Liquid detergent for clothing

Abstract

To provide a liquid detergent for clothing capable of exhibiting moderate foaming during washing and enabling rapid foam disappearance after agitation is stopped.SOLUTION: A liquid detergent for clothing comprises the following Components (a), (b), (c), and water: Component (a): at least one surfactant selected from an anionic surfactant having a sulfonate group, an anionic surfactant having a sulfate ester group, and a nonionic surfactant, Component (b): a fatty acid having 10 to 18 carbon atoms or a salt thereof, in which the content ratio of a fatty acid having 12 carbon atoms is 32 mass% or more and 97 mass% or less, and Component (c): two or more compounds selected from the following components (c1) and (c2), the component (c) including both component (c1) and component (c2), where Component (c1) is a quaternary ammonium salt having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms and Component (c2) is a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent for clothing, a method for defoaming the liquid detergent for clothing, and the use of a quaternary ammonium salt and a tertiary amine or a salt thereof to enhance the defoaming action of a fatty acid or a salt thereof. [Background technology]

[0002] Conventionally, anionic surfactants, such as alkylbenzene sulfonates and olefin sulfonates (e.g., internal olefin sulfonates obtained from an internal olefin having a double bond internally rather than at the end of the olefin chain), and nonionic surfactants, such as nonionic surfactants containing an oxyalkylene group having 2 to 3 carbon atoms, have been widely used as cleaning ingredients for household and industrial use. Fatty acids are also widely used as antifoaming agents in laundry detergents. Furthermore, quaternary ammonium compounds having an aliphatic alkyl group are used as antibacterial agents. Fatty acids or their salts are used in liquid laundry detergents as agents for adjusting foaming during washing or rinsing.

[0003] Patent Document 1 describes a liquid detergent composition containing a cationic antibacterial agent and a polycarboxylate polymer having a specific molecular weight, which exhibits excellent bactericidal properties, soil redeposition prevention, and liquid stability. Patent Document 2 describes a liquid detergent composition containing a cationic antibacterial agent, a specific anionic surfactant, an amphoteric surfactant, and a nonionic surfactant, which exhibits excellent bactericidal properties, soil redeposition prevention, and liquid stability. Patent Document 3 describes a liquid detergent composition for clothing that exhibits excellent antibacterial properties and appearance, which contains an anionic surfactant with a specific structure, a nonionic surfactant, a quaternary ammonium compound having a hydrocarbon group of a specific chain length, a carboxylic acid having 4 to 12 carbon atoms and having a carboxylic acid of 2 to 4 valences or a salt thereof, and an organic solvent having one or more hydroxyl groups. Both patent documents also describe the inclusion of a fatty acid as an optional ingredient. Patent Document 4 discloses a liquid detergent for clothing that exhibits excellent freeze recovery, which contains an internal olefin sulfonate of a specific chain length, a nonionic surfactant, a specific anionic surfactant, a fatty acid of a specific chain length or a salt thereof, an organic solvent having a hydroxyl group, and water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-152199 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-152200 [Patent Document 3] Japanese Patent Application Publication No. 2017-25208 [Patent Document 4] Japanese Patent Publication No. 2020-109145 Summary of the Invention [Problem to be solved by the invention]

[0005] The cleaning solution obtained by mixing a liquid laundry detergent with water is required to foam appropriately when subjected to mechanical forces such as agitation during the washing process in a washing machine, making it easier to remove dirt from clothing. However, if the foam becomes too stable, it can persist during the rinsing process following the washing process, increasing the amount of water used for rinsing. Fatty acids are known to be used to suppress foaming during rinsing. However, it has been revealed that when mechanical forces such as agitation are applied to the cleaning solution during the washing process, not just during rinsing, even if a moderate amount of foam is generated, it is required that the foam disappear quickly, within a short period of approximately two minutes after agitation stops. While commonly used laundry detergents containing fatty acids can suppress foaming during rinsing, it is necessary to quickly eliminate foam generated in low-temperature cleaning solutions with high surfactant concentrations.

[0006] The present invention provides a liquid laundry detergent that, in a low-temperature washing solution of about 5°C obtained by adding the liquid laundry detergent to water, produces moderate foam during washing with mechanical force such as stirring, but the foam quickly disappears when stirring is stopped, and a method for defoaming the liquid laundry detergent.The present invention also provides the use of a specific quaternary ammonium compound and a tertiary amine or a salt thereof to enhance the defoaming action of a fatty acid or a salt thereof in the liquid laundry detergent. [Means for solving the problem]

[0007] The present invention relates to a liquid detergent for clothing, which contains the following components (a), (b), and (c), and water: Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants (b) Component: a fatty acid having 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is 32% by mass to 97% by mass, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): A quaternary ammonium salt having two aliphatic hydrocarbon groups with 6 to 8 carbon atoms. Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

[0008] The present invention also relates to the use of the following component (c) in a liquid laundry detergent containing the following components (a), (b), and (c) and water, for enhancing the defoaming action of component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants (b) Component: a fatty acid having 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is 32% by mass to 97% by mass, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): A quaternary ammonium salt having two aliphatic hydrocarbon groups with 6 to 8 carbon atoms. Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

[0009] The present invention also relates to a method for defoaming a liquid detergent for clothing, which comprises blending a defoaming component (c) with a liquid detergent for clothing containing the following components (a) and (b), thereby enhancing the defoaming action of component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants (b) Component: a fatty acid having 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is 32% by mass to 97% by mass, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): A quaternary ammonium salt having two aliphatic hydrocarbon groups with 6 to 8 carbon atoms. Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms [Effects of the Invention]

[0010] The present invention provides a liquid laundry detergent that, when mixed with water and subjected to mechanical force such as stirring, produces a moderate amount of foam during washing at a low temperature of about 5°C, but the foam quickly disappears when stirring is stopped, and a method for defoaming the liquid laundry detergent.The present invention also provides the use of a specific quaternary ammonium compound and a tertiary amine or a salt thereof in the liquid laundry detergent to enhance the defoaming action of a fatty acid or a salt thereof. DETAILED DESCRIPTION OF THE INVENTION

[0011] The liquid laundry detergent of the present invention contains one or more surfactants selected from specific anionic surfactants and nonionic surfactants, a fatty acid or its salt of a specific chain length, and water, and further contains two or more compounds including a quaternary ammonium salt having two aliphatic hydrocarbon groups of a specific carbon chain length and a tertiary amine or its salt.It has been found that by adding the liquid laundry detergent to water, the low-temperature cleaning solution at about 5°C produces a moderate amount of foam during washing when mechanical force such as stirring is applied, but the foam quickly disappears when stirring is stopped.

