JPH0826932A - Skin external composition - Google Patents

Abstract

PURPOSE:To obtain a skin external composition, excellent in ultraviolet protect ing effect and long acting property of its effect, having good feeling of slip, covering power, etc., to user and useful for cosmetics, medicines for external use, etc. CONSTITUTION:The skin external composition contains (a) 1.0-50wt.% of pigment consisting of at least one or more substances selected from a group of titanium oxide powder, zinc oxide powder, fine-particle titanium oxide powder and fine particle zinc oxide powder to which water-repellent and oil-repellent treatment is applied and (b) 0.5-30wt.% of silicone rubber elastic powder to which water- repellent and oil-repelling treatment is applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The external composition for skin of the present invention is an external composition for skin, such as cosmetics and external medicines, which has an excellent UV protection effect and a long-lasting effect, and has a good feeling in use such as spreading and sticking. Regarding

[0002]

2. Description of the Related Art Conventionally, problems to be solved by the invention
Titanium oxide and zinc oxide are used as white pigments in cosmetics. Further, these pigments have an ultraviolet protection effect, and in particular, fine particle titanium oxide and fine particle zinc oxide are generally used for imparting an ultraviolet protection effect to cosmetics because they are effective in the protection of ultraviolet rays. There is. However, these pigments have a high cohesive property and have a squeaky feeling when applied to the skin, and therefore, when they are mixed in a large amount to enhance the ultraviolet protection effect in cosmetics and the like, they have a drawback that the feel becomes poor. In addition, since the refractive index of light is high, there is a problem of usability such that the concealing property becomes high when used in a large amount, resulting in an unnatural makeup finish, and the compounding amount is limited.

[0003]

Under the above circumstances, the present inventor has solved the problems of titanium oxide, zinc oxide, and / or particulate titanium oxide and particulate zinc oxide, and has a high UV protection effect for external use on the skin. To get things
As a result of earnest research, powders obtained by subjecting pigments such as titanium oxide, zinc oxide, particulate zinc oxide, and particulate zinc oxide to water and oil repellency treatment, and silicone rubber elastic powders subjected to water and oil repellency treatment It has been found that the above problems can be solved by using together, and further, it was found that the durability of the ultraviolet protection effect can be improved, and the present invention has been completed.

That is, the present invention provides (a) at least one pigment selected from the group consisting of titanium oxide powder, zinc oxide powder, fine titanium oxide powder, and fine zinc oxide powder, which has been subjected to a water / oil repellency treatment. 1.0 to 50% by weight, and (b) 0.5 to 30% by weight of water-repellent and oil-repellent treated silicone rubber elastic powder, which are effective in protecting ultraviolet rays and sustaining the effect. It is an object of the present invention to provide a composition for external use on the skin, such as cosmetics and external medicines, which is excellent and has a good feeling in use such as spreading and sticking.

The titanium oxide, zinc oxide, fine particle titanium oxide and fine particle zinc oxide constituting the component (a) in the present invention are not particularly limited, and powders generally used in cosmetics, pharmaceuticals and the like can be used. Is.

Examples of the silicone rubber elastic powder which constitutes the component (b) include elastic powder made of a polymer having a dimethylsiloxane skeleton. The shape of these elastic powders is not particularly limited, but preferably has an average particle size of 0.1 to 500 μm, and particularly preferably 0.1 to 50 μm in use. The particles may be monodisperse particles, powder particles in which primary particles are partially connected to form higher-order particles, or may be porous or non-porous, but the squeaky sensation may be reduced. Since it is used as a cushioning agent for the above, a powder that is porous and has primary particles partially connected to form higher order particles is preferable in terms of obtaining higher elasticity. Examples of the elastic powder include Trefill E-500, Trefill E-501, Trefill E-505, Trefill E-506, Trefill E-600, Trefill E-601, and Trefill manufactured by Toray Dow Corning Co., Ltd.
E-602, Trefill E-603, Trefill E
-850 etc. are mentioned.

As the water- and oil-repellent treatment of the components (a) and (b), for example, coating treatment with a fluorine compound can be performed. Examples of the fluorine compound capable of imparting water and oil repellency, perfluoroalkyl phosphoric acid, perfluoroalkylethyl phosphate ester salt, perfluoroalkylsilane, a resin having a perfluoroalkyl group,
Examples thereof include tetrafluoroethylene resin and perfluoroalcohol, and commercially available products include Asahi Guard AG530 manufactured by Asahi Glass Co., Ltd.

The method of coating the powder with a fluorine compound is not particularly limited, but for example, water is added to the mother powder to be treated to form a slurry state, and the fluorine compound treating agent is added to water and stirred to form an emulsion state. After gradually adding and mixing the above ingredients, the mixture can be allowed to stand at normal temperature or high temperature to break the emulsion, and the powder surface can be coated with a fluorine compound for treatment. If this is washed, filtered and dried, a water and oil repellent powder is obtained.

