JPS6330405A - Multi-phase emulsion cosmetic - Google Patents

Abstract

PURPOSE:To obtain an O/W/O-type multi-phase emulsion cosmetic having improved storage stability, safety to skin and practical characteristics, by compounding a specific bentonite to an aqueous phase component of an intermediate layer and a dextrin fatty acid ester to the outermost oil phase component. CONSTITUTION:An O/W-type emulsion is produced by dispersing and emulsifying (A) an oily solution composed of an oily substance and a lipophilic surfactant in (B) an aqueous phase component composed of an aqueous dispersion of a bentonite having a cation-exchanging sodium ion content of >=100mg-equivalent/100g and preferably having a viscosity of 150-800cps as 4wt% aqueous dispersion. The obtained emulsion is dispersed and emulsified in (C) an oily phase component composed of a dextrin fatty acid ester, an oily substance and a lipophilic surfactant to obtain the objective multi-phase emulsion cosmetic having excellent storage stability, safety to skin and practical characteristics (spreadability, viscosity, moisture-retainability and water-resistance) and exhibiting an O/W/O-type dispersion state. Further improved various characteristics can be attained by adding xanthan gum to the above aqueous phase component.

Description

[Detailed description of the invention] (Technical field) Oil phase/water phase/oil phase type (hereinafter abbreviated as O/W/Q type)
The present invention relates to a multi-phase emulsion type cosmetic exhibiting a dispersed state.

More specifically, storage stability, skin safety and practical properties (
The present invention relates to a multi-phase emulsion type cosmetic with excellent spreadability, viscosity, moisturizing properties, water resistance, etc.

(Prior Art) Conventionally, various thickeners (gelling agents) have been used to improve the storage stability of emulsified compositions in various dosage forms.

For example, water-soluble thickeners include bentonite, vegum, xanthan gum, pectin, carrageenan, hydroxypropyl cellulose, etc., and oil-soluble thickeners include organic bentonite, sucrose fatty acid ester,
Dextrin fatty acid esters and the like are known.

However, emulsified compositions containing these thickeners alone do not have sufficient storage stability;
It was essential to use a high concentration of nonionic and cationic surfactants.

In addition, in emulsion-type cosmetics in which an emulsion composition containing a high concentration of this surfactant is applied as a cosmetic base,
In terms of practical properties, (a) "elongation" (spreadability) is poor; (
(b) It has a "sticky feeling" or "slimy feeling" (poor viscosity); (c) it has poor water resistance and makeup easily comes off due to sweating, etc.; It had various problems, such as poor performance, and was not necessarily satisfactory.

(Disclosure of the Invention) Therefore, as a result of intensive research into emulsified cosmetics of various formulations containing various thickeners, the present inventors have found that the specific bentonite described below is incorporated into the aqueous phase component of the intermediate layer. O
The inventors have discovered that the /W10 type multi-phase emulsion type cosmetic solves all of the above-mentioned problems, and have completed the present invention.

(Objective of the Invention) That is, the object of the present invention is to obtain a 0.000-glycerated resin which has excellent storage stability, skin safety, and practical properties (spreadability, viscosity, moisture retention, and water resistance).
/W10 type multi-phase emulsion cosmetic.

(Structure of the Invention) The present invention provides an oily solution consisting of an oily substance and a lipophilic surfactant in an aqueous phase component consisting of an aqueous dispersion of bentonite containing at least 100mg equivalent/100g of cation exchangeable sodium ions. to obtain an oil-in-water emulsion, and further disperse and emulsify this emulsion in an oil phase component consisting of a dextrin fatty acid ester, an oily substance, and a lipophilic surfactant to obtain an oil phase. It is a multi-phase emulsion type cosmetic that exhibits a dispersion state of /aqueous phase/oil phase.

(Specific explanation of the structure) DFE used in the present invention is a known substance, and is
Publication No. 2-25039 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 is preferably 1.0 or more per glucose unit.

