Skin cosmetic

Abstract

The present invention addresses the problem of providing a skin cosmetic having excellent antibacterial properties, aesthetic properties, and stability. As a solution, provided is a skin cosmetic characterized by containing the following (A)-(E): (A) water; (B) a polyol; (C) a sorbitan fatty acid ester; (D) polyoxyethylene hydrogenated castor oil with the POE chain polymerization degree of 80 to 100; and (E) at least one plant extract of legume family, theaceae family, compositae family, rosaceae family, and rutaceae family.

Description

Technical Field

[0001] The present invention relates to skin cosmetics. Background Art

[0002] Since white-turbid and low-viscosity cosmetics give an impression of a high-class appearance and excellent moist feeling, they are in high demand among consumers.

[0003] For example, Patent Documents 1 to 3 propose a cosmetic formed of sorbitan fatty acid ester and polyoxyethylene hydrogenated castor oil as nonionic surfactants, which has a white-turbid appearance by scattering light through the lipid nanocapsules.

[0004] In the cosmetics described in Patent Documents 1 to 3, polyhydric alcohols are contained to dissolve components such as sorbitan fatty acid ester, polyoxyethylene hydrogenated castor oil, ceramides, and menthol in the cosmetics and to stabilize the lipid nanocapsules.

[0005] Here, it is known that polyhydric alcohols have antibacterial properties. However, in the cosmetics described in Patent Documents 1 to 3, since polyhydric alcohols have a hydrophilic part (hydroxyl group) and a hydrophobic part, they are easily absorbed into the membrane of the lipid nanocapsules, reducing the concentration of the external phase of the cosmetics and thus causing a problem of reduced antibacterial properties.

[0006] Patent Documents Patent Document 1: Japanese Patent Application Laid-Open No. 2021-113155 Patent Document 2: Japanese Patent Application Laid-Open No. 2021-113156 Patent Document 3: Japanese Patent Application Laid-Open No. 2022-110471 Summary of the Invention An object of the present invention is to provide a skin cosmetic excellent in antibacterial properties, aesthetic properties, and stability.

[0007] The main configuration of the present invention is as follows.

[0008] 1. A skin cosmetic, characterized by containing the following (A) to (E): (A) Water; (B) Polyhydric alcohol; (C) Sorbitan fatty acid ester; (D) Polyoxyethylene hydrogenated castor oil having a degree of polymerization of the POE chain of 80 to 100; (E) An extract of one or more plants selected from the legume family, the tea family, the aster family, the rose family, and the rue family.

[0009] 2. The skin cosmetic according to 1, characterized in that it contains any one or more of the following extracts: (E) Lathyrus odoratus extract belonging to the Leguminosae family, Camellia sinensis extract belonging to the Theaceae family, Cynara scolymus extract belonging to the Asteraceae family, Prunus × yedoensis extract or Rubus ellipticus extract belonging to the Rosaceae family, and Citrus paradisi extract belonging to the Rutaceae family.

[0010] The skin cosmetic of the present invention has excellent antibacterial properties and can prevent the growth of miscellaneous bacteria. The skin cosmetic of the present invention has an appearance with a sense of luxury, and in addition, the stability of its appearance is also excellent. Detailed implementation mode

[0011] The skin cosmetic of the present invention contains the following (A) to (E): (A) Water; (B) Polyhydric alcohol; (C) Sorbitan fatty acid ester; (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100; (E) Plant extracts of any one or more of the Leguminosae family, Theaceae family, Asteraceae family, Rosaceae family, and Rutaceae family.

[0012] In this specification, the description of "A to B (A and B are numerical values)" means a numerical range including its endpoint values, that is, A or more and B or less.

[0013] (A) Water Water is an essential component of the skin cosmetic of the present invention.

[0014] The blending ratio of water can be set according to transparency or viscosity, etc. For example, relative to the whole skin cosmetic of the present invention, it can be set to 50% by mass or more and 99% by mass or less. The blending ratio of water is preferably 70% by mass or more, more preferably 80% by mass or more, further preferably 85% by mass or more. In addition, it is preferably 98% by mass or less, more preferably 97% by mass or less, further preferably 96% by mass or less.

[0015] (B) Polyhydric alcohol Polyhydric alcohol contributes to the stability of the skin cosmetic of the present invention. As the polyhydric alcohol, as long as it can exert the effects of the present invention, the substances blended into the skin cosmetic can be used without particular limitation. For example, ethylene glycol, 1,3 - butanediol (BG), propylene glycol, dipropylene glycol (DPG), 1,2 - pentanediol, polyethylene glycol, butylethylpropanediol, etc. can be cited, and one of these can be used or two or more can be used in combination. Among these, from the perspectives of the antibacterial properties and aesthetic properties of the skin cosmetic, BG, DPG, and 1,2 - pentanediol are preferred.

