JPH07291821A - Cosmetic - Google Patents

Abstract

PURPOSE:To prepare a cosmetic having stable viscosity, high stability and excellent astringent action by adding zinc ion and a carboxylic acid or its salt having a specific chelate constant to a cosmetic containing a compound generating zinc ion and a viscosity modifier having ionizable group. CONSTITUTION:This cosmetic free from troubles of viscosity lowering, separation, creaming, etc., having high stability and exhibiting excellent astringent action is produced by simultaneously compounding (a) a compound generating zinc ion in aqueous solution (especially preferably a zinc salt) and (b) a viscosity modifier having ionizable group and adding (c) a carboxylic acid or its salt having a chelate constant with zinc ion of 1/10<2> to l/10<6> and (d) water to the composition. The compound (b) is preferably sodium polyacrylate, sodium carboxymethylcell-ulose or xanthan gum. The cosmetic is especially preferably an emulsion-type cosmetic. The cosmetic may further be compounded with a surfactant and an oily base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention does not reduce the astringent effect and the viscosity even if a compound such as an astringent which produces zinc ions and a viscosity modifier having an ionizing group are simultaneously added, and thus separation, creaming and the like are prevented. It relates to stable cosmetics that do not occur.

[0002]

2. Description of the Related Art Generally, cosmetics, especially emulsion type cosmetics such as emulsions and creams, are applied after thoroughly removing dirt adhering to the skin by a facial cleanser or the like, and applying an appropriate amount of moisture to the stratum corneum of the skin. It is used for the purpose of supplying moisturizing ingredients to regulate the physiological activity of the skin.

The emulsified cosmetics currently on the market have not only a moisturizing effect but also a refreshing feeling according to the skin quality of the user, the condition of the skin, the season or the application, etc., accompanying the diversification of life.
Various effects such as protection against ultraviolet rays, astringency, and detergency are imparted.

Among these, the cosmetics having astringent action are
By suppressing the excess oil secretion of the skin by the astringent that is blended, or by adjusting the water content,
The purpose is to tighten the skin.

In order to obtain an astringent effect, a salt compound of a divalent metal typified by zinc has been added to such cosmetics as an astringent.

[0006]

[Problems to be Solved by the Invention] However, an aqueous solution
-COO with such compounds that produce zinc ions in
^-A viscosity modifier with an ionizing group such as
When the ionizing group and zinc ion are bonded,
Stability is impaired, especially in the case of emulsified systems.
Cracking, separation and creaming occur, and the astringent effect is fulfilled.
There was a problem that I could not get enough.

Therefore, the object of the present invention is to provide a stable and excellent astringent action without causing viscosity decrease, separation, creaming, etc. even if a compound that produces zinc ions and a viscosity modifier having an ionizing group are simultaneously added. To provide a cosmetic having

[0008]

In view of such circumstances, the inventors of the present invention have conducted diligent research, and as a result, as a result, zinc ions were added to cosmetics containing a compound that produces zinc ions and a viscosity modifier having an ionizing group. If a carboxylic acid or salt thereof having a specific chelate constant is added to chelate zinc ions,
Viscosity by the viscosity modifier is maintained, stability is good,
Further, they have found that a cosmetic having an excellent astringent effect can be obtained and completed the present invention.

That is, the present invention provides the following component (a),
(B), (c) and (d) (a) Compound that produces zinc ion in aqueous solution (b) Viscosity modifier having an ionizing group (c) Chelate constant with zinc ion is 10 ^-2 to 10 ^-6 The present invention provides a cosmetic containing carboxylic acid or a salt thereof (d) water.

In the present invention, the chelate constant means a chelate formation constant derived from the formula (2) when the chelate (A _p B _q ) is formed by the reaction shown in the following (1).

[0011]

[Equation 1]

[In the formula, A represents a zinc ion, B represents a carboxylic acid as a ligand, and K represents a chelate constant.]

The compound which produces zinc ions in the aqueous solution of the component (a) in the present invention is not particularly limited as long as it has been conventionally blended in cosmetics and the like as an astringent, and zinc sulfate, zinc chloride. , Zinc stearate, zinc laurate, zinc p-phenolsulfonate, and the like, zinc salts of inorganic or organic acids, zinc oxide, and the like. Of these, zinc p-phenolsulfonate, zinc sulfate and zinc oxide are particularly preferable.

