Method for producing aqueous composition for body

Abstract

To provide a method for producing an aqueous composition for body enabling formation of a film that exhibits vapor barrier performance under low-humidity conditions and exhibits vapor release performance under high-humidity conditions.SOLUTION: A method for producing an aqueous composition for body comprises: (A) an anionic polymer with a viscosity of 1,500 mPa s or more at 25°C in a 2 mass% aqueous solution; (B) a cationic polymer; (C) one or more selected from the group consisting of water-swelling clay minerals and water-swelling mica; and water, the method comprising the following step 1 and step 2 in sequence. Step 1: preparing a mixture 1 containing (A) the anionic polymer with a viscosity of 1,500 mPa s or more at 25°C in a 2 mass% aqueous solution, (C) one or more selected from the group consisting of water-swelling clay minerals and water-swelling mica, and water. Step 2: mixing the mixture 1 with (B) the cationic polymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for producing an aqueous composition for the body.

Background Art

[0002] As a method for imparting various properties such as gloss and good feel to keratin substances such as skin and hair, a technique for forming a cosmetic film on the surface of the keratin substance is known. From the viewpoint of achieving both film-forming properties and ease of adaptation to the skin, water-soluble polymers are used in film-forming cosmetics for the skin (see, for example, Patent Documents 1 to 3).

[0003] Patent Document 1 describes that a solid powder cosmetic containing a powder, an acrylic acid-based polymer, and a water-swellable clay mineral is excellent in dropping strength and also excellent in smooth feel, adhesiveness, and the like. Patent Document 2 discloses that an emulsion composition having a standard deviation of emulsion particle diameter of 0.5 or more can achieve a smooth and soft elongation while having a sufficient richness and a sense of moderation that gives a feeling of change. It is also described that the emulsion composition contains a hydrogel-forming agent, an organically modified clay mineral, and the like. Patent Document 3 discloses that an oil-in-water type cosmetic composition for preventing bleeding, which contains a compound that is solubilized by neutralization as an active ingredient, prevents bleeding and exhibits good stability. It is also described that the cosmetic composition contains a gelling agent, water, and a powder component.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, it is known that skin damage is caused by severe humidity environments. For example, in a low humidity environment, problems due to dryness occur, and in a high humidity environment, the stratum corneum becomes congested and over-swollen, making the skin vulnerable to irritants. The stratum corneum of the skin adjusts the amount of water evaporation or absorption from the skin surface in response to the surrounding environment and functions to protect the skin. However, in daily life, the human skin is repeatedly exposed to severe humidity changes, such as when moving from an air-conditioned indoor environment to the outdoors. Therefore, there is a concern that the function of the stratum corneum cannot fully respond to humidity changes, and damage accumulates on the skin.

[0006] Therefore, there is a need for an external preparation technology that can adjust the amount of moisture on the skin surface in response to the surrounding environment like the stratum corneum and can suppress skin damage in both low humidity and high humidity environments. Specifically, in a low humidity environment, it exhibits a water vapor barrier property to enhance the moisturizing property of the skin, and in a high humidity environment, the water vapor barrier property decreases and switches to a water vapor releasing property, so that a film that does not prevent the release of water vapor from the stratum corneum can be formed. With conventional technologies for forming hydrophobic films, although it is possible to impart a water vapor barrier property to the skin, it does not exhibit an environmental responsiveness that can adjust the water vapor barrier property according to humidity.

[0007] The present invention relates to a method for producing a body aqueous composition capable of forming a film that exhibits a high water vapor barrier property in a low humidity environment and a water vapor releasing property in a high humidity environment.

Means for Solving the Problems

[0008] The present inventors have found that the above problems can be solved by producing a body aqueous composition containing water and at least one selected from the group consisting of a predetermined anionic polymer, a cationic polymer, a water-swellable clay mineral, and a water-swellable mica by a predetermined method. That is, the present invention relates to a method for producing an aqueous composition for the body, wherein the composition contains (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) a cationic polymer, (C) one or more selected from the group consisting of a water-swellable clay mineral and water-swellable mica, and water, and has the following steps 1 and 2 in this order. Step 1: A step of preparing a mixture 1 containing (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (C) one or more selected from the group consisting of a water-swellable clay mineral and water-swellable mica, and water Step 2: A step of mixing the mixture 1 with (B) a cationic polymer

Effects of the Invention

[0009] According to the production method of the present invention, it is possible to provide an aqueous composition for the body that can form a film exhibiting high water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment. The composition has film-forming properties and can be used as various cosmetic compositions.

Modes for Carrying Out the Invention

[0010] [Definitions] As used herein, the term "aqueous composition for the body" means an aqueous composition used for treating the surface of the body, such as the surface of keratin substances such as skin, hair, eyelashes, eyebrows, nails, etc. The term "aqueous composition" means a composition having water as a main component, preferably a composition having a water content of 50% by mass or more. The aqueous composition for the body (hereinafter, also simply referred to as "aqueous composition" or "composition") is preferably an aqueous composition for keratin substances, more preferably an aqueous composition for skin or hair, and still more preferably an aqueous composition for skin. The "keratin substance" as used herein means a keratin substance constituting a body part of an animal such as a human, such as hair, skin, nails, etc. As used herein, the phrase "containing component X" also includes blending component X.

[0011] In this specification, the water vapor barrier property in a low humidity environment is defined by the water vapor barrier property at a relative humidity of 40%, and the water vapor barrier property in a high humidity environment is defined by the water vapor barrier property at a relative humidity of 80%. In the present invention, when the water vapor barrier property at a relative humidity of 40% is high, it can be regarded as "exhibiting a high water vapor barrier property in a low humidity environment". In addition, in the following description, the property of exhibiting a water vapor barrier property in a low humidity environment and a water vapor release property in a high humidity environment may be referred to as "environmental responsiveness". In this specification, it can be considered that the higher the difference between the water vapor barrier property at a relative humidity of 40% and the water vapor barrier property at a relative humidity of 80%, the higher the environmental responsiveness. The environmental responsiveness can be specifically evaluated by the method described in the examples.

[0012] [Method for producing an aqueous composition for the body] The present invention relates to a method for producing an aqueous composition for the body (hereinafter also referred to as "the production method of the present invention"), wherein the composition contains (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) a cationic polymer, (C) one or more selected from the group consisting of a water-swellable clay mineral and water-swellable mica, and water, and has the following steps 1 and 2 in sequence. Step 1: A step of preparing a mixture 1 containing (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (C) one or more selected from the group consisting of a water-swellable clay mineral and water-swellable mica, and water Step 2: A step of mixing the mixture 1 with (B) a cationic polymer

[0013] According to the production method of the present invention, it is possible to provide an aqueous composition for the body that can form a film exhibiting a high water vapor barrier property in a low humidity environment and a water vapor release property in a high humidity environment.

[0014] The reason why the production method of the present invention exhibits the above effects is not clear, but it is considered as follows. Since both the anionic polymer as component (A) and the cationic polymer as component (B) have film-forming properties and are hydrophilic hydrogels, they can form a film whose properties change triggered by moisture absorption and which can exhibit environmental responsiveness. Furthermore, component (A) and component (B) can interact to form a polyion complex. The film containing the polyion complex has a crosslinked structure and is hydrophobic, enabling the formation of a film with high water resistance and abrasion resistance. However, using only these polymers has limitations in improving the water vapor barrier property in a low humidity environment.

[0015] Component (C) is a plate-like mineral. When component (C) is added to components (A) and (B) to form a film, in the film, the plate-like surfaces of component (C) are dispersed so as to be substantially parallel to the film surface. And when water vapor permeates in the thickness direction of the film, it is considered that the so-called "labyrinth effect" is exhibited, in which the presence of component (C) lengthens the permeation path of water vapor. It is considered that the improvement effect of the water vapor barrier property can be obtained by this labyrinth effect. On the other hand, when component (C) aggregates, there is a problem that sufficient water vapor barrier property due to the labyrinth effect cannot be obtained. Here, since the surface of component (C) is usually negatively charged, when the cationic polymer as component (B) is present in the composition, component (B) and component (C) interact and tend to aggregate. In the production method of the present invention, first, a mixture 1 containing (A) one or more selected from the group consisting of a predetermined anionic polymer, (C) a water-swellable clay mineral and a water-swellable mica, and water is prepared (step 1), and then the mixture 1 and (B) a cationic polymer are mixed (step 2). Since component (A) is anionic and component (C) is also negatively charged, in step 1, charge repulsion occurs between component (A) and component (C), making it easier for component (C) to be dispersed in the aqueous composition. As a result, even when component (B) is mixed in step 2, it is considered that aggregation of component (C) can be suppressed. Furthermore, since component (C) is water-swellable and has a high affinity for the aqueous composition, it is considered that it is difficult to aggregate even in the formed film. On the other hand, for example, when component (B) and component (C) are first mixed and then component (A) is mixed, it is considered that component (B) and component (C) interact with each other, becoming more likely to aggregate and making it impossible to obtain sufficient water vapor barrier properties.

[0016] Furthermore, since all of components (A) to (C) are hydrophilic, the film containing components (A) to (C) is sensitive to the ambient humidity and absorbs moisture and swells in a high humidity environment. Therefore, in a high humidity environment, as the film swells, the dispersion state of component (C) in the film changes, defects occur in the maze structure in the film, and the water vapor barrier property is not exhibited, resulting in a change in water vapor permeability. Also, when the viscosity of a 2 mass% aqueous solution of component (A) at 25°C is equal to or higher than a predetermined value, it is considered that defects are less likely to occur in the maze structure in the formed film, and the water vapor barrier property can be further improved.

[0017] Hereinafter, the components contained in the aqueous composition obtained by the production method of the present invention will be described. <Component (A): Anionic polymer> The anionic polymer which is component (A) means a polymer having an anionic group and being negatively charged as a whole. The anionic group is an anionic group or a group that can be ionized to become an anionic group. Specifically, examples include one or more selected from the group consisting of acidic groups such as carboxy group, sulfonic acid group, sulfuric acid group, and phosphoric acid group. Preferably, it is one or more selected from carboxy group, sulfonic acid group, and sulfuric acid group, and more preferably sulfonic acid group or sulfuric acid group. At least a part of the anionic group may be neutralized and in a salt state.

[0018] The viscosity at 25°C of a 2% by mass aqueous solution of component (A) is 1,500 mPa·s or more, preferably 3,000 mPa·s or more, more preferably 5,000 mPa·s or more, still more preferably 10,000 mPa·s or more, even more preferably 30,000 mPa·s or more, even more preferably 50,000 mPa·s or more, even more preferably 70,000 mPa·s or more, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness. Also, from the viewpoint of improving the coatability of the aqueous composition, it is preferably 200,000 mPa·s or less, more preferably 150,000 mPa·s or less, still more preferably 100,000 mPa·s or less. And the viscosity at 25°C of a 2% by mass aqueous solution of component (A) is 1,500 mPa·s or more, preferably 1,500 mPa·s or more and 200,000 mPa·s or less, more preferably 3,000 mPa·s or more and 200,000 mPa·s or less, still more preferably 5,000 mPa·s or more and 200,000 mPa·s or less, even more preferably 10,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 30,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 50,000 mPa·s or more and 100,000 mPa·s or less, even more preferably 70,000 mPa·s or more and 100,000 mPa·s or less. When the viscosity at 25°C of a 2% by mass aqueous solution of component (A) is a predetermined value or more, it is considered that defects are less likely to occur in the maze structure in the formed film and the water vapor barrier property is further improved. The viscosity of a 2% by mass aqueous solution of component (A) can be measured by the method described in the examples.

[0019] Component (A) preferably contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group, (A2) an anionic polymer having a structural unit represented by the following general formula (1), and (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness. In the present specification, "(meth)acrylic acid" means acrylic acid or methacrylic acid, and "(meth)acrylate" means acrylate or methacrylate. [Chemical formula] In formula (1), R 1 is a hydrogen atom or a methyl group, and M is a hydrogen atom, an alkali metal, or ammonium.

[0020] (Component (A1): Anionic polysaccharide having a sulfonic acid group or a sulfate group) Examples of the anionic polysaccharide as component (A1) include natural polysaccharides and semi-synthetic polysaccharides derived from natural polysaccharides, and any of these can be used. Examples of the natural polysaccharide as component (A1) include carrageenan, chondroitin sulfate, keratan sulfate, dermatan sulfate, heparin, heparan sulfate, and salts thereof. Examples of the semi-synthetic polysaccharide as component (A1) are preferably cellulose derivatives or starch derivatives having a sulfonic acid group or a sulfate group, more preferably cellulose derivatives having a sulfonic acid group or a sulfate group, and still more preferably cellulose derivatives having a sulfonic acid group. Examples of the cellulose derivative having a sulfonic acid group preferably include cellulose derivatives having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, preferably 12 to 22 carbon atoms, more preferably 18 to 22 carbon atoms, and more preferably cellulose derivatives having a sulfonic acid group and an alkyl group having 8 to 24 carbon atoms, preferably 12 to 22 carbon atoms, more preferably 18 to 22 carbon atoms. Specific examples thereof include stearoxy PG hydroxyethyl cellulose sulfonic acid or a salt thereof. Examples of the starch derivative having a sulfonic acid group or a sulfate group include sulfated starch or a salt thereof. When component (A1) is a salt, examples of the salt include alkali metal salts such as sodium salts and potassium salts, and ammonium salts. From the perspective of availability, an alkali metal salt is preferred.

[0021] Among the above, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low-humidity environment, improvement of environmental responsiveness, and availability, component (A1) is preferably a semi-synthetic polysaccharide, more preferably a cellulose derivative having a sulfonic acid group or a sulfate group, still more preferably a cellulose derivative having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, even more preferably a cellulose derivative having a sulfonic acid group and a hydrophobic group having 8 to 24 carbon atoms, even more preferably at least one selected from the group consisting of stearoxy PG hydroxyethyl cellulose sulfonic acid or a salt thereof, and even more preferably sodium stearoxy PG hydroxyethyl cellulose sulfonate.

[0022] (Component (A2): An anionic polymer having a structural unit represented by General Formula (1)) Component (A2) is an anionic polymer having a structural unit represented by the following General Formula (1).

Chemical formula

[0023] R in General Formula (1) 1 is preferably a hydrogen atom from the perspective of availability, and M is preferably an alkali metal or ammonium, more preferably sodium or ammonium.

[0024] Component (A2) may be a polymer containing other structural units in addition to the structural unit represented by the general formula (1). Examples of such other structural units include structural units derived from vinyl pyrrolidone, (meth)acrylic acid or its salts, (meth)acrylic acid alkyl esters, hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, acrylamides such as N,N-dimethylacrylamide, and the like. Component (A2) may also be a cross-polymer.

[0025] Specific examples of component (A2) include sodium polyacryloyldimethyltaurine, ammonium polyacryloyldimethyltaurine, (sodium acrylate / sodium acryloyldimethyltaurine) copolymer, (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer, (ammonium acryloyldimethyltaurine / VP) copolymer, polyacrylate cross-polymer-6 (ammonium acryloyldimethyltaurine, dimethylacrylamide, lauryl methacrylate and laureth-4 methacrylate), (sodium acrylate / sodium acryloyldimethyltaurine / dimethylacrylamide) cross-polymer, (ammonium acryloyldimethyltaurine / beheneth-25 methacrylate) cross-polymer, and the like. One or more of these can be used. Among these, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and availability, preferably one or more selected from the group consisting of (sodium acrylate / sodium acryloyldimethyltaurine) copolymer, (2-hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymer, (ammonium acryloyldimethyltaurine / VP) copolymer, and polyacrylate cross-polymer-6.

[0026] (Component (A3): An anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid) Component (A3) is an anionic polymer other than (A2) that has a structural unit derived from (meth)acrylic acid, and is an anionic polymer having a carboxy group as an anionic group. At least a part of the carboxy group may be neutralized and in the form of a salt. Examples of the anionic polymer having a structural unit derived from (meth)acrylic acid include a homopolymer of (meth)acrylic acid and a copolymer of (meth)acrylic acid and another monomer. Examples of the homopolymer of (meth)acrylic acid include polyacrylic acid, polymethacrylic acid, and salts thereof. Examples of the copolymer of (meth)acrylic acid include (meth)acrylic acid / maleic acid copolymer, (meth)acrylic acid / itaconic acid copolymer, (meth)acrylic acid / fumaric acid copolymer, (meth)acrylic acid / vinyl acetate copolymer, (meth)acrylic acid / (meth)acrylic acid alkyl ester copolymer, (meth)acrylic acid / 2-hydroxyethyl methacrylate copolymer, acrylic acid / acrylic acid alkyl ester / (N-alkyl)acrylamide copolymer, and salts thereof, and one or more of these can be used. Among these, as the copolymer of (meth)acrylic acid, (meth)acrylic acid / (meth)acrylic acid alkyl ester is preferable, and acrylic acid / acrylic acid alkyl ester is more preferable. Examples of the (meth)acrylic acid alkyl ester include (meth)acrylic acid alkyl esters in which the alkyl has preferably 1 or more carbon atoms, more preferably 4 or more carbon atoms, still more preferably 8 or more carbon atoms, preferably 40 or less carbon atoms, more preferably 36 or less carbon atoms, and still more preferably 32 or less carbon atoms.

[0027] Specific examples of component (A3) include carboxyvinyl polymer or its salt, (acrylates / acrylic acid alkyl (C10-30)) cross polymer, acrylate cross polymer-4, etc.

[0028] Component (A) preferably contains one or more selected from the group consisting of components (A1) to (A3), more preferably one or more selected from the group consisting of component (A1) and component (A2), from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness. When component (A) contains one or more selected from the group consisting of component (A1) and component (A2), the total content of component (A1) and component (A2) in component (A) is preferably 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, even more preferably 80% by mass or more, even more preferably 90% by mass or more, and 100% by mass or less, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness.

