JP2016030728A - Oil-in-water emulsified composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-in-water emulsified composition which exhibits storage stability, particularly excellent storage stability in a sudden temperature change.SOLUTION: This invention relates to an oil-in-water emulsified composition obtained by emulsifying an aqueous phase comprising an emulsifier and a higher alcohol, and an oil phase comprising a polysaccharide fatty acid ester. This invention particularly relates to an oil-in-water emulsified composition comprising, in the oil phase, at least one selected from the group consisting of p-methoxycinnamic acid octyl, diethylamino hydroxybenzoyl benzoic acid hexyl, dimethoxybenzylidene dioxo imidazolidine propionic acid octyl, and t-butylmethoxybenzoyl methane.SELECTED DRAWING: None

Description

  The present invention relates to an oil-in-water emulsion composition.

A low-viscosity oil-in-water emulsified composition having a viscosity of 10,000 Pa · s or less is characterized by a fresh and light touch, but is known to be difficult to maintain stability. In particular, when an ultraviolet absorber or a powder intended to scatter ultraviolet rays, such as a sunscreen preparation, is blended in the inner oil phase, the emulsion is often seen to coalesce and separate over time or cause a creaming phenomenon. In order to cope with these phenomena, it is necessary to increase the viscosity to some extent. However, in that case, there is a problem that the fresh and light usability is remarkably impaired.

Further, UV protection cosmetics are products that are expected to be consumed from spring to summer. For this reason, UV protection cosmetics are mainly produced before spring and in winter. However, in the Japanese environment, it is often exposed to a harsh environment at the time of storage and transportation in a warehouse after manufacture, and there are cases where it is stored and transported in an environment close to 0 ° C. especially in winter. In addition, the main use is from spring to summer, and it can be easily guessed that customers are exposed to high-temperature environments during storage and transportation.
Therefore, it is necessary to combine the stability at low temperature and the stability at high temperature particularly in the ultraviolet protective cosmetic. However, in the stability observation in conventional UV protection cosmetics, high temperature conditions such as 40 ° C. for 2 weeks (Patent Document 1: Japanese Patent Laid-Open No. 2001-192318), 50 ° C. (Patent Document 2: Japanese Patent Laid-Open No. 11-76799), etc. The test is mainly performed only under low temperature conditions at 5 ° C. (Patent Document 3: Japanese Patent Laid-Open No. 2011-207789), and it cannot be said that confirmation of stability in a cycle of repeating low and high temperatures is sufficient. It was a situation.

JP 2001-192318 A JP-A-11-76799 JP 2011-207789 A

It is an object of the present invention to provide an oil-in-water emulsion composition having a low viscosity of 10,000 Pa · s or less and exhibiting storage stability, in particular, good storage stability against a rapid temperature change.

  Provided is an oil-in-water emulsion composition obtained by emulsifying an aqueous phase containing an emulsifier and a higher alcohol and an oil phase containing a polysaccharide fatty acid ester. The present invention particularly provides a low-viscosity oil-in-water emulsion composition having a viscosity of 10,000 Pa · s or less.

  The oil-in-water emulsion composition of the present invention exhibits the effect that the storage stability is good.

  Hereinafter, modes for carrying out the present invention will be described.

  The oil-in-water emulsified composition of the present invention is obtained by emulsifying an aqueous phase containing an emulsifier and a higher alcohol and an oil phase containing a polysaccharide fatty acid ester.

  The emulsifier to be blended in the oil-in-water emulsion composition of the present invention is not particularly limited as long as it is an emulsifier that can be usually used. A nonionic surfactant is preferably used as the emulsifier, and an ester type or ether ester type nonionic surfactant is more preferable. Specifically, polyoxyethylene glycerin fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol fatty acid esters, polyoxyethylene fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters And sucrose fatty acid esters.

Examples of polyoxyethylene glycerin fatty acid esters include polyoxyethylene (5) glyceryl monooleate, polyoxyethylene (10) glyceryl monooleate, polyoxyethylene (15) glyceryl monooleate, polyoxyethylene ( Examples thereof include 20) glyceryl monooleate, polyoxyethylene (5) glyceryl monostearate, polyoxyethylene (10) glyceryl monostearate, polyoxyethylene (15) glyceryl monostearate.

Examples of the polyoxyethylene sorbitan fatty acid esters include polyoxyethylene (2) sorbitan monolaurate, polyoxyethylene (20) sorbitan monopalmitate, polyoxyethylene (20) sorbitan monostearate, polyoxyethylene (20 ) Sorbitan tristearate, polyoxyethylene (6) sorbitan monostearate, polyoxyethylene (20) sorbitan monooleate, polyoxyethylene (20) sorbitan trioleate, polyoxyethylene (6) sorbitan Examples include monooleate, polyoxyethylene (60) sorbitan monooleate, polyoxyethylene (20) sorbitan monoisostearate It is.

Examples of polyoxyethylene sorbitol fatty acid esters include polyoxyethylene (20) sorbitol monolaurate, polyoxyethylene (6) sorbitol monopalmitate, polyoxyethylene (6) sorbitol hexastearate, polyoxyethylene (6 ) Sorbitol tetraoleate, polyoxyethylene (60) sorbitol tetraoleate and the like.

Examples of polyoxyethylene fatty acid esters include polyoxyethylene (6) monolaurate, polyoxyethylene (10) monolaurate, polyoxyethylene (30) monolaurate, polyoxyethylene (1) monostearate , Polyoxyethylene (2).) Monostearate, polyoxyethylene (4) monostearate, polyoxyethylene (10) monostearate, polyoxyethylene (25) monostearate, polyoxyethylene (40) monostearic acid ester, polyoxyethylene (45) monostearic acid ester, polyoxyethylene (55) monostearic acid ester, polyoxyethylene (2) monooleic acid ester, polyoxyethylene Emissions (6) monooleate, polyoxyethylene (10) monooleate and the like.

Examples of glycerin fatty acid esters include glycerin coconut oil fatty acid ester, glyceryl monomyristic acid ester, glyceryl monopalmitic acid ester, glyceryl monostearic acid ester, glyceryl monoisostearic acid ester, glyceryl monooleic acid ester, glycerin castor oil fatty acid ester, glycerin Examples include hardened castor oil fatty acid esters.

Polyglycerol fatty acid esters include diglycerol monolaurate, diglycerol monomyristic ester, diglycerol monopalmitate, diglycerol monostearate, diglycerol monoisostearate, diglycerol monooleate, hexa Glycerol monolaurate, hexaglycerol monomyristate, hexaglycerol monopalmitate, hexaglycerol monostearate, hexaglycerol monoisostearate, hexaglycerol monooleate, decaglycerol monolaurate, decaglycerol monomyristine Acid ester, decaglycerol monopalmitate, decaglycerol monostearate Esters, decaglycerol monoisostearate esters, decaglycerol monooleate and the like.

Sorbitan fatty acid esters include sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquistearate, sorbitan tristearate, sorbitan monoisostearate, sorbitan sesquiisostearate, sorbitan monoester Examples include oleate, sorbitan sesquioleate, sorbitan trioleate, and the like.

  Examples of the sucrose fatty acid ester include sucrose lauric acid monoester, sucrose myristic acid monoester, sucrose palmitic acid monoester, sucrose stearic acid monoester, sucrose oleic acid monoester, and the like.

  The emulsifier used for the oil-in-water type emulsion composition of this invention is mix | blended individually by 1 type or in combination of 2 or more types. In the oil-in-water emulsion composition of the present invention, it is preferable to use two or more emulsifiers having different hydrophilic and hydrophobic properties in combination from the viewpoint of emulsion stability.

  The blending amount of the emulsifier varies depending on the blending amount of the oil phase used in combination, and is 0.02 to 1 part by mass with respect to the oil phase 1 in mass ratio. When the amount is less than 0.02 parts by mass, a stable emulsion composition may not be obtained.

  The higher alcohol blended in the oil-in-water emulsion composition of the present invention is a monohydric alcohol having 8 to 30 carbon atoms, which is a linear or branched, saturated or unsaturated hydrocarbon, and is used alone. Or in combination of two or more. Specifically, caprylyl alcohol, capryl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, hexyl decanol, stearyl alcohol, isostearyl alcohol, oleyl alcohol, octyldodecanol, aralkyl alcohol, behenyl alcohol, carnervir alcohol, ceryl alcohol, etc. Is exemplified. Among these higher alcohols, one or more selected from cetyl alcohol, stearyl alcohol, aralkyl alcohol, and behenyl alcohol are preferably used, and behenyl alcohol is most preferable from the viewpoint of emulsion stability.

  The blending amount of the higher alcohol in the oil-in-water emulsion composition varies depending on the blending amounts of the emulsifier and ester compound used in combination, but 0.3 to 5% by mass is appropriate based on the total amount of the oil-in-water emulsion composition. If it is less than 0.3% by mass, the stability of the oil-in-water emulsion composition may not be maintained. Even if it exceeds 5 mass%, further improvement of stability improvement effect is not recognized, and it is inefficient.

  It does not specifically limit as polysaccharide fatty acid ester mix | blended with the oil-in-water type emulsion composition of this invention, 1 type is used individually or in combination of 2 or more types. Examples of such polysaccharide fatty acid esters include dextrin octoate, dextrin laurate, dextrin palmitate, dextrin myristate, dextrin stearate, inulin octoate, inulin laurate, inulin palmitate, inulin myristate, inulin stearate and the like. The

  The blending amount of the polysaccharide fatty acid ester in the oil-in-water emulsion composition varies depending on the blending amount of the oil phase component and the like, but is suitably 0.1 to 3% by mass with respect to the total amount of the oil-in-water emulsion composition. If it is less than 0.1% by mass, stability may not be maintained.

As the oil phase component of the oil-in-water emulsion composition of the present invention, it is preferable to blend hydrocarbon oil and ester oil.
The kind of hydrocarbon oil used in the present invention is not particularly limited as long as it can be usually blended in an oil-in-water emulsion composition, and examples include α-olefin oligomers, squalane, liquid isoparaffin, liquid paraffin, and the like. One kind of hydrocarbon oil can be used alone or in combination of two or more kinds.

  The ester oil used in the present invention refers to a liquid oily component obtained by a dehydration reaction between a fatty acid and an alcohol. The type of the ester oil is not particularly limited as long as it can be blended in an oil-in-water emulsion composition. 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 myristate, isostearyl myristate, octyldodecyl myristate, 2-ethylhexyl palmitate, Isocetyl palmitate, isostearyl palmitate, 2-ethylhexyl stearate, isocetyl stearate, isodecyl oleate, octyldodecyl oleate, octyldodecyl ricinoleate , Ethyl isostearate, isopropyl isostearate, cetyl 2-ethylhexanoate, cetostearyl 2-ethylhexanoate, hexyl isostearate, ethylene glycol dioctanoate, ethylene glycol dioleate, propylene glycol dicaprylate, di (capryl-caprin) Acid) propylene glycol, propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol dicaprate, neopentyl glycol dioctanoate, glyceryl tricaprylate, glyceryl tri-2-ethylhexanoate, glyceryl tri (capryl-caprate), tri Glyceryl isopalmitate, glyceryl triisostearate, trimethylolpropane tri-2-ethylhexanoate, triisostearin Trimethylolpropane, pentaerythritol tetra-2-ethylhexanoate, pentaerythritol tetraisostearate, octyldodecyl neopentanoate, isocetyl octoate, isostearyl octoate, 2-ethylhexyl isoperargonate, hexyldecyl dimethyloctanoate, dimethyloctanoic acid Octyldodecyl, 2-ethylhexyl isopalmitate, isocetyl isostearate, isostearyl isostearate, octyldodecyl isostearate, lauryl lactate, myristyl lactate, cetyl lactate, octyldodecyl lactate, triethyl citrate, acetyl triethyl citrate, acetyl tributyl citrate , Trioctyl citrate, triisocetyl citrate, trioctyldodecyl citrate, di-2-ethyl succinate Ruhexyl, isopropyl adipate, isobutyl adipate, dioctyl adipate, diethyl sebacate, diisopropyl sebacate, dioctyl sebacate, avocado oil, almond oil, olive oil, sesame oil, rice bran oil, safflower oil, soybean oil, corn oil, rapeseed Oil, persic oil, palm kernel oil, palm oil, castor oil, sunflower oil, grape seed oil, cotton seed oil, palm oil, meadowweed oil, jojoba oil, kukui nut oil, wheat germ oil, rice germ oil, evening primrose oil, Macadamia nut oil and the like are exemplified, and one of these ester oils can be used alone or in combination of two or more.

    By blending an oil-soluble ultraviolet absorber as the oil phase component of the oil-in-water emulsion composition of the present invention, it can be used as an external preparation for ultraviolet protection.

Such an oil-soluble ultraviolet absorber is not particularly limited as long as it can be used for a skin external preparation, and examples thereof include a paraaminobenzoic acid derivative, a cinnamic acid derivative, a benzophenone derivative, and a salicylic acid derivative. Preferably, one or two kinds selected from octyl paramethoxycinnamate which is liquid at room temperature, hexyl diethylaminohydroxybenzoyl benzoate, dimethoxybenzylidene dioxoimidazolidine propionate and t-butylmethoxybenzoylmethane which are solid at room temperature The above is preferably used in combination, and more preferably, octyl p-methoxymethoxycinnamate and hexyl diethylaminohydroxybenzoyl benzoate are used in combination.

  The oil-in-water emulsion composition of the present invention preferably contains an acrylic acid-based water-soluble polymer for the purpose of adjusting the viscosity and feeling of use of the emulsion composition. Such an acrylic acid-based water-soluble polymer has an acrylic group structure and is not particularly limited. For example, polyacrylic acid and salts thereof, carbomer, (acrylates / alkyl acrylate (C10-30)) crosspolymer, acrylamide / acrylamide-2-methylpropanesulfonate copolymer, hydroxyethyl acrylate / acryloyldimethyltaurine salt Copolymer, acrylate / acryloyldimethyltaurine copolymer, acrylic acid amide / acrylic acid-2-methylpropanesulfonate copolymer, acryloyldimethyltaurate / vinylpyrrolidone copolymer, etc. Are used alone or in combination of two or more.

  Of these, one or two selected from (acrylates / alkyl acrylate (C10-30)) crosspolymer and acrylamide / acrylamide-2-methylpropanesulfonate copolymer are preferably used, and more preferably. Is preferably used in combination with an (acrylates / alkyl acrylate (C10-30)) crosspolymer and an acrylamide-acrylamide-2-methylpropanesulfonate copolymer.

In the oil-in-water emulsion composition of the present invention, the mixing ratio of the water phase and the oil phase is preferably a mass ratio, and the oil phase is preferably in the range of 0.1 to 1 with respect to the water phase 1. When the oil phase is less than 0.1 with respect to the aqueous phase, the stability may decrease. Moreover, when an oil phase is mix | blended exceeding 1, emulsification may become difficult.

  The oil phase used in the oil-in-water emulsion composition of the present invention preferably contains no surfactant. When a surfactant is mixed in the oil phase, a fine emulsion may not be obtained or stability over time may become unstable.

  The oil-in-water emulsified composition of the present invention is obtained by emulsifying an aqueous phase containing an emulsifier and a higher alcohol and an oil phase containing a polysaccharide fatty acid ester. First, an aqueous phase containing an emulsifier and a higher alcohol is heated above the melting point of the higher alcohol and dispersed uniformly. On the other hand, the oil phase containing the polysaccharide fatty acid ester is heated to a high temperature and uniformly dissolved. A stable oil-in-water emulsion composition can be obtained by adding an oil phase to an aqueous phase in a high temperature state and uniformly emulsifying and then cooling.

  The oil-in-water emulsion composition of the present invention can be emulsified using a normal homogenizer and a disper without using a special emulsifier such as a colloid mill or a high-pressure homogenizer.

Furthermore, by adding an aqueous component to the obtained oil-in-water emulsion composition and diluting it, an oil-in-water emulsion composition having a low viscosity of 10000 mPa · s or less and good stability over time can be obtained.

  The oil-in-water emulsion composition of the present invention having a low viscosity of 10000 mPa · s or less and good stability over time can adjust a fine emulsion having an average particle diameter of 350 nm or less.

  For the viscosity, the emulsion composition stored at 25 ° C. was measured using a B-type viscometer, rotor No. The viscosity measured under the conditions of 2 and 6 rpm.

  In the oil-in-water emulsion composition of the present invention, in addition to the above-mentioned essential and optional components, an aqueous component, a humectant, a dye, a surfactant, and an ultraviolet absorber, which are usually blended into the emulsion composition as necessary. Agents, thickeners, cosmetic ingredients, fragrances, polymer substances, antibacterial and antifungal agents, alcohols, powders, scrub agents, biogenic ingredients, and the like can be appropriately blended.

  The oil-in-water emulsion composition of the present invention can be used, for example, in the form of a lotion, emulsion, or ointment.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the scope of the present invention is not limited thereby. The blending amount is mass% unless otherwise specified.

  First, the evaluation method of the prepared oil-in-water emulsion composition is demonstrated.

[Stability]
The prepared oil-in-water emulsion composition was filled in a mayonnaise bottle and allowed to stand for 6 months in a cycle thermostatic bath at −5 ° C. for 24 hours and 40 ° C. for 24 hours, and then the state was observed.
“○” indicates a uniform emulsified state
Somewhat slightly separated
`` × '' indicates what is separated
Each was evaluated.

[Measurement of viscosity]
The viscosity of the prepared oil-in-water emulsion composition was stored at 25 ° C. The measurement was performed at 2 and 6 rpm.

An oil-in-water emulsion composition was prepared according to the formulation shown in Table 1. The preparation method is as follows.
(A) 2-7 water phase components and 8-12 oil phase components were heated, dissolved and homogenized, respectively.
(B) The oil phase was added to the aqueous phase and emulsified by treating with a homogenizer for 2 minutes.
(C) After cooling to 40 ° C., 1 purified water was added.

  As shown in Table 1, in the examples of the present invention, the average particle size was 2.5 μm, a fine emulsion was obtained, and the storage stability was also good. On the other hand. Both Comparative Example 1 in which a higher alcohol was added to the oil phase and Comparative Example 2 in which the polysaccharide fatty acid ester was replaced with a hydrocarbon wax had poor stability over time and a creaming phenomenon was observed.

  Other examples and comparative examples were prepared with the components described in Tables 2 to 4, and the stability and average particle diameter were measured. In addition, the preparation method was prepared according to the above.

Claims (3)

  An oil-in-water emulsion composition obtained by emulsifying an aqueous phase containing an emulsifier and a higher alcohol and an oil phase containing a polysaccharide fatty acid ester.   A low-viscosity oil-in-water emulsion composition having a viscosity of 10,000 mPa · s or less, obtained by diluting the oil-in-water emulsion composition obtained in claim 1 to 1 to 10 times by mass using an aqueous component.   1 or 2 types selected from the group consisting of octyl paramethoxycinnamate, hexyl diethylaminohydroxybenzoyl benzoate, dimethoxybenzylidenedioxoimidazolidinepropionate, and t-butylmethoxybenzoylmethane. The oil-in-water emulsion composition according to claim 2.