JPH07528B2 - Emulsified cosmetics - Google Patents

Description

TECHNICAL FIELD The present invention relates to an oil phase / water phase type (hereinafter, referred to as O / W type) mixture of dextrin fatty acid ester, a specific bentonite described below, an oily substance, and water. And a water phase / oil phase type (hereinafter abbreviated as W / O type) dispersion state.

More specifically, it relates to an emulsified cosmetic composition having excellent storage stability, skin safety and practical properties (spreadability, viscosity, moisture retention, water resistance) and the like.

(Prior Art) Conventionally, various thickeners (gelling agents) have been used to improve the storage stability of O / W type or W / O type emulsion compositions.

For example, as the water-soluble thickener, bentonite, bee gum, xanthan gum, pectin, carrageenan, hydroxypropyl cellulose and the like are applied, and as the oil-soluble thickener, organic bentonite, sucrose fatty acid ester,
Dextrin fatty acid ester and the like are known.

However, the emulsion composition prepared by blending these thickeners alone is not sufficient in storage stability, and in addition, an anionic composition,
It was essential to use nonionic and cationic surfactants together in high concentration. Further, in the case of an emulsified cosmetic in which an emulsified composition containing a high concentration of this surfactant is applied as a base of a cosmetic, in practical characteristics,
(A) “Elongation” (spreadability) is poor, (b) “Stickiness”, “slickness” (poor consistency), (c) Poor water resistance, and makeup deterioration due to sweating It is not always satisfactory because it has various drawbacks such as easyness and poor skin safety.

(Disclosure of the Invention) Therefore, the inventors of the present invention have conducted diligent research on emulsified cosmetics containing various thickeners, and as a result, a dextrin fatty acid ester (hereinafter abbreviated as DFE), and bentonite having the characteristics described later, The present inventors have found that an O / W type or W / O type emulsion type cosmetic composition prepared by mixing an oily substance and water can solve the above problems, and completed the present invention.

(Object of the invention) That is, the object of the present invention is O / excellent in storage stability, skin safety and practical properties (spreadability, viscosity, moisture retention, water resistance)
To provide W type or W / O type emulsion cosmetics.

(Structure of the Invention) The present invention is an oil phase / water phase type or water phase mixture prepared by mixing dextrin fatty acid ester, bentonite containing at least 100 mg equivalent / 100 g of cation-exchangeable sodium ions, an oily substance, and water. It is an emulsion type cosmetic of phase / oil phase type.

(Detailed Description of Structure) DFE used in the present invention is a known substance, and is disclosed in JP-A-52-2.
Japanese Patent No. 5039 describes a method for producing DFE and its characteristics.

That is, DFE is an esterified product of dextrin and higher fatty acid having an average degree of polymerization of 10 to 50 glucose units, and the degree of substitution thereof is preferably 1.0 or more per glucose unit.

For example, as the esterification product with higher saturated fatty acid, dextrin palmitate ester, dextrin stearic acid ester, dextrin palmitate stearic acid ester, etc., and as esterification product with unsaturated or side chain higher fatty acid, dextrin oleic acid Esters, dextrin isopalmitate, dextrin isostearate and the like can be mentioned, and one or more of them can be used.

In the present invention, particularly, DFE (hereinafter abbreviated as S-DFE) which is an esterified product with the above-mentioned higher saturated fatty acid.
And DFE (hereinafter abbreviated as L-DFE), which is an esterified product of unsaturated or side chain higher fatty acid, in combination, may exhibit excellent properties in the tests described below. Admitted.

The compounding amount of DFE is 0.2-5 based on the total amount of the cosmetic.
0 wt% (hereinafter abbreviated as wt%) is preferable. 0.2 wt%
When it is less than 5.0 wt%, the storage stability is poor, and when it exceeds 5.0 wt%, the practical properties such as the appearance and viscosity of the dosage form are deteriorated.

The bentonite used in the present invention is sodium montmorillonite which is a kind of natural colloidal hydrous aluminum silicate, and has a cation exchangeable sodium ion content (Experimental Agricultural Chemistry, vol. 1, p. 59-62, Asakura. Bookstore, Showa
(Issued in 1939) is 100 to 160 mg equivalent / 100 g, and the viscosity of this 4.0 wt% aqueous dispersion of bentonite is 150 to 800 centipoise (B type rotational viscometer, measured 20
C.) is preferred.

This high-purity sodium montmorillonite is obtained from specific veins or by special physical or chemical treatment.

For example, bentonite produced in the Omachi region of Yamagata Prefecture is separately purified to obtain bentonite showing various cation-exchangeable sodium ion contents, and as described below, an O / W type or W / O type emulsion type cosmetic composition. As a result, the content of cation-exchangeable sodium ions was high, and the value was 100 to 1
60 mg equivalent / 100 g of bentonite [below, bentonite (N
a: 100 to 160)] is excellent in water swellability,
It was clearly recognized that a small amount of the compound enhances the viscosity of the aqueous component and improves various properties such as storage stability of the emulsion cosmetic.

Incidentally, bentonite showing various cation-exchangeable sodium ion contents used in the section of Examples described later and its 4.0w
The viscosity of the t% aqueous dispersion is as follows.

The blending amount of the above bentonite is preferably 0.05 to 5.0 wt% based on the total amount of the cosmetic. 0.05wt%
If it is less than 5.0%, the storage stability is not sufficient, and 5.0 wt%
If it exceeds, the appearance characteristics and practical characteristics of the dosage form deteriorate.

The DFE and bentonite (Na: 100 to 160) blended in the emulsion cosmetic of the present invention increase the viscosity of the oil phase component and the aqueous phase component, respectively, and improve the interfacial viscosity of the dispersed particles by a synergistic effect. It was presumed that not only the storage stability but also the excellent various properties which were not expected in the past are imparted.

The oily substance used in the present invention is a known oily raw material for cosmetics, and examples thereof include fats and oils, waxes, hydrocarbons, ester oils, higher alcohols, and higher fatty acids.

These oily substances are applied by selecting one kind or two or more kinds according to the kind of cosmetics, the dosage form and the purpose thereof.
The amount is usually 10 to 10 based on the total amount of the cosmetic.
It is 70 wt.

Further, the water is purified water that is usually used, deionized purified water treated with ion exchange resin or distilled water, etc. is applied, the blending amount is 20 ~ 85 wt% based on the total amount.
% Is preferable.

Furthermore, it was confirmed that the emulsified cosmetic composition of the present invention has more excellent various properties by blending xanthan gum in an amount of 0.1 to 2.0 wt% based on the total amount.

In the emulsion cosmetic of the present invention, in addition to the above, ordinary cosmetic raw materials such as surfactants, fragrances, preservatives, moisturizers, pigments, dyes, etc. are used to achieve the object of the present invention. It can be appropriately blended within the range.

The emulsion cosmetic of the present invention is a skin cream, a skin emulsion, a massage cream, a cleansing cream,
It is applied to many other milky or creamy cosmetics such as hair cream, makeup base, hand cream, etc.

(Examples) Hereinafter, the present invention will be described with reference to Examples.

The test methods for storage stability, skin safety and practical properties described in the examples are as follows.

(1) Storage stability test After the sample was stored in a thermostatic chamber at 45 ° C for 3 months, the appearance and the emulsified state of the sample were observed, and if no abnormality was observed (the emulsified state and particles were uniform), When the result was good, and abnormalities were observed (when the oil was separated, when the particles became coarse, etc.), the result was regarded as poor.

(2) Skin safety test Twenty-five subjects had skin on the flexion side of the forearm and 0.05 g of the sample had a diameter of 1.0
After applying the patch test adhesive bandage with a cm-shaped circular lint cloth for 24 hours, 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 Property Test (Spreadability, Viscosity, Moisture Retention, and Water Resistance) After 20 subjects continuously used the sample for 10 days, the properties of the sample were evaluated.

The test results are “good elongation at application”, “no sticky or slimy feeling”, and “moisturized skin” for test items of spreadability, viscosity, moisture retention, and water resistance. , "There is little makeup damage or hair disorder due to sweat"
The number of people who answered

Examples 1 to 6 and Comparative Examples 1 to 4 [O / W type skin creams] Various O / W type skin creams having the compositions shown below are blended as shown in Table 1. Was prepared and the above-mentioned tests were carried out.

(1) Composition In Comparative Example 1, the amount of POE sorbitan monooleate (20EO) as the component (B) was increased to 3.5 wt%, and in the component (C), in addition to the above table, sodium salt of cetyl alcohol sulfate ester was added.
0.5 wt% was added and compounded. In addition, in Example 5, 0.5 wt% of xanthan gum was added to the component (C) and blended.

(2) Preparation method Among components (A), DFE is mixed in the component (B), other components are mixed in the component (C), and the components (B) and (C) are each heated to 80 ° C. It melted by heating. Next, the components (B) and (C) were mixed and cooled to 30 ° C. with stirring to prepare each skin cream.

(3) Characteristics As shown in Table 1, Comparative Example 1 containing a surfactant at a high concentration has good storage stability, but it does not give favorable results in skin safety and practical characteristics. In addition, Comparative Example 2 containing bentonite (Na: 70) having a low cation-exchangeable sodium ion content and bentonite (N
a: 120) or DFE alone, respectively, Comparative Examples 3 to 4
Was clearly inferior in storage stability.

Examples 1 to 6, which are emulsion cosmetics of the present invention, show excellent properties in all of the tests, and in particular, Example 5 containing xanthan gum and Example containing L-DFE and S-DFE. 6
Had good storage stability over a long period (6 months).

Examples 7 to 11 and Comparative Examples 5 to 8 [W / O type hand cream] Similar to Example 1, each W / O type hand cream was prepared with the following composition, and various tests were conducted.

(1) Composition In Comparative Example 5, the amount of sorbitan sesquioleate as the component (B) was increased to 5.0 wt%, and in the component (C), 3.5 wt% of calcium stearate was added in addition to the above table.
Further, in Example 6, xanthan gum was added to the component (C).
0.5 wt% was added.

(3) Properties As shown in Table 2, Comparative Example 5 in which a surfactant is blended at a high concentration has good storage stability, but it does not give favorable results in skin safety and practical properties. In addition, Comparative Example 6 containing bentonite (Na: 70) having a low cation-exchangeable sodium ion content and bentonite (N
a: 120) or DEF alone, Comparative Examples 7 to 8
Was clearly inferior in storage stability.

Examples 7 to 11, which are emulsion cosmetics of the present invention, show excellent characteristics in all of the tests, and in particular, Examples 10 and 11 have good storage stability over a long period (5 months). was gotten.

Examples 12 to 13 and Comparative Example 9 [O / W-type makeup base] In the same manner as in Example 1, each O / W-type makeup base having the following composition was prepared and various tests were conducted.

(1) Composition In Example 13, xanthan gum was added to the component (C) in an amount of 0.
5 wt% was added.

(3) Properties As shown in Table 3, Comparative Example 9 containing cation-exchangeable bentonite (Na: 70) having a low sodium ion content was obviously inferior in storage stability.

The emulsified cosmetics of the present invention, Examples 12 and 13, showed excellent properties in all tests, and in particular, Example 13 was used for a long time (6
Good storage stability was obtained over a period of 6 months.

Examples 14 and 15 [W / O type hair cream] In the same manner as in Example 1, W / O type hair creams having the following compositions were prepared and various tests were conducted.

(1) Composition (3) Properties As shown in Table 3, Examples 14 and 15 which are emulsion cosmetics of the present invention show excellent properties in all of the tests, and in particular,
In Example 15 in which L-DFE and S-DFE were blended, good storage stability was obtained over a long period (5 months).

(Effects of the Invention) As described above, the present invention provides a useful emulsion-type cosmetic excellent in practical properties such as storage stability, skin safety and spreadability, viscosity, moisture retention, and water resistance. It is clear.

Claims (3)

[Claims] 1. A dextrin fatty acid ester and at least 100 mg equivalent / 100 g of cation-exchangeable sodium ions.
An oil phase / water phase type or water phase / oil phase type emulsified cosmetic composition containing the bentonite contained, an oily substance, and water. 2. The emulsified cosmetic composition according to claim 1, wherein the 4% by weight aqueous dispersion of bentonite has a viscosity of 150 to 800 centipoise. 3. The emulsion cosmetic according to claim 1, further comprising xanthan gum.