JPH09268120A - Water-in-oil type emulsified composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-in-oil type emulsified composition having excellent preservability and use feeling, and suitable for a cosmetic, etc. SOLUTION: This composition contains 0.5-5wt.% of 12-hydroxystearic acid and 0.5-3wt.% of a lipophilic nonionic surfactant having <=60 an average hydroxyl group value of the component other than water, the 12-hydroxystearic acid and powder, and <=6 HLB, and water and powder. A water-in-oil type cream using this composition has more improved usability than usual.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water-in-oil emulsion composition suitable for cosmetics and the like.

[0002]

BACKGROUND OF THE INVENTION Emulsified compositions are very useful as a cosmetic base or as a skin external drug base, and have been widely used for a long time. Among them, the oil-in-water emulsion has a refreshing feel because the external phase is an aqueous system and in many cases has a large water content, and it has been preferred because it is comfortable to use, but an aqueous composition such as sweat is used. There were drawbacks such as easy flow of the substance and difficulty in percutaneous absorption of the oily active ingredient. On the other hand, the water-in-oil emulsion composition overcomes such drawbacks, but many of them have a problem that the stability depends on the gel structure of the solid fat, which is a big problem in the feeling of use. was there. Through repeated studies to improve this, a high internal phase water-in-oil emulsion composition using a gel formed by a lipophilic nonionic surfactant and a saccharide was developed. By taking such a gel structure, this one has greatly improved the feeling of use, but the retention on the skin is far better than the oil-in-water emulsion composition, but it is not as good as the conventional water-in-oil emulsion composition. The comparison left a little problem. This is because the sugar, which is an essential component, has extremely high hydrophilicity and the amount of the surfactant used is the same as before. That is, it has been desired to further improve the retention of the water-in-oil emulsion composition.

[0003]

The present invention has been carried out under such circumstances, and an object of the present invention is to provide a water-in-oil emulsion composition having a good holding property and an excellent feeling in use.

[0004]

In view of such a situation,
The present inventors have conducted earnest studies for a water-in-oil emulsified composition having good retention and excellent usability, and as a result, in the water-in-oil emulsified composition containing 12-hydroxystearic acid, the following conditions were met. The inventors have found such a property in a composition satisfying the requirements and completed the invention. Hereinafter, the present invention will be described in detail. 1) The average hydroxyl value of components other than water, 12-hydroxystearic acid and powder is less than 60. 2) The surfactant is a lipophilic nonionic surfactant.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

(1) Water-in-oil emulsified composition of the present invention The water-in-oil emulsified composition of the present invention is characterized by satisfying the following conditions in a water-in-oil emulsified composition containing 12-hydroxystearic acid. To do. 1) The average hydroxyl value of components other than water, 12-hydroxystearic acid and powder is less than 60. 2) The surfactant is a lipophilic nonionic surfactant.

In the present invention, the preferable content of 12-hydroxystearic acid is 0.5 to 5% by weight,
It is more preferably 0.7 to 4% by weight, and further preferably 1 to 3% by weight. In the present invention, 12-hydroxystearic acid plays a role of maintaining the stability of the system by forming a gel structure with other oily components.

In the present invention, the preferred content of water is 1
It is 0 to 50% by weight, more preferably 15 to 45% by weight, and further preferably 20 to 40% by weight. This is because the stability may be impaired when the water content increases, and the feel may be impaired when the water content is too low.