As the component (a), one selected from these compounds can be used alone or in combination of two or more, and the compounding amount thereof is 0.001 to 5 in the total amount of the cosmetic. It is preferable to set the content by weight, particularly 0.01 to 1.0% by weight.

The component (b) of the present invention, which has an ionizing group, is not particularly limited as long as it is used as a component for adjusting the viscosity of cosmetics and has an ionizing group in its structure. Here, as the ionizing group, for example, −
Examples thereof include COO ⁻ group and —SO ₃ ^— group. Examples of such viscosity modifiers include the following water-soluble polymers. Specific examples thereof include sodium polyacrylate, carboxyvinyl polymer, sodium carboxymethyl cellulose, xanthan gum, carrageenan, pectin, alginic acid, sodium alginate, etc. Among them, sodium polyacrylate is preferable. The component (b) may be used singly or in a mixture of two or more, and the compounding amount thereof is 0.01 to 5.0% by weight, and particularly preferably 0.
01-1.0 wt% is preferred.

Further, the carboxylic acid or salt thereof of the component (c) of the present invention has a chelate constant with zinc ion of 10 ^-2 to 1.
There is no particular limitation as long as it is 0 ⁻⁶ .
Here, the chelate constant is as described above, and can be measured by the method for measuring the stability constant of the complex (Yasuda, Inorganic solution chemistry, Yamazaki, Matsuura, Tanaka, Tambun, p191-p194, Nankodo, 1968). Specifically, an aqueous solution containing the zinc ion-forming compound of the present invention and a carboxylic acid or a salt thereof is prepared to have the same pH as that of the cosmetic of the present invention, and the measurement is performed at 20 ° C. When the chelate constant exceeds 10 ^-2 , the above-mentioned components (a) and (b) react with each other and the viscosity is remarkably lowered, resulting in separation, creaming, etc., and the effect of the present invention cannot be achieved. On the other hand, if the chelate constant is less than 10 ⁻⁶ , the astringent effect due to zinc ions will be impaired. Particularly, the range of 10 ⁻³ to 10 ⁻⁶ is preferable.

Specific examples of the carboxylic acid as the component (c) include hydroxycarboxylic acids such as citric acid, tartaric acid, lactic acid and malic acid; dicarboxylic acids such as oxalic acid, malonic acid and succinic acid; amino acids such as histidine. Named
Examples of the salt include sodium salt, potassium salt, ammonium salt and the like. Among them, citric acid and malonic acid are preferable as the carboxylic acid, and sodium salt and potassium salt are preferable as the salt thereof.

The carboxylic acid or salt thereof as the component (c) may be used alone or in combination of two or more, and the compounding amount thereof may be 0.01 to 5% by weight based on the total amount of the cosmetic. preferable. Further, the carboxylic acid or the salt thereof as the component (c) is (c) / molar ratio with respect to the component (a).
It is preferable to add (a) = 1/1 to 20/1, particularly 1/1 to 10/1.

The amount of component (d), water, is not particularly limited and may be appropriately determined depending on the intended purpose.
A range of 9% by weight is preferred. The cosmetic of the present invention is preferably an emulsion type, and the content of water in the case of an emulsion type cosmetic is 20 to 90% by weight, and particularly 20 to 70% for a water-in-oil type.
%, And the oil-in-water type is preferably 50 to 90% by weight. When the cosmetic of the present invention is used as an emulsified cosmetic, usually a surfactant is added as the component (e) and an oily base is added as the component (f).

The component (e) surfactant used here is
It is not particularly limited as long as it is used as a blending component of cosmetics, and specifically, polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, polyoxyethylene. Nonionic surfactants such as glutamic acid, polyoxyethylene isostearic acid diester, α-monoisostearyl glyceryl ether, polyethylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and fatty acid monoglyceride; and sodium alkyl sulfate, polyoxyethylene Examples include anionic surfactants such as sodium alkyl ether phosphate, monoalkyl phosphate, and sodium N-stearoylmethyl taurate.

