition for improving the particulate soils stain removal from a textile substrate
  • the pre-treatment composition further comprises from 3 to 80 wt% of a detersive surfactant system; and optionally other
  • the stained fabric is treated with the liquid laundry pretreatment composition comprising hydroxamate according to the invention and the primary detergency is the measured stain removal by the laundry composition on the stain.
  • This is a separate process to so-called soil release using a polymer, which is treatment of fabric with a polymer (through a wash or other such treatment), with subsequent staining of the fabric, the soil release polymer having the effect of the easier removal of the stain.
  • R 1 is an alkyl ether group CH 3 (CH 2 ) n (EO) m wherein n is from 2 to 20 and m is from 1 to 12 then the alkyl moiety terminates this side group.
  • R 1 is chosen from the group consisting of C 4 , C 5 , C 6 , C 7 , C 8 , C 9 , C 10 , C 11 , or C 12 or C 14 normal alkyl group, most preferably R 1 is at least a C 8-14 normal alkyl group.
  • the C 8 material this is called octyl hydroxamic acid.
  • the potassium salt is particularly useful.
  • hydroxamic acids whilst less preferred, are suitable for use in the present invention.
  • suitable compounds include, but are not limited to, the following compounds:
  • Such hydroxamic acids are commercially available.
  • the hydroxamate acts by binding to metal ions that are present in the soil on the fabric. This binding action, which is, in effect, the known sequestrant property of the hydroxamate is not, in itself, of any use to remove the soil from the fabric.
  • the key is the "tail" of the hydroxamate i.e. the group R 1 minus any branching that folds back onto the amate Nitrogen via group R 2 .
  • the tail is selected to have an affinity for the surfactant system.
  • the soil removal ability of an already optimised surfactant system is further enhanced by the use of the hydroxamate as it, in effect, labels the difficult to remove particulate material (clay) as "soil” for removal by the surfactant system acting on the hydroxamate molecules now fixed to the particulates via their binding to the metal ions embedded in the clay type particulates.
  • the detersive surfactants will adhere to the hydroxamate, leading overall to more surfactants interacting with the fabric, leading to better soil release.
  • the hydroxamic acids act as a linker molecule facilitating the removal and suspension of the particulate soil from the fabric into a wash liquor and thus boosting the primary detergency.
  • This enhancing of the primary detergency of surfactant systems is especially relevant when using a concentrated liquid pretreatment detergent compositions having a relatively low pH (7.5-8) as compared to traditional laundering processes with particulate detergent compositions (pH 9-10.5).
  • the lower pH during the laundry pre-treatment process with liquid detergent compositions may lead to reduced soil release, as the surface charges of the soils are less negative as compared to the higher pH during the conventional well built and buffered laundering processes, achieved with conventional zeolite or phosphate built powder products.
  • This surface charge of the soil may lead to increased repellence of the surfactants by the soil, possibly leading to reduced release of the soil.
  • the hydroxamates are used in a liquid laundry pre-treatment composition, and more preferred the detersive surfactant concentration in said liquid pretreatment composition is from 20 to 80 wt%.
  • the hydroxamates have a higher affinity for transition metals, like iron, than for alkaline earth metals like calcium and magnesium, therefore the hydroxamic acid primarily acts to improve the removal of soil on fabric, especially particulate soils, and not additionally as a builder for calcium and magnesium. This selectively is especially beneficial if the laundering composition is underbuilt; especially when it comprises less than 5 wt% zeolite or phosphate builder.
  • the pre-treatment laundry detergent composition in which the hydroxamate is used comprises a detersive surfactant system at a concentration from 3 to 80 wt%.
  • a detersive surfactant system we mean that the surfactants therein provide a detersive, i.e. cleaning effect to textile fabrics treated as part of a laundering process.
  • Other surfactants which are not detersive surfactants, can be used as part of the composition.
  • the detersive surfactant is present at a level of from 5 to 60 wt%, more preferably from 10 to 50 wt%. Even more preferably, the detersive surfactant system comprises at least 20, or 30 or even 40 wt% of the composition.
  • any surfactant may be used as detersive surfactants, including anionic, nonionic, cationic, and amphoteric or zwitterionic surfactants, or combinations thereof.
