JPH03181584A - Ultraviolet light-screening powder and cosmetic blended with same powder - Google Patents

Abstract

PURPOSE:To obtain the title novel powder having high ultraviolet light-screening effects and excellent feeing in use and utility, comprising pressure-degradable spherical powder having adsorbad an ultraviolet light absorbers. CONSTITUTION:The objective powder comprising pressure-degradable spherical powder having adsorbed 1-60wt.% (preferably 3-40wt.%) ultraviolet light absorber composed of 2-ethylhexyl-pdimethylaminobenzoate or 4-t-butyl-4'- mathoxydibenzoylmethane and 1-100mum average aggregated particle diameter. Pressuredegradable spherical powder prepared by spray-drying a slurried material dispersing powder for cosmetic and an inorganic colloidal solution in a dispersion medium is preferable as the pressure-degradable spherical powder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a novel UV-shielding powder that has a high UV-shielding effect and is excellent in feel and usability, and a cosmetic containing the same.

[Problems to be solved by conventional techniques and inventions] Conventionally,
In order to protect the skin from ultraviolet rays, ultraviolet scattering agents and ultraviolet absorbers are incorporated into sun-cut cosmetics and makeup cosmetics.

As the ultraviolet scattering agent, inorganic pigments such as finely divided titanium oxide and finely divided zinc oxide are used. These have excellent UV-shielding effects and are suitable for achieving transparency and a natural finish, but cosmetics containing them do not spread easily on the skin, and they are also solid powder cosmetics. In the case of coating materials, there are problems in that a caking phenomenon occurs during use, and the transferability to the coated body deteriorates, making it unusable.

Therefore, attempts have been made to solve the above-mentioned problems by surface-treating the fine-particle inorganic pigment with metal soap or the like, making it spherical, or forming it into a plate. However, although these methods have made some improvements, they are still not sufficient, and there is a problem in that the adhesion, naturalness, ultraviolet shielding effect, etc. of the decorative finishing film are impaired.

On the other hand, when adding UV absorbers in large quantities to increase the UV shielding effect, if the UV absorbers are in liquid form, they may become oily or sticky, causing problems with the texture. It is difficult to obtain a good dispersion state in a system containing a large amount of body, and solid powder cosmetics have problems such as caking.

In addition, a method has been proposed in which the use of spherical porous resin powder with ultraviolet absorbers dispersed therein reduces skin irritation and provides a soft feeling of use.
2-51931), it was not satisfactory in terms of uniformity of spreading on the desk, ultraviolet absorption effect, etc.

Therefore, the cosmetics have good transferability to the application body, good spreadability and adhesion to the skin, and form a cosmetic film with a uniform adhesion and good finish after makeup, and have an excellent ultraviolet shielding effect. It would be desirable to provide a UV-shielding powder for formulation.

[Means to solve the problem]

Under these circumstances, the present inventors have conducted intensive research and have found that the above problems can be solved by incorporating pressurized collapsible spherical powder adsorbed with an ultraviolet absorber into cosmetics as an ultraviolet shielding powder. The present invention has been completed.

That is, the present invention provides a UV-shielding powder made of a pressure-disintegrable spherical powder to which a UV absorber is attached, and a cosmetic containing the same.

As the ultraviolet absorber used in the present invention, for example, 2-
Ethyl hekyl para dimethylaminobenzoate,
Aminobenzoates such as amyl-para-dimethylaminobenzoate, glyceryl-vara-aminobenzoate, ethyl-vara-dimethylaminobenzoate, ethyl-vara-diethylaminobenzoate, glyceryl-mono-vara-aminobenzoate; 2,4-dihydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-5 - Benzophenones such as sulfobenzophenone: 2-ethoxyshetyl-valarmethoxycinnamate), 2,2'-bis(vara-methoxystyryl)-dithyl-para-methoxycinnamate, methyl-2,5-diisopropylcinnamate, etc. Cinnamate series; rose t-butyl salicylate, rose octylphenyl salicylate, dipropylene glycol salicylate, phenyl salicylate,
Salicylates such as rose-t-butylphenyl salicylate: 4-methoxy-4'-t-butyldibenzoylmethane, 2゜4-dimethyl-4'-methoxydibenzoylmethane, 4-isopropyldibenzoylmethane, etc. Dibenzoylmethane type; 2-(2'-hydroxy-5'-
methylphenyl)benzotriazole, 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)
-IJ azole series such as -5-chlorobenzotriazole; any conventionally known ones such as imidazole series such as urocanic acid and ethyl urocanate can be used, and one or more of these can be selected and used. can.

