Skin cleansing product

Abstract

To provide a novel skin cleansing agent, particularly one that leaves the skin feeling smooth after washing. [Solution] (A) Oleoyl sarcosine or its salt (B) Polyglycerol fatty acid esters in which two or more fatty acids are bonded together. A skin cleansing agent containing at least [a certain ingredient].

Description

Technical Field

[0001] The present invention relates to a skin cleansing agent.

Background Art

[0002] Skin cleansing agents contain surfactants to remove sebum, cosmetics, etc. Depending on the type of surfactant used, a skin cleansing agent may cause a tight feeling or a dry feeling, and a good after-use feeling is required. Powdery (granular) skin cleansing agents are known as skin cleansing agents. Since powdery skin cleansing agents do not contain water compared to liquid or gel状 ones, it is possible to formulate components that are easily deactivated by water. In addition, it is possible to commercialize the product without formulating preservatives or bactericides, and it is possible to provide a safer product. The applicant has proposed a powdery skin cleansing agent that suppresses the tight feeling and dry feeling after washing and can feel a smooth feeling (Patent Documents 1 to 3). Powdery skin cleansing agents are excellent in the after-use feeling, but it is necessary to lather well during use.

[0003] Among consumers, a certain percentage prefer skin cleansing agents in the form of cream状, foam状, liquid状, etc. that are easy to lather and can be used easily. On the other hand, it is difficult for these skin cleansing agents in easily latherable dosage forms to give a smooth feeling after washing. Skin cleansing agents are required to be excellent in the skin feeling after use, such as a smooth feeling, a moist feeling, a veil feeling, a smooth texture, etc. It is an issue to provide a skin cleansing agent that has a smooth feeling after washing like a powdery skin cleansing agent while being in a dosage form other than powdery.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

[0005] The present invention aims to provide a novel skin cleansing agent, particularly one that provides excellent smoothness after washing. [Means for solving the problem]

[0006] The means for solving the problems of the present invention are as follows. 1. (A) Oleoyl sarcosine or its salt (B) Polyglycerol fatty acid esters in which two or more fatty acids are bonded together. A skin cleansing agent characterized by containing at least one of the following. 2. (B) The skin cleansing agent according to 1, characterized in that the average degree of polymerization of the polyglycerin in the polyglycerin fatty acid ester is 2 or more and 30 or less. 3. (B) The skin cleansing agent according to 1. or 2., characterized in that the acyl group of the polyglycerin fatty acid ester has 6 or more carbon atoms and 24 or less carbon atoms. [Effects of the Invention]

[0007] The skin cleansing agent of the present invention provides a smooth feeling after washing. Furthermore, the skin cleansing agent of the present invention provides a moisturizing feeling after washing, suppresses hardening at low temperatures, and exhibits excellent low-temperature stability. Smoothness refers to a state in which the fingers glide smoothly when touching the skin, that is, a state in which the fingers move without resistance. It can also be described as a feeling that is not sticky, slimy, or causes friction and snagging. Moisture refers to the moist feeling felt when touching the skin with the fingers. [Modes for carrying out the invention]

[0008] The skin cleansing agent of the present invention contains at least (A) oleoyl sarcosine or a salt thereof, and (B) a polyglycerol fatty acid ester in which two or more fatty acids are bonded.

[0009] (A) Ingredients: Oleoyl sarcosine or its salt Oleoyl sarcosine is an anionic surfactant obtained by the acylation reaction between the amino acid sarcosine (N-methylglycine) and the fatty acid oleic acid. Examples of oleoyl sarcosine salts include alkali metal salts such as sodium and potassium, alkanolamine salts such as triethanolamine, and basic amino acid salts such as lysine and arginine. In the present invention, one or more types of oleoyl sarcosine or its salts can be used.

[0010] The skin cleansing composition of the present invention may contain N-acyl sarcosine or a salt thereof other than component (A). Examples of acyl groups in N-acyl sarcosine or its salts other than component (A) include octanoyl group, decanoyl group, lauroyl group, myristoyl group, palmitoyl group, stearoyl group, isostearoyl group, linoleyl group, and coconut oil fatty acid acyl group (cocoyl group). Examples of salts include alkali metal salts such as sodium and potassium, alkanolamine salts such as triethanolamine, and basic amino acid salts such as lysine and arginine. Note that coconut oil fatty acids are a mixture of fatty acids such as lauric acid, myristic acid, palmitic acid, and oleic acid.

[0011] The skin cleansing composition of the present invention preferably contains 0.1% by mass or more of component (A) relative to the total amount of the skin cleansing composition, more preferably 0.3% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of the smooth feeling after washing. Furthermore, from the viewpoint of the moisturizing feeling after washing, the skin cleansing composition preferably contains 10% by mass or less of component (A) relative to the total amount of the skin cleansing composition, more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2% by mass or less. Furthermore, if the product contains N-acyl sarcosine or a salt of a component other than (A), it is preferable that the product contains 20% by mass or more of (A) oleoyl sarcosine or a salt of a component other than (A) relative to the total amount of N-acyl sarcosine or a salt of a component other than (A). More preferably, it contains 22% by mass or more, even more preferably, 25% by mass or more, even more preferably, 50% by mass or more, and even more preferably, 100% by mass.

[0012] (B) Component: Polyglycerol fatty acid ester, which is a compound of two or more fatty acids. The skin cleansing agent of the present invention contains (B) a polyglycerol fatty acid ester (hereinafter also referred to as polyglycerol fatty acid ester) in which two or more fatty acids are bonded together. In the polyglycerol fatty acid ester used in the present invention, the number of fatty acid bonds is not particularly limited as long as the effects of the present invention are achieved, but for example, it is 2 to 12, and from the viewpoint of smoothness after washing and low temperature stability, 6 or less is preferred, and 3 or less is more preferred. The average degree of polymerization of the polyglycerin in the polyglycerin fatty acid ester used in the present invention is not particularly limited as long as it achieves the effects of the present invention, but for example it is 2 to 30, and from the viewpoint of moisturizing feeling after washing and low temperature stability it is preferably 4 or more, more preferably 6 or more, and also preferably 20 or less, and more preferably 10 or less. The method for calculating the average degree of polymerization of polyglycerin is not particularly limited, but examples include a method that calculates it from the hydroxyl value, or a method that determines the composition of polyglycerin from gas chromatography, liquid chromatography, thin-layer chromatography, gas chromatography-mass spectrometry, or liquid chromatography-mass spectrometry and then calculates the average degree of polymerization.

[0013] In the polyglycerin fatty acid ester used in the present invention, the number of carbon atoms in the acyl group is not particularly limited as long as the effects of the present invention are achieved, but for example, it is 6 to 24, and from the viewpoint of smoothness after washing and low temperature stability, 8 or more is preferred, 10 or more is more preferred, 22 or less is preferred, 20 or less is more preferred, and 18 or less is even more preferred. The acyl group may be saturated or unsaturated, and may be linear or branched, and two or more types may be used. For example, examples of fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, linoleic acid, etc., and one or more of these may be used in combination. In addition, mixed fatty acids containing two or more fatty acids such as coconut oil fatty acid, palm fatty acid, palm kernel fatty acid, and hydrogenated beef tallow fatty acid may also be used.

[0014] Specifically, the polyglycerol fatty acid esters in which two or more fatty acids are bonded together for use in this invention include: Polyglyceryl-10 diisostearate, polyglyceryl-6 diisostearate, polyglyceryl-3 diisostearate, polyglyceryl-2 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-6 dioleate, polyglyceryl-5 dioleate, polyglyceryl-10 distearate, polyglyceryl-6 distearate, polyglyceryl-3 distearate, polyglyceryl-2 distearate, polyglyceryl-10 dimyristate, polyglyceryl-10 dilaurate, and other polyglycerin fatty acid diesters. Polyglyceryl-10 triisostearate, polyglyceryl-2 triisostearate, polyglyceryl-10 trioleate, polyglyceryl-5 trioleate, polyglyceryl-10 tristearate, polyglyceryl-6 tristearate, polyglyceryl-5 trimiristate, polyglyceryl-10 trilaurate, polyglyceryl-6 tricaprylate, and other polyglycerin fatty acid triesters. Polyglyceryl-2 tetraisostearate, polyglyceryl-10 tetraoleate, polyglyceryl-10 tetralaurate, polyglyceryl-6 tetracaprylate and other polyglyceryl fatty acid tetraesters, Polyglyceryl-10 pentaisostearate, polyglyceryl-10 pentaoleate, polyglyceryl-10 pentastearate, polyglyceryl-20 penta(caprylic acid / capric acid) and other polyglyceryl fatty acid pentaesters, Polyglyceryl-20 hexacaprylate, polyglyceryl-10 decaisostearate, polyglyceryl-10 dodeca(caprylic acid / capric acid) and the like, are mentioned, and one or more of these can be used.

[0015] Among these, from the viewpoints of rinsing moist feeling and low-temperature stability, polyglyceryl-10 diisostearate, polyglyceryl-6 diisostearate, polyglyceryl-2 diisostearate, polyglyceryl-10 dioleate, polyglyceryl-10 distearate, polyglyceryl-10 tristearate, polyglyceryl-6 tricaprylate, and polyglyceryl-20 hexacaprylate are more preferable, and polyglyceryl-10 diisostearate, polyglyceryl-10 dioleate, and polyglyceryl-6 tricaprylate are even more preferable.

