JP5222463B2 - Cosmetic composition - Google Patents

Description

  The present invention relates to a cosmetic composition, and more particularly to a cosmetic composition for removing old keratin and maintaining skin health.

  So far, many compositions for maintaining skin health have been proposed. For example, as a cleansing agent having an old keratin exfoliation promoting effect, a keratin exfoliating cleansing agent (Patent Document 1) containing a polyalkylene glycol and an anionic surfactant and further containing a fatty acid or a salt in a granular form, and a surfactant A skin cleaning composition (Patent Document 2) containing polysaccharide powder or agar has been proposed. Moreover, as a friction type skin external preparation, the composition (patent document 3) containing 1 type, or 2 or more types of the solid of silicon dioxide, a plant seed ground material, and a crystalline cellulose is an example of the composition containing inorganic powder. Has proposed a cleaning material (Patent Document 4) mainly composed of talc, kaolin, various micas, magnesium carbonate and the like.

However, the composition containing the solid powder proposed in Patent Documents 1, 3, and 4 has a problem in terms of the shape of the solid powder. For example, in the case of powders of inorganic or fatty acid salts, since the crystal form is fine or the crystal itself, the surface is generally sharp at an acute angle. In the case of pulverized plant seeds, the surface of the particles is crushed with protrusions. Therefore, none of these powders has a smooth surface. Therefore, in the compositions proposed in Patent Documents 1, 3, and 4, when applied to the skin and rubbed, the powder is damaged against sensitive skin cells. There is a risk of giving. Moreover, in the composition proposed in Patent Document 2, soft agar is added, and it is considered that the efficiency is low in order to peel off the hard keratin.
JP 2004-277295 A JP 2003-342162 A JP 2003-81881 A JP-A-8-67622

  In view of the above circumstances, the problem to be solved by the present invention is to provide a cosmetic composition capable of efficiently removing old keratin and dirt even though there is little skin irritation.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have sufficiently high exfoliation by rubbing the composition obtained by dispersing volcanic ejecta foam in a polymer compound against the skin. It has been found that it has a promoting action and is less irritating to the skin, and the present invention has been completed.

That is, the present invention is as follows.
(1) A cosmetic composition in which a foam of a volcanic ejecta is dispersed in a polymer compound to form a solid, gel or cream.
(2) The volcanic ejecta foam is one or more of shirasu foam, obsidian foam, and pearlite foam, and the average particle diameter is 30 μm or less (1 ) Cosmetic composition.
(3) The cosmetic composition according to the above (1) or (2), wherein the polymer compound comprises polyvinyl alcohol and at least one selected from polyethylene glycol, methylcellulose, carboxymethylcellulose and beeswax.
(4) The cosmetic composition according to (1), wherein the volcanic ejecta foam is a shirasu foam, the polymer compound contains polyvinyl alcohol and polyethylene glycol, and the composition is solid.
(5) The cosmetic composition according to (1), wherein the volcanic ejecta foam is a shirasu foam, the polymer compound contains polyvinyl alcohol and beeswax, and the composition is in a gel or cream form.

  According to the present invention, there is less irritation to the skin, the removal efficiency of old keratin is excellent, the cleaning ability is also good, and further, the release of high negative ions and the skin massage effect due to the far infrared effect are combined. A highly functional cosmetic composition can be provided.

Hereinafter, the present invention will be described in more detail.
The cosmetic composition of the present invention is a composition obtained by dispersing a volcanic ejecta foam in a polymer compound to form a solid, gel or cream.

  Here, “solid” means an elastic solid, “gel” means an elastic soft solid, and “cream” means an irregular paste.

  The volcanic ejecta foam used in the present invention means a foam produced by firing a powder of volcanic ejecta such as shirasu, obsidian, and pearlite. The foam is known, for example, a fired foam of Shirasu is known as Shirasu balloon, and a fired foam of obsidian or / and nacre is known as perlite.