[0029] Also, component (A) preferably contains one or more selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, (ammonium acryloyldimethyltaurate / VP) copolymer, polyacrylate cross polymer-6, and carboxyvinyl polymer, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness. More preferably, it contains one or more selected from the group consisting of sodium stearoxy PG hydroxyethyl cellulose sulfonate, (sodium acrylate / sodium acryloyldimethyltaurate) copolymer, (hydroxyethyl acrylate / sodium acryloyldimethyltaurate) copolymer, and polyacrylate cross polymer-6.

[0030] As the component (A), a commercially available anionic polymer can also be used. Specific examples thereof include "SPS-S-SA" (sodium stearoxy PG hydroxyethyl cellulose sulfonate) manufactured by Kao Corporation, "Simulgel EG QD" ((sodium acrylate / sodium acryloyldimethyltaurine) copolymer), "SEPINOV EMT10", "Sepiplus S", "Simulgel FL", "Simulgel NS" (the above are (hydroxyethyl acrylate / sodium acryloyldimethyltaurine) copolymers), "Sepimax zen" (polyacrylate crosspolymer-6), "Aristoflex AVC" ((ammonium acryloyldimethyltaurine / VP) copolymer) manufactured by Clariant Japan Co., Ltd., "Aristoflex HMB" ((ammonium acryloyldimethyltaurine / beheneth-25 methacrylate) crosspolymer), "Carbopol 981" (carboxyvinyl polymer) manufactured by Lubrizol Advanced Materials, etc.

[0031] <Component (B): Cationic polymer> (B) The cationic polymer is a polymer that can form a polyion complex by interaction with the (A) anionic polymer. A film containing a polyion complex has a crosslinked structure and is hydrophobic, so it is considered possible to form a film with high water resistance and abrasion resistance. The cationic polymer as the component (B) is preferably a polymer having a cationic group and positively charged as the total charge. The component (B) may have an anionic group, a nonionic group, or an amphoteric group such as a betaine group in addition to the cationic group as long as the effects of the present invention are not inhibited. In this specification, the cationic group is a cation group or a group that can be ionized to become a cation group, and specifically includes a primary amino group, a secondary amino group, a tertiary amino group, and a quaternary ammonium group.

[0032] From the viewpoints of film formation, improvement of water vapor barrier properties in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, component (B) preferably contains at least one selected from the group consisting of (B1) a cationic polymer containing a structural unit represented by the following general formula (2), and (B2) a cationized polysaccharide.

Chemical formula

[0033] (Component (B1): Cationic polymer containing a structural unit represented by general formula (2)) Component (B1) is a cationic polymer containing the structural unit represented by the general formula (2). R 11 in the general formula (2) is preferably a methyl group, and R 12 ~R 14 are each independently preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group or an ethyl group, and even more preferably a methyl group. X in the general formula (2) is preferably -O-, and m is preferably from 1 to 3, more preferably from 2 to 3.

[0034] Examples of the structural unit represented by the general formula (2) include at least one selected from the group consisting of a structural unit derived from methacryloylethyltrimethylammonium salt, a structural unit derived from diethyl sulfate of N,N-dimethylaminoethyl methacrylate, and a structural unit derived from methacrylamidopropyltrimethylammonium salt. Preferably, it contains at least one selected from the group consisting of a structural unit derived from methacryloylethyltrimethylammonium salt and a structural unit derived from diethyl sulfate of N,N-dimethylaminoethyl methacrylate.

[0035] In component (B1), from the viewpoints of film-forming properties, improvement of water vapor barrier properties in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, the content of the structural unit represented by the general formula (2) is preferably 8.0 mol% or more and 100 mol% or less in all the structural units constituting component (B1).

[0036] Component (B1) may be a polymer containing other structural units in addition to the structural unit represented by the general formula (2). Examples of the other structural units include structural units derived from vinyl monomers such as vinyl pyrrolidone, amphoteric monomers such as (meth)acryloyl ethyl dimethyl betaine, alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, acrylamides such as N,N-dimethylacrylamide, and the like. Component (B1) may also be a cross-polymer cross-linked with polyethylene glycol di(meth)acrylate or the like.

[0037] Preferable specific examples of the cationic polymer containing the structural unit represented by the general formula (2) include methacryloyl ethyl trimethyl ammonium chloride polymer (polyquaternium-37), methacryloyl ethyl dimethyl betaine·methacryloyl ethyl trimethyl ammonium chloride·methacrylic acid methoxypolyethylene glycol copolymer (polyquaternium-49), methacryloyl ethyl dimethyl betaine·methacryloyl ethyl trimethyl ammonium chloride·2-hydroxyethyl methacrylate copolymer (polyquaternium-48), and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·polyethylene glycol dimethacrylate copolymer (polyquaternium-52). One or more selected from the group consisting of these are included. Among these, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, preferably, it contains at least one selected from the group consisting of methacryloyl ethyl trimethyl ammonium chloride polymer (polyquaternium-37) and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide· polyethylene glycol dimethacrylate copolymer (polyquaternium-52).

[0038] As the component (B1), a commercially available polymer can also be used. Specific examples thereof include "Soft Care KG-101W-E" (polyquaternium-52), "Soft Care KG-301W" (polyquaternium-52), "Polymer KG30" (polyquaternium-52), "KP Polymer E" (polyquaternium-37) manufactured by Kao Corporation, and "Cosmedia Ultragel 300" (polyquaternium-37) manufactured by BASF Japan Ltd., etc.

[0039] (Component (B2): Cationized polysaccharide) The component (B2) is a cationized polysaccharide. In the present specification, the "cationized polysaccharide" refers to a modified polysaccharide in which a cationic group is introduced into the polymer skeleton of the polysaccharide. Specific examples of the cationized polysaccharide include cationized galactomannans such as cationized guar gum, cationized tara gum, cationized fenugreek gum, cationized locust bean gum; cationized polymers having a cellulose skeleton such as cationized cellulose, cationized hydroxyethyl cellulose, cationized hydroxypropyl cellulose, cationized carboxymethyl cellulose; cationized starch; etc. Among these, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, the cationized polysaccharide is preferably at least one selected from the group consisting of cationized galactomannan and cationized polymers having a cellulose skeleton, more preferably a cationized polymer having a cellulose skeleton, still more preferably cationized hydroxyethyl cellulose, and even more preferably contains hydroxyethyl cellulose hydroxypropyltrimethylammonium chloride ether (polyquaternium-10).

[0040] As the component (B2), commercially available polymers can also be used. Specific examples thereof include cationized guar gums of the "Jaguar C" series manufactured by Solvay and the "Laboll Gum" series manufactured by DSP Gohsei Hood & Chemical Co., Ltd.; cationized celluloses of the "Pois C" series manufactured by Kao Corporation and the "Katinar" series manufactured by Toho Chemical Industry Co., Ltd., and the like.

[0041] From the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, the component (B) preferably contains at least one selected from the group consisting of methacryloyl ethyl trimethylammonium chloride polymer (polyquaternium-37), N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·diacrylic acid polyethylene glycol copolymer (polyquaternium-52), and hydroxyethyl cellulose hydroxypropyltrimethylammonium chloride ether (polyquaternium-10).

[0042] <Component (C): Water-swellable clay mineral and water-swellable mica> The component (C) is at least one selected from the group consisting of water-swellable clay minerals and water-swellable mica. The water-swellability referred to here means the property of swelling when dispersed in water. More specifically, it means those having a water swelling degree of 40 mL / 2 g or more determined by the following test method. (Test method) Put 100 mL of ion-exchanged water into a 100 mL graduated cylinder. Add 2 g of component (B) little by little in several portions so as not to stick to the wall of the graduated cylinder. After all of component (C) has naturally settled to the bottom of the graduated cylinder, read the volume (mL) of component (C) after 24 hours from the scale. The average value of three tests is taken as the water swelling degree (mL / 2 g) of component (C).

[0043] The water swelling degree of component (C) is 40 mL / 2 g or more, preferably 42 mL / 2 g or more, more preferably 45 mL / 2 g or more, still more preferably 50 mL / 2 g or more, from the viewpoints of suppressing aggregation of component (C), improving water vapor barrier properties in a low humidity environment, and improving environmental responsiveness. The upper limit is not particularly limited, but is usually 90 mL / 2 g or less, preferably 80 mL / 2 g or less, more preferably 75 mL / 2 g or less. And the water swelling degree of component (C) is preferably 40 mL / 2 g or more and 90 mL / 2 g or less, more preferably 42 mL / 2 g or more and 90 mL / 2 g or less, still more preferably 45 mL / 2 g or more and 80 mL / 2 g or less, even more preferably 50 mL / 2 g or more and 75 mL / 2 g or less.

