Skin cosmetics

Abstract

The present invention provides an inconspicuous skin cosmetic that makes it possible to quickly and easily realize facial line lifting effects that last for a long time. The present invention relates to a skin cosmetic that is characterized by including (a) a film-forming polymer aqueous emulsion, (b) a water-soluble film-forming polymer, (c) a light-scattering agent, and (d) an aqueous solvent, the (b) water-soluble film-forming polymer being characterized in that, when (F1) is the maximum stress measured when 10 μl / cm2 of a 10% by mass aqueous solution of the polymer has been applied to the surface of a prescribed substrate and dried and then a pair of contacts are pressed against the portion of the substrate to which the polymer has been applied and then moved horizontally away from each other a prescribed distance, and (F0) is the maximum stress measured when the same operation is performed on the same portion of the same substrate without the aqueous solution of the polymer having been applied thereto, the value of (F1) is 2.2–10.0 times the value of (F0).

Description

[Technical field]

[0001] The present invention relates to a skin cosmetic that exerts an excellent lifting effect when applied to the skin. More specifically, the present invention relates to a skin cosmetic that provides a lifting effect that can be felt quickly and easily, and that maintains the effect for a long period of time while being unnoticeable in appearance. [Background technology]

[0002] As we age, our skin loses elasticity and flexibility, leading to noticeable wrinkles and sagging skin, which is a common concern for everyone. In particular, when the skin on the face loses elasticity and cannot resist gravity, it sags, causing the corners of the eyes to droop and the nasolabial folds to deepen, giving the impression of aging.

[0003] However, many people are reluctant to undergo medical procedures such as cosmetic surgery to remove wrinkles and sagging skin, due to the costs and risks involved. As a result, various cosmetics and methods have been proposed, particularly those aimed at smoothing the skin on the face and lifting the face line.

[0004] For example, Patent Documents 1 and 2 disclose a makeup method for lifting up the face line by using a mask with ear loops that covers the chin and / or cheeks, applying a cosmetic agent containing an active ingredient to the face, and then hanging the ear loops of the mask over the ears to physically lift up the chin and / or cheeks with the mask. However, it takes time to feel the lifting effect with these methods.

[0005] The skin topical preparation described in Patent Document 3 is said to be able to tighten the skin and lift sagging skin by applying the skin topical preparation to the entire face through the contraction of the blended resin component, and in fact, it is said that the application of the skin topical preparation shortens the length of the face from top to bottom (length from hairline to chin) by about 1 mm. However, the effect of "tightening the skin" and "lifting sagging skin" by the active ingredient (pullulan) in Patent Document 3 is interpreted as an effect of making the whole face feel tightened by the contraction of the resin film, similar to the "improvement of firmness" by the conventionally known water-soluble film-forming resin such as PVA. Such cosmetics have problems such as a feeling of tightness due to the resin film and wrinkles over time.

[0006] Also, a method has been proposed in which the wrinkles are stretched out or the sagging skin is pulled up with adhesive tape (Patent Document 4). This method can easily improve wrinkles and sagging, but there is a problem in that the applied tape itself reflects light and becomes more noticeable. Efforts have been made to make the tape (sheet) less noticeable, such as applying a specific cosmetic agent over the adhesive tape (Patent Document 5) or applying a sheet made of nanofibers with an adhesive containing specific fine particles (Patent Document 6). However, problems such as loss of convenience and inconvenience caused by the tape (sheet) peeling off have not been solved. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 4642135 [Patent Document 2] Patent No. 4695208 [Patent Document 3] WO2016 / 181828 publication [Patent Document 4] JP 2002-45232 A [Patent Document 5] Patent No. 5080075 [Patent Document 6] Patent No. 6248293 DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a skin cosmetic that can easily and quickly achieve a face line lifting effect, which effect lasts for a long time, and which is not noticeable in appearance. [Means for solving the problem]

[0009] In order to solve these problems, the present inventors have conducted extensive research to develop a skin cosmetic that can fix the skin without the use of adhesive tape (sheet) and that is inconspicuous when applied. As a result, they have found that a skin cosmetic that combines an aqueous polymer emulsion that forms a relatively soft film with a water-soluble polymer that forms a relatively hard film, and further contains a light scattering agent in the aqueous solvent, can solve the above problems, and have completed the present invention.

