JP5032092B2 - Cosmetic pencil lead and method for producing the same - Google Patents

Description

  The present invention relates to a cosmetic pencil lead mainly used for cosmetics, for wooden shafts, resin shafts, cigarettes or holders, and a method for producing the same, and more specifically, while having sufficient color developability and line density, The present invention relates to a cosmetic pencil lead that can be freely set to be hard or soft and has excellent mechanical strength (bending strength, tensile strength, impact strength, etc.) and a method for producing the same.

  In the pencil lead for cosmetics, important characteristics generally required are that the coating feeling is good, the color can be increased, the color of the drawn line is good, and the mechanical strength is strong.

  As a cosmetic pencil lead satisfying these characteristics, for example, an ester oil having an intramolecular branched structure composed of silicone oil, a fatty acid and an aliphatic alcohol having a freezing point of 0 ° C. or lower, a methyl hydrogen polysiloxane-treated pigment, and a solid fat are essential components. A cosmetic pencil lead formulated as is known (for example, see Patent Document 1).

  However, the cosmetic pencil lead described in Patent Document 1 contains oil components such as oils and fats and silicone oil, and since these materials strongly influence the strength, powdery (like powdered hardened powder) There is a problem in that the strength decreases when the coating feeling is soft and the coating feeling is soft.

  On the other hand, a pencil lead for makeup aiming at a powdery coating feeling without using waxes has been studied. As such a cosmetic pencil lead, for example, a binder using a water-soluble paste such as CMC (carboxymethyl cellulose) (for example, see Patent Document 2) or a plaster (for example, patent) Document 3) is known.

  However, in the cosmetic pencil lead using a binding material such as CMC and gypsum in Patent Documents 2 and 3, the binding material is extremely hardened, so that the feeling of application to the skin is very hard, and eyebrow and eye If it is made thin, such as a liner, it is very fragile, and if the amount of the binder is increased to obtain sufficient mechanical strength, it cannot be applied to the skin at all. That is, a cosmetic pencil lead using a water-soluble paste such as CMC or gypsum instead of waxes as a binder to obtain a powdery feeling of use satisfies both sufficient mechanical strength and good coating feeling at the same time. There is a problem in that it is difficult.

  Furthermore, a pencil lead for makeup that satisfies both sufficient mechanical strength and good coating feeling without using waxes has been studied. For example, clay is used as a binder and the clay is sintered ( For example, the patent document 4) and the thing which made the pore formation material into the more porous sintered compact (for example, refer patent document 5) are known.

  However, in the cosmetic pencil lead described in Patent Document 4, an inorganic pigment dispersed and contained in a powder form is contained in a clay sintered body that forms a porous skeleton by sintering. A porous pencil lead for cosmetics, which means that “the higher the porosity, the better the touch and applicability during use, and the smaller the porosity, the higher the strength. In the end, Patent Document 4 discloses a sintered body having a porosity of about 50% to 90%. In other words, a clay sintered body can provide sufficient mechanical strength, but it is hard and difficult to apply to the skin. By making a porous sintered body, sufficient mechanical strength and good application can be obtained. This means that a cosmetic pencil lead satisfying the feeling can be obtained at the same time.

  Generally, in order to satisfy a good coating feeling and a sufficient mechanical strength at the same time, as described in Patent Documents 4 and 5, it is essential to adjust the porosity. As described in Patent Document 4, it is possible to obtain a sintered body having a preferable porosity of about 50 to 90% only by changing the temperature at the time of sintering treatment or the use ratio of clay and powdered pigment. It is very difficult, and as described in Patent Document 5, it is very difficult to obtain a sintered body having a porosity within a preferable range only by using a pore forming material. Currently.

  Furthermore, in order to satisfy a good coating feeling and a sufficient mechanical strength at the same time, for example, 1 to 10 weights of at least one selected from the group consisting of bentonite, smectite, montmorillonite, beidellite, nontrite, hectorite and saponite. %, An inorganic extender pigment and an inorganic coloring pigment as essential components, and a molding composition comprising inorganic powder and water obtained by sintering these in a temperature range of 300 ° C. to 1,000 ° C. A cosmetic pencil lead (see, for example, Patent Document 6) is known which is heat-treated at 300 to 1,000 ° C. after drying.

