Body cleansing agent composition

Abstract

This invention provides a body cleansing composition that produces good lather even when using hard water, suppresses tightness in the skin after washing, leaves the skin feeling moisturized, and has excellent low-temperature stability. [Solution] The detergent composition contains predetermined amounts of component (A), which is an N-acylic acid type anionic surfactant of a specific structure; component (B), which is an anionic surfactant other than component (A); component (C), which is an amphoteric surfactant; and component (D), which is a compound and / or a salt thereof of a specific structure. In the detergent composition, the mass ratio (A) / (B) is 0.5 to 10.0, the mass ratio {(A)+(B)} / (C) is 0.5 to 10.0, and the mass ratio (A) / (D) is 15 to 300.

Description

[Technical Field]

[0001] This invention relates to body cleansing compositions such as body soap, hand soap, and facial cleanser. [Background technology]

[0002] Traditionally, various fatty acid salts, which offer excellent lathering and cleansing properties, have been widely used in body cleansing compositions such as body soaps, hand soaps, and facial cleansers. However, while fatty acid salts have high cleansing power, they also remove the skin's moisturizing components. As a result, these products have the problem of leaving the skin feeling dry after washing. Furthermore, when using hard water, fatty acid salts form salts with calcium and magnesium ions, leading to reduced lathering and a feeling of tightness on the skin.

[0003] To address these problems, the use of acyl amino acid-based anionic surfactants, which are gentle cleansing ingredients for the skin, has been proposed. For example, Patent Document 1 discloses a liquid cleansing composition combining an N-acyl amino acid-type anionic surfactant, an amphoteric surfactant, and polyethylene glycol. Patent Document 2 also discloses a skin cleansing composition combining a fatty acid salt and an N-long-chain acyl acidic amino acid arginine salt. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2009-120546 [Patent Document 2] Japanese Patent Publication No. 2008-94725 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, while the aforementioned cleansing compositions can reduce the burden on the skin, they do not provide sufficient lathering. For example, the cleanser in Patent Document 1 is excellent in its mildness on the skin and suppresses the feeling of tightness after washing, but it sometimes lacks lathering ability. Also, according to the composition described in Patent Document 2, the skin is washed moist without stripping away its moisturizing components, and the feeling of tightness is suppressed. N-long-chain acyl-acid amino acid type anionic surfactants, such as N-long-chain acyl-acid amino acid arginine salts, can reduce the burden on the skin. On the other hand, when using hard water containing calcium ions and magnesium ions, the cleanser in Patent Document 2, which mainly contains fatty acids and N-long-chain acyl-acid amino acid type anionic surfactants, tends to form salts with these metal ions, resulting in reduced lathering in hard water.

[0006] Furthermore, it is preferable that the detergent composition has a formulation that can be used regardless of the storage temperature in each region. On the other hand, preservatives, fragrances, oils, etc., in the detergent composition are necessary for the safe use of the product and for a good user experience. However, these are in the form of powders or oil-soluble components. Therefore, clouding and precipitation sometimes occur, especially during low-temperature storage.

[0007] Therefore, there is a need for a body cleansing composition that can produce good lather even when using hard water, suppress or eliminate tightness in the skin after washing, leave the skin feeling moisturized, and also exhibit excellent low-temperature stability.

[0008] The present invention aims to solve the above problems and to provide a body cleansing composition that provides good lathering even when using hard water, suppresses or eliminates the feeling of tightness in the skin after washing, leaves the skin feeling moisturized, and has excellent low-temperature stability. [Means for solving the problem]

[0009] In view of the above problems, the inventors conducted diligent studies and found that the above problems can be solved by combining components (A) to (D) of a specific structure in a specific mass ratio, thus completing the present invention.

