JPH1135422A - Skin cosmetic and composition therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a skin cosmetic free from powder isolation or pale appearance in makeup, good in adhesion to puffs or the skin and good in spreadability over the skin, soft in feeling when applied, also high in ultraviolet radiation- proofing effect, by formulating powder coated with titanium oxide particles smaller in size. SOLUTION: First, spherical synthetic polymer powder (pref. of urethane-based polymer, 10-15 μm in average particle size) and titanium oxide particles smaller in size than the polymeric powder ones (pref. 0.5-2.0 μm) are subjected to mixing treatment in a weight ratio of normally (70:30) to (2:98), pref. (70:30) to (15:85) using a ball mill or crusher to coat the polymeric powder with the titanium oxide particles to obtain coated powder. The objective cosmetic (in particular, suitable as a makeup cosmetic) is obtained by formulating normally 0.1-50 wt.%, pref. 1-30 wt.%, more pref. 5-20 wt.% of the above coated powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to skin cosmetics, and more particularly to skin cosmetics such as powdery foundations and wet / dry foundations and compositions for skin cosmetics.

[0002]

2. Description of the Related Art Conventionally, foundation and other skin cosmetics, which are said to be mild, use titanium oxide (titanium white) as a pigment for imparting whiteness, and have an adhesive property to the skin.
Various compounding agents are added for elongation during application and for imparting other skin cosmetic properties.

[0003]

In recent years, it has been proposed to mix a high molecular weight polymer spherical powder, particularly from the viewpoints of lubricity during application and imparting adhesion to puffs. Examples of such a polymer powder include a spherical powder of a hexamethylene diisocyanate / trimethylolhexyllactone crosslinked polymer. By blending the spherical powder of the polymer, the slipperiness and elongation at the time of application are improved, and a soft feeling is obtained.

[0004] However, the dispersibility of titanium oxide tends to be poor, and the powdery properties of the resulting cosmetics are reduced by the addition of the above-mentioned polymer powder, and the adhesion to puffs during makeup is increased. Overcoating, causing so-called powder floating and streaks at the time of application, exhibiting an unnatural bluish whiteness, and having a poor finish feeling of the make.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages, to increase the amount of each of titanium oxide and the above-mentioned high-molecular polymer, to avoid powder floating and no paleness during makeup, Skin cosmetics and skin that have good adhesion to puffs, spread on the skin and adherence, have a soft feeling of use, improve dispersibility of titanium oxide, and can also enhance the effect of preventing ultraviolet rays. An object of the present invention is to provide a cosmetic composition.

[0006]

[Means for Solving the Problems]

[Invention according to claim 1] Skin obtained by blending a coated synthetic powder obtained by previously coating a spherical synthetic high polymer powder blended in a skin cosmetic with titanium oxide particles having a smaller particle diameter than the powder. Cosmetics.

[0007] In the present invention, the spherical synthetic high polymer powder to be blended in the skin cosmetic is blended in the skin cosmetic to impart various properties as the skin cosmetic.
Various properties as skin cosmetics include slipperiness / elongation, softness (soft feeling), adhesion to skin, adhesion to puffs, and other skin cosmetic properties when applying skin cosmetics. Say.

[0008] The present invention relates to a coated powder obtained by previously coating a spherical synthetic high molecular weight polymer powder to be incorporated into skin cosmetics for such various purposes with titanium oxide particles having a smaller particle diameter than the powder. As skin cosmetics. A large number of titanium oxide particles having a smaller particle diameter than the powder are attached to the surface of the spherical synthetic high polymer powder to cover the spherical synthetic high polymer powder. Such a coating state can be confirmed with a microscope. The degree of coating can be adjusted by the mixing ratio of the two.

[Invention according to claim 2] The spherical synthetic polymer powder is coated with titanium oxide particles by mixing them in a weight ratio of 70:30 to 15:85. The skin cosmetic according to claim 1, wherein

[Invention according to claim 3] The spherical synthetic polymer powder has an average particle diameter of 10 to 15 µm, and the titanium oxide particles have an average particle diameter of 0.5 to 2.0 µm. The skin cosmetic according to claim 1 or 2.

The invention according to claim 4 is characterized in that the spherical synthetic polymer powder is coated with titanium oxide particles by mixing them with a ball mill or a grinding machine. The skin cosmetic according to claim 1, 2, or 3.

[Invention according to claim 5] The skin cosmetic according to any one of claims 1, 2, 3 and 4, wherein the spherical synthetic high polymer powder is a spherical powder of a urethane-based polymer.

[Invention according to claim 6] The spherical synthetic high polymer powder comprises hexamethylene diisocyanate /
The skin cosmetic according to claim 5, which is a spherical powder of a trimethylolhexyllactone crosslinked polymer.

