JP2010143830A - Cosmetic containing polyvinyl alcohol fine particle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cosmetic which excels in the adhesion to the skin, exhibits an irregularity correcting effect due to the light scattering effect, and excels in finishing and a feeling of use. <P>SOLUTION: The cosmetic contains polyvinyl alcohol fine particles having an average particle diameter of 0.01-100 μm. The fine particles preferably have a crosslinking structure obtained from polyvinyl alcohol and an aldehyde compound. Particularly, fine particles are preferably the ones obtained by forming an emulsion using a mixed aqueous solution of polyvinyl alcohol/aldehyde compound/acid catalyst as a dispersion medium, and an organic solvent, which does not substantially dissolve the mixed aqueous solution and the obtained fine particles, as dispersoids and acetalizing the polyvinyl alcohol in the dispersion medium to form spherical fine particles. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cosmetic containing fine particles of polyvinyl alcohol, excellent in adhesion to the skin, and excellent in light scattering effect, finish and feeling of use.

  In recent years, unevenness-correcting cosmetics that make unevenness on the skin such as pores and wrinkles less noticeable have been put on the market in various product forms such as creams, foundations, makeup bases, gel preparations, and lotions. Conventional unevenness correction cosmetics mainly use general-purpose spherical powders such as silica and silicone powder, and these spherical powders reduce the shadow of the recesses due to the surface scattering effect of light due to the shape, and the unevenness Is inconspicuous.

  However, since these general-purpose spherical powders themselves have poor adhesion to the skin, they are usually weakly adhered to the skin surface by various oily components and film components that are blended simultaneously with cosmetics. When cosmetics containing these conventional spherical powders with weak adhesion are applied to the skin, there is almost no adhesion of the spherical powder to the skin and there is a tendency to selectively gather in the skin groove.

  Although the selective localization of general-purpose spherical powder to the skin groove is effective in terms of correcting the unevenness of the skin, plate powders such as extender pigments and pearl luster pigments that are used together tend to localize in the skin Therefore, there is a problem that the spherical powder and the plate-like powder are localized separately, which leads to an unnatural makeup finish called so-called texture (texture) drop.

  In order to solve such problems, various composite powders in which the surface of a plate-like powder is coated with a light scattering substance have been developed. These impart light scattering properties to the plate-like powder to obscure the boundary between the skin groove and the hill and produce a natural finish. One example is a composite powder in which spherical PMMA is coated on the surface of mica titanium by drying a mixed slurry of pearl luster pigment such as titanium mica and spherical fine particles of polymethyl methacrylate (PMMA) with a spray dryer (Patent Document). 1). In addition, a composite powder in which the surface of various extender pigments such as mica is coated with spherical barium sulfate by a wet method has been developed (Patent Document 2).

Japanese Patent Laid-Open No. 9-48707 JP 2004-300080 A

  However, the conventional composite powder is simply an improvement of the plate-like powder, and the defects inherent in the plate-like powder, for example, the inferior smoothness of use feeling cannot be completely solved. Therefore, it has been desired to develop a spherical powder that has a smooth feeling of use, has excellent adhesion, and can produce a natural finish.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have blended polyvinyl alcohol fine particles having a specific particle diameter, so that the adhesion to the skin, the natural finish due to light scattering, and use The present inventors have found that a cosmetic material excellent in feeling can be obtained, and have completed the present invention.

  That is, the present invention provides a cosmetic comprising polyvinyl alcohol fine particles having an average particle diameter of 0.01 to 100 μm.

(1) The cosmetic of the present invention is excellent in natural finish. By blending the polyvinyl alcohol fine particles, a light scattering effect is exhibited even in the skin, and a good cosmetic effect can be obtained without any loss of texture.
(2) The cosmetic of the present invention is excellent in the feeling of use. Since the polyvinyl alcohol fine particles have an elastic use feeling, the cosmetics containing them are soft and have a smooth feel. Moreover, since sweat and sebum are absorbed inside the polyvinyl alcohol fine particles, there is an effect of suppressing shine when applied to the skin.

The cosmetic of the present invention is characterized by containing polyvinyl alcohol fine particles (hereinafter referred to as “PVA fine particles”) having an average particle diameter of 0.01 to 100 μm, preferably 1 to 100 μm.
The PVA fine particles used in the present invention are preferably spherical water-swellable fine particles comprising an acetalized product of polyvinyl alcohol or a cross-linked product thereof. In particular, fine particles having a crosslinked structure obtained from polyvinyl alcohol and an aldehyde compound are preferable.

