JP2012131783A - Powdery cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powdery cosmetic that has high unevenness correction effect and yields excellent transparent finish.SOLUTION: The powdery cosmetic comprises a powdery component and an oily component. The powdery cosmetic comprises 1-20 mass% rutile type titanium oxide particle aggregates having an average particle size of 0.2-0.4 μm and an average friction coefficient (MIU value) of 0.4-0.6 as the powdery component in the cosmetic and 3-20 mass% oily component in the cosmetic. Here, mixing of the powdery component with the oily component is carried out by a mixer of a facing rotor type. The mixer has a first rotor and a second rotor, each having a plurality of blades, disposed in a mixing chamber in such a mutually facing state as having individual rotation shafts on the same axis in the substantially horizontal direction. In the mixer, raw materials are charged from a charging port on the first rotor side, mixed by rotating the first rotor and the second rotor in mutually opposite directions, and then discharged from a discharging port on the second rotor side.

Description

  The present invention relates to a powder cosmetic, and particularly to a powder cosmetic excellent in unevenness correction effect and transparency.

  Conventionally, there has been a demand for cosmetics with high unevenness correction effect that makes skin unevenness such as pores and fine lines inconspicuous and make the skin look smooth, and powder cosmetics such as foundations are also desired to have high unevenness correction effect Yes.

In order to make the unevenness inconspicuous, pigment grade titanium dioxide and zinc oxide with high refractive index and high hiding power may be blended in large quantities, but hiding power depends on high refractive index powder of titanium dioxide or zinc oxide In this case, light is scattered in the visible light region, and the appearance of the skin produces a so-called “whitening”. Therefore, normally, black iron oxide or the like is blended together with the titanium dioxide or the like to suppress whitening.
However, according to such a foundation, since the hiding power is high, the wrinkles on the skin are concealed, the skin-specific transparency is lost, an unnatural matte feeling is generated, and the unevenness of the skin is rather noticeable. Sometimes it stands up.

In recent years, there has been known a foundation that realizes not only unevenness concealment but also transparency by adjusting saturation using optical characteristics (Patent Document 1).
However, since the foundation has high saturation, formulation design may be limited.

JP 2008-285429 A

  The present invention has been made in view of the background art described above, and an object of the present invention is to provide a powder cosmetic that has a high unevenness correction effect and is also excellent in finished transparency.

  As a result of intensive studies by the present inventors in order to solve the above-mentioned problems, it has been found that a powder cosmetic excellent in unevenness correction effect and transparency can be obtained by blending specific titanium oxide. Also, by mixing the powder component and the oil component using a specific device, the unevenness correction effect and transparency can be improved, or in the case of a solid powder cosmetic, a solid powder makeup with high impact resistance. It became clear that the fee could be obtained. Moreover, it discovered that the powder cosmetics with which an uneven | corrugated correction effect and a transparent feeling last were obtained by using a specific polyurethane particle together, and came to complete this invention.

That is, the powder cosmetic according to the present invention is a powder cosmetic containing a powder component and an oil component,
As a powder component, 1-20% by mass of rutile-type titanium oxide aggregated particles having an average particle diameter of 0.2 to 0.4 μm and an average coefficient of friction (MIU value) of 0.4 to 0.6 are contained in the cosmetic. And
Containing 3 to 20% by mass of an oily component in the cosmetic,
The mixing of the powder component and the oil component is performed in the mixing chamber in a state in which the first rotary blade and the second rotary blade provided with a plurality of blades face each other on the same axis in the substantially horizontal direction. The raw material is supplied from the inlet on the first rotor blade side, and the raw material is mixed by rotating the first rotor blade and the second rotor blade in directions opposite to each other, from the outlet on the second rotor blade side. Provided is a powder cosmetic characterized by being carried out by a rotary blade-facing mixing device that discharges the mixed raw material.

  Further, the present invention provides the cosmetic according to any one of the above, further comprising polyurethane particles, wherein the polyurethane particles are coated with a hydrophilic silica fine powder group on the surface of the polyurethane particles, An isocyanate-terminated urethane prepolymer obtained by the reaction of a polyisocyanate component and a polyol component containing polytetramethylene glycol is three-dimensionally polymerized with a trifunctional or higher polyfunctional amine. Provide powder cosmetics.

Moreover, this invention provides the powder cosmetics characterized by being solid in the cosmetics in any one of the said.
Moreover, this invention provides the foundation which consists of the powder cosmetics in any one of the said.

  According to this invention, the powder cosmetics which are excellent in an unevenness | corrugation correction effect and transparency are obtained by mix | blending specific rutile type titanium oxide aggregated particles. In addition, by mixing the powder component and the oil component using a specific device, the unevenness correction effect and transparency are further improved, and in the case of a solid powder cosmetic, a solid powder makeup with high impact resistance. A fee is obtained. Furthermore, by using specific polyurethane particles in combination, a powder cosmetic that maintains the unevenness correction effect and the transparency can be obtained.

It is a figure which shows the spectral transmittance | permeability of (a) rutile type titanium oxide aggregated particle used by this invention, and (b) pigment grade titanium dioxide. It is the schematic of an example of the rotary blade facing type mixing apparatus used in this invention.

Rutile type titanium oxide aggregated particles In the present invention, rutile type titanium oxide aggregates having an average particle size of 0.2 to 0.4 μm and an average friction coefficient (MIU value) of 0.4 to 0.6 as a powder component. Contains particles. Here, the titanium oxide aggregated particles are titanium dioxide aggregated particles.

