Liquid skin cleansing agent composition

Abstract

It has excellent lathering ability, foam retention, and prevents dirt from transferring to the foam, leaves no slimy feeling after rinsing, provides a refreshing feeling after rinsing, and does not leave a dry feeling after towel drying. To provide a liquid skin cleansing agent composition. [Solution] A liquid skin cleansing composition containing (A) an anionic surfactant, (B) a chelating agent, and (C) an alkylaminocarboxylic acid type amphoteric surfactant, wherein the mass ratio [(B) / (C)] of the mass of component (B) to the mass of component (C) is 0.60 or more and 5.00.

Description

[Technical Field]

[0001] The present invention relates to a liquid skin cleansing agent composition. [Background technology]

[0002] In recent years, there has been a growing demand for liquid skin cleansing compositions that provide good foam quality and offer a clear sense of cleanliness and a noticeable clean feeling after washing, making handwashing easier for people of all ages.

[0003] For example, a detergent composition containing a fatty acid salt, an amphoteric surfactant, and a compound with an acid dissociation index of 8.0 to 11.0 has been proposed, which provides good foam quality (see Patent Document 1). Furthermore, a detergent composition containing a fatty acid salt, an alkylaminocarboxylic acid-type amphoteric surfactant, and a chelating agent has been proposed, which provides good foaming and rinsing properties (see Patent Document 2). However, when an amphoteric surfactant is incorporated into a detergent composition, it can become sticky, making it difficult to determine when rinsing is complete, hindering the perception of the cleaning effect, and resulting in a less refreshing feeling after rinsing.

[0004] Furthermore, a skin cleansing composition has been proposed that contains a cleansing surfactant such as an anionic surfactant, cationized cellulose, and a dialkyldiallyl quaternary ammonium salt / acrylamide copolymer, which provides good lathering during washing, sufficient cleansing effect, does not leave the skin feeling tight after washing, and provides a moist and supple feeling to the skin after drying, resulting in excellent skin conditioning effects (see Patent Document 3). However, even with this proposed skin cleansing composition, it can be difficult to feel refreshed after rinsing.

[0005] Therefore, there is a need for a liquid skin cleansing agent composition that is excellent in lathering, foam retention, and color transfer of dirt to the foam, leaves no slimy feeling after rinsing, provides a refreshing feeling after rinsing, and does not leave a dry feeling after towel drying. [Prior art documents] [Patent Documents]

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0007] The present invention aims to solve the above-mentioned conventional problems and achieve the following objectives. That is, the present invention aims to provide a liquid skin cleansing composition that is excellent in foaming, foam retention, and color transfer of dirt to foam, has no slimy feeling after rinsing, has a refreshing feeling after rinsing, and has no bulky feeling after towel drying.

Means for Solving the Problems

[0008] As a result of intensive studies to achieve the above object, the present inventor has found that a liquid skin cleansing composition containing (A) an anionic surfactant, (B) a chelating agent, and (C) an alkylaminocarboxylic acid type amphoteric surfactant, and having a mass ratio [(B) / (C)] of the mass of the component (B) to the mass of the component (C) of 0.60 or more and 5.00 is excellent in foaming, foam retention, and color transfer of dirt to foam, has no slimy feeling after rinsing, has a refreshing feeling after rinsing, and has no bulky feeling after towel drying, and thus has completed the present invention.

[0009] The present invention is based on the above findings by the present inventors, and the means for solving the above problems are as follows. That is, <1> (A) an anionic surfactant, (B) a chelating agent, (C) an alkylaminocarboxylic acid type amphoteric surfactant, and contains The liquid skin cleansing composition is characterized in that the mass ratio [(B) / (C)] of the mass of the component (B) to the mass of the component (C) is 0.60 or more and 5.00. <2> The content of the component (A) is 3% by mass or more and 7% by mass or less, The content of the component (B) is 0.3% by mass or more and 1.7% by mass or less, The content of the component (C) is 0.4% by mass or more and 4.5% by mass or less, The liquid skin cleansing composition according to <1>.

Effects of the Invention

[0010] According to the present invention, the above-mentioned various problems in the prior art can be solved and the above-mentioned object can be achieved. The composition has excellent foaming, foam retention, and color transfer of dirt to foam, has no slimy feeling after rinsing, has a refreshing feeling after rinsing, and can provide a liquid skin cleansing composition that has no bulky feeling after towel drying.

Modes for Carrying Out the Invention

[0011] (Liquid Skin Cleansing Composition) The liquid skin cleansing composition of the present invention contains (A) an anionic surfactant, (B) a chelating agent, and (C) an alkylaminocarboxylic acid type amphoteric surfactant. The liquid skin cleansing composition of the present invention may further contain other components as necessary.

[0012] In this specification, the “(A) anionic surfactant” may be referred to as “(A)” or “component (A)”. The “(B) chelating agent” may be referred to as “(B)” or “component (B)”. The “(C) alkylaminocarboxylic acid type amphoteric surfactant” may be referred to as “(C)” or “component (C)”.

[0013] In addition, in this specification, “~” indicating a numerical range means including the numerical values described before and after it as the lower limit value and the upper limit value, unless otherwise specified.<s

[0014] <(A) Anionic surfactants> The anionic surfactant, which is component (A) above, primarily imparts good foaming properties to the liquid skin cleansing composition.

[0015] There are no particular restrictions on component (A), and it can be appropriately selected depending on the purpose. Examples include higher fatty acid salts, polyoxyethylene alkyl ether sulfates, ether carboxylic acids, or salts thereof. These may be used individually or in combination of two or more. Among these, higher fatty acid salts are preferred as component (A) from the viewpoint of good foaming and the absence of a slimy feeling after rinsing.

[0016] -High-grade fatty acid salts- There are no particular restrictions on the aforementioned higher fatty acid salts, and they can be appropriately selected according to the purpose. However, it is preferable that the higher fatty acid salt has 12 to 18 carbon atoms in the fatty acid, and more preferably that it has 12 to 16 carbon atoms in the fatty acid.

[0017] There are no particular restrictions on the counterions used in the aforementioned higher fatty acid salts, and they can be appropriately selected depending on the purpose. Examples include alkali metal ions, ammonium ions, alkanolamines, and basic amino acids.

