Cosmetics

Abstract

The present invention provides a cosmetic product containing a material that, when incorporated into the cosmetic product as an alternative particle to microplastic beads, exhibits a soft and moist texture. [Solution] Cosmetics containing 0.1 to 99.9% of divalent metal salt of alkenyl succinate starch ester have a soft and moist feel. Divalent metal salt of alkenyl succinate starch ester is preferably divalent metal salt of octenyl succinate starch ester, and calcium octenyl succinate starch ester is particularly preferred.

Description

Technical Field

[0003]

[0001] The present invention relates to a cosmetic excellent in feel, containing a divalent metal salt of alkenyl succinic acid starch ester.

Background Art

[0002] Conventionally, for makeup cosmetics such as foundation, eyeshadow, and blush, sunscreen products such as UV care products, and basic cosmetics such as emulsions and creams, in order to impart a feeling such as a smooth feeling, a smoothness, a softness, and a moist feeling, it is known to contain water-insoluble spherical plastic powders such as silicone powders, nylon powders, and acrylic powders called microplastic beads. For example, Patent Document 1 describes a cosmetic characterized by containing a composite silicone powder in which silicone rubber spherical fine particles are coated with a polyorganosilsesquioxane resin. Patent Document 2 describes nylon powder, and spherical ones are preferred in terms of the unevenness correction effect. Patent Document 3 describes a solid powder cosmetic characterized by containing spherical polymethyl methacrylate as an example of acrylic powder.

[0003] In recent years, concerns have been raised about marine pollution and adverse effects on human health caused by microplastic beads. Since microplastic beads do not decompose and remain in nature once released into the environment, there is a demand for cosmetics that do not contain microplastic beads. Cellulose, starch, and silica are examples of alternative particles to microplastic beads. Looking at conventional technologies, for example, Patent Document 4 describes a cosmetic that contains specific spherical cellulose powder and exhibits excellent effects in terms of coverage, pore blurring, natural skin feel / transparency, and smooth adhesion. Patent Document 5 describes a cream-type cosmetic that contains alkenyl succinate starch ester metal salts with a particle size of 20 μm or less and has the effect of reducing sebum stickiness and shine. Patent Document 6 describes a gel-type cosmetic that contains specific spherical silica and exhibits excellent effects in terms of freshness and a smooth feeling after application. However, these materials are not intended to be included in cosmetics as alternative particles to microplastic beads, and there is a problem that they cannot impart the softness and moist feel that microplastic beads provide. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-20631 [Patent Document 2] Japanese Patent Publication No. 2015-193564 [Patent Document 3] Japanese Patent Publication No. 2014-172864 [Patent Document 4] Japanese Patent Publication No. 2013-221000 [Patent Document 5] Japanese Patent Publication No. 2005-170864 [Patent Document 6] Japanese Patent Publication No. 2023-119501 [Overview of the project] [Problems that the invention aims to solve]

[0005] The object of the present invention is to provide a material that, when incorporated into cosmetics as a substitute particle for microplastic beads, exhibits a soft and moist texture, and a cosmetic containing that material. [Means for solving the problem]

[0006] As a result of diligent research into the aforementioned problem, the inventors of the present invention have found that a cosmetic composition containing a divalent metal salt of alkenyl succinate starch ester as an alternative particle to microplastic beads has a soft and moist feel.

[0007] One embodiment of the present invention is as follows. [Section 1] A cosmetic product containing a divalent metal salt of alkenyl succinate starch ester. [Section 2] The cosmetic composition according to item [1], wherein the content of the divalent metal salt of alkenyl succinate starch ester is 0.1 to 99.9% by weight on a basis of dry starch weight. [Section 3] The cosmetic composition according to item [1] or [2], wherein the aforementioned divalent metal salt of alkenyl succinate starch ester is a divalent metal salt of octenyl succinate starch ester. [Section 4] The cosmetic composition according to [Claim 1] or [Claim 2], wherein the metal salt of the divalent metal salt of the alkenyl succinate starch ester is one or more metal salts selected from the group consisting of calcium salts, magnesium salts, and zinc salts. [Section 5] The cosmetic composition according to [Clause 1] or [Clause 2], wherein the divalent metal salt of alkenyl succinate starch ester is octenyl succinate starch ester calcium salt. [Effects of the Invention]

[0008] According to the present invention, by including a divalent metal salt of alkenyl succinate starch ester, it is possible to provide a cosmetic composition that has a soft and moist feel even without including microplastic beads.

[0009] The embodiments for carrying out the present invention will be described in detail below. However, the present invention is not limited to the following embodiments.

[0010] In this specification, a divalent metal salt of alkenyl succinate starch ester is a compound in which one carboxyl group of alkenyl succinate forms an ester bond with the hydroxyl group of starch X, and the other carboxyl group forms a salt with a divalent metal M, as shown in general formula (1). [ka]

[0011] In formula (1), X represents a starch residue, R represents an alkenyl, and M represents a divalent metal. The divalent metal is not particularly limited, but examples include copper (divalent), iron (divalent), calcium, magnesium, zinc, and barium, and is preferably calcium, zinc, or magnesium.

[0012] In this specification, the divalent metal salt may be one or more metal salts selected from the group consisting of, for example, calcium salts, magnesium salts, and zinc salts.

[0013] In formula (1), R represents an alkenyl group, which is a monounsaturated aliphatic hydrocarbon group having 2 to 18 carbon atoms and possessing one double bond. The number of carbon atoms in the alkenyl group is preferably 4 to 14, more preferably 6 to 12. For example, it may be an octenyl group with 8 carbon atoms, represented as "-CH2CH=CH-(CH2)4-CH3".

[0014] In this specification, the alkenyl succinic acid starch ester metal salt may be a divalent metal salt of a starch ester of succinic acid having an alkenyl group with 2 to 18 carbon atoms. The succinic acid having an alkenyl group may be octenyl succinic acid, decenyl succinic acid, dodecenyl succinic acid, tetradecenyl succinic acid, hexadecenyl succinic acid, octadecenyl succinic acid, etc. Among these, as the combination of alkenyl and divalent metal, calcium octenyl succinate starch ester, zinc octenyl succinate starch ester, and magnesium octenyl succinate starch ester are preferable as cosmetic materials having a soft and moist feel. A commercially available product can be used as the alkenyl succinic acid starch ester divalent metal salt. As an example, Octie NS-1 (calcium octenyl succinate starch ester, Octie is a registered trademark) manufactured by Nisshin Chemical Co., Ltd. can be mentioned.

[0015] In this specification, the starch may be natural starch or modified starch.

[0016] Natural starch is starch obtained from natural raw materials and is starch that has not been processed enzymatically or chemically. Its origin is not particularly limited, and examples include corn starch, waxy corn starch, high amylose corn starch, rice starch, waxy rice starch, potato starch, waxy potato starch, tapioca starch, waxy tapioca starch, sweet potato starch, wheat starch, waxy wheat starch, high amylose wheat starch, kudzu starch, lotus root starch, banana starch, adzuki bean starch, pea starch, mung bean starch, etc.

[0017] Modified starch is starch obtained from natural raw materials and enzymatically or chemically processed for the purpose of improving the original physical properties of starch (such as high viscosity, gelation upon cooling, etc.). The enzymatic or chemical processing of starch may involve a single processing treatment or a combination of multiple enzymatic or chemical processing treatments. The modified starch that can be used in the present invention is not particularly limited, and examples include acetic acid starch, oxidized starch, phosphorylated starch, phosphoric acid cross-linked starch, hydroxypropyl starch, carboxymethyl starch, hydroxyethyl starch, esterified starch, graft polymerized starch, cationic starch, hydrolyzed starch, hydrolyzed hydrogenated starch, hydroxypropyl phosphorylated starch, and the like. Further, the modified starch may have a metal salt form, and examples include modified starch derivatives obtained by adding a metal salt to modified starch such as sodium acrylate graft starch and sodium octenyl succinate starch.

[0018] In the present invention, one or more surface treatment agents may be used to perform surface treatment on the divalent metal salt of alkenyl succinic acid starch ester. Examples of surface treatment include, for example, fluorine compound treatment (such as perfluoroalkyl phosphate ester treatment, perfluoroalkyl silane treatment, perfluoropolyether treatment, fluorosilicone treatment, fluorinated silicone resin treatment, etc.), silicone treatment (such as methyl hydrogen polysiloxane treatment, dimethyl polysiloxane treatment, gas-phase tetramethyltetrahydrogen cyclotetrasiloxane treatment, etc.), silicone resin treatment (such as trimethylsiloxysilicate treatment, etc.), pendant treatment (a method of adding an alkyl chain, etc. after gas-phase silicone treatment), silane coupling agent treatment, titanium coupling agent treatment, aluminum coupling agent treatment, silane treatment (such as alkylated silane or alkylated silazane treatment, etc.), oil agent treatment, polyacrylic acid treatment, metal soap treatment (such as stearate or myristate treatment, etc.), hydrogenated lecithin treatment, acrylic resin treatment, metal oxide treatment, and the like. It is also possible to use a combination of these treatments.

[0019] The content of the divalent metal salt of alkenyl succinate starch ester of the present invention in the cosmetic composition is not particularly limited, and is, for example, 0.1 to 99.9% by mass of the total amount of the cosmetic composition, preferably 0.1 to 50% by mass, and more preferably 0.1 to 20% by mass.

[0020] In addition to the divalent metal salt of alkenyl succinate starch ester of the present invention, the cosmetic composition may contain various material components used in cosmetics. Examples of such material components include pigments, ultraviolet absorbers, oils, surfactants, fluorine compounds, resins, viscosity modifiers, preservatives, fragrances, humectants, salts, solvents, antioxidants, chelating agents, neutralizing agents, pH adjusters, insect repellents, and physiologically active ingredients.

[0021] The cosmetics of the present invention are not particularly limited, but examples include cake-type makeup cosmetics such as powder foundation, eyeshadow, and blush; water-in-oil cosmetics such as liquid foundation, makeup base, and sunscreen; and oil-in-water cosmetics.

[0022] The cosmetic composition of the present invention may have any form, for example, it may be in the form of a powder, emulsion, cream, stick, spray, multilayer separation type, or any other dosage form.

[0023] The present invention will be described in more detail below with reference to examples. However, the present invention is not limited to the following examples. [Examples]

[0024] <Pressed Cake Foundation> Table 1 shows an example of a pressed cake foundation formulation. The values ​​in Table 1 represent the content (mass%) of each component, and their sum is 100% by mass. Titanium dioxide was used as the white inorganic pigment. A mixture of yellow iron oxide, red iron oxide, and brown iron oxide was used as the colored inorganic pigment. The pressed cake foundation was manufactured using the following procedure: In Table 1, component (A) was mixed first, then component (B) was added and mixed further until uniform, the mixture was passed through a sieve to standardize the particle size, and then packed into a metal dish and compressed.

[0025] <Materials used> The following commercially available products were used in the tests as microplastic beads and microplastic bead substitutes. Calcium octenyl succinate starch ester: "Octie NS-1" manufactured by Nippon Denshi Kagaku Co., Ltd. ("Octie" is a registered trademark) Aluminum starch ester octenyl succinate: "Octie" manufactured by Nippon Denshi Kagaku Co., Ltd. ("Octie" is a registered trademark) Silica: "Godball D-25C" manufactured by Suzuki Oil & Fat Industry Co., Ltd. ("Godball" is a registered trademark) Nylon powder: Toray Industries, Inc. "SP-500"

[0026] <Evaluation Method> The sensory evaluation test was conducted in the form of a questionnaire, in which 10 trained panelists evaluated the softness and moisturizing effect of the cosmetic when applied to the skin, using a rating system from 0 to 5 points. 0 was the worst rating, and 5 was the best. Table 2 shows the average scores of all panelists in the sensory evaluation test.

[0027] [Table 1]

[0028] [Table 2]

[0029] As shown in Table 2, the pressed cake foundation containing calcium octenyl succinate starch ester received extremely high evaluation scores of 4.0 or higher for both softness and moisturizing properties, demonstrating a remarkably soft and moisturizing feel despite containing microplastic bead substitute particles. On the other hand, the pressed cake foundations of Comparative Examples 1 and 2, which contained microplastic bead substitute particles other than those of the present invention, failed to produce cosmetics with superior softness and moisturizing properties.

[0030] <Oil-in-water makeup base> Table 3 shows examples of formulations for oil-in-water makeup bases. The values ​​in Table 3 represent the content (mass%) of each component, and their sum is 100% by mass. The manufacturing process was carried out using the following steps. Component A was uniformly dissolved or dispersed at 80°C. Component B was uniformly dissolved or dispersed at 80°C. The mixture of component B was mixed with the mixture of component A, emulsified, and cooled to obtain an oil-in-water type makeup base.

[0031] [Table 3]

[0032] <Testing Method> The sensory evaluation test was conducted in the form of a questionnaire, in which 10 trained panelists evaluated the softness and moisturizing effect of the cosmetic when applied to the skin, using a rating system from 0 to 5 points. 0 was the worst rating, and 5 was the best. Table 4 shows the average scores of all panelists in the sensory evaluation test.

[0033] [Table 4]

[0034] As shown in Table 4, the oil-in-water makeup base containing calcium octenyl succinate starch ester scored extremely high marks of 4.0 or higher for both softness and moisturizing properties, demonstrating a superior softness and moisturizing feel despite containing microplastic bead substitute particles. On the other hand, Comparative Examples 4 and 5, which contained microplastic bead substitute particles other than those of the present invention, failed to produce cosmetics with superior softness and moisturizing properties.

[0035] <Emulsion> Table 5 shows examples of formulations for oil-in-water makeup bases. The values ​​in Table 5 represent the content (mass%) of each component, and their sum is 100% by mass. The manufacturing process was carried out using the following steps. Component A was uniformly mixed and dissolved. The aqueous component was gradually added to the heated component B while stirring the oil component with a homogenizer, emulsified, and then cooled to obtain an emulsion.

[0036] [Table 5]

[0037] <Testing Method> The sensory evaluation test was conducted in the form of a questionnaire, in which 10 trained panelists evaluated the softness and moisturizing effect of the cosmetic when applied to the skin, using a rating system from 0 to 5 points. 0 was the worst rating, and 5 was the best. Table 6 shows the average scores of all panelists in the sensory evaluation test.

[0038] [Table 6]

[0039] As shown in Table 6, the emulsion containing calcium octenyl succinate starch ester received extremely high evaluation scores of 4.0 or higher for both softness and moisturizing properties, demonstrating a remarkably soft and moisturizing feel despite containing microplastic bead substitute particles. On the other hand, the emulsions of Comparative Examples 7 and 8, which contained microplastic bead substitute particles other than those of the present invention, failed to produce cosmetics with superior softness and moisturizing properties.

Claims

1. Cosmetics containing divalent metal salts of alkenyl succinate starch ester.

2. The cosmetic composition according to claim 1, wherein the content of the divalent metal salt of alkenyl succinate starch ester is 0.1 to 99.9% by weight on a basis of dry starch weight.

3. The cosmetic composition according to claim 1 or 2, wherein the divalent metal salt of the alkenyl succinate starch ester is a divalent metal salt of octenyl succinate starch ester.

4. The cosmetic composition according to claim 1 or 2, wherein the metal salt of the divalent metal salt of the alkenyl succinate starch ester is one or more metal salts selected from the group consisting of calcium salts, magnesium salts, and zinc salts.

5. The cosmetic composition according to claim 1 or 2, wherein the divalent metal salt of alkenyl succinate starch ester is octenyl succinate starch ester calcium salt.

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