JP2001002553A - Oil-in-water type emulsified cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject cosmetic excellent in stability with time even if formulated with the electrolyte, giving good feeling when used and useful as a lotion, milky lotion, cream or the like by including an N-alkylmethyltaurine salt, nonionic surfactant, oil agent and electrolyte in a specific ratio. SOLUTION: This cosmetic is obtained by including (A) 0.05-5 wt.%, pref. 0.1-2 wt.% of an N-alkylmethyltaurine salt such as an N-stearoylmethyltaurine sodium salt, (B) 0.01-10 wt.%, pref. 0.05-5 wt.% of a nonionic surfactant such as a polyoxyethylene hardened castor oil, (C) 0.01-80 wt.%, pref. 0.1-50 wt.% of an oil agent such as liquid paraffin and (D) 0.2-10 wt.%, pref. 0.5-7 wt.% of an electrolyte such as pref. sodium lactate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-in-water emulsified cosmetic composition which exhibits sufficient effects of an electrolyte, has excellent stability over time, and has a good feeling in use.

[0002]

2. Description of the Related Art Conventionally, various kinds of electrolytes such as organic acid salts and inorganic acid salts have been blended in cosmetics for the purpose of imparting effects such as moisturizing, astringent, and dissolving keratin on the skin.

[0003]

However, when these electrolytes are incorporated into an oil-in-water emulsion cosmetic, there is a problem that the stability of the emulsified system is significantly impaired, such as aggregation and creaming of the emulsion and separation. Was. Therefore, in the oil-in-water type emulsified cosmetic, only a small amount of electrolyte can be blended in order to secure stability over time,
There was a limit to the effect to be manifested. In addition, water-soluble polymers that are relatively resistant to electrolytes, for example, solidifying the outer phase using xanthan gum or the like, or stabilizing over time by means of imparting structural viscosity by adding a large amount of higher alcohols or waxes, etc. Attempts have been made to improve
These methods have not been able to sufficiently satisfy the feeling of use, such as increased elongation and stickiness when applied to the skin. Therefore, development of an oil-in-water emulsified cosmetic which has excellent stability over time even when an electrolyte is blended and has a good feeling in use has been desired.

[0004]

Means for Solving the Problems As a result of intensive studies on the above-mentioned situation, the present inventors have found that in oil-in-water type emulsified cosmetics containing an electrolyte, N-alkylmethyltaurine salt is used as an emulsifier. In order to complete the present invention, it was found that an oil-in-water type emulsified cosmetic with less restriction on the touch surface and excellent in aging stability was obtained while blending an amount of electrolyte to obtain a sufficient effect. Reached.

That is, the present invention provides the following components (a) to
(D); (a) N-alkylmethyltaurine salt 0.05 to 5% by weight (b) Nonionic surfactant 0.01 to 10% by weight (c) Oil agent 0.01 to 80% by weight (d) The present invention relates to an oil-in-water emulsion cosmetic containing 0.2 to 10% by weight of an electrolyte. Further, the present invention relates to the above oil-in-water emulsified cosmetic wherein the component (d) is sodium lactate or sodium pyrrolidone carboxylate. Hereinafter, the present invention will be described in detail.

The N-alkylmethyltaurine salt of the component (a) used in the oil-in-water emulsion cosmetic of the present invention includes:
Examples include coconut oil fatty acid sodium methyltaurine, sodium lauroylmethyltaurine, sodium myristoylmethyltaurine, sodium palmitoylmethyltaurine, sodium stearoylmethyltaurine and the like. In the present invention, one or more of these N-alkylmethyltaurine salts can be used in an appropriate combination. Particularly preferred is sodium stearoylmethyltaurine.