[0018] There are no particular restrictions on the alkali metal ions, and they can be appropriately selected depending on the purpose. Examples include sodium ions and potassium ions.

[0019] The aforementioned alkanolamine is not particularly limited and can be appropriately selected depending on the purpose. Examples include monoethanolamine, diethanolamine, and triethanolamine.

[0020] The basic amino acid mentioned above is not particularly limited and can be appropriately selected depending on the purpose; examples include lysine and arginine.

[0021] The aforementioned higher fatty acid salt can be incorporated as a higher fatty acid salt in the production of the liquid skin cleansing composition, or it may be formed by separately adding the higher fatty acid and a counter-ion salt (for example, potassium hydroxide, triethanolamine, monoethanolamine, etc.) to the mixing tank and undergoing a neutralization reaction.

[0022] The higher fatty acid used in the preparation of the higher fatty acid salt may be one that has been synthesized as appropriate, or a commercially available product may be used. Examples of commercially available higher fatty acids include those with trade names such as NAA(registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA(registered trademark)-142 (myristic acid, manufactured by NOF Corporation), NAA(registered trademark)-160 (palmitic acid, manufactured by NOF Corporation), and NAA(registered trademark)-180 (stearic acid, manufactured by NOF Corporation).

[0023] Examples of higher fatty acid salts with 12 to 18 carbon atoms include laurate, myristic acid, palmitate, and stearate. These may be used individually or in combination of two or more. Specific examples of higher fatty acid salts with 12 to 18 carbon atoms include sodium laurate, sodium myristate, sodium palmitate, sodium stearate, potassium laurate, potassium myristate, potassium palmitate, and potassium stearate. Among these, laurate, myristic acid, and palmitate are preferred as higher fatty acid salts with 12 to 18 carbon atoms from the viewpoint of good foaming and lack of slipperiness after rinsing, while potassium laurate, potassium myristate, and potassium palmitate are more preferred.

[0024] The aforementioned higher fatty acid salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available higher fatty acid salts include, by trade name, NIKKOL Potassium Laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL Potassium Myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), Nonsal® PK-1 (potassium palmitate, manufactured by NOF Corporation), and Nonsal® SK-1 (potassium stearate, manufactured by NOF Corporation).

[0025] -Polyoxyethylene alkyl ether sulfate- The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose. For example, a compound represented by the following general formula (A1) can be used. The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more types. In this specification, "polyoxyethylene" may be written as "POE".

[0026] [ka] In the above general formula (A1), R 1 represents a linear or branched alkyl group, n represents the average number of moles of ethylene oxide (hereinafter sometimes abbreviated as "EO") added, and X represents an alkali metal or ammonium.

[0027] In the above general formula (A1), R 1 There are no particular restrictions on the number of carbon atoms, but 5 to 23 is preferred, and 10 to 14 is preferred. Also, in the general formula (A1) above, R 1 A linear alkyl group is preferred.

[0028] In the above general formula (A1), there are no particular restrictions on the average number of moles of ethylene oxide added to n, but 1 to 5 is preferred, and 1 to 3 is more preferred.

[0029] In the general formula (A1) above, there are no particular restrictions on the alkali metal X, and it can be appropriately selected depending on the purpose, for example, sodium, potassium, etc.

[0030] Specific examples of the aforementioned polyoxyethylene alkyl ether sulfates include sodium polyoxyethylene (1) lauryl ether sulfate (also known as POE(1) sodium laureth sulfate), sodium polyoxyethylene (2) lauryl ether sulfate (also known as POE(2) sodium laureth sulfate), sodium polyoxyethylene (3) lauryl ether sulfate (also known as POE(3) sodium laureth sulfate), sodium polyoxyethylene (4) lauryl ether sulfate (also known as POE(4) sodium laureth sulfate), sodium polyoxyethylene (5) lauryl ether sulfate (also known as POE(5) sodium laureth sulfate), sodium polyoxyethylene (3) alkyl(C12,13) ​​ether sulfate (also known as (C12,13) ​​pareth-3 sulfate), ammonium polyoxyethylene (2) lauryl ether sulfate (also known as POE(2) ammonium laureth sulfate), and ammonium polyoxyethylene (3) lauryl ether sulfate (also known as POE(3) ammonium laureth sulfate). The number in parentheses after "polyoxyethylene" or "POE" represents the average number of moles (n) of ethylene oxide (EO) added. The number in parentheses after "alkyl" represents the alkyl group (R 1 This represents the number of carbon atoms in a molecule.

[0031] The polyoxyethylene alkyl ether sulfate may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available polyoxyethylene alkyl ether sulfates include, by trade name, Emal 125A (polyoxyethylene (1) lauryl ether sulfate sodium, manufactured by Kao Corporation), Shinolin SPE-1250 (polyoxyethylene (2) lauryl ether sulfate sodium, manufactured by Shin Nippon Rika Co., Ltd.), and Emal 20C (polyoxyethylene (3) lauryl ether sulfate sodium, manufactured by Kao Corporation).

[0032] - Ether carboxylic acid or its salt - The ether carboxylic acid or its salt is not particularly limited and can be appropriately selected according to the purpose. For example, compounds represented by the following general formula (A2), compounds represented by the following general formula (A3), etc. may be mentioned. The ether carboxylic acid or its salt may be used alone or in combination of two or more. Among these, as the ether carboxylic acid or its salt, a compound represented by the following general formula (A2) is preferable.

[0033]

Chemical formula

[0034] In the general formula (A2), the number of carbon atoms of R 2 is preferably 10 to 14. Also, in the general formula (A2), R 2 is preferably a linear alkyl group.

[0035] In the general formula (A2), "each independently" for R 3 means that two or more R 3 may be the same as each other or different from each other. In the general formula (A2), the number of carbon atoms of R 3 is preferably 2.

[0036]

[0037] In the general formula (A2), o is preferably 1 to 5.

[0037] Among these, polyoxyalkylene alkyl ether carboxylic acid or a salt thereof is more preferred as the compound represented by the general formula (A2), and polyoxyethylene alkyl ether acetic acid or a salt thereof is even more preferred.

