JPH07531B2 - Emulsified cosmetics - Google Patents

Description

TECHNICAL FIELD The present invention relates to an oil phase / water phase obtained by mixing a specific water-soluble chitin derivative described below, a dextrin fatty acid ester, a surfactant, an oily substance, and water. The present invention relates to an emulsified cosmetic having a type (hereinafter abbreviated as O / W type) or an aqueous phase / oil phase (hereinafter abbreviated as W / O type) dispersed 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 bad, (b) has a "sticky feeling", "slickness" (poor consistency), (c) is poor in water resistance, and makeup may be easily lost due to sweating. Had various problems such as poor skin safety and was not always satisfactory.

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies on emulsion cosmetics containing various thickeners, and as a result, dextrin fatty acid ester (hereinafter abbreviated as DFE), glycol chitin, and carboxymethyl chitin. O / W obtained by blending a salt and its salt, a water-soluble chitin derivative such as sodium chitin sulfate, an oily substance, water, and a surfactant at a low concentration.
The present invention has completed the present invention by finding that the type or W / O type emulsion cosmetics solve the above problems.

(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 relates to at least one chitin derivative selected from the group consisting of glycol chitin, carboxymethyl chitin and salts thereof, and sodium chitin sulfate, a dextrin fatty acid ester, a surfactant, and an oily substance. Is an oil phase / water phase type or water phase / oil phase type emulsion type cosmetic composition.

(Detailed Description of Structure) The water-soluble chitin derivative used in the present invention is a known substance, and in JP-A-59-106409, there are described glycol chitin, carboxymethyl chitin, and sodium chitin sulfate. Manufacturing methods and characteristics are described.

Glycol chitin is obtained by reacting chitin powder with caustic soda to form alkali chitin and adding ethylene oxide to the alkali chitin, and carboxymethyl chitin is obtained by reacting the alkali chitin with monochloro. In addition, sodium chitin sulfate is obtained by sulfonating chitin powder with chlorsulfonic acid and then neutralizing it with caustic soda.

The structural formulas of these chitin derivatives are as follows.

The salt of carboxylmethyl chitin is a salt of the above-mentioned carboxyl methyl chitin and a well-known basic substance,
For example, sodium salt of carboxymethyl chitin, potassium salt, triethanolamine salt, L-lysine salt, L
-Arginine salts etc. are applied.

In the present invention, the chitin derivative preferably has a molecular weight of 1000 daltons or more, and glycol chitin,
By blending at least one member selected from the group consisting of carboxymethyl chitin, a salt thereof, and sodium chitin sulfate, the emulsion cosmetic of the present invention having excellent various properties can be obtained as described below.

The content of the chitin derivative is preferably 0.2 to 5.0 wt% based on the total amount of the cosmetic. The amount is 0.2w
If it is less than t%, the storage stability is poor, and if it exceeds 5.0% by weight, practical properties such as appearance and viscosity of the dosage form are deteriorated.

The DFE used in the present invention is a known substance and is disclosed in JP-A-52-25
Japanese Patent No. 039 describes a DFE manufacturing method 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 surfactant used in the present invention may be a commonly used surfactant for cosmetics.

The blending amount is 0.1 to 0.2 wt% for anionic surfactants such as sodium cetanol sulfate, and 0.5 to 2.0 wt% for nonionic surfactants such as POE higher alcohol ether type and POE polyhydric alcohol fatty acid ester type. Further, the nonionic surfactant such as polyhydric alcohol fatty acid ester type such as sorbitan sesquioleate is preferably 1.0 to 3.0 wt%, and the emulsion cosmetic of the present invention excellent in various properties as described below can be obtained. .

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.
70 wt%.

Further, the water is usually used purified water, deionized purified water treated with ion exchange resin or distilled water, etc. is applied, and the blending amount thereof may be 20 to 80 wt% based on the total amount. preferable.

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 includes skin cream, skin emulsion, massage cream, cleansing cream, hair cream, makeup base, hand cream, and the like.
It is applied to many other emulsion or cream cosmetics.

(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 4 and Comparative Examples 1 to 4 [O / W type skin cream] Each O / W type skin cream was prepared by blending various chitin derivatives and DFE as shown in Table 1 as shown below. A cream was prepared and the above tests were carried out.

(1) Composition In Comparative Examples 1 and 2, the POE sorbitan monostearate (20EO) as the component (B) was increased to 3.0 wt%, and in the component (C), in addition to the above table, cetyl alcohol sulfate ester was added.
0.5 wt% of Na salt was added and compounded.

(2) Preparation method Among components (A), DFE is mixed with component (B), chitin derivative is mixed with component (C), and each of components (B) and (C) is heated to 80 ° C. Dissolved. Next, the components (B) and (C) were mixed and cooled to 30 ° C. with stirring to prepare each skin cream.

(3) Properties As shown in Table 1, Comparative Examples 1 and 2 containing a surfactant in a high concentration have good storage stability, but favorable results are obtained in terms of skin safety and practical properties. No, also DF
Comparative Example 3 in which E or a chitin derivative was individually blended
No. 4 was obviously inferior in storage stability. Also,
Examples 1 to 4, which are emulsion type cosmetics of the present invention, show excellent properties in all of the tests, and in particular, Example 4 containing L-DFE and S-DFE was used for a long period (5 months). ), Good storage stability was obtained.

Examples 5 to 8 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 Examples 5 to 6, 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.

(2) Properties As shown in Table 2, Comparative Examples 5 to 6 in which a surfactant is blended at a high concentration have good storage stability, but favorable results are obtained in terms of skin safety and practical properties. No, also DF
Comparative Example 7 in which E or a chitin derivative was individually blended
8 was obviously inferior in storage stability.

Examples 5 to 8 which are emulsion type cosmetics of the present invention show excellent characteristics in all of the tests, and in particular, Example 8 containing L-DFE and S-DFE was used for a long period (5 months). ), Good storage stability was obtained.

Examples 9 to 10 and Comparative Examples 9 to 10 [O / W-type makeup base] Similar to Example 1, each O / W-type makeup base was prepared with the following composition, and various tests were conducted. did.

(1) Composition (3) Characteristics As shown in Table 3, Comparative Examples 9 to 10 in which each of DFE or the chitin derivative was incorporated alone was obviously inferior in storage stability.

Examples 9 to 10, which are emulsion cosmetics of the present invention, show excellent properties in all of the tests, and in particular, Example 10 containing L-DFE and S-DFE was used for a long period (5 months). ), Good storage stability was obtained.

Examples 11 to 12 and Comparative Examples 11 to 12 [W / O type hair cream] In the same manner as in Example 2, each W / O type hair cream having the following composition was prepared and various tests were conducted.

(1) Composition (2) Properties As shown in Table 3, Comparative Examples 11 to 12 in which DFE or a chitin derivative was blended alone were obviously inferior in storage stability.

Examples 11 to 12, which are emulsion cosmetics of the present invention, show excellent properties in all of the tests, and in particular, Example 12 containing L-DFE and S-DFE was used for a long period (5 months). ), Good storage stability was obtained.

(Effects of the Invention) As described above, the present invention provides a useful O / W type or W / type which is excellent in storage stability, skin safety, and practical properties (spreadability, consistency, moisture retention, water resistance). It is obvious to provide an O-type emulsion cosmetic.

Claims (1)

[Claims] 1. At least one chitin derivative selected from the group consisting of glycol chitin, carboxymethyl chitin and salts thereof, and sodium chitin sulfate, a dextrin fatty acid ester, a surfactant, an oily substance, and water. An oil phase / water phase type or water phase / oil phase type emulsion type cosmetic composition which is not mixed.