In the oil-in-water emulsion cosmetic of the present invention, the compounding amount of the N-alkylmethyltaurine salt of the component (a) is as follows:
The content is 0.05 to 5% by weight (hereinafter simply referred to as "%"), and more preferably 0.1 to 2%. If the amount of component (a) is less than 0.05%, the stability over time cannot be sufficiently ensured. Further, if the content exceeds 5%, the N-alkylmethyltaurine salt itself becomes sticky, which is not preferable in use feeling.

[0008] The nonionic surfactant of component (b) used in the oil-in-water emulsion cosmetic of the present invention is commonly used in cosmetics, such as sorbitan fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid. Ester, propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, sucrose fatty acid ester, polyoxyethylene alkyl ether, polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene sorbitan fatty acid ester, poly Oxyethylene sorbitol fatty acid ester,
Polyoxyethylene glycerin fatty acid ester, polyoxyethylene propylene glycol fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hardened castor oil, polyoxyethylene phytostanol ether, polyoxyethylene phytosterol ether, polyoxyethylene cholestanol ether, polyoxy Ethylene cholesteryl ether, polyoxyalkylene-modified organopolysiloxane, polyoxyalkylene
Examples thereof include an alkyl co-modified organopolysiloxane, alkanolamide, sugar ether, sugar amide, and the like, and one or more of these may be used in appropriate combination. Among these, sorbitan fatty acid esters, polyoxyethylene fatty acid esters, glycerin fatty acid esters, and polyoxyethylene hydrogenated castor oil are more preferable.

In the oil-in-water emulsified cosmetic of the present invention, the compounding amount of the nonionic surfactant of the component (b) is 0.01 to 1
0%, and more preferably 0.05 to 5%. If the amount of the component (b) is less than 0.01%, the stability over time cannot be sufficiently ensured. Further, if the content exceeds 10%, the nonionic surfactant itself becomes sticky, which is not preferable in terms of use feeling.

As the oil agent of the component (c) used in the oil-in-water type emulsified cosmetic of the present invention, those used in ordinary cosmetics, and any of solid, semi-solid and liquid oils can be used. For example, natural animal and vegetable oils and fats, and semi-synthetic oils and fats, such as avocado oil, linseed oil, almond oil, ibotarou, eno oil, olive oil, cocoa butter,
Kapok wax, kaya oil, carnauba wax, liver oil, candelilla wax, tallow, beef tallow, beef bone fat, hardened tallow, kyonin oil, spermaceti, hardened oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, sugarcane wax , Sasanqua oil, safflower oil, shea butter, cinnamon oil, cinnamon oil, jojoba wax, shellac wax, turtle oil, soybean oil, teaseed oil, camellia oil, evening primrose oil, corn oil, lard, rapeseed oil, Japanese kiri oil , Bran wax, germ oil, horse fat, persic oil, palm oil, palm kernel oil, castor oil, hydrogenated castor oil, castor oil fatty acid methyl ester, sunflower oil, grape oil, bayberry wax, jojoba oil, macadamia nut oil, beeswax, mink oil , Cottonseed oil, cotton wax, mole,
Mokuro kernel oil, montan wax, coconut oil, hydrogenated coconut oil, tricoconut oil fatty acid glyceride, sheep fat, peanut oil, lanolin, liquid lanolin, reduced lanolin, lanolin alcohol, hard lanolin, lanolin acetate, lanolin fatty acid isopropyl, POE lanolin alcohol ether, POE
Lanolin alcohol acetate, lanolin fatty acid polyethylene glycol, POE hydrogenated lanolin alcohol ether, egg yolk oil and the like; hydrocarbon oils such as ozokerite, squalane, squalene, ceresin, paraffin,
Paraffin wax, liquid paraffin, pristane, polyisobutylene, microcrystalline wax, petrolatum, etc .; as higher fatty acids, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecylenic acid, oleic acid, linoleic acid, linolenic acid, Arachidonic acid, eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), isostearic acid, 12-hydroxystearic acid and the like; as higher alcohols, lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, behenyl alcohol,
Hexadecyl alcohol, oleyl alcohol, isostearyl alcohol, hexyl decanol, octyl dodecanol, cetostearyl alcohol, 2-decyltetradecinol, cholesterol, phytosterol, POE cholesterol ether, monostearyl glycerin ether (bacyl alcohol), etc .; ester oil Examples thereof include diisobutyl adipate, 2-hexyldecyl adipate, di-2-heptylundecyl adipate, N-alkyl glycol monoisostearate, isocetyl isostearate, trimethylolpropane triisostearate, and di-2-ethylhexanoic acid Ethylene glycol, cetyl 2-ethylhexanoate, tri-2
-Trimethylolpropane ethylhexanoate, tetra-
Pentaerythritol 2-ethylhexanoate, cetyl octanoate, octyldodecyl gum ester, oleyl oleate, octyldodecyl oleate, decyl oleate, neopentyl glycol dicaprate, triethyl citrate, 2-ethylhexyl succinate, amyl acetate, acetic acid Ethyl, butyl acetate, isocetyl stearate, butyl stearate, diisopropyl sebacate,
Di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, isopropyl palmitate, 2-ethylhexyl palmitate, 2-hexyldecyl palmitate, 2-heptylundecyl palmitate, cholesteryl 12-hydroxystearylate, dipentaerythritol fatty acid Esters, isopropyl myristate, octyldodecyl myristate, 2-hexyldecyl myristate, myristyl myristate, hexyldecyl dimethyloctanoate, ethyl laurate, hexyl laurate, N-lauroyl-L-glutamic acid-2-octyldodecyl ester, Diisostearyl malate and the like; glyceride oils include acetoglyceride, triisooctanoic acid glyceride, triisostearate glyceride, triisopal Chin acid glyceride, tri-2
Ethylhexanoic acid glyceride, monostearic acid glyceride, di-2-heptylundecanoic acid glyceride, trimyristate glyceride and the like; silicone oils include dimethylpolysiloxane, methylphenylpolysiloxane, methylhydrogenpolysiloxane, octamethylcyclotetrasiloxane , Decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, tetramethyltetrahydrogencyclotetrasiloxane, higher alkoxy-modified silicones such as stearosilicone, higher fatty acid-modified silicones, silicone resins, silicone rubber, silicone resins, etc .; Examples thereof include perfluoropolyether, perfluorodecalin, perfluorooctane, and the like. It can be used singly or in combination.

[0011] In the oil-in-water emulsified cosmetic composition of the present invention, the blending amount of the oil agent of the component (c) is 0.01 to 80%, more preferably 0.1 to 50%. If the blending amount of the component (c) is less than 0.01%, it is not preferable in feel, and if it is more than 80%, the oil itself has a sticky feeling and is not preferable in feel.

The electrolyte of component (d) used in the oil-in-water emulsion cosmetic of the present invention is used for ordinary cosmetics, and includes organic acid salts and / or inorganic acid salts. Is a sodium salt, a calcium salt, a magnesium salt and the like. Specifically, for example, sodium chloride, calcium chloride, magnesium chloride, sodium citrate,
Sodium lactate, calcium lactate, sodium succinate, sodium malate, sodium pyrrolidone carboxylate, zinc sulfocarbonate, potassium aluminum sulfate (alum), and the like. Depending on the purpose, one or more of these may be appropriately selected. Can be used. Among these, more preferred are sodium lactate and sodium pyrrolidonecarboxylate.

The compounding amount of the electrolyte of the component (d) in the oil-in-water emulsion cosmetic of the present invention is 0.2 to 10%, more preferably 0.5 to 7%. When the amount of component (d) is less than 0.2%, the effect of the electrolyte cannot be sufficiently exhibited. If the content exceeds 10%, it is difficult to obtain good temporal stability even though the essential components described above are added.

