JP2007055997A - Sufactant composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surfactant composition exhibiting good fluidity over a wide temperature range even if containing a polyoxyethylene alkyl ether sulfate salt or alkyl sulfate salt in high concentrations, with no occurrence of viscosity rise or gelation when diluted, and free of decline in the performance inherent in surfactant, and useful for producing skin cleansers or hair cleansers including shampooes and body shampooes. <P>SOLUTION: The surfactant composition comprises (A) the polyoxyethylene alkyl ether sulfate salt of the general formula(1):R<SP>1</SP>O(CH<SB>2</SB>CH<SB>2</SB>O)<SB>n</SB>SO<SB>3</SB>M, (B) an alcohol alkylene oxide adduct of the general formula(2):R<SP>2</SP>O-(AO)<SB>m</SB>-R<SP>3</SP>and (C) a water-soluble salt. In this surfactant composition, the content of the component A is 40 wt.% or greater. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention has good fluidity over a wide range of temperatures even when containing a high concentration of polyoxyethylene alkyl ether sulfate or alkyl sulfate, does not cause viscosity increase or gelation at the time of dilution, The present invention relates to a surfactant composition useful for producing a skin cleanser such as a shampoo or a body shampoo or a hair cleanser without reducing the performance of the shampoo.

  Generally used polyoxyethylene alkyl ether sulfates or alkyl sulfates are very poor in fluidity at high concentrations and are difficult to handle. In order to facilitate the handling, the concentration is handled in the region of 30% by weight or less or in the minimum region of viscosity. For this reason, various attempts have been made to increase the concentration and decrease the viscosity by adding a third component (thickening agent) that does not affect the performance depending on the use of polyoxyethylene alkyl ether sulfate or alkyl sulfate. Yes. For example, a method of adding a sulfonate of an unsaturated fatty acid polyalkylene alkyl ester and an α-sulfonic acid polyalkylene alkyl ester salt (Patent Document 1), a method of adding an alkyl glucoside and an alkali metal salt (Patent Document 2), and many others A method has been proposed. However, depending on the application, it has a bad influence on the performance and is not applicable, and the fluidity deteriorates at low temperatures, and it is necessary to heat and use it at the time of blending the detergent, which is not satisfactory. .

  Moreover, although the method of patent document 1 or 2 has description of the fluidity improvement effect regarding 70 degreeC from room temperature (20 degreeC) vicinity, there is no description of the fluidity improvement in low temperature (5 degreeC) vicinity.

On the other hand, in Patent Document 3, an anionic surfactant such as polyoxyethylene alkyl ether sulfate is represented by the formula: R ¹ O— (CH ₂ CH ₂ O) _n —R ² (R ¹ is a straight chain having 8 to 12 carbon atoms. A liquid detergent composition in which a polyethylene glycol mono- or dialkyl ether represented by a chain alkyl group, R ² is a hydrogen atom or a methyl group, n is an integer of 1 to 3), and an electrolyte such as sodium chloride or sodium sulfate as an optional component Things are disclosed. However, in Patent Document 3, only the thickening and foaming action is mentioned, and the flow due to the thinning action by the high-concentration polyoxyethylene alkyl ether sulfate or the above-mentioned component (polyethylene glycol mono- or dialkyl ether) of the alkyl sulfate. There is no mention of improvement in performance.

Patent Document 4 discloses a liquid detergent composition containing an anionic surfactant such as polyoxyethylene alkyl ether sulfate, an alkylene oxide adduct of 2-ethylhexyl alcohol and a water-soluble magnesium compound such as magnesium chloride. Although described, it is only the disclosure of a liquid detergent composition in which polyoxyethylene alkyl ether sulfate or alkyl sulfate is used at a low concentration, and the composition has a viscosity at 20 ° C. of 10 to 10%. Only those having a low viscosity of 1000 mPa · s are known, and when used as a skin cleanser or hair cleanser such as a shampoo or body shampoo, the feeling of use becomes worse.
Japanese Patent Laid-Open No. 10-17898 WO91 / 04313 Japanese Patent Laid-Open No. 2004-277585 Japanese Patent Laid-Open No. 2004-352943

  Thus, a high concentration polyoxyethylene alkyl ether sulfate or alkyl sulfate has high viscosity and poor fluidity. As a result, handling properties are poor, and there is a problem that gelation occurs when a high-concentration one is diluted.

  The present invention has good fluidity over a wide range of temperatures even when containing a high concentration of polyoxyethylene alkyl ether sulfate or alkyl sulfate, does not cause viscosity increase or gelation at the time of dilution, It is an object of the present invention to provide a surfactant composition useful for producing a skin cleanser such as a shampoo or body shampoo or a hair cleanser without reducing the performance of the shampoo.

  The present inventors combine polyoxyethylene alkyl ether sulfate or alkyl sulfate with an alkylene oxide adduct of a specific alcohol and further water-soluble salts, thereby having good fluidity at a wide range of temperatures and viscosity at the time of dilution. A surfactant composition useful for producing a skin cleanser or hair cleanser such as a shampoo or body shampoo that does not cause an increase or gelation and does not deteriorate the original performance of the surfactant. I found.

That is, the present invention includes the following components (A), (B) and (C):
(A) General formula (1)
R ¹ O (CH ₂ CH ₂ O) _n SO ₃ M (1)
(Wherein R ¹ represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms, average added mole number n represents a number of 0 to 5, and M represents an alkali metal atom, alkanolamine or ammonium) Polyoxyethylene alkyl ether sulfate or alkyl sulfate represented by the following (hereinafter also referred to as component (A))
(B) General formula (2)
_{^{R 2 O- (AO) m -R}} 3 (2)
(In the formula, R ² represents a linear alkyl group having 6 to 10 carbon atoms, AO represents an oxyalkylene group having 2 to 4 carbon atoms, an average added mole number m represents a number of 1 to ^3, Represents an alkylene oxide adduct of an alcohol represented by the following formula (hereinafter also referred to as component (B)):
(C) Water-soluble salts [hereinafter also referred to as component (C)]
And a surfactant composition in which the content of the component (A) is 40% by weight or more.

  Even if the present invention contains polyoxyethylene alkyl ether sulfate or alkyl sulfate in a high concentration, it has good fluidity at a wide range of temperatures, does not cause increase in viscosity or gelation at the time of dilution, A surfactant composition useful for producing a skin cleanser such as a shampoo or body shampoo or a hair cleanser without reducing the original performance of the surfactant such as a feeling of use can be provided.

Hereinafter, the present invention will be described in more detail.
In the polyoxyethylene alkyl ether sulfate or alkyl sulfate represented by the general formula (1) of the component (A) used in the present invention, R ¹ is a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms. Yes, the carbon number is 10 to 16, more preferably 12 to 14, and saturation is preferable. The hydrocarbon group for R ¹ may be linear or branched, but is preferably linear. The average added mole number n represents a number of 0 to 5, preferably 0.5 to 5, more preferably 1 to 3, and even more preferably 1 to 2. M represents an alkali metal atom, alkanolamine or ammonium. Sodium, potassium, etc. are mentioned as an alkali metal atom, Sodium is preferable. As the alkanolamine, triethanolamine is preferable. Component (A) is a component that exhibits the inherent performance of the surfactant.

  Component (A) is 40-70 wt% in the surfactant composition, more preferably 45-70 wt%, even more 45-65 wt%, especially more than 50 wt% and not more than 70 wt%, more particularly 50 wt%. It is preferable from the viewpoint of fluidity to contain more than 65% by weight.

In the alkylene oxide adduct of the alcohol represented by the general formula (2) of the component (B), R ² is a linear alkyl group having 6 to 10 carbon atoms from the viewpoint of foamability and feeling of use. An alkyl group having 8 to 10 carbon atoms and more preferably 8 carbon atoms is preferable.
AO is an oxyalkylene group having 2 to 4 carbon atoms, preferably an oxyalkylene group having 2 to 3 carbon atoms, particularly 3 carbon atoms. Specific examples include an oxyethylene group, an oxypropylene group, and an oxybutylene group, with an oxyethylene group and an oxypropylene group being preferred, and an oxypropylene group being particularly preferred. The average added mole number m is a number of 1 to 3 from the viewpoint of the effect of reducing the viscosity at low temperature, but is further preferably 1.5 to 3, more preferably 2 to 3, and particularly preferably 2 to 2.8.
When the component having the largest number of added moles of AO in component (B) is AO _max , AO _max is 70% by weight of the total component (B) from the viewpoint of economy that reduces the burden of production costs such as purification. It is preferably not more than 60% by weight, more preferably not more than 60% by weight, particularly preferably not more than 50% by weight. In particular, when AO is an oxyalkylene group having 2 carbon atoms, that is, an oxyethylene group, AO _max is preferably 60% by weight or less, more preferably 50% by weight or less, and particularly preferably 40% by weight or less of the whole component (B). In particular, when AO is an oxyalkylene group having 3 carbon atoms, that is, an oxypropylene group, AO _max is 70% by weight or less, further 60% by weight or less, particularly 50% by weight or less of the total component (B). Preferred R ³ represents a hydrogen atom or a methyl group, and particularly preferably a hydrogen atom.
Component (B) can be easily obtained by adding AO (alkylene oxide) to the alcohol. Moreover, AO _max can be adjusted by separating and purifying the resulting alkylene oxide adduct of alcohol.
A component (B) is a component which exhibits an effect in suppressing the thickening of the component (A) at low temperature and improving fluidity. That is, component (B) acts as a viscosity reducing agent for component (A) at low temperatures.

  One or more components (B) can be used, and the compounding ratio of the components (A) and (B) in the surfactant composition of the present invention is from the viewpoint of improving the fluidity at a concentration of 40% by weight or more. The weight ratio is (A) / (B) = 99/1 to 75/25, preferably 98/2 to 85/15, and more preferably 97/3 to 90/10. If it is this range, sufficient fluidity improvement effect can be exhibited.

  Component (B) is included in the surfactant composition in an amount of 0.5 to 15% by weight, more preferably 1 to 10% by weight, and particularly 2 to 8% by weight, to improve fluidity, particularly at low temperatures. It is preferable from the viewpoint.

  As the water-soluble salts of component (C), one or more selected from water-soluble inorganic salts and water-soluble organic salts other than surfactants are preferable. Examples thereof include organic acids such as citric acid, malic acid, succinic acid, and lactic acid, or salts of inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, carbonic acid, and phosphoric acid, and cations that form such salts include sodium, Examples thereof include alkali metals such as potassium, ammonium and aluminum. Preferred examples of these salts include alkali metal salts of inorganic acids such as sodium chloride and sodium sulfate; ammonium salts of inorganic acids such as ammonium chloride, ammonium sulfate and ammonium nitrate; organic acids such as trisodium citrate (especially aliphatic From the viewpoint of usability when used as a skin cleansing agent or hair cleansing agent. The alkali metal salt of organic acid, and ammonium salts of organic acids (especially preferred are aliphatic organic acids). In particular, alkali metal salts of inorganic acids or ammonium salts of inorganic acids are preferred, and one or more can be used. Component (C) is a component that exhibits the effect of improving fluidity at room temperature of component (A). Furthermore, combining components (B) and (C) can synergistically improve the fluidity of component (A) over a wide range of temperatures.

  The compounding ratio of the components (A) and (C) in the cleaning composition of the present invention is (A) / (C) in terms of weight ratio from the viewpoint of fluidity improvement effect when the concentration of the component (A) is 40% by weight or more. ) = 99/1 to 85/15, more preferably 99/1 to 90/10, and particularly preferably 98/2 to 95/5. If it is this range, sufficient fluidity improvement effect can be exhibited.

  The component (C) is contained in the surfactant composition in an amount of 0.1 to 10% by weight, further 0.2 to 8% by weight, more preferably 0.5 to 5% by weight, particularly 1 to 4% by weight. From the viewpoint of sex.

  The surfactant composition of the present invention has improved fluidity and excellent handling properties, so that the viscosity at 30 ° C. is 1000 to 70,000 mPa · s, more preferably 1000 to 50,000 mPa · s, particularly 3000 to 50,000 mPa.・ Viscosity at 5 ° C. is preferably 90,000 mPa · s or less, more preferably 1000 to 70,000 mPa · s, and particularly preferably 5000 to 50,000 mPa · s.

