JPH02207014A - Makeup composition and production thereof - Google Patents

Abstract

PURPOSE:To obtain a makeup composition, excellent in dispersibility and good in feeling of use and further transparency and capable of giving more aesthetic makeup without causing precipitation or flocculation, discoloration and deterioration by blending a cosmetic base with ultrafine particulate magnetite having a uniform particle diameter. CONSTITUTION:A makeup composition obtained by blending 100 pts.wt. cosmetic base with 0.01-40 pts.wt. ultrafine particulate magnetite containing >=92.5wt.% ultrafine particles having a particle diameter within the range of 50-350Angstrom as a transparent iron oxide-based pigment. The above-mentioned ultrafine particulate magnetite is prepared by adding a basic solution to an aqueous solution containing a soluble ferrous salt and a soluble ferric salt, forming a sol of a positive transparent hydrated iron oxide having <=300Angstrom average particle diameter within an acidic region, aging and stabilizing the sol at >= ambient temperature, then adding a surfactant, flocculating the sol, subsequently adding an organic dispersion, passing the afore-mentioned sol into an organic layer, separating the organic layer, adding water thereto, adding a basic aqueous solution thereto while heating and stirring the mixture at >=50 deg.C and regulating the pH to >=9.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Application of Tojo The present invention relates to a cosmetic composition containing as a pigment ultrafine magnetite particles that are extremely easily dispersed in water.

(b) Conventional technology Many black pigments have been known in the past, but
The most representative of these is iron! (triiron tetroxide) and carbon black.

Among these black pigments, carbon black produces carcinogenic substances such as pentsupyrene during its manufacturing process, and safety and health problems have been pointed out when using this in cosmetic compositions.

In addition, when carbon black is used as a black pigment in cosmetic compositions, it is generally difficult to use carbon black due to differences in specific gravity with other powders such as talc that are blended at the same time as these pigments, and differences in the hydrophilicity and lipophilicity of the powder surface. It has disadvantages such as poor dispersibility and, in the worst case, agglomeration. Also,
Similarly, cosmetic compositions containing these pigments spread,
They tend to cause problems such as poor spreading and a rough texture, and furthermore, when applied to the skin, these pigments and other powders separate, resulting in color separation. .

Therefore, ultrafine particle magnetite has attracted attention and is being considered as a safe pigment for cosmetic compositions.

Conventional cosmetic compositions using ultrafine magnetite as a black pigment include the following.

That is, the cosmetic base material contains ultrafine magnetite particles having an average particle size of 10 to 300 particles and surface-treated with one or more anionic surfactants.

(Japanese Unexamined Patent Publication No. 61-289012).

(c) Problems to be Solved by the Invention However, the average particle size of these particles varies widely from 10 to 300, but this includes particles from extremely small to extremely large. , there are issues described below.

That is, if the particle size of ultrafine magnetite is less than 50,
Particles that are too small are active and unstable and can be oxidized, causing discoloration and deterioration.In addition, if the particles are too small, they physically bond with each other, resulting in the particles becoming large and agglomerating. Dispersibility deteriorates, and in addition, these fine particles get into the hair roots, making cleaning performance during hair removal considerably worse.On the other hand, if the particle size exceeds 350,
If the particles are too large, the dispersibility will be poor, and the spreadability and spreading of the cosmetic composition will be poor, and it will also tend to cause problems such as a rough feeling when used.Furthermore, as a result of a decrease in transparency, makeup smudges. There are problems such as poor color and dull appearance.

However, as with conventional products, the average particle size is wide, ranging from 10 to 300, and even with this product, even if the average particle size is in this range, the particle size distribution is even wider, so the particle size is 5.
More than a few dozen percent of the respondents are people other than 0 to 350, and this has many of the disadvantages mentioned above.

In view of the above problems, the present invention uses ultrafine magnetite particles with uniform particle size as a dispersoid, has extremely good dispersibility, does not cause sedimentation or agglomeration, and is stable and does not undergo discoloration or deterioration. A cosmetic composition that has good cleansing properties during cleansing, has good spreading and spreadability, has an excellent feeling of use, has good transparency, and has good makeup application, and its production. The purpose is to provide a method.

(d) Means for Solving the Problems The present inventors have made extensive studies to solve the above problems, and have obtained the following knowledge.

That is, a basic aqueous solution is added to a solution containing a soluble ferrous salt and a soluble ferric salt to form ultrafine magnetite particles all at once, and then unsaturated fatty acid salts are added to the surface of the ultrafine magnetite to form ultrafine particles. It has been found that if magnetite is coated with an unsaturated fatty acid, the particle size of the ultrafine magnetite particles varies widely, and therefore a desired cosmetic composition cannot be obtained.

So 1. @! In producing easily water-dispersible MVA particle magnetite using fine particle magnetite as a dispersoid, a basic aqueous solution is added in two steps, and in the first step, pll is suppressed to reduce the average particle size to 300 Å or less in the acidic region. After preparing a transparent and positive hydrated iron oxide sol, the particle size of the sol surprisingly becomes uniform when it is aged, and then a basic aqueous solution is added to it (second step). p
By setting ll to 9 or more, the particle size range is 50 to 350.
We have obtained the knowledge that human ultrafine particle magnetite can be obtained in a proportion of 95% by weight or more, and that this ultrafine particle magnetite has excellent dispersibility, is stable, and is extremely excellent as a pigment for cosmetic compositions. .

Furthermore, according to the experimental results of the present inventors, it was found that there is no practical problem as a cosmetic composition even if the content of ultrafine magnetite particles outside the above particle size range is less than 7.5% by weight.

The present invention has been completed based on the above findings.

That is, the cosmetic composition of claim 1 of the present application is a cosmetic composition comprising a cosmetic base material and a transparent iron oxide pigment, wherein the transparent iron oxide pigment is ultrafine particle magnetite, and the ultrafine particle magnetite is a cosmetic composition comprising a cosmetic base material and a transparent iron oxide pigment. is characterized by containing 95% by weight or more of ultrafine particle magnetite with a particle size range of 50 to 350 particles.

The cosmetic base used in the present invention is particularly limited as long as it is used for cosmetic purposes, and is used as a cosmetic composition with a black or brown pigment added. It is not particularly limited.

Specifically, the following can be mentioned, for example.

