阅读说明：本技术 吸水性磨砂剂、其制造方法、以及化妆品 (Water-absorbing abrasive, method for producing same, and cosmetic ) 是由 山本朋依 神吉利彦 于 2019-03-27 设计创作，主要内容包括：本发明提供一种吸水而具有适度的硬度、皮肤刺激少、皮肤的按摩效果良好的磨砂剂。本发明的磨砂剂的纯水吸水倍率为30倍以上,且在吸水而溶胀至30倍质量的状态下的压缩断裂应力为0.14～1.40N。(The invention provides a scrub agent which absorbs water, has moderate hardness, is less in skin irritation and has good skin massage effect. The polishing agent has a pure water absorption rate of 30 times or more, and a compression fracture stress of 0.14 to 1.40N in a state of swelling to 30 times the mass by absorbing water.)

1. A water-absorbing abrasive agent characterized by having a pure water absorption capacity of 30 times or more and a compressive fracture stress of 0.14 to 1.40N in a state of swelling to 30 times the mass by absorbing water.

2. The water-absorbent sanding agent according to claim 1, wherein the water-absorbent sanding agent has a structure in which the second polymer is infiltrated in the first polymer particles.

3. The water-absorbent sanding agent according to claim 1 or 2,

the first polymer particles comprise a polymer of a first monomeric component comprising at least one of monomer A and a salt thereof,

the second polymer comprising a polymer of a second monomeric component comprising at least one of monomer B and salts thereof,

the acid dissociation index of the monomer A is less than the acid dissociation index of the monomer B.

4. The water-absorbent abrasive material according to claim 3, wherein the difference Δ pKa between the acid dissociation index of the monomer B and the acid dissociation index of the monomer A is 1.5 or more.

5. The water-absorbent sanding agent according to claim 4,

the monomer A is an unsaturated sulfonic acid monomer;

the monomer B is a water-soluble ethylenically unsaturated monomer.

6. The water-absorbent sanding agent according to any one of claims 1 to 5,

the water-absorbing abrasive agent is in the form of particles, substantially spherical particles, or a shape in which substantially spherical particles are aggregated.

7. A method for producing a water-absorbing abrasive agent, comprising the steps of:

preparing first polymer particles;

infiltrating a second monomer component comprising at least one of monomer B and a salt thereof, which is to form a second polymer, into the first polymer particles;

polymerizing the second monomer component infiltrated into the first polymer particles to form a structure in which the second polymer is infiltrated in the first polymer particles.

8. A cosmetic composition comprising the water-absorbing abrasive according to any one of claims 1 to 7.

Technical Field

The present invention relates to a water-absorbing sanding agent (スクラブ) (japanese original text for sanding agent), a method for producing the same, and a cosmetic.

Background

Conventionally, in cosmetics such as skin detergents, from the viewpoint of improving washing ability, a scrub agent is sometimes blended. The improvement of the washing ability by the scrub agent mainly involves the following 2 actions. The first action is an action of the polishing agent rubbing off dirt by colliding with the dirt, and the second action is an action of the polishing agent adhering to the dirt by thickening, thereby peeling off the dirt.

As cosmetics in which a scrub agent is widely used, facial cleansing milk can be cited. In the facial cleanser, the scrub agent is mainly used for removing sebum and aged cutin in pores.

In addition, the scrub agent is used in cosmetics in applications in which a massage effect is imparted by utilizing stimulation caused by collision of the scrub agent with the skin, in addition to a detergent. Examples of such cosmetics include body milk, massage cream, and the like.

As conventional abrasives to be blended in cosmetics, for example, particles of activated carbon, pulverized products of talc (clay mineral such as hydrotalcite), synthetic resin particles such as polyethylene, spherical porous silica, and the like are known (see, for example, patent documents 1 and 2). Further, as a grinding agent, a granulated grinding agent is known in which activated carbon powder or talc powder is granulated with a water-soluble resin and the shape is disintegrated by stress; or a gel-like abrasive obtained by granulating or crosslinking a water-soluble polymer.

Disclosure of Invention

Problems to be solved by the invention

When activated carbon particles, ground talc, synthetic resin particles such as polyethylene, and abrasives such as spherical porous silica are blended in detergents, they can exert a high cleaning effect, but have problems of hard particles and strong skin irritation. Further, the granular abrasive disintegrates immediately when an external force is applied thereto, and thus causes little skin irritation such as pain, but it is difficult to obtain a skin massage effect. Further, the gel-like abrasive is soft and thus causes little skin irritation such as pain, but it is difficult to obtain a skin massage effect.

The main object of the present invention is to provide a water-absorbing abrasive agent which absorbs water and has appropriate hardness, causes little skin irritation, and has a good skin massage effect.

Means for solving the problems

The present inventors have conducted intensive studies to solve the above problems. As a result, it has been found that water-absorbent resin particles having a pure water absorption capacity of 30 times or more and a compressive fracture stress of 0.14 to 1.40N in a state of being swollen by water absorption to 30 times by mass are water-absorbent resin particles having water absorption, moderate hardness, less skin irritation, and good skin massage effect. The present invention has been completed based on such findings.

That is, the present invention provides an invention having the following configuration.

The water-absorbing abrasive agent according to item 1 has a pure water absorption capacity of 30 times or more and a compressive fracture stress of 0.14 to 1.40N in a state of swelling to 30 times the mass by absorbing water.

The water-absorbent sanding agent according to claim 1, wherein the water-absorbent sanding agent has a structure in which the first polymer particles are impregnated with the second polymer.

Item 3. the water-absorbent sanding agent according to item 1 or 2, wherein,

the first polymer particles contain a polymer of a first monomer component containing at least one of a monomer a and a salt thereof;

the second polymer contains a polymer of a second monomer component containing at least one of a monomer B and a salt thereof;

the acid dissociation index of the monomer A is smaller than that of the monomer B.

The water-absorbent abrasive according to claim 3, wherein a difference (Δ pKa) between an acid dissociation index of the monomer B and an acid dissociation index of the monomer a is 1.5 or more.

Item 5. the water-absorbent sanding agent according to item 4, wherein,

the monomer A is an unsaturated sulfonic acid monomer;

the monomer B is a water-soluble ethylenically unsaturated monomer.

The water-absorbent sanding agent according to any one of claims 1 to 5, wherein the water-absorbent sanding agent has a granular shape, a substantially spherical shape, or a shape in which substantially spherical particles are aggregated.

