JPH04292664A - Complex pigment and cosmetic containing the same - Google Patents

Abstract

PURPOSE:To obtain the subject pigment, excellent in saturation and dispersibility and useful as coatings, etc., by applying a (sulfotolylazo)hydroxynaphthoate to the surface of inorganic powder, etc., having a specific average particle diameter and specified refractive index. CONSTITUTION:The objective pigment is obtained by applying a 4-(o-sulfo-p- tolylazo)-3-hydroxy-2-naphthoate to the surface of inorganic powder such as silica or organic powder such as PE having 0.2-100mum average particle diameter and 1.3-2.8 refractive index. Furthermore, the blending ratio of the powder to the pigment is preferably (1/10)-(100/1). A cosmetic containing the aforementioned pigment is excellent in saturation.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite pigment that has a higher chroma than that of a single pigment, and a cosmetic containing the composite pigment that has a high chroma.

0002

[Prior art and problems to be solved by the invention] Conventionally,
Many compounds are known as pigments, and these are used as colorants for paints, printing inks, rubbers, plastics, synthetic resins, cosmetics, etc., depending on their properties.

When pigments are used in cosmetics, especially makeup cosmetics such as lipstick, they are required to have high chroma, and in order to improve the chroma, conventional methods have been to reduce the particle size of the pigment. Methods such as mixing well with oil and oil were used. However, 4-(o-sulfo-p-tolylazo)-3-hydroxy-2-naphthoate (monosodium salt is "lysol rubine B", calcium salt is "
With conventional methods, the pigments re-agglomerate or come close to each other, making it impossible to obtain an optically sufficient pigment dispersion state.
It was not possible to fully exhibit the chroma of this pigment.

[0004] On the other hand, there has been an attempt to improve the dispersibility in a dispersion medium by compounding pigments (Japanese Patent Laid-Open No. 187459/1983), but this report only describes an example of compounding inorganic pigments. There were no examples of compounding organic pigments, and furthermore, there was no study at all about how chroma changes due to compounding pigments.

[0005]

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present inventor has conducted extensive research on changes in chroma due to compounding of organic pigments, and has found that 4-(o-
If sulfo-p-tolylazo)-3-hydroxy-2-naphthoate is attached and composited, the chroma will be improved compared to the case of the pigment alone, and furthermore, if this composite pigment is blended, the chroma will be improved. discovered that it is possible to obtain cosmetics with high
The invention has been completed.

That is, in the present invention, the average particle size is 0.2
4-(o-sulfo-p-
The present invention provides a composite pigment characterized in that tolylazo)-3-hydroxy-2-naphthoate is attached thereto, and a cosmetic containing the same.

The inorganic or organic powder that forms the core of the composite pigment of the present invention has a particle size of 0.2 to 100 μm. This particle size is a volume average particle size determined by laser diffraction using an appropriate dispersion medium. If this particle size is less than 0.2 μm, an optically sufficient pigment dispersion state cannot be obtained, and if it exceeds 100 μm, a composite pigment with sufficient coloring power cannot be obtained, which is not preferable. The refractive index of the core powder is 1.3 to 2.8, preferably 1.3 to 1.7. Refractive index is 1.3-2.8
If a powder outside the range is used, 4-(o-sulfo-p-
This is not preferable because it changes the color of tolylazo-3-hydroxy-2-naphthoate. Examples of powders having a refractive index within the above range include silica, nylon, polyethylene, polymethyl methacrylate, polystyrene,
Examples include barium sulfate, aluminum oxide, zinc oxide, titanium oxide, mica, titanium mica, and the like.

[0008] Furthermore, as the pigment 4-(o-sulfo-p-tolylazo)-3-hydroxy-2-naphthoate, which is the pigment to be attached to the surface of the powder, its monosodium salt (hereinafter referred to as ``lysolrubin B'') is used. ) or its calcium salt (hereinafter referred to as "lysol rubine BCA") is preferred. The blending ratio of the core powder used in the present invention and the above pigment is preferably 1:25 to 1000:1, particularly preferably 1:10 to 100:1. Moreover, these composites can be performed by mixing the core powder and the pigment using a mixer such as a rotary ball mill, a vibrating ball mill, or a hybridizer.

The composite pigment of the present invention obtained in this way may have the pigment attached to a part of the surface of the core powder, but it may be attached uniformly to the entire surface of the powder. It is desirable to be present. Note that this adhesion state can be confirmed using a scanning electron microscope.

The composite pigment of the present invention can be widely used in the fields of paints, inks, cosmetics, etc. For example, in the case of cosmetics, it can be applied to makeup cosmetics such as foundation, blusher, eye shadow, lipstick, nail polish, eyeliner, eye pencil, etc., and can be in the form of powder, cake, emulsion, etc. It can be used in a wide range of forms, including oil and gel. The composite pigment of the present invention can be blended into the cosmetic of the present invention in the same manner as conventional pigments, and the amount to be blended can be arbitrarily selected depending on the type of cosmetic. .005-99.9% by weight, especially 0.0
1 to 90% by weight is preferred.

[0011]

[Example] The following is a more detailed explanation with reference to an example.
The present invention is not limited to these.

Example 1 Nuclear powder (nylon spheres, particle size 5 μm, refractive index 1.52)
and an organic pigment (Resol Rubin B) in a ratio of 4:1, and the core powder and organic pigment were combined at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed is 60 revolutions/minute,
Mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly covered with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper Mahler, color measurement was performed. As a result, the saturation (Munsell chroma) was lower than when simply kneading the same amount of nylon spheres, organic pigment, and castor oil.
0.7 improved.

Example 2 Nuclear powder (polyethylene spheres, particle size 5 μm, refractive index 1.5
1) and an organic pigment (Rysol Rubin B) at a ratio of 4:1, the core powder and the organic pigment were composited at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed was 60 rpm, and mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly covered with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper muller,
Color measurement was performed. As a result, simply the same amount of polyethylene spheres
The saturation (Munsell chroma) was improved by ΔC=1.1 compared to the case where organic pigment and castor oil were kneaded.

Example 3 Core powder (spherical silica, particle size 5 μm, refractive index 1.47)
and an organic pigment (Resol Rubin B) in a ratio of 4:1, and the core powder and organic pigment were combined at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed is 60 revolutions/minute,
Mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly coated with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper Mahler, color measurement was performed. As a result, the saturation (Munsell chroma) was lower than when simply kneading the same amount of spherical silica, organic pigment, and castor oil.
0.1 improved.

Example 4 Nuclear powder (nylon spheres, particle size 5 μm, refractive index 1.52)
and an organic pigment (Resol Rubin B) in a ratio of 1:1, and the core powder and the organic pigment were composited at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed is 60 revolutions/minute,
Mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly covered with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper Mahler, color measurement was performed. As a result, the saturation (Munsell chroma) was lower than when simply kneading the same amount of nylon spheres, organic pigment, and castor oil.
1.5 Improved.

Example 5 Nuclear powder (nylon spheres, particle size 5 μm, refractive index 1.52)
and an organic pigment (Resol Rubin B) in a ratio of 9:1, and the core powder and organic pigment were combined at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed is 60 revolutions/minute,
Mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly covered with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper Mahler, color measurement was performed. As a result, the saturation (Munsell chroma) was lower than when simply kneading the same amount of nylon spheres, organic pigment, and castor oil.
0.7 improved.

Example 6 Nuclear powder (nylon spheres, particle size 5 μm, refractive index 1.52)
and an organic pigment (Lysol Rubin BCA) in a ratio of 4:1, and the core powder and the organic pigment were composited at room temperature using a rotary ball mill. The mixing media were 3 mm and 10 mm ceramic balls. The rotation speed was 60 rpm, and mixing was performed for 120 minutes. It was confirmed using a scanning electron microscope that the core powder of the obtained composite pigment was almost uniformly covered with the organic pigment. After kneading this composite pigment with castor oil (dispersed oil agent) in a Hooper muller,
Color measurement was performed. As a result, the saturation (Munsell chroma) was improved by ΔC=0.5 compared to the case where the same amounts of nylon spheres, organic pigment, and castor oil were simply kneaded.

Example 7 Lipstick (composition)
Weight%1 Carnauba wax
2 2 Ceresin

8 3 Candelilla wax
3 4 Microcrystalline wax
2 5 Beeswax
3 6
hydrogenated palm oil
5 7 Lanolin

5 8 Castor oil

40 9 Jojoba oil
2
4 10 Pigment (composite pigment of Example 1)
8 11 Antioxidants

Appropriate amount (manufacturing method) The above ingredients were heated and dissolved, mixed uniformly, poured into a mold, cooled and solidified to produce a lipstick.

[0019]

[Effect of the invention] The composite pigment of the present invention has higher chroma than when the pigment is dispersed alone or when the pigment and powder are mixed. can get.

Claims (2)

[Claims] [Claim 1] Average particle size is 0.2 to 100 μm.
4-(o-sulfo-p-tolylazo)- on the surface of an inorganic or organic powder with a refractive index of 1.3 to 2.8.
A composite pigment characterized by having 3-hydroxy-2-naphthoate attached thereto. 2. A cosmetic containing the composite pigment according to claim 1.