  In the rutile-type titanium oxide aggregated particles used in the present invention, rod-shaped particles having a side size of 0.05 to 0.2 μm and a thickness direction of 0.02 to 0.1 μm are assembled and / or bonded. Fan-shaped rutile-type titanium oxide particles are formed by further agglomeration. The agglomerated particles have an average particle size of 0.2 to 0.4 μm and an average friction coefficient (MIU value) of 0.4 to 0.00. 6.

  Pigment-grade titanium oxide that is not aggregated particles has a high average friction coefficient (MIU value), for example, 0.75 (0.3 μm), even if the particle diameter is the same (0.2 to 0.4 μm).

Here, it is preferable that the particle size of the aggregated particles is an observation particle size by a transmission electron microscope.
The average friction coefficient is measured using, for example, Kato Tech Co., Ltd. friction tester KES-SE. The measured powder is evenly spread on the artificial leather to 1 mg / cm ² with a finger, It can be determined under the condition of 25 g.

  The rutile-type titanium oxide aggregated particles used in the present invention are composed of aggregates of fan-shaped rutile-type titanium oxide particles composed of rod-shaped primary particles, and when the rutile-type titanium oxide aggregated particles are produced, a completely firing step is performed. It is characterized by not passing through.

By blending such rutile-type titanium oxide aggregated particles, a powder cosmetic that exhibits a high correction effect on the unevenness of the skin and is extremely excellent in the finished transparency can be obtained. If the average particle size is outside the range of 0.2 to 0.4 μm, the skin unevenness correction effect and the transparency will be insufficient. Even if the particle diameter is the same (0.2 to 0.4 μm), the effect of the present invention cannot be obtained with pigment-grade titanium oxide that is not aggregated particles.
The rutile-type titanium oxide aggregated particles used in the present invention are aggregates of fan-shaped titanium oxide particles, have an average coefficient of friction (MIU value) lower than that of pigment-grade titanium oxide, and undergo a firing step in the production process. It is also excellent in that it has no squeaky or rough surface and is easy to stretch.

  The rutile-type titanium oxide aggregated particles used in the present invention are more preferably spherical in terms of correction effect, transparency, and smoothness to the skin. The term “spherical” as used herein includes a diatom-like shape and a chestnut-like shape.

FIG. 1 shows the spectral transmittance of (a) rutile-type titanium oxide aggregated particles used in the present invention and (b) pigment-grade titanium dioxide. The average particle diameter was 0.3 μm in all cases, and the measurement was performed as follows.
(Measuring method)
Clear lacquer LC21 (manufactured by Genchu Chemical Industry Co., Ltd.) was added to (a) and (b) so as to be a 6 wt% dispersion, and dispersed with a disper. The prepared slurry was placed on an OHP sheet, and a film thickness of 0.101 μm was obtained with a doctor blade. After drying, the spectral transmittance was measured with a spectrophotometer U-3500 (manufactured by Hitachi).

As can be seen from FIG. 1, the rutile-type titanium oxide aggregated particles used in the present invention have a high transmittance on the long wavelength side in the visible light region and a higher transmittance of red light than blue light. On the other hand, such spectral characteristics are hardly seen with pigment grade titanium oxide. Therefore, the rutile-type titanium oxide aggregated particles used in the present invention have the property of selectively transmitting red light, and it is assumed that such spectral characteristics contribute to the unevenness correction effect and transparency. .
As a suitable example of the rutile type titanium oxide aggregated particles used in the present invention, the average transmittance at 620 to 700 nm when measured by the above method is 45% or more, and the average transmittance at 400 to 480 nm is 37% or less. Things.

Such rutile-type titanium oxide aggregated particles can be obtained, for example, by the methods described in JP2008-56535A and JP2010-24189A. Specifically, it is as follows.
The method for producing the rutile-type titanium oxide aggregated particles used in the present invention is obtained by adding hydrochloric acid to orthotitanic acid obtained by alkali neutralization of a titanyl sulfate solution at a temperature of 10 ° C. or lower at a temperature of 10 ° C. or lower. After the acid is completely dissolved, it is obtained by heating to perform hydrolysis. The TiO ₂ concentration at that time is 50 to 140 g / L, preferably 70 to 120 g / L, and the hydrochloric acid concentration is 70 to 170 g / L, preferably 90 to 160 g / L. Moreover, the temperature of a hydrolysis is 25-60 degreeC, Preferably it is 30-55 degreeC.

  The rutile-type titanium oxide aggregated particle of the present invention is a solution obtained by dissolving, in addition to orthotitanic acid, a titanium tetrachloride solution or an alkali salt of titanic acid treated with alkali at a temperature at which hydrolysis does not occur with hydrochloric acid. It can also be obtained by performing hydrolysis using.

  The rutile-type titanium oxide aggregated particles have aluminum, silicon, zinc, titanium, zirconium, iron, cerium on the surface of the aggregated particles in order to improve dispersion stability and durability in the dispersion medium when manufacturing cosmetics. In addition, a metal-containing oxide or oxide such as tin can be coated, but the metal salt used for this is not limited in any way. Furthermore, it is useful to subject these titanium oxides to a water repellency and / or oil repellency treatment before blending them into cosmetics. Water repellency and / or oil repellency treatment is performed on the surface of rutile-type titanium oxide aggregated particles by using a silicone compound such as dimethylpolysiloxane or methylhydrogenpolysiloxane, a coupling agent such as silane, aluminum, titanium or zirconium. It is carried out by treating fluorine compounds such as perfluoroalkyl phosphate compounds, hydrocarbons, lecithin, amino acids, polyethylene, wax, metal soap and the like.

  As a rutile type titanium oxide aggregated particle used in the present invention, as a commercial product, silky touch titanium oxide ST-710 (manufactured by Titanium Industry Co., Ltd., average particle size 0.3 μm) can be mentioned.

  In the powder cosmetic of the present invention, the rutile-type titanium oxide aggregated particles are preferably 1% by mass or more, more preferably 3% by mass or more, based on the total amount of the cosmetic. If the amount is too small, the effect may not be sufficiently obtained. On the other hand, even if the rutile-type titanium oxide aggregated particles are added excessively, a powdery appearance appears, and an increase in the effect commensurate with the powdery appearance cannot be expected. Moreover, when it is set as solid powder cosmetics, there exists a tendency for impact resistance to fall. Therefore, the rutile-type titanium oxide aggregated particles are preferably 20% by mass or less, more preferably 15% by mass or less, based on the total amount of the cosmetic.

Hydrophilic silica fine powder-coated polyurethane particles In order to maintain the unevenness correction effect and transparency of the rutile-type titanium oxide aggregated particles, it is preferable to blend hydrophilic silica fine powder-coated polyurethane particles. Further, such polyurethane particles do not reduce the impact resistance in the case of a solid powder cosmetic.

  The hydrophilic silica fine powder-coated polyurethane particles used in the present invention have a polyurethane particle main body surface coated with a hydrophilic silica fine powder group, and the polyurethane particle main body includes a polyisocyanate component and a polyol component containing polytetramethylene glycol. The isocyanate-terminated urethane prepolymer obtained by the above reaction is three-dimensionally polymerized with a trifunctional or higher polyfunctional amine.

The hydrophilic silica fine powder is a fine powder mainly composed of SiO ₂ and having substantially no hydrophobic group on the surface thereof. Such hydrophilic silica fine powder is conventionally known, for example, Aerosil 200, 200V, 200CF, 200FAD, 300, 300CF, 380, 50, 90G, 130, OX50, MOX80, sold by Nippon Aerosil Co., Ltd. MOX170, COK84, etc. are known.
The average primary particle diameter of the polyurethane particles is about 1 to 50 μm, and the average particle diameter of the hydrophilic silica fine powder group is 5 to 40 nm.

  As the polyisocyanate component used for producing the isocyanate-terminated urethane prepolymer, any conventionally known compound can be used as long as it has two or more isocyanate groups in the molecule. Preferable examples include an alicyclic polyisocyanate compound or an aliphatic polyisocyanate compound, and specific examples include isophorone diisocyanate, 1,6-hexamethylene diisocyanate, hydrogenated MDI, and the like.

  Polytetramethylene glycol is used as the polyol component used for the production of the isocyanate-terminated urethane prepolymer. Of course, other polyol components may be appropriately mixed together with polytetramethylene glycol. Any other polyol component may be used as long as it is conventionally used for producing polyurethane. Although the number average molecular weight of polytetramethylene glycol is a matter that can be determined as appropriate, in the present invention, those having a number average molecular weight of 650 to 3000 are generally used.

  Examples of the trifunctional or higher polyfunctional amine used for producing the isocyanate-terminated urethane prepolymer include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and 3,3′-diaminodipropylamine.

The polyurethane particles used in the present invention can be obtained by the methods described in, for example, JP 2010-1332779 A and JP 2010-163389 A using the above-described raw materials. In particular,
Reacting a polyisocyanate component with a polyol component containing polytetramethylene glycol to obtain an isocyanate-terminated urethane prepolymer;
Adding and stirring the isocyanate-terminated urethane prepolymer to an aqueous solution in which a dispersant is dissolved to obtain an oil-in-water emulsion,
After adding a trifunctional or higher polyfunctional amine to the oil-in-water emulsion and three-dimensionally polymerizing the isocyanate-terminated urethane prepolymer constituting the oil droplet group to obtain a polyurethane sphere group Removing the dispersant from the water to obtain an aqueous polyurethane sphere dispersion;
Mixing the polyurethane sphere aqueous dispersion with a silica aqueous dispersion in which hydrophilic silica fine powders are dispersed in water to obtain a mixed aqueous dispersion;
The mixed aqueous dispersion is sprayed into a high-temperature atmosphere using a spray dryer to evaporate water, thereby forming a polyurethane particle body group with the polyurethane sphere group, and the hydrophilic surface on each polyurethane particle body surface. A step of coating the group of fine silica particles,
Through the process, a polyurethane particle group can be obtained.
Here, in the present invention, the polyurethane particles mean one particle in which the surface of the polyurethane particle body is coated with a hydrophilic silica fine powder group. The polyurethane particle group means a large number of polyurethane particles, that is, an aggregate of polyurethane particles. That is, “group” is used in the meaning of “s” added to the end of an English noun to indicate a plurality.

  In this way, when the polyurethane spheres are sprayed and dried, the polyurethane spheres remain as one piece, or two or more of them join together to form the polyurethane particle body. For example, when the polyurethane sphere is soft or the surface thereof is sticky, two or more of them are easily bonded to form a polyurethane particle body. On the other hand, if the polyurethane sphere is hard, the polyurethane particle body tends to remain as it is.

