EP3670637A1 - Viscosity regulation in handwash agents - Google Patents

Abstract

The invention relates to amine oxide-containing hand dishwashing detergents comprising at least one anionic surfactant; and at least one amine oxide surfactant, the amount of amine oxide surfactant being at least 20% by weight of the total amount of surfactant, and the composition having a viscosity factor of 0.1 to 50 mPas.

Description

The present invention relates to a special surfactant composition for improving the physical properties of a cleaning agent, in particular a hand washing agent. In addition, the present invention also relates to the use of such a cleaning agent for cleaning solid surfaces, in particular dishes.

There is a high demand for liquid detergents, in particular hand dishwashing detergents, since these are easier to use and to dose than solid detergents. Liquid cleaning agents are usually offered in dosing bottles. The viscosity of such agents is extremely important: if detergents are too viscous, dosing is difficult. Detergent residues are often left behind in the dosing bottle because they cannot be completely removed from the bottle due to the high viscosity of the detergent. Furthermore, highly viscous cleaning agents are more slowly soluble in water and are therefore less suitable for use as hand dishwashing detergents. The viscosity of the agents can be reduced by increasing the solvent content. As a rule, however, this goes hand in hand with a reduction in cleaning performance and more complex and expensive production processes, since additional solvents have to be added.

The object of the present invention was therefore to identify surfactant combinations for hand dishwashing detergents which have good cleaning performance and which can be dosed simply and completely. Furthermore, despite these advantageous properties, the cleaning agent should be simple and cost-effective to produce.

This object on which the present application is based is achieved according to the invention by a hand dishwashing detergent containing amine oxide, comprising at least one anionic surfactant and at least one amine oxide surfactant, the amount of amine oxide surfactant being 10% by weight to 50% by weight of the total amount of surfactant, and the composition preferably has a viscosity factor of 0.1 to 50 mPas.

The inventors have surprisingly discovered that in the case of surfactant combinations with amine oxides, the viscosity has a particularly strong dependence on the pH, provided that there are slightly acidic to preferably alkaline pH values. The viscosity factor (V) can be determined using the relationship V = viscosity [mPa * s] / pH / 100. The viscosity factor reflects the interplay between pH and viscosity.

According to the invention, the viscosity of liquids is measured at 20 ° C. using a Brookfield DV-II + Pro Viscometer with spindle 31, at 0.6 rpm.

In a further aspect, the present invention is also directed to the use of a cleaning agent, preferably dishwashing agent, particularly preferably hand dishwashing agent, as described herein, for cleaning solid surfaces, and to a method for cleaning hard surfaces, characterized in that in at least one process step a cleaning agent as described here, preferably dishwashing agent, particularly preferably hand dishwashing agent, is used.

Finally, the invention also relates to the use of the surfactant combinations described here for improving the washing performance of a dishwashing detergent, preferably hand dishwashing detergent.

If the total amount ratio of amine oxide to total amount of surfactant is used in connection with the invention, it should be noted that the amine oxide is to be added as a nonionic surfactant to the total amount of surfactant.

"At least one" as used herein includes, but is not limited to, 1, 2, 3, 4, 5, 6 and more.

Unless explicitly stated otherwise, all percentages given in connection with the compositions described herein relate to% by weight, in each case based on the mixture in question.

In the context of the present invention, unless otherwise stated, fatty acids or fatty alcohols or their derivatives are representative of branched or unbranched carboxylic acids or alcohols or their derivatives with preferably 6 to 22 carbon atoms. In particular, the oxo alcohols or their derivatives obtainable, for example, according to ROELEN's oxo synthesis can also be used accordingly.

Whenever alkaline earth metals are mentioned in the following as counterions for monovalent anions, this means that the alkaline earth metal is naturally only present in half the amount of the substance - sufficient to balance the charge - like the anion.

According to the invention, a cleaning agent is understood to mean all agents which are suitable for cleaning solid surfaces, such as dishwashing agents, in particular hand dishwashing agents. Other suitable ingredients are described in detail below.

