JP6821487B2 - Two-layer hair cosmetics - Google Patents

Description

The present invention relates to a two-layer hair cosmetic containing an aqueous layer and an oil layer.

Hair is damaged by the effects of ultraviolet rays, blows, brushing, hair washing, coloring, etc., causing symptoms such as dryness, firmness and elasticity, loss of luster, and deterioration of finger passage and cohesion. Conventionally, hair cosmetics that do not wash off have been put on the market for the purpose of improving these symptoms.

Hair cosmetics that do not wash off are generally those that improve the above-mentioned symptoms by forming an oil film on the hair with an oil agent such as silicone. In particular, it is known that hair cosmetics containing highly polymerized dimethicone are easy to spread evenly and are excellent in improving finger passage, cohesion, gloss and the like. Further, it is known that a higher improvement effect can be obtained by adding a high amount of highly polymerized dimethicone.

The dosage forms of hair cosmetics that do not wash off include an oil type that contains almost no water, an emulsified type that contains water or a surfactant in the oil, an oil layer that contains the oil, and an aqueous layer that contains water or a surfactant. There is a two-layer type including two layers of and. The oil type is excellent in that it can contain a high amount of oil. However, there are problems such as stickiness during use, poor growth, and difficulty in spreading over the entire hair. As an emulsified type, an oil-in-water emulsion is generally used in order to improve stickiness and elongation during use. However, since it is necessary to add a large amount of surfactant in order to add a large amount of the oil agent in the internal phase of the emulsion, there is a problem that stickiness due to the surfactant occurs.

A two-layer type has been proposed as a dosage form that can solve the problems of emulsification type and oil type. For two-layer type hair cosmetics, shake the product well before use to emulsify the oil layer and water layer, then take it out before the start of separation between the oil layer and water layer, stretch it well with the palm of your hand, and then hair. It is generally used by applying to. Therefore, it is important to adjust the emulsifying power between the oil layer and the water layer. For example, Patent Document 1 discloses a non-rinse type hair cosmetic containing two layers, an oil layer containing a high concentration of highly polymerized dimethicone and an aqueous layer containing a water-soluble polymer thickener.

JP-A-2009-161508

The hair cosmetics described in Patent Document 1 adjust the emulsifying power between the oil layer and the aqueous layer by blending a water-soluble polymer thickener, water, a specific surfactant and an organic solvent in the aqueous layer. However, there is concern about damage to the scalp and hair caused by organic solvents. Furthermore, it is not disclosed that lauryltrimonium chloride and N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate are blended as cationic surfactants.

The present invention is a two-layer hair cosmetic that easily emulsifies the oil layer and the water layer during use and quickly separates the oil layer and the water layer after use, even though it contains a sufficient amount of the oil layer. An object of the present invention is to provide a two-layer hair cosmetic that is not sticky at the time of use and has excellent applicability to the entire hair.

That is, the present invention
(1) A two-layer hair cosmetic consisting of an oil layer containing the following component A and an aqueous layer containing the following component B, the following component C, the following component D and the following component E.
The oil layer content (oil layer / water layer, mass ratio) with respect to the water layer content is 20/80 or more.
Two-layer hair cosmetics in which the content of component B in the aqueous layer is 20 to 32% by mass Component A: Dimethicone and / or dimethiconol having a kinematic viscosity of 100,000 mm ² / s or more at 25 ° C. Component B: Carbon Lower alcohols of number 2-5 Component C: Lauryltrimonium chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate Component D: Water-soluble polymer thickener Component E: Water ( 2) The two-layer hair cosmetic according to (1) above, wherein the content of the component C is 0.01 to 0.30% by mass.

Although the two-layer hair cosmetic of the present invention contains a sufficient oil layer, it is easy to emulsify the oil layer and the water layer during use, and the oil layer and the water layer are quickly separated after use. , Easy to use and excellent in aesthetics. Further, the two-layer hair cosmetic of the present invention is not sticky at the time of use and is excellent in applicability to the entire hair.

