Liquid detergent composition for textile products

Abstract

To provide a liquid detergent composition for textile products that excels in the power of cleaning particle stains as well as storage stability.SOLUTION: Provided is a liquid detergent composition for textile products, the composition containing water and a component (a), a component (b), and a component (c) below, wherein: the amount of the component (a) contained in the composition is 5-30 mass%; the amount of the component (c) contained in the composition is 2-20 mass%; and the mass ratio (c) / (b) of the component (c) content to the component (b) content is 1-15. Component (a): a surfactant. Component (b): a copolymer containing an acrylic acid and a maleic acid as constituent monomers, or a salt thereof. Component (c): a neutral inorganic salt containing monovalent cations.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] Particulate dirt such as mud attached to clothing and other textile products is difficult to remove in a washing machine, and can impair the cleaning results. If the cleaning results are not satisfactory, hand washing in addition to washing can improve the finish.

[0003] Patent Document 1 discloses an aqueous gel laundry detergent composition containing (a) an anionic surfactant, (b) a fatty acid, and (c) a structuring agent characterized by sodium sulfate. Patent Document 2 discloses a laundry detergent composition comprising (i) an anionic surfactant, (ii) a nonionic surfactant, (iii) any cationic surfactant, (iv) any detergent builder, and (v) a polycarboxylic acid polymer. Patent Document 3 discloses a liquid cleaning or detergent comprising a surfactant, a graying-inhibiting polysaccharide, a thickener, and an inorganic salt. Patent Document 4 discloses a liquid laundry detergent composition comprising a surfactant, a copolymer of acrylic acid and maleic acid, and water, and not containing a carbonate builder, a phosphorus-containing builder, or a phosphorus-containing chelating agent. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Special Publication No. 2001-524591 [Patent Document 2] U.S. Patent No. 7078373 [Patent Document 3] Special Publication No. 2012-533640 [Patent Document 4] U.S. Patent No. 6034045 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Particulate dirt such as mud that adheres to textile products such as clothing tends to remain as discoloration, potentially impairing the perceived cleanliness of the textile products. Therefore, there is a need for further improvement in cleaning power against particulate dirt. In view of the above circumstances, the present invention provides a novel liquid detergent composition for textile products that has excellent cleaning power against particulate dirt and excellent storage stability. [Means for solving the problem]

[0006] The present invention relates to a liquid detergent composition for textile products, comprising the following components (a), (b), (c), and water, wherein the content of component (a) in the composition is 5% by mass or more and 30% by mass or less, the content of component (c) in the composition is 2% by mass or more and 20% by mass or less, and the mass ratio (c) / (b) of the content of component (c) to the content of component (b) is 1 or more and 15 or less. (a) Ingredients: Surfactants (b) Components: Copolymers or salts thereof containing acrylic acid and maleic acid as constituent monomers. (c) Components: Neutral inorganic salt containing a monovalent cation

[0007] Furthermore, the present invention relates to a method for cleaning textile products, comprising bringing the above-mentioned liquid detergent composition for textile products into contact with the textile products. [Effects of the Invention]

[0008] According to the present invention, a novel liquid detergent composition for textile products can be provided that exhibits excellent cleaning power against particulate dirt and superior storage stability. [Modes for carrying out the invention]

[0009] The reason why the liquid detergent composition for textile products of the present invention exhibits excellent cleaning power against particulate dirt such as mud particles is not entirely clear, but it is thought to be as follows. It is believed that by bringing the surfactant (component a) and the neutral inorganic salt (component c) into contact with the textile product, when mechanical force is applied to the textile product through kneading or water flow, the fibers constituting the textile product become more easily displaced, thereby promoting the removal of particulate dirt from the fibers. Furthermore, the copolymer or salt thereof, which is component (b), i.e., the copolymer or salt thereof containing acrylic acid and maleic acid as constituent monomers, is thought to adsorb to particulate dirt, disperse the particulate dirt through steric and electrostatic repulsion, and suppress the re-adhesion of particulate dirt to textile products. At this time, by selecting a predetermined neutral inorganic salt as component (c) and using it in a predetermined ratio with respect to component (b), it is thought that the amount of adsorption of component (b) to particulate dirt is increased without impairing the storage stability of the liquid detergent composition for textile products, thereby improving the cleaning performance against particulate dirt. However, the present invention is not limited to this mechanism.

