Powder detergent composition for clothing

Abstract

The present invention provides a powder detergent composition for clothing that has good cleaning power, produces little foam, and has good storage stability. [Solution] A powder detergent composition for clothing containing a chelating agent (A) and one or more (B) selected from the group consisting of aromatic sulfonic acid, aromatic carboxylic acid, and salts thereof (excluding surfactant (C)), wherein the composition does not contain surfactant (C) or contains it in an amount of 5% by mass or less, and the mass ratio of A / B is 0.1 to 5.0.

Description

Technical Field

[0001] The present invention relates to a laundry powder detergent composition.

Background Art

[0002] Common laundry detergents contain surfactants and require a rinsing step to prevent foam and surfactants from remaining on the laundry. Patent Document 1 relates to a laundry powder detergent containing a nonionic surfactant, and describes a method of granulating a mixture containing a nonionic surfactant and a specific hydrotrope to suppress the adhesion of residues of the nonionic surfactant to the washed clothes.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As an environmentally considerate technology, a laundry powder detergent with less foaming and reduced use of rinsing water is expected. In addition, for a powder detergent, it is required that the powder is difficult to get wet during storage (good storage stability). An object of the present invention is to provide a laundry powder detergent composition having good detergency, less foaming, and good storage stability.

Means for Solving the Problems

[0005] The present invention has the following aspects. <1> A laundry powder detergent composition containing the following component (A) and the following component (B), not containing the following component (C) or containing it in a content of 5% by mass or less, and having an A / B which represents the mass ratio of the content of component (A) to the content of component (B) of 0.1 to 5.0. (A) Ingredients: Chelating agent. (B) Component: One or more selected from the group consisting of aromatic sulfonic acids, aromatic carboxylic acids, and salts thereof (excluding component (C)). (C) Ingredients: Surfactants. <2> The aforementioned powder detergent composition for clothing contains particles (a) that contain component (A) and do not contain component (B), <1> The laundry powder detergent composition described above. <3> The aforementioned component (A) includes one or more selected from the group consisting of methylglycine diacetate, ethylenediaminetetraacetate, acrylic acid polymer salt, and acrylic acid maleic acid copolymer salt. <1> or <2> The laundry powder detergent composition described above. <4> The aforementioned component (B) includes one or more selected from the group consisting of toluenesulfonate, benzoate, and sulfobenzoate. <1> ~ <3> A laundry powder detergent composition according to any one of the items. [Effects of the Invention]

[0006] According to the present invention, a powder detergent composition for clothing is obtained that has good cleaning power, low foaming, and good storage stability. [Modes for carrying out the invention]

[0007] <<Powder detergent composition for clothing>> The laundry powder detergent composition of this embodiment (hereinafter sometimes simply referred to as the powder detergent composition) is a powder composition comprising components (A) and (B) as essential components. Component (C), which is a surfactant, does not need to be included, but may be included in small amounts. In this specification, a numerical range represented by "~" means a numerical range whose lower limit and upper limit are the numbers before and after "~".

[0008] <(A) component> Component (A) is a chelating agent. In this embodiment, component (A) contributes to the cleaning power. The powder detergent composition may contain one type of component (A) or two or more types. (A) Component is preferably one or more selected from the group consisting of aminocarboxylic acid-based chelating agents and polymer carboxylic acid-based chelating agents. As an aminocarboxylic acid-based chelating agent, aminocarboxylic acids or their salts, which are known as chelating agents, can be used. Aminocarboxylic acid salts are preferred. As a polymeric carboxylic acid-based chelating agent, polymeric carboxylic acids or salts thereof that are known as chelating agents can be used. Polymeric carboxylic acid salts are preferred.

[0009] Examples of aminocarboxylate salts include dihydroxyethylglycine salt, N-(2-hydroxyethyl)iminodiacetate, hydroxyethylethylenediaminetetraacetate, nitrilotriacetate, diethylenetriaminepentaacetate, hydroxyethylethylenediaminetriacetate, ethylenediaminetetraacetate (EDTA salt), methylglycine diacetate (MGDA salt), L-glutamic acid diacetate, aspartic acid diacetate, ethylenediamine succinate, and hydroxyiminodisuccinate. Examples of polymeric carboxylate salts include acrylic acid polymer salts and maleic acrylate copolymer salts. The mass-average molecular weight of the polymeric carboxylic acid is preferably, for example, 1,000 to 200,000, and more preferably 5,000 to 70,000. In this specification, the mass-average molecular weight of the polymeric carboxylic acid is measured by gel permeation chromatography using polyethylene glycol as a standard substance. Examples of salts include alkali metal salts such as sodium salts and potassium salts. Sodium salts are preferred.

[0010] Of the compounds listed above, component (A1), which is one or more selected from the group consisting of EDTA salts, MGDA salts, acrylic acid polymer salts, and acrylic acid maleic acid copolymer salts, is even more preferable in terms of its superior effect in improving cleaning power.

[0011] The content of component (A) relative to the total mass of the powder detergent composition is preferably 5 to 70% by mass, more preferably 7 to 5% by mass, and even more preferably 10 to 30% by mass. If the content of component (A) is above the lower limit, the cleaning power is further enhanced. If it is below the upper limit, the storage stability of the powder detergent composition is further enhanced. It is preferable that component (A) contains component (A1). The content of component (A1) relative to the total mass of component (A) may be 95% by mass or more, 96% by mass or more, 97% by mass or more, 98% by mass or more, 99% by mass or more, or 100% by mass.

[0012] <(B) component> Component (B) is one or more selected from the group consisting of aromatic sulfonic acids, aromatic carboxylic acids, and salts thereof. Component (B) does not contain a surfactant (component (C)). Component (B) contributes to improving the storage stability of the powder cleaning composition. (B) As component, aromatic sulfonic acids, aromatic carboxylic acids, and salts thereof, which are known as hydrotropes, can be used.

[0013] Examples of component (B) include toluenesulfonic acid (TS), xylenesulfonic acid (XS), cumenesulfonic acid (CS), benzenesulfonic acid, ethylbenzenesulfonic acid, naphthalenesulfone, 1,3-benzenedisulfonic acid, salicylic acid, benzoic acid, sulfobenzoic acid, and salts thereof. Toluenesulfonic acid may be o-toluenesulfonic acid, m-toluenesulfonic acid, or p-toluenesulfonic acid, with p-toluenesulfonic acid being preferred. Examples of salts include alkali metal salts such as sodium salts and potassium salts. Sodium salts are preferred.

[0014] Of these, toluenesulfonate, xylenesulfonate, cumenesulfonate, benzoate, and sulfobenzoate are preferred for their superior effect in improving storage stability. In particular, it is preferable that the (B) component contains one or more components selected from the group consisting of toluenesulfonates, benzoates, and sulfobenzoates.

[0015] With respect to the total mass of the powder detergent composition, the content of component (B) is preferably 10 to 70% by mass, more preferably 15 to 65% by mass, and still more preferably 20 to 60% by mass. When the content of component (B) is at least the above lower limit value, the storage stability of the powder washing composition is further enhanced. When it is at most the above upper limit value, the dust generation of the powder washing composition is more suppressed. With respect to the total mass of component (B), the content of the component (B1) may be 95% by mass or more, 96% by mass or more, 97% by mass or more, 98% by mass or more, 99% by mass or more, or 100% by mass.

[0016] <Content ratio> A / B representing the mass ratio of component (A) to the content of component (B) in the powder detergent composition is 0.1 to 5.0, preferably 0.12 to 3.0, and more preferably 0.15 to 2.3. When A / B is at least the lower limit value of the above range, the detergency is further enhanced, and when it is at most the upper limit value, the storage stability is further enhanced.

[0017] <Component (C)> Component (C) is a surfactant. Examples of the surfactant include known surfactants such as anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. In terms of excellent detergency improvement effect, anionic surfactants and nonionic surfactants are preferred. The component (C) contained in the powder detergent composition may be one kind or two or more kinds.

[0018] Examples of anionic surfactants include carboxylic acid-type anionic surfactants such as linear alkylbenzene sulfonic acid or its salt (LAS), α-olefin sulfonic acid or its salt (AOS), linear or branched alkyl sulfate ester or its salt (AS), polyoxyalkylene alkyl ether sulfate ester or its salt (AES), polyoxyalkylene alkenyl ether sulfate ester or its salt, alkyl group-containing alkane sulfonic acid or its salt, α-sulfo fatty acid ester or its salt (MES), internal olefin sulfonic acid or its salt (IOS), hydroxyalkane sulfonic acid or its salt, alkyl ether carboxylic acid or its salt, polyoxyalkylene ether carboxylic acid or its salt, alkylamide ether carboxylic acid or its salt, alkenylamide ether carboxylic acid or its salt, acylaminocarboxylic acid or its salt; and phosphate ester-type anionic surfactants such as alkyl phosphate ester or its salt, polyoxyalkylene alkyl phosphate ester or its salt, polyoxyalkylene alkylphenyl phosphate ester or its salt, glycerin fatty acid ester monophosphate ester or its salt. Examples of salt forms include alkali metal salts (sodium salts, potassium salts, etc.), alkaline earth metal salts (magnesium salts, etc.), and alkanolamine salts (monoethanolamine salts, diethanolamine salts, etc.).

[0019] Examples of nonionic surfactants include polyoxyalkylene-type nonionic surfactants, garbet alcohol-type nonionic surfactants, alkylphenols, alkylene oxide adducts of fatty acids having 8 to 22 carbon atoms or amines having 8 to 22 carbon atoms, polyoxyethylene polyoxypropylene block copolymers, fatty acid alkanolamides, polyhydric alcohol fatty acid esters or their alkylene oxide adducts, alkylene oxide adducts of hydrogenated castor oil, sugar fatty acid esters, N-alkyl polyhydroxy fatty acid amides, alkyl glycosides, and the like.

[0020] Adding component (C) to a powder detergent composition enhances its cleaning power. On the other hand, a lower content of component (C) reduces foam generation during the washing process. Reduced foaming means less rinsing time and less rinse water are needed. In other words, rinsability is improved. The powder detergent composition preferably does not contain component (C) or contains it in an amount of 5% by mass or less. If the powder detergent composition contains component (C), the content of component (C) is more than 0% by mass and 5% by mass or less, and preferably more than 0% by mass and 3% by mass or less, relative to the total mass of the powder detergent composition. If the powder detergent composition does not contain component (C), the content of component (C) is 0% by mass.

[0021] <Optional ingredients> The powder detergent composition may contain any components other than components (A) to (C). Optional ingredients can be any ingredients conventionally used in powder detergent compositions, such as inorganic salts, alkaline agents, enzymes, fragrances, color transfer inhibitors, oxidizing agents, dyes, fluorescent agents, re-soiling inhibitors, and disinfectants. One optional ingredient may be used, or two or more may be used in combination.

