JPH069898A - Modified powder and cosmetic containing the same blended therein - Google Patents

Abstract

PURPOSE:To obtain modified powder excellent in water repellency, blocking ability of catalytic activity, quality stability and touch with hardly any secondary aggregation by mixing powders with a specific methylhydrogenpolysiloxane and then heat-treating the resultant mixture under specific conditions. CONSTITUTION:The modified powder is obtained by mixing (A) 100 pts.wt. powders such as fine particulate titanium oxide, fine particulate zinc oxide, fine particulate iron oxide or fine particulate titanium suboxide having 5-50nm primary particle diameter with (B) preferably 1-15 pts.wt. compound expressed by the formula (k is an average number and 7-30) and then heat-treating the resultant mixture at 80-200 deg.C for 0.5-5hr. Furthermore, the objective cosmetic is prepared by blending this modified powder therein.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a modified powder obtained by mixing powders with methylhydrogenpolysiloxane having a specific average degree of polymerization and then subjecting the mixture to heat treatment, and a cosmetic containing the powder. Regarding More specifically, the present invention relates to a cosmetic material containing a modified powder that has little secondary aggregation, and is excellent in water repellency and catalytic activity blocking ability.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
When the powders are coated with methylhydrogenpolysiloxane, the structures of methylhydrogenpolysiloxane used are those having the structures shown in Chemical formulas 3 and 4. After methylhydrogenpolysiloxane is coated on the pigment surface, by heat treatment, occur _{2Si-H + 1 / 2O 2} = Si-O-Si + H 2 reaction such as polymerization in the pigment surface, a film Form.

[0003]

[Chemical 3] (However, a = 30 to 50)

[0004]

[Chemical 4] (However, m = n, m + n = 30 to 50)

In the conventional methyl hydrogen polysiloxane, in order to sufficiently carry out this polymerization reaction, 170
It was necessary to react at high temperature for a long time, such as heating at ℃ for 5 hours. However, depending on the pigment, quality deterioration such as deterioration and discoloration occurs under these heating conditions, so that it is necessary to lower the reaction temperature and there is a problem that the polymerization reaction becomes incomplete.

Then, the inventors analyzed the factors affecting the polymerization of methylhydrogenpolysiloxane, and found that
It was found that the main factors were 1) reaction conditions (reaction temperature, time), 2) average degree of polymerization and structure of methylhydrogenpolysiloxane, and 3) catalytic activity of the pigment itself.

As a result of intensive studies on the relationship between the average degree of polymerization and structure of the methylhydrogenpolysiloxane of 2) and the reaction conditions of 1), the one having the structure shown in Chemical formula 5 has the best reactivity. I found that.

[0008]

[Chemical 5] (However, k is an average number, and k = 7 to 30)

Here, JP-A-59-76009 describes the use of methylhydrogenpolysiloxane having a degree of polymerization of 40 or less, and JP-A-59-14.
Although Japanese Patent No. 4709 describes the use of methylhydrogenpolysiloxane having a degree of polymerization of 3 to 500, there is no description about the properties recognized in the present invention, and only a general expression is given.

Further, by coating a fine particle powder such as fine particle titanium oxide having a characteristic of easily aggregating with a methylhydrogenpolysiloxane specified in the present invention by a dry method without using a solvent, We succeeded in reforming under lower reaction conditions while minimizing the agglomeration of the powder.

The modified fine particle powder thus obtained has the same UV protection ability as that of the untreated powder, and no increase in hiding power or decrease in UV protection ability due to aggregation of the powder is observed. When blended in cosmetics, it has the same UV protection performance and tint as untreated powder. In the conventional wet treatment and air blender treatment, granulation of fine particle powder occurs, so that the ultraviolet protection performance is decreased and the hiding power is increased as compared with the untreated powder.

That is, the object of the present invention is to obtain a modified powder having less secondary agglomeration and excellent water repellency under milder reaction conditions. By blending this modified powder, stable quality is obtained. To provide cosmetics having excellent properties.

