JP3237078B2 - Flaky coated particles and cosmetic composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a flaky coated particle and a cosmetic composition, and more particularly to a flaky coated particle and a cosmetic composition having excellent ultraviolet shielding properties.

[0002]

BACKGROUND OF THE INVENTION Titanium oxide is blended in various compositions as a pigment, a filler and the like because of its high refractive index and excellent ultraviolet shielding properties.

[0003] In particular, by blending particulate titanium oxide having a particle diameter of 0.03 µm or less into cosmetics,
In particular, it is expected to provide cosmetics that are excellent in ultraviolet shielding properties and that can be applied to a natural finish with no whitening.

However, fine-grained titanium oxide has a large surface area, a large van der Waals force, and a high surface activity. Therefore, when it is incorporated into a cosmetic, it tends to aggregate in the cosmetic. In particular, when blended in powder cosmetics, since a small amount of oil is blended as a binder in the cosmetics, there is a strong tendency for ultrafine titanium oxide to aggregate in the cosmetics.

[0005] For this reason, cosmetics using moderately particulate titanium oxide cannot provide an expected ultraviolet shielding effect. Therefore, when a larger amount of fine-grained titanium oxide is added to the cosmetic, the fine-grained titanium oxide aggregates and turns pale, the ultraviolet ray shielding effect does not increase, and the spreadability of the cosmetic decreases. As a result, when the cosmetic is formulated with a cosmetic containing a large amount of fine particulate titanium oxide, the feeling of touch such as weight, spreadability, and creaking decreases, and the cosmetic finish such as adhesion and uniformity deteriorates.

In Japanese Patent Publication No. 6-55663,
Cosmetics containing kaolin particles coated with titanium oxide have been proposed. However, cosmetics containing plate-like particles coated with titanium oxide, for example, kaolin, mica, etc., have a small amount of these coated plate-like particles, so that the skin cannot be sufficiently covered with the coated plate-like particles. Poor shielding effect.

Conversely, when a large amount of the coated platelet particles is blended with the cosmetic, the coated platelet particles are generally thicker than 0.2 μm, and thus are larger than the fine particle titanium oxide particles. Because of its strong hiding power, when it is applied with cosmetics, it becomes white and unnatural.

Further, Japanese Patent Application Laid-Open No. 63-27418 proposes a cosmetic composition comprising coated particles obtained by coating the surface of a sheet-like sericite having a thickness of 0.005 to 0.1 μm with titanium oxide. Have been.

However, according to the study of the present inventors, this cosmetic is insufficient in terms of spreadability and feel,
In addition, since the coating amount of titanium oxide contained in the coated particles is less than 80% by weight, the ultraviolet ray shielding effect is insufficient.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a natural finish that is excellent in ultraviolet shielding properties, spreadability and feel, and does not appear white by being added to cosmetics. It is an object of the present invention to provide a particle coated with titanium oxide capable of providing a cosmetic capable of performing the treatment, and a cosmetic composition containing such a flaky coated particle.

[0011]

SUMMARY OF THE INVENTION The flaky coated particles according to the present invention are characterized in that the surface of particles made of a smectite clay mineral is coated with titanium oxide.

The cosmetic composition according to the present invention is characterized by containing the flaky coated particles according to the present invention as described above.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The flaky coated particles and cosmetic compositions according to the present invention will be specifically described below.

First, the flaky coated particles according to the present invention will be specifically described. The flaky coated particles according to the present invention are characterized in that the surface of the flaky particles composed of a smectite clay mineral is coated with titanium oxide.

That is, in the flaky coated particles according to the present invention, the surface of the flaky substrate particles is coated with titanium oxide, and the substrate particles are made of a smectite clay mineral. In the present specification, the smectite genus clay mineral means a layered clay mineral having a three-layer structure among montmorillonite genus clay minerals.

The smectite clay mineral used in the present invention includes montmorillonite, beidellite, nontronite, saponite, hectorite, sauconite,
Stephensite, iron saponite and the like.

When these layered clay minerals are cleaved by swelling or the like, the thickness cannot be reduced to about 0.2 μm or less, for example, in the case of kaolin, etc. The thickness can be reduced to about 0.001 μm.

By coating titanium oxide on the surface of the flaky particles thus obtained, a thickness of 0.001
The flaky coated particles according to the present invention having a thickness of from 0.2 to 0.2 μm, preferably from 0.001 to 0.1 μm are obtained.

As described above, since the flaky coated particles according to the present invention have a smaller flake thickness than conventional kaolin or mica, they can be monodispersed in a cosmetic by a usual mixing operation. When applied to the skin, cosmetics containing this compound can evenly cover the entire surface of the skin with a small amount of compounding.Compared to when applying cosmetics containing fine-grained titanium oxide to the skin Since it is flaky, it is uniformly dispersed without agglomeration in the cosmetic, so that the ultraviolet shielding effect is extremely high.

In the flaky coated particles according to the present invention,
It is preferable that the coating amount of titanium oxide is 4 parts by weight or more in terms of TiO _{2 with} respect to 1 part by weight of the smectite-based clay mineral. When the coating amount of the titanium oxide is less than 4 parts by weight, it may not be possible to cover the entire surface of the flaky particles composed of the smectite clay mineral with the titanium oxide. When the entire surface of the flaky particles is not sufficiently coated with titanium oxide, re-aggregation between the clay minerals may occur in the drying and firing steps when preparing the flaky coated particles. When such agglomerated flaky coated particles are blended with cosmetics, the cosmetics may be rough and the feel may be reduced, or the coated particles blended with the cosmetics may be difficult to adhere to the skin. In addition, cosmetics containing such agglomerated flaky coated particles may not be able to obtain a desired ultraviolet shielding effect when applied to the skin.

When the coating amount of titanium oxide in the flaky coated particles according to the present invention is 4 parts by weight or more as described above, the object of the present invention can be effectively achieved. It is not practical in that no improvement in the ultraviolet shielding effect and the like can be seen even if it is increased.

The titanium oxide coated on the flaky particles in the present invention may be composed of only a titanium oxide, or a composite containing titanium oxide as a main component and other inorganic oxides. It may be an oxide.

The method for producing the flaky coated particles according to the present invention is not particularly limited.
It can be produced based on the method described in No. 20.

This method is specifically described as follows. First, hydrogen peroxide is added to a sol and / or gel of hydrous titanium oxide to dissolve the hydrous titanium oxide.

Next, smectite clay mineral particles are added to the obtained aqueous solution of titanic acid and heated to 60 ° C. or higher.
As a result, titanium oxide precipitates and covers the surface of the smectite-based clay mineral particles.

The particles coated with titanium oxide in this manner are filtered, washed, dried, and then fired, if desired, to obtain the flaky coated particles according to the present invention. In the above method, since titanium oxide is precipitated as fine anatase-type crystals, a very dense layer can be formed on the surface of the smectite-based clay mineral particles.

Cosmetic Composition Next, the cosmetic composition according to the present invention will be specifically described. The cosmetic composition according to the present invention is characterized by containing the flaky coated particles according to the present invention as described above.

The amount of the flaky coated particles according to the present invention is as follows:
It is preferably from 1 to 80% by weight based on the total amount of the cosmetic composition. If the amount is less than 1% by weight, the effect of incorporating the flaky coated particles according to the present invention may not be sufficiently exerted. If the amount exceeds 80% by weight, bulkiness and puff removal may occur. In some cases, the quality of the cosmetic cannot be maintained due to deterioration or shape retention.

[0029] The cosmetic composition according to the present invention may contain various components usually contained in cosmetics, such as higher fatty alcohols, higher fatty acids, ester oils, paraffin oils, waxes and other oils, ethyl alcohol, and the like. Alcohols such as propylene glycol and sorbitol, mucopolysaccharides, collagens, PCA salts, humectants such as lactate, nonionic, cationic, anionic or amphoteric surfactants, gum arabic, xanthan gum, polyvinylpyrrolidone, Thickeners such as ethylcellulose, carboxymethylcellulose, carboxyvinyl polymer, modified or unmodified clay minerals, solvents such as ethyl acetate, acetone and toluene, inorganic and organic facial dyes, antioxidants such as BHT and tocophenol; Water, drugs, UV absorbers, organic Or a salt of an inorganic acid p
It contains one or more of H buffer, chelating agent, preservative, fragrance and the like.

Further, the cosmetic according to the present invention contains, if necessary, one or more of inorganic pigments such as silica, talc, kaolin, mica, sericite and synthetic inorganic compounds, and various organic resins. May be.

When the cosmetic according to the present invention is produced, these components are usually directly mixed. However, the above-mentioned flaky coated particles according to the present invention are coated with an organic or inorganic compound or the like. After processing, it may be mixed with other components.

