JPH05301810A - Resin powder and cosmetic - Google Patents

Abstract

PURPOSE:To obtain resin powder, excellent in feeling of use and dispersibility without any creakiness and stickiness and having high ultraviolet ray absorbency. CONSTITUTION:The objective resin powder comprises resin powder prepared by coating the surface of a resin with a flaky zinc oxide having 0.1-1mum average grain diameter, 0.01-0.2mum average grain thickness and >=3 average flakiness ratio and the objective cosmetic comprises the resin powder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic which has a good feeling in use and dispersibility, has an excellent ability to absorb ultraviolet rays, and protects the skin from ultraviolet rays.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
Zinc oxide is used as a white pigment in cosmetics,
Zinc oxide in the form of fine particles is applied as an ultraviolet absorber, particularly an absorber in the UV-A region, and a composite powder coated with the fine particle zinc oxide is also found. However, these powders have a problem of feeling such as squeaky feeling, dispersibility in the compounding system, and when the compounding amount is increased to improve the effect, it becomes white and the natural finish feeling is impaired. There was a problem with feeling and UV absorption.

[0003]

Means for Solving the Problems As a result of intensive studies to solve the above problems of conventional zinc oxide, the present inventors have found that the average particle diameter is 0.1 to 1 μm and the average particle thickness is 0.01 to 0.2.
It has been found that the above-mentioned problems can be solved by blending a resin powder whose surface is covered with flaky zinc oxide having an average plate-like ratio of 3 or more, and the present invention has been completed. That is, in the present invention, the surface of the resin powder has an average particle size of 0.1 to 1
Resin powder characterized by being coated with flaky zinc oxide having an average particle thickness of 0.01 to 0.2 μm and an average plate ratio of 3 or more, and a makeup characterized by containing the resin powder. To provide a fee.

In the present specification, the average particle diameter, average particle thickness and average plate-like ratio are values measured by the methods shown in the following examples.

The flaky zinc oxide used in the present invention can be produced, for example, by the following method. That is, in the case of directly producing zinc oxide from an aqueous solution containing a salt of zinc, (a) zinc ions are contained, and (b) a total amount of one or more acid groups exceeding the equivalent amount is added to the zinc ions. It is a method of forming a precipitate from a mother liquor containing and c) a pH of 11 or more. In such a method, when the zinc ion is reacted with the alkaline solution, it is preferable to carry out a mixed reaction at a reaction temperature of 60 ° C. or lower, preferably at a reaction temperature of 40 ° C. or lower under strong stirring within a short time.
Examples of the acid group to coexist include NO ₃ ⁻ , SO ₄ ²⁻ , CH
One or more kinds of ₃ COO ⁻ , Cl ⁻ , PO ₄ ³⁻ , CO ₃ ²⁻ , C ₂ O ₄ ^{2− and the} like can be mentioned. In the mother liquor, these acid groups are present in an amount exceeding the equivalent amount to zinc ions, and the pH is
Must be 11 or higher. Particularly, the pH is preferably 12 or more. Furthermore, after the precipitate is formed, the white slurry is mixed with 60-
By heating to a temperature of 100 ° C., preferably 90 to 100 ° C. and maintaining the temperature for 10 minutes or longer, preferably 30 minutes or longer, flaky zinc oxide having better crystallinity can be obtained.

In the above-mentioned method, when the amount of the acid groups with respect to zinc ions is equal to or less than the equivalent, it is easy to obtain zinc oxide which is flaky but has solidified crystals as a main component, and the flaky particles used in the present invention are obtained. It is not preferable because the control for obtaining it is extremely difficult. Further, there is no particular upper limit on the amount of acid groups,
If the amount of zinc ion is excessively large relative to the amount of zinc ion, washing is troublesome during isolation, which is not practical. Depending on the type of acid group ion, 1.05 to 2 equivalents with respect to zinc ion are likely to produce preferable results. Further, if the pH is less than 11, zinc hydroxide is produced or the shape becomes granular to granular rice, so that the flaky zinc oxide used in the present invention cannot be obtained in such a pH range.

