JPS63190811A - Powder type cosmetic - Google Patents

Abstract

PURPOSE:To obtain a powder type cosmetic, containing water absorbing powder, having a specific particle diameter and coated with fine particles of an inorganic substance or water-insoluble activator metallic salt of a specific particle diameter and having excellent absorptivity of sweat as well as adhesive properties to the skin. CONSTITUTION:A powder type cosmetic containing (B) water absorbing powder having 1-100mum, preferably 10-50mum average particle diameter coated with (A) fine particles of an inorganic substance, e.g. titanium oxide or talc, or a water-insoluble activator metallic salt, e.g. Ca salt of an 8-30C fatty acid or acylglutamic acid, having 0.005-3mum, preferably 0.005-1mum average particle diameter. The average particle diameter of the substance (A) is 1/10,000-1/5 based on that of the substance (B) and the weight ratio of the substance (A) to 100pts.wt. solution (B) is 0.5-150pts.wt., preferably 10-80pts.wt. The water absorbing powder has 5g/g water absorptivity for pure water and metal polyacrylates, etc., are used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application: The present invention relates to a powder type cosmetic, and more particularly to a powder type cosmetic with excellent sweat absorption and adhesion to the skin.

[Conventional technology]

Powder type cosmetics have conventionally been widely used for the purpose of preventing heat rash and diaper rash in infants, drying and refreshing the skin after bathing, and for other purposes.

Conventionally, talc, which has been commonly used as a main ingredient in powder-type cosmetics, has had drawbacks such as becoming sticky after sweating due to insufficient absorbency. Therefore, in order to improve absorption, in addition to starch, modified cornstarch (Japanese Patent Application Laid-Open No. 60-54308
There was a technique for blending modified cellulose (Japanese Patent Application Laid-Open No. 53-44638).

[Problem that the invention seeks to solve]

However, these methods have problems such as stickiness9 and poor smoothness when the amount added is sufficient to obtain sufficient water absorption. In addition, highly water-absorbent polymers that can obtain sufficient water absorption with a small amount of water absorption have a significant decrease in smoothness and stickiness after water absorption, making it difficult to obtain powder-type cosmetics with an excellent feeling of use.

[Means for solving problems]

Under such circumstances, the present inventors developed a body powder;
As a result of intensive research, the average grain size is 0.005 ~
A body powder composition containing a water-absorbing powder with an average particle size of 1 to IQO μm coated with a water-insoluble activator metal salt of 3 μm has a sweat absorption ability not found in conventional products. The present invention was completed based on the discovery that the powder has both adhesion to the skin and a smooth feel, and also improves the stickiness that is a drawback of water-absorbing powders.

That is, the present invention provides a powder type cosmetic containing water-absorbing powder with an average particle size of 1 to 100 μm coated with inorganic material or water-insoluble activator metal salt fine particles with an average particle size of 0.005 to 3 μm. It provides:

Furthermore, the water-absorbing powder used in the present invention has a water-absorbing capacity of 5 g/g or more, preferably 10 g/g or more for pure water.
/g or more and 600g/g or less is used. Here, the water absorption capacity is determined as follows.

That is, approximately 1 g of the water-absorbing polymer is weighed into a glass beaker, pure water is added thereto, and the mixture is left to stand until the water-absorbing polymer becomes homogeneous.

Thereafter, the water was drained on a 150-mesh wire mesh, and the weight was measured. The water absorption capacity is calculated by dividing the increased weight by the weight of the polymer. These include, for example, polyacrylic acid metal salts, polyvinyl alcohol derivatives, acrylic acid-vinyl alcohol copolymers, acrylic acid metal salts-acrylamide copolymers, polyethylene oxide with molecules of 12,000 or more, starch-acrylic acid graft copolymers, Examples include starch-acrylonitrile graft copolymer hydrolyzate, inbutylene-maleic anhydride copolymer, grafted cellulose, saponified vinyl acetate copolymer, and grafted starch.

The particle size is preferably from 1 to 100 μm, particularly preferably from 10 to 50 μm.

Examples of inorganic substances that coat the water-absorbing powder include titanium oxide, zinc oxide, zinc white, zirconium oxide, chromium oxide, cobalt oxide, red iron oxide, alumina, black iron oxide, yellow iron oxide, barium sulfate, and oxychloride. bismuth,
Boron nitride, titanium carbide, silicic anhydride, titanium mica,
Examples include kaolin, sericite, mica, talc, etc.
Insoluble activator metal salts include: fatty acids with chain lengths C8 to Cl, dialkyl phosphates, esters of ester monoalkyl phosphates, acylglutamic acids, Ca, Mg, Zn,
^l, 8a, Fe, Ti, Zr, C
o.

Examples include Ni and Cu salts.

The average particle size of these particles is about 0.005 to 3 μm, preferably 0.005 to 1 μm, and preferably 1/10000 to 115 of the average particle size of the water-absorbing powder.

