JP2008044883A - Skin cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a skin cosmetic that continuously controls greasiness by sebum in spite of having a refreshing feeling, is stable even at a high temperature and has good sense of use and an excellent moisture retaining effect. <P>SOLUTION: The skin cosmetic comprises porous powder having absorbed an aqueous solution containing a water-soluble polymer and/or polyhydric alcohol. The surface of the porous powder is coated with an oil agent component containing a crosslinking type organopolysiloxane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a skin cosmetic that has a refreshing feeling and continuously suppresses stickiness due to sebum and has an excellent moisturizing effect.

  There are many people in their late teens to early 20s who are concerned about oily skin problems due to excessive sebum and skin irregularities such as pores. People with oily skin have disgust and discomfort with greasy skin quality, as well as discomfort due to makeup loss and shine due to sebum. Those who are worried about skin irregularities were dissatisfied with the unnatural finish due to the use of highly concealing cosmetics. As countermeasures against the former, a method of pressing oil removing paper against the skin to remove excess sebum, or a method of spraying mist-like lotion and removing with tissue or the like has been proposed. In the latter, a method of mixing and blending powders having different refractive indexes is employed.

  However, in any method, the cosmetic dosage form used is an oil-in-water type (O / W type) or a water-in-oil type (W / O type) emulsified liquid cosmetic (Patent Document 1, Patent Document) 2, Patent Document 3), Presto type powder (Patent Document 4), or melt-filled oily solid cosmetic (Patent Document 5), both of which have the effect of suppressing excess sebum and the effect of hiding skin irregularities. It was not sufficient in terms of sustainability and could not improve skin quality.

Further, in the method of simply absorbing water in the porous silica and covering with oil as in Patent Document 6, the moisture evaporates when stored at a high temperature, the viscosity increases, the composition becomes hard, and cannot be used. was there.
JP 2003-192521 A JP-A-5-178733 JP-A-3-79669 Japanese Patent Laid-Open No. 3-197413 JP 2000-281532 A JP 2002-205910 A

  An object of the present invention is to provide a skin cosmetic that has a refreshing feeling and continuously suppresses stickiness due to sebum, is stable even at high temperatures, has a good feeling of use, and has an excellent moisturizing effect. .

  The present inventor has found that the above problem can be solved by causing a porous powder to absorb an aqueous solution containing a water-soluble polymer and / or a polyhydric alcohol and coating the surface with a specific oil component.

  The present invention contains a porous powder that has absorbed an aqueous solution containing a water-soluble polymer and / or a polyhydric alcohol, and the surface of the porous powder is coated with an oil component containing a cross-linked organopolysiloxane. It is intended to provide skin cosmetics.

  The skin cosmetic of the present invention has a refreshing feeling and continuously suppresses stickiness due to sebum, can relieve the discomfort of oily skin, is stable even at high temperatures, has a good feeling of use, Excellent moisturizing effect. In particular, it is suitable as a moisturizing cosmetic.

  Specific examples of the porous powder used in the present invention include organic porous powders such as polyamide, polyacrylate, polymethacrylate, styrene-divinylbenzene copolymer and cellulose; calcium silicate, aluminum silicate, barium silicate, etc. Metal salts of silicates; metal carbonates such as calcium carbonate and cobalt carbonate; metal tungstates such as calcium tungstate; metal oxides such as cobalt oxide and α-iron oxide; metal oxides such as hydrated iron oxide In addition, silica (including silica gel), hydroxyapatite, lanolin powder and the like can be mentioned.

  These porous powders preferably have an average particle diameter of 1 to 20 μm, and further a combination of a porous powder having an average particle diameter of less than 1 to 6 μm and a porous powder having an average particle diameter of 6 to 20 μm Are preferably used. If the porous powder is too small, the spread of the skin cosmetics will be poor, and if it is too large, it will feel a stain. The porous powder preferably has an average pore diameter of 50 mm or more in one powder particle.

Of these, porous silica having a water absorption of 50 to 250 mL / 100 g is preferable. The porous silica may be spherical or plate-shaped. In particular, it is preferable to use both in combination.
Here, the water absorption is a value measured according to the two-blade mixing method of the mechanical method (JIS K6221-1982), and is measured using an oil absorption measuring device S-410 (manufactured by Frontex). In the measurement method, the torque is calculated from the torsion angle of the torsion bar corresponding to the mixing torque when water is dropped onto the powder at 4 mL / min, and the dripping amount of 70% torque of the maximum torque is taken as the water absorption amount.