According to a preferred embodiment, a hand dishwashing detergent is described, the hand dishwashing detergent not comprising betaines. Because of the absence of an amphoteric surfactant, the hand dishwashing detergents according to this embodiment are easier and more cost-effective to produce than a multicomponent surfactant system with betaine, without the cleaning performance being reduced by not using an amphoteric surfactant. It is believed that the absence of betaines advantageously reduces the viscosity.

According to a preferred embodiment, a hand dishwashing detergent is described, the amount of amine oxide surfactant being 20% by weight to 30% by weight of the total amount of surfactant.

The inventors surprisingly discovered that in the case of surfactant combinations with amine oxides, the viscosity has a particularly strong dependence on the pH, provided that the pH values are slightly acidic to alkaline. According to a preferred embodiment, a hand dishwashing detergent is therefore described, the pH being 6 to 10. According to a preferred embodiment, a hand dishwashing detergent is described, the pH being 6 to 9. According to a preferred embodiment, a hand dishwashing detergent is described, the pH being 7 to 9. According to a further preferred embodiment, a hand dishwashing detergent is described, the pH being 7 to 8.5, and more preferably 7 to 8. Also preferred is a pH of about 7.5. The pH ranges mentioned are preferred because the enzymes used, in particular protease and / or amylases, can be stabilized particularly effectively. On the other hand, these pH values are critical in the compositions with amine oxides known from the prior art, since the viscosity values increase considerably.

The composition preferably comprises one or more anionic surfactants in a total amount of from 3% by weight to 60% by weight, more preferably from 3% by weight to 40% by weight, and more preferably from 10% by weight up to 35% by weight.
According to a preferred embodiment, a hand dishwashing detergent is described, the anionic surfactant being an alkoxylated anionic surfactant, preferably with a degree of alkoxylation of more than 1.75 and more preferably more than 1.75 and less than 3 and even more preferably 2 anionic surfactant more preferably an ether sulfate, the ether sulfate being still more preferably lauryl ether sulfate.

According to a preferred embodiment, a hand dishwashing detergent is described, the hand dishwashing detergent comprising only the at least one anionic surfactant and the at least one amine oxide as surfactants. The hand dishwashing detergents according to this embodiment are easier and more cost-effective to produce than multicomponent surfactant systems because there is no need for further surfactants, such as amphoteric surfactants, without reducing the cleaning performance.

According to a preferred embodiment, a hand dishwashing detergent is described, the hand dishwashing detergent comprising only an ether sulfate and an amine oxide as surfactants. Such ether sulfates are particularly preferred anionic surfactants in combination with amine oxides, especially if amphoteric surfactants are not used.

According to a preferred embodiment, a hand dishwashing detergent is described, the hand dishwashing detergent containing a hydrotropic agent, the hydrotropic agent preferably comprising sodium cumene sulfonate.

According to a preferred embodiment, a hand dishwashing detergent is described, the hand dishwashing detergent having a viscosity factor of 0.2 to 30 mPas. The viscosity factor reflects the interplay of pH and viscosity, which is given by the composition according to the invention in the present case.

These and other aspects, features and advantages of the invention will become apparent to those skilled in the art upon studying the following detailed description and claims. Each feature from one aspect of the invention can be used in any other aspect of the invention. Furthermore, it goes without saying that the examples contained herein are intended to describe and illustrate the invention, but not to limit it, and in particular the invention is not restricted to these examples. Numerical ranges that are specified in the format "from x to y" include the values mentioned. If several preferred numerical ranges are specified in this format, it goes without saying that all ranges that result from the combination of the different endpoints are also covered.

