JP7186608B2 - Cleaning composition for textile products - Google Patents

Description

The present invention relates to a detergent composition for textile products.

Conventionally, anionic surfactants such as alkylbenzene sulfonates, anionic surfactants containing an oxyalkylene group having 2 to 3 carbon atoms, olefin sulfonates and the like have been widely used as household and industrial cleaning ingredients. . It is also known to use various surfactants in combination in such applications. In addition, fatty acids are widely used as antifoaming agents and the like in detergent compositions for textile products.

Patent Document 1 describes a detergent composition containing a specific anionic surfactant containing an alkyleneoxy group and a specific compound containing an alkyleneoxy group in a specific ratio, and containing a fatty acid as an antifoaming agent.
Patent Document 2 discloses a detergent composition containing an internal olefin sulfonate and having excellent detergency against greasy stains with cold water of 30° C. or less.
Patent Document 3 discloses a detergent composition having excellent low-temperature stability by combining a specific organic solvent and a fatty acid with respect to an internal olefin sulfonate.
Patent Document 4 discloses a detergent composition having excellent detergency, containing an internal olefin sulfonate containing 25% or more of a β-hydroxy compound. A specific example describes a detergent composition comprising an internal olefin sulfonate and a nonionic surfactant.
Patent Document 5 describes a detergent composition containing an internal olefin sulfonate having a specific number of carbon atoms and a specific nonionic surfactant in a specific ratio.

Japanese Patent Application Laid-Open No. 2017-25208 Japanese Patent Publication No. 2017-520645 JP 2017-214576 A EP-A-377261 U.S. Pat. No. 5,078,916

Even if a polyoxyalkylene alkyl ether sulfate is selected for improving detergency, the further use of a fatty acid having from 10 to 20 carbon atoms or a salt thereof has the problem that the detergency decreases.

The present invention provides a detergent composition for textiles, which contains a polyoxyalkylene alkyl ether sulfate and a fatty acid having 10 to 20 carbon atoms or a salt thereof, and has improved detergency.

The present invention contains the following components (a), (b) and (c), and the mass ratio of the content of component (c) to the total content of components (a) and (b) (c) component / [(a) component + (b) component] is 0.01 or more and less than 1.0, it is related with the detergent composition for textiles.
(a) component: internal olefin sulfonate having 16 to 24 carbon atoms (b) component: polyoxyalkylene alkyl ether sulfate (c) component: fatty acid having 10 to 20 carbon atoms or a salt thereof

ADVANTAGE OF THE INVENTION According to this invention, the detergent composition for textiles containing a polyoxyalkylene alkyl ether sulfate and a C10-20 fatty acid or its salt, and having further improved detergency is provided. In the present invention, it is possible to obtain a detergent composition for textiles that can maximize the effect of combined use of a surfactant without lowering the detergency by using a fatty acid in combination.

When the detergent composition for textiles and water containing a hardness component are mixed to prepare a cleaning solution, the fatty acid or its salt binds to the hardness component in the water to further improve hydrophobicity, thereby lowering the solubility in the cleaning solution. It is thought that it is deposited in the washing solution. Polyoxyalkylene alkyl ether sulfate, which has been conventionally known as a cleaning component, cannot dissolve deposits formed by fatty acids or their salts due to hardness components in water, and fatty acids act like dirt and have a detergency. presumed to decrease.
The internal olefin sulfonate having 16 or more and 24 or less carbon atoms, which is the component (a) of the present invention, has a hydrophilic group inside the hydrocarbon group. thinking. In the present invention, the internal olefin sulfonate having 16 to 24 carbon atoms dissolves the crystals formed by the fatty acid and the hardness component of water in the cleaning liquid containing the hardness component and water, thereby washing the fatty acid or its salt. It is speculated that it is modified so that it acts as part of an effective surfactant for

<(a) component>
The component (a) of the present invention is an internal olefin sulfonate having 16 to 24 carbon atoms. In the present invention, the decrease in detergency caused by the combined use of the component (c) with respect to the detergent composition for textiles containing the component (b) is suppressed by further using the component (a) in combination, Moreover, the detergency can be improved. The number of carbon atoms in component (a) represents the number of carbon atoms in the internal olefin to which the sulfonate is covalently bonded. The number of carbon atoms in component (a) is 16 or more from the viewpoint of improving detergency when used in combination with component (b), and from the same viewpoint, it is 24 or less, preferably 20 or less, more preferably 18 or less. be.

