Powder detergent composition

Abstract

To provide: a powder detergent composition which can be prevented from causing foam overflow even when a drum-type washing machine is used while excellent in washability for sebum stains and a bleaching property for yellowing, the sebum stains and the yellowing deposited on fiber products, with the washing machine; and a washing method of the fiber products.SOLUTION: A powder detergent composition contains the following component (a) of 5.0 mass% or more and 20.0 mass% or less, the following component (b) of 1.0 mass% or more and 20.0 mass% or less, and the following component (c) of 0.1 mass% or more and 5.0 mass% or less: the component (a): a surfactant (but excluding the component (c)) containing one or more anion surfactants (hereinafter referred to as a component (a11)) selected from polyoxyethylene alkyl or alkenyl ether sulfuric ester, α-sulfo fatty acid ester, and a salt thereof, with a proportion of the component (a11) contained in the component (a) being 20 mass% or more; the component (b): percarbonate; and the component (c): alkanoyl- or alkenoyl-oxybenzenesulfonate or a salt thereof.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a powder detergent composition and a method for cleaning textile products. [Background technology]

[0002] There are two main methods for washing textile products such as clothing: hand washing and washing in a washing machine. In recent years, washing machines have become popular in Asia, and drum-type washing machines are becoming increasingly popular. In Asia, in order to remove sebum stains and yellowing from soiled clothing, particularly white shirts such as school uniforms, the clothes are soaked in a powder detergent composition and then hand-washed before being washed in a washing machine.

[0003] Patent Document 1 discloses a cleaning composition containing a percarbonate, a compound represented by general formula (I) or (II), and a surfactant, wherein when 25 g of the composition is dissolved in 30 liters of water at 20°C, the available oxygen concentration after 1 minute is 0.5 to 5 ppm and the organic peracid concentration is 1 to 20 ppm. US Patent No. 5,949,999 discloses a granular detergent composition containing an oligomeric or low molecular weight polymeric ester composition that is useful as a soil release agent. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-129290 [Patent Document 2] Japanese Patent Application Publication No. 03-169847 Summary of the Invention [Problem to be solved by the invention]

[0005] Soaking in a powder detergent composition and hand-washing before washing in a washing machine are physically and mentally tiring tasks, and there is a need for a powder detergent composition that can wash out sebum stains and yellowing on washing-machine soiled clothing, particularly white shirts such as school uniforms, to a white finish without soaking or hand-washing. Generally, to impart high detergency to a powder detergent composition, the surfactant content must be increased. However, when a drum-type washing machine is used, an increase in the surfactant content raises concerns about foam overflow in the washing tub, so the surfactant content in the powder detergent composition must be reduced. There is a need for a powder detergent composition that has excellent detergency for sebum stains and excellent bleaching ability for yellowing while suppressing foam overflow in drum-type washing machines, and is suited to the widespread use of drum-type washing machines in Asia.

[0006] The present invention provides a powder detergent composition that can suppress foam overflow even when a drum-type washing machine is used, and that has excellent cleaning properties for sebum stains and excellent bleaching properties for yellowing that have adhered to textile products when washed in a washing machine, and a method for cleaning textile products. [Means for solving the problem]

[0007] The present invention relates to a powder detergent composition containing the following component (a) in an amount of 5.0% by mass or more and 20.0% by mass or less, the following component (b) in an amount of 1.0% by mass or more and 20.0% by mass or less, and the following component (c) in an amount of 0.1% by mass or more and 5.0% by mass or less: Component (a): A surfactant containing one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters, α-sulfofatty acid esters, and salts thereof (hereinafter referred to as component (a11)), wherein the content of component (a11) in component (a) is 20 mass% or more (however, component (c) is excluded). Ingredient (b): Percarbonate Component (c): Alkanoyl or alkenoyloxybenzenesulfonic acid, or a salt thereof

[0008] The present invention also relates to a method for cleaning textile products, which comprises using a cleaning liquid prepared by mixing the powder detergent composition of the present invention with water to clean the textile products. [Effects of the Invention]

[0009] The present invention provides a powder detergent composition and a method for cleaning textile products, which can suppress foam overflow even when a drum-type washing machine is used, and which has excellent cleaning properties for sebum stains and bleaching properties for yellowing that have adhered to textile products when washed in a washing machine. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Powder detergent composition] <Component (a)> The powder detergent composition of the present invention contains, as component (a), a surfactant (excluding component (c)) containing one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters, α-sulfofatty acid esters, and salts thereof (hereinafter referred to as component (a11)), wherein the content of component (a11) in component (a) is 20 mass% or more.

[0011] The surfactant of component (a) contains, as component (a11), one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters, α-sulfofatty acid esters, and salts thereof. From the viewpoint of sebum stain cleansing power, component (a11) is preferably a polyoxyalkylene alkyl or alkenyl ether sulfate ester or a salt thereof.

[0012] From the viewpoint of sebum stain cleansing power, the polyoxyalkylene alkyl or alkenyl ether sulfate ester has an alkyl or alkenyl group, preferably an alkyl group, having a carbon number of 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 oxyalkylene group of the polyoxyalkylene alkyl or alkenyl ether sulfate ester is an ethyleneoxy group or a propyleneoxy group, preferably an ethyleneoxy group. From the viewpoint of sebum cleansing power, the average number of moles of oxyalkylene groups added is preferably 0.5 or more, more preferably 1 or more, even more preferably 2 or more, and preferably 8 or less, more preferably 6 or less, even more preferably 4 or less, and still more preferably 3 or less. When the polyoxyalkylene alkyl or alkenyl ether sulfate ester is in the form of a salt, examples of the counter ion of the anionic group include alkali metal ions such as sodium ion and potassium ion; alkaline earth metal ions such as calcium ion and magnesium ion; ammonium ion; and alkanolamines having 1 to 3 alkanol groups each having 2 or 3 carbon atoms (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0013] More specifically, the α-sulfofatty acid ester or a salt thereof is preferably a compound represented by the following general formula (a11). R 11a -CH(COOR 12a )-SO3M (a11) [In the formula, R 11a is a hydrocarbon group having 8 to 18 carbon atoms, and R 12a is a methyl or ethyl group, and M is a counter ion.

[0014] In general formula (a11), R 11a From the viewpoint of cleansing power against sebum stains, represents a hydrocarbon group, preferably an alkyl or alkenyl group, more preferably an alkyl group, having a carbon number of preferably 7 or more, more preferably 9 or more, even more preferably 11 or more, and still more preferably 13 or more, and preferably 17 or less, more preferably 16 or less. R 12a In terms of detergency, a methyl group is preferred. Examples of the counter ion of M include alkali metal ions such as sodium ion and potassium ion; alkaline earth metal ions such as calcium ion and magnesium ion; ammonium ion; and alkanolamines having 1 to 3 alkanol groups having 2 or 3 carbon atoms (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0015] Component (a) may contain, as component (a12), an anionic surfactant other than component (a11) (but excluding component (c)). Examples of component (a12) include one or more anionic surfactants selected from alkylbenzenesulfonates, alkyl or alkenyl sulfate ester salts, olefinsulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylate salts, N-acylamino acids, phosphoric acid mono- or diesters, and sulfosuccinate esters. The alkyl or alkenyl group of these anionic surfactants has, for example, 8 to 22 carbon atoms. Counter ions of the anionic groups of these anionic surfactants include alkali metal ions such as sodium ions and potassium ions; alkaline earth metal ions such as calcium ions and magnesium ions; ammonium ions; and alkanolamines having 1 to 3 alkanol groups each having 2 or 3 carbon atoms (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0016] From the viewpoint of sebum stain cleansing power, component (a12) is preferably one or more anionic surfactants selected from alkylbenzenesulfonic acid, alkyl or alkenyl sulfate esters, and salts thereof, and more preferably alkylbenzenesulfonic acid or a salt thereof. The number of carbon atoms in the alkyl group of the alkylbenzenesulfonic acid is preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 14 or less, and the alkyl group is preferably linear. The number of carbon atoms in the alkyl or alkenyl group of the alkyl or alkenyl sulfate ester is preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 14 or less.

[0017] Component (a) may contain one or more surfactants selected from a nonionic surfactant (hereinafter referred to as component (a2)), a cationic surfactant (hereinafter referred to as component (a3)), and an amphoteric surfactant (hereinafter referred to as component (a4)).

[0018] The nonionic surfactant of component (a2) is preferably a nonionic surfactant containing alkyleneoxy groups, in which the average number of moles of alkyleneoxy groups added is 1 or more and 30 or less (hereinafter referred to as component (a21)). The alkyleneoxy group of component (a21) is preferably one or more groups selected from alkyleneoxy groups having from 2 to 4 carbon atoms. The alkyleneoxy group having from 2 to 4 carbon atoms is preferably one or more groups selected from an ethyleneoxy group and a propyleneoxy group. From the viewpoint of detergency, the average number of moles of alkyleneoxy groups added in component (a21) is 1 or more, preferably 6 or more, more preferably 10 or more, and 30 or less, preferably 25 or less, more preferably 20 or less.

[0019] Component (a21) is preferably a nonionic surfactant represented by the following general formula (a21). R 21a (CO) m O-(A 21a O) n -R 22a (a21) [In the formula, R 21a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms, and R 22a is a hydrogen atom or a methyl group. CO is a carbonyl group, and m is the number 0 or 1. A 21a The O group is an alkyleneoxy group containing an ethyleneoxy group and having 2 to 4 carbon atoms. n is the average number of moles added and is a number of 1 to 30.

[0020] In general formula (a21), R21a From the viewpoint of detergency, the number of carbon atoms in R is 8 or more, preferably 10 or more, more preferably 12 or more, and 18 or less, preferably 16 or less, more preferably 14 or less. 21a is an aliphatic hydrocarbon group, preferably a group selected from alkyl groups and alkenyl groups.

[0021] In general formula (a21), A 21a The O group is an alkyleneoxy group containing an ethyleneoxy group and having 2 to 4 carbon atoms, preferably an alkyleneoxy group containing an ethyleneoxy group and having 2 to 3 carbon atoms, and more preferably an ethyleneoxy group. 21a The O group may be an alkyleneoxy group, including an ethyleneoxy group and another alkyleneoxy group, such as a propyleneoxy group. The other alkyleneoxy group is preferably a propyleneoxy group. 21a 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.

[0022] In the general formula (a21), n ​​is A 21a This is the average number of moles of O groups added, and is a number of 1 to 30. In general formula (a21), n ​​is 1 or more, preferably 6 or more, more preferably 10 or more, and 30 or less, preferably 25 or less, more preferably 20 or less, from the viewpoint of detergency.

[0023] Specific examples of nonionic surfactants other than component (a21) that do not have an alkyleneoxy group include one or more selected from sucrose fatty acid esters, glycerin fatty acid esters, sorbitan fatty acid esters, alkyl glycosides, and glyceryl monoethers.

[0024] The cationic surfactant of component (a3) ​​is preferably one or more cationic surfactants selected from (a31) a compound represented by the following general formula (a31) (hereinafter referred to as component (a31)) and (a32) a compound represented by the following general formula (a32) (hereinafter referred to as component (a32)).

[0025] [ka]

[0026] [In the formula, R 31a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms, and R 32a is a group selected from an aliphatic hydrocarbon group having from 8 to 18 carbon atoms, an alkyl group having from 1 to 3 carbon atoms, and a hydroxyalkyl group having from 1 to 3 carbon atoms, and R 33a and R 34a 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, and X - is an anion.

[0027] [ka]

[0028] [In the formula, R 35a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms, and R 36a and R 37a 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, and X - is an anion.

[0029] In general formula (a31), R 31a From the viewpoint of detergency, the number of carbon atoms in R is 8 or more, preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 16 or less. 31a is preferably an alkyl group or an alkenyl group, and is preferably an alkyl group. In general formula (a31), R 32a is a group selected from aliphatic hydrocarbon groups having 8 to 18 carbon atoms, alkyl groups having 1 to 3 carbon atoms, and hydroxyalkyl groups having 1 to 3 carbon atoms. R 32a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms, R32a From the viewpoint of detergency, the alkyl group or alkenyl group preferably has 8 or more carbon atoms, preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 16 or less, and is preferably an alkyl group.

[0030] In general formula (a31), R 33a and R 34a 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. 33a and R 34a are preferably each independently a group selected from alkyl groups having 1 to 3 carbon atoms. Examples of alkyl groups having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Examples of hydroxyalkyl groups having 1 to 3 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, and a hydroxypropyl group.

[0031] In general formula (a31), X - is an anion. Examples of anions include halide ions, such as chloride, bromide, and iodide. Also included are alkyl sulfate ions having 1 to 3 carbon atoms, such as methyl sulfate, ethyl sulfate, and propyl sulfate.