(b) Eye shadow, such as liquid, cream, stick, etc. (b) Eyebrow paint, such as liquid, stick, etc. (c) Mascara, such as liquid, cream, stick, cake, etc. (d) Eyeliner, e.g. liquid , rod-shaped, etc. And in the present invention, the cosmetic base material contains a transparent iron oxide pigment, and the transparent iron oxide pigment is ultrafine particle magnetite, and the ultrafine particle magnetite is It is characterized by containing 92.5 weight 1% or more of ultrafine particle magnetite with a particle size range of 50-350.

If the particle size range of the above ffi fine particle magnetite is less than 50A, the particles will become too active and unstable, and will be oxidized in the air, causing discoloration and deterioration. As a result of the particles becoming large and agglomerating, the dispersibility becomes poor, and in addition, these fine particles get into the hair roots, making cleaning performance during cleansing significantly worse.On the other hand, the particle size If the number exceeds 350, the particles are too large and the dispersibility becomes poor, and the spreadability and spreading of the cosmetic composition deteriorates, and it tends to cause problems such as a rough feeling when used, and the transparency further decreases. As a result, the makeup looks bad and dull, which is not desirable.

However, it has been confirmed that the above-mentioned ultrafine particle magnetite does not need to be 100% by weight within the above particle size range, and even if it contains less than 7.5 mfi% of particles outside this range, there will be no problem in terms of disaster prevention. It was done.

By the way, the above-mentioned ultrafine particle magnetite is coated with a surfactant in order to improve its dispersibility, but this surfactant does not irritate the skin (there are no particular restrictions if it is safe). However, those added to foods or cosmetics are most preferred.

Then, the cosmetic base material (A) and the ultrafine particle magnetite (B
) is preferably in the range of 0.01 to 40 parts by weight of (B) to 100 parts by weight of (A), and if the content of (B) is less than 0.01 parts by weight, A cosmetic composition of the required color cannot be obtained; on the other hand, 40if
If it exceeds i parts, it is not only meaningless but also disadvantageous from an economic point of view.

In the present invention, in ffi fine particle magnetite, its particle size range and content within the required range are determined by preparing Mi image particle magnetite, collecting 1 g of it, sufficiently dispersing it in 300 tal pure water using ultrasonic waves, and dispersing it in a scanning type. It was calculated using an electron microscope and by counting and processing with a combinator.

The cosmetic composition of the present invention can be produced by the manufacturing method described below.
Produced continuously and economically.

Next, the cosmetic MA composition of Claim 2 will be explained in detail.

The cosmetic composition of the present MIllI claim 2 is characterized in that, in the above-mentioned cosmetic composition, the ultrafine magnetite particles contain a stabilizer.

That is, this cosmetic composition is the same as the cosmetic composition of claim 1 except for the addition of a stabilizer, and therefore, other explanations will be omitted.

The stabilizer mentioned above may be either an organic compound or an inorganic compound as long as it is a cationized compound at the neutralization isoelectric point (pH) of ferrous and ferric ions (although there are no particular limitations). This stabilizer electrostatically binds to the surface of the negatively charged ultrafine particle magnetite and stabilizes the ffi fine particle magnetite.

Examples of the above-mentioned stabilizers include soluble aluminum salts, soluble zinc salts, soluble orthosilicates, soluble orthosulfates, erythrobic acid, gallic acid, amino acids, reguctone M (ami/reductone M), tin, antimony, titanium,
Soluble salts of norconium, niobium, etc., phenyl β-su7
Examples include amines such as thylamine, phosphorus compounds such as notiophosphoric acid, and alkylaminocarponeroacetic acid.

The cosmetic composition of the present invention can be manufactured continuously and economically by the 91 manufacturing method described below.

Next, the invention according to claim 3, that is, the method for producing the cosmetic composition according to claim 1 will be described in detail.

In the present invention, a basic aqueous solution is added to an aqueous solution containing a soluble ferrous salt and a soluble ferric salt to prepare a transparent and positive hydrated iron oxide sol with an average particle size of 300 A or less in an acidic region. (A).

The soluble ferrous salt used in the present invention is not particularly limited as long as it is soluble in water or hot water. Specifically, ferrous chloride, ferrous bromide, etc. Examples include iron, ferrous iodide, ferrous perchlorate, ferrous sulfate, ferrous nitrate, ferrous acetate, and ammonium iron sulfate.

Further, the soluble ferric salt used in the present invention is not particularly limited as long as it is soluble in water or hot water, and specifically, for example, 7-/ferric chloride. , ferric chloride, ferric perchlorate, ferric bromide, ferric sulfate, nitrate I
l! ! Ferric iron, ferric thiocyanate, ferric oxalate,
Examples include ferric ammonium sulfate and ferric potassium sulfate.

The concentrations of the soluble ferrous salt aqueous solution and the soluble ferric salt aqueous solution are both 0.1 to 5 m.

It is preferable to set it in the range of 1/1. This concentration is 5mo
If it exceeds 1/R, it is not preferable because turbidity may occur or the particle size distribution may expand; on the other hand, 0, 1
If the mol/ is less than 12, the concentration becomes too dilute, resulting in a lack of mass productivity and being extremely uneconomical.
The molar ratio is not particularly limited, but when used as a black pigment, (a) is 1 to b) is 0.7) 1.3
It is preferable to set it as the range of 1. Outside this range, stable ultrafine particle magnetite cannot be obtained, and it is not desirable because the saturation magnetization and the degree of blackness are low.

Examples of the basic aqueous solution include aqueous solutions of alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, carbonate aqueous solutions such as potassium carbonate, hydrogen carbonate, and hydrogen carbonate. Examples include aqueous solutions of hydrogen carbonates such as potassium and 7 ammonium hydrogen carbonate, and aqueous ammonia.

In addition, the concentration of the basic aqueous solution is 0.5-5 m
o1/1 is preferable; if it exceeds 5 mol/l, the concentration is too high and it becomes difficult to adjust pl+;
On the other hand, if it is less than 5 mol/1, the concentration will be too thin and the amount of liquid will be too large, which will increase the size of the reactor and make handling difficult.

When preparing a sol of hydrated iron oxide by adding a basic aqueous solution to the aqueous solution containing the above-mentioned soluble ferrous salt and soluble ferric salt and allowing them to react, the sol is prepared in an acidic region, usually at pH 1 to 4.
It is preferable to carry out the process in the range of 5. If the alkaline desired range is reached, ultrafine particle magnetite will be generated all at once, and it will be difficult to make the particle size uniform even in the post-process ripening. , which is undesirable.

