Liquid laundry detergent composition

Abstract

To provide a liquid detergent composition for clothes that has viscosity suitable for application and washing, has excellent detergency, and also excels in dispersibility and solubility in water.SOLUTION: A liquid detergent composition for clothes contains (a) 5-30 mass% of a surfactant, (b) 2-20 mass% of an inorganic salt, and water, wherein (b) contains sodium sulfate, the proportion of sodium sulfate in (b) is at least 30 mass%, and the viscosity at 30°C is 2,000 mPa s to 100,000 mPa s.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a liquid detergent composition for clothing and a method for washing clothing.

Background Art

[0002] There are roughly two types of methods for washing textile products such as clothing: hand washing and machine washing. In recent years, although the popularity of washing machines has been increasing in the Asian region, hand washing is widely practiced due to factors such as detergency, economy, cultural background, and washing awareness. Hand washing allows the operator to check the degree of dirt removal while washing, making it suitable not only for removing overall dirt attached to the fibers but also for removing partial stains such as food spills. In hand washing, many operators use a cleaning solution obtained by dissolving a detergent, such as a powdered or liquid detergent, in water to wash the clothing.

[0003] In addition to being used for preparing the cleaning solution, the liquid detergent can also be directly applied to textile products. For example, in hand washing, during the operation, the liquid detergent can be applied to conspicuous dirty areas of the textile product and then rinsed, etc.

[0004] Patent Document 1 discloses a liquid detergent that contains about 5% to about 20% by weight of a surfactant system, the surfactant system contains an alkoxylated anionic surfactant having an alkoxylation degree of 0.20 to 1.75, the detergent has an injection viscosity of about 2500 mPa·s to about 6000 mPa·s at 20°C, and the ratio of the medium shear viscosity to the high shear viscosity is about 2 to about 1. The liquid detergent is said to be able to contain electrolytes such as sodium chloride.

[0005] Patent Document 2 discloses a surfactant composition obtained by mixing a predetermined ether sulfate salt containing an ethyleneoxy group and a predetermined ether sulfate salt containing an alkyleneoxy group having 3 or 4 carbon atoms. The surfactant composition is said to be able to further contain inorganic salts such as sodium chloride.

[0006] Patent Document 3 discloses a liquid detergent containing (A) a specific α-sulfo fatty acid alkyl ester salt, (B) an anionic surfactant other than (A), and (C) a betaine-type amphoteric surfactant. The liquid detergent may further contain a water-soluble inorganic salt such as magnesium sulfate. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Special Publication No. 2016-503833 [Patent Document 2] Japanese Patent Publication No. 2009-120664 [Patent Document 3] International Publication No. 2017 / 069017 [Overview of the project] [Problems that the invention aims to solve]

[0008] Liquid detergent compositions used for hand washing and other laundry applications offer advantages in terms of convenience, including good cleaning power and the ability to use a single formulation for both preparing the detergent solution and applying it for cleaning. Generally, a moderately high viscosity of the liquid detergent composition is considered desirable for application cleaning, but this raises concerns about reduced dispersibility and solubility when mixing with water to prepare the detergent solution.

[0009] The present invention provides a liquid laundry detergent composition that has a viscosity suitable for application and cleaning, excellent cleaning power, and also excellent dispersibility and solubility in water. [Means for solving the problem]

[0010] The present invention relates to a liquid laundry detergent composition containing (a) a surfactant [hereinafter referred to as component (a)] in an amount of 5% to 30% by mass, (b) an inorganic salt [hereinafter referred to as component (b)] in an amount of 2% to 20% by mass, and water, (b) Contains sodium sulfate as component, and the proportion of sodium sulfate in component (b) is 30% by mass or more. The viscosity at 30°C is between 2000 mPa·s and 100000 mPa·s. This relates to a liquid detergent composition for clothing.

[0011] Furthermore, the present invention relates to a method for washing clothes, wherein the clothes are washed with the liquid laundry detergent composition of the present invention. [Effects of the Invention]

[0012] The present invention provides a liquid laundry detergent composition that has a viscosity suitable for application and cleaning, excellent cleaning power, and also excellent dispersibility and solubility in water. [Modes for carrying out the invention]

[0013] (a) The component is a surfactant. (a) The components include one or more surfactants selected from anionic surfactants, nonionic surfactants, amphoteric surfactants, and cationic surfactants. The liquid laundry detergent composition of the present invention preferably contains an anionic surfactant as component (a). In this case, it may also contain a surfactant other than an anionic surfactant, and the surfactant other than an anionic surfactant is preferably a nonionic surfactant.

[0014] The liquid laundry detergent composition of the present invention contains component (a) in an amount of 5% by mass or more, preferably 7% by mass or more, more preferably 10% by mass or more, and 30% by mass or less, preferably 25% by mass or less, and more preferably 20% by mass or less, from the viewpoint of cleaning power and solubility. In this invention, the amount of each component, such as component (a), when preparing the liquid laundry detergent composition of the present invention can be considered as its respective content.

[0015] From the viewpoint of cleaning power, the liquid laundry detergent composition of the present invention contains an anionic surfactant as component (a), and preferably the proportion of the anionic surfactant in component (a) is 80% by mass or more, more preferably 85% by mass or more, more preferably 90% by mass or more, and 100% by mass or less, and this proportion may be 100% by mass.

[0016] The liquid laundry detergent composition of the present invention contains an anionic surfactant in an amount of preferably 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, from the viewpoint of cleaning power.

[0017] The liquid laundry detergent composition of the present invention preferably contains a polyoxyalkylene alkyl ether sulfate ester or a salt thereof (hereinafter referred to as AES) as component (a). Examples of oxyalkylene groups of AES include oxyethylene groups and oxypropylene groups. The average number of moles of oxyalkylene groups added to AES is preferably 1 to 4. The alkyl group of AES preferably has 8 or more carbon atoms, more preferably 10 or more carbon atoms, and even more preferably 18 or fewer carbon atoms, and more preferably 16 or fewer carbon atoms. When AES is a salt, an alkali metal salt is preferred, and a sodium salt is more preferred.

[0018] From the viewpoint of cleaning power, the liquid laundry detergent composition of the present invention contains AES as component (a), and preferably the proportion of AES in component (a) is 80% by mass or more, more preferably 85% by mass or more, more preferably 90% by mass or more, and 100% by mass or less, and this proportion may be 100% by mass.

[0019] The liquid laundry detergent composition of the present invention contains AES in an amount of 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, from the viewpoint of cleaning power and viscosity.

[0020] (b) The component is an inorganic salt. The liquid detergent composition for clothing of the present invention contains sodium sulfate as component (b), and in component (b), the proportion of sodium sulfate is 30% by mass or more, preferably 40% by mass or more, more preferably 50% by mass or more, and preferably 100% by mass or less. This proportion may be 100% by mass.

[0021] The inorganic salts of component (b) other than sodium sulfate can be selected from, for example, inorganic sulfates (excluding sodium sulfate) and inorganic chlorides. Examples of component (b) other than sodium sulfate include one or more selected from magnesium sulfate, lithium chloride, and sodium chloride.

[0022] From the viewpoint of viscosity control, the liquid detergent composition for clothing of the present invention contains component (b) at 2% by mass or more, preferably 2.5% by mass or more, more preferably 3% by mass or more, and 20% by mass or less, preferably 18% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and still more preferably 5% by mass or less.

[0023] From the viewpoint of achieving both detergency and solubility, (a) / (b), which is the mass ratio of the content of component (a) to the content of component (b) in the composition, is preferably 1 or more, more preferably 3 or more, and preferably 15 or less, more preferably 10 or less, and still more preferably 5 or less.

[0024] The liquid detergent composition for clothing of the present invention contains water. The content of water in the composition is preferably 50% by mass or more, more preferably 70% by mass or more, and preferably 90% by mass or less, more preferably 85% by mass or less.

[0025] The liquid detergent composition for clothing of the present invention is a liquid detergent composition for clothing prepared by blending component (a), component (b), and a component containing water, the blending amount of component (a) is 5% by mass or more and 30% by mass or less in all the blended components, the blending amount of component (b) is 2% by mass or more and 20% by mass or less in all the blended components, (b) Contains sodium sulfate as an ingredient, and the proportion of sodium sulfate in ingredient (b) is 30% by mass or more. The viscosity at 30°C is between 2000 mPa·s and 100000 mPa·s. It may be a liquid laundry detergent composition.

[0026] The liquid laundry detergent composition of the present invention may contain, as optional components, foaming agents, enzymes, pH adjusters, stabilizers, fluorescent dyes, fragrances, pigments, preservatives, solvents, and the like. Examples of pH adjusting agents include alkaline agents and acidic agents. Examples of alkaline agents include alkanolamines such as monoethanolamine, and alkanolamines having 1 to 5 carbon atoms. Examples of acidic agents include organic acids such as citric acid. It is preferable to use the pH adjusting agent so that the pH of the composition of the present invention falls within the range described later. Among the pH adjusting agents, alkanolamines such as monoethanolamine are preferred as alkaline agents from the viewpoint of cleaning power and stability. The liquid laundry detergent composition of the present invention contains alkanolamine, and more preferably monoethanolamine, in an amount of 0.2% by mass or more, more preferably 0.4% by mass or more, and preferably 2% by mass or less, and more preferably 1% by mass or less. Among the pH adjusting agents, organic acids such as citric acid are preferred as acidic agents from the viewpoint of cleaning power and stability. The liquid laundry detergent composition of the present invention contains organic acids, and more preferably citric acid, in an amount of 0.05% by mass or more, more preferably 0.1% by mass or more, and preferably 2% by mass or less, and more preferably 1% by mass or less.

[0027] The liquid laundry detergent composition of the present invention has a viscosity at 30°C of 2000 mPa·s or more, preferably 2500 mPa·s or more, more preferably 3000 mPa·s or more, and 100000 mPa·s or less, preferably 30000 mPa·s or less, more preferably 10000 mPa·s or less, and more preferably 5000 mPa·s or less, from the viewpoint of ease of measurement and solubility. This viscosity was measured using a B-type viscometer (VISCOMETER TVB-10, manufactured by Toki Sangyo Co., Ltd.) (30°C, M3, 12 rpm).

[0028] From the viewpoint of cleaning power, the liquid laundry detergent composition of the present invention has a pH at 30°C that is preferably 8 or higher, more preferably 9 or higher, and preferably 11 or lower, and more preferably 10.5 or lower. This pH may be measured, for example, using a pH meter (Horiba, Ltd., model number: D-71).

[0029] The liquid laundry detergent composition of the present invention is suitable for hand washing, i.e., for hand washing of clothing.

[0030] The liquid laundry detergent composition of the present invention is suitable as a coating-type composition. "Coating-type" may mean that it is used in a washing method in which it is applied directly to clothing for washing.

[0031] The present invention provides a method for washing clothes using the liquid laundry detergent composition of the present invention. In the cleaning method of the present invention, the liquid laundry detergent composition of the present invention can be applied to clothing, and then the clothing can be washed. In the washing method of the present invention, the liquid laundry detergent composition of the present invention is applied to the clothing, and the applied area can be hand-washed.

[0032] In the garment washing method of the present invention, it is preferable that the liquid detergent composition for garments of the present invention is diluted with water at the point where it is applied to the garment. Dilution can be performed, for example, by applying the liquid detergent composition for garments of the present invention to the garment and then bringing it into contact with water, or by applying the liquid detergent composition for garments of the present invention to a garment that is already wet. The dilution ratio is preferably 2 times or more, and preferably 100 times or less.

[0033] An example of a washing method using the liquid laundry detergent composition of the present invention is a method of washing clothes which involves (1) preparing a washing solution using the liquid laundry detergent composition of the present invention and water, (2) immersing clothes in the washing solution and applying the liquid laundry detergent composition of the present invention to the immersed clothes, and (3) hand washing the applied area of ​​the clothes.

[0034] Furthermore, another example of a washing method using the liquid laundry detergent composition of the present invention is a method of washing clothes which involves (1) preparing a washing solution using the liquid laundry detergent composition of the present invention and water, (2) immersing clothes in the washing solution and applying the liquid laundry detergent composition of the present invention to the immersed clothes, (3) hand washing the applied area of ​​the clothes, and (4) bringing the hand-washed clothes into contact with the washing solution and washing the clothes by hand.

[0035] Methods of hand washing include rubbing clothes by hand, rubbing clothes together by hand, and scrubbing clothes with tools such as brushes with bundles of fibers attached. [Examples]

[0036] Liquid laundry detergent compositions were prepared using the ingredients shown in Table 1, and the following evaluations were performed. The results are shown in Table 1. The ingredients used in the table are as follows. • ES(1): Polyoxyethylene (1 average mole of ethylene oxide added) lauryl ether sulfate sodium, Emal 170J (manufactured by Kao Corporation) • ES(2): Polyoxyethylene (average number of moles of ethylene oxide added: 2) lauryl ether sulfate sodium, Emal 270J (manufactured by Kao Corporation) • PEG (2 million): Polyethylene glycol with a weight-average molecular weight of 2 million. MEA: Monoethanolamine

[0037] (1) Evaluation of cleaning power <Creation of artificially contaminated cloth> Multiple artificial soiled cloths were created by gravure coating 100 mg of artificial dirt, consisting of the following composition, onto 6 cm x 6 cm cotton / polyester broadcloth blend dyed cloth (cotton / polyester ratio = 35 / 65, purchased from Tanigashira Shoten).

[0038] *Artificial dirt A composition containing the following A, B, C, D, and E was used as artificial sludge. Each mass % represents the proportion of each component in the final artificial sludge composition, and the amount of B was adjusted so that the total mass % was 100%. A: Adjusted oil (used in an amount such that the mass % of the artificial sludge consists of 0.44% lauric acid, 3.15% myristic acid, 2.35% pentadecanoic acid, 6.31% palmitic acid, 0.44% heptadecanoic acid, 1.6% stearic acid, 7.91% oleic acid, 13.33% triolein, 2.22% n-hexadecyl palmitate, and 6.66% squalene). B: Hard water obtained by weighing 105 mg of calcium chloride (dihydrate), dissolving it in distilled water to make 1,000 ml. C: Egg white lecithin liquid crystal 1.98% by mass (Egg white lecithin liquid crystal obtained by dissolving 11.37g of arginine hydrochloride, 4.20g of histidine, and 2.44g of serine in 80ml of distilled water, adjusting the pH to 5.0 with concentrated hydrochloric acid, and then thoroughly mixing this solution with egg white lecithin in a mixer) D: Kanuma red clay 8.11% by mass E: Carbon Black 0.025% by mass

[0039] <Coating and cleaning conditions> Four artificially soiled cloths were used, and 0.2 g of the liquid laundry detergent composition was directly applied to each cloth. The four soiled cloths coated with the liquid laundry detergent composition were placed in 1 L of hard water with a calcium carbonate equivalent of 179 mg / L (this hard water corresponds to 10°DH on the German hardness scale) and washed using a turgotometer under the following conditions. Soaking time: 30 minutes Washing time: 3 minutes, rotation speed: 180 rpm Water temperature 30℃ The cleaning power was measured by measuring the reflectance at 550 nm of the unstained fabric and before and after washing using a colorimeter (Z-300A, manufactured by Nippon Denshoku Co., Ltd.), and the cleaning rate (%) was calculated using the following formula. The cleaning rate of four soiled fabrics was calculated for each, and the average value is shown in the table. In this evaluation, a cleaning rate of 50% or higher is desirable. Cleaning rate (%) = 100 × [(Reflectance after cleaning - Reflectance before cleaning) / (Reflectance of the original fabric - Reflectance before cleaning)]

[0040] (2) Evaluation of solubility The liquid laundry detergent compositions shown in Table 1 were colored by adding 0.0005% by mass of a dye (Red No. 106). 100 ml of ion-exchanged water at 30°C was added to a 200 mL glass beaker and stirred with a stirring bar at a rotation speed of 150 pm. While stirring, 10 g of the colored liquid laundry detergent composition was added. The mixture was collected after 1 minute and 10 minutes. The absorbance (570 nm) of the collected water was measured using a microplate reader (TECAN). Dissolution rate The following definition is used. For this evaluation, a dissolution rate of 80% or higher is desirable. Dissolution rate (%) = 100 × [(Absorbance after 1 minute - Absorbance of deionized water) / (Absorbance after 10 minutes - Absorbance of deionized water)]

[0041] [Table 1]

Claims

1. A liquid laundry detergent composition containing (a) a surfactant [hereinafter referred to as component (a)] in an amount of 5% to 30% by mass, (b) an inorganic salt [hereinafter referred to as component (b)] in an amount of 2% to 20% by mass, and water, (a) The component contains a polyoxyalkylene alkyl ether sulfate ester or a salt thereof, in which the alkyl group has 10 to 16 carbon atoms and the average number of added oxyalkylene groups is 1 to 4, and the content of the polyoxyalkylene alkyl ether sulfate ester or a salt thereof in component (a) is 85% by mass or more. (b) Contains sodium sulfate as component, and the proportion of sodium sulfate in component (b) is 50% by mass or more. The pH at 30°C is between 8 and 11. The viscosity at 30°C is between 2000 mPa·s and 100000 mPa·s. A liquid detergent composition for clothing.

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

3. (a) A liquid laundry detergent composition according to claim 1 or 2, comprising an anionic surfactant as an ingredient.

4. (b) A liquid laundry detergent composition according to any one of claims 1 to 3, comprising one or more inorganic salts selected from magnesium sulfate, lithium chloride, and sodium chloride as a component.

5. A liquid laundry detergent composition according to any one of claims 1 to 4, wherein the mass ratio of the content of component (a) to the content of component (b), (a) / (b), is 1 or more and 15 or less.

6. The liquid laundry detergent composition according to any one of claims 1 to 5, wherein the content of the polyoxyalkylene alkyl ether sulfate ester or a salt thereof in the component is 90% by mass or more.

7. A liquid laundry detergent composition according to any one of claims 1 to 6, wherein the viscosity at 30°C is 3000 mPa·s or more.

8. A liquid laundry detergent composition according to any one of claims 1 to 7, for hand washing.

9. A liquid laundry detergent composition according to any one of claims 1 to 8, which is in the form of a coating agent.

10. A method for washing clothes, comprising washing clothes with a liquid laundry detergent composition according to any one of claims 1 to 9.

11. The method for washing clothes according to claim 10, wherein the liquid laundry detergent composition is applied to the clothes, and then the clothes are washed.

12. A method for washing clothes according to claim 10 or 11, comprising applying the liquid laundry detergent composition to the clothes and hand-washing the applied area.

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