JP2008162941A - Polymer powder and cosmetic containing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide polymer powder which is good in adhesiveness to skins and in spreadabilitty, is high in irregular color-covering power and in uneven skin-covering power, gives uniform and natural finishes, and little changes colors with the passage of time, and to provide a cosmetic. <P>SOLUTION: This polymer powder encapsulating inorganic pigments is characterized in that the inorganic pigments comprise (A) a white inorganic pigment, (B) a red inorganic pigment, and (C) a yellow inorganic pigment in a (A):(B):(C) mass ratio of 70 to 99.0: 0.1 to 10: 0.1 to 20. The cosmetic contains the polymer powder. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a polymer powder containing an inorganic pigment and a cosmetic containing the same.

  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. Further, in Patent Document 2, an attempt is made to make it difficult to see skin irregularities such as wrinkles and pores 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

  The inventors of the present invention include a white inorganic pigment, a red inorganic pigment, and a yellow inorganic pigment in a specific ratio in the polymer powder, so that they adhere to and spread on the skin, and cover uneven color and uneven skin cover. It has been found that a polymer powder with high strength, uniform and natural finish, and less color change with time can be obtained.

The present invention is a polymer powder containing an inorganic pigment, and includes (A) a white inorganic pigment, (B) a red inorganic pigment, and (C) a yellow inorganic pigment, and (A) :( B) :( C ) Provides a polymer powder having a mass ratio of 70 to 99: 0.1 to 10: 0.1 to 20.
Moreover, this invention provides the cosmetics containing the said polymer powder.

  The polymer powder of the present invention makes the skin color unevenness and skin unevenness inconspicuous, gives a transparent and natural finish, has less unevenness during application, has little color change over time, and has excellent usability It is a thing.

  The polymer powder of the present invention contains a polymer as a base material and includes a white inorganic pigment, a red inorganic pigment, and a yellow inorganic pigment therein. Preferably, white inorganic pigments, red inorganic pigments, yellow inorganic pigments are dispersed in the polymer particles, or white inorganic powders, red inorganic pigments, yellow inorganic pigments are present on the surface of the polymer particles. In particular, it is preferable that the white inorganic powder, the red inorganic pigment, and the yellow inorganic pigment are uniformly dispersed in the polymer particles.

  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, aluminum oxide Metal oxides such as calcium oxide / magnesium oxide composite oxide and calcium oxide / zirconium oxide composite oxide; sulfates such as barium sulfate; carbonates such as calcium carbonate and the like. A mixture of seeds or more can be used. 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 red inorganic pigment include Bengala, iron oxide / titanium oxide sintered product, cadmium red, and molybdenum red. Bengala is preferable.
Examples of the 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 size of (A) white inorganic pigment, (B) red inorganic pigment, and (C) yellow inorganic pigment is 0.01 to 0.5 μm, respectively, and is uniformly dispersed in the polymer powder. To preferred.

  The mass ratio of (A) white inorganic powder, (B) red inorganic pigment, and (C) yellow inorganic pigment in the polymer powder is such that the short wavelength side of light is cut so that pores and color unevenness are not noticeable. 70 to 99: 0.1 to 10: 0.1 to 20, preferably 70 to 97: 1 to 10: 2 to 20, particularly preferably 80 to 97: 1 to 5: 2 to 15, Preferably it is 90-97: 1-3: 2-7.

  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 powder is 5 to 40% by mass, particularly 10 to 20% by mass, from the viewpoint of the balance between light transmittance and light scattering property of the powder.
In addition to (A), (B), and (C), the inorganic pigment may 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 type of polymer is nylon resin, paraffin or the like and cyclic lactam are mixed, heated and dissolved, and 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 type of polymer is a silicone resin, an aqueous solution of ammonia, amine or the like and a powder of inorganic pigment (including components (A), (B), (C)) 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. A pigment (including components (A), (B), and (C)) is added and dispersed. 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 average particle size of the polymer powder of the present invention is to provide a smooth finish with a natural transparency by expressing uniform adhesion to the skin groove part and the skin hill part such as pores. From the viewpoints of making the image less noticeable and suppressing a squeaky feeling at the time of use to give a good feeling of use and not giving the user a sense of incongruity, it is preferably 1 μm or more, particularly 3 μm or more. The upper limit value of the average particle diameter of the polymer particles is preferably 30 μm or less, particularly preferably 15 μm or less, from the viewpoint of suppressing powderiness during use.
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 of the present invention 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 preferred 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, Toray Dow Corning Co., Ltd.) well onto a glass plate to obtain a sample. It is performed with a meter HM-150 (Murakami Color Research Laboratory Co., Ltd.). For the measurement, light having a peak at a wavelength of 550 nm and 8 ° field light are used.

The cosmetic of the present invention contains the polymer powder as described above.
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.

  One or two or more kinds of polymer powders can be used, and 0.01 to 50% by mass, particularly 0.1 to 25% by mass in the total composition is preferable in terms of the feeling of use. When mixing and using 2 or more types, it is preferable from the point of color adjustment to change the ratio of each pigment and to mix the thing from which a color differs.

The cosmetic of the present invention can further contain a spherical powder other than those described above, imparts a bright and natural finish to the skin, and further improves morphological difficulties such as conspicuous pores and fine lines. it can.
The “spherical” used for the spherical powder includes the same as described above.

  The spherical powder adheres uniformly from the skin hill portion to the skin groove portion, and suitable spherical particles preferably have an average particle diameter of 1 to 15 μm, particularly preferably 2 to 9 μm, and a refractive index of 1.3 to 1. .8, especially spherical powders of 1.4 to 1.6 are preferred. If the refractive index is within this range, a more natural finish can be obtained. In addition, if the average particle diameter of the spherical powder is within this range, the spherical powder will not be buried in the decorative film, and the “blurring effect” that blurs the boundary between pores, fine lines, etc. and the skin mound will be sufficient. The effect is also improved.

  Specific examples of such spherical powder include spherical silica, metal oxides such as alumina, sulfates such as barium sulfate, inorganic compounds such as carbonates such as calcium carbonate, thermoplastic resins such as polymethyl methacrylate, Examples thereof include high molecular compounds such as nylon resin, silicone resin, urethane resin, and crosslinked polymer.

  Such spherical powder is contained in the total composition in an amount of 0.1 to 30% by mass, particularly 0.5 to 10% by mass, which makes it difficult to see the difficulty in form such as conspicuous pores and fine lines. It is excellent in effect and preferable in use.

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 petrolatum, 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 silicones; 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, powder foundations, oily foundations, lipsticks, eye shadows, blushers, etc .; medicinal cosmetics such as sunscreen emulsions. Suitable as a liquid foundation and an emulsified liquid foundation.

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 the polymerization was completed, the obtained product was filtered to collect a solid, washed with water, and then dried under reduced pressure to obtain 120 g of an inorganic pigment-containing 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, Toray Dow Corning) and applied to a glass plate. The kneading was performed at 100 revolutions using a Hoover Marler (kneader: Hoosmara, manufactured by YOSHIMITSU), and after scraping once, it was further kneaded 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 2
Using the polymer powder shown in Table 1 obtained in Example 1, W / O type foundations having the compositions shown in Tables 2 to 4 were produced by the following method. About the obtained W / O type foundation, the finish (difficulty of color unevenness, natural finish, transparency, difficulty of conspicuous pores, skin brightness), difficulty of color change of the cosmetic film, and use The feeling (goodness and goodness) was evaluated. A result is combined with Table 2-Table 4, and is shown.

(Production method)
In the compositions shown in Tables 2 to 4, components (26) to (28), which are oil phase components, were mixed at room temperature. Components (1) to (25) were added to the resulting mixture and dispersed with a disper. Components (29) and (30), which are aqueous phase components, were added to the obtained composition while stirring to obtain a W / O type foundation.

(Evaluation methods)
(1) Finish evaluation:
20 professional panelists use each foundation and perform sensory evaluation on the finish (difficulty in uneven color, natural finish, transparency, difficulty in conspicuous pores, skin brightness), and the effect is very high A 7-point evaluation was performed with 7 points, with a very low case being 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.

Example 3 (powder foundation)
A powder foundation having the composition shown in Table 5 was produced.
About the obtained powder foundation, it was finished in the same manner as in Example 2 (finishing of color unevenness, natural finish, transparency, difficulty of conspicuous pores, skin brightness), and color change of the cosmetic film. The difficulty and usability (goodness and goodness) were evaluated. The results are also shown in Table 5.

(Production method)
The powder components (1) to (14) are mixed and pulverized through a pulverizer. This is transferred to a high-speed blender, and oily components (15) and (16) mixed and dissolved at 80 ° C. are added and mixed uniformly. After mixing, grind again and pass through a sieve. This was compression molded into a metal pan to obtain a powder foundation.

Claims (5)

  Polymer powder containing an inorganic pigment, comprising (A) a white inorganic pigment, (B) a red inorganic pigment, and (C) a yellow inorganic pigment, and a mass ratio of (A) :( B) :( C) Is a polymer powder of 70-99: 0.1-10: 0.1-20.   The polymer powder according to claim 1, comprising a total of 5 to 40% by mass of inorganic pigments.   The polymer powder according to claim 1 or 2, wherein the average particle size is 1 to 30 µm.   The polymer powder according to any one of claims 1 to 3, wherein the total transmittance is 40% or more and less than 80%, and the haze value is 45 or more and less than 100.   Cosmetics containing the polymer powder of any one of Claims 1-4.