JP2001097841A - Two-layered cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a two-layered cosmetic which does not contain a lower alcohol such as ethanol or isopropyl alcohol, does not give an uncomfortable touch, and has an excellent reemulsifying property before use an excellent two layer-separating property after use, a beautiful appearance and high safety. SOLUTION: This two-layered cosmetic contains one or more esters selected from polyoxyethylenesorbitan fatty acid esters and sorbitan fatty acid esters, sodium citrate, and one or more water-soluble polymers. The two-layered cosmetic preferably further contains copper chlorophyll.

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 containing no lower alcohols such as ethanol and isopropyl alcohol, and more specifically, when left at rest, clearly separates into an aqueous layer and an oil layer. Appearance, and when shaking lightly during use, the two layers mix easily and become an emulsion,
The present invention relates to a two-layer cosmetic which gives the skin a very good feel.

[0002]

2. Description of the Related Art As a two-layer cosmetic, a liquid-liquid system comprising an aqueous layer and an oil layer and a liquid-solid system comprising an aqueous layer and powder such as carmine (calamine) lotion are often used. Are known. It has long been proposed to mix alcohols, surfactants and the like as essential components in two-layer cosmetics in order to improve their functions. For example, sodium pyrrolidonecarboxylate, ethyl alcohol and / or propyl alcohol, a multi-layer cosmetic containing a surfactant (Japanese Patent Publication No. 52-28851), sodium lactate, ethyl alcohol and / or propyl alcohol, and a surfactant were contained. Multilayer cosmetics (JP-A-54-41335),
Multilayer type liquid cosmetics containing surfactants, oils, water-soluble salts or organic acids, lower alcohols, and water (JP-A-64-40)
413), discloses an emulsified layer (Japanese Patent Laid-Open No. 4-112811) containing an oil agent and a nonionic surfactant which are liquid at ordinary temperature, and the upper layer of which is an emulsified layer.

[0003] However, although ethanol can provide a refreshing feeling and a refreshing feeling after application, some people may feel irritation to the skin, and many consumers have anxiety. As a surfactant, sorbitan fatty acid esters,
Polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyglycerin alkylphenyl ether, polyoxyethylene oleyl alcohol ether, polyoxyethylene hydrogenated castor oil, alkyl phosphate ester salt, polyoxyethylene alkyl ether phosphate, polyoxyethylene Multilayer cosmetics using alkyl ether phosphate, polyoxyethylene glycol fatty acid ester, polyoxyethylene fatty acid glyceryl, polyoxyethylene sorbite fatty acid ester, etc. are widely known, but have a large blending amount and are sticky, There was a problem that the feeling of use was unfavorable. Also, it takes a long time to separate after shaking,
There were drawbacks that the oil layer did not become transparent after separation or an emulsion appeared at the interface between the aqueous layer and the oil layer, which was unfavorable in appearance, and was poorly evaluated as a cosmetic.

[0004] Further, some multilayer cosmetics not containing alcohol as an essential component have been disclosed, but polyglycerin alkylphenyl ether type compounds, water-soluble salts, liquid oily substances, and water (JP-A-63-27409) are disclosed. Although the transparency of the water layer and the oil layer after separation and the clarity of the interface between the water layer and the oil layer are excellent, skin irritation may occur when used externally as a cosmetic.

Further, multilayer cosmetics containing organic acid salts, polyhydric alcohols, surfactants, water and the like (JP-A-63-33317), (JP-A-63-79806),
(JP-A-63-79807), (JP-A-63-7980)
8), (JP-A-63-79811), (JP-A-63-8798)
3009), (Japanese Patent Application Laid-Open No. 63-83011), and
3-165304) and (Japanese Patent Application Laid-Open No. 63-165305), however, a multi-layered cosmetic composition having a high use ratio of a surfactant and having both safety and practicality in use has not been obtained.

[0006]

Accordingly, the present invention solves the above-mentioned problems of the conventional multi-layer cosmetics, gives the skin an excellent feel, has excellent two-layer separability, and An object of the present invention is to provide a liquid-liquid type two-layer cosmetic comprising a water layer and an oil layer which do not contain a lower alcohol such as ethanol and isopropyl alcohol.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, polyoxyethylene sorbitan fatty acid ester, and one or more specific amounts of sorbitan fatty acid ester, When the specific amount of sodium citrate and the specific amount of one or more water-soluble polymers are blended in the prescribed range, the appearance and clear separation into two layers of an aqueous layer and an oil layer when left standing. When lightly shaken at the time of use, the two layers are easily mixed and become a milky liquid, thereby obtaining a two-layer cosmetic which gives the skin a very good feel. Furthermore, it has been found that the usability is remarkably improved by adding a specific amount of copper chlorophyll, and the present invention has been completed.

[0008]

Embodiments of the present invention will be described below in detail.

[0009] The two-layer cosmetic of the present invention is a liquid-liquid type cosmetic comprising two layers of an aqueous layer and an oil layer. When left at rest before use, the aqueous layer and the oil layer are clearly separated into two layers. Appearance, refers to cosmetics that are used by shaking lightly immediately before use as an emulsion, and can be applied to cosmetics, quasi-drugs, skin cosmetics, and hair cosmetics.

As the component (A) polyoxyethylene sorbitan fatty acid ester used in the present invention, mono-coconut fatty acid POE (20) sorbitan, monopalmitic acid P
OE (20) Sorbitan, POE monostearate (20)
Sorbitan, POE monostearate (6) sorbitan, POE monooleate (20) sorbitan, POE trioleate (20) sorbitan, POE monooleate
(6) Sorbitan, POE monoisostearate (20)
Sorbitan.

The sorbitan fatty acid esters include sorbitan monolaurate, sorbitan monopalmitate,
Sorbitan monostearate, sorbitan sesquistearate, sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, sorbitan monoisostearate, and sorbitan sesquiisostearate. Polyoxethylene sorbitan fatty acid ester is particularly preferably POE (20) sorbitan trioleate, and sorbitan fatty acid ester is particularly sorbitan sesquioleate from the viewpoint of emulsifiability, usability, and two-layer separability upon standing after use. preferable.

The polyoxyethylene sorbitan fatty acid ester and the sorbitan fatty acid ester of the component (A) can be used alone or in combination of two or more, preferably 0.01 to 0.4% by weight in the total composition. More preferably, the content is 0.02 to 0.3% by weight,
If the amount is less than 1% by weight, the emulsifying power when lightly shaken during use is weak and there is a problem in useability. Conversely, if it exceeds 0.4% by weight, the oil layer is emulsified when used with shaking and allowed to stand. Or an emulsion is formed at the interface between the water layer and the oil layer, and there is a problem in appearance and stability as a two-layer cosmetic. In addition, stickiness occurs in usability.

The component (B) sodium citrate used in the present invention is preferably from 0.5 to 2.5% by weight, more preferably from 0.7 to 1.5% by weight, based on the total composition. When the blending amount is less than 0.5% by weight, the emulsion is used at the interface between the water layer and the oil layer when used with shaking and allowed to stand,
Alternatively, there is a problem that the water layer and the oil layer are emulsified. Conversely, if it exceeds 2.5% by weight, stickiness occurs in usability.

The component (C) water-soluble polymer used in the present invention includes xanthan gum and / or sodium hyaluronate. Xanthan gum uses a polysaccharide whose main chain consists of two residues of glucose, and whose side chain has a repeating structure consisting of two residues of mannose and one residue of glucuronic acid. If not, cosmetics commonly used can be blended.

[0015] Sodium hyaluronate has a molecular weight of 50,000 to 2.2 million obtained by a fermentation method or a culture method using Streptococcus zooepidemicus, a kind of lactic acid bacteria. It is well known that xanthan gum is used as a thickener and stabilizer for cosmetics and foods. In cosmetics, water-soluble vitamin C, a whitening agent, is used as a thickener and stabilizer for cosmetics. It is also well known that Also, sodium hyaluronate is well known as a humectant.

However, the composition of xanthan gum and / or sodium hyaluronate used in the present invention is as follows:
Shake and determine the emulsion stability during use. It is used to adjust the separation speed of the aqueous layer and the oil layer to enhance usability and ease of use. The amount of such xanthan gum is preferably 0.01 to 0.3% by weight, more preferably 0.05 to 0.15% by weight, based on the total composition. When the amount is less than 0.01% by weight, the separation speed of the water layer and the oil layer is too high when used with gentle shaking, and there is a problem in usability and ease of use. Conversely, if it exceeds 0.3% by weight, stickiness occurs in the usability.

The amount of sodium hyaluronate is preferably 0.005 to 0.15% by weight, more preferably 0.01 to 0.075% by weight, based on the total amount. When the amount is less than 0.005% by weight, the separation speed of the water layer and the oil layer is too high when used with gentle shaking, and there is a problem in usability and ease of use. Conversely, if it exceeds 0.15% by weight, stickiness occurs in usability.

Copper chlorophyll is an oil-soluble pigment. In the present invention, it is blended with the upper oil layer and colored in an appropriate green color, giving a contrast with the aqueous layer to show the state of two-layer separation to the consumer. It is a visual indication of the necessity that consumers must apply the product to the skin by shaking well before use in order to use the composition from the beginning to the end without breaking the balance between the water layer and the oil layer. is there. Therefore, the present invention incorporates an oil-soluble green pigment, copper chlorophyll, which is extremely stable in the oil layer.

The content of the copper chlorophyll is preferably 0.0001 to 0.02% by weight, more preferably 0.0005 to 0.01% by weight, based on the total composition, and if the content is less than 0.0001% by weight. If the color tone is weak, if it exceeds 0.02% by weight, it will not be uniformly dissolved, and unmelting or precipitation may occur.

In the two-layer cosmetic of the present invention, in addition to the essential components which have been mentioned above, components used in external skin preparations such as ordinary cosmetics, quasi-drugs, and pharmaceuticals, such as oils and fats, hydrocarbon oils, Esters, humectants, polyhydric alcohols, water-soluble salts, anti-inflammatory agents, preservatives, antioxidants, neutralizers, chelating agents, drugs, silicone oils, essential oils, pigments, flavors, purified water, etc. as required Can be appropriately blended. Specific examples of components that can be blended are listed below, but the two-layer cosmetic of the present invention can be manufactured by a conventional method by blending any one or more of these components with the above essential components. .

Examples of fats and oils include macadamia nut oil, evening primrose oil, sunflower oil, rosehip oil, perilla oil, corn oil, olive oil, sesame oil, wheat germ oil, grape seed oil, avocado oil, safflower oil, sweet almond oil, Examples include hazelnut oil, egg yolk oil, cholesteryl hydroxystearate, and cholesteryl fatty acid macadamia nut oil.

Examples of the hydrocarbon oil include liquid paraffin, olive squalane, squalane, pristane and the like.

As esters, for example, isononyl isononanoate, isotridecyl isononanoate, isocetyl octoate, isostearyl myristate, neopentyl glycol dioctanoate, neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, tri (caprylic caprin) Acids) glyceryl, trimethylolpropane triisostearate, octyldodecyl lactate, diisostearyl malate, isostearyl isostearate, isocetyl isostearate, isopropyl isostearate, octyldodecyl isostearate, octyl isopalmitate, octyl isoperargonate, 2 -Cetyl ethylhexanoate, hexyl laurate, octyldodecyl dimethyloctanoate and the like. These oily components such as fats, hydrocarbon oils and esters can be blended in the range of 1 to 50% by weight.

As the humectant, any components which are usually used as humectants in cosmetics can be used. For example, mucopolysaccharides such as hyaluronic acid, xylobiose mixture, sodium polyacrylate, trimethylglycine, Examples include sodium pyrrolidonecarboxylate, succinylcarboxymethylchitosan, and succinylchitosan.

Examples of the polyhydric alcohol include ethylene glycol, polyethylene glycol, propylene glycol, 1,3-butylene glycol, dipropylene glycol, glycerin, diglycerin, polyglycerin, glycose, maltose, maltose, xylitol, sorbitol, erythritol, 3-methyl-
1,3-butanediol and the like.

As the water-soluble salts, inorganic salts and organic acid salts can be used. For example, sodium chloride, potassium chloride, sodium sulfate, magnesium sulfate, sodium carbonate, calcium carbonate, sodium sulfite, sodium lactate, sodium hydrogen phosphate , Disodium hydrogen phosphate,
Citric acid, malic acid, succinic acid, tartaric acid and the like.

As the anti-inflammatory agent, any components which are usually used as an anti-inflammatory agent in cosmetics can be used. For example, comfrey extract, linden extract, button extract, gentian extract, saxifrage extract, bisabolol , Maronier extract, glycyrrhizinates, allantoin and the like.

Preservatives such as paraben, 1,2 pentanediol, phenoxyethanol, and photosensitizer 201; antioxidants such as natural vitamin E and tocophenol; neutralizing agents such as citric acid, arginine and aminomethylpropanediol;
Hidorokishietanjihosuhon tetrasodium, chelating agents such as edetic acid salts, vitamin A and derivatives, vitamin B ₆ hydrochloride, vitamin B ₂ and its derivatives, vitamin B
₁₂ , vitamin B such as vitamin B ₁₅ and its derivatives, vitamin C such as ascorbic acid phosphate (salt),
Vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, vitamin D, vitamin H, pantothenic acid, vitamin such as pantothenic acid, placenta extract, ceramide, bioceramide, bifidobacterium extract, etc. Drugs, silicone oils such as methylphenylpolysiloxane, lavender oil,
Essential oils such as Roman chamomile oil, and pigments such as gardenia blue and sodium copper chlorophyllin are also included.

The two-layer cosmetic of the present invention is, for example, a cosmetic,
In the field of quasi-drugs, it is used as skin cosmetics, hair cosmetics and the like.

[0030]

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In addition, the compounding amount is weight%. A two-layer cosmetic is prepared according to the formulas in Tables 1 to 3 by a conventional method, and the water layer and the oil layer separated from the two layers are emulsified, easily used, and allowed to stand when lightly shaken. Then, the separation speed, the two-layer separation property, and the feeling upon use were evaluated. The obtained results are also shown in “Table 1” to “Table 3”.

The emulsifying properties and ease of use during shaking, the separation speed and the two-layer separability when allowed to stand, the method of evaluating the feeling of use, and the evaluation criteria are as follows.

[Emulsification and Ease of Use During Shaking] The emulsification and ease of use during shaking were evaluated by panelists (10 persons) based on the following evaluation criteria. ８ Eight or more of the ten respondents answered that the emulsifiability was good and easy to use. ○ Six or more of the ten respondents answered that the emulsifiability was good and easy to use. B: Four or more out of 10 answered that the emulsifiability was good and easy to use. × Less than 4 out of 10 answered that the emulsifiability was good and easy to use.

[Feeling of use] The feeling of use was evaluated by panelists (10 persons) based on the following evaluation criteria. "Stickiness" ◎ More than 8 out of 10 responded that they were not sticky. ○ Six or more respondents answered that they were not sticky. △ At least 4 out of 10 responded that they were not sticky. × Less than 4 out of 10 responded that they were not sticky. “Skin discomfort” ◎ More than 8 out of 10 responded that there was no discomfort. ○ More than 6 out of 10 responded that there was no discomfort. △ At least 4 out of 10 responded that there was no discomfort. × Less than 4 out of 10 respondents did not feel uncomfortable.

[Confirmation of separation state after standing and two-layer separation property] Two-layer separation property was evaluated by panelists (10 persons) based on the following evaluation criteria. ◎ Eight or more of the ten respondents answered that they were cleanly separated. ○ More than 6 out of 10 respondents answered that they were cleanly separated. △ 4 or more of 10 respondents answered that they were cleanly separated. × Less than 4 out of 10 responded that they separated cleanly.

Examples 1 to 3 and Comparative Examples 1 to 3 Essences Essences having the composition shown in Table 1 were prepared, and emulsifying properties upon shaking, ease of use, feeling of use,
The degree of confirmation of the separation state after standing and the two-layer separation property were evaluated. The obtained results are also shown in Table 1.

[0036]

[Table 1]

[Preparation Method] The aqueous phase and the oil phase were previously homogeneously mixed, and the oil phase was added to the aqueous phase and mixed homogeneously to prepare a serum.

As is clear from Table 1, the cosmetic serum of the present invention is more emulsifying and easier to use when shaking than that of Comparative Examples 1 to 3, the feeling of use, and the two layers after standing. Good results were obtained in the separability, and an excellent serum was obtained. Table 1
As is clear from the above, when 0.0001 to 0.02% by weight of copper chlorophyll is blended, the separated state is easily confirmed and it is easy to use.

Example 4 and Comparative Examples 4 to 8 Body lotions Body lotions having the compositions shown in Table 2 were prepared, and emulsifying properties upon shaking, ease of use, feeling of use, and after standing by the above evaluation method and judgment method. Was evaluated for the degree of confirmation of the separation state and the two-layer separation property. The obtained results are also shown in Table 2.

[0040]

[Table 2]

[Production Method] A water lotion and an oil phase were previously mixed homogeneously, and the oil phase was added to the phase layer and mixed homogeneously to prepare a body lotion.

As is clear from Table 2, if the amount of sodium citrate is less than 0.5% by weight, the two-layer separation property after standing is insufficient, and if it is more than 2.5% by weight, the skin becomes sticky. There is a sense of incongruity and the usability is poor. When the amount of sorbitan sesquioleate or POE (20) sorbitan trioleate is less than 0.01% by weight, the emulsifying power at the time of shaking is weak and the usability is poor. Poor two-layer separation.

Examples 5 to 6 and Comparative Examples 9 to 10 Hair restorer A hair restorer having the composition shown in Table 3 was prepared, and emulsifiability during shaking, ease of use, feeling of use,
The degree of confirmation of the separation state after standing and the two-layer separation property were evaluated. The results obtained are also shown in Table 3.

[0044]

[Table 3]

[Production Method] Each of the aqueous phase and the oil phase was previously homogeneously mixed, and the oil phase was added to the aqueous phase and mixed homogeneously to prepare a hair restorer.

As is clear from Table 3, when the amount of xanthan gum is less than 0.01% by weight, the separation speed is high and the ease of use is inferior.
There is a sense of discomfort.

[0047]

As described in detail above, the two-layer cosmetic of the present invention is a two-layer liquid cosmetic exhibiting excellent re-emulsifiability before use and excellent two-layer separability after use. The material gives an excellent feeling of use.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Toshiharu Mori 65-1 Irino, Okabe-cho, Shita-gun, Shizuoka Prefecture F-term in Okabe Plant, Nikko Pharmaceutical Co., Ltd. AC932 AD152 AD332 AD352 BB36 CC01 CC05 CC23 CC37 DD05 EE06 EE07

Claims (2)

[Claims] 1. A composition comprising (A) one or more polyoxyethylene sorbitan fatty acid esters and sorbitan fatty acid esters, (B) sodium citrate, and (C) one or more water-soluble polymers. A two-layer cosmetic. 2. The two-layer cosmetic according to claim 1, further comprising copper chlorophyll.