By the way, if the pH is less than 1, the pH becomes too high and it may be difficult to completely obtain a sol of hydrated iron oxide.
．． When you answer 5, ultrafine particle magnetite is generated all at once.
It is difficult to make the particle size uniform during the post-ripening process, which may be undesirable from the viewpoint of dispersibility and quality stability. is desirable.

In the present invention, the step (B) of aging and stabilizing the hydrated iron oxide sol obtained in the above step (A) at room temperature or higher is carried out.

Then, the particle size and shape of the hydrated iron oxide sol obtained in this step (B) become the size and shape of the ultrafine particle magnetite, and therefore, when preparing the ultrafine particles in this step (A), the aging temperature is and maturing time is required.

The temperature for this ripening may be room temperature or higher, but specifically, a temperature range of 20 to 450°C is preferable. If the temperature exceeds 450°C, the apparatus becomes complicated, which is not preferable.

In this case, an autoclave may be used when the aging temperature exceeds 100°C.

Further, although the aging time varies depending on the temperature, it is preferably adjusted to a range of 1 to 24 hours from the viewpoint of productivity, economy, etc.

By aging in this way, the particle size range is 50 to 35.
A sol of hydrated iron oxide of 0.0% is obtained in a proportion of 95% by weight or more.

In the present invention, a step (C) is carried out in which a primary surfactant is added to the dispersion obtained in step (B) to aggregate a sol of hydrated iron oxide.

Examples of the primary surfactant include sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, sodium caproate, sodium caprylate, sodium ricinoleate, sodium laurate, sodium oleate, sodium alkylnaphthalene sulfonate, or Anionic surfactants of the phosphate ester salt type, such as higher alcohol phosphate monoester disodium salts,
Anionic surfactants such as higher alcohol phosphoric acid noester sodium salts, fatty acids such as oleic acid, linoleic acid, ricinoleic acid, hexaoleic acid, lauric acid, palmitic acid, myristic acid, stearic acid, and low polymerization degree polycarbonate Acid salts, such as low polymerization degree sodium polyacrylate, low polymerization degree polybutyl acrylate, low polymerization degree polysodium methacrylate, casein or its alkali metal salt, amino acid or its derivative, 7-7carboxylic acid or its alkali Examples include metal salts, hydroquine carboxylic acid or its alkali metal salts, and surfactants such as sulfonated polystyrene represented by the following general formula (%), sodium dioctyl sulfosuccinate, polyoxyethylene oleyl ether, etc. Among these, it is particularly preferable to use higher unsaturated fatty acids or their alkali metal salts, sodium fulkylsulfosuccinates such as sodium dioctylsulfosuccinate, and polyoxyfulkylene oleyl ethers such as polyoxyethylene oleyl ether.

In this step (C), the concentration and amount of the primary surfactant aqueous solution to be added vary depending on the type of primary surfactant used, and are appropriately determined.

The concentration of the aqueous solution of the primary surfactant is 0.05
It is desirable that the concentration be in the range of ~1 mol/e, and if this concentration is less than 0.05 IIot'/1, the concentration will be too thin and mass productivity will be lacking.
If it exceeds 1, the concentration will become too high and there is a risk of adding an excessive amount of primary surfactant, which is not preferable since it requires considerable care in handling.

In addition, when adding the aqueous solution of the above primary surfactant to form a sol of hydrated iron oxide, the temperature is between room temperature and 250°C.
It is desirable that the range be within the range of .

In the present invention, an organic dispersion medium is added to a solution in which the hydrated iron oxide sol obtained in step (C) is aggregated, the sol is transferred to an organic layer and dispersed, and this is washed with water and desalted. Step (D) is carried out.

The organic dispersion medium used here is not particularly limited as long as it is insoluble in water. Good ester, kerosene, xylene, MEK, ethyl acetate, tetrahydro-7-lane, ethyl ether, ligroin, 2-pyrrolidone, alkylnaphthalene, turbine oil, fatty acid, vegetable oil and the like.

Further, in this step (D), the method of washing and desalting the sol of the organic layer does not require any special technique, and it is sufficient to repeat washing and separation and removal using water or hot water. .

In the present invention, the solution obtained in step (D) above is separated, the organic layer is collected, water is added thereto, and the temperature is increased to 50°C.
Heat at ℃ or higher and add basic aqueous solution while stirring to 011
Step (E) of obtaining ultrafine particle magnetite by increasing the particle size to 9 or more is carried out.

Examples of the basic aqueous solution used here include those similar to those mentioned above.

Then, by adding this basic aqueous solution to make it 0119 or higher, m'a particle magnetite is produced. This ultra-fine particle magnetite contains 95% by weight or more of particles in the range of 50 to 350 particles, has an extremely uniform particle size, has good dispersibility, and is of extremely high quality as a pigment for cosmetics. You can get it.

In the present invention, the solution obtained in step (E) above is washed with water, the aqueous layer is removed, and then step (F) of newly adding water is carried out.

Washing with water in this step (F) does not require any special technique or equipment, and can be carried out in the same manner as in step CD).

In the present invention, the step (G) of adding a secondary surfactant to the solution obtained in the above step (F) to transfer and disperse the ultrafine particle magnetite to the water layer, and then removing the organic dispersion medium;
Implement.

The secondary surfactant used here is not particularly limited as long as it is an anionic surfactant or a nonionic surfactant.

The anionic surfactant is not particularly limited, and specifically includes fatty acid soaps, alkali metal salts of furkyl sulfate or alkyl ether sulfates, ethylamine salts, flukylbenzenesulfonic acid, Examples include alkali metal salts thereof, noalkyl sulfosuccinic acid or alkali metal salts thereof, alkyl alkosinates, polycarboxylic acid or alkali metal salts thereof, and the like.

The above-mentioned nonionic surfactant is not particularly limited, and examples include ether type, furkylphenol type, ester type, sorbitan ester ether type, oxyethylene block polymer, oxypropylene block polymer, polyglycerin fatty acid ester, etc. .

In this step (G), water washing is performed as desired, and this water washing may be performed in the same manner as in the above step (D).

Also, there are 8! As a method for removing the dispersion medium, a method such as liquid separation or distillation of the organic layer may be employed.

In this way, water-easily dispersible m-fine particle magnetite can be obtained, but in this case, water, which is a dispersion medium, may be distilled under reduced pressure to concentrate it to a desired concentration.

