JPH11244688A - Oil in water emulsion composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an oil in water emulsion composition superior in safety, long stability and feeling in use. SOLUTION: This composition is formed by emulsifying a water phase (an outer phase) and an oil phase (an inner phase). In this case, the composition is incorporated with (a) α-monoalkylglyceryl ether, (b) waxes, (c) >=10 wt.% silicone oil in the oil phase (but excluding the α-monoalkylglyceryl ether and waxes), and (d) 0.5-20 wt.% spherical powder in the total composition, and it is not substantially incorporated with a surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an oil-in-water emulsion composition. More specifically, the present invention relates to an oil-in-water emulsion composition which is excellent in safety, long-term stability, and feel upon use.

[0002]

2. Description of the Related Art In order to obtain an oil-in-water emulsion composition by emulsifying an aqueous phase (outer phase) and an oil phase (inner phase), nonionic surfactants and anionic surfactants are generally used as emulsifiers. Any one selected from an agent or an amphoteric surfactant
More than one surfactant has been used. However, even though these surfactants have excellent emulsifying power, their safety on the skin is not always sufficiently high. In recent years, further safety has been desired for cosmetics, and from such a viewpoint, the blending of a surfactant may be problematic. Therefore, a method of obtaining an oil-in-water emulsion composition using cyclodextrin and a water-soluble polymer without using a surfactant has been proposed (Japanese Patent Publication No. 2-3).
No. 8253, JP-B-62-31681, JP-B-61-38166, etc.).

[0003]

However, the oil-in-water emulsion composition obtained by the above-mentioned method has not yet been sufficiently satisfactory in long-term stability and usability.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an oil-in-water emulsion composition which is particularly excellent in safety, long-term stability, and feel during use.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventor has found that α-monoalkylglyceryl ether, waxes and a predetermined amount or more of silicone oil are contained in the oil phase. The oil-in-water emulsified composition having excellent safety, long-term stability and use feeling without substantially containing a surfactant by further containing a specific amount of spherical powder in the composition. They have found that they can be obtained, and have completed the present invention.

That is, the present invention provides an oil-in-water emulsion composition obtained by emulsifying an aqueous phase (outer phase) and an oil phase (inner phase), wherein the composition comprises (a) an α-monoalkylglyceryl ether; b) 10% by weight or more of wax and (c) silicone oil in the oil phase (excluding α-monoalkylglyceryl ether and wax), and (d) spherical powder in an amount of 0% in the total amount of the composition. The present invention relates to an oil-in-water emulsified composition containing from 0.5 to 20% by weight and containing substantially no surfactant.

In the above, it is preferable to further contain (e) a higher alcohol.

It is preferable that the composition further contains (f) a water-soluble polymer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

[0010] α as the component (a) used in the present invention
As the monoalkyl glyceryl ether, a linear or branched alkyl group having 8 to 24 carbon atoms is preferably used, and specific examples thereof include batyl alcohol (= octadecyl glyceryl ether) and chimyl alcohol (= 1-hexadecyl). Glyceryl ether) and the like. Among them, straight-chain alkyl groups having 8 to 24 carbon atoms are preferred, and batyl alcohol is particularly preferred.

The α-monoalkyl glyceryl ether is
One or two or more can be selected and used.

In the present invention, the α-monoalkyl glyceryl ether acts as an emulsifier. Generally, α-monoalkyl glyceryl ether has low surface activity and is rarely used alone as an emulsifier for obtaining an oil-in-water emulsion composition. Therefore, it is generally used not substantially as a surfactant but as a stabilizer for use in emulsification and as a use improver.

The present inventors have paid particular attention to the structure of α-monoalkyl glyceryl ether, and have found that the α-monoalkyl glyceryl ether can sufficiently function as an emulsifier under certain conditions. Under such conditions, it was found that an oil-in-water emulsified composition having excellent emulsifiability can be obtained without substantially adding a surfactant, leading to completion of the present invention. It is a thing.

The content of the α-monoalkyl glyceryl ether in the emulsifier composition of the present invention is preferably 0.2 to 15% by weight, more preferably 0.3 to 10% by weight.
If it is less than 0.2% by weight, it may be difficult to obtain sufficient emulsification stability, while if it exceeds 15% by weight, the improvement of the feeling upon use may be insufficient.

The waxes as component (b) include:
Animal and plant waxes, synthetic waxes and the like can be mentioned.

The animal and plant waxes include, for example, candelilla wax, carnauba wax, beeswax, wood wax, hard lanolin, cotton wax, Ibota wax, cholesterol, phytosterol, and derivatives thereof. In addition, hardened oils such as castor oil, soybean oil, avocado oil, olive oil, macadamia nut oil, corn oil, cottonseed oil, palm oil, camellia oil, and tallow are included.

Examples of the synthetic wax include “Synchronax Wax ERL-C” and “Synchron Wax IIR-C”.
C "(all manufactured by Croda Japan).

Among these waxes, it is preferable to use animal and plant waxes, and in particular, at least one selected from beeswax, candelilla wax, wood wax, cholesterol, phytosterol, and derivatives thereof is preferably used. .

One or more waxes can be selected and used.

The compounding amount of the wax is preferably 0.2 to 20% by weight, more preferably 0.3 to 15% by weight in the emulsifier composition of the present invention. If it is less than 0.2% by weight, the emulsion stability tends to be insufficient.
If the content is more than the weight percentage, the usability may be insufficiently improved.

As the silicone oil as the component (c), any of a linear structure and a cyclic structure may be used, and both volatile and non-volatile ones may be used. For example, the following general formulas (I) and (II)

[0022]

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(Wherein, R ^{1 to} R ⁸ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group; m represents an integer of 0 to 250)

[0024]

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Wherein R ⁹ and R ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms;
And a silicone oil represented by the following formula: Specifically, for example, dimethylpolysiloxane (viscosity: 6 cs, 100 cs), decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane,
Methylphenyl polysiloxane and the like are exemplified. Among them, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane and the like are preferably used.

One or more silicone oils can be selected and used. The amount of the silicone oil in the present invention is at least 10% by weight, preferably at least 15% by weight in the oil phase excluding the α-monoalkylglyceryl ether and waxes. If it is less than 10% by weight, good oil-in-water emulsification cannot be achieved.

As the spherical powder as the component (d), for example, spherical silica, spherical cellulose, spherical polyester,
Spherical polyethylene, alkyl polymethacrylate, methylsiloxane network polymer, polylauramide,
Examples include polymethylsilsesoxane powder, nylon powder, crosslinked polystyrene, silicone resin, silica powder, cellulose powder, polyethylene powder, and silicone rubber. In the present invention, silicon-based spherical powder is particularly preferred.

One or more spherical powders can be selected and used. The compounding amount of the spherical powder is 0.5 to 20% by weight in the emulsifier composition of the present invention, preferably 1 to 20% by weight.
１５15% by weight. If the amount is out of the above range, sufficient improvement in use feeling cannot be obtained.

In the present invention, a specific amount of (d) spherical powder is blended under the condition that (b) a wax and the above specific amount of (c) silicone oil are added together with (a) α-monoalkyl glyceryl ether. For the first time, it was possible to achieve good oil-in-water emulsification.

In this case, the components (a) to (c) can be used by adding them to the oil phase. In addition, these components (a) to (c) are uniformly mixed in advance,
This can be used as an oil-in-water emulsifier by mixing it with another oil phase and an aqueous phase.

In the present invention, it is preferable to further blend (e) a higher alcohol in order to further improve the oil-in-water emulsion stability. Examples of the higher alcohol used in the present invention include cetyl alcohol, stearyl alcohol, isostearyl alcohol, 2-octyldodecanol, and behenyl alcohol.

One or more higher alcohols can be selected and used.

The blending amount of the higher alcohol is preferably 8% by weight or less, more preferably 5% by weight or less, in the emulsifier composition of the present invention. If the amount is more than 8% by weight, the feeling in use tends to deteriorate, which is not preferable.

