JPS6351313A - Powdery cosmetic - Google Patents

Abstract

PURPOSE:To provide a powdery cosmetic having excellent microbial stability, by compounding phenoxyethanol as a component. CONSTITUTION:A powdery cosmetic such as make-up cosmetic, body cosmetic, etc., composed mainly of powdery cosmetic component is compounded with about 0.01-2wt% phenoxyethanol. Phenoxyethanol has high safety to skin, can be easily compounded to a product and gives excellent durable antiseptic and antimildew effect at an extremely small amount.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to powder cosmetics that are stable against microbial contamination, and more specifically, to powder cosmetics that have excellent microbial stability and are characterized by containing phenoxyethanol. The present invention relates to powder cosmetics.

[Prior Art] Powder cosmetics are usually composed of components such as inorganic pigments, organic pigments, oil agents, and surfactants.

The formulation contains a growth medium for these microorganisms, and by using a water-containing coating material such as a sponge as a medium like powdered cosmetics such as color cake, microorganisms such as mold, yeast, and bacteria can be grown. As a result, microorganisms proliferate in powdered cosmetics, causing changes in appearance, odor, and deterioration.

As a result, the value of cosmetics decreases, so preservatives are generally applied to protect powdered cosmetics from raw materials 4, which are the constituent ingredients, and to protect against contamination during use. There is.

The preservatives for powdered cosmetics should be highly safe in terms of skin irritation, be stable and have a long-lasting effect when added to cosmetics, and not lose their effectiveness due to the ingredients that make up the cosmetics. It is important that they satisfy conditions such as being effective in small amounts, and they have been selected and put into practical use based on these points.

Conventionally, such preservatives and antibacterial agents are selected from among various bactericidal agents and antibacterial agents, taking into account the above conditions, 1, for example, p-oxyammonium of lower esters such as methyl, ethyl, propyl, butyl, lint-resistant alkyl esters, dehydrotoxicants, and One of these has been considered particularly useful and has been frequently used. While the number was limited, the antiseptic effect was obtained by determining the appropriate amount to be used for each powder cosmetic within the regulatory limits and by mixing and using them together.

[Problems to be Solved by the Invention] As mentioned above, para-oxybenzoic acid alkyl esters, namely methyl, ethyl,
Propyl, butyl esters, dehydroacetic acid, and their salts are widely used as the most suitable ones, but even if these are used, they cannot be used in product systems containing highly polar oils such as surfactants and ester oils. It has often been observed that the antiseptic effect is not sufficiently exerted because the ingredients are incorporated into the above-mentioned components.

Therefore, one way to improve the antiseptic effect was to increase the amount used. However, in such cases, not only is it unfavorable from a skin safety perspective, but the paraoxybenzoic acid alkyl esters are affected by the external temperature environment, and crystal precipitation is observed at low temperatures, especially in powder cosmetics. In some cases, there are problems in that the appearance is unsatisfactory and the quality is unfavorable, and care must be taken to prevent crystal precipitation from the viewpoint of solubility.

In recent years, there has also been a demand for powder cosmetics to eliminate dryness on the skin, have moisturizing effects, and treat the skin. Various efforts have been made to add ingredients and improve cosmetic effects, and as formulas have become more complex, their uses have also become more diverse. However, there is a need for antiseptic protection to cope with the current situation, and this has become an important problem, but even if conventionally used ones are used, they have the drawbacks mentioned above, making it difficult in some cases.

[Means for Solving the Problems] In view of the above circumstances, the inventors of the present invention have conducted extensive research into various bactericidal and antibacterial agents that are highly safe for the skin and have been developed to improve the antiseptic properties of powder cosmetics. They discovered that phenoxyethanol has excellent properties for powder cosmetics, such as good product stability and very good anti-corrosion and anti-magnetic effects, and completed the present invention based on the knowledge that it is useful.

That is, the present invention relates to a powder cosmetic characterized by containing phenoxyethanol.

The configuration of the present invention will be explained below.

Powder cosmetics in the present invention are those mainly composed of cosmetic powder ingredients, such as white powder, blusher, foundation, eye shadow, eyebrow powder, etc., makeup powder, talcum powder, body powder, baby powder, etc. Body cosmetics can be exemplified, and those in powder, solid, and stick forms are known. In general, these are mainly based on powder components such as colored pigments, white pigments, extender pigments, pearl agents, metal soaps, natural and synthetic organic powders, and oils, surfactants, fragrances, water-soluble polymers, and polyesters. It is considered to be composed of alcohols, ultraviolet absorbers, antioxidants, and other skin-beautifying ingredients, and is substantially water-free.

Phenoxyethanol, which is essentially used in the present invention, is a slightly viscous liquid at room temperature, and its chemical name is 2-phenoxyethanol.

The use of phenoxyethanol as a bactericidal/antibacterial agent or as a perfume diluent is partially known. In particular, in the field of cosmetics, there have been reports of applications of sterilizing and antibacterial effects to type 07 creams, type W10 creams, shampoos, conditioners, etc.

However, the bactericidal and antibacterial activity of phenoxyethanol is effective against microorganisms such as Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, and yeast, and it has been thought that its efficacy as an antifungal agent cannot be expected to be very high. In addition, phenoxyethanol is easily soluble in aqueous components and has only been investigated for use in water-containing products, and there are no known examples of anhydrous powder cosmetics such as the present invention.

Powdered cosmetics mainly suffer from the growth of mold before bacteria, and it was discovered for the first time by the inventors of wood that it is also effective as an antifungal agent for powdered cosmetics2.
1G real.

The amount of phenoxyethanol used in the present invention depends on the product type,
It varies depending on the purpose of use and is not limited to 0.
．． The range is approximately 0.01 to 2% by weight. i.e. 0.01
If it is less than 2% by weight, no effect can be expected, and if it is more than 2% by weight, it tends to be unfavorable in terms of skin Ja safety.If the amount is within the above range, it is sufficient to achieve the purpose of the present invention.

Furthermore, if necessary, there is no problem in using it in combination with phenoxyethanol and conventionally used preservatives such as lower alkyl esters of roseoxybenzoic acid, dehydroacetic acid and its salts.

[Example] Hereinafter, the present invention will be further explained with reference to Examples.

Note that these do not limit the present invention in any way.

Example [11] In order to confirm the effect of the present invention, phenoxyethanol was added to the powder cosmetic (cake-like foundation) formulation listed in Table 1, and for comparison, methyl paraoxybenzoate,
An antiseptic test was conducted by adding ethyl, propyl, and butyl esters.

Powder cosmetics as samples were prepared according to conventional methods and subjected to testing.

In addition, the test method is to use filter paper (Toyo 7 Togami Yo 2) in a Petri colander.
), add about 10+ al of sterile purified water, and then place the powdered cosmetics sprinkled with the mold spore dispersion on top of a glass cup, making sure that the sterile purified water does not come into direct contact with the powdered cosmetics. Next, the mold was scattered in a constant temperature bath at 25° C. with the lid of the bedridian covered and the inside of the bedridden kept at high humidity, and the growth of mold was observed continuously for 28 days.

At this time, the following four types of molds were used for testing.

■ Aspergillus niger (Aspergillus niger ATCC:
9842) ■ Aspergillus terreus (Aspergillus terreus 89-
GO-148)■ Penicillum C1torinurJ89-
Go-8) ■ Aspergillus 5PP (Aspergillus 5PP) No growth was observed in any of the four molds used in the evaluation standard O2 test.

×: Growth of at least one of the four types of mold used in the test was observed.

The results are shown in Table 2.

Table 1 Table 2 As is clear from the results in Table 2, in Example [1], no growth or propagation of the mold used was observed, and it had excellent stability against mold. Further, no abnormality was observed from the results of actually using the color cake of Example [1]. That is, it was confirmed from this that phenoxyethanol is extremely effective as a preservative and imitation agent for powder makeup t1.

Example [21 Wet and dry foundation (ingredients)
(Weight%) (1) Titanium oxide 15.0 (2) Mica titanium
3.0 (3) Talc
10.0(4) Mica
54.25(5) Colored pigments
3.5 (6) Stawaran
2.0 (7) Liquid paraffin 3.
0(8) Vaseline 1.
0(9) Glycerin fatty acid ester 2.0(
10) Silicone oil 6.0 (11)
Fragrance 0.2 (12)
Phenoxyethanol 0.05 (Production method) A Components (1) to (5) are stirred and mixed in a blender.

B: Mix components (6) to (12) and heat and dissolve.

After adding and mixing B to CA, it is crushed to make it homogeneous, and then press-filled to form a product.

Example [31 Eyeshadow (ingredients) (wt%) (1)
Mica titanium 57.5 (2) Mica 22.0 (3) Colored pigment
1.3(4) Glycerin fatty acid ester 3.0(5) Vaseline
4.0 (6) Star Run
8.5 (7) Silicone oil
3.0(8) Fragrance
0.2(9) Phenoxyethanol
0.5 (Production method) A Components (1) to (3) are stirred and mixed in a blender.

B: Mix components (4) to (9) and heat to dissolve.

After adding and mixing B to CA, it is crushed to make it homogeneous, and then press-filled to make a product.

Example [41 Body powder (ingredients) (wt%) (1)
Talc 85.0 (2
) Nylon powder 1.0 (3) Mica 1O04 (4) Charcoal calcium resistant 1.0 (5) Silicone oil
1.5 (6) Fragrance
T.

(7) Phenoxyethanol 0.1 (
Manufacturing method) A Components (1) to (4) are stirred and mixed in a blender.

B: Mix components (5) to (7).

After adding and mixing B to CA, it is crushed to make it homogeneous to obtain a product.

The products of Examples [2] to 1 obtained as described above were tested in the corrosion resistance test and in actual use. Even with X, no abnormalities such as bacterial growth were observed, and the microbial stability was excellent.

[Effects of the Invention] As described above, the present invention is characterized in that the antiseptic and antimagnetic effect of powder cosmetics can be further improved by blending phenoxyethanol into powder cosmetics.

According to the present invention, phenoxyethanol is highly safe for the skin, can be easily incorporated into product systems, and has excellent antiseptic properties for powder cosmetics even in small amounts, improving long-lasting antiseptic effects. It is a great advantage to know that the present invention is very convenient for obtaining powdered cosmetics, and is particularly effective for powdered cosmetics, which are difficult to obtain with conventional preservatives.

Thus, according to the present invention, it has become possible to provide a powder cosmetic with excellent microbial stability and in which the effect of blending lephenoxyethanol against microbial contamination is effectively exhibited.

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Claims (1)

[Claims] (1) A powder cosmetic characterized by containing phenoxyethanol.