  • nonionic and anionic surfactants of the surfactant system may -if present- be chosen from the surfactants described in 'Surface Active Agents' Vol. 1, by Schwartz & Perry, Interscience 1949 , Vol. 2 by Schwartz, Perry & Berch, Interscience 1958 , in the current edition of 'McCutcheon's Emulsifiers and Detergents' published by Manufacturing Confectioners Company or in 'Tenside-Taschenbuch', H. Stache, 2nd Edn., Carl Hauser Verlag, 1981 .
  • 'nonionic surfactant' shall be defined as amphiphilic molecules with a molecular weight of less than about 10,000, unless otherwise noted, which are substantially free of any functional groups that exhibit a net charge at the normal wash pH of 6-11.
  • nonionic surfactant may be used, although preferred materials are further discussed below.
  • fatty acid alkoxylates especially ethoxylates, having an alkyl chain of from C 8 -C 35 , preferably C 8 -C 30 , more preferably C 10 -C 24 , especially C 10 -C 18 carbon atoms, for example, the Neodol range from Shell (The Hague, The Netherlands); ethylene oxide/propylene oxide block polymers which may have molecular weight from 1,000 to 30,000, for example, Pluronic (trademark) from BASF (Ludwigshafen, Germany); and alkylphenol ethoxylates, for example Triton X-100, available from Dow Chemical (Midland, Mich., USA).
  • nonionic surfactants may also be considered. These include condensates of alkanolamines with fatty acids, such as cocamide DEA, polyol-fatty acid esters, such as the Span series available from Uniqema (Gouda, The Netherlands), ethoxylated polyol-fatty acid esters, such as the Tween series available from Uniqema (Gouda, The Netherlands), alkylpolyglucosides, such as the APG line available from Cognis (Düsseldorf, Germany) and n-alkylpyrrolidones, such as the Surfadone series of products marketed by ISP (Wayne, N.J., USA). Furthermore, nonionic surfactants not specifically mentioned above, but within the definition, may also be used.
  • the more preferred nonionic surfactants are the fatty acid ethoxylates with an average degree of ethoxylation of 7, alkoxylates with one propylene oxide and multiple ethylene oxide units, seed oil based surfactant, such as Ecosurf SA7 or SA9 available from Dow Chemical, APGs, and branched alcohol Guerbet nonionics.
  • 'Anionic surfactants' are defined herein as amphiphilic molecules comprising one or more functional groups that exhibit a net anionic charge when in aqueous solution at the normal wash pH of between 6 and 11.
  • Preferred anionic surfactants are the alkali metal salts of organic sulphur reaction products having in their molecular structure an alkyl radical containing from about 6 to 24 carbon atoms and a radical selected from the group consisting of sulphonic and sulphuric acid ester radicals.
  • anionic surfactant hereinafter described may be used, such as alkyl ether sulphates, soaps, fatty acid ester sulphonates, alkyl benzene sulphonates, sulphosuccinate esters, primary alkyl sulphates, olefin sulphonates, paraffin sulphonates and organic phosphate; preferred anionic surfactants are the alkali and alkaline earth metal salts of fatty acid carboxylates, fatty alcohol sulphates, preferably primary alkyl sulfates, more preferably they are ethoxylated, for example alkyl ether sulphates; alkylbenzene sulphonates, alkyl ester fatty acid sulphonates, especially methyl ester fatty acid sulphonates and mixtures thereof.
  • cationic, amphoteric surfactants and/or zwitterionic surfactants may be present in the liquid laundry pre-treatment compositions in which the hydroxamate is used as cosurfactant according to the invention.
  • Preferred cationic surfactants are quaternary ammonium salts of the general formula R 1 R 2 R 3 R 4 N + X - , for example where R 1 is a C 12 -C 14 alkyl group, R 2 and R 3 are methyl groups, R 4 is a 2-hydroxyethyl group, and X - is a chloride ion.
  • This material is available commercially as Praepagen (Trade Mark) HY from Clariant GmbH, in the form of a 40% by weight aqueous solution.
  • the liquid laundry pre-treatment composition in which the hydroxamate is used according to the invention further comprises an amphoteric or zwitterionic surfactant.
  • Amphoteric surfactants are molecules that contain both acidic and basic groups and will exist as zwitterions at the normal wash pH of between 6 and 11.
  • an amphoteric or zwitterionic surfactant is present at a level of from 0.1 to 20% by weight, more preferably from 0.25 to 15% by weight, even more preferably from 0.5 to 10% by weight.
