JPH1036219A - Cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cosmetic which is excellent in spreadability on hand skin and application feeling by using a specific hardened silicone powder. SOLUTION: As a hardened silicone powder, is used a hardened silicone composite powder which is prepared by coating a hardened silicone powder containing noncrosslinked oil with an inorganic fine particles on its surface. The noncrosslinked oil is preferably a silicone oil and its content is preferably 0.5-80wt.%, particularly 10-80wt.% based on the hardened silicone powder. The inorganic fine particle is preferably a metal oxide fine particle, for example, silicon oxide or titanium oxide. The hardened silicone powder is preferably a silicone rubber powder. The hardened silicone powder is most preferably produced by preparing spherical hardened silicone powder which contains noncrosslinked oil and a surfactant and has excellent dispersion in an organic resin and dispersing the powder in a surfactant aqueous solution and curing the dispersed powder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to cosmetics, and more particularly to cosmetics comprising a cured silicone powder as a component.

[0002]

2. Description of the Related Art It is well known to use a cured silicone powder as a component of cosmetics, and the surface of the powder is used to impart ultraviolet absorption to the powder or to improve the dispersibility of the powder in cosmetics. Cosmetics comprising a composite cured silicone powder obtained by coating the composition with an inorganic fine powder are also well known. As such a cosmetic, for example, a particle size of 1
The surface of the cured silicone powder having a particle size of 0.
Cosmetics comprising a composite cured silicone powder coated with titanium oxide, iron oxide and other pigments of 1 to 0.001 μm (see JP-A-63-27410 and JP-A-63-68513) ) And a cosmetic comprising a composite cured silicone powder obtained by coating the surface of a cured silicone powder with an inorganic powder (see JP-A-6-1709). Further, in order to impart a good feeling of use to cosmetics, the content of silicone oil is 0.5%.
Cosmetics containing a cured silicone powder of up to 80% by weight as a component are also known (see JP-A-2-243612).

[0003] However, even with cosmetics containing these cured silicone powders as ingredients, the resulting cosmetics cannot be sufficiently spread on the hand skin, and a feeling of foreign matter or creaking is felt. And the elongation of the cosmetic to the hand skin and the feeling of use were not satisfactory. Further, there is a problem that these cured silicone powders cannot be uniformly dispersed in an aqueous or oily cosmetic.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have made intensive studies to solve the above-mentioned problems, and have reached the present invention. That is, an object of the present invention is to provide a cosmetic that is excellent in elongation to the hand skin and excellent usability.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a cosmetic comprising a composite cured silicone powder obtained by coating the surface of a cured silicone powder containing a non-crosslinked oil with a fine inorganic powder.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The cosmetic of the present invention will be described in detail. The cosmetic of the present invention is a cosmetic containing a cured silicone powder as a component, and examples of the dosage form include aqueous or oily liquids, emulsions, pastes, waxes, powders, and solids. Can be Examples of such cosmetics include basic cosmetics such as lotion, cold cream, cleansing cream, milky lotion, and serum; makeup cosmetics such as foundation, compact, eye shadow, and nail polish.

[0007] The cosmetic of the present invention is characterized in that, as the cured silicone powder as this component, a composite cured silicone powder obtained by coating the surface of a cured silicone powder containing a non-crosslinked oil with an inorganic fine powder is used. And The non-crosslinked oil is an oil that is simply contained in the cured silicone powder and that naturally oozes out of the powder or that can be extracted with an organic solvent. As the oil, for example, when previously contained in a curable silicone composition for forming the cured silicone powder, a dimethylpolysiloxane capped at both molecular chains at both ends with a trimethylsiloxy group that does not participate in the curing reaction, Non-reactive silicone oils such as polysiloxanes in which some of the methyl groups of the dimethylpolysiloxane are substituted with alkyl groups other than the methyl groups, phenyl groups, and 3,3,3-trifluoropropyl groups; In the case of a reaction, in addition to the non-reactive silicone oil, a dimethylpolysiloxane having silanol groups at both molecular chain terminals, a part of the methyl group of the dimethylpolysiloxane is an alkyl group other than a methyl group, a phenyl group, Silicone oil such as polysiloxane substituted with 3,3,3-trifluoropropyl group, Further, dimethylpolysiloxane capped with dimethylvinylsiloxy groups at both ends of the molecular chain, which may be involved in this curing reaction but remained as unreacted, dimethylsiloxane / methylvinylsiloxane copolymer with capped trimethylsiloxy groups at both molecular chains, Dimethyl hydrogensiloxy group-blocked dimethylpolysiloxane at both chain ends, trimethylsiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymer at both molecular ends, some of the methyl groups of these polysiloxanes are alkyl groups other than methyl groups,
Phenyl group, silicone oil such as polysiloxane substituted with 3,3,3-trifluoropropyl group, and when the curing reaction is a condensation reaction, in addition to the non-reactive silicone oil, A silicone oil such as a polysiloxane in which a part of methyl groups of the silicone oil are substituted with an alkenyl group, and a dimethylpolysiloxane capped with silanol groups at both ends of a molecular chain which may be involved in the curing reaction but remain unreacted. A silicone oil in which a part of the methyl group of the polysiloxane is substituted with an alkyl group other than the methyl group, an alkenyl group, a phenyl group, or a 3,3,3-trifluoropropyl group; Liquid paraffin, hexyl laurate, isopropyl myristate, myristo myristate Cetyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, butyl stearate, decyl oleate, 2-octyldodecyl oleate, myristyl lactate, cetyl lactate, lanolin acetate, stearyl alcohol, Cetostearyl alcohol, oleyl alcohol, avocado oil, almond oil,
Olive oil, cacao oil, jojoba oil, sesame oil, safflower oil, soybean oil, camellia oil, squalane, persic oil, castor oil, mink oil, cottonseed oil, coconut oil, egg yolk oil, tallow, lard, polypropylene glycol monooleate, Glycol ester oils such as neopentyl glycol-2-ethylhexanoate; isostearic acid triglyceride;
Polyhydric alcohol ester oils such as coconut oil fatty acid triglyceride; and oil agents such as polyoxyalkylene ether oils such as polyoxyethylene lauryl ether and polyoxypropylene cetyl ether. When the cured silicone powder is impregnated with a non-crosslinked oil, the type of the oil is not limited. These oils are preferably silicone oils. These oils are liquid, and the viscosity at 25 ° C is 1 to
It is preferably 100,000 centipoise, more preferably 5 to 50,000 centipoise, and particularly preferably 5 to 10,000 centipoise. This is because if the viscosity is less than this range, it tends to volatilize from the cured silicone powder or easily ooze out, making it difficult to impart good elongation to the skin and a feeling of use to the cosmetic, This is because, even if it is larger than this range, it tends to be difficult to impart good elongation to the hand skin and a feeling of use to the cosmetic.

The content of the oil is preferably 0.1 to 80% by weight of the cured silicone powder, more preferably 0.5 to 80% by weight, and further preferably 1 to 80% by weight. %, Preferably 2 to 80% by weight, more preferably 5 to 80% by weight, and particularly preferably 10 to 8% by weight.
It is preferably 0% by weight. This is because if the content is less than this range, it tends to be difficult to impart good elongation to the skin and a feeling of use to cosmetics containing the cured silicone powder as a component, while if it exceeds this range, This is because the mechanical strength of the cured silicone powder becomes poor, and the powder tends to break when preparing a cosmetic.

[0009] The particle size of the cured silicone powder may be the same as the particle size of the cured silicone powder or other organic resin powder or inorganic powder known as a component of cosmetics. Particle size 0.1 ~
It is preferably 500 μm, particularly 0.5 to 20 μm.
It is preferably 0 μm. This is because when the average particle size is smaller than this range, the handling operability of the cured silicone powder tends to decrease, while when the average particle size is larger than this range, the cured silicone powder tends to be hardly uniformly dispersed in the cosmetic. Because there is. Examples of the cured silicone powder include a silicone gel powder, a silicone rubber powder, and a silicone resin powder, and are preferably silicone rubber powder because they can impart good elongation to the hand and a feeling of use to cosmetics. JIS
It is preferably a silicone rubber powder having an A hardness of less than 90, and particularly preferably a silicone rubber powder having a JIS A hardness of 10 to 80. Examples of the cured silicone powder include those obtained by curing an addition-curable, condensation-curable, radical-reactive curable organic peroxide, and ultraviolet-curable silicone composition. It is preferably formed by curing a reaction-curable or condensation-curable silicone composition.