[0016] The blending ratio of the polyol is not particularly limited as long as it is within the range where the effects of the present invention can be exhibited, and can be set to 1% by mass or more and 20% by mass or less based on the entire skin cosmetic of the present invention. The blending ratio of the polyol is preferably 1.5% by mass or more, more preferably 2% by mass or more. In addition, it is preferably 15% by mass or less, more preferably 10% by mass or less, further preferably 7% by mass or less, and even more preferably 5% by mass or less.

[0017] (C)Sorbitan fatty acid ester Sorbitan fatty acid ester, also known as sorbitol anhydride fatty acid ester, is an ester of sorbitol anhydride and fatty acid. As a food emulsifier or a cosmetic and industrial surfactant, it can be used alone or in combination with other surfactants.

[0018] As the sorbitan fatty acid ester, there are sorbitan sesquiisostearate, sorbitan sesquioleate, and sorbitan oleate. It is preferred to use one or more of sorbitan sesquiisostearate, sorbitan sesquioleate, etc. in combination. Among these, sorbitan sesquiisostearate is particularly preferred.

[0019] The blending ratio of the sorbitan fatty acid ester, based on the entire skin cosmetic of the present invention, is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, further preferably 0.1% by mass or more. In addition, it is more preferably 3% by mass or less, further preferably 2% by mass or less.

[0020] (D)Polyoxyethylene hydrogenated castor oil with a degree of polymerization of 80 - 100 of the POE chain The average degree of polymerization of the polyoxyethylene (POE) chain of the polyoxyethylene hydrogenated castor oil is 80 - 100. Examples of the polyoxyethylene hydrogenated castor oil include PEG - 80 hydrogenated castor oil and PEG - 100 hydrogenated castor oil, and one or more of these can be used in combination. From the perspective of the aesthetics and stability of the skin cosmetic, the average degree of polymerization of the POE chain of the polyoxyethylene hydrogenated castor oil is preferably 100.

[0021] The blending ratio of the polyoxyethylene hydrogenated castor oil, based on the entire skin cosmetic of the present invention, is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, further preferably 0.1% by mass or more. In addition, it is more preferably 3% by mass or less, further preferably 2% by mass or less.

[0022] In the skin cosmetic of the present invention, the mass ratio (C:D) of (C) sorbitan fatty acid ester to (D) polyoxyethylene hydrogenated castor oil with a degree of polymerization of 80 - 100 of the POE chain, from the perspective of the aesthetics of the skin cosmetic, is preferably 10:90 - 70:30, more preferably 20:80 - 60:40.

[0023] In the skin cosmetic of the present invention, from the perspective of the stability of the skin cosmetic, the ratio of component (B) to the total of components (C) and (D) (B / (C+D)) is preferably 1 or more and 20 or less, more preferably 1.5 or more, and further preferably 15 or less.

[0024] (E) Plant extract of one or more of Leguminosae, Theaceae, Compositae, Rosaceae, Rutaceae As the plant extract of component (E), the plant extract of one or more of Leguminosae, Theaceae, Compositae, Rosaceae, Rutaceae will not impair the stability of the skin cosmetic in the skin cosmetic of the present invention and can improve antibacterial properties.

[0025] As the plant extract, for example, can be cited: Lathyrus odoratus extract, Pisum sativum extract, Glycyrrhiza glabra extract, Sophora flavescens extract, Pueraria lobata extract, Astragalus sinicus extract, Glycine max extract belonging to Leguminosae; Camellia sinensis extract, Camellia japonica extract belonging to Theaceae; Cynara scolymus extract, Artemisia absinthium extract, Artemisia capillaris extract, Arnica montana extract, Leontopodium alpinum extract, Echinacea purpurea extract, Echinacea angustifolia extract, Silybum marianum extract, Matricaria recutita extract, Arctium lappa extract, Calendula officinalis extract, Helianthus annuus extract, Centaurea cyanus extract, Lactuca sativa extract, Carthamus tinctorius extract, Achillea millefolium extract belonging to Compositae; Prunus yedoensis Matsum. extract, Rubus ellipticus Smith extract, Rosa roxburghii Tratt extract, Prunus mume Sieb. et Zucc. extract, Fragaria × ananassa Duch. extract, Rosa canina extract, Quillaja saponaria Molina extract, Cydonia oblonga Mill. extract, Chaenomeles sinensis (Thouin) Koehne extract, Crataegus cuneata Sieb. et Zucc. extract, Prunus persica (L.) Batsch extract, Rosa rugosa Thunb. extract belonging to Rosaceae; Citrus paradisi extract, Phellodendron amurense Rupr. extract, Citrus unshiu Marc. extract, Citrus limon (L.) Burm. f. extract, Citrus junos Sieb. ex Tanaka extract, Zanthoxylum piperitum DC. extract, Citrus sinensis (L.) Osbeck extract belonging to Rutaceae, etc., and one or two or more of these can be used. Among these, Lathyrus odoratus extract, Camellia sinensis extract, Cynara scolymus extract, Prunus yedoensis Matsum. extract, Rubus ellipticus Smith extract, Citrus paradisi extract are preferred.

