JP2921058B2 - Cosmetics containing non-porous spherical silica - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to cosmetics containing non-porous spherical silica.

[Prior Art] Conventionally, in order to improve the extensibility and adhesiveness of makeup cosmetics, fine spherical silicic anhydride (JP-A-54-55739) and spherical silica gel (JP-B-62-1) have been used.
4525) has been proposed. However, all of them are porous and have high oil absorbing properties, so that they absorb and adsorb other fats and oils and active ingredients. For this reason, there is a problem that the amount of fats and oils is increased.

On the other hand, there has been known a method of producing porous silica by firing porous silica gel in an electric furnace or a gas furnace.
However, silica produced by such a method causes fusion sintering of the particles during firing, and requires pulverization and classification operations for redispersion. In addition, the shape of the particles is generally spherical, but there is a problem that there are many irregular shapes. For this reason, it was unsuitable especially for use in cosmetics.

[Problem to be Solved by the Invention] An object of the present invention is to provide a cosmetic product that is soft and has good elongation.

[Means for Solving the Problems] The present invention provides a monodisperse nonporous spherical silica obtained by dispersing porous silica gel in a high-temperature gas, firing and making it nonporous, from 3 to 70%. An object of the present invention is to provide a cosmetic product characterized by being blended by weight.

The silica compounded in the cosmetic of the present invention is obtained by dispersing in a gas and firing silica gel.
For this reason, since the silica gels do not fuse with each other to form secondary particles, nonporous silica having excellent monodispersity can be obtained.
In addition, the shape of the silica particles obtained here is a sphere having a high sphericity because the calcination is performed in a state of not contacting the solid. Various firing methods can be employed. For example, a method of introducing silica gel into a high-temperature gas by pneumatic transportation can be used.

As the high-temperature gas, a temperature of 1000 ° C. or more is preferable. Ten
If the temperature is lower than 00 ° C., it is not preferable because the formation of nonporous hardly proceeds, and the desired spherical nonporous silica may not be obtained. On the other hand, if the temperature of the gas exceeds 2000 ° C., crystallization of silica may proceed, which is not preferable.

In the silica to be incorporated into the cosmetic of the present invention, the shape of the raw material porous silica gel to be subjected to the calcination treatment is not particularly limited. It is preferable because silica particles can be obtained. As the raw material porous silica gel, amorphous silica gel obtained by crushing silica gel having a large particle diameter can also be suitably used.

In the cosmetic of the present invention, the mixing ratio of the nonporous silica is 3 to 70% by weight. If the amount is less than 3% by weight, sufficient extensibility cannot be obtained. On the other hand, if it exceeds 70% by weight, the cosmetics become too hard.

The average particle size of the nonporous silica is preferably 1 to 20 μm. If the average particle size is less than 1 μm, it is not preferable because sufficient extensibility cannot be obtained. When the average particle size exceeds 20 μm, it is not preferable because it gives a rough feeling. It is more preferable that the average particle size is 3 to 10 μm.

The oil absorption of non-porous silica is 80 ml /
It is preferably 100 g or less. If the oil absorption exceeds 80 ml / 100 g, it is not preferable because a large amount of oil must be incorporated into cosmetics. More preferred oil absorption is 40ml / 100
g or less.

EXAMPLES Synthesis Example 1 Spherical porous silica gel having the physical properties shown in column a of Table 1 was dispersed in an air stream at 1400 ° C. and fired. As a result, nonporous silica having no secondary aggregation was obtained. The physical properties of this nonporous silica are shown in column b of Table 1.

The average particle size is determined by an electric detection zone method (trade name: Coulter counter), the pore volume and average pore diameter are determined by a nitrogen adsorption method, the specific surface area is determined by a nitrogen adsorption BET method, and the oil absorption is J.
Each was measured with IS K5101.

Synthesis Example 2 Spherical porous silica gel having the physical properties shown in column c of Table 1 was treated in the same manner as in Example 1 to obtain nonporous silica having no secondary aggregation. The physical properties of this nonporous silica are shown in column d of Table 1.

Example 1 Using the nonporous silica obtained in Synthesis Example 1, a makeup cosmetic having the following composition was prepared. However, the mixing ratio is% by weight.

Non-porous silica 32.8 Titanium dioxide 16.4 Iron oxide (red) 1.6 Solid paraffin 5.5 Carnauba wax 3.3 Liquid paraffin 37.1 Sorbitan monooleate 3.3 First, mix well the non-porous silica, titanium dioxide and iron oxide. About half of the liquid paraffin and sorbitan monooleate are added to the mixture, and the mixture is uniformly dispersed with a homomixer. The remaining components are heated and melted, and mixed well. This was poured into a container and solidified by cooling to obtain a makeup cosmetic.

Comparative Example 1 A cosmetic for makeup was obtained in the same manner as in Example 1 except that the nonporous silica of Example 1 was replaced with the spherical porous silica gel before firing used in Synthesis Example 1.

Comparative Example 2 A cosmetic for makeup was obtained in the same manner as in Example 1 except that talc was used instead of the nonporous silica of Example 1.

The three makeup cosmetics thus obtained were used by cosmetics passengers (seven women), and the following points were evaluated relative to each other on a five-point scale. Table 2 shows the results. Evaluation items were: 1) Hardness when picking up cosmetics (5:
Soft ~ 1: hard) 2) elongation of cosmetics (5: good ~ 1: bad) 3) oiliness at application (5: 1 ~ 1: no) 4)
Transparency after application (5: good to 1: bad).

Table 2 shows that the cosmetic of Example 1 is soft and has excellent elongation. There was an opinion that the cosmetic of Comparative Example 1 did not have oiliness during use, but felt somewhat powdery. This is presumably because the blended silica gel had a large oil absorption and the blended oil was absorbed.

[Effect of the Invention] The silica blended in the cosmetic of the present invention is a nonporous silica having a particle shape close to a true sphere and excellent in monodispersity. This silica has a low oil absorption. For this reason, the cosmetics of the present invention are soft and have good elongation.

Claims (1)

(57) [Claims] The present invention is characterized in that 3 to 70% by weight of monodisperse nonporous spherical silica obtained by dispersing porous silica gel in a high-temperature gas, firing and nonporous, is blended. Cosmetics.