[0016] From the viewpoints of smooth feeling and moist feeling after rinsing, the skin cleanser of the present invention preferably contains 0.1% by mass or more of component (B), more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, and preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less, based on the total amount of the skin cleanser. From the viewpoints of smooth feeling and moist feeling after rinsing, the mass ratio ((A) / (B)) of component (A) to component (B) in the skin cleanser of the present invention is preferably 0.1 or more, more preferably at least 0.5, even more preferably at least 1.0, and preferably 10 or less, more preferably 5.0 or less, and even more preferably 3.0 or less.

[0017] (C) component: fatty acid or its salt The skin cleansing agent of the present invention preferably contains (C) fatty acid or its salt. The (C) component is an anionic surfactant. Examples of the fatty acid of the (C) component include linear or branched saturated or unsaturated fatty acids having 8 to 22 carbon atoms, such as caprylic acid, capric acid, lauric acid, myristic acid, stearic acid, oleic acid, palmitic acid, linoleic acid, etc. One or more of these can be mixed and used. Also, a mixed fatty acid containing two or more fatty acids such as coconut oil fatty acid, palm fatty acid, palm kernel fatty acid, hardened beef tallow fatty acid, etc. can be used. Examples of its salt include alkali metal salts such as sodium and potassium, alkanolamine salts such as triethanolamine, and basic amino acid salts such as lysine and arginine. The fatty acid of the (C) component preferably contains lauric acid, myristic acid, palmitic acid, and stearic acid.

[0018] From the viewpoint of foam quality, the skin cleansing agent of the present invention preferably contains 1.0% by mass or more, more preferably 2.0% by mass or more, further preferably 5.0% by mass or more of the (C) component with respect to the total amount of the skin cleansing agent, and preferably 40% by mass or less, more preferably 35% by mass or less, further preferably 30% by mass or less, even more preferably 25% by mass or less, and even more preferably 20% by mass or less. When the skin cleansing agent of the present invention contains the (C) component, the mass ratio of the (C) component to the (A) component ((C) / (A)) is preferably 3.0 or more, more preferably 5.0 or more, further preferably 7.0 or more, and preferably 20 or less, more preferably 15 or less from the viewpoint of the feeling of use after washing.

[0019] In addition to components (A) to (C), the skin cleansing composition of the present invention may appropriately contain anionic surfactants, amphoteric surfactants, cationic surfactants, and nonionic surfactants, to the extent that they do not adversely affect the effects of the present invention. The total amount of all surfactants in the skin cleansing composition of the present invention is preferably 15% by mass or more, more preferably 20% by mass or more, from the viewpoint of foam quality, and preferably 45% by mass or less, and more preferably 40% by mass or less, from the viewpoint of rapid foaming. Furthermore, the skin cleansing composition of the present invention preferably contains 1.0% by mass or more and 15% by mass or less of component (A) relative to the total amount of surfactants, from the viewpoint of feel and foam quality. The content of component (A) relative to the total amount of surfactant is more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, even more preferably 4.0% by mass or more, even more preferably 12% by mass or less, even more preferably 10% by mass or less, and even more preferably 8.0% by mass or less. Furthermore, the skin cleansing agent of the present invention may contain alcohol, polyhydric alcohol, sugars, sugar alcohols, clay minerals, thickeners, colorants, excipients, pigments, inorganic powders, plant extracts, pH adjusters, salts, preservatives, metal ion chelating agents, fragrances, etc. It may also contain other pharmacoactive ingredients and physiologically active ingredients.

[0020] Examples of polyhydric alcohols, sugars, and sugar alcohols include glycerin, diglycerin, 1,3-butylene glycol, propylene glycol, dipropylene glycol, 1,2-pentanediol, glucose, sorbitol, mannose, mannitol, galactose, galactitol, maltose, maltitol, trehalose, erythritol, xylose, xylitol, sucrose, lactose, lactitol, difructose anhydride, methyl gluceth-10, PPG-10 methyl glucose, and glycereth-26.

[0021] Examples of preservatives include methylparaben and ethylparaben. Examples of metal ion chelating agents include ethylenediaminetetraacetate disodium, edetate, and edetate salts such as sodium edetate salt. Examples of clay minerals include bentonite and kaolin. Examples of thickening agents include carbomer. Examples of medicinal ingredients include vitamin C derivatives such as L-ascorbic acid, L-ascorbic acid phosphate, L-ascorbic acid monopalmitate, L-ascorbic acid dipalmitate, and L-ascorbic acid-2-glucoside; whitening agents such as glutathione and Saxifraga stolonifera extract; skin activators such as royal jelly and beech tree extract; blood circulation promoters such as capsaicin, gingerol, cantharis tincture, caffeine, tannic acid, and γ-oryzanol; anti-inflammatory agents such as glycyrrhizic acid derivatives and azulene; and lysozyme chloride.

