Skin cosmetics for external use

Abstract

To provide a preparation for external use which is excellent in use feeling without stickiness and has high film formability and excellent wear resistance.SOLUTION: There is provided a preparation for external use which comprises the following components (A) and (B). The component (A): ionic polymer particles having a glass transition temperature of more than 5°C and 120°C or less which contains (a) one or more hydrophobic monomers selected from the group consisting of styrene and its derivative, a vinyl ester and a hydrophobic acrylic monomer and (b) a constitutional unit derived from an ionic hydrophilic monomer or its salt in which the mass ratio (a) / (b) is 99.5 / 0.5 to 80 / 20 and the component (B): one or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), a predetermined polyoxyalkylene derivative (B5), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylpropane-2-enoic acid 2-ethylhexyl ester (B10) and methylphenylpolysiloxane (B11).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to an external preparation. [Background technology]

[0002] BACKGROUND ART It is known that acrylic polymer emulsions are used in external preparations such as skin cosmetics to improve water resistance, sebum resistance, and adhesion to the skin. For example, Patent Document 1 discloses that an aqueous polymer emulsion obtained by emulsion polymerization of a specific monomer has good storage stability and provides a coating film with excellent water resistance and adhesion. Patent Document 2 discloses that a cosmetic resin obtained by emulsion polymerization of a specific monomer mixture has excellent transparency and an excellent balance of properties such as water resistance, adhesion, cosmetic durability, and firming feeling. Patent Document 3 discloses that a water-in-oil skin cosmetic preparation, which contains a specific resin emulsion, a partially crosslinked organopolysiloxane polymer, and a volatile silicone, and is substantially free of surfactants, has excellent transparency, water resistance, and sebum resistance, has a smooth feel, and has good storage stability. Patent Document 4 discloses that a soap-free polymer emulsion for cosmetics, which is obtained by copolymerizing a specific hydrophobic monomer and a specific hydrophilic monomer and has a glass transition temperature of 5 to -50°C, forms a flexible film and has excellent blend stability (ethanol resistance) and application properties (resistance to creasing). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-327019 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-2207 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-8585 [Patent Document 4] Japanese Patent Application Laid-Open No. 2006-8561 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned technology, there is room for improvement in the acrylic polymer emulsion or the topical preparation containing the same in terms of achieving both less stickiness and an excellent feel when used, as well as excellent film-forming ability and good abrasion resistance of the formed film. An object of the present invention is to provide an external preparation which is less sticky, has an excellent feel when used, has high film-forming ability and is excellent in abrasion resistance. [Means for solving the problem]

[0005] The present inventors have found that the above-mentioned problems can be solved by preparing an external preparation containing a combination of predetermined ionic polymer particles and a predetermined compound. That is, the present invention relates to an external preparation containing the following components (A) and (B): Component (A): (a) one or more hydrophobic monomers selected from the group consisting of styrene and its derivatives, vinyl esters, and hydrophobic acrylic monomers; and (b) Ionic hydrophilic monomer or its salt and a structural unit derived from Ionic polymer particles having a mass ratio (a) / (b) of (a) to (b) of 99.5 / 0.5 to 80 / 20 and a glass transition temperature of more than 5°C and not more than 120°C. Ingredient (B): One or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative (B5) represented by the following general formula (I), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and a methylphenylpolysiloxane (B11). Z-{O(PO) l (EO) m -(BO) n H} a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1. [Effects of the Invention]

[0006] The topical preparation of the present invention is useful, for example, as a skin cosmetic, because it is less sticky, has an excellent feel when used, has a high film-forming ability, and is highly abrasion-resistant. DETAILED DESCRIPTION OF THE INVENTION

[0007] [Topical preparations] The topical preparation of the present invention contains the following components (A) and (B). Component (A): (a) one or more hydrophobic monomers selected from the group consisting of styrene and its derivatives, vinyl esters, and hydrophobic acrylic monomers; and (b) Ionic hydrophilic monomer or its salt wherein the mass ratio of (a) to (b) is 99.5 / 0.5 to 80 / 20, and the glass transition temperature is higher than 5°C and not higher than 120°C. Ingredient (B): One or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative (B5) represented by the following general formula (I), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and a methylphenylpolysiloxane (B11). Z-{O(PO) l (EO) m -(BO) n H} a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1. The topical preparation of the present invention contains the above-mentioned components (A) and (B), and therefore is less sticky, has an excellent feel when used, has high film-forming ability, and is highly abrasion-resistant.