In addition to these components, the composition of the present invention may contain optional components usually used in cosmetics and pharmaceutical compositions. Such optional ingredients include, for example, in cosmetics, hydrocarbons such as petrolatum and microcrystalline wax, esters such as jojoba oil and gay wax, triglycerides such as beef tallow and olive oil, cetanol and oleyl. Higher alcohols such as alcohol, fatty acids such as stearic acid and oleic acid, polyhydric alcohols such as glycerin and 1,3-butanediol,
Nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants, thickeners such as ethanol and carbopol, preservatives, ultraviolet absorbers, antioxidants, pigments,
Examples thereof include powders, and examples of the external pharmaceutical composition for skin include excipients, binders, coating agents, lubricants, sugar coating agents, disintegrating agents, bulking agents, flavoring agents, emulsifying / solubilizing agents. -A dispersant, a stabilizer, a pH adjuster, an isotonicity agent, etc. can be illustrated. However, in these optional components, the weighted average of the hydroxyl values of components other than the dye or powder is 0 or more and less than 60, and more preferably 0.
It is necessary that it is not less than 55 and more preferably not less than 0 and less than 50. Among these optional components, more preferred ones are acylated cholesterol analogs such as stearoyl cholesterol, acetyl cholesterol, and acetylated lanolin, and acetylated lanolin is most preferred. The preferred content of the acylated cholesterol analog in the present invention is 1 to 30% by weight,
More preferably, it is 2 to 20% by weight, still more preferably 3 to
It is 10% by weight. The acylated cholesterol analog does not destroy the gel structure formed by 12-hydroxystearic acid while improving the compatibility of the oil phase, and thus has the action of improving the stability of the system.

The method for producing the composition of the present invention may be carried out in accordance with the ordinary method for producing a water-in-oil emulsion composition.
It may be divided into an oily component and an aqueous component, each of which is heated and dissolved at 80 ° C., the aqueous component is gradually added to the oily component, and then cooled. When powders are blended as an optional component, the powders may be dispersed in the oil phase and / or the aqueous phase in advance and then emulsified in the same manner.

[0010]

The present invention will be described in detail below with reference to examples, but it goes without saying that the present invention is not limited to these examples.

Example 1 A water-in-oil cream was prepared according to the following formulation. That is,
A and B were weighed and melted by heating at 80 ° C., and B was gradually added to A to emulsify, followed by stirring and cooling to obtain a cream. still,
The weighted average of the hydroxyl value of the component excluding 12-hydroxystearic acid in item (a) was 42.7. B Dimethylpolysiloxane cyclic tetramer 15 Acetylated lanolin 7.5 12-Hydroxystearic acid 2.5 Glyceryl diolate 30 Triglycerol diisostearate 1.5 Butylparaben 0.1 B Water 43.4

Example 2 A water-in-oil cream was prepared according to the following formulation. That is,
A and B were weighed and melted by heating at 80 ° C., and B was gradually added to A to emulsify, followed by stirring and cooling to obtain a cream. still,
The weighted average of the hydroxyl value of the component excluding 12-hydroxystearic acid in item (a) was 54.8. B. Acetylated lanolin 7.5 12-Hydroxystearic acid 2.5 Glyceryl diolate 40 Light liquid isoparaffin 5 Triglycerol diisostearate 1.5 Butylparaben 0.1 B Water 43.4

Example 3 A water-in-oil cream foundation was prepared according to the following formulation. That is, (i) and (ii) were each weighed and dissolved by heating at 80 ° C., (iii) was dispersed in (i), then (ii) was gradually added to emulsify and the mixture was cooled with stirring to obtain a cream. In addition, 1 of this thing
The weighted average of the hydroxyl value of the components excluding 2-hydroxystearic acid was 40. B. Acetylated lanolin 7.5 12-Hydroxystearic acid 2.5 Glyceryldiolate 20 Light liquid isoparaffin 5 Dimethylpolysiloxane cyclic tetramer 10 Triglycerol diisostearate 1.5 Butylparaben 0.1 Ro water 23.4 Ha Oxidation Titanium 9 Yellow iron oxide 4 Red iron oxide 0.5 Talc 10 Sericite 6.5

Example 4 A water-in-oil cream foundation was prepared according to the following formulation. That is, (i) and (ii) were each weighed and dissolved by heating at 80 ° C., (iii) was dispersed in (i), then (ii) was gradually added to emulsify and the mixture was cooled with stirring to obtain a cream. In addition, 1 of this thing
The weighted average of the hydroxyl value of the components excluding 2-hydroxystearic acid was 54.5. B acetylated lanolin 5 12-hydroxystearic acid 2.5 glyceryldiolate 20 light liquid isoparaffin 5 dimethylpolysiloxane cyclic tetramer 10 triglycerol diisostearate 4 butylparaben 0.1 ro water 23.4 ha titanium oxide 9 yellow oxide Iron 4 Bengala 0.5 Talc 10 Sericite 6.5

Example 5 A water-in-oil skin external preparation was prepared according to the following formulation. That is,
A and B were weighed and melted by heating at 80 ° C., B was gradually added to B to emulsify, and the mixture was stirred and cooled to obtain an external preparation. In addition, the weighted average of the hydroxyl value of the component excluding 12-hydroxystearic acid in (a) was 42.7. B Dimethylpolysiloxane cyclic tetramer 15 Acetylated lanolin 7.5 12-Hydroxystearic acid 2.5 Glyceryldiolate 30 Triglycerol diisostearate 1.5 Butylparaben 0.1 Ro water 42.4 Miconazole nitrate 1

Example 6 Usage Test The creams of Examples 1 and 2 were evaluated for their usability by 5 expert panelists. As a comparative example, the following cream having the best usability in water-in-oil is used. Regarding usability, "good spreadability", "no stickiness", and "adhesion" are very good, but 5 points, and very bad, 1 point. Table 1 shows the average scores.
From this, it is understood that the usability of the water-in-oil cream of the present invention is further improved as compared with the conventional products.

Comparative Example Light liquid paraffin 20 Liquid paraffin 10 Maltitol 10 Triglycerol diisostearate 5 Glycerin 5 Propylene glycol 5 Butylparaben 0.1 Methylparaben 0.3 Water 44.6

[0018]

[Table 1]

Example 7 Usage Test The foundations of Examples 3 and 4 were tested for usage. That is, five professional panelists were used to rate "good makeup lasting", "non-stickiness" and "adhesiveness" with 5 points for very good and 1 point for very bad. As a comparative example, the following water-in-oil foundation was used. Table 2 shows the results. From this, it is understood that the foundation of the present invention is excellent in usability. In particular, the longevity of makeup is excellent because the emulsion of the present invention has a small amount of surfactant and its hydrophilicity is low.

COMPARATIVE EXAMPLE Light liquid isoparaffin 10 Liquid paraffin 10 Maltitol 10 Triglycerol diisostearate 5 Glycerin 5 Propylene glycol 5 Butylparaben 0.1 Methylparaben 0.3 Water 38.6 Titanium oxide 9 Yellow iron oxide 4 Bengala 0. 5 Talc 10 Sericite 6.5

[0021]

[Table 2]

Example 8 Stability Test The stability of the creams of Examples 1 and 2 at 40 ° C. was examined. As comparative examples, the following formulations were similarly compared. The evaluation criteria were ◯: no problem, Δ: slightly separated, and ×: completely separated. The results are shown in Table 3. From this, it is understood that the stability is excellent when the hydroxyl value is less than 60, and further less than 50.

Comparative Example: Hydroxyl value 60.72 Acetylated lanolin 7.5 12-Hydroxystearic acid 2.5 Glyceryldiolate 45 Triglycerol diisostearate 1.5 Butylparaben 0.1 Water 43.4

[0024]

[Table 3]

[0025]

According to the present invention, it is possible to provide a water-in-oil emulsified composition having a good holding property and an excellent feeling in use.

Claims (8)

[Claims] 1. A water-in-oil emulsion composition containing 12-hydroxystearic acid, which composition satisfies the following conditions. 1) The average hydroxyl value of components other than water, 12-hydroxystearic acid and powder is less than 60. 2) The surfactant is a lipophilic nonionic surfactant. 2. The water-in-oil emulsion composition according to claim 1, wherein the content of 12-hydroxystearic acid is 0.5 to 5% by weight. 3. A lipophilic nonionic surfactant having an HLB of 6
The composition of claim 1 or 2 which is less than. 4. The water-in-oil emulsion composition according to claim 1, wherein the content of the surfactant is 0.5 to 3% by weight. 5. The water-in-oil emulsified composition according to any one of claims 1 to 4, which is used as a cosmetic. 6. The water-in-oil emulsion composition according to claim 1, which further comprises an acylated cholesterol analog as a further essential component. 7. The water-in-oil emulsion composition according to any one of claims 1 to 6, wherein the acylated cholesterol is acetylated lanolin. 8. The water-in-oil emulsified cosmetic composition according to claim 1, wherein the content of the acylated cholesterol analog is 1 to 30% by weight.