Amino acid type surfactant-containing body detergent composition

Abstract

To provide an amino acid type surfactant-containing body detergent composition having excellent low temperature stability and high temperature stability which has lasting fine foam when cleaning, excellent foam stability, reduced sliminess is when cleaning, and refreshing feel after cleaning.SOLUTION: An amino acid type surfactant-containing body detergent composition contains (A) potassium cocoyl β-alaninate by 0.2 to 8.0 mass%, (B) N-acylamino acid salt by 2.0 to 10.0 mass%, (C) nonionic surfactant by 0.1 to 5.0 mass%, and (D) polyol by 0.1 to 20.0 mass%, where pH of the composition is within the range of pH6.1 to pH10.0.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a body cleanser composition containing an amino acid-based surfactant, which can produce fine foam during cleansing, has excellent foam stability, reduces stickiness during cleansing, leaves skin feeling refreshed after cleansing, and has excellent low-temperature stability and high-temperature stability. [Background technology]

[0002] Amino acid surfactants have an amino acid as their main structure and are mild to the skin. Generally, fatty acid salts and amino acid surfactants are used as the main bases for body cleansers, such as facial cleansers (Non-Patent Document 1). However, when body cleansers are prepared using amino acid surfactants as the main base, they produce coarse foam, have poor foam stability, and may not cleanse completely. Furthermore, amino acid surfactants have low sensitivity to calcium and are less likely to form chelate compounds (scum) with surfactants, which can lead to a sticky feeling during cleansing and make it difficult to achieve a refreshing feeling after cleansing (Non-Patent Document 1). In contrast, when fatty acid salts are used as the main base, they are likely to produce a squeaky feeling during rinsing and are thought to provide a refreshing feel (Non-Patent Document 2), but skin irritation can be a problem.

[0003] Various approaches have been taken to improve the foaming performance of amino acid surfactant formulations. For example, Patent Document 1 improves foaming power by combining an acylmethyl taurine salt with a polyoxyethylene alkyl ether, but there is no mention of improving the refreshing feeling after cleansing. Furthermore, foam stability may be insufficient, leaving room for improvement. Patent Document 2 proposes improving foaming power and texture by combining an acylhydroxyethyl-β-alanine salt with an anionic surfactant, but the refreshing feeling on the skin after cleansing may be poor, leaving room for improvement. Patent Document 3 also proposes improving foaming power and texture on the skin after cleansing by combining an amide ether carboxylic acid or its salt with a fatty acid, but the result may be excessively refreshing, resulting in an uncomfortable feeling of tightness. Furthermore, there is no mention of low-temperature or high-temperature stability, leaving room for improvement. Furthermore, in Patent Document 4, the low-temperature stability of a detergent composition is improved by using an acyl-β-alanine salt, an amphoteric surfactant, a cationic polymer, and a specific compound, but the composition tends to be slimy and may not leave a refreshing feeling after washing, so there is still room for improvement. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2002-155295 [Patent Document 2] Patent Publication No. 2018-58785 [Patent Document 3] Patent Publication No. 10-218758 [Patent Document 4] Patent Publication No. 2024-012130 [Non-patent literature]

[0005] [Non-Patent Document 1] Eiko Oshimura et al., Fragrance Journal, 23, 61-66 (1995). [Non-patent document 2] Kakizawa, Yasushi, Journal of the Japanese Society of Cosmetic Chemistry, 42, 270-279 (2018). Summary of the Invention [Problem to be solved by the invention]

[0006] In order to solve these problems, the main object of the present invention is to provide a body cleanser composition containing an amino acid-based surfactant that produces fine bubbles that last during cleansing, has excellent foam stability, reduces stickiness during cleansing, leaves skin feeling refreshed after cleansing, and has excellent low-temperature and high-temperature stability. [Means for solving the problem]

[0007] As a result of extensive research to solve the above problems, the inventors discovered that by creating a body cleanser composition containing an amino acid surfactant, which is made of potassium cocoyl-β-alanine, an N-acylamino acid salt, a nonionic surfactant, and a polyol in a specific blend and pH, it is possible to achieve the problems of maintaining fine foam during cleansing, improving foam stability, reducing stickiness during cleansing, improving the refreshing feeling after cleansing, and even achieving stability at both low and high temperatures, thereby completing the present invention.

