JP5038860B2 - Liquid detergent composition - Google Patents

Description

  The present invention relates to a liquid detergent composition, and more particularly to a liquid detergent composition having excellent mildness to skin, low-temperature stability, and good foam quality.

For example, fatty acid salts, LES, N-acyl amino acid salts, and the like are used as the base material of the liquid detergent. Among these, N-acyl amino acid salts have recently been shown to be highly mild and safe for the skin. It is the mainstream as a basic substrate. However, this base material has problems such as precipitation at a low temperature, a small amount of foam, and rough foam quality. Therefore, conventionally, for the purpose of improving the low temperature stability and good foam quality of liquid detergents containing anionic surfactants such as N-acylamino acid salts, amphoteric surfactants and polyhydric alcohols have been used. Although the technique (for example, patent documents 1-3) to combine is reported, the effect is not enough.
Therefore, in a liquid detergent containing an anionic surfactant such as an N-acyl amino acid salt, there is still a technique that can improve low-temperature stability and good foam quality while maintaining mildness to the skin. The current situation is what is required.

JP 2006-183039 A JP 2003-277792 A JP-A-10-218744

  An object of the present invention is to solve the conventional problems and achieve the following objects. That is, the present invention provides a liquid detergent composition comprising an N-acylamino acid type anionic surfactant, which is excellent in all of mildness to skin, low-temperature stability, and good foam quality. The purpose is to provide goods.

  As a result of intensive studies to achieve the above object, the present inventors have determined that (A) an N-acylamino acid type anionic surfactant and (B) an amphoteric surfactant at a specific content ratio. Containing and (C) a relatively highly polymerized polyethylene glycol at a specific content maintains the mildness of the liquid detergent composition to the skin (the skin is not soft after washing, etc.). In addition, the present inventors have found that the low-temperature stability and the good foam quality (foam fineness, foam creaminess, etc.) can be remarkably improved, and the present invention has been completed.

The present invention is based on the above findings by the present inventors, and means for solving the above problems are as follows. That is,
<1> (A) an N-acylamino acid type anionic surfactant;
(B) an amphoteric surfactant;
(C) polyethylene glycol having an average molecular weight of 1000 to 20000, the content of the (C) polyethylene glycol is 0.05 to 5.0% by mass, and the (A) N-acylamino acid type The content of the (B) amphoteric surfactant with respect to the content of the anionic surfactant is (B) / (A) = 2-15 in terms of mass ratio. It is.
<2> The content of (C) polyethylene glycol with respect to the total content of (A) N-acylamino acid type anionic surfactant and (B) amphoteric surfactant is (C) ) / [(A) + (B)] = 0.01 to 1.0. The liquid cleaning composition according to <1>.
<3> The liquid detergent composition according to any one of <1> to <2>, wherein the pH is 4 to 7.
<4> The liquid detergent composition according to any one of <1> to <3>, which is filled in a former container.

  According to the present invention, the conventional problems can be solved and the object can be achieved. In a liquid detergent composition containing an N-acylamino acid type anionic surfactant, mild to skin, low temperature A liquid detergent composition excellent in both stability and good foam quality can be provided.

(Liquid detergent composition)
The liquid detergent composition of the present invention comprises (A) an N-acyl amino acid type anionic surfactant, (B) an amphoteric surfactant, and (C) polyethylene glycol having an average molecular weight of 1000 to 20000 (in the present specification) In this case, it may be simply referred to as “polyethylene glycol”) and, if necessary, other components may be appropriately contained.