As a method for preparing the cured silicone powder, for example, a method in which a non-crosslinked oil is previously contained in a curable silicone composition for forming the cured silicone powder, and the composition is cured Examples include a method of impregnating the cured silicone powder with a non-crosslinked oil, and the former method is particularly preferable. As the former method, for example, an organopolysiloxane having at least two alkenyl groups in one molecule, an organopolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, a silicone oil not participating in an addition reaction And an addition-curable silicone composition comprising a platinum-based compound; a hydroxyl group or an alkoxy group, an oxime group bonded to at least two silicon atoms in one molecule;
Organopolysiloxane having hydrolyzable groups such as acetoxy group and aminoxy group, silane having hydrolyzable groups such as alkoxy group, oxime group, acetoxy group and aminoxy group bonded to at least 3 silicon atoms in one molecule Silicone obtained by curing a curable silicone composition such as a condensation reaction curable silicone composition comprising a system crosslinking agent, a silicone oil not involved in the condensation reaction, and a condensation reaction catalyst such as an organotin compound and an organotitanium compound. A method of grinding the cured product with a grinder such as a grinder,
A method of spraying and curing these curable silicone compositions with a sprayer such as a spray dryer, and a method of dispersing and curing these curable silicone compositions in water or an aqueous solution of a surfactant. Further, as the latter method, the cured silicone powder prepared by the above method using the curable silicone composition containing no non-crosslinked oil is impregnated with the non-crosslinked oil itself, A method of impregnating oil with an organic solvent or the like can be mentioned.

[0011] Among the methods for preparing these cured silicone powders, the method comprises a non-crosslinked oil and a surfactant,
Since a spherical cured silicone powder having excellent dispersibility in an organic resin can be obtained, a method in which these curable silicone compositions are dispersed in an aqueous surfactant solution and cured is most preferable. In order to disperse the curable silicone composition in an aqueous surfactant solution, for example,
It is preferable to use a stirring device such as a homogenizer or a colloid mill, or a mixing device such as an ultrasonic vibrator. At this time, it is preferable to cool these curable silicone compositions in advance. In order to stably disperse these curable silicone compositions as particles in water, it is necessary to use 0.1 to 20 parts by weight of a surfactant based on 100 parts by weight of the curable silicone composition. Preferably, it is particularly preferable to use 0.5 to 10 parts by weight. Water is added in an amount of 40 to 2 parts by weight per 100 parts by weight of the curable silicone composition.
000 parts by weight, particularly 40 to 10 parts by weight.
It is preferable to use 00 parts by weight. This is because if the amount of water is less than this range, it tends to be difficult to disperse the curable silicone composition in water, while if it is more than this range, the productivity of the cured silicone powder is significantly deteriorated. This is because there is a tendency to do so. The water is preferably ion-exchanged water having a small amount of metal ions and halogen ions and an electric conductivity of 1 μS / cm or less, since the water can stably disperse the curable silicone composition in the water. Is preferably ion-exchanged water of 0.5 μS / cm or less.

Next, the aqueous dispersion of the curable silicone composition prepared by the above method is heated or allowed to stand at room temperature, whereby the composition is cured to obtain a cured silicone powder aqueous dispersion. it can. When the aqueous dispersion of the curable silicone composition is heated, the heating temperature is preferably 100 ° C. or lower, particularly preferably 10 to 95 ° C. Examples of the method of heating the aqueous dispersion include a method of directly heating the aqueous dispersion and a method of adding the aqueous dispersion to hot water. Next, the cured silicone powder can be obtained by removing water from the aqueous dispersion of the cured silicone powder. As a method for removing water from the aqueous dispersion of the cured silicone powder, for example, a vacuum dryer,
A hot air circulation type oven and a spray dryer are mentioned.

The inorganic fine powder covering the surface of the cured silicone powder includes, for example, metal oxide fine powders such as silicon oxide, titanium oxide, aluminum oxide, zirconium oxide and antimony oxide; Fine powders of metal nitride such as aluminum; fine powders of sulfides; fine powders of chlorides are preferable, and fine powders of metal oxides are particularly preferable. Further, the surface of these inorganic fine powders may be subjected to a hydrophobic treatment in advance with an organosilicon compound such as organoalkoxysilane, organochlorosilane, organosilazane, or organohydrogenpolysiloxane. The particle size of the inorganic fine powder may be a particle size sufficient to cover the surface of the cured silicone powder, for example, a particle size of 1/10 or less of the average particle size of the cured silicone powder. It is preferred that In addition, as this inorganic fine powder,
It is preferable to use one having a BET specific surface area of 10 m ² / g or more.

