EP1084224B1 - Aqueous bleaching agent with viscose structure - Google Patents

Abstract

The invention aims at solving the problem of hydrogen peroxide wastage when the agent is poured on dirty textiles and the increased oxidative load on the textile when pretreatment agents containing peroxide are used in an aqueous bleaching agent serving as laundry pretreatment agent. This is substantially achieved by an agent containing 0.2 to 25 % by weight of hydrogen peroxide, complexing agents for heavy metals in a quantity of up to 5 % by weight, surfactants in a quantity of up to 15 % by weight, free-radical scavengers in a quantity of up to 0.1 % by weight and water in quantities ranging from 55 to 90 % by weight and a polysaccharide thickening active substance in quantities such that the substance has a viscosity in the range of from 200 mPa.s to 5,000 mPa.s at 20 DEG C and at rpm 20 (Brookfield rotational viscometer) and a viscosity at rpm 5 (Brookfield rotational viscometer) that is at least 1.5 higher than at rpm 50.

Description

The present invention relates to an aqueous bleaching agent based on hydrogen peroxide, especially for use as laundry pretreatment agents, but also as Additive in conventional washing processes is suitable for its use as Laundry pretreatment agent and a washing method using such Agent.

To remove stubborn stains from textiles these are often with special before the actual washing process Pretreatment agents treated. So far this is the problem of removal bleachable stains are usually peroxide-containing Pretreatment agent for use. Because of the then relieved Such pretreatment agents are normally liquid and use conditions are poured onto the stain directly or, if necessary, after dilution with water. Due to the intensive and longer exposure time of the peroxide-containing agent, a improved removal of the bleachable stains from the textile when this is achieved Textile then subjected to a household washing process, in addition to machine washing processes, so-called hand washing can also be used can.

Common liquid peroxide-containing pretreatment agents are relatively low-viscosity means that they generally have viscosities not exceeding 200 mPa.s. They contain alongside the peroxide is usually water and surfactants, which improve wettability the stains should apply when applying the agent. Due to the high network effect and the low viscosity of the agent causes the product to run badly on the treated textile, so that even with careful application of the agent in all Usually a much larger area than the actual stain is wetted. this leads to that part of the peroxide applied to the textile does not bleach the Soiling is available, but is wasted, so to speak, because it is not in appropriate direct contact with the stain. Another problem arises when drying the aqueous pretreatment agent on the textile in that the Evaporation of the water intensifies at the edges of the liquid, causing it to in the sense of a chromatography effect on concentration gradients Liquid ingredients come. As a result, one finds in the edge zone of the liquid Concentration of liquid ingredients instead. Even from the textile surface Originating substances, such as heavy metal ions, migrate to the Edge of the wetted surface and occur there in a relatively high concentration. this leads to increased heavy metal-catalyzed hydrogen peroxide decomposition in the edge area the wetted surface and thus to an increased oxidative load on the textile fibers in this area, which results in permanent changes in color perception Can express damage to the textile.

In international patent application WO 96/26999 it is proposed to counter this problem by using chelating agents for iron, copper or manganese, whereas in European patent application EP 0 751 214 the use of certain polyamines is recommended to avoid damage to color and / or fibers becomes. Both do not lead to a completely satisfactory solution in all cases.

Surprisingly, it has now been found that both the problem of wasting Hydrogen peroxide as well as the increased oxidative stress on the textile due to the Use of peroxide-containing pretreatment agents can be solved with the help a special thickening agent has been adjusted to an increased viscosity and have a certain structural viscosity, i.e. a non-Newtonian Have flow behavior.

Structural viscosity is understood here to mean the effect that the liquid agent has a higher viscosity when exposed to low shear forces than when applied higher shear forces. The change in viscosity is usually not directly proportional the change in acting shear forces, but the viscosity increases with decreases in shear force in the low shear range more than in the high Shear area. This property can be checked experimentally by: measures viscosity under various shear conditions. One way to do this offers a common rotary viscometer at different speeds the spindle.