[0013]

According to the present invention, a modified powder which is surface-treated under the specific heating conditions described below after mixing powders with the specific compound described below and the modified powder are blended. Regarding cosmetics

The details of the configuration of the present invention will be described below. The powders used in the present invention include, for example, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, carbon black,
Color pigments such as ultramarine blue, white pigments such as zinc oxide, titanium oxide, cerium oxide and zirconium oxide, talc, mica,
Extender pigments such as sericite, kaolin, mica, montmorillonite, pearl pigments such as titanium mica, barium sulfate, calcium carbonate, magnesium carbonate, aluminum silicate,
Metal salts such as magnesium silicate, organic-coated pigments such as mica coated with N-acyl aspartic acid and pigments treated with metallic soap, nylon powder, silk powder, urethane powder, Teflon powder, cellulose powder, silicone powder, gold-dyed silk powder, polyethylene powder And the like, inorganic powders such as silica and alumina, dyes such as Blue No. 404, lake pigments such as Red No. 2 Al lake, bentonite, and amino acid-based organic pigments. In particular, fine particle powders such as fine particle titanium oxide, fine particle zinc oxide, fine particle iron oxide, fine particle lower order titanium oxide, alumina-coated fine particle titanium oxide, and silica-coated fine particle titanium oxide are preferable. Examples of the fine particle titanium oxide include those having a primary particle diameter of 5 to 50 nm and a crystal form of rutile type, anatase type, or amorphous type.
The amorphous type may or may not be subjected to treatments such as removal of impurities and reduction of catalytic activity.

The methylhydrogenpolysiloxane used in the present invention can be used alone or in combination of two or more selected from those having a structure represented by the following general chemical formula.

[0016]

[Chemical 6] (However, k is an average number, and k = 7 to 30)

Hereinafter, the methylhydrogenpolysiloxane having this structure will be referred to as an MHPS treating agent.

In the present invention, the ratio of coating the powder with the MHPS treating agent is 100 parts by weight of the powder with respect to MHP.
The S treating agent is 0.5 to 25 parts by weight, and more preferably the MHPS treating agent is 1 to 15 parts by weight.

The conditions for heating the mixture of powders and MHPS treating agent are as follows: heat treatment at 80 to 200 ° C. for 0.5 to 5 hours, or primary heat treatment at 60 to 120 ° C. A method may be mentioned in which it is carried out for 0.5 to 4 hours, and subsequently, the secondary heat treatment is carried out at a temperature higher than that of the primary heat treatment and at 80 to 200 ° C. for 0.2 to 3 hours.

The coating method of the MHPS treating agent used in the present invention is as follows: A method of stirring and mixing powders and an MHPS treating agent without using a solvent. 2. A method in which an MHPS treating agent dissolved in a small amount of solvent is stirred and mixed with powders. 3. A method in which a slurry of a powder obtained by dissolving an MHPS treating agent in a large amount of solvent is formed, and then the solvent is distilled off. 4. A method of coating powders with an MHPS treatment agent using a spray dryer or an air blender. Etc. However, it should be noted that if a solvent is used in the step of coating the powder with the MHPS treating agent, aggregation often occurs.

Further, when the MHPS treating agent is added, it is preferable to make the droplets of the MHPS treating agent as small as possible by using an air brush or the like. Further, when handling fine particle powder, agglomeration is likely to occur. Therefore, plate-like powder such as sericite or talc should be mixed at a ratio of 10 to 60 parts of plate-like powder to 100 parts by weight of fine particle powder. When used, it is effective in preventing aggregation.

Examples of the cosmetics of the present invention include white powder, foundation, pressed powder, water-based foundation, oil-based foundation, emulsified foundation,
Lipstick, blusher, eye shadow, eyebrow, eyeliner, mascara, nail color, cheek color, base foundation, sunscreen agent, emulsion, lotion and the like can be mentioned.

As the cosmetics, as long as the object of the present invention is achieved, oils, powders, etc. which are usually used in cosmetics,
Solvents, surfactants, ultraviolet absorbers, preservatives, bactericides, preservatives, antioxidants, hormones, vitamins, moisturizers, fragrances and the like can be added at the same time.

Examples of the oil agent in this case include higher fatty acids, higher alcohols, synthetic esters, waxes, vegetable fats and oils, animal fats and oils, hydrocarbons, fluorocarbons, perfluoropolyethers, fluoroalkoxyphosphazenes and the like. Examples of the silicone oil include dimethylpolysiloxane, methylphenylpolysiloxane, polyether-modified silicone, fluorine-modified silicone, methylcetyl-modified silicone, amino-modified silicone and cyclic dimethylpolysiloxane. Examples of the powders include powders, resins, fibers and the like which are usually used in cosmetics. These powders may or may not be subjected to surface treatment such as coupling agent treatment, silicone treatment, fluorine treatment, metal soap treatment, silica treatment, alumina treatment, amino acid treatment, metal coating treatment and plasma treatment. . As the solvent, cyclic silicone and the like can be used in addition to the solvents such as water, alcohol and propylene glycol which are usually used in cosmetics. Examples of the surfactant include anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants and the like.

