JPH0714849B2 - Skin cosmetics containing fine powder of animal hair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a skin cosmetic containing a fine powder obtained by extremely finely crushing animal hair, particularly a scale-like fine powder.

[Conventional technology]

Skin cosmetics contain various oils, moisturizers, drugs, surfactants, polymers, fragrances, etc. in order to obtain an emollient effect and moisturizing effect, or from the viewpoint of formulation technology, etc. .

However, although those oils, moisturizers, chemicals, surfactants, polymers, fragrances, etc. have the functions which are their original purpose of blending, on the other hand, they give a sticky feeling to the user, so a large amount or component In some cases, it was difficult to mix even a small amount.

In order to suppress this stickiness, a technique of blending various inorganic powders and porous resins, a technique of blending wool powder (JP-A-54-70435), and a technique of blending silk powder and wool powder (JP-A- No. 55-27120) and the like are known.

[Problems to be solved by the invention]

However, when an inorganic powder or a porous resin is added in an amount sufficient to suppress stickiness, the original functions of other components such as oil and moisturizer are impaired, and there are drawbacks in the usability of the powder such as squeak and roughness. Problems such as going out occur. Further, the wool powder and the silk powder described in JP-A-54-70435 and JP-A-55-27120 have relatively large particle diameters adjusted by a conventional pulverizing method, The cosmetics containing these were not always satisfactory in terms of stickiness, familiarity with the skin and transparency.

Therefore, an object of the present invention is to provide a skin cosmetic which eliminates stickiness and improves the familiarity and transparency to the skin while completely maintaining the original functions of the various ingredients in the skin cosmetic. is there.

[Means for solving problems]

The present inventor achieves the above-mentioned object by incorporating a fine powder of animal hair, which has been obtained by utilizing the circulating vacuum pulverization technique and is much finer than the conventional one, into a skin cosmetic. I found that I can do it. Therefore, the present invention provides a skin cosmetic containing an animal fine powder having an average major axis of 30 μm or less and an aspect ratio of 4 or more.

In the present specification, “skin cosmetics” means facial cosmetics and body cosmetics, and quasi-drugs and external medicines that are equivalent thereto. Examples of facial cosmetics include creams such as cleansing cream, massage cream, moisturizing cream, milky lotions such as cleansing emulsion, nutritional emulsion, astringent lotion, soft lotion, lotion such as cleansing lotion, packs, etc. Can be given. Examples of body cosmetics include body cream, hand cream, hand lotion, body lotion, leg cream, and leg lotion. Examples of the above quasi drugs and external medicines include baby powder, deodorant powder, spray antiperspirant, stick antiperspirant, roll-on antiperspirant and the like.

As used herein, "animal hair" means animal hair, human hair, bird feathers and bird feathers. Examples of animal hair include wool, mink hair, normal goat hair, mohair hair, Tibetan hair, camel hair, cashmere hair, llama hair, alpaca hair, guanaco hair, angora rabbit hair, cow hair, ordinary rabbit hair, horse hair, cats. There is hair, pig hair, etc. Examples of the feathers and feathers of birds include feathers and feathers of moths, ducks, other waterfowls, chickens and the like.

The fine powder to be added to the skin cosmetic of the present invention can be prepared, for example, by utilizing a circulating vacuum pulverization technique. The circulation vacuum pulverization is carried out by using a circulation type vacuum pulverization apparatus which is a further improvement of the known vacuum pulverization apparatus (Japanese Patent Publication No. 52-11787) according to the present invention. The above-mentioned known vacuum crushing device is (a) as described in the above publication.
A crushed material container for loading a raw material to be treated, (b) a crusher equipped with a hammer and a ridge, (c) a crushed material container for collecting products, and (d) a connection interposed therebetween.
Transfer means, and (e) storage device for crushed material (a)
And a vacuum pump connected to the crushed material container (c). The present inventor has improved the vacuum crushing device to replace the hammer and the projecting piece in the crusher (b) with a rotary blade and a fixed blade, and to provide the outlet of the crushed material container (c) and the crushed object. The inlet of the material container (a) was connected to enable circulation and pulverization under vacuum. Circulating vacuum crushing of animal hair using this improved device results in much finer crushing of animal hair than conventional ones.

The circulating vacuum crushing is 2 to 30 mmHg, preferably 2 to 10 mmHg.
It is carried out under a vacuum of mmHg. The circulation is performed 2 to 10 times, preferably 3 times. Before carrying out the above-mentioned circulation vacuum pulverization, animal hair as a raw material can be degreased with an organic solvent such as diethyl ether, acetone, chloroform or trichloroethane, or degreased and washed with various surfactants. A commercially available product after degreasing / washing treatment can be used as it is.

The product is classified after the circulating vacuum milling process. As the classification method, a method known per se, for example, screening with a sieve, wet classification or dry classification can be used. Dry classifiers such as gravity classifiers, inertial classifiers, especially centrifugal classifiers, are preferably used, and forced vortex centrifugal classifiers are particularly preferred. Fine powder mainly composed of cuticle (hair scalp) forming the outermost layer of animal hair by adopting an appropriate classification means (in this case, for example, forced vortex centrifugal classifier (separation diameter 0.5 to 50 μm) Preferably 0.5 to 30 μm)], or other parts, ie cortex and cortex (medullary pulp)
A fine powder containing a large amount of can be obtained.

The above-mentioned animal hair dyeing, bleaching, UV treatment, electrostatic treatment, water repellent treatment, insect repellent treatment, antiseptic treatment, antifungal treatment, and other surface treatments may be performed before or after the circulating vacuum pulverization treatment or before or after the classification treatment. Although it can be carried out in any case, it is preferably carried out after the classification treatment.

For dyeing, for example, Red No. 3, Red No. 104, Yellow No. 4, Yellow No. 5, Green No. 3, Blue No. 1, Blue No. 2, Red
No. 227, Red 230, Orange 206, Orange 207, Yellow 202
Stain according to a conventional method with natural dyes such as No. 1, No. 201, No. 201, No. 204, No. 205, etc., tarmin, carminic acid, laccaic acid, calsamine, bradylin, crocin, annatto, anthocyanin, safrole yellow, red pickle dye, etc. be able to. Regarding the UV treatment, for example, salicylic acid,
An ultraviolet absorber such as para-aminobenzoic acid or urocanic acid can be adsorbed by a conventional method. A fine powder having an average major axis of 20 μm or less and an aspect ratio of 4 or more is obtained by the circulating vacuum pulverization and classification. The obtained fine powder is mainly composed of scale-like (plate-like) fine powder.

In the present specification, the size of the fine powder is measured as follows. The fine powder obtained was suspended in a dispersion medium such as acetone, placed on a sample table made of aluminum, dried, and then gold-deposited to form a sample. Take a micrograph. Since the image pattern of fine powder is indefinite, the longest diameter is defined as "major axis", and the major axis is measured for at least 50, preferably 100 or more fine powders, and the average value is defined as "average major axis". . Also,
The longest diameter of the above-mentioned "major axis" and the diameter at right angles is defined as "minor axis", and the biaxial average of each fine powder, that is, ("major axis" + "minor axis") x 1/2, is calculated. The average value obtained from the individual biaxial averages in the same manner as above is referred to as "average biaxial average". On the other hand, a sample was prepared from the fine powder in the same manner as above, the sample stage was tilted at about 45 °, and an electron micrograph of the flaky fine powder was taken from the side. The “average thickness” is obtained in the same manner as above. Next, "average biaxial average" / "average thickness"
And calculate this as the "aspect ratio".

The fine powder measured by the above method has an average major axis of 30 μm.
The following is preferably 1 to 20 μm, more preferably 2 to 10 μm,
Average biaxial average 1 to 20 μm, especially 2 to 10 μm, average thickness 5
It has an aspect ratio of 4 or more, preferably 7 to 100.

When the surface area of fine powder of said measured by the BET method is at 0.1 m ² / g or more, especially from 0.5 to 5 m ² / g.

When the fine powder is observed with an electron microscope, a large number of scale-like powders are visible. Also, in the amino acid composition of the fine powder,
Since the amounts of serine, proline and cystine are high, it is considered that cuticle is the main component. Therefore, the circulating vacuum crushing process is performed to crush individual cuticle units. As described above, since individual cuticle units are crushed, the same crushing is performed at least partially on the animal hair cortex (cortex) and medula (hair pulp). It is considered to be a thing.

In the present invention, the fine powder is contained in the skin cosmetic in an amount of 0.001% by weight or more, preferably 0.1% by weight or more, based on the weight of the cosmetic.

The dosage form of the skin cosmetic of the present invention is arbitrary, and any dosage form such as a solution system, an emulsion system, a powder dispersion system, a water-oil two-layer system, and a water-oil-powder three-layer system may be used.

The skin cosmetics of the present invention, depending on the type of skin makeup, oil, water, surfactants, humectants, lower alcohols,
Thickeners, polymers, fragrances, agents, antioxidants, chelating agents, dyes, antiseptic / antifungal agents, powders, UV absorbers and other components usually used in skin cosmetics can be added.

〔Example〕

Next, the present invention will be described in more detail by way of examples.
The present invention is not limited thereby.

Preparation of compounding ingredients Production example 1: Wool fine powder utilizing circulating vacuum crushing 50 kg of merino type wool that has been degreased and washed by a conventional method and pre-sliced is vacuum-milled (Sawawa Kasei: SWM-48
(Type) circulation-type improving apparatus, the material to be crushed was loaded, the system was evacuated (5 mmHg), and then crushed by operating for 6 hours under the conditions of 5.5 KWh and 3000 rpm. It should be noted that the required time is 2 when the powder frame is similarly used without circulating this device.
Since it was time, this treatment means that the milling treatment was repeated three times on average.

Next, a forced vortex centrifugal classifier (Nissin Engineering: T
C-15N type (separation diameter 20 μm)]
4.5 kg of fine powder having a size of μm or less was obtained. The results of observing the resulting fine powder with a scanning electron microscope (JEOL: JSM-T100 type) are shown in FIGS. 1 and 2.

The fine powder thus obtained is considered to have cuticle as a main component. The reason is as follows.

(1) The amino acid composition of the fine powder was in good agreement with the amino acid composition of the cuticle of the raw material wool (there were more serine, cystine and proline in the cuticle than in the whole wool).

(2) The shape of the fine powder shown in the electron micrographs (FIGS. 1 and 2) is scale-like, which matches the shape of the cuticle.

(3) The yield of fine powder is almost equal to the weight ratio of cuticle in wool (about 10%).

The fine wool powder had an average major axis of 7.6 μm and an aspect ratio of 10.8.

Production Example 2: Fine powder of moth bird feathers using circulating vacuum pulverization When the feathers of moth birds were treated in the same manner as in Production Example 1, the same fine powder was obtained.

Production Example 3: Mohair fine powder utilizing circulating vacuum grinding When mohair was treated by the same method as in Production Example 1, the same fine powder was obtained.

Production reference example: Wool powder by freeze-grinding Merino wool 10 degreased and washed by the usual method
0 g was immersed in 1.0 kg of water for 3 hours, followed by centrifugal dehydration to adjust the water content to 80 g. This is frozen in liquid nitrogen (-196 ° C) and crusher [Fuji Denki Kogyo: Sample Mill (K
II-1 type)].

The results of observing the thus obtained wool powder with a scanning electron microscope (JEOL: JSM-T100 type) are shown in FIG.

Reference example: Measurement of water absorption and oil absorption The limit of the amount that a powder can absorb a liquid is usually called the liquid absorption, and the condition of the powder is observed while adding a small amount of the liquid to 100 g of the powder and kneading. Then, the point of forming one lump from the dispersed state was found, and the weight (g) of the liquid added up to that point was taken as the liquid absorption amount of the powder. The amount of liquid absorption varies greatly depending on the nature of the surface of the powder, but the size of the particles has a particularly large effect, and the smaller the particle size, the greater the amount of liquid absorption.

The results of measuring the water absorption using distilled water and the oil absorption using liquid paraffin and isopropyl myristate as oils are shown in Table 1 below.

Formulation of skin cosmetics Example 1: Nutrition creams Nutrition creams X, Y and Z having the compositions (unit:% by weight) shown in Table 2 below were prepared.

Nutrition creams X and Z were prepared as follows. The aqueous phase part B was heated and stirred at 70 ° C. to well disperse the fine wool powder or the wool powder. The oil phase part A was heated to 70 ° C. to completely dissolve it, and then the oil phase part A was mixed with the aqueous phase part B and emulsified by an emulsifying machine. The emulsion was cooled to 30 ° C. by a heat exchanger and then filled in a container. Nutrition cream Y was prepared as above without the use of fine wool powder.

Next, 20 beauty technicians conducted a usage test to evaluate the stickiness and skin familiarity of each nutritional cream.
The evaluation was performed according to the criteria shown in Table 3 below.

The results of the above-mentioned use test are shown in the following 4th vote depending on the number of evaluation persons.

The nutritional cream X according to the invention was superior to the others.

Example 2: Nutritional emulsion By the same method as in Example 1, a nutritional emulsion X of the present invention having the following composition was prepared.

(Wt%) A. Beeswax 1.0 Vaseline 2.5 Lanolin 1.5 Jojoba oil 5.0 Cetyl isooctanoate 4.0 Polyoxyethylene (60) Hydrogenated castor oil 2.0 Ethylparaben 0.2 Butylparaben 0.1 Perfume 0.2 B. Glycerin 2.0 Propylene glycol 5.0 1,3- Butylene glycol 3.0 Carboxyvinyl polymer 0.2 Wool fine powder of Production Example 1 15.0 Potassium hydroxide 0.12 Purified water based on the total amount of 100 A comparative milk emulsion Y was prepared in the same manner as above except that the wool fine powder was not included. . The results of the same usage test as in Example 1 are shown in Table 5 below.

Example 3: Two-layer type lotion A two-layer type lotion X of the present invention was prepared by mixing the following components and filled in a container.

(Wt%) Ethanol 10.0 Glycerin 15.0 Dipropylene glycol 3.0 Polyoxyethylene (20) -2-octyldodecyl ether 0.8 Vitamin E acetate 0.2 Citric acid 0.05 Sodium citrate 0.1 Perfume 0.1 Wool fine powder of Production Example 1 25.0 Purified water overall A two-layer lotion Y for comparison was prepared in the same manner as above except that it did not contain fine wool powder, and the same usage test as in Example 1 was conducted. The results are shown in Table 6.

Example 4: Sunscreen emulsion In the same manner as in Example 1, a sunscreen emulsion X of the present invention was prepared from the following composition.

(Wt%) A. Stearic acid 1.0 Squalane 10.0 Glycerol monostearate 1.5 Ethyl paraben 0.2 Butyl paraben 0.2 Octyl dimethyl p-dimethylaminobenzoate 5.0 Fragrance 0.15 B. Glycerin 5.0 Fine particle titanium oxide 1.0 Montmorillonite 0.5 Wool fine powder of Production Example 1 2.5 Potassium hydroxide 0.2 Purified water based on the total amount of 100 A sunscreen emulsion Y for comparison was prepared in the same manner as above except that it did not contain fine wool powder. The results of the same usage test as in Example 1 are shown in Table 7 below.

In addition, the sunscreen emulsion X of the present invention was more safe than the comparative sunscreen emulsion Y.

Example 5: Cleansing Cream By the same method as in Example 1, a cleansing cream having the following composition was prepared.

(Wt%) A. Cetanol 2.0 Beeswax 1.0 Solid paraffin 1.0 Stearic acid 2.0 Vaseline 8.0 Liquid paraffin 27.5 Pentaerythritol tetra-2-ethylhexanoate
10.0 Evening primrose oil 0.5 Olive oil 5.0 Polyoxyethylene (20) sorbitan 2.4 Stearic acid ester (TWEEN60) Glycerol monostearate 2.6 Propylparaben 0.3 Perfume 0.25 B. Glycerin 2.0 Dipropylene glycol 7.0 Fine powder of production example 2 Bird feathers 5.0 Water Potassium oxide 0.08 Amount of purified water as 100 Example 6: Summer oil After mixing and dissolving the following components, a summer oil was prepared and filled in a container.

(Wt%) Liquid paraffin 30.0 Olive oil 32.48 Glycerol tri-2-ethylhexanoate 25.0 2-Ethylhexyl p-dimethylaminobenzoate 2.0 Fine mohair powder of Production Example 10.0 Dibutylhydroxytoluene 0.02 Fragrance 0.5 Example 7: Pack cosmetics Each of the following components was heated and mixed to 80 ° C. to prepare a pack cosmetic, which was filled in a container.

(% By weight) Polyvinyl alcohol (saponification degree 90, degree of polymerization 2000) 10.0 Ethanol 10.0 Glycerin 10.0 Dyeing of wool fine powder of Production Example 1 (Red No. 104) 15.0 Fragrance 0.2 Purified water Total 100 The above dyed wool fine powder was prepared as follows.

30 g of Red No. 104 and 300 g of sodium sulfate were dissolved in water 3, and 100 g of the circulating vacuum pulverized wool fine powder obtained in the above Production Example 1 was added and dispersed. To this, 90 g of citric acid was added to insolubilize the dye, and the dye was adsorbed on the wool surface. Then 80 ℃
The dye was diffused inside the fine wool powder by heating the mixture to reflux for 2 hours. After filtering, drying, and pulverizing with a mortar, a wool fine powder dyeing material was obtained.

Example 8: Emulsified cream (W / O) An emulsified cream (W / O) having the following composition was prepared.

(Wt%) A. Ethanol 3.5 Solid paraffin 2.0 Vaseline 3.5 Liquid paraffin 35.0 Squalane 5.0 Ethylparaben 0.2 Fragrance 0.25 Fine wool powder of Production Example 4.5 B. Glycerin 5.0 Propylene glycol 5.0 Purified water 100 as the total amount Oil phase A Was heated and stirred at 80 ° C., and the fine wool powder of Production Example 1 was well dispersed therein. After the aqueous phase part B was heated to 70 ° C. to completely dissolve it, the aqueous phase part B was mixed in the oil phase part A and emulsified by an emulsifying machine. The emulsion was cooled to 30 ° C. by a heat exchanger and then filled in a container.

When the same amount of the freeze-milled wool powder prepared in Production Reference Example was used instead of using the above-mentioned wool fine powder, an emulsion could not be obtained.

Table 8 below shows the results of carrying out the same use test as in Example 1 on the cosmetics according to the present invention of Examples 5 to 8 above.

Example 9: Deodorant powder A deodorant powder X of the present invention having the following composition was prepared.

(Wt%) Wool fine powder of Production Example 1 90.8 Zinc white 3 Aluminum hydroxychloride 3 Iron oxide pigment 0.1 Liquid paraffin 3 Fragrance 0.1 Wool fine powder, zinc white, aluminum hydroxychloride and iron oxide pigment were mixed with a Henschel mixer. Then, a mixture of liquid paraffin and a flavor was heated and sprayed onto this mixture, and the mixture was further mixed and then pulverized by a 5 pulsarizer (Hosokawa Micron) and molded into a medium plate to obtain the deodorant powder X of the present invention. It was

On the other hand, a deodorant powder Y for comparison was obtained in the same manner as described above except that talc was used instead of the circulating vacuum crushed wool fine powder of Production Example 1.

The deodorant powder X according to the present invention had a smoother feel than the comparative deodorant powder Y and was naturally adapted to the skin, and had good aroma retention. Both powders were applied to the inside of the elbow and repeated bending and stretching, powder Y
Powder sway was observed after 30 times, but powder X was not observed until 50 times.

Example 10: Baby Powder (Powdered) A baby powder X of the present invention having the following composition was prepared.

(Wt%) Wool fine powder of Production Example 1 94.4 Zinc white 5.0 Liquid paraffin 0.5 Fragrance 0.1 Wool fine powder and zinc white are mixed with a Henschel mixer,
A liquid mixture of liquid paraffin and perfume was heated and sprayed onto this mixture, and the mixture was further mixed and then pulverized with a 5 pulsarizer (Hosokawa Micron) and filled in a container to obtain Baby Powder X of the present invention.

On the other hand, a baby powder Y for comparison was obtained in the same manner as described above except that talc was used in place of the circulating vacuum crushed wool fine powder of Production Example 1.

The baby powder X of the present invention is a baby powder Y for comparison.
Compared with, it had a silky feel, was naturally adapted to the skin, had good aroma retention, and had less powder wandering over time.

Example 11: Baby powder (pressed form) A baby powder X of the present invention having the following composition was prepared.

(% By weight) Wool fine powder of Production Example 1 71.9 Talc 20 Zinc white 5 Liquid paraffin 3 Perfume 0.1 Wool fine powder, talc and zinc white were mixed with a Henschel mixer, and liquid paraffin and a perfume were added to this mixture. Spray the mixture that was heated and mixed, and further mix
A baby powder X of the present invention was obtained by crushing with a pulverizer (Hosokawa Micron) and molding into a medium dish.

On the other hand, a comparative baby powder Y was obtained in the same manner as described above except that 50% by weight of mica and 21.9% by weight of talc were used instead of 71.9% by weight of fine wool powder.

The powder X of the present invention had better moldability, higher impact resistance, a smooth feel, was naturally adapted to the skin, was excellent in aroma retention, and had less powder wandering over time as compared with the comparative powder Y. .

Example 12: Powder spray type antiperspirant An antiperspirant X of the present invention having the following composition was prepared by a conventional method.

(Wt%) Aluminum hydroxychloride 1.3 Silica 0.1 Talc 1.1 Wool fine powder of Preparation Example 0.5 Isopropyl myristate 1.0 Propellant 96.0 (Dichlorodifluoromethane 60%, Trichloromonofluoromethane 20% and n-butane 20) %) A comparative antiperspirant Y was prepared in the same manner as above except that it did not contain wool fine powder. The antiperspirant X of the present invention has a smoother feel than the comparative antiperspirant Y and does not cause wrinkling.
The transparency after coating was excellent.