In the above method, when the reaction temperature is higher than 60 ° C., flaky crystals are not obtained even if the pH is 11 or more, and spherical or lump crystals are the main components, which is not preferable. However, when the white slurry of flaky crystals obtained by the reaction at a reaction temperature lower than 60 ° C is heated at 60 ° C or higher, the crystallinity can be improved while maintaining this shape by powder X-ray diffraction measurement. It was confirmed from the result. Further, when it is isolated as a powder, it is filtered and washed, but by performing the washing with a water-soluble organic solvent as the final step, the subsequent drying and pulverizing operations become easy. This is particularly effective when it is desired to increase the bulk specific volume.

In the above method, the acid group moiety exceeding the equivalent amount with respect to zinc ions may be added as a salt or acid in the zinc salt solution or in the alkaline solution. The salt may be any water-soluble salt, and specifically, sodium sulfate, sodium nitrate, sodium chloride, sodium acetate, potassium sulfate, sodium phosphate, sodium oxalate, sodium carbonate or the like can be used. As the alkali, sodium hydroxide, potassium hydroxide, lithium hydroxide, ammonium hydroxide or the like can be used. As a method for adding the zinc salt aqueous solution and the alkali, the alkali may be injected into the zinc salt or dropped, or vice versa, or both may be simultaneously injected into water or the salt solution and dropped.

It was confirmed by powder X-ray diffraction that the flaky zinc oxide obtained as described above exhibits crystallinity. This product has a very large bulk specific volume due to its particle morphology, and can have a surprising bulk specific volume which is several times to several tens of times that of general vapor phase zinc oxide. Further, according to UV spectrum measurement, the obtained flaky zinc oxide has a higher ultraviolet absorption capacity than commercially available zinc oxide, and on the contrary, a small visible light absorption, which is characteristic of a highly transparent ultraviolet absorber. It showed some behavior.

In the present invention, as the resin powder (hereinafter referred to as mother particles) whose surface is coated with the above flaky zinc oxide, nylon resin, polyethylene resin, polyester resin, silicone resin, polystyrene resin, epoxy resin, etc. Resin powder of. Among them, silicone resin is preferable because it is excellent in mechanical deformation and heat generated at the time of compounding described later. Preferred examples of the silicone resin include polymethylsilsesquioxane powder. The shape of these mother particles is preferably spherical, but may be rod-like, plate-like, or porous or non-porous. The average particle size is preferably 0.1 to 500 μm, particularly preferably 0.2.
It should be in the range of ~ 50 μm. As the polymethylsilsesquioxane powder, specifically, Toshiba Silicone Co., Ltd. Tospearl 103 (particle size 0.3 μm), Tospearl 105 (particle size 0.5 μm), Tospearl 108 (particle size 0.8 μm), Tospearl 120 (particle size 2.0 μm), Tospearl 130 (particle size 3.0 μ
m), Tospearl 145 (particle size 4.5 μm), Tospearl 3120 (particle size 12.0 μm), Tospearl 240 (particle size 4.0 μm), and Toray Dow Corning's Trefil E-500 (particle size 3 μm
m), Trefil E-501 (particle size 10 μm), Trefil E-60
0 (particle size 5 μm), trefil E-601 (particle size 5 μm), trefil E-602 (particle size 5 μm), trefil E-603 (particle size 5 μm
m), Trefil R-900 (particle size 20 μm), Trefil R-92
5 (particle size 0.5 μm), Trefil R-930 (particle size 1 μm) and the like.

In order to produce the resin powder of the present invention, the flaky zinc oxide is prepared and mixed preferably in an amount of 2 to 1000% by weight, particularly preferably 10 to 500% by weight, based on the mother particles. As a device, a hybridizer (hybridization system), various ball mills, an Ong mill (mechanophasion system), or the like is used for compounding. What is Hybridizer? Journal of Powder Engineering, vol. 24 , N
O.9, 25-31 (1987) is a device used in the high-speed air impact method described, composited by this method, since the shape of flaky zinc oxide is maintained, The dispersibility in the compounding system is particularly good. As a hybridizer, the Nara Hybridization System (N
HS-1, manufactured by Nara Machinery Co., Ltd. can be used.

