Skin cleansing composition

Abstract

To provide a skin cleansing composition that comprises an amino acid-based surfactant, does not cause a slimy feeling during rinsing, giving a smooth feeling, and also gives a moist feeling after towel dry, with the moist feeling lasting for a long time.SOLUTION: A skin cleansing composition comprises the following components (A)-(C): (A) an acylamino acid-based surfactant, (B) isomalt and (C) silica.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] In recent years, there has been a strong demand for skin cleansers that provide a good feel during rinsing and after towel drying. That is, there is a demand for skin cleansers that provide a smooth feeling during rinsing, a moist feeling after towel drying, and a lasting moist feeling. Skin cleansers that use fatty acid salts leave soap scum on the skin during rinsing, which creates friction between the skin and fingers, creating a catching sensation that makes it easy to feel that dirt and cleanser have been removed, and leaving the skin feeling refreshed.However, in addition to their high cleansing power, the catching sensation during rinsing can easily be felt as a tight feeling, which can make the skin feel as if it is losing moisture, which has been a problem. On the other hand, skin cleansers using amino acid surfactants have mild cleansing power and do not cause a tight feeling during rinsing, making it easy to feel that the skin has been gently cleansed. For example, Patent Document 1 proposes a skin cleanser composition containing (A) an acylamino acid surfactant, (B) a nonionic surfactant, (C) a sugar alcohol, (D) a water-soluble polymer, and (E) water, which can impart a moist and soft feeling to the skin after cleansing, and which provides a massaging effect during cleansing and a stopping sensation during rinsing. Patent Document 2 proposes a skin cleanser composition that is excellent in imparting a moist feeling to the skin after cleansing, which contains (A) one or more amino acid surfactants selected from the group consisting of N-acylaspartates and N-acylglutamates, (B) a fatty acid polyglyceryl having an average number of added moles of 7 to 15, and (C) a highly polymerized polyethylene glycol having a number-average molecular weight of 100,000 to 500,000. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-214372 A [Patent Document 2] Patent Publication No. 2021-147328 Summary of the Invention [Problem to be solved by the invention]

[0004] Skin cleansers that use amino acid-based surfactants often have the problem of leaving a sticky feeling behind, making it difficult to feel that the dirt and cleanser have been removed.Furthermore, they do not leave the skin feeling sufficiently moisturized after towel drying. To provide a skin cleansing composition which uses an amino acid-derived surfactant, gives a smooth feeling without stickiness when rinsing, gives a moist feeling after towel drying, and further provides a sustained moist feeling. [Means for solving the problem]

[0005] The means for solving the problems of the present invention are as follows. 1. A skin cleansing composition characterized by containing the following components (A) to (C): (A) Acylamino acid surfactants (B) Isomalt (C) Silica 2. The skin cleansing composition according to 1., which contains, as component (A), one or more of acyl glutamate, acylaspartate, acylalanine salt, acylmethylalanine salt, and acylglycine salt. [Effects of the Invention]

[0006] The skin cleansing composition of the present invention is characterized by not leaving a sticky feeling after rinsing and leaving a smooth feeling. Furthermore, the skin cleansing composition of the present invention is characterized by leaving a moist feeling after towel drying, and the moist feeling lasts. DETAILED DESCRIPTION OF THE INVENTION

[0007] The skin cleansing composition of the present invention contains (A) an acylamino acid surfactant, (B) isomalt, and (C) silica.

[0008] Component (A) The acyl group of the acyl amino acid surfactant can be a straight-chain or branched-chain acyl group derived from a saturated or unsaturated fatty acid having 8 to 22 carbon atoms. Examples of fatty acids include caprylic acid, capric acid, lauric acid, myristic acid, stearic acid, palmitic acid, oleic acid, linoleic acid, coconut oil fatty acid, palm fatty acid, palm kernel fatty acid, and hardened beef tallow fatty acid. One or more of these can be used in combination. Examples of amino acids in acyl amino acid surfactants include glycine, alanine, valine, leucine, isoleucine, serine, threonine, proline, β-alanine, α-aminobutyric acid, γ-aminobutyric acid, N-methyl-β-alanine, glutamic acid, aspartic acid, etc. One or more of these can be used in combination.

[0009] Suitable acylamino acid surfactants include acyl glutamates, acyl aspartates, acyl alanines, acyl methyl alanines, and acyl glycines. The salt is not particularly limited, and examples thereof include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts and magnesium salts, inorganic salts such as aluminum salts and salts with zinc, and organic salts such as organic amine salts with ammonia, monoethanolamine, diethanolamine, and triethanolamine, and basic amino acids such as arginine and lysine. One or more of these can be used in combination. Among these, alkali metal salts are preferred, and sodium salts or potassium salts are more preferred. The blending amount of the acylamino acid surfactant is preferably from 0.1% to 50% by mass, more preferably from 1% to 45% by mass, and even more preferably from 2% to 40% by mass.

[0010] (B) Component Isomalt is an equimolar mixture of two disaccharides, specifically α-D-glucopyranosyl-1,6-sorbitol and α-D-glucopyranosyl-1,1-mannitol, obtained by reducing isomaltulose, which is obtained by enzymatic transfer of sucrose. By blending isomalt into the skin cleansing composition of the present invention, stickiness during rinsing is reduced, a smooth feeling is imparted, and the duration of the moist feeling after towel drying can be improved. The amount of isomalt blended is preferably 0.1% by mass or more and 30% by mass or less, more preferably 0.5% by mass or more and 25% by mass or less, and even more preferably 1% by mass or more and 20% by mass or less. The mass percentage of the (B) component relative to the (A) component (B / A×100) is preferably 10 mass% or more and 1000 mass% or less, more preferably 15 mass% or more and 500 mass% or less, and particularly preferably 20 mass% or more and 400 mass% or less.

[0011] (C) Component The skin cleansing composition of the present invention contains silica. The silica may be porous, hollow, or non-porous. The shape of the silica is not particularly limited, and examples include spherical, scaly, and plate-like shapes, with spherical being preferred. Note that spherical includes true spheres, nearly spherical, and spheroids, and even if the surface is uneven, the particle is considered to be "spherical" as long as the overall shape of the particle can be determined to be spherical. The spherical silica is not limited to true spheres, and silica with an ellipticity ratio (major axis / minor axis) of 1.5 or less is preferred, more preferably 1.2 or less, and even more preferably 1.1 or less. The volume average particle size of the silica is preferably 1 μm or more, and more preferably 2 μm or more and 30 μm or less. Two or more types of silica having different shapes, volume average particle sizes, etc. may be mixed and used. The blend amount of component (C) is preferably from 0.01 to 10% by mass, more preferably from 0.1 to 8% by mass, and particularly preferably from 0.5 to 6% by mass. The mass percentage of the component (C) relative to the component (A) (C / A×100) is preferably from 1 mass % to 80 mass %, particularly preferably from 5 mass % to 50 mass %.

[0012] The skin cleansing composition of the present invention may contain anionic surfactants, amphoteric surfactants, cationic surfactants, and nonionic surfactants as optional components other than (A) to (C), as long as they do not adversely affect the effects of the present invention. Furthermore, in addition to (A) to (C), the skin cleansing composition of the present invention may contain alcohols, polyhydric alcohols, sugars, sugar alcohols, clay minerals, thickeners, colorants, excipients, pigments, inorganic powders, plant extracts, pH adjusters, salts, preservatives, sequestering agents, fragrances, etc. Furthermore, other medicinal ingredients and physiologically active ingredients may be contained.

[0013] 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, erythrose, erythritol, xylose, xylitol, sucrose, lactose, lactitol, difructose anhydride, methyl gluceth-10, PPG-10 methyl glucose, and glycereth-26.

[0014] Examples of preservatives include methylparaben and ethylparaben. Examples of the sequestering agent include disodium ethylenediaminetetraacetate, edetic acid, and edetate salts such as sodium edetate. Examples of clay minerals include bentonite and kaolin. Examples of thickeners include carbomer. Examples of medicinal ingredients include vitamin C compounds 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 saxifrage extract; skin activators such as royal jelly and beech extract; blood circulation promoters such as capsaicin, zingerone, cantharides tincture, caffeine, tannic acid, and γ-oryzanol; anti-inflammatory agents such as glycyrrhizinic acid derivatives and azulene; and lysozyme chloride.

[0015] The skin cleansing composition of the present invention may be in any of the following forms: gel, cream, liquid, powder, solid, aerosol, pump foam, wipe-off type, etc., and can be used as a face wash, body cleanser, etc. The skin cleansing compositions of the present invention can be applied to the skin directly or after lathering by applying to the skin, cleansing the skin, and then rinsing or wiping off. [Example]

[0016] Skin cleansing compositions were obtained by mixing and stirring the components according to the formulations shown in Tables 1 to 3. The isomalt was mixed with water and dissolved at 85° C. or higher to prepare a mixed solution. The obtained skin cleansing compositions were evaluated for stickiness during rinsing, smoothness after rinsing, moisturization after towel drying, and durability of the moisturization, using the following methods.

