Skin cosmetics

Abstract

To provide a skin cosmetic excellent in antibacterial properties, aesthetic properties and stability. [Solution] A skin cosmetic preparation containing the following (A) to (E). (A) Water (B) Polyhydric alcohol (C) Sorbitan fatty acid (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100 (E) Extracts from plants of one or more of the following families: Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae

Description

[Technical field]

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

[0002] There is high demand from consumers for milky, low-viscosity cosmetics due to their luxurious appearance and the impression that they are moisturizing and have a smooth feel. For example, Patent Documents 1 to 3 propose cosmetics in which niosomes are formed from a sorbitan fatty acid ester, which is a nonionic surfactant, and polyoxyethylene hydrogenated castor oil, and the niosomes have a cloudy appearance due to light scattering. The cosmetics described in Patent Documents 1 to 3 contain polyhydric alcohols to dissolve components such as sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil, ceramides, and menthols in the cosmetics and to stabilize niosomes.

[0003] Here, polyhydric alcohols are known to have antibacterial properties. However, in the cosmetics described in Patent Documents 1 to 3, since polyhydric alcohols have a hydrophilic portion (hydroxyl group) and a hydrophobic portion, they are easily incorporated into the membrane of niosomes, and the concentration of the polyhydric alcohol in the external phase of the cosmetic decreases, resulting in a problem of decreased antibacterial properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-113155 [Patent Document 2] JP 2021-113156 A [Patent Document 3] JP 2022-110471 A Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a skin cosmetic preparation that is excellent in antibacterial properties, aesthetic properties and stability. [Means for solving the problem]

[0006] The main configuration of the present invention is as follows. 1. A skin cosmetic preparation containing the following (A) to (E). (A) Water (B) Polyhydric alcohol (C) Sorbitan fatty acid (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100 (E) Extracts from plants of one or more of the following families: Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae 2. (E) One or more of the following: sweet pea extract, which belongs to the Fabaceae family; tea plant extract, which belongs to the Theaceae family; artichoke extract, which belongs to the Asteraceae family; Somei-Yoshino cherry extract or Igusa rubra extract, which belongs to the Rosaceae family; and grapefruit extract, which belongs to the Rutaceae family. 1. A skin cosmetic composition comprising the above component (A). Effect of the Invention

[0007] The skin cosmetic of the present invention has excellent antibacterial properties and can prevent the growth of various bacteria. The skin cosmetic of the present invention has a luxurious appearance and is also excellent in the stability of the appearance. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The skin cosmetic of the present invention contains the following (A) to (E). (A) Water (B) Polyhydric alcohol (C) Sorbitan fatty acid (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100 (E) Extracts from plants of one or more of the following families: Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae In this specification, the expression "A to B (A and B are numerical values)" means a numerical range including both ends, that is, A or more and B or less.

[0009] (A) Water The skin cosmetic of the present invention contains water as an essential component. The content of water can be set depending on transparency, viscosity, etc., and can be, for example, 50% by mass or more and 99% by mass or less based on the total amount of the skin cosmetic of the present invention. The content of water is preferably 70% by mass or more, more preferably 80% by mass or more, even more preferably 85% by mass or more, and is preferably 98% by mass or less, more preferably 97% by mass or less, and even more preferably 96% by mass or less.

[0010] (B) Polyhydric alcohol The polyhydric alcohol contributes to the stability of the skin cosmetic of the present invention. As the polyhydric alcohol, any polyhydric alcohol that is blended in a skin cosmetic can be used without any particular limitation as long as it can produce the effects of the present invention, and examples thereof include ethylene glycol, 1,3-butylene glycol (BG), propylene glycol, dipropylene glycol (DPG), pentylene glycol, polyethylene glycol, butylethylpropanediol, etc., and these can be used alone or in combination of two or more. Among these, BG, DPG, and pentylene glycol are preferred from the viewpoints of antibacterial properties and aesthetics of the skin cosmetic. The blending ratio of the polyhydric alcohol is not particularly limited as long as it is within the range in which the effects of the present invention are exhibited, and can be 1% by mass or more and 20% by mass or less based on the total weight of the skin cosmetic of the present invention. The blending ratio of the polyhydric alcohol is preferably 1.5% by mass or more, more preferably 2% by mass or more, and is preferably 15% by mass or less, more preferably 10% by mass or less, even more preferably 7% by mass or less, and even more preferably 5% by mass or less.

