JP6687966B2 - Liquid skin cleanser - Google Patents

Description

  The present invention relates to liquid skin cleansing agents.

BACKGROUND ART Conventionally, skin cleansing agents are required to have foaming, detergency, a refreshing feeling after washing, etc., and solid soaps mainly composed of alkali metal salts of higher fatty acids are used (for example, Patent Document 1 and Patent Document 1). 2).
However, the solid soap is slow to melt and is difficult to foam. In addition, it may become unusable until it is used up because it becomes dirty or its performance deteriorates during use.
On the other hand, a liquid skin cleanser is known as a means for solving such a problem (for example, Patent Document 3). The liquid skin cleanser can clean the skin more easily than solid soap.

JP, 2001-64691, A Japanese Patent Publication No. 2014-526436 Special table 2009-528588 gazette

However, the conventional liquid skin cleansing agent has a problem that it comes out of the container or is used too much. Further, due to recent market demand characteristics, soaps having higher cleaning properties have been demanded.
TECHNICAL FIELD The present invention relates to a liquid skin cleansing agent which is easy to take out an appropriate amount from a container, dissolves quickly, has excellent detergency, and provides a refreshing feeling.

  The present inventors use the fatty acid salt, other anionic surfactants and amphoteric surfactants as a cleaning component, and further use a water-soluble polymer and a carbonate in combination at a specific ratio to solve the above-mentioned problems. It was found that a liquid skin cleanser that solves the above problem can be obtained.

The present invention comprises the following components (A), (B), (C), (D), (E) and (F):
(A) Fatty acid salt 9 to 27% by mass,
(B) Anionic surfactant other than component (A) 0.3 to 3.5% by mass,
(C) Amphoteric surfactant 0.3 to 3.5% by mass,
(D) Water-soluble polymer 0.1 to 1.5% by mass,
(E) carbonate 1.5 to 6% by mass,
(F) A liquid skin cleansing agent containing water.

The present invention also relates to a method for producing the liquid skin cleansing agent, which comprises the following steps.
(Step 1) The unneutralized product of the component (A) and a part or all of the neutralizing agent, the component (D), and the component (F) are mixed so as to have a neutralization ratio of 95 to 100%. A step of obtaining a fatty acid salt-containing composition,
(Step 2) A step of mixing the fatty acid salt-containing composition obtained in Step 1 with the components (B), (C) and (E).

  The liquid skin cleansing agent of the present invention makes it easy to take out an appropriate amount from the container, and further, when the agent is taken out, the agent does not pull the thread, and further, melt-dissolving is quick, it is easy to spread, good foaming, and the detergency is good. Excellent and non-sticky. Moreover, the take-out property at a low temperature is also good. It is suitable to be used by filling a pouch container or a bottle container.

  The fatty acid salt of the component (A) is represented by the general formula (1)

(In the formula, R ¹ represents a linear or branched alkyl group or alkenyl group having 9 to 21 carbon atoms, and X represents an alkali metal, ammonium, ammonium derived from an alkanolamine, or a basic amino acid.)
What is represented by is preferable.
More specifically, for example, salts of lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, behenic acid and the like, among them, lauric acid, myristic acid, palmitin At least one selected from acid, stearic acid and oleic acid salts is preferable. Examples of these salts include alkali metals such as potassium; ammonium; ammoniums derived from alkanolamines such as monoethanolamine, diethanolamine and triethanolamine; basic amino acids such as arginine and lysine.

The fatty acid salt of the component (A) can be present in the composition by forming a fatty acid salt by mixing an unneutralized fatty acid and a neutralizing agent in the composition.
The neutralizing agent is a compound showing basicity, and examples thereof include sodium hydroxide, potassium hydroxide, triethanolamine, and basic amino acids. Among these, one selected from potassium hydroxide and sodium hydroxide is preferable from the viewpoint of improving the skin cleansing property and reducing the coloring property and odor of the liquid skin cleansing agent.

  The fatty acid salt of the component (A) can be used singly or in combination of two or more, and from the viewpoint of improving the ease of taking out the liquid skin cleansing agent from the container and the melt-dissolving property, the content of the fatty acid salt is As 9% by mass or more in the total composition, 9.5% by mass or more is preferable, 11% by mass or more is more preferable, 14% by mass or more is further preferable, 27% by mass or less, and 25% by mass or less is The content is preferably 22% by mass or less, more preferably 18% by mass or less. Further, the content of the component (A) is 9 to 27 mass% in the whole composition as a fatty acid, and from the same viewpoint, 9.5 to 25 mass% is preferable, and 11 to 22 mass% is more preferable. 14 to 18 mass% is more preferable.