[0017] <Evaluation method> The evaluation was carried out by a panel of 10 experienced sensory experts according to the following procedure. (1) Washing your face 2 g of the skin cleansing composition was placed in the palm of the hand and applied to the entire face in a massaging motion for 30 seconds. (2) Evaluation of stickiness After washing the face, participants rinsed four times in a circular motion with water in their palms, and the feeling of stickiness when touching their cheeks was evaluated by sensory evaluation. The results of the evaluation, "absence of stickiness when rinsing," are shown in the table with the symbols "◎, ○, △, ×." The evaluation criteria are as follows: 1 point: Sticky 2 points: Slightly slimy 3 points: Almost no stickiness 4 points: No stickiness The average score of the 10 judges was calculated and expressed as follows: 1.0 or more but less than 1.5: ×, 1.5 or more but less than 2.5: △, 2.5 or more but less than 3.5: 〇, and 3.5 or more but less than 4.0: ◎. The rating "◎" indicates the least sticky feeling during rinsing and is excellent.

[0018] (3) Evaluation of smoothness The smooth feeling was judged by sensory evaluation of the smoothness of the skin when touched with fingers immediately after rinsing. The term "smooth feeling" refers to the state in which, when the skin is wet immediately after rinsing, the fingers can move smoothly and glide over the skin, that is, the state in which the fingers can move without any resistance. It can also be said that the feeling is not sticky, slimy, or catching due to friction. In the table, the evaluation results for "smooth feeling after rinsing" are listed with "◎, ○, △, ×". The evaluation criteria are as follows: 1 point: Not smooth (feels sticky or sticky) 2 points: Almost no slippery feeling (slightly sticky or sticky feeling) 3 points: Slightly smooth (almost no stickiness or stickiness) 4 points: Smooth feeling (not sticky or sticky) The average score of the 10 judges was calculated and expressed as follows: 1.0 or more but less than 1.5: ×, 1.5 or more but less than 2.5: △, 2.5 or more but less than 3.5: 〇, and 3.5 or more but less than 4.0: ◎. The rating "◎" indicates the most excellent smooth feeling.

[0019] (4) Evaluation of moisturizing sensation After rinsing, the remaining moisture on the face was removed with a towel, and the moist feeling of the skin was judged by sensory evaluation immediately after and five minutes later. Moist feeling refers to the state in which the face feels moist when touched with the fingers, and there is no dry feeling that pulls on the skin. The table shows the results of the evaluation as "durability of moist feeling" with "◎, ○, △, ×". The evaluation criteria for moist feeling are as follows: 1 point: No moist feeling 2 points: Almost no moist feeling 3 points: Slightly moist feeling 4 points: Feels moist The average score of the 10 judges was calculated and expressed as follows: 1.0 or more but less than 1.5: ×, 1.5 or more but less than 2.5: △, 2.5 or more but less than 3.5: 〇, and 3.5 or more but less than 4.0: ◎. The rating "◎" indicates the most moist feeling and is excellent.

[0020] [Table 1]

[0021] [Table 2]

[0022] [Table 3]

[0023] Compared to the skin cleansing compositions of Comparative Examples 1 to 10, the skin cleansing compositions of Examples 1 to 10 of the present invention were skin cleansing compositions that were not sticky when rinsing, left a smooth feeling, left a moist feeling after towel drying, and provided a lasting moist feeling.

[0024] An example of a prescription is shown below. Prescription example 1: Facial cleansing powder Ingredients Amount (mass%) N-Coconut oil fatty acid acyl glutamate sodium 35 Sodium N-lauroyl aspartate 5 Poly-gamma sodium glutamate 4 L-Serine 4 Isomalt 20 Glucose 10 Silica 3 Branched glucan with cyclic structure 1 Polydextrose 1 Talc Residue

Claims

1. A skin cleansing composition characterized by containing the following components (A) to (C): (A) Acylamino acid surfactant (B) Isomalt 1% by mass or more (C) Silica

2. 2. The skin cleansing composition according to claim 1, comprising, as component (A), one or more of acyl glutamate, acylaspartate, acylalanine salt, acylmethylalanine salt, and acylglycine salt.

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