JPS61133138A - Emulsion composition - Google Patents

Abstract

PURPOSE:To improve the emulsibility and the use feeling by blending cyclodextrin, oily component, aq. medium and sodium carboxymethyl cellulose of 0.60-0.85 degree of etherification to produce the emulsion composition. CONSTITUTION:An aq. medium such a purified water is slowly heated and sodium carboxymethyl cellulose (Na-CMC) of 0.60-0.85 degree of etherification is uniformly dispersed therein. After cyclodextrin is added thereto and dissolved, oily composition is added and emusified at about 50-80 deg.C to obtain the emulsion composition. The bended quantity of Na-CMC is suitably about 1.5-3.3wt.% for the whole compositions. Each of alpha-,beta-, and gamma-cyclodextrin can be used as cyclodextrin and lanolin, bees wax, whale wax and olive oil, etc., are shown as the oily component.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to emulsifying compositions, and more particularly to emulsifying compositions obtained without the use of surfactants.

BACKGROUND ART Conventionally, creams, milky lotions, etc., which are emulsified various oil-based and aqueous raw materials, have been widely used as cosmetic emulsified compositions. In producing such an emulsified composition,
In addition to processing the raw materials under various strictly set conditions, it was also essential to use surfactants.

However, in recent years, the level of safety requirements for cosmetics has become even stricter, and the problem of skin disorders in particular has become a hot topic, and the presence of surfactants as a causative agent has been brought into question. For this reason, methods for obtaining cosmetic emulsions without using surfactants have also been proposed. For example, JP-A-55-11527 proposes an emulsified cosmetic whose essential components are an oil-based raw material for cosmetics, an aqueous raw material, a water-soluble polymer compound, and cyclodextrin.

However, when such cosmetics are actually applied to human skin, the oil-based ingredients appear to float, and the feeling of use is significantly inferior to that of conventional cosmetics that use surfactants. .

Purpose of the Invention Therefore, as a result of repeated studies to solve the above-mentioned problems, the present inventors found that the emulsifying property and the feeling of use can be improved by blending sodium carboxymethyl cellulose with a specific degree of etherification. I was able to complete it.

That is, the purpose of the present invention is to
It is to impair the emulsion composition with good emulsion stability,
Yet another object is to provide an emulsion composition with good emulsion stability that provides a pleasant feel when applied to the actual skin without using a surfactant.

Summary of the Invention Namely, the present invention provides cyclodextrin, an oily component, an aqueous medium, and sodium carboxymethyl cellulose (hereinafter referred to as Na-CM) having a degree of etherification of 0.60 to 0.85.
The present invention provides an emulsified composition containing a compound (referred to as C).

In the detailed description of the invention, it is essential to use Na-CMC,
In particular, Na-CMC with a constant degree of etherification is used. When other water-soluble polymers such as locust bean gum, carrageenan, xanthan gum, methylcellulose, hydroxyethylcellulose, polyvinyl alcohol, polyvinylpyrrolidone, and bentonite are used, the emulsion stability is poor or the usability is poor. Undesirable.

The degree of etherification of Na-CMC used in the present invention needs to be in the range of 0.60 to 0.85.

If the degree of etherification is outside this range, emulsion stability or feel in use will deteriorate.

In addition, the amount of Na-CMC to be added to the entire composition is as follows:
Preferably, it is 1.5 to 363% by weight. If it is less than 1.5% by weight, emulsion stability will deteriorate, while if it exceeds 3.3% by weight, the feeling of use when used as a cosmetic product will be unfavorable.

The cyclodextrin used in the present invention is not particularly limited. Cyclodextrin is composed of d-glucose linked in a cyclic manner through α-1,4 bonds, and the 6-bonds are α-cyclodextrin,
Seven of them are β-cyclodextrin, and eight of them are γ-cyclodextrin. In the present invention, α, β
, γ-cyclodextrin can be used.

As the oily component used in the present invention, both polar and non-polar components that are commonly used in cosmetics can be used, such as lanolin, beeswax, spermaceti, olive oil, castor oil, safflower oil, vaseline, and isoprobil. Ral-
and octyldodecyl myristate, squalane, lecithin, isopropyl myristate, isocetyl stearate, mink oil, cetanol, liquid paraffin, and the like.

Purified water is generally used as the aqueous medium.

Furthermore, appropriate oils and fats, higher alcohols, preservatives, fragrances, pigments, and the like may be added to the emulsion composition of the present invention, as necessary, to the extent that they do not impair emulsion stability or usability.

To prepare the emulsion composition of the present invention, for example, a water-soluble raw material is gradually heated, Ha-CMC is uniformly dispersed therein, and then β-cyclodextrin is added and dissolved therein. Next, oily raw materials were added to this at about 50 to 80°C,
Perform emulsification.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. In addition, % means all weight %. Examples 1 to 12 Cosmetic emulsions were manufactured using the following formulation compositions.

Ingredients Amount (%) Liquid paraffin 15β-cyclodextrin 5Na-CMC (thickener)
Glycerin listed in Table 1
5 Preservatives Appropriate amount of fragrance
Tekurbo purified water
To produce the remaining emulsion, first, purified water and glycerin are gradually heated to 50°C, and Na-
Distribute the CMC. After Ha-CMC is uniformly dispersed, β-cyclodextrin is added and dissolved. Then, liquid paraffin was added at 70±2°C and emulsification was carried out for 15 minutes. After cooling to 45°C, preservatives and fragrances are added, and the mixture is further cooled to 28°C to obtain an emulsion.

The obtained emulsion was evaluated for emulsion stability (40° C., 2 month device) and feeling of use. The results are also shown in Table 1.

The evaluation criteria are as follows.

Emulsion stability (40℃, 2 months) O...No problem ×...Oil-based components are separated in the upper layer, or water-based components are separated in the lower layer Usability ○...No problems as a cosmetic ×...As a cosmetic Comparative Example with Problems in Usage Feeling [~25] A cosmetic emulsion was produced in the same manner as in Example 1 using the following formulation.

Ingredients Amount (%) Liquid paraffin 15β-cyclodextrin 5 Thickener
Glycerin listed in Table 1 5 Preservatives Appropriate amount Flavoring
Appropriate amount of purified water
The remaining results are shown in Table 1 in the same manner.

*+ As is clear from Table 1, when Na-CMC with a degree of etherification of 0.60 to 0.85 is used as a thickener, it has excellent emulsion stability and feeling of use. Although an emulsified composition is obtained, both emulsion stability and usability cannot be satisfied if other water-soluble polymers are used as thickeners or if the degree of etherification is outside the above range. Further, the amount of Na-CMC blended is preferably 1.5 to 3.3%.

Example 7 Example according to the following composition! A cosmetic emulsion was produced using the same method.

Ingredients Amount (%) Squalane 20α-cyclodextrin 3Na -CMC2 (degree of etherification 0.85) ・■-3, Butylene glycol 8 Preservative
Appropriate amount of fragrance
Appropriate amount of purified water
The remaining emulsion had excellent emulsion stability and had a good feel when used.

Claims (2)

[Claims] (1) An emulsified composition comprising cyclodextrin, an oily component, an aqueous medium, and sodium carboxymethylcellulose having a degree of etherification of 0.60 to 0.85. (2) The amount of carboxymethylcellulose sodium is 1.5 to 3.3% by weight based on the total weight of the composition.
The emulsified composition according to item (1) above.