JP2010173946A - Nail cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nail cosmetic that prevents whitening and embrittlement of nail. <P>SOLUTION: The nail cosmetic contains an extract of gardenia of the family Rubiaceae. The extract is preferably an extract with a polyhydric alcohol. The content of the extract is preferably 0.00001-0.1 mass%. The nail cosmetic preferably contains a nitrocellulose and an alkyl (meth)acrylate polymer. The nail cosmetic preferably further contains camphor and/or acetyl tributyl citrate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cosmetic, and more particularly to a cosmetic suitable for a nail cosmetic.

  Manicure and other nail cosmetics among young women can be easily applied to their nails with their favorite colors and patterns, and there are a wide variety of false nails, making them recently popular. ing. Such nail cosmetics are roughly classified into two types, a solvent type and an aqueous type. The solvent type is a dosage form in which a water-insoluble polymer having high gloss and high transparency such as nitrocellulose is dissolved in a solvent such as acetone or ethyl acetate. In order to impart plasticity to the film, it is customary to add a plasticizer to form a partial solid solution because the polymer coatings have a low plasticity and the film has the disadvantage of being easily detached due to cracks. is there. Further, in such a water-insoluble film imparted with plasticity, the release from a nail or the like is suppressed, so that it is usually dissolved and removed by a remover or the like. In such a system, the adhesion of the solid solution film and repeated solvent administration for removal are combined. In such a system, the nail is sometimes yellow and brittle and easily denatured. Development of a means to suppress the problem has been desired. As a means to suppress this, there is a technology for aqueous resin-dispersed nail cosmetics using an acrylic polymer emulsion, but at present, it is easy to dry, the uniformity of the makeup effect, and the maintenance of the cosmetic coating. However, it has not yet surpassed the solvent type. As a third approach that takes the middle of these two types, solvent-type cosmetics using a mixed film of nitrocellulose and acrylic resin have been developed. The phenomenon that the nail becomes white due to the interaction with the treatment with the solvent for removal, that is, the whitening phenomenon has been taken up as a new problem. The whitening phenomenon is not as severe as yellowing and embrittlement, but has become a problem to be solved.

  Since manicure is applied daily and removed with a remover, if it is applied and peeled off frequently, lipids in the nail are extracted together with the solvent by an organic solvent such as acetone in the component, and a whitening phenomenon that whitens the nail is observed Sometimes. As means for preventing such a whitening phenomenon, a nail lacquer remover containing ethanol, N-methyl-2-pyrrolidone, nitrocellulose, and other resin components in a certain ratio has been reported (for example, see Patent Document 1). Similarly, a manicure that does not remove excessive components in the nail that cause whitening during application and prevents whitening of the nail has been desired. Further, there has been a demand for a structure that can make the structure of the nail strong and prevent the nail from being weakened by applying manicure.

  An extract of Rubiaceae gardenia is used as a moisturizing ingredient in cosmetics (see, for example, Patent Document 2), but it is not used as a cosmetic for nails, and even more as an extract with polyhydric alcohol. It was never used for cosmetics. Naturally, the extract of Rubiaceae gardenia contains nitrocellulose and alkyl (meth) acrylate polymer, and nail cosmetics containing camphor and / or acetyltributyl citrate prevent whitening of the nail and weaken it. It was not known to prevent or suggested anything.

JP H11-240820 A JP 2000-327552 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide a nail cosmetic that prevents whitening and weakening of the nail by a cosmetic applied to the nail such as manicure.

In view of such a situation, the present inventors have found that a nail cosmetic containing a rhesus cuticle has such characteristics, and in particular, for a nail containing a rhesus cuticle. It became clear that the effect concerning the cosmetics for nails containing nitrocellulose and (meth) acrylic acid alkyl polymer, camphor and / or acetyltributyl citrate was remarkable, leading to the completion of the invention. . That is, the present invention is as follows.
<1> A cosmetic for nails, characterized by containing an extract of Rubiaceae gardenia.
<2> The nail cosmetic according to <1>, wherein the extract is an extract of a polyhydric alcohol.
<3> The nail cosmetic according to <1> or <2>, wherein the content of the extract is 0.00001 to 0.1% by mass.
<4> The nail cosmetic according to any one of <1> to <3>, wherein the nail cosmetic contains nitrocellulose and an alkyl (meth) acrylate polymer.
<5> The cosmetic for nails according to any one of <1> to <4>, further comprising camphor and / or acetyltributyl citrate.

  ADVANTAGE OF THE INVENTION According to this invention, the cosmetics for nail | claw which prevent the whitening and weakening of a nail | claw by use of cosmetics for nail | claw can be provided.

<1> Plant Extract of the Present Invention The nail cosmetic of the present invention is characterized by containing an extract of Rubiaceae gardenia as an essential component. Such an extract is not particularly limited as long as it is an extract extracted with an extraction solvent usually used in cosmetics, but polyhydric alcohols are particularly preferable, glycerin, ethylene glycol, diethylene glycol, triethylene glycol, Examples include ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, polyethylene glycol, propylene glycol, polypropylene glycol, and 1,3-butylene glycol. Extraction using these solvents may be carried out in accordance with conventional methods. For example, at room temperature, it may be immersed in about 10 times the amount of solvent for several days to about 10 days, and at a temperature near the boiling point, the same degree of solvent What is necessary is just to heat-immerse for several hours using. After removing the solvent, it may be distilled off under reduced pressure as usual, or the extract can be added to the cosmetic as it is after removing unnecessary substances. Among these extract preparation methods, the most preferred is an extract of 1,3-butylene glycol. Furthermore, what is marketed can use these extracts, and a gardenia extract (made by Koei Kogyo) can illustrate preferably. The preferable content of such an extract in the nail cosmetic of the present invention is preferably 0.00001 to 0.1% by mass, more preferably 0.0001 to 0% in total with respect to the total amount of the nail cosmetic. .1% by mass. This is because the effect is lowered below the lower limit, and the improvement of the effect cannot be expected even when the upper limit is exceeded.

<2> Polymer Compound of the Present Invention The nail cosmetic of the present invention contains, as a polymer compound, cellulose resins such as nitrocellulose and ethyl cellulose, alkyl acrylates such as alkyl acrylate and alkyl methacrylate, and the like. It is preferable. As the cellulose resin, nitrocellulose can be preferably exemplified, and as the alkyl acrylates, an alkyl (meth) acrylate polymer is preferable, and the alkyl (meth) acrylate polymer has an alkyl group having 2 to 12 carbon atoms (meta ) Acrylic acid alkyl ester and a vinyl monomer copolymerizable with the (meth) acrylic acid alkyl ester are copolymerized. Examples of the alkyl (meth) acrylate include ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and lauryl (meth) acrylate. As such an alkyl (meth) acrylate polymer, a commercially available one can be used, and preferred examples include Acryte SE1416AX2 (manufactured by Taisei Fine Chemical) and an alkyl acrylate copolymer (manufactured by Asanuma).

<3> Plasticizer of the Present Invention The nail cosmetic of the present invention preferably contains camphor and / or acetyltributyl citrate as a plasticizer. It is preferable to contain 0.5-10 mass% with respect to the whole quantity for the reason of exhibiting the effect which exhibits plasticity and prevents a nail | claw from becoming brittle.

<4> Cosmetics for nails of the present invention The cosmetics for nails of the present invention contain the above-mentioned essential components, and are cosmetics used for nails, specifically nail colors such as nail polish and pedicure, and nail enamel, It can be used as a nail coat, under nail or nail top coat. The cosmetic for nails of the present invention can contain any components that are usually used in cosmetics for nails, in addition to the above essential components. Examples of such optional components include organic solvents such as ethyl acetate, methyl acetate, isopropanol, ethanol, butanol, methyl ethyl ketone, and acetone, colorants such as organic dyes and metal oxides, ultraviolet absorbers such as benzophenone, Hydrocarbons such as squalane, petrolatum, microcrystalline wax, esters such as jojoba oil, carnauba wax, octyldodecyl oleate, triglycerides such as olive oil, beef tallow, coconut oil, stearic acid, oleic acid, lithinoleic acid, etc. Fatty acids, higher alcohols such as oleyl alcohol, stearyl alcohol, octyldodecanol, anionic surfactants such as sulfosuccinate and sodium polyoxyethylene alkylsulfate, amphoteric surfactants such as alkylbetaine salts, dia Cationic surfactants such as kill ammonium salts, sorbitan fatty acid esters, fatty acid monoglycerides, non-ionic surfactants such as polyoxyethylene adducts, polyoxyethylene alkyl ethers, polyoxyethylene fatty acid esters, thickening / gels Preferable examples include organic colorants such as redox agents, antioxidants, red No. 202, yellow No. 401, yellow No. 4, yellow No. 404 or lakes thereof. Further, the nail cosmetic of the present invention has a viscosity of 30 to 2000 mPa.s. sec, more preferably 45 to 1800 mPa.s. It is preferable to adjust the composition of the film component so that the viscosity is about sec. It is also suitable for nail removers and manicures, and in the case of such products, it contains powder, preferably surface-treated powder, more preferably hydrogenmethylpolysiloxane baking powder or dimethylpolysiloxane baking powder. The base powders of these treated powders include zinc oxide, titanium dioxide, bengara, iron oxide such as yellow iron oxide, black iron oxide, ultramarine, bitumen, talc, sericite, mica, titanium mica. Preferred examples include titanium sericite and silica.

  Hereinafter, the present invention will be described in more detail with reference to examples.

<Production Example 1>
To 500 g of ground garden plant, 5 L of 1,3-butanediol is added and extracted at room temperature for 3 days. The resulting extract is filtered to remove insolubles, concentrated and dried to obtain gardenia extract 1 Obtained.

<Examples and Comparative Examples>
Nail colors 1 to 4 which are cosmetics for nails according to the present invention were prepared according to the formulation shown below. That is, the prescription ingredients shown in Table 1 were mixed well and rolled to obtain nail colors 1 to 4 for nails of the present invention. Moreover, what substituted the gardenia extract of Example 1 by the butyl acetate was prepared as the comparative example 1. FIG. About these, 5 expert panelists used it for one week, and evaluated the whitening state of the nail according to the following criteria. As shown in Table 3, almost no whitening of the nail was observed in Examples 1 to 4 of the present invention, and clear nail whitening was observed in the comparative example. From this result, it was clarified that the nail cosmetic of the present invention can remarkably prevent nail whitening.
Score 1: No whitening of nails is observed. Score 2: Some whitening is observed. Score 3: Partial whitening is observed. Score 4: Partial whitening is clearly recognized. : Whitening of the entire nail is observed.

<Nail color change and vulnerability assessment>
Five subjects with healthy nails used the nail color of Examples 1 to 4 and the comparative example for one week, and the color change and vulnerability of the nails were evaluated according to the following criteria. As shown in Table 4, Examples 1 to 4 according to the present invention had no change in nail color tone, and the nail was as hard as before application, but in the comparative example, the nail was whitened and partially yellowed. The nail was partially fragile. From this, it has been clarified that the nail cosmetic of the present invention remarkably prevents discoloration of the nail and prevents the nail from being weakened by the use of the nail cosmetic.
Score 1: No discoloration of the nail is observed, and the nail state maintains the same hardness as before use. Score 2: Almost no discoloration of the nail is observed, and the condition of the nail is the same hardness as before use. Score 3: almost no discoloration of the nail is observed and the nail is slightly fragile Score 4: some discoloration of the nail is observed and a part of the nail is fragile Score 5: nail discoloration The discoloration is clear and the nails are clearly fragile

  The present invention can be applied to cosmetics such as cosmetics for nails.

Claims (5)

A cosmetic for nails characterized by containing an extract of Rubiaceae gardenia. The nail cosmetic according to claim 1, wherein the extract is an extract of a polyhydric alcohol. The nail cosmetic according to claim 1 or 2, wherein the content of the extract is 0.00001 to 0.1 mass%. The nail cosmetic according to any one of claims 1 to 3, wherein the nail cosmetic contains nitrocellulose and an alkyl (meth) acrylate polymer. 5. The nail cosmetic according to claim 1, further comprising camphor and / or acetyltributyl citrate.