JPH08113514A - Composite particles and cosmetic containing the same - Google Patents

Abstract

PURPOSE: To obtain composite particles excellent in economy which are prepared by coating the surfaces of powder particles used as a cosmetic powder directly with boron nitride powder, thus improved in unnatural glaring and finish while the merits of the boron nitride powder, namely spreadability, gloss, adhesion and the like is usefully maintained. CONSTITUTION: The mother particle of cosmetic powder such as nylon, mica, talc or the like is directly coated with boron nitride powder on its surface to give this composite particle. The amount of the coating boron nitride powder is 5-70wt.% based on the mother particle. The average particle size of the mother particle is pref. 1-50μm, and that of the boron nitride powder is 0.005-5μm. Especially, the composite particle of less than 0.5 regular reflectance is preferred. This composite particle is produced by allowing the boron nitride powder to adhere to the surface of organic particle statically, then strengthening the bond between them forcibly with a physical force. Or, a suspension containing an inorganic particle, boron nitride powder and a dispersant is spray- dried and calcined. The composite particles are added to a cosmetic in an amount of 1-80wt.%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to composite particles and cosmetics containing the same, and more particularly to composite particles in which the surface of mother particles is directly coated with boron nitride powder and cosmetics containing the same.

[0002]

2. Description of the Related Art Conventionally, various cosmetics containing powder are known. The powders used in these cosmetics are selected in consideration of their individual characteristics, that is, usability such as elongation, adhesiveness, smoothness, hiding power, and finish, and the amount thereof is also determined. ing. As a powder for cosmetics, boron nitride powder is incorporated into cosmetics for the purpose of improving elongation, gloss and adhesion (Japanese Patent Publication No. 62-49).
247).

However, while boron nitride powder has a high specular reflectance, it is glossy, but on the other hand, it has a glare, and cosmetics containing this powder have a glare and an unnatural finish. Had. Therefore, how to suppress the feeling of glare and unnatural finish without impairing the elongation and good adhesiveness of the boron nitride powder has been an issue.

As a method of lowering the density and cost while keeping the physical properties of the boron nitride powder, composite particles obtained by coating base material particles with a boron nitride powder via a coupling agent are already known. Front flat 6-50266
No. 1).

However, since the silane coupling agent and the titanate coupling agent are used for these composite particles, the manufacturing process is complicated, and although it is better than that using the boron nitride powder as it is, it still has a problem in economical efficiency. It was a thing. In addition, this method has not solved the problems of glare and unnatural finish when blended in cosmetics.

[0006]

Therefore, while utilizing the physical properties of the boron nitride powder such as elongation, gloss, and adhesion, it is possible to improve the feeling of glare and unnatural finish and to provide a composite particle having excellent economical efficiency. It was required to be provided.

[0007]

Means for Solving the Problems As a result of intensive studies to suppress the glare of boron nitride powder, the inventors of the present invention directly nitrided the surface of powder conventionally used as cosmetic powder. The inventors have found that the above problems can be solved by coating with boron powder, and have completed the present invention.

That is, the present invention provides composite particles obtained by directly coating the surface of mother particles with boron nitride powder, and cosmetics containing the same.

In the composite particles of the present invention, what can be used as the mother particles may be organic particles and inorganic particles which are blended into cosmetics as powder. Among these, examples of organic particles include nylon, polyethylene, polypropylene, polyester, polystyrene, polyurethane, styrene-acrylic copolymer, polymethylmethacrylate, epoxy resin, phenol resin, melamine resin, cellulose, polyolefin, silicone powder and the like. Examples of the inorganic particles include silicon oxide, aluminum oxide, titanium oxide, zinc oxide, calcium carbonate, magnesium carbonate, aluminum silicate, strontium silicate, barium silicate, calcium tungstate, clay minerals, mica, Examples include talc and kaolin.

The shape of the mother particles is not particularly limited and can be arbitrarily selected according to the purpose, but spherical is more preferable.

The average particle size of the mother particles used is not particularly limited, but is preferably 1 to 50 μm. If the average particle size is smaller than 1 μm, it becomes difficult to coat the boron nitride powder, and it becomes difficult to obtain composite particles having a smooth feel. On the other hand, when it exceeds 50 μm, a rough feel is generated.

On the other hand, the boron nitride (B
N) powders include h (hexagonal) -BN, w (wurtzite structure) -BN, c (cubic) -BN, r (rhombohedral).
Any powder of -BN and t (turbulent layer structure) -BN may be used, but it is preferable to use h-BN powder having a weak bonding force between layers and having good wettability.

The average particle size of the boron nitride powder used is not particularly limited, but is preferably 0.005 to 5 μm,
More preferably, it is 0.1 to 3 μm. When the average particle diameter is within this range, the coverage with the mother particles is improved, and composite particles with less glare can be obtained. In addition,
The average particle diameter of the boron nitride powder is represented by the equivalent circle diameter of the plane area.

The coating amount of the boron nitride powder on the base particles varies depending on the types of the base particles and the boron nitride powder and is not particularly limited, but preferably 5 to 70% by weight (hereinafter,
It is simply abbreviated as "%"). The amount of boron nitride powder is 5
If it is less than%, the characteristics of the composite particles of the present invention are hard to be expressed, and if it is more than 70%, many particles fall off from the mother particles, and it becomes difficult to obtain a smooth feel.

The following method is exemplified as a method for directly coating the surface of the mother particle with the boron nitride powder to obtain the composite particle of the present invention.

When the mother particles are organic particles composed of an organic soft material such as nylon or silicone, the mother particles and the boron nitride powder having the above-mentioned particle size are mixed at the above-mentioned mixing ratio, and the mixture is mainly charged with caustic. By utilizing the phenomenon, the boron nitride powder is attached to the surface of the mother particles by electrostatic force.

Then, in order to strengthen the bond between the mother particles and the boron nitride powder, a physical force is externally and forcibly applied to the mother particles to which the boron nitride powder is electrostatically adhered by an impact in a high-speed air stream. By such treatment, the surface of the polymer that constitutes the mother particles is partially softened by the interaction between the fine particles due to the friction or contact between the fine particles, and at the same time, the boron nitride powder is hardened by the physical force to be hardened there. Join.
For the purpose of forcibly applying physical force, well-known composite equipment such as high-speed jet stream grinder, hybridizer, mechanofusion, etc. is used, and the surface of the mother particle is directly coated with boron nitride powder by the above mechanism. To be done.

When the mother particles are inorganic particles composed of an inorganic hard material such as silicon oxide, the mother particles and the boron nitride powder having the above particle size are mixed in the above-mentioned mixing ratio, and A solvent containing a dispersant for uniformly dispersing the boron nitride powder, such as water, is added to form a suspension, and the suspension is stirred and mixed to sufficiently disperse the powder. This suspension is sprayed under hot air through a pressure spray nozzle. At this time, the solvent of the suspension evaporates during the process in which the atomized suspension is scattered, and the boron nitride powder adheres to the surface of the mother particles.

Further, in order to strengthen the bond between the mother particles and the boron nitride powder and to remove the remaining solvent, a baking treatment is performed in an inert gas atmosphere, for example, a nitrogen atmosphere.
For this purpose, a spray-drying spray dryer is used and the surface of the mother particles is directly coated with the boron nitride powder.

The composite particles of the present invention obtained as described above are
Although the boron nitride powder has excellent physical properties such as elongation, luster, and adhesion, the specular reflectance is lower than that of the boron nitride powder and has no glare, as shown in the test examples below. It is widely available as a powder for cosmetics. Further, since the composite particles of the present invention do not use a special chemical such as a coupling agent, they are economically advantageous.

The composite particles can be blended in all kinds of cosmetics,
For example, foundation, white powder, base cosmetics, blusher,
It can be blended in cosmetics such as eye shadow, lipstick, eyeliner, mascara, nail enamel, emulsion and cream. The blending amount is not particularly limited, but preferably 1 to 8
It is 0%.

Further, in the cosmetics containing the composite particles of the present invention, an aqueous component or an oil component used as a raw material for cosmetics, a powder component such as a humectant, a preservative, an antioxidant,
An ultraviolet absorber, a beauty ingredient, a fragrance, a water-soluble polymer, an extender pigment, a coloring pigment, a bright pigment, an organic powder, a hydrophobized pigment, a tar dye, etc. may be added within a range that does not impair the effects of the present invention. it can.

[0023]

EXAMPLES Next, the present invention will be further described with reference to examples. Note that these do not limit the present invention at all.

Example 1 Production of Nylon-Boron Nitride Composite Particles: (1) 50 g of anhydrous laurolactam, 200 ml of liquid paraffin (dispersion medium), and 1 g of sodium stearate (dispersion aid) were mixed. . This mixture was heated at 140 ° C. in a nitrogen atmosphere to dissolve laurolactam, and 0.2 ml of phosphorus trioxide as a polymerization accelerator was added,
Polymerization was carried out by mixing for about 1 hour to obtain a nylon powder. Further, the particles are separated by filtration, washed with boiling benzene, and dried under reduced pressure at 80 ° C. to obtain an average particle size of about 5
Nylon mother particles of μm were obtained.

(2) 70 g of the above mother particles and 30 g of boron nitride powder (h-BN, average particle size: 1 μm) are put into a ball mill and mixed for 30 minutes, and the boron nitride powder is mixed on the surface of the mother particles by electrostatic force. It was applied uniformly. further,
In order to strengthen the bond between the mother particles and the boron nitride powder, the mixed particles are put into a crushing chamber of a high-speed jet airflow crusher, and friction and collision of the particles are caused by a high-speed jet jet of 200 m / sec. The boron nitride powder was embedded in the surface of the mother particles. The composited particles went up in the grinding chamber and were collected through a classifier. The processing time during this period was 10 minutes.

Example 2 Preparation of silicone-boron nitride composite particles: average particle size 1
70 g of 0 μm silicone powder and 30 g of boron nitride powder having an average particle diameter of 1 μm were compounded in the same manner as in Example 1 (2) to obtain silicone-boron nitride composite particles having an average particle diameter of 10 μm.

Example 3 Production of Silicon Oxide-Boron Nitride Composite Particles: Average Particle Size 6
70 g of silicon oxide having a particle diameter of 1 μm and 30 g of boron nitride powder having an average particle diameter of 1 μm were mixed in an aqueous solution containing 1% of a nonionic surfactant. This suspension was sprayed at 110 ° C. through a pressure spray nozzle, and further fired at 400 to 500 ° C. to obtain silicon oxide-boron nitride composite particles having an average particle diameter of 6 μm.

Test Example 1 Measurement of regular reflectance: The regular reflectance of the composite particles obtained in Examples 1 to 3 was measured as follows. Table 1 shows the results. (Sample preparation method) 20 g of the powder is dispersed in 80 ml of polyethylene glycol, and 0.2 g of this is prepared on a preparation.
Apply with a thickness of 0.5 mm. Further, the powder was sprinkled from above to form a thin layer of the powder, which was used as a measurement sample. (Measurement Method) Using a phase difference measuring device NPDM-1000 (manufactured by Nikon Corporation), light having a wavelength of 500 nm was incident on the measurement sample at an angle of 45 °, and the intensity of reflected light was measured.

[0029]

As is clear from the above results, the specular reflectance of the composite particles of the present invention was as low as less than 0.5, and the feeling of glare was reduced. Further, the elongation and the adhesiveness were almost the same, and the advantages of the conventional boron nitride powder were not impaired.

Test Example 2 Feeling on use and cosmetic effect Powder foundations shown in Table 2 (Examples 4 to 4)
6 and Comparative Examples 1 to 5) were prepared, and sensory evaluation was performed on their feeling of use and cosmetic effect. The results are shown in Table 3.

(Powder foundation composition)

[Table 2]

(Production Method) A. Components 1 to 15 are mixed with a Henschel mixer. B. Ingredients 16 to 20 are dissolved by heating, and the resulting mixture is added to A and mixed. C. B was crushed and then press-molded to obtain a powder foundation.

(Sensory Evaluation Method) Each of 20 evaluation panels evaluated each item of touch, adhesion, elongation, no glare, and finished feeling using each powder foundation in the following 5 grades. The average score of the evaluation panel is 4.5 or more ◎, 3.5 or more to 4.5
A score of less than ◯ was evaluated as 2.5, and a score of 2.5 to less than 3.5 was evaluated as Δ, and a score of less than 2.5 was evaluated as x. 5 grades; 5 points: very good 4 points: good 3 points: normal 2 points: bad 1 point: very bad

[0035]

As is clear from the results shown in Table 3, the powder foundation of the present invention was excellent in all sensory evaluation items. On the other hand, it was not possible to satisfy all the evaluation items only with the boron nitride powder and the mother particles.

Example 7 White powder (pressed powder): A white powder was prepared according to the following formulation and manufacturing method. (Method) (%) 1. Composite particles (obtained in Example 1) 80 2. Tarq 5 3. Red iron oxide 0.2 4. Yellow iron oxide 0.5 5. Black iron oxide 0.05 6 . Microbe balance 7. Dimethylpolysiloxane 2 8. Liquid paraffin 3 9. Preservative proper amount 10. Fragrance proper amount

(Production Method) A. Components 1 to 6 are mixed with a Henschel mixer. B. Ingredients 7 to 10 are dissolved by heating, and the resulting mixture is added to A and mixed. C. B was crushed and then press-molded to obtain white powder. The white powder obtained in this example had a smooth texture, a smooth spread, and no unnatural glare.

Example 8 Cheek Color: A cheek color was prepared according to the following formulation and manufacturing method. (Method) (%) 1. Composite particle (obtained in Example 1) 30 2. Composite particle (obtained in Example 2) 30 3. Tarku 5 4. Red 226 No. 0.3 5 . Yellow iron oxide 0.1 6. Residual amount of micca 7. Liquid paraffin 8 8. 2-Ethylhexyl triglyceride 3 9. Preservative proper amount 10. Fragrance proper amount

(Production Method) A. Components 1 to 6 are mixed with a Henschel mixer. B. Ingredients 7 to 10 are dissolved by heating, and the resulting mixture is added to A and mixed. C. B was crushed and then press-molded to obtain a cheek color. The cheek color obtained in this example was smooth and had good adhesion.

Example 9 Eye Color: An eye color was prepared according to the following formulation and manufacturing method. (Processing) (%) 1. Composite particle (obtained in Example 1) 20 2. Composite particle (obtained in Example 2) 20 3. Composite particle (obtained in Example 3) 10 4 . Tarku 5 5. Mica Titanium 5 6. Blue No. 404 0.3 7. Yellow iron oxide 0.5 8. Microbe balance 9. Liquid paraffin 10 10. Dimethylpolysiloxane 3 11. Antiseptic suitable Amount 12. Perfume Suitable amount

(Production Method) A. Components 1 to 8 are mixed with a Henschel mixer. B. Ingredients 9 to 12 are dissolved by heating and added to A and mixed. C. B was crushed and then press-molded to obtain an eye color. The eye color obtained in this example was smooth and had good adhesion.

Example 10 Oily Compact Foundation: An oily compact foundation was prepared by the following formulation and manufacturing method. (Processing) (%) 1. Composite particles (obtained in Example 1) 10 2. Composite particles (obtained in Example 2) 5 3. Titanium oxide 15 4. Tark 8 5. Bengala 1 6. Yellow iron oxide 1.5 7. Black iron oxide 0.5 8. Liquid paraffin balance 9. Sorbitan sesquioleate 1 10. Dimethylpolysiloxane 10 11. Methylphenylpolysiloxane 15 12. Carnauba wax 1.5 13. Candelilla wax 3 14. Perfume proper amount

(Production Method) A. Components 1 to 7 are mixed. B. Components 8 to 14 are melted by heating, A is added to this, and the mixture is kneaded with a roller. C. B was melt-filled and solidified by cooling to obtain an oily compact foundation. The oily compact foundation obtained in this example had good spreadability and excellent natural finish.

