JP5802509B2 - Multi-layer cosmetic - Google Patents

Description

  The present invention relates to a multi-layer cosmetic having a layer structure of at least an emulsified layer and an aqueous layer at the time of standing.

  Conventionally, multilayer cosmetics that are separated into multiple layers before use and are applied to the skin after shaking and mixing during use are known. This multilayer cosmetic is a uniform emulsion or powder dispersion by shaking, and the oil or powder dispersed by standing still gathers at the upper or lower part, and again becomes a multilayer (for example, Patent Documents 1 and 2).

  Such multilayer cosmetics are liquid cosmetics and are often composed of two layers of an aqueous layer-oil layer and an aqueous layer-powder layer, and one layer or both layers are mixed with a colorant. By coloring, it is possible to give beauty in appearance in a state where it is left still and separated into multiple layers.

  However, when a coloring agent is blended, the coloring agent adheres to the skin during use, which may be aesthetically undesirable. Therefore, it has been studied to maintain an aesthetic appearance in a state of being separated into multiple layers by using an opaque emulsion layer instead of adding a colorant to at least one layer (see Patent Document 3).

Japanese Patent Laid-Open No. 4-112811 Japanese Patent No. 3975060 Japanese Patent No. 4183873

  In the multilayer cosmetics described in Patent Documents 1 and 2, it is not intended that the emulsified layer is stably present because it is immediately separated into water and oil after shaking. In addition, the multilayer cosmetic described in Patent Document 3 is a two-layer cosmetic that is separated into a cloudy emulsified layer and a transparent water layer, but is difficult to separate into an emulsified layer and an aqueous layer and is clean. It takes time to return to the second layer. Further, when used over time, it was not possible to obtain a satisfactory multi-layer cosmetic such as oil floating and separation easily occurring in the emulsion layer and poor stability over time.

  Accordingly, the problem of the present invention is a multilayer cosmetic having a layer structure of at least an emulsified layer and an aqueous layer at the time of standing, which is excellent in stability over time, redispersion / separability, and usability. It is to provide a multi-layered cosmetic.

  As a result of various studies to obtain a multilayer cosmetic having excellent stability over time using a combination of various surfactants and thickeners, the present inventors have found that a specific HLB polyoxyethylene alkyl ether, polyoxyethylene As a result of using a combination of hydrogenated castor oil and polysaccharides, it was found that a multilayer cosmetic having a layer structure of at least an emulsified layer and an aqueous layer at the time of standing can be obtained, and further, the pH conditions were examined. The present inventors have found that a multi-layered cosmetic material having excellent temporal stability and usability can be obtained.

That is, the present invention is a multilayer cosmetic comprising the following components (A) to (D) and having a layer structure of at least an emulsified layer and an aqueous layer at the time of standing: Is a multi-layered cosmetic material having a viscosity of 6.5 to 8.5.
(A) Polyoxyethylene alkyl ether having an HLB of 6.5 or less (B) Polyoxyethylene hydrogenated castor oil having an HLB of 8 to 15 (C) Oil at a pressure of 1 atm and 25 ° C. (D) Polysaccharide

  It is possible to provide a multilayer cosmetic that has a clear interface when separated, has excellent redispersibility, is non-sticky, and has excellent stability over time.

  In the present invention, the “multilayer type” means having a layer structure of at least two layers of an emulsified layer and an aqueous layer at the time of standing in an environment of 25 ° C., for example, an emulsified layer-water layer, an emulsified layer. -It can take layer structure, such as water layer-powder layer.

  As the polyoxyethylene alkyl ether (A) with an HLB of 6.5 or less used in the present invention, any polyoxyethylene alkyl ether having an HLB of 6.5 or less depending on the average polyoxyethylene number and the carbon number of the alkyl group may be used. Specifically, ceteth-1 (HLB: 3.3), octyldedes-2 (HLB: 4.1), steareth-2 (HLB: 4.4), isosteares-2 (HLB: 4.5), ores- 2 (HLB: 4.5), ceteth-2 (HLB: 4.9), ceteares-2 (HLB: 4.6), isosteares-3 (HLB: 5.7), oleth-3 (HLB: 5. 7), steareth-3 (HLB: 5.6), ceteares-3 (HLB: 5.9), trideceth-2 (HLB: 5.7), nonoxynol-2 (HLB: 6.0), laureth-2 (HLB: 6.1) It can be mentioned.

  The HLB of the polyoxyethylene alkyl ether is preferably 6.5 or less, more preferably 3 to 6.5, and even more preferably 4 to 6 from the viewpoint of improving redispersibility and stability over time.

  In the present invention, HLB (Hydrophile-Lipophile Balance) is calculated by HLB = (Σinorganic value / Σorganic) × 10. Here, for each of the “inorganic value” and “organic value”, for example, “organic value” is 20 for one carbon atom in the molecule, and “inorganic value” is 100 for one hydroxyl group. As described above, “inorganic value” and “organic value” corresponding to various atoms or functional groups are set (for example, Yoshio Koda, “Organic Conceptual Diagram-Fundamentals and Applications”, pages 11-17, Sankyo Publishing 1984. The HLB value of the organic compound is calculated by integrating the “inorganic value” and “organic value” of all atoms and functional groups in the organic compound.

  The content of the component (A) with respect to the total amount of the cosmetic is preferably 0.1 to 5% by mass, more preferably 0.1 to 3%, from the viewpoint of improving the stability over time and suppressing the sticky / sticky feeling. It is mass%, and 0.1-1.5 mass% is still more preferable.

  Examples of the (B) polyoxyethylene hydrogenated castor oil having an HLB of 8 to 15 used in the present invention include polyoxyethylene hydrogenated castor oil having an average polyoxyethylene number of 15 or more. Specifically, polyoxyethylene (20) Hardened castor oil (HLB: 9.4), polyoxyethylene (30) hardened castor oil (HLB: 11), polyoxyethylene (40) hardened castor oil (HLB: 12.1), hardened polyoxyethylene (50) Castor oil (HLB: 12.9), polyoxyethylene (60) hydrogenated castor oil (HLB: 13.6), polyoxyethylene (80) hydrogenated castor oil (HLB: 14.6) and the like can be mentioned.

  The HLB of the polyoxyethylene hydrogenated castor oil is preferably 8-15, more preferably 9-15, and even more preferably 9-14 from the viewpoint of improving redispersibility and stability over time.

  The content of the component (B) with respect to the total amount of the cosmetic is preferably 0.1 to 5% by mass, more preferably 0.1 to 3%, from the viewpoint of improving the stability over time and suppressing the sticky / sticky feeling. % By mass, and more preferably 0.5 to 1.5% by mass.

  The content mass ratio (A / B) of the component (A) and the component (B) in the cosmetic composition of the present invention is preferably 0.05 to 5 from the viewpoint of improving stability over time, stickiness, and feeling of sliminess. 0.1-2 are more preferable.

  The (C) liquid oil agent in the present invention is not particularly limited as long as it is an oil agent having fluidity under an atmosphere of 1 atm and 25 ° C. Specifically, hydrocarbons such as α-olefin oligomer, light liquid isoparaffin, light liquid paraffin, heavy liquid isoparaffin, heavy liquid paraffin, squalane; glyceryl trioctanoate, avocado oil, olive oil, sesame oil, rice bran oil, safflower Oil, soybean oil, corn oil, rapeseed oil, castor oil, cottonseed oil, mink oil, etc .; fatty acids such as oleic acid and isostearic acid; diisopropyl sebacate, isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl oleate , Ethyl linoleate, isopropyl linoleate, cetyl caprylate, hexyl laurate, decyl myristate, decyl oleate, oleyl oleate, isostearyl laurate, isotridecyl myristate, Isocetyl stinate, isostearyl myristate, octyldodecyl myristate, octyl palmitate, isocetyl palmitate, isostearyl palmitate, propylene glycol dioleate, isodecyl oleate, isopropyl istearate, cetyl 2-ethylhexanoate, 2-ethyl Ester oils such as stearyl hexanoate, propylene glycol dicaprate, propylene glycol dioleate, glyceryl tri-2-ethylhexanoate, glyceryl tri (capryl / caprate), 2-ethylhexyl paramethoxycinnamate; 2-octyldodecanol, Branched or unsaturated higher alcohols such as isostearyl alcohol and oleyl alcohol; dimethylpolysiloxane, tris (trimethylsiloxy) methylsilane And the like. These oil agents can use 1 type (s) or 2 or more types.

  Of these, α-olefin oligomer, heavy liquid isoparaffin, heavy liquid paraffin, avocado oil, olive oil, octyldodecyl myristate, and glyceryl tri-2-ethylhexanoate are preferable.

  In the present invention, (C) 5 to 60 parts by mass of heavy liquid isoparaffin and / or heavy liquid paraffin is preferably contained in 100 parts by mass of liquid oil at 1 atm and 25 ° C., more preferably 10 parts. -50 parts by mass, more preferably 15-40 parts by mass is preferred in terms of improving the stability over time and obtaining a good feeling of use.

  The content of the component (C) with respect to the total amount of the cosmetic is preferably 5 to 20% by mass, more preferably 8 to 17% by mass, and more preferably 10 to 15% by mass from the viewpoint of suppressing the sticky / smooth feeling. Is more preferable.

The polysaccharide (D) in the present invention is a polysaccharide (a carbohydrate represented by C _l (H ₂ O) _m ; l and m are integers) that generate 10 or more monosaccharides by hydrolysis. Here, specific examples of monosaccharides include tetroses such as D-erythrulose, D-erythrose, D-threose, D-arabinose, L-arabinose, D-xylose, D-lyxose, L-lyxose, D-ribose. Aldopentoses such as D-xylulose, L-xylulose, D-ribulose, ketopentoses such as L-ribulose, aldohexoses such as D-galactose, L-galactose, D-glucose, D-talose, D-mannose , L-sorbose, D-tagatose, D-psicose, ketohexoses such as D-fructose, and branched sugars such as D-apiose and D-hamamelose.

  Specific examples of the polysaccharide include guar gum, locust bean gum, queen seed, carrageenan, galactan, gum arabic, tragacanth, pectin, xanthan gum, dextrin, succinoglucan, curdlan, hyaluronic acid and / or a salt thereof, chondroitin sulfate And / or natural polysaccharides such as salts thereof; methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, cationized cellulose, alginic acid and / or a salt thereof, propylene glycol alginate, soluble starch, carboxymethyl Examples include synthetic or semi-synthetic polysaccharides such as starch and methyl starch. Of these, alginic acid and / or a salt thereof, carrageenan, and xanthan gum are preferable. Here, the salt includes alkali metal salts such as sodium and potassium, alkaline earth metal salts such as calcium and magnesium, organic amine salts such as triethanolamine and triethylamine, ammonium salts, and basic amino acid salts such as arginine and lysine. Are preferable, and alkali metal salts are preferable, and sodium salts are more preferable because they are easily available in the market.

  In particular, it is preferable to use alginic acid, which is an anionic polysaccharide or a salt thereof, and carrageenan in combination in order to improve the stability over time.

  The content of the component (D) with respect to the total amount of the cosmetic is preferably 0.01 to 5% by mass, more preferably 0.05 to 2% by mass, from the viewpoint of suppressing the sticky / smooth feeling. More preferably, the content is 1-1.

  In the present invention, in order to further improve the stability over time, it is preferable to use (E) a saturated monohydric alcohol having 1 to 3 carbon atoms in combination. Examples of the saturated monohydric alcohol having 1 to 3 carbon atoms include methyl alcohol, ethyl alcohol, propyl alcohol, and isopropyl alcohol.

  The content of the component (E) with respect to the total amount of the cosmetic is not particularly limited, but is preferably 1 to 10% by mass, more preferably based on the total amount of the cosmetic from the viewpoint of improving the temporal stability. It is 2-8 mass%, More preferably, it is 3-7 mass%.

  In the present invention, it is preferable to further use (F) a polyhydric alcohol in order to adjust the feeling of use. Specifically, dihydric alcohols having 2 to 6 carbon atoms such as propylene glycol, 1,2-pentanediol, 1,3-butylene glycol and dipropylene glycol; 3 having 3 to 6 carbon atoms such as glycerin and isoprene glycol And monohydric alcohols. Of these, propylene glycol and 1,3-butylene glycol are preferred. (F) Although content in the cosmetics of a polyhydric alcohol can be suitably changed with the desired usability | use_condition, 1-35 mass% is preferable with respect to cosmetics total amount, More preferably, it is 5-25. % By mass.

  The water content in the multilayer cosmetic of the present invention may be an amount that can form a multilayer state, and is preferably 30% by mass or more, more preferably 40 to 90% by mass in order to improve re-separation and re-dispersibility. Preferably, 55 to 75% by mass is more preferable.

  The pH of the multilayer cosmetics of the present invention needs to be 6.5 to 8.5 in an environment of 25 ° C. When the pH is less than 6.5, the temporal stability is lowered. There is a tendency, and when it exceeds 8.5, there is a tendency that stickiness and nulliness are strongly felt.

  The multilayer cosmetic of the present invention, when left standing, keeps at least two layers of a white turbid emulsified layer and a water layer separated state, and is easily turbid in a simple shaking state during use (oil-in-water emulsified form). After use, the original multi-layer separation state is restored in a short time from the viewpoint of stability and aesthetics.

  In addition to the above-mentioned components, the multilayer cosmetic of the present invention contains a solid oil agent (higher alcohols, in an environment of 1 atm and 25 ° C. within a range that does not impair the effects of the present invention depending on the purpose. Fatty acids, esters, sterols, sterol fatty acid esters, hydrocarbons, oils and fats), water-soluble polymers, plant extracts, vitamins, antioxidants, antibacterial preservatives, anti-inflammatory agents, insect repellents, physiological Active ingredients, salts, chelating agents, neutralizing agents, pH adjusting agents, fragrances and the like can be blended.

  However, when a large amount of a solid oil agent is blended at 1 atm and 25 ° C., stability at low temperature tends to decrease, so it is preferable not to blend substantially, specifically 3% by mass with respect to the total amount of cosmetics. Hereinafter, it is preferably 1% by mass or less, more preferably 0.1% by mass or less.

  The dosage form of the cosmetic of the present invention is not particularly limited, and can be prepared, for example, as an emulsion, gel, spray, mousse or the like.

  The cosmetics of the present invention can be used without any particular limitation as cosmetics, but hair cosmetics such as shampoos, rinses and conditioners, facial cleansers, cleansing cosmetics, lotions, milky lotions, creams, cosmetics, sunscreen cosmetics. It can be suitably used as skin cosmetics such as cosmetics, packs, and massage cosmetics. Among these, it is particularly preferable to apply as a skin care cosmetic such as lotion and milky lotion.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these. In addition, the unit of content in an Example is all the mass%.

Examples 1-7 and Comparative Examples 1-7
A multilayer cosmetic was prepared according to the formulation shown in Table 1. Using these, the following (1) Functionality test, (2) Stability test over time, (3) pH measurement, and (4) Reseparation test were carried out and evaluated. The results are shown in Table 1.

(1) Sensory test Each sample was used by 10 evaluation panelists, and “skin mass” and “stickiness / nullness” after application were evaluated based on the following evaluation criteria.

(Skin mass evaluation criteria)
4: Good 3: Slightly uncomfortable skin 2: Unsatisfactory skin 1: Unhealthy and uncomfortable

(Evaluation standards for stickiness / nulltsuki)
4: Do not feel sticky or nullki 3: Feel slightly sticky or nullki 2: Feel sticky or nullki 1: Strongly feel sticky or nullki

(Evaluation)
○: Average score of evaluation panel is 3.5 or more Δ: Average score of evaluation panel is 2.5 to less than 3.5 ×: Average score of evaluation panel is less than 2.5

(2) Stability test over time The multilayer cosmetic shown in Table 1 was put in a glass bottle and stored in a thermostat at 50 ° C. and −10 ° C. for 1 month. Based on the state immediately after preparation, the change in appearance after one month was visually determined based on the following criteria.
“Separation” in the following evaluation criteria refers to the state in which the oil in the emulsified layer has separated when the cosmetic is separated into multiple layers after standing, and this test is for the emulsified layer. It relates to stability over time.

(Evaluation criteria)
○: No problem △: Very slight precipitation, separation, etc. ×: Precipitation, separation

(3) pH measurement The multilayer cosmetic was sufficiently shaken (10 times), and the pH value immediately after that was measured using a digital pH meter (manufactured by HORIBA) in an environment of 25 ° C.

(4) Re-separation property test The multilayer cosmetic was sufficiently shaken (10 times) to obtain a uniform cloudy emulsified state, and then left in a thermostatic bath at 25 ° C. Evaluation was performed according to the following criteria depending on the time until separation.

(Evaluation criteria)
○: Separation into two layers within 6 hours, interface was clearly confirmed Δ: Separation into two layers within 6 hours, but interface was not clear ×: Not separated even after more than 6 hours

  The multi-layer cosmetic of the present invention is easily and uniformly mixed by shaking 10 times when used, and becomes a cloudy oil-in-water emulsified state. When left in a thermostatic bath at 25 ° C., the upper part takes about 3 to 5 hours. It was separated into an emulsified layer and a transparent aqueous layer at the bottom, and the interface was clearly confirmed. Further, as is clear from the results in Table 1, the multilayer cosmetic of the present invention had good temporal stability and excellent usability. On the other hand, the multilayer type cosmetic of the comparative example was not satisfactory in any effect. Note that Comparative Example 2 was not evaluated because the oil layer was separated immediately after the adjustment.

Formulation Examples 1-3
Next, a multilayer oil-in-water emulsified cosmetic was prepared by a conventional method according to the following formulation. All are excellent in the sensory effect, and good stability with time is expected.

Formulation Example 1 (Lotion (two-layer type))
Ingredient Mass%
Ethanol 5.0
Polyoxyethylene (40E.O.) hydrogenated castor oil 0.5
Steareth-2 0.1
Glyceryl tri-2-ethylhexanoate 5.0
α-olefin oligomer 5.0
Heavy liquid isoparaffin 2.0
Sodium alginate 0.05
Carrageenan 0.3
1,3-butylene glycol 5.0
Dipropylene glycol 8.0
Sodium polyaspartate solution 1.0
Macadamia nut oil 0.5
Kiwi extract 0.5
Grapefruit extract 0.5
Acerola extract 0.5
Fragrance Fine amount Purified water Residual amount

Formulation Example 2 (Emulsion (two-layer type))
Ingredient Mass%
Ethanol 5.0
Polyoxyethylene (40E.O.) hydrogenated castor oil 1.0
Steareth-2 0.2
Glyceryl tri-2-ethylhexanoate 5.0
Tris (trimethylsiloxy) methylsilane 4.0
α-olefin oligomer 8.0
Heavy liquid isoparaffin 4.0
Sodium alginate 0.1
Carrageenan 0.2
1,3-butylene glycol 10.0
Glycerin 5.0
Sodium polyaspartate solution 1.0
Macadamia nut oil 0.5
Kiwi extract 0.5
Grapefruit extract 0.5
Acerola extract 0.5
Royal Jelly Extract 0.5
Fragrance Fine amount Purified water Residual amount

Formulation Example 3 (Lotion (two-layer type))
Ingredient Mass%
Ethanol 5.0
Polyoxyethylene (40E.O.) hydrogenated castor oil 0.5
Steareth-2 0.1
Glyceryl tri-2-ethylhexanoate 5.0
α-olefin oligomer 2.0
Heavy liquid isoparaffin 5.0
Sodium alginate 0.05
Carrageenan 0.3
1,3-butylene glycol 5.0
Dipropylene glycol 8.0
Sodium polyaspartate solution 1.0
Macadamia nut oil 0.5
Nicotinamide 0.1
Carnitine chloride 0.1
Oat extract 0.5
Fragrance Fine amount Purified water Residual amount

Claims (4)

A multilayer cosmetic comprising the following components (A) to (D), and having a layer structure of at least an emulsified layer and an aqueous layer at the time of standing, wherein the pH is 6.5. A multi-layer cosmetic that is ˜8.5.
(A) Polyoxyethylene alkyl ether having an HLB of 6.5 or less (B) Polyoxyethylene hydrogenated castor oil having an HLB of 8 to 15 (C) Oil at a pressure of 1 atm and 25 ° C. (D) Polysaccharide   The multilayer cosmetic according to claim 1, wherein (A) the polyoxyethylene alkyl ether is HLB 4-6, and (B) the polyoxyethylene hydrogenated castor oil is HLB 9-14.   The multilayer cosmetic according to claim 1 or 2, wherein 5 to 60 parts by mass of heavy liquid isoparaffin and / or heavy liquid paraffin is contained in 100 parts by mass of the component (C).   The multilayer cosmetic according to any one of claims 1 to 3, further comprising (E) a saturated monohydric alcohol having 1 to 3 carbon atoms.