In the present invention, improving the fluidity in a wide temperature range and the solubility at the time of dilution of a composition containing a component (A) having a high concentration of 40% by weight or more can improve the components (B) and (C). This can be achieved by using them simultaneously.
The flowability at low temperature (5 ° C.) is improved by adding component (B) to the high concentration component (A), and the flowability at normal temperature (30 °) is improved by adding component (C). . Furthermore, fluidity | liquidity can be improved over a wide temperature range from low temperature to normal temperature synergistically by using a component (B) and a component (C) together. Further, the surfactant composition thus obtained does not increase in viscosity when diluted, and does not cause gelation, so that it can be easily blended. The detergent composition obtained by blending has good foaming properties and excellent usability.

  The surfactant composition of the present invention can be produced by stirring and mixing the components (A), (B) and (C) at a temperature of 15 to 60 ° C. The dosage form is not particularly limited, but is preferably liquid, paste, or cream. A solvent is preferably used during the production, and water is particularly preferable as the solvent.

  The surfactant composition of the present invention is used as a detergent composition by diluting with water, or as a detergent composition component for a skin cleanser such as a facial cleanser or body shampoo or a hair cleanser such as a shampoo. An optional component can be blended in the cleaning composition containing these surfactant compositions according to the purpose. Here, examples of the optional component include other anionic surfactants, nonionic surfactants, amphoteric surfactants, cationic surfactants, and conditioning components that are usually blended in these detergents.

  Other anionic surfactants include fatty acid salts, phosphate ester salts, sulfosuccinic acid type activators, sulfosuccinamate type activators, polyoxyalkylene alkylamide ether sulfates, monoglyceride sulfates, olefin sulfonates, alkanes. Examples include sulfonates, acylated isethionates, acylated amino acid salts, polyoxyalkylene alkyl ether phosphates, polyoxyalkylene alkyl ether acetates, and the like.

  Nonionic surfactants include alkyl polyglucosides, sucrose fatty acid esters, polyglycerin fatty acid esters, polyoxyalkylene alkyl ethers, fatty acid alkanolamides, alkylamine oxides, fatty acid polyhydric alcohol esters, and the like.

  Amphoteric surfactants include amide betaine surfactants, amide amino acid surfactants, carbobetaine surfactants, sulfobetaine surfactants, amide sulfobetaine surfactants, imidazolinium betaine surfactants. Agents, phosphobetaine surfactants, and the like.

  As the cationic surfactant, the following general formula (3)

[In the formula, at least one of R ⁴ , R ⁵ , R ⁶ and R ⁷ may be substituted by an alkoxy group having 8 to 28 carbon atoms, an alkenyloxy group, an alkanoylamino group or an alkenoylamino group. Represents a good alkyl group or alkenyl group, the remainder represents a benzyl group, an alkyl group having 1 to 5 carbon atoms, a hydroxyalkyl group or a polyoxyethylene group having a total number of added moles of 10 or less, and Z − represents a halogen ion or an organic anion. Show. And quaternary ammonium salts represented by the formula:

  Conditioning ingredients include higher alcohols such as lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, silicone and silicone derivatives, lanolin, squalene, hydrocarbons, protein derivatives, oils such as polyethylene glycol fatty acid esters, cationized cellulose, cations And cationic group-containing copolymers such as Sophcare KG-301W [manufactured by Kao Corporation].

  Other components commonly used in cleaning compositions, for example, water-soluble polymers such as polysaccharides such as methylcellulose, hydroxyethylcellulose, carboxyvinyl polymer, xanthan gum; polyoxyalkylene sorbitan esters, polyoxyethylene glycol distearate Viscosity modifiers such as ethanol; Chelating agents such as ethylenediaminetetraacetic acid (EDTA) and phosphonates; Preservatives such as methylparaben and butylparaben; Active ingredients such as vitamins and their precursors; Animal and plant extracts such as lecithin and gelatin Or its derivatives; polymer fine powders such as nylon and polyethylene; anti-inflammatory agents such as dipotassium glycyrrhizinate; bactericides and antidandruff agents such as triclosan, trichlorocarban, octopirox, zinc pyrithione; dibutylhydroxytoluene, etc. Antioxidants; pearling agents, ultraviolet absorbers, pH adjusting agents, dyes, perfumes, water can be optionally added within the range not damaging the effects of the present invention.

