JPS60226805A - Cosmetic - Google Patents

Abstract

PURPOSE:A cosmetic that contains pigments coated with fine amorphous silica films on the particles of the pigments, thus showing high stability to chemical agents, safety to skins and giving refreshing and milk fellings. CONSTITUTION:An inorganic pigment selected from iron oxides, cobalt, manganese, chromium oxide pigments and ultramarine is used as a core and coated with fine amorphous silica deposited and, when necessary, subjected to hydrophobic treatment with an organosilica to improve its dispersibility, and stability. The resultant pigments are added to cosmetics. The amount of the silica coating films is 1-30wt%, preferably 2-20wt%, calculated as SiO2. EFFECT:There is no anxiety of color changes in cosmetics to enable the cosmetic to be used with ease. The rolling effect is developed to improve the dispersibility of the pigment and the quality of the cosmetic.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cosmetic containing a silica-coated color pigment in which a fine, amorphous silica film is formed on the surface of the color pigment particles.

Coloring pigments are generally indispensable in cosmetics, and it is well known that they are used as a variety of organic or inorganic coloring agents depending on the purpose of use.

However, although pigments are normally insoluble in water or organic solvents, when evaluated microscopically, they can be significantly altered or soluble by heat, light, or chemical agents (acid or alkali effects) during use. There are many cases.

Since cosmetics are used for the skin, coloring pigments in particular are required to have stricter safety than those used for other purposes, and are desired to be as resistant to external stimuli as possible. Furthermore, depending on how the coloring pigment is mixed with other materials, the fragrance may be decomposed within the catalyst or the shelf life may be impaired.

For example, ultramarine is often used in eye shadow cosmetics, but since it is a type of sulfide, it can cause hair loss if misused, or it can decompose with a hydrogen sulfide odor at the pH level of sweat. It is also unfavorable for the skin and human physiology. On the other hand, in cosmetics, it goes without saying that weakly acidic and mild materials are preferable, and materials that have a rolling effect and give the cosmetics a smooth feel or even a nine-tone feel are preferred, but colored pigments There are few that can completely meet such demands.

The inventors of the present invention conducted extensive research in view of the above facts, and found that
The present invention was completed based on the discovery that colored pigments with a silica film are not only safe for use in cosmetics, but also solve the problem of sagging all at once.

That is, the present invention relates to a cosmetic composition containing a silica-coated colored pigment in which a fine amorphous silica film is formed on the colored pigment.

The coloring pigments to which the present invention is applied include all coloring pigments conventionally used as cosmetic colorants.

Examples of inorganic pigments include ultramarine blue, yellow iron oxide, red iron oxide, iron black (black iron oxide), chromium oxide, chromium hydroxide,
Calamine, cobalt violet, mankan violet), cloud i titanium, carbon black, metal pigments, etc.

The feature of the present invention is that it is a silica-coated colored pigment which uses a colored pigment as a core material and is coated with a silica film formed by depositing fine amorphous silica on the particle surface.

This silica film is continuous and can be said to encapsulate the core colored pigment particles.

Depending on the relationship between the film thickness and the core material, such a silica film can generally be observed directly using an electron microscope, but in the case of a core material whose constituent elements are similar to silica, the film and It may be difficult to distinguish the core materials from the above observations.

However, even in this case, if it is confirmed through the above observation that there are no gel-like silica that is clearly considered to be porous or a large number of aggregates of free silica fine particles that do not contribute to the film, then silica can be considered as the core pigment. It can be understood as being integrated to form a film.

Such a silica film has extremely strong resistance to external stimulation of the core material, is stable against acids and alkalis as well as other chemical substances, and is also stable against light and heat.

Therefore, when the pigment according to the present invention is used as a cosmetic product, it goes without saying that the pigment has no direct effect on the skin.
When preparing cosmetics, there is no reaction with water or oil components, so materials can be selected freely and there is no need to worry about discoloration of the cosmetics.

In particular, ultramarine blue is essential for eye shadows due to its vivid ultramarine blue color, but the high isoelectric point of these particles causes problems such as damaging the skin and producing a hydrogen sulfide odor due to the slightly acidic nature of sweat. Or, these are solved all at once with surprising #1.

In this way, the particle surface of the silica-coated color pigment changes to be slightly acidic, and the isoelectric point of the silica-coated color pigment is always modified to be in a state that is very favorable to the skin, compared to that of the core material. ing.

On the other hand, the formation of this silica film produces a rolling effect and improves the dispersibility of colored pigments, which also improves the properties of cosmetics.

It can be obtained by adding or generating a silica sol.

For example, in a colored pigment slurry heated to 700 or higher,
Add an alkali silicate aqueous solution and an acid simultaneously to adjust the pH to 8 to 1.
A silica film is formed by a method of carrying out a silica deposition treatment in the above pH range, or by a method of adding an alkaline silicate aqueous solution to the slurry in advance and then gradually adding an acid to deposit silica in the above pH range. I can do it. Alternatively, an active silica sol may be prepared separately and added to the pigment slurry.

In addition, when performing the silica coating treatment, if necessary, a colored pigment slurry may be added in advance to aluminum, zirconium,
Metal hydroxides such as magnesium and titanium can be precipitated.

The amount of silica film is 1 to 1 depending on the type of color pigment and manufacturing process.
50 parts by weight, preferably in the range of 2 to 20 parts by weight. The reason for this is that if H81Oz is less than 1 weight, it will be insufficient to form a silica film and no drifting effect will be obtained; on the other hand, if it is less than 1 weight,
Although there is no particular problem when only the particle characteristics are utilized, the pigment concentration decreases and the coloring power becomes weak, and a range of 2 to 20% by weight is generally suitable. Note that for manufacturing reasons, it is permitted to contain approximately 2 weights of alumina as the silica film FiAltos.

The silica-covered A-layer color pigment of the present invention is made hydrophobic with the particle surface using an organic silicate compound, a higher fatty acid or a metal salt thereof, or other hydrocarbons such as tertiary alcohol, oil, fat, wax, wax, etc., as necessary. By pre-treatment, -no-dispersion property and stability can be improved.

Examples of organic silicate compounds include vinyl/l/
) IJ(β-methoxyethoxy)silane, vinyltrimethoxysilane, vinyl) IJethoxysilane, α
- methacryloxyglobil methoxy 7rane, β-(3,
4epoxy7cyclohexyl)ethyltrimethoxysilane, λ-crisitoxypropyltrimethoxysilane, N-
Silane coupling agents such as β (aminoethyl) r-aminopropyltrimethoxysilane, N-β (aminoethyl) r-aminopropylmethyldimethoxysilane, T-aminopropyltriethoxysilane, tetramethylsilane, dimethylethylsilane, Trimethylbutylsilane, trimethylphenylsilane, triethylpropylsilane,
Silane compounds such as tetraethylsilane and tetrabutylsilane, polydimethylsiloxane, methylhydrodiene polysiloxane, methylphenylsiloxane, ether-modified polysiloxane, olefin-modified polysiloxane,
Silicone oils such as fluorine-modified polysiloxane, alcohol-modified polysiloxane, higher fatty acid-modified polysiloxane, and amino-modified polysiloxane are irritating.

Examples of higher fatty acids include caproic acid, capric acid,
Lauric acid, myristic acid, palmitic acid, stearic acid, heenic acid, oleic acid, linoleic acid, liluic acid, lignoceric acid, cerotic acid, etc., and their metal salts include salts of calcium, magnesium, aluminum or zinc. Examples of oils and fats include olive oil, almond oil, peanut oil, castor oil, coconut oil, cottonseed oil, palm oil, sesame oil, etc. Examples of waxes include beeswax, carnauba wax, silicone wax, etc., and higher alcohols include Examples of hydrocarbons include cetanol, stearyl alcohol, lanolin alcohol, methyl alcohol, and hexadecyl alcohol; examples of hydrocarbons include squalane, squalene, liquid halafine, petrolatum, solid paraffin, osikerite, and microcrystalline wax; examples of esters include Examples include isopropyl myristate, isopropyl palmistate, myristyl acetylate, common fatty acid ester, myristyl palmitate, ethyl stearate, and ethylene glycol distearate.

The silica-adhered colored pigment according to the present invention is surprisingly stable against chemical agents, ensuring complete safety for the skin. On the other hand, in recent years, there has been a tendency for cosmetics to have a smooth and mild feel on the skin, and the coloring pigment of the present invention meets these needs.
It is completely the same as the conventional method and can be used with peace of mind.

[Preparation of silica-coated colored pigment]

Preparation Example 1 After heating a 100 f/l pigment aqueous slurry for 90 UK, a small amount of sodium silicate aqueous solution is added and dispersed sufficiently uniformly. Next, as 810z, 5 parts by weight of a sodium silicate aqueous solution and 4 parts by weight of a sulfuric acid solution are gradually added in predetermined amounts at the same time while the pH of the slurry system is always maintained in the range of 95 to 10. After addition,
After this state is maintained for a while, the dilute sulfuric acid is added to neutralize to pH 6.5, and a flocculant is added to perform solid-liquid separation.

Next, the mixture is washed with water, dried and ground in a conventional manner to obtain a colored pigment powder coated with amorphous silica.

Preparation Example 2 A predetermined amount of the same sodium silicate aqueous solution as above was added to a 100 f/l colored pigment aqueous slurry, maintained at 90 C, and sufficiently mixed and dispersed. Next, 4 parts by weight of acetic acid aqueous solution is gradually added to this slurry while stirring, and the dropwise addition is stopped when the pH reaches 9 to 95. Hold it for a while, then press P.
After reducing H to 6.5 to ZO, inclined water washing, filtration and water washing,
Drying and grinding yield a colored pigment powder coated with amorphous silica.

Preparation Example 3 A solution prepared by dissolving 3 parts by weight of methylhydrodiene polysiloxane in 18 parts by weight of benzene is added to 100 parts by weight of the silica-coated colored pigment obtained in Preparation Example 1 or 2, and the mixture is sufficiently mixed to make the mixture uniform. This is air-dried at room temperature for 24 hours to remove benzene, and then baked at 130C for 3 hours to obtain a silica-coated colored pigment surface-treated with organosilicon.

Example 1 Creamy Foundation C Fragrance, Preservative After mixing additive A uniformly in a blender, B is added thereto and mixed evenly. C is then added to the mixture and mixed, and then C is added to obtain a cosmetic product as a homogeneous mixture. This cosmetic product had an extremely long-lasting fragrance compared to a comparison product prepared by blending an iron oxide pigment that was not coated with silica.

Example 2 Eyeshadow C fragrance, preservative After mixing additive A with a Henshil mixer, B was heated and homogenized and added to the mixture of A, and then C was added and mixed thoroughly to form eye shadow. get cosmetics for use. This eye shadow spread well and had a good feeling on use.

For comparison, when a cosmetic prepared using a similar blend of iron oxide and ultramarine without silica coating was immersed in a liquid with a pH level of 4, which is similar to that of lacrimal glands, a hydrogen sulfide odor was felt after a while. However, the product of the present invention had no depth at all.

Example 3 (Eyeshadow) In Example 2, chromium green (SiO
An eye shadow was obtained by blending and preparing in the same manner except that z: 12.64) was used.

Example 4 Powder Foundation C Fragrance, Preservative Preparation Preparation procedures were carried out in the same manner as in Example 2 to obtain a powder foundation.

This powder was kept at room temperature in the dark for 6 months, but there was no cake cracking or change in coloring properties, and it was stable in non-electrostatic conditions.

Example 5: Ohoku C fragrance, preservative After mixing additive A with a Henshil mixer, B was heated and homogenized and added to the homogeneous mixture of A, then C was added, and the mixture was thoroughly mixed. Get blusher cosmetics.

Claims (1)

[Scope of Claims] (1) A cosmetic containing a silica-coated color pigment in which a fine, amorphous silica film is formed on the surface of the color pigment particles. (2) The cosmetic according to claim 1, wherein the colored pigment is an inorganic colored pigment. (3) The inorganic coloring pigment is an iron oxide pigment, a cobalt pigment,
30. The cosmetic according to claim 1, which is selected from manganese pigments, chromium oxide pigments, and ultramarine blue. (5) The cosmetic according to claim 1, wherein the silica-covered colored pigment is surface-treated to make it hydrophobic with an organonlica compound.