JP2023170248A - Magnetic iron oxide pigment with shape anisotropy for cosmetic composition, and method for producing the same, and cosmetic composition using magnetic iron oxide pigment - Google Patents

Abstract

To provide a magnetic iron oxide pigment for cosmetic compositions that is applied to skin, giving the user's face a three-dimensional impression, and is effortlessly removable when no longer required.SOLUTION: A magnetic iron oxide pigment has the value K of 1.50 or more and 3.90 or less, which is determined by dividing the coercivity (kA/m) at an external magnetic field of 397.9 kA/m by the specific surface area (m2/g). The specific surface area of the magnetic iron oxide pigment should be preferably 1.1 m2/g or more and 4.0 m2/g or less. The magnetic iron oxide pigment is blended in a cosmetic composition.SELECTED DRAWING: None

Description

Patent Act Article 30, Paragraph 2 application filed (1) Exhibition name/10th Cosmetic Industry Technology Exhibition CITE JAPAN 2021 Date/May 19th to May 21st, 2021 (2) Publication date Sun / May 19, 2021 Publication address / Titan Kogyo Co., Ltd. website (http://www.titankogyo.co.jp/randd/citejapan2021/) "3. Black iron oxide ABL" of "iron oxide type" Series” (http://www.titankogyo.co.jp/pdf/Octahedral_lron_Oxide_ABL_series.pdf) (3) Publication date/May 19, 2021 Publication address/Titan Kogyo Co., Ltd. website (http:/ /www.titankogyo.co.jp/randd/citejapan2021/) You Tube▲R▼ (https://www.youtube.com/watch?v=tAXCg7LwY7g) (4) Publication date/2021 10 Address on the 15th of the month / You Tube ▲ R ▼ (Japanese version: https: //www.youtube.com/watch? V = TERI_IPTZT8 English version: https: //www.youtube.com/watch? V = v KHXKKVQTFI ) (5) Publication date/November 24, 2021 Publication address/You Tube▲R▼ (Japanese version: https://www.youtube.com/watch?v=5vJInvLHqRg English version: https ://www.youtube.com/watch?v=e6gCSZcoMfs) (6) Sample provision date (shipping date)/ June 11, 2021 (Delivery date: June 14, 2021) Reiwa 3 June 15, 2021 (Delivery date: June 28, 2021) June 16, 2021 (Delivery date: June 28, 2021) June 23, 2021 (Delivery date : June 28, 2021) July 26, 2021 (Delivery date: August 3, 2021) August 3, 2021 (Delivery date: August 18, 2021) September 3, 2021 (Delivery date: September 9, 2021) September 16, 2021 (Delivery date: September 24, 2021) October 2021 26th (Delivery date: November 1, 2021) December 6, 2021 (Delivery date: December 8, 2021) Distribution location/Multiple locations including domestic and overseas countries that requested samples customers and intermediaries

The present invention relates to a magnetic iron oxide pigment having shape anisotropy used in cosmetic compositions, a method for producing the same, and a cosmetic composition using the same.

Cosmetics are often intended to give a healthy impression to the user, so they are generally associated with bright colors. Despite this, there is a great need for black pigments for cosmetics. Black pigments are used in hair dyes and body paints, but they are also often used in skin cosmetics. In recent years, it has become common knowledge that cosmetics tailored to a variety of skin types are needed, and cosmetics are often used as color adjusters. Furthermore, cosmetics that give a three-dimensional impression to the user, especially the face, are also one of the uses of black pigments.

When applying makeup, applying a uniformly bright tone to the entire face may give an unnatural impression. On the other hand, using dark-colored cosmetics to highlight the shadows around the cheekbones, eyes, lips, and surrounding areas not only gives a natural impression, but also makes the entire face look firmer, creating a ``small face.'' ” it looks like. This uses almost the same principle as the "flip-flop effect" defined by the Japan Society of Cosmetic Engineers. In order to achieve the above-mentioned dark color, a black pigment is required.

Conventionally, carbon black has been widely used as a black pigment. However, in recent years, the use of carbon black has been regulated in some countries and regions due to its effects on health. For this reason, pigments made of iron oxide are attracting attention as black pigments with higher safety. The present applicant also provided a high tinting power black iron oxide that can be used as a substitute for carbon black in JP 2016-000763 A (Patent Document 1).

However, due to its high coloring power, the high coloring power black iron oxide of Patent Document 1 tends to be darker than necessary in terms of giving a three-dimensional impression, and there is room for improvement. JP-A No. 2010-174003 (Patent Document 2) discloses a makeup cosmetic made of scaly glass with an average particle size of 5 to 30 μm and black iron oxide as a cosmetic that has the effect of clarifying the contours of eyes and eyebrows. is presented.

On the other hand, cosmetics using black pigments have a problem in that they are difficult to remove when they are no longer needed. In order to completely remove makeup using black pigments, there are problems such as it takes a long time to remove the makeup and the use of strong cleansing agents can cause skin irritation. Patent Document 2 does not mention anything about ease of dropping. In addition, the cosmetic of Patent Document 2 uses both scaly glass and iron oxide pigment, so there is a risk of color separation, and the applied area has a gloss, so depending on the situation of the user, It may give an unfavorable impression. JP-A-02-207014 (Patent Document 3) proposes a cosmetic composition using ultrafine particle magnetite that has extremely good cleansing properties during cleansing. However, Patent Document 3 makes no mention of three-dimensional impressions.

Japanese Patent Application Publication No. 2016-000763 Japanese Patent Application Publication No. 2010-174003 Japanese Patent Application Publication No. 02-207014

The present invention provides a cosmetic composition that gives a three-dimensional impression to the user's face, especially when applied to the skin, and that can be easily removed when no longer needed.

As a result of intensive study on the above-mentioned problem, the inventors found that the value K, which is the coercive force (kA/m) divided by the specific surface area (m ² /g) when the external magnetic field is 397.9 kA/m, is 1.50. A cosmetic composition that gives a three-dimensional impression to the user's face by blending a magnetic iron oxide pigment with a particle diameter of 3.90 or less, and that can be easily removed when no longer needed. We have discovered that it is possible to provide The present invention includes, but is not limited to, the following:
[1] Cosmetics whose value K, which is obtained by dividing the coercive force (kA/m) by the specific surface area (m ² /g) when the external magnetic field is 397.9 kA/m, is 1.50 or more and 3.90 or less Magnetic iron oxide pigments for compositions.
[2] The magnetic iron oxide pigment according to [1], which has a specific surface area of 1.1 m ² /g or more and 4.0 m ² /g or less.
[3] The magnetic iron oxide pigment according to [1] or [2], which has an oil absorption of 25 g/100 g or more and 40 g/100 g or less, and a bulk density of 0.25 g/mL or more and 0.36 g/mL or less.
[4] Reacting a ferrous salt aqueous solution with an alkali hydroxide to form a ferrous hydroxide slurry, and blowing an oxygen-containing gas into the ferrous hydroxide slurry under heating to form a ferrous hydroxide slurry. to oxidize,
The method for producing a magnetic iron oxide pigment according to [1] or [2], comprising:
The Fe concentration in the ferrous hydroxide slurry is 25 g/L or more and 35 g/L or less, and
The above production method, characterized in that alkali hydroxide is added in an amount such that the concentration of hydroxide ions (OH ⁻ ) that do not form ferrous hydroxide is 80 mmol/L or more and 240 mmol/L or less.
[5] An iron oxide pigment having a coating on the surface of the magnetic iron oxide pigment according to [1] or [2].
[6] A cosmetic composition containing the magnetic iron oxide pigment according to [1] or [2].
[7] The cosmetic composition according to [6], which is a skin cosmetic.

When incorporated into a cosmetic composition, the magnetic iron oxide pigment of the present invention can give a three-dimensional impression to the user's face by applying it to appropriate areas on the face, such as around the cheekbones. It is possible, and furthermore, it is possible to make the entire face look like a "small face".

Furthermore, since the cosmetic containing the magnetic iron oxide pigment of the present invention can be easily removed when it is no longer needed, it is possible to reduce the amount of time spent removing makeup, and it is also possible to use a cleansing agent. It is possible to reduce skin irritation by reducing the amount of skin used.

(Magnetic iron oxide pigment)
The magnetic iron oxide pigment of the present invention has a value K, which is the coercive force (kA/m) divided by the specific surface area (m ² /g) when an external magnetic field is 397.9 kA/m, is 1.50 or more and 3.90 It is as follows. Preferably, the specific surface area is 1.1 m ² /g or more and 4.0 m ² /g or less. The magnetic iron oxide pigment of the present invention is used for blending into cosmetic compositions.

Although the relationship between the value K of the magnetic iron oxide pigment of the present invention in the above range and the characteristics when the present magnetic iron oxide pigment is blended into a cosmetic composition is not clear, it is thought as follows. It will be done. The shape of the particles that make up the pigment greatly affects the intensity of reflected light, the color, the cohesive force, and the adhesion to the skin. Here, since the coercive force of iron oxide is generally strongly influenced by the particle shape and specific surface area, the value K, which is the coercive force divided by the specific surface area, functions as a parameter representing the degree of shape anisotropy of the particle. . The magnetic iron oxide pigment of the present invention, which has a value K within a certain range, has an intensity of reflected light that is moderate to the effect of giving a three-dimensional impression to the user's face and being easily removable. It can be said that it is within a certain range. The lower limit of the value K is more preferably 2.30 or more, still more preferably 2.40 or more, even more preferably 2.70 or more, and the upper limit is more preferably 3.50 or less. The specific surface area is measured by the BET single point method. The method for measuring coercive force will be described later.

The specific surface area of the magnetic iron oxide pigment is preferably 1.1 m ² /g or more and 4.0 m ² /g or less. A magnetic iron oxide pigment having a specific surface area within the above range tends to have coloring power, ease of penetration into skin dents, adhesion, and reflectance of incident light within an appropriate range for the effects of the present invention. The lower limit of the specific surface area is more preferably 1.5 m ² /g or more, and the upper limit is more preferably 3.5 m ² /g or less, even more preferably 3.0 m ² /g or less, even more preferably 2.6 m ² /g or less. It is.

The magnetic iron oxide pigment of the present invention preferably has an oil absorption of 25 g/100 g or more and 40 g/100 g or less. If the oil absorption amount is 25 g/100 g or more, the black pigment will be compatible with other materials in the cosmetic composition, and if it is 40 g/100 g or less, it will not be sticky and will be easy to apply uniformly. The lower limit of the oil absorption amount is more preferably 28 g/100 g or more, and the upper limit of the oil absorption amount is more preferably 35 g/100 g or less, even more preferably 32 g/100 g or less. The method for measuring oil absorption will be described later.

The magnetic iron oxide pigment of the present invention preferably has a bulk density of 0.25 g/mL or more and 0.36 g/mL or less. If the bulk density is 0.25 g/mL or more, the gaps between particles are small, so it is possible to prevent the color from becoming whitish, and if the bulk density is 0.36 g/mL or less, the texture will not be heavy and the texture will be uniform. Easy to apply. The lower limit is more preferably 0.26 g/mL or more, even more preferably 0.28 g/mL or more, and the upper limit is more preferably 0.34 g/mL or less, even more preferably 0.33 g/mL or less. The method for measuring bulk density will be described later.

The particles constituting the magnetic iron oxide pigment of the present invention preferably have an average particle diameter larger than 0.50 μm and smaller than 1.00 μm. If the average particle size is larger than 0.50 μm, the pigment will be less likely to remain in the depressions of the skin after washing, and if the average particle size is smaller than 1.00 μm, the pigment will feel good when applied to the skin. The lower limit is more preferably greater than 0.60 μm, and the upper limit is more preferably less than 0.80 μm. The method for measuring the particle size will be described later.

It is preferable that the particles constituting the magnetic iron oxide pigment of the present invention have the same size and shape as possible. It is not preferable that particles with greatly different particle shapes and sizes coexist, since the characteristics of the product will become unstable. As a guideline only, when observing the magnetic iron oxide pigment of the present invention with a scanning electron microscope, it is preferable that the proportion of particles whose shape is clearly different from that of surrounding particles is less than 5%. . Regarding the particle size, D 90 is the particle size when _the cumulative number from the small particle size side is 50%, 90%, and 95% of the total number of particles, respectively, as D ₅₀ , D ₉₀ , and D ₉₅ . The values of /D ₅₀ and D ₉₅ /D ₅₀ preferably do not exceed 3, and more preferably do not exceed 2.5.

The crystallite diameter of the magnetic iron oxide pigment of the present invention is not particularly limited, but is preferably 100 nm or less. When the crystallite diameter of the magnetic iron oxide pigment of the present invention is 100 nm or less, the intensity of reflected light and the color tone of the pigment fall within an appropriate range from the viewpoint of giving a three-dimensional impression to the user's face. Although the lower limit is not particularly limited, it is preferably 10 nm or more.

The magnetic iron oxide pigment of the present invention mainly consists of iron oxide, and the content of elements other than Fe and O that constitute iron oxide is not particularly limited. Since it is used as an additive to a cosmetic composition, it is better not to contain heavy metal elements. Furthermore, it is better not to contain phosphorus or silicon, since they cause changes in the properties of the pigment. Preferably, the silicon content is less than 3 g/kg and the phosphorus content is less than 1 g/kg. The silicon content is more preferably less than 1 g/kg. The content of these substances is measured by ICP, ICP-MS or fluorescent X-ray analysis.

It is preferable that the particles constituting the magnetic iron oxide pigment of the present invention have the same composition on the particle surface and inside the particle, except when the surface treatment described below is carried out. In particular, it is not preferable if a specific chemical species is unevenly distributed on the particle surface because there is a possibility that the chemical species will be eluted when added to a cosmetic composition.

The particles constituting the magnetic iron oxide pigment of the present invention are preferably dispersed in a dispersion medium when used in cosmetic compositions. In the dispersion medium, it is desirable that the particles do not aggregate or bind to each other, and if the dispersion is insufficient, it is desirable to change the dispersion medium or perform surface treatment as described below. Further, in general, it is not preferable from the viewpoint of dispersibility that the binding force with the resin component in the cosmetic composition is strong.

The magnetic iron oxide pigment to be incorporated into the cosmetic composition of the present invention is used for the purpose of improving dispersion stability and durability in a dispersion medium when producing a cosmetic composition. A coating layer of an inorganic substance such as an oxide, hydroxide, or oxyhydroxide of metals such as aluminum, silicon, zinc, titanium, zirconium, iron, cerium, and tin may be applied to at least a portion of the metal. Further, metal salts other than those mentioned above may be used as the inorganic coating. Furthermore, an organic coating layer may be applied to at least a portion of the particle surface in order to perform surface modification such as hydrophobic treatment. Examples of organic coatings include silicone compounds such as dimethylpolysiloxane and methylhydrogenpolysiloxane, coupling agents such as silane, aluminum, titanium, and zirconium, fluorine compounds such as perfluoroalkyl phosphoric acid compounds, and hydrocarbons. , lecithin, amino acids, polyethylene, wax, metal soaps, etc. A plurality of these processes may be performed in combination, and there is no particular restriction on the order of the processes.

The magnetic iron oxide pigment to be blended into the cosmetic composition of the present invention is preferably washed and purified after production within the common sense of those who manufacture materials to be blended into the cosmetic composition. If impurities remain in the pigment, it may affect its functionality as a cosmetic.

(Production method)
The method for producing the magnetic iron oxide pigment of the present invention will be explained in detail.
The magnetic iron oxide pigment of the present invention can be produced by reacting an aqueous ferrous salt solution with an alkali hydroxide to form a ferrous hydroxide slurry, and by blowing an oxygen-containing gas into the ferrous hydroxide slurry under heating. oxidizing ferrous hydroxide. At this time, the Fe concentration in the ferrous hydroxide slurry is 25 g/L or more and 35 g/L or less, and the hydroxide ion (OH ^- ) concentration that does not form ferrous hydroxide is 80 mmol/L or more. Alkali hydroxide is added in an amount such that the concentration is 240 mmol/L or less.

When the ferrous salt aqueous solution and the alkali hydroxide are reacted (neutralization reaction), it is preferable to carry out the reaction in an inert gas atmosphere. Moreover, when blowing oxygen-containing gas into ferrous hydroxide under heating, it is preferable to do so while controlling the pH and temperature.

Ferrous salt aqueous solutions include ferrous sulfate, ferrous chloride, ferrous nitrate, etc., but generally ferrous sulfate, which is a by-product of titanium oxide production by the sulfuric acid method, and iron materials and ferrous sulfate, which is generated when cleaning steel materials. As the alkali hydroxide, hydroxides of alkali metals and alkaline earth metals such as sodium hydroxide, potassium hydroxide, and calcium hydroxide, as well as ammonium hydroxide and ammonia gas can be used.

First, a ferrous salt aqueous solution and an alkali hydroxide are mixed to cause a neutralization reaction to produce ferrous hydroxide. A ferrous salt aqueous solution may be added to the alkali hydroxide, or vice versa. For fine adjustment of liquid volume and concentration, one or both liquids may be added in two or more parts. In order to obtain a pigment whose specific surface area and value K are within the desired range, it is necessary to set the Fe concentration in the tank to 25 g/L or more and 35 g/L or less. Further, the amount of hydroxide ion (OH ^- ) added needs to exceed 2.0 mol per 1.0 mol of iron ion (II). At the end of mixing, the added hydroxide ions (OH ^- ) form ferrous hydroxide with iron ions (II) in the slurry, but free hydroxide ions (OH - ) that do not form ferrous hydroxide form ferrous hydroxide. It is desirable to add hydroxide ions (OH ^- ) in an amount such that 80 mmol/L or more and 240 mmol/L or less of OH ^- ) remain in the slurry. The lower limit of the free hydroxide ion (OH ⁻ ) concentration is preferably 120 mmol/L or more, more preferably 150 mmol/L or more, and the upper limit of the concentration is preferably 200 mmol/L or less.

After the neutralization reaction is completed, neither iron (II) ions, iron (III) ions, nor alkali hydroxide are added to the tank. There is no need to add silicon or phosphorus when producing the iron oxide pigment of the present invention.

During the neutralization reaction, if the ferrous salt aqueous solution and the alkali hydroxide are mixed in the presence of oxygen in the solution, it will be difficult to control the oxidation state. It is preferable to create an inert atmosphere inside. Generally, the neutralization reaction is carried out while blowing nitrogen gas into the reaction tank. The liquid temperature during the neutralization reaction is not particularly limited, but is preferably 25°C or higher and 45°C or lower. If the temperature is 25°C or higher, the reaction rate is sufficiently high, and if the temperature is 45°C or lower, substances other than ferrous hydroxide are difficult to produce. The lower limit is more preferably 35°C or higher.

Oxygen-containing gas is blown into the slurry containing ferrous hydroxide after the neutralization reaction under heating to oxidize the ferrous hydroxide and obtain iron oxide. At this time, it is preferable to maintain the slurry at a temperature of 80°C or higher and 96°C or lower. As the oxygen-containing gas, for example, air or a mixed gas of air and nitrogen can be used. It is preferable to oxidize the ferrous hydroxide until the oxidation rate measured by the method described below becomes 67 mol% or more and 71 mol% or less. Maintaining the slurry at the above temperature during oxidation provides good industrial efficiency and facilitates control of the oxidation rate. More preferably, the lower limit of the holding temperature is 85°C or higher, and the upper limit is 92°C or lower. The oxidation is carried out without interruption until the target oxidation rate is reached, and no new substances are added to the slurry during the process. Although the oxidation rate is not particularly limited, if the oxidation rate is too high, it becomes difficult to stop the oxidation at the desired oxidation rate. As a guideline, it is preferably 14 mol%/h or more and 48 mol%/h or less. Oxidation rate can be measured by the following method:
Concentrated sulfuric acid is added to the slurry and heated to dissolve particles of iron oxide in the slurry. Iron (II) ions in the solution are titrated using an aqueous potassium permanganate solution, and the titration amount at this time is referred to as "titration amount A." Next, all the iron (III) ions in the solution were reduced to iron (II) ions using mercury amalgam, and then the iron (II) ions in the solution were titrated again using an aqueous potassium permanganate solution. , the titration amount at this time is referred to as "titration amount B". Calculate the oxidation rate using the following formula:
Oxidation rate (mol%) = 100 x (titration amount B - titration amount A)/titration amount B.

Once the oxidation is complete, it is preferable to neutralize the slurry by adding acid in an inert atmosphere until the pH of the slurry is 6.5. At this time, it is desirable to gradually add the acid while stirring the inside of the tank well so as not to cause a large difference in the hydrogen ion concentration in the slurry. The type of acid is not particularly limited, but it is preferable to use an acid that has no oxidizing power and does not easily remain on the surface of the pigment, such as dilute sulfuric acid. Once neutralization is complete, the slurry is allowed to cool to room temperature while stirring under an inert atmosphere.

A magnetic iron oxide pigment can be obtained by filtering the slurry by a known method and washing with water to remove surface acids and alkalis. Magnetic iron oxide pigments after filtration and washing can be dried using a known method to remove moisture, but if dried at temperatures above 100°C, oxidation may proceed due to residual moisture and heat. It is therefore undesirable. The dried magnetic iron oxide pigment can be pulverized by a known method.

The particle surface of the obtained magnetic iron oxide pigment may be coated with a layer containing an inorganic substance and/or an organic substance, if necessary. When a coating is applied, one or more layers containing an inorganic substance or an organic substance may be applied. When coating two or more layers, two or more layers containing the same or different types of inorganic substances or layers containing organic substances may be coated, or a layer containing organic substances may be coated on a layer containing inorganic substances. Alternatively, a layer containing an inorganic substance may be coated on a layer containing an organic substance.

When coating with a layer containing an inorganic substance, the magnetic iron oxide pigment is once dispersed in water, and a predetermined amount of inorganic metal salt is added to turn the inorganic metal salt into an insoluble hydrated oxide. can be coated with an inorganic compound. During these treatments, components in the magnetic iron oxide pigment do not dissolve into the coating layer. Inorganic metal salts that can be used in the present invention are not particularly limited as long as they can form hydroxides or oxides of metals such as aluminum, silicon, zinc, titanium, zirconium, cerium, and tin, but are preferred. Sodium aluminate, aluminum sulfate, aluminum nitrate, aluminum chloride, sodium silicate, potassium silicate, silicon tetrachloride, zinc sulfate, zinc chloride, titanium sulfate, titanium tetrachloride, zirconium oxychloride, zirconium sulfate, zirconium nitrate, chloride Examples include cerium, cerium nitrate, cerium acetate, tin chloride, stannous sulfate, and sodium stannate.

For water and/or oil repellency, the magnetic iron oxide pigment of the present invention may be coated with a layer containing an organic substance. In this case, organic substances include silicone compounds such as dimethylpolysiloxane and methylhydrogenpolysiloxane, coupling agents such as silane, aluminum, titanium and zirconium, fluorine compounds such as perfluoroalkyl phosphoric acid compounds, Examples include hydrocarbons, lecithin, amino acids, polyethylene, waxes, and fatty acids such as lauric acid, stearic acid, and isostearic acid.

(Cosmetic composition)
The magnetic iron oxide pigment of the present invention is used by being incorporated into a cosmetic composition. A cosmetic composition containing the magnetic iron oxide pigment of the present invention is one embodiment of the present invention.

The cosmetic composition containing the magnetic iron oxide pigment of the present invention can give a three-dimensional impression to the user's face, and can be easily removed when no longer needed. Furthermore, the cosmetic composition containing the magnetic iron oxide pigment of the present invention is less likely to aggregate. Taking advantage of these characteristics, the magnetic iron oxide pigment of the present invention is particularly suitable for use as a skin cosmetic.

Furthermore, the cosmetic composition containing magnetic iron oxide of the present invention can be used as a cosmetic other than skin cosmetics. For example, it can be used around the eyes or on the lips, such as as eyeliner or lipstick. In addition, the magnetic iron oxide pigment of the present invention can be easily removed after use, making it suitable for use in cosmetic compositions for areas other than the face, as well as for use in cosmetic compositions that are conventionally used in cosmetic compositions. It can also be used to replace iron oxide pigments.

The form of the cosmetic composition is not particularly limited, and may be a liquid cosmetic, a solid cosmetic, or a gel cosmetic. Liquid cosmetics may be in any form such as an aqueous dispersion, an oily dispersion, or a lotion, such as makeup bases, control colors, sunscreen cosmetics, eye shadows, eye liners, and mascara. , makeup cosmetics such as cheek color and nail polish, skin care cosmetics, hair care cosmetics, permanent hair dyes, semi-permanent hair dyes, primary hair dyes, nail cosmetics, and the like. Solid cosmetics may be in any form such as powder, solid powder, paste, oily solid, etc. For example, make-up base, foundation, loose powder, blusher, concealer, eyebrow powder, etc. , face powder, control color, mascara, cheek color, body powder, pressed powder, perfume powder, baby powder, and other makeup cosmetics, skin care cosmetics, hair care cosmetics, and the like. A gel cosmetic is one of the embodiments of the cosmetic composition of the present invention. The dosage form may be cream, milky lotion, oily liquid, paste, etc., such as makeup base, control color, sunscreen cosmetics, lipstick, eyeshadow, eyeliner, mascara, lipstick, etc. It can be used as makeup cosmetics such as cream, lip color, lip gloss, and nail polish, skin care cosmetics, hair care cosmetics, and the like.

Cosmetics that do not necessarily require coloring are also an embodiment of the cosmetic composition of the present invention, such as shampoos, conditioners, body shampoos, facial cleansing foams, facial cleansing powders, soaps, powdered bath salts, peel-off packs, toothpastes, etc. It can also be used.

The method for producing the cosmetic composition is not particularly limited. It can be produced by combining the magnetic iron oxide pigment of the present invention with other materials necessary for a cosmetic composition. For example, it can be manufactured by mixing a magnetic iron oxide pigment and other components to form a desired dosage form such as liquid, solid, or gel. For example, when preparing a solid cosmetic composition, drying, molding, etc. can be performed as necessary after mixing each component. The equipment used for mixing, drying, molding, etc. is not particularly limited.

The cosmetic composition of the present invention preferably contains 0.1 g/kg or more and 500 g/kg or less of the magnetic iron oxide pigment of the present invention having the above characteristics. When the amount of the magnetic iron oxide pigment is 500 g/kg or less, the cosmetic composition is prevented from having a powdery feel and is easily spread over a wide range. The upper limit is more preferably 400 g/kg or less, still more preferably 300 g/kg or less, even more preferably 250 g/kg or less.

The cosmetic composition of the present invention may use only the magnetic iron oxide pigment of the present invention as a coloring agent, or may contain other pigments within a quantitative and qualitative range that does not impair the effects of the present invention. You can also adjust the color tone. Inorganic pigments that can usually be used in combination include titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, brown iron oxide, ultramarine, deep blue, red iron oxide, cerium oxide, talc, muscovite, synthetic mica, phlogopite, Biotite, synthetic fluorophlogopite, titanium mica, micaceous iron oxide, sericite, zeolite, kaolin, bentonite, clay, silicic acid, silicic anhydride, magnesium silicate, magnesium aluminum silicate, calcium silicate, barium sulfate, Magnesium sulfate, calcium sulfate, calcium carbonate, magnesium carbonate, boron nitride, bismuth oxychloride, alumina, zirconium oxide, magnesium oxide, chromium oxide, calamine, hydroxyapatite, complexes thereof, and the like can be used. Organic pigments that can also be used in combination include silicone powder, silicone elastic powder, polyurethane powder, cellulose powder, nylon powder, urethane powder, silk powder, PMMA powder, starch, polyethylene powder, polystyrene powder, carbon black, tar pigment, natural pigment, Metal soaps such as zinc stearate and complexes thereof can be used. When adding pigments other than the magnetic iron oxide pigment of the present invention to the cosmetic composition of the present invention, the pigments to be added include red iron oxide, yellow iron oxide, and /or brown iron oxide is preferred. It may also be used in combination with other black iron oxides.

The cosmetic composition containing the magnetic iron oxide pigment of the present invention may contain other components other than the pigment, depending on the purpose, within a quantitative and qualitative range that does not impair the effects of the present invention. For example, oily components, pigments, pH adjusters, humectants, thickeners, surfactants, dispersants, stabilizers, colorants, preservatives, antioxidants, sequestrants, astringents, anti-inflammatory agents, ultraviolet rays. One or more of absorbents, fragrances, abrasives, etc. may be appropriately blended. In particular, it is desirable to incorporate a platy compound such as mica, since this improves the slipperiness of the cosmetic composition.

Prior to describing Examples, the evaluation method used in the present invention will be described.
[Evaluation items and evaluation method]
[BET specific surface area]
It was measured by the BET single point method using Gemini VII2390 manufactured by Micromeritics Instrument Corporation.

[value K]
Coercive force: Hc (kA/m) in an external magnetic field of 397.9 kA/m was measured using a vibrating sample magnetometer VSM-3 manufactured by Toei Kogyo Co., Ltd. The details of the operation are shown below. In addition, in this measurement, "-" in the external magnetic field value indicates that the direction of the magnetic field is opposite to "+". Further, the operation was carried out in a room where the room temperature was kept at 23°C.

First, using a standard sample, the magnetization of the vibrating sample magnetometer when +397.9 kA/m (5 kOe) was applied was adjusted to 5 EMU. A cylindrical cell with a bottom area of 38.47 mm ² , a height of 7 mm, and an internal capacity of 0.05655 cm ³ was filled with sample powder so that the packing density was in the range of 2.20 g/cm ³ to 2.40 g/cm ³ . was filled. The cylindrical cell was set in the apparatus so that the height direction was vertical, and the external magnetic field was set to +397.9 kA/m, and the external magnetic field was applied to the sample from 0 A/m. The applied acceleration was lowered from around 79.6 kA/m, and above +79.6 kA/m, the applied acceleration was set to the lowest value of 20 min/Full-scale, and the applied acceleration was applied so as not to exceed +397.9 kA/m. After maintaining the applied state of +397.9 kA/m for about 1 s, the magnetic field was reversed and a charge was applied in the opposite direction to -397.9 kA/m. Similarly to when applying up to +397.9 kA/m, lower the applied acceleration for negative charges of -79.6 kA/m or more, and set the applied acceleration to the lowest 20 min/Fullscale for negative charges of -79.6 kA/m or more. , -397.9 kA/m was not applied. After reversing the magnetic field, confirm that the magnetization of the sample decreases, and while adjusting the applied acceleration, track the change in magnetization of the sample, and calculate the absolute value of the external magnetic field when the magnetization of the sample becomes zero by -Hc. ₁ (kA/m). After holding the external magnetic field at -397.9 kA/m for about 1 s, reverse the magnetic field and apply it from 0 kA/m to +397.9 kA/m again to +397.9 kA/m. It was applied up to After reversing the magnetic field, confirm that the absolute value of the sample's magnetization decreases, and track the sample's magnetization while adjusting the applied acceleration in the same way as before, and calculate the value of the external magnetic field when the sample's magnetization becomes zero. was defined as Hc ₂ (kA/m).
The average value of Hc ₁ and Hc ₂ read by the above operation was defined as the coercive force Hc (kA/m), and the value obtained by dividing the coercive force Hc by the BET specific surface area was defined as the value K.