[0038] Specific examples of compounds represented by the general formula (A2) include sodium polyoxyethylene (3) lauryl ether acetate (also known as sodium laureth-4 carboxylate), potassium polyoxyethylene (4) lauryl ether acetate, sodium lauryl glycol acetate, and polyoxyethylene (4) lauryl ether acetate. The numbers in parentheses above represent the average number of added moles (o) of alkylene oxide.

[0039] [ka] In the above general formula (A3), R 4 This represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, M 2 This represents a hydrogen atom, alkali metal, alkaline earth metal, ammonium, or basic amino acid.

[0040] In the above general formula (A3), R 4 The number of carbon atoms is preferably 10 to 14. Also, in the general formula (A3) above, R 4 A linear alkyl group is preferred.

[0041] Specific examples of compounds represented by the general formula (A3) include sodium polyoxyethylene (3) lauryl ether acetate, potassium polyoxyethylene (4) lauryl ether acetate, and sodium lauryl glycol acetate. The numbers in parentheses above represent the average number of added moles (o) of alkylene oxide.

[0042] The aforementioned ether carboxylic acid or its salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available ether carboxylic acid or its salt include, by trade name, Energikol EC-30 (sodium polyoxyethylene(3) lauryl ether acetate, manufactured by Lion Specialty Chemicals Co., Ltd.), Viewlight® LCA-25F (sodium polyoxyethylene(3) lauryl ether acetate), Viewlight® LCA-30D (sodium polyoxyethylene(3) lauryl ether acetate), Viewlight® LCA-H (polyoxyethylene(4) lauryl ether acetate), Viewlight® LCA-25NH (polyoxyethylene(3) lauryl ether acetate), Viewlight® SHAA (sodium lauryl glycol carboxylate), and Viewlight®. Examples include LCA (polyoxyethylene(3) lauryl ether sodium acetate) (manufactured by Sanyo Chemical Industries, Ltd.), Kao Akipo RLM-45NV (polyoxyethylene(4.5) lauryl ether sodium acetate), and Kao Akipo RLM-100NV (polyoxyethylene(10) lauryl ether sodium acetate) (manufactured by Kao Corporation). The numbers in parentheses above represent the average number of added moles (o) of alkylene oxide.

[0043] There are no particular restrictions on the content of component (A), and it can be appropriately selected according to the purpose. However, from the viewpoint of good foaming and the absence of a slimy feeling after rinsing, it is preferable that the content be 1% by mass or more and 25% by mass or less, more preferably 3% by mass or more and 7% by mass or less, and particularly preferably 5% by mass or more and 7% by mass or less, based on the total mass of the liquid skin cleansing composition. When the content of component (A) is 1.0% by mass or more based on the total mass of the liquid skin cleansing composition, foaming is good. Also, when the content of component (A) is 25% by mass or less based on the total mass of the liquid skin cleansing composition, the absence of a slimy feeling after rinsing is good.

[0044] <(B) Chelating agent> The chelating agent, which is component (B) above, primarily imparts good foaming properties to the liquid skin cleansing composition.

[0045] There are no particular restrictions on the aforementioned component (B), and it can be appropriately selected depending on the purpose. Examples include ethylenediaminetetraacetic acid (sometimes referred to as "EDTA" or "EDTA") or its salts, cyclohexanediaminetetraacetic acid (CDTA) or its salts, 1-hydroxyethane-1,1-diphosphonic acid or its salts, oxalic acid or its salts, citric acid or its salts, polyphosphate or its salts, metaphosphate or its salts. These may be used individually or in combination of two or more. Among these, ethylenediaminetetraacetic acid or its salts are preferred as component (B) from the viewpoint of good foaming.

[0046] The aforementioned component (B) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of the aforementioned component (B) include, by trade name, Disolvin® Z (EDTA), Disolvin® NA2-S (disodium EDTA), Disolvin® NA-X (tetrasodium EDTA) (all manufactured by Nurion Japan Co., Ltd.), Kirest 2C-SD (trisodium EDTA, manufactured by Kirest Co., Ltd.), trans-1,2-cyclohexanediaminetetraacetic acid (monohydrate) (manufactured by Kishida Chemical Co., Ltd.), Feliox 115-A (1-hydroxyethane-1,1-diphosphonic acid, manufactured by Lion Specialty Chemicals Co., Ltd.), oxalic acid (manufactured by Mitsubishi Gas Chemical Trading Co., Ltd.), citric acid (manufactured by Komatsuya Co., Ltd.), sodium polyphosphate (manufactured by Yoneyama Chemical Co., Ltd.), and sodium metaphosphate (manufactured by Yoneyama Chemical Co., Ltd.).

[0047] There are no particular restrictions on the content of component (B) and it can be appropriately selected according to the purpose, but from the viewpoint of good lathering and lack of dryness after towel drying, it is preferable that the content is 0.2% by mass or more and 2.0% by mass or less, more preferably 0.3% by mass or more and 1.7% by mass or less, and particularly preferably 0.4% by mass or more and 1.5% by mass or less, relative to the total mass of the liquid skin cleansing composition. When the content of component (B) is 0.2% by mass or more relative to the total mass of the liquid skin cleansing composition, it lathers well. Furthermore, when the content of component (B) is 2.0% by mass or less relative to the total mass of the liquid skin cleansing composition, it is good that there is no dryness after towel drying.

[0048] <(C) Alkylaminocarboxylic acid type amphoteric surfactant> The alkylaminocarboxylic acid type amphoteric surfactant, which is component (C) above, mainly imparts good foam retention to the liquid skin cleansing composition.

[0049] There are no particular restrictions on the aforementioned (C) component, and it can be appropriately selected depending on the purpose. Examples include compounds represented by the following general formula (C1) and compounds represented by the following general formula (C2). The ether carboxylic acid or its salt may be used alone or in combination of two or more.

[0050] [ka] In the above general formula (C1), R 5 k represents a linear or branched alkyl group, alkenyl group, or hydroxyalkyl group having 6 to 22 carbon atoms, k represents an integer from 1 to 4, and M 3 This refers to a mono, di, or trialkanolamine having a hydrogen atom, alkali metal, ammonium, or an alkanol group having 2 to 3 carbon atoms.

[0051] In the above general formula (C1), R 5 The number of carbon atoms is preferably 10 to 18, and more preferably 10 to 16.

