JPH0696494B2 - Cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cosmetic having a novel feel, and has a light elongation on the skin, a smoothness, and an excellent adhesion and hiding power. It concerns cosmetics.

Conventionally, titanium dioxide has been widely used as a white pigment having a hiding power in cosmetics, and is useful for covers such as spots and freckles and sunscreens. However, cosmetics containing titanium dioxide tend to spread significantly on the skin, which not only reduces the feeling of use, but also causes unevenness and deteriorates the cosmetic finishing effect. It was This tendency becomes more remarkable as the blending amount of titanium dioxide increases, so that there is a contradictory relationship with the above-mentioned concealment effect, which is a problem.

Conventionally, various attempts have been made to solve the above problems. That is, a method of using surface-treated titanium dioxide obtained by coating the surface of titanium dioxide with an inorganic substance such as alumina, silica, iron oxide yellow or an organic substance such as a higher fatty acid or a salt thereof (JP-A-59-98009). issue),
(Japanese Patent Laid-Open No. 58-49307), a method using fine particle titanium dioxide (Japanese Patent Laid-Open No. 58-49307), and the like, the former method using surface-treated titanium dioxide spreads and spreads on the skin. Is not sufficiently improved, and it is not excellent in uniformity at the time of application and the effect of cosmetic finish. In the latter method using fine particle titanium dioxide, the adhesion and uniformity are good, but the smoothness of elongation on the skin is rather a moist and heavy type.

Therefore, in view of the present situation, it is an object of the present inventors to provide a cosmetic composition containing titanium dioxide, which overcomes the above-mentioned problems and has a low elongation and is smooth when applied to the skin.

Therefore, as a result of earnest research to achieve the above object, by incorporating titanium dioxide, which has a property of disintegrating on the skin by physical pressure, into cosmetics, it has a unique and excellent organoleptic property which has never been obtained. It was found that various properties such as hiding power, sunscreen effect and adhesion can be achieved at the same time, and the present invention has been completed.

That is, the present invention relates to cosmetics containing disintegratable titanium dioxide.

The present invention will be described in detail below.

Disintegrating titanium dioxide applied to the present invention, when applied on the skin, has the property of disintegrating by pressure or friction with fingers or puffs, etc. It achieves a novel feel that has never been seen before. This unique organoleptic property will be described later in detail, but the most remarkable effect is that the skin has a mellow gliding stretch when applied on the skin. Further, when further spread, a vanishing sensation that disappears can be obtained.

On the other hand, particles of titanium dioxide, which is a white pigment conventionally used in cosmetics, have an amorphous or polyhedral shape and do not have the property of disintegrating, and are compared with plate-like powders such as talc. However, since the elongation is remarkably heavy, the property is fundamentally different from the disintegrating titanium dioxide applied to the present invention.

For reference, an electron micrograph of the disintegratable titanium dioxide is shown in FIG. 1 below. As shown in FIG. 1, the disintegrating titanium dioxide applied to the present invention has a form in which fine particulate titanium dioxide is densely packed, and is usually spherical particles.
Here, the process of forming fine particles of titanium dioxide and aggregating to form disintegrating titanium dioxide is performed in series in the manufacturing process, and thus it is difficult to measure individual fine particles. However, from the electron micrograph shown in FIG. 1, it is presumed that fine particles of titanium dioxide having an average particle diameter of about 100 mμ are aggregated to form disintegrating titanium dioxide.

It is impossible to obtain such a substance by modifying the conventional titanium dioxide by a physical method or forming it into secondary particles. Of course, the above-mentioned disintegratable titanium dioxide does not have to be completely disintegrated at the time of being applied on the skin, and the fact that undisintegrated titanium dioxide remains on the skin rather brings about a favorable usability. or,
The disintegrating titanium dioxide is not particularly limited in its particle shape, but is generally a spherical powder, and in this case, the disintegrating titanium dioxide which is a spherical particle disintegrates while rolling. Therefore, it provides the smoothest and lightest touch feeling, which is the most preferable in the present invention.

Next, the average particle size of the disintegratable titanium dioxide is arbitrarily selected according to the properties of the cosmetic to be blended, and for example, in powdery cake-like foundations and powdered cosmetics, which have a relatively large particle size. (1 to 30 μm) is used as a makeup cosmetic having good adhesion and a fine texture, and a relatively small particle size (0.2 to 5 μm). Therefore, as the disintegrating titanium dioxide, those having an average particle diameter of 0.2 to 30 μm are used. When the average particle size is less than 0.2 μm, the difference in particle size between the particles before disintegration and the particles after disintegration is small, and it is difficult to feel the novel sensory characteristics peculiar to the present invention. On the other hand, if it exceeds 30 μm, the adhesiveness is deteriorated when the cosmetic is used, and a feeling of discomfort on the touch surface is likely to occur, which is not preferable.