  The anionic surfactant as the component (B) is not limited to the component (A) and may be any one used in ordinary skin cleansing agents, and examples thereof include alkyl (ether) sulfate, allyl (ether) sulfate, Alkyl ether carboxylate, alkyl benzene sulfonate, alkane sulfonate, olefin sulfonate, alkyl ether sulfonate, glycerin ether sulfonate, α-methyl ester sulfonate, sulfo fatty acid salt, alkyl sulfate, fatty alcohol Ether sulfate, glycerin ether sulfate, hydroxy mixed ether sulfate, monoglyceride (ether) sulfate, fatty acid amide (ether) sulfate, monoalkylsulfosuccinate, dialkylsulfosuccinate, monoalkylsulfosuccinamide, Dialkyl sulfosucci Amidates, sulfotriglycerides, amide ether carboxylates and salts thereof, fatty acid isethionates, fatty acid sarcosinates, fatty acid taurides; N-acyl amino acid salts such as acyl lactylates, acyl tartrates, acyl glutamate, acyl aspartates; alkyls Examples include oligoglucoside sulfates, protein fatty acid condensates (wheat-based plant products), alkyl (ether) phosphates, and the like.

Of these, at least one selected from alkyl (ether) sulfates and alkyl ether carboxylates is preferable, and one containing both is more preferable, from the viewpoints of improving low-temperature stability, detergency and dissolution collapse. The liquid skin cleansing agent of the present invention containing these components (B), particularly at least one selected from alkyl (ether) sulfates and alkyl ether carboxylates, is excellent in low temperature stability, and therefore, at low temperatures. The liquid skin cleanser of (3) can be easily taken out from the container.
In the present invention, the removability of the liquid skin cleanser from the container means that an appropriate amount of the liquid skin cleanser can be easily taken out from the container and that the drug does not pull a thread when the drug is taken out. means.
Generally, a surfactant contributes to detergency, but in a composition containing the surfactant, the surfactant forms string-like micelles, so that the agent tends to pull threads when the agent is taken out. However, in the present invention, even if it contains a surfactant, it is excellent in detergency due to the combination with a specific component, and it is easy to take out an appropriate amount of the liquid skin cleansing agent from the container, and further, taking out the agent. In this case, the agent has a unique effect of not pulling the thread.

  The component (B) can be used singly or in combination of two or more, and the content is 0.3% by mass in the whole composition from the viewpoint of improving low temperature stability, detergency, and melt-disintegration property. Or more, 0.4 mass% or more is preferable, 0.5 mass% or more is more preferable, 0.7 mass% or more is still more preferable, 3.5 mass% or less, 3.3 mass% or less is preferable. 3.2 mass% or less is more preferable, and 2.5 mass% or less is still more preferable. In addition, the content of the component (B) is 0.3 to 3.5% by mass in the entire composition, preferably 0.4 to 3.3% by mass, and more preferably 0.5 to 3.2% by mass. Preferably, 0.7 to 2.5 mass% is more preferable.

The amphoteric surfactant as the component (C) may be any as long as it is used in a usual skin cleansing agent, and examples thereof include betaine acetate type surfactants such as lauryl dimethylamino acetic acid betaine and lauryl dimethyl amine oxide. Amine oxide type surfactants, imidazolinium betaine type surfactants such as 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, amide betaine type surfactants such as lauric acid amidopropyl betaine, lauryl Examples thereof include sulfobetaine-type surfactants such as hydroxysulfobetaine.
Of these, at least one selected from sulfobetaine-type surfactants and amidobetaine-type surfactants is preferable from the viewpoint of improving low-temperature stability, detergency, non-stickiness, and ease of dissolution, and sulfobetaine-type surfactants are preferable. Among the surfactants, lauryl hydroxysulfobetaine is preferable, and among the amidobetaine-type surfactants, amidopropyl betaine laurate is preferable.

  The component (C) can be used singly or in combination of two or more, and from the viewpoint of improving the low-temperature stability, detergency, non-greasiness, and melt-dissolvability of the liquid skin cleansing agent, the content thereof is Is 0.3% by mass or more in the entire composition, preferably 0.4% by mass or more, more preferably 0.5% by mass or more, further preferably 0.7% by mass or more, and 0.9% by mass or more. Is more preferably 3.5% by mass or less, 3.3% by mass or less, 3.1% by mass or less is more preferable, 2.9% by mass or less is more preferable, and 2.7% by mass or less is Even more preferable. In addition, the content of the component (C) is 0.3 to 3.5% by mass in the entire composition, preferably 0.4 to 3.3% by mass, and more preferably 0.5 to 3.1% by mass. Preferably, 0.7 to 2.9 mass% is more preferable, and 0.9 to 2.7 mass% is even more preferable.

  In the present invention, the mass ratio (A) / (C) of the component (A) to the component (C) is 2 from the viewpoint of improving the skin cleansing property and reducing the coloring property and odor of the liquid skin cleanser. The above is preferable, 4 or more is more preferable, 6 or more is further preferable, 35 or less is preferable, 20 or less is more preferable, and 12 or less is further preferable. The mass ratio (A) / (C) of the component (A) to the component (C) is preferably 2-35, more preferably 4-20, and even more preferably 6-12.

