Liquid detergent composition

Abstract

To provide a liquid detergent composition which, even when having a little surfactant content, is excellent in washing power for both oil and fat dirt and sticky dirt containing carbohydrate and has good low-temperature stability.SOLUTION: A liquid detergent composition includes, in specific amounts: (a) an anionic surfactant (hereinafter referred to as (a) component); (b) an ampholytic or semipolar surfactant; (c) a diol compound; (d) aromatic sulfonic acid having a total carbon number of 9 or less or a salt thereof; and water. In the composition, the total content of all surfactants included in the composition is 30 mass% or less. The mass ratio ((a) / (b)) between the content of the (a) component and the content of the (b) component is 0.8 or more and 3.5 or less. The (a) component includes a specific alkyl sulfuric ester surfactant.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent composition, for example, a liquid detergent composition suitable for cleaning dishes, hard items around the kitchen, and the like. [Background technology]

[0002] Dirt that adheres to hard articles such as tableware includes carbohydrate stains, protein stains, oily stains, and composite stains of these. Among these, carbohydrate stains such as starch stick to hard articles when they dry and are particularly difficult to remove. Typical household methods for washing dishes include scrubbing dishes with a cleaning solution carried on a flexible porous member such as a sponge, and washing using a dishwasher. Liquid detergents for these uses are required to have not only excellent cleaning properties but also solution stability that prevents phase separation and crystal precipitation even in low-temperature winter environments.

[0003] Patent Document 1 discloses a liquid detergent composition that contains an anionic surfactant and an amphoteric surfactant in a specific mass ratio, and is formulated with a water-soluble solvent and a polyalkylene oxide containing propylene oxide units, thereby achieving both good cleaning power for oily stains and foaming properties. Furthermore, Patent Document 2 describes a cleaning agent for hard surfaces that contains an alkyl monoglyceryl ether of a specific structure, an anionic surfactant, an amine oxide surfactant, and citric acid (salt), and that exhibits high cleaning properties. Patent Document 3 discloses a liquid detergent composition that has good storage stability, high cleaning performance, and excellent antibacterial properties. The liquid detergent composition uses an anionic surfactant produced from naturally occurring raw materials as the main surfactant, in combination with an amine oxide surfactant or an amphoteric surfactant that form an ionic complex with the anionic surfactant, and also contains antibacterial metal ions, a hydrotrope agent, and an organic solvent. Patent Document 4 discloses a hand-washing dishwashing detergent composition that contains a sulfosuccinic acid alkyl ester (salt), an anionic surfactant, and a polypropylene glycol of a specific molecular weight, and that achieves both good foaming during washing and quick foam removal during rinsing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-196810 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-160870 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-202720 [Patent Document 4] Japanese Patent Application Laid-Open No. 2013-82847 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, in order to realize a sustainable society, there has been a demand in the field of detergents for both high cleaning performance and reduced environmental impact. Possible measures to reduce the environmental impact include using naturally derived ingredients that are easily returned to nature, and reducing the surfactant content in detergents without changing the amount of detergent used, in order to reduce CO2 emissions. However, with conventional technology, increasing the proportion of naturally derived ingredients in a surfactant required an increase in the amount of surfactant to ensure sufficient detergency against grease. Furthermore, as a result of the inventors' investigations, it was found that there is no correlation between the improvement of the detergency for oily stains and for sticky stains containing carbohydrates, and furthermore, that improving the detergency for sticky stains reduces the low-temperature stability. In light of these findings, the inventors have conducted further intensive investigations and have completed the present invention. The present invention provides a liquid detergent composition and a method for cleaning hard surfaces that have excellent detergency against both oily stains and stubborn stains containing carbohydrates, even when the surfactant content is low, and that have good low-temperature stability. [Means for solving the problem]

[0006] The present invention relates to a composition containing (a) an anionic surfactant (hereinafter referred to as component (a)) in an amount of 5% by mass to 20% by mass, (b) an amphoteric or semi-polar surfactant (hereinafter referred to as component (b)) in an amount of 5% by mass to 25% by mass, (c) a diol compound (hereinafter referred to as component (c)) in an amount of 0.1% by mass to 8% by mass, (d) an aromatic sulfonic acid or a salt thereof having a total carbon number of 9 or less (hereinafter referred to as component (d)), and water, wherein the total content of all surfactants contained in the composition is 30% by mass or less. The liquid detergent composition relates to a liquid detergent composition in which the mass ratio [(a) / (b)] of the content of component (a) to the content of component (b) is 0.8 or more and 3.5 or less, component (a) contains (a1) an alkyl sulfate ester-type surfactant [hereinafter referred to as component (a1)], component (a1) has one or more oxyalkylene groups selected from oxyethylene groups and oxypropylene groups, and the average number of moles of ethyleneoxy groups added is 2.5 or less and the average number of moles of propyleneoxy groups added is 1.0 or less.

[0007] The present invention also relates to a method for cleaning a hard surface, which comprises contacting the above-mentioned liquid detergent composition with the hard surface. [Effects of the Invention]

[0008] According to the present invention, a liquid detergent composition and a method for cleaning hard surfaces are provided that have excellent detergency against both oily stains and stubborn stains containing carbohydrates, even when the surfactant content is low, and that have good low-temperature stability. DETAILED DESCRIPTION OF THE INVENTION

[0009] The mechanism by which the liquid detergent composition of the present invention, even when it contains a small amount of surfactant, has excellent cleaning power against both oily stains and stains containing carbohydrates such as starch, especially stubborn stains containing carbohydrates (e.g., stains such as curry and pasta sauce that have dried on hard surfaces), and also has good low-temperature stability is not clear, but is presumed to be as follows. The cleaning properties of oily stains and sticky stains containing carbohydrates are different, and it is difficult to achieve a good cleaning performance for both types of stains. The liquid detergent composition of the present invention exhibits excellent cleaning performance for oily stains by containing an anionic surfactant (component (a)) and an amphoteric or semi-polar surfactant (component (b)). The anionic surfactant (component (a)) is an effective base for promoting the hydration of carbohydrates. However, the more the anionic charge is shielded by component (b), the less effective it is in promoting the hydration of carbohydrates, resulting in poor cleaning performance for carbohydrate-containing, stubborn stains. Therefore, by increasing the ratio of component (a) to component (b) without impairing the cleaning performance for oily stains, and further incorporating a diol compound (component (c)), the hydration of carbohydrates is promoted by component (a), particularly the alkyl sulfate ester salt, and component (c). This is presumably why a detergent composition with a low surfactant content can achieve both excellent cleaning performance for oily stains and excellent cleaning performance for carbohydrate-containing, stubborn stains. The liquid detergent composition and method for cleaning hard surfaces of the present invention are not limited to the above-mentioned mechanism of action.

[0010] <Liquid detergent composition> The liquid detergent composition of the present invention contains specific amounts of (a) an anionic surfactant (hereinafter referred to as component (a)), (b) an amphoteric or semi-polar surfactant (hereinafter referred to as component (b)), (c) a diol compound (hereinafter referred to as component (c)), (d) an aromatic sulfonic acid or a salt thereof having a total carbon number of 9 or less (hereinafter referred to as component (d)), and water, wherein the total content of all surfactants contained in the composition is 30 mass% or less, and component (a) contains (a1) an alkyl sulfate ester type surfactant (hereinafter referred to as component (a1)). The component (a1) has one or more oxyalkylene groups selected from an oxyethylene group and an oxypropylene group, and the average number of moles of the ethyleneoxy groups added is 2.5 or less, and the average number of moles of the propyleneoxy groups added is 1.0 or less.