[0026] The blending ratio of component (E) relative to the whole skin cosmetic of the present invention is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more, and further preferably 5% by mass or less.

[0027] In addition to the components (A) to (E), the skin cosmetics of the present invention may contain other components commonly used in cosmetics according to the intended use or effect. Examples of such other components include water-soluble organic solvents other than polyhydric alcohols, chelating agents, whitening agents, emollients, moisturizers, antioxidants, colorants, preservatives, fragrances (including essential oils), various oily components, various aqueous components, etc. These can be formulated within the range that does not impair the effects of the present invention. However, it is preferred to contain one or more of tranexamic acid, niacinamide, ε-aminocaproic acid, and one or more of carboxyvinyl polymer and alkyl-modified carboxyvinyl polymer as water-soluble thickeners from the perspective of usability. In addition, for the skin cosmetics of the present invention, the blending ratio of antibacterial agents such as phenoxyethanol or parabens in the whole skin cosmetics is preferably 1% by mass or less, more preferably 0.5% by mass or less, further preferably 0.1% by mass or less, and most preferably not contained.

[0028] The skin cosmetics of the present invention also include water-in-oil emulsified cosmetics, which are aqueous cosmetics mainly composed of the water and water-soluble components of component (A). The skin cosmetics of the present invention can be made into lotion, essence, emulsion, body milk, etc.

[0029] The skin cosmetics of the present invention are preferably semi-transparent. In addition, in the present invention, when the transmittance of transparent purified water with a light path length of 1 cm in the visible light region (660 nm) is set to 100%, the transmittance of the skin cosmetics diluted 10 times with purified water is 0.1% to 90% for the skin cosmetics to be semi-transparent.

[0030] "Preparation of Cosmetics" The skin cosmetics of the present invention can be prepared by heating the components (B) to (D) to 85°C and mixing them, adding them to the heated water of component (A), and then adding component (E). The heating temperature of (A) water is preferably 80 to 100°C, more preferably 80 to 90°C, and further preferably 85 to 90°C. After preparation in this way, lipid nanocapsules mainly composed of (C) sorbitan fatty acid ester and (D) polyoxyethylene hydrogenated castor oil will be formed in the cosmetics. Regarding component (E), it is preferably added after cooling the lipid nanocapsules to about 20 to 35°C. The formed lipid nanocapsules have a particle size of about 200 nm, are stably dispersed in the cosmetics, and become semi-transparent cosmetics by scattering light.

[0031] Examples Examples and comparative examples are shown below to specifically illustrate the present invention.

[0032] ・ Sweet pea flower extract (manufactured by Hamari Yakuhin Kogyo Co., Ltd., Sweet pea flower extract) ・Tea leaf extract (manufactured by Maruzen Pharmaceutical Co., Ltd., green tea extract BG) ・Artichoke leaf extract (manufactured by Ichimaru PHARCOS Co., Ltd., Biobenefity) ・Prunus yedoensis Matsum. leaf extract (manufactured by Ichimaru PHARCOS Co., Ltd., cherry blossom extract B) ・Rubus ellipticus Smith root extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Rubus ellipticus Smith root extract BG80) ・Grapefruit fruit extract (manufactured by Ichimaru PHARCOS Co., Ltd., Pharcolex grapefruit B) ・Houttuynia cordata Thunb. extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Houttuynia cordata Thunb. extract BG) ・Sapindus mukorossi Gaertn. pericarp extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Sapindus mukorossi Gaertn. extract powder) ・Rosmarinus officinalis L. leaf extract (manufactured by Koei Kogyo Co., Ltd., rosemary extract) ・Malva sylvestris L. extract (manufactured by Ichimaru PHARCOS Co., Ltd., Pharcolex mallow EX) Skin cosmetics were prepared at the ratios shown in Tables 1 to 3 and evaluated by the following method. The results are shown in Tables 1 to 3.

