JP2010064986A - Moisturizing cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for improving a moisturizing power without damaging use feeling in moisturizing gel cosmetics. <P>SOLUTION: This moisturizing cosmetic containing 15 to 30 mass% of a carboxyvinyl polymer which may be alkyl-modified and/or its salt and a polyhydric alcohol is provided, wherein the polyhydric alcohol is polyethylene glycol having a 15,000 to 25,000 mean molecular weight. The content of the polyethylene glycol having 15,000 to 25,000 molecular weight is preferably 0.1 to 1 mass%. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cosmetic, and more particularly to a cosmetic suitable as a moisturizing cosmetic.

  Moisturizing action is an important function in cosmetics, and by moisturizing the skin, the shape of stratum corneum cells can be changed to enhance the skin barrier function (see, for example, Patent Document 1). The importance of such a moisturizing action was recognized in relatively recent years, and before that, attention was focused on the emollient action using the occlusion / hydration action of oily components. Such changes in cosmetic ideas include hyaluronic acid and / or salts thereof, starch / sodium acrylate graft polymers, sorbitol condensates, extracts of plants of the genus Hyacinthaceae or biomolecule-like partial structures. The development of a new highly moisturizing material such as a coalescence or a copolymer also lies in the background (see, for example, Patent Document 2, Patent Document 3, Patent Document 4, and Patent Document 5). Furthermore, the development of preparations specializing in moisturizing action, such as moisturizing gel preparations, has also been a great impetus for the practical use of the materials.

  Such a moisturizing gel preparation usually includes an aqueous carrier containing a polyhydric alcohol at a high concentration using a carboxyvinyl polymer and / or a salt thereof or an alkyl-modified carboxyvinyl polymer or salt thereof as a gel structure substrate. Although it is a gel, depending on the type of polyhydric alcohol contained in the aqueous carrier that has been impregnated, there may be cases where the structural substrate is crushed and flakes like dirt are caused during use. Such a phenomenon tends to occur when a polyhydric alcohol such as high molecular weight polyethylene glycol having high moisture retention and excellent gel structure maintenance is contained. It can be said that there was a dilemma that impairs usability when selecting functionality.

  In some cases, the flaking is observed not only when a polyhydric alcohol is contained, but also when a water-soluble polymer such as hyaluronic acid and / or a salt thereof is contained. For this reason, in the moisturizing gel dosage form, it was necessary to pay close attention to the type of water-soluble polymer to be contained. For this reason, 1) the carboxyvinyl polymer and / or salt thereof, which may be alkyl-modified, and 2) a gel-like cosmetic containing 15 to 30% by mass of a polyhydric alcohol including polyethylene glycol, Polyethylene glycol was known only in a liquid state at room temperature with a low molecular weight (see, for example, Patent Document 6).

JP 2001-116745 A JP 2005-89454 A JP 2006-342122 A Japanese National Patent Publication No. 11-502102 JP 2002-3362 A JP 2001-335429 A

  The present invention has been made under such circumstances, and an object of the present invention is to provide a technique for improving the moisturizing property without impairing the usability of the moisturizing gel cosmetic.

In view of this situation, the present inventors have sought for a technique for improving the moisturizing property without impairing the usability of the moisturizing gel cosmetics. By selecting polyethylene glycol having an average molecular weight of 15,000 to 25000 as the polyhydric alcohol, it was found that the above problems can be solved, and the present invention has been completed. That is, the present invention is as follows.
<1> 1) In a cosmetic for moisturizing containing 1 to 30% by mass of a carboxyvinyl polymer and / or a salt thereof which may be alkyl-modified, and 2) a polyhydric alcohol. A cosmetic comprising polyethylene glycol having an average molecular weight of 15,000 to 25000 as an alcohol.
<2> The cosmetic according to <1>, wherein the content of polyethylene glycol having a molecular weight of 15,000 to 25000 is 0.1 to 1% by mass.
<3> The cosmetic according to <1> or <2>, wherein the content of the polyethylene glycol having a molecular weight of 15,000 to 25000 is 1 to 5% by mass with respect to the total amount of the polyhydric alcohol. .
<4> Furthermore, hyaluronic acid and / or a salt thereof, starch / sodium acrylate graft polymer, sorbitol condensate, extract of plant of the genus Hyacinthaceae and biomolecule-like partial structure as a moisture-retaining water-soluble polymer The cosmetic according to any one of <1> to <3>, comprising a polymer or copolymer selected from the group consisting of:
<5> The cosmetic according to any one of <1> to <4>, further comprising a polymer spherical powder.
<6> The cosmetic according to any one of <1> to <5>, which is a gel cosmetic.

  According to the present invention, it is possible to provide a technique for improving the moisturizing property without impairing the usability of the moisturizing gel cosmetic.

(1) Carboxyvinyl polymer which is an essential component of the cosmetic of the present invention The cosmetic of the present invention is characterized by containing an alkyl-modified carboxyvinyl polymer and / or a salt thereof as an essential component. . Carboxyvinyl polymers can be purchased and used as cosmetic raw materials. For example, “Hibiswaco” (Wako Pure Chemical Industries) series and “Carbopol” (BF Goodrich) ) Series (excluding “Carbopole 1382”) and the like. The alkyl-modified carboxyvinyl polymer is esterified by introducing an alkyl group having 10 to 30 carbon atoms into a part of the carboxyl group of the carboxyvinyl polymer, and “Pemlen TR-1” and “Pemlen” are commercially available products. TR-2 "and" Carbopol 1382 "(both manufactured by BF Goodrich) can be purchased and used. These alkyl-modified carboxyvinyl polymers can be used as a salt, and the salt can be used without particular limitation as long as it is used in a skin external preparation, such as sodium salt and potassium salt. Alkali metal salts such as alkali salts such as calcium salts and magnesium salts, organic amine salts such as ammonium salts, triethylamine salts, triethanolamine salts and monoethanolamine salts, basic amino acids such as lysine salts and alginates A salt etc. can be illustrated suitably. In the cosmetic of the present invention, such a component can contain only one species, or a combination of two or more species. The preferred content is an amount sufficient to maintain the gel state, specifically, it is 0.05 to 1% by mass in terms of the total amount in terms of a free form that is not a salt, more preferably 0.1 to 0.5% by mass. If the amount is too small, the gel structure may not be maintained. If the amount is too large, twisting or flaking during use may not be prevented.

(2) Polyhydric alcohol which is an essential component of the cosmetic of the present invention The cosmetic of the present invention is a cosmetic for moisturizing containing 15 to 30% by mass, preferably 20 to 27% by mass of a polyhydric alcohol. The polyhydric alcohol contains polyethylene glycol having an average molecular weight of 15000 to 25000, preferably 17000 to 23000. That is, in the cosmetic of the present invention, the total amount of polyhydric alcohol is specified as 15 to 30% by mass, preferably 20 to 27% by mass, thereby suppressing the occurrence of kinks during use of the gel. . Moreover, about the high molecular weight polyethyleneglycol, generation | occurrence | production of flaking is prevented by specifying the magnitude | size as the average molecular weight 15000-25000, Preferably, 17000-23000. The content of polyethylene glycol having an average molecular weight of 15000 to 25000, preferably 17000 to 23000 having such characteristics is preferably 0.1 to 1% by mass with respect to the entire cosmetic, and 0.2 to It is more preferable that it is 0.5 mass%, and it is preferable that it is 1-5 mass% with respect to the whole polyhydric alcohol, and it is more preferable that it is 1.2-3 mass%. The polyhydric alcohol in the cosmetics of the present invention can contain polyhydric alcohols usually used in cosmetics in addition to the polyethylene glycol having an average molecular weight of 15,000 to 25000, preferably 17000 to 23000. . Examples of the polyhydric alcohol include glycerin, diglycerin, dipropylene glycol, 1,3-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, isoprene glycol, Examples thereof include xylene glycol, maltitol, sorbitol, polyethylene glycol having an average molecular weight of less than 15000, polyethylene glycol having an average molecular weight exceeding 25000, and the like. Among these, polyethylene glycol having an average molecular weight exceeding 25000 may not be contained because it may impair usability due to flaking or twisting. Further, in order to improve microbial contamination while imparting moisture retention, dipropylene glycol, 1,3-butanediol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, A form containing 5 to 15% by mass, more preferably 8 to 15% by mass of one or more selected from isoprene glycol and hexylene glycol is also particularly preferable.

