CN110719769A

CN110719769A - Liquid skin cleanser

Info

Publication number: CN110719769A
Application number: CN201880036433.9A
Authority: CN
Inventors: 尾崎慎吾; 舛井乔; 松田涉
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2017-06-02
Filing date: 2018-05-29
Publication date: 2020-01-21
Also published as: JP2018203657A; TWI786123B; TW201902456A; JP6721539B2; WO2018221529A1

Abstract

The present invention relates to a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F): (A) fatty acid salts: 5 to 18 mass%; (B) an anionic surfactant other than the component (A): 2.2-7 mass%; (C) amphoteric surfactant: 0.2 to 4 mass%; (D) carbonate salt: 0.2 to 7 mass%; (E) polyol: 0.1 to 10 mass%; (F) and water, wherein the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3-10.

Description

Liquid skin cleanser

Technical Field

The present invention relates to liquid skin cleansers.

Background

Liquid skin cleansing agents have been widely used in recent years because they have better dissolution and disintegration properties than solid soaps, have excellent foaming properties, and can easily cleanse the skin (for example, patent document 1).

However, liquid skin cleansers are known to have problems of squeezing out an excessive amount from the container, or using an excessive amount, and consumers are also demanding higher cleansing. Therefore, the present applicant has developed a liquid skin cleansing agent which can be easily taken out from a container in an appropriate amount, is easily dissolved and dispersed, has excellent cleansing power, and can provide a refreshing feeling by using a fatty acid salt, another anionic surfactant, and an amphoteric surfactant, and using a water-soluble polymer and a carbonate in combination at a specific ratio (patent document 2).

(patent document 1) Japanese patent document No. 2009-529588

(patent document 2) International publication No. 2013/204092

Disclosure of Invention

The present invention relates to a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F):

(A) fatty acid salts: 5 to 18 mass%,

(B) An anionic surfactant other than the component (A): 2.2 to 7 mass%,

(C) Amphoteric surfactant: 0.2 to 4 mass%,

(D) Carbonate salt: 0.2 to 7 mass%,

(E) Polyol: 0.1 to 10 mass%,

(F) The amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3-10.

Detailed Description

In the conventional skin cleansing agent, when a large amount of an anionic surfactant other than a fatty acid salt is added from the viewpoint of improving the smooth feeling of the skin after completion of washing, the following problems are found: that is, the tendency to increase in viscosity when water is added leads to a significant decrease in the compatibility with water during rinsing, and the residue of rinsing tends to cause a sticky feeling, which takes a long time for rinsing.

Thus, the present inventors have found that: by using a fatty acid salt, another anionic surfactant, an amphoteric surfactant, and a carbonate salt in combination with a polyhydric alcohol at a specific ratio, the smoothness of the skin after completion of washing can be improved, and the fusibility between the preparation and water can be improved, thereby obtaining a liquid skin cleanser which solves the above-mentioned technical problems.

The liquid skin cleansing agent of the present invention is characterized in that thickening is suppressed even when water is added, and the liquid skin cleansing agent has good compatibility with water, so that rinsing can be completed quickly without leaving rinsing residues and without causing a sticky feeling. In addition, the lathering ability and cleansing power were good, and the skin was smooth after washing.

As the fatty acid salt as the component (A), a compound represented by the general formula (1),

R¹-COOX (1)

in the formula, R¹Represents a linear or branched alkyl or alkenyl group having 9 to 21 carbon atoms; x represents an alkali metal, ammonium derived from an alkanolamine or a basic amino acid.

More specifically, for example: lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, arachidic acid, behenic acid, and the like. Among these, from the viewpoint of improving cleansing power and foaming properties, at least 1 kind of salt selected from lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid is preferably contained, and at least 1 kind of salt selected from lauric acid, myristic acid, and palmitic acid is more preferably contained.

Examples of such salts include: alkali metals such as sodium and potassium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine, triethanolamine and the like; and basic amino acids such as arginine and lysine. Among these, from the viewpoint of satisfying both of good fusibility with water and detergency, at least 1 species selected from sodium, potassium, ammonium, and arginine is preferably contained, more preferably at least 1 species selected from potassium and arginine is contained, and still more preferably at least potassium is contained.

For the component (a) fatty acid salt, for example, a fatty acid salt is formed by mixing an unneutralized fatty acid and a neutralizing agent in the composition and is allowed to exist in the composition.

The neutralizing agent is a compound which is basic, and examples thereof include: sodium hydroxide, potassium hydroxide, triethanolamine, basic amino acids, and the like. Among these, from the viewpoint of improving cleaning power and improving good fusibility with water, at least one selected from potassium hydroxide and sodium hydroxide is preferably contained, and at least potassium hydroxide is more preferably contained.

As the component (a), fatty acid salts may be used in combination of 1 or 2 or more. From the viewpoint of suppressing the increase in viscosity upon addition of water, improving foamability, good fusibility with water, and smooth skin feel, the content of the fatty acid salt of the component (a) in the liquid skin cleansing agent is 5 mass% or more, preferably 6.5 mass% or more, more preferably 8 mass% or more, and still more preferably 10 mass% or more, and is 18 mass% or less, preferably 16 mass% or less, more preferably 15 mass% or less, and still more preferably 12 mass% or less, in terms of fatty acid. In the liquid skin cleansing agent, the content of the component (a) is 5 to 18 mass%, preferably 6.5 to 16 mass%, more preferably 8 to 15 mass%, and still more preferably 10 to 12 mass% in terms of fatty acid.

The anionic surfactant of component (B) is an anionic surfactant other than component (a), and is not particularly limited as long as it is generally used in a skin cleanser, and examples thereof include: alkylbenzenesulfonates, alkanesulfonates, alkenylsulfonates, alkylsulfonates, acyl-2-isethionates, alkyl sulfate ester salts, alkyl ether sulfate ester salts, alkylsulfosuccinate salts, sulfo fatty acid methyl ester salts, fatty acid alkanolamide sulfate ester salts, monoacylglycerol sulfate ester salts, alkyl phosphate ester salts, polyoxyethylene alkyl ether phosphate salts, alkyl aryl ether phosphate salts, fatty acid amide ether phosphoric acid, ether carboxylic acid or a salt thereof, N-acylamino acid salts, and the like.

Among these, from the viewpoint of achieving good foamability, cleansing power, and smooth feeling on the skin, it is preferable to contain at least 1 selected from alkyl sulfate ester salts, alkyl ether sulfate ester salts, and ether carboxylic acids or salts thereof, more preferably at least 2, and still more preferably at least alkyl sulfate ester salts and/or alkyl ether sulfate ester salts, and ether carboxylate salts.

Examples of the alkyl sulfate salt that can be used as the component (B) include alkyl sulfate salts represented by the following general formula (2):

R²OSO₃M²(2)

in the formula (2), R²Represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms; m²Represents a cation selected from the group consisting of alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium and glucammonium.

In the general formula (2), with respect to R²From the viewpoint of achieving good foamability and cleaning power, an aliphatic hydrocarbon group having 8 to 18 carbon atoms is preferred, an aliphatic hydrocarbon group having 8 to 16 carbon atoms is more preferred, and an aliphatic hydrocarbon group having 10 to 16 carbon atoms is even more preferred. Further, the alkyl or alkenyl group has preferably 8 to 16 carbon atoms, more preferably 10 to 16 carbon atoms, and still more preferably 10 to 14 carbon atoms.

About M²From the same viewpoint as above, the alkali is preferredThe metal and ammonium are more preferably alkali metals, and still more preferably sodium salts.

Specific examples of the alkyl sulfate salt include: sodium lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, sodium myristyl sulfate, sodium cetyl sulfate, sodium stearyl sulfate, sodium oleyl sulfate, triethanolamine oleyl sulfate, and the like. Among these, 1 or more selected from sodium lauryl sulfate, triethanolamine lauryl sulfate, and ammonium lauryl sulfate are preferably contained. These compounds may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

Further, examples of commercially available products of the alkyl sulfate salt include: EMAL 0S (manufactured by kao corporation, sodium lauryl sulfate), EMAL 10PT (manufactured by kao corporation, sodium lauryl sulfate), EMAL TD (manufactured by kao corporation, triethanolamine lauryl sulfate), EMAL AD-25R (manufactured by kao corporation, ammonium lauryl sulfate), and the like.

Examples of the alkyl ether sulfate salt that can be used as the component (B) include alkyl ether sulfate salts represented by the following general formula (3):

R³O(CH₂CH₂O)_nSO₃M³(3)

in the formula (3), R³Represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms; m³Represents a cation selected from the group consisting of alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium and glucammonium; n represents an average molar number of addition, and n is 0.5 to 20.

