JP2011051923A - Two-layer cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-layer cosmetic which is separated in two layers while having the thickness of a powder cake layer being controlled when the cosmetic is shaken and then stood still, kept separated also after being stood still, and is also excellent in re-dispersibility. <P>SOLUTION: The two-layer cosmetic contains (A) a cationic surfactant, preferably, &gamma;-gluconamide propyl dimethyl hydroxyethyl ammonium chloride, (B) a water swellable clay mineral, (C) a water insoluble powder and (D) an electrolyte. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a two-layer cosmetic.

  There are two-layer cosmetics such as liquid / liquid and liquid / solid, and many are used by shaking the container up and down during use. Specific liquid / liquid types include two-layer cleansing and two-layer emulsions composed of an aqueous layer and an oil layer, and the liquid / solid type includes a sunscreen containing an ultraviolet-resistant powder in the aqueous layer. There are lotions, calamine lotions that use the sebum adsorption effect and astringent effect of powder.

  As described above, liquid / solid type two-layer cosmetics often contain powder in the water layer, and the so-called caking that the powder easily solidifies on the bottom surface in the liquid layer after long-term storage. There is a problem. In addition, once the cake is formed, there is a problem that it becomes difficult to re-disperse the powder even if shaken again. In order to prevent this, it contains a two-layer lotion (see Patent Document 1) containing hydrophobic powder and volatile oil and / or ester oil, water-swelling clay mineral, powder, electrolyte, and water. Proposed are two-layer cosmetics (see Patent Document 2), powders, two-layer skin lotions (see Patent Document 3) containing a specific water-insoluble substance excluding the powder, and a polymer. .

  However, all of the above attempts are attempts to improve the redispersibility of the powder after caking, and do not suppress the caking of the powder. In addition, with the conventional technology, the preparation itself has not reached a level at which the state of the two layers can be controlled without caking, and it has been difficult to maintain a controlled two-layer separated state even after long-term storage.

Japanese Patent Laid-Open No. 7-267843 JP 2003-277229 A Japanese Patent Laid-Open No. 62-164608

  The present invention has been made in view of the above prior art, and when allowed to stand after shaking, the cake thickness of the powder layer can be controlled and separated, and the state can be maintained even after standing. At the same time, the object is to provide a two-layer cosmetic that is also excellent in redispersibility.

That is, the present invention
[1] A two-layer cosmetic comprising (A) a cationic surfactant, (B) a water-swellable clay mineral, (C) a water-insoluble powder, and (D) an electrolyte,
[2] The two-layer cosmetic according to [1], wherein the component (A) is γ-gluconamidopropyldimethylhydroxyethylammonium chloride,
[3] The two-layer cosmetic according to [1] or [2], wherein the component (B) is at least one selected from the group consisting of bentonite, hectorite, and laponite,
[4] The component [C] is characterized in that the component (C) is at least one selected from the group consisting of nylon, polystyrene, hydroxyapatite, silica, cellulose, titanium oxide and zinc oxide. The two-layer cosmetic according to any one of the above and [5] (D) component is at least one selected from the group consisting of sodium chloride, sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, and calcium chloride. The two-layer cosmetic according to any one of [1] to [4] above.

  When left standing after shaking, the two-layer cosmetic of the present invention has an excellent effect that the cake thickness of the powder layer is controlled and separated, and that state can be maintained even after standing. Moreover, since the two-layer cosmetic of the present invention suppresses caking, it has an effect of excellent redispersibility.

  Examples of the component (A) cationic surfactant include stearyltrimethylammonium chloride, cetyltrimethylammonium chloride, distearyldimethylammonium chloride, octadecyloxypropyltrimethylammonium chloride, and γ-gluconamidopropyldimethylhydroxyethylammonium chloride. Etc. These components (A) may be used alone or in appropriate combination of two or more.

  Suitable component (A) includes γ-gluconamidopropyldimethylhydroxyethylammonium chloride from the viewpoint of dispersing the powder, and commercially available products include “CERAPHYL 60” manufactured by ASP.

  Although the compounding quantity of the said (A) component is not specifically limited, Preferably it is 0.001-1 mass% in 2 layer type cosmetics, More preferably, it is 0.001-0.1 mass%. It is desirable. If the amount is less than 0.001% by mass, the dispersion power of the powder is insufficient, and if it exceeds 1% by mass, the cake of the powder layer becomes too thick, which is not preferable in terms of formulation characteristics.

  Examples of the water-swellable clay mineral as component (B) include smectites such as bentonite, montmorillonite, beidellite, nontronite, saponite, hectorite, soconite, stevensite; vermiculite, etc. It may be either a synthetic material or a synthetic material. These components (B) may be used singly or in appropriate combination of two or more.

  As a suitable component (B), it is preferable to use bentonite, hectorite, and laponite from the viewpoint of suppressing powder caking in a small amount without impairing the feeling of use.

  Although the compounding quantity of the said (B) component is not specifically limited, In a two-layer type cosmetics, Preferably it is 0.01-1 mass%, More preferably, it is 0.01-0.5 mass%. It is desirable. If the amount is less than 0.01% by mass, the effect of dispersing the powder cannot be obtained.

  Further, the mass ratio of the component (A) to the component (B) is preferably (A) / (B) = 0.002 to 1, and preferably 0.025 to 0.6. It is more preferable from the viewpoint of body sedimentation control.

  The water-insoluble powder of component (C) may be either an inorganic powder or an organic powder, and may be derived from any of natural products, granulated products, composite powders, and the like. The shape is not particularly limited, and examples thereof include a spherical shape, a flake shape, a plate shape, and a powder shape. These components (C) may be used alone or in appropriate combination of two or more. As a more preferable component (C), it is preferable to use organic powders such as nylon, polystyrene, hydroxyapatite, and cellulose; and inorganic powders such as silica, zinc oxide, and titanium oxide.

  The blending amount of the component (C) is not particularly limited, but is preferably 0.1 to 10% by mass, more preferably 0.5 to 8% by mass in the two-layer cosmetic. desirable. If it is less than 0.1% by mass, it lacks the smoothness peculiar to the powder, and if it exceeds 10% by mass, it is not preferable from the viewpoint that the coated part becomes white.

  The electrolyte of the component (D) may be any of monovalent, divalent, or trivalent or higher polyvalent metal salts, and it does not matter whether it is an inorganic salt or an organic salt. Examples of the salt used include sodium, potassium, calcium, magnesium, ammonium and the like. Specific examples of the component (D) include sodium chloride, calcium chloride, magnesium chloride, magnesium sulfate, alum, sodium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, ammonium chloride, sodium phosphate, disodium hydrogen phosphate, phosphoric acid 2 A sodium hydride etc. can be illustrated. These components (D) may be used alone or in appropriate combination of two or more. Among these, as a suitable (D) component, it is preferable to use sodium chloride, sodium phosphate, sodium hydrogenphosphate, and calcium chloride.

  (D) Although the compounding quantity of a component is not specifically limited, Preferably it is 0.001-1 mass% in 2 layer type cosmetics, More preferably, it is 0.02-0.8 mass%. Is desirable. If it is less than 0.001% by mass, caking occurs, and if it exceeds 1% by mass, it is not preferable from the viewpoint of stickiness during coating.

  In the two-layer type cosmetic according to the present invention, in addition to the components described above, glycerin, concentrated glycerin, diglycerin, polyglycerin, ethylene glycol, polyethylene glycol, propylene as long as the effects of the present invention are not impaired. Glycol, dipropylene glycol, 1,3-butylene glycol, glucose, maltose, maltose, sucrose, mannitol, sorbitol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, glucosyltrehalose, etc. Polyhydric alcohols; refreshing agents such as l-menthol, camphor, l-menthyl glyceryl ether; anionic surfactants, amphoteric surfactants, antioxidants, sequestering agents, silicones, vitamins, minerals, animal and plant extracts , Pearlizing agent, coloring agent, Seed perfumes, preservatives, germicides, anti-inflammatory agents, and the like may be appropriately blended according to the purpose of water.

  The production method of the two-layer cosmetic of the present invention can be prepared by a known method, for example, as follows. (B) The water-swellable clay mineral as the component was made into an aqueous solution and stirred and homogenized with a disper or the like, and the water-insoluble powder phase as the component (C) and the water-insoluble phase such as ethanol, fragrance, and menthol were uniformly dissolved. Add each of them and stir well with a disper. Then, it can prepare by adding and stirring (D) component, (A) component, etc.

  The two-layer cosmetic of the present invention can be used for any part of the skin such as body lotion for body, deodorant lotion; astringent lotion for face, oil control lotion and the like. Especially, it is more preferable to use as a facial lotion (lotion) from a viewpoint which is excellent in the refreshing feeling at the time of use, and is excellent in the suppression effect of sebum.

(Sample preparation)
According to the composition described in Table 1 and Table 2, two-layer cosmetics of Examples 1 to 5 and Comparative Examples 1 to 4 were prepared and subjected to the following evaluation test. In addition, storage was performed by leaving still at 25 degreeC room temperature on the desk without a vibration. The results are shown in Tables 1 and 2, respectively.

(Test Example 1: Appearance evaluation)
The Nerler tube having a mouth inner diameter of 25 mm and a length of 250 mm was filled with 100 mL of the two-layer cosmetic obtained in each Example and each Comparative Example, and then shaken 15 times at a speed of 20 cm scroll and 3 reciprocations / second. The number of shakes is calculated as one round trip. The state of appearance after standing at room temperature of 25 ° C. for 1 day was visually confirmed and evaluated according to the following evaluation criteria.

<Evaluation criteria for appearance>
A: The water layer and the powder layer are separated into two layers neatly, and the water layer is not turbid. B: The water layer and the powder layer are separated into two layers neatly, but the water layer is slightly turbid. Δ: The interface between the water layer and the powder layer is ambiguous, or a part of the powder floats above the water layer. X: The water layer and the powder layer are not separated, or the powder layer is divided into three layers. The

(Test Example 2: Evaluation of state stability over time)
The two-layer cosmetic obtained in each Example and each Comparative Example was filled in a transparent perfect circular PET container, and then shaken 15 times at a speed of 20 cm scroll and 3 reciprocations / second. The height of the powder layer after standing at room temperature of 25 ° C. for 3 days was measured. Next, the height of the powder layer after storage for 1 month under the same conditions was measured, and the ratio to the powder height after 3 days was evaluated according to the following evaluation criteria.

<Evaluation criteria for appearance stability over time>
◎ The thickness of the powder layer after 1 month is 80% or more of the powder height after 3 days ○ The thickness of the powder layer after 1 month is relative to the powder height after 3 days 50% or more to less than 80% Δ: The thickness of the powder layer after one month is 20% or more to less than 50% with respect to the powder height after three days × Thickness of the powder layer after one month Less than 20% of the powder height after 3 days

(Test Example 3; Evaluation of redispersibility)
The two-layer cosmetic obtained in each Example and each Comparative Example was filled in a transparent perfect circular PET container, and then shaken 15 times at a speed of 20 cm scroll and 3 reciprocations / second. After allowing to stand at a room temperature of 25 ° C. for 1 week and then shaking again under the conditions of 20 cm scroll and 1 reciprocation / second, the redispersibility was evaluated according to the following evaluation criteria.

<Evaluation criteria for redispersibility>
A: Re-dispersed by one shake ○: Re-dispersed by 2-4 shakes Δ: Re-dispersed by 5-10 shakes X: Re-dispersed by 11 or more shakes, Or do not disperse

  From the results of Table 1 and Table 2, when the two-layer cosmetics of each example were allowed to stand after shaking, the cake thickness of the powder layer was controlled and separated, and the state was maintained after standing. I understand that Moreover, since caking does not arise, it turns out that it is excellent also in redispersibility.

(Formulation Example 1; two-layer lotion)
Γ-Gluconamidopropyldimethyl hydroxyethylammonium chloride (60% aqueous solution) 0.02
Bentonite 0.2
Sodium chloride 0.2
Magnesium sulfate 0.1
Sodium phosphate 0.05
Silica 3.0
Ethanol 10.0
1,2-octanediol 0.5
Glucosyl trehalose 5.0
POE (40) hydrogenated castor oil 0.3
Chelating agent appropriate amount Antioxidant appropriate amount Menthol appropriate amount Perfume appropriate amount Preservative appropriate amount
Purified water remaining total 100.0

(Prescription Example 2; 2-layer body lotion)
Γ-Gluconamidopropyldimethyl hydroxyethylammonium chloride (60% aqueous solution) 0.01
Bentonite 0.2
Sodium chloride 0.2
Nylon 4.0
Ethanol 30.0
1,2-hexanediol 0.5
1,3-butylene glycol 3.0
Chelating agent appropriate amount Antioxidant appropriate amount Menthol appropriate amount Perfume appropriate amount Preservative appropriate amount
Purified water remaining total 100.0

Claims (5)

  A two-layer cosmetic comprising (A) a cationic surfactant, (B) a water-swellable clay mineral, (C) a water-insoluble powder, and (D) an electrolyte.   The two-layer cosmetic according to claim 1, wherein component (A) is γ-gluconamidopropyldimethylhydroxyethylammonium chloride.   The two-layer cosmetic according to claim 1 or 2, wherein the component (B) is at least one selected from the group consisting of bentonite, hectorite and laponite.   The component (C) is at least one selected from the group consisting of nylon, polystyrene, hydroxyapatite, silica, cellulose, titanium oxide, and zinc oxide. Layered cosmetics.   The component (D) is at least one selected from the group consisting of sodium chloride, sodium phosphate, disodium hydrogen phosphate, sodium dihydrogen phosphate, and calcium chloride. Two-layer cosmetics.