In the present invention, it is preferable to further blend (f) a water-soluble polymer. Since the water-soluble polymer prevents separation of the emulsified particles, an oil-in-water emulsion composition having more long-term stability can be obtained.

The water-soluble polymer used in the present invention may be any one which can be generally used for cosmetics.
Natural water-soluble polymers, semi-synthetic water-soluble polymers, and synthetic water-soluble polymers are preferably used.

Examples of natural water-soluble polymers include guar gum, locust bee gum, quince seed, carrageenan, galactan, gum arabic, tragacanth gum,
Examples include polysaccharide-based natural polymers such as pectin, manan, starch, xanthan gum, dextran, succinoglucan, and guardlan.

Examples of the semi-synthetic water-soluble polymer include cellulose-based semi-synthetic materials such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose or salts thereof (eg, sodium salt and potassium salt), and methylhydroxypropylcellulose. Synthetic molecules; soluble starch,
Starch polymers such as carboxymethyl starch and methyl starch; alginic acid polymers such as propylene glycol alginate and alginates; and polysaccharide derivatives. Among these, in terms of usability, etc.,
Alginate, hydroxypropylcellulose, carboxymethylcellulose and the like are preferably used.

Examples of the synthetic water-soluble polymer include polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, carboxyvinyl polymer, sodium polyacrylate, polyethylene oxide, and ethylene oxide-propylene oxide block copolymer. Of these, carboxyvinyl polymers, pyrivinylpyrrolidone, and the like are preferably used in terms of usability and the like.

One or more water-soluble polymers can be selected and used.

The blending amount of the water-soluble polymer is preferably 5% by weight or less, more preferably 3% by weight or less, in the emulsifier composition of the present invention. If the content is more than 5% by weight, stickiness and the like tend to occur, and the feeling in use tends to deteriorate, which is not preferable.

In the aqueous phase (outer phase) used in the oil-in-water emulsion composition of the present invention, in addition to the above essential components and additional components, components which are generally blended as an aqueous phase of a cosmetic can be blended. Specifically, for example, humectants such as 1,3-butylene glycol, glycerin and the like; chelating agents such as metaphosphate and edetate; plant extracts such as yarrow extract and hamamelis extract; alcohol; pH adjusters Preservatives; water and the like, but are not limited thereto.

The oil phase (inner phase) used in the oil-in-water emulsion composition of the present invention includes, in addition to the above-mentioned essential components and additional components, any of polar and non-polar compounds generally blended as an oil phase of cosmetics. Oily components can also be included. Specifically, for example, hydrocarbons such as liquid paraffin, squalane, petrolatum; natural fats and oils such as macadamia nut oil, jojoba oil and olive oil; palmitic acid, stearic acid,
Fatty acids such as isostearic acid; synthetic polar oils such as glycerin 2-ethylhexanoate, isopropyl myristate, and cetyl 2-ethylhexanoate; and fluorine-based oils such as perfluoropolymethylisopropyl ether; Not something.

An appropriate amount of the oil phase component in the oil-in-water emulsion composition of the present invention is 0.5 to 70% by weight.

The oil-in-water emulsion composition of the present invention further comprises
If desired, optional additives can be blended within a range that does not impair the qualitative and quantitative effects of the present invention. Such components include, for example, vitamin A, vitamin B, vitamin D, vitamin E, tocopherol acetate, ascorbic acid ester, vitamin A acid, lecithin, γ-
Vitamins such as oryzanol and folic acid and vitamin-like active substances; estradiol, estradiol valerate, ethinyl estradiol, prostaglandin,
Hormones such as testosterone propionate; benzophenone, 4-t-butyl-4-methoxydibenzoylmethane, glyceryl ethylhexanoate dimethoxycinnamate, p-aminobenzoate, octyl paramethoxycinnamate, phenyl salicylate, etc. UV absorbers;
Anti-inflammatory agents such as L-menthol and camphor; Preservatives such as methylparaben, ethylparaben and butylparaben; Fungicides such as triclosan and dibutylhydroxytoluene; Pigments such as talc, kaolin, mica, titanium dioxide, iron oxide; Emulsions and synthetic resin emulsions such as polyethyl acrylate emulsions can be mentioned.

The oil-in-water emulsion composition of the present invention is, for example,
It can be manufactured by the following method.

That is, an oil phase and an aqueous phase each containing α-monoalkylglyceryl ether, waxes and silicone oil were heated to 70 ° C., and the heated aqueous phase was gradually added to the oil phase to emulsify. Emulsify with a machine. At this stage, a water-in-oil coarse emulsion is formed. The powder can be added to both the water and oil phases.

Thereafter, the mixture is allowed to cool to room temperature. Phase inversion occurs around 50 ° C. during cooling. Due to the decrease in interfacial tension during the phase inversion, an oil-in-water type fine emulsion is formed at room temperature. At the same time, a liquid crystal film having a layered structure is generated, and it is considered that the emulsion is stabilized.

The oil-in-water emulsion composition of the present invention can be stored for a long period of time without substantially containing a preservative such as paraben by setting the aqueous phase component under a certain condition. It is possible to That is, the water to be blended is 40
% By weight or less, and 5 to 20% by weight of glycols such as 1,3-butylene glycol and propylene glycol.
It is possible to provide an oil-in-water emulsion composition that does not substantially contain a preservative that can withstand long-term storage under conditions that include it, without any consideration in terms of production or container.

[0049]

Next, the present invention will be described in more detail with reference to examples. The present invention is not limited by this. In addition, the compounding amount is weight%.

(Examples 1 to 4, Comparative Examples 1 and 2)
The emulsified composition was obtained according to the following formula by a conventional method. Using this, long-term stability, use feeling, and emulsified state at the time of preparation were evaluated by the following test methods. Table 1 shows the results.

[Long-term stability] The condition after storage at 40 ° C for one month was visually evaluated. (Evaluation Criteria) 変 化: No change in state is recognized at all: Change in state is hardly recognized △: Change in state is slightly recognized ×: Change in state is clearly recognized

[Feeling of use] Using a special panel (10 persons), hands were actually applied and used, and the feeling of use was evaluated organoleptically. (Evaluation Criteria) ：: 80% or more of the subjects are considered good: 50% to less than 80% of the subjects are considered good Δ: 30% to less than 50% of the subjects are considered good ×: Less than 30% of the subjects Admit good

[Emulsified state during preparation] The emulsified state during preparation was visually evaluated. (Evaluation criteria) ：: Extremely good emulsified state: Good emulsified state △: Slightly poor emulsified state ×: Poorly emulsified state

[0054]

[Table 1]

(Example 5) (combination component) (combination amount) Aqueous phase ion-exchanged water 25.78 polyethylene glycol 15.0 sorbite solution 4.0 hydroxyethylcellulose 0.01 fructose 3.0 phenoxyethanol 0.1 disodium edetate 0.01 dipotassium glycyrrhizinate 0.05 B. Oil phase Decamethylcyclopentasiloxane 20.0 Octamethylcyclotetrasiloxane 10.0 Bacyl alcohol 3.0 Kimyl alcohol 1.0 Behenyl alcohol 2.0 Beeswax 3.0 Macadamia nut oil 1.0 Palmitic acid 2.0 Dimethylpoly Siloxane 2.0 Vitamin A palmitate 0.05 C.I. Spherical powder Spherical polystyrene 6.0 Nylon powder 2.0

(Example 6) (combination component) (combination amount) Aqueous phase ion-exchanged water 35.0 1,3-butylene glycol 13.0 polyethylene glycol 2.0 methylcellulose 0.05 mannitol 2.0 ethylparaben 0.1 ethyl alcohol 3.0 nicotinamide 0.05 edetate trisodium 0.01 aloe extract 0.01 B. Oil phase Decamethylcyclopentasiloxane 15.28 Bacyl alcohol 2.0 Stearyl alcohol 0.5 Salachi beeswax 2.0 Light isoparaffin 3.0 Vaseline 2.0 Methylphenyl polysiloxane 5.0 C.I. Spherical powder Polyester powder 5.0 Spherical cellulose 10.0

