Liquid detergent composition for kitchen use

Abstract

To provide a liquid detergent composition for kitchen use that contains an amphoteric surfactant, the liquid detergent composition for kitchen use exhibiting superior foam persistence and cleaning power persistence, and further exhibiting superior storage stability when diluted.SOLUTION: The invention relates to a liquid detergent composition for kitchen use containing (A) an amphoteric surfactant, (B) a fatty acid N-methylalkanolamide, and (C) a polyoxyalkylene alkyl ether, the polyoxyalkylene alkyl ether (C) having a linear or branched alkyl group having 1 to 10 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid dishwashing detergent composition. [Background technology]

[0002] Dishwashing methods for hand-washing kitchen utensils such as tableware and cooking implements include scrubbing the dishes with a cleaning tool such as a sponge to which a liquid kitchen detergent has been applied, followed by rinsing with water, and dispersing the liquid kitchen detergent in water to form a soaking solution, immersing the dishes in this soaking solution, and leaving them for a certain period of time before rinsing with water. Liquid detergents used for hand-washing dishes contain a surfactant (typically an amphoteric surfactant) as a cleaning component, and the surfactant functions to remove oily stains from the dishes. Patent Document 1, for example, discloses a detergent composition containing an amphoteric surfactant and a diol synthase as an example of a liquid kitchen detergent containing an amphoteric surfactant as its main component.

[0003] In recent years, with the growing interest in the SDGs, there has been a demand for environmentally friendly liquid dishwashing detergents that can clean larger amounts of dishes with smaller amounts. In other words, in the development of liquid dishwashing detergents, there is a greater demand than ever before for improvements in foaming and the durability of cleaning performance. In addition, for ease of handling, liquid dishwashing detergents are sometimes prepared in advance by diluting them several times (e.g., to achieve a concentration closer to that used in actual cleaning), and traditionally, storage stability after dilution has also been a key requirement for liquid dishwashing detergents. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2021-502444 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above circumstances, and aims to provide a liquid kitchen detergent composition containing an amphoteric surfactant, which has excellent foaming durability and detergency durability, and also has excellent storage stability when diluted. [Means for solving the problem]

[0006] As a result of intensive research aimed at solving the above problems, the present inventors have unexpectedly found that by combining an amphoteric surfactant with a fatty acid N-methylalkanolamide and a specific polyoxyalkylene alkyl ether, it is possible to improve the foaming durability and detergency durability, and furthermore, the diluted product does not develop cloudiness or separation when stored, resulting in excellent storage stability when diluted, and have thus completed the present invention. That is, the gist of the present invention is as follows.

[0007] [1] A liquid dishwashing detergent composition comprising (A) an amphoteric surfactant, (B) a fatty acid N-methylalkanolamide, and (C) a polyoxyalkylene alkyl ether, wherein the polyoxyalkylene alkyl ether is a polyoxyalkylene alkyl ether having a linear or branched alkyl group having 1 to 10 carbon atoms. [2] The liquid dishwashing detergent composition according to [1], which does not contain an anionic surfactant. [3] The liquid dishwashing detergent composition according to [1] or [2], wherein (C) the polyoxyalkylene alkyl ether is a polyoxyalkylene alkyl ether having a linear or branched alkyl group having 8 or 10 carbon atoms. [4] The liquid dishwashing detergent composition according to any one of [1] to [3], which has a pH in the range of 6.0 to 8.0. [5] A method for cleaning kitchen utensils, comprising cleaning the object to be cleaned using the liquid kitchen detergent composition described in [1].

[0008] It should be noted that any two or more of the above configurations [1] to [5] can be selected and combined. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a liquid dishwashing detergent composition that has excellent foaming durability and detergency durability, and also has excellent storage stability when diluted. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail below. The terms used in this specification are to be interpreted in the sense commonly used in the art unless otherwise specified.