<(A) N-acylamino acid type anionic surfactant>
The N-acylamino acid type anionic surfactant is mainly used for the mildness of the liquid detergent composition to the skin (such as the non-textured skin after washing) and the foam quality (foam quality). It is formulated for the purpose of improving texture fineness, foam creaminess, and the like.
There is no restriction | limiting in particular as said N-acyl amino acid type | mold anionic surfactant, According to the objective, it can select suitably, For example, N-lauroyl-beta-alanine or its salt, N-myristyl-beta-alanine Or a salt thereof, N-cocoyl-β-alanine or a salt thereof, N-lauroylglutamic acid or a salt thereof, N-cocoylglycine or a salt thereof, N-lauroyl-N-methyl-β-alanine or a salt thereof, N-myristoyl- N-methyl-β-alanine or a salt thereof, N-lauroyl-N-methylglycine or a salt thereof, N-myristoyl glutamic acid or a salt thereof, N-lauroyl aspartic acid or a salt thereof, N-cocoylalanine or a salt thereof, N- A cocoyl glutamic acid or its salt is mentioned. N-acylamino acid type anionic surfactants include L-form, D-form and racemic form, and any of these can be used as the component (A).
Examples of the salt include alkali metal salts and alkanolamine salts. Examples of the alkali metal salt include sodium salt and potassium salt, and examples of the alkanolamine salt include monoethanolamine salt and triethanolamine salt.
Among these, as the component (A), N-lauroyl-N-methyl-β-alanine sodium and N-cocoyl glutamic acid are excellent in terms of mildness to skin, low temperature stability, and good foam quality. Sodium is preferred.
The amino acids in the N-acyl amino acid type anionic surfactant are limited to those having a carboxyl group, that is, taurine is not included. When an N-acyl taurine type anionic surfactant is used instead of the N-acyl amino acid type anionic surfactant, there is a problem that the foam quality of the liquid detergent composition is poor (comparison). See Example 8 below).

The N-acylamino acid type anionic surfactants may be used alone or in combination of two or more.
There is no restriction | limiting in particular as content of the said N-acylamino acid type | mold anionic surfactant, Although it can select suitably according to the objective, 0.1-2 mass% is in the said liquid detergent composition. Preferably, 0.3 to 1.7 mass% is more preferable. When the content is less than 0.1% by mass, the foam quality may be deteriorated. When the content exceeds 2% by mass, precipitation may occur at a low temperature. On the other hand, when the content is within a more preferable range, it is advantageous in that the fineness of the foam and the low temperature stability are more excellent.

<(B) Amphoteric surfactant>
The amphoteric surfactant is blended mainly for the purpose of improving the foam quality (foam fineness, foam creaminess, etc.) and low-temperature stability of the liquid detergent composition.
The amphoteric surfactant is not particularly limited and can be appropriately selected from those used in ordinary detergents according to the purpose. For example, imidazoline type (amidoamine type), amide amino acid salt, carbobetaine type Examples thereof include amphoteric surfactants such as (alkylbetaine, alkylamidobetaine) and sulfobetaine type (alkylsulfobetaine, alkylhydroxysulfobetaine).
Examples of the imidazoline type amphoteric surfactant include stearoylamidoamine, coconut oil alkyl-N-hydroxyethylimidazolinium betaine, and the like. Examples of the carbobetaine-type amphoteric surfactants include alkylbetaines such as lauryl dimethylaminoacetic acid betaine, coconut oil alkyldimethylaminoacetic acid betaine, and stearyldimethylaminoacetic acid betaine. Alkylamide betaines include coconut oil fatty acid amidopropyl betaine. And lauric acid amidopropyl acetate betaine. Examples of the amphoteric surfactants of the sulfobetaine type include alkylsulfobetaines such as coconut oil fatty acid dimethylsulfopropylbetaine, and alkylhydroxysulfobetaines such as lauryldimethylaminohydroxysulfobetaine and laurylhydroxysulfobetaine. Among these, coconut oil fatty acid amidopropyl betaine and lauric acid amidopropyl acetate betaine are preferable in terms of excellent low-temperature stability.

The amphoteric surfactants may be used alone or in combination of two or more.
There is no restriction | limiting in particular as content of the said amphoteric surfactant, Although it can select suitably according to the objective, 0.4-18 mass% is preferable in the said liquid detergent composition, 4-13 mass % Is more preferable. When the content is less than 0.4% by mass, the low-temperature stability may be inferior, and when it exceeds 18% by mass, the skin may not be smooth. On the other hand, when the content is in a more preferable range, it is advantageous in that it is excellent in good foam quality, low-temperature stability, and mildness to the skin.