[0010] The liquid detergent composition for textile products of the present invention has improved cleaning power against particulate dirt such as mud particles, and can effectively remove visible dirt. If visible dirt is not removed, even if bacteria and odors are eliminated, the visual impression tends to give the impression that dirt, odor, and bacteria remain. However, by thoroughly removing particulate dirt, it is possible to create the impression that not only the visual finish is improved, but also that odors and bacteria have been thoroughly cleaned. As a result, the cleaning effect on odors and bacteria can be felt more clearly, in addition to the visual cleaning effect.

[0011] The liquid detergent composition for textile products of the present invention (hereinafter referred to as the detergent composition of the present invention) contains the following components (a), (b), (c), and water. (a) Ingredients: Surfactants (b) Components: Copolymers or salts thereof containing acrylic acid and maleic acid as constituent monomers. (c) Components: Neutral inorganic salt containing a monovalent cation

[0012] (a) component is a surfactant. The (a) component is one or more surfactants selected from anionic surfactants, nonionic surfactants, amphoteric surfactants, and cationic surfactants, preferably one or more surfactants selected from anionic surfactants and nonionic surfactants, and more preferably one or more surfactants selected from anionic surfactants. The detergent composition of the present invention preferably contains an anionic surfactant as the (a) component. In this case, other surfactants than the anionic surfactant can also be contained, and the surfactant other than the anionic surfactant is preferably a nonionic surfactant.

[0013] From the viewpoint of detergency, the liquid detergent composition for textile products of the present invention preferably contains an anionic surfactant as the (a) component. In the (a) component, the proportion of the anionic surfactant is preferably 80% by mass or more, further preferably 85% by mass or more, further preferably 90% by mass or more, and preferably 100% by mass or less, and this proportion may be 100% by mass.

[0014] Examples of the anionic surfactant include anionic surfactants having a hydrocarbon group with 8 to 24 carbon atoms and a sulfonic acid group or a sulfuric acid ester group. The sulfonic acid group or the sulfuric acid ester group may be a salt. Examples of the anionic surfactant having a sulfuric acid ester group include alkyl or alkenyl sulfate salts and polyoxyalkylene alkyl or alkenyl ether sulfate salts. Examples of the anionic surfactant having a sulfonate group include alkylbenzene sulfonates. Other examples of the anionic surfactant include fatty acids having 12 to 24 carbon atoms or salts thereof. Among them, polyoxyalkylene alkyl or alkenyl ether sulfate salts are preferable from the viewpoint of improving detergency.

[0015] Examples of the anionic surfactant include one or more compounds selected from the compounds represented by the following general formula (1). R 1a , n , , ,

[0015] , , -O-(AO) n -SO3M (1) 〔In the formula, R1a [wherein A is an aliphatic hydrocarbon group having 10 to 18 carbon atoms, AO is one or more alkylene oxy groups selected from alkylene oxy groups having 2 carbon atoms and alkylene oxy groups having 3 carbon atoms, n is the average number of moles of AO added, which is between 1 and 4, and M is a cation.]

[0016] In general formula (1), R 1a The number of carbon atoms is 10 or more, preferably 12 or more, from the viewpoint of cleaning power, and 18 or less, preferably 16 or less, more preferably 14 or less, from the viewpoint of storage stability. 1a R may be an alkyl group or an alkenyl group, with alkyl groups being preferred. 1a The chain may be linear or branched, with linear being preferred.

[0017] In general formula (1), AO is one or more alkylene oxy groups selected from alkylene oxy groups having 2 carbon atoms and alkylene oxy groups having 3 carbon atoms. If AO contains two alkylene oxy groups, these alkylene oxy groups may be block-bonded or randomly bonded.

[0018] In general formula (1), n ​​is between 1 and 4 from the viewpoint of cleaning power.

[0019] In general formula (1), M is a cation (except for hydrogen ions). Examples of M include alkali metal ions such as lithium ions, sodium ions, and potassium ions; alkaline earth metal ions such as calcium ions and barium ions; and organic ammonium ions such as triethanolammonium ions, diethanolammonium ions, monoethanolammonium ions, trimethylammonium ions, and monomethylammonium ions. From the viewpoint of cleaning power, alkali metal ions and alkanolammonium ions are preferred for M, sodium ions, potassium ions, triethanolammonium ions, diethanolammonium ions, and monoethanolammonium ions are more preferred, and sodium ions are even more preferred.

