JP2001172529A - Synthetic colored kaolin, production method therefor, and cosmetics using same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a colored pigment which can easily provide a color tone in the range from flesh color (pale orange) to red with a high reproducibility, is excellent in easiness of spreading and slipperiness, and facilitates delicate coloring adjustment. SOLUTION: The colored kaolin of the invention, as a coloring pigment for accomplishing the purpose, is prepared by thermally treating a mixture of a kaolin mineral with potassium silicofluoride, has a content of iron (III) oxide of 0.50-1.10 wt.% and a sum of contents of titanium oxide and magnesium oxide of lower than 0.20 wt.%, and is used, for example, as a mixture with other ingredients usually compounded into cosmetics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD [0001] The present invention has a good touch,
Highly slippery, colored kaolin that realizes a stable coloring state with high reproducibility, and a method for producing the same and cosmetics using the same, particularly suitable for makeup cosmetics such as foundations, blushers, nail cosmetics, etc. Colored kaolin.

[0002]

2. Description of the Related Art Conventionally, for coloring cosmetics, for example,
A method of mixing a naturally occurring iron oxide pigment such as red iron oxide, yellow iron oxide, and black iron oxide with a white cosmetic raw material powder serving as a base material and mixing a colored pigment obtained by firing. Is widely used. Above all, in order to prepare a red-based cosmetic from pale yellow-red (pale orange, hereinafter referred to as "skin color"), a method of adding a small amount of red iron oxide to a white base powder has been adopted.

However, the above-mentioned skin color cosmetics include:
(1) The color tone is limited to brown to red, which is the characteristic of reddish brown, which is a characteristic of red bengara, and it is difficult to adjust the subtle color scheme according to human skin. Difficult to reproduce, (2) Natural iron oxide pigments such as red iron oxide have low color reproduction stability due to the presence of impurities, and (3) irregular shaped pigments where red iron oxide does not have a plate-like shape Therefore, there is a problem that a granular feeling peculiar to the granular pigment is generated, lightness of elongation to skin and slipperiness are reduced.

[0004]

In recent years, instead of red iron oxide, a natural iron oxide red pigment, iron oxide red pigments synthesized mainly by a wet method using iron sulfate or iron chloride as a raw material have been replaced with iron oxide red pigments. Attempts have been made to solve the above problems (1) and (2) by using the same. As the above-mentioned synthetic iron oxide-based red pigment, those obtained by coating the surface of titanium dioxide-coated mica particles with triiron tetroxide and performing a surface treatment (Japanese Patent Application Laid-Open No.
JP-A-1-19666) and an intermediate layer made of a metal oxide or a hydrate thereof and a coating outer layer made of triiron tetroxide are provided on the surface of a base powder, and further heat-treated to develop a reddish color. (Japanese Patent Laid-Open No. Sho 62-174002) is known.

However, the red pigment described in Japanese Patent Application Laid-Open No. 61-19666 has a complicated processing step, and the pigment itself has a pearl luster. There is a problem of being limited. Further, the pigment described in JP-A-62-174002 has a problem that many steps are required to turn red, such as formation of an intermediate layer or a coating outer layer, and a slight shift easily occurs in terms of color tone processing accuracy. is there.

On the other hand, by appropriately setting the particle shape of the iron oxide-based red pigment to be incorporated in the cosmetic, the above (3)
Attempts have been made to solve this problem. As such an attempt, there is known a cosmetic (JP-A-63-72616) containing a plate-like red iron oxide obtained from a three-component aqueous slurry of a ferric salt, tartaric acid and an alkali compound. However, the red iron oxide compounded in the cosmetic described in JP-A-63-72616 has a plate-like particle shape, so that it has better lightness and slipperiness to the skin than conventional skin-color pigments. However, like Bengala,
The conventional problem that the color tone is limited from brown, which is mainly brown to red, to red, which makes it difficult to adjust subtle color adjustments to suit human skin, and it is difficult to reproduce light red color schemes efficiently, especially Has not been resolved.