For example, products esterified with higher saturated fatty acids include dextrin palmitate, dextrin stearate, and dextrin palmitate stearate, and products esterified with unsaturated or side chain higher fatty acids include dextrin olein. Examples include acid esters, dextrin isopalmitate esters, dextrin isostearate esters, etc., and one or more of these may be used.

In addition, in the present invention, in particular, DFE (hereinafter abbreviated as 5-DFE), which is an esterified product with the above-mentioned higher saturated fatty acids, and an esterified product with unsaturated or side chain higher fatty acids. When blended in combination with DFE (hereinafter abbreviated as L-DFE), it was found that excellent properties were exhibited in various tests described below.

The blending amount of DFE is 0.0% based on the total amount of the cosmetic.
2 to 5.0% by weight (hereinafter abbreviated as wt%) is preferable; if it is less than 0.2wt%, storage stability is poor;
．． If it exceeds 0 wt%, the appearance characteristics and practical properties such as viscosity of the dosage form will deteriorate.

The bentonite used in the present invention is sodium montmorionite, which is a type of natural colloidal hydrous aluminum silicate, and has a cation-exchangeable sodium ion content (Jikken Agricultural Chemistry, Vol. 1, pp. 59-62, Asakura bookstore,
Published in 1989, 7 references) is 10100 = 160 equivalents/
100g is enough, and 4.
The viscosity of the 0 wt% aqueous dispersion is preferably 150 to 800 centiboise (B-type rotational viscometer, measured at 20'C).

This high-purity sodium montmorionite is obtained from specific mineral deposits or through special physical and chemical treatments.

For example, bentonite produced in the Omachi region of the Yamagata region is purified by seven fractions to obtain bentonite with various cation-exchangeable sodium ion contents, and as described later, O/W
As a result of blending into type 10 multi-phase emulsion type cosmetics, the content of cation exchangeable sodium ions is high, and the value is 100~
160 mg equivalent/100 g of bentonite [hereinafter abbreviated as bentonite (Na: 100-160)] has excellent water swelling properties, and with a small amount blended, it can increase the viscosity of the water phase component in the outermost layer and create a multiphase structure. It was recognized that various properties such as storage stability of emulsified cosmetics were improved.

In addition, bentonites showing various cation-exchangeable sodium ion contents used in the Examples section below, and bentonites 4
．． The viscosity of the 9wt% aqueous dispersion is as follows: The amount of bentonite blended above is preferably based on the total amount of the cosmetic.
It is 0.05 to 5.0 wt%. If it is less than 0.05 wt%, the storage stability will not be sufficient, and 5. If it exceeds Qwt%, the appearance and practical properties of the dosage form will deteriorate.

It is presumed that the DFE and bentonite (Na: 100-160) blended into the emulsified cosmetic of the present invention improve the interfacial viscosity of the dispersed particles due to their synergistic effect, and improve not only the storage stability but also the conventional It was found that this material has various excellent properties that were not expected.

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

One or more of these oily substances are selected and applied depending on the type of cosmetic, dosage form, purpose, etc.

The blending amount is usually 30% based on the total amount of the cosmetic.
~8Q wt%.

In addition, lipophilic surfactants include known esterification products of polyhydric alcohols and higher fatty acids, ethylene oxide adducts of higher alcohols or oils, and examples thereof include sorbitan monostearate, sorbitan monooleate, and sorbitan sesquidase. Oleate, sucrose oleate, glyceryl monostearate, diglyceryl monostearate, ethylene glycol (5EO) monooleate,
Examples include POE stearyl ether (5EO) and POE hydrogenated castor oil (10EO).

The blending amount is usually 2.0% based on the total amount of the cosmetic.
It is 0 to 7.0 wt%.

The amount of the oily solution consisting of an oily substance and a lipophilic surfactant, which forms the innermost layer, is preferably 10 to 35 wt% based on the total amount, and the amount of the oil phase component, which forms the outermost layer, is based on the total amount. It is preferable to set it as 30-70wt%.

The water used in the present invention is commonly used purified water, such as deionized purified water treated with an ion exchange resin or distilled water.

Furthermore, in the multi-phase emulsion type cosmetic of the present invention, xanthan gum is contained in the aqueous phase component serving as the middle layer in an amount of 0.1 to 0.1% based on the total amount.
It was confirmed that by blending 1.5 wt%, much more excellent properties were obtained.

In addition to the above, the emulsified cosmetic of the present invention may contain conventional cosmetic ingredients such as surfactants, fragrances, preservatives, humectants, pigments, pigments, etc. to achieve the purpose of the present invention. It can be blended as appropriate within the range.

Next, a method for producing the multiphase emulsion type cosmetic of the present invention will be explained.

The oil phase solution consisting of
The oil solution is dispersed and emulsified in this aqueous phase component, and O
/W type emulsion is obtained. Next, this emulsion was dispersed and emulsified in an oil phase component consisting of DFE, an oily substance, and a lipophilic surfactant, which had been heated and dissolved in advance and adjusted to 80°C, and then cooled to 30°C while stirring. By doing so, it is possible to produce a multi-phase emulsion type cosmetic exhibiting the desired O/W10 type dispersion state.

The emulsified cosmetic of the present invention can be applied to many other emulsion-like or cream-like cosmetics such as skin cream, skin emulsion, pine surge cream, cleansing cream, hair cream, makeup base, hand cream, and the like.

(Example) The present invention will be explained below 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 storing the sample in a constant temperature room at 45°C for 3 months, observe the appearance and emulsification state of the sample, and if no abnormality is observed (
The emulsified state and particles were uniform) were evaluated as good, and the cases where abnormalities were observed (oil separated, particles became coarse, etc.) were evaluated as poor.

(2) Skin safety test 0°05g of the sample was applied to the skin of the pressure side of the forearm of 25 subjects using a patch test plaster with a circular lint cloth with a diameter of 1.0cm for 24 hours. The skin condition of 25 subjects was evaluated for each sample according to the following criteria.

The evaluation results were determined based on the stronger reaction between 1 hour and 24 hours after removal of the bandage, and expressed as the number of people who rated (±) or higher.

Judgment Criteria (3) Practical Property Test (Spreadability, Viscosity, Moisture Resistance, Water Resistance) After 20 test subjects used the sample for 10 days, the properties of the sample were evaluated.

The test results for test items such as spreadability, viscosity, moisture retention, and water resistance were ``good spreadability when applied,'' ``no sticky or slimy feeling,'' and ``leaving the skin moist.'''', and the number of people who answered ``My makeup doesn't come off easily or my hair gets messy due to sweat.''

Examples 1 to 6, Comparative Examples 1 to 4 [0/W10 type skin cream] Each O/W10 type skin cream was prepared by blending various DFE and bentonite as shown in the table below. The skin cream was subjected to the various tests described above.

(1) Composition (a) O/W type emulsion Stearate (20EO) was increased to 3.0wt%,
In addition to the above-mentioned raw materials, 2.0 wt % of Ca stearate was added to component (C).

In addition, in Example 5, 0.5 t% of xanthan gum was added to component (C) in addition to the above-mentioned raw materials.

(2) Preparation Method (A) and (B) are each dissolved in IW with 80'CL, and (7) component (B) is mixed with (A) component while stirring to disperse and emulsify. An O/W emulsion was obtained. Then,
This emulsion was heated and mixed at 80°C in advance (
C) After mixing with stirring into the ingredients, add 30 minutes while stirring.
Each skin cream was prepared by cooling to °C.

(3) Characteristics As shown in the table, Comparative Example 1, in which a high concentration of surfactant was blended, had good storage stability, but no favorable results were obtained in terms of skin safety and practical properties. In addition, Comparative Example 2, in which bentonite with a low content of cation-exchangeable sodium ions (Na 0) was blended, and Comparative Examples 3 and 4, in which bentonite (Na: 120) or DEF were blended alone, were clearly preserved. The stability was poor.

