JPS6396111A - Emulsion type cosmetic - Google Patents

Abstract

PURPOSE:To obtain an O/W type or a W/O type emulsion type cosmetic having improved shelf stability, skin safety, spreading and extending properties, by blending a chitin derivative with a dextrin fatty acid ester with a surface active agent, an oily substance and water. CONSTITUTION:A emulsion type cosmetic obtained by blending at least one chitin derivative (preferably one having >=1,000 dalton molecular wight) selected from a group consisting of glycol chitin, carboxymethyl chitin, a salt thereof and sodium chitin sulfate with a dextrin fatty acid ster, a surface active agent (anionic type or nonionic type), an oily substance and water. The blending ratio of each component based on sum of the cosmetic is preferably 0.2-5.0wt% chitin derivative and 0.3-5.0wt% dextrin fatty acid ester, 10-70wt% oily substance (wax, etc.) and usually 20-80wt% water. The blending ratio of the surface active agent is 1.0-3.0wt% in the case of sorbitan sesquioleate.

Description

Detailed Description of the Invention (Technical Field) The present invention provides an oil phase/aqueous phase comprising a specific water-soluble chitin derivative described below, a dextrin fatty acid ester, a surfactant, an oily substance, and water. It is an emulsified cosmetic that exhibits a dispersion state of type (hereinafter abbreviated as 0/W type) or aqueous phase/oil phase type (hereinafter abbreviated as W2O type).

More specifically, storage stability, skin safety and practical properties (
The present 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), glycol chitin, carboxymethyl chitin, etc. and a salt thereof, a water-soluble chitin derivative such as sodium chitin sulfate, an oily substance, water, and a surfactant at a low concentration.
It was discovered that a W type or W10 type emulsion type cosmetic solves all of the above problems, and the present invention was completed.

(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 W2O type emulsified cosmetic.

(Structure of the Invention) The present invention provides an oil phase/water phase type or water phase/oil phase type emulsion formed by blending glycol chitin, carboxymethidextrin fatty acid ester, a surfactant, an oily substance, and water. It is a type cosmetic.

(Specific explanation of the structure) The water-soluble chitin derivatives used in the present invention are known substances, and JP-A No. 59-106409 describes glycol chitin, carboxymethyl chitin, and sodium chitin sulfate. The manufacturing method and properties of the product are described.

Glycol chitin is produced by reacting chitin powder with caustic soda to produce alkaline chitin, and adding ethylene oxide to this alkaline chitin. Sodium chitin sulfate can also be 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.

Carboxymethyl sodium chitin Salts of carboxymethyl chitin are salts of the above-mentioned carboxymethyl chitin and well-known basic substances, such as sodium cum salts, potassium salts, triethanolamine salts of carboxymethyl chitin, L-lysine salt, L-arginine salt, etc. are applicable.

In the present invention, by blending at least one member of the group consisting of lamb chitin sulfate with a molecular weight of the above-mentioned chitin derivative, it is possible to obtain the emulsion type cosmetic of the present invention having excellent various properties as described below.

The amount of the chitin derivative blended is preferably in the range of 0.2 to 5.0 wt% based on the total amount of the cosmetic. If the blending amount is less than 0.2 wt%, 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.

DFE used in the present invention is a known substance, and is
2-25039 describes a method for producing DFH and its properties.

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 valmitate 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 DFE, which is an esterified product with unsaturated or side chain higher fatty acids. (hereinafter abbreviated as L-DFB) was found to exhibit excellent properties in various tests described below.

The blending amount of DFB is 0.00% 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 Qwt%, the appearance characteristics and practical properties such as viscosity of the dosage form will deteriorate.

The surfactant used in the present invention may be any commonly used surfactant for cosmetics.

The blending amount is 0.1 to 0.2 wt% for anionic surfactants such as cetanol sulfate Na salt, and 0.1 to 0.2 wt% for nonionic surfactants such as POE higher alcohol ether type and POE polyhydric alcohol fatty acid ester type. 5-2.
0 wt%, and preferably 1.0 to 3.0 wt% for nonionic surfactants such as polyhydric alcohol fatty acid esters such as sorbitan sesquiolate, and the emulsion type 101 of the present invention has excellent properties as described below. can be obtained.

