JP2000290698A - Powder detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a powder detergent composition based on a fatty acid soap, which has excellent detergency even in water having high hardness and also has an excellent detergency against mud stains. SOLUTION: The present invention relates to (A) fatty acid soap of 20 to 5%.
0 wt%; (B) the general formula R ¹ O- (AO) a polyoxyalkylene represented by _n -H nonionic surfactant 0.5 to 20 wt%; (C) aspartic acid di acetate, glutamate di Acetic acid, hydroxyiminodisuccinic acid, iminodisuccinic acid, ethylenediamine disuccinic acid, polyaspartic acid or polyglyoxylic acid or 0.1 to 15% by weight of these salts; and (D) 1 to 30% by weight of the layered alkali metal silicate % Powder cleaning composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a powder detergent composition.

[0002]

2. Description of the Related Art A detergent for clothing mainly comprises a surfactant for solubilizing dirt adhering to clothing and dissolving and dispersing the same in a washing liquid, and also includes an alkali agent, a re-staining inhibitor, a chelating agent and the like. It is generally composed of Among these components, components that do not have a detergency themselves, but improve the detergency when used in combination with a surfactant, are called builders. Builders include inorganic builders such as zeolites, carbonates, silicates and phosphates. On the other hand, as the organic builder, there is an acrylic acid-based polymer or the like that exhibits the action of zeolite as a cobuilder. Polyethylene glycol, carboxymethyl cellulose, and the like are used as the anti-soil redeposition agent, and ethylenediaminetetraacetate, citrate, and the like are used as the chelating agent. In recent years, so-called compact detergents, which have a high bulk density and a small usage amount per use, are mainly used as powder detergents for clothing. It is said that the choice of inorganic builder is the key to downsizing detergents. Currently, mainly used inorganic builders are zeolite (aluminosilicate), sodium silicate, sodium carbonate and the like.

[0003] A chelating agent, which is one of the organic builders, is blended for the purpose of capturing calcium ions and magnesium ions in water. When fatty acid soaps are used as surfactants, these chelating agents are very important factors. Fatty acid soaps are excellent surfactants which have good detergency and foaming and have a small impact on the environment due to good biodegradability, but have the problem of poor hard water resistance. That is, in hard water containing a large amount of calcium ions and the like, not only water-insoluble calcium soap is formed to lower the detergency but also so-called soap scum is generated.
Therefore, it is important to appropriately mix a chelating agent to sequester these metal ions. The chelating agent mainly used so far has been ethylenediaminetetraacetate.

[0004]

In the past, sodium tripolyphosphate, an inorganic builder used in clothing detergents, is a multibuilder excellent in metal ion trapping ability, dirt dispersing ability, and alkali buffering ability. They are now rarely used because they eutrophize lakes and rivers and cause environmental pollution. Since clothing detergents are released into the environment after use, environmental safety is more demanding than other products. As described above, fatty acid soaps are highly safe for the environment because they are composed of biologically-derived natural raw materials, but among conventional chelating agents used in combination with fatty acid soaps, they are hardly decomposable, The chelating ability was weak or not satisfactory. Therefore, the present inventors have intensively studied a powder detergent based on a fatty acid soap, and have a superior detergency even in water having high hardness, and a powder that exhibits an excellent detergency against mud stains. A cleaning composition has been developed.

[0005]

That is, the present inventors have developed a detergent composition containing a fatty acid soap as a main component and a composition containing specific organic and inorganic builder components. The present invention has been found to have excellent detergency even in hard water despite the fact that fatty acid soap is the main component due to the interaction of the components, and also exhibit excellent detergency against mud stains. .