[0052] In the above general formula (C1), R 5 Examples of alkyl groups having 6 to 22 carbon atoms include octyl, nonyl, decyl, undecyl, lauryl, tridecyl, myristyl, pentadecyl, palmityl, stearyl, isostearyl, nonadecyl, and eicosyl groups. In addition, in the above general formula (C1), R 5 Examples of alkenyl groups having 6 to 22 carbon atoms include tetradecenyl, hexadecenyl, octadecenyl, isooctadecenyl, and eicocenyl groups. Among these, from the viewpoint of good foam retention, in the general formula (C1) above, R 5 The alkyl group is preferably a C10-C18 alkyl group, more preferably a lauryl group, myristyl group, palmityl group, or stearyl group, and particularly preferably a lauryl group.

[0053] In the above general formula (C1), M 3 Examples of alkali metals include lithium, sodium, and potassium. Also, in the general formula (C1) above, M 3 Among these, mono, di, or trialkanolamines having an alkanol group with 2 to 3 carbon atoms include, for example, monoethanolamine, diethanolamine, and triethanolamine. Among these, in the general formula (C1), M 3 Sodium, potassium, or triethanolamine are preferred as the base material.

[0054] Specific examples of compounds represented by the general formula (C1) include laurylaminoacetate, laurylaminopropionate, myristylaminopropionate, and laurylaminopropionate. These may be used individually or in combination of two or more. Among these, sodium laurylaminoacetate, sodium laurylaminopropionate, potassium laurylaminopropionate, sodium myristylaminopropionate, potassium myristylaminopropionate, and triethanolamine laurylaminopropionate are preferred as compounds represented by the general formula (C1), with sodium laurylaminopropionate being more preferred.

[0055] [ka] In the above general formula (C2), R 6 represents a linear or branched alkyl group, alkenyl group, or hydroxyalkyl group having 6 to 22 carbon atoms, and m and n each independently represent an integer from 1 to 4. 4 and M 5 Each of these independently represents a mono, di, or trialkanolamine having a hydrogen atom, an alkali metal, an ammonium compound, or an alkanol group having 2 to 3 carbon atoms.

[0056] The phrase "m and n are independent of each other" means that m and n may be the same as or different from each other.

[0057] M 4 and M 5 But "each independently" means M 4 and M 5 However, this means that they may be identical or different to each other.

[0058] In the above general formula (C2), M 4 and M 5 Examples of alkali metals include lithium, sodium, and potassium. Also, in the general formula (C2) above, M4 and M 5 Among these, mono, di, or trialkanolamines having an alkanol group with 2 to 3 carbon atoms include, for example, monoethanolamine, diethanolamine, and triethanolamine. Among these, in the general formula (C2), M 4 and M 5 Sodium, potassium, or triethanolamine are preferred as the base material.

[0059] In the above general formula (C2), R 6 The number of carbon atoms is preferably 10 to 18, and more preferably 10 to 16.

[0060] In the above general formula (C2), R 6 Examples of alkyl groups having 6 to 22 carbon atoms include octyl, nonyl, decyl, undecyl, lauryl, tridecyl, myristyl, pentadecyl, palmityl, stearyl, isostearyl, nonadecyl, and eicosyl groups. In addition, in the above general formula (C2), R 6 Examples of alkenyl groups having 6 to 22 carbon atoms include tetradecenyl, hexadecenyl, octadecenyl, isooctadecenyl, and eicocenyl groups. Among these, from the viewpoint of good foam retention, in the general formula (C2) above, R 6 The alkyl group is preferably a C10-C18 alkyl group, more preferably a lauryl group, myristyl group, palmityl group, or stearyl group, and particularly preferably a lauryl group.

[0061] Specific examples of compounds represented by the general formula (C2) include laurylaminodiacetate, myristylaminodiacetate, palmitylaminodiacetate, stearylaminodiacetate, laurylaminodipropionate, myristylaminodipropionate, palmitylaminodipropionate, and stearylaminodipropionate. These may be used individually or in combination of two or more. Among these, the compounds represented by the general formula (C2) above are preferably laurylaminodiacetate triethanolamine, laurylaminodiacetate potassium, myristylaminodiacetate sodium, myristylaminodiacetate potassium, palmitylaminodiacetate sodium, palmitylaminodiacetate potassium, stearylaminodiacetate sodium, stearylaminodiacetate potassium, laurylaminodipropionate potassium, myristylaminodipropionate sodium, myristylaminodipropionate potassium, palmitylaminodipropionate sodium, palmitylaminodipropionate potassium, stearylaminodipropionate sodium, stearylaminodipropionate potassium, etc., and more preferably laurylaminodipropionate potassium, laurylaminodiacetate triethanolamine, laurylaminodiacetate potassium, etc.

[0062] Among these, the compound represented by the general formula (C1) is preferred as component (C) from the viewpoint of good foam retention, and sodium laurylaminopropionate is more preferred.

[0063] There are no particular restrictions on the content of component (C) and it can be appropriately selected according to the purpose, but from the viewpoint of good foam retention and absence of a slimy feeling after rinsing, it is preferable that the content is 0.3% by mass or more and 5.0% by mass or less, and more preferably 0.4% by mass or more and 3.5% by mass or less, relative to the total mass of the liquid skin cleansing composition. When the content of component (C) is 0.3% by mass or more relative to the total mass of the liquid skin cleansing composition, the foam retention is good. Furthermore, when the content of component (C) is 5.0% by mass or less relative to the total mass of the liquid skin cleansing composition, the absence of a slimy feeling after rinsing is good.

[0064] <<Mass ratio [(B) / (C)]>> The mass ratio [(B) / (C)] of component (B) to the mass of component (C) is 0.60 to 5.00, but preferably 0.80 to 3.00, and more preferably 1.00 to 2.00, from the viewpoint of excellent color transfer of dirt to foam and good refreshing feeling after rinsing. If the mass ratio [(B) / (C)] is less than 0.60, a refreshing feeling after rinsing cannot be obtained. Also, if the mass ratio [(B) / (C)] exceeds 5.00, the color transfer of dirt to foam decreases. On the other hand, if the mass ratio [(B) / (C)] is 0.60 to 5.00, both color transfer of dirt to foam and a refreshing feeling after rinsing are excellent.