[0012] Specifically, in a liquid laundry detergent containing one or more surfactants selected from (a1) anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants, a fatty acid or a salt thereof having an anti-foaming effect, in which the content of fatty acids having 12 carbon atoms in the fatty acids having 10 to 18 carbon atoms is 32% by mass to 97% by mass, and water, the detergent unexpectedly has the effect of maintaining foaming during stirring while further enhancing the anti-foaming effect of the fatty acid or its salt when stirring is stopped by further using two or more compounds including a quaternary ammonium salt having two aliphatic hydrocarbon groups having 6 to 8 carbon atoms and a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups having 6 to 8 carbon atoms in the fatty acid or its salt. In this specification, the effect of quickly eliminating foam when stirring is stopped during cleaning may be referred to as the "defoaming effect."

[0013] <Component (a)> Component (a) is one or more surfactants selected from (a1) anionic surfactants having sulfonate groups, (a2) anionic surfactants having sulfate ester groups, and (a3) ​​nonionic surfactants. Component (a) has the function of cleaning stains attached to clothing and also has the function of generating foam in a cleaning solution containing component (a) and water. Hereinafter, in this invention, the anionic surfactant having sulfonate groups may be referred to as component (a1), the anionic surfactant having sulfate ester groups as component (a2), and the nonionic surfactant as component (a3).

[0014] <Component (a1)> Component (a1) is an anionic surfactant having a sulfonate group. From the viewpoint of facilitating the generation of an appropriate amount of foam during agitation of the cleaning solution, component (a1) is preferably a sulfonic acid or a salt thereof having a hydrocarbon group having from 10 to 22 carbon atoms. More specific examples of component (a1) include alkylbenzenesulfonates in which the alkyl group has from 10 to 16 carbon atoms, alkenylbenzenesulfonates in which the alkenyl group has from 10 to 16 carbon atoms, alkanesulfonates in which the alkyl group has from 10 to 16 carbon atoms, α-olefinsulfonates in which the α-olefin moiety has from 10 to 14 carbon atoms, α-sulfofatty acid salts in which the fatty acid moiety has from 10 to 18 carbon atoms, α-sulfofatty acid lower alkyl ester salts in which the fatty acid moiety has from 10 to 18 carbon atoms and the ester moiety has from 1 to 5 carbon atoms, and internal olefinsulfonates in which the carbon atoms are from 16 to 18.

[0015] Internal olefin sulfonates having 16 to 18 carbon atoms can be obtained by sulfonating internal olefins having 16 to 18 carbon atoms. The term "internal olefin" refers to an olefin in which the double bond is located inside the 2-position. Internal olefins can be obtained, for example, by isomerizing 1-olefins obtained by dehydrating 1-alcohols. Sulfonation of internal olefins quantitatively produces β-sultone, and some of the β-sultone is converted to γ-sultone and olefin sulfonic acid. These are then converted to hydroxyalkanesulfonates and olefin sulfonates in the neutralization and hydrolysis process (e.g., J. Am. Oil Chem. Soc. 69, 39 (1992)). The hydroxy group of the resulting hydroxyalkanesulfonate is located inside the alkane chain, while the double bond of the olefin sulfonate is located inside the olefin chain. The resulting product is primarily a mixture of these compounds, and may contain trace amounts of hydroxyalkanesulfonates having a hydroxy group at the end of the carbon chain or α-olefinsulfonates having a double bond at the end of the carbon chain. In this specification, these products and their mixtures are collectively referred to as internal olefinsulfonates. Hydroxyalkanesulfonates are referred to as hydroxy forms of internal olefinsulfonates (hereinafter also referred to as HAS), and olefinsulfonates are referred to as olefin forms of internal olefinsulfonates (hereinafter also referred to as IOS). The internal olefin sulfonate of the component (a1) is preferably an internal olefin sulfonate having 16 or 18 carbon atoms.

[0016] Examples of salts of component (a1) include alkali metal salts, alkaline earth metal (half atom) salts, ammonium salts, and organic ammonium salts. Examples of alkali metal salts include sodium salts and potassium salts. Examples of organic ammonium salts include alkanolammonium salts having 1 to 6 carbon atoms, such as monoethanolammonium salts. In the present invention, when the mass of component (a1) is used, the mass is converted into that of the sodium salt.

[0017] <(a2) component> Component (a2) is an anionic surfactant having a sulfate salt group. From the viewpoint of facilitating the generation of an appropriate amount of foam during stirring of the cleaning solution, component (a2) is preferably a sulfate salt having an aliphatic hydrocarbon group having from 10 to 16 carbon atoms. Examples of sulfate salts having an aliphatic hydrocarbon group having from 10 to 16 carbon atoms include one or more anionic surfactants selected from alkyl sulfate salts having an aliphatic alkyl group with from 10 to 16 carbon atoms, alkenyl sulfate salts having an aliphatic alkenyl group with from 10 to 16 carbon atoms, polyoxyalkylene alkyl ether sulfate salts having an aliphatic alkyl group with from 10 to 16 carbon atoms and an average number of added moles of oxyalkylene groups having 2 or 3 carbon atoms of from 0.5 to 5, and polyoxyalkylene alkenyl ether sulfate salts having an aliphatic alkenyl group with from 10 to 16 carbon atoms and an average number of added moles of oxyalkylene groups having 2 or 3 carbon atoms of from 0.5 to 5.