[Average particle diameter]
Measurement was performed using a transmission electron microscope JEM-1400plus manufactured by JEOL Ltd. The observation magnification was 45,000 times (15,000 times the observation magnification of the transmission electron microscope x 3 times the print). A circle with an equal area was created according to the particle, and its diameter was taken as the particle diameter. The above operation was performed on approximately 300 particles within the observation field, and the average length of the particle diameter was defined as the average particle diameter in the present invention.

[Oil absorption amount]
2.0 g of a sample of magnetic iron oxide pigment was spread on a plate glass, boiled linseed oil was dropped little by little into the center of the sample, and each time the whole sample was mixed with a spatula to knead the sample and boiled linseed oil. The end point was when the entire sample became a uniform putty-like mass. If the boiled linseed oil used is e (mL), the oil absorption amount (g/100g) is 46.75×e.

[Bulk density]
Evaluation was made in accordance with JISK5101-12-1. Place a funnel and a sieve with an opening of 45 μm on the funnel stand of an apparent density measuring device that meets the standards, place a tablespoon of magnetic iron oxide pigment sample with a volume of 15 mL on the sieve, and sieve it with a hard-bristle brush. The entire surface was evenly and lightly swept to disperse the sample, which was then received in a receiver under the funnel stand. This operation was repeated until the sample was piled up in the receiver. Next, after scraping off the mountain part with a spatula, the mass of the contents in the receiver was measured. If the mass of the contents is a (g), the bulk density d (g/mL) is calculated by the following formula:
d=a/30.

[3D impression]
0.25 g of the magnetic iron oxide pigments of Examples and Comparative Examples were mixed with 0.15 g of titanium oxide C-50R manufactured by Ishihara Sangyo Co., Ltd. to prepare mixed pigments. Five panelists applied the mixed pigment to the face, mainly around the cheekbones, and evaluated the visual impression.
(Evaluation criteria)
・The user's face appeared three-dimensional: 4 points ・The user's face appeared three-dimensional when I consciously looked at it: 3 points ・The impression of the user's face was the same as before application. : 2 points - The user's face gave a rather flat impression. :1 point (judgment criteria)
The average score was calculated for each sample and rounded up to one decimal place.

[Easy to drop]
After placing 0.15 g of the mixed pigment on the palm of the hand and rubbing it strongly with the fingers, the remaining mixed pigment was wiped with Kimwipe (registered trademark). Thereafter, hands were wetted and washed using commercially available household liquid soap (hereinafter referred to as "liquid soap"). If the black color remained, the hands were wetted again and washed again using commercially available bar soap (hereinafter referred to as "bar soap"). In general, solid soap has a larger proportion of soap ingredients than liquid soap, so it has greater cleaning power than liquid soap.
(Evaluation criteria)
・When I washed my hands with liquid soap, the black part completely disappeared from the palm of my hand: 4 points ・Even after washing with liquid soap, the black part remained, but after washing with solid soap once, the black color completely disappeared from the palm of the hand. No more: 3 points - When I washed my hands with bar soap many times (at least 2 times), I was able to remove most of the black parts from my palms (visually over 95% compared to before washing): 2 points - Even after washing with bar soap many times (twice or more), black areas clearly remained on the palms (visually 5% or more compared to before washing): 1 point (judgment criteria)
The average score was calculated for each sample and rounded to the second decimal place.

The present invention will be explained in more detail with reference to Examples below. The examples given below are given for illustrative purposes only and the scope of the invention is not limited thereby.
In addition, in the stirring operations described in the Examples and Comparative Examples, properties related to the behavior of the liquid during stirring, such as liquid volume, liquid viscosity, and container shape, are taken into consideration to ensure that the entire liquid is mixed uniformly and The rotation speed is adjusted appropriately to prevent droplets from scattering around. In addition, in cases where the same effect can be obtained from any company's product, such as sodium hydroxide, if it is a general commercially available product, the name of the manufacturer and sales company is omitted.

[Example 1]
150 L of an aqueous solution containing 17 kg of sodium hydroxide was placed in the reaction tank. A ferrous sulfate aqueous solution containing 12 kg of Fe was added to the reaction tank while the liquid temperature was set to 40° C. and 80 L of nitrogen was supplied per minute, and the mixture was stirred for about 10 minutes. The Fe concentration in the reaction tank was measured, and water was added to adjust the Fe concentration to 30.0 g/L. Further, an aqueous sodium hydroxide solution was added to adjust the hydroxide ion (OH ⁻ ) concentration in the slurry to 160 mmol/L. The temperature of the reaction tank was raised to 88° C., nitrogen supply was stopped, and air was supplied at 60 L/min to start the oxidation reaction. When the oxidation rate becomes 67% or more and 71% or less, stop supplying air, and while supplying 80 L of nitrogen per minute, adjust the slurry pH to 6.5 with dilute sulfuric acid, and while stirring under a nitrogen atmosphere. It was allowed to cool to room temperature. The slurry was filtered and washed with tap water until the electrical conductivity of the filtrate was 200 μS/cm or less. The washed cake was dried at 90°C for 3 hours. The dried product was pulverized using a TASM-1 sample mill manufactured by Tokyo Atomizer Manufacturing Co., Ltd. (hereinafter abbreviated as "atomizer") to obtain a magnetic iron oxide pigment. The obtained magnetic iron oxide pigment is a black rough grain with an average particle diameter of 0.65 μm, a BET specific surface area of 2.1 m ² /g, a value K of 3.15 kAg/m ³ , and an oil absorption of 30 g/100 g. , the bulk density was 0.31 g/mL, the D ₉₀ /D ₅₀ was 1.4, and the D ₉₅ /D ₅₀ was 1.5. In addition, in a sensory test using a mixed pigment in which the obtained magnetic iron oxide pigment was mixed with titanium oxide, the average value for three-dimensional impression was 3.8 points, and the average value for ease of removal was 3.9 points. Ta.

[Example 2]
A magnetic iron oxide pigment was obtained in the same manner as in Example 1, except that the hydroxide ion (OH ⁻ ) concentration in the slurry was adjusted to 90 mmol/L. The obtained magnetic iron oxide pigment was a black rough grain with an average particle diameter of 0.51 μm, a BET specific surface area of 2.7 m ² /g, a value K of 2.35 kAg/m ³ , and an oil absorption of 29 g/100 g. , the bulk density was 0.26 g/mL, the D ₉₀ /D ₅₀ was 1.3, and the D ₉₅ /D ₅₀ was 1.4. In addition, in a sensory test using a mixed pigment in which the obtained magnetic iron oxide pigment was mixed with titanium oxide, the average value for three-dimensional impression was 3.5 points, and the average value for ease of removal was 3.5 points. Ta.

[Example 3]
A magnetic iron oxide pigment was obtained in the same manner as in Example 1, except that the hydroxide ion (OH ⁻ ) concentration in the slurry was adjusted to 180 mmol/L. The obtained magnetic iron oxide pigment was a black rough grain with an average particle diameter of 0.72 μm, a BET specific surface area of 1.9 m ² /g, a value K of 3.41 kAg/m ³ , and an oil absorption of 31 g/100 g. , the bulk density was 0.33 g/mL, the D ₉₀ /D ₅₀ was 1.7, and the D ₉₅ /D ₅₀ was 1.8. In addition, in a sensory test using a mixed pigment in which the obtained magnetic iron oxide pigment was mixed with titanium oxide, the average value for three-dimensional impression was 3.8 points, and the average value for ease of removal was 3.9 points. Ta.