[0011] <Liquid dishwashing detergent composition> The liquid dishwashing detergent composition of the present invention (hereinafter sometimes simply referred to as the detergent composition) contains (A) an amphoteric surfactant, (B) a fatty acid N-methylalkanolamide, and (C) a polyoxyalkylene alkyl ether, wherein the polyoxyalkylene alkyl ether (C) is a polyoxyalkylene alkyl ether having a linear or branched alkyl group having 1 to 10 carbon atoms. The liquid dishwashing detergent composition of the present invention contains an amphoteric surfactant as the main surfactant, but also contains a fatty acid N-methylalkanolamide and a specific polyoxyalkylene alkyl ether in combination, thereby realizing high detergent foaming durability and detergency durability, as well as high storage stability when diluted.

[0012] [(A) Amphoteric surfactant] In the present invention, the amphoteric surfactant (A) can be any amphoteric surfactant known in the art, and can be widely used without any particular limitations. Specific examples of amphoteric surfactants include betaine-type, amine oxide-type, and amino acid-type amphoteric surfactants. Among these, betaine-type and amine oxide-type amphoteric surfactants are preferably used.

[0013] Examples of betaine-type amphoteric surfactants include carboxylate-type surfactants such as lauryl dimethylaminoacetic acid betaine (lauryl betaine), myristyl dimethylaminoacetic acid betaine, coconut alkyl dimethylaminoacetic acid betaine, coconut oil fatty acid amidopropyl betaine, lauric acid amidopropyl dimethylaminoacetic acid betaine, myristate amidopropyl dimethylaminoacetic acid betaine, coconut alkyl amidopropyl dimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl imidazolinium betaine, and 2-alkyl-N-carboxyethyl imidazolinium betaine; and sulfonate-type surfactants such as lauryl dimethyl sulfobetaine (lauryl sultaine) and lauryl hydroxysulfobetaine (lauryl hydroxysultaine).

[0014] Examples of amine oxide amphoteric surfactants include alkylamine oxide surfactants such as octyldimethylamine oxide, decyldimethylamine oxide, lauryldimethylamine oxide (n-dodecyldimethylamine oxide), myristyldimethylamine oxide, palmityldimethylamine oxide, stearyldimethylamine oxide, coconut alkyldimethylamine oxide, lauryl diethylamine oxide, and lauryl dihydroxyethylamine oxide; amidoamine oxide surfactants such as lauric acid amidopropyldimethylamine oxide; and alkyloxypropylamine oxide surfactants such as lauryloxypropylamine oxide.

[0015] Examples of amino acid type amphoteric surfactants include alkyldiaminoethylglycine hydrochloride, alkylpolyaminoethylglycine, alkylaminoethylglycine, alkyldi(aminoethyl)glycine, glycine n-(3-aminopropyl) C10-16 derivative, alkylpolyaminoethylglycine, and alkyl-β-alanine.

[0016] In addition, as the amphoteric surfactant of the present invention, for example, the following commercially available products can be used: GENAMINOX KC (coconut alkyl dimethylamine oxide), GENAMINOX OC (octyl dimethylamine oxide), GENAMINOX K-10 (decyl dimethylamine oxide), GENAMINOX K-12 (lauryl dimethylamine oxide), GENAMINOX MY (myristyl dimethylamine oxide) and the like from Global Amins; UNISAFE A-LE (lauryl dihydroxyethylamine oxide) and the like from NOF Corporation; AMPHOLEX LSB (lauryl hydroxysultaine) and the like from Miyoshi Oil & Fats Co., Ltd.; RECABION A-100 (lauryl betaine) and RECABION A-200 (myristyl betaine) and the like from New Japan Chemical Co., Ltd.; SOFTAZOLIN LAO-C (lauric acid amidopropyl dimethylamine oxide) and the like from Kawaken Fine Chemical Co., Ltd.; and TOMAMIN AO from EVONIK Co., Ltd. 728 (linear alkyloxypropylamine oxide), etc.; Sanyo Chemical Industries' Levon T-2 (alkyldiaminoethylglycine hydrochloride), etc.

[0017] In the liquid dishwashing detergent composition of the present invention, the amphoteric surfactant may be used alone or in combination of two or more types.