The blending amount of the component (a) in the present invention is capable of imparting an ultraviolet protection effect and preventing deterioration of feeling such as a squeaky feeling when applied to the skin. The amount is preferably 1.0 to 50% by weight, and more preferably 5.0 to 30% by weight, which is a range in which the unnaturalness is increased.

The compounding ingredient of the component (b) in the present invention can prevent the squeaky feeling of titanium oxide and fine particle titanium oxide, and further, the feel and finish are not powdery, and the moldability is in a good range. The amount is preferably 0.5 to 30% by weight, more preferably 1.0 to 20% by weight.

The components (a) and (b) in the present invention may be blended separately, or the components (a) and (b) may be mixed and the mixed powder may be blended to obtain the same effect. Obtainable. Further, the same effect can be obtained by mixing the mother powder of each of the components (a) and (b) first and then mixing the mother powder with the water / oil repellency treatment by the above-mentioned method.

The method of mixing the components (a) and (b) is not particularly limited. For example, a method of stirring with a V-type mixer, a ribbon mixer, a Henschel mixer, etc., and then crushing with a hammer mill, pin mill, etc. Examples thereof include a method of performing, a method of using a crusher such as a ball mill and a crusher that also serves as a mixer, and a method of processing by a closed multistage shear shear extruder. Among these methods, the method of treating with a closed multistage shear shear extruder is particularly preferable from the viewpoint of dispersibility, uniformity and treatment efficiency of the mixed powder.

In addition to the above-mentioned components, the external composition for skin according to the present invention contains iron oxide, mica, talc, sericite, kaolin, bentonite, silica, alumina, calcium carbonate, magnesium carbonate, barium sulfate, cobalt blue, ultramarine blue and navy blue. , Manganese violet, titanium coated mica, bismuth oxychloride, magnesium oxide, zirconium oxide, boron nitride, magnesium aluminate silicate, inorganic pigments such as aluminum powder, acrylic resin, polyester resin, fluororesin, polyethylene resin, nylon resin, etc. Organic pigments, organic dyes such as Red No. 202, biopolymers such as keratin powder, collagen powder, silk powder, cellulose powder, and chitosan powder can be blended.
It is also possible to use a powder in which these pigments are composited, and further to use the above-mentioned powder with a method such as oil treatment, metal soap treatment, silicone treatment, water / oil repellency treatment, lecithin treatment, and resin coating. It is also possible to perform surface treatment before blending.

Further, in the present invention, solid, semi-solid,
Alternatively, a liquid oily raw material can be blended, and an oil agent and a surfactant generally used in cosmetics can also be blended. As the oil agent, for example, liquid paraffin, squalane, petrolatum, polyisobutylene,
Isopropyl myristate, glyceryl monostearate, coconut oil fatty acid triglyceride, ethyl alcohol,
Examples thereof include propylene glycol, stearyl alcohol, hexadecyl alcohol, palmitic acid, lauric acid, stearic acid, sorbitol, maltitol, various waxes, dimethylpolysiloxane, methylphenylpolysiloxane, perfluoropolyether and the like. Further, it is also possible to blend a main ingredient component used in pharmaceuticals and the like, an ultraviolet absorber, a preservative, a fragrance, an antioxidant, a beauty ingredient such as a moisturizer, and the like. These compounding ingredients may be determined according to the dosage form of cosmetics, external medicines, etc., but usually 1 to 95% by weight is preferable, and more preferably 5 to 75%.
% By weight.

The external composition for skin of the present invention can be produced by stirring and mixing the respective components at room temperature, as in the case of existing cosmetics and external medicines. No equipment required.

[0016]

In the present invention, in order to suppress the squeaky feeling of titanium oxide, zinc oxide, fine particle titanium oxide and fine particle zinc oxide, a silicone rubber elastic body having a high refractive index of light is blended to obtain silicone. The rubber elastic body absorbs the frictional stress at the time of application and imparts an appropriate adhesive force to the skin to enhance the feeling of use. Furthermore, a transparent layer is applied to the decorative coating film to give it a natural texture. However, titanium oxide, zinc oxide, particulate titanium oxide, particulate zinc oxide, and silicone rubber elastic body have low surface tension and are easily wetted by sebum as they are, so the refractive index of the powder is reduced and the whiteness is lowered. However, there is a problem that makeup discoloration generally called "dullness" occurs. Further, in the case of fine particle powder, the cohesiveness of the powder is high, and in the case of powder particles having a large apparent particle size due to the coagulation, the ultraviolet protection effect is reduced. Therefore, by surface-treating titanium oxide, zinc oxide, fine particle titanium oxide, fine particle zinc oxide, and further, a silicone rubber elastic body with a fluorine compound having water / oil repellency, each powder is less likely to be wetted by sebum. , It becomes difficult to cause a decrease in the refractive index of the powder. Furthermore, since the free energy on the powder surface is reduced by the surface coating treatment with a fluorine compound, the agglomeration of the powder particles is released,
Since the dispersibility becomes more excellent, the ultraviolet protection effect is further excellent. Therefore, it is apparent to provide a composition for external application to the skin, which is excellent in ultraviolet protection effect and sustainability of the effect, and has a good feeling in use such as spreading and sticking, which is applicable to cosmetics, external medicines and the like.