The cleaning agent according to the invention contains at least one amine oxide. In principle, all amine oxides established for this purpose in the prior art, that is to say compounds which have the formula R ¹ R ² R ³ NO, in which each R ¹ , R ² and R ^3, independently of the others, is an optionally substituted, for example hydroxy, substituted, C ₁ -C ₃₀ hydrocarbon chain can be used. Amine oxides used with particular preference are those in which R ¹ C ₁₂ -C ₁₈ alkyl and R ² and R ^{3 are} each independently C ₁ -C ₄ alkyl, in particular C ₁₂ -C ₁₈ alkyldimethylamine oxides. Exemplary representatives of suitable amine oxides are N-coconut alkyl-N, N-dimethylamine oxide and N-tallow alkyl-N, N-dihydroxyethylamine oxide. C ₁₂ -C ₁₈ alkyldimethylamine oxides or mixtures which also contain C ₁₆ and C ₁₈ alkyldimethylamine oxides are preferred over C ₁₂ -C ₁₄ alkyldimethylamine oxides. In the same way, amine oxides in which R ¹ also comprises C ₁₆ and C ₁₈ radicals are generally preferred over those in which R ¹ only comprises C _12-14 radicals. In various embodiments, the amine oxides used therefore contain at least 20% by weight, preferably at least 30% by weight, more preferably at least 40% by weight, most preferably at least 50% by weight, 60% by weight, 70% by weight. -% or 80 wt .-% C _16-18 amine oxides based on the Total weight of the amine oxides. In such embodiments, a further residue of the amine oxides can consist of C _12-14 amine oxides. It has been shown that such long-chain amine oxides are superior to the shorter-chain ones in terms of cleaning performance, in particular in the surfactant combination described.

The cleaning agents of the invention further contain at least one anionic surfactant from the group of ether sulfates. Preferred ether sulfates are those of the formula (I)

R ¹ -O- (AO) _n -SO ₃ ^- X ⁺ (I).

In this formula (I), R ^{1 represents} a linear or branched, substituted or unsubstituted alkyl radical, preferably a linear, unsubstituted alkyl radical, particularly preferably a fatty alcohol radical. Preferred R ¹ radicals are selected from decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl radicals and mixtures thereof, the representatives having an even number of C - Atoms are preferred. Particularly preferred R ¹ radicals are derived from C ₁₂ -C ₁₈ fatty alcohols, for example from coconut fatty alcohol, tallow fatty alcohol, lauryl, myristyl, cetyl or stearyl alcohol or from C ₁₀ -C ₂₀ oxo alcohols. X stands for a monovalent cation or the nth part of an n-valent cation, preference being given to the alkali metal ions and among them Na ⁺ or K ⁺ , Na ^{+ being} extremely preferred. Further cations X ⁺ can be selected from NH4 ⁺ , ½ Zn ²⁺ , ½ Mg ²⁺ , ½ Ca ²⁺ , ½ Mn ²⁺ , and mixtures thereof.

AO stands for an ethylene oxide (EO) or propylene oxide (PO) group, preferably for an ethylene oxide group. The index n stands for an integer from 1 to 50, preferably from 1 to 20 and in particular from 2 to 10. Very particularly preferably n stands for the numbers 2, 3, 4, 5, 6, 7 or 8.

Fatty alcohol ether sulfates of the formula I-1 are preferred

mit k = 11 bis 19, n = 2, 3, 4, 5, 6, 7 oder 8. Besonders bevorzugte Vertreter sind Na-C_12-14 Fettalkoholethersulfate mit 2 EO (k = 11-13, n = 2 in Formel II-1).

with k = 11 to 19, n = 2, 3, 4, 5, 6, 7 or 8. Particularly preferred representatives are Na-C _12-14 fatty alcohol _ether sulfates with 2 EO (k = 11-13, n = 2 in formula II -1).

Although not preferred, other surfactants can be used in the compositions of the invention in addition to the above. For example, surfactants from the groups of alkylbenzenesulfonates, alkylsulfates, alkyl ester sulfonates, secondary alkanesulfonates, fatty alcohol alkoxylates, alkyl glycosides, alkoxylated fatty acid alkyl esters, fatty acid alkanolamides are suitable, Hydroxy mixed ethers, sorbitan fatty acid esters, polyhydroxy fatty acid amides and alkoxylated alcohols. Such surfactants are known in the prior art. According to the invention, however, preference is given to a surfactant system which is formed from only two surfactants and is thereby free from betaines.