The two-layer hair cosmetic of the present invention has an oil layer containing dimethicone and / or dimethiconol having a kinematic viscosity of 100,000 mm ² / s or more at 25 ° C., and a lower alcohol having 2 to 5 carbon atoms, lauryltrimonium. Includes an aqueous layer containing chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate, water-soluble polymer thickeners and water.

In the present specification, the dimethicone and / or dimethiconol may be referred to as "component A". Further, the lower alcohol having 2 to 5 carbon atoms may be referred to as "component B". In addition, the lauryltrimonium chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate may be referred to as "component C". In addition, the water-soluble polymer thickener may be referred to as "component D". In addition, the water may be referred to as "component E".

The two-layer hair cosmetic of the present invention may further contain components (other components) other than the above-mentioned components A to E. As the above-mentioned components, for example, components A to E and other components, only one kind may be used, or two or more kinds may be used.

Oil layer The oil layer contains dimethicone and / or dimethiconol (component A) having a specific kinematic viscosity.

The component A is dimethicone and / or dimethiconol having a kinematic viscosity of 100,000 mm ² / s or more at 25 ° C. The kinematic viscosity of component A at 25 ° C. is from the viewpoint of good finish (lightness of finger passage, gloss, good cohesion, softness of hair at finish) after using the two-layer hair cosmetic of the present invention. From 100,000 mm ² / s or more, preferably 5 million mm ² / s or more, and more preferably 10 million mm ² / s or more. The upper limit of the kinematic viscosity of component A at 25 ° C. is not particularly limited, but is preferably 30 million or less.

As the component A, a commercially available product can be used. Commercially available products of component A include, for example, XF49-811 (trade name, manufactured by Momentive Performance Materials), DOWN CORNING TORAY BY 11-026 (trade name, manufactured by Toray Dow Corning Co., Ltd.), PMX- Examples include 1501 Fluid (trade name, manufactured by Toray Dow Corning Co., Ltd.).

The content of component A in the two-layer hair cosmetic is 0.5% by mass or more from the viewpoint of improving the effect of improving finger passage, cohesion, gloss, etc., and the softness of the hair at the time of finishing. Is preferable, more preferably 0.8% by mass or more, and further preferably 1.0% by mass or more. The content of the component A is preferably 10.0% by mass or less, more preferably 7.0% by mass or less, still more preferably 7.0% by mass or less, from the viewpoint of lightness of the hair at the time of finishing and applicability to the hair. Is 5.0% by mass or less.

The oil layer preferably contains volatile oil. In addition to the role of the volatile oil as a solubilizer for the component A, the volatile oil improves the coatability and volatilizes after the coating, so that the effect of the remaining component A can be further exerted.

Examples of the volatile oil include hydrocarbon oils that are volatile under standard atmospheric pressure, silicone oils that are volatile under standard atmospheric pressure, and the like. As the volatile oil, only one kind may be used, or two or more kinds may be used. In addition, in this specification, having volatility under standard atmospheric pressure means that the boiling point at standard atmospheric pressure is 300 ° C. or less.

Examples of the hydrocarbon oil having volatility under standard atmospheric pressure include isoparaffin, light isoparaffin, light liquid isoparaffin, hydrogenated polyisobutene and the like.

Examples of the silicone oil having volatility under the standard atmospheric pressure include cyclic silicone and chain silicone. Examples of the cyclic silicone include octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane (cyclopentasiloxane), and dodecamethylcyclohexasiloxane. Examples of the chain silicone include octamethyltrisiloxane, tetradecamethylhexasiloxane, and dimethicone having volatility under standard atmospheric pressure.

Among the volatile oils, hydrogenated polyisobutene and cyclopentasiloxane are preferable. In particular, hydrogenated polyisobutene having a low density because it contains a large amount of component B and the separation rate between the oil layer and the water layer can be easily adjusted even when the density of the water layer (mass per unit volume) is low. Is more preferable.

