JP4880078B1 - Powder cosmetics - Google Patents

Abstract

Disclosed is a powder cosmetic excellent in safety, usability, and UV protection effect.
SOLUTION: The following components (A) and (B) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A) Fine particle titanium oxide having a particle diameter of 5 to 100 nm and / or fine particle zinc oxide having a particle diameter of 5 to 400 nm was coated on a plate-like powder having a particle diameter of 1 to 50 μm in a weight ratio of 2: 8 to 7: 3. Plate-like composite powder having no glitter: 10 to 60% by weight,
(B) A spherical shape in which a fine particle of titanium oxide having a particle size of 5 to 100 nm and / or a fine particle of zinc oxide having a particle size of 5 to 400 nm is coated on a spherical powder having a particle size of 1 to 50 μm in a weight ratio of 2: 8 to 7: 3. Composite powder: 4-50% by weight
Containing powder cosmetics.
[Selection figure] None

Description

    The present invention relates to a powder cosmetic excellent in safety, usability, and UV protection effect.

  Powder cosmetics such as powder foundations and white powders are required as base makeup cosmetics to hide skin blots and dull skin problems, resulting in a natural and beautiful finish, but in recent years consumers against the harmful effects of ultraviolet rays In response to the growing awareness of, the effect of protecting the skin from ultraviolet rays is also required.

  However, since powder cosmetics generally have poor adhesion to skin compared to emulsified cosmetics and oily cosmetics, there is a problem that it is difficult to obtain a high UV protection effect. To the best of the inventors' knowledge, at least in the Japanese market, sunscreen creams labeled “SPF50 +” can be found, but powder cosmetics displaying “SPF50 +” are extremely rare, such as In fact, there is a problem with usability as cosmetics. (SPF (sun protection factor) represents the ratio between the minimum dose of erythema formation at the sample application portion and the minimum dose of erythema formation at the non-application portion, and “50+” indicates that this ratio is 51 or more. .)

  In the past, organic UV absorbers and inorganic fine particle powders such as titanium oxide and zinc oxide have been used in sunscreen cosmetics, but organic UV absorbers are safe for the skin and are used in systems that are used. There was a problem with the stability. The problem with inorganic fine particle powder is that although it is excellent in safety, it is difficult to stretch when applied to the skin due to its high cohesive force, and it does not conform well to the skin. There was a problem in usability as a cosmetic product, such as poor peeling.

  In order to solve the problem of usability of the inorganic fine particle powder, an attempt has been made to achieve both the ultraviolet shielding and good feeling by supporting the inorganic compound fine particles on the surface of the flaky substrate (Patent Documents 1 and 2). . In addition, use of a spherical resin powder whose surface is covered with an inorganic powder having a particle diameter of 0.01 to 5 μm for makeup cosmetics is known (Patent Document 3). However, even if each of these composite powders is blended in a powder cosmetic, it is still difficult to obtain a high UV protection effect due to poor adhesion.

  In addition, it is not known that a plate-like composite powder coated with a fine particle inorganic powder and a spherical composite powder coated with a fine particle inorganic powder are mixed in accordance with a powder cosmetic. It has not been known at all that a remarkably high ultraviolet protection effect can be obtained synergistically by using the powder and spherical composite powder together in a powder cosmetic.

JP-A-9-132514 JP 62-187770 A JP 61-194010 A

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique for improving safety, usability, and UV protection effect in powder cosmetics.

  In view of such a situation, the present inventors have made extensive research efforts to provide a technology for improving safety, usability and UV protection effect in powder cosmetics. By compounding together a plate-like composite powder coated with powder and a spherical composite powder coated with the same fine inorganic particle powder, it is extremely excellent in UV protection, safety and usability. The present inventors have found that a powder cosmetic can be obtained and have completed the present invention. That is, the present invention provides the following powder cosmetics.

The following components (A) and (B) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A) Fine particle titanium oxide having a particle diameter of 5 to 100 nm and / or fine particle zinc oxide having a particle diameter of 5 to 400 nm to a plate-like powder having a particle diameter of 1 to 50 μm , the fine particle titanium oxide and / or the fine particle zinc oxide: One or two or more kinds of plate-like composite powders coated with a weight ratio of the plate- like powders of 2: 8 to 7: 3 and having no glitter: 10 to 60% by weight, and (B) Fine particle titanium oxide and / or fine particle zinc oxide having a particle diameter of 5 to 100 nm and / or fine particle zinc oxide having a particle diameter of 5 to 400 nm and spherical powder having a particle diameter of 1 to 50 μm are used. ratio of 2: 8-7: 1 or more kinds of the spherical composite powder coated with 3 weight ratio: 4-50 wt%
A powder cosmetic comprising:

The powder cosmetic of the present invention preferably satisfies the above composition and also satisfies the following composition.
The following components (A1), (A2), (B1) and (B2) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A1) relative to the plate-like powder having a particle diameter particle size of fine particles of titanium oxide of 5 to 100 nm 1 to 50 [mu] m, fine particles of titanium oxide: said plate ratio of the powder 2: 8-7: 3 weight ratio Covered plate-like composite powder having no glitter: 3 to 40% by weight,
(A2) The fine zinc oxide particles having a particle diameter of 5 to 400 nm and the plate powder having a particle diameter of 1 to 50 μm are in a weight ratio of 2: 8 to 7: 3. Covered plate-like composite powder having no glitter: 3 to 40% by weight,
(B1) Fine particle titanium oxide having a particle size of 5 to 100 nm was coated on a spherical powder having a particle size of 1 to 50 μm at a weight ratio of the fine particle titanium oxide: the spherical powder of 2: 8 to 7: 3. Spherical composite powder: 2 to 30% by weight, and (B2) fine zinc oxide having a particle size of 5 to 400 nm and spherical powder having a particle size of 1 to 50 μm, the ratio of the fine particle zinc oxide to the spherical powder is 2. : Spherical composite powder coated at a weight ratio of 8 to 7: 3: 2 to 30% by weight
Containing powder cosmetics.