[0018] From the viewpoint of further enhancing the defoaming effect after stirring in the washing step is stopped, the number of carbon atoms in the aliphatic alkyl group or aliphatic alkenyl group of component (a2) is preferably 12 or more, and from the same viewpoint, it is preferably 16 or less. Examples of the oxyalkylene group of component (a2) include one or more groups selected from an oxyethylene group and an oxypropylene group. When the oxyalkylene group is an oxypropylene group, the average number of moles of oxypropylene group added is preferably 0.5 or more, more preferably 0.6 or more, even more preferably 1.0 or more, from the viewpoint of further enhancing the defoaming effect, and from the same viewpoint, it is preferably 4 or less, more preferably 3 or less, even more preferably 2.5 or less. When the oxyalkylene group is an oxyalkylene group consisting of an oxypropylene group and an oxyethylene group, from the viewpoint of further enhancing the defoaming effect, the average number of moles of oxyalkylene groups added is 0.5 moles or more and 5 moles or less, and the ratio of the average number of moles of oxypropylene groups to the average number of moles of oxyethylene groups, that is, the average number of moles of oxypropylene groups / the average number of moles of oxyethylene groups added, is preferably 0.1 or more, more preferably 0.2 or more, even more preferably 0.3 or more, still more preferably 0.5 or more, and from the same viewpoint, it is preferably 5 or less, more preferably 3 or less, even more preferably 2 or less. When the oxyalkylene group is an oxyethylene group, the average number of moles of oxyethylene groups added is, from the viewpoint of further enhancing the defoaming effect, preferably 0.5 or more, more preferably 0.6 or more, even more preferably 0.8 or more, and still more preferably 1.0 or more, and from the same viewpoint, preferably 5.0 or less, more preferably 4.5 or less, even more preferably 4.0 or less, still more preferably 3.5 or less, and still more preferably 3.0 or less. (a2) When using the mass of a component, use the mass converted into the sodium salt.

[0019] <(a3) component> Component (a3) ​​is a nonionic surfactant. Component (a3) ​​has the effect of cleaning stains attached to clothing. Suitable nonionic surfactants are one or more selected from the group consisting of nonionic surfactants represented by general formula (a3-1) and amine oxides having one aliphatic hydrocarbon group having from 8 to 16 carbon atoms. R 1a (CO) m O-(A 1 O) n -R 2a (a3-1) [In the formula, R 1a is an aliphatic hydrocarbon group having 9 to 18 carbon atoms, and R 2a is a hydrogen atom or a methyl group, CO is a carbonyl group, m is the number 0 or 1, and A 1The O group is one or more groups selected from an ethyleneoxy group and a propyleneoxy group, and n is the average number of moles added, and is a number of 5 to 40.

[0020] In general formula (a3-1), R 1a is an aliphatic hydrocarbon group having 9 to 18 carbon atoms. 1a From the viewpoint of further enhancing the effects of the present invention, the number of carbon atoms in R is preferably 12 or more, more preferably 12.5 or more, and even more preferably 13.0 or more, and from the same viewpoint, it is preferably 16 or less, and more preferably 15 or less. 1a The aliphatic hydrocarbon group in R is preferably a group selected from an aliphatic alkyl group and an aliphatic alkenyl group. 1a In order to further enhance the effects of the present invention, the nonionic surfactant represented by general formula (a3-1) may have an average carbon number of R 1a A nonionic surfactant containing a plurality of compounds having different carbon numbers is preferred.

[0021] In general formula (a3-1), m is a number of 0 or 1. From the viewpoint of further enhancing the defoaming effect of the present invention, m is preferably 0.

[0022] In general formula (a3-1), A 1 The O group is one or more groups selected from an ethyleneoxy group and a propyleneoxy group. 1 When the O group contains an ethyleneoxy group and a propyleneoxy group, the ethyleneoxy group and the propyleneoxy group may be bonded in a block or random manner. 1 The O group is preferably a group containing an ethyleneoxy group, from the viewpoint of obtaining higher foaming during stirring in the washing step. 1 From the viewpoint of further enhancing the defoaming effect after stirring is stopped in the washing step, the O group is preferably an alkyleneoxy group containing a propyleneoxy group, more preferably an alkyleneoxy group containing an ethyleneoxy group and a propyleneoxy group, and even more preferably an oxyalkylene group consisting of an ethyleneoxy group and a propyleneoxy group.

[0023] In general formula (a3-1), n ​​is the average number of moles added, and from the viewpoint of obtaining higher foaming upon stirring in the washing step, n is preferably a number of 5 or more and 40 or less. From the viewpoint of obtaining higher foaming upon stirring in the washing step, n is preferably a number of 6 or more, more preferably 7 or more, even more preferably 8 or more, still more preferably 9 or more, still more preferably 10 or more, and from the same viewpoint, n is preferably 35 or less, more preferably 26 or less, still more preferably 24 or less, and still more preferably 22 or less. In general formula (a3-1), A 1 When the O group is a group consisting of a propyleneoxy group and an ethyleneoxy group, the ratio of the average number of moles of propyleneoxy groups to the average number of moles of ethyleneoxy groups, i.e., the average number of moles of propyleneoxy groups added / the average number of moles of ethyleneoxy groups added, is preferably 0.05 or more, more preferably 0.07 or more, and even more preferably 0.1 or more, from the viewpoint of further enhancing the defoaming effect, and from the same viewpoint, it is preferably 1 or less, more preferably 0.7 or more, and even more preferably 0.5 or less. In general formula (a3-1), R 2a is preferably a hydrogen atom.