(3) Cosmetic of this invention The cosmetic of this invention contains the said essential component, It is an object for moisturizing skin. By using the cosmetic of the present invention, the moisture retention ability of the skin is improved, and this effect can be observed as an improvement in skin conductance and a decrease in transepidermal water transpiration value. In the cosmetic composition of the present invention, the carboxyvinyl polymer which may be alkyl-modified is solvated with the high molecular weight polyethylene glycol and has improved stability. Hyaluronic acid and / or a salt thereof, starch / sodium acrylate graft polymer, sorbitol condensate, extract of plant of the genus Hyacinthaceae and polymer or copolymer having biomolecule-like partial structure A water-soluble polymer having moisture retention such as a coalescence can be contained. Examples of the polymer or copolymer having a biomolecule-like partial structure include (meth) acryloyloxyethyl phosphorylcholine (a phosphorylcholine residue corresponds to a biomolecule-like partial structure), glucosylethyl (meth) acrylate (a glucosyl residue is a living body). Preferred examples include polymers and copolymers obtained by polymerization or copolymerization using a monomer such as (meth) acryloyllysine (lysine residue is equivalent to a biomolecule-like partial structure), etc. Suitable monomers for copolymerization include (meth) acrylic acid esters such as butyl (meth) acrylate, styrenes such as styrene and α-methylstyrene, and vinyl compounds such as vinyl acetate and isopropyl vinyl ether. It can be illustrated. Such polymers and copolymers already exist on the market, and such commercial products can be purchased and used. Preferred commercial products include “PM lysine” (polymethacryloyl lysine; manufactured by Gifu Shellac Co., Ltd.), “P-GEMA” (polyglucosylethyl methacrylate; manufactured by Nippon Seika Co., Ltd.), “Lipidure HM” (polymethacryloyloxyethyl). Preferred examples include phosphorylcholine (manufactured by NOF Corporation), “Lipidure MB” (methacryloyloxyethyl phosphorylcholine / butyl methacrylate copolymer; manufactured by NOF Corporation), and the like. Each of these components is preferably contained in an amount of 0.01 to 1% by mass. In the cosmetic of the present invention, since it is difficult to cause flaking and kinking in the makeup operation during use and after use, it is possible to prevent the water-soluble polymer having the moisturizing property from falling off from the skin, and excellent moisturizing. Expresses sex-imparting action.