The water-soluble polymer as the component (D) may be any water-soluble polymer as long as it is used in a usual skin cleansing agent.
Examples of the water-soluble polymer include copolymers of acrylic acid / alkyl (meth) acrylate such as acrylic acid / alkyl acrylate crosspolymer, cellulose to which a hydroxyethyl group or a hydroxypropyl group is added, and liquid skin cleansing agents. From the viewpoint of improving the appropriate removability of the agent and the low temperature stability, it is mentioned as a suitable water-soluble polymer.
Examples of acrylic acid / alkyl (meth) acrylate copolymers include Pemulen TR-1, Pemulen TR-2, Carbopol ETD2020, Carbopol 1382, Carbopol 1342 (above, manufactured by Lubrizol Advanced Materials), AQUPEC HV. Commercially available products such as -501ER (manufactured by Sumitomo Seika) can be used.

Further, the cellulose to which a hydroxyethyl group or a hydroxypropyl group is added is one in which a part of hydrogen atoms in the hydroxyl group of cellulose is substituted with a hydroxyethyl group or a hydroxypropyl group, and has a substituent other than these. May be.
Specific examples thereof include hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose and the like.
These are obtained by reacting cellulose with caustic soda to give alkali cellulose, and then allowing methyl chloride, monochloroacetic acid, ethylene oxide, propylene oxide, etc. to act on the hydrogen atom in the hydroxyl group of cellulose to a hydroxyethyl group, a hydroxypropyl group, a methyl group, It is obtained by substituting a carboxymethyl group or the like.

These celluloses have an average degree of substitution of more than 0, preferably 0.5 or more, more preferably 3 or less, and even more preferably 2 or less, from the viewpoint of improving foamability and foam sustainability. Further, the weight average molecular weight is preferably 200,000 or more, more preferably 500,000 or more, and more preferably 650,000 or more, from the viewpoint of improving the solubility in the liquid detergent composition, the foamability and the foam persistence. It is preferably 3,000,000 or less, more preferably 2,000,000 or less, still more preferably 1,600,000 or less.
In the present invention, the average degree of substitution is determined by NMR, and the weight average molecular weight uses a gel permeation chromatography (GPC) -multi-angle laser light scattering detector (MALLS) system with polyethylene oxide as a standard substance. Measured by

  As the cellulose to which a hydroxyethyl group or a hydroxypropyl group is added, hydroxyethyl cellulose and hydroxypropylmethyl cellulose are preferable, and those having an average degree of substitution of 0.5 to 2 and a weight average molecular weight of 650,000 to 1,600,000 are preferable. .

  Examples of the cellulose to which a hydroxyethyl group or a hydroxypropyl group is added include, in the case of hydroxyethyl cellulose, CELLOSIZE QP52000H (manufactured by Dow Chemical Co.), HEC Daicel SE400, SE500, SE600, SE850, SE900 (above, manufactured by Daicel Finechem Co., Ltd.). In hydroxypropylmethylcellulose, commercially available METOLOSE 60SH, 65SH (above, manufactured by Shin-Etsu Chemical Co., Ltd.), BENECEL E50, E4M, E10M, F4MC, K99C, K4M, K15M, K35M, K100M, K200M (above, manufactured by ASHLAND). Goods can be used.

  The component (D) can be used singly or in combination of two or more, and from the viewpoint of improving the appropriate removability and low temperature stability of the liquid skin cleanser, the content is 0. 1 mass% or more, 0.2 mass% or more is preferable, 0.25 mass% or more is more preferable, 0.27 mass% or more is further preferable, 1.5 mass% or less, 1.3 mass% The following is preferable, 1 mass% or less is more preferable, and 0.8 mass% or less is further preferable. From the same viewpoint, the content of the component (D) is 0.1 to 1.5% by mass in the entire composition, preferably 0.2 to 1.3% by mass, and 0.25 to 1% by mass. % Is more preferable, and 0.27 to 0.8 mass% is further preferable.

Examples of the carbonate of the component (E) include alkali metal salts such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate; alkali metal salts such as calcium carbonate, magnesium carbonate, magnesium hydrogen carbonate; ammonium carbonate, carbonic acid. Examples thereof include ammonium salts such as ammonium hydrogen.
Among these, at least one selected from sodium carbonate, potassium carbonate, sodium hydrogencarbonate and potassium hydrogencarbonate from the viewpoint that the property of the agent is water-soluble, and from the viewpoint of appropriately taking out the agent and improving the cleaning property. preferable.

  The component (E) can be used singly or in combination of two or more. From the viewpoint of detergency and appropriate ease of taking out the liquid skin cleansing agent, the content is 1.5 mass in the entire composition. % Or more, 1.6% by mass or more is preferable, 1.8% by mass or more is more preferable, 2.5% by mass or more is further preferable, 6% by mass or less, and 5.5% by mass or less is preferable, 5 mass% or less is more preferable, and 4.5 mass% or less is still more preferable. In addition, the content of the component (E) is 1.5 to 6% by mass in the entire composition, preferably 1.6 to 5.5% by mass, more preferably 1.8 to 5% by mass, and 2. 5 to 4.5 mass% is more preferable.