[0007] Therefore, it is possible to easily obtain a color tone from a skin color to a reddish human skin with high reproducibility, further improve the tactile sensation, improve lightness of elongation and improve slipperiness. There is a demand for obtaining a color pigment which can easily perform fine color adjustment by mixing with a white base powder. An object of the present invention is to provide a synthetic colored kaolin capable of achieving the above object and a method for producing the same,
And a cosmetic using the synthetic colored kaolin.

[0008]

Means for Solving the Problems and Effects of the Invention The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found that kaolin mineral, which is a kind of layered silicate mineral, and potassium silicofluoride are used. About synthetic kaolin obtained by heat-treating the mixture, its iron oxide (III) (Fe ₂ O ₃ ), titanium oxide (TiO ₂ ), and magnesium oxide (Mg)
By setting the content of O) in each of the predetermined ranges, the synthetic kaolin can be colored from flesh color to red, and the same color tone can be easily expressed in such a range with high reproducibility. Can,
Furthermore, it is excellent in both the tactile sensation, the lightness of elongation, and the slipperiness, and it is quite possible to obtain a color pigment that can easily perform fine color adjustment by mixing with a white base powder. We found a new fact and completed the synthetic colored kaolin of the present invention.

That is, the synthetic colored kaolin of the present invention is
A synthetic colored kaolin obtained by subjecting a mixture of a kaolin mineral and potassium silicofluoride to a heat treatment, wherein the content of iron (III) oxide is 0.50 to 1.10% by weight in the synthetic colored kaolin, and The total content of titanium and magnesium oxide is 0.25% by weight in the synthetic colored kaolin.
Less than. The synthetic colored kaolin of the present invention needs to contain a predetermined amount of iron (III) oxide which contributes to color development in the range from flesh to red, and at the same time, magnesium oxide or oxide which inhibits color development in the above range. It is necessary that the content of titanium be kept below a certain value.

[0010] The synthetic colored kaolin of the present invention is different from iron oxide-based coloring pigments blended in conventional cosmetics, in that kaolin itself used as a base powder of cosmetics has a flesh to red color tone. It was done. Therefore, the synthetic colored kaolin according to the present invention can be used as one of the base powders of cosmetics, that is, mixed with the conventional base powder, or used in place of the conventional base powder. be able to. In addition, the above-mentioned synthetic colored kaolin has a low level of color tone reproducibility, which is unique to conventional coloring pigments such as red iron oxide, and a touch, poor elongation to the skin, etc., which have been improved in each step. When mixed with the base powder,
Fine color adjustment can be easily performed without causing color tone variation. Moreover, the obtained cosmetic has a good tactile sensation, and is excellent in lightness of elongation and excellent slipperiness.

The synthetic colored kaolin of the present invention is intended to improve colorability in the range from flesh to red.
The mixing ratio of the kaolin mineral and the potassium silicofluoride before the heat treatment is 40:60 to 80:20 by weight.
It is preferred that In addition, the synthetic colored kaolin of the present invention has a tactile sensation when used as a cosmetic, lightness of elongation, and even better slipperiness. Thickness 0.01-0.1
It is preferably a plate-like particle of μm.

The method for producing a synthetic colored kaolin according to the present invention comprises the steps of:
The mixture is mixed at a weight ratio of 60 to 80:20, and the mixture is heat-treated in a closed container at 400 to 900 ° C for 0.25 to 24 hours. In addition, the method for producing the synthetic colored kaolin is such that after heat treatment, it is further dispersed in water, and then sulfuric acid acid obtained by adding 0.001 to 40% by weight of aluminum sulfate and 0.001 to 30% by weight of iron sulfate. A method of performing the treatment in a solution may be used.

The synthetic colored kaolin of the present invention is different from the conventional colored pigment synthesized through a complicated process, in that a mixture of kaolin mineral and potassium silicofluoride mixed in a predetermined ratio is subjected to a heat treatment to intercalate the mixture. Or a stirring method in a predetermined sulfuric acid solution. In the method for producing the synthetic colored kaolin, after the heat treatment of the mixture of the kaolin mineral and the potassium silicofluoride and before the stirring treatment in the sulfuric acid solution, the pulverizing treatment by shearing is performed. Is performed in a more preferred embodiment from the viewpoint that the particle shape of the synthetic colored kaolin is made into a plate shape, and the feel, the lightness of elongation, and the slipperiness are further improved.

The cosmetic of the present invention contains the above-mentioned synthetic colored kaolin of the present invention. Since the cosmetic of the present invention uses the synthetic colored kaolin according to the present invention as one of the base powders, it is easy to finely adjust the color scheme, has a good tactile sensation, and has a low elongation. Excellent pod slipperiness.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Colored kaolin and its production method]
Next, the synthetic colored kaolin of the present invention and a method for producing the same will be described in detail. (Raw materials) Kaolin minerals (kaolinites) used in the production of synthetic colored kaolin include naturally occurring kaolinite, nacrite, dickite, and halloysite.
At least one kind may be sufficient.

The content of iron (III) oxide in the kaolin mineral is not particularly limited. In addition, the content of titanium oxide and magnesium oxide in the kaolin mineral is not particularly limited, but particularly regarding the total content of titanium oxide and magnesium oxide, the content of kaolin mineral and hydrous mineral salt Since the content in the synthetic colored kaolin obtained by the heat treatment needs to be less than 0.25% by weight, the content is preferably as low as possible even at the raw material stage.

The above-mentioned kaolin mineral has an average major axis of 0.1 to 20 μm in order to make the synthetic colored kaolin according to the present invention good in feel, lightness of elongation to the skin, and slipperiness.
m, the average thickness is preferably about 0.01 to 0.5 μm. Potassium silicofluoride used in the production of synthetic colored kaolin is used for so-called intercalation, in which the hydroxyl groups in kaolin minerals are replaced with fluorine during heat treatment. The distance can be adjusted to an appropriate one.

The potassium silicofluoride has an average particle size of from 0.01 to 0.01 in order to make the synthetic colored kaolin according to the present invention have a good feel, a low elongation to the skin and a good sliding property.
It is preferably about 20 μm. For the production of the synthetic colored kaolin of the present invention, the mixing ratio of the kaolin mineral and potassium silicofluoride depends on the color development of the synthetic colored kaolin, and further, after heat treatment, the iron oxide in the synthetic colored kaolin ( III) is appropriately set according to the contents of titanium oxide and magnesium oxide. Therefore, although it is not particularly limited in the present invention, in order to realize skin-colored to reddish coloring suitable for application to cosmetics, kaolin mineral and potassium silicofluoride are usually used in a ratio of 40:60 to 80. : 20, preferably at a weight ratio of 50:50 to 70:30.

The degree of coloring in the synthetic colored kaolin of the present invention can be controlled by changing the mixing ratio of the above kaolin mineral and potassium silicofluoride. (Temperature conditions) The components of kaolin minerals differ depending on the place of production and the type, and at the same time, the dehydration temperature of the hydroxyl groups differs. In particular, the content of iron oxide that promotes red color development and the content of titanium dioxide and magnesium oxide that inhibit red color development both significantly affect the degree of coloring after firing. Further, the difference in the dehydration temperature has a great influence on the selection of the firing temperature.

That is, in a composition having a high iron oxide content, a reddish color develops by heat treatment (firing).
Conversely, in a composition having a high content of titanium dioxide or magnesium oxide, the color development of the red system by the iron oxide is inhibited, and the red system becomes thinner, and the color becomes closer to gray or white. The heat treatment temperature of the kaolin mineral and the potassium silicofluoride, more specifically, the firing holding temperature during the heat treatment is 400 to 900.
Set to ° C.

