EP2480645A1

EP2480645A1 - Dishwasher detergent

Info

Publication number: EP2480645A1
Application number: EP10749664A
Authority: EP
Inventors: Dorota SENDOR-MÜLLER; Johannes Zipfel; Arnd Kessler; Christian Nitsch; Thorsten Bastigkeit; Thomas Eiting; Volker Blank
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 2009-09-21
Filing date: 2010-09-08
Publication date: 2012-08-01
Also published as: US20120167922A1; WO2011032868A1; DE102009029637A1; KR20120083347A

Abstract

The invention relates to a phosphate-free dishwasher detergent comprising a structured material, comprising: a) 0.5 to 7.0 wt % of a non-ionic surfactant A; b) 0.2 to 5.0 wt % of a non-ionic surfactant B having a melting point above 25°C, each with respect to the total weight of the dishwasher detergent, characterized in that the non-ionic surfactant A has a melting point at least 5°C below the melting point of the non-ionic surfactant B, wherein said detergent is characterized by excellent residue inhibition and good cleaning and clear rinsing performance.

Description

"Machine dishwashing detergent"

This application relates to phosphate-free automatic dishwashing detergents which contain a combination of nonionic surfactants.

Machine-washed dishes are often subject to more stringent requirements today than manually-washed dishes. So the dishes after machine cleaning should not only be completely free from food debris but also, for example, should have no whitish, based on water hardness or other mineral salts stains that come from lack of wetting agent from dried water droplets.

Modern automatic dishwashing detergents fulfill these requirements by integrating cleansing, caring, water-softening and clear-rinsing active ingredients and are suitable for this purpose

For example, consumers are known as "2in1" or "3in1" dishwashing detergents. As essential for the cleaning as for the rinse aid success constituent intended for the private consumer dishwasher automatic dishwashing contain builders. On the one hand, these builders increase the alkalinity of the cleaning liquor, whereby fats and oils are emulsified and saponified with increasing alkalinity, and on the other hand reduce the water hardness of the cleaning liquor by complexing the calcium ions contained in the aqueous liquor. As particularly effective builders, the alkali metal phosphates have proven, for this reason, the main component of the vast majority of commercially available machine

Form dishwashing detergent.

Thus, while the phosphates are highly valued for their beneficial effect as a component of automatic dishwashing detergents, their use is from the standpoint of

Environmental protection, however, is not without its problems, since a substantial part of the phosphate enters the water via household wastewater and plays a critical role in overfertilisation, especially in stagnant water (lakes, barrages). As a result of this phenomenon, also referred to as eutrophication, the use of pentasodium triphosphate in laundry detergents in a number of countries, e.g. USA, Canada, Italy, Sweden, Norway, significantly reduced by law and regulations. completely prohibited in Switzerland. In Germany, detergents since 1984 may contain no more than 20% of this builder.

In addition to nitrilotriacetic acid, especially sodium aluminosilicates (zeolites) are used as phosphate substitutes or substitutes in textile detergents. However, these substances are not suitable for use in automatic dishwashing detergents for various reasons. As alternatives to the alkali metal phosphates in automatic dishwashing detergents is therefore in the Literature discussed a number of substitutes, of which the citrates are particularly noteworthy.

Phosphate-free automatic dishwashing detergents which, in addition to a citrate, furthermore contain carbonates, bleaches and enzymes, are described, for example, in European patents EP 662 1 17 B1 (Henkel KGaA) and EP 692 020 B1 (Henkel KGaA).

Another alternative to the alkali metal phosphates used as the sole builder but preferably in combination with citrates is methylglycine diacetic acid (MGDA). Machine dishwashing detergents containing MGDA are described, for example, in European patent EP 906 407 B1 (Reckitt Benckiser) or in European patent application EP 1 1 13 070 A2 (Reckitt Benckiser).

Despite the efforts so far, the manufacturers of automatic dishwashing detergents have hitherto not been able to provide phosphate-free automatic dishwashing detergents which are comparable or even exceed phosphate-containing detergents with regard to their cleaning and rinsing performance and, in particular, their coating-inhibiting performance. However, such an equality of performance is a prerequisite for the successful market introduction of phosphate-free detergents, since the vast majority of end consumers will always decide against an ecologically beneficial product despite wide public discussion of environmental issues, if this does not meet the market standard in terms of its price and / or performance.

In view of this initial situation was therefore the task of the present

Application in the provision of a phosphate-free automatic dishwashing detergent, which in terms of its cleaning performance as well as in terms of its rinse results and its performance with respect to the coating inhibition with conventional phosphate-containing

Detergents is comparable or even exceeds.

It has been found that the formation of deposits in phosphate-free systems can be favorably influenced by the choice of the surfactant system, with the resulting phosphate-free automatic dishwashing detergents still having good cleaning and rinsing performance in addition to an above-average inhibition of coating.

A first subject of the present application is therefore a builder-containing,

Non-phosphate machine dishwashing detergent containing, in each case based on the

Total weight of the automatic dishwashing detergent

a) 0.5 to 7.0% by weight of nonionic surfactant A b) 0.2 to 5.0 wt .-% of nonionic surfactant B having a melting point above 25 ° C, characterized in that the nonionic surfactant A has a melting point which is at least 5 ° C below the melting point of the nonionic surfactant B.

Surprisingly, it was found that the melting points of the nonionic surfactants used in the surfactant system according to the invention, the deposit formation in machine

Influence dishwashing. A prerequisite for this technical effect is, inter alia, that at least one of the surfactants used has a melting point above 25 ° C. Both nonionic surfactants A and B may have a melting point above 25 ° C

Interestingly, a further reduction in deposit formation can be achieved. Automatic dishwashing detergents according to the invention, in which both nonionic surfactants A and B have a

Melting point above 25 ° C, are therefore preferably used. Particular preference is given to machine dishwashing detergents according to the invention in which both nonionic surfactants A and B have a melting point above 28 ° C., preferably above 31 ° C.

The temperature difference between the melting points of the nonionic surfactants A and B is preferably at least 6 ° C and especially at least 8 ° C.

