MXPA97006537A - Pre-treatment for laundry with peroxide whiteners containing chlatators for fierro, copper and manganese for damage to reduced fabrics - Google Patents

Abstract

The present invention relates to a process for the pre-treatment of soiled fabrics with a liquid composition comprising a peroxygen bleach, butyl-hydroxytoluene, a nonionic surfactant system, an anionic surfactant comprising an alkyl sulfate and / or an alkyl sulfate. ethoxylated, and a copper and / or manganese chelating compound, selected from the group consisting of ethylene diamine N, N'-disuccinic acid or an alkali metal or alkaline earth metal or ammonium or substituted ammonium salts thereof, diethylenetriaminpentaacetic acid, acid methylglycliciacetic acid, diethylenetriaminpentamethylenephosphonic acid, hydroxyethanediphosphonic acid, propylene diamine tetraacetic acid, 2-hydroxypyridine N-oxide, N, N-oxide of ethylenedinitrilotertraquis (methylene phosphonic acid) and mixtures thereof, wherein said nonionic surfactant system includes one or more non-ionic surfactants. ionics selected from the group consisting of tensio agents nonionic hydrophobic actives having an HLB of up to 9 and having the formula RO - (C2H4O) n (C3H6O) mH, wherein R is an alkyl chain of C6 to C22 or an alkylbenzene chain of C6 to C28 and mixtures of them, and where n + m is from 0.5 to 5 and n is from 0 to 5 and m is from 0 to 5, said process being characterized in that it comprises the steps of applying said composition in its pure form on the fabric and allowing said composition remains in contact with said fabric without allowing the composition to dry on said fabric, before said fabric is washed

Description

PRE-TREATMENT STOP LAUNDRY WITH PEROXIDE WHITENERS CONTAINING CHLATATORS FOR FIERRO, COPPER AND MANGANESE FOR REDUCED FABRIC DAMAGE TECHNICAL FIELD The present invention relates to the pretreatment of soiled fabrics, to compositions suitable for use as a co-retardant, and to a process of treatment.

BACKGROUND They have described ex-tensive compositions containing peroxygen bleach in laundry detergent applications, laundry additives and even laundry pretreatments In fact, it is known to use such compositions containing peroxygen bleach in pretreatment applications for laundry to promote the removal of stains / incrustations that are otherwise difficult to remove in particular, such as grease, coffee, tea, grass, dirt containing mud / clay and the like, however, it has been found that a disadvantage associated with said peroxyl ene bleach-containing compositions that said compositions can damage fabrics when used in a pretreatment application, i.e., when applied directly to the fabrics, and allowed to act on said fabrics for prolonged periods before washing said fabrics. In this way, an object of the present invention is to provide Improved security for fabrics when pretreating fabrics with compositions containing peroxygen bleach, especially in those applications where said compositions are left in contact with said fabrics for prolonged periods, before washing said fabrics. It has been found that when the fabrics are pretreated with compositions comprising a peroxygen bleach such as hydrogen peroxide, the presence of metallic ions such as copper and / or iron and / or manganese on the surface of the fabrics causes damage to the fabrics. resulting in the loss of resistance to the -tension of the fibers of + elas. It is speculated that the presence of metal ions-such as charge and / or iron and / or manganese on the surface of fabrics, especially in cellulosic fibers-catalyzes the radical decomposition of peroxygen bleaches such as hydrogen peroxide. In this way, a reaction with radicals occurs on the surface of the fabric with the generation of free radicals, which results in loss of tensile strength. Therefore, it was found to be essential that this reaction with surface radicals be controlled in the pretreatment environment, thus providing improved security for the fabrics.

It has now been discovered that this can be achieved by formulating a composition containing peroxygen bleach comprising a compound for chelating copper and / or iron and / or manganese. More particularly, it has been found that the use of a compound to chelate copper and / or iron and / or manganese, and preferably diethylene triarnin penta methylene phosphonic acid (DTPMP), hydroxy ethane di phosphonic acid (HEDP), ethylene diamine N , N'-d? Succímco (EDDS), rnetil glicm d? -acé +? Co (MGDA) acid, die-t len -triam n penta ace + ico (DTPA), propylene diarnm -tetrace + ico acid (PDTP ), 2-hydroxypropionate (HPNO), or ethylenedimethylpyrrolidine N, Nb? Oxid methylenephosphonic acid, in a composition containing peroxygen bleach, considerably reduces the damage in a fabric pretreated with said composition. An advantage associated with the use of a peroxygen bleach-containing composition comprising said compound for chelating copper and / or fi re and / or manganese, in a laundry pretreatment application, is that -the damage to the color is also reduced. . Another advantage of the present invention is that excellent laundry performance is provided in whitening spots as well as in the removal of greasy spots. Another advantage of the present invention is that compositions suitable for use in accordance with the present invention also provide excellent performance when used in other applications., apart from the pre-laundry laundry application, such as in other laundry applications, such as a laundry detergent or laundry additive, or even in applications to clean hard surfaces. In one embodiment of the present invention it was also discovered that the use of a chelating agent such as e + ilendinitplotertraq? Is N, Nb? Oxide of me + ilenphosphamic acid, hydroxy-ethane diphosphonic acid (HEDP) and / or? N agent a chelator having two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions so as to form complexes with metal ions where each metal ion is complexed by molecules of chelating agents such as zinc. -h? drox? p? nd? n-oxide, allows the formulation of acidic liquid compositions suitable for pretreating fabrics which exhibit improved chemical stability in prolonged storage time. Compositions containing peroxygen bleach have been extensively described in the art. EP-A-629691 discloses emulsions of nonionic surfactants comprising a silicone compound, and as optional ingredients, hydrogen peroxide, or a water-soluble source thereof, and chelators. The only chelator described is S, S-et? Len Dysuccinic diarrhea (see examples). Although the pretreatment application for the compositions of EP-A 629691 is described, the use of peroxygen bleach-containing compositions comprising a copper and / or iron and / or manganese chelating compound for pretreating fabrics is nowhere described. , wherein the loss of tensile strength in said fabrics is reduced. EP-A-629690 discloses emulsions of non-ionic surfactants comprising a terephthalate-based polymer, and as optional ingredients, hydrogen peroxide, or a water-soluble source thereof, and q-elastomers. The only chelator described is S, S-ethylene diarrino disuccinic acid (see examples). Although the pretreatment application for the compositions of EP-A 629690 is described, nowhere is there disclosed the use of peroxygen bleach-containing compositions comprising a copper and / or iron and / or manganese chelator compound, for pretreat fabrics, where the loss of resistance to the stress in said fabrics is reduced. EP-B-209 228 discloses compositions comprising a source of peroxide or hydrogen peroxide, an amino polyphosphonate chelator and a radical scavenger. Diethylene triamine penta rnetylene phosphonic acid is expressly described. EP-B-209 228 also discloses that compositions containing hydrogen peroxide can be used as pretreatments. However, nowhere is it mentioned that peroxygen bleach-containing compositions comprising a copper and / or iron and / or manganese chelating compound, for pretreating fabrics, allow the reduction of the loss of tensile strength. in such fabrics.

BRIEF DESCRIPTION OF THE INVENTION The present invention encompasses the use of a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelator compound, for pretreating a soiled fabric prior to washing said fabric, wherein the loss of the resistance to tension in said fabric. The present invention further encompasses a process for pretreating soiled fabrics with a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelating compound, and said process comprises the steps of applying said composition to its ur shape on the fabric and allow said composition to remain in contact with said fabric without allowing said composition to dry on said fabric, before washing said fabric. The present invention further encompasses a liquid detergent composition comprising a peroxygen bleach and, as a copper and / or iron and / or manganese chelator compound, methyl glycine d-acetic acid, propylene diarynin teracetic acid, 2 -hydrox ipiri in-N-oxide, etilendinitplotertraquis N, Nb oxide rnet ilelenfosónico acid, hydroxyethane d phosphonic acid, or mixtures of the rni srnos.

DETAILED DESCRIPTION OF THE INVENTION In its broadest aspect, the present invention encompasses the use of a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelator compound, to pretreat a soiled fabric prior to washing said fabric, wherein the loss of tensile strength in said fabric is reduced. The present invention is based on the discovery that, the loss of tensile strength arising from damage to the fabric is reduced, when the compositions comprising a peroxygen bleach and a copper and / or iron chelator compound and / or Manganese in accordance with the present invention are used to pretreat soiled fabrics, as compared to the use of the same compositions but in a copper and / or iron and / or manganese chelating compound, to pre-treat said fabrics. By "for pretreating soiled fabrics" it is to be understood that the liquid composition is applied in its pure form on the soiled fabric and is to be actuated on said fabric before washing said fabric, as described below, in the process for pretreating fabrics dirty in accordance with the present invention. In other words, the use of a composition containing peroxygen bleach comprising a copper and / or iron and / or manganese chelator compound in accordance with the present invention allows to considerably reduce the loss of tensile strength caused by the presence of copper and / or iron and / or manganese on the surface of the fabric, even if said composition is left on the fabric to be etched for a prolonged period before washing said fabric, for example, approximately 24 hours, and even if said fabric is contaminated by high levels of copper and / or iron and / or manganese. The loss of tensile strength of a fabric can be measured using the Stress Resistance method, as can be seen in the examples below. This method consists of measuring the tensile strength of a given fabric by stretching said fabrics until it breaks. The force, expressed in Kg, necessary to break the fabric is the "Resistance to Essential Tension" and can be measured with "The Stress-Strain INSTRON machine". By "loss of tensile strength" one must understand the difference when comparing the tensile strength of a cloth as a reference, that is, a cloth that has not been pretreated, and the tensile strength of the cloth. same cloth after having been pretreated in accordance with the present invention. A loss of tensile strength of zero means no damage to the fabric was observed. An advantage associated with the present invention is that color damage is also reduced. In fact, the color change and / or discoloration observed when pretreating soiled colored fabrics with a peroxygen bleach-containing composition comprising a copper and / or iron and / or manganese chelating compound according to the present invention is reduced. invention, compared to the color change and / or discoloration observed when the same composition is used but without a compound for chelating copper and / or iron and / or manganese, this even if said composition is left on the fabrics for prolonged periods before wash said fabrics. Accordingly, the present invention also encompasses the use of a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelating compound for pretreating a soiled color cloth before washing said fabric, where the color damage of said fabric is reduced. Also the reduction of the loss of tensile strength of the fabric and / or the reduction of color damage of the fabric are obtained with liquid compositions comprising a peroxygen bleach and a copper and / or iron chelator compound and / or or manganese without compromising the bleaching performance nor the operation of the stain removal given by said compositions. The present invention also encompasses a process for pretreating soiled fabrics with a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese quenching compound, said process comprising the steps of applying said composition in its composition. Pure form on the fabric and allow said composition to remain in contact with said fabric without allowing said composition to dry on said fabric, before washing said fabric. Said composition may remain in contact with said fabric, typically for a period of 1 minute to 24 hours, preferably 1 minute to 1 hour and most preferred 5 minutes to 30 minutes. Optionally, when the fabric becomes soiled with embedded stains / stains that would otherwise be difficult to remove, the compositions according to the present invention can be rubbed and / or brushed more or less intensively, for example, by means of a sponge or a brush or simply rubbing two pieces of cloth against each other. By "washing" it is to be understood herein simply to rinse the fabrics with water, or the fabrics can be washed with conventional compositions comprising at least one surfactant, this by means of a washing machine or simply by hand. By "in its pure form" it is to be understood that the compositions described herein are applied to the fabrics to be pretreated without being diluted, ie, they are applied as described herein. In accordance with the process for pretreating soiled fabrics of the present invention, the liquid compositions used in said process should not be allowed to dry on the fabrics. In fact, it has been found that the evaporation of water contributes to the increase in the concentration of free radicals on the surface of the fabrics and, consequently, the speed of the chain reaction. It is also speculated that an oxidation reaction occurs in the evaporation of water when the liquid compositions are allowed to dry on the fabrics. Said auto-oxidation reaction generates peroxy radicals that can contribute to cellulose degradation. Thus, without leaving the liquid compositions, as described herein, to be dried on the fabrics, in the process for pretreating soiled fabrics in accordance with the present invention, contributes to the benefits in accordance with the present invention, it is say, to reduce the loss of tensile strength when pretreating fabrics as liquid compositions containing peroxygen bleach. As an essential element, compositions suitable for use in accordance with the present invention comprise a peroxygen bleach. The preferred peroxygen bleach is hydrogen peroxide, or a water soluble source thereof, or mixtures thereof. Most preferred is hydrogen peroxide for use in the compositions according to the present invention. As used herein, a source of hydrogen peroxide refers to any compound that produces hydrogen peroxide when said composition is in contact with water. Suitable water soluble sources of hydrogen peroxide for use herein include percarbonates, persilicate, persulfate such as rnonopersulfate, perborates and peroxyacids such as diperoxidedecandioic acid (DPDA), magnesium peristaltic acid and mixtures of the same. Typically, compositions suitable for use herein comprise from 0.5% to 20% by weight of the total composition of said peroxygen bleach, preferably from 2% to 15% and most preferably from 2% to 10%. In fact, the presence of peroxygen bleach, preferably hydrogen peroxide, provides strong cleaning benefits that are notable in particular in laundry applications. With a second essential ingredient, compositions suitable for use in accordance with the present invention comprise a copper and / or iron and / or manganese chelator compound. Typically, compositions suitable for use herein comprise from 0.005% to 2% by weight of the total composition of said copper and / or iron and / or manganese chelating compound, or mixtures thereof, preferably from 0.01% to 1%. % and very preferred from 0.01% to 0.5%. Said copper and / or iron and / or manganese chelating compound can be any compound capable of joining copper and / or iron and / or manganese. Said copper and / or iron and / or manganese chelating compounds can be selected from the group consisting of phosphonate chelators, incarboxylate chelating agents, polyfunctionally substituted aromatic chelating agents or polycarboxylic acids of pipdine and the like, or mixtures of the same . Said phosphonate chelators may include etidronic acid, hydroxy-ethane di phosphonic acid (HEDP) and ethylene dinitrite L, N-oxide rnetylene phosphonic acid as well as amino phosphonate compounds such as amino alkylene polyalkylene, foefonate, 1-hydroxyl? of alkali metal ethane phosphonates, nitrile tri ethylene phosphonates, ethylene diamine tetra in phosphonates, and diethylene triamine penta methyl phosphonates. The phosphonate compounds may be present either in their acid form or as salts of different cations in some or all of their acid functionalities. Phosphonate chelators are commercially available from Monsanto under the trademark DEOUESTR. Preferred phosphonate chelators for use herein are diethylene triaryl penta ethylene phosphonates, hydroxy ethanedi diphosphonic acid (H DP) and ethylenedi nitrilotertraq? I s N, N-oxide metal methylene phosphonic acid. It has been found that hydroxy-ethane diphosphonic acid and ethylenedinitrilotertraq? Is N, N-oxide rnetiienphosphonic acid are particularly resistant to protonation and oxidation. In this manner, the hydroxy-ethane diphosphonic acid and ethylenedinitrilotertraquis N, methylene phosphonic acid oxide are suitable in particular for the application in liquid liquid compositions as a compound for chelating copper and / or iron and / or manganese in accordance with the present invention. where the security of the fabric is improved. In fact, the hydroxy-ethane diphosphonic acid and ethylene-nitrilotertraquis N, N-oxide of ethylene phosphonic acid allow the formulation of liquid liquid compositions containing peroxygen bleach with improved chemical stability compared to the same compositions without said chelating agent, for example, acid diethylene triamin penta rnetilen phosphonic, instead of said chelating agent. In this way, another aspect of the present invention is the use of hydroxy-ethane diphosphonic acid and ethylene-diphenyl ether rachis N, N-oxide of methylene phosphonic acid, in an acid liquid composition containing peroxygen bleach, wherein it improves the chemical stability of said composition, that is, the speed of said bleach is reduced in a prolonged storage time of said composition. Poly-functionally substituted aromatic chelating agents can be * also useful in the compositions herein. See the Patent of E.U.A. 3,812,044, issued May 21, 1974, to Connor and others. The preferred compounds of this type in acid form are dihydroxydisulfobenzenes such as l, 2-dihydroxy-3,5-dis? Lfobenzene. A preferred biodegradable chelating agent to be used herein is ethylen dia in N, N'-disuccinic acid, or alkali metal, alkaline earth metal, ammonium or ammonium substitutes thereof or mixtures thereof. Numerous ethylene diamine acids, especially the (S, S) isomer, have been extensively described in U.S. Pat. 4,704,233, November 3, 1987, to Hartman and Perkins. For example, the eti-lendiarnm N, N'-disuccimic acids are commercially available under the trademark seEDDS "from Palmer Research Laboratories.These amino carboxylates useful as copper and / or iron and / or manganese chelating compounds include ethylenitrile tetra acetates, diethylene tparnin pentaacetates, diethylenetriarnin pentoacetate (DTPA), N-hydroxyethylethylenediarnin tpacetates, nitrilotoplacetates, ethanediglycidines, propylene diaryn tetracetic acid (PDTA) and netil glycine di-acetic acid (MGDA), in its acid form, or in its forms of alkali metal, ammonium and substituted ammonium salt Particularly suitable for use herein are diethylene triamine penta acetic acid (DTPA), propylene dia in tetracetic acid (PDTA) which is, for example, available commercially from BASF under the trademark Tplon FS * and rnetyl glycine di-acetic acid (MGDA). The polycarboxylic acids of pindma suitable for use herein include acid. or dipicolinic The preferred dipicolinic acid herein is used in admixture with another copper and / or iron and / or manganese chelating agent in accordance with the present invention. In fact, dipicolimic acid is preferably added on top of other chelators present in the liquid composition according to the present invention to improve the chemical stability of said composition. Other chelating agents suitable for use as copper and / or iron and / or manganese chelating compounds include chelating agents having two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions so as to form complexes with metal ions where the metal ion is formed in complexes by 3 molecules of chelating agents (3: 1 chelating agent. metal iontoichiometry). In other words, said chelating agents occupy the coordination sphere of the metal ion, rendering it inactive catalytically. It has been discovered that said chelating agents are resistant in particular to protonation and / or oxidation. In this way, said chelating agents are particularly suitable for application in liquid acid compositions as a copper and / or iron and / or manganese chelator compound in accordance with the present invention where the fabric safety is improved. In fact, said chelating agents having two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions allow the formulation of peroxygen bleach containing compositions with improved chemical stability compared to the same. compositions without chelating agents or in comparison with the same compositions with another chelating agent, for example, diethylene tria in pentanetilen phosphomene, instead of said chelating agents. Thus, another aspect of the present invention is the use of q? Elatadore agents having two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions so as to be complex with the metal ions in where each metal ion is formed in complexes by 3 molecules of said chelating agents, in an acid liquid composition containing peroxygen bleach, wherein it improves the chemical stability of said composition, that is, the decomposition rate of said bleach is reduced over a prolonged storage time of said composition. Such chelating agents having two electron donor groups capable of occupying adjacent coordination sites in the coordination metal ion sphere include chelating agents having at least one ionized carboxylate directly adjacent to one of the following groups: a non-ionized carboxylate, a hydroxyl group, an amine group or an N-oxide group. Particularly suitable for use herein are malonic acid, 2-hydroxypipdin-N-oxy, or mixtures of the same. For example, 2-hydroxy-pyridine-N-oxide is commercially available from Pyrion Chemie (Germany) under the trademark 2-hydroxy-pyridine-N-oxide. According to the present invention, the liquid compositions comprising a peroxygen bleach and, as a copper and / or iron and / or manganese chelator compound, propylene diarynter tetraetic acid (PDTA), rnetyl glyc di-acetic acid (MGDñ) , diethylene tparnin penta methylene phosphonate (DTPMP), hydroxy-ethane diphosphonic acid (HEDP), ethylendiarnin N, N'-d? succinic acid (EDDS), 2-hydrox? p? pd? nN-oxido (HPNO), and / or eti? N? N? Tr *? Lotertraqu? S N, N-oxide of rnetiienfosfómez acid, in fact do not provide loss of resistance to tension in fabrics pretreated with the same, ie *, the strength of the fabric is not reduced, even in prolonged contact periods of said compositions on said fabrics, for example, 24 hours. Accordingly, the present invention also encompasses liquid compositions comprising a peroxygen bleach, as described above and, as the copper and / or iron and / or manganese chelating compound, propylene diaryn tetracetic acid (PDTP), acid rnetyl di-acetic glycid (MGDA), 2-hydroxy pd-n-oxido, hydroxy-ethane diphosphonic acid, or mixtures of the same. The following description of the compositions relates to the compositions of the present invention claimed by itself, to the compositions according to the present invention for pretreating soiled fabrics and to the compositions applied on the fabrics in accordance with the process for pretreating said fabrics from the present invention.

The compositions according to the present invention are aqueous liquid cleaning compositions. Said aqueous compositions have a pH which is from 1 to 9, preferably from 2 to 6 and preferably from 3 to 5. The pH of the compositions can be adjusted using organic or inorganic acids, or alkalizing agents. The compositions in accordance with the present invention may further comprise a variety of optional ingredients such as radical scavengers, detergent agents, builders, stabilizers, other chelators, soil suspending agents, dye transfer agents, solvents. , brighteners, perfumes, antioxidants, suppressors of foams and dyes. A preferred optional ingredient of the compositions according to the present invention is a radical scavenger or mixtures thereof. Suitable radical scavengers for use herein include the well-known substituted mono and dihydroxybenzenes and their analogues, alkyl and aryl carboxylates and mixtures thereof. Preferred radical scavengers for use herein include benzyl hydroxy toluene, hydroquinone, di-tert-butyl hydroquinone, mono-tert-butyl hydroquinone, tert-butyl-hydroxy anisole, benzoic acid, tucumic acid, catechol, useful catechol, benzylamine, 1, 1, 3-t-ris (2-rnethyl-4-hydroxy-5-t-butylphenyl) butane, commercially available under the trademark Topanol CAR ex ICT, as well as n-propyl -Galato. When radical scavengers are used they are typically present in amounts ranging from 0.001% to 2% by weight of the total composition and preferably from 0.001% to 0.5% by weight. The compositions according to the present invention may further comprise any surfactant known to those skilled in the art including nonionic, ammonium, cationic, zwitterionic or amphoteric surfactants. The compositions according to the present invention preferably comprise any of the nonionic surfactants or mixtures thereof described below and / or any of the anionic surfactants or mixtures thereof described below. Typically, the compositions according to the present invention may comprise up to 50% by weight of the total composition of a surfactant, or mixtures thereof. The compositions of the present invention may also comprise a liquid hydrophobic bleach activator, as a highly preferred optional ingredient. By "bleach activator" is meant herein a compound that reacts with hydrogen peroxide to form a peracid. In this way, the peracid formed constitutes the bleach activator. By "hydrophobic bleach activator" is meant herein an activator that is not substantially and stably miscible with water. Typically, said hydrophobic bleach activators have an HLB less than 11. Such suitable liquid hydrophobic bleach activators typically belong to the class of esters, amides, irides or anhydrides. A particular family of bleach activators of interest was described in EP 624 154, and particularly preferred in that family is acetyl triethyl citrate (ATO) The ATC has the other advantages that it is friendly to both as to when it is finally degraded in acid citric and alcohol Also, ATC has good hydrolytic stability in the compositions herein, and is an efficient bleach activator Finally, it provides good build capacity to the compositions It is also possible to use mixtures of liquid hydrophobic bleach activators in The compositions herein can comprise up to 20% by weight of the total composition of said bleach activator or mixtures of the ism, preferably from 2% to 10%, most preferred from 3% to 7%. contain peroxygen bleach in accordance with the present invention further comprise a liquid hydrophobic bleach activator is highly desired in the to present for stability purpose to formulate said compositions as aqueous emulsions of surfactants comprising said liquid hydrophobic bleach activator, or as microemulsions of said liquid hydrophobic bleach activator in a matrix comprising water, the peroxygen bleach and a hydrophilic surfactant system comprising an agent "~ anionic surfactant and a nonionic surfactant. In the embodiment of the present invention wherein the peroxygen bleach-containing compositions of the present invention further comprise said bleach activator and are formulated as aqueous emulsions, said peroxygen bleach-containing emulsions comprise a system of a surface-active agent and a surfactant. thus, different surfactants are present, ie, at least one hydrophobic surfactant having a HLK of up to 9 and at least one hydrophilic surfactant having an HLB above 10 in order to emulsify the liquid hydrophobic bleach activator. In fact, said two different surfactants in order to form emulsions that are stable must have different HLB (hydrophilic-lipophilic balance) values, and preferably the difference in value of the HLBs of said two surfactants is therefore minus 1, preferably at least 3. In other words, by properly combining at least two of said surfactants with different HLBs in water, stable emulsions will be formed, i.e., emulsions that do not substantially separate into separate layers, in rep > bear for at least two weeks at 5p ° c. The emulsions according to the present invention comprise from 2% to 50% by weight of the total composition of said hydrophilic and hydrophobic surface active agents, preferably from 5% to 40% and most preferred from 8% to 30%. The emulsions according to the present invention comprise at least 0.1% by weight of the total emulsion of said hydrophobic surfactant, or mixtures thereof, preferably at least 3% and most preferred at least 5% and by less 0.1% by weight of the total emulsion of said hydrophilic surfactant, or mixtures thereof, preferably at least 3% and most preferred at least 6%. Preferred for use herein are hydrophobic nonionic surfactants and hydrophilic nonionic surfactants. Said hydrophobic nonionic surfactants for use herein have an HLB of up to 9, preferably less than 9, highly preferred less than 8, and said hydrophilic surfactants have an HLB above 10, preferably over 11, preferably above H? In fact, the non-ionic hydrophobic surfactants for use herein have excellent properties for cutting grease, that is, they have a solvent effect that contributes to the removal of hydrophobic soils. The hydrophobic surfactants act as a vehicle for the hydrophobic brighteners in the fabrics allowing said brighteners to operate in close proximity to the surface of the fabrics at the beginning of the wash. Suitable nonionic surfactants for use herein include preferably alkoxylated fatty alcohols, fatty alcohol ethoxylates and / or propyxylates. In fact, a wide variety of said alkoxylated fatty alcohols are commercially available having very different HLB (hydrophilic-lipophilic balance) values. The HLB values of said alkoxylated nonionic surfactants depend essentially on the chain length of the fatty alcohol, the nature of the alkoxylation and the degree of alkoxylation. The nonionic hydrophilic surfactants tend to have a high degree of alkoxylation and a short chain fatty alcohol, while the hydrophobic surfactants tend to have a low degree of alkoxylation and a long chain fatty alcohol. The catalogs of surfactants are available which list a number of surfactant agents including nonionics, together with their respective HLB values. Suitable chemical processes for preparing the nonionic surfactants for use herein include the condensation of corresponding alcohols with alkylene oxide., in the desired proportions. Such methods are well known to the person skilled in the art and have been extensively described in the art. As an alternative, a wide variety of alkoxylated alcohols to be used herein are commercially available from various suppliers. The preferred hydrophobic nonionic surfactants for use herein according to the present invention are surfactants having an HLB of up to 9 and are in accordance with the formula R0- (C2H0O) n (C3H6?) MH, in where R is an alkyl chain of Ce to C22 or an alkylbenzene chain of Ce to C28, V wherein n + rn is from 0.5 to 5 and n is from 0 to 4. Preferred R chains for use herein are those alkyl chains from Ce to C22 - Accordingly, suitable hydrophobic nonionic surfactants for use herein are Dobanol® 91-2.5 (HLB = 8.1; R is a mixture of alkyl chains of C9 to Cu n is 2.5 and m is 0), or Lutensol "T03 (HLB = 8; R is a mixture of alkyl chains of C13 to C15, n is 3 and is 0), or Tergitol R 25L3 (HLB = 7.7, R is on the alkyl chain length scale of C12 to C15, n ee 3 and m ee 0), or DobanolR 23-3 (HLB = 8.1, R is a mixture of alkyl chains from C12 to C13, n is 3 and m is 0) or DobanolR 23-2 (HLB = 6.2, R is a mixture of C12 to C13 alkyl chains, n is 2 and is 0), or mixtures thereof. they prefer in the present Dobanol® 23-3, or Dobanol® 23-2, Lutensol "T03, or mixtures thereof. This is the available DobanolR eetán tenement agents commercially available from SHELL. These Lutensol surfactants are commercially available from BASF and are available as Tergitol® tertiary agents available commercially from UNION CARBIDE. Other hydrophobic nonionic surfactants suitable for use herein are non-alkoxylated surfactants. An example is Dobanol 23 (HLB < 3). ? ñ Preferred hydrophilic nonionic surfactants for use in the resin according to the present invention are surfactants having an HLB above 10 and conforming to the formula R0- (C2H «0) n (C3H6?) MH, where R is an alkyl chain from Ce to C22 or an alkylbenzene chain from Ce to C28, and where n + m is from 6 to 10 and n is from 0 to 10. Throughout of this description n and refer to the average degree of ethoxylation / propoxylation.The preferred R chains for use herein are the alkyl chains of Ce to C22 - Accordingly, the hydrophilic nonionic surfactants suitable for use herein are Dobanol® 23-6.5 (HLB = 11.9; R is a mixture of C12 to C13 alkyl chains n is 6.5 and n is 0), or Dobanol 25-7 (HLB = 12; R is a mixture of C12 alkyl chains a Cis, n is 7 and m is 0), or ÜobanolR 45-7 (HLB = 11.6, R is a mixture of C14 to C15 alkyl chains, n is 7 and is 0), or DobanolR 91-5 (HLB = ll. F > R is a mixture of alkyl chains from C9 to Cu, n is 5 and rn is 0) or urobanol R 91-6 (HLB-12.5; R s is a mixture of alkyl chains from C9 to Cu, n is 6 and is 0 ), or Dobanol 91-8 (HLB = 13.7, R is a mixture of alkyl chains from C9 to Cu, n is 8 and rn is 0), or Dobanol 91-10 (HLB = 14.2; R is a mixture of chains of alkyl from Cg to Cu, n is 10 and in is 0), or mixtures thereof. Preferred herein are Dobanol "91-10 or Dobanol® 45-7, Dobanol 23-6.5, or mixtures thereof, these Dobanol® surfactants are commercially available from SHELL, in addition to non-ionic hydrophilic surfactants. Adornas or other hydrophilic surfactants may be used in the emulsions of the present invention such as ammonium-active agents described below.The emulsions according to the present invention may further comprise other surfactants which however should not significantly alter the average weight HLB value of the overall emulsion In a preferred embodiment of the emulsions of the present invention, wherein the emulsions comprise acetyl citrate citrate as the bleach activator, a non-active surfactant system suitable ionic would comprise a non-ionic hydrophobic surfactant with for example an HLB of 6, such as Dobanol 32-2 and an agent nonionic hydrophilic surfactant with for example an HLB of 15, such as? n Do anolR 91-10. Suitable non-ionic surfactant systems comprise for example Dobanol 23-6.5 (HLB of about 12) and a Dobanol® 23 (HLB less than 6) or a Dobanol "45-7 (HLB = 11.6) and Lutensol T03 (HLB = 8) "In the embodiment of the present invention wherein the peroxygen bleach-containing compositions of the present invention comprise said bleach activator and are formulated as microemulsions, said heterozygotes containing peroxygen bleach in accordance with the present invention comprise a hydrophilic surfactant system comprising an anionic surfactant and a nonionic surfactant A key factor in order to stably incorporate the hydrophobic activator is that at least one of said surfactants must have a different HLB value than that In fact, if all the surfactants had the same HLB value as that of the hydrophobic activator, of this A single continuous phase could be formed by decreasing the chemical stability of the bleach / bleach activator system. Preferably, at least one of said surfactants has a HLB value that differs by at least 1.0 unit of HLB, preferably 2.0 from that of said bleach activator. Suitable anionic surfactants herein include water-soluble salts of the formula ROSO3M wherein R is preferably C? Or C C hidrocar hydrocarbon, preferably an alkyl or hydroxylaryl which is an alkyl component. of C10-C20most preferred is C12-C18 alkyl or hydroxyalkyl, and M is H or a cation, for example, an alkali metal cation (eg, sodium, potassium, lithium), or substituted ammonium or ammonium (e.g. , rnethyl-, dimethyl- and trimethyl ammonium cations and quaternary arnome cations, such as tetramethyl-ammonium cations and dimethyl-11-piperdinium and quaternary ammonium cations derived from alkylated inas such as ethylene, dietene, triethylamine, and mixtures thereof, and the like). Typically, the C12-I6 alkyl chains are preferred for their lower wash temperatures (eg, less than about 50 ° C) and the C1-6 alkyl chains are preferred for their higher wash temperatures (eg. for example, about 50 ° C). Other suitable ammonium surfactants for use herein are the water soluble salts or acids of the formula R0 (A) mS03M wherein R is an unsubstituted C10-24 alkyl or hydroxyalkyl group having an alkyl component of C10-C24,? Refer *? The alkyl or C12-C20 hydroxyalkyl, very preferred alkyl or hydroxyalkyl of C12-C18, A is an ethoxy or propoxy unit, is greater than zero, typically between about 0.5 and about 6, preferably between about 0.5 and about 3, and M is H or a cation which may be, for example, a metal cation (eg, sodium, potassium, lithium, calcium, magnesium, etc.), ammonium cation or substituted ammonium. Ethoxylated fats as well as propoxylated alkylsulphates are contemplated in the present case. Specific examples of substituted ammonium cations include cations of ethyl-, dimethyl-, methyl- and substituted ammonium, such as ferrum-ammonium, dimethyl-11-piperdinium and cations derived from alkanolarnins such as ethylane, diethylamine, triethyanine, mixtures of them, and similar. Exemplary surfactants are alkyl sulfuric acid (1.0) of C12-C18 / E (1.0) M of C12-C-I8, alkyl sulfate polyethoxylated (2.25) of C12-C18, E (2.25) M of C12-C18, alkylsulfate olyethoxy side (3.0) of C1-C18, E (3.0) of C12-Cie, to q? ilsul ato polietox 11 ado (4.0) of C12-C18, E (4.0) M of Ci2 ~ Ci8 ^ wherein M is conveniently selected from sodium and potassium. Other ammonium surfactants useful for detersive purposes can also be used herein. These may include salts (including, for example, salts of sodium, potassium, ammonium and substituted ammonium such as salts of ono-, di- and p-ethanol amine) of soap, alkoxy benzenesul linear phonates of C9-C20, alkanesulphonates primary and secondary C8-C2, C8-C24 olefmsulfonates, sulfonated polycarboxylic acids prepared by removing the pyrolyzed product of alkali metal citrate, for example, as described in British Patent Specification No No. 1,082,179, C8-C24 alkylpolycoletersulfates (which contain up to 10 moles of cellulose oxide); alkyl ethers * sulfonates such as sulfuric esters of Ci ^ -ie; acryl-1-yl ether sulfonates, oleyl glycerol sulfates, alkyl phenol ether sulfates of ethylene oxide, paraffin sulfonates, alkyl phosphates, isoethionates such as acyl isethionates, N-taurates, alkyl succinates and sulphonates, sulphosuccinate monomers (especially rnonoesters) of C12-saturated and more saturated acids) sulfosuccinate di-esters (especially C6-C14 saturated and saturated 1-diesters), alkyl poly saccharides sulfates such as sulphates alkyl polyglucoside (the non-sulphonated nonionic compounds described below), to which branched primary isulfates, alkyl polyethoxy carboxylates such as those of the formula ROCH2 H2? CH2COO- * - wherein R is a C 1 -C 22 alkyl, is an integer from 0 to 10, and M is a soluble salt forming cation. The ream acids and hydrogenated ream acids are also suitable, such as hydrogenated rosins, and resin acids and hydrogenated resin acids present in or derived from wood oil. Other examples are given in "Surface Active Agents and Detergent" (VoL.T and IT by Schwartz, Perry and Berch). A variety of such surfactants are generally also described in the US Pat. 3,929,678, issued December 30, 1975 to Laughlin, and others, in column 23, line 58 to column 29, line 23 (incorporated herein by reference). Suitable nonionic surfactants for use in the microemulsions of the present invention include the non-ionic hydrophilic surfactants as defined above. The preferred manufacture of the microe ions ions of the present invention comprising a liquid hydrophobic bleach activator includes prezixing the surfactants with water and subsequently adding the other ingredients including hydrogen peroxide and said hydrophobic bleach activator. Regardless of this preferred order of addition, it is important that «During mixing of 1 The ingredients, the ingredients, are constantly kept under agitation under stirring energies, preferably 30 minutes at 750 rpm, most preferred 30 minutes at 1000 rpm. In the mode of the present invention wherein the compositions are formulated as microemulsions, said compositions are transparent microscopically in the absence of opacifiers and dyes. In the centrifugal examination, it was observed that the present micro-sulfations did not show phase separation after 15 minutes at 6000 rpm. Ba or microscopic examination, said crusons appeared as a scattering of drops in a matrix. The matrix is the hydrophilic matrix described above, and the drops are constituted by the liquid hydrophobic bleach activator. It was observed that the particles had a size that is typically around or less than 3 microns in diameter. Compositions suitable for use in accordance with the present invention may further comprise a suppressor for foams such as 2-alkylene alkanol., or mixtures thereof, as a highly preferred optional ingredient. Suitable in particular for use in the present invention are the 2-alkylene alkanols having an alkyl chain which comprises from 6 to 16 carbon atoms, preferably from R to 12 and a terminal hydroxy group, said alkyl chain being substituted at position a by an alkyl chain comprising from 10 carbon atoms, preferably from 2 to 8 and most preferred from 6. Such suitable compounds are commercially available, for example, in the Isofoil series with Tsofol.RTM. (2-butyl octane) or Isofol 16 (2-hex? L decanol). Typically, compositions suitable for use herein comprise from 0.05% to 2% by weight of the total composition of a 2-l-alkanol, or mixtures thereof, preferably from 0.1% to 1.5% and most preferred from 0.1% to 0.8 %. Although the preferred application of the compositions described herein is the laundry pretreatment, the compositions according to the present invention can also be used as a laundry detergent or as a laundry detergent as well as a household cleaner in the bathroom or in the kitchen. When used as hard surface cleaners, such compositions are easy to rinse and provide good glossy surfaces on clean surfaces. The present invention will be further illustrated by the following examples.

