JP2805227B2 - Cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cosmetic containing a novel ultraviolet shielding powder having a high ultraviolet shielding effect and excellent in feeling and usability.

[Problems to be solved by conventional technology and invention]

Conventionally, in order to protect the skin from ultraviolet rays, an ultraviolet scattering agent and an ultraviolet absorber have been blended into sun-cut cosmetics and makeup cosmetics.

As the ultraviolet scattering agent, inorganic pigments such as fine particle titanium oxide and fine particle zinc oxide are used. These are excellent in ultraviolet ray shielding effect and suitable for obtaining a transparent feeling and a natural finish. However, cosmetics containing these compounds have poor spreadability on the skin, and further, solid powdery cosmetics In the case of the coating, a caking phenomenon occurs at the time of use, and there is a problem that the transferability to the coated body is deteriorated and the coating cannot be used.

For this reason, the above-mentioned problems have been solved by methods such as surface treatment of the fine particle inorganic pigment with metal soap or the like, spheroidization of the shape, or plate formation. However, although these methods are somewhat improved, they are still insufficient, and have a problem that the feeling of adhesion, naturalness, ultraviolet shielding effect, and the like of the finished film are impaired.

On the other hand, in the case of blending an ultraviolet absorber, if the ultraviolet absorber is blended in a large amount in order to increase the ultraviolet shielding effect, when the ultraviolet absorber is in a liquid state, it causes oiliness, stickiness, etc. In a system containing a large amount of body, it is difficult to obtain a good dispersion state, and in a solid powdery cosmetic, there are problems such as causing a caking phenomenon.

There has also been proposed a method of reducing skin irritation and obtaining a soft feeling of use by using a spherical porous resin powder in which an ultraviolet absorber is dispersed.
62-51931), and it was not satisfactory in terms of uniformity of spread on the skin, ultraviolet absorption effect, and the like.

For this reason, it has good transferability to the applied body, spreads to the skin, good adhesion, forms a cosmetic film having a uniform and tight feeling after makeup and a good finish state, and has an excellent ultraviolet shielding effect and a It is desired to provide an ultraviolet shielding powder for compounding.

[Means for solving the problem]

Under these circumstances, the present inventors have conducted intensive studies and as a result, have found that the above-mentioned problems can be solved by blending a pressure-disintegrating spherical powder adsorbed with an ultraviolet absorber into a cosmetic as an ultraviolet shielding powder. Heading, the present invention has been completed.

That is, the present invention is to provide a cosmetic which is characterized in that the ultraviolet absorber was blended ultraviolet shielding powders adsorbed pressurized disintegrating spherical powder shear breaking strength 10~260g / cm ² is there.

As the ultraviolet absorber used in the present invention, for example, 2
Amino such as -ethylhexyl-para-dimethylaminobenzoate, amyl-para-dimethylaminobenzoate, glyceryl-para-aminobenzoate, ethyl-para-dimethylaminobenzoate, ethyl-para-diethylaminobenzoate, and glyceryl-mono-para-aminobenzoate. Benzoate type; 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone Benzophenones such as, 2-hydroxy-4-methoxy-5-sulfobenzophenone; 2-ethoxyethyl-para-methoxycinnamate, 2,2'-bis (para-
Cinnamates such as methoxystyryl) -ethyl-para-methoxycinnamate, methyl-2,5-diisopropylcinnamate; para-t-butyl salicylate, para-octylphenyl salicylate, dipropylene glycol salicylate, Phenyl salicylate, para-t-
Salicylates such as butylphenyl salicylate; 4-methoxy-4'-t-butyldibenzoylmethane, 2,4-
Dibenzoylmethanes such as dimethyl-4'-methoxydibenzoylmethane and 4-isopropyldibenzoylmethane; 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ' -T
Benzotriazoles such as -butyl-5'-methylphenyl) -5-chlorobenzotriazole; and imidazoles such as urocanic acid and ethyl urocanate can be used. Can be selected and used.

