JP4777872B2 - Cosmetics - Google Patents

Description

  The present invention relates to a cosmetic that makes skin color unevenness and skin unevenness inconspicuous.

  Conventionally, attempts have been made to use the optical properties of extender pigments as cosmetics that make it difficult to see the unevenness of the skin due to wrinkles, fine lines, pores, and the like. For example, Patent Document 1 proposes a cosmetic in which a powder obtained by coating the surface of a pigment with an inorganic silicon compound is used as a diffuse reflection type powder. In Patent Document 2, an attempt is made to make the unevenness of the skin such as wrinkles and pores difficult to see by combining spherical powders having different particle diameters. On the other hand, Patent Documents 3 and 4 propose composite powders in which white pigments are dispersed in polymer particles.

However, none of the cosmetics was effective enough to make the unevenness of the skin inconspicuous. In addition, in order to achieve both uneven color covering power and uneven surface covering power, when blended with a high concentration of powder, the feeling of use is heavy and does not adhere uniformly on the skin, and the finish is thick and powdery, making the unevenness inconspicuous However, there was a problem that it did not last for a long time, and none of them was satisfactory.
JP 60-228406 A JP 10-338616 A JP 2003-192538 A JP 2004-323473 A

  An object of the present invention is to provide a cosmetic that has good adhesion to the skin, spreads well, has high unevenness covering power and uneven skin covering power, has a uniform and natural finish, and has little color change over time. And

  By using a combination of three different polymer powders, the present inventors have good adhesion to the skin and spread, high color unevenness covering power and skin unevenness and pore covering power, uniform and natural It has been found that a cosmetic can be obtained with a finish and less color change with time.

The present invention includes the following components (A), (B) and (C):
(A) (a) a white inorganic pigment, (b) a red inorganic pigment, and (c) a yellow inorganic pigment, and a polymer powder having an average particle size of 1 to 5 μm,
(B) (a) a white inorganic pigment, (b) a red inorganic pigment, and (c) a yellow inorganic pigment, and a polymer powder having an average particle size of 8 to 15 μm,
(C) To provide a cosmetic containing a polymer powder having an average particle diameter of 1 to 15 μm without containing a pigment.

  The cosmetic of the present invention makes the skin color unevenness and skin unevenness inconspicuous, a transparent and natural finish is obtained, there is little unevenness at the time of application, there are few color changes over time, and it has excellent usability Is.

  The polymer powders of components (A) and (B) used in the present invention contain (a) a white inorganic pigment, (b) a red inorganic pigment, and (c) a yellow inorganic pigment in a polymer as a base material. Is. Preferably, (a) a white inorganic pigment, (b) a red inorganic pigment, (c) a yellow inorganic pigment is present dispersed in the polymer particles, or (a) a white inorganic pigment, ( b) Red inorganic pigments, (c) Yellow inorganic pigments, etc. are present, and in particular, (a) white inorganic pigment, (b) red inorganic pigment, (c) yellow inorganic pigment are uniform in the polymer particles. Those dispersed in are preferable.

  (a) Examples of white inorganic pigments include metal oxides such as aluminum oxide, calcium oxide, magnesium oxide, zinc oxide, zirconium oxide, titanium dioxide (rutile type, anatase type, etc.); zinc oxide / titanium dioxide composite oxide Composite metal oxides such as aluminum oxide / magnesium oxide composite oxide, calcium oxide / zirconium oxide composite oxide; sulfates such as barium sulfate; carbonates such as calcium carbonate, and the like. It can use individually or in mixture of 2 or more types. Of these, metal oxides such as titanium dioxide, aluminum oxide, zinc oxide, and zirconium oxide, and zinc oxide / titanium dioxide composite oxide are preferable from the viewpoint of stability in cosmetics, and titanium dioxide is particularly preferable.

Examples of the (b) red inorganic pigment include Bengala, iron oxide / titanium oxide sintered product, cadmium red, and molybdenum red. Bengala is preferable.
Examples of the (c) yellow inorganic pigment include yellow iron oxide, cerium oxide, bismuth vanadium yellow, yellow lead, cadmium yellow and the like, and yellow iron oxide is preferable.

  The average particle diameters of (a) white inorganic pigment, (b) red inorganic pigment, and (c) yellow inorganic pigment are each 0.01 to 0.5 μm from the viewpoint of being uniformly dispersed in the polymer powder. preferable.

  (a) white inorganic pigment, (b) red inorganic pigment, (c) yellow inorganic pigment in the polymer powder mass ratio is from the viewpoint of cutting the short wavelength side of the light and making the pores inconspicuous. 70 to 99: 0.1 to 10: 0.1 to 20, particularly 70 to 97: 1 to 10: 2 to 20, more preferably 80 to 97: 1 to 5: 2 to 15, and 90 to 97: 1 to 3: 2-7 are more preferable.

  The inorganic pigment is preferably subjected to a surface treatment such as a silicone treatment for imparting water repellency and a fluorine treatment for imparting water and oil repellency. An inorganic pigment subjected to silicone treatment is excellent in dispersibility in a general organic solvent, and an inorganic pigment subjected to fluorine treatment is excellent in dispersibility in a fluorine-based solvent.

The total content of the inorganic pigments in the polymer powders of the components (A) and (B) is 5 to 40% by mass, particularly 10 to 20% by mass. It is preferable in terms of balance.
In addition to the above (a), (b), and (c), the inorganic pigment can contain a black inorganic pigment (black iron oxide or the like), a ceramic pigment (ceramic pigment), or the like.

  On the other hand, the polymer used as a base material is not particularly limited as long as it shows hydrophobic properties and is usually used in cosmetics. For example, (meth) acrylic resins such as polymethyl methacrylate, nylon , Polyester, polyethylene, polystyrene, polyurethane, silicone resin, and the like, and cross-linked polymers such as lauryl (meth) acrylate-ethylene glycol di (meth) acrylate copolymer, isostearyl acrylate-divinylbenzene copolymer, and cross-linked polyurethane. Among these polymers, the polymer is transparent or translucent, easy to manufacture, and excellent in particle strength and solvent resistance, preferably a crosslinked polymer, lauryl (meth) acrylate-ethylene glycol Di (meth) acrylate copolymers are particularly preferred.

  The method of encapsulating the inorganic pigment in the polymer can be appropriately selected depending on the type of polymer used. For example, when the polymer type is nylon resin, paraffin or the like and cyclic lactam are mixed, heated and dissolved, and the resulting mixture is mixed with a desired amount of inorganic pigment (components (a), (b), (c )) Is added. While stirring this, a polymerization accelerator such as phosphorus trichloride is added to perform alkali polymerization to obtain particles. Further, the particles are separated by filtration, and the obtained particles are washed with an organic solvent such as isopropyl alcohol, benzene, or water, and then dried.

  Also, for example, when the polymer type is a silicone resin, an aqueous solution of ammonia, amine, etc. and an inorganic pigment (including components (a), (b), (c)) powder are mixed, and the resulting mixture is mixed. Hydrolyzable silane, alkoxysilane, acetoxysilane or the like is mixed to hydrolyze alkoxysilane or the like. Next, a condensation reaction between a hydrolyzate such as alkoxysilane and a hydrolyzate such as alkoxysilane or an unhydrolyzed alkoxysilane is performed to obtain particles. Further, there may be mentioned a method of filtering the particles, washing the obtained particles with water and drying.

  Further, for example, when the polymer type is an acrylic resin, (meth) acrylic acid ester as a monomer and lauroyl peroxide as a polymerization initiator are mixed and dissolved, and a desired amount of inorganic is added to the resulting mixture. Add pigment (including components (a), (b), (c)) and disperse. The obtained dispersion is added to and dispersed in an aqueous polyvinyl alcohol solution and heated with stirring to perform polymerization (suspension polymerization) to obtain particles. Examples include a method of filtering the particles, washing the obtained particles with water and drying.

  Further, the dispersion state of the inorganic pigment in the polymer particles is preferably a high dispersion state, and as a method for controlling the dispersion state, a machine such as a homogenizer, a high-pressure homogenizer, an ultrasonic disperser, an attritor mill, or a ball mill is used. Dispersion method used: low molecular surfactant [for example, anionic surfactant (sodium lauryl sulfate, sodium polyoxyethylene lauryl ether sulfate, etc.), cationic surfactant, nonionic surfactant, etc.], polymeric dispersant Examples thereof include a dispersion method using [for example, starch, polyvinyl alcohol, carboxymethylcellulose, methylpolysiloxane and the like].

  The polymer powder of component (C) is produced in the same manner as components (A) and (B) except that it does not contain a pigment.

The polymer powder of component (A) has an average particle size of 1 to 5 μm, preferably 3 to 5 μm, and the polymer powder of component (B) has an average particle size of 8 to 15 μm, preferably 8 to 10 μm. The polymer powder of the component (C) has an average particle diameter of 1 to 15 μm, preferably 3 to 10 μm.
In the present invention, the average particle diameter means a volume-based average particle diameter measured using ethanol as a solvent and using a laser diffraction particle size distribution analyzer. The particle diameter of the pigment in the polymer powder may be measured by observation with an electron microscope.

  The polymer powder may have any shape such as a spherical shape, a spindle shape, a rod shape, a plate shape, and an indefinite shape, and a spherical shape and a spindle shape are preferable from the viewpoint of excellent light scattering effect and usability. The “spherical shape” does not need to be a true sphere, for example, a true sphere; a substantially spherical shape; a spheroid that exhibits a property of suppressing regular reflection and / or irregular reflection; Something.

  The polymer powder of the present invention has a total transmittance of 40% or more and less than 80%, particularly 50% or more and less than 80%, from the viewpoint of making the skin color unevenness, skin irregularities and pores inconspicuous. The haze value is preferably 45 or more and less than 100, and particularly preferably 60 or more and less than 100. The total transmittance and haze value were measured by applying 0.4 g of powder and 1.6 g of amino-modified silicone (SF8417, manufactured by Toray Dow Corning) well onto a glass plate to obtain a sample. -Meter HM-150 (manufactured by Murakami Color Research Laboratory). For the measurement, light having a peak at a wavelength of 550 nm and 8 ° field light are used.

The polymer powder can be used as it is, but it can also be used after its surface has been subjected to a hydrophobizing treatment with a commonly used hydrophobizing agent.
The hydrophobizing agent is not particularly limited as long as it is usually used. For example, silicone oil such as hydrogen organopolysiloxane, fatty acid metal salt, alkyl phosphoric acid, alkali metal salt of alkyl phosphoric acid or amine salt, Examples thereof include N-monoaliphatic acyl basic amino acids having 8 to 22 carbon atoms, phosphate esters having a perfluoroalkyl group, and the like, each of which can be used alone or in admixture of two or more. Of the hydrophobizing agents, silicone oil and phosphate ester having a perfluoroalkyl group are particularly preferable.

The component (A) polymer powder is preferably contained in the total composition in an amount of 0.01 to 50% by mass, particularly 0.1 to 25% by mass. The component (B) polymer powder is preferably included in the total composition. It is preferable to contain 0.01-50 mass%, especially 0.1-25 mass%, and the polymer powder of a component (C) is 0.01-50 mass% in the whole composition, especially 0.1-25. It is preferable to contain by mass. Within these ranges, the feeling in use is good and preferable.
Further, the mass ratio of the components (A), (B) and (C) is (A) :( B) :( C) = 1 to 10: 1 to 10: 1 to 10 so that the color unevenness is hidden. It is preferable in terms of skin unevenness and pore concealment, and ease of application.

  The cosmetic of the present invention can further contain a plate-like powder, and can impart a moist feeling and a smooth feeling upon application to the dry and dry feeling of the spherical powder.

  The plate-like powder has an aspect ratio (hereinafter, simply referred to as “aspect ratio”) of the major axis and thickness of the orthographic projection surface of the plate-like surface of about 3 to 100. It adheres evenly over the skin groove. Suitable plate-like particles preferably have an average particle diameter of 1 to 20 μm, particularly 2 to 9 μm. In addition, if the average particle size of the plate-like powder is within this range, it expresses a “blurring effect” that blurs the boundary between pores, fine lines, etc. and the skin mound, making it difficult to see, and in combination with spherical powder The effect is also improved.