A) EXPERIMENTAL DATA The following compositions were made by mixing the ingredients listed in the listed proportions (% by weight unless otherwise specified).

Compositions I II III IV V VI Alquilsu: L fato 1.2 1.2 1.2 1.2 1.2 1.2 DobanolR 91- - 10 1.6 1.6 1.6 1.6 1.6 1.6 Dobanol 23.. 3 1.1 1.1 1.1 1.1 1.1 1.1 H2O2 7.0 7.0 7.0 7.0 7.0 7.0 BHT 0.03 0.03 0.03 0.03 0.03 0.03 Perfume 0.1 0.1 0.1 0.1 0.1 0.1 S, S-EDDS 0.5 - DTPMP 0.5 - MGDA 0.5 DTPA - 0.5 HEDP 0.5 H2S04 up to pH 4 Loss of tensile strength 60 0 0 2 4 0 50 ppm copper per gram of cloth 24-hour pretreatment S, S EDDS is ethylene diamine N, N'-disuccinic acid (S, S isomer).

DTPMP is diethylene tria in penta methylene phosphonate manufactured by Moneanto under the trademark DEQUEST. MGDA is methyl glycine di-acetic acid. PDTA is tetracyclic propylene diarynin acid manufactured by BASF under the trademark Trilon FSR. Composition I comprises only hydrogen peroxide and is free of copper and / or iron and / or manganese chelating compounds. Compositions II to VI are representative of the present invention, comprise hydrogen peroxide and a copper and / or iron and / or manganese chelating compound.

The following test was carried out: A tensile strength test method was carried out with the compositions mentioned above. You did test method was carried out on metal contaminated fabrics. Cotton tapes (size 12.5 x 5 crn2) having a copper concentration of 50 pprn per gram of cotton were pretreated according to the present invention. In fact, the cotton tapes were pretreated with 7 ml of each liquid composition mentioned above. The compositions were left in contact with the tapes for 24 hours, before rinsing with water. After that, the damage on the fabrics, ie, cotton tapes, was evaluated by stretching said tapes until they broke. The force required to break the tapes was measured, ie the Essential Tension Resistance, in wet conditions, with "The Stress-St rain TNSTRON Machine". As the force needed to break these tapes was reduced, the damage caused to the fabrics was more serious. Good safety (normal deviation 16 - 2 5 Kg) in the results is obtained using five replicates for each pi * test "The aforementioned tensile strength loss for the different tested compositions is expressed as a percentage and is obtained by comparing the tensile strength of a cloth given as a reference, that is, a non-pretreated fabric, with the tensile strength of the same fabric measured after pre-treating said fabric as mentioned before. The above results clearly show * - the unexpected safety improvement, that is, the reduction of the loss of tensile strength, obtained by using liquid compositions according to the present invention which comprise? N peroxygen bleach and a copper chelating compound. and / or iron and / or manganese, in comparison with the use of the same compositions but without a copper and / or iron and / or manganese chelating compound (composition T) "In fact, no loss of tensile strength when fabrics with compositions according to the present invention were pretreated (see compositions TI to VI), this still in a long contact period, that is, 24 hours and in the presence of a high concentration of copper on the surface of said fabrics, that is, 50 ppm per gram of cotton cloth. 17 B) EXAMPLES The following compositions were made by mixing the ingredients listed in the listed proportions (Z by weight unless otherwise specified).

Compositions I TI TU IV V VI VII VTII H202 7.0 7.0 7.0 7.0 7.0 7.0 7.0 7.0 Alkyl sulfate (1) 1.2 1.2 1.2 1.2 1.2 1.2 1.2 1.2 D? Banol R 91-10 1.6 1.6 1.6 1.6 1.6 1.6 1.6 L.6 DobanolR 23-3 1.1 l.l 1.1 1.1 1.1 1.1 1.1 1"1 BHT 0.03 0.03 0.03 0.03 --- --- 0.09 0.09 2-Butyl octane 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 S, S EDDS 0.5 --- --- --- --- --- --- pDT 0.5 --- --- --- - - --- --- DTPMP - 0.5 --- 0.18 --- MGDA 0.5 HPNO --- 0.1 --- HEDP - - --- 0.10 --- DTPA --- - - --- --- 0.1 Water and minors (coloring) up to 100% H2 O4 up to pH of 4 S, S EDDS is et? Lend? N? N n-N, N '-disuccinic acid (S, S isomer). ÜTPMP is diethylene triamine penta methylene phosphonate manufactured by Monsanto under the trademark DEQUESTR.

MGDA is rnetyl glycine di-acetic acid. POTA Acid propilon diarnin te + rac + o. HPNO is 2-h? Drox? ?? ri di n-N-ox gone HEDP is hydroxy-ethane diphosphonic acid. 5 DTPA is diethylene tpam penta acetic acid.

Compositions IX X XI XTT xtti H2O2 7.0 7.0 7.0 4.0 6.0 Alkyl ul fato (1) 1.2 1.2 1.2 2.0 LO AFS 25 ~ 3 i? . p DobanoJR 45-7 .. _. - 6.4 6.0 DobanolR 91-10 1.6 1.6 1.6 Dobanol 23-3 1.1 1.1 1.1 8.6 DobanolR 23-6.5 6.0 Ib Activator (ATC) 3.5 3.5 BHT 0.03 0.03 0.03 0.05 S, S EDDS or PDTA 0.1 DTPMP 0.1 - or HEDP 0.1 0.1 Dipicoli acid 0.05 0.05 0.05 Water and nores up to 100% - The compositions in Examples I to XIII are of ? F according to the present invention. A pretreatment process according to the present invention was carried out with the compositions I to XIII in reality without loss of tensile strength of the tied fabrics, even when the compositions were left to act on said fabrics for 74 hours before of washing said fabrics.

