JP2553473B2 - Method for producing powder solid cosmetic - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a powder solid cosmetic having sufficient strength, moldability, shape retention, and excellent feel even in a complicated shape.

[Conventional technology]

As a method for solidifying a powder cosmetic composition to obtain a powder solid cosmetic, generally, after filling the powder cosmetic composition into a container or a mold in which a container is set, pressing from one direction by a pressing mold. By doing so, a method of filling and solidifying in a container is performed.

On the other hand, conventional techniques for solidifying a powder cosmetic composition without using a container to obtain a powder solid cosmetic are roughly classified into a wet method and a dry method.

The wet method is a method in which the powder cosmetic composition is dispersed in a solvent, poured into a mold, and the solvent is volatilized by a method such as heating and drying to take out the solid powder cosmetic from the mold.

The dry method is a method in which a powder cosmetic composition is filled in a female mold of a rigid body such as metal, and then pressed from one direction by a male mold to extrude and take out the solidified powder solid cosmetic composition. Is.

[Problems to be Solved by the Invention]

The powder solid cosmetic obtained by the method of filling the powder cosmetic in a container or a mold in which the container is set and then filling and solidifying in the container by pressing from one direction with a pressing mold has a simple shape. It was limited to flat ones.

In addition, in the wet method without using a container, a special device for recovering the solvent is required, and the obtained powder solid cosmetic has a high porosity between the powders and at the same time is dense and dense. There was a problem that was inferior.

Furthermore, in the dry method that does not use a container, since the pressing direction is one direction, strong friction occurs between the wall surface of the mold and the powder cosmetic composition or between the powder cosmetic compositions, and the pressure is uniform. It may have the drawback that it cannot be communicated to. That is, the vertical pressure applied by the friction with the wall surface decreases exponentially with respect to the length, so that a long pillar in the height direction where the ratio of diameter to height exceeds 1: 1 I couldn't mold it. In addition, the obtained powder solid cosmetic has a problem that only a horizontal cross section having the same shape as the male pressing surface can be obtained.

It is an object of the present invention to provide a method for producing a powder solid cosmetic having sufficient strength, moldability, shape retention and excellent feel even in a complicated shape.

[Means for solving the problem]

The present invention fills a powder cosmetic composition in a mold made of an elastic body, tightly seals the mold, and then isotropically pressurizes the mold with a liquid pressure to make the powder cosmetic in the mold. A method for producing a powder solid cosmetic, comprising compressing and molding a cosmetic composition.

The elastic body used in the present invention is, for example, natural rubber, chloroprene rubber, acrylonitrile-butadiene rubber, styrene-butadiene rubber, urethane or the like.

It is one of the features of the present invention that the shape of the mold used in the present invention can be molded in any complicated shape, but the thickness of the mold is
Although it depends on the material and hardness of the elastic body, it is preferably 1 mm to 20 mm. If it is less than 1 mm, the original mold will be deformed when pressurized, and if it exceeds 20 mm, the pressure may not be applied uniformly. It is convenient in terms of work to use a rigid body made of metal or the like as a lid and fill the powdered cosmetic composition or take out the molded solid cosmetic from the portion.

The powder cosmetic composition used in the present invention comprises an inorganic pigment as a main component, an oil agent, a surfactant, a humectant, an organic colorant, a fragrance, etc., added thereto and uniformly mixed by a conventional method. That is. The inorganic pigment as the main component includes, for example, talc, titanium oxide, kaolin, iron oxide and the like, and usually accounts for 80 to 100% by weight of the powder cosmetic composition. The present invention is particularly characterized in that 100% by weight of the inorganic pigment (hereinafter abbreviated as wt%), that is, a powder solid cosmetic excellent in shape retention, etc., can be obtained even in the absence of a binder such as an oil agent. one of. In order to fill the mold with the powder cosmetic composition as uniformly as possible, a method of filling the mold while vibrating the mold can be used. When sealing the mold, it is preferable to remove as much air as possible, and depending on the case, an air bleeding step may be performed after sealing.