The deposit-inhibiting effect of automatic dishwashing agents according to the invention is, in addition to the melting points of the nonionic surfactants, also determined by their weight ratio. In principle, the proportion by weight of the lower melting nonionic surfactant A, based on the surfactant system of surfactants A and B, should be between 50 and 95% by weight. With regard to their deposit-inhibiting action, however, dishwasher detergents according to the invention are preferred in which the weight fraction of nonionic surfactant A in the total amount of nonionic surfactants A and B is between 50 and 95% by weight, preferably between 55 and 90% by weight and in particular between 60 and 80 wt .-% is.

The weight fraction of the nonionic surfactant A in the total weight of the machine

Dishwashing agent is preferably between 0.5 and 7.0 wt .-%, preferably between 1, 0 and 6.0 wt .-% and in particular between 2.0 and 5.0 wt .-%, while the nonionic surfactant B in Automatic dishwashing detergents according to the invention, based on the latter

Total weight, preferably in amounts between 0.2 and 5.0 wt .-%, preferably between 0.5 and 4.0 wt .-%, preferably between 1, 0 and 3.0 wt .-% and in particular between 0, 5 and 2.5 wt .-% is included.

In addition to the aforementioned factors, the deposit-inhibiting effect of automatic dishwashing detergents according to the invention is furthermore also due to the structure of the non-ionic detergents used Surfactants influenced. So were particularly convincing results in terms of the

Surface inhibition achieved in particular by endgrupperverschlossene nonionic surfactants from the group of Hydroxymischether. These nonionic surfactants have been found to be superior to the other known nonionic surfactants of the prior art.

A further preferred constituent of the automatic dishwashing detergents according to the invention are therefore nonionic surfactants of the general formula R -CH (OH) CH ₂ O- (AO) _w - (AO) _x - (A'O) _y - (A '"O) _z - R ² , in the

R and R ² are a C ₂ -26 alkyl;

A, Α ', A "and A'" independently represent a radical from the group

-CH ₂ CH ₂ -, -CH ₂ CH ₂ -CH ₂ -, -CH ₂ "CH (CH ₃ ) -, -CH ₂ -CH ₂ -CH ₂ -CH ₂ -, -CH ₂ -CH (CH ₃ ) -CH ₂ -, -CH ₂ -

CH (CH ₂ -CH ₃ ) - stand,

w, x, y and z independently represent values between 0.5 and 120, where x, y and / or z can also be 0.

Machine dishwashing detergents according to the invention, in which at least one of the nonionic surfactants A or B has the abovementioned general formula, are preferred on account of their better coating appearance.

Preference is given in particular to those end-capped poly (oxyalkylated) nonionic surfactants which, in accordance with the formula R 0 [CH ₂ CH ₂ O] _x CH ₂ CH (OH) R ² , in addition to a radical R which is linear or branched, saturated or unsaturated, aliphatic or aromatic

Hydrocarbon radicals having 2 to 30 carbon atoms, preferably 4 to 22

Carbon atoms, furthermore a linear or branched, saturated or

unsaturated, aliphatic or aromatic hydrocarbon radical R ² having 1 to 30

Have carbon atoms, wherein x stands for values between 1 and 90, preferably for values between 30 and 80 and in particular for values between 30 and 60.

Particular preference is given to surfactants of the formula R 0 [CH ₂ CH (CH 3) O] _x [CH ₂ CH ₂ O] _y CH ₂ CH (OH) R ² in which R is a linear or branched aliphatic hydrocarbon radical having 4 to 18 Carbon atoms or mixtures thereof, R ^{2 is} a linear or branched

Hydrocarbon radical having 2 to 26 carbon atoms or mixtures thereof and x for values between 0.5 and 1, 5 and y is a value of at least 15 stands.

The group of these nonionic surfactants include, for example, the C ₂ -26 fatty alcohol (PO) i (EO) i ₅ . 4o-2-hydroxyalkyl ethers, in particular also the C ₈ -io-fatty alcohol (PO) i (EO) ₂₂ -2-hydroxydecyl ethers.

Particular preference is furthermore given to those end-capped poly (oxyalkylated) nonionic surfactants of the formula R 0 [CH ₂ CH ₂ O] _x [CH ₂ CH (R ³ ) O] _y CH ₂ CH (OH) R ² , in which R and R ^{2 are} independent each other for a linear or branched, saturated or single or multiple unsaturated hydrocarbon radical having 2 to 26 carbon atoms, R ^{3 is} independently selected from -CH ₃ , -CH ₂ CH ₃ , -CH ₂ CH ₂ -CH ₃ , -CH (CH ₃ ) ₂ , but preferably -CH ₃ , and x and y independently represent values between 1 and 32, with nonionic surfactants with R ³ = -CH ₃ and values for x of 15 to 32 and y of 0.5 and 1.5 being very particularly preferred.

Further preferred nonionic surfactants are the end-capped poly (oxyalkylated) nonionic surfactants of the formula R 0 [CH ₂ CH (R ³ ) O] _x [CH ₂ ] _k CH (OH) [CH ₂ ] _j OR ² in which R and R ² for linear or branched, saturated or unsaturated, aliphatic or aromatic

Hydrocarbon radicals having 1 to 30 carbon atoms, R ^{3 is} H or a methyl, ethyl, n-propyl, iso-propyl, n-butyl, 2-butyl or 2-methyl-2-butyl radical, x is Values between 1 and 30, k and j represent values between 1 and 12, preferably between 1 and 5. When the value x> 2, each R ³ in the above formula R 0 [CH ₂ CH (R ³ ) O] _x [CH ₂ ] _k CH (OH) [CH ₂ ] _j OR ^{2 may be} different. R and R ² are preferably linear or branched, saturated or unsaturated, aliphatic or aromatic hydrocarbon radicals having 6 to 22

Carbon atoms, with radicals having 8 to 18 carbon atoms are particularly preferred. For the radical R ³ , H, -CH ₃ or -CH ₂ CH _{3 are} particularly preferred. Particularly preferred values for x are in the range from 1 to 20, in particular from 6 to 15.