  It is preferable that the porous powder is contained in the entire skin cosmetic composition (by weight before water absorption) in an amount of 5 to 40% by mass, particularly 10 to 30% by mass, because it has no roughness and feels good.

  In this invention, powder other than porous powder can be contained. The powder other than the porous powder may be spherical, plate-shaped, or amorphous. These preferably have an average particle size of 0.001 to 30 μm.

The spherical powder has a spherical shape and a shape similar to a sphere. Spherical powder includes inorganic powders such as calcium silicate, magnesium silicate, and anhydrous silicic acid; organic powders such as crystalline cellulose, poly (meth) acrylic acid ester (methyl, ethyl ester), nylon powder, and polyvinylpyrrolidone; siloxane bond And polymethylsilsesquioxane powder having an intermediate structure between inorganic and organic in which a three-dimensional network structure is formed and a methyl group is bonded to one silicon atom. The spherical powder preferably has an average particle size of 0.1 to 30 μm, particularly 1 to 20 μm. One or more spherical powders can be used, and a smooth feel can be obtained.
The content of the spherical powder is preferably 1 to 30% by mass, particularly 3 to 30% by mass in the total composition of the skin cosmetic.

  Examples of the plate powder include talc, mica, kaolin, sericite, and pearl pigment. The plate-like powder preferably has an average particle size of 0.1 to 30 μm, particularly 1 to 20 μm. One or more types of plate-like powders can be used, which are preferable from the viewpoint of ease of taking a cosmetic and easiness of stretching.

Further, as the amorphous fine particles, amorphous fine particle silicic acid is preferable, and those having an average particle diameter of 0.001 to 0.01 μm separate the oil agent component from a good feeling of use without causing squeaking. It is preferable because good stability is obtained. The particle diameter of the amorphous fine particle silicic acid is measured by a transmission electron microscope.
Examples of the amorphous fine particle anhydrous silicic acid include hydrophilic amorphous fine particle anhydrous silicic acid having a particle diameter in the above range, obtained by hydrolyzing ordinary silicon tetrachloride in a hydrogen / oxygen flame, the hydrophilic Amorphous fine particle silicic acid obtained by hydrophobizing the surface of the hydrophilic amorphous fine particle silicic acid. The amorphous fine particle silicic acid anhydride may be hydrophilic or hydrophobic, but is preferably hydrophilic.

As the amorphous fine particle silicic acid, for example, commercially available products such as Aerosil 200, Aerosil 300, Aerosil R972, Aerosil R974, Aerosil R202, Aerosil RY200 (above, manufactured by Nippon Aerosil Co., Ltd.), Talanox 500 (manufactured by Tarco) are used. be able to.
When the amorphous fine particle silicic acid is contained in the total composition of the skin cosmetic in an amount of 0.1 to 5% by mass, particularly 0.1 to 1% by mass, a good feeling of use without causing squeaking and an oil agent Good stability without separation of the components can be obtained, and a good cosmetic lasting effect can be obtained, which is preferable.

  In the present invention, these powder surfaces may be either hydrophilic or hydrophobic. Hydrophobic treatment includes trimethylsiloxylation treatment with trimethylsilyl chloride, hexamethyldisilazane, etc .; methylation treatment with dimethyldichlorosilane; coating baking treatment with methylhydrogenpolysiloxane; dimethylpolysiloxane, metal soap, etc. A coating etc. are mentioned.

One or more kinds of powders other than the porous powder can be used, and it is preferably contained in the total composition in an amount of 1 to 30% by mass, particularly 4 to 20% by mass from the viewpoint of feeling of use and uneven blurring effect.
In addition, the content ratio of the powder other than the porous powder and the porous powder (mass ratio, the mass of both powders is the mass before water absorption) is from the viewpoint of both sebum removability and usability. The ratio is preferably 3: 4 to 1: 5.

  In the present invention, water absorption of the whole powder including the porous powder (the whole powder is before water absorption) is 50 to 250 mL / 100 g, particularly 70 to 250 mL / 100 g without causing water separation. Since it can manufacture stably, it is preferable. The amount of water absorption is measured in the same manner as described above.

In the present invention, the aqueous solution absorbed by the porous powder contains a water-soluble polymer and / or a polyhydric alcohol.
The water-soluble polymer may be a natural polymer, a semisynthetic polymer, or a synthetic polymer. Examples of natural polymers include alginic acid, carrageenan, agar, fercelan, guar gum, quince seed gum, starch, gum arabic, pectin, chitosan, hyaluronic acid, chondroitinic acid, albumin, gelatin, soluble collagen, xanthan gum, dextran, pullulan and the like. Examples of the semi-synthetic polymer include methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and cationized cellulose; Examples of the synthetic polymer include polyvinyl alcohol, carboxyvinyl polymer, polyacrylic acid, sodium polyacrylate, polyvinyl pyrrolidone, and the like. Is mentioned.