  • Suitable zwitterionic surfactants are exemplified as those which can be broadly described as derivatives of aliphatic quaternary ammonium, sulfonium and phosphonium compounds with one long chain group having about 8 to about 18 carbon atoms and at least one water solubilizing radical selected from the group consisting of sulfate, sulfonate, carboxylate, phosphate or phosphonate.
  • a general formula for these compounds is: R 1 (R 2 )xY + R 3 Z -
  • R 1 contains an alkyl, alkenyl or hydroxyalkyl group with 8 to 18 carbon atoms, from 0 to 10 ethylene-oxy groups or from 0 to 2 glyceryl units;
  • Y is a nitrogen, sulphur or phosphorous atom;
  • R 2 is an alkyl or hydroxyalkyl group with 1 to 3 carbon atoms;
  • x is 1 when Y is a sulphur atom and 2 when Y is a nitrogen or phosphorous atom;
  • R 3 is an alkyl or hydroxyalkyl group with 1 to 5 carbon atoms and Z is radical selected from the group consisting of sulfate, sulfonate, carboxylate, phosphate or phosphonate.
  • Preferred amphoteric surfactants are amine oxides, for example coco dimethyl amine oxide.
  • the liquid laundry pretreatment compositions in which the hydroxamate is used preferably comprise low levels of detergency builder, based on the weight of the total composition.
  • the amounts of the inorganic builders zeolite and phosphate are less than 5 wt%.
  • the main wash detergent formulation used in step (II) of the method of the invention preferably comprises surfactant material and more than 15% by weight of builder.
  • Said main wash detergent is preferably a main wash detergent powder.
  • the builder used both in the pretreatment step (I) of the method of the invention is selected from the group of alkali and alkaline earth metal carbonates (e.g. sodium carbonate), silicates (e.g. layered silicate), and organic builders such as citrates (e.g. sodium citrate), succinates, sulphamates and malonates, and any combination of these.
  • alkali and alkaline earth metal carbonates e.g. sodium carbonate
  • silicates e.g. layered silicate
  • organic builders such as citrates (e.g. sodium citrate), succinates, sulphamates and malonates, and any combination of these.
  • the organic builders are preferred. They may be used at levels of 1 wt% or more, up to, say, 50 wt%.
  • Organic builders that may be present in the liquid pretreatment composition include polycarboxylate polymers such as polyacrylates and acrylic/maleic copolymers; polyaspartates; monomeric polycarboxylates such as citrates, gluconates, oxydisuccinates, glycerol mono-di- and trisuccinates, carboxymethyloxysuccinates, carboxy-methyloxymalonates, dipicolinates, hydroxyethyliminodiacetates, alkyl- and alkenylmalonates and succinates; and sulphonated fatty acid salts.
  • polycarboxylate polymers such as polyacrylates and acrylic/maleic copolymers
  • polyaspartates monomeric polycarboxylates such as citrates, gluconates, oxydisuccinates, glycerol mono-di- and trisuccinates, carboxymethyloxysuccinates, carboxy-methyloxymalonates, dipicolinates, hydroxyethylimin
  • Organic builders may be used in minor amounts. Especially preferred organic builders are citrates, suitably used in amounts of from 1 to 30 wt%, preferably from 1.5 to 10 wt%; and acrylic polymers, more especially acrylic/maleic copolymers, suitably used in amounts of from 0.5 to 15 wt%, preferably from 1 to 10 wt%.
  • Builders both inorganic and organic, are preferably present in alkali metal salt, especially sodium salt, form.
  • liquid pre-treatment formulation may include one or more optional ingredients to enhance performance and properties. While it is not necessary for these elements to be present in order to practice this invention, the use of such materials is often very helpful in rendering the formulation acceptable for consumer use.
  • optional components include, but are not limited to: hydrotropes, fluorescent whitening agents, photobleaches, fibre lubricants, reducing agents, enzymes, enzyme stabilising agents (such as borates and polyols), powder finishing agents, defoamers, bleaches, bleach catalysts, soil release agents, especially soil release polymers for cotton or polyester or both, antiredeposition agents, especially antiredeposition polymers, dye transfer inhibitors, buffers, colorants, fragrances, pro-fragrances, rheology modifiers, anti-ashing polymers, preservatives, insect repellents, soil repellents, water-resistance agents, suspending agents, aesthetic agents, structuring agents, sanitisers, solvents, including aqueous and non-aqueous solvents, fabric finishing agents, dye fixatives, wrinkle-reducing agents, fabric conditioning agents and deodorizers.
