JP2026002860A - Skin cosmetic composition - Google Patents

Abstract

[Problem] To provide a skin cosmetic composition that provides moist feeling to the skin and maintains the moist feeling, has excellent effects of improving rough skin and inhibiting pigmentation, and also reduces sticky feeling on the skin.
[Solution]
(A) maltotetraose,
(B) a skin cosmetic composition containing panthenol,
The skin cosmetic composition is characterized in that the mass ratio [(A)/(B)] of the content of the component (A) to the content of the component (B) is 1 or more and 50 or less.
[Selection diagram] None

Description

The present invention relates to a skin cosmetic composition.

Dry skin is prone to becoming rough, with redness and rough skin texture caused by external stimuli such as scratching. It is also known that rough skin accelerates the progression of pigmentation. To resolve these skin problems caused by dry skin, it is necessary to approach skin moisturization, improve rough skin, and inhibit pigmentation.

For example, Patent Document 1 proposes a skin topical composition containing the moisturizing ingredient maltooligosaccharide. Generally, the more moisturizing the ingredient, the more moist the skin feels, but the stickier the skin feels, creating issues with the feel when used. Powdered ingredients such as silica are commonly used to suppress this stickiness, but they have low solubility and can cause formulation problems such as precipitation and cloudiness.

Therefore, a skin cosmetic composition that provides excellent moisturizing effect on the skin, maintains that moist feeling, improves rough skin, and inhibits pigmentation, while also reducing stickiness on the skin, has not yet been provided, and there is currently a strong demand for its prompt development.

WO 08/047709

One aspect of the present invention aims to provide a skin cosmetic composition that provides a moist feeling on the skin and maintains that feeling, has excellent effects in improving rough skin, and inhibits pigmentation, while also reducing stickiness on the skin.

A skin cosmetic composition according to one embodiment of the present invention contains (A) maltotetraose and (B) panthenol, and the mass ratio of the content of the component (A) to the content of the component (B) [(A)/(B)] is 1 or more and 50 or less.

The means for solving the above problems are as follows.
<1>
(A) maltotetraose,
(B) a skin cosmetic composition containing panthenol,
The skin cosmetic composition is characterized in that the mass ratio [(A)/(B)] of the content of the component (A) to the content of the component (B) is 1 or more and 50 or less.
<2>
the content of the component (A) is 0.5% by mass or more and 5.0% by mass or less, based on the total amount of the skin cosmetic composition;
The skin cosmetic composition according to <1>, wherein the content of the component (B) is 0.05% by mass or more and 0.8% by mass or less, based on the total amount of the skin cosmetic composition.

One aspect of the present invention provides a skin cosmetic composition that provides a moist feeling on the skin that lasts for a long time, has excellent effects in improving rough skin, and inhibits pigmentation, while also reducing stickiness on the skin.

(Skin cosmetic composition)
The skin cosmetic composition according to an embodiment of the present invention (hereinafter sometimes referred to as "this embodiment") contains (A) maltotetraose and (B) panthenol, and may contain other ingredients as necessary.

In this specification, (A) maltotetraose may be referred to as "component (A)" or "(A)," and (B) panthenol may be referred to as "component (B)" or "(B)."

<(A) Maltotetraose>
The maltotetraose (A) imparts moisturizing effect to the skin and pigmentation inhibiting effect to the skin cosmetic composition.

The content of component (A) is not particularly limited and can be selected appropriately depending on the purpose. However, from the viewpoint of improving the sustained moist feeling, non-stickiness, and pigmentation inhibitory effect on the skin after use of the skin cosmetic composition, the content is preferably 0.5% by mass or more and 5.0% by mass or less, and more preferably 1.0% by mass or more and 4.0% by mass or less, of the total amount of the skin cosmetic composition.

When the content of component (A) is 0.5% by mass or more relative to the total amount of the skin cosmetic composition, the skin will have a moist feeling after use and will have a good pigmentation suppression effect.

When the content of component (A) is 5.0% by mass or less relative to the total amount of the skin cosmetic composition, the skin does not feel sticky after use.

The component (A) may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available products of component (A) include Leoguard MT (manufactured by Lion Specialty Chemicals Co., Ltd.) and Tetrap (manufactured by Nagase Vita Co., Ltd.).

<(B) Panthenol>
The (B) panthenol imparts moist feeling to the skin and effects of improving rough skin to the skin cosmetic composition.

