JP2007055944A - Cosmetic comprising composite particle for screening ultraviolet light formulated therein - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellently safe cosmetic for protection from ultraviolet light having high protecting effects on ultraviolet light, a good feeling of use and excellent stability even when using a large amount of inorganic particles as an ultraviolet light-screening material. <P>SOLUTION: The highly safe cosmetic for screening ultraviolet light in both the UV-A and the UV-B wavelength regions in good balance and having the excellent feeling of use with slight irritation to skin is obtained as follows. Composite particles in which a plurality of kinds of metal oxides for screening ultraviolet light in at least both the UV-A and the UV-B wavelength regions are dispersed and formed in single particles are formulated in the cosmetic. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to various forms of cosmetics such as powders, creams, and liquids containing composite particles for ultraviolet shielding formed by complexing a metal oxide having ultraviolet shielding ability.

  Sunlight broadly includes infrared rays having a wavelength range of 780 nm or more, visible rays having a wavelength range of 400 to 780 nm, and ultraviolet rays having a wavelength range of 400 nm or less. Among these, ultraviolet rays occupy 5 to 6% of sunlight reaching the earth, and are further classified into UV-A with a wavelength range of 320 to 400 nm, UV-B with 290 to 320 nm, and UV-C with 290 nm or less. The

  Conventionally, adverse effects on human bodies, particularly skin, due to ultraviolet irradiation are known. It is said that UV-A among ultraviolet rays does not cause a strong action, but penetrates to the back (deep part) of the skin and causes a blackening phenomenon accompanied by erythema, which is a main cause of skin aging. On the other hand, UV-B is said to be involved in the formation of skin cancer and wrinkles, and also causes stains, buckwheat and dry skin. In addition, since UV-C is absorbed by the ozone layer, it does not reach the ground surface.

  By the way, various ultraviolet shielding materials that absorb and shield the ultraviolet rays are known. Ultraviolet shielding materials are roughly classified into organic ultraviolet absorbers and inorganic particles. Examples of organic ultraviolet absorbers include benzophenone derivatives, methoxycinnamic acid derivatives, salicylic acid derivatives, and the like, which have an advantage that they are cheaper than inorganic materials and have excellent usability when applied to the skin.

Inorganic particles scatter or absorb ultraviolet rays to suppress absorption to the skin, and have a UV-B wavelength region shielding ability having a peak of absorbance in a wavelength region near 300 nm (TiO ₂ ), Zinc oxide (ZnO) having excellent UV-A wavelength band shielding ability having an absorbance peak in the wavelength region near 380 nm, and cerium oxide having excellent UV-A wavelength band shielding ability having an absorbance peak in the wavelength region near 400 nm It is a composite of a metal oxide such as (CeO ₂ ), and has the advantage of being superior in heat resistance and weather resistance as compared with an organic ultraviolet absorber.

  In order to protect the skin from the adverse effects of ultraviolet rays as described above, cosmetics containing an ultraviolet shielding material have been developed. Conventionally, organic UV absorbers that are inexpensive and have excellent usability have been used for cosmetics with a high UV protection effect. However, organic UV absorbers have insufficient heat resistance and weather resistance and are likely to change over time, and when exposed to the skin, there is a problem of irritation caused by the UV absorber itself or its decomposition products. Many cases that caused inflammation and the like have been reported.

  Therefore, various UV protective cosmetics containing inorganic particles having excellent stability and safety have been proposed. For example, Patent Document 1 discloses silica-coated zinc oxide obtained by combining amorphous oxide with zinc oxide. The powder foundation which mix | blended is disclosed. Patent Document 2 discloses a cosmetic in which a titanium-silica composite formed by incorporating titanium oxide into a silica carrier is blended. Patent Document 3 discloses a cosmetic containing a metal oxide silica composite in which metal oxide particles such as titanium oxide, zinc oxide and cerium oxide are finely dispersed with respect to silica particles. Has been.