<(B) / (A)>
In the liquid detergent composition, the content of the (B) amphoteric surfactant with respect to the content of the (A) N-acylamino acid type anionic surfactant is (B) / (A ) = 2-15, 4-10 are preferable, and 5-9 are more preferable. When (B) / (A) is less than 2, there are problems such as poor low-temperature stability, and when it exceeds 15, there are problems such as poor foam quality. On the other hand, when (B) / (A) is in a more preferable range, it is advantageous in that it is more excellent in low-temperature stability and good foam quality.

<(A) + (B)>
In addition, the total content of the (A) N-acylamino acid type anionic surfactant and the (B) amphoteric surfactant in the liquid detergent composition is not particularly limited, and is dependent on the purpose. Although it can select suitably, (A) + (B) = 0.5-20 mass% is preferable, and 5-15 mass% is more preferable. If the total content is less than 0.5% by mass, the foam quality may be inferior, and if it exceeds 20% by mass, the mildness to the skin may be inferior. On the other hand, when the total content is in a more preferable range, it is advantageous in that it is excellent in foam quality and mildness to the skin.

<(C) Polyethylene glycol>
The polyethylene glycol is blended mainly for the purpose of improving the foam quality (fineness of foam, foam creaminess, etc.) of the liquid detergent composition.
Here, as the polyethylene glycol, those having an average molecular weight of 1000 to 20000 are used. Among them, those having an average molecular weight of 4000 to 20000 (specifically, for example, those having an average molecular weight of 4000, 6000, 20000) are preferably used, and those having an average molecular weight of 4000 to 6000 (specifically, for example, It is more preferable to use those having an average molecular weight of 4000 or 6000). When the average molecular weight is less than 1000, there are problems such as poor foam quality, and when it exceeds 20000, there are problems such as poor solubility in water and inferior handling during production. On the other hand, when the average molecular weight is within a more preferable range, it is advantageous in that it is excellent in foam quality and handling properties during production.
In addition, the measuring method of the said average molecular weight is quasi-drug raw material specification 2006 (Pharmaceutical Daily News) The test method listed in 1383 is followed. Specifically, the average molecular weight is measured as follows. About 6 g of a polyethylene glycol sample is accurately weighed and placed in an about 200 mL pressure-resistant stopper bottle, about 25 mL of pyridine is added, heated to dissolve, and allowed to cool. Separately, 42 g of phthalic anhydride is taken, added to a 1 L light-shielded stoppered bottle containing 300 mL of freshly distilled pyridine, and shaken vigorously to dissolve, then left for 16 hours or longer. 25 mL of this solution is accurately weighed, sealed in the pressure-proof stopper bottle, wrapped in a strong cloth, and placed in a water bath heated to 98 ± 2 ° C. in advance. At this time, the liquid in the bottle is immersed in a water bath. After maintaining at 98 ± 2 ° C. for 30 minutes, the bottle is removed from the water bath and allowed to cool in air to room temperature. Next, 50 mL of 0.5 mol / L sodium hydroxide solution is accurately added, and this solution is titrated with 0.5 mol / L sodium hydroxide solution (indicator: 5 drops of pyridine solution of phenolphthalein (1 → 100)). . However, the end point of titration is when the liquid exhibits a red color lasting 15 seconds. A blank test is performed in the same manner, and the average molecular weight is obtained by the following formula.
Average molecular weight = S × 4000 / (ab)
S: Amount of sample (g)
a: Consumption of 0.5 mol / L sodium hydroxide solution in the blank test (mL)
b: Consumption of the 0.5 mol / L sodium hydroxide solution in the sample test (mL)

The said polyethylene glycol may be used individually by 1 type, and may use 2 or more types together.
As content of the said polyethylene glycol, it is 0.05-5.0 mass% in the said liquid detergent composition, and 0.2-3.0 mass% is preferable. When the content is less than 0.05% by mass, there are problems such as poor foam quality, and when it exceeds 5.0% by mass, there are problems such as poor low-temperature stability. On the other hand, when the content is within a preferable range, it is advantageous in terms of excellent foam quality and low temperature stability.

<(C) / [(A) + (B)]>
In the liquid detergent composition, the content of (C) polyethylene glycol relative to the total content of (A) N-acylamino acid type anionic surfactant and (B) amphoteric surfactant is The ratio is preferably (C) / [(A) + (B)] = 0.01 to 1.0, and more preferably 0.04 to 0.2. When (C) / [(A) + (B)] is less than 0.01, the foam quality may be inferior, and when it exceeds 1.0, the low-temperature stability may be inferior. On the other hand, when (C) / [(A) + (B)] is in a more preferable range, it is advantageous in terms of excellent foam quality and low temperature stability.

