JPS6253914A - Production of slid powdery cosmetic - Google Patents

Abstract

PURPOSE:To obtain a solid powdery cosmetic having excellent applicability to the skin and capable of accurately forming an arbitrary formed article having complicate shape in a short time, by kneading a powdery cosmetic containing a water-soluble polymeric compound with water, filling the mixture in a mold and solidifying and drying the mixture in a freeze-drier. CONSTITUTION:A powdery raw material is mixed thoroughly with a water-soluble polymeric compound and water and the mixture is filled in a forming mold. The mold is put into a freeze-drier and quenched from room temperature to <=-40 deg.C. The space in the freeze-drier or the mixture in the forming mold may be cooled to frozen state before putting the mold into the freeze-drier. The mixture is dried in vacuum while raising the temperature of the freeze-drier to obtain the objective powdery cosmetic having a complicate shape in a short time compared with conventional method. The obtained cosmetic can be removed easily from the brush, etc., and has excellent spreadability and applicability to the skin. The amount of the polymeric compound is preferably 0.05-5.0wt% based on the mixture and that of water preferably 10-250pts.wt. per 100pts.wt. of the produced formed cosmetic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing solid powder cosmetics such as foundations, eye shadows, and blushers.

[Prior art and its problems] Traditionally, solid powder cosmetics have been manufactured using a press method in which a binder is added and mixed to powder raw materials and then molded, or in a fluid state in which a binder is added and mixed to powder raw materials. The pouring method is used to mold the material by pouring it into a mold.

However, when producing a solid powder cosmetic having a complex shape with an uneven surface using the pressing method, it is extremely difficult to accurately represent the shape.

In addition, when producing a so-called soft cake-like solid powder cosmetic containing a large amount of oil as a binder, which has been conventionally used in the pour-filling method, the resulting solid powder cosmetic may be oily. It has disadvantages such as being soft and easily crumbling, especially at high temperatures.

Therefore, when manufacturing solid powder cosmetics with complex shapes, powder cosmetics containing a water-soluble polymer compound as a binder are kneaded with water, then filled into molds, and then air-dried or heated. Generally, solid powder cosmetics formed by this method are dried and molded using methods such as the following, but since it is difficult to dry them uniformly over the entire surface, deformations such as shrinkage and curvature may occur during the drying process. There are problems such as the shape is not consistent, the product does not come off to the puff, and the feeling of application and spread on the skin is not consistent. This tendency is particularly noticeable when drying with hot air or the like in a short period of time.

Therefore, studies have been conducted on the amount of powdered raw materials that make up solid powder cosmetics, the water content and viscosity of the water-soluble polymer compound added layer or water-mixture, and the drying time. So far, nothing has been found that can solve the above problems.

[Problems to be Solved by the Invention]The inventors of the present invention have conducted intensive research to create a solid powder cosmetic that can solve the above-mentioned problems in a short period of time. ! The present inventors have discovered a manufacturing method that allows for accurate molding of irregularly shaped molded products and that allows for the production of solid powder cosmetics that have excellent usability, and have completed the present invention.

[Means for Solving the Problems] The present invention involves filling a mold with a water-kneaded mixture of powdered cosmetics containing a water-soluble polymer compound, and assimilating and drying the mixture in a freeze dryer to obtain a molded product of any shape. The present invention relates to a method for producing a solid powder cosmetic characterized by the following.

[Example] Water-soluble polymer compounds used in the present invention include vinyl compounds such as polyvinyl alcohol and polyvinylpyrrolidone; cellulose compounds such as methyl cellulose, hydroxypropyl cellulose, and carboxymethyl cellulose; O-bean gum, tragacanth gummy compounds such as; alginic acid compounds such as sodium alginate and propylene glycol alginate; and inorganic clay substances such as bentonite and laponite. These compounds may be used alone or in combination of two or more. May be used together.

The powder raw materials used in the present invention may be those normally used as raw materials for cosmetics, such as inorganic powder raw materials such as talc, titanium oxide, mica, iron oxide, ultramarine, and titanium/mica pearl agents; red No. 202, yellow 401
Organic coloring materials such as No.

In addition to the above ingredients, commonly added ingredients include oil agents such as squalane, liquid paraffin, methylpolysiloxane, and isopropyl lanolin fatty acids; humectants such as pyrene glycol and glycerin; and methylparaben and ethylparaben. Preservatives; perfumes; surfactants such as self-emulsifying glyceryl monostearate and sorbitan sesquioleate may be added as necessary.

Next, the manufacturing method of the present invention will be explained.

A powder raw material, a water-soluble polymer compound, and water are prepared, and the thoroughly mixed mixture is filled into a mold.

After filling, the mold is placed in a freeze dryer and cooled from room temperature to 14
Rapidly cool to below 0°C. In this case, the mixture in the freeze dryer and the mold may be frozen.

Next, by vacuum drying while raising the shelf temperature of the freeze dryer, the desired solid powder cosmetic can be obtained.

The amount of the water-soluble polymer compound added is 0.0 in the mixture.
It is preferably 5 to 5.0% (weight %, the same applies hereinafter). More preferably, it is 0.1 to 2.0%. If the amount of the water-soluble polymer compound added is less than 0.05%, the resulting solid powder cosmetic will become brittle, resulting in a decrease in impact resistance, and if it exceeds 5.0%, the resulting solid powder will become brittle. Cosmetics become hard, making it difficult to remove them with a puff or the like.

Solid powder cosmetic molded product 130 that can obtain the added amount of water
The amount is preferably 10 to 250 parts (parts by weight, hereinafter the same). More preferably, it is 50 to 170 parts.

The viscosity of the mixture decreases to 20°C within 5 minutes after preparing the mixture.
When measured with a rotational viscometer in an atmosphere of Since this becomes difficult, the viscosity is adjusted by adding water to 5 to 300 P, preferably 15 to 150 P.

Next, the solid powder cosmetic of the present invention will be explained in more detail using Examples and Comparative Examples, but the present invention is not limited to these Examples.

Example 1 (Manufacture of blusher) 12.2 parts of mica, 3.1 part of kaolin, 20 parts of mica titanium
．． 8 parts and 0.3 parts of Red No. 202 are mixed uniformly to form A.
I got the ingredients.

4.0 parts of methylpolysiloxane, 1.3 parts of isopropyl lanolin fatty acid, 0.7 parts of self-emulsifying glycerin monostearate, 0.1 part of methylparaben as a preservative,
0.2 parts of fragrance, 5.0 parts of 5% tragacanth aqueous solution, 5 parts of water
2.3 parts were mixed uniformly to obtain a daily ingredient.

Next, component A was put into a mixing tank, then component B was added and mixed thoroughly, and the viscosity was measured with a rotational viscometer, and the result was 1.
A uniform slurry was obtained at 20P.

The resulting slurry was filled into a trapezoidal mold with a top diameter of 5 cm, a downward diameter of 4 cm, and a depth of 1 cm, and then freeze-dried by pre-cooling to -30'C.
The mold was transferred together with the mold into a 0F-01H (manufactured by Japan Vacuum Technology Corporation) and rapidly frozen at -40''C.

After pre-freezing for 1.5 hours, place on the freeze dryer shelf.

After vacuum drying for 12 hours while controlling the temperature at 30° C., the obtained molded article was taken out from the mold.

The characteristics of the obtained molded article, such as drying properties, ease of removal, moldability, and feeling of use, were investigated according to the following methods.

The results are shown in Table 1.

(Drying property) The weight change of molded products that are air-dried and heat-dried is measured at regular intervals, and when the rate of weight change with respect to the FR becomes almost zero, it is determined that the product is dry, and the time required to reach that point is determined. was taken as the drying time.

In the case of freeze-drying, when the shelf temperature and the temperature of the molded product became the same, it was determined that the product had been dried, and the time required up to that point was defined as the drying time.

(Easy to remove) Using a cosmetic puff, brush, or brush, rub the surface of the molded product with the same force as during normal use, and give the following evaluation (iI
The ease of removal was evaluated according to the fi standard.

(Evaluation Criteria) ◯: Appropriate amount can be taken ∆: Small amount can be taken x: Too much liJ and difficult to remove (Moldability) □ The dried molded product was observed with the naked eye and its moldability was evaluated according to the following evaluation criteria.

(Evaluation criteria) O: No deformation such as shrinkage or curvature, and the shape molded product as per △: Slightly deformed molded product ×: Severely deformed molded product.

(Feeling in use) The product was rubbed onto the face using a cosmetic puff, and the feel in use was evaluated according to the following evaluation criteria.

(Evaluation criteria) 0: Good adhesion and spread on the skin △: Slightly poor adhesion and spread on the skin ×: Poor adhesion and spread on the skin Example 2 (manufacturing of eye shadow) Mica 15.2 parts , mica titanium 26.1 parts, ultramarine 0.3
1 part, 3.3 parts of iron oxide, and 0.1 part of methylparaben as a preservative were uniformly mixed to obtain component A.

Sodium carboxymethyl cellulose % aqueous solution 10.
0 parts and 45 parts of water were uniformly mixed to obtain component B.

Next, component A was placed in a mixing tank, followed by component B and thoroughly kneaded to obtain a uniform slurry with a viscosity of 3SP as measured by a rotational viscometer.

The obtained slurry was filled into a mold in the same manner as in Example 1 to produce a molded product.

The characteristics of the obtained molded article, such as drying property, surface hardness, ease of removal, moldability, and feeling in use, were examined in the same manner as in Example 1.

The results are shown in Table 1.

Comparative Examples 1 and 2 The slurries obtained in Examples 1 and 2 were filled into molds and left to dry at room temperature (approximately 25°C). Characteristics of the molded products obtained were dryness and ease of removal. , moldability and usability were investigated in the same manner as in Example 1.

The results are shown in Table 1.

Comparative Examples 3 and 4 The mixtures obtained in Examples 1 and 2 were filled into a mold,
The properties of the molded product obtained by leaving it to dry in a constant temperature room at 37°C, such as drying properties, ease of removal, moldability, and feeling of use, were examined in the same manner as in Example 1.

The results are shown in Table 1.

[Margins below] [Effects of the invention] According to the method for producing a solid powder cosmetic molded product of the present invention, a solid powder cosmetic can be produced in a shorter time than the conventional production method, and the obtained solid powder cosmetic does not have bald spots. It has the effect of providing a product that is easy to remove, adheres to the skin, and spreads easily.

Procedure Ne 11 official book (voluntary) October 1, 1985

Claims (1)

[Claims] 1 Fill a mold with a water-kneaded mixture of powdered cosmetics containing a water-soluble polymer compound, solidify and dry with a freeze dryer,
A method for producing a solid powder cosmetic, which is characterized by forming a molded article of any shape.