WO2000037581A1

WO2000037581A1 - Ultraviolet shielding agents

Info

Publication number: WO2000037581A1
Application number: PCT/JP1999/007195
Authority: WO
Inventors: Nobuo Someya; Hideo Someya; Hiroshi Akai; Katsumi Imada
Original assignee: Marine Bio Co., Ltd.
Priority date: 1998-12-22
Filing date: 1999-12-21
Publication date: 2000-06-29
Also published as: JP2002193780A

Abstract

Ultraviolet shielding agents capable of strongly shielding ultraviolet rays which are produced starting with natural substances and safe to the skin. These ultraviolet shielding agents contain, as the main components, an optionally decarboxylated coral sand powder and a wild silkworm cocoon shell powder. The coral sand and the wild silkworm cocoon shells, which are both natural materials capable of strongly shielding ultraviolet rays, can be safely employed.

Description

Description Ultraviolet ray shielding technical field

The present invention relates to an ultraviolet shielding agent using a powder made of a natural material. Background art

In cosmetics and the like, it has been conventionally used to block ultraviolet rays by blending a powder of titanium oxide. This is because titanium oxide has skin covering power, so that it blocks ultraviolet rays, and because titanium oxide has light-reflecting power, it reflects ultraviolet rays.

However, titanium oxide has a limit in its ability to block ultraviolet rays, making it impossible to adequately block ultraviolet rays. Titanium oxide has the power of starting from mineral resources and is manufactured industrially.It has a lower affinity for skin than natural materials starting from animals and plants, and is applied to the skin. This tends to accumulate stress on the skin. For this reason, there is anxiety about safety for skin tissue.

In addition, titanium oxide has a large covering power on the skin, and has a problem that, when applied to the skin, it inhibits skin respiration. Furthermore, as titanium oxide is used as a white pigment, UV shielding agents containing titanium oxide develop a white color, so applying UV shielding agents to the skin turns the skin white and unnatural. It feels like For this reason, their use tends to be neglected. The present invention has been made in view of such conventional problems, has a strong ultraviolet shielding power, and has good affinity for skin by using a natural material as a starting material. And does not interfere with skin breathing, An object of the present invention is to provide an ultraviolet shielding agent that can be applied to the skin without causing unnaturalness. Disclosure of the invention

In order to achieve the above object, the present invention is characterized in that the main components are powder of coral sand and powder of cocoon shell of wild silkworm. In addition, the present invention is characterized in that a treated powder obtained by subjecting a coral sand powder to a decarboxylation treatment and a powder of a cocoon shell of a wild silkworm are used as main components.

The coral sand used in the present invention is obtained from fossil coral reefs. Therefore, it is a natural substance containing calcium, not only containing calcium carbonate as a main component, but also a small amount of iron, copper, zinc, manganese, magnesium, sodium, potassium, phosphorus, etc. It contains many elements useful for the human body, such as cobalt and chromium.

These elements are accumulated and weathered by the life activities of reef-building corals, which are coelenterates. For this reason, coral sand, unlike substances obtained by chemical treatment, has a biological tissue of biological origin, has a great affinity for the skin, does not cause stress on the skin, and is safe. Can be used. In addition, coral sand powder is porous, so it does not not only prevent skin respiration, but also can efficiently absorb sebum, sweat, and other excretions from the skin through many small pores. Cleaning can be performed. Furthermore, coral sand has weak alkalinity and has a neutralizing effect on skin that has become weakly acidic due to fatigue, so it can activate the skin.

Such a coral sand powder has a large number of pores and a network-like skeletal structure, which makes it possible for the coral sand powder to diffusely reflect ultraviolet light in many directions and shield it. it can. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a characteristic diagram of a spectral reflectance curve of a coral sand according to the ultraviolet shielding agent of the present invention, and FIG. 2 is a characteristic diagram of a spectral absorbance curve of a coral sand according to the ultraviolet shielding agent. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

Figure 1 is a comparison measurement of the spectral reflectance in the ultraviolet to visible light region of the coral sand and titanium oxide (T i 0 _2), FIG. 2 shows a comparison measured spectral absorbance similarly. The measurement was performed with a spectrophotometer (Shimadzu Corporation)

(Manufacturer)) with an integrating sphere attachment was used, and the reflectance of 100% of the standard white plate was used as a blank. Sample 1 to Sample 3 are coral sand powder, Sample 1 is about 6 μm particle size, Sample 2 is about 44 m particle size, Sample 3 is a mixture obtained by simply grinding coral sand and not classified. This is a sample of particle size. The comparative sample is titanium oxide.

The following values are based on the spectral reflectance of Fig. 1, and are based on UV (ultraviolet light with wavelength of 280 to 400 nm), UV-A (ultraviolet light with wavelength of 320 to 400 nm), and UV-B ( The reflectance was calculated for ultraviolet light having a wavelength of 280 to 320 nm. The reflectance is calculated by (intensity of light reflected by sample) / (intensity of light irradiated on sample). Ultraviolet rays-Sample: L5 type 4 Otsu S type not 40 Comparative sample

U V 8 2 4% 7 3 7% 5 3.7% 2 4 3%

UV-A 8 4 1% 7 6 3% 56.1% 3 36% UV-B 79.0% 68.4% 48.8% 5.5% In general, the light shielding effect can be attributed to either reflection or absorption. When the powder particles are applied densely, a reflecting surface is formed, and thus the higher the reflectance, the greater the shielding effect. On the other hand, when the powder particles are applied coarsely and densely, part of the light passes through the gap between the powder particles, and part of the light passes through the powder layer while being repeatedly reflected and absorbed on the surface of the powder particles. The greater the absorbance, the greater the shielding effect. From the above values and Fig. 1 and Fig. 2, in the wavelength range of 280 to 400 nm, sample 1 is 3.4 times, sample 2 is 3 times, and sample 3 is 2.2 times compared with the comparative sample. UV light is reflected at the value of. In particular, in the UV-B region, which is greatly involved in skin inflammation and darkening or skin aging and skin cancer, sample 1 is 14.4 times, sample 2 is 12.4 times, and sample 3 is 8 UV light is reflected at 9 times the value, indicating that UV light is strongly shielded.

In the visible light region, all of Samples 1 to 3 have smaller reflectance and absorbance than the comparative sample. This suggests that applying coral sand powder to the skin does not make it as white as titanium oxide. Therefore, there is an advantage that even if the coral sand powder is applied to the skin, it does not become unnatural, and its use is not reduced.

The particle size for ultraviolet shielding in such a coral sand is not particularly limited, since the sample 3 having a mixed particle size obtained by merely pulverizing as described above has a sufficient shielding power. In consideration of the rough feeling when applied to the surface, the feeling of discomfort is good, it is good to be benign to about 1 to 300 m. The coral sand may be used as it is after being ground and used as it is. After desalting by washing, the coral sand may be heated and disinfected at about 80 ° C to 120 ° C and ground.

In the present invention, in addition to the above, a treated powder obtained by decarbonating coral sand powder can be used. Decarbonation treatment is ground coral sand The powder can be heated to 600 to 100 ° C., and the heating can be performed by gasifying and removing carbon dioxide and hydrogen carbonate contained in the powder. In such removal by gasification, many small holes remain after the gas is diverged, so that the treated powder can be porous with more holes grown. Therefore, the effect of irregularly reflecting ultraviolet rays is increased, and the ultraviolet ray shielding power is further increased. In addition, it can not only assist skin respiration, but also can more efficiently absorb excrement from the skin. The decarbonated coral sand treated powder may be used as an ultraviolet shielding agent independently of the above-described coral sand powder, or may be mixed with the coral sand powder and used as an ultraviolet shielding agent.

In the present invention, the above-described coral sand powder and wild silkworm cocoon shell powder are blended as main components. Wild silkworms belong to the family Jamagamuga and belong to the family of Southeast Asia, China, and Africai. It lives as An aphereticulata), Mugasan (Antheraeaass ama), and Cricuiatr ι fenestrata. One of these wild silkworms may be used, or a plurality of species may be mixed and used.

The cocoons of these wild silkworms become porous fibers containing pores of about 1 to 01 / m. When used in the present invention, it becomes possible by drying the cocoon shell of wild silkworm and then pulverizing it by a pulverizer into powder. The particle size of the powder is about 10 to 50 / m. The crushed wild silkworm powder, like the cocoon thread, is porous with a large number of small holes, and can satisfactorily reflect ultraviolet light.

The powder of the cocoon shell of such wild silkworm is a material that naturally inhabits, and unlike the material obtained by chemical treatment like coral sand, It has a biological tissue. Therefore, like coral sand, it has a great affinity for the skin, and can be used safely without causing stress on the skin. In addition, because it is porous, it does not interfere with skin respiration when applied to the skin, and efficiently absorbs sebum, sweat, and other excrement from the skin.

The following values show the results of measuring the ultraviolet spectral absorbance of the cocoon shell of wild silkworm in the same manner as the above-mentioned coral sand. The smaller the value of the spectral absorbance, the lower the transmittance of ultraviolet light. From the following values, it can be seen that the powder of the cocoon shell of each wild silkworm has a remarkably low transmittance of ultraviolet light and has the ability to shield ultraviolet light well.

UVUV-AUV--B Saksan 11.0% 14.0% 4.5% Evening Sarsang 12.0% 15.1% 5.0% Erysan 12.5% 15.5% 5.5. 5% Xanafe 10.6% 12.5% 4.0% Mugasan 11.2% 13.6% 4.5% Kurikyura 11.5% 14.6% 5.0% In the present invention The mixing ratio of the coral sand powder and / or the decarbonated powder of the coral sand powder to the powder of the cocoon shell of the wild silkworm was 10%. From 90 to 90% by weight, 90 to 10% by weight of cocoon shell powder of wild silkworm is good, but the mixing ratio is not limited to this. In addition, in the present invention, a pigment such as a para-amino acid benzoic acid-based compound, a hydrobenzophenone-based compound, or other known UV absorbers or titanium oxide may be added. In addition, natural algae such as seaweed and Z or dyes A coloring agent may be added, and the ultraviolet light can be almost completely blocked by these additions.

The above-mentioned ultraviolet shielding agent of the present invention can be used by dispersing it in a known cosmetic. Various types of cosmetics such as liquid, gel, and cream can be appropriately selected.

For the liquid type, hydrocarbon oils such as liquid paraffin, olive oil, wheat germ oil, nut oil, corn oil, rice bran oil, rice germ oil, vegetable oils such as barley oil, jojoba oil, grape seed oil, squalane and horse Animal oils such as oil, and lower alcohols such as other oil-germal denatured alcohols can be appropriately blended and used.

The gel type can be produced by blending a cellulose derivative such as CMC, a thickening agent such as PVP, carboxyvinyl polymer or carrageenan, in addition to these oils and alcohols. In the cream type, only oils such as liquid paraffin, vaseline, and beeswax may be used, or these oils and water may be emulsified with a surfactant. The emulsification type may be any of a W / 0 emulsification type and an OZW emulsification type.

By dispersing the UV-screening agent of the present invention in the above-mentioned cosmetics, the UV-screening agent dispersed in the cosmetics is evenly applied to the skin at the same time as applying the cosmetics to the skin. UV irradiation can be reliably blocked.

As described above, the ultraviolet ray shielding agent of the present invention has a strong ultraviolet ray shielding power and is made of a natural material as a starting material. Moreover, unnatural application to the skin is also eliminated. Still further, the ultraviolet ray shielding agent of the present invention is characterized in that ultraviolet rays are mostly reflected and shielded by a composition composed of coral sand, but slightly leaked. Ultraviolet rays are absorbed and blocked by the composition of the powder of silkworm cocoons, etc., and both have the effect of performing a complete ultraviolet cut. Industrial applicability

As described above, the ultraviolet shielding agent according to the present invention is extremely suitable for use as various types of cosmetics.

Claims

The scope of the claims

1. An ultraviolet ray shielding agent comprising, as main components, powder of coral sand and powder of cocoon shell of wild silkworm.

2. An ultraviolet ray shielding agent comprising, as main components, a processed powder obtained by decarbonating coral sand powder and a powder of cocoon shell of wild silkworm.