JPH09301823A - Water-in-oil type emulsion cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a water-in-oil type emulsion cosmetic which is excellent in stability and gives freshening application feeling by formulating a specific emulsifier, a specific lipophilic nonionic surfactant, an oily component and a specific pigment mix in a specific proportion. SOLUTION: This cosmetic comprises (A) a component selected from betain, pyrrolidonecarboxylic salt and water-soluble alkylcarboxylic salt in an amount of 0.5-20wt.%, (B) a lipophilic nonionic surfactant which is oily at room temperature in an amount of 0.5-5wt.%, (C) an oily component in an amount of 15-40wt.% and (D) a pigment mix containing the first pigment selected from fine particles of titanium oxide and/or fine particles of zinc oxide and the second pigment, at least one selected from talc, sericite, mica and kaolin in an amount of 1-40wt.%. The pigment mix preferably undergoes hydrophobic treatment beforehand. Particularly the pigment mix is treated with methyl hydrogen polysiloxane in an amount of 0.5-10wt.% based on the pigment mix.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has a good usability,
The present invention also relates to a water-in-oil emulsion cosmetic having excellent stability.

[0002]

Conventionally, water-in-oil emulsion cosmetics (hereinafter referred to as W / O emulsions) have an HLB value of 1 as an emulsifier.
To 12 lipophilic surfactants, for example, polyhydric alcohol fatty acid ester-based activators such as glycerin fatty acid ester and sorbitan fatty acid ester are added to the oil phase, and the mixture is heated and dissolved at about 70 to 80 ° C. Then, a water phase heated to a similar temperature was added and mixed to obtain a W / O type emulsion. However, the W / O type emulsion thus obtained is an oil-in-water type emulsion cosmetic (hereinafter referred to as O / O type).
There is a drawback that it is difficult to obtain a system excellent in stability and usability, especially under the condition that the powder is mixed, as compared with (W emulsion). 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, but this improves the low temperature stability, but at high temperatures, Oil phase separation due to coalescence of water phases due to softening, melting, etc. cannot be sufficiently improved, there is no problem with usability such as spreading, and wax can increase viscosity, but powder is blended It had the drawback that it was difficult to avoid.

As a method for improving such usability problems, it is preferable to mix polar oil components such as ester oils, which are often used in O / W type emulsion systems, but the W / O type emulsifiers which have been conventionally used have been used. However, it was difficult to produce a W / O type emulsion having excellent stability in a system containing a polar oil. In addition, the oil phase amount is usually 50 to 75% by weight, the emulsifier content is also large, the spreadability is heavy, and not only the usability problems such as stickiness but also the drawbacks such as irritation to the skin are caused. There is. It is desired to improve the above problems in such W / O type emulsion cosmetics.

[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 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 found that a component selected from betaine, pyrrolidonecarboxylate, lactate, and water-soluble alkylcarboxylate and a liquid parent at room temperature are used. The present invention has been completed by finding a water-in-oil type emulsion cosmetic having good stability and excellent feeling of use, which is prepared by mixing an oily nonionic surfactant, an oil agent and water.

That is, the present invention comprises (A) 0.5 to 20% by weight of one or more components selected from betaine, pyrrolidonecarboxylate or water-soluble alkylcarboxylate, (B)
0.5 to 5% by weight of lipophilic nonionic surfactant which is liquid at room temperature, (C) 15.0 to 45% by weight of oily component (D) First pigment of fine particle titanium oxide and / or fine particle zinc oxide and talc, seri A water-in-oil type emulsion cosmetic, comprising 1 to 40% of a mixed pigment premixed with one or more kinds of second pigments selected from sight, mica and kaolin.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Betaine used in the present invention is a component also called trimethylbetaine, which is usually extracted from molasses which is a by-product of beet sugar, purified and crystallized, and aminocoat (manufactured by Asahi Foods), It is commercially available as Aqua Dew (made by Ajinomoto). Pyrrolidonecarboxylates include sodium pyrrolidonecarboxylate, potassium pyrrolidonecarboxylate, triethanolamine pyrrolidonecarboxylic acid, and the like, which are commonly used in cosmetics. The water-soluble alkylcarboxylic acid salts are alkali metal salts such as lactic acid, acetic acid, oxalic acid, succinic acid, glycolic acid, malic acid, tartaric acid, citric acid, fumaric acid, malonic acid, and glucuronic acid, and among them, betaine and pyrrolidone. Carboxylates are preferred, and betaine is most preferred.
In the present invention, one kind or two or more kinds of these components can be used, and the blending amount thereof is 0.5 to 2 with respect to the total amount of the composition.
It is 0% by weight, preferably 0.5 to 15% by weight. If the blending amount is less than 0.5% by weight, emulsification may be impaired,
Alternatively, the emulsion stability is poor, and when it is blended in an amount of more than 20% by weight, the feeling of use such as stickiness is impaired.

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 sesquioleate, sorbitan trioleate. , Sorbitan monoisostearate, sorbitan sesquiisostearate, polyoxyethylene (3E
O) 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 (10E
O) hydrogenated castor oil is preferable, particularly diglyceryl monooleate, diglyceryl dioleate, diglyceryl monoisostearate, tetraglyceryl monooleate, sorbitan monoisostearate, sorbitan sesquiisostearate, polyoxyethylene (3EO) castor oil. , Polyoxyethylene (5EO) hydrogenated castor oil,
Polyoxyethylene (10 EO) hydrogenated castor oil is 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 with respect to the total amount of the composition,
It is preferably 0.5 to 4% by weight. 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, pentaerythrite tetra-2-ethylhexanoate, etc. Fatty acid esters, methylpolysiloxane, methylphenylpolysiloxane, highly polymerized methylpolysiloxane, silicones, magnesium myristate, aluminum stearate, magnesium stearate, and other metal soaps, octyl paradimethylaminobenzoate, octyl salicylate , Homomenthyl salicylate, paramethoxycinnamic acid 2
Examples include oil-based ultraviolet absorbers such as -ethylhexyl, 2-ethoxyethyl 4-methoxycinnamate, and glyceryl mono-2-ethylhexanoate diparamethoxycinnamate.

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

These oily components may be used alone or in combination of two or more, and the blending amount thereof is 15 to 45% by weight, preferably 15 to 40% by weight, and the blending amount is 15% by weight. If the amount is less than 40%, it becomes difficult to produce, and if it exceeds 45% by weight, the stability is impaired.

The mixed pigment used in the present invention is usually 10 to 1
A fine particle titanium oxide or fine particle zinc oxide having an average primary particle diameter of 00 nm, preferably 10 to 50 nm, and one or more pigments selected from talc, sericite, mica and kaolin are highly dispersed and mixed in advance. The compounding amount is from 1 to 40% by weight, preferably from 5 to 30% by weight, and in this range, the ultraviolet ray preventing effect is exhibited and the compounding is easy. Furthermore, these mixed pigments are, for example,
It can be hydrophobized with silicone such as methylhydrogenpolysiloxane, metal soap, higher fatty acid, phospholipid, higher alcohol, etc., and methylhydrogenpolysiloxane is particularly preferable. Methyl hydrogen polysiloxane is 0.5 to 10% by weight. In the mixed pigment of the present invention,
The weight ratio of the first pigment to the second pigment of the particulate titanium oxide and / or the particulate zinc oxide is in the range of 3: 7 to 9: 1, preferably 4: 6 to 8: 2.

Next, the method for producing the water-in-oil type emulsion cosmetic of the present invention will be described. The emulsified cosmetic composition of the present invention can be produced by a conventional method (method A), and also prepares an aqueous solution of the component (A) in which all of the component (A) is dissolved in a part of water, and then the aqueous solution and a parent liquid which is liquid at room temperature. A mixture of oily nonionic surfactant is prepared. 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 in which a part of the component (A) is dissolved in a part of water is prepared, and then a mixture of this aqueous solution and a lipophilic nonionic surfactant which is liquid at room temperature is prepared. A composition produced by the (A method) which can be produced by the method (C method) of mixing the mixture with the oily component and then emulsifying with the remaining water of the component (A). The composition according to (B method) or (C method) is superior in stability to

The water-in-oil type emulsified cosmetic composition of the present invention can be used as a sunscreen cream or emulsion, a cream for makeup base, a foundation and the like, and glycerin can be used according to the respective purposes within a range not impairing the effects of the present invention. , Diglycerin,
Dipropylene glycol, triethylene glycol, 1,
Moisturizers such as 3-butylene glycol, propylene glycol and hyaluronic acid, emulsion stabilizers such as sodium chloride and magnesium sulfate, medicinal agents such as vitamins, glycyrrhetinic acid esters and glycyrrhizinate, other preservatives, dispersants, antioxidants, Known components such as a dye, a pigment, a pH adjusting agent, a chelating agent, an astringent, and a flavoring agent can be appropriately added.

Further, when used for sunscreen, water-soluble UV absorbers such as benzophenone and dibenzoylmethane can be blended except for the oil-based UV absorber. The blending amount of these components is the composition. It is 0.1 to 15% by weight, and particularly preferably 1 to 10% by weight based on the total amount.

[0018]

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 above-mentioned method (A), and stability and usability were evaluated. The evaluation method is shown.

(Evaluation method) 1. Stability Immediately after preparation of the prepared Examples (and Comparative Examples), 40
Let stand under the conditions of ℃, room temperature and -5 ℃. One month after the preparation, the samples left to stand under each condition were visually judged according to the following judgment criteria. <Judgment criteria> ○: Not separated. Δ: Slightly separated. X: Completely separated.

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

3. Overall Evaluation <Judgment Criteria> ◯: Both of the above two evaluation items are ◯. Δ: Among the above two evaluation items, the feeling of use is Δ and the stability is ◯. X: The stability of the above two evaluation items is Δ or ×.

[0022]

[Table 1]

Example 6 (Sunscreen) Ingredients Amount (%) Mixed Pigment 15.0 (Fine Titanium Oxide: Talc = 7: 3) Squalane 10.0 Cyclic Silicone (n = 5) 18.0 Magnesium Stearate 1 0.0 Polyglyceryl monoisostearate 2.0 Sodium pyrrolidonecarboxylate (50% aqueous solution) 10.0 1,3-Butylene glycol 5.0 Preservative appropriate amount Fragrance appropriate amount Purified water Remaining amount 100.0

[0024]

INDUSTRIAL APPLICABILITY According to the present invention, a pigment premixed with a lipophilic nonionic surfactant which is liquid at room temperature, an oily component, and one or more kinds selected from betaine, pyrrolidonecarboxylate or water-soluble alkylcarboxylate. It was confirmed that the water-in-oil type emulsion cosmetics containing is excellent in stability and has a good usability.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location A61K 7/48 A61K 7/48

Claims (5)

[Claims] 1. A component selected from (A) betaine, pyrrolidone carboxylate, and water-soluble alkyl carboxylate.
0.5 to 20% by weight of seeds, 0.5 to 5% by weight of (B) lipophilic nonionic surfactant which is liquid at room temperature, and (C) oily component 1
5 to 45% by weight, (D) a mixed pigment 1 in which a first pigment of fine particle titanium oxide and / or fine particle zinc oxide and one or more second pigments selected from talc, sericite, mica and kaolin are mixed in advance. A water-in-oil type emulsified cosmetic composition containing 40% by weight. 2. The water-in-oil emulsion cosmetic according to claim 1, wherein (A) is at least one selected from betaine and pyrrolidone carboxylate. 3. The water-in-oil emulsion cosmetic according to claim 1, wherein (A) is betaine. 4. The water-in-oil type emulsified cosmetic composition according to claim 1, wherein the (D) mixed pigment is a hydrophobized mixed pigment. 5. The mixed pigment according to claim 4, wherein the mixed pigment is hydrophobized with methylhydrogenpolysiloxane, and the treatment ratio is 0.5 to 10% by weight based on the mixed pigment. Water-in-oil emulsion cosmetic.