[0024] As the amine oxide having one aliphatic hydrocarbon group having from 8 to 16 carbon atoms as component (a3), from the viewpoint of further enhancing the defoaming effect, an amine oxide having one aliphatic alkyl group having from 8 to 16 carbon atoms and two or more groups selected from an alkyl group having from 1 to 3 carbon atoms, a hydroxyethyl group, and a hydroxypropyl group is preferred. Examples of the alkyl group having from 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. From the viewpoint of further enhancing the defoaming effect, the number of carbon atoms in the aliphatic hydrocarbon group is preferably 10 or more, more preferably 12 or more, and preferably 14 or less.

[0025] From the viewpoint of further enhancing the defoaming effect, the component (a) contains two or more surfactants selected from the component (a1), the component (a2), and the component (a3), and further, it is preferable that the surfactants contain surfactants belonging to different groups among the group of compounds corresponding to the component (a1), the group of compounds corresponding to the component (a2), and the group of compounds corresponding to the component (a3). For example, from the viewpoint of further enhancing the defoaming effect, the component (a) is preferably a surfactant containing the components (a1) and (a2). Furthermore, from the viewpoint of further enhancing the defoaming effect, the component (a) more preferably contains an anionic surfactant and a nonionic surfactant, and even more preferably contains one or more anionic surfactants selected from the components (a1) and (a2) and one or more nonionic surfactants selected from the component (a3).

[0026] <(b) Component> Component (b) is a fatty acid having from 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is from 32% by mass to 97% by mass, or a salt thereof. Component (b) is used to increase foaming of the cleaning solution containing the detergent during agitation in a washing process using a liquid laundry detergent, and to eliminate foam when agitation is stopped, and the content and distribution of the C12 fatty acid and / or its salt are controlled to further enhance the defoaming effect of component (c). More specifically, from the viewpoint of further enhancing the defoaming effect of component (c), it is preferred that two or more fatty acids or salts thereof are used as the C10 to C18 fatty acid of component (b), and that the content of the C12 fatty acid in component (b) is 32% by mass to 97% by mass. From the viewpoint of further enhancing the defoaming effect, the content of fatty acids having 12 carbon atoms in component (b) is preferably 35% by mass or more, more preferably 40% by mass or more, even more preferably 45% by mass or more, still more preferably 50% by mass or more, still more preferably 55% by mass or more, still more preferably 60% by mass or more, still more preferably 65% ​​by mass or more, still more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more, and preferably 96% by mass or less. The content of fatty acids having 12 carbon atoms in the fatty acids having 10 to 18 carbon atoms, which are component (b), can be calculated by the following method.

[0027] <Calculation method for fatty acid composition> 1 g of fatty acid was placed in a ground-in flask (50 mL, Pyrex), 0.7 mL of 0.5 N potassium hydroxide / methanol solution was added, and the mixture was incubated in an 80°C oil bath for 30 minutes. Subsequently, 1 mL of 14% boron trifluoride solution (Sigma) was added, and the mixture was incubated in an 80°C oil bath for 10 minutes. Subsequently, 1 mL each of hexane and saturated saline was added, and the mixture was stirred vigorously. After leaving the mixture at room temperature for 30 minutes, the upper hexane layer was collected to obtain fatty acid methyl esters. The obtained fatty acid methyl esters were subjected to gas chromatography analysis to analyze their fatty acid composition. Gas chromatography analysis was performed under the following conditions. The content (mass%) of the peak area of ​​fatty acid methyl esters with a carbon chain length of 12 was calculated as the ratio of the total area of ​​peaks corresponding to fatty acid methyl esters with a carbon number of 10 to 18, taken as 100, based on the peak area obtained by gas chromatography analysis.

[0028] <Gas chromatography analysis conditions> Capillary column: DB-1 MS 20 m × 100 μm × 0.10 μm (J&W Scientific), Mobile phase: High purity helium, Intra-column flow rate: 0.3 mL / min Temperature program: 150°C (0.5 min) → 20°C / min → 320°C (2 min), Equilibration time: 1 minute Inlet: Split injection (split ratio: 75:1), Pressure: 62.4 psi, 24.5 mL / min Injection volume: 5μL, Washing vials: methanol and chloroform, Detector temperature: 300℃

[0029] From the viewpoint of further enhancing the defoaming effect, component (b) is preferably a fatty acid containing a 12-carbon fatty acid, a 14-carbon fatty acid, or a 16-carbon fatty acid, or a salt thereof. Specific examples of fatty acids having 10 to 18 carbon atoms include decanoic acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, and salts thereof. Examples of fatty acid salts include inorganic salts selected from sodium salts, potassium salts, magnesium salts, and ammonium salts, and organic amine salts such as monoethanolamine salts, diethanolamine salts, and triethanolamine salts. Preferred examples include sodium salts, potassium salts, and magnesium salts, and more preferably sodium salts and potassium salts. In the present invention, the mass of component (b) refers to the mass of the acid form of the fatty acid, unless otherwise specified.

[0030] <(c) component> Component (c) is selected from the following components (c1) and (c2), and is two or more compounds containing components (c1) and (c2). In the present invention, when used with component (b), component (c) has the effect of enhancing the defoaming action of component (b) after stirring in the washing step has stopped. Also, in the present invention, component (c) is used to enhance the defoaming action of component (b) in a liquid laundry detergent containing components (a), (b), and water.

[0031] The component (c1) is a quaternary ammonium salt having two aliphatic hydrocarbon groups each having a carbon number of 6 to 8. Examples of the component (c1) include compounds represented by the following general formula (c1-1).

[0032] [ka]

[0033] [In the formula, R 11c , R 12c are the same or different and are aliphatic hydrocarbon groups having 6 to 8 carbon atoms, and R 13c , R 14care groups selected from alkyl groups having 1 to 3 carbon atoms and hydroxyalkyl groups having 1 to 3 carbon atoms, and X - is an anion selected from a halide ion and an alkyl sulfate ion having 1 to 3 carbon atoms.