[0018] The content of (A) amphoteric surfactant in the liquid dishwashing detergent composition of the present invention is not particularly limited, and can be blended in an appropriate amount as long as the effects of the present invention are achieved. From the viewpoint of detergency, the lower limit of the content of (A) amphoteric surfactant is preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 10% by mass or more. From the viewpoint of storage stability, the upper limit of the content of (A) amphoteric surfactant is preferably 30% by mass or less, more preferably 25% by mass or less, and even more preferably 20% by mass or less. The numerical range of the content of (A) amphoteric surfactant is preferably 1% by mass or more and 30% by mass or less, more preferably 5% by mass or more and 25% by mass or less, and even more preferably 10% by mass or more and 20% by mass or less.

[0019] [(B) Fatty acid N-methylalkanolamide] In the present invention, (B) fatty acid N-methylalkanolamides known in the art can be widely used without any particular limitations. Such fatty acid N-methylalkanolamides can be represented, for example, by the following general formula, and those commonly used in the art can be appropriately selected and used. [ka] [In the formula, R 1 -CO- is a saturated or unsaturated acyl group which may have a hydroxyl group, and R 2 is a linear or branched alkylene group, or a linear or branched alkenylene group.

[0020] Here, in the above general formula, R 1 -CO- represents a saturated or unsaturated acyl group which may have a hydroxyl group, and is particularly preferably a saturated or unsaturated acyl group having 6 to 24 carbon atoms which may have a hydroxyl group, and more preferably a saturated or unsaturated acyl group having 8 to 18 carbon atoms.

[0021] R 1 Specific examples of -CO- include acyl groups derived from octanoic acid, decanoic acid, dodecanoic acid, lauric acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, docosanoic acid, linoleic acid, isostearic acid, oleic acid, coconut oil fatty acid, palm oil fatty acid, palm kernel oil fatty acid, etc. Preferred are acyl groups derived from coconut oil fatty acid, lauric acid, etc.

[0022] In the above general formula, R 2 represents a linear or branched alkylene group or a linear or branched alkenylene group, and is particularly preferably a linear or branched alkylene group having 1 to 6 carbon atoms or a linear or branched alkenylene group having 2 to 6 carbon atoms, and more preferably an ethylene group.

[0023] Specifically, examples of fatty acid N-methylalkanolamides in the present invention include coconut oil fatty acid N-methylethanolamide.

[0024] Furthermore, as the fatty acid N-methylalkanolamide in the present invention, for example, the following commercially available products can be used: Aminone C11-S (coconut oil fatty acid N-methylethanolamide) from Kao Corporation, PALMOCOL PMMA1300 (coconut oil fatty acid N-methylethanolamide) from KLK OLEO, etc.

[0025] In the liquid dish detergent composition of the present invention, the fatty acid N-methylalkanolamide may be used alone or in combination of two or more.

[0026] The content of (B) fatty acid N-methylalkanolamide in the liquid dishwashing detergent composition of the present invention is not particularly limited, and can be blended in an appropriate amount as long as the effects of the present invention are achieved. From the viewpoint of foaming durability, the lower limit of the content of (B) fatty acid N-methylalkanolamide is preferably 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more. From the viewpoint of storage stability when diluted, the upper limit of the content of (B) fatty acid N-methylalkanolamide is preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less. The numerical range of the content of (B) fatty acid N-methylalkanolamide is preferably 1% by mass or more and 25% by mass or less, more preferably 3% by mass or more and 20% by mass or less, and even more preferably 5% by mass or more and 15% by mass or less.

[0027] [(C) Polyoxyalkylene alkyl ether] In the present invention, the polyoxyalkylene alkyl ether (C) may be any polyoxyalkylene alkyl ether having a linear or branched alkyl group having 1 to 10 carbon atoms, and any polyoxyalkylene alkyl ether known in the art can be widely used without particular limitation. Such polyoxyalkylene alkyl ethers can be represented, for example, by the following general formula, and any polyoxyalkylene alkyl ether commonly used in the art can be appropriately selected and used. [ka] [In the formula, R 1 is a linear or branched alkyl group having 1 to 10 carbon atoms, and A 1 O represents an oxyalkylene group having 2 to 4 carbon atoms, and n represents the average number of moles of oxyalkylene groups added, which is 1 or more. Preferably, n is 1000 or less. When n is 2 or more, [A 1 O] n In each A 1 The O may be the same oxyalkylene group or different oxyalkylene groups.]

