JP3160398B2 - Solid powder cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid powder cosmetic containing bowl-shaped fine particles. More specifically, by blending approximately semi-spherical or semi-elliptical spherical, water absorption having a large concave portion in the center, and bowl-shaped fine particles having a large oil absorption, in a system with a relatively low oil content, when water is used, Smooth, creamy feel and refreshing feeling are given,
In addition, in relatively oily systems, it has a softer feel and extensibility than ever before, and the deterioration of removal such as caking has been improved. In oily systems with more oil content, strong adhesion to the skin The present invention relates to a novel solid powder cosmetic which is imparted with a property and a refreshing non-sticky feel.

[0002]

2. Description of the Related Art Conventionally, in solid powder cosmetics, many resin powders have been blended mainly for the purpose of improving usability such as spreadability, feeling of adhesion to skin and removal. However, since these powders are substantially spherical fine particles,
There is a drawback that water absorption and oil absorption are small, and many restrictions have been imposed on the formulation system and usability.

For example, when a solid powdery cosmetic powder of a low oil content in a relatively low oil content region having an oil content of about 1 to 20% is used together with water, the resin powder has a small water absorption, so that a refreshing feeling is obtained. There was a problem that it was lost and it was difficult to obtain a smooth and creamy feel.

[0004] In addition, in the case of a solid powder cosmetic of a high oil content type powder in a relatively high oil content region having an oil content of about 20 to 40%, the oil absorption of the resin powder is particularly small, so that it can be removed as the oil content increases. However, there has been a problem that the agitation deteriorates rapidly, causing a so-called caking phenomenon. For this reason, the amount of oil has to be limited, and it has been difficult to provide a moist feel and smooth usability by the oil.

Further, even in the case of oily solid powder cosmetics having an oil content of about 40 to 70%, the feeling of spreading can be improved by blending a large amount of them, especially because of the low oil absorption of the resin powder. The sticky feel was felt, and there was a limit because a feeling of close contact with the skin could not be obtained.

[0006]

In view of such circumstances, as a result of diligent research, the shape of the resin powder has been improved, and the resin powder has a large semi-spherical or semi-elliptical spherical central recess. By using the bowl-shaped fine particles, it is possible to obtain a powder having excellent water absorption and oil absorption with excellent adhesion to the skin while maintaining the sliding property (rolling effect) comparable to the conventional spherical resin powder. Was found.
By blending this into a solid powder cosmetic, it is possible to overcome the problems and caking phenomena when using water as described above, and to obtain the desired usability and finished feeling in each oil area in accordance with the purpose. As a result, the present invention has been completed based on this finding.

[0007]

That is, the present invention is to provide a novel solid powder cosmetic containing semi-spherical or semi-elliptic spherical bowl-shaped fine particles having a large concave portion in the center.

[0008] The bowl-shaped fine particles applied to the present invention are:
Specifically, as shown in FIG. 1 or FIG. 2, a fine particle having a large concave portion in the center and having a shape close to a hemisphere or a semi-ellipse, and an opening portion shown in FIG. Refers to a shape.

The particle diameter of the bowl-shaped fine particles described in the present invention is such that the average diameter of the opening (a long opening in the case of an elliptical shape) is 2 to 100.
μm, preferably 3 to 50 μm. By setting the particle size in this range, it is possible to obtain fine particles having high slippage (rolling effect) and excellent adhesion to skin as well as high water absorption and oil absorption.

The resin forming the shell of the bowl-shaped fine particles of the present invention is a polymer obtained from a polymerizable monomer and a crosslinking agent. As the polymerizable monomers, styrene, methyl styrene, vinyl toluene, methacrylates,
Acrylic esters, vinyl acetate, acrylonitrile, vinyl chloride, vinylidene chloride, chloroprene, isoprene, butadiene, acrolein, acrylamide,
Allyl alcohol, vinyl pyridine, vinyl benzoate,
Allyl benzoate and the like are exemplified. These mixtures may be used. As an ester residue such as acrylic acid and methacrylic acid, C1-18, preferably C1-4,
Particularly, methyl or ethyl ester is preferable.

Examples of the crosslinking agent include divinylbenzene, ethylene dimethacrylate, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, 1,3-butylene dimethacrylate, allyl methacrylate, and trimethylolpropane trimethacrylate. One or two or more are selected.

As a method for producing the bowl-shaped fine particles of the present invention, for example, there is a method in which a polymerizable monomer is subjected to suspension polymerization with stirring in water in the presence of a crosslinking agent, a hydrophobic liquid and a polymerization initiator. At this time, the hydrophobic liquid is included in the polymer film of the polymer. In the method of the present invention, the hydrophobic liquid-containing particles may be used as they are, or a component useful for cosmetics may be used as the hydrophobic liquid. You may.

[0013] The bowl-shaped fine particles of the present invention have a particle size of 80-140.
It has a high water absorption of ml / 100 g. This is a very high value even when, for example, the water absorption of spherical fine particles of the same material having the same average particle diameter is 40 to 80 ml / 100 g. In addition, the bowl-shaped fine particles of the present invention have 9
It has high oil absorption of 0 to 150 ml / 100 g.
This is a very high value even when, for example, the oil absorption of spherical particles of the same material having the same average particle diameter is 40 to 70 ml / 100 g. All of these reasons are due to the large concave part at the center of the bowl-shaped fine particles of the present invention,
This is because water or oil is included.

The mixing amount of the bowl-shaped fine particles of the present invention in the solid powder cosmetic is 0.5 to 60% by weight (hereinafter referred to as%), preferably 2 to 30%. If it is less than 0.5%,
The mixing effect of the bowl-shaped fine particles cannot be sufficiently exerted, and if it exceeds 60%, the finish becomes powdery and the impact resistance deteriorates.

The solid powder cosmetic of the present invention contains an oil component and a normal powder as essential components in addition to the above-mentioned bowl-like fine particles, and is classified into a low oil type powdery type, a high oil type powdery type, and an oil type according to the amount of the oil component. being classified.

The oils used in the present invention are those generally used in ordinary cosmetics having high skin safety, such as liquid paraffin, squalane, castor oil, olive oil, jojoba oil, glyceryl diisostearate, Glyceryl triisostearate, trimethylolpropane tri-2-ethyl isostearate, glyceryl tri-2
-Ethyl hexanoate, isopropyl myristate,
Cetyl-2-ethylhexanoate, glyceryl triisostearate, 2-heptylundecyl palmitate, methylpolysiloxane, methylphenylpolysiloxane, polybutene, diisostearylmalate, lanolin, volatile linear silicone oil, volatile Cyclic silicone oil, volatile hydrocarbon oil, polyethylene wax, ceresin, solid paraffin, microcrystalline wax,
Vaseline, beeswax, carnauba wax, candelilla wax, alkyl-modified silicone wax and the like can be mentioned, and one or more of these can be arbitrarily selected.

The content of these oil components is 0.5 to 70%, preferably 1 to 50%, in the solid powder cosmetic of the present invention.
It is. If it is less than 0.5%, a problem occurs in the impact resistance, and the adhesion to the skin is remarkably deteriorated. On the other hand, if it exceeds 70%, the effect of the oil content becomes large, and even if the bowl-shaped fine particles of the present invention are maximally incorporated, the effect of suppressing stickiness cannot be obtained.

The powder used in the solid powder cosmetic of the present invention is not particularly limited as long as it is generally used in cosmetics. For example, talc, kaolin, sericite, muscovite, synthetic mica, Phlogopite, biotite, biotite, vermiculite, magnesium carbonate, calcium carbonate, diatomaceous earth, magnesium silicate, calcium silicate, aluminum silicate, barium silicate, barium sulfate, silica,
Inorganic powders such as hydroxyapatite, zeolite, boron nitride, etc., nylon powder, polyethylene powder,
Spherical resin powders such as polymethyl methacrylate and styrene benzene copolymer; inorganic white pigments such as titanium oxide and zinc oxide; inorganic oxide pigments such as iron oxide, iron titanate, carbon black, chromium oxide, cobalt titanate, ultramarine and navy blue; Pal pigments such as bismuth oxychloride, fish scale, colored titanium coated mica, clay minerals such as bentone, metal powders such as aluminum powder and copper powder, Red No. 201, Red No. 202, Red No. 204, Red No. 205
No. 226, Orange No. 203, Orange No. 204, Yellow No. 205, Yellow No. 401, and / or Organic Pigments such as Blue No. 404. These powders were further subjected to hydrophobic treatment with silicones, fatty acid esters and the like. Powders and the like are also included. One or more of these are arbitrarily selected.
The compounding amount is generally 0.5 to 70%.

The solid oily cosmetic of the present invention may further contain, if necessary, a surfactant, a humectant, an antioxidant, an ultraviolet absorber, a dye, a fragrance, and the like, in addition to the above components. Of course, these must be used under qualitative and quantitative conditions that do not impair the effects of the present invention.

Next, the present invention will be described in more detail with reference to production examples of the bowl-shaped fine particles according to the present invention. The present invention is not limited by this.

