JP2001213724A - Double layer type cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double layer type cosmetic such as a make up remover which forms a stable two layer separation state through the separation at a moderate speed which does not influence the use in an emulsification state by shaking and which is excellent in sense of use. SOLUTION: The cosmetic is compounded with benzalkonium chloride of 0.005-0.024 weight %, ethanol of 0.5-20.0 weight % and further, a polyhydric alcohol such as butylene glycol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer cosmetic, and more particularly, to a two-layer cosmetic comprising two separate layers, an aqueous layer and an oily layer, which are separated into two layers with an appropriate time course after shaking. It relates to a layered cosmetic. The two-layer cosmetic of the present invention is suitably used particularly as a cosmetic for removing makeup, purifying the skin, or caring for the skin.

[0002]

2. Description of the Related Art Make-up cosmetics put on the market these days are very difficult to remove because they have an extremely excellent makeup effect. Regarding the removal fee for these makeup cosmetics,
It is roughly classified into an aqueous type, an oil type and an emulsified type, but each type has a drawback. That is,
The aqueous type makeup remover is excellent in terms of non-stickiness (cool feeling), but lacks its removing effect. In addition, the oily type having an excellent removing effect is sticky and has a problem in usability. Furthermore, the emulsification type is not sufficient in terms of non-stickiness due to the emulsifier and thickener in the formulation, while having excellent removal effect. It is conceivable to use a two-layer cosmetic as an attractive dosage form. A two-layer cosmetic is a cosmetic that is easily emulsified and mixed by shaking and stirring, but is easily re-separated upon standing.When using such a composition, it is necessary to emulsify each layer. The uniform emulsified state formed by this shaking should not be irreversible. After use, it is necessary to completely separate into two layers in the same state as before use, while it is necessary to maintain an emulsified state at least during use. For this reason, it is also necessary that the uniform state be maintained for a certain period of time.

[0003] Such a two-layer makeup remover is disclosed in, for example, JP-A-6-21628 and JP-A-10-21028.
-95709. This two-layer cosmetic contains benzalkonium chloride in a composition containing an emulsifier in an aqueous layer or an oily layer, or both, and has excellent two-layer separation properties, removal effects, and usability. It is said that there is. However, in consideration of skin irritation and safety, it is preferable that the composition contains a small amount of emulsifier or no emulsifier. Therefore, as a result of diligent research, by including a specific amount of benzalkonium chloride and ethanol in the aqueous layer, it was quickly emulsified by shaking without using an emulsifier other than benzalkonium chloride, and over time. The present inventors have found that a safe and easy-to-use two-layer cosmetic composition which forms a stable two-layer separation state can be obtained, and the present invention has been accomplished.

[0004]

That is, the present invention provides a two-layer cosmetic comprising a mixture of benzalkonium chloride and a lower alcohol, and a benzalkonium chloride, a lower alcohol, A two-layer cosmetic characterized by being blended with a polyhydric alcohol.

The benzalkonium chloride used in the present invention is an alkyldimethylbenzylammonium chloride represented by the following general formula (1), and one or a mixture of two or more thereof is used. Examples of commercially available products include Catinal MB-48A (trade name, manufactured by Toho Chemical Industry Co., Ltd.) and benzalkonium chloride (trade name, manufactured by Fluka).

[0006]

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(Wherein, R represents a saturated linear alkyl group having 8 to 18 carbon atoms.) The amount of benzalkonium chloride used in the two-layer cosmetic of the present invention is 0.005 to 0.005. The content is preferably 0.024% by weight, more preferably 0.01 to 0.02% by weight.
Separation at an appropriate speed is impaired whether the blending amount of benzalkonium chloride is large or small, and if it is large, safety such as irritation to skin and eyes may be concerned.

[0008] The lower alcohol used in the two-layer cosmetic of the present invention is preferably ethanol. The compounding amount is preferably 0.5 to 20.0% by weight, more preferably 1.0 to 10.0% by weight. If the amount of the lower alcohol is small, an appropriate separation speed is impaired, and the detergency and the usability (non-stickiness) are poor. Conversely, if there is too much, there is concern about safety such as irritation to the skin and eyes.

According to the present invention, by further blending a polyhydric alcohol, the formation of an emulsified state after shaking and the subsequent separation speed become more favorable. The polyhydric alcohol blended in the cosmetic is not particularly limited, and for example, the following polyhydric alcohols can be blended.

Examples of the polyhydric alcohol include dihydric alcohols such as ethylene glycol, propylene glycol, 1,3-butylene glycol and hexylene glycol, trihydric alcohols such as glycerin, and tetrahydric alcohols such as pentaerythritol. Pentahydric alcohols such as xylitol, hexahydric alcohols such as sorbitol and mannitol, polyhydric alcohol polymers such as diethylene glycol, dipropylene glycol, diglycerin and polyethylene glycol, ethylene glycol monomethyl ether, ethylene glycol dibutyl ether and the like. And polyhydric alcohols such as trivalent alcohol alkyl ethers such as divalent alcohol alkyl ethers and diethylene glycol monomethyl ether. Of these polyhydric alcohols, 1,3-butylene glycol is particularly preferred.

The compounding amount of the polyhydric alcohol in the two-layer cosmetic of the present invention is 0.1 to 20.0 with respect to the total amount of the cosmetic.
% By weight is preferred, more preferably from 5.0 to 15.0.
% By weight.

In the present invention, oil and water are added in addition to the above essential components. The oil used in the present invention is
There is no particular limitation, and for example, the following oil components can be blended.

Examples of liquid fats and oils include avocado oil,
Camellia oil, turtle oil, macadamia nut oil, corn oil, mink oil, olive oil, rapeseed oil, egg yolk oil, sesame oil, persic oil, wheat germ oil, sasanqua oil, castor oil, linseed oil, safflower oil, cottonseed oil, eno oil, Soybean oil, peanut oil, teaseed oil, kaya oil, rice bran oil, sinagiri oil, Japanese kiri oil, jojoba oil, germ oil, triglycerin,
As solid fats and oils such as glycerin trioctanoate and glyceryl tripalmitate, for example, cocoa butter, coconut oil,
Horse fat, hardened coconut oil, palm oil, tallow, sheep fat, hardened tallow,
Examples of hydrocarbon oils such as palm kernel oil, lard, beef bone fat, mokuro kernel oil, hydrogenated oil, beef tallow, mokuro, hydrogenated castor oil, etc. Examples of synthetic ester oils such as petrolatum and microcrystalline wax include, for example, isopropyl myristate, cetyl octoate, octyldodecyl myristate, isopropyl palmitate, butyl stearate, hexyl laurate, myristyl myristate, decyl oleate, dimethyloctane Hexyldecyl acid, cetyl lactate, myristyl lactate, lanolin acetate, isocetyl stearate, isocetyl isostearate, cholesteryl 12-hydroxystearate, ethylene glycol di-2-ethylhexylate, dipentae Suritoru fatty acid ester, N- alkyl glycol monoisostearate, neopentyl glycol dicaprate, diisostearyl malate, glyceryl di-2-heptylundecanoate, tri -
Trimethylolpropane 2-ethylhexylate, trimethylolpropane triisostearate, tetra-2-
Pentane erythritol ethylhexylate, tri-2-
Glycerin ethylhexylate, cetyl-2-ethylhexanoate, 2-ethylhexyl palmitate, glyceryl trimyristate, glyceride tri-2-heptylundecanoate, castor oil fatty acid methyl ester, oleic acid oil, cetostearyl alcohol, acetoglyceride, 2-heptylundecyl palmitate, diisobutyl adipate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, adipic acid-2
-Heptylundecyl, ethyl laurate, di-2-ethylhexyl sebacate, 2-hexyldecyl myristate, 2-hexyldecyl palmitate, 2-hexyldecyl adipate, diisopropyl sebacate,
Examples of silicone such as 2-ethylhexyl succinate, ethyl acetate, butyl acetate, amyl acetate, and triethyl citrate include linear polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane and methylhydrogenpolysiloxane, and decamethylpolysiloxane. Oils such as cyclic polysiloxanes such as siloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane are exemplified.

The amount of the oily layer in the two-layer cosmetic of the present invention is preferably 1.0 to 80.0% by weight, more preferably 10.0 to 60.0% by weight, based on the total amount of the cosmetic. is there.

The amount of the aqueous layer used in the present invention is 2
0.0 to 99.0% by weight, particularly 40.0 to 90.0% by weight is preferred.

In the two-layer cosmetic of the present invention, in addition to the above-mentioned components, if necessary, a humectant, an ultraviolet absorber, a fragrance, an antioxidant, an antiseptic and a sunscreen, an extender pigment, a coloring pigment, etc. Components used in cosmetics can be blended within a range that does not impair the effects of the invention.

The two-layer cosmetic of the present invention can be made into a uniform emulsified state by shaking without containing an emulsifier of which safety is a concern, and then a stable two-layer separated state is formed by standing still. . Therefore, the two-layer cosmetic of the present invention preferably does not substantially contain an emulsifier, and is suitably applied to a makeup remover.

[0018]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Comparative Examples of the two-layer cosmetic of the present invention, but these do not limit the present invention at all. In the following examples, “%” indicates “% by weight” unless otherwise specified, and numerical values in the composition table also indicate “% by weight”.

Examples 1 to 6 and Comparative Examples 1 to 7 Point makeup removers having the compositions shown in Tables 1 to 3 were prepared by the methods described below, and used as Examples 1 to 6 and Comparative Examples 1 to 7.

[0020]

[Table 1] {Example 1 2 3 4 5 6}シ ク ロ Cyclomethicone 36.0 36.0 36.0 36.0 36.0 36.0 Neopentyl glycol dicaprate 2.0 2.0 2.0 2.0 2.0 2.0 Cetyl octoate 2.0 2.0 2.0 2.0 2.0 2.0 Green 202 No. 0.015 0.015 0.015 1,3-butylene glycol 10.0---10.0 10.0 Glycerin--10.0---Dipropylene glycol------Hexylene glycol---10.0--Propylene glycol------Pentangi ------Ethanol 5.0 5.0 5.0 5.0 5.0 5.0 PEG / PPG copolymer * 1-----0.05 PEG / PPG copolymer * 2----0.05-─────── ────────────────────────────

[0021]

[Table 2] {Comparative Example 1 2 3 4}シ ク ロ Cyclomethicone 36.0 36.0 36.0 36.0 Neopentyl glycol dicaprate 2.0 2.0 2.0 2.0 Cetyl octoate 2.0 2.0 2.0 2.0 Green 202 0.0002 0.0002 0.0002 0.0002 Deionized water residue Residue Residual Residual NaCl 0.5 0.5 0.5 0.5 Methyl paraben 0.2 0.2 0.2 0.2 Benzalkonium chloride 0.015 0.015 0.015 0.015 1,3-butylene glycol 10.0 10.0-0.3 Glycerin----Dipropylene glycol----Hexylene glycol--10.0- Propylene glycol----Pentanediol----Ethanol----PEG / PPG copolymer * 1----PEG / PPG copolymer * 2 0.05-0.05 0.06 ─── ────────────────────────

[0022]

[Table 3]

* 1 = Polyethylene glycol / polypropylene glycol (20/30) copolymer * 2 = Polyethylene glycol / polypropylene glycol (35/40) copolymer

(1) Production method of Example 1 Cyclomethicone, neopentyl glycol dicaprate, cetyl octoate and Green No. 202 were uniformly dissolved.
This is an oily layer. Next, after dissolving methyl paraben in ethanol, ion-exchanged water, NaCl, benzalkonium chloride, 1,3-butylene glycol, and ethanol are added and uniformly dissolved to form an aqueous layer. An appropriate container was filled with each layer to obtain a desired point makeup remover.

(2) Production method of Examples 2 to 6 and Comparative examples 1 to 7 A point makeup remover was obtained according to the production method of Example 1.

Next, the ease of mixing when these point makeup removers are shaken, the separation speed at the oil-water interface after shaking, the state after separation, the female professional panel (10
) Was evaluated by the methods described below. Table 4 shows the results.

(1) Ease of Mixing Each sample was filled into a container, and the contents were shaken 10 times to evaluate the state of mixing. A: Uniformly mixed. ：: Somewhat uniform mixing. Δ: Slightly unevenly mixed. ×: Non-uniform mixing.

(2) Evaluation of separation speed after shaking Each sample was filled in a container, the contents were shaken ten times and mixed, and then the time required for separation was evaluated. ◎: 5 to 15 minutes ○: 3 to 5 minutes or 15 minutes to 1 hour △: 1 to 3 minutes or 1 hour to 24 hours ×: Within 1 minute or 24 hours or more

(3) Evaluation of state after separation The state of each layer and interface after separation was evaluated. A: No change from before mixing. ：: slightly cloudy Δ: Cloudy, small amount of emulsion at interface. X: There is an emulsion at the interface.

(4) Evaluation of Detergency A panel of 10 persons evaluated the detergency against the waterproof type mascara according to the following criteria, and the results were averaged. (Criterion) 4: Fall well. 3: Slightly falls. 2: Does not fall much. 1: Does not fall. (Evaluation) ：: 3.5 or more ：: 2.5 or more, less than 3.5 Δ: 1.5 or more, less than 2.5 ×: less than 1.5

(5) Evaluation of usability The usability was evaluated according to the following criteria in actual use by 10 panels, and the results were averaged. (Criterion) 4: Not sticky. 3: Not very sticky. 2: Slightly sticky. 1: Sticky. (Evaluation) ：: 3.5 or more ：: 2.5 or more, less than 3.5 Δ: 1.5 or more, less than 2.5 ×: less than 1.5

[0032]

[Table 4] ─────────────────────────────────── Example Comparative Example ─────── {1 2 3 4 5 6 6 1 2 3 4 5 6 7 ...容易 Ease of mixing ◎ ◎ ○ ◎ ◎ ◎ ○ ○ ○ ○ ○ ○ ○ Separation speed ◎ ○ ○ ○ △ ○ △ △ △ △ △ △ × After separation ◎ ○ ◎ ◎ △ ○ △ ○ △ △ × × △ Detergency ◎ ◎ ◎ ◎ ◎ ◎ ◎ ○ ○ ○ ○ ○ ○ ◎ Usability ◎ ◎ ○ ◎ △ △ × △ × × × × ◎ ───── ──────────────────────────────

Next, in order to make the two-layer cosmetic of the present invention more specific, examples will be further shown. Of course, they do not limit the invention in any way. And these manufacturing methods are in accordance with Example 1.

Example 7 Lotion for Two-Layer Type Body Ion-exchanged Water Balance 1,3-butylene glycol 10.0% by weight Ethanol 10.0 Benzalkonium chloride 0.015 Preservatives Appropriate Colorant Appropriate Cyclomethicone 20.0 Liquid paraffin 15.0 Glyceryl tri-2-ethylhexanoate 10.0 Olive oil 5.0

Example 8 Two-layer sun lotion Ion-exchanged water Balance 1,3-butylene glycol 10.0% by weight Ethanol 10.0 Benzalkonium chloride 0.015 Preservative Appropriate amount Colorant Appropriate amount Paraffin 5.0 Glyceryl tri-2-ethylhexanoate 5.0 2-Ethylhexyl paramethoxycinnamate 5.0

[0036]

As described above, the two-layer cosmetic of the present invention forms a stable two-layer separated state by separating at an appropriate speed which does not affect the use in the emulsified state by shaking, and It is also excellent in usability. For this reason, it is particularly suitably used as a makeup remover, a skin cleanser, or a care cosmetic.

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Claims (6)

[Claims] 1. A two-layer cosmetic comprising a mixture of benzalkonium chloride and a lower alcohol. 2. A two-layer cosmetic comprising a mixture of benzalkonium chloride, a lower alcohol and a polyhydric alcohol. 3. The two-layer cosmetic according to claim 2, wherein the polyhydric alcohol is butylene glycol. 4. The compounding amount of benzalkonium chloride is 0.0
The two-layer cosmetic according to claim 1 or 2, wherein the amount of the lower alcohol is 0.5 to 20.0% by weight. 5. The two-layer cosmetic according to claim 1, which does not substantially contain an emulsifier. 6. The two-layer cosmetic according to claim 1, which is a makeup remover.