[0011] (C) Sorbitan fatty acid Sorbitan fatty acids, also known as sorbitan fatty acids, are esters of sorbitan and fatty acids and are used as food emulsifiers and cosmetic and industrial surfactants, either alone or together with other surfactants. The fatty acid sorbitan is sorbitan sesquiisostearate, sorbitan sesquioleate, or sorbitan oleate, and preferably sorbitan sesquiisostearate, sorbitan sesquioleate, etc. may be used alone or in combination of two or more. Among these, sorbitan sesquiisostearate is particularly preferred. The blending ratio of the fatty acid sorbitan is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, more preferably 3% by mass or less, and even more preferably 2% by mass or less, based on the total weight of the skin cosmetic composition of the present invention.

[0012] (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100 Polyoxyethylene hydrogenated castor oil has an average degree of polymerization of polyoxyethylene (POE) chains of 80 to 100. Examples of polyoxyethylene hydrogenated castor oil include PEG-80 hydrogenated castor oil and PEG-100 hydrogenated castor oil, and one or more of these may be used in combination. The average degree of polymerization of the POE chains of polyoxyethylene hydrogenated castor oil is preferably 100 from the viewpoints of aesthetics and stability of the skin cosmetic.

[0013] The blending ratio of polyoxyethylene hydrogenated castor oil is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, more preferably 3% by mass or less, and even more preferably 2% by mass or less, based on the entire skin cosmetic composition of the present invention. In the skin cosmetic of the present invention, the mass ratio (C:D) of (C) fatty acid sorbitan to (D) polyoxyethylene hydrogenated castor oil having a POE chain polymerization degree of 80 to 100 is preferably 10:90 to 70:30, and more preferably 20:80 to 60:40, from the viewpoint of the aesthetics of the skin cosmetic. In the skin cosmetic of the present invention, from the viewpoint of 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 more preferably 15 or less.

[0014] (E) Extracts from plants of one or more of the following families: Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae Component (E) is an extract of one or more plants from the families Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae, which improves the antibacterial properties of the skin cosmetic of the present invention without impairing the stability of the skin cosmetic. Examples of plant extracts include those from the legume family, such as sweet pea extract, pea extract, licorice extract, sophora flavescens extract, kudzu extract, astragalus extract, and soybean extract; those from the Theaceae family, such as tea plant extract and camellia extract; and those from the Asteraceae family, such as artichoke extract, wormwood extract, artemisia capillaris extract, hare daisy extract, snowdrop extract, Echinacea purpurea extract, Echinacea angustifolia extract, milk thistle extract, chamomile extract, burdock extract, calendula extract, sunflower extract, and cornflower extract. Chrysanthemum extract, lettuce extract, safflower extract, yarrow extract; rose family: Somei Yoshino extract, Iris moniliforme extract, Rosa nigra extract, Prunus mume extract, strawberry extract, Rosa canina extract, Savonella saponaria extract, quince extract, Chinese quince extract, Hawthorn extract, Peach extract, Rose extract; Rutaceae: grapefruit extract, Phellodendron amurense extract, Satsuma mandarin extract, lemon extract, Yuzu extract, Japanese pepper extract, orange extract, etc., and one or more of these may be used. Among these, sweet pea extract, tea plant extract, artichoke extract, Somei Yoshino extract, Iris moniliforme extract, and grapefruit extract are preferred. The blending ratio of component (E) is preferably from 0.01% by mass to 10% by mass, more preferably from 0.05% by mass or more, and more preferably from 5% by mass or less, based on the entire skin cosmetic composition of the present invention.