These fired foams (hereinafter also simply referred to as “foams”) are powders (fine particles) mainly composed of spherical particles. Further, the fired foam of Shirasu exhibits a high negative ion release property (about 14,000 pieces / cm ³ ) and a high far-infrared emission property. FIG. 1 is an ion counter measurement graph showing the amount of negative ions released from a shirasu foam.

  In the present invention, the volcanic ejecta foam preferably has an average particle size of 30 μm or less, and more preferably an average particle size of 15 μm or less. In addition, when the average particle diameter is too small, irritation to the skin by the foamed particles tends to be too strong, and thus the average particle diameter is preferably 5 μm or more.

Here, the “average particle size” is a value measured by the following method (sieving method).
5 to 10 stages of standard sieves are mounted on an electromagnetic sieve shaker (manufactured by Inoue Seieido Co., Ltd.), and the sample is classified by shaking and the weight ratio of each particle section is measured. That is, the standard sieves are stacked one on top of the other with a large mesh opening, and 20 g of the sample is placed in the upper stage, shaken for 15 minutes, the weight of the sample for each mesh is measured, and the particle size distribution is obtained.
Next, calculate the ratio (wt%) of the particles screened for each mesh to the entire sample, add the ratio (wt%) for each mesh from the top, and calculate the numerical value before exceeding 50%. [D], the numerical value exceeding 50% is [e], and the under value (μm) of the mesh not exceeding 50% is [a]. Then, a mesh exceeding 50% is specified, and the weight average particle diameter is obtained from the following formula (I), with the over value (μm) of the mesh being [b] and the under value being [c].
Average particle diameter (μm) = a − [(bc) × {(50−d) / e}] (I)

  In the present invention, the volcanic ejecta foam may be used alone or in combination of two or more. In addition, when it is a 2 or more types of mixture, the said average particle diameter is an average particle diameter of a mixture.

  Shirasu, obsidian and nacreite powders themselves can also be used as cosmetic powders, but the surface of these powders is not smooth. On the other hand, since the volcanic ejecta foam is a powder (powder) mainly composed of spherical particles, it has a smooth surface, and exhibits a high negative ion emission property and a far infrared ray emission property. Although the composition of the present invention does not feel irritation even when it comes into contact with the skin and rubs, it has a high keratin removal efficiency and a high massage effect.

  As the polymer compound used in the present invention, a known polymer compound used as a base component of cosmetics can be used, but at least polyvinyl alcohol is preferably used, and polyvinyl alcohol, polyethylene glycol, methylcellulose, carboxy In a particularly preferred embodiment, at least one selected from methylcellulose and beeswax is used in combination.

  Polyvinyl alcohol is obtained by saponifying polyvinyl acetate, and its viscosity changes depending on the degree of polymerization and saponification. As described above, the preferred form of the cosmetic composition of the present invention is a solid, gel or cream, and in order to make the composition into such a preferred form, the saponification degree of polyvinyl alcohol is 90 to 99.4 mol. % Is preferred. In particular, when a solid composition is used, the saponification degree is more preferably 98 to 99 mol%. When the saponification degree is less than 90 mol%, it becomes difficult to keep the composition in a solid to gel state. On the other hand, if the degree of saponification exceeds 99.4 mol%, it is difficult to expose the volcanic ejecta foam on the surface of the composition (particularly the solid composition), which is not preferable. In addition, since the commercial item of polyvinyl alcohol is powder, it uses it as aqueous solution.

  Methyl cellulose and carboxymethyl cellulose, which are naturally derived polymer compounds, are used in an aqueous solution, and these are mixed with the above-mentioned polyvinyl alcohol aqueous solution and added with a volcanic ejecta foam to disperse the solid, gel or A creamy composition can be easily prepared.

  Polyethylene glycol is mainly used for improving the moisture retention function and adjusting the viscosity of the composition. The average molecular weight is preferably 500-1500, and more preferably 900-1100. When the average molecular weight is less than 500, the viscosity of the composition is lowered, and the moisturizing component tends to be excessively emitted from the composition (particularly, the solid composition). When the average molecular weight is 1500 or more, the viscosity becomes too high. In particular, the moisturizing function of the solid composition) tends to decrease, which is not preferable.

  In addition, beeswax is mainly used for improving the moisturizing function of the composition, and is particularly blended in a gel or cream composition.

  In addition to the above-described polymer compound, the composition of the present invention includes, as a moisturizing agent, polyhydric alcohols such as glycerol, xylitol, propylene glycol and maltitol, amino acids such as aspartic acid, glycine and glutamic acid, and mucos such as hyaluronic acid. A polysaccharide etc. can be mix | blended. The amount of the humectant is about 5 to 10% by weight based on the entire composition.

  In the composition of the present invention, the form of the composition can be changed from solid to gel by adding a surfactant. As the surfactant, an anionic surfactant, a cationic surfactant, a nonionic surfactant and an amphoteric surfactant can be used. Examples of the anionic surfactant include sodium laurate and sodium lauryl sulfate. Examples of the cationic surfactant include stearyltrimethylammonium chloride, examples of the nonionic surfactant include sorbitan monooleate, and examples of the amphoteric surfactant include various betaine compounds. It is done. The compounding quantity of this surfactant is about 3 to 5 weight% with respect to the whole composition.

  Moreover, a preservative can be mix | blended with the composition of this invention. The long-term stability of the cosmetic composition of the present invention is improved by blending the preservative. Examples of such preservatives include sorbic acid and citric acid. The amount of the preservative is about 1 to 2% by weight based on the whole composition.

  As described above, the cosmetic composition of the present invention is preferably in the form of a solid, gel, or cream, but the preferred production method for the composition of each form will be described below.

(I) Manufacturing method of solid cosmetic composition First, an aqueous polyvinyl alcohol solution is prepared (step 1).
The aqueous polyvinyl alcohol solution can be prepared, for example, by adding polyvinyl alcohol powder to purified water and heating it to 70 to 80 ° C. with slow stirring to completely dissolve it. The concentration of polyvinyl alcohol is preferably 5 to 30% by weight. If the concentration is less than 5%, the composition cannot be maintained in a solid state. If the concentration exceeds 30%, the composition is too hard to be used.

  Next, polyethylene glycol is mixed in the polyvinyl alcohol aqueous solution prepared above (step 2). Specifically, polyethylene glycol is added and kneaded while heating the polyvinyl alcohol aqueous solution at 70 to 80 ° C. to make it uniform. As for polyethyleneglycol, 5-30 weight part is preferable with respect to 100 weight part of polyvinyl alcohol aqueous solution. When the polyethylene glycol is less than 5 parts by weight, the resulting composition tends to be unsmooth, and when it exceeds 30 parts by weight, the solid matter becomes hard and the skin irritation tends to be too strong. Therefore, it is not preferable.

  Next, the volcanic ejecta foam is added while heating the mixed solution prepared above to 70 to 80 ° C., and kneaded until uniformly dispersed (step 3). As for the volcanic ejecta foam to add, 3-30 weight part is preferable with respect to 100 weight part of the said liquid mixture. When the amount is less than 3 parts by weight, the resulting composition is difficult to obtain a sufficiently high effect of removing keratin and dirt, and when it exceeds 30 parts by weight, the skin irritation by the composition tends to be too strong. Therefore, it is not preferable.

Finally, the kneaded material obtained in the above step 3 is poured into a desired mold and solidified (step 4). This solidification is allowed to stand naturally or refrigerated at 5 to 10 ° C., followed by ventilation drying with warm air.
Through the above steps 1 to 4, the solid cosmetic composition of the present invention can be produced.

(B) Method for producing gel cosmetic composition First, an aqueous polyvinyl alcohol solution is prepared by the method described in (a) above (step 1).
Next, 1 to 5 parts by weight of beeswax is added to 100 parts by weight of an aqueous polyvinyl alcohol solution heated to 70 to 80 ° C. and kneaded until uniform (step 2).
Next, 10-50 parts by weight of volcanic ejecta foam is added to 100 parts by weight of the kneaded product (step 3). When the amount is less than 10 parts by weight, the resulting composition is difficult to obtain a sufficiently high removal effect of keratin and dirt, and when it exceeds 50 parts by weight, the skin irritation by the composition tends to be too strong. Therefore, it is not preferable.

Finally, the composition obtained in the above step is injected into a desired mold and gelled (step 4). This gelation is carried out by allowing to stand naturally or by refrigeration at 5 to 10 ° C.
The gel cosmetic composition of the present invention can be produced by the above steps 1 to 4.

(C) Production method of creamy cosmetic composition First, an aqueous polyvinyl alcohol solution is prepared by the method described in (a) (step 1).
Next, 1 to 5 parts by weight of beeswax is added to 100 parts by weight of an aqueous polyvinyl alcohol solution heated to 70 to 80 ° C. and kneaded until uniform (step 2).
Finally, 10-50 parts by weight of the volcanic ejecta foam is added to 100 parts by weight of the kneaded product (step 3). The composition thus obtained is in the form of a cream.
The creamy cosmetic composition of the present invention can be produced by the above steps 1 to 3.

  In the preparation of the composition of the present invention, the temperature is set to 70 to 80 ° C. when the volcanic ejecta foam is dispersed in the polymer compound aqueous solution, as shown in the production examples (a) to (c) above. It is preferable to do this.

EXAMPLES The present invention is specifically illustrated below by examples, but the present invention is not limited to the following examples.
Example 1
1000 g of purified water was transferred to a 5 liter stainless steel container, 200 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70 to 80 ° C., 200 g of polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd.) was added. Next, with stirring, 200 g of shirasu foam (Shirasu balloon: average particle size 13 μm, manufactured by Nao Fuwawa Co., Ltd.) was added and kneaded until a uniform mixture was obtained. The composition was poured into a cylindrical container having a diameter of 7 cm and a depth of 3 cm and allowed to stand for 24 hours. Then, the composition was taken out of the container, transferred to a blower dryer, and then dried with hot air at 50 ° C. for 5 hours. A solid cosmetic composition of the present invention was obtained.

( Reference Example 2)
1000 g of purified water was transferred to a 5 liter stainless steel container, 200 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70-80 ° C., 20 g of beeswax (manufactured by Miki Chemical Industry) was added. Next, with stirring, 200 g of shirasu foam (Shirasu balloon: average particle size 13 μm, produced by Howa Naoshi Co., Ltd.) was added and kneaded until a uniform mixture was obtained. The composition was poured into a cylindrical container having a diameter of 7 cm and a depth of 3 cm and allowed to stand for 24 hours. Then, the composition was taken out of the container, transferred to a blower dryer, and then dried with hot air at 50 ° C. for 5 hours . to obtain a gel-like cosmetic composition.

( Reference Example 3)
1000 g of purified water was transferred to a 5 liter stainless steel container, 200 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70-80 ° C., 50 g of beeswax (Miki Chemical Industries) was added. Next, with stirring, 200 g of shirasu foam (Shirasu balloon: average particle size 13 μm, manufactured by Nao Fuwawa Co., Ltd.) was added and kneaded until a uniform mixture was obtained. By allowing to cool, to obtain a click stream form of the cosmetic composition.

(Comparative Example 1)
500 g of purified water was transferred to a 5 liter stainless steel container, 100 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70 to 80 ° C., 100 g of polyethylene glycol (Daiichi Kogyo Seiyaku Co., Ltd.) was added. Next, while stirring, 100 g of shirasu (average particle size 15 μm, manufactured by Towa Naoshi Co., Ltd.) was added and stirred until a uniform mixture was obtained. The composition was poured into a cylindrical container having a diameter of 7 cm and a depth of 3 cm and allowed to stand for 24 hours. Then, the composition was taken out of the container, transferred to a blower dryer, and then dried with hot air at 50 ° C. for 5 hours. A solid composition was obtained.

(Comparative Example 2)
500 g of purified water was transferred to a 5 liter stainless steel container, 100 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70 to 80 ° C., 10 g of beeswax (manufactured by Miki Chemical Industry) was added. Next, with stirring, 100 g of shirasu (average particle size 15 μm, manufactured by Towa Naoshi Co., Ltd.) was added and kneaded until a uniform mixture was obtained. The composition was poured into a cylindrical container having a diameter of 7 cm and a depth of 3 cm and allowed to stand for 24 hours. Then, the composition was taken out of the container, transferred to a blower dryer, and then dried with hot air at 50 ° C. for 5 hours. A gel-like composition was obtained.

(Comparative Example 3)
500 g of purified water was transferred to a 5 liter stainless steel container, 100 g of polyvinyl alcohol (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) was added thereto, and the temperature was raised while stirring. After confirming complete dissolution at 70 to 80 ° C., 25 g of beeswax (manufactured by Miki Chemical Industry) was added. Next, with stirring, 100 g of shirasu (average particle size 15 μm, manufactured by Towa Naoshi Co., Ltd.) was added and kneaded until a uniform mixture was obtained. After cooling, a creamy composition was obtained.

(Evaluation test)
The skin improvement and massage effect were evaluated by 10 monitors per test.
The solid cosmetic composition of Example 1 was tested for keratin and elbow exfoliation for hard keratin (Table 1). The gel cosmetic composition of Reference Example 2 was tested for the purpose of removing old keratin of the face by washing the face (Table 2). In addition, the creamy cosmetic composition of Reference Example 3 was examined for scalp massage and body massage effects (Table 3).
Evaluation criteria were 6 or more people who were improved or effective, ◯, 3 to 5 people, and 2 or less people ×.
The test results are shown below.

As Tables 1-3 showed, it turned out that the cosmetic composition of this invention is excellent in the improvement effect of a skin, and the massage effect. In particular, the solid cosmetic composition efficiently removed old stratum corneum from the thick stratum corneum of elbows, knees, and heels, and changed it into a smooth skin state. Moreover, by using a gel-like composition, it turned into smooth skin, the oiliness was improved, and the riding of makeup became good. Moreover, it turned out that a cream-like composition exhibits a massage effect with respect to a scalp and a body.
In addition, although there is no skin damage in all monitors and there is no skin irritation, there is a massage effect that seems to be due to the release of negative ions and the far-infrared effect, and the moisturizing effect of the skin persists after use. Something was recognized.

The ion counter measurement graph which shows the discharge | release amount of the negative ion of a shirasu foam.

Claims (3)

A cosmetic composition in which a shirasu foam having an average particle diameter of 5 to 15 μm is dispersed in a polymer compound containing polyvinyl alcohol and polyethylene glycol having a saponification degree of 90 to 99.4 mol% to form a solid. The cosmetic composition according to claim 1, wherein the polyethylene glycol is a polyethylene glycol having an average molecular weight of 500 to 1500. 5 to 30 parts by weight of polyethylene glycol is added to 100 parts by weight of an aqueous polyvinyl alcohol solution having a polyvinyl alcohol concentration of 5 to 30% by weight and kneaded, and the resulting mixture is heated to 70 to 80 ° C. Add 3 to 30 parts by weight of shirasu foam having an average particle size of 5 to 15 μm or less to 100 parts by weight of the mixed solution, knead, and inject the obtained kneaded product into a desired mold to solidify it. The cosmetic composition according to claim 1 or 2, wherein the cosmetic composition is obtained.