[0020] When the component (a) contains a compound represented by the general formula (1), the proportion of the compound represented by the general formula (1) in the component (a) is preferably 80% by mass or more, 85% by mass or more, 90% by mass or more, and 100% by mass or less, and this proportion may be 100% by mass.

[0021] Examples of the nonionic surfactant of the component (a) include polyalkylene glycol type nonionic surfactants such as polyoxyalkylene alkyl or alkenyl ether, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene alkyl phenyl ether, polyoxyalkylene (hydrogenated) castor oil, and polyhydric alcohol type nonionic surfactants such as sucrose fatty acid ester, polyglycerol alkyl ether, polyglycerol fatty acid ester, alkyl glycoside, and fatty acid alkanolamide. As the nonionic surfactant of the component (a), a polyoxyalkylene type nonionic surfactant, and further a nonionic surfactant containing an ethyleneoxy group are preferable.

[0022] As the nonionic surfactant containing an ethyleneoxy group, a nonionic surfactant represented by the following general formula (2) is preferable. R 2a (CO) s O-(AO) t -R 2b (2) [In the formula, R 2a is an aliphatic hydrocarbon group having 9 to 18 carbon atoms, R 2b is a hydrogen atom or a methyl group. CO is a carbonyl group, s is a number of 0 or 1. The AO group is an alkyleneoxy group having 2 to 4 carbon atoms containing an ethyleneoxy group. t is the average number of added moles and is a number of 1 or more and 50 or less.]

[0023] In the general formula (2), R 2aThe number of carbon atoms is 9 or more, preferably 10 or more, more preferably 11 or more, and 18 or less, preferably 16 or less, more preferably 15 or less, and even more preferably 14 or less. In general formula (2), t is the average number of moles added of AO groups, and is a number that is 1 or more, preferably 4 or more, more preferably 6 or more, even more preferably 8 or more, and 50 or less, preferably 20 or less, even more preferably 15 or less, and even more preferably 12 or less. If the AO group contains two or more alkylene oxy groups, the different types of AO groups may be block-bonded or randomly bonded. The bonding order of the different types of AO groups is not relevant.

[0024] (a) The amphoteric surfactant of component (a) is not particularly limited, but examples include N-alkyl-N,N-dimethylamine oxide having an alkyl group preferably with 8 or more carbon atoms, more preferably with 10 or more carbon atoms, and preferably with 18 or fewer carbon atoms, and more preferably with 16 or fewer carbon atoms; N-alkylcarbonylaminopropyl-N,N-dimethylamine oxide having an alkyl group with a carbon number in the range described above; N-alkyl-N,N-dimethylaminoacetic acid betaine having an alkyl group with a carbon number in the range described above; N-alkylcarbonylaminopropyl-N,N-dimethylaminoacetic acid betaine having an alkyl group with a carbon number in the range described above; and N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine having an alkyl group with a carbon number in the range described above.

[0025] (a) Examples of cationic surfactants for component (a) include quaternary ammonium surfactants or tertiary amine surfactants.

[0026] (b) Component is a copolymer or a salt thereof containing acrylic acid and maleic acid as constituent monomers. If component (b) is a salt, the copolymer is preferably one or more alkali metal salts selected from lithium, sodium and potassium, and a sodium salt is more preferred. The weight-average molecular weight of component (b) is preferably 500 or more, more preferably 5,000 or more, and preferably 100,000 or less, more preferably 50,000 or less, from the viewpoint of cleaning power. The weight-average molecular weight of component (b) can be measured, for example, by gel permeation chromatography (GPC) as shown below.