The cosmetic according to the present invention is used in various forms such as powder, cake, pencil, stick, liquid, emulsion and cream.

[0033]

The flaky coated particles according to the present invention are very thin coated particles in which titanium oxide is coated on the surface of flaky particles obtained by cleaving a layered smectite clay mineral. Even if it is blended, it can be uniformly dispersed without aggregation.

Since the cosmetic composition according to the present invention contains the flaky coated particles according to the present invention, the cosmetic composition has an excellent feel and spreadability at the time of makeup and also has an excellent ultraviolet shielding effect. I have.

Further, the flaky coated particles according to the present invention can be monodispersed in the cosmetic composition without agglomeration unlike fine titanium oxide particles. Therefore, the cosmetic composition according to the present invention can obtain a very high ultraviolet shielding effect as compared with a cosmetic composition containing the same ratio of fine-particle titanium oxide.

[0036]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

[0037]

Example 1 Titanyl sulfate was dissolved in pure water to obtain a 2% by weight titanyl sulfate aqueous solution in terms of TiO ₂ . 15% aqueous ammonia was gradually added to this aqueous solution to obtain a white slurry having a pH of 8.5. This slurry was filtered and washed to obtain a cake of hydrous titanium hydroxide gel having a solid content of 11% by weight. 35 to 4.55 kg of cake obtained
After adding 3.57 kg of an aqueous hydrogen peroxide solution and 4.4 kg of pure water, the mixture was heated at 85 ° C. for 3 hours to obtain 12.5 kg of a 4.0% by weight titanic acid aqueous solution in terms of TiO ₂ .

Next, 56 g of flaky montmorillonite particles having a thickness of 0.01 to 0.05 μm and 12.5 kg of the above-mentioned titanic acid aqueous solution were mixed, and heated at 95 ° C. for 96 hours. The coated particles thus obtained are filtered and washed,
Next, after drying at 110 ° C., firing at 800 ° C. yields titanium oxide / flaky montmorillonite particles = 9.
/ 1 (weight ratio) and an average thickness of 0.02 µm flaky coated particles A (flaky montmorillonite particles coated with titanium oxide).

When the UV absorbance of the coated particles A was measured, a curve A shown in FIG. 1 was obtained. The measuring device and measuring method of the ultraviolet absorbance are as follows. Measurement device: SPF-290 analyzer (U.S.A.
Etric company) Measurement method: 2 mg of sample powder on one side of transparent medical tape
/ Cm ² . The UV absorbance of the obtained tape with sample powder was measured six times, and the average of the obtained values was defined as the UV absorbance of the sample powder.

[0040]

Example 2 Using the coated particles A obtained in Example 1,
The following composition: Pigment component Coated particles A 35.0% by weight Talc 45.1 {Bengara 1.0} Yellow iron oxide 2.5 Black iron oxide 0.05 Binder component Liquid paraffin 8.5 {Sorbitan sesquioleate 3.0 {Glycerin 4.85} Others Appropriate perfume Paraben An appropriate amount of cake-like foundation was produced in the following manner. —Method for Producing Cake Foundation— After the pigment component was stirred for 5 minutes with a Henschel mixer, a binder component heated and dissolved at 70 ° C. in the pigment component was dropped and mixed with stirring.

Next, a fragrance and paraben were added to the obtained mixture, and the mixture was stirred and mixed for 1 minute to produce a cake-like foundation. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF (Sun Protection Factor) value of the obtained cake-like foundation was measured using an SPF analyzer (SPF-29 manufactured by Optometric).
0).

Table 1 shows the results.

[0044]

Example 3 A cake-like foundation was produced in the same manner as in Example 2, except that the blending amount of the coated particles A was 50% by weight and the blending amount of talc was 30.1% by weight.

When the obtained cake-like foundation was used for makeup, it could be uniformly applied to the skin,
The finish was very good. Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2.

Table 1 shows the results.

[0047]

Example 4 Coated particles B were produced in the same manner as in Example 1 except that the titanium oxide / flaky montmorillonite particles (weight ratio) were changed to 4/1.

Using coated particles B instead of coated particles A,
Example 2 A cake-like foundation was produced in the same manner as in Example 2 except that the blending amount of the coated particles B was 10% by weight and the blending amount of talc was 70.1% by weight.

When the obtained cake-like foundation was used for makeup, it could be uniformly applied to the skin,
The finish was very good. Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2.

Table 1 shows the results.

