KR20050053922A - Water in oil form cosmetic composition - Google Patents

Abstract

The present invention relates to a water-in-oil cosmetic composition that does not contain an emulsifier, and has excellent long-term storage stability by including silica silylate instead of an emulsifier in the oil phase component, has no skin irritation by the emulsifier, and is highly usable when applied to the skin. It provides an excellent water-in-oil cosmetic composition.

Description

Water-in-oil type cosmetic composition {WATER IN OIL FORM COSMETIC COMPOSITION}

The present invention relates to a water-in-oil cosmetic composition that does not contain an emulsifier, and more particularly, silica silylate particles are arranged at the interface between the sap droplets of the inner phase and the oil phase of the outer phase, and stabilize the dispersion of the liquid droplets for long-term storage stability. The present invention relates to a water-in-oil cosmetic composition which is excellent, has excellent usability when applied to the skin, and has little skin irritation.

The general cosmetic composition is classified into two emulsions: oil-in-water type using hydrophilic emulsifier and water-in-oil type using lipophilic emulsifier. The oil-in-water type has a light, matte feeling, easy to manufacture and excellent dispersion stability. It is most commonly used as a general cosmetic composition. However, oil-in-water cosmetics have a disadvantage in that the water resistance is poor and the stickiness and absorption is slowed by the use of a thickener to ensure long-term stability of the cosmetic, and the skin irritation by the emulsifier.

On the other hand, the water-in-oil type has the advantage that it can impart various functions because the trauma is oil, and can improve the durability of makeup by increasing the water resistance. There is a feeling of heavy use and stickiness, there is a problem of low long-term stability of the emulsion (European Patent No. 0770379).

Accordingly, efforts have been made to overcome the problem of long-term stability by using a silicone-based emulsifier in water-in-oil emulsion.

Specifically, for example, US Patent No. 5,942, 213 is a gelling agent or wax is added to oil and water, and the silicone oil is blended up to 40% by using a silicone-based emulsifier for 3 months from 45 ℃ to 4 ℃ A method for preparing a water-in-oil emulsion, which is stable even with temperature changes, is proposed. However, these water-in-oil emulsions have excellent cosmetic durability with their external appearance as oil components, but because of HLB (Hydrophile-lipophile Balance) 2 to 6 silicone-based emulsifiers, there is a heavy feeling of use and skin irritation and you want to erase your makeup. When you have a disadvantage that is not erased well.

Instead of using an emulsifier to solve the drawbacks of the water-in-oil cosmetics according to the use of the HLB (Hydrophile-lipophile Balance), using the powder, that is, particles having an amphiphilic surface (long-term stability and skin safety) In recent years, researches are being actively conducted (US Pat. Nos. 6585983, 6579529, 6410035, 6391321, 6440399, and Japanese Patent Laid-Open Nos. 2000-095639 and 2000-095638).

The particles having an amphipathic surface composition used in the prior art are classified into two kinds of surface-treated powders and composite powders. Surface-treated powder is a powder that is partially coated with silicon polymer on the surface of inorganic particles such as talc, silica, titanium dioxide, zinc, etc. and co-treated with surface hydroxyl group and alkyl group on the surface of the particle to have an amphiphilic surface. It is a powder which is treated to have an amphipathic surface by polymerizing polysiloxane as a mother particle and coating an inorganic oxide thereon as a child particle to coexist with an alkyl group on the surface of the mother particle and a hydroxyl group on the surface of the particle. However, in the case of surface treated inorganic particles, it is easy to control particle size and surface composition, but it is very difficult to stabilize the dispersion because the silicone polymer adsorbed on the surface is easily peeled off and the specific gravity of inorganic particles is large. In the case of particles, since the fine particles are used as the parent particles, there is a problem that it is impossible to control the particles to a smaller particle size. As a result, there is a problem in that the long-term stability of the emulsion is not secured and commercialized.

In order to solve the above problems, an object of the present invention is to improve the disadvantages of the heavy feeling of water-in-oil type emulsification and the disadvantages that are not easily erased when you want to remove makeup to provide a light and matte feeling, such as oil-in-water cosmetics, skin It is to provide a water-in-oil cosmetic composition that is excellent in long-term emulsification stability and safe for the skin without using an emulsifier that is a provoking ingredient.