[0010] In other words, the present invention provides the following body cleansing compositions. A body cleansing composition comprising: 1.0% by mass or more and 20.0% by mass or less of component (A) represented by the following formula (1); 0.1% by mass or more and 10.0% by mass or less of component (B) which is an anionic surfactant other than component (A); 1.0% by mass or more and 20.0% by mass or less of component (C) which is an amphoteric interface; and 0.005% by mass or more and 2.5% by mass or less of component (D) which is a compound and / or a salt thereof represented by the following formula (2), wherein the mass ratio of component (A) to component (B) ((A) / (B)) is 0.5 or more and 10.0 or less, the mass ratio of the sum of components (A) and (B) to component (C) ({(A)+(B)} / (C)) is 0.5 or more and 10.0 or less, and the mass ratio of component (A) to component (D) ((A) / (D)) is 15 or more and 300 or less. [ka] (In formula (1), R 1 CO represents a linear or branched saturated or unsaturated fatty acid acyl group with 8 to 22 carbon atoms, and R 2 (wherein ∫ represents a hydrogen atom, a linear or branched alkyl group having 1 to 4 carbon atoms, or a linear or branched alkylene group having 1 to 4 carbon atoms and one OH group; M represents an alkali metal, a 1 / 2 alkaline earth metal, or an organic ammonium compound.) [ka] (In formula (2), R 3 (This represents a hydrogen atom, or a linear or branched alkyl group having 1 to 4 carbon atoms.) [Effects of the Invention]

[0011] The body cleansing composition of the present invention (hereinafter, also simply referred to as "cleansing composition") can obtain good foaming even when using hard water, can suppress or eliminate the tight feeling of the skin after washing, gives the skin a moist feeling, and is a body cleansing composition excellent in low-temperature stability. In addition, the "hard water" in this specification refers to water with an American hardness of 120 ppm or more.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the embodiments described in this specification, and various modifications can be made without departing from the gist of the present invention.

[0013] In addition, the numerical range defined using the symbol "~" in this specification shall include the numerical values at both ends (upper limit and lower limit) of "~". For example, "2~5" represents 2 or more and 5 or less. Also, in the numerical range described in this specification, the upper limit value or lower limit value of the numerical range can be replaced with the value shown in the examples or the value uniquely derived from the examples.

[0014] The cleansing composition of the present invention contains at least component (A), component (B), component (C), and component (D). Hereinafter, each component will be described. In addition, the content of each component in this specification is the content when the total amount of the cleansing composition of the present invention is 100% by mass. Further, when there are multiple substances corresponding to each component in the composition, the content of each component in the composition means the total content of the multiple substances present in the composition.

[0015] 〔Component (A)〕 Component (A) is a compound represented by the following formula (1) and is an N-acyl amino acid type anionic surfactant. The cleansing composition may contain only one of these or two or more of them.

Chemical formula

[0016] Specific examples of aliphatic acyl groups having 8 to 22 carbon atoms include capryloyl group (8 carbon atoms), caproyl group (10 carbon atoms), lauroyl group (12 carbon atoms), myristoyl group (14 carbon atoms), palmitoyl group (16 carbon atoms), stearoyl group (18 carbon atoms), oleoyl group (18 carbon atoms), and behenyl group (22 carbon atoms). The aliphatic acyl group is preferably a lauroyl group, a myristoyl group, a coconut oil fatty acid acyl group containing a large amount of these, and a palm kernel oil fatty acid acyl group, and more preferably a lauroyl group, a coconut oil fatty acid acyl group, and a palm kernel oil fatty acid acyl group.

[0017] R in equation (1) 2 This represents a hydrogen atom, a linear or branched alkyl group having 1 to 4 carbon atoms, or a linear or branched alkylene group having 1 to 4 carbon atoms and having one OH group.

[0018] Examples of linear or branched alkyl groups having 1 to 4 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, i-butyl, and t-butyl groups. Examples of linear or branched alkylene groups having 1 to 4 carbon atoms include methylene, ethylene, n-propylene, isopropylene, n-butylene, and isobutylene groups. Specifically, examples of linear or branched alkylene groups having 1 to 4 carbon atoms and possessing one OH group include monohydroxyethyl, monohydroxypropyl, monohydroxyisopropyl, monohydroxybutyl, and 2-hydroxybutyl groups. 2 Among the above, the preferred members are a hydrogen atom, a methyl group, an ethyl group, a monohydroxyethyl group, and a monohydroxypropyl group, and more preferably, hydrogen and a methyl group.

[0019] In formula (1), M represents an alkali metal, a 1 / 2 alkaline earth metal, or an organic ammonium. Examples of alkali metals include sodium and potassium. Examples of alkaline earth metals include magnesium and calcium. Examples of organic ammonium include monoethanolammonium, diethanolammonium, and triethanolammonium. M is preferably sodium, potassium, and triethanolammonium, and more preferably sodium. The notation 1 / 2 in "1 / 2 alkaline earth metal" represents a coefficient used to make the valence (divalent) of the alkaline earth metal monovalent when it becomes a cation.

