JPH045643B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a novel cosmetic that has excellent water resistance and sweat resistance, has a sebum control effect, and has good makeup retention. BACKGROUND ART In general, good makeup retention is an important element for cosmetics, and various studies have been conducted to improve the makeup retention of cosmetics. In the course of such research, attempts have recently been made to make powders hydrophobic, such as by treating them with silicone to make them water-repellent, thereby improving the longevity of cosmetics. . However, the current situation is that conventional methods for improving makeup retention, including this method, are still not fully satisfactory. Furthermore, conventionally, the so-called T-zone region from the forehead to the nose secretes a lot of sebum, and this has been a common problem for people with oily skin, as oil builds up in this region and makeup often comes off. Solve this problem,
Currently, lower alcohols, skin astringents, or other drugs are added to suppress excessive sebum secretion and make makeup last longer, but these methods have little effect and make makeup last longer. I was not satisfied with the mochi. Problems to be Solved by the Invention In view of the circumstances of the prior art described above, the present inventors have
From a completely new perspective, we focused on the composition of sebum present on the skin (see Table 1).

[Table] Dowing DT Strauss JJ (Dowing DT
Strauss.JJ): "Synthesis and composition of human skin surface lipids"
(Synthesis and composition of surface lipids
of human skin.）J.lnvest Dermatol. 62228−244
(1974) In other words, free fatty acids contained in sebum (the content varies between individuals, but generally 7.9-39%)
After searching for various substances that can suppress sebum secretion by reacting with fatty acids, we found that a specific mixture of zinc white and zinc carbonate instantly reacts with the fatty acids and turns sebum into a gel, thereby suppressing sebum secretion. The present inventors have discovered that it is possible to improve the water resistance and sweat resistance, improve the sebum control effect, and significantly improve the longevity of cosmetics, leading to the completion of the present invention. Means for Solving the Problems That is, the present invention has a specific surface area of 15 m ² /g to 100
m ² /g of zinc white and zinc carbonate 90:10-99.9:
The present invention provides a cosmetic composition containing 0.1 to 50% by weight of a mixture of 0.1 to 50% by weight. The zinc white and zinc carbonate used in the present invention must have a specific surface area of 15 to 100 m ² /g. If the specific surface area is less than 15 m ² /g, the effect of improving makeup retention will be diminished, and if it exceeds 100 m ² /g, it will become powdery, poor usability, and reduce commercial value, which is not preferable. The preferred specific surface area is
It is 20 to 90 m ² /g. On the other hand, the blending amount needs to be 0.1 to 50% by weight in the total cosmetic. If the amount is less than 0.1% by weight, the improvement in makeup retention may be slightly diminished, while if it exceeds 50% by weight, the resulting cosmetic may become powdery and have poor usability. The mixing ratio of zinc white and zinc carbonate is
Must be within the range of 90:10 to 99.9:0.1. The zinc white and zinc carbonate having the above-mentioned specific specific surface area that are blended into the cosmetic according to the present invention have a specific surface area of 20 to 90 m ² /
It has a larger specific surface area than that of g.
Zinc white having such a specific surface area can be produced by reacting a zinc sulfate solution and a soda ash solution, washing the reaction product with water, filtering it, drying it, calcining it, and pulverizing it to obtain the desired particle size. It is also commercially available as a rubber vulcanization accelerator (for example, as zinc white, activated lead flower Azo manufactured by Seido Chemical Co., Ltd. and Zinka 20 manufactured by Sakai Chemical Co., Ltd. are used, and as zinc carbonate, Zinc Carbonate manufactured by Seido Chemical Co., Ltd. , transparent zinc white manufactured by Sakai Chemicals, etc. can be used). Other general-purpose ingredients that can be blended into the cosmetics according to the present invention include:
Other powders such as clay minerals such as mica, talc and kaolin, titanium oxide, iron oxide pigments, organic pigments, resin powders; various vegetable oils, animal oils, mineral oils and synthetic oils (e.g. olive oil) commonly used in cosmetics; , lanolin, liquid paraffin, squalane, silicone oil, various ester oils); humectants such as ethylene glycol, glycerin, 1,3-butylene glycol, maltitol; surfactants; fragrances; preservatives; antioxidants etc. can be blended. Table 2 below shows the results of an in vitro test to show the effect of improving makeup durability by gelling sebum when specific zinc white and zinc carbonate are blended according to the present invention.

[Table] In addition, according to the present invention, the surface activity of the pigment is
55 [12] 864-871 (1982), it can be measured from the decomposition of isopropanol (IPA). According to this document, those that decompose IPA to produce acetone have basic activity, and those that produce propylene have acidic activity. Table 3 shows a comparison between the basicity of the mixture of lead white and zinc carbonate blended into the cosmetic according to the present invention and the basicity of zinc white. The mixture of zinc white A and zinc carbonate Z according to the present invention has a higher acetone production rate than general zinc white C and D, has strong base activity, has a strong sebum gelling ability, and is therefore suitable for cosmetics. It shows that it has good stickiness.
This is clear from the results of 3.

[Table] *: See Table-2 The measurement was carried out using Honma Riken's microcontact reaction device. Examples Examples of the present invention are shown below, but it goes without saying that the scope of the present invention is not limited to these examples. In addition, in the following examples, the compounding amount is weight %. Example 1 and Comparative Example 1 (solid blusher)

[Table] (Production method) Stir and mix the powder parts of ingredients (1) to (7) in a blender, and then blow the dissolved ingredients (8) and (9) and the fragrance of ingredient (10) onto the powder part. The mixture was soaked and further stirred. The obtained product was crushed and molded into a product. The obtained solid blusher did not cause makeup smearing, oil buildup, or color dullness, and was excellent in water resistance and sweat resistance, and had good makeup retention, but the product of Comparative Example 1 had poor makeup retention and was not suitable for practical use. I couldn't offer it to anyone. Example 2 and Comparative Example 2 (sebum control lotion)

[Table] (Production method) Example 2: Add ingredients (2) and (3) to ingredient (1), and then add ingredients (4) to (6), and then mix with a homomixer to make sebum control makeup. produced water. Comparative Example 2: Components (3) and (6) were added to component (1) and mixed and stirred to produce a sebum control lotion. Furthermore, the sebum control effect was evaluated by expert panel 12.
After applying the product of the present invention and the comparative product, the foundation was applied, and 3 hours later, the sebum control effect was evaluated, and the makeup retention was evaluated according to the following criteria. 〇: Makeup is not ruined. ×: Makeup is ruined. Example 2 is a system containing 9.9% zinc white A and 0.1% zinc carbonate Z according to the present invention, but the sebum control effect ( The makeup lasted well. On the other hand, the system of Comparative Example 2 in which an astringent was added had a poor sebum control effect (makeup retention);
It could not be put to practical use.

[Brief explanation of drawings]

FIG. 1 is an infrared absorption spectrum diagram of sebum without applying zinc white A according to the present invention;
The figure is an infrared absorption spectrum diagram of sebum when zinc white A according to the present invention is applied.

Claims (1)

[Claims] 1 Mixture of zinc white and zinc carbonate in a ratio of 90:10 to 99.9:0.1 with a specific surface area of 15 m ² /g to 100 m ² /g 0.1 to 50
% by weight.