[0027] *GPC conditions Equipment: GPC (HLC-8320GPC), manufactured by Tosoh Corporation. Columns: G4000PWXL + G2500PWXL (manufactured by Tosoh Corporation) Eluent: 0.2M phosphate buffer / CH3CN=9 / 1 Flow rate: 1.0mL / min Column temperature: 40℃ Detection: RI Sample size: 0.2 mg / mL Standard substances: Polyethylene glycol equivalent (monodisperse polyethylene glycol: molecular weight 250,000, 145,000, 87,500, 46,000, 24,000)

[0028] (b) In the total constituent monomers constituting the component, the molar ratio of acrylic acid [(acrylic acid) / (total constituent monomers)] is preferably 0.20 or higher, more preferably 0.40 or higher, and even more preferably 0.60 or higher from the viewpoint of storage stability, and preferably less than 1.0, more preferably 0.90 or lower, and even more preferably 0.80 or lower from the viewpoint of cleaning power. (b) If the molar ratio of acrylic acid in all constituent monomers constituting component ((acrylic acid) / (total constituent monomers)) is within the above range, then the constituent monomers other than acrylic acid in all constituent monomers constituting component (b) may be maleic acid or maleic acid and other constituent monomers listed below. (b) In the total constituent monomers that make up component (b), the molar ratio of maleic acid [(maleic acid) / (total constituent monomers)] is preferably 0.20 or more, more preferably 0.40 or more, and even more preferably 0.60 or more, from the viewpoint of cleaning power, and preferably 0.80 or less, more preferably 0.60 or less, and even more preferably 0.40 or less, from the viewpoint of storage stability. Furthermore, when the content of component (c) in the detergent composition of the present invention is preferably 4% by mass or more, more preferably 5% by mass or more, the above molar ratio [(acrylic acid) / (total constituent monomers)] is preferably 0.20 or more, more preferably 0.40 or more, even more preferably 0.50 or more, even more preferably 0.60 or more, even more preferably 0.70 or more, and preferably less than 1.0, more preferably 0.90 or less, and even more preferably 0.80 or less. Furthermore, in the detergent composition of the present invention, when the mass ratio (c) / (b) of the content of component (c) to the content of component (b) is preferably 4 or more, more preferably 5 or more, the above molar ratio [(acrylic acid) / (total constituent monomers)] is preferably 0.20 or more, more preferably 0.40 or more, even more preferably 0.50 or more, even more preferably 0.60 or more, even more preferably 0.70 or more, and preferably less than 1.0, more preferably 0.90 or less, and even more preferably 0.80 or less.

[0029] (b) Component may contain constituent monomers other than acrylic acid and maleic acid (hereinafter referred to as "other constituent monomers") as constituent monomers. An example of other constituent monomers is methacrylic acid. In this case, the molar ratio of the total amount of acrylic acid and maleic acid in the total constituent monomers constituting component (b) [(total amount of acrylic acid and maleic acid) / (total constituent monomers)] is preferably 0.80 or more, more preferably 0.85 or more, even more preferably 0.90 or more, and less than 1.0, from the viewpoint of cleaning power. Component (b) may be a copolymer or salt thereof that does not contain other constituent monomers, i.e., the molar ratio [(total amount of acrylic acid and maleic acid) / (total constituent monomers)] may be 1.0.

[0030] (c) component is a neutral inorganic salt containing monovalent cations. (c) component may be a neutral inorganic salt composed of a combination of one or more alkali metal ions selected from lithium, sodium and potassium and one or more counter ions selected from sulfate ions and chloride ions. Examples of the (c) component include one or more selected from sodium sulfate, potassium sulfate, lithium sulfate, sodium chloride, potassium chloride, and lithium chloride. From the viewpoint of storage stability, one or more selected from sodium sulfate and potassium chloride are preferable, and sodium sulfate is more preferable. (c) component may contain sodium sulfate. When the (c) component contains sodium sulfate, the content of sodium sulfate in the (c) component may preferably be 80% by mass or more, more preferably 85% by mass or more, still more preferably 90% by mass or more, and 100% by mass or less.

[0031] The neutral inorganic salt may be an inorganic salt in which the pH of a solution obtained by dissolving the neutral inorganic salt in water is near neutral at 25°C. Specifically, the neutral inorganic salt is an inorganic salt in which the pH of a solution obtained by dissolving 1 g of the neutral inorganic salt in 100 g of water is preferably 5 or more, more preferably 6 or more, and preferably 9 or less, more preferably 8 or less at 25°C, and the inorganic salt may have a pH of 7 at 25°C of the solution. The pH of the solution obtained by dissolving the neutral inorganic salt in water can be measured by the following method.