  Examples of the polyhydric alcohol include propylene glycol, 1,3-butylene glycol, polyethylene glycol (molecular weight 1500 or less), glycerin, sorbitol, xylitol, maltitol and the like.

In the present invention, one or more selected from these water-soluble polymers and polyhydric alcohols are used, and a water-soluble polymer and a polyhydric alcohol can also be used in combination. The water-soluble polymer is dissolved in water and then absorbed into the powder.
The content of the water-soluble polymer and / or polyhydric alcohol is preferably 0.01 to 10% by mass, and particularly preferably 0.1 to 5% by mass in the total composition of the skin cosmetic.

  In the present invention, the porous powder is allowed to absorb an aqueous solution containing a water-soluble polymer and / or a polyhydric alcohol. The water absorption method is not particularly limited, and for example, water can be absorbed by mixing a porous powder and an aqueous solution. Alternatively, after mixing the porous powder and the oil component, the aqueous solution can be mixed to absorb water.

In the present invention, the porous powder has a surface coated with an oil component containing a cross-linked organopolysiloxane.
Examples of the crosslinked organopolysiloxane include a crosslinked alkylaryl polysiloxane and a crosslinked alkylpolysiloxane. Examples of the crosslinkable alkylaryl polysiloxane include a crosslinkable organopolysiloxane having an alkyl group having 1 to 5 carbon atoms and an aryl group having 6 to 10 carbon atoms, such as a crosslinkable methylphenyl polysiloxane. . Examples of the crosslinked alkylpolysiloxane include a crosslinked dialkylpolysiloxane having an alkyl group having 1 to 5 carbon atoms, such as a crosslinked dimethylpolysiloxane.

  In addition, as the cross-linked organopolysiloxane, for example, a paste-like KSG15 that is a mixture of decamethylcyclopentasiloxane and a cross-linkable organopolysiloxane, or a paste that is a mixture of a low-viscosity dimethylpolysiloxane and a cross-linkable organopolysiloxane Commercially available products such as KSG16, paste-like KSG18 (manufactured by Shin-Etsu Chemical Co., Ltd.), which is a mixture of methylphenylpolysiloxane and cross-linked organopolysiloxane, can also be used.

  The cross-linked organopolysiloxane is preferably contained in the entire skin cosmetic composition in an amount of 0.6 to 9% by mass, particularly 0.9 to 6.3% by mass from the viewpoint of non-stickiness.

  Examples of the oil component other than the cross-linked organopolysiloxane include silicone oil, hydrocarbon oil, ester oil, ether oil, and fluorine oil. The oil agent component used here is liquid at 25 ° C.

  Examples of the silicone oil include linear polyorganosiloxane represented by the general formula (1), low molecular weight cyclic polysiloxane represented by the general formula (2), and the like.

(In the formula, R ¹ represents an alkyl group having 1 to 5 carbon atoms or an aryl group having 6 to 10 carbon atoms, and all R ¹ may be the same or different. M is 0 to 100,000. Number)

(In the formula, R ¹ represents the same meaning as described above, and n represents a number of 4 to 6)

As the linear organopolysiloxane, a linear alkylpolysiloxane having an alkyl group having 1 to 5 carbon atoms, a linear chain having an alkyl group having 1 to 5 carbon atoms and an aryl group having 6 to 10 carbon atoms Linear alkylaryl polysiloxane and the like, and specifically, linear dimethylpolysiloxane, linear methylphenyl polysiloxane and the like. Among these linear organopolysiloxanes, those having m of 0 to 100 (viscosity 100 mm ² / s or less), particularly those having m of 2 to 50 are preferred from the viewpoint of touch.

  Examples of the cyclic polysiloxane include 4- to 6-membered cyclic siloxane having an alkyl group having 1 to 5 carbon atoms as a substituent, and specific examples include octamethylcyclotetrasiloxane and decamethylcyclopentasiloxane. Can be mentioned.

  Examples of the hydrocarbon oil include liquid paraffin, squalane, light liquid isoparaffin, heavy liquid isoparaffin, polybutene and the like.

  Examples of ester oils include vegetable oils such as safflower oil, soybean oil, grape seed oil, sesame oil, wheat germ oil, avocado oil, olive oil, castor oil, macadamia nut oil, and Medfoam oil; mink oil, Animal oils such as turtle oil and liquid lanolin; fatty acid esters of lower alcohols such as isopropyl myristate, isopropyl isostearate, and lanolin fatty acid isopropyl; 2-ethylhexyl isononanoate, isotridecyl isononanoate, octyldodecyl myristate, octyldodecyl oleate, Fatty acid esters of higher alcohols such as cetyl 2-ethylhexanoate, isocetyl 2-ethylhexanoate and isostearyl isostearate; oxyacid esters of higher alcohols such as diisostearyl malate and cetyl lactate; tricaprylic acid Glyceryl, glyceryl tri-2-ethylhexanoate, glyceryl triisostearate, tri (capryl / capric acid) glycerin, propylene glycol dicaprylate, propylene glycol di (capryl / capric acid), propylene glycol diisostearate, neopentyl glycol dicaprate And fatty acid esters of polyhydric alcohols such as neopentyl glycol 2-ethylhexanoate.

  Examples of the ether oil include dodecyl dimethyl butyl ether and cetyl dimethyl butyl ether, and examples of the fluorine oil include perfluoropolyether and perfluorocarbon.

  The oil component preferably further contains an alkyl-modified silicone. The alkyl-modified silicone used in the present invention is not particularly limited as long as it is usually used in cosmetics. Examples thereof include dimethylpolysiloxane in which at least one silicon atom is substituted with an alkyl group having 6 to 24 carbon atoms, and examples include those represented by the following general formula.

(Wherein R represents an alkyl group having 6 to 24 carbon atoms, and a and b each represent a number of 50 to 1000)

The number average molecular weight of the alkyl-modified silicone is preferably 10,000 to 1,000,000, particularly 10,000 to 500,000. R in the formula is preferably an alkyl group having 16 to 22 carbon atoms.
In the present invention, by using an alkyl-modified silicone, oil seepage from the container can be suppressed and storage stability can be further improved.

  One or more types of alkyl-modified silicone can be used, and the content of 0.5 to 2% by mass, particularly about 1% by mass, in the total composition of the skin cosmetics has no stickiness and good usability and is stable. It is preferable because of its superiority.

  These oil agent components can use 1 or more types, and it is preferable to contain 20-60 mass% in the whole composition, especially 20-55 mass%.

  In the present invention, more excellent effects can be obtained by using a cross-linked organopolysiloxane and volatile silicone and / or non-volatile liquid oil as the oil component.

By using the cross-linked organopolysiloxane in combination with an oil component, it is possible to suppress the outflow of water from the powder during storage, and to impart favorable cosmetic properties without drying the skin during application. In addition, in a system containing a large amount of powder, it is easy to solidify and difficult to spread, but by combining a cross-linked organopolysiloxane with powder, it is soft, easy to stretch, and is not sticky to the touch. Produces a sensation of touch. Furthermore, by combining with porous silica having an average particle diameter of 1 to 6 μm or amorphous fine-particle silicic acid anhydride, it becomes a more elastic liquid and the elongation at the time of application and the feeling of use are improved.
Also, the content ratio (mass ratio) of the total powder containing the porous powder (the total powder is the mass before water absorption) and the total oil agent component including the cross-linked organopolysiloxane is used from the viewpoint of the feeling of use. 1: 1 to 1: 5 are preferred.

  Skin cosmetics of the present invention, in addition to the above components, depending on the purpose of use, semi-solid hydrocarbons, esters, animal and vegetable oils and fats, higher fatty acids, higher alcohols, various polymer resins, ultraviolet absorbers, It can contain pigments, pearl agents, extender pigments, thickeners, surfactants, antioxidants, preservatives, intercellular lipids, vitamins, anti-inflammatory agents, fragrances, other drugs, and the like.

  The skin cosmetic of the present invention preferably contains 5 to 30% by mass, particularly 8 to 20% by mass of water in the total composition from the viewpoint of the touch when applied to the skin and the water absorption of the porous powder. . A refreshing feeling and a refreshing feeling can be obtained by adding water.

  The skin cosmetic of the present invention is, for example, mixed with all powders, impregnated with a fixed amount or all amount of water in which a water-soluble polymer and / or a polyhydric alcohol is dissolved, and then added and kneaded the oil component. If necessary, it can be produced by further adding water and kneading. In addition, it is preferable that water is not contained in an oil agent component.

  The skin cosmetic of the present invention is one in which powder particles are caulked with an oil component, have an appropriate viscosity, and can maintain a certain shape.

