JP3178950B2 - Powder for cosmetics and cosmetics containing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder for cosmetics and a cosmetic containing the same.

[0002]

2. Description of the Related Art In cosmetics, especially in make-up cosmetics, it has been an important technique to modify the surface of powders to be blended. This is because powders have a very large specific gravity compared to other cosmetic raw materials, and because the powders have an isoelectric point, slight environmental changes are preferred, such as aggregation and sedimentation. Because of the presence of a hydrophilic part and a lipophilic part on the surface of powders, ingredients in cosmetics even on cosmetics or skin,
There is a part that is not wet with sebum or sweat, these are wet with sebum or sweat after application, the color of application changes over time, and the powder itself has poor affinity with the skin, This is because it may be inconvenient when blending into cosmetics such as causing makeup collapse due to lack.

For this reason, conventional surface modification methods include:
For example, hydrophilic treatment by coating with an inorganic phosphate or the like, lipophilic treatment by coating with an oil component, hydrophobic treatment by baking of organic silicone, and the like are widely used.

[0004]

However, according to the conventional treatment method, the surface modifier is likely to fall off, failing to obtain the desired effect, or limiting the dosage form that can be stably compounded. It was hard to say that it was not enough because the physical properties of

In addition, since powders easily absorb lipids and moisture on the skin, applying a foundation or the like has a drawback that the skin becomes bulky, which has been a major problem in use.

The present invention has been made in view of the above circumstances, and provides a surface-modified powder which is not easily desorbed, has excellent durability of a modifying effect, and has excellent moisture retention, and a cosmetic containing the same. With the goal.

[0007]

Since the present inventors SUMMARY OF THE INVENTION, to attain the aforementioned object, the results of extensive studies, 2 Metaku Li b <br/> yl oxyethyl phosphorylcholine (hereinafter referred to as "MPC") By coating the powder with a homopolymer and a copolymer, it is possible to perform surface modification with excellent durability, improve the dispersibility and surface wetting characteristics of the powder, and significantly improve the moisture retention. Heading, completed the invention.

That is, the powder for cosmetics according to the present invention contains M
It is characterized in that powders are coated with a polymer obtained by polymerizing PC as one of the monomers.

Furthermore, the cosmetic of the present invention is characterized in that it contains a powder for cosmetic coated with a polymer obtained by polymerizing MPC as one of the monomers.

Hereinafter, the present invention will be described in detail.

The cosmetic powder of the present invention is a powder whose surface is coated with a polymer having MPC as a structural unit represented by the following general formula (1).

MPC has the same structure as the polar group of phospholipid (phosphatidylcholine), which is the main component of the biological membrane, and has good affinity with the living body. In addition, MPC can be derived into either a hydrophilic polymer or a lipophilic polymer by copolymerizing in combination with a hydrophilic monomer or a hydrophobic monomer. Therefore, when the powder is coated with these polymers,
In the case of a hydrophilic polymer, a hydrophilic treatment can be performed, and in the case of a lipophilic polymer, a lipophilic treatment can be performed. As described above, by changing the types and constitutional ratios of the monomers constituting the copolymer, various treatments according to the intended use can be performed.

[0013]

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Moreover, since both homopolymers and copolymers of these MPCs are excellent in lamellar forming ability, they are excellent in taking water into the lamellar structure and retaining water, improving the degreasing and dehydrating effects of powders, It also has the effect of eliminating the feeling of bulkiness.

For such MPC, for example, 2-bromoethyl phosphoryl dichloride, 2-hydroxyethyl phosphoryl dichloride and 2-hydroxyethyl methacrylate are reacted to obtain 2-methacryloyloxyethyl-2'-bromoethyl phosphoric acid. This can be obtained by reacting it with triethylamine in a methanol solution (Polymer Transactions, Vol. 35, pp. 423-42).
7, 1978).

Both homopolymers and copolymers of MPC are known substances (Japanese Patent Application Nos. 4-306751, 4-306675, 3-233259, and 5-703221). Japanese Patent Application Laid-Open No. H10-209, pp. 1 to 3), which has excellent water retention and lamellar forming action.