However, similar to the above, since clay is sintered to form a binder, there is a problem in that the strength is weakened when blended into a soft coating feeling.
Also, when clay is baked in this way to form a binder, organic pigments and dyes change color, so only highly heat-resistant pigments such as inorganic pigments can be used. It is difficult to get sex.

On the other hand, a colored pencil lead that can synthesize a silicon oxide skeleton at a low temperature by using a method for producing a colored pencil lead using polysiloxane is known (for example, see Patent Document 7 by the applicant of the present application). The technical idea (purpose, configuration and operational effect) is different.
Japanese Patent Publication No. 62-169714 (claims, examples, etc.) JP 59-44305 A (Claims, Examples, etc.) JP 59-93014 A (Claims, Examples, etc.) JP 61-176513 (Claims, Examples, etc.) Japanese Patent Laid-Open No. 61-197507 (Claims, Examples, etc.) JP-A-8-188518 (Claims, Examples, etc.) JP2003-261812 (Claims, Examples, etc.)

  The present invention is to further improve the prior art of the inventors in view of the problems of the prior art described above, the coating feeling is soft and good, and the mechanical strength is maintained, vivid color developability and density An object of the present invention is to provide a multi-color cosmetic pencil lead having

  As a result of intensive studies to solve the above-described conventional problems, the present inventors have formed a porous body of silicon oxide as a skeleton at least on the surface and interface of the powder constituting the core body. The present inventors have found that the problem can be solved by containing sericite whose average particle diameter is adjusted to a specific range as an extender, and has completed the present invention.

That is, the present invention resides in the following (1) to (6).
(1) and the skeleton of the porous body made of silicon oxide, and characterized by including those in which at least an average particle diameter contains a constitutional material of sericite which has been adjusted to 3.5～10Myuemu, it is attached Make up pencil lead for makeup.
(2) The cosmetic pencil lead according to the above (1), which further contains boron nitride in a weight ratio of 1: 0.28 to 4.0 and is bonded to the sericite.
(3) The cosmetic pencil lead as described in (2) above, wherein the boron nitride has an average particle size of 4.5 to 7.5 μm.
(4) total content of the boron nitride and the sericite, based on the total amount of the cosmetic pencil lead, the above (2) or (3), characterized in that it is contained 15 to 25 wt% The pencil lead for makeup as described .
(5) the cosmetic pencil lead according to any one of the pores of the porous body made of silicon oxide is characterized by a range of diameter 2 to 1000 nm (1) ~ (4).
(6) Structure of sericite in which polysiloxane having a structural unit represented by the following general formula (I) is adjusted to an average particle size of 3.5 to 10 μm in order to synthesize a silicon oxide porous body as a skeleton It is made to exist in the compounding composition containing at least a material and a coloring material, and is subjected to a heat treatment by microwaves, so that a porous body made of silicon oxide is used as a skeleton, and at least an average particle size is adjusted to 3.5 to 10 μm. A method for producing a cosmetic pencil lead, comprising: a sericite extender, and a cosmetic pencil lead comprising these bonded materials at a low temperature.

According to the present invention, comprise a skeleton of the porous body made of silicon oxide, those at least an average particle diameter contains a constitutional material of sericite which has been adjusted to 3.5～10Myuemu, it is attached Thus, a cosmetic pencil lead is provided which has a sufficient color developability and a drawn line density, a good coating feeling and excellent mechanical strength (bending strength, tensile strength, impact strength, etc.).
Further, Rutotomoni a porous body made of silicon oxide as a skeleton, since at least the average particle diameter is used extender material sericite being adjusted to 3.5～10Myuemu, good coating feeling powdery give In addition, since it can be produced at a low temperature by manufacturing using microwaves, various pigments can be used without causing deterioration due to heat treatment, and color development is less likely to be impaired. A cosmetic pencil lead is obtained.

  Hereinafter, although embodiment of this invention is described, this invention is not limited to the following embodiment.

Cosmetic pencil lead of the present invention, a porous body made of silicon oxide (hereinafter, simply "oxide porous silicon" hereinafter) and skeleton of at least an average particle diameter of sericite which is adjusted to 3.5~10μm And a combination of these , and as a method for producing a cosmetic pencil lead of the present invention, for example, a silicon oxide porous body is synthesized as a skeleton. Therefore, a polysiloxane having a structural unit represented by the following general formula (I) is contained in a composition containing at least a sericite extender and a colorant whose average particle size is adjusted to 3.5 to 10 μm. is present, by performing heat treatment by microwaves, contains a skeleton of a porous body made of silicon oxide, and a constitution material of sericite at least average particle diameter is adjusted to 3.5～10Myuemu, this Ru der which is characterized in that to produce a cosmetic pencil lead including those et bound at low temperatures.

  As described above, the cosmetic pencil lead of the present invention contains sericite having a porous structure of silicon oxide as a skeleton (binding material) and an average particle size of 3.5 to 10 μm as a constitutional material. In order to constitute the silicon oxide porous body as a skeleton, for example, a polysiloxane having a structural unit represented by the above general formula (I) is present in a blend composition containing at least a body material and a colorant, It can be formed by performing heat treatment such as microwave heat treatment.

  First, in the present invention, the structure of the porous silicon oxide to be used is not particularly limited as long as it is used as a binder for bonding powders together. Crystal structures and various cell structures can be used. Usually, these are used alone, but two or more kinds can be mixed and used, and are appropriately selected depending on the properties and strength of the target cosmetic pencil lead.

  The sericite used in the present invention is contained as an extender in order to impart a good coating feeling and mechanical strength, and its structure is not particularly limited. For example, natural products, synthetic products, etc. Depending on the production method and the production area, those having slightly different constituents or those of various polytypes can be used. Usually, these are used alone, but two or more kinds can be mixed and used, and are appropriately selected depending on the properties and strength of the target cosmetic pencil lead.

The sericite to be used needs to have an average particle size of 3.5 to 10 μm, preferably 6.5 to 8.5 μm, in view of the structural balance with the silicon oxide porous skeleton. It is desirable to use
When the average particle size of the sericite is less than 3.5 μm, the powdery coating feeling is lost and hardened, while when it exceeds 10 μm, the mechanical strength is lost, which is not preferable. In addition, the sericite of the average particle diameter which becomes the said range can be adjusted suitably by grind | pulverizing.

In the present invention, the porous silicon oxide used is preferably formed as a skeleton by subjecting the polysiloxane represented by the general formula (I) to a specific heat curing treatment.
The polysiloxane represented by the general formula (I) used in the present invention is determined in a form suitable for a general polymerization method such as a sol-gel method using a silicon organic compound or a silicon inorganic compound as a starting material, Of these, tetraethoxysilane is particularly preferable because it is inexpensive and easy to handle.
Further, the degree of polymerization of the polysiloxane used in the present invention is sufficient if it is 2 or more, and there is no particular upper limit of the degree of polymerization, and it is determined in a timely manner from the ease of the polymerization reaction and the handling of the polysiloxane.
Furthermore, the polysiloxane represented by the above general formula (I) is sufficiently blended with an extender and the like, diluted with ethanol or the like for the purpose of improving characteristics at the time of kneading and molding, and adjusted with a diluted hydrochloric acid solution or the like. It is preferably used in the form of a siloxane solution.

  The blending amount of this polysiloxane is preferably 2 to 50% by weight, more preferably 3 to 30% by weight, based on the total amount of the blending composition. When the blending amount of the polysiloxane is less than 2% by weight, the core becomes weak due to insufficient strength. On the other hand, when it exceeds 50% by weight, the coloring power is low and the core having a hard coating feeling is not preferable.

In the present invention, a constitution material other than sericite can also be used, and the other constitution material is not particularly limited as long as it is conventionally used for a cosmetic pencil lead, and any constitution material can be used. It is. In addition to sericite, white based materials such as boron nitride, kaolin (kaolinite), talc, mica, calcium carbonate, and other colored materials can be used depending on the hue of the pencil lead for makeup. Several of these mixtures can also be used. Preferably, boron nitride and kaolin are mentioned from the physical property and shape.
The content of sericite to be used is preferably 3 to 20% by weight with respect to the total amount of the blended composition in order to impart a good coating feeling and mechanical strength. In addition, it is preferable that the total content of the extender containing sericite is 15 to 85% by weight with respect to the total amount of the blended composition.

In the present invention, the feeling of application is better, and from the viewpoint of further improving mechanical strength, it is particularly preferable to contain boron nitride as a constitution material other than sericite, and the content when boron nitride is used in combination is It is desirable to contain boron nitride in a weight ratio of 0.28 to 4.0 with respect to the sericite 1.
The average particle diameter of boron nitride to be used is preferably 4.5 to 7.5 μm in view of the structural balance with the silicon oxide porous body skeleton and sericite.
Further, the total content of boron nitride and sericite to be used is desirably 15 to 25% by weight based on the total amount of the blended composition from the viewpoint of further improving the coating feeling and mechanical strength. .

As the coloring material used in the present invention, any of various known dyes, inorganic pigments, organic pigments and the like used in conventional cosmetic pencil cores can be used, and naturally these several kinds of mixtures can also be used. Particularly preferred are iron oxides (black, red, yellow), bitumen, and titanium oxide because of their physical properties and shape.
The blending amount of these colorants is preferably 10 to 75% by weight, more preferably 30 to 55% by weight, based on the total amount of the blending composition.

As a method for producing a cosmetic pencil lead of the present invention, for example, in order to synthesize a silicon oxide porous body as a skeleton, a polysiloxane having a structural unit represented by the above general formula (I) is used as a constitution material and a coloring material. By presenting at least in the compounding composition to be contained, kneading the compounding composition, extruding the kneaded material into a thin line with an extruder, drying, and then subjecting to heat treatment such as heat treatment using microwaves. A cosmetic pencil lead having a silicon oxide porous body as a skeleton can be produced at a low temperature.
The conditions (frequency, irradiation time, etc.) of the heat treatment with microwaves vary depending on the use, shape, raw material type, etc. of the cosmetic pencil lead, but if it is a cosmetic pencil lead having a diameter of about 4 mm, 900 to 3000 MHz, 100 g. In the case of about a sample, it is about 1 to 60 minutes at 100 W.
As a treatment method other than the heat treatment by microwave, heat treatment can be performed at 450 to 700 ° C. for 1 to 48 hours in an inert gas atmosphere such as nitrogen gas.

In the present invention, as described above, a ceramic made of a silicon oxide porous body is used as a skeleton, and sericite is used as a build material, so that a good coating feeling can be obtained in a powdery manner, and in particular, a microwave heat treatment is used. As a result, it is possible to produce a cosmetic pencil lead by synthesis at a low temperature (100 ° C. or less), so various pigments including pigments with low heat resistance are used without causing deterioration due to heat treatment. Thus, a cosmetic pencil lead having a sufficient number of colors and vivid color developability that is less likely to impair color development is produced.
The pores of the silicon oxide porous body (skeleton) of the resulting cosmetic pencil lead are soft and good in coating feeling, and obtain a cosmetic pencil lead having vivid color developability and concentration while maintaining mechanical strength. Therefore, it is desirable that the diameter is in the range of 2 nm to 1000 nm, preferably 10 to 200 nm. The pore size of the silicon oxide porous body (skeleton) can be adjusted by suitably combining the selection of the average particle size of the raw materials to be used (sericite, boron nitride, etc.) and the conditions of the heat treatment. The measurement of the pores (including examples described later) can be performed with a mercury intrusion type pore distribution measuring device (manufactured by Yuasa Ionic Co., Ltd.).

In the present invention configured as described above, after forming the raw material, the porous silicon oxide body serving as a binder is used as a skeleton, and sericite having an average particle diameter within a specific range is contained as the extender. Therefore, while having sufficient color developability and drawing density, the coating feeling can be freely set to be hard or soft by selecting the size and distribution of pores of the silicon oxide porous body, or the material type and the average particle size of sericite, A cosmetic pencil lead that is excellent in mechanical strength (bending strength, tensile strength, impact strength, etc.) and can be multicolored and a method for producing the same are obtained.
The resulting cosmetic pencil lead can be suitably applied to a cosmetic pencil using a feeding container, a wooden shaft, a paper roll, a resin shaft, and a holder as a shaft.

  The makeup pencil lead of the present invention configured as described above is not limited to the above embodiment, and can be implemented with various modifications within the scope of the technical idea of the present invention.

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited to the following Example at all.

Example 1
After diluting 50 g of tetraethoxysilane with 50 g of ethanol and mixing for 1 hour, 100 g of 0.01N-HCl aqueous solution was added dropwise and mixed for 6 hours to obtain Solution A.
Formulation composition:
Solution A 30.0% by weight
Black iron oxide 20.0% by weight
17.5% by weight
Sericite (average particle size 6.5 μm) 27.5% by weight
Kaolinite (average particle size 4.8 μm) 15.0% by weight
The above blended composition is kneaded, extruded into a thin line with an extruder, dried in air at 80 ° C. for 24 hours, washed with IPA (isopropyl alcohol), and heated with microwave (2.45 GHz, 700 W). Was performed for 3 minutes to obtain a brown cosmetic pencil lead having a diameter of 4.0 mm.