The method of producing a water-absorbent abrasive material according to item 7, comprising the steps of:

preparing first polymer particles;

penetrating a second monomer component containing at least one of monomer B and a salt thereof, which is to form a second polymer, into the first polymer particles;

the second monomer component permeated into the first polymer particles is polymerized to form a structure in which the second polymer permeates into the first polymer particles.

The cosmetic according to item 8, which contains the water-absorbent abrasive according to any one of items 1 to 6.

Effects of the invention

According to the present invention, a water-absorbent abrasive agent which absorbs water and has appropriate hardness, causes little skin irritation, and has a good skin massage effect can be provided. Further, the present invention can provide a method for producing the water-absorbent abrasive agent, and a cosmetic containing the water-absorbent abrasive agent.

Detailed Description

The water-absorbing abrasive agent is characterized in that the water absorption capacity of pure water is 30 times or more, and the compressive fracture stress in a state of swelling to 30 times the mass after absorbing water is 0.14-1.40N. The water-absorbent abrasive of the present invention has such specific physical properties, and therefore, when used in cosmetics or the like, can suitably absorb water to provide a massage effect on the skin with appropriate hardness and less skin irritation.

The water-absorbent abrasive agent of the present invention can be suitably produced by a production method including, for example, the following steps. That is, the water-absorbent abrasive agent of the present invention can be suitably produced by a production method including the steps of: preparing first polymer particles; a step of allowing a second monomer component containing at least one of the monomer B and a salt thereof, which is to form a second polymer, to penetrate into the first polymer particles; and a step of polymerizing the second monomer component impregnated into the first polymer particles to form a structure in which the second polymer is impregnated into the first polymer particles.

The water-absorbing abrasive, the method for producing the same, and the cosmetic containing the water-absorbing abrasive of the present invention will be described in detail below.

In the numerical ranges recited in the present specification, the upper limit or the lower limit of a numerical range in one stage may be arbitrarily combined with the upper limit or the lower limit of a numerical range in another stage. In the numerical ranges described in the present specification, the upper limit or the lower limit of the numerical range may be replaced with the values shown in the examples or the values unambiguously derived from the examples. In the present specification, a numerical value connected to "means a numerical range including numerical values before and after" to "as a lower limit value and an upper limit value.

(Water-absorbent abrasive)

The water-absorbent abrasive of the present invention is a particulate water-absorbent resin. The water-absorbent abrasive agent (particulate water-absorbent resin) preferably has a structure in which the second polymer is impregnated into the first polymer particles. The structure in which the second polymer permeates into the first polymer particles means a structure in which the second polymer exists from the surface to the inside of the first polymer particles, and is formed, for example, by a method for producing a water-absorbent abrasive agent, which will be described later.

In the water-absorbent sanding agent, the second polymer may be present only on the surface of the first polymer particles and in the vicinity thereof, or may reach from the surface to the center. The second polymer covers at least a portion of the surface of the first polymer particles, may cover the entirety of the surface, or may cover a portion of the surface. In addition, the second polymer may be linked to a plurality of first polymer particles.

The water-absorbent sanding agent of the present invention having the above-described physical properties can be produced, for example, by allowing a second monomer component containing at least one of the monomer B and a salt thereof, which is to form a second polymer, to permeate into the first polymer particles, and polymerizing the second monomer component permeated into the first polymer particles. Details of this method will be described later.

The lower limit of the water absorption capacity of the water-absorbent abrasive is 30 times, preferably 70 times, and more preferably 100 times, from the viewpoint of having appropriate hardness due to water absorption, causing little skin irritation, and improving the massage effect of the skin. The upper limit of the pure water absorption capacity is, for example, 400 times, preferably 300 times, and more preferably 200 times.

The pure water absorption capacity of the water-absorbent abrasive is a value measured by the method described in examples.

The water-absorbing abrasive has a compressive breaking stress of 0.14 to 1.40N from the viewpoint of having a moderate hardness by absorbing water, causing less skin irritation, and having a good massage effect on the skin. The lower limit of the compressive fracture stress is 0.14N, preferably 0.17N, and more preferably 0.2N. The upper limit of the compressive fracture stress is preferably 1.13N, more preferably 0.85N, and still more preferably 0.60N.

The compressive fracture stress of the water-absorbent abrasive is a measured value in a state where the water-absorbent abrasive absorbs water in pure water and swells 30 times the mass of the water-absorbent abrasive.

The compressive breaking stress of the water-absorbent abrasive is measured by the method described in examples.

From the viewpoint of imparting water absorption and appropriate hardness, causing less skin irritation, and improving the massage effect on the skin, the lower limit of the median particle diameter of the water-absorbent abrasive is preferably 10 μm, more preferably 100 μm, still more preferably 130 μm, and particularly preferably 150 μm. The upper limit of the median particle diameter of the water-absorbent sanding agent is preferably 500. mu.m, more preferably 350. mu.m, still more preferably 250. mu.m, and particularly preferably 200. mu.m.

The median particle diameter of the water-absorbent sanding agent can be measured using a JIS standard sieve, specifically, a value measured by the method described in examples.

The shape of the water-absorbent abrasive is, for example, a granular shape, a substantially spherical shape, a shape in which substantially spherical particles are aggregated, a shape in which irregularly crushed particles, irregularly crushed particles are aggregated, a plate shape, or the like. When a water-absorbent abrasive is produced by the reversed-phase suspension polymerization method or the spray droplet polymerization method, the water-absorbent abrasive having a substantially spherical particle shape such as a granular shape, a spherical shape or an ellipsoidal shape, or a shape in which substantially spherical particles are aggregated is obtained. In addition, when a water-absorbent abrasive is produced by an aqueous solution polymerization method, a water-absorbent abrasive having a shape in which irregularly crushed or irregularly crushed particles are aggregated is obtained. The water-absorbing abrasive is preferably in the form of particles, substantially spherical particles, or a form in which substantially spherical particles are aggregated, from the viewpoint of absorbing water to give appropriate hardness, causing less skin irritation, and improving the massage effect on the skin.

From the viewpoint of imparting water absorption and appropriate hardness, reducing skin irritation, and improving the massaging effect of the skin, it is preferable that the water-absorbent abrasive has first polymer particles of a first monomer component containing at least one of monomer a and a salt thereof, a second polymer of a second monomer component containing at least one of monomer B and a salt thereof, and the acid dissociation index (pKa) of monomer a is smaller than the acid dissociation index of monomer B. From the same viewpoint, the difference between the acid dissociation index of the monomer B and the acid dissociation index of the monomer a (Δ pKa ═ acid dissociation index of the monomer B — acid dissociation index of the monomer a) is preferably 1.5 or more, more preferably 2.0 or more, and still more preferably 2.5 or more. Further, Δ pKa is, for example, 4.0 or less, preferably 3.5 or less, and more preferably 3.0 or less.

It is considered that if the difference (Δ pKa) between the acid dissociation index of the monomer B and the acid dissociation index of the monomer a is within the above range, the osmotic pressure of the first polymer particles becomes high, and the monomer B and/or a salt thereof contained in the second monomer component is difficult to ionize, whereby the second monomer component is favorably permeated into the first polymer particles.

The acid dissociation index of the monomer A is preferably 0.5 to 2.5, more preferably 1.0 to 2.0, and further preferably 1.0 to 1.5. The acid dissociation index of the monomer B is preferably 2.0 to 6.0, more preferably 3.5 to 5.0, and further preferably 4.0 to 4.5.

The acid dissociation index (pKa) of the monomers a and B is a value measured by the method described in examples.

The monomer A is preferably an unsaturated sulfonic acid monomer. Further, as the monomer B, a water-soluble ethylenically unsaturated monomer can be preferably mentioned. Specific examples of the unsaturated sulfonic acid-based monomer, the water-soluble ethylenically unsaturated monomer, and salts thereof are exemplified by a method for producing a water-absorbent abrasive agent to be described later.

(method for producing Water-absorbing abrasive agent)

In a method for producing a water-absorbent abrasive, first polymer particles are prepared. Next, a second monomer component comprising at least one of monomer B and a salt thereof, which is to form a second polymer, is infiltrated into the first polymer particles. Further, the second monomer component permeated into the first polymer particles is polymerized to obtain a water-absorbent sanding agent having a structure in which the second polymer permeates into the first polymer particles. These steps are described in detail below.

The first polymer particles are obtained by polymerizing a first monomer component containing at least one of the monomer a and a salt thereof. In the case where the first monomer component contains only the monomer a and/or a salt thereof, the first polymer particles have a structure in which only the monomer a and/or a salt thereof is polymerized. On the other hand, in the case where the first monomer component contains a monomer other than the monomer a and the salt thereof (hereinafter referred to as monomer X), the first polymer particles have a structure in which the monomer X is further copolymerized in the monomer a and/or the salt thereof. The monomer a and its salt are not particularly limited as long as the second monomer component to form the second polymer can permeate and polymerize after constituting the first polymer particles.

The first polymer particles are preferably a polymer using a monomer a having the above-described acid dissociation index, more preferably a polymer using an unsaturated sulfonic acid monomer as the monomer a, and still more preferably a polymer obtained using an unsaturated sulfonic acid monomer having the above-described acid dissociation index as the monomer a.

The first polymer particles can be suitably produced, for example, by subjecting the first monomer component to reversed-phase suspension polymerization in a hydrocarbon dispersion medium in the presence of an internal crosslinking agent and a radical polymerization initiator.

< Process for polymerizing first monomer component >

[ first monomer component ]

The first monomer component forming the first polymer particles may contain only the monomer a, may contain only a salt of the monomer a, may contain only the monomer a and a salt thereof, or may contain the monomer X in addition to the monomer a and/or a salt thereof.

The monomer a is preferably a monomer that sufficiently satisfies the acid dissociation index, and is preferably an unsaturated monomer having a strong electrolyte such as an unsaturated sulfonic acid monomer. Specific examples of the unsaturated sulfonic acid monomer include vinylsulfonic acid, allylsulfonic acid, methallylsulfonic acid, styrenesulfonic acid, 2- (meth) acrylamido-2-methylpropanesulfonic acid, 3-allyloxy-2-hydroxypropanesulfonic acid, sulfoethyl (meth) acrylate, sulfopropyl (meth) acrylate, 2-hydroxysulfopropyl (meth) acrylate, sulfoethylmaleimide, and 3-sulfopropyl methacrylate, and 2- (meth) acrylamido-2-methylpropanesulfonic acid is preferably used. In the present specification, "acrylic acid" and "methacrylic acid" are collectively referred to as "(meth) acrylic acid". The monomer A may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

When 2 or more monomers a are used in combination, a part of the monomers a preferably have an acid dissociation index within the above range, and more preferably all the monomers a have an acid dissociation index within the above range.

When 2 or more monomers a are used in combination, the monomer a used as a reference for determining the difference (Δ pKa) between the acid dissociation index and the monomer B is the monomer having the highest acid dissociation index among the 2 or more monomers a.

The monomer X may be used alone in 1 kind or in combination of 2 or more kinds. For example, when an unsaturated sulfonic acid monomer such as 2- (meth) acrylamido-2-methylpropanesulfonic acid is used as the monomer a, a monomer B (e.g., (meth) acrylic acid and/or (meth) acrylamide as a water-soluble ethylenically unsaturated monomer) described later may be copolymerized as the monomer X. In the first monomer component, the proportion of the monomer a and/or a salt thereof (the proportion of the monomer a and a salt thereof in total when both are contained) is preferably 70 mol% or more, more preferably 80 mol% or more, and still more preferably 90 mol% or more. The upper limit of the proportion of the monomer A and/or a salt thereof is 100 mol%. When the proportion of the monomer a and/or a salt thereof is 100 mol%, the monomer X is not contained in the first monomer component.

When the salt of the monomer a has an acid group, for example, as in 2- (meth) acrylamido-2-methylpropanesulfonic acid, the salt is obtained by neutralizing the acid group with a basic neutralizing agent. Examples of such a basic neutralizing agent include alkali metal salts such as sodium hydroxide, sodium carbonate, sodium hydrogencarbonate, potassium hydroxide and potassium carbonate; ammonia, and the like. In addition, these basic neutralizing agents can be used in the form of an aqueous solution for the purpose of simplifying the neutralization operation. The above-mentioned basic neutralizing agents may be used alone or in combination of 2 or more.

The neutralization degree of the monomer a with the basic neutralizing agent is preferably 10 to 100 mol%, more preferably 30 to 100 mol%, further preferably 40 to 100 mol%, and further preferably 50 to 100 mol%, based on the neutralization degree of all acid groups of the monomer a.

The first monomer component is preferably dispersed in the hydrocarbon dispersion medium in the state of an aqueous solution for reversed-phase suspension polymerization. The first monomer component can be dispersed in the hydrocarbon dispersion medium with an increased efficiency by being prepared as an aqueous solution. The concentration of the first monomer component in the aqueous solution is preferably in the range of 20 mass% to the saturation concentration. The concentration of the first monomer component is more preferably 55% by mass or less, still more preferably 50% by mass or less, and still more preferably 45% by mass or less. On the other hand, the concentration of the first monomer component is more preferably 25% by mass or more, still more preferably 28% by mass or more, and still more preferably 30% by mass or more.

[ Hydrocarbon Dispersion Medium ]

Examples of the hydrocarbon dispersion medium include aliphatic hydrocarbons having 6 to 8 carbon atoms such as n-hexane, n-heptane, 2-methylhexane, 3-methylhexane, 2, 3-dimethylpentane, 3-ethylpentane, and n-octane; alicyclic hydrocarbons such as cyclohexane, methylcyclohexane, cyclopentane, methylcyclopentane, trans-1, 2-dimethylcyclopentane, cis-1, 3-dimethylcyclopentane, and trans-1, 3-dimethylcyclopentane; aromatic hydrocarbons such as benzene, toluene, and xylene. Among these hydrocarbon dispersion media, n-hexane, n-heptane, and cyclohexane are particularly suitable from the viewpoint of easy industrial availability, stable quality, and low cost. These hydrocarbon dispersion media may be used alone, or a mixture of 2 or more kinds may be used in combination. Examples of the mixture of the hydrocarbon dispersion medium include commercially available products such as EXXSOL Heptane (manufactured by Exxon Mobil Co., Ltd.; containing 75 to 85 mass% of Heptane and its isomer hydrocarbons).

The amount of the hydrocarbon dispersion medium used is preferably 100 to 1500 parts by mass, more preferably 200 to 1400 parts by mass, per 100 parts by mass of the first monomer component to be polymerized in the first stage. As described later, the reversed-phase suspension polymerization is performed in 1-stage (single-stage) or 2-or more-stage, and the first-stage polymerization refers to a polymerization reaction in the first stage of the single-stage polymerization or the multi-stage polymerization (the same applies to the following).

[ Dispersion stabilizer ]

In the reversed-phase suspension polymerization, a dispersion stabilizer may be used in order to improve the dispersion stability of the first monomer component in the hydrocarbon dispersion medium.

(surfactant)

As the dispersion stabilizer, a surfactant can be used. Examples of the surfactant include sucrose fatty acid esters, polyglycerol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene glycerol fatty acid esters, sorbitol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil, polyoxyethylene hydrogenated castor oil, alkylallylformaldehyde condensed polyoxyethylene ethers, polyoxyethylene polyoxypropylene block copolymers, polyoxyethylene polyoxypropylene alkyl ethers, polyethylene glycol fatty acid esters, alkyl glycosides, N-alkylglucamides, polyoxyethylene fatty acid amides, polyoxyethylene alkylamines, phosphate esters of polyoxyethylene alkyl ethers, and phosphate esters of polyoxyethylene alkylallylethers. Among these surfactants, sorbitan fatty acid esters, polyglycerol fatty acid esters, and sucrose fatty acid esters are preferably used, particularly from the viewpoint of dispersion stability of the monomers. These surfactants may be used alone, or 2 or more of them may be used in combination.

The amount of the surfactant used is preferably 0.1 to 30 parts by mass, more preferably 0.3 to 20 parts by mass, per 100 parts by mass of the first monomer component to be polymerized in the first stage.

(Polymer dispersant)

Further, the dispersion stabilizer may be used together with the surfactant as well as a polymer dispersant. Examples of the polymer-based dispersant include maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene-propylene copolymer, maleic anhydride-modified EPDM (ethylene-propylene-diene-terpolymer), maleic anhydride-modified polybutadiene, maleic anhydride-ethylene copolymer, maleic anhydride-propylene copolymer, maleic anhydride-ethylene-propylene copolymer, maleic anhydride-butadiene copolymer, polyethylene, polypropylene, ethylene-propylene copolymer, oxidized polyethylene, oxidized polypropylene, oxidized ethylene-propylene copolymer, ethylene-acrylic acid copolymer, ethyl cellulose, and ethyl hydroxyethyl cellulose. Among these polymeric dispersants, maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, maleic anhydride-modified ethylene-propylene copolymer, maleic anhydride-ethylene copolymer, maleic anhydride-propylene copolymer, maleic anhydride-ethylene-propylene copolymer, polyethylene, polypropylene, ethylene-propylene copolymer, oxidized polyethylene, oxidized polypropylene, and oxidized ethylene-propylene copolymer are preferably used, in particular, from the viewpoint of dispersion stability of the monomers. These polymeric dispersants may be used alone, or 2 or more of them may be used in combination.

The amount of the polymeric dispersant used is preferably 0.1 to 30 parts by mass, more preferably 0.3 to 20 parts by mass, based on 100 parts by mass of the first monomer component in the first stage.

[ internal crosslinking agent ]

Examples of the internal crosslinking agent include (poly) ethylene glycol [ "(poly)" means that a prefix of "poly" is present or absent; the same applies to di-or tri (meth) acrylates of polyhydric alcohols such as (poly) propylene glycol, 1, 4-butanediol, trimethylolpropane, and (poly) glycerin; unsaturated polyesters obtained by reacting the above-mentioned polyhydric alcohol with an unsaturated acid such as maleic acid or fumaric acid; bisacrylamides such as N, N-methylenebisacrylamide; di (meth) acrylates or tri (meth) acrylates obtained by reacting a polyepoxide with (meth) acrylic acid; urethane di (meth) acrylates obtained by reacting a polyisocyanate such as tolylene diisocyanate or hexamethylene diisocyanate with hydroxyethyl (meth) acrylate; compounds having 2 or more polymerizable unsaturated groups such as allylated starch, allylated cellulose, diallyl phthalate, N', N ″ -triallyl isocyanate, and divinylbenzene; polyglycidyl compounds such as diglycidyl compounds and triglycidyl compounds, e.g., (poly) ethylene glycol diglycidyl ether, (poly) propylene glycol diglycidyl ether, and (poly) glycerol diglycidyl ether; epihalohydrin compounds such as epichlorohydrin, epibromohydrin, and α -methyl epichlorohydrin; compounds having 2 or more reactive functional groups such as isocyanate compounds such as 2, 4-tolylene diisocyanate and hexamethylene diisocyanate; and oxetane compounds such as 3-methyl-3-oxetanemethanol, 3-ethyl-3-oxetanemethanol, 3-butyl-3-oxetanemethanol, 3-methyl-3-oxetaneethanol, 3-ethyl-3-oxetaneethanol, and 3-butyl-3-oxetaneethanol. Among these internal crosslinking agents, a polyglycidyl compound is preferably used, a diglycidyl ether compound is more preferably used, and (poly) ethylene glycol diglycidyl ether, (poly) propylene glycol diglycidyl ether, and (poly) glycerol diglycidyl ether are preferably used. These internal crosslinking agents may be used alone, or 2 or more kinds may be used in combination.

The lower limit of the amount of the internal crosslinking agent used is preferably 0.00001 mol, more preferably 0.00005 mol, still more preferably 0.0001 mol, and particularly preferably 0.0005 mol, based on 1 mol of the first monomer component. The upper limit value is preferably 0.01 mol, more preferably 0.005 mol, still more preferably 0.003 mol, and particularly preferably 0.002 mol, based on 1 mol of the first monomer component.

[ radical polymerization initiator ]

In the production of the first polymer particles, the first monomer component is polymerized by using a radical polymerization initiator. Examples of the radical polymerization initiator include azo compounds and peroxides. Furthermore, a combination of an azo compound and a peroxide may be used. The radical polymerization initiator may be in the form of a powder or an aqueous solution.

(azo compound)

Examples of the azo compound include 1- { (1-cyano-1-methylethyl) azo } carboxamide and 2,2' -azobis [2- (N-phenylamidino) propane]Dihydrochloride, 2' -azobis {2- [ N- (4-chlorophenyl) amidino group]Propane dihydrochloride, 2' -azobis {2- [ N- (4-hydroxyphenyl) amidino group]Propane } dihydrochloride, 2' -azobis [2- (N-benzylamidino) propane]Dihydrochloride, 2' -azobis [2- (N-allylamidino) propane]Dihydrochloride, 2 '-azobis (2-amidinopropane) dihydrochloride, 2' -azobis {2- [ N- (2-hydroxyethyl) amidino group]Propane } dihydrochloride, 2' -azobis [2- (5-methyl-2-imidazolin-2-yl) propane]Dihydrochloride, 2' -azobis [2- (2-imidazolin-2-yl) propane]Dihydrochloride, 2' -azobis [2- (4,5,6, 7-tetrahydro-1H-1, 3-diaza ]-2-yl) propane]Dihydrochloride salt, 2' -azobis [2- (5-hydroxy-3, 4,5, 6-tetrahydropyrimidin-2-yl) propane]Dihydrochloride, 2' -azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl]Propane } dihydrochloride, 2 '-azobis [2, 2' -azobis ], [ solution of a salt of a carboxylic acid2- (2-imidazolin-2-yl) propane]2,2' -azobis { 2-methyl-N- [1, 1-bis (hydroxymethyl) -2-hydroxyethyl]Propionamide }, 2' -azobis { 2-methyl-N- [1, 1-bis (hydroxymethyl) ethyl]Propionamide }, 2' -azobis [ 2-methyl-N- (2-hydroxyethyl) propionamide ]]2,2' -azobis (2-methylpropionamide) dihydrochloride, 4' -azobis-4-cyanovaleric acid, 2' -azobis [2- (hydroxymethyl) propionitrile]2,2' -azobis [2- (2-imidazolin-2-yl) propane]Disulfate dihydrate, 2' -azobis [ N- (2-carboxyethyl) -2-methylpropionamidine]Tetrahydrate, 2' -azobis [ 2-methyl-N- (2-hydroxyethyl) propionamide]And azo compounds. Among these, 2 '-azobis (2-amidinopropane) dihydrochloride and 2,2' -azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl group are preferable]Propane } dihydrochloride, 2' -azobis [ N- (2-carboxyethyl) -2-methylpropionamidine]A tetrahydrate. These azo compounds may be used alone, or 2 or more of them may be used in combination.

(peroxide)

Examples of the peroxide include persulfates such as potassium persulfate, ammonium persulfate, and sodium persulfate; peroxides such as methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, t-butyl peroxyacetate, t-butyl peroxyisobutyrate, t-butyl peroxypivalate, and hydrogen peroxide. Among these peroxides, potassium persulfate, ammonium persulfate, sodium persulfate, and hydrogen peroxide are preferably used, and potassium persulfate, ammonium persulfate, and sodium persulfate are more preferably used. These peroxides may be used alone, or 2 or more of them may be used in combination.

The amount of the radical polymerization initiator used is preferably 0.00005 mol or more, and more preferably 0.0001 mol or more, based on 1 mol of the first monomer component. The amount of the radical polymerization initiator used is preferably 0.005 mol or less, and more preferably 0.002 mol or less, based on 1 mol of the first monomer component.

When the azo compound and the peroxide are used in combination, the ratio of the amount of the azo compound and the peroxide to be used is preferably 40% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and yet more preferably 70% by mass or more of the total amount of the azo compound and the peroxide to be used. On the other hand, the azo compound is preferably at a ratio of 95% by mass or less, more preferably at a ratio of 90% by mass or less, even more preferably at a ratio of 85% by mass or less, and even more preferably at a ratio of 80% by mass or less, of the total amount of the azo compound and the peroxide used. In addition, the mass ratio (azo compound: peroxide) is preferably 8: 12 to 19: 1.

[ other ingredients ]

In the production of the first polymer particles, the reverse phase suspension polymerization may be performed by adding an additive to the first monomer component as desired. Examples of the additive include a chain transfer agent and a thickener.

(chain transfer agent)

For example, the polymerization of the first monomer component may be carried out in the presence of a chain transfer agent.

Examples of the chain transfer agent include thiols such as ethanethiol, propanethiol, and dodecanethiol; mercaptic acids such as thioglycolic acid, thiomalic acid, dimethyldithiocarbamic acid, diethyldithiocarbamic acid, or salts thereof; secondary alcohols such as isopropyl alcohol; phosphorous acid compounds such as orthophosphoric acid salts such as phosphorous acid, disodium phosphite, dipotassium phosphite, and diammonium phosphite, and acidic salts of phosphorous acid such as sodium hydrogen phosphite, potassium hydrogen phosphite, and ammonium hydrogen phosphite; phosphoric acid compounds such as normal salts of phosphoric acid such as phosphoric acid, sodium phosphate, potassium phosphate, and ammonium phosphate, and acidic salts of phosphoric acid such as sodium dihydrogen phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, and diammonium hydrogen phosphate; hypophosphorous acid compounds such as hypophosphites including hypophosphorous acid, sodium hypophosphite, potassium hypophosphite, and ammonium hypophosphite; pyrophosphoric acid, tripolyphosphoric acid, polyphosphoric acid, and salts thereof; trimethyl phosphate, nitrilotrimethylene triphosphonic acid, and the like. These chain transfer agents may be used alone, or 2 or more of them may be used in combination. Further, as the chain transfer agent, a hydrate thereof may also be used.

The amount of the chain transfer agent to be used is preferably 0.00001 to 0.0005 mol, more preferably 0.000025 to 0.00012 mol, based on 1 mol of the first monomer component.

(thickening agent)

Further, the aqueous solution containing the first monomer component may be added with a thickener to perform reversed-phase suspension polymerization. By adjusting the viscosity of the aqueous solution by adding the thickener in this manner, the median particle diameter obtained in the reversed-phase suspension polymerization can be controlled.

Examples of the thickener include hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, carboxymethylcellulose, polyacrylic acid (partially) neutralized product, polyethylene glycol, polyacrylamide, polyethyleneimine, dextrin, sodium alginate, polyvinyl alcohol, polyvinyl pyrrolidone, and polyethylene oxide. If the stirring speed during polymerization is the same, the larger the viscosity of the aqueous solution of the first monomer component is, the larger the median particle diameter of the obtained particles tends to be.

[ reversed-phase suspension polymerization ]

In carrying out the reversed-phase suspension polymerization, an aqueous solution containing the first monomer component is dispersed in a hydrocarbon dispersion medium, for example, in the presence of a dispersion stabilizer. In this case, the timing of adding the dispersion stabilizer (surfactant, polymeric dispersant) may be either before or after the aqueous solution of the first monomer component is dispersed in the hydrocarbon dispersion medium, as long as it is before the polymerization reaction is started.

Among them, from the viewpoint of easily reducing the amount of the hydrocarbon dispersion medium remaining in the obtained first polymer particles, it is preferable to disperse the aqueous solution of the first monomer component in the hydrocarbon dispersion medium in which the polymeric dispersant is dispersed, and then further add a surfactant to the dispersion medium, and then perform polymerization.

In the method for producing the first polymer particles, such reverse phase suspension polymerization may be performed in 1 stage or 2 or more stages. In addition, from the viewpoint of improving productivity, the method can be performed in 2 to 3 stages.

In the case of performing reverse phase suspension polymerization in multiple stages of 2 or more, after the reverse phase suspension polymerization in the first stage, the first monomer component may be added to and mixed with the reaction mixture obtained in the polymerization reaction in the first stage, and the reverse phase suspension polymerization in the second stage and subsequent stages may be performed by the same method as in the first stage. In the reversed-phase suspension polymerization in each of the second stage and the subsequent stage, it is preferable to perform the reversed-phase suspension polymerization by adding the internal crosslinking agent, the azo compound, the peroxide, and the like as necessary within a range of a molar ratio of each component to the first monomer component based on the amount of the first monomer component added at the time of the reversed-phase suspension polymerization in each of the second stage and the subsequent stage in addition to the first monomer component. In the production of the first polymer particles, it is preferable that the polymerization is also carried out in the presence of at least one of an azo compound and a peroxide in the polymerization in the second and subsequent stages.

The reaction temperature of the polymerization reaction of the first monomer component is preferably 20 to 110 ℃, more preferably 40 to 90 ℃ from the viewpoint of improving the economy by rapidly carrying out the polymerization and shortening the polymerization time, and easily removing the heat of polymerization to smoothly carry out the reaction. The reaction time is preferably 0.1 to 4 hours.

In the above manner, the first polymer particles can be suitably produced. The median particle diameter of the first polymer particles may be appropriately adjusted so that the median particle diameter of the water-absorbent abrasive obtained after the second polymer permeates is within the above range, and is preferably 1 to 450 μm, for example.

< penetration of second monomer component >

Next, a second monomer component comprising at least one of monomer B and a salt thereof, which is to form a second polymer, is infiltrated in the first polymer particles. The second monomer component may contain only the monomer B, only a salt of the monomer B, only the monomer B and a salt thereof, or a monomer other than the monomer B and a salt thereof (hereinafter referred to as monomer Y) in addition to the monomer B and/or a salt thereof.

The monomer B is preferably a monomer that sufficiently satisfies the acid dissociation index, and is preferably a water-soluble ethylenically unsaturated monomer. Examples of the water-soluble ethylenically unsaturated monomer include (meth) acrylic acid; nonionic monomers such as (meth) acrylamide, N-dimethyl (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, N-hydroxymethyl (meth) acrylamide, and polyethylene glycol mono (meth) acrylate; amino group-containing unsaturated monomers such as N, N-diethylaminoethyl (meth) acrylate, N-diethylaminopropyl (meth) acrylate, and diethylaminopropyl (meth) acrylamide, and quaternary ammonium compounds thereof. Among these water-soluble ethylenically unsaturated monomers, (meth) acrylic acid, (meth) acrylamide, and N, N-dimethylacrylamide are preferable, and (meth) acrylic acid is more preferable, from the viewpoint of easy industrial availability and the like. The monomer B may be used alone in 1 kind, or may be used in combination of 2 or more kinds.

When 2 or more monomers B are used in combination, a part of the monomers B preferably have an acid dissociation index within the above range, and more preferably all the monomers B have an acid dissociation index within the above range.

When 2 or more monomers B are used in combination, the monomer B having the smallest acid dissociation index among the 2 or more monomers B is used as a reference for determining the difference (Δ pKa) between the acid dissociation index and the acid dissociation index of the monomer a.

The monomer Y may be used alone in 1 kind, or may be used in combination of 2 or more kinds. For example, when a water-soluble ethylenically unsaturated monomer such as (meth) acrylic acid is used as the monomer B, the above-mentioned monomer a (e.g., allylsulfonic acid and/or methallylsulfonic acid as an unsaturated sulfonic acid-based monomer) can be used as the monomer Y. In the second monomer component, the proportion of the monomer B and/or a salt thereof (the proportion of the total amount of the monomer B and the salt thereof when both are contained) is preferably 70 mol% or more, more preferably 80 mol% or more, and still more preferably 90 mol% or more. The upper limit of the proportion of the monomer B and/or a salt thereof is 100 mol%. When the proportion of the monomer B and/or a salt thereof is 100 mol%, the monomer Y is not contained in the second monomer component.

When the monomer B has an acid group such as (meth) acrylic acid, the salt of the monomer B is obtained by neutralizing the acid group with a basic neutralizing agent. Examples of such a basic neutralizing agent include those similar to those used for the neutralization of the monomer A.

The degree of neutralization of the monomer B with the basic neutralizing agent is preferably 10 to 100 mol%, more preferably 30 to 90 mol%, even more preferably 40 to 85 mol%, and even more preferably 50 to 80 mol%, based on the degree of neutralization of all acid groups contained in the monomer B.

As a method of infiltrating the second monomer component in the first polymer particles, for example, the first polymer particles and the second monomer component may be mixed. In this case, the first polymer particles are preferably dried in advance in order to allow the second monomer component to sufficiently permeate into the first polymer particles. The first polymer particles can be dried in the same manner as in the step of drying the water-absorbent abrasive agent described later.

In addition, in order to allow the second monomer component to sufficiently permeate into the first polymer particles, the second monomer component preferably permeates into the first polymer particles in an aqueous solution state. More specifically, by impregnating the first polymer particles in an aqueous solution of the second monomer component, the second monomer component can be appropriately impregnated into the first polymer particles. The dipping time is, for example, 0.3 to 48 hours.

The concentration of the second monomer component in the aqueous solution of the second monomer component is preferably in the range of 20 mass% to the saturated concentration. The concentration of the second monomer component is more preferably 55% by mass or less, still more preferably 50% by mass or less, and still more preferably 45% by mass or less. On the other hand, the concentration of the second monomer component is more preferably 25% by mass or more, still more preferably 28% by mass or more, and still more preferably 30% by mass or more.

From the viewpoint of appropriately polymerizing the second monomer component permeated into the first polymer particles, the second monomer component may be permeated into the first polymer particles in a state of an aqueous dispersion in which at least 1 component among the internal crosslinking agent, the azo-based compound, the peroxide, and the like is further dispersed. Examples of these components include those similar to those exemplified in the polymerization step of the first monomer component. The amounts of these components used may be the same as those exemplified for the first monomer component.

< Process for polymerizing second monomer component >

Next, the second monomer component permeated into the first polymer particles is polymerized to obtain a water-absorbent sanding agent having a structure in which the second polymer permeates into the first polymer particles.

The polymerization of the second monomer component can be carried out under the conditions of reversed-phase suspension polymerization in the same manner as the polymerization of the first monomer component. That is, for example, the first polymer particles permeated with the second monomer component are dispersed in the hydrocarbon dispersion medium in the presence of the dispersion stabilizer. In this case, the timing of adding the dispersion stabilizer (surfactant, polymeric dispersant) may be either before or after the first polymer particles into which the second monomer component has permeated are dispersed in the hydrocarbon dispersion medium, as long as the polymerization reaction of the second monomer component is started. The hydrocarbon dispersion medium and the dispersion stabilizer are the same as those exemplified in the polymerization step of the first monomer component, and their amounts used may be the same as those exemplified for the first monomer component.

In addition, from the viewpoint of easily reducing the amount of the hydrocarbon dispersion medium remaining in the water-absorbent sanding agent obtained, it is preferable that the first polymer particles having the second monomer component permeated therein are dispersed in the hydrocarbon dispersion medium in which the polymeric dispersant is dispersed, and then the polymerization is carried out after further adding a surfactant.

The reaction temperature of the polymerization reaction of the second monomer component is preferably 20 to 110 ℃, more preferably 40 to 90 ℃ from the viewpoint of improving the economy by rapidly carrying out the polymerization and shortening the polymerization time, and easily removing the heat of polymerization to smoothly carry out the reaction. The reaction time is preferably 0.5 to 4 hours.

< post-crosslinking Process >

In the method for producing a water-absorbent abrasive, the aqueous gel-like material of the water-absorbent abrasive having a structure in which the second polymer is permeated into the first polymer particles, which is obtained by the above-described method, can be post-crosslinked (post-crosslinking reaction) with a post-crosslinking agent. The post-crosslinking reaction is preferably carried out in the presence of a post-crosslinking agent after the polymerization of the second monomer component. In this way, by performing a post-crosslinking reaction on the hydrogel-like material of the water-absorbent abrasive after polymerization, the crosslinking density in the vicinity of the surface of the water-absorbent abrasive can be increased, and the hardness can be adjusted to a more appropriate range in which the massage effect is excellent.

Examples of the post-crosslinking agent include compounds having 2 or more reactive functional groups. Examples thereof include polyhydric alcohols such as ethylene glycol, propylene glycol, 1, 4-butanediol, trimethylolpropane, glycerin, polyoxyethylene glycol, polyoxypropylene glycol, and polyglycerin; polyglycidyl compounds such as (poly) ethylene glycol diglycidyl ether, (poly) glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, (poly) propylene glycol polyglycidyl ether, and (poly) glycerol polyglycidyl ether; halogenated epoxy compounds such as epichlorohydrin, epibromohydrin, and α -methyl epichlorohydrin; isocyanate compounds such as 2, 4-tolylene diisocyanate and hexamethylene diisocyanate; oxetane compounds such as 3-methyl-3-oxetanemethanol, 3-ethyl-3-oxetanemethanol, 3-butyl-3-oxetanemethanol, 3-methyl-3-oxetaneethanol, 3-ethyl-3-oxetaneethanol and 3-butyl-3-oxetaneethanol; 1, 2-ethylidenebisOxazoline or the likeAn oxazoline compound; carbonate compounds such as ethylene carbonate; bis [ N, N-bis (beta-hydroxyethyl)]Hydroxyalkylamide compounds such as adipamide. Among these postcrosslinkers, preferred are (poly) ethylene glycol diglycidyl ether, (poly) glycerol diglycidyl ether, and (poly) glycerol triglycidyl etherPolyglycidyl compounds such as glycidyl ether, trimethylolpropane triglycidyl ether, (poly) propylene glycol polyglycidyl ether, and (poly) glycerol polyglycidyl ether. These postcrosslinkers may be used alone or in combination of 2 or more.

The amount of the post-crosslinking agent used is preferably 0.00001 to 0.01 mol, more preferably 0.00005 to 0.005 mol, and still more preferably 0.0001 to 0.002 mol, based on 1 mol of the second monomer component used in the polymerization.

The post-crosslinking agent may be added as it is, or may be added as an aqueous solution, or may be added as a solution using a hydrophilic organic solvent as a solvent, if necessary. Examples of the hydrophilic organic solvent include lower alcohols such as methanol, ethanol, n-propanol, and isopropanol; ketones such as acetone and methyl ethyl ketone; diethyl ether, di

Ethers such as alkane and tetrahydrofuran; amides such as N, N-dimethylformamide; sulfoxides such as dimethyl sulfoxide, and the like. These hydrophilic organic solvents may be used alone, or 2 or more kinds thereof may be used in combination, or may be used in the form of a mixed solvent with water.

The time for adding the post-crosslinking agent may be set to a time after the polymerization reaction of the second monomer component is almost completely completed. The post-crosslinking agent is added in the presence of moisture preferably in the range of 1 to 400 parts by mass, more preferably in the range of 5 to 200 parts by mass, even more preferably in the range of 10 to 100 parts by mass, and even more preferably in the range of 20 to 70 parts by mass, based on 100 parts by mass of the total of the first monomer component and the second monomer component. The amount of water is the total amount of water contained in the polymerization reaction system and water used as needed when the post-crosslinking agent is added.

The reaction temperature in the post-crosslinking reaction is preferably 50 to 250 ℃, more preferably 60 to 180 ℃, still more preferably 60 to 140 ℃, and still more preferably 70 to 120 ℃. The reaction time of the post-crosslinking reaction is preferably 1 to 300 minutes, and more preferably 5 to 200 minutes.

< drying Process >

The method for producing the water-absorbent abrasive may include a drying step after the polymerization of the second monomer component. The drying step is a step of removing water, a hydrocarbon dispersion medium, and the like from the system (which means a reaction vessel) by distillation by applying energy such as heat from the outside to the system after polymerization of the second monomer component. In the case of dehydration from the aqueous gel after polymerization, the system in which the aqueous gel is dispersed in the hydrocarbon dispersion medium is heated, and water and the hydrocarbon dispersion medium are temporarily distilled off to the outside of the system by azeotropic distillation. In this case, if only the distilled hydrocarbon dispersion medium is returned to the system, continuous azeotropic distillation can be performed. In this case, the temperature in the system during drying is maintained at a temperature not higher than the azeotropic temperature with the hydrocarbon dispersion medium, and therefore the resin is less likely to deteriorate. Subsequently, water and the hydrocarbon dispersion medium were distilled off to obtain a water-absorbent sanding agent.

The drying step may be performed under normal pressure or under reduced pressure. In addition, from the viewpoint of improving the drying efficiency, the drying may be performed under a gas flow such as nitrogen. When the drying step is performed under normal pressure, the drying temperature is preferably 70 to 250 ℃, more preferably 80 to 180 ℃, still more preferably 80 to 140 ℃, and still more preferably 90 to 130 ℃. When the drying step is performed under reduced pressure, the drying temperature is preferably 40 to 160 ℃, and more preferably 50 to 120 ℃.

In the case where the post-crosslinking step is performed using a post-crosslinking agent, it is preferable to perform the drying step after the post-crosslinking step.

The water-absorbent sanding agent may contain additives according to the purpose. Examples of such additives include inorganic powders, surfactants, oxidizing agents, reducing agents, metal chelating agents, radical chain terminators (ラジカル, a linkage inhibitor), antioxidants, antibacterial agents, deodorants, and the like. The water-absorbent sanding agent may contain various components (for example, a hydrocarbon dispersion medium, a dispersion stabilizer, an internal crosslinking agent, an azo compound, a peroxide, a chain transfer agent, a thickener, and the like) or reactants thereof used in the polymerization of the first polymer particles and the second polymer.

(cosmetics)

The cosmetic of the present invention contains the water-absorbent abrasive of the present invention.

The water-absorbent abrasive of the present invention may be used as it is (as individual particles), or may be used as a plurality of individual bodies (as an aggregate of individual particles), and the plurality of individual bodies are usually blended with a cosmetic material. The cosmetic of the present invention may contain a polishing agent other than the water-absorbent polishing agent of the present invention. The total amount of the abrasives contained in the cosmetic of the present invention is, for example, 0.1 to 10 mass%, preferably 0.3 to 7.0 mass%, and more preferably 0.5 to 5.0 mass%. In addition, the water-absorbent abrasive agent of the present invention is preferably contained in the cosmetic in an amount of 50 mass% or more, more preferably 80 mass% or more, and still more preferably 100 mass% of the abrasive agent contained in the cosmetic.

Examples of the polishing agent other than the water-absorbent polishing agent of the present invention that can be contained in a cosmetic product include particles of activated carbon, ground products of talc, synthetic resin particles such as polyethylene, spherical porous silica, and the like.

The cosmetic of the present invention may contain various components contained in known cosmetics, in addition to the water-absorbent abrasive. Such components are not particularly limited, and examples thereof include a detergent component, a solvent, water, an oily component, a perfume, a colorant, a surfactant, alcohols, a thickener, a gel, an ultraviolet absorber, an antioxidant, a humectant, a preservative, an antibacterial agent, a pH adjuster, a whitening agent, vitamins, a refreshing agent, a blood circulation-promoting agent, and the like. The cosmetic may contain only 1 kind of the ingredients, or may contain 2 or more kinds of the ingredients.

The formulation of the cosmetic of the present invention is not particularly limited, and a known cosmetic formulation may be used. Specific examples of the dosage form include a liquid, cream, gel, and the like.

The cosmetic of the present invention can be suitably used as, for example, a skin-cleansing preparation, a massage cosmetic, a skin-care cosmetic, and the like for the face, hair, other body parts, and the like.