In order to form a polymer by polymerizing MPC alone or together with other monomers, the polymerization may be carried out according to a usual polymerization method. For example, the reaction may be carried out in a solvent in the presence of a polymerization initiator. You can do it. At this time, those that can be used as a solvent are those that can dissolve MPC and other monomers, and specifically, water, methanol, ethanol,
Propanol, t-butanol, benzene, toluene,
Examples include dimethylformamide, tetrahydrofuran, chloroform or a mixed solvent thereof. As the polymerization initiator, any ordinary radical initiator may be used, and fatty acid azo compounds such as 2,2'-azobisisobutyronitrile (AIBN) and azobismalenonitrile and peroxides may be used. Examples include peroxides such as benzoyl, lauroyl peroxide, potassium persulfate and the like.

When a copolymer is formed from MPC and another monomer, any monomer that can be used may be any as long as it forms a copolymer by MPC and vinyl polymerization. For example, acrylamide, vinylpyrrolidone, polyethylene glycol monomethacrylate, 2-methacryloyloxyethylmethylsulfoxide, acrylic acid, methacrylic acid, acrylamide-2-methyl-propanesulfonic acid, P-styrenesulfonic acid, 3-methacrylic acid
Liloyloxypropyl sulfonic acid, N, N-dimethylaminoethyl methacrylate, N, N-diethylaminoethyl methacrylate, vinylpyridine and the like can be exemplified. Further, as the hydrophobic monomer, for example, methyl acrylate, methyl methacrylate, ethyl acrylate,
Examples thereof include acrylates and methacrylates such as ethyl methacrylate, styrene, vinyl chloride, and acrylonitrile.

The powders coated with the homopolymers and copolymers of MPC are not particularly limited as long as they are used in cosmetics. For example, talc, sericite, mica, titanium mica, titanium , Red iron oxide, yellow iron oxide,
Examples include black iron oxide, titanium oxide, chromium oxide, silica gel, calcium silicate, ultramarine, navy blue, and the like.

As a method for coating these powders with the above-mentioned polymer, a conventional coating method can be used. For example, after the powder and the polymer are mixed well with a Henschel mixer, it can be mechanochemically coated with a pulverizer, or the polymer is dissolved in a soluble solvent,
This can be applied to the powder to remove the solvent and coat the powder.

At this time, the polymerization degree of the polymer used is 5000
It is desirable that this is the case. This is because if the degree of polymerization is low, the adhesion becomes low, and the expected effect cannot be obtained.

The weight ratio of the polymer to the powder when the powder is coated is preferably 1 to 50%. This is because if the weight ratio is less than 1%, the powder cannot be coated and a sufficient modifying effect cannot be obtained, and if it exceeds 50%, the characteristics of the powder are impaired, which is both undesirable.

The powder coated with the MPC polymer thus obtained is excellent in dispersibility in oil and water, and has little change in water and oil wetness. Since the change in color after application with time is reduced and the adhesiveness to the skin is excellent, physical loss is reduced, and it is very useful when used as a powder for cosmetics.

[0024]

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

Example 1 (Production of toning powder coated with MPC homopolymer)
Were weighed with a Henschel mixer, mixed at high speed for 2 minutes, and then pulverized and mixed with a pulverizer equipped with a 1 mm round-hole screen to prepare an MPC homopolymer-coated toned powder.

[0026]

[Table 1]

Example 2 (Production of toning powder coated with MPC homopolymer)
Weighed into a Henschel mixer, mixed at high speed for 2 minutes, then mixed at low speed for 10 minutes while spraying component B dissolved in chloroform, dried at 40 ° C. for 24 hours, dried 1 day herringbone. The powder was pulverized with a screen device pulverizer to prepare an MPC homopolymer-coated powder.

[0028]

[Table 2]

Example 3 (Production of powder coated with MPC-vinylpyrrolidone copolymer)
A component shown in the following "Table 3" is weighed into a Henschel mixer, mixed at high speed for 2 minutes, and then mixed at low speed while spraying B component dissolved in chloroform.
After drying day and night, the mixture was pulverized with a pulverizer equipped with a 0.7 mm herringbone screen to prepare an MPC-vinylpyrrolidone copolymer-coated powder.