Examples 1 to 6, which are multi-phase emulsion type cosmetics of the present invention, exhibited excellent properties in all tests, and in particular, Example 5 in which xanthan gum was added and in which L-DFE and 5-DFE were blended. In Example 6, good storage stability was obtained over a long period of time (5 months).

Examples 7 to 11, Comparative Examples 5 to 8 [0/W10 type makeup base] Similarly to Example 1, each 0/W10 type makeup base was made with the following composition.
A mold make-up base was prepared, and various tests were conducted. Sorbitan monostearate (20EO) 3
．． Owt% wt%, 3.0 wt% of POE stearyl ether (5EO) was added to component (C),
Further, in Example 10, 0.3 wt% xanthan gum was added to the component (C).

(2) Preparation method Components (A) and (B) are each heated and dissolved at 80°C, and component (B) is mixed in this component (A) with stirring, and dispersed and emulsified to form an O/W emulsion. Next, this emulsion was mixed with stirring into component (C), which had been heated and mixed at 80° C., and then cooled to 30° C. with stirring to prepare each makeup base.

(3) Properties As shown in Table 2, Comparative Example 5, in which a high concentration of surfactant was blended, had good storage stability, but did not yield favorable results in terms of skin safety and practical properties. In addition, Comparative Example 6, in which bentonite with a low amount of cation-exchangeable sodium ions (Na 0) was blended, and Comparative Examples 7 to 8, in which bentonite (Na: 120) or DEF were blended alone, were clearly preserved. The stability was poor.

Examples 7 to 11, which are multi-phase emulsion type cosmetics of the present invention, exhibited excellent properties in all of the various tests, especially Example 10 in which xanthan gum was added and in which L-DFE and 5-DFE were blended. In Example 11, good storage stability was obtained over a long period of time (5 months).

Examples 12 to 15, Comparative Examples 9 and 10 [Ar cream for 0/W10 type] Similarly to Example 1, each 0/W10 with the following composition
Prepare an air cream for molds and conduct various tests. ate (20EO) was increased to 3.5 wt%, (C)
POE stearyl ether (5EO) in the ingredients is 3.0
The amount was increased to wt%. In addition, in Example 14, in addition to the yK material component, 0.2w of xanthan gum was added to the component (C).
On addition of t% addition.

(2) Preparation Method (A) and (B) components are each heated and dissolved at 80'C, and (B) component is mixed in this (A) component with stirring, dispersed and emulsified to form an O/W type. An emulsion was obtained.Next, this emulsion was mixed with stirring into component (C) which had been heated and mixed at 80°C in advance, and then cooled to 30°C with stirring to prepare each hair cream.

(3) Properties As shown in Table 3, Comparative Example 9, in which a high concentration of surfactant was blended, had good storage stability, but no favorable results were obtained in terms of skin safety and practical properties. In addition, Comparative Example 10, in which bentonite with a low content of cation-exchangeable sodium ions (Na 0) was blended, was clearly inferior in storage stability.

Examples 12 to 15, which are multiphase emulsion type cosmetics of the present invention, are as follows:
In particular, Example 14 in which xanthan gum was added and Example 15 in which L-DFE and 5-DFE were blended exhibited good storage stability over a long period of time (5 months). I got sex.

(Effect of the invention)

Claims (3)

[Claims] (1) An oily solution consisting of an oily substance and a lipophilic surfactant is dispersed and emulsified in an aqueous phase component consisting of an aqueous dispersion of bentonite containing at least 100mg equivalent/100g of cation exchangeable sodium ions. Obtain an oil emulsion, and further disperse and emulsify this emulsion in an oil phase component consisting of a dextrin fatty acid ester, an oily substance, and a lipophilic surfactant to obtain an oil phase/aqueous phase/oil phase. A multi-phase emulsion type cosmetic that exhibits a dispersed state. (2) The multi-phase emulsion type cosmetic according to claim (1), wherein the bentonite has a viscosity of 150 to 800 centipoise in its 4% by weight aqueous dispersion. (3) The multi-phase emulsion type cosmetic according to claim (1), further comprising xanthan gum added to the aqueous phase component.