[0051]

Example 5 Using the coated particles A obtained in Example 1,
The following composition: Pigment component Coated particle A 13.0% by weight Talc 3.0 着色 Color pigment proper amount Oil phase component Stearic acid 5.0 油 Lipophilic glyceryl monostearate 2.5 〃 Cetostearyl alcohol 1.0 プ ロ ピ レ ン Propylene monolaurate Glycol 3.0 〃 liquid paraffin 7.0 イ ソ プ ロ ピ ル isopropyl myristate 8.0 ブ チ ル butyl paraoxybenzoate qs aqueous phase component purified water 53.3 ト リ triethanolamine 1.2 ソ ル sorbitol 3.0 〃 paraben qs fragrance qs cream A foundation was prepared in the following manner. -Production method of creamy foundation-After mixing and grinding the above pigment component with a Henschel mixer,
The dispersion obtained by adding and dispersing this pigment component to the aqueous phase component was heated to 75 ° C. Then, 8
The oil phase component heated to 0 ° C. was added with stirring to emulsify, and then cooled to room temperature with stirring.

The creamy foundation thus obtained was applied to the skin with a smooth feel without aggregation and sediment, and the spreadability was extremely good. Also,
The SPF value of the obtained creamy foundation was measured in the same manner as in Example 2.

Table 1 shows the results.

[0054]

Example 6 Coated particles C were produced in the same manner as in Example 1 except that the titanium oxide / flaky montmorillonite particles (weight ratio) were changed to 85/15.

A cake-like foundation was produced in the same manner as in Example 2 except that coated particles C were used instead of coated particles A. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2. Table 1 shows the results.

[0057]

Example 7 Coated particles D were produced in the same manner as in Example 1 except that the titanium oxide / flaky montmorillonite particles (weight ratio) were changed to 98/2.

A cake-like foundation was prepared in the same manner as in Example 2 except that coated particles D were used instead of coated particles A. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2. Table 1 shows the results.

[0060]

Example 8 Coated particles E were produced in the same manner as in Example 1 except that flaky hectorite particles were used instead of flaky montmorillonite particles.

A cake-like foundation was prepared in the same manner as in Example 2 except that the coated particles E were used instead of the coated particles A. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2. Table 1 shows the results.

[0063]

Example 9 Coated particles F were produced in the same manner as in Example 1 except that flaky saponite particles were used instead of flaky montmorillonite particles.

A cake-like foundation was prepared in the same manner as in Example 2 except that the coated particles F were used instead of the coated particles A. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2. Table 1 shows the results.

[0066]

Example 10 Coated particles G were produced in the same manner as in Example 9 except that the ratio of titanium oxide / flaky saponite particles (weight ratio) was 4/1.

A cake-like foundation was produced in the same manner as in Example 2, except that the coated particles G were used instead of the coated particles A. When makeup was applied using the obtained cake-like foundation, it could be uniformly applied to the skin and the finish was very good.

Further, the SPF value of the obtained cake-like foundation was measured in the same manner as in Example 2. Table 1 shows the results.

[0069]

Comparative Example 1 Coated particles H were produced in the same manner as in Example 1 except that kaolin particles were used instead of flaky montmorillonite particles.

When the ultraviolet absorbance of the obtained coated particles H was measured in the same manner as in Example 1, a curve B shown in FIG. 1 was obtained.

[0071]

Comparative Example 2 A cake-like foundation was prepared in the same manner as in Example 2 except that coated particles H were used instead of coated particles A.

SP of the obtained cake-like foundation
The F value was measured in the same manner as in Example 2. Table 1 shows the results.

[0073]

[Table 1]

In Table 1 above, ratio-2 means Comparative Example 2.

[Brief description of the drawings]

FIG. 1 is a graph showing the ultraviolet absorbance of coated particles.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61K 7/02 A61K 7/00 A61K 7/42 A61K 7/48 C09C 3/06 CA (STN)

Claims (4)

(57) [Claims] 1. A flaky coated particle, characterized in that the surface of the flaky particle made of a smectite clay mineral is coated with titanium oxide. 2. The flaky coated particles according to claim 1, wherein the coating amount of the titanium oxide is 4 parts by weight or more in terms of TiO _{2 with} respect to 1 part by weight of the smectite group clay mineral. 3. The flaky coated particles according to claim 1, wherein the average thickness is 0.001 to 0.2 μm. 4. A cosmetic composition comprising the flaky coated particles according to any one of claims 1 to 3.