In one embodiment, the cleaning agents according to the present invention are liquid and contain water as the main solvent, i.e. it is an aqueous cleaning agent. The water content of the aqueous composition according to the invention is usually 15 to 95% by weight, preferably 20 to 90% by weight. In various embodiments, the water content is more than 5% by weight, preferably more than 15% by weight and particularly preferably more than 25% by weight, in each case based on the total amount of cleaning agent.

In addition, non-aqueous solvents can be added to the cleaning agent. Suitable non-aqueous solvents include monohydric or polyhydric alcohols, alkanolamines or glycol ethers, provided that they are miscible with water in the specified concentration range. The solvents are preferably selected from ethanol, n-propanol, i-propanol, butanols, glycol, propanediol, butanediol, methylpropanediol, glycerol, diglycol, propyldiglycol, butyldiglycol, hexylene glycol, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol propyl ether, ethylene glycol monoethyl n-butyl butyl Diethylene glycol ethyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol propyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, methoxytriglycol, ethoxytriglycol, butoxytriglycol, 1-butoxyethoxy-2-propanol, 3-methyl-3-n-methoxybutyl, mixtures thereof, Solvent.

The one or more non-aqueous solvents are usually contained in an amount of 0.1 to 10% by weight, preferably 1 to 8% by weight, based on the total composition.

In various embodiments, the agents described herein can furthermore contain at least one enzyme, preferably a protease. The proteases used are preferably alkaline serine proteases. They act as non-specific endopeptidases, which means that they hydrolyze any acid amide bonds that are inside peptides or proteins and thus cause protein-containing soiling to be broken down on the items to be cleaned. Their pH optimum is usually in the clearly alkaline range.

• der Alkalischen Protease aus Bacillus amyloliquefaciens (BPN'),
• der Alkalischen Protease aus Bacillus licheniformis (Subtilisin Carlsberg),
• der Alkalischen Protease PB92,
• Subtilisin 147 und/oder 309 (Savinase)
• der Alkalischen Protease aus Bacillus lentus, vorzugsweise aus Bacillus lentus (DSM 5483),
• der Alkalischen Protease aus Bacillus alcalophilus (DSM 11233),
• der Alkalischen Protease aus Bacillus gibsonii (DSM 14391) oder einer hierzu mindestens zu 70% identischen Alkalischen Protease,
• der Alkalischen Protease aus Bacillus sp. (DSM 14390) oder einer hierzu mindestens zu 98,5% identischen Alkalischen Protease, und
• der Alkalischen Protease aus Bacillus sp. (DSM 14392) oder einer hierzu mindestens zu 98,1 % identischen Alkalischen Protease.

The proteases preferably used according to the invention are preferably a serine protease, in particular a subtilase, particularly preferably a subtilisin. The subtilisin can be a wild-type enzyme or a subtilisin variant, the wild-type enzyme or the starting enzyme of the variant preferably being selected from one of the following:

• the alkaline protease from Bacillus amyloliquefaciens (BPN '),
• the alkaline protease from Bacillus licheniformis (subtilisin Carlsberg),
• the alkaline protease PB92,
• Subtilisin 147 and / or 309 (Savinase)
• the alkaline protease from Bacillus lentus, preferably from Bacillus lentus (DSM 5483),
• the alkaline protease from Bacillus alcalophilus (DSM 11233),
• the alkaline protease from Bacillus gibsonii (DSM 14391) or an alkaline protease which is at least 70% identical to this,
• the alkaline protease from Bacillus sp. (DSM 14390) or an alkaline protease which is at least 98.5% identical to it, and
• the alkaline protease from Bacillus sp. (DSM 14392) or an alkaline protease which is at least 98.1% identical to this.

Examples of the proteases which can be used in the agents described here are Subtilisin 309 or functional fragments / variants thereof and variants of the alkaline protease from Bacillus lentus or variants thereof. Subtilisin 309 is sold under the trade name Savinase® by Novozymes A / S, Bagsvaerd, Denmark. Enzyme variants of the subtilisin 309 from Bacillus lentus are available under the trade names Blaze® and Ovozyme® from Novozymes and represent a preferred embodiment of the invention. The protease variants known as BLAP® are derived from the alkaline protease from Bacillus lentus DSM 5483, for example. Preferred protease variants are those which, compared to the BLAP wt (wild-type) enzyme, in the BLAP wt count, have at least one mutation on R99, in particular R99E or R99D, particularly preferred is R99E, and optionally additionally at least one or two , preferably all three of the amino acid substitutions S3T, V4l and V199l, particularly preferred are the BLAP variants as described in SeqlD No 4 or 5 of the WO2014 / 177430 are described.

In the cleaning agents described herein, the enzymes to be used can also be packaged together with accompanying substances, for example from fermentation. In liquid formulations, the enzymes are preferably used as enzyme liquid formulation (s).

The proteases 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, particularly in the case of liquid or gel form agents, solutions of the enzymes, advantageously as concentrated as possible, low in water and / or mixed with stabilizers or other auxiliaries.

Alternatively, the enzymes can be encapsulated both for the solid and for the liquid dosage form, for example by spray drying or extrusion of the enzyme solution together with a preferably natural polymer or in the form of capsules, for example those in which the enzymes are enclosed as in a solidified gel or those of the core-shell type, in which an enzyme-containing core is coated with a protective layer impermeable to water, air and / or chemicals. Additional active ingredients, for example stabilizers, emulsifiers, pigments, bleaching agents or dyes, can additionally be applied in superimposed layers. Capsules of this type are applied by methods known per se, for example by shaking or roll granulation or in fluid-bed processes. Such granules are advantageously low in dust, for example by applying polymeric film formers, and are stable on storage due to the coating.

Furthermore, it is possible to assemble two or more enzymes together, so that a single granulate has several enzyme activities.

In addition to the at least one protease, cleaning agents according to the invention can contain one or more further enzymes, in particular from the following group: amylases, hemicellulases, cellulases, lipases and oxidoreductases.

The amylase (s) is preferably an α-amylase. The hemicellulase is preferably a β-glucanase, a pectinase, a pullulanase and / or a mannanase. The cellulase is preferably a cellulase mixture or a one-component cellulase, preferably or predominantly an endoglucanase and / or a cellobiohydrolase. The oxidoreductase is preferably an oxidase, in particular a choline oxidase, or a perhydrolase. The enzymes mentioned can all be made up as described above for the proteases.

In cleaning agents according to the invention, which in one embodiment are present in predominantly liquid, pasty or gel form, the at least one enzyme, preferably the at least one protease in an amount of 0.01-1.6% by weight, preferably 0.08-1 , 2 wt .-% based on the total weight of the cleaning agent contained in this.

In various embodiments, the enzyme (s) can be pre-formulated with enzyme stabilizers in an enzyme composition. The enzyme protein usually forms only a fraction of the total weight of the enzyme preparation. Enzyme preparations used with preference contain between 0.1 and 40% by weight, preferably between 0.2 and 30% by weight, particularly preferably between 0.4 and 20% by weight and in particular between 0.8 and 10% by weight. % of the enzyme protein. In such compositions, an enzyme stabilizer can be used in an amount of 0.05-35% by weight, preferably 0.05-10% by weight, based on the total weight. be contained in the enzyme composition. This enzyme composition can then be used in cleaning agents according to the invention in amounts that lead to the above-mentioned final concentrations in the cleaning agent. Suitable enzyme stabilizers are known in the prior art. In various embodiments, the agent according to the invention can accordingly additionally have one or more enzyme stabilizers.

The protein concentration can be determined using known methods, for example the BCA method (bicinchoninic acid; 2,2'-bichinolyl-4,4'-dicarboxylic acid) or the biuret method. In this regard, the active protein concentration is determined by titrating the active centers using a suitable irreversible inhibitor (for proteases, for example, phenylmethylsulfonyl fluoride (PMSF)) and determining the residual activity (cf. M. Bender et al., J. Am. Chem. Soc. 88, 24 (1966), pp. 5890-5913 ).

In addition to the components mentioned so far, the cleaning agents according to the invention can contain further ingredients which further improve the performance and / or aesthetic properties of the cleaning agent. These include, for example, additives to improve the drainage and drying behavior, to adjust the viscosity and / or to stabilize, as well as other auxiliaries and additives common in cleaning agents, such as UV stabilizers, perfume, pearlescent agents, dyes, corrosion inhibitors, preservatives, bitter substances, organic Salts, disinfectants, structuring polymers, defoamers, encapsulated ingredients (eg encapsulated perfume), pH adjusters as well as skin feel-improving or nourishing additives.

To further improve the runoff and / or drying behavior, the agent according to the invention can contain one or more additives from the group of polymers and builder substances, usually in an amount of 0.001 to 5% by weight, preferably 0.01 to 4 % By weight, in particular 0.1 to 3% by weight, particularly preferably 0.2 to 2% by weight, extremely preferably 0.5 to 1.5% by weight, for example 1% by weight.

For the purposes of the present invention, polymeric thickeners are the polycarboxylates which thicken as polyelectrolytes, preferably homo- and copolymers of acrylic acid, in particular acrylic acid copolymers, such as acrylic acid-methacrylic acid copolymers, and the polysaccharides, in particular heteropolysaccharides, and other customary thickening polymers.

Suitable polysaccharides or heteropolysaccharides are the polysaccharide gums, for example gum arabic, agar, alginates, carrageenan and their salts, guar, guaran, tragacant, gellan, ramsan, dextran or xanthan and their derivatives, for example propoxylated guar, and their mixtures. Other polysaccharide thickeners, such as starches or cellulose derivatives, can be used alternatively, but preferably in addition to a polysaccharide rubber, For example, starches of various origins and starch derivatives, for example hydroxyethyl starch, starch phosphate esters or starch acetates, or carboxymethyl cellulose or its sodium salt, methyl, ethyl, hydroxyethyl, hydroxypropyl, hydroxypropyl methyl or hydroxyethyl methyl cellulose or cellulose acetate.

Acrylic acid polymers suitable as polymeric thickeners are, for example, high molecular weight homopolymers of acrylic acid (INCI carbomer) crosslinked with a polyalkenyl polyether, in particular an allyl ether of sucrose, pentaerythritol or propylene, which are also referred to as carboxyvinyl polymers.

However, particularly suitable polymeric thickeners are the following acrylic acid copolymers: (i) Copolymers of two or more monomers from the group of acrylic acid, methacrylic acid and their simple esters (INCI acrylates copolymer), preferably formed with C ₁₄ alkanols, to which, for example, the Copolymers of methacrylic acid, butyl acrylate and methyl methacrylate ( CAS 25035-69-2 ) or of butyl acrylate and methyl methacrylate ( CAS 25852-37-3 ) belong; (ii) Crosslinked high molecular acrylic copolymers, for example the copolymers of C _10-30 alkyl acrylates crosslinked with an allyl ether of sucrose or pentaerythritol with one or more monomers from the group consisting of acrylic acid, methacrylic acid and their simple, preferably with C ₁₄ alkanols formed, esters (INCI Acrylates / C10-30 Alkyl Acrylate Crosspolymer) belong.

The polymeric thickener content is usually not more than 8% by weight, preferably between 0.1 and 7% by weight, particularly preferably between 0.5 and 6% by weight, in particular between 1 and 5% by weight and most preferably between 1.5 and 4% by weight, for example between 2 and 2.5% by weight, based on the total weight of the cleaning agent.

To stabilize the agent according to the invention, in particular with a high surfactant content, one or more dicarboxylic acids and / or their salts can be added, in particular a composition of Na salts of adipic, succinic and glutaric acid, as described e.g. is available under the trade name Sokalan® DSC. The use here is advantageously in amounts of 0.1 to 8% by weight, preferably 0.5 to 7% by weight, in particular 1.3 to 6% by weight and particularly preferably 2 to 4% by weight, based on the total weight of the detergent.

However, if they can be dispensed with, the agent according to the invention is preferably free of dicarboxylic acid (salts).

In addition, one or more further additives and additives, in particular in hand dishwashing detergents and cleaning agents for hard surfaces, can be used, in particular UV stabilizers, perfume, pearlescent agents (INCI opacifying agents; for example glycol distearate, for example Cutina® AGS from Cognis, or mixtures containing this, for example the Euperlane® from Cognis), dyes, corrosion inhibitors, preservatives (e.g. the technical 2-bromo-2-nitropropane-1,3-diol, also known as bronopol ( CAS 52-51-7 ), which is commercially available from Boots, for example, as Myacide® BT or as Boots Bronopol BT), organic salts, disinfectants, enzymes, pH adjusters and skin feel-improving or skin-care additives (e.g. dermatologically active substances such as vitamin A, vitamin B2 , Vitamin B12, vitamin C, vitamin E, D-panthenol, sericerin, collagen partial hydrolyzate, various vegetable protein partial hydrolyzates, protein hydrolyzate fatty acid condensates, liposomes, cholesterol, vegetable and animal oils such as lecithin, soybean oil, etc., plant extracts such as aloe vera, azulene, witch hazel extracts, algae extracts, etc., allantoin, AHA complexes, glycerin, urea, quaternized hydroxyethyl cellulose), in amounts of usually not more than 5% by weight, based on the Total weight of the detergent.

To adjust and / or stabilize the pH, the agent according to the invention can contain one or more buffer substances (INCI buffering agents), usually in amounts of 0.001 to 5% by weight, preferably 0.005 to 3% by weight, in particular 0 , 01 to 2% by weight, particularly preferably 0.05 to 1% by weight, extremely preferably 0.1 to 0.5% by weight, for example 0.2% by weight. Preferred buffer substances are complexing agents or even chelating agents (chelators, INCI chelating agents). Particularly preferred buffer substances are citric acid and citrates, in particular sodium and potassium citrates, for example trisodium citrate · 2H ₂ O and tripotassium citrate · H ₂ O.

The agent according to the invention can be used for cleaning hard surfaces, in particular for manual cleaning of dishes.

The cleaning agent is produced using customary and known methods and processes.

Finally, the present invention also relates to a method for cleaning hard surfaces, which is characterized in that an agent described here is used in at least one method step.

Another object of the invention is the use of an agent described herein for cleaning hard surfaces.

Yet another object of the invention is the use of the surfactant combinations described here to improve the washing performance of a dishwashing detergent, preferably hand dishwashing detergent.

Another object of the invention is a dosing bottle for hand dishwashing detergent, which contains the hand dishwashing detergent according to the invention. Bottles which have a diameter of a metering opening and which are smaller by a factor of at least 5, preferably a factor of at least 10, than the overall diameter of the bottle, are preferably referred to as dosing bottles. The metering opening is the opening through which the agent comes out of the bottle. In the present case, the overall diameter is understood to mean the widest extent in at least one spatial direction, the at least one spatial direction being arranged essentially perpendicular to the height axis of the bottle. The metering opening is preferably less than 1 cm, or even less than 0.5 cm.

All matters, objects and embodiments described for the means described herein are also applicable to the above-mentioned methods and uses. Therefore, reference is expressly made here to the disclosure at the appropriate point with the note that this disclosure also applies to the methods and uses described above.

Example compositions were produced: <u> Table 1: </u> C1 E1 Amine oxide 1.9 2.6 Na cumene sulfonate 1.5 1.6 Betaine 2.8 0.0 SLES 7.5 10.4 Amlase / protease <1% <1% Perfume dye <1% <1% water rest rest pH Viscosity C1 [mPa * s] Viscosity E1 [mPa * s] 9 545 142 8.5 785 185 8th 1400 854 7.5 14300 3625 7 1980 1435 6.5 230 240 6 195 205

The components of compositions C1 and E1 are given in Table 1. C1 is a comparative example according to the prior art. In particular, C1 contains smaller amounts of amine oxide compared to the total amount of surfactant, but the amphoteric betaine as an additional surfactant. E1 is a composition according to the invention. E1 does not use betaines. The cleaning performance of E1 was not reduced compared to the cleaning performance of C1.

Table 2 shows the viscosities as a function of the pH value for both C1 and E1. According to the invention, the viscosity of liquids is measured at 20 ° C. using a Brookfield DV-II + Pro Viscometer with spindle 31, at 0.6 rpm.

It can be seen that E1 has low viscosity values over the entire pH range. In contrast, C1 shows an extremely high viscosity, especially in the preferred pH range from 7 to 8. The pH range from 7 to 8 is preferred because the enzymes used can be stabilized particularly effectively in this range. However, the extremely high viscosity values are disadvantageous for hand dishwashing detergents: in the case of C1, dosing with a dosing bottle is made more difficult. Detergent residues are often left behind in the dosing bottle because they cannot be completely removed from the bottle due to the high viscosity of the detergent. Furthermore, the viscous cleaning agent C1 is more slowly soluble in water and is therefore less suitable for use as a hand dishwashing liquid. The surfactant combination E1 for hand dishwashing detergents according to the invention is easier and more cost-effective to produce than the three-component surfactant system C1, because there is no amphoteric surfactant, without reducing the cleaning performance. In summary, the invention is based on the surprising finding that at alkaline pH values, but especially at pH values between 7 and 8, the viscosity by using an amount of amine oxide surfactant is at least 20% by weight with respect to the total amount of surfactant and no betaines has, can be significantly reduced. The inventors have surprisingly discovered that in the case of surfactant combinations with amine oxides, the viscosity has a particularly strong dependence on pH, provided that alkaline pH values are present. It is believed that the absence of betaines contributes to lowering the viscosity.

Claims (13)

Hand dishwashing detergent comprising: at least one anionic surfactant; and at least one amine oxide surfactant, wherein the amount of amine oxide surfactant is at least 20% by weight of the total amount of surfactant, and the composition has a viscosity factor of 0.1 to 50 mPas. Hand dishwashing liquid according to claim 1, wherein the hand dishwashing liquid comprises no betaines. Hand dishwashing liquid according to one of the preceding claims, wherein the amount of amine oxide surfactant is 20 wt .-% to 50 wt .-% of the total amount of surfactant. Hand dishwashing liquid according to one of the preceding claims, wherein the pH is 6 to 10, preferably 6.5 to 8.5 and more preferably pH 7 to 8.5. Hand dishwashing detergent according to one of the preceding claims, wherein the anionic surfactant is an alkoxylated anionic surfactant, preferably with a degree of alkoxylation of 2. Hand dishwashing detergent according to the preceding claim, wherein the anionic surfactant is an ether sulfate, wherein the ether sulfate is preferably lauryl ether sulfate. Hand dishwashing detergent according to one of the preceding claims, wherein the hand dishwashing detergent comprises only the at least one anionic surfactant and the at least one amine oxide as surfactants. Hand dishwashing detergent according to the preceding claim, wherein the hand dishwashing detergent comprises only an ether sulfate and an amine oxide as surfactants. Hand dishwashing liquid according to one of the preceding claims, wherein the hand dishwashing liquid contains a hydrotropic agent. Hand dishwashing detergent according to the preceding claim, wherein the hydrotropic agent comprises sodium cumene sulfonate. Hand dishwashing liquid according to one of the preceding claims, wherein the hand dishwashing liquid has a viscosity factor of 0.2 to 10 mPas, more preferably of 0.2 to 5 mPas. Use of a hand dishwashing liquid according to one of the preceding claims for the manual cleaning of dishes. Dosing bottle for hand dishwashing detergent, which contains a hand dishwashing detergent according to one of the preceding claims.