[0020] Specific examples of component (A), i.e., surfactants represented by formula (1), include N-lauroyl-β-alanine sodium, N-coconut oil fatty acid-β-alanine sodium, N-lauroyl-N-methyl-β-alanine sodium, N-lauroyl-N-methyl-β-alanine triethanolamine, N-coconut oil fatty acid acyl-N-methyl-β-alanine sodium, N-lauroyl-N-ethyl-β-alanine sodium, N-lauroyl-N-hydroxyethyl-β-alanine sodium, N-lauroyl-N-hydroxyethyl-β-alanine triethanolamine, N-lauroyl-N-hydroxypropyl-β-alanine triethanolamine, and N-coconut oil fatty acid acyl-N-hydroxyethyl-β-alanine sodium.

[0021] Among these, N-lauroyl-N-methyl-β-alanine sodium, N-lauroyl-N-methyl-β-alaninetriethanolamine, N-coconut oil fatty acid-β-alanine sodium, N-lauroyl-N-hydroxyethyl-β-alanine sodium, and N-lauroyl-N-hydroxyethyl-β-alaninetriethanolamine are preferred, with N-lauroyl-N-methyl-β-alanine sodium and N-lauroyl-N-hydroxyethyl-β-alanine sodium being particularly preferred.

[0022] When the total amount of the detergent composition of the present invention is 100% by mass, the content of component (A) (total amount if multiple compounds are included) may be 1.0 to 20.0% by mass, preferably 4.0 to 15.0% by mass, and more preferably 5.0 to 10.0% by mass. If the content of component (A) is too low, foaming may decrease when using hard water, and low-temperature stability may be poor. However, if the content of component (A) is 1.0% by mass or more, foaming will be good when using hard water, and low-temperature stability will be good. On the other hand, if the content of component (A) is too high, a feeling of tightness may occur on the skin after washing. However, if the content of component (A) is 20.0% by mass or less, a feeling of tightness is less likely to occur.

[0023] [Component (B)] Component (B) is an anionic surfactant other than component (A). Examples of such anionic surfactants include alkyl sulfate esters, polyoxyethylene alkyl ether sulfates, alkyl amide ether sulfates, polyoxyethylene alkyl amide ether sulfates, polyoxyethylene alkyl ether acetates, alkyl phosphates, polyoxyethylene alkyl ether phosphates, α-olefin sulfonates, higher fatty acid salts, N-acyl amino acid salts other than component (A), N-acyl isethionates, N-acyl methyl taurates, N-acyl polypeptide salts, alkyl sulfosuccinates, and the like. Among these, polyoxyethylene alkyl ether sulfates, N-acyl methyl taurates, and N-acyl amino acid salts other than component (A) are preferred, and N-acyl methyl taurates are more preferred. The detergent composition may contain only one of these or two or more of them.

[0024] The above polyoxyethylene alkyl ether sulfate is, for example, a compound represented by the following formula (3). R 4 -O-(CH2CH2O) x -SO3M 2 ···(3) In the above formula (3), R 4 represents a linear or branched alkyl group having 8 to 22 carbon atoms, and preferably has 8 to 18 carbon atoms from the viewpoint of foaming. Also, in the above formula (3), M 2 represents an alkali metal, 1 / 2 alkaline earth metal, organic ammonium, or amino acid salt. Specific examples of alkali metals, 1 / 2 alkaline earth metals, and organic ammonium are the same as the specific examples of M in the above formula (1). Examples of amino acid salts include sodium taurine and the like. Further, x in the above formula (3) represents an integer of 1 to 30, and preferably 1 to 5. Specific examples of these include sodium POE(2) lauryl ether sulfate, sodium POE(3) lauryl ether sulfate, and the like.

[0025] The number of carbon atoms in the acyl group in N-acylmethyltaurine salt is preferably 8 to 22, and preferably 8 to 18 from the viewpoint of foaming. The acyl group is R in formula (1) above. 1 Similar to CO, preferably a lauroyl group or a myristoyl group, and even more preferably a coconut oil fatty acid acyl group or palm kernel oil fatty acid acyl group containing these, and more preferably a lauroyl group, a coconut oil fatty acid acyl group, or a palm kernel oil fatty acid acyl group. Furthermore, examples of counterions for N-acylmethyltaurine include alkali metals, 1 / 2 alkaline earth metals, organic ammonium compounds, and amino acid salts. Specific examples of these are shown in M ​​in formula (3) above. 2 This is similar to the specific examples. Specific examples of N-acylmethyltaurate salts include sodium N-coconut oil fatty acid acyl-N-methyltaurate, sodium N-coconut oil fatty acid acyl-N-methyltaurate, sodium stearoylmethyltaurate, sodium lauroylmethyltaurate, and sodium myristoylmethyltaurate.