[0010] That is, the present invention relates to the following components (a) to (d): (a) an aqueous emulsion of a film-forming polymer; (b) a water-soluble film-forming polymer; (c) a light scattering agent; and (d) an aqueous solvent, The (b) water-soluble film-forming polymer is dissolved in a 10% by mass aqueous solution of the polymer at 10 μl / cm 2 and then pressing a pair of contacts against the application site of the substrate and horizontally moving the contacts a predetermined distance in a direction separating them from each other to measure the maximum stress (F1) that occurs when the contacts are pressed against the application site of the substrate and horizontally moved a predetermined distance in a direction separating them from each other, and measuring the maximum stress (F0) that occurs when the above operation is performed on the same site of the same substrate without applying the aqueous solution of the polymer. The skin cosmetic is characterized in that the value of the maximum stress (F1) when applied is 2.2 times or more and 10.0 times or less than the value of the maximum stress (F0) when not applied. Effect of the Invention

[0011] The skin cosmetic of the present invention has a quick-drying property that dries immediately after application to form a film, and the film formed is not noticeable in appearance and has appropriate toughness and flexibility, making it possible to keep the skin in place for a long time. Therefore, for example, by applying the skin cosmetic of the present invention to the area around the temples with the skin around the corners of the eyes pulled up and then allowing it to dry quickly, it is possible to quickly and easily fix the face line from the chin to the cheeks in a pulled-up state, and the firm face line can give the impression of a younger look. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic cross-sectional view showing a part of an apparatus suitable for measuring "maximum stress," which is a parameter for identifying a film-forming polymer in the present invention. [Diagram 2] FIG. 1 is an explanatory diagram showing (a) the change in the distance between the contacts and (b) the change in the stress detected by the contacts in response to the change, in one embodiment of the method for measuring the "maximum stress", which is a parameter for identifying a film-forming polymer in the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The skin cosmetic of the present invention will be described in detail below. The skin cosmetic of the present invention contains, as essential components, (a) an aqueous emulsion of a film-forming polymer, (b) a water-soluble film-forming polymer, (c) a light scattering agent, and (d) an aqueous solvent.

[0014] (a) Aqueous emulsion of film-forming polymer The "film-forming polymer aqueous emulsion" (component (a)) in the present invention is a dispersion of film-forming polymer particles in water (which may contain a hydrophilic solvent in addition to water). The average particle size of the polymer particles is not particularly limited, but is usually preferably about 0.01 to 5 μm.

[0015] The polymer constituting the polymer particles contained in the (a) film-forming polymer aqueous emulsion of the present invention is not particularly limited, and may be an acrylic, vinyl, urethane, or silicone homopolymer or copolymer.

[0016] Among the above polymers, an aqueous emulsion of a homopolymer or copolymer having a urethane structure is preferably used. Polyurethane is a reaction product of polyisocyanate and polyols, and its aqueous dispersion is called "polyurethane dispersion (PUD)" or "urethane resin emulsion", etc., and various commercial products are available.

[0017] Specific examples of the (a) film-forming polymer aqueous emulsion preferably used in the present invention include, for example, aqueous emulsions of polyurethane-10, acrylates copolymer, acrylic acid / methyl acrylate / methacrylamidopropyltrimethylammonium chloride copolymer, alkyl acrylate copolymer ammonium, (styrene / alkyl acrylate) copolymer ammonium, alkyl acrylate ester copolymer, and polyvinyl acetate, as indicated by their cosmetic ingredient names. Commercially available products corresponding to these include "Yodosol PUD", "Yodosol GH800F", "Yodosol GH34F", "Yodosol GH41F", "Yodosol GH810F", and "Yodosol GH820F" (all manufactured by Akzo Nobel), and "Viniplan GV-5651" (manufactured by Nissin Chemical Industry Co., Ltd.).

[0018] In addition to the above-mentioned "Yodozol" series of polymer aqueous emulsions, other suitable examples include "Rubyset PUR" (manufactured by BASF), "DynamX" (manufactured by Akzo Nobel), and the aqueous emulsion of silylated urethane polymer described in Patent No. 4699215. Among these commercially available products, "Yodozol PUD" is particularly preferred.

[0019] The blending amount of (a) the aqueous emulsion of a film-forming polymer in the skin cosmetic of the present invention is preferably 0.1 to 20 mass%, more preferably 0.3 to 10 mass%, and even more preferably 0.5 to 8 mass%, in terms of pure polymer content, relative to the total amount of the cosmetic.

