JPS6327418A - Cosmetic - Google Patents

Abstract

PURPOSE:A makeup cosmetic, obtained by blending flaky processed powder prepared by coating the surface of flaky inorganic powder having the major axis, minor axis and thickness within specific ranges with titanium oxide and/or iron oxide and having smooth extensibility as well as improved adhesive and hiding properties. CONSTITUTION:A cosmetic obtained by coating the surface of flaky inorganic power, particularly cleaved inorganic powder, e.g. cleaved talc. cleaved mica, etc.,having 0.5-50mu major axis, 0.2-30mu minor axis and 0.005-0.1mu thickness, more preferably both the major and the minor axes within the range of 0.5-20mu and the thickness within the range of 0.01-0.1mu with titanium oxide and/or iron oxide, preferably at 1-80wt% covering ratio based on the total flaky processed powder. The amount of the blended flaky processed power is preferably 0.5-85wt% based on the total cosmetic. EFFECT:Thin makeup finish.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to cosmetics with a novel feel, and more specifically, cosmetics that spread smoothly on the skin, have excellent adhesion and concealing properties, and have a thin makeup finish. In particular, the object is to provide a product suitable as a makeup cosmetic.

Traditionally, titanium dioxide has been used in cosmetics as a white pigment with hiding power, and is useful for covering stains, freckles, etc., and as a sunscreen.

However, cosmetics containing titanium dioxide tend to spread extremely hard on the skin, which not only worsens the feeling of use, but also causes unevenness, which may impair the cosmetic finishing effect. Since this tendency becomes more pronounced as the amount of titanium dioxide added increases, it becomes a problem as it contradicts the above-mentioned concealing effect.

On the other hand, mica titanium is widely used in cosmetics as a bar pigment with concealing power and transparency, and is used in cosmetics that aim to create a bar look, especially eye color, lip color, nail color, etc. as a point of makeup. has been done.

However, make-up cosmetics containing titanium mica, such as solid foundations, have a smooth feel on the skin, but if the pearly feel is emphasized, small wrinkles on the skin become noticeable, and the natural luster is lost. ,
This may cause dullness of the skin and may worsen the effect of makeup finishing. This tendency becomes more pronounced as the amount of titanium mica added increases, so the addition of titanium mica has been limited to products that require only the point effect derived from the pearly feel of makeup cosmetics.

Incidentally, various attempts have been made to solve the above problems. In other words, in the case of titanium dioxide, the surface of titanium dioxide is alumina.

A method using surface-treated titanium dioxide obtained by coating with an inorganic substance such as silica, yellow iron oxide, or an organic substance such as a higher fatty acid or a salt thereof (JP-A-59-9
8009 and JP-A-58-49307), or a method using fine particle titanium dioxide (JP-A-58-4930)
7), but the former method, which uses surface-treated titanium dioxide, still does not sufficiently improve spreadability and spreadability on the skin, and it cannot be said that it is excellent in uniformity during application and cosmetic finishing effect. hard.

The latter method using fine particles of titanium dioxide improves adhesion and uniformity, but in terms of smoothness on the skin, it is rather moist and difficult to spread.

Similarly, there are methods to improve mica titanium, such as using mica titanium with a reduced pearlescent feel, but the main issues are smoothness of spread and adhesion on the skin.

Although the uniformity and hiding power were good, the makeup finish had a thick and unnatural finish.

On the other hand, thin plate-like inorganic powders such as interfold sericite are also known as powder components that have transparency and smooth spread, and have also been used in some cosmetics. However, the thickness of interfold sericite is too thin and cannot be expected to provide much concealing performance, and in powder mixture systems, the degree of difference in particle size from other powders is too uneven.
As a result, the original thin finish could not be obtained, but rather a thick white finish.

Therefore, in view of the above-mentioned current situation, the inventors of the present invention sought to create a cosmetic with a new feel that combines smooth spread, adhesion, uniformity, concealment, and a natural, thin makeup finish effect. As a result of extensive research, we have found that powders with specific particle diameters (major axis, minor axis, thickness), which are thinner than ordinary powders and thicker than cleaved inorganic powders, can be used for cosmetic purposes. By obtaining the fact that there is a property that satisfies the inherent smoothness of elongation and thinness of the finish as a material, and by providing adhesion and hiding power in addition to this, all problems can be solved. Heading,
Based on this knowledge, we have completed the present invention.