  In the present invention, the total content of the components (D) and (E) is 1.5 mass% in the entire composition from the viewpoint of improving the skin cleansing property and reducing the coloring property and odor of the liquid skin cleansing agent. % Or more is preferable, 2% by mass or more is more preferable, 3% by mass or more is further preferable, 7% by mass or less is preferable, 6% by mass or less is more preferable, and 5% by mass or less is further preferable. In addition, the total content of the components (D) and (E) is preferably 1.5 to 7% by mass, more preferably 2 to 6% by mass, and further preferably 3 to 5% by mass in the total composition.

Water of the component (F) is used as a solvent, and the content is preferably 40% by mass or more, more preferably 50% by mass or more, further preferably 54% by mass or more, and preferably 90% by mass or less in the entire composition. It is more preferably 85% by mass or less, and further preferably 80% by mass or less. Further, the content of the component (F) is preferably 40 to 90% by mass, more preferably 50 to 85% by mass, and further preferably 54 to 80% by mass in the entire composition.
In the present invention, since the composition (E) is contained in the composition, when an acid is present in the composition, the carbonate salt of the component (E) reacts with the acid to generate carbon dioxide gas, which is appropriate. Viscosity cannot be realized, and it becomes difficult to achieve both appropriate ease of taking out and dissolution collapse. Therefore, when the component (D) is an acid as well as the component (A), it is preferably neutralized.
The neutralization ratio with respect to the total of the component (A) and the component (D) is preferably 0.95 to 1.05, and is preferably 0.98 to 1.02, from the viewpoint of improving both the appropriate ease of taking out and the dissolution collapse property. Is more preferable.

The liquid skin cleansing agent of the present invention further comprises components used in ordinary cleansing agents, for example, surfactants other than components (A), (B) and (C), moisturizers, oily components, bactericides, It may contain inflammatory agents, preservatives, chelating agents, thickening agents, salts, pearling agents, scrub agents, fragrances, cooling agents, dyes, ultraviolet absorbers, antioxidants, plant extracts and the like.
The liquid skin cleansing agent of the present invention preferably further contains an ester compound from the viewpoint of improving the ease of removal from the container and the melt-dissolving property, and among the ester compounds, glycol difatty acid ester is preferred, and ethylene At least one selected from glycol diolate, ethylene glycol dilaurate, ethylene glycol distearate, propylene glycol dilaurate and propylene glycol distearate is more preferable, and selected from ethylene glycol diolate, ethylene glycol dilaurate and ethylene glycol distearate. At least one kind is more preferable.
From the same viewpoint, the content of the ester compound is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.4% by mass or more, and 4% by mass or less in the entire composition. Is preferable, 3 mass% or less is more preferable, and 2 mass% or less is further preferable. In addition, the content of the ester compound is preferably 0.01 to 4% by mass, more preferably 0.1 to 3% by mass, and further preferably 0.4 to 2% by mass in the total composition.

The liquid skin cleansing agent of the present invention is produced by mixing the ingredients in a conventional manner.
For example, it can be manufactured by a method including the following steps 1 and 2.
(Step 1) The unneutralized product of the component (A) and a part or all of the neutralizing agent, the component (D), and the component (F) are mixed so as to have a neutralization ratio of 95 to 100%. A step of obtaining a fatty acid salt-containing composition,
(Step 2) A step of mixing the fatty acid salt-containing composition obtained in Step 1 with the components (B), (C) and (E).
In this way, by neutralizing the component (A) and the component (D) in advance and mixing them with the component (E), generation of carbon dioxide gas can be minimized, and proper removal and meltability can be achieved. A liquid skin cleansing agent having

As the container for accommodating the liquid skin cleansing agent of the present invention, various containers such as bottles, tubes, pumps and pouches can be selected depending on the viscosity and capacity. As the material, any of plastic, glass, metal, or a composite of these can be used. A pouch container or a bottle container is preferable because it is suitable for taking out the liquid skin cleanser and is economical.
The pouch container is, for example, a resin body film in which an outer resin film layer having excellent printability and a barrier property against contents and an inner resin film layer having excellent sealing property (heat sealing property, etc.) are appropriately laminated. A flat bag-like container made by sealing the left and right edges and the bottom edge of each other (heat sealing, etc.), or another resin film is sandwiched between the resin films and the peripheral edge is sealed. It refers to a self-supporting bag-shaped container (so-called standing pouch) that is made.
From the viewpoint of appropriate ease of taking out the skin cleanser, a pouch container with a spout is preferable.

  The bottle container can be used without particular limitation. The material for the bottle container is appropriately selected from polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyvinyl chloride, ethylene-vinyl alcohol resin, acrylonitrile-styrene resin, ABS resin, polyamide resin and other resin containers, and glass containers. . Further, the structure of the bottle container is preferably a single layer or a layered structure of two or more layers.

