JPH0256410A - Production of powdery and solid cosmetic - Google Patents

Abstract

PURPOSE:To obtain a powdery and solid cosmetic, capable of exhibiting sufficient strength, moldability, shape retaining properties, etc., even in a complicated shape by filling a powdery cosmetic composition in a mold made of an elastomer, hermetically sealing the mold, dipping the whole in a liquid and isotropically pressurizing the whole under a liquid pressure. CONSTITUTION:A powdery cosmetic composition is filled in a mold made of an elastomer (e.g., natural rubber, chloroprene rubber, styrene-butadiene rubber or urethane) in 1-20mm thickness and hermetically sealed with a plug of the same material. The whole is then dipped in a liquid (in a water tank of a wet rubber press) and isotropically pressurized under 50-4000kg/cm<2> liquid pressure to afford the subject cosmetic. The powdery and cosmetic composition is prepared by adding and mixing an oil, humectant, organic colorant, perfume, etc., with an inorganic pigment as a principal ingredient and the objective substance excellent in shape retaining properties is obtained even in the absence of a binder, such as oil, according to the above-mentioned method.

Description

[Detailed description of the invention] [Industrial application field] The present invention has sufficient strength and moldability even in complex shapes.

The present invention relates to a method for producing a solid powder cosmetic that has shape retention and excellent texture.

[Conventional technology]

The method of solidifying a powder cosmetic composition to obtain a solid powder cosmetic is generally to fill a container or a mold with a container set with the powder cosmetic composition, and then press it from one direction with a pressing die. A method of filling and solidifying the material into a container is carried out by doing this.

On the other hand, conventional techniques for obtaining solid powder cosmetics by solidifying powder cosmetic compositions without using a container are broadly classified into wet methods and dry methods.

The wet method is a powder makeup method: After dispersing the I composition in a solvent,
This is a method in which the body cosmetic material is poured into a mold and solidified by evaporating the solvent by heating and drying, etc. ↑5) The body cosmetic material is removed from the mold.

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

[Problem to be solved by the invention]

Powder solid cosmetics obtained by filling a container or a mold set with a container with powder cosmetics and then pressing from one direction with a pressing mold to solidify the powder solid cosmetics have a simple shape. It was limited to flat surfaces.

In addition, the wet method, which does not use a container, requires special equipment to recover the solvent, and the obtained solid cosmetic powder also has a high porosity and a high density between the powder particles. However, there was a problem that the strength was inferior.

Furthermore, in the dry method that does not use a container, the pressing direction is unidirectional, so strong friction occurs between the wall of the mold and the powder cosmetic composition or between the powder cosmetic compositions, resulting in uniform pressure. The disadvantage is that it cannot be conveyed to the public. In other words, the vertical pressure applied by friction with the wall decreases exponentially with the length, so a columnar object with a diameter-to-height ratio of more than 1:1 is Could not be molded. Further, the resulting powder solid cosmetic has a problem in that only those whose horizontal cross section has the same shape as the pressing surface of the male die are obtained.

The present invention has sufficient strength and moldability even in complex shapes.

The object of the present invention is to provide a method for producing a solid powder cosmetic having shape retention and excellent feel.

[Means to solve the problem]

The present invention involves filling a powder cosmetic composition into a mold made of an elastic body, tightly sealing the mold, and then pressurizing the mold evenly with hydraulic pressure, so that the powder cosmetic composition inside the mold is filled with the powder cosmetic composition. This is a method for producing a powder solid cosmetic, which is characterized by compression molding a 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.

One of the features of the present invention is that the shape of the mold used in the present invention can be molded into any complex shape, but the thickness of the mold is 1 mm to 20 mm, although it varies depending on the material and hardness of the elastic body.
It is preferable that If it is less than 1 mm, the original mold will deform when pressurized, and if it exceeds 20 mm, the pressure may not be applied uniformly.

It is convenient to use a part of the mold as a lid with a rigid body such as metal, from which the powdered cosmetic composition can be filled or the molded solid cosmetic can be taken out.

The powder cosmetic composition used in the present invention is a powder containing an inorganic pigment as a main component, to which an oil agent, a surfactant, a humectant, an organic coloring agent, a fragrance, etc. are added, and mixed uniformly by a conventional method. It's about. Examples of IaR-free materials that are main components include talc, titanium oxide, kaolin iron oxide, etc., and usually account for 80 to 100% by weight of the powder cosmetic composition. (abbreviated as wt%),
That is, one of the major features is that a solid powder cosmetic with excellent shape retention can be obtained even in the absence of a binder such as an oil agent. In order to fill the mold with the powder cosmetic composition as uniformly as possible, it is also possible to fill the mold while vibrating the mold. When sealing the mold, it is preferable to remove as much air as possible, and depending on the case, an air bleed process may be performed after sealing.

The liquid used in the pressure solvent of the present invention is liquid oil.

Although glycerin and the like can be used, water and an aqueous solution of boric acid or the like are usually used from the viewpoint of workability.

The mold can be flattened and immersed in water to pressurize it, but it is also possible to improve workability by fixing the negative part (particularly the inlet for the powder cosmetic composition, etc.) to a pressurizer.

The range of pressure to be applied varies depending on the inorganic pigment used, but is usually 50 kg/cm” to 4000 kg/cm.
m” range.The pressurizing pressure is 50kg/
If it is less than cm', the strength of the obtained solid powder cosmetic will not be sufficient, and if it is more than 4,000 kg/am'', it will be too hard and the feeling of use will be poor, which is not preferable.

The feature of the present invention is that pressure is applied from the same direction, so it can be molded into any shape. For example, objects with spherical, abacus, gourd, and other three-dimensionally complex shapes have sufficient strength. It can be molded by

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

In addition to the above-mentioned components, preservatives, antioxidants, etc. may be appropriately added to the present invention.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples. In addition, % of examples
means weight %. Also, the moldability test and shape retention test used for evaluation in Examples.

The sensory evaluation test is as follows.

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

When there are parts that remain in a powder state or when there are cracks, etc. (×,) When a solid material with the desired shape is obtained without cracks, etc.
(○) (2) Shape retention test ■ Impact-resistant powder solid cosmetics were dropped from a 3Qcm height table onto a wooden table, and evaluated by the number of drops when the cosmetics cracked or chipped. did.

When cracks, etc. occur after being dropped less than 3 times (×) When cracks, etc. occur after being dropped 3 to 5 times
(△
) When no cracks occur even after being dropped 5 times.
(○) ■ Oral stability #5) After storing the solid cosmetic in a constant temperature bath at 45°C for 3 months, observe the condition of the product.

When there are cracks, etc. (×) When there are slight cracks, etc. (△) When there are no cracks, etc. and there is no change from the original (0) (3) Sensory evaluation test A test was conducted with 20 female subjects, and each of the following items A test was conducted.

Item Evaluation Hardness □ Number of people who answered that it had sufficient hardness when grasped Feeling □ Number of people who answered that it spread well and adhered well when used Examples 1 to 4 (Solid powder foundation) (Manufacturing method) Mixed uniformly The powder cosmetic composition was filled into a mold, and the openings at both ends of the mold were sealed using plugs made of the same material.

After completely immersing this mold in the water tank of a wet rubber press machine, a pressure of 39 kg/cm" per second was applied to 300 kg/cm.
”, then 2 Qkg/Cm per second.”
The pressure was reduced to normal pressure.

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

(Formulation) Formulation of the powder foundation composition used in Example 1.2 without using an oil-based binder (Formulation A),
and the formulation of a powder foundation composition using the oil-based binder used in Examples 3 and 4 (Formulation B)
are shown in Table 1.

(Shape, material, etc. of the mold used) As shown in Fig. 1, Fig. 2, and Table 2, the mold was a hollow cylinder with plugs at the top and bottom.

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

(Characteristics) As shown in Table 2, the outer diameter of the molded product obtained using the powder foundation composition that does not use an oil-based binder is 113 mm.

The outer diameter of the molded product obtained using the solid foundation of Example 1 having a length of 18 mm and a powder foundation composition that similarly does not use an oil-based binder is 18 mm,
The stain-like solid foundation of Example 2 having a length of 60 mm had good moldability and was excellent in shape retention and sensory evaluation.

In addition, the powder foundation composition using an oil-based binder is solidified, and the outer diameter of the resulting molded product is 113 m.
m, the outer diameter of the molded product obtained using the solid foundation of Example 3 with a length of 18 mm and the powder foundation composition similarly using an oil-based binder is 18 mm.
The moldability of the long stain-like solid foundation with a length of 60 mm was excellent, and the shape retention and sensory evaluation were also good.

Comparative Examples 1 to 4 (Solid Powder Foundation) Wet Method (Manufacturing Method) The uniformly mixed powder cosmetic composition was converted into powder cosmetic composition 5.
The slurry was uniformly dispersed in 50 ffi parts of isopropyl alcohol based on 0 weight, and poured into a slurry from the top of the mold. After drying at 45° C. for a day and night and measuring the weight to confirm that the isopropyl alcohol had completely evaporated, the mold was turned upside down and the contents were taken out.

(Formulation) The powder foundation composition used in Comparative Example 1.2 without using an oil-based binder is the same as in Example 1.2 (formulation A), and the powder foundation composition used in Comparative Example 3.4 using an oil-based binder is the same as Example 1.2. The powder foundation composition used was the same as in Example 3.4 (formulation B).

(Shape, material, etc. of the mold used) As shown in Figures 3 and 4 and Table 2, the mold does not have a stopper.

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

In Comparative Examples 1.2 and 4, when the contents were taken out from the molds, they were broken into several small pieces, and no molded products could be obtained.

(Characteristics) Shown in Table 2. The powder foundation silicone composition of Comparative Example 1.2, which did not use an oil-based binder, could not be molded into a solid shape. When the powder foundation composition using the oil-based binder of Comparative Example 3 was used, a solid foundation with an outer diameter of 18 mm and a length of 18 mm was obtained, but as is clear from Table 2, the shape was not retained. Furthermore, even if a powder foundation composition containing an oil-based binder was used, a solid foundation in the form of a stick could be molded, as is clear from Comparative Example 4. I couldn't.

Comparative Examples 5 to 8 (Solid powder foundation) Dry method (manufacturing method) After fixing one end of the 4-shaped hole in close contact with a smooth plate of the same material and sealing it, open the hole on the opposite side. Fill the powder cosmetic composition evenly mixed with the first part, then insert the male mold into the female mold and fill it with 10 kg/cm. After pressing at a pressure of 2 seconds, the pressure was returned to normal pressure. Next, I removed the board that was blocking one end of the female mold and slowly pushed it out with the male mold to get the contents out.

(Formulation) The powder foundation composition used in Comparative Example 5.6 without using an oil-based binder was the same as in Example 1.2 (formulation A), and the powder foundation composition used in Comparative Example 7.8 using an oil-based binder was the same as Example 1.2. The powder foundation composition used was the same as in Example 3.4 (formulation B).

(Shape of mold used, material, etc.) As shown in Figures 5 and 6 and Table 2, a cylindrical outer cylinder (
This type consists of a pair of core (female type) and inner core (male type).

(Molded product) The shape, outer diameter, length, etc. of the obtained molded product are shown in Table 2.
In Comparative Examples 5, 6 and 8, many parts were extruded from the female die in powder form (and it was not possible to obtain a molded product).

(Characteristics) The powder foundation composition of Comparative Example 5.6 in which no oil-based binder was used, shown in Table 2, could not be molded into a solid shape. When the powder foundation composition using the oil-based binder of Comparative Example 7 was used, the outer diameter was 18 mm.

A solid foundation with a length of 18 mm was obtained, but as is clear from Table 2, the shape retention was weak (and the evaluation was low in the sensory evaluation as well).

Furthermore, even if a powder foundation composition containing an oil-based binder was used, as is clear from Comparative Example 8, a solid foundation silane in the form of a stick could not be molded.

Example 5 (Solid powder! Eye shadow) (Manufacturing method, prescription, shape of mold used, material, etc.) Same as Example 2 except that the formula of the powder cosmetic composition was 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 molded product obtained.

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

Example 6 (Solid powder antiperspirant) (Manufacturing method, formulation, shape of mold used, material, etc.) Same as Example 2 except that the formulation 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 molded product obtained.

(Characteristics) Shown in Table 3. As is clear from Table 3, the stain-like solid antiperspirant obtained had good moldability, and was also excellent in shape retention and sensory evaluation.

Example 7 (Solid powder blusher) (Manufacturing method, prescription, shape of mold used, material, etc.) A spherical rubber ball made of acrylonitrile-butadiene rubber with a thickness of 2 mm and an inner diameter of 100 mm was coated with a diameter of 10 m.
A hole of m diameter was made, and a uniformly mixed powder cosmetic composition shown in Formulation E in Table 1 was filled into the rubber ball while vibrating it with a vibrator. After sealing the hole in the rubber ball with vinyl tape, it was completely immersed in the water tank of the rubber press equipment, and then pressurized at 5Qkg/cm'' per second to 500
When the pressure reaches 100 kg/cm, hold it for 5 seconds,
The pressure was then reduced at a rate of 15 kg/Cm2 per second to return to normal pressure.

Next, this rubber ball was taken out from the water tank and cut into pieces using a sharp cutter without damaging the inside to obtain a solid blush.

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

(Characteristics) Shown in Table 3. As is clear from Table 3, the moldability of the obtained true spherical solid blush was good, and the shape retention was also excellent in the sensory evaluation.

Example 8 (Solid baby powder) (Manufacturing method, prescription, shape and material of the mold used, etc.) The material was natural rubber and the thickness was 10 mm. After uniformly filling the powder cosmetic composition shown in Formulation F in Table 1, the upper opening was sealed using a plug made of the same material.

After the mold was completely immersed in the water tank of the rubber press equipment, it was pressurized at 40 kHz/cm'' per second, held for 10 seconds when the pressure reached 700 kg/cm'', and then immersed at 20 kHz/sec.
g/cm" and returned to normal pressure.

Next, this mold was taken out of the water tank and cut into pieces using a sharp cutter without damaging the inside to obtain solid heavy powder.

(molded product) The shape etc. of the obtained molded product are shown in FIG. 8 and Table 3.

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

As shown in the examples above, it is clear that the present invention makes it possible to obtain a powder solid cosmetic having sufficient strength, moldability, shape retention, and excellent feel even in a complex shape.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

When producing solid powder cosmetics, an elastic mold is used and pressure is applied in the same direction in a liquid to separate the wall surface and powder cosmetics.
4 Pressure is applied to the powder cosmetic composition in the vertical direction from the wall surface without causing friction of the Mi product, and a powder solid cosmetic that is uniformly compression-molded can be obtained.

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

[Brief explanation of the drawing]

FIG. 1 shows the mold used in Example 1 and Example 3, and FIG. 2 shows the mold used in Example 2. Example 4. The mold used in Example 5 and Example 6, Figure 3 shows the mold used in Comparative Example 1 and Comparative Example 3, and Figure 4
The figure shows the mold used in Comparative Example 2 and Comparative Example 4, Figure 5 shows the mold used in Comparative Example 5 and Comparative Example 7, Figure 6 shows the mold used in Comparative Example 6 and Comparative Example 8, and Figure 7 shows the example date. The type used in
Figure 8 is a diagram showing the shape of the cosmetic obtained in Example 8.

Claims (1)

[Claims] After filling the powder cosmetic composition into a mold made of an elastic body and tightly sealing the mold, the powder cosmetic composition inside the mold is compressed isotropically using hydraulic pressure. A method for producing a powder solid cosmetic, which is characterized by compression molding.