[0022] (Inorganic salts) Examples of inorganic salts include carbonates, sulfates, zeolites, and silicates. One inorganic salt may be used alone, or two or more may be used in combination. Examples of carbonates include sodium carbonate, sodium bicarbonate, potassium carbonate, and calcium carbonate. Among the carbonates, sodium carbonate and potassium carbonate are preferred, and sodium carbonate is more preferred, because they can enhance the cleaning power. The carbonate content of the powder detergent composition is preferably 1 to 50% by mass, more preferably 5 to 40% by mass, and even more preferably 10 to 30% by mass, relative to the total mass. If the carbonate content is above the lower limit, the cleaning power is further enhanced. If the carbonate content is below the upper limit, skin irritation during hand washing can be further suppressed.

[0023] Examples of sulfates include sodium sulfate, potassium sulfate, calcium sulfate, and magnesium sulfate. Sodium sulfate and potassium sulfate are preferred, and sodium sulfate is more preferred, due to their high solubility in water. The sulfate content of the powder detergent composition is preferably 1 to 60% by mass, more preferably 1 to 50% by mass, and even more preferably 1 to 40% by mass, relative to the total mass. If the sulfate content is above the lower limit, the fluidity of the powder detergent composition is further increased. If the sulfate content is below the upper limit, solubility at low water temperatures is improved.

[0024] Zeolite is a general term for crystalline aluminosilicates. Both crystalline and amorphous (amorphous) aluminosilicates can be used, but crystalline aluminosilicates (zeolites) are preferred from the viewpoint of cation exchange capacity, and A-type, X-type, Y-type, and P-type zeolites are preferred. The zeolite content of the powder detergent composition is preferably 0.1 to 10% by mass, and more preferably 1 to 5% by mass, relative to the total mass. If the zeolite content is above the lower limit, solidification of the powder detergent composition is further suppressed. If the zeolite content is below the upper limit, residue on clothes after washing is reduced.

[0025] Examples of silicates include alkali metal silicates such as sodium silicate and potassium silicate. The silicate content of the powder detergent composition is preferably 1 to 30% by mass, and more preferably 5 to 15% by mass, relative to the total mass. A silicate content above the lower limit enhances the cleaning power of the powder detergent composition. A silicate content below the upper limit enhances the storage stability of the powder detergent composition.

[0026] (enzyme) Examples of enzymes include proteases, amylases, lipases, cellulases, and mannanases. These enzymes may be used individually or in combination of two or more. The enzyme content is preferably 0.01 to 10% by mass relative to the total mass of the powder detergent composition.

[0027] (fragrance) Examples of fragrances (fragrance agents) include fragrance raw materials alone, or fragrance compositions consisting of fragrance raw materials, fragrance solvents, fragrance stabilizers, etc. Known fragrances can be incorporated into the powder detergent composition. The fragrance incorporated into the powder detergent composition may be in liquid form, particulate form, or encapsulated fragrance. One type of fragrance may be used alone, or two or more types may be used in combination. The fragrance content is preferably 0.01 to 5% by mass relative to the total mass of the powder detergent composition.

[0028] (Anti-transfer agent or anti-re-soiling agent) Examples of compounds used as anti-transfer agents or anti-redeposition agents include polysaccharide polymer compounds of carboxymethylcellulose (CMC), polyethylene glycol, polyvinyl alcohol polypyrrolidone, and vinylpyrrolidone / vinylimidazole copolymers. The anti-transfer agents or anti-redeposition agents may be used individually or in combination of two or more. The content of the anti-color transfer agent or anti-re-soiling agent relative to the total mass of the powder detergent composition is preferably 0.01 to 5% by mass.

[0029] (Oxidizing agent) Percarbonates can be used as oxidizing agents. One type of oxidizing agent may be used alone, or two or more types may be used in combination. As the percarbonate, sodium percarbonate may be used as is, or coated sodium percarbonate particles may be used, in which sodium percarbonate particles are coated. Using coated sodium percarbonate particles can improve the stability of sodium percarbonate during storage. Known coated sodium percarbonate particles can be used. For example, particles coated with silicic acid and / or silicates and boric acid and / or borates, or particles coated with a combination of inorganic compounds are preferred. Specifically, as described in Japanese Patent Publication No. 2918991, etc., particles coated by spraying with aqueous solutions of silicic acid and / or alkali metal silicates and aqueous solutions of boric acid and / or alkali metal borates, etc., as described in Japanese Patent Publication No. 2871298, etc., particles coated with aromatic hydrocarbon sulfonic acid and / or alkali silicates, carbonates, bicarbonates and sulfates, etc., with an average particle size of 10 to 500 μm, and particles coated with water-insoluble organic compounds such as paraffin and wax. To make them non-hazardous, coated sodium percarbonate particles may be used in powder blends with various inorganic substances such as sodium carbonate and sodium bicarbonate. Commercially available sodium percarbonate and coated sodium percarbonate particles can be used. For example, SPCC (Zhejiang Jinke Chemicals Co., Ltd.), Sodium Percarbonate (Zhejiang DC Chemical Co., Ltd.), PC-W (Nippon Peroxide), etc., are suitable examples. The content of the oxidizing agent relative to the total mass of the powder detergent composition is preferably 0.1 to 20% by mass, and more preferably 0.5 to 10% by mass. If the content of the oxidizing agent is above the lower limit, the cleaning power is increased, and if it is below the upper limit, the decomposition of the fragrance can be prevented.