  ADVANTAGE OF THE INVENTION According to this invention, it can provide the powder cosmetics which have the high ultraviolet-ray protective effect and were excellent in safety | security and usability.

1. Plate-shaped composite powder (A)
In the plate-like powder serving as the substrate of the plate-like composite powder that is the component (A) of the powder cosmetic of the present invention, “plate-like” refers to the aspect ratio of the powder particles (long diameter and thickness of the powder) Ratio) is 5 or more. If it is a plate-like powder, there is no particular limitation, and specific examples thereof include mica, sericite, talc, synthetic mica, plate-like silica, plate-like titania, plate-like alumina, plate-like barium sulfate, boron nitride, A plate-like powder such as a plate-like glass powder may be mentioned. Mica and sericite are particularly preferable in terms of spreadability (spreading on the skin), adhesion (attachment to the skin), and moderate gloss. These may be used alone or in combination of two or more.

  The particle size of the plate-like powder is 1 to 50 μm. If it exceeds 50 μm, it is not preferable because it feels rough and has a lustrous gloss. A particularly preferable particle size is 3 to 30 μm.

  The particle diameter of the fine particle titanium oxide used for the preparation of the plate-like composite powder (A) is 5 to 100 nm. Even if the particle size is larger or smaller than this range, the ultraviolet absorption efficiency decreases, so the particle size is controlled within this range. A preferable particle diameter is 10 to 50 nm.

  The particle diameter of the fine particle zinc oxide used for the plate-like composite powder (A) is 5 to 400 nm. Even if the particle size is larger or smaller than this range, the ultraviolet absorption efficiency decreases, so the particle size is controlled within this range. A preferred particle size is 10 to 300 nm.

The coating amount of fine particle titanium oxide and / or fine particle zinc oxide is such that the ratio of fine particle titanium oxide and / or fine particle zinc oxide: plate-like powder to the plate-like powder is 2: 8 to 7: 3 by weight. . When the ratio of fine particle titanium oxide and / or fine particle zinc oxide is smaller than 2: 8, a high ultraviolet shielding effect cannot be obtained, and when larger than 7: 3, when applied to the skin, a squeaky feeling derived from fine particle powder is felt, Elongation worsens. The preferred weight ratio is such that the weight ratio of fine particle titanium oxide: plate-like powder is 2: 8 to 6: 4 in the case of fine particle titanium oxide-coated plate-like composite powder, and the fine particle amount in fine particle zinc oxide-coated plate-like composite powder The weight ratio of zinc oxide: plate-like powder is from 3: 7 to 7: 3.

  As the plate-like composite powder (A) used in the powder cosmetic of the present invention, those having no glitter are used. That is, when the coating with fine particle titanium oxide and / or fine particle zinc oxide becomes a dense film as seen in pearlescent pigments, it has a brilliant finish, and also has an ultraviolet protection effect. Since it decreases, it is not preferable as a UV protection cosmetic.

2. Production of plate-like composite powder (A) To produce plate-like composite powder (A), a method of forming a composite by coating fine plate titanium oxide and / or fine particle zinc oxide on plate-like powder is performed. It is done. As this method, any known method of a wet method and a dry method can be used.

2-1. Manufacture by a wet method The following method is mentioned as a wet method.
(1) A plate-like powder is suspended in an aqueous solution of a titanium salt or a zinc salt, and the titanium or zinc hydroxide is hydrolyzed to form titanium or zinc hydroxide or oxide particles on the surface of the plate-like powder. And then filtered, washed with water, dried or fired. When coating plate-like powder with titanium oxide particles, for example, a method as described in Patent Document 2 can be used. As described above, when a coating with titanium oxide and / or zinc oxide becomes a dense film as seen in pearlescent pigments, it should be avoided to use since it exhibits glitter.

(2) Plate-like powder and fine-particle titanium oxide or fine-particle zinc oxide are dispersed in a dispersion medium composed of an organic solvent and / or water, and the plate-like powder is utilized by utilizing electrostatic interaction between the fine-particle powder and the plate-like powder. The body surface can be coated with fine particle powder (Japanese Patent Laid-Open Nos. 9-132514 and 2003-212721).
(3) A method of coating a plate-like powder with fine particle powder in the presence of supercritical carbon dioxide (Japanese Patent Application Laid-Open No. 2004-238337) can also be employed.

2-2. Production by dry method As the dry method, a mechanochemical method (for example, JP-A-5-214257) can be employed.

  Commercially available fine particle powder can be used except when the fine particle powder is precipitated by hydrolysis of titanium or zinc salt. Examples of commercially available fine particle titanium oxide include MT-100SA, MT-05, MT-500B, MT-500H, MT-500HSA (manufactured by Teika Co., Ltd.), TTO-51 (A), TTO-55 (A), and TTO-. 55 (B), TTO-F1, TTO-S1 (manufactured by Ishihara Sangyo Co., Ltd.) and the like can be suitably used. Examples of commercially available fine particle zinc oxide include MZ-300, MZ-500, MZ-700 (manufactured by Teika Co., Ltd.), fine zinc white, FINEX-25, FINEX-50, FINEX-75 (manufactured by Sakai Chemical Industry Co., Ltd.), etc. Can be suitably used.

  The plate-like composite powder (A) is preferably subjected to a surface hydrophobization treatment that is generally known for cosmetic powders. Examples of such surface hydrophobing treatment include baking treatment with silicone such as methyl hydrogen polysiloxane and (dimethicone / methicone) copolymer, fatty acid treatment such as stearic acid, and fatty acid metal soap treatment such as aluminum stearate and zinc stearate. , Acylated amino acid (salt) treatment, lipoamino acid treatment that is a mixed treatment of acylated amino acid (salt) and fatty acid (salt), fluorine treatment such as perfluoroalkyl phosphate, silylation treatment, isostearyl sebacate, etc. Known surface treatments such as acidic ester treatment can be used. Of these, fatty acid metal soap treatment and silicone treatment are particularly preferred from the viewpoints of usability and makeup sustainability.

  The hydrophobized surface treatment may be applied to the fine particle powder and / or the plate-like powder before compounding in advance. A sufficient makeup sustaining effect can be obtained by making the fine particle powder covering the surface hydrophobic.

  Commercially available products can also be used as the fine particle powder subjected to the hydrophobic surface treatment. Examples of such fine particle titanium oxide include MT-100TV (treated with aluminum stearate), MT-01 (treated with aluminum stearate), MT-500T (treated with aluminum stearate), MT-500SAS (treated with dimethicone / methicone copolymer) ( (Taika Co., Ltd.) etc. can be suitably used. As the fine particle zinc oxide subjected to the hydrophobic surface treatment, MZ-303S (methicone treatment), MZ-303M (dimethicone treatment), MZ-503S (methicone treatment), MZ-503M (dimethicone treatment) (manufactured by Teika Co., Ltd.) Etc.) can be suitably used.

3. Characteristics of the plate-like composite powder (A) In the plate-like composite powder (A), the fine particle powder needs to adhere to the plate-like powder sufficiently firmly. If the adhesion is insufficient, when it is applied to the skin in cosmetic preparations or when the cosmetic is applied to the skin, it behaves as a fine particle powder, resulting in increased frictional resistance during application, poor elongation, and reduced usability. Therefore, the plate-like composite powder (A) preferably has an average friction coefficient (MIU value) of 0.6 or less. More preferably, the MIU value is 0.5 or less for the fine particle titanium oxide-coated plate-like composite powder, and 0.4 or less for the fine particle zinc oxide-coated plate-like composite powder.

The average friction coefficient is measured using Kato Tech Co., Ltd. friction tester-KES-SE, and the powder to be measured is 0.5 mg / cm ² on artificial leather (PBZ13001 made by Idemitsu Techno Fine Co., Ltd.). It can be uniformly applied and obtained under the condition of a load of 50 g.

The fine particle titanium oxide-coated plate-like composite powder that is one of the plate-like composite powders (A) preferably has an in vitro SPF of 4 or more when applied to a sample application plate at 0.8 mg / cm ^2. . In addition, the fine zinc oxide-coated plate-like composite powder which is another one of the plate-like composite powder (A) preferably has an in vitro SPF of 2 or more measured under the same conditions as described above.

  In vitro SPF can be measured, for example, using SPF Analyzer UV-1000S manufactured by Labshere. However, PA-1 manufactured by Shiseido Medical Rika Technology Co., Ltd. is used as the sample application plate. The sample application plate PA-1 is a plate having a pseudo skin groove similar to a human skin shape, and it is said that a value close to in vivo SPF measurement is obtained (Non-Patent Document Ishikubo et al., J. Soc Cosmet.Chem.Japan Vol.37, No.1 10-15 (2003) "Development of a new in vitro UV protection evaluation method"). A predetermined amount is evenly applied to the sample application plate with a finger, measured 10 times, and an average SPF value is obtained.

  The compounding amount (A) of the plate-like composite powder is 10 to 60% by weight based on the whole powder cosmetic. If it is less than 10% by weight, a sufficient UV protection effect cannot be obtained. A more preferable blending amount is 15 to 45% by weight.

4). Spherical composite powder (B)
In the spherical powder that is the substrate of the spherical composite powder that is the component (B) of the powder cosmetic of the present invention, “spherical” means that the powder particles are spherical and may be substantially spherical. However, those close to true spheres are preferable from the viewpoint of usability. If it is spherical powder, there is no restriction | limiting in particular, An inorganic particle and an organic particle are used. Specific examples of the inorganic spherical powder include anhydrous silicic acid, calcium carbonate, calcium silicate and the like. Specific examples of the organic spherical powder include nylon, polyethylene, polypropylene, polyester, polystyrene, polyurethane, styrene-acrylic copolymer, polymethyl methacrylate, cellulose, polyolefin, polytetrafluoroethylene, and silicone powder. Of these, organic spherical powders are preferable from the viewpoint of usability and feel, and among these, nylon, cross-linked polymethyl methacrylate, polymethylsilsesquioxane, polyurethane, and silicone elastomer powder are particularly preferable. These may be used alone or in combination of two or more.