The cosmetic of the present invention contains the resin powder coated with the flaky zinc oxide obtained as described above, and the amount of the flaky zinc oxide-coated resin powder incorporated into the cosmetic is Preferably 0.1 to 50% by weight, particularly preferably 1 to
25% by weight.

The cosmetic of the present invention is a cosmetic commonly used with the above-mentioned flaky zinc oxide-coated resin powder,
It can be obtained by mixing bases such as external medicines by a conventional method. Among the bases that can be used, powders include extenders such as mica, talc, sericite, kaolin, and nylon powders, inorganic pigments such as titanium oxide, zinc white, iron oxide, and pearls, red 202, red 226, yellow 4 Organic pigments such as aluminum lake are used. Also, powders which have been subjected to known surface hydrophobic treatment such as silicone treatment, metal soap treatment, N-acyl glutamic acid treatment and the like can be used. Oils include hydrocarbons such as solid or liquid paraffin, crystal oil, ceresin, ozokerite, and montan wax; vegetable oil such as olive, ground wax, carnauba wax, lanolin, whale wax, and animal oil and wax; and stearic acid ,
Fatty acids and their esters such as palmitic acid, oleic acid, glycerin monostearate, glyceryl distearate, isopropyl myristate, isopropyl stearate, butyl stearate; dextrin fatty acid ester; methyl polysiloxane, methyl phenyl poly Siloxane,
Silicone oils such as octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane; alcohols such as ethyl alcohol, isopropyl alcohol, cetyl alcohol, stearyl alcohol, palmityl alcohol, hexyldecyl alcohol, and the like. Polyhydric alcohols having a moisturizing action such as glycol, glycerin and sorbitol can also be used. Also, conventionally used surfactants and silicone-containing surfactants can be used.

Furthermore, known UV absorbers may be combined and blended. Examples of such UV absorbers include p-methylbenzylidene, D, L-camphor or its sulfonic acid sodium salt, 2-phenylbenzimidazole-5-sulfonic acid sodium salt, 3,4-
Dimethylphenylglyoxylic acid sodium salt, 4-phenylbenzophenone, 4-phenylbenzophenone-
2'-carboxylic acid isooctyl ester, p-methoxycinnamic acid ester, 2-phenyl-5-methylbenzoxazole, p-dimethylaminobenzoic acid esters, 4-
Examples thereof include tert-butyl-4′-methoxydibenzoylmethane, benzoylpinacolone derivative, and benzoylketone derivative. Further, thickeners, preservatives, antioxidants and the like which are usually used in external preparations can be added.

The cosmetic composition of the present invention can be used in the form of emulsion, cream, oil, oily solid and the like. Since it has an excellent ability to absorb ultraviolet rays, it can be used as a sunscreen, UV care, and as a pigment. When used together, it can be used as a UV care foundation or the like.

[0016]

[Examples] The present invention will be described in more detail with reference to specific synthetic examples of flaky zinc oxide, production examples of resin powders, and examples of cosmetics. It is not limited to the example. Incidentally, here, the average particle diameter,
The average particle thickness and average plate ratio were measured by the following methods. <Measurement method of average particle diameter, average particle thickness, average plate ratio>
The average particle diameter was determined by repeatedly measuring the volume average of 20 particles in an arbitrary visual field in a transmission electron micrograph. For oblong particles, the arithmetic mean of the long axis and the short axis was regarded as the particle size. Further, the average plate-like ratio is the average particle thickness obtained by the arithmetic mean of all particles capable of reading the plate thickness in the same field of view of the transmission electron micrograph,
The average particle diameter / average particle thickness was rounded to the nearest whole number.

Synthesis Example 1 Flake-shaped zinc oxide was synthesized according to the method of Synthesis Example 1 described in JP-A-1-175921. That is, 300 g of a 2 molal concentration solution of zinc nitrate and 20 g of sodium sulfate were added to 1 liter of ion-exchanged water and kept at 30 ° C. under strong stirring with 2N-NaOH.
700 g was added. The pH immediately after the addition was 12.3. The slurry was aged for 30 minutes as it was, then heated at 100 ° C. for 1 hour, and then filtered and washed. The obtained wet cake was allowed to stand and dry at 110 ° C. until a constant weight was obtained, and pulverized to obtain a white powder. This product was identified by powder X-ray diffraction by a conventional method (measured using Cuk α-ray using Rotaflex PL200 manufactured by Rigaku Denki) and confirmed to be zinc oxide. In addition, when the shape was observed with a scanning electron microscope (SEM), it was confirmed that the powder was a powder containing, as a main component, independent flaky particles having a particle diameter of 1 μm or less without solidification.