[0032] In general formula (a32), R 35a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms. 35a From the viewpoint of detergency, the number of carbon atoms in R is 8 or more, preferably 10 or more, and preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less. 35a is preferably an alkyl group or an alkenyl group, and is preferably an alkyl group.

[0033] In general formula (a32), R 36a and R 37a 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. 36a and R 37aare preferably each independently a group selected from alkyl groups having 1 to 3 carbon atoms. Examples of alkyl groups having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Examples of hydroxyalkyl groups having 1 to 3 carbon atoms include a hydroxymethyl group, a hydroxyethyl group, and a hydroxypropyl group.

[0034] In general formula (a32), X - is an anion. Examples of anions include halide ions such as chloride, bromide, and iodide. Examples of anions also include alkyl sulfate ions having 1 to 3 carbon atoms such as methyl sulfate, ethyl sulfate, and propyl sulfate.

[0035] Examples of amphoteric surfactants of component (a4) include N-alkanoylaminopropyl-N,N-dimethylamine oxide, N-alkyl-N,N-dimethylamine oxide, N-alkanoylaminopropyl-N,N-dimethyl-N-carboxymethylammonium betaine, N-alkyl-N,N-dimethyl-N-carboxymethylammonium betaine, N-alkyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, N-alkanoylaminopropyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, and N-alkanoylaminopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine. In these, the alkanoyl group is, for example, lauroyl or myristyl. In addition, in these, the alkyl group is, for example, lauryl or myristyl.

[0036] <Component (b)> The powder detergent composition of the present invention contains a percarbonate as component (b). From the viewpoints of sebum stain cleansing power, yellowing bleaching ability, and storage stability, component (b) is preferably an alkali metal percarbonate, more preferably one or more selected from sodium percarbonate and potassium percarbonate, and even more preferably sodium percarbonate. Note that percarbonate is the common name for the hydrogen peroxide of carbonate, and for example, the chemical formula of sodium percarbonate is expressed as 2Na2CO3·3H2O2.

[0037] <Ingredient (c)> The powder detergent composition of the present invention contains, as component (c), an alkanoyl or alkenoyloxybenzenesulfonic acid or a salt thereof. From the viewpoint of yellowing bleaching ability, component (c) preferably has an alkanoyl group or alkenoyl group, preferably an alkanoyl group, having 8 or more carbon atoms, 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. When component (c) is a salt, examples of the counter ion of the anionic group include alkali metal ions such as sodium ion and potassium ion; alkaline earth metal ions such as calcium ion and magnesium ion; ammonium ion; and alkanolamines having 1 to 3 alkanol groups each having 2 or 3 carbon atoms (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0038] <Composition, etc.> From the viewpoints of detergency for sebum stains and prevention of foam overflow in the washing machine tub, the powder detergent composition of the present invention contains component (a) in an amount of 5.0 mass % or more, preferably 8.0 mass % or more, more preferably 12.0 mass % or more, and 20.0 mass % or less, preferably 17.0 mass % or less, more preferably 15.0 mass % or less. In the powder detergent composition of the present invention, the mass of component (a11) contained in component (a) is expressed as a value converted into the sodium salt. When the powder detergent composition of the present invention contains component (a12) as component (a), the mass of component (a12) is expressed as the value converted into the sodium salt. When the powder detergent composition of the present invention contains component (a3) ​​as component (a), the mass of component (a3) ​​is expressed as the value converted into chloride.

[0039] In the powder detergent composition of the present invention, from the viewpoints of sebum stain cleansing properties and suitability for formulation into powders, the content of component (a11) in component (a) is 20% by mass or more, preferably 25% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, still more preferably 50% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less, even more preferably 70% by mass or less, and still more preferably 60% by mass or less.

[0040] From the viewpoints of sebum detergency and bleaching ability, the powder detergent composition of the present invention contains an anionic surfactant (excluding component (c)) in an amount of preferably 1.6% by mass or more, more preferably 1.8% by mass or more, even more preferably 2% by mass or more, still more preferably 8% by mass or more, still more preferably 9% by mass or more, still more preferably 10% by mass or more, and preferably 18% by mass or less, more preferably 16% by mass or less, and even more preferably 12% by mass or less. That is, from the viewpoint of sebum detergency and bleaching ability, the powder detergent composition of the present invention contains the components (a11) and (a12) in a total amount of preferably at least 1.6% by mass, more preferably at least 1.8% by mass, even more preferably at least 2% by mass, still more preferably at least 8% by mass, even more preferably at least 9% by mass, still more preferably at least 10% by mass, and preferably at most 18% by mass, more preferably at most 16% by mass, and even more preferably at most 12% by mass.

[0041] When the powder detergent composition of the present invention contains one or more selected from the group consisting of the components (a2), (a3) ​​and (a4) as the component (a), the powder detergent composition of the present invention contains, from the viewpoint of stability, preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more of surfactants other than anionic surfactants, and preferably 4% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less of surfactants other than anionic surfactants. That is, when the powder detergent composition of the present invention contains one or more selected from the group consisting of the components (a2), (a3) ​​and (a4) as the component (a), from the viewpoint of stability, the powder detergent composition of the present invention preferably contains the components (a2), (a3) ​​and (a4) in total in an amount of at least 0.1 mass%, more preferably at least 1 mass%, even more preferably at least 2 mass%, and preferably at most 4 mass%, more preferably at most 3 mass%, even more preferably at most 2 mass%.

[0042] In the powder detergent composition of the present invention, the proportion of all surfactants (excluding component (c)) in the powder detergent composition is 5.0 mass% or more, preferably 8.0 mass% or more, more preferably 12.0 mass% or more, and 20.0 mass% or less, preferably 17.0 mass% or less, more preferably 15.0 mass% or less, from the viewpoints of detergency for sebum stains and prevention of foam overflow in the washing machine drum. That is, from the viewpoints of detergency for sebum stains and prevention of foam overflow in the washing machine drum, the powder detergent composition of the present invention contains the components (a11), (a12), (a2), (a3) ​​and (a4) in a total amount of at least 5.0 mass%, preferably at least 8.0 mass%, more preferably at least 12.0 mass%, and at most 20.0 mass%, preferably at most 17.0 mass%, more preferably at most 15.0 mass%.

[0043] When the powder detergent composition of the present invention contains component (a12) as component (a), the mass ratio (a11) / (a12) of the content of component (a11) to the content of component (a12) in component (a) is, from the viewpoints of sebum stain cleansing ability, yellowing bleaching ability, and suitability for formulation into a powder, preferably 0.3 or more, more preferably 0.35 or more, even more preferably 0.5 or more, still more preferably 0.6 or more, and preferably 1.5 or less, more preferably 1.3 or less, even more preferably 1.0 or less, still more preferably 0.8 or less, and still more preferably 0.75 or less.

