JP3490488B2 - Cosmetics - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic having a high ultraviolet ray preventing effect.

[0002]

2. Description of the Related Art Conventionally, fine particles of titanium oxide having an average particle diameter of 0.03 to 0.05 .mu.m have been mainly used as a powder for enhancing the ultraviolet ray preventing effect of cosmetics.

[0003]

However, the cosmetics containing the powder having the ultraviolet ray preventing effect have a certain degree of the ultraviolet ray preventing effect, but have never been satisfactory. Further, when the amount of the compound is increased in order to enhance the effect of preventing ultraviolet rays, there are problems in terms of texture such as graininess and spreadability, and in terms of finish such as whitishness. In addition, recently, the range of activities for women's leisure has expanded, and it has become quite active, such as enjoying marine sports such as sailing, windsurfing, diving, golf, tennis, skiing, etc., traveling overseas and going on vacation. Came. Therefore, it is inevitably exposed to a considerable amount of ultraviolet rays, awareness of ultraviolet rays is increased, and cosmetics having a high ultraviolet ray prevention effect are strongly demanded. Moreover, people's awareness of ultraviolet rays has changed due to the destruction of the ozone layer, which is a representative of environmental destruction, and people are now strongly aware of ultraviolet rays prevention, and along with this, cosmetics with a higher ultraviolet ray prevention effect are required. Has been. Furthermore, modern people
Many people are suffering from atopic dermatitis and skin diseases that are thought to be caused by stress, and they are sensitive to the effects of cosmetics on the skin. No UV absorber is added to makeup base or foundation,
In addition, there is a strong demand for a material having a high ultraviolet ray prevention effect.

[0004]

Means for Solving the Problems The inventors of the present invention have paid attention to the above points, and as a result of earnest studies, as a result, by using a combination of fine particles of titanium oxide having different particle shapes, the ultraviolet ray prevention effect is synergistic. The present invention has been accomplished by discovering that it can be improved to That is, according to the present invention, the first particulate titanium oxide having a particle shape close to a sphere and having an average particle diameter of 0.01 to 0.10 μm, and a particle shape having a spindle shape and a minor axis of 0.0.
It is a cosmetic characterized by containing a second fine particle titanium oxide having a major axis of 0.05 to 0.02 μm and a major axis of 0.01 to 0.10 μm.

The structure of the present invention will be described in detail below. The first fine particle titanium oxide according to the present invention has an average particle size of 0.0
It has a spherical shape of 1 to 0.10 μm. Also, the second
The fine particle titanium oxide is spindle-shaped and has a minor axis of 0.005
The diameter is 0.02 μm and the major axis is 0.01 to 0.10 μm. In the first and second fine particles of titanium oxide, if the average particle diameter, the long diameter and the short diameter are too small, the powder agglomerates, and as a result, the ultraviolet protection effect and usability deteriorate, and if the particle diameter is too large, The transparency is impaired, and the UV protection effect is also impaired. The fine particle structures of the first fine particle titanium oxide and the second fine particle titanium oxide by electron microscope photographs are shown in FIGS. 1 and 2, respectively. In order to suppress the surface activity of these fine titanium oxide particles, those surface-treated with an inorganic material such as aluminum oxide, silicon oxide, or zirconium oxide, diisostearyl malate, isotridecyl isononanoate, or trimethylol triisostearate. Those which are surface-treated with an organic substance such as propane can also be used as long as they do not affect the particle shape. Furthermore, fine particle titanium oxide surface-treated with the above inorganic or organic material, silicone treatment, fatty acid treatment,
A product obtained by performing a hydrophobic treatment such as a metal soap treatment or a fluorine treatment can also be used as long as it does not affect the particle shape.

The mixing ratio of the first fine particle titanium oxide and the second fine particle titanium oxide is as follows:
The mixing ratio (weight ratio) of the second particulate titanium oxide is 3: 1 to
The ratio is 1: 9, preferably 1: 1 to 1: 5, and the total amount of both is 3 to 30% by weight, preferably 6 to 20% by weight based on the total amount of the cosmetic. In this range, the ultraviolet ray prevention effect is most exerted. When fine particle titanium oxide having a spherical particle shape and weight-proof fine particle titanium oxide are combined, the ultraviolet ray prevention effect is synergistically increased at a specific ratio because each fine particle titanium oxide has the best dispersion at that specific ratio. It is thought to be due to the state.