Water easily dispersible m-fine particle magnetite is obtained through the above steps (A) to (G), and the ultrafine particle magnetite thus obtained has uniform particle size and good dispersibility.
Its production requires no filtration and has good productivity, and
It is neutral, ensures long-term quality stability, and is ideal as a pigment for cosmetic compositions.

In the present invention, finally, a step (!1) of adding and mixing the water easily dispersible ultrafine particle magnetite obtained in the above step (G) to a cosmetic base material is carried out.

Further, the cosmetic base material used in this step (H) is not particularly limited as long as it is used for cosmetic purposes, and specific examples thereof include those mentioned above.

In order to add and mix the water-readily dispersible ultrafine particle magnetite to a cosmetic base material, the ultrafine particle magnetite and the above cosmetic base material are placed in a stirring device such as a Ni-Goo, a high-speed mixer, or a ball mill. are uniformly stirred and mixed at the desired temperature.

In this case, the desired temperature is appropriately determined depending on the characteristics of the water-dispersible ultrafine particle magnetite and the cosmetic base material so that the cosmetic base material is uniformly mixed and the cosmetic base material does not deteriorate due to heat. Optimal temperature.

It was confirmed that the easily water-dispersible ultrafine particle magnetite obtained by the above method was well dispersed in the cosmetic base material described below.

Then, this water easily dispersible ultrafine particle magnetite is mixed alone into a cosmetic base material.

Then, the cosmetic base material (A) and the ultrafine particle magnetite (B
) is preferably in the range of 0.01 to 40 parts by weight of (B) to 100 parts by weight of (A), and if the content of (B) is less than o, oimIL parts, On the other hand, if the amount exceeds 40 parts by weight, it is not only meaningless but also disadvantageous from an economic point of view.

In this way, the cosmetic composition according to claim 1 of the present application can be obtained continuously and economically.

Next, the method for dispensing the cosmetic composition according to claim 4 of the present application will be explained in detail.

That is, the method for producing this cosmetic composition involves adding a basic aqueous solution to an aqueous solution containing a soluble ferrous salt and a soluble ferric salt to obtain a transparent, positive hydrated product with an average particle size of 300 Å or less in an acidic region. A step (A) of preparing an iron oxide sol, a step (B) of aging and stabilizing the hydrated iron oxide sol obtained in the above step (A) at room temperature or above, and a dispersion obtained in the above step (B). After adding stabilizer to the liquid,
Step (C) of adding a primary surfactant to aggregate the sol of hydrated iron oxide; Adding an organic dispersion medium to the solution of the sol of hydrated iron oxide obtained in the above step (C); transferred to the organic layer,
Step (D) of dispersing, washing with water, and desalting, distributing the solution obtained in the above step (D), collecting the organic layer, adding water to it, heating it at a temperature of 50 ° C. or higher, and stirring. Step (E) of generating ultrafine particle magnetite by adding a basic aqueous solution to make it 9H9 or higher, washing the solution obtained in the above step (E) with water, removing the aqueous layer, and then adding new water. Step (F), adding a secondary surfactant to the solution obtained in the above step (F) to transfer and disperse the H1-particle magnetite into the water layer, and then removing the organic dispersion medium (G); It consists of a step (H) of adding and mixing the water easily dispersible ultrafine particle magnetite obtained in the above step (G) to a cosmetic base material.

Il! of this cosmetic composition! This method is characterized in that, in the method for producing a cosmetic composition according to claim 3, a stabilizer is added in advance before adding the surfactant in step (C). A), step (B), and steps (D to H) are the same as those in claim 3 of the present invention, so their explanation will be omitted to avoid duplication.

The above-mentioned stabilizer may be either an organic compound or an inorganic compound as long as it is a compound that is cationized at ζ (pH) and isoelectrically neutralized with ferrous ions and ferric ions, and is not particularly limited. isn't it.

This stabilizer electrostatically binds to the surface of the negatively charged ultrafine particle magnetite, thereby stabilizing the ultrafine particle magnetite.

The above-mentioned stabilizers include those mentioned above.

Thus, Book 11i! In addition to the various properties of the cosmetic composition according to claim 1, a cosmetic composition having excellent stability, that is, the cosmetic composition according to claim 2, can be obtained.

The cosmetic composition thus obtained can be used in exactly the same way as conventional cosmetics.

(e) Effect The cosmetic composition of the present invention has the above-mentioned structure, uses ultrafine particle magnetite as its pigment, and the ultrafine particle magnetite has a particle size range of 50 to 350 particles.
Since it contains more than % by weight, it is stable and does not discolor or deteriorate.
In addition, the dispersibility is good, and in addition, the cleansing properties during cleansing are clearly good, and when the cosmetic composition is applied, it spreads well, and the feeling of use is good. It has good transparency and good makeup effect.

In the cosmetic composition of the present invention, by incorporating a stabilizer into the ultrafine magnetite particles, in addition to the above-mentioned effects, long-term stability is further improved.

Cosmetic composition of the present invention! l! ! In the production method, in order to produce the easily dispersible water-dispersible ultrafine particle Magnetai F, which has the above-mentioned structure and is used as this pigment, a basic aqueous solution is added in two stages, and in the first stage, 9H is added in an acidic region. After preparing a transparent, positive hydrated iron oxide sol with an average particle size of 300 Å or less, it is aged to adjust the particle size of the sol to the desired range, and then a basic aqueous solution is added to it. In addition (second stage FFf) by setting pif to the alkaline region, ultrafine particle magnetite with a particle size range of 50 to 350 can be obtained at a ratio of 95% by weight or more, and furthermore, this ultrafine particle magnetite has a low dispersibility. In addition to being excellent in appearance, it is stable and has extremely excellent effects as a pigment in cosmetic compositions and products.

In the method for producing a cosmetic composition of the present invention, when adding a primary surfactant to a dispersion of hydrated iron oxide sol and coagulating this sol, before adding this surfactant, in advance,
By adding a stabilizer, in addition to the above-mentioned effects, long-term stability is further improved.

(r) Examples Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

GL Preparation Example 1 Ferrous sulfate 1,2 mol/1 aqueous solution 11 and ferric sulfate 1.0 oe/II aqueous solution wL11 were mixed and stirred,
While keeping the liquid temperature at 30℃, add 2.5% to this mixed solution.
A transparent and positive hydrated iron oxide sol with an average particle size of 300 Å or less is prepared by dropping 11Io1/l of sodium carbonate until the pH becomes 2.8 (Step A).

After aging and stabilizing this sol at 30°C for 3 hours (step 13)
), 500 liters of oleic acid sorg (primary surfactant) of 0.25 O1/1 was added to this dispersion to form this hydrated iron oxide organosol (Step C), and then n -Hexane (organic dispersion medium) 300@j! is added, the hydrated iron oxide organosol is transferred and dispersed in the organic layer, and this is washed with water and desalted (Step D).

After that, this solution was separated, the organic layer was collected, 200 Ill of water was added to it, and it was transferred to a 21-7 flask equipped with a condenser, and heated and stirred at a temperature of 75°C for 20 hours.
Ultrafine particle magnetite is produced by gradually adding 1% sodium hydroxide fi400 pH to pH 10.5 (Step E).

After this reaction is completed, this solution is washed, the aqueous layer is removed, 300 ml of fresh water is added (step F), and lauryl, which is a secondary surfactant, is used to disperse and transfer the ultrafine particle magnetite to the aqueous layer. Sodium acid 30% by weight Q30@
Il was added with stirring. After H1 fine particle magnetite has migrated to the aqueous layer, the n-hexane layer is removed, the aqueous layer is ca-condensed under reduced pressure, and vacuum-dried at a temperature of 60°C. Fine particle magnetite was obtained (Step G).

The yield of this cosmetic black pigment was 97.5% by weight in terms of ultrafine magnetite particles.

The particle size range of this ultrafine magnetite particle included 97.51 fi% of particles from 50 to 350 particles, and it was found that the particle size was uniform and the dispersibility in water was good.

Production Example 2 In Example 1, after removing the aqueous layer of the solution obtained in steps (A-E), the solution was washed, and after removing the aqueous layer, it was washed with 300 r of fresh water.
al (Step F), and then add 30% by weight solution of sodium dodecylbenzenesulfonate, which is a secondary surfactant, in order to disperse and transfer the ultrafine magnetite particles to the aqueous layer.
0ml was added with stirring. Once the ultrafine magnetite particles have migrated to the aqueous layer, the n-hexane layer is removed, the aqueous layer is concentrated under reduced pressure, and vacuum-dried at a temperature of 60°C to obtain a water-easily dispersible cosmetic black pigment. Fine particle magnetite was obtained (Step G).

The yield of this cosmetic black pigment was 97.5% by weight in terms of ultrafine magnetite particles. Moreover, it was observed that the dispersibility in water was good.

Production Example 3 Ferrous chloride 1.2 mol/l aqueous solution 11 and ferric chloride 2 mol/e aqueous solution 8!11 were mixed and stirred, and while maintaining the liquid temperature at 20°C, 2,5a+o was added to this mixed solution.
1 pl of sodium hydroxide! By dropping it until the particle size reaches 2.2, a transparent positive hydrated iron oxide sol with an average particle size of 300 Å or less is produced [! (Step A).

After aging and stabilizing this sol at room temperature for 24 hours (Step B)
To this dispersion, 0.25 moi'/l of sodium ricinoleate (primary surfactant) 550+al was added to coagulate the hydrated iron oxide organosol (in step CL&, 300 ml of toluene (organic dispersion medium) was added to this). In addition, hydrated iron oxide ornosol is transferred and dispersed in the organic layer, which is washed with water and desalted (Step D).

Thereafter, this solution was divided into portions, the organic layer was collected, and 200 rml of water was added to it, transferred to a No. 21 flask equipped with a condenser, and 20% by weight of hydroxide was added while stirring at a temperature of 90°C. ) 400 ml of +7um aqueous solution was gradually added to produce ultrafine magnetite particles (Step E).

Add 300 ml of fresh water to this solution, and gradually add sodium dioctyl sulfosuccinate, a secondary surfactant, at 35 mN in a 30 wt% solution while stirring to transfer and disperse the ultrafine magnetite particles into the water layer. After that, 11-hexane was separated and removed, and the aqueous layer was concentrated under reduced pressure and further vacuum-dried at a temperature of 65° C. to obtain easily water-dispersible ultrafine particle magnetite, which is a black cosmetic pigment.

The yield of this cosmetic black pigment was 97.0 mf1% in terms of ultrafine magnetite particles.

The particle size range of the ultrafine magnetite particles was 98.2% by weight of 50 to 350 particles, and it was found that the particle size was uniform and the dispersibility in water was good.

Production Example 4 Ferrous sulfate 1, 2*ol/1 aqueous solution "al&" and ferric sulfate 1, Omo1/1 aqueous solution 11 were mixed and stirred, and while maintaining the liquid temperature at 25°C, 2.
5. A transparent and positive hydrated iron oxide sol with an average particle size of 300.8 or less is prepared by dropping 1/l of sodium carbonate until the pH becomes 3.0 (Step A).

After aging and stabilizing this sol at 30°C for 3 hours (Step B
), 500 mN of 0.25 mo1/V sodium oleate (primary surfactant) was added to this dispersion to coagulate the hydrated iron oxide ornosol (Step C), and then 11-hexane ( 300 ml of organic dispersion medium) is added to transfer and disperse the hydrated iron oxide Orga/Sol in the organic layer, which is then washed with water and desalted (Step D).

After that, this solution is separated and the result is 8! Collect the layer, add 200 ml of water to it, transfer it to a 31 flask equipped with a condenser, heat and stir at a temperature of 75°C, and add 350 ml of 20% by weight sodium hydroxide solution! Gradually add p
By setting H11,0, ultrafine particle magnetite is generated (Step E).

Add 300ml of water to this solution, and gradually add sodium nooctylsulfosuccinate as a secondary surfactant while stirring and gradually add a 30% solution by weight at 35pH to transfer the ultrafine magnetite to the water layer. , after dispersing,
+1-hexane was separated and removed, and the aqueous layer was concentrated under reduced pressure and vacuum-dried at a temperature of 65° C. to obtain easily water-dispersible ultrafine particle magnetite, which is a black cosmetic pigment.

The yield of this cosmetic black pigment was 97.0% by weight in terms of ultrafine magnetite particles.

The particle size range of the ultrafine magnetite particles was found to be uniform, with a particle size range of 98.2% from 50 to 350 particles, and good dispersibility in water.