[0026] Furthermore, the number of carbon atoms in the acyl group of the N-acyl amino acid salt other than component (A) described above is preferably 8 to 22, and preferably 8 to 18 carbon atoms from the viewpoint of foaming. The acyl group is R in formula (1) described above. 1 Similar to CO, preferably a lauroyl group or a myristoyl group, and even more preferably a coconut oil fatty acid acyl group or a palm kernel oil fatty acid acyl group containing these, and more preferably a lauroyl group, a coconut oil fatty acid acyl group, or a palm kernel oil fatty acid acyl group. Examples of amino acids that form N-acyl amino acid salts include valine, leucine, isoleucine, histidine, lysine, methionine, phenylalanine, threonine, tryptophan, asparagine, aspartic acid, arginine, cysteine, glutamine, glutamic acid, glycine, proline, serine, tyrosine, N-methylglycine, and taurine, with N-methylglycine and glutamic acid being preferred. Examples of counterions for N-acylmethyl amino acid salts include alkali metals, 1 / 2 alkaline earth metals, organic ammonium compounds, and amino acid salts, and specific examples of these are shown in the above formula (3) M 2This is similar to the specific example. Specific examples of N-acyl amino acid salts other than component (A) include sodium N-lauroyl sarcosinate and sodium N-coconut oil fatty acid acyl glutamate.

[0027] The content of component (B) in the cleansing composition of the present invention (total amount if multiple compounds are included) is 0.1 to 10.0% by mass of the total composition, preferably 1.0 to 8.0% by mass, and more preferably 2.0 to 5.0% by mass. If the content of component (B) is too low, it may cause a feeling of tightness, but if it is 0.1% by mass or more, the feeling of tightness is well suppressed. Also, if the content of component (B) is too high, the skin may feel less moisturized after washing, or the low-temperature stability may be poor, but if it is 10.0% by mass or less, these are well suppressed.

[0028] [Component (C)] Component (C) is an amphoteric surfactant having a structure that combines cationic and anionic groups. Examples of component (C) include amphoteric surfactants having an N-acyl group or an N-alkyl group, such as alkyl betaine, alkylamide betaine, alkyl hydroxysulfobetaine, alkylamide hydroxysulfobetaine, alkylcarboxymethyl hydroxyethyl imidazolinium betaine, alkylamide hydroxyethyl amino acid type amphoteric surfactant, and alkylimino diacetate.

[0029] The N-acyl group contained in the above amphoteric surfactant represents, for example, a linear or branched saturated or unsaturated aliphatic acyl group having 8 to 18 carbon atoms. This aliphatic acyl group may be an acyl group derived from a single saturated or unsaturated fatty acid having 8 to 18 carbon atoms. Alternatively, it may be an acyl group derived from a mixed fatty acid containing two or more fatty acids. Examples of multiple acyl groups derived from mixed fatty acids include coconut oil fatty acid acyl groups, palm kernel oil fatty acid acyl groups, beef tallow fatty acid acyl groups, and hydrogenated beef tallow fatty acid acyl groups. The N-acyl group is R in formula (1) above. 1It is similar to CO. Among these, preferred are lauroyl group, myristoyl group, palmitoyl group, oleoyl group, coconut oil fatty acid acyl group, and palm kernel oil fatty acid acyl group, and more preferably lauroyl group, coconut oil fatty acid acyl group, and palm kernel oil fatty acid acyl group.

[0030] The N-alkyl groups contained in the above-mentioned amphoteric surfactants are, for example, hydrocarbon groups having 8 to 18 carbon atoms, and also include mixed alkyl groups derived from mixed fatty acids. Examples of alkyl groups include caprylyl, caprylic, lauryl, myristyl, palmityl, stearyl, and oleyl groups; and mixed alkyl groups such as coconut oil alkyl groups, palm kernel oil alkyl groups, and beef tallow alkyl groups. Among these, lauryl, myristyl, palmityl, coconut oil alkyl groups, and palm kernel oil alkyl groups are preferred, and more preferably lauryl, coconut oil alkyl groups, and palm kernel oil alkyl groups.