  The liquid skin cleansing agent of the present invention is characterized in that it is reasonably easy to take out and that the agent does not pull a thread when taking out the agent. The ease of removing the liquid skin cleanser can be improved by decreasing the viscosity. However, there arises a problem that the liquid skin cleansing agent easily comes out of the container. If the viscosity is increased to suppress it, the liquid skin cleanser will become difficult to take out, the thread will be easier to pull the thread when taking out the agent, and the agent will not fit well when picked up by hand. , Causing a problem that it is difficult to stretch. However, in the present invention, by adopting the above-mentioned constitution, while the liquid skin cleansing agent can be easily taken out appropriately, it is possible to prevent the liquid skin cleansing agent from flowing out of the container, to suppress the agent from pulling the thread, and to dissolve the melt. Since it has excellent properties, it has an excellent effect that the agent can be easily spread. In the present invention, “moderately easy to take out” means that the agent can be easily taken out from the container, but the liquid skin cleansing agent does not spill out of the container at once. The liquid skin cleansing agent of the present invention can achieve such performance by adjusting the viscosity so as to have an appropriate viscosity according to the container used.

The liquid skin cleansing agent of the present invention is in a liquid state at 30 ° C, and preferably has a viscosity at 30 ° C of 1000 to 100000 mPa · s, and preferably 1500 to 90000 mPa · s, from the viewpoint of improving appropriate ease of taking out. Is more preferable, 1800-80000 mPa · s is still more preferable, and 2000-70000 mPa · s is still more preferable.
When the pouch container is filled with the liquid skin cleansing agent of the present invention, the viscosity at 30 ° C. is preferably 5,000 to 100,000 mPa · s, more preferably 7,000 to 70,000 mPa · s, and further preferably 9000 to 40,000 mPa · s. It is more preferably 10,000 to 20,000 mPa · s.
Further, when used by being filled in a bottle container, the viscosity at 30 ° C. is preferably 1000 to 6000 mPa · s, more preferably 1500 to 5500 mPa · s, and further preferably 2000 to 6000 mPa · s.
In the present invention, the viscosity is measured at 30 ° C using a B-type viscometer / VISCOMETER TVB-10M (manufactured by TOKI SANGYO CO., LTD).

The liquid skin cleansing agent of the present invention is suitable, for example, as a face wash, body soap, hand soap, etc., and body soap is more preferable.
The liquid skin cleansing agent of the present invention can be used by applying it to the skin, more specifically to any of the scalp, face, body, limbs, etc., and washing with water.

  Regarding the embodiments described above, the present invention further discloses the following compositions.

<1> The following components (A), (B), (C), (D), (E) and (F):
(A) Fatty acid salt 9 to 27% by mass,
(B) Anionic surfactant other than component (A) 0.3 to 3.5% by mass,
(C) Amphoteric surfactant 0.3 to 3.5% by mass,
(D) Water-soluble polymer 0.1 to 1.5% by mass,
(E) carbonate 1.5 to 6% by mass,
(F) A liquid skin cleanser containing water.

<2> The fatty acid salt of the component (A) is preferably the general formula (1).

(In the formula, R ¹ represents a linear or branched alkyl group or alkenyl group having 9 to 21 carbon atoms, and X represents an alkali metal, ammonium, ammonium derived from an alkanolamine, or a basic amino acid.)
Which is represented by, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, at least one selected from the salts of behenic acid is more preferable, lauric acid, myristic acid, The liquid skin cleansing agent according to <1>, wherein at least one selected from salts of palmitic acid, stearic acid, and oleic acid is more preferable.

<3> The content of the component (A) is preferably 9.5% by mass or more, more preferably 11% by mass or more, further preferably 14% by mass or more, and further preferably 25% by mass as a fatty acid in the entire composition. % Or less, more preferably 22% by mass or less, and further preferably 18% by mass or less, <1> or <2>.
<4> The anionic surfactant as the component (B) is preferably at least one selected from alkyl (ether) sulfates and alkyl ether carboxylates, and more preferably those containing both. ~ The liquid skin cleansing agent according to any one of <3>.
The content of the <5> component (B) is preferably 0.4% by mass or more in the entire composition, more preferably 0.5% by mass or more, further preferably 0.7% by mass or more, 3 0.3 mass% or less is preferable, 3.2 mass% or less is more preferable, 2.5 mass% or less is further more preferable, The liquid skin cleansing agent of any one of said <1>-<4>.