[0033] "Evaluation method" ・Initial appearance (aesthetic property) A substance obtained by diluting the skin cosmetic 10-fold with purified water was used as a sample, and the transmittance of light at a wavelength of 660 nm with an optical path length of 1 cm was measured using an ultraviolet-visible spectrophotometer. The transmittance of purified water was set to 100%.

[0034] ○: Transmittance is 0.1% or more and 90% or less.

[0035] ×: Transmittance is less than 0.1% or higher than 90%.

[0036] ・Stability The skin cosmetic was placed in a glass bottle with a diameter of about 4 cm and a capacity of 60 ml, and the appearance after storage at 40 °C for 1 month was visually observed and judged according to the following criteria.

[0037] ○: Appearance has not changed.

[0038] ×: Appearance changes such as separation of oil were confirmed.

[0039] ・Antibacterial property After inoculating the bacterial solution into the skin cosmetics, the pour plate method was used to investigate the change in the number of bacteria. In addition, three types of bacteria, namely E. coli, P. aeruginosa, and S. aureus, were used for inoculation. The number of bacteria after 9 days was reduced compared to that in Comparative Example 1, and the antibacterial property was evaluated according to the following criteria based on the types of bacteria showing antibacterial activity.

[0040] (Evaluation Criteria) ◎: Two or more types 〇: One type ×: Zero type [Table 1]

[0041] [Table 2]

[0042] [Table 3]

[0043] The skin cosmetics obtained from Examples 1 to 16 of the present invention containing one or more plant extracts selected from (E) Leguminosae, Theaceae, Compositae, Rosaceae, and Rutaceae have excellent antibacterial properties, and in addition, their aesthetic properties and stability are also excellent.

[0044] In contrast, the skin cosmetics obtained from Comparative Examples 1 to 6 containing no plant extract or containing plant extracts of Saururaceae (Houttuynia cordata extract), Sapindaceae (Sapindus mukorossi pericarp extract), Lamiaceae (Rosmarinus officinalis leaf extract), and Malvaceae (Malva sylvestris flower extract) have poor antibacterial properties, or although they have excellent antibacterial properties, their aesthetic properties or stability are poor.

[0045] The skin cosmetics obtained from Comparative Examples 7 to 9 containing no (C) or (D) have poor aesthetic properties or stability.

[0046] The following shows formulation examples.

[0047] Formulation Example 1 Skin Lotion (Formulation Ingredients) (mass %) Water Remaining Sodium acrylate / acrylates copolymer - 23.0 DPG 5.0 Sorbitan sesquiisostearate 0.5 PEG - 100 hydrogenated castor oil 0.5 1,2 - Pentanediol 1.5 Glycerin 1.0 Glycereth - 26 2.0 Methyl gluceth - 10 1.0 Betaine 1.0 Raffinose 0.1 Dipotassium Glycyrrhizinate 0.01 Polyquaternium-51 0.1 Sodium Carboxymethyl Dextrin 0.1 Carbomer 0.04 Potassium Hydroxide 0.004 Lathyrus odoratus Flower Extract 0.1 Tea Leaf Extract 0.1 Formulation Example 2 Skin Lotion (Blending Ingredients) (mass%) Water Remainder DPG 5.0 Sorbitan Sesquioleate 0.5 PEG-100 Hydrogenated Castor Oil 0.5 1,2-Pentanediol 1.5 Glycerin 1.0 Glycerol Polyether-26 2.0 Methyl Gluceth-10 1.0 Betaine 1.0 Raffinose 0.1 Grapefruit Fruit Extract 0.1 Lathyrus odoratus Flower Extract 1.0

Claims

1. A skin cosmetic, characterized in that: Contains the following (A)~(E): (A) Water; (B) polyols; (C) sorbitan fatty acid esters; (D) polyoxyethylene hydrogenated castor oil with a degree of polymerization of POE chain of 80 to 100; (E) Extracts of one or more plants belonging to the family Leguminosae, Theaceae, Asteraceae, Rosaceae, and Rutaceae.

2. The skin cosmetic according to claim 1, characterized in that: (E) at least one of sweet pea extract belonging to the Leguminosae family, tea tree extract belonging to the Theaceae family, cardoon extract belonging to the Asteraceae family, Somei Yoshino cherry extract or Rubus ovata extract belonging to the Rosaceae family, and grapefruit extract belonging to the Rutaceae family.

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