JPH0873888A - Production of high bulk density granular detergent composition - Google Patents

Abstract

PURPOSE: To obtain the subject composition excellent in solubitlity and capable of preventing a salt of an α-sulfofatty acid ester from hydrolyzing under high temperature conditions by adding a bicarbonate salt into a specific detergent slurry, spray-drying the mixture, and further granulating the obtained particles. CONSTITUTION: This high bulk density granular detergent composition is obtained by preparing a detergent slurry containing (A) 1-15wt.% salt of an α-sulfo fatty acid ester, (B) 3-25wt.% alkylbenzenesulfonate salt, an α- olefinsulfonate salt or alkylsulfate salt, (C) 20-45wt.% carbonate salt and (D) 0.5-8wt.% bicarbonate salt, spray-drying the slurry, and granulating the obtained spray-dried particles to form a granular detergent, having >=0.5g/cc bulk density and containing the components A to D each having the above blending ratio. Furthermore, it is preferable that, for the preparation of the detergent slurry, a straight-chain ABS is neutralized with the carbonate salt or the carbonate salt and an alkali metal hydroxide to obtain a straight chain ABS salt, and then a raw material for the detergent containing the component A and a zeolite are blended with the straight-chain ABS salt.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a high bulk density granular detergent composition having excellent solubility. The present invention also provides a high bulk density granular detergent composition which inhibits hydrolysis of an α-sulfofatty acid ester salt, particularly in an aqueous detergent slurry solution, and has good fluidity of a product obtained by granulation. It relates to a manufacturing method.

[0002]

2. Description of the Related Art In conventional detergents, a bulking agent having a bulk density of 0.3 g is prepared by adding an extender (usually Glauber's salt is used) that hardly contributes to the cleaning performance to the composition and spray-drying it.
It was manufactured as bead-shaped hollow particles of about / cc.

However, since such a detergent has a low specific gravity and a low surfactant concentration, it costs a lot in transportation cost and requires a considerable space for storage and display. However, it is bulky and difficult to measure. Therefore, recently, a high bulk density granular detergent composition that can be washed with a small amount of detergent has become mainstream.

A drawback of this high bulk density granular detergent is that it is less soluble than conventional detergents. Regarding the improvement of the solubility, measures against it have been proposed in Japanese Patent Laid-Open No. 63-154799 and the like, but the effect of improving the solubility is insufficient with this, and further improvement of the solubility is desired. .

On the other hand, the α-sulfofatty acid ester salt is a surfactant excellent in detergency, especially in hard water resistance, and a method for producing a high bulk density detergent composition by incorporating this into a washing slurry has been reported. (For example, JP-A-63-154799). However, this detergent composition has a problem that the stability of the α-sulfo fatty acid ester salt is insufficient and the original detergency cannot be exhibited, and the stability of the α-sulfo fatty acid ester salt in a high temperature aqueous slurry solution is low. Was wanted.

[0006]

SUMMARY OF THE INVENTION The present invention provides a method for producing a high bulk density granular detergent composition having excellent solubility. Another object of the present invention is to prevent the hydrolysis of the α-sulfofatty acid ester salt under high temperature conditions to produce a high bulk density granular detergent composition.

[0007]

The first method for producing a high bulk density granular detergent composition of the present invention is described in the following (A), (B),
A detergent slurry containing components (C) and (D) is prepared,
Spray-dried particles obtained by spray-drying this slurry are granulated to have a bulk density of 0.5 g / cc or more and the following (A):
It is characterized in that it is a granular detergent containing the components (B), (C) and (D) in the following blending amounts, respectively.

(A) α-sulfofatty acid ester salt: 1 to
15% by weight (B) Alkylbenzenesulfonate, α-olefinsulfonate or alkylsulfate: 3 to 25% by weight, (C) Carbonate: 20 to 45% by weight, (D) Hydrogencarbonate: 0.5 ~ 8% by weight.