[0044] The aspect ratio of component (C) is preferably 40 or more, more preferably 70 or more, still more preferably 100 or more, even more preferably 150 or more, even more preferably 160 or more, even more preferably 180 or more, and even more preferably 190 or more, from the viewpoints of improving the water vapor barrier property in a low humidity environment and improving the environmental responsiveness. The upper limit is not particularly limited, but is usually 2000 or less, preferably 1000 or less, more preferably 600 or less, still more preferably 500 or less, and even more preferably 400 or less. And the aspect ratio of component (C) is preferably 40 or more and 2000 or less, more preferably 70 or more and 2000 or less, still more preferably 100 or more and 2000 or less, even more preferably 150 or more and 2000 or less, even more preferably 150 or more and 2000 or less, even more preferably 150 or more and 1000 or less, even more preferably 160 or more and 600 or less, even more preferably 180 or more and 500 or less, and even more preferably 190 or more and 400 or less. The aspect ratio of component (C) can be measured according to the method described in Clay Science, Vol. 50, No. 3, 162 - 174 (2012), specifically, by the method described in the examples.

[0045] The average particle size of component (C) is preferably 100 nm or more, more preferably 200 nm or more, still more preferably 300 nm or more, from the viewpoints of film formability, improving the water vapor barrier property in a low humidity environment, and improving the environmental responsiveness. Also, it is preferably 2000 nm or less, more preferably 1500 nm or less, and still more preferably 1000 nm or less. And the average particle size of component (C) is preferably 100 nm or more and 2000 nm or less, more preferably 200 nm or more and 1500 nm or less, and still more preferably 300 nm or more and 1000 nm or less. The average particle size of component (C) can be measured by dynamic light scattering (DLS).

[0046] Component (C) is one or more selected from the group consisting of water - swellable clay minerals and mica. Hereinafter, clay minerals and mica may be collectively referred to as "minerals". The above - mentioned water - swellable clay mineral has cations (Na+ 、 K + 、 Mg 2+ 、 Ca 2+ etc.) and swells by absorbing water. Specifically, smectite, bentonite, montmorillonite, beidellite, nontronite, saponite, stevensite, hectorite, etc. can be mentioned, and one or more of these can be used. Water-swellable mica has cations (Na + 、 K + 、 Mg 2+ 、 Ca 2+ etc.) between its layers among micas and swells by absorbing water. Specifically, sodium tetrasilicate mica, etc. can be mentioned.

[0047] Component (C) may be a mineral subjected to surface treatment, but from the viewpoint of water-swellability, it is preferably a mineral that has not been subjected to surface treatment or has been subjected to hydrophilic treatment, and more preferably a mineral that has not been subjected to surface treatment.

[0048] From the viewpoints of improving the water vapor barrier property in a low humidity environment and improving the environmental responsiveness, component (C) is preferably at least one selected from the group consisting of water-swellable bentonite, water-swellable montmorillonite, and water-swellable mica, and more preferably includes at least one selected from the group consisting of water-swellable bentonite, water-swellable montmorillonite, and sodium tetrasilicate mica.

[0049] Commercially available products can also be used as component (C). Specific examples thereof include "Kunipia G4", "Kunipia F" (both are purified bentonite (montmorillonite)) manufactured by Kunimine Industries Co., Ltd., "Bengel HV", "Bengel Next Nc" (both are bentonite) manufactured by Hoojun Co., Ltd., "NTS-5" (sodium tetrasilicate mica) manufactured by Toppan Industries Co., Ltd., etc.

[0050] <Component (D): Glycerin or its condensate> From the viewpoints of improving blending stability, improving water vapor barrier properties in a low humidity environment, and improving environmental responsiveness, the aqueous composition can further contain glycerin or its condensate as component (D). Examples of the glycerin or its condensate include glycerin, diglycerin, polyglycerin, etc., and one or more of these can be used. Among the above, the glycerin or its condensate is preferably one or more selected from the group consisting of glycerin and diglycerin, and more preferably glycerin.

[0051] <Water> Since the composition obtained by the production method of the present invention is an aqueous composition, it contains water. As the water, deionized water or distilled water is preferred. In addition, tap water, groundwater, etc. sterilized with hypochlorous acid or the like may be used as long as the stability of the composition is not impaired.

[0052] In addition, the aqueous composition can contain, as optional components, nonionic polymers, aqueous media other than water and component (D), surfactants, pH adjusters, oils, feel improvers, colorants, antioxidants, anti-dandruff agents, vitamin agents, bactericides, anti-inflammatory agents, preservatives, chelating agents, humectants, pearl agents, ceramides, plant extracts, ultraviolet absorbers, etc.

[0053] <Content> From the viewpoints of film-forming properties and improvement of environmental responsiveness, the content of component (A) in the aqueous composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, and even more preferably 1.2% by mass or more. Also, from the viewpoints of improvement of water vapor barrier properties in a low-humidity environment and improvement of coatability, it is preferably 10% by mass or less, more preferably 8.0% by mass or less, still more preferably 5.0% by mass or less, and even more preferably 3.0% by mass or less. And the content of component (A) in the aqueous composition is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.2% by mass or more and 10% by mass or less, still more preferably 0.3% by mass or more and 8.0% by mass or less, even more preferably 0.5% by mass or more and 8.0% by mass or less, even more preferably 1.0% by mass or more and 5.0% by mass or less, and even more preferably 1.2% by mass or more and 3.0% by mass or less.

[0054] From the viewpoint of improving the water resistance of the formed film, the content of component (B) in the aqueous composition is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. Also, from the viewpoint of improving blending stability, it is preferably 10% by mass or less, more preferably 8.0% by mass or less, still more preferably 5.0% by mass or less, even more preferably 2.0% by mass or less, even more preferably 1.0% by mass or less, and even more preferably 0.5% by mass or less. And the content of component (B) in the aqueous composition is preferably 0.02% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8.0% by mass or less, still more preferably 0.1% by mass or more and 5.0% by mass or less, even more preferably 0.2% by mass or more and 2.0% by mass or less, even more preferably 0.2% by mass or more and 1.0% by mass or less, and even more preferably 0.2% by mass or more and 0.5% by mass or less.

[0055] From the perspective of improving the water vapor barrier property in a low humidity environment, the content of component (C) in the aqueous composition is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more. Also, from the perspectives of film-forming property, improving environmental responsiveness, and improving the dispersibility of component (C), it is preferably 10% by mass or less, more preferably 8.0% by mass or less, still more preferably 5.0% by mass or less, even more preferably 3.0% by mass or less, and even more preferably 2.0% by mass or less. And the content of component (C) in the aqueous composition is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8.0% by mass or less, still more preferably 0.1% by mass or more and 5.0% by mass or less, even more preferably 0.1% by mass or more and 3.0% by mass or less, and even more preferably 0.2% by mass or more and 2.0% by mass or less.

[0056] When the aqueous composition contains component (D), from the perspectives of improving blending stability, improving the water vapor barrier property in a low humidity environment, and improving environmental responsiveness, the content of component (D) in the aqueous composition is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, still more preferably 0.5% by mass or more, and even more preferably 1.0% by mass or more. Also, from the perspective of improving blending stability, it is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, and even more preferably 5.0% by mass or less. And the content of component (D) in the aqueous composition is preferably 0.05% by mass or more and 20% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, still more preferably 0.5% by mass or more and 10% by mass or less, and even more preferably 1.0% by mass or more and 5.0% by mass or less.

[0057] From the perspective of improving blending stability, the water content of the aqueous composition is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, and even more preferably 85% by mass or more. Note that the water content in the aqueous composition may be the balance of components (A) to (C), or the balance of components (A) to (D).

[0058] From the viewpoints of film formability, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, the total content of component (A) and component (B) in the aqueous composition is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, even more preferably 1.2% by mass or more, and even more preferably 1.5% by mass or more. Also, from the viewpoint of improving blending stability, it is preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 5.0% by mass or less, and even more preferably 3.5% by mass or less. And the total content of component (A) and component (B) in the aqueous composition is preferably 0.1% by mass or more and 15% by mass or less, more preferably 0.2% by mass or more and 10% by mass or less, still more preferably 0.3% by mass or more and 5.0% by mass or less, even more preferably 0.5% by mass or more and 5.0% by mass or less, even more preferably 1.0% by mass or more and 5.0% by mass or less, even more preferably 1.2% by mass or more and 5.0% by mass or less, and even more preferably 1.5% by mass or more and 4.0% by mass or less.

[0059] From the viewpoints of improving water vapor barrier property in a low humidity environment, improving environmental responsiveness, and improving water resistance of the formed film, the mass ratio [(A) / (B)] of component (A) to component (B) in the aqueous composition is preferably 1.0 or more, more preferably 2.0 or more, still more preferably 3.0 or more, even more preferably 4.0 or more, even more preferably 5.0 or more, and even more preferably 5.5 or more. Also, it is preferably 30 or less, more preferably 20 or less, still more preferably 15 or less, even more preferably 12 or less, and even more preferably 10 or less. And the mass ratio [(A) / (B)] of component (A) to component (B) in the aqueous composition is preferably 1.0 or more and 30 or less, more preferably 2.0 or more and 20 or less, still more preferably 3.0 or more and 15 or less, even more preferably 4.0 or more and 12 or less, even more preferably 5.0 or more and 10 or less, and even more preferably 5.5 or more and 10 or less.