In the oil-in-water emulsion cosmetic of the present invention,
For example, the above essential components are blended in an emulsifying base such as water, but components used in ordinary cosmetics such as gelling agents, powders, alcohols, water-soluble polymers, oil-soluble polymers , Film-forming agents, resins, ultraviolet absorbers, humectants, preservatives, antibacterial agents, fragrances, salts, antioxidants, PH regulators, chelating agents, fresheners, anti-inflammatory agents, and components for beautiful skin (whitening agents, cells Activators, skin roughness improving agents, blood circulation promoters, skin astringents, antiseborrheic agents, etc.), vitamins, amino acids, nucleic acids, hormones, clathrates, etc., in a range that does not impair the effects of the present invention. Can be.

The oil-in-water emulsified cosmetic of the present invention includes a lotion, an emulsion, a cream, a serum, a pack and the like.

[0016]

EXAMPLES The present invention will be further described with reference to the following examples, but the present invention is not limited thereto.

Examples 1-5 and Comparative Examples 1-6: Cream Creams having the compositions shown in Tables 1 and 2 below were prepared.
Evaluation items for (1) stability over time, (2) feeling of use, and (3) moisturizing effect were evaluated by the following methods.

[0018]

[Table 1]

[0019]

[Table 2]

(Production method) A: Components 1 to 5 are mixed and uniformly heated and dissolved. B. Components 6 to 8, 10, and 12 are mixed and uniformly heated and dissolved. C. Add A to B and emulsify. D. Cool C. E. FIG. Components 9 and 11 were added to D and mixed to obtain a cream.

(Evaluation method) Stability over time The obtained cream was set in a thermostat at 40 ° C. for one month, and the presence or absence of appearance change such as separation was visually observed. [Evaluation] A: No change in appearance is observed. ：: Almost no change in appearance was observed. Δ: Change in appearance such as separation is observed. X: Appearance change such as separation is remarkably observed.

2. Feeling of Use A panel of 10 professional evaluation panels evaluated the feeling of use (good spreadability and no stickiness) when applied to the skin according to the following criteria.
It was evaluated on a scale and judged from the average score. [Evaluation] 5 points: Very good. 4 points: good. 3 points: Normal. 2 points: bad. 1 point: very bad. [Judgment] ：: Average score of 4.5 or more ○: Average score of 3.5 or more and less than 4.5 Δ: Average score of 2.5 or more and less than 3.5 ×: Average score of less than 2.5

3. Moisturizing effect The moisturizing effect was evaluated on a 5-point scale according to the following criteria by 10 professional evaluation panels, and the average score was determined. [Evaluation] 5 points: Very good. 4 points: good. 3 points: Normal. 2 points: bad. 1 point: very bad. [Determination] ◎: Average score of 4.5 or more ○: Average score of 3.5 or more and less than 4.5 Δ: Average score of 2.5 or more and less than 3.5 ×: Average score of less than 2.5 The results obtained are shown in Tables 1 and 2.

As is clear from the results in Tables 1 and 2, the creams of Examples 1 to 5 of the product of the present invention have better stability over time and better use than the creams of Comparative Examples 1 to 6. It had a feeling and was excellent in a moisturizing effect.

Example 6 Emulsion (Component) (%) 1. N-stearoyl methyl taurine sodium 1.0 2. Sorbitan sesquioleate 0.5 3. Polyoxyethylene monooleate (20) sorbitan 0.5 Behenyl alcohol 1.05. Squalane 3.0 6. 6. Tri (caprylic / capric) glyceryl 3.0 Vaseline 1.0 8. Dipropylene glycol 10.0 9. Purified water balance 10. Methylcellulose 0.1 11. Sodium pyrrolidonecarboxylate 3.0 12. Preservative appropriate amount 13. Ethanol 5.0 14. Silicic anhydride 1.0 15. Appropriate amount of fragrance

(Production method) A: Components 2 to 7 are heated and uniformly mixed and dissolved. B: Components 1, 8 to 10 are heated and uniformly mixed and dissolved. C: Add A to B and emulsify. D: Cool C. E: Components 11 to 15 were added to D and mixed to obtain an emulsion. The emulsion obtained as described above was excellent in stability over time, while incorporating an amount of electrolyte capable of obtaining a sufficient effect.

Example 7 Cream Pack (Ingredient) (%) 1. N-palmitoylmethyltaurine sodium 1.5 2. 2. Glycerin monostearate 1.0 3. Polyoxyethylene monooleate (20) sorbitan 1.0 Cetanol 3.0 5. Liquid paraffin 30.0 6. Macadamia nut oil 10.0 7. Vaseline 3.0 8. Pentaerythrit fatty acid ester 2.09. Glycerin 10.0 10.1, 3-butylene glycol 10.0 11. Purified water balance 12. 12. sodium pyrrolidonecarboxylate 2.0 Sodium lactate 3.0 14. Preservative appropriate amount 15. Appropriate amount of fragrance

(Manufacturing method) A: Components 2 to 8 are heated and uniformly mixed and dissolved. B: Components 1, 9 to 11 are heated and uniformly mixed and dissolved. C: Add A to B and emulsify. D: Cool C. E: Components 12 to 15 were added to and mixed with D to obtain a cream pack. The cream pack obtained as described above was excellent in stability over time while blending an amount of electrolyte capable of obtaining a sufficient effect.

Example 8 Serum (Component) (%) 1. N-stearoylmethyltaurine sodium 0.05 2. 2. N-palmitoylmethyltaurine sodium 0.05 Polyoxyethylene (40EO) hydrogenated castor oil 0.24. Cetanol 0.4 5.2 Cetyl ethylhexanoate 1.0 6. Dimethyl polysiloxane 1.0 7. Glycerin 3.0 8.1 1,3-butylene glycol 10.0 9. Purified water balance 10. Hydroxyethyl methylcellulose 0.111. Sodium pyrrolidonecarboxylate 1.012. Sodium lactate 1.0 13. Preservative appropriate amount 14. Appropriate amount of fragrance

(Manufacturing method) A: Components 3 to 6 are heated and uniformly mixed and dissolved. B: Components 1-2 and 7-10 are heated and uniformly mixed and dissolved. C: Add A to B and emulsify. D: Cool C. E: Components 11 to 14 were added to D and mixed to obtain a serum. The essence obtained as described above was excellent in stability over time while blending an amount of electrolyte to obtain a sufficient effect.

Example 9 Lotion (Component) (%) 1. Polyoxyethylene (30) cholestanol ether 1.0 N-stearoylmethyltaurine sodium 0.2 3.1,3-butylene glycol 5.0 4.0. Glycerin 5.0 5. Squalane 0.16. Vitamin E acetate 0.17. Appropriate amount of flavor 8. Purified water balance 9. Sodium lactate 3.0 10. Preservative appropriate amount

(Production method) A: Components 1 to 7 are heated and uniformly mixed and dissolved. B: Component 8 is heated. C: B is added to A and emulsified. D: Cool C. E: Components 9 to 10 were added to and mixed with D to obtain a lotion. The lotion obtained as described above was excellent in stability over time while blending an amount of electrolyte capable of obtaining a sufficient effect.

[0033]

As described in detail above, the oil-in-water emulsified cosmetic of the present invention is excellent in stability over time and has a good feeling in use while sufficiently exhibiting the effect of the electrolyte.

Claims (2)

[Claims] 1. The following components (a) to (d): (a) 0.05 to 5% by weight of an N-alkylmethyltaurine salt (b) 0.01 to 10% by weight of a nonionic surfactant (c) ) Oil-in-water type emulsified cosmetic comprising 0.01 to 80% by weight of an oil agent (d) 0.2 to 10% by weight of an electrolyte. 2. The oil-in-water emulsion cosmetic according to claim 1, wherein the component (d) is sodium lactate or sodium pyrrolidonecarboxylate.