[0034] In the general formula (c1-1) of the component (c1), R 11c , R 12c are the same or different and are aliphatic hydrocarbon groups having 6 to 8 carbon atoms, and from the viewpoint of further enhancing the defoaming effect, are preferably aliphatic hydrocarbon groups having 7 to 8 carbon atoms, and more preferably an aliphatic hydrocarbon group having 8 carbon atoms. 11c , R 12c From the viewpoint of further enhancing the defoaming effect, R are preferably the same aliphatic hydrocarbon group. 11c , R 12c The aliphatic hydrocarbon group R may be a linear or branched alkyl group, and from the viewpoint of further enhancing the defoaming effect, a linear alkyl group is preferred. 11c , R 12c Specific examples of the aliphatic hydrocarbon group include a hexyl group, a heptyl group, and an octyl group.

[0035] In general formula (c1-1), R 13c , R 14c are each independently a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms. Specific examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Specific examples of the hydroxyalkyl group having 1 to 3 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, and a hydroxypropyl group.

[0036] In general formula (c1-1), X -is an anion selected from a halide ion and an alkyl sulfate ion having 1 to 3 carbon atoms. Specific examples of the halide ion include chloride ion and bromide ion, with chloride ion being preferred from the viewpoint of further enhancing the defoaming effect. Specific examples of the alkyl sulfate ion having 1 to 3 carbon atoms include methyl sulfate ion, ethyl sulfate ion, and propyl sulfate ion, with methyl sulfate ion and ethyl sulfate ion being preferred from the viewpoint of further enhancing the defoaming effect.

[0037] More preferred specific examples of component (c1) include one or more compounds selected from N,N-dihexyl-N,N-dimethylammonium salt, N,N-diheptyl-N,N-dimethylammonium salt, N,N-dioctyl-N,N-dimethylammonium salt, N,N-dihexyl-N-methyl-N-ethylammonium salt, N,N-diheptyl-N-methyl-N-ethylammonium salt, N,N-dioctyl-N-methyl-N-ethylammonium salt, N-octyl-N-hexyl-N,N-dimethylammonium salt, N-octyl-N-hexyl-N-methyl-N-ethylammonium salt, N,N-dihexyl-N-methyl-N-hydroxyethylammonium salt, N,N-diheptyl-N-methyl-N-hydroxyethylammonium salt, and N,N-dioctyl-N-methyl-N-hydroxyethylammonium salt. These salts are preferably chlorides, methyl sulfates, or ethyl sulfates. In the present invention, the mass of the component (c1) is the mass converted into chloride.

[0038] The component (c2) is a tertiary amine having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms, or a salt thereof. Examples of the component (c2) include a compound represented by the following general formula (c2-1) or a salt thereof.

[0039] [ka]

[0040] [In the formula, R 21c , R 22care aliphatic hydrocarbon groups having 6 to 8 carbon atoms, and R 23c is a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms.

[0041] In general formula (c2-1), R 21c , R 22c are the same or different and are aliphatic hydrocarbon groups having 6 to 8 carbon atoms, and from the viewpoint of further enhancing the defoaming effect, are preferably aliphatic hydrocarbon groups having 7 to 8 carbon atoms, and more preferably an aliphatic hydrocarbon group having 8 carbon atoms. 21c , R 22c From the viewpoint of further enhancing the defoaming effect, R are preferably the same aliphatic hydrocarbon group. 21c , R 22c The aliphatic hydrocarbon group R may be a linear or branched alkyl group, and from the viewpoint of further enhancing the defoaming effect, a linear alkyl group is preferred. 21c , R 22c Specific examples of the aliphatic hydrocarbon group include a hexyl group, a heptyl group, and an octyl group.

[0042] In general formula (c2-1), R 23c is a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms. Specific examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Specific examples of the hydroxyalkyl group having 1 to 3 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, and a hydroxypropyl group.

[0043] Examples of the salt of the component of general formula (c2-1) include inorganic salts and organic salts having from 1 to 3 carbon atoms. Examples of inorganic salts include hydrochlorides and sulfates. Examples of organic salts having from 1 to 3 carbon atoms include alkyl sulfates having from 1 to 3 carbon atoms. Specific examples of alkyl sulfates having from 1 to 3 carbon atoms include methyl sulfate, ethyl sulfate, and propyl sulfate.

[0044] More preferred specific amine compounds for component (c2) include one or more compounds selected from N,N-dihexyl-N-methylamine, N,N-diheptyl-N-methylamine, N,N-dioctyl-N-methylamine, N,N-dihexyl-N-ethylamine, N,N-diheptyl-N-ethylamine, N,N-dioctyl-N-ethylamine, N,N-dihexyl-N-(2-hydroxyethyl)amine, N,N-diheptyl-N-(2-hydroxyethyl)amine, and N,N-dioctyl-N-(2-hydroxyethyl)amine. Preferred salts of these compounds are hydrochlorides, methyl sulfates, or ethyl sulfates. In the present invention, the mass of component (c2) refers to the mass of the amine.

[0045] <Water> The liquid detergent for clothing of the present invention contains water. The water can be ion-exchanged water or water to which sodium hypochlorite has been added in an amount of 1 mg / kg to 5 mg / kg relative to the ion-exchanged water. Tap water can also be used.

[0046] <Composition of liquid laundry detergent> The content of component (a) in the liquid detergent for clothing of the present invention is preferably 10% by mass or more, more preferably 12% by mass or more, and even more preferably 14% by mass or more, from the viewpoint of cleaning ability for stains attached to clothing or from the viewpoint of foaming appropriately during the cleaning process, and from the viewpoint of further enhancing the defoaming effect, it is preferably 70% by mass or less, more preferably 65% ​​by mass or less, even more preferably 60% by mass or less, even more preferably 55% by mass or less, and even more preferably 50% by mass or less.

[0047] From the viewpoint of further enhancing the defoaming effect, it is preferable to use component (a1) and component (a2) in combination. When the liquid detergent for clothing of the present invention contains component (a1) and component (a2), the mass ratio of the content of component (a2) to the content of component (a1) contained in the detergent, component (a2) / component (a1), is preferably 0.05 or more, more preferably 0.1 or more, even more preferably 0.2 or more, and from the same viewpoint, it is preferably 0.9 or less, more preferably 0.8 or less, even more preferably 0.7 or less, still more preferably 0.6 or less, and even more preferably 0.5 or less.