[0030] (dye) Examples of colorants include quinone dyes, triphenylmethane dyes, azo dyes, xanthene dyes, quinoline dyes, and pyrene dyes. In this specification, "CI" is an abbreviation for color index. The structure of each pigment is described in the "Handbook of Legal Pigments" (compiled by the Japan Cosmetic Industry Association) and the "Dye Handbook" (compiled by the Society of Synthetic Organic Chemistry). The pigment may be used individually or in combination of two or more types.

[0031] Examples of quinone-based dyes include CISolvent Blue 63 (CI Solvent Blue 63, Blue No. 403), CISolvent Violet 13 (CI Solvent Violet 13, Violet No. 201), CIAcid Green 25 (CI Acid Green 25, Green No. 201), CIAcid Blue 112, CISolvent Green 3 (Green No. 202), CIVat Blue 6 (CI Bat Blue 6, Blue No. 204), CISolvent Blue 11, CISolvent Blue 12, CISolvent Blue 36, CIAcid Violet 43 (Violet No. 401), CIAcid Blue 41, CIAcid Blue 62, CIAcid Blue 78, CIDirect Green 28 (CI Direct Green 28), CIAcid Violet 34, CIAcid Violet 41, CIAcid Violet 51, CIAcid Blue 23, CIAcid Blue 25, CIAcid Blue 27, CIAcid Blue 40, CIAcid Blue 43, CIAcid Blue 45, CIAcid Blue 80, CIAcid Blue 126, CIAcid Blue 127, CIAcid Blue 129, CIAcid Blue 138, CIAcid Blue 143, CIAcid Blue 182, CIAcid Blue 183, CIAcid Blue 203, CIAcid Blue 204, CIAcid Blue 205, CIAcid Green 36, CIAcid Green 40, CIAcid Green 41, CIAcid Green 44, CIAcid Brown 27 (CI Acid Brown 27), CIAcid Black 48 (CI Acid Black 48), CIAcid Black 50, CIDisperse Red 9 (CI Disperse Red) 9)、CISolvent Violet 14、CIExamples include Disperse Violet 1 and CIAcid Green 27. Furthermore, for solvent-based (oil-soluble) dyes, chemical modification of the chromophore structure with water-soluble polymers such as polyethylene glycol or polypropylene glycol to increase water solubility is also acceptable. Specifically, examples include the trade names Liquitint Blue HP, Liquitint Blue BL, and Liquitint Blue MC from Milliken.

[0032] Examples of triphenylmethane-based dyes include Blue No. 1 (CI 42090) and Green No. 3 (CI 42053). Examples of azo dyes include Yellow No. 4 (CI 19140). Examples of xanthene pigments include Red 106 (CIAcid Red 52), Red 3 (CIAcid Red 51), Red 214 (CISolvent Red 49), Red 215 (CISolvent Red 49), Red 218 (CISolvent Red 48), Red 223 (CISolvent Red 43), Orange 201 (CISolvent Red 72), Orange 206 (CISolvent Red 73), Red 104 (1) (CIAcid Red 92), Red 105 (1) (CIAcid Red 94), Red 213 (CIBasic Violet 10), Red 230 (1) (CIAcid Red 87), Red 230 (2) (CIAcid Red 87), and Red 231 (CIAcid Red Examples include 92), Red 232 (CIAcid Red 94), Orange 207 (CIAcid Red 95), Yellow 201 (CIAcid Yellow 73), Yellow 202(1) (CIAcid Yellow 73), Yellow 202(2) (CIAcid Yellow 73), and Red 401 (CIAcid Violet 9). Here, "CI" is an abbreviation for "Color Index". Examples of quinoline-based dyes include Yellow 203 (CIAcid Yellow 3) and Yellow 204 (CISolvent Yellow 33). An example of a pyrene-based dye is Green 204 (CISolvent Green 7). The pigment content is preferably 0.1 to 100 ppm by mass relative to the total mass of the powder detergent composition.

[0033] (Fluorescent dye) Examples of fluorescent agents include biphenyl-type fluorescent agents such as 4,4'-bis(2-sulfostyryl)biphenyldisodium salt, and stilbene-type fluorescent agents such as 4,4'-bis((4-amino-6-morpholino-1,3,5-triazinyl-2)amino)stilbene-2,2'-disulfonate. These fluorescent agents may be used individually or in combination of two or more. The fluorescent agent content is preferably 0.001 to 5% by mass relative to the total mass of the powder detergent composition.

[0034] (Disinfectant) Examples of disinfectants include benzalkonium chloride, triclosan, isopropylmethylphenol, and trichlorohydroxydiphenyl. Disinfectants may be used individually or in combination of two or more. The disinfectant content of the powder detergent composition is preferably 0.05 to 3% by mass, and more preferably 0.05 to 1% by mass, relative to the total mass. A value above the lower limit of the above range enhances the bactericidal effect. A value below the upper limit enhances the stability of the powder detergent composition.

[0035] <Physical properties of powder detergent compositions> (Bulk density) The bulk density of the powder detergent composition is preferably 0.3 to 1.2 g / mL, and more preferably 0.5 to 1.0 g / mL. If the bulk density of the powder detergent composition is above the lower limit of the above range, it will not float easily on the water surface when dissolved in water, and its solubility will be higher. If it is below the upper limit, solidification under load will not easily occur. The method for measuring the bulk density of the powder detergent composition is the method described in the examples below.

[0036] (Angle of repose) The angle of repose of the powder detergent composition is preferably 0° to 60°, and more preferably 0° to 55°. If the angle of repose is within the above range, it can be determined that the powder detergent composition has good fluidity. The method for measuring the bulk density of the powder detergent composition is the method described in the examples below.

[0037] (Weight average particle size) The weight-average particle size of the powder detergent composition is preferably 50 to 1200 μm, more preferably 100 to 1000 μm, and even more preferably 150 to 700 μm. If the weight-average particle size is above the lower limit of the above range, dust generation suppression is further enhanced. If it is below the upper limit, solubility is further enhanced. The method for measuring the weight-average particle size of the powder detergent composition is the method described in the examples below.

[0038] (pH of aqueous solution) When using a powder detergent composition, wash the clothes using a cleaning solution obtained by dissolving the powder detergent composition in water. The pH of the aqueous solution obtained by dissolving 1.67 g of the powder detergent composition in 1000 mL of water with a hardness of 2°DH and a temperature of 25°C is preferably 9 to 11.5, and more preferably 10.0 to 11.0. If the pH of the aqueous solution is above the lower limit of the above range, the cleaning power will be further enhanced. If it is below the upper limit, skin irritation during hand washing can be further suppressed.

[0039] <Method for producing powder detergent composition> The powder detergent composition of the present invention can be manufactured by known methods for manufacturing powder detergents. For example, one method for producing a powder detergent composition may involve dry-mixing solid raw materials, then adding liquid raw materials while stirring the mixture, to produce the desired powder detergent composition. The solid raw material is preferably in particulate form. Particulate raw materials can be manufactured by known methods such as spray drying, known granulation methods (crushing granulation, agitation granulation, rolling granulation, fluidized bed granulation, etc.), or combinations thereof. They are also available commercially.

[0040] For dry mixing of solid raw materials, a trommel (rotating drum) can be used as a mixer. Examples of agitators used when adding liquid raw materials to a mixture of solid raw materials include trommels (rotating drums) and rotary sieves. The mixing time from the start of powder mixing to the end of liquid addition is preferably 15 seconds to 20 minutes, and more preferably 30 seconds to 10 minutes. If the mixing time is above the lower limit, the fluidity of the powder detergent composition can be further increased. If the mixing time is below the upper limit, the productivity of the powder detergent composition can be further increased.

[0041] When a powder detergent composition is manufactured by dry mixing two or more particulate raw materials and adding a liquid raw material as needed, a powder detergent composition is obtained in which particles of different types of raw materials (raw material particles) exist substantially as separate particles. The state of existing substantially as separate particles means that the raw material particles exist independently as separate particles, that multiple raw material particles aggregate to form secondary particles, or that these are mixed together. The liquid raw material added to the mixture obtained by dry mixing particulate raw materials may adhere to the surface of the raw material particles, and some or all of the liquid raw material may be absorbed into (impregnated) the raw material particles.

[0042] [Particle (a)] (A) The raw material for component (A) is preferably in particulate form. It is preferable to use particles (a) that contain component (A) but do not contain component (B) as the raw material particles for component (A). The weight-average particle diameter of particle (a) is preferably 40 to 1200 μm, more preferably 200 to 1000 μm, and even more preferably 300 to 700 μm. If the weight-average particle diameter of particle (a) is above the lower limit of the above range, the hygroscopicity is not too high, and good storage stability of the powder washing composition is easily obtained. If it is below the upper limit, good solubility is obtained. The method for measuring the weight-average particle diameter of particle (a) is the same as the method for measuring the weight-average particle diameter of the powder detergent composition.

[0043] Particle (a) can be manufactured by known methods. Particle (a) is also available commercially. Particle (a) may contain, in addition to component (A), a particulating component used to form the particulate material. The content (pure content) of component (A) relative to particle (a) is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more.

[0044] While using particles (a) as a raw material for component (A) makes the raw material easy to manufacture or obtain, particles (a) are prone to hygroscopicity, which can reduce the storage stability of the powder detergent composition. By including particles (a) and component (B) in the powder detergent composition, the storage stability of the powder detergent composition can be improved. It is preferable for the powder detergent composition to contain particles (a) because the effect of improving storage stability by using component (B) is greater.

[0045] [Particle (b)] (B) The raw material for component (B) is preferably in particulate form. It is preferable to use particles (b) that contain component (B) but do not contain component (A) as the raw material particles for component (B). The weight-average particle diameter of particle (b) is preferably 10 to 500 μm, more preferably 25 to 400 μm, and even more preferably 50 to 300 μm. If the weight-average particle diameter of particle (b) is above the lower limit of the above range, dust generation can be suppressed. If it is below the upper limit, solidification properties are good. The method for measuring the weight-average particle diameter of particle (b) is the same as the method for measuring the weight-average particle diameter of the powder detergent composition.

[0046] Particle (b) can be manufactured by known methods. Particle (b) is also available commercially. Particle (b) may contain, in addition to component (B), a particulating component used to form the particulate material. The content (pure content) of component (B) relative to particle (b) is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more.

[0047] [Particle (c)] (C) The raw material for component (C) is preferably in particulate form. It is preferable to use particles (c) that contain component (C) but do not contain either component (A) or component (B) as raw material particles for component (C). The weight-average particle diameter of particle (c) is preferably 100 to 1000 μm, more preferably 150 to 700 μm, and even more preferably 200 to 500 μm. If the weight-average particle diameter of particle (c) is above the lower limit of the above range, the fluidity will be good. If it is below the upper limit, the solubility will be good. The method for measuring the weight-average particle diameter of particle (c) is the same as the method for measuring the weight-average particle diameter of the powder detergent composition.

[0048] Particle (c) can be manufactured by known methods. Particle (c) is also available commercially. Particle (c) may contain, in addition to component (C), particulating components used to form the particulate material. The content (pure content) of component (C) relative to particle (c) is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more.

[0049] [Particles of arbitrary components] The raw materials for optional components may be in particulate or liquid form. For example, inorganic salts, alkaline agents, enzymes, color transfer inhibitors, oxidizing agents, fluorescent agents, re-soiling inhibitors, and disinfectants are each preferably in particulate form. Dyes may be in particulate or liquid form. Fragrances are preferably in liquid form. The weight-average particle size of each optional component is preferably 50 to 2000 μm, more preferably 100 to 1000 μm, and even more preferably 150 to 700 μm. If the weight-average particle size of the optional component is above the lower limit of the above range, the fluidity will be good. If it is below the upper limit, the solubility will be good. The method for measuring the weight-average particle diameter of any component is the same as the method for measuring the weight-average particle diameter of a powder detergent composition. The particles of the optional components can be manufactured by known methods and are also available commercially. They may contain particulating components used to form the particles. The purity of the particles of each optional component is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 70% by mass or more.

[0050] Furthermore, if particle (a), particle (b), or any particle of an arbitrary component contains a small amount of surfactant as a particulating component (for example, 10% by mass or less relative to the particle mass), the surfactant in these particles shall not be included in component (C). The surfactant content relative to the particle mass may be 10% by mass or less, 9% by mass or less, 8% by mass or less, 7% by mass or less, 6% by mass or less, 5% by mass or less, 4% by mass or less, 3% by mass or less, 2% by mass or less, or 1% by mass or less.

[0051] Preferred embodiments of the powder detergent composition include the following embodiments (1) and (2). Embodiment (1): An embodiment in which the raw materials of a powder detergent composition include particle (a) and particle (b), but do not include particle (c). In this embodiment, a powder detergent composition is obtained in which particle (a) and particle (b) exist as substantially separate particles. Embodiment (2): Embodiment in which the raw materials of the powder detergent composition include particle (a), particle (b), and particle (c). In this embodiment, a powder detergent composition is obtained that includes particle (a), particle (b), and particle (c), wherein particle (a), particle (b), and particle (c) exist as substantially separate particles.

[0052] <Application> The powder detergent composition of this embodiment has excellent sebum stain removal power and is suitable as a powder detergent composition for clothing. In this specification, clothing refers to textile products that frequently come into contact with the skin, and includes, for example, dress shirts, T-shirts, polo shirts, blouses, chinos, slacks, skirts, sweaters, scarves, jeans, pajamas, underwear, tights, and socks. In addition, it may be used for cleaning fabric products such as cushion covers, seat cushion covers, sofa covers, pillowcases, duvet covers, sheets, bedspreads, blankets, handkerchiefs, and towels; mats for toilets, entrances, and bathrooms; and carpets, rugs, etc.

[0053] <How to use> One method of using the powder detergent composition is to add the powder detergent composition alone or together with known components (e.g., bleach, fabric softener, etc.) to water to make a cleaning solution, and then add the items to be washed to this cleaning solution and wash them in a washing machine or the like. The content of the powder detergent composition relative to the total mass of the cleaning solution is preferably, for example, 300 to 5000 ppm by mass, and more preferably 500 to 2000 ppm by mass.

[0054] The powder detergent composition of this embodiment suppresses foaming during the washing process and has excellent foam rinsing properties. Therefore, the items to be washed can be washed without a rinsing step. A method for washing items without a rinsing step (a zero-rinse washing method) includes a washing step in which a washing solution is brought into contact with the items, a dehydration step in which the items are dehydrated after the washing step, and a drying step in which the items are dried without rinsing after the dehydration step. [Examples]

[0055] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following description.

[0056] ≪Measurement Methods and Evaluation Methods≫ <Method for measuring bulk density> A sample of powder (sample) arbitrarily taken from the powder detergent composition was gently filled to the brim into a cylindrical stainless steel cup (1L volume) with a diameter of 110mm and a height of 110mm. The sample was leveled with a glass rod so that the top surface was horizontal, and the weight of the sample in the cup was measured on a balance to calculate the bulk density (g / mL). The same procedure was repeated, and the average value of five measurements was taken as the bulk density value.

[0057] <Method for measuring the angle of repose> First, an acrylic resin measuring instrument (10 cm high x 10 cm deep x 3 cm wide) with angle markings was placed on a level surface. With the side cover of the instrument closed, the powdered cleaning agent composition was poured in from 50 mm above the instrument. After the powdered cleaning agent composition had risen 0-1 cm above the top of the instrument and was piled high, the side cover was gently opened to allow the powdered cleaning agent composition to drain naturally. After the draining was complete, the angle (in degrees) between the surface of the powdered cleaning agent composition remaining in the instrument and the horizontal surface was read from the scale on the side of the instrument. This operation was repeated three times, and the average of the above angles was taken as the angle of repose.

[0058] <Method for measuring weight-average particle diameter> The weight-average particle size of the powder detergent composition was measured using a sieving method. Classification was performed using eight sieves and trays with mesh sizes of 1410 μm, 1190 μm, 1000 μm, 710 μm, 500 μm, 350 μm, 250 μm, and 149 μm. In the classification operation, the sieves were stacked on the tray in order from the smallest mesh size to the largest mesh size, and approximately 50 g of sample (powder detergent composition) was placed on top of the 1410 μm sieve and sieved. The sample remaining on each sieve and tray was then collected according to the sieve size. By repeating this operation, classification samples of particle sizes 1410 μm~ (1410 μm on), 1190~1410 μm (1190 μm on), 1000~1190 μm (1000 μm on), 710~1000 μm (710 μm on), 500~710 μm (500 μm on), 350~500 μm (350 μm on), 250~350 μm (250 μm on), 149~250 μm (149 μm on), and plate~149 μm (149 μm pass) were obtained, and their weight frequencies (%) were calculated. Next, let X be the mesh size of sieves with mesh sizes of 500 μm, 350 μm, 250 μm, or 150 μm, and let Y be the cumulative weight frequency on each sieve. The 50% weight diameter was calculated from the least-squares approximation line obtained by plotting log·log(100 / Y) against logX, and this was taken as the weight-average particle diameter.

[0059] <Method for measuring the pH of an aqueous solution> 1.67 g of the powdered detergent composition was taken, 1000 mL of 2°DH water (temperature adjusted to 25°C) was poured over it, and the pH was measured using a glass electrode pH meter (manufactured by Toa DKK, product name: GST-5721C).

[0060] <Method for evaluating cleaning power> As the soiled cloth, a wet artificial soiled cloth (manufactured by the Japan Laundry Science Association, containing 28.3% oleic acid, 15.6% triolein, 12.2% cholesterol oleate, 2.5% liquid paraffin, 2.5% squalene, 1.6% cholesterol, 7.0% gelatin, 29.8% mud, and 0.5% carbon black, with sebum stains attached) was cut into 5cm x 5cm pieces. A terg-O-tometer (manufactured by UNITED STATES TESTING) was used as the washing test apparatus. As the washing solution, each powder detergent composition was dissolved in 900 mL of water at 25°C and 2°DH to a concentration of 1667 ppm (by mass) and used. A colorimeter (manufactured by Nippon Denshoku Industries, Ltd., product name: SE-7700) was used to measure the reflectance of 10 soiled cloths before washing (calculated using Hunter whiteness Z as reflectance R = Z / 100; the same method was used hereafter). Ten soiled cloths and a charge cloth (knitted cloth cut into small pieces, thoroughly washed and rinsed, and dried) were weighed to a predetermined bath ratio (30 times) and placed in the washing tank of the washing tester, and then the washing solution was added to the washing tank. After washing at a rotation speed of 120 rpm and a temperature of 25°C for 10 minutes, two rinses were performed with 900 mL of 25°C tap water for 3 minutes each. After rinsing and drying, the reflectance of the soiled cloths after washing was measured using a 460 nm filter, and the washing rate was calculated using the following formula (i). Cleaning rate (%) = (K / S of soiled cloth - K / S of cleaned cloth) / (K / S of soiled cloth - K / S of unsoiled cloth) × 100 ... (i) (In equation (i), K / S is (1-R / 100) 2 The formula is / (2R / 100), where "contaminated cloth" refers to the artificially contaminated cloth, "washed cloth" refers to the cloth after washing the contaminated cloth, and "uncontaminated cloth" refers to the original white cloth (raw cloth) without any stains. K represents the absorption coefficient, S represents the scattering coefficient, and R represents the absolute reflectance. Based on the obtained cleaning rate, the cleaning power of sebum stains was evaluated according to the following evaluation criteria. [Evaluation Criteria] ◎: The average cleaning rate of 10 soiled cloths is 85% or higher (pass). ○: The average cleaning rate of 10 soiled cloths was between 70% and 85% (pass). ×: The average cleaning rate of the 10 soiled cloths was less than 70% (failure).

[0061] <Method for evaluating storage stability> 20 g of the powdered detergent composition was placed in a plastic balance dish and left to stand at room temperature (25°C) for 6 hours without sealing. Afterward, the appearance of the powder surface was visually inspected, and fluidity was confirmed by vibrating the balance dish. Storage stability was evaluated according to the evaluation criteria below. [Evaluation Criteria] ◎: The powder surface is not wet and is fluid (pass) ○: The powder surface is not wet, but it is not fluid (Pass) ×: The surface of the powder is wet (failure)

[0062] <Method for evaluating foam suppression (rinsing ability)> A washing solution was prepared by dissolving 1.67 g of the powdered washing agent composition in 1000 mL of water at 25°C and 2°DH. 10 mL of the washing solution was placed in a transparent Epton tube (capacity 100 mL, body diameter 25 mm), and the Epton tube was shaken by hand 20 times at a rate of 1 stroke / second. The foam height (height from the boundary between the foam and the washing solution to the top surface of the foam) was read one minute after the end of shaking, and the foam suppression performance was evaluated according to the evaluation criteria below. A lower foam height indicates less foaming and better rinsing performance. ◎: The foam height is less than 1 cm (pass). ○: The bubble height is 1 cm or more and less than 5 cm (pass). ×: The foam is more than 5cm high (fail).

[0063] ≪Raw materials used≫ <(A) component (particle (a))> Particle (a1): Sodium acrylate maleate copolymer, trade name "Sokalan CP5", manufactured by BASF, Mw 70000, weight-average particle size 520 μm, purity 92% by mass. Particles (a2): Sodium acrylate polymer salt, trade name "Sokalan PA30 CL Granule", manufactured by BASF, Mw 8000, weight-average particle size: 512 μm, purity 92% by mass. Particles (a3): Sodium acrylate polymer salt, trade name "Sokalan PA25 CL Granule", manufactured by BASF, Mw 4000, weight-average particle size: 475 μm, purity 92% by mass. Particles (a4): Trisodium methylglycine diacetate, trade name "Trilon M Powder", manufactured by BASF, weight-average particle size: 901 μm, purity 80% by mass. Particles (a5): Ethylenediaminetetraacetate tetrasodium, trade name "Trilon BX Powder", manufactured by BASF, weight-average particle size 45 μm, purity 86%. Particles (a1) to (a5) do not contain component (B).

[0064] <(B) component (particle (b))> Particles (b1): Sodium p-toluenesulfonate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., weight-average particle size 306 μm, purity 85% by mass. Particles (b2): Sodium benzoate, manufactured by Fujifilm Wako Pure Chemical Industries. Weight-average particle size 1344 μm, purity 99% by mass. Particles (b3): ​​Sodium m-sulfobenzoate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Weight-average particle size 10 μm or less, purity 96% by mass. Particles (b1) to (b3) do not contain component (A).

[0065] <(C) component (particle (c))> Particles (c1): Sodium lauryl sulfate, anionic surfactant (AS), trade name "Sodium Dodecyl Sulfate", manufactured by Tokyo Chemical Industry Co., Ltd., weight-average particle size 330 μm, purity 96% by mass. Particle (c1) does not contain component (A) or component (B).

[0066] <Optional ingredients> [Particulate] Sodium carbonate: Sodium carbonate, manufactured by Dahuachem, weight-average particle size 353 μm, purity 99% by mass. Sodium sulfate: Sodium sulfate, manufactured by Shikoku Chemicals Co., Ltd., weight-average particle size 282 μm, purity 99% by mass. Zeolite: Manufactured by Thai Silicate Chemicals, weight-average particle size 10 μm or less, purity 80% by mass. Enzyme: Protease, trade name "DeozymeII", manufactured by Novonesis, weight-average particle size 1430 μm, purity 100% by mass. Sodium percarbonate: Sodium percarbonate manufactured by Jiangxi Yongtai Chemical Co., Ltd., weight-average particle size 634 μm, purity 100% by mass. Anti-transfer agent: Vinylpyrrolidone / vinylimidazole copolymer, trade name "Sokalan HP56 Granule", manufactured by BASF Japan, weight-average particle size 390 μm, purity 97% by mass. [Liquid] Fragrance: Product name "White Fantasy", Takasago company.

[0067] <Examples 1-13, Comparative Examples 1-5> Powder detergent compositions were prepared using the formulations shown in Tables 1-3. First, the particulate raw materials other than the fragrance from the raw materials shown in the table were dry-mixed in a 400 x 600 mm plastic bag, and then the fragrance was sprayed while stirring with a small trommel to obtain a powder detergent composition. The table shows the content (in mass %) of component (A), component (B), and component (C) relative to the total mass of the powder detergent composition, as well as the mass ratio of A / B, calculated from the purity and blending amount of particulate raw materials. Components whose blending amount is not listed in the table are not included. The bulk density, angle of repose, weight-average particle size, and pH of the aqueous solution of the obtained powder detergent composition were measured using the method described above. The results are shown in the table. For each example of the powder detergent composition, the cleaning power, storage stability, and foam suppression (rinsability) were evaluated using the method described above. The results are shown in the table.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] As shown in Tables 1 and 2, the powder detergent compositions of Examples 1 to 13 exhibited good cleaning power despite containing only a small amount or none of component (C), excellent foam suppression (rinsability), and good storage stability despite containing particle (a). Reducing surfactants in this way leads to a reduction in rinse water, a reduction in CO2 emissions, and decarbonization of raw materials.

[0072] As shown in Table 3, Comparative Example 1, which contained no component (A) and a large amount of component (C), had good cleaning power and storage stability, but poor foam suppression. Comparative Examples 2 and 3, which did not contain component (B), showed good cleaning power and foam suppression, but had poor storage stability. Comparative Example 4, with a small A / B ratio, had inferior cleaning power, while Comparative Example 5, with a large A / B ratio, had inferior storage stability.

Claims

1. It contains the following components (A) and (B), and does not contain the following component (C), or contains it in an amount of 5% by mass or less. A powder detergent composition for clothing, wherein the A / B ratio, which represents the mass ratio of the content of component (A) to the content of component (B), is 0.1 to 5.

0. (A) Ingredients: Chelating agent. (B) Component: One or more selected from the group consisting of aromatic sulfonic acids, aromatic carboxylic acids, and salts thereof (excluding component (C)). (C) Ingredients: Surfactant.

2. The powder laundry detergent composition according to claim 1, wherein the powder laundry detergent composition contains particles (a) that contain component (A) and do not contain component (B).

3. The powder detergent composition for clothing according to claim 1 or 2, wherein the component (A) comprises one or more selected from the group consisting of methylglycine diacetate, ethylenediaminetetraacetate, acrylic acid polymer salt, and acrylic acid maleic acid copolymer salt.

4. The powder detergent composition for clothing according to claim 1 or 2, wherein the component (B) comprises one or more selected from the group consisting of toluenesulfonate, benzoate, and sulfobenzoate.

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