Example 13: Stick-type antiperspirant An antiperspirant X of the present invention having the following composition was prepared by a conventional method.

(Wt%) Aluminum hydroxy chloride 20 Fine wool powder of Production Example 5 Stearyl alcohol 22 Isopropyl myristate 1 Decamethylcyclopentasiloxane 51.4 BHT 0.1 Fragrance 0.5 The same amount as described above except that the same amount of talc was used instead of fine wool powder. Comparative antiperspirant Y was prepared in the same manner as in. The antiperspirant X of the present invention spread better and slippery than the comparative antiperspirant Y, was refreshed even after use, and was excellent in transparency after application.

Example 14: Roll-on antiperspirant An antiperspirant X of the present invention having the following composition was prepared by a conventional method.

(Wt%) Water 30 Montmorillonite 1 Cetanol 5 Wool fine powder of Production Example 1 Aluminum hydroxychloride 50 Octamethylcyclotetrasiloxane 13 Wool fine powder 1 wt% and aluminum hydroxychloride 50 wt% Instead of aluminum hydroxychloride 51 wt% A comparative antiperspirant Y was prepared in the same manner as described above, except that the amount of% was used. The antiperspirant X of the present invention did not have a sticky feeling after use and was refreshing as compared with the comparative antiperspirant Y.

Example 15: Anhydrous roll-on antiperspirant An antiperspirant X of the present invention having the following composition was prepared by a conventional method.

(Wt%) Aluminum hydroxy chloride 15 Moth bird feather fine powder of Production Example 2 Quaterium-18-hectorite 3 Ethanol 2 Decamethylcyclopentasiloxane 78 Moth except that the same amount of talc was used in place of the bird feather fine powder. Comparative antiperspirant Y was prepared in the same manner as described above. The antiperspirant X of the present invention was superior to the comparative antiperspirant Y in transparency after application and was refreshing.

Example 16: Clear-roll-on antiperspirant An antiperspirant X of the present invention having the following composition was prepared by a conventional method.

(Wt%) Decamethylcyclopentasiloxane 10 Quaterium-18-hectorite 0.5 Anhydrous ethanol 0.5 Aluminum hydroxychloride 15 Mohair fine powder 2 of Production Example 2 Isobutane 72 The same amount of talc was used instead of the mohair fine powder. Comparative antiperspirant Y was prepared in the same manner as in. The antiperspirant X of the present invention was lighter than the comparative antiperspirant Y and was excellent in transparency after application.

〔The invention's effect〕

The skin cosmetic of the present invention contains a scale-like fine powder of animal hair, which is much finer than conventional ones, without impairing the original functions of the ingredients such as oil and moisturizer. It suppresses the stickiness of them, improves the familiarity with the skin, and is excellent in transparency and aroma retention. Moreover, since the fine powder has an emulsifying action, it is advantageous when preparing an emulsified cosmetic. Furthermore, when it is necessary to mix a drug that damages the skin into cosmetics, the drug can be supported on a scaly fine powder to reduce the amount of direct contact with the skin, thus improving safety. You can

[Brief description of drawings]

1 and 2 are electron micrographs showing the shape of the fine wool powder used in the present invention obtained by using circulating vacuum crushing. FIG. 1 shows a magnification of 1000 times, and FIG. 2 shows a magnification. It is 5000 times. FIG. 3 is an electron micrograph at 100 × magnification showing the shape of wool powder obtained by conventional freeze-grinding.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiko Seno, Keiko Senoo, 1050 Shinba-cho, Kohoku-ku, Yokohama-shi, Kanagawa Inside Shiseido Research Institute Co., Ltd. No. Stock Company Seiwa Kasei (72) Inventor Yoichi Uemura 1-22-114, Nunoichi-cho, Higashiosaka-shi, Osaka Stock Company Seiwa Kasei (72) Inventor Hiroshi Shintani 1 Nunoichi-cho, Higashi-Osaka, Osaka Chome 2-14 Stock Company Seiwa Kasei (72) Inventor Toshio Nakano 1-214, Nunoichi-cho, Higashi-Osaka City, Osaka Prefecture 72-14 Stock Company Seiwa Kasei (72) Inventor Kei Adachi East 1-2-14, Nunoichi-cho, Osaka-shi Sekiwa Kasei Co., Ltd.

Claims (1)

[Claims] 1. An average major axis of 30 μm or less and an aspect ratio of 4.
Characterized by blending the above fine powder of animal hair,
Skin cosmetics.