JP2019099411A - Keratin and hexagonal plate-like zinc oxide-containing granular complex - Google Patents

Abstract

To develop a material that can provide an external composition that achieves a high smooth feeling and a low rough feeling while reflecting near infrared radiation.SOLUTION: A granular complex contains keratin and a hexagonal plate-like zinc oxide particle.SELECTED DRAWING: None

Description

  The present invention relates to a particulate complex containing keratin and hexagonal plate-like zinc oxide.

  Sunlight is considered to be one of the causes of skin aging. Sunlight is composed of light of various wavelengths, and includes, for example, ultraviolet rays and near infrared rays as well as visible light. Because the energy of ultraviolet light is relatively large, methods have been developed to reduce the damage to the skin due to ultraviolet light. On the other hand, because the energy of the near infrared rays is relatively small, studies on damage to the skin have not been advanced so much. However, in recent years, it has become clear that ultraviolet rays are mainly absorbed by the skin surface layer and do not reach the deep part, while near infrared rays reach from the dermis to the muscular layer and affect the deep part. For this reason, in order to reduce the damage to the skin by sunlight, it is required to reflect near infrared rays.

  For this purpose, it has been studied to blend a substance having the ability to reflect near infrared rays in the composition for external use. Since the composition for external use is to be applied to the skin, it is also important to be able to obtain the smoothness of the skin (high slip feeling) and no roughness (low roughness) at the time of application. Therefore, there is a need for a composition for external use that achieves high smoothness and low roughness while reflecting near infrared rays.

International Publication No. 2012/147886 WO 2015/118777

  An object of the present invention is to develop a material capable of providing an external use composition in which high scanthiness and low roughness are achieved while reflecting near infrared light.

  Patent Document 1 describes a specific hexagonal plate-like zinc oxide, and also describes that the hexagonal plate-like zinc oxide can reflect infrared rays (including near infrared wavelength region) to some extent. The present inventors have found that a granular composite obtained by subjecting hexagonal plate-like zinc oxide to keratin treatment has an ability to reflect near-infrared rays that is almost equal to or higher than that of hexagonal plate-like zinc oxide itself, Since the body exhibits relatively low MIU (average coefficient of friction) and relatively low MMD (average deviation of coefficient of friction), the composition for external use containing the particulate composite may exhibit excellent smoothness and low roughness. The present invention has been completed after further investigations.

The present invention includes, for example, the subject matters described in the following sections.
Item 1.
A particulate complex comprising keratin and hexagonal plate-like zinc oxide particles.
Item 2.
The granular composite according to Item 1, wherein keratin is provided on the surface of hexagonal plate-like zinc oxide particles.
Item 3.
The particulate composite according to item 1 or 2, wherein the keratin is at least one selected from the group consisting of natural keratin, hydrolyzed keratin, cationized hydrolyzed keratin, and silylated hydrolyzed keratin.
Item 4.
The granular composite according to any one of Items 1 to 3, wherein the keratin content is 0.05 to 5% by mass.
Item 5.
The particulate composite according to any one of Items 1 to 4, wherein the primary particle size is 0.1 to 5 μm.
Item 6.
An external composition comprising the particulate composite according to any one of claims 1 to 5.
Item 7.
Item 7. The external composition according to item 6, which is a cosmetic composition, a quasi-drug composition, or a pharmaceutical composition.

  The granular complex containing the keratin and the hexagonal plate-like zinc oxide particles according to the present invention exhibits more excellent smoothness and low roughness as compared with the hexagonal plate-like zinc oxide particles themselves. Furthermore, a near infrared reflection effect approximately equivalent to or more than that of the hexagonal plate-like zinc oxide itself can also be exhibited. For this reason, it can be preferably used particularly for blending into a composition for external use.

The result of having measured the spectral reflectance is shown about the granular composite which contains a keratin and hexagonal plate-like zinc oxide particle, and hexagonal plate-like zinc oxide particle itself. The result of having measured the spectral reflectance is shown about the granular composite which contains a keratin and hexagonal plate-like zinc oxide particle, and hexagonal plate-like zinc oxide particle itself.

  Hereinafter, each embodiment of the present invention will be described in more detail.

  The particulate complex included in the present invention comprises keratin and hexagonal plate-like zinc oxide particles.

  The keratin is not particularly limited, and various known keratins used as cosmetic materials (for example, skin conditioning agents, hair conditioning agents, etc.) can be used. As such keratin, for example, natural keratin, hydrolyzed keratin, cationized hydrolyzed keratin, silylated hydrolyzed keratin and the like can be mentioned. As the hydrolyzed keratin, one obtained by hydrolyzing keratin protein with an acid, an alkali, an enzyme or the like can be mentioned. Also, cationized hydrolyzed keratin or silylated hydrolyzed keratin can be obtained by cationizing or silylation of hydrolyzed keratin with a modifier or by hydrolyzing cationized keratin protein or silylated keratin protein that has been previously modified. It can be prepared. Examples of the cationized hydrolyzed keratin include hydroxypropyltrimonium hydrolyzed keratin, stealdimonium hydroxypropyl hydrolyzed keratin, lauryldimonium hydroxypropyl hydrolyzed keratin and the like. In addition, examples of the silylated hydrolyzed keratin include (dihydroxymethylsilylpropoxy) hydroxypropyl hydrolyzed keratin and the like.

  The average molecular weight of keratin is not particularly limited, but, for example, about 100 to 50,000 is preferable. About 200 to 40,000 are more preferable. The keratin which is hydrolyzed and an average molecular weight becomes small is preferable, for example, about 300-5000 are preferable, about 400-3000 are more preferable, and about 500-2000 are more preferable. The average molecular weight is a number average molecular weight. Moreover, the number average molecular weight value is provided about the commercial item from each cosmetic material maker, and the number average molecular weight value of the said maker provision can be preferably used as an average molecular weight of the keratin in this invention.

  The raw material of keratin is not particularly limited, but various known keratins used as cosmetic materials are prepared, for example, from wool or feathers, and keratins prepared from wool or feathers can be preferably used in the present invention as well.

  Keratin can be used alone or in combination of two or more.

  The hexagonal plate-like zinc oxide particles preferably have a primary particle diameter of 0.1 to 10 μm, more preferably 0.1 to 5 μm, still more preferably 0.2 to 4 μm, and 0. Even more preferred is 5 to 3 μm. With such a primary particle diameter, it has high smoothness and low roughness, and is excellent due to the near infrared reflection effect.