[0008] That is, the present invention is as follows. (1) The body cleanser composition contains (A) 0.2 to 8.0 wt% of cocoyl-β-alanine potassium, (B) 2.0 to 10.0 wt% of an N-acylamino acid salt, (C) 0.1 to 5.0 wt% of a nonionic surfactant, and (D) 0.1 to 20.0 wt% of a polyol, and the pH of the composition is in the range of pH 6.1 to pH 10.0.

[0009] (2) This is a body cleanser composition containing an amino acid surfactant according to (1), in which the N-acylamino acid salt of component (B) is an N-acylmethylalanine salt.

[0010] (3) This is a body cleanser composition containing an amino acid-based surfactant according to (1) or (2), in which the nonionic surfactant (C) is at least one selected from PPG-2 cocamide and cocamide DEA.

[0011] (4) This is a body cleanser composition containing an amino acid surfactant according to (1) or (2), in which the polyol (D) is at least one selected from isoprene glycol, glycerin, and dipropylene glycol. [Effects of the Invention]

[0012] According to the present invention, a body cleanser composition containing an amino acid-based surfactant can be provided, which produces fine bubbles that last during cleansing, has excellent foam stability, reduces stickiness during cleansing, leaves skin feeling refreshed after cleansing, and has excellent low-temperature stability and high-temperature stability. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described. An example of a commercially available product of cocoyl-β-alanine potassium, component (A), is Alanon (registered trademark) CBK manufactured by Kawaken Fine Chemicals Co., Ltd.

[0014] Component (A) is incorporated to improve the fineness of foam during cleansing, reduce stickiness during cleansing, and improve the refreshing feeling after cleansing. The content of component (A) in the amino acid surfactant-containing body cleanser composition is preferably 0.2 to 8.0 wt %. From the viewpoint of further improving the fineness of foam and reducing stickiness during cleansing, and the refreshing feeling after cleansing, it is more preferably 0.5 to 6.0 wt %. If the content is less than 0.2 wt %, the body cleanser composition containing the amino acid surfactant of the present invention may not be able to reduce stickiness during cleansing or provide the refreshing feeling after cleansing. If the content is more than 8.0 wt %, the low-temperature stability and high-temperature stability of the body cleanser composition containing the amino acid surfactant may be impaired.

[0015] The component (A) used in the body cleanser composition containing an amino acid surfactant of the present invention can be a potassium cocoyl-β-alanine-containing composition having a purity of 10% by weight or more. In addition to potassium cocoyl-β-alanine, the composition may contain solvents such as water, raw material residues, by-products such as free fatty acids, and other additives. Examples of such additives include unreacted β-alanine, fatty acids, fatty acid salts, and inorganic salts such as KOH and KCl.

[0016] The N-acyl amino acid salt (component (B)) is added to improve foam stability. Examples of the N-acyl amino acid salt (component (B)) include N-acyl sarcosine salt, N-acylaspartate salt, N-acylmethylalanine salt, N-acylmethyltaurine salt, N-acylglutamate salt, and N-acylglycine salt. Specific examples of the N-acyl sarcosine salt include lauroyl sarcosine salt (commercially available products include SOYPON (registered trademark) SLE and SLTA manufactured by Kawaken Fine Chemicals), oleoyl sarcosine salt, cocoyl sarcosine salt (commercially available products include SOYPON SCE manufactured by Kawaken Fine Chemicals), palmitoyl sarcosine salt, and myristoyl sarcosine salt (commercially available products include SOYPON M-30 manufactured by Kawaken Fine Chemicals). Specific examples of N-acylaspartates include lauroyl aspartate, acyl (C12,14) aspartate, myristyl aspartate, myristyl aspartic acid taurine salt, lauryl aspartate, and lauryl aspartic acid taurine salt. Specific examples of N-acylmethylalanine salts include cocoylmethylalanine salt (commercially available products include Alanon (registered trademark) ACE, manufactured by Kawaken Fine Chemical Co., Ltd.), myristoylmethylalanine salt (commercially available products include Alanon AME, manufactured by Kawaken Fine Chemical Co., Ltd.), lauroylmethylalanine salt (commercially available products include Alanon ALE and ALTA, manufactured by Kawaken Fine Chemical Co., Ltd.), cocoylhydroxyethyl-β-alanine salt, and lauroylhydroxyethyl-β-alanine salt. Specific examples of N-acyl methyl taurine salts include oleoyl methyl taurine salt, caproyl methyl taurine salt, cocoyl methyl taurine salt, stearoyl methyl taurine salt, palmitoyl methyl taurine salt, myristoyl methyl taurine salt, and lauroyl methyl taurine salt.Specific examples of N-acyl glutamates include olive oil fatty acid glutamate, capryloyl glutamate, cocoyl glutamate, stearoyl glutamate, palm fatty acid glutamate, palmitoyl glutamate, myristoyl glutamate, lauroyl glutamate, hydrogenated tallow glutamate, horse oil acyl glutamate, horse oil fatty acid glutamate, (coconut fatty acid / palm fatty acid / sunflower fatty acid) glutamate, (coconut fatty acid / hydrogenated beef tallow fatty acid) glutamate, etc. Examples of N-acyl glycine salts include capryloyl glycine salt, cocoyl glycine salt, palmitoyl glycine salt, lauroyl glycine salt, etc.