  • hydrotropes such as borates and polyols
  • powder finishing agents such as borates and polyols
  • defoamers
  • These optional ingredients may further include any one or more of the following: soap, peroxyacid and persalt bleaches, bleach activators, sequestrants, cellulose ethers and esters, other antiredeposition agents, sodium sulphate, sodium silicate, sodium chloride, calcium chloride, sodium bicarbonate, other inorganic salts, fluorescers, photobleaches, polyvinyl pyrrolidone, other dye transfer inhibiting polymers, foam controllers, foam boosters, acrylic and acrylic/maleic polymers, proteases, lipases, cellulases, amylases, other detergent enzymes, citric acid, soil release polymers, fabric conditioning compounds, coloured speckles, and perfume.
  • the main wash detergent formulation used in the 2 nd step of the method of the invention may also suitably contain one or more of the optional ingredients mentioned hereinabove.
  • the main wash laundry detergent formulation may suitably contain a bleach system based on peroxy bleach compounds, for example, inorganic persalts or organic peroxyacids, capable of yielding hydrogen peroxide in aqueous solution.
  • Suitable peroxy bleach compounds include organic peroxides such as urea peroxide, and inorganic persalts such as the alkali metal perborates, percarbonates, perphosphates, persilicates and persulphates.
  • Preferred inorganic persalts are sodium perborate monohydrate and tetrahydrate, and sodium percarbonate.
  • sodium percarbonate having a protective coating against destabilisation by moisture Sodium percarbonate having a protective coating comprising sodium metaborate and sodium silicate is disclosed in GB 2 123 044B (Kao ).
  • the peroxy bleach compound is suitably present in an amount of from 5 to 35% by weight, preferably from 10 to 25% by weight.
  • the peroxy bleach compound may be used in conjunction with a bleach activator (bleach precursor) to improve bleaching action at low wash temperatures.
  • the bleach precursor is suitably present in an amount of from 1 to 8% by weight, preferably from 2 to 5% by weight.
  • Preferred bleach precursors are peroxycarboxylic acid precursors, more especially peracetic acid precursors and peroxybenzoic acid precursors; and peroxycarbonic acid precursors.
  • An especially preferred bleach precursor suitable for use in the present invention is N,N,N',N'-tetracetyl ethylenediamine (TAED).
  • TAED N,N,N',N'-tetracetyl ethylenediamine
  • peroxybenzoic acid precursors in particular, N,N,N-trimethylammonium toluoyloxy benzene sulphonate.
  • a bleach stabiliser may also be present in the main wash detergent powder.
  • Suitable bleach stabilisers include ethylenediamine tetraacetate (EDTA) and the polyphosphonates such as Dequest (Trade Mark), EDTMP.
  • EDTA ethylenediamine tetraacetate
  • Dequest Trade Mark
  • the said powder it is preferred for the said powder to contain no bleach and to rely on the improved clay stain removal derived from the novel hydroxamate and surfactant combinationpresent in the liquid pre-treatment composition used in the 1 st step of the method of the invention.
  • the main wash detergent formulation may also contain one or more enzymes.
  • Suitable enzymes include the proteases, amylases, cellulases, oxidases, peroxidases and lipases usable for incorporation in detergent compositions.
  • Said detergency enzymes are commonly employed in granular form in amounts of from about 0.1 to about 3.0 wt%. However, any suitable physical form of enzyme may be used in any effective amount.
  • Antiredeposition agents for example cellulose esters and ethers, for example sodium carboxymethyl cellulose, may also be present.
  • the main wash detergent formulation may also contain soil release polymers, for example sulphonated and unsulphonated PET/POET polymers, both end-capped and non-end-capped, and polyethylene glycol/polyvinyl alcohol graft copolymers such as Sokolan (Trade Mark) HP22.
  • soil release polymers for example sulphonated and unsulphonated PET/POET polymers, both end-capped and non-end-capped, and polyethylene glycol/polyvinyl alcohol graft copolymers such as Sokolan (Trade Mark) HP22.
