JPH0458443B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a novel surface-treated pigment for make-up cosmetics, and more specifically, it relates to a surface-treated pigment that is smooth,
To provide a water-repellent treated pigment that spreads well, has a moisturizing effect, and does not irritate the skin. Conventional make-up cosmetics represented by powder foundation, rouge, and eye shadow,
In order to prevent makeup from fading due to sweating on the skin, or to make makeup last longer, metal soap is added to the pigment, or the surface of the pigment is coated with silicone or metal soap to make it water repellent. It's here. However, when metal soap is added to the pulp, not only is it not possible to obtain sufficient water repellency, but the metal soap itself may cause problems due to skin irritation, and the color may become dull, which is not preferable. When the surface of the pigment is treated with metal soap, these problems are slightly improved, but it is not perfect.
I am also dissatisfied with the stretch and feel. On the other hand, pigments surface-treated with silicone are also widely used. Although silicone-treated pigments have excellent water repellency and spreadability, they have drawbacks such as poor adhesion and the lack of a wet feel from the powder itself, which makes the skin dry and rough. The present inventors have conducted intensive research to solve the problems encountered so far and to develop a pigment ideal as a pigment for make-up cosmetics, and as a result, they have arrived at the present invention. That is, by uniformly coating the surfaces of pigments and extender pigments with hydrogenated lecithin, it was possible to obtain water-repellent treated pigments that were smooth, spreadable, had a moisturizing effect, and did not irritate the skin. The present invention will be described in detail below. The hydrogenated lecithin used in the present invention is obtained by hydrogenating natural lecithin or synthetic lecithin extracted from egg yolk, soybean, corn, rapeseed, etc., and has an iodine value of 30 or less. Moreover, it is necessary to select high-quality lecithin that is not oxidized or discolored before hydrogenation. In the present invention, lecithin refers not only to phosphatidylcholine, but also to phospholipids such as phosphatidylethanolamine, phosphatidylserine, and phosphatidylinositol, which are found in egg yolks, soybeans, corn, rapeseed, etc. and neutral fat. Since most of these phospholipids are unsaturated fatty acid esters, they are easily oxidized, causing problems such as discoloration and generation of off-flavors. For this reason, it is necessary to use lecithin that has been stabilized by hydrogenation. In particular, when egg yolk lecithin is hydrogenated and the pigment surface is treated with an iodine value of 30 or less,
Thereafter, there were no problems such as discoloration or generation of off-odor, and an extremely excellent treated pigment was obtained. To give an example of a method for surface treating pigments and extender pigments using hydrogenated lecithin, first, the pigment to be surface treated (for example, titanium oxide, zinc oxide, zirconium oxide, Bengara, yellow iron oxide, black iron oxide,
Inorganic pigments such as ultramarine blue, chromium oxide, chromium hydroxide,
Talc, kaolin, muscovite, sericite, other micas, magnesium carbonate, calcium carbonate, aluminum silicate, magnesium silicate, calcium silicate, clays, other extender pigments, titanium mica, bismuth oxychloride, silica beads, plastic beads such as nylon and acrylic, tar pigments, natural pigments, etc.) are decomposed in water. Next, hydrogenated lecithin in an amount equivalent to 0.3 to 10% by weight based on the pigment is added and heated while stirring vigorously to completely dissolve or emulsify the hydrogenated lecithin. At this point, a portion of the hydrogenated lecithin is oriented and adsorbed onto the surface of the pigment. For more complete adsorption, Al, Mg,
Soluble salts such as Ca, Zn, Zr, Ti (e.g. aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum potassium sulfate, magnesium chloride, magnesium sulfate, magnesium nitrate, magnesium sulfate, magnesium nitrate, magnesium sulfate, calcium chloride, calcium nitrate, Add a 1 to 30% aqueous solution of calcium acetate, zinc chloride, zinc nitrate, zinc sulfate, zinc acetate, zirconium sulfate, zirconium chloride, titanium oxysulfate, titanium tetrachloride, etc.) in an amount of 0.1 to 2 equivalents to hydrogenated lecithin. Drip. As a result, the hydrogenated lecithin becomes a water-insoluble metal salt and is completely oriented and adsorbed onto the pigment surface. It is also possible to simultaneously incorporate and adsorb neutral fat oil such as egg yolk oil together with the phospholipid. This is dehydrated using a centrifugal dehydrator and dried at 80 to 120°C to obtain the desired treated pigment. The treated pigment thus obtained is smooth and
It spreads well, has a moisturizing effect, does not irritate the skin, and has strong water repellency, making it an excellent pigment for make-up cosmetics. Furthermore, the treated pigment of the present invention can exhibit more useful characteristics by sterilizing it by heating or the like without drying the treated pigment after reaction. Specifically, hydrogenated lecithin is oriented and adsorbed onto the surface of various pigments in water, and then centrifugally dehydrated.
Wrap it in plastic film and heat sterilize it in boiling water. This product is mixed and used in the base of aqueous or kneaded make-up cosmetics, such as water white powder, kneaded white powder, foundation, etc., without drying. This treated pigment has hydrogenated lecithin oriented and adsorbed, and at the same time contains a large amount of water. Therefore, the dehydrated cake after the reaction can be easily dispersed in other water systems and emulsion systems without applying special force or adding large amounts of surfactants that can cause skin damage, and it does not settle. However, it can be easily redispersed. When the water-dispersed makeup cosmetic or emulsion makeup cosmetic thus obtained is applied to the skin, it adheres very uniformly and strongly. The treated pigment on the skin loses moisture through natural drying and remains as highly water-repellent particles that cannot be wetted by water again. Therefore, the makeup does not easily come off, the makeup effect can be maintained for a long time, and it is moisturizing and does not irritate the skin, making it an extremely excellent makeup cosmetic. This will be explained in more detail with reference to Examples below. Example 1 1 kg of sericite was added to the water in step 5 under vigorous stirring and uniformly dispersed. To this was added 10 g of hydrogenated egg yolk lecithin (60% phospholipid, iodine value 28) and heated to 70°C to completely suspend. Next, 80 ml of a 20% aluminum sulfate aqueous solution was added dropwise over 10 minutes, and stirring was continued for an additional 10 minutes. This is dehydrated using a centrifugal dehydrator, crushed and heated to 105°C.
A treated pigment was obtained by drying with hot air for 16 hours. The resulting treated sericite has strong water repellency, is extremely smooth and moist, and does not feel rough when applied to the skin, giving it an excellent feel.
It was ideal as a pigment for make-up cosmetics. Comparative Example 1 100 g of sericite was added to 0.5 g of vigorously stirred water and uniformly dispersed. 1 g of potassium myristate was added to this and completely dissolved. Next, 10ml of 20% zinc sulfate aqueous solution was added dropwise over 10 minutes, and then
Stirring was continued for 10 minutes. After the reaction was completed, the mixture was pulverized using suction filter using a Nutsuchie and dried with hot air at 105°C for 10 hours. Although the obtained metal soap-treated sericite had good adhesion, it was a little squeaky and had poor spreadability. Moreover, the water repellency was also slightly inferior. Comparative example 2 1.5 g of dimethylhydrodiene polysiloxane
Completely dissolve in 15g of benzene and add 50g of sericite.
and then mixed for 5 minutes with a household mixer. This was air-dried at room temperature to completely remove benzene, and then heated to 120°C.
Baking treatment was carried out for 3 hours. The obtained silicon-treated sericite had a slightly peculiar odor and had excellent water repellency and fluidity, but the powder had a very dry feel and poor adhesion, making it dry when applied to the skin. Example 2 1 kg of talc was added to the water in step 4 under vigorous stirring and uniformly dispersed. Next, 20 g of hydrogenated soybean lecithin (30% phospholipid, iodine value 5) was dissolved in 1 part of hot water and added to the pigment dispersion. 100 ml of a 20% aqueous aluminum nitrate solution was added dropwise over 10 minutes, and stirring was continued for an additional 10 minutes. This was dehydrated using a centrifugal dehydrator and dried with hot air at 105°C for 16 hours. The resulting treated talc had a slight yellow color, but had strong water repellency, was very smooth, moist, and had an excellent feel. Example 3 1 kg each of mica, mica titanium, titanium oxide, yellow iron oxide, Bengara, and black iron oxide were treated by the following method. First, 1 kg of the pigment was added to the water in step 4 that was being vigorously stirred and uniformly dispersed. Next, add 30g of hydrogenated egg yolk lecithin (phospholipid 30%, iodine value 5) to 1
was dissolved in hot water and added to the pigment dispersion. 100 ml of a 20% aqueous aluminum nitrate solution was added dropwise over 10 minutes, and stirring was continued for an additional 10 minutes. This was dehydrated using a centrifugal dehydrator and dried with hot air at 105° C. for 16 hours to obtain treated mica, treated mica titanium, treated titanium oxide, treated yellow iron oxide, treated bengar, and treated black iron oxide. All of the obtained treated pigments had strong water repellency, were smooth, moisturized, and had an excellent feel, making them ideal as pigments for make-up cosmetics. Example 4, Comparative Example 3 A powder foundation with the following formulation was made. Powder foundation component 1 Treated sericite of Example 1 50.0 (parts by weight) Treated talc of Example 2 8.1 Treated mica powder of Example 3 3.0 Treated mica titanium 3.0 Treated titanium oxide 19.0 Treated yellow iron oxide 3.0 Treated Bengara 1.0 〃 Treated black iron oxide 0.2 Ingredient 2 Squalane 5.0 (parts by weight) Methylpolysiloxane 3.0 Isopropyl myristate 2.0 Paraffin 1.0 Surfactant 1.0 Preservative 0.2 Fragrance 0.5 Mix ingredient 1 with a Henshil mixer and use an atomizer Smash. The heated mixture of component 2 is put into this, mixed with a Henshil mixer, and then pulverized with an atomizer again. This was filled into a medium plate and molded to produce a product. The powder foundation obtained in the above example was a two-way type powder foundation with strong water repellency that could be applied with a sponge or with a sponge containing water. As a result of a comparison using a powder foundation made using the same raw materials, pigments and extender pigments that were previously treated with methylhydrodiene polysiloxane, and the same method with the same ingredient 2 added,
The powder foundation using the pigment of the present invention was excellent in terms of adhesion to a sponge, adhesion to the skin, spreadability, smoothness after makeup application, and makeup durability. Although egg yolk lecithin and soybean lecithin are referred to in the examples, the phospholipids contained in each of them had the following compositions.

[Table]

[Table] As is clear from the above description, the pigment or extender pigment coated with the hydrogenated lecithin of the present invention is very close to the skin tissue, so it provides superior protection to the skin compared to conventional pigments. has an effect,
Moreover, it has excellent feel and water repellency, making it ideal as a pigment for make-up cosmetics such as powder foundations, rouges, and eye shadows.

Claims (1)

[Scope of Claims] 1. A pigment or extender pigment for cosmetics, characterized in that it has been surface-treated with hydrogenated lecithin. 2. A cosmetic pigment or extender pigment, characterized in that a water-insoluble hydrogenated lecithin metal salt selected from Al, Mg, Ca, Zn, Zr, and Ti is oriented and adsorbed on the surface.