VISCOSITY REGULATION IN HAND WASHING DETERGENTS

Description

[0001] The present invention relates to a hand dishwashing detergent. Furthermore, the present invention also relates to the use of such a detergent for cleaning dishes.

[0002] There is a high demand for liquid cleaning agents, especially hand dishwashing detergents, as they are easier to use and dose than solid products. Liquid cleaning agents are usually offered in dosing bottles. The viscosity of such products is of paramount importance: If cleaning agents are too viscous, dosing becomes difficult. Often, cleaning agent residues remain in the dosing bottle because they cannot be completely removed from the bottle due to the cleaning agent's high viscosity. Furthermore, highly viscous cleaning agents dissolve more slowly in water and are therefore less suitable for use as hand dishwashing detergents. The viscosity of the products can be reduced by increasing the solvent content. However, this is usually accompanied by a reduction in cleaning performance and more complex and expensive manufacturing processes, as additional solvents must be added.

[0003] US 2007 / 111924 A1 discloses a liquid cleaning agent suitable for hand dishwashing. The agent contains 22.5 wt.% alkyl ether sulfate and 7.5 wt.% amine oxide, as well as 6.5 wt.% nonionic surfactant.

[0004] WO 95 / 03383 A1 discloses a thickened liquid detergent which is suitable, inter alia, as a hand dishwashing detergent.

[0005] DE 10 2016 202822 A1 also describes a liquid cleaning agent that is suitable, among other things, as a hand dishwashing detergent.

[0006] Further hand dishwashing detergents are known from the documents WO 2014 / 113559 A1 and WO 2018 / 017335 A1.

[0007] The object of the present invention was therefore to identify surfactant combinations for hand dishwashing detergents that exhibit good cleaning performance and can be dosed easily and completely. Furthermore, despite these advantageous properties, the cleaning agent should be easy and cost-effective to produce.

[0008] This object underlying the present application is achieved according to the invention by an amine oxide-containing hand dishwashing detergent, comprising at least one anionic surfactant and at least one amine oxide surfactant, wherein the amount of amine oxide surfactant is 10 wt.% to 50 wt.% of the total amount of surfactant, and the composition preferably has a viscosity factor of 0.1 to 50 mPas, wherein the composition has a viscosity factor of 0.1 to 50 mPas, and wherein the viscosity is measured at 20°C with a Brookfield DV-II+ Pro Viscometer with spindle 31, at 0.6 rpm, and wherein The hand dishwashing detergent comprises only an ether sulfate and an amine oxide as surfactants, and the pH is between 6.5 and 8.5. The composition further comprises at least one amylase and / or one protease.

[0009] The inventors surprisingly discovered that in surfactant combinations with amine oxides, viscosity is particularly dependent on pH, provided that slightly acidic to preferably alkaline pH values are present. The viscosity factor (V) is determined using the relationship V = viscosity [mPa*s] / pH / 100. The viscosity factor thus reflects the interaction of pH and viscosity.

[0010] 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.

[0011] In a further aspect, the present invention is further directed to the use of a

[0012] Hand dishwashing detergent for cleaning dishes.

[0013] If, in connection with the invention, the total amount ratio of amine oxide to the total amount of surfactant is mentioned, it should be noted that the amine oxide, as a non-ionic surfactant, must be added to the total amount of surfactant.

[0014] "At least one" as used herein includes, but is not limited to, 1, 2, 3, 4, 5, 6 and more.

[0015] Unless explicitly stated otherwise, all percentages given in connection with the compositions described herein refer to % by weight, in each case based on the mixture in question.

[0016] For the purposes of the present invention, fatty acids or fatty alcohols or their derivatives—unless otherwise stated—represent branched or unbranched carboxylic acids or alcohols or their derivatives, preferably with 6 to 22 carbon atoms. In particular, the oxo alcohols or their derivatives obtainable, for example, by the Roelen oxo synthesis can also be used accordingly.

[0017] Whenever alkaline earth metals are mentioned below as counterions for monovalent anions, this means that the alkaline earth metal is naturally present in only half the amount of the anion - sufficient to balance the charge.