  The particle diameter of the spherical powder used for the spherical composite powder (B) is 1 to 50 μm. If it is less than 1 μm, the elongation is poor, which is not preferable. When it exceeds 50 μm, it is not preferable because it feels rough and adhesion decreases. A preferable particle diameter is 3 to 30 μm.

  The particle diameter of the fine particle titanium oxide used for the spherical composite powder (B) is 5 to 100 nm. Even if the particle diameter of the fine particle titanium oxide is larger or smaller than this range, the ultraviolet absorption efficiency decreases, so the particle diameter is controlled within this range. A preferable particle diameter is 10 to 50 nm.

  The particle diameter of the fine particle zinc oxide used for the spherical composite powder (B) is 5 to 400 nm. Even if the particle diameter of the fine zinc oxide is larger or smaller than this range, the ultraviolet absorption efficiency decreases, so the particle diameter is controlled within this range. A preferred particle size is 10 to 300 nm.

  Commercially available fine particle powder can be used except when the fine particle powder is precipitated by hydrolysis of titanium or zinc salt. Examples of commercially available fine particle titanium oxide include MT-100SA, MT-05, MT-500B, MT-500H, MT-500HSA (manufactured by Teika Co., Ltd.), TTO-51 (A), TTO-55 (A), and TTO-. 55 (B), TTO-F1, TTO-S1 (manufactured by Ishihara Sangyo Co., Ltd.) and the like can be suitably used. Examples of commercially available fine particle zinc oxide include MZ-300, MZ-500, MZ-700 (manufactured by Teika Co., Ltd.), fine zinc white, FINEX-25, FINEX-50, FINEX-75 (manufactured by Sakai Chemical Industry Co., Ltd.), etc. Can be suitably used.

The coating amount of fine particle titanium oxide and / or fine particle zinc oxide is such that the weight ratio of fine particle titanium oxide and / or fine particle zinc oxide: spherical powder is 2: 8 to 7: 3 with respect to the spherical powder. When the weight ratio of fine particle titanium oxide and / or fine particle zinc oxide is smaller than 2: 8, a high ultraviolet shielding effect cannot be obtained, and when larger than 7: 3, a squeaky feeling derived from fine particle powder is felt when applied to the skin. , The elongation becomes worse. A preferred weight ratio is such that the weight ratio of fine particle titanium oxide and / or fine particle zinc oxide: spherical powder is 3: 7 to 6: 4.

5. Production of Spherical Composite Powder (B) In order to produce the spherical composite powder (B), a method is adopted in which a spherical powder is coated with fine particle titanium oxide and / or fine particle zinc oxide to form a composite. As this method, any known method of a wet method and a dry method can be used. Examples of the wet method and the dry method include the same methods as described in 2-1 and 2-2. Among these, the mechanochemical dry compounding method is preferable from the viewpoints of usability and UV protection effect.

  As a method of dry compounding by mechanochemical, various ball mills, pot mills, mortars, grinders, attritors and the like shown in Patent Document 3 can be used, and a high-speed jet airflow crusher, a hybridizer, A well-known compounding device such as mechanofusion can also be used.

  The spherical composite powder (B) is preferably subjected to a surface hydrophobization treatment that is generally known for cosmetic powders. Examples of such surface treatment include baking treatment with silicone such as methyl hydrogen polysiloxane and (dimethicone / methicone) copolymer, fatty acid treatment such as stearic acid, fatty acid metal soap treatment such as aluminum stearate and zinc stearate, acyl Amino acid treatment, lipoamino acid treatment that is a mixed treatment of acylated amino acid (salt) and fatty acid (salt), fluorine treatment such as perfluoroalkyl phosphate, silylation treatment, acidic ester treatment such as isostearyl sebacate, etc. Surface treatment can be used. Of these, fatty acid metal soap treatment and silicone treatment are particularly preferred from the viewpoints of usability and makeup sustainability.

  The hydrophobized surface treatment may be applied to the fine particle powder and / or the spherical powder in advance before being combined. A sufficient makeup sustaining effect can be obtained by making the fine particle powder covering the surface hydrophobic.

  Commercially available products can also be used as the fine particle powder subjected to the hydrophobic surface treatment. Examples of such fine particle titanium oxide include MT-100TV (treated with aluminum stearate), MT-01 (treated with aluminum stearate), MT-500T (treated with aluminum stearate), MT-500SAS (treated with dimethicone / methicone copolymer) ( (Taika Co., Ltd.) etc. can be suitably used. As the fine particle zinc oxide subjected to the hydrophobic surface treatment, MZ-303S (methicone treatment), MZ-303M (dimethicone treatment), MZ-503S (methicone treatment), MZ-503M (dimethicone treatment) (manufactured by Teika Co., Ltd.) Etc.) can be suitably used.

6). Characteristics of the spherical composite powder (B) In the spherical composite powder (B), the fine particle powder needs to adhere to the spherical powder sufficiently firmly. If the adhesion is insufficient, when it is applied to the skin in cosmetic preparations or when the cosmetic is applied to the skin, it behaves as a fine particle powder, resulting in increased frictional resistance during application, poor elongation, and reduced usability. Therefore, the spherical composite powder (B) preferably has an average friction coefficient (MIU value) of 0.3 or less. More preferably, the MIU value is 0.28 or less. The method for measuring the average friction coefficient is as described for the plate-like composite powder (A).