[0008] The reason why the topical preparation of the present invention exhibits the above-mentioned effects is believed to be as follows. Ionic polymers can be emulsified in water to form ionic polymer particles, which can be used in various topical preparations such as skin cosmetics. However, if the glass transition temperature (Tg) of the polymer used is low, the product will be very sticky and have a poor feel when used. On the other hand, if the Tg of the polymer is too high, the film-forming ability will be reduced, and the formed film will tend to have poor abrasion resistance and water resistance. In the topical preparation of the present invention, the use of ionic polymer particles with a Tg of above 5°C as component (A) can reduce stickiness and improve the feel during use. Furthermore, because component (A) contains structural units derived from a specific hydrophobic monomer, it has good affinity with component (B), which will be described later. By using component (A) in combination with component (B), the resulting topical preparation has high film-forming ability, even when the Tg of component (A) is relatively high, exceeding 5°C, and the resulting film is thought to have good abrasion resistance and water resistance. Furthermore, when the Tg of component (A) is 120°C or less, the resulting topical preparation can maintain good film-forming ability.

[0009] The topical preparation of the present invention can be, for example, a topical preparation to be applied to hair or skin. From the viewpoint of the effects of being less sticky, having an excellent feel when used, and of forming a film with good abrasion resistance, the topical preparation of the present invention is preferably a cosmetic, and more preferably a skin cosmetic. There are no particular limitations on the dosage form of the external preparation, and it may be in any dosage form, such as liquid, foam, paste, cream, or solid. Furthermore, the topical preparation of the present invention is preferably an oil-in-water topical preparation in which component (A) and component (B) form an oil-in-water emulsion.

[0010] <Component (A): Ionic polymer particles> The topical preparation of the present invention contains, as component (A), (a) one or more hydrophobic monomers selected from the group consisting of styrene and its derivatives, vinyl esters, and hydrophobic acrylic monomers; and (b) Ionic hydrophilic monomer or its salt The ionic polymer particles contain structural units derived from the above, the mass ratio of (a) to (b) being (a) / (b) being 99.5 / 0.5 to 80 / 20, and the glass transition temperature being higher than 5°C and not higher than 120°C. By including component (A) in the topical preparation of the present invention, the above-mentioned effects are achieved, resulting in a topical preparation that is less sticky, has an excellent feel when used, and forms a film with good abrasion resistance.

[0011] As used herein, the term "hydrophobic monomer" refers to a monomer whose homopolymer dissolves in water at 20° C. in an amount of 1% by mass or less, and the term "hydrophilic monomer" refers to a monomer whose homopolymer dissolves in water at 20° C. in an amount of more than 1% by mass. Specific examples of hydrophobic monomers and hydrophilic monomers will be described later.

[0012] (glass transition temperature (Tg)) The ionic polymer particles, which are component (A), have a glass transition temperature (Tg) of more than 5° C. and not more than 120° C. A Tg of more than 5° C. can reduce the stickiness of the topical preparation and improve the feel when used, while a Tg of not more than 120° C. can maintain good film-forming ability. From the viewpoint of suppressing stickiness, the Tg of the ionic polymer particles is preferably 10°C or higher, more preferably 15°C or higher, even more preferably 20°C or higher, and even more preferably 30°C or higher. From the viewpoint of improving film-forming ability, i.e., the abrasion resistance of the film, the Tg is preferably 105°C or lower, more preferably 100°C or lower, even more preferably 95°C or lower, still more preferably 70°C or lower, even more preferably 50°C or lower, and even more preferably 45°C or lower. The specific range of Tg of the ionic polymer particles is preferably 10 to 105°C, more preferably 10 to 100°C, even more preferably 15 to 100°C, still more preferably 20 to 100°C, still more preferably 30 to 95°C, still more preferably 30 to 70°C, still more preferably 30 to 50°C, and still more preferably 30 to 45°C.

[0013] The glass transition temperature of the ionic polymer particles may be measured by a conventional differential scanning calorimeter (DSC) using thoroughly dried polymer particles. Alternatively, if the Tg of each homopolymer of each monomer constituting the polymer particles is known, it can be calculated using the following formula (1):

number

[0014] The glass transition temperature of the homopolymer of each monomer is described in, for example, J. Brandrup et al., "Polymer Handbook, Fourth Edition," John Wiley & Sons, Inc.

