JPH1045523A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic having such characteristics that blots and other troubles on skin become unnoticeable and that uniform finish feeling of skin can be obtained. SOLUTION: This cosmetic is obtained by surface-processing a mixture of lamellar barium sulfate and iron-containing titanium dioxide particulates with an N-acylated lysine to substantially fix the iron-containing titanium dioxide particulates on the surfaces of the lamellar barium sulfate. The cosmetic is also obtained by surface-processing a mixture of lamellar barium sulfate and iron-containing titanium dioxide particulates having average primary particle size of 5-100nm at a ratio of (95:5) to (30:70) with methylhydrogenpolysiloxane to substantially fix the iron-containing titanium dioxide particulates on the surfaces of the lamellar barium sulfate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetic containing a modified powder characterized in that iron-containing fine particle titanium oxide is substantially fixed on the surface of barium sulfate.
More specifically, a modification obtained by surface-treating a mixture of plate-like barium sulfate and iron-containing fine particle titanium oxide having an average primary particle diameter in the range of 5 to 100 nm with N-acylated lysine or methyl hydrogen polysiloxane. The present invention relates to a cosmetic characterized in that by blending high quality powder, skin troubles such as spots are less noticeable and a uniform finish is obtained.

[0002]

2. Description of the Related Art Coating of powder with N-acylated lysine is disclosed in JP-A-61-7207 and JP-A-61-1.
No. 0503, JP-A-61-69709 and JP-A-5-186706. Coating a powder with a large amount of methyl hydrogen polysiloxane is known in Japanese Patent Application Laid-Open No. 5-221828.

However, the conventional surface treatment aims at modifying the surface of the powder, and has not been studied for the purpose of fixing the child particles to the base particles as in the present invention. For this reason, no study has been conducted on the effect of making the skin trouble optically noticeable as in the present invention.

[0004]

That is, the present invention provides:
An object of the present invention is to blend a modified powder in which child particles are fixed to mother particles into a cosmetic so that skin problems such as spots are less noticeable optically.

[0005]

Means for Solving the Problems To achieve the above object, the present inventors have conducted intensive studies and found that a mixture of plate-like barium sulfate and iron-containing fine particle titanium oxide having an average primary particle diameter in the range of 5 to 100 nm was obtained. By incorporating a modified powder obtained by performing a surface treatment with N-acylated lysine or methylhydrogenpolysiloxane, it is possible to make skin troubles such as spots less noticeable and obtain a uniform finish. The inventors have found that a unique cosmetic can be obtained, and have completed the present invention.

[0006]

Embodiments of the present invention will be described below in detail.

The plate-like barium sulfate used in the present invention corresponds to barium sulfate having a plate-like or scaly shape and an average particle diameter in the major axis direction of, for example, 1 to 30 μm. Although an effect similar to the present invention can be obtained by using an extender other than barium sulfate such as mica, there is a feature that the optical characteristics of the present invention can be obtained most effectively when barium sulfate is used.

The iron-containing fine particle titanium oxide used in the present invention has an average primary particle size of 5 to 100 nm. If the average primary particle size is less than 5 nm, there is a problem that the catalytic activity is too strong, and if it exceeds 100 nm, there is a problem that the iron-containing fine particle titanium oxide cannot be immobilized on the barium sulfate plate. As the shape of iron-containing fine particle titanium oxide,
Examples include a spherical shape, a rod shape, a spindle shape, an irregular shape, and a plate shape, but are not particularly limited. Examples of the method for adding iron to the fine particle titanium oxide include, for example, a method of coating the surface of titanium oxide with an iron-containing compound such as iron oxide, iron hydroxide, or an organic iron complex, and heating or baking in some cases. Examples include a method of simultaneously introducing an iron-containing compound when producing titanium, and a method of doping titanium oxide with iron using an apparatus such as ion sputtering. The introduction ratio of iron to titanium is preferably in the range of 0.001 to 10 mol of iron with respect to 100 mol of titanium. The color of the iron-containing fine particle titanium oxide generally includes yellow, red, and black. Of these, yellow is preferable because of its excellent effect of making skin troubles such as yellow spots less noticeable.

The mixing ratio of the plate-like barium sulfate and the iron-containing fine particle titanium oxide is 99.
It is preferably in the range of 9: 0.1 to 65:35.
When the mixing ratio of the iron-containing fine particle titanium oxide is within this range, the optical effect is excellent, and the coloring characteristic of the iron-containing fine particle titanium oxide does not become too strong.

The N-acylated lysine used in the present invention has at least one aliphatic acyl group having 8 to 22 carbon atoms in the molecule. Examples thereof include N-lauroyl lysine and N-myristyl lysine. , N-palmitoyl lysine,
N-stearyl lysine, N-behenyl lysine, N-caprylysine and the like can be mentioned. Among them, N-
Lauroyl lysine is particularly preferred.

As a surface treatment method using N-acylated lysine, for example, an alkaline solution of N-acylated lysine is prepared, and the solution is slowly dropped into an acidic aqueous powder slurry with stirring. A method in which an alkaline solution of acylated lysine is charged into a powder slurry, and then an acidic substance is slowly added dropwise with stirring. In addition, as a mixing method of the plate-like barium sulfate and the iron-containing fine particle titanium oxide, for example, even in the case of a dry method, using a mixer such as a Henschel mixer or an atomizer, a pulverizer,
In a wet method, stirring may be performed in a solution.

The coating ratio of N-acylated lysine to the mixture of plate-like barium sulfate and iron-containing fine particle titanium oxide used in the present invention is 99: 1 to 1: 1 by weight of the mixture and N-acylated lysine. It is preferably in the range of 50:50. When it is within this range, the immobilization of the iron-containing fine particle titanium oxide becomes sufficient, and the single crystal of N-acylated lysine grows too much, the amount of oil absorption increases, and problems such as heavy feeling do not occur. .

The methyl hydrogen polysiloxane used in the present invention is preferably a linear or cyclic compound having a degree of polymerization in the range of 3 to 1,000, and more preferably in the range of 10 to 60. More preferred.
Although a dimethylsiloxane skeleton may be introduced in addition to methylhydrogensiloxane, the ratio of the number of dimethylsiloxanes to the total number of silicon is preferably less than 70% because reactivity during heating is deteriorated. .

In the treatment using the methylhydrogenpolysiloxane of the present invention, a heat treatment is required. The conditions of the heat treatment include, for example,
00 hours.

In the present invention, the mixing ratio of methyl hydrogen polysiloxane to the plate-like barium sulfate and the iron-containing fine particle titanium oxide mixture is 9 by weight.
It is in the range of 5: 5 to 30:70. If the ratio of methylhydrogenpolysiloxane is less than 5, the powders are individually surface-treated and there is a problem that immobilization is insufficient, and if it exceeds 70, the absolute amount of the powder is insufficient. There is a problem that the optical effect becomes insufficient.

As a method of treating the above mixture with methyl hydrogen polysiloxane, for example, the mixture is mixed with methyl hydrogen polysiloxane in a dry manner,
Examples of the method include a method of performing a heat treatment, a method of mixing the two using a solvent, and then distilling off the solvent and further performing a heat treatment.

In the modified powder of the present invention, if the child particles are substantially fixed on the surface of the base particles by the above method,
Oils and powders conventionally used in cosmetics may be present on the powder surface at the same time. When the iron-containing fine particle titanium oxide, which is a child particle, is substantially fixed, the color developing properties become more uniform, and the characteristic of reducing the frictional feeling peculiar to the fine particle powder is maintained.

The weight ratio of the modified powder in the cosmetic of the present invention is 0.1 to 99%. In the present invention, the modified powder obtained by fixing the iron-containing fine particle titanium oxide on the substantially plate-like barium sulfate surface is, for example, the number of the iron-containing fine particle titanium oxide when observed by a scanning electron microscope. Refers to a modified powder such that 70% or more of the powder is found on plate-like barium sulfate.

In the cosmetic of the present invention, in addition to the above powder,
Oils, powders (pigments, pigments, resins), fluorine compounds, resins, surfactants, adhesives, preservatives, fragrances, and UV absorbers (including organic and inorganic types) that are commonly used in cosmetics.
-A or B), and components such as a humectant, a physiologically active ingredient, a salt, a solvent, an antioxidant, a chelating agent, a neutralizing agent, and a pH adjuster can be simultaneously added. it can.

The powder used in the present invention includes, for example, Red No. 104, Red No. 201, Yellow No. 4, Blue No. 1, Black No. 4
No. 01, etc., yellow No. 4 Al lake, yellow No. 203 B
Lake pigments such as a lake, polymers such as nylon powder, silk powder, urethane powder, Teflon powder, silicone powder, cellulose powder, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, carbon black, ultramarine blue, navy blue White pigments such as zinc oxide, titanium oxide, and cerium oxide; extender pigments such as talc, mica, sericite, and kaolin; pearl pigments such as mica titanium; barium sulfate, calcium carbonate, magnesium carbonate, and aluminum silicate. Metal salts such as magnesium silicate,
Inorganic powders such as silica and alumina, particulate titanium oxide, particulate zinc oxide, particulate iron oxide, alumina-treated particulate titanium oxide, silica-treated particulate titanium oxide, bentonite,
And smectite. There is no particular limitation on the shape of these powders.

Examples of oils include higher alcohols such as cetyl alcohol, isostearyl alcohol, lauryl alcohol, hexadecyl alcohol, octyl dodecanol, fatty acids such as isostearic acid, undecylenic acid and oleic acid, glycerin, sorbitol, ethylene Glycol, propylene glycol, polyhydric alcohols such as polyethylene glycol, myristyl myristate, hexyl laurate, decyl oleate, isopropyl myristate, hexyldecyl dimethyloctanoate, glyceryl monostearate, diethyl phthalate,
Esters such as ethylene glycol monostearate and octyl oxystearate, hydrocarbons such as liquid paraffin, petrolatum, squalane, waxes such as lanolin, reduced lanolin, carnauba wax, mink oil, cocoa butter, coconut oil, palm kernel oil And oils such as camellia oil, sesame oil, castor oil, olive oil and the like, and ethylene / α-olefin / co-oligomer.

Examples of other types of oils include dimethylpolysiloxane, methylhydrogenpolysiloxane, methylphenylpolysiloxane, polyether-modified organopolysiloxane, and fluoroalkyl.
Polyoxyalkylene co-modified organopolysiloxane,
Alkyl-modified organopolysiloxane, terminal-modified organopolysiloxane, fluorine-modified organopolysiloxane, amodimethicone, amino-modified organopolysiloxane, silicone gel, acrylic silicone, trimethylsiloxysilicic acid, silicone compounds such as silicone RTV rubber, perfluoropolyether, Pitch fluoride,
Fluorine compounds such as fluorocarbon and fluoroalcohol are exemplified.

As the surfactant, for example, an anionic surfactant, a cationic surfactant, a nonionic surfactant, and an amphoteric surfactant can be used.

Examples of the organic ultraviolet absorbent include 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl paradimethylaminobenzoate, and 2-hydroxy-4.
-Methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfuric acid, 2,2'-dihydroxy-4-methoxybenzophenone, p-methoxyhydrocinnamic acid-diethanolamine salt, p-aminobenzoic acid (hereinafter abbreviated as PABA) , Ethyl hydroxypropyl PABA, glyceryl PABA, homomenthyl salicylate, methyl-O-aminobenzoate, 2-ethylhexyl-2-cyano-3,3-diphenyl acrylate, octyl dimethyl PABA, octyl methoxycinnamate, octyl salicylate, 2-phenyl -Benzimidazole-5-sulfate, triethanolamine salicylate, 3- (4-methylbenzylidene) camphor, 2,4
-Dihydroxybenzophenine, 2,2 ', 4,4'-
Tetrahydroxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2-hydroxy-4-N-octoxybenzophenone, 4-isopropyl-dibenzoylmethane, butylmethoxydibenzoylmethane, 4- (3 4-dimethoxyphenylmethylene) -2,5-dioxo-1-imidazolidine-2-ethylhexyl propionate.

The solvent used in the present invention includes cyclic silicone, ethanol, light liquid isoparaffin, lower alcohol, ethers, LPG, fluorocarbon, N-
Examples include methylpyrrolidone, fluoroalcohol, volatile linear silicone, and the like.

Examples of the cosmetics of the present invention include makeup cosmetics such as foundation, white powder, eyeshadow, teak and lipstick, and basic cosmetics such as emulsions, creams and sunscreens.

[0027]

The present invention will be described in detail below with reference to examples and comparative examples.

Sensory Characteristic Test A sensory characteristic test was carried out by 20 women on the uniformity of the finish of the test product, the difficulty of seeing skin troubles, and the smoothness of the touch. The evaluation was performed according to a five-point method. The higher the score, the higher the evaluation, and the lower the score, the worse the evaluation. The scores of the 20 persons were summed to obtain an average score, and the test pieces were evaluated based on the average score.

Production Example 1 20 parts by weight of iron-doped fine particle titanium oxide (average particle diameter 35 nm, yellow) and 75 parts by weight of plate-like barium sulfate were mixed using a mixer. To this, 250 parts by weight of purified water was added and stirred to obtain a slurry A. Next, 5 parts by weight of N-lauroyl-L-lysine (manufactured by Ajinomoto, Amihope LL), which is a kind of N-acylated lysine, was dissolved in a mixed solution of 13 parts by weight of 5N sodium hydroxide and 80 parts by weight of purified water. Dissolution B was prepared. While vigorously stirring slurry A,
The solution B was slowly dropped (dropping time 30 minutes). After completion of the dropwise addition, the pH was adjusted to 7.0 using 6N hydrochloric acid, and the mixture was further stirred for 30 minutes. Next, after filtering the obtained slurry, purified water was added, desalting was repeated, and the concentration of sodium chloride was adjusted to 0.01% or less using a salt meter. The obtained powder, using a blown air dryer,
After drying at 85 ° C. for 12 hours, the mixture was heated at 125 ° C. for 5 hours and sterilized. Then, the mixture was pulverized using a mixer to obtain a desired modified powder (processing concentration: 5%).

Production Example 2 20 parts by weight of iron-doped fine particle titanium oxide (average particle diameter 35 nm, yellow) and 70 parts by weight of plate-like barium sulfate were mixed using a mixer. To this, 10 parts by weight of methyl hydrogen polysiloxane was added and mixed more slowly. The obtained powder was heated at 190 ° C. for 25 hours to obtain a desired modified powder (treatment concentration: 10%).

Example 1 (Foundation) A foundation was prepared according to the formulation shown in Table 1.
The modified powder used in Production Example 1 was used. Further, the compounding amount is% by weight.

[0032]

[Table 1]

Component A was mixed using a mixer. The component B was uniformly dissolved, added to the mixed component A, further mixed, pulverized using a mixer, and pressed into a metal plate using a mold to obtain a product.

Example 2 (Foundation) In the same manner as in Example 1 except that the modified powder of Production Example 2 was used instead of the modified powder of Production Example 1 used in Example 1, Got the product.

Comparative Example 1 (Foundation) A product was produced in the same manner as in Example 1 except that fine particle titanium oxide (average particle diameter: 35 nm) was used instead of the modified powder of Production Example 1 used in Example 1. I got

Comparative Example 2 (Foundation) Instead of the modified powder of Production Example 1 used in Example 1, the same iron-containing fine particle titanium oxide (average particle diameter 35 nm) as used in Production Example 1 was used. In all other respects, a product was obtained in the same manner as in Example 1.

Comparative Example 3 (Foundation) In place of the modified powder of Production Example 1 used in Example 1, the same plate-like barium sulfate used in Production Example 1 was used, except that the same powder was used. A product was obtained in the same manner as described above.

Comparative Example 4 (Foundation) Instead of the modified powder of Production Example 1 used in Example 1, iron-doped fine particle titanium oxide (average particle diameter 35 nm, yellow)
A product was obtained in the same manner as in Example 1 except that a mixed powder obtained by mixing 20 parts by weight, 75 parts by weight of plate-like barium sulfate, and 5 parts by weight of N-lauroyl-L-lysine with a mixer was used.

Table 2 shows the evaluation results of the examples and comparative examples.

[0040]

[Table 2]

From the results shown in Table 2, it can be seen that the examples have excellent performance in all of the items as compared with the comparative examples. On the other hand, in the comparative examples, there were some test items with good results, but bad examples were found in any of the items.

[0042]

As described above, the present invention relates to a method of preparing a mixture of plate-like barium sulfate and iron-containing fine particle titanium oxide having an average primary particle diameter in the range of 5 to 100 nm by using N-acylated lysine or methyl hydrogen polystyrene. By blending the modified powder obtained by surface treatment with siloxane, it is clear that skin problems such as spots are less noticeable and a uniform finish can be obtained. It is.

Claims (2)

[Claims] 1. A plate-like barium sulfate having an average primary particle diameter of 5
A mixture of iron-containing fine particle titanium oxide in the range of about 100 nm to about 100 nm, which is surface-treated with N-acylated lysine, wherein the iron-containing fine particle titanium oxide is substantially fixed on the plate-like barium sulfate surface. Cosmetics containing high quality powder. 2. A plate-like barium sulfate having an average primary particle diameter of 5
A mixture of iron-containing fine particles of titanium oxide in the range of １００100 nm was treated with methylhydrogenpolysiloxane at a weight ratio of 95: 5 to 30:70, and the surface of substantially barium sulfate was substantially treated. A cosmetic comprising a modified powder, wherein iron-containing fine particle titanium oxide is fixed to the composition.