The fine titanium oxide-coated spherical composite powder that is one of the spherical composite powders (B) preferably has an in vitro SPF of 4 or more when applied to a sample coating plate at 0.8 mg / cm ² . The fine zinc oxide-coated spherical composite powder which is another spherical composite powder (B) preferably has an in vitro SPF of 3 or more measured under the same conditions as described above. The measuring method of in vitro SPF is as described for the plate-like composite powder (A).

  The blending amount (B) of the spherical composite powder is 4 to 50% by weight with respect to the whole powder cosmetic. If the amount is less than 4% by weight, a sufficient UV protection effect cannot be obtained. A more preferable blending amount is 8 to 40% by weight.

7). Composition of powder cosmetic In the powder cosmetic of the present invention, the compounding amounts of the plate-like composite powder (A) and the spherical composite powder (B) are 10 to 10 based on the weight of the powder cosmetic, respectively. 60% by weight and 4-50% by weight.
The mixing ratio of the plate-like composite powder (A) a spherical composite powder (B) has a weight ratio [(A) :( B)] in 9: 1 to 3: is preferably 7.

With a powder cosmetic comprising only the plate-like composite powder (A) or only the spherical composite powder (B), it is difficult to uniformly cover the skin surface with an uneven structure, and a high UV protection effect cannot be obtained. . That is, the plate-like composite powder tends to adhere mainly to the skin ridges, and the presence of fine particle powder in the skin groove is small, whereas the spherical composite powder is mainly skin depressions. This is because it easily adheres to the skin groove. A more preferable mixing ratio of the plate-like composite powder (A) and the spherical composite powder (B) is 8: 2 to 4: 6 in a weight ratio [(A) :( B)] .

  In the powder cosmetic of the present invention, in order to obtain a higher SPF value and PA (Protection Grade of UVA) value, it is preferable that the powder cosmetic satisfy the above composition and the following composition. .

The following components (A1), (A2), (B1) and (B2) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A1) relative to the plate-like powder having a particle diameter particle size of fine particles of titanium oxide of 5 to 100 nm 1 to 50 [mu] m, fine particles of titanium oxide: said plate ratio of the powder 2: 8-7: 3 weight ratio Coated plate-like composite powder having no glitter: 3 to 40% by weight, preferably 7 to 40% by weight,
(A2) The fine zinc oxide particles having a particle diameter of 5 to 400 nm and the plate powder having a particle diameter of 1 to 50 μm are in a weight ratio of 2: 8 to 7: 3. Coated plate-like composite powder having no glitter: 3 to 40% by weight, preferably 7 to 40% by weight,
(B1) Fine particle titanium oxide having a particle size of 5 to 100 nm was coated on a spherical powder having a particle size of 1 to 50 μm at a weight ratio of the fine particle titanium oxide: the spherical powder of 2: 8 to 7: 3. spherical composite powder: 2-30 wt%, preferably 5 to 30 wt%, and (B2) a zinc oxide fine particles having a particle diameter 5~400nm to spherical powder of particle size 1 to 50 [mu] m, the particulate zinc oxide: Spherical composite powder coated with a spherical powder ratio of 2: 8 to 7: 3: 2 to 30% by weight, preferably 3 to 30% by weight,
Containing powder cosmetics.

8). Other components of powder cosmetic In the powder cosmetic of the present invention, it is preferable to use a powder component other than the composite powders (A1), (A2), (B1), and (B2). Examples of components used in combination include various inorganic powders and organic powders.
Inorganic powders that can be used in combination include titanium oxide, zinc oxide, bengara, yellow iron oxide, black iron oxide, ultramarine, bitumen, cerium oxide, talc, muscovite, synthetic mica, phlogopite, biotite, synthetic fluorine. Phlogopite, titanium mica, mica-like iron oxide, sericite, zeolite, kaolin, bentonite, clay, silicic acid, anhydrous silicic acid, magnesium silicate, magnesium aluminum silicate, calcium silicate, barium sulfate, magnesium sulfate, calcium sulfate , Calcium carbonate, magnesium carbonate, boron nitride, bismuth oxychloride, alumina, zirconium oxide, magnesium oxide, chromium oxide, calamine, hydroxyapatite, boron nitride, and composites thereof. Among these, boron nitride, sericite, and synthetic fluorine phlogopite are preferable because of their excellent usability. These inorganic powders are preferably subjected to a surface hydrophobization treatment from the viewpoints of usability and makeup sustainability. Examples of such surface treatment include baking treatment with silicone such as methyl hydrogen polysiloxane and (dimethicone / methicone) copolymer, fatty acid treatment such as stearic acid, fatty acid metal soap treatment such as aluminum stearate and zinc stearate, acyl Amino acid treatment, lipoamino acid treatment that is a mixed treatment of acylated amino acid (salt) and fatty acid (salt), fluorine treatment such as perfluoroalkyl phosphate, silylation treatment, acidic ester treatment such as isostearyl sebacate, etc. Surface treatment can be used. In particular, acidic ester treatment, amino acid treatment, and lipoamino acid treatment are particularly preferred from the viewpoints of usability and makeup sustainability. In addition, isostearyl sebacate-treated sericite as an extender is used in combination with 5 to 50% by weight based on the weight of the powder cosmetic, the plate-like composite powder (A) and the spherical composite powder (B). Particularly preferred from the viewpoint of usability and adhesion.

  Similarly, organic powders that can be used in combination include silicone powder, silicone elastic powder, polyurethane powder, cellulose powder, nylon powder, silk powder, PMMA powder, starch, polyethylene powder, polystyrene powder, carbon black, tar pigment, and natural pigment. Metal soaps such as zinc stearate, and composites thereof. Elastomer powders such as silicone elastic powder and polyurethane powder can be suitably used from the viewpoint of usability, and the blending amount is preferably 1 to 10% by weight based on the weight of the powder cosmetic.

  The powdery cosmetic composition of the present invention can be blended with oily components that are usually used in cosmetics. Such oil components include, for example, macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hardened coconut oil, hardened Oil, molasses, hydrogenated castor oil, beeswax, candelilla wax, carnauba wax, botarou, lanolin, reduced lanolin, hard lanolin, jojoba oil, waxes, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum, micro Hydrocarbons such as crystallin wax, oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, higher fatty acids such as stearic acid, behenic acid, undecylenic acid, cetyl alcohol, stearyl alcohol, isostearyl High alcohols such as alcohol, behenyl alcohol, octyldodecanol, myristyl alcohol, cetostearyl alcohol, cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, malic acid Diisostearyl, di-2-ethylhexanoic acid ethylene glycol, dicaprate neopentyl glycol, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexanoic acid glycerin, tri-2-ethylhexanoic acid trimethylolpropane, tri Synthetic ester oils such as trimethylolpropane isostearate and pentane erythritol tetra-2-ethylhexanoate, dimethylpolysiloxane, methylphenylpolysiloxane Chain polysiloxanes such as xane and diphenylpolysiloxane, cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, Examples thereof include oil agents such as silicone oil such as modified polysiloxane such as fluorine-modified polysiloxane.

  In addition to the oil component, it is preferable to add a surfactant from the viewpoint of usability such as familiarity with the skin and removal to a puff. Examples of such surfactants include fatty acid soaps such as sodium laurate and sodium palmitate; anionic surfactants such as potassium lauryl sulfate and alkylethanol triethanolamine ether; stearyltrimethylammonium chloride, benzalkonium chloride and lauryl. Cationic surfactants such as amine oxides; imidazoline-based amphoteric surfactants (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine-based surfactants (alkylbetaines, amides) Amphoteric surfactants such as betaine, sulfobetaine, etc .; sorbitan fatty acid esters (such as sorbitan monostearate, sorbitan sesquioleate), glycerin fatty acids (glyceryl monostearate) Propylene glycol fatty acid esters (such as propylene glycol monostearate), hydrogenated castor oil derivatives, glycerin alkyl ether, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbit Fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2) -Octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonyl phenyl ether, etc.), Pluronic types, POE / POP alkyl ether Nonionic surface actives such as POE / POP2-decyltetradecyl ether, Tetronics, POE castor oil / hardened castor oil derivatives (POE castor oil, POE hardened castor oil, etc.), sucrose fatty acid esters, alkyl glucosides, etc. Examples include agents. Among them, a preferable surfactant is a lipophilic nonionic surfactant having an HLB of 7 or less, and the blending amount is preferably 0.1 to 3% by weight based on the weight of the powder cosmetic.

  The powder cosmetic of the present invention can be blended with other optional components that are usually used in cosmetics within a range that does not impair the effects of the present invention. Examples of such optional components include polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2 , 4-hexylene glycol, polyhydric alcohols such as 1,2-hexanediol, 1,2-octanediol, hyaluronic acid, sodium hyaluronate, sodium pyrrolidone carboxylate, lactic acid, sodium lactate and other moisturizing ingredients, Lower alcohols such as ethanol and isopropanol, vitamin A or derivatives thereof, vitamin B6 hydrochloride, vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or derivatives thereof, vitamin B 2, Vitamin B such as vitamin B15 or its derivatives, α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E such as vitamin E acetate, vitamin D, vitamin H, pantothenic acid, panthetin, pyrroloquinoline quinone, etc. Of these, vitamins can be preferably exemplified.

  Paraaminobenzoic acid UV absorbers, anthranilic acid UV absorbers, salicylic acid UV absorbers, cinnamic acid UV absorbers, benzophenone UV absorbers, sugar UV absorbers, 2- (2'-hydroxy-5 ' Higher SPF and PA values can be obtained by blending organic ultraviolet absorbers such as -t-octylphenyl) benzotriazole and 4-methoxy-4'-t-butyldibenzoylmethane, but safety is emphasized When it does, it is preferable not to contain these organic ultraviolet absorbers.

  The powder cosmetic of the present invention can be applied to powder cosmetics for various purposes by appropriately changing the composition of the above raw materials. As the types of the cosmetics of the present invention, any powder cosmetics can be applied without particular limitation as long as the application of the powder cosmetics is already known. For example, foundations, foundation powders, finishing powders, teak colors, eye colors, UV protection cosmetics, water-use cakes, amphibious cakes, body powders and the like can be preferably exemplified.

  The form of the powder cosmetic may be either powder or solid. Among these, as a form in which the effect of the present invention is easily exhibited, a solid powder makeup cosmetic is exemplified.

  The powder cosmetic of the present invention can be prepared by uniformly mixing the powder component and, if necessary, other components according to a conventional method. It is also possible to fill this mixed powder into a container as it is and use it as loose powder. Furthermore, the mixed powder can be filled into a container and then pressed to obtain a solid powder. In the case of a solid powder, after adding one or more volatile solvents selected from water, lower alcohol, volatile silicone, light liquid isoparaffin, etc. to the mixed powder, pressing and drying can be used. This is preferable from the viewpoint of shape retention (hardness to crack).

