JP3492952B2 - Liquid-liquid two-layer cosmetic consisting of water layer and oil layer - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a two-layer cosmetic containing no lower alcohol such as ethanol or isopropyl alcohol, and more specifically, it is clearly separated into two layers, an aqueous layer and an oil layer, when left standing. The appearance, and when shaken lightly during use, the two layers easily mix and become an emulsion,
The present invention relates to a two-layer type cosmetic which gives a very good feel to the skin.

[0002]

2. Description of the Related Art Two-layer cosmetics are preferably liquid-liquid type composed of water layer-oil layer and liquid-solid type composed of water layer-powder such as carmine (calamine) lotion. Are known. In order to improve the function of the two-layer type cosmetics, it has been proposed for a long time to incorporate alcohol, a surfactant and the like as essential components. For example, sodium pyrrolidonecarboxylate, ethyl alcohol and / or propyl alcohol, a multi-layered cosmetic containing a surfactant (Japanese Patent Publication No. 52-28551), sodium lactate, ethyl alcohol and / or propyl alcohol, and a surfactant were contained. Multi-layer cosmetics (JP-A-54-41335),
A multi-layered liquid cosmetic containing a surfactant, an oil, a water-soluble salt or an organic acid, a lower alcohol, and water (JP-A-64-40).
413), an oil layer and a nonionic surfactant which are liquid at room temperature are contained, and an upper layer is an emulsion layer (JP-A-60-78907).

However, although ethanol gives a refreshing feeling and a refreshing feeling after application, some people may feel irritation on the skin, and many consumers are anxious. As a surfactant, conventionally, sorbitan fatty acid ester,
Polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyglycerin alkyl phenyl 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 amount of compounding and are sticky, There was a problem in that it was unpleasant to use. Also, it takes a long time to separate after shaking,
The oil layer was not transparent after the separation, and an emulsion appeared at the interface between the water layer and the oil layer, which was disadvantageous in terms of appearance. Therefore, the evaluation as a cosmetic was low.

Further, some multilayer cosmetics which do not contain 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 mentioned. 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, they may cause skin irritation when used externally as a cosmetic.

Further, as a multi-layer cosmetic containing an organic acid salt, a polyhydric alcohol, a surfactant, 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-63-8)
3009), (JP-A-63-83011), (JP-A-6-63011)
No. 3-165304), (Japanese Patent Laid-Open No. 63-165305), but a high percentage of surfactant is used, and a multi-layered cosmetic having both safety and practical use has not been obtained.

[0006]

Therefore, in the present invention, the problems of the conventional multi-layered cosmetics as described above are solved, the skin feels excellent, the two-layer separability is excellent, and An object of the present invention is to provide a liquid-liquid type two-layer cosmetic comprising an aqueous layer and an oil layer that do not contain a lower alcohol such as ethanol and isopropyl alcohol.

[0007]

Means for Solving the Problems As a result of intensive studies for solving the above problems, the present inventors have found that (A) polyoxyethylene sorbitan fatty acid ester and one or more sorbitan fatty acid ester .01-0.4
% By weight, (B) sodium citrate 0.5 to 2.5% by weight, and (C) xanthan gum 0.01 to 0.3% by weight
And / or sodium hyaluronate 0.005-0.1
When 5% by weight is blended, the appearance of clear separation into two layers, an aqueous layer and an oil layer when left standing, and a slight shake during use, the two layers mix easily and become an emulsion, which results in skin. A two-layer cosmetic which gives a very good feel to the skin was obtained. Furthermore, it was found that the usability was remarkably improved by adding 0.0001 to 0.02% by weight of copper chlorophyll, and the present invention was completed.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.

The two-layer type cosmetic composition of the present invention is a liquid-liquid type cosmetic composition comprising two layers of a water layer and an oil layer, and the two layers of the water layer and the oil layer are clearly separated when standing before use. In terms of appearance, it refers to a cosmetic that is used as a milky liquid by shaking briefly before use, and can be applied to skin cosmetics and hair cosmetics such as cosmetics and quasi-drugs.

The component (A) polyoxyethylene sorbitan fatty acid ester used in the present invention includes monococonut oil fatty acid POE (20) sorbitan and monopalmitic acid P.
OE (20) sorbitan, POE (20) monostearate
Sorbitan, POE (6) sorbitan monostearate, POE (20) sorbitan monooleate, POE (20) sorbitan trioleate, POE monooleate
(6) Sorbitan, POE (20) monoisostearate
Examples include sorbitan.

As the sorbitan fatty acid ester, sorbitan monolaurate, sorbitan monopalmitate,
Examples include sorbitan monostearate, sorbitan sesquistearate, sorbitan tristearate, sorbitan monooleate, sorbitan trioleate, sorbitan monoisostearate, sorbitan sesquiisostearate, and water and oil layers when shaking before use. The polyoxyethylene sorbitan fatty acid ester is particularly preferably POE (20) sorbitan trioleate, and the sorbitan fatty acid ester is particularly sorbitan sesquioleate, because of its emulsifying property, usability, and separability after two-layer standing. preferable.

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

The component (B) sodium citrate used in the present invention is preferably 0.5 to 2.5% by weight, more preferably 0.7 to 1.5% by weight, based on the total composition. If the blending amount is less than 0.5% by weight, an emulsion is generated at the interface between the water layer and the oil layer when used by shaking and standing,
Alternatively, there is a problem that the water layer and the oil layer are emulsified. On the other hand, if it exceeds 2.5% by weight, stickiness will occur in usability.

Xanthan gum uses a polysaccharide having a main chain of two glucose residues and a side chain of a repeating structure having mannose of two residues and one residue of glucuronic acid as a constitutional unit. If the structures are not different, those generally used in cosmetics can be blended.

Sodium hyaluronate has a molecular weight of 50,000 to 2,200,000 obtained by a fermentation method or a culture method using Streptococcus zooepidemicus, which is a kind of lactic acid bacterium. It is well known that xanthan gum is used as a thickening and stabilizing agent for cosmetics and foods. In cosmetics, it is also used as a thickening agent and stabilizer for cosmetics containing water-soluble vitamin C, which is a whitening agent. It is also well known. Also, sodium hyaluronate is well known as a moisturizer.

However, the compounding of xanthan gum and / or sodium hyaluronate used in the present invention is as follows.
It determines the emulsion stability during shaking and use, and is used to enhance usability and usability by adjusting the separation speed of the water layer and oil layer. The content 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. If the blending amount is less than 0.01% by weight, the speed of separation between the water layer and the oil layer is too fast when used by lightly shaking, and there is a problem in usability and ease of use. On the contrary, if it exceeds 0.3% by weight, stickiness is caused in usability.

The content 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. If the blending amount is less than 0.005% by weight, the speed of separation between the water layer and the oil layer is too fast when used by shaking gently, which causes problems in usability and usability. On the other hand, if it exceeds 0.15% by weight, stickiness will occur in usability.

Copper chlorophyll is an oil-soluble dye, and in the present invention, it is blended in the upper oil layer to give an appropriate green color, and is contrasted with the aqueous layer to show the state of two-layer separation to the consumer. It is a visual indication of the need for consumers to shake the skin well before applying it to the skin in order to use it without disturbing the mixing balance of the water layer and oil layer from the beginning to the end. is there. Therefore, the present invention incorporates copper chlorophyll, which is an oil-soluble green pigment that is extremely stable in the oil layer.

The content of the copper chlorophyll in the entire composition is preferably 0.0001 to 0.02% by weight, more preferably 0.0005 to 0.01% by weight, and if the content is less than 0.0001% by weight. The color tone is weak, and if it exceeds 0.02% by weight, it may not be uniformly dissolved, and may remain undissolved or precipitate.

In addition to the above-mentioned essential constituents, the two-layer type cosmetic of the present invention is a component used for a general external preparation for skin such as cosmetics, quasi drugs and pharmaceuticals, such as oils and fats, hydrocarbon oils and esters. , Moisturizers, polyhydric alcohols, water-soluble salts, anti-inflammatory agents, preservatives, antioxidants, neutralizing agents, chelating agents, drugs, silicone oils, essential oils, pigments, fragrances, purified water, etc. It can be blended appropriately. Specific examples of the components that can be blended are listed below, but the two-layer cosmetic of the present invention can be produced by a conventional method by blending any one or more of these components with the above essential components. .

Examples of fats and oils are macadamia nut oil, evening primrose oil, sunflower oil, rosehip oil, sesame oil, corn oil, olive oil, sesame oil, wheat germ oil, grape seed oil, avocado oil, safflower oil, sweet almond oil, Hazelnut oil, egg yolk oil, cholesteryl hydroxystearate, macadamia nut oil fatty acid cholesteryl and the like can be mentioned.

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

Examples of the esters include isononyl isononanoate, isotridecyl isononanoate, isocetyl octanoate, isostearyl myristate, neopentyl glycol dioctanoate, neopentyl glycol dicaprate, glyceryl tri-2-ethylhexanoate, tri (capryl-caprin). Acid) glyceryl, trimethylolpropane triisostearate, octyldodecyl lactate, diisostearyl malate, isostearyl isostearate, isocetyl isostearate, isopropyl isostearate, octyldodecyl isostearate, octyl isopalmitate, octyl isoperargonate, 2 Examples include cetyl ethylhexanoate, hexyl laurate, octyldodecyl dimethyloctanoate, and the like. The oily components such as oils and fats, hydrocarbon oils and esters can be blended in the range of 1 to 50% by weight.

As the moisturizer, any of the components usually used as moisturizers in cosmetics can be used. For example, mucopolysaccharides such as hyaluronic acid, xylobiose mixture, sodium polyacrylate, trimethylglycine, Examples thereof include sodium pyrrolidonecarboxylate, succinylcarboxymethyl chitosan, succinyl chitosan and the like.

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

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,
Examples thereof include citric acid, malic acid, succinic acid and tartaric acid.

As the anti-inflammatory agent, any of the components usually used as an anti-inflammatory agent in cosmetics can be used. For example, comfrey extract, linden extract, button extract, gentian extract, yukinoshita extract, bisabolol. , Horse chestnut extract, glycyrrhizinates, allantoin and the like.

Parabens, 1,2-pentanediol, phenoxyethanol, preservatives such as Photosensitizer No. 201, antioxidants such as natural vitamin E and tocophenol, neutralizing agents such as citric acid, arginine and aminomethylpropanediol,
Tetrasodium hydroxyethanediphosphonate, chelating agents such as edetates, vitamin A and derivatives, vitamin B ₆ hydrochloride, vitamin B ₂ and its derivatives, vitamin B
Vitamin Bs such as ₁₂ , vitamin B ₁₅ and its derivatives, vitamin Cs such as ascorbic acid phosphate (salt),
Vitamin Es such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, vitamins D, vitamin H, pantothenic acid, vitamins such as pantothenic acid, placenta extract, ceramide, bioceramide, bifidobacteria extract, etc. Drug, silicone oil such as methylphenylpolysiloxane, lavender oil,
Examples thereof include essential oils such as Roman chamomile oil, and gardenia blue, pigments such as sodium copper chlorophyllin, and the like.

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

[0030]

EXAMPLES Next, examples and comparative examples of the present invention will be described in more detail, but the present invention is not limited thereto. The blending amount is% by weight. According to the formulations of "Table 1" to "Table 3", a two-layer type cosmetic composition was prepared by a conventional method, and the water layer and the oil layer separated from each other were emulsified and easy to use, and allowed to stand still. The separation speed, the two-layer separation property, and the feeling during use were evaluated. The obtained results are also shown in "Table 1" to "Table 3". In addition, in the comparative example, any one of (A) polyoxyethylene sorbitan fatty acid ester and one or more sorbitan fatty acid ester, (B) sodium citrate, (C) xanthan gum and / or sodium hyaluronate contained therein is used. An example when the amount is outside the range defined in the present invention is shown.

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

[Emulsifying property during shaking and ease of use] Emulsifying property during shaking and ease of use were evaluated by panelists (10 persons) based on the following evaluation criteria. ◎ Eight or more out of 10 answered that the emulsifying property was good and easy to use. ○ 6 or more out of 10 answered that the emulsifying property was good and easy to use. Δ 4 or more out of 10 answered that the emulsifying property was good and easy to use. × Less than 4 out of 10 answered that the emulsifying property was good and easy to use.

[Usage] 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. ○ 6 out of 10 people answered that they were not sticky. △ 4 out of 10 people answered that they were not sticky. × Less than 4 out of 10 responded that they were not sticky. "Skin discomfort" ◎ 8 out of 10 people answered that they did not have any discomfort. ○ More than 6 out of 10 responded that there was no discomfort. △ 4 out of 10 people answered that there was no discomfort. × Less than 4 out of 10 responded that there was no discomfort.

[Confirmation of Separation State after Standing and Two-Layer Separability] The panel (10 persons) evaluated the two-layer separability based on the following evaluation criteria. ◎ More than 8 out of 10 respondents answered that they were cleanly separated. ○ More than 6 out of 10 replied that they were separated cleanly. △ 4 or more out of 10 people answered that they were cleanly separated. × Less than 4 out of 10 people answered that they were cleanly separated.

Examples 1 to 3 and Comparative Examples 1 to 2 Beauty essence A beauty essence having the composition shown in Table 1 was prepared, and the emulsification property at the time of shaking, ease of use, and feeling of use were evaluated by the above evaluation method and determination method.
The degree of confirmation of the separated state after standing and the two-layer separability were evaluated. The obtained results are also shown in Table 1.

[0036]

[Table 1]

[Manufacturing Method] A water phase and an oil phase were preliminarily mixed homogeneously, and the oil phase was added to the water phase and mixed homogeneously to prepare a beauty essence.

As is clear from Table 1, the beauty essence of the present invention was compared with those of Comparative Examples 1 and 2 in that the emulsifiability and ease of use during shaking, the feeling of use, and the two-layer after standing. A good result was obtained in terms of separability, and an excellent serum was obtained. Also, 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 easy to confirm and easy to use.

Example 4 and Comparative Examples 3 to 6 Body lotion A body lotion having the composition shown in Table 2 was prepared, and the emulsification property and ease of use during shaking, the feeling of use, and the standing time were determined by the above evaluation methods and determination methods. The degree of confirmation of the separated state and the two-layer separability were evaluated. The obtained results are also shown in Table 2.

[0040]

[Table 2]

[Manufacturing Method] Each of the water phase and the oil phase was previously homogeneously mixed, and the oil phase was added to the water phase and homogeneously mixed to prepare a body lotion.

As is clear from Table 2, if the content of sodium citrate is less than 0.5% by weight, the two-layer separation property after standing is insufficient, and if it exceeds 2.5% by weight, the skin becomes sticky. , There is a feeling of strangeness and the usability is poor.

Examples 5 to 6 and Comparative Examples 7 to 8 Hair nourishing agents Hair nourishing agents having the compositions shown in Table 3 were prepared, and the emulsifying properties at the time of shaking, ease of use, and feeling of use were evaluated by the above evaluation methods and determination methods.
The degree of confirmation of the separated state after standing and the two-layer separability were evaluated. The obtained results are also shown in Table 3.

[0044]

[Table 3]

[Manufacturing Method] The aqueous phase and the oil phase were preliminarily mixed homogeneously, and the oil phase was added to the aqueous phase and mixed homogeneously to prepare a hair nourishing agent.

As is clear from Table 3, when the content of xanthan gum is less than 0.01% by weight, the separation speed is high and the ease of use is poor, and when it exceeds 0.3% by weight, stickiness and discomfort are felt.

[0047]

As described above in detail, the two-layer type cosmetic composition of the present invention is a two-layer type liquid cosmetic having a clean appearance which is excellent in re-emulsification property before use and two-layer separation property after use. The product gives an excellent feeling in use.

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-2-167212 (JP, A) JP-A-10-316539 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61K 7/00-7/50

Claims (2)

(57) [Claims] 1. A polyoxyethylene sorbitan fatty acid ester (A) and 0.01 to 0.4% by weight of one or more sorbitan fatty acid esters, and (B) sodium citrate 0.5 to 2.5. (C) xanthan gum (0.01-0.3% by weight) and / or sodium hyaluronate (0.005-0.15% by weight). Two-layer type cosmetics. 2. Copper chlorophyll 0.0001-
The liquid-liquid two-layer type cosmetic composition comprising an aqueous layer-oil layer according to claim 1, containing 0.02% by weight.