Kitchen liquid detergent composition

Abstract

To provide a liquid detergent composition for a kitchen excellent in foaming durability and detergency durability, and also excellent in storage stability when diluted.SOLUTION: The present invention is a liquid detergent composition for kitchens comprising (A) an amphoteric surfactant and (B) an alkyl glycoside, wherein (A) the amphoteric surfactant comprises an amphoteric surfactant having an alkyl group or acyl group having 14 carbon atoms, the content of (A) the amphoteric surfactant in the detergent composition is 4% by mass or more, the content of an amphoteric surfactant having an alkyl group or acyl group having 12 carbon atoms in the detergent composition is less than 1% by mass, and (B) the alkyl glycoside comprises an alkyl glycoside having a linear alkyl group having an even number of 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 has an object to provide a liquid dishwashing detergent composition that 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-mentioned problems, the present inventors unexpectedly found that combining an amphoteric surfactant having an alkyl or acyl group with an alkyl glycoside having a linear alkyl group with an even number of carbon atoms is effective in solving the above-mentioned problems. More specifically, the present inventors found that while an amphoteric surfactant having an alkyl or acyl group with a carbon number of 14 is effective in increasing detergency when combined with an alkyl glycoside, the simultaneous use of a large amount of an amphoteric surfactant having an alkyl or acyl group with a carbon number of 12 reduces detergency, so the content must be limited. Furthermore, the present inventors found that while an alkyl glycoside is effective in improving foam persistence when combined with an amphoteric surfactant, the desired effect cannot be achieved unless the alkyl glycoside has a linear alkyl group with an even number of carbon atoms. Furthermore, the present inventors found that this combination also has excellent storage stability when diluted. Based on these findings, the present invention has been completed, as it has been found that a liquid dishwashing detergent composition containing an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms and an alkyl glycoside having a linear alkyl group with an even number of carbon atoms, with a limited content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms, can provide a liquid dishwashing detergent composition that has excellent foaming and detergency durability and also excellent storage stability when diluted. That is, the gist of the present invention is as follows.

[0007] [1] A liquid detergent composition for kitchen use, comprising (A) an amphoteric surfactant and (B) an alkylglycoside, wherein the amphoteric surfactant (A) comprises an amphoteric surfactant having an alkyl group or an acyl group having 14 carbon atoms, the content of the amphoteric surfactant (A) in the detergent composition is 4 mass% or more, the content of the amphoteric surfactant having an alkyl group or an acyl group having 12 carbon atoms in the detergent composition is less than 1 mass%, and the alkylglycoside (B) comprises an alkylglycoside having a linear alkyl group with an even number of carbon atoms. [2] The liquid dishwashing detergent composition according to [1], which does not contain an amphoteric surfactant having an alkyl group or an acyl group having 12 carbon atoms. [3] The liquid dishwashing detergent composition according to [1] or [2], which does not contain an anionic surfactant. [4] (B) The liquid dishwashing detergent composition according to any one of [1] to [3], containing only alkyl glycosides having a linear alkyl group with an even number of carbon atoms as alkyl glycosides. [5] The liquid dishwashing detergent composition according to any one of [1] to [4], wherein the amphoteric surfactant (A) further comprises an amphoteric surfactant having an alkyl group or an acyl group having 8 or 10 carbon atoms. [6] The liquid dishwashing detergent composition according to any one of [1] to [5], containing, as (A) an amphoteric surfactant, only an amphoteric surfactant having an alkyl group having 8, 10 or 14 carbon atoms. [7] The liquid dishwashing detergent composition according to any one of [1] to [6], containing, as (A) an amphoteric surfactant, only an amphoteric surfactant having an alkyl group having 14 carbon atoms. [8] The liquid dishwashing detergent composition according to any one of [1] to [7], which has a pH in the range of 6.0 to 8.0.