Synthetic Examples 2 to 7 Flaky zinc oxide was synthesized according to the methods of Synthetic Examples 2 to 7 described in JP-A-1-175921. That is, instead of zinc nitrate in Synthesis Example 1, zinc acetate was used (Synthesis Example 2), and the amount of sodium sulfate in Synthesis Example 1 was halved (Synthesis Example 3). (Synthesis example 4), one obtained by doubling the zinc ion concentration of the system in synthesis example 1 (synthesis example 5), one using sodium chloride instead of sodium sulfate (synthesis example 6), and 400 ml of ion-exchanged water to be added.
Then, the one in which 2N-NaOH was changed to 680 g (Synthesis Example 7) and the like were examined to obtain the same flaky zinc oxide powder.

Table 1 shows the measurement results of the average particle size, average plate-like ratio, UV absorption capacity and apparent bulk specific volume of the flaky zinc oxide powders obtained in Synthesis Examples 1 to 7.

[0020]

[Table 1]

Production Example 1 (Production of flaky zinc oxide-coated silicone resin powder) 15 g of the flaky zinc oxide of Synthesis Example 3 and 15 g of Tospearl 145 having an average particle size of 4.5 μm were mixed with a rotating blade at 1000 rp as pre-mixing.
m 2 for 1 minute, then charged into a hybridizer having a capacity of 50 g, and treated at a peripheral speed of 74 m / s for 3 minutes. It was confirmed by electron microscope observation that the obtained powder was a powder in which flaky zinc oxide was adhered to the surface of Tospearl 145 and was completely covered.

Production Example 2 (Production of flaky zinc oxide-coated crosslinked polystyrene resin powder) 15 g of flaky zinc oxide of Synthesis Example 3 and an average particle size of 4.5 to 7.5.
When 15 g of the crosslinked polystyrene resin powder of μm was treated in the same manner as in Production Example 1 and observed by an electron microscope, it was found that the powder was completely covered with flaky zinc oxide on the surface of the crosslinked polystyrene resin powder. confirmed.

Production Example 3 (Production of flaky zinc oxide-coated nylon resin powder) 15 g of flaky zinc oxide of Synthesis Example 3 and 15 g of nylon (SP 500) resin powder having an average particle size of 5.0 μm were treated in the same manner as in Production Example 1. Then, an electron microscope observation was conducted, and it was confirmed that the flaky zinc oxide was attached to the surface of the nylon resin powder and was completely covered.

Production Example 4 (Production of flaky zinc oxide-coated silicone resin powder) According to the method of Production Example 1, flaky zinc oxide of Synthesis Example 1.
Using 7 g and 15 g of Tospearl 145 having an average particle diameter of 4.5 μm, flaky zinc oxide-coated silicone resin powder was obtained. As a result of electron microscope observation, it was confirmed that the powder was flaky zinc oxide adhered to the surface of the silicone resin powder.

Production Example 5 (Production of flaky zinc oxide-coated silicone resin powder) According to the method of Production Example 1, flaky zinc oxide of Synthesis Example 3.
Using 8 g and 15 g of Tospearl 145 having an average particle size of 4.5 μm, flaky zinc oxide-coated silicone resin powder was obtained. As a result of electron microscope observation, it was confirmed that the powder was flaky zinc oxide adhered to the surface of the silicone resin powder.

Production Example 6 (Production of flaky zinc oxide-coated silicone resin powder) According to the method of Production Example 1, flaky zinc oxide of Synthesis Example 1 15
g, and 15 g of Tospearl 145 having an average particle diameter of 4.5 μm, flaky zinc oxide-coated silicone resin powder was obtained.

Production Example 7 (Production of flaky zinc oxide-coated silicone resin powder) According to the method of Production Example 1, flaky zinc oxide of Synthesis Example 3 15
g and Tospearl 3120 15 g having an average particle diameter of 12.0 μm were used to obtain flaky zinc oxide-coated silicone resin powder.