[Invention according to claim 7] A composition for skin cosmetics in which a spherical synthetic high polymer powder to be blended in the skin cosmetics is previously coated with titanium oxide particles having a smaller particle diameter than the powders ( Coated powder).

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The skin cosmetics according to the present invention generally refer to skin cosmetics, and it is particularly preferable to constitute them as makeup cosmetics. For example, it can be suitably used as a powdered skin cosmetic such as a powdery foundation or a wet / dry foundation. Of course,
It can also be constituted as a liquid foundation, a cream foundation and other skin cosmetics.

The skin cosmetic of the present invention is prepared by first mixing a spherical synthetic high polymer powder and titanium oxide particles having a smaller particle diameter than the powder in a required ratio. An important feature is that the combined powder is coated with titanium oxide particles to obtain a coated powder (skin cosmetic composition).

When the spherical synthetic high polymer powder is coated with titanium oxide particles, the two powders are usually mixed at a weight ratio of 7%.
0:30 to 2:98, preferably 70:30 to 15:85
By mixing.

When mixing the two, it is preferable to perform a mixing treatment using a ball mill or a crusher. By such a treatment, a spherical synthetic polymer powder (coated powder) whose surface is coated with titanium oxide particles is obtained.

In the present invention, it is important to coat the spherical synthetic high polymer powder with titanium oxide particles having a smaller particle diameter than the powder.

The average particle size of the spherical synthetic high polymer powder is usually 5 to 30 μm, preferably 10 to 15 μm.

The average particle diameter of the titanium oxide particles is usually
It is 0.01 to 10 μm, preferably 0.5 to 2.0 μm.

The average particle diameter of the coated powder obtained by coating is usually 10 to 25 μm, preferably 15 to 2 μm.
0 μm.

The mixing ratio of the coated powder coated with the titanium oxide particles to the skin cosmetic is not particularly limited, but is usually 0.1 to 50% by weight, preferably 1 to 30% by weight. %, More preferably 5 to 20% by weight. The compounding method may be performed according to a conventional method.

The spherical synthetic high molecular weight polymer powder used in the present invention is, as described above, incorporated into skin cosmetics in order to impart various properties as skin cosmetics, and is not particularly limited. Absent. For example, hexamethylene diisocyanate / trimethylolhexyl lactone is used as a spherical synthetic polymer powder mixed with skin cosmetics to impart slipperiness, elongation or flexibility (soft feeling of use) when applying the skin cosmetics. Spherical powders of urethane polymers, such as spherical powders of crosslinked polymers, are preferably used.

The mixing ratio (weight ratio) of the two in the coating treatment of the spherical synthetic polymer powder with the titanium oxide particles is as described above. However, the hexamethylene diisocyanate / trimethylolhexyllactone crosslinked polymer is used as the spherical synthetic polymer powder. When a powdery foundation is used in the case of using a spherical powder (hereinafter also simply referred to as polymer A), the mixing ratio (weight ratio) of polymer A and titanium oxide particles is 60:40 to 2
0:80 is preferred, and when constituting a wet and dry foundation, the ratio of polymer A and titanium oxide particles is as follows:
40:60 to 15:85 is preferred.

It is a preferred embodiment that the polymer A coated with the titanium oxide particles is blended with a makeup cosmetic comprising other components to constitute a makeup cosmetic such as a foundation. Examples of each powder compounding component of the makeup cosmetics include, but are not limited to, talc, mica, sericite, and kaolin, but are not particularly limited thereto, and various known cosmetic ingredients can be used. Needless to say.

[0027]

【Example】

Example 1 First, hexamethylene diisocyanate / trimethylolhexyl lactone crosslinked polymer spherical powder (Polymer A) was used as a spherical synthetic high polymer powder, and this was mixed with titanium oxide particles by a ball mill. A was coated with titanium oxide particles to obtain a coated powder (1).

The average particle size of the used polymer A is 12 μm.
m, the average particle diameter of the titanium oxide particles was 1 μm, and the blending ratio (weight ratio) of the polymer A and the titanium oxide particles was 1: 1.

A powdery foundation was obtained from the coated powder (1) obtained above by the following blending and production method.

[Formulation] 1. Coated powder (1) 10.0 wt% 2. Sericite 25.0 wt% Talc 45.0wt% 4. Mica 5.0 wt% 5. Bengara 0.6wt% 6. 1.9 wt% of yellow iron oxide 7. 7. Black iron oxide 0.1 wt% 8. Squalane 5.0 wt% 9. Octyldodecyl myristylate 2.0 wt% 10. Lanolin 3.0 wt% 11. Glyceryl tri-2-ethylhexanoate 2.0 wt% 12. Antioxidant appropriate amount 13. Preservative appropriate amount 14. Perfume appropriate amount Total 100.0wt%

[Production method] The above-mentioned components 1 to 7 were put into a Henschel mixer and mixed, and the above-mentioned components 8 to 1 were added thereto.
4 was heated and dissolved at 80 ° C., and mixed. Then, it was pulverized by an atomizer. This was placed in a metal dish and pressed to obtain a powdery foundation.