[0008] It should be noted that any two or more of the above configurations [1] to [8] 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 and (B) an alkylglycoside, wherein the amphoteric surfactant (A) comprises an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms, the content of the amphoteric surfactant (A) in the detergent composition is 4 mass% or more, the content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms in the detergent composition is less than 1 mass%, and the (B) alkylglycoside comprises an alkylglycoside having a straight-chain alkyl group with an even number of carbon atoms. The liquid dishwashing detergent composition of the present invention contains a combination of an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms and an alkylglycoside having a straight-chain alkyl group with an even number of carbon atoms, and by limiting the content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms, it achieves excellent foaming durability and detergency durability as well as excellent 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] The present invention is characterized by the use of an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms as the amphoteric surfactant (A). By using such an amphoteric surfactant in combination with the alkyl glycoside (B) described below, excellent foaming and detergency durability can be achieved, as well as excellent storage stability when diluted. Here, the content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms is limited to less than 1 mass%. The use of a large amount of an amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms simultaneously with the surfactant and alkyl glycoside reduces the improvement in detergency achieved by this combination in the detergent composition, and therefore this is restricted in the present invention. On the other hand, the simultaneous use of amphoteric surfactants other than the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms (e.g., betaine-type and amine oxide-type amphoteric surfactants) is permitted. It is also preferable not to use an amphoteric surfactant having a hydrocarbon group with 12 carbon atoms as the amphoteric surfactant (A).

[0014] Therefore, in the present invention, the amphoteric surfactant (A) includes an amphoteric surfactant having an alkyl or acyl group having 14 carbon atoms, and may further include an amphoteric surfactant having an alkyl or acyl group having 8 or 10 carbon atoms (i.e., an amphoteric surfactant having an alkyl group having 8 carbon atoms, an amphoteric surfactant having an acyl group having 8 carbon atoms, an amphoteric surfactant having an alkyl group having 10 carbon atoms, or an amphoteric surfactant having an acyl group having 10 carbon atoms). That is, the liquid dishwashing detergent composition of the present invention uses an amphoteric surfactant having an alkyl or acyl group having 14 carbon atoms as the amphoteric surfactant (A), but can also use surfactants other than amphoteric surfactants having an alkyl or acyl group having 12 carbon atoms, and preferably an amphoteric surfactant having an alkyl or acyl group having 8 or 10 carbon atoms. The liquid kitchen detergent composition of the present invention preferably contains, as (A) amphoteric surfactant, only amphoteric surfactants having an alkyl group or acyl group having 8, 10 or 14 carbon atoms, more preferably contains, as (A) amphoteric surfactant, only amphoteric surfactants having an alkyl group having 8, 10 or 14 carbon atoms, and particularly preferably contains, as (A) amphoteric surfactant, only amphoteric surfactants having an alkyl group having 14 carbon atoms.

[0015] In the present invention, the alkyl group or acyl group in the amphoteric surfactant having an alkyl group or acyl group having 14 carbon atoms is preferably linear, i.e., the amphoteric surfactant having an alkyl group or acyl group having 14 carbon atoms is preferably an amphoteric surfactant having a linear alkyl group or acyl group having 14 carbon atoms. In particular, an amphoteric surfactant having a linear alkyl group having 14 carbon atoms can be preferably used. Similarly, the alkyl group or acyl group in the amphoteric surfactant having an alkyl group or acyl group having 8 or 10 carbon atoms is preferably linear, i.e., the amphoteric surfactant having an alkyl group or acyl group having 8 or 10 carbon atoms is preferably an amphoteric surfactant having a linear alkyl group or acyl group having 8 or 10 carbon atoms. In particular, an amphoteric surfactant having a linear alkyl group having 8 or 10 carbon atoms can be preferably used.

[0016] Examples of betaine-type amphoteric surfactants include carboxylate-type surfactants such as myristyl dimethylaminoacetic acid betaine, myristate amidopropyl dimethylaminoacetic acid betaine, 2-alkyl-N-carboxymethyl imidazolinium betaine, and 2-alkyl-N-carboxyethyl imidazolinium betaine; and sulfonate-type surfactants such as myristyl dimethyl sulfobetaine and myristyl hydroxy sulfobetaine (those with 12 carbon atoms will be described later).As amphoteric surfactants having an alkyl or acyl group with 14 carbon atoms, myristyl dimethylaminoacetic acid betaine (also called myristyl betaine) and myristate amidopropyl dimethylaminoacetic acid betaine (also called myristate amidopropyl betaine) can be preferably used, and myristyl dimethylaminoacetic acid betaine is more preferably used.

[0017] Examples of amine oxide amphoteric surfactants include alkylamine oxide surfactants such as octyldimethylamine oxide, decyldimethylamine oxide, myristyldimethylamine oxide, palmityldimethylamine oxide, stearyldimethylamine oxide, myristyldiethylamine oxide, and myristyldihydroxyethylamine oxide; amidoamine oxide surfactants such as myristate amidopropyldimethylamine oxide; and alkyloxypropylamine oxide surfactants such as myristyloxypropylamine oxide (those with 12 carbon atoms will be described later).As an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms, myristyldimethylamine oxide can be preferably used.

[0018] Examples of amino acid type amphoteric surfactants include alkyldiaminoethylglycine hydrochloride, alkylpolyaminoethylglycine, alkylaminoethylglycine, alkyldi(aminoethyl)glycine, alkylpolyaminoethylglycine, and alkyl-β-alanine (those with 12 carbon atoms will be described later).

[0019] In addition, as the amphoteric surfactant of the present invention, for example, the following commercially available products can be used: GENAMINOX OC (octyldimethylamine oxide), GENAMINOX K-10 (decyldimethylamine oxide), GENAMINOX MY (myristyldimethylamine oxide) and the like from Global Amines; Rikabion A-200 (myristyldimethylaminoacetic acid betaine) and the like from New Japan Chemical; and Marpovister MAP (myristate amidopropyldimethylaminoacetic acid betaine) and the like from Matsumoto Yushi Pharmaceutical Co., Ltd.

[0020] 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.

[0021] The content of (A) amphoteric surfactant in the liquid dish detergent composition of the present invention is set to 4% by mass or more, but can be blended in any appropriate amount without any particular limitation 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 4.5% by mass or more. From the viewpoint of blend stability, the upper limit of the content of (A) amphoteric surfactant is preferably 30% 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 (A) amphoteric surfactant is preferably 4% by mass or more and 30% by mass or less, more preferably 4% by mass or more and 20% by mass or less, and even more preferably 4.5% by mass or more and 15% by mass or less.

[0022] Among the (A) amphoteric surfactants contained in the liquid kitchen detergent composition of the present invention, the proportion of the amphoteric surfactant having an alkyl or acyl group having 14 carbon atoms is not particularly limited as long as the effects of the present invention are achieved, and can be appropriately adjusted depending on the type of amphoteric surfactant to be simultaneously blended. From the viewpoint of detergency, however, it is, for example, 50% by mass or more, preferably 70% by mass or more, and more preferably 100% by mass (i.e., all of the (A) amphoteric surfactants contained in the liquid kitchen detergent composition are amphoteric surfactants having an alkyl or acyl group having 14 carbon atoms).

[0023] As described above, an amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms reduces the improvement in the detergency of the detergent composition of the present invention, so the lower its content, the better. Therefore, among the amphoteric surfactants (A) contained in the liquid kitchen detergent composition of the present invention, the proportion of amphoteric surfactants having an alkyl or acyl group with 12 carbon atoms is, for example, preferably less than 25 mass%, more preferably 20 mass% or less, even more preferably 10 mass% or less, and particularly preferably 0 mass% (i.e., the liquid kitchen detergent composition does not contain any amphoteric surfactants having an alkyl or acyl group with 12 carbon atoms).

[0024] Furthermore, the content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms in the liquid kitchen detergent composition of the present invention is limited to less than 1 mass %, but is preferably 0.9 mass % or less, more preferably 0.8 mass % or less, even more preferably 0.4 mass % or less, and particularly preferably 0 mass % (i.e., the liquid kitchen detergent composition does not contain any amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms).

[0025] Examples of amphoteric surfactants having an alkyl or acyl group with 12 carbon atoms in the present invention include lauryl dimethylamine oxide, lauryl dimethylaminoacetic acid betaine, lauric acid amidopropyl dimethylaminoacetic acid betaine, and lauryl diaminoethyl glycine, and examples thereof include the following commercially available products: GENAMNINOX K-12 (lauryl dimethylamine oxide) from Global Amins; Rikabion A-100 (lauryl dimethylaminoacetic acid betaine) from New Japan Chemical; Amphorex LB-2 (lauric acid amidopropyl dimethylaminoacetic acid betaine) from Miyoshi Oil & Fats; and Levon T-2 (lauryl diaminoethyl glycine) from Sanyo Chemical Industry Co., Ltd.

[0026] [(B) Alkyl glycoside] The liquid dishwashing detergent composition of the present invention contains (B) an alkyl glycoside. In the present invention, the (B) alkyl glycoside is an alkyl glycoside having a linear alkyl group with an even number of carbon atoms (i.e., the alkyl group in the alkyl glycoside has an even number of carbon atoms and is linear). As such an alkyl glycoside, any known alkyl glycoside in the art can be widely used without particular limitations. Such an alkyl glycoside can be represented, for example, by the following general formula, and any alkyl glycoside commonly used in the art can be appropriately selected and used. [ka] [In the formula, R 1 is a linear alkyl group having an even number of carbon atoms ranging from 2 to 22. n is 1 or more and preferably 1000 or less.

[0027] In the present invention, it is preferable to use only alkyl glycosides having a linear alkyl group with an even number of carbon atoms as the (B) alkyl glycoside. Therefore, it is preferable that the liquid dishwashing detergent composition of the present invention contains only alkyl glycosides having a linear alkyl group with an even number of carbon atoms. For this reason, for example, it is preferable that the liquid dishwashing detergent composition of the present invention does not contain alkyl glycosides in which the alkyl group is branched or the alkyl group has an odd number of carbon atoms.

[0028] In the liquid dishwashing detergent composition of the present invention, the alkyl glycoside may be used alone or in combination of two or more types. Furthermore, the term "alkyl glycoside" as used in the present invention includes alkyl monoglycosides, alkyl polyglycosides, and mixtures thereof.

[0029] More specifically, in the alkyl glycoside used in the present invention, the number of carbon atoms in the linear alkyl group is preferably an even number in the range of 2 to 22, and more preferably an even number in the range of 8 to 16 (i.e., 8, 10, 12, 14, 16). As long as it is within this range, it may be a single compound with any carbon number, or a mixture thereof. For example, when it is written as a C8,C10 alkyl glycoside, it means a mixture of a C8 alkyl glycoside and a C10 alkyl glycoside.

[0030] More specific examples include C8, C10, C12, C14, and C16 (mixed) alkyl glycosides and decyl glycosides, and C8, C10, C12, C14, and C16 (mixed) alkyl glycosides are particularly suitable.

[0031] (B) The alkyl glycoside may be, for example, the following commercially available products: Mydol 10 (a C10 linear alkyl group) and Mydol 12 (a C12 linear alkyl group), manufactured by Kao Corporation; and Glucopon 215UP (a C8 and C10 (mixed) linear alkyl group) and Glucopon 650EC (a C8, C10, C12, C14, and C16 (mixed) linear alkyl group), manufactured by BASF.

[0032] The content of (B) alkyl glycoside 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) alkyl glycoside is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 5% by mass or more, and particularly preferably 9% by mass or more. From the viewpoint of blending stability, the upper limit of the content of (B) alkyl glycoside is preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less. The numerical range of the content of (B) alkyl glycoside is preferably 0.1% by mass or more and 40% by mass or less, more preferably 1% by mass or more and 30% by mass or less, even more preferably 5% by mass or more and 25% by mass or less, and particularly preferably 9% by mass or more and 25% by mass or less.

[0033] The mass ratio of (A) amphoteric surfactant to (B) alkylglycoside [(A) / (B)] in the liquid dish detergent composition of the present invention is not particularly limited and can be adjusted appropriately depending on the types of amphoteric surfactant and alkylglycoside to be blended. From the viewpoints of detergency and foaming durability, the mass ratio is preferably 0.0025 to 300, more preferably 0.01 to 100, even more preferably 0.1 to 50, and particularly preferably 0.2 to 5.

[0034] 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).

[0035] 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.

[0036] The liquid dishwashing detergent composition of the present invention contains, for example, water as the balance other than the above components. The water contained in the liquid dishwashing 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.

[0037] The liquid dishwashing detergent composition of the present invention can be produced by mixing the above-mentioned components in a conventional manner.

[0038] [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 neutral pH results in a liquid dishwashing detergent composition that is less irritating to the skin and has an excellent feel when used.

[0039] <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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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]

[0044] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0045] Liquid dishwashing detergent compositions were prepared according to the compositions shown in Table 1 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 6.5 (25°C) by adding an appropriate amount of citric acid as a pH adjuster. In the following, "%" represents % by mass unless otherwise specified. The values ​​in parentheses in Table 1 are values ​​converted into pure contents.

[0046] [Ingredients] <Amphoteric surfactant> 23% Myristyldimethylamine oxide (C14 linear alkyl group): Trade name "GENAMNINOX MY" (liquid), manufactured by Global Amines 30% Myristyl Dimethylaminoacetic Acid Betaine (C14 linear alkyl group): Product name "Recabion A-200" (liquid), manufactured by New Japan Chemical Co., Ltd. 30% myristate amidopropyl dimethylaminoacetic acid betaine (C14 linear acyl group): Trade name "Marpovister MAP" (liquid), manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd. 30% lauryl dimethylamine oxide (C12 linear alkyl group): Trade name "GENAMNINOX K-12" (liquid), manufactured by Global Amines 30% lauryl dimethylaminoacetate betaine (C12 linear alkyl group): Product name "Recabion A-100" (liquid), manufactured by New Japan Chemical Co., Ltd. 30% lauric acid amidopropyl dimethylaminoacetic acid betaine (C12 linear acyl group): Trade name "Amphorex LB-2" (liquid), manufactured by Miyoshi Oil & Fats Co., Ltd. 30% decyldimethylamine oxide (C10 linear alkyl group): Trade name "GENAMNINOX K-10" (liquid), manufactured by Global Amines 30% Octyldimethylamine oxide (C8 linear alkyl group): Trade name "GENAMNINOX OC" (liquid), manufactured by Global Amines <Alkyl glucoside> 40% decyl glycoside (C10 linear alkyl group): Product name "Mydol 10" (liquid), manufactured by Kao Corporation 65% C8, C10 alkyl glycoside (C8, C10 (mixed) linear alkyl group): Glucopon 215UP (liquid), manufactured by BASF 50% C8, C10, C12, C14, C16 alkyl glycoside (C8, C10, C12, C14, C16 (mixed) linear alkyl groups): Glucopon 650EC (liquid), manufactured by BASF 65% 2-Ethylhexylglycoside (C8 branched alkyl group): Product name "AG6202" (liquid), manufactured by Nouryon 70% C7 alkyl glycoside (C7 linear alkyl group): Trade name "SIMULSOL SL 7G" (liquid), manufactured by SEPPIC 50% C11 alkyl glycoside (C11 linear alkyl group): Product name "SIMULSOL SL 11W" (liquid), manufactured by SEPPIC <Anionic surfactants> 70% Polyoxyethylene Lauryl Ether Sodium Sulfate: Product name "Alscope TH-370N" (Vaseline-like), manufactured by Toho Chemical Industry Co., Ltd. 93% sodium alkanesulfonate: Product name "WeylClean SAS93" (granular solid), manufactured by Azelis Japan Co., Ltd. 75% sodium diisooctyl sulfosuccinate: Trade name "Marpomase PT" (liquid), manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd. 40% C14 alpha-olefin sulfonate sodium: trade name "Lipolan LJ-441" (liquid), manufactured by Lion Specialty Chemicals

[0047] [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: ○: A transparent liquid. ×: Cloudiness, separation, gelation, etc. occurred.

[0048] [Storage stability test when diluted] Each detergent composition was diluted 10 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. ○: A transparent liquid. ×: Cloudiness, separation, gelation, etc. occurred.

[0049] [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.

[0050] <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 10 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.

[0051] <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. ◎: 8 or more ○: 6-7 sheets ×: 5 sheets or less

[0052] [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. ◎: 8 or more ○: 6-7 sheets ×: 5 sheets or less

[0053] [Odor Residual Test] First, 1 g of each detergent composition was applied to the hands. Then, the hands were rinsed with running water until all slime was removed. After washing, the odor of the hands was assessed by human olfactory confirmation to evaluate residual odor. The evaluation criteria were as follows. Note that "-" indicates that the test was not performed. ○: No smell was detected at all. ×: An odor was detected.

[0054] [Table 1-1]

[0055] [Table 1-2]

[0056] [Table 1-3]

[0057] [Table 1-4]

[0058] The results of each test are shown in Table 1. As shown in Table 1, the detergent compositions (Examples 1 to 10) containing a combination of an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms and an alkyl glycoside having a linear alkyl group with an even number of carbon atoms, in which the content of the amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms was limited to less than 1 mass %, exhibited excellent foaming and detergency durability, and also had excellent storage stability when diluted. Among these, the detergent compositions (Examples 1 to 8) that did not contain an amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms exhibited even more excellent foaming and detergency durability. However, the detergent compositions (Comparative Examples 11 to 13) that contained 1 mass % or more of an amphoteric surfactant having an alkyl or acyl group with 12 carbon atoms exhibited inferior foaming and detergency durability. In contrast, no decrease in foaming and detergency durability was observed when amphoteric surfactants other than the amphoteric surfactant having an alkyl group with 12 carbon atoms were used in combination without any particular limitation to low concentrations (Example 3). Therefore, it was found that a combination of an amphoteric surfactant having an alkyl or acyl group with a carbon number of 14 and an alkyl glycoside having a linear alkyl group with an even number of carbon atoms can improve foaming persistence and cleaning power durability, and also has excellent storage stability when diluted. It was also found that the use of an amphoteric surfactant having an alkyl group with a carbon number of 12 is acceptable if it is less than 1 mass%, and that a lower content is preferable from the viewpoint of foaming persistence and cleaning power durability. On the other hand, it was found that the use of amphoteric surfactants other than amphoteric surfactants having an alkyl group with a carbon number of 12 is acceptable without being limited to a particularly low concentration. It was also found that the use of myristyldimethylaminoacetic acid betaine and myristyldimethylamine oxide as amphoteric surfactants having an alkyl or acyl group with a carbon number of 14 can produce a detergent composition with better foaming persistence and cleaning power durability.

[0059] It was also found that the alkyl glycoside used in combination with an amphoteric surfactant must be an alkyl glycoside having a linear alkyl group with an even number of carbon atoms. Specifically, when alkyl glycosides with an odd number of carbon atoms in the alkyl group were used (Comparative Examples 3, 4, 9, and 10) or when alkyl glycosides with a branched alkyl group were used (Comparative Examples 1 and 2), it was not possible to obtain a detergent composition that exhibited excellent foaming and detergency durability and excellent storage stability when diluted. Furthermore, when alkyl glycosides with an even number of carbon atoms in the alkyl group were mixed with alkyl glycosides with an odd number of carbon atoms in the alkyl group (Comparative Examples 5 to 8), it was also not possible to obtain a detergent composition that exhibited excellent foaming and detergency durability and excellent storage stability when diluted. Therefore, it was found that the alkyl glycoside used in combination with an amphoteric surfactant must be an alkyl glycoside having an even number of carbon atoms in the linear alkyl group.

[0060] The detergent compositions of Reference Examples 1 to 8 contained various anionic surfactants in addition to an amphoteric surfactant and an alkyl glycoside, but a decrease in detergency (Reference Examples 1, 5, and 8) and a decrease in blend stability (Reference Examples 2 to 4, 6, and 7) were observed. Therefore, it was found that the addition of an anionic surfactant would reduce the performance of the detergent composition.

[0061] In addition, with regard to the evaluation of residual odor, it was found that the cleaning compositions (Examples 1 to 10) containing a combination of an amphoteric surfactant having an alkyl or acyl group with 14 carbon atoms and an alkyl glycoside having a linear alkyl group with an even number of carbon atoms did not leave a lingering odor and were also excellent in feel when used.

[0062] 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]

[0063] 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 liquid dishwashing detergent composition comprising (A) an amphoteric surfactant and (B) an alkyl glycoside, (A) the amphoteric surfactant includes an amphoteric surfactant having an alkyl group or an acyl group having 14 carbon atoms, the content of the amphoteric surfactant (A) in the detergent composition is 4% by mass or more, the content of the amphoteric surfactant having an alkyl group or an acyl group having 12 carbon atoms in the detergent composition is less than 1% by mass, (B) The alkyl glycoside includes an alkyl glycoside having a straight-chain alkyl group with an even number of carbon atoms. A liquid dishwashing detergent composition.

2. 2. The liquid dishwashing detergent composition according to claim 1, which does not contain an amphoteric surfactant having an alkyl group or an acyl group having 12 carbon atoms.

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

4. 2. The liquid dishwashing detergent composition according to claim 1, wherein the alkyl glycoside (B) is exclusively alkyl glycosides having a linear alkyl group with an even number of carbon atoms.

5. 2. The liquid dishwashing detergent composition according to claim 1, wherein the amphoteric surfactant (A) further comprises an amphoteric surfactant having an alkyl or acyl group having 8 or 10 carbon atoms.

6. 2. The liquid dishwashing detergent composition according to claim 1, wherein the amphoteric surfactant (A) is an amphoteric surfactant having an alkyl group having 8, 10 or 14 carbon atoms.

7. 2. The liquid dishwashing detergent composition according to claim 1, wherein the amphoteric surfactant (A) is an amphoteric surfactant having an alkyl group having 14 carbon atoms.

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

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