Method for producing a detergent composition

Abstract

To provide a method for producing a detergent composition having excellent handleability even if a sodium alkylbenzenesulfonate produced using a solid acid catalyst is used.SOLUTION: A method for producing a detergent composition comprises following Step 1. Step 1; a step of preparing a slurry containing following components (a) to (c). The component (a): a linear or branched-chain sodium alkylbenzenesulfonate (LAS) having an average carbon chain length of 10 or more and 15 or less (provided that the component (a) contains 2-LAS and the amount of 2-LAS in the component (a) is 20 mass% or more); the component (b): a sodium alkylsulfate (AS) having a carbon chain length of 7 or more and 15 or less; the component (C): water (provided that a mass ratio of [the component (b)] / [the component (a)] blended in the slurry is 0.08 or more and 5 or less).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for producing a detergent composition containing sodium alkylbenzenesulfonate.

Background Art

[0002] From the viewpoints of economy and foaming property, many detergent compositions containing detergent particles mainly composed of an anionic surfactant, such as sodium alkylbenzenesulfonate, are produced.

[0003] The mainstream of the current method for producing sodium alkylbenzenesulfonate is a method using olefin as a raw material and hydrogen fluoride as a catalyst (Patent Document 1). However, since hydrogen fluoride is a toxic substance, a production method using another catalyst, such as a solid acid catalyst (DETAL method), is also known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present inventors considered preparing detergent particles using sodium alkylbenzenesulfonate produced using a solid acid catalyst. However, it was found that when sodium alkylbenzenesulfonate produced using a solid acid catalyst is used, the slurry thickens, and problems such as clogging in the piping may occur.

[0006] Therefore, the present invention relates to providing a method for producing a detergent composition that is excellent in handling even when sodium alkylbenzenesulfonate produced using a solid acid catalyst is used.

Means for Solving the Problems

[0007] The present invention relates to the following [1] to [6]. [1] A method for producing a detergent composition including the following step 1. Step 1: A step of preparing a slurry containing the following components (a) to (c). Component (a): Sodium linear or branched alkylbenzene sulfonate (LAS) having an average carbon chain length of 10 or more and 15 or less (however, component (a) contains 2-LAS, and the amount of 2-LAS in component (a) is 20% by mass or more). Component (b): Sodium alkyl sulfate (AS) having a carbon chain length of 7 or more and 15 or less Component (c): Water (However, the mass ratio of [component (b)] / [component (a)] incorporated into the slurry is 0.08 or more and 5 or less). [2] The production method according to [1] above, further including the following step 2. Step 2: A step of spray-drying the slurry obtained in step 1 to prepare detergent particles. [3] The production method according to [1] or [2] above, wherein the slurry in step 1 further contains the following component (d) in an amount of 0.1% by mass or more and 10% by mass or less. Component (d): Cationic surfactant [4] The production method according to any one of [1] to [3] above, wherein the slurry in step 1 further contains the following component (e) in an amount of 0.1% by mass or more and 50% by mass or less. Component (e): Inorganic salt [5] The production method according to any one of [1] to [4] above, wherein the slurry in step 1 further contains the following component (f) in an amount of 0.1% by mass or more and 10% by mass or less. Component (f): Water-soluble polymer [6] Use of the detergent composition obtained by the production method according to any one of [1] to [5] above as a laundry detergent. [Advantages of the Invention]

[0008] According to the present invention, it is possible to provide a method for producing a detergent composition that is excellent in handling even when sodium alkylbenzenesulfonate produced using a solid acid catalyst is used.

Mode for Carrying Out the Invention

[0009] When the present inventors examined this thickening phenomenon, they found that there is a difference in the isomer distribution of alkylbenzenesulfonic acid between sodium alkylbenzenesulfonate produced by a method using hydrogen fluoride as a catalyst and sodium alkylbenzenesulfonate produced by the DETAL method. And, in sodium alkylbenzenesulfonate produced by the DETAL method, since there is a large amount of highly crystalline 2-LAS, it was presumed that the ratio of 2-LAS affects the viscosity of the slurry containing sodium alkylbenzenesulfonate. The present inventors further proceeded with the study and found that even when sodium alkylbenzenesulfonate having a large amount of 2-LAS is blended as a constituent component of the slurry, the thickening of the slurry can be surprisingly suppressed by blending a specific sodium alkyl sulfate into the slurry, and thus completed the present invention.

[0010] The production method of the present invention is characterized by including Step 1 shown below.

[0011] 1. Step 1: Step of preparing a slurry Step 1 is a step of preparing a slurry containing components (a) to (c).

[0012] Component (a) Component (a) is sodium alkylbenzenesulfonate (LAS) having a linear or branched alkyl chain with an average carbon chain length of 10 or more and 15 or less. However, component (a) contains 2-LAS, and the amount of 2-LAS in component (a) is 20% by mass or more. In this specification, for convenience, LAS is abbreviated to include not only those having a linear alkyl group but also those having a branched alkyl group.

[0013] Component (a) is composed of various isomers of LAS. 2-LAS is one of the isomers of LAS and has a structure in which a benzenesulfonic acid group is bonded to the second carbon atom of the alkyl chain of LAS. The following structural formula is an example of 2-LAS.

[0014]

Chemical formula

[0015] The inventors of the present invention have found that depending on the method for producing LAS, the proportion of isomers is different, and the higher the proportion of 2-LAS, the higher the viscosity of the prepared slurry.

[0016] The production method of the present invention is a method capable of suppressing an increase in the viscosity of the slurry even when the proportion of 2-LAS in component (a) is large, specifically, when the amount of 2-LAS in component (a) is 20% by mass or more. Therefore, in the production method of the present invention, from the viewpoint of using LAS produced by the DETAL method as it is, the amount of 2-LAS in component (a) is preferably 25% by mass or more, more preferably 30% by mass or more. On the other hand, from the same viewpoint, it is preferably 50% by mass or less, more preferably 40% by mass or less.

[0017] The alkyl chain in the LAS of component (a) is linear or branched, and its average carbon chain length is 10 or more and 15 or less. From the viewpoint of detergency, the average carbon chain length is preferably 12 or more, and from the viewpoint of detergency, it is preferably 14 or less.

[0018] From the viewpoint of detergency, the amount of component (a) in the slurry in Step 1 is preferably 8% by mass or more, more preferably 9% by mass or more, still more preferably 10% by mass or more, still more preferably 12% by mass or more, still more preferably 14% by mass or more. On the other hand, from the viewpoint of the drying property during spray drying, the amount of component (a) in the slurry is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, still more preferably 20% by mass or less.

[0019] Component (b) Component (b) is sodium alkyl sulfate (AS) having a carbon chain length of 7 or more and 15 or less. From the viewpoint of reducing the viscosity of the slurry, the carbon chain length is preferably 8 or more, more preferably 9 or more, still more preferably 10 or more. On the other hand, from the same viewpoint, the carbon chain length is preferably 14 or less, more preferably 12 or less. In the present specification, the carbon chain length of AS refers to the number of carbon atoms constituting the alkyl group. AS having a desired carbon chain length is easily available as a commercial product.

[0020] The amount of component (b) in the slurry in Step 1 is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more from the viewpoint of ensuring the LAS content for detergency. On the other hand, from the viewpoint of detergency, the amount of component (b) in the slurry is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, still more preferably 20% by mass or less, still more preferably 15% by mass or less, still more preferably 10% by mass or less.

[0021] Mass ratio of [component (b)] / [component (a)] formulated in the slurry The mass ratio of [component (b)] / [component (a)] formulated in the slurry is preferably 0.08 or more, more preferably 0.1 or more, still more preferably 0.2 or more, still more preferably 0.5 or more from the viewpoint of slurry handling. On the other hand, from the viewpoint of detergency, the mass ratio is preferably 5 or less, more preferably 4 or less, still more preferably 2 or less, still more preferably 1 or less.

[0022] Component (c) Component (c) is water. Water serves as a medium during slurry preparation. The amount of water in the slurry in Step 1 is preferably 15% by mass or more, more preferably 20% by mass or more, still more preferably 30% by mass or more, and even more preferably 35% by mass or more from the viewpoint of slurry handling. On the other hand, from the viewpoint of fuel cost during spray drying, the amount of water in the slurry is preferably 43% by mass or less, more preferably 42% by mass or less, and still more preferably 40% by mass or less.

[0023] Component (d) Component (d) is a cationic surfactant. It is preferable that the slurry in Step 1 of the production method of the present invention further contains Component (d) because effects such as sterilization and antibacterial properties during washing can be expected. As the cationic surfactant, any known one in the field of detergent compositions can be used without limitation. However, cationic surfactants preferably used in the production method of the present invention include, for example, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, dodecylbenzyldimethylammonium chloride, tetradecylbenzyldimethylammonium chloride, didecyldimethylammonium ethyl sulfate, and dioctyldimethylammonium ethyl sulfate. Among these, hexadecyltrimethylammonium chloride is preferable.

[0024] The blending amount of Component (d) in the slurry in Step 1 is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and still more preferably 1.0% by mass or more from the viewpoint of exerting the above-described desired effects. On the other hand, from the viewpoint of detergency, the amount of Component (d) in the slurry is preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 3% by mass or less, even more preferably 2% by mass or less, and even more preferably 1.5% by mass or less.

[0025] Component (e) Component (e) is an inorganic salt. It is preferable that the slurry in Step 1 of the production method of the present invention further contains Component (e) because an effect of ensuring the particle strength of spray-dried particles can be expected.

[0026] As the component (e), any known one in the field of detergent compositions can be used without limitation. For example, alkali metal salts having a hydroxyl group, a carbonate group, or a hydrogen carbonate group; silicates; alkali metal salts having a sulfate group or a sulfite group, etc. may be mentioned. More specifically, sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, potassium carbonate, sodium silicate, potassium silicate, sodium sulfate, sodium chloride, sodium sulfite, potassium sulfate, etc. may be mentioned. These may be blended alone or in combination of two or more.

[0027] From the viewpoint of exerting the above-mentioned desired effect, the amount of the component (e) in the slurry in Step 1 is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and still more preferably 5.0% by mass or more. On the other hand, from the viewpoint of reducing the water-insoluble matter during washing, the amount of the component (e) in the slurry is preferably 50% by mass or less, more preferably 45% by mass or less, still more preferably 40% by mass or less, still more preferably 35% by mass or less, still more preferably 33% by mass or less, still more preferably 30% by mass or less, and still more preferably 20% by mass or less.

[0028] Component (f) The component (f) is a water-soluble polymer. It is preferable that the slurry in Step 1 of the production method of the present invention further contains the component (f) because an effect of improving the particle strength of the detergent particles prepared in Step 2 can be expected. As the water-soluble polymer, any known one in the field of detergent compositions can be used without limitation. For example, carboxylic acid-based polymers (such as polyacrylic acid), soluble starch, saccharides, amorphous silicates, carboxymethyl cellulose, polyethylene glycol may be mentioned. These may be blended alone or in combination of two or more. Preferably, it is one or more components selected from the group consisting of carboxymethyl cellulose, polyethylene glycol, and polyacrylic acid.

[0029] From the perspective of achieving the desired effects described above, the amount of component (f) in the slurry in Process 1 is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more. On the other hand, from the perspective of suppressing sedimentation separation of the slurry during production, the amount of component (f) in the slurry is preferably 10% by mass or less, more preferably 7% by mass or less, still more preferably 5% by mass or less, and even more preferably 4% by mass or less.

[0030] Other components that may be added to the slurry The slurry may further contain other components that can be incorporated into a laundry detergent, such as AS with a carbon chain length of less than 7, AS with a carbon chain length exceeding 15, sodium polyoxyethylene alkyl ether sulfate, alpha-sulfo fatty acid ester salts, fatty acid methyl ester ethoxylates, polyoxyethylene alkyl ethers; chelating agents may also be further added. Such components may be added singly or in combination of two or more. The amount of such components added to the slurry as the total amount is preferably 0.1 part by mass or more, more preferably 0.5 part by mass or more, based on 100 parts by mass of the total amount of the slurry. On the other hand, it is preferably 5 parts by mass or less, more preferably 3 parts by mass or less.

[0031] Method for preparing the slurry The slurry can be prepared by mixing the above components. The mixing conditions are not particularly limited. For example, from the perspective of uniformly stirring each component, the temperature of the slurry is preferably 30°C or higher, and from the perspective of suppressing thermal decomposition of each component, the temperature of the slurry is preferably 80°C or lower.

[0032] Viscosity of the slurry The viscosity of the slurry prepared by the production method of the present invention can be reduced. The specific viscosity of the slurry is not particularly limited, but from the perspective of handling, the viscosity at 60°C is preferably 2700 mPa·s or less, more preferably 2000 mPa·s or less, and still more preferably 1500 mPa·s or less. On the other hand, from the perspective of suppressing the separation and sedimentation of the slurry during production, the viscosity of the slurry at 60°C is preferably 500 mPa·s or more, more preferably 800 mPa·s or more, and still more preferably 1000 mPa·s or more. The viscosity of the slurry is determined by measuring it according to the method described in the examples below.

[0033] 2. Step 2: Step of preparing detergent particles Various methods can be mentioned for the method of manufacturing a detergent composition using the slurry prepared in Step 1, but a method having a step of preparing detergent particles by spray-drying the slurry is preferred. Therefore, the manufacturing method of the present invention preferably further includes the following Step 2. Step 2: Step of preparing detergent particles by spray-drying the slurry obtained in Step 1.

[0034] Conditions for spray-drying The conditions for spray-drying are not particularly limited as long as they do not substantially affect each component contained in the slurry, and generally used spray-drying conditions can be adopted.

[0035] The spray-drying temperature is preferably 150°C or higher, more preferably 160°C or higher, from the perspective of improving the drying efficiency, and on the other hand, preferably 300°C or lower from the perspective of suppressing decomposition.

[0036] As the apparatus for performing spray-drying, a generally known spray-drying tower can be used, and the exhaust air temperature of the spray-drying tower is preferably adjusted to be 80 to 130°C.

[0037] Physical properties of detergent particles The physical properties of the detergent particles prepared in Step 2 are described below. The fluidity of the detergent particles is evaluated as the flow time measured by the method described in the examples below. The shorter the flow time, the higher the fluidity of the detergent particles. Particles with higher fluidity are preferred because they are less likely to cause clogging and the like.

[0038] The bulk density of the detergent particles is preferably 200 g / L or more, more preferably 350 g / L or more, and preferably 1,200 g / L or less, more preferably 1,000 g / L or less. The bulk density is measured by the method defined in JIS K 3362.

[0039] The average particle diameter of the detergent particles is preferably 150 μm or more, more preferably 200 μm or more, and preferably 600 μm or less, more preferably 500 μm or less, from the viewpoints of handling and appearance. The average particle diameter is calculated as the median diameter from the weight fraction according to the sieve size after vibrating for 5 minutes using the standard sieves (mesh openings 2,000 to 125 μm) of JIS K 8801.

[0040] Surface modification For the purpose of further improving the flow characteristics and storage stability of the detergent particles prepared in Step 2, a step of surface-modifying the detergent particles by adding a surface modifier to the detergent particles (surface modification step) may be performed. Examples of the surface modifier include one or more selected from the group consisting of zeolite, tripolyphosphate, and clay minerals.

[0041] Examples of the clay minerals include talc, pyrophyllite, smectite (such as saponite, hectorite, sauconite, stevensite, montmorillonite, beidellite, nontronite, etc.), vermiculite, mica (such as phlogopite, biotite, zinnwaldite, muscovite, paragonite, celadonite, glauconite, etc.), chlorite (such as clinochlore, chamosite, nimite, pennantite, sudoite, donbassite, etc.), brittle mica (such as clintonite, margarite, etc.), surolite, serpentine minerals (such as antigorite, lizardite, chrysotile, amesite, cronstedtite, berthierine, greenalite, garnierite, etc.), kaolin minerals (such as kaolinite, dickite, nacrite, halloysite, etc.), and the like. These can be used alone or in combination of two or more kinds.

[0042] From the viewpoint of coating property, the average particle diameter of the surface modifier is desirably 1 / 10 or less of the average particle diameter of the detergent particles. If the average particle diameter is within this range, it is possible to avoid a decrease in solubility and expect a sufficient effect of improving the anti-caking property. The average particle diameter of the surface modifier can be measured, for example, using a laser diffraction / scattering particle size distribution measuring device having a dry measurement unit. Specifically, it can be measured by connecting a dry measurement unit "G0310630" to "Partica LA-950" manufactured by Horiba, Ltd. using the Mie scattering method.

[0043] From the viewpoint of flow characteristics, the amount of the surface modifier is preferably 2 parts by mass or more, more preferably 2.5 parts by mass or more, based on 100 parts by mass of the detergent particles. The preferable upper limit thereof is 20 parts by mass or less, more preferably 15 parts by mass or less, based on 100 parts by mass of the detergent particles.

[0044] There is no particular regulation on the conditions of the surface modification method, and conditions for uniformly distributing the surface modifier on the surface of the detergent particles as much as possible are preferable. As the surface modification device, a Lodige mixer or a high-speed mixer that can simultaneously apply a strong stirring force and a cutting force and perform uniform surface modification is preferably used.

[0045] 3. Detergent Composition In the production method of the present invention, the detergent particles themselves obtained by drying the slurry prepared in Step 1 by a known method (preferably the detergent particles themselves prepared through Step 2, more preferably the detergent particles themselves further subjected to surface modification treatment) can be used as the detergent composition. Alternatively, a composition obtained by mixing such detergent particles with components known in laundry detergents (for example, crystalline aluminosilicate, enzyme, sodium percarbonate, alkali agent) can be used as the detergent composition in the production method of the present invention. Such a detergent composition can be used, for example, as a laundry detergent.

Example

[0046] Hereinafter, the production method of the present invention will be specifically described with reference to examples. It should be noted that these examples are merely illustrative of the present invention and do not imply any limitation. Parts in the examples are by mass unless otherwise specified. Note that "normal pressure" means 101.3 kPa and "normal temperature" means 25°C.

[0047] Example 1 Step 1: Preparation of slurry 35.785 L of water was put into a mixing tank and heated. After the water temperature reached 45°C, 20.2 kg of LAS (containing 30% by mass of 2-LAS), 2.24 kg of AS, 1.12 kg of quaternary ammonium chloride, 3.28 kg of sodium silicate, 29.54 kg of sodium sulfate, 0.34 kg of carboxymethyl cellulose (CMC), 0.47 kg of polyethylene glycol, and 7.025 kg of a 40% aqueous solution of sodium polyacrylate were added and stirred for 20 minutes. The viscosity of the slurry thus prepared at 60°C was 1980 mPa·s.

[0048] Step 2: Spray drying of the slurry The slurry prepared above was spray-dried as follows to prepare detergent particles. That is, the slurry was supplied by a pump to a spray drying tower (countercurrent type), and spraying was performed at a spraying pressure of 2.5 MPa from a pressure spray nozzle installed near the top of the tower. The high-temperature gas supplied to the spray drying tower was supplied at a temperature of 230 °C from the lower part of the tower and discharged at 120 °C from the top of the tower to obtain detergent particles.

[0049] Examples 2 to 3, Comparative Examples 1 to 5, and Reference Example 1 In the same manner as in Example 1, each component was blended so as to have the mass ratios shown in Table 1 to prepare respective slurries. The viscosities of the respective slurries were also measured in the same manner as in Example 1. In Reference Example 1, LAS having 16% by mass of 2-LAS in component (a) was used. This LAS corresponds to LAS produced by a method using hydrogen fluoride as a catalyst. The obtained slurries were spray-dried in the same manner as in Step 2 of Example 1 to obtain detergent particles.

[0050] Details of the main components in the examples and the like are as follows. Sodium alkyl sulfate (AS): manufactured by Kao Corporation ([alkyl group carbon chain length of 12] / [[alkyl group carbon chain length of 14]=55 / 35 (mass ratio)) Sodium polyoxyethylene alkyl ether sulfate (ES): manufactured by Kao Corporation; trade name: Emal 270J Carboxymethyl cellulose (CMC): manufactured by Nippon Paper Industries Co., Ltd.; trade name: B2B Polyethylene glycol (PEG): manufactured by Mitsui Chemicals, Inc.; trade name: PEG 13000-L60 (mass average molecular weight 1300) Sodium polyacrylate: manufactured by Kao Corporation; trade name: Poi's 536 (mass average molecular weight 10,000) Quaternary ammonium chloride: hexadecyltrimethylammonium chloride

[0051] Regarding LAS, in sodium dodecylbenzenesulfonate manufactured by Kao Corporation, by appropriately changing the production conditions, those containing 30% by mass, 26.5% by mass, 23% by mass, and 16% by mass of 2-LAS were prepared respectively. The amount of 2-LAS in LAS was determined by separating dodecylbenzene (LAB), which is the raw material before sulfonation of each LAS, by gas chromatography and obtaining the ratio from the peak area.

[0052] Viscosity of slurry The viscosity of the slurry was measured and determined under the conditions of a B-type viscometer (DVM-B type manufactured by TOKYO KEIKI), rotor No. 3, 60 r / min, and 60 °C.

[0053] Flowability of detergent particles The flowability of the detergent particle group was evaluated as the flow time. The flow time was defined as the time required for 100 mL of powder to flow out from the hopper for measuring bulk density specified by JIS K 3362. The flowability was evaluated according to the following criteria. ○: The time required for outflow was 6 seconds or less. △: The time required for outflow exceeded 6 seconds and was 10 seconds or less. ×: The time required for outflow exceeded 10 seconds.

[0054]

Table 1

[0055] *: The ratio of 2-LAS in LAS. The blending amounts of each component and the evaluation results are shown in Table 1. The amounts of each component in Table 1 are in mass %. Note that since the blending amounts of each component are rounded off, the total of each component may not be 100 mass %.

[0056] From Table 1, it was found that in the examples, the viscosity of the slurry was suppressed and the flowability of the obtained detergent particles was also good. On the other hand, in the examples without AS (Comparative Examples 1 to 3) and in the examples where the amount of AS relative to LAS (i.e., the value of (b) / (a) in Table 1) is small (Comparative Examples 4 to 5), it was found that the viscosity of the slurry was high and the fluidity of the obtained detergent particles was also poor. From Reference Example 1, it was confirmed that the slurry containing the alkylbenzene sulfonate produced using hydrogen fluoride as a catalyst by the conventional method had a low viscosity. This means that when using the alkylbenzene sulfonate produced by the conventional method, even those skilled in the art cannot recognize the increase in the viscosity of the slurry.

[0057] Test Examples 1 to 7 Using various ASs with different carbon chain lengths of the alkyl group, each component was blended so as to have the mass ratio shown in Table 2, and each slurry was prepared in the same manner as in Example 1, and the viscosity of each slurry was measured. In Test Example 7, a slurry was prepared without using AS.

[0058] Details of the main components in the test examples are as follows. AS (alkyl group with a carbon chain length of 6): Sodium hexyl sulfate (manufactured by Kanto Chemical Co., Inc.) AS (alkyl group with a carbon chain length of 8): Sodium octyl sulfate (manufactured by Fujifilm Wako Pure Chemical Corporation) AS (alkyl group with a carbon chain length of 10): Sodium decyl sulfate (manufactured by Tokyo Chemical Industry Co., Ltd.) AS (alkyl group with a carbon chain length of 12): Sodium dodecyl sulfate (manufactured by Fujifilm Wako Pure Chemical Corporation) AS (alkyl group with a carbon chain length of 14): Sodium tetradecyl sulfate (manufactured by Fujifilm Wako Pure Chemical Corporation) AS (alkyl group with a carbon chain length of 16): Sodium hexadecyl sulfate (manufactured by Fujifilm Wako Pure Chemical Corporation)

[0059]

Table 2

[0060] From Table 2, it was found that those with an alkyl chain carbon chain length of 8 to 14 in the alkyl sulfate had a remarkable effect of reducing the viscosity of the slurry. On the other hand, it was found that the slurry containing AS with a carbon chain length of 6 in Test Example 1 had a higher viscosity than the slurry without AS in Test Example 7. From this, it is suggested that even when AS with a carbon chain length of 7 is blended, the viscosity of the slurry decreases.

Industrial Applicability

[0061] The detergent composition obtained by the production method of the present invention can be suitably used as a laundry detergent.

Claims

1. A method for manufacturing a detergent composition, comprising the following steps 1 and 2. Step 1: A step of preparing a slurry containing the following components (a) to (c), wherein component (c) is 20% by mass or more. Component (a): Sodium linear or branched alkylbenzenesulfonate (LAS) having an average carbon chain length of 10 or more and 15 or less (however, component (a) contains 2-LAS, and the amount of 2-LAS in component (a) is 20% by mass or more and 50% by mass or less). Component (b): Sodium alkyl sulfate (AS) having a carbon chain length of 9 or more and 15 or less Component (c): Water (However, the mass ratio of [component (b)] / [component (a)] incorporated into the slurry is 0.08 or more and 5 or less.) Step 2: A step of spray-drying the slurry obtained in Step 1 to prepare detergent particles.

2. The manufacturing method according to Claim 1, wherein the slurry in Step 1 contains 8% by mass or more and 50% by mass or less of component (a).

3. The manufacturing method according to Claim 1 or 2, wherein the slurry in Step 1 contains 0.1% by mass or more and 50% by mass or less of component (b).

4. The manufacturing method according to any one of Claims 1 to 3, wherein the slurry in Step 1 contains 30% by mass or more and 43% by mass or less of component (c).

5. The manufacturing method according to any one of Claims 1 to 4, wherein the slurry in Step 1 further contains 0.1% by mass or more and 10% by mass or less of the following component (d). Component (d): Cationic surfactant

6. The manufacturing method according to any one of Claims 1 to 5, wherein the slurry in Step 1 further contains 0.1% by mass or more and 50% by mass or less of the following component (e). Component (e): Inorganic salt

7. The manufacturing method according to any one of Claims 1 to 6, wherein the slurry in Step 1 further contains 0.1% by mass or more and 10% by mass or less of the following component (f). Component (f): Water-soluble polymer

8. The manufacturing method according to any one of Claims 1 to 7, wherein the viscosity of the slurry obtained in Step 1 at 60 °C is 2700 mPa·s or less.

9. Use of the detergent composition obtained by the manufacturing method according to any one of Claims 1 to 8 as a laundry detergent.

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