<Other ingredients>
The liquid detergent composition can contain other components in addition to the components (A) to (C) as long as the effects of the present invention are not impaired. The other components are not particularly limited and can be appropriately selected according to the purpose from those used in ordinary detergents, such as oils, silicones, lower / higher alcohols, polyhydric alcohols, and the like. Alcohols, lanolin derivatives, protein derivatives, acrylic resin dispersions, drugs such as vitamins, bactericides, preservatives, pH adjusters, antioxidants, metal sequestering agents, UV absorbers, animal and plant extracts or their derivatives, pigments, Examples include fragrance (fragrance composition), pigment, inorganic powder, clay mineral, nylon, water-insoluble polymer powder such as polyethylene.

-Polyhydric alcohol-
There is no restriction | limiting in particular as said polyhydric alcohol, According to the objective, it can select suitably, For example, propylene glycol (PG), 1, 3- butylene glycol (BG), glycerol etc. are mentioned. By blending the polyhydric alcohol, it is possible to further improve the mildness to the skin and the foam quality of the liquid detergent composition.
The said polyhydric alcohol may be used individually by 1 type, and may use 2 or more types together.
There is no restriction | limiting in particular as content of the said polyhydric alcohol, Although it can select suitably according to the objective, 10-30 mass% is preferable in the said liquid detergent composition. When the content is less than 10% by mass, the mildness to the skin and the foam quality may be inferior. When the content exceeds 30% by mass, the skin may become sticky after rinsing or rinsing. There is.

-Perfume composition-
The said fragrance | flavor composition is a mixture which consists of a fragrance | flavor component, the solvent for fragrance | flavors, and a fragrance | flavor stabilizer.
The said fragrance | flavor composition may be used individually by 1 type, and may use 2 or more types together.
There is no restriction | limiting in particular as content of the said fragrance | flavor composition, Although it can select suitably according to the objective, 0.005-40 mass% is preferable in the said liquid detergent composition, 0.01-10 The mass% is more preferable.

  A list of perfume raw materials used as the perfume ingredients can be found in various documents such as “Perfume and Flavor Chemicals”, Vol. I and II, Stephen Arctander, Allured Pub. Co. (1994); “Synthetic perfume chemistry and commercial knowledge”, Motoichi Into, Chemical Industry Daily (1996); “Perfume and Flavor Materials of Natural Origin”, Stephen Arctander, Allred Pub. Co. (1994); “Aroma Encyclopedia”, edited by Japan Fragrance Association, Asakura Shoten (1989); , Danute Lajaujis Anonis, Allured Pub. Co. (1993) etc. For example, the said fragrance | flavor component can be suitably selected from the fragrance | flavor raw materials described in these literature.

Examples of the perfume solvent include ethanol, benzyl benzoate, acetin (triacetin), MMB acetate (3-methoxy-3-methylbutyl acetate), ethylene glycol dibutyrate, hexylene glycol, dibutyl sebacate, and deltile extra ( Isopropyl myristate), methyl carbitol (diethylene glycol monomethyl ether), carbitol (diethylene glycol monoethyl ether), TEG (triethylene glycol), benzyl benzoate, propylene glycol, diethyl phthalate, tripropylene glycol, aboline (dimethyl phthalate) , Deltyl prime (isopropyl palmitate), dipropylene glycol DPG-FC (dipropylene glycol), farnesene Dioctyl adipate, tributyrin (glyceryl tributanoate), hydrolite-5 (1,2-pentanediol), propylene glycol diacetate, cetyl acetate (hexadecyl acetate), ethyl abiate, avaline (methyl abieticate), citroflex A-2 (acetyl triethyl citrate), Citroflex A-4 (tributyl acetyl citrate), Citroflex No. 2 (triethyl citrate), Citroflex No. 4 (tributyl citrate), Durafix (methyl dihydroabietate), MITD (isotridecyl myristate), polylimonene (limonene polymer), 1,3-butylene glycol and the like.
As content of the said fragrance | flavor solvent, 0.1-99 mass% is preferable in the said fragrance | flavor composition, and 0.1-10 mass% is more preferable.

Examples of the fragrance stabilizer include dibutylhydroxytoluene, butylhydroxyanisole, vitamin E and its derivatives, catechin compounds, flavonoid compounds, polyphenol compounds, and the like. Among these, dibutylhydroxytoluene is preferable.
As content of the said fragrance | flavor stabilizer, 0.0001-10 mass% is preferable in the said fragrance | flavor composition, and 0.001-5 mass% is more preferable.

<Manufacturing>
There is no restriction | limiting in particular as a manufacturing method of the said liquid detergent composition, According to the objective, it can select suitably, For example, the said (A)-(C) component, the said other component, and water. It can be manufactured by mixing. More specifically, the liquid cleaning composition is obtained by sequentially adding the components (A) to (C) and the other components to water and stirring at room temperature (15 to 25 ° C.). Can do. There is no restriction | limiting in particular also as an apparatus used for the said stirring, According to the objective, it can select suitably, For example, the stirring apparatus provided with several stirring blades (a propeller, a turbine, a disper, etc.) which can mix shear force and the whole. Etc. can be used.
In producing the liquid detergent composition, each of the components may be used alone, or a mixture containing two or more components may be used.

<PH>
There is no restriction | limiting in particular in pH of the said liquid detergent composition, Although it can select suitably according to the objective, 4-7 are preferable and 5-7 are more preferable. When the pH is less than 4, it may be inferior in dischargeability from the former container and low-temperature stability, and when it is more than 7, it may be inferior in mildness to the skin. On the other hand, when the pH is within a more preferable range, it is advantageous in that it is excellent in low-temperature stability and mildness to the skin. The pH is a value measured at 25 ° C. using a pH meter (HM-30G / manufactured by Toa Denpa Kogyo Co., Ltd.).
The pH of the liquid detergent composition can be adjusted using, for example, a desired pH adjuster. There is no restriction | limiting in particular as said pH adjuster, Although it can select suitably according to the objective, For example, a citric acid etc. are suitable.

<Viscosity>
The liquid detergent composition is preferably liquid at normal temperature (15 to 25 ° C.).
The viscosity of the liquid detergent composition is not particularly limited and can be appropriately selected according to the purpose. More specifically, when using a former container and a porous membrane as described below, for example, When using a pump former container capable of discharging bubbles by pushing down the nozzle part and two 200-mesh porous membrane bodies, 1 to 30 mPa · s is preferable under the temperature conditions used, and 1 to 20 mPa -S is more preferable.
The liquid detergent composition tends to thicken at low temperatures, but in order to discharge and use as foam without problems even at low temperatures normally assumed in winter, etc., the same conditions as in low temperatures in winter, etc. For example, at 5 ° C., the viscosity is preferably 30 mPa · s or less, and more preferably 20 mPa · s or less.
In addition, the said viscosity is 25 degreeC, No. by the viscometer of Tokyo Keiki Co., Ltd. This is the value measured for 60 seconds at 30 rpm using 3 rotors.

<Container>
The liquid detergent composition is suitable as a liquid detergent composition for filling a former container in which the liquid detergent composition is discharged in the form of foam.
Examples of the former container include a non-gas type foam discharge container. The non-gas type foam discharge container is not particularly limited as long as the liquid detergent composition can be mixed with air and discharged in a foamed state. For example, the foam is discharged by manually squeezing the bottle body. Examples thereof include a squeeze foamer container that can be discharged, a pump foamer container that can discharge bubbles by pushing down the nozzle portion, and the like. As such a former container, for example, a former container manufactured by Yamato Steel Co., Ltd., Yoshino Kogyo Co., Ltd., or the like can be used. In addition, as the former container, for example, a former container described in JP-A-7-315463, JP-A-8-230961, and JP-A-2005-193972 can be used.

  The non-gas type foam discharge container usually has a porous film body for forming bubbles (the material is preferably a plastic material such as nylon, polyester, polyolefin, etc.), and the liquid detergent composition is the porous film. Bubbles are formed by passing through the body. There is no restriction | limiting in particular as a mesh of the said porous membrane body, According to the objective, it can select suitably, For example, 100 mesh or more is preferable, 100-400 mesh is more preferable, 200-350 mesh is especially preferable. Moreover, there is no restriction | limiting in particular as the number of the said porous membrane body, Although it can select suitably according to the objective, From a viewpoint of improving foam performance, 2-4 sheets are preferable.

<Application>
There is no restriction | limiting in particular as a use of the said liquid detergent composition, According to the objective, it can select suitably, For example, it can apply to skin cleansing agents, such as a body soap, a hand soap, and a face wash. Above all, the liquid detergent composition has excellent mildness to skin, low-temperature stability, and good foam quality, so that it is used for infants, young women, elderly people, dry skin, and sensitive skin. It is particularly suitable as a cleaning material.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited to these Examples. In the following Examples and Comparative Examples, unless otherwise specified, “%” represents “mass%” and the ratios represent mass ratios. In addition, the component amounts are all converted into pure amounts.

(Examples 1-16, Comparative Examples 1-8)
In accordance with the compositions shown in Tables 1 to 3 below, the liquid detergent compositions of Examples 1 to 16 and Comparative Examples 1 to 8 were prepared according to a conventional method. Specifically, components (A) to (C) and common components were sequentially added to purified water, stirred with a propeller, and prepared at room temperature (25 ° C.). The pH of each prepared liquid detergent composition was measured at 25 ° C. using a pH meter (HM-30G / manufactured by Toa Denpa Kogyo Co., Ltd.).
About each prepared liquid detergent composition, it is low temperature stability, the fineness of foam (goodness of foam), and the softness of the skin after washing (mildness to the skin) as follows. evaluated. A result is combined with Tables 1-3 and shown.

<Evaluation of low temperature stability>
A 50 ml hard transparent glass bottle was filled with the liquid detergent composition prepared above, stored at 5 ° C. for 1 week, and evaluated according to the following criteria.
-Evaluation criteria for low-temperature stability-
A: Appearance is transparent and there is no precipitate.
○: Very slightly turbid but no precipitate.
Δ: Slightly cloudy with little precipitates.
X: Many precipitates are recognized.

<Evaluation of fineness of foam>
A non-gas type pump former container (Yoshino Kogyo, 200 mesh, 2 sheets) is filled with 400 mL of the liquid detergent composition prepared above (capacity 500 mL container), and 1 push (about 1 g) is supplied from the former container. The fineness of the foam when it was picked up in the hand and the arm was washed was evaluated. The evaluation was performed by 10 professional panelists with high evaluation accuracy, and the average value of 10 persons was calculated for the points evaluated according to the following evaluation criteria. Based on the calculated average value, the fineness of the foam was determined according to the following criteria. For reference, FIG. 1 shows an example of the state of each foam of the liquid detergent composition determined as “「 ”,“ ◯ ”,“ Δ ”, or“ × ”according to the following criteria.
-Evaluation criteria for fineness of foam-
5 points: Very fine.
4 points: Slightly fine.
3 points: Normal.
2 points: Not fine.
1 point: Not fine.
-Judgment criteria for fineness of foam-
A: The average score of 10 panelists is 4.0 points or more.
A: The average score of 10 panelists is 3.0 or more and less than 4.0.
(Triangle | delta): The average score of 10 panelists is 2.0 points or more and less than 3.0 points.
X: The average score of 10 panelists is less than 2.0 points.

<Evaluation of skin roughness after washing>
10 sensitive skin ladies (special panelists) rinsed the forearm 10 times with the liquid detergent composition prepared above twice a day, rinsed for about 10 seconds, and continued for 10 days. Sensory evaluation was conducted on the lack of About the score evaluated on the following evaluation criteria, the average value of 10 persons was computed, and the non-sharpness of the skin after washing | cleaning was determined on the following criteria.
-Evaluation criteria for skin roughness after washing-
5 points: very moist.
4 points: Slightly moist.
3 points: Normal.
2 points: Slightly soft.
1 point: Very bulky.
-Judgment criteria for skin roughness after washing-
A: The average score of 10 panelists is 4.0 points or more.
A: The average score of 10 panelists is 3.0 or more and less than 4.0.
(Triangle | delta): The average score of 10 panelists is 2.0 points or more and less than 3.0 points.
X: The average score of 10 panelists is less than 2.0 points.