The content of component (B) is not particularly limited and can be selected appropriately depending on the purpose. However, from the viewpoint of improving the durability of moist feeling on the skin after use of the skin cosmetic composition, the lack of stickiness, and the effect of improving rough skin, the content is preferably 0.05% by mass or more and 0.8% by mass or less, and more preferably 0.1% by mass or more and 0.5% by mass or less, of the total amount of the skin cosmetic composition.

When the content of component (B) is 0.05% by mass or more relative to the total amount of the skin cosmetic composition, the skin feels moisturized after use and the skin roughness improvement effect is excellent.

When the content of component (B) is 0.8% by mass or less relative to the total amount of the skin cosmetic composition, the skin does not feel sticky after use.

The component (B) may be synthesized as appropriate, or a commercially available product may be used. An example of a commercially available product of component (B) is D-pantothenyl alcohol (Panthenol, manufactured by BASF Japan Ltd.).

In the skin cosmetic composition of this embodiment, from the viewpoint of improving the sustained moist feeling and non-stickiness of the skin after use of the skin cosmetic composition, the mass ratio [(A)/(B)] of the content of the component (A) to the content of the component (B) is 1 or more and 50 or less, preferably 8.0 or more and 40.0 or less, and more preferably 10 or more and 20 or less.

When the mass ratio [(A)/(B)] is 1 or greater, the skin will have a long-lasting moist feeling and will not feel sticky after use of the skin cosmetic composition.

When the mass ratio [(A)/(B)] is 50 or less, the skin will retain a moist feeling for a long time and will not feel sticky after use of the skin cosmetic composition.

<Other ingredients>
In addition to the component (A) and the component (B), the skin cosmetic composition may contain other components that are typically used in skin cosmetic compositions, etc., as needed, within a range that does not impair the effects of this embodiment.

The other ingredients are not particularly limited and can be selected appropriately depending on the purpose. Examples include surfactants, water-soluble polymers, oils, silicones, alcohols, lanolin derivatives, protein derivatives, amino acids, vitamins and other pharmaceuticals, disinfectants, preservatives, pH adjusters, antioxidants, sequestering agents, animal and plant extracts or derivatives thereof, chelating agents, moisturizers other than component (A), thickeners, UV absorbers or scattering agents, dyes, pigments, and water-insoluble polymer compound powders.

<<Surfactants>>
Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants.

<<<Anionic surfactants>>>
The anionic surfactant is not particularly limited and can be appropriately selected depending on the purpose, but is preferably a higher fatty acid salt, a polyoxyethylene alkyl ether sulfate, or an ether carboxylic acid or a salt thereof, and more preferably a higher fatty acid salt. These may be used alone or in combination of two or more.

- Higher fatty acid salts -
The higher fatty acid salt is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include laurate, myristate, palmitate, stearate, etc. Among these, laurate, myristate, and palmitate are preferred.

The counter ion in the higher fatty acid salt of the anionic surfactant is not particularly limited and can be selected appropriately depending on the purpose. Examples include alkali metal ions, ammonium ions, alkanolamines, and basic amino acids.

Examples of the alkali metal ions include sodium ions and potassium ions. Examples of the alkanolamines include monoethanolamine, diethanolamine, and triethanolamine. Examples of the basic amino acids include lysine and arginine.

The higher fatty acid salt can be blended as a higher fatty acid salt, but the higher fatty acid and the salt that serves as the counter ion can also be added separately to a blending tank and neutralized to form the higher fatty acid salt.

The higher fatty acid used to prepare the higher fatty acid salt may be appropriately synthesized or may be a commercially available product. Examples of commercially available higher fatty acids include NAA (registered trademark)-122 (lauric acid, manufactured by NOF Corporation), NAA-142 (myristic acid, manufactured by NOF Corporation), NAA-160 (palmitic acid, manufactured by NOF Corporation), and NAA-180 (stearic acid, manufactured by NOF Corporation).

The higher fatty acid salt may be synthesized as appropriate, or a commercially available product may be used. Examples of commercially available higher fatty acid salts include NIKKOL potassium laurate LK-120 (potassium laurate, manufactured by Nikko Chemicals Co., Ltd.), NIKKOL potassium myristate MK-140 (potassium myristate, manufactured by Nikko Chemicals Co., Ltd.), and TYSOAP MNK-40 (liquid blend of potassium coconut oil fatty acid and potassium myristate, manufactured by Nikko Chemicals Co., Ltd.).