  The average particle diameter can be a value (primary particle diameter) obtained by, for example, number average of the particle diameter of each fine particle measured by observation with an electron microscope. When the average particle size of the PVA particles is less than 0.01 μm, the transparency is too high, and thus it is difficult to obtain the unevenness correction effect. When the average particle size exceeds 100 μm, roughness or the like is observed and the feeling of use may not be preferred.

  The PVA fine particles in the present invention form an emulsion using (i) an aqueous solution of PVA / aldehyde compound / acid catalyst as a dispersoid, and an organic solvent that does not substantially dissolve the aqueous solution and the obtained PVA fine particles as a dispersion medium, PVA can be acetalized in a dispersoid to obtain fine particles, or (ii) an acetalized product of PVA can be produced and pulverized to obtain fine particles. Among these production methods, the method (i) is preferable in that spherical particles having a narrow particle size distribution are obtained and removal of unreacted raw materials is easy.

The manufacturing method (i) includes the following three steps.
(1) An emulsion having an organic solvent that is substantially incompatible with water as a dispersion medium and a mixed aqueous solution containing PVA, an aldehyde compound, and an acid as a dispersoid is prepared.
(2) The emulsion is heated, and an acetalization reaction with PVA and an aldehyde compound proceeds in the dispersoid to form unnecessary PVA fine particles in water.
(3) The obtained PVA fine particles are filtered, washed and dried.

  The mixed aqueous solution in the step (1) is prepared by adding and mixing an aldehyde compound and an acid to the PVA aqueous solution. Here, the density | concentration of PVA is 10-50 mass% normally, More preferably, you may be 20-40 mass%. When the PVA concentration is higher than 50% by mass, it becomes difficult to produce a PVA aqueous solution and workability is also lowered. Conversely, when the PVA concentration is lower than 10% by mass, it is difficult to uniformly disperse in the solvent.

Preparation of the emulsion in the step (2) is carried out by adding the PVA mixed aqueous solution prepared in the step (1) to the dispersion medium and stirring vigorously. The stirring device used for emulsification is not particularly limited as long as strong stirring is possible, but a homogenizer is preferably used. The stirring speed cannot be generally specified depending on the mixing ratio of the dispersion medium and the dispersoid, the respective viscosities, the type of the stirring device, and the like, but is usually 2000 rpm or more, more preferably 3000 rpm or more. If the stirring speed is too slow, the particle size of the emulsion becomes large, and PVA fine particles having a predetermined average particle size may not be obtained.
In addition, in order to improve the stability of the obtained emulsion, it is also possible to use a known surfactant used as an emulsifier in a water-in-oil emulsion.

The recommended reaction conditions in the step (2) are as follows.
Reaction temperature: usually 30-100 ° C, more preferably 40-80 ° C
Reaction time: Usually 1 minute to 3 hours, more preferably 5 minutes to 1 hour

The post-treatment in the step (3) is performed by solid-liquid separation of the emulsion obtained in the step (2) by filtration or the like, washing the obtained PVA fine particles, and the dispersion medium remaining on the fine particle surface, unreacted aldehyde Removing the compound and residual catalyst.
As the washing solvent used in the step (3), hydrocarbons such as heptane and hexane are preferred for washing the dispersion medium. For removal of unreacted raw materials and catalysts, and washing hydrocarbons used earlier. Is preferably an alcohol such as methanol or ethanol.
Furthermore, it is preferable to remove the moisture in the fine particles by drying the obtained PVA fine particles. Preferred drying conditions are as follows.
-Drying temperature: Usually 20 to 120 ° C, more preferably 50 to 110 ° C
-Drying time: Usually 50 to 500 minutes, more preferably 100 to 200 minutes

  The PVA used as a raw material in the above production method preferably has a relatively low saponification degree. For example, PVA having a saponification degree of 70 to 90 mol%, particularly 75 to 85 mol%, and an average polymerization degree of 200 to 2000, particularly 300 to 1000 is preferably used. If the degree of saponification of PVA is too high, the fine particles produced may become hard or the degree of swelling due to water may decrease. If the degree of saponification is too low, water solubility will be poor, and a uniform aqueous solution will be obtained during production. May be difficult.