[0017] As component (B), N-acylmethylalanine salts are preferred from the viewpoint of further improving foam stability during washing.

[0018] The salt of component (B) is not particularly limited, but examples thereof include metal salts such as sodium salt, potassium salt, magnesium salt, etc., and organic salts such as triethanolamine salt, taurine salt, arginine salt, lysine salt, histidine salt, etc. In order to obtain a product with excellent handleability during production, sodium salt, triethanolamine salt, potassium salt, and taurine salt are preferred, and sodium salt, triethanolamine salt, and taurine salt are more preferred.

[0019] The content of component (B) in the body cleanser composition containing an amino acid surfactant is preferably 2.0 to 10.0% by weight. From the viewpoint of further improving foam stability during cleansing, it is more preferably 3.0 to 8.0% by weight. If it is less than 2.0% by weight, the body cleanser composition containing an amino acid surfactant of the present invention may not be able to achieve foam stability, while if it exceeds 10.0% by weight, the body cleanser composition containing an amino acid surfactant of the present invention may not be able to achieve reduced stickiness or a refreshing feeling during cleansing.

[0020] The component (B) used in the body cleanser composition containing an amino acid surfactant of the present invention can be an N-acylamino acid salt-containing composition with an N-acylamino acid salt purity of 20% by weight or more. In addition to the N-acylamino acid salt, the composition may contain solvents such as water, raw material residues, by-products such as free fatty acids, and other additives. Examples include unreacted amino acids, fatty acids and fatty acid salts, inorganic salts such as NaOH, KOH, NaCl, and KCl, triethanolamine, and triethanolamine salts.