[0020] (b) Water-soluble film-forming polymer The water-soluble film-forming polymer (component (b)) incorporated in the skin cosmetic of the present invention is a polymeric compound that forms a thin film on the skin when an aqueous solution of the polymer is applied to the skin and dried. Component (b) in the present invention is not particularly limited as long as it is a water-soluble polymer known as a "film-forming agent" that can be incorporated in cosmetics and the like (however, it is limited to those that satisfy the following requirements).

[0021] The requirement that the water-soluble film-forming polymer (b) of the present invention must satisfy is that the polymer should be dissolved in a 10% by weight aqueous solution at 10 μl / cm 2 The aqueous solution of the polymer is applied to the surface of a predetermined substrate and dried, and then a pair of contacts are pressed against the applied portion of the substrate, and the contacts are horizontally moved a predetermined distance in a direction separating them from each other to measure the maximum stress (F1) that occurs when the contacts are moved horizontally a predetermined distance in a direction separating them from each other, and the maximum stress (F0) that occurs when the same operation is performed on the same portion of the same substrate without applying the aqueous solution of the polymer is measured. The maximum stress (F1) when applied is within a range of 2.2 to 10.0 times the maximum stress (F0) when not applied. Here, the "predetermined substrate" refers to a sheet-like substrate having a certain degree of elasticity, and may be a polymer sheet such as an elastic rubber sheet, artificial skin, or human skin may be used as the substrate.

[0022] The above-mentioned "maximum stress" can be measured using a measuring device such as that described in Japanese Patent No. 3939984 and Japanese Unexamined Patent Publication No. 2013-13628. Fig. 1 is a schematic cross-sectional view showing a part of the structure of an apparatus suitable for carrying out the above-mentioned measurement. The apparatus includes a pair of roughly rod-shaped contacts (1), to which a detector (e.g., a strain gauge) (2) for detecting stress applied to the contacts (1) is connected. The contacts (1) are connected to a power unit (e.g., a motor) for moving the contacts in the horizontal direction in Fig. 1, and the detector (2) is connected to a transmission means for transmitting the detected stress as an electric signal.

[0023] The contact (1), detector (2) and power unit are preferably housed within a probe (3) as a single unit. It is also preferable that the movement of the contact (1), i.e., the operation of the power unit, is controlled by a control means such as a computer, and that the electrical signal corresponding to the detected stress from the detector (2) is also transmitted to the control unit via a transmission means, and is displayed, stored, or calculated and output in the desired format.

[0024] The measurement procedure begins with pressing a pair of contacts (1) against a target portion of a given substrate (step 1). Referring to Fig. 1, the tips (11) of the contacts (1) are pressed against the surface (101) of the substrate (100). In order to prevent the contact from slipping when it is moved, an adhesive layer or a high-friction layer may be provided between the tip (11) of the contact (1) and the substrate surface (101). The adhesive layer can be provided, for example, by attaching a double-sided adhesive tape to the tip (11) of the contact (1) or by applying an adhesive. The high-friction layer can be provided, for example, by applying rubber or sandpaper to the tip (11) of the contact (1).

[0025] Next, the pair of contacts (1) are moved a predetermined distance in a direction away from each other (in the direction shown by the arrow in FIG. 1) while keeping their tips in contact with the substrate surface (101) (step 2). Here, one of the pair of contacts (1) may be fixed and only the other moved, or both contacts may be moved.

[0026] In step 2, when the contacts (1) are moved in a direction away from each other, a tensile stress acts on the base against which the contacts are pressed, and a reaction force (stress) is generated in the contacts accordingly. In this measurement method, the reaction force (stress) is measured via a detector (2) (step 3).

[0027] Figure 2 shows the change in reaction force (stress) applied to the contacts (1) when the contacts pressed against the substrate surface (101) are moved. Figure 2(a) is a graph with time on the horizontal axis and the distance between the contacts on the vertical axis, and Figure 2(b) is a graph showing the change in stress applied to the contacts when the contacts are moved as shown in Figure 2(a).