Production Example 5 Ferrous sulfate 1.2 1/1 water soluble 8 pH and ferric sulfate 1
, Omo1/l aqueous solution 8pH was mixed and stirred, and while keeping the temperature of this liquid at 40°C, 2.5mol/l was added to this mixed solution.
A transparent and positive iron oxide hydrated sol with an average particle size of 300 Å or less is prepared by dropping sodium hydroxide (1) until the pH becomes 2.3.

After aging and stabilizing this sol at a temperature of 70°C for 1 hour, 0.
25a+of sodium oleate (surfactant) 500 soj! was added to make a hydrated iron oxide orgafsol, and then 2
Add 0% by weight aqueous sodium hydroxide solution (at a temperature of 80%
Heating and stirring at ~90°C, IJIII.

5) After generating ffi fine particle magnetite, remove the aqueous layer, add 300 ml of new water after washing, and add 30% by weight of sodium laurate g30 + l as a secondary surfactant to disperse and transfer to the aqueous layer. Added with stirring.

Once the ultrafine magnetite particles have migrated to the aqueous layer and are completely dispersed, the n-hexane layer is removed, the aqueous layer is concentrated under reduced pressure, and the aqueous layer is vacuum dried at a temperature of 65°C to form a water easily dispersible cosmetic black pigment. obtained ultrafine particle magnetite.

The yield of this cosmetic black pigment was 97.2% in terms of ultrafine magnetite particles.

The particle size range of the ultrafine magnetite particles was 97.5% by weight of 50 to 350 particles, and it was found that the particle size was uniform and that the dispersibility in water was good.

Preparation, Example 6 Ferrous ammonium sulfate (Mohr salt HFeSO, (NH
,)2SO,-6H2O)1 ,3w,O1/1 Water f
8wL11 Ferric ammonium sulfate (iron alumium)
(FeNH=(SQ,)z・12H2O)2.0mo
Except for using 1/1 aqueous solution 11, water-readily dispersible ultrafine particle magnetite, which is a cosmetic black pigment, was obtained in the same manner as in Example 1.

The yield of this cosmetic black pigment was 97.5% by weight in terms of ultrafine magnetite particles.

The particle size range of the ultrafine magnetite particles was found to be uniform, including 97.8% by weight of particles from 50 to 350 particles, and to have good dispersibility in water.

Production Example 7 Add 300 ml of new water to n-hexane ultrafine particle magnetite M prepared in Example 1 (steps A-E), and gradually add ultrafine particle magnetite while adding a 10% aqueous hydrogen peroxide solution at a temperature of 50°C. At the same time, 32 g of polyoxyethylene oleyl ether was added to obtain easily water-dispersible ultrafine particle magnetite, which is a brown cosmetic pigment.

The yield of this cosmetic brown pigment was 97.0% by weight in terms of ultrafine magnetite particles.

In addition, the particle size range of this ultrafine particle magnetite is 50 to 35
Contains 97.8% by weight of 0 people, and has uniform particle size.
Moreover, it was found that the dispersibility in water was good.

Production Example 8 In step C of Example 1, before adding the primary surfactant (sodium oleate), 0.0% was added as a stabilizer.
2moj'/l aluminum chloride water soluble 8!50OL11
Water-ready dispersible ultrafine particle magnetite, which is a cosmetic black pigment, was obtained in the same manner as in Example 1, except that aluminum ion charges were added to the surface of the hydrated iron oxide sol.

The yield of this cosmetic black pigment was 97.5% by weight in terms of ultrafine magnetite particles.

The particle size range of this ultrafine particle magnetite was found to be 98.0% by weight of 50 to 350 particles, uniform particle size, and good dispersibility in water.

91? L Example 9 In step C of Example 2, before adding the primary surfactant (sodium oleate), 0 as a stabilizer was added.
, 2 mol/1 aluminum chloride aqueous solution 500ml
Water-ready dispersible ultrafine particle magnetite, which is a cosmetic black pigment, was obtained in the same manner as in Example 2, except that aluminum ion charges were imparted to the surface of the hydrated iron oxide sol by adding .

The yield of this cosmetic black pigment was 97.8% by weight in terms of M1 particle magnetite.

In addition, the particle size range of this m-fine particle magnetite is 50 to 35
Contains 98.0% by weight of 0 people, and has uniform particle size.
Moreover, it was found that the dispersibility in water was good.

Production Example 10 In step C of Example 3, before adding the primary surfactant (sodium ricinoleate), 0 was added as a stabilizer.
, 2 mol/1 aluminum chloride aqueous solution 500e
Water-ready dispersible ultrafine particle magnetite, which is a cosmetic black pigment, was obtained in the same manner as in Example 3, except that al was added to impart a full minitum ion charge to the surface of the hydrated iron oxide sol.

The yield of this cosmetic black pigment was 97.8% by weight in terms of ultrafine magnetite particles.

In addition, the particle size range of this ultrafine particle magnetite is 50 to 35
Contains 97.0% by weight of 0 people and has uniform particle size.
Moreover, it was found that the dispersibility in water was good.

Production Example 11 In Step C of Example 4, before adding the primary surfactant (sodium oleate), 0 was added as a stabilizer.
, 2 wo1/1 aluminum chloride water soluble 8!500
Water-ready dispersible ultrafine particle magnetite, which is a cosmetic black pigment, was obtained in the same manner as in Example 4, except that mN was added to impart an aluminum ion charge to the surface of the hydrated iron oxide sol.

The yield of this cosmetic black pigment was 97.8% by weight in terms of m-fine particle magnetite.

In addition, the particle size range of this ultrafine particle magnetite is 50 to 35
Contains 98.3 weight 1% of 0 people's material, and has uniform particle size.
However, it was found that the dispersibility in water was good.

Production Example 12 In step C of Example 6, before adding the primary surfactant (sodium oleate), 0 was added as a stabilizer.
, 2 ll1 ol/1 aluminum chloride aqueous solution 500
A water easily disintegrable elongated particle magnetite, which is a black cosmetic pigment, was obtained in the same manner as in Example 6, except that m1 was added to impart an aluminum ion charge to the surface of the hydrated iron oxide sol.

The yield of this cosmetic black pigment was 97.8% by weight in terms of IR image particle magnetite.

In addition, the particle size range of this ultrafine particle magnetite is 50 to 35
Contains 98.3% by weight of 0 people, and has uniform particle size.
Moreover, it was noted that the dispersibility in water was good.

Aqueous solutions of 1 wol/(l ferrous sulfate and 1 mail/l ferric sulfate) of super magnetite were placed in a reaction tank, and while mixing, a 13N NaOH aqueous solution was added dropwise until the pH reached 7.3. Thereafter, the ultrafine particle magnetite colloid solution was prepared by mixing for about 20 minutes, and then 640 ml of 10% sodium oleate solution was added and mixed for 30 minutes.
This coats the colloidal particles with a monolayer of sodium oleate.

Add 550m of kerosene, a non-aqueous organic solvent, to this solution.
When / is poured, a blackish brown organic layer is formed.

After the reaction was completed, the aqueous layer was removed, and after washing, 300 l of water was added again, and 30 l of a 30% by weight solution of sodium laurate was added as a secondary activator while stirring to disperse and transfer to the aqueous layer. Once the ultrafine magnetite particles have migrated to the aqueous layer, the n-hexane layer is removed, the aqueous layer is concentrated under reduced pressure,
Vacuum drying was performed at a temperature of 65° C. to obtain a water-dispersible ultrafine particle magnetite for comparative example, which is a black pigment for cosmetics.

This ultra-fine particle magnetite ranges in particle size from about 10 particles to more than 500 particles, and there are also fruits,
Furthermore, it was observed that there was a large variation in particle size.

This one has a particle size range of 50 to 350 people at 70.3
It contained 1% by weight of i.

40 g of water, 1,600 g of toluene, 1,600 g of sodium hydroxide, 14. 011 (0,349 mackerel 01) was added sequentially, and while stirring, oleic acid 96[1 (0
, 349 mol) was added and stirred for 30 minutes while keeping afA at 75-80°C, resulting in an emulsion containing sodium oleate.4 Next, the liquid temperature was lowered to 35°C,
534.3 g (8.8 mol) of 28% aqueous ammonia was added and mixed with stirring to obtain a uniform emulsion.

Meanwhile, 278 g (1 mol) of ferrous sulfate heptahydrate,
Ferric sulfate hexahydrate 508 g (1 mol), water 1125
A mixed aqueous solution of 1+ was dropped into the above-mentioned Nimarushin 5 to perform generation and adsorption treatment of ultrafine magnetite colloid. It took 2.5 hours to drop this aqueous iron salt solution. At the end of each drop, the reaction solution turned into a black dispersion, so the temperature of the solution was raised to 75-80°C and stirred at this temperature for 30 minutes.
Aged. After this, 5! The mixture was transferred to a liquid funnel and allowed to stand still. The toluene layer in which ultrafine magnetite colloids were dispersed was collected.

This toluene layer was transferred again to the 51-7 lasco and subjected to azeotropic hydrophilization.

After the reaction was completed, the aqueous layer was removed, and after washing, 300 grammes of fresh water was added, and 30 liters of 30% sodium laurate solution was added with stirring as a secondary activator to disperse and transfer to the aqueous layer. Once the magnetite has migrated to the aqueous layer, the 11-hexane layer is removed, the aqueous layer is concentrated under reduced pressure, and the temperature is 60°C.
The mixture was vacuum dried to obtain black water-dispersible ultrafine particle magnetite.

It was observed that the ffi image particle particle magnetite diameter ranged from about 10 particles to more than 500 particles, and there were also aggregates, and there was large variation in particle size.

This one has a particle size range of 50 to 350 people, 62.3
It contained 1% by weight.

2 of 1~
In Examples 14, all parts or % mean parts by weight or % by weight.

Examples 1 to 11 Using the black pigments obtained in Production Examples 1 to 6 and Production Examples 8 to 12, respectively, cosmetic compositions consisting of the following formulations were obtained by a known method (eyebrow ink).

Carnaubauro 8% Honey Crow
12% Mokuro
8% microcrystalline wax
10% Ceresin 10% Vaseline 7% Squalane
7% U7rin
5% ester 4% black ultrafine particle magnetite 29% Example 12 Using the brown pigment obtained in Production Example 7, a cosmetic composition consisting of the following formulation was obtained by a known method (solid eye shadow) .

Brown ultrafine particle magnetite 15% pearl agent
35% zinc stearate
8% kaolin 10
% Talc 21% Ester 5.5% Lanolin derivative
5.5% fragrance 0
．． 5% Example 13 Using the brown ultrafine particle magnetite obtained in Production Example 7, a cosmetic composition (cake-like mascara) consisting of the following formulation was obtained by the method described below.

Triethanolamine 54.0% Stearate Beeswax 6.2% Glyceryl Monostrate 6.2% Power Lunaubauro
18.0% U/phosphorus
7.6% brown ultrafine particle magnetite 3.0
% liquid paraffin 5.0% Mix and melt oil, fat and wax, add pigment and pass through a roller mill.

After R, the cosmetic composition of the present invention was obtained by pouring into a mold while melting and stirring.

Example 14 In the eyebrow ink of Example 1, brown ultrafine particle magnetite obtained in Production Example 7 was used in place of the black ultrafine particle magnetite of Production Example 1, and brown eyebrow ink (cosmetic composition) was prepared by a known method. ) was obtained.

Comparative Example 1 A cosmetic M acid (cake-like mascara) was obtained in the same manner as in Example 13 using the black ultrafine magnetite obtained in Production Example 1 of m-fine particle magnetite for comparison.

Comparative Example 2 A cosmetic composition (cake-like mascara) was obtained in the same manner as in Example 13 using the black ultrafine magnetite obtained in Production Example 2 of Ultrafine Particle Magnetite for Comparative Example.

The stability of each of the above Examples and Comparative Examples was investigated using the method described below.

m-... Judgment was made based on both the decrease in saturation magnetization after being left at a temperature of 60°C for one month and the change in color when left at a temperature of 60°C.

The results are shown in Table 1 and below (margins below) Table 1 Dispersibility: Immediately after production and after 2 months of being left at room temperature after production using a membrane filter with a replacement of 0.1μ to 1.0μ In order to examine the dispersibility, a filtration test was conducted under reduced pressure at 20 mmHg.

The sample used for filtration was prepared as an aqueous dispersion with a magnetite content of 20% by weight.

The results are shown in Table 2.

(Margin below) Table 2 ◎: Matsuna (no aggregates remain on the Menplan filter).

○: A slight amount of aggregate is observed on the membrane filter.

Δ: Aggregates clearly remain on the membrane filter.

x: Aggregates remain on the upper surface of the membrane filter.

As a result of investigating the dispersibility in cosmetic base materials, the products of each example had good affinity with the cosmetic base materials, were quickly dispersed throughout by stirring and mixing, and did not separate even after being left standing after dispersion. No abnormalities such as aggregation were observed.

On the other hand, those of each comparative example have compatibility with cosmetic base materials,
The dispersibility was poor, and abnormalities such as dispersion, segregation, agglomeration, and release were observed.

This large difference in dispersibility is considered to be due to particle dispersion.

As for stability, slight color change was observed in Examples 1 to 7 from around the 45th day, and no change was observed in Examples 8 to 12 (containing a stabilizer) for 60 days. ,
In each comparative example, color change was observed after about 7 days.

This difference in stability is thought to be due to the degree of variation in particle size.6 In other words, if the particles are too small, they become active and unstable, making them susceptible to discoloration and deterioration due to air oxidation. .

In particular, it has been found that cosmetic compositions using stabilizers have excellent long-term stability.

or,? ! The products of Example r have a clearly good cleansing property during cleansing, the cosmetic composition spreads and spreads well, and there is no strange feeling when using it, and the transparency is good and the makeup looks good. In contrast to the comparative examples, the cleansing properties of the comparative examples were noticeably poor, and the makeup did not come off. Furthermore, the cosmetic composition did not spread or spread well, and did not adhere well, making it difficult to use. It was observed that there was a strange feeling such as roughness when applying the product, and that the transparency was poor and makeup did not shine well and looked dull.

([1) Effects of the Invention Since the present invention is configured as described above, it produces effects as described below.

The cosmetic composition according to claim 1 has the above configuration,
Ultrafine particle magnetite is used as the pigment, and the f
Since fi fine particle magnetite F contains 92.5% by weight or more of particles with a particle size range of 50 to 350, it is stable and does not discolor or change in quality, and has good dispersibility. It has good cleansing properties, and the cosmetic composition spreads and spreads well, feels good on use, has good transparency, and has good makeup application. .

In the cosmetic composition of claim 2, by incorporating a stabilizer into the m-fine magnetite particles, in addition to the above-mentioned effects, long-term stability is further improved.

In the method for producing a cosmetic composition according to claim 3, in producing the easily dispersible water-dispersible ultrafine particle magnetite used as the pigment, the basic aqueous solution is added in two stages; In the step, the PLL is placed in an acidic region to prepare a transparent positive hydrated iron oxide sol with an average particle size of 300 Å or less, and then this is aged to adjust the particle size of the sol to the required range. Next, by adding a basic aqueous solution to this (ffi two steps) to bring the pll into an alkaline region, ultrafine particle magnetite with a particle size range of 50 to 350 particles can be obtained at a ratio of 95% by weight or more, and this ultrafine particle Magnetite has excellent dispersibility, is stable, and has extremely excellent effects as a pigment for cosmetic compositions.

The cosmetic composition of claim 4! ! ! In the method, when adding a primary surfactant to a dispersion of hydrated iron oxide sol and coagulating this sol, before adding this surfactant,
By adding a stabilizer in advance, long-term stability is further improved in addition to the above-mentioned effects.

Claims (4)

[Claims] (1) In a cosmetic composition comprising a cosmetic base material and a transparent iron oxide pigment, the transparent iron oxide pigment is ultrafine particle magnetite, and the ultrafine particle magnetite is ultrafine particle with a particle size range of 50 to 350 Å. A cosmetic composition comprising 92.5% by weight or more of magnetite. (2) The cosmetic composition according to claim 1, wherein the ultrafine magnetite particles contain a stabilizer. (3) A process of adding a basic aqueous solution to an aqueous solution containing a soluble ferrous salt and a soluble ferric salt to prepare a transparent and positive hydrated iron oxide sol with an average particle size of 300 Å or less in an acidic region (A
), A step (B) of aging and stabilizing the hydrated iron oxide sol obtained in the above step (A) at room temperature or above, A primary surfactant is added to the dispersion obtained in the above step (B), and water is added to the dispersion obtained in the above step (B). Step (C) of aggregating the hydrated iron oxide sol, adding an organic dispersion medium to the solution in which the hydrated iron oxide sol obtained in the above step (C) is aggregated, and transferring the sol to an organic layer;
Step (D) of dispersing, washing and desalting with water, separating the solution obtained in the above step (D), collecting the organic layer, adding water to this and heating at a temperature of 50 ° C. or higher, Step (E) of making ultrafine particle magnetite by adding a basic aqueous solution to pH 9 or higher while stirring, washing the solution obtained in the above step (E) with water, removing the aqueous layer, and then adding new water. Step (F): After adding a secondary surfactant to the solution obtained in the above step (F) and transferring and dispersing the ultrafine particle magnetite to the water layer,
A cosmetic composition comprising: a step (G) of removing an organic dispersion medium; a step (H) of adding and mixing the water easily dispersible ultrafine particle magnetite obtained in the above step (G) to a cosmetic base material; Production method. (4) A process of adding a basic aqueous solution to an aqueous solution containing a soluble ferrous salt and a soluble ferric salt to prepare a transparent and positive hydrated iron oxide sol with an average particle size of 300 Å or less in an acidic region (A
), A step (B) of aging and stabilizing the hydrated iron oxide sol obtained in the above step (A) at room temperature or above, After adding a stabilizer to the dispersion obtained in the above step (B),
Step (C) of adding a primary surfactant to aggregate the sol of hydrated iron oxide; Adding an organic dispersion medium to the solution of the sol of hydrated iron oxide obtained in the above step (C); transferred to the organic layer,
Step (D) of dispersing, washing and desalting with water, separating the solution obtained in the above step (D), collecting the organic layer, adding water to this and heating at a temperature of 50 ° C. or higher, Step (E) of producing ultrafine particle magnetite by adding a basic aqueous solution to pH 9 or higher with stirring; washing the solution obtained in the above step (E) with water, removing the aqueous layer, and adding new water; Adding step (F), after adding a secondary surfactant to the solution obtained in the above step (F) and transferring and dispersing the ultrafine particle magnetite to the water layer,
A cosmetic composition comprising: a step (G) of removing an organic dispersion medium; a step (H) of adding and mixing the water easily dispersible ultrafine particle magnetite obtained in the above step (G) to a cosmetic base material; Production method.