JP2001002522A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic having excellent adhesion and spread on the skin, a natural finish, making the unevenness of the skin invisible and yet keeping these effects for many hours by making the cosmetic include specific spherical powder, a film-forming agent, a liquid oil agent and water and have specific viscoelasticity. SOLUTION: This cosmetic comprises (A) spherical powder having >=3 μm average particle diameter (e.g. silica, zeolite, barium sulfate, alumina, silicone resin, divinylbenzene/styrene copolymer, etc.), (B) a film-forming agent, preferably a polysiloxane elastomer, etc., (C) a liquid oil agent (e.g. squalane, etc.), and/or (D) water and has 500-100,000 N/m complex modulus of elasticity G* and 0.1-1 dissipation factor tanδ at 1% strain. The cosmetic comprises 20-60 wt.% of the component A and 0.01-60 wt.% of the component B in the whole composition and 50-100 pts.wt. of the component C based on 100 pts.wt. of the component A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a natural finish with good adhesion and elongation on the skin, which makes it possible to make the unevenness of the skin difficult to see, and the effect lasts for a long time, so that the feeling of use is good. Liquid cosmetics.

[0002]

2. Description of the Related Art Hitherto, attempts have been made to use the optical properties of extenders as cosmetics for making skin unevenness due to wrinkles, fine lines, pores, etc. difficult to see (Japanese Patent Application Laid-Open No. 4-364105,
JP-A-3-5412, JP-A-3-81411, JP-A-4-364105
No., JP-A-6-279235, JP-A-7-277925, JP-A-7-31
No. 6014, JP-A-8-73316, JP-A-8-73317, JP-A-8-733
267135, JP-A-8-217636, etc.). Many of them mix a powder having a high refractive index, such as titanium oxide or alumina, or a spherical powder to scatter light so as to make unevenness difficult to see.

[0003] However, these cosmetics suffer from problems such as the whitening of the applied portion, the appearance of wrinkles when the extender is accumulated in the wrinkles, an unnatural finish, and the effect not being maintained for a long time. there were. Further, when a foundation is applied thereon, the effect of making the unevenness inconspicuous disappears, or the finish may become dirty.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a natural finish with good adhesion and elongation on the skin, to make it difficult to see unevenness on the skin, and to maintain the effect for a long time. An object of the present invention is to provide a cosmetic having a good feeling in use.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have developed a liquid cosmetic containing a specific spherical powder and a film-forming agent and having a specific viscoelasticity as a liquid when applied to the skin. Can be arranged on the skin with an appropriate thickness, thereby improving the effect of efficiently scattering light and making the skin unevenness less visible. In addition, this cosmetic has good stickiness and elongation on the skin, has a natural finish, has excellent effect persistence, and has a good feeling in use.

The present invention contains a spherical powder having an average particle size of 3 μm or more, a film-forming agent, a liquid oil and / or water, and has a complex elastic modulus G ^* at 500 ° C. and a strain of 1% at 25 ° C. of 500 to 100,000 N.
/ M ² , and a liquid cosmetic having a loss tangent tan δ of 0.1 to 1.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The spherical powder used in the present invention has an average particle size of 3 μm or more, preferably 3 to 30 μm, particularly preferably 3 to 15 μm. If the average particle size is less than 3 μm, the effect of making the unevenness difficult to see is not sufficient. Here, the average particle diameter of the powder indicates the volume average particle diameter, that is, the average value of the diameter of the sphere corresponding to the volume of the measured particles. For powders of 1 μm or more, a value obtained by using a laser diffraction method and for a powder of less than 1 μm by a laser scattering method using ethanol as a dispersion medium is used. In the present invention,
The spherical shape includes a substantially spherical shape except for a rod shape and a plate shape. Further, not only spherical primary particles, but also spherical aggregates or composites are included.

[0008] The spherical powder may be any powder used in ordinary cosmetics. For example, inorganic powders such as silica, zeolite, barium sulfate, boron nitride, alumina, and titanium oxide; silicone resin, polyethylene resin, urethane resin, poly (meth) acrylic acid copolymer, and poly (meth)
Acrylic ester-based copolymer, polyamide, polyester, polypropylene, polystyrene, urea resin, phenol resin, fluororesin, melamine resin, epoxy resin, polycarbonate resin, divinylbenzene / styrene copolymer, silk powder, cellulose, monoalkyl phosphorus Organic powders such as zinc oxide; coloring pigments such as iron oxide, zinc oxide, and chromium oxide; powders containing cosmetic oils, ultraviolet absorbers, etc., and composites of these powders And the like.