When the volatile oil is contained, the content in the two-layer hair cosmetic is preferably 8.0% by mass or more, more preferably 10. By mass% or more, from the viewpoint of the solubility of the component A and the applicability to the hair. It is 0% by mass or more, more preferably 13.0% by mass or more. The content of the volatile oil is preferably 50.0% by mass or less, more preferably 45.0% by mass or less, still more preferably 40.0% by mass, from the viewpoint of reducing the dryness of the hair after application. % Or less.

It is preferable that the oil layer contains a component (other component) other than the component A and the volatile oil from the viewpoint of usability. Other components include oils that are liquid at room temperature (oils other than the volatile oils and may be referred to hereinafter as non-volatile oils), oils that are solid at room temperature such as vaseline and shea butter, and antioxidants such as tocopherols. Examples thereof include agents, ultraviolet absorbers such as 2-ethylhexyl paramethoxysilicate, oil-soluble dyes such as red 215, red 223, orange 201, and orange 205, and various fragrances. In this specification, room temperature represents a temperature range of 1 to 30 ° C.

Examples of the oil agent liquid at room temperature include liquid hydrocarbon oils, liquid ester oils, liquid silicone oils, liquid fats and oils, liquid waxes, and liquid fatty acids.

Specific examples of the liquid hydrocarbon oil include α-olefin oligomer, liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, and liquid paraffin.

Specific liquid ester oils include, for example, isostearyl isostearate, isopropyl isostearate, isodecyl isononanoate, isononyl isononanoate, octyl isononanoate, cetyl ethylcaproate, cetyl octanoate, oleyl oleate, and propylene glycol diisostearate. , Neopentylene glycol diethylcaproate, neopentyl glycol dicaproate, pentaerythrityl tetraoctanoate, trimethylolpropane triisostearate, erythrityl triethylhexanoate, trioctanoin, tri (caprylic acid / capric acid) glyceryl, palmitic acid Examples thereof include isopropyl, ethylhexyl palmitate, jojoba ester, isostearyl myristate, isopropyl myristate, octyldodecyl myristate, and diisostearyl malate.

Specific liquid silicone oils include, for example, chain silicones such as methylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and dimethiconol other than the component A and the volatile oil, methylcyclopolysiloxane, and octa. Cyclic silicones such as methylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, aminopropylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane -Amino-modified silicones such as dimethylsiloxane copolymers, carboxy-modified silicones, fatty acid-modified silicones, alcohol-modified silicones, aliphatic alcohol-modified silicones, epoxy-modified silicones, fluorine-modified silicones, and modified silicones such as alkyl-modified silicones can be mentioned.

Specific examples of liquid fats and oils, waxes and fatty acids include avocado oil, argan oil, almond oil, olive oil, rice bran oil, macadamia nut oil, jojoba oil, isostearic acid and oleic acid.

When other components are contained, the content in the two-layer hair cosmetic is not particularly limited as long as the effect of the present invention is not impaired, but is preferably 0.1 to 40.0% by mass, more preferably 0. .5 to 20.0% by mass, more preferably 1.0 to 10.0. When the content of other components exceeds 40.0% by mass, it tends to be sticky.

Aqueous layer The aqueous layer is composed of a lower alcohol having 2 to 5 carbon atoms (component B), lauryltrimonium chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate (component C). It contains a water-soluble polymer thickener (component D) and water (component E).

The component B is a lower alcohol having 2 to 5 carbon atoms. By containing a lower alcohol having 2 to 5 carbon atoms, the separation rate into two layers after emulsification can be adjusted. In addition, hair growth is improved.

Examples of the lower alcohol having 2 to 5 carbon atoms include ethanol, propyl alcohol, isopropanol and the like, and ethanol and isopropanol are preferable.

The content of the component B in the aqueous layer is 20% by mass or more, preferably 22% by mass or more, and more preferably 24% by mass or more. When the content of the component B in the aqueous layer is less than 20% by mass, the cosmetic is foamed and tends to be inferior in usability and aesthetics. The content of the component B in the aqueous layer is 32% by mass or less, preferably 30% by mass or less, and more preferably 28% by mass or less. When the content of the component B in the aqueous layer exceeds 32% by mass, the density of the aqueous layer may decrease and it may be difficult to separate from the oil layer, and the alcohol odor may be strong and unpleasant.

The content of the component B in the two-layer hair cosmetic is preferably 6.0% by mass or more, more preferably 8.0, from the viewpoint of the separation rate into the two layers after emulsification and the elongation on the hair. It is mass% or more. The content of the component B in the two-layer hair cosmetic is preferably 25.6% by mass or less, more preferably 22.5% by mass or less, from the viewpoint of suppressing alcohol odor and usability.

The component C is lauryltrimonium chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate. The component C is contained for the purpose of adjusting the ease of emulsification between the oil layer and the aqueous layer and the separation rate into the two layers.

Commercially available products can be used as the lauryltrimonium chloride and / or the N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate. Examples of commercially available products of lauryltrimonium chloride include Kotamin 24P (trade name, manufactured by Kao Corporation) and NIKKOL CA-2150 (trade name, manufactured by Nikko Chemicals Co., Ltd.). Examples of the N-coconut oil fatty acid acyl-L-arginine ethyl / DL-pyrrolidone carboxylate include CAE (trade name, manufactured by Ajinomoto Co., Inc.).

The content of component C in the two-layer hair cosmetic is preferably 0.01% by mass or more from the viewpoint of ease of emulsification between the oil layer and the aqueous layer, the separation rate into the two layers, and the antiseptic effect. It is more preferably 0.02% by mass or more, and further preferably 0.03% by mass or more. From the viewpoint of safety, the content of the component C is preferably 0.30 or less, more preferably 0.25% by mass or less, still more preferably 0.22% by mass or less, and most preferably 0. It is .18% by mass or less.

The component D is a water-soluble polymer thickener. The water-soluble polymer is contained for the purpose of improving the usability by imparting an appropriate viscosity to the emulsified cosmetic and adjusting the separation rate into two layers after emulsification. Examples of the water-soluble polymer thickener include natural polymers such as xanthan gum and carrageenan, semi-synthetic polymers such as hydroxyethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose and hydroxypropyl guagam, and synthetic polymers such as carboxyvinyl polymer. .. Of these, hydroxypropyl methylcellulose is preferable because it is excellent in usability.

The content of component D in the two-layer hair cosmetic is 0.02% by mass from the viewpoint of whether or not the hair is separated into two layers after emulsification and from the viewpoint of imparting appropriate viscosity to improve the usability. The above is preferable, more preferably 0.05% by mass or more, still more preferably 0.10% by mass or more. When the content of the component D is less than the above lower limit, the oil layer and the aqueous layer can be emulsified by shaking, but the emulsified particles become too fine due to insufficient viscosity of the cosmetic, and coalescence is unlikely to occur and separation occurs. It tends to be difficult to do. The content of the component D is preferably 0.8% by mass or less, more preferably 0.6% by mass or less, still more preferably 0.%, from the viewpoint of stickiness during use and the separation rate into two layers. It is 5% by mass or less. When the content of the component D exceeds the above upper limit, the viscosity of the cosmetic is too high, the movement of the emulsified particles is slowed down, coalescence is unlikely to occur, and separation tends to be difficult.

The water of the component E is not particularly limited as long as it can be used as a raw material for cosmetics, but purified water is usually used. The content of the component E in the two-layer hair cosmetic is preferably 25.0 to 70.0% by mass, more preferably 27.0 to 68, from the viewpoint of the solubility of the component blended in the aqueous layer. It is 0.0% by mass, more preferably 29.0 to 66.0% by mass.