The pressure-disintegrable spherical powder used in the present invention refers to a spherical composite powder obtained by agglomerating cosmetic powder, which is broken by pressure and becomes fine powder.

The granulation method for pressurized collapsible spherical powder includes spray drying method,
Fluidized bed granulation method etc. can be applied to adjust the hardness of granules.
An inorganic colloid liquid, a water-soluble polymer, etc. can be used as the binder.

The powder for cosmetics used in the production of the pressurized disintegrating spherical powder is not particularly limited as long as it is commonly used in cosmetics, such as white pigments such as titanium oxide and zinc oxide; yellow iron oxide, red iron oxide, etc. Coloring pigments such as , black iron oxide, ultramarine blue, navy blue, tar pigments, natural pigments; Extender pigments such as talc, mica, sericite, calcium carbonate, magnesium carbonate, silica, alumina, kaolin; mica titanium, bismuth oxychloride, etc. Bright pigments; examples include organic powders such as nylon, polystyrene, polymethyl methacrylate, crystalline cellulose, and starch. It is preferable that the average particle diameter of these powders for chemical conversion is in the range of 0.001 to 50 μm.

Further, as the inorganic colloid liquid, for example, an aqueous sol of silica, alumina, titania, zirconia, etc. is used.

The dispersed colloid particle size is 50 to 1000, especially 100 to 1000.
A range of 300 people is preferred. If the number of particles is less than 50, it is difficult to obtain, and if the number of particles is more than 1,000, the binding force of the particles is weak and the particles are too easily disintegrated, which is not preferable. Commercially available products include, for example, Applied AT (manufactured by Jimikasha Co., Ltd.), Lu
dox H340 (manufactured by DuPont), neo sun veil (
(manufactured by Catalysts Kasei Co., Ltd.), alumina clear sol (manufactured by Yoken Fine Chemical Co., Ltd.), and the like.

In addition, examples of water-soluble polymers include methyl cellulose,
Carboxymethyl cellulose, polyvinyl alcohol, etc. are used.

In the present invention, the pressurized collapsible spherical powder obtained by spray-drying a slurry in which cosmetic powder and inorganic colloid liquid are dispersed in a dispersion medium is particularly used in order to provide appropriate particle strength. preferable.

The average agglomerated particle size of the pressure-disintegrable spherical powder is 1 to 100 μm
It is preferable that it is in the range of . If it is less than 1 μm, it is difficult to prepare, and if it is too small, it is difficult to exhibit the characteristics of a spherical powder, and if it exceeds 100 μm, it becomes undesirable because it gives a grainy feel.

Further, the pressure disintegration property of the pressure disintegration spherical powder of the present invention is determined as shear fracture strength from the degree of change in frictional resistance value with respect to load using, for example, a Hayton surface property measuring machine, from 10 to 10.
It is preferably within the range of 260 g/cd. That is, within this range, the particles will easily disintegrate when a cosmetic containing the particles is rubbed, and a fine cosmetic film with excellent adhesion can be obtained without any residual air such as graininess or discomfort. Shear fracture strength is 10g/cI! ! If it is less than 260 g/cff!, the mechanical strength will be low, and particles will break during the mixing, crushing, pressing, etc. processes during the production of cosmetics.
If it exceeds this value, the friction strength becomes too high and the particles do not disintegrate under the application pressure, making it impossible to achieve the object of the present invention.

In the present invention, examples of the method for adsorbing the ultraviolet absorber to the pressurized collapsible spherical powder include the following method.

■ A method in which pre-produced pressure-disintegrable spherical powder is impregnated with an ultraviolet absorber dissolved in a solvent, and then the solvent is removed.

■ A method in which the surface of cosmetic powder is treated with an ultraviolet absorber, dispersed in a dispersion medium, and then granulated.

■ A method in which cosmetic powder and ultraviolet absorber are dispersed in a dispersion medium and then granulated.

Here, the amount of the ultraviolet absorber to be used varies depending on the oil absorption amount of the cosmetic powder, etc., and cannot be unconditionally specified, but it is preferably in the range of 1 to 60% by weight, especially 3 to 40% by weight of the ultraviolet shielding powder. preferable. If the amount of the ultraviolet absorber is less than 1% by weight, the desired effect cannot be obtained, and if it exceeds 60% by weight, it becomes oily and has a poor feel, and is not preferable because it does not form a clean aggregate.

The amount of the ultraviolet-shielding powder of the present invention to be incorporated into cosmetics is adjusted depending on the formulation of the cosmetic, etc., and is not particularly limited, but is in the range of 2 to 50% by weight, particularly 5 to 30% by weight. It is preferable to have one.

In addition to the ultraviolet shielding powder of the present invention, which is an essential ingredient, the cosmetic of the present invention may contain white, body, and coloring pigments, varnishing agents, etc., which are usually used as cosmetic ingredients, depending on the type of parts, purpose, etc.
It is manufactured by appropriately selecting and blending natural minerals, organic powders, extraction agents, metal soaps, surfactants, humectants, preservatives, fragrances, and various other additives.

The cosmetics of the present invention can be powdered or
It may be pressed, liquid, stick, etc., or emulsified or oil-based, such as whitening powder, foundation, rouge, eye shadow, lipstick, eyeliner, mascara, eyebrow, base cream, powder. Examples include lotion.

[Action and effect of invention]

The ultraviolet shielding powder of the present invention is in the form of a pressure-disintegrable powder that adsorbs an ultraviolet absorber, so it disintegrates and becomes fine particles under pressure, and the adsorbed ultraviolet absorber is uniformly dispersed. It is distributed.

Therefore, when used, the cosmetic of the present invention containing this product has excellent transferability to the application body and spreads on the skin due to the action of the spherical ultraviolet shielding powder with a relatively large particle size. The pressure causes the UV-shielding powder to collapse and become fine particles.
It improves the adhesion to the skin and the adhesion of the cosmetic film, giving a natural finish, and the ultraviolet absorber is evenly dispersed, effectively blocking ultraviolet rays and protecting the skin.

Furthermore, since the cosmetic of the present invention is formulated with the UV absorber adsorbed to the pressure-disintegratable powder, a good dispersion state can be obtained even when a large amount of the UV absorber is blended, and the caking phenomenon can be prevented. It doesn't cause anything.

〔Example〕

Next, the present invention will be further explained with reference to Examples, but the present invention is not limited to these Examples.

Example ■ 100 parts by weight of pressure-disintegrable spherical titanium oxide was dissolved in Freon 113 in which 40 parts by weight of 2-ethyl hekylvar dimethylaminobenzoate (trade name: Escarol 507. Manufacturer: Vandyke) were dissolved. After the dispersion, Freon 113 was removed by drying under reduced pressure to obtain an ultraviolet shielding powder.

Example 2 Ultraviolet shielding powder was obtained in the same manner as in Example 1 using pressurized collapsible spherical alumina.

Example 3 90 parts by weight of particulate zinc oxide was dispersed in a solution of 10 parts by weight fB (2-ethylhexyl-para-dimethylaminobenthony) in isopropyl alcohol, and then treated by removing the isopropyl alcohol by drying under reduced pressure. A powder was obtained. Next, 20 parts by weight of this treated powder, 15 parts by weight of silica colloid, and 65 parts by weight of purified water were mixed and dispersed using a homomixer, and the resulting slurry was granulated using a spray dryer to obtain an ultraviolet shielding powder.

Example 4 90 parts by weight of fine titanium oxide and 4-tert-butyl-
10 parts by weight of 4'-methoxydibenzoylmethane (trade name: Valsol 1789. Manufacturer's name: Givaudan) were mixed and ground. Next, 20 parts by weight of this pulverized material, 15 parts by weight of silica colloid, and 90 parts by weight of purified water were mixed and dispersed using a homomixer, and the resulting slurry was granulated using a spray dryer to obtain an ultraviolet shielding powder.

Comparative example 1 Example construction using porous spherical nylon A UV-shielding powder was obtained.

Comparative example 2 Example 4 except that the ultraviolet absorber was removed and granulated.

Test Example 1 Measurement of ultraviolet blocking rate: Two alcoholic solutions of polyvinylpyrrolidone were placed on a quartz plate.
It was applied with a 5 μm doctor blade.

After the alcohol evaporated, a sample was applied uniformly to the adhesive surface using a soft brush to prepare a sample for measuring the blocking rate before powder disintegration.

Further, the above sample was coated with a cosmetic mat 20 times to obtain a sample for measuring the blocking rate after powder disintegration.

For each of the above samples, Shimadzu self-recording spectrophotometer UV-265
FW, transmittance was measured using the same unit integrating sphere 15R-260 (manufactured by Shimadzu Corporation). The measurement wavelength is in the UV-range (320-400
nm) or tlV-8 region (290 to 320 nm), and the transmission area of each region was determined from a chart.

The blocking rate is Calculated using the following formula.

As a result are shown in Table 1.

The powders of Examples 1 to 4 have a higher ultraviolet blocking rate after disintegration, and it is clear that the powders disintegrate into fine particles and the ultraviolet absorber is evenly dispersed. It is.

On the other hand, the powder of Comparative Example 1 did not disintegrate, and there was no change in the blocking rate before and after matte coating. Furthermore, although the powder of Comparative Example 2 was collapsible under pressure, the blocking rate in the UV-A region did not change before and after matte coating.

Examples 5 to 8 and Comparative Examples 3 to 9 Solid powder foundations having the compositions shown in Table 2 were prepared, and the ultraviolet blocking rate of each was measured in the same manner as in Test Example 1.

(Manufacturing method) A. Mix and grind components (1) to (17) to make them uniform.

B. Mix components (18) to (21) and dissolve by heating.

Add B to C and A, mix and grind.

D and C were filled and press molded to obtain a solid powder foundation.

In the foundations of Examples 5 to 8, the ultraviolet blocking rate clearly increases as the powder collapses due to the FJ cloth,
It had an extremely high ultraviolet shielding effect. In addition, it is easy to remove to matte, spreads well when applied, and has a feeling of adhesion.
A uniform and natural cosmetic film was formed.

On the other hand, the foundations of Comparative Examples 3 to 6 showed no change in the UV blocking rate before and after matte application, and even though they contained the same amount of UV absorber as Examples 5 to 8, they had no UV blocking effect. was inferior. In addition, in Comparative Examples 5 and 6, it was difficult to remove the matte, and the spread during application was also poor.
Caking occurred in some areas.

In the foundations of Comparative Examples 7 and 8, no increase in ultraviolet blocking rate was observed after matte application. Moreover, the cosmetic film was non-uniform.

The foundation of Comparative Example 9 had poor matte transition and spread during application, and caking occurred in some areas. Furthermore, no increase in the UV blocking rate was observed after matte coating.

Example 9 Solid powder lipstick (part) (wt%) (1
) Powder of Example 3 1° (2) Talc 3° (3) Mica
21(4) Mica titanium
15 (5) Red No. 226
10(6) Hydrophobized silica
3(7) Diglycerin triisostearate
6.9(8) Polyisobutylene 3
(9) 2-hydroxy-4-1 methoxybenzophenone 0 fragrance 0.1 (
Manufacturing method) A, Ii+i, parts (1) to (6) are mixed and pulverized.

B. Add components (7) to αQ to A and mix to make it homogeneous.

After mixing C and B with the same amount of ethanol, pour into a container and fill.

Dry D and C to obtain a solid powder lipstick.

The solid powdered lipstick obtained as described above is easy to remove when used, spreads smoothly on the container, has a feeling of adhesion when finished, can form a natural makeup film, and has excellent UV resistance. It had a shielding effect.

Example 10 (Calamine lotion) (part) (wt%) (1
) Red Garla 0.1
5(2) Powder of Example 3 5.0(
3) Kaolin 1.0 (4)
Ethyl alcohol 14.0 (5) Glycerin 4.0 (6) Camphor 0.15 (7) Fragrance
0.1 (8) Purified water remaining amount (manufactured
Method) A. Mix and pulverize components (Z) to (3).

B. Mix and dissolve components (4), (5) and (7).

After dissolving C1 component (6) in component (8), A and B
Add, mix and disperse.

The calamine lotion obtained as above is Spreads well when applied, Dense M feeling in the finish Along with there being It also has an excellent UV shielding effect. It was.

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Claims (2)

[Claims] (1) Ultraviolet shielding powder consisting of pressurized collapsible spherical powder adsorbing an ultraviolet absorber. (2) A cosmetic comprising the ultraviolet shielding powder according to claim 1.