JPH11228336A - Solid powder cosmetic and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic having a high strength, good shape retainability and good impact resistance and giving an excellent touch by compounding the powder of a specific thermoplastic resin powder arid a powdery material for the cosmetic and subsequently fusing the resin powder. SOLUTION: This solid powder cosmetic is obtained by compressing and molding a composition comprising (A) 5-80 wt.% of thermoplastic resin (for example, polystyrene) powder having an average particle diameter of 0.01-30 μm and (B) a powdery material (for example, talc) for the cosmetic preferably in an amount of <=95 wt.%, and subsequently thermally treating the molded product preferably at a 50-25 deg.C for 1-720 min to melt and fuse the thermoplastic resin powder to the powder for the cosmetic. The cosmetic may, if necessary, further be compounded with (C) an oily component (for example, petrolatum) in an amount of <=90 wt.%.

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 which has high strength, good shape retention and impact resistance, and is excellent in use feeling, and a method for producing the same.

[0002]

2. Description of the Related Art
In solid powder cosmetics, the oil content must be 5-30% in order to improve its moldability, so that it has poor usability such as oily and poor stickiness, and has large drawbacks over time. was there. Also, in addition to oil, a large amount of powder having good moldability (talc, kaolin, metal soap, etc.) must be compounded, and there are problems in terms of gloss and transparency, and low impact resistance. there were.

Japanese Patent Application Laid-Open No. 8-165221 discloses an example in which a thermoplastic resin powder such as polymethyl methacrylate is used as a binder for the purpose of improving the usability and moldability of a solid powder cosmetic. However, the moldability of the cosmetic obtained by this method was not sufficiently satisfactory. Also, a method has been reported in which a clay mineral such as bentonite or smectite is blended in addition to the powder for cosmetics in order to obtain a rod-shaped cosmetic, and the mixture is heated and fired at a high temperature of 300 to 1000 ° C. 188518)
However, this cosmetic has the drawback that it is not economical due to the high heating temperature, and is further deteriorated when an organic substance or the like is added.

Accordingly, an object of the present invention is to provide a method for producing a solid powder cosmetic which has high strength, good shape retention and impact resistance, and is excellent in usability.

[0005]

In view of such circumstances, the present inventors have conducted intensive studies and have found that a specific amount of a thermoplastic resin powder having a specific particle diameter is blended into a cosmetic powder, followed by compression molding. If heated, the thermoplastic resin partially fuses and acts as a binder, so that solid powder cosmetics with high strength, good shape retention, impact resistance, and excellent usability can be obtained. 3
The present inventors have found that they can be easily manufactured without processing at a temperature as high as 00 ° C. or more, and have completed the present invention.

[0006] That is, the present invention provides an average particle size of 0.01 to 3
A solid powder cosmetic containing 5-80% by weight of a 0 μm thermoplastic resin powder and a cosmetic powder, wherein the thermoplastic resin is fused, and a method for producing the same. is there.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The thermoplastic resin used in the present invention is not particularly limited, but the monomers constituting the thermoplastic resin include, for example, acrylic acid, methacrylic acid and itacone as hydrophilic monomers. Ethylenically unsaturated carboxylic acids such as acids, maleic acid, fumaric acid, crotonic acid; hydroxyethyl acrylate, hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, polyethylene glycol monoacrylate, polyethylene glycol Hydroxy group-containing ethylenic monomers such as monomethacrylate; acrylamide, methacrylamide, N-methylol acrylamide, N-methylol methacrylamide, N-diacetone acryl Ethylenic amides such as amide; aminoethyl acrylate, aminoethyl methacrylate,
N, N-dimethylaminoethyl acrylate, N, N-
Ethylenic amines such as dimethylaminoethyl methacrylate, N, N-diethylaminoethyl acrylate, N, N-diethylaminoethyl methacrylate, N, N, N-trimethylaminoethyl acrylate, N, N, N-trimethylaminoethyl methacrylate and salts thereof And the like.

[0008] As the hydrophobic monomer, styrene,
aromatic mono- and divinyl compounds such as α-methylstyrene, chlorostyrene, alkylstyrene and divinylbenzene; methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate Acrylates and methacrylates such as 2-ethylhexyl methacrylate, tertiary butyl acrylate, tertiary butyl methacrylate, cyclohexyl acrylate and cyclohexyl methacrylate; vinyl cyanide compounds such as acrylonitrile and methacrylonitrile; vinyl esters such as vinyl acetate; Vinyl halides such as vinyl chloride and vinylidene chloride; Methacrylate, 2,2,3,
3-tetrafluoropropyl methacrylate, 2,2
Examples include fluorine-based monomers such as 3,3,4,4-hexafluoropropyl methacrylate, perfluorooctyl methacrylate, and perfluorooctyl acrylate.

The thermoplastic resin can be produced from these monomers by a conventional method. In addition to a homopolymer in which one kind of monomer is polymerized, a random or block copolymer in which two or more kinds of monomers are copolymerized. However, it is preferable to use polymethyl methacrylate, polyethyl methacrylate, polystyrene, or the like.

The weight average molecular weight of the thermoplastic resin is 3,000
It is preferably from 0 to 2,000,000, and particularly preferably from 20,000 to 1,000,000.

[0011] The thermoplastic resin powder used in the present invention comprises:
Such a thermoplastic resin is in the form of a powder and has an average particle size of 0.01 to 30 μm, but 0.05 to 20 μm.
μm is preferable, and 0.05 to 10 μm is more preferable.
If the average particle size is less than 0.01 μm, the usability is lowered, and
If it exceeds μm, a sufficient strength improving effect cannot be obtained.

The thermoplastic resin powder is blended in an amount of 5 to 80% by weight, preferably 5 to 60% by weight, and more preferably 5 to 40% by weight, based on the whole composition. If it is less than 5% by weight, a sufficient strength improving effect cannot be obtained, and 80% by weight.
If it exceeds, the usability decreases.

As the powder for cosmetics, powders used in ordinary cosmetics, for example, silicic acid, silicic anhydride, magnesium silicate, talc, sericite, kaolin, red iron oxide,
Mica, clay, bentonite, zirconium oxide, magnesium oxide, zinc oxide, titanium oxide, titanium mica,
Aluminum oxide, calcium sulfate, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate,
Iron oxide, ultramarine, chromium oxide, chromium hydroxide, calamine,
Inorganic powders such as carbon black and their composites; polyamides, polyesters, polyurethanes, vinyl resins,
Urea resin, phenolic resin, fluororesin, silicon resin,
Melamine resin, epoxy resin, polycarbonate resin,
Organic powders such as silk powder, cellulose, and composites of these; further, these are coated and encapsulated with color pigments, dyes, dyes, metal ions, and the like; organic tar dyes, organic colorants such as lakes, and the like. Can be blended.
These powders use a surfactant, silicone,
It may be treated with metal soap, lecithin, amino acid, collagen, synthetic polymer, fluorine compound and the like.
When the cosmetic is a makeup cosmetic or the like, it is preferable to mix an inorganic powder such as talc, sericite, kaolin, titanium oxide, mica, mica titanium and iron oxide.

It is preferable that these cosmetic powders are blended in an amount of 95% by weight or less, particularly 20 to 95% by weight, based on the total composition.

In the method for producing a solid powder cosmetic according to the present invention, a composition containing a thermoplastic resin powder and a cosmetic powder is compression-molded and then heat-treated. From the viewpoint of melting the thermoplastic resin powder to fuse the cosmetic powder, and the stability of the obtained cosmetic to temperature changes and the stability of various raw materials during production, 50
-250 ° C is preferred, 50-180 ° C is more preferred, and 70-150 ° C is particularly preferred. The heating time varies depending on the treatment temperature, but from the viewpoint of uniform heat treatment and the stability of various raw materials, it is 1 to 720 minutes, especially 5 to 12 minutes.
0 minutes is preferred.

Further, in the present invention, in addition to the above-mentioned powder components, oils used in ordinary cosmetics such as petrolatum, lanolin, ceresin, microcrystalline wax, carnauba wax, candelilla wax, higher fatty acids Solid and semi-solid oils such as oils and higher alcohols; liquid oils such as squalane, liquid paraffin, ester oils, diglycerides, triglycerides, silicone oils;
Fluorinated oils such as perfluoropolyether, perfluorodecalin and perfluorooctane can be blended.

The amount of these oils varies depending on the desired form of the cosmetic, but is not more than 90% by weight, especially 60% by weight.
% By weight or less.

If necessary, a thermosetting resin, a surfactant, ethanol, an antiseptic, an antioxidant, a dye, a thickener, a pH adjuster, a fragrance, an ultraviolet absorber, a humectant, a blood circulation promoter, A cooling sensation, an antiperspirant, a bactericide, a skin activator, and the like can be appropriately compounded within a range that does not impair the effects of the present invention.

In order to carry out the production method of the present invention, the components are uniformly mixed, compression-molded into a desired shape, and then heat-treated at the above-mentioned temperature. Here, the compression molding is performed by using the composition as an eye shadow, a blusher, a foundation,
After putting into a desired solid powder cosmetic such as an eyeliner or lipstick, it may be compressed.