[0060] From the viewpoints of film formability, improvement of water vapor barrier property in a low humidity environment, improvement of environmental responsiveness, and improvement of water resistance of the formed film, the total content of components (A) to (C) in the aqueous composition is preferably 0.11% by mass or more, more preferably 0.2% by mass or more, still more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 1.0% by mass or more, even more preferably 1.2% by mass or more, even more preferably 1.5% by mass or more, and even more preferably 2.0% by mass or more. Further, from the viewpoint of improving blending stability, it is preferably 25% by mass or less, more preferably 20% by mass or less, still more preferably 15% by mass or less, even more preferably 10% by mass or less, even more preferably 8.0% by mass or less, even more preferably 5.0% by mass or less, and even more preferably 4.0% by mass or less. And the total content of components (A) to (C) in the aqueous composition is preferably 0.11% by mass or more and 25% by mass or less, more preferably 0.2% by mass or more and 20% by mass or less, still more preferably 0.3% by mass or more and 15% by mass or less, even more preferably 0.5% by mass or more and 10% by mass or less, even more preferably 1.0% by mass or more and 8.0% by mass or less, even more preferably 1.2% by mass or more and 5.0% by mass or less, even more preferably 1.5% by mass or more and 4.0% by mass or less, and even more preferably 2.0% by mass or more and 4.0% by mass or less.

[0061] The mass ratio of the total amount of component (A) and component (B) to component (C) in the aqueous composition [{(A)+(B)} / (C)] is preferably 0.2 or more, more preferably 0.3 or more, still more preferably 0.5 or more, even more preferably 0.8 or more, even more preferably 1.0 or more, even more preferably 1.5 or more, even more preferably 1.8 or more, from the viewpoints of film-forming property and improvement of blending stability. Further, from the viewpoints of improvement of water vapor barrier property in a low humidity environment and improvement of environmental responsiveness, it is preferably 20 or less, more preferably 18 or less, still more preferably 15 or less, even more preferably 12 or less, even more preferably 10 or less, even more preferably 8.0 or less, even more preferably 5.0 or less, even more preferably 3.5 or less. And the mass ratio of the total amount of component (A) and component (B) to component (C) in the aqueous composition [{(A)+(B)} / (C)] is preferably 0.2 or more and 20 or less, more preferably 0.3 or more and 20 or less, still more preferably 0.5 or more and 18 or less, even more preferably 0.8 or more and 18 or less, even more preferably 1.0 or more and 15 or less, even more preferably 1.5 or more and 10 or less, even more preferably 1.5 or more and 8.0 or less, even more preferably 1.8 or more and 5.0 or less, even more preferably 1.8 or more and 3.5 or less.

[0062] <Form of the composition> The aqueous composition for the body obtained by the production method of the present invention is an aqueous composition, and preferably contains 50% by mass or more of water. The aqueous composition may be in the form of an emulsion composition. From the viewpoints of being an aqueous composition and improvement of the feeling of use, the emulsion composition is preferably an oil-in-water type emulsion composition.

[0063] <Storage elastic modulus> From the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness, the storage elastic modulus measured by dynamic viscoelasticity measurement under the conditions of a temperature of 25°C, a frequency of 2 Hz, and a strain of 0.01% of the aqueous composition is preferably 60 Pa or more and 5,000 Pa or less. When the storage elastic modulus of the composition is within the above range, it is considered that defects are less likely to occur in the maze structure in the formed film, and the water vapor barrier property can be enhanced. The storage elastic modulus of the aqueous composition is more preferably 80 Pa or more, still more preferably 100 Pa or more, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of environmental responsiveness. Further, from the viewpoints of film-forming property, improvement of water vapor barrier property in a low humidity environment, and improvement of coatability, it is more preferably 4,000 Pa or less, still more preferably 3,500 Pa or less, even more preferably 3,000 Pa or less. And the storage elastic modulus of the aqueous composition measured under the conditions of a temperature of 25°C, a frequency of 2 Hz, and a strain of 0.01% by dynamic viscoelasticity measurement is preferably 60 Pa or more and 5,000 Pa or less, more preferably 80 Pa or more and 4,000 Pa or less, still more preferably 100 Pa or more and 3,500 Pa or less, even more preferably 100 Pa or more and 3,000 Pa or less. Specifically, the above storage elastic modulus can be measured by the method described in the examples.

[0064] Next, each step of the method for producing the aqueous composition for the body will be described. <Step 1: Preparation of Mixture 1> In Step 1, a mixture 1 containing at least one selected from the group consisting of an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2 mass% aqueous solution, (C) a water-swellable clay mineral, and water-swellable mica, and water is prepared.

[0065] In the preparation of mixture 1, the mixing method of component (A), component (C), and water is not particularly limited. For example, (1) a method of simultaneously adding component (A) and component (C) to water and mixing them, (2) a method of preparing an aqueous solution of component (A) and an aqueous dispersion of component (C) respectively and mixing them, (3) a method of mixing an aqueous solution of component (A) and component (C), (4) a method of mixing component (A) and an aqueous dispersion of component (C), etc. can be mentioned. Among the above, from the viewpoint of ease of production, the method of mixing (3) an aqueous solution of component (A) and an aqueous dispersion of component (C) is preferred.

[0066] When the aqueous composition contains component (D), it is preferable to mix component (D) in Step 1. Further, for example, in the above (2) or (3), when preparing an aqueous solution of component (A), component (A) may be dispersed in an aqueous medium other than water, such as (D) glycerin or its condensate, in advance and then dissolved in water.

[0067] In the above (2) or (3), the concentration of component (A) in the aqueous solution of component (A) is not particularly limited. However, from the viewpoint of improving the freedom of formulation, it is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more. From the viewpoint of handleability, it is preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 5.0% by mass or less. As the aqueous solution of component (A), a commercially available aqueous solution can also be used. Further, for example, the reaction solution when component (A) is produced using water as the reaction solvent may be used as the aqueous solution of component (A).

[0068] In the above (2) or (4), the concentration of component (C) in the aqueous dispersion of component (C) is not particularly limited. However, from the viewpoint of improving the freedom of formulation, it is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more. From the viewpoint of improving the blending stability, it is preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, even more preferably 8.0% by mass or less. As the aqueous dispersion of component (C), a commercially available product may be used.

[0069] In the above (2) to (4), the water used for the aqueous solution of component (A) and the aqueous dispersion of component (C) may be at least a part of the water blended in the aqueous composition. Further, in Step 1, in order to adjust the obtained mixture 1 to a desired concentration, water can be further added.

[0070] The total content of component (A) and component (C) in mixture 1 is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, and preferably 20% by mass or less, more preferably 10% by mass or less, still more preferably 7.0% by mass or less, even more preferably 5.0% by mass or less, from the viewpoints of improving the stability of the aqueous composition and ease of production.

[0071] In the preparation of mixture 1 in step 1, optional components other than component (A) and component (C) can be appropriately blended. However, the total content of component (A), (C) and water in mixture 1 is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass or less.

[0072] The preparation of mixture 1 in step 1 can be carried out using a known stirring device such as a homomixer, a disperser, a mechanical stirrer, etc.

[0073] In step 1, the mixing temperature during the preparation of mixture 1 is not particularly limited. However, from the viewpoint of improving the solubility or dispersibility of component (A) and component (C), it is preferably 0°C or more, more preferably 5°C or more, still more preferably 10°C or more, and from the viewpoint of suppressing thermal degradation of the blended components, it is preferably 90°C or less, more preferably 80°C or less, still more preferably 70°C or less, even more preferably 65°C or less.

[0074] The mixing time during the preparation of mixture 1 can be appropriately selected, but it is preferably 1 minute or more, more preferably 3 minutes or more, and preferably 6 hours or less from the viewpoint of productivity.

[0075] <Step 2> In step 2, the above-mentioned mixture 1 is mixed with (B) a cationic polymer to obtain an aqueous composition for the body. In Step 2, the (B) cationic polymer may be directly mixed with the above mixture 1, but from the viewpoint of ease of production, it is preferable to mix the mixture 1 with an aqueous solution of component (B). The concentration of component (B) in the aqueous solution of component (B) is not particularly limited, but from the viewpoint of improving the degree of freedom in formulation, it is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and from the viewpoint of handleability, it is preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 5.0% by mass or less. As the aqueous solution of component (B), a commercially available aqueous solution can also be used. Further, for example, the reaction solution when component (B) is produced using water as a reaction solvent may be used as the aqueous solution of component (B).

[0076] In Step 2, in order to adjust the obtained aqueous composition to a desired concentration, the remaining water can be further added.

[0077] When the aqueous composition for the body is in the form of an emulsion composition further containing an oil agent or the like, the oil agent can be mixed at any stage. However, from the viewpoint of improving the formulation stability, it is preferable to add and mix the oil agent after Step 2. The mixing conditions (apparatus used, mixing temperature, mixing time) in Step 2 are the same as those in Step 1.