  In addition, the primary particle diameter of hexagonal plate-like zinc oxide particles is a diagonal diameter (hexagonal plate in a field of 2000 to 50000 times of a photograph taken with a scanning electron microscope (SEM) (for example, JSM-6510A: manufactured by JEOL Ltd.) The length (μm) of one arbitrary one of the three diagonals of the flat surface (μm) is measured for 100 particles, and the value is obtained from 50% of the cumulative distribution.

  The hexagonal plate-like zinc oxide particles preferably have an aspect ratio of 2.5 or more. The aspect ratio is more preferably 2.7 or more, and still more preferably 3.0 or more. By having a plate shape having an aspect ratio of 2.5 or more, it is possible to have higher smoothness, lower roughness and higher near infrared reflection effect derived from the shape.

  The aspect ratio is a hexagonal plate-like surface in a field of 2000 to 50000 times that of a photograph of hexagonal plate-like zinc oxide particles taken with a scanning electron microscope (SEM) (for example, JSM-6510A: manufactured by JEOL Ltd.) For particles facing forward, the diameter of the diagonal (in the case of hexagonal plate-like zinc oxide particles, the length of any one of the three diagonals of the hexagonal plate-like surface) (μm) is divided by 100 particles The average of the measured values is L, and for particles in which the side faces of the hexagonal plate-like zinc oxide particles are facing forward (particles that appear to be rectangular), their thickness (μm) (length of shorter side of rectangle) is divided by 100 particles It is the value calculated | required as ratio (L / T) of those values, when the measured average value is set to T.

  The hexagonal plate-like zinc oxide particles are disclosed, for example, in WO 2012/147886, 2015/118777 and the like, and can be produced, for example, by the method described in the document. More specifically, it can be obtained, for example, by a production method including the step of aging particulate zinc oxide in an aqueous zinc salt solution. Hereinafter, the manufacturing method will be described in detail.

The fine particle zinc oxide is not particularly limited, but it is preferable to use raw material zinc oxide having a particle diameter of 0.005 μm or more and 0.2 μm or less. The particle size of the raw material zinc oxide corresponds to the diameter of a sphere having the same surface area as the specific surface area determined by the BET method. That is, the particle diameter is a value determined by the following formula from the specific surface area: Sg determined by BET method and the true specific gravity of zinc oxide: ρ. For measurement by the BET method, a fully automatic BET specific surface area measuring device (for example, Macsorb Model HM-1200 (manufactured by Mountech)) can be used.
Particle size (μm) = [6 / (Sg × ρ)]
(Sg (m ² / g): specific surface area, ρ (g / cm ³ ): true specific gravity of particles)
In addition, in the said calculation, 5.6 which is a value of true specific gravity of a zinc oxide was used for the true specific gravity of particle | grains (rho).
The raw material zinc oxide is not particularly limited, and zinc oxide produced by a known method can be used. Examples of commercially available products include FINEX-75, FINEX-50, FINEX-30, SF-15, fine zinc oxide and the like manufactured by Sakai Chemical Industry Co., Ltd.
Hexagonal plate-like zinc oxide particles can be obtained by maturing the above-mentioned fine particle zinc oxide in a zinc salt aqueous solution. That is, it can be obtained by dispersing the above-described particulate zinc oxide in a zinc salt aqueous solution and heating it in that state to grow crystals.

  The zinc salt in the zinc salt aqueous solution is not particularly limited, and examples thereof include zinc salt compounds such as zinc acetate, zinc nitrate, zinc sulfate, zinc chloride and zinc formate. Among the zinc salt aqueous solutions, the particular hexagonal plate-shaped zinc oxide particles of the present invention are suitably obtained particularly when a zinc acetate aqueous solution is used.

  Moreover, these zinc salt aqueous solutions may be prepared by mixing zinc oxide, an acid, and water, and acid-hydrolyzing zinc oxide. The particle shape and particle diameter of zinc oxide used when preparing a zinc salt aqueous solution with zinc oxide, acid and water are not particularly limited, but from the viewpoint of reducing impurities as much as possible, the zinc purity of zinc oxide is 95% or more Is preferred. Examples of the acid include acetic acid, nitric acid, sulfuric acid, hydrochloric acid, formic acid, citric acid, oxalic acid, propionic acid, malonic acid, lactic acid, tartaric acid, gluconic acid, succinic acid and the like. In particular, when using acetic acid, the specific hexagonal plate-like zinc oxide particles of the present invention can be obtained. Two or more of these aqueous zinc salt solutions may be used in combination.

  The zinc salt concentration in the zinc salt aqueous solution is preferably more than 0.1 mol / l and 4.0 mol / l or less, and in particular, when using a zinc acetate aqueous solution, the zinc acetate concentration in the aqueous solution is 0.2 mol It is preferably more than 1 / l and not more than 2.0 mol / l.

  The zinc salt aqueous solution may contain a small amount of components other than the zinc salt and water, as long as the effects of the present invention are not impaired. For example, a dispersing agent etc. can also be contained.

  When fine particle zinc oxide is added to a zinc salt aqueous solution to form a slurry, the concentration of the fine particle zinc oxide is preferably 10 to 500 g / l with respect to the total amount of the slurry.

In the above-mentioned ripening, fine particles of zinc oxide, zinc salts and components other than water may be added in small amounts, as long as the effects of the present invention are not impaired. For example, dispersants and the like can be added.
Aging is preferably performed at 45 to 110 ° C. Aging time can mention 0.5 to 24 hours. The particle diameter can be adjusted depending on conditions such as aging temperature, aging time, concentration of raw material zinc oxide, concentration of zinc salt, etc. Therefore, these conditions are appropriately set according to the target hexagonal plate-like zinc oxide particles. It is preferred to do.

The hexagonal plate-like zinc oxide particles thus obtained may be subjected to post treatments such as filtration, water washing, drying and the like, if necessary.
The hexagonal plate-like zinc oxide particles produced by the above method may be classified as required. As the said classification, classification by a sieve can be mentioned, for example. Examples of classification methods using a sieve include wet classification and dry classification. Further, processing such as wet grinding or dry grinding may be performed.

  Although the above-mentioned manufacturing method can obtain hexagonal plate-like zinc oxide particles without performing the firing treatment, the hexagonal plate-like zinc oxide particles obtained by the above-mentioned method may be subjected to the firing treatment . In the case of baking, the method of utilizing the well-known arbitrary apparatus can be mentioned, Processing conditions etc. are not specifically limited.