[0021] Component (C) is added for the purposes of foam stability during washing and high-temperature stability. Specific examples of the nonionic surfactant component (C) include PPG-2 cocamide (available commercially as Amizet® 1PC manufactured by Kawaken Fine Chemicals Co., Ltd.), cocamide MEA (available commercially as Amizole® CME manufactured by Kawaken Fine Chemicals Co., Ltd.), cocamide DEA (available commercially as Amizole CDE-G manufactured by Kawaken Fine Chemicals Co., Ltd.), palm kernel fatty acid amide DEA (available commercially as Amizole KD-1 manufactured by Kawaken Fine Chemicals Co., Ltd.), and lauramide DE. A (commercially available Amizole LDE-G, manufactured by Kawaken Fine Chemicals Co., Ltd.), (Lauramide / Myristamide) DEA (commercially available Amizole LMDE-Y, manufactured by Kawaken Fine Chemicals Co., Ltd.), Lauramide MIPA (commercially available Amizole PLME-A, manufactured by Kawaken Fine Chemicals Co., Ltd.), PEG-3 Lauramide (commercially available Amizet 2L-Y, manufactured by Kawaken Fine Chemicals Co., Ltd.), (Lauryl / Myristyl) Glycol Hydroxypropyl Ether (commercially available Examples of the glycerin include Viscosafe (registered trademark) LMPE (manufactured by Kawaken Fine Chemical Co., Ltd.), cocamide methyl MEA, 2-ethylhexyl glyceryl ether, glyceryl 2-ethylhexanoate, glyceryl (behenate / eicosandioate), polyglyceryl (behenate / eicosandioate), alkyl glyceryl ether, alkyl glucoside, alkyl saccharide, ethylene oxide derivative of alkylphenol formalin condensate, alkyl polyglucoside, alkylene glycol fatty acid esters, polyoxyethylene glyceryl isostearate, isodecyl glyceryl ether, polyethylene glycol ether of a diester or triester of oleic acid and methyl glucose, glycerin alkyl ether, glycerin fatty acid ester, PEG-120 methyl glucose dioleate, ethylene glycol distearate, polyethylene glycol dipolyhydroxystearate, sucrose fatty acid esters, sorbitan sesquioleate, ceteareth-60 myristyl glycol, sorbitan monostearate, sorbitan fatty acid esters, sorbitan fatty acid esters,Polyoxyethylene sorbit tetraisostearate, tetraglycerin monolauryl ether, tetrapolyoxyalkylene ethylenediamine condensates, tri(caprylic / capric)glyceryl, Pluronic® types, propylene glycol fatty acid esters, pentaerythritol fatty acid esters, polyethylene glycol monooleate, polyethylene glycol-type nonionic surfactants, polyethylene glycol fatty acid esters, polyoxyalkylene / alkyl co-modified organopolysiloxane, polyoxyalkylene alkyl ethers, polyoxyalkylene alkylphenyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene ethers, polyoxyalkylene esters, polyoxyalkylene glycol, polyoxyalkylene glycol fatty acid esters, polyoxyalkylene glycerin fatty acid esters, polyoxyalkylene dimethyl dimer diol ether, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene castor oil derivatives, polyoxyalkylene hydrogenated castor oil derivatives, poly Polyoxyalkylene fatty acid amides, polyoxyalkylene fatty acid esters, polyoxyalkylene-modified organopolysiloxanes, polyoxyethylene POP alkyl ethers, polyoxyethylene alkylamines, polyoxyethylene alkyl allyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene alkyl thioethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene isostearyl ether, polyoxyethylene-octyldodecyl ether, polyoxyethylene glyceryl cocoate, polyoxyethylene-glycerin monoisostearate, polyoxyethylene glycerin fatty acid esters, polyoxyethylene cholestanol ether, polyoxyethylene cholesteryl ether, polyoxyethylene stanol ether, polyoxyethylene stearyl ether, polyoxyethylene sterol ether, polyoxyethylene cetostearyl hydroxymyristyrene ether, polyoxyethylene sorbitan monolaurate and other polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters,Polyoxyethylene sorbitol monolaurate, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene nonylphenyl ether, polyoxyethylene castor oil, polyoxyethylene phytostanol ether, polyoxyethylene phytosteryl ether, polyoxyethylene phytosterol ether, polyoxyethylene propylene glycol fatty acid esters, polyoxyethylene polyoxypropylene butyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene polyoxypropylene glycols, polyoxyethylene polyoxypropylene glyceryl ethers, polyoxyethylene methyl glucoside, polyoxyethylene PEG-glyceryl coconut oil fatty acid, polyoxyethylene lauryl ether, polyoxyethylene lanolin alcohol, polyoxyethylene lanolin derivatives, polyoxyethylene hydrogenated castor oil, polyoxyethylene hydrogenated castor oil fatty acid esters, polyoxyethylene hydrogenated castor oil derivatives, polyoxyethylene fatty acid esters, polyoxyethylene fatty acid diesters, poly Polyoxybutylene-polyoxyethylene-polyoxypropylene glyceryl ether, polyoxypropylene alkyl ether, polyoxypropylene diglyceryl ethers, polyoxypropylene monooctyl ether, polyglyceryl ether, polyglyceryl monoalkyl ether, polyglycerin alkyl ether, polyglycerin laurate, polyglycerin fatty acid ester, polysorbate, polypropylene glycol caprylyl ether, monoalkyl glyceryl ether, monoalkenyl glyceryl ether, ethylene glycol monooleate, monoglyceride derivatives, monoglycerin alkyl ether, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monolaurate, PEG-4 laurate, diethylene glycol laurate, propylene glycol laurate, hydrogenated castor oil derivatives, higher fatty acid sucrose esters, fatty acid oxybutylene, fatty acid glycol esters, fatty acid glycerin esters, fatty acid dioxybutylene, block polymers containing fatty alkyl groups, polyhydric alcohol-type nonionic surfactants, polyhydric alcohol fatty acid esters,Examples include sugar alcohol fatty acid esters, sugar ethers, and sugar esters.