As described above, each R ³ in the above formula may be different if x> 2. As a result, the alkylene oxide unit in the square bracket can be varied. For example, when x is 3, the radical R ³ can be selected to form ethylene oxide (R ³ = H) or propylene oxide (R ³ = CH ₃ ) units which may be joined in any order, for example (EO) ( PO) (EO), (EO) (EO) (PO), (EO) (EO) (EO), (PO) (EO) (PO),

(PO) (PO) (EO) and (PO) (PO) (PO). The value 3 for x has been selected here by way of example and may well be greater, the range of variation increasing with increasing x values and including, for example, a large number (EO) groups combined with a small number (PO) groups, or vice versa ,

Particularly preferred end-capped poly (oxyalkylated) alcohols of the above formula have values of k = 1 and j = 1, so that the above formula zu

R 0 [CH ₂ CH (R ³ ) O] _x CH ₂ CH (OH) CH ₂ OR ² simplified. In the latter formula, R, R ² and R ^{3 are} as defined above and x is from 1 to 30, preferably from 1 to 20 and in particular from 6 to 18. Particularly preferred are surfactants in which the radicals R and R ² Have 9 to 14 carbon atoms, R ^{3 is} H and x assumes values of 6 to 15.

Finally, the nonionic surfactants of the general formula R -CH (OH) CH ₂ O- (AO) _w -R ^{2 have} proved to be particularly effective, in which R stands for a straight-chain or branched, saturated or mono- or polyunsaturated _C6 -24 alkyl or alkenyl group;

R ^{2 is} a linear or branched hydrocarbon radical having from 2 to 20 carbon atoms;

A is a radical from the group CH ₂ CH ₂ , -CH ₂ CH ₂ -CH ₂ , -CH ₂ -CH (CH ₃ ), and w is from 10 to 120, preferably from 10 to 80, in particular from 20 to 40 The group of these nonionic surfactants includes, for example, the C ₄ . ₂₂ fatty alcohol (EO) i ₀ -8o-2-hydroxyalkyl ethers, in particular also the C ₈ -i ₂ fatty alcohol (EO) ₂₂ -2-hydroxydecyl ethers and the C ₄ . 2 ₂ fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

Automatic dishwashing detergents preferred according to the invention are free of anionic surfactants.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 1:

nonionic surfactant of the general formula C ₄ . ₂₂ fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ether nonionic surfactant of the general formula C ₄ . ₂₂ fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

However, the automatic dishwashing agents of the invention contain builders but no phosphate.

A first group of useful builders are the inorganic builders, in particular the carbonates and silicates.

Particularly preferred is the use of carbonate (s) and / or bicarbonate (s), preferably alkali metal carbonate (s), more preferably sodium carbonate. Machinery

Dishwashing detergent, characterized in that the automatic dishwashing detergent contains carbonate, wherein the proportion by weight of the carbonate in the total weight of the machine

Dishwashing agent is preferably between 5 and 50 wt .-%, preferably between 10 and 45 wt .-% and in particular between 15 and 40 wt.%, According to the invention are preferred.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 2:

nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ether nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

The group of preferred silicates includes crystalline layered silicates as well as amorphous silicates. By contrast, automatic dishwasher detergents according to the invention preferably contain no zeolites.

With preferred crystalline layered silicates of general formula NaMSi be _x 0 _{2x +} i ^■ y H ₂ 0 used wherein M is sodium or hydrogen, x is a number from 1, 9 to 22, preferably from 1: 9 to 4, particularly preferred values x is 2, 3 or 4, and y is a number from 0 to 33, preferably from 0 to 20. The cleaning compositions of the invention preferably contain a weight proportion of crystalline layered silicate of the formula NaMSi _x 0 _{2x +} y i ^■ H ₂ 0 of 0.1 to 20 wt .-%, preferably from 0.2 to 15 wt .-% and in particular 0, 4 to 10 wt .-%, each based on the total weight of these agents. With regard to the formation of deposits, it has proven to be advantageous to reduce the proportion by weight of silicate on the

To limit the total weight of the automatic dishwashing detergent. Preferred automatic dishwasher detergents therefore comprise less than 8.0% by weight of silicate, particularly preferably less than 6.0% by weight of silicate and in particular less than 4.0% by weight of silicate, ie for example between 0.1 and 4, 0 wt .-% silicate.

It is also possible to use amorphous sodium silicates with a Na ₂ O: SiO ₂ modulus of from 1: 2 to 1: 3.3, preferably from 1: 2 to 1: 2.8, and in particular from 1: 2 to 1: 2.6.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 3:

nonionic surfactant of the general formula C ₄ . ₂₂ fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ethers nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

As organic co-builders are, in particular, polycarboxylates / as the citrate, ethylenediamine-N, ^{N'-disuccinate} (EDDS) and phosphonates mentioned.

Automatic dishwashing agent, characterized in that the automatic dishwashing agent at least one builder from the group of organic complexing agent, preferably at least an organic complexing agent from the group of citrate, ethylenediamine-N, N ^'- disuccinate (EDDS), and phosphonate are preferred in the invention.

A particularly preferred ingredient of the invention is the citrate. The term "citrate" also encompasses citric acid and its salts, in particular their alkali metal salts, Particularly preferred automatic dishwashing agents according to the invention contain citrate, preferably sodium citrate, in amounts of 12 to 50% by weight, preferably 15 to 40% by weight in particular 15 to 30 wt .-%, each based on the total weight of the automatic dishwashing detergent.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 4:

nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ethers

'Nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

Further useful organic builders are, for example, the polycarboxylic acids which can be used in the form of the free acid and / or their sodium salts, polycarboxylic acids meaning those carboxylic acids which carry more than one acid function. For example, these are adipic acid, succinic acid, glutaric acid, malic acid, tartaric acid, maleic acid, fumaric acid, sugar acids, aminocarboxylic acids, nitrilotriacetic acid (NTA), if such use is not objectionable for ecological reasons, and mixtures thereof. In addition to their builder effect, the free acids typically also have the property of a

Acid component and thus also serve to set a lower and milder pH of detergents or cleaners. In particular, succinic acid,

Glutaric acid, adipic acid, gluconic acid and any mixtures of these. The complex-forming phosphonates include, in addition to the 1-hydroxyethane-1, 1-diphosphonic acid a number of different compounds such as

