JP2001058921A - Water-in-oil type emulsified composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition providing refreshing feeling and freshness when applied and also excellent in stability by including a specific silicone, oil, water, ethyl alcohol and dextrin fatty acid ester. SOLUTION: This composition is obtained by including (A) 0.1-10.0 wt.% of a polyether-modified silicone of the formula [A is methyl, phenyl or B; B is a polyoxyalkylene of the formula: C3H6O(C2H4O)a(C3H6O)bR' (R' is H, an acyl, or 1-4C alkyl; (a) and b are each 5-50); R is methyl or phenyl; m is 50-1,000; n is 1-40; wherein having at least one polyoxyalkylene in the molecule and also >=40 wt.% of the polyoxyalkylene therein and the molecular weight of the polyether-modified silicone is >=30,000], (B) 3.0-30.0 wt.% of an oil, (C) water, (D) ethyl alcohol and (E) 0.1-5.0 wt.% of a dextrin fatty acid ester. This composition is useful as e.g. an emulsified cosmetic.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water-in-oil type emulsion composition, and more particularly to a water-in-oil type emulsion composition which gives a refreshing sensation and freshness upon application and has extremely good stability.

[0002]

2. Description of the Related Art Conventionally, a water-in-oil type emulsified composition has a high emollient effect on the skin and can provide a moist and supple feeling of use. It has been used in a variety of applications, including:

[0003]

However, in general, a water-in-oil emulsion composition is moist but lacks freshness, and has a non-greasy feel and a refreshing feel because the external phase, which is a continuous phase, is oily. Will be spoiled. In addition, it is difficult to add an alcohol because of the emulsification stability, so that a refreshing feeling cannot be imparted, and a solution has been desired.

[0004]

The present inventors have conducted intensive studies in view of the above circumstances, and as a result, have found that one or more specific polyether-modified silicones, oil, water, ethyl alcohol, and dextrin By containing fatty acid ester, gives a refreshing feeling and freshness at the time of application,
In addition, they have found that a water-in-oil type emulsion composition having extremely good stability can be obtained, and the present invention has been completed.

That is, the present invention provides (a) 0.1 to 10.0% by weight of one or more polyether-modified silicones represented by the following general formula (1), and (b) an oil content of 3.0. -30.0% by weight, (c) water, (d) ethyl alcohol, and (e) 0.1-5.0% by weight of a dextrin fatty acid ester. It is a middle water emulsion composition.

[0006]

Embedded image

In the formula, A represents a methyl group, a phenyl group or B described later, and B represents a general formula: —C ₃ H ₆ O (C ₂ H
_{4 O) a (C 3 H} 6 O) bR '( where, R' is hydrogen atom, an acyl group, and a group selected from the group consisting of alkyl group having 1 to 4 carbon atoms, a is 5 to An integer of 50, b
Is an integer of 5 to 50. ), R is a methyl group or a phenyl group, m is an integer of 50 to 1000, and n is an integer of 1 to 40. However, at least one has a polyoxyalkylene group in the molecule. Further, the polyoxyalkylene group is contained in the molecule in an amount of 40% by weight or more, and the molecular weight of the polyether-modified silicone is 30,000 or more. In the present invention, the water-in-oil emulsion composition means that the discontinuous phase is a phase of a water-ethanol mixture.

Hereinafter, the configuration of the present invention will be described. The polyether-modified silicone (a) used in the present invention is an organopolysiloxane having a polyoxyalkylene group represented by the general formula (1).

The polyether-modified silicone molecule must contain at least 40% by weight of a polyoxyalkylene group. Specific examples of the acyl group of R ′ in the polyoxyalkylene group include a formyl group, an acetyl group, a propionyl group, a butyroyl group, an acryloyl group, a benzoyl group, and a toluoyl group. Specific examples of the group include a methyl group, an ethyl group, i
-Propyl group, n-propyl group, t-butyl group and n-butyl group are exemplified.

In the polyoxyalkylene group,
When a or b is less than 5, the polyether-modified silicone does not show a sufficient emulsifying effect, and
When b is more than 50, the obtained water-in-oil emulsion composition has a sticky feeling.

The content of the polyoxyalkylene group is at least 40% by weight, preferably in the range of 40 to 70% by weight. This means that the polyoxyalkylene group content is 40
If the amount is less than 70% by weight, the emulsifiability of non-polar oils other than silicone oil is reduced, and if the amount is more than 70% by weight, the obtained emulsified composition becomes sticky. Further, m is an integer of 50 to 1000, and n is 1 to
It is an integer of 40. This is because when m is less than 50 and n is less than 1, the emulsifying effect is insufficient, and when m exceeds 1000 and n exceeds 40,
This is because the obtained emulsion composition has a sticky feeling.

The polyether-modified silicone used in the present invention has a molecular weight of 30,000 or more,
00 or more is preferable. This is because when the molecular weight of the polyether-modified silicone is less than 30,000, the emulsifying ability for non-polar oil components other than silicone oil is reduced.

As the polyether-modified silicone of the present invention, commercially available TS Polymer 50-D5 (manufactured by Dow Corning Toray Silicone Co., Ltd.) and the like can be mentioned.

The amount of the polyether-modified silicone used in the present invention is 0.1 to 10.0% by weight, preferably 1.0 to 5.0% by weight. If the amount of the polyether-modified silicone is less than 0.1% by weight, a stable emulsified state cannot be obtained.
If the amount is more than 10% by weight, the emulsified composition may have a sticky feeling.

[0015] The oil component (b) used in the present invention is not particularly limited, and any oil component used in an emulsified composition can be used. Examples of the silicone oil include dimethylpolysiloxane and methylphenylpolysiloxane. Diorganopolysiloxanes of low to high viscosity, such as methylhydrogenpolysiloxane, dimethylsiloxane / methylphenylsiloxane copolymer; octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, tetramethyltetraphenyltetracyclosiloxane, etc. Cyclic siloxanes; solutions of chain or cyclic siloxanes such as gum-like dimethylpolysiloxane, gum-like dimethylsiloxane / methylphenylsiloxane copolymer, gum-like dimethylpolysiloxane; trimethylsiloxysilicic acid; A chain or cyclic siloxane solution of tylsiloxysilicic acid; and modified silicone oils such as diorganopolysiloxane having an alkyl group having 6 to 50 carbon atoms, amino-modified silicone, alkyl-modified silicone, and fluorine-modified silicone. Examples of the polar oil component include hydrocarbon oils such as squalane, liquid paraffin, light liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, and heavy liquid isoparaffin.

In the emulsified composition of the present invention, the oil content is 3.0 to 30.0% by weight, preferably 5.0 to 20.0% by weight, based on the total weight of the emulsified composition. . If the blending amount of the oil component is less than 3.0% by weight, water is separated from the emulsion, and it is difficult to obtain a stable emulsion.
If it exceeds 0.0% by weight, the oily feeling becomes remarkable,
Exceeds the allowable range.

The total amount of (c) water and (d) ethyl alcohol used in the present invention is preferably 1.0 to 95.0% by weight, more preferably 3.0 to 90.0% by weight. Range. If the amount is less than 1.0% by weight, a transparent gel is formed, and an emulsified composition cannot be obtained. If the amount exceeds 95.0% by weight, water is separated from the emulsified material and stable. This is because a proper emulsion cannot be obtained. In the present invention, the amount of ethyl alcohol is preferably 1.0 to 30.0% by weight. If the blending amount of ethanol is less than 1.0% by weight, a stable emulsified composition cannot be obtained, and if it exceeds 30.0% by weight, the viscosity is reduced and a stable emulsion cannot be obtained. .

The dextrin fatty acid ester (e) used in the present invention is, in particular, an ester compound of a fatty acid having 8 to 24 carbon atoms and a dextrin having an average degree of polymerization of 10 to 50. 0.
It is preferably 5 or more. For example, dextrin palmitic acid ester, dextrin stearic acid ester, dextrin palmitic acid stearic acid ester,
Examples thereof include dextrin ethyl oleate and dextrin isostearate, and these can be used alone or in combination of two or more.

The content of the dextrin fatty acid ester is from 0.1 to 5.0% by weight, preferably from 0.5 to 3.0% by weight, based on the total weight of the emulsified composition. If the amount is less than 0.1% by weight, the emulsion cannot be stabilized. If the amount exceeds 5.0% by weight, it becomes unfavorable because it becomes sticky when used as an emulsion composition.

In the water-in-oil emulsion composition of the present invention, in addition to the above-mentioned components, if necessary, a humectant, an ultraviolet absorber, a fragrance, an antioxidant, an antiseptic and a sunscreen, an extender pigment, a coloring pigment For example, components commonly used in cosmetics can be blended within a range that does not impair the effects of the present invention.

The use of the emulsified composition of the present invention is not limited, but it is used as an emulsified cosmetic, preferably a skin cosmetic.

[0022]

EXAMPLES Next, the present invention will be described more specifically with reference to examples and comparative examples. The present invention is not limited thereby. All amounts are by weight.

Examples 1-4, Comparative Examples 1-4 A cream as an emulsified cosmetic was prepared according to the formulations shown in Tables 1 and 2, and the obtained cream was subjected to a stability test and a panel specializing in women (10 persons). Was evaluated by a practical use test. The stability test results were determined by the appearance after standing at 50 ° C. for one month, and the actual use test was determined by the following evaluation criteria for preference during use. The results are shown in Tables 1 and 2.

(1) Evaluation criteria of stability ○: No separation is observed. Δ: Almost no separation was observed. ×: Separation of the liquid phase (oil phase or aqueous phase) occurred.

(2) Evaluation Criteria for Usability ７: Seven or more people felt cool feeling (or freshness) and judged good usability. Δ: Three or more and less than seven felt cool (or freshness), and were judged to be good in usability. ×: Less than 3 people felt cool feeling (or freshness) and judged good usability.

[0026]

[Table 1] {Example 1 2 3 4} ───────────────── (1) Liquid paraffin 2.0 2.0 2.0 2.0 (2) Decamethylcyclopentasiloxane 10.0 10.0 10.0 10.0 (3) Polyether-modified silicone ^{* 1} 2.0 2.0 1.0 2.0 (4) Dextrin palmitate 0.5-1.0 0.5 (5) Dextrin stearate-0.5--(6) 1,3-butylene glycol 3.0 3.0 3.0 3.0 (7) Ethanol 10.0 10.0 20.0 5.0 (8) Sodium chloride 1.0 1.0 1.0 1.0 (9) Deionized water 71.5 71.5 62.0 76.5 ───────────────────────────── Stability ○ ○ ○ ○ Refreshing feeling ○ ○ ◎ ○ Freshness ○ ○ ○ ○ ─────────────────────────────

[0027]

[Table 2] {Comparative Example 1 2 3 4} ───────────────── (1) Liquid paraffin 2.0 2.0 2.0 12.0 (2) Decamethylcyclopentasiloxane 10.0 10.0 10.0 10.0 (3) Polyether-modified silicone ^{* 1} 2.0 2.0 0.05 2.0 (4) Dextrin palmitate-0.5 0.5 0.5 (5) Dextrin stearate----(6) 1,3-butylene glycol 3.0 3.0 3.0 3.0 (7) Ethanol 10.0-10.0-(8) Sodium chloride 1.0 1.0 1.0 1.0 (9) Deionized water 71.5 81.5 73.45 71.5 ───────────────────────────── Stability ○ × × △ Refreshing ○ × ○ × Freshness × ○ ○ ○ ─────────────────────────────

* 1: Compound represented by the following formula (2) (molecular weight: 55000, polyoxyalkylene group content: 4)
5%).

[0029]

Embedded image

Example 5 Cream (1) Liquid paraffin 2.0% by weight (2) Decamethylcyclopentasiloxane 10.0 (3) Polyether-modified silicone 2.0 (compound represented by the above formula (2)) (4) Dextrin palmitate 0.5 (5) 1,3-butylene glycol 3.0 (6) Ethanol 10.0 (7) Sodium chloride 1.0 (8) Residual ion-exchanged water (9) Paraben 10) Suitable amount of antioxidant (11) Suitable amount of fragrance (Production method) (2), (3) and (11) are mixed and dispersed in (1), then (4) is mixed and dissolved by heating to prepare an oil phase in advance Keep it. Next, (5),
The aqueous phase of (8) in which (6), (7), (9) and (10) were dissolved and dispersed was
After heating, the mixture was gradually added to the oil phase with stirring using a high-speed stirrer to obtain the desired emulsified cosmetic. This cream had good usability, that is, it had a refreshing sensation and freshness, and good stability (○) as in Examples 1 to 4.

Example 6 Emulsion (1) Liquid paraffin 6.0% by weight (2) Decamethylcyclopentasiloxane 10.0 (3) 1,3-butylene glycol 3.0 (4) Polyether-modified silicone 1.0 (Compound represented by the formula (2)) (5) Dextrin palmitate 1.0 (6) Deionized water residue (7) Polyethylene glycol (molecular weight 3000) 2.0 (8) Sodium glutamate 0.5 ( 9) Paraben proper amount (10) Antioxidant proper amount (11) Flavor proper amount (Preparation method) (1), (2), (4), (11) are mixed and dispersed, then (5) is mixed and dissolved by heating. Prepare the oil phase in advance. Next, (3),
After heating the aqueous phase in which (6), (7), (8), (9), and (10) are dissolved to 70 ° C., gradually add the oil phase to the oil phase while stirring using a high-speed stirrer. Obtained. As in Examples 1 to 4, the present emulsion had good usability, that is, it had a refreshing sensation and freshness, and also had good stability ()).

[0032]

As described above, the water-in-oil type emulsion composition of the present invention gives a refreshing feeling and freshness upon application,
Moreover, the stability is extremely good.

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Claims (2)

[Claims] (A) one or more polyether-modified silicones represented by the following general formula (1):
10.0% by weight, (b) 3.0 to 30.0% by weight of oil, (c) water, (d) ethyl alcohol,
(E) 0.1 to 5.0% by weight of a dextrin fatty acid ester, which is a water-in-oil emulsion composition. Embedded image [In the formula, A represents a methyl group, a phenyl group or a later-described B, B has the general _{formula: -C 3 H 6 O (C} 2 H 4 O) a (C 3 H 6
O) bR ′ (wherein, R ′ is a group selected from the group consisting of a hydrogen atom, an acyl group, and an alkyl group having 1 to 4 carbon atoms, a is an integer of 5 to 50, and b is 5 Is an integer of from 50 to 50), R is a methyl group or a phenyl group, and m is from 50 to 50.
It is an integer of 1000, and n is an integer of 1 to 40. However, at least one has a polyoxyalkylene group in the molecule. Furthermore, the polyoxyalkylene group is contained in the molecule in an amount of 40% by weight or more, and the molecular weight of the polyether-modified silicone is 30,000 or more. ] 2. The water-in-oil type emulsion composition according to claim 1, wherein the emulsion composition is a skin cosmetic.