[Comparative example 1]
BL-100HP manufactured by Titan Kogyo Co., Ltd. was used.
[Comparative example 2]
ABL-412HP manufactured by Titan Kogyo Co., Ltd. was used.

[Comparative example 3]
BL-50HP manufactured by Titan Industries Co., Ltd. was used.
Table 1 shows the evaluation results of the magnetic iron oxide pigments described in Examples and Comparative Examples. The magnetic iron oxide pigment described in the Examples gave a three-dimensional impression to the user's face and could be easily removed. From this, it is considered that the magnetic iron oxide pigment of the present invention can be suitably used in cosmetic compositions that give a three-dimensional impression to the user's face.

Examples of formulations of cosmetic compositions using the magnetic iron oxide pigment of the present invention are shown below. The red iron oxide pigment is R-516HP manufactured by Titan Industries Co., Ltd., the brown iron oxide pigment A is BBR-213HP manufactured by Titan Industries Co., Ltd., the brown iron oxide pigment B is BBR-309HP manufactured by Titan Industries Co., Ltd., and the yellow iron oxide is BBR-309HP manufactured by Titan Industries Co., Ltd. LL-100HP manufactured by Titan Kogyo Co., Ltd. was used. As for titanium oxide, unless otherwise specified, C-50R manufactured by Ishihara Sangyo Co., Ltd. was used.

Skin cosmetics are one of the main uses of the present invention. Prescription examples are shown below.
[Prescription example]
Formulation 1: Powder foundation Ingredients Mixing ratio (g/kg)
(1) Brown iron oxide pigment A 8.9
(2) Pigment described in Example 1 1.1
(3) Mica (PDM-1000 manufactured by Topy Industries, Ltd.) 490
(4) Talc (JA-46R manufactured by Asada Seifun Co., Ltd.) 300
(5) Titanium oxide 100
(6) Oil agent {Clodarane SWL (manufactured by Croda Co., Ltd.), Phytosqualane (manufactured by Iwase Cosfa Co., Ltd.), O. D. O (manufactured by Nisshin Oilio Group Co., Ltd.), T. I. A mixture of O (manufactured by Nisshin Oilio Group Co., Ltd.) and KF-56 (manufactured by Shin-Etsu Chemical Co., Ltd.) in a ratio of 4:4:3:3:6} 100
(Manufacturing method)
(1) and (2) were mixed manually in advance, and the mixed pigment and (3) to (6) were uniformly mixed using FM-10B manufactured by Mitsui Miike Kakoki Co., Ltd. (hereinafter referred to as "Henschel mixer"). . The mixture was pulverized with an atomizer, filled into a mold, and compression molded to obtain the desired powder foundation. The obtained powder foundation gave a three-dimensional impression to the user's face and could be easily removed after use.

Formulation 2: Stick-shaped foundation Ingredients Mixing ratio (g/kg)
(1) Cyclopentasiloxane 300
(2) Ethylhexyl methoxycinnamate 50
(3) Diisostearyl malate 40
(4) Candelilla wax 60
(5) Hydrogenated jojoba ester 40
(6) Cetyl dimethicone copolyol 20
(7) Sorbitan sesquiisostearate 5
(8) Silicone-treated brown iron oxide pigment A (Note 1) 25
(9) Pigment described in silicone treatment Example 1 (Note 1) 2
(10) Silicone-treated titanium oxide (Note 1) 70
(11) Silicone treated talc (Note 1) 60
(12) Methyl methacrylate crosspolymer (M-305 manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.)
40
(13) Purified water Remaining (14) Sodium citrate 3
(15) Propanediol 30
(16) Glycerin 20
(Note 1) Surface treated with KF-9909 manufactured by Shin-Etsu Chemical Co., Ltd. (manufacturing method)
Powder parts (8) to (12) were mixed in advance using a Henschel mixer. Oil phase parts (1) to (7) were weighed into a container that could hold the entire amount, and heated and dissolved. The aqueous phases (13) to (16) were weighed into a separate container and dissolved by heating. The powder part was added to the oil phase and uniformly dispersed, the aqueous phase was added and emulsified, and after defoaming, the bulk was poured into a mold and slowly cooled to room temperature to obtain the desired stick-shaped foundation. The obtained stick-shaped foundation gave a three-dimensional impression to the user's face and could be easily removed after use.

Formulation 3: Pressed powder Ingredients Mixing ratio (g/kg)
(1) Silicone-treated talc (Note 1) Residue (2) Methyl methacrylate crosspolymer (M-305 manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.)
100
(3) Silicone-treated sericite (Note 1) 500
(4) Silica (Sunsphere (registered trademark) NP-30 manufactured by AGC SI Tech Co., Ltd.) 60
(5) Silicone-treated titanium oxide (Note 1) 55
(6) Pigment described in silicone treatment Example 1 (Note 1) 0.5
(7) Silicone-treated red iron oxide (Note 1) 0.5
(8) Silicone-treated brown iron oxide A (Note 1) 10
(9) Ethylhexyl methoxycinnamate 30
(10) Squalane 20
(11) Preservative: Appropriate amount (12) Antioxidant: Appropriate amount (Note 1) Surface treated with KF-9909 manufactured by Shin-Etsu Chemical Co., Ltd. (Production method)
Powder parts (1) to (8) were mixed and pulverized, and this was transferred to a Henschel mixer, and oil phase parts (9) to (12) were added thereto and mixed by stirring until uniform. After that, it was pulverized with an atomizer. This was press-molded into an aluminum plate to obtain the desired pressed powder. The obtained pressed powder gave a three-dimensional impression to the user's face and could be easily removed after use.

Prescription 4: Cheeks Ingredients Mixing ratio (g/kg)
(1) Triethoxycaprylylsilane-treated talc (Note 1) 250
(2) Triethoxycaprylylsilane-treated sericite (Note 1) Remaining (3) Triethoxycaprylylsilane-treated titanium oxide (Note 1) 18
(4) Stearic acid-treated titanium oxide (STV-455 manufactured by Titan Kogyo Co., Ltd.) 30
(5) Triethoxycaprylylsilane-treated black iron oxide pigment (Note 1) 0.5
(6) Triethoxycaprylylsilane-treated red iron oxide pigment (Note 1) 2
(7) Triethoxycaprylylsilane-treated brown iron oxide pigment B 8
(8) Ethylhexyl methoxycinnamate 30
(9) Ethylhexyl palmitate 50
(10) Preservative: Appropriate amount (11) Antioxidant: Appropriate amount (Note 1) Surface treated with AES-3083 manufactured by Shin-Etsu Chemical Co., Ltd. (Production method)
(1) to (7) were mixed in a Henschel mixer, and heated and dissolved (8) to (11) were mixed therein, followed by pulverization in an atomizer. This was press-molded into an aluminum plate to obtain the desired blush. The resulting blusher gave a three-dimensional impression to the user's face and could be easily removed after use.

Formulation 5: O/W emulsified foundation Ingredients Mixing ratio (g/kg)
(1) Stearic acid 10
(2) Isostearic acid 3
(3) Cetyl ethylhexanoate 40
(4) Liquid paraffin 70cs 110
(5) Steerless-10 20
(6) Cetyl alcohol 15
(7) Triethoxycaprylylsilane-treated talc (Note 1) 50
(8) Triethoxycaprylylsilane-treated brown iron oxide pigment A (Note 1) 30
(9) Triethoxycaprylylsilane-treated yellow iron oxide pigment (Note 1) 5
(10) Triethoxycaprylylsilane treatment Pigment described in Example 1 (Note 1) 2
(11) Triethoxycaprylylsilane-treated titanium oxide (Note 1) 75
(12) Triethanolamine 12
(13) Propanediol 50
(14) Xanthan gum 2
(15) Purified water Remaining (16) Phenoxyethanol 5
(Note 1) Surface treated with AES-3083 manufactured by Shin-Etsu Chemical Co., Ltd. (manufacturing method)
Mixed and pulverized (7) to (11) were added to (1) to (6) that had been heated and dissolved at 85°C, and uniformly dispersed. The mixture of (12) to (16) heated to 85°C was gradually added to emulsify the mixture, and after stirring and cooling to room temperature, the mixture was filled into a suitable container to obtain the desired O/W emulsified foundation. . The obtained O/W emulsion type foundation gave a three-dimensional impression to the user's face and could be easily removed after use.

Formula 6: 2WAY cake foundation Ingredients Mixing ratio (g/kg)
(1) Silicone-treated talc (Note 1) Remainder (2) Silicone-treated titanium oxide (Note 1) 100
(3) Silicone treated mica (Note 1) 200
(4) Silicone-treated sericite (Note 1) 360
(5) Nylon powder 100
(6) Silicone-treated red iron oxide pigment (Note 1) 2
(7) Silicone-treated brown iron oxide pigment B (Note 1) 30
(8) Silicone-treated yellow iron oxide pigment (Note 1) 5
(9) Pigment described in silicone treatment Example 1 (Note 1) 2
(10) Dimethicone 1000cs 60
(11) Isotridecyl isononanoate 30
(12) Squalane 30
(13) Tocopherol 1
(14) 1,3-butylene glycol 10
(Note 1) Surface treated with KF-9909 manufactured by Shin-Etsu Chemical Co., Ltd. (manufacturing method)
Mix (1) to (9) with a Henschel mixer, mix heated and dissolved (10) to (14), then crush with an atomizer, press mold into an aluminum plate, and create the desired 2-way cake foundation. Obtained. The obtained 2WAY cake foundation gave a three-dimensional impression to the user's face and could be easily removed after use.

Cosmetic compositions for use around the eyes and lips are also one aspect of the use of the present invention. Prescription examples are shown below.
Formulation 7: Lipstick Ingredients Mixing ratio (g/kg)
(1) Ceresin 100
(2) Microcrystalline wax 32
(3) Paraffin 50
(4) Pentaerythrityl tetraisostearate 200
(5) Diisostearyl malate 150
(6) Hydrogenated polydecene 100
(7) Vaseline 100
(8) Polyglyceryl triisostearate-2 Remainder (9) Simethicone 1
(10) Propylparaben 1
(11) Red No. 202 3
(12) Brown iron oxide pigment A 20
(13) Pigment described in Example 1 2
(14) Titanium oxide 3
(15) Silica 10
(manufacturing method)
(1) to (15) were weighed and mixed under heating. After uniformly dispersing with a three-roll mill BR-100VIII (hereinafter referred to as "three-roll mill") manufactured by Imex Corporation, the mixture was further heated and stirred uniformly. After defoaming, the heated mixture was poured into a mold and rapidly cooled. The desired lipstick was obtained by attaching it to a suitable container. The resulting lipstick gave a three-dimensional impression to the user's lips and could be easily removed after use.

Formulation 8: Press type eyeshadow Ingredients Mixing ratio (g/kg)
(1) Brown iron oxide pigment A 270
(2) Pigment described in Example 1 3
(3) Sericite residue (4) Talc 149
(5) Mica titanium (Flamenco (registered trademark) Super manufactured by BASF)
Pearl 120C) 200
(6) Methylparaben 1
(7) Dimethicone 1000cs 70
(8) Diisostearyl malate 30
(9) Isopropyl alcohol appropriate amount (manufacturing method)
(1) to (6) were mixed and ground. Then, the mixed ingredients (7) and (8) were added to another container and mixed by stirring to become uniform. The prepared mixture was dispersed in (9) to a suitable viscosity, and the slurry was filled into a suitable metal plate. It was dried at 40° C. for 12 hours to obtain the desired press type eye shadow. The obtained product gave a three-dimensional impression around the eyes of the user and was easily removed after use.

Formulation 9: Water-based eyeliner Ingredients Mixing ratio (g/kg)
(1) Pigment described in Example 1 60
(2) Brown iron oxide pigment B 25
(3) Purified water Remaining (4) Decaglyceryl laurate 10
(5) Glycerin 60
(6) Carboxymethylcellulose 100g/kg aqueous solution 180
(7) Phenoxyethanol 5
(8) Pentylene glycol 10
(9) Vinyl acetate resin emulsion (Vinibran (registered trademark) manufactured by Nissin Chemical Industry Co., Ltd.)
GV-5651) 450
(Manufacturing method)
(1) to (3) were weighed, and (1) and (2) were finely dispersed in (3) using an Easy Nano RMB type bead mill manufactured by Imex Corporation. (4) to (8) were weighed in a separate container, a pigment portion was added at 70° C. to uniformly disperse the mixture, and then cooled to room temperature and (9) was added to obtain the desired aqueous eyeliner. The resulting water-based eyeliner gave a three-dimensional impression around the user's eyes, and could be easily removed after use.

Formulation 10: Oil-based eyeliner Ingredients Mixing ratio (g/kg)
(1) Dextrin isostearate (Unifirma (registered trademark) manufactured by Chiba Flour Milling Co., Ltd.)
HVY) 50
(2) Microcrystalline wax 50
(3) Palmitic acid dextrin 100
(4) Diisostearyl malate 100
(5) Isododecane remainder (6) Pigment described in silicone treatment example 1 255
(7) Silicone-treated brown iron oxide pigment B 25
(8) Mica 200
(Manufacturing method)
(1) to (5) were weighed and heated and mixed until uniform. Further, mixed and pulverized (6) to (8) were added, heated and mixed until uniform, cooled to 40°C, and then filled into a suitable container and cooled to room temperature to obtain the desired oil-based eyeliner. The obtained oil-based eyeliner gave a three-dimensional impression around the user's eyes, and could be easily removed after use.
A cosmetic composition in which the conventionally used black pigment is replaced with the magnetic iron oxide pigment of the present invention by taking advantage of its easy-to-remove characteristics is also one embodiment of the use of the present invention.

Formulation 11: Pressed Eyebrow Ingredients Mixing ratio (g/kg)
(1) Titanium oxide 135
(2) Pigment described in Example 1 150
(3) Brown iron oxide pigment B 25
(4) Gunjo 5
(5) Mica remainder (6) Talc 100
(7) Lanolin wax 100
(8) Liquid paraffin 40
(9) Glyceryl stearate 10
(10) Appropriate amount of preservative (11) Appropriate amount of antioxidant (manufacturing method)
Mixed and pulverized (1) to (6) were added to heated and melted (7) to (11), mixed until uniform, and compression molded to obtain the desired pressed eyebrow. The obtained pressed eyebrow had a unique pale color and could be easily removed after use.

Formulation 12: Eyebrow pencil Ingredients Mixing ratio (g/kg)
(1) Pigment described in Example 1 150
(2) Brown iron oxide pigment B 20
(3) Red iron oxide pigment 10
(4) Titanium oxide 45
(5) Talc remainder (6) Kaolin 150
(7) Mokuro 200
(8) Stearic acid 100
(9) Beeswax 50
(10) Hydrogenated castor oil 50
(11) Vaseline 30
(12) Lanolin 30
(13) Squalane 30
(14) Appropriate amount of preservative (15) Appropriate amount of antioxidant (manufacturing method)
Mixed and pulverized (1) to (6) are added to heated and melted (7) to (15), kneaded uniformly in a three-roll mill, shaped into a pencil core, sandwiched between pieces of wood, and shaped into a pencil to form the desired eyebrow pencil. I got it. The obtained eyebrow pencil had a unique light color and could be easily removed after use.

Formulation 13: Emulsifying mascara Ingredients Mixing ratio (g/kg)
(1) Purified water remainder (2) Polyvinylpyrrolidone 20
(3) Propanediol 20
(4) Cationized cellulose 1% aqueous solution 100
(5) Bentonite 5
(6) Triethanolamine 17
(7) Methylparaben 2
(8) Talc 40
(9) Pigment described in Example 1 90
(10) Brown iron oxide pigment B 30
(11) Carnauba wax 55
(12) Beeswax 90
(13) Stearic acid 20
(14) Self-emulsifying glyceryl stearate 20
(15) Propylene glycol stearate 20
(16) Hydrogenated polyisobutene 20
(17) Cyclopentasiloxane 40
(18) Acrylic acid resin emulsion (Daitosol (registered trademark) 5000AD manufactured by Daito Kasei Kogyo Co., Ltd.) 200
(Manufacturing method)
(1) to (7) were added to (8) to (10), which had been stirred and mixed in advance using a Henschel mixer, and uniformly dispersed using a stirrer. After heating and dissolving (11) to (17) were added thereto and emulsified, the mixture was cooled to 40°C, and (18) was added thereto, and the mixture was cooled to room temperature to obtain the desired emulsified mascara. The resulting emulsified mascara had a unique light color and could be easily removed after use.

Formulation 14: Oil-based mascara Ingredients Mixing ratio (g/kg)
(1) Hydrogenated polyisobutene 20
(2) Isododecane remainder (3) Dextrin isostearate 50
(4) Palmitic acid dextrin 150
(5) Microcrystalline wax 20
(6) Polyethylene wax 30
(7) Propylparaben 1
(8) Talc 60
(9) Pigment described in Example 1 55
(10) Brown iron oxide pigment B 10
(11) Dimethylsilylated silica 5
(12) Nylon fiber (5D-8MM manufactured by Cosmetials Co., Ltd.) 10
(Manufacturing method)
(1) to (7), which had been heated and dissolved, were mixed with (8) to (10), which had been mixed and ground in advance, and (11). After cooling, (12) was uniformly dispersed to obtain an oil-based mascara. The obtained oil-based mascara had a unique light color and could be easily removed after use.
Use for face washing, removing dirt from the body, and tooth brushing is also an embodiment of the use of the cosmetic composition of the present invention.

Formulation 15: Body shampoo Ingredients Mixing ratio (g/kg)
(1) Lauric acid 115
(2) Myristic acid 77
(3) Palmitic acid 48
(4) Potassium hydroxide (purity 480g/kg) 122
(5) Laurylhydroxysulfobetaine 100
(6) Cocamide monoethanolamide 10
(7) Ethylene glycol distearate 20
(8) Purified water Remaining (9) EDTA-4Na 1
(10) Pigment described in Example 1 10
(11) Yellow iron oxide pigment 5
(12) Talc 4
(Manufacturing method)
(1) to (3) were heated from 70°C to 80°C to dissolve them. Next, (4) was gradually added to perform saponification. When saponification was completed, the remaining (5) to (9) were added and stirred until homogeneous. The mixture was cooled to 40° C., mixed and pulverized (10) to (11) were added thereto, and cooled to room temperature while stirring and mixing to obtain the desired body shampoo. The obtained body shampoo had a unique light color and was not powdery.

Prescription 16: Soap (solid)
Ingredients Mixing ratio (g/kg)
(1) Fatty acid alkali metal salts (lauric acid 380g/kg, myristic acid 370g/kg, palmitic acid 150g/kg, stearic acid 100g/kg) (potassium:sodium=1:5) 940
(2) Cocamidopropyl betaine 30
(3) Glycerin 20
(4) Pigment described in Example 1 3
(5) Brown iron oxide pigment A 7
(Manufacturing method)
(1) was dissolved by heating, (2) to (5) were added and mixed, and the mixture was further homogenized using a three-roll mill. Next, the obtained mixture was kneaded and compressed using an extruder, extruded into a rod shape, and then molded to obtain the desired soap. The obtained soap had a unique light color and was not powdery.

Formulation 17: Powdered bath additive Ingredients Mixing ratio (g/kg)
(1) Sodium sulfate 860
(2) Sodium hydrogen carbonate remainder (3) Sodium glutamate 20
(4) Silica (Sunsphere (registered trademark) H-52 manufactured by AGC SI Tech) 10
(5) Pigment described in Example 1 2
(6) Brown iron oxide pigment A 4
(7) Yellow iron oxide pigment 2
(8) Vanillyl butyl ether 2
(9) Capsicum extract 1
(Manufacturing method)
(1) to (9) were uniformly mixed in a Henschel mixer to obtain the desired powdered bath additive. When the obtained powdered bath additive was dissolved in hot water, it had a color reminiscent of wood and was not powdery.

Formulation example 18: Peel-off pack Ingredients Mixing ratio (g/kg)
(1) PEG1500 80
(2) PEG/PPG-25/30 copolymer 60
(3) Xanthan gum 2
(4) Sodium citrate 3
(5) Citric acid 1
(6) Purified water Remaining (7) Polyvinyl alcohol 100
(8) Polysorbate-80 2
(9) Silica (Sunsphere (registered trademark) H-51 manufactured by AGC SI Tech) 40
(10) Talc 80
(11) Brown iron oxide pigment B 8
(12) Pigment described in Example 1 2
(13) Alkyl acrylate copolymer emulsion 50
(14) Methylparaben 2
(15) Ethanol 80
(Manufacturing method)
The mixed and pulverized (9) to (12) were added to the heated and dissolved (1) to (8), uniformly dispersed, and then cooled to 40°C. Next, (13) to (15) were added, and the mixture was stirred and cooled to room temperature to obtain the desired peel-off pack. The obtained peel-off pack had a brownish color and was not powdery.

Formulation 19: Toothpaste Ingredients Mixing ratio (g/kg)
(1) Calcium carbonate 290
(2) Pigment A3 described in Example 1
(3) Red No. 202 5
(4) Sorbitol liquid 37
(5) Glycerin 35
(6) Guar gum 30
(7) Distilled water 600
(Manufacturing method)
(1) to (3) were weighed and added to (7), and stirred for 5 minutes using a ROBOMICS fMODEL dissolver manufactured by Tokushu Kiki Co., Ltd. (4) to (6) were further added while stirring, and when the viscosity of the mixture increased, stirring was stopped. The resulting toothpaste had a light color and had enough viscosity to be put into a tube and enough fluidity to get the abrasive into the crevices of the teeth.

Claims (7)

For cosmetic compositions, the value K obtained by dividing coercive force (kA/m) by specific surface area (m ² /g) when an external magnetic field is 397.9 kA/m is 1.50 or more and 3.90 or less magnetic iron oxide pigment. The magnetic iron oxide pigment according to claim 1, having a specific surface area of 1.1 m ² /g or more and 4.0 m ² /g or less. The magnetic iron oxide pigment according to claim 1 or 2, having an oil absorption of 25 g/100 g or more and 40 g/100 g or less, and a bulk density of 0.25 g/mL or more and 0.36 g/mL or less. reacting an aqueous ferrous salt solution with an alkali hydroxide to form a ferrous hydroxide slurry; and oxidizing the ferrous hydroxide by blowing an oxygen-containing gas into the ferrous hydroxide slurry under heating. thing,
A method for producing a magnetic iron oxide pigment according to claim 1 or 2, comprising:
The Fe concentration in the ferrous hydroxide slurry is 25 g/L or more and 35 g/L or less, and
The above production method, characterized in that alkali hydroxide is added in an amount such that the concentration of hydroxide ions (OH ⁻ ) that do not form ferrous hydroxide is 80 mmol/L or more and 240 mmol/L or less. An iron oxide pigment having a coating on the surface of the magnetic iron oxide pigment according to claim 1 or 2. A cosmetic composition containing the magnetic iron oxide pigment according to claim 1 or 2. The cosmetic composition according to claim 6, which is a skin cosmetic.