JP2000169342A - Solid powder cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a solid powder cosmetic having excellent moldability, excellent impact resistance, and excellent durability, good in spreadability and adhesivity on employment, and well covering wrinkles by adding a specific amount of metal soap particles having a specified particle size distribution. SOLUTION: This solid powder cosmetic contains 1-70 wt.% of metal soap particles (for example, zinc stearate, calcium stearate or magnesium stearate) having a difference RC-RA of <=3 μm between 30% particle diameter RA (30% of particles among the total amount of the metal soap particles have particle diameters not larger than this particle diameter) and 70% particle diameter RC or a difference RD-RB of <=6 μm between 50% particle diameter RB and 95% particle diameter RD. The solid powder cosmetic is prepared by mixing inorganic or organic powder as a main component with a proper amount of an oil or a surfactant as a binder and then molding the mixture by a compression molding method, or the like, and has a shape, concretely a medium-sized dish-like shape, a mass-like shape, a pencil-like shape, a stick-like shape, or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid powder cosmetic for skin in which a powder and a binder are molded into a solid form, and more particularly, it has excellent moldability and impact resistance, and has excellent peelability and spreadability during use. The present invention relates to a solid powder cosmetic which is good, has excellent durability and makes wrinkles less noticeable.

[0002]

2. Description of the Related Art Conventionally, metal soaps have been blended in solid powder cosmetics such as foundations, blushers, eye shadows, etc. in order to enhance powder binding properties and improve moldability and impact resistance. Here, the solid powder cosmetic according to the present invention is a cosmetic which is formed into a solid by compression molding or the like by mixing an appropriate amount of an oil or a surfactant as a binder with an inorganic or organic powder as a main component. The specific form of the product is, for example, a powder in a medium dish, a lump, a pencil, a stick, and the like. However, in general, when a metal soap is blended, there is a drawback that not only the peeling at the time of use and the spread (extensibility) at the time of use are deteriorated, but also a rough feeling is obtained, and the feeling of use is deteriorated.

Therefore, Japanese Patent Application Laid-Open No. 59-93013 discloses
JP-A-60-126210 and JP-A-2-88
No. 512 discloses a cosmetic using spherical powder or polytetrafluoroethylene powder, which has improved spreadability and improved powder binding, and JP-A-6-305935 discloses a metal soap. Japanese Patent Application Laid-Open No. Hei 7-89825 discloses cosmetics in which talc coated with alkyl-modified silicone or glycerol-modified silicone is combined with silicone oil, and the like. In addition, the adhesiveness to the skin was not sufficient, and the makeup was easily disintegrated due to long-term use, so that the initial state of use could not be maintained, and it was difficult to make wrinkles less noticeable naturally.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, and is excellent in moldability and impact resistance, good in removal and spreadability in use, excellent in sustainability, and capable of making wrinkles inconspicuous. It is intended to provide a powder cosmetic.

[0005]

As a result of repeated studies to solve the above-mentioned problems, a desired solid powder cosmetic was obtained by using a specific amount of metal soap fine particles having a specific particle size distribution. That is, the present invention provides a 30% particle size _RA and 7%.
The difference R _C -R _{A from} 0% particle size R _C is 3 μm or less or 50%
Is a solid powder cosmetic, characterized in that the difference between R _D -R _B of the particle diameter R _B and 95% particle diameter R _D contains 1 to 70 wt% metal soap particles is 6μm or less.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The metal soap fine particles used in the present invention are polyvalent metal salts of fatty acids. Examples of the fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, and behenic acid. Palmitic acid and stearic acid. Examples of the polyvalent metal atom include magnesium, calcium, zinc, aluminum, iron and the like, preferably magnesium, calcium and zinc. The difference R _C -R _A between the 30% particle size _RA and the 70% particle size _RC is 3 μm or less, or the difference between the 50% particle size R _B and 95%.
% Particle diameter difference R _D -R _B and R _D is at 6μm or less, and preferably is 3μm or less R _C -R _A is 2μm or less, or R _D -R _B. R _C -R _A is greater than 3 μm or the difference R _D-
Taking R _B is in use and 6μm larger, also weakens both wrinkle concealing effects spreadability and durability is deteriorated.