As a method of coating the surface with the inorganic fine powder, for example, a method of mixing the cured silicone powder obtained by the above method with the inorganic fine powder under mechanical shearing,
A method of adding an inorganic fine powder to an aqueous dispersion of the cured silicone powder obtained by the above method to remove water is mentioned. Examples of an apparatus for mixing these powders under the mechanical shear include a Henscheln mixer and a super mixer. The mixing of these powders can be performed, for example, at room temperature. In addition, as the mixing time, the cured silicone powder having poor fluidity exhibits fluidity by coating the surface with the inorganic fine powder, so that it can be appropriately determined by observing a change in this state. is necessary.

[0015] The coating amount of the inorganic fine powder is not limited.
For example, the amount is preferably 0.5 to 100 parts by weight, particularly 1 to 100 parts by weight of the cured silicone powder.
It is preferably from 50 to 50 parts by weight. This is because if the coating amount is less than this range, the cosmetics containing the cured silicone powder as components tend to be unable to impart good elongation to the skin and a feeling of use. In such a case, the amount of the inorganic fine powder that cannot be coated on the cured silicone powder increases, and there is a tendency that a cosmetic containing the cured silicone powder as a component cannot be imparted with good elongation to hand skin and a feeling of use.

In the cosmetic of the present invention, the compounding amount of the composite cured silicone powder is 0.1 to 0.1% of the cosmetic.
It is preferably 80% by weight, particularly preferably 1 to 50% by weight. This is because if the content is out of this range, it tends to be difficult to impart good elongation to the hand skin and a feeling of use to the cosmetic.

The cosmetic of the present invention may contain waxes, oils, volatile oils, and powders depending on the dosage form. Examples of the wax include beeswax, carnauba wax, candelilla wax, ozokerite, ceresin, rice wax, mocro, montan wax, candelilla wax, ozokerite, paraffin wax, microcrystalline wax, atearyl alcohol, hydrogenated castor oil, Lanolin, Vaseline, cholesteryl stearate are exemplified, and alkoxy-modified polysiloxane, polyoxyalkylene-modified silicone,
Semi-solid or solid silicone oils such as alkyl-modified silicones are included. These waxes may be used alone, or two or more of these waxes may be used in combination. Although the content of these waxes is optional,
It is preferably 0.5 to 90% by weight of the cosmetic, particularly preferably 1 to 80% by weight.

Examples of the oil include liquid paraffin, hexyl laurate, isopropyl myristate,
Myristyl myristate, cetyl myristate, 2-octyldodecyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, butyl stearate, decyl oleate, 2-octyl dodecyl oleate, myristyl lactate, cetyl lactate, lanolin acetate, stearyl Alcohol, cetostearyl alcohol, oleyl alcohol, avocado oil, almond oil, olive oil, cocoa oil, jojoba oil, sesame oil, safflower oil, soybean oil, camellia oil, squalane, persic oil, castor oil,
Mineral oil, cottonseed oil, coconut oil, egg yolk oil, tallow, lard, glycol ester oils such as polypropylene glycol monooleate, neopentyl glycol-2-ethylhexanoate; polyhydric alcohols such as isostearic acid triglyceride and coconut oil fatty acid triglyceride Ester oil;
Polyoxyalkylene ether oils such as polyoxyethylene lauryl ether and polyoxypropylene cetyl ether; alcohols such as ethanol, octyl dodecanol, cetyl alcohol and oleyl alcohol; dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, dimethyl Siloxane / methyl stearoxysiloxane copolymer, dimethylsiloxane / methylcetyloxysiloxane copolymer, dimethylsiloxane / methyl (polyoxyethylene) siloxane copolymer, dimethylsiloxane / methyl (polyoxyethylene / polyoxypropylene) siloxane Polymer, dimethylsiloxane / methyl (polyoxypropylene) siloxane copolymer, cyclic dimethylsiloxane,
Examples include silicone oils such as cyclic methylphenylsiloxane, cyclic methylhydrogensiloxane, amino-modified polysiloxane, epoxy-modified polysiloxane, polyoxyalkylene-modified polysiloxane, alkoxy-modified polysiloxane, and alkyl-modified polysiloxane. These oils may be used alone, or two or more of these oils may be used as a mixture. The content of these oils is optional, but is preferably 0.5 to 90% by weight of the cosmetic.

Examples of the volatile oil include cyclic diorganosiloxanes such as octamethyltetracyclosiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; hexamethyldisiloxane, octamethyltrisiloxane, and decamethyltetrasiloxane. And diorganosiloxane oligomers; lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, and isopropyl alcohol; and paraffinic hydrocarbons. The content of these volatile oil agents is optional, but is preferably 0.5 to 90% by weight, particularly preferably 1 to 80% by weight of the cosmetic.

