JPH0632725A - Two-phase type cosmetic - Google Patents

Abstract

PURPOSE:To obtain a two-phase type cosmetic having excellent preventing effects on greasiness by sebum, shininess, make-up disorder, etc., maintaining these effects for a relatively long period of time. CONSTITUTION:This two-phase type cosmetic comprises powder obtained by coating the surface of a resin with an organic substance, having preferably 0.01-500mum, especially 0.02-100mum average particle diameter and an aqueous medium (water or mixture of water with monohydric alcohol and glycerol). Dimethylpolysiloxane polymer, acrylate copolymer, porous vinyl-based polymer, polymethylsesquioxane, nylon powder, crosslinked polystyrene powder, etc., may be cited as the resin and zinc oxide, titanium oxide, sericite, silica, etc., as the inorganic substance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-phase type cosmetic composition, and more particularly to a two-phase type cosmetic composition capable of preventing uncomfortable feeling such as stickiness on the skin, gloss, and makeup loss.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
In order to prevent stickiness and oiliness on the skin, so-called two-phase type cosmetics such as water-white powder containing an astringent or an inorganic powder, and calamine lotion have been developed.

However, in a two-phase type cosmetic composition, a good feel on the skin cannot be obtained only by blending the astringent agent. On the other hand, when an inorganic powder is blended, the aqueous powder contains the inorganic powder. Are not preferred as a product form because they are aggregated and difficult to re-disperse, and the surface of the inorganic powder is hydrophilic, so that the oil treatment capacity (oil absorption capacity) is lost, and the squeaky or sticky feeling on the skin is caused. Satisfaction has not been obtained yet. Furthermore, even when a resin that is generally considered to have a high oil absorption capacity is blended, it is difficult to blend it stably in an aqueous system, and even when a resin that can be well dispersed is used, the resulting two-phase cosmetic Many do not provide a good feel.

Therefore, there has been a demand for the development of a two-phase type cosmetic composition which has good dispersibility of powder, excellent oil treatment ability and a good feeling of use.

[0005]

Means for Solving the Problems The inventors of the present invention have made extensive studies in view of such circumstances, and as a result, an aqueous dispersion liquid of a powder in which a resin surface is covered with an inorganic substance shows good dispersibility, and further, on the skin. The inventors have found that it does not cause stickiness or luster and have completed the present invention.

[0006] That is, the present invention provides a two-phase cosmetic composition comprising a powder obtained by coating a resin surface with an inorganic substance and an aqueous medium.

The resins preferably used in the present invention include, for example, those shown in the following (a) to (i).

(A) "Trefil E-500", "Trefil E-501" (above, manufactured by Toray Dow Silicone Co., Ltd.)
Dimethyl polysiloxane polymer such as. (B) An acrylate copolymer having a structural unit represented by the following general formulas (1) and (2).

[0009]

[Chemical 1]

A particularly preferable example of the acrylate copolymer is "POLYTRAP" (manufactured by Dow Corning). (C) A porous vinyl polymer obtained by polymerizing one or more vinyl monomers having a solubility parameter of 7 to 10 and further making them porous. Specific examples thereof include those described in JP-A-63-316715. (D) A polymethylsesquioxane having an intermediate structure between inorganic and organic in which one methyl group is bonded to a silicon atom in a network structure in which a siloxane bond is three-dimensionally extended. Particularly preferred examples of polymethylsesquioxane include "Tospearl 240", "Tospearl 120", and "Tospearl 13".
0 ”,“ Tospearl 140 ”(above, manufactured by Toshiba Silicone Co., Ltd.) and the like. (E) Polymethylmethacrylates such as "Microsphere M", "Microsphere M-100", "Microsphere M-300", "Microsphere M-400" (all manufactured by Matsumoto Yushi Co., Ltd.). (F) Nylon powder such as "SP-500" (manufactured by Toray). (G) Crosslinked polystyrene powder such as "Fine Pearl SP-3000" (manufactured by Sumitomo Chemical Co., Ltd.). (H) Polyethylene powder such as "Flow Peas CL-4080F" (manufactured by Steel Manufacturing Co., Ltd.). (I) Lauroyl lysine such as "Amihope LL" (manufactured by Ajinomoto Co.).

The average particle size of these resin particles is 0.01 to 5
00 μm is preferred.

The inorganic substance used in the present invention is preferably an inorganic powder such as a metal oxide or a clay mineral, which is usually used in cosmetics, quasi drugs, external medicines and the like. The items shown in (a) to (h) are listed.

(A) Zinc oxide: Specific examples are "fine zinc white" (0.26 µ) and "SF-15" (0.18).
μ), “Finex-25” (0.04 μ), “Fin
ex-50 "(0.02μ) (above, Sakai Chemical Industry Co., Ltd.)
And the like. Further, as fine particle zinc oxide, JP-A-1-
Examples of the flaky zinc oxide include those described in JP-A-1-175921. (B) Talc: Specific examples thereof include "Talc SW Special", "Talc JA-46R" (above, manufactured by Asada Flour Milling Co., Ltd.) and the like. (C) Titanium oxide: As a specific example, "MT-500
B "," MT-600B "(manufactured by Teikoku Kako Co., Ltd.) and the like, and as fine particle titanium oxide, Japanese Patent Publication No. 1-135.
Examples thereof include those described in JP-A No. 11 (eg, "Taipeque" (manufactured by Ishihara Sangyo Co., Ltd.)). (D) Serisite: As an example, "Eight Pearl 30"
0S "(made by Kakuhachi Gyohaku Co., Ltd.) and the like. (E) Silica: Specific examples are "silica microbead P-400" and "silica microbead P-1500".
(These are manufactured by Catalysis Chemical Industry Co., Ltd.), "Esquartz M-1"
(Manufactured by Nippon Steel Chemical Co., Ltd.), “Sildex H-31” (manufactured by Asahi Glass Co., Ltd.) and the like. (F) Iron oxide. (G) Zirconium oxide. (H) Aluminum oxide.