[0020]

According to the present invention, it is possible to obtain a solid powder cosmetic which has high strength, good shape retention and impact resistance, and is excellent in use feeling.

[0021]

Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Example 1 Powder cosmetics having the compositions shown in Table 1 were prepared, and the samples before and after heating were evaluated for drop strength and hardness. Table 2 shows the results.

(Preparation method) The powder components (1) and (2) were mixed using a Henschel mixer, and the oil (3) was added thereto and further mixed. After compression molding on a middle plate, 120
Heat treatment was performed at 30 ° C. for 30 minutes.

(Evaluation method) Drop strength: The powder cosmetic was dropped on a concrete floor from a height of 30 cm, and the number of times until the cosmetic was damaged such as cracking, chipping or the like was measured. One sample was measured at three locations, and the average value was shown. Hardness: Using an Olsen hardness tester (manufactured by Ueshima Seisakusho), three samples were measured for each sample, and the average value was shown.

[0025]

[Table 1]

[0026]

[Table 2]

As is clear from the results in Table 2, at 120 ° C.
The heat-treated powder cosmetic had high strength and moderate hardness as compared with that before heating, and had good shape retention and impact resistance. Further, when the inside of the cosmetic was observed with a scanning electron microscope, it was confirmed that the powder for the cosmetic was fused with the thermoplastic resin.

Example 2 An eye shadow having the composition shown in Table 3 was produced and evaluated for strength and feeling of use. Table 3 shows the results.

(Preparation method) The powder components (1) to (7) are mixed using a Henschel mixer, and the components (8) to (7) are mixed.
(11) was added and further mixed. This was compression-molded into a middle plate and then heat-treated at 120 ° C. for 30 minutes.

Drop strength: When the powder cosmetic is dropped on a concrete floor from a height of 30 cm, the cosmetic cracks,
The number of times until breakage such as chipping was measured, and evaluated according to the following criteria. ；: 10 times or more △: 3 times or more, less than 10 times ×: less than 3 times

Feeling of use: Ten expert panelists evaluated the feeling of use of the powder cosmetics as 2 points for good, 1 point for normal, and 0 point for poor, and the average of the points was based on the following criteria. expressed. ；: 1.5 or more △; 0.8 or more, less than 1.5 ×: less than 0.8

[0032]

[Table 3]

As is clear from the results in Table 3, the comparative product was inferior in strength or usability, but the product of the present invention had high strength and was excellent in usability.

Example 3 A blusher having the composition shown in Table 4 was produced and evaluated for drop strength and feeling of use in the same manner as in Example 2. Table 4 shows the results.

(Preparation method) The powder components (1) to (6) were mixed using a Henschel mixer, and the components (7) and (8) were added thereto and further mixed. After compression-molding this into a middle plate, it was heated at a predetermined temperature shown in Table 4 for 30 minutes.

[0036]

[Table 4]

As is evident from the results in Table 4, the product of the present invention had higher strength than the comparative product and was excellent in usability. Further, when the interior of the cosmetic was observed with a scanning electron microscope, Comparative Product 3 heat-treated at 40 ° C. showed no fusion of thermoplastic resin powder, but the present invention heat-treated at 120 ° C. In product 2, it was confirmed that the cosmetic powder was fused with the thermoplastic resin.

Example 4 A foundation having the composition shown in Table 5 was produced.

[0039]

[Table 5]

(Preparation method) The powder components (1) to (7) are pulverized through a pulverizer. Transfer the powder components to a high-speed blender,
Binders (8) to (10) and preservative (11) are added and mixed uniformly. This is treated with a crusher and passed through a sieve to make the particle size uniform. After compression molding in a metal pan,
Heat treatment was performed for minutes to obtain the desired foundation.

Continued on the front page (72) Inventor Susumu Kadowaki 2-1-3 Bunka, Sumida-ku, Tokyo Kao Corporation (72) Inventor Yoshiko Tajima 2-1-3 Bunka, Sumida-ku, Tokyo Kao Corporation

Claims (4)

[Claims] 1. A thermoplastic resin powder comprising 5 to 80% by weight of a thermoplastic resin powder having an average particle size of 0.01 to 30 μm and a powder for cosmetics, wherein the thermoplastic resin powder is fused. Solid powder cosmetics. 2. The solid powder cosmetic according to claim 1, which contains an oil component. 3. A composition comprising 5-80% by weight of a thermoplastic resin powder having an average particle size of 0.01-30 μm and a powder for cosmetics, which is subjected to heat treatment after compression molding. Item 3. The method for producing a solid powder cosmetic according to item 1 or 2. 4. The method for producing a solid powder cosmetic according to claim 3, wherein the heat treatment temperature is 50 to 250 ° C.