JPH1171236A - Transparent solid powder cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic such as foundation or breast powder by including an elastic power material and an oiling agent so that the elastic powder material absorbs the oily agent to solidify the composition. SOLUTION: This cosmetic contains (A) 60-99 wt.% of an elastic powder material [preferably the aggregates of primary particles having an average primary particle diameter of e.g. 0.01-1000 μm measured by their observation using an electronic microscope, e.g. a synthetic elastomer such as a silicone elastomer, an acrylic rubber or a polyurethane rubber, or a natural elastomer), (B) 1-40 wt.% of an oiling agent (preferably a semi-solid, liquid oiling agent usually used for cosmetics, e.g. a hydrocarbon such as petrolatum, a fatty acid such as stearic acid, or a higher alcohol such as glycerol tri caprylate) and, if necessary, an extender for preventing the generation of cracks after solidified, a metal salt, an inorganic or organic powder material, a UV light absorbent, a preservative, a moisturizing agent and/or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent solid powder cosmetic which is transparent in appearance, has an excellent aesthetic sensation, and provides a natural cosmetic effect even when applied to the skin.

[0002]

2. Description of the Related Art In recent years, many cosmetics which are transparent in appearance have been developed for the purpose of promoting the natural beauty of the bare skin in the tide of natural taste. For example, lotions, pomades, hair sticks, lipsticks and many more. However, these transparent cosmetics are limited to those containing a large amount of water or oil, and it has been extremely difficult to make solid powder cosmetics not containing a large amount of water and oil transparent.

[0003]

In such a situation, it is an object of the present invention to provide a novel solid powder cosmetic which is transparent in appearance and has a natural cosmetic effect even when applied to the skin. .

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a cosmetic powder having a transparent appearance containing an elastic powder and an oil agent can be obtained. Was completed. That is, the present inventors have found that the transparent solid powder cosmetic of the present invention can be obtained by mixing the elastic powder and the oil agent so that the elastic powder absorbs oil and solidify this sample.

[0005]

Embodiments of the present invention will be described below in detail.

The elastic powder used in the present invention has an average primary particle diameter of, for example, 0.0
It is a resin powder having rubber elasticity which is an aggregate of primary particles of 1 to 1000 μm, and is a silicone elastomer, fluorosilicone elastomer, modified silicone elastomer, acrylic rubber, polyurethane rubber, polyethylene rubber, polyolefin rubber, polyester rubber. And natural rubber elastomers. Among these, silicone elastomers (Trefle E series manufactured by Dow Corning Toray Silicone Co., Ltd.) are useful as cosmetics (for example,
This is preferable from the viewpoint of feel and the like. The amount of the silicone elastomer varies depending on the dosage form used, but is generally preferably 60 to 99% by weight (hereinafter abbreviated as wt%).

Also, an elastic powder obtained by treating the surface of an elastic powder with a conventionally known compound such as trimethylsiloxysilicic acid, a silane coupling agent, a metal soap, N-acylated lysine, a perfluoroalkyl phosphate, a mechanochemical treatment, An elastic powder that has been subjected to a treatment such as a plasma treatment is also applied to the present invention. When used, it may be used as it is, but it is more preferable to use a bead mill, crusher or the like to break up the aggregation and use it.

[0008] As the oil agent used in the present invention, a semisolid or liquid oil agent usually used for cosmetics can be used.
For example, hydrocarbons such as petrolatum and liquid paraffin; fatty acids such as stearic acid and oleic acid; triglycerides such as glyceryl tricaprate and glyceryl tristearate; higher alcohols such as cetanol; esters such as isopropyl myristate; Lanolin derivatives;
Examples include silicone compounds such as methylpolysiloxane and phenylmethylpolysiloxane. In addition, solid oils such as waxes generally used in cosmetics melt,
It can be used by mixing it with other liquid oils to form a liquid state. In the present invention, one or more of these oily components can be used in combination. Also,
The blending amount of the oil agent is not particularly limited, but is generally preferably 1 to 40 wt% in consideration of the usability as a powder cosmetic.