[0015] (Hydrophobic Monomer (a)) Component (A) has (a) a structural unit derived from one or more hydrophobic monomers selected from the group consisting of styrene and its derivatives, vinyl esters, and hydrophobic acrylic monomers (hereinafter simply referred to as "hydrophobic monomer (a)").

[0016] [Styrene and its derivatives] Examples of styrene and its derivatives used as the hydrophobic monomer (a) include styrene, α-methylstyrene, methylstyrene, butylstyrene, t-butylstyrene, dimethylstyrene, divinylbenzene, etc., and these can be used alone or in combination. Among these, styrene is preferred from the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy.

[0017] [Vinyl ester] Examples of vinyl esters used as the hydrophobic monomer (a) include vinyl esters having an alkyl group or an alkenyl group, such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl hexanoate, vinyl octanoate, vinyl decanoate, vinyl laurate, vinyl palmitate, and vinyl stearate, and these can be used alone or in combination. Among these, vinyl acetate is preferred from the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy.

[0018] [Hydrophobic acrylic monomer] The hydrophobic acrylic monomer used as the hydrophobic monomer (a) is preferably a (meth)acrylic acid ester, for example, a (meth)acrylic acid ester represented by the following general formula (1), the solubility of which homopolymer in water at 20° C. is 1% by mass or less. In this specification, "(meth)acrylic acid" means methacrylic acid or acrylic acid. [ka] In formula (1), R 1 represents a hydrogen atom or a methyl group, and R 2 represents a chain aliphatic group having 1 to 24 carbon atoms, a cyclic aliphatic group having 5 to 24 carbon atoms, an aryl group having 6 to 24 carbon atoms, or an aralkyl group having 7 to 24 carbon atoms, which may have a hydroxy group; R A represents an alkylene group having 2 to 4 carbon atoms, and n1 is an integer of 0 to 30.

[0019] In formula (1), R 1 represents a hydrogen atom or a methyl group, and R 2 represents a chain aliphatic group having from 1 to 24 carbon atoms, a cyclic aliphatic group having from 5 to 24 carbon atoms, an aryl group having from 6 to 24 carbon atoms, or an aralkyl group having from 7 to 24 carbon atoms, which may have a hydroxy group. The chain aliphatic group may be either a linear aliphatic group or a branched aliphatic group. R 2 is preferably a chain aliphatic group having from 1 to 24 carbon atoms, more preferably an alkyl group having from 1 to 24 carbon atoms, even more preferably an alkyl group having from 1 to 12 carbon atoms, still more preferably an alkyl group having from 1 to 8 carbon atoms, and still more preferably an alkyl group having from 1 to 6 carbon atoms, from the viewpoints of suppressing stickiness, ease of emulsion polymerization in producing polymer particles, availability, and economy. R A represents an alkylene group having 2 to 4 carbon atoms, and is preferably an ethylene group or a propylene group from the viewpoint of availability and economy. When n1 is 2 or more, a plurality of R A may be the same or different. n1 is preferably an integer of 0 or more and 10 or less, and is more preferably 0 from the viewpoints of suppressing stickiness, ease of emulsion polymerization in producing polymer particles, availability, and economy.

[0020] Among the hydrophobic acrylic monomers, (meth)acrylic acid esters represented by the general formula (1) are preferred from the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy. The number of carbon atoms in the alkyl is preferably 1 to 24, more preferably 1 to 12, even more preferably 1 to 8, and still more preferably 1 to 6. Specific examples of the (meth)acrylic acid alkyl ester include one or more selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, and lauryl (meth)acrylate.

[0021] From the viewpoints of improving the abrasion resistance and suppressing stickiness of the coating, ease of emulsion polymerization in producing the polymer particles, availability, and economy, the hydrophobic monomer (a) is preferably at least one selected from the group consisting of styrene, vinyl acetate, and (meth)acrylic acid alkyl esters, more preferably at least one selected from the group consisting of styrene and (meth)acrylic acid alkyl esters, even more preferably at least one selected from the group consisting of styrene and (meth)acrylic acid alkyl esters having 1 to 8 carbon atoms in the alkyl, and even more preferably at least one selected from the group consisting of styrene and (meth)acrylic acid alkyl esters having 1 to 6 carbon atoms in the alkyl.