Diethylenetriaminepenta (methylenephosphonic acid) (DTPMP). Hydroxyalkane or aminoalkane phosphonates are particularly preferred in this application. Among the hydroxyalkane phosphonates, 1-hydroxyethane-1,1-diphosphonate (HEDP) is of particular importance as a co-builder. It is preferably used as the sodium salt, wherein the disodium salt neutral and the

Tetrasodium salt alkaline (pH 9) reacts. Preferred aminoalkanephosphonates are ethylenediamine tetramethylenephosphonate (EDTMP), diethylenetriaminepentamethylenephosphonate (DTPMP) and their higher homologs. They are preferably in the form of neutral sodium salts, eg. B. as hexasodium salt of EDTMP or as hepta- and octa sodium salt of DTPMP used. The builder used here is preferably HEDP from the class of phosphonates. The aminoalkanephosphonates also have a pronounced heavy metal binding capacity. Accordingly, in particular if the agents also contain bleach, it may be preferable to use aminoalkanephosphonates, in particular DTPMP, or to use mixtures of the phosphonates mentioned.

Particular preference is given to automatic dishwasher detergents which contain, as phosphonates, 1-hydroxyethane-1,1-diphosphonic acid (HEDP) or diethylene triamine penta (methylenephosphonic acid) (DTPMP). Of course, the machine according to the invention can

Dishwashing detergents contain two or more different phosphonates. The proportion by weight of the phosphonates in the total weight of automatic dishwashing agents according to the invention is preferably from 1 to 8% by weight, preferably from 1.2 to 6% by weight and in particular from 1.5 to 4% by weight.

By adding phosphonate, it was possible to further improve the coating properties of automatic dishwashing detergents according to the invention.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 5:

nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ether nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers Another group of organic builders are the polymeric sulfonates. Preferred polysulfonates contain, in addition to sulfonic acid-containing (s) monomer (s) at least one monomer from the group of unsaturated carboxylic acids.

As unsaturated carboxylic acid (s) is / are used with particular preference unsaturated carboxylic acids of the formula R (R ² ) C = C (R ³ ) COOH, in which R to R ³ independently of -H, - CH ₃ , a straight-chain or branched saturated alkyl radical having 2 to 12 carbon atoms, a straight-chain or branched, mono- or polyunsaturated alkenyl radical having 2 to 12 carbon atoms, alkyl or alkenyl radicals substituted by -NH ₂ , -OH or -COOH as defined above or -COOH or - COOR ⁴ , where R ^{4 is} a saturated or

unsaturated, straight-chain or branched hydrocarbon radical having 1 to 12

Carbon atoms.

Particularly preferred unsaturated carboxylic acids are acrylic acid, methacrylic acid, ethacrylic acid, oc-chloroacrylic acid, oc-cyanoacrylic acid, crotonic acid, oc-phenyl-acrylic acid, maleic acid,

Maleic anhydride, fumaric acid, itaconic acid, citraconic acid, methylenemalonic acid, sorbic acid, cinnamic acid or mixtures thereof. It goes without saying that it is also possible to use the unsaturated dicarboxylic acids.

In the case of the monomers containing sulfonic acid groups, preference is given to those of the formula R ⁵ (R ⁶ ) C =C (R ⁷ ) -X-SO ₃ H in which R ⁵ to R ⁷ independently of one another are -H, -CH ₃ , a straight-chain one or branched saturated alkyl radical having 2 to 12 carbon atoms, a straight-chain or branched, mono- or polyunsaturated alkenyl radical having 2 to 12 carbon atoms, with --NH ₂ , -OH or -COOH-substituted alkyl or alkenyl radicals or -COOH or -COOR ⁴ where R ^{4 is} a saturated or unsaturated, straight-chain or branched hydrocarbon radical having 1 to 12 carbon atoms, and X is an optional spacer group which is selected from - (CH ₂ ) _n - where n = 0 to 4, - COO- (CH ₂ ) _k - with k = 1 to 6, -C (O) -NH-C (CH ₃ ) ₂ -, - C (0) -NH-C (CH ₃ ) ₂ -CH ₂ - and -C (O) -NH-CH (CH ₂ CH ₃ ) -.

Preferred among these monomers are those of the formulas

H ₂ C = CH-X-SO ₃ H

H ₂ C = C (CH ₃ ) -X-SO ₃ H

H0 ₃ SX- (R ⁶ ) C = C (R ⁷ ) -X-S0 ₃ H, in which R ⁶ and R ^{7 are} independently selected from -H, -CH ₃ , - CH ₂ CH ₃ , -CH ₂ CH ₂ CH ₃ , -CH (CH ₃ ) ₂ and X is an optional spacer group which is selected from - (CH ₂ ) _n - with n = 0 to 4, -COO- (CH ₂ ) _k - with k = 1 to 6, -C (O) -NH-C (CH ₃ ) ₂ -, - C (O) -NH-C (CH ₃ ) ₂ -CH ₂ - and -C (O) -NH-CH (CH ₂ CH ₃ ) -.

Particularly preferred monomers containing sulfonic acid groups are 1-acrylamido-1-propanesulfonic acid, 2-acrylamido-2-propanesulfonic acid, 2-acrylamido-2-methyl-1-propanesulfonic acid, 2-methacrylamido-2-methylbenzylamine. 1-propanesulfonic acid, 3-methacrylamido-2-hydroxypropanesulfonic acid, allylsulfonic acid, methallylsulfonic acid, allyloxybenzenesulfonic acid, methallyloxybenzenesulfonic acid, 2-hydroxy-3- (2-propenyloxy) propanesulfonic acid, 2-methyl-2-propenylsulfonic acid, styrenesulfonic acid, vinylsulfonic acid, 3 -Sulfopropylacrylat, 3-sulfopropyl methacrylate, sulfomethacrylamide, sulfomethylmethacrylamide and mixtures of said acids or their water-soluble salts.

In the polymers, the sulfonic acid groups may be wholly or partially in neutralized form, i. the acidic acid of the sulfonic acid group in some or all sulfonic acid groups can be exchanged for metal ions, preferably alkali metal ions and in particular for sodium ions. The use of partially or fully neutralized

Sulfonsäuregruppenhaltigen copolymers is inventively preferred.

The monomer distribution of the polymeric sulfonates preferably used according to the invention in copolymers containing only monomers from the groups of the unsaturated carboxylic acids i) and the unsaturated sulfonic acids ii), preferably in each case 5 to 95 wt .-% i) or ii), particularly preferably 50 to 90% by weight of monomer from group ii) and from 10 to 50% by weight of monomer from group i), in each case based on the polymer.

The molar mass of the sulfo copolymers preferably used according to the invention can be varied in order to adapt the properties of the polymers to the desired end use. Preferred automatic dishwasher detergents are characterized in that the copolymers have molar masses of from 2000 to 200,000 gmol ¹ , preferably from 4000 to 25,000 gmol ¹ and in particular from 5000 to 15,000 gmol ^-1 .

In a further preferred embodiment, the polymeric sulfonates in addition to carboxyl-containing monomer and sulfonic acid-containing monomer further comprise at least one nonionic, preferably hydrophobic monomer. The use of these hydrophobically modified polymers has made it possible in particular to improve the rinse aid performance of automatic dishwashing detergents according to the invention. As nonionic monomers are preferably monomers of the general formula

R (R ² ) C = C (R ³ ) -XR ⁴ used, in which R to R ^{3 are} independently -H, -CH ₃ or -C ₂ H ₅ , X is an optional spacer group selected is from -CH ₂ -, -C (0) 0- and -C (0) -NH-, and R ^{4 is} a straight or branched chain saturated alkyl radical having 2 to 22 carbon atoms or an unsaturated, preferably aromatic radical having 6 to 22 carbon atoms.

Particularly preferred nonionic monomers are butene, isobutene, pentene, 3-methylbutene, 2-methylbutene, cyclopentene, hexene, hexene-1, 2-methylpentene-1, 3-methylpentene-1, cyclohexene, methylcyclopentene, cycloheptene, methylcyclohexene, 2,4 , 4-trimethylpentene-1, 2,4,4-trimethylpentene-2,3,3-dimethylhexene-1, 2,4-dimethylhexene-1, 2,5-dimethlyhexene-1,3,5-dimethylhexene-1,4 , 4-dimethylhexane-1, ethylcyclohexyn, 1-octene, oc-olefins having 10 or more carbon atoms such as 1-decene, 1-dodecene, 1-hexadecene, 1-octadecene and C22-olefin, 2-styrene, -methylstyrene , 3-methylstyrene, 4-propylstryol, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 1-vinylnaphthalene, 2, vinylnaphthalene, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, methyl methacrylate, N- (meth) Methyl) acrylamide, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, A / - (2-ethylhexyl) acrylamide,

Octyl acrylate, octyl methacrylate, A / - (octyl) acrylamide, acryloyl acrylate, acryloyl methacrylate, A / - (lauryl) acrylamide, a stearyl acrylate,

Methacrylic acid stearyl ester, A / (stearyl) acrylamide, behenyl acrylate,

Methacrylsäurebehenylester and A / - (behenyl) acrylamide or mixtures thereof.

Machine dishwashing detergent comprising at least one anionic copolymer

i) mono- or polyunsaturated monomers from the group of the carboxylic acids ii) mono- or polyunsaturated monomers from the group of the sulfonic acids iii) optionally further nonionic monomers

contained are preferred according to the invention. The proportion by weight of these polymers on

Total weight of the automatic dishwashing agent is preferably 2.0 to 20 wt .-%, preferably 2.5 to 15 wt .-% and in particular 2.5 to 10 wt .-%.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in Table 6 below:

Ingredient Recipe 1 Recipe 2 Recipe 3 Recipe 4

[Weight%] [weight%] [weight%] [weight%] anionic copolymer ^> 2.0 to 20 2.5 to 15 2.5 to 15 2.5 to 10 nonionic surfactant A 0 , 5 to 7.0 1.0 to 6.0 2.0 to 5.0 2.0 to 5.0 "

'Nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ethers

²⁾ nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ethers

³⁾ anionic copolymer comprising

Also suitable as co-builders are the homopolymers or copolymers of acrylic acid or methacrylic acid. Examples of such polymers are the alkali metal salts of polyacrylic acid or polymethacrylic acid, for example those having a molecular weight of 500 to 70,000 g / mol.

Suitable anionic polymers are, in particular, polyacrylates which preferably have a molecular weight of 2,000 to 20,000 g / mol. Because of their superior solubility, the short-chain polyacrylates, which have molar masses of from 2000 to 10000 g / mol, and particularly preferably from 3000 to 5000 g / mol, may again be preferred from this group.

Homopolymers of acrylic acid have been found to be particularly advantageous in reducing scale formation. Machine dishwashing detergents containing a homopolymer of acrylic acid are therefore preferred according to the invention.

Also suitable are copolymeric polycarboxylates, in particular those of acrylic acid with methacrylic acid and of acrylic acid or methacrylic acid with maleic acid. Copolymers of acrylic acid with maleic acid which contain 50 to 90% by weight of acrylic acid and 50 to 10% by weight of maleic acid have proven to be particularly suitable. Their relative molecular weight, based on free acids, is generally from 2000 to 70000 g / mol, preferably from 20,000 to 50,000 g / mol and in particular from 30,000 to 40,000 g / mol.

The content of preferred automatic dishwashing agents on (co) polymeric polycarboxylates is preferably 0.5 to 20% by weight and in particular 3 to 10% by weight, in each case based on the total weight of the automatic dishwashing detergent.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 7:

In addition to the nonionic surfactants and builders described above, the automatic dishwashing compositions according to the invention preferably contain further washing and cleaning-active ingredients, in particular active ingredients from the group of enzymes

Bleaching agents, bleach activators and bleach catalysts, glass corrosion inhibitors, corrosion inhibitors, fragrances or dyes.

As a further constituent dishwashing agents according to the invention may contain enzyme (s). These include in particular proteases, amylases, lipases, hemicellulases, cellulases, perhydrolases or oxidoreductases, and preferably mixtures thereof. These enzymes are basically of natural origin; Starting from the natural molecules, improved variants are available for use in detergents or cleaning agents, which are preferably used accordingly. Detergents or cleaning agents contain enzymes preferably in

Total amounts of 1 × 10 ^-6 to 5 wt .-% based on active protein. The protein concentration can be determined by known methods, for example the BCA method or the biuret method. Particularly preferred automatic dishwasher detergents also contain enzyme (s), preferably protease and / or amylase, in particular amylase.

Among the proteases, those of the subtilisin type are preferable. Examples of these are the subtilisins BPN 'and Carlsberg and their further developed forms, the protease PB92, the subtilisins 147 and 309, the alkaline protease from Bacillus lentus, subtilisin DY and the enzymes thermitase which can no longer be assigned to the subtilisins in the narrower sense, Proteinase K and the proteases TW3 and TW7.

Examples of amylases which can be used according to the invention are the amylases from Bacillus licheniformis, from β. amyloliquefaciens, from β. stearothermophilus, from Aspergillus niger and A. oryzae, as well as those improved for use in detergents and cleaners

Further developments of the aforementioned amylases. Furthermore, for this purpose the Bacillus sp. A 7-7 (DSM 12368) and cyclodextrin glucanotransferase (CGTase) from β. agaradherens (DSM 9948). Also usable according to the invention are lipases or cutinases, in particular because of their triglyceride-splitting activities, but also in order to generate in situ peracids from suitable precursors. These include, for example, those originally from Humicola lanuginosa

(Thermomyces lanuginosus) available, or further developed lipases, especially those with the amino acid exchange D96L.

Furthermore, enzymes can be used which are termed hemicellulases

be summarized. These include, for example, mannanases, xanthan lyases, pectin lyases (= pectinases), pectin esterases, pectate lyases, xyloglucanases (= xylanases), pullulanases and β-glucanases.

Oxidoreductases, for example oxidases, oxygenases, catalases, peroxidases, such as halo, chloro, bromo, lignin, glucose or manganese peroxidases, dioxygenases or laccases (phenol oxidases, polyphenol oxidases) can be used according to the invention to increase the bleaching effect. Advantageously, it is additionally preferable to add organic, more preferably aromatic, enzyme-interacting compounds to enhance the activity of the respective oxidoreductases (enhancers) or to react at greatly varying redox potentials between the oxidizing enzymes and the

Stains to ensure the flow of electrons (mediators).

A preferred machine dishwashing detergent according to the invention is characterized in that the dishwashing detergent, based on its total weight,

Enzyme preparation (s) in amounts of 0, 1 to 12 wt .-%, preferably from 0.2 to 10 wt .-% and in particular from 0.5 to 8 wt .-%.

A protein and / or enzyme may be particularly protected during storage against damage such as inactivation, denaturation or degradation, such as by physical influences, oxidation or proteolytic cleavage. In microbial recovery of proteins and / or enzymes, inhibition of proteolysis is particularly preferred, especially if the agents also contain proteases. Detergents may contain stabilizers for this purpose; the provision of such means constitutes a preferred embodiment of the present invention.

Washing or cleaning-active proteases and amylases are generally not provided in the form of the pure protein but rather in the form of stabilized, storable and transportable preparations. These prefabricated preparations include, for example, the solid preparations obtained by granulation, extrusion or lyophilization or, in particular in the case of liquid or gel-form detergents, solutions of the enzymes, preferably as concentrated as possible, sparingly mixed with water and / or with stabilizers or other auxiliaries.

As can be seen from the previous statements, the enzyme protein forms only a fraction of the total weight of conventional enzyme preparations. Protease and amylase preparations preferably used according to the invention contain between 0.1 and 40% by weight, preferably between 0.2 and 30% by weight, more preferably between 0.4 and 20% by weight and

in particular between 0.8 and 10% by weight of the enzyme protein.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in Table 8 below:

Machine dishwashing detergents according to the invention may contain a bleaching agent as further constituent, with oxygen bleaches being preferred. Among the compounds which serve as bleaches and deliver in water H ₂ O ₂ , the sodium percarbonate, the

Sodium perborate tetrahydrate and sodium perborate monohydrate are of particular importance. Other useful bleaching agents are, for example, peroxypyrophosphates, citrate perhydrates and peracid salts or peracids which yield H ₂ O ₂ , such as perbenzoates, peroxophthalates, diperazelaic acid, phthaloiminoperacid or diperdodecanedioic acid.

Furthermore, bleaching agents from the group of organic bleaching agents can also be used. Typical organic bleaching agents are the diacyl peroxides, e.g. Dibenzoyl. Other typical organic bleaches are the peroxyacids, examples of which include the alkyl peroxyacids and the aryl peroxyacids.

Preferred automatic dishwashing agents according to the invention are characterized in that they contain an oxygen bleaching agent, preferably sodium percarbonate, more preferably a coated sodium percarbonate. The weight fraction of the bleaching agent, based on the total weight of the washing or cleaning agent, is in preferred Embodiments between 2.0 and 30 wt .-%, preferably between 4.0 and 20 wt .-% and in particular between 6.0 and 15 wt .-%.

Some exemplary formulations for preferred phosphate-free automatic dishwasher detergents according to the invention can be found in Table 9 below:

As bleach activators, the dishwasher detergents according to the invention can be used

Bleach activators included. These compounds give under perhydrolysis aliphatic peroxycarboxylic acids having preferably 1 to 10 carbon atoms, in particular 2 to 4 carbon atoms, and / or optionally substituted perbenzoic acid. Suitable substances are those which carry O- and / or N-acyl groups of the stated carbon atom number and / or optionally substituted benzoyl groups. Preference is given to polyethylenated diamylenes which have been alkylated several times, tetraacetylethylenediamine (TAED) having proven to be particularly suitable.

Automatic dishwashing detergent, characterized in that it is a bleach activator bleach activator from the group of acetylated amines, preferably tetraacetylenediamine (TAED), are preferred according to the invention. These bleach activators, in particular TAED, are preferably used in amounts of up to 10% by weight, in particular 0.1% by weight to 10% by weight, especially 0.5 to 8% by weight and more preferably 1, 0 to 6 Wt .-%, used.

In addition or as an alternative to the conventional bleach activators, the

Machine dishwashing detergents according to the invention preferably at least one

Bleach catalyst. These substances are bleach-enhancing transition metal salts or transition metal complexes such as, for example, Mn, Fe, Co, Ru or Mo saline complexes or carbonyl complexes. Mn, Fe, Co, Ru, Mo, Ti, V and Cu complexes with N-containing tripod ligands and Co, Fe, Cu and Ru ammine complexes can also be used as bleach catalysts.