  PVA may be a commercially available product, for example, a reagent marketed by Aldrich or Tokyo Kasei, or Gohsenol (registered trademark) marketed by Nippon Synthetic Chemical Industry. Some of these commercially available products have various degrees of polymerization and / or saponification. As commercially available products having the preferred saponification degree, Gohsenol (registered trademark) G grade or K grade manufactured by Nippon Synthetic Chemical Industry. Etc. can be illustrated.

The aldehyde compound includes a monoaldehyde compound, a dialdehyde compound, or a polyaldehyde compound. Specifically, monoaldehyde compounds such as formaldehyde, acetaldehyde, propionaldehyde, crotonaldehyde, benzaldehyde; dialdehyde compounds such as glyoxal, glutaraldehyde, malondialdehyde, terephthalaldehyde; and polyaldehydes such as dialdehyde starch and polyacrolein Compounds. As these aldehyde compounds, for example, reagents commercially available from Aldrich or Tokyo Kasei can also be used.
Among the aldehyde compounds, a dialdehyde compound is preferable from the viewpoint of obtaining a crosslinked product, and among the dialdehyde compounds, glutaraldehyde is particularly preferable in terms of high safety.

  The acid is a component that acts as a catalyst for the acetalization reaction with an aldehyde compound of PVA. The acid to be used may be an inorganic acid or an organic acid, but an inorganic acid, particularly hydrochloric acid is preferred from the viewpoint that a large catalytic effect can be obtained by adding a small amount. The acid used here can be obtained as a commercially available reagent or an industrial raw material. For example, inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid. Examples include organic acids such as oxalic acid and acetic acid.

  The addition amount of the acid is usually in the range of 1 to 50 mol%, preferably 2 to 20 mol%, relative to the aldehyde compound. If the amount of acid added is too small, the acetalization reaction rate becomes insufficient, and it takes a long time to produce PVA fine particles. Moreover, when there is too much addition amount of an acid, reaction rate will become quick too much and it may become difficult to obtain PVA microparticles | fine-particles stably.

  The dispersion medium needs to be an organic solvent that is substantially incompatible with water and does not dissolve the generated PVA fine particles, and is not particularly limited as long as the medium satisfies the conditions. From the viewpoint that the dispersoid can be uniformly dispersed, hydrocarbons, particularly aliphatic saturated hydrocarbons are preferred. Among these, liquid paraffin is preferable because of its high safety.

  The amount of the dispersion medium is usually 100 to 3000 parts by weight, more preferably 300 to 2000 parts by weight, and still more preferably 500 parts by weight with respect to 100 parts by weight of the dispersoid composed of the mixed aqueous solution containing PVA, an aldehyde compound, and an acid. It is set as the range of -1000 weight part. When the amount of the dispersion medium is too small, the dispersibility is deteriorated, and an aggregate of many particles is easily formed, and the average particle size of the particles tends to increase. On the other hand, when the amount of the dispersion medium is too large, the production efficiency is lowered.

  By producing according to the method described above, spherical PVA fine particles having an average particle diameter of 0.01 to 100 μm suitable for the present invention can be obtained. In addition, this PVA fine particle also has the characteristic that it swells to an aqueous solvent.

In general, microparticles called “microgels” are extremely fine particles mainly having a size on the order of nanometers, and it has been found that microgels made of acrylic polymers are excellent as thickeners in cosmetics (for example, JP 2004-43785 A).
On the other hand, the PVA microparticles of the present invention obtained by the above method are micrometer-order microparticles suitable for improving the feel of cosmetics, and are very effective in improving the light scattering characteristics and the feeling of use.

  In addition, since the fine particles used in the present invention are fine particles mainly composed of PVA having excellent adhesion to the skin, unlike conventional spherical particles such as silica and silicone resin powder, the fine particles have adhesion to the skin. Are better. Furthermore, by making it amphiphilic by appropriately controlling the degree of saponification of PVA, it can be incorporated into various cosmetic bases including hydrophilicity and lipophilicity.

  The cosmetic of the present invention can be obtained by mixing and dispersing the PVA fine particles described above in detail in an appropriate medium (preferably an aqueous phase in which water or a water-soluble cosmetic ingredient is dissolved) by a conventional method. That is, the cosmetic of the present invention has an excellent commercial value that it can be produced by a very simple manufacturing process.

  The compounding amount of the PVA fine particles in the cosmetic of the present invention is usually 0.01 to 60% by mass, more preferably 0.1 to 30% by mass with respect to the total amount of the cosmetic. When the blending amount of the PVA fine particles is less than 0.01% by mass, it is difficult to obtain a sufficient light scattering effect, and when the blending amount exceeds 60% by mass, it may be difficult to make a cosmetic preparation.

