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 more and more 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, the cleaning composition having an available oxygen concentration of 0.5 to 5 ppm and an organic peracid concentration of 1 to 20 ppm after 1 minute when 25 g of the composition is dissolved in 30 liters of water at 20°C. US Pat. No. 5,399,633 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] JP 2000-129290 A [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 is physically and mentally tiring work, and there is a demand for a powder detergent composition that can wash out sebum stains and yellowing on clothes soiled in a washing machine, particularly white shirts such as school uniforms, to a white state without soaking or hand washing. Generally, in order to impart high detergency to a powder detergent composition, it is necessary to increase the surfactant content, but when a drum-type washing machine is used, an increase in the surfactant content raises concerns about foam overflow in the washing tub, and therefore it is necessary to reduce the surfactant content in the powder detergent composition. There is a demand for a powder detergent composition that is excellent in detergency for sebum stains and bleaching for yellowing while suppressing foam overflow in a drum-type washing machine, and is suited to the widespread use of drum-type washing machines in Asia.

[0006] The present invention provides a powder detergent composition which can suppress foam overflow even when a drum-type washing machine is used, and which has excellent cleaning properties for sebum stains and excellent bleaching properties for yellowing 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 from 5.0% by mass to 20.0% by mass of the following component (a), from 1.0% by mass to 20.0% by mass of the following component (b), and from 0.1% by mass to 5.0% by mass of the following component (c): 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)), in which 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 cleaning the textile products with a cleaning liquid comprising a mixture of the powder detergent composition of the present invention and water. Effect of the Invention

[0009] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Powder detergent composition] <Component (a)> The powder detergent composition of the present invention contains, as component (a), a surfactant containing one or more anionic surfactants selected from polyoxyalkylene alkyl or alkenyl ether sulfates, 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 (excluding component (c)).

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

[0012] 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, from the viewpoint of the detergency for sebum stains. The oxyalkylene group of the polyoxyalkylene alkyl or alkenyl ether sulfate 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 the oxyalkylene group 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 even more preferably 3 or less. When the polyoxyalkylene alkyl or alkenyl ether sulfate ester 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 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 sebum stain cleansing power, 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 From the viewpoint 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] The component (a) may contain, as component (a12), an anionic surfactant other than the component (a11) (but excluding the component (c)). Examples of component (a12) include one or more anionic surfactants selected from alkylbenzenesulfonates, alkyl or alkenyl sulfates, olefinsulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, N-acylamino acids, mono- or di-phosphates, and sulfosuccinates. The alkyl or alkenyl group of these anionic surfactants has, for example, 8 to 22 carbon atoms. Examples of counter ions of the anionic groups of these anionic surfactants 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.).

[0016] From the viewpoint of sebum stain cleaning power, component (a12) is preferably one or more anionic surfactants selected from alkylbenzenesulfonic acid, and 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 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 and having an average added mole number of alkyleneoxy groups of 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. The average number of moles of alkyleneoxy groups added in component (a21) is, from the viewpoint of detergency, 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] The 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, 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 an alkyl group and an alkenyl group.

[0021] In general formula (a21), A 21a The O group is an alkyleneoxy group having 2 to 4 carbon atoms and containing an ethyleneoxy group, preferably an alkyleneoxy group having 2 to 3 carbon atoms and containing an ethyleneoxy group, 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 type or a random type.

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

[0023] Specific examples of nonionic surfactants having no alkyleneoxy group other than component (a21) 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, R 32a is a group selected from an aliphatic hydrocarbon group having 8 to 18 carbon atoms, an alkyl group having 1 to 3 carbon atoms, and a hydroxyalkyl group having 1 to 3 carbon atoms; 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; X - is an anion.

[0027] [ka]

[0028] [In the formula, R 35a is an aliphatic hydrocarbon group having 8 to 18 carbon atoms, 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; 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 an aliphatic hydrocarbon group having 8 to 18 carbon atoms, an alkyl group having 1 to 3 carbon atoms, and a hydroxyalkyl group 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, preferably is an alkyl or alkenyl group having 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 selected from alkyl groups having 1 to 3 carbon atoms. Examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Examples of the hydroxyalkyl group 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 the anion include halide ions, such as chloride, bromide, and iodide ions. 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 R 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 further 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 selected from alkyl groups having 1 to 3 carbon atoms. Examples of the alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, and a propyl group. Examples of the hydroxyalkyl group 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 the anion include halide ions, such as chloride, bromide, and iodide ions, and 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 cleaning 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 and bleaching properties, component (c) preferably has an alkanoyl group or alkenoyl group, preferably an alkanoyl 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. 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 having 2 or 3 carbon atoms (for example, monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0038] <Composition, etc.> 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, of the composition, from the viewpoints of cleaning power for sebum stains and prevention of foam overflow in the washing tub. In the powder detergent composition of the present invention, the mass of component (a11) contained in component (a) is expressed in terms of 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 in terms of 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 the chloride.

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

[0040] 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, from the viewpoints of sebum cleansing power and bleaching property. That is, from the viewpoint of sebum detergency and bleaching property, the powder detergent composition of the present invention contains preferably 1.6 mass% or more of component (a11) and component (a12) in total in the composition, more preferably 1.8 mass% or more, even more preferably 2 mass% or more, still more preferably 8 mass% or more, still more preferably 9 mass% or more, still more preferably 10 mass% or more, and preferably 18 mass% or less, more preferably 16 mass% or less, and even more preferably 12 mass% or less.

[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 a surfactant other than an anionic surfactant in the composition, and preferably 4% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less. 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 contains the components (a2), (a3) ​​and (a4) in a total amount of preferably 0.1 mass% or more, more preferably 1 mass% or more, even more preferably 2 mass% or more, and preferably 4 mass% or less, more preferably 3 mass% or less, even more preferably 2 mass% or less.

[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 tub. That is, from the viewpoint of detergency for sebum stains and prevention of foam overflowing in the washing tub, the powder detergent composition of the present invention contains the components (a11), (a12), (a2), (a3) ​​and (a4) in a total 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.

[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 is 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 within the above-mentioned preferred range, the total content of components (a11) and (a12) in the powder detergent composition of the present invention is preferably 18 mass% or less, more preferably 16 mass% or less, even more preferably 14 mass% or less, still more preferably 12 mass% or less, still more preferably 10 mass% or less, and even a low content of, for example, 1.6 mass% or more, further 1.8 mass% or more, even 2 mass% or more, or even 8 mass% or more is preferable because it can further improve the yellowing bleaching rate 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, from the viewpoints of cleaning ability against sebum stains and yellowing bleaching ability, preferably 50 mass% or more, more preferably 70 mass% or more, even more preferably 80 mass% or more, still more preferably 90 mass% or more, and preferably 100 mass% or less.

[0046] 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, from the viewpoints of cleaning ability against sebum stains, yellowing bleaching ability, and storage stability.

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

[0048] 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 (a), [(b)+(c)] / (a), is, from the viewpoints of the cleaning ability for sebum stains and the ability to bleach yellowing, preferably 0.2 or more, more preferably 0.25 or more, even more preferably 0.3 or more, and is 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 even 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, from the viewpoints of the cleaning ability for sebum stains and the ability to bleach yellowing, preferably 0.2 or more, more preferably 0.5 or more, even more preferably 0.8 or more, 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, from the viewpoint of yellowing and bleaching properties, 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.

[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 the group consisting of alkali metal carbonates, alkali metal hydrogen carbonates, alkali metal silicates, and tripolyphosphates.

[0052] Examples of the alkali metal carbonate 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. The alkali metal silicate includes 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 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), the powder detergent composition contains component (d) in an amount of preferably 2 mass % or more, more preferably 5 mass % or more, even more preferably 10 mass % or more, still more preferably 12 mass % or more, and preferably 30 mass % or less, more preferably 20 mass % or less, and even more preferably 18 mass % or less, in terms of detergency.

[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 zeolites. 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 suitable 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" 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 the hybrid zeolites described in WO 98 / 42622.

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

[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 mass % or more, more preferably 8 mass % or more, even more preferably 10 mass % or more, still more preferably 12 mass % or more, and preferably 30 mass % or less, more preferably 25 mass % or less, even more preferably 20 mass % or less, and still more preferably 18 mass % or less, in terms of 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 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 mass % or more, more preferably 30 mass % or more, even more preferably 40 mass % or more, and preferably 80 mass % or less, more preferably 70 mass % or less, even more preferably 60 mass % or less, and still more preferably 50 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. Examples of component (g) include 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 carboxymethylcellulose 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, a potassium salt of a copolymer of acrylic acid and maleic acid, etc., and preferably a sodium salt of a copolymer of acrylic acid and maleic acid, or 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 the number of moles of acrylic acid / the number of moles of maleic acid, is preferably 1 / 99 or more, more preferably 10 / 90 or more, and is 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, as long as it does not interfere with the manifestation of the effects of the present invention. 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, styrene monomers, etc., more specifically, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, styrene, etc. The molar ratio of monomers other than acrylic acid and maleic acid that are 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 a salt thereof, and the copolymer of acrylic acid and maleic acid or a salt thereof of the present invention may be a polymer or copolymer containing, among all the constituent monomers, monomers other than acrylic acid and maleic acid that are copolymerizable with acrylic acid and / or maleic acid in an amount in the range of 0 mol % or more and 5 mol % or less.

[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, even 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 the 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 the component (g) can be measured by GPC (gel permeation chromatography), and the weight average molecular weight (Mw) can be calculated using a conversion standard substance. The GPC measurement conditions are as follows. Column: Tosoh Corporation, product name: TSK-GEL guard PWXL Manufactured by Tosoh Corporation, product name: TSK-GEL G4000 PWXL Manufactured by 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: Refractive index detector Column temperature: 40℃ ·Flow rate: 1.0mL / min Conversion standard material: Polyacrylic acid (American Standard Corporation) Sample: Add ion-exchanged water to an aqueous polymer 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 cleaning ability and stability, the powder detergent composition contains component (g) in an amount of preferably 0.1 mass % or more, more preferably 0.5 mass % or more, even more preferably 1.0 mass % or more, still more preferably 1.5 mass % or more, and preferably 20.0 mass % or less, more preferably 10.0 mass % or less, even more preferably 5.0 mass % or less, and still more preferably 3.0 mass % or less. When the powder detergent composition of the present invention contains the component (g), the mass of the component (g) is expressed in terms of 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 1000 or more, more preferably 5000 or more, even more preferably 10000 or more, and is 100000 or less, preferably 50000 or less, more preferably 20000 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 mass % or more, more preferably 0.2 mass % or more, even more preferably 0.3 mass % or more, and preferably 1 mass % or less, more preferably 0.7 mass % or less, even more preferably 0.5 mass % or less.

[0067] The powder detergent composition of the present invention can contain water. As the water, deionized water (sometimes also referred to as ion-exchanged water) or water obtained by adding 1 mg / kg or more and 5 mg / kg or less of sodium hypochlorite to ion-exchanged water can be used. Tap water can also be used. When the powder detergent composition of the present invention contains water, the water is preferably contained in an amount of 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.), antifoaming agents (silicones, etc.), organic solvents, enzymes (cellulase, protease, peptinase, lipase, dextranase, amylase, etc.), fragrances, colorants, etc. (provided that those corresponding to components (a) to (h) are excluded).

[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 composite electrode for pH measurement (glass-ground sleeve type, manufactured by HORIBA) is connected to a pH meter (pH / ion meter F-23, manufactured by HORIBA) and the power is turned on. A saturated potassium chloride aqueous solution (3.33 mol / L) is used as the internal solution of the pH electrode. Next, a 100 mL beaker is filled with a pH 4.01 standard solution (phthalate standard solution), a pH 6.86 standard solution (neutral phosphate standard solution), and a pH 9.18 standard solution (borate standard solution), and the beaker is immersed in a thermostatic bath at 25°C for 30 minutes. The pH measurement electrode is immersed in the thermostatically adjusted standard solution for 3 minutes, and the calibration operation is performed in the order of pH 6.86 → pH 9.18 → pH 4.01. The sample to be measured is adjusted to 25°C, the electrode of the pH meter is immersed in the sample, and 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 even more preferably 800 g / L or more.

[0071] From the viewpoint of flowability of the powder detergent composition of the present invention, the average particle size is 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 size of the sieve openings after vibrating the powder detergent composition for 5 minutes using a JIS Z 8801 standard sieve.

[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 supporting method, or a combination of methods selected from these.

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

[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 (milk protein casein fibers, promix, etc.), polyamide fibers (nylon, etc.), polyester fibers (polyester, etc.), polyacrylonitrile fibers (acrylic, etc.), polyvinyl alcohol fibers (vinylon, etc.), polyvinyl chloride fibers (polyvinyl chloride, etc.), polyvinylidene chloride fibers (vinylidene, etc.), polyolefin fibers (polyethylene, polypropylene, etc.), polyurethane fibers (polyurethane, etc.), polyvinyl chloride / polyvinyl alcohol copolymer fibers (polycral, etc.), polyalkylene paraoxybenzoate fibers (benzoate, etc.), polyfluoroethylene fibers (polytetrafluoroethylene, etc.), glass fibers, carbon fibers, alumina fibers, silicone carbide fibers, rock fibers (rock fibers), slag fibers (slag fibers), and metal fibers (gold thread, silver thread, 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 finishing quality, the fiber is preferably a fiber containing cotton fiber. From the viewpoint of finishing quality of the fiber, 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, and 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 cleaning the textile products with a cleaning liquid comprising a mixture of the powder detergent composition of the present invention and water (hereinafter referred to as the cleaning liquid of the present invention). 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 cleaning 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, from the viewpoint of washing performance, 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. The cleaning solution of the present invention may have a temperature 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 more, more preferably 10.0 or more, even more preferably 10.5 or more, and preferably 13.0 or less, more preferably 12.0 or less, even more preferably 11.0 or less. The pH is measured according to the pH measurement method described above for the powder detergent composition.

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

[0081] In the textile product 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 textile product with the cleaning liquid of the present invention) 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 damage to clothing.

[0082] The method for washing textile products of the present invention is suitable for a method of immersing textile products in a liquid used for scouring while sending the textile products with rollers or the like, and a rotary washing method. The rotary washing method means a washing method in which a textile product not fixed to a rotating device rotates around a rotating shaft together with the washing liquid. The rotary washing method can be carried out by 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 finish the textile products more beautifully. Specific examples of the rotary washing machine include drum washing machines, pulsator washing machines, and agitator washing machines. Each of these rotary washing machines can be commercially available for home use. In particular, the method for washing textile products of the present invention can be suitably used for a method for washing textile products using a drum washing machine, since it can suppress foam overflow in the washing tub.

[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 spin-drying, drying can be performed. Drying can be either natural drying or heat drying. Each drying can be performed multiple times. EXAMPLES

[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 moles of oxyethylene groups is 2 moles), component (a11), EMALE 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, Neoperex FS, manufactured by Kao Corporation, component (a12) C12EO10: Polyoxyethylene lauryl ether (average number of added moles of oxyethylene groups is 10 moles), 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] <Ingredient (b)> PC: Sodium percarbonate, 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 hydrogen carbonate, 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, 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 13000, PEG-13000, manufactured by Mitsui Chemicals, Inc.

[0087] <Other ingredients> Water: Ion-exchanged water CBS: Fluorescent whitening agent, Chinopal CBS, manufactured by Chiba Specialty Chemicals Savinase 8T: Enzyme (protease), manufactured by Novozymes Inc. 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 shown in the table are pure amounts. Components (a), (d), (f), (g), and (h) which 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 (b), (c), and (e) and other components were dry-mixed to obtain powder detergent compositions having the formulations shown in Table 1. The bulk density of each of the prepared powder detergent compositions measured by the method specified in JIS K 3362:2008 was 700 to 900 g / L, and the average particle size calculated from the mass fraction based on the size of the sieve mesh after vibrating for 5 minutes using a standard sieve of JIS Z 8801 was 300 μm. 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 stain having the following composition was prepared and used to produce an artificially soiled cloth containing the model sebum stain. Model sebum stain composition: 0.44% by mass of lauric acid, 3.15% by mass of myristic acid, 2.35% by mass of pentadecanoic acid, 6.31% by mass of palmitic acid, 0.44% by mass of heptadecanoic acid, 1.6% by mass of stearic acid, 7.91% by mass of oleic acid, 13.33% by mass of triolein, 2.22% by mass of n-hexadecyl palmitate, 6.66% by mass of squalene, and the remainder being water (total 100% by mass).

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

[0091] <Sebum stain cleaning test> The five model sebum-stained artificially contaminated cloths thus prepared were grouped into one set, and 1 L of 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). One set of the model sebum-stained artificially contaminated cloths was then added, and a cleaning test was performed under the following conditions. Washing 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 taken out of each set of model sebum-stained artificially soiled cloth, and the sebum cleansing rate was measured using the following method. The reflectance at 550 nm of the original cloth before contamination 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 of the four pieces was calculated. The results are shown in Table 1. Sebum cleaning rate (%) = 100 × [(reflectance of artificially soiled cloth after cleaning - reflectance of artificially soiled cloth before cleaning) / (reflectance of original cloth - reflectance of artificially soiled cloth before cleaning)]

[0093] [Yellowing bleaching power evaluation] <Preparation of model yellow stained artificially soiled cloth 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 made from the above composition was added to each 6 cm x 6 cm cotton / polyester broadcloth (cotton / polyester ratio = 35 / 65, purchased from Tanigashira Shoten) to prepare a model artificially soiled yellow stain.

[0094] <Yellowing stain bleaching test> The five model yellowing-stained artificially soiled cloths thus prepared were grouped into 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). One set of model sebum-stained artificially soiled cloths was then added, and a cleaning test was performed under the following conditions. Washing 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 yellowing stained artificially soiled cloths, and the yellowing bleaching rate was measured by the following method. The reflectance at 550 nm of the original cloth before soiling and the model yellowing artificially soiled cloth before and after washing was measured using a spectrophotometer (SE-2000, manufactured by Nippon Denshoku Co., Ltd.), and the yellowing bleaching rate (%) was calculated using the following formula, and the average value of 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] 4 kg of clothes and 30 g of each powder detergent composition shown in Table 1 were placed in a drum-type washing machine (Directr Drive (manufactured by LG)) and washed on a normal cycle. The washing tub was visually checked during washing, and a score of "good" was given if no foam overflowed from the washing tub, and a score of "poor" was given if foam overflowed from the washing 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); and 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)), in which the content of component (a11) in component (a) is 20 mass% or more (excluding component (c)). 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); and 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)), in which the content of component (a11) in component (a) is 20 mass% or more (excluding component (c)). 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 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. A powder detergent composition according to claim 1 or 2, 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 a 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 steps of: cleaning the textile products with a cleaning liquid comprising a mixture of the powder detergent composition according to claim 1 or 2 and water.