[0022] From the viewpoint of controlling the Tg of the ionic polymer particles, which are component (A), the hydrophobic monomer (a) preferably contains the following monomer (a1) and monomer (a2). (a1) one or more selected from the group consisting of styrene, vinyl acetate, and (meth)acrylic acid esters having a glass transition temperature of a homopolymer higher than 5°C (a2) (Meth)acrylic acid ester having a homopolymer glass transition temperature of 5°C or less

[0023] <Monomer (a1)> The monomer (a1) is at least one selected from the group consisting of styrene, vinyl acetate, and (meth)acrylic acid esters having a glass transition temperature of more than 5°C when formed as a homopolymer. Of the monomers (a1), the (meth)acrylic acid ester having a homopolymer glass transition temperature of more than 5°C is preferably a (meth)acrylic acid ester represented by the general formula (1) above, the homopolymer glass transition temperature of which is more than 5°C. From the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy, the monomer (a1) is preferably one or more selected from the group consisting of styrene and (meth)acrylic acid alkyl esters, and the number of carbon atoms in the alkyl is preferably 1 or more and 24 or less, more preferably 1 or more and 12 or less, even more preferably 1 or more and 8 or less, and still more preferably 1 or more and 6 or less.

[0024] Specific examples of the monomer (a1) include styrene (100°C), vinyl acetate (32°C), methyl acrylate (10°C), tert-butyl acrylate (107°C), isobornyl acrylate (94°C), methyl methacrylate (105°C), ethyl methacrylate (65°C), n-butyl methacrylate (20°C), isobutyl methacrylate (53°C), sec-butyl methacrylate (60°C), tert-butyl methacrylate (118°C), cyclohexyl methacrylate (83°C), benzyl methacrylate (54°C), isobornyl methacrylate (170°C), and 2-hydroxyethyl methacrylate (75°C), and one or more of these can be used. The temperatures in parentheses are the Tg of the homopolymer of each monomer. Among these, from the viewpoints of Tg control of the ionic polymer particles, ease of emulsion polymerization in the production of polymer particles, availability, and economy, one or more selected from the group consisting of styrene, vinyl acetate, methyl methacrylate, and ethyl methacrylate are preferred, one or more selected from the group consisting of styrene, methyl methacrylate, and ethyl methacrylate are more preferred, and one or more selected from the group consisting of styrene and methyl methacrylate are even more preferred.

[0025] <Monomer (a2)> Monomer (a2) is a (meth)acrylic acid ester having a homopolymer glass transition temperature of 5°C or less, and preferably includes a (meth)acrylic acid ester represented by the general formula (1) having a homopolymer glass transition temperature of 5°C or less. From the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy, among (meth)acrylic acid esters, (meth)acrylic acid alkyl esters are preferred, and the number of carbon atoms in the alkyl is preferably 1 or more and 24 or less, more preferably 1 or more and 12 or less, even more preferably 1 or more and 8 or less, and still more preferably 1 or more and 6 or less.

[0026] Specific examples of monomer (a2) include ethyl acrylate (-24°C), n-butyl acrylate (-54°C), 2-ethylhexyl acrylate (-50°C), 2-ethylhexyl methacrylate (-10°C), isodecyl methacrylate (-41°C), and lauryl methacrylate (-65°C), and one or more of these can be used. The temperature in parentheses is the Tg of the homopolymer of each monomer. Among these, from the viewpoints of Tg control of the ionic polymer particles, ease of emulsion polymerization in the production of the polymer particles, availability, and economy, one or more selected from the group consisting of ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate are preferred, and n-butyl acrylate is more preferred.

[0027] In terms of controlling the Tg of the ionic polymer particles, the combination of monomer (a1) and monomer (a2) preferably has a difference in glass transition temperature between the homopolymer of monomer (a1) and the homopolymer of monomer (a2) of 15°C or more. From the viewpoint of controlling the Tg of the ionic polymer particles, the difference in glass transition temperature is more preferably 50° C. or more, even more preferably 80° C. or more, still more preferably 100° C. or more, still more preferably 120° C. or more, and still more preferably 140° C. or more. Furthermore, from the viewpoint of controlling the Tg of the ionic polymer particles and the viewpoints of monomer availability and economy, the difference in glass transition temperature is preferably 200° C. or less, more preferably 180° C. or less, and still more preferably 170° C. or less. The specific range of the difference in glass transition temperature between the homopolymer of monomer (a1) and the homopolymer of monomer (a2) is preferably 15 to 200°C, more preferably 50 to 200°C, even more preferably 50 to 180°C, still more preferably 80 to 180°C, still more preferably 100 to 180°C, still more preferably 120 to 180°C, and still more preferably 140 to 170°C.

[0028] When the monomer (a1) and the monomer (a2) are used in combination as the hydrophobic monomer (a), the mass ratio (a1) / (a2) is preferably 50 / 50 to 99 / 1, more preferably 50 / 50 to 90 / 10, even more preferably 54 / 46 to 85 / 15, still more preferably 54 / 46 to 80 / 20, still more preferably 60 / 40 to 80 / 20, and even more preferably 65 / 35 to 80 / 20. Within this range, the Tg of the ionic polymer particles can be easily adjusted to a range of more than 5°C and not more than 120°C, and excellent effects of suppressing stickiness and improving abrasion resistance can be achieved.

[0029] The total amount of the monomer (a1) and the monomer (a2) in the hydrophobic monomer (a) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and still more preferably 90% by mass or more, from the viewpoint of controlling the Tg of the ionic polymer particles and facilitating emulsion polymerization in the production of the polymer particles, and the upper limit is 100% by mass.

[0030] (Ionic hydrophilic monomer or its salt (b)) Component (A) has a structural unit derived from an ionic hydrophilic monomer or a salt thereof (b). By having this structural unit, component (A) can be dispersed in an aqueous medium to form emulsion particles.

[0031] Examples of the ionic hydrophilic monomer or a salt thereof include an anionic hydrophilic monomer having an anionic group or a salt thereof, and a cationic hydrophilic monomer having a cationic group or a salt thereof.

[0032] Examples of the anionic group in the anionic hydrophilic monomer include a carboxy group, a sulfonic acid group, and a phosphate group. From the viewpoints of ease of emulsion polymerization in the production of polymer particles, availability, and economy, one or more groups selected from the group consisting of a carboxy group and a sulfonic acid group are preferred.

[0033] Specific examples of the anionic hydrophilic monomer or a salt thereof include vinyl compounds having a carboxy group, such as (meth)acrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, and styrenecarboxylic acid, or salts thereof; vinyl compounds having a sulfonic acid group, such as 2-(meth)acrylamido-2-methylpropanesulfonic acid, styrenesulfonic acid, and (meth)acryloyloxyethylsulfonic acid, or salts thereof; vinyl compounds having a phosphate group, such as vinylphosphonic acid and (meth)acryloyloxyethylphosphate, or salts thereof; and the like. One or more of these may be used.

[0034] Examples of cationic hydrophilic monomers or salts thereof include (meth)acrylic acid esters or (meth)acrylamides having a dialkylamino group, such as dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, dimethylaminopropyl (meth)acrylamide, and diethylaminopropyl (meth)acrylamide, and salts or quaternary salts thereof; diallylamine compounds, such as diallylmethylamine and diallylamine, and salts or quaternary salts thereof; and one or more of these may be used.

[0035] Among the above, from the viewpoint of the freedom of formulation of the topical agent, the ease of emulsion polymerization in the production of polymer particles, availability, and economic efficiency, the ionic hydrophilic monomer or salt thereof (b) is preferably an anionic hydrophilic monomer or salt thereof, more preferably a monomer having one or more anionic groups selected from the group consisting of a carboxy group and a sulfonic acid group, or a salt thereof, and even more preferably one or more selected from the group consisting of acrylic acid, methacrylic acid, a sulfonic acid group-containing monomer, and salts thereof, and from the viewpoint of the ease of emulsion polymerization in the production of polymer particles, availability, and economic efficiency, even more preferably one or more selected from the group consisting of acrylic acid, methacrylic acid, styrenesulfonic acid, and salts thereof, even more preferably one or more selected from the group consisting of acrylic acid, methacrylic acid, and salts thereof, even more preferably one or more selected from the group consisting of acrylic acid, methacrylic acid, and salts thereof, and even more preferably acrylic acid or a salt thereof.

[0036] Component (A) contains structural units derived from a hydrophobic monomer (a) and an ionic hydrophilic monomer or a salt thereof (b), and the mass ratio of (a) to (b), (a) / (b), is 99.5 / 0.5 to 80 / 20. When the mass ratio (a) / (b) is within this range, it is easy to control the Tg of the ionic polymer particles, which are component (A), within a desired range, and the emulsion stability is good. From the above viewpoints, the mass ratio (a) / (b) is preferably 99 / 1 to 85 / 15, more preferably 99 / 1 to 90 / 10, even more preferably 99 / 1 to 95 / 5, still more preferably 98.5 / 1.5 to 95 / 5, and even more preferably 98 / 2 to 95 / 5.

[0037] Component (A) may further contain structural units derived from monomers other than the hydrophobic monomer (a) and the ionic hydrophilic monomer or its salt (b), but from the viewpoints of emulsion stability, abrasion resistance of the coating, and suppression of stickiness, the total amount of the hydrophobic monomer (a) and the ionic hydrophilic monomer or its salt (b) in all monomers constituting component (A) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and still more preferably 98% by mass or more, with the upper limit being 100% by mass.

[0038] (Method of producing component (A)) The ionic polymer particles, component (A), can be produced by polymerizing the monomer components and microparticulating them. Examples of polymerization and microparticulation methods include (1) a method in which the monomer components are polymerized and microparticulated by emulsion polymerization, suspension polymerization, dispersion polymerization, or the like, and (2) a method in which the monomer components are polymerized by solution polymerization or the like to obtain a polymer, and then microparticulated by phase inversion emulsification, suspension, or the like. Of these, method (1) is preferred from the viewpoint of ease of production, and emulsion polymerization is more preferred. Among emulsion polymerization methods, soap-free emulsion polymerization, which does not add a surfactant, is preferred from the viewpoint of low skin irritation and water resistance of the resulting component (A). Soap-free emulsion polymerization is a method of emulsion polymerization of monomer components in the presence of a polymerization initiator without using emulsifiers such as surfactants, polymeric emulsifiers, or reactive surfactants, and can be carried out by known methods. In emulsion polymerization, the solvent used is primarily water, and in some cases, a hydrophilic solvent such as a lower alcohol may be mixed in. The reaction temperature is set below the boiling point of the solvent. The monomer concentration in the reaction system is not particularly limited, but is preferably 1 to 60% by mass from the viewpoints of production efficiency and suppression of aggregates. According to the above method, component (A) is obtained as an aqueous dispersion (emulsion) of ionic polymer particles. It is preferable to incorporate this form into the topical agent of the present invention from the standpoints of stability and ease of handling.

[0039] The reaction method is preferably a radical polymerization reaction from the viewpoints of ease of production and freedom in monomer composition. The radical polymerization initiator used in the radical polymerization reaction may be a known compound, and examples thereof include peroxide initiators such as ammonium persulfate, sodium persulfate, potassium persulfate, benzoyl peroxide, and lauroyl peroxide; and azo initiators such as 2,2'-azobis(2-methylpropionamidine) dihydrochloride, 2,2'-azobis(2,4-dimethylvaleronitrile), and 2,2'-azobisisobutyronitrile. From the viewpoint of performing soap-free emulsion polymerization, water-soluble radical polymerization initiators are preferred, and one or more selected from the group consisting of ammonium persulfate, sodium persulfate, and potassium persulfate are more preferred. The amount of the radical polymerization initiator used can be appropriately selected depending on the type and concentration of the monomer components, the type of the radical polymerization initiator, the polymerization temperature, etc., but is usually preferably 0.01 mass% or more and 10 mass% or less, and more preferably 0.1 mass% or more and 5 mass% or less, based on the total amount of monomers.

[0040] From the viewpoint of improving the abrasion resistance and water resistance of the coating, the average particle size of component (A) is preferably 150 nm or more, more preferably 200 nm or more, and even more preferably 300 nm or more. From the viewpoint of emulsion stability, the average particle size of component (A) is preferably 800 nm or less, more preferably 700 nm or less, even more preferably 600 nm or less, and even more preferably 550 nm or less. The specific range of the average particle size of component (A) is preferably 150 to 800 nm, more preferably 200 to 700 nm, even more preferably 300 to 600 nm, and even more preferably 300 to 550 nm. In this specification, the average particle size of component (A) refers to the median diameter (D50). This average particle size is measured at 25°C using a laser diffraction / scattering particle size distribution analyzer, and can be measured specifically by the method described in the Examples.

[0041] When component (A) is produced by the aforementioned soap-free emulsion polymerization method, it is easy to adjust the average particle size to the above range. Furthermore, since the soap-free emulsion polymerization method does not require the use of a surfactant, it is also preferable in that the resulting component (A) is less irritating to the skin.

[0042] From the viewpoints of improving the abrasion resistance of the coating and suppressing stickiness, the content of component (A) in the topical preparation is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 0.8% by mass or more, and even more preferably 1.2% by mass or more. From the viewpoint of suppressing stickiness, the content is preferably 5% by mass or less, more preferably 4% by mass or less, even more preferably 3.5% by mass or less, even more preferably 3% by mass or less, and even more preferably 2.5% by mass or less. The specific range of the content of component (A) in the topical preparation is preferably 0.1 to 5% by mass, more preferably 0.3 to 4% by mass, even more preferably 0.5 to 3.5% by mass, even more preferably 0.8 to 3% by mass, and even more preferably 1.2 to 2.5% by mass.

[0043] <Ingredient (B)> The topical preparation of the present invention contains, as component (B), one or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative represented by the following general formula (I) (B5), a polyoxyalkylene alkylglucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and methylphenylpolysiloxane (B11). Z-{O(PO) l (EO) m -(BO) n H} a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1.

[0044] The use of component (B) in the topical preparation of the present invention is believed to improve the film-forming ability of the resulting topical preparation and improve the abrasion resistance and water resistance of the film formed, even when the Tg of component (A) is in the relatively high range of more than 5° C., due to the aforementioned effects. Component (B) can be used alone or in combination with other components. Among the components (B), the oxyalkylene derivative (B5) represented by general formula (I), the polyoxyalkylene alkyl glucoside (B6), the alkyl benzoate (B8), the (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and the methylphenyl polysiloxane (B11) are described below.

[0045] (Oxyalkylene derivative (B5) represented by general formula (I)) Component (B5) is an oxyalkylene derivative represented by the following general formula (I): As component (B5), a mixture of different oxyalkylene derivatives represented by the following general formula (I) may be used. Z-{O(PO) l (EO) m -(BO) n H} a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1.

[0046] In general formula (I), Z represents a residue obtained by removing a hydroxyl groups from a compound containing 3 to 9 hydroxyl groups, where a is in the range of 3 to 9. Examples of compounds containing 3 to 9 hydroxy groups include glycerin and trimethylolpropane when they have 3 hydroxy groups, erythritol, pentaerythritol, sorbitol, alkyl glycosides, and diglycerin when they have 4 hydroxy groups, xylitol when they have 5 hydroxy groups, dipentaerythritol, sorbitol, and inositol when they have 6 hydroxy groups, sucrose and trehalose when they have 8 hydroxy groups, and maltitol when they have 9 hydroxy groups.

[0047] From the viewpoint of improving the abrasion resistance and suppressing stickiness of the coating of the topical preparation, among compounds containing 3 to 9 hydroxy groups, compounds containing 3 to 6 hydroxy groups are preferred, compounds containing 3 to 4 hydroxy groups are more preferred, and compounds containing 3 hydroxy groups are even more preferred. That is, the compound is preferably one or more selected from the group consisting of glycerin and trimethylolpropane, more preferably glycerin. In addition, component (B5) is a compound containing 3 to 9 hydroxy groups, in which all of the hydroxy groups are -{O(PO) l (EO) m -(BO) n It is preferred that the group is substituted with {H}.

[0048] In general formula (I), PO represents an oxypropylene group. 1 represents the average number of moles of PO units added, and from the viewpoints of improving the abrasion resistance of the coating and suppressing stickiness, it is preferably 0.5 or more, more preferably 2 or more. From the same viewpoints, it is preferably 10 or less, more preferably 5 or less. The specific range of 1 is preferably 0.5 to 10, more preferably 2 to 10, and even more preferably 2 to 5.

[0049] In general formula (I), EO represents an oxyethylene group. m represents the average number of moles of EO units added, and from the viewpoints of solubility in water, improving the abrasion resistance of the coating, and suppressing stickiness, it is preferably 1 or more, more preferably 2 or more. From the viewpoints of improving the abrasion resistance of the coating and suppressing stickiness, it is preferably 20 or less, more preferably 10 or less, and even more preferably 8 or less. The specific range of m is preferably 1 to 20, more preferably 2 to 10, and even more preferably 2 to 8.