Production Example 8 (Production of Fine Particle Zinc Oxide-Coated Silicone Resin Powder) According to the method of Production Example 1, 0.1 μm of fine particle zinc oxide 15
g and 15 g of Tospearl 145 having an average particle diameter of 4.5 μm were used to obtain fine particle zinc oxide-coated silicone resin powder.

Production Example 9 (Production of Fine Particle Zinc Oxide Coated Nylon Resin Powder) According to the method of Production Example 1, 0.1 μm of fine particle zinc oxide 15
and nylon (SP 500) resin powder with an average particle size of 5.0 μm
Using 15 g, a fine particle zinc oxide-coated nylon resin powder was obtained.

Example 1 Emulsions were prepared according to the formulations of the products 1 to 5 of the present invention and the comparative products 1 to 4 shown in Tables 2 and 3, and the following feelings were used to compare the feeling of use regarding stains and stickiness. The dispersibility was also evaluated. The results are shown in Tables 2 and 3. It can be seen from Tables 2 and 3 that all the products of the present invention are excellent in usability and dispersibility. <Evaluation criteria of usability> Out of 15 professional panelists ◎: 15 to 12 people who answered that they are good ○: 11 to 8 people who answered that they are good △: 7 to 4 people who answered that they are good ×: Answered that they are good Less than 3 people

[0031]

[Table 2]

[0032]

[Table 3]

Example 2 (Emulsion) When an emulsion having the following composition was prepared, it was confirmed that it was excellent in the feeling of use and the ability to protect against ultraviolet rays.

(1) Flake-shaped zinc oxide-coated silicone resin powder of Production Example 1 (20% by weight) (2) Silicone-treated talc 5 (3) α-monoisostearyl glyceryl ether 1.5 (4) Octyl p-methoxycinnamate 5 (5) Polyoxyethylene (EO20) sorbitan monooleate 1.0 (6) Beeswax 2.0 (7) Lanolin 2.0 (8) Squalane 10 (9) Liquid paraffin 10 (10) Preservatives Appropriate amount (11) Fragrance Trace ( 12) Purified water balance Example 3 (milky lotion) When a milky lotion having the following composition was prepared, it was confirmed that it was excellent in the feeling of use and the ultraviolet protection ability.

(1) Flaky Zinc Oxide-Coated Silicone Resin Powder of Production Example 10 (wt%) (2) Flaky Zinc Oxide with Average Particle Size 0.5 μm and Average Plate Ratio 9 (3) Silicone Treated Talc 5 (4) α-Monoisostearyl glyceryl ether 1.5 (5) Polyoxyethylene (EO20) Sorbitan monooleate 1.0 (6) Beeswax 2.0 (7) Lanolin 2.0 (8) Squalane 10 (9) Liquid paraffin 10 (10) Preservative: Appropriate amount (11) Fragrance: Trace amount (12) Purified water balance Example 4 (Emulsion) When an emulsion having the following composition was prepared, it was confirmed that it was excellent in the feeling of use and the ultraviolet protection ability.

(1) Flake-shaped zinc oxide-coated cross-linked polystyrene resin powder of Production Example 2 (20% by weight) (2) Silicone-treated talc 5 (3) α-monoisostearyl glyceryl ether 1.5 (4) p-dimethoxybenzoic acid Octyl 5 (5) Polyoxyethylene (EO20) Sorbitan monooleate 1.0 (6) Beeswax 2.0 (7) Lanolin 2.0 (8) Squalane 10 (9) Liquid paraffin 10 (10) Preservative Appropriate amount (11) Perfume Trace amount (12) Purified water balance Example 5 (milky lotion) When a milky lotion having the following composition was prepared, it was confirmed that it was excellent in the feeling of use and the ultraviolet protection ability.

(1) Nylon resin powder coated with flaky zinc oxide of Production Example 3 10 (% by weight) (2) α-monomethyl branched isostearyl glyceryl ether 1.5 (3) Polyoxyethylene (EO20) sorbitan monooleate 1.5 (4) Beeswax 2.0 (5) Lanolin 2.0 (6) Squalane 10.0 (7) Liquid paraffin 10.0 (8) Preservative proper amount (9) Fragrance trace amount (10) Purified water balance Example 6 (milky lotion) When it was prepared, it was confirmed that it was excellent in the feeling of use and the ability to protect against ultraviolet rays.