[0078] The aqueous composition obtained by the production method of the present invention has film-forming properties and can preferably be used as a cosmetic composition or its premix. By applying the cosmetic composition containing the aqueous composition to an object to be treated, a film can be formed that exhibits water vapor barrier properties in a low-humidity environment and water vapor release properties in a high-humidity environment. The content of the aqueous composition in the cosmetic composition is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, even more preferably 90% by mass or more, and 100% by mass or less.

[0079] Examples of the types of cosmetic compositions include skin cosmetic compositions, hair cosmetic compositions, etc., and preferably skin cosmetic compositions. Further, from the viewpoint of the effectiveness of the effect of the present invention of having film-forming properties, the cosmetic composition is preferably a leave-on type cosmetic composition that is used without being washed away after being applied to the object to be treated. Among the cosmetic compositions, examples of the product forms of skin cosmetic compositions include makeup cosmetics, sunscreen agents, makeup bases, emulsions, beauty essences, creams, etc. Examples of the product forms of hair cosmetic compositions include hair shampoos, hair rinses, hair conditioners, hair treatments (including those not to be washed away), hair styling agents, hair colors, permanent agents, etc. Among these, from the viewpoint of the effectiveness of the effect of the present invention of having film-forming properties, the hair cosmetic composition is preferably a hair conditioner, a hair treatment, or a hair styling agent.

[0080] Regarding the above-described embodiments, the present invention further discloses the following. <1> A method for producing an aqueous composition for the body, comprising: the composition contains (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) a cationic polymer, (C) one or more selected from the group consisting of water-swellable clay minerals and water-swellable mica, and water; A method for producing an aqueous composition for the body, having the following steps 1 and 2 in sequence. Step 1: A step of preparing a mixture 1 containing (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (C) one or more selected from the group consisting of water-swellable clay minerals and water-swellable mica, and water; Step 2: A step of mixing the mixture 1 and (B) a cationic polymer. <2> The method for producing the aqueous composition for the body of <1>, wherein the anionic group in the component (A) is at least one selected from the group consisting of acidic groups such as a carboxy group, a sulfonic acid group, a sulfuric acid group, and a phosphoric acid group, preferably at least one selected from a carboxy group, a sulfonic acid group, and a sulfuric acid group, more preferably a sulfonic acid group or a sulfuric acid group. <3> The method for producing the aqueous composition for the body of <1> or <2>, wherein the viscosity at 25 °C of a 2% by mass aqueous solution of the component (A) is preferably 1,500 mPa·s or more and 200,000 mPa·s or less, more preferably 3,000 mPa·s or more and 200,000 mPa·s or less, still more preferably 5,000 mPa·s or more and 200,000 mPa·s or less, even more preferably 10,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 30,000 mPa·s or more and 150,000 mPa·s or less, even more preferably 50,000 mPa·s or more and 100,000 mPa·s or less, even more preferably 70,000 mPa·s or more and 100,000 mPa·s or less. <4> The method for producing the aqueous composition for the body of any one of <1> to <3>, wherein the component (A) contains at least one selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfuric acid group, (A2) an anionic polymer having a structural unit represented by the following general formula (1), and (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid.

Chemical formula

[0081] <11> The method for producing a body aqueous composition according to any one of <1> to <10>, wherein the component (B) preferably contains at least one selected from the group consisting of (B1) a cationic polymer containing a structural unit represented by the following general formula (2), and (B2) a cationized polysaccharide. [Chemical formula] In formula (2), R 11 is a hydrogen atom or a methyl group, and R 12 ~R 14 are each independently an alkyl group having 1 to 4 carbon atoms. X is -O- or -NH-, and m is a number from 1 to 4. <12> Examples of the structural unit represented by the general formula (2) include at least one selected from the group consisting of a structural unit derived from methacryloylethyltrimethylammonium salt, a structural unit derived from diethyl sulfate N,N-dimethylaminoethyl methacrylate, and a structural unit derived from methacrylamidopropyltrimethylammonium salt. Preferably, it contains at least one selected from the group consisting of a structural unit derived from methacryloylethyltrimethylammonium salt and a structural unit derived from diethyl sulfate N,N-dimethylaminoethyl methacrylate. The method for producing a body aqueous composition according to <11>. <13> The component (B1) is at least one selected from the group consisting of methacryloyloxyethyltrimethylammonium chloride polymer (polyquaternium-37), methacryloyloxyethyldimethylbetaine·methacryloyloxyethyltrimethylammonium chloride·methacrylic acid methoxypolyethylene glycol copolymer (polyquaternium-49), methacryloyloxyethyldimethylbetaine·methacryloyloxyethyltrimethylammonium chloride·2-hydroxyethyl methacrylate copolymer (polyquaternium-48), and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·dimethacrylic acid polyethylene glycol copolymer (polyquaternium-52), preferably at least one selected from the group consisting of methacryloyloxyethyltrimethylammonium chloride polymer (polyquaternium-37) and N,N-dimethylaminoethyl methacrylate diethyl sulfate·N,N-dimethylacrylamide·dimethacrylic acid polyethylene glycol copolymer (polyquaternium-52), and is a method for producing a body aqueous composition of <11> or <12>. <14> The component (B2) is at least one selected from the group consisting of cationized galactomannan, a cationized polymer having a cellulose skeleton, and cationized starch, preferably at least one selected from the group consisting of cationized galactomannan and a cationized polymer having a cellulose skeleton, more preferably a cationized polymer having a cellulose skeleton, still more preferably cationized hydroxyethyl cellulose, and even more preferably hydroxyethyl cellulose hydroxypropyltrimethylammonium chloride ether (polyquaternium-10), and is a method for producing a body aqueous composition of any one of <11> to <13>. <15> The method for producing a body aqueous composition according to any one of <1> to <14>, wherein the component (B) preferably contains at least one selected from the group consisting of methacryloyl ethyl trimethyl ammonium chloride polymer (polyquaternium-37), diethyl sulfate dimethylaminoethyl methacrylate·N,N-dimethylacrylamide· polyethylene glycol dimethacrylate copolymer (polyquaternium-52), and hydroxyethyl cellulose hydroxypropyl trimethyl ammonium chloride ether (polyquaternium-10). <16> The method for producing a body aqueous composition according to any one of <1> to <15>, wherein the water swelling degree of the component (C) determined by the following test method is 40 mL / 2 g or more. (Test method) Put 100 mL of ion-exchanged water into a 100 mL graduated cylinder. Add 2 g of the component (B) little by little in several portions so as not to stick to the wall surface of the graduated cylinder. After all of the component (C) has naturally settled to the bottom of the graduated cylinder, read the volume (mL) of the component (C) after 24 hours from the scale. The average value of three tests is taken as the water swelling degree (mL / 2 g) of the component (C). <17> The method for producing a body aqueous composition according to <16>, wherein the water swelling degree of the component (C) is preferably 40 mL / 2 g or more and 90 mL / 2 g or less, more preferably 42 mL / 2 g or more and 90 mL / 2 g or less, still more preferably 45 mL / 2 g or more and 80 mL / 2 g or less, and even more preferably 50 mL / 2 g or more and 75 mL / 2 g or less. <18> The method for producing a body aqueous composition according to any one of <1> to <17>, wherein the aspect ratio of the component (C) is preferably 40 or more and 2000 or less, more preferably 70 or more and 2000 or less, still more preferably 100 or more and 2000 or less, even more preferably 150 or more and 2000 or less, even more preferably 150 or more and 2000 or less, even more preferably 150 or more and 1000 or less, even more preferably 160 or more and 600 or less, even more preferably 180 or more and 500 or less, and even more preferably 190 or more and 400 or less. <19> The average particle diameter of the component (C) is preferably 100 nm or more and 2000 nm or less, more preferably 200 nm or more and 1500 nm or less, still more preferably 300 nm or more and 1000 nm or less. A method for producing a body aqueous composition according to any one of <1> to <18>. <20> The component (C) is preferably at least one selected from the group consisting of water-swellable bentonite, water-swellable montmorillonite, and water-swellable mica, and more preferably contains at least one selected from the group consisting of water-swellable bentonite, water-swellable montmorillonite, and sodium tetrasilicate mica. A method for producing a body aqueous composition according to any one of <1> to <19>.

[0082] <21> Furthermore, as the component (D), a method for producing a body aqueous composition according to any one of <1> to <20>, which contains glycerin or a condensate thereof. <22> The content of the component (A) in the body aqueous composition is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.2% by mass or more and 10% by mass or less, still more preferably 0.3% by mass or more and 8.0% by mass or less, even more preferably 0.5% by mass or more and 8.0% by mass or less, even more preferably 1.0% by mass or more and 5.0% by mass or less, even more preferably 1.2% by mass or more and 3.0% by mass or less. A method for producing a body aqueous composition according to any one of <1> to <21>. <23> The content of the component (B) in the body aqueous composition is preferably 0.02% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8.0% by mass or less, still more preferably 0.1% by mass or more and 5.0% by mass or less, even more preferably 0.2% by mass or more and 2.0% by mass or less, even more preferably 0.2% by mass or more and 1.0% by mass or less, even more preferably 0.2% by mass or more and 0.5% by mass or less. A method for producing a body aqueous composition according to any one of <1> to <22>. <24> The content of component (C) in the aqueous composition for the body is preferably 0.01% by mass or more and 10% by mass or less, more preferably 0.05% by mass or more and 8.0% by mass or less, still more preferably 0.1% by mass or more and 5.0% by mass or less, even more preferably 0.1% by mass or more and 3.0% by mass or less, and even more preferably 0.2% by mass or more and 2.0% by mass or less. A method for producing any one of the aqueous compositions for the body of <1> to <23>. <25> The content of component (D) in the aqueous composition for the body is preferably 0.05% by mass or more and 20% by mass or less, more preferably 0.1% by mass or more and 15% by mass or less, still more preferably 0.5% by mass or more and 10% by mass or less, and even more preferably 1.0% by mass or more and 5.0% by mass or less. A method for producing any one of the aqueous compositions for the body of <21> to <24>. <26> The water content of the aqueous composition for the body is preferably 50% by mass or more, more preferably 70% by mass or more, still more preferably 80% by mass or more, and even more preferably 85% by mass or more. A method for producing any one of the aqueous compositions for the body of <1> to <25>. <27> The total content of component (A) and component (B) in the aqueous composition for the body is preferably 0.1% by mass or more and 15% by mass or less, more preferably 0.2% by mass or more and 10% by mass or less, still more preferably 0.3% by mass or more and 5.0% by mass or less, even more preferably 0.5% by mass or more and 5.0% by mass or less, even more preferably 1.0% by mass or more and 5.0% by mass or less, even more preferably 1.2% by mass or more and 5.0% by mass or less, and even more preferably 1.5% by mass or more and 4.0% by mass or less. A method for producing any one of the aqueous compositions for the body of <1> to <26>. <28> The mass ratio [(A) / (B)] of component (A) to component (B) in the aqueous composition for the body is preferably 1.0 or more and 30 or less, more preferably 2.0 or more and 20 or less, still more preferably 3.0 or more and 15 or less, even more preferably 4.0 or more and 12 or less, even more preferably 5.0 or more and 10 or less, and even more preferably 5.5 or more and 10 or less. A method for producing any one of the aqueous compositions for the body of <1> to <27>. <29> The total content of components (A) to (C) in the aqueous composition for the body is preferably 0.11% by mass or more and 25% by mass or less, more preferably 0.2% by mass or more and 20% by mass or less, still more preferably 0.3% by mass or more and 15% by mass or less, even more preferably 0.5% by mass or more and 10% by mass or less, even more preferably 1.0% by mass or more and 8.0% by mass or less, even more preferably 1.2% by mass or more and 5.0% by mass or less, even more preferably 1.5% by mass or more and 4.0% by mass or less, even more preferably 2.0% by mass or more and 4.0% by mass or less. A method for producing an aqueous composition for the body according to any one of <1> to <28>. <30> The mass ratio [{(A)+(B)} / (C)] of the total amount of components (A) and (B) to component (C) in the aqueous composition for the body is preferably 0.2 or more and 20 or less, more preferably 0.3 or more and 20 or less, still more preferably 0.5 or more and 18 or less, even more preferably 0.8 or more and 18 or less, even more preferably 1.0 or more and 15 or less, even more preferably 1.5 or more and 10 or less, even more preferably 1.5 or more and 8.0 or less, even more preferably 1.8 or more and 5.0 or less, even more preferably 1.8 or more and 3.5 or less. A method for producing an aqueous composition for the body according to any one of <1> to <29>.

[0083] <31> The storage elastic modulus of the aqueous composition for the body measured under the conditions of a temperature of 25°C, a frequency of 2 Hz, and a strain of 0.01% by dynamic viscoelasticity measurement is preferably 60 Pa or more and 5,000 Pa or less, more preferably 80 Pa or more and 4,000 Pa or less, still more preferably 100 Pa or more and 3,500 Pa or less, even more preferably 100 Pa or more and 3,000 Pa or less. A method for producing an aqueous composition for the body according to any one of <1> to <30>. <32> In the preparation of the above mixture 1, the mixing method of component (A), component (C), and water is any one of the following: (1) a method of simultaneously adding component (A) and component (C) to water and mixing them; (2) a method of separately preparing an aqueous solution of component (A) and an aqueous dispersion of component (C) and mixing them; (3) a method of mixing an aqueous solution of component (A) and component (C); (4) a method of mixing component (A) and an aqueous dispersion of component (C). Preferably, it is the method of (3) mixing an aqueous solution of component (A) and an aqueous dispersion of component (C). A method for producing a body aqueous composition according to any one of <1> to <31>. <33> In the above (2) or (3), the concentration of component (A) in the aqueous solution of component (A) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and from the viewpoint of handleability, preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 5.0% by mass or less. A method for producing a body aqueous composition according to <32>. <34> In the above (2) or (4), the concentration of component (C) in the aqueous dispersion of component (C) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, even more preferably 2.0% by mass or more, and from the viewpoint of improving blending stability, preferably 20% by mass or less, more preferably 15% by mass or less, still more preferably 10% by mass or less, even more preferably 8.0% by mass or less. A method for producing a body aqueous composition according to <32> or <33>. <35> The total content of component (A) and component (C) in the above mixture 1 is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, still more preferably 2.0% by mass or more, even more preferably 3.0% by mass or more, and preferably 20% by mass or less, more preferably 10% by mass or less, still more preferably 7.0% by mass or less, even more preferably 5.0% by mass or less. A method for producing a body aqueous composition according to any one of <1> to <34>. <36> The total content of component (A), component (C) and water in the mixture 1 is preferably 70% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, even more preferably 95% by mass or more, and 100% by mass or less. A method for producing a body aqueous composition according to any one of <1> to <35>. <37> The mixing temperature during the preparation of the mixture 1 is preferably 0 °C or higher, more preferably 5 °C or higher, still more preferably 10 °C or higher, and preferably 90 °C or lower, more preferably 80 °C or lower, still more preferably 70 °C or lower, even more preferably 65 °C or lower. A method for producing a body aqueous composition according to any one of <1> to <36>. <38> In the step 2, the mixture 1 and an aqueous solution of component (B) are mixed. A method for producing a body aqueous composition according to any one of <1> to <37>. <39> The concentration of component (B) in the aqueous solution of component (B) is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, still more preferably 1.0% by mass or more, and from the viewpoint of handleability, preferably 15% by mass or less, more preferably 10% by mass or less, still more preferably 5.0% by mass or less. A method for producing a body aqueous composition according to <38>.

Examples

[0084] Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to the scope of the examples. The measurements and evaluations in the examples were carried out by the following methods.

[0085] (Measurement of viscosity of 2% by mass aqueous solution of anionic polymer) A 2% by mass aqueous solution of the anionic polymer used in each example was prepared, and the viscosity of the aqueous solution at 25 °C was measured by the following method. ·Less than 500 mPa·s: Measured at 10 rpm using a Brookfield viscometer "DV2T" manufactured by Eiko Seiki Co., Ltd., spindle: CPA-41Z (angle 3 deg, radius 24 mm). ·Above 500 mPa·s and less than 3,000 mPa·s: Measured at 30 rpm using the B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd. and spindle M3. ·Above 3,000 mPa·s and less than 20,000 mPa·s: Measured at 30 rpm using the B-type viscometer "TVB-10" manufactured by Toki Sangyo Co., Ltd. and spindle M4. ·Above 20,000 mPa·s and less than 30,000 mPa·s: Measured at 10 rpm using the B-type viscometer "TVB-10" and "T-stage", T-C manufactured by Toki Sangyo Co., Ltd. ·Above 30,000 mPa·s: Measured at 10 rpm using the B-type viscometer "TVB-10" and "T-stage", T-D manufactured by Toki Sangyo Co., Ltd.

[0086] (Measurement of aspect ratio of component (C)) The aspect ratio of component (C) described in the table was determined according to the method described in Clay Science, Vol. 50, No. 3, 162-174 (2012). For ion-exchanged water and aqueous dispersions of component (C) with concentrations of 0.5% by mass, 0.25% by mass, and 0.1% by mass, using a rheometer ("MCR502" manufactured by Anton Paar), at 25 °C and a shear rate of 100 s -1 the viscosity was measured. Using the viscosity of the obtained aqueous dispersion, the viscosity of water, and the volume ratio of component (B) or component (B'), the reduced viscosity of the aqueous dispersion of component (C) at each concentration was determined. A regression line was created with the value of the above reduced viscosity on the vertical axis and the volume ratio of component (C) on the horizontal axis, and the intrinsic viscosity of component (C) was determined from the intercept. The obtained intrinsic viscosity was substituted into the following Simha's equation described in Journal of Physical Chemistry, 44, 25-34 (1940) to calculate the aspect ratio of component (C). [Number] [η]: Intrinsic viscosity, f: Aspect ratio

[0087] Since the component (C) (Kunipia G4) described in the table is a natural clay mineral, the aspect ratio was measured after performing the following washing operations. The above clay mineral was washed twice with a 1M-sodium acetate aqueous solution (pH 5.0) to dissolve and remove carbonates, followed by centrifugation to remove the supernatant. Subsequently, the above clay mineral was washed three times with a 2N-NaCl aqueous solution to replace all the interlayer cations of the clay mineral with Na + ions. The supernatant was removed again by centrifugation and washed three times with a 70%-isopropyl alcohol aqueous solution. After filtration with a membrane filter (Omnipore Membrane Filters 1.0μm JA), the clay mineral cake was air-dried and ground in a mortar before being used for measurement.

