JPS6327412A - Emulsion cosmetic - Google Patents

Abstract

PURPOSE:A emulsion cosmetic that is composed of dextrin fatty acid ester, bentonite containing a specific amount of cation-exchangeable sodium ions, oily substances and water or xanthane gum, thus showing excellent storage stability, skin safety and practical performance. CONSTITUTION:The objective O/W or W/O type emulsion cosmetic contains 0.2-5.0wt% of dextrin fatty acid ester such as dextrin palmitate, 0.05-5.0wt% of bentonite containing 100-160mg equivalent/100g of polymer of cation- exchangeable sodium ion, e.g., high-purity sodium montmorilonite, 10-70wt% of oily substance, and 20-85wt% of water or additionally 0.1-2.0wt% of xanthane gum. The resultant cosmetic shows excellent storage stability, skin safety, spreadability, moisture retention and resistance to water.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to an oil phase/water phase type (hereinafter referred to as O/W type) which is a mixture of a dextrin fatty acid ester, a specific bentonite described below, an oily substance, and water. The present invention relates to an emulsified cosmetic that exhibits a dispersion state of a water phase/oil phase type (hereinafter abbreviated as a W2O type) or a water phase/oil phase type (hereinafter abbreviated as a W2O type).

More specifically, storage stability, skin safety and practical properties (
This invention relates to emulsified cosmetics 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 O/W type or W2O type emulsion compositions.

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 the case of emulsified cosmetics in which an emulsified composition containing a high concentration of this surfactant is applied as a cosmetic base, (a) "elongation" (spreadability) is important in terms of practical properties. ) is bad, (b) has a sticky or slimy feel (poor viscosity), (c) has poor water resistance, and makeup tends to come off due to sweating, etc. had various problems such as poor skin safety, and were not necessarily satisfactory.

(Disclosure of the Invention) Therefore, as a result of intensive research into emulsified cosmetics containing various thickeners, the present inventors found that dextrin fatty acid ester (hereinafter abbreviated as DFE), a specific bentonite described below, O/W made by blending oily substance and water
The present invention was completed by discovering that the type or W10 type emulsified cosmetic solves all of the above-mentioned problems.

(Objective of the Invention) That is, the object of the present invention is to provide O2 with excellent storage stability, skin safety, and practical properties (spreadability, viscosity, moisture retention, and water resistance).
/W type or W10 type emulsified cosmetic.

(Structure of the Invention) The present invention provides at least 100 mg equivalent of dextrin fatty acid ester and cation exchangeable sodium ion.
This is an oil phase/water phase type or water phase/oil phase type emulsified cosmetic made by blending 100g of bentonite, an oily substance, and water.

(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, dextrin palmitate stearate, and products esterified with unsaturated or side chain higher fatty acids include dextrin oleate. Examples include ester, dextrin isopalmitate, dextrin isostearate, etc., and one or more of these may be used.

In addition, in the present invention, in particular, DFE (hereinafter abbreviated as 5DFfE), which is an esterified product with the above-mentioned higher saturated fatty acid, and unsaturated or 9! When blended in combination with DFE (hereinafter abbreviated as L-DFE), which is an esterified product of IJ chain higher fatty acid, 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 0.2 wt%, the storage stability will be 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 1960, refer to) is 100 to 160 mg equivalent/
100g is enough, and 4.
The viscosity of the Qwt% aqueous dispersion is preferably 150 to 800 centipoise (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 fractionated and purified to obtain bentonite with various cation-exchangeable sodium ion contents, and as described later, O/W
As a result of blending into a type or W2O type emulsified cosmetic, bentonite (hereinafter referred to as bentonite (Na: 100-160)) has a high content of cation-exchangeable sodium ions, with a value of 100 to 160 mg/f/100 g. [Omitted]] has excellent water swelling properties, and was clearly recognized to increase the viscosity of the aqueous phase component and improve the storage stability and other properties of emulsified cosmetics when incorporated in a small amount.

In addition, bentonite showing various cation-exchangeable sodium ion contents used in the Examples section below, and its 4.
The viscosity of the Qwt% aqueous dispersion is as follows.

The amount of bentonite blended is preferably 0.05 to 5.0% based on the total amount of the cosmetic. Qwt%.

If O,Q is less than 5wt%, storage stability is not sufficient,
Moreover, if it exceeds 5.0 wt%, the appearance characteristics and practical characteristics of the dosage form will deteriorate.

