JPH08268833A - W/o-type emulsion composition - Google Patents

Abstract

PURPOSE: To obtain an emulsion composition good in emulsion stability, safety and usability, by incorporating an oily phase with ethylhydroxyethyl cellulose. CONSTITUTION: This composition is obtained by incorporating an oily phase with 0.1-20wt.% of ethylhydroxyethyl cellulose as a liposoluble polymer and incorporating an aqueous phase with 0.01-10wt.% of a water-soluble polymer (e.g. carboxymethylcellulose). Besides, the composition is also incorporated, as necessary, with a humectant, a medicine, a UV absorber, an antiseptic agent and an antioxidant. This emulsified composition is prepared by dissolving the ethylhydroxyethyl cellulose in the oily phase and adding the aqueous phase portion to the resultant mixture under agitation followed by dispersing treatment. It is preferable that the weight ratio of the oily phase/the aqueous phase be (5-40%)/(95-60%).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a W / O type emulsified composition, and more particularly, to a W / O type emulsified composition which does not use a conventional surfactant and has good stability, safety and usability. It relates to a composition.

[0002]

2. Description of the Related Art Hitherto, many studies have been conducted on emulsification for the purpose of preparing cosmetics or pharmaceuticals, and many emulsifiers have been developed. In addition, the progress of emulsification technology is remarkable,
Very stable emulsions have been widely used in all industries. However, most of them use nonionic surfactants containing polyoxyethylene chains, anionic surfactants represented by fatty acid soaps, and amphoteric surfactants as emulsifiers, and especially among general consumers. Many are concerned about safety.

Under these circumstances, attempts have recently been made to use a water-soluble polymer, which is considered to be highly safe, as an emulsifier. However, compared with the so-called "surfactants" such as the above-mentioned nonionic surfactants, the water-soluble polymer has a smaller interfacial tension lowering ability, so the emulsifying power is relatively small and the emulsion stability is poor. Further, since the emulsion system was easily destroyed during application, it was not so familiar with the skin and so-called "repellency" was observed.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an emulsion composition having good emulsion stability, safety and usability.

[0005]

As a result of earnest research, the present inventor has found that the above object can be achieved by blending ethylhydroxyethyl cellulose in the oil phase, and has completed the present invention.

That is, the present invention is a W / O type emulsion composition characterized by containing ethylhydroxyethyl cellulose as an oil-soluble polymer in the oil phase. Further, in the present invention, it is preferable to add 0.1 to 20% by weight to the continuous phase.

Further, the present invention is characterized in that, in the W / O type emulsion composition, a water-soluble polymer is blended in an aqueous phase. Moreover, 0.01 to 10% by weight relative to the discontinuous phase
It is preferable to mix them.

[0008]

Next, the structure of the present invention will be described in detail.

Ethyl hydroxyethyl cellulose (hereinafter referred to as EHEC) which is an oil-soluble polymer used in the present invention.
Is abbreviated), in which most of the three hydroxyl groups of cellulose are substituted with ethoxyl groups or ethylhydroxyl groups. EHEC is usually used by dissolving or swelling it in an oil component used in the fields of cosmetics, pharmaceuticals, foods and the like. The blending amount is preferably 0.1 to 20% by weight with respect to the oil phase forming the continuous phase of the W / O type emulsion composition,
1 to 10% by weight is more preferable. Further, methylphenyl polysiloxane is preferable as the dissolving agent.

As the oil component used in the present invention,
For example, beef tallow, squalane, animal and vegetable oils and fats such as olive oil, beeswax, lanolin, waxes such as candelilla wax and hydrocarbons, liquid paraffin, mineral oils such as vaseline, ester oils, silicone oils, higher alcohols,
Fatty acids and the like.

Next, the water-soluble polymer used in the present invention may be any water-soluble polymer which has been conventionally used as a thickener or an emulsion stabilizer, but one which is not easily influenced by salts. preferable. For example, carboxymethyl cellulose (hereinafter abbreviated as CMC) is preferable. The blending amount is preferably 0.01 to 10% by weight, based on the aqueous phase forming the discontinuous phase of the W / O type emulsion composition, and 0.01
-5% by weight is more preferred.

In addition to the above-mentioned essential components, a moisturizing agent, a drug, an ultraviolet absorber, an antiseptic and an antioxidant may be added to the emulsified composition according to the present invention.

The ratio of the oil phase to the water phase can be selected within a wide range, but the oil phase is preferably 5 to 40% and the water phase is preferably 95 to 60%.

The method for obtaining the emulsified composition of the present invention includes:
For example, it can be obtained by dissolving EHEC in an oil component and adding the aqueous phase portion thereto while stirring. in this case,
It is desirable to carry out a homomixer and disper treatment.

[0015]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited to this embodiment.

(Examples 1 to 6, Comparative Examples 1 and 2) (Preparation Method) EHEC, oil, purified water, CMC, carboxyvinyl polymer, etc. were compounded in the composition and amount shown in Table 1 below, and the mixture was heated to 70 ° C. Heat, disperse,
An emulsified composition was prepared.

After observing the condition of the prepared emulsion composition,
It was filled in a glass bottle, left at 50 ° C. for 2 weeks, and then evaluated. The stability was evaluated according to the following three grades.

◯: No separation was observed at all Δ: Slight separation of the oil phase or the water phase was observed ×: Significant separation of the oil phase or the water phase is shown in Table 1. The numbers in the table are% by weight.

[0019]

[Table 1] As shown in Table 1, it can be seen that Examples 1 to 6 using the EHEC according to the present invention have improved stability as compared with Comparative Examples 1 and 2. Further, it can be seen that the one using the water-soluble polymer together is more stable. (Example 7) Moisture cream wt% (A) EHEC 0.5 Methylphenylpolysiloxane 5.0 Glyceryl diisostearate 2.0 Jojoba oil 2.0 Isostearyl alcohol 0.5 Vitamin E acetate 0.5 Preservative 0. 1 Fragrance 0.1 (B) Glycerin 10.0 1,3 Butylene glycol 5.0 CMC-Na 1.0 Hibiswako 105 (Wako Pure Chemical Industries) 0.05 Purified water Residual (production method) (A) phase at 70 ° C It melted uniformly with. Dissolve the water-soluble polymer uniformly in this, and adjust the pH with sodium hydroxide.
The (B) phase adjusted to 6.8 was heated to 70 ° C., gradually added under stirring with a disper, after completion of the addition, a disper treatment was performed at 6000 rpm for 2 minutes, and the mixture was cooled with stirring to obtain Example 7. . The obtained moisture cream had excellent stability over time, had very good spreadability when applied to the skin, and had use characteristics in which "repellency" was not observed. In addition, it was confirmed that there were no safety problems. (Example 8) Night cream wt% (A) EHEC 1.0 Liquid paraffin 2.0 Vaseline 1.0 Methylphenylpolysiloxane 7.0 Glyceryl trioctanoate 5.0 Olive oil 5.0 Cetyl alcohol 0.5 Vitamin E acetate 0.5 Preservative 0.1 Perfume 0.1 (B) Glycerin 5.0 1,3 Butylene glycol 5.0 CMC-Na 2.0 Purified water Residual (production method) (A) phase is uniformly dissolved at 70 ° C. did. A water-soluble polymer was uniformly dissolved in this, and phase (B) heated to 70 ° C. was gradually added under stirring with a disper.
Example 8 was obtained by performing a disper treatment at 00 rpm for 2 minutes and stirring and cooling. The obtained night cream has excellent stability over time, and when applied to the skin, spreads very well,
It had a usage characteristic that "repellency" was not recognized. In addition, it was confirmed that there were no safety problems. (Example 9) Suncare cream wt% (A) EHEC 3.0 Liquid paraffin 3.0 Vaseline 1.0 Methylphenyl polysiloxane 10.0 Jojoba oil 5.0 Octyl methoxycinnamate 10.0 Vitamin E acetate 0 .5 Preservative 0.1 Perfume 0.1 (B) Glycerin 5.0 1,3 Butylene glycol 5.0 CMC-Na 1.0 PEMULEN TR-1 (Nikko Chemicals) 0.05 Purified water Residual Same as Example 7. The obtained sun care cream had excellent stability over time, had very good spreadability when applied to the skin, and had use characteristics in which "repellency" was not observed. In addition, the formulation was also excellent in water resistance and was able to sufficiently exert the effect of the ultraviolet absorber.

[0020]

According to the present invention, it is possible to provide a W / O type emulsion composition having excellent emulsion stability, safety and usability.

Claims (3)

[Claims] 1. A W / O type emulsified composition comprising ethyl hydroxyethyl cellulose incorporated in an oil phase. 2. The W / O type emulsion composition according to claim 1, wherein a water-soluble polymer is mixed in the aqueous phase. 3. The W / according to claim 2, wherein the water-soluble polymer is carboxymethyl cellulose.
O-type emulsion composition.