PT99542B - A process for the preparation of a condensed liquid detergent composition containing alkylbenzene sulphonate and magnesium - Google Patents

Abstract

A concentrated light duty liquid detergent composition is described. The composition, which offers superior grease cutting and foam mileage, contains a surfactant mixture of magnesium alkylbenzene sulfonate, alkyl ethoxy sulfate and optionally, alkyl sulfate. The composition also contains a magnesium ion source in an amount such that the molar ratio of total magnesium ion to alkylbenzene sulfonate ranges from about 0.65:1.0 to 1.0:1.0.

Description

Invention Field

The present invention relates to a process for the preparation of aqueous liquid detergent compositions containing alkyl benzene sulfonate and magnesium ions at detergent activating levels.

Description of the Former Technique of the Specialty:

Light-acting liquid detergent compositions are well known, particularly those suitable for use in dishwashing. The action of these compositions is measured by the foam yield, that is, the number of dishes washed and the fat cutting capacity. The liquid dishwashing detergent compositions currently on the market are designed to remove oily / greasy dirt from glasses, plates and other kitchen utensils, while maintaining an acceptable foam layer.

Liquid detergent formulations containing magnesium salts and magnesium surfactants have a higher yield, as revealed in U.S. Patents 2,908,651 and 2,437,253. Certain combinations of active ingredients can also provide a range of better detergent properties. A better-performing liquid detergent composition, revealed in the

US patent 4,435,317, contains (a) a C 1-4 alkyl. ..- sulfate, it 1U (b) an alkyl C _{1 C) 16} -C ethoxy sulfate and (c) an alkyl ^C 1 ^-C 16 linear benzene sulfonate in a ratio of the total weight of (a) + ( b) for the weight of (c) less than or equal to 33: 1, and containing magnesium in a molar amount corresponding to 0.20x-0.70x where x is the number of moles of alkyl sulfate. The amount of magnesium salts that can be added to the compositions disclosed in US Patent 4,435,317 is limited, because the salts raise

the temperatures at which inorganic salt crystals form in the compositions after cooling.

A better action in relation to the fat cutting capacity and foam yield are also obtained when the concentration of surfactant active ingredients in the liquid detergent formulation is increased. There are, however, several problems associated with the preparation of liquid detergent compositions containing high portions of active detergent materials in order to satisfy the requirements for clarity, viscosity and stability of the product.

It is generally necessary to add a very high portion of hydrotrope to detergent compositions that have a high concentration of active detergent materials. Hydrotropes are quite expensive and are generally inactive materials and therefore do not contribute to detergency, but have the effect of rendering the active ingredients soluble in water and the composition homogeneous at temperatures normally found in transport and storage. Hydrotropes generally reduce the cloud point of liquid detergent compositions, thereby maintaining a clear liquid composition at temperatures at which a detergent composition lacking a hydrotrope would become cloudy and unappealing. US Patent 4,235,758 discloses that the use of a magnesium alkyl benzene sulfonate derived from a linear ^c 10 ^-c 13 alkyl-benzene with an average molecular weight of 220 - 250 significantly reduces the need for a hydrotrope at any level of detergent active material.

The present invention features compositions made up of certain specific detergent active ingredients, in unique combinations and proportions, which are unexpectedly superior in performance compared to other liquid detergents in terms of both foam yield and fat cutting.

Accordingly, it is an object of the present invention to present physically stable liquid detergent compositions, which offer superior foam and fat-cutting performance.

It is another object of this invention to present compositions containing magnesium, alkyl benzene sulfonate and additional levels of magnesium ions for activating detergency, which are especially effective in removing greasy soils and which have a reduced need for hydrotropes to maintain an adequate turbidity.

Yet another object of this invention is to present a concentrated detergent based composition containing magnesium ion and alkyl benzene sulfonate activating levels, which can be stored as a concentrated liquid based composition and which can be manufactured in conventional mixing of low-cut liquids.