  The skin cosmetic of the present invention preferably has a viscosity of 100 to 4000 Pa · s, particularly 300 to 3000 Pa · s, and more preferably 500 to 2000 Pa · s when measured at 5 rpm with a B8R viscometer at 25 ° C. .

Examples 1-7, Comparative Examples 1-2
Skin cosmetics having the composition shown in Table 1 were produced by the following method, and the viscosity at 25 ° C. was measured. The results are also shown in Table 1. In addition, when using each cosmetic, it was evaluated for spread, stickiness, no stickiness, no creaking, smooth feeling, moist feeling, moisturizing feeling, makeup sustainability, pore blurring effect and storage stability. The results are shown in Table 3. In Comparative Example 2, the oil exuded and separated immediately after production.

(Production method)
While stirring the powder, the aqueous phase component is added. After confirming that the powder absorbed all the water phase components and not conducting electricity with a tester, the oil component was added to the mixed powder and kneaded to obtain a skin cosmetic. In addition, it confirmed that the obtained skin cosmetics also did not energize with a tester.

(Evaluation methods)
(1) Nodding, stickiness, non-stickiness, no creaking, smoothness, moistness, moisturizing feeling, makeup persistence and pore blurring effect:
By 10 professional panelists, when using each cosmetic, it spreads, sticks (evenly stretches and does not become uneven), is not sticky, is not squeaky, smooth, moist, moisturizing, makeup persistence, pores Regarding the blurring effect, sensory evaluation was performed in 5 stages from 1 to 5 points, the average score was obtained, and judged according to the following criteria.
A: The average score is 4.5 to 5.0.
A: The average score is 3.5 to 4.4.
(Triangle | delta): An average score is 2.5-3.4.
X: Average point is 1.5 to 2.4.
XX: Average point is 1.0 to 1.4.

(2) Storage stability:
Each skin cosmetic is filled in a tube, and after leaving it to stand for one month under three conditions of 50 ° C., room temperature (25 ° C.), and −5 ° C., it is discharged, and its appearance is observed with the naked eye. It was evaluated with.
○: No oil ooze out.
Δ: Slight oil seepage is observed.
X: Exudation of oil is recognized.

Example 8
Plate-like porous silica (water absorption: 74 mL / 100 g, average particle size 10 μm) 9.0 parts by mass, spherical porous silica (water absorption: 168 mL / 100 g, average particle size 12 μm) 13.5 parts by mass, silicone-treated fine particles Zinc oxide ^{* 1} 5.0 parts by mass, methyl methacrylate crosspolymer (average particle diameter: 17 μm) 5.0 parts by mass, spherical fine particle porous silica (water absorption: 210 mL / 100 g, average particle diameter 3 μm) 3.5 parts by mass Parts, ethyl paraethoxybenzoate 0.2 parts by mass, crosslinked organopolysiloxane A ^{* 4} 23.0 parts by mass, dimethylpolysiloxane ^{* 9} 12.5 parts by mass, isotridecyl isononanoate ^{* 10} 12.5 parts by mass, alkyl-modified silicone ^{* 12} 2.0 parts by weight, 86% glycerin 0.01 part by weight of sodium hyaluronate ^{* 13} 1.0 part by weight, dolabrata extract 1.0 part by weight, 55% ethanol Le 2.0 parts by mass of purified water 9.79 parts by weight (total 100 parts by mass) were mixed in the same manner as in Example 1-7 to prepare a skin cosmetic. The water absorption of all the powders was 170 mL / 100 g, and the viscosity of the obtained skin cosmetic at 25 ° C. was 880 Pa · s.
The obtained cosmetic was evaluated in the same manner as in Example 1. As a result, it was found to have good spread, stickiness, non-stickiness, creaking, smooth feeling, moist feeling, moisturizing feeling, makeup persistence, pore blurring effect and storage stability. there were.

Claims (5)

  A skin cosmetic comprising a porous powder that has absorbed an aqueous solution containing a water-soluble polymer and / or a polyhydric alcohol, and the surface of the porous powder is coated with an oil component containing a cross-linked organopolysiloxane .   The skin cosmetic according to claim 1, wherein the oil component further contains an alkyl-modified silicone.   Furthermore, the skin cosmetics of Claim 1 or 2 containing an amorphous fine particle silicic acid.   The mass ratio of the total powder containing the porous powder (the total powder is the mass before water absorption) and the oil component containing the crosslinked organopolysiloxane is 1: 1 to 1: 5. The skin cosmetic according to any one of 1 to 3.   The skin cosmetic according to any one of claims 1 to 4, wherein the total powder has a water absorption of 50 to 250 mL / 100 g.