  In addition to such components, the cosmetic of the present invention can contain optional components that are usually used in external preparations for skin. Such optional ingredients include, for example, macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, safflower oil, cottonseed oil, jojoba oil, coconut oil, palm oil, liquid lanolin, hydrogenated coconut oil Oil, wax, oil such as beeswax, canola wax, carnauba wax, ibotarou, lanolin, reduced lanolin, hard lanolin, jojoba wax, liquid paraffin, squalane, pristane, ozokerite, paraffin, ceresin, petrolatum , Hydrocarbons such as microcrystalline wax; higher fatty acids such as oleic acid, isostearic acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, undecylenic acid; cetyl alcohol, stearyl alcohol, isostearyl Higher alcohols such as alcohol, behenyl alcohol, octyldodecanol, myristyl alcohol, cetostearyl alcohol; cetyl isooctanoate, isopropyl myristate, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebacate, cetyl lactate, malic acid Diisostearyl, di-2-ethylhexanoic acid ethylene glycol, dicaprate neopentyl glycol, di-2-heptylundecanoic acid glycerin, tri-2-ethylhexanoic acid glycerin, tri-2-ethylhexanoic acid trimethylolpropane, tri Synthetic ester oils such as trimethylolpropane isostearate and pentane erythritol tetra-2-ethylhexanoate; dimethylpolysiloxane, methylphenylpoly Linear polysiloxanes such as oxane and diphenylpolysiloxane; cyclic polysiloxanes such as octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexanesiloxane; amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, Oil agents such as silicone oils such as modified polysiloxanes such as fluorine-modified polysiloxanes; Anionic surfactants such as fatty acid soap (sodium laurate, sodium palmitate, etc.), potassium lauryl sulfate, triethanolamine ether of alkyl sulfates; Cationic surfactants such as stearyltrimethylammonium, benzalkonium chloride, laurylamine oxide; imidazoline-based amphoteric surfactants (2-cocoyl-2-imida Zolinium hydroxide-1-carboxyethyloxy disodium salt, etc.), betaine surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), and amphoteric surfactants such as acylmethyl taurine; sorbitan fatty acid esters (sorbitan) Monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glyceryl monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), hardened castor oil derivatives, glycerin alkyl ethers, POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbite fatty acid esters (POE-sorbitol monolaurate, etc.), POE glycerin fatty acid ester Tells (POE-glycerol monoisostearate, etc.), POE fatty acid esters (polyethylene glycol monooleate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkyl phenyl ethers (POE nonylphenyl) Ethers, etc.), Pluronic types, POE / POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), Tetronics, POE castor oil / hardened castor oil derivatives (POE castor oil, POE hardened castor oil, etc.), Nonionic surfactants such as sucrose fatty acid esters and alkyl glucosides; moisturizing ingredients such as sodium pyrrolidonecarboxylate, lactic acid and sodium lactate; surface-treated mica, talc, kaolin, synthetic mica, Powders such as calcium oxide, magnesium carbonate, anhydrous silicic acid (silica), aluminum oxide, barium sulfate; surface may be treated, bengara, yellow iron oxide, black iron oxide, cobalt oxide, ultramarine, bitumen Inorganic pigments such as titanium oxide and zinc oxide; surface treated pearlescent agents such as titanium mica, fish phosphorus foil, bismuth oxychloride; red 202 and red 228 which may be raked , Red No. 226, Yellow No. 4, Blue No. 404, Yellow No. 5, Red No. 505, Red No. 230, Red No. 223, Orange No. 201, Red No. 213, Yellow No. 204, Yellow No. 203, Blue No. 1, Green Organic dyes such as 201, purple 201, red 204; organic powders such as polyethylene powder, polymethyl methacrylate, nylon powder, organopolysiloxane elastomer; Paraaminobenzoic acid UV absorbers; Anthranilic acid UV absorbers; Salicylic acid UV absorbers; Cinnamic acid UV absorbers; Benzophenone UV absorbers; Sugar UV absorbers; 2- (2'-hydroxy- UV absorbers such as 5'-t-octylphenyl) benzotriazole and 4-methoxy-4'-t-butyldibenzoylmethane; lower alcohols such as ethanol and isopropanol; vitamin A or a derivative thereof, vitamin B6 hydrochloride Vitamin B such as vitamin B6 tripalmitate, vitamin B6 dioctanoate, vitamin B2 or derivatives thereof, vitamin B12, vitamin B15 or derivatives thereof; vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, vitamin E acetate, etc. , Vitamin D, vitamin H, punt Phosphate, pantethine, vitamins pyrroloquinoline quinone such like; and antibacterial agents such as phenoxyethanol can be preferably exemplified. Among these, the oily component is preferably in a form that does not contain the oily component because it makes the moisturizing effect of the gel cosmetic of the present invention unclear. Moreover, transparency can be secured from an aesthetic point of view, which is preferable. Further, the gel thixotropic structure is broken at the time of use, and it has the effect of improving the spread of the cosmetic. Therefore, the resin powder processed into a spherical shape, particularly preferably polymethyl methacrylate is 0.1 to 10% by weight. More preferably, the content is 0.5 to 2% by mass. The inclusion of such a resin powder imparts thixotropic properties to the gel, so that it can be abraded to give the gel a feeling of disintegration and can provide this comfort. Therefore, if there are too many such resin powders, thixotropy will become strong and the usability may be impaired. On the other hand, if there are too few resin powders, there will be cases where the effect of improving stretch and the effect of improving usability cannot be obtained. From the standpoint of preserving power, 0.1 to 1% by mass of phenoxyethanol, and no lipophilic ethylparaben, propylparaben, and butylparaben, provide structural stability when using the gel. Since it improves, it is preferable. The gel cosmetic of the present invention can be produced by treating the essential components and optional components according to a conventional method. The cosmetic composition of the present invention thus obtained has an excellent effect of moisturizing the skin and, particularly, the stratum corneum, and thus has an action of increasing the flatness of stratum corneum cells and improving the skin barrier function. Therefore, the cosmetic of the present invention is preferably applied to a skin conditioning cosmetic or applied to a makeup base.

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

  According to the prescription shown below, the gel cosmetics which are the cosmetics (skin preparation cosmetics) of this invention were obtained. That is, the components (a), (b), and (c) were heated to 80 ° C., and (d) was added to (i) to be dispersed, and (ii) was gradually added thereto to uniformly disperse. C was added thereto and stirred, neutralized, stirred and cooled to obtain a gel cosmetic 1. In the same manner, Comparative Example 1 in which polyethylene glycol 20000 was replaced with polyethylene glycol 10000, Comparative Example 2 in which polyethylene glycol 30000 was replaced, and Comparative Example 3 in which polyethylene glycol 1500 was replaced were also produced in the same manner.