In order to achieve the above object, the present invention provides a water-in-oil cosmetic composition comprising 5 to 90 parts by weight of an oil phase component, and 10 to 95 parts by weight of an aqueous phase component containing silica silylate.

In addition, the present invention is to prepare an oil phase by dispersing silica silyl having an average particle size of 500 nm or less and a particle surface silanol concentration of 20 to 80% by 0.05 to 10 parts by weight relative to the total weight of the composition.

Silica silylate particles are injected into the oil phase to provide a method for preparing a water-in-oil cosmetic composition arranged at an interface between an aqueous phase droplet and an external oil.

Hereinafter, the present invention will be described in more detail.

The water-in-oil cosmetic composition of the present invention contains silica silylate instead of an emulsifier to improve the heavy feeling of use by the emulsifier, in particular, in the cosmetics for the purpose of UV protection, there is no skin photostimulation, and the oily component up to 90 It can contain up to%, while having excellent persistence, can be easily erased when erased, and can provide a unique feeling when applied to the skin.

The water-in-oil cosmetic composition of the present invention contains 5 to 90 parts by weight of an oil phase component containing silica sillate, and 10 to 95 parts by weight of an aqueous phase component containing a water-soluble component. That is, in the water-in-oil cosmetic composition according to the present invention, the ratio of the oil phase component [A] and the water phase component [B] (ratio of [A] / [B]) is preferably from 0.05 to 9.0, more preferably from 0.1 to 3.0 is excellent in long-term storage stability, skin safety and usability. At this time, if the ratio of the oil phase / water phase is less than 0.05, the oil phase ratio of the oil phase is too small compared to the aqueous phase, and the oil-in-water type emulsion is not manufactured. do.

Particularly, in the present invention, the silica silylate contained in the oil phase component has a part of the hydroxyl group (hydroxyl, -OH) of silanol (silanol, SiOH) located on the surface of the hydrophilic silica represented by the general formula [SiO ₂ ]. It is prepared by substitution with a siloxane (trimethylsiloxyl, -OSi (CH ₃ ) ₃ ) group. Since the silica silylate has an amphiphilic surface according to the silanol concentration of the particle surface, it may be arranged at the interface between oil and water to stabilize dispersion of the sap droplets.

In this case, since the specific surface area of the silica silylate increases as the particle size increases, a large amount of silica silylate is required to emulsify the stability. Therefore, the smaller the particle size can form a stable water-in-oil emulsion, the average size of the silica silylate particles used in the present invention for this purpose is 500 nm or less, the concentration of the particle surface silanol is 20 It is preferable that it is-80%.

The content of the silica silylate contained in the oil phase component is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 8 parts by weight based on the total weight of the composition. When the content of the silica silylate is less than 0.05 parts by weight, it may not serve as an emulsifier, and when it exceeds 10 parts by weight, it is difficult to prepare an emulsion because of too much powder.

The oil phase of the present invention includes 5 to 90 parts by weight of the oil component relative to the total weight of the composition, in addition to the silica silylate. 10 parts by weight may be included.

The oil component used in the present invention can be used by selecting one or more from the group consisting of vegetable, mineral, silicone oil, and synthetic oil.

The aqueous phase of the present invention may include 0.01 to 50 parts by weight of a moisturizer, 0.001 to 50 parts by weight of lower ethanol to give a refreshing feeling, and 0.001 to 10 parts by weight of an electrolyte compound to improve stability. Can be.

In addition, the cosmetic composition of the present invention is octylmethoxycinnamate, octylsalicylate, octocrylene, butylmethoxydibenzoylmethane, oxybenzone, octyltriazone, menthyl anthranilate, and 3 for the purpose of UV protection. 0.1 to 50 parts by weight of an organic ultraviolet ray shielding agent such as, 4-methylbenzylidene camphor, and 0.1 to 50 parts by weight of an inorganic metal blocking agent such as titanium dioxide, zinc oxide, and iron oxide may be further included as one or more kinds based on the total weight of the composition. .

The cosmetic composition may further include ordinary ingredients, such as water, moisturizers, lower alcohols, thickeners, chelating agents, pigments, preservatives, fragrances, etc., which are blended into general skin cosmetics as needed.

The method for producing a water-in-oil cosmetic composition of the present invention is to disperse silica silylate particles in an oil phase, and to add an aqueous phase, so that the silica silylate particles are sap droplets in which an inner phase and oil of a traumatic oil. A method for preparing a water-in-oil emulsion of a stable form arranged at the interface is provided.

The water-in-oil emulsion prepared by the method of the present invention is excellent in stability because the size of the water droplets is adjusted to 0.1 to 100 μm. That is, the larger the particles of the emulsion, the greater the aggregation or coalescence, the lower the stability of the emulsion. The water-in-oil cosmetic of the present invention is very excellent in stability because the particle size is controlled in the above-mentioned range by using silica silylate.

The cosmetic composition of the present invention is used for the skin, and is usually used for nutrient emulsions, nutrient creams, massage creams, essences, packs, skin adhesive patches, skin adhesive gels, powders, ointments, suspensions, emulsions, sprays, or cosmetic liquids. It may be prepared in the form of a cosmetic, and may include various conventional carriers and additives suitable for each of these formulations and well known in the art. In addition, the cosmetic composition may be made of a skin contact material in contact with the skin, such as cosmetics, detergents, and fibers.

Hereinafter, the present invention will be described in more detail with reference to Examples, and the present invention is not limited to these Examples.

<Examples 1 to 4 and Comparative Examples 1 to 2>

According to the components and contents as shown in Table 1 below, oil phase and water phase components were prepared at room temperature to 80 ° C., and then mixed, and fragrance and additives were mixed at 50 ° C. or lower to prepare a water-in-oil cosmetic.

Manufacturing method

(1) The oil phase components were mixed uniformly.

(2) The aqueous phase components were mixed uniformly.

(3) and (2) were gradually added to (1) under stirring to obtain a water-in-oil emulsion.

division Raw material name Content (parts by weight) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Yu Sang  Cyclomethicone 20.0 20.0 20.0 20.0 20.0 20.0  Octylhexanoate 5.0 5.0 5.0 5.0 5.0 5.0  Dimethicone 1.0 1.0 1.0 1.0 1.0 1.0  Disteadimonium hectorite 0.5 0.5 0.5 0.5 0.5 0.5  Dimethicone / Vinyl Dimethicone Concross Polymer 0.5 0.5 0.5 0.5 0.5 0.5  Silica silylate 1.0 0.5 0.1 0.05 - -  Dimethicone Copolyol - - - - - 1.0 Awards  Purified water To 100 To 100 To 100 To 100 To 100 To 100  ethanol 5.0 5.0 5.0 5.0 5.0 5.0  Magnesium sulfate 1.0 1.0 1.0 1.0 1.0 1.0  glycerin 2.0 2.0 2.0 2.0 2.0 2.0  Propylene glycol 3.0 3.0 3.0 3.0 3.0 3.0  Butylene glycol 2.0 2.0 2.0 2.0 2.0 2.0 additive  incense Quantity Quantity Quantity Quantity Quantity Quantity  antiseptic Quantity Quantity Quantity Quantity Quantity Quantity

Experimental Example 1: Stability Test

In order to compare the uniformity of the water-in-oil cosmetics prepared in Examples 1 to 4 and Comparative Examples 1 to 2 and the particle size of the liquid droplets, they were measured by an optical microscope, and were allowed to stand for 1 month and 3 months at a temperature change of 50 ° C. to minus 15 ° C. The emulsion stability was tested by evaluating the separation state, and the results are shown in Table 2.

division Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Sap Drop Particle Size (㎛) One 10 50 2000 Not measurable One Room temperature ○ ○ ○ × × ○ 15 degrees below zero ○ ○ ○ × × ○ 0 ℃ ○ ○ ○ × × ○ 40 ℃ ○ ○ ○ × × ○ 50 ℃ ○ ○ ○ × × ○  ○: good, △: normal, ×: separation

As can be seen in Table 2, in Comparative Example 1 without using a silica silylate (silica silylate) or an emulsifier (dimethicone cocopolyol) it can be seen that no water-in-oil cosmetics are prepared, silica silylate (silica silylate) When the amount is less than 0.1% by weight, it can be seen that the size of the sap droplets is considerably large and the emulsion state becomes unstable (Example 4). It can be seen that.

Experimental Example 3: Feeling

To make 50 women 20 to 40 years of age according to the Examples and Comparative Examples of Table 1, apply lightly and lightly, less oily feeling and the effect of makeup persistence after makeup It was made to evaluate about washability when doing so. Table 3 shows the results of the sensory evaluation in this way. The sensory evaluation is performed based on the criteria of very good (5 points), excellent (3 points), normal (0 points), bad (-3 points), very bad (-5 points) and the rating is the following equation 1 And the results are shown in Table 3.

(Equation 1)

Rating = [(Excellent Number of Persons × 5) + (Excellent Number of Persons × 3) + (Normal Number of Persons × 0) + (Poor Number of Persons × (-3)) + (Very Low Number of Persons ×× -5)] / Number of Ratings

Example 1 Example 2 Example 3 Comparative Example 2  Freshness 3.9 3.8 3.0 2.3  Bundle 4.0 4.3 4.8 3.0  Makeup persistence 4.2 4.1 4.0 4.5  Detergency 3.9 4.0 4.1 1.6  Overall satisfaction 4.00 4.05 3.98 2.85

From the results of Table 3, in Example 1 to 3 prepared using the silica silylate (silica silylate) than in Comparative Example 2 prepared using a silicone-based emulsifier, excellent in the feeling of freshness, such as shine and the makeup lasting effect and cleaning Results were obtained and the overall satisfaction was superior. When emulsified using silica silylate, it could improve the greasy and sticky feeling of emulsifier when applied to the skin. Also, when you want to remove makeup, cleanability is excellent because it does not use emulsifier. Judging.

<Experimental Example 4: Primary irritation test on human body (closed patch)>

In order to determine the safety and stimulation of the human body of Example 1 and Comparative Example 2, a primary stimulation test was performed on the human body through a human patch test as follows. CTFA guidelines for 50 healthy men and women [Ref. The Cosmetic, Toility and Fragrance Association. Inc. Washington, D.C., 20036, 1991]. 15 μl of the sample and the solution were added dropwise to the Finn Chamber, which was placed on the back of the human body, which was the test site, and fixed with tape. Subsequently, after patching for 24 hours, after removing the patch and passing 4 hours again, the skin reaction of the test site was determined according to the following criteria, and the results are shown in Table 4.

(Criteria)

－: No erythema or unusual phenomenon

±: slightly reddish

+: Significantly redder than the surroundings

++: reddening and swelling worse than the surroundings

(Equation 2)

Stimulus = [{(±) Number × 1} + {(+) Number × 2} + {(++) Number × 3}] / Number of Subjects

division Number of test subjects Judgment result Stimulus ++ + ± - Example 1 50 0 0 3 47 0.06 Comparative Example 2 50 0 2 5 43 0.18

As can be seen from Table 4, it can be seen that the skin irritation is much reduced compared to Comparative Example 2 using the emulsifier in Example 1 containing no emulsifier.

<Example 5 and Comparative Examples 3 to 4>

The oil and water phases were prepared at 80 ° C. and then mixed, and the fragrances and additives were mixed at 50 ° C. or less with the same ingredients and contents as those shown in Table 5 below (Example 5 and Comparative Example 3). And an oil-in-water type sunscreen cosmetic (Comparative Example 4) were prepared.

Example 5 and Comparative Example 3

(1) The oil phase component and the sunscreen were mixed uniformly.

(2) The aqueous phase components were mixed uniformly.

(3) and (2) were gradually added to (1) under stirring to obtain a water-in-oil emulsion.

Comparative Example 4

(1) The oil phase component and the sunscreen were mixed uniformly.

(2) The aqueous phase components were mixed uniformly.

(3) and (1) were gradually added to (2) under stirring to obtain an oil-in-water emulsion.

division Raw material name Content (parts by weight) Example 5 Comparative Example 3 Comparative Example 4 Yu Sang  Cyclomethicone 20.0 20.0 20.0  Octylhexanoate 1.0 1.0 1.0  Disteadimonium hectorite 0.5 0.5 0.5  Dimethicone / Vinyl Dimethicone Crosspolymer 3.0 3.0 3.0  Dimethicone 1.0 1.0 1.0  Silica silicate 0.5 - -  Dimethicone Copolyol - 1.0 1.0  Fiji 30 dipolyhydroxy stearate - - 1.0  Polysorbate 60 - - 2.0 Awards  Purified water To 100 To 100 To 100  ethanol 5.0 5.0 5.0  Magnesium sulfate 1.0 1.0 1.0  glycerin 2.0 2.0 2.0  Propylene glycol 3.0 3.0 3.0  Butylene glycol 2.0 2.0 2.0 Sunscreen  Octylmethoxycinnamate 5.0 5.0 5.0  Octocrylene 2.0 2.0 2.0  Ultrafine Titanium Dioxide 3.0 3.0 3.0 additive  incense Quantity Quantity Quantity  antiseptic Quantity Quantity Quantity

<Experimental example 5: evaluation of makeup lasting sunscreen>

100 mg of the water-in-oil cosmetics of Examples 5 and Comparative Example 3 and the oil-in-water type sunscreen cosmetics of Comparative Example 4 were applied to Vitroskin in an area of 50 cm 2, and then dried for 20 minutes in clean water at 25 ° C. After immersion for 40 minutes while reciprocating and dried again for 20 minutes. The in vitro SPF analysis of Vitroskin before and after immersion using SPF290s analyzer is shown in Table 6.

Example 5 Comparative Example 3 Comparative Example 4 (In vitro SPF after immersion / in vitro SPF before immersion) 0.96 ± 0.02 0.97 ± 0.02 0.40 ± 0.02

As shown in Table 6, Example 5, which is a water-in-oil type sunscreen cosmetic without using an emulsifier, compares the water-in-oil type sunscreen cosmetic using a silicone-based emulsifier and maintains an in vitro SPF value of 90% or more when compared to before and after immersion in water. Compared to Example 3, the in vitro SPF value was shown to be equivalent, whereas Comparative Example 4, which is an oil-in-water type sunscreen cosmetic, had an in vitro SPF value of 40% when compared to before and after immersion in water. It can be seen that the relative drops. In other words, UV-sustaining effect was also produced by using a water-in-oil-type sunscreen cosmetics using silica silylate (silica silylate), so that the sunscreen effect by the water or sweat hardly deteriorated, it was shown that the sunscreen effect can be continued.

As described above, it is possible to prepare a water-in-oil cosmetic composition that is stable by silica silylate without using an emulsifier, thereby improving the disadvantages by the emulsifier and improve the heavy feeling of water-in-oil cosmetics and toilet paper It is possible to prepare a water-in-oil cosmetic that can be easily erased while retaining its properties. In addition, the water-in-oil type cosmetics of the present application do not have skin irritation and also use a wax used for securing stability in the existing water-in-oil type cosmetics, and instead, may realize a light and matte feeling that a silica silylate powder has.

Claims (8)

A water-in-oil cosmetic composition comprising 5 to 90 parts by weight of an oil phase component containing silica sillate, and 10 to 95 parts by weight of an aqueous phase component. The water-in-oil cosmetic composition according to claim 1, wherein the silica silylate is included in an amount of 0.05 to 10 parts by weight based on the total weight of the composition. The water-in-oil cosmetic composition according to claim 1, wherein the silica silylate has an average particle size of 500 nm or less and a particle surface silanol concentration of 20 to 80%. The water-in-oil cosmetic composition according to claim 1, wherein the oil phase further comprises 5 to 90 parts by weight of oil components, 0.001 to 10 parts by weight of oil-soluble bentonite, and 0.001 to 10 parts by weight of oil-soluble polymer. The water-in-oil cosmetic composition according to claim 1, wherein the aqueous phase further comprises 0.01 to 50 parts by weight of a moisturizer, 0.001 to 20 parts by weight of lower alcohol, 0.001 to 10 parts by weight of an electrolyte compound, and a residual amount of water. The water-in-oil cosmetic composition according to claim 1, wherein the water-in-oil cosmetic composition further comprises at least one additive selected from an organic sunscreen agent and an inorganic metal barrier agent. An oil phase was prepared by dispersing a silica silylate having an average particle size of 500 nm or less and a particle surface silanol concentration of 20 to 80% based on 0.05 to 10 parts by weight based on the total weight of the composition. A method for producing a water-in-oil cosmetic composition in which the aqueous phase is introduced into the oil phase, and the silica silylate particles are arranged at the interface between the droplet of the inner phase and the oil of the outer phase. The method of claim 7, wherein the size of the liquid droplets is adjusted to 0.1 to 100 ㎛.