[0025]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples. The method for evaluating the polymerizability of the methylhydrogenpolysiloxane used in the examples is as follows.

1. Method for Evaluating Polymerizability of Methyl Hydrogen Polysiloxane 7 g of methyl hydrogen polysiloxane having each average degree of polymerization was put in a glass petri dish having a diameter of 9 cm.
The film is placed in a blast dryer set at 0 to 180 ° C. for 1 to 8 hours, and the state of the formed film is observed. Then, the minimum heating condition for forming a film was examined. The results are shown in Table 5.

Since the present test method does not consider the catalytic activity of the powder, the heating conditions when the powder is actually coated with methylhydrogenpolysiloxane and heated are as follows:
It should be noted that it is often looser than the minimum heating conditions obtained in this test.

The evaluation methods for secondary aggregation, water repellency and blocked state of catalytic activity described in the examples are as follows.

2. Evaluation method of secondary aggregation of powders 2-1 Evaluation method for powders having an average particle size of 0.1 μm or more Particle size distribution meter (PRO-7000, PRO-9000
Using Seishin Enterprise Co., Ltd., ethanol was used as a dispersion solvent, and the volume average particle diameter of the powders in an ultrasonically dispersed state was measured. The average particle diameter of the powders in the untreated state is D, the average particle diameter of the treated powder is D1, and the result of evaluation based on the criteria shown in Table 1 by the cube value of (D1 / D) Is shown in Table 13.

[0030]

[Table 1]

2-2 Evaluation method for powders having an average particle size of 0.1 μm or less To 50 g of dimethylpolysiloxane (30000 cs), 150 mg of fine particle powder was added and well stirred,
Dispersion was performed using a roller. The thickness of this sample was set to 40 μm, and the spectral distribution at a wavelength of 700 to 190 nm was measured using a spectrophotometer (MPS-2000 type manufactured by Shimadzu Corporation). 300n of untreated fine powder
When the transmittance (%) at m is A and the transmittance (%) at 300 nm of the treated powder is B, the value of B-A is C.
And the value of C was evaluated based on the criteria shown in Table 2. The results are shown in Table 12.

[0032]

[Table 2]

3. Evaluation method of water repellency After weighing 30 mg of the treated powder and placing it in a test tube containing 10 mL of an aqueous ethanol solution prepared to have a concentration of 0 to 100 vol%, an ultrasonic cleaner (BRANSON2200) was used.
Type BRANSON CLEANING EQUIPM
Ultrasonic waves were radiated for 1 minute using ENT COMPANY. After ultrasonic irradiation, the concentration of ethanol at which the treated powder started to disperse in the aqueous ethanol solution was measured. Table 12 and Table 13 show the results of evaluation based on the criteria shown in Table 3, where E is the concentration of ethanol at which dispersion starts. Incidentally, E
The higher the value of, the better the water repellency.

[0034]

[Table 3]

4. Evaluation method of catalytic activity blocking state It is known that fine particle powder having a primary particle diameter of 0.1 μm or less has a strong catalytic activity. In particular, titanium oxide has a strong photocatalytic activity even though it has an anatase-type or amorphous-type structure, and causes discoloration of titanium oxide due to the transition to low-order titanium oxide and deterioration of perfume in cosmetics. In this evaluation method, the blocked state of catalytic activity was tested from the discolored state of titanium oxide when exposed to light in the presence of water. Sample 0.03
After being dispersed in 1 g of ethanol, 10 g of glycerin was added, stirred and transferred to a synthetic quartz cell. Then wavelength 25
A 4 nm black light (4 W tube) was used to measure the discoloration of the solution when irradiated with ultraviolet rays from a distance of 1 cm for 30 minutes. Table 12 shows the results of evaluation based on the criteria shown in Table 4. It should be noted that the more the discoloration occurs, the worse the blocked state of the catalytic activity is.

[0036]

[Table 4]

The evaluation method of the feel of the cosmetics described in the examples is as follows. 5. Evaluation Method of Feeling of Cosmetics Using the cosmetics prepared in Examples and Comparative Examples of each cosmetic, the feeling was evaluated for a total of 10 men and women aged 22 to 36. The results are shown in Table 14. In Table 14, the numerical values show how many people out of 10 judged for each evaluation item, and if 10 means all 10 people, and if 1 means 1 out of 10 people.

The characteristics of methylhydrogenpolysiloxane will be described below by evaluating the polymerizability of methylhydrogenpolysiloxane. Table 5 shows the relationship between the average degree of polymerization, the structure, and the minimum heating condition, which were examined according to the evaluation method.

[0039]

[Table 5]

[0040]

[Chemical 7] (However, m = n, m + n = 30 to 50)

[0041]

[Chemical 8] (However, a = 30 to 50)

[0042]

[Chemical 9] (However, k = 21 to 30)

[0043]

[Chemical 10] (However, k = 15 to 20)

[0044]

[Chemical 11] (However, k = 7 to 10)

[0045]

[Chemical 12]

From Table 5, the conventional methyl hydrogen polysiloxanes represented by Chemical Formulas 7 and 8 are represented by Chemical Formulas 9 to 1
It can be seen that the minimum heating condition is stricter than that of the methyl hydrogen polysiloxane used in the present invention shown in No. 1. It is also understood that among the methylhydrogenpolysiloxanes used in the present invention, those having the average degree of polymerization shown in Chemical formulas 9 and 10 are more reactive. In addition, Chemical formula 9, Chemical formula 10 and Chemical formula 11 are respectively referred to as MH
PS treatment agent (A), MHPS treatment agent (B) and MHPS
It is abbreviated as a treating agent (C).

Hereinafter, the method for producing the modified powder will be described in Examples 1 to 10. Example 1 100 g of fine particle titanium oxide (primary particle diameter 35 nm, anatase type) was mixed with 17 g of MHPS treatment agent (B) using a mixer. Primary heat treatment was performed at 80 ° C. for 1 hour using a blower dryer, and subsequently the temperature was raised to 105 ° C. and then heat treatment was performed for 1 hour.

Comparative Example 1 100 g of fine particle titanium oxide (primary particle size 35 nm, anatase type) was coated with 17 g of methyl hydrogen polysiloxane (KF-99P, manufactured by Shin-Etsu Chemical Co., Ltd.) using an air blender (air temperature 50 ° C.). . Primary heat treatment was performed at 80 ° C. for 1 hour using a blower dryer, and subsequently the temperature was raised to 105 ° C. and then heat treatment was performed for 1 hour.

Example 2 1000 g of fine particle titanium oxide (primary particle size 17 nm, amorphous type) was mixed with 300 g of sericite, and then 130 g of MHPS treating agent (A) was added. Using a blast dryer, the temperature is 1 ℃ per minute from room temperature to 95 ℃ (total 70 minutes)
The heat treatment was performed for 0.5 hour after the temperature was raised to 130 ° C.

Example 3 Fine particle titanium oxide (primary particle diameter 45 nm, rutile type) 5
35 g of the MHPS treating agent (A) was added to 00 g, and the mixture was stirred and mixed using a mixer. Then, heat treatment was carried out at 95 ° C. for 5 hours using a blow dryer.

Comparative Example 3 Fine Titanium Oxide (Primary Particle Diameter 45 nm, Rutile Type) 5
Methyl hydrogen polysiloxane (KF
-99P, manufactured by Shin-Etsu Chemical Co., Ltd.), a solution prepared by dissolving 35 g in 100 g of isopropyl alcohol was added, stirred and mixed, and then the solvent was distilled off, and then 95 ° C. using a blast dryer.
Then, the heat treatment was performed for 5 hours.

Example 4 1 kg of sericite and 20 g of the MHPS treating agent (C) were mixed and stirred using a Henschel mixer. Then, after heat-treating at 110 ° C. for 4 hours using a dryer, 18
Heat treatment was performed at 0 ° C. for 3 hours.

Example 5 1 Kg of talc and 210 g of the MHPS treating agent (A) were mixed and stirred using a Henschel mixer. Then, after heat-treating at 110 ° C. for 4 hours using a dryer, 190
Heat treatment was performed at 3 ° C. for 3 hours.

Example 6 After mixing 100 g of yellow iron oxide (primary particle size 0.7 μm) and 25 g of sericite, 3.8 g of MHPS treating agent (B)
Were mixed using a spray. Then, using a blast dryer, a speed of 0.4 ° C / min (total of 75 ° C) from 60 ° C to 90 ° C was obtained.
The heat treatment was performed for 1 hour after the temperature was raised to 105 ° C.

Comparative Example 3 After mixing 100 g of yellow iron oxide (primary particle diameter 0.7 μm) and 25 g of sericite, 3.8 g of methyl hydrogen polysiloxane (KF-9901, manufactured by Shin-Etsu Chemical Co., Ltd.) was sprayed. Mixed. Then, using a blast dryer, a speed of 0.4 ° C / min (total of 75 ° C) from 60 ° C to 90 ° C was obtained.
The heat treatment was performed for 1 hour after the temperature was raised to 105 ° C.

Example 7 After mixing 100 g of red iron oxide (primary particle size 0.7 μm) and 25 g of sericite, 3.8 g of MHPS treating agent (B)
Were mixed using a spray. Then, heat treatment was performed at 120 ° C. for 1 hour using a blower dryer.

Example 8 After mixing 100 g of black iron oxide (primary particle size 0.6 μm) and 25 g of sericite, 3.8 g of MHPS treating agent (B)
Were mixed using a spray. Then, using a blast dryer, a speed of 0.4 ° C / min (total of 75 ° C) from 60 ° C to 90 ° C was obtained.
The heat treatment was carried out for 1 hour after the temperature was raised to 100 ° C.

Example 9 900 g of titanium oxide (primary particle size: 0.6 μm) was mixed with 100 g of sericite, and then MHPS treating agent (C) 4
0g was added using an air spray, and it stirred and mixed using the mixer. 60 ℃ to 120 ℃ using blast dryer
Was subjected to primary heat treatment at a rate of 2 ° C. per minute (total of 30 minutes), then heated to 130 ° C., and then subjected to secondary heat treatment for 0.4 hours.

Comparative Example 4 900 g of titanium oxide (primary particle size: 0.6 μm) was mixed with 100 g of sericite, and then methylhydrogenpolysiloxane (KF-9901, manufactured by Shin-Etsu Chemical Co., Ltd.) 40
A solution of 1000 g of isopropyl alcohol in 1000 g was added, and the mixture was stirred and mixed using a mixer. After distilling off the solvent, primary heat treatment was performed at a rate of 2 ° C / min (total of 30 minutes) from 60 ° C to 120 ° C using a blast dryer.
Then, after heating up to 130 degreeC, the secondary heat treatment was performed for 0.4 hours.

Example 10 100 g of mica titanium and 8 parts of MHPS treating agent (A) were dispersed in 120 parts of trichlene, and then the solvent was distilled off. The obtained powder was pulverized using a mixer, and then heat-treated at 180 ° C. for 1 hour using a blow dryer.

Comparative Example 5 100 g of mica titanium and 8 parts of cyclic methyl hydrogen polysiloxane (KF-9902, manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed using a mixer. The obtained powder was heat-treated at 180 ° C. for 1 hour using a blow dryer.

Examples of cosmetics using the modified powders prepared in Examples 1 to 10 will be described below in Examples 11 to 13. In the following, all% means% by weight. Example 11 Foundation A foundation was prepared according to the following formulation.

[0063]

[Table 6]

Ingredient A was placed in a Henschel mixer and mixed for 5 minutes. To this was added ingredient B, which had been uniformly mixed and dissolved in advance, and then mixed for 10 minutes. Then, it was crushed with a crusher. After that, it was pressed and filled into a product. The product was left in the sun for 1 week, but no discoloration or odor was observed.

Comparative Example 6 Foundation A foundation was prepared according to the following formulation.

[0066]

[Table 7]

Ingredient A was placed in a Henschel mixer and mixed for 5 minutes, to which ingredient B, which had been uniformly mixed and dissolved in advance, was gradually added and subsequently mixed for 10 minutes. Then, it was crushed with a crusher. After that, it was pressed and filled into a product. This product lacked water resistance and was easily broken. When this product was left in the sun for 1 week, discoloration and odor were observed.

Example 12 Eye Shadow An eye shadow was prepared according to the following formulation.

[0069]

[Table 8]

Ingredient A was placed in a Henschel mixer and mixed for 5 minutes, to which ingredient B, which had been uniformly mixed and dissolved in advance, was gradually added and subsequently mixed for 10 minutes. Then, it was crushed with a crusher. After that, it was pressed and filled into a product.

Comparative Example 7 Eye Shadow An eye shadow was prepared according to the following formulation.

[0072]

[Table 9]

Ingredient A was placed in a Henschel mixer and mixed for 5 minutes, to which ingredient B, which had been uniformly mixed and dissolved in advance, was gradually added and subsequently mixed for 10 minutes. Then, it was crushed with a crusher. After that, it was pressed and filled into a product.

Example 13 Sun oil

[0075]

[Table 10]

Component A was gradually added to component B that had been uniformly mixed and dissolved, and mixed using a sand mill to obtain a product. The obtained product was excellent in transparency. In addition, it did not discolor under sunlight.

Comparative Example 8 Sun oil

[0078]

[Table 11]

Component A was gradually added to component B that had been uniformly mixed and dissolved, and mixed using a sand mill to obtain a product. The obtained product was excellent in transparency, but turned blue under sunlight.

[0080]

[Table 12]

[0081]

[Table 13]

[0082]

[Table 14]

From Table 12, it was confirmed that the modified fine particle powder of the present invention had less secondary aggregation and excellent water repellency, and the catalytic activity of fine particle titanium oxide was also blocked. From Table 13, it was confirmed that the modified powder of the present invention had less secondary aggregation and was excellent in water repellency. From the results of Table 12 and Table 13, it was found that the modified powder treated by the method of the present invention showed good performance regardless of the size of the powder.

Further, from the comparison between Example 3 and Comparative Example 2 and between Example 9 and Comparative Example 4, it can be seen that the presence of the solvent has an adverse effect such as secondary aggregation. Further, from the results of Table 14, it was confirmed that when the modified powder of the present invention was blended with a cosmetic, a cosmetic having a dry feel and having a good feel was obtained. Furthermore, comparing the results of the light resistance of Example 11 and Comparative Example 6, it can be seen that the light resistance of Example is extremely improved.

[0085]

As described above, according to the present invention, the secondary agglomeration can be prevented by coating the powders with methylhydrogenpolysiloxane having a specific structure and then performing a heat treatment under a specific temperature condition. It is clear that it provides a modified powder that is less and has excellent water repellency and that has a catalytic activity blocked, and that by blending this modified powder, a cosmetic product having excellent quality stability and feel is provided. Is.

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[Procedure amendment]

[Submission date] January 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

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[Chemical 1] (However, k is an average number, and k = 7 to 30)

[Procedure Amendment 2]

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[Name of item to be corrected] Claim 2

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[Chemical 2] (However, k is an average number, and k = 7 to 30)

[Procedure 3]

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[0003]

[Chemical 3] (However, a = 30 to 50)

[Procedure amendment 4]

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[0008]

[Chemical 5] (However, k is an average number, and k = 7 to 30)

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[0016]

[Chemical 6] (However, k is an average number, and k = 7 to 30)

[Procedure correction 6]

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[0041]

[Chemical 8] (However, a = 30 to 50)

[Procedure Amendment 7]

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[0042]

[Chemical 9] (However, k = 21 to 30)

[Procedure Amendment 8]

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[0043]

[Chemical 10] (However, k = 15 to 20)

[Procedure Amendment 9]

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[0044]

[Chemical 11] (However, k = 7 to 10)

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display area C09B 67/08 C 7306-4H

Claims (4)

[Claims] 1. A modified powder, which is obtained by mixing powders and a compound represented by the following general chemical formula, and then performing heat treatment at 80 to 200 ° C. for 0.5 to 5 hours. [Chemical 1] (However, k is an average number, and k = 7 to 30) 2. After mixing the powder and the compound represented by the following general chemical formula, primary heat treatment is performed at 60 to 120 ° C. for 0.5 to 4 hours, and subsequently at a temperature higher than that of the primary heat treatment. And a modified powder obtained by performing a secondary heat treatment at 80 to 200 ° C. for 0.2 to 3 hours. [Chemical 2] (However, k is an average number, and k = 7 to 30) 3. The powders are fine particle titanium oxide having a primary particle diameter of 5 to 50 nm, fine particle zinc oxide, fine particle iron oxide, and fine particle low order titanium oxide.
The modified powder according to 1. 4. A cosmetic material comprising the modified powder according to any one of claims 1 to 3.