When the heat treatment temperature is lower than 400 ° C., there occurs a problem that the intercalation is insufficient and the coloring does not occur. On the other hand, if the heat treatment temperature exceeds 900 ° C., the particles are over-fired and the particles coalesce, so that aggregates are easily generated. As a result, there arises a problem that the feel of the synthetic colored kaolin, the lightness of elongation to the skin, and the slipperiness are reduced. The heat treatment temperature is particularly preferably in the range of 500 to 800 ° C. The heat treatment time, more specifically, the firing holding time during the heat treatment is set to 0.25 to 24 hours.

If the heat treatment time is shorter than 0.25 hours (15 minutes), there occurs a problem that the reaction is insufficient and the coloring does not occur.
On the other hand, even if the heat treatment time exceeds 24 hours, there is no change in coloring, but there is a possibility that some fusion may occur, the production efficiency may decrease, the feel of synthetic colored kaolin, the lightness of elongation to the skin,
It may cause slipperiness to decrease. The heat treatment time is particularly preferably 0.5 to 6 hours in the above range. (Surface Treatment Conditions) In the production of the synthetic colored kaolin according to the present invention, as described above, it is preferred that the mixture of the kaolin mineral and potassium silicofluoride be subjected to a heat treatment and then subjected to a surface treatment.

Specifically, a synthetic colored kaolin produced by heat-treating a kaolin mineral and potassium silicofluoride is dispersed in water (preferably for 24 hours or more in ion-exchanged water) and swelled. , Aluminum sulfate 0.0
0.001 to 40% by weight of iron sulfate and 0.001 to 40% by weight.
It is preferable to stir the mixture by adding it to the sulfuric acid acidic solution added at a ratio of 30% by weight. The synthetic colored kaolin subjected to the surface treatment in this manner has an appropriate cleavage between its layers. As a result, when such a synthetic colored kaolin is used as a cosmetic, the extension to the skin can be made extremely excellent.

The stirring time in the above sulfuric acid solution is 3 minutes to 2 minutes.
Preferably, it is about 4 hours. When the content of aluminum sulfate in the sulfuric acid acidic solution exceeds 40% by weight or the content of iron sulfate exceeds 30% by weight, the synthetic colored kaolin may be discolored. vice versa,
When the content of aluminum sulfate is less than 0.001% by weight or the content of iron sulfate is less than 0.001% by weight, the effect of appropriately cleaving the layers is not exhibited.

In producing the synthetic colored kaolin of the present invention, before the stirring treatment in the sulfuric acid solution,
A crushing treatment by shearing may be performed. The pulverizing treatment by such shearing may be performed using, for example, a raikai device or the like. (Longer diameter, thickness) As described above, the shape of the synthetic colored kaolin of the present invention has an average longer diameter (the longer diameter of the plate) of 0.1 to 10 μm from the viewpoint of touch, slipperiness, elongation and the like. Preferably, and the average thickness is 0.01-0.1μ
m is preferred.

The shape of the synthetic colored kaolin can be appropriately adjusted depending on the particle size of the kaolin mineral or potassium silicofluoride used as a raw material, heat treatment conditions, surface treatment conditions, shear treatment conditions, and the like. (Contents of Iron Oxide, Titanium Oxide, and Magnesium Oxide) The content of iron (III) oxide in the synthetic colored kaolin of the present invention can be determined after the above heat treatment is performed on a mixture of kaolin mineral and potassium silicofluoride (or After the above surface treatment, etc.), in dry synthetic kaolin, 0.50 to 1.10% by weight, preferably 0.5 to 1% by weight.
It is adjusted to be 0.8% by weight.

If the content of iron (III) oxide is less than the above range, the coloring becomes insufficient and the color becomes grayish or almost white. Conversely, if the content of iron (III) oxide exceeds the above range, the layered structure cannot be maintained, and the feel and the slipperiness are reduced, so that the composition is not suitable for cosmetics. In addition, the total content of titanium oxide and magnesium oxide in the synthetic colored kaolin of the present invention is the same as described above, after the above-described heat treatment is performed on the mixture of kaolin mineral and potassium silicofluoride (or as necessary, 0.2% in dry synthetic kaolin (after surface treatment etc.)
It is adjusted to be less than 0% by weight, preferably less than 0.10% by weight.