The internal olefin sulfonate of the present invention is a sulfone obtained by sulfonating, neutralizing and hydrolyzing an internal olefin having 16 to 24 carbon atoms (an olefin having a double bond in the olefin chain) as a starting material. acid salt.
Such internal olefins include those containing a trace amount of so-called alpha olefins (hereinafter also referred to as α-olefins) in which the position of the double bond is located at the first position of the carbon chain.
In addition, when the internal olefin is sulfonated, β-sultone is generated quantitatively. Alkane sulfonates are converted into olefin sulfonates (for example, J. Am. Oil Chem. Soc. 69, 39 (1992)). Here, the hydroxy group of the resulting hydroxyalkanesulfonate is inside the alkane chain and the double bond of the olefinsulfonate is inside the olefin chain. In addition, the products obtained are mainly mixtures thereof, and some of them are hydroxyalkanesulfonates having a hydroxy group at the end of the carbon chain, or olefins having a double bond at the end of the carbon chain. Sulfonates may also be present in trace amounts.

Salts of internal olefin sulfonates include alkali metal salts, alkaline earth metal (1/2 atom) salts, ammonium salts or organic ammonium salts. Alkali metal salts include sodium salts and potassium salts. Examples of organic ammonium salts include alkanolammonium salts having 1 to 6 carbon atoms.

<(b) component>
The (b) component of the present invention is a polyoxyalkylene alkyl ether sulfate. In the polyoxyalkylene alkyl ether sulfate, alkyl means an aliphatic hydrocarbon group, including an alkyl group as a saturated aliphatic hydrocarbon group and an alkenyl group as an unsaturated aliphatic hydrocarbon group. called. The component (b) functions as an anionic surfactant. The component (b) has the function of washing away stains adhering to textile products. Component (b) is preferably a sulfate represented by the following general formula (1).
RO-(AO) _n - _SO3M (1)
[Wherein, R is an aliphatic hydrocarbon group having 12 to 16 carbon atoms, AO group is one or more groups selected from alkyleneoxy groups having 2 or 3 carbon atoms, n is an average The number of added moles is 0.5 or more and 5 or less, and M is a cation. ]

In general formula (1), R preferably has 12 or more and 14 or less carbon atoms. R is preferably an aliphatic hydrocarbon group containing an aliphatic hydrocarbon group having 12 or more and 14 or less carbon atoms from the viewpoint of further enhancing the detergency attached to textile products. Aliphatic hydrocarbon groups include alkyl groups and alkenyl groups.

In general formula (1), the AO group is one or more groups selected from alkyleneoxy groups having 2 or 3 carbon atoms, including one or more groups selected from ethyleneoxy groups and propyleneoxy groups. When n is 2 or more and 5 or less, the AO group may be a group consisting only of an ethyleneoxy group or a propyleneoxy group, or a group containing an ethyleneoxy group and a propyleneoxy group. In the case of a group containing an ethyleneoxy group and a propyleneoxy group, the ethyleneoxy group and the propyleneoxy group may be random bonds or block bonds. The AO group is preferably a group containing an ethyleneoxy group, and more preferably an ethyleneoxy group, from the viewpoint of further increasing the cleaning rate improvement rate by using the component (b) in combination.

In general formula (1), n is the average number of added moles of AO groups and is a number of 0.5 or more and 5; n is preferably 0.7 or more, more preferably 1 or more, and still more preferably 2 or more, from the viewpoint of further reducing the degree of decrease in detergency caused by combined use with component (c) described later. is more preferably 2.5 or more, and from the same viewpoint, it is preferably 4 or less, and more preferably 3 or less.

