Skin cosmetic

Abstract

To provide a skin cosmetic that has a transparent to translucent appearance, shows high storage stability at high temperatures, easily agrees with skin during application, and gives a moisture feel after application.SOLUTION: A skin cosmetic has a transparent to translucent appearance and contains following components (A), (B), (C), (D) and (E): (A) polyglyceryl fatty acid ester, (B) polyoxyethylene hydrogenated castor oil with an HLB of 10-20, (C) dihydric alcohol, (D) trivalent alcohol, and (E) water.SELECTED DRAWING: None

Description

[Technical Field]

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

[0002] In recent years, cosmetic products with a transparent to translucent appearance have been in demand as aesthetic cosmetics. For example, Patent Document 1 describes that a liquid cosmetic containing a pyroglutamic acid ester surfactant, a polyglycerol fatty acid ester, a polyhydric alcohol, and a lower alcohol maintains its transparency even when stored for a long period of time and has excellent skin conditioning and protecting properties. Furthermore, Patent Document 2 describes that a translucent cosmetic composition containing 0.01 to 5 wt % of a polyglycerol fatty acid ester and 0.01 to 5 wt % of a polyoxyethylene-type nonionic surfactant in a water-alcohol system with an alcohol / (water + alcohol) weight ratio of 0.01 to 0.4, which is liquid or paste-like at room temperature, maintains a constant translucency even when stored over a wide temperature range for a long period of time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-238355 [Patent Document 2] Japanese Patent Publication No. 12603 / 1983 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional transparent to translucent cosmetics have had issues with stability at high temperatures, compatibility with the skin upon application, and moisturizing feeling on the skin after application. [Means for solving the problem]

[0005] The present inventors have discovered that a skin cosmetic composition that is transparent to translucent in appearance and that is made by combining a polyglycerol fatty acid ester, polyoxyethylene hydrogenated castor oil with a specific HLB, a dihydric alcohol, and a trihydric alcohol has excellent stability at high temperatures, is easily absorbed into the skin upon application, and leaves the skin feeling moisturized after application.

[0006] The present invention relates to a composition comprising the following components (A), (B), (C), (D) and (E): (A) polyglycerol fatty acid ester, (B) Polyoxyethylene hydrogenated castor oil with an HLB of 10 to 20, (C) a dihydric alcohol, (D) trihydric alcohol, (E)Water The present invention relates to a skin cosmetic that contains the above and has a transparent to translucent appearance. [Effects of the Invention]

[0007] The skin cosmetic of the present invention has a transparent to semi-transparent appearance, has excellent storage stability at high temperatures, is easily absorbed into the skin upon application, and provides a sufficient moisturizing feeling after application. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the polyglycerol fatty acid ester of component (A) used in the present invention, the average degree of polymerization of glycerol is preferably 2 or more, more preferably 4 or more, and even more preferably 6 or more, from the viewpoints of imparting a transparent to translucent appearance and improving the moisturizing feeling on the skin after application, and is preferably 20 or less, more preferably 15 or less, and even more preferably 12 or less. The constituent fatty acids of the polyglycerol fatty acid ester may be saturated or unsaturated, and are preferably saturated from the viewpoints of making the appearance transparent to translucent and improving the moisturizing feeling on the skin after application.Furthermore, the number of carbon atoms is preferably 2 or more, more preferably 12 or more, and preferably 22 or less, and more preferably 20 or less. Furthermore, the esterification rate of the polyglycerol fatty acid ester (esterification rate relative to all hydroxy groups) is preferably 4% or more, more preferably 5% or more, and even more preferably 8% or more, from the viewpoint of making the appearance transparent to translucent and improving the moisturizing feeling on the skin after application, and is preferably 75% or less, more preferably 60% or less, and even more preferably 50% or less.

[0009] Examples of polyglycerol fatty acid esters include decaglycerol fatty acid esters such as polyglyceryl-10 stearate, polyglyceryl-10 distearate, polyglyceryl-10 tristearate, polyglyceryl-10 pentastearate, polyglyceryl-10 oleate, polyglyceryl-10 dioleate, polyglyceryl-10 isostearate, polyglyceryl-10 diisostearate, polyglyceryl-10 myristate, and polyglyceryl-10 laurate; octaglycerol fatty acid esters such as deca(behenic acid / capric acid)polyglyceryl-8; hexaglycerol fatty acid esters such as polyglyceryl-6 stearate; tetraglycerol fatty acid esters such as polyglyceryl-4 stearate; and diglycerol fatty acid esters such as polyglyceryl-2 stearate. Of these, from the viewpoints of imparting a transparent to translucent appearance and improving the moisturizing feeling on the skin after application, it is preferable to contain one or more selected from hexaglycerin fatty acid esters, octaglycerin fatty acid esters, and decaglycerin fatty acid esters, more preferably to contain one or more selected from decaglycerin fatty acid esters, even more preferably to contain one or more selected from polyglyceryl-10 diisostearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate, and polyglyceryl-10 dioleate, and even more preferably to contain polyglyceryl-10 diisostearate.

[0010] One or more types of component (A) can be used, and from the viewpoints of imparting a transparent to translucent appearance, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application, the content is preferably 0.05 to 10 mass% of the total composition, more preferably 0.1 to 7 mass%, even more preferably 0.25 to 4 mass%, and even more preferably 0.4 to 2 mass%.

[0011] Component (B) is polyoxyethylene hydrogenated castor oil with an HLB of 10 to 20. In the present invention, HLB is an index showing the hydrophile-lipophile balance, and is defined by the following formula proposed by Oda and Teramura et al.

[0012] HLB = (Σinorganic value / Σorganic value) × 10

[0013] From the viewpoints of imparting a transparent to translucent appearance, improving storage stability at high temperatures, and improving the moisturizing feeling on the skin after application, the polyoxyethylene hydrogenated castor oil has an HLB of 10 to 20, preferably 10 to 16, more preferably 11 to 15.5, even more preferably 12 to 15, and even more preferably 12.5 to 14.5. In addition, in the polyoxyethylene hydrogenated castor oil, the average number of added moles of polyoxyethylene chains constituting the polyoxyethylene hydrogenated castor oil is preferably 25 to 100, more preferably 35 to 85, even more preferably 45 to 75, and even more preferably 55 to 65, from the viewpoints of making the appearance transparent to translucent, improving storage stability at high temperatures, and improving the moisturizing feeling on the skin after application.

[0014] Specific examples of the polyoxyethylene hydrogenated castor oil of component (B) include polyoxyethylene (30 E.O.) hydrogenated castor oil (HLB: 11.0), polyoxyethylene (40 E.O.) hydrogenated castor oil (HLB: 12.5), polyoxyethylene (50 E.O.) hydrogenated castor oil (HLB: 13.5), polyoxyethylene (60 E.O.) hydrogenated castor oil (HLB: 14.0), polyoxyethylene (80 E.O.) hydrogenated castor oil (HLB: 15.0), and polyoxyethylene (100 E.O.) hydrogenated castor oil (HLB: 16.5).

[0015] The polyoxyethylene hydrogenated castor oil of component (B) may be a commercially available product or one synthesized by a conventional method. Polyoxyethylene hydrogenated castor oil is obtained by adding ethylene oxide to hydrogenated castor oil. Commercially available products that can be used include NIKKOL HCO-30, NIKKOL HCO-40, NIKKOL HCO-50, NIKKOL HCO-60, NIKKOL HCO-70, NIKKOL HCO-80, and NIKKOL HCO-100 (all manufactured by Nikko Chemicals Co., Ltd.), EMANON CH-40, and EMANON CH-60(K) (all manufactured by Kao Corporation).

[0016] Component (B) can be used alone or in combination with two or more types, and from the viewpoints of imparting a transparent to translucent appearance, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application, the content is preferably 0.05 to 10 mass% of the total composition, more preferably 0.1 to 7 mass%, even more preferably 0.3 to 5.5 mass%, and even more preferably 0.45 to 2 mass%.

[0017] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably 0.1 to 2.5, more preferably 0.2 to 2, even more preferably 0.3 to 1.7, and even more preferably 0.7 to 1.6, from the viewpoints of making the appearance transparent to translucent, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application.

[0018] The dihydric alcohol of component (C) is a compound having two hydroxyl groups in the molecule, and may be any of those commonly used in cosmetics. Examples of the dihydric alcohol of component (C) include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, butylene glycol, and propanediol. Among these, from the viewpoints of making the appearance transparent to translucent and improving storage stability at high temperatures, it is preferable to contain one or more selected from propylene glycol, dipropylene glycol, and 1,3-butylene glycol, and it is more preferable to contain dipropylene glycol.

[0019] Component (C) can be used alone or in combination with two or more types, and from the viewpoints of improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application, the content is preferably 0.1 to 50 mass% of the total composition, more preferably 1 to 30 mass%, and even more preferably 5 to 15 mass%.

[0020] In the present invention, the mass ratio (A) / (C) of component (A) to component (C) is preferably 0.01 to 5, more preferably 0.012 to 3, even more preferably 0.015 to 2, even more preferably 0.035 to 0.57, and particularly preferably 0.045 to 0.12, from the viewpoints of making the appearance transparent to translucent, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application.

[0021] In the present invention, the mass ratio (B) / (C) of component (B) to component (C) is preferably 0.01 to 5, more preferably 0.012 to 3, even more preferably 0.015 to 2, even more preferably 0.02 to 1.5, and particularly preferably 0.04 to 0.44, from the viewpoints of making the appearance transparent to translucent, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application.

[0022] The trihydric alcohol of component (D) is a compound having three hydroxyl groups in the molecule, and may be any of those commonly used in cosmetics. Examples of the trihydric alcohol of component (D) include glycerin and trimethylolpropane. Among these, it is preferable to include glycerin, from the viewpoint of making the appearance transparent to translucent and improving the ease of application to the skin.

[0023] Component (D) can be used alone or in combination with two or more types, and from the viewpoints of imparting a transparent to translucent appearance, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application, the content is preferably 0.1 to 50 mass% of the total composition, more preferably 1 to 30 mass%, even more preferably 2 to 15 mass%, and even more preferably 5 to 8.5 mass%.

[0024] In the present invention, the mass ratio (C) / (D) of component (C) to component (D) is preferably 0.1 to 10, more preferably 0.5 to 5, and even more preferably 0.85 to 2, from the viewpoints of making the appearance transparent to translucent, improving storage stability at high temperatures, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application.

[0025] In the present invention, the content of water as component (E) is preferably 40 to 99% by mass, more preferably 55 to 95% by mass, and even more preferably 70 to 90% by mass of the total composition, from the viewpoints of imparting a transparent to translucent appearance, improving compatibility with the skin upon application, and improving the moisturizing feeling of the skin after application.

[0026] In order to impart a transparent to translucent appearance to the skin cosmetic of the present invention and improve storage stability at high temperatures, the content of oils in the total composition is preferably 0.5% by mass or less, more preferably 0.2% by mass or less, even more preferably 0.1% by mass or less, and even more preferably zero.

[0027] In addition to the above-mentioned components, the skin cosmetic of the present invention may contain components commonly used in cosmetics, such as surfactants other than those mentioned above, antioxidants, fragrances, preservatives, pH adjusters, blood circulation promoters, cooling agents, antiperspirants, disinfectants, skin activators, moisturizers, and refreshing agents.

[0028] The skin cosmetic of the present invention can be produced according to a conventional method, for example, by the following method. (1) Add component (A) to a portion of component (C) and mix while heating to obtain Preparation 1. (2) Add component (B) to a portion of component (C) and mix while heating to obtain Preparation 2. (3) Preparation 1 and Preparation 2 are mixed and stirred using a propeller stirrer to obtain Preparation 3. (4) Purified water is added to Preparation 3 and stirred with a propeller stirrer, and then the remainder of Component (C) and Component (D) are added and stirred with a propeller stirrer to produce a skin cosmetic.

[0029] The skin cosmetic of the present invention has a transparent to translucent appearance. Transparent to semi-transparent means that the transmittance is 50% or more, preferably 50 to 98%, more preferably 60 to 90%, and even more preferably 70 to 80%. In the present invention, the transmittance is measured using UV-1800 (Shimadzu) at λ=550 nm by placing the skin cosmetic in a PMMA cell (optical path length 10 mm, BRAND).

[0030] The cosmetic of the present invention is suitable as a solubilized cosmetic, preferably an aqueous liquid cosmetic, more preferably a lotion. [Example]

[0031] Examples 1 to 9, Comparative Examples 1 to 3 Skin cosmetics (lotions) were prepared with the compositions shown in Table 1, and were evaluated for appearance (transmittance), high-temperature stability, ease of application to the skin, and moisturizing feeling on the skin after application. The results are also shown in Table 1.

[0032] (Manufacturing method) (1) Component (A) was added to a portion of component (C) and mixed while heating to 60°C to obtain Preparation 1. (2) Component (B) was added to a portion of component (C) and mixed while heating to 80°C to obtain Preparation 2. (3) Preparation 1 and Preparation 2 were mixed and stirred for 5 minutes using a propeller stirrer to obtain Preparation 3. (4) Purified water was added to Preparation 3 and stirred with a propeller stirrer for 5 minutes, after which the remainder of Component (C) and Component (D) were added and stirred with a propeller stirrer for 5 minutes to obtain a skin cosmetic (lotion).

[0033] (Evaluation method) (1) Appearance (transmittance): For each skin cosmetic, the transmittance at λ=550 nm was measured using UV-1800 (Shimadzu) by placing each skin cosmetic in a PMMA cell (optical path length 10 mm, BRAND).

[0034] (2) High temperature stability: 20 g of each skin cosmetic was filled into a transparent glass bottle (Mighty Vial No. 6, Maruemu Co., Ltd.) and stored in a thermostatic chamber at 60°C for one week. After removing from the thermostatic chamber and leaving at 25°C for four hours, the appearance was visually observed and evaluated according to the following criteria. 4: No change in appearance. 3: Whiteness increases slightly, but this is not noticeable when you hold it in your hand. 2: The whiteness increases and the change can be seen when you hold it in your hand. 1: Separation or creaming present.

[0035] (3) Ease of application to the skin: Three cosmetic expert evaluators took 0.05g of each skin care product, spread it on the back of their hand for 10 seconds, and performed a sensory evaluation of how easily it blended into the skin according to the following criteria. The results were shown as the total score given by the three evaluators. 5: Very familiar. 4: Easy to get used to. 3: Somewhat familiar. 2: Hard to get used to. 1: Very difficult to adapt.

[0036] (4) Moisturizing feeling on skin after application: Three expert cosmetic evaluators took 0.05g of each skin cosmetic product, spread it on the back of their hand for 10 seconds, and then performed a sensory evaluation of the moisturizing feeling on the skin according to the following criteria. The results are shown as the total score of the three evaluators. 5: Very moisturizing. 4: Moisturizing. 3: Slightly moisturizing. 2: Not very moisturizing. 1: No moisturizing feeling.

[0037] [Table 1]

[0038] *1 Decaglyceryl diisostearate (Polyglyceryl-10 distearate): Matsunate MI-102, manufactured by Matsumoto Fine Chemical Co., Ltd. *2 Polyoxyethylene (60E.O.) hydrogenated castor oil: NIKKOL HCO-60, manufactured by Nikko Chemicals, HLB14, *3 Polyoxyethylene (10E.O.) hydrogenated castor oil: NIKKOL HCO-10, manufactured by Nikko Chemicals, HLB 6.5, *4 Dipropylene glycol: DPG-RF, manufactured by ADEKA Corporation *5 Concentrated glycerin: RG·Co·K (External Standards), manufactured by NOF Corporation

[0039] Prescription examples 1-4 In the same manner as in Examples 1 to 9, skin cosmetics having the compositions shown in Tables 2 to 5 were produced by conventional methods. All of the skin cosmetics have an external transmittance of 50% or more, are transparent to translucent, have excellent storage stability at high temperatures, are easily absorbed into the skin upon application, and provide a moisturizing feeling after application.

[0040] [Table 2]

[0041] [Table 3]

[0042] [Table 4]

[0043] [Table 5]

[0044] *6 Polyoxyethylene (40E.O.) hydrogenated castor oil: NIKKOL HCO-40, manufactured by Nikko Chemicals, HLB 12.5, *7 Decaglyceryl isostearate (polyglyceryl-10 isostearate): S-Face IS-601P, manufactured by Sakamoto Pharmaceutical Co., Ltd. *8 Polyoxyethylene (80E.O.) hydrogenated castor oil: NIKKOL HCO-80, manufactured by Nikko Chemicals, HLB 15.0, *9 Decaglyceryl dioleate (Polyglyceryl-10 dioleate): Sunsoft Q-172Y-C, manufactured by Taiyo Kagaku Co., Ltd. *10 Polyoxyethylene (100E.O.) hydrogenated castor oil: NIKKOL HCO-100, manufactured by Nikko Chemicals, HLB 16.5

Claims

1. The following components (A), (B), (C), (D) and (E): (A) polyglycerol fatty acid ester, (B) polyoxyethylene hydrogenated castor oil having an HLB of 10 to 20, (C) a dihydric alcohol, (D) a trihydric alcohol, (E) Water A skin cosmetic composition containing the above and having a transparent to semi-transparent appearance.

2. 2. The skin cosmetic according to claim 1, wherein the mass ratio (A) / (B) of component (A) to component (B) is 0.1 to 2.

5.

3. 3. The skin cosmetic according to claim 1, wherein the mass ratio (B) / (C) of component (B) to component (C) is 0.01 to 5.

4. 3. The skin cosmetic preparation according to claim 1, wherein the component (C) comprises one or more selected from the group consisting of propylene glycol, dipropylene glycol and 1,3-butylene glycol.

5. 3. The skin cosmetic preparation according to claim 1, wherein component (A) comprises one or more selected from polyglyceryl-10 diisostearate, polyglyceryl-10 isostearate, polyglyceryl-10 oleate and polyglyceryl-10 dioleate.

6. 3. The skin cosmetic preparation according to claim 1, wherein the content of component (A) is 0.05 to 10% by mass.