(1) Flake-shaped zinc oxide-coated silicone resin powder 15 of Production Example 6 (% by weight) (2) α-monomethyl branched isostearyl glyceryl ether 1.5 (3) Polyoxyethylene (EO20) sorbitan monooleate 1.5 (4) Lanolin 4.0 (5) Squalane 5.0 (6) Liquid paraffin 15.0 (7) Preservative proper amount (8) Fragrance slight amount (9) Purified water balance Example 7 (Cream) A cream of the following composition was prepared and used. It was recognized that it was excellent in feeling and ultraviolet protection.

(1) Flake-shaped zinc oxide-coated silicone resin powder of Production Example 1 (20% by weight) (2) Silicone-treated fine particle titanium oxide (30 to 70 nm) 1 (3) Octyl methoxycinnamate 5 (4) α- Monomethyl branched isostearyl glyceryl ether 2 (5) Polyoxyethylene (EO20) sorbitan monolaurate 2 (6) Beeswax 5 (7) Lanolin 8 (8) Squalane 35 (9) Myristyl octyldodecyl 1 (10) Magnesium sulfate 0.5 ( 11) Glycerin 5 (12) Preservatives Appropriate amount (13) Perfume Trace amount (14) Purified water balance Example 8 (Cream) A cream having the following composition was prepared, and it was confirmed that it has excellent feeling in use and UV protection ability. Was given.

(1) Flake-shaped zinc oxide-coated silicone resin powder of Production Example 16 (% by weight) (2) Beeswax 5.5 (3) Cetanol 4.5 (4) Hydrogenated lanolin 7 (5) Squalane 33 (6) Fatty acid glycerin 3.5 (7) Lipophilic glyceryl monostearate 2 (8) Polyoxyethylene (EO20) Sorbitan monolaurate 2 (9) Fragrance (10) Preservative proper amount (11) Antioxidant proper amount (12) Propylene glycol 4.5 (13) Purified water balance Example 9 (Cream) When a cream having the following composition was prepared, it was confirmed that it was excellent in feeling of use and UV protection ability.

(1) Flake-shaped zinc oxide-coated silicone resin powder of Production Example 7 (20% by weight) (2) Beeswax 5 (3) Cetanol 5 (4) Hydrogenated lanolin 7 (5) Squalane 33 (6) Fatty acid glycerin 3.5 (7) Lipophilic glyceryl monostearate 2 (8) Polyoxyethylene (EO20) Sorbitan monolaurate 2 (9) Propylene glycol 4.5 (10) Preservative proper amount (11) Antioxidant proper amount (12) Fragrance Trace amount (13) Purified water balance Example 10 (Liquid foundation) When a liquid foundation having the following composition was prepared, it was confirmed that it was excellent in the feeling of use and the ability to prevent ultraviolet rays.

(1) Dimethylpolysiloxane polyoxyalkylene copolymer (water-insoluble) 0.5 (wt%) (2) Octamethylcyclotetrasiloxane (Toray Silicone SH244) 15 (3) Decamethylcyclopentasiloxane (Toray Silicone SH245 ) 5 (4) Dimethyl polysiloxane (Toray Silicone SH200 (20cs)) 10 (5) Flake-shaped zinc oxide-coated silicone resin powder of Production Example 1 20 (6) Ethyl alcohol / water = 20/80 (w / w%) Balance (7) Preservative Appropriate amount (8) Perfume Trace amount

[0043]

EFFECT OF THE INVENTION The resin powder of the present invention and the cosmetics containing the same have excellent usability and dispersibility without squeezing and stickiness, and have high ultraviolet absorption ability.