[0088] (Measurement of the water swelling degree of component (C)) 100 mL of ion-exchanged water was placed in a 100 mL graduated cylinder. 2 g of component (C) was added little by little in several portions so as not to stick to the wall of the graduated cylinder. After all of component (C) had naturally settled to the bottom of the graduated cylinder, the volume X (mL / 2 g) of component (C) after 24 hours had elapsed was read from the scale. The test was conducted three times, and the average value was taken as the "water swelling degree (mL / 2 g)".

[0089] (Measurement of the storage elastic modulus G' of the composition) Dynamic viscoelasticity measurements were performed on the aqueous compositions for the body obtained in each example. Using a rheometer ("MCR502" manufactured by Anton Paar), the storage elastic modulus G' was measured at a temperature of 25°C and a measurement frequency of 2 Hz from a strain of 0.001% to 100%. The G' at a strain of 0.01%, which was a flat region in the measurement chart, was shown in the table.

[0090] (Measurement of water vapor barrier property (humidity 40%)) The aqueous composition for the body obtained in each example was applied to a filter paper (ADVANTEC, No. 1, Φ70 mm) at 1 g and dried overnight. 20 g of silica was placed as a moisture absorbent in a cup for the moisture permeability test (Φ60 mm, capacity 40 mL), and the cup was covered with the aforementioned filter paper. After measuring the initial weight of the filter paper + cup, it was placed in a thermo-hygrostat (espec "SH-262") set at a temperature of 35 °C and a humidity of 40%, and the weights of the filter paper + cup after 1 hour, 2 hours, and 3 hours were measured respectively. The value obtained by subtracting the initial weight of the filter paper + cup from the weight of the filter paper + cup at each time was taken as the moisture absorption amount (g) at each time. The slope of the linear approximation line when the moisture absorption amount was plotted on the vertical axis and the time on the horizontal axis was taken as the water vapor transmission rate W1 (g / hr) per unit time. Also, the water vapor transmission rate W0 (g / hr) was measured in the same manner using a filter paper without the application of the aqueous composition, and the reduction rate (%) of the water vapor transmission rate was determined from the following formula (1), and the average value with N = 2 was shown in the table. The larger the value of the reduction rate (%) of the water vapor transmission rate, the higher the water vapor barrier property in a low humidity environment. Reduction rate (%) of water vapor transmission rate = {1 - (W1 / W0)} × 100 (1)

[0091] (Environmental responsiveness) The reduction rate of the water vapor transmission rate was measured in the same manner under the conditions of a temperature of 35 °C and a humidity of 80%, and the value calculated from the following formula (2) was taken as the environmental responsiveness. The larger the value, the higher the humidity responsiveness, which means a good result. In this example, it is considered qualified if it is 30% or more. Environmental responsiveness (%) = (Reduction rate of water vapor transmission rate at 40% humidity) - (Reduction rate of water vapor transmission rate at 80% humidity) (2)

[0092] Examples 1 to 9 (Preparation and evaluation of aqueous composition for the body) A 3 mass% aqueous solution of component (A), a 5 mass% aqueous solution of component (B), and a 5 mass% aqueous dispersion of component (C) were prepared in advance, and each component described in Table 1 was mixed according to the following procedure. A disperser was used as the mixing device. (Step 1) While stirring a 3 mass% aqueous solution of component (A) at 60°C, the remaining amount of water was added, and then a 5 mass% aqueous dispersion of component (C) was added. In Examples 1 to 7, glycerin as component (D) was further added, and the mixture was stirred and mixed at 60°C for 2 hours to prepare Mixture 1. (Step 2) To the said Mixture 1, a 5 mass% aqueous solution of the said component (B) was added, and the mixture was stirred at room temperature (25°C) for 1 hour to prepare approximately 2000 g of the aqueous composition for the body described in Table 1. Using the obtained composition, various evaluations were carried out by the said method. The results are shown in Table 1.

[0093] Comparative Example 1 A 3 mass% aqueous solution of component (A), a 5 mass% aqueous solution of component (B), and a 5 mass% aqueous dispersion of component (C) were prepared in advance, and each component described in Table 1 was mixed according to the following procedure. A disper was used as the mixing device. (Step 1’) While stirring a 5 mass% aqueous solution of component (B), the remaining amount of water was added, and then a 5 mass% aqueous dispersion of component (C) and glycerin as component (D) were added, and the mixture was stirred and mixed at room temperature (25°C) for 1 hour to prepare Mixture 1’. (Step 2’) While stirring the said Mixture 1’ at 60°C, a 3 mass% aqueous solution of the said component (A) was added, and the mixture was stirred at 60°C for 2 hours to prepare approximately 2000 g of the aqueous composition for the body described in Table 1. Using the obtained composition, various evaluations were carried out by the said method. The results are shown in Table 1.

[0094]

Table 1

[0095] The components described in the table are as follows. Also, the compounding amounts (mass%) described in the table are the active ingredient amounts of each component. <Component (A): Anionic polymer> *1: SPS-S-SA: Manufactured by Kao Corporation, 100% active ingredient *2: Simulgel EG QD: Manufactured by SEPIC, 37.5% active ingredient *3: SEPINOV EMT10: Manufactured by SEPIC, active ingredient 89.3% *4: Sepimax zen: Manufactured by SEPIC, active ingredient 95% *5: Carbopol 981 Polymer: Manufactured by Lubrizol, active ingredient 100% <Component (B): Cationic Polymer> *6: Polymer KG30: Manufactured by Kao Corporation, active ingredient 30% *7: KP Polymer E: Manufactured by Kao Corporation, active ingredient 35% *8: Poise C-60H: Manufactured by Kao Corporation

[0096] <Component (C)> *9: Kunipia G4: Manufactured by Kunimine Industries Co., Ltd., average particle size 385 nm, aspect ratio 300, water swelling degree 73 mL / 2 g

[0097] From Table 1, it can be seen that the film formed using the aqueous composition for the body obtained by the production method of the present invention has higher water vapor barrier properties in a low humidity environment and higher environmental responsiveness as compared with Comparative Example 1.

Industrial Applicability

[0098] According to the production method of the present invention, it is possible to provide an aqueous composition for the body that can form a film that exhibits high water vapor barrier properties in a low humidity environment and water vapor release properties in a high humidity environment. The composition has film-forming properties and can be used as various cosmetic compositions.

Claims

1. A method for producing an aqueous composition for the body, comprising: the composition contains (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (B) a cationic polymer, (C) one or more selected from the group consisting of a water-swellable clay mineral and a water-swellable mica, and water, The method for producing an aqueous composition for the body has the following steps 1 and 2 in sequence. Step 1: A step of preparing a mixture 1 containing (A) an anionic polymer having a viscosity of 1,500 mPa·s or more at 25°C in a 2% by mass aqueous solution, (C) one or more selected from the group consisting of a water-swellable clay mineral and a water-swellable mica, and water Step 2: A step of mixing the mixture 1 with (B) a cationic polymer

2. The method for producing an aqueous composition for the body according to claim 1, wherein the aspect ratio of the component (C) is 40 or more.

3. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the component (A) contains one or more selected from the group consisting of (A1) an anionic polysaccharide having a sulfonic acid group or a sulfate group, (A2) an anionic polymer having a structural unit represented by the following general formula (1), and (A3) an anionic polymer other than (A2) having a structural unit derived from (meth)acrylic acid. 【Chemical 1】 In formula (1), R １ is a hydrogen atom or a methyl group, and M is a hydrogen atom, an alkali metal, or ammonium.

4. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the storage elastic modulus of the aqueous composition for the body measured by dynamic viscoelasticity measurement under the conditions of a temperature of 25°C, a frequency of 2 Hz, and a strain of 0.01% is 60 Pa or more and 5,000 Pa or less.

5. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the content of the component (A) in the aqueous composition for the body is 0.1% by mass or more and 10% by mass or less.

6. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the mass ratio [(A) / (B)] of the component (A) to the component (B) in the aqueous composition for the body is 1.0 or more and 30 or less.

7. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the mass ratio [{(A)+(B)} / (C)] of the total amount of the component (A) and the component (B) to the component (C) in the aqueous composition for the body is 0.2 or more and 20 or less.

8. The method for producing an aqueous composition for the body according to claim 1 or 2, wherein the component (B) contains one or more selected from the group consisting of (B1) a cationic polymer containing a structural unit represented by the following general formula (2), and (B2) a cationized polysaccharide. [[Chemical Formula 6]] In formula (2), R １１ is a hydrogen atom or a methyl group, and R １２ to R １４ are each independently an alkyl group having 1 to 4 carbon atoms. X is -O- or -NH-, and m is a number of 1 to 4.

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