Example 11 Emulsion (O / W) type foundation: An emulsion type foundation was prepared by the following formulation and manufacturing method. (Method) (%) 1. Stearic acid 1.5 2. Cetanol 1 3. Polyoxyethylene sorbitan monooleate (20 EO) 1 4. Sorbitan sesquioleate 1 5. Liquid paraffin 15 6. Glycerin 5 7. 1,3-Butylene glycol 5 8. Carboxyvinyl polymer 0.1 9. Carrageenan 0.05 05 Triethanolamine 0.8 11. Preservative proper amount 12. Refined water residual amount 13. Titanium oxide 8 14. Composite particles (obtained in Example 1) 5 15. Bengal 0.3 0.3 16. Yellow iron oxide 1 17. Black iron oxide 0.1 18. Fragrance suitable amount

(Production Method) A. Components 1 to 5 are dissolved by heating. B. Components 6 to 12 are dissolved by heating, A is added to this, and the mixture is emulsified and mixed, and then cooled. A mixture of C.B with components 13 to 17 and component 18 were added and mixed to obtain an emulsified (W / O) type foundation. The emulsion type foundation obtained in this example has good spreadability,
It had an excellent natural finish.

Example 12 Two-layer type foundation: A two-layer type foundation was prepared according to the following formulation and manufacturing method. (Method) (%) 1. Dimethyl siloxane methyl (polyoxyethyl) siloxane copolymer 2 2. Methyltetracyclosiloxane 10 3. 2-Ethylhexanoic acid triglyceride 5 4. Liquid paraffin 5 5. Sorbitan sesquioleate 0. 1 6. Polyoxyethylene sorbitan trioleate (20 EO) 0.1 7. Ethanol 10 8.1 1,3-Butylene glycol 5 9. Glycerin 5 10. Purified water balance 11. Composite particles (Examples) 5 12. Titanium oxide 7 13. Tark 3 14. Red iron oxide 0.2 15. Yellow iron oxide 2 16. Black iron oxide 0.3 17. Perfume proper amount

(Production Method) A. Components 1 to 6 are dissolved by heating. B. Components 7 to 10 are dissolved by heating, added to A, emulsified and mixed, and then cooled. A mixture of C.B with components 11 to 16 and component 17 were added and mixed to obtain a two-layer foundation. The two-layer foundation obtained in this example spread well and was excellent in a natural finish.

Example 13 Lipstick: Lipstick was prepared according to the following formulation and production method. (Method) (%) 1. Polyisobutylene 5 2. Ceresin wax 10 3. Candelilla wax 5 4. Carnauba wax 5 5. Glyceryl 2-ethylhexanoate 20 6. Diglycerin triisostearate 20 7. Vaseline 5 8 Castor oil Residual amount 9. Composite particles (obtained in Example 3) 5 10. Titanium oxide 0.5 11. Red 202 No. 3 12 12. Yellow No. 4 aluminum lake 1.5 13. Perfume proper amount

(Production Method) A. Components 1 to 8 are heated and dissolved, and a mixture of components 9 to 12 is added. B. Knead A with a roller. C. Heat B to add ingredient 13 and mix, fill in a container,
Cooled to obtain lipstick. The lipstick obtained in this example had a good spreadability and a good adhesion feeling, and had no unnatural glare.

Example 14 Eyeliner: An eyeliner was prepared according to the following formulation and production method. (Method) (%) 1. Stearic acid 2 2. Beeswax 3 3. Isopropyl myristate 3 4. Candelilla wax 5 5. Sorbitan sesquioleate 0.5 6. Polyoxyethylene sorbitan trioleate (20E.O) .) 1 7. Polymethacrylic acid emulsion 30 8. Triethanolamine 1.5 9.1,3-Butylene glycol 5 10. Preservative suitable amount 11. Purified water residual amount 12. Composite particles (in Example 2) Obtained) 5 13. Black iron oxide 10 14. Fragrance suitable amount

(Production Method) A. Components 1 to 6 are dissolved by heating. B. Components 7 to 11 are heated and dissolved, added to A, emulsified and mixed, and then cooled. Components 12 to 14 were added to C.B and mixed to obtain an eyeliner. The eyeliner of this example had good spreadability and good adhesion.

Example 15 Manicure: A manicure was prepared according to the following formulation and manufacturing method. (Method) (%) 1. Nitrocellulose 15 2. Alkyd oil and fat 10 3. Acrylic oil and fat 3 4. Acetyltributyl citrate 5 5. dl-camphor 1 6. Organic modified bentonite 1.5 7. Ethyl acetate 10 8. Butyl acetate 30 9. Toluene 20.4 10. Butanol 3 11. Composite particles (obtained in Example 1) 1 12. Red No. 202 0.1

(Production Method) A. Components 1 to 10 are mixed. B. Ingredients 11 to 12 were mixed and added to A, and uniformly mixed to obtain a nail polish. The nail polish obtained in this example had a good feeling of adhesion and spread, and formed a uniform film.

Example 16 Emulsion: An emulsion was prepared according to the following formulation and production method. (Method) (%) 1. Stearic acid 1 2. Cetanol 0.5 3. Polyoxyethylene sorbitan monooleate (20 EO) 0.5 4. Sorbitan sesquioleate 0.5 5. Liquid paraffin 5 6. 2-Ethylhexyl triglyceride 3 7.1 1,3-butylene glycol 10 8. Glycerin 5 9. Carboxyvinyl polymer 0.2 10. Triethanolamine 0.5 11. Preservatives proper amount 12. Purified water residual amount 13. Composite particles (obtained in Example 2) 1 14. Fragrance suitable amount

(Production Method) A. Components 1 to 6 are dissolved by heating. B. Components 7 to 12 are heated and dissolved, added to A, emulsified and mixed, and cooled. Components 13 and 14 were added to C.B and mixed to obtain an emulsion. The emulsion obtained in this example was smooth and had a good feeling of adhesion.

[0057]

INDUSTRIAL APPLICABILITY The composite particles obtained by coating the surface of the mother particle with the boron nitride powder according to the present invention are excellent in the spreadability and the feeling of adhesion and do not cause the glaring feeling that the conventional boron nitride powder has. It was a thing. Furthermore, the cosmetics containing the composite particles had a good feel on the skin, good adhesion and elongation, no unnatural glare, excellent finish of the cosmetic film, and excellent usability and cosmetic effect. that's all

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location C09C 3/06 PBS (72) Mamoru Ohno 3-3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Toray Co., Ltd. Osaka Plant (72) Inventor Yasuyuki Nakamura 3-3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture Toray Co., Ltd. Osaka Plant

Claims (8)

[Claims] 1. Composite particles in which the surface of the mother particle is directly coated with a boron nitride powder. 2. The composite particles according to claim 1, wherein the coating amount of the boron nitride powder on the mother particles is 5 to 70% by weight. 3. The composite particles according to claim 1, wherein the mother particles have an average particle diameter of 1 to 50 μm, and the boron nitride powder has an average particle diameter of 0.005 to 5 μm. 4. The regular reflectance is less than 0.5.
Item 7. The composite particle according to any one of items 3 to 3. 5. A cosmetic comprising the composite particle according to any one of claims 1 to 4. 6. The cosmetic according to claim 5, which contains 1 to 80% by weight of the composite particles. 7. The bond between the organic particles and the boron nitride powder is strengthened by forcibly applying a physical force after the boron nitride powder is attached to the surface of the organic particles by electrostatic force. Item 1. A method for producing composite particles according to item 1. 8. The method for producing composite particles according to claim 1, wherein a suspension containing inorganic particles, boron nitride powder and a dispersant is sprayed, dried, and then calcined.