JP2001151621A - Skin cosmetic having reversible color-changing property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin cosmetic having a reversible color-changing property and a color-changing composition for hair, capable of reversibly changing its color in accordance with the kinds of outside light source and having a large color tone change. SOLUTION: This skin cosmetic having a reversible color-changing property is characterized by blending fine particles of rare earth oxides expressed by the general formula: M2O3 (wherein, M is Ho, Nd or Pr) having mean particle diameter within 5-200 nm range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin cosmetic having reversible discoloration, which provides a skin cosmetic whose color reversibly changes in accordance with the type of an external light source and whose color tone changes largely. It is.

[0002]

2. Description of the Related Art Conventionally, skin cosmetics such as foundations, lipsticks, and eye shadows are colored with general coloring agents, and coloring agents capable of displaying a special interference color such as titanium oxide-coated mica are also available. Although it was used, the coloration state did not differ depending on the type of light source, and the expression was poor.

[0003]

Therefore, the present inventor has proposed:
It is an object of the present invention to provide a skin cosmetic which can change the coloration state of a fluorescent lamp in a three-wavelength range in the sun and indoors, has a large change in color tone, and can express a color that cannot be obtained with conventional materials.

[0004]

The present invention SUMMARY OF] is average particle diameter is 5 to 200 nm, preferably the general formula M ₂ 0 ₃ is in the range of 10 to 100 nm (where, M is Ho, Nd or P
The present invention provides a skin cosmetic having reversible discoloration characterized by incorporating rare earth oxide ultrafine particles represented by the following formula:

The rare earth oxide ultrafine particles of the present invention have a different reflection spectral distribution from the conventional rare earth oxide fine particles having an average particle diameter of the order of several μm. As an example, a conventional average particle diameter comparing reflected spectral distribution of Ho ₂ O ₃ ultrafine particles the average particle size and the reflection spectral distribution of Ho ₂ O ₃ fine particles of about 2μm is 30 nm, 460 nm regardless of the particle size,
The fine particles have a major absorption peak in the wavelength range around 540 nm and 650 nm. In particular, the absorbance in the wavelength range around 540 nm and 650 nm is less than 50% for the fine particles, whereas the absorption ratio for the ultrafine particles is 70 to 80%. Which shows extremely large absorption, and the absorptivity in the wavelength region of these two absorption peaks is significantly different.

As a result, 490 nm, 550 nm, 62
When Ho ₂ O ₃ particles are illuminated to a three-wavelength emission fluorescent lamp having a large emission line near 0 nm, the Ho ₂ O ₃ ultrafine particles absorb more wavelengths around 540 nm and 650 nm, and the three-wavelength emission fluorescent light Since the emission line near 620 nm contained in the lamp is reflected, the color tone of the Ho ₂ O ₃ ultrafine particles becomes stronger in red, and as a result, a deep pink color can be expressed.

[0007]

Embodiments of the present invention will be described with reference to the following examples.

The skin cosmetic of the present invention has an average particle system of 5 to 5.
General formula M in the range of 200 nm _TwoO_Three(However, M
Represents Ho, Nd or Pr).
Ultra fine particles are blended. In addition, the above rare earth oxides
General coloring agents are also included in skin cosmetics containing fine particles
can do. By doing so, rare earth oxidation
And Coloring of Colorants Due to Absorption Peaks of Ultrafine Particles
Color variation is possible by the combination of
You.

The skin cosmetics of the present invention include foundations, lipsticks, lip balms, eye shadows and the like. The composition of the present invention varies depending on the use, and for example, any dosage form such as liquid, cream, powder, gel, and solid can be used. The amount of the ultrafine rare earth oxide particles used in the present invention is arbitrarily selected depending on the type of the cosmetic, but is preferably 5 to 95% by weight, preferably 10 to 80% by weight in the cosmetic. Range.

[0010]

EXAMPLES [Creamy Skin Cosmetic] Example 1 90 parts by weight of water, 9 parts by weight of propylene glycol and 1 part by weight of triethanolamine based on 30 parts by weight of ultrafine Ho ₂ O ₃ particles having an average particle diameter of 30 nm. Was blended to produce an aqueous dispersion component. Next, 25 parts by weight of petrolatum, 30 parts by weight of liquid paraffin, 15 parts by weight of stearic acid, 10 parts by weight of cetyl alcohol, 10 parts by weight of polyoxyethylene monostearate, and sorbitan monostearate 1
0 parts by weight were dissolved by heating, and the heated aqueous dispersion component was added to emulsify to obtain a creamy skin cosmetic. When this skin cosmetic is applied to the skin and exposed to sunlight, it is almost the same as the uncoated part, and when viewed under a fluorescent light of standard light source D65, exhibits a slightly pink color. When viewed below, it appeared dark pink.