  A commercial item can also be used as hexagonal plate-like zinc oxide particles. For example, hexagonal plate-like zinc oxide XZ series (manufactured by Sakai Chemical Industry Co., Ltd.) can be preferably used, and among them, XZ-1000F, XZ-2000F, XZ-3000F and the like can be more preferably used. In addition, since the average particle diameter catalog value of the said commercial item is a measured value by a laser diffraction type particle size distribution apparatus, it differs from the average particle diameter value in this invention.

  The hexagonal plate-like zinc oxide particles can be used singly or in combination of two or more.

  The particulate composite according to the present invention preferably comprises keratin and zinc oxide particles in the form of keratin and zinc oxide particles. In particular, keratin is preferably present on the surface of a plate of hexagonal plate-like zinc oxide particles.

  As a method of providing keratin on the surface of hexagonal plate-like zinc oxide particles (in other words, a method of keratin treatment of the surface of hexagonal plate-like zinc oxide particles), for example, a slurry containing hexagonal plate-like zinc oxide particles and keratin is dried. The method which has a process is mentioned. More specifically, for example, a hexagonal plate-like zinc oxide and water are mixed to prepare a slurry, and while the slurry is stirred, a specific amount of keratin (for example, the amount of keratin added relative to the total amount of zinc oxide and keratin is 0) 0.5 to 10% by mass or 1 to 8% by mass), and aging for a specific time (for example, about 30 to 120 minutes), filtering and washing as necessary, and further drying (for example, 30 to 50) By conducting the reaction at 12 ° C. for about 12 to 24 hours, a granular composite having keratin on the surface of hexagonal plate-like zinc oxide particles can be prepared.

  The keratin content of the particulate complex according to the present invention is preferably 0.05 to 5% by mass, more preferably 0.8 to 4% by mass, and 0.1 to 3% by mass. Is more preferred. By including keratin in such a ratio, more excellent effects can be obtained in smoothness, roughness and infrared reflectivity. The keratin content of the particulate complex is a value determined as follows. That is, 2 g of each of the granular composite and the hexagonal plate-like zinc oxide particles as the raw material is put in a crucible, and heated in an electric furnace at 500 ° C. for 1 hour, and the weight after heating is measured. Then, all keratins contained in the particulate complex have disappeared, and the keratin content rate (mass) in the particulate complex is assumed to be the same regardless of the rate of reduction of the hexagonal zinc oxide particles as the raw material. Calculate%).

  In addition, it is preferable that the granular complex which concerns on this invention equips the surface with keratin. Moreover, the said granular composite may consist only of hexagonal plate-like zinc oxide particle and keratin, and may contain components other than these in the range which does not impair the effect of this invention. However, it is preferable that keratin is present on part or all of the surface of the complex. Moreover, it is preferable that the said granular composite body itself is a hexagonal plate-like shape. Further, for example, it is preferable that hexagonal plate-like zinc oxide particles and keratin form a laminate. Further, it is preferable that keratin is treated and immobilized on the surface of a plate of hexagonal plate-like zinc oxide particles. Although not wanting a limited interpretation, it is considered that when the composite itself is in the form of a hexagonal plate, when the composite is spread in a plane, it becomes possible to spread the surface without a large gap. Furthermore, it is considered that a keratin-treated surface is formed on the surface of the spread surface by laying the surface of the complex on which the keratin has been treated to be a surface, which is preferable.

  In addition, when components other than hexagonal plate-shaped zinc oxide particles and keratin are contained in the said granular composite, it is preferable to exist between hexagonal plate-shaped zinc oxide particles and keratin. For example, when a hexagonal plate-like zinc oxide particle surface-treated with another component is subjected to keratin treatment to prepare the granular composite, another component (a hexagonal plate-like zinc oxide in advance is prepared between the hexagonal plate-like zinc oxide particle and keratin The components used for surface treatment that have been applied to the particle surface will be present.

  In addition, in the present specification, a particulate complex having keratin on the surface of hexagonal plate-like zinc oxide particles is a concept including also a particulate complex in which other components are contained between hexagonal plate-like zinc oxide particles and keratin. . In other words, if the granular composite having keratin on the surface of hexagonal plate-like zinc oxide particles has keratin on the surface of the granular composite, keratin may be provided in contact with the surface of hexagonal plate-like zinc oxide particles Other components may be provided between the keratin and the surface of the hexagonal plate-like zinc oxide particles.

  The surface treatment which may be applied to the surface of the hexagonal plate-like zinc oxide particles in advance is not particularly limited. For example, silicon oxide, hydrate of silicon oxide, oxide of aluminum and hydroxide of aluminum Surface treatment with at least one compound selected from the group consisting of: surface treatment with a water repellent organic compound; surface treatment with a coupling agent such as a silane coupling agent or a titanium coupling agent; it can. These two or more surface treatments may be performed in combination.

The formation of a film by at least one compound selected from the group consisting of the above silicon oxides, hydrates of silicon oxides, oxides of aluminum and hydroxides of aluminum is a Si source compound and / or an Al source compound. Can be deposited on the surface of the powder by hydrolysis, thermal decomposition or the like. As the Si source compound and / or the Al source compound, tetraalkoxysilane or its hydrolytic condensate, sodium silicate, potassium silicate, aluminum alkoxide or its hydrolytic condensate, sodium aluminate etc., SiO ₂ or the like easily A compound etc. which convert to Al (OH) ₃ and Al ₂ O ₃ can be used.

  The hydrolysis is not particularly limited, and examples thereof include a method using an acid such as sulfuric acid, hydrochloric acid, acetic acid or nitric acid. In the method of treating silica using this aqueous dispersion, the method of adding an acid to a dispersion containing hexagonal plate-like zinc oxide particles, and then adding a Si source compound and / or an Al source compound, a dispersion The method may be any of a method of adding an Si source compound and / or an Al source compound and then adding an acid, and a method of simultaneously adding a Si source compound and / or an Al source compound and an acid to the dispersion.

  The treatment with the water repellent organic compound is not particularly limited, and examples thereof include silicone oil, alkylsilane, alkyl titanate, alkyl aluminate, polyolefin, polyester, metal soap, amino acid, amino acid salt and the like. Among them, silicone oil is preferable in view of chemical stability. Specific examples of this silicone oil include dimethylpolysiloxane (for example, Shin-Etsu Chemical KF-96A-100cs, Asahi Kasei Wacker Silicone DM10), methylhydrogenpolysiloxane (for example Shin-Etsu Chemical KF-99P, Toray. Dow Corning SH1107C, (dimethicone / methicone) copolymer (eg, Shin-Etsu Chemical KF-9901), methylphenyl silicone (eg, Shin-Etsu Chemical KF-50-100 cs), amino-modified silicone (eg, Shin-Etsu Chemical) KF-8015, Toray Dow Corning JP-8500 Conditioning Agent, Asahi Kasei Wacker Silicone ADM 6060), triethoxysilylethyl polydimethylsiloxyethyl dimethicone (for example, Shinetsu Manabu Kogyo KF-9908), triethoxysilyl ethyl polydimethylsiloxy hexyl dimethicone (for example, a treatment by Shin-Etsu Chemical KF-9909).

  As the treatment with the above-mentioned silane coupling agent, vinyltris (2-methoxyethoxy) silane, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, 2- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, 3-glycone Cidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethylsilane Methoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, 3-acryloxypropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyl Methyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltrimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminotriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N- (vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, 3-ureidopropyl Triethoxysilane, 3-chloropropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-mercaptopropyltrimethoxysilane, bis (triethoxysilylpropyl) tetrasulfide, 3-isocyanatopropyltriethoxysilane, tetramethosilane Shishiran, tetraethoxysilane, methyl trimethoxysilane, methyl triethoxysilane, phenyl triethoxy silane, hexamethyldisilazane, hexyltrimethoxysilane and decyltrimethoxysilane.

  As treatment with the above-mentioned titanium coupling agent, tetraisopropyl titanate, tetranormal butyl titanate, butyl titanate dimer, tetra (2-ethylhexyl) titanate, tetramethyl titanate, titanium acetylacetonate, titanium tetraacetylacetonate, titanium ethyl acetoacetate And titanium octanediolate, titanium lactate, titanium triethanolaminate, and polyhydroxy titanium stearate.

  In the case of performing the above surface treatment (surface treatment to be applied to the surface of the hexagonal plate-like zinc oxide particles in advance before keratin treatment), the surface treatment is 0.1 to 30% by weight with respect to the total amount of powder after treatment. It is preferable to carry out in the following ratio. By setting it as the thing within the said range, it is preferable at the point that slipperiness improves, and moisture resistance improves and the dispersibility to resin improves.

   The primary particle diameter of the particulate composite according to the present invention is preferably equivalent to the primary particle diameter of the hexagonal plate-like zinc oxide particles described above, and in particular, the particle diameter is preferably 0.1 to 5 μm, 0.2 to 0.2 The thickness is more preferably 4 μm, and still more preferably 0.5 to 3 μm. With such a primary particle diameter, it has higher smoothness, low roughness, and is more excellent due to the near infrared reflection effect.

  In addition, the primary particle diameter of the granular composite is a diagonal diameter (in particular, the granular composite) in a field of 2000 to 50000 times of a photograph taken with a scanning electron microscope (SEM) (for example, JSM-6510A: manufactured by Nippon Denshi Co., Ltd.) In the case of a hexagonal plate shape, the length of any one of the three diagonals of the hexagonal plate surface) (μm) is measured for 100 particles, and 50% of its cumulative distribution It is the calculated value.

  The granular composite according to the present invention preferably has an aspect ratio of 2.5 or more. The aspect ratio is more preferably 2.7 or more, and still more preferably 3.0 or more. By having a plate shape having an aspect ratio of 2.5 or more, it is possible to have higher smoothness, lower roughness and higher near infrared reflection effect derived from the shape.

  In the case where the granular composite has a hexagonal plate shape, the aspect ratio is hexagonal in a field of 2000 to 50000 times that of a photograph of the hexagonal plate-like granular composite taken with a scanning electron microscope (SEM). For particles in which the surface of the plate-like granular composite faces the front, 100 diagonal particles (the length of any one of the three diagonals of the hexagonal plate surface) (μm) The measured average value is L, and for particles in which the side face of the hexagonal plate-like granular composite faces the front (particles that appear to be rectangular), the thickness (μm) (length of the shorter side of the rectangle) is 100 particles When an average value obtained by minute measurement is T, it is a value obtained as a ratio (L / T) of those values.

  The granular composite according to the present invention can exhibit excellent smoothness and low roughness, for example, when it is used by being blended in a composition for external use. Specifically, the particulate composite (powder) according to the present invention exhibits a small MIU (mean friction coefficient) and a small MMD (mean deviation of the friction coefficient). The smaller the value of the MIU (mean friction coefficient), the better the slipperiness, which means that it is slippery. Also, the smaller the value of MMD (average deviation of the coefficient of friction), the less the rough feeling. In addition, the comparison object here is the hexagonal plate-like zinc oxide particle itself used as a raw material of the granular composite. More specifically, the granular composite (powder) according to the present invention has a smaller MIU (average coefficient of friction) than the hexagonal plate-like zinc oxide particles (powder) used as the raw material of the granular composite. And MMD (mean deviation of the coefficient of friction).

  For example, although not particularly limited, for example, in the particulate composite (powder) according to the present invention, the MIU is preferably 1.15 or less, more preferably 1.1 or less, and 1.05 or less Is more preferred. Moreover, it is preferable that MMD is 0.05 or less. The MMD is more preferably 0.04 or less, or 0.03 or less. Among these, those satisfying both the MIU value and the MMD value are preferable.

  The MIU value and the MMD value are values measured as follows. That is, using a friction tester (for example, KES-SE friction tester (manufactured by Kato Tech)), for a granular composite (powder) stretched on a double-sided tape, the friction measurement load 25 gf, surface measurement sample moving speed It is a value obtained by measuring MIU and MMD under conditions of 1 mm / sec and a measuring distance range of 20 mm.

  The particulate composite according to the present invention can be mixed with other components and incorporated, for example, into a composition for external use (for example, pharmaceuticals, quasi-drugs and cosmetics), ink, paint, plastics and the like. In particular, since it has the above-mentioned characteristics, it is preferable in that it can obtain an external use composition having an excellent powder feel that it has good slipperiness and less roughness. Above all, they are suitable for use in cosmetics.