-Polyoxyethylene (POE) alkyl ether sulfate-
The polyoxyethylene alkyl ether sulfate is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A1): The polyoxyethylene alkyl ether sulfate may be used alone or in combination of two or more thereof.

In the general formula (A1), R ¹ represents an alkyl group, and the alkyl group moiety preferably has 10 to 14 carbon atoms.

In the general formula (A1), n represents the average number of moles of ethylene oxide (E.O.) added, and the average number of moles of ethylene oxide added is preferably 1 to 5.

In the general formula (A1), X represents an alkali metal or ammonium. The alkali metal is not particularly limited and can be appropriately selected depending on the purpose. Examples include sodium and potassium.

Specific examples of the polyoxyethylene alkyl ether sulfate include polyoxyethylene (1) sodium lauryl ether sulfate, polyoxyethylene (2) sodium lauryl ether sulfate (also known as POE (2) sodium laureth sulfate), polyoxyethylene (3) sodium lauryl ether sulfate (also known as POE (3) sodium laureth sulfate), polyoxyethylene (4) sodium lauryl ether sulfate, polyoxyethylene (5) sodium lauryl ether sulfate, polyoxyethylene (3) sodium alkyl (C12,13) ether sulfate, polyoxyethylene (2) lauryl ether ammonium sulfate, and polyoxyethylene (3) lauryl ether ammonium sulfate. The numbers in parentheses indicate the average number of moles (n) of ethylene oxide (E.O.) added.

-Ether carboxylic acid or its salt-
The ether carboxylic acid or salt thereof is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include compounds represented by the following general formula (A2) or general formula (A3): The ether carboxylic acid or salt thereof may be used alone or in combination of two or more.

In the general formulae (A2) and (A3), ^R2 represents a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms, or a phenyl group substituted with a linear or branched alkyl or alkenyl group having 5 to 23 carbon atoms. The number of carbon atoms in the ^R2 moiety is preferably 10 to 14.

In the general formula (A2), R ³ may be the same or different and represents an alkylene group having 2 to 4 carbon atoms, preferably 2 carbon atoms.

In the general formula (A2), o represents the average number of moles of alkylene oxide added, ranging from 1 to 20. The average number of moles of alkylene oxide added is preferably 1 to 5.

In the general formulae (A2) and (A3), M ¹ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or a basic amino acid.

Among these, polyoxyalkylene alkyl ether carboxylic acids or salts thereof are preferred. As the polyoxyalkylene alkyl ether carboxylic acid or salt thereof, polyoxyethylene (POE) alkyl ether acetate is preferred.

The ether carboxylate salt may be synthesized as appropriate or may be a commercially available product. Commercially available ether carboxylates include, for example, trade names such as Energicol EC-30 (manufactured by Lion Specialty Chemicals Co., Ltd.; polyoxyethylene (3) lauryl ether sodium acetate), Viewrite LCA-25F (polyoxyethylene (3) lauryl ether sodium acetate), Viewrite LCA-30D (polyoxyethylene (3) lauryl ether sodium acetate), Viewrite LCA-H (polyoxyethylene (4) lauryl ether acetic acid), Viewrite LCA-25NH (laureth-4 carboxylic acid), Viewrite SHAA (sodium lauryl glycol carboxylate), Viewrite LCA (polyoxyethylene (3) lauryl ether sodium acetate) (all manufactured by Sanyo Chemical Industries, Ltd.), Kaoakipo RLM-45NV (polyoxyethylene (4.5) lauryl ether sodium acetate), and Kaoakipo RLM-100NV (polyoxyethylene (10) lauryl ether sodium acetate) (all manufactured by Kao Corporation). The numbers in parentheses indicate the average number of moles (o) of alkylene oxide added.

The content of the anionic surfactant is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 1.0% by mass or more and 25% by mass or less, and more preferably 3% by mass or more and 7% by mass or less, relative to the total amount of the skin cosmetic composition.

<<<Cationic surfactants>>>
The cationic surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include alkylamine salts, fatty acid amide amine salts, alkyltrimethylammonium salts, dialkyldimethylammonium salts, alkyldimethylbenzylammonium salts, etc. These may be used alone or in combination of two or more.

<<<Amphoteric surfactants>>>
The amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include betaine-type amphoteric surfactants and amino acid-type amphoteric surfactants. Among these, betaine-type amphoteric surfactants are preferred. These may be used alone or in combination of two or more.

The betaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include alkylbetaine-type amphoteric surfactants, amidobetaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants, and imidazolinium betaine-type amphoteric surfactants. These may be used alone or in combination of two or more.

The alkyl betaine amphoteric surfactant is not particularly limited and can be selected appropriately depending on the purpose. Examples include lauryl dimethyl amino acetic acid betaine, coconut oil alkyl betaine, and stearyl dimethyl amino acetic acid betaine. These may be used alone or in combination of two or more.

The amidobetaine amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauric acid amidopropyl betaine, coconut oil fatty acid amidopropyl betaine, and palm kernel oil fatty acid amidopropyl betaine. These may be used alone or in combination of two or more.

The sulfobetaine-type amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, coconut oil fatty acid dimethylamino hydroxysulfobetaine, and lauryl dimethylamino hydroxysulfobetaine. These may be used alone or in combination of two or more.

The imidazolinium betaine amphoteric surfactant is not particularly limited and can be appropriately selected depending on the purpose. Examples include N-lauroyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, N-coconut oil fatty acid acyl-N'-carboxymethyl-N'-hydroxyethylethylenediamine sodium, and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine. These may be used alone or in combination of two or more.

Among these, amidobetaine-type amphoteric surfactants and alkylbetaine-type amphoteric surfactants are preferred, with lauric acid amidopropyl betaine and lauryldimethylaminoacetic acid betaine being more preferred, and lauric acid amidopropyl betaine being even more preferred.

The content of the amphoteric surfactant is not particularly limited and can be selected appropriately depending on the purpose, but is preferably 2% by mass or more and 15% by mass or less, more preferably 3% by mass or more and 10% by mass or less, and even more preferably 4% by mass or more and 10% by mass or less, relative to the total amount of the skin cosmetic composition.

The amphoteric surfactant may be synthesized as appropriate or commercially available. Commercially available amphoteric surfactants include, for example, alkyl betaine amphoteric surfactants under the trade names Amphitol 24B (lauryl dimethylaminoacetic acid betaine, manufactured by Kao Corporation), Nissan Anon (registered trademark) BL (lauryl dimethylaminoacetic acid betaine, manufactured by NOF Corporation), NIKKOL AM-301 (lauryl dimethylaminoacetic acid betaine, manufactured by Nikko Chemicals Co., Ltd.), Amogene (registered trademark) S (lauryl dimethylaminoacetic acid betaine, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and Amogene S-H (lauryl dimethylaminoacetic acid betaine, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.); Energicol L-30B (lauric acid amidopropyl betaine, manufactured by Lion Specialty Chemicals Co., Ltd.), Nissan Anon BDF (registered trademark)-SF (coconut oil fatty acid amidopropyl betaine, manufactured by NOF Corporation), and Obazoline. Examples of suitable surfactants include amidobetaine-type amphoteric surfactants such as CAG-30 (coconut oil fatty acid amidopropyl betaine, manufactured by Toho Chemical Industry Co., Ltd.); sulfobetaine-type amphoteric surfactants such as Amphitol 20HD (lauryl hydroxysulfobetaine, manufactured by Kao Corporation) and Softazoline LSB (lauramidopropyl hydroxysultaine, manufactured by Kawaken Fine Chemicals Co., Ltd.); and imidazoline-type amphoteric surfactants such as NIKKOL AM-101 (2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, manufactured by Nikko Chemicals Co., Ltd.) and Nissan Anon GLM-R-LV (2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, manufactured by NOF Corporation).

In addition to the above, alkylamine oxide compounds can also be used as the amphoteric surfactant.

The alkylamine oxide compound is not particularly limited and can be selected appropriately depending on the purpose. Examples include alkyldimethylamine oxide and dihydroxyethyllaurylamine oxide. Examples of the alkyldimethylamine oxide include lauryldimethylamine oxide, myristyldimethylamine oxide, coconut alkyldimethylamine oxide, and oleyldimethylamine oxide. Of these, lauryldimethylamine oxide is preferred. These compounds may be used alone or in combination of two or more.

The content of the alkylamine oxide compound is preferably 1% by mass or more and 4% by mass or less, and more preferably 1% by mass or more and 3% by mass or less, relative to the total amount of the skin cosmetic composition.

<<<Nonionic surfactants>>>
The nonionic surfactant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, glycerin fatty acid esters, sorbitan fatty acid esters, polyglycerin fatty acid esters, sucrose fatty acid esters, alkyl polyglycosides, and polyoxyethylene polyoxypropylene glycols. These may be used alone or in combination of two or more.