<6> The amphoteric surfactant as the component (C) is preferably at least one selected from sulfobetaine-type surfactants and amidobetaine-type surfactants, and is lauryl hydroxysulfobetaine or lauric acid amidopropyl betaine. More preferably, the liquid skin cleansing agent according to any one of <1> to <5>.
The content of the <7> component (C) is preferably 0.4% by mass or more in the entire composition, more preferably 0.5% by mass or more, further preferably 0.7% by mass or more, 0 1.9% by mass or more is more preferable, 3.3% by mass or less is more preferable, 3.1% by mass or less is more preferable, 2.9% by mass or less is more preferable, and 2.7% by mass or less is further more preferable. The liquid skin cleansing agent according to any one of <1> to <6>.
<8> The mass ratio (A) / (C) of the component (A) to the component (C) is preferably 2 or more, more preferably 4 or more, further preferably 6 or more, and preferably 35 or less, 20 or less is more preferable, and 12 or less is still more preferable, The liquid skin cleansing agent of any one of said <1>-<7>.

<9> The water-soluble polymer as the component (D) is preferably at least one selected from copolymers of acrylic acid / alkyl (meth) acrylate, cellulose having a hydroxyethyl group and a hydroxypropyl group added thereto. The liquid skin cleansing agent according to any one of <1> to <8>.
The content of the <10> component (D) is preferably 0.2% by mass or more in the entire composition, more preferably 0.25% by mass or more, further preferably 0.27% by mass or more, 1 0.3 mass% or less is preferable, 1 mass% or less is more preferable, 0.8 mass% or less is still more preferable, The liquid skin cleansing agent of any one of said <1>-<9>.
<11> The carbonate of the component (E) is preferably at least one selected from sodium carbonate, potassium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate, according to any one of the above items <1> to <10>. Liquid skin cleanser.
The content of the <12> component (E) is preferably 1.6% by mass or more in the entire composition, more preferably 1.8% by mass or more, further preferably 2.5% by mass or more, and 5 0.5 mass% or less is preferable, 5 mass% or less is more preferable, 4.5 mass% or less is further more preferable, The liquid skin cleansing agent of any one of said <1>-<11>.

<13> The total content of components (D) and (E) is preferably 1.5% by mass or more in the entire composition, more preferably 2% by mass or more, further preferably 3% by mass or more, 7 mass% or less is preferable, 6 mass% or less is more preferable, 5 mass% or less is still more preferable, The liquid skin cleansing agent of any one of said <1>-<12>.
<14> The content of the component (F) water is preferably 40% by mass or more, more preferably 50% by mass or more, further preferably 54% by mass or more, and 90% by mass or less in the entire composition. The liquid skin cleansing agent according to any one of the above items <1> to <13>, preferably 85% by mass or less, more preferably 80% by mass or less.
<15> The neutralization rate with respect to the total of the component (A) and the component (D) is preferably 0.95 to 1.05, and more preferably 0.98 to 1.02. 14> The liquid skin cleansing agent according to any one of 14>.

<16> Furthermore, it is preferable to contain an ester compound, and it is more preferable to contain a glycol difatty acid ester. Ethylene glycol dioleate, ethylene glycol dilaurate, ethylene glycol distearate, propylene glycol dilaurate and propylene glycol distearate. The liquid skin cleansing according to any one of <1> to <15>, wherein at least one selected from the group consisting of ethylene glycol diolate, ethylene glycol dilaurate and ethylene glycol distearate is more preferred. Agent.
The content of the <17> ester compound is preferably 0.01% by mass or more in the entire composition, more preferably 0.1% by mass or more, further preferably 0.4% by mass or more, and 4% by mass. The following is preferable, 3% by mass or less is more preferable, and 2% by mass or less is further preferable, and the liquid skin cleansing agent according to <16>.

<18> The viscosity at 30 ° C. is preferably 1000 to 100000 mPa · s, more preferably 1500 to 90000 mPa · s, further preferably 1800 to 80000 mPa · s, and further preferably 2000 to 70000 mPa · s. The liquid skin cleansing agent according to any one of 1> to <17>.
<19> Used in a pouch container after being filled, the viscosity at 30 ° C. is preferably 5,000 to 100,000 mPa · s, more preferably 7,000 to 70,000 mPa · s, further preferably 9000 to 40,000 mPa · s, and more preferably 10,000 to The liquid skin cleansing agent according to any one of <1> to <18>, wherein 20000 mPa · s is further preferable.
<20> Used by filling a bottle container, the viscosity at 30 ° C. is preferably 1000 to 6000 mPa · s, more preferably 1500 to 5500 mPa · s, and further preferably 2000 to 6000 mPa · s. > The liquid skin cleansing agent according to any one of <18>.

<21> The method for producing a liquid skin cleansing agent according to any one of <1> to <20>, which includes the following Step 1 and Step 2.
(Step 1) The unneutralized product of the component (A) and a part or all of the neutralizing agent, the component (D), and the component (F) are mixed so as to have a neutralization ratio of 95 to 100%. A step of obtaining a fatty acid salt-containing composition,
(Step 2) A step of mixing the fatty acid salt-containing composition obtained in Step 1 with the components (B), (C) and (E).

