JPH0987160A - Water-in-oil type emulsion cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-in-oil type emulsion cosmetic excellent in emulsion stability, having a refreshing and good feeling in use. SOLUTION: This water-in-oil type emulsion cosmetic comprises (A) 0.5-20wt.% of a water-soluble alkylcarboxylate (e.g. sodium citrate), (B) 0.5-5wt.% of a melanin production nonionic surfactant (e.g. diglyceryl monoisostearate) liquid at a normal temperature, (C) 15-35wt.% of an oily component (e.g. squalane) and (D) water. The water-in-oil type emulsion cosmetic is further mixed with a well-known component properly. An anti-suntan cosmetic is prepared by blending the water-in-oil type emulsion cosmetic with 0.1-30wt.% of an anti-suntan component except an oily ultraviolet light absorber. An emollient cream, hand cream, cleansing cream, foundation, make-up foundation cream, pack, milky lotion, etc., are prepared besides the anti-suntan cosmetic.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-in-oil type emulsion cosmetic having good emulsion stability and excellent feeling in use.

[0002]

2. Description of the Related Art Conventionally, water-in-oil emulsion cosmetics have used a lipophilic polyhydric alcohol fatty acid ester-based activator such as glycerin fatty acid ester and sorbitan fatty acid ester as an emulsifier, which is mixed with an oil phase to give 70-80 It is prepared by melting and heating at about ℃, then mixing and emulsifying with the aqueous phase heated to the same temperature. However, the water-in-oil type emulsion cosmetics produced as described above has a drawback that it is difficult to obtain a system excellent in temperature stability and usability. One of the methods to improve the temperature stability is to add a large amount of wax to the oil phase to increase the viscosity of the oil phase, which improves the low temperature stability but does not sufficiently improve the high temperature stability. However, there is a drawback that the usability such as spreading is impaired.

Alkylcarboxylate is a component generally used in emulsion cosmetics for the purpose of moisturizing, chelating effect, pH adjustment, etc., but its effect of improving the stability of water-in-oil emulsion cosmetics is known. It wasn't done.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a water-in-oil type emulsion cosmetic which is excellent in emulsion stability and has a refreshing and good feeling in use.

[0005]

As a result of intensive studies to solve these problems, the present inventor has blended an alkylcarboxylic acid salt with a lipophilic nonionic surfactant which is liquid at room temperature, an oily component, and water. The present invention has been completed by finding a water-in-oil type emulsion cosmetic having good stability and an excellent feeling during use. That is, the present invention comprises (A) 0.5 to 20% by weight of a water-soluble alkylcarboxylic acid salt, (B) 0.5 to 5% by weight of a lipophilic nonionic surfactant which is liquid at room temperature, and (C) an oily component 15 to The present invention relates to a water-in-oil type emulsified cosmetic characterized by containing 35% by weight (D) water.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The alkylcarboxylic acid salt used in the present invention is not particularly limited as long as it is a water-soluble salt, among which acetic acid, oxalic acid, succinic acid, glycolic acid,
Alkali metal salts such as sodium and potassium such as malic acid, tartaric acid, citric acid, fumaric acid, malonic acid and glucuronic acid are preferable. These water-soluble alkyl carboxylic acids are 1
One kind or two or more kinds can be used, and the blending amount thereof is 0.5 to 20% by weight based on the total amount of the composition. If the content of the water-soluble alkylcarboxylic acid salt is less than 0.5% by weight, the emulsification will be impaired or the emulsion stability will be poor, and if it exceeds 20% by weight, the feeling of use such as stickiness will be impaired. Be done.

The lipophilic nonionic surfactant which is liquid at room temperature for use in the present invention is not particularly limited as long as it is usually used in cosmetics. For example, diglyceryl monooleate, diglyceryl dioleate, diglyceryl monoisostearate, tetraglyceryl monooleate, decaglyceryl pentaoleate, decaglyceryl pentaisostearate, sorbitan monooleate, sorbitan sesquiisostearate. , Polyoxyethylene (3EO) castor oil, polyoxyethylene (10EO) castor oil, polyoxyethylene (5EO) hydrogenated castor oil, polyoxyethylene (10EO) hydrogenated castor oil, and the like.

Among them, diglyceryl monooleate, diglyceryl dioleate, diglyceryl monoisostearate, tetraglyceryl monooleate, sorbitan sesquioleate, sorbitan trioleate, sorbitan monoisostearate, sorbitan sesquiisostearate, polyoxyethylene. (3EO) castor oil, polyoxyethylene (10EO) castor oil, polyoxyethylene (5EO) hydrogenated castor oil, polyoxyethylene (1
(0EO) hydrogenated castor oil is preferred, particularly diglyceryl monooleate, diglyceryl dioleate, diglyceryl monoisostearate, tetraglyceryl monooleate, sorbitan monoisostearate, sorbitan sesquiisostearate, polyoxyethylene (3EO).
Castor oil and polyoxyethylene (5EO) hydrogenated castor oil are preferred.

These lipophilic nonionic surfactants which are liquid at room temperature can be used alone or in combination of two or more,
The blending amount is 0.5 to 5% by weight based on the total amount of the composition. If the amount of the lipophilic surfactant that is liquid at room temperature is less than 0.5% by weight, the emulsion cannot be emulsified, and if it exceeds 5% by weight, the stability is impaired.

The oily component used in the present invention is not particularly limited as long as it is an oily component which can be usually used in cosmetics. Hydrocarbons such as liquid paraffin, squalane, olefin olegomers, petrolatum, ceresin, paraffin, and microcrystalline wax.
Waxes such as lanolin, beeswax and candelilla wax.
Fatty acids such as stearic acid and oleic acid, cetanol,
Higher alcohols such as stearyl alcohol, octyldodecyl oleate, oleyl oleate, isostearyl octoate, cetyl octoate, isopropyl myristate, neopentyl glycol dioctanoate, neopentyl glycol dicaprate, pentaerythritol tetra-2-ethylhexanoate, etc. Fatty acid esters, silicone oils such as methyl polysiloxane, methyl phenyl polysiloxane and highly polymerized methyl polysiloxane, metal soaps such as magnesium myristate, aluminum stearate and magnesium stearate, octyl paradimethylaminobenzoate, octyl salicylate , Homomenthyl salicylate, paramethoxycinnamic acid 2
Examples thereof include oily ultraviolet absorbers such as -ethylhexyl, 2-ethoxyethyl 4-methoxycinnamate, glyceryl mono-2-ethylhexanoate diparamethoxycinnamate, and oxybenzone.

Among them, liquid paraffin, squalane, microcrystalline wax, beeswax, cetanol, neopentyl glycol dioctanoate, neopentyl glycol dicaprate, pentaerythritol tetra-2-ethylhexanoate, silicone oil, aluminum stearate, magnesium stearate, paramethoxy. 2-Ethylhexyl cinnamate, 2-ethoxyethyl 4-methoxycinnamate, glyceryl mono-2-ethylhexanoate diparamethoxycinnamate, and oxybenzone are preferred.

These oily components may be used alone or in combination of two or more, and the blending amount thereof is 15 to 35% by weight. If it is less than 15% by weight, the production becomes difficult, and If the amount is more than 35% by weight, the emulsion stability will be impaired.

Furthermore, when the water-in-oil type emulsion cosmetic of the present invention is used for sunscreen, one or more organic or inorganic sunscreen components other than the oily ultraviolet absorber should be blended. Examples of the organic sunscreen component include tetrahydroxybenzophenone and oxybenzone sulfonate, and examples of the inorganic sunscreen component include particulate titanium oxide and particulate zinc oxide. The inorganic sunscreen component may be surface-treated with silicone, metal soap, higher fatty acid, silicon oxide, alumina, zirconia oxide, amino acid, collagen, lecithin or the like. The amount of the sunscreen component other than these oily ultraviolet absorbers is 0.1 to 30% by weight, and particularly preferably 5 to 20% by weight, based on the total amount of the composition.

The water-in-oil type emulsion cosmetics of the present invention include, in addition to sunscreen cosmetics, emollient creams, hand creams,
It can be used for cleansing, foundation, cream for makeup base, pack, emulsion, etc.
Glycerin, diglycerin, dipropylene glycol, triethylene glycol, 1,3-butylene glycol, polyhydric alcohols such as propylene glycol, mucopolysaccharides such as hyaluronic acid, sodium chloride, magnesium sulfate within a range that does not impair the effects of the present invention. Inorganic salts, vitamins, medicinal agents such as glycyrrhetinic acid ester, glycyrrhizinate, pigments such as talc, kaolin and mica,
Known components such as antiseptics, dispersants, antioxidants, dyes, pigments, pH adjusters, chelating agents, astringents, and flavoring agents can be appropriately added.

Next, a method for producing the water-in-oil type emulsion cosmetic of the present invention will be described. This emulsified cosmetic composition can be produced by a conventional method (method A), and an aqueous solution of an alkylcarboxylic acid salt prepared by dissolving all of the alkylcarboxylic acid salt in a part of water is prepared. Prepare a mixture of ionic surfactants. A method in which this mixture is mixed with an oily component and then mixed with the rest of water to emulsify (method B). Alternatively, an aqueous solution of an alkylcarboxylate in which a part of the alkylcarboxylate is dissolved in a part of water is prepared, and then a mixture of this and a lipophilic nonionic surfactant which is liquid at room temperature is prepared. A composition which can be produced by a method (method C) of mixing this mixture with an oily component and then mixing with the rest of water containing the remainder of the alkylcarboxylic acid salt (method C), and produced by (method A) The composition according to (B method) or (C method) is superior in emulsion stability to

[0016]

The present invention will be described in more detail with reference to the following examples. Needless to say, the present invention is not limited to these examples. Unless otherwise specified, [%] in the examples means [% by weight]. The examples and comparative examples shown in Table 1 were prepared by the method described, and the emulsion stability and the feeling of use were evaluated. The evaluation method is shown.

(Evaluation method) 1. Emulsion stability Immediately after preparation of the prepared Examples (and Comparative Examples), 40
Let stand under the conditions of ℃, room temperature and -5 ℃. Two weeks after the preparation, the standing sample under each condition was visually judged by the following judgment criteria. <Judgment Criteria> A: Not separated. ◯: Although not separated, the emulsion as a whole is coarse. Δ: Slightly separated. X: Completely separated.

2. Sense of use 5 panelists actually used the product and evaluated it according to the following criteria from the viewpoints of mildew, oiliness, and stickiness. <Judgment criteria> ◎: 5 people answered that they were good. ○: 3 to 4 people answered that they were good. Δ: 1-2 people answered that they were good. ×: 0 people answered that they were good.

3. Overall Evaluation <Judgment Criteria> ◯: All of the above two evaluation items are ◯ or ◎. Δ: Out of the above two evaluation items, the feeling of use is Δ, and the emulsion stability is ◯ or more. X: One of the above two evaluation items is x, or the emulsion stability is Δ.

[0020]

[Table 1]

From the results shown in Table 1, it was confirmed that Examples 1 to 6 were superior in emulsion stability and feeling of use as compared with Comparative Examples 1 to 5. Further, in the production method, it was recognized that the methods B and C were superior to the method A in terms of emulsion stability.

Example 7 (Cream Foundation) Ingredients Amount (%) Liquid paraffin 10.0 Lanolin 1.5 Cetanol 1.5 Decamethylcyclopentasiloxane 10.0 Talc 2.0 Titanium oxide 5.0 Iron oxide 2. 0 magnesium stearate 1.0 polyoxyethylene (5EO) hydrogenated castor oil 0.5 diglyceryl isostearate 2.5 sodium acetate 10.0 1,3-butylene glycol 5.0 sodium chloride 1.0 preservative trace amount perfume trace amount Purified water Total remaining amount 100.0

Example 8 (Sunscreen cream) Ingredients Amount (%) Squalane 4.0 Microcrystalline wax 2.0 Cetanol 1.0 Decamethylcyclopentasiloxane 10.0 Highly polymerized methylpolysiloxane 0.3 Neo dicaprate Pentyl glycol 5.0 Diparamethoxycinnamic acid mono-2-ethylhexanoate glyceryl 4.0 Dibenzoylmethane 3.0 Diglyceryl monooleate 3.5 Fine particle zinc oxide 5.0 Fine particle titanium oxide 5.0 Stearic acid Magnesium 0.5 Sodium succinate 2.0 Propylene glycol 3.0 Preservative Trace amount Perfume Trace amount Purified water Residual amount Total 100.0

Example 9 (Face cream) Ingredients Amount (%) Squalane 15.0 Beeswax 2.0 Cetanol 1.0 Decamethylcyclopentasiloxane 3.0 Sodium citrate 4.5 Neopentyl glycol dicaprate 5.0 1,3-butylene glycol 5.0 diglyceryl monooleate 3.0 magnesium stearate 1.0 preservative trace amount fragrance trace amount purified water residual amount total 100.0

[0025]

EFFECTS OF THE INVENTION According to the present invention, the water-in-oil type emulsified cosmetic having improved emulsion stability and feeling of use, which are problems of the conventional water-in-oil type emulsion cosmetics, and having excellent stability and refreshing feeling of use. Can provide a fee.

Claims (2)

[Claims] 1. A water-soluble alkylcarboxylic acid salt of (A).
5 to 20% by weight, (B) 0.5 to 5% by weight of a lipophilic nonionic surfactant which is liquid at room temperature, (C) 15 to 35% by weight of an oily component (D) an oil characterized by being blended Medium water type emulsion cosmetics. 2. The (A) water-soluble alkylcarboxylic acid salt is one or two selected from acetic acid, oxalic acid, succinic acid, glycolic acid, malic acid, tartaric acid, citric acid, fumaric acid, malonic acid and glucuronic acid. It is above, The water-in-oil type emulsion cosmetics of Claim 1 characterized by the above-mentioned.