[0022] The dosage form of the skin cleansing agent of the present invention is not particularly limited and may be any of the following: cream, foam, gel, powder, granules, solid, liquid, aerosol, etc. Among these, cream, foam, liquid, and solid forms are preferred, and cream form is more preferred. Furthermore, the skin cleansing agent of the present invention can be used as a facial cleanser, body soap, hand soap, etc. [Examples]

[0023] The components listed in Tables 1 and 2 were heated to 80°C in mass percent, mixed to form a homogeneous mixture, and then cooled to room temperature to obtain a cream-type skin cleanser. The following evaluations were performed on the obtained skin cleansing agents. The results are shown in Tables 1 and 2.

[0024] Evaluation items ·hardness 50g of skin cleansing solution was filled into cream bottles, and measurements were taken using a FUDOH rheometer (manufactured by Rheotech Co., Ltd.) under the following conditions: RANGE: 200g force, adapter: flat plate φ1cm, sample stage speed: 6cm / min, and entry width: 3cm. "Low temperature stability" The hardness value at 5°C was evaluated according to the following criteria. ○: 20g or more, but less than 120g. △: Weight between 120g and 200g. ×: Weight of 200g or more.

[0025] • Sensory evaluation Based on a consensus among three expert panelists, participants took 2g of the skin cleanser in their palms, added an appropriate amount of water to create a lather, washed their faces, rinsed thoroughly, and towel-dried their skin. The smoothness and moisture level of the skin were then evaluated as follows. "Moisture feeling" ○: I feel moisturized. △: Slightly moisturizing. ×: Does not feel moisturized. "Smooth feeling" ○: I feel a smooth texture. △: Slightly smooth texture. ×: Does not feel smooth.

[0026] [Table 1]

[0027] [Table 2]

[0028] The skin cleansing agent obtained in Comparative Example 1, which did not contain either component (A) or (B) of the present invention, was inferior in both moisturizing and smoothing sensations after washing. The skin cleansing agents obtained in Comparative Examples 2 and 4, which did not contain component (A) of the present invention, were inferior in smoothing sensations after washing. The skin cleansing agents obtained in Comparative Examples 3, 5-14, which did not contain component (B) of the present invention, were inferior in moisturizing sensations after washing. The skin cleansing agent obtained in the embodiment of the present invention exhibited excellent moisturizing and smoothing properties after washing.

[0029] The following are examples of formulations. The resulting skin cleansing agents exhibited excellent smoothness and moisturizing properties after washing. Furthermore, even at low temperatures, precipitation and increased pump pressure in Formulation Example 1, and the increase in hardness in Formulation Examples 2 and 3 were suppressed, demonstrating excellent low-temperature stability.

[0030] Prescription Example 1: Cleansing wash in a foaming container Display name Mass% Polyglyceryl-10 Diisostearate 1 Oleoyl sarcosine 1 BG 10 Glycerin 10 Sorbitol 7 Sodium Cocoamphoacetate 2 Potassium cocoyl glutamate 6 Methylgluceth-10 3 Maltitol 3 K1 hydroxide Dipotassium glycyrrhizate 0.1 Betaine 0.1 water residue

[0031] Prescription Example 2: Solid Soap Display name Mass% Sodium laurate 27 Sodium palmitate 27 Sodium myristate 21 Oleoyl sarcosine K 1.5 Potassium myristate 4 Potassium laurate 4 Sorbitol 2 Glycerin 2 Sodium Cocoyl Glycinate 1 Bentonite 2 Cocamidopropyl betaine 2 Sodium Cocoyl Glutamate 1 Potassium palmitate 1 Polyglyceryl-10 Diisostearate 1 Pentasodium pentetate 0.1 fragrance 1 water residue

[0032] Prescription Example 3: Cream-type cleanser Display name Mass% water residue Myristic acid 18 Glycerin 14 Stearic acid 8 K6 hydroxide Sorbitol 5 BG 5 Lauric acid 2 Lauramidopropyl hydroxysultaine 2 Palmitic acid 2 Oleoyl sarcosine 2 Polyglyceryl-10 Diisostearate 1.5 Sodium lauroyl methylalanine 1.5 PEG-75 1 Glyceryl stearate (SE) 1 PEG-60 Glyceryl Isostearate 1 Polyquaternium-39 0.4 Cocamidopropyl betaine 0.4

Claims

1. (A) Oleoyl sarcosine or its salt (B) Polyglycerol fatty acid esters in which two or more fatty acids are bonded together A skin cleansing agent characterized by containing at least one of the following.

2. (B) The skin cleansing agent according to claim 1, characterized in that the average degree of polymerization of the polyglycerin in the polyglycerin fatty acid ester is 2 or more and 30 or less.

3. (B) The skin cleansing agent according to claim 1 or 2, characterized in that the acyl group of the polyglycerin fatty acid ester has 6 or more carbon atoms and 24 or less carbon atoms.

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