[0028] Here, [A 1 O] n In the case where different oxyalkylene groups are present, the addition of the two or more types of oxyalkylene groups may be in block form or may be random form.

[0029] As described above, the polyoxyalkylene alkyl ether in the present invention has a linear or branched alkyl group having 1 to 10 carbon atoms (i.e., R 1 is a linear or branched alkyl group having 1 to 10 carbon atoms), for example, a linear or branched alkyl group having 8 to 10 carbon atoms is preferred, and a linear or branched alkyl group having 8 or 10 carbon atoms is more preferably used. In addition, either a linear or branched alkyl group can be used, but a linear alkyl group is preferably used.

[0030] Specific examples of the polyoxyalkylene alkyl ether in the present invention include polyoxyethylene octyl ether, polyoxyethylene decyl ether, polyoxyethylene polyoxypropylene octyl ether, polyoxyethylene polyoxypropylene decyl ether, polyoxyalkylene branched decyl ether, polyoxyethylene isodecyl ether, and polyoxyethylene ethylhexyl ether.

[0031] Furthermore, as the polyoxyalkylene alkyl ether in the present invention, for example, the following commercially available products can be used: Finesurf D-1307 (polyoxyethylene decyl ether) and Wondersurf NDR-1400 (polyoxyethylene polyoxypropylene decyl ether) from Aoki Oil & Fat Co., Ltd.; Noigen XL-400D (polyoxyalkylene branched decyl ether) and Noigen SD-80 (polyoxyethylene isodecyl ether) from Daiichi Kogyo Seiyaku Co., Ltd.; Takesurf D-1006EH (polyoxyethylene ethylhexyl ether) and Takesurf D-1007 (polyoxyethylene octyl ether) from Takemoto Oil & Fat Co., Ltd.

[0032] In the liquid dishwashing detergent composition of the present invention, the polyoxyalkylene alkyl ether may be used alone or in combination of two or more kinds.

[0033] The content of (C) polyoxyalkylene alkyl ether in the liquid dishwashing detergent composition of the present invention is not particularly limited, and can be blended in an appropriate amount as long as the effects of the present invention are achieved. From the viewpoint of storage stability when diluted, the lower limit of the content of (C) polyoxyalkylene alkyl ether is preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more. From the viewpoint of blend stability, the upper limit of the content of (C) polyoxyalkylene alkyl ether is preferably 25% by mass or less, more preferably 20% by mass or less, and even more preferably 15% by mass or less. The numerical range of the content of (C) polyoxyalkylene alkyl ether is preferably 1% by mass or more and 25% by mass or less, more preferably 2% by mass or more and 20% by mass or less, and even more preferably 3% by mass or more and 15% by mass or less.

[0034] The mass ratio [(B) / (C)] of the (B) fatty acid N-methylalkanolamide to the (C) polyoxyalkylene alkyl ether in the liquid dish detergent composition of the present invention is not particularly limited and can be appropriately adjusted depending on the types of fatty acid N-methylalkanolamide and polyoxyalkylene alkyl ether to be blended. From the viewpoint of storage stability when diluted, the mass ratio is preferably, for example, 0.1 to 10, more preferably 0.5 to 8, even more preferably 1 to 6, and particularly preferably 1 to 4.

[0035] The mass ratio of (A) amphoteric surfactant, (B) fatty acid N-methylalkanolamide, and (C) polyoxyalkylene alkyl ether [(A):(B):(C)] in the liquid dish detergent composition of the present invention is not particularly limited and can be appropriately adjusted depending on the types of amphoteric surfactant, fatty acid N-methylalkanolamide, and polyoxyalkylene alkyl ether to be blended. From the viewpoint of storage stability after dilution, the mass ratio is preferably 1:0.01-100:0.01-100, more preferably 1:0.1-10:0.1-10, and even more preferably 1:0.2-2:0.2-2.