[0022] As the component (C), from the viewpoint of further foam stability and high temperature stability, PPG-2 cocamide and cocamide DEA are particularly preferred.

[0023] The content of component (C) in the body cleanser composition containing an amino acid surfactant is preferably 0.1 to 5.0% by weight. From the viewpoint of further improving high-temperature stability, it is more preferably 0.3 to 4.0% by weight. If the content is less than 0.1% by weight, the high-temperature stability of the body cleanser composition containing an amino acid surfactant of the present invention may be impaired. If the content is more than 5.0% by weight, the body cleanser composition containing an amino acid surfactant may not achieve reduced stickiness during cleansing or a refreshing feeling after cleansing.

[0024] The component (C) used in the body cleanser composition containing an amino acid surfactant of the present invention can be a nonionic surfactant-containing composition with a nonionic surfactant purity of 90% by weight or more. In addition to the nonionic surfactant, the composition may contain solvents, raw material residues, by-products such as free fatty acids, and other additives. Examples include unreacted alkanolamines such as monoisopropanolamine and diethanolamine, propylene glycol, and polypropylene glycol.

[0025] Component (D) is formulated for the purposes of foam stability and low-temperature stability during washing. Examples of polyols that make up component (D) include 1,10-decanediol, 1,2-butanediol, 1,2-hexanediol, 1,3-butylene glycol, 1,4-butanediol, 1,5-pentanediol, 2,3-butanediol, allitol, isoprene glycol, inositol, ethyl hexanediol, octanediol, caprylyl glycol, xylitol, glycol, glycerin, glucose, diethylene glycol, glycerin derivatives such as diglycerin, dipropylene glycol, sucrose, sorbitol, talitol, and dextran. Examples of the sugars include saccharides such as ethylene glycol, triethylene glycol, tripropylene glycol, and trehalose; diols such as neopentyl glycol, butylethylpropanediol, fructose, propanediol, propylene glycol, hexanediol, hexylene glycol, pentaerythritol, pentylene glycol, maltitol, mannitol, and methylpropanediol; glycols such as methylene glycol, lauryl glycol, and lauryl glycol hydroxypropyl ether; lactose; and sugar alcohols.

[0026] As the component (D), isoprene glycol, glycerin, and dipropylene glycol are particularly preferred from the viewpoint of further foam stability and low temperature stability.

[0027] The content of component (D) in the body cleanser composition containing an amino acid surfactant is preferably 0.1 to 20.0% by weight. From the viewpoint of further improving low-temperature stability, it is more preferably 0.3 to 15.0% by weight. If the content is less than 0.1% by weight, the low-temperature stability of the body cleanser composition containing an amino acid surfactant of the present invention may deteriorate, while if it exceeds 20.0% by weight, the body cleanser composition containing an amino acid surfactant may not reduce stickiness during cleansing or provide a refreshing feeling after cleansing.

[0028] The component (D) used in the body cleanser composition containing an amino acid surfactant can be a polyol-containing composition with a polyol purity of 90% by weight or more. It may contain raw materials, impurities derived from the raw materials, by-products, solvents, catalysts, etc. For example, in the case of isoprene glycol, impurities derived from naphtha and azeotropes, etc., in the case of glycerin, impurities derived from fats and oils, triacylglycerols, other fatty acids, etc., and in the case of dipropylene glycol, impurities derived from propylene oxide, propylene glycol, polypropylene glycol, etc.

[0029] The pH of the body cleanser composition containing an amino acid surfactant is preferably 6.1 to 10.0. From the viewpoint of improving the refreshing feeling during cleansing and improving foam stability, it is more preferably 6.4 to 9.5. If the pH is below 6.0, the low-temperature stability and high-temperature stability of the body cleanser composition containing an amino acid surfactant of the present invention may be impaired, while if it exceeds 10.0, the body cleanser composition containing an amino acid surfactant may not provide a refreshing feeling during cleansing. pH adjusters that can be used in body cleansers are not particularly limited, but examples include alkali metal hydroxides such as KOH and NaOH, alkanolamines such as triethanolamine, organic acids such as citric acid, lactic acid, glutamic acid, and malic acid, and inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid.