The invention relates to a liquid water-based bleaching or Laundry pretreatment agent containing 0.2% by weight to 25% by weight of hydrogen peroxide, Complexing agent for heavy metals in an amount up to 5 wt .-%, surfactant in one Amount up to 15% by weight, radical scavengers in an amount up to 0.1% by weight and water in amounts of 55% by weight to 90% by weight and as much polysaccharide thickening agent, that it was at 20 ° C at 20 revolutions per minute (Brookfield Rotational viscometer) a viscosity in the range of 200 mPa.s to 5000 mPa.s, in particular 300 mPa.s to 3000 mPa.s and at 5 revolutions per minute (Brookfield Rotational viscometer) at least by a factor of 1.5, in particular 2 to 50 and particularly preferably 2.5 to 30 higher viscosity than at 50 revolutions per Minute.

Several measurements are necessary to determine the intrinsic viscosity, whereby one when using conventional Brookfield rotary viscometers, usually not the can measure the entire viscosity range with the help of the same spindle, but the one for uses the spindle specified in the respective measuring range.

The agents according to the invention contain hydrogen peroxide as an essential constituent, which is responsible for the bleaching performance, in amounts of preferably 0.5% by weight up to 20% by weight, in particular 2% by weight to 10% by weight. For the production of such agents can also be assumed from more concentrated hydrogen peroxide.

A polysaccharide thickening agent is an optionally modified one Polymer from saccharides such as glucose, galactose, mannose, gulose, old rose, allose etc. into consideration. A water-soluble xanthan is preferred, as described, for example, under the product names Kelzan®, Rhodopol®, Ketrol® or Rheozan® are commercially available is used. Xanthan is a polysaccharide that corresponds to that of the bacterial strain Xanthomas campestris from aqueous solutions is produced by glucose or starch (J. Biochem. Micobiol. Technol. Engineer. Vol. III (1961), pp. 51 to 63). It consists essentially of glucose, mannose, glucuronic acid and their acetylation products and also contains minor amounts chemically bound pyruvic acid. The use of water-soluble polysaccharide derivatives, such as, for example, by oxyalkylation with, for example, ethylene oxide or propylene oxide and / or butylene oxide, by alkylation with, for example, methyl halides and / or Dimethyl sulfate, by acylation with carboxylic acid halides or by saponification Deacetylation can be obtained is possible. The polysaccharide thickening agent is preferably in amounts of Contain 0.05 wt .-% to 2.5 wt .-%, in particular 0.1 wt .-% to 2 wt .-%. He wears crucial not only to the viscosity, but also to the intrinsic viscosity of the invention Means at. It is particularly advantageous that when using such Thickening agents, especially of xanthan, have a wide viscosity Temperature range from about -5 ° C to 40 ° C changes only slightly and also when leaving of this temperature range there are reversible values in the viscosity range mentioned above adjust when the medium is brought back to room temperature.

Agents according to the invention contain one or more surfactants in amounts of preferably 0.1% by weight to 9% by weight, anionic surfactants, nonionic surfactants and mixtures thereof being particularly suitable. Suitable anionic surfactants are, in particular, those which contain sulfate or sulfonate groups. Preferred surfactants of the sulfonate type are C ₉ -C ₁₃ alkylbenzenesulfonates, olefin sulfonates, that is to say mixtures of alkene and hydroxyalkanesulfonates, and also disulfonates of the kind obtained, for example, from C ₁₂ -C ₁₈ monoolefins having an end or internal double bond by sulfonating Gaseous sulfur trioxide and subsequent alkaline or acidic hydrolysis of the sulfonation products. Also suitable are alkanesulfonates obtained from C ₁₂ -C ₁₈ alkanes, for example by sulfochlorination or sulfoxidation with subsequent hydrolysis or neutralization. Also suitable are the esters of α-sulfofatty acids (ester sulfonates), for example the α-sulfonated methyl esters of hydrogenated coconut, palm kernel or tallow fatty acids, which are produced by α-sulfonation of the methyl esters of fatty acids of vegetable and / or animal origin with 8 to 20 ° C -Atoms in the fatty acid molecule and subsequent neutralization to water-soluble mono-salts are considered. These are preferably the α-sulfonated esters of hydrogenated coconut, palm, palm kernel or tallow fatty acids, with sulfonation products of unsaturated fatty acids, for example oleic acid, in small amounts, preferably in amounts not above about 2 to 3% by weight. %, can be present. In particular, α-sulfofatty acid alkyl esters are preferred which have an alkyl chain with no more than 4 carbon atoms in the ester group, for example methyl esters, ethyl esters, propyl esters and butyl esters. In addition to the methyl esters of α-sulfofatty acids (MES), their saponified disalts can also be used. Other suitable anionic surfactants are sulfonated fatty acid glycerol esters, which are mono-, di- and triesters as well as their mixtures, such as those produced by esterification by a monoglycerol with 1 to 3 moles of fatty acid or in the transesterification of triglycerides with 0.3 to 2 moles of glycerol be preserved. The alk (en) yl sulfates are the alkali and in particular the sodium salts of the sulfuric acid half esters of C ₁₂ -C ₁₈ fatty alcohols, for example from coconut fatty alcohol, tallow fatty alcohol, lauryl, myristyl, cetyl or stearyl alcohol or the C ₁₀ -C ₂₀ oxo alcohols and those half esters of secondary alcohols of this chain length are preferred. Also preferred are alk (en) yl sulfates of the chain length mentioned, which contain a synthetic, petrochemical-based straight-chain alkyl radical which have a degradation behavior analogous to that of the adequate compounds based on oleochemical raw materials. C ₁₂ -C ₁₆ alkyl sulfates and C ₁₂ -C ₁₅ alkyl sulfates and C ₁₄ -C ₁₅ alkyl sulfates are particularly preferred from the point of view of washing technology. 2,3-Alkyl sulfates, which are produced, for example, according to US Pat. Nos. 3,234,258 or 5,075,041 and can be obtained as commercial products from Shell Oil Company under the name DAN®, are also suitable anionic surfactants. Also suitable are the sulfuric acid monoesters of the straight-chain or branched C ₇ -C ₂₁ alcohols ethoxylated with 1 to 6 mol ethylene oxide, such as 2-methyl branched C ₉ -C ₁₁ alcohols with an average of 3.5 mol ethylene oxide (EO) or C ₁₂ - C ₁₈ fatty alcohols with 1 to 4 EO. Fatty acid derivatives of amino acids, for example of N-methyl taurine (taurides) and / or of N-methyl glycine (sarcosides) are suitable as further anionic surfactants. The sarcosides or sarcosinates, and in particular sarcosinates of higher and optionally mono- or polyunsaturated fatty acids such as oleyl sarcosinate, are particularly preferred. The anionic surfactants can be in the form of their sodium, potassium or ammonium salts and also as soluble salts of organic bases, such as mono-, di- or triethanolamine. The anionic surfactants are preferably in the form of their sodium or potassium salts, in particular in the form of the sodium salts.

The nonionic surfactants used are preferably alkoxylated, advantageously ethoxylated, in particular primary alcohols having preferably 8 to 18 carbon atoms and an average of 1 to 12 moles of ethylene oxide (EO) per mole of alcohol, in which the alcohol radical can be linear or preferably methyl-branched in the 2-position or can contain linear and methyl-branched radicals in the mixture, as are usually present in oxo alcohol radicals. In particular, however, alcohol ethoxylates with linear residues from alcohols of native origin with 12 to 18 carbon atoms. eg from coconut, palm, tallow or oleyl alcohol, and an average of 2 to 8 EO per mole of alcohol preferred. The preferred ethoxylated alcohols include, for example, C ₁₂ -C ₁₄ alcohols with 3 EO or 4 EO, C ₉ -C ₁₁ alcohols with 7 EO, C ₁₃ -C ₁₅ alcohols with 3 EO, 5 EO, 7 EO or 8 EO, C ₁₂ -C ₁₈ alcohols with 3 EO, 5 EO or 7 EO and mixtures thereof, such as mixtures of C ₁₂ -C ₁₄ alcohol with 3 EO and C ₁₂ -C ₁₈ alcohol with 7 EO. The degrees of ethoxylation given represent statistical averages, which can be an integer or a fraction for a specific product. Preferred alcohol ethoxylates have a narrow homolog distribution (narrow range ethoxylates, NRE). The nonionic surfactants also include alkyl glycosides of the general formula RO (G) _x , in which R is a primary straight-chain or methyl-branched, in particular methyl-branched aliphatic radical having 8 to 22, preferably 12 to 18, carbon atoms and G stands for a glycose unit with 5 or 6 carbon atoms, preferably for glucose. The degree of oligomerization x, which indicates the distribution of monoglycosides and oligoglycosides, is an arbitrary number - which, as an analytically determinable variable, can also take fractional values - between 1 and 10; x is preferably 1.2 to 1.4. Also suitable are polyhydroxy fatty acid amides of the formula (I) in which R ³ CO is an aliphatic acyl radical having 6 to 22 carbon atoms, R ^{4 is} hydrogen, an alkyl or hydroxyalkyl radical having 1 to 4 carbon atoms and [Z] is a linear or branched polyhydroxyalkyl radical with 3 to 10 carbon atoms and 3 to 10 hydroxyl groups:

in der R³ für einen linearen oder verzweigten Alkyl- oder Alkenylrest mit 7 bis 12 Kohlenstoffatomen, R⁵ für einen linearen, verzweigten oder cyclischen Alkylenrest oder einen Arylenrest mit 2 bis 8 Kohlenstoffatomen und R⁶ für einen linearen, verzweigten oder cyclischen Alkylrest oder einen Arylrest oder einen Oxy-Alkylrest mit 1 bis 8 Kohlenstoffatomen steht, wobei C₁-C₄-Alkyl- oder Phenylreste bevorzugt sind, und [Z] für einen linearen Polyhydroxyalkylrest, dessen Alkylkette mit mindestens zwei Hydroxylgruppen substituiert ist, oder alkoxylierte, vorzugsweise ethoxylierte oder propoxylierte Derivate dieses Restes steht. [Z] wird auch hier vorzugsweise durch reduktive Aminierung eines Zuckers wie Glucose, Fructose, Maltose, Lactose, Galactose, Mannose oder Xylose erhalten. Die N-Alkoxy- oder N-Aryloxy-substituierten Verbindungen können dann beispielsweise nach der Lehre der internationalen Patentanmeldung WO 95/07331 durch Umsetzung mit Fettsäuremethylestern in Gegenwart eines Alkoxids als Katalysator in die gewünschten Polyhydroxyfettsäureamide überführt werden. Eine weitere Klasse bevorzugt eingesetzter nichtionischer Tenside, die entweder als alleiniges nichtionisches Tensid oder in Kombination mit anderen nichtionischen Tensiden, insbesondere zusammen mit alkoxylierten Fettalkoholen und/oder Alkylglykosiden, eingesetzt werden, sind alkoxylierte, vorzugsweise ethoxylierte oder ethoxylierte und propoxylierte Fettsäurealkylester, vorzugsweise mit 1 bis 4 Kohlenstoffatomen in der Alkylkette, insbesondere Fettsäuremethylester, wie sie beispielsweise in der japanischen Patentanmeldung JP 58/217598 beschrieben sind oder die vorzugsweise nach dem in der internationalen Patentanmeldung WO 90/13533 beschriebenen Verfahren hergestellt werden. Auch nichtionische Tenside vom Typ der Aminoxide, beispielsweise N-Kokosalkyl-N,N-dimethylaminoxid und N-Talgalkyl-N,N-dihydroxyethylaminoxid, und der Fettsäurealkanolamide können geeignet sein. Die Menge dieser nichtionischen Tenside beträgt vorzugsweise nicht mehr als die der ethoxylierten Fettalkohole, insbesondere nicht mehr als die Hälfte davon. Als weitere Tenside kommen sogenannte Gemini-Tenside in Betracht. Hierunter werden im allgemeinen solche Verbindungen verstanden, die zwei hydrophile Gruppen pro Molekül besitzen. Diese Gruppen sind in der Regel durch einen sogenannten "Spacer" voneinander getrennt. Dieser Spacer ist in der Regel eine Kohlenstoffkette, die lang genug sein sollte, daß die hydrophilen Gruppen einen ausreichenden Abstand haben, damit sie unabhängig voneinander agieren können. Derartige Tenside zeichnen sich im allgemeinen durch eine ungewöhnlich geringe kritische Micellkonzentration und die Fähigkeit, die Oberflächenspannung des Wassers stark zu reduzieren, aus. In Ausnahmefällen werden unter dem Ausdruck Gemini-Tenside nicht nur derartig "dimere", sondern auch entsprechend "trimere" Tenside verstanden. Geeignete Gemini-Tenside sind beispielsweise sulfatierte Hydroxymischether gemäß der deutschen Patentanmeldung DE 43 21 022 oder Dimeralkohol-bis- und Trimeralkohol-tris-sulfate und -ethersulfate gemäß der deutschen Patentanmeldung DE 195 03 061. Endgruppenverschlossene dimere und trimere Mischether gemäß der deutschen Patentanmeldung DE 195 13 391 zeichnen sich insbesondere durch ihre Bi- und Multifunktionalität aus. So besitzen die genannten endgruppenverschlossenen Tenside gute Netzeigenschaften und sind dabei schaumarm, so daß sie sich insbesondere für den Einsatz in maschinellen Wasch- oder Reinigungsverfahren eignen. Eingesetzt werden können aber auch Gemini-Polyhydroxyfettsäureamide oder Poly-Polyhydroxyfettsäureamide, wie sie in den internationalen Patentanmeldungen WO 95/19953, WO 95/19954 und WO 95/19955 beschrieben werden.The polyhydroxy fatty acid amides are preferably derived from reducing sugars with 5 or 6 carbon atoms, in particular from glucose. The group of polyhydroxy fatty acid amides also includes compounds of the formula (II)

in which R ^{3 represents} a linear or branched alkyl or alkenyl radical having 7 to 12 carbon atoms, R ^{5 represents} a linear, branched or cyclic alkylene radical or an arylene radical having 2 to 8 carbon atoms and R ^{6 represents} a linear, branched or cyclic alkyl radical or Aryl radical or an oxy-alkyl radical having 1 to 8 carbon atoms, C ₁ -C ₄ -alkyl or phenyl radicals being preferred, and [Z] for a linear polyhydroxyalkyl radical whose alkyl chain is substituted by at least two hydroxyl groups, or alkoxylated, preferably ethoxylated or propoxylated derivatives of this radical. [Z] is also preferably obtained here by reductive amination of a sugar such as glucose, fructose, maltose, lactose, galactose, mannose or xylose. The N-alkoxy- or N-aryloxy-substituted compounds can then, for example according to the teaching of international patent application WO 95/07331, be converted into the desired polyhydroxy fatty acid amides by reaction with fatty acid methyl esters in the presence of an alkoxide as catalyst. Another class of preferably used nonionic surfactants, which are used either as the sole nonionic surfactant or in combination with other nonionic surfactants, in particular together with alkoxylated fatty alcohols and / or alkyl glycosides, are alkoxylated, preferably ethoxylated or ethoxylated and propoxylated, fatty acid alkyl esters, preferably with 1 to 4 carbon atoms in the alkyl chain, in particular fatty acid methyl esters, as described, for example, in Japanese patent application JP 58/217598 or which are preferably prepared by the process described in international patent application WO 90/13533. Nonionic surfactants of the amine oxide type, for example N-coconut alkyl-N, N-dimethylamine oxide and N-tallow alkyl-N, N-dihydroxyethylamine oxide, and the fatty acid alkanolamides can also be suitable. The amount of these nonionic surfactants is preferably not more than that of the ethoxylated fatty alcohols, in particular not more than half of them. So-called gemini surfactants can be considered as further surfactants. These are generally understood to mean those compounds which have two hydrophilic groups per molecule. These groups are usually separated from one another by a so-called "spacer". This spacer is usually a carbon chain, which should be long enough that the hydrophilic groups have a sufficient distance so that they can act independently of one another. Such surfactants are generally characterized by an unusually low critical micelle concentration and the ability to greatly reduce the surface tension of the water. In exceptional cases, the term gemini surfactants is understood not only to mean "dimeric" but also "trimeric" surfactants. Suitable gemini surfactants are, for example, sulfated hydroxy mixed ethers according to German patent application DE 43 21 022 or dimer alcohol bis and trimeral alcohol tris sulfates and ether sulfates according to German patent application DE 195 03 061. End group-blocked dimeric and trimeric mixed ethers according to German patent application DE 195 13 391 are particularly characterized by their bi- and multifunctionality. The end-capped surfactants mentioned have good wetting properties and are low-foaming, so that they are particularly suitable for use in machine washing or cleaning processes. Gemini polyhydroxy fatty acid amides or poly polyhydroxy fatty acid amides as described in international patent applications WO 95/19953, WO 95/19954 and WO 95/19955 can also be used.

In a preferred embodiment, an agent according to the invention contains a surfactant system composed of alkyl ether sulfate of the general formula R ¹ O- (CH ₂ CH ₂ O) _n -SO ₃ X, in which R ^{1 is} a linear or branched-chain alkyl or alkenyl radical with 6 to 22 C - Atoms, n is a number from 1 to 10 and X is an alkali metal or ammonium ion, and alkyl polyglycol ethers of the general formula R ² O- (C ₃ H ₆ O) ₁ - (CH ₂ CH ₂ O) _m - (C ₃ H ₆ O) _n -OH, in which R ^{2 is} a linear or branched-chain alkyl or alkenyl radical having 6 to 22 carbon atoms and m is a number from 1 to 10 and 1 and n is a number from 0 to 10, in a weight ratio of 1: 10 to 10: 1, in particular from 2: 1 to 5: 1.

Suitable complexing agents contained in agents according to the invention for Heavy metals include aminocarboxylic acids and optionally functionally modified Phosphonic acids, for example hydroxy or aminoalkanephosphonic acids. To the usable aminocarboxylic acids include, for example, nitrilotriacetic acid, methylglycinediacetic acid and diethylenethamine pentaacetic acid. Among the phosphonic acids come for example 1-hydroxyethane-1,1-diphosphonic acid (HEDP) respectively the disodium salt or the tetrasodium salt of this acid, ethylenediamine-tetramethylenephosphonic acid (EDTMP), diethylenetriamine-pentamethylenephosphonic acid (DTPMP) as well as their higher homologues in question. Also the nitrogenous ones mentioned Compounds corresponding to N-oxides can be used. Among the usable ones Complexing agents also include ethylenediamine-N, N'-disuccinic acid (EDDS). The one in her Complexing agents called acid form can be used as such or in the form of the sodium salts be used. Mixtures of aminocarboxylic acids are preferred with phosphonic acids. Complexing agents for heavy metals are in agents according to the invention preferably contained in amounts of 0.05% by weight to 1% by weight.

Among the known ingredients effective as radical scavengers, which are in the invention Agents are preferably contained in amounts of 0.01% by weight to 0.1% by weight, include phenols such as 1,6-di-tert-butyl-4-methylphenol (butylated hydroxytoluene, BHT), Hydroquinones such as di-tert-butyl hydroquinone, catechols such as allyl catechol, alkylated Diphenylamine or N-phenyl-α-naphthylamine and dihydroquinolines. As a preferred Radical scavenger is used BHT. These are usually poorly water-soluble To be able to incorporate substances rapidly into agents according to the invention, it has proven useful it in the form of a solution in a water-miscible solvent, for example one lower alcohol such as ethanol or isopropanol. It is preferable to them so concentrated that only small amounts of such solvents, in particular at most 0.5% by weight, can be introduced into the agent according to the invention.

Agents according to the invention are preferably acidic and in particular have a pH in the range of 2 to 4. To set a desired one, through the The mixture of the other components of non-self-determined pH can Agents according to the invention acids which are compatible with the system, in particular those mentioned above Aminocarboxylic or phosphonic acids, citric acid, acetic acid, tartaric acid, malic acid, Lactic acid, glycolic acid, succinic acid, glutaric acid and / or adipic acid, but also Mineral acids such as sulfuric acid, phosphoric acid or alkali hydrogen sulfates, or Contain bases, especially ammonium or alkali hydroxides.

In addition to the ingredients mentioned, all agents according to the invention can be used in Liquid detergents contain the usual ingredients with the essential Constituents, especially the hydrogen peroxide and the thickening system, are tolerated. These include, for example, foam regulator active ingredients, color and Fragrances and, if desired, optical brighteners.

Agents according to the invention can be done in a simple manner by simple means Mixing their ingredients can be made. They are homogeneous systems with one high storage stability and good stain removal performance with low textile damage potential. They are preferably contaminated for pretreatment Textiles used before washing. In addition or instead, you can also put them in Form of an additive to a detergent, especially for machine washing of textiles. In a washing process using the inventive Agents are preferably carried out in such a way that a liquid agent according to the invention undiluted on the soiled textile or a part of the soiled textile, the embraces the stain to be removed, applies it, preferably there only so long lets it not dry out, and the textile using water or optionally an aqueous wash liquor which contains a conventional detergent, washes especially using a machine. You can do one further amount of the agent according to the invention the usual detergent and / or add aqueous wash liquor.