The second method for producing a high bulk density granular detergent composition of the present invention is to obtain a linear alkylbenzene sulfonic acid by neutralizing the linear alkylbenzene sulfonic acid with a carbonate or a carbonate and an alkali metal hydroxide. After this, α-
A detergent raw material containing a sulfo fatty acid ester salt and zeolite is blended to prepare a detergent slurry, and the slurry is spray-dried to obtain spray-dried particles.
A granular detergent comprising 5 g / cc or more and containing the following components (a), (b), (c) and (d) in the following blending amounts, respectively. (A) α-sulfofatty acid ester salt: 5 to 40% by weight,
(B) Linear alkylbenzene sulfonate: 3 to 25% by weight, (c) carbonate: 20 to 40% by weight, (d) zeolite: 10 to 25% by weight.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Since the present invention includes two inventions containing the α-sulfofatty acid ester salt described in claims 1 and 2 as a cleaning active ingredient, the following (1) described in claim 1 The invention and (2) invention (3) described in claim 2 will be described in the order of common matters.

(1) The component (A) α-sulfofatty acid ester salt of the invention according to claim 1 is obtained as a neutralized salt of a sulfonated product of a fatty acid lower alkyl ester, and is typically represented by the general formula (1) represented by I): alkyl or alkenyl group R _2: C ₁ ~C ₃ about a lower alkyl group M: counter ion)

The fatty acid residue R ₁ CHCO-- has a carbon number of 8 to
22 is suitable, and is preferably 10-18. A water-soluble salt is used as the counter ion, but an alkali metal salt,
The sodium salt is particularly preferable.

The α-sulfofatty acid ester salt is obtained by reacting with a sulfonating agent such as sulfuric anhydride using an ordinary sulfonation apparatus after obtaining a fatty acid lower alkyl ester having a predetermined carbon number by transesterification or esterification of fatty acid. Then, after aging and bleaching as needed, it is neutralized. Also,
It can also be obtained by lower alkyl esterification of a sulfonated fatty acid.

The α-sulfofatty acid ester salt of component (A) is contained in the cleaning composition in an amount of 1 to 15% by weight, preferably 2-1.
2% by weight is blended. If the content is less than 1% by weight, sufficient detergency cannot be obtained, while if it exceeds 15% by weight, the detergency reaches almost equilibrium.

As the surfactant other than the α-sulfo fatty acid ester salt as the component (B), alkylbenzene sulfonate (ABS) and α-olefin sulfonate (AO) are used.
S) or alkyl sulphates (AS) are used.

As the alkylbenzene sulfonate,
A linear alkylbenzene sulfonate having an alkyl group having an average carbon number of 8 to 16 is suitable. As the α-olefin sulfonate, a neutralized salt of a sulfonated α-olefin having an average carbon number of 10 to 20 is suitable. As the alkyl sulfate, those having an average carbon number of the alkyl group of 10 to 20 are preferable.

As the salt in the above-mentioned anionic surfactant, water-soluble salts such as alkali metal salts such as sodium salt and potassium salt are used. The anionic surfactant as the component (B) is incorporated in the cleaning composition in an amount of 5 to 25% by weight, preferably 10 to 20% by weight. If the content is less than 5% by weight, the detergency and the solubility are insufficient, while if it exceeds 25% by weight, the detergency reaches a nearly equilibrium.

Anionic surfactants other than those mentioned above can be added as optional components, for example, having an average carbon number of 10 to 10.
Examples thereof include alkyl or alkenyl ether sulfates having 20 linear or branched alkyl or alkenyl groups and having an average of 0.5 to 8 mol of ethylene oxide added.

As the carbonate as the component (C), water-soluble salts such as alcal metal salts such as sodium carbonate and potassium carbonate are used. Further, it is preferable to use sodium carbonate and potassium carbonate in combination, and it is desirable that the weight ratio is [sodium carbonate] / [potassium carbonate] = 90/10 to 40/6.
0, and more preferably 80/20 to 50/50. By using both in combination, the effect of improving the solubility due to the addition of bicarbonate can be further increased.