[0015] In addition to the components (A) to (E), the skin cosmetic of the present invention may contain other components that are usually used in cosmetics, depending on the intended use, effect, etc. Examples of such other components include water-soluble organic solvents other than polyhydric alcohols, chelating agents, whitening agents, emollients, moisturizing agents, antioxidants, coloring agents, preservatives, fragrances (including essential oils), various oily components, and various aqueous components. These may be incorporated within a range that does not impair the effects of the present invention, but it is preferable from the viewpoint of usability to include at least one of tranexamic acid, niacinamide, and ε-aminocaproic acid, and at least one of water-soluble thickeners, carboxyvinyl polymers and alkyl-modified carboxyvinyl polymers. In addition, the skin cosmetic of the present invention preferably contains antibacterial agents such as phenoxyethanol and parabens in a content of 1% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and most preferably does not contain any of them.

[0016] The skin cosmetic of the present invention is an aqueous cosmetic containing water and a water-soluble component (A) as the main components, and also includes an oil-in-water emulsion cosmetic. The skin cosmetic of the present invention can be a skin lotion, a beauty essence, an emulsion, a body lotion, etc. The skin cosmetic of the present invention is preferably translucent. In the present invention, a skin cosmetic is translucent means that, when the transmittance of transparent purified water in the visible light region (660 nm) over an optical path length of 1 cm is taken as 100%, the transmittance of the skin cosmetic when diluted 10 times with purified water is 0.1% to 90%.

[0017] "Preparation of cosmetics" The skin cosmetic of the present invention can be prepared by heating and mixing the (B) to (D) components to 85°C, adding this to the heated (A) component, water, and then adding the (E) component. The heating temperature of the (A) water is preferably 80 to 100°C, more preferably 80 to 90°C, and even more preferably 85 to 90°C. When prepared in this manner, niosomes mainly composed of (C) fatty acid sorbitan and (D) polyoxyethylene hydrogenated castor oil are formed in the cosmetic. It is preferable to add the (E) component after cooling the niosomes to about 20 to 35°C. The formed niosomes have a particle size of about 200 nm, are stably dispersed in the cosmetic, and scatter light, resulting in a translucent cosmetic. EXAMPLES

[0018] The present invention will be described in detail below with reference to examples and comparative examples. Sweet pea flower extract (manufactured by Hamari Pharmaceutical Co., Ltd., Sweet pea flower extract) Tea leaf extract (Maruzen Pharmaceuticals, Green Tea Extract BG) Artichoke Leaf Extract (Ichimaru Pharcos Co., Ltd., BioBenefits) Somei-Yoshino Leaf Extract (Ichimaru Pharcos Co., Ltd., Sakura Extract B) -Iraquia raspberry root extract (Maruzen Pharmaceutical Co., Ltd., Himalayan raspberry extract BG80) Grapefruit fruit extract (Falcolex Grapefruit B, manufactured by Ichimaru Falcos Co., Ltd.) Houttuynia cordata extract (Maruzen Pharmaceuticals Co., Ltd., Houttuynia herb extract BG) · Sapindus mukorossi peel extract (Maruzen Pharmaceutical Co., Ltd., Sapindus mukorossi extract powder) ·Rosemary leaf extract (manufactured by Koei Kogyo Co., Ltd., rosemary wax extract) ·Mallow flower extract (Falcolex Mallow EX, manufactured by Ichimaru Falcos Co., Ltd.)