(Example 7) (combination component) (combination amount) Aqueous phase ion-exchanged water 32.29 glycerin 10.0 polyoxyethylene methyl glucoside 13.0 ethyl cellulose 0.5 mannitol 2.0 butyl paraben 0.1 trisodium edetate 0.01 loquat leaf extract 0.05 pyridoxine hydrochloride 0. 05 B. Oil phase Octamethylcyclotetrasiloxane 20.0 α-Mono (methyl branched stearyl) glyceryl ether 2.0 Kimyl alcohol 3.0 Myristyl alcohol 2.0 Lanolin 7.0 Isostearic acid 1.0 2 Cetyl ethylhexanoate 1. 0 methyl polysiloxane 3.0 C.I. Spherical powder Pearlescent silicone rubber powder 3.0

(Example 8) (combination component) (combination amount) Water phase Ion exchange water 35.83 Glycerin 7.0 Dipropylene glycol 5.0 1,3-butylene glycol 5.0 Ethyl cellulose 1.0 Mannitol 2.0 Butylparaben 0.1 Trisodium edetate 0.01 Loquat leaf extract 0.01 B. Oil phase Octamethylcyclotetrasiloxane 10.0 Decamethylcyclopentasiloxane 15.0 Bacyl alcohol 2.0 α-Mono (methyl branched stearyl) glyceryl ether 0.5 Hexdecanol 1.5 Microcrystalline wax 3.0 Liquid paraffin 0 dimethylpolysiloxane 3.0 retinol 0.05 C.I. Spherical powder Teflon powder 5.0 Polymethyl methacrylate 2.0 The emulsified compositions obtained in the above Examples 5 to 8 were all excellent in long-term stability and use feeling.

[0059]

As described in detail above, according to the present invention, an excellent oil-in-water emulsifying action can be obtained without substantially adding a surfactant, and safety, long-term stability, and feel during use can be obtained. It is possible to provide an oil-in-water emulsified composition excellent in water resistance.

Claims (9)

[Claims] 1. An oil-in-water emulsion composition obtained by emulsifying an aqueous phase (outer phase) and an oil phase (inner phase), wherein the composition comprises (a)
10% by weight or more of α-monoalkyl glyceryl ether, (b) wax, and (c) silicone oil in an oil phase (excluding α-monoalkyl glyceryl ether and wax); An oil-in-water emulsion composition comprising a spherical powder in an amount of 0.5 to 20% by weight based on the total amount of the composition, and substantially containing no surfactant. 2. The oil-in-water emulsion composition according to claim 1, wherein the alkyl group of (a) the α-monoalkyl glyceryl ether is a linear alkyl group. 3. The oil-in-water emulsion composition according to claim 1, wherein (a) the α-monoalkyl glyceryl ether is batyl alcohol. 4. The oil-in-water emulsion composition according to claim 1, wherein (b) the wax is an animal or plant wax. 5. The wax (b) is beeswax, candelilla wax, wood wax, cholesterol, phytosterol,
The oil-in-water emulsion composition according to claim 4, which is at least one member selected from the group consisting of a derivative thereof and a derivative thereof. 6. The oil-in-water emulsion composition according to any one of claims 1 to 5, further comprising (e) a higher alcohol. 7. The composition further comprising (f) a water-soluble polymer.
The oil-in-water emulsion composition according to any one of claims 1 to 6. 8. The oil-in-water emulsion according to claim 1, wherein the amount of the (a) α-monoalkyl glyceryl ether is 0.2 to 15% by weight based on the total amount of the composition. Composition. 9. The oil-in-water emulsion composition according to claim 1, wherein the amount of the wax (b) is 0.2 to 20% by weight based on the total weight of the composition.