In FIG. 3, the base is an ordinary powder type foundation, and the total amount of fine titanium oxide particles is 5
The relationship between the compounding ratio of each fine particle titanium oxide and the SPF (Sun Protection factor) value is shown when the weight ratio is 10% and 10% by weight.
● represents the case where the total blending amount is 10% by weight. Here, the first fine particle titanium oxide has an average particle diameter of 0.03 μm, and the second fine particle titanium oxide has a long diameter of 0.03 μm.
m and a minor axis of 0.008 μm were used. In any case, it can be seen that the SPF value has a peak at around the first fine particle titanium oxide: second fine particle titanium oxide = 1: 2. The SPF value is, for example, SPF.
When using sun care cosmetics of 8, when the skin is exposed to 8 times more ultraviolet rays than when it is sunburned, the sunscreen (erythema) similar to that of bare skin will be produced. Means high.

Further, in the present invention, the effect of preventing ultraviolet rays can be effectively enhanced by incorporating an ultraviolet absorber. Examples of the ultraviolet absorber used include one or more of benzophenone-based, salicylic acid-based, PABA-based, dibenzoylmethane-based, cinnamate-based, etc., and the total compounding amount thereof is 0.1 to 30% by weight based on the total amount of the cosmetic. Is desirable.

Further, in the present invention, by adding a flaky titanium oxide or a titanium oxide composite, it is possible to exert the effect of preventing ultraviolet rays without impairing it. That is,
In general, foundations and the like are blended with titanium oxide for pigments having an average particle size of 0.1 to 0.5 μm in order to impart a covering power. It was found that there is a function of alienating the dispersion of ultraviolet rays by the fine particle titanium oxide of No. 2. On the other hand, the flaky titanium oxide and titanium oxide complex effectively enhance the ultraviolet ray prevention effect while imparting the covering power of the foundation, without impairing the ultraviolet ray dispersion by the first and second fine particle titanium oxide particles. You can

The flaky titanium oxide and titanium oxide composite have a size of about 1 to 10 μm and a thickness of about 0.1 to 1 μm.
The titanium oxide composite has a composition of, in addition to titanium oxide, silica, zirconia, alumina,
It contains one or more metal oxides such as iron oxide, cobalt oxide, and cerium oxide. The titanium oxide composite is more preferable than titanium oxide in terms of spreadability (spreading), adhesion (stickiness), and tactile sensation (smoothness). Examples of titanium oxide composites include, for example, flake titania in which fine particle silica is dispersed, Luxelen Silk-UV-.
S (Sumitomo Chemical Co., Ltd. product name) is mentioned. Further, these flaky titanium oxide and titanium oxide composite may be subjected to hydrophobic treatment such as silicone treatment, fluorine treatment, metal soap treatment and fatty acid treatment.
The desirable blending amount of the flaky titanium oxides is in the range of 3 to 30% by weight based on the total amount of the cosmetic. FIG. 4 is for a pigment when the base is an ordinary powder type foundation and the total amount of fine particle titanium oxide is 10% by weight (first fine particle titanium oxide: second fine particle titanium oxide = 1: 1). Relationship between the compounding amount of titanium oxide (% by weight) and SPF value (indicated by ● in the figure), and compounding amount (% by weight) of the flaky titanium oxide composite (luxelen silk-UV-S).
And the SPF value (indicated by a circle in the figure). It can be seen that the SPF value is higher when the flaky titanium oxide composite is used.

The cosmetic of the present invention includes an O / W type or a W / W type.
It includes O-type emulsified cosmetics and sunscreen agents, and also includes oily cosmetics and solid powder cosmetics. Further, in the cosmetics of the present invention, general components that are blended to form these dosage forms, for example, higher alcohols, lanolin derivatives, protein derivatives and fatty acid ester oils of polyethylene glycol, silicone oils. , Oil components such as paraffin oil, fluorine oil, moisturizer components such as propylene glycol, glycerin, polyethylene glycol, oil-soluble polymer substances, water-soluble polymer substances, ion-exchanged water, alcohol, talc, mica, kaolin, Iron oxide, powder such as spherical powder, preservative, bactericide, pH adjuster,
Antioxidants, pigments, fragrances and the like can be added as appropriate.

[0012]

EXAMPLES Next, the present invention will be described in detail with reference to examples. However, the present invention is not limited to this. Examples 1 to 5 and Comparative Examples 1 to 2 Solid powder cosmetics (powder foundation) having the composition shown in Table 1 below were prepared. The ultraviolet protection effect was measured by the SPF value whose measuring method is specified by the US FDA. The results are shown in Table 1.
As shown in Table 1, the cosmetics of the present invention exhibited a high UV protection effect.

[0013]

[Table 1]

Examples 6, 7 and Comparative Examples 3, 4 Emulsified cosmetics (makeup bases) having the composition shown in Table 2 below were prepared, and their SPF values were measured. The results are shown in Table 2. As shown in Table 2, the cosmetics of the present invention showed a high UV protection effect.

[0015]

[Table 2]

Examples 8 and 9, Comparative Examples 5 and 6 Emulsified cosmetics (sunscreen agents) having the composition shown in Table 3 below were prepared and their SPF values were measured. The results are shown in Table 3. As shown in Table 3, the cosmetics of the present invention showed a high UV protection effect.

[0017]

[Table 3]

Examples 10 to 13 and Comparative Examples 7 and 8 (cosmetics containing UV absorber) Solid powder cosmetics (foundation) having the composition shown in Table 4 below were prepared, and their SPF values were determined. It was measured.
The results are shown in Table 4. As shown in Table 4, the cosmetics of the present invention showed a high UV protection effect.

[0019]

[Table 4]

Examples 14 to 16 and Comparative Examples 9 and 10 (Cosmetics containing UV absorber) Oily cosmetics (liquid foundation) having the composition shown in the following Table 5 were prepared and their SPF values were measured. did. The results are shown in Table 5. As shown in Table 5, the cosmetics of the present invention showed a high UV protection effect.

[0021]

[Table 5]

Examples 17 to 19 and Comparative Examples 11 and 12 (cosmetics containing ultraviolet absorber) Emulsified cosmetics (sunscreen agents) having the composition shown in Table 6 below were prepared, and their SPF values were determined. It was measured. The results are shown in Table 6. As shown in Table 6, the cosmetics of the present invention exhibited a high UV protection effect.

[0023]

[Table 6]

Examples 20 to 23 and Comparative Examples 13 and 14 (cosmetics containing flaky titanium oxides) Solid powder cosmetics (foundation) having the composition shown in Table 7 below were prepared, and their SPFs were prepared. The value was measured.
The results are shown in Table 7. As shown in Table 7, the cosmetics of the present invention showed a high UV protection effect.

[0025]

[Table 7]

Examples 24 to 27, Comparative Examples 15 and 16 (cosmetics containing flaky titanium oxides) Oily cosmetics (foundations) having the composition shown in Table 8 below were prepared and their SPF values were determined. It was measured. The results are shown in Table 8. As shown in Table 8, the cosmetics of the present invention exhibited a high UV protection effect.

[0027]

[Table 8]

Examples 28 to 31, Comparative Examples 17 and 18 (Cosmetics containing flaky titanium oxides) Emulsified cosmetics (liquid foundation) having the composition shown in Tables 9 and 10 below were prepared, That SP
The F value was measured. The results are shown in Tables 9 and 10.
As shown in the table, the cosmetics of the present invention showed a high UV protection effect.

[0029]

[Table 9]

[0030]

[Table 10]

[0031]

As described above, the cosmetic material according to the present invention has a higher UV protection effect than ever before.

[Brief description of drawings]

FIG. 1 is a photograph, instead of a drawing, showing a particle structure of a first fine particle titanium oxide blended in a cosmetic of the present invention, as observed by an electron microscope.

FIG. 2 is a photograph, instead of a drawing, showing a particle structure of a second particulate titanium oxide compounded in the cosmetic of the present invention, as observed by an electron microscope.

FIG. 3 is a diagram showing the relationship between the SPF value and the compounding ratio of the first particulate titanium oxide and the second particulate titanium oxide.

FIG. 4 is an SPF when a flaky titanium oxide composite is used.
It is a figure which shows a value compared with the case where the titanium oxide for pigments is used.

Front Page Continuation (72) Inventor Shigenori Kumagai 1050 Shinba-cho, Kohoku-ku, Yokohama-shi, Kanagawa Shiseido Co., Ltd. Research Center 1 (56) Reference JP-A-2-212315 (JP, A) JP-A 64-- 7941 (JP, A) JP 62-36309 (JP, A) JP 1-143821 (JP, A) JP 5-221841 (JP, A) JP 63-126818 (JP, A) JP-A-61-293906 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61K ^7/ 00-7/50

Claims (4)

(57) [Claims] 1. The particle shape is close to a sphere, and the average particle diameter is 0.
A first fine particle titanium oxide having a particle size of 01 to 0.10 μm;
The particle shape is spindle-shaped and the minor axis is 0.005-0.02μ
m, the second fine particle titanium oxide having a major axis of 0.01 to 0.10 μm, and flaky titanium oxide or titanium oxide composite.
Containing a combination of the first fine particle titanium oxide and the second fine particle titanium oxide.
Fine particles of the first fine particles are the first fine particles in a weight ratio of titanium oxide.
Titanium oxide: second fine particle titanium oxide = 3: 1 to 1: 9
Cosmetic, characterized in that it is. 2. The mixing ratio of the first fine particle titanium oxide and the second fine particle titanium oxide is a weight ratio of the first fine particle titanium oxide: the second fine particle titanium oxide = 1: 1 to 1: 5. Cosmetics according to 1 . 3. A cosmetic composition according to claim 1 or 2 The total amount of the first and the fine particles of titanium oxide second fine particles of titanium dioxide is 3-30% of the total amount of the cosmetic. 4. A cosmetic according to any one of claims 1 to 3 containing an ultraviolet absorber.