The DFE and bentonite (Na: 100-160) added to the emulsified cosmetic of the present invention increase the viscosity of the oil phase component and the water phase component, respectively, and improve the interfacial viscosity of the dispersed particles due to a synergistic effect. It was surmised that this was the case, and it was found that it not only has good storage stability but also has excellent properties that were not expected in the past.

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 10% based on the total amount of the cosmetic.
~7Qwt.

In addition, the water is purified water that is usually used, such as deionized purified water treated with an ion exchange resin or distilled water, and the blending amount is 20 to 88% based on the total amount.
It is preferable to set it to 5 wt%.

Furthermore, the emulsified cosmetic of the present invention contains xanthan gum in an amount of 0.1 to 2.0% based on the total amount. It was confirmed that by adding Owt%, much better properties were obtained.

In addition to the above, the emulsified cosmetic of the present invention may contain ordinary cosmetic raw materials 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.

In addition, the emulsified cosmetics of the present invention include skin creams, skin emulsions, pine surge creams, cleansing creams,
It is applied to hair creams, makeup bases, hand creams, and many other emulsion-like or cream-like cosmetics.

(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 8 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 batch test bandage 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 (8) 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 [O/W type skin cream] As shown in the composition below, various thickeners were blended as shown in the table to make each O/W type skin cream. Composition In Comparative Example 1, the amount of (B,) component POE sorbitan monooleate (20EO) was increased to 3.5 wt%,
In addition to the ingredients listed above, 5 wt % of cetyl alcohol sulfate ester Na salt was added to component (C). In addition, in Example 5, xanthan gum to, 5w in component (C)
t% was added.

(2) Preparation method (A) Among component (7), DFE is mixed in component (B), other components are mixed in component (C), and (B) and (C) are prepared.
Each component was heated and dissolved at 80°C. Then (B),
Component (C) was mixed and cooled to 30°C while stirring to prepare each skin cream.

(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 emulsified cosmetics of the present invention, showed excellent properties in all of the tests, especially Example 5 in which xanthan gum was added and Example in which L-DFE and 5-DFE were blended. Sample No. 6 had good storage stability over a long period of time (6 months).

Examples 7 to 11, Comparative Examples 5 to 8 [W10 type hand cream] Similarly to Example 1, each W10 type hand cream was prepared with the following composition and various tests were conducted.

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

(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 content 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, clearly The storage stability was poor.

Examples 7 to 11, which are emulsified cosmetics of the present invention, exhibited excellent properties in all of the various tests, and in particular, Examples 10 and 11 exhibited good storage stability over a long period of time (5 months). was gotten.

Examples 12 to 13, Comparative Example 9 [0/W type makeup base] In the same manner as in Example 1, each OZW type makeup base was prepared with the following composition, and various tests were conducted in group (1). In Example 13, 0.5 wt% of xanthan gum was added to the component (C).

(3) Properties As shown in Table 3, Comparative Example 9, in which bentonite with a low content of cation-exchangeable sodium ions (Na 0) was blended, was clearly inferior in storage stability.

Examples 12 and 13, which are emulsified cosmetics of the present invention, exhibited excellent properties in all of the tests, and in particular, Example 13 exhibited good storage stability over a long period of time (6 months). It was done.

Example 14.15 [Ar cream for W2O type] Ar cream for each W2O type was prepared with the following composition in the same manner as in Example 1, and various tests were conducted. (1) Composition (3) Characteristics As shown in Table 3, Examples 14 and 15, which are emulsified cosmetics of the present invention, exhibited excellent properties in all of the various tests, especially those containing L-DFE and 5-DFE. Example 15 shows the effects of the invention over a long period of time (5 months). It is important to provide useful emulsified cosmetics with excellent practical properties.

Claims (3)

[Claims] (1) Dextrin fatty acid ester and cation exchangeable sodium ion at least 100 mg equivalent/10
An oil phase/water phase type or water phase/oil phase type emulsified cosmetic comprising 0g of bentonite, an oily substance, and water. (2) The emulsified cosmetic according to claim (1), wherein the bentonite has a viscosity of 150 to 800 centipoise in a 4% by weight aqueous dispersion thereof. (3) The emulsified cosmetic according to claim (1), which further contains xanthan gum.