  Hereinafter, the powder cosmetic of the present invention will be specifically described with reference to examples.

Preparation of plate-like composite powder (A) [Preparation Example 1]
As a plate-like powder, 65 parts by weight of sericite having an average particle diameter of 8 μm and 35 parts by weight of aluminum stearate-treated fine particle titanium oxide having an average particle diameter of 30 nm are subjected to a pulverizing and mixing process using a pulverizer, and a fine particle titanium oxide coated plate A composite powder (A1) was obtained.

[Preparation Example 2]
A plate-like powder was subjected to a pulverization mixing treatment using 47.5 parts by weight of sericite having an average particle diameter of 8 μm and 50 parts by weight of fine zinc oxide having an average particle diameter of 260 nm using a pulverizer. Suspend in 500 parts by weight, and slowly add a solution of 2.7 parts by weight of sodium stearate dissolved in 100 parts by weight of ion-exchanged water while stirring, filter, wash and dry. Hydrophobized fine particle zinc oxide-coated plate composite powder (A2) was obtained.

Preparation of spherical composite powder (B) [Preparation Example 3]
As a spherical powder, 50 parts by weight of a crosslinked polymethylmethacrylate powder having an average particle diameter of 7 μm and 50 parts by weight of a dimethicone-treated fine particle titanium oxide having an average particle diameter of 35 nm are subjected to a pulverizing and mixing process using a pulverizer. A composite powder (B1) was obtained.

[Preparation Example 4]
As a spherical powder, 50 parts by weight of a crosslinked polymethylmethacrylate powder having an average particle diameter of 7 μm and 50 parts by weight of a dimethicone-treated fine particle zinc oxide having an average particle diameter of 25 nm are subjected to a pulverizing and mixing process using a pulverizer to form a spherical zinc oxide coated A composite powder (B2) was obtained.

Measurement of in vitro SPF As a measuring device, SPF Analyzer UV-1000S manufactured by Labshere was used, and PA-1 manufactured by Shiseido Medical Rika Technology Co., Ltd. was used as a sample coating plate. The composite powders of Preparation Examples 1 to 4 and commercially available composite powders were each uniformly applied with a finger in an amount of 0.8 mg / cm ² . The measurement results are shown in Table 1.

Effect of mixing of plate-like composite powder (A) and spherical composite powder (B) The amount of application per area of titanium oxide or zinc oxide is adjusted, and composite powder (A) or ( B) The in vitro SPF was compared between the case where it was used alone and the case where the plate-like composite powder (A) and the spherical composite powder (B) were mixed. The plate-like composite powder (A) and the spherical composite powder (B) were mixed using a home mixer. The results are shown in Table 2.

  As is apparent from Table 2, when an in vitro SPF was measured using an application plate similar to human skin shape, the plate-like composite powder (A) and the spherical composite powder (B) were mixed. By using it, a significantly higher SPF value was obtained compared to the case of using it alone. When a 3M transpore surgical tape conventionally used as the coating plate was used, the effect of improving the SPF value was not seen even when the plate shape and the spherical shape were mixed.

Adhesion state of composite powder on application plate In order to consider the mechanism of the effect of improving SPF value by mixing plate-like composite powder (A) and spherical composite powder (B), application plate coated with mixed powder Is observed at a magnification of 300 times and 1000 times using a digital microscope manufactured by Keyence Corporation, spherical composite powder (B) is often seen in grooves imitating skin grooves, and plate-like composite powder (A) is peeled off. Many were seen in the flat part imitating a hill. Therefore, by mixing the plate-like composite powder (A) and the spherical composite powder (B), it can be uniformly attached to the human skin having a concavo-convex structure such as a skin groove and a skin hill without a gap. It was suggested.

Measurement of Average Friction Coefficient (MIU) Measurement of average friction coefficient (MIU) uses a friction tester-KES-SE manufactured by Kato Tech Co., Ltd. It was uniformly spread on the artificial leather so as to be 0.5 mg / cm ² and obtained under the condition of a load of 50 g. The results are shown in Table 3.

（注３）家庭用ミキサで混合
（注４）日揮触媒化成社製カバーリーフＰＣ−２０３５（酸化チタン３０重量％）
（注５）日揮触媒化成社製ファンシーベール３３０ＴＷ（酸化亜鉛３０重量％）
表３の結果から本発明で用いられる複合粉体は単純混合粉体に比べ、ＭＩＵ値が低いことが示された。

(Note 3) Mixing with household mixer (Note 4) Cover leaf PC-2035 (30% by weight of titanium oxide) manufactured by JGC Catalysts & Chemicals
(Note 5) Fancy Veil 330TW (30% by weight of zinc oxide) manufactured by JGC Catalysts & Chemicals
From the results in Table 3, it was shown that the composite powder used in the present invention had a lower MIU value than the simple mixed powder.

<Examples 1-5><Comparative Examples 1-3>
The powder foundation of the formulation described in Table 4 was prepared by the following method, and each item of “Good elongation”, “Familiarity to skin”, “Good removal to puff”, “In vitro SPF” Was evaluated. The results are also shown in Table 1.

Evaluation method Evaluation method concerning “goodness of elongation”, “familiarity to skin”, and “good removal to puff”: Five female panels used each foundation and evaluated.
Each item was evaluated in three stages, “good (score: 2)”, “cannot say either (score: 1)”, and “bad (score: 0)”, and the average score was determined according to the following criteria.
[Judgment]: [Average score]
5: 1.8 or more 4: 1.5 or more and less than 1.8 3: 1.0 or more but less than 1.5 2: 0.3 or more but less than 1.0 1: less than 0.3

"In vitro SPF"
Using a SPF Analyzer UV-1000S manufactured by Labshere, PA-1 manufactured by Shiseido Medical Rika Technology Co., Ltd. was used as the sample coating plate, and the coating amount was 1.5 mg / cm ² .

注 ＊６ 日揮触媒化成社製カバーリーフＰＣ２０３５（酸化チタン３０重量％）
＊７ 日揮触媒化成社製ファンシーベル３３０ＴＷ（酸化亜鉛３０重量％）

* 6 Cover leaf PC2035 (30% by weight of titanium oxide) manufactured by JGC Catalysts & Chemicals
* 7 JGC Catalysts Chemical Fancy Bell 330TW (30% by weight of zinc oxide)

Production method A: Components 1 to 17 are mixed.
B: Add components 18-19 to the mixture of components 1-17 and mix.
C: A mixture of components 1 to 19 was filled in a metal pan and press-molded to obtain a powder foundation.

  As is apparent from the results of Table 4, the powder foundations of Examples 1 to 4 according to the present invention have “good elongation”, “familiarity to skin”, “good removal to puff”, “in vitro SPF”. It was excellent in all items. On the other hand, in Comparative Examples 1-3, what satisfy | filled all the items was not obtained. Moreover, the results of measuring the in vivo SPF of the powder foundation of Example 1 according to the standard test method of the Japan Cosmetic Industry Association were SPF45 and PA ++. It was confirmed that the powder cosmetic of the present invention can obtain high SPF in human skin.

<Example 6>: Powdered white powder (component) (% by weight)
1. Fine particle titanium oxide-coated plate-like composite powder (A1) 20.0 of Preparation Example 1
2. Fine zinc oxide-coated plate composite powder (A2) of Preparation Example 10.0
3. Fine particle titanium oxide-coated spherical composite powder (B1) of Preparation Example 8.0
4). Fine particle zinc oxide-coated spherical composite powder (B2) of Preparation Example 4 5.0
5. Urethane powder 5.0
6). Sericite treated with isostearyl sebacate 10.0
7). Titanium oxide 1.0
8). Bengala 0.1
9. Yellow iron oxide 0.2
10. Black iron oxide 0.05
11. Mica titanium 3.0
12 12. N-lauroylglutamic acid-treated talc balance 13 Octoxyglycerin 0.5

(Production method)
A: Components 1 to 11 are mixed.
B: Add component 13 to the mixture of components 1-11 and mix.
The powdered white powder of the present invention was excellent in usability such as familiarity with the skin, and the in vitro SPF with an application amount of 1.5 mg / cm ² was 28.

  Since the powder cosmetic of the present invention is excellent in safety, usability and UV protection effect, it is expected to be highly useful as a powder foundation or white powder.

Claims (2)

The following components (A) and (B) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A) Fine particle titanium oxide having a particle diameter of 5 to 100 nm and / or fine particle zinc oxide having a particle diameter of 5 to 400 nm to a plate-like powder having a particle diameter of 1 to 50 μm , the fine particle titanium oxide and / or the fine particle zinc oxide: One or two or more kinds of plate-like composite powders coated with a weight ratio of the plate- like powders of 2: 8 to 7: 3 and having no glitter: 10 to 60% by weight, and (B) Fine particle titanium oxide and / or fine particle zinc oxide having a particle diameter of 5 to 100 nm and / or fine particle zinc oxide having a particle diameter of 5 to 400 nm and spherical powder having a particle diameter of 1 to 50 μm are used. ratio of 2: 8-7: 1 or more kinds of the spherical composite powder coated with 3 weight ratio: 4-50 wt%
A powder cosmetic comprising: The following components (A1), (A2), (B1) and (B2) (weight% representing the amount of each component is based on the total weight of the powder cosmetic):
(A1) relative to the plate-like powder having a particle diameter particle size of fine particles of titanium oxide of 5 to 100 nm 1 to 50 [mu] m, fine particles of titanium oxide: said plate ratio of the powder 2: 8-7: 3 weight ratio Covered plate-like composite powder having no glitter: 3 to 40% by weight,
(A2) The fine zinc oxide particles having a particle diameter of 5 to 400 nm and the plate powder having a particle diameter of 1 to 50 μm are in a weight ratio of 2: 8 to 7: 3. Covered plate-like composite powder having no glitter: 3 to 40% by weight,
(B1) Fine particle titanium oxide having a particle size of 5 to 100 nm was coated on a spherical powder having a particle size of 1 to 50 μm at a weight ratio of the fine particle titanium oxide: the spherical powder of 2: 8 to 7: 3. Spherical composite powder: 2 to 30% by weight, and (B2) fine zinc oxide having a particle size of 5 to 400 nm and spherical powder having a particle size of 1 to 50 μm, the ratio of the fine particle zinc oxide to the spherical powder is 2. : Spherical composite powder coated at a weight ratio of 8 to 7: 3: 2 to 30% by weight
The powder cosmetic according to claim 1, comprising: