JP2018162222A - Two-layer type hair cosmetics - Google Patents

Abstract

[Problem] To provide a hair cosmetic in which an oil layer and an aqueous layer are easily emulsified at the time of use, and the oil layer and the aqueous layer are quickly separated after use, even though the oil cosmetic layer contains a sufficient oil layer. To provide a hair cosmetic which is excellent in application properties to the entire hair and has excellent storage stability. An oil layer containing dimethicone and / or dimethiconol (component A) having a kinematic viscosity at 25 ° C of 100,000 mm2 / s or more, a lower alcohol having 2 to 5 carbon atoms (component B), lauryltrimonium An aqueous layer containing chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl / DL-pyrrolidone carboxylate (Component C), a water-soluble polymer thickener (Component D) and water (Component E) A hair cosmetic, wherein the content of the oil layer relative to the content of the aqueous layer is 20.0 / 80.0 or more, and the content of the component B is 20 to 32% by mass. [Selection diagram] None

Description

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

  Hair is damaged by the influence of ultraviolet rays, blow, brushing, shampooing, coloring, etc., and symptoms such as dryness, firmness and stiffness, a decrease in gloss, deterioration of fingering and cohesion occur. Conventionally, for the purpose of improving these symptoms, hair cosmetics that are not washed off have been put on the market.

  Hair cosmetics that are not washed off generally improve the above symptoms by forming an oil film on the hair with an oil such as silicone. In particular, it is known that hair cosmetics containing highly polymerized dimethicone are easily stretched uniformly and are excellent in improving effects such as fingering, cohesion, and gloss. Further, it is known that an improvement effect can be obtained by adding a high amount of highly polymerized dimethicone.

  In addition, as a dosage form of hair cosmetics that are not washed away, an oil type containing almost no water, an emulsified type containing water or a surfactant in an oil agent, an oil layer containing an oil agent, and an aqueous layer containing water or a surfactant There are two-layer types including two layers. 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 elongation, and difficulty in spreading over the entire hair. As an emulsification 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 a surfactant in order to add a high amount of the oil agent in the emulsion internal phase, there is a problem that stickiness derived from 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 the two-layer hair cosmetics, shake the product well before use to emulsify the oil layer and the water layer, take it out before starting the separation of the oil layer and the water layer, and stretch it well with the palm before hair It is common to use 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 hair cosmetic that does not wash away, and includes two layers of an oil layer containing a high concentration of highly polymerized dimethicone and an aqueous layer containing a water-soluble polymer thickener.

JP 2009-161508 A

  The hair cosmetic described in Patent Document 1 adjusts the emulsifying power of the oil layer and the water layer by blending the water layer with a water-soluble polymer thickener, water, a specific surfactant and an organic solvent. However, there is concern over damage to the scalp and hair caused by organic solvents. Furthermore, blending lauryltrimonium chloride and N-coconut fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate as a cationic surfactant is not disclosed.

  The present invention is a two-layer hair cosmetic that can easily emulsify an oil layer and an aqueous layer at the time of use, and can quickly separate the oil layer and the aqueous layer after use, even though the oil layer is sufficiently contained. It is an object of the present invention to provide a two-layer hair cosmetic that does not become sticky during use and has excellent applicability to the entire hair.

That is, the present invention
(1) A two-layer hair cosmetic comprising two layers 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,
Oil layer content (oil layer / water layer, mass ratio) to water layer content is 20/80 or more,
Two-layer hair cosmetic composition containing 20 to 32% by mass of component B in water layer Component A: Dimethicone and / or dimethiconol having a kinematic viscosity at 25 ° C. of 100,000 mm ² / s or more Component B: Carbon 2 to 5 lower alcohols 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 composition according to (1), wherein the content of component C is 0.01 to 0.30% by mass.

  The two-layer hair cosmetic composition of the present invention is easy to emulsify the oil layer and the water layer at the time of use even though the oil layer is sufficiently contained, and the oil layer and the water layer quickly separate after use. Easy to use and excellent in aesthetics. Furthermore, the two-layer hair cosmetic composition 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 composition of the present invention comprises an oil layer containing dimethicone and / or dimethiconol having a kinematic viscosity at 25 ° C. of 100,000 mm ² / s or more, a lower alcohol having 2 to 5 carbon atoms, and lauryltrimonium A water layer containing chloride and / or N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate, a water-soluble polymer thickener and water.