[0028] When the contacts are again moved a specified distance (D) away from each other, the stress value increases rapidly to its maximum value. When the contacts are kept at the distance D for a specified time (T0), the stress value gradually decreases and approaches a constant value. When the contacts are then returned to their original positions, the stress value decreases from the initial steady-state value, and then gradually recovers and approaches a constant value. In this invention, "maximum stress" refers to the value of "F" in Figure 2(b). In other words, it is the difference between the steady-state value before the start of measurement and the maximum value of the measured stress.

[0029] The water-soluble film-forming polymer (b) of the present invention is defined as a polymer having a ratio [F1 / F0] (hereinafter referred to as "maximum stress ratio") of the maximum stress (F1) measured when the aqueous solution is applied to a given substrate under the above conditions to the maximum stress (F0) measured (on the substrate surface) without applying the aqueous polymer solution, that is, 2.2 to 10.0. The maximum stress ratio for the water-soluble film-forming polymer (b) is more preferably in the range of 2.2 to 8, and even more preferably 2.4 to 5.

[0030] Examples of the water-soluble film-forming polymer (b) preferably used in the skin cosmetic of the present invention include water-soluble polymers (also called "hair styling resins") that have traditionally been blended into hair styling products to enhance their hair styling power. Specific examples include the following.

[0031] (1) Betaine-based anionic polymers such as (methacryloyloxyethyl carboxybetaine / alkyl methacrylate) copolymers (Yukaformer (registered trademark) 301, Yukaformer (registered trademark) SM, etc., manufactured by Mitsubishi Chemical Corporation). (2) Vinylpyrrolidone-based polymer compounds such as polyvinylpyrrolidone and polyvinylpyrrolidone-vinyl acetate copolymers (e.g., BASF's Rubiscol K-60, K-90, VA73, etc.). (3) Polyvinyl alcohol, polyvinyl butyral, and other vinyl alcohol-based polymer compounds (such as Gohsenol (registered trademark) from Nippon Synthetic Chemical Industry Co., Ltd., Denka Poval (registered trademark) from Denka Corporation, etc.). (4) Acidic vinyl ether polymer compounds such as vinyl methyl ether / butyl maleate (Aniel BEM-42S from Osaka Organic Chemical Industry Co., Ltd., Gantrez ES-225 from ISP Co., Ltd., etc.). (5) Acrylic acid-based polymer compounds such as alkyl acrylate-alkyl methacrylate-diacetone acrylamide-methacrylic acid copolymer, alkyl acrylate copolymer, acrylic acid-acrylic acid amide-ethyl acrylate copolymer (RUVIMER 100P and ULTRAHOLD STRONG from BASF, Diahold (registered trademark) HR-200 from Mitsubishi Chemical Corporation, Plussize (registered trademark) L-53P from Goo Chemical Corporation, etc.). (6) Amphoteric acrylic acid-based polymer compounds such as N-methacryloyloxyethyl-N,N-dimethylammonium-α-N-methylcarboxybetaine-alkyl methacrylate copolymer, acrylic acid octylamide-hydroxypropyl acrylate-butylaminoethyl methacrylate copolymer (Yukaformer (registered trademark) AM-75 from Mitsubishi Chemical Corporation, Amphomer 28-4910 from Japan NSC Corporation, and RAM Resin-4000 from Osaka Organic Chemical Industry Co., Ltd.). (7) Nitrogen-containing cationic polymer compounds such as hydroxypropyl methylcellulose, hydroxyethyl cellulose dimethyl diallyl ammonium chloride copolymer, hydroxyethyl cellulose hydroxypropyl trimethyl ammonium chloride, vinylpyrrolidone-N,N'-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate solution, dimethyl diallyl ammonium chloride homopolymer, dimethyl diallyl ammonium chloride-acrylamide copolymer, and the like; oxyalkylene polymers such as PEG-90 (Metolose 60SH-50 from Shin-Etsu Chemical Co., Ltd., Polymer JR-125 from Amercol Co., Ltd., Leoguard (registered trademark) GP from Lion Corporation, Cellcoat L-200 from Nippon NSC Corporation, Gafcoat 734 from ISP Corporation, HC Polymer 1N from Osaka Organic Chemical Industry Co., Ltd., and Mercoat 550 and 2001 from Nalco Corporation, and the like). In addition, when the above-mentioned measurements were carried out on "carboxyvinyl polymer (carbomer)" and "crosslinked poly-gamma-sodium glutamate," which are water-soluble polymers used in cosmetics, etc., the maximum stress ratios (F1 / F0) were confirmed to be 1.15 and 0.94, respectively. Therefore, these water-soluble polymers are not included in component (b) of the present invention.

[0032] The amount of the film-forming polymer (component (b)) in the skin cosmetic of the present invention is preferably 0.1 to 20 mass%, more preferably 0.5 to 15 mass%, and even more preferably 1 to 10 mass%, in terms of pure polymer content, based on the total amount of the cosmetic.

[0033] On the other hand, the "maximum stress ratio" for (a) the aqueous film-forming polymer emulsion, i.e., the maximum stress ratio when the same measurement is carried out in the above-mentioned measurement method, but replacing the 10 mass % aqueous solution of (b) the water-soluble film-forming polymer with (a) the aqueous film-forming polymer emulsion, is preferably 1.0 or more and less than 2.2, preferably 2.0 or less, and more preferably 1.8 or less.

[0034] The "maximum stress ratio (F1 / F0)" value obtained by the above measurement is an index that represents the hardness (softness) of the film formed by the polymer, and a larger maximum stress ratio value indicates a harder film. In other words, it is believed that the skin cosmetic of the present invention forms a film that combines toughness and flexibility by appropriately mixing component (a), in which aggregated and fused polymer particles form a relatively soft film, and component (b), in which polymer chains are entangled to form a relatively hard film.

[0035] Therefore, in the skin cosmetic of the present invention, the blending ratio of component (a) to component (b) is preferably in the range of 10:1 to 1:10, more preferably 3:1 to 1:8, and even more preferably 2:1 to 1:5, calculated as the mass of the polymer solids. If the amount of component (b) is more than 10 times the amount of component (a), the elasticity of the film may be insufficient, which may lead to peeling or cracking. If the amount of component (b) is less than 1 / 10 of the amount of component (a), the film may not be able to hold itself in place on the skin.

[0036] The component (c) blended in the skin cosmetic of the present invention is a light scattering agent. By blending the light scattering agent (c), it is possible to eliminate the luster of the polymer film and give it a matte, inconspicuous appearance.

[0037] The light scattering agent (c) used in the present invention is a powder having a soft focus effect of making unevenness less noticeable by scattering light, and preferably an inorganic or organic powder dispersible in an aqueous solvent can be used. Such powders are not particularly limited as long as they are blended in cosmetics, etc., and include organic resin powders such as polymethyl methacrylate (PMMA), silicone elastomer powders such as (dimethicone / vinyl dimethicone) crosspolymer, inorganic powders such as silica, silicic acid (Li / Mg / Na), mica, talc, kaolin, etc., and one or a mixture of two or more of these can be used.

[0038] The amount of component (c) in the skin cosmetic of the present invention is preferably 1 to 20% by mass, more preferably 5 to 10% by mass, based on the total amount of the cosmetic. If the amount is less than 1% by mass, the effect of making the film less noticeable is not obtained, and if it is more than 20% by mass, the film tends to become brittle.

[0039] The skin cosmetic of the present invention contains an aqueous solvent (component (d)) as an essential component. As the aqueous solvent (component (d)), water and aqueous solvents are used. The aqueous solvent is preferably a solvent that is compatible with water and does not inhibit the water solubility of the (b) water-soluble film-forming polymer, and a typical example is a lower alcohol such as ethanol.

[0040] In the skin cosmetic of the present invention, it is preferable to shorten the time from application of the skin cosmetic to fixing the skin with a polymer film, i.e., the drying time until the solvent evaporates. The drying time is preferably within 1 minute 30 seconds, more preferably within 1 minute, and even more preferably within 30 seconds. In order to achieve such a drying time, it is preferable that the (c) aqueous solvent contains a volatile solvent such as ethanol in an amount of at least 20% by mass, preferably at least 30% by mass, based on the total amount of the cosmetic.

[0041] In addition to the above essential components, the skin cosmetic of the present invention may contain, depending on the type of cosmetic, appropriate components that are generally used as cosmetic components, as long as they do not impair the effects of the present invention. In particular, in order to hasten the drying time, volatile oils, for example, volatile hydrocarbons such as isododecane, and cyclic silicone oils such as hexamethylcyclotrisiloxane, octamethylcyclotetrasiloxane, and decamethylcyclopentasiloxane, may be added.

[0042] The skin cosmetic of the present invention has a quick-drying property in that it dries immediately after application to form a film, and the film formed has appropriate toughness and flexibility, making it possible to keep the film in place on the skin for a long period of time.