Examples 1-1 to 1-26, Comparative Examples 1-1 to 1-10 (liquid skin cleanser in pouch container)
The liquid skin cleansing agents having the compositions shown in Tables 1 to 3 were manufactured, the viscosity was measured, and the removal property (discharging property, presence / absence of breakage), easiness of dissolution, low temperature stability, detergency and stickiness were evaluated. The lack was evaluated. The results are also shown in Tables 1 to 3.

(Production method)
(F) Potassium hydroxide (neutralizing agent) was added to part of the water, and the mixture was heated to 80 ° C. The fatty acid (A) and the water-soluble polymer (D) were heated and dissolved at 80 ° C. to sufficiently disperse the component (D). The (A) / (D) mixture heated and dissolved was added to the 80 ° C. aqueous potassium hydroxide solution prepared above. It was stirred for about 1 hour until it became uniform. Thereafter, therein, (E) carbonate was dissolved in 80 ° C. water (the balance of (F) water), ethylene glycol distearate was then added, and the obtained aqueous solution was added. After cooling to 40 ° C. with stirring, component (B), component (C) and perfume were added. While stirring, the mixture was cooled to room temperature (25 ° C) to obtain a liquid skin cleanser.
70 g of the obtained liquid skin cleansing agent was filled in a pouch container (a pouch container with a discharge port of 5 mmφ (vertical 140 × horizontal 87 mm)).

(Evaluation methods)
(1) Viscosity measurement:
Approximately 50 g of each liquid skin cleanser was filled in a container (screw tube (with cap / packing) transparent NO.7 50 mL 35 × 78 × 20 mm (Maruemu Co., Ltd.)) so that air bubbles did not enter, and a water bath at 30 ° C. was set. The temperature was adjusted by allowing it to stand for about 1 hour, and then the viscosity was measured at a measurement time of 1 minute. A B-type viscometer / VISCOMETER TVB-10M (manufactured by TOKI SANGYO CO., LTD) was used as a viscosity meter.
First, the measurement is performed under the condition (i), and if the measured value is within the accuracy range and a stable measured value is obtained, it is adopted as the measured value. However, if the measured value is outside the accuracy range, or if stable measurement values cannot be obtained due to the upper and lower limits of the accuracy range, measure under the condition (ii). Repeat this operation to obtain a stable measured value. The measurement time of the composition at each rotation speed was 1 minute in all cases.
(i) No. M4: 6 rpm
(ii) No. M4: 12 rpm
(iii) No. M4: 30 rpm
(iv) No. M3: 30 rpm
(v) No. M2: 30 rpm
(iv) No. M1: 30 rpm

(2-1) Removability of Agent (Dischargeability):
3 specialist panelists hold the container with the discharge port side vertical to the palm under the condition of 25 ° C, and when 2.5g of liquid skin cleanser is taken out by pushing lightly, it is easy to take out the agent from the container. Was evaluated according to the following criteria. The average value of the results of 3 panelists was used as the evaluation result of the liquid skin cleanser.
5: Not hard, not loose and easy to eject.
4: Slightly hard or slightly loose, but easy to eject.
3: Hard or loose but easy to eject.
2: Hard or loose and slightly difficult to eject.
1: Difficult to eject due to being too hard or too loose.

(2-2) Removability of agent (presence or absence of break):
Under the condition of 25 ° C, each of the three specialized panelists held the container with the discharge port side vertically to the palm, and when one push was applied to take out 2.5 g of the liquid skin cleanser, it was taken out onto the palm. When the dispensed agent was released from the palm of the container, the lack of spinnability of the agent (there was breakage of the agent) was evaluated according to the following criteria. Of the results of the three panelists, the one with more evaluation results was judged as the extractability (presence or absence) of the agent.
◯: The agent does not pull the thread and can be easily cut out from the container.
X: The agent pulls the thread and cannot be easily cut from the container.

(3) Easiness of melting:
Three expert panelists took out 0.5 g of liquid skin cleanser to the palm, added 2 g of water, and rubbed their hands 10 times. The easiness of melting was 5; When it was very slow, it was set to 1 and evaluated in 5 levels. The average value of the results of 3 panelists was used as the evaluation result of the liquid skin cleanser.

(4) Low temperature (10 ° C) stability:
The liquid skin cleansing agent filled in the container was stored at 10 ° C. for 1 week by three specialized panelists, and the ease of taking out the agent at 10 ° C. was evaluated. (2-1) Agent take-out property (discharging property) The ejection property closest to the evaluation 5 in the test was set to 5, and the farthest one was set to 1, and the evaluation was made in 5 stages.
The average value of the results of 3 panelists was used as the evaluation result of the liquid skin cleanser.

(5) Detergency:
3 specialized panelists apply 20 μL of carbon black-colored model comedo sebum to a 3.5 cmφ circle on the forearm, and after drying for 30 minutes, 1 g of a 2.5 mass% aqueous solution of a liquid skin cleanser is used. Gently massage with your index finger in a circular motion and rinse thoroughly with tap water. The state after cleaning was rated as 5 on the condition that there was no stain at all and 1 on the condition that there was no stain at all. The average value of the results of 3 panelists was used as the evaluation result of the liquid skin cleanser.