Examples of this powder include talc, sericite, mica, colloidal silica, kaolin, bentonite, hectorite, colloidal aluminum magnesium silicate, magnesium carbonate, calcium carbonate, zinc oxide, fine zinc oxide, titanium oxide, fine oxide Titanium,
Inorganic fine powder such as iron oxide and fine iron oxide; silk powder
Organic resin powders such as cellulose powder, polyethylene resin powder, Teflon resin powder, acrylic resin powder, polypropylene resin powder, polystyrene resin powder, vinyl chloride resin powder, nylon resin powder, acrylic resin powder, and polyorganosilsesquioxane powder, An organic resin powder coated with an inorganic powder is exemplified. These powders may be blended alone, or two or more of these powders may be blended and blended. The blending amount of these powders is arbitrary, but is preferably 0.05 to 90% by weight of the cosmetic, particularly preferably 10 to 80% by weight.

The cosmetic of the present invention may further comprise, as optional components, purified water, sorbitan aliphatic esters, polyoxyethylene sulitol lanolin derivatives, polyoxyethylene aliphatic ethers, polyoxyethylene, etc., depending on the purpose of use. Surfactants such as ethylene propylene glycol stearate, polyoxyethylene stearate, polyoxyethylene sorbitan aliphatic ether, and polyoxypropylene / polyoxyethylene condensate; glycerin;
Thickeners such as carboxymethylcellulose and alginic acid;
Fluorinated oils such as perfluoropolyether, perfluorodecalin and perfluorooctane; aluminum chlorohydroxide, aluminum hydroxybromide, aluminum chloride, aluminum / zirconium / glycine complex, aluminum chloride and aluminum hydroxychloride or aluminum chlorohydroxide Astringents such as mixtures; quaternary ammonium salts,
Bacteriostatic or bactericidal agents such as alkyldiaminoethylglycine chloride solution, isopropylmethylphenol, triclosan (trichlorohydroxydiphenyl ether), hinokitiol; benzoic acid and its derivatives, anthranilic acid and its derivatives, salicylic acid and its derivatives,
UV absorbers such as cinnamic acid and its derivatives, benzophenone and its derivatives; coloring agents such as inorganic pigments, organic pigments, pearl pigments, and organic dyes; preservatives, wetting agents, antioxidants, pH adjusters, fragrances, and moisturizers Agents, anti-inflammatory agents, blood circulation promoters, antibacterial agents, skin activators, propellants, and stabilizers. The mixing amount of these components is optional, but is preferably 0.01 to 10% by weight of the cosmetic.

The method for producing the cosmetic of the present invention includes:
For example, there is a method in which ingredients of cosmetics such as cured silicone powder are mixed by a batch system or a continuous system. As this mixing device, for example, a homomixer,
Examples include a homodisper, a paddle mixer, a colloid mill, a propeller stirrer, a homogenizer, an in-line continuous emulsifier, an ultrasonic emulsifier, and a vacuum kneader.

[0023]

EXAMPLES The cosmetic of the present invention will be described in more detail with reference to examples. In addition, the viscosity in an Example is a value measured at 25 degreeC. The characteristics of the cured silicone powder used as a component of the cosmetic were measured as follows. [Hardness of cured silicone powder] The curable silicone composition used for preparing the cured silicone powder was cured at room temperature by 2
By leaving it to stand for 4 hours, a sheet-like cured product of silicone was formed. The hardness of the cured product is measured according to JIS K6301.
The hardness (JIS A) of the cured silicone powder was measured by a JIS A-type hardness tester specified in (1). [Average particle size of cured silicone powder] The average particle size (number average) of the cured silicone powder was determined by an image processing device connected to an optical microscope. [Contents of Non-Crosslinked Oil and Surfactant in Cured Silicone Powder] A dispersion is prepared by adding 1000 g of toluene and 1000 g of isopropanol to 100 g of the cured silicone powder, and the dispersion is stirred using a stirrer, for example, a homodisper. 10 minutes at 1000 rpm, 5 more
After stirring at 00 rpm for 10 minutes, this was allowed to stand at room temperature for 12 hours. Thereafter, the dispersion was again stirred at 500 rpm for 10 minutes using a homodisper. This dispersion was filtered through filter paper to collect a filtrate. Then, 750 g of toluene and 750 g of isopropanol were added to the cured silicone powder remaining on the filter paper to prepare a dispersion, and the dispersion was dispersed at 1000 rpm using a homodisper at 1000 rpm.
Stirred for 0 minutes. This dispersion was filtered through filter paper to collect a filtrate. This filtrate was combined with the filtrate collected earlier,
Toluene and isopropanol were distilled off at 80 ° C. and 70 mmHg using an evaporator. The viscosity and weight of the obtained oil were measured. The oil was analyzed by proton nuclear magnetic resonance spectroscopy, gel permeation chromatography, and infrared spectroscopy to identify the components of the oil. [Elongation of Cosmetic] Ten panelists used a cosmetic containing the cured silicone powder as a component, and 8 to 10 people answered that the elongation was good. A certain case is indicated by Δ, and a case of 0 to 3 persons is indicated by X. [Cosmetic Use Feeling] In the case where eight panelists asked ten panelists to use the cosmetics containing the cured silicone powder as a component, and said that the skin feel good. ○ When 4 to 7 people, △, 0 to 3 people, ×
As shown. [Dispersibility of Cured Silicone Powder in Cosmetics] Cosmetic containing the cured silicone powder as a component is thinly spread on a glass plate, and an image processing apparatus connected to an optical microscope is used.
The average particle size of the cured silicone powder dispersed in the cosmetic was determined. Then, the dispersibility of the cured silicone powder in the cosmetic was evaluated based on the average particle size.