[0043] By using the cosmetic composition of the present invention having such properties, it is possible to quickly and easily fix the face line from the chin to the cheeks in a lifted position by, for example, applying the skin cosmetic composition of the present invention near the temples and allowing it to dry quickly while pulling the skin near the corners of the eyes upward with the fingers or pulling the eyebrows upward using the facial muscles.

[0044] Therefore, by utilizing the skin cosmetic of the present invention, a new makeup method can be proposed, which involves lifting the face line using the fingers or facial muscles, and applying the skin cosmetic of the present invention around the temples and allowing it to dry.

[0045] For example, by carrying out the makeup method just before going out, a person can easily and quickly achieve a youthful-looking face (expression) with firmer facial lines, and go out feeling good. The cosmetic method of the present invention may further include applying a foundation or the like to the applied area after the skin cosmetic has dried, which makes the cosmetic film even less noticeable. EXAMPLES

[0046] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. The blend amounts are shown in mass % unless otherwise specified.

[0047] A skin cosmetic was prepared by using (a) polyurethane-10 aqueous emulsion ("Yodosol PUD" (Akzo Nobel) (maximum stress ratio = 1.3)) as the film-forming polymer aqueous emulsion, (b) any one of water-soluble polymers having different "maximum stress ratios" as the water-soluble film-forming polymer, and (c) PMMA powder as the light scattering agent, blending 10 mass% each of components (a), (b), and (c), with the remainder being an aqueous solvent (water + ethanol).

[0048] The toughness and flexibility of the films formed after the solvent evaporated from the above-mentioned cosmetics were measured. The measurement results for each cosmetic are shown in Table 1. In this specification, the film formed by drying the cosmetic is assumed to be a linear elastic body (hook elastic body), and its extensibility (the degree to which it can be stretched without breaking) is referred to as "flexibility", and the force required to stretch it (corresponding to the spring constant) is referred to as "toughness".

[0049] <Measurement method> A predetermined amount of the cosmetic of each example was applied to the surface of a predetermined substrate (similar to that described in paragraph 0021) and dried to form a cosmetic film on the substrate surface. The substrate on which the cosmetic film was formed was stretched until its length increased to 1.5 times its original length, and the flexibility was evaluated based on the change in appearance of the film according to the following criteria. The toughness of the film was evaluated according to the following criteria based on the feel when the cosmetic film was pressed with the fingers.

[0050] <Evaluation criteria> (1)Flexibility 〇: No cracks △: Some cracks ×: Completely cracked (2) Resilience 〇: Hard (feels like paper) △: A little hard (feels like cellophane) ×: Soft (feels like food wrap)

[0051] [Table 1]

[0052] Next, skin cosmetics were prepared using the same raw materials as in the above Examples 1 to 3 and Comparative Examples 1 and 2, but with the amounts of (a) the aqueous emulsion of the film-forming polymer, (b) the water-soluble film-forming polymer, and (c) the light scattering agent each increased to 15% by mass, and were evaluated in the same manner as above. The results are shown in Table 2 below.

[0053] [Table 2]

[0054] As is clear from the results shown in Tables 1 and 2, when a polymer having a maximum stress ratio of less than 2.2 is used as the (b) water-soluble film-forming polymer, the toughness of the resulting film is insufficient. However, when a polymer having a maximum stress ratio of 2.2 or more is used, a film having both toughness and flexibility is formed. These results were the same even when the amounts of (a) the film-forming polymer aqueous emulsion, (b) the water-soluble film-forming polymer, and (c) the light scattering agent were changed.

[0055] Next, skin cosmetics were prepared according to the formulations shown in Table 3 below, and evaluations were carried out in the same manner as in Examples 1 to 6 above. The maximum stress ratio of the 4:3 (weight ratio) mixture of "hydroxypropyl methylcellulose" and "polyvinylpyrrolidone" used in Example 7 was "7.2", and the maximum stress ratio of the 1:1 (weight ratio) mixture of "(methacryloyloxyethyl carboxybetaine / alkyl methacrylate) copolymer" and "acrylic acid-methyl acrylate-methacrylamidopropyltrimethylammonium chloride copolymer" used in Example 8 was "6.4".