Here, the term "30% particle diameter _RA" means that 30% of the particles in the total weight of the metal soap particles are smaller than the particle diameter. For example, stearic acid which is a general metal soap shown in FIG. 30% of the cumulative (%) in the graph of the cumulative particle size of zinc
The particle size of 3.2 μm is defined as _RA . R _B ,
_RC and _RD are similarly defined, and are 5.3 μm and 8.
3 μm and 19.6 μm. Therefore R _C -R _A and R
_D -R _B consists respectively 5.1 .mu.m, and 14.3Myuemu.
That is, the lower the respective values of R _C -R _A and R _D -R _B , the narrower the range of the particle size distribution.

Incidentally, a general particle size distribution measuring method is used for measuring the particle size distribution. For example, sieving, sedimentation, microscopy, light scanning, laser diffraction scattering, and the like are mentioned. In the method of measuring metal soap fine particles used in the present invention, measurement is performed on finer particles with high accuracy. An optical scanning method, a laser diffraction scattering method, and the like, which can perform the above, are preferably used. In the metal soap fine particles used in the present invention, the content of the particles having a particle size larger than 10 μm is preferably 4% or less, more preferably substantially no particle particles having a particle size larger than 10 μm.

The metal soap fine particles of the present invention are generally prepared as follows. That is, a crystal transition of a metal soap that produces an aqueous solution containing 0.001 to 20% by weight of an alkali metal salt or an ammonium salt of a fatty acid and an aqueous solution or dispersion containing 0.001 to 20% by weight of an inorganic metal salt. A metal soap slurry is prepared by mixing at a temperature equal to or lower than the starting temperature, and then the slurry is subjected to a drying treatment at a temperature equal to or lower than the crystal transition starting temperature of the metal soap. Here, the crystal transition onset temperature is a temperature at which the crystal structure of the metal soap starts to change. For example, in the heat absorption graph of the general differential thermal analysis of zinc stearate in FIG. The temperature at the intersection C between the extension line A of the above and the extension line B of the gradient after the endothermic start is defined as the crystal transition start temperature. For example, the temperature is 100 ° C. for zinc stearate, 94 ° C. for calcium stearate, and 73 ° C. for magnesium stearate.

[0010] The metal soap fine particles as a component of the present invention are 1 to 70% by weight, preferably 3 to 60% by weight, more preferably 5 to 50% by weight based on the total amount of the solid powder cosmetic. If the amount is less than 1% by weight, not only the moldability and impact resistance are deteriorated, but also the effect of making the wrinkles inconspicuous is weak and the durability is liable to be deteriorated. Become.

