Skin cosmetic

Abstract

To provide a skin cosmetic having excellent antibacterial property, aesthetic property and stability.SOLUTION: A skin cosmetic contains the following (A) to (E): (A) water; (B) polyhydric alcohol; (C) fatty acid sorbitan; (D) polyoxyethylene hardened castor oil having a polymerization degree of POE chain of 80 to 100; and (E) plant extract from any one or more of leguminosae, Theaceae, Asteraceae, Rosaceae and Rutaceae.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to skin cosmetics.

Background Art

[0002] Consumers have high needs for cloudy low-viscosity cosmetics because of their high-class appearance and the impression of providing moisture and being excellent in smoothness. For example, Patent Documents 1 to 3 propose cosmetics that form niosomes from sorbitan fatty acid esters, which are nonionic surfactants, and polyoxyethylene hydrogenated castor oil, and have a cloudy appearance due to the niosomes scattering light. The cosmetics described in Patent Documents 1 to 3 dissolve components such as sorbitan fatty acid esters, polyoxyethylene hydrogenated castor oil, ceramides, and menthols in the cosmetics and contain polyhydric alcohols to stabilize the 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 part (hydroxyl group) and a hydrophobic part, they are easily incorporated into the membrane of niosomes, and the concentration in the external phase of the cosmetics decreases, resulting in a problem that the antibacterial property decreases.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a skin cosmetic excellent in antibacterial property, aesthetic property and stability.

Means for Solving the Problems

[0006] The main configuration of the present invention is as follows. 1. A skin cosmetic 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 of one or more plants of the Leguminosae, Theaceae, Compositae, Rosaceae, Rutaceae 2. Any one or more of (E) sweet pea extract which is Leguminosae, camellia extract which is Theaceae, artichoke extract which is Compositae, someiyoshino extract or strawberry extract which is Rosaceae, grapefruit extract which is Rutaceae The skin cosmetic according to 1., containing the same.

Effects of the Invention

[0007] The skin cosmetic of the present invention is excellent in antibacterial property and can prevent the growth of various bacteria. The skin cosmetic of the present invention has a high-class appearance and is also excellent in the stability of its appearance.

Modes for Carrying Out the Invention

[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 of one or more plants of the Leguminosae, Theaceae, Compositae, Rosaceae, Rutaceae In this specification, the notation "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 blending ratio of water can be set according to transparency, viscosity, etc. For example, it can be 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 blending ratio of water is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 85% by mass or more, and preferably 98% by mass or less, more preferably 97% by mass or less, still more preferably 96% by mass or less.

[0010] (B) Polyhydric alcohol Polyhydric alcohol contributes to the stability of the skin cosmetic of the present invention. As the polyhydric alcohol, any polyhydric alcohol that can be formulated in a skin cosmetic can be used without particular limitation as long as it exhibits the effects of the present invention. For example, ethylene glycol, 1,3-butylene glycol (BG), propylene glycol, dipropylene glycol (DPG), pentylene glycol, polyethylene glycol, butylethylpropanediol, etc. can be mentioned, and one or more of these can be mixed and used. Among these, BG, DPG, and pentylene glycol are preferred from the viewpoints of antibacterial properties and aesthetic properties of the skin cosmetic. The blending ratio of the polyhydric alcohol is not particularly limited as long as it is within the range where the effects of the present invention are exhibited, and it can be 1% by mass or more and 20% by mass or less based on the total amount 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 preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 7% by mass or less, and even more preferably 5% by mass or less.

[0011] (C) Sorbitan fatty acid ester Sorbitan fatty acid ester, also called sorbitan fatty acid, is an ester of sorbitan and fatty acid, and is used alone or in combination with other surfactants as a food emulsifier and a cosmetic / industrial surfactant. Examples of the sorbitan fatty acid esters include sorbitan sesquisoisostearate, sorbitan sesquioleate, and sorbitan oleate. Preferably, one or more of sorbitan sesquisoisostearate, sorbitan sesquioleate, etc. can be mixed and used. Among these, sorbitan sesquisoisostearate is particularly preferred. The blending ratio of the sorbitan fatty acid ester is preferably 0.01% by mass or more and 5% by mass or less, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and also more preferably 3% by mass or less, still more preferably 2% by mass or less, based on the total amount of the skin cosmetic of the present invention.

[0012] (D) Polyoxyethylene hydrogenated castor oil with a degree of polymerization of the POE chain of 80 to 100 The polyoxyethylene hydrogenated castor oil has an average degree of polymerization of the polyoxyethylene (POE) chain of 80 to 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 mixed and used. The average degree of polymerization of the POE chain of the polyoxyethylene hydrogenated castor oil is preferably 100 from the viewpoints of the aesthetics and stability of the skin cosmetic.

[0013] The blending ratio of the 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, still more preferably 0.1% by mass or more, and also more preferably 3% by mass or less, still more preferably 2% by mass or less, based on the total amount of the skin cosmetic of the present invention. 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 the POE chain of 80 to 100 is preferably 10:90 to 70:30, 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 the stability of the skin cosmetic, the ratio of the component (B) to the total of the components (C) and (D) (B / (C + D)) is preferably 1 or more and 20 or less, more preferably 1.5 or more, and also more preferably 15 or less.

[0014] (E) Extracts of one or more plants selected from the Fabaceae, Camelliaceae, Asteraceae, Rosaceae, and Rutaceae families (E) The extracts of one or more plants selected from the Fabaceae, Camelliaceae, Asteraceae, Rosaceae, and Rutaceae families, which are the components, improve antibacterial properties in the skin cosmetics of the present invention without impairing the stability of the skin cosmetics. Examples of the plant extracts include, for Fabaceae, sweet pea extract, pea extract, licorice extract, clara extract, kudzu extract, lotus root extract, soybean extract; for Camelliaceae, camellia japonica extract, camellia extract; for Asteraceae, artichoke extract, mugwort extract, wormwood extract, common yarrow extract, common fleabane extract, purple aster extract, narrow-leaved aster extract, maria thistle extract, chamomile extract, burdock extract, safflower extract, sunflower extract, yarrow extract, lettuce extract, safflower extract, sawtooth aster extract; for Rosaceae, somei yoshino extract, Japanese wild strawberry extract, Japanese rose extract, Japanese apricot extract, strawberry extract, dog rose extract, cottonrose hibiscus extract, quince extract, Japanese quince extract, peach extract, rose extract; for Rutaceae, grapefruit extract, pummelo extract, unshu mandarin extract, lemon extract, yuzu extract, sansho extract, orange extract, etc. One or two or more of these can be used. Among these, sweet pea extract, camellia japonica extract, artichoke extract, somei yoshino extract, Japanese wild strawberry extract, and grapefruit extract are preferred. (E) The mixing ratio of the component 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, based on the total amount of the skin cosmetics of the present invention.

[0015] In addition to the components (A) to (E), the skin cosmetic of the present invention can contain other components commonly used in cosmetics based on the required uses, effects, etc. Such other components include, for example, water-soluble organic solvents other than polyhydric alcohols, chelating agents, whitening agents, emollient agents, moisturizing agents, antioxidants, coloring agents, preservatives, fragrances (including essential oils), various oily components, various aqueous components, etc., and can be blended within a range that does not inhibit the effects of the present invention. However, it is preferable from the viewpoint of usability to contain one or more of tranexamic acid, niacinamide, ε-aminocaproic acid, and one or more of carboxyvinyl polymer and alkyl-modified carboxyvinyl polymer which are water-soluble thickeners. Further, in the skin cosmetic of the present invention, the blending ratio of antibacterial agents such as phenoxyethanol and parabens with respect to the whole skin cosmetic is preferably 1% by mass or less, more preferably 0.5% by mass or less, still more preferably 0.1% by mass or less, and most preferably not contained.

[0016] The skin cosmetic of the present invention is an aqueous cosmetic having water and water-soluble components of component (A) as main components, and also includes water-in-oil type emulsified cosmetics. The skin cosmetic of the present invention can be a lotion, essence, emulsion, body lotion, etc. The skin cosmetic of the present invention is preferably semi-transparent. In the present invention, the skin cosmetic being semi-transparent means that when the transmittance of purified water having an optical path length of 1 cm in the visible light region (660 nm) is set to 100%, the transmittance when the skin cosmetic is 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 the components (B) to (D) at 85°C and mixing them, adding this to water which is the heated component (A), and then adding the component (E). 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 way, niosomes mainly composed of (C) sorbitan fatty acid and (D) polyoxyethylene hydrogenated castor oil are formed in the cosmetic. Regarding the component (E), it is preferably added 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 to become a translucent cosmetic.

Examples

[0018] Examples and comparative examples are shown below to specifically explain the present invention. · Sweet pea flower extract (manufactured by Hamari Chemical Industry 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) · Yoshino cherry leaf extract (manufactured by Ichimaru Pharcos Co., Ltd., Cherry Blossom Extract B) · Raspberry root extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Himalayan Raspberry Extract BG80) · Grapefruit fruit extract (manufactured by Ichimaru Pharcos Co., Ltd., Falcorex Grapefruit B) · Houttuynia cordata extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Saururus Extract BG) · Momordica grosvenori peel extract (manufactured by Maruzen Pharmaceutical Co., Ltd., Momordica grosvenori Extract Powder) · Rosemary leaf extract (manufactured by Koei Kogyo Co., Ltd., Rosemary Extract) · Zinnia flower extract (manufactured by Ichimaru Pharcos Co., Ltd., Falcorex Zinnia Oi EX)

[0019] Skin cosmetics were prepared to have the formulations shown in Tables 1 to 3 and evaluated by the following method. The results are shown in Tables 1 to 3. 「Evaluation Method」 ·Initial appearance (aesthetic) A sample was prepared by diluting the skin cosmetic 10-fold with purified water. Using an ultraviolet-visible spectrophotometer, the transmittance of light with a wavelength of 660 nm and an optical path length of 1 cm was measured, with the transmittance of purified water set at 100%. ○: Transmittance is 0.1% or more and 90% or less. ×: Transmittance is less than 0.1% or higher than 90%. ·Stability The skin cosmetic was placed in a glass bottle with a diameter of approximately 4 cm and a volume of 60 ml, and after storage at 40°C for 1 month, the appearance was visually judged according to the following criteria. ○: No change in appearance. ×: Changes in appearance such as separation of oil were confirmed.

[0020] ·Antibacterial property After inoculating the skin cosmetic with a bacterial solution, the change in the number of bacteria was examined by the mixing method. Three types of inoculated bacteria, namely E. coli, P. aeruginosa, and S. aureus, were used. The number of bacteria at the 9-day mark was compared with that of Comparative Example 1, and the evaluation was carried out according to the following criteria based on the types of bacteria showing antibacterial properties. (Evaluation criteria) ◎: Two or more types 〇: One type ×: Zero types

[0021]

Table 1

[0022]

Table 2

[0023]

Table 3

[0024] The skin cosmetics obtained in Examples 1 to 16 containing plant extracts of any one or more of (E) Fabaceae, Camellia family, Asteraceae, Rosaceae, and Rutaceae of the present invention were excellent in antibacterial properties, and also excellent in aesthetic properties and stability. On the other hand, the skin cosmetics obtained in Comparative Examples 1 to 6 that do not contain plant extracts or contain plant extracts of Saururaceae (Houttuynia cordata extract), Moraceae (mulberry fruit peel extract), Lamiaceae (rosemary leaf extract), and Malvaceae (hibiscus flower extract) were inferior in antibacterial properties, or were excellent in antibacterial properties but inferior in aesthetic properties or stability. The skin cosmetics obtained in Comparative Examples 7 to 9 that do not contain (C) or (D) were inferior in aesthetic properties or stability.

[0025] Formulation examples are shown below. Formulation Example 1 Skin Lotion (Ingredient) (mass%) Water Remainder 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 Methyl Gluceth-10 1.0 Betaine 1.0 Raffinose 0.1 Dipotassium Glycyrrhizinate 0.01 Polyquaternium-51 0.1 Sodium Carboxymethyl Dextran 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 (Ingredient) (mass%) Water Remainder 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 Methyl gluceth-10 1.0 Betaine 1.0 Raffinose 0.1 Grapefruit fruit extract 0.1 Sweet pea flower extract 1.0

Claims

1. A skin cosmetic containing 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) Extracts of one or more plants selected from the legume family, camellia family, aster family, rose family, and citrus family

2. The skin cosmetic according to claim 1, containing any one or more of (E) sweet pea extract of the legume family, camellia japonica extract of the camellia family, artichoke extract of the aster family, somei yoshino extract or strawberry extract of the rose family, and grapefruit extract of the citrus family .

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