[0056] [Table 3]

[0057] Example 9 Skin cosmetics were prepared according to the formulations shown in Table 4 below. The cosmetic method of the present invention was carried out using the obtained skin cosmetics, and the drying time, staying power, and appearance were evaluated. "Drying time" refers to the time from application of a skin cosmetic to the formation of a dry film. The surface of the applied cosmetic was touched with a finger, and the time until the cosmetic no longer adhered to the finger was measured.

[0058] "Retention" is the duration that the skin remains elevated. The cosmetic method of the present invention was applied to half of the face of the subject, lifting only one side, and after 3 hours, a person other than the subject evaluated the results according to the following criteria. ○: It is possible to tell which side was applied even without the person pointing it out. △: If the person points it out, they can recognize which one it is. ×: The person cannot recognize either of them even when they point it out.

[0059] "Appearance" refers to the inconspicuousness of the film of the applied cosmetic material. The subjects applied each cosmetic composition to their faces, and a person other than the subjects observed them and evaluated them according to the following criteria. ◎: The applied area cannot be recognized even when viewed from a distance of 50 cm from the subject. ○: The applied area can be seen from a distance of 50 cm from the subject, but cannot be seen from a distance of 1 m. △: The applied area can be recognized even from a distance of 1 m from the subject.

[0060] [Table 4]

[0061] As shown in Table 4 above, it has been confirmed that the skin cosmetic composition of the present invention, which forms a film that is both flexible and tough, can quickly and easily achieve a lifting effect on the face line, the cosmetic film formed is not very noticeable, and the lifting effect can be sustained for a long time.

[0062] Skin cosmetics were prepared according to the formulations shown in Table 5. The skin cosmetics of Examples 10, 11, and 12 shown in Table 5 all formed films that were both flexible and tough.

[0063] [Table 5]

Claims

1. The following components (a) to (d): (a) an aqueous emulsion of a film-forming polymer; (b) a water-soluble film-forming polymer; (c) a light scattering agent; and (d) an aqueous solvent; The (a) film-forming polymer aqueous emulsion is a polyurethane-10 aqueous emulsion; the blending amount of the (a) aqueous emulsion of a film-forming polymer is in the range of 0.1 to 20% by mass, in terms of a pure polymer content, relative to the total amount of the cosmetic; The water-soluble film-forming polymer (b) is a 10% by mass aqueous solution of the polymer at 10 μl / cm ２ and then applying the aqueous solution of the polymer to a surface of a predetermined substrate and drying the surface, a pair of contacts are pressed against the applied portion of the substrate, and the contacts are horizontally moved a predetermined distance in a direction separating them from each other to measure a maximum stress (F1) that occurs when the contacts are horizontally moved a predetermined distance in a direction separating them from each other, and a maximum stress (F0) that occurs when the same portion of the same substrate is subjected to the above operation without applying the aqueous solution of the polymer, the value of the maximum stress (F1) when the aqueous solution of the polymer is applied is 2.2 times or more and 10.0 times or less than the value of the maximum stress (F0) when the aqueous solution of the polymer is not applied, The (b) water-soluble film-forming polymer is at least one selected from the group consisting of methacryloylethyl betaine acrylates copolymer, alkyl methacrylate (C1-C18) / N,N-dimethylaminoethyl methacrylate copolymer, and polyvinylpyrrolidone; the blending amount of the (b) water-soluble film-forming polymer is in the range of 0.1 to 20% by mass based on the total amount of the cosmetic; A skin cosmetic preparation, characterized in that the blending ratio of the polymer solid content of the (a) aqueous emulsion of a film-forming polymer to the (b) water-soluble film-forming polymer is within the range of 2:1 to 1:

5.

2. 2. The skin cosmetic according to claim 1, wherein the blending amount of the light scattering agent (c) is in the range of 1 to 20% by mass based on the total amount of the cosmetic.

3. 3. The skin cosmetic preparation according to claim 1 or 2, wherein the light scattering agent (c) is polymethyl methacrylate (PMMA) powder.

4. 4. The skin cosmetic according to claim 1, wherein the aqueous solvent (d) contains ethanol, and the amount of the ethanol contained is 30% by mass or more based on the total amount of the cosmetic.

5. A skin cosmetic preparation described in any one of claims 1 to 4, which does not contain trimethylsiloxysilicate.

6. A skin cosmetic preparation described in any one of claims 1 to 4, which does not contain carbon black.

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