KR920000111B1 - Liquid detergent compositions - Google Patents

Abstract

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Description

Liquid detergent composition

1 is a graph showing the viscosity and stability according to the mixing of the polymer.

The present invention relates to a liquid detergent composition containing the structure formed from the detergent active material. The active structure exists primarily as a separated phase dispersed in an aqueous continuous phase. Such water phases usually contain dissolved electrolytes.

Such structures are well known in the art and can impart the desired flow properties and / or dense appearance properties to the detergent. Many liquids structured with active materials also have the ability to suspend solid particles, such as detergent builders and abrasive particles.

Some of the possible active substance-structured detergents are described in the literature (HA Barnes, 'Deterg ents', ch.2. In K. Walters (Ed), 'Rheometry: Industrial Applications', J. Wiley & Sons, Letchworth 1980) It is announced in. Generally increases as the rules of this system or the concentration of surfactant and / or electrolyte increases. At very low concentrations the surfactant can be present as a molecular solution or as a spherical micelle solution, both of which are homogeneous. Further addition of surfactants and / or electrolytes may form a structured (heterogeneous) system. This is typically called terms such as rod-micelle, planar lamellar structure, lamellar droplets and liquid crystal phase. Often, structures that actually mean the same thing are used by different people in different terms. In European patent specification EP-A-151 884, for example, lamella droplets are called 'spherulite'. The presence and identification of surfactant structuring systems in liquids can be determined by methods well known in the art such as, for example, optical techniques, various flow measurements, X-ray or neutral valence diffraction methods, and sometimes electron microscopy.

One common form of internal surfactant structure is the dispersion of lamella droplets (lamellae dispersion). These droplets have an onion-like structure composed of a condensed surfactant molecule bilayer, and there is water or an electrolyte solution (aqueous phase) surrounded between the surfactant layers. Closed-packed systems of these droplets give a very desirable combination of solid suspension properties including physical stability and useful fluidity.

The electrolyte may be dissolved only in the aqueous continuous phase and may also exist as suspended solid particles. The solid particles insoluble in the water phase may be suspended instead of any electrolyte or may be suspended together with any electrolyte particles.

Three types of products in general form are heavy-duty fabric washing liquids, liquid abrasives and general cleaning agents. The first kind is essentially the same material as the electrolyte in which the suspended solid is dissolved, and the excess electrolyte is suspended above the solubility limit. This solid material usually exists as a cleaning power builder that inhibits the action of calcium ions that cause hardness during cleaning. It is also preferred that insoluble bleach particles such as diperoxydodecanedioic acid (DPDA) are suspended. The second kind is that suspended solids are generally particulate abrasives and do not dissolve in the system. In this case, the electrolyte is a material different from the solid material, which is water soluble and contributes to the structuring of the active material in the dispersed phase. In some cases, however, the abrasive may consist of a partially soluble salt that dissolves upon dilution of the product. The third kind is to use the structure to increase the viscosity of the product in order to give the product the flow characteristics desired by the consumer and often to suspend the pigment particles, the first kind of composition is described in our patent specification EP-A-38101, for example. Described in the heading. Compositions containing suspended DPDA bleaches are described in specification EP-A-160 342. Examples of compositions of the second kind are described in our specification EP-A-104 452. A third class of compositions is described, for example, in US Pat. No. 4,440,840.

In general, two problems arise when formulating liquid solutions containing solids suspended by such systems, in particular lamellar droplets. The first problem is that it is difficult to stand along the product because of its high viscosity, and the second problem is instability, which tends to separate the dispersed phase and the water phase when stored at high or even atmospheric temperatures. Therefore, care must always be taken when formulating such liquids to select the properties and concentrations of the active materials and electrolytes to have the required flow properties.

However, some formulations are not feasible because this composition technique must always balance the flow characteristics and stability necessary as the ideal component in composition. For example, if the total amount of detergent-active substance is to make a concentrated product relatively high compared to other ingredients. The main problem that is usually evident here is that the viscosity is unacceptably high.

One way to control viscosity is to generally formulate the liquid to be shear-thinning. That is, the high viscosity of the product is allowed when left in the container, but the composition is made so that the shear force is above the yield point due to the pouring action so that the product can flow more easily. This property was used in the compositions described in our specification EP-A-38101, supra. Unfortunately, however, it has been found that this property is not readily available in all theoretically possible combinations of ingredients, for example in the preparation of high content of active substances.