The solid powder cosmetic of the present invention can be blended with conventionally known components used in cosmetics. For example, talc, kaolin, sericite, mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, strontium silicate, barium sulfate, metal tungstate, silica, zeolite, Inorganic powders such as hydroxyapatite, boron nitride and ceramic powder; organic powders such as crystalline cellulose, polyethylene powder and polytetrafluoroethylene powder; inorganic white pigments such as titanium oxide and zinc oxide; red iron oxide (red iron oxide); titanic acid Inorganic red pigments such as iron, inorganic brown pigments such as γ-iron oxide, inorganic yellow pigments such as yellow iron oxide and loess, inorganic black pigments such as black iron oxide and carbon black, mango violet, cobalt violet and the like Inorganic violet pigment, chromium oxide, Chromium oxide, inorganic green pigments cobalt titanate, ultramarine, inorganic blue pigments such as Prussian blue, titanium oxide-coated mica, oxychloride Bihimasu, titanium oxide-coated oxychloride Bihimasu, titanium oxide coated talc, fish scales,
Pearl pigments such as colored titanium oxide-coated mica, metal powder pigments such as aluminum powder and copper powder, red 2
No. 01, Red No. 202, Red No. 204, Red No. 205,
Red 220, Red 226, Red 228, Red 40
Organic pigments such as No. 5, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, Blue No. 404, Red No. 3, Red No. 104, Red No. 106, Red No. 227, Red No. 230
No. Red No. 401, Red No. 505, Orange No. 205, Yellow No. 4, Yellow No. 5, Yellow No. 202, Yellow No. 203, Green No. 3
No., Blue No. 1, etc., organic pigments such as zirconium, barium or aluminum lake, natural pigments such as chlorophyll, β-carotene, lower alcohols such as ethanol and isopropyl alcohol, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene Polyhydric alcohols such as glycol, polypropylene glycol, 1,3-butylene glycol, 1,2-pentanediol, glycerin, diglycerin, polyglycerin, sorbitol, and maltitol;
Carboxyvinyl polymer, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, xanthan gum, water-soluble polymers such as hyaluronic acid, liquid paraffin, liquid isoparaffin,
Hydrocarbon oils such as squalane, petrolatum, and solid paraffin; natural fats and oils such as jojoba oil, olive oil, castor oil, and sunflower oil; synthetic triglycerides such as glyceryl tri-2-ethylhexanoate; isopropyl myristate; isopropyl palmitate; and palmitic acid Ester oils such as cetyl, ethyl oleate, oleyl oleate, and octyl dodecyl myristate; waxes such as beeswax and carnauba wax; silicones such as linear and cyclic dimethylpolysiloxane, polyether-modified dimethylpolysiloxane, and amino-modified dimethylpolysiloxane Derivatives, cetyl alcohol, stearyl alcohol, oleyl alcohol,
Higher alcohols such as behenyl alcohol, protein derivatives, lanolin, lanolin derivatives, lecithin and other oily components, polyoxyethylene alkyl ethers, fatty acid esters of polyethylene glycol, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene hardened castor oil, Nonionic surfactants such as polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, glycerin monofatty acid ester, alkyl polyglucoside, alkanolamide, soap, alkyl sulfate salt, alkyl ether sulfate salt, α-olefin sulfonic acid Salt, acylmethyl taurine salt, acyl glutamate, acyl glycine salt, acyl sarcosine salt, alkyl ether carboxylate, amide Ether sulfates, anionic surfactants such as alkyl phosphate salts, alkyl betaines, amidopropyl betaines, amide amino acid salts,
Amphoteric surfactants such as alkyliminodiacetic acid salts, semipolar surfactants such as alkylamine oxides and polyoxyethylene alkylamine oxides, cationic surfactants such as alkyltrimethylammonium chloride and dialkyldimethylammonium chloride, alkylamines And salts of organic amines such as hydrochloride and acetate of amide and amidoamine, acids and alkalis as pH adjusters, bactericides, chelating agents, antioxidants, ultraviolet absorbers, natural extracts derived from animals and plants, fragrances and the like.

[0012]

Next, the present invention will be described in more detail by way of examples. Examples 1 to 7 and Comparative Examples 1 to 5 Solid powder cosmetics as powder foundations shown in Table 3 were prepared using metal soap fine particles shown in Table 1 and molded into a medium plate, and evaluated by the following method. Done. However,
As the additive components, the seven components shown in Table 2 were used as common additive components. Table 3 shows the results. In addition, the particle size distribution of the metal soap fine particles in Table 1 was measured as follows. That is, 10 ml of ethanol was added to 0.5 g of metal soap fine particles, and ultrasonic dispersion was performed for 5 minutes using an ultrasonic disperser manufactured by Nippon Seiki Co., Ltd. Next, the obtained metal soap dispersion was added to a Nikkiso Co., Ltd. Microtrac particle size distribution analyzer (SPA type) circulating ethanol as a measurement solvent until the DV value became 0.6 to 0.8, The particle size distribution of each sample in this state was measured.

[0013]

[Table 1]

[0014]

[Table 2]

[0015]

[Table 3]

(1) Removal at the time of use 20 women (20 to 35 years old) were used as panelists, and the removal at the time of using solid powder cosmetics was determined as follows, and the average value of the 20 women was determined. Thus, an average value of 1.5 or more was evaluated as a cosmetic that had good removal during use. 2 points: When a sufficient amount of cosmetics can be taken at one time at the time of use, and it feels good to remove. 1 point: When the amount that can be taken at one time during use is somewhat small, and the removal is somewhat bad. 0 point: The amount that can be taken at one time during use is small, and it is felt that the removal is poor.

(2) Spreadability Twenty women (20 to 35 years old) were used as panelists, and the elongation when using the solid powder cosmetics was determined as follows. An average value of 1.5 or more was evaluated as a cosmetic having good spreadability (spreadability) during use. 2 points: If you feel that the spread during use is good. 1 point: When the user feels that the spread during use is somewhat poor. 0 point: When the user feels that the spread during use is poor.

(3) Sustainability Twenty women (20 to 35 years old) were used as panelists, and the condition of the skin 4 hours after using the solid powder cosmetic was determined as follows. An average value was obtained, and an average value of 1.5 or more was evaluated as a cosmetic that was hard to be broken down and had good makeup lasting (persistence). 2 points: When it is felt that makeup collapse has not occurred. 1 point: When the user feels that the makeup has slightly collapsed. 0 point: When it is felt that makeup collapse has clearly occurred.

(4) Wrinkle concealing effect Twenty women (20 to 35 years old) were used as panelists, and the condition of the skin when the solid powder cosmetic was used was determined as follows, and the average value of the 20 women was determined. The average value of 1.5 or more was evaluated as a cosmetic having a high wrinkle hiding effect. 2 points: When wrinkles are clearly felt to be inconspicuous. 1 point: When wrinkles are felt to be slightly inconspicuous. 0 point: When the wrinkle hiding effect was felt to be weak.

As can be seen from Examples 1 to 7, the powder foundations of the present invention are all excellent in moldability and impact resistance, good in removal and spreading during use, excellent in sustainability, and have less noticeable wrinkles. Was. On the other hand, Comparative Examples 1 to
5, sufficient performance was not obtained. That is, Comparative Example 1
Since the metal soap fine particles as the component of the present invention are not blended, the persistence is poor and the wrinkle hiding effect is weak, and in Comparative Example 2, the metal soap fine particles as the component of the present invention fall within the scope of the present invention. Exceeding the blending results in poor peelability and spreadability during use. In Comparative Examples 3, 4 and 5, metal soap particles or organic resin powders outside the scope of the present invention were added instead of the metal soap fine particles as the component of the present invention. Not only is the removal and spreadability poor, but also the persistence is poor and the wrinkle hiding effect is weak.

Example 8 A solid powder cosmetic, which is a cake-like foundation shown in Table 4, was prepared using metal soap fine particles shown in Table 1 and molded into a middle plate, followed by the method described in Example 1. An evaluation was performed.

[0022]

[Table 4]

As can be seen from Example 8, the cake-like foundation of the present invention was excellent in moldability and impact resistance, good in removal and spreadability in use, excellent in sustainability, and made wrinkles less noticeable.

Example 9 A solid powder cosmetic as a body powder shown in Table 5 was prepared using the metal soap fine particles shown in Table 1 and molded into a middle plate, and evaluated by the method described in Example 1. Was performed.

[0025]

[Table 5]

From Example 9, it was found that the body powder of the present invention was excellent in moldability and impact resistance, good in removal and spreadability in use, excellent in sustainability, and made wrinkles less noticeable.

Example 10 The solid powder cosmetics of rouge shown in Table 6 were prepared using the metallic soap fine particles shown in Table 1 and molded into a medium dish.
Were evaluated by the method described in the above section.

[0028]

[Table 6]

From Example 10, the blusher of the present invention has moldability,
It had excellent impact resistance, good peelability and spreadability during use, excellent durability, and made wrinkles inconspicuous.

Example 11 A solid powder cosmetic as an eye shadow shown in Table 7 was prepared using metal soap fine particles shown in Table 1 and molded into a medium dish.
Evaluation was performed by the method described in Example 1.

[0031]

[Table 7]

As can be seen from Example 11, the eye shadow of the present invention was excellent in moldability and impact resistance, good in removal and spreadability in use, excellent in sustainability, and made wrinkles less noticeable.

[0033]

EFFECT OF THE INVENTION The solid powder cosmetic of the present invention has excellent moldability and impact resistance, and has good peelability and spreadability during use.
It has excellent sustainability and has the effect of making wrinkles less noticeable.

[Brief description of the drawings]

FIG. 1 is a graph showing a particle size distribution and a particle size accumulation of zinc stearate which is a general product of a metal soap.

FIG. 2 shows the results of differential thermal analysis of zinc stearate, which is a general metal soap.

Claims (1)

[Claims] 1. The difference R between the 30% particle size R _A and the 70% particle size R _C.
Solid _{forms C} -R _A, characterized in that the difference R _D -R _B of 3μm or less or 50% particle size R _B and 95% particle diameter R _D containing 1 to 70 wt% metal soap particles is 6μm or less Powder cosmetics.