  • soil release polymers for example sulphonated and unsulphonated PET/POET polymers, both end-capped and non-end-capped, and polyethylene glycol/polyvinyl alcohol graft copolymers such as Sokolan (Trade Mark) HP22.
  • Sokolan Trade Mark
  • the pre-treatment composition used in the first step of the method of the invention is in the liquid form.
  • said composition contains a hydrotrope to solubilise the ingredients thereof.
  • Ethanol is preferably avoided.
  • Preferred hydrotropes are propylene glycol and glycerol. Based on this teaching the skilled person will be able to select other hydrotropes that avoid the use of highly volatile solvents like ethanol without the need for inventive activity.
  • the main wash detergent powders preferably used in the second step of the method of the invention may be of low to moderate bulk density. In that case they may be prepared by spray-drying slurry, and optionally post dosing (dry-mixing) further ingredients. Routes available for powder manufacture include spray drying, drum drying, fluid bed drying, and scraped film drying devices such as the wiped film evaporator. A preferred form of scraped film device is a wiped film evaporator. One such suitable wiped film evaporator is the 'Dryex system' based on a wiped film evaporator available from Ballestra S.p.A. Alternative equipment would be the Chemithon the 'Turbo Tube' dryer system wherein a high active surfactant paste is heated and metering to a multi tube, steam-jacketed drying vessel.
  • the main wash powder may be a 'Concentrated' or 'compact' powder.
  • Such powders may be prepared by mixing and granulating processes, for example, using a high-speed mixer/granulator, or other non-tower processes.
  • SRI is a measure of how much of a stain on textile is removed during a washing process.
  • a SRI of 100 means complete removal of a stain.
  • ⁇ E after wash is the difference in L a b colour space between the clean (unwashed) fabric and the stain after wash. So a ⁇ E after wash of zero means a stain that is completely removed. Therefore, a SRI aw (aw: after wash) of 100 is a completely removed stain.
  • the clean (or virgin) fabric is an "absolute standard" which is not washed. For each experiment, it refers to an identical piece of fabric to that to which the stain is applied. Therefore, its point in L a b colour space stays constant.
  • Tergometer wash protocol For the determination of the SRI-values, a standard protocol was used, called the Tergometer wash protocol. Said Tergometer wash protocol is as follows:
  • Example 1 Removal of a Indian Red Soil on knitted polyester, preteated with a liquid Formualtion and then washed using a powder formulation
  • formulations A and B Two liquid formulations A and B were formulated.
  • the surfactants present therein are sodium alkyl benzene sulphonate (Na LAS anionic) and alkyl ether sulfate (SLES 3EO Ex Unilever).
  • formulation B contains a Coco Hydroxamic Acid (Ex AXIS House), as shown in Table 1.
  • Other standard laundry ingredients were also included.
  • the pH of these formulations was buffered to between 7 and 8.5.
  • the formulations were made using demineralised water.
  • Table 1 Liquid formulations used Ingredients A B wt % in final product Mono propyl glycol 3.7 3.7 Glycerol 1.1 1.1 NaOH 1.3 1.3 TEA 1.95 1.95 NaLAS 14.8 14.8 SLES (3EO) 3.7 3.7 Coco Hydroxamic Acid (Ex Axis House 0.5 Savinase Ultra 16L 0.1 0.1 Balance (demineralised water, perfume) 73.45 72.85
  • a main-wash type detergent powder product C including the surfactant alkyl benzene sulphonate was formulated having the composition shown in Table 2.
  • Table 2 Powder detergent product C Ingredient Wt % in Final Product LAS 20 Zeolite 4 sodium silicate 9.6 Soda Ash 20.2 Sodium Sulphate 33.8 Moisture 3.2 Minors (including enzyme, perfume, pigments and flow aids) 9.2
  • Table 3 shows the clear benefit in removal when pretreating stain with a formulation containing alkyl hydroxamic acid.
  • Example 2 Removal of a Indian Red Soil on knitted polyester and woven cotton, preteated with Liquid (Anionic/Nonionic)Formualtions and then washed using a powder formulation
  • formulations D and E Two liquid formulations D and E were formulated.
  • the surfactants present therein are sodium alkyl benzene sulphonate (Na LAS anionic) and alcohol ethoxylate (Neodol 25-7).
