JPH0242387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel barium sulfate coated flake pigment and a method for producing the same. More specifically, the present invention provides a novel flaky pigment coated with barium sulfate that has good adhesion to the skin, spreadability, and transparency, and a method for producing the same.

Conventionally, flaky fine powders such as talc made of micas such as muscovite and sericite, clays such as kaolinite, and hydrated magnesium silicate have been used in large quantities as powder materials for face powder. However, these flaky fine powders used as extender pigments alone do not have desirable properties such as adhesion to the skin and spreadability, so the white powders currently in practical use are In addition to flaky fine powder, titanium oxide,
At present, powder materials such as metal soap and calcium carbonate are used, and desired properties are imparted to the flaky fine powder by appropriately combining these materials.

The present inventor has conducted intensive research to find an extender pigment for white powder that has excellent adhesion and spreadability to the skin, has covering power, and provides desired gloss and transparency when applied to the skin. A useful barium sulfate coated flake pigment has been successfully provided. That is, the present invention provides a novel extender pigment that is made by depositing barium sulfate on the surface of flaky fine powder and has excellent adhesion and spreadability, is non-toxic, and has excellent transparency when applied.

The present invention will be explained in detail below.

The flaky fine powder (substrate) used in the present invention includes micas such as muscovite and sericite, which are conventionally used as raw materials for white powder, as well as fine powders such as talc and kaolin. However, the flaky pigment according to the present invention is characterized in that the surface of these flaky fine powders is coated with barium sulfate. The size of the flaky substrate particles is 1 μm to 100 μm, preferably 50 μm.
The following are used:

The barium sulfate coated flaky pigment according to the present invention is
It can be most preferably produced by the production method of the present invention described below.

That is, according to the production method of the present invention, the flaky fine powder described above is first suspended in water, and then (a) an aqueous solution containing barium ions and (b) an aqueous solution containing sulfate ions are added thereto. By adding and (b) simultaneously or sequentially with either (a) or (b) first, barium sulfate is deposited on the surface of the flaky fine powder.

Examples of the aqueous solution containing barium ions in (a) above include barium chloride, barium hydroxide,
Aqueous solutions of barium nitrate, barium sulfide, etc. are used. Among these barium compounds, barium chloride is a preferred compound in terms of availability, price, purity, and the like. Examples of the aqueous solution containing sulfate ions in (b) above include sulfuric acid, sodium sulfate, potassium sulfate, sodium hydrogen sulfate,
Aqueous solutions of potassium hydrogen sulfate, magnesium sulfate, etc. are used.

To explain the above production method more specifically, according to one embodiment of the present invention, for example, 10 parts of the above flaky substrate is suspended in 100 parts of water, and 5 to
At 100°C, preferably 20 to 80°C, a 5 to 25% by weight aqueous solution of the above sulfuric acid or sulfate and a 5 to 25% by weight aqueous solution of the above barium salt in an amount of 0.8 to 0.98 equivalent to the sulfuric acid or sulfate. , added dropwise while stirring. After the addition is complete, the mixture is filtered to separate the solid product and washed with water. After washing with water, dry at 105-110°C for 8 hours.

The resulting product is a flaky pigment in which the surface of the flaky substrate is coated with barium sulfate.
This pigment itself has excellent adhesion and spreadability as a flaky pigment, and is also extremely excellent in gloss and transparency when applied.

The amount of barium sulfate deposited on the surface of the above-mentioned flaky substrate can be arbitrarily changed in order to obtain the desired extensibility and adhesion to the skin.

Further, by depositing an inorganic or organic white or colored compound on the surface of the flaky pigment described above, a more useful material for cosmetics can be produced.

As a modification of the above production method, instead of adding the aqueous solution containing barium ions in (a) above, barium hydroxide or barium salts are directly added, or in (b) above, containing sulfate ions. Instead of adding an aqueous solution, there is a method of directly adding sulfuric acid or sulfate. These modified methods are also suitable as a method for producing the barium sulfate-coated flaky pigment according to the present invention.

Examples and practical examples of the present invention are listed below.
The present invention will be explained in more detail.
It is not limited to these specific examples.

Example 1 50 g of muscovite with a diameter of 1 to 15 microns was suspended in 500 ml of water, heated to 25°C, and mixed with barium chloride while stirring.
Added 30g. To this suspension, 200 ml of a 10% by weight aqueous sodium sulfate solution was added dropwise at a flow rate of 2.5 ml/min, and after the addition was completed, the mixture was stirred for an additional 20 minutes. The resulting product is precipitated, filtered, and washed with water to remove salts, after which approximately 105
Dry at ~110°C for 8 hours. The white powdery product obtained in this way has good extensibility and adhesion, and X-ray diffraction and electron microscopic observation confirmed that fine barium sulfate particles were smoothly coated on the muscovite surface. It was done.

Example 2 50 g of muscovite with a diameter of 1 to 15 microns was suspended in 500 ml of water, heated to 60°C, and while stirring, 300 ml of a 10 wt% aqueous solution of barium chloride and 200 ml of a 10 wt% aqueous potassium sulfate solution were added at a flow rate of 3.3 ml. /min and 2.5ml/min simultaneously. After the addition is complete, stir for an additional 20 minutes. The resulting product was precipitated, filtered, washed with water to remove salts, and dried at about 105-110°C for 8 hours. In this way, a white powdery product with good spreadability and adhesion was obtained.

Example 3 50 g of muscovite with a diameter of 1 to 15 microns was suspended in 500 ml of water, heated to 25°C, and while stirring, 300 ml of a 10% by weight aqueous solution of barium chloride and 200 ml of a 10% by weight aqueous magnesium sulfate solution were added at a flow rate of 3.3 ml. /min and 2.5ml/
Drop simultaneously in minutes. Stir for 20 minutes after the addition is complete. The resulting product was precipitated, filtered, washed with water to remove salts, and dried at about 105-110°C for 8 hours. In this way, a white powdery product with good spreadability and adhesion was obtained.

Example 4 50 g of sericite with a diameter of 1 to 20 microns was suspended in 500 ml of water, heated to 60°C, and diluted with dilute hydrochloric acid to pH 1 with stirring.
10% by weight barium chloride aqueous solution prepared in ~2 300
3.3 ml and 200 ml of 10 wt% sodium sulfate aqueous solution
Drop simultaneously at ml/min and 2.5 ml/min. After the addition was completed, the mixture was further stirred for 20 minutes to precipitate it, filtered, washed with water to remove salt, and then dried at about 105 to 110°C for 8 hours. The white powdery product thus obtained had good spreadability and adhesion.

Example 5 50g of talc with a diameter of 1 to 20 microns was added to 500ml of water.
Suspend in a mixed solution of 10ml of alcohol, warm to 25℃, and add 10% by weight barium chloride aqueous solution 300ml while stirring.
3.3 ml and 200 ml of 10 wt% sodium sulfate aqueous solution
Drop simultaneously at ml/min and 2.5 ml/min. After the addition is complete, stir for an additional 20 minutes. The resulting product, after being precipitated, filtered, and washed with water to remove salts, has a
It was dried at 105-110°C for 8 hours. The white powdery product thus obtained had good spreadability and adhesion.

Example 6 The same procedure as in Example 2 was carried out except that muscovite with a diameter of approximately 5 to 25 microns was used in place of the muscovite with a diameter of approximately 1 to 15 microns used in Example 2, and a material with good extensibility and adhesion was obtained. A white powdery product was obtained.

Example 7 The same procedure as in Example 2 was carried out except that muscovite with a diameter of approximately 10 to 60 microns was used in place of the muscovite with a diameter of approximately 1 to 15 microns used in Example 2, and a material with good extensibility and adhesion was obtained. A white powdery product was obtained.

Practical Example 1 50 g of the pigment obtained in Example 1 was suspended in 500 ml of water, heated to 70°C, and while stirring, 90 ml of a 10 wt% aluminum sulfate aqueous solution was mixed with a 10 wt% sodium hydroxide aqueous solution to pH 6.0 to 8.0. After coating with aluminum hydroxide, add and dissolve 2g of Rhodamine-B, gradually add a 20% by weight aqueous solution of tannic acid, and spot the liquid in the reaction tank on paper to slightly remove the dye. Add until it oozes. Next, add a 10% by weight aqueous solution of tartarite in the same manner until the oozing is completely stopped, complete the lake formation, wash with water as much as necessary, filter, and dry. In this way, a flaky pigment coated with barium sulfate and a dye lake were obtained.

Practical example 2 90g of barium sulfate coated mica obtained in Example 1
Suspended in 900 ml of water with stirring, add 55 g of ferric ammonium sulfate, 10 g of magnesium sulfate and 80 g of urea.
g was added and heated at a temperature of 95°C to 98°C for 1 hour while stirring. The resulting precipitate was filtered, washed with water to remove salt, and then dried at about 105-110°C. The pigment thus obtained exhibited the yellow color of iron oxyhydroxide, was transparent, and had excellent dispersibility.

Practical example 3 Extender pigment obtained in Example 1 63.5g Color pigment 5.0g Lanolin 8.0g Isopropyl myristate 4.0g Calcium stearate 2.5g Cornstarch 17.0g The compact powder thus obtained has good extensibility and adhesion. It was hot.

Claims (1)

[Scope of Claims] 1. A flaky pigment characterized by using flaky fine powder as a substrate and coating the surface with barium sulfate. 2 Suspend the flaky fine powder in water, add (a) an aqueous solution containing barium ions and (b) an aqueous solution containing sulfate ions, or add (a) and (b) simultaneously, or (a) A method for producing a flaky pigment coated with barium sulfate, which comprises depositing barium sulfate on the surface of a fine flaky powder by sequentially adding either one of (b) and (b) under stirring.