JPH04295416A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic capable of protecting epidermises of human bodies against sunrays, especially infrared rays. CONSTITUTION:A cosmetic is obtained by blending diamond particles, preferably having 0.01-40mum average particle diameter and <=50mum maximum particle diameter in an amount of 0.1-50wt.% based on the whole cosmetic therein. Thereby, the aforementioned cosmetic is excellent in infrared ray shielding effects and effects such as impartment of refreshing feeling and makeup durability accompanied therewith are remarkably improved. Makeup effects such as transparency can simultaneously be further improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cosmetics, and more specifically, it is an object of the present invention to provide a cosmetic that can protect the epidermis of the human body from sunlight, particularly infrared rays.

0002

[Prior Art] Generally, sunlight reaching the earth's surface includes ultraviolet rays with a wavelength range of 290 to 400 nm and ultraviolet rays with a wavelength range of 400 nm.
Visible light with a wavelength range of ~800 nm as well as 800 nm
There is infrared rays with a wavelength range of nm (0.8 μm) to 1 mm, and among these, infrared rays can be further divided into near infrared rays of about 2.5 μm or less, normal infrared rays of 2.5 to 25 μm, and far infrared rays of about 25 μm or more. It has been known.

[0003] Up until now, many UV absorbers and UV scattering agents have been developed because UV rays cause harmful effects such as erythema and skin browning. It has become clear that infrared rays, especially near infrared rays, that reach the dermis cause blood vessels to dilate and increase skin temperature, giving a sensation of heat pain and even causing burns. It has become known that it modifies the elastic fibers of skin and accelerates aging phenomena such as wrinkles and sagging.

[0004] Conventionally, there have been various cosmetics and methods as described below as means for protecting against infrared rays. ■ Talc [3MgO・4
SiO2 ・H2 O or (OH)2 Mg3 (Si
O5)2], magnesium silicate powder such as chlorite, magnesium aluminosilicate powder such as cordierite, isodialite, pyrope, and muscovite [K
Al2 (AlSi3 )O10(OH)2 or K2
O・3Al2 O3 ・6SiO2 ・2H2 O]
, Method of blending potash, alumina, silicic acid powder such as sericite ■ JP-A-62-149613 and JP-A-63-2
"Aluminum powder, gold powder,
``Cosmetics containing metal powder such as silver powder or flaky metal oxide powder such as flaky titanium oxide or flaky zirconium oxide'' ■ ``Cosmetics containing metal powder on the surface of metal aluminum'' described in JP-A No. 63-27419. "Cosmetics containing colored metal aluminum with oxides attached" ■Recently developed composite powders with fine particles of zirconium oxide attached to the surface of true spherical polyamide powder, and composite materials with sintered zirconium oxide and cerium oxide. ■ Other methods using reduced products of 6-tungsten chloride

[0005]

[Problems to be Solved by the Invention] However, each of the above conventional techniques has the following drawbacks. ■ In the method of blending magnesium silicate-based powder, magnesium aluminosilicate-based powder, and potash-alumina-silicate-based powder, all of these powders have a wavelength of 1 μm, which is the most problematic for the skin. There is no absorption band in the near-infrared region; for example, talc, muscovite, sericite, etc. have absorption at wavelengths of 9.5 to 10 μm or more, and cordierite, pyrope, etc. have radiation characteristics in the far-infrared region. There is.

[0006] ■ Various powders in cosmetics obtained in JP-A-62-149613 and JP-A-63-27421 have low visible light transmittance because metal powders such as aluminum powder are metals. has poor opacity,
Furthermore, it has the property of being thick on the skin, resulting in a thick, opaque makeup finish, and also has the disadvantage that the metal itself usually has a silver-gray color, giving the makeup finish a greyish tone and making it feel dull.

On the other hand, titanium oxide, which is one of the flaky metal oxide powders, has almost no absorption in the infrared region, and zirconium oxide is produced by the KBr method (0.7mg/300mg).
Although it has an absorption band at a wavelength of approximately 15 to 20 μm, the transmittance is 82.5 at a wavelength of 1 μm.
%, so we cannot expect much of a cutting effect in the near-infrared region.

[0008] ■ The colored metal aluminum used in cosmetics obtained in JP-A No. 63-27419 has a less greyish makeup finish than when aluminum powder is used, but metal oxides are formed during the pulverization process. If more than 3% is added, the same dullness phenomenon as with aluminum powder is observed. Furthermore, there is a tendency for the difference between the coating color and the external color to become large, and this tendency becomes even greater when the amount necessary to block infrared rays is used.

[0009] In the method of using a composite powder in which fine particles of zirconium oxide are attached to the surface of a true spherical polyamide powder, in addition to the weak cutting effect of zirconium oxide in the near-infrared region as described above, the amount attached to the surface is Since the infrared absorption of the polyamide powder is mainly detected, there is little hope that zirconium oxide will have a cutting effect.On the other hand, even with a method using a composite material made by sintering zirconium oxide and cerium oxide, Cerium is 18μm
Since it has a strong absorption band in the above wavelength range, a composite of the two can be used as a material with far-infrared radiation properties, but it cannot be expected to be effective as a near-infrared shielding material at all.

■ In the method using a reduced product of 6-tungsten chloride, it is known that this substance has a high absorption effect at a wavelength of 1 μm, but if exposed to light for a long time, the color may fade or become darker. It has the disadvantage of poor stability.

[0011] The present invention has been made in view of the above circumstances, and has a sufficient effect of blocking infrared rays, especially near infrared rays, and is capable of imparting a refreshing feeling and an effect of preventing a rise in skin temperature. The purpose of the present invention is to provide a cosmetic that is not only effective, but also does not impair makeup effects such as transparency.

0012

[Means for Solving the Problems] As a result of extensive research in order to solve the above problems, the present inventors discovered that diamond powder has an excellent infrared shielding effect, and based on this, the present invention was completed.

That is, the present invention is a cosmetic containing diamond powder, and in a preferred embodiment, the average particle size of the diamond powder is 0.01 to 40 μm and the maximum particle size is 50 μm or less, or the diamond powder is The present invention relates to a cosmetic composition in which the blending amount is 0.1 to 50% by weight based on the total cosmetic composition.

The present invention will be explained in detail below. The diamond powder used in the present invention is made of carbon, which has an atomic number of 6 and belongs to Group 4 of the periodic table, has a neutral electronegativity, and has a jungle gym-like structure with atoms bonded together through covalent bonds. have. Diamond is also transparent, has the highest Mohs hardness of any material on earth, and has excellent electrical insulation properties.

A diamond crystal is a typical covalently bonded crystal in which each carbon atom shares its own electron. Impurities contained in natural diamonds include N atoms and B atoms,
These impurities often partially replace C atoms in the diamond lattice to form a solid solution. Furthermore, diamonds are generally classified into type I and type II, and further divided into type a and type b, respectively. This classification depends on the content of N atoms and their existence, or whether or not B atoms are included. In type Ia, N atoms exist as a precipitated layer between crystal lattices in the form of a thin film parallel to the {100} plane of the crystal. In type Ib, N atoms replace C atoms constituting the diamond crystal and form a solid solution. The N atom content of IIa and IIb is extremely small, and like the type Ib, C atoms are substituted and dissolved in solid solution. Most naturally occurring diamonds are type Ia. High-pressure synthetic diamond using a catalytic metal is type Ib and contains many N atoms, but due to the environment in which diamond grows, N
By removing atoms, type IIa diamond or type IIb diamond added with type B atoms can be synthesized. In the cosmetic of the present invention, any of the types of diamond powder described above can be used.

[0016] The average particle diameter of the diamond powder is 0.01 to 40 μm, preferably 0.1 to 25 μm.
On the other hand, particles having a diameter of 50 μm or less, preferably in the range of 0.01 to 50 μm, can be advantageously used from the viewpoint of feel and decorative finish.

[0017] Next, there is no particular restriction on the amount of diamond powder blended in the cosmetic of the present invention, but when considering the infrared ray cutting effect and other ingredients contained in the cosmetic, it is 0.1-50% by weight,
Preferably, the range is selected from 1 to 30% by weight depending on the dosage form and purpose.

In the cosmetic composition of the present invention, a conventionally known ultraviolet blocking substance may be blended together with the above-mentioned diamond powder, if desired, so that the cosmetic composition can block both infrared rays and ultraviolet rays at the same time and is suitable as a summer cosmetic. You can get something. Specific examples include aminobenzoic acid-based ultraviolet absorbers such as ethyl para-aminobenzoate and 2-ethylhexyl para-diethylaminobenzoate; cinnamic materials such as propyl para-methoxycinnamate and 2-ethylhexyl para-methoxycinnamate Acid UV absorbers, salicylic acid UV absorbers such as menthyl salicylate and benzyl salicylate, 2-hydroxy-4-methoxybenzophenone,
Benzophenone ultraviolet absorbers such as 2,2',4,4'-tetrahydroxybenzophenone, 4-t-butyl-
Examples of dibenzoylmethane ultraviolet absorbers such as 4'-methoxydibenzoylmethane, and ultraviolet scattering agents include titanium oxide, finely divided titanium oxide, finely divided zinc oxide, and finely divided iron oxide. 5-30
It is blended in a range of % by weight.

[0019] In addition, as for the ingredients other than diamond powder and ultraviolet blocking substances, all the raw materials normally used in cosmetics can be used, and specifically, various oils,
Powder and/or pigment, surfactant, thickener, preservative,
It contains antioxidants, fragrances, and various chemicals, and there are no restrictions on manufacturing methods.

Furthermore, in the form of cosmetics, there are a wide range of applications, mainly makeup cosmetics such as lipstick, foundation, eye products, blusher, powder powder, eye shape powder, etc., as well as milky lotions, creams, antiperspirants, etc. is possible.

[0021] Here, the features of the present invention will be described in detail: (1) When the cutting power of zirconium oxide, which is conventionally known as a typical infrared cut agent, in the near-infrared region of 1 μm is set to 1, the cutting power of clay minerals is 1 μm. The representative talc is 0.2 times,
While aluminum powder has 0.97 times the cutting power, diamond powder has approximately twice the cutting power, and can provide cosmetics with a strong infrared protection effect on the skin.

[0022] ■ In the near-infrared region of 1 to 2.5 μm, where thermal energy is higher, the cutting power of zirconium oxide gradually decreases, whereas diamond powder, like aluminum powder, has the same level of cutting power at a wavelength of 1 μm. Furthermore, diamond powder has a pale olive color, which is close to human skin tone, so it is possible to mix in high concentrations while preventing dullness and white cast, which are disadvantages when using aluminum powder. and does not impair the makeup effect.

[0023] Diamond powder blocks near-infrared rays that harm the elastic fibers of the dermis, but is highly transparent to far-infrared rays, which are absorbed by the human epidermis and converted into thermal vibrations.
It is expected to have anti-aging effects on the skin by gently stimulating the capillaries in the dermis, promoting blood circulation and activating metabolism.

[0024]Diamond powder blocks a wide range of near-infrared rays, which are known as strong heat rays, so it can suppress the rise in skin temperature and provide a refreshing feeling for a long time. It can reduce the secretion of sebum and sweat and improve the longevity of makeup.

[0025] In complex oxides such as clay minerals, alkaline ions are eluted with sweating, and the skin surface becomes alkaline. This differs from the original pH of the skin surface, which is 5 to 6, and also causes a feeling of discomfort in the cosmetic film on the skin. Diamond powder does not elute alkaline ions, suppresses skin discomfort, and is also excellent in terms of safety.

Next, the diamond powder according to the present invention is
A transmission spectrum diagram is shown to show how superior the cutting effect in the near-infrared region is compared to conventional infrared protection materials. The samples used were diamond powder (3.5 μm), talc powder (3.8 μm), metal aluminum powder (9.4 μm), and zirconium oxide powder (4.2 μm), and the KBr method (sample 0.7 mg) was used.
/300mgKBr). ■ Diamond powder (Figure 1) ■ Talc powder (Figure 2) ■ Metallic aluminum powder (Figure 3) ■ Zirconium oxide powder (Figure 4) As is clear from the transmission spectrum diagram, the diamond powder according to the present invention is different from conventional infrared protection materials. It has been demonstrated that it has a higher infrared ray cutting effect compared to the previous one.

[0027]

[Examples] Examples of the present invention are shown below. Incidentally, the blending ratio is in parts by weight.

Example 1. Summer cake foundation (A) Silicone treated sericite
25
siliconized talc

8 Silicon-treated titanium oxide
20 Ultrafine particle titanium oxide
10 Spherical polymethyl methacrylate powder
5 Colored titanium oxide coated spherical nylon powder
10 Diamond powder (average particle size 0.1 μm) 3
Silicone treated valve handle

1.7 Silicon-treated yellow iron oxide
4.4 Group Blue

0.1 (B) Methylpolysiloxane

4.5 Glycerin tri-2-ethylhexanoate
3.0 Squalane

5.0
Methylparaben

0.2 Fragrance

0.1 (Preparation method) Put (A) into a Henschel mixer, stir, take out, and grind with a grinder. Next, the pulverized product is transferred to a Henschel mixer, and (B) is added thereto and mixed, taken out, and filled into a medium dish to form a product.

Example 2. Cheek shadow cake (A
) Diamond powder (average particle size 3μm)
50 Silicon treated sericite
25
siliconized talc
7.3
5 Titanium mica

2 Coral fine powder

2
Red No. 226

0.2 Silicon treated valve handle

0.15 Silicon-treated yellow iron oxide
0.85
group blue

0.15 (B) Methylpolysiloxane
4.5
Glycerin tri-2-ethylhexanoate
2.5
Octyldodecyl oleate
2
Diglycerin triisostearate
3
ethylparaben

0.2 Fragrance

0.1 (preparation method) (
A) is mixed by stirring in a Henschel mixer, and then pulverized with a pulverizer. Next, the pulverized product is transferred to a Henschel mixer, and after adding (B) and mixing with stirring, it is taken out and filled into a medium dish to form a product.

Example 3. liquid foundation
(A) Cetyl 2-ethylhexanoate
2
stearic acid

1 Setanol

0.5
behenyl alcohol
0.
5 Squalane

1 Glycerin tri-2-ethylhexanoate
1 Sucrose fatty acid ester
1 Diamond powder (average particle size 25 μm)
5 Volatile silicon
1.5
Activator

4 Pigment paste

5 (B) Propylene glycol
4
glycerin

5 Methylparaben

0.2 Caustic potash solution
2
thickener

0.3 Purification
water
65.9
(C) Flavoring

0.1 (Preparation method) (A) was dissolved at 80°C in a melting pot, and then dissolved separately (B)
After adding and emulsifying and cooling to 40°C, (C) is added and further cooled to room temperature, taken out and filled into containers to make a product.

Example 4. Under makeup (A
) Octyldodecyl erucate
1
Setanol

0.1 Diamond powder (
Average particle size 5.3μm)
0.1 Activator

4
water soluble silicone
0
．． 3 Liquid paraffin

0.8 (B) Propylene glycol
5 Glycerin
10
thickener

0.2 Methylparaben
0.2
maltitol

0.2 Caustic potash

0.07
purified water

77.93 (C) Flavorings

0.1 (Preparation method) After dissolving (A) at 80°C in a dissolving pot, separately dissolved (B) was added and emulsified. After that, 4
Cool to 0°C, add (C), cool to room temperature, take out, fill in a container, and use as a product.

Example 5. Lipstick (A) Microcrystalline wax
11.2
candelilla wax
5
polyethylene wax

6 Diamond powder (average particle size 1.2 μm) 11
olive oil

2 Octyldodecyl oleate
36 Cetyl 2-ethylhexanoate
20 Activator

0.5
titanium oxide

1 Titanium mica

2
legal dye

5 Valve handle

0.2
fragrance

0.1 (Preparation method) (A) is charged into a dissolving pot, uniformly dispersed and dissolved at 80°C, and then defoamed. after that,
After pouring it into a mold and cooling it, it is put into a container and used as a product.

(Comparative Experiment) The cosmetics obtained according to the present invention, conventional cosmetics, and comparative cosmetics were compared by infrared ray cutting effect and sensory evaluation.

<Infrared cutting power test> Sample (a) Summer cake foundation of Example 1 of the present invention (B) Cheek shadow cake of Example 2 of the present invention (C)
Liquid foundation according to Example 3 of the present invention (D) Under makeup according to Example 4 of the present invention (E) Lipstick according to Example 5 of the present invention (F) Summer cake foundation from manufacturer A (G) Product from manufacturer B Summer cake foundation (k) Summer cake foundation made by C manufacturer (k) Comparative summer cake foundation in which the diamond powder in the summer cake foundation of Example 1 of the present invention was replaced with metal aluminum powder (9.4 μm)

Experimental method: A dispersion of 1 g of sample in 4 g of castor oil was coated on a slide glass to a thickness of 0.5 mil, and an infrared lamp was applied to the sample, which was set in the light receiving section of an integrated illumination meter. The sample was irradiated with infrared rays for 5 minutes, the count on the illuminance meter was read, the infrared transmittance was calculated, and the reciprocal of the infrared transmittance was determined as the infrared cut rate.

[0036]

[Table 1]

As shown in the results in Table 1, it was demonstrated that the cosmetic of the present invention has an excellent infrared ray cutting effect.

<Heat Sensory Test> Samples The same summer cake foundations of the present invention (a) and comparative product (ke) as those used in the infrared cutting power test above were used.

Experimental Method Samples of the product of the present invention and the comparative product were tested in a blind test. Specifically, 32 female panelists were asked to apply both samples to half their faces and judge for themselves which one felt less hot under infrared rays from an infrared lamp and under the scorching midday sun. Ta.

[0040] As a result of the experiment, those who answered that the product of the present invention clearly felt less heat were:
Of the 32 people, 29 people responded to the infrared lamp, and 31 responded to the sunlight, indicating that the product of the present invention is significantly more effective in suppressing heat sensation than the comparative product.

<Sensory test based on actual use> Samples The same summer cake foundations of the present invention (A) and commercial products (F), (G), and (H) as those used in the infrared cut power test were used. .

Experimental Method: 148 women who regularly use Summer Cake Foundation were randomly divided into 4 groups (37 women each) (A to D).
group). The product of the present invention (A) was administered to Group A, the commercially available product (F) was administered to Group B, the commercially available product (K) was administered to Group C, and the commercially available product (Q) was administered to Group D for 2 months. For each sensory evaluation item, perform a sensory evaluation using a 10-point scale.
Table 2 shows the average value of 37 people (rounded down to the second decimal place).

[0043]

[Table 2]

As shown in the results in Table 2, the summer cake foundation of the present invention not only has better overall quality than the commercially available summer cake foundation.
In particular, it was proven to be excellent in terms of makeup retention and refreshing feeling.

[0045]

[Effects of the Invention] According to the present invention, compared to cosmetics containing conventionally known infrared protection substances, the infrared ray blocking effect is superior, and the associated cooling sensation and makeup lingering properties are improved. Not only is the effect significantly superior, but also the makeup effects such as transparency and uniformity of application can be further improved.

[Brief explanation of drawings]

Claims (3)

[Claims] [Claim 1] A cosmetic containing diamond powder. [Claim 2] The diamond powder has an average particle size of 0.0.
The cosmetic according to claim 1, which has a particle size of 1 to 40 μm and a maximum particle size of 50 μm or less. 3. The cosmetic composition according to claim 1, wherein the amount of diamond powder blended is 0.1 to 50% by weight based on the total cosmetic composition.