SUMMARY OF THE INVENTION

According to the present invention, an aqueous liquid detergent composition especially suitable for dishwashing is presented, containing:

(A) 20 to 70%, preferably 30 to 55% of a surfactant mixture comprising: (a) about 15 to about 35% by weight of the magnesium salt of an alkyl acid ^{ce -C} 18 ^-sulfonic benzene; (b) about 1 to about 5%, by weight, of a magnesium salt, in an amount such that the molar ratio of total magnesium ion to alkyl benzene sulfonate ranges from about 0.65: 1.0 to 1.0: 1.0; (c) about 1 to about 20%, by weight, of a 10 ” ^c 16 alkyl ^and water soluble primary-ethoxy sulfate containing an average of about 1 to about 6 ethylene oxide groups per alkyl group in the alkyl-ether-sulfate, and (d) about 0 to about 20%, by weight, of a primary, secondary or tertiary amine or C-C-sulfate alkali metal salt; and (B) about 0.5 to about 8% by weight of a frothing agent selected from the group consisting of alkanol mono- or di-C ^^ - ^Cg-C 10 ethoxylated amides ^{"C and} not 18 ethoxylates and C-C-alkylamides condensed with up to about 15 mol of ethylene oxide per mol of amide; the rest being mostly water.

In a preferred embodiment, the composition may further include:

(C) about 0 to about 10%, by weight, of a slightly irritating organic solvent; and (D) about 0 to about 10%, by weight, of a hydrotrope. The compositions can also include (E) other adjuvants, namely chelating agents, coloring agents, pigments, perfumes, bactericides, fungicides, preservatives, sunlight filtering agents, pH modifiers, buffering agents, opacifiers, antioxidants, proteins and the like.

The present invention also features a pourable liquid detergent-based composition of light-acting concentrated liquid detergents containing acid containing

alkyl benzene sulfonic and magnesium ion detergent activating levels that can be stored at room temperature for later use, without gel.

Description of the Invention

The detergent compositions according to the present invention contain a mixture of two or three essential anionic surfactants of defined proportions and constitution and have a specific molar ratio of magnesium ion to alkyl benzene sulfonate ranging from 0.65: 1.0 to 1 , 0: 1.0.

The first essential surfactant ingredient is a water-soluble salt of alkyl benzene sulfonic acid, which can be linear or branched. The alkyl group preferably contains about 10 to 18 carbon atoms, most preferably about 11 to 13 and in particular 12 carbon atoms, preferably in a straight chain configuration. The alkyl benzene sulfonate can be present in the form of an alkaline earth metal, alkali metal, amine, ammonium salt, or, preferably, magnesium salt. Thus, the most preferred alkyl benzene sulfonate is the magnesium salt of linear dodecyl benzene sulfonate.

The acid form of alkyl benzene sulfonic acid can be converted to the magnesium salt form either before mixing with the other detersive ingredients or afterwards. The conversion can be carried out either by direct neutralization with magnesium oxide or hydroxide, or by ion exchange between, for example, an alkali metal salt or the ammonium salt of alkyl benzene sulfonate and a soluble alkaline earth metal salt. in water. Preferably, a magnesium ion source is added to the detergent mixture to form the desired salt of

Ί alkyl benzene sulfonate. Magnesium chlorides, magnesium sulfates, magnesium acetates or magnesium hydroxides are examples of sources of magnesium. The preferred sources of magnesium are magnesium oxides or hydroxides and sulfates.

The alkyl benzene sulfonate component is present at a level of about 15 to 35% by weight of the composition, preferably in the range of about 15 to 22%, more preferably in the range of about 19 to 21%, in Weight.

The point of attachment of the alkyl chain to the benzene core, referred to as the distribution of phenyl isomers, is not critical, although preferably less than 20% of the alkyl benzene of this invention contains the 2-phenyl isomer.

A second essential surfactant component of the present composition is a primary alkyl-ethoxy sulfate derived from the condensation product of a C. _n -C alcohol. _and with an average of about 1 to about 6 ethylene oxide groups, preferably about 2 to 4, in particular 3 ethylene oxide groups per mol of alcohol. C-C- alcohols can be derived, for example, from natural fats or formation of Ziegler olefins or Oxo synthesis. It is preferable to use alkyl ethoxy sulphates and alkyl sulphates with the same carbon chain length, preferably ^C i2 ^-C 13 * 0 alkyl ethoxy sulphate level in the present composition to obtain the desired foam and detersive properties. is about 1 - 30% by weight, preferably in the range of about 10-20% by weight, based on the total composition.