(6) Non-stickiness:
Three specialized panelists washed one arm's forearm with 0.5 g of a liquid skin cleanser, and evaluated the non-stickiness after towel drying. Evaluation was made on a scale of 5 with 5 being a non-sticky state and 1 being a very sticky state. The average value of the results of 3 panelists was used as the evaluation result of the liquid skin cleanser.

Examples 2-1 to 2-21, Comparative Examples 2-1 to 2-9 (liquid skin cleansing agents in bottle containers)
The liquid skin cleansing agents having the compositions shown in Tables 3 to 6 were produced, the viscosity was measured in the same manner as in Example 1, and the extractability (discharging property, presence or absence of breakage) of the agent, ease of dissolution, and low temperature. The stability, detergency and non-stickiness were evaluated. The results are also shown in Tables 3 to 6.

(Production method)
A liquid skin cleanser was produced in the same manner as in Example 1, and 100 g of the obtained liquid skin cleanser was filled in a bottle container (3 mmφ discharge port, diameter 5 cm, height 12 cm).

  Each of the liquid skin cleansing agents of Examples 1-1 to 1-26 and 2-1 to 2-21 is suitable as a liquid skin cleansing agent in a pouch container or a liquid skin cleansing agent in a bottle container. Further, the agent was easy to take out, quickly melted and collapsed, easy to spread, excellent in cleaning power, non-sticky, and good in low temperature stability. Further, after the washing, all the expert panelists who were the subjects of this test felt that the skin was soft and finished.

Examples 3-1 and 3-2
In the same manner as in Examples 1-1 to 2-21, skin cleansing agents having the compositions shown in Tables 7 and 8 were produced.
All the obtained liquid skin cleansing agents are suitable as liquid skin cleansing agents in bottles. Further, the agent was easy to take out, quickly melted and collapsed, easy to spread, excellent in cleaning power, non-sticky, and good in low temperature stability. Further, after the washing, all the expert panelists who were the subjects of this test felt that the skin was soft and finished.

Claims (14)

The following components (A), (B), (C), (D), (E) and (F):
(A) Fatty acid salt 9 to 27% by mass,
(B) Anionic surfactant other than component (A) 0.3 to 3.5% by mass,
(C) Amphoteric surfactant 0.3 to 3.5% by mass,
(D) Water-soluble polymer 0.1 to 1.5% by mass,
(E) carbonate 1.5 to 6% by mass,
(F) A liquid skin cleanser containing water and having a total content (D) + (E) of components (D) and (E) of 1.5 to 7% by mass.   The liquid skin cleansing agent according to claim 1, wherein the total content (D) + (E) of the components (D) and (E) is 2 to 6% by mass.   The liquid skin cleansing agent according to claim 1 or 2, wherein the content of the component (A) is 14 to 18% by mass.   The liquid skin cleansing agent according to any one of claims 1 to 3, wherein the content of the component (B) is 0.7 to 2.5% by mass.   The liquid skin cleansing agent according to claim 1, which has a viscosity at 30 ° C. of 1000 to 100000 mPa · s.   The liquid skin cleansing agent according to any one of claims 1 to 5, which has a viscosity of 5,000 to 100,000 mPa · s at 30 ° C and is used by being filled in a pouch container.   The liquid skin cleansing agent according to any one of claims 1 to 5, which has a viscosity at 30 ° C of 1000 to 6000 mPa · s and is used by being filled in a bottle container.   The liquid skin cleansing agent according to any one of claims 1 to 7, wherein the component (B) is at least one selected from alkyl (ether) sulfates and alkyl ether carboxylates.   The liquid skin cleansing agent according to any one of claims 1 to 8, wherein the component (C) is at least one selected from a sulfobetaine type surfactant and an amidobetaine type surfactant.   The liquid skin cleansing agent according to any one of claims 1 to 9, wherein the mass ratio (A) / (C) of the component (A) to the component (C) is 2-35.   The liquid skin cleansing agent according to any one of claims 1 to 10, wherein the mass ratio (A) / (C) of the component (A) to the component (C) is 6 to 12.   The liquid skin cleansing agent according to claim 1, further comprising an ester compound.   The liquid skin cleansing agent according to claim 12, wherein the ester compound is glycol difatty acid ester. The method for producing a liquid skin cleansing agent according to any one of claims 1 to 13, which comprises the following steps.
(Step 1) A fatty acid which is an unneutralized product of the component (A) and a part or all of the neutralizing agent, the component (D) and the component (F) are adjusted so that the neutralization rate is 95 to 100%. Mixing to obtain a fatty acid salt-containing composition,
(Step 2) A step of mixing the fatty acid salt-containing composition obtained in Step 1 with the components (B), (C) and (E).