Claims (24)

NOVELTY OF THE INVENTION CLAIMS

1. - The use of a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelator compound, for pretreating * a dirty fabric before washing said fabric, wherein the loss of strength is reduced to the tension in said tel.

2. A process for pre-cleaning dirty fabrics in a liquid composition comprising an oxygen bleach and a copper and / or iron and / or manganese chelating compound, said method comprising the steps of applying said composition in its pure form on the fabric and allowing said composition to remain in contact with said fabric without allowing the composition to dry on said fabrics, before washing * d cha t la.

3. The use according to claim 1, further characterized in that said copper and / or iron and / or manganese chelator compound is selected from the group consisting of phosphonate chelating agents, carotylate chelating agents, polyfunctionally substituted aromatic chelating agents, polydicarboxylic acids, a chelating agent having two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions to form complexes with netions in which each metal It is formed in complex by 3 chelating agents. and mixtures thereof.

4. The use according to claim 1, further characterized in that said copper and / or iron and / or manganese chelator compound is ethylene diamine N, N'-discyclic acid, or alkali metal salts, loyal mole, ammonium or substituted ammonium, or diethylene tnamin penta acetic acid, or rnetii acid and acrylic acid or diethylene triazine penta ethylene phosphonic acid, or hydroxy-ethane diphosphonic acid or tetracyclic propylene diarynnic acid, or 2 ~ H? drox? p? r? d? n? -Mix? o, or ethylendin tplotert rachis N, N-oxide of methylene phosphonic acid, or mixtures thereof.

5. The use according to claim 1, further characterized in that said liquid composition comprises from about 0.005% to about 2% by weight of the total composition of said copper and / or iron chelating compound and / or manganese, or mixtures of the same.

6. The use according to claim 1, further characterized in that said peroxygen bleach is hydrogen peroxide or a water soluble source thereof, preferably hydrogen peroxide.

7. The use according to claim 1, further characterized in that said composition comprises from about 0.5% to about 20% by weight of the total composition of said peroxygen bleach or mixtures thereof.

8. The use according to claim 1, further characterized in that said composition comprises a surfactant agent up to a level of approximately 50% by weight of the total composition. 9.- A procedure in accordance with the claim 2, further characterized in that said chelated copper and / or iron and / or manganese compound is selected from the group consisting of phosphonate chelating agents, carotenoid chelating agents or brassic, aromatic chelating agents. They are substituted, polycarboxylic acids of pyrid a, a chelating agent that has two electron donor groups capable of occupying adjacent coordination sites in the sphere of coordination metal ions to form complexes with metal ions where each metal is formed in complex by 3 chelating agents. and mixtures of the same. 10. A process according to claim 2, further characterized in that said copper and / or iron and / or manganese chelating compound is ethylenitrin N, N'-disuccinic acid, or metal salts. non-ferrous lime, ammonium or substituted ammonium, or diethylene tparnin penta acetic acid, or methyl glycine di-acetic acid or diethylene triaryl penta methylene phosphonic acidor hydroxy-ethane diphosphonic acid or propylene diaclen tetraetic acid, or 2-hydroxypyridm-N-oxide, or ethylene glycol tetrachloride N, N-? xed methylene phosphonic acid, or mixtures thereof. 11. A method according to claim 2, further characterized in that said liquid composition comprises from about 0.005% to about 7% by weight of the total composition of said copper and / or iron and / or manganese chelating compound, or mixtures thereof. 12. A process according to claim 2, further characterized in that said peroxygen-bleach is hydrogen peroxide or a water-soluble source thereof, preferably hydrogen peroxide. 13. A process according to the rei indication 2, characterized u em s because said composition comprises from about 0.5% to about 20% by weight of the total composition of said peroxygen bleach or mixtures thereof. 14. A process according to claim 2, further characterized in that said composition comprises a surfactant up to a level of approximately 50% by weight of the total composition. 15. A liquid detergent composition comprising a peroxygen bleach and, as a copper and / or iron and / or manganese chelator compound, rnet acid 11 giicín d? -acot? Co, propylene diaryn tetracetic acid, 2-h? drox ?? r? d? n-N-oxide, etilendimt r'i loter't raquis N, N'oxid of methyl-lysphosphonic acid, hydroxy-ethane diphosphonic acid or mixtures thereof. 16. A composition according to claim 15, further characterized in that said peroxygen bleach is a hydrogen peroxide or a water soluble source thereof, preferably hydrogen peroxide, and wherein said composition comprises from about from 0.5% to about 20% by weight of the total composition of said peroxygen bleach. 17. A composition according to claim 16, further characterized in that said composition comprises from about 2% to about 15% by weight of the total composition of said peroxygen bleach. 18. A composition according to claim 15, further characterized in that said liquid composition comprises from about 0.005% to about 2% by weight of the total composition of said copper and / or iron and / or manganese chelating compound or mixtures thereof. 1

9. A composition according to claim 18, further characterized in that said liquid composition comprises from about 0.01% to about 1% by weight of the total composition of said chelator compound copper and / or iron and / or manganese or mixtures thereof. 20. A composition according to claim 15, further characterized in that said composition is aqueous and has a pH of about 1 to about 9. 21. A composition according to claim 20, further characterized in that said composition has a pH of about 2 to about 6. 22. A composition according to claim 15, further characterized in that said composition comprises a surfactant, or mixture thereof, up to a level of 50% by weight of the total composition , preferably a nonionic surfactant or mixtures thereof and / or ammonium surfactant or mixtures thereof. 23. The use of a liquid composition comprising a peroxygen bleach and a copper and / or iron and / or manganese chelator compound, to pretreat a dirty-colored fabric before washing said fabric, wherein the damage is reduced of color of said fabric. 24.- The use of a chelating agent that has two electron donor groups capable of occupying adjacent coordination sites in the sphere of metal ions to form complexes with metal ions where each metal ion is complexed by 3 chelating agents and / or of the Lendinitplotertraquis N, N-oxido of methylene phosphonic acid and / or of hydroxy-ethane diphosphonic acid, in a liquid acid composition comprising a peroxygen bleach, wherein the chemical stability of said composition is improved.