  • formulation E contains a Coco Hydroxamic Acid (Ex AXIS House), as shown in Table 4. Other standard laundry ingredients were also included.
  • the pH of these formulations was buffered to between 7 and 8.5.
  • the formulations were made using demineralised water.
  • the powder product used in this example was the same as that of example 1.
  • Table 5 shows the clear benefit in removal when pretreating stain with a formulation containing alkyl hydroxamic acid.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Detergent Compositions (AREA)
EP12708849.0A 2011-03-22 2012-03-15 Method of cleaning laundry Active EP2688995B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12708849.0A EP2688995B1 (en) 2011-03-22 2012-03-15 Method of cleaning laundry
PL12708849T PL2688995T3 (pl) 2011-03-22 2012-03-15 Sposób czyszczenia prania

Applications Claiming Priority (3)

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EP11159109 2011-03-22
EP12708849.0A EP2688995B1 (en) 2011-03-22 2012-03-15 Method of cleaning laundry
PCT/EP2012/054566 WO2012126801A1 (en) 2011-03-22 2012-03-15 Method of cleaning laundry

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EP2688995A1 EP2688995A1 (en) 2014-01-29
EP2688995B1 true EP2688995B1 (en) 2017-01-04

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CN (1) CN103502413B (es)
AU (1) AU2012230538B2 (es)
BR (1) BR112013024145B1 (es)
CA (1) CA2830287A1 (es)
ES (1) ES2620244T3 (es)
PL (1) PL2688995T3 (es)
WO (1) WO2012126801A1 (es)
ZA (1) ZA201307327B (es)

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Publication number Priority date Publication date Assignee Title
EP2917318B1 (en) * 2012-11-09 2016-12-21 Unilever N.V. A composition and method for treating substrates
CN113825828B (zh) * 2019-06-14 2023-10-13 陶氏环球技术有限责任公司 液体衣物洗涤剂配制物

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Publication number Priority date Publication date Assignee Title
BE759430A (fr) 1969-11-27 1971-05-25 Unilever Nv Compositions detergentes
GB2123044B (en) 1982-06-10 1986-02-05 Kao Corp Bleaching detergent composition
US4874539A (en) 1987-08-06 1989-10-17 American Cyanamid Company Carboxy hydroxamic acid polymers and their use as detergent additives
US5093040A (en) * 1987-08-12 1992-03-03 American Cyanamid Company Complex N-hydroxyimide compounds and their use as detergent additives
US4863636A (en) 1988-02-12 1989-09-05 American Cyanamid Company Substituted N-hydroxyphthalimides and their use as detergent additives
EP0384912A3 (en) 1989-02-21 1991-09-11 Monsanto Company Hydroxamate bleach stabilizer
CA2010464A1 (en) * 1989-02-21 1990-08-21 Bronislav H. May Stabilized compositions containing peroxygen compounds
GB8906089D0 (en) 1989-03-16 1989-04-26 Monsanto Europe Sa Improved detergent compositions
FR2720400B1 (fr) 1994-05-30 1996-06-28 Rhone Poulenc Chimie Nouveaux polyesters sulfones et leur utilisation comme agent anti-salissure dans les compositions détergentes, de rinçage, d'adoucissage et de traitement des textiles.
EP0845026A1 (de) 1996-06-19 1998-06-03 CALL, Hans-Peter Dr. Mehrkomponentensystem zur verwendung mit waschaktiven substanzen
GB0810881D0 (en) * 2008-06-16 2008-07-23 Unilever Plc Improvements relating to fabric cleaning
PL2358852T3 (pl) * 2008-12-17 2019-09-30 Unilever N.V. Kompozycja detergentowa do prania

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BR112013024145A2 (pt) 2016-12-20
PL2688995T3 (pl) 2017-07-31
AU2012230538A1 (en) 2013-10-17
ES2620244T8 (es) 2021-08-24
ZA201307327B (en) 2015-01-28
CN103502413A (zh) 2014-01-08
CA2830287A1 (en) 2012-09-27
WO2012126801A1 (en) 2012-09-27
ES2620244T3 (es) 2017-06-28
CN103502413B (zh) 2016-03-23
AU2012230538B2 (en) 2014-10-09
EP2688995A1 (en) 2014-01-29
BR112013024145B1 (pt) 2020-11-03

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