  The moisturizing effects of the gel cosmetic 1 and Comparative Examples 1 to 3 were examined using a paneler. That is, five 3 cm × 4 cm portions were provided on the inner side of the forearm, one portion was not treated, and portions 2 to 5 were lightly rubbed with 30 mg of each cosmetic material three times to apply the cosmetic. After applying, let the patient rest for 1 hour, rinse the cosmetic lightly with warm water, let stand for 5 minutes, collect the stratum corneum cells using an adhesive disk, and average projection of the stratum corneum cells using an atomic force microscope The area (μm 2) was calculated. The results are shown in Table 2. From this, it can be seen that the gel cosmetic of the present invention is excellent in moisture retention, promotes flattening of the stratum corneum cells, and improves the stratum corneum barrier function.

  About the moisturizing effect of the gel cosmetics 1 and Comparative Examples 1 to 3, the feeling of use was evaluated using a specialized panelist. Evaluation criteria are score 1: not very good, score 2: neither good nor bad, score 3: good feeling, score 4: good, score 5: very good, evaluation items are extended at the time of use The lightness, the moist feeling after application, and the persistence of the moist feeling were evaluated, and the evaluation was performed in a thermostatic chamber at 25 ° C. Three specialized panelists were used, and the use site was the forearm inner side. The results are shown in Table 3. This table also proves the high moisturizing effect and good feeling of use of the present invention. In addition, it is considered that the sustainability is caused by the fact that there are few cosmetics that fall off due to dripping at the time of application.

  In the same manner as in Example 1, a gel cosmetic 2 shown below was prepared. The effect of this on the stratum corneum cells was the same when the treatment was 1401 μm 2 compared to 1532 μm 2 for the untreated when tested by the test procedure of Example 1 (number of cases 1). The feeling of use was a lightness score of 4, a moist feeling score after application, and a moist feeling persistence score of 4. The effect of the spherical powder on the spread and uniform applicability was confirmed.

  In the same manner as in Example 1, a gel cosmetic 3 shown below was prepared. The effect of this product on the stratum corneum cells was the same as that obtained when the treatment was 1379 μm 2 versus the untreated 1497 μm 2 when tested by the test procedure of Example 1 (number of cases 1). In addition, the feeling of use has a lightness score of 4, a moist feeling score after application, and a moist feeling persistence score of 4, and it is understood that it is preferable to contain a carboxyvinyl polymer which is not alkyl-modified.

  In the same manner as in Example 1, a gel cosmetic 4 shown below was prepared. When this was tested with the test procedure of Example 1 (number of cases 1), the same effect was observed when the treatment was 1321 μm2 versus the untreated 1444 μm2. In addition, the feeling of use has a lightness score of 5, a moist feeling score after application, and a moist feeling sustainability score of 5. A polymer having methacryloyloxyethyl phosphorylcholine as a constituent monomer can provide the same effect. I understand.

The present invention can be applied to cosmetics.

Claims (6)

1) A carboxyvinyl polymer and / or salt thereof, which may be alkyl-modified, and 2) a cosmetic for moisturizing containing 15 to 30% by weight of a polyhydric alcohol. A cosmetic comprising polyethylene glycol having an average molecular weight of 15,000 to 25,000. The cosmetic according to claim 1, wherein a content of the polyethylene glycol having a molecular weight of 15,000 to 25000 is 0.1 to 1% by mass. The cosmetic according to claim 1 or 2, wherein the content of the polyethylene glycol having a molecular weight of 15,000 to 25000 is 1 to 5% by mass with respect to the total amount of the polyhydric alcohol. Furthermore, hyaluronic acid and / or a salt thereof, starch / sodium acrylate graft polymer, sorbitol condensate, extract of plants of the genus Hyacinthaceae, and a biomolecule-like partial structure as a water-retaining polymer having moisture retention. The cosmetic according to any one of claims 1 to 3, comprising a material selected from a coalescence or a copolymer. Furthermore, polymeric spherical powder is contained, Cosmetics in any one of Claims 1-4 characterized by the above-mentioned. The cosmetic according to any one of claims 1 to 5, which is a gel cosmetic.