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[Procedure amendment]

[Submission date] June 12, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

It was confirmed by powder X-ray diffraction that the flaky zinc oxide obtained as described above exhibits crystallinity. This product has a very large bulk specific volume due to its particle morphology, and can have a surprising bulk specific volume which is several times to several tens of times that of general vapor phase zinc oxide. Further, according to UV spectrum measurement, the obtained flaky zinc oxide has a higher ultraviolet absorption capacity than commercially available zinc oxide, and on the contrary, a small visible light absorption, which is characteristic of a highly transparent ultraviolet absorber. It showed some behavior. Flaky zinc oxide according to the present invention
Water-repellent treatment such as silicone treatment if necessary
You can also

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

In the present invention, as the resin powder (hereinafter referred to as mother particles) whose surface is coated with the above flaky zinc oxide, nylon resin, polyethylene resin, polyester resin, silicone resin, polystyrene resin, epoxy resin, etc. Resin powder of. Among them, silicone resin is preferable because it is excellent in mechanical deformation and heat generated at the time of compounding described later. The silicone resin is preferably polymethylsilsesquioxane powder or methyl ester.
And the like . The shape of these mother particles is preferably spherical, but may be rod-like, plate-like, or porous or non-porous. Average particle size 0.1-500 μm
Is preferable, and the range of 0.2 to 50 μm is particularly preferable. As the polymethylsilsesquioxane powder, specifically, Tospearl 103 (particle size 0.3 μm), Tospearl 105 (particle size 0.5 μm) manufactured by Toshiba Silicone Co.,
Tospearl 108 (particle size 0.8 μm), Tospearl 120 (particle size 2.0
, Tospearl 130 (particle size 3.0 μm), Tospearl 145 (particle size 4.5 μm), Tospearl 3120 (particle size 12.0 μm), Tospearl 240 (particle size 4.0 μm), etc.
As the powder, Toray Dow Corning Co., Ltd. trefil E-500 (particle size 3 μm), trefil E-501 (particle size 1
0 μm), Trefil E-600 (particle size 5 μm), Trefil E
-601 (particle size 5 μm), Trefil E-602 (particle size 5 μm), Trefil E-603 (particle size 5 μm), Trefil R-900 (particle size 2
0 μm), trefil R-925 (particle size 0.5 μm), trefil
R-930 (particle size 1 μm) and the like can be mentioned.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

In order to produce the resin powder of the present invention, the flaky zinc oxide is prepared and mixed preferably in an amount of 2 to 1000% by weight, particularly preferably 10 to 500% by weight, based on the mother particles. hybridizer as apparatus (hybridization system), complexing with various ball mill, angmill (Mechano Fusion system) or the like. What is Hybridizer? Journal of Powder Engineering, vol. 24 , N
O.9, 25-31 (1987) is a device used in the high-speed air impact method described, composited by this method, since the shape of flaky zinc oxide is maintained, The dispersibility in the compounding system is particularly good. As a hybridizer, the Nara Hybridization System (N
HS-1, manufactured by Nara Machinery Co., Ltd. can be used.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Production Example 1 (Production of flaky zinc oxide-coated silicone resin powder) The flaky zinc oxide of Synthesis Example 3 was treated with silicone.
The 15g of the average Tospearl 145 15g of the particle diameter of 4.5 [mu] m,
As pre-mixing, processing with a rotary blade at 1000 rpm for 1 minute, then
Charged into a hybridizer with a capacity of 50 g, peripheral speed 74 m / s,
The treatment was performed for 3 minutes. The powder obtained is Tospearl 145.
It was confirmed by electron microscope observation that the powder was completely covered with flaky zinc oxide on the surface of the powder.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Production Example 2 (Production of flaky zinc oxide-coated crosslinked polystyrene resin powder) The flaky zinc oxide of Synthesis Example 3 was treated with silicone.
And 15 g of a crosslinked polystyrene resin powder having an average particle size of 4.5 to 7.5 μm were treated in the same manner as in Production Example 1 and observed under an electron microscope. As a result, flaky zinc oxide adhered to the surface of the crosslinked polystyrene resin powder and was completely removed. It was confirmed that the powder was covered.

Claims (2)

[Claims] 1. An average particle size of 0.1 to 1 on the surface of the resin powder.
A resin powder characterized in that it is coated with flaky zinc oxide having an average particle thickness of 0.01 to 0.2 μm and an average plate ratio of 3 or more. 2. A cosmetic comprising the resin powder according to claim 1.