JPS6368513A - Cosmetic - Google Patents

Abstract

PURPOSE:A smooth cosmetic, consisting of spherical particles obtained by coating the surface of a thermosetting silicone resin with ultrafine particulate titanium oxide, iron oxide, fine metal powder and other pigments and having improved hydrophilicity and surface glossiness as well as good extensibility. CONSTITUTION:A cosmetic, consisting of spherical particles obtained by blending and stirring a thermosetting silicone resin having 1-20mu particle diameter with ultrafine particulate titanium oxide, metal compound, etc., having 2-0.001mu particle diameter, and metal fine powder, e.g. gold, silver, tin, aluminum, etc., and other pigments, thoroughly dispersing the blend, compressing and rubbing the dispersion to increase the temperature of the particle surfaces and cause activation by heat and coating the surface of the silicone resin with the ultrafine particulate above-mentioned particles, having excellent color and gloss and good ultraviolet ray cutting effect, extensibility, blending property with powder and liquid of other cosmetics as well as spreadability on the skin.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a cosmetic that has been improved to have excellent hydrophilicity and surface gloss, and to provide smoothness and spreadability to the touch.

(Prior Art) Cosmetics conventionally used are thermoplastic resins coated with titanium oxide, iron oxide, metal fine powder, and other pigments.

(Problems to be Solved by the Invention) This thermoplastic resin has a coarse particle size of 30 microns on average, and has a wide particle size distribution, making it difficult to obtain a uniform and stable product, making it unsatisfactory as a cosmetic.

In other words, the properties required of the spherical particles coated with the sample as cosmetics are color, gloss, cut of rays,
Good spreadability, good mixability with other cosmetic powders and liquids,
The factors included how well it adhered to the skin.

The pigment-coated spherical fine particles are generally used in cosmetics at a ratio of about 5 to 80%.

For this formulation, it is necessary to mix it uniformly with other ingredients, and a screen mill is generally used to achieve uniform mixing in the reduced area.

This screen mill has the effect of uniformly dispersing, but also pulverizes the ingredients, and is more effective for coarse particles.

This pulverizing effect varies depending on the rotation speed, but particles with a size of 5 microns or more are more likely to be pulverized in a screen mill.

Therefore, nylon powder, which is said to be the best thermoplastic resin at present, has an average particle size of 10 microns, so when it is run through a screen mill for mixing, its spherical surface will be damaged. Furthermore, even if pigment coating is applied, the impact of the hammer of the screen mill may cause partial peeling or uneven thickness adhesion, reducing commercial value.

Furthermore, when polyethylene spherical particles are subjected to a screen mill, they may melt due to the heat, which limits their use, and PMMA spherical particles are sensitive to solvents such as alcohol, which limits their use. there were.

(Means to solve the problem) We coated the silicone resin with ultra-fine particles to make it hydrophilic, give gloss to the surface of the silicone resin, and use spherical particles of thermosetting silicone resin to give it smoothness and elasticity. The surface of the body is coated with ultrafine particles of metal compounds such as titanium oxide and iron oxide, fine metal powders such as gold, silver, tin, and aluminum, and other pigments.

(Function) Thermosetting silicone resin with a particle size of 1 to 20 microns and ultrafine titanium oxide with a particle size of 2 to 0.001 microns.
Metal compounds such as iron oxide, fine metal powders such as gold, silver, tin, aluminum, and other pigments are mixed and stirred, sufficiently dispersed, and compressed and frictionally applied to raise the temperature of the particle surface, causing pigments to form due to heat. After adding and mixing , fragrance, etc., if necessary, the particle size is adjusted using a disintegrator and crusher to obtain a product.

It has good properties, covering all of the following points.

That is, it has a good color and gloss, a good effect on cutting radiance, a good spreadability, a good mixability with powders and liquids of other cosmetics, and a good feel on the skin.

In addition, even though the silicone resin is screen milled for compounding, even though the particle size is 5 microns or more, the silicone resin itself is extremely hard, so the particle surface is not damaged, and there is almost no peeling of the coating. It turns out.

In addition, the silicone spherical particles coated in this way are coated with fatty acids such as stearic acid and lauric acid on ultrafine particles of titanium oxide and iron oxide, and then coated with another coating layer on top of the previous coating layer. It is possible to form a coating layer, make it hydrophobic again, and also increase oil absorption.

(Example 1) The properties of the thermosetting silicone resin as the base material spherical particles and the titanium oxide as the ultrafine pigment coated on the surface of the spherical particles are as follows, and are shown in Figures 1 and 2. FIG. 3 shows a state in which the surface of silicone resin a is coated with titanium oxide b.

The blending ratio of the image material is silicone resin 80% by weight.
%, titanium oxide 20%.

a, Silicone resin water content 2% or less PH7-9 Specific gravity 1.3 Average particle size 2μm Weight reduction rate 2-3% 350℃〃 1
0-12% 900℃b, Titanium oxide crystal type Rutile type Surface properties Hydrophilic specific surface area Approximately 150 rn'/g Average particle size 15 nm Loss on drying 3.0% or less Loss on ignition 7.0% or less The method for manufacturing cosmetics will be explained in detail: (1) powder foundation and (2) oil-based foundation.Titanium silicone is a spherical particle made by coating the surface of silicone resin with ultra-7 fine particles of titanium oxide. Micron Mica (Hosokawa Micron■
, trade name) is mica made into ultrafine particles.

(1) When manufacturing powder foundation, first,
The raw materials were mixed for 10 minutes using a mixer (Hosokawa Micron ■, trade name: Nauta Mixer). Next, put Hara Q (Bl into an emulsifying machine (
Emulsify and mix with a Hosokawa Micron ■ (trade name Dispa Mill), and when the temperature reaches 60°C, spray from the top of the mixer with the spray device attached to the mixer until it becomes crumbly (about 15 minutes) with the raw material (5). ) mix. 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 the raw material (q), mixed, dried while stirring, and then mixed uniformly with the raw material (5).

This is taken out and crushed in a crusher (Hosokawa Micron ■, trade name: Finz Mill) to adjust the particle size and produce a product.

(2) Raw material (C) for producing oil-based foundation
Fragrance 0.3% First, raw materials (N) are mixed for 7 minutes using a mixer (for example, the Nauta mixer).

Next, the raw material (Bl) is added to an emulsifying machine (for example, the above-mentioned Disba Mill).
Stir and emulsify at 80°C, spray into the mixer, heat the mixer to 90'C, and mix for about 5 minutes. Then, the temperature of the mixer was lowered to 50℃ and the raw materials (
After adding C) and mixing for about 5 minutes, the temperature was further increased to 20°C.
After cooling to a certain temperature, take it out and use it as a product.

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 silicone compounded product of this example, B indicates the conventional compounded product, and if A) B, A is superior to B, and if A = B, it is the same level and does not change much. .

[Brief explanation of the drawing]

Figure 1 is a sectional view of the cosmetic of this example, Figures 2 and 3 are
The figure shows pigment-coated silicone spherical particles, and FIG. 4 is a micrograph of the silicone particles before coating. In the figure, a...... silicone resin, b...
......Titanium oxide, C...Additive particles such as fragrances.

Claims (2)

[Claims] (1) Consisting of spherical particles coated on the surface of thermosetting silicone resin with ultrafine metal compounds such as titanium oxide and iron oxide, fine metal powders such as gold, silver, tin, and aluminum, and one or more types of other pigments. Cosmetics. (2) The thermosetting silicone resin has a particle size of 1 to 20 microns, metal compounds such as titanium oxide and iron oxide, fine metal powders such as gold, silver, tin, and aluminum, and other pigments have a particle size of 2
~0.001 micron
Cosmetics listed in section.