  As described above, when the mixed aqueous dispersion is spray-dried, the polyurethane spheres become the polyurethane particle main body, and the surface of the particle main body is coated with the hydrophilic silica fine powder group. The hydrophilic silica fine powder group may simply cover the surface of the particle main body, or may cover the part of the hydrophilic silica fine powder embedded in the particle main body. The latter state occurs when the polyurethane sphere or the polyurethane particle body is relatively soft. The average particle size of the polyurethane particles obtained is the average particle size of the polyurethane spheres produced when preparing the mixed aqueous dispersion, the property that the polyurethane particles are soft or the surface is sticky, the conditions of spray drying, etc. It is a matter that can be appropriately determined by adjusting. In the present invention, the average particle size of the polyurethane particle group is generally about 1 to 50 μm. In addition, in this invention, the average particle diameter of a polyurethane particle group is an average primary particle diameter, and is measured by the following methods. That is, the primary particle diameter of each of 100 particles is measured with an optical microscope, an electron microscope, or the like, and the number average is obtained. At this time, when two or several polyurethane particles are aggregated, the aggregation is released, and the primary particle size of each dispersed particle is measured.

  The hydrophilic silica fine powder-coated polyurethane particles are preferably 0.5% by mass or more, more preferably 1% by mass or more in the cosmetic. If the amount is too small, the unevenness correction effect and the sustainability of transparency may not be sufficiently obtained. On the other hand, excessive blending of hydrophilic silica fine powder-coated polyurethane particles does not provide a corresponding improvement in the effect, resulting in a powdery appearance or an impact on the impact resistance of a solid powder cosmetic. May affect. Therefore, the hydrophilic silica fine powder-coated polyurethane particles are preferably 15% by mass or less, more preferably 10% by mass or less in the cosmetic.

Other Powder Components In the present invention, powder components other than those described above can be used. Such a powder component is not particularly limited as long as it is generally used for powder cosmetics. For example, talc, kaolin, sericite, muscovite, phlogopite, synthetic mica, saucite, biotite, calcined talc, calcined sericite, calcined muscovite, calcined phlogopite, permiculite, magnesium carbonate, calcium carbonate , Aluminum silicate, Barium silicate, Calcium silicate, Magnesium silicate, Strontium silicate, Tungsten metal salt, Magnesium, Silica, Zeolite, Barium sulfate, Calcined calcium sulfate (calcined gypsum), Calcium phosphate, Fluorine apatite, Hydroxyapatite , Ceramic powder, metal soap (eg, zinc myristate, calcium palmitate, aluminum stearate, etc.), boron nitride, photochromic titanium oxide (titanium dioxide sintered with iron oxide), reduced zinc white; organic powder (eg, , Silico Elastomer powder, silicone powder, silicone resin-coated silicone elastomer powder, polyamide resin powder (nylon powder), polyethylene powder, polymethyl methacrylate powder, polystyrene powder, copolymer resin powder of styrene and acrylic acid, benzoguanamine resin powder, poly Inorganic white pigments (eg, titanium dioxide, zinc oxide, etc.); Inorganic red pigments (eg, iron oxide (Bengara), iron titanate, etc.); Inorganic brown pigments (eg, Inorganic yellow pigments (for example, yellow iron oxide, loess); inorganic black pigments (for example, black iron oxide, low-order titanium oxide); inorganic purple pigments (for example, manganese violet) , Cobalt violet, etc.); inorganic green pigments (eg chromium oxide, chromium hydroxide, tita) Inorganic blue pigments (for example, ultramarine blue, bitumen, etc.); Pearl pigments (for example, bismuth oxychloride, fish scale foil, titanium mica, iron oxide-coated mica titanium, low-order titanium oxide-coated mica titanium, photochromic properties) Titanium mica having, talc, glass, synthetic fluorine phlogopite mica, silica, bismuth oxychloride, etc. as a substrate, in addition to titanium oxide as a coating, low-order titanium oxide, colored titanium oxide, iron oxide, Alumina, silica, zirconia, zinc oxide, cobalt oxide, aluminum coated, functional pearl pigment coated with resin particles on pearl pigment surface (Japanese Patent Laid-Open No. 11-92688), pearl pigment surface aluminum hydroxide Particle coated (JP 2002-146238), coated with zinc oxide particles on the pearl pigment surface Covered (JP 2003-261421), pearl pigment surface coated with barium sulfate particles (JP 2003-61229), etc .; metal powder pigment (eg, aluminum powder, copper powder, etc.); zirconium, barium or Organic pigments such as aluminum lake (for example, red 201, red 202, red 204, red 205, red 220, red 226, red 228, red 405, orange 203, orange 204, yellow Organic pigments such as 205, yellow 401, and blue 404, red 3, red 104, red 106, red 227, red 230, red 401, red 505, orange 205, yellow 4 No. 5, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3 and Blue No. 1); natural pigments (for example, chlorophyll) β- carotene), and the like. In addition, the said powder component can be used 1 type or in mixture of 2 or more types.

In the present invention, the powder component may be a surface-untreated one, or is subjected to a surface treatment with silicone, fluorine compound, silane coupling agent, Teflon (registered trademark), fatty acid, fatty acid soap, lauroyl lysine or the like. May be used.
In the present invention, fluorine compound-treated powder and elastic powder (for example, silicone rubber powder, silicone resin powder, silicone resin-coated silicone rubber powder, polyurethane powder, etc.) can also be included as a powder component.