The carbonate as the component (C) is added to the detergent composition in an amount of 2
0 to 45% by weight, preferably 25 to 40% by weight is blended. If this blending amount is less than 20% by weight, the detergency is deteriorated, while if it exceeds 40% by weight, the effect is not enhanced.
It may only constrain the formulation of other ingredients.

The hydrogen carbonate as the component (D) is incorporated in the detergent composition in an amount of 0.5 to 8% by weight, preferably 1 to 5% by weight. If it is less than 0.5% by weight, the solubility is insufficient, while if it exceeds 8% by weight, the effect of improving the solubility reaches saturation.

In the present invention, the solubility can be improved by adding a small amount of hydrogen carbonate to a detergent system in which an α-sulfo fatty acid ester salt is mixed with other surfactant such as alkylbenzene sulfonate and carbonate. As mentioned above, this effect is remarkable in a system in which sodium carbonate and potassium carbonate are used in combination.

In the present invention according to claim 1, a detergent slurry containing the above-mentioned components (A) to (D) or an optional component such as zeolite is prepared and spray-dried to obtain spray-dried particles. To get Since the subsequent manufacturing process is the same as that of the invention described in claim 2, this will be described later in detail in the section of (3) Common matters.

(2) The content of the α-sulfofatty acid ester salt of the component (a) of the invention described in claim 2 is the same as that of the component (A) in the invention described in (1) claim 1. . The component (a), the α-sulfofatty acid ester salt, is incorporated in the detergent composition in an amount of 5 to 40% by weight, preferably 8 to 30% by weight. If the blending amount is less than 5% by weight, sufficient detergency cannot be obtained, while if it exceeds 40% by weight, production becomes difficult.

The component (b), an alkylbenzene sulfonate, is preferably a linear alkylbenzene sulfonate having an alkyl group having an average carbon number of 8 to 16, and the salt is an alkali metal such as sodium salt or potassium salt. Water-soluble salts such as salt are used.

The alkylbenzene sulfonate as the component (b) is contained in the detergent composition in an amount of 3 to 25% by weight, preferably 10%.
˜20% by weight. If the blending amount is less than 3% by weight, the detergency and the solubility are insufficient, while if it exceeds 25% by weight, the detergency reaches almost equilibrium.

Examples of the anionic surfactant other than the component (b) include the following. 1) an α-olefin sulfonate having an average carbon number of 10 to 20 (AOS), 2) an alkyl sulfate having an average carbon number of 10 to 20 (AS), 3) a linear or branched chain having an average carbon number of 10 to 20 An alkyl ether sulfate or an alkenyl ether sulfate (AES) having an alkyl group or an alkenyl group and having an average of 0.5 to 8 mol of ethylene oxide added thereto. Alkali metal salts such as sodium and potassium are usually suitable as counterions in these anionic surfactants.

As the carbonate as the component (c), a water-soluble salt such as an alcar metal salt such as sodium carbonate or potassium carbonate is used, and a detergent salt, an α-olefin sulfonate or an alkyl sulfate: 3 to 25 % By weight, (C) carbonate: 20 to 45% by weight, (D) hydrogen carbonate: 0.5 to 8% by weight.

The second method for producing a high bulk density granular detergent composition of the present invention comprises 20 to 40% by weight, preferably 20 to 35% by weight, of a linear alkylbenzene sulfonic acid in a carbonic acid composition.
Be compounded. If the blending amount is less than 20% by weight, the detergency is deteriorated. On the other hand, if the blending amount exceeds 40% by weight, the effect is not enhanced, and only the blending of other components may be restricted.

The zeolite as the component (d) is incorporated in the detergent composition of the present invention in an amount of 10 to 25% by weight, preferably 15 to 20% by weight. If the content is less than 10% by weight, the cleaning performance will not be satisfied, while if it exceeds 25% by weight, turbidity derived from zeolite will increase during rinsing and the rinsing property will be poor, such being undesirable.

The α-sulfofatty acid ester salt used as the component (a) in the present invention has an ester bond cleaved by hydrolysis during slurry blending in an alkaline coexisting system, is sparingly soluble in water and has a poor surfactant. There is a problem that the α-sulfofatty acid di-salt is likely to change. This hydrolysis is described, for example, in W. Stein et al. LAC
OS. 52.329 (1974), when an α-sulfofatty acid ester salt is allowed to stand in the alkaline region, a disalt is produced as shown in Chemical formula 2.

[0032]

Embedded image (R: alkyl group, alkenyl group)

Since the α-sulfofatty acid ester salt is easily hydrolyzed with time in the presence of an alkali builder, use of a specific alkali builder has been proposed. The influence of the slurry temperature is also one of the major factors. However, the above measures are still not sufficient, especially those having poor stability in the detergent slurry will cause deterioration over time even during long-term storage after granulation,
The improvement was behind.

In the detergent for clothes, the alkali builder is an essential component and is also a component necessary in terms of powder physical properties. Therefore, a general-purpose alkali builder and α-sulfofatty acid ester salt are used. It has been desired that they coexist stably over a long period of time. Reducing the amount of alkali builder or adding it to prevent hydrolysis lowers the detergency.
This leads to deterioration of powder properties and cannot be a satisfactory solution.

Furthermore, since the α-sulfofatty acid ester salt is easily hydrolyzed in the slurry aqueous solution, the original detergency is deteriorated. When the slurry temperature is low, the degree of hydrolysis is reduced, but the solubility and the manufacturability of raw materials may be adversely affected.

The inventors of the present invention have made earnest studies from the above viewpoints, and as a result, straight-chain alkylbenzene sulfonic acid was neutralized with a metal carbonate or an alkali metal hydroxide in a slurry formulation to obtain a straight-chain component (b). By preparing the detergent slurry by adding the α-sulfo fatty acid ester salt and zeolite after forming the benzene salt, it is of course possible to further suppress the hydrolysis in the slurry and spray this slurry. It has been found that hydrolysis of the α-sulfofatty acid ester salt with time in a high bulk density granular detergent obtained through a drying and granulation process is also effectively prevented and the product has good fluidity. The temperature of the prepared detergent slurry is preferably 50 to 85 ° C.

Examples of the alkali metal hydroxide used for neutralization include sodium hydroxide and potassium hydroxide, which may be used alone or in combination. The amount of alkali metal hydroxide added is 0 to 95 mol%, preferably 50 to 80, of the neutralization equivalent of the linear alkylbenzene sulfonic acid.
It is in the range of mol%, and the unneutralized linear alkylbenzene sulfonic acid is neutralized with carbonate. If the addition amount of the alkali metal hydroxide exceeds 95% of the neutralization equivalent amount, the effect of suppressing the hydrolysis of the α-sulfofatty acid ester salt becomes insufficient.

In the present invention as set forth in claim 2, the above-mentioned components (a), (b), (c) and (d) are subjected to a neutralizing step of the linear alkylbenzene sulfonic acid as described above, or further added. A detergent slurry containing an optional component such as carbonate is prepared and spray-dried to obtain spray-dried particles.

(3) Common matters In the present invention, the obtained spray-dried particles are granulated together with other detergent components as necessary to have a bulk density of 0.5 g / cc or more, preferably 0.5 to 1.2 g. / Cc High bulk density granular detergent composition. An appropriate method can be adopted as this granulation method. For example, as described in JP-A-60-96698, spray-dried particles and other detergent components such as a nonionic surfactant are used. High bulk density granules of the present invention by kneading and mixing with a kneader, crushing and granulating with a crusher such as a cutter mill type, and further coating the crushed material with a water-insoluble fine powder having an average particle diameter of 10 μm or less. A detergent composition is obtained.

Further, the detergent composition of the present invention may contain other optional components, which may be incorporated into the detergent slurry or may be incorporated during granulation after spray drying. Alternatively, the powder may be mixed after granulation.

The optional components include inorganic builders such as sodium tripolyphosphate and sodium pyrophosphate; sodium citrate, sodium ethylenediaminetetraacetate, nitrilotriacetic acid salt, sodium polyacrylate, sodium acrylate-sodium maleate anhydride. Calcium ion trapping builders such as polymers and polyacetal carboxylates; alkali builders such as silicates; antifouling agents such as carboxymethylcellulose and polyethylene glycol; rinse improvers such as soaps; paratoluenesulfonates, toluenesulfonates, Xylene sulfonate, viscosity modifier such as urea; protease,
Enzymes such as lipase, cellulase and amylase (especially alkaline lipase which has activity in an alkaline atmosphere); softening agents such as quaternary ammonium salts and bentonite; bleaching agents, fluorescent agents, fragrances, dyes, etc. can be used. .

[0042]

According to the present invention described in claim 1, α-
High bulk density with excellent solubility by adding hydrogen carbonate to a detergent slurry containing sulfo fatty acid ester salt, other anionic surfactant and carbonate and spray drying, and further granulating the obtained particles A granular detergent composition can be obtained.

According to the present invention as defined in claim 2,
After linear alkylbenzene sulfonic acid is neutralized with a carbonate metal salt, an alkali metal hydroxide in the slurry formulation to obtain a linear alkylbenzene sulfonate, an α-sulfo fatty acid ester salt and zeolite are added to form a detergent slurry, This is spray-dried and further spray-dried particles are granulated to form high-bulk density detergent particles having a bulk density of 0.5 g / cc or more, thereby preventing hydrolysis of the α-sulfo fatty acid ester salt in the detergent slurry. Not only is it possible to suppress the hydrolysis of the α-sulfofatty acid ester salt even when the high bulk density granular detergent composition obtained through the drying and granulation steps is stored for a long time, and the product has excellent fluidity. It is a thing.

[0044]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Prior to this, the evaluation methods used in the examples will be described.

(1) Evaluation Method of Solubility (Cloth Adhesion) A washing machine (spiral type, reversal type) was used, and tap water and a dark cotton shirt were used. The cloth to be washed is immersed in tap water having a liquid volume of 30 L, a bath ratio of 1:30 and a temperature of 5 ° C.
g was sprinkled and then washed for 5 minutes.

After the washing was completed, the cloth to be washed was dehydrated for 1 minute, and the adhesion of the detergent composition to the cloth was evaluated according to the following criteria. A: No deposit is observed. B: Very little deposit is observed. C: Adhesion is recognized.

(2) Method for measuring the rate of increase in hydrolysis The amount of the anionic surfactant is determined by methylene blue back titration, and the total amount M with the α-sulfofatty acid di salt is determined from the preset blending ratio of the anionic surfactant. Next, the detergent composition is treated with a 90% ethanol solution having a pH of 11 and 50 ° C. to separate the α-sulfofatty acid di salt as an insoluble matter, and the amount S of the di salt is determined by methylene blue back titration,
The hydrolysis rate D is calculated by the formula (A) of the equation 1.

[0048]

[Equation 1] D = (S / M) × 100% (A) From the above operation, the hydrolysis rate immediately after the production of the detergent composition and after standing for 3 days at 60 ° C. was calculated. ), The rate of increase in hydrolysis is calculated.

[0049]

[Equation 2] Hydrolysis increase rate (%) = (hydrolysis rate after 3 days)-
(Hydrolysis rate immediately after production) (B)

Example 1 A detergent slurry having a solid content of 60% was prepared using the components shown in Tables 1 and 2 below except for the nonionic surfactant. This slurry was dried using a countercurrent spray dryer at a hot air temperature of 200 to 280 ° C. so that the water content was 5% to obtain a spray dried product. The spray-dried product had an average particle size of 350 μm and a bulk density of 0.35 g / cc.

Then, the above dried product, nonionic surfactant and water were introduced into a continuous kneader (KRC Kneader # 2 type, manufactured by Kurimoto Iron Works) to obtain a dense and uniform kneaded product. A perforated plate (thickness: 10 mm) having 80 openings with a diameter of 5 mm was installed at the outlet of this kneader, and the kneaded product was about 5 mm x 1
It was a 0 mm cylindrical pellet.

This pellet was mixed with a double amount (flow rate ratio) of 15 ° C.
Crusher with cooling air (speed mill, ND-10
Type, Okada Seiko). At this time, at the same time, 5 parts by weight of finely ground sodium carbonate as a grinding aid was added to 100 parts by weight of the pellets. The crusher has a cutter with a length of 10 cm in four stages of cross, rotates at 3000 rpm, and the screen is made of 360-degree punching metal. This crusher is continuously connected in three stages, and the hole diameter of each stage screen is 1st stage: 3.5 mm, 2nd stage: 2 mm, 3
Step: 1.5 mm. The particles that passed through the pulverizer in three stages were separated from the cooling air to obtain a high bulk density granular detergent composition having the composition shown in Table 1 and having an average particle size of 500 μm and a bulk density of 0.8 g / cc. The high bulk density granular detergent composition prepared by the above method was evaluated for solubility and shown in Table 2.

[0053]

[Table 1]Table 1: Composition of high bulk density detergent Component content (wt%) α-sulfo fatty acid salt (C₁₄~ C₁₆) Methyl ester sodium 10 C₁₄~ C₁₈α-Olefin sulfonate potassium 5 C_Ten~ C₁₄Alkylsulfate 5 straight chain C₁₁~ C₁₃Alkylbenzene sulfonate 15 C₁₂~ C₁₃EOp = 25 adduct of primary alcohol 2 Soap (C₁₂~ C₁₈Fatty acid sodium salt) 5 A-type zeolite 20 Sodium carbonate + potassium carbonate 30 (Details are shown in Table 2) Fluorescent agent 0.2 Hydrogen carbonate Salt shown in Table 2 Moisture 7 Trace component balance EOp: Average number of moles of ethylene oxide added

[0054]

[Table 2] Table 2: Example Comparative Example Composition: Sample No. 1 2 3 4 5 Sodium carbonate / potassium carbonate ratio (wt%) 80/20 80/20 50/50 50/50 80/20 Sodium hydrogen carbonate Amount (wt%) 1-130 Potassium hydrogen carbonate amount (wt%)-1 1-0 Evaluation: Solubility (cloth adhesion) B B A AC

Example 2 A detergent slurry having a solid content of 60% was prepared using the components shown in Table 3 below except for the nonionic surfactant. In this preparation method, alkylbenzene sulfonic acid was neutralized with an alkali metal hydroxide and a carbonate as shown in Table 4 in a slurry formulation, and then α-sulfo fatty acid ester salt, other anionic surfactant, Zeolite is added and prepared so that the temperature of the detergent slurry becomes 50 to 85 ° C.,
5% water content at a hot air temperature of 300 ° C using a countercurrent spray drying tower
To obtain a spray-dried product. The spray-dried product had an average particle size of 350 μm and a bulk density of 0.35 g / cc.

Then, the above dried product, nonionic surfactant and water were introduced into a continuous kneader (KRC Kneader # 2, manufactured by Kurimoto Iron Works) to obtain a dense and uniform kneaded product. A perforated plate (thickness: 10 mm) having 80 openings with a diameter of 5 mm was installed at the outlet of this kneader, and the kneaded product was about 5 mm x 1
It was a 0 mm cylindrical pellet. This pellet was introduced into a pulverizer (speed mill, ND-10 type, Okada Seiko) together with a double amount (flow rate ratio) of cooling air at 15 ° C. At this time, at the same time, 5 parts by weight of finely ground sodium carbonate as a grinding aid was added to 100 parts by weight of the pellets. The crusher has a cutter with a length of 10 cm in 4 stages of cross,
Rotating at 3000 rpm, the screen is made of 360 degree punched metal. This crusher is continuously connected in three stages, and the hole diameter of each stage screen is the first stage: 3.5 mm, 2
Stage: 2 mm, Third stage: 1.5 mm. 3 crushers
The particles that have passed through the stage are separated from the cooling air, have the composition shown in Table 1, have an average particle size of 500 μm, and have a bulk density of 0.8 g / cc.
A high bulk density granular detergent composition of was obtained. The rate of increase in hydrolysis in the slurry prepared by the above method and the fluidity of the high bulk density granular detergent were evaluated and shown in Table 4.

[0057]

[Table 3]Table 3: Composition of high bulk density detergent Component content (wt%) α-sulfo fatty acid salt (C₁₄~ C₁₆) Methyl ester sodium 10 C₁₄~ C₁₈α-Olefin sulfonate potassium 5 straight chain C₁₁~ C₁₃Alkylbenzene sulfonate (listed in Table 4) 20 C₁₂~ C₁₃EOp = 25 adduct of primary alcohol 2 Soap (C₁₂~ C₁₈Fatty acid sodium salt) 5 A-type zeolite 20 Sodium carbonate 20 Potassium carbonate 10 Fluorescent agent 0.2 Moisture 6 Trace component balance EOp: Average number of moles of ethylene oxide added

[0058]

[Table 4] Table 4: Properties of LAS salt and evaluation results Example Comparative Example Sample No. 1 2 3 4 5 6 LAS-H Neutralizer * NaOH mol (%) 90 --- --100 KOH-90 45 25 − − Sodium carbonate / mol (%) 10 10 55 75 100 0 Carbonate-Na amount (%) ** 1.3 0.7 3.7 5.1 7 − LAS ratio (Na / K) 20/0 2/18 11/9 15/5 20/0 20/0 Evaluation results Hydrolysis increase rate (%) 20 20 15 10 5 30 Angle of repose ° (fluidity) 40 to 45 40 40 40 40 45 *) Linear C ₁₁ to ₁₃ Alkylbenzenesulfonic acid (LAS) Amount of neutralizing agent when the equivalent amount of neutralization required to obtain 20% of salt is 100% **) Addition amount in the slurry

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsuneharu Mukaiyama 1-3-7 Main Office, Sumida-ku, Tokyo Lion Corporation

Claims (2)

[Claims] 1. A detergent slurry containing the following components (A), (B), (C) and (D) is prepared, and the spray-dried particles obtained by spray-drying the slurry are granulated to obtain a bulk material. When the density is 0.5 g / cc or more, the following (A), (B),
A method for producing a high-bulk density granular detergent composition, which comprises a granular detergent containing the components (C) and (D) in the following blending amounts, respectively. (A) α-sulfo fatty acid ester salt: 1 to 15% by weight (B) Alkylbenzene sulfonate, α-olefin sulfonate or alkyl sulfate: 3 to 25% by weight, (C) Carbonate: 20 to 45% by weight %, (D) Bicarbonate: 0.5 to 8% by weight. 2. A linear alkylbenzene sulfonic acid is neutralized with a carbonate or a carbonate and an alkali metal hydroxide to obtain a linear alkylbenzene sulfonate, which contains an α-sulfo fatty acid ester salt and zeolite. Detergent raw materials are blended to prepare a detergent slurry, and spray-dried particles of the slurry are granulated to obtain spray-dried particles. The bulk density is 0.5 g / cc or more, and the following (a) and (b) are used. A method for producing a high bulk density granular detergent composition, characterized in that the granular detergent comprises the respective components (c) and (d) in the following blending amounts. (A) α-sulfo fatty acid ester salt: 5 to 40% by weight, (b) linear alkylbenzene sulfonate: 3 to 25% by weight, (c) carbonate: 20 to 40% by weight, (d) zeolite: 10 ~ 25% by weight.