JPS6248642B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is obtained by adsorbing rhodamine B, polyvalent metal ions, and water-soluble polymers to clay minerals.
The present invention relates to cosmetics, particularly make-up cosmetics, obtained by blending a red colored pigment with a yellowish hue into a cosmetic base. Conventionally, various attempts have been made in the industry to turn Rhodamine B, a cationic dye, into a pigment and use it in cosmetics, particularly make-up cosmetics. For example, a pigment in which rhodamine B is bonded to a clay mineral having cation exchange ability is known. However, although this product does not stain the skin, it has a bluish-red color tone, and it also has a new drawback that the saturation is low, which destroys the vivid color tone that Rhodamine B originally has. ing. Therefore, when this product is used in cosmetics, it has low chroma and cannot produce the reddish tinge required for cosmetics, especially makeup cosmetics, so it cannot be used in practice. Furthermore, a red pigment composition obtained by bonding rhodamine B whose hue has been adjusted with a surfactant and polyvalent metal ions to a clay mineral having cation exchange ability is also known. However, although this pigment has excellent color effects and does not stain the skin, it has a strong blue tint and lacks yellow tint for use in cosmetics, especially make-up cosmetics. cannot be incorporated into cosmetics. Furthermore, among the surfactants used as conditioning agents, nonionic surfactants are relatively less irritating, but they cannot be said to be without risks in terms of safety to the skin. As a result of intensive research to improve these drawbacks, the present inventors have found that they have been able to compensate for various drawbacks by treating the skin with mainly water-soluble polymers that have no safety issues at all. The present inventors have discovered a cosmetic material using a red colored pigment adjusted to have a yellowish tinge, and have completed the present invention. That is, the present invention is characterized by blending a red colored pigment with a yellowish hue obtained by adsorbing rhodamine B, polyvalent metal ions, and water-soluble polymers to clay minerals having cation exchange ability. The purpose of the present invention is to provide cosmetics that have the following properties. Next, the colored pigment used in the present invention will be explained. The water-soluble polymer used as a treatment agent may be a natural product or a synthetic product. For example, animal-based polymers such as gelatin and casein, starches, plant-based polymers such as plant gums, seaweeds, and plant mucilages, microbial polysaccharides such as Keltrol, methylcellulose, carboxymethylcellulose sodium salt, and hydroxyethylcellulose. Examples include cellulose derivatives such as, polyvinyl alcohol, polyvinylpyrrolidone, vinyl polymers such as polyacrylic acid derivatives, polymethacrylic acid derivatives, and polyethylene oxide. The appropriate amount of the water-soluble polymer to be blended is 1 to 50% based on the clay mineral in order to obtain a red pigment with the desired yellow tint. As clay minerals, montmorillonite, hectorite, zeolite, kaolin, hallosite, illite, etc., all of which have cation exchange ability, are possible, but Laponite CP, which is a synthetic product, has an excellent physical constitution because it is a white powder. It is something. Polyvalent metal salts include calcium, barium, zinc,
Hydrochlorides, hydrochlorides, etc. of manganese, aluminum, magnesium, etc. are used. The colored pigment used in the present invention can be obtained by any of the following methods. (1) Clay minerals are gradually dispersed into an aqueous Rhodamine B dye solution prepared in advance, and the mixture is stirred until uniformly swollen, and then treated with a water-soluble polymeric substance. Thereafter, when the material is further treated with a polyvalent metal, non-swellable pigments precipitate. (2) Gradually disperse the clay mineral into an aqueous rhodamine B dye solution prepared in advance and continue stirring until it swells uniformly, then treat it with a polyvalent metal,
Then, by treatment with a water-soluble polymeric substance, a colored pigment that does not stain the skin but has excellent color effects is obtained. Next, the synthesis method will be explained using a specific example. Synthesis Example 1 10 g of Laponite CP was previously dispersed in 500 ml of water until it became homogeneous, and a separate solution of 500 ml of a 0.2% rhodamine B dye aqueous solution was added to the above dispersion. After stirring this at 50°C for 30 minutes, 0.5 g of polyvinylpyrrolidone was added, and the mixture was further stirred with calcium chloride at 50°C for 30 minutes. The precipitated and separated non-swelling colored pigment was filtered, washed with water, dried and pulverized to obtain the desired pigment. Synthesis Example 2 Add 500 ml of 0.2% Rhodamine B dye aqueous solution to a solution in which 10 g of Laponite CP is uniformly dispersed in 500 ml of water.
was added and stirred at 50°C for 30 minutes. Then, calcium chloride was added, and then 0.5 g of polyvinylpyrrolidone was added, followed by stirring at 50°C for 30 minutes. The target pigment was obtained in the same manner as in Synthesis Example 1. Next, the characteristics of the pigment used in the present invention will be shown. Prior to that, the visible spectrum was measured when 0.5 g of water-soluble polymer was added to 500 ml of 0.2% rhodamine B aqueous solution, and the change in the dominant wavelength is shown in Table 1.

