JPH07532B2 - Multi-phase emulsion cosmetics - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-phase emulsified cosmetic having a perfluoroorganic compound phase / oil phase / water phase type (hereinafter abbreviated as F / O / W type) dispersion state. Regarding fees.

More specifically, the present invention relates to a novel multiphase emulsified cosmetic composition having excellent storage stability, skin safety and spreadability, detergency, water resistance and other practical properties.

(Prior Art) Japanese Patent Application Laid-Open No. 57-21812 discloses a perfluoro organic compound phase / water phase type (hereinafter abbreviated as F / W type) dispersion state in which a perfluoro organic compound is dispersed and emulsified in water. A breathable ointment which is an emulsified composition to be presented has been proposed. But,
This emulsion composition was inferior in storage stability and skin safety and poor in practical use.

DISCLOSURE OF THE INVENTION The present inventor has diligently studied an emulsion composition containing a perfluoroorganic compound, which sufficiently exhibits various properties such as spreadability, detergency and water resistance, which are excellent properties of the perfluoroorganic compound. As a result, the cosmetic composition comprising a multi-phase emulsion type composition exhibiting a specific F / O / W type dispersion state described later has these characteristics, and is further excellent in storage stability and skin safety. Therefore, the present invention has been completed.

(Object of the Invention) That is, the object of the present invention is to provide a multi-phase emulsion cosmetic which is excellent in practical properties such as storage stability, skin safety and spreadability, detergency, and water resistance.

(Structure of the Invention) The present invention comprises: (a) dissolving a fluorosurfactant having a perfluorocarbon group and a hydrocarbon group in the molecule in an oil component, and (b) dispersing and emulsifying a perfluoroorganic compound therein. To obtain a perfluoroorganic compound type emulsion in oil, and (c) to obtain a perfluoroorganic compound phase / oil phase / water phase type dispersed state obtained by dispersing and emulsifying this emulsion in an aqueous solution of a water-soluble emulsifier. It is a multi-phase emulsion cosmetic.

(Specific Description of Structure) The oil component used in the present invention is a known cosmetic oily substance, and examples thereof include fats and oils, waxes, hydrocarbons, ester oils, higher alcohols and higher fatty acids.

Examples of fats and oils include castor oil, olive oil, avocado oil, palm oil, cocoa oil, etc., examples of wax include wood wax, lanolin, beeswax, carnauba wax, candelilla wax, etc., and examples of hydrocarbons include petrolatum, fluid. Ester oils such as paraffin, solid paraffin, ceresin, microcrystalline wax, squalane, etc. include stearic acid butyl ester, myristic acid octyldodecyl ester, myristic acid isopropyl ester, lanolin fatty acid isopropyl ester, stearic acid butyl ester, lanolin hexyl ester. Examples of higher alcohols include stearyl alcohol, oleyl ester, oleic acid oleyl ester, adipic acid diisopropyl ester, sebacic acid diisopropyl ester, etc. Call, as the higher fatty acids, for example, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, lanolin fatty acids, and the like, not limited thereto. These oil components may be used alone or in combination of two or more, depending on the type of cosmetics and the purpose thereof. The blending amount is
Usually based on the total weight of the final composition of the cosmetic
10 to 70% by weight.

The perfluoroorganic compound used in the present invention has 6 to 20 carbon atoms and all hydrogen atoms are replaced with fluorine atoms. For example, perfluorodecalin, perfluoroadamantane, perfluorobutyltetrahydrofuran, perfluorooctane, perfluorononane, perfluoropentane, perfluorodecane, perfluorododecane, and tetrafluoroethylene oxide polymer (degree of polymerization 3-10). , Hexafluoropropylene oxide polymer (polymerization degree: 3 to 10) and the like are applied, but the invention is not limited thereto.

These perfluoro organic compounds are used by selecting one kind or two or more kinds according to the kind of cosmetics and the purpose thereof. The blending amount thereof is usually 2 to 15% by weight based on the total weight of the final composition of the cosmetic, and usually 5 to 40% by weight for the F / O type emulsion described later.

The fluorine-based surfactant used in the present invention is a known compound having a perfluorocarbon group and a hydrocarbon group in the molecule. It is preferable that the total number of carbon atoms of the fluorine-based surfactant is 10 to 80 and that the relationship of carbon number of hydrocarbon group ≧ 2 × (carbon number of perfluorocarbon group) is satisfied. When the carbon number exceeds 30, the solubility and emulsification are poor, and when the total carbon number is less than 10, skin irritation is likely to occur. If the number of carbon atoms in the perfluorocarbon group exceeds 1/2 of the number of carbon atoms in the hydrocarbon group, a stable F / O type emulsion cannot be obtained, which is not preferable. Table 1 shows examples of these fluorine-based surfactants. One type or two or more types of fluorosurfactants are selected and used according to the dosage form of the cosmetic of the present invention.

The blending amount is usually 0 based on the total weight of the cosmetic.
5 to 3% by weight, usually 1 to F / O emulsion
10% by weight.

As the water-soluble emulsifier used in the present invention, a value of a predetermined hydrophilicity-lipophilicity ratio (hereinafter, simply referred to as “HLB”) that forms an O / W type emulsion with the oil component is calculated from the Griffin equation. , Use an emulsifier with an HLB value corresponding to this value. Examples of water-soluble emulsifiers include polyoxyethylene sorbitan monolaurate (20E.O adduct), polyoxyethylene sorbitan monopalmitate (20E.O),
Polyoxyethylene sorbitan monooleate (20E.
O), polyoxyethylene glyceryl monooleate (1
5E.O), polyoxyethylene monolaurate (30E.
O), polyoxyethylene monostearate (40E.O),
Nonionic surfactants such as polyoxyethylene lauryl ether (21E.O) and polyoxyethylene cetyl ether (20E.O), potassium stearate, sodium N-acyl sarcosine, sodium N-acyl glutamate, sodium cetyl Examples thereof include anionic surfactants such as sulfate, but are not limited thereto.

These water-soluble emulsifiers are used alone or in combination of two or more, depending on the type of cosmetics, the purpose thereof and the like. The blending amount is usually 1 to 5% by weight based on the total weight of the final composition of the cosmetic.

Further, the aqueous solution of the water-soluble emulsifier is preferably a solution obtained by dissolving the water-soluble emulsifier in deionized purified water treated with an ion exchange resin or distilled water. The amount of this aqueous solution is preferably in the range of 20 to 85% by weight based on the total weight of the cosmetic.

Next, a method for producing an F / O / W type multi-phase emulsion cosmetic using the above components will be described.

First, an in-oil perfluoroorganic compound type (hereinafter abbreviated as F / O type) emulsion is prepared from the oil component and the perfluoroorganic compound. After the fluorine-based emulsifier was dissolved in the oil component, a predetermined amount of perfluoroorganic compound was added to this solution and stirred, so that the oil component became a continuous phase (dispersion medium) and the perfluoroorganic compound became a dispersoid.
An F / O emulsion is produced. In this case, it is preferable to dissolve the fluorine-based emulsifier in the oil component or to heat the solution while adding the perfluoroorganic compound to the solution, and to heat the solution, for example, at a predetermined temperature of about 60 ° C to 80 ° C. Perform the operation. A homomixer is used for stirring.

Next, the above-mentioned F / O type emulsion is added to the above-mentioned aqueous solution of the water-soluble emulsifier to produce a multi-phase emulsion cosmetic which is an F / O / W type emulsion. In this case, it is preferable to heat the aqueous dispersion or F / O type emulsion of the water-soluble emulsifier,
For example, gently stir the aqueous solution of the water-soluble emulsifier heated to 60 to 80 ° C with a homomixer, etc., and add the F / O type emulsion preheated to 70 to 80 ° C for a certain period of time to perform emulsification with stirring, An F / O type emulsion in which a perfluoroorganic compound is dispersed and emulsified in an oil phase is used as a dispersoid, and this F / O type emulsion converts an aqueous phase into a dispersion medium (continuous phase).
To produce a stable F / O / W type emulsion emulsified as.

The storage stability of the multi-phase emulsion type cosmetics prepared by dispersing the F / O / W type emulsion of the present invention as described above is very good. For example, it is stored for one month at a severe condition temperature of 45 ° C. However, this emulsion was hardly broken, and there was almost no difference in the emulsion state between immediately after preparation and after storage for 1 month. This is because the surface tension of water is 72 dynes / cm, whereas that of oil is usually 20 to 40 dynes / cm and that of perfluoroorganic compounds is 10 dynes / cm.
As in the present invention, first an F / O type emulsion is prepared, and then F
It is considered that the perfluoro organic compound is more stably emulsified by preparing the / O / W emulsion.

Furthermore, since the perfluoroorganic compound is dispersed in the oil component, the cosmetic of the present invention is excellent in skin safety and effectively embodies various properties of the perfluoroorganic compound.

INDUSTRIAL APPLICABILITY The multiphase emulsion cosmetic of the present invention is applied to many other milky liquid or creamy cosmetics such as skin creams, massage creams, cleansing creams, hair creams, makeup bases, hand creams and the like.

In addition to the above, a colorant, a fragrance, an antiseptic, a pigment, an antioxidant and the like can be appropriately added to the skin cosmetic of the present invention within a range that achieves the object of the present invention.

(Example) Hereinafter, the present invention will be described in detail based on Examples and Comparative Examples.

The tests relating to practical properties such as storage stability, skin safety and spreadability, detergency, and water resistance described in Examples are as follows.

(1) Storage stability test Place the sample in a constant temperature bath at 45 ° C and observe the emulsified state and appearance after standing for 3 months. If no abnormality is observed (emulsion state is uniform and homogeneous emulsion is formed). If there is an abnormality (when the oil separates, when the particles become coarse, etc.), it is regarded as bad.

(2) Skin safety test A sample of 0.05g was put on the forearm flexor lateral skin of 25 subjects with a diameter of 1.0cm.
After applying the patch test adhesive bandage with the circular lint cloth for 24 hours by applying the patch, the skin condition of 25 test subjects was evaluated for each sample according to the following criteria. As the determination result, the one with the strongest reaction was used after 1 hour and 24 hours after the removal of the plaster, and the evaluation was shown by the number of persons with (±) or more.

(3) Practical characteristics test Twenty test subjects used the sample for 10 days, and then the characteristics of the sample were evaluated.

The test results show that for each of the items of spreadability, cleanability, and water resistance, "good spreadability (spreading) when applying the sample", "good sample washability", "good water resistance of the sample ( It is indicated by the number of respondents who answered "small".

Example 1 (skin cream) (2) Manufacturing method The components heated to 60 ° C and uniformly dissolved are added to the components heated to 60 ° C while stirring with a homomixer to disperse and emulsify to obtain an F / O type emulsion.

Next, add the F / O emulsion obtained above to the components that were uniformly heated by heating to 60 ° C while slowly stirring with a homomixer, cool to room temperature, and cool to F / O / W.
A type emulsion was obtained.

(3) Characteristics Table 2 shows the test results relating to various characteristics.

As shown in Table 2, the skin cream of Example 1 of the present invention is excellent in storage stability, skin safety and practical spreadability. In addition, since perfluorodecalin in the component volatilizes with time after being applied to the skin, it was confirmed that it was a refreshing skin cream with little sealing feeling.

Comparative Example 1 (Skin Cream) The skin cream of Comparative Example 1 was obtained by the same method as in Example 1 except that the formulation was as follows.

(1) Manufacturing method Separately add the components uniformly dissolved at 60 ° C to the components uniformly heated and dissolved at 60 ° C, stir uniformly with a homomixer, and then cool to room temperature.

(2) Properties As shown in Table 2, the emulsion prepared without forming the F / O type emulsion was inferior in storage stability and skin safety.

Comparative Example 2 (skin cream) (1) Production method O / W type of Comparative Example 2 was carried out in the same manner as Comparative Example 1 except that 10.7% by weight of perfluorodecalin and 43.7% by weight of MOD were blended in place of 33% by weight of MOD. I got a skin cream.

(2) Properties As shown in Table 2, the skin cream containing no perfluoroorganic compound was not only poor in spreadability but also had a tight seal Example 2 (skin cream) (1) Manufacturing method: Instead of 0.75% by weight of perfluoropentyldecalin and 0.75% by weight of perfluorohexyl lauryl ether, 1.5% by weight of perfluoropropylpentane is blended,
A skin cream was obtained in the same manner as in Example 1.

(2) Properties As shown in Table 2, a skin cream using a fluorine-based emulsifier having a total carbon number of 10 is slightly inferior in skin safety, but has no practical problem.

Example 3 (skin cream) (1) Manufacturing method The same as in Example 1 except that perfluoropentanedecalin (0.75% by weight) and perfluorohexyllauryl ether (0.75% by weight) were replaced with perfluorononane octadecane (1.5% by weight). I got a skin cream.

(2) Properties As shown in Table 2, a skin cream using a fluorine-based emulsifier in which the number of carbon atoms in the hydrocarbon group is twice the number of carbon atoms in the perfluorocarbon group has good storage stability and skin safety. It had excellent spreadability and had a refreshing feel.

Example 4 (cleansing cream) (2) Manufacturing Method By the same manufacturing method as in Example 1, the cleansing cream of the present invention was obtained.

(3) Properties As shown in Table 2, it was confirmed that the practical properties such as storage stability, skin safety, spreadability and detergency were excellent.

Example 5 (hand cream) (2) Manufacturing method The hand cream of the present invention was obtained by the same manufacturing method as in Example 1.

(3) Properties As shown in Table 2, it was confirmed that the hand cream of the present invention had excellent storage stability, skin safety, spreadability, water resistance, and a feeling of being less sticky.

Example 6 (hair cream) (2) Manufacturing method A hair cream of the present invention was obtained by the same manufacturing method as in Example 1.

(3) Properties As shown in Table 2, excellent storage stability, skin safety and spreadability, good combability when applied, and water resistance,
Practical properties excellent in hair styling were recognized.

(Effects of the Invention) As described above, the present invention can provide a useful multi-phase emulsion cosmetic which is excellent in practical properties such as storage stability, skin safety and spreadability, detergency, and water resistance. it is obvious.

Claims (1)

[Claims] (1) A fluorosurfactant having a perfluorocarbon group and a hydrocarbon group in the molecule is dissolved in an oil component, and (b) a perfluoroorganic compound is dispersed and emulsified therein to obtain a perfluorocarbon compound in the oil. A fluoroorganic compound type emulsion is obtained, and (c) a multiphase emulsification type which exhibits a perfluoroorganic compound phase / oil phase / water phase type dispersion state obtained by dispersing and emulsifying this emulsion in an aqueous solution of a water-soluble emulsifier. Cosmetics.