  From the results of Tables 1 to 3, the components (A) to (C) are included, the content of the component (C) is within a certain range, and the content of the component (B) relative to the content of the component (A) The liquid detergent compositions of Examples 1 to 16 in which the amount ((B) / (A)) is within a certain range are the liquid detergent compositions of Comparative Examples 1 to 8 that do not satisfy at least one of the above requirements. It was found that the liquid detergent composition was excellent in all of mildness to skin, low-temperature stability, and good foam quality as compared with products.

(Example 17: Anti-inflammatory agent-containing foam facial cleansing composition)
An anti-inflammatory agent-containing foam facial cleansing composition (foam cleansing agent) having the composition shown below was prepared by a conventional method.
mass(%)
Sodium N-cocoyl glutamate 1.00
Amidopropyl betaine laurate 9.00
Polyethylene glycol # 4000 1.00
Propylene glycol 15.00
Dipotassium glycyrrhizinate 0.10
Glycerin 10.00
Sodium benzoate 0.90
Citric acid appropriate amount (adjusted to pH 5)
Fragrance 0.10
Purified water balance
100.00

(Example 18: Disinfectant-containing foam cleaning composition)
A bactericide-containing foam cleaning composition (foam hand soap) having the following composition was prepared by a conventional method.
mass(%)
N-lauroyl-N-methyl-β-alanine sodium 2.00
Palm oil fatty acid amidopropyl betaine 13.00
Polyethylene glycol # 4000 3.00
Propylene glycol 15.00
Isopropyl methylphenol 0.10
Glycerin 10.00
Sodium benzoate 0.90
Citric acid appropriate amount (adjusted to pH 5)
Fragrance 0.10
Purified water balance
100.00

  Each evaluation was performed similarly to the above about the liquid detergent composition of Examples 17-18. The results are shown in Table 4. It turned out that the liquid detergent composition of Examples 17-18 is a liquid detergent composition excellent in all of mildness to skin, low-temperature stability, and good foam quality.

  In addition, the detail of each component used by the said Example and comparative example is as follows.

  The liquid detergent composition of the present invention can be widely applied to skin cleansing agents such as body soaps, hand soaps, facial cleansers, etc., among others, the liquid detergent composition is mild to the skin, has a low temperature. Since it is excellent in stability and foam quality, it is particularly suitable as a skin cleansing agent for infants, young women, elderly people, and people with dry skin or sensitive skin.

FIG. 1 shows an example of the state of each foam of the liquid detergent composition determined as “◎”, “◯”, “Δ”, “×” in the evaluation of the fineness of the foam in the examples. It is a photograph.

Claims (7)

(A) an N-acylamino acid type anionic surfactant;
(B) an amphoteric surfactant;
(C) polyethylene glycol having an average molecular weight of 1000 to 20000,
The (B) amphoteric interface with respect to the content of the (A) N-acylamino acid type anionic surfactant, wherein the content of the (C) polyethylene glycol is 0.05 to 5.0% by mass. Content of activator is mass ratio, (B) / (A) = 2-15, The liquid detergent composition characterized by the above-mentioned.   The content of (C) polyethylene glycol with respect to the total content of (A) N-acylamino acid type anionic surfactant and (B) amphoteric surfactant is (C) / [ The liquid cleaning composition according to claim 1, wherein (A) + (B)] = 0.01 to 1.0. (A) The content of the N-acylamino acid type anionic surfactant is 0.1% by mass to 2% by mass, and the content of the (B) amphoteric surfactant is 0.4% by mass to 18% by mass. The liquid detergent composition according to any one of claims 1 to 2. The (A) N-acylamino acid type anionic surfactant is at least one of N-lauroyl-N-methyl-β-alanine sodium and sodium N-cocoylglutamate. Liquid detergent composition. The liquid detergent composition according to any one of claims 1 to 4, wherein the pH is 4 to 7. The liquid detergent composition according to any one of claims 1 to 5, which is filled in a former container. A skin cleanser for dry skin or sensitive skin using the liquid detergent composition according to any one of claims 1 to 6.