The average particle size of the inorganic powder particles is 0.01 to
500 μm is preferred.

In order to coat the surface of the resin particles with the inorganic powder particles, various ball mills, ong mills, screen mills, pot mills, mortars, attritors, hybridizers (mixers using the high-speed air impact method ("Powder Engineering" Vol. 24, No. 9, pages 25-31, 1987),
Concrete example: "NHS-1" (manufactured by Nara Machinery Co., Ltd.) and the like are charged with resin particles and inorganic powder particles sufficiently mixed in advance,
Perform coating treatment. Peripheral speed during coating is 20-150m /
Seconds are preferable, and coating treatment time is preferably 1 to 30 minutes.

It is preferable that the surfaces of the resin particles are completely covered. The degree of coating can be observed with an electron microscope, and the optimal coating state can be determined according to the purpose.

The mixing ratio of the resin particles and the inorganic powder particles is
The content of the inorganic powder particles is preferably 0.5 to 1000% by weight (hereinafter simply referred to as “%”) with respect to the resin particles.
It is more preferably 500%.

The average particle size of the particles obtained by coating the surface of the resin particles thus obtained with an inorganic material (hereinafter sometimes referred to as composite powder) is preferably 0.01 to 500 μm, and 0.02 to
More preferably 100 μm.

Examples of the aqueous medium used in the present invention include water and a mixture of water and a monohydric alcohol such as methanol, ethanol and isopropanol, and glycerin.

The two-phase cosmetic of the present invention can be produced by dispersing the above composite powder in an aqueous medium according to a conventional method. The compounding amount of the composite powder in the cosmetic of the present invention is 0.
1 to 50% is preferable, and 1 to 25% is more preferable.

In addition to the above composite powder, the two-phase cosmetic composition of the present invention has other powders having the same average particle size, such as mica, talc, sericite, kaolin, zinc oxide, nylon powder, Silicone powder such as polymethylsilsesquioxane, acrylate copolymer, polyethylene powder, polyester powder, polystyrene powder, epoxy powder and the like can be used in combination.

Furthermore, in addition to the above-mentioned essential components, the two-phase type cosmetic composition of the present invention contains an anti-inflammatory agent, an antioxidant, an antiseptic agent, an ultraviolet absorbent, a fragrance, etc. within a range not impairing the effects of the present invention. Ingredients usually added to cosmetics can be added.

[0023]

EFFECTS OF THE INVENTION The two-phase cosmetic composition of the present invention is excellent in the effect of preventing greasiness, shine, makeup loss, etc. due to sebum, and moreover, the effect lasts for a relatively long period of time.

[0024]

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

Production Examples 1 to 5 The resin particles shown in Table 1 and the inorganic powder particles were thoroughly mixed and then charged into the production apparatus shown in Table 1 to produce composite powders under the production conditions shown in Table 1. (Production Examples 1 to 5).

[0026]

[Table 1]

It was confirmed by electron microscope observation that the surface of each of the obtained composite powders was completely covered with the inorganic powder.

Examples 1-5 and Comparative Examples 1-2 Two-phase cosmetics having the compositions shown in Table 2 were produced by a conventional method.
With respect to each of the obtained samples, the dispersion state, redispersibility, and feeling of use (greasiness, squeak, makeup loss, etc.) were evaluated according to the following criteria. Regarding the feeling of use, the average value of sensory evaluations by 10 professional panelists was adopted. The evaluation results are also shown in Table 2.

(Evaluation Criteria) (1) Dispersed state of powder (stationary state): ◯: Powder uniformly dispersed or settled in the liquid in a stationary state, Δ: Partially floated powder, ×; The powder floats. (2) Redispersibility of powder: ◯: The powder was uniformly dispersed when the container was shaken several times, Δ: The powder was partially aggregated even when the container was shaken several times, ×: The container was shaken several times The powder agglomerates even when shaken. (3) Sticky feeling: ◯: Not sticky when applied to the skin, Δ: Slightly sticky when applied to the skin, ×: Sticky when applied to the skin (4) Squeaky feeling: ◯: Does not squeak when applied to the skin, Δ: Slightly squeaks when applied to the skin, ×: Squeaks when applied to the skin. (5) Disappearance of makeup: (Feeling after applying makeup to the face and performing normal work for half a day) ○: No discoloration of makeup, △: Slight discoloration of makeup, ×: Discoloration of makeup.

[0030]

[Table 2]

As shown in Table 2, the products of the present invention (Examples 1 to 1)
5) was far superior in the dispersed state and the feeling of use, as compared with the powder using only dimethylpolysiloxane polymer particles (Comparative Example 1) and the powder using only zinc oxide particles (Comparative Example 2). It turns out to be a thing.

Claims (1)

[Claims] 1. A two-phase cosmetic comprising a powder obtained by coating the surface of a resin with an inorganic substance and an aqueous medium.