Examples

A simple blending of the ingredients in the proportions indicated in the table below produced a liquid bleach-containing laundry pretreatment agent B1 , which was adjusted to a pH of 3 by adding small amounts of phosphoric acid and the viscosity (in mPa. s at 20 ° C). Composition (% by weight) medium B1 hydrogen peroxide 5 ether sulfate 2 nonionic surfactant 0.5 Keltrol® T 0.45 complexing 0.2 BHT 0.03 ethanol 0.2 water to 100 viscosity 910

1 ml or 2 ml of agent B1, depending on the size of the stains, was applied to artificially produced, standardized soiling on cotton fabric, spread with a rubber wiper and allowed to act for 10 minutes. The textile sample treated in this way was then washed together with 2 kg of clean laundry using a commercially available bleach-free mild detergent powder V1 (dosage 68 g) (Miele Novotronic® 918, 1-step process, 40 ° C short program, water hardness 16 ° dH). The reflectance of the tissue samples was measured after drying; The following table shows the color distance value (ΔΔE) from the soiled fabric. For comparison, the values which are obtained without using the agent according to the invention are also given. Color difference values soiling V1 V1 + B1 red wine 3.0 7.4 tea 1.0 8.1 Make up 17.7 30.6

It can be seen that when using the agent according to the invention, significantly more soiling is replaced as with the conventional detergent without previous Use of the agent according to the invention.

Claims (14)

1. A liquid water-containing bleaching or laundry pretreatment composition containing 0.2% by weight to 25% by weight of hydrogen peroxide, heavy metal complexing agents in a quantity of up to 5% by weight, surfactant in a quantity of up to 15% by weight, radical trappers in a quantity of up to 0.1% by weight and water in quantities of 55% by weight to 90% by weight and a polysaccharide thickener in such a quantity that the composition has a viscosity at 20°C/20 r.p.m. (Brookfield rotational viscosimeter) in the range from 200 mPa.s to 5,000 mPa.s and, at 5 r.p.m. (Brookfield rotational viscosimeter), a viscosity higher by a factor of at least 1.5 than at 50 r.p.m.
2. A composition as claimed in claim 1, characterized in that it contains the polysaccharide thickener in a quantity of 0.05% by weight to 2.5% by weight and more particularly in a quantity of 0.1% by weight to 2% by weight.
3. A composition as claimed in claim 1 or 2, characterized in that it contains 1.5% by weight to 20% by weight and more particularly 2% by weight to 10% by weight of hydrogen peroxide.
4. A composition as claimed in any of claims 1 to 3, characterized in that it has a viscosity at 5 r.p.m. higher by a factor of 2 to 50 and more particularly 2.5 to 30 than at 50 r.p.m.
5. A composition as claimed in any of claims 1 to 4, characterized in that the polysaccharide thickener is a xanthan.
6. A composition as claimed in any of claims 1 to 5, characterized in that it contains 0.1% by weight to 9% by weight of surfactant.
7. A composition as claimed in any of claims 1 to 6, characterized in that it contains a surfactant system of alkyl ether sulfate corresponding to the general formula R¹O-(CH₂CH₂O)_n-SO₃X, in which R¹ is a linear or branched alkyl or alkenyl group containing 6 to 22 carbon atoms, n is a number of 1 to 10 and X is an alkali metal or ammonium ion, and alkyl polyglycol ethers corresponding to the general formula R²O-(C₃H₆O)₁-(CH₂CH₂O)_m-(C₃H₆O)_n-OH, in which R² is a linear or branched alkyl or alkenyl group containing 6 to 22 carbon atoms and m is a number of 1 to 10 and I and n are numbers of 0 to 10, in a ratio by weight of 1:10 to 10:1 and more particularly in a ratio by weight of 2:1 to 5:1.
8. A composition as claimed in any of claims 1 to 7, characterized in that it contains 0.05% by weight to 1% by weight of heavy metal complexing agents.
9. A composition as claimed in any of claims 1 to 8, characterized in that it contains 0.01% by weight to 0.1% by weight of radical trappers.
10. A composition as claimed in any of claims 1 to 9, characterized in that it is acidic and, in particular, has a pH value of 2 to 4.
11. The use of the composition claimed in any of claims 1 to 10 for pretreating soiled textiles before washing.
12. The use of the composition claimed in any of claims 1 to 10 as a detergent additive in the washing, particularly machine washing, of textiles.
13. A process for washing textiles, characterized in that the liquid composition claimed in any of claims 1 to 10 is applied without dilution to the soiled textile or to part of the soiled textile and the textile is washed using water or a water-containing wash liquor containing a standard detergent, more particularly in a washing machine.
14. A process as claimed in claim 13, characterized in that the composition claimed in any of claims 1 to 10 is added to the standard detergent and/or to the water-containing wash liquor in addition to the quantity introduced via the textile.