(Example 2)
After diluting 50 g of tetraethoxysilane with 50 g of ethanol and mixing for 1 hour, 80 g of 0.01N-HCl aqueous solution was dropped and mixed for 6 hours to obtain Solution B.
Formulation composition:
Solution B 30.0% by weight
Black iron oxide 20.0% by weight
Petal 10.0% by weight
Sericite (average particle size 6.5 μm) 10.0% by weight
Boron nitride (average particle size 4.5 μm) 6.0% by weight
Kaolinite (average particle size 4.8 μm) 24.0% by weight
The above blended composition is kneaded, extruded into a thin line with an extruder, dried in air at 80 ° C. for 24 hours, the core washed with IPA, and microwave heating (2.45 GHz · 700 W) performed for 3 minutes. A brown cosmetic pencil lead with a diameter of 4.0 mm was obtained.

(Example 3)
50 g of a mixture of ethyl polysilicate and tetraethoxysilane (ethyl silicate 40: manufactured by Colcoat Co., Ltd.) is diluted with 50 g of ethanol, and 100 g of 0.01N-citric acid aqueous solution is added dropwise and mixed for 6 hours to obtain solution C. Composition:
Black iron oxide 20.0% by weight
9.5% by weight
Sericite (average particle size 6.5 μm) 10.5% by weight
Boron nitride (average particle size 4.5 μm) 5.0% by weight
Kaolinite (average particle size 4.8 μm) 35.0% by weight
Solution C 20.0% by weight
The above blended composition was kneaded, extruded into a thin line with an extruder, dried at 700 ° C. in nitrogen for 24 hours, impregnated with solution C, and subjected to microwave heating (2.45 GHz · 700 W) for 3 minutes. A brown cosmetic pencil lead with a diameter of 4.0 mm was obtained.

Example 4
40 g of a mixture of ethyl polysilicate and tetraethoxysilane (ethyl silicate 40: manufactured by Colcoat Co., Ltd.) was diluted with 60 g of ethanol, 100 g of 0.01N-citric acid aqueous solution was added dropwise and mixed for 6 hours to obtain Solution C. .
Formulation composition:
Titanium dioxide-coated mica (average particle size 22.5 μm) 50.0% by weight
Sericite (average particle size 6.5 μm) 10.0% by weight
Boron nitride (average particle size 4.5 μm) 5.0% by weight
Kaolinite (average particle size 4.8 μm) 15.0% by weight
Solution C 20.0% by weight
The above blended composition was kneaded, extruded into a thin line with an extruder, and dried in nitrogen at 700 ° C. for 24 hours to obtain a white eyeshadow pencil lead having a diameter of 7.0 mm.

(Comparative Example 1)
Formulation composition:
Solution A 30.0% by weight
Black iron oxide 20.0% by weight
Petal 10.0% by weight
Boron nitride (average particle size 4.5 μm) 10.0% by weight
Kaolinite (average particle size 4.8 μm) 30.0% by weight
The above blended composition is kneaded, extruded into a thin line with an extruder, dried in air at 80 ° C. for 24 hours, core impurities are Soxhlet extracted, and microwave heating (2.45 GHz · 700 W) is applied for 3 minutes. A brown cosmetic pencil lead having a diameter of 4.0 mm was obtained.

(Comparative Example 2)
Formulation composition:
Solution B 30.0% by weight
Black iron oxide 20.0% by weight
Petal 10.0% by weight
Boron nitride (average particle size 4.5 μm) 22.0% by weight
Kaolinite (average particle size 4.8 μm) 18.0% by weight
The above blended composition is kneaded, extruded into a thin line with an extruder, dried in air at 80 ° C. for 24 hours, the core washed with IPA, and microwave heating (2.45 GHz · 700 W) performed for 3 minutes. A brown cosmetic pencil lead with a diameter of 4.0 mm was obtained.

(Comparative Example 3)
Formulation composition:
Black iron oxide 20.0% by weight
Petal 5.0% by weight
Sericite (average particle size 6.5 μm) 15.0% by weight
Boron nitride (average particle size 4.5 μm) 5.0% by weight
Kaolinite (average particle size 4.8 μm) 30.0% by weight
Bentonite (average particle size 4.5 μm) 5.0% by weight
Distilled water 20.0% by weight
The above blended composition is kneaded with two rolls and further dispersed with three rolls, and then the kneaded product is extruded into a thin wire shape with a screw type extruder, heated to 700 ° C. in a nitrogen atmosphere and heated to 5 ° C. By baking for a while, a brown cosmetic pencil lead having a diameter of 4.0 mm was obtained.

(Comparative Example 4)
Formulation composition:
Titanium dioxide-coated mica (average particle size 22.5 μm) 50.0% by weight
Boron nitride (average particle size 4.5 μm) 5.0% by weight
Kaolinite (average particle size 4.8 μm) 20.0% by weight
Solution C 20.0% by weight
The above blended composition was kneaded, extruded into a thin line with an extruder, and dried in nitrogen at 700 ° C. for 24 hours to obtain an eye shadow pencil lead having a diameter of 7.0 mm.

Each evaluation of the moldability of each cosmetic pencil core obtained in Examples 1 to 4 and Comparative Examples 1 to 4, mechanical strength, color developability (appearance and line drawing color), and coating feeling by sensory evaluation was performed. .
The mechanical strength is expressed as a ratio with 20 breaks (7N) of Comparative Example 1 taken as 100, with a three-point bending strength test conducted under the conditions of 20 mm between fulcrums and a speed of 5 mm / min. Evaluation of color developability and coating feeling was performed in the form of a pencil assembled on a wooden shaft.
These results are shown in Table 1 below.

(Consideration of Table 1)
The cosmetic pencil lead suitable for the eyebrow of Examples 1 to 3 and the eye shadow pencil lead of Example 4 that are within the scope of the present invention are easily worn and have a smooth coating feeling and at the same time. It was found that the color development was good and the mechanical strength was strong. Moreover, when the hole of the silicon oxide porous body (skeleton) was measured in the cosmetic pencil lead of Examples 1 to 4, all had a diameter in the range of 2 nm to 1000 nm. Further, even when the cosmetic pencil lead of Examples 1 to 4 was impregnated with oil, a good coating feeling was obtained.
On the other hand, Comparative Example 1 outside the scope of the present invention does not use sericite, but instead uses boron nitride, so that a large amount of kaolin is blended in order to compensate for poor moldability. It has come out strongly.
Moreover, when it was comprised only with boron nitride as shown to the comparative examples 2 and 4, the coating feeling which became null null appeared and as a result, the smooth coating feeling was lost. Moreover, when the amount of boron nitride increases, the mechanical strength tends to be weakened.
Furthermore, as shown in Comparative Example 3, when the skeleton is a substance other than the silicon oxide porous body, the balance between strength and coating feeling is poor, and the superiority of Example 3 is clear when compared with Example 3.

Claims (6)

Cosmetic to the skeleton of the porous body made of silicon oxide, characterized in that it includes those in which at least an average particle diameter contains a constitutional material of sericite which has been adjusted to 3.5～10Myuemu, they are attached Pencil lead. The cosmetic pencil lead according to claim 1, further comprising boron nitride in a weight ratio of 1: 0.28 to 4.0 and bonded to the sericite. 3. The cosmetic pencil lead according to claim 2, wherein the boron nitride has an average particle size of 4.5 to 7.5 [mu] m. The total content of the sericite and the boron nitride, cosmetic pencil lead according to claim 2 or 3 with respect to the total amount of the cosmetic pencil leads, characterized in that it is contained 15 to 25 wt% . Cosmetic pencil lead according to any one of claims 1 to 4 pores of the porous body consisting of the silicon oxide is characterized by a range of diameters 2 to 1000 nm. In order to synthesize a silicon oxide porous body as a skeleton, a polysiloxane having a structural unit represented by the following general formula (I) and a coloring material of sericite whose average particle diameter is adjusted to 3.5 to 10 μm and coloring be present in the blend composition containing at least wood, by applying a heat treatment by microwaves, a porous body made of silicon oxide as a skeleton, at least the average particle size is adjusted to 3.5~10μm A method for producing a cosmetic pencil lead, comprising a sericite extender, and a cosmetic pencil lead comprising those bound together .