In the general formula (3), with respect to R³From the viewpoint of achieving good foamability and cleaning power, an aliphatic hydrocarbon group having 8 to 18 carbon atoms is preferred, an aliphatic hydrocarbon group having 8 to 16 carbon atoms is more preferred, and an aliphatic hydrocarbon group having 10 to 16 carbon atoms is even more preferred. The alkyl or alkenyl group preferably has 8 to 16 carbon atoms, more preferably 10 to 16 carbon atoms, and still more preferably 10 to 14 carbon atoms.

From the same viewpoint as above, n is preferably 0.5 or more, and is preferably 12 or less, more preferably 5 or less, further preferably 4 or less, and further preferably 2 or less. Specifically, n is preferably 0.5 to 12, more preferably 0.5 to 5, still more preferably 0.5 to 4, and still more preferably 0.5 to 2.

About M³From the same viewpoint as described above, alkali metal and ammonium are preferable, alkali metal is more preferable, and sodium salt is even more preferable.

Specific examples of the alkyl ether sulfate salt include: selected from 1 or more than 2 of polyoxyethylene (1) sodium lauryl ether sulfate, polyoxyethylene (1) ammonium lauryl ether sulfate, polyoxyethylene (1) sodium myristyl ether sulfate, polyoxyethylene (2) sodium lauryl ether sulfate and polyoxyethylene (2) sodium myristyl ether sulfate. Among these, it is preferable to contain 1 or more selected from the group consisting of sodium polyoxyethylene (1) lauryl ether sulfate, ammonium polyoxyethylene (1) lauryl ether sulfate, and sodium polyoxyethylene (2) lauryl ether sulfate. In the present specification, the parenthesized numerical values of these compounds represent the average molar number of addition of ethylene oxide.

Further, examples of commercially available products of the alkyl ether sulfate salt include: EMAL125HP (sodium polyoxyethylene (1) lauryl ether sulfate manufactured by kao corporation), EMAL 125A (ammonium polyoxyethylene (1) lauryl ether sulfate manufactured by kao corporation), EMAL 227 (sodium polyoxyethylene (2) lauryl ether sulfate manufactured by kao corporation), and the like.

Examples of the ether carboxylic acid or a salt thereof which can be used as the component (B) include an ether carboxylic acid represented by the following general formula (4):

R⁴O(CH₂CH₂O)_mCH₂COOM⁴(4)

in the formula (4), R⁴Represents an alkyl group or an alkenyl group having 10 to 22 carbon atoms; m represents an average addition mole number and is a number of 0.5 to 10; m⁴Represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic ammonium.

In the general formula (4), with respect to R⁴From the viewpoint of achieving good foamability and cleaning power, an alkyl group having 12 to 16 carbon atoms is preferable, and an alkyl group having 12 to 14 carbon atoms is more preferable.

From the same viewpoint as above, the average molar number m of ethylene oxide added is preferably 2 to 5.

About M⁴Examples thereof include: a hydrogen atom; alkali metals such as sodium and potassium; alkaline earth metals such as calcium and magnesium; ammonium; ammonium derived from alkanolamines such as monoethanolamine, diethanolamine, triethanolamine and the like; ammonium derived from basic amino acids such as arginine and lysine. Among these, from the same viewpoint as described above, 1 or 2 or more selected from sodium, potassium, triethanolamine and arginine are preferable, and 1 or 2 selected from sodium and potassium are more preferable.

From the same viewpoint as described above, the ether carboxylic acid or a salt thereof specifically preferably contains 1 or 2 or more selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and polyoxyethylene palmityl ether carboxylic acid or a salt thereof, more preferably contains 1 or 2 selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, and still more preferably contains polyoxyethylene lauryl ether carboxylic acid or a salt thereof.

Further, examples of commercially available products of the ether carboxylic acid or a salt thereof include: AKYPO RLM45CA (manufactured by Kao corporation), AKYPO LM 26C (manufactured by Kao corporation), and the like.

The component (B) may be used alone in 1 kind or in combination of 2 or more kinds. The content of the component (B) in the liquid skin cleansing agent is preferably 2.2% by mass or more, more preferably 2.5% by mass or more, further preferably 3.2% by mass or more, further preferably 3.8% by mass or more, and further preferably 7% by mass or less, further preferably 6.6% by mass or less, further preferably 6.2% by mass or less, and further preferably 4.8% by mass or less, from the viewpoint of improving foaming, cleansing power, and smooth feeling of the skin. The content of the component (B) in the liquid skin cleansing agent is preferably 2.2 to 7% by mass, more preferably 2.5 to 6.6% by mass, even more preferably 3.2 to 6.2% by mass, and even more preferably 3.8 to 4.8% by mass.

The amphoteric surfactant as the component (C) is not particularly limited as long as it is a component generally used in skin cleansers, and examples thereof include: betaine acetate surfactants such as lauryl dimethyl glycine betaine and stearyl dimethyl glycine betaine; amine oxide type surfactants such as lauryl dimethyl amine oxide; imidazolium betaine surfactants such as 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolium betaine; amide betaine surfactants such as lauric acid amide propyl betaine and coconut oil fatty acid amide propyl betaine; and sulfobetaine surfactants such as lauryl hydroxysulfobetaine.

Among these, from the viewpoint of improving foamability and suppressing the appearance of sticky feeling during rinsing, at least 1 selected from the group consisting of an acetate betaine type surfactant, a sulfobetaine type surfactant and an amide betaine type surfactant is preferably contained, more preferably at least 1 selected from the group consisting of a sulfobetaine type surfactant and an amide betaine type surfactant is contained, and still more preferably at least a sulfobetaine type surfactant is contained. More specifically, the composition preferably contains at least 1 selected from the group consisting of lauryl dimethylamino acetate betaine, stearyl dimethylamino acetate betaine, lauryl hydroxysultaine, and lauramidopropylbetaine, more preferably contains at least 1 selected from the group consisting of lauryl hydroxysultaine and lauramidopropylbetaine, and still more preferably contains at least lauryl hydroxysultaine.

The component (C) may be used alone in 1 kind or in combination of 2 or more kinds. From the viewpoints of suppressing the increase in viscosity when water is added, achieving good fusibility with water, improving foaming properties, and suppressing the appearance of a sticky feeling during rinsing, the content of the component (C) in the liquid skin cleansing agent is 0.2% by mass or more, preferably 0.4% by mass or more, more preferably 1.0% by mass or more, and further preferably 1.4% by mass or more, and is 4.0% by mass or less, preferably 2.5% by mass or less, more preferably 1.9% by mass or less, and further preferably 1.6% by mass or less. The content of the component (C) in the liquid skin cleansing agent is 0.2 to 4.0% by mass, preferably 0.4 to 2.5% by mass, more preferably 1.0 to 1.9% by mass, and still more preferably 1.4 to 1.6% by mass.

In the present invention, from the viewpoint of achieving good fusibility with water, achieving good foamability, and suppressing the appearance of sticky feeling during rinsing, the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3 or more, preferably 1.7 or more, more preferably 2.2 or more, further preferably 2.8 or more, and further 10 or less, preferably 6 or less, more preferably 4.3 or less, further preferably 3.3 or less. The mass ratio (B)/(C) of the component (B) to the component (C) is 5/3 to 10, preferably 1.7 to 6, more preferably 2.2 to 4.3, and still more preferably 2.8 to 3.3.

As the carbonate as the component (D), for example: alkali metal salts such as sodium carbonate, potassium carbonate, sodium hydrogen carbonate and potassium hydrogen carbonate; alkali metal salts such as calcium carbonate, magnesium carbonate and magnesium hydrogen carbonate; ammonium salts such as ammonium carbonate and ammonium bicarbonate, and the like.

Among these, from the viewpoint of making the liquid skin cleansing agent water-soluble in nature and from the viewpoint of satisfying both the appropriate ease of taking out the composition and the foaming and cleansing properties, at least 1 selected from the group consisting of sodium carbonate, potassium carbonate, sodium hydrogencarbonate and potassium hydrogencarbonate is preferable, at least 1 selected from the group consisting of sodium carbonate and potassium carbonate is more preferable, and at least 1 selected from the group consisting of sodium hydrogencarbonate and potassium hydrogencarbonate is further preferable, and sodium carbonate and sodium hydrogencarbonate are further more preferable.

The component (D) may be used alone in 1 kind or in combination of 2 or more kinds. From the viewpoint of achieving good fusibility with water, improving the smooth feel of the skin, and suppressing a decrease in viscosity of the liquid skin cleanser, the content of the component (D) in the liquid skin cleanser is 0.2% by mass or more, preferably 0.4% by mass or more, more preferably 1% by mass or more, and further preferably 1.8% by mass or more, and is 7% by mass or less, preferably 5% by mass or less, more preferably 3.5% by mass or less, and further preferably 2.5% by mass or less. In the liquid skin cleansing agent, the content of the component (D) is 0.2 to 7% by mass, preferably 0.4 to 5% by mass, more preferably 1 to 3.5% by mass, and still more preferably 1.8 to 2.5% by mass.

The polyhydric alcohol as the component (E) may be any one that is generally used in skin cleanser compositions, and examples thereof include: polyhydric alcohols (trihydric or higher polyhydric alcohols) having 3 or more hydroxyl groups such as glycerin, diglycerin, sorbitol, mannitol, erythritol, xylitol, maltitol, trehalose, and sucrose; polyhydric alcohols (dihydric polyols) having 2 hydroxyl groups such as ethylene glycol, propylene glycol, 1, 3-propanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol, isoprene glycol, polyethylene glycol (average molecular weight of 2000 or less), and polypropylene glycol (average molecular weight of 1500 or less).

Among these, from the viewpoint of achieving good fusibility with water and foamability, the ternary or higher polyhydric alcohol preferably contains 1 or 2 or more selected from glycerol, diglycerol, sorbitol, and maltitol, more preferably contains 1 or 2 selected from glycerol and diglycerol, and still more preferably contains glycerol. The dihydric polyol preferably contains 1 or 2 or more selected from ethylene glycol, propylene glycol, 1, 3-propanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol, and isoprene glycol, more preferably contains 1 or 2 or more selected from propylene glycol, 1, 3-propanediol, 1, 3-butanediol, diethylene glycol, and dipropylene glycol, and still more preferably contains 1 or 2 or more selected from propylene glycol, dipropylene glycol, and 1, 3-butanediol.

The component (E) is preferably a dihydric polyol, particularly from the viewpoints of suppressing the increase in viscosity of the liquid skin cleanser upon addition of water and achieving good fusibility with water. When the component (E) contains a trihydric or higher polyol, the polyol preferably contains at least a dihydric polyol together, more preferably 5% by mass or higher dihydric polyol, and still more preferably 10% by mass or higher dihydric polyol.

The component (E) may be used alone in 1 kind or in combination of 2 or more kinds. From the viewpoint of suppressing the increase in viscosity of the liquid skin cleanser upon addition of water and achieving good fusibility to water and foamability, the content of the component (E) in the liquid skin cleanser is 0.1 mass% or more, preferably 0.4 mass% or more, more preferably 0.7 mass% or more, and even more preferably 0.9 mass% or more, and further 10 mass% or less, preferably 7.5 mass% or less, more preferably 3 mass% or less, and even more preferably 1.8 mass% or less. In the liquid skin cleansing agent, the content of the component (E) is 0.1 to 10 mass%, preferably 0.4 to 7.5 mass%, more preferably 0.7 to 3 mass%, and still more preferably 0.9 to 1.8 mass%.

In the present invention, the mass ratio (B)/(E) of the component (B) to the component (E) is preferably 0.5 or more, more preferably 0.6 or more, even more preferably 2.5 or more, and further preferably 10 or less, more preferably 6 or less, even more preferably 5 or less, from the viewpoints of suppressing thickening upon addition of water and achieving good fusibility with water and foaming properties. The mass ratio (B)/(E) of the component (B) to the component (E) is preferably 0.5 to 10, more preferably 0.6 to 6, and still more preferably 2.5 to 5.

The component (F) water is used as a solvent, and the content of the component (F) in the liquid skin cleansing agent is preferably 40% by mass or more, more preferably 50% by mass or more, and still more preferably 54% by mass or more, and further preferably 90% by mass or less, more preferably 85% by mass or less, and still more preferably 80% by mass or less. In the liquid skin cleansing agent, the content of the component (F) is preferably 40 to 90% by mass, more preferably 50 to 85% by mass, and still more preferably 54 to 80% by mass.

In the present invention, since the carbonate (D) is contained in the composition, if an acid is present in the composition, the carbonate (D) reacts with the acid to generate a carbonic acid gas, and therefore, it is impossible to achieve an appropriate viscosity, and it is difficult to achieve both appropriate ease of taking out and dissolution collapsibility. Therefore, it is preferable to neutralize not only the component (A) but also other components (for example, the component (G) described later) in advance if they are acidic components.

From the viewpoint of improving both the adequate ease of taking out and the dissolution collapsibility, the neutralization ratio with respect to the total of the component (a) and the other acidic component is preferably 0.90 to 1.10, and more preferably 0.95 to 1.05.

The liquid skin cleansing agent of the present invention can further contain (G) a water-soluble polymer, and thus can achieve good foaming properties and a smooth feel on the skin.

The water-soluble polymer may be any one that is generally used in a skin cleanser.

Examples of the water-soluble polymer include: acrylic acid-alkyl (meth) acrylate copolymers, hydroxyethyl or hydroxypropyl added cellulose, high-polymerized polyalkylene glycols, cationic polymers, and the like.

Examples of the acrylic acid-alkyl (meth) acrylate copolymer include: acrylic acid/alkyl acrylate crosslinked polymers, etc., for example: PEMULEN TR-1, PEMULEN TR-2, CARBOPOL ETD2020, CARBOPOL 1382 and CARBOPOL 1342 (both of which are made by Lubrizol Advanced Materials Co., Ltd.); and AQUPEC HV-501ER (manufactured by Sumitomo Seiki Ltd.).

The cellulose to which hydroxyethyl groups or hydroxypropyl groups are added is a product in which a part of hydrogen atoms of hydroxyl groups of the cellulose is substituted by hydroxyethyl groups or hydroxypropyl groups, and may have a substituent other than these.

Specifically, for example: hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, and the like.

These are obtained by: that is, the cellulose is reacted with caustic soda to form alkali cellulose, and then, for example, methane chloride, monochloroacetic acid, ethylene oxide, propylene oxide, or the like is further reacted to substitute a hydrogen atom on a hydroxyl group of the cellulose with a hydroxyethyl group, a hydroxypropyl group, a methyl group, a carboxymethyl group, or the like.

From the viewpoint of improving foamability and foam sustainability, the average degree of substitution of these celluloses is more than 0, more preferably 0.5 or more, and further preferably 3 or less, more preferably 2 or less. The weight average molecular weight is preferably 200,000 or more, more preferably 500,000 or more, and even more preferably 650,000 or more, and is preferably 3,000,000 or less, more preferably 2,000,000 or less, and even more preferably 1,600,000 or less, from the viewpoint of improving solubility in the liquid detergent composition, foamability, and foam sustainability.

In the present invention, the average substitution degree is determined by NMR, and the weight average molecular weight is measured by a Gel Permeation Chromatograph (GPC) -multi-angle laser light scattering detector (MALLS) system using polyethylene oxide as a standard substance.

The cellulose to which hydroxyethyl groups or hydroxypropyl groups are added is preferably hydroxyethyl cellulose or hydroxypropyl methylcellulose, and the cellulose is preferably a component having an average degree of substitution of 0.5 to 2 and a weight-average molecular weight of 650,000 to 1,600,000.

As the cellulose to which a hydroxyethyl group or a hydroxypropyl group is added, for example, as hydroxyethyl cellulose, for example: CELLOSIZE QP52000H (manufactured by Tao chemical Co., Ltd.), HEC Daicel SE400, SE500, SE600, SE850, SE900 (both manufactured by Daicel Finechem Co., Ltd.), etc.; as the hydroxypropylmethylcellulose, for example: commercially available products such as METOLOSE60SH, 65SH (both manufactured by shin-Etsu chemical industries, Ltd.), BENECEL E50, E4M, E10M, F4MC, K99C, K4M, K15M, K35M, K100M and K200M (both manufactured by ASHLAND).

The highly polymerizable alkylene glycol in the present invention is a polyalkylene glycol having a weight average molecular weight of 2 ten thousand or more, and from the viewpoint of achieving good foamability and foam quantity, the weight average molecular weight is preferably 40 ten thousand or more, more preferably 100 ten thousand or more, further preferably 150 ten thousand or more, and further preferably 500 ten thousand or less, more preferably 350 ten thousand or less, further preferably 250 ten thousand or less. The number of carbon atoms of the alkylene group of the high-polymerization polyalkylene glycol is preferably 2 to 6, more preferably 2 to 4, and specific alkylene groups are preferably ethylene group and propylene group, more preferably ethylene group, from the same viewpoint.

As the high-polymerizable alkylene glycol, specifically, for example: POLYOX WSR N-10 and POLYOX WSRN-60K (weight average molecular weight 200 ten thousand, manufactured by Dow chemical Co., Ltd.); ALKOX E-100 (weight average molecular weight 300 ten thousand, manufactured by Mingchi chemical industries, Ltd.); ALKOX E-30G (weight average molecular weight: 40 ten thousand, manufactured by Mingcheng chemical industries, Ltd.); and a commercially available product such as ALKOX E-240 (weight average molecular weight 500 ten thousand, manufactured by Mingchi chemical industries, Ltd.).

The cationic polymer is a polymer containing an amino group, an imidazole group, a pyridine group, a salt thereof, a quaternary ammonium salt thereof, or the like, and the cationic charge density thereof is preferably 2meq/g or more, more preferably 2 to 8meq/g, and still more preferably 3 to 7meq/g, from the viewpoint of achieving good fusibility to water, foamability, and smooth skin feel.

Here, the "cationic charge density" refers to the number of equivalents of cationic charge in the monomer units constituting the polymer (meq/g).

Examples of the cationic polymer include: a homopolymer of dimethyldiallylammonium chloride; copolymers of dimethyldiallylammonium chloride with other monomers such as (meth) acrylic acid, (meth) acrylic acid esters, (meth) acrylamides, and the like; and poly (methacryloyloxyethyltrimethyl ammonium chloride) chloride.

More specifically, for example: a homopolymer of dimethyldiallylammonium chloride (MERQUAT 100; manufactured by Nalco corporation: charge density 6.2meq/g), a copolymer of dimethyldiallylammonium chloride and acrylic acid (MERQUAT 295; manufactured by Nalco corporation: charge density 5.9meq/g), a copolymer of dimethyldiallylammonium chloride and acrylic acid (MERQUAT 280; manufactured by Nalco corporation: charge density 5.0meq/g), a copolymer of dimethyldiallylammonium chloride and acrylamide (MERQUAT550, manufactured by Nalco corporation: electric charge density 3.2meq/g), poly (methacryloyloxyethyltrimethyl ammonium chloride) (manufactured by Huawang corporation: electric charge density 4.8meq/g), a copolymer of methylvinylimidazolium chloride and vinylpyrrolidone (LUVIQUAT excellence, manufactured by BASF corporation: charge density 6.1meq/g, and LUVIQUAT FC550, manufactured by BASF corporation: charge density 4.4meq/g), and the like.

The cationic polymer is preferably a homopolymer of dimethyldiallylammonium chloride, a copolymer of dimethyldiallylammonium chloride and acrylic acid, or a copolymer of dimethyldiallylammonium chloride and acrylamide, from the viewpoint of achieving good fusibility with water, foamability, and smooth skin feel.

The water-soluble polymer as the component (G) preferably contains at least a cationic polymer, more preferably contains 1 or 2 or more species selected from the group consisting of a copolymer of a cationic polymer and an alkyl acrylate- (meth) acrylate, a cellulose to which a hydroxyethyl group or a hydroxypropyl group is added, and a highly polymerized polyalkylene glycol, and even more preferably contains a cationic polymer, a cellulose to which a hydroxyethyl group or a hydroxypropyl group is added, and a highly polymerized polyalkylene glycol, from the viewpoint of achieving good fusibility to water, foamability, and smooth feeling of the skin.

More specifically, it is preferable to contain 1 or 2 or more selected from the group consisting of a homopolymer of dimethyldiallylammonium chloride, a copolymer of dimethyldiallylammonium chloride and acrylic acid, a copolymer of dimethyldiallylammonium chloride and acrylamide, a copolymer of poly (methacryloyloxyethyltrimethyl ammonium chloride) and a copolymer of methyl vinyl imidazolium chloride and vinyl pyrrolidone; more preferably contains: 1 or more than 2 selected from homopolymer of dimethyl diallyl ammonium chloride, copolymer of dimethyl diallyl ammonium chloride and acrylic acid, copolymer of dimethyl diallyl ammonium chloride and acrylamide, copolymer of poly (chlorinated methacryloyloxyethyl trimethyl ammonium chloride) and methyl vinyl imidazolium chloride and vinyl pyrrolidone, and 1 or more than 2 selected from acrylic acid/alkyl acrylate cross-linked polymer, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, high-polymer polyethylene glycol and high-polymer polypropylene glycol; more preferably, the composition comprises: selected from 1 or more than 2 of homopolymer of dimethyl diallyl ammonium chloride, copolymer of dimethyl diallyl ammonium chloride and acrylic acid, copolymer of dimethyl diallyl ammonium chloride and acrylamide, poly (chlorinated methacryloyloxyethyl trimethyl ammonium chloride) and copolymer of methyl vinyl imidazolium chloride and vinyl pyrrolidone, hydroxyethyl cellulose or hydroxypropyl methyl cellulose, and high-polymerized polyethylene glycol or high-polymerized polypropylene glycol.

The content of the component (G) in the liquid skin cleansing agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, and further preferably 1.5% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.3% by mass or less, from the viewpoint of achieving good fusibility with water, foamability, and smooth skin feel. In the liquid skin cleansing agent, the content of the component (G) is preferably 0.01 to 1.5% by mass, more preferably 0.05 to 0.8% by mass, and still more preferably 0.1 to 0.3% by mass.

The liquid skin cleanser of the present invention may further contain (H) a nonionic surfactant, and thus, foaming properties and cleansing power can be improved.

Examples of the nonionic surfactant include: polyglycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene polyoxypropylene glycol, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkyl ether fatty acid esters, sucrose fatty acid esters, alkylpolyglucosides, (poly) alkyl glyceryl ethers, alkyl alkanolamides, and the like.

Among these, the HLB of the nonionic surfactant is preferably 8 or more, more preferably 9 or more, and even more preferably 9.5 or more, and further preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less, from the viewpoint of achieving good foamability and soft feel of the skin. The HLB of the component (H) is preferably 8 to 18, more preferably 9 to 16, and still more preferably 9.5 to 14.

In the present invention, HLB (Hydrophile-lipophilc Balance) is calculated by (sigma inorganic value/. sigma organic value). times.10. Here, regarding the respective values of "inorganic value" and "organic value", for example, the respective "inorganic value" and "organic value" are set for each atom or functional group so that the "organic value" of 1 carbon atom in the molecule is 20 and the "inorganic value" of 1 hydroxyl group is 100, and the IOB value of the organic compound is calculated by accumulating the "inorganic value" and "organic value" of all the atoms and functional groups in the organic compound (for example, refer to Kada Ming-Kagaku, "New version organic conceptual diagram-base and application-" pages 3 to 17, 95 to 102, three publications, published in 1984). The HLB of a mixed surfactant containing 2 or more surfactants is obtained by weighted-averaging the HLB of each surfactant according to the mixing ratio.

The nonionic surfactant as the component (H) preferably contains 1 or 2 or more selected from polyglycerin fatty acid esters, polyethyleneglycol fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene alkyl ethers, alkylpolyglucosides, and alkylalkanolamides, more preferably contains 1 or 2 or more selected from polyethyleneglycol fatty acid esters, polyoxyethylene alkyl ethers, alkylpolyglucosides, and alkylalkanolamides, and still more preferably contains an alkylalkanolamide, from the viewpoint of achieving a good foam quality and a good cleansing power.

Examples of the alkyl alkanolamide which can be used as the component (H) include alkyl alkanolamides represented by the following general formula (5):

in the formula, R⁵CO represents an acyl group having 8 to 20 carbon atoms; r⁶Represents a hydrogen atom, a methyl group or a hydroxyethyl group.

In the general formula (5), R⁵The CO is preferably an acyl group having 8 to 20 carbon atoms, more preferably an acyl group having 10 to 18 carbon atoms. In addition, R⁶Preferably a hydrogen atom or a methyl group.

As commercially available products of polyethylene glycol fatty acid esters, there can be exemplified: polyethylene glycol monolaurate (12EO) (EMANON112(HLB13.7), manufactured by Kao corporation), and the like.

As commercially available products of polyoxyethylene alkyl ethers, there can be exemplified: polyoxyethylene (21) lauryl ether (EMULGEN 121-G (HLB15.0), manufactured by queen), polyoxyethylene (9) lauryl ether (EMULGEN 109P (HLB12.0), manufactured by queen), polyoxyethylene (20) octyldodecyl ether (EMULGEN 2020G (HLB13.0), manufactured by queen), polyoxyethylene (25) octyldodecyl ether (EMULGEN 2025G (HLB15.6), manufactured by queen), and the like.

As commercially available products of alkylpolyglucosides, for example, preferred are: decyl glucoside (MYDOL 10(HLB14.0), manufactured by Kao corporation), lauryl glucoside (MYDOL 12(HLB14.6), manufactured by Kao corporation), and the like.

As commercially available products of alkyl alkanolamides, there may be exemplified: COCAMIDE monoethanolamine (COCAMIDE MEA, amine C01-S (HLB10.7), manufactured by kao corporation), LAURAMIDE diethanolamine (LAURAMIDE DEA, amine L-02(HLB12.5), manufactured by kao corporation), and the like.

From the viewpoint of improving foaming properties and cleansing power, the content of the component (H) in the liquid skin cleansing agent is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more, and is preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less. In the liquid skin cleansing agent, the content of the component (H) is preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass, and still more preferably 0.5 to 1% by mass.

The liquid skin cleansing agent of the present invention may further contain (I) a pearling agent, whereby a good glossy feeling of the agent and a good fusibility to water can be achieved.

Specifically, the pearling agent is preferably a glycol di-fatty acid ester, more preferably at least 1 selected from the group consisting of ethylene glycol dioleate, ethylene glycol dilaurate, ethylene glycol distearate, propylene glycol dilaurate, and propylene glycol distearate, and still more preferably at least 1 selected from the group consisting of ethylene glycol dioleate, ethylene glycol dilaurate, and ethylene glycol distearate.

From the viewpoint of achieving a good glossy feel of the preparation and fusibility to water, the content of the component (I) in the liquid skin cleansing agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.4% by mass or more, and further preferably 4% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less. In the liquid skin cleansing agent, the content of the component (I) is preferably 0.01 to 4% by mass, more preferably 0.1 to 3% by mass, and still more preferably 0.4 to 2% by mass.

The liquid skin cleanser of the present invention may further contain ingredients commonly used in cleansers, such as: surfactants other than the components (A), (B), (C) and (H), moisturizers other than the component (E), oily components, antiseptics, anti-inflammatory agents, antiseptics, chelating agents, thickeners, salts, polishing agents, perfumes, cooling agents, pigments, ultraviolet absorbers, antioxidants, plant extracts, and the like.

The liquid skin cleansing agent of the present invention may contain an oily component from the viewpoint of improving the rinsing property. From the viewpoint of achieving good foamability and cleansing power, the content of the oily component in the liquid skin cleansing agent is preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less. Here, the "oily component" refers to a hydrophobic substance that is phase-separated from water, and includes, for example: oils and fats, hydrocarbon oils, ester oils, higher alcohols (having 10 or more carbon atoms), silicone oils, and the like.

The liquid skin cleansing agent of the present invention may further contain a cationic surfactant from the viewpoint of achieving a good smooth feeling on the skin. The content of the cationic surfactant is preferably 5% by mass or less, more preferably 3% by mass or less, further preferably 1% by mass or less, and further preferably 0.5% by mass or less in the liquid skin cleansing agent, from the viewpoints of achieving a good smooth feeling of the skin and suppressing the appearance of a sticky feeling during rinsing.

The liquid skin cleanser of the present invention is produced by mixing the ingredients to be blended by a usual method.

For example, the production can be performed by a method including the following steps 1, 2, 3, and 4.

(step 1) heating the component (F) to 60 to 80 ℃ in advance;

(step 2) mixing the non-neutralized product of the component (A) with a neutralizing agent (potassium hydroxide or the like) in the water heated in the step 1 so that the neutralization rate is 95 to 105% to obtain a fatty acid salt-containing composition;

(step 3) a step of adding the fatty acid salt-containing composition obtained in step 2, and the component (B), the component (C), the component (D), and the component (E), and if necessary, the component (G), the component (H), the component (I), and other components in this order, and mixing them;

(step 4) a step of cooling the mixture obtained in step 3 to 20 to 35 ℃.

Among them, when other acidic components than the unneutralized component (a) are present as the other components to be used, since there is a possibility that the component (D) reacts with the acidic components to generate carbonic acid gas, it is preferable that the unneutralized component (a) and other acidic components are mixed in the step 2, and then the neutralizing agent is added to neutralize the unneutralized component (a) and other acidic components to a predetermined neutralization rate, and then the process is transferred to the step 3.

For example, when a part of the component (B) is an acidic component, it can be produced by a method including the following steps 1', 2', 3', and 4'.

(step 1') heating the component (F) to 60 to 80 ℃ in advance;

(step 2) mixing the unneutralized product of the component (A), the unneutralized product of the component (B), other acidic components (such as EDTA) added as needed, and a neutralizing agent (such as potassium hydroxide) in the water heated in the step 1' so that the neutralization rate is 95-105%, thereby obtaining a fatty acid salt-containing composition;

(step 3') a step of adding and mixing the fatty acid salt-containing composition obtained in step 2', the remainder of component (B), component (C), component (D), and component (E), and optionally, component (G), component (H), component (I), and other components other than the acidic component, in this order;

(step 4') A step of cooling the mixture obtained in step 3' to 20 to 35 ℃.

As the container for containing the liquid skin cleansing agent of the present invention, various containers such as a bottle, a tube, a pump, and a bag can be selected depending on the viscosity and the volume. As the material, plastic, glass, metal, or a composite thereof can be used as desired. From the viewpoint of the ease of taking out the liquid skin cleansing agent to a suitable degree and the excellent economy, the liquid skin cleansing agent is preferably a bag container or a bottle container, and more preferably a bottle container.

By "bag container" is meant, for example: a flat bag container produced by sealing (heat sealing) the left and right edges and the bottom edge between films of a resin bag body formed by appropriately laminating an outer resin film layer having excellent printability and barrier properties against contents and an inner resin film layer having excellent sealability (heat sealability, etc.); or a self-standing bag-shaped container (so-called "self-standing bag") which is made by sandwiching another resin film between the resin films and sealing the peripheral edge portion.

The bottle container is not particularly limited and can be used. The material of the bottle container may be, for example: resin containers of polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyvinyl chloride, ethylene-vinyl alcohol resin, acrylonitrile-styrene resin, ABS resin, polyamide, and the like; and a glass container. Further, the structure of the bottle container is preferably a single-layer structure or a layer structure of 2 or more layers.

The liquid skin cleanser of the present invention has a characteristic that rinsing can be rapidly completed because the skin after washing is excellent in smoothness, has good fusibility with water during foaming, and is less likely to have undissolved residue. If the undissolved residue is too large, the liquid skin cleansing agent remains on the skin in a high concentration state and is not easily washed off. In order to improve the smoothness of the skin after completion of washing with a liquid skin cleanser, it is possible to reduce the roughness caused by fatty acid salts by adding a large amount of an anionic surfactant other than fatty acid salts. However, the following phenomenon occurs: that is, when the preparation is taken out and foamed, the viscosity of the liquid skin cleanser is significantly increased due to the addition of water. Therefore, the following problems occur: that is, undissolved residue of the preparation is produced, and rinsing residue is likely to occur during rinsing, resulting in sticky feeling and time-consuming rinsing. However, the present invention, with the above composition, can achieve excellent effects of improving the softness of the skin after completion of washing while maintaining good foamability and cleansing power, suppressing thickening even when water is added, having good compatibility with water, causing no residual rinse residue during rinsing, causing no sticky feeling, and completing rinsing quickly.

The liquid skin cleansing agent of the present invention is in a form at 30 ℃, and from the viewpoint of improving ease of removal from a container, the viscosity at 30 ℃ is preferably 1000 to 8500 mPas, more preferably 1100 to 8000 mPas, and still more preferably 1200 to 6500 mPas.

In the present invention, the viscosity was measured at 30 ℃ using a type B VISCOMETER/VISCOMETER TVB-10M (TOKI SANGYO CO., LTD).

The liquid skin cleanser of the present invention is preferably, for example: a face cleansing agent, a bathing agent, a hand washing agent, etc., more preferably a bathing agent.

For the liquid skin cleanser of the present invention, it can be used in the following manner: that is, the composition is applied to, for example, the skin, more specifically, any part such as the scalp, face, body, hands and feet, and then rinsed with water for use.

The present invention further discloses the following compositions in relation to the above embodiments.

< 1 > a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F):

(A) fatty acid salts: 5 to 18 mass%;

(B) an anionic surfactant other than the component (A): 2.2-7 mass%;

(C) amphoteric surfactant: 0.2 to 4 mass%;

(D) carbonate salt: 0.2 to 7 mass%;

(E) polyol: 0.1 to 10 mass%;

(F) the amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3-10.

< 2 > the liquid skin cleansing agent according to the above < 1 >, wherein the fatty acid salt of the component (A) is preferably a compound represented by the general formula (1):

R¹-COOX (1)

in the formula, R¹Represents a linear or branched alkyl or alkenyl group having 9 to 21 carbon atoms; x represents an alkali metal, ammonium derived from an alkanolamine or a basic amino acid,

more preferably, the composition contains at least 1 kind of salt selected from lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid, and more preferably contains at least 1 kind of salt selected from lauric acid, myristic acid, and palmitic acid.

< 3 > the liquid skin cleansing agent according to the above < 1 > or < 2 >, wherein the content of the component (a) is preferably 6.5% by mass or more, more preferably 8% by mass or more, further preferably 10% by mass or more, and further preferably 16% by mass or less, more preferably 15% by mass or less, further preferably 12% by mass or less in the liquid skin cleansing agent in terms of fatty acid.

< 4 > the liquid skin cleansing agent according to any one of the above < 1 > to < 3 >, wherein the anionic surfactant as the component (B) preferably contains at least 1 selected from alkyl sulfate salts, alkyl ether sulfate salts, and ether carboxylic acids or salts thereof, more preferably contains at least 2, and still more preferably contains at least an alkyl sulfate salt and/or an alkyl ether sulfate salt, and an ether carboxylate salt.

< 5 > the liquid skin cleansing agent according to the above < 4 >, wherein the alkyl sulfate salt is preferably a compound represented by the following general formula (2) among the anionic surfactants as the component (B):

R²OSO₃M²(2).

in the formula (2), R²Represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms; m²Represents a cation selected from the group consisting of alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium and glucammonium,

more preferably, the composition contains 1 or more selected from sodium lauryl sulfate, triethanolamine lauryl sulfate and ammonium lauryl sulfate.

< 6 > the liquid skin cleansing agent according to the above < 4 >, wherein the alkyl ether sulfate salt is preferably a compound represented by the following general formula (3) among the anionic surfactants as the component (B):

R³O(CH₂CH₂O)_nSO₃M³(3)

in the formula (3), R³Represents an aliphatic hydrocarbon group having 8 to 22 carbon atoms; m³Represents a cation selected from the group consisting of alkali metals, alkaline earth metals, ammonium, alkylammonium, alkanolammonium and glucammonium; n represents an average addition mole number and is 0.5 to 20,

more preferably, the composition contains 1 or more selected from the group consisting of sodium polyoxyethylene (1) lauryl ether sulfate, ammonium polyoxyethylene (1) lauryl ether sulfate, and sodium polyoxyethylene (2) lauryl ether sulfate.

< 7 > the liquid skin cleansing agent according to the above < 4 >, wherein, in the anionic surfactant as the component (B), the ether carboxylic acid or a salt thereof is preferably a compound represented by the following general formula (4):

R⁴O(CH₂CH₂O)_mCH₂COOM⁴(4)

in the formula (4), R⁴Represents an alkyl group or an alkenyl group having 10 to 22 carbon atoms; m represents an average addition mole number, and m is a number of 0.5 to 10; m⁴Represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic ammonium,

more preferably, the composition contains 1 or 2 or more species selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and polyoxyethylene palmityl ether carboxylic acid or a salt thereof, still more preferably contains 1 or 2 species selected from polyoxyethylene lauryl ether carboxylic acid or a salt thereof, and polyoxyethylene myristyl ether carboxylic acid or a salt thereof, and still more preferably contains polyoxyethylene lauryl ether carboxylic acid or a salt thereof.

< 8 > the liquid skin cleansing agent according to any one of the above < 1 > to < 7 >, wherein the content of the component (B) in the liquid skin cleansing agent is preferably 2.5% by mass or more, more preferably 3.2% by mass or more, further preferably 3.8% by mass or more, and further preferably 6.6% by mass or less, more preferably 6.2% by mass or less, further preferably 4.8% by mass or less.

< 9 > the liquid skin cleansing agent according to any one of the above < 1 > to < 8 >, wherein the amphoteric surfactant as the component (C) preferably contains at least 1 selected from the group consisting of an acetate betaine type surfactant, a sulfobetaine type surfactant and an amide betaine type surfactant, more preferably contains at least 1 selected from the group consisting of a sulfobetaine type surfactant and an amide betaine type surfactant, and still more preferably contains at least a sulfobetaine type surfactant.

< 10 > the liquid skin cleansing agent according to any one of the above < 1 > to < 9 >, wherein the component (C) preferably contains at least 1 selected from the group consisting of lauryl dimethylaminoacetic acid betaine, stearyl dimethylaminoacetic acid betaine, lauryl hydroxysultaine, and lauramidopropyl betaine, more preferably contains at least 1 selected from the group consisting of lauryl hydroxysultaine and lauramidopropyl betaine, and still more preferably contains at least lauryl hydroxysultaine.

< 11 > the liquid skin cleansing agent according to any one of the above < 1 > to < 10 >, wherein the content of the component (C) in the liquid skin cleansing agent is preferably 0.4% by mass or more, more preferably 1.0% by mass or more, further preferably 1.4% by mass or more, and further preferably 2.5% by mass or less, more preferably 1.9% by mass or less, further preferably 1.6% by mass or less.

< 12 > the liquid skin cleansing agent according to any one of the above < 1 > - < 11 >, wherein the mass ratio (B)/(C) of the component (B) to the component (C) is preferably 1.7 or more, more preferably 2.2 or more, further preferably 2.8 or more, and further preferably 6 or less, more preferably 4.3 or less, further preferably 3.3 or less.

< 13 > the liquid skin cleansing agent according to any one of the above < 1 > to < 12 >, wherein the carbonate salt of the component (D) is preferably at least 1 selected from the group consisting of sodium carbonate, potassium carbonate, sodium hydrogencarbonate and potassium hydrogencarbonate, more preferably at least 1 selected from the group consisting of sodium carbonate and potassium carbonate, and at least 1 selected from the group consisting of sodium hydrogencarbonate and potassium hydrogencarbonate, and still more preferably sodium carbonate and sodium hydrogencarbonate.

< 14 > the liquid skin cleansing agent according to any one of the above < 1 > to < 13 >, wherein the content of the component (D) in the liquid skin cleansing agent is preferably 0.4% by mass or more, more preferably 1% by mass or more, further preferably 1.8% by mass or more, and further preferably 5% by mass or less, more preferably 3.5% by mass or less, further preferably 2.5% by mass or less.

< 15 > the liquid skin cleansing agent according to any one of the above < 1 > to < 14 >, wherein the polyol as the component (E) is a trihydric or higher polyol, preferably contains 1 or 2 or more selected from the group consisting of glycerin, diglycerin, sorbitol and maltitol, more preferably contains 1 or 2 selected from the group consisting of glycerin and diglycerin, and still more preferably contains glycerin.

< 16 > the liquid skin cleansing agent according to any one of the above < 1 > to < 15 >, wherein the polyol as the component (E) is a dihydric polyol, preferably containing 1 or 2 or more selected from the group consisting of ethylene glycol, propylene glycol, 1, 3-propanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol and isoprene glycol, more preferably containing 1 or 2 or more selected from the group consisting of propylene glycol, 1, 3-propanediol, 1, 3-butanediol, diethylene glycol and dipropylene glycol, and still more preferably containing 1 or 2 or more selected from the group consisting of propylene glycol, dipropylene glycol and 1, 3-butanediol.

The liquid skin cleanser according to any one of < 17 > to < 1 > to < 16 >, wherein the component (E) preferably contains a dihydric polyol.

< 18 > the liquid skin cleansing agent according to any one of the above < 1 > to < 17 >, wherein the content of the component (E) in the liquid skin cleansing agent is preferably 0.4% by mass or more, more preferably 0.7% by mass or more, further preferably 0.9% by mass or more, and further preferably 7.5% by mass or less, more preferably 3% by mass or less, further preferably 1.8% by mass or less.

< 19 > the liquid skin cleansing agent according to any one of the above < 1 > to < 18 >, wherein the mass ratio (B)/(E) of the component (B) to the component (E) is preferably 0.5 or more, more preferably 0.6 or more, further preferably 2.5 or more, and further preferably 10 or less, more preferably 6 or less, further preferably 5 or less.

< 20 > the liquid skin cleansing agent according to any one of the above < 1 > to < 19 >, wherein the content of water as the component (F) in the liquid skin cleansing agent is preferably 40% by mass or more, more preferably 50% by mass or more, further preferably 54% by mass or more, and further preferably 90% by mass or less, more preferably 85% by mass or less, further preferably 80% by mass or less.

< 21 > the liquid skin cleanser according to any one of the above < 1 > to < 20 >, wherein the cleanser further comprises (G) a water-soluble polymer.

< 22 > the liquid skin cleansing agent according to the above < 21 >, wherein the water-soluble polymer (G) is preferably selected from the group consisting of acrylic acid-alkyl (meth) acrylate copolymers, hydroxyethyl or hydroxypropyl added cellulose, highly polymerized polyalkylene glycols and cationic polymers, and more preferably cationic polymers.

< 23 > the liquid skin cleansing agent according to the above < 21 > or < 22 >, wherein the content of the component (G) in the liquid skin cleansing agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, further preferably 0.1% by mass or more, and further preferably 1.5% by mass or less, more preferably 0.8% by mass or less, further preferably 0.3% by mass or less.

< 24 > the liquid skin cleanser according to any one of the above < 1 > to < 23 >, which further comprises (H) a nonionic surfactant.

< 25 > the liquid skin cleansing agent according to the above < 24 >, wherein the HLB of the (H) nonionic surfactant is preferably 8 or more, more preferably 9 or more, and still more preferably 9.5 or more, and the HLB is preferably 18 or less, more preferably 16 or less, and still more preferably 14 or less.

< 26 > the liquid skin cleansing agent according to the above < 24 > or < 25 >, wherein the (H) nonionic surfactant preferably contains 1 or 2 or more selected from the group consisting of polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, alkyl polyglucosides and alkyl alkanolamides, more preferably contains an alkyl alkanolamide, and still more preferably contains an alkyl alkanolamide represented by the following general formula (5):

< 27 > the liquid skin cleansing agent according to any one of the above < 24 > to < 26 >, wherein the content of the component (H) in the liquid skin cleansing agent is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, further preferably 0.5% by mass or more, and further preferably 5% by mass or less, more preferably 3% by mass or less, further preferably 1% by mass or less.

< 28 > the liquid skin cleanser according to any one of the above < 1 > to < 27 >, further comprising (I) a pearling agent.

< 29 > the liquid skin cleansing agent according to the above < 28 >, wherein the pearling agent (I) is preferably at least 1 selected from the group consisting of ethylene glycol dioleate, ethylene glycol dilaurate, ethylene glycol distearate, propylene glycol dilaurate and propylene glycol distearate, and more preferably at least 1 selected from the group consisting of ethylene glycol dioleate, ethylene glycol dilaurate and ethylene glycol distearate.

The liquid skin cleansing agent according to < 30 > or < 29 > as described above, wherein the content of the component (I) in the liquid skin cleansing agent is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, further preferably 0.4% by mass or more, and further preferably 4% by mass or less, more preferably 3% by mass or less, further preferably 2% by mass or less.

< 31 > the liquid skin cleansing agent according to any one of the above < 1 > to < 30 >, wherein the content of the oily component in the liquid skin cleansing agent is preferably 3% by mass or less, more preferably 2% by mass or less, further preferably 1% by mass or less, and further preferably 0.5% by mass or less.

< 32 > the liquid skin cleansing agent according to any one of the above < 1 > to < 31 >, wherein the content of the cationic surfactant in the liquid skin cleansing agent is preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, and still more preferably 0.5% by mass or less.

< 33 > the liquid skin cleansing agent according to any one of the above < 1 > to < 32 >, wherein the liquid skin cleansing agent is preferably filled in a bag container or a bottle container, more preferably in a bottle container.

< 34 > the liquid skin cleansing agent according to any one of the above < 1 > to < 33 >, wherein the viscosity at 30 ℃ is preferably 1000 to 8500 mPas, more preferably 1100 to 80000 mPas, and still more preferably 1200 to 65000 mPas.

< 35 > the liquid skin cleansing agent according to any one of the above < 1 > to < 34 >, wherein the liquid skin cleansing agent is preferably a face cleansing agent, a bathing agent, or a hand washing agent, and more preferably a bathing agent.

< 36 > the liquid skin cleansing agent according to any one of the above < 1 > to < 35 >, wherein the liquid skin cleansing agent is used by applying the liquid skin cleansing agent to the skin, preferably any one of the scalp, face, body, hands and feet, and rinsing with water.

< 37 > a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F):

(A) a fatty acid salt containing at least 1 selected from salts of lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid: 5 to 18 mass%;

(B) an anionic surfactant containing at least 1 selected from the group consisting of alkyl sulfate salts, alkyl ether sulfate salts, and ether carboxylic acids or salts thereof: 2.2-7 mass%;

(C) an amphoteric surfactant containing at least 1 selected from the group consisting of a sulfobetaine-type surfactant and an amidobetaine-type surfactant: 0.2 to 4 mass%;

(D) a carbonate salt containing at least 1 selected from sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate: 0.2 to 7 mass%;

(E) polyol: 0.1 to 10 mass%;

(F) the amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3-10.

< 38 > a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F):

(A) a fatty acid salt containing at least 1 selected from salts of lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid: 5 to 18 mass%,

(E) polyol: 0.1 to 10 mass%;

(F) the amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 1.7 to 4.2, and the content ratio (B)/(E) of the component (B) to the component (E) is 0.5 to 10.

< 39 > a liquid skin cleanser comprising the following components (A), (B), (C), (D), (E) and (F):

(D) carbonate containing at least 1 of sodium carbonate, potassium carbonate, sodium bicarbonate and potassium bicarbonate: 0.2 to 7 mass%;

(E) polyol: 0.1 to 10 mass%,

(F) The amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 1.7 to 4.2, the content ratio (B)/(E) of the component (B) to the component (E) is 0.5 to 10, the component (E) contains a dihydric polyol, and the content of the dihydric polyol in the polyol is 5 mass% or more.

< 40 > a method for using the liquid skin cleansing agent according to any one of the above < 1 > to < 39 >, wherein the liquid skin cleansing agent is applied to the skin and then rinsed with water.

< 41 > A method for producing the liquid skin cleanser described in any one of the above < 1 > to < 39 >, the method comprising the following steps 1, 2, 3 and 4:

(step 1) heating the component (F) to 60 to 80 ℃ in advance;

(step 2) mixing the non-neutralized product of the component (A) with a neutralizing agent in the water heated in the step 1 so that the neutralization rate is 95 to 105%, thereby obtaining a fatty acid salt-containing composition;

(step 3) a step of adding and mixing the fatty acid salt-containing composition obtained in step 2, the component (B), the component (C), the component (D), the component (E), and other components added as needed, in this order;

(step 4) a step of cooling the mixture obtained in step 3 to 20 to 35 ℃.

< 42 > a method for producing a liquid skin cleansing agent according to any one of the above < 1 > -39 > wherein a part of the component (B) is an acidic component, comprising the following steps 1', 2', 3 'and 4':

(step 1') heating the component (F) to 60 to 80 ℃ in advance;

(step 2') mixing the unneutralized product of the component (A), the unneutralized product of the component (B), other acidic components added as needed, and a neutralizing agent in the water heated in the step 1' so that the neutralization rate is 95 to 105%, thereby obtaining a fatty acid salt-containing composition;

(step 3') a step of adding and mixing the fatty acid salt-containing composition obtained in step 2', the remainder of component (B), component (C), component (D), and component (E), and optionally other components other than the other acidic components, in this order;

(step 4') A step of cooling the mixture obtained in step 3' to 20 to 35 ℃.

[ examples ]

Examples 1 to 39 and comparative examples 1 to 13

Liquid skin cleansers having the compositions shown in tables 2 to 5 were produced, and the degree of satisfactory fusibility to water, foamability, cleansing power, the presence of non-sticky feeling during rinsing, and the smooth feeling of the skin were evaluated by measuring the viscosity and the viscosity upon addition of water. The results are also shown in tables 2 to 5.

(production method)

(step 1) the component (F) was heated to 80 ℃ in advance.

(step 2) the unneutralized product of the component (A), the unneutralized product of the component (B) (polyoxyethylene lauryl ether acetic acid), EDTA, and potassium hydroxide are mixed in the water heated in the step 1 so that the neutralization rate is 95 to 105%, thereby obtaining a fatty acid salt-containing composition.

(step 3) the fatty acid salt-containing composition obtained in step 2, and the remaining part of component (B) (sodium polyoxyethylene lauryl sulfate), component (C), component (D), component (E), component (G), component (H), and component (I) are added in this order and mixed.

(step 4) the mixture obtained in step 3 was cooled to 35 ℃.

(step 5) phenoxyethanol and a fragrance are added to the mixture obtained in step 4 in this order, and the mixture is mixed to obtain a liquid skin cleanser.

(evaluation method)

(1) Measurement of viscosity:

about 50g of each liquid skin cleansing agent was filled in a container (screw bottle (with cap and gasket), transparent, No.7, 50mL, 35 × 78 × 20mm (MARUEMU corporation)) so as not to generate bubbles, and left to stand in a water bath set at 30 ℃ for about 1 hour to adjust the temperature, and then the viscosity was measured for a measurement time of 1 minute. For the VISCOMETER, a B-type VISCOMETER/VISCOMETER TVB-10M (TOKI SANGYO CO., LTD) was used.

First, measurement is performed under the condition (i), and if the measured value is within the accuracy range and a stable measured value can be obtained, the measured value is used. However, if the measured value is outside the accuracy range or cannot be stably measured due to the upper and lower limits of the accuracy range, the measurement is performed under the condition (ii). This operation was repeated to obtain a stable measurement value. The time for measuring the composition at each revolution was set to 1 minute.

(i)No.M4：6rpm

(ii)No.M4：12rpm

(iii)No.M4：30rpm

(iv)No.M3：30rpm

(v)No.M2：30rpm

(iv)No.M1：30rpm

(2) Viscosity measurement with addition of Water:

50g of each liquid skin cleanser was measured accurately and put into a 100mL beaker, and after 2g of ion-exchanged water was added, the sample was stirred for 30 minutes without generating air bubbles to adjust the sample.

Then, the viscosity was measured in the same manner as in (1).

Further, the ratio of the viscosity upon addition of water to the viscosity measured in (1) (viscosity/viscosity upon addition of water) was obtained. If the value is 1.0 or less, it means that thickening does not occur when water is added.

(3) Good degree of fusibility with water:

each liquid skin cleanser 0.5g was taken out by 3 panelists, placed in the palm of the hand, and 5g of water was added, and the hands were rubbed 10 times, and the degree of good fusibility with water at this time was evaluated in 5 stages, with a case of very good fusibility with water being evaluated as 5, and a case of very poor fusibility with water being evaluated as 1. The results were averaged over 3 examiners, expressed as a value rounded to the first decimal point.

(4) Foaming property:

each liquid skin cleanser 0.5g was taken out by 3 panelists, placed in the palm of the hand, and 5g of water was added, and the hands were rubbed 10 times, and the foamability at this time was evaluated in 5 stages so that the case of good foamability was 5 and the case of poor foamability was 1. The results were averaged over 3 examiners, expressed as a value rounded to the first decimal point.

(5) Cleaning force:

20. mu.L of model acne sebum (Table 1) colored with carbon black was smeared on the forearm of 3.5 cm.phi into a circle by 3 professional examiners, dried for 30 minutes, and 1g of 2.5 mass% aqueous solution of each liquid skin cleanser was taken, gently massaged 10 times in a circle-drawing manner with the index finger, and then thoroughly rinsed with tap water. The state after cleaning was evaluated in 5 stages, with a state completely free of dirt evaluated as 5 and a state completely free of dirt evaluated as 1. The results were averaged over 3 examiners, expressed as a value rounded to the first decimal point.

(6) No sticky feeling during rinsing:

the forearm of one-sided arm was cleaned by 3 panelists using 0.5g of each liquid skin cleanser, and the evaluation was performed in 5 stages in such a manner that the none-sticky state was evaluated as 5 and the very sticky state was evaluated as 1, in view of the presence or absence of sticky feeling during rinsing. The results were averaged over 3 examiners, expressed as a value rounded to the first decimal point.

(7) Smooth feeling of skin:

the forearm of one-sided arm was cleaned by 3 panelists using 0.5g of each liquid skin cleanser, and the smooth feeling of the skin was evaluated 1 minute after wiping with a towel. Evaluation was performed at stage 5 in such a manner that the state of very smooth skin was evaluated as 5 and the state of very rough skin was evaluated as 1. The results were averaged over 3 examiners, expressed as a value rounded to the first decimal point.

[ Table 1]

(model acne sebum)

Composition (I)	(parts by mass)
		Squalene	8.0
Candle (myristic acid myristyl ester)	14.0
		Cottonseed oil	7.2
Cholesterol	12.0
		Cholesterol ester	4.0
Lauric acid	0.8
		Myristic acid	6.4
Palmitic acid	24.8
		Stearic acid	4.8
Oleic acid	18.8
		Total up to	100.8

[ Table 5]

The liquid skin cleansing agent of the present invention exhibits excellent effects in suppressing any of thickening when water is added, fusibility with water, foaming properties, cleansing power, smooth feeling of the skin, sticky feeling during rinsing, and the like.

However, it is clear from comparative examples 1 to 4 that: when the content of the anionic surfactant other than the fatty acid salt of the component (B) is increased, the smooth feeling of the skin is improved, but thickening occurs when water is added, and the fusibility with water is remarkably reduced. On the other hand, it is known that: in examples 7 to 11 containing the polyol as the component (E), thickening of the skin was suppressed even when the component (B) was contained in a large amount, and the skin had good water-binding property and smooth feeling.

In comparative examples 5 to 13, which lack some of the components of the present invention, the liquid skin cleansing agent of the present invention was significantly inferior to any of the water-binding property, foaming property, cleansing power, smooth feeling of the skin, and sticky feeling during rinsing.

Examples 40 and 41

Liquid skin cleansers having the compositions shown in tables 6 and 7, which were filled in bottle containers, were produced in the same manner as in examples 1 to 39.

The obtained liquid skin cleansing agent has suppressed thickening when water is added, excellent water-binding property, good foamability, excellent cleansing power, suppressed sticky feeling during rinsing, and smooth feeling of the cleansed skin.

[ Table 6]

[ Table 7]

Claims

1. A liquid skin cleanser, wherein,

comprises the following components (A), (B), (C), (D), (E) and (F):

(A) fatty acid salts: 5 to 18 mass%;

(B) an anionic surfactant other than the component (A): 2.2-7 mass%;

(C) amphoteric surfactant: 0.2 to 4 mass%;

(D) carbonate salt: 0.2 to 7 mass%;

(E) polyol: 0.1 to 10 mass%;

(F) the amount of water is controlled by the amount of water,

the mass ratio (B)/(C) of the component (B) to the component (C) is 5/3-10.

2. The liquid skin cleanser of claim 1, wherein,

the mass ratio (B)/(E) of the component (B) to the component (E) is 0.5 to 10.

3. The liquid skin cleanser of claim 1 or 2, wherein,

the mass ratio (B)/(C) of the component (B) to the component (C) is 1.7 to 6.

4. The liquid skin cleanser according to any one of claims 1 to 3,

the component (B) is at least 1 selected from alkyl sulfate, alkyl ether sulfate and alkyl ether carboxylate.

5. The liquid skin cleanser according to any one of claims 1 to 4,

the component (C) is at least 1 selected from sulfobetaine surfactants and amidobetaine surfactants.

6. The liquid skin cleanser according to any one of claims 1 to 5,

the component (E) contains a dihydric polyol.

7. The liquid skin cleanser according to any one of claims 1 to 6,

(F) the water content is 40 to 90 mass%.

8. The liquid skin cleanser according to any one of claims 1 to 7,

further contains (G) 0.01 to 1.5 mass% of a water-soluble polymer.

9. The liquid skin cleanser of claim 8, wherein,

the component (G) is at least 1 selected from acrylic acid-alkyl (meth) acrylate copolymers, hydroxyethyl or hydroxypropyl added cellulose, high-polymerized polyethylene glycol and cationic polymers.

10. The liquid skin cleanser of claim 8 or 9, wherein,

the component (G) is a cationic polymer.

11. A method of using a liquid skin cleanser, wherein,

the use method is a method of using the liquid skin cleanser according to any one of claims 1 to 10,

the application method comprises applying the liquid skin cleanser on skin, and washing with water.

12. A method for producing a liquid skin cleanser, wherein,

the method for producing the liquid skin cleanser according to any one of claims 1 to 10, comprising the following steps 1, 2, 3 and 4,

step 1: a step of heating the component (F) to 60 to 80 ℃ in advance;

and a step 2: a step of mixing an unneutralized product of the component (A) and a neutralizer in the water heated in the step 1 so that the neutralization rate is 95-105% to obtain a fatty acid salt-containing composition;

step 3: a step of sequentially adding and mixing the fatty acid salt-containing composition obtained in the step 2, the component (B), the component (C), the component (D), and the component (E), and other components added as needed;

and step 4: and (3) cooling the mixture obtained in the step (3) to 20 to 35 ℃.

13. A method for producing a liquid skin cleanser, wherein,

the method for producing the liquid skin cleansing agent according to any one of claims 1 to 10, wherein a part of the component (B) is an acidic component, and the method comprises the following steps 1', 2', 3', and 4':

step 1': a step of heating the component (F) to 60 to 80 ℃ in advance;

step 2': a step of mixing the unneutralized product of the component (a), the unneutralized product of the component (B), other acidic components added as needed, and a neutralizing agent in water heated in the step 1' so that the neutralization rate is 95 to 105%, thereby obtaining a fatty acid salt-containing composition;

step 3': a step of adding and mixing the fatty acid salt-containing composition obtained in the step 2', the remainder of the component (B), the component (C), the component (D), and the component (E) in this order, and if necessary, other components than other acidic components;

and step 4: and a step of cooling the mixture obtained in the step 3' to 20 to 35 ℃.