The oily substance used in the present invention is a known oily raw material for cosmetics, and includes, for example, oils, 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.
~70wt%.

In addition, the water is commonly used purified water, such as deionized purified water treated with an ion exchange resin or distilled water, and the blending amount is 20 to 80 w based on the total amount.
It is preferable to set it as t%.

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.

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 Test on the skin of the bottom side of the forearm of 25 subjects.

After occluding 0.5g of the sample for 24 hours using a patch test adhesive with a circular lint cloth attached with a diameter of 1.0cm, the condition of the skin of 25 subjects was evaluated for each sample according to the criteria below. .

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 retention, water resistance) After 20 test subjects operated the trial YG 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 4, Comparative Examples 1 to 4 [0/W type skin cream] Various chitin derivatives and DFE were blended as shown in the table below to make each 0/W type skin cream. A cream was prepared and the above tests were conducted.

(1) Composition In Comparative Examples 1 and 2, 3.0% of POE sorbitan monostearate (20EO) as component (B) was used. The amount was increased to Qwt%, and 5wt% of cetyl alcohol sulfate ester Na salt was added to the component (C) in addition to the above table.

(2) i! ! Manufacturing method Among the components (A), DPE was mixed into the component (B), the chitin derivative was mixed into the component (C), and the components (B) and (C) were each dissolved by heating at 80°C. . Then (B), (
C') Components were mixed and cooled to 30'C while stirring to prepare each skin cream.

(3) Characteristics As shown in the table, Comparative Examples 1 and 2, in which surfactants were blended at high concentrations, had good storage stability, but did not yield favorable results in terms of skin safety and practical properties. D
Comparative Example 3 in which FE or chitin derivative was blended alone
-4 were clearly inferior in storage stability. In addition, Examples 1 to 4, which are emulsified cosmetics of the present invention, exhibited excellent properties in all of the various tests, and in particular, L-DFE and 5-D
Example 4 containing FE had good storage stability over a long period of time (5 months).

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

(1) Composition In Comparative Examples 5 and 6, the amount of sorbitan sesquioleate as component (B) was increased to 5.0 wt%, and (in component (1'), in addition to the above table, stearic acid 3.5w of calcium
t% was added.

(2) Properties As shown in Table 3, Comparative Examples 5 and 6, in which surfactants were blended at high concentrations, had good storage stability, but did not yield favorable results in terms of skin safety and practical properties. D
Comparative Example 7 in which FE or chitin derivative was blended alone
-8 were clearly inferior in storage stability.

Examples 5 to 8, which are emulsified cosmetics of the present invention, exhibited excellent properties in all tests, and in particular, L-DFE and 5-DF
Example 8 in which E was blended had good storage stability for a long period of time (5 months).

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

(1) Composition (2) Properties As shown in Table 3, Comparative Examples 9 and 10, in which DFE or chitin derivatives were blended alone, were clearly inferior in storage stability.

Examples 9 to 10, which are emulsified cosmetics of the present invention, exhibited excellent properties in all of the various tests, and in particular, L-DFB and 5-D
Example 10 containing FE had good storage stability over a long period of time (5 months).

Examples 11-12, Comparative Examples 11-12 [Ar cream for W2O type] In the same manner as in Example 2, Ar Cream was prepared for each W2O type with the following composition and various tests were conducted. (2) Properties As shown in Table 3, Comparative Examples 11 and 12 in which DFE or chitin derivatives were blended alone were clearly inferior in storage stability.

Examples 11 and 12, which are emulsified cosmetics of the present invention, exhibited excellent properties in all tests, and in particular, L-DFE and 5-
Example 12 containing DFE had good storage stability over a long period of time (5 months).

(Effect of the invention)

Claims (1)

[Claims] An oil containing at least one chitin derivative selected from the group consisting of glycol chitin, carboxymethyl chitin and its salts, and sodium chitin sulfate, a dextrin fatty acid ester, a surfactant, an oily substance, and water. Emulsified cosmetics of phase/water phase type or water phase/oil phase type.