[0044] When the mass ratio (a11) / (a12) of the content of component (a11) to the content of component (a12) is set within the above-mentioned preferred range, the total content of the content of component (a11) and the content of component (a12) in the powder detergent composition of the present invention is preferably 18% by mass or less, more preferably 16% by mass or less, even more preferably 14% by mass or less, still more preferably 12% by mass or less, and even more preferably 10% by mass or less. Even a low content of, for example, 1.6% by mass or more, even 1.8% by mass or more, even 2% by mass or more, or even 8% by mass or more is preferred, since this further improves the yellowing bleaching rate achieved by the percarbonate of component (b) and the alkanoyl- or alkenoyloxybenzenesulfonic acid or a salt thereof of component (c) of the present invention.

[0045] In the powder detergent composition of the present invention, the content of the anionic surfactant in component (a) (the total content of components (a11) and (a12)) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, still more preferably 90% by mass or more, and preferably 100% by mass or less, from the viewpoints of cleansing ability against sebum stains and yellowing bleaching ability.

[0046] From the viewpoints of sebum stain cleansing ability, yellowing bleaching ability, and storage stability, the powder detergent composition of the present invention contains component (b) in an amount of 1.0 mass % or more, preferably 2.0 mass % or more, more preferably 2.5 mass % or more, and 20.0 mass % or less, preferably 15.0 mass % or less, more preferably 10.0 mass % or less, even more preferably 5.0 mass % or less, and still more preferably 4.0 mass % or less.

[0047] From the viewpoint of yellowing and bleaching properties, the powder detergent composition of the present invention contains component (c) in an amount of 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, and 5.0% by mass or less, preferably 3.0% by mass or less, more preferably 1.0% by mass or less, and even more preferably 0.8% by mass or less. In the powder detergent composition of the present invention, the mass of component (c) is expressed as a value converted into the sodium salt.

[0048] In the powder detergent composition of the present invention, the mass ratio [(b) + (c)] / (a) of the total content of components (b) and (c) to the content of component (a) is, from the viewpoints of cleansing ability for sebum stains and yellowing bleaching ability, preferably 0.2 or more, more preferably 0.25 or more, even more preferably 0.3 or more, and preferably 1.0 or less, more preferably 0.8 or less, even more preferably 0.6 or less, still more preferably 0.5 or less, and still more preferably 0.4 or less.

[0049] In the powder detergent composition of the present invention, the mass ratio of the total content of components (b) and (c) to the content of component (a11), [(b) + (c)] / (a11), is preferably 0.2 or more, more preferably 0.5 or more, even more preferably 0.8 or more, from the viewpoints of cleansing ability for sebum stains and yellowing bleaching ability, and is preferably 2.0 or less, more preferably 1.6 or less, even more preferably 1.2 or less, and still more preferably 1.0 or less.

[0050] In the powder detergent composition of the present invention, the mass ratio (b) / (c) of the content of component (b) to the content of component (c) is preferably 3.0 or more and preferably 20.0 or less, more preferably 15.0 or less, even more preferably 10.0 or less, still more preferably 8.0 or less, still more preferably 7.0 or less, and still more preferably 6.5 or less, from the viewpoint of yellowing and bleaching properties.

[0051] From the viewpoint of detergency, the powder detergent composition of the present invention may contain an alkaline agent as component (d), which may be one or more alkaline agents selected from alkali metal carbonates, alkali metal bicarbonates, alkali metal silicates, and tripolyphosphates.

[0052] Examples of alkali metal carbonates include sodium carbonate and potassium carbonate, with sodium carbonate being preferred. Examples of the alkali metal hydrogen carbonate include sodium hydrogen carbonate and potassium hydrogen carbonate. Examples of alkali metal silicates include sodium silicate and potassium silicate. Tripolyphosphates include alkali metal salts of tripolyphosphate.

[0053] From the viewpoint of detergency, component (d) is preferably one or more alkaline agents selected from alkali metal carbonates, alkali metal bicarbonates, and alkali metal silicates, more preferably one or more alkaline agents selected from sodium carbonate, sodium bicarbonate, and sodium silicate, and even more preferably sodium carbonate.

[0054] When the powder detergent composition of the present invention contains component (d), from the viewpoint of detergency, the powder detergent composition contains component (d) in an amount of preferably 2% by mass or more, more preferably 5% by mass or more, even more preferably 10% by mass or more, still more preferably 12% by mass or more, and preferably 30% by mass or less, more preferably 20% by mass or less, and even more preferably 18% by mass or less.

[0055] From the viewpoint of flowability of the powder detergent composition, the powder detergent composition of the present invention may contain, as component (e), one or more compounds selected from zeolite and bentonite.

[0056] Zeolite is also called crystalline aluminosilicate. Specific zeolites include crystalline aluminosilicates such as A-type, X-type, and P-type zeolite. The average primary particle size is preferably 0.1 μm or more, more preferably 1 μm or more, and preferably 10 μm or less, more preferably 5 μm or less. A preferred crystalline aluminosilicate is A-type zeolite (for example, trade name "Toyobuilder" manufactured by Tosoh Corporation, oil absorption capacity according to JISK 5101 method: 40 mL / 100 g or more). Other suitable zeolites include P-type zeolites (e.g., trade names "Doucil A24" and "ZSEO64"; both manufactured by Crosfield; oil absorption capacity 60 to 150 mL / 100 g), X-type zeolites (e.g., trade name "Wessalith XD"; manufactured by Degussa; oil absorption capacity 80 to 100 mL / 100 g), and hybrid zeolites described in WO 98 / 42622.

[0057] The bentonite preferably has an ion exchange capacity of 50 to 100 meq / 100 g. Examples of bentonite include one or more selected from (e1) montmorillonite mineral clays (smectitic clays) selected from the group consisting of alkali metal or alkaline earth metal montmorillonite, saponite, and hectorite, (e2) illite, (e3) attapulgite, and (e4) kaolinite. Granulated bentonite can be used. For example, see JP 2008-189719 A for a granulated clay mineral.

[0058] When the powder detergent composition of the present invention contains component (e), the powder detergent composition contains component (e) in an amount of preferably 5% by mass or more, more preferably 8% by mass or more, even more preferably 10% by mass or more, still more preferably 12% by mass or more, and preferably 30% by mass or less, more preferably 25% by mass or less, even more preferably 20% by mass or less, and still more preferably 18% by mass or less, in view of the flowability of the powder detergent composition.

[0059] The powder detergent composition of the present invention may contain, as component (f), one or more compounds selected from inorganic sulfates and inorganic halogen compounds. Component (f) may be one or more compounds selected from sodium sulfate, magnesium sulfate, sodium chloride, and magnesium chloride. Component (f) may be either a hydrate or anhydrous.

[0060] When the powder detergent composition of the present invention contains component (f), the powder detergent composition contains component (f) in an amount of preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 40% by mass or more, and preferably 80% by mass or less, more preferably 70% by mass or less, even more preferably 60% by mass or less, and still more preferably 50% by mass or less.

[0061] From the viewpoint of detergency, the powder detergent composition of the present invention may contain, as component (g), a polymer having a carboxylic acid group or a salt thereof and a weight-average molecular weight of 3,000 or more. Component (g) may be one or more selected from a polymer selected from polyacrylic acid or a salt thereof, and a copolymer of acrylic acid and maleic acid or a salt thereof (hereinafter referred to as component (g1)), and carboxymethyl cellulose or a salt thereof (hereinafter referred to as component (g2)). Examples of polyacrylic acid or a salt thereof include polyacrylic acid, sodium polyacrylate, potassium polyacrylate, etc., and preferably sodium polyacrylate and potassium polyacrylate. Examples of the copolymer of acrylic acid and maleic acid or its salt include a copolymer of acrylic acid and maleic acid, a sodium salt of a copolymer of acrylic acid and maleic acid, and a potassium salt of a copolymer of acrylic acid and maleic acid, and preferably a sodium salt of a copolymer of acrylic acid and maleic acid and a potassium salt of a copolymer of acrylic acid and maleic acid. The molar ratio of the copolymer of acrylic acid and maleic acid, in terms of moles of acrylic acid / moles of maleic acid, is preferably 1 / 99 or more, more preferably 10 / 90 or more, and preferably 99 / 1 or less, more preferably 90 / 10 or less.

[0062] Component (g1) may be a copolymer containing a monomer other than acrylic acid and maleic acid that is copolymerizable with acrylic acid and / or maleic acid, so long as the effects of the present invention are not impaired. Examples of monomers other than acrylic acid and maleic acid that are copolymerizable with acrylic acid and / or maleic acid include vinyl monomers, acrylic monomers, and styrene monomers, and more specifically, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, and styrene. The molar ratio of the monomer other than acrylic acid and maleic acid that is copolymerizable with acrylic acid and / or maleic acid in component (g1) is preferably 0 mol% or more, and preferably 5 mol% or less, more preferably 3 mol% or less, and even more preferably 0 mol%. Therefore, the polyacrylic acid or its salt, and the copolymer of acrylic acid and maleic acid or its salt of the present invention may be a polymer or copolymer containing, among all constituent monomers, monomers other than acrylic acid and maleic acid that are copolymerizable with acrylic acid and / or maleic acid in an amount ranging from 0 mol % to 5 mol %.

[0063] The weight average molecular weight of component (g1) is preferably 30,000 or more, more preferably 35,000 or more, even more preferably 40,000 or more, still more preferably 50,000 or more, even more preferably 60,000 or more, even more preferably 70,000 or more, even more preferably 80,000 or more, even more preferably 90,000 or more, and preferably 1,000,000 or less, more preferably 500,000 or less, even more preferably 200,000 or less. The weight average molecular weight of component (g2) is preferably 100,000 or more, more preferably 300,000 or more, and preferably 2,000,000 or less, more preferably 1,000,000 or less, and even more preferably 500,000 or less. The degree of etherification of component (g2) is preferably 0.1 or more, more preferably 0.3 or more, and preferably 0.8 or less, more preferably 0.6 or less. The weight average molecular weight can be measured according to the following method for measuring weight average molecular weight. <Method for measuring weight average molecular weight> The weight average molecular weight of component (g) can be measured by GPC (gel permeation chromatography) and the weight average molecular weight (Mw) can be determined using a conversion standard substance. The GPC measurement conditions are shown below. Column: Tosoh Corporation, product name: TSK-GEL guard PWXL Tosoh Corporation, product name: TSK-GEL G4000 PWXL Tosoh Corporation, product name: TSK-GEL G2500 PWXL Mobile phase: 0.1 mol / L potassium dihydrogen phosphate and 0.1 mol / L sodium dihydrogen phosphate aqueous solution / acetonitrile = 90 / 10 (volume ratio) Detector: Differential refractive index detector Column temperature: 40℃ ·Flow rate: 1.0mL / min Conversion standard: Polyacrylic acid (American Standard Corporation) Sample: Add ion-exchanged water to a polymer aqueous solution containing 0.8 g of solids to make the total volume 200 mL, and then take 10 μL of this solution and inject it into the column.

[0064] When the powder detergent composition of the present invention contains component (g), from the viewpoints of detergency and stability, the powder detergent composition contains component (g) in an amount of preferably 0.1% by mass or more, more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, still more preferably 1.5% by mass or more, and preferably 20.0% by mass or less, more preferably 10.0% by mass or less, even more preferably 5.0% by mass or less, and still more preferably 3.0% by mass or less. When the powder detergent composition of the present invention contains the component (g), the mass of the component (g) is expressed as the value converted into the sodium salt.

[0065] From the viewpoint of stability, the powder detergent composition of the present invention may contain, as component (h), a polyalkylene glycol having a weight-average molecular weight of 100 or more and 100,000 or less. The component (h) may be one or more selected from polyethylene glycol and polypropylene glycol. The weight average molecular weight of component (h) is 100 or more, preferably 1,000 or more, more preferably 5,000 or more, even more preferably 10,000 or more, and 100,000 or less, preferably 50,000 or less, more preferably 20,000 or less. Here, the weight average molecular weight of component (h) is a value determined by gel permeation chromatography using polystyrene as a standard substance.

[0066] When the powder detergent composition of the present invention contains component (h), from the viewpoint of stability, the powder detergent composition contains component (h) in an amount of preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, and preferably 1% by mass or less, more preferably 0.7% by mass or less, even more preferably 0.5% by mass or less.

[0067] The powder detergent composition of the present invention can contain water. Deionized water (sometimes also referred to as ion-exchanged water) or water with 1 mg / kg or more and 5 mg / kg or less of sodium hypochlorite added to ion-exchanged water can be used as the water. Also, tap water can be used. When the powder detergent composition of the present invention contains water, the water is preferably contained at 0.01% by mass or more, more preferably 0.1% by mass or more, still more preferably 1.0% by mass or more, and preferably 15.0% by mass or less, more preferably 10.0% by mass or less, still more preferably 5.0% by mass or less.