Example 2 A creamy skin cosmetic was obtained in the same manner as in Example 1 except that 1 part by weight of a blue pigment was added to the skin cosmetic of Example 1 together with Ho ₂ O ₃ ultrafine particles. When this skin cosmetic is applied to the skin and exposed to sunlight, it exhibits a blue color, exhibits a blue-purple color when viewed under a fluorescent light of standard light source D65, and exhibits a purple color when viewed under a three-wavelength band fluorescent lamp. did.

Example 3 A creamy skin cosmetic was obtained in the same manner as in Example 1 except that 1.5 parts by weight of a yellow pigment was added to the skin cosmetic of Example 1 together with Ho ₂ O ₃ ultrafine particles. . When this skin cosmetic is applied to the skin and exposed to sunlight, it exhibits a yellow color, a pale orange color when viewed under a fluorescent light of standard light source D65, and an orange color when viewed under a fluorescent light source of three wavelength range. Was presented.

Example 4 The skin cosmetic of Example 1 had an average particle size of 30 nm.
Instead of Ho ₂ O ₃ ultrafine particles
A creamy skin cosmetic was obtained in the same manner as in Example 1 except that ultrafine Pr ₂ O ₃ particles having a thickness of 0 nm were used. When this skin cosmetic is applied to the skin and exposed to sunlight, it is almost the same as the uncoated part, and exhibits a pale yellow-green color when viewed under a fluorescent light of the standard light source D65. When viewed below, it exhibited a dark yellow-green color.

[Powder-like Skin Cosmetic] Example 5 17 parts by weight of talc, 25 parts by weight of mica, 5 parts by weight of zinc stearate and nylon with respect to 30 parts by weight of ultrafine Ho ₂ O ₃ particles having an average particle diameter of 30 nm -12 powder 15
Parts by weight, ground and mixed, 4 parts by weight of liquid petrolatum and 4 parts by weight of isopropyl myristate are added, and ground again to form a powder, and then placed in a metal dish and pressed to obtain a powdery skin cosmetic. Was. This skin cosmetic was applied to the skin with a brush, and when exposed to the sun's rays, it was almost the same as the uncoated part. It looked pink under fluorescent light.

Example 6 The skin cosmetic liquid of Example 5 had an average particle size of 30 n.
Instead of Ho ₂ O ₃ Ho2 O3 ultrafine particles is m, the average particle diameter except using Nd ₃ O ₃ ultrafine particles is 30nm in the same manner as in Example 1 to obtain a powdery skin cosmetic . The skin cosmetic was applied to the skin with a brush, and when exposed to sunlight, it exhibited a pale mauve color and a deep blue color when viewed under a standard light source D65 fluorescent lamp and a three-wavelength region fluorescent lamp.

Example 6 [Solid Skin Cosmetic] Example 6 Diisostearyl malate, Octyldodec myristate
70% of base component mainly composed of cellulose and solid paraffin
In the parts by mass, Ho having an average particle diameter of 30 nm is used._TwoO _ThreeUltrafine
And 25 parts by weight of mica and 5 parts by weight of mica
And further uniformly mixed with a roll mill. This is heated and melted
After pouring into a mold and cooling, remove from the mold and solid lipstick
A type of skin cosmetic was obtained. Painted commercial white lipstick
When I applied the above skin cosmetics on my lips,
When exposed to light, it remained white, but the standard light source D65
When viewed under a fluorescent light, it has a pale pink color and three wavelengths
When viewed under an area-emission fluorescent lamp, it exhibited a deep pink color.

[0017]

As described above in detail, according to the present invention, it is possible to exhibit a large color change in an environment with different light sources, and the ultrafine particles of the present invention greatly change the color tone. It is possible to express change. In addition, the color change is due to the absorption and reflection characteristic of rare earth oxides, so the reversibility of the color change is perfect, the speed of the color change is fast, and there is no light deterioration, so the quality such as weather resistance and heat resistance is good. There are advantages. Furthermore, there is an advantage that a color variation is possible by a combination with a coloring agent to be blended in the skin cosmetic or by applying a layer on the color of the base cosmetic.

Claims (1)

[Claims] The general formula M ₂ O _{3 wherein the} average particle system is in the range of 5 to 200 nm (where M is Ho, Nd or Pr)
The skin cosmetic has reversible discoloration, characterized in that it contains rare-earth oxide ultrafine particles represented by the following formula: