JP2002003744A - Sintered composite pigment and cosmetic comprising the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pigment and a cosmetic capable of providing a natural finish having a bare skin feeling and transparency while uniformly covering the color shading such as dermal stains or ephelides when formulated in the cosmetic. SOLUTION: This sintered composite pigment is obtained by mixing a flaky powder having 0.1-50 μm average primary particle diameter and 3-50 aspect ratio with a particulate iron oxide having 0.01-0.3 μm average primary particle diameter and at least one kind selected from alumina, silica, zirconia, titanium oxide, zinc oxide, boron nitride, aluminum hydroxide and barium sulfate having 0.01-0.3 μm average primary particle diameter and sintering the resultant mixture. The cosmetic is prepared by formulating the sintered composite pigment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered composite pigment, particularly to a pigment for improving the finish of cosmetics.

[0002]

2. Description of the Related Art In cosmetics, especially makeup cosmetics such as foundations, conventionally, white pigments such as titanium oxide and zinc oxide and coloring pigments such as iron oxide have been used to adjust the color tone. As extenders, extenders such as mica, talc, kaolin, and sericite are also used. Among them, titanium oxide has a refractive index of 2.5 to
2.7, which is the highest among powders for cosmetics and has strong hiding power.
Therefore, usually, such a compounding of titanium oxide gives an appropriate covering power to foundations, face powders and the like.

[0003]

However, with the use of titanium oxide, skin color unevenness such as spots and freckles can be concealed but lacks luster. This may result in a flat white finish, which may cause a problem that a bare skin feeling and a transparent feeling cannot be obtained. On the other hand, if the amount of titanium oxide is reduced, spots and freckles are not sufficiently concealed, so that defects of the bare skin may not be corrected and a uniform finish may not be obtained, and also in terms of natural finish and transparency. Not enough. This is because the refractive index of titanium oxide is too high compared to the refractive index of the skin (about 1.56).

As a solution to the problem of titanium oxide, a flesh-colored sintered pigment obtained by calcining titanium oxide and iron oxide has been reported (JP-A-7-3181).
No.). However, even such a sintered pigment is not satisfactory in terms of natural finish and transparency, and further improvement has been desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a modest concealing property close to the refractive index of the skin, a color close to the skin tone, and It is an object of the present invention to provide a pigment and a cosmetic which can provide a natural finish with a bare skin feeling and a transparent feeling while uniformly covering color unevenness such as spots and freckles when blended in a pigment.

[0006]

Means for Solving the Problems In order to solve the above-mentioned object, the present inventors have conducted intensive studies. As a result, flaky powder, fine-particle iron oxide, and certain fine-particle powder were mixed and fired. The inventors have found that the sintered composite pigment obtained by the above solves the above problems, and have completed the present invention. That is, the sintered composite pigment according to the present invention has an average primary particle diameter of 0.1 to 50 μm, a flaky powder having an aspect ratio of 3 to 50, and a fine iron oxide particle having an average primary particle diameter of 0.01 to 0.3 μm. Mixing and baking with at least one kind of fine particle powder selected from alumina, silica, zirconia, titanium oxide, zinc oxide, boron nitride, aluminum hydroxide, and barium sulfate having an average primary particle diameter of 0.01 to 0.3 μm. It is characterized by being obtained by.

In the present invention, the fine particle powder is preferably alumina. Further, it is preferable that the fine particle powder is zinc oxide. Preferably, the fine particle powder is titanium oxide. Further, the total coating amount of the fine particle iron oxide and the fine particle powder is 0.1 to 20 with respect to the flaky powder.
It is preferred that it is weight%.