[0068] As other components, the powder detergent composition of the present invention can optionally contain other components known in the field of laundry detergents, such as bleaching agents (perborates, bleach activators, etc.), anti-redeposition agents, reducing agents (sulfites, etc.), fluorescent brightening agents (e.g., Tinopal CBS (trade name, manufactured by Ciba Specialty Chemicals), Whitex SA (trade name, manufactured by Sumitomo Chemical Co., Ltd.), etc.), foam suppressants (silicones, etc.), organic solvents, enzymes (cellulase, protease, peptinase, lipase, dextranase, amylase, etc.), fragrances, colorants, etc. (excluding those corresponding to components (a) to (h)).

[0069] When 1 g of the powder detergent composition of the present invention is diluted to 1000 g with ion-exchanged water, the pH at 25°C is preferably 9.0 or more, more preferably 10.0 or more, still more preferably 10.5 or more, and preferably 13.0 or less, more preferably 12.0 or less, still more preferably 11.0 or less from the viewpoint of detergency. The pH is measured according to the pH measurement method described below. <pH Measurement Method> A pH measurement combination electrode (HORIBA glass ground sleeve type) is connected to a pH meter (HORIBA pH / ion meter F-23) and the power is turned on. A saturated potassium chloride aqueous solution (3.33 mol / L) is used as the pH electrode internal solution. Next, 100 mL of pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) are each filled into a beaker and immersed in a thermostatic bath at 25°C for 30 minutes. The pH measurement electrode is immersed in the thermostatically adjusted standard solutions for 3 minutes, and calibration is performed in the following order: pH 6.86 → pH 9.18 → pH 4.01. The sample to be measured is adjusted to 25°C, and the pH meter electrode is immersed in the sample. The pH is measured after 1 minute.

[0070] From the viewpoint of usability of the powder detergent composition, the powder detergent composition of the present invention has a bulk density, measured by the method specified in JIS K 3362:2008, of preferably 1000 g / L or less, more preferably 950 g / L or less, even more preferably 900 g / L or less, and preferably 300 g / L or more, more preferably 400 g / L or more, even more preferably 500 g / L or more, still more preferably 600 g / L or more, and still more preferably 800 g / L or more.

[0071] From the viewpoint of flowability of the powder detergent composition, the powder detergent composition of the present invention has an average particle size of preferably 200 μm or more, more preferably 250 μm or more, even more preferably 300 μm or more, and preferably 650 μm or less, more preferably 600 μm or less, even more preferably 550 μm or less. Here, the average particle size is determined from the mass fraction based on the sieve opening size after vibrating the powder detergent composition for 5 minutes using a standard sieve specified in JIS Z 8801.

[0072] The powder detergent composition of the present invention can be produced by a known method, for example, spray drying, dry neutralization, dry granulation, dry blending, fluidized bed drying, thin film drying, extrusion granulation, tumbling granulation, stirring granulation, compaction granulation, surfactant loading method, or a combination of methods selected from these.

[0073] The powder detergent composition of the present invention can be suitably used for cleaning textile products, and further for cleaning textile products using a washing machine. In particular, the powder detergent composition of the present invention can suppress foam overflow in the washing tub, and therefore can be suitably used for cleaning textile products using a drum-type washing machine.

[0074] The fibers to be cleaned with the powder detergent composition of the present invention may be either hydrophobic or hydrophilic. Examples of hydrophobic fibers include protein fibers (such as milk protein casein fibers and Promix), polyamide fibers (such as nylon), polyester fibers (such as polyester), polyacrylonitrile fibers (such as acrylic), polyvinyl alcohol fibers (such as vinylon), polyvinyl chloride fibers (such as polyvinyl chloride), polyvinylidene chloride fibers (such as vinylidene), polyolefin fibers (such as polyethylene and polypropylene), polyurethane fibers (such as polyurethane), polyvinyl chloride / polyvinyl alcohol copolymer fibers (such as polycloral), polyalkylene paraoxybenzoate fibers (such as benzoate), polyfluoroethylene fibers (such as polytetrafluoroethylene), glass fibers, carbon fibers, alumina fibers, silicone carbide fibers, rock fibers, slag fibers, and metal fibers (gold thread, silver thread, and steel fiber). Examples of hydrophilic fibers include seed hair fibers (cotton, kapok, etc.), bast fibers (hemp, flax, ramie, hemp, jute, etc.), leaf vein fibers (Manila hemp, sisal, etc.), palm fibers, rush, straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuna, angora, etc.), silk fibers (domestic silk, wild silk), feathers, and cellulosic fibers (rayon, polynosic, cupra, acetate, etc.). From the viewpoint of finish quality, the fiber preferably contains cotton fiber. From the viewpoint of finish quality, the content of cotton fiber in the fiber is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 15% by mass or more, still more preferably 20% by mass or more, still more preferably 40% by mass or more, still more preferably 60% by mass or more, still more preferably 80% by mass or more, and preferably 100% by mass or less, and may be 100% by mass.

[0075] In the present invention, the textile product refers to fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics using the hydrophobic fibers or hydrophilic fibers, as well as products obtained using the same, such as undershirts, T-shirts, dress shirts, blouses, slacks, hats, handkerchiefs, towels, knitwear, socks, underwear, and tights.

[0076] [How to wash textile products] The present invention provides a method for cleaning textile products, which comprises using a cleaning liquid (hereinafter referred to as the cleaning liquid of the present invention) prepared by mixing the powder detergent composition of the present invention with water. The method for cleaning textile products of the present invention can be appropriately applied to the embodiments described for the powder detergent composition of the present invention.

[0077] In the method for washing textile products of the present invention, the amount of water used when mixing the detergent article of the present invention with water is adjusted so that the total amount of the powder detergent composition of the present invention per 1 L of water is preferably 0.1 g or more, more preferably 0.2 g or more, even more preferably 0.3 g or more, and preferably 10 g or less, more preferably 5 g or less, even more preferably 1.0 g or less, from the viewpoints of cleaning performance and rinsability.

[0078] In the method for washing textile products of the present invention, the temperature of water is preferably 10°C or higher, more preferably 20°C or higher, even more preferably 30°C or higher, and preferably 100°C or lower, more preferably 80°C or lower, even more preferably 60°C or lower, from the viewpoint of washing performance. The temperature of the cleaning solution of the present invention may be in the above range. The temperature of water used in the cleaning method, such as water used for rinsing, may also be in the above range.

[0079] From the viewpoint of detergency, the pH of the cleaning solution of the present invention at 25°C is preferably 9.0 or higher, more preferably 10.0 or higher, even more preferably 10.5 or higher, and preferably 13.0 or lower, more preferably 12.0 or lower, even more preferably 11.0 or lower. The pH is measured according to the pH measurement method described above for the powder detergent composition.

[0080] In the method for washing textile products of the present invention, the liquor ratio, which is the ratio of the mass (kg) of the textile product to the volume (liters) of the cleaning solution containing the powder detergent composition of the present invention and water, i.e., the volume (liters) of the cleaning solution of the present invention / the mass (kg) of the textile product, is preferably 8 or more, more preferably 10 or more, even more preferably 12 or more, still more preferably 15 or more, and is preferably 45 or less, more preferably 40 or less, even more preferably 30 or less, and still more preferably 20 or less, from the viewpoints of cleaning performance and economy.

[0081] In the textile cleaning method of the present invention, the cleaning time for contacting the powder detergent composition of the present invention, the textile product, and water (i.e., the cleaning time for contacting the cleaning liquid of the present invention with the textile product) is preferably 1 minute or more, more preferably 3 minutes or more, and even more preferably 5 minutes or more from the viewpoint of cleaning performance, and is preferably 1 hour or less, more preferably 45 minutes or less, and even more preferably 30 minutes or less from the viewpoint of preventing damage to clothing.

[0082] The textile product washing method of the present invention is suitable for a rotary washing method, a method in which textile products are immersed in a scouring solution while being fed by a roller or the like. A rotary washing method refers to a washing method in which textile products that are not fixed to a rotating device are rotated around a rotating shaft together with the washing solution. A rotary washing method can be performed using a rotary washing machine. Therefore, in the washing method of the present invention, it is preferable to wash the textile products using a washing machine, particularly a rotary washing machine, in order to achieve a cleaner finish for the textile products. Specific examples of rotary washing machines include drum washing machines, pulsator washing machines, and agitator washing machines. These rotary washing machines can be commercially available for home use. In particular, the textile product washing method of the present invention can suppress foam overflow in the washing tub, making it suitable for use in a textile product washing method using a drum washing machine.

[0083] After washing the textile product, it can be rinsed and dehydrated. The rinsing and dehydration can be performed using a washing machine. The rinsing and dehydration can be performed alternately multiple times. After rinsing and dehydration, the fabric can be dried. Drying can be either natural drying or heat drying. Each drying method can be performed multiple times. [Example]

[0084] [Ingredients] In the examples and comparative examples, the following components were used. <Component (a)> AES: Polyoxyethylene lauryl ether sulfate sodium (average number of added oxyethylene groups: 2 moles), component (a11), Emal 270J, manufactured by Kao Corporation α-sfe: an α-sulfofatty acid ester containing sodium α-sulfostearate methyl ester and sodium α-sulfopalmitate methyl ester in a mass ratio of 8 / 2, component (a11) LAS-Na: Sodium laurylbenzenesulfonate, Neopelex FS, manufactured by Kao Corporation, ingredient (a12) C12EO10: Polyoxyethylene lauryl ether (average number of added moles of oxyethylene groups: 10), Emulgen 110, manufactured by Kao Corporation, component (a2) ·C16TMAC: In general formula (a31), R 31a is an alkyl group having 16 carbon atoms, R 32a , R 33a and R 34a is a methyl group, X - is a chloride ion, component (a3)

[0085] <Component (b)> PC: Sodium percarbonate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Ingredient (c)> GA-10B: Sodium dodecanoyloxybenzenesulfonate, manufactured by Nitto Kasei Kogyo Co., Ltd. <Ingredient (d)> Sodium Carbonate: Sodium carbonate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Sodium Bicarbonate: Sodium bicarbonate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Sodium Silicate: Sodium silicate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Ingredient (e)> Zeolite: Zeolite, synthetic zeolite A-4, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Bentonite: Bentonite, Kunipia F, manufactured by Kunimine Industries Co., Ltd.

[0086] <Component (f)> Sodium Sulfate: Sodium sulfate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Ingredients (g)> CMC: Carboxymethyl cellulose, weight average molecular weight 480,000, degree of etherification 0.5, manufactured by Nippon Paper Industries Co., Ltd. Oligomer DT: Sodium polyacrylate, weight average molecular weight 100,000, manufactured by Kao Corporation <Component (h)> PEG: Polyethylene glycol, weight-average molecular weight 13,000, PEG-13000, manufactured by Mitsui Chemicals, Inc.

[0087] <Other ingredients> Water: Ion-exchanged water CBS: Optical brightener, Chinopal CBS, manufactured by Ciba Specialty Chemicals Savinase 8T: Enzyme (protease), manufactured by Novozymes Perfume: Fragrance (methyl salicylate), manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0088] [Preparation of Powder Detergent Composition] The above ingredients were used to prepare the powder detergent compositions shown in Table 1 by the following method. The amounts listed in the table are pure amounts. Components (a), (d), (f), (g), and (h), which are components that form spray-dried particles, were mixed to prepare a slurry, which was then spray-dried to prepare base granules. The prepared base granules were charged into a high-speed mixer (manufactured by Fukae Kogyo Co., Ltd.), and the remaining after-blend components, components (b), (c), and (e), and other components were dry-mixed to obtain each powder detergent composition with the formulation shown in Table 1. Each prepared powder detergent composition had a bulk density of 700 to 900 g / L, as measured according to the method specified in JIS K 3362:2008, and an average particle size of 300 μm, as calculated from the mass fraction based on the sieve opening size after 5 minutes of vibration using a standard sieve specified in JIS Z 8801. Table 1 also shows the pH at 25° C. when 1 g of each of the prepared powder detergent compositions was diluted with ion-exchanged water to 1,000 g.

[0089] [Sebum cleansing power evaluation] <Preparation of model sebum soil> A model sebum soil having the following composition was prepared and used to prepare an artificial soiled cloth containing the model sebum soil. Model sebum soil composition: lauric acid 0.44% by mass, myristic acid 3.15% by mass, pentadecanoic acid 2.35% by mass, palmitic acid 6.31% by mass, heptadecanoic acid 0.44% by mass, stearic acid 1.6% by mass, oleic acid 7.91% by mass, triolein 13.33% by mass, n-hexadecyl palmitate 2.22% by mass, squalene 6.66% by mass, and the remainder water (total 100% by mass)

[0090] <Preparation of model sebum-stained artificially soiled cloth> A 6cm x 6cm cotton / polyester broadcloth blend (cotton / polyester ratio = 35 / 65, purchased from Tanigashira Shoten) was gravure coated with the model sebum soiling composition described above at 100mg per piece to prepare a model artificially soiled sebum soiling cloth.

[0091] <Sebum stain cleaning test> Five of the prepared model sebum-stained artificially soiled cloths were used as a set, and 1 L of a cleaning solution prepared by mixing each powder detergent composition listed in Table 1 with ion-exchanged water was placed in a Tergotometer (Ueshima MS-8212, inner diameter 12 cm, height 17.5 cm), and one set of the model sebum-stained artificially soiled cloths was added, followed by a cleaning test under the following conditions. Cleaning conditions Cleaning time: 10 minutes Powder detergent composition concentration: 1% by mass Water hardness: 4°dH Water temperature: 30℃ Rinse: Rinse with running tap water at 30°C for 5 minutes

[0092] After washing, four pieces were removed from each set of model sebum-stained artificially soiled cloths, and the sebum cleansing rate was measured using the following method. The reflectance at 550 nm of the original cloth before soiling and the model sebum-stained artificially soiled cloth before and after washing was measured using a spectrophotometer (SE-2000, manufactured by Nippon Denshoku Co., Ltd.), and the sebum cleansing rate (%) was calculated using the following formula, and the average value for the four pieces was calculated. The results are shown in Table 1. Sebum cleansing rate (%) = 100 × [(reflectance of artificially soiled cloth after washing - reflectance of artificially soiled cloth before washing) / (reflectance of original cloth - reflectance of artificially soiled cloth before washing)]

[0093] [Yellowing bleaching power evaluation] <Preparation of artificially soiled fabric with yellow stains as a model To prepare a model yellow stain, 1 g of curcumin was dissolved in 1 L of a 1:1 methanol / chloroform solvent. 200 μL of the model yellow stain, composed of the above composition, was added to each 6 cm x 6 cm cotton / polyester broadcloth blend (cotton / polyester ratio = 35 / 65, purchased from Tanigashira Shoten), to prepare a model artificially soiled yellow stain.

[0094] <Yellowing stain bleaching test> Five of the prepared model yellow-stained artificially soiled cloths were used as one set, and 1 L of a cleaning solution prepared by mixing each powder detergent composition listed in Table 1 with ion-exchanged water was placed in a Tergotometer (Ueshima MS-8212, inner diameter 12 cm, height 17.5 cm), and one set of model sebum-stained artificially soiled cloths was added, followed by a cleaning test under the following conditions. Cleaning conditions Cleaning time: 10 minutes Powder detergent composition concentration: 1% by mass Water hardness: 4°dH Water temperature: 30℃ Rinse: Rinse with running tap water at 30°C for 5 minutes

[0095] After washing, four pieces were taken out from one set of model yellow stained artificially soiled cloths, and the yellow stain bleaching rate was measured by the following method. The reflectance at 550 nm of the unsoiled raw fabric and the model yellow-stained artificially soiled fabric before and after washing was measured using a spectrophotometer (SE-2000, manufactured by Nippon Denshoku Co., Ltd.), and the yellow bleaching rate (%) was calculated using the following formula, and the average value for four pieces was calculated. The results are shown in Table 1. Yellowing bleaching rate (%) = 100 × [(reflectance of artificially soiled cloth after washing - reflectance of artificially soiled cloth before washing) / (reflectance of original cloth - reflectance of artificially soiled cloth before washing)]

[0096] [Drum-type washing machine foam overflow evaluation] Four kilograms of laundry and 30 g of each powder detergent composition listed in Table 1 were placed in a drum-type washing machine (Directr Drive (manufactured by LG)), and the laundry was washed using the normal cycle. The washing tub was visually inspected during the wash cycle, and a score of "Good" was given if no foam overflowed from the tub, and a score of "Poor" was given if foam overflowed from the tub. The results are shown in Table 1.

[0097] [Table 1]

Claims

1. 1. A powder detergent composition comprising: 5.0% by mass or more and 20.0% by mass or less of the following component (a); 1.0% by mass or more and 20.0% by mass or less of the following component (b); and 0.1% by mass or more and 5.0% by mass or less of the following component (c), wherein the mass ratio of the total content of components (b) and (c) to the content of component (a11), [(b) + (c)] / (a11), is 0.5 or more and 2.0 or less. Component (a): A surfactant containing one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters, α-sulfofatty acid esters, and salts thereof (hereinafter referred to as component (a11)), wherein the content of component (a11) in component (a) is 20 mass% or more (however, component (c) is excluded). Component (b): Percarbonate Component (c): Alkanoyl or alkenoyloxybenzenesulfonic acid, or a salt thereof

2. 1. A powder detergent composition comprising: 5.0% by mass or more and 20.0% by mass or less of the following component (a); 1.0% by mass or more and 20.0% by mass or less of the following component (b); and 0.1% by mass or more and 5.0% by mass or less of the following component (c), wherein the mass ratio of the total content of components (b) and (c) to the content of component (a), [(b) + (c)] / (a), is 0.26 or more and 1.0 or less. Component (a): A surfactant containing one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfate esters, α-sulfofatty acid esters, and salts thereof (hereinafter referred to as component (a11)), wherein the content of component (a11) in component (a) is 20 mass% or more (however, component (c) is excluded). Component (b): Percarbonate Component (c): Alkanoyl or alkenoyloxybenzenesulfonic acid, or a salt thereof

3. 3. The powder detergent composition according to claim 1, wherein the content of the anionic surfactant in component (a) is 50% by mass or more.

4. 3. The powder detergent composition according to claim 1, wherein the content of component (a11) in component (a) is 50 mass% or more.

5. 3. The powder detergent composition according to claim 1, wherein component (a11) is a polyoxyalkylene alkyl or alkenyl ether sulfate or a salt thereof.

6. 3. The powder detergent composition according to claim 1, wherein the mass ratio (b) / (c) of the content of the component (b) to the content of the component (c) is 3.0 or more.

7. 3. The powder detergent composition according to claim 1, wherein the pH of the powder detergent composition at 25°C when 1 g of the powder detergent composition is diluted to 1,000 g with ion-exchanged water is 9.0 or higher.

8. The powder detergent composition according to claim 1 or 2, which is for use on textile products.

9. A method for cleaning textile products, comprising the step of: cleaning textile products with a cleaning liquid comprising a mixture of the powder detergent composition according to claim 1 or 2 and water.