The surfactant system of the present invention the detergent may optionally also include an amount ranging from 0 20% of the total composition, preferably 10 - 15% by weight of an alkali metal salt or ammonium or amine of an anionic alkyl surfactant C _1Q -C ₁₈ linear ^or branched-sulfate. The alkyl sulfate cationic counterion can be removed from the group formed by alkali metals, ammonia and amines, for example, triethylammonium, triethanolamine (TEA), diethanolamine or monoethanolamine, etc. The alkali metal can be, for example, sodium or potassium, preferably sodium.

The composition of the present invention contains from about 0.027 to about 0.064 mol of total magnesium ion. Generally 0.023 to about 0.053 mol of magnesium ion is obtained by incorporating magnesium alkyl benzene sulfonate. Additional magnesium can be added to the composition in the form of a water-soluble compound, most preferably a salt, namely, for example, magnesium sulfate or magnesium chloride. The preferred source of magnesium is magnesium sulfate heptahydrate, added to the composition by about 1 or 2 to 5% by weight, preferably about 2.5 to 3.5% by weight, corresponding to 0, 01 to 0.014 mol of magnesium added. The ratio of total magnesium ion to alkyl benzene sulfonate in the composition is controlled to correspond to a molar ratio of 0.65: 1.0 to 1.0: 1.0, preferably 0.65: 1, 0 to 0.8: 1.0.

The other magnesium ions added in salt form provide better fat cutting performance and also reduce the cloud point of the formula better than the more expensive hydrotropes. The additional magnesium salt also provides better phase stability to the composition. The use of magnesium to activate detergency is a method well known in the art, however, when used in a molar ratio of total magnesium ion to alkyl benzene sulfonate in a range of 0.65: 1.0 to 0.8 : 1.0, the excess magnesium salt not only increases the foam yield but also increases fluidity, causing a reduction in hydrotrope and alcohol levels, thereby reducing the concentration of inactive ingredients that do not promote the detergency of the composition. This reduction in the level of inactive ingredients leaves space in the composition for an even higher level of active detersive ingredients.

The level of active detersive ingredients in the compositions of this invention is in the range of 20-70% by weight, preferably 30 to 55%. This higher level of active ingredients results in a higher foam yield, thereby providing a superior liquid detergent with light action. The usual problems of higher viscosity, less stability and turbidity of the product of a higher level of magnesium ions, in a magnesium for alkyl benzene sulfonate in the range of 0.65: 1.0 to 1.0: 1.0, preferably 0.8: 1.0 and no hydrotrope or just a small concentration of it. The additional magnesium ions in the compositions of this example also promote the detergency of the surfactant system.

are avoided by using ion molar ratio

In general, the consumer sees the ability to produce foam as a measure of cleaning capacity. A foam-promoting agent, such as, for example, a mono- or di-alkanolamide, can therefore be added to the present composition at a level of about 0.5 to about 8% by weight, preferably about from 1 to 6% and more preferably about 1 to 5% by weight. The preferred foam-promoting agent is a mixture of lauric and myristic monoethanolamides. Alternatively, the alkyl group of the amide can be derived from coconut or palm oil. Suitable alkanolamides include either mono- or di-alkanolamides having a carbon chain distribution of C ₁ -C ₅ , preferably C 1 -C 4, especially mono- or di-ethanolamide. The alkanolamide can be ethoxylated or it can be a mixture of non-ethoxylated alkanolamide and ethoxylated alkanolamide to increase the solubility of the alkanolamide in the composition.

Although not essential, the clarity and homogeneity of the compositions of the invention can be improved by including, for example, organic solvents or hydrotropes, and these and other non-essential additives can be included in the compositions in amounts that do not adversely affect the desired properties. Organic solvents can be included due to their fluidizing effect, ability to reduce the point of clarity and for reasons of solubilization. Organic solvents such as, for example, isopropanol, n-propanol, ethanol, propylene glycol or mixtures thereof can be included. When used, the solvent level is usually less than or equal to 10% by weight, preferably less than 8%, more preferably in the range of 5 to 8% by weight. Ethanol is the preferred solvent. It is also customary to include a hydrotropic substance in the composition such as, for example, urea, sodium xylene sulfonate, potassium xylene sulfonate, sodium cumene sulfonate and ammonium xylene sulfonate and the like to contribute to the solubilization of various components composition, maintaining a low point of clarity. Mixtures of two or more hydrotropes can also be used. The hydrotrope, when used, is generally present in amounts of less than 8%, preferably less than 6%, namely 1 to 6%, in particular 2 to 5% by weight.

Various other optional ingredients can also be included in the composition due to their aesthetic or functional characteristics. Such ingredients include, for example, opacifying agents to give the composition a pearly appearance, namely behenic acid or ethylene glycol distearate; Perfumes; carbide chelating agents such as EDTA; bactericides such as trichlorocarbanilide, tetrachlorosalicylanilide, hexachlorophene, or chlorobromosalicylanilide; anti-oxidants; thickeners such as guar gum, polyacrylates, polyacrylamide or Irish moss; dyes, water-dispersible pigments;

preservatives, such as formaldehyde or hydrogen peroxide; pH modifiers, etc. When used, these optional adjuvants can be present in total amounts up to about 10% by weight, preferably up to about 3% by weight, based on the total composition. The pH of the compositions can range from 6 to 8, preferably from about 6.5 to 7.5, and can be adjusted, if necessary, by adding suitable bases and acids, namely HCl, NaOH and the like . Excellent removal of greasy dirt is achieved when an effective amount of the present compositions is dissolved in an aqueous dishwashing solution. Typical concentrations of use are generally at least about 0.05% by weight in water. This can, of course, be adjusted, depending on the level and type of dirt and consumer demands.

There is usually great commercial interest in the most concentrated liquid detergent compositions. The advantages of highly concentrated liquids are evident, that is, reduced transport and packaging costs and smaller quantities of product needed by the consumer compositions with high difficulty in executing the process.

-ν

The biggest disadvantage presented by the levels of active ingredients is the formula due to the high concentrations of solids ”. The word solids is used here to describe all ingredients of the composition other than solvents, such as water or alcohol.

The compositions of the present invention contain high levels of anionic surfactants, which are, in general, less soluble in water than nonionic surfactants. The reduced solubility of anionic surfactants associated with the high concentration of active ingredients often results in thick pastes with very high viscosities, thus requiring the use of enhanced-action mixing equipment or

high-cut. Thus, in a preferred embodiment of the present invention, an unconventional process is used for the preparation of the respective compositions.

According to this preferred method, a detergent base consisting of magnesium alkyl benzene sulfonate and amide-based foam activator is preferably prepared by a process in which the alkanolamide, in the specified amount, is added to an aqueous paste containing magnesium oxide, or hydroxide, hydrotropes, and any inorganic salts or organic solvents of the liquid detergent compositions of this invention, in the specified amounts, and the alkyl benzene sulfonic acid is added after the alkanolamide has been dissolved in the slurry. This procedure is described in more detail in our equally pending order, Series No.? , deposited on the same date of the application under the rubric, reference IR-4863, entitled PROCESS FOR PRODUCING CONCENTRATED LIQUID DETERGENT BASE CONTAINING MAGNESIUM ALKYLBENZENE SULFONATE AND AKKANOLAMIDE AND ALCANOLAMIDE, the disclosure of which is hereby incorporated by reference. This process has the advantage of using conventional liquid mixing equipment, resulting in a composition with greater fluidity during neutralization and after cooling.

The following representative non-limiting examples illustrate the invention, although the applicants do not intend to stay connected to them.

Example 1

The following compositions are prepared with conventional low-cut mixing equipment, mixing the materials in the indicated proportions.

Operation No.

2 (% weight)

Deionized water 11.66 11.28 TEA lauryl sulfate (40% solution) 28.75 28.75 Sodium alkyl ethoxy sulfate, 3EO 18.02 (66.6%) 17.7 (67.8%) Sodium xylene sulfonate (sol.40%) - 5.23 Sodium cumene sulfonate (93%) 2.9 1.0 Magnesium oxide 1.16 1.16 MgSO ₄ .7H ₂ O 1.0 3.0 Na ₂ SO ₄ 1.5 0.5 Lauric-myristic monoethanolamide - 3.49 (prill) Mixture of wooluric monoethanolamide myristic / sodium xylene sulfonate (5: 3) 8.72 - Ethanol 5.5 7.5 Dodecyl-benzene sulfonic acid 18.75 18.87 Minor ingredients (dye, perfume, etc.) 2.04 1.52 100% 100% +2 Molar ratio of Mg: Alkyl-benzene 0.54: 1.0 0.67: 1.0 sulfonate Cloud point 6 ° C 0 ° C

The composition of Operation No. 2 is a physically stable liquid after accelerated aging at elevated temperature.

It was found that the composition of Operation No. 1, although having a higher hydrotrope level, presented phase separation with aging. Compositions 1 and 2 were evaluated according to the following performance criteria:

(A) Fat Removal Test

This test is performed to measure the grease removal capacity of the liquid detergent composition at a concentration of 1%, with water at 50 ppm hardness, at 26.7 ° C (80 ° F), with 600 immersion cycles at 60 rpm. For this test, 0.5 g of lardo is applied, at room temperature, evenly on a microscope frosted glass slide using a serrated knife. Results are calculated on the basis of milligrams of removed lardo.

A modified version of the Fat Removal Test is used to measure the fat removal capacity of a 0.05% liquid detergent solution with water at a hardness of 50 ppm and 42.2 ° C (108 ° F) , with 600 immersion cycles at 60 rpm. For this test, 0.1 ± 0.02 g of lardo is applied in plastic test tubes, immersing previously weighed tubes in molten lardo and removing any excess fat before solidifying. The tubes are re-weighed and used the same day they were prepared.

The detergent compositions to be tested are prepared, heated to the appropriate temperature and poured into 250 ml beakers. The desired temperature of the solution is maintained by a circulating water bath. The test composition is agitated with a suitable beaker until a foam layer is formed that covers the surface. The dirty beakers and tubes are placed in the immersion apparatus, which are then operated at 600

cycles at 60 rpm. After the test cycle is completed, the tubes are removed, rinsed in deionized water at 25 ° C (77 ° F) and air dried overnight and weighed. The dirt removal performance (cleaning percentage) is then calculated using the following formula:

B-C% cleaning = - x 100,

B-A where A = weight of the tube, B = weight of the tube plus dirt, C = weight of the tube after washing.

Table 1 shows a comparison of the average amount of greasy dirt removed by the composition of Operation No. 2 with the lightest dishwashing composition that is best sold on the market (Control 2) as determined by the Fat Removal Test at a detergent concentration of 0.05%, water of 50 ppm hardness, 42.2 ° C (108 ° F), 600 immersion cycles at 60 rpm.

(B) Manual Dishwashing Test

Six liters of a diluted test solution (0.1% or 0.075%) prepared with 50 ppm water at 48.9 ° C (120 ° F) are poured into a crockery via a separating funnel suspended above the produce a layer of foam. Dirty dishes with 5.4 g of lardo are washed to the end of the foam. This test measures the total number of dishes that can be washed with the detergent composition until the foam has completely disappeared.

(C) Dynamic Foam Stability Test

This test is used to determine the dynamic foam stability of a liquid detergent composition in water of 50 ppm hardness at 45 ° C (113 ° F).

A diluted test solution (0.05 or 0.04%) is titrated with a constant supply of mixed dirt to a foam end point under constant agitation. The test measures the amount of mixed dirt required to deplete the surfactants in the composition.

(D) Cylinder Foam Test:

This test is used to determine the foaming ability of a liquid detergent composition in water of 50 ppm hardness at 45 ° C (113 ° F).

100 ml of a 0.1% LAL (Light Action Liquid) test solution is placed in a 500 ml graduated cylinder. The cylinder is inverted 20 times and the amount of foam is measured. Dirt (0.01 g) is added to the solution and the cylinder is then inverted again 20 times. Note is then taken of the reduced foam level.

The test results for the compositions of Operations Nos. 1 and 2 and the results of the two different light-acting commercial dishwashing compositions that are best sold on the market are shown in Table 2.

TABLE 1% Average Dirt Removal

42.2 ° C (108 ° F)

Operation 2 50.9

Control 2 22.1

The results of this test indicate that the composition of Operation No. 2 removes twice as much greasy dirt at 42.2 ° C (1 ° 8 ° F) than the most commercially sold brand of hand dishwashing detergent containing similar detersive active ingredients, but that has a molar ratio of magnesium ion to alkyl benzene sulfonate of 0.31: 1.0.

V

TABLE 2

Coni.Testes Yield I Coni.Testes Yield II

Test Method

Oper.1 Control 1 Ratio Oper.2 Control 2 Ratio

Hand Wash (1)

0.1% LAL 5.4g lardo 48.9 ° C (120 ⁰ F)

Hand Wash (1)

0.075% LAL 5.4g lardo 4 8.9 ⁰ C (12 0 ⁰ F)

34.5 28.5

1.21

35.7

33.4 1.07

Fat removal (2) 107

1% LAL

600 cycles 60 rpm lardo dirt 26.7 ° C (80 ° F)

220

190

1.16

1.09

1.11

1.37

1.28 1.07

Foam in

Cylinder (4) 375 /

205 / 1.83 /

365 /

285 / 1.28 /

Dynamic Test

Stability of

Foam (3) 1.21

45 ° C (113 ° F)

0.1 / LAL 342 165 2.07 335 265 1.26 cycles 30 rpm

37.8 ° C (100 ° F) (0.01 mixed dirt from food)

In all tests, water of 50 ppm hardness was used.

(1) The results of manual washing are counting plates to \ the foam end point.

(2) The results of fat removal are milligrams of larva removed.

(3) The results of Dynamic Foam Stability are foam yield ratios versus a standard liquid detergent composition containing 34% surfactant ingredients.

(4) The results of the cylinder test are cm of foam (not soiled / soiled).

Control 1: Brand that best sells on the composition market for manual dishwashing containing 50% active ingredients including 17% linear alkyl ¹ -benzene sulfonate, 23% alkyl ethoxy sulfate, 10% acid monoethanolamide fat and a total magnesium content of 0.70%.

This composition has a molar ratio of magnesium to alkyl benzene sulfonate of 0.58: 1.0.

Control 2: Second best-selling brand in the composition market for manual dishwashing containing 56% of active ingredients including 24% linear alkyl-benzene sulfonate, 22% alkyl-ethoxy sulfate. 30E, 10% fatty acid ethoxylated monoethanolamide and also containing 0.5% magnesium, corresponding to a molar ratio of magnesium to alkyl benzene sulfonate of 0.31: 1.0.

Example 2

A pourable stable liquid detergent composition is prepared by mixing the following ingredients in a conventional low-cut liquid mixing equipment in the following proportions:

Operation No.

2 (% weight)

Deionized water 22.1 17.6 TEA lauryl sulfate - 12.0 Sodium alkyl ethoxy sulfate, 3E0 14.0 15.2 Sodium xylene sulfonate (sol.40%) 12.0 13.1 Sodium cumene sulfonate (sol. 45%) 4.7 5.2 Magnesium oxide 1.8 1.1 MgSO ₄ .7H ₂ O 4.8 5.5 Na_SO. 2 4 - 0.5 Lauric-myristic monoethanolamide (prill) 8.0 8.0 Propylene glycol 2.3 2.5 Dodecyl-benzene sulfonic acid 30.3 19.3 Total 100% 100% Consistency at 25 ° C Liquid physically stable Liquid physically stable

Λ f

Claims (4)

I ^a . - Process for the preparation of a liquid detergent composition for dishwashing, which has stable foaming characteristics and which is especially effective in removing oily soils, characterized in that it includes: (A) about 20 to about 70%, by weight, of a surfactant system consisting of: (a) about 15 to about 35%, by weight, of the magnesium salt of an anionic surfactant of C ₁₀ -C ₁₈ alkyl-benzene sulfonic acid; (b) about 1 to about 5%, by weight, of a water soluble magnesium salt, in an amount such that the molar ratio of total magnesium ion to alkyl benzene sulfonate ranges from about 0.65: 1 , 0 to 1.0: 1.0; (c) about 1 to about 20% by weight of an alkyl ^{ce "c} primary ethoxy sulfate i6 water soluble containing an average of about 1 to about 6 groups of ethylene oxide per alkyl group in alkyl ether sulfate, and (d) about 0 to about 20%, by weight, of a primary, secondary or tertiary amine or alkali metal salt of CC alkyl sulfate; and ll) lo (B) about 0.5 to about 8%, by weight, of a foam promoting agent selected from the group consisting of C mono or di-alkanol, C-ethoxylated amides. -C-_ and non-ethoxylated and 1 O 1U C ₁₂ -C ₁₄ alkylamides condensed with up to about 15 mol of ethylene oxide per mol of amide; (C) about 0 to about 10%, by weight, of a slightly irritating organic solvent; (D) about 0 to about 10% by weight of hydrotrope; and (E) about 0 to about 10%, by weight, of one or more optional additives selected from the group consisting of chelating agents, coloring agents, pigments, perfumes, bactericides, fungicides, preservatives, sunlight filtering agents, pH modifiers, pH buffering agents, opacifiers, antioxidants, proteins and (F) water to be made up. 23. The method of claim 1, characterized in that the composition includes: (A) about 30 to 55%; (B) about 1 to 6%; (C) about 5 to 8%; (D) about 0 to 6%; (E) about 0 to 3%; and (F) water to be made up. 3®. - Process according to claim 1, characterized in that the surfactant system (A) comprises (a) about 19 to about 21% by weight magnesium salt of an alkyl acid _{C10 br} benzene -sulfonie; (b) an amount of a water-soluble magnesium salt, sufficient for the molar ratio of total magnesium ion to alkyl benzene sulfonate to vary) from about 0.65: 1.0 to 0.8: 1.0 ; (c) about 10 to about 13% by weight of a ^C l6 ^-C io ^a l ^{<3 u} i ii ^{-etox "su} ifato with 3 groups of ethylene oxide per mole of alcohol, and (d) about 10 to about 15% by weight of a C, -C, -sulfate alkyl. 1U it ι .. 4th. - Process for the preparation of a physically stable liquid detergent composition, for dishwashing, characterized in that it includes: (A) about 30 to about 70%, by weight, of detersive active ingredients consisting of: (a) about 10 to about 50%, by weight, of the magnesium salt of a C-C alkyl acid. benzene-sulfonic acid; (b) about 1 to about 5%, by weight, of a water-soluble magnesium salt, in such an amount that the molar ratio of total magnesium ion to alkyl benzene sulfonate ranges from about 0.65: 1.0 to 1.0: 1.0; (c) about 1 to about 27%, by weight, of a 1U water-soluble C-C.primyl-ethoxy sulfate salt containing an average of about 1 to about 6 ethylene oxide groups by alkyl group; an amine (d) about 0 to about 27%, by weight, of alkali metal primary or alkali metal salt C ₁₀ -C ₁₆ ~ sulfate; and (B) about 0.6 to about 11% by weight of a frothing agent selected from the group consisting of mono- or di-C₁-C₄ alkanol amides ^and 10 ^"C 16 ^and C ₁₂ alkyl - C ₁₄ ~ aides condensed with up to about 15 mol of ethylene oxide per mol of amide; (C) about 0 to about 10%, by weight, of a slightly irritating organic solvent; (D) about 0 to about 8%, by weight, of hydrotrope; and (F) water to be made up. 5th. Process according to claim 4, characterized in that said composition includes: (THE) fence in 60 The 65%; (B) fence in 1 The fence in 8%; (Ç) fence in 2, 5 about , of 3 , 5%; (D) fence in 1 The fence in 5%; and (E) water to make up. 63. The method of claim 4, characterized in that the surfactant system (A) consists of a water-soluble magnesium salt in an amount sufficient to provide a molar ratio of total magnesium ion to magnesium alkyl benzene sulfonate in the range from 0.65: 1.0 to 0.8: 1.0.