  In the powder cosmetic of the present invention, the powder component is used in an amount sufficient to make a powder cosmetic. Usually, a powder component is 65 mass% or more in cosmetics, Preferably it is 80 mass% or more. On the other hand, the compounding quantity of a powder component becomes like this. Preferably it is 97 mass% or less, More preferably, it is 93 mass% or less. If the amount of the powder component is too large, it will be difficult to obtain a product that is sufficiently satisfactory in terms of practical properties such as adhesion to the skin and moist feeling, or impact resistance when used as a solid powder cosmetic. Sometimes.

Oily component The oily component used in the present invention is not particularly limited as long as it is generally used in powder cosmetics. For example, avocado oil, camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, flaxseed oil, safflower oil, Natural vegetable oils such as cottonseed oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, etc .; triglycerin, trioctanoic acid glycerin, triisopalmitic acid glycerin Liquid oils such as cocoa butter, palm oil, horse fat, hydrogenated palm oil, palm oil, beef tallow, sheep fat, hydrogenated beef tallow, palm kernel oil, pork fat, beef bone fat, owl kernel oil, hydrogenated oil, cow leg fat Animal and vegetable liquid oils such as molasses, hydrogenated castor oil, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, lobster wax, whale wax, montanro , Nukarou, lanolin, kapok wax, lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojo wax, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, POE cholesterol ether, lanolin Waxes such as fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether; hydrocarbon oils such as liquid paraffin, ozokerite, squalene, pristane, paraffin, ceresin, squalene, petrolatum, microcrystalline wax; isopropyl myristate, cetyl octanoate, myristine Octyldodecyl acid, isopropyl palmitate, butyl stearate, hexyl laurate, myris Myristylate, decyl oleate, hexyldecyl dimethyloctanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearylate, ethylene glycol di-2-ethylhexylate, dipentaerythritol Fatty acid ester, N-alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, tetra Pentaneerythritol-2-ethylhexylate, glycerin tri-2-ethylhexylate, trimethylolpropane triisostearate, cetyl 2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, tri-2-heptylundecanoic acid glyceride, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylunpalmitate Decyl, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, palmitic Synthetic ester oils such as 2-hexyldecyl acid, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate; Polysiloxane, methylphenyl polysiloxane, other such methylhydrogenpolysiloxane decamethyl polysiloxane, dodecamethyl polysiloxane, tetramethyl hydrogen silicone oils polysiloxane, fluorocarbon resins, and acrylic resins. In addition, the said oil component can be used 1 type or in mixture of 2 or more types.

In addition, a highly viscous oil having a viscosity of 100 to 50,000 mPa · s at 25 ° C., for example, hydrogenated polyisobutene, glyceryl triisostearate, diisostearyl malate, silicone oil such as dimethylpolysiloxane and diphenyldimethicone, castor oil, and dimer Dimer acids and dimer diol derivatives such as dilinoleic acid di (isostearyl phytosteryl), diisostearic acid dimer dilinoleyl and dimer dilinoleic acid dimer dilinoleyl can also be used.
In powder cosmetics, non-volatile components are mainly used as oil components.

  In this invention, it is preferable that the compounding quantity of an oil-based component is 3 mass% or more in cosmetics, Furthermore, it is 7 mass% or more. If the amount of the oil component is too small, it will be difficult to obtain a product that is sufficiently satisfactory in terms of practical properties such as adhesion to the skin and moist feeling, or impact resistance when it is used as a solid powder cosmetic. Sometimes. On the other hand, the compounding quantity of an oil-based component is 20 mass% or less in cosmetics. If the blending amount of the oil component is too large, the unevenness correction effect and transparency due to the rutile-type titanium oxide aggregated particles may be insufficient. This is presumably because if the amount of the non-volatile oily component is too large, the agglomeration between the blended powders becomes remarkable and the optical characteristics are not sufficiently exhibited.

Production method In the present invention, by incorporating the rutile-type titanium oxide aggregated particles, an excellent unevenness correction effect and transparency can be obtained, but the impact resistance may be remarkably lowered when a solid powder cosmetic is used. . In order to suppress such a decrease in impact resistance, mixing of the powder component and the oil component is performed using a specific rotary blade-facing mixing device, that is, a first rotary blade and a second rotary blade provided with a plurality of blades. Are arranged in the mixing chamber so as to face each other on the same axis in the substantially horizontal direction, and the raw material is supplied from the inlet on the first rotary blade side, and the first rotary blade and the second rotary blade It is preferable to use a rotary blade-facing mixing device that mixes raw materials by rotating the rotary blades in opposite directions and discharges the mixed raw material from the discharge port on the second rotary blade side. When producing solid powder cosmetics such as foundations, the mixture of the powder component and oil component obtained as described above is filled in, for example, a metal or resin middle dish container, and solidified by dry molding. Should be done. In addition, as a solidification method, a conventionally well-known dry press molding etc. can be used, for example.
Moreover, the unevenness correction effect and transparency of the powder cosmetic are also improved by using the specific rotary blade opposed mixing device as described above.
Such a method is described in, for example, Japanese Patent Application Laid-Open No. 2009-167181.

  Moreover, the rotor blade type mixing device used in the present invention is disclosed in, for example, JP 2002-79183 A, JP 2003-1127 A, JP 2003-10712 A, JP 2003-71307 A, and the like. The described grinding device can be used as the mixing device of the present invention. An example of a commercially available apparatus is a cyclone mill (manufactured by Flotech).

FIG. 2 shows a schematic diagram of an example of a rotary blade facing type mixing apparatus used in the present invention. In addition, the rotary blade facing type mixing apparatus used in the present invention is not limited to this.
In the mixing device 10 of the rotating blade opposed type, the first rotating blade 14 and the second rotating blade 15 that are driven to rotate by the motors 12 and 13 are individually rotated on the same axis in the horizontal direction. The raw material inlet 16 is communicated with the first rotary blade 14 side of the mixing chamber 11 and the discharge port 17 is communicated with the second rotary blade 15 side of the mixing chamber 11. Is provided. Further, a raw material supply device 20 is provided at the upper portion of the rotary blade facing mixing device 10 inlet 16, and a collection device 30 (and a recovery container 32) and a suction device 40 are connected to the tip of the discharge port 17. Yes.

  In the rotary blade facing type mixing apparatus 10, the first rotary blade 14 and the second rotary blade 15 that are arranged to face each other on the same axis rotate integrally with the rotary shafts of the motors 12 and 13. In the rotary blade-facing mixing device 10, the target mixture by the raw material supply device 20 in a state where the first rotary blade 14 and the second rotary blade 15 are rotated at high speeds in opposite directions by the motors 12 and 13. Raw materials are charged from the raw material inlet 16. The mixture raw material charged into the rotary blade-facing mixing device 10 violently collides with the first rotary blade 14, the second rotary blade 15, or the inner wall surface of the mixing chamber 11, and further, the raw material components collide with each other. , Uniformly mixed and dispersed. As a result, a mixture in which the oil component is uniformly coated on the surface of the powder particle is obtained without causing aggregation of the powder component.

  In addition, since the first rotary blade 14 and the second rotary blade 15 facing each other can be used by rotating in opposite directions, a greater shear stress can be generated than when rotating in the same direction. Aggregation of powder components hardly occurs and a uniform mixture is easily obtained. In addition, the rotational speed of the 1st rotary blade 14 and the 2nd rotary blade 15 can be suitably adjusted, for example between 1000-10000 rpm, Preferably it is 3000-8000 rpm.

  In the first rotary blade 14 and the second rotary blade 15, a plurality of blades are provided radially around the bosses attached to the rotary shafts of the motors 12 and 13, respectively. Usually, there are about 2 to 16 blades for one rotor blade. In addition, in the 1st rotary blade 14 and the 2nd rotary blade 15, the shape of a rotary blade, the number of blades, etc. may mutually be same or different.

  The target mixture mixed in the mixing chamber 11 is discharged from the discharge port 17. A collection device 30 and a suction device 40 are connected to the tip of the discharge port 17. By the operation of the suction device 40, the target mixture is continuously discharged from the discharge port 17, and the discharged target mixture is collected in the collection device 30 and collected in the collection container 32. The operating conditions of the suction device 40 can be appropriately adjusted according to the type and amount of the control mixture, the rotational speed of the rotor blades, and the like. In addition, the mixture can be continuously produced by continuously feeding the mixture raw material by the raw material supply device 20 in a state where the suction device 40 and the collection device 30 are operated.

  The powder component and the oil component may be added individually or simultaneously to the rotating blade facing mixing device, but in normal cases, premixing should be performed with a simple stirring device such as a Henschel mixer or a Nauter mixer. Is preferred. If it is put into a rotary blade facing mixing device without premixing, it may be difficult to control the mixing process, for example, only the light powder component will be discharged first without being sufficiently mixed with the oil component. .

  In the powder cosmetics of the present invention, other components that are usually used in skin external preparations such as cosmetics and pharmaceuticals, for example, anionic surfactants, cationic surfactants, amphoteric interfaces, as long as the effects of the present invention are not impaired. Activators, nonionic surfactants, humectants, water-soluble polymers, thickeners, film agents, UV absorbers, sequestering agents, lower alcohols, polyhydric alcohols, sugars, amino acids, organic amines, polymer emulsions , PH adjusters, skin nutrients, vitamins, antioxidants, antioxidant assistants, fragrances, water and the like can be appropriately blended as necessary.

  The powder cosmetics of the present invention are applied to powdery or solid powder cosmetics such as foundations, body powders, perfume powders, baby powders, pressed powders, deodorant powders, and fountains, and are particularly suitable for uneven foundations. it can.

Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to these examples. The blending amount is expressed in mass% unless otherwise specified.
First, the evaluation method used in this example will be described.

<Practical property evaluation>
Twenty female panelists evaluated the inconspicuousness of the unevenness, transparency, softness, smoothness, and powderiness when the sample was applied to the face. Further, regarding the inconspicuousness of the unevenness and the transparency, the sustainability after 4 hours after the application was also evaluated with reference to the time immediately after the application.
More than 17 respondents say ◎
Answer that 12 to 16 people are good ○
Nine to eleven people answered that they were good △
Answered that 5 to 8 people are good ×
Less than 4 respondents say XX

<Impact resistance evaluation>
Set the sample press-molded in a resin pan in a compact container for cosmetics, and drop the container from a height of 30 cm onto a 20 mm thick iron plate in a horizontal state until the sample is damaged. The impact resistance was evaluated.