[0031] Specific examples of amphoteric surfactants of component (C) include, for example, lauryl betaine, coconut oil fatty acid amidopropyl betaine, palm kernel oil fatty acid amidopropyl betaine, lauryl hydroxysulfobetaine, and sodium cocoamphoacetate. Among these, lauryl betaine, coconut oil fatty acid amidopropyl betaine, palm kernel oil fatty acid amidopropyl betaine, lauryl hydroxysulfobetaine, and sodium cocoamphoacetate are preferred.

[0032] The content of component (C) in the detergent composition of the present invention (total amount if multiple compounds are included) is 1.0 to 20.0% by mass, preferably 2.0 to 12.0% by mass, and more preferably 3.0 to 10.0% by mass. If the content of component (C) is too low, lathering may decrease when using hard water, but if it is 1.0% by mass or more, lathering will be good. On the other hand, if the content of component (C) is too high, the moisturizing effect on the skin after washing may be poor, but if it is 20.0% by mass or less, the moisturizing effect will be good.

[0033] [Component (D)] Component (D) is a compound represented by the following formula (2) and / or a salt thereof. The detergent composition of the present invention may contain only one of these, or two or more. [ka]

[0034] R in equation (2) 3 The group represents a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms. Examples of linear or branched alkyl groups having 1 to 4 carbon atoms include methyl, ethyl, n-propyl, isopropyl, n-butyl, i-butyl, and t-butyl groups. Among these, a hydrogen atom, a methyl group, or an ethyl group is preferred, and a hydrogen atom or a methyl group is more preferred.

[0035] Furthermore, examples of salts of the compound of formula (2) above include sodium salt, potassium salt, magnesium salt, calcium salt, monoethanolamine salt, diethanolamine salt, triethanolamine salt, hydrochloride salt, sulfate salt, citrate salt, lactate salt, etc., but are not limited to these. Among these, sodium salt, potassium salt, triethanolamine salt, hydrochloride salt, citrate salt, malate salt, and lactate salt are preferred, and sodium salt, citrate salt, malate salt, and lactate salt are more preferred.

[0036] Specific examples of component (D) represented by formula (2) include, for example, β-alanine, N-methyl-β-alanine, N-ethyl-β-alanine, and Nt-butyl-β-alanine.

[0037] The content of component (D) in the detergent composition of the present invention is 0.005 to 2.5% by mass, preferably 0.01 to 1.0% by mass, and more preferably 0.05 to 0.3% by mass. If the content of component (D) is too low, foaming may decrease when using hard water, or low-temperature stability may be poor. However, if it is 0.005% by mass or more, foaming will be good when using hard water, and low-temperature stability will also be good. On the other hand, if the content of component (D) is too high, low-temperature stability may be poor, or a feeling of tightness may occur on the skin after washing. However, if it is 2.5% by mass or less, a feeling of tightness is less likely to occur. Furthermore, from the viewpoint of further improving foaming, if the hardness of the water used to dilute the detergent composition is less than 120 ppm, it is preferable that the content be 0.05 to 0.1% by mass, and if the hardness of the water used is 120 ppm or more, it is preferable that it be 0.1 to 0.3% by mass.

[0038] [Quantitative relationship between component (A) to component (D)] The mass ratio ((A) / (B)) of component (A) to component (B) in the cleansing composition of the present invention is 0.5 to 10.0, preferably 0.6 to 7.0, more preferably 0.8 to 6.0, and particularly preferably 1.0 to 5.0. If the above mass ratio ((A) / (B)) is too small, low-temperature stability may be poor, but it is good when it is 0.5 or higher. On the other hand, if the mass ratio ((A) / (B)) is too large, it may cause a feeling of tightness in the skin after cleansing, but if it is 10.0 or lower, it is less likely to cause a feeling of tightness.

[0039] Furthermore, the mass ratio ({(A)+(B)} / (C)) of the total of components (A) and (B) to component (C) in the detergent composition of the present invention is 0.5 to 10.0, preferably 0.6 to 8.0, more preferably 0.8 to 6.0, and particularly preferably 1.0 to 4.0. If the above mass ratio ({(A)+(B)} / (C)) is too small, foaming in hard water may decrease, but if it is 0.5 or higher, foaming will be good. On the other hand, if the above mass ratio ({(A)+(B)} / (C)) is too large, the moisturizing effect on the skin after washing may be poor, or the low-temperature stability may be poor, but if it is 10.0 or lower, these will be good.