If the total content of titanium oxide and magnesium oxide exceeds the above range, reddish color development is hindered and almost no color development occurs. The content of iron (III) oxide, titanium oxide and magnesium oxide in the synthetic colored kaolin of the present invention is the content of iron (III) oxide and the like in the raw material kaolin mineral and potassium silicofluoride. Can be appropriately adjusted depending on the mixing ratio, surface treatment conditions, and the like.

[Cosmetic] Next, the cosmetic according to the present invention will be described in detail. The cosmetic of the present invention contains the synthetic colored kaolin of the present invention. The compounding amount of the synthetic colored kaolin in the cosmetic of the present invention is appropriately adjusted according to the tint required for the cosmetic, but is usually adjusted to about 1.0 to 99.0% by weight.

In the cosmetic of the present invention, in addition to the synthetic colored kaolin, other components usually compounded in the cosmetic can be appropriately compounded as long as the effects of the present invention are not impaired. Such other components include, for example, talc, kaolin, sericite, natural mica, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate,
Inorganic powders such as calcium silicate, aluminum silicate, barium silicate, strontium silicate, metal tungstate, silica, hydroxyapatite, barium sulfate, ceramic powder; nylon powder, polyethylene powder, benzoguanamine powder, ethylene tetrafluoride powder , Distyrylbenzene pinhole polymer powder, organic powders such as microcrystalline cellulose; inorganic white pigments such as titanium oxide and zinc oxide; inorganic red pigments such as iron oxide (iron oxide) and iron titanate; γ-iron oxide Inorganic yellow pigments such as iron oxide yellow, loess;
Inorganic black pigments such as black iron oxide and carbon black; inorganic purple pigments such as mango violet and cobalt violet; inorganic green pigments such as chromium oxide, chromium hydroxide and cobalt titanic acid; inorganic blue pigments such as ultramarine and navy blue Pigment; pearl pigments such as titanium oxide-coated mica, titanium oxide-coated bismuth oxychloride, bismuth oxychloride, titanium oxide-coated talc, fish scale foil, colored titanium oxide-coated mica; metal powder pigments such as aluminum powder and copper powder; red 10
No. 4, Yellow No. 4, Yellow No. 5, Green No. 3, Blue No. 1, Blue No. 2, Red No. 202, Red No. 226, Red No. 227, Red No. 230, Orange No. 206, Orange No. 207, Yellow No. 202
No., green No. 201, green No. 204, blue No. 201, green No. 205 and the like; carminic acid, raccaic acid,
Lakes of natural pigments such as calsamine, brasilin and crocin; squalane, liquid paraffin, vaseline, microcrystalline wax, ozokerite, ceresin, myristic acid, palmitic acid, stearic acid,
Oleic isostearic acid, cetyl alcohol, hexadecyl alcohol, oleyl alcohol, cetyl-2-
Ethyl hexanoate, 2-ethylhexyl palmitate, 2-octyldodecyl myristate, 2-octyldodecyl gum ester, neopentyl glycol-2-
Ethyl hexanate, isooctylic acid triglyceride, 2-octyldodecyl oleate, isopropyl myristate, isostearic acid triglyceride, coconut oil fatty acid triglyceride, olive oil, avocado oil,
Various hydrocarbons such as beeswax, myristyl myristate, mink oil and lanolin; oils such as higher fatty acids, fats and oils, esters, higher alcohols and waxes; organic solvents such as acetone, toluene, butyl acetate and ethyl acetate; alkyd resins Resins such as urea resin; plasticizers such as camphor and acetyltributyl citrate; ultraviolet absorbers, antioxidants, preservatives, surfactants, humectants, fragrances, water, alcohols, thickeners and the like.

[0031]

[Production of synthetic colored kaolin]

Examples 1 to 8 X-ray fluorescence analyzer [RIX-210 manufactured by Rigaku Corporation]
0 ”] is 1.19% for Fe ₂ O ₃ , MgO:
0%, TiO ₂ : 0%, average major axis is 1.5 μm,
A ground natural kaolin mineral powder having an average thickness of 0.05 μm and potassium silicofluoride having an average particle size of 1.0 μm were blended at the addition ratio shown in Table 1, and wet-mixed in ethanol for about 3 hours.

Next, the above mixture was pre-dried at 60 ° C., and then dried at 120 ° C. for 12 hours to obtain a raw material powder. Further, the raw material powder was calcined at a temperature of 700 ° C. for 2 hours to obtain a synthetic colored kaolin in the form of plate-like particles and colored in a pale red color. (Shearing treatment and particle size adjustment) The obtained synthetic colored kaolin was pulverized for 10 minutes with a raikai device and classified with a sieve having a mesh size of 45 µm.

(Surface treatment) Next, 20 g of the synthetic colored kaolin that had passed through a sieve having a mesh size of 45 μm was added to deionized water 1
And stirred for 24 hours. Further, the mixture was stirred for 1 hour in a sulfuric acid solution (pH = 2) prepared by adding 0.4 g of aluminum sulfate and 0.1 g of iron sulfate.
After stirring, the mixture was filtered and dried at 120 ° C. to obtain a synthetic colored kaolin.

The color of the synthetic colored kaolin thus obtained,
Table 1 shows the average major axis (μm) and the average thickness (μm). (Measurement of Content of Iron (III) Oxide, Titanium Oxide and Magnesium Oxide) 5 g of the synthetic colored kaolin obtained in each of the above Examples was filled in an aluminum container of 40 mm × 10 mm, and 100 kgf / It was compacted by applying a pressure of cm ² .

The sample thus obtained is subjected to an order analysis (semi-quantitative analysis) by a fundamental parameter (FP) method using a fluorescent X-ray analyzer (the aforementioned “RIX2100”), whereby the sample is analyzed. Iron oxide (III) [Fe ₂ O ₃ ] content (% by weight) of titanium oxide [TiO ₂ ] and magnesium oxide [MgO]
And the total content (% by weight). Table 1 shows the measurement results.
Shown in

[0036]

[Table 1]

[Production of Synthetic Kaolin] Comparative Examples 1 and 2 The values measured by a fluorescent X-ray analyzer (the above-mentioned “RIX-2100”) were Fe ₂ O ₃ : 1.20%, MgO: 0.30.
%, TiO ₂ : 0%, a natural kaolin mineral having an average major axis of 2.5 μm and an average thickness of 0.08 μm, and potassium silicofluoride having an average particle diameter of 1.0 μm at the addition ratio shown in Table 1 above. The mixture was mixed and wet-mixed in ethanol for about 3 hours.

Next, after preliminarily drying the mixture at 60 ° C., the mixture was dried at 120 ° C. for 12 hours to obtain a raw material powder. The raw material powder was fired at a temperature of 700 ° C. for 2 hours. Further, the obtained synthetic kaolin was subjected to shearing treatment, particle size adjustment and surface treatment in the same manner as in Example 1 above. The color, average major axis (μ
m) and the average thickness (μm) are as shown in Table 1 above.

Comparative Examples 3 and 4 The same natural kaolin mineral as used in Example 1 and potassium silicofluoride were blended at the addition ratio shown in Table 1 above, and wet-mixed in ethanol for about 3 hours. next,
After pre-drying the above mixture at 60 ° C.,
Drying was performed for a time to obtain a raw material powder. Further, the raw material powder was calcined at a temperature of 700 ° C. for 2 hours, and the obtained synthetic kaolin was subjected to shear treatment, particle size adjustment and surface treatment in the same manner as in Example 1.

The color, average major axis (μm) and average thickness (μm) of the synthetic kaolin thus obtained are as shown in Table 1 above. [Preparation of Cosmetic] Formulation Example 1 A foundation was prepared using the synthetic colored kaolin obtained in Example 7 according to the formulation shown in Table 2. The method for producing the foundation is as follows.

[0041]

[Table 2]

Of the components shown in Table 2, component A (enhancing pigment) was first converted to perfluoroalkyl phosphate ester salt 3
The treatment was performed using a weight% aqueous solution. Next, component A and component B were mixed, and component C was further added and mixed. The mixture thus obtained was pulverized and stamped on a metal plate using a mold to form a foundation. Formulation Example 2 Using the synthetic kaolin obtained in Example 7 above, a foundation was prepared according to the formulation shown in Table 3.

[0043]

[Table 3]

The inorganic powders shown in Table 3 were all treated with a 3% by weight aqueous solution of perfluoroalkyl phosphate ester salt. Formulation Example 3 Using the synthetic kaolin obtained in Example 7 above, a foundation was prepared according to the formulation shown in Table 4.

[0045]

[Table 4]

The inorganic powders shown in Table 4 were all treated with a 3% by weight aqueous solution of a perfluoroalkyl phosphate ester salt. Formulation Example 4 Commercial red iron oxide [irregular shaped granular iron oxide; particle size 0.03
To 0.05 μm] as a coloring pigment, and a foundation was prepared according to the formulation shown in Table 5. The method of producing the foundation was the same as that of Formulation Example 1 except that the details of the component A (extender) were different.

[0047]

[Table 5]

(Cosmetic Sensory Evaluation) For 30 general women,
The foundations of Formulation Examples 1 and 4 were used, and the texture, lightness of elongation (extensibility), slipperiness,
The uniformity of adhesion and the covering power (hiding power) were evaluated.
The evaluation was performed for each item by the 10-point method, and the average value of the evaluations of 30 persons was used as the evaluation index value. Table 6 shows the results.

[0049]

[Table 6]

When the evaluation index values of all items were 7.5 or more, it was judged that the organoleptic properties as cosmetics were good. As is clear from Table 6, in the foundation of Formulation Example 1, all the evaluation items were 7.5.
The above evaluation was obtained, and it was found that the sensory characteristics were good. In contrast, Formulation Example 4 was superior to Formulation Example 1 in terms of covering power, but was evaluated to be poor in terms of tactile sensation such as light elongation and slipperiness. This is considered to be due to the use of an irregularly shaped color pigment having no plate shape in the foundation of Formulation Example 4.

The foundations of Formulation Examples 2 and 3 also develop a color without hindering the reddish tint.
It was good.

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Claims (5)

[Claims] 1. A synthetic colored kaolin obtained by subjecting a mixture of a kaolin mineral and potassium silicofluoride to a heat treatment, wherein the synthetic colored kaolin contains 0.50 to 1.0.
A synthetic colored kaolin characterized in that it is contained at a ratio of 10% by weight and the total content of titanium oxide and magnesium oxide is less than 0.20% by weight. 2. The synthetic colored kaolin according to claim 1, which is a plate-like particle having an average major axis of 0.1 to 10 μm and an average thickness of 0.01 to 0.1 μm. 3. The method of claim 1, wherein the kaolin mineral and potassium silicofluoride are mixed
A method for producing a synthetic colored kaolin, comprising mixing at a weight ratio of 0:60 to 80:20 and heat-treating the mixture in a closed vessel at 400 to 900 ° C for 0.25 to 24 hours. 4. After the heat treatment, the mixture is further dispersed in water, and then stirred in a sulfuric acid solution containing 0.001 to 40% by weight of aluminum sulfate and 0.001 to 30% by weight of iron sulfate. The method for producing a synthetic colored kaolin according to claim 3, wherein the treatment is performed. 5. A cosmetic comprising the synthetic colored kaolin according to claim 1 or 2.