It is also known that the incorporation of fabric softening clays (eg bentonite) into liquid solutions results in unacceptably high viscosity. One way to solve this problem is to incorporate a small amount of low molecular weight polyacrylate to dissolve. This is described in British patent specification GB-A-2 168 717. However, if one wants to use such polymers for viscosity control in the widest range of structured liquids, more and more polymers have to be incorporated. Instead of (or in addition to) this reason, it is necessary to use a larger amount of polymer, for example, for the cleaning power builder properties that inhibit the action of calcium, which causes hardness. This is especially important in the case of environmental protection, where a phosphate builder (all or part) is usually replaced by a polymer.

Unfortunately, the use of large amounts of polymers, as well as the incorporation of large amounts of certain components in structured liquids, is a common problem that tends to increase instability. That is, they are separated into two or more different phases.

However, the inventors have found that in the event of such instability, it is possible to expand the amount of polymer that can be stably incorporated by adjusting the composition such that a portion of the polymer is incorporated into the solution into a stable 'insoluble' phase. It was. Accordingly, the present composition provides a liquid detergent composition containing a detergent-active substance-containing structure and a viscosity-reducing polymer dispersed in an aqueous phase including a dissolved electrolyte, and provides a liquid detergent composition in which the polymer is partially dissolved in the electrolyte-containing aqueous phase.

In a preferred embodiment, the composition is at an acceptable level, sometimes with some instability, and is sufficiently stable that phase separation is less than 2% when stored at 25 ° C. for 21 days.

The composition can also incorporate a large amount of polymer without instability, sometimes with slightly higher viscosities, but at acceptable levels, and can achieve low viscosities, preferably viscosities of ¹ PaS or less at shear rates 21S- ¹ .

While not wishing to be bound by any explanation or theory, it is observed that when the present inventors explain this effect, the above described instability starts undesirably quickly, and the viscosity of the polymer-free liquid formulation is increased as more polymer is added. The decrease is due to the fact that there are various conditions that the polymer cannot dissolve rapidly beyond any limit.

The aspect in which the additive polymer is not rapidly dissolved can be described graphically by curve A of FIG. 1. The cut line indicates the onset of instability, after which there is instability. However, all polymer samples do not contain molecules of the same structure and molecular weight, have different molecular spectra depending on the degree of polymerization, and in the case of copolymers, vary according to different component ratios.

In short, the present inventors' theory is due to the adjustment of the conditions of the liquid solution such that one broad category of polymer remains water soluble at much higher concentrations than another. Curve B in FIG. 1 represents a category (different from curve A) that can remain water soluble even at high concentrations under these specific conditions. While those molecules that become insoluble at much lower concentrations are shown as curve C. Curve D shows that the polymer can be incorporated stably. The description is clearly simplified because no polymer sample can be classified under the two broad categories under certain conditions. In practice it will be a continuous category. Nevertheless, this simplified description helps to explain the above-mentioned phenomenon.

The inventors believe that other molecules are in solution (curve B), while insoluble molecules (curve c) are in suspended precipitate phase dispersed in the structured solution. Evidence of this phenomenon can be confirmed by electron microscopy.

The present invention changes the polymer concentration to bring about the effect of the above-described composition, in which instability begins quickly. This means that the amount of polymer which is stably incorporated into the composition according to the present invention is a large amount compared to other reference compositions. At least one parameter of the composition according to the present invention is substantially higher than the maximum polymer amount of the reference composition, i.e., if more than one polymer is dissolved, the polymer amount of the polymer amount is dissolved so that the phase separation of the reference composition becomes 2% or more upon storage at 25 ° C. for 21 days. The parameters of the reference composition have been altered to make it possible.

Parameters that can be modified to provide the effect of dissolving the polymer above the maximum polymer amount of the reference composition are the pH of the composition, the amount or nature of the electrolyte, or the amount or nature of the detergent active material, and other variables.

Viscosity reducing polymers that can be used in the present invention are very broad but are especially selected from polymers and copolymer salts known as washability builders. Polyethyleneglycols, polyacrylates, polymaleates, polysaccharides, polysugarsulfonates and copolymers of foreign substances are used, for example (including wash and build non-build polymers). Preferably the polymer consists of a copolymer containing an alkali metal salt or anhydride of polyacrylic acid, polymethacrylic acid, or maleic acid. It is preferable that the composition containing such a copolymer is pH 8.0 or more. In general, the amount of viscosity reducing polymer used varies widely depending on the composition of the remaining components of the composition. However, typical usage is 0.5-4.5% by weight, in particular 1-3.5% by weight.

In an embodiment of the invention the composition also contains a second polymer which is substantially completely dissolved in the aqueous phase and has an electrolyte resistance of at least 5% sodium nitrilotriacetate in 100 ml of its 5% aqueous solution. The second polymer also has a vapor pressure of 20% aqueous solution equal to or less than the vapor pressure of an aqueous solution of 2% or more polyethylene glycol (average molecular weight 6000) and a molecular weight of 1000 or more. It is also possible to use mixtures of these second polymers.

Incorporation of the second polymer may result in improved stability with the same viscosity as compared with the second polymer-free composition, or a composition having the same stability and low viscosity. The second polymer can also reduce the viscosity upwards and even further reduce the viscosity.

(1) It is especially preferable to incorporate a second polymer when the viscosity reducing polymer has a large amount of insoluble components. The reason is that although the first polymer has a good cleaning ability (since a relatively large amount can be stably incorporated), the decrease in viscosity will not be adequate because the first polymer will hardly dissolve. Therefore, the second polymer may be useful for reducing the viscosity to an ideal level.

The second polymer is preferably incorporated in an amount of 0.05-20% by weight, preferably 0.1-2.5% by weight, in particular 0.2-1.5% by weight of the total composition. In many compositions (but not all, of course) such incorporation can lead to instability. Various different polymers can be used as this second polymer provided that the requirements for electrolyte resistance and vapor pressure are met. The electrolyte resistance is measured as the amount of sodium triacetate (NaNTA) solution with nitrile required to reach a cloud point of 100 ml of a 5% aqueous solution of the polymer at 25 ° C. with the system adjusted to neutral pH (ie pH 7). The electrolyte resistance is preferably 10 g NaNTA, in particular 15 g. Vapor pressure of the second polymer means sufficiently low vapor pressure to have sufficient water binding capacity as described in the specification GB-A-2053249. The measurement of the vapor pressure is preferably carried out using 10% by weight, particularly 18% by weight, aqueous concentrate as the reference solution.

Representative types of polymers used as the second polymer under the premise of satisfying the above requirements include polyethylene glycol, dextran, dextran sulfonate, polyacrylate, and polyacrylate / maleic acid copolymer. Whether a given polymer is partially dissolved or virtually completely dissolved in total depends on the other components, in particular the type and content of the electrolyte.

The second polymer should have an average molecular weight of at least 1000 and a polymer having an average molecular weight of at least 2000 is preferred. Typical average molecular weight ranges that provide good viscosity control are on the order of 1200-30000, particularly 5000-30000.

Detergent active materials can be any materials known in the art used to form structured solutions. Detergent active materials are generally selected from at least one anionic, cationic, nonionic, zwitterionic and amphoteric surfactant. However, particularly preferred detergent actives consist of (a) nonionic surfactants and / or polyalkoxylated anionic surfactants and (b) non-polyalkoxylated anionic surfactants.

In an embodiment, the active material also contains an alkali metal soap of fatty acids (preferably C _12-18 ). Representative of such acids are fatty acids derived from oleic acid, ricinoleic acid, castor oil, rapeseed oil, peanut oil, coconut oil, palm kernel oil or mixtures thereof. Sodium soaps or potassium soaps of these acids can be used, but potassium soaps are preferred.

Materials used as suitable nonionic surfactants are, in particular, compounds of hydrophobic groups and reactive hydrogen atoms (e.g. aliphatic alkyls, acids, amines or alkylphenols) and alkylene oxides (especially ethylene oxide alone or ethylene oxide / propylene oxide). Reaction product. Particularly suitable nonionic surfactants are alkyl (C ₆ -C ₂₂ ) phenol-ethylene oxide condensates, condensation products of aliphatic (C ₈ -C ₁₈ ) primary or secondary linear or branched alcohols with ethylene oxide, propylene oxide and It is the product of the reaction product of ethylenediamine and condensation of ethylene oxide. Other so-called nonionic detergent compounds include long chain tertiary amine oxides, long chain tertiary phosphine oxides and dialkylsulfoxides.

Anionic surfactants are water soluble alkali metal salts of sulfonic acids and organosulfurs, usually with alkyl of about C ₈ -C ₂₂ . The term alkyl is used herein to include the alkyl portion of the higher acyl group. Examples of suitable synthetic anionic detergent compounds include sodium and potassium alkylsulphates and potassium, in particular sodium sulfate and potassium, obtained for example by the sulfation of higher (C ₈ -C ₁₈ ) alcohols produced from tallow or coconut oil; Sodium alkyl (C ₉ -C ₂₀ ) benzenesulfonate and potassium, in particular linear secondary alkyl (C ₁₀ -C ₁₅ ) benzenesulfonate sodium; Alkyl ethers of sodium sulfate, especially those of higher alcohols derived from tallow or coconut oil and synthetic alcohols derived from petroleum; Coconut oil fatty acid monoglyceride sulfuric acid and sodium sulfonate; Sodium and potassium salts of sulfate esters of higher (C ₈ -C ₁₈ ) fatty alcohol-alkylene oxides (especially ethylene oxide); Reaction products obtained by esterifying fatty acids such as coconut fatty acid with isethionic acid and neutralizing with sodium hydroxide; Sodium and potassium salts of fatty acid amides of methyltaurine; Substances induced by the reaction of alpha-olefins (C ₈ -C ₂₀ ) with sodium bisulfite, or substances derived by hydrolysis with base to produce random sulfonates after the reaction of paraffins with SO ₂ and Cl ₂ Alkanono sulfonates such as; Olefinsulfonates, which refer to substances obtained by neutralizing and hydrolyzing the reaction product after the reaction of olefins (especially C ₁₀ -C ₂₀ alpha-olefins) with SO ₃ . Preferred anionic detergent compounds are (C ₁₁ -C ₁₅ ) sodium alkylbenzenesulfonates and (C ₁₆ -C ₁₈ ) sodium alkyl sulfates.

The composition of the present invention preferably contains a detergency builder material. Detergency builder materials are materials which can reduce the amount of free calcium ions in the wash liquor and are preferably other advantages in the composition, such as the formation of alkaline pH, suspension of dirt removed from the fabric, dispersion of fabric softening clay materials and Provides the same advantages. This material is classified as an inorganic, organic non-polymeric, organic polymeric material.

In general, the inorganic builder preferably constitutes part or all of the electrolyte (assuming water solubility). It is also preferred that the liquids contain suspended solids, in particular as part or all of the builder (in this case the builder need not be water soluble). The electrolyte usually accounts for 1-60% by weight of the total composition. In a preferred embodiment, the use of water-insoluble amorphous or crystalline aluminosilicates as the suspended solids material tends to result in high viscosity, which leads to the need to reduce the viscosity by the polymer. As mentioned above, the polymers themselves are often builders and thus form a very useful zero-P builder system with zeolites.

Examples of such phosphorus-containing inorganic detergent builders are water-soluble salts, in particular alkali metal salts of pyrophosphoric acid, orthophosphoric acid, polyphosphoric acid and phosphonic acid. Representative inorganic phosphate builders among them are sodium and potassium tripolyphosphate, sodium and potassium phosphate, sodium hexametaphosphate and potassium.

Examples of the lean inorganic cleaning builders include water-soluble alkali metal salts of carbonic acid, bicarbonate, silicic acid, crystals and amorphous aluminosilicates. Typical examples include sodium carbonate (with or without a calcite seed), potassium carbonate, sodium bicarbonate and potassium, sodium silicate and potassium.

Examples of non-polymeric organic detergent builders include alkali metal, ammonium, substituted ammonium salts of polyacetic acid, carboxylic acid, polycarboxylic acid, polyacetyl carboxylic acid and polyhydroxysulfonic acid. Representative organic builders are sodium, potassium, lithium, ammonium and substituted ammonium salts of ethylenediamine tetraacetic acid, nitrilotriacetic acid, oxydisuccinic acid, melic acid, benzenepolycarboxylic acid and citric acid.

In addition to the components described above, the composition also contains several optional components. Examples include bubble promoters such as alkanol amides (especially monoethanolamides derived from palm or fatty acids), bubble release inhibitors, oxygen release bleaching agents such as sodium perborate and sodium percarbonate, peroxide bleaching precursors, trichloroisocyanuric acid and Such as chlorine-bleaching agents and inorganic salts such as sodium sulfate, and the trace components are usually fluorescent agents, fragrances, proteases, lipases (e.g., Lipolase (trade name, manufactured by Novo) and enzymes such as amylases, fungicides and coloring agents. And fabric softening clay materials.