[0018] For the purposes of the invention, a cleaning agent is understood to mean all agents suitable for cleaning solid surfaces, such as dishwashing detergents, especially hand dishwashing detergents. Other suitable ingredients are described in detail below.

[0019] According to a preferred embodiment of the invention, a hand dishwashing detergent is described which does not contain betaines. Due to the omission of an amphoteric surfactant, the hand dishwashing detergents according to the invention are easier and more cost-effective to produce than a multicomponent surfactant system containing betaine, without the omission of an amphoteric surfactant resulting in a reduction in cleaning performance. It is assumed that the omission of betaines advantageously reduces viscosity.

[0020] According to a preferred embodiment, a hand dishwashing detergent is described, wherein the amount of amine oxide surfactant is 20 wt.% to 30 wt.% of the total amount of surfactant. The inventors have surprisingly discovered that in the case of surfactant combinations with amine oxides, the viscosity is particularly dependent on the pH, provided that slightly acidic to alkaline pH values are present. According to a preferred embodiment, a hand dishwashing detergent is described, wherein the pH is 7 to 8.5, and more preferably 7 to 8. A pH of about 7.5 is also preferred. The stated pH ranges 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 containing amine oxides known from the prior art, since the viscosity values increase considerably.

[0021] Preferably, the composition comprises one or more anionic surfactants in a total amount of from 3 wt% to 60 wt%, more preferably from 3 wt% to 40 wt%, and more preferably from 10 wt% to 35 wt%.

[0022] According to the invention, a hand dishwashing detergent is described, wherein the anionic surfactant is an ether sulfate, the ether sulfate is preferably lauryl ether sulfate.

[0023] According to the invention, a hand dishwashing detergent is described, wherein the hand dishwashing detergent comprises only the ether sulfate and the at least one amine oxide as surfactants. Because additional surfactants, such as amphoteric surfactants, are eliminated, the hand dishwashing detergents according to the invention can be produced more easily and cost-effectively than multi-component surfactant systems, without any reduction in cleaning performance.

[0024] According to the invention, a hand dishwashing detergent is described, wherein the hand dishwashing detergent comprises only an ether sulfate and an amine oxide as surfactants. Such ether sulfates are particularly preferred anionic surfactants in combination with amine oxides, especially when amphoteric surfactants are omitted.

[0025] According to a preferred embodiment, a hand dishwashing detergent is described, wherein the hand dishwashing detergent contains a hydrotropic agent, wherein the hydrotropic agent preferably comprises sodium cumenesulfonate.

[0026] According to a preferred embodiment, a hand dishwashing detergent is described, wherein the hand dishwashing detergent has a viscosity factor of 0.2 to 30 mPas. The viscosity factor reflects the interplay of pH and viscosity, which in this case is provided by the composition according to the invention.

[0027] These and other aspects, features, and advantages of the invention will become apparent to those skilled in the art from a study of the following detailed description and claims. It is understood that any feature of one aspect of the invention may be employed in any other aspect of the invention. Furthermore, it is understood 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 limited to these examples. Numerical ranges given in the format "from x to y" include the stated values. Where multiple preferred numerical ranges are given in this format, it is understood that all ranges resulting from the combination of the various endpoints are also encompassed.

[0028] The cleaning agent according to the invention contains at least one amine oxide. In principle, all amine oxides established in the prior art for these purposes, i.e. compounds having 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 in this regard. Particularly preferably used amine oxides 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. Examples of suitable amine oxides are N-cocoalkyl-N,N-dimethylamine oxide and N-tallowalkyl-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 wt.%, preferably at least 30 wt.%, more preferably at least 40 wt.%, most preferably at least 50 wt.%, 60 wt.%, 70 wt.% or 80 wt.% of C 16-18 amine oxides, based on the total weight of the amine oxides. In such embodiments, a further radical 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 shorter-chain ones with regard to cleaning performance, particularly in the surfactant combination described.

[0029] 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).

[0030] 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 radicals R 1< are selected from decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl radicals, and mixtures thereof, with preference given to those with an even number of carbon atoms. Particularly preferred radicals R 1< 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 represents a monovalent cation or the nth part of an n-valent cation, preferred are the alkali metal ions and among them Na +< or K +< , with Na +< being most preferred.Further cations X +< can be selected from NH 4 +< , ½ Zn 2+< ,½ Mg 2+< ,½ Ca 2+< ,½ Mn 2+< , and mixtures thereof.

[0031] AO represents an ethylene oxide (EO) or propylene oxide (PO) group, preferably an ethylene oxide group. The index n represents an integer from 1 to 50, preferably from 1 to 20, and in particular from 2 to 10. Most preferably, n represents the numbers 2, 3, 4, 5, 6, 7, or 8.

[0032] Preferred fatty alcohol ether sulfates are those of the formula I-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).

[0033] In one embodiment, the cleaning agents according to the present invention are liquid and contain water as the main solvent, i.e., they are aqueous cleaning agents. The water content of the aqueous agent according to the invention is typically 15 to 95 wt.%, preferably 20 to 90 wt.%. In various embodiments, the water content is more than 5 wt.%, preferably more than 15 wt.%, and particularly preferably more than 25 wt.%, in each case based on the total amount of cleaning agent.

[0034] Non-aqueous solvents can also be added to the cleaning agent. Suitable non-aqueous solvents include mono- or polyhydric alcohols, alkanolamines, or glycol ethers, provided they are miscible with water within the specified concentration range. The solvents are preferably selected from ethanol, n-propanol, i-propanol, butanols, glycol, propanediol, butanediol, methylpropanediol, glycerin, diglycol, propyl diglycol, butyl diglycol, hexylene glycol, ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol propyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol methyl ether, 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-methoxybutanol, propylene glycol t-butyl ether, di-n-octyl ether and mixtures of these solvents.

[0035] The one or more non-aqueous solvents are usually present in an amount of 0.1 to 10 wt.%, preferably 1 to 8 wt.%, based on the total composition.

[0036] The agents described herein may, in various embodiments, further contain at least one protease. The proteases used are preferably alkaline serine proteases. They act as nonspecific endopeptidases, meaning they hydrolyze any acid amide bonds located within peptides or proteins, thereby causing the degradation of protein-containing soils on the items being cleaned. Their pH optimum is usually in the significantly alkaline range.

[0037] The proteases preferably used according to the invention are preferably serine proteases, in particular subtilases, particularly preferably subtilisins. The subtilisin can be a wild-type enzyme or a subtilisin variant, with 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 that is at least 70% identical thereto, the alkaline protease from Bacillus sp. (DSM 14390) or an alkaline protease that is at least 98.5% identical thereto, and the alkaline protease from Bacillus sp. (DSM 14392) or an alkaline protease that is at least 98.1% identical to it.

[0038] Examples of proteases that can be used in the compositions described herein are subtilisin 309 or functional fragments / variants thereof and variants of the alkaline protease from Bacillus lentus or variants thereof. Subtilisin 309 is marketed under the trade name Savinase ® by Novozymes A / S, Bagsvaerd, Denmark. Of the subtilisin 309 from Bacillus lentusOptimized enzyme variants are available from Novozymes under the trade names Blaze® and Ovozyme®, which represent a preferred embodiment of the invention. The protease variants known as BLAP®, for example, are derived from the alkaline protease from Bacillus lentus DSM 5483. Preferred protease variants in particular are those which, compared to the BLAP wt (wild-type) enzyme, in the BLAP wt count, have at least one mutation at R99, in particular R99E or R99D, with particular preference being given to R99E, and optionally additionally at least one or two, preferably all three, of the amino acid substitutions S3T, V4I and V199I. Particular preference is given to the BLAP variants as described in SeqID No. 4 or 5 of WO2014 / 177430.

[0039] In the cleaning agents described herein, the enzymes to be used can also be formulated together with accompanying substances, such as those from fermentation. In liquid formulations, the enzymes are preferably used as liquid enzyme formulation(s).

[0040] Proteases are generally not provided in the form of pure proteins, but rather in the form of stabilized, storable, and transportable preparations. These prefabricated preparations include, for example, solid preparations obtained by granulation, extrusion, or lyophilization or, particularly in the case of liquid or gel-like products, solutions of the enzymes, preferably as concentrated as possible, with little water content, and / or containing stabilizers or other additives.

[0041] Alternatively, the enzymes can be encapsulated for both solid and liquid dosage forms, 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 if in a solidified gel, or in those of the core-shell type, in which an enzyme-containing core is coated with a water-, air-, and / or chemical-impermeable protective layer. Additional active ingredients, such as stabilizers, emulsifiers, pigments, bleaching agents, or dyes, can be applied in superimposed layers. Such capsules are applied using methods known per se, for example by shake or roll granulation or in fluid-bed processes. Such granules, for example by applying polymeric film formers, are advantageously low in dust and, due to the coating, are stable during storage.

[0042] Furthermore, it is possible to package two or more enzymes together so that a single granulate has multiple enzyme activities.

[0043] In addition to the at least one protease, cleaning agents according to the invention may contain one or more further enzymes, in particular from the following group: amylases, hemicellulases, cellulases, lipases and oxidoreductases.

[0044] The amylase(s) is / are 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 single-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. All of the enzymes mentioned can be formulated as described above for the proteases.

[0045] In cleaning agents according to the invention, which in one embodiment are in predominantly liquid, pasty or gel form, the at least one enzyme, preferably the at least one protease, is contained in an amount of 0.01 - 1.6 wt.%, preferably 0.08 - 1.2 wt.%, based on the total weight of the cleaning agent.

[0046] In various embodiments, the enzyme(s) can be preformulated with enzyme stabilizers in an enzyme composition. The enzyme protein typically constitutes only a fraction of the total weight of the enzyme preparation. Preferably used enzyme preparations contain between 0.1 and 40 wt.%, preferably between 0.2 and 30 wt.%, particularly preferably between 0.4 and 20 wt.%, and in particular between 0.8 and 10 wt.% of the enzyme protein. In such compositions, an enzyme stabilizer can be present in the enzyme composition in an amount of 0.05-35 wt.%, preferably 0.05-10 wt.%, based on the total weight. This enzyme composition can then be used in cleaning agents according to the invention, specifically in amounts that lead to the final concentrations in the cleaning agent specified above. Suitable enzyme stabilizers are known in the art.In various embodiments, the agent according to the invention may accordingly additionally comprise one or more enzyme stabilizers.

[0047] The protein concentration can be determined using known methods, for example, the BCA method (bicinchoninic acid; 2,2'-biquinolyl-4,4'-dicarboxylic acid) or the biuret method. The active protein concentration is determined by titrating the active sites 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).

[0048] In addition to the components mentioned above, the cleaning agents according to the invention can contain other ingredients that further improve the application and / or aesthetic properties of the cleaning agent. These include, for example, additives to improve drainage and drying behavior, to adjust viscosity, and / or for stabilization, as well as other auxiliaries and additives commonly found in cleaning agents, such as UV stabilizers, perfume, pearlescent agents, dyes, corrosion inhibitors, preservatives, bittering agents, organic salts, disinfectants, structuring polymers, defoamers, encapsulated ingredients (e.g., encapsulated perfume), pH adjusters, and skin-feel-improving or conditioning additives.

[0049] To further improve the flow and / or drying behavior, the agent according to the invention can contain one or more additives from the group of polymers and builder substances (builders), usually in an amount of 0.001 to 5 wt.%, preferably 0.01 to 4 wt.%, in particular 0.1 to 3 wt.%, particularly preferably 0.2 to 2 wt.%, extremely preferably 0.5 to 1.5 wt.%, for example 1 wt.%.

[0050] Polymeric thickeners within the meaning of the present invention are the polycarboxylates which act as polyelectrolytes to thicken, 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, as well as other customary thickening polymers.

[0051] Suitable polysaccharides or heteropolysaccharides are polysaccharide gums, for example gum arabic, agar, alginates, carrageenans and their salts, guar, guaran, tragacanth, gellan gum, ramsan gum, dextran or xanthan gum and their derivatives, e.g., propoxylated guar gum, as well as their mixtures. Other polysaccharide thickeners, such as starches or cellulose derivatives, can be used alternatively, but preferably in addition, to a polysaccharide gum. These include starches of various origins and starch derivatives, e.g., hydroxyethyl starch, starch phosphate esters or starch acetates, or carboxymethylcellulose or its sodium salt, methyl, ethyl, hydroxyethyl, hydroxypropyl, hydroxypropylmethyl or hydroxyethylmethylcellulose, or cellulose acetate.

[0052] 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.

[0053] 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, preferably formed with C 1-4 alkanols (INCI Acrylates Copolymer), which include, 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); (ii) cross-linked high molecular weight acrylic acid copolymers, which include, for example, copolymers of C 10-30 alkyl acrylates cross-linked with an allyl ether of sucrose or pentaerythritol with one or more monomers from the group of acrylic acid, methacrylic acid and their simple esters, preferably formed with C 1-4 alkanols (INCI Acrylates / C10-30 Alkyl Acrylate Crosspolymer).

[0054] The content of polymeric thickener is usually not more than 8 wt.%, preferably between 0.1 and 7 wt.%, particularly preferably between 0.5 and 6 wt.%, in particular between 1 and 5 wt.% and most preferably between 1.5 and 4 wt.%, for example between 2 and 2.5 wt.%, based on the total weight of the cleaning agent.

[0055] To stabilize the agent according to the invention, particularly with a high surfactant content, one or more dicarboxylic acids and / or their salts can be added, in particular a composition of sodium salts of adipic, succinic, and glutaric acid, such as is available under the trade name Sokalan®< DSC. They are advantageously used in amounts of 0.1 to 8 wt.%, preferably 0.5 to 7 wt.%, in particular 1.3 to 6 wt.%, and particularly preferably 2 to 4 wt.%, based on the total weight of the cleaning agent.

[0056] However, if their use can be dispensed with, the agent according to the invention is preferably free of dicarboxylic acid (salts).

[0057] In addition, one or more other auxiliary substances and additives which are common in hand dishwashing detergents and cleaning agents for hard surfaces, in particular UV stabilizers, perfume, pearlescent agents (INCI opacifying agents; for example glycol distearate, e.g. Cutina ®< AGS from Cognis, or mixtures containing this, e.g. Euperlane ®< from Cognis), dyes, corrosion inhibitors, preservatives (e.g. 2-bromo-2-nitropropane-1,3-diol (CAS 52-51-7), also known technically as Bronopol, which is commercially available, for example, as Myacide ®< BT or as Boots Bronopol BT from Boots), 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 hydrolysate, various vegetable protein partial hydrolysates, protein hydrolysate 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 hydroxyethylcellulose), in amounts of usually not more than 5% by weight, based on the total weight of the cleaning agent.

[0058] 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 wt.%, preferably 0.005 to 3 wt.%, in particular 0.01 to 2 wt.%, particularly preferably 0.05 to 1 wt.%, extremely preferably 0.1 to 0.5 wt.%, for example 0.2 wt.%. Preference is given to buffer substances that are simultaneously complexing agents or even chelating agents (chelators, INCI chelating agents). Particularly preferred buffer substances are citric acid or citrates, in particular sodium and potassium citrates, for example trisodium citrate·2H2O and tripotassium citrate·H2O.

[0059] The agent according to the invention can be used for cleaning hard surfaces, in particular for manual cleaning of dishes.

[0060] The cleaning agent is manufactured using conventional and known methods and processes.

[0061] Also disclosed is a method for cleaning hard surfaces, which is characterized in that an agent described herein is used in at least one method step.

[0062] Another subject of the invention is the use of an agent described herein for manually cleaning dishes.

[0063] Furthermore, the use of the surfactant combinations described herein for improving the rinsing performance of a dishwashing detergent, preferably a hand dishwashing detergent, is disclosed.

[0064] A further subject matter of the invention is a dosing bottle for hand dishwashing detergent, which contains the hand dishwashing detergent according to the invention. Dosing bottles are preferably bottles that have a dosing opening diameter that is at least 5 times smaller, preferably at least 10 times smaller, than the overall diameter of the bottle. The dosing opening is the opening through which the detergent exits the bottle. The overall diameter is understood here to be the widest dimension in at least one spatial direction, wherein the at least one spatial direction is arranged substantially perpendicular to the vertical axis of the bottle. The dosing opening is preferably smaller than 1 cm, or even smaller than 0.5 cm.

[0065] All facts, objects, and embodiments described for the means described herein are also applicable to the methods and uses mentioned above. Therefore, express reference is made here to the disclosure at the appropriate point, with the note that this disclosure also applies to the methods and uses described above.

[0066] Example compositions were prepared: Table 1: C1 E1 Amine oxide 1,9 2,6 Na-cumenesulfonate 1,5 1,6 Betaine 2,8 0,0 SLES 7,5 10,4 Amylase / Protease <1% <1% Fragrance Dye < 1% < 1% Water rest rest Table 2: pH Viscosity C1 [mPa*s] Viscosity E1 [mPa*s] 9 545 142 8,5 785 185 8 1400 854 7,5 14300 3625 7 1980 1435 6,5 230 240 6 195 205

[0067] The components of compositions C1 and E1 are listed in Table 1. C1 is a comparative example according to the prior art. In particular, C1 contains lower amounts of amine oxide compared to the total amount of surfactant, but contains amphoteric betaine as an additional surfactant. E1 is a composition according to the invention. Betaines are not used in E1. The cleaning performance of E1 was not reduced compared to that of C1.

[0068] Table 2 shows the viscosities as a function of pH for both C1 and E1. The viscosity of liquids is measured according to the invention at 20°C using a Brookfield DV-II+ Pro viscometer with spindle 31 at 0.6 rpm.

[0069] It can be seen that E1 has low viscosity values across the entire pH range. In contrast, C1 displays an extremely high viscosity, particularly in the preferred pH range of 7 to 8. The pH range of 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 using a dosing bottle is difficult. Detergent residues often remain in the dosing bottle because they cannot be completely removed from the bottle due to the detergent's high viscosity. Furthermore, the viscous detergent C1 dissolves more slowly in water and is therefore less suitable for use as a hand dishwashing detergent.The surfactant combination E1 according to the invention for hand dishwashing detergents can be produced more easily and cost-effectively than the three-component surfactant system C1 because it omits an amphoteric surfactant, without any reduction in cleaning performance. In summary, the invention is based on the surprising discovery that at alkaline pH values, but particularly at pH values between 7 and 8, the viscosity can be significantly reduced by using an amount of amine oxide surfactant based on the total amount of surfactant of at least 20 wt.% and containing no betaines. The inventors have surprisingly discovered that in the case of surfactant combinations with amine oxides, the viscosity is particularly dependent on pH, provided alkaline pH values are present. It is assumed that the omission of betaines contributes to the reduction in viscosity.

Claims

1. A hand dishwashing detergent comprising: at least one amylase and / or one protease at least one anionic surfactant; and at least one amine oxide surfactant, wherein the amount of amine oxide surfactant is at least 20 wt.% of the total amount of surfactant, characterized in that the composition has a viscosity factor of 0.1 to 50 mPas; and wherein the viscosity is measured at 20°C using a Brookfield DV-II+ Pro Viscometer with spindle 31, at 0.6 rpm; the hand dishwashing detergent contains only ether sulfate and amine oxide as surfactants; and the pH value is 6.5 to 8.5.

2. The hand dishwashing detergent 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.

3. The hand dishwashing detergent according to one of the preceding claims, wherein the pH value is 7 to 8.5.

4. The hand dishwashing detergent according to one of the preceding claims, wherein the anionic surfactant has a degree of alkoxylation of 2.

5. The hand dishwashing detergent according to the preceding claim, wherein the anionic surfactant is lauryl ether sulfate.

6. The hand dishwashing detergent according to one of the preceding claims, wherein the hand dishwashing detergent contains a hydrotropic agent.

7. The hand dishwashing detergent according to the preceding claim, wherein the hydrotropic agent comprises sodium cumenesulfonate.

8. The hand dishwashing detergent according to one of the preceding claims, wherein the hand dishwashing detergent has a viscosity factor of 0.2 to 10 mPas, more preferably of 0.2 to 5 mPas.

9. The use of a hand dishwashing detergent according to one of the preceding claims for manually cleaning dishes.

10. A dosing bottle for hand dishwashing detergent, which dosing bottle contains a hand dishwashing detergent according to one of the preceding claims.