JP2006219426A - Skin cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skin cosmetic sustainedly suppressing sebum-related stickiness while having refreshing cool feeling, and also good in preservation stability with hiding skin unevenness. <P>SOLUTION: The skin cosmetic comprises (A) water-absorbed porous powder and (B) zinc oxide, wherein the surface of at least the powder(A) is coated with a caking agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a skin cosmetic that can continuously suppress stickiness due to sebum and can hide skin irregularities while having a refreshing feeling.

People who are worried about oily skin due to excessive sebum and skin irregularities such as pores are particularly common in the late teens to early 20s, and disgust and discomfort with greasy skin quality, or makeup with sebum There are discomfort due to breakage and shine, and discomfort due to unnatural finish due to high concealment.
As a countermeasure against excess sebum, the mainstream is to remove the sebum by washing the face. A method of spraying mist-like lotion and removing with a tissue or the like is also performed.

Moreover, the method of fixing sebum with zinc oxide and suppressing makeup loss (for example, patent document 1, patent document 2, patent document 3) is also known. However, these methods cannot sufficiently prevent shine and makeup loss.
Japanese Patent Laid-Open No. 8-217637 JP-A-8-245343 JP-A-8-41379

  An object of the present invention is to provide a skin cosmetic that can continuously suppress stickiness due to sebum and can hide skin irregularities while having a refreshing feeling.

  The present inventor has found that a skin cosmetic that solves the above-described problems can be obtained by combining a porous powder that has absorbed water and zinc oxide, and coating these surfaces with a binder.

  The present invention provides a skin cosmetic containing (A) a water-absorbed porous powder and (B) zinc oxide, and at least the surface of the powder (A) is coated with a binder. is there.

  The skin cosmetic of the present invention can suppress stickiness due to sebum continuously while having a refreshing feeling, relieve discomfort of oily skin, and conceal skin irregularities such as pores and wrinkles. is there. It is suitable as a sebum removing cosmetic and a concealed concealing cosmetic.

Specific examples of the porous powder of component (A) used in the present invention include organic porous powders such as polyamide, polyacrylate, polymethacrylate, styrene-divinylbenzene copolymer, and cellulose; calcium silicate, aluminum silicate, Silicate metal salts such as barium silicate; Metal carbonates such as calcium carbonate and cobalt carbonate; Tungstic metal salts such as calcium tungstate; Metal oxides such as cobalt oxide and α-iron oxide; Hydrated iron oxide and the like In addition to metal oxides, silica (including silica gel), hydroxyapatite, lanolin powder, and the like can be given.
These porous powders preferably have an average particle diameter of 3 to 20 μm, more preferably 5 to 15 μm, and particularly preferably 10 to 15 μm. 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.
In addition, the average particle diameter of the powder used for this invention shows volume average particle diameter (D4) (average particle diameter calculated by the volume fraction). The measurement can be easily performed with a laser diffraction particle size distribution meter with good reproducibility.

Of these, porous silica having a water absorption capacity of 50 to 200 mL / 100 g is preferred. The porous silica may be spherical or plate-shaped. In particular, it is preferable to use both in combination.
Here, the water absorption capacity 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 Corporation). In the measurement method, the torque is calculated from the torsion angle of the torsion bar according to the mixing torque when water is dropped onto the powder at 4 mL / min, and the dripping amount of 70% of the maximum torque is defined as the water absorption capacity.

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

The zinc oxide of component (B) used in the present invention is not particularly limited as long as it is usually used in cosmetics, and can be used. The specific surface area of zinc oxide is preferably 10 to 100 m ² / g.
Moreover, what hydrophobized the zinc oxide can also be used. 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.

Zinc oxide is preferably contained in the total composition of skin cosmetics in an amount of 1 to 15% by mass, particularly 2 to 10% by mass because it has excellent makeup sustainability, no squeaky feeling, and good usability.
By using a combination of the water-absorbed porous powder and zinc oxide, sebum absorption and gelation can occur quickly, and the effect of preventing shine and makeup loss can be further improved.

  In the present invention, powders other than those described above can be further contained. The powder other than the above may be spherical, plate-shaped, or indefinite. 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.

  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 particles of silicic acid anhydride are preferable, and those having an average particle diameter of 0.001 to 0.01 μm, particularly 0.001 to 0.02 μm, have a good feeling of use without causing squeaking. Good stability without oil separation is obtained, which is preferable. 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, Examples thereof include amorphous fine particles of silicic acid obtained by hydrophobizing the surface of amorphous fine particles of 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 anhydride, 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), etc. Can do.
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. It is preferable because good stability without separation is obtained and a good cosmetic lasting effect is obtained.

  In the present invention, these powder surfaces may be either hydrophilic or hydrophobic. Examples of the hydrophobic treatment method include the same methods as described above.

One or more kinds of powders other than the porous powder can be used, and 1 to 30% by mass, particularly 4 to 20% by mass in the total composition of the skin cosmetic is used in terms of feeling of use and uneven blurring effect. To preferred.
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. It is preferably 2: 5 to 3: 4.

  In the present invention, the porous powder absorbs water. The water absorption method is not particularly limited, and the porous powder and water containing water or other components can be mixed and absorbed. Alternatively, after mixing the porous powder and the binder, water or water containing other components can be mixed and absorbed.

  In the present invention, the water absorption capacity of the whole powder including the porous powder (the whole powder is before water absorption) is 50 to 150 mL / 100 g, particularly 70 to 130 mL / 100 g. Since it can manufacture stably, it is preferable. The water absorption capacity is measured in the same manner as described above.

  In the present invention, the binder for covering the surface of the porous powder may be any one as long as the powder surface is caulked when the powder surface is coated. It is preferable to include an oil component that is liquid at ° C.

  Examples of the oil component contained in the binder include silicone oil, hydrocarbon oil, ester oil, ether oil, and fluorine oil.

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

(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.

  These oil agent components can use 1 or more types, and it is preferable to contain 35-60 mass% in the skin cosmetics total composition, especially 40-55 mass%.

  Further, the binder preferably contains a crosslinked 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. Specifically, for example, a crosslinkable methylphenylpolysiloxane is used. Etc. Examples of the crosslinkable alkylpolysiloxane include a crosslinkable dialkylpolysiloxane having an alkyl group having 1 to 5 carbon atoms. Specific examples include a crosslinkable dimethylpolysiloxane and a crosslinkable methylphenylpolysiloxane. .

  Further, 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 excellent in the ability to gel oil, and can impart favorable cosmetic properties without drying the skin. The composition obtained with this cross-linked organopolysiloxane is comfortable to use, soft and non-sticky to the touch. One is soft due to the structure of the cross-linked organopolysiloxane, and the other is due to properties comparable to microsponges that contain oil.

The cross-linked organopolysiloxane is preferably contained in an amount of 0.6 to 9% by mass, particularly 0.9 to 6.3% by mass in the entire skin cosmetic composition from the viewpoint of non-stickiness.
Further, the content of the cross-linked organopolysiloxane in the total binder is preferably 1.5 to 15% by mass, particularly 2.5 to 13% by mass without stickiness and good usability. .

  In the present invention, a more excellent effect can be obtained by using a crosslinked organopolysiloxane and an oil agent, particularly volatile silicone and / or nonvolatile liquid oil, as a binder.

  In addition, the total powder containing the porous powder (the total powder is the mass before water absorption) and the content ratio (mass ratio) of the total binder are 1: 1 to 3: 5 is preferred.

  The skin cosmetics of the present invention are semi-solid hydrocarbons, esters, animal and vegetable oils and fats, higher fatty acids, higher alcohols, various polymer resins, polyhydric alcohols, depending on the purpose of use in addition to the above components. Contains moisturizers, UV absorbers, dyes, pearls, extenders, thickeners, surfactants, antioxidants, antiseptics, intercellular lipids, vitamins, anti-inflammatory agents, fragrances, other drugs, etc. be able to.

  The skin cosmetic of the present invention contains water in an amount of 10 to 20% by mass, particularly 12 to 18% by mass in the total composition of the skin cosmetics, in terms of feel when applied to the skin and water absorption ability of the porous powder. Is preferred. 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 certain amount or all of water, kneaded with a binder, and further kneaded with water as necessary. By doing so, it can be manufactured. In addition, it is preferable that a binder does not contain water.

  The skin cosmetic of the present invention is one in which powder particles are caulked with a caking agent, 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. .

  The skin cosmetic of the present invention is suitable for sebum removal and unevenness concealment because it is excellent in sebum removal effect and unevenness concealment effect.

Example 1
The skin cosmetics having the composition shown in Table 1 were produced by the following production methods, and the spread, stickiness, non-stickiness, creaking, smooth feeling, makeup persistence, and pore blurring effect were evaluated when each cosmetic was used. . The results are also shown in Table 1.

(Cosmetics production method)
While stirring the powder, the aqueous phase component is added. After confirming that the powder absorbed all the water phase components and did not energize with a tester, a binder 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)
About 10 expert panelists, when using each cosmetic, stretch, stickiness (evenly stretch and does not become uneven), non-stickiness, squeak, smooth feeling, makeup persistence, pore blurring effect and comprehensive evaluation 1 The sensory evaluation of 5 steps | paragraphs of 5 points | pieces was performed, the average score was calculated | required, and the following references | standards determined.
A: 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.

Claims (6)

  A skin cosmetic comprising (A) a water-absorbed porous powder and (B) zinc oxide, wherein at least the surface of the powder (A) is coated with a binder.   The skin cosmetic according to claim 1, wherein the binder contains an oil component.   The skin cosmetic according to claim 2, wherein the binder is an oil component containing a cross-linked organopolysiloxane.   The mass ratio of the total powder containing the porous powder (the total powder is the mass before water absorption) and the total binder is 1: 1 to 3: 5. The skin cosmetic according to Item.   The skin cosmetic according to any one of claims 1 to 4, wherein the water absorption capacity of the whole powder including the porous powder (the whole powder is before water absorption) is 50 to 150 mL / 100 g.   The skin cosmetic according to any one of claims 1 to 5, which is a sebum-removed or uneven concealed cosmetic.