<<Oil content>>
The oil is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include vegetable oils and fats such as castor oil, olive oil, cacao oil, hardened palm oil, camellia oil, coconut oil, Japan wax, jojoba oil, grapeseed oil, and avocado oil, and ester compounds thereof; animal oils and fats such as mink oil and egg yolk oil; waxes such as beeswax, spermaceti, lanolin, hydrogenated lanolin, carnauba wax, and candelilla wax; hydrocarbons such as liquid paraffin, squalane, microcrystalline wax, ceresin wax, paraffin wax, and petrolatum; natural and synthetic fatty acids such as oleic acid, isostearic acid, and behenic acid; and esters such as glycerol tri-2-ethylhexanoate, 2-ethylhexyl stearate, butyl stearate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, octyldodecyl oleate, and cholesterol oleate. These may be used alone or in combination of two or more.

The content of the oil is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 3% by mass or less relative to the total amount of the skin cosmetic composition.

<<Alcoholic beverages>>
The alcohols are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include natural and synthetic higher alcohols such as cetyl alcohol, oleyl alcohol, stearyl alcohol, hexyldecanol, octyldodecanol, lauryl alcohol, etc. These may be used alone or in combination of two or more.

The content of the alcohols is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.01% by mass or more and 15% by mass or less relative to the total amount of the skin cosmetic composition.

<<Moisturizing agents other than component (A)>>
The moisturizer other than the component (A) is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include isoprene glycol, 1,2-pentanediol, diethylene glycol, diethylene glycol monoalkyl ether, polypropylene glycol, hydrogenated castor oil (30 E.O.), diglycerin, triglycerin, polyglycerin, etc. These may be used alone or in combination of two or more.

The content of the moisturizer other than component (A) is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 10.0% by mass or less relative to the total amount of the skin cosmetic composition.

<<Preservatives>>
The preservative is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include benzoates, sorbates, dehydroacetates, parahydroxybenzoates, 2,4,4'-trichloro-2'-hydroxydiphenyl ether, 3,4,4'-trichlorocarbanilide, benzalkonium chloride, hinokitiol, resorcinol, methylchloroisothiazolinone-methylisothiazolinone solution (trade name: Kason CG, manufactured by Rohm and Haas Japan Co., Ltd.), salicylic acid, pentanediol, phenoxyethanol, and ethanol. These may be used alone or in combination of two or more.

The content of the preservative is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 1.0% by mass or less relative to the total amount of the skin cosmetic composition.

<<Antioxidants>>
The antioxidant is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include dibutylhydroxytoluene, butylhydroxyanisole, ascorbic acid, etc. These may be used alone or in combination of two or more.

The content of the antioxidant is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 1.0% by mass or less relative to the total amount of the skin cosmetic composition.

<<Chelating Agents>>
The chelating agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include edetic acid, edetate disodium, ethylenediaminetetraacetate, hexametaphosphate, gluconic acid, etc. These may be used alone or in combination of two or more.

The content of the chelating agent is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.1% by mass or more and 1.0% by mass or less relative to the total amount of the skin cosmetic composition.

<<pH adjuster>>
The pH adjuster is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include sodium hydroxide, potassium hydroxide, citric acid, succinic acid, triethanolamine, aqueous ammonia, triisopropanolamine, phosphoric acid, glycolic acid, etc. These may be used alone or in combination of two or more.

<<Ultraviolet absorber or scattering agent>>
The ultraviolet absorber or scattering agent is not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include 2-hydroxy-4-methoxybenzophenone, octyl dimethyl para-aminobenzoate, ethylhexyl para-methoxycinnamate, titanium oxide, kaolin, talc, etc. These may be used alone or in combination of two or more.

The content of the ultraviolet absorber or scattering agent is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.01% by mass or more and 1.0% by mass or less relative to the total amount of the skin cosmetic composition.

<<Vitamins>>
The vitamins are not particularly limited and can be appropriately selected depending on the purpose, and examples thereof include vitamin A, B vitamins, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, vitamin U, carnitine, ferulic acid, γ-oryzanol, α-lipoic acid, and orotic acid and derivatives thereof. These may be used alone or in combination of two or more.

The content of the vitamins is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.001% by mass or more and 0.5% by mass or less relative to the total amount of the skin cosmetic composition.