[0036] In addition to the above-mentioned components, the liquid dish detergent composition of the present invention may contain, as necessary, polymer dispersants, chelating agents, enzymes, colorants, bactericides, water-soluble solvents, antifoaming agents, bleaching agents, bleach activators, antioxidants, disinfectants, fragrances, metal corrosion inhibitors, preservatives, pH adjusters, etc., as long as the effects of the present invention are achieved. The detergent composition of the present invention may also contain any surfactant other than the amphoteric surfactant (e.g., cationic surfactants, nonionic surfactants).

[0037] Here, in the liquid kitchen detergent composition of the present invention, an anionic surfactant may reduce blend stability, so it is preferable that the liquid kitchen detergent composition of the present invention does not contain an anionic surfactant.

[0038] In the liquid dishwashing detergent composition of the present invention, the solvent is water. The water contained in the liquid detergent composition of the present invention is not particularly limited, and examples thereof include tap water, ion-exchanged water, purified water, distilled water, pure water, soft water, and hard water.

[0039] The liquid dishwashing detergent composition of the present invention can be produced by mixing the above-mentioned components in a conventional manner.

[0040] [pH] The pH of the liquid dishwashing detergent composition of the present invention is not particularly limited, but is, for example, 6.0 to 8.0, preferably 6.0 to 7.5, and more preferably 6.0 to 7.0 at 25° C. A pH in this range is preferred from the viewpoint of storage stability.

[0041] <How to clean kitchen utensils> The method for cleaning kitchen utensils using the liquid kitchen detergent composition of the present invention (hereinafter, sometimes simply referred to as the cleaning method) is characterized by cleaning an object to be cleaned using the liquid kitchen detergent composition of the present invention, and other steps, conditions, etc. are not limited. The above description of the liquid kitchen detergent composition of the present invention can be used to explain this cleaning method.

[0042] The cleaning method of the present invention includes, for example, diluting the liquid kitchen detergent composition of the present invention with water to a predetermined ratio to prepare a diluted detergent, and using the diluted liquid detergent to clean an object to be cleaned.

[0043] In the cleaning method of the present invention, the specific cleaning method is not particularly limited, but can be, for example, hand washing. More specifically, scrubbing, soaking, etc. can be performed depending on the item to be cleaned.

[0044] In the cleaning method of the present invention, the liquid dishwashing detergent composition of the present invention may be diluted with water or used as is without dilution. The dilution ratio when diluting the liquid dishwashing detergent composition of the present invention with water is not particularly limited, but is, for example, 2 to 10,000 times. The concentration of the liquid dishwashing detergent composition of the present invention in the diluted detergent is, for example, 0.01% by mass or more and 50% by mass or less.

[0045] The objects to be cleaned with the liquid kitchen detergent composition of the present invention (objects to be cleaned) include kitchen utensils such as tableware such as plates, chopsticks, and spoons; cooking utensils such as pots, knives, and cutting boards; and kitchen equipment such as microwaves and stoves. Among these, the liquid kitchen detergent composition of the present invention is preferably used for cleaning tableware or cooking utensils, and is preferably used for cleaning tableware. Therefore, the liquid kitchen detergent composition of the present invention can also be referred to as, for example, a liquid dish detergent composition or a liquid cookware detergent composition. [Example]

[0046] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0047] Liquid dishwashing detergent compositions were prepared according to the compositions shown in Tables 1 and 2 below, and the following tests were carried out. The components used in the formulations are listed below. The pH of each detergent composition was adjusted to a range of 6.0 to 7.0 (25°C) by adding an appropriate amount of citric acid as a pH adjuster. In the following, "%" represents % by mass unless otherwise specified. Furthermore, the values ​​in parentheses in Tables 1 and 2 are values ​​converted into pure contents.