The above cosmetic is not particularly limited, and by mixing cosmetic powder with such powder, if necessary, UV protective cosmetic such as sunscreen agent; base makeup cosmetic such as foundation; point makeup such as lipstick Cosmetics, skin care cosmetics such as lotions and creams, hair care cosmetics such as treatments and styling agents, etc. can be obtained. In addition to the excellent powder feel mentioned above, the hexagonal plate-like zinc oxide particles of the present invention also have ultraviolet absorbing ability, and therefore have excellent performance when used in cosmetics.
The cosmetic may be in any form such as oily cosmetic, aqueous cosmetic, O / W cosmetic, W / O cosmetic and the like.

  The cosmetic may be used in combination with any aqueous component or oil component that can be used in the cosmetic field. The aqueous component and the oily component are not particularly limited, and examples thereof include oils, surfactants, moisturizers, higher alcohols, sequestering agents, natural and synthetic polymers, water-soluble and oil-soluble polymers, ultraviolet screening agents, Extracts, coloring agents such as organic dyes, preservatives, antioxidants, dyes, thickeners, pH adjusters, perfumes, cooling agents, antiperspirants, bactericides, skin activators, various powders, etc. It may contain ingredients.

  The above oil agent is not particularly limited, but, for example, natural animal and vegetable fats and oils (eg, olive oil, mink oil, castor oil, palm oil, beef tallow, evening primrose oil, coconut oil, castor oil, castor oil, cocoa oil, macadamia nut oil etc.); , Jojoba oil, beeswax, lanolin, carnauba wax, candelilla wax, etc .; higher alcohols (eg, lauryl alcohol, stearyl alcohol, cetyl alcohol, oleyl alcohol, etc.); higher fatty acids (eg, lauric acid, palmitic acid, stearic acid, olein) Acids, behenic acid, lanolin fatty acids, etc .; higher aliphatic hydrocarbons (eg, liquid paraffin, solid paraffin, squalane, vaseline, ceresin, microcrystalline wax, etc.); synthetic ester oils (eg, butyl stearate, hexyl laurate, diisopropyl ester) A PETE, diisopropyl sebacate, octyldodecyl myristate, isopropyl myristate, isopropyl palmitate isopropyl myristate, cetyl isooctanoate, neopentyl glycol dicaprate, silicone derivatives (eg, methyl silicone, methyl phenyl silicone, etc.) Furthermore, oil-soluble vitamins, preservatives, whitening agents, etc. can also be blended.

  Examples of the surfactant include lipophilic nonionic surfactants and hydrophilic nonionic surfactants. The above-mentioned lipophilic nonionic surfactant is not particularly limited. For example, sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan triole Sorbitan fatty acid esters such as alate, diglycerol sorbitan penta-2-ethylhexyl acid, diglycerol sorbitan tetra-2-ethylhexyl acid, mono cotton seed oil fatty acid glycerin, glycerol monoerucate glycerine sesquioleate, glycerin monostearate α, α '-Proline of glycerin polyglycerin fatty acids such as pyroglutamate oleic acid pyroglutamate, glycerin monostearic acid malic acid, propylene glycol monostearate etc. Examples thereof include glycol fatty acid esters, hydrogenated castor oil derivatives, glycerin alkyl ether and the like.

  The hydrophilic non-ionic surfactant is not particularly limited. For example, POE sorbitan monooleate, POE sorbitan monostearate, POE sorbitan fatty acid esters such as POE sorbitan tetraoleate, POE sorbit monolaurate, POE sorbit mono POE sorbite fatty acid esters such as oleate, POE sorbite pentaoleate, POE sorbite monostearate POE glycerin monostearate POE glycerin mono isostearate POE glycerin fatty acid esters such as POE glycerin triisostearate POE POE fatty acid esters such as mono oleate, POE distearate, POE dioleate, ethylene glycol distearate, POE lauryl ether, POE oley POE alkyl ethers such as ether, POE stearyl ether, POE behenyl ether, POE 2-octyldodecyl ether, POE cholestanol ether, POE alkyl phenyl ethers such as POE octyl phenyl ether, POE nonyl phenyl ether, POE dinonyl phenyl ether, Pluronic types such as bluronics, POE · POP cetyl ether, POE · POP 2-decyl tetradecyl ether, POE · POP monobutyl ether, POE · POP hydrogenated lanolin, POE · POP alkyl ethers such as POE · glycerin glycerin ether, tee Toronika et al. Tetra POE · tetra POP ethylene diamine condensates, POE castor oil, POE hydrogenated castor oil, POE hydrogenated castor oil mono isosteare POE castor oil-cured castor oil derivatives such as POE-cured castor oil triisostearate, POE-cured castor oil monopyroglutamic acid monoisostearate diester POE-cured castor oil maleic acid POE beeswax lanolin derivatives such as POE sorbite beeswax , Coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, alkanolamide such as fatty acid isopropanolamide, POE propylene glycol fatty acid ester, POE alkylamine, POE fatty acid amide, sucrose fatty acid ester, POE nonylphenylformaldehyde condensate, alkylethoxydimethyl Amine oxide, trioleyl phosphate and the like can be mentioned.

  Other surfactants include, for example, anionic surfactants such as fatty acid soap, higher alkyl sulfate ester salt, POE lauryl sulfate triethanolamine, alkyl ether sulfate ester salt, alkyl trimethyl ammonium salt, alkyl pyridinium salt, alkyl quaternary Stability of cationic surfactants such as ammonium salts, alkyldimethylbenzyl ammonium salts, POE alkylamines, alkylamine salts and polyamine fatty acid derivatives, and amphoteric surfactants such as imidazoline based amphoteric surfactants and betaine based surfactants And you may mix | blend in the range which has no problem in skin irritation.

  The above-mentioned humectant is not particularly limited, and examples thereof include xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, mucotin sulfate, caronic acid, atelocollagen, cholesteryl-12-hydroxystearate, sodium lactate, bile salt, dl- There may be mentioned pyrrolidone carboxylate, short chain soluble collagen, diglycerin (EO) PO adduct, Izayoira extract, Yarrow extract, Meriloto extract and the like.

  The above-mentioned higher alcohol is not particularly limited, and examples thereof include linear alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, monostearyl glycerin ether (batyl alcohol), 2-decyl Examples include branched alcohols such as tetradecinol, lanolin alcohol, cholesterol, phytosterol, hexyldodecanol, isostearyl alcohol, octyldodecanol and the like.