According to the present invention, as the component (A), a fatty acid soap is 20 to 50% by weight; and as the component (B), the following general formula (1) R ¹ O- (AO) _n -H (1) Wherein R ¹ represents a hydrocarbon group, AO represents an oxyalkylene group, and n represents a number of 1 or more.) 0.5 to 20% by weight of a nonionic surfactant represented by the formula (C): As aspartic acid diacetic acid, glutamic acid diacetic acid, hydroxyiminodisuccinic acid, iminodisuccinic acid, ethylenediaminedisuccinic acid, polyaspartic acid or polyglyoxylic acid or a salt thereof is 0.1
And (15) a layered alkali metal silicate as component (D).
It is a powder detergent composition containing, as an essential component,% by weight (however, the amount of each component is a ratio to the total amount of the composition).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The fatty acid soap as the component (A) of the present invention is composed of a fatty acid and a base. As fatty acids, for example, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid,
Oleic acid, zomaric acid, linoleic acid, linolenic acid,
Arachiic acid, gadrenic acid, behenic acid, erucic acid, lignoceric acid, seracoleic acid, cerotic acid, montanic acid, melicic acid, celloplastic acid, ricinoleic acid,
12-hydroxystearic acid and the like. Further, mixed fatty acids derived from natural fats and oils containing these fatty acids may be used. Examples of the natural fats and oils include linseed oil, eno oil, deer oil, olive oil, cocoa butter, kapok oil, white mustard oil, sesame oil, rice bran oil, safflower oil,
Vegetable oils such as shea nut oil, cinnamon oil, soybean oil, teaseed oil, camellia oil, corn oil, rapeseed oil, palm oil, palm kernel oil, castor oil, sunflower oil, cottonseed oil, coconut oil, tree wax, peanut oil, etc. And horse fat, beef tallow, beef leg fat, beef tallow,
Animal fats and oils such as lard, goat fat, sheep fat, milk fat, fish oil, and whale oil. Among the above fatty acids, preferred from the viewpoint of detergency are saturated or unsaturated fatty acids having 10 to 22 carbon atoms, or mixed fatty acids derived from fats and oils containing saturated or unsaturated fatty acids having 10 to 22 carbon atoms.

[0008] Bases for forming fatty acid soaps from the above fatty acids include alkali metal atoms such as lithium, sodium and potassium, ammonia, methylamine, dimethylamine, ethylamine, diethylamine, (iso) propylamine, di (iso) amine. Propylamine, monoethanolamine, N-methylmonoethanolamine, N-ethylmonoethanolamine, diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, 2-amino-
2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, aminoethylethanolamine, N, N, N ′, N′-tetrakis (hydroxyethyl) ethylenediamine, N, N, N And ammonium such as', N'-tetrakis (2-hydroxypropyl) ethylenediamine. The amount of the fatty acid soap of the component (A) is 20 to 50% by weight based on the total amount of the composition.
Preferably it is 25 to 45% by weight. This is because if the amount is too large, the solubility in water becomes worse, while if the amount is too small, the detergency decreases.

The component (B) of the present invention is a nonionic surfactant represented by the aforementioned general formula (1). In the general formula (1), R ¹ represents a hydrocarbon group. Examples of the hydrocarbon group include an alkyl group, an alkenyl group, an aryl group, a cycloalkyl group, and a cycloalkenyl group. Examples of the alkyl group include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, tertiary butyl, pentyl, isopentyl, secondary pentyl, neopentyl, tertiary pentyl, hexyl, secondary hexyl, heptyl, and secondary Heptyl, octyl, 2-ethylhexyl, secondary octyl, nonyl, secondary nonyl, decyl, secondary decyl, undecyl, secondary undecyl, dodecyl, secondary dodecyl, tridecyl, isotridecyl, secondary tridecyl, tetradecyl, secondary tetradecyl, Hesisadecyl, secondary hexadecyl, stearyl,
Icosyl, docosyl, tetracosyl, triacontyl,
2-butyloctyl, 2-butyldecyl, 2-hexyloctyl, 2-hexyldecyl, 2-octyldecyl,
2-hexyldecyl, 2-octyldodecyl, 2-decyltetradecyl, 2-dodecylhexadecyl, 2-hexadecyloctadecyl, 2-tetradecyloctadecyl, monomethyl-branched-isostearyl and the like can be mentioned.