  The cleaning composition of the present invention can be produced according to a conventional method. Also, the dosage form is not particularly limited, and any dosage form such as liquid, paste, cream, solid, powder, etc. can be formed, preferably liquid, paste, cream, particularly liquid Is preferable. In the case of liquid, it is preferable to use water as the liquid medium.

Hereinafter, an example is given and it demonstrates in detail.
Examples 1-24, Comparative Examples 1-16
The surfactant compositions shown in Tables 1 to 4 were prepared according to a conventional method, and the viscosity and fluidity at 30 ° C. and 5 ° C. of the surfactant composition and a 15% by weight aqueous solution as component (A) by the following method. The foaming power was evaluated. The results are also shown in Tables 1 to 4. Component (B) of Examples 1 to 24, Comparative Example 13 and Comparative Example 15 is an alkylene oxide (specifically propylene oxide or ethylene oxide) in an alcohol (specifically octanol, decanol or hexanol) in the presence of an alkali catalyst. ) Was added. Dipropylene glycol monodecyl ether (* 5 in Tables 1 to 4) and ethylene glycol monooctyl ether (* 7 in Tables 1 to 4) were used as they were after reaction neutralization. Dipropylene glycol monohexyl ether (* 6 in Tables 1 to 4), propylene glycol monooctyl ether (* 8 in Tables 1 to 4) and propylene glycol monooctyl ether (* 9 in Tables 1 to 4) are subjected to reaction neutralization. The unreacted alcohol was distilled off under reduced pressure before use. Dipropylene glycol monooctyl ether (* 3 in Tables 1 to 4) and propylene glycol monooctyl ether (* 4 in Tables 1 to 4) were obtained by distillation under reduced pressure after reaction neutralization. In Tables 1 to 4, * 5 to * 9 indicate that AO _max is 50% by weight or less of the whole component (B) by GC.
In addition, the state at the time of dilution to 15 weight% as a component (A) of surfactant composition of Examples 1-24 did not produce a gel, but was able to be diluted easily (within 5 minutes) at room temperature. On the other hand, the state at the time of dilution to 15% by weight as the component (A) of the surfactant compositions of Comparative Examples 1 to 6, 9, 11, and 13 to 16 is that the gel is formed and the dilution at room temperature takes a long time ( About 1 hour). When diluted to 15% by weight as the component (A) of the surfactant composition of Comparative Examples 7, 8, 10 and 12, the state at the time of dilution to 15% by weight resulted in some gel and a little time for dilution at room temperature (15-30 minutes) Cost.

(1) Viscosity measurement Viscosity measurement conditions are as follows.
Viscometer used B type viscometer (manufactured by Tokyo Keiki Co., Ltd.)
Rotor No. / Number of revolutions 4/6 rpm Measurement time 1 minute Temperature 30 ° C .: Hold the glass bottle containing the sample in a constant temperature bath of 30 ° C. ± 1 for 1 hour, then measure temperature 5 ° C .: Measurement after holding in a 5 ° C. ± 1 constant temperature chamber for 24 hours.

(2) Fluidity A glass bottle (diameter 4 cm, height 10 cm) containing 50 g of the surfactant composition was tilted 90 degrees and evaluated with the naked eye.
Temperature 30 ° C .: Evaluation after holding a glass bottle containing a sample in a constant temperature bath at 30 ° C. ± 1 for 1 hour.
Temperature 5 ° C .: Evaluation after holding for 24 hours in a thermostat of 5 ° C. ± 1.
(Liquidity)
A: Good fluidity.
B: Some fluidity C: No fluidity

(3) Foamability test 10 ml of the expert panelists showed the quick foamability and the amount of foam when the hands and arms were washed by dropping 1 ml of the surfactant composition diluted to 15% by weight as the component (A). According to the evaluation criteria of, it was compared with an unadded product.
(Rapid foaming)
4: Very fast foaming property.
3: Good quick foaming property.
2: Quick foaming property is slightly bad.
1: Poor foaming property.
(Bubble amount)
4: The amount of foam is very large compared to the non-added product.
3: The amount of foam is larger than the non-added product.
2: Foam amount equivalent to unadded product.
1: The amount of foam is smaller than that of the non-added product.
(Feel when washing)
4: Felt feel better than unadded product.
3: I felt that the touch was slightly better than the non-added product.
2: The feel was equivalent compared to the non-added product.
1: It felt that the touch was not good compared with the non-added product.
(Feel when rinsing)
4: Felt feel better than unadded product.
3: I felt that the touch was slightly better than the non-added product.
2: The feel was equivalent compared to the non-added product.
1: It felt that the touch was not good compared with the non-added product.
The average score of 10 persons' evaluation was calculated | required, 3.6 or more was set to A, 2.6-3.5 was set to B, 1.6-2.5 was set to C, and 1.5 or less was set to D.