The aqueous layer can contain components (other components) other than the components B to E. Other ingredients include nonionic surfactants, anionic surfactants, amphoteric surfactants, polyhydric alcohols, pH regulators, refreshing agents, animal and plant-derived extracts, moisturizers, UV absorbers, anti-inflammatory agents, and metal sequestering agents. , Vitamins, antioxidants, preservatives / bactericides, colorants, etc. can be appropriately blended according to the purpose.

Nonionic surfactants include alkyl glyceryl ether, polyoxyalkylene alkyl ether, polyoxyalkylene hardened castor oil, glycol fatty acid ester, glycerin fatty acid ester, polyoxyalkylene glyceryl ether fatty acid ester, and sorbitan fatty acid. Examples thereof include esters, polyoxyalkylene sorbitan fatty acid esters, and glycone surfactants.

Examples of the anionic surfactant include an alkyl sulfate ester salt, a polyoxyethylene alkyl ether sulfate salt, an acyl N-methyl taurine salt, an alkyl ether phosphoric acid ester salt, an N-acyl amino acid salt and the like.

Examples of the amphoteric surfactant include betaine alkyldimethylaminoacetic acid and betaine alkylamide propyldimethylaminoacetic acid.

Examples of the polyhydric alcohol include glycols and glycerins. Specific examples of glycols include ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2-. Examples thereof include pentandiol, 1,2-hexanediol, 1,2-octanediol and 1,2-decanediol. Examples of glycerins include glycerin, diglycerin, and polyglycerin. Among them, from the viewpoint of imparting appropriate moisturization to the hair after application, it is preferable to use a polyhydric alcohol containing one selected from the group of glycerin, diglycerin and polyglycerin. In addition, in this specification, "glycerin" means both "glycerin" and "concentrated glycerin".

The aqueous layer preferably does not contain an organic solvent other than lower alcohols having 2 to 5 carbon atoms and polyhydric alcohols. The emulsifying power of the water layer and the oil layer can be adjusted by using an organic solvent other than lower alcohols having 2 to 5 carbon atoms and polyhydric alcohols, but it is practically not contained because there is a concern of damage to the scalp and hair. Is preferable. In addition, "substantially not contained" in the present specification means "does not contain separately", and does not exclude even a small amount of organic solvent contained in the other components and the like. ..

Two-layer hair cosmetics The oil layer content (oil layer / water layer, mass ratio) with respect to the water layer content in the two-layer hair cosmetics is 20.0/80 from the viewpoint of whether or not the two layers are separated. It is 0.0 or more, preferably 25.0 / 75.0 or more, and more preferably 30.0 / 70.0 or more. Further, the oil layer content (oil layer / water layer) with respect to the water layer content is preferably 70.0 / 30.0 or less, more preferably 65.0 / 35.0, from the viewpoint of whether or not the two layers are separated. It is less than or equal to, more preferably 60.0 / 40.0 or less.

The oil layer and the aqueous layer are preferably colored by blending at least one layer with a pigment or dye from the viewpoint of visually confirming the emulsified state and aesthetics. Further, it is preferable that the product is filled in a transparent or translucent container.

The method for producing the two-layer hair cosmetic of the present invention is not particularly limited, but a method of individually preparing an oil layer and an aqueous layer and then adding one of them can be used.

The two-layer hair cosmetic of the present invention can easily emulsify the oil layer and the water layer at the time of use, is not sticky, and can be applied evenly to the entire hair, and thus is used as an out bath treatment that does not wash away. Is preferable.

As a method of using the two-layer hair cosmetic of the present invention, the product is shaken well before use to emulsify the oil layer and the aqueous layer, and then an appropriate amount is taken out to the palm before the start of separation between the oil layer and the aqueous layer. An example of this method is to stretch it well with the palm of your hand, apply it to the hair, and then dry it by natural drying or blow drying.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to these Examples. Unless otherwise specified, the blending amount represents "mass%", and the blending components are converted into pure content.

The main components used in Examples and Comparative Examples are shown.
Ingredient A
Highly polymerized dimethicone: 25 ° C kinematic viscosity 18 million mm ² / s
Other ingredients (oil layer)
Non-volatile silicone oil 1: KF 96-350CS (manufactured by Shin-Etsu Chemical Co., Ltd.)
Non-volatile silicone oil 2: DOWN CORNING TORAY SH200 C FLUID 60,000 CS (manufactured by Toray Dow Corning Co., Ltd.)
Liquid paraffin: Carnation (manufactured by Sonneborn Inc)
Hydrogenated polyisobutene: Marcazole R (manufactured by Maruzen Petrochemical Co., Ltd.)
Ingredient B
Ethanol: 95 ° General fermented alcohol component C
Lauryltrimonium chloride: Cotamine 24P (manufactured by Kao Corporation, pure content 27%, isopropanol 20%, water 53%)
CAE: N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate (manufactured by Ajinomoto Co., Inc.)
Ingredient D
Hydroxypropyl Methyl Cellulose: Metrose 60SH-4000 (manufactured by Shin-Etsu Chemical Co., Ltd.)
Other components (water layer)
Stearyltrimonium chloride: Coatamine 86W (Made by Kao Corporation, pure 28%, water 72%)
Sodium chloride: Nacle M (manufactured by Naikai Salt Industries, Ltd.)
Glycerin: Concentrated cosmetic glycerin (Sakamoto Yakuhin Kogyo Co., Ltd.)
PPG-2-Decess-7: EMALEX DAPE-0207 (manufactured by Nippon Emulsion Co., Ltd.)

Preparation of Samples For evaluation tests of Examples 1 to 10 and Comparative Examples 1 to 9 by filling a transparent round PET container with a two-layer hair cosmetic prepared according to each composition shown in Tables 1 to 3. A sample was prepared. Each of the obtained samples was subjected to the following evaluation test. The results are also shown in Tables 1 to 3.

Evaluation test of usability After shaking each sample of Examples and Comparative Examples well, take out an appropriate amount on the palm, stretch it well with the palm, apply it to the hair bundle (30 cm) of artificial hair, and let it blend in, stickiness and applicability. Was evaluated according to the following criteria.
<Evaluation criteria for stickiness>
◎ (Very good): 9 or more out of 10 responded that there was no stickiness ○ (Good): 7 to 8 out of 10 responded that there was no stickiness △ (Slightly poor): 4 to 4 out of 10 6 responded that there was no stickiness × (defective): 3 or less out of 10 responded that there was no stickiness <Evaluation criteria for coatability>
◎ (Very good): 9 or more out of 10 responded that there was no dripping from the palm and it spreads well to the hair and has good coatability. ○ (Good): 7 to 8 out of 10 However, there is no dripping from the palm, it spreads well to the hair, and it has good coatability. △ (Slightly poor): 4 to 6 out of 10 people did not hang down from the palm and went to the hair. Good spreadability and good coatability × (poor): 3 or less out of 10 responded that there was no dripping from the palm and it spreads well to the hair and has good coatability.

Evaluation of Ease of Emulsification The samples of Examples and Comparative Examples were shaken until the oil layer and the aqueous layer were emulsified and became uniform, and the ease of emulsification was evaluated according to the following criteria.
<Evaluation criteria for ease of emulsification>
◎ (Very good): 9 or more out of 10 responded that they could easily emulsify ○ (Good): 7 to 8 out of 10 responded that they could easily emulsify △ (Slightly poor): Out of 10 4 to 6 responded that they could easily emulsify × (bad): 3 or less out of 10 responded that they could easily emulsify