[0011] <Component (a)> The component (a) is an anionic surfactant. One or more types of component (a) can be used in combination. The component (a) contains the component (a1).

[0012] The anionic surfactant of component (a) is preferably one or more anionic surfactants selected from alkylarylsulfonic acid surfactants, sulfate ester surfactants, alkanesulfonic acid surfactants, olefinsulfonic acid surfactants, alkyl or alkenyl sulfosuccinate ester surfactants, and sulfofatty acid ester surfactants.

[0013] Examples of the alkylarylsulfonic acid surfactant include alkylbenzenesulfonic acid and its salts, specifically alkylbenzenesulfonic acid and its salts, each having an alkyl group with preferably 6 or more, more preferably 8 or more, carbon atoms and preferably 18 or less, more preferably 15 or less.

[0014] Examples of sulfate ester surfactants include anionic surfactants having a hydrocarbon group having from 8 to 20 carbon atoms and a sulfate ester group. From the viewpoint of further enhancing detergency, the number of carbon atoms in the hydrocarbon group of the sulfate ester surfactant is preferably 8 or more, more preferably 10 or more, even more preferably 12 or more, and preferably 20 or less, more preferably 18 or less, even more preferably 14 or less. The hydrocarbon group is preferably an alkyl group. The sulfate surfactant is preferably an alkyl sulfate surfactant having an alkyl group with a carbon number within the above range, and among these, one or more selected from alkyl sulfates, polyoxyalkylene alkyl ether sulfates, and salts thereof are preferred. From the viewpoint of further improving the cleaning properties of stubborn dirt containing carbohydrates, the sulfate ester type surfactant is preferably at least one selected from alkyl sulfate esters corresponding to component (a1), polyoxyalkylene alkyl ether sulfate esters corresponding to component (a1), and salts thereof. The sulfate ester surfactant may include a sulfate ester surfactant that does not fall under the category of component (a1). Examples of the sulfate ester surfactant that does not fall under the category of component (a1) include alkenyl sulfate esters, polyoxyalkylene alkyl ether sulfate esters that do not fall under the category of component (a1), and salts thereof. When the polyoxyalkylene alkyl ether sulfate or its salt contains a plurality of different oxyalkylene groups, the different oxyalkylene groups may be bonded in block or random bonds.

[0015] <Component (a1)> Component (a1) is an alkyl sulfate ester surfactant. Component (a1) contains an alkyl sulfate ester surfactant having one or more oxyalkylene groups selected from oxyethylene groups and oxypropylene groups, with the average number of moles of oxyethylene groups added being 2.5 or less and the average number of moles of oxypropylene groups added being 1.0 or less. Component (a1) can be used alone or in combination of two or more types.

[0016] From the viewpoint of further improving the cleaning properties of stubborn stains containing oils and carbohydrates, component (a1) preferably contains an alkyl sulfate ester surfactant having no oxyalkylene group, and more preferably contains an alkyl sulfate ester surfactant having no oxyalkylene group and a polyoxyalkylene alkyl sulfate ester surfactant having an oxyalkylene group. Specific examples of polyoxyalkylene alkyl sulfate ester surfactants include polyoxyalkylene alkyl sulfate esters and salts thereof. When component (a1) has one or more oxyalkylene groups selected from an oxyethylene group and an oxypropylene group, component (a1) can contain an alkyl sulfate ester surfactant in which the average number of moles of oxyethylene groups added is 2.5 or less and the average number of moles of oxypropylene groups added is 1.0 or less.

[0017] The alkyl group of component (a1) is preferably a straight-chain or branched-chain alkyl group from the viewpoint of further improving the cleaning ability of stubborn stains including oils, fats, and carbohydrates. From the same viewpoint, the number of carbon atoms in the alkyl group is preferably 8 or more, more preferably 10 or more, even more preferably 12 or more, and preferably 18 or less, more preferably 16 or less, even more preferably 14 or less. The polyoxyalkylene alkyl sulfate or salt thereof of component (a1) has one or more oxyalkylene groups selected from oxyethylene and oxypropylene groups. When component (a1) contains oxyethylene and oxypropylene groups, the oxyethylene and oxypropylene groups may be bonded in either a block or random manner. The average number of moles of oxyethylene groups added in component (a1) is preferably 0 or more, more preferably 0.5 or more, even more preferably 1.0 or more, and is 2.5 or less, preferably 2.2 or less, more preferably 2.0 or less. The average number of moles of oxypropylene groups added in component (a1) is preferably 0 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and is 1.0 or less, preferably 0.8 or less, more preferably 0.7 or less.

[0018] From the viewpoint of further improving the cleaning properties of stubborn stains containing oils and carbohydrates, the polyoxyalkylene alkyl ether sulfate or its salt of component (a1) is preferably a polyoxyalkylene alkyl ether sulfate or its salt having an alkyl group with a carbon number in the above range, further a linear or branched alkyl group, and an oxyethylene group or oxypropylene group with an average number of moles added in the above range.

[0019] From the viewpoint of further improving the cleaning properties of stubborn stains containing oils, fats, and carbohydrates, the component (a) contains the component (a1) in an amount of preferably 20% by mass or more, more preferably 50% by mass or more, even more preferably 80% by mass or more, and preferably 100% by mass or less, more preferably 95% by mass or less, even more preferably 90% by mass or less.

[0020] <Component (a1-1)> From the viewpoint of improving the cleaning power for stubborn stains by promoting the hydration of carbohydrates, component (a) preferably contains (a1-1) an alkyl sulfate ester or salt thereof having an alkyl group having from 8 to 16 carbon atoms and no oxyalkylene group (hereinafter referred to as component (a1-1)). Therefore, from the same viewpoint, component (a1) preferably contains component (a1-1). The alkyl group of component (a1-1) is preferably a straight-chain or branched-chain alkyl group from the viewpoint of improving the cleaning power for stubborn stains by promoting hydration of the carbohydrate, and from the same viewpoint, the number of carbon atoms in the alkyl group is 8 or more, preferably 10 or more, more preferably 12 or more, and 16 or less, preferably 14 or less.

[0021] When component (a) contains component (a1-1), from the viewpoint of promoting hydration of carbohydrates, component (a) preferably contains component (a1-1) in an amount of 15% by mass or more, more preferably 20% by mass or more, even more preferably 25% by mass or more, and preferably 100% by mass or less, more preferably 85% by mass or less, even more preferably 50% by mass or less. In this specification, the content of the component (a1-1) in the detergent composition includes the content of the component (a1-1) contained in the component (a1-2), which will be described in detail later.

[0022] <Component (a1-2)> From the viewpoint of further improving the cleaning properties of stubborn stains containing oils and carbohydrates, component (a) preferably contains component (a1-1) and (a1-2) a polyoxyalkylene alkyl sulfate or a salt thereof having an alkyl group having from 8 to 16 carbon atoms and having one or more oxyalkylene groups selected from an oxyethylene group and an oxypropylene group [hereinafter referred to as component (a1-2)]. Therefore, from the same viewpoint, component (a1) preferably contains component (a1-1) and component (a1-2). In a typical production method, component (a1-2) is a compound having a distribution of oxyethylene groups and / or oxypropylene groups, and component (a1-2) contains component (a1-1). Therefore, when component (a) and component (a1) contain component (a1-2), it can be said that the composition contains components (a1-1) and (a1-2).

[0023] The alkyl group of component (a1-2) is preferably a straight-chain or branched-chain alkyl group from the viewpoint of further improving the cleaning ability of stubborn stains including oils, fats, and carbohydrates. Also, from the same viewpoint, the number of carbon atoms in the alkyl group is 8 or more, preferably 10 or more, more preferably 12 or more, and 16 or less, preferably 14 or less. The average number of moles of oxyethylene groups added in the component (a1-2) is preferably 0 or greater, preferably greater than 0, more preferably 0.5 or greater, even more preferably 1.0 or greater, and is 2.5 or less, preferably 2.2 or less, more preferably 2.0 or less. The average number of moles of oxypropylene groups added in component (a1-2) is preferably 0 or more, more preferably greater than 0, even more preferably 0.3 or more, even more preferably 0.5 or more, and is 1.0 or less, preferably 0.8 or less, more preferably 0.7 or less. The component (a1-2) preferably has an oxyethylene group or an oxypropylene group, more preferably an oxypropylene group. When the component (a1-2) contains an oxyethylene group and an oxypropylene group, the oxyethylene group and the oxypropylene group may be bonded in a block or random manner.

[0024] When component (a) contains component (a1-2), from the viewpoint of further improving the cleaning properties of stubborn stains containing oils and carbohydrates, component (a) preferably contains component (a1-2) in an amount of at least 20 mass%, more preferably at least 50 mass%, even more preferably at least 80 mass%, and preferably at most 90 mass%, more preferably at most 85 mass%.

[0025] The (a1-2) component is a compound having a distribution of oxyethylene groups and / or oxypropylene groups, and may also include alkyl sulfates or salts thereof in which the number of moles of oxyethylene and oxypropylene groups added is 0. The average number of moles added of the (a1-2) component is calculated including the alkyl sulfates or salts thereof contained in the (a1-2) component. Therefore, in this specification, unless otherwise specified, the amount of the (a1-2) component containing the alkyl sulfate or salt thereof is referred to as the content of the (a1-2) component. Furthermore, when the (a1-2) component is used in combination with a separately prepared (a1-1) component, the separately prepared (a1-1) component is not taken into consideration when calculating the average number of moles of the (a1-2) component added.

[0026] Examples of sulfate ester surfactants that do not fall under the category of component (a1) include polyoxyalkylene alkyl ether sulfate esters and salts thereof that do not fall under the category of component (a1). Examples of polyoxyalkylene alkyl ether sulfates or salts thereof that do not fall under the category of component (a1) include polyoxyalkylene alkyl ether sulfates or salts thereof that have a linear or branched alkyl group having at least 8, preferably at least 10 and at most 20, preferably at most 18, more preferably at most 14, and even more preferably at most 12 carbon atoms, have one or more oxyalkylene groups selected from oxyalkylene groups having at least 2 but not more than 3 carbon atoms, and have an average number of moles of oxyethylene groups added that exceeds 2.5 and preferably at most 6, more preferably at most 3, or have an average number of moles of oxypropylene groups added that exceeds 1.0 and preferably at most 3. The oxyalkylene group is preferably an oxyethylene group having 2 carbon atoms.

[0027] Examples of alkanesulfonic acid surfactants include alkanesulfonic acids or salts thereof having an alkane moiety with 8 or more, preferably 10 or more, more preferably 14 or more, and 20 or less, preferably 18 or less carbon atoms.

[0028] Examples of olefin sulfonic acid surfactants include α-olefin sulfonic acid or its salts, and internal olefin sulfonic acid or its salts. The α-olefin sulfonic acid or its salts have, for example, an olefin moiety with 8 or more carbon atoms, preferably 10 or more, more preferably 14 or more, and 22 or less, preferably 20 or less, and more preferably 18 or less. The internal olefin sulfonic acid or its salts have, for example, an olefin moiety with 8 or more carbon atoms, preferably 12 or more, more preferably 16 or more, and 24 or less, preferably 20 or less, and more preferably 18 or less.

[0029] Examples of sulfosuccinate alkyl or alkenyl ester surfactants include (a2) sulfosuccinate mono- or diesters or salts thereof having a hydrocarbon group having from 5 to 18 carbon atoms [hereinafter referred to as component (a2)].

[0030] <(a2) component> From the viewpoint of achieving a balance between cleaning performance for oily stains and sticky stains containing carbohydrates, it is preferable that component (a) also contains component (a2). From the viewpoint of achieving a balance between the ability to clean both oily and grease stains and sticky stains containing carbohydrates, the component (a2) is preferably a sulfosuccinic acid mono- or diester or a salt thereof having a hydrocarbon group with 5 or more carbon atoms, preferably 6 or more, more preferably 7 or more, and even more preferably 9 or more, and 18 or less, preferably 14 or less, and more preferably 10 or less [hereinafter referred to as component (a2)]. The hydrocarbon group may be an alkyl group or an alkenyl group, preferably an alkyl group, more preferably a branched alkyl group. From the viewpoint of achieving a balance between cleaning properties for both oily stains and stubborn stains containing carbohydrates, component (a2) is preferably a sulfosuccinic acid diester or a salt thereof. From the viewpoint of achieving a balance between cleaning properties for both oily and greasy soils and sticky soils containing carbohydrates, the hydrocarbon group of component (a2) is preferably a branched alkyl group selected from a branched octyl group, a branched decyl group, and a branched dodecyl group, more preferably a group selected from a 2-ethylhexyl group and a 2-propylheptyl group, and even more preferably a 2-propylheptyl group.

[0031] When component (a) contains component (a2), from the viewpoint of achieving a balance between cleaning properties for both oily stains and sticky stains containing carbohydrates, component (a) preferably contains component (a2) in an amount of 5% by mass or more, more preferably 10% by mass or more, and even more preferably 15% by mass or more, and from the viewpoint of further improving low-temperature stability, preferably contains component (a2) in an amount of 80% by mass or less, more preferably 50% by mass or less, and even more preferably 20% by mass or less.

[0032] Examples of sulfofatty acid ester surfactants include α-sulfofatty acids or salts thereof having 10 to 18 carbon atoms in the fatty acid moiety, and α-sulfofatty acid lower alkyl esters or salts thereof having 10 to 18 carbon atoms in the fatty acid moiety and 1 to 5 carbon atoms in the ester moiety (the lower alkyl preferably has 1 to 3 carbon atoms).

[0033] The component (a) is preferably one or more anionic surfactants selected from alkyl sulfate esters having an alkyl group with 8 to 18 carbon atoms, polyoxyalkylene alkyl ether sulfate esters having an alkyl group with 8 to 18 carbon atoms, mono- or diesters of fatty alcohols having 5 to 18 carbon atoms and sulfosuccinic acid, and salts thereof.

[0034] Examples of salts of component (a), and further of component (a1), component (a1-1), component (a1-2), and component (a2), include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts, and organic amine salts such as ammonium salts, monoethanolamine salts, diethanolamine salts, and triethanolamine salts, with alkali metal salts being preferred, and sodium salts being more preferred. Specific examples of salts of component (a), component (a1), component (a1-1), component (a1-2), and component (a2) also include the above-mentioned salts.

[0035] <(b) Component> The component (b) is an amphoteric or semi-polar surfactant. One or more types of the component (b) can be used in combination. Examples of the amphoteric surfactant of component (b) include betaine type surfactants and sulfobetaine type surfactants. Furthermore, examples of the semi-polar surfactant of component (b) include amine oxide surfactants, and further amine oxide surfactants having one hydrocarbon group having 8 to 18 carbon atoms. Examples of the component (b) include one or more surfactants selected from tertiary amine oxide surfactants, sulfobetaine surfactants, and carbobetaine surfactants.

[0036] From the viewpoint of further enhancing the cleaning properties against oily stains, the tertiary amine oxide surfactant is preferably a tertiary amine oxide surfactant in which one of the groups bonded to the nitrogen atom is an alkyl group having from 8 to 18 carbon atoms, which may be interrupted by an amide group or an ester group, preferably an alkyl group having from 8 to 16 carbon atoms, more preferably an alkyl group having from 8 to 14 carbon atoms, and the remaining groups are alkyl groups having from 1 to 3 carbon atoms, preferably a methyl group.

[0037] From the viewpoint of further enhancing the cleaning ability against oily stains, the sulfobetaine surfactant is preferably a compound having one alkyl group having 10 or more and 18 or less, preferably 16 or less, and more preferably 14 or less, carbon atoms, two alkyl groups having 1 to 3 carbon atoms, preferably two methyl groups, and a 3-sulfopropyl group or a 2-hydroxy-3-sulfopropyl group.

[0038] From the viewpoint of further enhancing the cleaning ability against oily stains, the carbobetaine surfactant is preferably a carbobetaine surfactant having one alkyl group having 10 or more carbon atoms and 18 or less, preferably 16 or less, more preferably 14 or less, which may be interrupted by an amide group or an ester group, two alkyl groups having 1 to 3 carbon atoms, preferably methyl groups, and one carboxyalkyl group, preferably carboxymethyl group.

[0039] From the viewpoint of further enhancing the cleaning power against oily stains, component (b) is preferably a betaine surfactant, more preferably one or more surfactants selected from sulfobetaine surfactants and carbobetaine surfactants, and even more preferably a sulfobetaine surfactant.

[0040] <(c) component> Component (c) is a diol compound. Component (c) can be used alone or in combination of two or more. From the viewpoint of further improving the cleaning properties of stubborn dirt containing carbohydrates, component (c) is preferably a diol compound having two or more carbon atoms, more preferably three or more, and from the same viewpoint, preferably ten or less, more preferably four or less.

[0041] From the viewpoint of further improving the cleaning properties of stubborn dirt containing carbohydrates, component (c) is preferably one or more selected from ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, and decanediol, and more preferably one or more selected from ethylene glycol and propylene glycol.

[0042] <(d) component> Component (d) is an aromatic sulfonic acid or its salt having a total carbon number of 9 or less. Component (d) can be used alone or in combination with two or more types. The total carbon number of component (d) does not include the carbon atoms contained in the counter ion of the aromatic sulfonic acid. From the viewpoint of further improving the cleaning properties for stubborn dirt containing carbohydrates and the low-temperature stability, component (d) is preferably one or more selected from 4-cumenesulfonic acid, p-toluenesulfonic acid, m-xylenesulfonic acid, and salts thereof.

[0043] Examples of salts of component (d) include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts, ammonium salts, and organic amine salts such as monoethanolamine salts, diethanolamine salts, and triethanolamine salts, with alkali metal salts being preferred, and sodium salts being more preferred.

[0044] <Water> The water may be deionized water, sterilized deionized water, distilled water, or hypochlorous acid sterilized water in which hypochlorous acid is dissolved at a concentration of about 0.5 to 10 ppm as another component. Hypochlorous acid may also be added during formulation.

[0045] <Composition, etc.> The liquid detergent composition of the present invention contains component (a) in an amount of 5% by mass or more, preferably 7% by mass or more, more preferably 9% by mass or more, in order to further enhance the cleaning properties of stubborn stains containing oils, fats, and carbohydrates, and from the same viewpoint, in an amount of 20% by mass or less, preferably 18% by mass or less, more preferably 15% by mass or less. In the liquid detergent composition of the present invention, the masses of the components (a), (a1), (a1-1), (a1-2) and (a2) are specified in terms of their sodium salts.

[0046] The liquid detergent composition of the present invention contains component (a1) in an amount of preferably 5% by mass or more, more preferably 6% by mass or more, and even more preferably 8% by mass or more, in order to further improve the cleaning ability of stubborn stains containing oils and carbohydrates, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less, in order to further improve the cleaning ability of grease stains.

[0047] When the liquid detergent composition of the present invention contains component (a1-1), the liquid detergent composition of the present invention contains component (a1-1) in an amount of preferably 1.0% by mass or more, more preferably 2% by mass or more, even more preferably 3% by mass or more, in order to further enhance the cleaning power for stubborn stains by promoting the hydration of carbohydrates, and from the same viewpoint, preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less.

[0048] When the liquid detergent composition of the present invention contains the component (a1-2), the liquid detergent composition of the present invention contains the component (a1-2) in an amount of preferably 3% by mass or more, more preferably 5% by mass or more, and even more preferably 7% by mass or more, in order to further enhance the cleaning properties of stubborn stains containing oils, fats, and carbohydrates. From the same viewpoint, the liquid detergent composition of the present invention contains the component (a1-2) in an amount of preferably 15% by mass or less, more preferably 10% by mass or less.

[0049] When the liquid detergent composition of the present invention contains component (a2), the liquid detergent composition of the present invention contains component (a2) in an amount of preferably 1% by mass or more, more preferably 1.5% by mass or more, even more preferably 2% by mass or more, in order to further improve the cleaning properties of stubborn stains containing oils, fats, and carbohydrates, and from the same viewpoint, preferably 5% by mass or less, more preferably 4% by mass or less, even more preferably 3% by mass or less.

[0050] The liquid detergent composition of the present invention contains component (b) in an amount of 5% by mass or more, preferably 6% by mass or more, more preferably 8% by mass or more, in order to further enhance the cleaning power for oily stains, and from the same viewpoint, in an amount of 25% by mass or less, preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less.

[0051] In the liquid detergent composition of the present invention, the mass ratio of the content of component (a) to the content of component (b) [(a) / (b)] is, from the viewpoint of further enhancing the detergency for oily stains, 0.8 or more, preferably 0.80 or more, more preferably 1 or more, even more preferably 1.0 or more, even more preferably 1.1 or more, even more preferably 1.2 or more, and from the same viewpoint, is 3.5 or less, preferably 2 or less, more preferably 2.0 or less, even more preferably 1.8 or less, even more preferably 1.6 or less.

[0052] The liquid detergent composition of the present invention contains component (c) in an amount of 0.1% by mass or more, preferably 0.5% by mass or more, more preferably 0.8% by mass or more, and even more preferably 1% by mass or more, in order to further enhance the cleaning properties of stubborn stains containing carbohydrates, and from the same viewpoint, in an amount of 8% by mass or less, preferably 6% by mass or less, more preferably 4% by mass or less, and even more preferably 3.5% by mass or less.

[0053] In the liquid detergent composition of the present invention, the mass ratio of the content of component (a) to the content of component (c) [(a) / (c)] is preferably 1.0 or more, more preferably 3 or more, and even more preferably 5 or more, from the viewpoint of further improving the cleaning ability of stubborn stains containing carbohydrates, and from the same viewpoint, is preferably 100 or less, more preferably 60 or less, and even more preferably 10 or less.

[0054] The liquid detergent composition of the present invention contains component (d) in an amount of preferably 1% by mass or more, more preferably 5% by mass or more, and even more preferably 9% by mass or more in order to further enhance low-temperature stability, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less in order to further enhance the cleaning ability for grease stains and the low-temperature stability. In the liquid detergent composition of the present invention, the mass of component (d) is determined by converting it into an acid form.

[0055] In the liquid detergent composition of the present invention, the mass ratio of the content of component (d) to the content of component (b) [(d) / (b)] is preferably 0.3 or more, more preferably 0.4 or more, and even more preferably 0.6 or more, from the viewpoint of further improving the cleaning ability of stubborn stains containing carbohydrates, and from the same viewpoint, is preferably 5 or less, more preferably 3 or less, and even more preferably 2 or less.

[0056] In the liquid detergent composition of the present invention, the total content of all surfactants contained in the composition is preferably 15% by mass or more, more preferably 17% by mass or more, and even more preferably 19% by mass or more, from the viewpoint of further improving the cleaning ability for oily stains and for sticky stains containing carbohydrates, and is 30% by mass or less, preferably 27% by mass or less, more preferably 26% by mass or less, and even more preferably 24% by mass or less, from the viewpoint of reducing the environmental load. The total content of all surfactants contained in the liquid detergent composition of the present invention may be the total content of component (a), component (b), component (e) described below, and cationic surfactant.

[0057] The liquid detergent composition of the present invention contains water. Water is used as the balance other than the components (a) to (d) and any optional components. From the viewpoint of adjusting the viscosity to a suitable level and fully exhibiting the effects of the present invention, the liquid detergent composition of the present invention contains water in an amount of preferably 30% by mass or more, more preferably 50% by mass or more, and preferably 85% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less. The liquid detergent composition of the present invention may be in the form of a liquid composition in which the above components are dissolved and / or dispersed and / or emulsified in water. The liquid detergent composition of the present invention may be in the form of, for example, an aqueous solution.

[0058] <(e) component> The liquid detergent composition of the present invention may optionally contain (e) a nonionic surfactant (hereinafter referred to as component (e)). Component (e) may be used alone or in combination of two or more types. The nonionic surfactant of component (e) may be one or more nonionic surfactants selected from alkyl ether type nonionic surfactants, glycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl glycoside type surfactants, and alkyl glyceryl ether type surfactants.

[0059] The alkyl ether nonionic surfactant of component (e) is, from the viewpoint of further enhancing detergency and foaming properties, a nonionic surfactant in which an alkylene oxide having 2 or 3 carbon atoms, preferably ethylene oxide, is added to a branched fatty alcohol or secondary fatty alcohol having an alkyl group of 9 to 18 carbon atoms, preferably 9 to 15 carbon atoms, in an average of 3 to 30 moles, preferably 3 to 20 moles, more preferably 3 to 15 moles.

[0060] The glycerin fatty acid ester, sorbitan fatty acid ester, and sucrose fatty acid ester of component (e) include esters of glycerin, sorbitan, or sucrose with a fatty acid having from 8 to 20 carbon atoms, respectively.

[0061] The alkyl glycoside surfactant of component (e) is preferably a compound represented by the following general formula (e1), from the viewpoint of further enhancing foaming properties and low-temperature stability. R 1e -(OR 2e ) x G y (e1) [In the formula, R 1e is a linear alkyl group having 8 or more, preferably 10 or more, carbon atoms in the chain from the viewpoint of further enhancing foaming properties and low-temperature stability, and from the same viewpoint, 18 or less, preferably 16 or less, more preferably 14 or less, R 2e is an alkylene group having 2 to 4 carbon atoms, preferably an ethylene group or a propylene group, more preferably an ethylene group; G is a residue derived from a reducing sugar; x is a number having an average value of 0 to 6; and y is a number having an average value of 1 to 10, preferably 5 or less, more preferably 2 or less.

[0062] In the compound of general formula (e1), G is a residue derived from a reducing sugar, and the reducing sugar used as the raw material for G may be either an aldose or a ketose. Examples of the reducing sugar used as the raw material for G include triose (having three carbon atoms), tetrose (having four carbon atoms), pentose (having five carbon atoms), and hexose (having six carbon atoms). Specific examples of the aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, gulose, aldose, idose, talose, and xylose. Specific examples of the ketose include fructose. Among these, the reducing sugar used as the raw material for G in the present invention is preferably an aldopentose (having five carbon atoms) or an aldohexose (having six carbon atoms), more preferably glucose, from the viewpoint of further enhancing foaming properties and low-temperature stability.

[0063] The alkyl glyceryl ether surfactant of component (e) includes an alkyl glyceryl ether surfactant having one alkyl group having 4 or more carbon atoms, preferably 6 or more, more preferably 8 or more, and 18 or less, preferably 14 or less, more preferably 12 or less, and even more preferably 10 or less. The alkyl group is preferably a branched alkyl group having 8 to 12 carbon atoms.

[0064] The alkyl glyceryl ether surfactant of component (e) may be one or more compounds selected from the group consisting of compounds represented by the following general formula (e2), from the viewpoint of further enhancing cleaning power and foaming properties. R 3e -O-(Gly) r -H (e2) [In the formula, R 3e represents a linear or branched alkyl group having from 4 to 10 carbon atoms, Gly represents a structural unit derived from glycerin, preferably a residue obtained by removing one hydroxyl group and one hydrogen atom from glycerin, and r represents a number of from 1 to 3.

[0065] In general formula (e2), R 3eFrom the viewpoint of further enhancing cleaning power and foaming properties, R is an alkyl group having 4 or more carbon atoms, preferably 6 or more carbon atoms, more preferably 8 or more carbon atoms, and from the same viewpoint, 10 or less carbon atoms. As the alkyl group, a straight-chain alkyl group such as a hexyl group, a heptyl group, an octyl group, a nonyl group, or a decyl group can be used, but in the present invention, from the viewpoint of further enhancing sterilizing performance, an alkyl group having a branched chain is preferred, and R 3e Specific examples of the branched alkyl group include a group selected from the group consisting of 2-ethylhexyl, 2-propylheptyl, sec-octyl, isononyl, and isodecyl, and a 2-ethylhexyl or 2-propylheptyl group is even more preferred.

[0066] In the general formula (e2), from the viewpoint of further improving the bactericidal performance in addition to the effects of the present invention, r is preferably 1 or more and preferably 2 or less, and r is more preferably 1. In the compound represented by the general formula (e2), from the viewpoint of further improving the bactericidal performance in addition to the effects of the present invention, R 3e More preferred are compounds in which is a 2-ethylhexyl group or a 2-propylheptyl group and r is 1. The structure represented by Gly is either a structure represented by -CH2CH(OH)CH2-O- in which the hydroxyl groups at the 1st and 3rd positions of glycerin are bonded, or a structure represented by -CH(CH2OH)CH2-O- in which the hydroxyl groups at the 1st and 2nd positions of glycerin are bonded, and varies depending on the catalyst and reaction conditions.

[0067] From the viewpoint of further enhancing cleaning power and foaming properties, component (e) is preferably one or more nonionic surfactants selected from alkyl glyceryl ether surfactants and alkyl glycoside surfactants, and more preferably one or more nonionic surfactants selected from alkyl monoglyceryl ethers and alkyl polyglycosides.

[0068] When the liquid detergent composition of the present invention contains component (e), the composition contains component (e) in an amount of preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 1.5% by mass or more, in order to further enhance detergency and foamability, and from the same viewpoint, preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less.

[0069] <Component (f)> The liquid detergent composition of the present invention may optionally contain (f) a water-soluble organic solvent (excluding component (c)) (hereinafter referred to as component (f)). Component (f) may be used alone or in combination of two or more types. "Water-soluble" in component (f) means that 0.1 g or more dissolves in 100 g of water at 25°C.

[0070] The component (f) is preferably one or more water-soluble organic solvents selected from (f1) monohydric alcohols (hereinafter referred to as component (f1)) and (f2) glycol ether-based water-soluble organic solvents (hereinafter referred to as component (f2)), each having 2 or more carbon atoms, preferably 3 or more carbon atoms, and 12 or less carbon atoms, preferably 10 or less carbon atoms, and more preferably 8 or less carbon atoms. The component (f1) can be a monohydric alcohol having 2 to 4 carbon atoms. Examples of the component (f2) include monoalkyl (methyl, ethyl, propyl, or butyl), monophenyl, or monobenzyl ethers of mono-, di-, tri-, or tetraalkylene glycols having an alkylene glycol unit with 2 or more and 4 or less carbon atoms. Examples of component (f2) include propylene glycol monoethyl ether, diethylene glycol monobutyl ether (also known as butyl diglycol), dipropylene glycol monobutyl ether, triethylene glycol monobutyl ether (also known as butyl triglycol), phenoxyethanol, phenoxytriethylene glycol, and phenoxyisopropanol. The component (f) is preferably one or more water-soluble organic solvents selected from ethanol, dipropylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, phenoxyethanol, and phenoxyisopropanol.

[0071] From the viewpoint of further improving low-temperature stability, the component (f) preferably has an alkoxy group, and further preferably contains one or more selected from the above component (f2), more preferably contains one or more selected from diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, and dipropylene glycol monobutyl ether, and even more preferably contains diethylene glycol monobutyl ether.

[0072] When the liquid detergent composition of the present invention contains component (f), the composition contains component (f) in an amount of preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more in order to further enhance low-temperature stability, and preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less in order to further enhance the cleaning ability for stubborn stains containing oils, fats, and carbohydrates.

[0073] When the liquid detergent composition of the present invention contains component (f), the mass ratio of the content of component (f) to the content of component (c) in the composition [(f) / (c)] is preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, and preferably 5 or less, more preferably 3 or less, even more preferably 2 or less, from the viewpoint of further improving low-temperature stability and cleaning properties for stubborn stains including oils, fats, and carbohydrates.

[0074] When the liquid detergent composition of the present invention contains component (f2), the composition contains component (f2) in an amount of preferably 1% by mass or more, more preferably 2% by mass or more, and even more preferably 3% by mass or more in order to further enhance low-temperature stability, and preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 5% by mass or less in order to further enhance the cleaning ability for stubborn stains containing oils, fats, and carbohydrates.

[0075] When the liquid detergent composition of the present invention contains component (f2), the mass ratio of the content of component (f2) to the content of component (c) in the composition [(f2) / (c)] is preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, and preferably 5 or less, more preferably 3 or less, even more preferably 2 or less, from the viewpoint of further improving low-temperature stability and cleaning performance for stubborn stains including oils, fats, and carbohydrates.

[0076] The liquid detergent composition of the present invention may optionally contain ingredients such as anti-gelling agents, thickeners such as polyacrylic acid, one or more sequestering agents selected from hydroxycarboxylic acids, aminopolycarboxylic acids and their salts, fragrances, dyes, pigments, disinfectants such as hypochlorous acid, preservatives, pH adjusters, etc., within the range that does not impair the effects of the present invention.

[0077] The pH of the liquid detergent composition of the present invention at 25°C is preferably 4 or higher, more preferably 5 or higher, and preferably 9 or lower, more preferably 8 or lower. This pH is measured by the following method. The pH of the composition can be adjusted using, for example, an inorganic acid selected from sulfuric acid, hydrochloric acid, and phosphoric acid; an organic acid selected from citric acid, malic acid, maleic acid, fumaric acid, succinic acid, acetic acid, formic acid, and lactic acid; or an inorganic alkali agent such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, sodium carbonate, or potassium carbonate. In the present invention, it is preferable to impart buffering ability to the composition from the viewpoint of further enhancing foaming ability / foam persistence, and it is suitable to use the organic acid, preferably citric acid, in combination with an inorganic alkali agent. The organic acid may be incorporated into the composition in the form of its sodium salt or potassium salt.

[0078] <Method for Measuring pH> Connect a composite electrode for pH measurement (for example, "Calmemo" Strong GST-5841C manufactured by Toa DKK Corporation) with a saturated potassium chloride aqueous solution (25%) as the internal solution of the pH electrode to a pH meter (for example, pH meter HM-42X manufactured by Toa DKK Corporation). Next, fill 100 mL beakers with pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) respectively, and immerse them in a constant temperature bath at 25°C for 30 minutes. Immerse the pH measurement electrode in the temperature-adjusted standard solution for 3 minutes, and perform calibration operations in the order of pH 6.86 → pH 9.18 → pH 4.01. Adjust the liquid detergent composition to be measured to 25°C, immerse the electrode of the above pH meter in the sample, and measure the pH after 3 minutes.

[0079] The viscosity of the liquid detergent composition of the present invention, and further the viscosity of the liquid detergent composition for tableware at 25°C, is preferably 5 mPa·s or more, more preferably 10 mPa·s or more, and preferably 500 mPa·s or less, more preferably 300 mPa·s or less. The viscosity is measured using a B-type viscometer, using the rotor recommended for the viscosity of the measurement object among No. 1 to No. 3 rotors, at 60 r / min, and is the indicated value 1 minute after the start of measurement. If there are multiple rotors that meet the conditions, the value obtained when using the rotor with the smaller number is adopted.

[0080] The liquid detergent composition of the present invention is preferably for hard articles, more preferably for tableware and / or hard articles around the kitchen. The liquid detergent composition of the present invention is more preferably for tableware.

[0081] The hard articles around the kitchen are articles used around the kitchen, specifically, (1) Storage places for food, tableware, and cooking utensils such as refrigerators and cupboards, (2) Cooking places for food such as drain grooves, cooking tables, range hoods, sinks, gas ranges, and microwave ovens, (3) Sponges and brushes used for washing tableware, etc., and (4) Floors and walls around the storage area and cooking area In the present invention, these are referred to as "hard kitchen items" for convenience. In addition, the tableware, specifically, (i) Plates, bowls, and other tableware; (ii) Storage containers such as Tupperware and bottles, (iii) Cooking utensils such as knives, cutting boards, pots, frying pans, and fish grills; (iv) Food processors, mixers, and other cooking appliances In the present invention, these are referred to as "tableware" for convenience. Furthermore, the present invention preferably applies to an item selected from tableware, storage containers, cooking utensils, and cooking appliances, and more preferably applies to an item selected from plates, bowls, Tupperware, bottles, knives, cutting boards, pots, frying pans, fish grills, food processors, and mixers.

[0082] The materials of the hard articles targeted by the present invention include plastics (including silicone resins), metals, ceramics, wood, and combinations thereof. The liquid detergent composition of the present invention can effectively clean greasy stains and sticky stains containing carbohydrates that adhere to these hard articles.

[0083] The liquid detergent composition of the present invention is also suitable for cleaning hard articles made of plastic, such as polyolefins such as polypropylene and polyethylene, polymethacrylate, polycarbonate, ABS resin, and polyethylene terephthalate.

[0084] The liquid detergent composition of the present invention not only has excellent cleaning effects on oily stains and sticky stains containing carbohydrates, but also exhibits high bactericidal and / or antibacterial properties when used as a composition that is brought into direct contact with a target surface, for example, by spraying, applying, or immersing. For example, by using the liquid detergent composition of the present invention to wash objects such as tableware, not only can excellent cleaning effects be obtained but also sterilization and antibacterial properties of the objects to be washed can be achieved. Furthermore, by contacting a cutting board or a sponge with the liquid detergent composition of the present invention, the antibacterial properties of the cutting board or the sponge can be improved.

[0085] Since the liquid detergent composition of the present invention has a high bactericidal effect against Staphylococcus aureus, it can be used to kill, disinfect, or prevent infection against fungi such as those of the genera Escherichia (such as Escherichia coli), Staphylococcus, Methylobacterium, Moraxella, Micrococcus, Pseudomonas, Roseomonas, Sphingomonas, Acetobacter, Bacillus, Aspergillus, Exophiala, Candida, Cladosporium, and Rhodotorula.

[0086] As described above, the liquid detergent composition of the present invention is suitable for use in washing dishes, and also for hand-washing dishes. The cleaning liquid used for hand-washing is obtained using the liquid detergent composition of the present invention, and the undiluted composition or a diluted solution containing water is used. A specific hand-washing method involves, for example, applying the composition of the present invention to a flexible material such as a sponge soaked in water, allowing the cleaning liquid to be held thereon, and then rubbing the material with hands several times to create lather and scrub the dishes. From the viewpoint of high foaming ability and foam persistence, the total concentration of components (a), (b), (c), and (d) in the cleaning liquid held by the flexible material may be, for example, 1,000 ppm or more, or even 2,000 ppm or more, and 30,000 ppm or less, or even 20,000 ppm or less, or even 10,000 ppm or less.

[0087] <How to clean hard surfaces> The present invention provides a method for cleaning a hard surface, which comprises contacting the hard surface with the liquid detergent composition of the present invention. The hard surface may be the surface of a hard article described above for the liquid detergent composition of the present invention, and further may be the surface of tableware and / or hard articles for use in the kitchen. In the method for cleaning a hard surface of the present invention, the components (a) to (d), component (a1), components (a1-1), (a1-2), component (a2), and optional components contained in the liquid detergent composition of the present invention, and the preferred embodiments of the liquid detergent composition are the same as those described for the liquid detergent composition of the present invention. The water used for dilution is not particularly limited, and examples thereof include tap water and groundwater. Specifically, the method for cleaning a hard surface of the present invention includes the method for cleaning dishes described for the liquid detergent composition of the present invention.

Examples

[0088] The liquid detergent compositions in Tables 1 and 2 were prepared using the following components (a) to (f) and the like. Then, the oil and fat detergency, detergency of sticky stains containing carbohydrates, and low-temperature stability of the liquid detergent composition in Table 1 were evaluated. In addition, the bactericidal performance of the liquid detergent composition in Table was evaluated. The results are shown in Tables 1 and 2. Note that the content of each component in Tables 1 and 2 is the amount in terms of pure component. The pH of the composition was measured according to the method described in <Measurement method of pH>. In addition, the "content of component (a1-1) in the composition" in the table was analyzed by the following liquid chromatograph mass spectrometer (LC / MS). The specific measurement conditions are shown below.

[0089] <Measurement method of the content of component (a1-1) in the composition> (1) Analysis method · Gradient high performance liquid chromatograph analysis (HPLC) using a reverse phase ODS semi-micro column filled with a filler in which an octadecylsilyl group (OctaDecylSilyl = ODS group, C18 group) is chemically bonded to a silica gel carrier and a water / methanol / ammonium acetate eluent · Mass spectrometry (MS) by electrospray-ionization method and cation / anion detection (2) Measurement conditions [[ID=​​First, 100 mg of sample (equivalent to 100% actinic acid) was weighed out and adjusted to a volume of 100 mL with methanol to obtain a 1000 mg / L analytical solution. Next, as a pretreatment, ultrasonic dissolution (1 minute) was performed, and insoluble matter was removed by centrifugation (3000 rpm, 10 minutes). The sample after removing insoluble matter by centrifugation was collected and used for LC / MS analysis. (i) HPLC Column: L-column ODS, size: 2.1*150mm Injection volume: 5μL Flow rate: 0.25mL / min Temperature: 40℃ Eluent A: Water (10 mmol / L ammonium acetate) Eluent B: Methanol (10 mmol / L ammonium acetate) Gradient conditions: %B min (%) = 0 (50) 5 (50) 35 (100) 45 (100) 46 (50) 70 (50) (ii) MS (electrospray ionization (ESI)) Detection polarity: Pos / Neg Scan range: m / z=50-1000

[0090] <Component (a)> (1)(a1) component a1-1-i: Sodium lauryl sulfate, manufactured by Kao Corporation a1-2-i: Polyoxypropylene lauryl ether sulfate sodium salt (PO0.6), prepared by adding 0.6 moles of propylene oxide to 1 mole of natural alcohol with an alkyl chain of 12 carbon atoms, then sulfating with sulfur trioxide and neutralizing with sodium hydroxide (neutralizing to a pH of 11 when diluted 10% with water). a1-2-ii: Polyoxyethylene lauryl ether sulfate sodium salt (EO2), prepared by adding 2 moles of ethylene oxide to 1 mole of natural alcohol with an alkyl chain of 12 carbon atoms, then sulfating with sulfur trioxide and neutralizing with sodium hydroxide (neutralizing to a pH of 11 when diluted 10% with water). a1-2-iii: Polyoxypropylene polyoxyethylene lauryl ether sulfate sodium salt (PO0.4EO1.5), prepared by adding 0.4 moles of propylene oxide to 1 mole of natural alcohol with an alkyl chain of 12 carbon atoms, followed by the addition of 1.5 moles of ethylene oxide, sulfating with sulfur trioxide, and neutralizing with sodium hydroxide (neutralizing to a pH of 11 when diluted 10% with water).

[0091] Analysis by the liquid chromatography mass spectrometer (LC / MS) revealed that a1-2-i, a1-2-ii, and a1-2-iii contained 35 mass%, 28 mass%, and 21.5 mass%, respectively, of unreacted sodium lauryl sulfate.

[0092] (2) Anionic surfactants that do not fall under the category of (a1) (2-1)(a2) component a2-i: Sodium di-(2-propylheptyl) sulfosuccinate, manufactured by Kao Corporation a2-ii: Sodium di-(2-ethylhexyl) sulfosuccinate, product name "Airroll CT-1L", manufactured by Toho Chemical Industry Co., Ltd. (2-2) Other anionic surfactants AI: Sodium linear alkylbenzene sulfonate, product name "Neopelex GS", manufactured by Kao Corporation a-ii: Sodium alkanesulfonate, product name "Ramtel PS", manufactured by Kao Corporation

[0093] <(b) Component> b-1: Lauryl dimethyl hydroxysulfobetaine, product name "Amphitol 20HD", manufactured by Kao Corporation b-2: Lauryl dimethylamine oxide, product name "Amphitol 20N", manufactured by Kao Corporation

[0094] <(c) component> c-1: Propylene glycol, manufactured by ADEKA Corporation c-2: Butanediol, manufactured by Tokyo Chemical Industry Co., Ltd. c-3: Hexanediol, manufactured by Tokyo Chemical Industry Co., Ltd. c-4: Decanediol, manufactured by Tokyo Chemical Industry Co., Ltd.

[0095] <(d) component> d-1: p-Toluenesulfonic acid, manufactured by Meiyu Sangyo Co., Ltd. d-2: 4-Cumene sulfonic acid, manufactured by Meiyu Sangyo Co., Ltd. <(e) component> e-1: Polyoxyethylene lauryl ether (EO9), product name "Emulgen 109P", manufactured by Kao Corporation e-2: Alkyl polyglycoside, product name "Plantacare 2000UP", manufactured by BASF Japan e-3: 2-Ethylhexyl monoglyceryl ether, manufactured by Kao Corporation <Component (f)> (f2) component f2-1: Diethylene glycol monobutyl ether, manufactured by Nippon Nyukazai Co., Ltd. f2-2: Phenoxyethanol, manufactured by Nippon Nyukazai Co., Ltd. [Other ingredients] PPG-1000: Polypropylene glycol, average molecular weight 1,000, manufactured by AGC Co., Ltd. Na2SO3: Sodium sulfite, manufactured by Shinshu Chemical Co., Ltd. Fragrance: Kao Corporation Dye: Fujifilm Wako Pure Chemical Industries, Ltd. Citric acid, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. NaOH: Sodium hydroxide, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0096] <Evaluation method> (1) Evaluation method for oil and grease detergency Rapeseed oil and beef tallow were mixed at a 1 / 1 mass ratio, and 0.1 mass% of a dye (Stan Red) was uniformly mixed in. 1 g of model oil stain was spread evenly on a ceramic dish to prepare a model soiled dish. A commercially available sponge (Kikuron A, manufactured by Kikuron Co., Ltd.) was soaked with 1 g of each composition listed in Table 1 and 30 g of tap water, and then rubbed with hands two to three times to create a lather. The sponge was used to scrub the model soiled dishes, and the number of dishes that could be cleaned (determined by the disappearance of the color on the dishes) was counted. The more dishes that could be cleaned, the better the composition's ability to clean grease and grease.

[0097] (2) Evaluation method for cleaning stubborn stains containing carbohydrates A glass slide was coated with meat sauce (600 μm thick) and then dried at 25°C for 24 hours. Each composition in Table 1 was diluted to 3% with 3.5°DH water, and 1.0 g of the diluted solution was impregnated into a piece of sponge (25 mm W × 25 mm D × 10 mm H) and thoroughly lathered. The stained glass slide and sponge were fixed to a Gakushin-type friction fastness tester (Tester Sangyo Co., Ltd., Model No. AB-301) so that the stain was in contact with the aqueous composition on the sponge. The slide and sponge were then scrubbed (stroke length: 30 mm, speed: 40 mm / s, load: 100 g) to determine the number of scrubs required to remove the stain. The fewer scrubs required to remove the stain, the better the composition's ability to clean stubborn stains.

[0098] (3) Evaluation method for low-temperature stability 100 mL of each composition in Table 1 was placed in a PP container (Good Boy, manufactured by AS ONE Corporation) and stored at -5°C or 0°C for 3 days. The changes in the appearance of the composition at each test temperature were visually observed and compared with those immediately after preparation and evaluated according to the following criteria. Compositions rated "1" or "2" in low-temperature stability have excellent low-temperature stability, and compositions rated "1" have even better low-temperature stability. [Evaluation criteria] 1: No change in appearance was observed at -5°C and 0°C. 2: At -5°C, changes in appearance such as gelation, separation, and precipitation were observed, but no changes in appearance were observed at 0°C. 3: At -5°C and 0°C, changes in appearance such as gelation, separation, and precipitate formation were observed.

[0099] (4) Evaluation method for antibacterial effect The antibacterial effect of each composition listed in Table 2 was evaluated with reference to the "Test method for disinfecting activity of kitchen synthetic detergents and soaps on sponges" of the Japan Soap and Detergent Industry Association.

[0100] First, Staphylococcus aureus was cultured on an agar plate at 37±1°C for 16 to 24 hours, and the bacterial concentration was 3.5×10 in 0.3% nutrient medium and 3°DH hard water. 7 ~3.5×10 8 The concentration was adjusted to cfu / mL. Next, a 110 mL screw-cap bottle containing 2.4 cm diameter and 3 cm height A cylindrical dish sponge was inoculated with 0.5 mL of the above bacterial solution and rubbed evenly with a sterilized glass rod. The bottle was sealed and left to sit at 25°C for 1 hour, after which 0.5 mL of the liquid detergent composition shown in Table 2 was inoculated into the sponge. Next, the sponge was rubbed evenly with a new sterilized glass rod, resealed, and left to stand at 25°C for 18 hours.

[0101] After leaving the mixture, 20 mL of neutralizing agent was added to the screw-cap bottle, and the sponge was rubbed evenly with a sterilized glass rod. A dilution series was prepared using this solution, and the number of colonies was measured using the plate smear method. The antibacterial effect was evaluated according to the following criteria using the value obtained by subtracting the logarithm of the number of bacteria after the test from the logarithm of the initial number of bacteria. The compositions of the examples in Table 2 were rated as "Good" in antibacterial effect. A liquid detergent composition rated as "Good" in antibacterial effect can be said to have a high antibacterial effect. Furthermore, a high antibacterial effect means that the liquid detergent composition has a high disinfecting effect when used. [Evaluation criteria] 〇(Good): Antibacterial activity value of 2 or more. × (NG): Antibacterial activity value less than 2.

[0102] The liquid detergent compositions in Table 2 were found to have excellent grease cleaning properties as evaluated by the above (1) method for evaluating grease cleaning properties, excellent grease cleaning properties as evaluated by the above (2) method for evaluating stubborn dirt containing carbohydrates, and excellent low-temperature stability as evaluated by the above (3) method for evaluating low-temperature stability.

[0103] [Table 1]

[0104] [Table 2]

[0105] *1: The numbers in parentheses in the a1-1-i column in Tables 1 and 2 indicate the amount of sodium lauryl sulfate contained in components (a1-2-i) to (a1-2-iii) converted into the content in the liquid detergent composition.

Claims

1. (a) an anionic surfactant (hereinafter referred to as component (a)) in an amount of 5% by mass or more and 20% by mass or less; (b) an amphoteric or semi-polar surfactant (hereinafter referred to as component (b)) in an amount of 5% by mass or more and 25% by mass or less; (c) a diol compound (hereinafter referred to as component (c)) in an amount of 0.1% by mass or more and 8% by mass or less; (d) an aromatic sulfonic acid or a salt thereof having a total carbon number of 9 or less (hereinafter referred to as component (d)); and water, wherein the total content of all surfactants contained in the composition is 30 mass% or less, the mass ratio of the content of component (a) to the content of component (b) [(a) / (b)] is 0.8 or more and 3.5 or less, component (a) contains an alkyl sulfate ester type surfactant [hereinafter referred to as component (a1)], component (a1) has one or more oxyalkylene groups selected from oxyethylene groups and oxypropylene groups, and the average number of moles of oxyethylene groups added is 2.5 or less and the average number of moles of oxypropylene groups added is 1.0 or less.

2. The component (a) includes (a1-1) an alkyl sulfate ester or a salt thereof having an alkyl group having from 8 to 16 carbon atoms and no oxyalkylene group (hereinafter referred to as component (a1-1)), 2. The liquid detergent composition according to claim 1, wherein the content of component (a1-1) in the composition is 1.0 mass% or more.

3. 2. The liquid detergent composition according to claim 1, wherein the component (a) contains the component (a1) in an amount of 50% by mass or more in the component (a).

4. 2. The liquid detergent composition according to claim 1, wherein the mass ratio [(a) / (c)] of the content of the component (a) to the content of the component (c) is 1.0 or more and 100 or less.

5. 2. The liquid detergent composition according to claim 1, wherein the mass ratio of the content of the component (d) to the content of the component (b) [(d) / (b)] is 0.3 or more and 5 or less.

6. 2. The liquid detergent composition according to claim 1, further comprising (e) one or more nonionic surfactants selected from alkyl monoglyceryl ethers and alkyl polyglycosides.

7. 2. The liquid detergent composition according to claim 1, further comprising (f2) a glycol ether-based water-soluble organic solvent (hereinafter referred to as component (f2)), and the mass ratio [(f2) / (c)] of the content of component (f2) to the content of component (c) is 0.1 or more and 5 or less.

8. The liquid detergent composition according to claim 1, which is for use on tableware and / or hard items around the kitchen.

9. A method for cleaning a hard surface, comprising contacting the hard surface with the liquid detergent composition according to any one of claims 1 to 8.

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