Furthermore, two or more of these may be used in combination.

When mixing the inorganic substance or water-insoluble activator metal salt and the water-absorbing powder, the ratio is 0.5 to 150 parts by weight of the inorganic substance or water-insoluble activator metal salt to 100 parts by weight of the water-absorbing powder. A range of 10 to 80 parts by weight is particularly desirable.

Further, the amount of water-absorbing powder coated with an inorganic substance or a water-insoluble activator metal salt blended into a powder type cosmetic is usually 0.01 to 50% by weight, preferably 0.01 to 50% by weight.
, 1 to 10%.

In order to produce the above-mentioned powder of the present invention, the inorganic substance or the water-insoluble activator metal salt and the absorbent powder are mixed in a dry manner using a grinder or a mixer such as a ball mill or an atomizer-1 automatic mortar. Furthermore, depending on the type of absorbent powder, wet blending is possible by selecting a solvent, but it goes without saying that the water-absorbing powder does not swell or dissolve.

The above operation may be carried out by incorporating it into the manufacturing process of the water-absorbing powder, and other components such as each family may be simultaneously mixed at the time of mixing as long as the effects of the present invention are not impaired.

In short, by intimately mixing fine particles of an inorganic substance or water-insoluble activator metal salt with water-absorbing powder, part or all of the surface of the water-absorbing powder can be covered with the inorganic substance or water-insoluble activator metal salt fine particles. It is necessary to control the surface condition of the water-absorbing powder by coating it.

In preparing the powder type cosmetics of the present invention, powders and various oils, preservatives, pigments, dyes, ultraviolet inhibitors, fragrances, etc. that are generally used in powder type cosmetics can be blended in addition to the above-mentioned powders.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Moisture Absorption Test a Approximately 2 g of each sample of talc (manufactured by Asada Seifun) with an average particle size of 5.0 μm (average particle size 10 μm 1 Shōyukajirifin) was spread uniformly in a Petri dish, and left open at 30°C and relative humidity 81 .Leave it in a 1% desiccator.
Changes in weight were measured over time, and moisture absorption was measured. The results are shown in Table 1.

As shown in Table 1, the water-absorbing powders coated with inorganic fine particles of the present invention, c, and d, have better hygroscopicity than control product a.

Table 1 Example 2 However, C is talc (1 μm) Sumikagel ~ P101
0. Lightly mixed so as not to coat the surface.

After placing the above A, B, and C in a constant temperature and humidity room at 40°C and 90% RH for 10 minutes, 10 expert panelists conducted a sensory evaluation on sweat absorption, adhesion, stickiness, and sustainability of the dry feeling. The results were scored using a 5-point system, and the average values are shown in Table 2.

Table 2 reveals that the product of the present invention is comprehensively superior to control products A and C.

Table 2 Criteria for evaluation method 5...Excellent 4...Slightly excellent 3...Average 2...Slightly inferior ■...Poor Example 3 Baby powder coal/acrylic coating ■Aihun (Hiraba raft diameter 30μm 1 manufactured by Sumitomo Chemical)] Preservative 0.1 Fragrance 0
．． 2 This baby powder had excellent sweat absorbing power, good adhesion, smooth feeling, excellent smoothness, and no stickiness.

Example 4 Body powder talc 94.8 fragrance
0.2 This body powder has excellent sweat absorption and good adhesion.
It had a good dry feel, excellent smoothness, and no stickiness.

Example 5 Colon powder talc 88.5 Zinc stearate (manufactured by Wako Pure Chemical Industries) 1.0 Fragrance 0.
5 This cologne powder has excellent sweat absorption and good adhesion.
It felt silky, had excellent smoothness, and was not sticky.

Example 6 Talc 70 mica
5.0 squalane
10.0 kaolin
3.0 Preservatives Appropriate amount Pigment Appropriate amount Perfume 0.5 The above cosmetic had excellent sweat absorption, good adhesion, smooth feeling, excellent smoothness, and no stickiness.

Claims (1)

[Scope of Claims] 1. Average particle size 1 coated with inorganic substance or water-insoluble activator metal salt fine particles having an average particle size of 0.005 to 3 μm.
A powder type cosmetic characterized by containing water-absorbing powder of ~100 μm. 2. The powder-type cosmetic according to claim 1, wherein the water-absorbing powder has a water-absorbing capacity of 5 g/g (based on pure water) or more. 3. The powder type cosmetic according to claim 1 or 2, wherein the average particle size of the inorganic substance or water-insoluble activator metal salt fine particles is 1/10000 to 1/5 of the average particle size of the water-absorbing powder. . 4. The powder mold according to any one of claims 1 to 3, wherein the ratio of the inorganic substance or water-insoluble activator metal salt particles to 100 parts by weight of the water-absorbing powder is 0.5 to 150 parts by weight. Cosmetics.