[0040] Furthermore, the mass ratio ((A) / (D)) of component (A) to component (D) in the detergent composition of the present invention is 15 to 300, preferably 20 to 190, more preferably 30 to 170, and particularly preferably 40 to 150. If the mass ratio ((A) / (D)) is too small, foaming may decrease when using hard water, and low-temperature stability may decrease, but these are improved when it is 15 or higher. If the mass ratio ((A) / (D)) is too large, a feeling of tightness may occur on the skin after washing, but if it is 300 or less, it is less likely to cause a feeling of tightness.

[0041] 〔water〕 The detergent composition of the present invention typically contains water in addition to the above components (A) to (D). Examples of water include purified water such as distilled water or ion-exchanged water, and tap water. Among these, purified water such as distilled water or ion-exchanged water is preferred.

[0042] The water content in the detergent composition of the present invention is preferably 55.0 to 95.0% by mass, more preferably 60 to 90% by mass, and particularly preferably 65.0 to 85.0% by mass. The total content of the above components (A) to (D) and water in the detergent composition is preferably 80% by mass or more, more preferably 85.0% by mass or more, and particularly preferably 90.0% by mass or more.

[0043] [Other optional ingredients] The detergent composition of the present invention may further contain other optional components in addition to the above components (A) to (D) and water, as long as the effects of the invention are not impaired.

[0044] Other optional ingredients include, for example, oils and fats such as vegetable oils and animal oils; hydrocarbon oils such as squalane, liquid paraffin, and hydrogenated polyisobutene; higher alcohols such as cetyl alcohol, stearyl alcohol, and cetostearyl alcohol; silicones such as cyclic silicones, dimethylpolysiloxane, and amino-modified polysiloxane; ester oils such as 2-ethylhexyl palmitate, caprylic / capric triglyceride, and isopropyl myristate; cationic surfactants such as stearyltrimethylammonium chloride, benzalkonium chloride, and cocoyl arginine ethyl PCA; polyoxyethylene alkyl ethers, polyglycerin fatty acid esters, polyoxyethylene glycerin fatty acid esters, fatty acid alkanolamides (e.g., lauric acid diethanolamide), and lipids. Nonionic surfactants such as fatty acid alkylene glycol esters (e.g., monobutylene glycol laurate); solvents such as ethanol, propylene glycol, and glycerin; preservatives such as phenoxyethanol, sodium benzoate, methylisothiazoline, methylchloroisothiazolinone, ethylhexylglycerin, 1,2-hexanediol, and hydroxyacetophenone; chelating agents such as edetate, disodium edetate, and trisodium hydroxyethylethylenediaminetriacetate; pH adjusters such as sodium hydroxide, potassium hydroxide, monoethanolamine, triethanolamine, hydrochloric acid, sulfuric acid, citric acid, succinic acid, malic acid, lactic acid, and tartaric acid; humectants such as ethylhexylglycerin, polysaccharides, amino acids, peptides, fragrances, and colorants may be included as appropriate.

[0045] The content of other optional components in the detergent composition of the present invention is preferably 20.0% by mass or less, preferably 0.1 to 15.0% by mass, and more preferably 1.0 to 10.0% by mass.

[0046] The pH of the detergent composition of the present invention is not particularly limited, but at 25°C and in its undiluted state (detergent composition), it is preferably 4.5 to 8.0, more preferably 5.0 to 7.5, and most preferably 5.5 to 7.0.

[0047] To adjust the pH of the detergent composition to the above range, a pH adjusting agent can be used, preferably citric acid, malic acid, or lactic acid, and more preferably citric acid or lactic acid. The content of the pH adjusting agent in the detergent composition is preferably 0.05 to 4% by mass, preferably 0.1 to 3% by mass, and more preferably 0.2 to 1.5% by mass. The pH of the detergent composition in this specification is the value measured using a pH meter in accordance with JIS Z8802.

[0048] [Method for producing a detergent composition] The detergent composition of the present invention can be manufactured according to known methods. For example, components (A) to (D) above and other optional components as needed are added. Then, the total volume of the composition is adjusted with water to 100% by mass. After that, the detergent composition of the present invention is obtained by heating and stirring as needed. [Examples]

[0049] The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited in any way by these examples.

[0050] [Preparing the materials] The following compounds were prepared as components (A) to (D), and other components. These are commercially available products offered for cosmetic use.

[0051] • Ingredient (A) As component (A), R in equation (1) 1 CO, R 2 Compounds (A-1) to (A-4) were prepared, in which M and , respectively, have the structures shown in Table 1 below. [ka]

[0052] [Table 1]

[0053] ·Component (B) Sodium polyoxyethylene(3) lauryl ether sulfate N-coconut oil fatty acid acyl-N-methyltaurate sodium N-lauroyl sarcosin sodium N-coconut oil fatty acid acyl glutamate sodium

[0054] ·Component (C) Coconut oil fatty acid amidopropyl betaine Lauryl hydroxysulfobetaine Sodium cocoamphoacetate

[0055] ·Component (D) N-methyl-β-alanine N-ethyl-β-alanine

[0056] Other ingredients Glycerin Propylene glycol Lauric acid diethanolamide Potassium myristate Phenoxyethanol Hydroxyacetophenone olive oil citric acid water

[0057] [Preparation of Detergent Compositions] (Examples 1-9 and Comparative Examples 1-3) Components (A), (B), (C), (D), and other components were sequentially added to water in the mass ratios shown in Tables 2 and 3, mixed, and uniformly dissolved. This prepared the body cleansing compositions of Examples 1-9 and Comparative Examples 1-3. The values ​​in Tables 2 and 3 are in mass percent. The common components in Tables 2 and 3 are the components shown in Table 4.

[0058] [evaluation] For each detergent composition of Examples 1-9 and Comparative Examples 1-3, the foaming ability, tightness, moisturizing effect, and low-temperature stability when using hard water were evaluated as described in (1)-(4) below. The results are shown in Tables 2 and 3.

[0059] (1) Foaming when using hard water Ten mL of each detergent composition from the examples and comparative examples was taken and diluted with 150 ppm hardness water at 40°C to a total volume of 50 mL. Then, 0.05 g of oleic acid was added as a dirt component model. The mixture was foamed for 5 seconds using a mill mixer (Iwatani Corporation "IFM-100") and allowed to stand for 1 minute. Next, the foam height in the mill mixer container was measured. Based on the measured foam height, the amount of foam of the detergent composition was evaluated in three stages: "◎", "○", and "×" according to the evaluation criteria below. A rating of "◎" or "○" was considered a pass. <Evaluation Criteria> ◎: Foam height of 70mm or more ○: Foam height is 60mm or more but less than 70mm ×: Bubble height less than 60mm

[0060] (2) Suppression of tightness Twenty men and women (ages 24-40) served as panelists. Each participant took 5g of the sample (cleansing agent composition) in their hand, washed their hands with water with a hardness of 150ppm and a temperature of 40°C, and then shook their hands several times to remove excess water. After washing, they evaluated the feeling of tightness in their skin. They assigned points as follows: 2 points for no tightness, 1 point for slight tightness, and 0 points for tightness. The total scores of the 20 participants were then evaluated on a four-point scale. ◎: Total score of 35 points or more ○: Total score of 30 points or more, but less than 35 points. △: Total score is 20 points or more, but less than 30 points. ×: Total score less than 20 points

[0061] (3) Moisturizing Twenty men and women (ages 24-40) served as panelists. Each participant took 5g of the sample, washed their hands with water with a hardness of 150ppm and a temperature of 40°C, and then shook their hands several times to remove excess water before evaluating the moistness of their skin. Participants were given a score of 2 for a moist feeling, 1 for a slightly moist feeling, and 0 for no moist feeling. The total scores of the 20 participants were then evaluated on a four-point scale. ◎: Total score of 35 points or more ○: Total score of 30 points or more, but less than 35 points. △: Total score is 20 points or more, but less than 30 points. ×: Total score less than 20 points

[0062] (4) Low temperature stability Each detergent composition from the examples and comparative examples was sealed in a transparent glass container and stored in a constant temperature bath at 0°C for one month. After one month of storage, the appearance of each detergent composition was visually observed and evaluated in the following three stages. <Evaluation Criteria> ○: Good stability. (No turbidity, precipitation, or separation observed) △: There is no sedimentation or separation, and the solution is clear, but slight turbidity is observed. ×: Poor stability. (Cloudiness, precipitation, and separation may be observed.)

[0063] [result] [Table 2]

[0064] [Table 3]

[0065] [Table 4]

[0066] As shown in Tables 2 and 3 above, the compositions of Examples 1 to 9 all exhibited good foaming, suppression of tightness, moisturizing effect, and low-temperature stability when using hard water. On the other hand, Comparative Example 1 lacked component (A), resulting in low foaming when using hard water and poor low-temperature stability. Comparative Example 2 lacked component (D), and the mass ratio of the sum of components (A) and (B) to component (C) ({(A)+(B)} / (C)) was greater than 10.0, resulting in poor moisturizing effect and insufficient low-temperature stability. Comparative Example 3 lacked component (B), and the mass ratio of component (A) to component (D) ((A) / (D)) was greater than 300, resulting in poor suppression of tightness.

[0067] [Preparation of Detergent Composition] (Example 10) A detergent composition was prepared by mixing each component according to the formulation (mass ratio) shown in Table 5 below, in the same manner as in Example 1 above. The total volume was adjusted to 100% by mass using purified water.

[0068] [Table 5]

[0069] In the above formulation, the mass ratio of component (A) to (B) ((A) / (B)) is 4.5, the mass ratio of the sum of (A) and component (B) to component (C) ({(A)+(B)} / (C)) is 1.8, and the mass ratio of component (A) to component (D) ((A) / (D)) is 45.

[0070] When the detergent composition of the formulation example was evaluated according to the above (1) to (4) criteria, it showed good foaming when using hard water, suppression of tightness, moisturizing effect, and low-temperature stability, thus confirming the effects of the present invention.

[0071] [Preparation of Detergent Composition] (Example 11) A detergent composition was prepared by mixing each component according to the formulation (mass ratio) shown in Table 6 below, in the same manner as in Example 1 above. The total volume was adjusted to 100% by mass using purified water.

[0072] [Table 6]

[0073] In the above formulation, the mass ratio of component (A) to (B) ((A) / (B)) is 2.3, the mass ratio of the sum of (A) and component (B) to component (C) ({(A)+(B)} / (C)) is 1.3, and the mass ratio of component (A) to component (D) ((A) / (D)) is 70.

[0074] When the detergent composition of the formulation example was evaluated according to the above (1) to (4) criteria, it showed good foaming when using hard water, suppression of tightness, moisturizing effect, and low-temperature stability, thus confirming the effects of the present invention. [Industrial applicability]

[0075] The body cleansing composition of the present invention provides good lathering even when using hard water, suppresses or eliminates tightness in the skin after washing, leaves the skin feeling moisturized, and exhibits excellent low-temperature stability. Therefore, it is extremely useful as a body cleansing composition for body soaps, hand soaps, facial cleansers, and other body cleansing products.

Claims

[Claim 1] The component (A) represented by the following formula (1) is present in an amount of 1.0% by mass or more and 20.0% by mass or less. Component (B), which is an anionic surfactant other than component (A), is present in an amount of 0.1% by mass or more and 10.0% by mass or less. The amphoteric surfactant component (C) is present in an amount of 1.0% by mass or more and 20.0% by mass or less. Component (D), which is a compound represented by the following formula (2) and / or a salt thereof, is present in an amount of 0.005% by mass or more and 2.5% by mass or less. It contains, The mass ratio ((A) / (B)) of component (A) to component (B) is 0.5 or more and 10.0 or less, and The mass ratio of the sum of the above components (A) and (B) to the above component (C) ({(A) + (B)} / (C)) is 0.5 or more and 10.0 or less, and The mass ratio ((A) / (D)) of component (A) to component (D) is 15 or more and 300 or less. Body cleansing agent composition. 【Chemistry 1】 (In formula (1), R １ CO represents a linear or branched saturated or unsaturated fatty acid acyl group with 8 to 22 carbon atoms. R ２ This represents a hydrogen atom, a linear or branched alkyl group having 1 to 4 carbon atoms, or a linear or branched alkylene group having 1 to 4 carbon atoms and one OH group. (M represents alkali metals, half alkaline earth metals, or organic ammonium compounds.) 【Chemistry 2】 (In formula (2), R ３ (This represents a hydrogen atom, or a linear or branched alkyl group having 1 to 4 carbon atoms.)

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