JPH01261315A - Skin cosmetic - Google Patents

Abstract

PURPOSE:To obtain a skin cosmetic having high safety and stability, excellent preventing effects on aging of skin and beautifying effects on skin free from peculiar odor and coloring resulting from addition of far infrared ray radiating cosmetic, by blending a skin cosmetic with far infrared ray radiating ceramic. CONSTITUTION:A skin cosmetic containing 0.01-20wt.% based on total amount of cosmetic of far infrared ray radiating ceramic powder (preferably 0.01-20mum) having >=180% electromagnetic wave radiation percentage based on the electromagnetic wave radiation percentage of a black material having the same temperature (30-70 deg.C temperature range) as a standard in 6-20mum wavelength. Cordierite (2MgO.2Al2O3.5SiO2) or zircon (ZrSiO4) is especially preferable as the ceramic. The cosmetic activates skin cells, densifies the structure of the cells, raises water retaining function, promotes turn over of keratin layer, improves skin drying and provides the skin with wetting properties, flexibility and elasticity.

Description

Detailed Description of the Invention (Technical Field) The present invention provides skin anti-aging effects (improving rough skin, moisturizing effects, promotion of keratin turnover) in which skin tissues can be activated by far infrared rays emitted by far infrared emitting ceramics. (effects, etc.) and skin cosmetics with excellent skin beautifying effects.

(Prior Art) Since cell metabolic function of the skin decreases in aging skin, anti-aging skin cosmetics containing various skin cell activating ingredients and blood circulation promoting ingredients have been proposed. However, conventional anti-aging skin cosmetics containing these anti-aging ingredients have drawbacks such as insufficient effects, irritation, coloring and odor.

In addition, ceramics have traditionally been used in skin cosmetics, but we focused on the far-infrared radiation that these ceramics possess, and formulated them by measuring the far-infrared radiation intensity at body temperature, outside temperature, room temperature, etc. No attempt was made to do so. In particular, the combination of zircon and cordierite, which have strong far-infrared radiation intensity, has not been studied.

(Disclosure of the Invention) As a result of intensive research by the present inventors to improve the above-mentioned drawbacks of anti-aging effects, the electromagnetic waves of 6 to 20 μm reach deep into the human skin, and have the effect of activating skin cells and promoting blood circulation. It has been found to have anti-aging and skin beautifying effects.

Therefore, as a result of various studies based on this knowledge, we found that the wavelength 6~
In the range of 20 μm, skin cosmetics containing ceramic powder with an electromagnetic wave radiation percentage of 80% or more based on the electromagnetic wave radiation amount of a black body at the same temperature will activate skin cells and increase their It has a skin-beautifying effect by densifying the structure, increasing the water retention function, promoting the turnover of the stratum corneum, improving dry skin, and giving the skin moisture (moist sensation), flexibility (smoothness), and elasticity. The present invention was completed based on this discovery.

(Objective of the Invention) In other words, the object of the present invention is to provide a product that is safe, highly stable, does not cause odor or coloring due to its formulation, and has skin aging prevention effects such as improving rough skin, moisturizing effect, and promoting stratum corneum turnover. The purpose is to provide skin cosmetics with excellent skin beautifying effects.

(Structure of the Invention) The present invention contains a ceramic powder that has an electromagnetic radiation percentage of 80% or more in the wavelength range of 6 to 20 m, based on the electromagnetic radiation amount of a black body at the same temperature. It is a skin cosmetic.

(Specific explanation of the structure) The TM wave radiation percentage in the present invention is the relative value of the sample at the same temperature, when the energy radiation intensity of an ideal black body in which the amount of energy radiation at a constant temperature follows Blank's law is taken as 100%. It is energy emissivity. Although the percentage of electromagnetic radiation of a sample does not vary depending on the temperature, since the sample emits far infrared rays when warmed by body temperature, in the present invention, as a far infrared emitting ceramic powder, it is possible to emit far infrared rays in the temperature range of 30 to 70°C with a wavelength of 6 μm to 6 μm. The radiation percentage of electromagnetic waves of 20 IJm is 80% or more.

Far-infrared emissive ceramics used in the present invention.

The powder is made of known magnesium oxide, aluminum oxide, zirconium oxide, silicon oxide, metal carbonate, clay mineral, etc., sufficiently uniformly in the ratio (stoichiometric ratio) shown in the chemical reaction formula below. It is obtained by mixing, baking at 1000°C or higher, and pulverizing. For example, cozy light (
2Mg0・2Al*Os' 5SiO*) is 9
It is obtained by mixing luc (3Mg0.4 S IO, .H,0), carrion (A1zo2.2SiO, .2H10), and magnesite (M g COx ), firing at 1400° C., and pulverizing the mixture. The chemical reaction formula is as follows.

3Mg0・4 S r Ot ・Hz O+ 8 (
A 1203・2510g ・2H□O)+5Mg
C0,→4(2Mg0・2AN!01・53i0t
)+178z O+5CO□ Also, zircon (ZrSiOa) is zirconia (Zr
It is obtained by mixing Oi) and silica (Sift), firing and pulverizing. It is also possible to use naturally occurring zircon as it is.

In the present invention, among these far-infrared emitting ceramic powders, cordierite and zircon are particularly preferred from the viewpoint of feel and effect.

The spectral infrared emissivity curves of the ceramic powder used in the present invention are shown in Figures 1 and 2, and the far-infrared radiation is clearly higher than that of titanium oxide (Figure 3) and talc (Figure 4). Excellent.

[Measurement method of spectral infrared emissivity curve]

The sample is measured using a Bruker FT-IR spectrometer model IF5-113V under the following conditions.

Detector: DTGS Attached device 2 Attached device for emission spectrum measurement Reference sample: Black body Measurement temperature: 60° Measurement wavelength: 6 to 20 μm Note that the above emissivity does not change depending on temperature, so it is easier to measure than near skin temperature. Measured at 60".

The particle size of the ceramic powder used in the present invention is 0.01 to 2.
It is 0 μm. If it is larger than 20 IIm, it will give a strange feeling to the skin, and if it is smaller than 0.01 μm, the catalytic action that degrades the oily base in cosmetics will be strong, which is not preferable.

Also, the blending amount is 0.0 based on the total amount of skin cosmetics.
A range of 1 to 20 weight percent (hereinafter abbreviated as wt%) is suitable. If it is less than 0.01 wt%, the effect will not be sufficiently achieved, and if it exceeds 20 wt%, it cannot be expected that the effect will improve commensurately with the increase.

The skin cosmetics of the present invention can be applied to, for example, calamine lotions, creams, creams, makeup assemblies, and the like.

In addition to the above-mentioned ingredients, the skin cosmetics of the present invention may contain pigments, fragrances, preservatives, surfactants, antioxidants, oil bases, etc. as appropriate within the scope of achieving the purpose of the present invention. can.

Examples of the present invention will be described below.

In the examples, parts mean parts by weight, and % means weight %. In addition, the storage stability test (presence of discoloration and odor), rough skin improvement effect test, moisturizing effect test, stratum corneum turnover improvement effect test, and sensory test (irritancy, wettability, smoothness, elasticity) shown in Examples. gender) are as follows.

il+ Storage Stability Test Samples were stored in a constant temperature room at 45° C. for 3 months, and then the presence or absence of changes in color and odor was examined.

+21 i Skin improvement effect test The application effect was investigated. 1 day per day on the subject's left lower leg test site.
Approximately 1 g of the sample was applied each time, and the condition of the skin before and after the start of the test was judged according to the following criteria. No sample was applied to the right lower leg, which served as a control.

Judgment criteria for skin dryness - 2 Normal ±: Slight dryness, no flaking +: Mild dryness, flaking + 8: Moderate dryness, flaking 10+] Dryness, flaking noticeable The judgment results of the test site and control site before and after the test were compared. The test was considered valid if the skin dryness improved by two or more levels (for example, +-1, +1-±), slightly effective if it improved by one level, and invalid if there was no change. Test results are valid,
It is shown by the number of subjects who were somewhat effective.

(3) Moisturizing effect test (TWL value reduction rate) TWL value and TWL value reduction rate (moisture retention The moisturizing effect was investigated by calculating the functional advanced effect) as follows.

■TWL value A method was used to measure the humidity change in the air above the sealed skin surface over a certain period of time using electrical resistance.

That is, the test subject's skin surface is sealed in a measurement cell, forced dry air is vented into the cell to sufficiently replace the inside of the cell with dry air, and then the ventilation of dry air is stopped and the cell is closed at that point. Determine the relative humidity RHs (%) in the cell, then let it stand for 10 minutes and then re-calculate the relative humidity RH in the cell. (%5 is measured, and from the humidity change at this time, the TWL value (mg/cm
”/hr) was calculated.

xlOO However, Dt: Density of saturated water vapor in the air at the measurement temperature (t”c) (mg/j) V: Cell volume (ll> S: Measurement area (cm”)) ■T W L 4 Reduction of Ii The reduction rate of the TWL value is T W L 4f before and after sample application.
It was calculated by substituting t, TWL, and TWLI into the following formula.

TWL value reduction rate = (1-TWLm / TWLa)
X 100 (χ)TWLA: T before sample application
WL value TWLI; T W L f + TWL after sample application
“Valid” if the value reduction rate is 20% or more, and the reduction rate is 2
If it was less than 0%, it was defined as [invalid]. The test results are expressed as the number of subjects out of 20 who were "effective".

(4) Effect test on improving stratum corneum turnover An ointment containing 5% by weight of the fluorescent dye danzyl chloride in white petrolatum was prepared and tested on the forearm skin of 20 middle-aged and elderly subjects complaining of rough skin, dry skin, and senile xeroderma symptoms. The patch is applied occlusively for 24 hours to allow danzyl chloride to penetrate and bind to the stratum corneum. After that, the test sample was applied to the same part of the left arm, and white petrolatum was applied to the right arm as a control twice a day (morning and evening), and the fluorescence of danzyl chloride was checked every day, and the number of days until the fluorescence disappeared was calculated from the stratum corneum layer. The turnover rate was set as still,
The normal turnover rate is 14-16 days, but
It is known that in aged skin, the skin length increases by around 18 days, and in an activated state, it tends to be shortened.

The turnover rate of the sample application area was 1 compared to the control area.
A reduction of 0% or more is considered "effective," a reduction of 5% or more is considered "slightly effective," and a reduction of 5% or less, no change, or increase is considered "ineffective." The results of the test were expressed as the number of subjects who answered "effective" or "somewhat effective."

(5) Sensory test Twenty middle-aged and elderly female subjects complaining of rough skin, dry skin, and senile xeroderma symptoms evaluated the effects after using the sample twice a day (in the morning and once again) for three consecutive months. The test results showed that the skin felt irritated, the skin felt moisturized, the skin became smooth, and the skin felt taut in terms of skin irritation, wettability, smoothness, and elasticity. Shown by number of respondents.

Examples 1 to 2, Comparative Examples 1 to 2 (0/W type skin cream) Various 0/W type skin creams were prepared by blending the following compositions except for the ingredients listed in Table 1 as various pigments and ceramics. A cream was prepared and tested.

(1) Composition Raw material composition Amount (wt%) A) Ingredients shown in Table 1 Blend amount shown in Table 1 B) Liquid paraffin 15.0 Beeswax
5.0 stearic acid
3.0 Sorbitan Sesquioleate 2.0 Setanol 2.0P, O, E
Sorbitan monooleate (20E, 0.) 5
．． 0 C) Glycerin 5.0 Methyl-
P 0.1 purified water
Amount to make the total amount 100 wt% (2) jJi manufacturing method Component A) is uniformly dispersed in a mixture of component C) heated and dissolved at 80°C, and component B) heated and dissolved at 80°C is added thereto while stirring. Each skin cream was prepared by cooling to 30°C.

(3) Characteristics As shown in Table 1, the skin creams of Comparative Examples 1 and 2 containing titanium oxide and talc, which do not emit much far-infrared rays, are inferior in anti-aging effects such as improving rough skin and moisturizing effects. there were. On the other hand, the skin cream of the present invention containing zircon and cordierite was excellent in storage stability, anti-aging effect, etc., and the difference was clear.

Comparative Example 3.4 A comparative skin cream was prepared using the same composition and preparation method as in Example 1, except that the ingredients shown in Table 1 were added as anti-aging agents. Its properties are shown in Table 1.As is clear from Table 1, the skin cream of Comparative Example 3 containing vitamin E as an anti-aging agent had an anti-aging effect but had poor storage stability. The skin cream of Comparative Example 4 containing ethyl nicotinate as a skin cream had skin irritation and was not preferable.

Examples 3 to 8 (0/W type skin milk) Various 0/W type skin milks were prepared and tested using the following compositions except that the amount of zircon was varied as shown in Table 2.

(1) &tl Raw material composition Blend amount (wt%) A) Zircon
Star shown in Table 2 B) Liquid paraffin
10.0 Cetanol 2.
0 Cholesterin 1.0 Sorbitan monooleate 0.50) Sodium cetyl sulfate 0.8 Purified water Total amount to 100wt
Amount expressed as % (2) Preparation method carried out in the same manner as at.

(3) Properties As shown in Table 2, the skin milk of the present invention had excellent storage stability and anti-aging effects.

Example 9 (Calamine low silane) Raw material composition Blending amount (wt%) Kojilite 1.0 Ethyl alcohol
10.0 Glycerin 3.0 Purified water 86.0 The above bottoms were uniformly mixed to prepare the calamine lotion of the present invention. Its characteristics are shown in Table 3.

As is clear from Table 3, the calamine lotion of the present invention had excellent storage stability and anti-aging effects.

(Effects of the Invention) As described above, the present invention provides useful skin cosmetics with excellent storage stability and anti-aging effects.
table

[Brief explanation of the drawing]

Figures 1 to 4 show the spectral infrared emissivity curves of zircon, cordierite, titanium oxide, and talc.

Claims (1)

[Claims] 1) A skin cosmetic characterized by containing far-infrared emissive ceramic powder that has an electromagnetic radiation percentage of 80% or more in the wavelength range of 6 to 20 μm, based on the electromagnetic radiation amount of a black body at the same temperature. fee.