  Since the PVA fine particles blended in the cosmetic of the present invention have a larger particle size than conventional microgels, they can be easily taken out as water-containing particles or dry particles by filtration or the like. Therefore, compared with the conventional microgel which exists normally in the state of a thin slurry, it can be said that the compounding quantity to cosmetics can be increased dramatically.

  Further, the PVA fine particles used in the cosmetic of the present invention are micron order particles having excellent adhesion. Accordingly, not only shallow irregularities such as pores and textures, but also deep irregularities such as wrinkles, and scratches and burn marks can be retained, and various irregularities on the skin can be corrected. That is, the cosmetic of the present invention is particularly suitable as a cosmetic that makes the unevenness of the skin, such as pores, wrinkles, scars, stitches, and burn marks, inconspicuous.

  Therefore, the cosmetic of the present invention is particularly suitable as an unevenness correction cosmetic based on an aqueous base such as a makeup base, an emulsified foundation, or a cream or an emulsified base.

 In the cosmetic of the present invention, in addition to the PVA fine particles, various components usually used in cosmetics, pharmaceuticals and the like can be blended as necessary. Examples include oils, medicinal ingredients, moisturizing ingredients, anti-inflammatory agents, bactericides, preservatives, ultraviolet absorbers, antioxidants, organic and inorganic powders, fragrances, and pigments.

  The oil component may be a liquid oil component, a solid oil component, a semi-solid oil component, or a substance hardly soluble in water. 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, Cottonseed oil, evening primrose oil, eno oil, soybean oil, peanut oil, tea seed oil, kaya oil, rice bran oil, cinnagari oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin, trioctanoic acid glycerin, triisopalmitic acid glycerin, etc. Liquid oil, cacao oil, coconut 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, Solid oils and fats such as mole, hardened castor oil, beeswax, candelilla wax, cotton wax, carnauba wax, bayberry wax, ibota wax, whale wax, montan wax, nukarou, Norin, cabbage wax, lanolin acetate, liquid lanolin, sugar cane wax, lanolin fatty acid isopropyl, hexyl laurate, reduced lanolin, jojoballow, hard lanolin, shellac wax, POE lanolin alcohol ether, POE lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, POE hydrogenated Waxes such as lanolin alcohol ether, liquid paraffin, ozokerite, squalene, pristane, paraffin, ceresin, squalane, petrolatum, microcrystalline wax and other hydrocarbons, isopropyl myristate, octyl octoate, octyldodecyl myristate, isopropyl palmitate, Butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, dimethylo Hexyldecyl tanoate, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearylate, ethylene glycol di-2-ethylhexylate, dipentaerythritol fatty acid ester, N-alkyl monoisostearate Glycol, neopentyl glycol dicaprate, diisostearyl malate, glycerin di-2-heptylundecanoate, trimethylolpropane tri-2-ethylhexylate, trimethylolpropane triisostearate, pentaerythritol tetra-2-ethylhexylate, tri Glycerin-2-ethylhexylate, trimethylolpropane triisostearate, cetyl-2-ethylhexanoate, 2-ethylhexylpa Lumitate, glyceryl trimyristate, glyceride tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, diisopropyl adipate, N-lauroyl- L-glutamic acid-2-octyldodecyl ester, di-2-heptylundecyl adipate, 2-cyanohexyl-2-cyano-3,3-diphenyl-2-propenoate, ethyl laurate, di-2-ethylhexyl sepatate, Such as 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate, 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, triethyl citrate, etc. Synthetic ester, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid (behenyl) acid, oleic acid, 12-hydroxystearic acid, undecylenic acid, tolic acid, lanolin fatty acid, isostearic acid, linoleic acid, linolenic acid, ester Higher fatty acids such as icosapentaenoic acid, lauric alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, monostearyl glycerene ether (batyl alcohol), 2-decyltetradecinol, lanolin alcohol, cholesterol, Linear, branched higher alcohols such as hexyl decanol, isostearyl alcohol, octyl dodecanol, dimethylpolysiloxane, methylphenylpolysiloxane Silicone oil such as sun, perfluorocarbon or perfluoropolyether such as perfluorodecalin, perfluorohexane, triperfluoro-n-butylamine, vitamin A and derivatives thereof, vitamin D and derivatives thereof, vitamin E and derivatives thereof, vitamins Vitamins such as K and its derivatives, sterols, natural and synthetic fragrances and the like. Here, a liquid oil component having a melting point of normal temperature or lower is distinguished from a solid or semi-solid oil component having a melting point of normal temperature or higher.