That is, the present invention has a major axis of 0.5 to 50μ and a minor axis of 0.2
-30μ, thickness o, oos -0.1μ The surface of a thin plate-like inorganic powder is coated with titanium dioxide and/or iron oxide. This is related to fees.

The present invention will be explained in detail below.

The particle size of the thin plate-like inorganic powder applied to the present invention is such that the major axis is 0.5 to 50μ and the minor axis is 0.2 to 30μ.
, thickness o, oos~0.1μ (average thickness 0.02~0.
08μ), more preferably both long and short axes are 0.5 to 20μ,
Thickness 0. O1~0.1μ (average thickness 0.03~0.08
Examples of existing inorganic powders that satisfy the conditions that can be used as a substrate for such thin plate-like processed powders include interfold talc, interfold mica, and interfold seri. Examples include cleaved inorganic powders such as sericite, and among these, interfold sericite is the most preferred from the viewpoint of thickness, but it is not limited to these inorganic powders as long as it satisfies the above conditions.

If the major and minor axes are smaller than the above range, even if coating is performed, the desired layered ductility (good elongation) cannot be obtained due to random orientation, and the shear embrittlement is insufficient, making it difficult to obtain a desirable cosmetic. On the other hand, if it becomes larger than the above range, a covering will be added to it, causing a foreign body sensation or discomfort on the skin. On the other hand, if the thickness is smaller than the above range, the hardness of the plate-shaped powder will be insufficient, and for example, the plate-shaped powder will exhibit flexibility in the molded product (cosmetic), so if the coating is Even if some hardness reinforcement is performed, the desired layered ductility cannot be obtained. On the other hand, if the thickness is thicker than the above range, the processed powder coated thereon will have the same thickness as normal powder, resulting in a thick finishing effect.

Next, the thin plate-like inorganic powder described above is coated with titanium dioxide or iron oxide (including iron oxyoxide). Mixed grinding methods (dry or wet) and chemical deposition methods are selected and implemented, but the deposition method is advantageous in view of the ease of controlling the coverage rate and the uniformity of the resulting coating, which will be described later. It will be done.

However, the coating amount of titanium dioxide and/or iron oxide on the thin plate-like inorganic powder is important, and for example, although the coating amount varies depending on the thickness of the thin plate-like inorganic powder itself, which is the substrate, Approximately 1 to 80% by weight of the whole,
Preferably, it is selected within the range of 5 to 70% by weight. If the coverage is less than 1% by weight, the required hiding power will not be obtained and a transparent appearance will appear, while if it exceeds 80% by weight, the covering power and adhesion will be good, but the characteristics of the coating powder will become stronger. , it becomes impossible to obtain smooth elongation.

The thin plate-shaped processed powder according to the present invention obtained in this way is
This can be used as it is, or if necessary, can be further surface-treated with a known treatment agent and then incorporated into cosmetics that generally require the use of powder, in the same manner as conventional inorganic pigments. .

Cosmetics obtained in this way include liquid foundation and powder foundation.

Mainly make-up cosmetics such as cake foundation, stick foundation, face powder, lipstick, rouge, eyeliner, eyeshadow, eyebrow pencil, etc., as well as body powder, antiperspirant, sunscreen cream, whitening powder, and milky lotion. A wide range of products are exemplified, such as , lotion, etc. Among the cosmetics mentioned above, especially solid cosmetics such as powder foundation, cake foundation, stick foundation, and face powder, the most noticeable effects are the feel when applied and spread on the skin, and especially the makeup finish effect. Therefore, the cosmetic composition of the present invention is optimal.

In addition, as a surface treatment method for the above-mentioned thin plate-shaped processed powder, for example, with the aim of improving water resistance and sweat resistance, silicone oil, fluorine-based oil containing a perfluoroalkyl group,
Higher fatty acids or their salts.

Examples include a method of treating with a higher fatty acid ester or the like, or a method of treating with lecithin, hydrogenated lecithin, acyl amino acid, peptide, etc. for the purpose of imparting a moist feeling.

In addition, the amount to be added to the above-mentioned cosmetics is arbitrarily selected depending on the properties of the cosmetics, for example, approximately 0.5 to 40% by weight for liquid foundation, approximately 1 to 80% by weight for cake foundation, and approximately 1 to 80% by weight for powder foundation. Approximately 1.5-85% by weight, face powder approximately 1-95% by weight, cream approximately 0.5-2%
Therefore, the range is usually selected to be about 0.5 to 95% by weight, preferably 2 to 85% by weight, based on the total cosmetic composition.

Furthermore, in addition to the thin plate-like processed powder, the cosmetic of the present invention may also contain various ingredients commonly used in cosmetics, such as oils and fats, waxes, surfactants, and antioxidants.

Fragrances, pigments/powders, alcohols, polyhydric alcohols, medicinal ingredients, ultraviolet absorbers, thickeners, chelating agents, water, etc. can be blended.

Here, in order to explain the present invention in more detail, an example of manufacturing a thin plate-shaped processed powder according to the present invention will be shown below.

Production Example 1 In 800 parts of an aqueous solution containing 160 parts of titanyl sulfate,
How many sericite (major axis 0.7~20μ, minor axis 0.2~1
0μ, average thickness O, OSμ) 120 parts were thoroughly stirred,
The mixture was heated while being uniformly dispersed and boiled for about 3 hours. After cooling, the mixture was rinsed with water and calcined at 300°C to obtain 200 parts of open sericite coated with titanium dioxide.

Production Example 2 Titanium dioxide (30% by weight) coated interfold sericite (major axis Add 400 parts of 0.9-25μ, minor axis 0.5-20μ, average thickness 0.09μ), heat the slurry to 80℃ while stirring, and heat at 80℃ for 1 hour until the mother liquor becomes colorless. Stir. Thereafter, the slurry was filtered, washed, dried, and fired at 300° C. to obtain 680 parts of skin-colored brown iron oxide/titanium dioxide-coated sericite.

When applied to the skin, the thin plate-shaped processed powder according to the present invention obtained as described above has a mild feeling when used, smooth elongation and spread, and has a thin and close contact, giving a feeling of bare skin. It can exhibit an excellent effect of providing coverage while still having a strong effect. Therefore, it is expected that this product will be used to provide cosmetics with an unprecedented cosmetic finish.

Therefore, in order to evaluate cosmetics containing the thin plate-shaped processed powder according to the present invention, the powder foundation of the present invention shown in Example 1 below and the thin plate-shaped processed powder in Example 1 below were used as a comparative product. , each of fine particle titanium oxide (Comparative Example 1)
, non-pearl mica titanium (Comparative Example 2), interfold sericite (Comparative Example 3), and a mixture of interfold sericite and titanium oxide with the same composition as the thin plate-shaped processed powder (Comparative Example 4)
A comparative sensory evaluation test was conducted by 10 female panelists using the powder foundation substituted with the powder foundation.

The test method was to have each sample applied to the face with a makeup base applied, and the elongation and spreadability at that time.

The evaluation items of adhesion, uniformity, hiding power, and makeup finish were evaluated according to the following evaluation criteria (10 point system), and the results (average values) are shown in Table 1.

Evaluation criteria> Elongation/spreadability No 0iii≠-+0 Adhesion
No 0f-zu nana 1-0 uniformity bad'
1-i-t--White 1i-i→0 Good/concealing property No 0iii→-1-iti→0 Table = 1 As shown in the results of Table 1, the cosmetics of the present invention have a good effect on the skin. When applied on top, it has good spreadability (good and smooth), adhesion to the skin, and concealing ability (good), and the makeup finish is uniform and thin, meaning it has a skin-like feel and a strong look. It has become clear that this product has excellent properties that allow it to achieve a cosmetic finish that has never been achieved before.

Examples are shown below. Incidentally, the blending ratio is in parts by weight.

Example 1. Powder foundation (A) Liquid paraffin 13 Isopropyl myristate 0.5 Sorbitan monooleate 03 Dimethylpolysiloxane 3 Fragrance
0.2 glycerin
1(B) Yellow iron oxide
2 valve handle
0.8 group blue
0.2 Silk Powder 4 Titanium Mica
1 (Method) The above B formulation was mixed in a high-speed mixer (Henschel type mixer).
After mixing for 2 minutes in a pulverizer, the mixture is pulverized and mixed in a pulverizer. This product is mixed at low speed at 80° C. with the above formulation A in a Henschel mixer for 5 minutes, cooled to 20° C., and then press-molded into a medium plate using a nibbles machine to obtain a product.

Example 2. Liquid foundation (A) Liquid paraffin IO Vaseline 5 Isopropyl myristate 3 Cetanol
l stearic acid
2 Glycerin monooleate 0.5PO
E (25) Monostearate 1.5 (B) Yellow iron oxide 1.5 valve handle
0.5 Black iron oxide 0.2
(C) Propylene glycol 5-glycerin 5-potassium hydroxide
0.2 ethylparaben
0.2 fragrance
0.3 Purified water
46.1 (Method) The formulation of A above was uniformly dissolved at 75-80°C.

Mix and pulverize the formulation B above using a mixer and add to this, stir and disperse to obtain a dispersion.

To this dispersion, the above-mentioned formulation C is uniformly dissolved and mixed at 75 to 80° C. and gradually added thereto with stirring to obtain an emulsified dispersion. This is cooled to 30°C to form a product.

Example 3. Face powder (A) Yellow iron oxide L valve
pattern
0.4 group blue
0.1 thin plate-shaped processed arm-opening sericite (
Production example 1) 55 thin plate processed arm-opened sericite (Production example 2)
30 (Fe!03-TiOt 59% coverage, average thickness 0
．． 12μ) Talc 3
．． 0 Nylon powder 2.0 Aluminum stearate 3.5 Titanium mica 0.5 (B) Dimethylpolysiloxane 4 Fragrance
0.5 (Method) The above formulation A was mixed in a high-speed mixer (Henschel type mixer).
After mixing for 2 minutes in a pulverizer; grind and mix in a pulverizer. This product is mixed with the formulation B above in a Henschel mixer at low speed for 5 minutes, and then press-molded into a medium plate using a press to obtain a product.

Example 41 Sun protection agent (A) Liquid paraffin 8 Squalane 5 Vaseline
2isopropyl myristate
3 cetanol
l Stearic acid 2 Glycerin monooleate 0.5POE (25)
Monostearate 1.0 Isopropyl methoxycinnamate 1.0 (B) Fine particle titanium oxide
8.0 (C) Propylene glycol
5 Glycerin
Potassium 5-hydroxide 0.2 Ethylparaben 0.2 Fragrance

0.3 Purified water 46.8P
OE (25) Monostearate 0.5 (Method) The above formulations B and C were mixed and ground in a ball mill for 48 hours. Separately, heat the formulation of A above at 75-80°C.
Dissolve and mix uniformly with the pulverized solutions of B and C.
The mixture was uniformly dissolved and mixed at 80°C and gradually added while stirring to obtain an emulsified dispersion. This is cooled to 30°C to form a product.

Claims (1)

[Claims] 1) Major axis 0.5 to 50μ, minor axis 0.2 to 30μ, thickness 0
．． 1. A cosmetic comprising a thin plate-like processed powder obtained by coating the surface of a thin plate-like inorganic powder with titanium dioxide and/or iron oxide in the range of 0.005 to 0.1 μm. 2) The cosmetic according to claim 1), wherein the thin plate-like inorganic powder is a cleaved inorganic powder. 3) The cosmetic according to claim 1, wherein the coverage of titanium dioxide and/or iron oxide is 1 to 80% by weight based on the entire thin plate-shaped processed powder. 4) The blending amount of the thin plate-like processed powder is 0.
5 to 85% by weight of the cosmetic according to claim 1). 5) The cosmetic according to claim 1, which is a make-up cosmetic.