Detergent composition for laundry

Abstract

To provide a detergent composition for laundry that prevents discoloration and exhibits excellent detergency.SOLUTION: A detergent composition for laundry comprises: a component (A): a water-soluble silver compound and a component (B): an α-sulfo fatty acid ester salt represented by the following general formula (b1), wherein the content of the component (A) is 1 mass% or less and the content of the component (B) is 0.2-4.5 mass% relative to the total mass of the detergent composition for laundry. R1CH(SO3M)COOR2 (b1) [In formula (b1), R1 denotes a hydrocarbon group having 10-16 carbon atoms, R2 denotes a hydrocarbon group having 1-6 carbon atoms, and M denotes a counterion].SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a laundry detergent composition comprising component (A): a water-soluble silver compound; and component (B): an α-sulfofatty acid ester salt. [Background technology]

[0002] Following the COVID-19 pandemic, there has been an increased need for hygiene-related detergents for clothing, including antibacterial and antiviral properties. While consumers place importance on "hygiene," in recent years, chemical hygiene appeals have been perceived as harsh, giving a negative impression on the human body and clothing. Therefore, there is a demand for laundry detergents that combine antibacterial and antiviral properties with a hygienic and safe base, as well as cleaning properties, which are the basic function of detergents.

[0003] Patent Document 1 proposes a laundry detergent composition that contains an α-sulfofatty acid ester salt as an anionic surfactant and has excellent detergency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-149936 A

[0005] Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 1, the clothing detergent composition containing an α-sulfofatty acid ester salt exhibits high detergency but is insufficient in terms of sterilizing performance.

[0007] In view of the above circumstances, the present invention provides a laundry detergent composition with high detergency, which employs a water-soluble silver compound as a hygienic and safe disinfectant in order to enhance disinfecting performance for removing mold, bacteria, etc. Furthermore, when a water-soluble silver compound is employed, it reacts with impurities derived from the detergent raw materials and discolors, so that it is necessary to suppress discoloration. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention employs the following configuration. [1] A clothing detergent composition comprising: (A) component: a water-soluble silver compound; and (B) component: an α-sulfofatty acid ester salt represented by the following general formula (b1), wherein the content of the component (A) is 1 mass % or less, and the content of the component (B) is 0.2 to 4.5 mass %, relative to the total mass of the clothing detergent composition: R 1 CH(SO3M)COOR 2 (b1) [In formula (b1), R 1 is a hydrocarbon group having 10 to 16 carbon atoms, and R 2 is a hydrocarbon group having 1 to 6 carbon atoms, and M is a counter ion. [2] The clothing detergent composition according to [1], wherein the component (A) is at least one selected from silver oxide and silver nitrate. [3] The clothing detergent composition according to [1] or [2], which is a powder. Effect of the Invention

[0009] According to the clothing detergent composition of the present invention, it is possible to provide a clothing detergent composition which suppresses discoloration and has excellent detergency. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Clothing detergent composition] The clothing detergent composition of the present invention (hereinafter also simply referred to as "detergent composition") contains the following components (A) and (B).

[0011] [Component (A)] Component (A) is a water-soluble silver compound. In this specification, the term "water-soluble silver compound" refers to a silver compound having a solubility in water at 25°C of 0.01 mg / L or more.

[0012] The component (A) is not particularly limited in type as long as it has the above solubility and releases silver ions in water. Examples of water-soluble silver compounds include silver sulfate, silver nitrate, silver acetate, silver oxide, silver sulfide, silver fluoride, silver chloride, silver bromide, silver iodide, and silver perchlorate. From the viewpoint of solubility in water, silver nitrate, silver oxide, and silver chloride are preferred.

[0013] The solubility of the water-soluble silver compound in water at 25° C. is preferably 0.01 mg / L or more, more preferably 1 mg / L or more, and particularly preferably 10 mg / L or more, from the viewpoint of preventing precipitation.

[0014] The content of the water-soluble silver compound is preferably 0.0001 to 1 mass%, more preferably 0.001 to 0.5 mass%, and particularly preferably 0.001 to 0.1 mass%, based on the total mass of the cleaning composition. When the content of the water-soluble silver compound is equal to or more than the lower limit, the cleaning composition has excellent disinfecting and antibacterial properties. When the content of the water-soluble silver compound is equal to or less than the upper limit, the cleaning composition has excellent discoloration suppression properties.

[0015] From the viewpoint of disinfecting performance and antibacterial performance, the water-soluble silver compound preferably contains silver ions at 0.000001 mass % (0.01 ppm by mass) or more in the treatment liquid (washing water) containing the detergent composition, more preferably 0.000005 mass % or more, and particularly preferably 0.00001 mass % or more.

[0016] [(B) Component] The component (B) is an α-sulfofatty acid ester salt represented by the following general formula (b1). R 1 CH(SO3M)COOR 2 (b1) [In formula (b1), R 1is a hydrocarbon group having 10 to 16 carbon atoms, and R 2 is a hydrocarbon group having 1 to 6 carbon atoms, and M is a counter ion.

[0017] (b1) In the formula, R 1 The hydrocarbon group may be linear or branched, or may contain a cyclic structure. 1 The hydrocarbon group is preferably an aliphatic hydrocarbon group, and may be linear or is preferably a branched alkyl group or a linear or branched alkenyl group, more preferably a linear An alkyl group or a linear alkenyl group is more preferred. 1 has 10 to 16 carbon atoms, preferably 12 to 16, and more preferably 14 to 16.

[0018] (b1) In the formula, R 2 The hydrocarbon group may be linear or branched, or may contain a cyclic structure. 2 The hydrocarbon group of R is preferably an aliphatic hydrocarbon group, more preferably a linear or branched alkyl group or a linear or branched alkenyl group, and further preferably a linear alkyl group or a linear alkenyl group. 2 has 1 to 6 carbon atoms, and preferably 1 to 3 carbon atoms. R 2 Examples of the hydrocarbon group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, and the like. From the viewpoint of improving cleaning properties, methyl, ethyl and n-propyl groups are preferred. A methyl group is preferred, and a methyl group is more preferred.

[0019] In formula (b1), M is a counter ion, and R 1 CH(COOR 2 )Soluble with SO3- The counter ion may be an alkali metal ion, a proton ion, or a phosphate ion. Examples of suitable cations include cationized amines and ammonium. Examples of the alkali metal that can serve as the counter ion include sodium and potassium. The amine that can be the counter ion may be any of primary, secondary and tertiary amines having a total carbon number of 1 to 6. The amine may have a hydroxy group, and is preferably ) the presence of a hydroxyl group increases the solubility of the cleaning agent in water. Such amines include alkanolamines, and the alkano The number of carbon atoms in the alkanol group is preferably 1 to 3. As the alkanolamine, monoethanolamine is preferable. Among them, M is preferably: Alkali metal ions are preferred.

[0020] The content of the α-sulfo fatty acid ester salt is preferably 0.1 to 4.5 mass%, more preferably 0.2 to 3 mass%, and particularly preferably 0.5 to 1 mass%, based on the total mass of the detergent composition. When the content of the α-sulfo fatty acid ester salt is equal to or more than the above lower limit, the cleaning power is excellent. When the content of the α-sulfo fatty acid ester salt is equal to or less than the above upper limit, the discoloration inhibition is excellent.

[0021] The α-sulfofatty acid ester salts are produced by a conventionally known production method. The method for producing the fatty acid ester salt is described, for example, in JP-A-2011-121996. The manufacturing method includes:

[0022] [Optional ingredients] Optional components include surfactant-containing particles, percarbonates, enzymes, fragrances, etc. The surfactant-containing particles are particles containing a surfactant, an inorganic salt, etc., and are obtained by spray drying. Examples of the surfactant include known surfactants such as anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. From the viewpoint of further enhancing the cleaning power, the surfactant is preferably anionic surfactants or nonionic surfactants, and more preferably anionic surfactants. The surfactant may be used alone or in combination of two or more kinds.

[0023] Examples of anionic surfactants include the following: (1) Linear or branched alkylbenzene sulfonate having an alkyl group having 8 to 18 carbon atoms (LAS or ABS). (2) Alkanesulfonates having 10 to 20 carbon atoms. (3) α-olefin sulfonates (AOS) having 10 to 20 carbon atoms. (4) Alkyl sulfates or alkenyl sulfates (AS) having 10 to 20 carbon atoms. (5) Alkyl (or alkenyl) ether sulfates (AES) having a linear or branched alkyl (or alkenyl) group having 10 to 20 carbon atoms, which is obtained by adding an average of 0.5 to 10 moles of any alkylene oxide having 2 to 4 carbon atoms, or ethylene oxide and propylene oxide (molar ratio EO / PO=0.1 / 9.9 to 9.9 / 0.1). (6) Alkyl (or alkenyl) phenyl ether sulfate having a linear or branched alkyl (or alkenyl) group having 10 to 20 carbon atoms, which is obtained by adding an average of 3 to 30 moles of any alkylene oxide having 2 to 4 carbon atoms, or ethylene oxide and propylene oxide (molar ratio EO / PO=0.1 / 9.9 to 9.9 / 0.1). (7) Alkyl (or alkenyl) ether carboxylate having a linear or branched alkyl (or alkenyl) group having 10 to 20 carbon atoms, which is obtained by adding an average of 0.5 to 10 moles of any alkylene oxide having 2 to 4 carbon atoms, or ethylene oxide and propylene oxide (molar ratio EO / PO=0.1 / 9.9 to 9.9 / 0.1). (8) Alkyl polyhydric alcohol ether sulfates, such as alkyl glyceryl ether sulfonic acids having 10 to 20 carbon atoms. (9) Long chain monoalkyl, dialkyl or sesquialkyl phosphates. (10) Polyoxyethylene monoalkyl, dialkyl or sesquialkyl phosphates. (11) Soap. The soap may be an alkali metal salt, more preferably a sodium or potassium salt, of a higher fatty acid having an average carbon number of 10 to 20, preferably 12 to 18. The alkyl group of the fatty acid is preferably primary. The soap may be one having a single chain length or a mixture of two or more chain lengths. Examples of the salt of the anionic surfactant include alkali metal salts such as sodium and potassium salts, amine salts, and ammonium salts. As the anionic surfactant, a linear or branched alkylbenzenesulfonate having an alkyl group having 8 to 18 carbon atoms is preferred.

[0024] Examples of nonionic surfactants include the following: (1) Polyoxyalkylene alkyl (or alkenyl) ether (AE) obtained by adding an average of 3 to 30 moles, preferably 3 to 20 moles, and more preferably 5 to 20 moles of an alkylene oxide having 2 to 4 carbon atoms to an aliphatic alcohol having 6 to 22 carbon atoms, preferably 8 to 18 carbon atoms. (2) Polyoxyethylene alkyl (or alkenyl) phenyl ether. (3) Fatty acid alkyl ester alkoxylates in which alkylene oxide is added between the ester bonds of long-chain fatty acid alkyl esters. (4) Polyoxyethylene sorbitan fatty acid esters. (5) Polyoxyethylene sorbitol fatty acid ester. (6) Polyoxyethylene fatty acid esters. (7) Polyoxyethylene hydrogenated castor oil. (8) Glycerol fatty acid ester.

[0025] The content of the surfactant is preferably 1 to 35% by mass, more preferably 5 to 30% by mass, and even more preferably 10 to 25% by mass, based on the total mass of the surfactant-containing particles. When the content of the surfactant is equal to or more than the lower limit, the cleaning power is excellent. When the content of the surfactant is equal to or less than the upper limit, the flowability of the cleaning composition can be improved.

[0026] Examples of inorganic salts include carbonates and sulfates. Examples of carbonates include sodium carbonate, sodium bicarbonate, potassium carbonate, calcium carbonate, etc. Examples of sulfates include sodium sulfate, potassium sulfate, calcium sulfate, magnesium sulfate, etc. Examples of carbonates include sodium carbonate and potassium carbonate, which can further increase the cleaning power, and sodium carbonate is more preferable. Examples of sulfates include sodium sulfate and potassium sulfate, which have high solubility in water, and sodium sulfate is more preferable. One type of inorganic salt may be used alone, or two or more types may be used in combination.

[0027] The content of the carbonate is preferably 1 to 50 mass%, more preferably 2 to 40 mass%, and even more preferably 2 to 30 mass%, based on the total mass of the surfactant-containing particles. When the content of the carbonate is equal to or more than the lower limit, the solubility of the detergent composition can be improved. When the content of the carbonate is equal to or less than the upper limit, rough hands during hand washing can be further suppressed.

[0028] The content of the sulfate is preferably 10 to 70 mass%, more preferably 15 to 60 mass%, and even more preferably 20 to 55 mass%, based on the total mass of the surfactant-containing particles. When the content of the sulfate is equal to or more than the lower limit, the cleaning power can be improved. When the content of the sulfate is equal to or less than the upper limit, the solubility of the surfactant particles at low temperatures can be improved.

[0029] Other inorganic salts are granular inorganic salts other than carbonates and sulfates. Examples include zeolite and silicates of alkali metals. Zeolite is a general term for crystalline aluminosilicates. As the aluminosilicates, either crystalline or amorphous (amorphous) can be used, but crystalline aluminosilicates (zeolites) are preferred from the viewpoint of cation exchange capacity, and A-type, X-type, Y-type, P-type zeolites, etc. are suitable. Examples of silicates of alkali metals include sodium silicate and potassium silicate, etc.

[0030] The surfactant-containing particles may contain components other than the surfactant and inorganic salt (hereinafter, also referred to as "other components"). Examples of the other components include the optional components described above, as well as thickening polymers, fluorescent agents, chelating agents, dispersants, pigments, etc.

[0031] Examples of the thickening polymer include polysaccharide-based polymer compounds such as carboxymethyl cellulose (CMC), and acrylic acid-based polymer compounds such as acrylic acid-maleic anhydride copolymer sodium salt (MA agent).

[0032] Examples of fluorescent agents include biphenyl-type fluorescent agents such as 4,4'-bis(2-sulfostyryl)biphenyl disodium 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.

[0033] The chelating agent includes at least one compound selected from aminocarboxylic acid or a salt thereof, and hydroxycarboxylic acid or a salt thereof, having a weight-average molecular weight of less than 550. The aminocarboxylic acid means a compound having a nitrogen atom and a carboxyl group in one molecule. Examples of the aminocarboxylic acid chelating agent include aminocarboxylic acids or salts thereof, such as nitrilotriacetic acid or a salt thereof, ethylenediaminetetraacetic acid or a salt thereof, diethylenetriaminepentaacetic acid or a salt thereof, β-alaninediacetic acid or a salt thereof, aspartic acid diacetic acid or a salt thereof, methylglycinediacetic acid or a salt thereof, iminodisuccinic acid or a salt thereof, and ethylenediaminedisuccinic acid or a salt thereof; and hydroxyaminocarboxylic acids or salts thereof, such as serinediacetic acid or a salt thereof, hydroxyiminodisuccinic acid or a salt thereof, hydroxyethylethylenediaminetriacetic acid or a salt thereof, and dihydroxyethylglycine or a salt thereof. Examples of the hydroxycarboxylic acid chelating agent include citric acid or a salt thereof, tartaric acid or a salt thereof, and gluconic acid or a salt thereof.

[0034] The content of the surfactant-containing particles is preferably from 50 to 99 mass %, more preferably from 70 to 95 mass %, particularly preferably from 80 to 93 mass %, based on the total mass of the cleaning composition.

[0035] As the percarbonate, sodium percarbonate may be used as it is, or coated sodium percarbonate particles in which sodium percarbonate particles are coated may be used. By using coated sodium percarbonate particles, the stability of sodium percarbonate during storage can be improved. As the coated sodium percarbonate particles, known ones can be used. For example, those coated with silicic acid and / or a silicate and boric acid and / or a borate, or those coated with a combination of a surfactant such as LAS and an inorganic compound are preferable. Specifically, as described in Japanese Patent No. 2918991, etc., those coated by spraying an aqueous solution of silicic acid and / or an alkali metal silicate and an aqueous solution of boric acid and / or an alkali metal borate, etc., as described in Japanese Patent No. 2871298, etc., those coated with aromatic hydrocarbon sulfonic acid and / or an alkali silicate having an average particle size of 10 to 500 μm, carbonate, bicarbonate, sulfate, etc., and those coated with a water-insoluble organic compound such as paraffin or wax can be mentioned. In order to make the particles non-hazardous, the coated sodium percarbonate particles may be powder-blended with various inorganic substances such as sodium carbonate and sodium bicarbonate. Commercially available products may be used as sodium percarbonate and coated sodium percarbonate particles. For example, SPCC (Zhejiang Jinke Chemicals Co., Ltd.), Sodium Percarbonate (Zhejiang DC Chemical Co., Ltd.), PC-W (Nippon Peroxide), etc. are suitable.

[0036] Examples of the enzyme include protease, amylase, lipase, cellulase, mannanase, pectinase, and phosphodiesterase, and commercially available granulated products can be used. Any enzyme may be appropriately selected in consideration of storage stability with other ingredients. Enzymes may be used alone or in combination of two or more kinds.

[0037] Examples of the fragrance include those described in JP-A-2002-146399.

[0038] The detergent composition may be in the form of a liquid or a solid such as a powder or tablet. From the viewpoint of the storage stability of the antibacterial base or disinfectant base, a powder is preferred.

[0039] The method of producing and using the cleaning composition is described below.

[0040] [1. Production of surfactant-containing particles] The surfactant-containing particles shown in Table 1 were produced by the following procedure. The compositions shown in Table 1 are in mass % in the surfactant-containing particles. An anionic surfactant acid precursor (alkylbenzenesulfonic acid (LAS)) and an alkaline agent were mixed in equimolar amounts in a dissolution tank, and the other components were added to water to prepare a surfactant slurry (sodium alkylbenzenesulfonate (LAS-Na)) with a solid content of 30 to 60 mass %. Water was placed in a jacketed mixing tank equipped with a stirrer, and the temperature was adjusted to 60°C. LAS-Na was added to the mixture, and the mixture was stirred for 10 minutes. Then, an acrylic acid-based polymer agent was added. After stirring for another 10 minutes, zeolite for spray drying, sodium carbonate, sodium sulfate, sodium silicate, a chelating agent, and a fluorescent agent were added. After stirring for another 20 minutes, a slurry for spray drying with a moisture content of 38% by mass was prepared, and the slurry was spray-dried using a countercurrent spray drying tower to obtain surfactant-containing particles. The drying temperature of the spray drying is preferably 250 to 500° C., more preferably 260 to 400° C. When the drying temperature is equal to or higher than the lower limit, the fluidity of the particles after spray drying can be improved. When the drying temperature is equal to or lower than the upper limit, the environmental load can be reduced. The drying time is preferably 1 to 30 minutes, more preferably 2 to 10 minutes. When the drying time is equal to or more than the lower limit, the fluidity of the particles after spray drying can be improved. When the drying time is equal to or less than the upper limit, the environmental load can be reduced.

[0041] [Table 1]

[0042] [2. Production of cleaning composition] The obtained surfactant-containing particles were used to manufacture the following procedure. Component (B), surfactant-containing particles, and other components are dry-mixed, and then component (A) and a fragrance are spray-mixed. For example, component (B), surfactant-containing particles, and optionally other components are fed in fixed amounts onto a belt conveyor, and while mixing with a rotary separator, component (A) and a fragrance are sprayed onto the components to produce a granular detergent. Examples of the rotary separator include a trommel (rotary drum) and a rotary sieve. The mixing time is preferably 15 seconds to 20 minutes, and more preferably 30 seconds to 10 minutes. When the mixing time is equal to or more than the lower limit, the fluidity of the granular detergent can be improved. When the mixing time is equal to or less than the upper limit, the productivity of the granular detergent can be improved. The order of adding particulate components to the powder mixer is not particularly limited, and the (B) component, surfactant-containing particles, and other components may all be preliminarily charged in the mixer and mixed, or they may be added to the mixer in any order and mixed. From the viewpoint of the fluidity of the particle group, it is preferable to add the surfactant-containing particles and then mix the (B) component. Also, after the particles are mixed, component (A) and liquid components such as a fragrance are added by spraying.

[0043] The cleaning composition of the present invention can be obtained by the above-mentioned production method.

[0044] [Method of using the cleaning composition] The method of using the detergent composition (i.e., the cleaning method) is the same as the conventionally known cleaning method. For example, the cleaning method includes a method in which the detergent composition is dispersed in water to a desired concentration to prepare a cleaning solution, the article to be washed is immersed in the cleaning solution for a desired period of time, and then the article to be washed is rinsed with water (immersion cleaning method). The content of the detergent composition in the cleaning liquid is appropriately determined depending on the composition and formulation of the detergent composition, etc. For example, the content of the detergent composition in the cleaning liquid is preferably 0.1 to 0.6 mass%, more preferably 0.4 to 0.6 mass%, and further preferably 0.5 mass%. If the amount is less than the lower limit, the cleaning effect may decrease, whereas if the amount is more than the upper limit, the cleaning agent may remain undissolved in the cleaning liquid or rinsing may become complicated. The pH of the cleaning liquid is not particularly limited, but is preferably 8 to 10.5. If the pH is equal to or higher than the lower limit, rinsing properties are easily improved, and if the pH is equal to or lower than the upper limit, cleaning power is easily improved.

[0045] In addition, the cleaning method may include a method in which the object is immersed in a cleaning liquid and scrubbed by hand. In this cleaning method, the content of the cleaning agent composition in the cleaning liquid is the same as the content of the cleaning agent composition in the cleaning liquid in the immersion cleaning method.

[0046] Alternatively, the washing method may include a method in which the washing liquid and the items to be washed are put into a washing machine and the washing liquid is stirred. In this washing method, the content of the detergent composition in the washing liquid is preferably 0.05 to 0.2 mass%, more preferably 0.1 to 0.2 mass%. If it is equal to or more than the lower limit, the washing power is easily improved, and if it is equal to or less than the upper limit, the rinsing performance is easily improved.

[0047] The article to be washed is not particularly limited, but is preferably, for example, a textile product such as clothing, dish towels, sheets, curtains, etc. This is because the detergent of the present invention can exhibit excellent detergency for textile products. EXAMPLES

[0048] The present invention will be described in more detail below using examples, but the present invention is not limited to these examples. The composition (content (mass %)) of the cleaning composition of each example is shown in Tables 2 and 3. If any ingredient is left blank in the table, that ingredient is not included. The raw materials used in this example are as follows:

[0049] [Component (A)] A-1: Silver oxide aqueous solution (0.1%, Nipaguard(R) SVO, Clariant). ·A-2: Silver nitrate aqueous solution (0.1%, SilverdurTM 930 FLEX Antimicrobial, manufactured by Microbial Control Japan LLC).

[0050] [(B) Component] B-1: α-sulfofatty acid methyl ester salt (MES) (in the formula (b1), R1 is an alkyl group having 14 carbon atoms, R 2 α-Sulfofatty acid ester salt in which R is a methyl group: 1 is an alkyl group having 16 carbon atoms, R 2 and α-sulfofatty acid ester salts in which the functional group is a methyl group = 85:15 (mass ratio) mixture (product name: MIZULAN P-82, manufactured by GECM). B-2: Sodium alkyl sulfate (AS) (product name: Texapon(R) HC G, manufactured by BASF).

[0051] [Optional ingredients] Sodium percarbonate (product name: PC-W, manufactured by Nippon Pearl Oxide Oriental Chemical Industry Co., Ltd.). -Enzymes (product names: Deozyme III Pink, Medley SuperioR 200T, manufactured by Novozymes Japan Co., Ltd.). Fragrance (fragrance composition A described in JP 2002-146399 A). LAS-Na: LAS-H (linear alkyl (carbon number 10-14) benzenesulfonic acid, product name: Lipon LH-200 (purity 96% by mass), manufactured by Lion Corporation) neutralized with a 48% by mass sodium hydroxide aqueous solution) Sodium carbonate (product name: soda ash (granular ash), manufactured by Tosoh Corporation). Sodium silicate (product name: Powdered sodium silicate No. 2, manufactured by Nippon Chemical Industry Co., Ltd.). Sodium sulfate (product name: Glauber's salt, manufactured by Nippon Chemical Industry Co., Ltd.). -Acrylic acid-based polymer (product name: Acusol 420N, manufactured by Dow Chemical). Zeolite (product name: A-type zeolite, manufactured by Taisilicate Co., Ltd., moisture content 4%). Chelating agent (tetrasodium hydroxyiminodisuccinate, trade name: HIDS, manufactured by Nippon Shokubai Co., Ltd.). Fluorescent agent (product name: Tinopal CBS, manufactured by BASF; Tinopal DMA-X, manufactured by BASF).

[0052] [Evaluation method] (1) Detergency evaluation method Five pieces of sebum-stained model cloth (trade name: Wfk30D) (hereinafter referred to as soiled cloth) and a charged cloth (a knitted cloth cut into small pieces, thoroughly washed, rinsed, and dried) were weighed to a predetermined bath ratio (30 times) and placed in a cleaning tester (Terg-O-Tometer (manufactured by USTesting)), followed by the addition of a cleaning solution. The cleaning solution used was 900 mL of tap water at 25°C, with the detergent composition dissolved to a concentration of 1667 ppm (by mass). After washing for 10 minutes at 120 rpm and 25° C., the cloth was rinsed twice for 3 minutes with 900 mL of tap water at 25° C. The soiled cloth after this treatment (hereinafter referred to as "washed cloth") was taken out and dried, and the reflectance of the washed cloth was measured, and the cleaning rate was calculated by the following formula (i). The reflectance was measured using a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name: SE-7700, 460 nm filter) (the reflectance was calculated as R=Z / 100 from Hunter whiteness Z). White cloth (original cloth) with no dirt attached was used as the uncontaminated cloth. Cleaning rate (%) = (K / S of soiled cloth - K / S of cloth after cleaning) / (K / S of soiled cloth - K / S of unsoiled cloth) × 100 (i) (In formula (i), K / S=(1-R / 100) 2 / (2R / 100), where K is the absorption coefficient, S is the scattering coefficient, and R is the absolute reflectance.

[0053] (Evaluation Criteria) The average value of the cleaning rate of the five sheets after the cleaning power evaluation was calculated, and the cleaning power was evaluated based on the following evaluation criteria. The higher the cleaning rate value, the higher the cleaning power. The evaluation of ⊚ and ◯ was deemed to be acceptable. ◎: 89% or more ○: 85% or more but less than 89% ×: Less than 85%

[0054] (2) Evaluation method for discoloration inhibition 30 g of each cleaning composition was placed in a 50 mL wide-mouth glass bottle (colorless and transparent) with a lid, sealed, and then placed in a thermostatic chamber whose temperature was adjusted to 50° C. After 7 days, the sample was taken out and cooled in air, and then the appearance was visually confirmed.

[0055] (Evaluation Criteria) ○: No change in appearance. △: No yellowing was observed, but a small amount of yellowed particles were observed inside when mixed several times. ×: Significant yellowing was observed.

[0056] [Table 2] [Table 3]

Claims

1. Component (A): a water-soluble silver compound, Component (B): an α-sulfofatty acid ester salt represented by the following general formula (b1), A laundry detergent composition comprising: The clothing detergent composition, wherein the content of the component (A) is 1 mass % or less, and the content of the component (B) is 0.2 to 4.5 mass %, based on the total mass of the clothing detergent composition. R １ CH(SO ３ M)COOR ２ ・・・(b1) [In the formula (b1), R １ is a hydrocarbon group having 10 to 16 carbon atoms, R ２ is a hydrocarbon group having 1 to 6 carbon atoms, and M is a counter ion.

2. 2. The laundry detergent composition according to claim 1, wherein the component (A) is at least one selected from silver oxide and silver nitrate.

3. The laundry detergent composition according to claim 1 or 2, which is in the form of a powder.

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