Examples of the alkenyl group include vinyl, allyl, propenyl, butenyl, isobutenyl, pentenyl, isopentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tetradecenyl, oleyl and the like. Examples of the aryl group include phenyl, toluyl, xylyl,
Cumenyl, mesityl, benzyl, phenethyl, styryl, cinnamyl, benzhydryl, trityl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, undecylphenyl, dodecylphenyl, Examples include phenylphenyl, benzylphenyl, styrenated phenyl, p-cumylphenyl, α-naphthyl and β-naphthyl groups. Examples of the cycloalkyl group and the cycloalkenyl group include, for example, cyclopentyl, cyclohexyl, cycloheptyl, methylcyclopentyl, methylcyclohexyl,
Methylcycloheptyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, methylcyclopentenyl,
Examples thereof include a methylcyclohexenyl group and a methylcycloheptenyl group.

Among these, preferred groups for R ¹ are an alkyl group, an alkenyl group or an aryl group, more preferably an alkyl group, an alkenyl group or an aryl group having 8 to 18 carbon atoms, and more preferably 8 to 18 carbon atoms. More preferably, the alkyl group is If the carbon number of R ¹ is too small, the detergency decreases, while if the carbon number is too large, the solubility in water becomes poor.

AO represents an oxyalkylene group, preferably an oxyalkylene group having 2 to 4 carbon atoms. AO
Is preferably two or more oxyalkylene groups, one of them is preferably an oxyethylene group. The (AO) _n part of the general formula (1) can be obtained by addition polymerization of an alkylene oxide such as ethylene oxide, propylene oxide, butylene oxide and epichlorohydrin. AO is determined by the type of alkylene oxide or the like to be added. The polymerization form of the alkylene oxide or the like to be added is not particularly limited, and one type of homopolymerization, two or more types of random copolymerization,
Either block copolymerization or random / block copolymerization may be used. The polymerization degree n is a number of 1 or more, preferably 1 to 100, more preferably 1 to 30, and still more preferably 1 to 20.

The amount of the nonionic surfactant (B) of the present invention is 0.5 to 20% by weight based on the total weight of the composition.
Preferably it is 1 to 10% by weight. This is because if the amount is too large, the product may become sticky and cause problems such as caking, whereas if the amount is too small, sufficient cleaning power may not be obtained.

The component (C) of the present invention comprises aspartic acid diacetate, glutamic acid diacetate, hydroxyiminodisuccinic acid, iminodisuccinic acid, ethylenediaminedisuccinic acid,
Polyaspartic acid or polyglyoxylic acid or salts thereof. The component (C) is excellently effective as a biodegradable chelating agent or builder when incorporated into a detergent. The component (C) of the present invention is specifically represented by the following general formulas (C-1) to (C-7). Aspartic acid diacetate (ASDA) is represented by the following general formula (C-1).

[0015]

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Glutamic acid diacetate (GLDA) is represented by the following general formula (C-2).

[0017]

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Hydroxyiminodisuccinate (HID)
S) is represented by the following general formula (C-3).

[0019]

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The iminodisuccinate (IDS) is represented by the following general formula (C-4).

[0021]

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Ethylenediamine disuccinate (EDD)
S) is represented by the following general formula (C-5).

[0023]

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In the general formulas (C-1) to (C-5), M represents a hydrogen atom, a metal atom or ammonium, and R represents a hydrogen atom or a hydroxyl group. Polyaspartate (PA
sp) is represented by the following general formula (C-6).

[0025]

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The polyglyoxylic acid (PGuli) is represented by the following general formula (C-7).

[0027]

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In the general formulas (C-6) and (C-7), M represents a hydrogen atom, a metal atom or ammonium, and m and m 'represent one or more numbers. Polyaspartic acid and polyglyoxylic acid have a molecular weight of 1,000 to 30,000.
It is preferable that

Examples of the metal atom include alkali metal atoms such as lithium, sodium and potassium. Examples of ammonium include ammonia, methylamine, dimethylamine, ethylamine, diethylamine, (iso) propylamine, di (iso) propylamine, monoethanolamine, N-methylmonoethanolamine, N-ethylmonoethanolamine, and the like.
Diethanolamine, triethanolamine, monopropanolamine, dipropanolamine, tripropanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, aminoethylethanolamine, N, N, N ',
Examples include ammonium such as N′-tetrakis (hydroxyethyl) ethylenediamine and N, N, N ′, N′-tetrakis (2-hydroxypropyl) ethylenediamine. The compounding amount of the component (C) of the present invention is 0.1 to 15% by weight, preferably 0.5 to 10% by weight, based on the total amount of the composition. This is because if the blending amount is too large, a further detergency cannot be expected, while if it is too small, a sufficient detergency may not be expected.

The component (D) of the present invention is a layered alkali metal silicate. A representative layered alkali metal silicate can be represented by the following general formula (2). _{M'M "Si x O (2x +} 1) · yH 2 O (2) ( wherein, M 'represents an alkali metal atom, M" represents a hydrogen atom or an alkali metal atom, x is preferably 1
Represents a number from 4 to 4, and y preferably represents a number of 30 or less. The alkali metal atoms include lithium, sodium,
Potassium and the like can be mentioned, and sodium is most preferred. x
Is preferably 1 to 4, and more preferably 1.5 to 3. y is preferably a number of 30 or less, more preferably 22 or less, still more preferably 10 or less. The above-mentioned layered alkali metal silicate can be generally obtained by baking amorphous glassy sodium silicate at 200 to 1,000 ° C. to make it crystalline. The layered alkali metal silicates as described above can be obtained as commercial products in the form of fine powder, powder, granules and the like. The compounding amount of the layered alkali metal silicate of the component (D) of the present invention is 1 to 30% by weight, preferably 5 to 25% by weight based on the total amount of the composition. This means that if the blending amount is too large, further detergency may not be expected, while if it is too small,
This is because a sufficient detergency may not be obtained.

Although the powder detergent composition of the present invention comprises the above components, it is preferable to further add a crystalline aluminosilicate as the component (E). This is generally called zeolite, and has the following general formula (3): a (M ′ ₂ O) · Al ₂ O ₃ · b (SiO ₂ ) · c (H ₂ O) (3) In the formula, M ′ is an alkali metal atom, and a is generally 0.1.
About 5 to 2.0, b represents about 0.5 to 6, and c represents a number larger than 0. ). As the crystalline aluminosilicate, a synthetic zeolite having an average primary particle size of 0.1 to 10 μm typified by A-type, X-type or P-type zeolite can be preferably used. (E) of the present invention
The amount of the components is not particularly limited. However, in order to exhibit sufficient detergency and stability over time, it is preferable to mix a certain amount, but on the other hand, to sufficiently dissolve in water, it is preferable to suppress the amount to an appropriate amount. The amount of the component (E) is 10 to 50 with respect to the total composition.
% By weight is preferable, and 15 to 45% by weight is more preferable.
20-35% by weight is more preferred. This means that if the amount is too large, not only the detergency will not increase, but also problems such as reduced solubility and adhesion to clothing may be caused.On the other hand, if the amount is too small, sufficient detergency will be obtained. This is because they may not be obtained.

In the present invention, the fatty acid soap is used as the main active ingredient of the detergent, and the above-mentioned components (A) to (D) are blended in the above-mentioned ratio, and more preferably, the component (E) is blended. It is the cleaning composition comprised by this. The cleaning agent of the present invention,
By having a composition having such a composition, it has an excellent chelating action, so that it exhibits excellent detergency without generating soap scum and the like even in hard water, and has an excellent detergency for mud stains. It is a detergent with low environmental impact because it is composed of components with high biodegradability.

In addition, if necessary, the powder detergent composition of the present invention may contain an inorganic salt, a metal ion scavenger, a redeposition inhibitor, a polycarboxylate, an enzyme, a chlorine scavenger, a bleaching agent, a caking inhibitor, An enzyme activator, an antioxidant, a preservative, a dye, a fragrance, and the like can be added.

Examples of the inorganic salts include sodium silicate, potassium silicate, sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium sulfate, potassium sulfate, and sodium bicarbonate.
Examples of the metal ion scavenger include tripolyphosphoric acid, pyrophosphoric acid, orthophosphoric acid, aluminosilicate, nitrilotriacetate, ethylenediaminetetraacetate, citrate, isocitrate, polyacetalcarboxylate, and the like. As the anti-soil redeposition agent, for example, polyethylene glycol, polyvinyl alcohol, polyvinyl pyrrolidone,
Carboxymethylcellulose and the like. Examples of the polycarboxylate include polyacrylic acid (salt),
Acrylic acid-allyl alcohol copolymer (salt), acrylic acid-maleic acid copolymer (salt), polyhydroxyacrylic acid (salt), polytetramethylene-1,2-dicarboxylic acid (salt) and the like. Examples of enzymes include cellulase, protease, amylase, lipase, hemicellulase, glycosidase, glucose oxidase,
Cholesterol oxidase and the like.

Examples of the chlorine scavenger include ammonium sulfate, urea, guanidine hydrochloride, guanidine carbonate, guanidine sulfamate, thiourea dioxide, monoethanolamine, diethanolamine, triethanolamine and the like. Examples of the bleaching agent include percarbonate, perborate, sulfonated phthalocyanine salt, hydrogen peroxide and the like. Examples of the anti-caking agent include paratoluenesulfonate, xylenesulfonate, acetate,
Sulfosuccinate, talc, finely divided silica, clay, magnesium oxide and the like. Examples of the antioxidant include tert. -Butylhydroxytoluene (hereinafter, t
ert. -Butyl is abbreviated as t-butyl. ), 4,
4′-butylidenebis- (6-t-butyl-3-methylphenol), 2,2′-butylidenebis- (6-t-
Butyl-3-methylphenol), monostyrenated cresol, distyrenated cresol, monostyrenated phenol, distyrenated phenol, 1,1′-bis-
(4-hydroxyphenyl) cyclohexane and the like.

The method for producing the powder detergent of the present invention is not particularly limited, and may be a conventional method for producing a high-density detergent. Examples of the method of densification include a method of spraying a surfactant slurried into spray-dried particles to increase the density, and a method of increasing the density while occluding the surfactant slurried in a powder containing an oil-absorbing carrier. And the like. When the density is increased as described above, the powder physical properties of the powder detergent composition usually have an average particle diameter of 200 to 1,000 μm and a bulk density of about 0.5 to 1.2 g / cm ³ . The specific application of the powder detergent composition of the present invention is not particularly limited, and it can be used for any cleaning application, but it is a composition particularly suitable for use in clothing.

[0037]

The present invention will be described more specifically with reference to the following examples. In the following examples, parts and percentages are by weight unless otherwise specified.

Example 1 Detergency Test with High Hardness Water Deionized water at a temperature of 20 ° C. was added to calcium chloride by adding calcium chloride to a hardness of 100 ppm (calculated in terms of calcium carbonate). 1 g of each of the cleaning compositions of the present invention and the comparative product shown in Table 4 was dissolved to prepare a cleaning solution. For each of these washing liquids, 10 stained cloths (Contaminated Cloth of Washing Science Association) were added, and the bath ratio was 1:
After adjusting to 30 and washing with a tergot meter at 120 rpm for 10 minutes, rinsing for 3 minutes was performed twice. After drying, the reflectance of the washed contaminated cloth was measured. From the reflectance of the original cloth and the contaminated cloth before and after cleaning, the following equation (Kubelka-M) was obtained.
The washing rate was calculated according to the formula of unk. Tables 1 to 4 show the results of the above detergency test using high hardness water. However, the Washing Science Association contaminated cloth used in Example 1 was prepared using artificial soil having the following composition. As oily components, oleic acid 28.3%, triolein 15.6%,
Cholesterol oleate 12.2%, liquid paraffin 2.5%, squalene 2.5% and cholesterol 1.
6%, gelatin 7% as protein, 29.8% mud and 0.5% carbon black as inorganic components

[0039]

(Equation 1)

[0040]

(Equation 2)

Here, in this equation, R is the reflectance obtained in the above-mentioned detergency test.

Example 2 Detergency Test for Inorganic Dirt Ion-exchanged water was added with calcium chloride to a hardness of 50 ppm.
In 1 liter of artificial hard water prepared in terms of (calcium carbonate), 6 g of each of the cleaning compositions of the present invention or the comparative product shown in Tables 1 to 4 was dissolved to prepare a cleaning solution.
To each of these cleaning liquids, 10 contaminated cloths WFK-10C (manufactured by Test Fabric) were added, and immersed at 40 ° C. for 1 hour. Then, for 1 liter of the above artificial hard water,
Similarly, a new cleaning solution was prepared by dissolving 5 g of each of the cleaning compositions of the present invention or the comparative product shown in Tables 1 to 4,
Each test cloth immersed in this cleaning solution was used for 20 times.
After adjusting the bath ratio to 1: 250 at ℃ and washing with a mini-mini washer NA-32 (manufactured by Matsushita Electric Industrial) for 10 minutes,
A 3 minute rinse was performed. After drying, the reflectance of the washed contaminated cloth was measured, and the cleaning rate was calculated in the same manner as in Example 1. Table 1 shows the results of the detergency test for the above inorganic stains.
It is shown in Table 4. However, the contaminated cloth WFK-
10C was prepared using artificial soil mainly composed of inorganic soil having the following composition. 86% viscous soil, 8% soot soil, 4% ferrous oxide, 2% ferric oxide

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

[0046]

[Table 4]

The following components were used as the components shown in Tables 1 to 4. Fatty acid soap 1: oleic acid 40%, linoleic acid 25%,
Palmitic acid 15%, stearic acid 6%, lauric acid 5
% And a sodium salt of a mixed fatty acid having a composition of 9% and a neutralization value of 200 to 210. Fatty acid soap 2: Fatty acid composition similar to fatty acid soap 1, with sodium soap / potassium soap = 6/4. AE: Palm alkyl (8) ethoxylate ASDA: Sodium aspartate diacetate GSDA: Sodium glutamic acid diacetate IDS: Sodium iminodisuccinate EDDS: Sodium ethylenediamine disuccinate PAsp: Sodium polyaspartate, molecular weight 5,000 PGuli : Polyglyoxylate sodium salt, molecular weight: 5,000 Layered silicate: Na ₂ Si ₂ O ₅ (trade name: SKS-6, manufactured by Hoechst Japan), apparent specific gravity 500 g / L, particle size distribution d ₅₀ = 150 μm. PEG: polyethylene glycol, molecular weight 6,000
0 Zeolite: A-type zeolite Silicate: No. 2 sodium silicate Carbonate: Sodium carbonate with an apparent specific gravity of about 1.2 Others: Enzymes, fragrances, moisture

[0048]

The effect of the present invention is to provide a powder detergent composition comprising a biodegradable organic builder mixed with a powder detergent based on a fatty acid soap.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme Court ゛ (Reference) C11D 9/30 C11D 9/30 (72) Inventor Yukio Nagamine 7-35-35 Higashiogu, Arakawa-ku, Tokyo Asahi Inside the Denka Kogyo Co., Ltd. (72) Chiho Taniguchi 7-2-35 Higashiogu, Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. (72) Keiji Koyama 7-35, Higashiogu Arakawa-ku, Tokyo Asahi Denka Kogyo Co., Ltd. F-term (reference) 4H003 AB03 AC08 BA09 DA01 EA15 EA16 EA28 EB07 EB12 EB13 EB36 EC01 FA04

Claims (3)

[Claims] (1) As the component (A), a fatty acid soap of 20 to
50% by weight; as a component (B), the following general formula (1) R ¹ O— (AO) _n —H (1) (wherein R ¹ represents a hydrocarbon group, and AO represents an oxyalkylene group) , N represents a number of 1 or more.) 0.5 to 20% by weight of a nonionic surfactant represented by the following formula (C): As component (A), aspartic acid diacetate, glutamic acid diacetate, hydroxyiminodisuccinic acid, iminodisuccinic acid Acid, ethylenediaminedisuccinic acid, polyaspartic acid or polyglyoxylic acid or a salt thereof in 0.1%
And (15) a layered alkali metal silicate as component (D).
A powder detergent composition containing% by weight (however, the amount of each component is a ratio to the total amount of the composition). 2. The powder detergent composition according to claim 1, wherein the component (C) is an alkali metal salt or an ammonium salt. 3. The powder detergent composition according to claim 1, further comprising a crystalline aluminosilicate as the component (E).