[Table] From Table 1, it is clear that the dominant wavelength of the water-soluble polymer-added product shifts to the shorter wavelength side compared to the additive-free product, and the color tone adjustment effect changes from bluish red to yellowish red. It's showing up. The color tone, coloring power, and bleedability into water of the colored pigment obtained according to Synthesis Example 1 are shown below. The color tone of the coloring pigment can be determined by using the pigment powder itself, and for the coloring power, a certain amount of castor oil is added to a certain amount of the coloring pigment, titanium oxide is added as appropriate to the coloring pigment, and the mixture is kneaded with a doctor blade. ,
A constant coating was applied onto a hiding rate test paper. This is measured using a spectrophotometer (Hitachi Color Analyzer).
607 type), and the obtained X, Y, Z are HV
C Convert to Munsell value and further express coloring power
Substituted into Godlove's concentration formula S=√16 ² + ² . Here, (=10-V) corresponds to darkness, and the larger the S value is, the greater the coloring power is. Regarding the bleeding property, 1 g of the colored pigment was collected, diluted to 100 g with water, stirred and left to stand for 1 hour, and the supernatant liquid was passed through the mouth and the absorbance (ε) was measured using a Hitachi 340 self-recording spectrophotometer. The above results are summarized in Table 2 for the powder color of the colored pigment.
In addition, the bleed properties are shown in Table 3, and the tinting power is shown in Figure 1.

【table】

[Table] As is clear from Tables 2 and 3, the hue becomes more yellowish and the pigmentation is improved by the water-soluble polymer treatment, and it is a good pigment with no bleeding properties. Furthermore, as is clear from FIG. 1, the coloring power is higher than that of the product without water-soluble polymer additives. Note that almost the same results were obtained with the colored pigment obtained according to the method of Synthesis Example 2. Next, examples of the present invention will be shown. (Amounts shown are parts by weight.) Example 1 A solution of 10 g of Rhodamine B dissolved in 1 part of water was added to a solution of 100 g of montmorillonite uniformly dispersed in 5 parts of water, and the mixture was stirred at 50°C for 30 minutes. . Thereafter, 300 ml of a solution containing 0.5 g of polyvinylpyrrolidone dissolved therein was added, followed by 100 ml of 0.2 N calcium chloride, and the mixture was stirred at 50° C. for 30 minutes. The precipitate was filtered, washed with water, dried, and pulverized to obtain a colored pigment. The resulting pigment was incorporated into nail enamel. Nitrocellulose (1/2 second) 10.0 Alkyd resin 10.0 Acetyl tributyl citrate 5.0 Ethyl acetate 20.0 Butyl acetate 15.0 Ethyl alcohol 5.0 Toluene 35.0 Color pigment Appropriate amount Suspension inhibitor Example 2 100 g of Laponite CP was uniformly dispersed in 5 water. A solution prepared by dissolving 20 g of Rhodamine B in 1 was added thereto, and the mixture was stirred at 50°C for 30 minutes. Next, 100 ml of 0.2N aluminum chloride was added, and then 100 ml of a solution containing 0.5 g of carboxymethylcellulose sodium salt was added, and 50 ml of aluminum chloride was added.
C. and stirred for 30 minutes. A pigment was obtained in the same manner as in Example 1. The resulting pigment was blended into lipstick. Carnauba wax 16.0 Ozokerite 16.0 Lanolin 24.0 Liquid paraffin 24.0 Butyl stearate 10.0 Color pigment 6.0 Titanium oxide 4.0 Fragrance Appropriate amount Antioxidant

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the tinting strength of the colored pigment used in the present invention and a comparative colored pigment.

Claims (1)

[Claims] 1. A cosmetic containing a red colored pigment whose hue is adjusted to yellow, which is obtained by adsorbing Rhodamine B, polyvalent metal ions, and water-soluble polymers to clay minerals having cation exchange ability. .