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

The content of the amino acids is not particularly limited and can be selected appropriately depending on the purpose, but it is preferably 0.001% by mass or more and 0.5% by mass or less relative to the total amount of the skin cosmetic composition.

The other ingredients may be synthesized as appropriate, or commercially available products may be used. There are no particular restrictions on the content of the other ingredients relative to the total amount of the skin cosmetic composition, and the content may be selected appropriately depending on the purpose.

<pH>
The pH of the skin cosmetic composition at 25° C. is preferably 4.0 to 9.0, and more preferably 4.5 to 6.0 from the viewpoint of suppressing skin irritation.

The method for measuring the pH of the skin cosmetic composition is not particularly limited, but examples include a method using a glass electrode color hydrogen ion concentration indicator HM-30R (manufactured by DKK-TOA Corporation, electrode type GST-5721).

<Viscosity>
The viscosity of the skin cosmetic composition at 25°C is not particularly limited and can be appropriately selected depending on the purpose. However, if the skin cosmetic composition is liquid, the viscosity is preferably 1 mPa·s or more and 50 mPa·s or less, and if the skin cosmetic composition is semi-solid, the viscosity is preferably 1 mPa·s or more and 150 mPa·s or less.

The method for measuring the viscosity of the skin cosmetic composition is not particularly limited, but examples include a method using a BM-type viscometer (manufactured by Tokyo Keiki Co., Ltd.) to measure the viscosity after 1 minute at a sample temperature of 25°C, a rotation speed of 60 rpm, and a No. 3 rotor, and a method using a Brookfield viscometer BHII-type (manufactured by Toki Sangyo Co., Ltd.) to measure the viscosity after 1 minute at a sample temperature of 25°C, a rotation speed of 10 rpm, and a No. 7 rotor.

<Method for producing skin cosmetic composition>
The method for producing the skin cosmetic composition is not particularly limited and can be appropriately selected depending on the purpose, and can be obtained by mixing the component (A), the component (B), and, if necessary, the other components, and purified water (blended as the remainder so that the total skin cosmetic composition becomes 100% by mass). Specifically, the skin cosmetic composition can be produced by dissolving the component (A) and the component (B) in purified water heated to 70°C to 80°C, and then cooling the water to 40°C or below.

The skin cosmetic composition may be prepared using an apparatus. There are no particular limitations on the type of apparatus and it can be selected appropriately depending on the purpose. For example, it may be a stirring apparatus equipped with stirring blades that exert shear force and can mix the entire composition. There are no particular limitations on the type of stirring blade and it can be selected appropriately depending on the purpose. For example, it may be a propeller, turbine, or disperser.

<Application>
The application area and method of the skin cosmetic composition are not particularly limited and can be appropriately selected depending on the purpose. For example, the composition can be applied to the whole body, face, hands, arms, legs, etc. in a usual manner.

The uses of the skin cosmetic products are not particularly limited and can be selected appropriately depending on the purpose. Examples include lotions, emulsions, body creams, antiperspirants, deodorants, shampoos, rinses, treatments, body soaps, oil essences, and hand soaps.

The present embodiment will be described in more detail below based on examples and comparative examples, but the present invention is not limited to these examples. Furthermore, the content of each component described in the examples and comparative examples is expressed in "mass %," and all values are converted to pure content.

(Examples 1 to 12 and Comparative Examples 1 to 4)
Skin cosmetic compositions having the compositions and contents shown in Examples 1 to 12 and Comparative Examples 1 to 4 in Tables 1 to 3 were prepared according to the following method. Specifically, purified water was heated to 70°C to 80°C, and then component (A) and component (B) were dissolved therein and cooled to 40°C or below. Purified water was added so that the total amount was 100% by mass, thereby obtaining the skin cosmetic compositions of the Examples and Comparative Examples. The components were mixed by stirring using a propeller as the stirring blade and a Three-One Motor (HEIDON BL1200, manufactured by Shinto Chemical Co., Ltd.).

Each skin cosmetic composition was evaluated and judged for its "skin moisturizing feeling," "skin moisturizing duration," "non-stickiness," "effect on improving rough skin," and "effect on inhibiting pigmentation." The results are shown in Tables 1 to 3 below.

<Evaluation of skin moisturizing feeling>
After bathing before going to bed, five expert panelists rubbed 0.5 g of each skin cosmetic composition into their faces and evaluated the moist feeling immediately afterward based on the following evaluation criteria. The average scores of the five expert panelists were calculated and judged based on the following criteria. "A" and "◯" were considered acceptable.
-Evaluation criteria for moist feeling-
5 points: Very moist 4 points: Moist 3 points: Slightly moist 2 points: Not very moist 1 point: Not moist at all - Moisture evaluation criteria -
◎: Average evaluation score is 4.0 points or more. ○: Average evaluation score is 3.0 points or more and less than 4.0 points. △: Average evaluation score is 2.0 points or more and less than 3.0 points. ×: Average evaluation score is less than 2.0 points.

<Evaluation of skin moisturizing duration>
After bathing before going to bed, five expert panelists rubbed 0.5 g of each skin cosmetic composition into their faces and evaluated the moist feeling the next morning based on the following evaluation criteria. The average scores of the five expert panelists were calculated and judged based on the following criteria. "A" and "◯" were considered to be acceptable.
-Evaluation criteria for sustained moist feeling-
5 points: Very moist 4 points: Moist 3 points: Slightly moist 2 points: Not very moist 1 point: No moist feeling at all - Criteria for determining moist feeling duration -
◎: Average rating is 4.0 points or more. ○: Average rating is 3.0 points or more and less than 4.0 points. △: Average rating is 2.0 points or more and less than 3.0 points. ×: Average rating is less than 2.0 points.

<Evaluation of non-sticky feeling on skin>
After bathing before going to bed, five expert panelists rubbed 0.5 g of each skin cosmetic composition onto their faces and evaluated the stickiness immediately afterward based on the following evaluation criteria. The average scores of the five expert panelists were calculated and evaluated based on the following criteria. "A" and "B" were considered acceptable.
- Evaluation criteria for stickiness -
5 points: No stickiness at all 4 points: Very little stickiness 3 points: Slight stickiness 2 points: Stickiness 1 point: Very sticky - Criteria for stickiness -
◎: Average rating is 4.0 points or more. ○: Average rating is 3.0 points or more and less than 4.0 points. △: Average rating is 2.0 points or more and less than 3.0 points. ×: Average rating is less than 2.0 points.

<Evaluation of rough skin improvement effect>
A 30% aqueous solution of SDS (Sodium Dodecyl Sulfate) was applied to the forearms of three dry skin panelists to induce mildly rough skin. An appropriate amount of each skin cosmetic composition was applied twice daily, in the morning and evening, and the presence or absence of an effect on improving rough skin (redness) was evaluated according to the following evaluation criteria the day after application, and 2, 4, 7, and 10 days later. The average scores of the three dry skin panelists were calculated and evaluated according to the following evaluation criteria. "◎" and "◯" were considered to be acceptable.
-Evaluation criteria for rough skin improvement-
5 points: Redness improved the day after continuous use 4 points: Redness improved after 2 days of continuous use 3 points: Redness improved after 5 days of continuous use 2 points: Redness improved after 7 days of continuous use 1 point: Redness improved after 10 days of continuous use - Criteria for assessing the effect of improving rough skin -
◎: Average rating is 4.0 points or more. ○: Average rating is 3.0 points or more and less than 4.0 points. △: Average rating is 2.0 points or more and less than 3.0 points. ×: Average rating is less than 2.0 points.

<Evaluation of pigmentation suppression effect>
Pigmentation is thought to occur when reactive oxygen species (ROS) generated intracellularly by external stimuli such as ultraviolet rays promote the secretion of various cytokines from keratinocytes, activating melanocytes, which cause pigmentation such as age spots and dullness. Therefore, using human epidermal keratinocytes, we evaluated the ROS that cause pigmentation using the following method.

Human epidermal keratinocytes were seeded onto a 96-well plate and cultured for one day in a 37°C, 5% CO2 _incubator to prepare test cells. Each skin cosmetic composition was added to the test cells, and samples were cultured for 16, 24, 48, 72, and 96 hours. Controls were also prepared without the addition of each skin cosmetic composition. After removing the culture supernatant, a ROS detection fluorescent reagent was added and the cells were incubated for 30 minutes in a 37°C, 5% _CO2 incubator. The supernatant was then removed, and _{an H2O2} /HBSS solution was added. The cells were incubated for 1 hour in a 30°C, 5% _CO2 incubator. After removing the supernatant, HBSS was added and the cells were measured using a fluorescence detector. Three samples were used, and the average of the obtained values was used as the ROS value for that sample. "◎◎", "◎", and "◯" were considered acceptable.
-Evaluation criteria for pigmentation suppression effect-
◎◎: ROS value decreased compared to the control 16 hours after application. ◎: ROS value decreased compared to the control 24 hours after application. 〇: ROS value decreased compared to the control 48 hours after application. △: ROS value decreased compared to the control 72 hours after application. ×: ROS value decreased compared to the control 96 hours after application.

(Prescription Examples 1 to 4)
Skin cosmetic compositions for use as body creams, as shown in Formulation Examples 1 to 4 in Table 4, were prepared according to the following method. Specifically, 50% by mass of purified water and 0.2% by mass of carbomer, based on the total mass of the skin cosmetic composition, were weighed into a beaker and dissolved with stirring to obtain Mixture 1. The remaining 50% by mass of purified water and water-soluble components, such as maltotetraose, panthenol, glycerin, dipropylene glycol, hydroxyacetophenone, acrylates copolymer, 1,2-hexanediol, EDTA-2Na, and arginine, were then weighed into the vessel of a vacuum emulsification kettle and heated to 90°C to obtain Mixture 2. The resulting Mixtures 1 and 2 were dissolved with stirring to obtain Mixture 3. Oily components, such as avocado oil, olive fruit oil, ceramide NP, and cetearyl alcohol, and nonionic surfactants, such as sorbitan oleate and lecithin, were weighed into a separate beaker and dissolved with heating to 90°C to obtain Mixture 4. The obtained mixtures 3 and 4 were mixed and stirred, and then cooled under reduced pressure to prepare a skin cosmetic composition for use as a body cream.

(Prescription Examples 5-6)
The skin cosmetic compositions for use as lotions shown in Formulation Examples 5 and 6 in Table 5 were prepared according to the following method. Specifically, 50% by mass of purified water relative to the total amount of the skin cosmetic composition and 0.05% by mass of disodium EDTA were weighed into a beaker, stirred while heated to 90°C, and then cooled to 50°C to obtain Mixture 1. Thereafter, the remaining 50% by mass of purified water and the other ingredients were weighed into another beaker, stirred while heated to 50°C, and obtained Mixture 2. The obtained Mixtures 1 and 2 were mixed and stirred, and then cooled to 30°C to prepare skin cosmetic compositions for use as lotions.

(Prescription Examples 7-8)
Skin cosmetic compositions for use as oil essences, as shown in Formulation Examples 7 and 8 in Table 6, were prepared according to the following method. Specifically, 50% by mass of purified water, 0.05% by mass of xanthan gum, and 0.05% by mass of disodium EDTA relative to the total mass of the skin cosmetic composition, were weighed into a beaker and stirred while heated to 90°C, and then cooled to 50°C to obtain Mixture 1. Thereafter, the remaining 50% by mass of purified water and the other ingredients were weighed into another beaker and stirred while heated to 50°C to obtain Mixture 2. The obtained Mixtures 1 and 2 were mixed and stirred to prepare skin cosmetic compositions for use as oil essences.

Details of the ingredients used in Examples 1-12, Comparative Examples 1-4, and Formulation Examples 1-8 are shown in Tables 7-8 below.

All of the requirements of the present invention are essential for solving the problems of the present invention with the solutions provided by the present invention. However, nothing in this specification suggests that the requirements of the present invention are essential for solving problems other than those of the present invention, or for solving the problems of the present invention with solutions other than those provided by the present invention. For example, nothing in this specification denies that a skin cosmetic composition that excludes any of the requirements of the present invention set forth in the claims solves problems other than those of the present invention, or solves the problems of the present invention with solutions other than those provided by the present invention.

The skin cosmetic composition of this embodiment provides excellent moisturizing effect on the skin, its long-lasting effect, the effect of improving rough skin, and the effect of inhibiting pigmentation, while also reducing stickiness on the skin. Therefore, it can be suitably used in, for example, lotions, emulsions, body creams, antiperspirants, deodorants, shampoos, rinses, treatments, body soaps, oil essences, and hand soaps.

Claims (2)

(A) maltotetraose,
(B) a skin cosmetic composition containing panthenol,
A skin cosmetic composition characterized in that the mass ratio [(A)/(B)] of the content of the component (A) to the content of the component (B) is 1 or more and 50 or less. the content of the component (A) is 0.5% by mass or more and 5.0% by mass or less, based on the total amount of the skin cosmetic composition;
The skin cosmetic composition according to claim 1, wherein the content of the component (B) is 0.05% by mass or more and 0.8% by mass or less, based on the total amount of the skin cosmetic composition.