[0048] [Ingredients] <Fatty acid N-methylalkanolamide> 100% coconut oil fatty acid N-methylethanolamide: Product name "Aminone C11-S", manufactured by Kao Corporation <Amphoteric surfactant> 30% Coco-Alkyl Dimethyl Amine Oxide: Trade Name "GENAMINOX KC", manufactured by Global Amines 30% Lauryl Dimethyl Amine Oxide: Trade Name "GENAMINOX K-12", manufactured by Global Amines 30% Lauryl Hydroxysultaine: Trade name "Amphorex LSB", manufactured by Miyoshi Oil & Fats Co., Ltd. 30% lauryl betaine: Product name "Recabion A-100", manufactured by New Japan Chemical Co., Ltd. <Polyoxyalkylene alkyl ether> Polyoxyethylene decyl ether: Product name "Finesurf D-1307", manufactured by Aoki Oil & Fat Industries Co., Ltd. Polyoxyethylene polyoxypropylene decyl ether: Product name "Wondersurf NDR-1400", manufactured by Aoki Oil & Fat Industries Co., Ltd. Polyoxyalkylene branched decyl ether: Product name "Noigen XL-400D", manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Polyoxyethylene isodecyl ether: Product name "Noigen SD-80", manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Polyoxyethylene ethylhexyl ether: Trade name "Takesurf D-1006EH", manufactured by Takemoto Oil Co., Ltd. Polyoxyethylene octyl ether: Trade name "Takesurf D-1007", manufactured by Takemoto Oil & Fat Co., Ltd. Polyoxyethylene lauryl ether: Trade name "Emulmin NL-80", manufactured by Sanyo Chemical Industries, Ltd. Polyoxyethylene polyoxypropylene lauryl ether: Product name "Noigen LP-180", manufactured by Daiichi Kogyo Seiyaku Co., Ltd. <Anionic surfactants> 30% sodium polyoxyethylene lauryl ether sulfate: Shinorin SPE-1300, manufactured by New Japan Chemical Co., Ltd. 33% sodium lauryl sulfate: trade name "Teikalite N4133", manufactured by Teika Co., Ltd. 40% Sodium α-olefin sulfonate: Trade name "Lipolan LJ-441", manufactured by Lion Specialty Chemicals 93% Sodium Alkanesulfonate: Product name "WeylClean SAS93", manufactured by Azelis Japan 75% sodium diisooctyl sulfosuccinate: Trade name "Marpomase PT", manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.

[0049] [Compound stability test] Each detergent composition was prepared as described above, and then the liquid temperature was adjusted to 25°C. The appearance was visually observed to evaluate the blend stability. The evaluation criteria were as follows: ○: Transparent. △: Gelled. ×: Cloudiness, separation, etc. occurs.

[0050] [Storage stability test when diluted] Each detergent composition was diluted 5 times with water and then stored at 40°C for 1 day. After storage, the appearance was visually observed and storage stability was evaluated. The evaluation criteria were as follows. "-" indicates that the test was not performed. ○: Transparent. △: Gelled. ×: Cloudiness, separation, etc. occurs.

[0051] [Foaming persistence test] <Dirty dishes> The model soil was a 1:1 mixture of beef tallow and soybean oil. 0.5 g of this oil was evenly applied to a 23 cm diameter round PEN (polyethylene naphthalate) resin dish to prepare soiled tableware.

[0052] <Cleaning method> The above-mentioned soiled dishes were washed using each detergent composition. Specifically, 20 g of a diluted solution of the detergent composition diluted 20 times was soaked in a sponge, and the sponge was rubbed five times to create a lather, and the soiled dishes were scrubbed until the stickiness disappeared. When the stickiness disappeared, scrubbing of the dish was stopped, and the same sponge was used to scrub new soiled dishes, and this was repeated until about 10 or so dishes were scrubbed. The dishes were then rinsed with water and air-dried.

