JPS6327410A - Cosmetic - Google Patents

Abstract

PURPOSE:Particles of thermosetting silicone resin of a specific particle size are coated with superfine particles of titanium oxide, iron oxide or other pigments on their surface, thus having good hydrophilic nature and surface gloss and showing excellent smoothness and spreadability as a cosmetic. CONSTITUTION:Particles of thermosetting silicone resin of 1-5 micron diameter and superfine particles of pigments such as titanium oxide, iron oxide and others of 0.1-0.001 micron particle size are mixed by stirring, until they are thoroughly dispersed, then rubbed with each other under pressure to give a thermosetting silicon resin coated with a pigment. The product is mixed with oil, pigments, perfumes; when needed, the mixture is adjusted in its particle size to give the objective cosmetic. The resultant cosmetic is all excellent in color, gloss, ultraviolet-cutting effect, spreadability on skins, compatibility to other kinds of cosmetics and fitness to skins. Further, the pigment-coating layer is treated with a fatty acid, then another coating layer is formed thereon to increase the oil absorption.

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) (Problems to be solved by the invention) ``This thermoplastic resin has a coarse particle size of 10 microns on average and a wide particle size distribution, making it difficult to obtain a uniform and stable product, making it suitable for use as a cosmetic. It wasn't.

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 the ingredients but also crushing the ingredients, making it more effective for coarse particles.

This pulverization effect varies depending on the rotation speed, but in a screen mill, particles with a size of 5 or more have a high probability of being pulverized.

Therefore, nylon powder, which is currently said to be the best thermoplastic resin, has an average grain size of 110ξD, so when it is run through a screen mill for mixing, its spherical surface will be damaged. At the same time, even if the material is temporarily coated with two pigments, the impact of the hammer of the screen mill may cause partial peeling or uneven thickness adhesion, reducing the product value.

In addition, spherical particles with a diameter of 10 mm or more do not adhere well to the skin, and even the slightest mistake in blending can cause them to peel off from the skin, which is the biggest complaint.

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 susceptible to solvents such as alcohol, which limits their use. Met.

(Means for solving the problem) This application replaces thermoplastic resin with thermosetting silicone resin, changes the hydrophobicity and water repellency of silicone resin to hydrophilicity by coating with ultrafine pigment particles, and gives a glossy surface to the silicone resin. The surface of spherical particles of thermosetting silicone resin is coated with ultrafine titanium oxide, iron oxide, and other pigments to give it a smooth feel and spreadability.

(Function) Thermosetting silicone resin with a particle size of 1 to 5 microns is mixed and stirred to be sufficiently dispersed, and then left to stand, with a particle size of 0.1 to 0.0, ooi.
Pigments such as titanium oxide and iron oxide, which have been made into ultra-fine particles, are emulsified and mixed with a solvent until they reach a predetermined temperature, and then sprayed and mixed onto the thermosetting silicone resin to form ultra-fine particles on the surface of the silicone resin. After the pigment is coated and the fragrance is added and mixed, the particle size is adjusted using a crusher and the product is made into a product.

(Effects of the Invention) Pigment-coated silicone spherical fine particles have good properties that cover 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.

It was also found that even when the particles were subjected to a screen mill for compounding, the particle size was 5 microns or less, so the particles were not damaged and the coating hardly peeled off.

In addition, pigment-coated silicone spherical particles have
After coating ultrafine particles of titanium oxide and iron oxide with fatty acids such as stearic acid and lauric acid, titanium oxide,
It is possible to form another coating layer on the coating layer of pigment particles such as iron oxide, thereby making it hydrophobic again and also increasing 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 recycled 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 moromi/g Average particle size 15 nm Loss on drying 3.0% or less Loss on ignition 7.0% or less (Example 2 ) The method for manufacturing cosmetics using the pigment-coated silicone spherical particles will be explained in terms of (1) powder foundation and (oil-based foundation).Titanium silicone refers to ultrafine particles of titanium oxide mixed with silicone resin. There is a coating on the surface.

(1) When producing powder foundation When the temperature reaches 60°C, spray from the top of the mixer using the spray device attached to the mixer, and mix with the raw material (e) 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. Also, about 5% water is added to raw material 0 to make a product.

■ When manufacturing oil-based foundation, first, raw materials (
6) in a mixer (for example,
tl! '#ky' 4 x /,.

Stir and emulsify the mixture using a 90° C. spray bottle, and when the temperature reaches 80° C., spray the mixture 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℃, raw material O was added and mixed for about 5 minutes, and then the temperature was further lowered to 20℃.
After cooling to 0°C, 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 at the same level and there is not much difference. .

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the cosmetic of this example, and in Figure 2, a... silicone resin, b... titanium oxide, C... ...Additive particles such as fragrances. Figure 1 Figure 2 Figure 3 Figure 4 - Dego lIMfu] 1μ Procedural amendment 1, Indication of the case 1985 Patent Application No. 170334 2, Name of the invention Cosmetics 3, Person making the amendment Case and Relationship (patent applicant) Address: 2-14-5 Ichioka, Minato-ku, Osaka 552 Name
Tsunakawa Powder Engineering Research Institute Co., Ltd. 4, Date of amendment order
Voluntary motion 6. Contents of amendment (1) The statement "It is a product with a particle size of 1 to 5 microns" in lines 4 to 12 of page 4 of the specification has been corrected as follows. Masu. "Thermosetting silicone resin with a particle size of 1 to 5 microns and ultrafine titanium oxide, iron oxide, and other pigments with a particle size of 0.1 to 0.001 micron are mixed and stirred, thoroughly dispersed, and then compressed. When rubbed, the temperature of the particle surfaces of both the silicone 4 sealant and the coating particles increases, and thermal activation occurs between the two particles.In this way, the surface of the silicone resin can be coated with the ultrafine particles. After adding and mixing oils and fats, pigments, fragrances, etc., the particle size is adjusted using a crusher as necessary to produce a product.'' (2) [Cyclodextrin] on page 7, line 6 of the specification is ``cyclodextrin.'' I will correct it.

Claims (1)

[Claims] Consists of spherical particles coated with one or more types of ultrafine titanium oxide, iron oxide, and other pigments with a particle size of 0.1 to 0.001 micron on the surface of a thermosetting silicone resin with a particle size of 1 to 5 microns. Cosmetics.