With particular preference, complexes of manganese in the oxidation state II, III, IV or IV are used, which preferably contain one or more macrocyclic ligand (s) with the

Donor functions N, NR, PR, O and / or S included. Preferably, ligands are used, having the nitrogen donor functions. It is particularly preferred to use bleach catalyst (s) in the compositions of the invention, which as macromolecular ligands 1, 4,7-trimethyl-1, 4,7-triazacyclononan (Me-TACN), 1, 4,7-triazacyclononane (TACN ), 1, 5,9-trimethyl-1, 5,9-triazacyclododecane (Me-TACD), 2-methyl-1, 4,7-trimethyl-1, 4,7-triazacyclononane (Me / Me-TACN) and or 2-methyl-1, 4,7-triazacyclononane (Me / TACN). suitable

Manganese complexes are, for example, [Μη '^ (μ-0) ι (μ-ω) 2 (ΤΑΟΝ) 2] (ΟΙ0 ₄ ) 2, [Μη "' Μη ' ^ν (μ-0) ₂ (μ-OAc) ₁ ( TACN) ₂ ] (BPh ₄ ) ₂ , ^[Μη ι _"2 (μ-0) ₁ (μ-ΟΑϋ) ^{(β Μ -ΤΑΟΝ)} ₂ _2] (ΟΙ0 ₄₎ 2, [Μη" ^{^ι} Μη ^ιν (μ-0) ₁ (μ-ΟΑϋ) ₂ ( Μ ^β -ΤΑΟΝ) ₂ ] (ΟΙ0 ₄ ) 3, [Μη ' ^ν ₂ (μ-0) ₃ (Μ ^β -ΤΑΟΝ) ₂ ] (ΡΡ ₆ ) ₂ and [Μη' ^ν ₂ (μ-0) ₃ ( Me / Me-TACN) ₂ ] (PF ₆ ) ₂ (OAc = OC (0) CH ₃ ).

Automatic dishwashing detergent, characterized in that it further comprises a

Bleach catalyst selected from the group of bleach-enhancing transition metal salts and transition metal complexes, preferably from the group of complexes of manganese with 1, 4,7-trimethyl-1, 4,7-triazacyclononane (Me ₃ -TACN) or 1, 2, 4,7- tetramethyl-1, 4,7-triazacyclononane (Me ₄ -TACN) are preferred according to the invention, as by the aforementioned

Bleaching catalysts, in particular the cleaning result can be significantly improved.

The abovementioned bleach-enhancing transition metal complexes, in particular with the central atoms Mn and Co, are used in customary amounts, preferably in an amount of up to 5% by weight, in particular of 0.0025% by weight to 1% by weight and more preferably of 0, 01 wt .-% to 0.30 wt .-%, each based on the total weight of

bleach catalyst-containing agent used. In special cases, however, more can be done

Bleaching catalyst can be used.

Some exemplary formulations for particularly preferred phosphate-free automatic dishwasher detergents according to the invention can be found in the following Table 10:

⁾ nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) i ₀ -3o-2-hydroxyalkyl ethers

²⁾ nonionic surfactant of the general formula C ₄ . ₂ 2 fatty alcohol (EO) ₄₀ -8o-2-hydroxyalkyl ether

³⁾ anionic copolymer comprising

The automatic dishwasher detergents according to the invention can be present in the ready-to-use form known to the person skilled in the art, that is to say, for example, in solid or liquid form but also as a combination of solid and liquid supply forms.

As solid offer forms are particularly suitable powders, granules, extrudates or

Compactates, in particular tablets. The liquid supply forms based on water and / or organic solvents may be thickened, in the form of gels.

If they are formulated in liquid form, preferred automatic dishwasher detergents according to the invention contain, based on their total weight, a water content of preferably 20 to 70% by weight, preferably 30 and 60% by weight and in particular 35 and 55% by weight.

Inventive agents can be formulated as single-phase or multi-phase products. In particular, automatic dishwashing detergents with one, two, three or four phases are preferred. Machine dishwashing detergents, characterized in that they are in the form of a prefabricated dosing unit with two or more phases, are particularly preferred.

The individual phases of multiphasic agents may be the same or different

Have aggregate states. Machine dishwashing detergents which have at least two different solid phases and / or at least two liquid phases and / or at least one solid and at least one liquid phase are preferred. Especially preferred are two- or more-phase tablets, for example

Two-layer tablets, in particular two-layer tablets with a trough and a molded body located in the trough.

Automatic dishwashing agents preferred according to the invention are in the form of a tablet, preferably in the form of a multilayer tablet.

Automatic dishwasher detergents according to the invention are preferably prefabricated to form metering units. These metering units preferably comprise those for a cleaning cycle necessary amount of washing or cleaning substances. Preferred metering units have a weight between 12 and 30 g, preferably between 14 and 26 g and in particular between 15 and 22 g.

The volume of the aforementioned metering units and their spatial form are selected with particular preference so that a metering of the prefabricated units on the

Dosing of a dishwasher is guaranteed. The volume of the dosing unit is therefore preferably between 10 and 35 ml, preferably between 12 and 30 ml and in particular between 15 and 25 ml.

The automatic dishwasher detergents according to the invention, in particular the prefabricated metering units, have a water-soluble coating, with particular preference.

In order to facilitate the disintegration of preformed moldings, it is possible to incorporate disintegration aids, so-called tablet disintegrants, into these compositions in order to shorten the disintegration times.

These substances, which are also referred to as "explosives" due to their effect, increase their volume upon ingress of water, on the one hand increasing the intrinsic volume (swelling), and on the other hand creating a pressure via the release of gases which can break the tablet into smaller particles disintegrates. Well-known disintegration aids are

For example, carbonate citric acid systems, although other organic acids can be used. Swelling disintegration aids are, for example, synthetic polymers such as polyvinylpyrrolidone (PVP) or natural polymers or modified natural substances such as cellulose and starch and their derivatives, alginates or casein derivatives.

Preference is given to using disintegration aids in amounts of from 0.5 to 10% by weight, preferably from 3 to 7% by weight and in particular from 4 to 6% by weight, based in each case on the total weight of the disintegration assistant-containing agent.

Disintegrating agents based on cellulose are used as preferred disintegrating agents, so that preferred washing or cleaning agents comprise such a disintegrating agent

Cellulose base in amounts of 0.5 to 10 wt .-%, preferably 3 to 7 wt .-% and in particular 4 to 6 wt .-%. The cellulose used as a disintegration aid is preferably not used in finely divided form, but converted into a coarser form, for example granulated or compacted, before it is added to the premixes to be tabletted. The particle sizes of such disintegrating agents are generally above 200 μιτι, preferably at least 90 wt .-% between 300 and 1600 μιτι and in particular at least 90 wt .-% between 400 and 1200 μιτι. Preferred disintegration aids, preferably a disintegration aid based on cellulose, preferably in granular, cogranulated or compacted form, are present in the disintegrating agent-containing agents in amounts of from 0.5 to 10% by weight, preferably from 3 to 7% by weight and in particular from 4 to 6 wt .-%, each based on the total weight of the disintegrating agent-containing agent.

Furthermore, according to the invention, gas-evolving effervescent systems can furthermore be used as tablet disintegration auxiliaries. However, preferred effervescent systems consist of at least two components which react with one another to form gas, for example alkali metal carbonate and / or bicarbonate and an acidifying agent which is suitable for liberating carbon dioxide from the alkali metal salts in aqueous solution. One

Acidifiers which release carbon dioxide from the alkali salts in aqueous solution are, for example, citric acid.

The active substance combinations described above are particularly suitable for cleaning dishes in automatic dishwashing processes. Another object of the present application is a method for cleaning dishes in a dishwasher, using a machine dishwashing agent according to the invention, wherein the automatic dishwashing detergent preferably metered during the passage of a dishwasher, before the main wash cycle or during the main wash cycle in the interior of a dishwasher become. The dosing or the entry of

agent according to the invention in the interior of the dishwasher can be done manually, but preferably the agent is metered by means of the metering chamber of the dishwasher in the interior of the dishwasher. In the course of the cleaning process preferably no additional water softener and no additional rinse aid is metered into the interior of the dishwasher. A kit for a dishwasher, comprising

a) a machine dishwashing detergent according to the invention;

(b) instructions instructing the consumer to use the automatic dishwashing detergent without the addition of a rinse aid and / or a softening salt are another subject of this application.

The dishwasher detergents according to the invention exhibit their advantageous cleaning and drying properties, in particular also in low-temperature cleaning processes.

Preferred dishwashing processes using agents according to the invention are therefore characterized in that the dishwashing processes are carried out at a liquor temperature below 60 ° C., preferably below 50 ° C.

As described at the outset, compositions according to the invention are distinguished from conventional automatic dishwashing compositions by reduced deposit formation. The use of a A machine dishwashing agent according to the invention for reducing the formation of deposits on glass surfaces in automatic dishwashing is a further subject matter of the present application.

Claims

claims

1. Builder-containing, phosphate-free automatic dishwashing detergent containing, in each case based on the total weight of the automatic dishwashing detergent

a) from 0.5 to 7.0% by weight of nonionic surfactant A,

b) 0.2 to 5.0 wt .-% of nonionic surfactant B having a melting point above 25 ° C, characterized in that the nonionic surfactant A has a melting point which is at least 5 ° C below the melting point of the nonionic surfactant B.

2. Machine dishwashing detergents according to claim 1, characterized in that the automatic dishwashing agent disuccinate at least one builder from the group of organic complexing agent, preferably at least an organic complexing agent from the group of citrate, ethylenediamine-N, N ^'disuccinic acid (EDDS) and phosphonate.

3. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the automatic dishwashing agent further comprises at least one anionic copolymer comprising

i) unsaturated carboxylic acids,

ii) monomers containing sulfonic acid groups,

iii) optionally further nonionic monomers

contains.

4. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the automatic dishwashing agent further comprises a homopolymer of the acrylic acid.

5. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the automatic dishwashing agent contains carbonate, wherein the

Weight fraction of the carbonate in the total weight of the automatic dishwashing agent is preferably between 5 and 50 wt .-%, preferably between 10 and 45 wt .-% and in particular between 15 and 40 wt.%.

6. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that both nonionic surfactants A and B have a melting point above 25 ° C.

7. Machine dishwashing detergent according to one of the preceding claims, characterized

in that the proportion by weight of nonionic surfactant A in the total amount of nonionic surfactants A and B is between 50 and 95 wt .-%, preferably between 55 and 90 wt .-% and in particular between 60 and 80 wt .-%.

8. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the weight fraction of the nonionic surfactant A in the total weight of the automatic dishwashing agent is between 1, 0 and 6.0 wt .-% and in particular between 2.0 and 5.0 wt .-%.

9. Machine dishwashing detergent according to one of the preceding claims, characterized

in that the weight fraction of the nonionic surfactant B in the total weight of the automatic dishwashing agent is between 0.5 and 4.0% by weight and in particular between 1.0 and 3.0% by weight.

10. Machine dishwashing detergent according to one of the preceding claims, characterized

in that at least one of the nonionic surfactants A and B has the general formula R -CH (OH) CH ₂ O- (AO) _w - (A'O) _x - (A "O) _y - (A" O) _z - R ² , in the

R and R ² are a C ₂ -26 alkyl;

A, Α ', A "and A'" independently represent a radical from the group

CH (CH ₂ -CH ₃ ) - stand,

1 1. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the automatic dishwashing agent further contains enzyme (s), preferably amylase.

12. Machine dishwashing detergent according to one of the preceding claims, characterized

characterized in that the automatic dishwashing agent is in the form of a tablet, preferably in the form of a multilayer tablet.

13. A method for cleaning dishes in a dishwasher, using automatic dishwashing detergent according to one of claims 1 to 12.

14. The method according to claim 13, characterized in that in the course of

Cleaning method no additional water softener and no additional rinse aid is dosed into the interior of the dishwasher.

15. Use of a dishwasher detergent according to one of claims 1 to reduce the formation of deposits on glass surfaces in automatic dishwashing.