JPH053450B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Field of Application> The present invention relates to a method for producing a powdered solid cosmetic in which powder is solidified using a binder. <Prior Art> Typical conventional make-up cosmetics are generally known to be those prepared by mixing commonly used powders such as various pigments with oils and fats, waxes, etc. and molding the mixture. However, this type of makeup cosmetics has drawbacks such as an oily feel, stickiness, and makeup smearing, and is not necessarily satisfactory in terms of feeling of use, adhesion, etc. Furthermore, when using oils and waxes for press molds, a pressing process or a time-consuming process of processing in a heated molten state and cooling is required. The method of solidifying powders such as various pigments using gypsum as a binder has a short pot life and is difficult to manufacture because the gypsum hardens rapidly. It has the disadvantage of being uncomfortable to the touch when used. In the method of solidifying powder using a water-soluble binder such as CMC (sodium carboxymethyl cellulose) or HPC (hydroxypropyl cellulose), the binder migrates to the surface of the solid object during the drying process of the product, forming a film on the surface. Because of this, it is difficult to dry the inside of the solid product, so it takes a long time to dry, and the dried product has the disadvantage that it has a poor texture unless the surface is scraped off. In addition, the method of solidifying powders using binders that dissolve in non-aqueous solvents, such as methylcellulose, rosin, silica, wax, polyvinyl acetate, acrylic polymers, etc., is the same as when using water-soluble binders. There are drawbacks. <Problems to be Solved by the Invention> Therefore, the present invention has been developed to eliminate the disadvantages of oily feel, stickiness, makeup smearing, etc. found in conventional makeup cosmetics containing oils, fats, waxes, etc. as main ingredients, and to use powder-solid products. It is possible to obtain a product with a good balance of strength, feel, adhesion, etc. as a cosmetic, and furthermore, since there is no problem of the binder migrating to the surface, the drying process during production can be shortened.
The object of this invention is to provide a method for producing a solid powder cosmetic that does not require the operation of scraping off the surface film during use. <Means for Solving the Problems> That is, the method for producing a powder solid cosmetic according to the present invention is characterized in that water-repellent powder and organic bentonite are mixed with an organic solvent, then molded and dried. It is something to do. <Specific Description of the Invention> The water-repellent powder used in this invention includes extender pigments, white pigments, colored pigments, pearl pigments, starches, nylon powders, etc. that have been conventionally used in make-up cosmetics. For example, it is treated with methylhydrodiene polysiloxane), treated with metal soap, or treated with an amino acid (eg, acyl glutamate) to impart water repellency. It has been known for a long time that the use of these water-repellent powders improves the feel, adhesion, spreadability, and adhesion of cosmetics, but this invention also uses untreated powders. In comparison, strength, feel, adhesion, etc. are improved, increasing the product value of solid powder cosmetics. The organic bentonite used in this invention is made by treating bentonite, a natural clay mineral with a negatively charged surface, with a quaternary ammonium salt or the like to adsorb organic cations on the surface and modify it. It has traditionally been added to nail enamel as an anti-settling agent to prevent pigments and pearl materials from settling in organic solvents. However, the organic bentonite in this invention plays a role as a binder for powders. That is, organic bentonite swells without being dissolved in a solvent, forms a network structure, adsorbs powder, and maintains a certain shape after the solvent is removed. Therefore, by using organic bentonite as a binder for powdered solid cosmetics, it is possible to maintain the product's good touch and feel while maintaining the strength, hardness, breakage resistance, etc. required for solid cosmetics. Even if inorganic bentonite or a hydrophilic binder is used, these effects cannot be sufficiently obtained. Furthermore, the phenomenon of surface film formation caused by the binder during the drying process, which occurs when a binder soluble in a non-aqueous solvent is used, can also be eliminated by using organic bentonite. Furthermore, when a binder that dissolves in a non-aqueous solvent is used together with a water-repellent powder, the binder flows out together with the non-aqueous solvent during solidification, making it difficult for the inside of the powder to stick. In the present invention, in which organic bentonite is used as a binder, the above-mentioned problems are eliminated because the organic bentonite and the water-repellent powder have good miscibility. Organic bentonite can be obtained as a commercial product, for example, the product name "Bentone" manufactured by National Lead Co., Ltd. (USA), the product name "ESBEN" manufactured by Toyojun Yoko Co., Ltd., or Shiraishi Kogyo Co., Ltd. ) manufactured by the company under the trade name "Oluben" can be preferably used. These are CTFA (The Cosmetic, Toiletry and
Stearalkonium Hectorite ("Bentone 27") by Cosmetic Ingredient Dictionary of Fragrance Association, Inc.
Quaternium-18 Bentonite (“Benton 34”),
Quaternium-18 Hectorite (“Benton 38”)
This corresponds to The blending amount of organic bentonite is generally in the range of 0.01 to 40% by weight based on the powder used, and it improves the touch, feel, adhesion, and From a comprehensive viewpoint of functionality such as durability and strength, the preferred range is about 0.1 to 15% by weight. If it is less than 0.01% by weight, it will be difficult to mold the product into a certain shape, and even if it can be molded, it will not have sufficient strength. On the other hand, if the amount exceeds 40% by weight, there will be problems in terms of the feel and touch of the product. Note that it is also an effective method to use solvent-insoluble microcrystalline cellulose, metal soap, etc. in combination, since they have an auxiliary effect on organic bentonite, that is, they increase strength and help maintain shape. The organic solvent used in this invention sufficiently swells the organic bentonite and exhibits its binder effect well, and at the same time has a boiling point of 40 to 40% at normal pressure.
Preferably, the temperature is in the range of 240°C. For example, n
- Hydrocarbons such as hexane, n-heptane, low-boiling isoparaffin, toluene and xylene, alcohols such as ethanol and isopropanol, isopropyl ether, tetrahydrofuran, ethers and acetals such as diethylacetals, ketones such as acetone, acetic acid Esters such as ethyl and ethyl lactate, polyhydric alcohols and their derivatives such as ethylene coglycol monoethyl ether, propylene glycol, and ethylene glycol monoethyl ether acetate, volatile silicones such as cyclic dimethylpolysiloxane, linear dimethylpolysiloxane, etc. There are various types. The above organic solvents can be used alone or in combination. The amount of this organic solvent used is preferably in the range of about 0.3 to 6 times (weight ratio) the total amount of powder and organic bentonite; if it is less than 0.3 times, solidification will be difficult, and if it is more than 6 times, solidification will be difficult. Even if solidification is possible, it takes time to dry and there is a large loss of solvent. In addition to the essential components of the powder, organic bentonite, and organic solvent described above, a small amount of a polar substance such as propylene carbonate or an acid may be added in order to further exhibit the binder effect of the organic bentonite. Furthermore, in order to prevent the product from deteriorating over time,
Conventionally used preservatives, antioxidants, ultraviolet absorbers, etc. may be added and mixed as necessary. <Examples> The present invention will be further explained below with reference to Examples. In addition, all "parts" in the examples indicate parts by weight. Example 1: Eye shadow Amino acid treated mica titanium pearl 59.75 parts Amino acid treated inorganic pigment 40 parts Microcrystalline cellulose 0.1 part Esben 0.1 part Propylene carbonate 0.05 part Fragrance Appropriate amount Acetone 400 parts Example 2: Blush Amino acid treated mica 22 parts Amino acid treated mica titanium 22 parts Amino acid-treated talc 34 parts Silicone-treated inorganic pigment 8 parts Silicone-treated colored pigment 2.7 parts Zinc stearate 10 parts Bentone 38 1.3 parts Fragrance appropriate amount Preservative appropriate amount Butyl acetate 500 parts Example 3: Foundation Metal soap treated talc 50 Parts Metal soap-treated sericite 10 parts Metal soap-treated mica 20 parts Amino acid-treated titanium oxide 6 parts Amino acid-treated red iron 2.3 parts Zinc stearate 10 parts Bentone 27 1.7 parts Isopropanol 450 parts Each of the products of Examples 1 to 3 above It was also produced as follows: After thoroughly mixing the powders and organic bentonite, appropriate amounts of fragrances, preservatives, etc. were added, and then a solvent was added and mixed until uniform. This mixture containing the solvent was molded into 8mm pieces using a pressure molding machine.
After molding into a rod shape of φ, the product was dried at 40 to 80°C to remove the solvent, and a stick-shaped product was obtained. Table 1 summarizes the results of a breakage test, a disintegration test, and a sensory test performed on the powdered solid cosmetics obtained in the above examples.

[Table] <Effects of the Invention> As can be seen from the above explanation, according to the present invention, by blending powder, organic bentonite, and a solvent as essential components, the organic bentonite is swollen by the solvent. forms a network structure, exhibits the resulting binder function and adsorbs powders,
Because it can maintain a certain shape after the solvent evaporates, it has the strength, hardness, and
It has breakage resistance, and at the same time has good usability, adhesion,
It is possible to obtain a product that has well-balanced makeup durability and the like. In addition, it is possible to eliminate problems such as the formation of a surface film by the binder during the drying process, which occurs when a binder that dissolves in a solvent is used, and the water-repellent powder and the binder are not miscible.

Claims (1)

[Scope of Claims] 1. A method for producing a powdered solid cosmetic, which comprises mixing water-repellent powder and organic bentonite with an organic solvent, then molding and drying to remove the organic solvent. 2 Organic bentonite is 0.01 to 40% by weight of the powder
2. The method according to claim 1, wherein the organic solvent is mixed in an amount of 0.3 to 6 times (weight ratio) the total amount of the powder and organic bentonite. 3 As an organic solvent, the boiling point is 40℃ or higher and 240℃ at normal pressure.
Claim 1 uses hydrocarbons, alcohols, ethers and acetals, ketones, esters, polyhydric alcohols and their derivatives, and volatile silicones, either singly or in combination, in the following ranges: Method described.