JP2005232092A - Emulsion foundation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-in-oil type emulsion foundation hardly causing irritation on the skin, and providing high ultraviolet-protecting effects and makeup effects. <P>SOLUTION: This water-in-oil type emulsion foundation contains 2-50 mass% powder containing a hydrophobized inorganic ultraviolet-scattering agent and a colored pigment, and is regulated so that the water phase separated from the emulsion may have pH 4-6.4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water-in-oil emulsified foundation having low skin irritation and having a high UV protection effect and makeup effect.

  A foundation is a cosmetic that covers skin defects such as spots, freckles, uneven color, and pores with powder, etc., and makes the skin look beautiful. Among them, the water-in-oil emulsified foundation is known to have high covering power, good skin familiarity, and easy to obtain water repellency, water resistance and sweat resistance. In addition, foundations are often used outdoors during the day, and in order to prevent the adverse effects such as skin blackening and inflammation caused by ultraviolet rays, in addition to the above-mentioned makeup effects, they also have an ultraviolet protective effect. Have.

  On the other hand, in recent years, many people are suffering from skin diseases such as atopic dermatitis and stress, and even people who are not affected by normal skin condition may cause skin troubles when the skin is sensitive. A lower foundation of irritation was desired.

Therefore, generally, in order to obtain a low-irritant emulsion, a method of reducing the content of these components or replacing them with other components and making the pH near neutral has been taken. For example, Patent Document 1 discloses water for sensitive skin, which has a pH of less than 7 and contains an alkyl-modified carboxy polymer and a nonionic surfactant of HLB 3-7 having fluidity at 1 atm. An oil-type emulsification foundation is described. However, a water-in-oil emulsion is advantageous for maintaining a high UV protection effect and makeup effect, and it is necessary to hydrophobize the inorganic UV scattering agent. On the other hand, as a method for improving emulsification stability in the formulation of a water-in-oil emulsified cosmetic, a salt having a neutral pH has been blended (Patent Document 2). However, while still having a high UV protection effect and makeup effect, it was not sufficient to reduce skin irritation.
JP-A-11-246356 JP-A-9-87160

  It is an object of the present invention to provide a water-in-oil emulsified foundation that has low skin irritation and has a high UV protection effect and makeup effect.

  When the water-in-oil emulsion contains a hydrophobized inorganic ultraviolet scattering agent and a color pigment, and the aqueous phase in the emulsion is adjusted to pH 4 to 6.4, the present invention It has been found that it is low in irritation and has a high UV protection effect and makeup effect.

  The present invention provides a water-in-oil type emulsion foundation containing 2 to 50% by mass of an inorganic ultraviolet scattering agent and a color pigment, and having a pH of an aqueous phase separated from an emulsion of 4 to 6.4. .

  The water-in-oil type emulsification foundation of the present invention has low irritation to the skin when applied, is less prone to skin troubles such as irritation and itchiness, and has a high UV protection effect only with an inorganic UV scattering agent. A makeup effect that covers skin spots, freckles, uneven color, pores, and the like can be obtained.

  In the water-in-oil type emulsion foundation of the present invention, the pH of the water phase separated from the water-in-oil emulsion is 4 to 6.4, so that the foundation is weakly acidic and more sensitive to irritation than usual. Even if the skin condition is, the irritation to the skin can be kept low. In addition, the UV protection effect is high and the makeup effect is also excellent.

  The inorganic ultraviolet scattering agent used in the present invention is preferably a powder having an average particle diameter of 0.001 to 0.15 μm, particularly 0.003 to 0.1 μm, and the shape thereof is, for example, granular, spherical, or spindle Shape, dendritic shape, balloon shape and the like, preferably granular, spherical and spindle-shaped. In addition, an average particle diameter says the average value of the particle diameter measured with the electron micrograph.

  Examples of the inorganic ultraviolet scattering agent include metal oxides such as titanium oxide, zinc oxide, and cerium oxide, and silicon carbide. Of these, titanium oxide and zinc oxide are preferable, and these contain 0.5 to 3% by mass of a divalent or higher metal such as iron, zirconium, and magnesium for the purpose of reducing whitening and improving the UV protection effect. It is also possible to use what has been done.

  One or more inorganic ultraviolet scattering agents can be used, and 1 to 30% by mass, particularly 3 to 20% by mass in the total composition shows a sufficient ultraviolet protection effect and is a stable emulsion composition. It is preferable to obtain In the present invention, a sufficient protective effect can be obtained without using an organic ultraviolet absorber.

Examples of the color pigment used in the present invention include inorganic pigments such as iron oxide (Bengara), yellow iron oxide, black iron oxide, carbon black, titanium dioxide, ultramarine blue, and bitumen; red 201, red 202, red 226, Organic pigments such as yellow 401 and blue 404; lake pigments such as red 104, red 230, yellow 4, yellow 5 and blue 1 are included.
1 or more types can be used for a color pigment, and it is preferable to contain 1-20 mass% in the whole composition, 2-15 mass% especially, and also 3-10 mass%.

  In the present invention, the inorganic ultraviolet scattering agent and the color pigment are subjected to hydrophobic treatment. As the hydrophobization treatment, methods that are applied to ordinary cosmetic powders using various hydrophobizing treatment agents, such as silicone treatment, fatty acid treatment, lauroyllysine treatment, surfactant treatment, metal soap treatment, Fluorine compound treatment, lecithin treatment, nylon treatment, polymer treatment and the like are included, and among them, silicone treatment, fatty acid treatment and fluorine compound treatment are preferable.

  Specifically, as the silicone treatment, for example, treatment with methylhydrogenpolysiloxane, methylpolysiloxane, trimethylsiloxysilicic acid, silicone resin, etc .; as the fatty acid treatment, treatment with myristic acid, stearic acid, etc .; fluorine compound treatment Examples of the treatment include treatment with pearl fluoroalkyl phosphate ester, perfluoroalkyl silane and the like.

  The amount of the hydrophobizing agent used is preferably 0.5 to 70% by mass, particularly 2 to 40% by mass, based on the mass of the powder before the treatment. Examples of the hydrophobic treatment method include a method in which a solution obtained by dissolving a hydrophobic treatment agent in a solvent and powder are mixed and dried, and a method in which powder and a hydrophobic treatment agent are mixed and heated.

  In addition, when hydrophobizing titanium oxide and zinc oxide, the powder surface is pretreated with aluminum oxide, silicon oxide, zirconium oxide, etc., and the hydrophobizing treatment is performed after suppressing the activity of the powder surface. Is preferred. In order to obtain a suitable hydrophobized powder, the pretreatment agent is preferably used in an amount of 0.5 to 20% by mass with respect to the amount of powder before the treatment.

Examples of such commercially available hydrophobized UV scattering agents include MT-500T, SMT-500SAS (Takeka), TTO-55 series, TTO-51 series, TTO-S, TTO-V series ( Titanium oxide such as Ishihara Sangyo Co., Ltd .; MZ30
Examples thereof include zinc oxides such as 0 series, MZ500 series, and MZ700 series (above, Teica).

  In the present invention, the content of the inorganic ultraviolet scattering agent and the color pigment is 2 to 50% by mass in total in the total composition, and preferably 3 to 40% by mass. Within this range, it is possible to obtain a cosmetic which is excellent in UV protection effect and make-up sustainability, has a good dispersion state of powders such as pigments and has excellent emulsion stability. On the other hand, if the amount is less than 2% by mass, sufficient UV protection effect and makeup effect cannot be obtained, and if it exceeds 50% by mass, a stable emulsion is hardly obtained.

  The emulsification foundation of the present invention includes, in addition to the inorganic ultraviolet scattering agent and the coloring pigment, powders used in ordinary cosmetics, for example, extender pigments such as talc, sericite, kaolin, mica; bentonite, hydroxyapatite, barium sulfate Inorganic powder such as boron nitride; titanium oxide coated mica, titanium oxide coated talc, colored titanium oxide coated mica, titanium oxide / silica / titanium oxide coated mica, titanium oxide coated glass powder, iron oxide / titanium oxide coated glass powder, oxidation Pearl pigments such as titanium coated silica powder, iron oxide coated silica powder, titanium oxide coated alumina, iron oxide / silica coated aluminum powder, iron oxide / silica coated iron oxide, titanium oxide coated synthetic mica, iron oxide / titanium oxide coated synthetic mica Nylon, polyester, polymethyl methacrylate, polyethylene, polyethylene Terephthalate, polyurethane, silicone resin, silk, cellulose laminated film powder (lame material), may contain an organic powder such as Nε- lauroyl -L- lysine. Further, these powders may be hydrophobized in the same manner as described above.

  The aqueous phase of the emulsification foundation of the present invention is mainly composed of water. As an aqueous phase component other than water, for example, in addition to polyhydric alcohols such as 1,3-butylene glycol and glycerin, water-soluble components usually used in cosmetics can be contained. The aqueous phase is preferably contained in the total composition in an amount of 5 to 70% by mass, particularly 10 to 50% by mass.

  In the water-in-oil type emulsion foundation of the present invention, the pH of the aqueous phase separated from the emulsion is 4 to 6.4, preferably 5 to 6.4 at 25 ° C. When the pH of the aqueous phase separated from the emulsion is within this range, the emulsion foundation has weak acidity, that is, the water-in-oil emulsion has weak acid-like properties. It is mild to the skin, and it is difficult for people with weak skin to feel irritation and itching.

  Since the pH of the aqueous phase separated from the emulsion is affected by the types and contents of inorganic ultraviolet scattering agents and other components, such as polar oils, contained in the emulsion foundation, It is believed that the pH of the phase is different. In order to adjust the pH of the aqueous phase separated from the emulsion to 4 to 6.4, the pH of the aqueous phase dispersed in the oil phase is adjusted using a general pH adjusting method, for example, a pH adjusting agent. It can be adjusted by doing so. The pH adjuster to be used preferably has a pH of 6.4 or less when a 1% by mass aqueous solution is used because it is easy to blend. Moreover, when using together 2 or more types of pH adjusters, it is preferable that pH is 6.4 or less when the density | concentration as a composition of a pH adjuster shall be 1 mass%.

As the pH adjuster, it is preferable to use at least one selected from organic acids, inorganic acids and salts thereof.
Examples of organic acids include acrylic acid, ascorbic acid, benzoic acid, adipic acid, succinic acid, acetic acid, oxalic acid, nicotinic acid, propionic acid, pyrrolidone carboxylic acid, fumaric acid, phthalic acid, malonic acid, butyric acid, aspartic acid And glutamic acid.

Examples of inorganic acids include hydrochloric acid, nitric acid, nitrous acid, sulfuric acid, sulfurous acid, phosphoric acid, phosphonic acid, phosphinic acid, and the like.
Examples of the salt of organic acid or inorganic acid include alkali metal salts such as sodium, potassium, magnesium and the like, and specifically, trisodium phosphate, disodium succinate, disodium hydrogen phosphate, diphosphate diphosphate. Examples thereof include sodium hydrogen, potassium dihydrogen phosphate, dipotassium hydrogen phosphate and the like.

  The organic acid is preferably adipic acid, succinic acid, oxalic acid, fumaric acid, malonic acid, aspartic acid or glutamic acid, and the inorganic acid is hydrochloric acid, sulfuric acid or phosphoric acid because it can be adjusted to a more stable and weakly acidic pH. The organic acid or inorganic acid salt is preferably sodium dihydrogen phosphate or potassium dihydrogen phosphate.

  Moreover, as a pH adjuster, if the pH of the aqueous phase separated from the emulsion foundation is adjusted to 4 to 6.4 and the pH is stable, components other than organic acids, inorganic acids or salts thereof may be included. Well, for example, the pH can be stabilized by further adding a base such as sodium hydroxide, potassium hydroxide, triethanolamine, lysine or arginine and using the aqueous phase as a buffer solution.

  Examples of the oily component contained in the oily continuous phase constituting the water-in-oil type emulsion foundation of the present invention include liquid, semi-solid and solid, synthetic and naturally-derived oily components generally used in cosmetics, such as hydrocarbons. Oils, ester oils, animal and vegetable oils, fatty acids, higher alcohols, ether oils, silicone oils, fluorine oils and the like are included.

  Specifically, hydrocarbon oils such as liquid paraffin, squalane and petrolatum; fatty acid ester oils such as isostearyl octoate, neopentyl glycol dicaprate and diglyceride; vegetable oils such as olive oil, soybean oil and castor oil; beeswax, lanolin and the like Animal oils; fatty acids such as stearic acid and oleic acid; higher alcohols such as cetanol and stearyl alcohol. The silicone oil includes volatile and non-volatile silicone oils such as dimethylpolysiloxane, methylcyclopolysiloxane, methylphenylpolysiloxane, highly polymerized methylpolysiloxane, alkyl-modified silicone, amino-modified silicone, and acrylic silicone. Etc. Furthermore, fluorine-modified silicones such as fluorine ether and perfluoroalkyl ether silicone can be used as the fluorine oil.

  One or more of these oily components can be used, and it is preferably contained in the total composition in an amount of 10 to 80% by mass, particularly 20 to 60% by mass, and more preferably 25 to 55% by mass.

Further, in the present invention, a surfactant can be used as an emulsifier. For example, polyoxyethylene / methylpolysiloxane copolymer, poly (oxyethylene / oxypropylene) methylpolysiloxane copolymer, cross-linked polyether-modified silicone, cross-linked alkyl polyether-modified silicone, cetyl dimethicone copolyol, monostearin Propylene glycol acid, sorbitan monooleate, glyceryl stearate, polyoxyethylene hydrogenated castor oil, polyoxyethylene alkyl ether, sorbitan sesquioleate, diglyceryl monooleate and the like can be suitably used.
The surfactant is preferably contained in the whole composition in an amount of usually 0.1 to 10% by mass, particularly 0.2 to 5% by mass.

  The emulsification foundation of the present invention further contains components used in normal cosmetics, for example, humectants such as sugars, amino acids, ceramides and ceramide-like structural substances; physiological activities such as vitamins, nucleic acids, plant extracts, etc. Ingredients: thickener, polymer, dispersant, stabilizer, dye, colorant, flavoring agent, preservative, antioxidant, chelating agent, blood circulation promoter, cooling agent, antiperspirant, fungicide , Skin activator and the like can be contained.

The emulsification foundation of the present invention can be prepared in various forms such as emulsion, cream, and semisolid by a known method capable of water-in-oil emulsification.
Moreover, it is preferable not to contain C2-C4 alcohols, for example, ethanol, propanol, etc.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Evaluation method>
(1) Aqueous pH of emulsified foundation:
After centrifuging each emulsified foundation 5 g by ultracentrifugation (70,000 rpm, 30 minutes), the pH (25 ° C.) of the separated aqueous phase was measured with a pH meter.

(2) Skin irritation:
The emulsified foundation was applied to the faces of 10 female panelists (persons who had rashes in the foundation), and daily life (applied for 8 hours) was performed. Thereafter, skin irritation was evaluated according to the following criteria for the following items, and the value obtained by dividing the total number of skin irritation indices by the number of people was defined as the skin irritation index average value. Furthermore, from the calculated average value of skin irritation index, it was shown as a comprehensive evaluation of skin irritation.

(Evaluation item)
Symptoms: erythema, edema, irritation, itching.
(Skin irritation index)
Index value Skin condition 0: No symptoms were observed.
1: Slightly symptomatic.
2: Clearly symptomatic.
3: Significant symptoms occurred.
(Skin irritation comprehensive evaluation)
○: Skin irritation index average value of 0 or more and 0.9 or less.
Δ: Skin irritation index average value of 1.0 or more and 1.9 or less.
×: Skin irritation index average value of 2.0 or more.

(3) UV protection effect:
The SPF value of each emulsified foundation was measured using an SPF analyzer (Labsphere, UV-1000S).

(4) Finish:
Ten professional panelists used each emulsification foundation, sensory-evaluated the covering power of color unevenness such as spots, freckles, dullness, and pores, and judged according to the following criteria.
(Criteria)
A: 8 or more responded as good.
○: 5-7 responded that they were good.
Δ: 2 to 4 people answered good.
×: 1 or less responded good.

Examples 1-4 and comparative examples 1-2 (milky foundation)
An emulsion foundation having the composition shown in Table 1 was produced, and the aqueous phase pH, skin irritation, UV protection effect, and finish of the obtained foundation were evaluated. The results are also shown in Table 1.

(Manufacturing method)
After the components (4) to (13) are uniformly dispersed with a disper (2000 rpm, 15 minutes), an oil phase obtained by uniformly mixing and dissolving the components (1) to (3) at 70 ° C. is added, The oil phase includes powder. This was emulsified by adding components (14) to (20) (aqueous phase) uniformly dissolved at 70 ° C. and finally stirred with a homomixer (7000 rpm, 5 minutes), and then water-in-oil emulsification. I got a foundation.

  From the results of Table 1, the water-in-oil type emulsion foundation of the present invention has a pH of 4 to 6.4 in the water phase separated from the obtained emulsion, has low skin irritation, and is inorganic. Only the UV scattering agent showed a high UV protection effect and the finish was good.

Example 5 (Cream Foundation)
A cream foundation having the composition shown in Table 2 was produced.
The aqueous phase separated from the obtained cream foundation had a pH of 5.9, had little irritation to the skin, had a high UV protection effect, and had a good finish.

(Manufacturing method)
Components (6) to (13) were uniformly dispersed with a disper (2000 rpm, 15 minutes). Thereto, components (1) to (5), which were previously mixed and dissolved uniformly at 70 ° C., are added to obtain an oil phase. An aqueous phase in which components (14) to (18) were uniformly dissolved at 70 ° C. was added to the oil phase and stirred with a homomixer (7000 rpm, 5 minutes) to obtain a water-in-oil emulsion foundation.

Claims (6)

  A water-in-oil emulsion foundation containing 2 to 50% by mass of an inorganic ultraviolet scattering agent and a color pigment that have been subjected to a hydrophobic treatment, and having a pH of 4 to 6.4 in the aqueous phase separated from the emulsion.   The inorganic ultraviolet scattering agent is at least one selected from hydrophobized titanium oxide and hydrophobized zinc oxide having an average particle size of 0.001 to 0.15 μm, and the content of the inorganic ultraviolet scattering agent is 1 to 30% by mass. The water-in-oil emulsion foundation according to claim 1, wherein the content of the color pigment is 1 to 20% by mass.   Furthermore, the water-in-oil type emulsion foundation of Claim 1 or 2 containing at least 1 sort (s) chosen from organic acid, inorganic acid, and these salts.   Organic acids, inorganic acids and their salts are from adipic acid, succinic acid, oxalic acid, fumaric acid, malonic acid, aspartic acid, glutamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, sodium dihydrogen phosphate and potassium dihydrogen phosphate The water-in-oil type emulsion foundation according to claim 3, which is at least one selected.   The water-in-oil emulsification foundation according to any one of claims 1 to 4, wherein the organic acid, the inorganic acid, and a salt thereof are pH adjusters.   The water-in-oil emulsification foundation according to any one of claims 1 to 5, which does not contain an alcohol having 2 to 4 carbon atoms.