In general formula (1), M is a salt-forming cation. Examples of M include alkali metal ions such as sodium ion and potassium ion, ammonium ion and alkanolammonium ion. The alkanolammonium ion is preferably an alkanolammonium ion having a total carbon number of 2 or more and 6 or less.

<(c) component>
Component (c) of the present invention is a fatty acid having from 10 to 20 carbon atoms or a salt thereof. Component (c) is used, for example, as a component that controls foaming during washing and rinsing, and foam removal during rinsing. From the viewpoint of foam control, the component (c) preferably has 12 or more and 18 or less carbon atoms. Further, from the viewpoint of further increasing the rate of improvement in cleaning rate by using the component (c) in combination, the number of carbon atoms in the component (c) is 10 or more, preferably 12 or more, and still more preferably 14 or more. Therefore, it is 20 or less, preferably 18 or less, more preferably 16 or less.

Component (c) includes decanoic acid, lauric acid, myristic acid, palmitic acid, palmitoleic acid, stearic acid, oleic acid, linoleic acid, linoleic acid and salts thereof. It is also possible to use mixed fatty acids such as coconut fatty acids. Salts of fatty acids include inorganic salts selected from sodium salts, potassium salts, magnesium salts and ammonium salts, and organic amine salts such as monoethanolamine salts, diethanolamine salts and triethanolamine salts, preferably sodium salts and potassium salts. salts, magnesium salts, more preferably sodium salts and potassium salts.

<Composition, etc. of detergent composition for textile products>
The content of the component (a) and the content of the component (b) in the detergent composition for textiles shall be calculated by the mass in which the counter ion is converted to sodium ion. The content of the component (c) in the detergent composition for textiles shall be calculated in terms of the mass in acid form.

(c) component / [(a) component + (b ) component] is 0.01 or more, preferably 0.05 or more, more preferably 0.1 or more, and still more preferably 0.15 or more, from the viewpoint of further increasing the rate of improvement in cleaning efficiency when used in combination with component (c). Still more preferably 0.2 or more, and from the same viewpoint, less than 1.0, preferably 0.8 or less, more preferably 0.7 or less, even more preferably 0.6 or less, preferably 0.5 0.4 or less, more preferably 0.4 or less.

The mass ratio of the content of component (a) to the content of component (b), that is, component (a)/component (b), is preferable from the viewpoint of further increasing the rate of improvement in cleaning rate when component (c) is used in combination. is 0.01 or more, more preferably 0.05 or more, still more preferably 0.1 or more, still more preferably 0.2 or more, still more preferably 0.3 or more, and from the same point of view, 10 or less, preferably is 9 or less, more preferably 8 or less, even more preferably 6 or less, even more preferably 4 or less, and even more preferably 3 or less.

In the detergent composition for textile products of the present invention, the total amount of the content of component (a), the content of component (b) and the content of component (c) is It can be appropriately changed by setting the usage amount of the detergent composition for washing. For example, the total amount of the content of component (a), the content of component (b), and the content of component (c) is preferably 5% by mass or more, more preferably 7% by mass or more, and further It is preferably 10% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, and even more preferably 20% by mass or less. . It can be appropriately selected within these ranges.

When setting a large amount of the detergent composition for textiles per washing of textiles, the content of component (a) and the content of component (b) in the detergent composition for textiles The total content of component (c) can be set low. When the amount of the detergent composition for textiles used per washing of textiles is set to be small, the content of component (a) and the content of component (b) in the detergent composition for textiles The total content of the component (c) can be set large.

The content of component (c) in the detergent composition for textiles of the present invention is preferably 1% by mass or more, more preferably 2% by mass or more, and still more preferably 3% by mass or more, from the viewpoint of defoaming performance. , and more preferably 4% by mass or more. Furthermore, from the standpoint of cleaning the dirt adhering to the fibers, it is preferably 15% by mass or less, more preferably 10% by mass or less.

<Fiber>
The fibers constituting the textiles to be washed with the detergent composition for textiles of the present invention may be either hydrophobic fibers or hydrophilic fibers. Examples of hydrophobic fibers include protein fibers (milk protein casein fiber, Promix, etc.), polyamide fibers (nylon, etc.), polyester fibers (polyester, etc.), polyacrylonitrile fibers (acrylic, etc.), polyvinyl alcohol fibers, etc. Fibers (vinylon, etc.), polyvinyl chloride fibers (polyvinyl chloride, etc.), polyvinylidene chloride fibers (vinylidene, etc.), polyolefin fibers (polyethylene, polypropylene, etc.), polyurethane fibers (polyurethane, etc.), polyvinyl chloride/ Polyvinyl alcohol copolymer fibers (such as polycleral) are exemplified. Examples of hydrophilic fibers include seed hair fibers (cotton, cotton, kapok, etc.), bast fibers (hemp, flax, ramie, hemp, jute, etc.), leaf vein fibers (manila hemp, sisal hemp, etc.), palm fibers, rush, straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuna, angora, etc.), silk fibers (domestic silk, wild silk), feathers, cellulosic fibers (rayon, polynosic, cupra, acetate, etc.) etc. are exemplified.

<Textile products>
In the present invention, textile products include fabrics such as woven fabrics, knitted fabrics, and non-woven fabrics using the above-mentioned hydrophobic fibers and hydrophilic fibers, and undershirts, T-shirts, dress shirts, blouses, slacks, hats, etc. obtained using the same. Products such as handkerchiefs, towels, knitwear, socks, underwear, and tights.

<Water>
The detergent composition for textiles of the present invention can contain water. For example, water may be contained in order to make the composition of the present invention liquid at 4°C or higher and 40°C or lower. As water, deionized water (also referred to as ion-exchanged water) or water to which sodium hypochlorite is added in an amount of 1 mg/kf or more and 5 mg/kg or less to ion-exchanged water can be used.

<Optional component>
From the viewpoint of the appearance and quality stability of the cleaning composition for textiles, it is preferable to adjust the pH value of the cleaning composition of the present invention. The detergent composition for textiles of the present invention has a pH at 25°C of preferably 3 or higher, more preferably 4 or higher, and preferably 9 or lower, more preferably 8 or lower. In the present invention, a pH adjuster can be used to adjust the pH value. Specifically, an inorganic alkaline agent selected from sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and an amine compound. Selected organic alkaline agents can be mentioned. As the amine compound, an amine compound represented by the following general formula (I) is suitable. A suitable amount of the pH adjuster is added to adjust the pH of the cleaning composition.

(In the formula, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or a hydroxyalkyl group having 2 to 4 carbon atoms, and R′ and R″ each represent a hydrogen atom and 1 to 4 carbon atoms. or a hydroxyalkyl group having 2 to 4 carbon atoms.)

Examples of compounds represented by general formula (I) include monoethanolamine, diethanolamine, triethanolamine, N-methylpropanol, 2-amino-2-methyl-1-propanol and the like.

Among them, hydroxides such as potassium hydroxide and sodium hydroxide are preferable as the inorganic alkaline agent, and monoethanolamine is preferable as the organic alkaline agent, from the viewpoint of blending stability and cost of the detergent composition.

In addition, the following components (d1) to (d7) may be added to the cleaning composition for textiles of the present invention.
(d1) Anti-soil redeposition agents and dispersants such as polyacrylic acid, polymaleic acid and carboxymethyl cellulose in the composition at 0.01% by mass or more and 10% by mass or less (d2) Hydrogen peroxide, sodium percarbonate or sodium perborate, etc. 0.01% by mass or more and 10% by mass or less of the bleaching agent in the composition (d3) tetraacetylethylenediamine, bleaching activity represented by general formulas (I-2) to (I-7) of JP-A-6-316700 0.01% by mass or more and 10% by mass or less of a bleaching activator such as a bleaching agent in the composition,
(d4) One or more enzymes selected from cellulase, amylase, pectinase, protease and lipase, preferably one or more enzymes selected from amylase and protease in the composition at 0.001 mass% or more, preferably 0.01 % by mass or more, more preferably 0.1% by mass or more, more preferably 0.3% by mass or more, and 2% by mass or less, preferably 1% by mass or less (d5) fluorescent dye, such as Tinopal CBS (trade name, Ciba Specialty Chemicals) and Whitex SA (trade name, manufactured by Sumitomo Chemical Co., Ltd.) 0.001% by mass or more and 1% by mass or less of a fluorescent dye in the composition (d6) butylhydroxytoluene, distyrenated cresol, Antioxidants such as sodium sulfite and sodium hydrogen sulfite in the composition in an amount of 0.01% by mass or more and 2% by mass or less (d7) Appropriate amounts of pigments, fragrances, antibacterial preservatives, and antifoaming agents such as silicone.

- Production of internal olefin a1 having 16 carbon atoms According to the following method, internal olefin a1 having 16 carbon atoms, which is the starting material for component (a-1), was produced. Regarding the internal olefin having 16 carbon atoms, the internal olefin was produced according to Production Example C of JP-A-2014-76988. The double bond distribution of the internal olefin is as follows.
The mass ratio of internal olefins having double bonds at the following positions is 1-position/2-position/3-position/4-position/5-position/6-position/7-position/8-position=2.3%/23.6 %/18.9%/17.5%/13.7%/11.2%/6.4%/6.4% (total 100% by mass)

The double bond distribution of the internal olefin a1 was measured by gas chromatography (hereinafter abbreviated as GC). Specifically, the internal olefin was reacted with dimethyl disulfide to obtain a dithio derivative, and each component was separated by GC. As a result, the ratio of the double bond distribution of the internal olefin was obtained from the respective peak areas, and the ratio was taken as the mass ratio. In the case of olefins with 16 carbon atoms, internal olefins with a double bond at the 7-position and internal olefins with a double bond at the 8-position cannot be distinguished structurally, but can be distinguished when sulfonated. For convenience, the values obtained by dividing the amount of internal olefins having a double bond at the 7-position by 2 are shown in each column.
The equipment and analysis conditions used for the measurements are as follows. GC apparatus "HP6890" (manufactured by HEWLETT PACKARD), column "Ultra-Alloy-1HT capillary column" (30 m × 250 μm × 0.15 μm, manufactured by Frontier Lab Co., Ltd.), detector (flame ion detector (FID)) , injection temperature 300° C., detector temperature 350° C., He flow rate 4.6 mL/min

[(a-1) Production of internal olefin sulfonic acid having 16 carbon atoms]
The internal olefin a1 was subjected to a sulfonation reaction by passing sulfur trioxide gas and cooling water at 20°C through the outer jacket of the reactor using a thin-film sulfonation reactor having an external jacket. The SO ₃ /internal olefin molar ratio during the sulfonation reaction was set at 1.09. The resulting sulfonated product was added to an alkaline aqueous solution prepared with potassium hydroxide in an amount 1.5 mol times the theoretical acid value, and neutralized at 30° C. for 1 hour while stirring. The neutralized product was hydrolyzed by heating in an autoclave at 160° C. for 1 hour to obtain a crude product of potassium internal olefin sulfonate having 16 carbon atoms. The crude product was evaporated to dryness to give potassium internal olefin sulfonate. This is designated as (a-1).

<Ingredients>
In Examples and Comparative Examples, the following components were used [(a) component]
(a-1): Potassium salt of internal olefin sulfonate having 16 carbon atoms produced by the above method

[(b) component]
(b-1): Addition of 0.6 mol of propylene oxide to 1 mol of a natural alcohol having an alkyl chain of C8:C10:C12=5:5:90 (mass ratio, the number following C means the number of carbon atoms) The obtained product was sulfated with sulfur trioxide and then neutralized with an aqueous sodium hydroxide solution (diluted with water 10% and neutralized until the pH reached 11).
(b-2): Polyoxyethylene (average addition number of moles 3) sodium lauryl ether sulfate (manufactured by Kao Corporation)

[Component (c)]
Component (c-1): Mixed fatty acid (manufactured by Kao Corporation) The carbon number composition of saturated fatty acid (all linear) is 10 carbons/12 carbons/14 carbons/16 carbons/18 carbons=1 /57/22/10/3 (mass ratio), the remainder is unsaturated fatty acids, and the composition is linoleic acid/linoleic acid=6/1 (mass ratio).

<Preparation of detergent composition for textile products>
Using the above ingredients, detergent compositions for textiles shown in Tables 1 to 3 were prepared and evaluated for the following items. The results are shown in Tables 1-3.
Specifically, the detergent composition for textiles was prepared as follows. A Teflon (registered trademark) stirrer piece having a length of 5 cm was put into a glass beaker having a capacity of 200 mL, and the mass was measured. After adjusting the pH by adding 10 g of ion-exchanged water at 20°C, component (c), and a predetermined amount of sodium hydroxide so that the final pH is 8.0, the mixture is placed in a water bath at 40°C at 100 r/min. Stirred for 5 minutes. Sodium hydroxide was used in the form of a 10% by mass sodium hydroxide aqueous solution. Next, in a water bath at 25°C, components (a) and (b) were added and stirred at 100 r/min for 20 minutes. Next, ion-exchanged water was added so that the mass of the contents was 100 g, and the mixture was stirred again at 100 r/min for 30 seconds to obtain detergent compositions for textile products shown in Tables 1-3.
In addition, in the preparation of the detergent composition for textiles, for each composition in the table, the same operation as described above was performed except that water was used instead of the component (c), and the component (c) was not included. A composition was prepared.

<Method for measuring pH>
A pH meter (pH/ion meter F-23, manufactured by HORIBA) is connected to a combined electrode for pH measurement (glass-sliding sleeve type, manufactured by HORIBA), and the power is turned on. A saturated potassium chloride aqueous solution (3.33 mol/L) is used as the pH electrode internal liquid. Next, pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) are each filled in a 100 mL beaker, and 25 C. for 30 minutes. A pH measuring electrode is immersed in a standard solution adjusted to a constant temperature for 3 minutes, and calibrated in the order of pH 6.86→pH 9.18→pH 4.01. A sample to be measured is adjusted to 25° C., the electrode of the pH meter is immersed in the sample, and the pH is measured after 1 minute.

<Method for measuring the German hardness of water>
〔reagent〕
0.01 mol/l EDTA/2Na solution: 0.01 mol/l aqueous solution of disodium ethylenediaminetetraacetate (solution for titration, 0.01 M EDTA-Na2, manufactured by SIGMA-ALDRICH)
・Universal BT indicator (product name: Universal BT, manufactured by Dojindo Laboratories)
- Ammonia buffer solution for hardness measurement (solution of 67.5 g of ammonium chloride dissolved in 570 ml of 28 w/v% ammonia water and made up to 1000 ml with deionized water)
[Measurement of hardness]
(1) Collect 20 ml of water as a sample in a conical beaker with a whole pipette.
(2) Add 2 ml of ammonia buffer for hardness measurement.
(3) Add 0.5 ml of Universal BT indicator. Confirm that the solution after the addition is reddish purple.
(4) A 0.01 mol/l EDTA·2Na solution is added dropwise from a burette while shaking the conical beaker well, and the end point of the titration is when the sample water turns blue.
(5) Calculate the total hardness by the following formula.
Hardness (°dH) = T x 0.01 x F x 56.0774 x 100/A
T: Titration volume (mL) of 0.01 mol/l EDTA/2Na solution
A: Sample volume (20 mL, volume of water to be sampled)
F: Factor of 0.01 mol/l EDTA/2Na solution