The spherical powder may be subjected to a surface treatment such as a hydrophobic treatment. As the hydrophobic treatment, for example,
Examples include those obtained by subjecting the spherical powder to a surface treatment with a silicone, a higher fatty acid, a higher alcohol, a fatty acid ester, polyethylene, metal soap, an amino acid, an alkyl phosphate, a fluorine compound, or the like by an ordinary method. In particular,
Silicone treatment and fluorine compound treatment are preferred.

One or more types of spherical powder can be used,
20 to 60% by weight in the total composition, especially 25 to 60% by weight,
Further, it is preferable to add 30 to 55% by weight because the effect of making the skin unevenness less visible can be sufficiently obtained. In addition, powders used for ordinary cosmetics other than these spherical powders can also be appropriately used as long as the effects of the present invention are not impaired.

The film-forming agent used in the present invention is not limited as long as it can impart desired liquid viscoelasticity together with the above-mentioned spherical powder and liquid component and can form a film after coating and drying on skin. , Solid fats, semi-solid fats, and water-soluble or oil-soluble film-forming polymers.
Among these, a film-forming polymer such as a polysiloxane elastomer is preferable. A polysiloxane elastomer is a polysiloxane having a crosslinked structure and exhibits remarkable viscoelastic properties. Crosslinking between polysiloxane chains includes not only covalent bonds of siloxane chains, methylene chains, peptide chains and the like, but also hydrophobic or hydrophilic intermolecular forces. Examples of the polysiloxane elastomer having a crosslink by a bond other than a covalent bond include, for example,
No. 133352, JP-A-10-95705, etc., preferably, at the terminal or side chain of the organopolysiloxane segment, via a linking group, formed by ring-opening polymerization of an oxazoline compound or an oxazine compound. , The following general formula (1):

[0012]

Embedded image

(Wherein R ¹ is a hydrogen atom, having 1 to 22 carbon atoms)
Represents an alkyl group, a cycloalkyl group, an aralkyl group or an aryl group, and n represents a number of 2 or 3.) An organopoly obtained by bonding a poly (N-acylalkyleneimine) segment comprising a repeating unit represented by the following formula: Siloxane. These not only show high elasticity,
Since it has high adhesiveness to the skin, it shows a good feeling of use, which is preferable.

Commercially available polysiloxane elastomers include KSG6 (manufactured by Shin-Etsu Silicone Co., Ltd.) and Trefil (manufactured by Dow Corning Toray). KSG15, KSG16, KSG17, KSG18 (all manufactured by Shin-Etsu Silicone), Gransil SR 5CYC gel, Gransil SR
DMF10 gel, Gransil SR DC 556 gel, SF1204, JK113
(Above, manufactured by General Electric).

One or more film-forming agents can be used, and 0.01 to 60% by weight, particularly 0.01 to 60% by weight in the total composition.
It is preferable to mix 40% by weight, more preferably 0.1 to 20% by weight, from the viewpoint of a sufficient feeling as well as feeling of use.

The liquid cosmetic of the present invention further contains a liquid oil and / or water. As the liquid oil agent, a nonvolatile oil component is preferable. For example, hydrocarbon oils such as squalane and liquid paraffin; isostearyl myristate, isotridecyl nonanoate, neopentyl glycol dicaprate, dipentaerythot hexaoxystearate, triisostearate triisostearate Ester oils such as methylolpropane, isostearyl isostearate, diisostearyl malate, stearyl methacrylate, N-lauroyl-L-glutamate di (cholesteryl, octyldodecyl), octyl paramethoxycinnamate; castor oil, jojoba oil,
Animal and vegetable oils such as macadamian nut oil, evening primrose oil, olive oil, peppermint oil and liquid lanolin; silicone oils such as dimethylpolysiloxane and methylphenylpolysiloxane;
Fluorinated oils such as perfluoropolyether and fluorine-modified silicone; alcohols, polyols, diglycerides, triglycerides and the like.

One or more of these oils can be used, and 50 to 100 parts by weight, particularly 60 to 90 parts by weight, and more preferably 65 to 85 parts by weight are mixed with 100 parts by weight of the powder component. It is preferable because a sufficient effect and a good finish can be obtained.

Water is 3 to 30% by weight in the total composition,
In particular, it is preferable to add 3 to 20% by weight, more preferably 5 to 15% by weight, in order to maintain a good feeling in use.

In the cosmetic of the present invention, in addition to the above-mentioned components, components used in ordinary cosmetics, for example, surfactants, ethanol, humectants, cooling agents, antiperspirants, ultraviolet absorbers, ultraviolet scattering. Agent, powder other than the above, polymer compounds other than the above,
Thickeners, antioxidants, preservatives, bactericides, pH adjusters, vitamins, blood circulation promoters, whitening agents, skin activators, medicinal agents, extracts from animals and plants, pigments, fragrances, and the like can be appropriately compounded.

The liquid cosmetic of the present invention has a temperature of 25 ° C. and a strain of 1%.
Complex elastic modulus G ^* is 500 to 100,000 N / m ² , preferably 1000
550,000 N / m ² , particularly preferably 5,000 to 30,000 N / m ² , and a loss tangent tan δ of 0.1 to 1, preferably 0.1 to 0.5, particularly preferably 0.1 to 0.2. When G ^* is 500 N / m ² or less than tanδ exceeds 1, it is impossible to maintain a constant film thickness when applied, is not sufficient effect of reducing the visibility of irregularities, G ^* is
If it exceeds 100000 N / m ² or tan δ is less than 0.1, the feeling of use will be poor. In the present invention, the dynamic viscoelasticity was measured using a liquid viscoelasticity measuring apparatus RFS-II (manufactured by Rheometrics), using a cone plate method (diameter 25 mm), and a frequency ω.
= 6.28 rad / s, drive angle θ = 0.01 to 10 rad, and cone angle β = 0.1 rad. Note that the strain γ is γ = (θ /
β) × 100%.

The liquid cosmetic composition of the present invention preferably has a film thickness of 20 to 50 μm when applied to the skin, because it has a natural finish and has a sufficient effect of making unevenness difficult to see. In the following examples, a model coating film was prepared and the film thickness was measured. That is, 250 mg of liquid cosmetics is placed on a glass plate with a smooth surface (surface roughness Ra 0.4 μm or less).
Measure and apply using a urethane cloth. During application, a load of 200 g is applied to the urethane cloth, and the urethane cloth is reciprocated three times at a distance of 6 cm. After drying overnight at 25 ° C., the thickness of the coating film is measured using a scanning laser microscope 1LM21 (manufactured by Lasertec).

The cosmetic of the present invention can be produced according to a usual method and is in a liquid form, for example, a makeup cosmetic such as a foundation, concealer, blush, eye shadow and the like. Further, the part to be used is not limited to the face, and can be applied as a body cosmetic used for the neck, hands, feet and the like.

[0023]

EFFECT OF THE INVENTION The cosmetic composition of the present invention has good stickiness and elongation on the skin, has a natural finish, can make skin unevenness due to wrinkles, fine lines, pores, etc. difficult to see, and has a long effect. It lasts for a long time and has excellent usability.

[0024]

EXAMPLES Example 1 A liquid foundation having the composition shown in Table 1 was produced, and when this was used, the film thickness, finish, persistence of the cosmetic effect,
And the feeling of use. Table 1 shows the results.

(Preparation method) First, after a powder component and an oil component are roughly mixed, an aqueous dispersion of the silicone elastomer 5 is added thereto with stirring, and 3000 r / r using a ROBO MICS high-speed stirrer.
The mixture was mixed for 5 minutes at min to obtain a foundation.

(Evaluation method) (1) Film thickness: The film thickness was measured by the method described above.

(2) Finish: The finish when each foundation was applied to the face, that is, wrinkles, fine lines, and unevenness of the skin due to pores, was evaluated by five expert panelists according to the following five grades. The average score is calculated and the average score is 4
The above was evaluated as “◎”, 3 to less than 4 as “○”, 2 to 3 or less as “△”, and 2 or less as “×”. 5: Almost inconspicuous. 4: Not very noticeable. 3: Neither can be said. 2: Stand out. 1: Very noticeable.

(3) Sustainability of cosmetic effect: The sustainability of the cosmetic effect when the foundation was applied to the face was measured by 10 expert panelists as "the effect persists 2 hours after application" and "applied." The effect disappears in 2 hours. "
It was evaluated on a scale. As a result, the number of panelists who evaluated that “the effect persists 2 hours after application” was “◎” for 8 to 10 persons, “○” for 6 to 7 persons, “△” for 4 to 5 persons. , 0
Three persons were judged as "x".

(4) Feeling of Use: The feeling of use (elongation, stickiness) when each foundation was applied to the face was evaluated by the following five levels by ten expert panelists. The average score was determined, and the average score was judged as “◎” when the average score was 4 or more, “○” when less than 3-4, “△” when less than 2-3, and “x” when less than 2. 5: Very good. 4: Good. 3: Neither can be said. 2: Somewhat bad. 1: Bad.

[0030]

[Table 1]

Claims (2)

[Claims] Claims 1. A spherical powder having an average particle diameter of 3 µm or more, a film-forming agent, and a liquid oil and / or water.
A liquid cosmetic having a complex elastic modulus G ^* at a strain of 1% of 500 to 100,000 N / m ² and a loss tangent tan δ of 0.1 to 1. 2. The cosmetic according to claim 1, wherein the film forming agent is a polysiloxane elastomer.