JPS617207A - Cosmetic - Google Patents

Abstract

PURPOSE:A cosmetic that contains inorganic pigments which have been treated with a basic N-mono-long-chain acyl aminoacid on its surface, thus showing good compatbility in oil materials, high resistance to make-up collapse, improved safety with suppressed skin irritation. CONSTITUTION:Inorganic pigments such as talc, caolin, titanium dioxide, mica coated with titanium, iron oxide, silicic acid, ultramarine or clay are treated with a basic N-long-chain-acyl aminoacid which has an aliphatic acyl group of 8-22 carbon atoms in its molecule, on their surfaces and the resultant pigments are added to cosmetics. Examples of basic aminoacids are alpha,gamma-diaminobutyric acid, ornithine, lithine, arginine and hystidine and the long-chain acyl group is bonded to the amino group in the aminoacid in the alpha- or omega-position (where only alpha-position in arginine and hystidine). The amount of the aminoacid used is in range from 0.05-5wt% based on the inorganic pigments.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cosmetics containing improved inorganic pigments. Conventionally, inorganic pigments such as talc, kaolin, titanium dioxide, zinc white, iron oxide, and other inorganic pigments have been used in cosmetics. Cosmetics using these inorganic pigments include (1
) Covers the skin surface and hides spots and freckles, (2)
Excellent spreadability and smoothness when applied to the skin (3)
Excellent adhesion to the skin and prevents makeup from coming off (4)
) Good absorption of sweat and secretions, (5) Ingredients are mixed homogeneously and has a smooth feeling of use, (6) Highly safe.
Characteristics such as these are required.

However, because conventional inorganic pigments have a hydrophilic surface, they have poor miscibility and dispersion with oily base materials, making it difficult to obtain cosmetics with a uniform and smooth texture, and also causing problems when spread on the skin. It has the disadvantage that it does not have sufficient adhesion and easily comes off with sweat or water, causing makeup to come off easily. Furthermore, inorganic pigments have strong surface activity, which can promote the oxidation of oil-based ingredients used in cosmetics, producing peroxides that can cause skin irritation and deterioration of fragrances, resulting in safety and stability issues. Issues have also been raised in recent years. In order to solve this problem, various attempts have been made to incorporate surface-treated inorganic pigments into cosmetics, but a cosmetic that satisfies the above-mentioned characteristics has not yet been realized. For example, by treating the surface of inorganic pigments with silk fibrous, it is possible to improve their adhesion to the skin and oil absorption (Japanese Patent Publication No. 57-11).
No. 577) Silk fibroin is easily perishable, which may impair the appearance and fragrance of cosmetics, which is not desirable in terms of safety and stability. Alternatively, a method is known in which the surface of titanium dioxide is treated with a higher alcohol monoester of a long-chain fatty acid to make the surface hydrophobic and suppress the surface activity (Japanese Patent Publication No. 58-42167). Titanium dioxide is oily and has an unpleasant feel when applied to the skin, so the amount of titanium dioxide added to cosmetics is reduced to 1.
It is limited to about 2% to 2%, and there are significant restrictions on formulation.

Generally, a method is adopted in which the surface of an inorganic pigment is treated with a silicone oil such as I-siloxane to make the surface hydrophobic. However, silicone oil often has a characteristic odor, and the treated inorganic pigment is It is tacky and lacks smoothness, so cosmetics using it have an unfavorable feel when applied to the skin.

The present inventors have previously reported that long-chain acylated products of lysine, which is a type of basic amino acid, are useful as surface modifiers for inorganic materials. (Patent application 1986-175)
No. 708) treated inorganic pigments used in cosmetics with the long-chain acylated product of lysine, and found that the inorganic pigment was simply dispersed and mixed into the oil-based raw material. It has been found that the present invention not only improves the properties of cosmetics, but also significantly improves the properties required for cosmetics, such as adhesion to the skin, safety, stability, and texture. Furthermore, similar effects are achieved not only with mono-long chain acylated products of lysine, but also with inorganic pigments treated with mono-long chain acylated products of other basic amino acids, such as ornithine, α, γ-noaminobutyric acid, arginine, and histidine. The inventors discovered that the same effect was obtained in cosmetics containing untreated inorganic pigments or inorganic pigments that had been surface-treated using conventionally known techniques. did. That is, the present invention relates to a cosmetic product characterized in that an inorganic pigment surface-treated with an N-mono long chain acyl basic amino acid is blended with the inorganic pigment of the present invention. Inorganic pigments used in the cosmetics of the present invention include talc, kaolin, titanium dioxide, titanium-coated mica, @matrix, iron oxide, 9 ultramarine silicate, navy blue, zinc white, clay, precipitated calcium carbonate, etc. The shape and size of the particles are not particularly limited. The basic amino acids constituting the N-mono long chain acyl basic amino acids in the present invention include α
, γ-diaminobutyric acid, ornithine, linone, arginine, and histidine, which may be optically active or racemic. The long-chain acyl group is a saturated or unsaturated straight-chain or branched aliphatic acyl group having 8 to 22 carbon atoms, whether of single chain length or mixed chain length. good. Specifically, 2-ethylhexanoyl, capryloyl, cacilloyl, lauroyl, myristoyl, and mother lumitoyl.

Examples include stearoyl, instearoyl, on-oil, pehenoyl, cocoyl, beef tallow fatty acid acyl, and hydrogenated beef tallow fatty acid acyl. The binding site of a long-chain acyl group to a basic amino acid is the amino group at the α-position or the amino group at the ω-position, but in the case of arginine and histidine, it is limited to the amino group at the α-position. Specific examples include N1-2-ethylhexanoyl lysine, Ne-lauroyl lysine H&
- cocoyl lysine, N'-z4 lumitoyl lysone,
N6-Instearoylrinone w6-Hydrogenated beef tallow fatty acid acyl lysine, Na-Capryloyl lysine, N"-Lauroyl lysine, Na-Myristoyl lysine, Na-Oleoyl lysine, Na-Hehenoyl lysone, Nδ-Cocoyl ornithine, Na-stearoyl ornithine, Na −
Beef tallow fatty acid acylornithine N (2-2-ethylhexanoyl ornithine H (X-lauroyl ornithine).

Na-(sostearoylornithine, Nγ-A?lumitoyl-α, γ-diaminobutyric acid, N“-tallow fatty acid acyl-α, γ-noaminobutyric acid, Na-power! loylarginine.

N''-lauroyl arginine, Na--mother lumitoyl arginine, Na-hardened beef tallow fatty acid azilarginine, N
-Cocoylhistidene, Na-isostearoylhistidene, etc., but are not limited to these examples, of course.

When treating inorganic pigments, the ratio of the N-mono long chain acyl basic amino acid to the inorganic pigment is preferably 0.05 to 5% by weight; Even if the amount exceeds 5% by weight, the treatment effect will not improve much, so there will be no economic advantage.Additionally, other surface treatments may be used in combination if necessary.

Either a dry method or a wet method can be employed as a method for treating pigments. The dry method is simple and effective, and involves stirring and mixing a fine powder of N-monolong chain acyl basic amino acid, that is, a powder with an average particle size of 0.1 to 10μ, preferably 0.1 to 5μ, with an inorganic pigment. Alternatively, the surface of the inorganic pigment can be easily treated by mixing the N-mono long chain acyl basic amino acid and the inorganic pigment and then co-pulverizing the mixture. Alternatively, a wet method may be employed to obtain a treatment effect using a smaller amount of N-mono long chain acyl basic amino acid.

In this case, N-monolong chain acyl basic amino acids are hardly soluble in near-neutral water and oil-based raw materials commonly used in cosmetics, so calcium chloride is used as a solubilizer to
- The surface of the inorganic pigment can be effectively modified by dissolving the mono-long chain acyl basic amino acid in an organic solvent, bringing it into contact with the inorganic pigment, washing with water to remove calcium chloride, and drying. Alternatively, an N-mono long chain acyl basic amino acid is dissolved in acidic or alkaline water or an aqueous solvent and brought into contact with the inorganic pigment, and then neutralized to near neutrality to form an N-mono long chain acyl base on the pigment surface. A similar surface treatment effect can be obtained by precipitating and adhering a synthetic amino acid, removing salts generated by neutralization by washing with water, and drying.

Cosmetics containing inorganic pigments that have been surface-treated with N-mono long-chain acyl basic amino acids in this way have many advantages that cannot be found in cosmetics that contain inorganic pigments that have been treated with untreated or conventionally known techniques. It has the following advantages. In other words, (1) the inorganic pigment has excellent dispersion and miscibility with the oil-based raw material, so the product has a homogeneous and smooth feel with no roughness; (2) it has excellent adhesion to the skin and does not easily come off; (3) ) Since the surface activity of inorganic pigments is suppressed, less peroxide is produced, and skin irritation derived from peroxides is suppressed, resulting in excellent safety. (4) There is less deterioration of fragrances, and product quality is improved. (5) Unlike silk fibroin, N-mono long chain acyl basic amino acids have antibacterial properties and are therefore less susceptible to microbial contamination; (6) Cosmetics containing inorganic pigments treated with silicone oil are However, the cosmetic of the present invention does not have a sticky feel, has a smooth feel, and spreads well on the skin. As described above, the cosmetic composition of the present invention overcomes the problems that have not been solved in the past, and is therefore extremely desirable.

Hereinafter, the present invention will be explained in detail with reference to examples, but the present invention is of course not limited to these examples.

Example 1 A mixture of N1-·f-lumitoyl lysine and N"-cocoyl arginine having an average particle size of 2μ (weight ratio 1:
1) 3 parts by weight were added and stirred and mixed for 10 minutes using a Henshil mixer to perform surface treatment.

Component B was added to this surface-treated component A and the internal temperature was raised to 6.
After stirring and mixing for 15 minutes in a Henshil mixer kept at 0°C, the mixture was cooled to 40°C, taken out, and molded into a product. In the product, the inorganic pigment of component A was homogeneously mixed with component B, and the product had a smooth feel with no roughness when applied.

Next, apply this product II to a petri dish with a diameter of 4.

It was irradiated with xenon run f (Takashi Xenon Tester Model XF-608) from a distance of 1 m for 2 hours. The soluble content was eluted with normal hexane, and the amount of peroxide produced in the eluate was measured. The peroxide value of this product after irradiation with a xenon lamp was 6.5. For comparison, component A was treated with 3 parts by weight of magnesium stearate, and the resulting eye shadow was prepared in the same manner as above, and the resulting eye shadow was irradiated with a xenon lamp under the same conditions, and the amount of peroxide produced was measured. The peroxide value after opening was 17.7. As described above, the eyeshadow of the present invention suppresses the production of peroxide and is excellent in terms of safety.

Example 2 50.9 g of calcium chloride is dissolved in white powder ethanol 2500F, and 2.5 g of N6-lauroyl lysine is dissolved therein. A mixture of talc 801 and zinc white (5 g) was added, and the mixture was stirred at room temperature for 2 hours. The mixture of talc and zinc white was washed thoroughly with water to remove calcium chloride, and then dried under reduced pressure at 80° C. for a day and a night. The amount of N'-lauroyl lysine remaining in the furnace liquid and cleaning liquid was determined by liquid chromatography, and the amount of N1-lauroyl lysine adsorbed on the mixture of talc and zinc white was 0.35 g. Using the talc and zinc white treated in this way, powdered white powder having the following composition was prepared.

A, Talc treated with N'-lauroyl lysine
80 parts by weight B, zinc white treated with N'-lauroyl lysine 5 #Potato Denzon
5 parts by weight Zinc stearate 3N Fragrance 0.1 # Furthermore, as a comparative example, the same weight parts of untreated talc in place of A and untreated zinc white in place of B were used in the above formulation amounts. was prepared and evaluated by 15 women in their 20s to 40s, and the following results were obtained.

From the above results, it can be seen that the white powder of the present invention has better adhesion to the skin than the white powder of the comparative example, and has good adhesion even when sweating.Example 3 Solid Foundation Fragrance 0.2
Component A was mixed for 10 minutes using a Henshil mixer, and component B was added thereto and mixed with stirring for an additional 10 minutes to perform surface treatment.

Component C was added to the surface-treated component A, stirred and mixed for 20 minutes, and then perfume was added at a temperature below 35°C, followed by a further 10 minutes.
The mixture was mixed for a minute, taken out, and molded with Soles to prepare a solid foundation. This product was homogeneous, had a smooth feel without stickiness, spread well when applied to the skin, and had good adhesion to the skin.

Claims (1)

[Claims] 1. One aliphatic acyl group having 8 to 22 carbon atoms in the molecule.
1. A cosmetic comprising an inorganic pigment whose surface has been treated with an N-mono long chain acyl basic amino acid. 2. N-mono long chain acyl basic amino acids are N^α-long chain acyl lysine, N^δ-long chain acyl lysine, N^α-long chain acyl ornithine, N^δ-long chain acyl ornithine,
N^α-long chain acyl-α,γ-diaminobutyric acid, N^γ-
The cosmetic according to claim 1, which is selected from long-chain acyl-α,γ-diaminobutyric acid, N^α-long-chain acyl arginine, and N^α-long-chain acylhistidine.