As the liquid used for the pressure solvent of the present invention, liquid oil, glycerin and the like can be used, but water and an aqueous solution of boric acid are usually used from the viewpoint of workability and the like.

All of the molds can be submerged and pressurized, but a part (particularly, the inlet of the powder cosmetic composition) can be fixed to a pressurizer to improve workability.

Range of pressure applied depends inorganic pigment used, but is usually in the range of ^{50kg / cm 2 ~4000kg / cm 2} . If the pressure applied is less than 50 kg / cm ² , the strength of the obtained powder solid cosmetic material is not sufficient, and if it is 4000 kg / cm ² or more, it is too hard and the usability becomes unfavorable.

Since the feature of the present invention is that the pressure is applied from the same direction, it can be molded in any shape, for example, spherical shape, abacus ball shape,
Gourd shape and other three-dimensionally complex shapes can be molded with sufficient strength.

The powder solid cosmetics which can be prepared by the production method of the present invention,
Examples include solid (stick-shaped) foundations, eye shadows, blushers, eye lines, antiperspirants and the like.

In the present invention, in addition to the above components, antiseptics, antioxidants and the like can be appropriately added.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to examples. Incidentally,% in the examples means% by weight. The moldability test, shape retention test, and sensory evaluation test used for evaluation in the examples are as follows.

(1) Moldability test Observe the condition when taken out from the mold.

When there is a part in the powder state or when there are cracks, etc. (×) When a solid material of the desired shape without cracks is obtained (○) (2) Shape retention test Impact resistance powder The body-solidified cosmetic was dropped from a table with a height of 30 cm onto a wooden table, and the number of drops when the cosmetic was cracked or missing was evaluated.

When cracks etc. occur with less than 3 drops (×) When cracks occur with 3 to 5 drops (△) When no cracks occur with 5 drops (○) Stable over time After storing powder solid cosmetics in a constant temperature bath at 45 ℃ for 3 months,
Observe the condition of the product.

When there are cracks (x) When there are slight cracks (△) When there is no cracks and when it does not change from the original (○) (3) Sensory evaluation test We conducted a test with 20 female subjects, each of the following items The test was conducted.

Examples 1 to 4 (Solid powder foundation) (Production method) A uniformly mixed powder cosmetic composition was filled into a mold, and the openings at both ends of the mold were sealed with stoppers made of the same material. After completely immersing this mold in the water tank of the wet rubber press machine,
A pressure of 30 kg / cm ² was applied until reaching 300 kg / cm ² , and then the pressure was reduced to 20 kg / cm ² per second to return to normal pressure.

Next, this mold was taken out of the water tank and the plug was removed to obtain a solid foundation.

(Formulation) Formulation of a powder foundation composition which does not use the oily binder used in Examples 1 and 2 (Formulation A),
Table 1 shows the formulation (formulation B) of the powder foundation composition using the oily binder used in Examples 3 and 4.

(Shape, material, etc. of mold used) As shown in Fig. 1, Fig. 2 and Table 2, it is a hollow cylindrical mold having upper and lower stoppers.

(Molded product) Table 2 shows the shape, outer diameter, length, etc. of the obtained molded product.

(Characteristics) are shown in Table 2. As is clear from Table 2, a molded product obtained by using the powder foundation composition containing no oily binder had an outer diameter of 18 mm and a length of 18 mm.
Of the solid foundation of Example 2 having an outer diameter of 18 mm and a length of 60 mm of the molded product obtained by using the powder foundation composition which does not use an oily binder similarly, has good moldability, It was also excellent in shape retention and sensory evaluation.

In addition, the powder foundation composition using an oily binder is solidified, and the obtained molded product has an outer diameter of 18 mm,
A molded product obtained by using the solid foundation of Example 3 having a length of 18 mm and the powder foundation composition similarly using an oily binder has an outer diameter of 18 mm and a length of 60 m.
The solid foundation with a long m-shaped stick also had excellent moldability, shape retention and sensory evaluation.

Comparative Examples 1 to 4 (solid powder foundation) Wet method (manufacturing method) A powder cosmetic composition prepared by uniformly mixing powder cosmetic compositions.
With respect to 50 parts by weight, 50 parts by weight of isopropyl alcohol was evenly dispersed to form a slurry, which was then poured from the upper part of the mold. After drying at 45 ° C for a whole day and night and confirming that isopropyl alcohol was completely volatilized by measuring the weight, the mold was turned upside down and the contents were taken out.

(Formulation) The powder foundation composition which does not use the oily binder used in Comparative Examples 1 and 2 is the same as that of Examples 1 and 2 (Formulation A), and the oily binders used in Comparative Examples 3 and 4 are used. The powder foundation composition used was the same as in Examples 3 and 4 (formulation B).

(Shape and material of mold used) As shown in Fig. 3, Fig. 4 and Table 2, the mold has no plug.

(Molded product) Table 2 shows the shape, outer diameter, length, etc. of the obtained molded product. In Comparative Examples 1, 2 and 4, when the contents were taken out from the mold, they were crushed into several small pieces, and a molded product could not be obtained.

(Characteristics) are shown in Table 2. The powder foundation compositions of Comparative Examples 1 and 2 which did not use the oily binder could not be molded into a solid mold. When the powder foundation composition using the oily binder of Comparative Example 3 was used, a solid foundation having an outer diameter of 18 mm and a length of 18 mm was obtained. The property was weak, and the sensory evaluation was low.

Further, even if the powder foundation composition using the oily binder was used, it was not possible to mold a stick-shaped solid foundation as is apparent from Comparative Example 4.

Comparative Examples 5 to 8 (Solid Powder Foundation) Dry Method (Manufacturing Method) One end of the female opening is fixed and sealed so that the surface of the same material is in close contact with a smooth plate, and then the opening on the opposite side is formed. After filling the powder cosmetic composition uniformly mixed from the above part, then inserting the male mold into the female mold and pressing with a pressure of 10 kg / cm ² for 2 seconds,
It returned to normal pressure. Next, the plate that had covered one end of the female mold was removed, and the male mold was slowly extruded to take out the contents.

(Formulation) The powder foundation composition which does not use the oily binder used in Comparative Examples 5 and 6 is the same as that of Examples 1 and 2 (Formulation A), and the oily binder used in Comparative Examples 7 and 8 is used. The powder foundation composition used was the same as in Examples 3 and 4 (formulation B).

(Shape, Material, etc. of Mold Used) As shown in FIG. 5, FIG. 6 and Table 2, the mold is composed of a pair of a cylindrical outer cylinder (female mold) and an inner core (male mold).

(Molded product) Table 2 shows the shape, outer diameter, length, etc. of the obtained molded product. In Comparative Examples 5, 6 and 8, many parts were extruded from the female mold in a powdery state, and a molded product could not be obtained.

(Characteristics) are shown in Table 2. The powder foundation compositions of Comparative Examples 5 and 6 which did not use the oily binder could not be molded into a solid shape. When the powder foundation composition using the oily binder of Comparative Example 7 was used, a solid foundation having an outer diameter of 18 mm and a length of 18 mm was obtained, but as is clear from Table 2, the shape retention is weak. The sensory evaluation was also low.

Further, even if a powder foundation composition using an oily binder was used, a stick-shaped solid foundation could not be molded, as is clear from Comparative Example 8.

Example 5 (Solid powder eye shadow) (Manufacturing method, prescription, shape of used mold, material, etc.) Same as in Example 2 except that the prescription of the powder cosmetic composition is C in Table 1. A stick-shaped solid eye shadow was obtained.

(Molded product) Table 3 shows the shape, outer diameter, and length of the obtained molded product.

(Characteristics) are shown in Table 3. As is apparent from Table 3, the stick-shaped solid eyeshadow obtained had good moldability and was excellent in shape retention and sensory evaluation.

Example 6 (solid powder antiperspirant) (Manufacturing method, prescription, shape of used mold, material, etc.) The same as in Example 2 except that the prescription of the powder cosmetic composition is D in Table 1. A stick-shaped solid powder antiperspirant was obtained.

(Molded product) Table 3 shows the shape, outer diameter, and length of the obtained molded product.

(Characteristics) are shown in Table 3. As is clear from Table 3, the obtained stick-shaped solid antiperspirant had good moldability, and was excellent in shape retention and sensory evaluation.

Example 7 (solid powder blusher) (Manufacturing method, prescription, shape of used mold, material, etc.) Thickness where material is acrylonitrile-butadiene rubber
10mm diameter on the surface of a spherical rubber ball with a diameter of 2mm and an inner diameter of 100mm
The hole was drilled and the uniformly mixed powder cosmetic composition shown in Formulation E of Table 1 was filled in the rubber ball with a vibrator while vibrating. After sealing the hole of the rubber ball with vinyl tape, completely immerse it in the water tank of the rubber press machine, pressurize at 50 kg / cm ² per second, and hold for 5 seconds when the pressure reaches 500 kg / cm ^2. Then 15 kg / cm ² per ^second
Then, the pressure was reduced to normal pressure.

Next, the rubber ball was taken out of the water tank and cut with a sharp cutter so as not to damage the inside to obtain a solid blusher.

(Molded product) Table 3 shows the shape and diameter of the obtained molded product.

(Characteristics) are shown in Table 3. As is apparent from Table 3, the obtained spherical solid solid blusher had good moldability and excellent shape retention and sensory evaluation.

Example 8 (Solid baby powder) (Manufacturing method, prescription, shape of used mold, material, etc.) Abacus bead-shaped mold with upper stopper shown in FIG. 7 in which the material is natural rubber and the thickness is 10 mm, After uniformly filling the powder cosmetic composition shown in Formulation F of Table 1, the upper opening was sealed with a plug of the same material. After completely immersing the mold in the water tank of the rubber press machine, pressurize at 40 kg / cm ² per second to 700 kg / cm
^When the pressure reaches ² , hold for 10 seconds, then 2 per second
The pressure was reduced to 0 kg / cm ² and returned to normal pressure.

Next, this mold was taken out of the water tank and cut into pieces using a sharp cutter so as not to damage the inside to obtain solid baby powder.

(Molded product) The shape and the like of the obtained molded product are shown in Fig. 8 and Table 3.

(Characteristics) are shown in Table 3. As is clear from Table 3, the special abacus bead-shaped solid baby powder had good moldability and excellent shape retention and sensory evaluation.

As described above, as shown in Examples, it is apparent that the present invention can provide a powder solid cosmetic having sufficient strength, moldability, shape retention and excellent feel even in a complicated shape.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

When manufacturing a powder solid cosmetic, a powder cosmetic is used without causing friction between the wall surface and the powder cosmetic composition by isotropically pressing in a liquid using an elastic mold. A pressure is applied to the composition in the vertical direction from the wall surface to obtain a powder solid cosmetic which is uniformly compression-molded.

The powder solid cosmetic obtained by the method of the present invention,
It has sufficient strength, moldability, shape retention and excellent feel even in complex shapes.

[Brief description of drawings]

FIG. 1 is a mold used in Examples 1 and 3, and FIG. 2 is a mold used in Examples 2, 4, 5, and 6.
FIG. 3 is a mold used in Comparative Examples 1 and 3, FIG. 4 is a mold used in Comparative Examples 2 and 4, and FIG. 5 is Comparative Example 5.
And a mold used in Comparative Example 7, FIG. 6 is a mold used in Comparative Examples 6 and 8, and FIG. 7 is a mold used in Example 8.
The figure shows the shape of the cosmetic material obtained in Example 8.

Claims (1)

(57) [Claims] 1. A powder in a mold made by filling a powder cosmetic composition in a mold made of an elastic body, tightly sealing the mold, and then isostatically pressing the mold with a hydraulic pressure. A method for producing a powder solid cosmetic, comprising compression-molding a cosmetic composition.