[0053] <Evaluation method> The foaming persistence during washing was evaluated based on the number of dishes on which foaming was maintained. Specifically, the soiled dishes were scrubbed one by one using the above-mentioned washing method. If even a small amount of foam was generated during scrubbing, it was determined that foaming was maintained, and the number of dishes on which foaming was maintained during washing was counted. The evaluation criteria are as follows. Note that "-" indicates that the test was not performed. ◎: 9 or more ○: 7-8 sheets ×: 6 sheets or less

[0054] [Cleaning power test] <Cleaning method> The soiled dishes were washed using each detergent composition in the same manner as in the test for foam persistence during washing. <Evaluation method> The cleaning power (cleaning power durability) was evaluated based on the number of dishes that could be cleaned using the above cleaning method. Here, cleaning success was confirmed by detecting oil stains using Oil Red and visually confirming that no oil stains remained. The evaluation criteria are as follows. Note that "-" indicates that the test was not performed. ◎: 10 or more ○: 8-9 sheets ×: 7 sheets or less

[0055] [Table 1]

[0056] [Table 2]

[0057] The results of each test are shown in Tables 1 and 2. As shown in Tables 1 and 2, when a fatty acid N-methylalkanolamide was contained in addition to an amphoteric surfactant but no polyoxyalkylene alkyl ether (Comparative Example 3), and when a polyoxyalkylene alkyl ether was contained in addition to an amphoteric surfactant but no fatty acid N-methylalkanolamide (Comparative Examples 4 and 5), the detergents had excellent blending stability but poor foaming and detergency durability (Comparative Example 3 also had poor storage stability after dilution). In contrast, when a fatty acid N-methylalkanolamide and a polyoxyalkylene alkyl ether having an alkyl group with 10 or less carbon atoms were contained in addition to an amphoteric surfactant (Examples 1 to 10), the detergents had excellent storage stability after dilution and also excellent foaming and detergency durability. Furthermore, when the detergent composition contained, in addition to the amphoteric surfactant and fatty acid N-methylalkanolamide, a polyoxyalkylene alkyl ether having an alkyl group of 11 or more carbon atoms instead of the polyoxyalkylene alkyl ether having an alkyl group of 10 or less carbon atoms (Comparative Examples 1 and 2), the foaming duration and detergency duration were unexpectedly poor. Therefore, it was found that by blending a fatty acid N-methylalkanolamide and a polyoxyalkylene alkyl ether having an alkyl group of 10 or less carbon atoms in combination with an amphoteric surfactant in a liquid detergent composition for kitchen use, not only was the storage stability upon dilution excellent, but also the foaming duration and detergency duration could be improved.

[0058] Furthermore, the detergent compositions of Comparative Examples 6 to 10 contained various anionic surfactants in addition to the amphoteric surfactant and the fatty acid N-methylalkanolamide, but regardless of which anionic surfactant was contained, the compositions exhibited poor blend stability. This indicates that the inclusion of an anionic surfactant may reduce blend stability.

[0059] From the above, it has become clear that the present invention can provide a liquid dishwashing detergent composition that has excellent foaming durability and detergency durability, and also has excellent storage stability when diluted. [Industrial Applicability]

[0060] According to the present invention, it is possible to provide a liquid dishwashing detergent composition that has excellent foaming durability and detergency durability, and also has excellent storage stability when diluted.

Claims

1. (A) an amphoteric surfactant, (B) a fatty acid N-methylalkanolamide, and (C) a polyoxyalkylene alkyl ether; (C) The polyoxyalkylene alkyl ether is a polyoxyalkylene alkyl ether having a linear or branched alkyl group having 1 to 10 carbon atoms. A liquid dishwashing detergent composition.

2. 10. The liquid dishwashing detergent composition according to claim 1, which does not contain an anionic surfactant.

3. 2. The liquid dishwashing detergent composition according to claim 1, wherein the polyoxyalkylene alkyl ether (C) is a polyoxyalkylene alkyl ether having a linear or branched alkyl group having 8 or 10 carbon atoms.

4. 2. The liquid dishwashing detergent composition according to claim 1, wherein the pH is in the range of 6.0 to 8.0.

Images