As described above, the disintegratable titanium dioxide is widely applicable to cosmetics that require the use of powders, and thus, the cosmetics provided by the present invention include liquid foundations, powder foundations and cakes. Foundation, stick foundation, face powder, lipstick, blusher, eyeliner,
Makeup cosmetics such as eye shadows and eyebrow pencils are listed, as well as body powders, antiperspirants,
Sunscreen cream, whitening powder, emulsion, lotion, etc.,
It can be applied in a wide variety of ways. Among the above-mentioned cosmetics, solid foundations such as cake foundations and stick foundations are particularly preferable in the present invention because they have the most remarkable effect of improving the feel when applied to the skin.

Next, the method of compounding is to disintegrate titanium dioxide as it is or to coat the surface with a known substance into a surface-treated powder, and compound it in a cosmetic composition in the same manner as in the case of compounding a conventional inorganic pigment. You can Examples of the above surface-treated powder include, for example, a silicone oil agent, a higher fatty acid or a salt thereof, a higher fatty acid ester, a lecithin or a hydrogenated lecithin for the surface of disintegrating titanium dioxide in order to improve water resistance and sweat resistance. The surface of disintegrating titanium dioxide is coated with yellow iron oxide, red iron oxide, silica, alumina, etc. to prevent surface-treated powder coated with Examples of the surface-treated powder are:

Further, the blending amount is arbitrarily selected according to the properties of the cosmetic,
Approximately 0.5-40% by weight for liquid foundations, approximately 1-60% by weight for cake foundations, approximately 1.5-75% by weight for powder foundations, approximately 1-95% by weight for face powders, approximately 0.5% for creams.
Is about 20 to 20% by weight, and therefore is usually about 0.5 to 95% by weight, preferably 2 to 75% by weight, based on the total weight of the cosmetic.

In addition to the above-described disintegratable titanium dioxide, the cosmetics according to the present invention include additives usually used in cosmetics, such as oils and fats, waxes, surfactants, antioxidants, fragrances, dyes, pigments, Powders, alcohols, polyhydric alcohols, preservatives, medicinal components, ultraviolet absorbers, chelating agents, water, moisturizers, thickeners and the like can be added.

Next, a method for producing the disintegrating titanium dioxide applied to the present invention will be described.

The above-mentioned disintegratable titanium dioxide can be obtained by some known methods, for example, dilute hydrochloric acid is gradually added to an ice-cooled aqueous solution of titanium tetrachloride with stirring to give a strongly acidic titanium tetrachloride solution, and further sodium sulfate is added. In addition, titanium sulfate is used. Next, this solution is slowly heated to a temperature of about 90 ° C to 100 ° C, left to stand for 6 to 20 days while continuing to be heated and stirred to age the hydrous titanium oxide sol, and then allowed to cool. The spherical hydrous titanium oxide sol thus obtained was washed with water by decantation or the like and, if necessary, subjected to ultrasonic treatment or the like to disperse, filtered, washed with water to remove ionic substances, and then obtained. Dry the titanium oxide,
Further, this is roasted at about 750 ° C to obtain disintegrating titanium dioxide, titanium sulfate is mixed and dissolved in purified water, and this is further heated and hydrolyzed to refine the hydrous titanium oxide sol, and further heated. Continue to concentrate until gelled. Next, add the above gel-like substance to a non-polar organic solvent to which a small amount of a surfactant has been added in advance, mix and stir, and slowly warm to 60 ° C while continuing stirring, and then for about 5 hours. After continuing stirring, the organic solvent is removed by decantation, etc., and the washing with water is repeated 2 to 3 times to remove inorganic ions and the like, and further washing with methyl alcohol etc., followed by drying to obtain a spherical titanium oxide sol. . Next, a method of obtaining a collapsible titanium dioxide by firing this at a temperature of 850 ° C. or lower can be mentioned. Here, the above-mentioned firing temperature is an important factor. For example, when fired at 850 ° C. or higher, most of titanium oxide is transformed into rutile type, and the disintegrating property is lost. or,
The lower the calcination temperature, the higher the ratio of anatase type and the greater the disintegration tendency. Therefore, it is possible to obtain titanium dioxide having a desired disintegrating property depending on the intended use. Furthermore, in addition to this, it is possible to manufacture by a spray granulation method, a fluidized granulation method, or the like.

An example of producing disintegratable titanium dioxide is shown below.

Production Example-1 190 g of titanium tetrachloride was added little by little to 10 liters of ice-cooled 0.5N dilute hydrochloric acid while stirring to dissolve uniformly, and 50 g of sodium sulfate was added little by little to dissolve. Next, this solution is slowly heated to about 98 ° C., allowed to stand for 10 days, and then allowed to cool to form spherical hydrous titanium sol, and decantation causes Cl ⁻ and SO ₄ ²⁻ ions to become trace amounts. After washing and dispersing by ultrasonic treatment, vacuum filtration and washing are carried out to collect hydrous titanium oxide. Then this
After drying at 120 ℃ for 1 day, roasting at 750 ℃ for 3 hours, white powdery disintegrating titanium dioxide (average particle size 0.4μm) 75g
Got

(Yield 94%) Production Example-2 200 g of titanium (II) sulfate is mixed and dissolved in 500 ml of purified water, and mixed and stirred at a temperature of about 50 ° C for 4 hours, and further mixed and stirred while warming slowly, and gel state. Concentrate until Next, to the solution prepared by dissolving 20 g of sorbitan monooleate in 4 liters of n-decane in advance, the above gel-like substance was added with mixing and stirring, and the mixture was stirred and heated slowly to 60 ° C. Then, after stirring for about 5 hours,
After removing n-decane by decantation or the like, washing with water is repeated three times, further washing with methyl alcohol, and then drying. The spherical titanium oxide sol thus obtained was calcined at 680 ° C. for 3 hours to obtain 60 g of collapsible titanium dioxide.

(Yield 91%) The disintegrating titanium dioxide can be obtained by the above-mentioned method, etc., but of course, as described above, the disintegrating titanium dioxide can be used in the present invention. It is not limited to the example. Further, the above-mentioned disintegratable titanium dioxide is commercially available, and these can also be used. Examples of such materials include disintegratable titanium dioxide manufactured by Catalyst Kasei Co., Ltd., and the like.

Next, the slip resistance value when the above-mentioned disintegratable titanium dioxide was applied onto the skin was measured and is shown in Table 1 below. At this time, conventional titanium dioxide was used as a control product. The smaller the resistance value, the better the slip and elongation on the skin. The test method is as follows.

<Sample> * 1 Disintegrating titanium dioxide of Production Example 1 (average particle size 0.4 μm) * 2 Disintegrating titanium dioxide (manufactured by Catalysts & Chemicals Co., Ltd.) (Average particle size 5 μm) * 3 Conventional titanium dioxide (average (Particle size 0.4 μm) <Test method> Make a 4 x 5 cm site on the relatively flat part of the inner part of the upper arm, and apply 0.1 g of the sample evenly to it (about 0.005 g / cm ² ).
A stainless steel hemispherical measuring head connected to a slip resistance measuring device was pressed against the site with a pressure of 20 g / cm ² , and the resistance value when the head was slowly slid horizontally was taken as the slip resistance value. When the sample is not applied (blank), the slip resistance value is about 35g.

As described above, the collapsible titanium dioxide applied to the present invention has a very low slip resistance value when applied on the skin as compared with the conventional product, that is, the elongation is smooth and uniform. Moreover, it gives the skin a smooth feeling. On the other hand, the conventional titanium dioxide has a clear increase in the slip resistance value of the skin as compared with the case where no powder is applied (blank). The difference in the slip resistance between the two on the skin is remarkable in the sensory test,
Compared to the disintegrating titanium dioxide applied to the present invention, which gently spreads on the skin, the conventional titanium dioxide is
It feels heavy and snagging.

This difference in the slip resistance, when applied to cosmetics,
It appears as a difference in various characteristics including sensory characteristics. Therefore, as described above, it is preferable to select and use a particle size or a disintegrating property according to the properties of the cosmetic.

Next, the cosmetics (Examples 1 and 2) applied to the present invention were subjected to sensory evaluation, and the results are shown in Table 2. At this time, as a control product, each cosmetic was prepared by blending conventional titanium dioxide instead of the disintegrating titanium dioxide used in the present invention, and sensory-evaluated.

The test method is as follows.

Sensory test: 30 women were panelists, and after using the cosmetics as a sample for 14 days by any method, the sensory evaluation items were smoothness, adhesion to the skin, growth on the skin, and hiding power. The items were evaluated according to the following criteria, and the average value of 30 persons was used as the evaluation point.

As described above, the cosmetic composition applied to the present invention has good elongation when applied on the skin, is smooth, and has excellent sensory properties such as adhesion to the skin and hiding power. Moreover, the disintegrating titanium dioxide gradually disintegrates as it is spread, so that an unprecedented vanishing feeling can be obtained. Further, considering the ultraviolet shielding effect and high safety, it is understood that the disintegrating titanium dioxide used in the present invention is a powder having excellent properties not found in conventional cosmetic pigments. .

Next, examples of the present invention will be described.

Example-1 Liquid Foundation (parts by weight) (A) Liquid paraffin 10 Vaseline 5 Isopropyl myristate 3 Cetanol 1 Stearic acid 2 Glycerin monooleate 0.5 POE (25) Monostearate 1.5 (B) Yellow iron oxide 1.5 Red iron oxide 0.5 Black oxide Iron 0.2 Disintegratable titanium dioxide of Production Example 1 15 Talc 3 (C) Propylene glycol 5 Glycerin 5 Potassium hydroxide 0.2 Ethylparaben 0.2 Perfume 0.3 Purified water 46.1 (Production method) The formulation of the above A was uniformly applied at 75-80 ° C. Dissolve and mix, and add the above-mentioned formulation B mixed with a mixer and crushed,
Disperse with stirring to obtain a dispersion. To the dispersion, the above-mentioned formulation C was uniformly dissolved and mixed at 75 to 80 ° C., and gradually added with stirring to obtain an emulsified dispersion. This is cooled to 30 ° C to obtain a product.

Example-2 Solid Foundation Weight Part (A) Liquid Paraffin 13 Isopropyl myristate 0.5 Sorbitan Monooleate 0.3 Dimethylpolysiloxane 3 Perfume 0.2 Glycerin 1 (B) Yellow Iron Oxide 2 Rouge 0.8 Ultramarine 0.2 Disintegrating Titanium Dioxide * ² 40 Silicone-coated sericite 20 Talc 14 Silk powder 4 Titanium mica 1 (Manufacturing method) High speed mixer (Hensiel type mixer) of the above-mentioned formulation B
Pulverize and mix with a mixer and pulverizer for 2 minutes. This product is mixed with the above-mentioned formulation A at 80 ° C. for 5 minutes at a low speed in a Hensiel mixer, cooled to 20 ° C., and press-molded in a medium plate with a press to obtain a product.

Example-3 Face powder (parts by weight) (A) Yellow iron oxide 1 Rouge 0.4 Ultramarine 0.1 Disintegrating titanium dioxide 8 in Production Example 1 Disintegrating titanium dioxide 8 in Production Example 8 Sericite 34 Talc 40 Aluminum stearate 3.5 Titanium Mica 0.5 (B) Dimethylpolysiloxane 4 Perfume 0.5 (Production method) A high-speed mixture of the above-mentioned formulation A (Hensiel type mixer)
After mixing for 2 minutes, crush and mix with a crusher. This product is mixed with the above-mentioned formulation B at low speed in a Hensiel mixer for 5 minutes, and then press-molded in a medium plate by a press machine to obtain a product.

Example-4 Sunscreen parts by weight (A) Disintegratable titanium dioxide 25 Yellow iron oxide 1.3 Rouge 0.3 Black iron oxide 0.2 (B) Candelilla wax 5 Carnauba wax 5 Paraffin 4 Castor oil 50 Olive 10 Paramethoxycinnamic acid Isopropyl 1 (Production method) The formulation of the above A is thoroughly mixed with a mixer and then pulverized and mixed with a pulverizer. Next, this is added to a mixture prepared by heating and dissolving the above-mentioned formulation B at 90 ° C., further mixing and stirring, and this is poured into a mold, and after cooling, a solid substance is taken out and mounted in a container to obtain a product. .

Example-5 Cake Eye Color Part by weight (A) Kaolin 5.0 Zinc stearate 3.5 Silicone coating disintegrating titanium dioxide * ² 46.5 Black iron oxide 4.0 Rouge 10.0 Mica titanium 8.0 Beeswax 1.5 Cetanol 0.8 Liquid paraffin 2.5 Perfume 0.2 (Production method) High speed mixer (Hensiel type mixer)
After mixing for 2 minutes, crush and mix with a crusher. This is slowly mixed with the formulation of B at 80 ° C. in a Hensiel mixer for 5 minutes, cooled to 20 ° C., the flavor of C is added, and the mixture is mixed at low speed for 2 minutes. This product is crushed by a crusher, then taken out and pressed.

[Brief description of drawings]

FIG. 1 is an electron micrograph (magnification: 20000 times) of the disintegrating titanium dioxide (average particle diameter 5 μm) applied to the present invention.

Claims (6)

[Claims] 1. A cosmetic containing disintegratable titanium dioxide. 2. The cosmetic according to claim 1, wherein the total weight of the cosmetic contains 2 to 75% by weight of disintegrating titanium dioxide. 3. The cosmetic according to claim 1 or 2, wherein the disintegrating titanium dioxide is a spherical powder. 4. The disintegrating titanium dioxide has an average particle size of 0.2 to 3
The cosmetic according to any one of claims 1 to 3, which has a range of 0 μm. 5. The cosmetic according to any one of claims 1 to 4, wherein the cosmetic is a make-up cosmetic. 6. The cosmetic according to claim 5, wherein the make-up cosmetic is a solid foundation.