REFERENCE EXAMPLE 1 96 parts by weight of a dimethylpolysiloxane blocked at both ends of a molecular chain having a viscosity of 100 centipoise and a methylhydrogenpolysiloxane blocked by a trimethylsiloxy group at both ends of a molecule having a viscosity of 20 centipoise 3 Parts by weight, viscosity 3000
3 parts by weight of a dimethylpolysiloxane having centipoise-blocked trimethylsiloxy groups at both ends of the molecular chain and an isopropanol solution of chloroplatinic acid (the platinum metal in this solution is the same as that of dimethylpolysiloxane blocked at both ends of the molecular chain at dimethylvinylsiloxy group) (An amount of 20 ppm by weight) was mixed to prepare a liquid silicone rubber composition.
This composition was previously dispersed in an aqueous solution of polyoxyethylene nonylphenyl ether having an HLB value of 13.1 and then homogenized (300 kgf / cm ² ).
To form an emulsion of this composition. This emulsion was allowed to stand at room temperature for 24 hours to cure the liquid silicone rubber composition in the emulsion to obtain an aqueous dispersion of silicone rubber powder.
Here, this aqueous dispersion was dried in an oven at 100 ° C. to obtain a silicone rubber powder. The hardness of this powder is 40
And the average particle size was 5 μm. The content of the non-crosslinked oil in the powder was 4% by weight, and most of the non-crosslinked oil was a dimethylpolysiloxane having a viscosity of 3000 centipoise and capped at both ends of a molecular chain with trimethylsiloxy groups. The oil contained polyoxyethylene nonylphenyl ether, and the content of the powder was confirmed to be 0.8% by weight.
Next, B was added to the aqueous dispersion of the silicone rubber powder prepared above.
An amorphous silica fine powder having an ET specific surface area of 130 m ² / g was stirred by a homodisper in an amount of 4 parts by weight with respect to 100 parts by weight of the silicone rubber powder, and the aqueous dispersion was heated by a hot air blower. Composite silicone rubber powder obtained by drying by spraying inside and coating the surface of the silicone rubber powder with amorphous silica fine powder
(A) was prepared.

Reference Example 2 96 parts by weight of a dimethylvinylsiloxane-blocked dimethylvinylsiloxy group at both ends of a molecular chain having a viscosity of 500 centipoise, and dimethylsiloxane methylhydrogen blocked at a molecular chain at both ends of a trimethylsiloxy group having a viscosity of 20 centipoise. 3 parts by weight of siloxane copolymer, trimethylsiloxy-terminated dimethylpolysiloxane having both ends of molecular chain having a viscosity of 20 centipoise
Parts by weight and a solution of chloroplatinic acid in isopropanol (the amount of platinum metal in this solution is 20 ppm by weight with respect to the above-mentioned dimethylpolysiloxane-blocked dimethylvinylsiloxy group at both ends of the molecular chain) to form a liquid silicone rubber. A composition was prepared. This composition has an HLB value of 13.
After previously dispersing in an aqueous solution of polyoxyethylene nonylphenyl ether 1 as above, this was emulsified with a homogenizer (300 kgf / cm ² ) to prepare an emulsion of this composition. This emulsion was allowed to stand at room temperature for 24 hours to cure the liquid silicone rubber composition in the emulsion to obtain an aqueous dispersion of silicone rubber powder. The dispersion was dried in an oven at 100 ° C. to obtain a silicone rubber powder. The hardness of this powder was 26 and the average particle size was 5 μm. The content of non-crosslinked oil in this powder was 11% by weight.
Most of them are dimethylpolysiloxanes having a viscosity of 20 centipoise and capped at both ends of a molecular chain with trimethylsiloxy groups, and the non-crosslinked oil contains polyoxyethylene nonylphenyl ether. It was confirmed that the content in the powder was 0.8% by weight. Next, 100 parts by weight of the silicone rubber powder was added to a fine powder of hydrophobic zinc oxide 8 having a particle size of 0.27 μm.
A composite silicone rubber powder obtained by mixing parts by weight with a Henschel mixer at 2000 rpm for 10 minutes and coating the surface of the silicone rubber powder with hydrophobic zinc oxide fine powder.
(B) was prepared.

REFERENCE EXAMPLE 3 96 parts by weight of a dimethylpolysiloxane blocked at both ends of a molecular chain having a viscosity of 200 centipoise and a trimethylsiloxy group blocked at both ends of a molecule having a viscosity of 20 centipoise. 3 parts by weight of a siloxane copolymer, and a dimethylpolysiloxane having a viscosity of 100 centipoise and capped with trimethylsiloxy groups at both molecular terminals.
0 parts by weight and an isopropanol solution of chloroplatinic acid (an amount in which platinum metal in the solution is 20 ppm by weight with respect to the above-mentioned dimethylpolysiloxane blocked with dimethylvinylsiloxy groups at both ends of the molecular chain) is uniformly mixed. A liquid silicone rubber composition was prepared. HLB
After previously dispersing in an aqueous solution of polyoxyethylene nonyl phenyl ether having a value of 13.1, this was emulsified with a homogenizer (300 kgf / cm ² ) to prepare an emulsion of this composition. This emulsion was allowed to stand at room temperature for 24 hours to cure the liquid silicone rubber composition in the emulsion to obtain an aqueous dispersion of silicone rubber powder. This aqueous dispersion is
Drying in an oven at ° C. gave a silicone rubber powder.
The hardness of this powder was 31 and the average particle size was 5 μm. The content of non-crosslinked oil in this powder is 1
2% by weight, most of which is dimethylpolysiloxane having a viscosity of 100 centipoise and capped at both ends of a molecular chain with trimethylsiloxy groups, and polyoxyethylene nonylphenyl ether is contained in this non-crosslinked oil. It was confirmed that the content in the powder was 1.2% by weight. Next, this silicone rubber powder 1
00 parts by weight and a particle size of 0.03 to 0.05 μm,
12 parts by weight of a hydrophobic titanium oxide fine powder having a BET specific surface area of 30 to 40 m ² / g were mixed at 2000 rpm for 10 minutes using a Henschel mixer, and the surface of the silicone rubber powder was coated with the hydrophobic titanium oxide fine powder. A composite silicone rubber powder (C) was prepared.

[Reference Example 4] Toluene (10 times the weight of the powder) and isopropanol (10 times the weight of the powder) were added to the silicone rubber powder prepared in the reference example 1 to prepare a dispersion. This dispersion was stirred at 1000 rpm for 10 minutes using a homodisper, and further stirred at 500 rpm for 10 minutes.
Let stand for hours. Thereafter, the dispersion was again stirred at 500 rpm for 10 minutes using a homodisper. This dispersion was filtered with filter paper. Then, toluene (1 weight based on the weight of this powder) is added to the silicone rubber powder remaining on the filter paper.
(0-fold amount) and isopropanol (10-fold amount based on the weight of the powder) were added to prepare a dispersion, and the dispersion was stirred at 1000 rpm for 10 minutes using a homodisper. This dispersion was filtered through filter paper to prepare a silicone rubber powder (D) having an average particle size of 5 μm. This silicone rubber powder does not contain non-crosslinked oil,
Further, it did not contain polyoxyethylene nonylphenyl ether.

Reference Example 5 Methyltrimethoxysilane was added dropwise to an aqueous solution of potassium hydroxide to gradually hydrolyze, dehydrated by a centrifuge, washed with water and methanol, and then placed in an oven at 100 ° C. After drying, a silicone resin powder (E) was prepared. This powder had a hardness of 90 or more and an average particle size of 5 μm. In addition, this powder did not contain any non-crosslinked oil and surfactant.

Reference Example 6 A BET specific surface area of 130 parts by weight was added to 100 parts by weight of the silicone rubber powder (D) prepared in Reference Example 4.
A composite silicone rubber powder obtained by mixing 4 parts by weight of amorphous silica fine powder of m ² / g at 2000 rpm for 10 minutes using a Henschel mixer and coating the surface of the silicone rubber powder with the amorphous silica fine powder. (F) was prepared.

Reference Example 7 96 parts by weight of a dimethylvinylsiloxane-blocked dimethylvinylsiloxy group at both ends of a molecular chain having a viscosity of 500 centipoise, and a dimethylsiloxane-methylhydrogen blocked by a trimethylsiloxy group at both ends of a molecular chain having a viscosity of 20 centipoise. 3 parts by weight of siloxane copolymer, trimethylsiloxy-terminated dimethylpolysiloxane 20 at both molecular chains having a viscosity of 20 centipoise
Parts by weight and chloroplatinic acid in isopropanol solution (the amount of platinum metal in this solution is 20 ppm by weight with respect to the above-mentioned dimethylvinylsiloxy-group-blocked dimethylpolysiloxane capped at both molecular chains) to form a liquid. A silicone rubber composition was prepared. This composition was sprayed into hot air at 300 ° C. using a spray dryer to obtain a silicone rubber powder (G). The hardness of this powder was 24 and the average particle size was 50 μm. The content of non-crosslinked oil in this powder was 21% by weight, and most of the powder was dimethylpolysiloxane having a viscosity of 20 centipoise and capped at both ends of a molecular chain with trimethylsiloxy groups.
Also, this powder did not contain any surfactant.

Examples 1 and 2 and Comparative Examples 1 to 4 Silicone rubber powders A, B, D, E and G and hydrophobic zinc oxide fine powder (H) having an average particle diameter of 0.27 μm were used as powders. 24 parts by weight, 5 parts by weight of octyl p-methoxycinnamate, 1 part by weight of α-monoisostearyl glyceryl ether polyoxyethylene sorbitan monooleate, 2 parts by weight of beeswax, 2 parts by weight of lanolin, 10 parts by weight of squalane , 10 parts by weight of liquid paraffin, 45 parts by weight of purified water, an appropriate amount of preservative, and an appropriate amount of perfume were stirred with a homodisper at 2500 rpm for 5 minutes to prepare a liquid cosmetic. Table 1 shows the evaluation results of the liquid cosmetic.

[0032]

[Table 1]

Example 3, Comparative Examples 5 and 6
Hydrophobic zinc oxide fine powder surface-treated with silicone rubber powder C, F and methyl hydrogen polysiloxane
15 parts by weight of (I), 10 parts by weight of hydrophobic titanium oxide surface-treated with cimethylhydrogenpolysiloxane,
20 parts by weight of talc, 30 parts by weight of mica, 1 part by weight of bengalara, 2.5 parts by weight of yellow iron oxide, 0.1 part by weight of black iron oxide, 10 parts by weight of liquid paraffin, a trace amount of preservative, and a trace amount of fragrance are mixed with a Henschel mixer. The mixture was mixed at 1500 rpm for 10 minutes to prepare a powder foundation cosmetic. Table 2 shows the evaluation results of these powder foundation cosmetics.

[0034]

[Table 2]

[0035]

Industrial Applicability The cosmetic of the present invention is a cosmetic comprising a cured silicone powder as a component, wherein the composite is obtained by coating the surface of a cured silicone powder containing a non-crosslinked oil with an inorganic fine powder. Since the cured silicone powder is used, there is a feature that the stretch to the hand skin and the feeling of use are excellent.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuo Kobayashi 2-2 Chikusa Beach, Ichihara City, Chiba Prefecture Toray Dow Corning Silicone Co., Ltd.

Claims (6)

[Claims] 1. A cosmetic comprising a composite cured silicone powder obtained by coating the surface of a cured silicone powder containing a non-crosslinked oil with a fine inorganic powder. 2. The cosmetic according to claim 1, wherein the non-crosslinked oil is a silicone oil. 3. The cosmetic according to claim 1, wherein the inorganic fine powder is a metal oxide fine powder. 4. The cosmetic according to claim 1, wherein the cured silicone powder is a silicone rubber powder. 5. The cosmetic according to claim 1, wherein the content of the non-crosslinked oil in the cured silicone powder is 0.5 to 80% by weight. 6. The cosmetic according to claim 1, wherein the cured silicone powder also contains a surfactant.