  The sequestering agent is not particularly limited. For example, 1-hydroxyethane-1,1-diphosphonic acid, 1-hydroxyethane-1,1-diphosphonic acid tetrasodium salt, sodium citrate, sodium polyphosphate, metaphosphoric acid Sodium, gluconic acid, phosphoric acid, citric acid, ascorbic acid, succinic acid, edetic acid and the like can be mentioned.

The above-mentioned naturally-occurring water-soluble polymer is not particularly limited. For example, arabia gum, tragacanth gum, galactan, guar gum, carob gum, caraya gum, carrageenan, pectin, agarten, quince seed (marello), arge colloid (kaso extract), starch (rice, Plant polymers such as corn, potato, wheat), glycyrrhizinic acid, microbial polymers such as xanthan gum, dextran, succinoglucan, pullulan, and animal polymers such as collagen, casein, albumin, gelatin, etc. .
The semi-synthetic water-soluble polymer is not particularly limited, and examples thereof include starch-based polymers such as carboxymethyl starch and methyl hydroxypropyl starch, methyl cellulose, nitrocellulose, ethyl cellulose, methyl hydroxypropyl cellulose, hydroxyethyl cellulose, cellulose sodium sulfate, Examples thereof include cellulose polymers such as hydroxypropyl cellulose, sodium carboxymethyl cellulose (CMC), crystalline cellulose and cellulose powder, and alginic acid polymers such as sodium alginate and alginic acid propylene glycol ester.

  The synthetic water-soluble polymer is not particularly limited, and examples thereof include vinyl polymers such as polyvinyl alcohol, polyvinyl methyl ether, and polyvinyl pyrrolidone, and polyoxyethylene polymers such as polyethylene glycol 20,000, 40,000, and 60,000. Polymer, polyoxyethylene-polyoxypropylene copolymer copolymer, sodium polyacrylate, polyethyl acrylate, acrylic polymer such as polyacrylamide, polyglycerin, polyethyleneimine, cationic polymer, carboxyvinyl polymer, alkyl Modified carboxyvinyl polymer, (Hydroxyethyl acrylate / Acryloyldimethyltaurine Na) copolymer, (Na-acrylate / Acryloyldimethyltaurine Na) copolymer, (Acryloyldimethylta) Phosphorus ammonium / vinylpyrrolidone) copolymer, and (ammonium acryloyldimethyltaurate methacrylate Beheneth-25) cross-polymer.

The inorganic water-soluble polymer is not particularly limited, and examples thereof include bentonite, AlMg silicate (bee gum), laponite, hectorite, and silicic acid anhydride.
The UV screening agent is not particularly limited. For example, paraaminobenzoic acid (hereinafter abbreviated as PABA), PABA monoglycerin ester, N, N-dipropoxy PABA ethyl ester, N, N-diethoxy PABA ethyl ester, N, N-dimethyl ester Benzoic acid type ultraviolet screening agents such as PABA ethyl ester, N, N-dimethyl PABA butyl ester; anthranilic acid type ultraviolet screening agents such as homomentyl-N-acetyl anthranilate; amyl salicylate, menthyl salicylate, homomentyl salicylate, octyl salicylate Salicylic acid based ultraviolet screening agents such as phenyl salicylate, benzyl salicylate, p-isopropanol phenyl salicylate and the like; octyl cinnamate, ethyl-4-isopropyl cinnamate, methyl-2,5- Isopropylcinnamate, ethyl-2,4-diisopropylcinnamate, methyl-2,4-diisopropylcinnamate, propyl-p-methoxycinnamate, isopropyl-p-methoxycinnamate, isoamyl-p-methoxycinnamate, 2- Ethoxyethyl-p-methoxycinnamate, cyclohexyl-p-methoxycinnamate, ethyl-α-cyano-β-phenylcinnamate, 2-ethylhexyl-α-cyano-β-phenylcinnamate, glyceryl mono-2-ethylhexanoate UV-screening agents based on cinnamic acid such as noyl-diparamethoxycinnamate; 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone , 2, 2 ', 4,4'-Tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-4'-methylbenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonate, 4-phenylbenzophenone Benzophenone-based ultraviolet screening agents such as 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy-4-n-octoxybenzophenone, 4-hydroxy-3-carboxybenzophenone and the like; 3- (4 ') -Methylbenzylidene) -d, l-camphor, 3-benzylidene-d, l-camphor, urocanic acid, urocanic acid ethyl ester, 2-phenyl-5-methylbenzoxazole, 2,2'-hydroxy-5-methyl Phenyl benzotriazole, 2 (2′-hydroxy-5′-t-octylphenyl) benzotriazole, 2- (2′-hydroxy-5′-methylphenylbenzotriazole, dibenzalazine, dianisoylmethane, 4-methoxy-4′-t-butyldi Examples include benzoylmethane, 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one and the like.

  Other pharmaceutical ingredients are not particularly limited. For example, vitamin A oil, retinol, retinol palmitate, inositol, pyridoxine hydrochloride, benzyl nicotinate, nicotinic acid amide, nicotinic acid DL-α-tocopherol, magnesium ascorbate phosphate, 2 -O-α-D-glucopyranosyl-L-ascorbic acid, vitamin D2 (ergocasiferol), dl-α-tocopherol, dl-α-tocopherol acetate, pantothenic acid, vitamins such as biotin; estradiol, ethynyl estradiol etc. Hormones; amino acids such as arginine, aspartic acid, cystine, cysteine, methionine, serine, leucine and tryptophan; anti-inflammatory agents such as allantoin and azulene; whitening agents such as arbutin; astringents such as tannic acid; Menthol, cooling agents and sulfur camphor such as, lysozyme chloride, can be mentioned pyridoxine chloride, and the like.

  The various extract solutions are not particularly limited, and, for example, Dokudami extract, Ginseng extract, Meriloto extract, Odorikoso extract, licorice extract, Licorice extract, Paeonysia extract, Sabong extract, Hechima extract, Kina extract, Yukinoshita extract, Clara extract, Koho Neon extract, English extract Extract, primrose extract, rose extract, diower extract, lemon extract, shone extract, aloe extract, shrub root extract, eucalyptus extract, sugina extract, sage extract, thyme extract, tea extract, seaweed extract, cucumber extract, clove extract, raspberry extract, melissa extract , Carrot extract, Maronie extract, peach extract, peach leaf extract, mulberry extract, cornflower extract, hamamelis extract, placenta extract, thymus extract, silk extract, licorice Mention may be made of the kiss and the like.