  Patent Document 4 discloses a cosmetic containing an ultraviolet absorbent-containing composite powder obtained by coating a powder surface with a metal oxide gel containing an ultraviolet absorbent. Patent Document 5 discloses a cosmetic containing an inorganic powder composed of silica containing zinc oxide and talc, mica and / or sericite to which ultrafine titanium oxide and ultrafine titanium oxide are attached. Yes. Further, Patent Document 6 discloses cosmetics containing a fine particle metal oxide / cerium oxide composite having a predetermined whiteness, and Patent Document 7 discloses cerium oxide in which other metal element ions are dissolved (doped). Cosmetics containing the dissolved metal oxide solid solution cerium oxide are disclosed.

  Here, it is desirable to shield both UV-A and UV-B in order to develop the UV protection effect more reliably. However, in Patent Documents 1 and 2, only one of zinc oxide that blocks UV-A and titanium oxide that blocks UV-B is blended, so that it can be said that the ultraviolet protection effect is sufficient. There wasn't. Moreover, since the composite particles described in Patent Document 3 have a structure in which the respective metal oxide particles are aggregated, there is a possibility that the ultraviolet shielding ability is not uniform. In addition, the composite particles described in Patent Document 4 require a step of coating the powder surface, and use an organic ultraviolet absorber, which is not sufficient in terms of heat resistance and weather resistance. It was.

  In addition, in the cosmetic described in Patent Document 5, since silicon oxide particles enclosing zinc oxide and fine particle titanium oxide are blended separately, handling for uniformly dispersing each particle so that the particles do not aggregate becomes difficult. There was a possibility that the shielding ability would be uneven. In addition, since the composite particles described in Patent Documents 6 and 7 are not obtained by uniformly dispersing each metal oxide component in a single particle in view of the production method, UV-A and UV-B In order to shield the ultraviolet rays in both wavelengths in a well-balanced manner, it is necessary to uniformly disperse different composite particles so as not to agglomerate, making it difficult to handle the composite particles, and the total amount of the particle material, that is, the amount of use is small. There was an inconvenience of increasing.

Furthermore, the cosmetics described in the above-mentioned patent documents are highly active because the composite particles, which are inorganic ultraviolet shielding materials, are fine particles, and have a high frictional resistance and are not good to the touch. However, since further strengthening and feeling of touch are worsened, further improvements have been demanded in terms of the stability of the formulation and the feeling of use.
JP 11-193354 A JP 2000-344509 A International Patent Application Publication No. WO02 / 24153 JP 2000-44450 A JP-A-9-235217 JP 2000-203835 A JP 2002-160920 A

  In view of the above problems, the present invention provides a UV protection cosmetic that has a high UV protection effect, has good usability even when inorganic particles are used as a UV shielding material, and is excellent in stability and safety. The purpose is to do.

  In order to achieve the above object, according to the first configuration of the present invention, a plurality of types of metal oxide components that shield at least ultraviolet rays in both the UV-A and UV-B wavelength regions are dispersedly formed in a single particle. A composite particle is blended to make a cosmetic.

  Further, according to a second configuration of the present invention, in the cosmetic having the above-described configuration, the composite particle is any one of cerium oxide and zinc oxide as a metal oxide component excellent in ultraviolet shielding ability in a UV-A wavelength region, or Including both, titanium oxide is included as a metal oxide component excellent in ultraviolet shielding ability in the UV-B wavelength region, and silicon oxide is further included as a stable protective material component.

  Further, according to a third configuration of the present invention, in the cosmetic having the above configuration, the content ratio of each metal oxide component in the composite particles is such that the total of cerium oxide and zinc oxide is 40 wt% or more and 90 wt% or less. Titanium is in the range of 5 wt% to 20 wt%, and silicon oxide is in the range of 5 wt% to 40 wt%.

  According to a fourth configuration of the present invention, in the cosmetic having the above-described configuration, the composite particles have an average particle diameter of 10 nm to 300 nm.

  According to a fifth configuration of the present invention, in the cosmetic having the above-described configuration, the blending ratio of the composite particles is 2 wt% or more and 15 wt% or less.

  According to a sixth configuration of the present invention, in the cosmetic having the above-described configuration, the surface of the composite particle is subjected to a hydrophobic treatment.

  The seventh configuration of the present invention is characterized in that the cosmetic having the above-described configuration is a powder foundation further containing a colorant, talc, mica, titanium oxide, and an oil component.

  Moreover, the 8th structure of this invention is characterized by the cosmetics of the said structure being further the skin cream containing a paraffin and an oil component.

  A ninth configuration of the present invention is characterized in that the cosmetic having the above configuration is a pressed powder further containing a colorant, talc, resin powder, sericite, mica, and an oil component.

  The tenth configuration of the present invention is characterized in that the cosmetic having the above-described configuration is a liquid foundation further containing a colorant, bentonite, and an oil component.

  The eleventh configuration of the present invention is characterized in that the cosmetic having the above-described configuration is a lipstick that further contains a colorant, a wax, and an oil component.

  According to the first configuration of the present invention, composite particles in which a plurality of types of metal oxide components that shield ultraviolet rays in both the UV-A and UV-B wavelength ranges are uniformly dispersed in a single particle are blended. Therefore, the UV-A and UV-B wavelength ranges are shielded in a well-balanced manner, and the UV-shielding ability is small and has a high UV protection effect. Excellent UV shielding cosmetics are also provided.

  Further, according to the second configuration of the present invention, in the cosmetic of the first configuration, the composite particle is a metal oxide component excellent in ultraviolet shielding ability in the UV-A wavelength region, and cerium oxide and zinc oxide. Any one or both of the above, including titanium oxide as a metal oxide component excellent in UV shielding ability in the UV-B wavelength region, and further including silicon oxide as a stable protective material component, can be obtained by cerium oxide or zinc oxide. Effectively shields ultraviolet rays in the UV-A wavelength region and efficiently shields ultraviolet rays in the UV-B wavelength region with titanium oxide, while suppressing the catalytic activity of cerium oxide, zinc oxide, and titanium oxide with silicon oxide. The activity can be reduced, and adverse effects on the skin can be suppressed to further increase safety.

  According to the third configuration of the present invention, in the cosmetic of the second configuration, the total amount of cerium oxide and zinc oxide in the composite particles is 40 wt% or more and 90 wt% or less, and titanium oxide is 5 wt%. By adjusting the content to 20% by weight or less and silicon oxide to 5% by weight or more and 40% by weight or less, the UV shielding effect and the catalyst activity suppression effect in both the UV-A and UV-B wavelength ranges are adjusted to a preferable range. Can do.

  Further, according to the fourth configuration of the present invention, in the cosmetic having any one of the first to third configurations, the composite particle has an average particle diameter of 10 nm or more and 300 nm or less, thereby providing a high ultraviolet shielding effect. It becomes the cosmetics for ultraviolet shielding which has the outstanding usability.

  Further, according to the fifth configuration of the present invention, in the cosmetic having any one of the first to fourth configurations, the composite particles are mixed in an amount of 2 wt% or more and 15 wt% or less. Thus, there is no squeaky feeling due to the frictional resistance, and it is excellent in the feeling of use and has a sufficient ultraviolet protection effect.

  According to the sixth configuration of the present invention, in the cosmetic having any one of the first to fifth configurations, the surface activity of the composite particles is suppressed by hydrophobizing the surface of the composite particles. In addition, the affinity between the organic cosmetic raw material such as resin and oil and the composite particles that are inorganic is increased, and the dispersibility and stability of the composite particles in the cosmetic are improved.

  According to the seventh to eleventh configurations of the present invention, the cosmetic of any one of the first to sixth configurations is a powder foundation, skin cream, pressed powder, liquid foundation, or lipstick. In any of the above-mentioned cosmetics having different dosage forms, an excellent feeling of use and a remarkable ultraviolet shielding effect can be obtained.

In the composite particle for ultraviolet shielding used in the present invention, a plurality of types of metal oxides for shielding ultraviolet rays in both wavelength ranges of at least UV-A and UV-B are dispersedly formed in a single particle. . Specifically, the metal oxide component excellent in ultraviolet shielding ability in the UV-A wavelength range includes one or both of cerium oxide (CeO ₂ ) and zinc oxide (ZnO), and is in the UV-B wavelength range. Titanium oxide (TiO ₂ ) is included as a metal oxide component excellent in ultraviolet shielding ability, and silicon oxide (SiO ₂ ) is included as a stable protective material component.

  That is, in the composite particles used in the present invention, molecules or molecular aggregates of each of a plurality of types of metal oxides for shielding at least UV-A and UV-B wavelength regions are contained in a single particle. It exists in a dispersed manner and is composed of a certain composition ratio. Specifically, at least one of cerium oxide and zinc oxide, each of titanium oxide and silicon oxide molecules or molecular aggregates are dispersed in a single particle.

  Thereby, when a composite particle is mix | blended with cosmetics, the ultraviolet-ray of both wavelength range of UV-A and UV-B is shielded with sufficient balance. Moreover, since it is a single particle, it is easy to handle to uniformly disperse the particles so that they do not aggregate, and even if aggregation occurs, UV-A and UV-B are separately shielded from ultraviolet rays. Compared with the case where particles are mixed, the variation in the ultraviolet shielding effect in each wavelength region is reduced. As a result, the amount of composite particles used can be reduced as a whole.

  Moreover, since cerium oxide, zinc oxide, and titanium oxide have a catalytic activity, it is necessary to prevent and suppress deterioration of the skin, the base material, and the like due to the catalytic activity. In the present invention, by using composite particles in which silicon oxide is blended as a stable protective material component and the surface activity of cerium oxide, zinc oxide, and titanium oxide is suppressed, cosmetics with less irritation to the skin and high safety are obtained.

  The content ratio of the metal oxide component in the composite particles can be set as appropriate depending on the dominant wavelength range of the ultraviolet rays to be shielded, the feeling of use required for cosmetics, etc. When the total is less than 40% by weight, the UV-A wavelength region cannot be effectively shielded, and when the titanium oxide is less than 5% by weight, the UV-B wavelength region cannot be effectively shielded. On the other hand, if the titanium oxide exceeds 20% by weight, the squeaky feeling when using cosmetics due to surface activity increases. On the other hand, when the amount of silicon oxide is less than 5% by weight, the catalytic activity of cerium oxide, zinc oxide, and titanium oxide cannot be sufficiently suppressed, and the feeling of use of the cosmetic is deteriorated.

  Accordingly, the total of cerium oxide and zinc oxide is preferably in the range of 40 wt% to 90 wt%, titanium oxide 5 wt% to 20 wt%, and silicon oxide 5 wt% to 40 wt%. That is, by using the above blending ratio, it is possible to shield UV-A and UV-B wavelength regions in a well-balanced manner and to effectively suppress the surface activity. The composite particles have excellent shielding ability in the UV-A wavelength region, which has been difficult, and excellent usability when blended in cosmetics.

  In addition, as a metal oxide component that shields ultraviolet rays in the UV-A wavelength region in the composite particles, a metal oxide other than cerium oxide or zinc oxide may be included, and metal oxide that shields ultraviolet rays in the UV-B wavelength region. You may make it contain metal oxides other than a titanium oxide as a physical component. Moreover, you may make it contain metal oxides other than a silicon oxide as a stable protective material component.

  The composite particles used in the present invention can be produced using a conventionally known production method such as a gas phase reaction method or a combustion spray method. The outline of the method for producing composite particles by the gas phase reaction method will be described. The raw material liquid containing each metal component is prepared so that the metal oxide after the reaction has a predetermined composition ratio. Next, using a spray nozzle together with the reaction gas (oxygen gas), for example, the raw material liquid is sprayed into a reaction space in a high-temperature atmosphere generated by high-temperature plasma, and a droplet flow of the raw material liquid covered with the reaction gas flow is generated. At the same time, particle nucleation and particle growth are performed by evaporation of droplets, and then rapidly cooled with a surrounding cooling gas to produce composite particles of a predetermined size.

  The raw material liquid is an organic titanium compound such as tetra (2-ethylhexyl) titanate, an organic zinc compound such as zinc 2-ethylhexanoate, an organic cerium compound such as cerium 2-ethylhexanoate, or an organic silicon such as octamethylcyclotetrasiloxane. Prepared by dissolving the compound in petroleum hydrocarbon (mineral spirit).

  The average particle diameter of the composite particles produced in this manner is obtained by actually measuring the surface area (BET value) per unit weight of the composite particles and calculating the BET equivalent diameter from the BET value. When the average particle diameter of the composite particles exceeds 300 nm, the ultraviolet shielding effect is lowered, and the squeakiness is increased to deteriorate the feeling of use. On the other hand, when the average particle size of the composite particles is smaller than 10 nm, the particles are likely to aggregate and handling becomes difficult. Therefore, it is preferable to use composite particles having an average particle size of 10 nm or more and 300 nm or less, and in particular, when composite particles of 100 nm or less are used, a cosmetic having a higher ultraviolet shielding effect and an excellent usability can be obtained.

  In addition, examples of the dosage form of the cosmetic of the present invention include skin care cosmetics such as emulsions, lotions, skin creams, makeup cosmetics such as powder foundations, liquid foundations, and lipsticks, and cosmetics for hair. For example, when it is necessary to ensure transparency as in skin care cosmetics, the particle diameter of the composite particles is reduced, and the difference between the refractive index of the composite particles and the refractive index of other compounding materials as described later is reduced. There is a need. The refractive index of the composite particles becomes smaller as the content ratio of silicon oxide, which is as small as 1.5, and can be adjusted to some extent by the content ratio of silicon oxide.

  The blending ratio of the composite particles in the cosmetic can be arbitrarily set according to the required UV shielding effect, cosmetic dosage form, etc., but when the blending ratio of the composite particles is 2% by weight or less, A sufficient ultraviolet shielding effect cannot be obtained. On the other hand, when the blending ratio is 15% by weight or more, the squeaky feeling due to the frictional resistance of the particles increases, and the moldability deteriorates depending on the dosage form. That is, if the composite particles obtained by the above method are blended in cosmetics at a ratio of 2% by weight or more and 15% by weight or less, there is no squeaky feeling due to frictional resistance, and the use feeling is excellent, and an organic UV absorber is blended. A cosmetic material having a high UV protection effect can be obtained without the use of this.

  In addition, when compound particles are blended in cosmetics, those that have been surface-treated such as silicon treatment, amino acid treatment, lecithin treatment, collagen treatment, dialkyl phosphate treatment, fluorination treatment with a compound having a perfluoroalkyl group are used. May be. In particular, when the particle surface is hydrophobized by silicon treatment, the surface activity of the composite particles is suppressed, and the affinity between organic particles such as resins and oils and inorganic composite particles is increased, and the dispersibility in cosmetics is increased. And stability can be improved.

  Examples of the silicon compound used for the silicon treatment include methicone, dimethicone, and (dimethicone / methicone) copolymer. In addition, when surface treatment is performed using fluorine-modified silicon in which hydrogen atoms in the silicon compound are substituted with fluorine atoms or a fluorination treatment agent, the composite particles can be given oil repellency in addition to water repellency. Examples of the fluorination treatment agent include perfluoroalkyl phosphoric acid DEA.