The pressure-disintegrating spherical powder used in the present invention is a spherical composite powder obtained by aggregating a powder for cosmetics, which is broken by pressurization and turned into fine powder.

As a method for granulating the pressure-disintegrating spherical powder, a spray drying method, a fluidized bed granulation method and the like can be applied.In order to adjust the hardness of the granulated material, an inorganic colloid liquid, a water-soluble polymer, etc. Can be used as

The cosmetic powder used for the production of the pressure-disintegrating spherical powder is not particularly limited as long as it is generally used for cosmetics, and examples thereof include white pigments such as titanium oxide and zinc oxide;
Colored pigments such as yellow iron oxide, red iron oxide, black iron oxide, ultramarine, navy blue, tar pigments, natural pigments, etc .; extenders such as talc, mica, sericite, calcium carbonate, magnesium carbonate, silica, alumina, kaolin; titanium mica , Pigments such as bismuth oxychloride; nylon, polystyrene,
Organic powders such as polymethyl methacrylate, crystallized cellulose, starch and the like can be mentioned. The average particle size of these cosmetic powders is preferably in the range of 0.001 to 50 μm.

As the inorganic colloid liquid, for example, an aqueous sol such as silica, alumina, titania, and zirconia is used. The dispersed colloid particle size is 50-1000Å, especially 100-300Å
Is preferable. If it is less than 50 °, it is difficult to obtain, and if it exceeds 1000 °, the bonding strength of the particles is weak, and the particles are easily broken, which is not preferable. Commercially available products include, for example, Adelite AT (manufactured by Asahi Denka Co., Ltd.), Ludox HS40 (manufactured by DuPont), Neosambale (manufactured by Kato Kasei), alumina clear sol (manufactured by Kawaken Fine Chemical Co., Ltd.), and the like.

Examples of the water-soluble polymer include methyl cellulose, carboxymethyl cellulose, and polyvinyl alcohol.

In the present invention, the pressure-disintegrating spherical powder obtained by spray-drying a slurry obtained by dispersing a cosmetic powder and an inorganic colloid liquid in a dispersion medium is particularly suitable for imparting appropriate particle strength. preferable.

The average agglomerated particle size of the pressure-disintegrating spherical powder is 1 to 100 μm
Is preferably within the range. If the thickness is less than 1 μm, it is difficult to prepare, and the properties of the powder which is too small and spherical are difficult to appear.

Further, the pressure disintegrability of the pressure disintegrable spherical powder of the present invention is, for example, using a Haydon surface property measuring instrument, when determined as the shear fracture strength from the change in the frictional resistance value against the load, 10 to 10
It is preferably within the range of 260 g / cm ² . That is, when the content is within this range, the particles are easily disintegrated during the rubbing of the cosmetic containing the same, and there is no residual feeling such as a feeling of particles and an unpleasant sensation, and an excellent adhesion and a fine decorative film can be obtained. The shear breaking strength is less than 10 g / cm ^2, in the manufacture of mechanical strength is low for cosmetics, mixing, grinding, breaking of particles will occur in the process such as a press, it exceeds 260 g / cm ^2, rub The strength becomes too large, the particles do not collapse under the application pressure, and the object of the present invention is not achieved.

In the present invention, examples of a method for adsorbing the ultraviolet absorbent to the pressure-disintegrating spherical powder include the following methods.

A method of impregnating an ultraviolet absorbent dissolved in a solvent into a pre-produced pressure-disintegrating spherical powder and then removing the solvent.

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

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

Here, the amount of the ultraviolet absorber used depends on the oil absorption of the cosmetic powder and the like and cannot be specified unconditionally, but the range of 1 to 60% by weight, particularly 3 to 40% by weight in the ultraviolet shielding powder is preferred. 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, oiliness is generated and the touch is deteriorated, and a clean aggregate is not preferable.

The blending amount of the ultraviolet shielding powder of the present invention in the cosmetic is adjusted according to the type of the cosmetic and is not particularly limited, but is in the range of 2 to 50% by weight, particularly 5 to 30% by weight. Preferably it is.

The cosmetics of the present invention, besides the ultraviolet shielding powder of the present invention, which is an essential component, depending on the product type, purpose, etc., are usually used as cosmetic components, white / body / color pigments, pearling agents, natural minerals, It is manufactured by appropriately selecting and blending organic powder, oil, water, metal soap, surfactant, humectant, preservative, fragrance, and other various additives.

The cosmetic of the present invention may be in any form, regardless of product form, such as powder, pressed, liquid, and stick, and emulsified type.
Any type such as an oily type may be used.
Foundation, cheek red, eyeshadow, lipstick, eye liner, mascara, eyebrow, base cream, powdered lotion and the like.

[Action and effect of the invention]

Since the ultraviolet shielding powder of the present invention is in the form of a pressure-disintegrating powder to which an ultraviolet absorbent is adsorbed, it disintegrates into fine particles by applying pressure, and the adsorbed ultraviolet absorbent becomes uniform. Is to be dispersed.

Therefore, when used, the cosmetic of the present invention, when used, is excellent in transferability to an applied body, spreads to the skin, and rubs on the skin by the action of a spherical ultraviolet shielding powder having a relatively large particle size when used. The UV shielding powder breaks down into fine particles due to the pressure, and the adhesion to the skin and the feeling of adhesion of the cosmetic film are improved, resulting in a natural finish, and the UV absorber is evenly dispersed to effectively block ultraviolet rays. And protect your skin.

Further, since the cosmetic of the present invention is blended in a state in which the ultraviolet absorber is adsorbed on the pressure-disintegrating powder, a good dispersion state can be obtained even when a large amount of the ultraviolet absorber is blended, and the caking phenomenon Also does not cause.

〔Example〕

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

Example 1 100 parts by weight of pressure-disintegrable spherical titanium oxide was dispersed in 40 parts by weight of 2-ethylhexyl-para-dimethylaminobenzoate (trade name: Escalol 507, manufacturer: Vandike) dissolved in Freon 113. After that, CFC 113 was removed by drying under reduced pressure to obtain an ultraviolet shielding powder.

Example 2 An ultraviolet shielding powder was obtained in the same manner as in Example 1 except for using a pressure-collapsible spherical alumina.

Example 3 After dissolving 90 parts by weight of fine zinc oxide in 10 parts by weight of 2-ethylhexyl-para-dimethylaminobenzoate dissolved in isopropyl alcohol, isopropyl alcohol was removed by drying under reduced pressure to obtain a treated powder. Was. Next, a slurry obtained by mixing and dispersing 20 parts by weight of the treated powder, 15 parts by weight of silica colloid, and 65 parts by weight of purified water with a homomixer was granulated by a spray dryer to obtain an ultraviolet shielding powder.

Example 4 90 parts by weight of fine particle titanium oxide and 4-tert-butyl-4 '
-Methoxydibenzoylmethane (trade name: Parsol 17)
89, Manufacturer name: Givaudan) 10 parts by weight were mixed and pulverized. Next, a slurry obtained by mixing and dispersing 20 parts by weight of the pulverized product, 15 parts by weight of silica colloid, and 90 parts by weight of purified water with a homomixer was granulated by a spray dryer to obtain an ultraviolet shielding powder.

Comparative Example 1 An ultraviolet shielding powder was obtained in the same manner as in Example 1 using porous spherical nylon.

Comparative Example 2 Granulation was performed in the same manner as in Example 4 except that the ultraviolet absorber was omitted.

Test Example 1 Measurement of UV Shielding Ratio: An alcohol solution of polyvinylpyrrolidone was placed on a quartz plate.
It was applied with a 25 μm doctor blade. After alcohol evaporation, apply the sample uniformly to the adhesive surface with a soft brush,
It was used as a sample for measuring the cutoff ratio before powder disintegration. In addition, the sample was rubbed 20 times with a cosmetic mat to obtain a sample for measuring a blocking rate after powder disintegration.

For each of the above specimens, Shimadzu self-recording spectrophotometer UV-265F
W, the transmittance was measured by an ISR-260 integrating sphere of the unit (all manufactured by Shimadzu Corporation). The measurement wavelength is UV-A region (320-400nm) or UV-B depending on the absorption characteristics of the UV absorber.
Regions (290 to 320 nm) were set, and the transmission area of each region was determined from the chart. The cutoff rate was calculated by the following equation. Table 1 shows the results.

The powders of Examples 1 to 4 had higher UV blocking rates after disintegration, and the powders disintegrated and became fine particles,
It is clear that the UV absorber is also uniformly dispersed. In contrast, the powder of Comparative Example 1 did not disintegrate, and there was no change in the cutoff ratio before and after mat rubbing. The powder of Comparative Example 2 was pressure-disintegrable, but the cutoff rate in the UV-A region did not change before and after mat 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 ray blocking rates were measured in the same manner as in Test Example 1.

(Production method) A. Components (1) to (17) are mixed and pulverized to make them uniform.

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

C. Add B to A, mix and grind.

DC was filled and press-molded to obtain a solid powdery foundation.

In the foundations of Examples 5 to 8, the ultraviolet ray blocking rate was clearly increased with the disintegration of the powder by mat application,
It had an extremely high UV-shielding effect, it was easily removed from the mat, had good spreadability when applied, and had a feeling of adhesion.
A uniform and natural cosmetic film was formed.

On the other hand, the foundations of Comparative Examples 3 to 6 had no change in the ultraviolet ray blocking ratio before and after the mat application, and contained the same amount of the ultraviolet absorbent as Examples 5 to 8, but the ultraviolet ray shielding effect. Was inferior. Comparative Example 5
In Nos. 6 and 7, the removal to the mat was poor, the spread at the time of application was poor, and caking occurred partially.

The foundations of Comparative Examples 7 and 8 did not show an increase in the ultraviolet ray blocking rate after mat application. Also,
The decorative film was uneven.

The foundation of Comparative Example 9 had poor transferability to a mat and poor spread at the time of application, and partially caused caking. Further, no increase in the ultraviolet ray blocking rate after the mat application was observed.

Example 9 Solid powder lipstick (component) (% by weight) (1) Powder of Example 3 10 (2) Talc 30 (3) Mica 21 (4) Titanium mica 15 (5) Red No. 226 10 (6) ) Hydrophobic silica 3 (7) Diglycerin triisostearate 6.9 (8) Polyisobutylene 3 (9) 2-Hydroxy-4-methoxybenzophenone 1 (10) Fragrance 0.1 (Production method) A. Components (1) to ( 6) is mixed and pulverized.

Add components (7) to (10) to BA and mix to make uniform.

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

D. Dry C to obtain a solid powder lipstick.

The solid powder lipstick obtained as described above is easy to remove at the time of use, spreads smoothly on the lips, has a feeling of adhesion in the finish, can form a natural makeup film, and has excellent ultraviolet light It had a shielding effect.

Example 10 (calamine lotion) (component) (% by weight) (1) Bengala 0.15 (2) Powder of Example 3 5.0 (3) Kaolin 1.0 (4) Ethylene alcohol 14.0 (5) Glycerin 4.0 (6) Camphor 0.15 (7) Fragrance 0.1 (8) Remaining amount of purified water (Production method) A. Mix and grind components (1) to (3).

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

C. After dissolving component (6) in component (8), add A and B, mix and disperse.

The calamine lotion obtained as described above had good spreadability at the time of application, had a close feeling in the finish, and had an excellent ultraviolet shielding effect.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-181211 (JP, A) JP-A-62-185775 (JP, A) JP-A-60-208908 (JP, A) 31023 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) C09K 3/00 104 A61K 7/02

Claims (1)

(57) [Claims] 1. A cosmetic comprising a pressure-disintegrating spherical powder having a shear breaking strength of 10 to 260 g / cm ² and an ultraviolet shielding powder obtained by adsorbing an ultraviolet absorbent.