JP2008094811A - O/w type emulsified composition and its preparing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low viscous, stable cosmetic that contains a large amount of oily components, exhibits excellent moisture retention and gives a fresh feeling upon use without using a special machine such as a high-pressure emulsifier or the like. <P>SOLUTION: The low viscous O/W type emulsified composition, which contains a large amount of oily components though being low viscous, exhibits excellent moisture retention, gives a fresh feeling upon use and is excellently stable, is provided by preparing a non-aqueous emulsified product comprising a polyglycerin fatty acid ester, a polyhydric alcohol and 5-30 wt.% of a liquid oil and further adding thereto an aqueous phase comprising water, a moisturizer and the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an emulsified composition having excellent moisturizing properties, and more particularly to a low-viscosity O / W type emulsified composition excellent in moisturizing effect and stability and a method for adjusting the same.

In order to maintain healthy skin, it is necessary to give appropriate moisture and oil. In cosmetics, in general, two steps are required in which moisture is given by lotion and oil is given by emulsion or cream. However, since it takes time in two steps in a busy morning, there is a demand for one that can provide the effects of lotion and emulsion in one step.

In addition, oil-soluble components are better adapted to the skin than water-soluble components. If a large amount of an oil-soluble effective ingredient can be blended in the skin lotion, it is considered that it is easy to penetrate into the skin because of its fluidity compared to milky lotion and cream. However, when an oil-soluble component is blended in a lotion, it cannot be blended in large quantities due to stability problems. Therefore, cosmetics containing a large amount of oil-soluble components have been limited to dosage forms such as highly viscous emulsions and creams.

In addition, when a large amount of oil is added to the lotion, problems such as separation occur, and it is extremely difficult to commercialize a lotion containing a large amount of oil. Therefore, by adding a polymer or a paste or solid oil, the viscosity is increased to some extent and the stability is improved. However, this does not provide a fresh feeling of use for lotion.

A cosmetic using a polyacrylic acid derivative has been reported as a cosmetic using a polyglycerol fatty acid ester and a polyhydric alcohol and containing a large amount of oil (Patent Document 1). This technology has a high viscosity due to the use of polyacrylic acid derivatives, and there is a problem that a refreshing feeling like lotion cannot be obtained, and in a prescription system in which a polyacrylic acid derivative is not blended in order to reduce the viscosity. There is a problem of poor stability.

Recent technological advances have made it possible to make a stable emulsion by mechanically reducing emulsion particles using a high-pressure emulsifier or the like. However, there is a problem that such machines are very expensive and difficult to scale up.
Japanese Patent Laid-Open No. 2005-220076

The subject of this invention is providing the cosmetics which mix | blend a large amount of oil components and are low-viscosity and stable, without using special machines, such as a high-pressure emulsifier.

As a result of intensive studies in view of the above-described conventional problems, the present inventors made a non-aqueous emulsion in which a polyglycerin fatty acid ester, a polyhydric alcohol, and 5 to 30% by weight of liquid oil were blended, and water and moisturized therein. By adding an aqueous phase comprising an agent or the like, it was found that an emulsion composition having a low viscosity and containing a large amount of oil and having excellent stability can be obtained, and the present invention has been completed.

  The low-viscosity O / W type emulsion composition of the present invention can contain a large amount of oil and is excellent in stability. Therefore, it has a high moisturizing effect and a fresh feeling of use like a skin lotion while having a low viscosity.

Hereinafter, embodiments of the present invention will be described in detail. In the present invention, non-aqueous emulsification is performed using polyglycerin fatty acid ester, polyhydric alcohol, and liquid oil. At that time, the polyglycerin fatty acid ester used in the present invention is preferably a polyglycerin fatty acid ester having a branched chain in the alkyl chain and having a polyglycerin part polymerized in 2 to 10 units, for example, diglyceryl monoisostearate (degree of polymerization 2). ), Pentaglyceryl monoisostearate (degree of polymerization 5), hexaglyceryl monoisostearate (degree of polymerization 6), decaglyceryl monoisostearate (degree of polymerization 10), decaglyceryl diisostearate (degree of polymerization 10), decaglyceryl triisostearate (Degree of polymerization 10), decaglyceryl pentaisostearate (degree of polymerization 10) and the like. And especially the polyglycerol fatty acid ester of the range of HLB7-14 is preferable. Moreover, the polyglycerin fatty acid ester described above can be used in combination of two or more.

Further, the stability is further increased by combining the above-mentioned polyglycerol fatty acid ester having a branched chain with a polyglycerol fatty acid ester having a linear alkyl chain. Examples of polyglycerin fatty acid esters having a linear alkyl chain include decaglyceryl distearate, pentaglyceryl monooleate, hexaglyceryl monooleate, decaglyceryl monolaurate, hexaglyceryl monolaurate, and pentaglyceryl monomyristate. .

And the compounding quantity of polyglyceryl fatty acid ester is 0.5-5 weight%. If it is less than 0.5% by weight, the oil cannot be stably mixed in water, and if it exceeds 5% by weight, it feels sticky. The most desirable blending amount is about 1 to 2.5% by weight.

Examples of the polyhydric alcohol used in the present invention include glycerin, 1,3-butylene glycol, propylene glycol, diglycerin, dipropylene glycol, and isopropylene glycol. Among them, glycerin is the most desirable. By using glycerin, the emulsion can be stabilized even if the blending amount of the polyglycerin fatty acid ester is small, so that a non-sticky cosmetic can be obtained. In the present invention, the blending amount of the polyhydric alcohol is 1 to 30% by weight. In order to carry out non-aqueous emulsification, 1% by weight is necessary, and when it exceeds 30% by weight, a feeling of sliminess or stickiness may be a concern, which may adversely affect the feeling of use.

The liquid oil used in the present invention is liquid at room temperature, and the following can be exemplified. Hydrocarbon oils such as squalane, liquid paraffin, ester oils such as cetyl octanoate, myristyl myristate, octyldodecyl myristate, cetyl isooctanoate, methyl polysiloxane, methyl phenyl polysiloxane, methyl hydrogen polysiloxane, dimethyl polysiloxane, etc. Chain silicone, crosslinked silicone such as crosslinked methylpolysiloxane, crosslinked methylphenylpolysiloxane, cyclic silicone such as decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, methylcyclosiloxane, avocado oil as other oils, Camellia oil, macadamia nut oil, olive oil, sesame oil, wheat germ oil, safflower oil, soybean oil, jojoba oil, egg yolk oil, peanut oil, flaxseed oil, turtle oil, rapeseed oil, cottonseed oil, Seed oil, rice bran oil, sasanqua oil, corn oil, kaya oil, evening primrose oil, perilla oil, palm oil, and the like palm oil. These oils can be used in combination of two or more. The present invention is not limited to the above oil.

The blending amount of the liquid oil used in the present invention is preferably 5 to 30% by weight. To blend more than 30% by weight, a large amount of polyglycerin fatty acid ester is required, a sticky feeling is generated, and a lotion having a poor feeling in use. Become. In addition, if it is less than 5% by weight, it is difficult to suppress moisture transpiration and a high moisturizing effect cannot be obtained, and the useful feeling of use of an oil-soluble component cannot be obtained, and the effects of the present invention can be sufficiently obtained. There may not be.

Next, the present invention will be described in detail with specific examples. The present invention is not limited to these examples. In the following formulation examples, the compounding amounts are all expressed in weight%.

Table 1 shows the formulations of the examples of the present invention, and Table 2 shows the formulations of the comparative examples.

[Production method]
While applying a mixed liquid of glycerin and polyglycerin fatty acid ester heated to 80 ° C. to a disper mixer, squalane heated to 80 ° C. is gradually added to perform non-aqueous emulsification. The remaining components heated to 80 ° C. are gradually added while the non-aqueous emulsion is applied to a disper mixer.

[Sensory evaluation method]
1. Sensory evaluation items (1) Moist feeling immediately after application, (2) Stickiness, (3) Freshness were carried out.
2. Evaluation method Using the lotions prepared in the examples shown in Table 1 and the comparative examples shown in Table 2, a method in which samples were randomly used by five functional panelists was used. After washing the face, an appropriate amount of the sample was applied to the face, and self-scoring was performed in 5 steps for 3 items of moist feeling, stickiness, and freshness for evaluation. And the average of 5 persons was divided into 4 grades, and the evaluation values were taken. Table 3 shows the evaluation contents.

The stability was evaluated in a period when the sample was put into a 60 ° C. incubator and not separated. Those that were stable for 1 week were marked as ◎, those that were stable for 3 days, ○ that were stable for 1 day, and Δ that were separated within 1 day.

As is apparent from the results of Tables 1 and 2, Examples 1 to 6 of the present invention were found to be extremely excellent in stability as compared with Comparative Examples 1 to 6. In addition, the use feeling of the example was less sticky than the comparative example, and an excellent use feeling having a moist feeling and freshness was obtained.

The particles of the emulsion of the examples have a median diameter of 133.5 nm to 357.0 nm, and it is possible to prepare an emulsion having a small particle diameter of 1 μm or less without using a high-pressure emulsifier. It was also confirmed that the particle size distribution was not broad but limited to a relatively narrow range.

The low-viscosity O / W type emulsion composition of the present invention has a low viscosity and can contain a large amount of oil, has a high moisturizing effect, provides a fresh feeling to use, and is excellent in stability. Can be widely applied to cosmetics.

Claims (5)

A low-viscosity liquid cosmetic comprising a polyglycerin fatty acid ester, a polyhydric alcohol, and 5 to 30% by weight of a liquid oil, and having a viscosity of 50 mPa.s or less. 2. The cosmetic according to claim 1, wherein the alkyl chain of the polyglycerol fatty acid ester is a branched chain, and the polyglycerol part is polymerized in 2 to 10 parts. 3. The cosmetic according to claim 1, wherein the blending ratio of the polyglycerin fatty acid ester is 0.5 to 5% by weight. 4. The cosmetic according to claim 1, wherein the blending amount of the polyhydric alcohol is 1 to 30% by weight. The cosmetic according to any one of claims 1 to 4, wherein the cosmetic is prepared by a non-aqueous emulsification method, and the emulsified particles are 1 µm or less.