Comparative Example 1 The procedure of Example 1 was repeated except that the polymer A and the titanium oxide particles were blended without prior mixing.
In the same manner as in the above, a powdery foundation was obtained.

Example 2 First, hexamethylene diisocyanate / trimethylolhexyllactone crosslinked polymer spherical powder (Polymer A) was used as a spherical synthetic high polymer powder, and this was mixed with titanium oxide particles by a ball mill. Thus, polymer A was coated with titanium oxide particles to obtain a coated powder (2).

The average particle size of the polymer A used was 10 μm.
m, the average particle diameter of the titanium oxide particles was 1 μm, and the blending ratio (weight ratio) of the polymer A and the titanium oxide particles was 3: 7.

The coating powder (2) obtained as described above was used to obtain a dry / wet foundation by the following blending and production method.

[Formulation] 1. Coated powder (2) 10.0 wt% Silicone-treated sericite 35.0 wt% 3. Silicone-treated talc 37.0 wt% 4. Siliconized mica 5.0 wt% 5. 5. Yellow iron oxide 1.9 wt% Bengara 0.6wt% 7. 7. Black iron oxide 0.1 wt% 8. Squalane 4.0 wt% 9. Dimethyl polysiloxane 3.0 wt% 10. Lanolin 1.0 wt% 11. Glyceryl tri-2-ethylhexanoate 2.0 wt% 12. Antioxidant appropriate amount 13. Preservative appropriate amount 14. Perfume appropriate amount Total 100.0wt%

[Production method] The above-mentioned components 1 to 7 were put into a Henschel mixer and mixed.
4 was heated and dissolved at 80 ° C., and mixed. Then, it was pulverized by an atomizer. This was placed in a metal dish and press-molded to obtain a dry-wet foundation.

Comparative Example 2 Example 2 was repeated except that the polymer A and the particles of titanium oxide were blended without being mixed in advance.
In the same manner as in the above, a wet and dry foundation was obtained.

[Sensory evaluation] Each of the foundations of Examples and Comparative Examples was evaluated by 10 panelists specializing in makeup.
A use test was performed according to the following evaluation criteria. The results were as shown in Table 1.

[Evaluation Criteria] ：: 8 to 10 judged good ○: 5 to 7 judged good Δ: 3 to 4 judged good ×: 0 to 2 judged good

[0041]

[Table 1]

As is clear from Table 1, the skin cosmetic of the present invention has no unnatural bluish whiteness, is lightly spread, and has good adhesion to puffs.

[0043]

As described above, according to the skin cosmetic and the skin cosmetic composition of the present invention, the inconvenience based on the combined use of the spherical synthetic high polymer powder and the titanium oxide particles can be solved. , The amount of each of titanium oxide and the high-molecular polymer can be increased, there is no powder floating and no bluish whitening at the time of makeup, good adhesion to puff, good spread and adhesion to skin, and a soft feeling of use. In addition, a skin cosmetic is provided that has improved dispersibility of titanium oxide and can also increase the effect of preventing ultraviolet rays, and thus the effect is extremely large.

Claims (7)

[Claims] 1. A skin cosmetic comprising a spherical synthetic high molecular polymer powder to be mixed with a skin cosmetic, and a coated powder obtained by previously coating with a titanium oxide particle having a smaller particle diameter than the powder. 2. The method of coating a spherical synthetic high-molecular polymer powder with particles of titanium oxide comprises:
The skin cosmetic according to claim 1, wherein the cosmetic is performed by mixing at a ratio of 0 to 15:85. 3. The method according to claim 1, wherein the spherical synthetic polymer powder has an average particle diameter of 10 to 15 μm, and the titanium oxide particles have an average particle diameter of 0.5 to 2.0 μm. Skin cosmetics. 4. The coating treatment of spherical synthetic high molecular weight polymer powder with titanium oxide particles is carried out by mixing both with a ball mill or a grinding machine. Or the skin cosmetic according to 3. 5. The skin cosmetic according to claim 1, wherein the spherical synthetic high molecular polymer powder is a spherical powder of a urethane-based polymer. 6. The skin cosmetic according to claim 5, wherein the spherical synthetic polymer powder is a spherical powder of a cross-linked polymer of hexamethylene diisocyanate / trimethylolhexyllactone. 7. A composition for skin cosmetics, wherein a spherical synthetic high molecular weight polymer powder to be blended with the skin cosmetics is coated in advance with titanium oxide particles having a smaller particle diameter than the powder.