[0030]

[Table 3]

Example 4 (Production of powder coated with MPC-p-styrene sulfonic acid copolymer) The components shown in Table 4 below were weighed into a Henschel mixer, mixed at high speed for 3 minutes, and then mixed with a 1 mm round hole screen. Crushed and coated with a pulverizer equipped with
-A powder coated with a p-styrenesulfonic acid copolymer was prepared.

[0032]

[Table 4]

Example 5 (Production of toning powder coated with MPC-N, N-diethylaminoethyl methacrylate copolymer) The components shown in Table 5 below were weighed into a Henschel mixer and mixed at high speed for 2 minutes. The mixture was pulverized and mixed with a pulverizer equipped with a 1 mm round hole screen to prepare a toning powder coated with an MPC-N, N-diethylaminoethyl methacrylate copolymer.

[0034]

[Table 5]

Example 6 (Production of Toning Powder Coated with MPC-Styrene Copolymer) Component A shown in Table 6 below was weighed into a Henschel mixer, mixed at high speed for 2 minutes, and then chlorided at low speed. Mix the B component dissolved in methylene for 10 minutes while spraying,
It was dried at 40 ° C. for one day and night, and pulverized with a pulverizer equipped with a 0.7 mm herringbone screen to prepare an MPC-styrene copolymer-coated powder.

[0036]

[Table 6]

Example 7 (Production of Toning Powder Coated with MPC-Methyl Methacrylate Copolymer) Ingredient A shown in Table 7 below was weighed into a Henschel mixer, mixed at high speed for 2 minutes, and rotated at low speed. And dropped
The B component dissolved in methylene chloride was mixed for 10 minutes while spraying. After drying at 40 ° C. for one day and night, it was pulverized with a pulverizer equipped with a 1 mm herringbone screen to produce a powder coated with MPC-methyl methacrylate copolymer.

[0038]

[Table 7]

Examples 8 to 10 (Examples of Formulation in Cosmetics) A foundation containing the polymer-treated powder of the present invention was prepared according to the formulation shown in Table 8 below. As a comparative example, the MPC homopolymer in the powder of Example 2 was replaced with talc, mixed with a Henschel mixer, and mixed with a comparative toning powder prepared by pulverizing with a 0.7 mm herringbone screen-mounted pulverizer. Also created.

The production method is the same as that of the usual foundation. The components A and C shown in Table 8 below are dissolved by heating at 80 ° C. in advance, and the component B is added to the component A, and the mixture is mixed with a mixer. After mixing, the C component was gradually added thereto and emulsified, followed by stirring and cooling to obtain a foundation.

When the emulsion thus obtained was observed for an emulsified state and a dispersed state with an optical microscope, the results shown in Table 9 below were obtained. In addition, the evaluation marks ◎: very good, ：: good, Δ: slightly poor, ×: bad. From these results, the treated powder of the present invention,
All of them are excellent in dispersibility, and it is clear that this has a good effect on emulsification.

[0042]

[Table 8]

[0043]

[Table 9]

Example 11 The makeup effects of the foundations of Examples 8 to 9 and Comparative Example were evaluated using five specialized panelists. The evaluation items were a total of four items of “moist feeling”, “appearance of makeup”, “adhesion” as evaluation immediately after makeup, and “makeup lasting” as evaluation after 5 hours of makeup. The evaluation method was performed by applying the foundation of the example to the right half face, applying the foundation of the comparative example to the left half face, and comparing with the comparative example.

The results are shown in Table 10 below. It is clear from this that the foundations of Examples 8 to 10 of the present invention all have excellent cosmetic effects. This is because the treating agent is not separated from the powder during the emulsification process, so that the treating effect is exhibited.

Further, when looking at the moist feeling, it should be noted that both Examples 8 to 10 are remarkably improved as compared with Comparative Examples. This is because both copolymers have excellent moisturizing properties, and the effects of powder treatment with these are clear.

[0047]

[Table 10]

Examples 12 to 18 Using the treated powder of the present invention of Examples 1 to 7 and the comparative toning powder described above, solid pastes of Examples 12 to 18 and Comparative Example 2 were prepared. did. Each component is shown in Table 11 below.
The preparation was performed by mixing the component A in Table 11 below with a Henschel mixer for 2 minutes, then dropping the component B dropwise with continued stirring and mixing, and mixing for 5 minutes after completion of the dropping, followed by 1 mm herringbone screen. This was crushed with a pulverizer equipped with a crusher, placed in a metal plate, and then pressed.

[0049]

[Table 11]

Example 19 Using the solid pastes of Examples 12 to 18 and Comparative Example 2,
In the same manner as in Example 11, the evaluation of the cosmetic effect was performed by a specialized panelist. The results are shown in Table 12 below. It is clear from this that the solid paste of the present invention has an excellent cosmetic effect.

[0051]

[Table 12]

Further, in these examples, a remarkable improvement in the moist feeling was observed, and the improvement of the dry feeling due to the water retaining function of the MPC homopolymer and copolymer of the present invention is apparent.

[0053]

As described above, according to the present invention, according to the present invention, the MPC homopolymer and copolymer modify the surface of the powder and have good durability. Cosmetics containing those obtained by coating powders with a copolymer are very useful, for example, because they have remarkably improved moisturizing properties and excellent cosmetic effects.

Continued on front page (72) Inventor Hideo Kuroda 560 Paula-cho, Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Totsuka Laboratories Co., Ltd. (72) Inventor Norio Nakabayashi 5-6-20 Koganehara, Matsudo City, Chiba Prefecture (56) References JP-A-60-184571 (JP, A) JP-A-5-70321 (JP, A) JP-A-3-39309 (JP, A) JP-A-54-63025 (JP, A) JP-A-6-157269 (JP, A) JP-A-6-157270 (JP, A) JP-A-6-157271 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K ⁷ /00-7/035 A61K 7/48 C09C 3/10

Claims (11)

(57) [Claims] 1. A 2-Metaku re acryloyloxyethyl phosphorylcholine as one of monomers, a powder for cosmetic characterized by comprising coated particulate materials in polymer obtained by polymerizing. 2. The powder for cosmetics according to claim 1, wherein the molecular weight of the polymer is 5,000 or more. 3. The cosmetic powder according to claim 1, wherein the weight ratio of the polymer to the powder to be coated is 1% to 50%. 4. A structure of the monomer, 2-Metaku Li acryloyloxyethyl phosphorylcholine powder cosmetic composition according to claim 1-3, wherein it is only one. 5. The structure of the monomer, claim 1, characterized in that 2-Metaku Li acryloyloxyethyl phosphorylcholine and one or more selected from hydrophobic monomers
A powder for cosmetics according to any one of claims 1 to 3. 6. The powder for cosmetics according to claim 5, wherein the hydrophobic monomers are styrene, acrylate and methacrylate. 7. A in the polymer, the composition ratio of 2 Metaku Li b <br/> yl oxyethyl phosphorylcholine and hydrophobic monomer as a monomer is 3: 97-45: characterized in that it is a 55 The powder for cosmetics according to claim 5. Configuration of 8. monomer, of claims 1 to 3, wherein a is 2 Metaku one or more selected from a Li acryloyloxyethyl phosphorylcholine and hydrophilic monomers Powder for cosmetics. 9. The method according to claim 9, wherein the hydrophilic monomers are acrylamide, vinylpyrrolidone, polyethylene glycol monomethacrylate, 2-methacryloyloxyethylsulfoxide, acrylic acid, methacrylic acid, acrylamide-2-.
Methyl - propane sulfonic acid, p- styrenesulfonic acid, 3-Metaku Li acryloyloxy propyl acid,
N, N-dimethylaminoethyl methacrylate, N, N
The powder for cosmetics according to claim 8, which is -diethylaminoethyl methacrylate or vinylpyridine. 10. In the polymer, 2-methacrylic acid is used as a monomer.
Li acryloyloxyethyl phosphorylcholine structure ratio of choline and a hydrophilic monomers is 3: 97-45: 55 of claim 9 or 10 powder cosmetic composition, wherein it is. 11. A cosmetic comprising the cosmetic powder according to claim 1. Description: