JPH09208401A - Modified powder and powdery cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain modified powders useful for a powdery cosmetic, excellent in touch of use and persistence of makeup effects and capable of manifesting antimicrobial properties by coating the surface of powders having antimicrobial activities with a specific compound. SOLUTION: This modified powder is obtained by carrying out the uniform coating treatment of the surface of powders having antimicrobial activities and 0.001-0.1μm average particle diameter (e.g. silver or aluminum) with an acylated amino acid (e.g. N-lauroyl-L-lysine) so as to provide 0.5-20wt.% coating amount. Thereby, the surface of the powder is water repellent, has antimicrobial properties and is used for, e.g. foundation powders or face powders.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a modified powder obtained by uniformly coating the surface of a powder having antibacterial activity with an acylated amino acid, the surface being water-repellent and antibacterial, and the The present invention relates to a powder cosmetic containing a modified powder. Furthermore, a modified powder that has an excellent feeling of use, is water repellent and exhibits antibacterial properties, and a powdered cosmetic that contains the modified powder and has an excellent feeling of use and a long-lasting cosmetic effect, and that exhibits antibacterial properties. Regarding fees.

[0002]

2. Description of the Related Art In recent years,
Various antibacterial products have been developed, and interest in cleanliness is increasing. It is considered that the background to this is the deterioration of the external environment due to changes in lifestyle. In other words, it can be said that the environment has become easier for bacteria to propagate as compared to before, as represented by the problem of mold contamination of air conditioner filters.
Therefore, also in cosmetics, external bacterial contamination has become a more important issue than before.

Methylparaben is added to ordinary powder cosmetics for the purpose of enhancing storage stability, that is, for preventing the growth of bacteria that are accidentally mixed in and for imparting antibacterial properties to cosmetic application sites. , Ethyl paraben and other organic preservatives are added. Further, in powder cosmetics, zinc oxide and the like may be blended together with other inorganic powder raw materials as an extender pigment, but powder cosmetics utilizing the antibacterial activity of zinc oxide etc. have been commercialized until now. Was not done.

That is, the surface of these organic preservatives and inorganic powder raw materials is hydrophilic, and when applied to the skin, the organic preservatives and the like easily flow off due to water or sweat, causing makeup to deteriorate over time. As a result, the antibacterial property of the application site of the powder cosmetic is lost. Therefore, in order to maintain the cosmetic effect for a long period of time, it is required to develop a powder raw material and a powder cosmetic which have a water-repellent surface on the powder surface, have a long-lasting cosmetic effect, and have sufficient antibacterial properties. Was there.

[0005]

[Means for Solving the Problems] In view of the above points, as a result of diligent studies, as a result, the average particle size having an antibacterial activity is 0.001
A powder surface of 0.1 μm is obtained by uniformly coating with an acylated amino acid, the coating amount is 0.5 to 20% by weight, and the surface is water-repellent and antibacterial. powder,
And, the above object can be achieved by a powder cosmetic having antibacterial properties containing the modified powder. That is, it was found that by doing so, a modified powder having excellent water repellency, feel in use, and antibacterial property can be obtained. Furthermore, they have found that the powder cosmetics containing the above-mentioned modified powders have excellent feeling in use, durability of cosmetic effect, and antibacterial property. The water repellency and antibacterial property referred to in the present invention refer to, for example, the standard performance defined by the evaluation test method described below.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The powder having an antibacterial activity and an average particle size of 0.001 to 0.1 μm used in the present invention is not particularly limited as long as it is an inorganic powder having an antibacterial activity or an inorganic-organic composite. No, for example, metal powder such as zinc, aluminum, silver, copper, cobalt, bismuth, or their oxides,
Alternatively, there may be mentioned an inorganic powder composed of chloride or both of them. Further, there are inorganic powders obtained by incorporating the above metal ions into zeolite, hydroxyapatite, zirconium phosphate, silica, alumina, and aluminum polyphosphate as a carrier. Further, a powder obtained by dispersing the powder in a polymer substance such as a silicone resin, an acrylic resin, a polyurethane resin, a nylon resin, and recycled fibroin can also be used. Then, one kind or two or more kinds selected from these powders can be used in the present invention. The above powders having an average particle size of less than 0.001 μm are difficult to industrially produce and have an average particle size of 0.1.
If the average particle size of the powder exceeds 0.00 μm, the resulting modified powder and powder cosmetics have poor antibacterial properties.
It should be 0.1 μm. Among the above powders, fine particle zinc oxide having an average particle size of 0.001 to 0.1 μm and a substantially spherical shape is particularly excellent in the color tone of the modified powder obtained by the coating treatment, and has antibacterial properties. In particular, it is preferable because the powder cosmetics containing the modified powder have excellent antibacterial properties and freedom of coloring.

Further, for the purpose of improving the optical properties and sensory properties of the modified powder of the present invention, powder having these antibacterial activity is usually added to powders such as oxides. White pigments such as titanium, cerium oxide and boron nitride, colored pigments such as yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, carbon black, ultramarine blue and dark blue, and extender pigments such as talc, sericite, mica and kaolin. , Pearl pigments such as titanium mica, bismuth oxychloride, metal salts such as barium sulfate, calcium carbonate, magnesium carbonate, magnesium silicate, magnesium sulfate, nylon powder, silk powder, urethane powder, Teflon powder, silicone powder, cellulose powder, etc. Polymeric substances, red 104, red 201, yellow 4, blue 1, black 401 and other dyes, One such lake dye such as color No. 203 Ba lake, or can be used together of two or more.

Examples of the acylated amino acid used in the present invention include N-lauroyl-L-lysine, N-lauroyl-D-lysine, N-palmitoyl-L-lysine, N
Examples include acylated amino acids having a long-chain aliphatic acyl group, such as lysine derivatives such as stearoyl-L-lysine, serine derivatives such as N-palmitoyl-L-serine and N-stearoyl-L-serine. Then, one kind or two or more kinds selected from these acylated amino acids can be used in the present invention. Among them, in particular, the feeling of use of the modified powder obtained, water repellency, antibacterial property, raw material cost, the feeling of use of powder cosmetics containing the modified powder, the durability of the cosmetic effect, and the antibacterial property. Therefore, N-lauroyl-L-lysine is particularly preferable.

The coating amount of the acylated amino acid of the present invention varies depending on the type, size and shape of the powder having antibacterial activity and the type of the acylated amino acid, but is 0.5 with respect to the modified powder. Is about 20% by weight. If it is less than 0.5% by weight, the modified powder has insufficient water repellency, and the cosmetic effect of the powder cosmetic when the modified powder is blended is inferior, and the antibacterial property of the application site is also lost. Be seen. Further, if it exceeds 20% by weight, the antibacterial property of the modified powder becomes insufficient. Within the above coating amount range, the high antibacterial activity of the powder itself and the bacteriostatic activity and water repellency of the acylated amino acid itself are balanced, and the repellency of the modified powder obtained by the coating treatment is improved. It has excellent water resistance and antibacterial properties, and when the modified powder is blended in a powder cosmetic, the water repellency of the modified powder provides excellent durability of the cosmetic effect after application of the powder cosmetic. Excellent feel and antibacterial properties are obtained. Further, among the above coating amounts, particularly preferably 1 to 10% by weight can remarkably exhibit the effects of the present invention.

In the present invention, various methods can be used for coating the surface of the powder having antibacterial activity with the acylated amino acid as long as the surface of the powder having antibacterial activity can be uniformly coated with the acylated amino acid. Any method can be used. For example, when the powder is uniformly dispersed in a suitable solvent, the acylated amino acid dissolved in a suitable solvent is added, and the powder surface is subjected to a suitable method such as pH control or temperature control. Examples thereof include a method of reprecipitating the acylated amino acid, followed by filtration, drying, and pulverization, and a method of complexing the acylated amino acid on the powder surface by a mechanochemical method.

The modified powder thus obtained has a form in which the acylated amino acid is uniformly and uniformly covered with a thin layer around the powder having antibacterial activity.

Examples of the powder cosmetics of the present invention include powder foundation, white powder, face powder,
Examples include eye shadows, pressed powders, cheek colors, liquid foundations, oil foundations, lipsticks and the like. In particular, as powder cosmetics that can significantly exhibit the effects of the present invention, powder foundation, white powder,
Face powder, eye shadow, pressed powder,
It is a cheek-colored powder or a die-cast product.

In the present invention, the ratio of the modified powder to be mixed with the powder cosmetic varies depending on the characteristics of the product, but sufficient antibacterial property is obtained, and excellent feeling in use and long-lasting effect of makeup are obtained. As a result, the total amount of powder cosmetics is 0.
It is preferable to add 1 to 95% by weight. More preferably, it is 1 to 30% by weight.

In addition to the modified powder of the present invention, the powder cosmetics of the present invention include powders, colorants, oils, humectants, surfactants, and ultraviolet rays that are commonly used in powder cosmetics. Protective agents, fragrances,
A solvent, salts, a viscous agent, a polymer substance and the like can be simultaneously added. In particular, regarding powders, conventionally known inorganic powders, organic powders, pigments, and composite powders thereof, and powders that have been subjected to surface treatment such as silicone treatment, fluorine compound treatment, metal soap treatment, and oil treatment. The kind is mentioned. Further, in some cases, the modified powder of the present invention can be further surface-treated by a conventionally known surface treatment method.

[0015]

The present invention will be described in detail below with reference to examples and comparative examples. The evaluation test methods used in the examples are shown below.

(1) Sensory property evaluation test method The powders of the examples and comparative examples were subjected to a sensory test by 10 expert panelists. The number of panelists who answered that the feeling of use (extension to skin, stickiness, etc.) was good, and judged as follows (⊚; 10-9, ∘; 8-6, Δ: 5
3 people, x; 2 to 0 people). Similarly, with respect to the powder cosmetics of Examples and Comparative Examples, evaluation tests were carried out on two items, that is, extension to the skin, feeling of use such as stickiness, and durability of cosmetic effect.

(2) Antibacterial evaluation test method The surface of the agar medium was coated with the powders of Examples and Comparative Examples (1 mg
/ Cm ² ), and the mold (Aspergillus ni)
Ger) (IAM3001) spore suspension (10 ⁴ cells / ml) (0.1 ml) was sprayed and left standing for 48 hours (30 ° C.) to observe the growth state of the bacteria. The antibacterial property was visually judged by the visual condition of the growth of the bacteria as follows (○: No mold was found in the medium, △: Mold was found in a part of the medium, ×: Mold was found all over the medium. Seen). Also,
The powder cosmetics of Examples and Comparative Examples were also subjected to the same evaluation test except that the amount applied to the agar medium was 5 mg / cm ² . The modified powder having antibacterial property referred to in the present invention is a modified powder having antibacterial property in a state where no mold is found in the culture medium by the above evaluation test method (antibacterial property which is ○ in the above judgment criteria). Defined as powder.

(3) Water repellency evaluation test method In a test tube having an inner diameter of 15 mm containing 15 ml of water, 1 g of the powder of Examples and Comparative Examples was dropped from above, and ultrasonic waves (apparatus: Yamato Scientific Bransonic 2210) were used. ) For 5 seconds, the state immediately after that was observed, and the degree of water repellency was judged by the amount of powder floating without sinking in water (○: all floating, △: part sinking) However, some are floating, ×; the whole is sunk). The modified powder having water repellency referred to in the present invention is water-repellent when it shows a state in which the entire amount of powder is floating (water repellency that is ○ in the above-mentioned criteria) by the above-mentioned evaluation test method. Defined as modified powder.

Example 1 (Production of Modified Powder of the Present Invention) Fine spherical zinc oxide particles (average particle diameter 0.02 μm)
95 g was dispersed in a mixed solution of 6.9 g of 6N hydrochloric acid and 650 g of purified water for 15 minutes by stirring with stirring using ultrasonic waves. In addition to this, N-lauroyl-L-lysine (hereinafter LL
Abbreviated as 5 g) of 5N sodium hydroxide aqueous solution 8.7
What was melt | dissolved in the mixed solution of g and the purified water 65g was added slowly over 20 minutes, and it reprecipitated on the mixed powder surface. Next, while confirming the pH of the solution with a pH meter, neutralization was completed using 1N hydrochloric acid or a 1N sodium hydroxide aqueous solution, followed by stirring for 15 minutes.
Then, the dispersion liquid was filtered under reduced pressure, and further washed several times with water,
It was confirmed with a salt meter that sodium chloride was completely removed. The obtained powder is transferred to a metal vat, and the temperature is 85 ° C.
Drying was carried out for 12 hours with the blower dryer set to. The powder that has been dried is crushed using a mixer to obtain modified powder 9
8.2 g (yield 98.2%) was obtained. It was confirmed by an electron microscope and an infrared absorption spectrum analysis that almost all of the added LL was uniformly coated on the surface of the particulate zinc oxide in the obtained powder.

Example 2 (Production of Modified Powder of the Present Invention) Instead of using the fine particle zinc oxide in Example 1, Example 1 was used.
76 g of fine particle zinc oxide used in the above and plate-shaped barium sulfate (major axis 3 to 10 μm, minor axis 1 to 5 μm, thickness 0.1 to 0.3).
94.8 g (yield 94.8%) of modified powder was obtained through the same operation as in Example 1 except that 19 g of (μm) was thoroughly stirred and mixed using a juicer mixer. The obtained powder was confirmed by electron microscope and infrared absorption spectrum analysis that almost all of the added LL was uniformly coated on the surface of the mixed powder.

Comparative Example 1 (Powder of Comparative Example) The particulate zinc oxide powder used in Example 1 was used as Comparative Example 1.

Comparative Example 2 (Powder of Comparative Example) A powder obtained by simply mixing the same amount of zinc oxide and LL as those used in Example 1 in the same amount as in Example 1 with a mixer was used. And According to an electron microscope and infrared absorption spectrum analysis, the obtained powder was in a portion where the powder surface was not coated with LL, and the coating thickness was also non-uniform.

Comparative Example 3 (Powder of Comparative Example) 95 g of the fine particle zinc oxide used in Example 1 and 5 g of silicone oil (methylhydrogenpolysiloxane) were stirred and mixed, and then heat treated at 130 ° C. for 6 hours. The body was used as Comparative Example 3.

Comparative Example 4 (Powder of Comparative Example) In Example 1, 60 g of fine particle zinc oxide and 55.2 6N hydrochloric acid were used.
g, purified water 100 g, N-lauroyl-L-lysine 40
g, 59.6 sodium hydroxide aqueous solution 69.6 g, purified water 5
Using 20 g, 98.0 g (yield 98.0%) of modified powder having a coating amount of LL of 40% by weight was obtained.

Comparative Example 5 (Powder of Comparative Example) In Example 1, 99.9 g of fine particle zinc oxide, 6N hydrochloric acid 1.
Using 38 g, purified water 130 g, LL 0.1 g, 5N sodium hydroxide aqueous solution 1.74 g, and purified water 13 g, LL
As a result, 99.5 g (yield 99.5%) of a modified powder having a coating amount of 0.1% by weight was obtained.

Comparative Example 6 (Powder of Comparative Example) In Example 1, fine spherical zinc oxide particles having an average particle diameter (average particle diameter of 0.1.
The modified powder was obtained in the same manner as in Example 1 except that substantially spherical fine particle zinc oxide having an average particle diameter of 0.3 μm was used instead of (02 μm).

Table 1 shows the results of the evaluation of the sensory properties, antibacterial properties, and water repellency of the powders obtained above based on the evaluation test.

[0028]

[Table 1]

From the results shown in Table 1, untreated fine particle zinc oxide (Comparative Example 1), fine particle zinc oxide and N-lauroyl-L-
The simple mixture of lysine (LL) (Comparative Example 2) was dissatisfied with the feeling of use and water repellency, and the fine particle zinc oxide treated with silicone oil to make it water repellent (Comparative Example 3) lost the antibacterial activity. You can see that In comparison with them, the modified powders of Examples 1 and 2 of the present invention have a feeling of use, antibacterial properties,
It can be seen that the three items of water repellency are excellent in good balance.

Examples 3 to 4 and Comparative Examples 7 to 11 (Powder Foundation) According to the formulations in Tables 2 and 3, each powder foundation was prepared. As the compounded powder, the above-mentioned Examples 1 to 1 were used.
2, those obtained in Comparative Examples 1-2 and Comparative Examples 4-6 were used.

[0031]

[Table 2]

After mixing the powder components with a mixer,
The oil agent component was added and further mixed. After passing the obtained mixed powder through 60 mesh, it was stamped on a metal plate using a metal mold to obtain a product.

Table 3 shows the results of evaluation of the feeling of use, the durability of the cosmetic effect, and the antibacterial property based on the evaluation tests of Examples 3 and 4 and Comparative Examples 7 to 11.

[0034]

[Table 3]

From the results shown in Table 3, the modified powder of the present invention, zinc oxide having a specific particle diameter, was uniformly coated with N-lauroyl-L-lysine at a specific coating amount, and was modified. It can be seen that the powder cosmetics of Examples 3 and 4 in which the fine powders are blended have excellent organoleptic properties such as feeling in use when applied to the skin and durability of the cosmetic effect, and have antibacterial properties. .

[0036]

From the above, according to the present invention, the modified powder obtained by uniformly coating the surface of the powder having antibacterial activity with the acylated amino acid is excellent in the feeling of use, water-repellent, and
It is also clear that it has antibacterial properties. Furthermore, it is also clear that the powder cosmetics containing the modified powders have excellent feeling in use, long lasting cosmetic effect, and antibacterial properties.

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Claims (2)

[Claims] 1. An average particle size of 0.001 having antibacterial activity
It is obtained by uniformly coating a 0.1 μm powder surface with an acylated amino acid, the coating amount is 0.5 to 20% by weight, and the surface is water repellent and antibacterial. Characterized modified powder. 2. A powder cosmetic having an antibacterial property, which comprises the modified powder according to claim 1.