  The drug component may be any of oil-soluble, water-soluble, and amphiphilic. Specific examples include agents such as whitening agents, moisturizers, anti-inflammatory agents, antibacterial agents, hormone agents, vitamins, various amino acids and their derivatives, enzymes, antioxidants, and hair restorers.

Examples of whitening agents include hydroquinone derivatives such as arbutin, kojic acid, L-ascorbic acid (vitamin C) and derivatives thereof, pantotenyl ethyl ether, tranexamic acid and derivatives thereof, placenta extract and plant extract (eg chamomile extract), etc. Examples of these extracts are exemplified.
Examples of L-ascorbic acid derivatives include L-ascorbic acid monostearate, L-ascorbic acid monopalmitate, L-ascorbic acid monoalkyl esters such as L-ascorbic acid monooleate, L-ascorbic acid monophosphate, L L-ascorbic acid monoesters such as ascorbic acid-2-sulfate; L-ascorbic acid dialkyl esters such as L-ascorbic acid distearate, L-ascorbic acid dipalmitate, L-ascorbic acid dioleate; L-ascorbic acid dilin L-ascorbic acid diesters such as acid esters; L-ascorbic acid trialkyl esters such as L-ascorbic acid tristearate, L-ascorbic acid tripalmitate, L-ascorbic acid trioleate; - ascorbic acid triesters such as ascorbic acid triphosphate ester; and L- ascorbic acid glucosides such as L- ascorbic acid 2-glucoside and the like. Examples of L-ascorbic acid and derivatives thereof include L-ascorbic acid, L-ascorbic acid phosphate, L-ascorbic acid-2-sulfate, L-ascorbic acid 2-glucoside, or salts thereof.

  Examples of the tranexamic acid derivative include a dimer of tranexamic acid (for example, trans-4- (trans-aminomethylcyclohexanecarbonyl) aminomethylcyclohexanecarboxylic acid, etc.), an ester of tranexamic acid and hydroquinone (for example, trans-4 -Aminomethylcyclohexanecarboxylic acid 4'-hydroxyphenyl ester, etc.), ester form of tranexamic acid and gentisic acid (for example, 2- (trans-4-aminomethylcyclohexylcarbonyloxy) -5-hydroxybenzoic acid and its salt, ), An amide form of tranexamic acid (for example, trans-4-aminomethylcyclohexanecarboxylic acid methylamide and its salt, trans-4- (P-methoxybenzoyl) aminomethylcyclohexanecarboxylic acid and Salts, trans-4-guanidinomethyl cyclohexane carboxylic acid and salts thereof, etc.) and the like.

Examples of the anti-inflammatory agent include glycyrrhizin, glycyrrhizinate (eg, dipotassium glycyrrhizinate, ammonium glycyrrhizinate, etc.), allantoin and the like.
Examples of the humectant include urea.
Examples of the antibacterial agent include resorcin, sulfur, salicylic acid and the like.
Examples of the hormone agent include oxytocin, corticotropin, vasopressin, secretin, gastrin, calcitonin, hinokitiol, ethinyl estradiol and the like.

Examples of vitamins include vitamin A and its derivatives (for example, retinol, vitamin A palmitate, etc.), vitamin B6, vitamin B6 derivatives such as vitamin B6 hydrochloride, nicotinic acid derivatives such as nicotinic acid and nicotinamide, vitamin E And derivatives thereof, β-carotene and the like.
Examples of various amino acids and their derivatives and enzymes include L-glutamic acid, urocanic acid, trypsin, lysozyme chloride, chymotrypsin, semi-alkaline proteinase, serrapeptase, lipase, and hyaluronidase.
Examples of the antioxidant include thiotaurine, glutathione, catechin, albumin, ferritin, metallothionein and the like.
Examples of the hair restoring agent include β-glycyrrhetinic acid, pantothenyl ethyl ether, minoxidil and the like.
Also, a refreshing agent such as camphor or menthol can be used.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
First, a production example of PVA fine particles used in the present invention will be shown. Hereinafter, the blending amount is expressed in mass% unless otherwise specified.

(Production Example 1)
An aqueous solution obtained by mixing 20 g of a 30% aqueous solution of PVA (saponification degree 78.5 mol%, average polymerization degree 500), 4 g of 25% aqueous solution of glutaraldehyde, and 1.9 g of 0.5N hydrochloric acid was obtained as liquid paraffin. The emulsion was added to 150 g and stirred with a homogenizer at a stirring speed of 4000 rpm to obtain an emulsion in which the aqueous solution was finely dispersed in liquid paraffin.
The obtained emulsion is put in a water bath together with the container, heated to 50 ° C. while stirring at a stirring speed of 4000 rpm, heated for 10 minutes while being heated to 50 ° C., and subjected to a crosslinking reaction by acetalization of PVA in the aqueous phase, A particulate hydrogel was obtained.
The mixture was cooled to room temperature with stirring, and suction filtered with a Nutsche, the fine particles on the Nutsche were washed with heptane to remove liquid paraffin, and further washed with ethanol to remove heptane.
It dried for 120 minutes in a 105 degreeC hot air dryer, and obtained PVA microparticles | fine-particles.
The obtained PVA fine particles were observed with an electron microscope (see FIG. 1), and the average particle diameter of 50 randomly extracted particles was determined to be 36 μm.

(Production Example 2)
In Production Example 1, PVA fine particles were produced in the same manner as in Production Example 1 except that the amount of each raw material was changed as shown in Table 1 (right column) below.
The average particle diameter of the obtained PVA fine particles was 30 μm.

(Examples 1-2 and Comparative Example 1)
A base cosmetic having the composition shown in Table 2 below was prepared. In addition, the comparative example 1 is the cosmetics which mix | blended the conventional spherical inorganic powder (spherical silica) instead of the PVA fine particle of this invention.
・ Method for preparing cosmetics:
Each water-soluble component was dissolved in purified water by heating and then dispersed with a homomixer to prepare an aqueous phase. Each powder component was added to the obtained aqueous phase and homomixer dispersion was performed, and then an oil phase component dissolved by heating in advance was added and emulsified in a heated state. The obtained emulsified composition was further cooled to 30 ° C. or lower and degassed to obtain an O / W base cosmetic.

・ Evaluation method and evaluation criteria:
The quality of use (“smoothness”, “adhesion to skin”, “thickness”) and finish (“pores and texture are inconspicuous” “color unevenness is inconspicuous”) by 10 professional panels It was evaluated according to criteria.
A: More than 7 out of 10 answered “good” or “can feel”.
○: 5 or more out of 10 answered “good” or “real”.
Δ: 3 or more out of 10 answered “good” or “real”.
X: 2 or less of 10 respondents answered “Good” or “I can feel it”.

-Evaluation of feeling of use As shown in Table 2, the foundation cosmetics (Examples 1 and 2) of the present invention containing the above-mentioned PVA fine particles have smoothness at the time of application and adhesion to the skin due to the elasticity of the fine PBA powder. Excellent use feeling such as sex. Further, it can be thicker than a conventional base cosmetic containing spherical inorganic powder (silica), and is effective in covering uneven skin.

・ Evaluation of finish As shown above, the foundation cosmetics of each example can be thickened, which was not obtained with conventional spherical inorganic powders such as silica, so that skin such as pores and textures can be obtained. As a result, the unevenness of the color became inconspicuous, the light scattering property was excellent, and the uneven color correction effect was comparable to that of conventional cosmetics containing spherical inorganic powder.

(Formulation example 1) W / O makeup base
Component content (% by mass)
Fine particles of Production Example 1
Dimethylpolysiloxane (6 mPa · s) 5
Decamethylcyclopentasiloxane 25
Polyoxyethylene / methylpolysiloxane copolymer 3
Glycerin 1
1,3-butylene glycol 5
Xylit 0.5
Isostearic acid 0.5
Silica anhydride coated with alkyl-modified silicone resin 2
Talc 0.5
Aluminum stearate 1
Bengala-coated mica titanium 0.1
Sodium hexametaphosphate 0.05
Dipotassium glycyrrhizinate 0.1
L-serine 0.1
Hypericum extract 0.1
DL-α-tocopherol acetate 0.2
Thiotaurine 0.1
Togenashi extract 0.1
Peonies extract 0.1
Acetylated sodium hyaluronate 0.1
Yukinoshita extract 0.1
Paraoxybenzoic acid ester Appropriate amount Phenoxyethanol Appropriate amount Dextrate palmitate-coated yellow iron oxide 0.1
Dimethyl distearyl ammonium hectorite 1
Purified water Residual trimethylsiloxysilicic acid 1.5
Spherical polyethylene powder 5
Perfume

(Prescription Example 2) O / W Liquid Foundation
Component content (% by mass)
Fine particles of Production Example 1 6
Behenyl alcohol 0.5
Dipropylene glycol 6
Stearic acid 1
Glycerol monostearate 1
Potassium hydroxide 0.2
Triethanolamine 0.8
DL-α-tocopherol acetate 0.1
P-Hydroxybenzoic acid ester Appropriate amount of yellow iron oxide 1
α-olefin oligomer 3
Dimethylpolysiloxane (6 mPa · s) 2
Dimethylpolysiloxane (100 mPa · s) 5
Batyl alcohol 0.5
Isostearic acid 1
Behenic acid 0.5
Cetyl 2-ethylhexanoate 10
Polyoxyethylene glyceryl monostearate 1
Titanium oxide 3
Mica titanium / polyalkyl acrylate composite powder 0.5
Silica / alumina treated titanium oxide 10
Polyalkyl acrylate coated mica titanium 0.5
Black iron oxide coated mica titanium 0.5
2-Ethylhexyl paramethoxycinnamate 2
Bengala appropriate amount ultramarine blue appropriate amount black iron oxide appropriate amount legal dye appropriate amount xanthan gum 0.1
Bentonite 1
Sodium carboxymethylcellulose 0.1
Purified water Residual fragrance Appropriate amount

(Formulation example 3) Two-layer type foundation
Component content (% by mass)
Fine particles of Production Example 1 5
Ethanol 10
Glycerin 10
1,3-butylene glycol 7
Silica-coated titanium oxide 8
Synthetic phlogopite 3
Bengala coated mica titanium (color rendering pearl G) 2
Sodium chloride 0.3
Hydroxypropyl-β-cyclodextrin 0.1
Mukuroji extract 0.1
Green tea extract 0.1
Lily extract 0.1
Bengala 0.1
Gellan gum 0.1
Porous spherical cellulose 0.1
Lavender extract 0.1
Purified water residue

(Formulation Example 4) Whitening lotion
Component content (% by mass)
Fine particles of Production Example 1 0.3
Ethanol 10
Dipropylene glycol 1
Polyethylene glycol 1000 1
Polyoxyethylene methyl glucoside 1
Glyceryl tri-2-ethylhexanoate 0.1
Polyoxyethylene hydrogenated castor oil 0.2
Polyglyceryl diisostearate 0.15
N-stearoyl-L-glutamate sodium 0.1
Citric acid 0.05
Sodium citrate 0.2
Potassium hydroxide 0.4
Dipotassium glycyrrhizinate 0.1
Arginine hydrochloride 0.1
Nettle extract 0.1
Tranexamic acid 2
Potassium 4-methoxysalicylate 1
Edetate trisodium 0.05
2-Ethylhexyl paramethoxycinnamate 0.01
Dibutylhydroxytoluene Appropriate amount Paraben Appropriate amount Deep sea water 3
Purified water Residual fragrance Appropriate amount

(Formulation example 5) Whitening moisturizing lotion
Component content (% by mass)
Fine particles of Production Example 1 0.5
Glycerin 1
Dipropylene glycol 12
Ethanol 8
POE methyl glucoside 3
POE (24) POP (13) decyl tetradecyl ether 0.5
Citric acid 0.02
Sodium citrate 0.08
Hydroxypropyl-β-cyclodextrin 0.5
Thiotaurine 0.1
Adenosine triphosphate-2 sodium 0.1
Sodium hyaluronate 0.01
EDTA3 sodium 0.01
Hydroxyethyl cellulose 0.1
L-ascorbic acid 2-glucoside 2
Arbutin 0.05
Paraben Appropriate amount Purified water Residual perfume Appropriate amount

(Formulation Example 6) Moisturizing lotion
Component content (% by mass)
Fine particles of Production Example 1 0.2
Ethanol 5
POE oleyl alcohol ether 2
Diethoxyethyl succinate 3
2-Ethylhexyl-P-dimethylaminobenzoate 0.18
1,3 butylene glycol 9.5
Sodium pyrrolidonecarboxylate 0.5
Nicotinamide 0.3
Glycerin 5
Fragrance 0.05
Purified water residue