The surfactant as the component (e) can be used either singly or in combination of two or more kinds, and the compounding amount thereof is 0.1 to 8.0% by weight, especially 0.1 to 0.1% by weight based on the total amount of the cosmetic. 5.
0% by weight is preferred.

The oily base of the component (f) is not particularly limited as long as it is used as a blending component of cosmetics, and examples thereof include vegetable oils, animal oils, synthetic oils, mineral oils, silicone oils, fatty acids, and higher grades. Examples thereof include alcohol, natural or synthetic glyceride, and intracellular lipid component. Specifically, as vegetable oils, almond oil, olive oil,
Cocoa oil, sesame oil, safflower oil, soybean oil, camellia oil,
Examples include Persic oil, castor oil, linseed oil, cottonseed oil, owl oil, coconut oil, macadamian nut oil, sunflower oil, jojoba oil, evening primrose oil, etc.,

Examples of animal oils include egg yolk oil, mink oil, cod liver oil, turtle oil, squalane oil and the like.

Examples of the synthetic oil include coconut fatty acid, oleic acid, stearic acid, palmitic acid, myristic acid, lauric acid, capric acid and caprylic acid, and methyl, ethyl, isopropyl, n-butyl, isobutyl, n-octyl, 2-ethylhexyl, n-decyl, isodecyl,
Ester compounds with lauryl, isotridecyl, myristyl, cetyl, stearyl, oleyl, behenyl, hexyldecyl, octyldodecyl, etc., further glyceryl tri (capryl / capric acid), glyceryl trioctanoate, trimethylolpropane triisostearate, neopentyl dioctanoate. Glycol, neopentyl glycol dicaprate, diisostearyl malate, di (2-heptylundecyl) adipate, isononyl isononanoate, isotridecyl isononanoate, octyldodecyl lactate, isostearyl myristate, cholesteryl hydroxystearate, sesquioleate Sorbitan, glyceryl oxystearate, diglyceryl isostearate, diglyceryl diisostearate, diisostearate Riseriru, diglyceryl tetra isostearate, 1-isostearoyl-3-myristoyl - such as glycerol and the like.

Examples of the mineral oil include liquid paraffin, ceresin, paraffin, microcrystalline wax, petrolatum and the like.

As the silicone oil, methylpolysiloxane, methylpolycyclosiloxane, methylphenylpolysiloxane, octamethylcyclotetrasiloxane,
Decamethyl cyclopentasiloxane, methyl polycyclosiloxane, dimethyl siloxane / methyl (polyoxypropylene) siloxane copolymer, dimethyl siloxane / methyl (polyoxyethylene) siloxane / methyl (polyoxypropylene) siloxane copolymer, methyl hydrogen Polysiloxane, highly polymerized methyl polysiloxane, alkyl modified silicone, alkoxy modified silicone, alkyl aralkyl modified silicone, amino modified silicone, epoxy modified silicone, alcohol modified silicone, carboxy modified silicone, fluoroalkyl modified silicone, fluorine modified silicone, etc. .

Examples of the fatty acid include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, undecylenic acid, lanolin fatty acid and isostearic acid.

Examples of higher alcohols include lauryl alcohol, cetanol, stearyl alcohol, oleyl alcohol, lanolin alcohol, hydrogenated lanolin alcohol, hexyldecanol and octyldodecanol.

Among the intercellular lipid components, natural products include
Examples include ceramides, cholesterols, fatty acids, etc. present in the skin and stratum corneum, and examples of synthetic products include ceramide analogs synthesized by the synthetic method described in JP-A-63-192703. Is mentioned. The oily base of the component (f) can be used singly or in combination of two or more, and the blending amount thereof is 0.01 in the total amount of the cosmetic.
It is preferably 90 to 90% by weight, particularly preferably 0.1 to 50% by weight.
In the cosmetic of the present invention, various optional components used in ordinary cosmetics, quasi-drugs, pharmaceuticals, etc. other than the above essential components can be blended, if necessary, within a range not impairing the effects of the present invention. .

Examples of such optional components include purified water,
Alcohol, moisturizer, emollient, medicinal agent, anti-fading agent, pigment, fragrance, antiseptic, texture improver, ultraviolet absorber,
Examples thereof include powders, antiphlogistics, antipruritic agents, bactericidal / disinfecting agents, hormone agents, pH adjusting agents, oil absorbing carriers and the like.

The cosmetic of the present invention can be produced by a conventional method,
It can be in various forms, for example, a water-in-oil type or an oil-in-water type cream, a lotion or a lotion.

[0032]

EFFECTS OF THE INVENTION Since the zinc ion is appropriately chelated in the cosmetic of the present invention, the binding of the zinc ion with the viscosity adjusting agent having an ionizing group is prevented, and the viscosity of the emulsion is lowered, separation, creaming, etc. Does not occur, is stable even after long-term storage, and has an excellent astringent effect.

[0033]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

Example 1 An oil-in-water emulsion having the composition shown in Table 3 was produced by the following production and evaluated by the following evaluation method. These results are also shown in Table 3.
Shown in.

(Production method) Components (1) to (3) and (8) to (12) heated and dissolved at the same temperature in an oil phase composed of components (4) to (7) heated to 80 ° C. and dissolved. ) Was added, and the mixture was homogenized and emulsified. Then, it cooled to room temperature, stirring, and obtained the O / W type emulsion.

(Evaluation method for astringent effect) Each cosmetic was applied to the eyes of a subject, and the presence or absence of tightness was sensory evaluated according to the following three-level evaluation criteria.

[0037]

[Table 1] ○: Tighten. Δ: Slightly tight. ×: Does not attract.

(Evaluation Method of Stability) Each emulsion was visually observed for the emulsified state when stored for 1 week at room temperature or 40 ° C., and evaluated according to the following three-step evaluation criteria.

[0039]

[Table 2] O: No change Δ: Separation or creaming occurred after 1 week. X: Separation or creaming occurred immediately after production.

[0040]

[Table 3]

From the results shown in Table 3, it can be seen that the product of the present invention is excellent in both the astringent effect and the stability.

Example 2 An oil-in-water emulsion having the composition shown in Table 4 was prepared by the following method, and the astringent effect and stability were evaluated by the same method as in Example 1. The results are shown in Table 4.

(Production Method) Components (1) to (6) and (11) to (15) heated and dissolved at the same temperature in an oil phase composed of components (7) to (10) heated to 80 ° C. and dissolved. ) Was added, and the mixture was homogenized and emulsified. Then, the mixture was cooled to room temperature with stirring to obtain an O / W type emulsion.

[0044]

[Table 4]

From the results shown in Table 4, the product of the present invention is excellent in astringent effect and stability, but has a chelate constant of 10
It can be seen that when a carboxylic acid smaller than ^-6 is used as the ligand, the stability is good, but the astringent effect cannot be obtained.

Example 3 A cosmetic having the composition shown in Table 5 was prepared according to the following production method,
The astringent effect and stability were evaluated in the same manner as in Example 1. The results are shown in Table 5.

(Manufacturing method) (1) to (3) is 2 / of (13)
In addition to 3 parts, (5) to (9) and (11) and (12) are mixed with the completely dissolved product. Then, 1 of (13)
(4) and (10) were added to / 3 volume and completely dissolved, and then added to the previously mixed mixture and completely dissolved.

[0048]

[Table 5]

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Claims (5)

[Claims] 1. The following components (a), (b), (c) and (d) (a) a compound that produces zinc ions in an aqueous solution (b) a viscosity modifier having an ionizing group (c) zinc ions A carboxylic acid or a salt thereof having a chelate constant of 10 ^-2 to 10 ^-6 with (d) water. 2. The cosmetic according to claim 1, wherein the component (a) is a zinc salt. 3. The cosmetic according to claim 1, wherein the component (b) is sodium polyacrylate, sodium carboxymethyl cellulose or xanthan gum. 4. The cosmetic according to claim 1, wherein the component (c) is citric acid, malonic acid or a salt thereof. 5. The cosmetic according to claim 1, wherein the cosmetic is an emulsion type.