Example 25
A body shampoo having the following composition was produced.
Ingredient weight%
Surfactant composition of Example 5 5.0
Sodium laurate 6.0
Sodium myristate 3.0
Sodium palmitate 1.0
2-Ethylhexyl glyceryl ether 1.0
Glycerin 3.0
Methyl paraben Appropriate fragrance Appropriate amount
Purified water balance meter 100.0
This body shampoo had no viscosity increase upon dilution of the surfactant composition of Example 5, was easily compounded, had good foaming properties, and was excellent in use feeling.

Example 26
A shampoo having the following composition was produced.
Ingredient weight%
Surfactant composition of Example 2 15.0
Amidopropyl betaine * 2.0
Myristyl alcohol 1.0
Cationized guar gum ** 0.5
Ethanol 3.0
Perfume
Purified water balance
Total 100.0
*: Anhitoal 20AB (manufactured by Kao Corporation)
**: JAGUAR C-13S (made by Rhodia)
This shampoo had no viscosity increase upon dilution of the surfactant composition of Example 2, was easily blended, had good foaming properties, and had excellent usability.

Example 27
A shampoo having the following composition was produced.
Ingredient weight%
Surfactant composition of Example 14 16.0
Coconut oil fatty acid N-methylethanolamide * 1.0
Myristyl alcohol 1.0
Cationized guar gum ** 0.5
Ethanol 3.0
Perfume
Purified water balance
Total 100.0
*: Aminone C-11S (manufactured by Kao Corporation)
**: JAGUAR C-13S (made by Rhodia)
This shampoo had no viscosity increase upon dilution of the surfactant composition of Example 14 and could be easily formulated, had good foaming properties, and had excellent usability.

Claims (9)

The following components (A), (B) and (C);
(A) General formula (1)
R ¹ O (CH ₂ CH ₂ O) _n SO ₃ M (1)
(Wherein R ¹ represents a saturated or unsaturated hydrocarbon group having 8 to 18 carbon atoms, average added mole number n represents a number of 0 to 5, and M represents an alkali metal atom, alkanolamine or ammonium) Polyoxyethylene alkyl ether sulfate or alkyl sulfate (B) represented by the general formula (2)
_{^{R 2 O- (AO) m -R}} 3 (2)
(In the formula, R ² represents a linear alkyl group having 6 to 10 carbon atoms, AO represents an oxyalkylene group having 2 to 4 carbon atoms, an average added mole number m represents a number of 1 to ^3, Represents a hydrogen atom or a methyl group), a surfactant composition containing an alkylene oxide adduct (C) water-soluble salt of alcohol and having a content of component (A) of 40% by weight or more.   The surfactant composition according to claim 1, wherein AO of the component (B) is an oxyalkylene group having 3 to 4 carbon atoms. When the largest component of the addition mole number of AO in the component (B) was AO _max, AO _max is the component (B) surfactant composition of claim 1, wherein the total is 70 wt% or less.   The surfactant composition according to any one of claims 1 to 3, wherein the components (A) and (B) are (A) / (B) = 99/1 to 75/25 by weight ratio.   The surfactant composition according to any one of claims 1 to 4, wherein the ratio of the component (A) and the component (C) is (A) / (C) = 99/1 to 85/15 in weight ratio. .   The surfactant composition according to any one of claims 1 to 5, which has a viscosity at 5 ° C of 90,000 mPa · s or less.   The surfactant composition according to any one of claims 1 to 6, wherein the water-soluble salt is at least one selected from water-soluble inorganic salts and water-soluble organic salts other than surfactants.   The surfactant composition according to any one of claims 1 to 6, wherein the water-soluble salt is at least one selected from alkali metal salts of inorganic acids and ammonium salts of inorganic acids.   A detergent composition obtained by blending a surfactant and / or water with the surfactant composition according to claim 1.