[0019] Skin cosmetics were prepared according to the compositions shown in Tables 1 to 3 and evaluated by the following methods. The results are shown in Tables 1 to 3. "Evaluation Method" Initial appearance (aesthetics) The skin cosmetic was diluted 10 times with purified water to prepare a sample, and the transmittance of light with a wavelength of 660 nm was measured using an ultraviolet-visible spectrophotometer with an optical path length of 1 cm, with the transmittance of purified water being set at 100%. ○: Transmittance is 0.1% or more and 90% or less. ×: Transmittance is less than 0.1% or more than 90%. ·Stability The skin cosmetic preparations were placed in a glass bottle with a diameter of about 4 cm and a volume of 60 ml, and after storage at 40°C for one month, the appearance was visually inspected and judged according to the following criteria. ○: No change in appearance. ×: A change in appearance such as separation of oil was observed.

[0020] ·Antibacterial After inoculating the skin cosmetic with a bacterial solution, the change in the number of bacteria was examined using the pour-mix method. The three types of bacteria inoculated were E. coli, P. aeruginosa, and S. aureus. The number of bacteria after 9 days had decreased compared to the number of bacteria in Comparative Example 1, and the type of bacteria that showed antibacterial properties was evaluated according to the following criteria. (Evaluation Criteria) ◎: 2 or more types 〇:1 type ×: 0 species

[0021] [Table 1]

[0022] [Table 2]

[0023] [Table 3]

[0024] The skin cosmetics obtained in Examples 1 to 16 of the present invention, which contain one or more plant extracts from the families (E) Fabaceae, Theaceae, Asteraceae, Rosaceae, and Rutaceae, were excellent in antibacterial properties, as well as in aesthetic properties and stability. In contrast, the skin cosmetics obtained in Comparative Examples 1 to 6, which did not contain any plant extracts or contained plant extracts from the family Houttuynia cordata (Houttuynia cordata extract), the family Sapindaceae (Sapindus mukorossi peel extract), the family Lamiaceae (Rosemary leaf extract), and the family Malvaceae (Mallow flower extract), had poor antibacterial properties or, although they had excellent antibacterial properties, were poor in aesthetics or stability. The skin cosmetics obtained in Comparative Examples 7 to 9, which did not contain (C) or (D), were inferior in aesthetics or stability.

[0025] An example of a prescription is shown below. Formulation example 1: Serum (Ingredients) (mass%) water residue Acrylates Crosspolymer 2-Na 3.0 DPG 5.0 Sorbitan Sesquiisostearate 0.5 PEG-100 hydrogenated castor oil 0.5 Pentylene glycol 1.5 Glycerin 1.0 Glycereth-26 2.0 Methylgluceth-10 1.0 Betaine 1.0 Raffinose 0.1 Glycyrrhizic acid 2K 0.01 Polyquaternium-51 0.1 Carboxymethyl dextran sodium 0.1 Carbomer 0.04 Potassium hydroxide 0.004 Sweet Pea Flower Extract 0.1 Tea Leaf Extract 0.1

[0026] Formulation example 2: Lotion (Ingredients) (mass%) water residue DPG 5.0 Sorbitan Sesquioleate 0.5 PEG-100 hydrogenated castor oil 0.5 Pentylene glycol 1.5 Glycerin 1.0 Glycereth-26 2.0 Methylgluceth-10 1.0 Betaine 1.0 Raffinose 0.1 Grapefruit Fruit Extract 0.1 Sweet Pea Flower Extract 1.0

Claims

[Claim 1] Contains the following (A) to (E): A skin cosmetic preparation that is a skin lotion, a beauty essence, an emulsion, or a body lotion. (A) Water (B) Polyhydric alcohol (C) Sorbitan fatty acid (D) Polyoxyethylene hydrogenated castor oil with a POE chain polymerization degree of 80 to 100 (E) one or more of sweet pea extract, which belongs to the Fabaceae family; tea plant extract, which belongs to the Theaceae family; artichoke extract, which belongs to the Asteraceae family; Somei-Yoshino cherry extract or Igusa rubra extract, which belongs to the Rosaceae family; and grapefruit extract, which belongs to the Rutaceae family

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