Test Example 1 Effects of rutile-type titanium oxide aggregated particles

(Production method)
Add the oil component to the powder component and mix for a certain period of time with a Henschel mixer (Mitsui Miike Chemical), then mix twice with a pulverizer (made by Hosokawa Micron), a hammer-type pulverizer, and dry press mold into a resin pan. A solid powder cosmetic (powder foundation) was obtained.

  As can be seen from Table 1, by incorporating the rutile-type titanium oxide aggregated particles, an unevenness correction effect was high and a natural transparent finish was obtained. In order to obtain such an effect, it is preferable to blend the rutile-type titanium oxide aggregated particles in the cosmetic at 1% by mass or more, and further 3% by mass or more. In addition, since transparency tends to be lowered when the rutile-type titanium oxide aggregated particles are excessively mixed, the rutile-type titanium oxide aggregated particles are preferably 20% by mass or less, more preferably 15% by mass or less in the cosmetic. is there.

  Table 2 shows the results of investigation by replacing the rutile-type titanium oxide aggregated particles with other titanium oxides. As shown in Table 2, unevenness correction effect and transparency could not be obtained with pigment grade titanium oxide or fine particle titanium oxide. Moreover, even if it was a rutile type titanium oxide aggregated particle, sufficient effect was not acquired if the average particle diameter was 0.5 micrometer.

Test Example 2 Oil component

Table 3 shows the results when the blending amount of the oil component is changed. The production was performed in the same manner as in Test Example 1.
As shown in Table 3, when the oil component increased, the unevenness correction effect and transparency of the rutile-type titanium oxide aggregated particles became insufficient. For these reasons, it was considered that the oil component is preferably 20% by mass or less in the cosmetic.

  The reason why the excessive oil component impairs the effect of the present invention is not clear, but if there are many oil components remaining in the decorative coating film, the aggregation between the blended powders becomes significant, and the characteristics of the rutile-type titanium oxide aggregate particles are It is possible that it will not be fully demonstrated.

Test example 3 Impact resistance

  Table 4 shows the results of examining the impact resistance of the powder cosmetics of Table 1. As shown in Table 4, it has been found that, although the unevenness correction effect and the transparency are improved, the impact resistance is remarkably deteriorated as the blending amount of the rutile-type titanium oxide aggregated particles is increased. Therefore, the improvement of impact resistance was examined.

  Table 5 shows that the powder component and the oil component are mixed with a Henschel mixer (manufactured by Mitsui Miike Chemical Co., Ltd.) for a certain period of time, and then a rotary blade-facing mixing device (cyclone mill: manufactured by Flotech; first rotary blade and second rotation It is an evaluation result of a solid powder cosmetic (powder foundation) obtained by mixing twice using a wing rotated in opposite directions and dry press molding into a resin dish. As shown in Table 5, a solid powder cosmetic with high impact resistance is obtained by mixing the powder component and the oil component using a rotary blade-facing mixing device, even if rutile type titanium oxide aggregated particles are blended. It was. In addition, in the powder cosmetic obtained using the rotary blade facing type mixing device, the unevenness correction effect and transparency were improved as compared with the powder cosmetic obtained by the conventional dry manufacturing method.

Test Example 4 Sustainability Furthermore, the unevenness correction effect by the rutile-type titanium oxide aggregated particles and the sustainability of transparency were examined.

As shown in Table 6, it was revealed that when the hydrophilic silica fine powder-coated polyurethane particles were used in combination, the unevenness correction effect and the transparency were maintained by the rutile-type titanium oxide aggregated particles. Furthermore, when applied to the skin, it was excellent in softness and smoothness, had no powderiness, and had a very excellent feeling of use. Moreover, the hydrophilic silica fine powder-coated polyurethane particles did not lower the impact resistance. These effects were not obtained with other polyurethane powders.
On the other hand, the improvement effect of sustainability and feeling of use was low with porous silica. Moreover, although the sustainability improving effect was recognized in the porous PMMA powder, it was inferior to the hydrophilic silica fine powder-coated polyurethane particles in terms of usability. Furthermore, when porous silica or porous PMMA was blended, the impact resistance decreased.
Furthermore, the amount of the hydrophilic silica fine powder-coated polyurethane particles was also examined.

  As shown in Table 7, in order to obtain an unevenness correction effect, a transparency improvement effect, and a usability improvement effect, 0.5 mass% or more of hydrophilic silica fine powder-coated polyurethane particles in the cosmetic, It is preferable to blend 1% by mass or more. On the other hand, if there are too many hydrophilic silica fine powder-coated polyurethane particles, powderyness may be produced, or the impact resistance when a solid powder cosmetic is made may be insufficient. Accordingly, the hydrophilic silica fine powder-coated polyurethane particles are preferably 15% by mass or less, more preferably 10% by mass or less in the cosmetic.

Hereinafter, formulation examples of the powdered solid cosmetic according to the present invention will be shown.
<Prescription Example 1: Foundation>
――――――――――――――――――――――――――――――――――――――
(Ingredient) (mass%)
――――――――――――――――――――――――――――――――――――――
Sericite 10
Synthetic mica remaining decyl trisiloxane zinc carboxylate talc 5
Hydrophilic silica fine powder coated polyurethane particles 5
Spherical silicone powder 3
(Trefill E-506S: manufactured by Toray Dow Corning Co., Ltd.)
Spherical silicone powder 5
(Tospearl 2000B: Toshiba Silicone Co., Ltd.)
Spherical silicone powder 5
(Silicone powder KSP300: manufactured by Shin-Etsu Chemical Co., Ltd.)
Spherical porous silica 2
(Sunsphere L-51: manufactured by Asahi Glass Co., Ltd.)
Silicone-treated titanium oxide 8
Rutile-type titanium oxide spherical aggregated particles (average particle size of about 0.3 μm) 10
Red interference pearl pigment 1
Zinc flower 2
Silicone treated bengara 0.8
Silicone-treated yellow iron oxide 2
Silicone-treated black iron oxide 0.1
Spherical nylon powder 4
1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (5%)
/ Acrylic silicone copolymer 2% treated talc 10
1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane 5%
/ Acrylic silicone copolymer 2% treated barium sulfate 10
Dimethylpolysiloxane (5 mPa · s) 3
Dimethylpolysiloxane (5000 mPa · s) 2
Squalane 3
Vaseline 1
Dimer dilinoleic acid di (phytosteryl behenyl) 2
Sorbitan sesquiisostearate 0.2
Chlorphenesine Appropriate amount Antioxidant Appropriate amount Fragrance Appropriate amount ――――――――――――――――――――――――――――――――――――――

(Manufacturing method)
After adding an oily component to the powder component in the formulation and mixing for a certain period of time with a Henschel mixer (Mitsui Miike Chemical Co., Ltd.), a rotating blade facing mixing device (Cyclone Mill: manufactured by Flotech; first rotating blade and second rotating blade) The rotary blades were rotated twice in opposite directions and mixed twice, and then dry press molded into a resin pan.

<Prescription Example 2: White powder (pressed powder)>
――――――――――――――――――――――――――――――――――――――
(Ingredient) (mass%)
――――――――――――――――――――――――――――――――――――――
Decyltrisiloxane zinc carbonate coated talc 10
Synthetic Mica Residual Silylated Silica 5
Zinc flower 5
Red interference pearl pigment 3
Rutile-type titanium oxide spherical aggregated particles (average particle size of about 0.3 μm) 10
Fine particle titanium oxide 3
Hydrophilic silica fine powder coated polyurethane particles 8
Spherical silicone powder 3
(Trefill E-506S: manufactured by Toray Dow Corning Co., Ltd.)
Spherical silicone powder 5
(Tospearl 2000B: Toshiba Silicone Co., Ltd.)
Spherical silicone powder 5
(Silicone powder KSP300: manufactured by Shin-Etsu Chemical Co., Ltd.)
Spherical porous silica 2
(Sunsphere L-51: manufactured by Asahi Glass Co., Ltd.)
1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane
5% treated talc 30
Hydrogenated polyisobutene (20000 mPa · s) 0.5
Diisostearyl malate (2000 mPa · s) 1
Squalane 1
Ester oil 1
Paraben Appropriate amount Antioxidant Appropriate amount Fragrance Appropriate amount ――――――――――――――――――――――――――――――――――――――

(Manufacturing method)
The oil component is added to the powder component in the formulation and mixed for a certain period of time with a Henschel mixer (Mitsui Miike Chemical Co., Ltd.), and then the rotary blade facing mixing device (Cyclone Mill: manufactured by Flotech, Inc .; first rotary blade shown in FIG. And the second rotary blades rotated in opposite directions to each other) and dry-molded into a resin medium dish.

  The powdered solid cosmetics obtained by the above Formulation Examples 1 and 2 are both highly transparent, excellent in unevenness correction effect, and feel in use (powder, color dullness over time, fine particle feeling, moistness, Smoothness, etc.) and excellent impact resistance.

DESCRIPTION OF SYMBOLS 10 Rotary blade opposing type mixing apparatus 11 Mixing chamber 12 Motor 13 Motor 14 1st rotary blade 15 2nd rotary blade 16 Inlet 17 Outlet 20 Raw material supply apparatus 30 Collection apparatus 32 Collection container 40 Suction apparatus

Claims (4)

A powder cosmetic comprising a powder component and an oily component,
As a powder component, 1-20% by mass of rutile-type titanium oxide aggregated particles having an average particle diameter of 0.2 to 0.4 μm and an average coefficient of friction (MIU value) of 0.4 to 0.6 are contained in the cosmetic. And
Containing 3 to 20% by mass of an oily component in the cosmetic,
The mixing of the powder component and the oil component is performed in the mixing chamber in a state in which the first rotary blade and the second rotary blade provided with a plurality of blades face each other on the same axis in the substantially horizontal direction. The raw material is supplied from the inlet on the first rotor blade side, and the raw material is mixed by rotating the first rotor blade and the second rotor blade in directions opposite to each other, from the outlet on the second rotor blade side. A powder cosmetic characterized by being performed by a rotary blade-facing mixing device that discharges the mixed raw material.   2. The cosmetic according to claim 1, further comprising polyurethane particles, wherein the polyurethane particles are coated with a hydrophilic silica fine powder group on the surface of the polyurethane particles, and the polyurethane particles include a polyisocyanate component and polytetramethylene. A powder cosmetic characterized in that an isocyanate-terminated urethane prepolymer obtained by reaction with a polyol component containing glycol is three-dimensionally polymerized with a trifunctional or higher polyfunctional amine.   The cosmetic according to claim 1 or 2, wherein the cosmetic is solid. A foundation comprising the powder cosmetic according to any one of claims 1 to 3.

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