(Production Example 1) An oil phase and an aqueous phase were prepared with the following compositions. (Oil phase) Ingredients parts by weight methyl methacrylate 108 ethylene glycol dimethacrylate 12 liquid paraffin 30 2,2'-azobisbutyronitrile 1 (aqueous phase) (adjusted with PH 3.3 sulfuric acid) deionized water 300 colloidal silica (solid 20%) 15 Acidic acid-diethanolamine condensate (50% condensate) 1

The above oil phase and aqueous phase are combined with T. K. Homo mixer
The oil phase was dispersed in the aqueous phase by performing high-speed stirring for 3 minutes using (manufactured by Tokushu Kika Kogyo). Thereafter, the mixture was charged into a 1.5-liter separable flask purged with nitrogen, and polymerized at 65 ° C. for 5 hours under stirring at 200 rpm. The product was filtered to give a cake containing 28% water. 8 this cake
Drying at 0 ° C. for 5 hours gave white fine particles having an average particle size of 5 to 15 μm. The shape of the particles was spherical bowl-like. An SEM photograph of the particles is shown in FIG. The water absorption of the fine particles was 105 ml per 100 g, which was higher than that of the spherical particles. The oil absorption of the liquid paraffin of these fine particles is
It was 117 ml per 100 g, which was also higher than that of a spherical one.

(Production Example 2) An oil phase was prepared with the following composition. (Oil phase) Ingredients Parts by weight Methyl methacrylate 90 Ethylene glycol dimethacrylate 10 Liquid paraffin 50 2,2'-azobisbutyronitrile 0.6

Fine particles were prepared in the same manner as in Production Example 1 using the above oil phase and the aqueous phase of Production Example 1. The obtained fine particles were white, oval, and bowl-shaped with an average particle size of 5 to 15 μm. FIG. 2 shows an SEM photograph of the particles. The water absorption of the fine particles was as high as 120 ml per 100 g of the powder. The oil absorption of the liquid paraffin of these fine particles was significantly higher than that of a spherical powder having the same composition and particle diameter as 140 ml.

Next, the present invention will be described in more detail with reference to examples of solid powder cosmetics containing the bowl-like fine particles according to the present invention. The present invention is not limited by this. All compounding rates are% by weight.

Incidentally, the evaluation of the prototype solid powder cosmetic preparation was as follows: removing, sticking, spreading, close contact with the skin, moist feeling of the finish, stickiness of the finish, refreshing sensation (when using water), creamy sensation (water (When used), the sensory evaluation was performed by a professional panel n = 10 persons according to the following criteria.

(1) Removal Very good removal. ◎ Somewhat good. ○ Somewhat poor. △ Very poor removal. ×

(2) With Very good ◎ Somewhat good ○ Somewhat bad △ Very bad ×

(3) Growth Very good ◎ Somewhat good ○ Somewhat bad △ Very bad ×

(4) Feeling of adhesion to skin Very good ◎ Somewhat good ○ Somewhat bad △ Very bad ×

(5) Moist feeling of finish Very moist ◎ Somewhat moist ○ Not somewhat moist △ Not very moist ×

(6) Stickiness of finish Very non-sticky ◎ Not sticky ○ Slightly sticky △ Very sticky ×

(7) Refreshing sensation (when using water) Very refreshing ◎ Somewhat refreshing ○ Somewhat no refreshing △ No refreshing ×

(8) Creamy feeling (when using water) Very creamy feeling ◎ Some creamy feeling good ○ Somewhat creamy feeling not good △ No creamy feeling at all ×

(Dual-use type, low oily powdery foundation)

[Table 1]

(Preparation method) After mixing 1 to 7 with a Henschel mixer, 8 to 12 which have been heated and mixed in advance are added, and the oil is uniformly mixed. This was pulverized and sieved, and then punched into a middle plate to obtain a low oily powdery dual-use solid foundation.

(Evaluation)

[Table 2]

As can be seen from Table 2, Comparative Example 1 was excellent in the ability to be attached to a sponge and spread, but lacked in the adhesion to the skin, and especially felt completely refreshing and creamy when using water. I can't. Comparative Example 2 containing no spherical resin powder
The sample had a refreshing feeling and a creamy feeling in Comparative Example 1 but in a certain direction, but were not sufficient, had poor stretchability in dry use, and had a use feeling lacking in adhesion to the skin. On the other hand, Example 1 in which the bowl-shaped fine particles of the present invention were blended was used.
Was very excellent in taking off to a sponge, sticking to the skin, and spreading, and also excellent in adhesion to the skin as compared with the comparative example. Also noteworthy is that when using water, the recesses of the bowl-shaped fine particles contain plenty of water, so that the refreshing feeling that gives the skin a crisp feel and the creamy feeling like using an emulsified cream foundation on the skin. It was a completely new type of dual-use foundation that had never been seen before.