[0030] When surfactants bind to divalent metals present in tap water, they form water-insoluble chelate compounds called scum. This scum remains on the skin surface during cleansing, and it has been reported that it contributes to the feeling of skin during and after cleansing (Fujiwara N., et al., J.Soc.Csmet.Chem.Jpn., 26, 107-112 (1992)) (Endo M., et al., J.Jpn.Soc.Colour.Mater., 85, 449-452 (2012)).

[0031] In a report by Sakai et al., the adsorption state of amino acid surfactants on a substrate mimicking the hydrophobicity of skin in the presence of calcium ions was clarified using a quartz crystal microbalance (QCM) (Sakai K., et al., J. Oleo Sci., 72, 709-714 (2023)). This can be applied to analyze the adsorption and desorption behavior of scum on a simulated human skin substrate from the time of washing to after washing. This can clarify the relationship between human skin and scum, which can be used to predict the feeling of use, such as a refreshing sensation.

[0032] In the body cleanser composition of the present invention containing an amino acid-based surfactant, if no scum is adsorbed onto the skin surface, the stickiness caused by scum during cleansing may not be reduced and a refreshing feeling after cleansing may not be obtained.

[0033] In addition, the melting point of scum varies depending on the surfactant. For example, it has been reported that the melting point of scum of laurate, a typical fatty acid salt, is 170°C to 180°C (Yamamoto Y., et al., Acs Omega, 2, 113-121 (2017)).

[0034] In order to obtain a suitable refreshing feeling after washing, the melting point of the scum in the body cleanser composition containing an amino acid surfactant of the present invention is preferably 130° C. to 190° C. If it is less than 130° C., the body cleanser composition containing an amino acid surfactant of the present invention may not reduce stickiness during washing, and if it exceeds 190° C., the refreshing feeling after washing in the body cleanser composition containing an amino acid surfactant of the present invention may be exaggerated, resulting in an unpleasant feeling of tightness.

[0035] In addition, the foam cleanser composition of the present invention may contain other components as needed within qualitative and quantitative ranges that do not substantially impair the effects of the present invention. However, it may be necessary to control the amount of components that may inhibit the effects of components (A) to (D).

[0036] Other components include, for example, cationic polymers such as polyquaternium-10, polyquaternium-7, and guar hydroxypropyltrimonium chloride. Other examples of the active ingredients include silicones, glycerin derivatives, polyols, sugars or derivatives thereof, moisturizers, water-soluble moisturizing oils, phosphocholine derivatives, lactones, ester oils or derivatives thereof, natural ceramides or derivatives thereof, natural oils, hydrogenated oils, hydrocarbon oils, extracts, natural product extracts, natural product extract components, proteins or hydrolysates thereof, lower alcohols, surfactant aids, emulsifiers, opacifiers, sequestering agents, ultraviolet absorbers, antioxidants, preservatives, powder components, urethanes, blood circulation promoters, antiseborrheic agents, anti-aging agents, emollients, keratolytic agents, skin conditioning agents, anti-inflammatory agents, anti-inflammatory agents, cooling agents, amino acids or derivatives thereof, vitamins or derivatives thereof, polyphenols, dyes, coloring materials, and fragrances.

[0037] The body cleanser composition containing an amino acid surfactant of the present invention is a transparent liquid and can be used in products such as body cleansers, including those for the face. [Example]

[0038] The effects of the present invention will be explained in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, unless otherwise specified, the components used were special grade or first grade reagents purchased from Fujifilm Wako Pure Chemical Industries, Ltd.

[0039] Test Method Body cleanser compositions containing amino acid surfactants having the compositions shown in Tables 1 and 2 were prepared according to standard methods. The pH was adjusted with citric acid. The pH was measured at 25°C using a pH / ION METER (HORIBA, Ltd., LAQUA (registered trademark) F-72). This resulted in the body cleanser compositions containing amino acid surfactants described in Examples 1 to 10 and Comparative Examples 1 to 6. The numerical values ​​in the compositions indicate the weight percent of the pure content. The obtained body cleanser compositions containing amino acid surfactants were evaluated as follows. The results are shown in Tables 1 and 2.

[0040] (Method for evaluating low-temperature stability) 100 g of each of the evaluation samples prepared in Examples 1 to 10 and Comparative Examples 1 to 6 was taken and filled into a glass container (PS-13K, Daiichi Glass Co., Ltd.). After storage at 5°C for 4 weeks, the appearance was visually observed. The evaluation was based on the following criteria. <Low temperature stability evaluation criteria> ◎: Appearance is transparent and unchanged ○: Appearance is slightly translucent, no precipitates △: Translucent appearance with precipitates ×: Phase separation and precipitates observed

[0041] (Method for evaluating high temperature stability) 100 g of each evaluation sample prepared in Examples 1 to 10 and Comparative Examples 1 to 6 was filled into a glass container (PS-13K, Daiichi Glass Co., Ltd.), and the initial hue was determined using the APHA (American Public Health Association: APHA) value. After storage at 50°C for 4 weeks, the appearance was visually observed and the hue was determined using the APHA value. The hue change rate was calculated using the APHA value (X) immediately after preparation and the APHA value (Y) after storage at 50°C for 4 weeks using the following formula: Hue change rate (%) = (YX) / X x 100 As a calculation example, in Example 1, X was 10, Y was 10, and the hue change rate was 0%. Thereafter, the results were evaluated according to the following criteria. <Evaluation criteria for high temperature stability> ◎: No change Hue change rate (%) 0-30% 〇: Slight change Hue change rate (%) 31-50% △: Colored Hue change rate (%) 51-100% ×: Significantly colored. Hue change rate (%): 101-150%

[0042] (Methods for evaluating the fineness of foam during washing, foam stability, ease of rinsing, and refreshing feeling after washing) Ten in-house expert panelists lathered 5 g of the evaluation samples prepared in Examples 1 to 10 and Comparative Examples 1 to 6 approximately 30 times with a nylon towel, washed the inside of the left upper arm of each subject, rinsed, and towel-dried. The fineness of the lather during washing, lather stability, ease of rinsing, and refreshing feeling after washing were evaluated according to the following criteria. The evaluation was based on the average score of the 10 panelists, and the results were ranked. <Fineness of foam when washing> 4: The bubbles are very fine 3: Fine bubbles 2: Neither 1: The foam is coarse The rankings were ◎: 4 to 3.5, ○: less than 3.5 to 3, △: less than 3 to 2, ×: less than 2 to 1. <Foam stability during cleaning> 4: The foam lasts very well 3: The foam lasts well 2: Neither 1: The foam doesn't last long The rankings were ◎: 4 to 3.5, ○: less than 3.5 to 3, △: less than 3 to 2, ×: less than 2 to 1. <Easy rinsing when cleaning> 4: Not sticky and very easy to rinse 3: Not sticky and somewhat easy to rinse off 2: Neither 1: Sticky and not easy to rinse The rankings were ◎: 4 to 3.5, ○: less than 3.5 to 3, △: less than 3 to 2, ×: less than 2 to 1. <Refreshing feeling after washing> 4: Feels refreshing 3: Feels slightly refreshing 2: Neither 1: No refreshing feeling at all, or a feeling of tightness The rankings were ◎: 4 to 3.5, ○: less than 3.5 to 3, △: less than 3 to 2, ×: less than 2 to 1.

[0043] (scum adsorption) Fabrication of QCM substrate A substrate mimicking the hydrophobicity of human skin was prepared by treating the gold surface with hexadecanethiol based on a report by Romain et al. (Romain B., et al., Langmuir, 26, 3077-3083 (2010).). QCM measurements This measurement was performed using QSense (manufactured by Altech Corporation). First, a sodium chloride solution was run to stabilize the baseline, and then the samples of Examples 1 to 10 and Comparative Examples 1 to 6 diluted with purified water were run. Then, a calcium chloride aqueous solution was run to replace the air in the flow. The calcium chloride aqueous solution was run, and the ΔF3 / 3 (Hz) value was determined at the point when the value became constant. A ΔF3 / 3 (Hz) value of -1.5 or less was defined as scum adsorption on the substrate. Furthermore, a ΔF3 / 3 (Hz) value of more than -1.5 was defined as no scum adsorption on the substrate. <Evaluation criteria for scum adsorption> ○: ΔF3 / 3 (Hz) value is -1.5 or less ×: ΔF3 / 3 (Hz) value exceeds -1.5

[0044] (scum melting point) Preparation of scum The samples of Examples 1 to 10 and Comparative Examples 1 to 6 were subjected to a salt exchange reaction between an aqueous ethanol solution and calcium chloride to prepare scum. Scum melting point measurement Approximately 0.1 g of the scum obtained by the above-mentioned scum preparation in Examples 1 to 10 and Comparative Examples 1 to 6 was weighed out, and the melting point was measured using a TG-DTA (TG-DTA8122, manufactured by Rigaku Corporation). The melting points of the scum in Examples 1 to 10 and Comparative Examples 1 to 6 were evaluated according to the following criteria. <Evaluation criteria for scum melting point> Good: Scum melting point is 130℃ or higher and 190℃ or lower ×: The melting point of the scum is less than 130°C or more than 190°C

[0045] Examples 1 to 10 [Table 1]

[0046] Comparative Examples 1 to 6 [Table 2]

[0047] *1: Alanon CBK (Kawaken Fine Chemical Co., Ltd.), *2: Alanon ALE (Kawaken Fine Chemical Co., Ltd.), *3: Amizet 1PC (Kawaken Fine Chemical Co., Ltd.), *4: Amizol CDE-G (Kawaken Fine Chemical Co., Ltd.), *5: Isoprene glycol (Kuraray Co., Ltd.), *6: Softazoline (registered trademark) LHL-SF (Kawaken Fine Chemical Co., Ltd.)

[0048] Evaluation results Examples 1 to 10, which were prepared within the range of the amino acid surfactant-containing body cleanser compositions of the present invention, were rated as good or better in all evaluations, and were excellent in low-temperature stability, high-temperature stability, fineness of foam during cleansing, foam stability, and ease of rinsing. Furthermore, they were excellent in scum adsorption, had scum melting points within the range, and provided an excellent refreshing feeling after cleansing. On the other hand, in Comparative Example 1, where the (A) component and the (B) component were outside the range, the low-temperature stability, high-temperature stability, and ease of rinsing during washing were poor. In addition, the melting point of the scum exceeded 190°C, which was outside the range, and the refreshing feeling after washing was also poor. In Comparative Example 2, where the (A) component and the (B) component were below the range, the high-temperature stability, fineness of the foam during washing, and ease of rinsing during washing were poor. In addition, the scum adsorption was poor, the scum melting point was below 130°C, which was outside the range, and the refreshing feeling after washing was also poor. In Comparative Example 3, where the (C) component was outside the range, the ease of rinsing during washing was poor. In addition, the scum adsorption was poor, the scum melting point was below 130°C, which was outside the range, and the refreshing feeling after washing was also poor. In Comparative Example 4, where the (C) component was below the range, the low-temperature stability and high-temperature stability were poor. In Comparative Example 5, where the (D) component and the pH were outside the range, the ease of rinsing during washing was poor, and the adsorption of scum was poor, resulting in a melting point of the scum below 130°C, which was outside the range, and the refreshing feeling after washing was poor.In Comparative Example 6, where the (D) component and the pH were below the range, the low-temperature stability, high-temperature stability, and foam stability during washing were poor. [Industrial Applicability]

[0049] The body cleanser composition of the present invention containing an amino acid-based surfactant can be used in body cleanser products intended for cleaning the face or body, thereby enhancing the commercial value of products such as body shampoos and facial cleansers.

Claims

1. A body cleanser composition containing an amino acid surfactant, comprising (A) 0.2 to 8.0% by weight of potassium cocoyl-β-alanine, (B) 2.0 to 10.0% by weight of an N-acylamino acid salt, (C) 0.1 to 5.0% by weight of a nonionic surfactant, and (D) 0.1 to 20.0% by weight of a polyol, and having a pH in the range of 6.1 to 10.

0.

2. 2. The body cleansing composition according to claim 1, wherein the N-acylamino acid salt of component (B) is an N-acylmethylalanine salt.

3. 3. The body cleanser composition according to claim 1, wherein the nonionic surfactant (C) is at least one selected from the group consisting of PPG-2 cocamide and cocamide DEA.

4. This is a body cleanser composition containing an amino acid-based surfactant according to claim 1 or claim 2, wherein the polyol component (D) is at least one selected from isoprene glycol, glycerin, and dipropylene glycol.

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