Evaluation of emulsification and separation After shaking each sample of Examples and Comparative Examples until the oil layer and the aqueous layer were emulsified and became uniform, the sample was allowed to stand in a constant temperature environment, and after 5 minutes, the emulsified state and after 1 hour, The separated state after 3 hours and 5 hours was visually confirmed and evaluated according to the following criteria.
<Evaluation criteria for emulsified state>
◎ (Very good): Uniformly clouded, emulsified state can be confirmed, and separation is not observed.
◯ (Good): It becomes cloudy and an emulsified state can be confirmed, but a slight oil layer separated in the upper layer is observed.
Δ (Slightly poor): It becomes cloudy and an emulsified state can be confirmed, but a separated oil layer is observed in the upper layer, and a separated aqueous layer is also observed in the lower layer.
× (defective): The emulsified state could not be confirmed, and the oil layer and the aqueous layer were separated.
<Evaluation criteria for separated state>
◯ (Good): The emulsified state could not be confirmed, and the two layers were separated with a clear interface.
Δ (Slightly defective): An emulsified layer of 1/3 or less of the total product is observed near the interface due to poor separation.
X (defective): An emulsified layer of 1/3 or more of the total volume is observed near the interface due to poor separation.

From the results in Tables 1 to 3, the two-layer hair cosmetic of the present invention is easy to emulsify between the oil layer and the water layer at the time of use, and the oil layer is formed after use, even though the hair cosmetic has a sufficient oil layer. Since it separates quickly from the water layer, it is easy to use and has excellent aesthetics, and it is not sticky at the time of use, and it is excellent in applicability to the entire hair.

An example of prescribing the two-layer hair cosmetic of the present invention is shown below.
Prescription example 1
Highly polymerized dimethicone 3.0% by mass
Hydrogenated polyisobutene 25.0% by mass
Decamethylcyclopentasiloxane 5.0% by mass
Isononyl isononanoate 5.0% by mass
Cetyl octanoate 4.0% by mass
t-Butylmethoxydibenzoylmethane 0.02% by mass
Ethylhexyl methoxycinnamate 0.5% by mass
Ethanol 17.0% by mass
Diglycerin 6.0% by mass
Hydroxypropyl guar gum 0.3% by mass
N-coconut oil fatty acid acyl-L-arginine ethyl
DL-Pyrrolidone Carboxylate 0.2% by Mass
Sodium chloride 0.2% by mass
Citric acid 0.01% by mass
Sodium citrate 0.05% by mass
Disodium edetate 0.05% by mass
Purified water 33.67% by mass
Total 100.00% by mass

Prescription example 2
Highly polymerized dimethicone 3.5% by mass
Hydrogenated polyisobutene 30.0% by mass
Tri (caprylic acid / capric acid) glyceryl 7.0% by mass
α-olefin oligomer 3.0% by mass
t-Butylmethoxydibenzoylmethane 0.02% by mass
Ethylhexyl methoxycinnamate 0.5% by mass
Fragrance 0.8% by mass
Ethanol 15.0% by mass
Polyglycerin 4.0% by mass
Hydroxyethyl cellulose 0.25% by mass
Lauryltrimonium chloride 0.11% by mass
Isopropanol 0.08% by mass
PPG-2-Decess-7 0.2% by mass
Citric acid 0.01% by mass
Sodium citrate 0.05% by mass
Disodium edetate 0.05% by mass
Purified water 35.43% by mass
Total 100.00% by mass

Claims (2)

A two-layer hair cosmetic consisting of an oil layer containing the following component A and an aqueous layer containing the following component B, the following component C, the following component D and the following component E.
The oil layer content (oil layer / water layer, mass ratio) with respect to the water layer content is 20.0 / 80.0 or more.
A two-layer hair cosmetic having a content of component B in the aqueous layer of 20 to 32% by mass.
Component A: Dimethicone and / or dimethiconol having a kinematic viscosity of 100,000 mm ² / s or more at 25 ° C. Component B: Lower alcohol having 2 to 5 carbon atoms Component C: Lauryltrimonium chloride and / or N-coconut oil fatty acid acyl -L-arginine ethyl DL-pyrrolidone carboxylate Component D: Water-soluble polymer thickener Component E: Water The two-layer hair cosmetic according to claim 1, wherein the content of the component C in the two-layer hair cosmetic is 0.01 to 0.30% by mass.