It is preferable that the coating amount of the fine iron oxide particles is 0.05 to 5% by weight based on the flaky powder. Further, the coating amount of the fine particle powder is preferably 0.05 to 19% by weight based on the flaky powder. A cosmetic according to the present invention is characterized by incorporating any one of the sintered composite pigments described above. The method for producing a sintered composite pigment according to the present invention comprises a flaky powder having an average primary particle diameter of 0.1 to 50 μm and an aspect ratio of 3 to 50, and a fine iron oxide particle having an average primary particle diameter of 0.01 to 0.3 μm. Alumina having an average primary particle diameter of 0.01 to 0.3 μm, silica, zirconia, titanium oxide, zinc oxide, boron nitride, aluminum hydroxide, and at least one of fine particle powders selected from barium sulfate, and mixed. It is characterized by firing at 300 to 1100 ° C.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The sintered composite pigment of the present invention can be obtained by mixing and firing a flaky powder, fine iron oxide particles and fine powder particles. In the present invention, the flaky powder used as the substrate may be any of natural and synthetic powders as long as the powder has an average primary particle diameter of 0.1 to 50 μm and an aspect ratio (average primary particle diameter / average thickness) of 3 to 50. Yes, but in terms of availability, titanium mica, sericite, mica,
Preferred are talc, kaolin, synthetic mica, barium sulfate, boron nitride, bismuth oxychloride, alumina and the like.
In the present invention, one or more of these can be used.

If the particle size of the flaky powder is too small, it is inferior in feel such as smoothness at the time of coating, and if it is too large, the powder may become rough or glossy at the time of coating. Further, by setting the aspect ratio within the above range, appropriate hiding properties and gloss can be obtained. The average primary particle diameter of the fine iron oxide particles used in the present invention is 0.01 to 0.3 μm.
It is. Bengala (α-Fe ₂ O ₃ ) as iron oxide,
Yellow iron oxide (α-FeOOH) or a mixture thereof is suitably used, and yellow iron oxide is particularly preferable.

The average primary particle diameter of the fine particle powder used in the present invention is 0.01 to 0.3 μm. As the fine particle powder, a fine particle powder having a refractive index in the range of 1.4 to 2.7 is suitably used. As such a powder, alumina, silica, zirconia, titanium oxide, zinc oxide,
One or more selected from boron nitride, aluminum hydroxide, and barium sulfate are exemplified. If the refractive index of the fine particle powder is too low, the hiding power may be insufficient,
On the other hand, if it is too high, the concealing power is too high, so that the finished transparency or bare skin feeling may not be obtained.

In the sintered composite pigment of the present invention, these essential powder components are dry-mixed with a Henschel mixer or the like, and the mixture is air-mixed at 300 to 1100 ° C., preferably 600 to 950.
After sintering at 1 ° C. for 1 to 5 hours, it can be obtained by pulverization and classification. The composite pigment may be subjected to a surface treatment that is usually performed on cosmetic powders, as long as the effects of the present invention are not impaired. For example, it can be treated with silicone, metal soap, lecithin, amino acid, collagen, fluorine compound and the like.

A wet method is also known as a method of compounding two or more kinds of fine particle powders on the surface of the flaky powder. However, a conventional wet method in which the fine particle powders are successively adhered and coated is applied to a layered compound. And the physical properties and characteristics of each fine particle powder are hardly expressed.In addition, it is very difficult to control the ratio of each fine particle powder by the coprecipitation method. It is thought that the specular gloss of the flaky powder is not easily reduced.

The mixing ratio of the flaky powder, the fine iron oxide particles and the fine powder is appropriately determined depending on the desired coating amount, but the total amount of the fine iron oxide particles and the fine powder to the flaky powder (total covering ratio) is not more than 0.1%. 1 to 20% by weight, further 0.3
It is preferably from 10 to 10% by weight. When the content is less than 0.1% by weight, the surface gloss of the flaky powder is not gradually reduced, and natural gloss cannot be obtained, or an appropriate hiding power cannot be imparted, and uneven skin color cannot be covered. Cause problems. On the other hand, when the content exceeds 20% by weight, it becomes difficult to compound all the fine particle components due to an excessive amount of fine particle iron oxide and fine particle powder, and the non-composite fine particle components aggregate. The feeling of use such as roughness may be deteriorated.

The amount of the fine iron oxide particles is 0.05
It is preferably about 5% by weight. If the amount of the particulate iron oxide is too small, the powder will not be colored, so that a desired natural finish may not be obtained even when blended into a cosmetic.
On the other hand, if the amount of the fine particle iron oxide is too large, the coloring is too strong, and if it is blended with a cosmetic, an unnatural finish may still be obtained. Also, the gloss tends to be impaired. The amount of the fine particle powder is 0.05 to 19% by weight. If the amount of the fine particle powder is too small, the hiding power is insufficient and the color unevenness cannot be covered. If the amount is too large, the hiding power is too strong and an unnatural finish may be obtained. In the present invention, the coating amounts of the fine particle iron oxide and the fine particle powder are calculated from the charged amounts.

The composite pigment of the present invention has a yellow to red color (earth color) close to the skin tone, and has a hue (H) of 5R to 5Y in a Munsell display system. In addition, when used in cosmetics, especially make-up cosmetics of skin color such as foundation, it has a natural finish with a transparent feeling while covering skin color unevenness such as spots and freckles. It can be. This is inferred as follows. In the sintered composite pigment of the present invention, the flaky powder is randomly and thinly and uniformly coated with fine-particle iron oxide and fine-particle powder having a refractive index of 1.4 to 2.7, such as alumina and zinc oxide, and is subjected to light scattering. A suitable concealing property is provided, and the specular gloss (glare) of the flaky powder is reduced. As a result, it is possible to give a bare skin feeling and a natural luster while naturally covering dullness and freckles on the skin. It is considered possible. In addition, the color is colored yellow-orange by the fine-particle iron oxide, and the color tone becomes similar to the skin tone, so that a more natural and natural finish can be obtained. Furthermore, since the obtained pigment maintains a flaky shape comparable to the flaky powder of the substrate, it has very good adhesion to the skin and can effectively and uniformly cover skin color unevenness. it can.

In the present invention, it is important that the fine iron oxide particles and the fine powder particles have the above average primary particle diameter. If the average primary particle size is too large, it cannot be coated thinly and uniformly on the flaky powder of the substrate, so that the obtained sintered composite pigment does not sufficiently exhibit the adhesion to the skin and an appropriate gloss, The finished skin feel may be reduced.

In the cosmetic according to the present invention, the sintered composite pigment can be usually added in an amount of 0.1 to 70% by weight.
In order to sufficiently exhibit the effect of covering stains, freckles, and the like, it is desirable to mix at least 3% by weight, preferably 5% by weight or more in the cosmetic. On the other hand, if the compounding amount is too large, the concealing property and gloss as a cosmetic may be too strong to give an unnatural finish.
% Or less, more preferably 35% by weight or less.

The cosmetic of the present invention may contain other cosmetic powders. For example, titanium oxide, zinc oxide, red iron oxide, yellow iron oxide, black iron oxide, ultramarine, cerium oxide, talc, mica, sericite, kaolin, bentonite, clay, silicic acid, silicic anhydride, magnesium silicate, zinc stearate Inorganic such as fluorinated phlogopite, synthetic talc, barium sulfate, magnesium sulfate, calcium sulfate, boron nitride, bismuth oxychloride, alumina, zirconium oxide, magnesium oxide, chromium oxide, calamine, magnesium carbonate, and composites thereof Powders: Organic powders such as silicone powder, silicone elastic powder, polyurethane powder, cellulose powder, nylon powder, PMMA powder, starch, polyethylene powder, and composites thereof. These powders may be surface-treated.

Further, other cosmetic ingredients can be blended. For example, as an oil component, liquid paraffin, solid paraffin, hydrocarbon oils such as petrolatum and ceresin, ester oils such as isopropyl myristate, natural oils and fats, waxes such as perfluoropolyether, lanolin, carnauba wax, fatty acids, higher alcohols, and silicones Resins such as resin, fluororesin, acrylic resin, and vinylpyrrolid resin are exemplified. In addition, alcohols, polyhydric alcohols, pigments, pH adjusters, humectants, thickeners, surfactants,
Dispersants, stabilizers, coloring agents, preservatives, antioxidants, ultraviolet absorbers, fragrances, and the like can also be appropriately compounded.

As the cosmetics of the present invention, make-up cosmetics are particularly suitable, and emulsified foundations, powder foundations, oily foundations, face powders, eye shadows, cheek colors, lipsticks, body powders, perfume powders, baby powders, Base cosmetics and the like can be mentioned. Incidentally, the composite pigment of the present invention,
In addition to cosmetics, the present invention can be applied to product fields using pigments such as paints.

Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited thereto. Unless otherwise specified, the amounts are shown in% by weight. Production Example 1 For an interference type mica titanium particle having an average primary particle diameter of about 30 μm and an aspect ratio of about 35, an average primary particle diameter of about 0.1 μm was obtained.
1.0 wt% of 2 μm fine iron oxide yellow particles and 8.0 wt% of fine alumina particles having an average primary particle diameter of 0.03 μm were mixed with a Henschel mixer. This was filled in a crucible, baked at 900 ° C. for 2 hours in an electric furnace, cooled and pulverized to obtain a sintered composite pigment in which mica titanium was simultaneously coated with red iron oxide and alumina.

Comparative Example 1A The same procedure as in Production Example 1 was carried out except that only the interference-type titanium mica and the fine yellow iron oxide particles were used for calcination to obtain a sintered composite pigment in which the mica titanium surface was coated with red iron oxide. Comparative Example 1B In the same manner as in Production Example 1, sintering was performed in the same manner using only the interference-type titanium mica and the fine-particle alumina to obtain a sintered composite pigment in which the mica titanium surface was coated with red iron oxide.

Production Example 2 0.2% by weight of fine iron oxide yellow particles having an average primary particle diameter of about 0.255 μm and an average primary particle diameter of 0.01 with respect to sericite having an average primary particle diameter of about 30 μm and an aspect ratio of about 43.
6.0 μ% of fine particle alumina having a particle diameter of 6.0 μm was mixed with a Henschel mixer. This is filled in a crucible, and 800
After calcination at 1 ° C. for 1 to 4 hours, the mixture was cooled and pulverized to obtain a sintered composite pigment in which the surface of sericite was simultaneously coated with red iron oxide and alumina.

Comparative Example 2A The same procedure as in Production Example 2 was carried out except that only the sericite and the fine yellow iron oxide particles were fired to obtain a sintered composite pigment in which the surface of the sericite was coated with red iron oxide. Comparative Example 2B In the same manner as in Production Example 2, calcining was carried out using only sericite and fine-particle alumina, to obtain a sintered composite pigment in which the surface of sericite was coated with red iron oxide.

Production Example 3 0.1% by weight of fine yellow iron oxide particles having an average primary particle diameter of about 0.25 μm and an average primary particle diameter of 0.03 μm to synthetic mica having an average primary particle diameter of about 40 μm and an aspect ratio of about 50
3.0 wt% of the fine zinc oxide (m) was mixed with a Henschel mixer. This is filled in a crucible and heated in an electric furnace at 900 ° C.
After baking for 1 to 4 hours, the mixture was cooled and pulverized to obtain a sintered composite pigment in which the surface of synthetic mica was simultaneously coated with red iron oxide and zinc oxide.

Production Example 4 With respect to barium sulfate having an average primary particle diameter of about 28 μm and an aspect ratio of about 36, 0.5 wt% of fine yellow iron oxide having an average primary particle diameter of about 0.25 μm and an average primary particle diameter of 0.03 μm
3.0 wt% of m-particulate silica was mixed with a Henschel mixer. This was filled in a crucible, baked in an electric furnace at 700 ° C. for 1 to 4 hours, and then cooled and pulverized to obtain a sintered composite pigment in which bargaric sulfate was coated on the surface with silica and silica simultaneously.

Production Example 5 For an interference type mica titanium particle having an average primary particle diameter of about 20 μm and an aspect ratio of about 33, an average primary particle diameter of about 0.1 μm was obtained.
1.0% by weight of 0.3 μm fine yellow iron oxide and 6% by weight of fine titanium oxide having an average primary particle diameter of 0.02 μm were mixed with a Henschel mixer. This was filled in a crucible, baked in an electric furnace at 900 ° C. for 1 to 3 hours, and then cooled and pulverized to obtain a sintered composite pigment in which the surface of the interference type mica titanium was simultaneously coated with red iron oxide and titanium oxide.

Practical test The test cosmetics were applied to the faces of 20 female panelists, and evaluated for covering effect against color unevenness such as dull skin, spots, freckles, etc., naturalness of finish, luster with bare skin feeling, and transparency. Was done. ◎: 17 or more panelists who answered good ○: 12 to 16 panelists who answered good △: 9 to 11 panelists who answered good ×: 5 to 8 panelists who answered good XX: No more than 4 panelists answered good

Test Example 1 Powder Foundation A powder foundation was prepared according to the following formulation by a conventional method and evaluated. (Formulation) Sericite 17% by weight Synthetic mica 10 Talc to 100 Test powder (Table 1) 12 Bengala 0.8 Yellow iron oxide 2 Black iron oxide 0.1 Silicone elastic powder 1 Spherical polyethylene 4 Dimethylpolysiloxane 3 Liquid paraffin 5 Vaseline 5 Sorbitan sesquiisostearate 1 Paraben qs Antioxidant qs Flavor qs

[0031]

[Table 1] Test powder Cover effect Naturalness Gloss Transparency  Production Example 1 ○ ◎ ◎ ◎ Interfering titanium mica ×× ×× ×× × Comparative Example 1 × △ △ △Comparative Example 2 △ × △ △ 

As can be seen from Table 1, in the case of using the interference type mica titanium which is the substrate of Production Example 1, no cover effect was obtained, and the finish evaluation was very low. Further, simply treating the interfering titanium mica with the fine yellow iron oxide or the fine alumina does not sufficiently improve any of the evaluation items. On the other hand, when fine particles of yellow iron oxide and fine particles of alumina are simultaneously treated with the interference type mica titanium, the cover effect is very excellent, and the natural finish of the finish, the gloss with a bare skin feeling, and the transparency are good. there were.

Test Example 2 Dual-Purpose Powder Foundation Silicone-treated mica to 100 Silicone-treated talc 15 Test powder (Table 2) 24 Fine particle titanium oxide treated with aluminum stearate 6 Silicone-treated bengara 1.2 Silicone-treated iron oxide yellow 2.5 Silicone-treated black oxide Iron 0.9 Polyurethane powder 6 Paraben proper amount Dimethyl polysiloxane 4 methylphenyl polysiloxane 3 octyl methoxycinnamate 3 polyether modified silicone 2 antioxidant proper amount perfume proper amount

[0034]

[Table 2] Test powder Cover effect Naturalness Gloss Transparency  Silicone treatment production example 2 ◎ ◎ ○ ◎ Silicone treatment sericite ×× ○ △ × Silicone treatment comparative example 2A △ ○ △ △Silicone treatment comparative example 2B ○ △ △ △ 

From Table 2, it can be seen that the effect of the sintered composite pigment of the present invention is not impaired even by surface treatment with silicone or the like.
It is understood that excellent effects are exhibited even in comparison with the silicone-treated Comparative Examples 2A and 2B.

Test Example 3 Amount The face powder (white powder) was prepared according to the following formulation while changing the amount of the sintered composite pigment (Production Example 3), and evaluated. Table 3 shows the results. Talc to 100% by weight Production Example 3 3-40 Fine particle titanium oxide 3 Spherical silicone powder 8 Vaseline 1 Squalane 3 Ester oil 1 Paraben Suitable amount Antioxidant Suitable amount Perfume Suitable amount

[0037]

[Table 3] Amount (% by weight) Cover effect Naturalness Gloss Transparency  3 △ ○ △ △ 10 ○ ◎ ◎ ○ 25 ◎ ◎ ○ ◎ 35 ◎ ○ ○ ◎40 ◎ △ △ ○

If the amount of the sintered composite pigment is too small, the cover effect and the finished feeling will not be sufficiently exhibited, and if it is too large, the finished will also tend to be unnatural. Therefore, the compounding amount of the sintered composite pigment in the cosmetic is 3 to 40% by weight, and more preferably 5 to 40% by weight.
35% by weight is preferred.

Test Example 4 Powder Particle Size Production was performed in the same manner as in Production Example 1, except that the average primary particle diameter of yellow iron oxide and alumina was changed. Evaluation was performed in the same manner as in Test Example 1 using the obtained sintered pigment. Table 4 shows the results.

[0040]

[Table 4]  Average primary particle size (μm) Cover effect Naturalness Gloss TransparencyYellow iron oxide Alumina  0.2 0.03 ○ ◎ ◎ ◎ 0.2 0.2 ○ ○ ◎ ○ 0.2 0.5 ○ △ ○ △ 0.03 0.03 ○ ○ ◎ ◎0.5 0.03 ○ △ △ △

As shown in Table 4, when the particle size of the fine yellow iron oxide particles and the fine particle powders increases, the finished feeling decreases.
The average primary particle diameter of the fine particle component is from 0.01 to 0.1.
It is understood that 3 μm is preferred.

Test Example 5 Proportion of Powder Production was carried out in the same manner as in Production Example 1, except that the mixing ratio of the fine yellow iron oxide particles and the fine alumina particles was changed. Evaluation was performed in the same manner as in Test Example 1 using the obtained pigment. Table 5 shows the results
Shown in

[0043]

[Table 5]  Amount to substrate (wt%) Cover effect Naturalness Gloss TransparencyYellow iron oxide Alumina  0.01 8.0 ○ △ ◎ ◎ 1.0 8.0 ○ ◎ ◎ ◎ 5.0 8.0 ◎ ○ ○ ○ 8.0 8.0 ◎ △ △ △ 1.0 16.0 ◎ ○ ○ ○ 1.0 0.01 × ○ ○ ○1.0 20.0 ◎ △ △ ×

From Table 5, it can be seen that the fine iron oxide particles and the fine particle powder were 0.05 to 5% by weight,
5-19% by weight has been suggested to be suitable.

[0045]

Example 1 Example 1 W / O-type emulsified cream foundation talc 8% by weight sericite 7 Production Example 4 12 Bengala 0.3 Yellow iron oxide 1.2 Black iron oxide 0.6 Spherical polyethylene powder 6 Squalane 10 Olive oil 10 Stearin Acid 2 glyceryl monostearate 2 POE (40) sorbitan monostearate 2 glycerin 5 triethanolamine 0.8 pH adjuster qs Preservative qs ion exchange water to100

Example 2 W / O-type emulsified liquid foundation Silicon-treated mica 8% by weight Silicon-treated sericite 7 Silicon-treated production example 5 5 Silicon-treated titanium oxide 7 Silicon-treated iron oxide 3 Spherical PMMA powder 4 Cyclic dimethylpolysiloxane to 100 dimethyl Polysiloxane 4 squalane 3 polyether-modified silicone 2 sorbitan sesquiisostearate 1 dispersant qs dipropylene glycol 2 ion exchange water 20 paraben qs antioxidant qs perfume qs

[0047]

According to the present invention, there is provided a pigment which, when incorporated into a cosmetic, can provide a natural finish with a bare skin feeling and transparency while uniformly covering color unevenness such as spots and freckles. You can get cosmetics.

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Claims (9)

[Claims] 1. A flaky powder having an average primary particle diameter of 0.1 to 50 μm and an aspect ratio of 3 to 50, a fine iron oxide having an average primary particle diameter of 0.01 to 0.3 μm, and an average primary particle diameter of 0.01. It is obtained by mixing and firing at least one kind of fine particle powder selected from alumina, silica, zirconia, titanium oxide, zinc oxide, boron nitride, aluminum hydroxide, and barium sulfate having a particle size of up to 0.3 μm. Sintered composite pigment. 2. The sintered composite pigment according to claim 1, wherein the fine particle powder is alumina. 3. The sintered composite pigment according to claim 1, wherein the fine particle powder is zinc oxide. 4. The sintered composite pigment according to claim 1, wherein the fine particle powder is titanium oxide. 5. The pigment according to claim 1, wherein the total coating amount of the fine-particle iron oxide and the fine-particle powder is 0.1 to 20% by weight based on the flaky powder. Sintered composite pigment. 6. The sintered composite according to claim 1, wherein the coating amount of the fine iron oxide particles is 0.05 to 5% by weight based on the flaky powder. Pigment. 7. The pigment according to claim 1, wherein the coating amount of the fine particle powder is 0.1 to 1.0 with respect to the flaky powder.
A sintered composite pigment having a content of from 0.5 to 19% by weight. 8. A cosmetic comprising the sintered composite pigment according to claim 1. 9. A flaky powder having an average primary particle diameter of 0.1 to 50 μm and an aspect ratio of 3 to 50, a fine iron oxide having an average primary particle diameter of 0.01 to 0.3 μm, and an average primary particle diameter of 0.01. A fine particle powder selected from the group consisting of alumina, silica, zirconia, titanium oxide, zinc oxide, boron nitride, aluminum hydroxide, and barium sulfate;
A method for producing a sintered composite pigment, characterized by firing at 00 ° C.