<Evaluation method for detergency>
(1) Preparation of model sebum-artificially soiled cloth A model sebum-artificially soiled cloth was prepared by adhering a model sebum-artificially contaminated liquid having the following composition to a cloth. Adhesion of the model sebum artificial contaminant liquid to the cloth was performed by printing the artificial contaminant liquid on the cloth using a gravure roll coater. The step of attaching the model sebum artificial staining solution to the cloth to prepare the model sebum artificial staining solution was performed with a gravure roll cell capacity of 58 cm ³ /m ² , a coating speed of 1.0 m/min, a drying temperature of 100° C., and a drying time of 1 min. rice field. Cotton 2003 (manufactured by Tanigashira Shoten) was used as the cloth.
* Composition of model sebum artificial contaminant liquid: 0.4% by mass of lauric acid, 3.1% by mass of myristic acid, 2.3% by mass of pentadecanoic acid, 6.2% by mass of palmitic acid, 0.4% by mass of heptadecanoic acid, stearin Acid 1.6% by mass, oleic acid 7.8% by mass, triolein 13.0% by mass, n-hexadecyl palmitate 2.2% by mass, squalene 6.5% by mass, egg white lecithin liquid crystal 1.9% by mass , Kanuma red clay 8.1% by mass, carbon black 0.01% by mass, water balance (total 100% by mass)

(2) Evaluation of detergency Five pieces of the model sebum-artificially stained cloth (6 cm x 6 cm) prepared above were washed at 85 rpm for 5 or 10 minutes using a tergotometer (Ueshima, MS-8212). The washing conditions were such that the concentration of the detergent composition for textiles listed in Tables 1 to 3 or the concentration of the composition not containing the component (c) corresponding to each composition was 0.033% by mass. City water (3.5° dH, calculated by the above water hardness measurement method, 20°C) was injected, and washing was performed at a water temperature of 20°C. After washing, it was rinsed with city water (20° C.) for 3 minutes. The cleaning rate (%) was measured by the following method, and the average value of 5 sheets was obtained. The reflectance at 550 nm of the raw cloth before staining and before and after washing was measured with a colorimetric color difference meter (manufactured by Nippon Denshoku Co., Ltd., Z-300A), and the washing rate (%) was obtained by the following formula (in the table is the average value of the cleaning rate of 5 sheets).
Cleaning rate (%) = 100 x [(reflectance after cleaning-reflectance before cleaning)/(reflectance of raw fabric-reflectance before cleaning)]

(3) Calculation of Cleaning Rate Improvement Rate The cleaning rate improvement rate was calculated based on the following formula. It is preferable that the cleaning rate improvement rate is high. The results are shown in Tables 1-3.
Cleaning rate improvement rate (%) = [cleaning rate of composition containing component (c)/cleaning rate of composition not containing component (c)] x 100-100

Claims (2)

Containing the following components (a), (b) and (c),
The mass ratio of the content of component (c) to the total content of components (a) and (b), component (c)/[component (a) + component (b)], is 0.01 or more and 1 is less than .0,
(a) component / (b) component, which is the mass ratio of the content of component (a) to the content of component (b), is 0.1 or more and 10 or less.
A detergent composition for textiles.
(a) component: internal olefin sulfonate having 16 to 24 carbon atoms (b) component: polyoxyalkylene alkyl ether sulfate (c) component: fatty acid having 10 to 20 carbon atoms or a salt thereof The detergent composition for textiles according to claim 1 , wherein the component (b) is a sulfate represented by the following general formula (1).
RO-(AO) _n - _SO3M (1)
[Wherein, R is an aliphatic hydrocarbon group having 12 to 16 carbon atoms, AO group is one or more groups selected from alkyleneoxy groups having 2 or 3 carbon atoms, n is an average The number of added moles is 0.5 or more and 5 or less, and M is a cation. ]