The dosage form of the external composition for skin of the present invention includes:
Examples thereof include white powder, foundations, blusher, cream, emulsion, etc., but are not particularly limited.

[0018]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto. In addition,
For the water and oil repellent treatment in the present invention, Asahi Guard AG530 manufactured by Asahi Glass Co., Ltd. was used as a treatment agent, and a treatment amount of 5% was used.

Example 1, Comparative Example 1 (powdered white powder) (prescription)

[0020]

[Table 1]

(Manufacturing method) The respective raw materials were uniformly mixed and filled in a container to obtain a white powder.

Examples 2-4, Comparative Examples 2-4 (powder foundation) (prescription)

[0023]

[Table 2]

[0024]

[Table 3]

(Production method) The same as in Example 1.

Example 5, Comparative Example 5 (blushing) (prescription)

[0027]

[Table 4]

(Production method) The same as in Example 1.

Example 6, Comparative Example 6 (oil foundation) (prescription)

[0030]

[Table 5]

(Production method) The same as in Example 1.

[Evaluation Method] 1. Sensory test Using 10 female panelists, after washing the face, applying the examples and comparative examples, feeling of use (stickiness / spreadiness, powderiness, friction feeling), finish (transparency), and lasting makeup after 3 hours The sex was evaluated according to the evaluation criteria shown in Table 6.

(Evaluation criteria)

[Table 6]

2. Sunburn suppression confirmation test In an all-weather laboratory equipped with an artificial solar lamp (solar UV light simulator 600 type, manufactured by Solarlight), 2
A sunburn suppression confirmation test was carried out on the compositions of Examples and Comparative Examples using 10 female panelists aged 0 to 35. The composition was applied to the face and irradiated for 10 minutes, and the sunburn state was visually observed 1, 24 and 48 hours after irradiation.

The results of the sensory test are shown in Table 7.

[0036]

[Table 7]

From Table 7, the following can be seen. That is,
In comparison with Comparative Example 1, Example 1 has the result that the friction feeling during application is not felt. Moreover, Examples 2 to 4 are Comparative Examples 2 to 4.
Compared with, the finish was transparent, and the cosmetic effect lasted well. Furthermore, although Examples 5 and 6 are examples of blusher and oily foundation,
All of them showed a good feeling in use, finish, and durability of makeup.

The results of the sunburn suppression confirmation test are shown in Table 8.

[0039]

[Table 8]

As shown in Table 8, no sunburn was observed in each of the examples. On the other hand, each comparative example slightly recognized sunburn. Therefore, it is clear that the composition of the present invention exhibits an excellent UV protection effect, and since it contains a component which has been subjected to a water / oil repellency treatment, the effect is also excellent in sustainability.

Claims (4)

[Claims] 1. A component selected from the group consisting of the following components (a) and (b) (a) water- and oil-repellent treated titanium oxide powder, zinc oxide powder, fine titanium oxide powder, and fine zinc oxide powder. 1.0 to 50% by weight of at least one pigment component (b) 0.1 to 20 μm average particle diameter after water and oil repellency treatment
The external composition for skin is characterized by containing 0.5 to 30% by weight of a silicone rubber elastic powder of m. 2. A pigment component of at least one selected from the group consisting of titanium oxide powder, zinc oxide powder, fine titanium oxide powder, and fine zinc oxide powder 2.0 to 2.0.
50% by weight and 0.5 to 30% by weight of an elastic powder of silicone rubber having an average particle size of 0.1 to 20 μm are mixed to obtain a mixed powder, and a powder obtained by subjecting the powder to water and oil repellency treatment The external composition for skin. 3. A mixed powder obtained by treating a silicone rubber elastic powder subjected to a water and oil repellency treatment and a pigment component with a closed multistage shear shear extruder to mix the powder.
The external composition for skin as described. 4. A mixed powder obtained by mixing an elastic powder of silicone rubber and a pigment component and subjecting it to a water- and oil-repellent treatment, and treating the mixed powder with a closed multistage shear shear extruder. The external composition for skin according to claim 2.