The composition of the present invention can be prepared using conventional techniques known in the field of processing liquid detergent products. However, the order of addition of the ingredients is important. One preferred order of addition as a continuous mix is to add a water soluble electrolyte to water, add an insoluble substance such as aluminosilicate, add a polymer, and then add detergent-active substances mixed before adding to the electrolyte / water phase. Another preferred order of addition is to add an insoluble material such as aluminosilicate to water, a partially soluble polymer, followed by a detergent active material, and an electrolyte. The mixture is cooled to below 30 ° C. and then trace and additional ingredients are added. A preferred amount of second polymer can be added to reduce the viscosity. In practice it is possible to 'titrate' the viscosity to the desired level by gradually adding the second polymer. Finally, if desired, a small amount of caustic may be added to more precisely control the pH of the composition.

The invention will now be illustrated by the following non-limiting examples.

Raw material specification

The following specification is provided by way of example. All percentages are by weight unless otherwise indicated.

Detergent active material

Na LAS: Sodium dodecyl benzenesulfonate

LES: Lauryl ether sulfate (about 3 EO)

Nonionic (1): ethoxylated fatty alcohol (C _13-15 EO ₃ )

Nonionic (2): ethoxylated fatty alcohol (C _13-15 EO ₇ )

[Main Viscosity Reducing Polymer]

Polymer builder (1): copolymer of acrylate and maleate, sodium salt, maleic acid: acrylic acid = about 3.8: 1 1 average molecular weight about 70000

Polymer Bildon (2): copolymer of acrylate and maleate, sodium salt, maleic acid: acrylic acid = about 1.6: 1 average molecular weight about 50000

[2nd polymer]

(1) Na-polyacrylate, average molecular weight about 1, 200

(2) Na-polyacrylate, average molecular weight about 2, 500

(3) Na-polyacrylate, average molecular weight about 5,000

(4) Na-polyacrylate, average molecular weight about 8, 000

(5) Na-polyacrylate, average molecular weight about 15,000

(6) Na-polyacrylate, average molecular weight about 30,000

Trace ingredient

Enzymes = proteinases

TABLE 1

The following composition was prepared and its stability and viscosity are as follows.

The expression 'var' refers to a variable and the results of stability and viscosity measurements are shown in Tables 2 and 3, respectively. In the present specification, the term 'stable' generally refers to a state in which phase separation is 2% or less when stored for 3 months or more at a temperature (21-25 ° C.). The term "unstable" can be leaked accordingly.

TABLE 2

As can be seen from the table, the viscosity of the composition containing no polymer is too high to easily pour. It is evident that the amount of polymer that can be stably incorporated into the composition in which the polymer is only partially dissolved (see Table 4). When referring to composition II ₁ the polymer is completely dissolved at 3.5% but already this composition is unstable.

TABLE 3

It can be seen from the above results that the viscosity is reduced by the incorporation of the polymer (composition III), but when all the polymer (4.2%) is dissolved (pH <8.0), it causes instability. The viscosity is low compared to the viscosity of Table 1 and Table 2 because it does not contain zeolite.

Table 4

From the above results, it can be seen that all polymers are dissolved because they have a clear appearance at a pH of 7.95 or less. In addition, at higher pH, the polymer is present in a polymer-rich 'no cost' phase.

The following composition was prepared, and its stability and viscosity are shown in Table 6-Table 8.

TABLE 5

In the table, the expression 'var' means a variable, and the results of measuring stability and viscosity are shown in Table 6-8. In the present specification, the term 'stable' refers to a state in which phase separation is 2% or less when stored for 3 months or longer at atmospheric temperature (± 21-25 ° C.). The term 'unstable' can be inferred accordingly.

TABLE 6

As can be seen from the table, the viscosity of the composition containing no polymer is so high that it can be poured easily. It is evident that the amount of polymer that can be stably incorporated into the composition where the polymer is only partially dissolved (pH = 8.9) is at least 3.5% (see Table 4). When referring to the composition at pH 7.8 the polymer is completely dissolved but already unstable in the 3% polymer.

TABLE 7

As can be seen from the table above, the use of the polymer builder 2 results in viscosity checks (and thus increased fluidity) and also maintains a stable product. Under these conditions (pH 8.4), some of the polymer builders are dissolved.

TABLE 8

The results show that the viscosity decreases due to the incorporation of the polymer (composition VIII-VII), but leads to instability when all of the polymer (3.5%) is dissolved (pH ≦ 8.0).

TABLE 9

The following composition was prepared, and its stability and viscosity are shown in Table 10-13.

In the table, the expression 'var' refers to a variable and the results of stability and viscosity measurements are shown in Table 10-13. As used herein, the term 'stable' refers to a state in which phase separation is less than or equal to 2% when stored for 3 months or longer at an ambient temperature (± 21-25 ° C.). The term 'unstable' can be inferred accordingly.

TABLE 10

As can be seen from the table, the incorporation of the second polymer improves the fluidity of the product and in particular reduces the increase in viscosity even after storage.

TABLE 11

It can be seen from the above table that incorporation of the second polymer has the same stability and reduced viscosity. However, if the concentration of the second polymer is too high (0.6% of the second polymer), it will lead to an unstable product.

TABLE 12

It can be seen from the above table that the incorporation of the second polymer reduces the viscosity and thus improves the fluidity of the product and at the same time maintains excellent stability. However, if the concentration of the second polymer is too high (0.2% of the second polymer), it will lead to an unstable product.

TABLE 13

From the table it can be seen that a significant decrease in viscosity, and thus a significant increase in product flowability, can be achieved by incorporating 0.2-0.3% of a second polymer having a molecular weight in the range of 1200-30000. It should be noted that high molecular weight polymers are more effective than on a weight basis.

Claims (22)

A liquid detergent composition containing a detergent-containing substance dispersed in an aqueous phase containing a dissolved electrolyte and a viscosity-reducing polymer, wherein the liquid detergent composition contains only a part of the polymer in the electrolyte-containing aqueous phase. The liquid detergent composition according to claim 1, wherein the phase separation is 2% or less upon storage at 25 ° C. for 21 days. The liquid detergent composition according to claim 1, which has a viscosity of ¹ Pas or less at a transfer speed of 21S ^-2 . The liquid detergent composition according to claim 1, which is stable, i.e., a liquid detergent composition having a flotation separation of 2% or less upon storage at 25 DEG C for 21 days, wherein the total amount of polymer contained is more than the total amount of polymer in the reference composition, That is, one or more parameters may be dissolved so that when the polymer is dissolved, the reference composition becomes unstable, i.e., so that at least 25% of the polymer amount of the polymer having a phase separation of 2% or more of the reference composition upon storage at 25 ° C. for 21 days is dissolved. A liquid detergent composition, characterized in that for changing from. 5. The liquid detergent composition according to claim 4, wherein the parameter that can be changed in the reference composition is selected from the amount and nature of the pH electrolyte of the composition and the amount and nature of the detergent actives. The liquid detergent composition according to claim 1, wherein the viscosity reducing polymer is an alkali metal of polyacrylic acid, polymethacrylic acid or maleic acid or a copolymer containing anhydride. 7. The liquid detergent composition according to claim 6, wherein the liquid detergent composition has a pH of 8.0 or higher. The liquid detergent composition according to claim 1, which contains 0.5 to 4.5 wt% of a viscosity reducing polymer. The liquid detergent composition according to claim 8, which contains 1-3.5 wt% of a viscosity reducing polymer. The second polymer of claim 1, which is substantially completely dissolved in the aqueous phase and has a electrolyte resistance of at least 5 g of sodium nitrilotriacetic acid in its 5% aqueous solution 100, or the vapor pressure of a 20% aqueous solution is 2% polyethylene glycol (average molecular weight 6000). A liquid detergent composition further comprising a second polymer having a molecular weight of 100 or more, which is equal to or less than the vapor pressure of the aqueous solution. The liquid detergent composition according to claim 10, wherein the liquid detergent composition contains 0.05-20% by weight of the second polymer. The liquid detergent composition according to claim 10, wherein the average molecular weight of the second polymer is 1200-30000. The liquid detergent composition according to claim 10, wherein the second polymer has an average molecular weight of 2000 or more. The liquid detergent composition according to claim 10, wherein the second polymer has an average molecular weight of 5000-30000. The liquid detergent composition according to claim 1, wherein the detergent active material comprises (a) a nonionic surfactant and / or a polyalkoxylated anionic surfactant and (b) a non-polyalkoxylated anionic surfactant. The liquid detergent composition according to claim 1, wherein the electrolyte is contained in an amount of 1-60% by weight of the total composition. The liquid detergent composition according to claim 1, wherein the viscosity reducing polymer has a builder property. The liquid detergent composition according to claim 1, which contains suspended solid particulate material. 19. The liquid detergent composition according to claim 18, wherein the suspended solid particulate material contains water-insoluble aluminosilicate. 19. The liquid detergent composition according to claim 18, wherein the suspended solid particle material is composed of a dissolved electrolyte and an electrolyte such as some or all of the electrolyte. 19. The liquid detergent composition according to claim 18, wherein the suspended solid particulate material contains a water-insoluble bleach material. 22. The liquid detergent composition according to claim 21, wherein the bleaching substance is composed of DPDA.

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