[0065] <Other ingredients> In addition to the components (A), (B), and (C) described above, the liquid skin cleansing composition may contain other components as needed, provided that they do not impair the effects of the present invention.

[0066] Examples of the aforementioned other components include surfactants other than those described in (A) and (C), water-soluble polymers, oils, silicones, alcohols, lanolin derivatives, protein derivatives, amino acids, pharmaceuticals, bactericides, humectants, preservatives, pH adjusters, antioxidants, chelating agents, UV absorbers, UV scatterers, plant and animal extracts or their derivatives, chelating agents other than those described in (B), dyes, fragrances, pigments, inorganic powders, clay minerals, and water-insoluble polymer compound powders (e.g., nylon, polyethylene, etc.). These may be used individually or in combination of two or more.

[0067] The aforementioned other components may be synthesized as appropriate or commercially available products may be used. There are no particular restrictions on the content of the aforementioned other components in the liquid skin cleansing composition, and they can be appropriately selected depending on the purpose.

[0068] -Surfactants other than component (A) and component (C)- Examples of surfactants other than component (A) and component (C) include cationic surfactants, semipolar surfactants, and nonionic surfactants.

[0069] -Water-soluble polymer- The aforementioned water-soluble polymer is not particularly limited and can be appropriately selected depending on the purpose. Examples include cationic polymers such as dimethyldiallylammonium chloride polymer and dimethyldiallylammonium chloride-acrylic acid copolymer. These may be used individually or in combination of two or more.

[0070] Examples of the dimethyldiallylammonium chloride polymer include compounds represented by the following general formula (1).

[0071] [ka] However, in the general formula (1) above, p and q represent the molar ratio (mol%) of each structural unit, where p + q = 100, and preferably q is 40 mol% or more.

[0072] There are no particular restrictions on the molar ratio of structural units derived from dimethyldiallylammonium chloride in the dimethyldiallylammonium chloride-acrylic acid copolymer, and it can be appropriately selected depending on the purpose, but 40 mol% or more is preferred, 65 mol% or more is more preferred, and 90 mol% or more is even more preferred.

[0073] The molar ratio of each structural unit in the dimethyldiallylammonium chloride polymer and the dimethyldiallylammonium chloride-acrylic acid copolymer can be determined by measuring under the following measurement conditions using nuclear magnetic resonance (NMR). [Measurement conditions] Solvent: Deuterium water (D2O) Measuring instrument: JNM-LA300 (300MHz, manufactured by JEOL Ltd.)

[0074] There are no particular restrictions on the weight-average molecular weight of the cationic polymer, and it can be appropriately selected depending on the purpose, but it is preferably 10,000 to 1,000,000, and more preferably 15,000 to 450,000.

[0075] The weight-average molecular weight of the cationic polymer can be determined, for example, by measuring it using the SEC-MALLS-RI system under the following measurement conditions. [Measurement conditions] Column: TSKgel® α series α-M column, 30cm (manufactured by Tosoh Corporation) Solvent: 0.3M sodium nitrate aqueous solution

[0076] The viscosity at 25°C in a solution of the cationic polymer with a solid content of 30% to 44% by mass is not particularly limited and can be appropriately selected depending on the purpose, but is preferably 10 mPa·s to 15,000 mPa·s and more preferably 20 mPa·s to 12,000 mPa·s.

[0077] The viscosity of the cationic polymer can be measured, for example, using a Brookfield viscometer LVF (manufactured by Brookfield).

[0078] The cationic polymer may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available cationic polymers include the following, by trade name:

[0079] MERQUAT 100 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 39% to 44% by mass: 8,000 mPa·s to 12,000 mPa·s, Weight-average molecular weight: 150,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, with a rotor of spindle No. 3, and under conditions of 6 revolutions per minute.

[0080] Marquardt 106 (Ingredient name: Dimethyldiallylammonium chloride polymer, manufactured by Lubrizol Nippon Co., Ltd., Viscosity at 25°C with solids content of 30% to 36% by mass: 20 mPa·s to 65 mPa·s, Weight-average molecular weight: 15,000). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using rotor No. 1 spindle, and at a rate of 60 revolutions per minute.

[0081] Marcoat 280 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., solid content 39% to 43% by mass, viscosity at 25°C: 3,000 mPa·s to 6,000 mPa·s, weight-average molecular weight: 450,000, p:q = 35:65 (molar ratio) in the above general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 65 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, using a rotor with spindle No. 4, and operating at 60 revolutions per minute.

[0082] Marquardt 295 (component name: dimethyldiallylammonium chloride-acrylic acid copolymer, manufactured by Lubrizol Nippon Co., Ltd., viscosity at 25°C with solid content of 35% to 40% by mass: 3,500 mPa·s to 9,000 mPa·s, weight-average molecular weight: 190,000, p:q = 5:95 (molar ratio) in the above general formula (1), molar ratio of structural units derived from dimethyldiallylammonium chloride is 95 mol). The viscosity can be measured using a Brookfield viscometer LVF (manufactured by Brookfield Corporation) at 25°C, with a rotor of spindle No. 4, and under conditions of 30 revolutions per minute.

[0083] The content of the cationic polymer is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose. However, it is preferably 0.1% by mass or more and 1% by mass or less, and more preferably 0.1% by mass or more and 0.8% by mass or less, based on the total mass of the liquid skin cleansing composition.

[0084] -Oil- The aforementioned oils are not particularly limited and can be appropriately selected depending on the purpose. Examples include vegetable oils and their ester compounds, animal oils, waxes, hydrocarbons, natural or synthetic fatty acids, and esters. These may be used individually or in combination of two or more.

[0085] Examples of the aforementioned vegetable oils and their ester compounds include castor oil, olive oil, cocoa oil, hydrogenated palm oil, camellia oil, coconut oil, wood wax, jojoba oil, grapeseed oil, and avocado oil.

[0086] Examples of the aforementioned animal fats and oils include mink oil and egg yolk oil.

[0087] Examples of the aforementioned waxes include beeswax, whalebone, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax.

[0088] Examples of the aforementioned hydrocarbons include liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum.

[0089] Examples of the aforementioned natural or synthetic fatty acids include oleic acid, isostearic acid, and behenic acid.

[0090] Examples of the aforementioned esters include glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate.

[0091] The oil content is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 3% by mass or less based on the total mass of the liquid skin cleansing composition.

[0092] -Alcoholic beverages- The aforementioned alcohols may be lower alcohols or higher alcohols. Examples of such alcohols include natural or synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, and lauryl alcohol. These may be used individually or in combination of two or more.

[0093] The amount of alcohols is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 10% by mass or less based on the total mass of the liquid skin cleansing composition.

[0094] - Amino acids - The aforementioned amino acids are not particularly limited and can be appropriately selected depending on the purpose. Examples include glycine, alanine, valine, leucine, isoleucine, phenylalanine, tryptophan, cystine, cysteine, methionine, proline, hydroxyproline, aspartic acid, glutamic acid, arginine, histidine, lysine, or derivatives thereof. These may be used individually or in combination of two or more.

[0095] The content of the amino acids is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total mass of the liquid skin cleansing composition.

[0096] -Pharmaceuticals- Examples of the aforementioned drugs include vitamins. There are no particular restrictions on the vitamins, and they can be appropriately selected depending on the purpose. Examples include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, orotic acid, or derivatives thereof. These may be used individually or in combination of two or more.

[0097] The amount of vitamins mentioned above is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.001% by mass or more and 0.5% by mass or less based on the total mass of the liquid skin cleansing composition.

[0098] -Moisturizer- The aforementioned humectant is not particularly limited and can be appropriately selected depending on the purpose. Examples include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, and polyglycerins. These may be used individually or in combination of two or more.

[0099] - Preservatives - The aforementioned preservatives are not particularly limited and can be appropriately selected depending on the purpose. Examples include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone / methylisothiazolinone solution (product name: Kayson CG, manufactured by Rohm & Haas Japan), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used individually or in combination of two or more.

[0100] The amount of the preservative is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected according to the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total mass of the liquid skin cleansing composition.

[0101] - pH adjuster - There are no particular restrictions on the pH adjusting agent, and it can be appropriately selected depending on the purpose. Examples include alkaline agents such as sodium hydroxide, potassium hydroxide, triethanolamine, aqueous ammonia, and triisopropanolamine; and acidifying agents such as citric acid, succinic acid, phosphoric acid, glycolic acid, and hydrochloric acid. These may be used individually or in combination of two or more.

[0102] -Antioxidant- The aforementioned antioxidant is not particularly limited and can be appropriately selected depending on the purpose. Examples include dibutylhydroxytoluene, butylhydroxyanisole, and ascorbic acid. These may be used individually or in combination of two or more.

[0103] The content of the antioxidant is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total mass of the liquid skin cleansing composition.

[0104] - UV absorbers and UV scatterers - The ultraviolet absorber and ultraviolet scattering agent are not particularly limited and can be appropriately selected depending on the purpose. Examples include 2-hydroxy-4-methoxybenzophenone, octyldimethyl p-aminobenzoate, ethylhexyl p-methoxycinnamate, titanium dioxide, kaolin, and talc. These may be used individually or in combination of two or more.

[0105] -Chelating agents other than component (B)- The chelating agent is not limited to any chelating agent other than component (B) mentioned above, and can be appropriately selected according to the purpose. Examples include hexametaphosphate and gluconic acid. These may be used individually or in combination of two or more.

[0106] The content of the chelating agent is not particularly limited as long as it does not impair the effects of the present invention, and can be appropriately selected depending on the purpose, but it is preferably 0.1% by mass or more and 1% by mass or less based on the total mass of the liquid skin cleansing composition.

[0107] -Fragrance- There are no particular restrictions on the aforementioned fragrances, and they can be appropriately selected according to the purpose. For example, fragrance compositions A to D described in paragraphs

[0065] to

[0071] of Japanese Patent Publication No. 2002-128658, fragrance compositions A to E described in paragraphs

[0076] to

[0088] of Japanese Patent Publication No. 2003-73249, or blended fragrance compositions 1 to 4 described in paragraphs

[0016] to

[0023] of Japanese Patent Publication No. 2020-132680 can be used.

[0108] [pH] The pH of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose, but it is preferably 9.5 to 11.0 and more preferably 9.8 to 10.6.

[0109] The aforementioned pH can be measured, for example, using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by Toa DKK Corporation, electrode type: GST-5721).

[0110] [viscosity] The viscosity of the liquid skin cleansing composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of good foaming and dispensing from the container, a viscosity of 5 mPa·s to 30 mPa·s is preferred, and a viscosity of 15 mPa·s to 25 mPa·s is more preferred.

[0111] There are no particular limitations on the method for measuring the viscosity of the liquid skin cleansing agent composition, but one example is to use a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) and measure the viscosity after 1 minute with a sample temperature of 25°C, a rotation speed of 60 rpm, and rotor No. 1.

[0112] [Former container] The liquid skin cleansing composition is preferably used by filling it into a foaming container. By filling the liquid skin cleansing composition into a foaming container, the liquid skin cleansing composition can be dispensed from the foaming container in a foamy form. In this specification, "foaming container" may be simply referred to as "container".

[0113] There are no particular restrictions on the foaming container, and it can be appropriately selected from known foaming containers, such as a non-gas foaming container and an aerosol container using a propellant and a pressure-resistant container. Among these, a non-gas foaming container is preferred as the foaming container.

[0114] The non-gas foam dispensing container is not particularly limited as long as it can dispense the liquid skin cleansing agent composition in a foamed state by mixing it with air, and can be appropriately selected according to the purpose. Examples include a squeeze foamer container that can dispense foam by squeezing the bottle body by hand, and a foamer container with a pump dispenser that can dispense foam by pressing down the nozzle. Such foamer containers can be manufactured by companies such as Yamato Seikan Co., Ltd. and Yoshino Kogyosho Co., Ltd. More specifically, foamer containers described in Japanese Patent Publication No. 7-315463, Japanese Patent Publication No. 8-230961, Japanese Patent Publication No. 2005-193972, etc., can be used.

[0115] The non-gas foam dispensing container typically has a porous membrane for forming foam, and foam is formed when the liquid skin cleansing composition passes through the porous membrane. There are no particular restrictions on the material of the porous membrane, and it can be appropriately selected depending on the purpose, but plastic materials such as nylon, polyester, and polyolefin are preferred.

[0116] There are no particular restrictions on the mesh of the porous membrane, and it can be appropriately selected according to the purpose, but 100 mesh or more is preferred, 100 mesh or more and 400 mesh or less is more preferred, and 200 mesh or more and 305 mesh or less is even more preferred.

[0117] Furthermore, there are no particular restrictions on the number of porous membranes, and they can be appropriately selected according to the purpose, but from the viewpoint of improving foam performance, 2 to 4 membranes are preferred.

[0118] For example, when using the liquid skin cleansing composition with a pump-former container described later, which has one 305-mesh porous membrane and one 200-mesh porous membrane, the viscosity of the liquid skin cleansing composition at 25°C is preferably 30 mPa·s or less, and more preferably 25 mPa·s or less.

[0119] [Manufacturing method] There are no particular limitations on the method for producing the liquid skin cleansing agent composition, and it can be appropriately selected according to the purpose. It can be obtained by mixing component (A), component (B), and component (C), and optionally the other components, and purified water (added as a remainder so that the total amount of the liquid skin cleansing agent composition is 100% by mass).

[0120] Specifically, it can be produced by dissolving component (A), component (B), and component (C) in purified water heated to 70°C to 80°C, and then cooling it to 40°C or below. If necessary, when dissolving component (A), component (B), and component (C), and if further necessary, after cooling to 40°C or below, the pH may be adjusted to the desired level with a pH adjusting agent.

[0121] The liquid skin cleansing composition may be prepared using an apparatus. The apparatus is not particularly limited and can be appropriately selected depending on the purpose. Examples include a stirring device equipped with stirring blades that have shear force and can mix the entire mixture. The stirring blades are not particularly limited and can be appropriately selected depending on the purpose. Examples include propellers, turbines, dispersers, etc.

[0122] [Application] There are no particular restrictions on the site or method of use of the liquid skin cleansing composition, and it can be appropriately selected according to the purpose. For example, it can be used on the whole body, face, hands, etc., in the usual manner.

[0123] There are no particular restrictions on the use of the aforementioned liquid skin cleansing composition, and it can be appropriately selected according to the purpose. Examples include body shampoo, body soap, facial cleanser, hand soap (liquid hand soap, foaming hand soap, etc.), cleansing foam, and makeup remover.

[0124] The aforementioned liquid skin cleansing composition exhibits high cleansing performance against color stains from makeup cosmetics such as foundation and lipstick. Therefore, it is suitable for use in cleansing foams, makeup removers, and the like. [Examples]

[0125] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited in any way to these examples and comparative examples. In the examples and comparative examples, unless otherwise specified, "%" indicates "mass%", the total amount is 100 mass%, and all values ​​are converted to pure content. However, in Tables 1 to 5, the potassium hydroxide, which is a common component, is shown as the content of "48% potassium hydroxide aqueous solution".

[0126] (Examples 1-18 and Comparative Examples 1-5) Liquid skin cleansing compositions with the compositions and content described in Examples 1-18 and Comparative Examples 1-5 shown in Tables 1-5 were prepared according to the following method. Specifically, purified water, a common component, was heated to 70°C-80°C in an amount equivalent to 60% by mass of the total volume of the final liquid skin cleansing composition. A mixture was then prepared by dissolving the anionic surfactant (component A), the chelating agent (component B), the alkylaminocarboxylic acid type amphoteric surfactant (component C), and a 48% potassium hydroxide aqueous solution, a common component. Next, the mixture was cooled to 40°C or below. If the pH was below the specified level, the 48% potassium hydroxide aqueous solution, a common component, was added to adjust the pH to 10. Then, purified water was added to bring the total volume to 100% by mass, obtaining the liquid skin cleansing compositions of Examples 1-18 and Comparative Examples 1-5.

[0127] The components were mixed using a propeller as a stirring blade and a 3-One motor (HEiDON BL1200, manufactured by Shinto Chemical Co., Ltd.). The pH was measured at 25°C using a pH meter (HM-30R, manufactured by Toa DKK Co., Ltd.). The resulting liquid skin cleansing compositions for Examples 1-18 and Comparative Examples 1-5 were filled into containers with foam pump dispensers (discharge rate: approximately 1g / push, manufactured by Yoshino Kogyosho Co., Ltd.).

[0128] For each liquid skin cleansing composition in Examples 1-18 and Comparative Examples 1-5, the following were evaluated and judged using the methods described below: "color transfer of dirt to foam," "lathering," "foam retention," "refreshing feeling after rinsing," "absence of slipperiness after rinsing," and "absence of dryness after towel drying." The results are shown in Tables 1-5.

[0129] <Color transfer to dirt foam> Ten expert evaluators applied 0.05g of liquid foundation to their fingertips, then took one pump (approximately 1g) of each liquid skin cleansing composition into their hands and rubbed their palms back and forth 10 times. They visually observed the color transfer of dirt to the foam and evaluated it based on the following evaluation criteria. The average of the scores from the ten expert evaluators based on the following evaluation criteria was calculated. The judgment result was determined based on the average of the calculated scores according to the following judgment criteria. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 5 points: The color has transferred to the foam quite a bit. 4 points: The color has transferred to the foam. 3 points: The color has slightly transferred to the foam. 2 points: Almost no color has transferred to the foam. 1 point: The color has not transferred to the foam. -Judgment criteria- ◎: The average score is between 4.5 and 5.0 points. ○: The average score is between 3.5 and 4.5 points. △: The average score is between 2.5 and 3.5 points. ×: The average score is less than 2.5 points.

[0130] <Foaming> Ten expert evaluators took one pump (approximately 1g) of each liquid skin cleansing composition into their hands and visually observed the lathering when rubbing their palms back and forth 10 times, evaluating them based on the following evaluation criteria. The average of the scores from the ten expert evaluators based on the following evaluation criteria was calculated. The judgment result was determined based on the average of the calculated scores according to the following judgment criteria. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 5 points: Very foamy 4 points: Foamy 3 points: Slightly foamy 2 points: It hardly foams up. 1 point: Not foaming -Judgment criteria- ◎: Average score is between 4.0 and 5.0 points. ○: The average score is between 3.0 and 4.0 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

[0131] <Foam retention> Ten expert evaluators took one pump (approximately 1g) of each liquid skin cleansing composition into their hands and visually observed the foam retention when rubbing their palms five times and the backs of their hands ten times at a rate of once per second, and evaluated the composition based on the evaluation criteria below. In the evaluation criteria below, "100%" of the hand area means that the foam completely covers both the palms and backs of both hands. The average of the scores from the ten expert evaluators based on the evaluation criteria below was calculated. The judgment result was determined based on the average of the calculated scores according to the judgment criteria below. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 4 points: The foam covers between 80% and 100% of the hand's surface area. 3 points: The foam covers between 50% and 80% of the hand's surface area. 2. The foam covers between 30% and 50% of the hand's surface area. 1 point: The foam covers less than 30% of the hand's surface area. -Judgment criteria- ◎: The average score is between 3.5 and 4.0 points. ○: The average score is between 3.0 and 3.5 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

[0132] Ten expert evaluators took two pumps (approximately 2g) of each liquid skin cleansing composition into their hands, rubbed their palms together 10 times to create a lather, and then rinsed their hands at a rate of one back-and-forth motion per second. They then evaluated the refreshing feeling after rinsing based on the following evaluation criteria. The average score of the ten expert evaluators based on the following evaluation criteria was calculated. The judgment result was determined based on the average score according to the following criteria. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 5 points: Very refreshing 4 points: Refreshing 3 points: Slightly bland 2 points: Not very refreshing. 1 point: Not refreshing. -Judgment criteria- ◎: Average score is between 4.0 and 5.0 points. ○: The average score is between 3.0 and 4.0 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

[0133] <No slimy feeling after rinsing> Ten expert evaluators took two pumps (approximately 2g) of each liquid skin cleanser composition into their hands, rubbed their palms together 10 times to create a lather, and then rinsed their hands at a rate of one back-and-forth motion per second. They then evaluated the slippery feeling after rinsing based on the following evaluation criteria. The average score of the ten expert evaluators based on the following evaluation criteria was calculated. The judgment result was determined based on the average score according to the following criteria. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 5 points: No sliminess at all. 4 points: Slightly sticky 3 points: Feels slightly slimy. 2 points: It feels slimy. 1 point: It feels very slimy. -Judgment criteria- ◎: Average score is between 4.0 and 5.0 points. ○: The average score is between 3.0 and 4.0 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

[0134] <No feeling of dryness after towel-drying> Ten expert evaluators took two pumps (approximately 2g) of each liquid skin cleansing composition into their hands, rubbed their palms together 10 times to create a lather, rinsed at a rate of one back-and-forth motion per second, and then towel-dried their hands. They then evaluated the dryness of the skin afterward based on the following evaluation criteria. The average score of the ten expert evaluators based on the following evaluation criteria was calculated. The judgment result was determined based on the average score according to the following criteria. A judgment result of ◎, ○, or △ indicates that there are no practical problems. - Scoring and Evaluation Criteria - 5 points: I don't feel any dryness at all. 4 points: Slightly feels dry. 3 points: Slightly dry to the touch. 2 points: I feel dryness. 1 point: I feel very dry. -Judgment criteria- ◎: Average score is between 4.0 and 5.0 points. ○: The average score is between 3.0 and 4.0 points. △: The average score is between 2.0 and 3.0 points. ×: The average score is less than 2.0 points.

[0135] [Table 1]

[0136] [Table 2]

[0137] [Table 3]

[0138] [Table 4]

[0139] [Table 5]

[0140] Details of each component used in Examples 1-18 and Comparative Examples 1-5 are as follows.

[0141] [(A) component] • Potassium laurate: Potassium laurate was prepared by neutralizing lauric acid (NAA-122, manufactured by NOF Corporation) with potassium hydroxide (48% solution) (liquid caustic potash, manufactured by AGC Inc.). • Potassium myristate: Potassium myristate was prepared by neutralizing myristic acid (NAA-142, manufactured by NOF Corporation) with potassium hydroxide (48% solution) (liquid caustic potash, manufactured by AGC Inc.). • Potassium palmitate: Potassium palmitate was prepared by neutralizing palmitic acid (NAA-160, manufactured by NOF Corporation) with potassium hydroxide (48% solution) (liquid caustic potash, manufactured by AGC Inc.). • Sodium polyoxyethylene lauryl ether acetate (average number of moles added to EO = 4.5) ... Product name: Kao Akipo RLM-45NV (manufactured by Kao Corporation)

[0142] [(B) Component] • EDTA… Product name: Disolvin® Z (manufactured by Nurion Japan Co., Ltd.)

[0143] [(C) component] • Sodium laurylaminopropionate… Product name: Levon APL (manufactured by Sanyo Chemical Industries, Ltd.) • Sodium laurylaminodipropionate… Product name: Delifat 160C (manufactured by BASF)

[0144] [Common ingredients] • Potassium hydroxide (48% solution) ... Product name: Liquid Potassium (manufactured by AGC Inc.) • Purified water… Product name: Purified water (manufactured by Kosakai Pharmaceutical Co., Ltd.)

[0145] As described above, the present invention has been explained based on specific embodiments and examples. However, these embodiments and examples are merely presented as examples, and the present invention is not limited to the above embodiments and examples. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, additions, modifications, etc., are possible without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Industrial applicability]

[0146] The liquid skin cleansing composition of the present invention is excellent in lathering, foam retention, and color transfer of dirt to the foam, leaves no sticky feeling after rinsing, provides a refreshing feeling after rinsing, and does not leave a dry feeling after towel drying. Therefore, it can be suitably used in body shampoos, body soaps, facial cleansers, hand soaps (liquid hand soaps, foaming hand soaps, etc.), cleansing foams, makeup removers, and the like.

Claims

1. (A) Anionic surfactants, (B) Chelating agent, (C) Alkylaminocarboxylic acid type amphoteric surfactant, It contains, A liquid skin cleansing composition characterized in that the mass ratio [(B) / (C)] of the mass of component (C) to the mass of component (B) is 0.60 or more and 5.00 or less.

2. The content of component (A) is 3% by mass or more and 7% by mass or less, The content of component (B) is 0.3% by mass or more and 1.7% by mass or less. The content of component (C) is 0.4% by mass or more and 4.5% by mass or less. The liquid skin cleansing composition according to claim 1.

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