(High oil content powdery solid foundation)

[Table 3]

(Preparation method) After mixing 1 to 8 with a Henschel mixer, 9 to 13 which have been heated and mixed in advance are added, and the oil is uniformly mixed. This was pulverized, sieved, and then punched into a medium dish to obtain a high oily powdery solid foundation.

(Evaluation)

[Table 4]

The high oily powdery solid foundations containing the conventional spherical resin powders of Comparative Examples 3 and 4 are excellent in spreading feel but very poor in removal.
Continued use with a sponge caused a caking phenomenon in which the compact surface became hard and the removal became significantly worse. For this reason, the adhesion to the skin deteriorated, and the feeling of adhesion and moistness were not sufficient. Comparative Example 5 containing no resin powder
Had a serious defect that the growth was so heavy that the foundation could not be spread evenly on the skin. In contrast, Example 2 in which the bowl-shaped fine particles of the present invention were blended,
In spite of the fact that the prescription system was a high oil type powdery type, it was very excellent in terms of peeling, sticking and spreading compared to the comparative example, and also excellent in adhesion to the skin.

Furthermore, the bowl-shaped fine particles of the present invention have a very high oil absorption and can sufficiently contain the oil component in the prototype, so that they are very excellent in the moist feeling after coating, and are completely new and unprecedented. It was a high oily powdery solid foundation.

[0044]

[Table 5]

(Preparation method) 3, 4, 5, 6, and 15 are dissolved by heating, and 7-14 are added and dispersed by dispersing. This product is treated by TK Mill manufactured by Special Machinery Co., Ltd. and heated to 85 ° C. 1 and 2, which were previously heated and melted and mixed at 90 ° C., were added thereto, mixed, and then degassed. After filling in a predetermined stick container, it was quenched at 5 ° C. and molded.

(Evaluation)

[Table 6]

In Comparative Example 6, although the growth was light, it felt slippery and slipped on the skin, and there was no adhesion to the skin.
The finish was also very sticky. On the other hand, in Example 3 in which the bowl-shaped fine particles of the present invention were blended, the finish was excellent in stickiness, light spreadability, and adhesion with the adhesion of the bowl-shaped fine particles. Furthermore, since a large amount of bowl-shaped fine particles having a large oil absorption is blended, the oily foundation is a new type of oily stick foundation which does not feel sticky while retaining the unique moist skin feel of the oily foundation.

[0048]

[Table 7]

(Preparation method) After mixing 4 to 13 with a Henschel mixer, 1 to 3 and 14 which have been heated and mixed in advance are added, and the oil is uniformly mixed. This was pulverized and sieved, and then punched into a middle plate to obtain a powder-type solid eye shadow.

[0050]

EFFECT OF THE INVENTION The solid powder cosmetic composition of the present invention is smooth and clean when used with water in a system having a relatively low oil content.
It has a good feel and a refreshing feeling, and in a relatively oily system, it has a softer use feel and extensibility than ever before, and the deterioration of removal such as caking has been improved.
Further, in an oily system having a higher oil content, the present invention provides an unprecedented epoch-making solid powder cosmetic which is provided with strong adhesion to the skin and a refreshing non-sticky feel. .

[Brief description of the drawings]

FIG. 1 SEM of a bowl-shaped fine particle structure used in the present invention
Photo.

FIG. 2 is an SEM of a bowl-shaped fine particle structure used in the present invention.
Photo.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigenori Kumagai 1050 Nippa-cho, Kohoku-ku, Yokohama, Kanagawa Prefecture Inside Shiseido Research Laboratories Co., Ltd. (72) Keifumi Yoshikawa 2-3-1, Shibukawacho, Yao-shi, Osaka Matsumoto Yushi Pharmaceutical Co., Ltd. (58) Fields investigated (Int. Cl. ⁷ , DB name) A61K 7/02 CA (STN)

Claims (3)

(57) [Claims] 1. A solid powder cosmetic comprising substantially semi-spherical or semi-elliptical spherical bowl-shaped fine particles having a large concave portion in the center. 2. The average diameter of the opening of the bowl-shaped fine particles is 2
The solid powder cosmetic according to claim 1, which has a thickness of from 100 to 100 µm. 3. The bowl-shaped fine particles comprise at least one polymerizable monomer selected from styrene, methacrylate, acrylate, vinyl acetate and acrylonitrile, and divinylbenzene, ethylene glycol dimethacrylate, and dimethacrylic acid. Ethylene, triethylene glycol dimethacrylate, 1,3-butylene dimethacrylate,
The solid powder cosmetic according to claim 1 or 2, which is a bowl-shaped fine particle obtained from one or more crosslinkers selected from allyl methacrylate and trimethylolpropane.