[0048] From the viewpoint of further enhancing the defoaming effect, component (a) preferably contains two or more surfactants, more preferably contains an anionic surfactant and a nonionic surfactant, and even more preferably contains one or more anionic surfactants selected from components (a1) and (a2) and one or more nonionic surfactants selected from component (a3). In the case where component (a) contained in a liquid laundry detergent contains components (a1) and / or (a2) and also contains component (a3), the mass ratio of the content of component (a3) ​​to the total content of components (a1) and (a2), i.e., component (a3) / [component (a1)+component (a2)], is preferably 0.5 or more, more preferably 0.7 or more, even more preferably 1 or more, still more preferably 2 or more, and from the same viewpoint, is preferably 7 or less, more preferably 5 or less, even more preferably 4 or less. The total content of the components (a1) and (a2) may include either the component (a1) or the component (a2).

[0049] The content of component (b) in the liquid laundry detergent of the present invention is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of good foaming during stirring in the washing process and enhancing the defoaming effect when stirring is stopped in the washing process, and is preferably 18% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, and even more preferably 7% by mass or less, from the viewpoint of good foaming during stirring in the washing process.

[0050] The content of component (c) in the liquid laundry detergent of the present invention is preferably 0.1 parts by mass or more, more preferably 0.7 parts by mass or more, even more preferably 0.8 parts by mass or more, still more preferably 0.9 parts by mass or more, still more preferably 1 part by mass or more, still more preferably 1.25 parts by mass or more, still more preferably 1.5 parts by mass or more, still more preferably 2 parts by mass or more, still more preferably 3 parts by mass or more, still more preferably 4 parts by mass or more, and from the same viewpoint, is preferably 10 parts by mass or less, more preferably 9 parts by mass or less, per 1 part by mass of component (b), from the viewpoint of providing good foaming during stirring in the washing process and enhancing the defoaming effect when stirring is stopped in the washing process.

[0051] The content of component (c) in the liquid laundry detergent of the present invention is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 3% by mass or more, even more preferably 4% by mass or more, even more preferably 5% by mass or more, even more preferably 6% by mass or more, from the viewpoint of providing good foaming during stirring in the washing process and enhancing the defoaming effect when stirring is stopped in the washing process, and from the same viewpoint, is preferably 14% by mass or less, more preferably 12% by mass or less, even more preferably 10% by mass or less, even more preferably 8% by mass or less, and even more preferably 6% by mass or less.

[0052] With regard to the component (c), from the viewpoint of further enhancing the defoaming effect after stirring is stopped in the washing step, the mass of the component (c2) per 1 part by mass of the component (c1) is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, even more preferably 0.05 parts by mass or more, still more preferably 0.1 parts by mass or more, still more preferably 0.2 parts by mass or more, still more preferably 0.4 parts by mass or more, and from the same viewpoint, it is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, even more preferably 2 parts by mass or less, and still more preferably 1 part by mass or less.

[0053] <Clothing> In the present invention, the term "clothing" is not particularly limited, but examples thereof include undershirts, T-shirts, dress shirts, blouses, slacks, hats, handkerchiefs, towels, knitwear, socks, underwear, tights, and the like, which are made from fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics using hydrophobic fibers such as acrylic fibers, polyester fibers, and nylon fibers, and hydrophilic fibers such as cotton and silk.

[0054] <Optional ingredients> Optional components that may be included in the liquid laundry detergent of the present invention include organic solvents having a hydroxyl group, such as ethylene glycol, propylene glycol, glycerin, phenoxyethanol, and diethylene glycol butyl ether; hydrotropes such as cumene sulfonic acid, paratoluene sulfonic acid, metaxylene sulfonic acid, or salts thereof; one or more enzymes selected from cellulase, amylase, pectinase, protease, and lipase; and phenolic antibacterial agents. Examples of phenolic antibacterial agents include antibacterial agents having an aromatic hydrocarbon group in which one or more hydrogen atoms of the aromatic hydrocarbon are substituted with a hydroxyl group within the molecule. Examples of phenolic antibacterial agents include chlorophenolic antibacterial agents. Examples of chlorophenolic antibacterial agents include 4,4'-dichloro-2-hydroxydiphenyl ether (diclosan).

[0055] <Use of component (c) to enhance the antifoaming effect of component (b)> The present invention provides use of the following component (c) in a liquid laundry detergent containing the following components (a), (b), (c) and water, to enhance the defoaming action of component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants (b) Component: a fatty acid having 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is 32% by mass to 97% by mass, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): A quaternary ammonium salt having two aliphatic hydrocarbon groups with 6 to 8 carbon atoms. Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

[0056] In a liquid laundry detergent containing the above-mentioned component (a), component (b), and water, it has been found that the use of component (c) in combination with component (b) can enhance the defoaming action of component (b).

[0057] In the method of use of the present invention, the specific contents of the (a) component, the (b) component, the (c) component, water, and the liquid laundry detergent can be the same as those described above for the liquid laundry detergent.

[0058] <Method for defoaming liquid laundry detergent> The present invention provides a method for defoaming a liquid detergent for clothing, which comprises blending a defoaming component (c) with a liquid detergent for clothing containing the following components (a) and (b), thereby enhancing the defoaming action of component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants (b) Component: a fatty acid having 10 to 18 carbon atoms, in which the content of fatty acids having 12 carbon atoms is 32% by mass to 97% by mass, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): A quaternary ammonium salt having two aliphatic hydrocarbon groups with 6 to 8 carbon atoms. Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

[0059] The method for defoaming a liquid laundry detergent of the present invention may be a method for defoaming a cleaning liquid containing the above-mentioned liquid laundry detergent and water. In addition, in the defoaming method for a liquid laundry detergent of the present invention, the specific contents of component (a), component (b), component (c), water, and the liquid laundry detergent can be the same as those described above for the liquid laundry detergent. [Example]

[0060] ·Production of internal olefin a1 with 16 carbon atoms According to the method below, an internal olefin a1 having 16 carbon atoms, which is used as a raw material for the component (a1-1), was produced. The internal olefin having 16 carbon atoms was produced in accordance with Production Example C of JP 2014-76988 A. The double bond distribution of the internal olefin is as follows: In the internal olefin a1, the mass proportions of the internal olefins having double bonds at the following positions were 1st / 2nd / 3rd / 4th / 5th / 6th / 7th / 8th = 2.3% / 23.6% / 18.9% / 17.5% / 13.7% / 11.2% / 6.4% / 6.4% (total 100% by mass).

[0061] The double bond distribution of the internal olefin a1 was measured by gas chromatography (hereinafter abbreviated as GC). Specifically, the internal olefin was reacted with dimethyl disulfide to form a dithiolated derivative, and each component was then separated by GC. The resulting percentage of the double bond distribution of the internal olefin was calculated from each peak area, and this percentage was used as the mass percentage. For olefins with 16 carbon atoms, internal olefins with a double bond at the 7th position and internal olefins with a double bond at the 8th position cannot be distinguished structurally, but they can be distinguished after sulfonation. Therefore, for convenience, the amount of internal olefins with a double bond at the 7th position divided by 2 is shown in each column. The apparatus and analytical conditions used for the measurement are as follows: GC system "HP6890" (manufactured by Hewlett Packard), column "Ultra-Alloy-1HT capillary column" (30 m x 250 μm x 0.15 μm, manufactured by Frontier Labs), detector (hydrogen flame ionization detector (FID)), injection temperature 300 °C, detector temperature 350 °C, He flow rate 4.6 mL / min

[0062] [Production of (a1-1)] The internal olefin a1 was sulfonated in a thin-film sulfonation reactor equipped with an external jacket by passing sulfur trioxide gas and cooling water at 20°C through the reactor's external jacket. The molar ratio of SO3 / internal olefin during the sulfonation reaction was set to 1.09. The resulting sulfonated product was added to an alkaline aqueous solution prepared with 1.5 molar equivalents of potassium hydroxide relative to the theoretical acid value, and neutralized at 30°C for 1 hour while stirring. The neutralized product was heated in an autoclave at 160°C for 1 hour to hydrolyze the product, yielding a crude potassium internal olefin sulfonate product with 16 carbon atoms. 300 g of the crude product was transferred to a separatory funnel, and 300 mL of ethanol was added. Oil-soluble impurities were extracted and removed by adding 300 mL of petroleum ether per addition. During this process, inorganic compounds (mainly potassium sulfate) precipitated at the oil-water interface upon the addition of ethanol were also separated and removed from the aqueous phase by oil-water separation. This extraction and removal procedure was repeated three times. The aqueous phase was evaporated to dryness to obtain potassium internal olefin sulfonate.

[0063] <Composition ingredients> The following components were used in the examples and comparative examples. The mass % of the blended components in the tables is all based on the pure content. [Component (a)] Component (a1) (a1-1): Potassium salt of an internal olefin sulfonate having 16 carbon atoms, produced by the above method (a1-2): Sodium alkylbenzenesulfonate (the alkyl group is a mixed alkyl group with decyl groups / nonyl groups / dodecyl groups / tridecyl groups = 1 / 3 / 3 / 3 (mass ratio)) ·(a2) component (a2-1): Sodium polyoxypropylene lauryl ether sulfate (average number of moles of oxypropylene groups added: 1.2 moles) (a2-2): Sodium polyoxyethylene lauryl ether sulfate (average number of added moles of oxyethylene groups: 1 mole) (a2-3): Sodium polyoxyethylene alkyl ether sulfate (average number of moles of oxyethylene groups added: 2.5 moles; alkyl groups are mixed alkyl groups with a composition of lauryl groups / myristyl groups / palmityl groups = 6 / 3 / 1 (mass ratio)) (a2-4): Sodium polyoxyethylene alkyl ether sulfate (average number of moles of oxyethylene groups added: 1.4 moles; alkyl groups are mixed alkyl groups with a lauryl / myristyl ratio of 7 / 3 (mass ratio)) ·(a3) component (a3-1): Polyoxyethylene lauryl ether (average number of added moles of polyoxyethylene groups: 10 moles) (a3-2): Alkyldimethylamine oxide (the alkyl group is a mixed alkyl group with lauryl groups / myristyl groups = 6 / 4 (mass ratio)) (a3-3): Polyoxyethylene alkyl ether (the average number of added moles of polyoxyethylene groups is 8 moles, and the alkyl group is a mixed alkyl group with lauryl groups / myristyl groups / palmityl groups = 5 / 4 / 1 (mass ratio)) (a3-4): Polyoxyethylene polyoxypropylene alkyl ether (average number of moles of oxypropylene groups added: 4 moles; average number of moles of oxyethylene groups added: 17 moles; oxyethylene groups added after oxypropylene groups; alkyl group ratio: lauryl groups / myristyl groups: 55 / 45 (mass ratio))

[0064] [(b) component] The fatty acids (b-1) to (b-6) having the compositions shown in Table 1 were used. The content of fatty acids having 12 carbon atoms in component (b) and the following component (b') was calculated according to the method described above in <Method for calculating fatty acid composition>.

[0065] [Component (b'): Comparative compound of component (b)] Components (b'-1) to (b'-5), which are fatty acids having the compositions shown in Table 1, were used.

[0066] [Table 1]

[0067] [(c) component] ·(c1) component (c1-1): N,N-dioctyl-N,N-dimethylammonium chloride (c1-2): N-hexyl-N-octyl-N,N-dimethylammonium bromide ·(c2) component (c2-1): N,N-dioctylmethylamine (c2-2): N-hexyl-N-octyl-N-methylamine

[0068] [Component (c'): Comparative compound of component (c)] (c'-1): N-octyl-N,N,N-trimethylammonium chloride (c'-2): N,N-didecyl-N,N-dimethylammonium chloride

[0069] 〔water〕 Ion-exchanged water

[0070] <Preparation of liquid laundry detergent> The liquid laundry detergents shown in Tables 2 to 5 were prepared as follows. A 5 cm long Teflon stirrer was placed in a 200 mL glass beaker and the mass was measured. Next, 90% by mass of water (30°C) was added to bring the total weight to 100 g, and while stirring with a magnetic stirrer at 100 r / min, component (a), component (b) or (b'), and component (c) or (c') were added. After stirring for 30 minutes, ion-exchanged water was added to bring the total weight to 100 g. After stirring for 15 minutes at 100 r / min, a liquid laundry detergent was prepared.

[0071] [Method for evaluating antifoam effect] 50 g of water from Wakayama Prefecture was placed in a No. 8 screw tube (Maruem) and then placed in an ice bath to adjust the water temperature to 5°C. The laundry liquid detergents shown in Tables 2 to 5 were added to the water to a concentration of 40 g / 30 L, and the water was shaken up and down at 300 rpm for 5 minutes using a shaker (TAITEC, STRONG SHAKER SR-2 DW). Five minutes after shaking began, shaking was stopped. The time immediately after shaking stopped was designated 0 min. The height of the top of the foam from the boundary between the liquid and the foam was measured with a ruler at 2 min, 5 min, 10 min, and 15 min. The defoaming rate was calculated using the following formula (1). The larger the value, the higher the defoaming effect.

[0072]

number

[0073] [Table 2]

[0074] As can be seen from the results in Table 2, the liquid laundry detergents in Examples 1 and 2, which contained component (c), exhibited a high defoaming effect. However, the liquid laundry detergents in Comparative Example 1, which did not contain component (c), and Comparative Examples 2 and 3, which contained component (c'), a comparative compound of component (c), exhibited a low defoaming effect, even though they contained fatty acids.

[0075] [Table 3]

[0076] The results in Table 3 show that the liquid laundry detergents of Examples 3 to 6 using component (b) had a higher defoaming effect when the content of 12-carbon fatty acids in the fatty acids having 10 to 18 carbon atoms was 32% to 97% by mass. Furthermore, comparative examples 4 and 5 show that the defoaming effect was low when the content of 12-carbon fatty acids in the fatty acids having 10 to 18 carbon atoms was outside the range described in the present invention. In comparative examples 6 to 8, the defoaming effect was low when only fatty acids having 12, 14, or 16 carbon atoms were used.

[0077] [Table 4]

[0078] [Table 5]

[0079] Comparing the liquid laundry detergent of Example 7 with the liquid laundry detergents of Examples 11 and 12 shown in Table 5, the liquid laundry detergent of Example 13 with the liquid laundry detergent of Example 14, and the liquid laundry detergent of Example 15 with the liquid laundry detergent of Example 16, it can be seen that the higher the mass ratio of the amine (c2) component relative to the mass of the amine (c1) component in the (c) component, the higher the defoaming effect.

Claims

1. A liquid laundry detergent comprising the following components (a), (b), and (c), and water: Component (a): one or more surfactants selected from (a1) anionic surfactants having a sulfonate group (hereinafter referred to as component (a1)), (a2) anionic surfactants having a sulfate ester group (hereinafter referred to as component (a2)), and (a3) ​​nonionic surfactants (hereinafter referred to as component (a3)). Component (b): a fatty acid having 10 to 18 carbon atoms, the content of which is 32% by mass to 97% by mass of fatty acids having 12 carbon atoms, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): a quaternary ammonium salt having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

2. 2. The liquid detergent for clothing according to claim 1, wherein the content of component (a) in the detergent is 10% by mass or more and 70% by mass or less, the content of component (b) is 0.1% by mass or more and 15% by mass or less, and the content of component (c) is 0.1% by mass or more and 10% by mass or less.

3. 3. The liquid detergent for clothing according to claim 1 or 2, wherein the component (a) comprises two or more surfactants selected from the component (a1), the component (a2), and the component (a3), and the surfactants comprise surfactants belonging to different groups among the group of compounds corresponding to the component (a1), the group of compounds corresponding to the component (a2), and the group of compounds corresponding to the component (a3).

4. The liquid detergent for clothes according to claim 1 or 2, wherein component (a) comprises an anionic surfactant and a nonionic surfactant.

5. 3. The liquid detergent for clothing according to claim 1, wherein the mass of component (c) per 1 part by mass of component (b) is 0.1 parts by mass or more and 10 parts by mass or less.

6. 3. The liquid detergent for clothing according to claim 1, wherein the mass of the component (c2) per 1 part by mass of the component (c1) is 0.005 parts by mass or more and 5 parts by mass or less.

7. 1. Use of the following component (c) in a liquid laundry detergent containing the following components (a), (b), (c) and water, for enhancing the defoaming action of the component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants Component (b): a fatty acid having 10 to 18 carbon atoms, the content of which is 32% by mass to 97% by mass of fatty acids having 12 carbon atoms, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): a quaternary ammonium salt having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

8. A method for defoaming a liquid detergent for clothing, comprising blending a defoaming component (c) with a liquid detergent for clothing containing the following components (a) and (b), thereby enhancing the defoaming action of component (b): Component (a): (a1) one or more surfactants selected from anionic surfactants having a sulfonate group, (a2) anionic surfactants having a sulfate ester group, and (a3) ​​nonionic surfactants Component (b): a fatty acid having 10 to 18 carbon atoms, the content of which is 32% by mass to 97% by mass of fatty acids having 12 carbon atoms, or a salt thereof Component (c): Two or more compounds selected from the following components (c1) and (c2), including components (c1) and (c2): Component (c1): a quaternary ammonium salt having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms Component (c2): a tertiary amine or a salt thereof having two aliphatic hydrocarbon groups each having 6 to 8 carbon atoms

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