JPS6393707A - Cosmetic - Google Patents

Abstract

PURPOSE:To produce a cosmetic having excellent hydrophilic nature and surface gloss and capable of giving smooth feeling and good spreadability to the skin, by bonding inorganic powder in the form of spheres and coating the surface with ultrafine powder only by mixing and stirring. CONSTITUTION:One ore more kinds of inorganic powder such as silica, calcium silicate, aluminum silicate, bentonite, mica, titanium mica, etc., are bonded to form a sphere and the surface of the obtained spherical core substance is coated with another ultramicro-pulverized powder (e.g. inorganic powder such as silica, titanium oxide, talc, etc., resin, pigment, gold, copper, etc.) only by mixing and stirring absolutely without using a bonding agent such as binder. The particle diameter of the core substance is preferably about 0.1-30mu and that of the ultrafine powder for coating is preferably 0.005-5mu.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is characterized by the fact that the spherical core material, which is the core, has a finely divided material that has excellent hydrophilicity and surface gloss, and provides smoothness and stretchability to the touch. This invention relates to cosmetics produced by coating the surface with powder.

[Prior art]

Conventionally, cosmetics in which the surface of a core substance is coated with another fine powder use a thermoplastic resin as the core base material, which is then coated with metals, metal oxides, metal compounds, pigments, and other fine powders. Ta. An example is JP-A-61-194010.

[Problem that the invention seeks to solve]

Thermoplastic resins have a coarse particle size of 30 microns on average, and have a wide particle size distribution, making it difficult to obtain uniform and stable products, making them unsuitable for use as cosmetics. Furthermore, when a thermoplastic resin is used as a base material and its surface is coated with metal, pigment, or other fine powder, it is common to add a binder as a binder in addition to the base material and the fine coating powder. . However, this binder melts when a considerable amount of heat is applied, and the coated fine powder is likely to peel off.

In addition, polyethylene spherical particles may melt when heated, which limits their use, and PMMA
The spherical particles are susceptible to solvents such as alcohol, so their uses are limited.

In view of these points, the present invention provides a uniform and stable cosmetic that does not undergo thermal changes, has excellent resistance to chemicals such as solvents.

Means for Solving Problem C] The present application combines one or more kinds of inorganic powders instead of thermoplastic resins to form spherules, and then coats one or more kinds of ultrafine powders on the surface without using any binders such as binders. It is coated by mixing and stirring without using it.

[Effect]

Mixing an inorganic powder that has been spheroidized to a particle size of 0.1 to 30 microns and a coating fine powder that has been ultrafinely pulverized to a particle size of 0.005 to 5 microns, and adding a stirring action to the mixture. Using the spheroidized inorganic powder as a base material, a strong coating layer of fine coating powder is formed on the surface of the base material. In other words, the inorganic powder method and the fine coating powder made into ultra-fine particles by the action of mixing and stirring are combined with the intermolecular force and electrostatic bond between the two particles, as well as the innumerable fine particles formed on the surface of the inorganic powder method. The adsorption effect of the pores also promotes agglomeration of the coating fine powder onto the surface of the base material. In addition, in the case of a fine powder with a low melting point, such as a resin, as a coating material, the surface temperature of the resin fine powder particle partner for inorganic powder method and coating will be increased by mixing and stirring, and activation due to heat and heat will increase. At the same time, the fine resin powder becomes molten and is welded to the surface of the inorganic powder sphere of the base material to form a coating layer. For cosmetics, oils, fats, pigments, fragrances, etc. are further added and mixed, and then the particle size is adjusted as necessary to produce a product.

〔Effect of the invention〕

Cosmetic materials coated with ultrafine coating powder using an inorganic powder method have excellent properties in the following points. That is, it has good color and gloss, good UV protection effect, good spreadability, good mixability with other cosmetic powders and liquids, and good feel on the skin. Furthermore, by using spheroidized inorganic powder as the base material, the amount of coating on the base material can be significantly increased due to the adsorption effect of the countless pores formed on the surface of the inorganic powder spheres. As a result, the weight ratio of the base material was 40% and the coating material was 60%. This is a large effect compared to the conventional method, in which the weight ratio of the coating material was at most 20%. In addition, it is possible to form a new coating layer using another fine powder on the coating layer that has been coated once, as long as the weight ratio of the coachine material does not exceed 60%.
It is also possible to cover a water-repellent coating material with a hydrophobic coating material to make it hydrophobic or to increase oil absorption.

〔Example〕

Silica spheres were used as the spherical particles of the base material, and ultrafine titanium oxide fine powder was coated on the surface of the silica spheres as a coating material. Figure 1 shows the situation.

The composition ratio of the image material is 80% silica spheres and 20% titanium oxide in terms of weight.

a, Silica sphere water content 2% or less PH7-9 Specific gravity 0.9 Average particle size 2 μm Melting point 1200°C or moreb, Titanium oxide crystal type Rutile type surface properties Hydrophilic specific surface area Approximately 150 rn'/, 9 Average particle Diameter: 15°Cm Loss on drying: 3.0% or less Loss on ignition: 7.0% or less Next, using the silica spherical particles coated with titanium oxide, (1) powder foundation,
(2) A method for producing an oil-based foundation will be explained. Titanium silica is a spherical particle made by coating the surface of a silica sphere with ultrafine particles of titanium oxide, and Super Micron Mica (Honkawa Micron (trade name)) is an ultrafine particle of mica.

(1) When producing a powder foundation, first, the raw materials (g) are mixed for 10 minutes in a mixer (Honkawa Micron ■, trade name Nauta Mixer). Next, feed the raw material IB) into an emulsifying machine (Honkawa Micron (trade name: Dispa Mill)).
When the temperature reaches 60° C., it is sprayed from the top of the mixer using a spray device attached to the mixer, and mixed with raw material 4 until it becomes crumbly (about 15 minutes). At this time, mixing can be promoted by maintaining the temperature inside the mixer at 60°C to 70°C. In addition, for dispersion, stirring may be performed using a stirring blade attached to the bottom of the mixer.

Further, about 5% water is added to raw material C), mixed, dried while stirring, and then mixed uniformly with raw material (2).

This is taken out and crushed in a crusher (Honkawa Micron Co., Ltd., trade name: FIFMIL) to adjust the particle size and produce a product.

(4 Raw materials for producing oil-based foundation (Q)
Fragrance: 0.3% First, mix the raw materials (g) with a mixer (for example, Nauta mixer).
Mix for 7 minutes.

Next, raw material (B) is added to an emulsifying machine (for example, the above-mentioned Dispa Mill).
Stir to emulsify at 80°C, spray into the mixer, heat the mixer to 90°C, and mix for about 5 minutes. Then, lower the temperature of the mixer to 50℃ and raw material C)
After adding and mixing for about 5 minutes, the temperature was further increased to 20°C, and the product was taken out.

As examples of the present invention, methods for producing powder foundation and oil-based foundation have been described above, and the results of comparing these two products with conventional commercially available products are shown in the table below. This is the result of asking 50 women to perform sensory evaluations over a 6-month period, and the evaluation items were 6 items: spreadability, gloss, texture, feel, transparency, and overall evaluation. In addition, A indicates the titanium-silica compounded product of this example, B indicates the conventional compounded product,
If A>B, A is better than B, and if A=B, it means that they are of the same level and do not differ much.

[Brief explanation of the drawing]

FIG. 1 is a microscopic photograph of the cosmetic of this example.

Claims (3)

[Claims] (1) A cosmetic in which one or more kinds of inorganic powders are bonded together and the surface of inorganic spherical particles used as a base material is coated with one or more kinds of other ultrafine powders. (2) The inorganic powder may include silica, calcium silicate, aluminum silicate, magnesium silicate, titanium oxide,
Zinc oxide, chromium oxide, cobalt oxide, iron oxide, zirconium oxide, alumina, aluminum hydroxide, chromium hydroxide, barium sulfate, bismuth oxychloride, talc, kaolin, manganese, bentonite, mica, titanium mica, etc., are prepared with a particle size of 0. The cosmetic according to claim (1), which is spheroidized to a size of 1 to 30 microns. (3) The fine powder for coating includes silica, calcium silicate, aluminum silicate, magnesium silicate, titanium oxide, zinc oxide, chromium oxide, cobalt oxide,
Inorganic powders such as iron oxide, zirconium oxide, alumina, aluminum hydroxide, chromium hydroxide, barium sulfate, bismuth oxychloride, fatty acid salts, talc, kaolin, manganese, bentonite, mica, titanium mica, organic compounds such as resins, oils and fats, Gold, copper, aluminum, pigments, etc. with a particle size of 0.
The cosmetic according to claim (1), which is made into ultrafine particles of 0.005 to 5 microns.