[0032] <pH Measurement Method> Connect the pH measuring composite electrode (HORIBA glass ground-joint sleeve type) to the pH meter (HORIBA pH / ion meter F-23) and turn on the power. Use saturated potassium chloride aqueous solution (3.33 mol / L) as the internal solution for the pH electrode. Next, fill 100 mL beakers with pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution), and immerse them in a 25°C constant temperature bath for 30 minutes. Immerse the pH measuring electrode in the standard solutions adjusted to constant temperature for 3 minutes and perform calibration in the order of pH 6.86 → pH 9.18 → pH 4.01. Adjust the sample to be measured (solution in which a neutral inorganic salt is dissolved) to 25°C, immerse the electrode of the pH meter in the sample, and measure the pH after 1 minute.

[0033] The detergent composition of the present invention may contain water. The water may be the remainder after excluding component (a), component (b), component (c), and any optional component.

[0034] The detergent composition of the present invention may optionally contain components such as foaming agents, enzymes, pH adjusters, stabilizers, fluorescent dyes, fragrances, pigments, preservatives, and solvents.

[0035] In the detergent composition of the present invention, the content of component (a) is 5% by mass or more, preferably 10% by mass or more, from the viewpoint of cleaning power, and 30% by mass or less, preferably 25% by mass or less, more preferably 20% by mass or less, from the viewpoint of storage stability. If component (a) contains an anionic surfactant, the description of the mass of the anionic surfactant of component (a) (mass % or mass ratio) shall be based on the mass (mass in terms of sodium salt) when the counterion is assumed to be a sodium ion.

[0036] When the detergent composition of the present invention contains an anionic surfactant as component (a), the content of the anionic surfactant in the detergent composition of the present invention is, from the viewpoint of cleaning power, 5% by mass or more, more preferably 10% by mass or more, and preferably 25% by mass or less, and more preferably 20% by mass or less.

[0037] In the detergent composition of the present invention, the content of component (b) is preferably 0.5% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, even more preferably 5% by mass or more, and even more preferably 8% by mass or more, from the viewpoint of detergent power, and from the viewpoint of storage stability, it is 20% by mass or less, preferably 15% by mass or less, more preferably 12% by mass or less, even more preferably 8% by mass or less, and even more preferably 5% by mass or less. Note that the content of component (b) is calculated as acid.

[0038] In the detergent composition of the present invention, the content of component (c) is 2% by mass or more, preferably 4% by mass or more, more preferably 6% by mass or more, and even more preferably more than 6% by mass, from the viewpoint of cleaning power, and 20% by mass or less, preferably 15% by mass or less, and more preferably 12% by mass or less, from the viewpoint of storage stability.

[0039] In the detergent composition of the present invention, the mass ratio (a) / (c) of the content of component (a), furthermore the content of the anionic surfactant, furthermore the content of the compound represented by the general formula (1), and the content of component (c) is preferably 10 or less, more preferably 5 or less, and even more preferably 2 or less, from the viewpoint of cleaning power.

[0040] In the detergent composition of the present invention, the mass ratio (c) / (b) of the content of component (c) to the content of component (b) is 1 or more, preferably 3 or more, more preferably 5 or more, and even more preferably 8 or more, from the viewpoint of cleaning power, and 15 or less, preferably 12 or less, from the viewpoint of storage stability.

[0041] The liquid detergent composition for textile products of the present invention comprises (a) component, (b) component, (c) component and water, The amount of component (a) is 5% by mass or more and 30% by mass or less of the total amount of the composition. The amount of component (c) is 2% by mass or more and 20% by mass or less relative to the total amount of the composition. A liquid detergent composition for textile products may be provided, wherein the mass ratio (c) / (b) of the amount of component (c) to the amount of component (b) is 1 or more and 15 or less. The preferred content of the liquid detergent composition for textile products of the present invention can be substituted for the preferred blending amount of the liquid detergent composition for textile products of the present invention described above.

[0042] The present invention relates to a method for producing a liquid detergent composition for textile products by mixing the following components (a), (b), (c) and water, With respect to the total mass of the components to be mixed, the amount of component (a) mixed is 5% by mass or more and 30% by mass or less. With respect to the total mass of the components to be mixed, the amount of component (c) mixed is 2% by mass or more and 20% by mass or less. The present invention provides a method for producing a liquid detergent composition for textile products, comprising mixing component (a), component (b), component (c), and water in a mass ratio (c) / (b) of the amount of component (c) to the amount of component (b) mixed, where (c) / (b) is between 1 and 15. (a) Ingredients: Surfactants (b) Components: Copolymers or salts thereof containing acrylic acid and maleic acid as constituent monomers. (c) Components: Inorganic neutral salt containing a monovalent cation

[0043] In the method for producing the liquid detergent composition for textile products of the present invention, components (a), (b), and (c) described in the above-mentioned liquid detergent composition for textile products of the present invention can be preferably used. The content of components (a), (b), and (c) in the detergent composition of the present invention can be substituted for the mixed amounts of components (a), (b), and (c) in the method for producing the liquid detergent composition for textile products of the present invention.

[0044] The liquid detergent composition for textile products of the present invention can be used when washing textile products by hand and when washing textile products in a washing machine. When hand-washing textile products, the textile products may be washed by directly contacting them with the liquid detergent composition for textile products of the present invention, or by contacting them with a diluted version of the liquid detergent composition for textile products of the present invention. Furthermore, when washing textile products in a washing machine, the textile products may be brought into direct contact with the liquid detergent composition for textile products of the present invention before being washed in the washing machine, or the textile products may be placed in the washing machine along with the liquid detergent composition for textile products of the present invention and then washed in the washing machine. After applying the liquid detergent composition for textile products of the present invention to a textile product, the textile product can be washed by hand or other means, and then further washed in a washing machine.

[0045] The present invention provides a method for cleaning textile products, which involves bringing the liquid detergent composition for textile products of the present invention into contact with the textile product. Furthermore, the present invention provides a method for cleaning textile products, comprising applying the liquid detergent composition for textile products of the present invention to a textile product and then hand-washing the textile product. Hand-washing may involve applying external force to the textile product to which the detergent composition has been applied by human strength. Hand-washing may involve rubbing, scrubbing, or beating the textile product, and tools such as brushes or washboards may be used. Furthermore, the present invention provides a method for cleaning textile products, comprising applying the liquid detergent composition for textile products of the present invention to a textile product and washing the textile product in a washing machine. The preferred embodiments and modes of use of components (a), (b), (c), etc., of the liquid detergent composition for textile products used in the method for washing textile products of the present invention are the same as those of the liquid detergent composition for textile products of the present invention.

[0046] The present invention provides a method for cleaning textile products, which may involve applying the cleaning agent composition of the present invention to the textile product and then hand-washing the textile product to which the cleaning agent composition has been applied. Alternatively, after hand-washing, the textile product may be further washed in a washing machine. The present invention may provide a method for cleaning textile products, which may involve applying the cleaning agent composition of the present invention to a textile product and then washing the textile product coated with the cleaning agent composition using a water flow from a washing machine.

[0047] The present invention's method for cleaning textile products can be applied to various types of fibers, such as natural fibers, synthetic fibers, and semi-synthetic fibers. The present invention's method for cleaning textile products can be applied to textile products containing these fibers. The textile product may be, for example, clothing.

[0048] The fibers can be either hydrophobic or hydrophilic. Examples of hydrophobic fibers include protein-based fibers (milk protein casein fiber, Promix, etc.), polyamide-based fibers (nylon, etc.), polyester-based fibers (polyester, etc.), polyacrylonitrile-based fibers (acrylic, etc.), polyvinyl alcohol-based fibers (vinylon, etc.), polyvinyl chloride-based fibers (polyvinyl chloride, etc.), polyvinylidene chloride-based fibers (vinylidene, etc.), polyolefin-based fibers (polyethylene, polypropylene, etc.), polyurethane-based fibers (polyurethane, etc.), polyvinyl chloride / polyvinyl alcohol copolymer-based fibers (Polycloral, etc.), polyalkylene paraoxybenzoate-based fibers (benzoate, etc.), and polyfluoroethylene-based fibers (polytetrafluoroethylene, etc.). Examples of hydrophilic fibers include seed hair fibers (cotton, kapok, etc.), bast fibers (hemp, flax, ramie, cannabis, jute, etc.), leaf vein fibers (Manila hemp, sisal, etc.), coconut fibers, rush, straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuña, angora, etc.), silk fibers (domestic silk, wild silk), feathers, and cellulose fibers (rayon, polynosic, cupro, acetate, etc.). In the present invention, "textile products" refers to fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics using the aforementioned hydrophobic or hydrophilic fibers, and products such as undershirts, T-shirts, dress shirts, blouses, slacks, hats, handkerchiefs, towels, knitwear, socks, underwear, and tights obtained using the same. Preferred textile products are woven fabrics such as woven fabrics and knitted fabrics, and woven textile products. From a similar viewpoint, preferred textile products are textile products containing cotton fibers. [Examples]