(Prescription Example 7) Daytime serum
Component content (% by mass)
Fine particles of Production Example 2 1
Ethanol 4
Glycerin 1
1,3-butylene glycol 5
Octyl methoxycinnamate 0.2
Liquid paraffin 0.02
Sodium hexametaphosphate 0.03
Trimethylglycine 1
Sodium polyaspartate 0.1
α-tocopherol 2-L-ascorbic acid potassium phosphate diester 0.1
Thiotaurine 0.1
Green tea extract 0.1
Western mint extract 0.1
Iris root extract 0.1
HEDTA3 sodium 0.1
Carboxyvinyl polymer 0.05
Potassium hydroxide 0.02
Phenoxyethanol Appropriate amount Purified water Residual perfume Appropriate amount

(Prescription Example 8) Non-alcoholic lotion
Component content (% by mass)
Fine particles of Production Example 1 0.3
Glycerin 2
1,3-butylene glycol 4
Erythritol 1
Polyoxyethylene methyl glucoside 1
Polyoxyethylene hydrogenated castor oil 0.5
Citric acid 0.02
Sodium citrate 0.08
Phenoxyethanol appropriate amount methylpolysiloxane 0.02
N-coconut oil fatty acid acyl L-arginine ethyl DL-pyrrolidone carboxylic acid 0.1
Purified water residue

(Formulation example 9) Thorough lotion
Component content (% by mass)
Fine particles of Production Example 1 0.1
Ethanol 5
Glycerin 0.5
Dipropylene glycol 2
1,3-butylene glycol 6
Rosemary oil 0.01
Sage oil 0.01
Citric acid 0.02
Sodium citrate 0.08
Sodium hexametaphosphate 0.03
Hydroxypropyl-β-cyclodextrin 0.1
Mukuroji extract 0.1
Ages Extract 0.1
Lily extract 0.1
Oat extract 0.1
Togenashi extract 0.1
Kiso Extract 0.1
Lavender oil 0.1
Tounin extract 0.1
Retinol 0.02
Sodium alginate 0.001
Purified water residue

(Formulation Example 10) Whitening cosmetic liquid
Component content (% by mass)
Fine particles of Production Example 2 0.3
Dimethylpolysiloxane 5
Glycerin 2
1,3-butylene glycol 5
Polyethylene glycol 1500 3
Polyethylene glycol 20000 3
Cetyl octanoate 3
Citric acid 0.01
Sodium citrate 0.1
Sodium hexametaphosphate 0.1
Dipotassium glycyrrhizinate 0.1
Ascorbic acid glucoside 2
Tocopherol acetate 0.1
Ogon Extract 0.1
Yukinoshita extract 0.1
Edetate trisodium 0.1
Xanthan gum 0.05
Acrylic acid / alkyl methacrylate copolymer (Pemulene TR-2) 0.05
Agar powder 1.5
Phenoxyethanol Appropriate amount Dibutylhydroxytoluene Appropriate amount of purified water Residue

  ADVANTAGE OF THE INVENTION According to this invention, the cosmetics excellent in the adhesiveness to skin and excellent in the soft focus effect and the usability | use_condition can be provided. The cosmetic material of the present invention makes it easy to produce a thick cosmetic film due to its excellent adhesion, and its high soft focus effect can effectively appeal the impression of the unevenness correction effect of the cosmetic material to consumers.

4 is a SEM photograph of the polyvinyl alcohol fine particles produced in Production Example 1.

Claims (7)

A cosmetic comprising polyvinyl alcohol fine particles having an average particle diameter of 0.01 to 100 μm. The cosmetic according to claim 1, wherein the fine particles are fine particles having a crosslinked structure obtained from polyvinyl alcohol and an aldehyde compound. The fine particles form an emulsion using a mixed aqueous solution of polyvinyl alcohol / aldehyde compound / acid catalyst as a dispersoid, and an organic solvent in which the mixed aqueous solution and the resulting fine particles are not substantially dissolved. The cosmetic according to claim 1 or 2, which is obtained by acetalizing alcohol to produce spherical fine particles. The cosmetic according to claim 2 or 3, wherein the aldehyde compound is a polyfunctional aldehyde compound. The cosmetic according to claim 4, wherein the aldehyde compound is glutaraldehyde. The cosmetic according to any one of claims 1 to 5, wherein the polyvinyl alcohol has a polymerization degree of 200 to 2000 and a saponification degree of 70 to 90%. The cosmetic according to any one of claims 1 to 6, wherein unevenness of the skin such as pores, wrinkles, scars, suture marks, burn marks, etc. is made inconspicuous.