JP2948309B2 - Cosmetics - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to cosmetics, and more particularly, to cosmetics having excellent ultraviolet protection efficiency.

[Conventional technology]

Conventional cosmetics having an ultraviolet protection effect include inorganic pigments such as titanium dioxide, zinc oxide and iron oxide, or oxybenzone, urocanic acid, P-amino, benzoic acid derivatives,
There are those in which an ultraviolet absorber such as a salicylic acid derivative is used alone or in combination, and a spherical porous resin powder containing a substance having an ultraviolet transmission preventing function, i.e., an inorganic pigment, an ultraviolet absorber, etc. is also used. Cosmetics (JP-A-57-120514), cosmetics in which an ultraviolet absorber is encapsulated in the hollow portion of a vinyl polymer powder (JP-A-62-198612), and ultraviolet light for flat granular resin fine powder Cosmetics containing an absorbent (JP-A-63-2919) are known.

[Problems to be solved by the invention]

As described above, in the case of simply blending titanium oxide or the like or an ultraviolet absorber like a cosmetic having a conventional ultraviolet protection effect, since there is no effect unless blended in a large amount, for example, in the case of titanium oxide or the like, When applied, the concealing power is increased, the cosmetic finish is whitish and has no naturalness, and safety problems such as skin irritation occur with an ultraviolet absorber.
And, in the case where the spherical porous powder contains an ultraviolet absorber, the properties of the surface itself of the spherical powder come out, and the effect of the ultraviolet absorber is hardly sufficiently exhibited,
In the case where the ultraviolet absorber is included in the hollow portion of the vinyl polymer powder, the diffuse reflection effect of the powder itself has priority,
It is presumed that the ultraviolet rays hardly reach the ultraviolet absorber and the effect of the ultraviolet absorber cannot be sufficiently exhibited. And, in the case where the ultraviolet absorbent is contained in the flat granular resin fine powder, because of the flat particles, the spreadability is inferior to that of the spherical powder, the uniform dispersibility is inferior in the cosmetic system, and the peeling is also difficult. It has been pointed out that a problem arises, and it is presently desired to develop a cosmetic material capable of maximizing the ultraviolet absorbing effect of the ultraviolet absorbent.

[Means for solving the problem]

The present inventors have conducted intensive studies on cosmetics capable of maximizing the effect of absorbing ultraviolet light. As a result, a cosmetic material obtained by coating the surface of an inorganic spherical powder or an organic spherical powder with an ultraviolet absorbent in advance is used. The present inventors have found that a cosmetic that is blended solves the above-mentioned problems, and have reached the present invention.

That is, the present invention relates to a cosmetic material comprising an inorganic spherical powder or an organic spherical powder (excluding cellulose and nylon), the surface of which is coated and bound with an ultraviolet absorber (however, excluding polyvalent metal salts). Thus, the cosmetic material does not have pressure disintegration, and the amount ratio of the powder and the ultraviolet absorber is 95: 5 to 60:40. The present invention relates to cosmetics containing 60% by weight.

 Hereinafter, the present invention will be described in detail.

Examples of the inorganic spherical powder used in the present invention include spherical calcium silicate (see JP-A-54-163830; hereinafter, referred to as silica beads) and spherical silica gel (JP-A-54-140736).
(Hereinafter referred to as silica beads), spherical silica gel treated with aluminum stearate, titanium-coated polyethylene beads and the like.

Examples of the organic spherical powder include methacrylate resin powder (refer to JP-A-59-193901, hereinafter referred to as hollow beads), spherical polymethyl methacrylate powder, polyethylene beads, polyvinyl acetate, poly N-vinylpyrrolidone, Poly 2,4-diamino-6-phenyl-1,3,5-triazine, polyacrylate, stildivinylbenzene copolymer, ethylene vinyl acetate copolymer, vinyl chloride vinyl acetate copolymer, polytetrafluoride Ethylene and the like can be mentioned.

 The average particle size of these spherical powders is 0.01 to 25μ.