[0049] <Examples and Comparative Examples> Liquid detergent compositions for textile products of the examples and comparative examples were prepared using the following components (a), (b), and (c), and the cleaning power and storage stability of each liquid detergent composition for textile products were evaluated using the evaluation method described below.

[0050] <(a) Components> (a-1) Polyoxyethylene (ethylene oxide average number of added moles 1) lauryl ether sulfate sodium, Emal 170J, manufactured by Kao Corporation. (a-2) Polyoxyethylene (ethylene oxide average number of moles added: 2) lauryl ether sulfate sodium, Emal 270J, manufactured by Kao Corporation. (a-3) Polyoxyethylene (ethylene oxide average number of moles added: 10) lauryl ether, KE110, manufactured by Kao Corporation.

[0051] <(b) Component> (b-1) Sodium salt of acrylic acid / maleic acid copolymer, Poise 520 (acrylic acid / maleic acid (AA / MA: molar ratio) = 71 / 29), weight-average molecular weight (MW) 31,500, manufactured by Kao Corporation. (b-2) Sodium salt of acrylic acid / maleic acid copolymer, Poise 521 (acrylic acid / maleic acid (AA / MA: molar ratio) = 44 / 56), weight-average molecular weight (MW) 21,300, manufactured by Kao Corporation. (b-3) Sodium salt of acrylic acid / maleic acid copolymer, oligomer KDS (acrylic acid / maleic acid (AA / MA: molar ratio) = 25 / 75), weight-average molecular weight (MW) 15,300, manufactured by Kao Corporation. <(b') component> (b'-1) Sodium salt of polyacrylic acid, oligomer D, weight-average molecular weight (MW) 10,000, manufactured by Kao Corporation.

[0052] <(c) component> (c-1) Anhydrous sodium sulfate, manufactured by PT. South Pacific Viscose. (c-2) Potassium chloride, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <(c') component> (c'-1) Anhydrous magnesium sulfate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. (c'-2) Anhydrous sodium metasilicate, manufactured by Kanto Chemical Co., Ltd. <Other ingredients> Water: Ion-exchanged water Fluorescent whitening agent: Chinopal CBS-X, manufactured by BASF. pH adjuster: Monoethanolamine (MEA), manufactured by The Dow Chemical Company. pH adjuster: Citric acid, manufactured by Weifang Ensign Industry Co Ltd.

[0053] <Method for evaluating cleaning power> (1) Preparation of artificial mud-stained cloth The model soiled cloth used for evaluation was prepared using the following procedure. This method causes particles to adhere between the fibers through re-soiling, resulting in a soiled cloth that is more difficult to clean than a soiled cloth with mud applied to the surface. The mud used was Kanuma horticultural akadama soil, dried at 120°C ± 5°C for 4 hours, then crushed and sieved through a 75 μm sieve. 6 g of mud was added to 1000 mL of deionized water, stirred, and then subjected to ultrasonic treatment for 15 minutes. These were transferred to a turgotometer, 15 g of cotton knit cloth (purchased from Tanigashira Shoten, 6 cm x 6 cm) was added, and stirred at 20°C, 100 rpm for 20 minutes. After that, it was rinsed with running water for 1 minute, dewatered for 1 minute, and air-dried overnight. (2) Application and cleaning conditions For each piece of fabric soiled with artificial mud, 0.1 g of the liquid detergent composition for textile products described in Tables 1 and 2 was applied directly. The fabric was then hand-rubbed 10 times from two directions. Four of these soiled fabrics, each coated with the liquid detergent composition and hand-rubbed, were then added to 600 mL of hard water with a calcium carbonate equivalent of 179 mg / L (this hard water corresponds to 10°DH on the German hardness scale). The fabrics were then washed using a turgotometer under the following conditions: washing time 10 minutes, rotation speed 100 rpm, and water temperature 30°C. The cleaning power was determined by measuring the reflectance of the raw fabric before contamination and before and after washing using a colorimeter (Z-300A, manufactured by Nippon Denshoku Co., Ltd.), and calculating the cleaning rate (%) using the following formula. A higher cleaning rate indicates superior cleaning power of the liquid detergent composition for textile products. In this evaluation, a cleaning rate of 45% or higher is desirable. The reflectance before or after washing refers to the reflectance measured on the artificial sludge-contaminated fabric before or after washing, respectively. Cleaning rate (%) = 100 × [(Reflectance after cleaning - Reflectance before cleaning) / (Reflectance of the original fabric - Reflectance before cleaning)]

[0054] <Method for evaluating storage stability> The liquid detergent compositions for textile products described in Tables 1 and 2 were placed in 25g transparent standard bottles of PS-No. 6 manufactured by Ishida Container Co., Ltd., and left to stand in a constant temperature bath at 50°C. After 21 days, the appearance of each liquid detergent composition for textile products was observed visually and evaluated according to the following criteria. In the evaluation of liquid detergent compositions for textile products, a smaller number indicates a composition with better storage stability. Criteria 1 and 2 are at an acceptable level considering the product form, etc. Criteria 3 and 4 are at an unacceptable level considering the product form, etc. 1: Maintains transparency, and no separation is observed. 2: Although cloudy in the initial stages, separation is not observed. 3: Separation is observed after storage. 4: Separation is observed in the early stages.

[0055] [Table 1]

[0056] [Table 2]

Claims

1. The composition contains the following components (a), (b), (c) and water: In the composition, the content of component (a) is 5% by mass or more and 30% by mass or less, In the composition, the content of the (c) component is 2% by mass or more and 20% by mass or less, the mass ratio (c) / (b) of the content of the (c) component to the content of the (b) component is 4 or more and 15 or less; A liquid detergent composition for textile products. Component (a): Surfactant Component (b): A copolymer or a salt thereof containing acrylic acid and maleic acid as constituent monomers (c) Component: Neutral inorganic salt containing a monovalent cation

2. 2. The liquid detergent composition for fabric products according to claim 1, wherein the component (a) is one or more surfactants selected from anionic surfactants, nonionic surfactants, amphoteric surfactants and cationic surfactants.

3. 3. The liquid detergent composition for textile products according to claim 1, wherein the component (a) comprises a compound represented by the following general formula (1): R １ａ -O-(AO) ｎ -SO ３ M (1) [In the formula, R １ａ is an aliphatic hydrocarbon group having 10 to 18 carbon atoms, AO is one or more alkyleneoxy groups selected from an alkyleneoxy group having 2 carbon atoms and an alkyleneoxy group having 3 carbon atoms, n is the average number of moles of AO added and is a number of 1 to 4, and M is a cation.

4. 3. The liquid detergent composition for textile products according to claim 1, wherein the molar ratio of acrylic acid in all constituent monomers of component (b) [(acrylic acid) / (total constituent monomers)] is 0.20 or more and less than 1.

0.

5. 3. The liquid detergent composition for textile products according to claim 1 or 2, wherein the component (c) is sodium sulfate.

6. 3. The liquid detergent composition for textile products according to claim 1, wherein the content of component (c) in the liquid detergent composition for textile products is more than 6 mass% and not more than 12 mass%.

7. 3. The liquid detergent composition for textile products according to claim 1, wherein the mass ratio (c) / (b) of the content of the component (c) to the content of the component (b) is 4 or more and 12 or less.

8. A method for cleaning textile products, comprising contacting the textile product with the liquid detergent composition for textile products according to claim 1 or 2.

9. The method for washing textile products according to claim 8, comprising applying the liquid detergent composition for textile products to textile products and hand-washing the textile products.

10. The method for washing textile products according to claim 8, comprising applying the liquid detergent composition for textile products to textile products and washing the textile products in a washing machine.