  Specific examples of such plate-like powders include, for example, barium sulfate, talc, mica, kaolin, sericite, gericite, barium ferrite, boron nitride, zeolite, muscovite, synthetic mica, phlogopite, saucite, biotite. , Lithia mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungstate, hydroxyapatite, hydrous silicic acid, anhydrous silicic acid, magnesium oxide, bentonite, ceramic powder And inorganic powders such as aluminum hydroxide, and barium sulfate, talc, and mica are preferable.

  Such a plate-like powder is contained in an amount of 0.1 to 30% by mass, particularly 0.5 to 10% by mass in the total composition, and it is difficult to see the difficulty in the form such as conspicuous pores and fine lines. It is excellent in the effect to do and a feeling of use is also favorable and preferable.

The cosmetic of the present invention can contain components used in ordinary cosmetics as other components, if necessary. Examples of such components include solid and semi-solid oily components such as petroleum jelly, lanolin, ceresin, microcrystalline wax, higher fatty acids, higher alcohols; olive oil, jojoba oil, castor oil, squalane, liquid paraffin, ester oil, diglyceride, Liquid oils such as triglycerides; Silicone oils such as methylpolysiloxane; Fluorine oils such as perfluoropolyether and fluorine-modified silicone; Water-soluble and / or oil-soluble polymers; Water; Mica, talc, sericite, barium sulfate, etc. Extender pigments; organic coloring pigments such as red 226 and yellow 401; antiseptics, antioxidants, thickeners, fragrances, UV absorbers, UV screening agents, bactericides, antiperspirants, moisturizers, etc. .
The content of these components varies depending on the type, but can be generally used within the range in which the object and effect of the present invention are not impaired.

  The cosmetic of the present invention can be produced according to a conventional method using each of the above components, and is a powder solid type, a highly oil-containing powder solid type, an oil dispersion type, a water dispersion type, a water-in-oil emulsion, and an oil-in-water emulsion. It can be set as arbitrary dosage forms.

  The cosmetics of the present invention can be made into makeup cosmetics such as liquid foundations, emulsified liquid foundations, oily foundations, powder foundations, lipsticks, eye shadows, blushers, etc .; medicinal cosmetics such as sunscreen emulsions, etc. Suitable as a liquid foundation and an emulsified liquid foundation.

Production Example 1 (Production of polymer powder)
In a 1300 mL beaker, 56 g of lauryl methacrylate, 19 g of ethylene glycol dimethacrylate and 1.5 g of lauroyl peroxide were charged to obtain a solution. In addition, titanium oxide with an average particle size of 0.25 μm (CR-50, manufactured by Ishihara Sangyo Co., Ltd.), Bengala with an average particle size of 0.38 μm (Bengara Cloisonne, manufactured by Morishita Bengala), average particle size of 0.07 × 0.7 μm Yellow iron oxide (for needle shape) (Yellow LLXLO, manufactured by Titanium Industry Co., Ltd.) was mixed in the ratio shown in Table 1, and water repellent treatment using methylhydrogenpolysiloxane (2% with respect to inorganic powder) )did. Next, the obtained solution and the water-repellent-treated inorganic pigment were mixed and dispersed so as to have the inclusion rate shown in Table 1 to obtain a dispersion. To this dispersion was added 750 g of a 1% by weight polyvinyl alcohol (GOHSENOL GH-17, manufactured by Nippon Synthetic Chemical Industry) aqueous solution and dispersed using an ultrasonic disperser (the particle size can be controlled by time and strength). The obtained dispersion was charged into a 1000 mL separable flask, and then the gas phase in the separable flask was purged with nitrogen. Next, while stirring the dispersion at 150 r / min, polymerization was carried out at 75 ° C. for 8 hours under a nitrogen atmosphere. After completion of the polymerization, the obtained product was filtered to collect a solid, washed with water, and then dried under reduced pressure to obtain 120 g of polymer powder having an average particle size shown in Table 1.
About the obtained polymer powder, the transmittance | permeability and the haze value were measured. The results are also shown in Table 1.

(Measuring method)
The total transmittance and haze value of each powder were measured using Haze-meter HM-150 (Murakami Color Research Laboratory Co., Ltd.). For the measurement, light having a peak at a wavelength of 550 nm was used.
The sample was prepared as follows. 0.4 g of the powder is weighed and kneaded into 1.6 g of amino-modified silicone (SF8417, manufactured by Toray Dow Corning) and applied to a glass plate. The kneading was performed at 100 revolutions using a Hoover Marler (kneader: YOSHIMITSU, Hoover Marler), after scraping once, and further kneading at 100 revolutions. The glass plate was coated using a 0.025 mm coater (manufactured by YOSHIMITSU, coater).

  The haze value (H) is calculated by multiplying the value obtained by dividing the diffuse transmittance (Td) by the total transmittance (Tt) by 100, and the haze value (H) described in the present invention (Example). Is a value (H15) converted to a value when each sample is 15 μm in order to eliminate measurement errors due to the thickness of each sample. The conversion formula is as follows. The thickness of the sample is measured using a film thickness meter (manufactured by YOSHIMITSU) after measuring the transmittance and haze value.

  In the formula, Tt is the total transmittance, Td is the diffuse transmittance, and L is the film thickness. For the film thickness, a value obtained by measuring the coating film after measurement with a film thickness meter is used.

Example 1
Using the polymer powder shown in Table 1 obtained in Production Example 1, W / O type foundations having the compositions shown in Tables 2 to 3 were produced by the following method. About the obtained W / O type foundation, the finish (difficulty in color unevenness, natural finish, transparency, difficulty in conspicuous pores, moisturizing feeling), difficulty in color change of cosmetic film, and feeling of use ( The goodness of touch and the goodness of spread were evaluated. The results are shown in Tables 2 to 5.

(Production method)
Components (20) to (22), which are oil phase components, having the compositions shown in Tables 2 to 3, were mixed at room temperature. Components (1) to (19) were added to the resulting mixture and dispersed with a disper. Components (23) and (24), which are aqueous phase components, were added to the obtained composition while stirring, and the resulting mixture was emulsified to obtain a W / O type foundation.

(Evaluation methods)
(1) Finish evaluation:
20 professional panelists use each foundation, and sensoryly evaluate the finish (difficulty in uneven color, natural finish, transparency, difficulty in conspicuous pores, moisturizing feeling (moist feel)), and the effect is very good A seven-point evaluation was performed with a high score of 7 points and a very low score of 1 point, and an average score was obtained.

(2) Difficulty in color change of cosmetic coating film:
20 expert panelists use each foundation to perform a sensory evaluation on the difficulty of color change of the cosmetic film over time, and a 7-point evaluation with 7 points when the effect is very high and 1 point when the effect is very low The average score was obtained.

(3) Usability:
20 expert panelists use each foundation and perform a sensory evaluation on the feeling of use (goodness and goodness), and performs a 7-step evaluation with 7 points when the effect is very high and 1 point when the effect is very low. The average score was obtained.

Claims (6)

The following components (A), (B) and (C):
(A) Using (meth) acrylic resin as a base material, (a) a white inorganic pigment, (b) a red inorganic pigment, and (c) a yellow inorganic pigment in a total content of 5 to 40% by mass , Polymer powder having a diameter of 1 to 5 μm,
(B) Using (meth) acrylic resin as a base material, (a) a white inorganic pigment, (b) a red inorganic pigment, and (c) a yellow inorganic pigment in a total content of 5 to 40% by mass , Polymer powder having a diameter of 8 to 15 μm,
(C) Cosmetics containing polymer powder that does not contain pigment and has an average particle size of 1 to 15 μm.   In the polymer powders of components (A) and (B), the mass ratio of (a) white inorganic pigment, (b) red inorganic pigment, and (c) yellow inorganic pigment is 70 to 99: 0.1 to 10: 0. The cosmetic according to claim 1, wherein the cosmetic is 1-20. The cosmetic according to claim 1 or 2, wherein the polymer powders of the components (A) and (B) have a total transmittance of 40% or more and less than 80% and a haze value of 45 or more and less than 100. The cosmetic according to any one of claims 1 to 3, wherein the component (C) comprises a (meth) acrylic resin as a base material. The makeup according to any one of claims 1 to 3, wherein the component (A) is contained in an amount of 0.01 to 50% by mass and the component (B) is contained in an amount of 0.01 to 50% by mass in the total composition. Fee. The mass ratio of components (A), (B), and (C) is (A) :( B) :( C) = 1-10: 1-10: 1-10. Cosmetics described in 1.