The "transparent" cosmetic composition referred to in the present invention means that a sheet of paper having black characters of 26 points is placed on the bottom of a gold plate, and the sample is placed on the gold plate with a thickness of 4.5 to 4.5. 5.0m
m so that the characters on the bottom can be visually recognized.

An extender pigment, a metal salt, an inorganic powder, an organic powder other than an elastomer or the like is blended to the extent that the object of the present invention is not hindered for the purpose of preventing usability after solidification and improving usability such as uniform removal during use. It is also possible.

For example, pigments such as Red No. 104, Red No. 226, Yellow No. 4, Blue No. 1, Blue No. 404 and the like, Yellow No. 4 A
lake, yellow 203 Ba lake, etc., silicone powder other than elastomer which is an essential component of the present invention, polymers such as urethane powder, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, carbon black, Ultramarine, navy blue and other colored pigments, zinc oxide, titanium oxide, cerium oxide and other white pigments, talc, mica, sericite, kaolin and other constitutional pigments, mica titanium and other pearl pigments, barium sulfate, calcium carbonate, magnesium carbonate, Examples thereof include metal salts such as aluminum silicate and magnesium silicate, inorganic powders such as silica and alumina, fine particle titanium oxide, fine particle zinc oxide, fine particle iron oxide, alumina-treated fine particle titanium oxide, silica-treated fine particle titanium oxide, bentonite, smectite and the like. The shapes of these dyes and pigments are not particularly limited. Moreover, the compounding quantity is 0.001-0.
1 wt% is desirable.

Further, in addition to the above-mentioned components, if necessary, components usually added to cosmetics may be added to such an extent that the effects of the present invention are not impaired. For example, ultraviolet absorbers, preservatives, fragrances, antioxidants, humectants and the like can be mentioned.

In order to obtain the transparent solid powder cosmetic of the present invention, no special production equipment is required, and the production method used conventionally for producing foundations and pressed powders may be used.

As an example of the transparent solid powder cosmetic composition of the present invention, the dosage form is not particularly limited as long as the powder is solidified. For example, foundation, pressed powder, teak color, eyeshadow, and the like can be mentioned as those that are filled into a container and solidified. Examples of solidified powders include powder sticks.

[0015]

Next, the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0016] Pressed powders were prepared according to the formulations shown in Table 1 for the examples and Table 2 for the comparative examples. Note that the silicone elastomer (Trefil E-505C) was used as the elastic powder in the examples. Further, in Comparative Examples, polymethylsilsesquioxane which is an inelastic powder (Tospearl 145A manufactured by Toshiba Silicone Co., Ltd., average primary particle size 4.5 μm)
m) was used.

In the method for producing the samples of Examples and Comparative Examples, after the powder components were uniformly mixed, the oil component was added, and the mixture was further mixed until a uniform state was obtained. The obtained mixed powder is stamped into a metal plate (thickness: 4.5 mm, stamping pressure: 1 to 3 kg / cm ² ).
And used as a sample.

(1) Method of Evaluating Transparency The sample was visually observed, and the characters on the bottom of the gold plate were recognized: “」 ”The characters on the bottom of the gold plate were not recognized:“ × ” went.

[0019]

[Table 1]

[0020]

[Table 2]

The evaluation results of the transparency are shown in Tables 1 and 2.

From Table 1, it was found that all of the pressed powders of Examples 1 to 7 of the present invention containing a silicone elastomer had good transparency. In contrast, the pressed powders containing polymethylsilsesquioxane of Comparative Examples 1 to 7 in Table 2 all had poor transparency. In addition, as a result of performing a practical test on 10 panelists, Examples 1 to 7 were evaluated to be more transparent at the time of application and to have a natural cosmetic effect than Comparative Examples 1 to 7.

[0023]

From the above, it is apparent that the present invention provides a transparent solid powder cosmetic which is transparent in appearance and can provide a natural cosmetic effect even when applied to the skin.

Claims (1)

[Claims] 1. A transparent solid powder cosmetic comprising an elastic powder and an oil agent.