Next, as the ultraviolet absorber used in the present invention, those generally used in conventional cosmetics can be used as they are or after being processed. For example, benzoic acid-based ultraviolet absorbers, salicylic acid-based ultraviolet absorbers, cinnamic acid-based ultraviolet absorbers (eg, octyl methoxycinnamate), benzophenone-based ultraviolet absorbers, and others (oxybenzone, urocanic acid, etc.) can be mentioned. it can.

The ratio between these spherical powders and the ultraviolet absorber is 95: 5 to
60:40, preferably 80:20 to 70:30. When the amount ratio of the ultraviolet absorber is low, the coating amount is small, and when it is blended into a cosmetic, a sufficient ultraviolet protective effect cannot be obtained, and the ultraviolet absorber is blended in the production process, which is not preferable. On the other hand, when the amount ratio of the ultraviolet absorber is high, the coating amount is large, the powder tends to be mamako (lumps), the compounding (dispersion) property in the cosmetic is poor, and the powder is not uniformly dispersed throughout the cosmetic. However, a sufficient ultraviolet protection effect cannot be obtained, which is not preferable.

Cosmetic material consisting of an inorganic spherical powder or an organic spherical powder whose surface is coated and bound with the ultraviolet absorbent of the present invention is prepared by charging the powder into a mixer, heating and degassing while mixing at a low speed, Spray or drop coating the absorbent. Addition baskets can also be obtained by mixing, fully covering and then cooling.

As the mixer, a Henschel mixer, a rotation-revolution type mixer (double planetary mixer, hereinafter abbreviated as DPM) or the like is used. The solid ultraviolet absorber is used by dissolving it in an ester-based oil agent, and the liquid ultraviolet absorber is heated and coated and bonded to form a uniform coating.

In the method for producing a cosmetic material of the present invention, the powder, particularly the porous powder, is mixed and degassed to increase the coating bond holding power. By heating, the coating of the ultraviolet absorber to the powder is promoted. Also, if a mixture of a volatile oil having a moderate permeability and a UV absorber is diluted with 1 to 3 times the amount of a cyclic silicone oil, a low molecular weight hydrocarbon, or chlorofluorocarbon in advance, a more uniform coating bond can be obtained. it can.

In the present invention, the fact that the ultraviolet absorber is coated and bound on the powder surface can be reduced, for example, by treating the ultraviolet absorber-coated powder with a solvent having good compatibility with the ultraviolet absorber. Can be confirmed.

The compounding ratio of the cosmetic material in which the surface of the powder used in the present invention is coated and bonded with an ultraviolet absorber is preferably 2 to 60% by weight, more preferably 10 to 40% by weight based on the total amount of the cosmetic. When the compounding ratio of the material used in the present invention is lower than 2% by weight,
It is not preferable because the ultraviolet protection effect is extremely reduced. On the other hand, if the compounding ratio of the material used in the present invention is higher than 60% by weight, the UV protection effect will not be improved for the compounding amount, and the effect of the cosmetic material itself will appear strongly, and the spreadability will deteriorate, and the thickness will deteriorate. It is not preferable because the taste becomes sticky and the usability deteriorates.

Next, in the cosmetic of the present invention, in addition to the above-mentioned cosmetic material in which the surface of the powder is coated and bonded with an ultraviolet absorbent, various raw materials usually used in cosmetics can be blended. Examples of the base include coloring agents such as red iron oxide, yellow iron oxide, gunjou and tar pigments, oils such as silicone oil, octyldodecyl myristate, cetyl octanoate, and glycerin tri-2-ethylhexanoate, surfactants, and polyvalent agents. alcohol,
Ethanol, metal soap, etc.
Flavors, preservatives, antioxidants, and various other medicinal ingredients (for example,
Hyaluronic acid, allantoin, [gamma] -oryzanol, reticin) and the like.

The cosmetic of the present invention is a material which is excellent in the effect of shielding, scattering or absorbing ultraviolet rays which have a harmful effect on the skin, hardly transmits the ultraviolet rays, and is excellent in adhesiveness to the skin, spreadability, and natural It is a cosmetic that gives a perfect finish.

As a method for producing the cosmetic of the present invention, a usual production method can be used as it is.

[Action]

By coating the surface of the powder with the ultraviolet absorbent, the effect of the ultraviolet absorbent can be sufficiently exerted when blended into a cosmetic.

〔Example〕

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

 In addition, the compounding amount is a weight part.

Manufacture of cosmetic materials consisting of powder coated and bound with UV absorber <Material I> (Prescription) (Preparation method) A Henschel mixer is charged and spray-mixed while mixing at a low speed (800 rpm), and then mixed and coated for 10 minutes to obtain a material I (particle size: 3 to 26μ) after sufficiently coating and binding. .

<Material II> (Prescription) (Manufacturing method) DPM is charged, and heated to 50 to 60 ° C. while degassing and stirring. Preheated to 50 ° C is dropped from a hopper, coated, and then stirred and coated for 15 minutes. After sufficient coating and bonding, the mixture is cooled to 30 ° C, returned to normal pressure, and taken out. 2626μ).

<Material III> (Prescription) (Preparation method) DPM is charged, and degassed and stirred. After the degassing is completed, a solution having a medium permeability is dropped from a hopper and mixed and coated. After mixing and stirring for 15 minutes after dropping, the pressure was returned to normal pressure, and 80-
The mixture is heated to 90 ° C., volatilized and collected, cooled (30 ° C.), and taken out to obtain a raw material III (particle size: 3 to 26 μ).

In addition, the thickness of the coating of the ultraviolet absorber is 0 in all materials.
It was 5-1.2 μm.

Next, a confirmation test is performed to confirm that the surface of the powder is covered with the ultraviolet absorbent.

FIG. 2 is a UV spectrum showing the transmittance in the ultraviolet region of the cosmetic material according to the present invention.

 The measuring method is the same as in FIG.

In FIG. 2, reference numeral 1 denotes the UV of the material III according to the present invention.
This is a spectrum, and the UV transmittance is 0%.

In the figure, reference numeral 2 denotes a UV spectrum of a residue after filtration of 5 g of the raw material III with 20 g of hexane, and the UV transmittance thereof is about 15%.

In the figure, 3 is a UV spectrum of the residue after filtration, in which 5 g of a mixture obtained by simply mixing the same constituent components as the raw material III was extracted with 20 g of hexane.
%.

Also, reference numeral 4 in the figure denotes a UV strut of only a powder (hollow beads, fine caical beads) which is one of the constituent components of the raw material III, and the UV transmittance is 50 to 60%.

As shown in FIG. 2, the material III according to the present invention has a UV transmittance of 0% (1), which means that the material III is efficiently protected from ultraviolet rays. It can be seen that the powder is coated on the surface. When material III is treated with a solvent, its UV transmittance is about 15% (2), and the UV protection effect is reduced. The transmittance is about 40% (3), and the UV protection effect of the material of the present invention is much better. This indicates that in the material of the present invention, the ultraviolet absorbent hardly elutes in the solvent, and that the ultraviolet absorbent is bonded to the powder. As described above, it is understood that the cosmetic material of the present invention has the ultraviolet absorbent coated and bound to the powder surface.

Next, an example of a conventional technique for manufacturing a material in which an ultraviolet absorber is included in a hollow portion of a powder will be described.

<Material IV> (Prescription) (Preparation method) DPM is charged, and degassed and stirred. After the degassing is completed, a solution dissolved in a highly permeable solvent is dropped from a hopper and mixed and coated. After dropping, DP
M. is heated and the methylene chloride is evaporated and recovered with stirring, and octyl methoxycinnamate is contained in the hollow portion of the mixture to take out and obtain a raw material IV (particle size: 3 to 25 μm).

Example 1 Pressed Powder Foundation (Prescription) Is mixed with a Henschel mixer, transferred to a pulverizer (pulverizer), and pulverized. Add to Henschel mixer again, add and coat with oil. And further mixed. After mixing well, the mixture is disintegrated with a parveralizer, transferred to a medium plate and pressed to obtain a product.

Test of UV protection effect <Experimental method and results> (Sample) Example 1 and Comparative Examples 1 and 2 (Experimental method) 1 g of a sample was placed in a beaker, 4 g of castor oil was added and mixed, and then subjected to a Hooper muller (50 rotations × 3) Prepare a sample. A uniform thin film is formed on a quartz glass plate using a doctor blade (0.5 mil). The transmittance from the ultraviolet to the visible region is measured with a Shimadzu self-recording spectrophotometer UV-240.

(Results) The results are as shown in FIG.

Example 1 of FIG. 1 (comprising a material III obtained by coating the surface of a powder in advance with an ultraviolet absorber) and Comparative Example 1 (a method conventionally used generally, As is apparent from Comparative Example 2 (compounding a so-called inert powder material IV in which a hollow portion of the powder is encapsulated with an ultraviolet absorbent), and Comparative Example 2 (compound containing an ultraviolet absorber). In No. 1, particularly, the ultraviolet B region (280 to 320 nm) is almost completely cut. In addition, ultraviolet A region (320 to 400
nm), the transmittance is small. However, Comparative Example 1 does not show a sufficient cutting effect. Furthermore, in Comparative Example 2, since the ultraviolet absorber was included in the hollow portion of the powder, a specific transmission curve of the ultraviolet absorber was not exhibited.

Erythema suppression enhancing effect (hereinafter referred to as SPF) test <Experimental methods and results> (Samples) Example 1 and Comparative examples 1 and 2 (Experimental method) 60 volunteers are divided into three groups of 20 volunteers each. 2.0 mg / cm ² of the sample is applied to the left back, and the right back is left uncoated. Determine the amount of ultraviolet light required to cause minimal erythema after exposure to sunlight (determined after 24 hours).

Table 2 shows the average values of the 20 subjects.

(result) As is clear from the results in Table 2, the SPF value of the product of the present invention is 10.5, which is higher than the SPF value of the control product of 6.8, 8.0.

That is, it is understood that the product of the present invention has an excellent erythema suppression enhancing effect.

Example 2 Loose Powder Foundation (Prescription) (Preparation method) is mixed in a Henschel mixer. After mixing
Crush with a pulverizer. The ground powder is again charged into a Henschel mixer, added, and coated with an oil agent. Charge after coating and mix again. After mixing well, crush and finish with a pulverizer.

Example 3 teak color (prescription) (Preparation method) is charged into a Henschel mixer, mixed, and pulverized with a pulverizer. This is again charged into a Henschel mixer, added, and coated with an oil agent. Charge after coating and mix again. After mixing well, crush and finish with a pulverizer.

〔The invention's effect〕

Cosmetics obtained by blending a cosmetic material obtained by coating the surface of the powder of the present invention with an ultraviolet absorber in advance are more effective in protecting the skin from ultraviolet rays and suppressing erythema as compared with those containing a ultraviolet absorber alone. It is an excellent cosmetic in that it is excellent in enhancing effect and fully exerts the effect of the ultraviolet absorber.

[Brief description of the drawings]

FIG. 1 is a graph of a UV spectrum showing the effect of comparing and measuring the transmittance in the ultraviolet to visible region of the pressed powder foundation of Example 1 of the present invention and the pressed powder foundations of Comparative Examples 1 and 2. FIG. 2 is a graph of a UV spectrum showing that the cosmetic material of the present invention has a powder surface coated with an ultraviolet absorbent. In the figure, reference numeral 1 denotes a spectrum of the material III. In the figure, reference numeral 2 denotes a spectrum of the residue after extraction of hexane of the material III. In the figure, 3 is the spectrum of the residue after the hexane extraction of the mixture of the same components as the raw material III. In the figure, reference numeral 4 denotes a spectrum of only the powder which is a constituent component of the material III.

Continuation of front page (56) References JP-A-60-149517 (JP, A) JP-A-1-180812 (JP, A) JP-A-3-99008 (JP, A) JP-A-3-181584 (JP) , A) JP-A-4-185690 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A61K 7/42 A61K 7/02 A61K 7/035

Claims (1)

(57) [Claims] 1. An ultraviolet absorber (excluding polyvalent metal salts)
A cosmetic material comprising an inorganic spherical powder or an organic spherical powder (excluding cellulose and nylon), the surface of which is bound and coated with, the cosmetic material does not have pressure disintegration,
A cosmetic comprising 2 to 60% by weight of a cosmetic material having a ratio of powder to ultraviolet absorber of 95: 5 to 60:40 based on the total amount of the cosmetic.