JP2000072621A - Powder for summer cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of suppressing the generation of a fresh radical of titanium dioxide. SOLUTION: The external dermal preparation such as cosmetics includes powder for composition for external dermal preparation comprising uniformly existing titanium dioxide including 0.1 to 10 wt.% one or more kinds of elements selected from aluminum, zirconium, zinc, silicone and cerium. The means capable of suppressing the generation of fresh titanium radical is provided by this preparation and a more safe cosmetic can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a powder for a composition for external use on the skin which is suitable for cosmetics and the like.

[0002]

2. Description of the Related Art Powders represented by titanium dioxide are widely used for concealing the skin and are used in external compositions for the skin such as cosmetics and external medicines for the skin. Among them, titanium dioxide is widely used in cosmetics for the purpose of protecting the skin from ultraviolet rays since it has an excellent ultraviolet ray cutting effect. However, it has been pointed out that in the titanium dioxide, the radicals released after absorbing the ultraviolet ray offset the ultraviolet ray protective action of the titanium dioxide. That is, by suppressing the generation of the radical, titanium dioxide can be used more effectively, and such a technique has been desired.

[0003] As a means for preventing the generation of radicals of titanium dioxide, a method of coating titanium dioxide with another metal oxide is known. However, in these methods, the color of the metal oxide is affected by titanium dioxide. In many cases, toning became difficult. Further, a technique of suppressing generation of radicals by doping titanium dioxide with iron is also known, but this method could not solve the problem of coloring. That is, development of a means for suppressing the generation of new radicals of titanium dioxide has been desired.

On the other hand, in titanium dioxide containing 0.1 to 10% by weight of one or more elements selected from aluminum, zirconium, zinc, silicon and cerium, the presence thereof is uniform in the powder. A powder for a composition for external use on the skin which is characterized by a certain characteristic has not yet been known at all.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide means for suppressing the generation of new radicals of titanium dioxide.

[0006]

In view of such a situation, the present inventors have made intensive research efforts and found that one or more elements selected from aluminum, zirconium, zinc, silicon and cerium are reduced to zero. In titanium dioxide containing from 1 to 10% by weight, it is found that the powder of titanium dioxide is characterized by its presence being uniform in the powder and has such characteristics. Completed. less than,
A more detailed description will be given focusing on embodiments of the invention.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) Powder for the composition for external use of the skin of the present invention The powder for the composition for external use of the skin of the present invention is one or more selected from aluminum, zirconium, zinc, silicon and cerium. 0.1 to 10% by weight, preferably 0.5 to 7% by weight, more preferably 0.7 to 5% by weight of two or more elements
In the titanium dioxide contained, the titanium dioxide is characterized in that its presence is uniform in the powder. At this time, the form of these metals may exist as an oxide, may exist as an ion, or may exist as a metal. The powder of the present invention can be produced without any particular limitation on the production method as long as the finished powder satisfies the above-mentioned conditions. For example, it can be produced by calcining fine particles of titanium dioxide and fine particles of the metal salt or oxide at 300 to 1500 ° C., or water from a mixed aqueous solution of a water-soluble salt of the metal and a water-soluble salt of titanium. It can also be produced by generating a precipitate such as an oxide and firing it in the same manner. The powder of the present invention includes not only the powder itself obtained in this way, but also a powder obtained by subjecting these to surface treatment. As the surface treatment, coating with an inorganic powder such as silica or alumina, silicone treatment with hydrogen methyl polysiloxane or a silylating agent, fluoroalkylation treatment, coating treatment with a metal soap, coating treatment with an amino acid or a derivative thereof is preferable. Can be illustrated. The amounts of these treatments may be in accordance with ordinary ones, and for example, are preferably 0.1 to 10% by weight. The method of these processes may follow a known method. The powder of the present invention thus obtained is not only excellent in the action of absorbing ultraviolet rays, but also does not release the energy of the absorbed ultraviolet rays as radicals, so that oxidation reactions caused by radicals are extremely rare. This is because when electron spin resonance is measured after absorption of ultraviolet light, the amount of hydroxy radicals generated is less than half, and in many cases 10%, compared to conventional titanium dioxide.
It can be understood from the following.

(2) The composition for external use of the skin of the present invention The composition for external use of the skin of the present invention is a composition used for external use of the skin such as a cosmetic or a medicine for external use of the skin. It is characterized by containing. As the composition for external use on the skin of the present invention, cosmetics are preferred, and among them, cosmetics intended for protection from ultraviolet rays, summer cosmetics often exposed to ultraviolet rays, and the like are particularly preferred. This is because such a composition is suitable for exhibiting the characteristics of the powder of the present invention, which is hard to generate radicals even when absorbing ultraviolet light. The preferred content of the powder of the present invention in the composition for external use on skin of the present invention is 0.1 to 60% by weight, more preferably 0.5 to 20% by weight. This is because if the amount is too large, the degree of freedom of other components may be reduced, and too little coating may not be exhibited. In the composition of the present invention, in addition to these powders,
The optional components usually used in these compositions can be used. Examples of such optional components include hydrocarbons such as petrolatum and microcrystalline wax, esters such as jojoba oil and gay wax, triglycerides such as tallow, olive oil, higher alcohols such as cetanol and oleyl alcohol, and stearic acid. Fatty acids such as oleic acid, polyhydric alcohols such as glycerin and 1,3-butanediol, nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, ethanol, carbopol, etc. Preferred examples include a tackifier, a preservative, an ultraviolet absorber, an antioxidant, a pigment, and powders.

[0009]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but it goes without saying that the present invention is not limited to only these Examples.

Example 1 95 parts by weight of fine-particle titanium dioxide and 5 parts by weight of alumina were mixed, fired at 1000 ° C., and pulverized to obtain powder 1 as the powder of the present invention. While this product had the same ultraviolet cut effect as titanium dioxide, it was irradiated with ultraviolet light for 2 hours, and generated less than 5% of the hydroxyl radical in the ESR in the ESR.

Example 2 A mixture of 95 parts by weight of fine titanium dioxide and 5 parts by weight of zirconium oxide was mixed at 1000 ° C.
And then pulverized to obtain powder 2 which is the powder of the present invention. While this product had the same ultraviolet cut effect as titanium dioxide, it was irradiated with ultraviolet light for 2 hours, and generated less than 5% of the hydroxyl radical in the ESR in the ESR.

Example 3 95 parts by weight of fine particle titanium dioxide and 5 parts by weight of zinc oxide were mixed, fired at 1000 ° C., and then pulverized to obtain a powder 3 of the present invention. While this product had the same ultraviolet cut effect as titanium dioxide, it was irradiated with ultraviolet light for 2 hours, and generated less than 5% of the hydroxyl radical in the ESR in the ESR.

Example 4 95 parts by weight of fine particle titanium dioxide and 5 parts by weight of silica were mixed, calcined at 1000 ° C., and pulverized to obtain powder 4 which is the powder of the present invention. While this product had the same ultraviolet cut effect as titanium dioxide, it was irradiated with ultraviolet light for 2 hours, and generated less than 5% of the hydroxyl radical in the ESR in the ESR.

Example 5 95 parts by weight of fine-particle titanium dioxide and 5 parts by weight of cerium oxide were mixed, fired at 1000 ° C., and then pulverized to obtain powder 5, which is the powder of the present invention.
This product has the same UV-cutting effect as titanium dioxide, but has a low UV irradiation effect for 2 hours.
At R, hydroxyl radical generation was less than 5% of normal titanium dioxide.

Example 6 A mixture of 90 parts by weight of fine particle titanium dioxide, 5 parts by weight of alumina and 5 parts by weight of silica was mixed.
After sintering at 00 ° C., the mixture was pulverized to obtain powder 6 of the present invention. While this product had the same ultraviolet cut effect as titanium dioxide, it was irradiated with ultraviolet light for 2 hours, and generated less than 5% of the hydroxyl radical in the ESR in the ESR.

Example 7 97 parts by weight of powder 1 was added, 3 parts by weight of hydrogen methylpolysiloxane was added thereto, and the mixture was baked at 200 ° C. to obtain powder 7.

Example 8 97 parts by weight of powder 1 was added, 3 parts by weight of methoxyperfluoroalkyldimethylsilane was added, and the mixture was baked at 200 ° C. to obtain powder 8.

<Example 9> 97 parts by weight of powder 1 was coated with 3 parts by weight of zinc stearate to obtain powder 9.

Example 10 According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 1 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

<Example 11> According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 2 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

Example 12 According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 3 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

Example 13 According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 4 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

Example 14 According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 5 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

Example 15 According to the following formulation,
UV protective cosmetics were created. That is, after kneading the components of (a) well, diluting by adding (ii) and dispersing (c),
The mixture was heated to 80 ° C., and gradually added to 80 ° C. in advance, emulsified, stirred and cooled to obtain a foundation. A Glycerin 5 parts by weight 1,3-butanediol 5 parts by weight Triglycerin diisostearate 5 parts by weight Methyl paraben 0.3 parts by weight butyl paraben 0.1 parts by weight 70% malbite aqueous solution 5 parts by weight b Liquid paraffin 5 parts by weight Light Isoparaffin 5 parts by weight Octyl paradimethylaminobenzoate 5 parts by weight C Powder 6 12 parts by weight Talc 3 parts by weight D Water 49.6 parts by weight

Example 16 A summer foundation was obtained according to the following formulation. That is, after mixing A in a Henschel mixer, the mixture was pulverized with a pulverizer equipped with a 0.9 mm round hole screen, coated with B while stirring with a Henschel mixer, pulverized with a pulverizer equipped with a 1 mm herringbone screen, and plated with a metal plate. And pressed to obtain a summer foundation. B Powder 7 20 parts by weight Silicone treated sericite 30 parts by weight Silicone treated iron oxide 5 parts by weight Silicone treated mica 20 parts by weight Methylsiloxane network polymer 10 parts by weight Silicone treated titania sericite 5 parts by weight Lo octyldodecyl oleate 10 parts by weight Department

Example 17 A summer foundation was obtained according to the following formulation. That is, after mixing A in a Henschel mixer, the mixture was pulverized with a pulverizer equipped with a 0.9 mm round hole screen, coated with B while stirring with a Henschel mixer, pulverized with a pulverizer equipped with a 1 mm herringbone screen, and plated with a metal plate. And pressed to obtain a summer foundation. B Powder 8 20 parts by weight Silicone-treated sericite 30 parts by weight Silicone-treated iron oxide 5 parts by weight Silicone-treated mica 20 parts by weight Methylsiloxane network polymer 10 parts by weight Silicone-treated titania sericite 5 parts by weight Looctyl decyl oleate 10 parts by weight Department

Example 18 A summer foundation was obtained according to the following formulation. That is, after mixing A in a Henschel mixer, the mixture was pulverized with a pulverizer equipped with a 0.9 mm round hole screen, coated with B while stirring with a Henschel mixer, pulverized with a pulverizer equipped with a 1 mm herringbone screen, and plated with a metal plate. And pressed to obtain a summer foundation. A Powder 9 20 parts by weight Silicone-treated sericite 30 parts by weight Silicone-treated iron oxide 5 parts by weight Silicone-treated mica 20 parts by weight Methylsiloxane network polymer 10 parts by weight Silicone-treated titania sericite 5 parts by weight Looctyl decyl oleate 10 parts by weight Department

<Example 19> With respect to the ultraviolet protective material of Example 10, the ultraviolet protective effect was examined using five guinea pigs per group. That is, the back of a Hartley-type white guinea pig was shaved, and two 2 cm × 2 cm portions were formed, and the protective cosmetic of Example 10 was used on one side and the protective agent powder 1 of Example 10 on the other. Was replaced with ordinary titanium dioxide (Comparative Example 1), and 0.5 g of each was applied. This was irradiated with ultraviolet rays 10 times the minimum erythema concentration previously determined for each animal, and the skin reaction was determined 24 hours after irradiation according to Draize's criteria. As a result, in Example 10, all animals were-(no response), whereas in Comparative Example 1, 3 animals were ± and the remaining 2 animals were-. This indicates that the powder of the present invention and the external composition for skin containing the same are excellent. (Draise criteria)-: No response ±: Weak erythema +: Clear erythema ++: Response with edema

<Example 20> The summer foundation of Example 16 was examined for its ultraviolet protection effect using five guinea pigs per group. In other words, the back of a Hartley-based white guinea pig was shaved and two 2 cm x 2 cm parts were made.
On one side, the summer foundation of Example 16 was applied, and on the other side, 0.5 g of a powder obtained by replacing the summer foundation powder 7 of Example 16 with ordinary silicon-treated titanium dioxide (Comparative Example 2) was applied. . This was irradiated with ultraviolet rays 10 times the minimum erythema concentration previously determined for each animal, and the skin reaction was determined 24 hours after irradiation according to Draize's criteria. As a result, in Example 10, all animals were-(no response).
On the other hand, in Comparative Example 1, two animals were +, one animal was ±, and the remaining two animals were −. This indicates that the powder of the present invention and the external composition for skin containing the same are excellent.

[0030]

According to the present invention, it is possible to provide a means for suppressing the generation of new radicals of titanium dioxide.

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Claims (8)

[Claims] 1. A titanium dioxide containing 0.1 to 10% by weight of one or more elements selected from aluminum, zirconium, zinc, silicon and cerium,
A powder for an external composition for skin comprising titanium dioxide, characterized in that its presence is uniform in the powder. 2. The method according to claim 1, wherein in the measurement using an electron spin resonance apparatus, when ultraviolet irradiation is performed, the amount of generated hydroxyl radicals is suppressed as compared with titanium dioxide. A powder for the composition for external use on the skin according to the above. 3. The powder for a composition for external use on the skin according to claim 1, wherein the amount of generated hydroxyl radicals is 50% or less of titanium dioxide. 4. The powder for a composition for external use on the skin according to claim 1, wherein the composition for external use on the skin is a cosmetic. 5. A composition for summer use,
The powder for a skin external preparation according to any one of claims 1 to 4. 6. A composition for external use on the skin, comprising the powder according to any one of claims 1 to 5. 7. The composition for external use on skin according to claim 6, which is a cosmetic. 8. The method according to claim 6, characterized in that it is for summer use.
Or the composition for external use on skin according to 7.