  As the above various powders, bright color pigments such as bengara, yellow iron oxide, black iron oxide, mica titanium, iron oxide coated mica titanium, titanium oxide coated glass flakes, mica, talc, kaolin, sericite, titanium dioxide, Examples thereof include inorganic powders such as silica and organic powders such as polyethylene powder, nylon powder, crosslinked polystyrene, cellulose powder and silicone powder. Preferably, part or all of the powder component is treated with a substance such as silicones, a fluorine compound, a metal soap, an oil agent, an acyl glutamate salt and the like by a known method to improve sensory characteristics and cosmetic persistence. Used. In addition, other composite powders not falling under the present invention may be mixed and used.

  When the particulate composite according to the present invention is used as an additive component to the ink, titanium oxide, red iron oxide, antimony red, cadmium yellow, cobalt blue, bitumen, ultramarine, carbon black, colored pigments such as graphite, calcium carbonate And extender pigments such as kaolin, clay, barium sulfate, aluminum hydroxide and talc. Furthermore, as organic pigments, pigment components such as soluble azo pigments, insoluble azo pigments, azo lake pigments, condensed azo pigments, copper phthalocyanine pigments, condensed polycyclic pigments, etc .; shellac resin, acrylic resin, styrene-acrylic resin, styrene-maleic acid resin Binder resins such as styrene-acrylic-maleic acid resin, polyurethane resin, polyester resin, polyamide resin; water-miscible organic solvents etc. can be used in combination.

  When the particulate composite according to the present invention is used as an additive component to a coating composition, coating film-forming resins such as acrylic resin, polyester resin, epoxy resin, etc .; various pigments such as coloring pigment, extender pigment, glitter pigment; It can be used in combination with a curing catalyst, a surface control agent, an antifoaming agent, a pigment dispersant, a plasticizer, a film forming aid, an ultraviolet light absorber, an antioxidant and the like. In addition, the resin in the paint may be curable or non-curable.

  The present invention also encompasses a resin composition containing the above-described particulate composite according to the present invention. Such a resin composition has excellent heat dissipation properties by the particulate composite acting as a heat dissipation filler. Furthermore, since it is excellent in infrared (especially near infrared) reflective power, it can also be used as a resin composition which has these performances.

  The hexagonal plate-like zinc oxide particles of the present invention, as described above, have infrared (especially near infrared) reflection performance, and can also be used as an infrared (especially near infrared) shielding material in various fields.

  In the present specification, the term "comprising" also includes "consisting essentially of" and "consisting of" (The term "comprising" includes "consisting essentially of" and "consisting of.").

  Hereinafter, the present invention will be described more specifically, but the present invention is not limited to the following examples.

(Example 1): Cationized hydrolytic keratin treatment to XZ-1000F (5% by mass)
150 g of hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 0.66 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while stirring the slurry, an aqueous solution of cationized hydrolyzed keratin (stealdimonium hydroxypropyl hydrolyzed keratin) having a purity of 15% such that the amount of keratin added is 5% by mass with respect to 95% by mass of zinc oxide : 52.6 g of promois WK-SAQ, manufactured by Sariwa Kasei Co., Ltd. were added. After aging for 60 minutes as it is, filtration, washing with water, and drying at 40 ° C. for 16 hours, a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 0.67 μm was obtained. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Example 2): Silylation hydrolytic keratin treatment to XZ-1000F (5% by mass)
150 g of hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 0.66 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while stirring the slurry, a 25% pure aqueous solution of silylated hydrolyzed keratin ((dihydroxymethylsilylpropoxy) hydroxypropyl hydrolized so that the amount of keratin added is 5% by mass with respect to 95% by mass of zinc oxide Degraded keratin: 31.6 g of promois WK-HSIGF (manufactured by Seiwa Kasei) was added. After aging for 60 minutes as it is, filtration, washing with water, and drying at 40 ° C. for 16 hours, a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 0.64 μm was obtained. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Example 3): Hydrolysis keratin treatment to XZ-1000F (5 mass%)
150 g of hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 0.66 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while the slurry was stirred, 7.9 g of a hydrolyzed keratin powder (manufactured by Seiwa Kasei Co., Ltd.) was added such that the amount of keratin added was 5% by mass with respect to 95% by mass of zinc oxide. After aging for 60 minutes as it is, filtration, washing with water, and drying at 40 ° C. for 16 hours, a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 0.63 μm was obtained. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Example 4): Natural keratin treatment to XZ-1000F (5% by mass)
150 g of hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 0.66 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while stirring the slurry, 158.0 g of a natural keratin aqueous solution (manufactured by Siwa Chemical Co., Ltd.) having a purity of 5% was added so that the amount of keratin added was 5% by mass with respect to 95% by mass of zinc oxide . After aging for 60 minutes as it is, filtration, washing with water and drying at 40 ° C. for 16 hours were carried out to obtain a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 0.66 μm. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Example 5): Cationized hydrolytic keratin treatment to XZ-1000F (1% by mass)
150 g of hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 0.66 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while stirring the slurry, an aqueous solution of cationized hydrolyzed keratin (stealdimonium hydroxypropyl hydrolyzed keratin: purity 15% so that the amount of keratin added is 1% by mass with respect to 99% by mass of zinc oxide 10.1 g of promois WK-SAQ, manufactured by Sariwa Kasei Co., Ltd. were added. After aging for 60 minutes as it was, filtration, washing with water and drying at 40 ° C. for 16 hours were carried out to obtain a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 0.70 μm. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Example 6) Cationized hydrolytic keratin treatment (10% by mass) to XZ-1000F
A keratin and zinc oxide particle-containing particulate composite is obtained in the same manner as in Examples 1 and 5 except that the addition amount of keratin is changed so that the addition amount of keratin to 90% by mass of zinc oxide is 10% by mass. , Form observation and physical property evaluation.

(Example 7) Cationized hydrolytic keratin treatment (20% by mass) to XZ-1000F
The keratin and zinc oxide particle-containing granular composite is obtained in the same manner as in Examples 1 and 5 except that the addition amount of keratin relative to 80% by mass of zinc oxide is changed to 20% by mass. Morphological observation and physical property evaluation were performed.

(Example 8): Cationic hydrolytic keratin treatment to XZ-3000F (5% by mass)
150 g of hexagonal plate-like zinc oxide (XZ-3000F, manufactured by Sakai Chemical Industry Co., Ltd.) having a particle diameter of 2.08 μm was added to 750 g of water and sufficiently stirred to obtain an aqueous slurry with a zinc oxide concentration of 193 g / L. Subsequently, while stirring the slurry, an aqueous solution of cationized hydrolyzed keratin (stealdimonium hydroxypropyl hydrolyzed keratin: purity 15% so that the amount of keratin added is 5% by mass with respect to 95% by mass of zinc oxide 52.6 g of promois WK-SAQ, manufactured by Sariwa Kasei Co., Ltd. was added. After aging for 60 minutes as it is, filtration, washing with water and drying at 40 ° C. for 16 hours were carried out to obtain a granular composite containing keratin and zinc oxide particles having a primary particle diameter of 2.15 μm. The size and form of the obtained granular composite were observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

(Comparative Example 1): No treatment XZ-1000F
Hexagonal plate-like zinc oxide (XZ-1000F, manufactured by Sakai Chemical Industry Co., Ltd.) was used as particles for comparison. The primary particle size was 0.66 μm. The morphology of the particles was observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.). In addition, as is clear from the above contents, the particles are zinc oxide particles serving as a matrix of the keratin- and zinc oxide particle-containing particulate composites obtained in Examples 1, 2, 3, 4 and 5.

(Comparative Example 2): No treatment XZ-3000F
Hexagonal plate-like zinc oxide (XZ-3000F, manufactured by Sakai Chemical Industry Co., Ltd.) was used as particles for comparison. The primary particle size was 2.08 μm. The morphology of the particles was observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.). In addition, the said particle | grain is a zinc oxide particle used as the base of the keratin and the zinc oxide particle containing granular composite body obtained in Example 6. FIG.

Comparative Example 3 Amorphous Zinc Oxide Particles Amorphous zinc oxide (type 1 zinc oxide: JIS standard, manufactured by Sakai Chemical Industry Co., Ltd.) was used as particles to be compared. The primary particle size was 0.48 μm. The morphology of the particles was observed with a scanning electron microscope JSM-6510A (manufactured by Nippon Denshi Co., Ltd.).

Measurement of MIU (average friction coefficient) MIU (average friction coefficient) was measured with a KES-SE friction tester (manufactured by Kato Tech Co., Ltd.) for a granular composite containing keratin and hexagonal zinc oxide particles. Specifically, a double-sided tape with a width of 25 mm is attached to a slide glass, the granular composite (powder) is placed, stretched with a cosmetic puff, and MIU (average friction) is measured by a KES-SE friction tester (manufactured by Kato Tech). Coefficient) was measured. The measurement was performed under the conditions of a friction measurement load of 25 gf, a surface measurement sample moving speed of 1 mm / sec, and a measurement distance range of 20 mm. As a sensor, a silicone contactor (frictional element made of silicone rubber with irregularities assumed to be a human finger) was used.

Measurement of MMD ( Average Deviation of Friction Coefficient) MMD ( average deviation of friction coefficient) was measured for a granular composite containing keratin and hexagonal zinc oxide particles with a KES-SE friction tester (manufactured by Kato Tech). Specifically, a double-sided tape with a width of 25 mm is attached to a slide glass, the granular composite (powder) is placed, stretched with a cosmetic puff, and the MMD (coefficient of friction) is measured by a KES-SE friction tester (manufactured by Kato Tech). The average deviation of The measurement was performed under the conditions of a friction measurement load of 25 gf, a surface measurement sample moving speed of 1 mm / sec, and a measurement distance range of 20 mm. As a sensor, a silicone contactor (frictional element made of silicone rubber with irregularities assumed to be a human finger) was used.

Measurement of Primary Particle Size The primary particle size of the hexagonal zinc oxide particles and the particulate complex is 2000 to 50000 times the photograph taken with a scanning electron microscope (SEM) (JSM-6510A: manufactured by Nippon Denshi Co., Ltd.) Diameter in the field of view (if the hexagonal zinc oxide particles or granular composite is in the form of a hexagonal plate, the length of any one of the three diagonals of the hexagonal plate surface) (μm ) Was measured for 100 particles, and the value was obtained from 50% of the cumulative distribution.
The primary particle diameter of the irregularly shaped particles is the average XY axis diameter (X sandwiching the particles in a field of 2000 to 50000 times of the photograph of the particles taken with a scanning electron microscope (SEM) (JSM-6510A: made by Nippon Denshi Co.) The particle diameter (μm) defined by the axial direction and the Y-axis direction, the length obtained by averaging the distance between two parallel lines) is measured for 100 particles, and the value determined from 50% of the cumulative distribution is there.

Measurement of Keratin Content in Particulate Composite The particulate composite and the hexagonal zinc oxide particles as a raw material thereof were placed in a crucible of 2 g each and heated in an electric furnace at 500 ° C. for 1 hour. Each weight was measured after heating. The keratin content (% by mass) in the particulate composite is assumed to be all keratin in the particulate composite has disappeared, and the reduction rate of the hexagonal zinc oxide particles as the raw material is the same regardless of which Was calculated.

Measurement of spectral reflectance The spectral reflectance was measured by a spectrophotometer (V-570, manufactured by JASCO Corporation). More specifically, the particulate composite or particles obtained in each Example and each Comparative Example were placed in a dedicated cell, mounted on a spectrophotometer, and the spectral reflectance at each wavelength was measured. Since the reflectance = 100−absorptivity, the more the absorption, the lower the reflectance, which is preferable.

  The above examination results are shown in the following table. Further, the evaluation results of the physical properties of the obtained particles are also shown in the following table. Furthermore, the number average molecular weight of each keratin used is also shown in the following table. The spectral reflectance measurement results are shown in FIGS. 1 and 2.

Claims (7)

A particulate complex comprising keratin and hexagonal plate-like zinc oxide particles. The granular composite according to claim 1, comprising keratin on the surface of hexagonal plate-like zinc oxide particles. The particulate composite according to claim 1 or 2, wherein the keratin is at least one selected from the group consisting of natural keratin, hydrolyzed keratin, cationized hydrolyzed keratin, and silylated hydrolyzed keratin. The granular composite according to any one of claims 1 to 3, wherein the keratin content is 0.05 to 5% by mass. The particulate composite according to any one of claims 1 to 4, wherein the primary particle size is 0.1 to 5 m. An external composition comprising the particulate composite according to any one of claims 1 to 5. The composition for external use according to claim 6, which is a cosmetic composition, a quasi-drug composition or a pharmaceutical composition.