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

  The two-layer hair cosmetic composition of the present invention may further contain components (other components) other than the components A to E described above. As for said component, for example, component AE and another component, only 1 type may respectively be used and 2 or more types 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 at 25 ° C. of 100,000 mm ² / s or more. The kinematic viscosity at 25 ° C. of component A is the viewpoint of the finish after use of the two-layer hair cosmetic of the present invention (lightness as a finger, gloss, goodness of unity, softness of the hair when finished) To 100,000 mm ² / s or more, preferably 5 million mm ² / s or more, more preferably 10 million mm ² / s or more. The upper limit of the kinematic viscosity at 25 ° C. of Component A is not particularly limited, but is preferably 30 million or less.

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

  The content of component A in the two-layer hair cosmetic is easy to extend into the hair, and is 0.5% by mass or more from the viewpoint of improving effects such as fingering, cohesion, and gloss, and the softness of the hair when finished. Is preferable, more preferably 0.8% by mass or more, and still more preferably 1.0% by mass or more. In addition, the content of Component A is preferably 10.0% by mass or less, more preferably 7.0% by mass or less, and still more preferably from the viewpoint of lightness of the finished hair and applicability to the hair. Is 5.0 mass% or less.

  The oil layer preferably contains volatile oil. In addition to the role of the component A as a solubilizer, the volatile oil can improve the applicability and further exert the effect of the remaining component A by volatilizing after application.

  Examples of volatile oils include hydrocarbon oils that are volatile at standard atmospheric pressure and silicone oils that are volatile at standard atmospheric pressure. As for volatile oil, only 1 type may be used and 2 or more types may be used. In this specification, having volatility under standard atmospheric pressure means that the boiling point at standard atmospheric pressure is 300 ° C. or lower.

  Examples of the hydrocarbon oil having volatility under the 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, even if it contains a large amount of component B and the density of the aqueous layer (mass per unit volume) is low, it is easy to adjust the separation rate between the oil layer and the aqueous layer. 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 from the viewpoint of solubility of Component A and applicability to hair. It is 0 mass% or more, More preferably, it is 13.0 mass% or more. Further, the content of the volatile oil is preferably 50.0% by mass or less, more preferably 45.0% by mass or less, and further preferably 40.0% by mass, from the viewpoint of reducing the roughness of the hair after application. % Or less.

  The oil layer preferably contains components (other components) other than the component A and the volatile oil from the viewpoint of feeling of use. Other ingredients include oils that are liquid at room temperature (oils other than the volatile oils and may be referred to as non-volatile oils below), oils that are solid at room temperature such as petrolatum and shea fat, and antioxidants such as tocopherols. Agents, ultraviolet absorbers such as 2-ethylhexyl paramethoxycinnamate, oil-soluble dyes such as Red No. 215, Red No. 223, Daidai 201 and Daisai 205, and various fragrances. In addition, in this specification, room temperature represents the temperature range of 1-30 degreeC.

  Examples of the liquid oil at room temperature include liquid hydrocarbon oil, liquid ester oil, liquid silicone oil, liquid oil and fat, liquid wax, liquid fatty acid and the like.

  Specific liquid hydrocarbon oils include, for example, α-olefin oligomer, liquid isoparaffin, squalane, synthetic squalane, vegetable squalane, liquid isoparaffin, liquid paraffin and the like.

  Specific liquid ester oils include, for example, isostearyl isostearate, isopropyl isostearate, isodecyl isononanoate, isononyl isononanoate, octyl isononanoate, cetyl ethylhexanoate, cetyl octanoate, oleyl oleate, propylene glycol diisostearate , Diethylpentanoic acid neopentylene glycol, dicapric acid neopentyl glycol, tetraoctanoic acid pentaerythrityl, triisostearic acid trimethylolpropane, triethylhexanoic acid erythrityl, trioctanoin, tri (caprylic acid / capric acid) glyceryl, palmitic acid Isopropyl, ethylhexyl palmitate, jojoba ester, isostearyl myristate, isopropyl myristate, myristic acid Kuchirudodeshiru, such as malic acid diisostearyl and the like.

  Specific examples of the liquid silicone oil include chain silicones such as methylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, and dimethiconol other than the component A and the volatile oil, methylcyclopolysiloxane, octaoctane. Cyclic silicone such as methylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, aminopropylmethylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylsiloxane / dimethylsiloxane copolymer, aminoethylaminopropylmethylsiloxane・ Amino modified silicone such as dimethylsiloxane copolymer, carboxy modified silicone, fatty acid modified silicone, alcohol modified silicone, aliphatic alcohol Le-modified silicone, epoxy-modified silicones, fluorine-modified silicones, and modified silicone such as an alkyl-modified silicone.

  Specific examples of liquid 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. It is 0.5-20.0 mass%, More preferably, it is 1.0-10.0. When the content of other components exceeds 40.0% by mass, stickiness tends to occur.

Aqueous layer The aqueous layer is composed of 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), Contains 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. Furthermore, the elongation in the hair is improved.

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

  Content in the water layer of the said component B is 20 mass% or more, 22 mass% or more is preferable, More preferably, it is 24 mass% or more. When the content of Component B in the aqueous layer is less than 20% by mass, the cosmetic is foamed and tends to be inferior in use feeling and aesthetics. Moreover, content in the water layer of the said component B is 32 mass% or less, 30 mass% or less is preferable, More preferably, it is 28 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 be lowered and it may be difficult to separate from the oil layer, and the alcohol odor may be strong and uncomfortable.

  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 separation rate into two layers after emulsification and elongation on the hair. It is at least mass%. In addition, 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 suppression of alcohol odor and use feeling.

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

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

  The content of the component C in the two-layer hair cosmetic is preferably 0.01% by mass or more from the viewpoint of easy emulsification of the oil layer and the aqueous layer, the viewpoint of the separation rate into two layers, and the antiseptic effect. More preferably, it is 0.02 mass% or more, More preferably, it is 0.03 mass% or more. Further, the content of component C is preferably 0.30 or less, more preferably 0.25% by mass or less, further preferably 0.22% by mass or less, and most preferably 0, from the viewpoint of safety. .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 feeling of use 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 methylcellulose, methylcellulose, and hydroxypropyl guar gum, and synthetic polymers such as carboxyvinyl polymer. . Of these, hydroxypropylmethylcellulose is preferred because of its excellent usability.

  The content of component D in the two-layer hair cosmetic composition is 0.02% by mass from the viewpoint of whether to separate into two layers after emulsification, and to impart an appropriate viscosity to improve the feeling of use. The above is preferable, More preferably, it is 0.05 mass% or more, More preferably, it is 0.10 mass% or more. When the content of the component D is less than the lower limit, the oil layer and the water layer can be emulsified by shaking, but the emulsified particles are too fine because the viscosity of the cosmetic is insufficient, and coalescence hardly occurs. Tend to be difficult to do. In addition, the content of component D is preferably 0.8% by mass or less, more preferably 0.6% by mass or less, and still more preferably 0. 0% by mass from the viewpoint of stickiness during use and separation rate into two layers. 5% by mass or less. When the content of component D exceeds the above upper limit, the viscosity of the cosmetic becomes too high, the movement of the emulsified particles becomes dull, coalescence hardly occurs, and it tends to be difficult to separate.

  Although the water of the said component E will not be specifically limited if it can be used as a cosmetics raw material, Usually, purified water is used. The content of 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 mass%, More preferably, it is 29.0-66.0 mass%.

  The aqueous layer may contain components (other components) other than the components B to E. Other ingredients include nonionic surfactants, anionic surfactants, amphoteric surfactants, polyhydric alcohols, pH adjusters, fresheners, extracts derived from animals and plants, moisturizers, UV absorbers, flame retardants, metal sequestering agents. Vitamins, antioxidants, antiseptic / bactericides, colorants, and the like can be appropriately blended according to the purpose.

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

  Examples of the anionic surfactant include alkyl sulfate ester salts, polyoxyethylene alkyl ether sulfate salts, acyl N-methyl taurate salts, alkyl ether phosphate ester salts, and N-acyl amino acid salts.

  Examples of amphoteric surfactants include alkyldimethylaminoacetic acid betaines and alkylamidopropyldimethylaminoacetic acid betaines.

  Examples of the polyhydric alcohol include glycols and glycerins. Specific examples of glycols include, for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, isoprene glycol, 1,3-butylene glycol, 1,2-butanediol, 1,2- Examples include pentanediol, 1,2-hexanediol, 1,2-octanediol, and 1,2-decanediol. Examples of glycerins include glycerin, diglycerin, and polyglycerin. Especially, it is preferable to use the polyhydric alcohol containing 1 type chosen from the group of glycerin, diglycerin, and polyglycerin from a viewpoint of providing moderate moisture to the hair after application | coating. In the present specification, “glycerin” means both “glycerin” and “concentrated glycerin”.

  It is preferable that the water layer does not contain an organic solvent excluding a lower alcohol having 2 to 5 carbon atoms and a polyhydric alcohol. The emulsifying power of the water layer and the oil layer can be adjusted with an organic solvent excluding lower alcohols and polyhydric alcohols having 2 to 5 carbon atoms, but it is not substantially contained because there is concern about damage to the scalp and hair. It is preferable. In the present specification, “substantially does not contain” means “not contained separately”, and does not exclude even a small amount of organic solvent contained in the other components. .

Two-layer hair cosmetic The oil layer content (oil layer / water layer, mass ratio) with respect to the water layer content in the two-layer hair cosmetic is 20.0 / 80 from the viewpoint of whether or not to separate into two layers. 0.0 or more, preferably 25.0 / 75.0 or more, 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. Or less, more preferably 60.0 / 40.0 or less.

  The oil layer and the water layer are preferably colored by blending pigments or dyes in at least one layer from the viewpoint of visually confirming the emulsified state and aesthetics. Furthermore, it is preferable to use a product filled in a transparent or translucent container.

  The method for producing the two-layer hair cosmetic composition of the present invention is not particularly limited, and may be a method of adding one after separately preparing the oil layer and the water layer.

  The two-layer hair cosmetic composition of the present invention can easily emulsify an oil layer and an aqueous layer at the time of use, is non-sticky, and can be uniformly applied to the entire hair, so that it is an out bath treatment that does not wash away. It is preferable.

  As a method of using the two-layer hair cosmetic composition of the present invention, shake the product well before use to emulsify the oil layer and the aqueous layer, and then take out an appropriate amount on the palm before starting the separation of the oil layer and the aqueous layer, Examples of the method include a method in which the hair is stretched well with the palm of the hand, applied to the hair, and then dried by natural drying or blow drying.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to these Examples. Unless otherwise specified, the blending amount represents “mass%”, and the blending component was converted to a pure component.

The main components used in Examples and Comparative Examples are shown.
Component A
High polymerization dimethicone: Kinematic viscosity at 25 ° C. 18 million mm ² / s
Other ingredients (oil layer)
Nonvolatile silicone oil 1: KF 96-350CS (manufactured by Shin-Etsu Chemical Co., Ltd.)
Nonvolatile silicone oil 2: DOW CORNING TORAY SH200 C FLUID 60,000 CS (manufactured by Toray Dow Corning Co., Ltd.)
Liquid paraffin: Carnation (Sonneborn Inc.)
Hydrogenated polyisobutene: Marcazole R (manufactured by Maruzen Petrochemical Co., Ltd.)
Component B
Ethanol: 95 ° general fermented alcohol component C
Lauryltrimonium chloride: Cotamine 24P (manufactured by Kao Corporation, 27% pure, 20% isopropanol, 53% water)
CAE: N-coconut oil fatty acid acyl-L-arginine ethyl DL-pyrrolidone carboxylate (manufactured by Ajinomoto Co., Inc.)
Component D
Hydroxypropyl methylcellulose: Metroles 60SH-4000 (manufactured by Shin-Etsu Chemical Co., Ltd.)
Other ingredients (water layer)
Stearyl trimonium chloride: Cotamine 86W (manufactured by Kao Corporation, 28% pure, 72% water)
Sodium chloride: Nakuru M (manufactured by Naikai salt industry)
Glycerin: Concentrated glycerin for cosmetics (Sakamoto Pharmaceutical Co., Ltd.)
PPG-2-Decess-7: EMALEX DAPE-0207 (manufactured by Nippon Emulsion Co., Ltd.)

Sample Preparation 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 described in Tables 1 to 3. Samples were prepared. Each obtained sample was subjected to the following evaluation test. The results are shown in Tables 1 to 3, respectively.

Usability evaluation test After shaking each sample of Example and Comparative Example well, take out an appropriate amount to the palm, stretch well with the palm, apply to the hair bundle (30 cm) of artificial hair, stickiness and applicability Were 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): 7-8 out of 10 responded that there was no stickiness △ (somewhat bad): 4 out of 10 6 respondents with no stickiness x (defect): 3 or less of 10 respondents with no stickiness <Evaluation criteria for applicability>
◎ (Very good): Nine or more of 10 people answered that there was no dripping from the palm and the hair was well-familiar and had good applicability ○ (Good): 7 to 8 of 10 people However, there is no dripping from the palm and the hair is well-familiar with the hair, and it is well applied. △ (Slightly poor) Response to good stretchability and good applicability x (defect): 3 or less of 10 respondents answered that there was no drooping from their palms and they were familiar to stretch and had good applicability.

Evaluation of Easiness of Emulsification Each sample of Examples and Comparative Examples was shaken until the oil layer and the aqueous layer were emulsified and 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 be easily emulsified ○ (good): 7-8 out of 10 responded that they could be easily emulsified △ (somewhat poor): out of 10 4-6 respondents can easily emulsify x (bad): 3 out of 10 respondents can easily emulsify

Evaluation of emulsification and separation Each sample of Examples and Comparative Examples was shaken until the oil layer and the aqueous layer were emulsified and uniform, and then allowed to stand in a constant temperature environment. After 5 minutes, and after 1 hour, The separation state after 3 hours and after 5 hours was visually confirmed and evaluated according to the following criteria.
<Evaluation criteria for emulsified state>
A (very good): It becomes cloudy uniformly, the emulsified state can be confirmed, and no separation is observed.
○ (good): It becomes cloudy and an emulsified state can be confirmed, but a slightly separated oil layer is observed in the upper layer.
Δ (slightly poor): clouded and an emulsified state can be confirmed, but a separated oil layer is observed in the upper layer, and a separated water layer is also observed in the lower layer.
X (Bad): The emulsified state cannot be confirmed, and the oil layer and the aqueous layer are separated.
<Evaluation criteria for separation state>
○ (Good): The emulsified state cannot be confirmed, and the interface is clear and separated into two layers.
Δ (slightly poor): An emulsified layer of 1/3 or less of the total volume is observed near the interface due to poor separation.
X (defect): An emulsified layer of 1/3 or more of the total volume is observed near the interface due to poor separation.

  From the results of Tables 1 to 3, the two-layer hair cosmetic composition of the present invention is easy to emulsify the oil layer and the water layer at the time of use, even though the oil layer sufficiently contains the oil layer, and the oil layer after use. It can be seen that it is easy to use and excellent in aesthetics because it separates quickly from the water layer, and is not sticky during use and excellent in applicability to the entire hair.

Below, the formulation example of the 2 layer type hair cosmetics of this invention is shown.
Formulation Example 1
High polymerization 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-pyrrolidonecarboxylate 0.2% by mass
Sodium chloride 0.2% by mass
Citric acid 0.01% by mass
Sodium citrate 0.05% by mass
Edetate disodium 0.05 mass%
Purified water 33.67% by mass
Total 100.00% by mass

Formulation 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
Edetate disodium 0.05 mass%
Purified water 35.43% by mass
Total 100.00% by mass

Claims (2)

An oil layer containing the following component A, and a two-layer hair cosmetic comprising two layers of the following component B, the following component C, the following component D, and the aqueous layer containing the following component E,
Oil layer content (oil layer / water layer, mass ratio) with respect to water layer content is 20.0 / 80.0 or more,
A two-layer hair cosmetic wherein the content of component B in the aqueous layer is 20 to 32 mass%.
Component A: Dimethicone and / or dimethiconol having a kinematic viscosity at 25 ° C. of 100,000 mm ² / s or more Component B: Lower alcohol having 2 to 5 carbon atoms Component C: Lauryltrimonium chloride and / or N-coconut oil fatty 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.