  The cosmetics of the present invention include talc, mica, sericite, titanium oxide, silicic anhydride, kaolin, zinc oxide, mica titanium, iron oxide and other inorganic powders, polyester, polyethylene, polystyrene, polyurethane, acrylic resin, phenol resin , Various resin powders such as fluororesin, divinylbenzene, styrene copolymer or copolymer resin powders composed of two or more thereof, organic powders such as acetylcellulose, polysaccharides, proteins, red 202, red 226 Yellow 205, yellow 401, blue 1, blue 204, blue 404, etc., metal soap such as zinc stearate, magnesium stearate, zinc palmitate, dimethicone, methicone, cyclomethicone, polyether Silicon compounds such as modified silicon and fluorine-modified silicon, trioctanoy , Ester oils such as neopentyl glycol dicaprylate, tri (capryl / capric acid) glyceryl, (hydroxystearic acid / stearic acid / rosinic acid) dipentaerythrityl, hydrogenated isostearic acid castor oil, mineral oils, mineral oils such as petroleum jelly and polybutene , Wax such as carnauba wax, candelilla wax, beeswax, natural raw materials such as jojoba oil, olive oil, aloe, safflower, vitamin A, vitamin B, vitamin C, vitamin D, vitamin E, vitamin F, vitamin K, vitamin P, Vitamin U, vitamins such as dl-α-tocopherol acetate, nicotinic acid-α-tocopherol, succinic acid-α-tocopherol, and any inorganic or organic raw materials, or any ingredient that is usually blended in cosmetics Such as ethanol or Alcohols such as polyhydric alcohols, surfactants, humectants, colorants, flavors, preservatives, etc., can be blended within a range which does not impair the effects of the present invention.

  The present invention is not limited to the above-described embodiment and each example described later, and various modifications are possible within the scope shown in the section of means for solving the problem, and different embodiments and implementations are possible. Embodiments obtained by appropriately combining the technical means disclosed in the examples are also included in the technical scope of the present invention.

The raw materials are 9% by weight of tetra (2-ethylhexyl) titanate, 20% by weight of zinc 2-ethylhexanoate 65%, 40% by weight of cerium 2-ethylhexanoate 49%, and 2% by weight of octamethylcyclotetrasiloxane. A raw material liquid was prepared by mixing with 29% by weight of mineral spirits. Next, this raw material liquid is sprayed together with oxygen gas into a reaction space of about 3,000 ° C. generated by high-temperature plasma using a spray nozzle to generate a droplet flow covered with oxygen gas, After particle nucleation and particle growth by evaporative vaporization are performed, rapid cooling is performed with a surrounding cooling gas, and the composition ratio is 10 wt% TiO ₂ -30 wt% ZnO-50 wt% CeO ₂ -10 wt% SiO _2. As a result, composite particles for ultraviolet shielding were obtained.

When the BET value of the obtained composite particles was measured, it was 23 m ² / g, and the calculated BET diameter was 44 nm. The composite particles were further hydrophobized with methicone to obtain UV-shielding composite particles whose surface was hydrophobized.

As raw materials, 40% by weight of tetra (2-ethylhexyl) titanate, 30% by weight of 65% zinc 2-ethylhexanoate solution, and 2% by weight of octamethylcyclotetrasiloxane were mixed with 28% by weight of mineral spirit to prepare a raw material solution. did. Next, composite materials for ultraviolet shielding having a composition ratio of 45 wt% TiO ₂ -45 wt% ZnO-10 wt% SiO ₂ were produced by the same method as in Example 1 using this raw material solution.

The BET value of the obtained composite particles was measured to be 31 m ² / g, and the BET equivalent diameter was calculated to be 42 nm. The composite particles were further hydrophobized with methicone to obtain UV-shielding composite particles whose surface was hydrophobized.

  A powder foundation was produced by the following production method using the composite particles obtained in Example 1 and the components shown in Table 1. In addition, the material of methicone treatment in Table 1 is a methyl hydrogen polysiloxane coating raw material.

  The powder components described in A of Table 1 were stirred and mixed with a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.), and the heated mixture of the components described in B of Table 1 was added and further mixed to make uniform. This was treated with an atomizer, passed through a sieve, and then compression molded into a metal pan to obtain a powder foundation.

  Using the composite particles obtained in Example 2 and the components shown in Table 1 (excluding the composite particles obtained in Example 1), a powder foundation was produced under the same conditions as in the production method of Example 3. .

Comparative Example 1

  As a comparison with Examples 3 and 4, a methicone-treated talc was added in an amount of 5.0% by weight (in total, 11.2% by weight) instead of composite particles, and powdered under the same conditions as in the production method of Example 3 A foundation was produced.

  A skin cream was produced by the following production method using the composite particles obtained in Example 1 and the components shown in Table 2.

  The components described in A and B of Table 2 were heated and mixed at 80 ° C., respectively. To the heated mixture of the components described in A, add the heated mixture of the components described in B, and gradually cool to 30 ° C. with stirring with a homomixer (Homomixer Mark Series; manufactured by Special Machine Co., Ltd.). A cream was obtained.

  Using the composite particles obtained in Example 1 and the components shown in Table 3, a pressed powder was produced by the following production method.

  The components described in A of Table 3 were mixed with a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.) for about 10 minutes. The components described in B were added to the mixture and mixed for about 10 minutes, and further the components described in C were added and mixed for 1 minute. The obtained mixture was sieved to make the particle size uniform and then molded to obtain a pressed powder.

  A liquid foundation was produced by the following production method using the composite particles obtained in Example 1 and the components shown in Table 4.

  The components described in A, B, and C of Table 4 were heated and mixed at 80 ° C., respectively. The heated mixture of the components described in B is added to the heated mixture of the components described in A, then the heated mixture of the components described in C is added, and the components described in D are further added, and then gradually cooled to 40 ° C. . The resulting mixture was stirred for 5 minutes using a homomixer (Homomixer Mark Series; manufactured by Special Machine Co., Ltd.) and then cooled to 30 ° C. to obtain a liquid foundation.

  Using the composite particles obtained in Example 1 and the components shown in Table 5, lipstick was produced by the following production method.

  Ingredients described in A and B of Table 5 were heated and mixed at 80 ° C., respectively. The heated mixture was mixed, kneaded using a roll, and further dissolved by heating. The resulting melt was degassed under reduced pressure and then molded to obtain a lipstick.

A panel test was carried out by 20 panelists using the powder foundations obtained in Example 3 and Comparative Example 1, and sensory evaluation was performed on the spread, stickiness and moist feeling on the skin, and the following criteria were used. The results are shown in Table 6.
(Criteria)
◎: 15 or more people judged good ○: 10 or more people, less than 15 judged good △: 5 people or more, less than 10 people judged good

  As shown in Table 6, when the powder foundation of Example 3 was used, it was judged that 15 or more out of 20 people were good about the spread and adhesion on the skin, and the moist feeling was 10 or more and less than 15 people were good. Judgment and the result which was excellent in the usability were obtained. On the other hand, when the powder foundation of Comparative Example 1 was used, 10 or more of the 20 people and less than 15 people judged that the spread, stickiness, and moist feeling were all good.

  From this result, the powder foundation of the present invention containing the composite particles in which cerium oxide, zinc oxide, titanium oxide, and silicon oxide are dispersed in a single particle has a surface activity of the composite particles by silicon oxide and hydrophobization treatment. In addition to being suppressed, it was confirmed that there was no squeaky feeling due to frictional resistance and excellent usability. Although not described here, the powder foundation of Example 4 manufactured using composite particles in which zinc oxide, titanium oxide, and silicon oxide are dispersed in a single particle has the same effect as Example 3. It has been confirmed.

  The SPF (Sun Protection Factor) value and PA (Protection grade of UVA) value of the powder foundations obtained in Examples 3 and 4 and Comparative Example 1 were measured. The results are shown in Table 7.

  As shown in Table 7, in the powder foundation of Example 3, the SPF value was 31 and the PA value was +++. In the powder foundation of Example 4, the SPF value was 29 and the PA value was ++. On the other hand, in the powder foundation of Comparative Example 1, the SPF value was 25 and the PA value was ++.

  From this result, the powder foundation of the present invention shows that the SPF value representing the protective effect against UV-B and the PA value representing the protective effect against UV-A are both equal or higher than those in the comparative example. It was confirmed that ultraviolet rays in both wavelength ranges of -A and UV-B were effectively shielded.

  That is, from the results of Examples 9 and 10, according to the present invention, both the UV-A and UV-B wavelength shielding effects are high, and the shielding effect against UV-A and UV-B can be arbitrarily adjusted. It was possible to provide cosmetics that were smooth and smooth, and also excellent in the feeling of use. Although not described here, the same effect as in Example 4 has been confirmed for the powder foundation manufactured using composite particles in which cerium oxide, titanium oxide, and silicon oxide are dispersed in a single particle. .

  Since the cosmetic of the present invention contains composite particles in which the components that shield ultraviolet rays in both wavelength ranges of UV-A and UV-B are uniformly dispersed in a single particle, UV-A and UV-B It is possible to shield the ultraviolet rays in both wavelength ranges with a good balance, suppress the variation in the ultraviolet shielding ability, and improve the safety. In particular, it contains one or both of cerium oxide and zinc oxide as an ultraviolet shielding component in the UV-A wavelength region, titanium oxide as an ultraviolet shielding component in the UV-B wavelength region, and silicon oxide as a stable protective material component. When composite particles containing are used, an excellent feeling of use can be obtained together with a high ultraviolet shielding effect.

  Moreover, since the average particle diameter of the composite particles to be blended is 10 nm or more and 300 nm or less and the blending ratio in the cosmetic is 2 wt% or more and 15 wt% or less, while suppressing the squeaky feeling due to the frictional resistance of the composite particles, A sufficient ultraviolet shielding effect can be obtained.

  Further, if the surface of the composite particles is hydrophobized with a silicon compound or the like, in addition to the reduction of the surface activity due to silicon oxide, the surface activity of the composite particles is further suppressed, and organic cosmetics such as resins and oils are used. The affinity between the raw material and the composite particles, which are inorganic substances, is increased, and the dispersibility and stability of the composite particles in cosmetics are further improved.

  According to the present invention, there is provided an ultraviolet shielding cosmetic that has both excellent use feeling and a remarkable ultraviolet shielding effect, regardless of the cosmetic dosage form, such as powder foundation, skin cream, pressed powder, liquid foundation, lipstick and the like. Can be provided.

Claims (11)

  A cosmetic comprising blended composite particles in which a plurality of types of metal oxide components that shield at least UV-A and UV-B in both wavelength ranges are dispersed in a single particle.   The composite particle contains one or both of cerium oxide and zinc oxide as a metal oxide component excellent in UV-A wavelength band ultraviolet shielding ability, and is excellent in UV-B wavelength band ultraviolet shielding ability The cosmetic according to claim 1, comprising titanium oxide as an oxide component and silicon oxide as a stable protective material component.   The content of each metal oxide component in the composite particles is such that the total of cerium oxide and zinc oxide is 40 wt% to 90 wt%, titanium oxide is 5 wt% to 20 wt%, and silicon oxide is 5 wt%. The cosmetic according to claim 2, wherein the cosmetic is in the range of 40% by weight or less.   The cosmetic according to any one of claims 1 to 3, wherein the composite particles have an average particle diameter of 10 nm or more and 300 nm or less.   The cosmetic according to any one of claims 1 to 4, wherein a blending ratio of the composite particles is 2 wt% or more and 15 wt% or less.   The cosmetic according to any one of claims 1 to 5, wherein a surface of the composite particle is subjected to a hydrophobic treatment.   Furthermore, it is a powder foundation containing a colorant, talc, mica, titanium oxide, and an oil component, The cosmetic according to any one of claims 1 to 6.   The cosmetic according to any one of claims 1 to 6, further comprising a skin cream containing paraffin and an oil component.   The cosmetic according to any one of claims 1 to 6, wherein the cosmetic is a pressed powder containing a colorant, talc, resin powder, sericite, mica, and an oil component.   Furthermore, it is a liquid foundation containing a coloring agent, bentonite, and an oil component, Cosmetics of any one of Claim 1 thru | or 6 characterized by the above-mentioned.   The cosmetic according to any one of claims 1 to 6, wherein the cosmetic further comprises a lipstick containing a colorant, a wax, and an oil component.