[0050] However, from the viewpoint of improving the abrasion resistance of the coating, suppressing stickiness, solubility in water, and moisture retention, the mass ratio (PO / EO) is preferably in the range of 1 / 5 to 5 / 1, and more preferably 1 / 4 to 4 / 1. The order in which the PO and EO units are added is not particularly limited, and they may be added randomly or in blocks, although random addition is preferred from the standpoint of improving the abrasion resistance of the coating.

[0051] In general formula (I), BO represents an oxyalkylene group having 4 carbon atoms, such as an oxybutylene group or an oxytetramethylene group, with an oxybutylene group being preferred. The "butylene group" referred to here includes —CH—CH(C—H)—, —CH(CH)—CH(CH)—, and —CH—C(CH)—, and may be one or more of these. n represents the average number of moles of BO units added, and is preferably 0.5 or more, more preferably 0.8 or more, and even more preferably 1 or more, from the viewpoint of improving the abrasion resistance of the coating and suppressing stickiness. From the viewpoint of moisture retention, n is preferably 5 or less, more preferably 4 or less. The specific range of n is preferably 0.5 to 5, more preferably 0.8 to 4, and even more preferably 1 to 4.

[0052] As shown in general formula (I), (BO) n The units are attached to the terminal hydrogen atoms of the oxyalkylene derivatives.

[0053] An example of a commercially available oxyalkylene derivative represented by general formula (I) is "WILBRIDE S-753" (PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin) manufactured by NOF Corporation.

[0054] (Polyoxyalkylene alkyl glucoside (B6)) The polyoxyalkylene alkyl glucoside of component (B6) includes compounds in which alkylene oxide is added to an alkyl glucoside. From the viewpoint of improving the abrasion resistance and suppressing stickiness of the coating, the oxyalkylene is preferably an oxyalkylene having 2 or 3 carbon atoms, more preferably one or more selected from the group consisting of oxyethylene and oxypropylene, and even more preferably oxyethylene. The alkyl group in the alkyl glucoside is preferably an alkyl group having 1 to 3 carbon atoms, more preferably a methyl group, from the viewpoint of improving the abrasion resistance of the coating and suppressing stickiness. The average number of moles of alkylene oxide added is preferably 5 or more, more preferably 10 or more, and is preferably 30 or less, more preferably 20 or less, from the viewpoint of improving the abrasion resistance and suppressing stickiness of the coating. Examples of commercially available polyoxyalkylene alkyl glucosides include "Macbiobride MG-10E" (methyl gluceth-10), "Macbiobride MG-20E" (methyl gluceth-20), "Macbiobride MG-10P" (PPG-10 methyl glucose), and "Macbiobride MG-20P" (PPG-20 methyl glucose), all manufactured by NOF Corporation.

[0055] (Alkyl benzoate (B8)) The alkyl benzoate of component (B8) may be an alkyl ester of benzoic acid having from 12 to 15 carbon atoms, from the viewpoint of improving the abrasion resistance of the coating and suppressing stickiness. An example of a commercially available alkyl benzoate is "Finsorb TN" (C12-15 alkyl benzoate) manufactured by Innospec Active Chemicals LLC.

[0056] ((RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10)) Component (B10) is a compound also known as octocrylene, and examples of commercially available products include "Parsol 340" manufactured by DSM K.K.

[0057] (Methylphenylpolysiloxane (B11)) The methylphenylpolysiloxane of component (B11) is a compound also known as diphenylsiloxyphenyltrimethicone, and examples of commercially available products include "KF-56A" manufactured by Shin-Etsu Chemical Co., Ltd.

[0058] The component (B) can be used alone or in combination of two or more. Of the above, from the viewpoint of suppressing stickiness, component (B) is preferably one or more selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), the oxyalkylene derivative (B5) represented by the general formula (I) above, alkyl benzoate (B8), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and methylphenylpolysiloxane (B11), more preferably one or more selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), and (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and even more preferably one or more selected from the group consisting of phenoxyethanol (B1) and 2-ethylhexyl paramethoxycinnamate (B2).

[0059] From the viewpoint of improving the abrasion resistance of the coating, the content of component (B) in the topical preparation is preferably 0.1% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.5% by mass or more, even more preferably 0.8% by mass or more, and even more preferably 1.2% by mass or more. From the viewpoint of suppressing stickiness, the content is preferably 20% by mass or less, more preferably 12% by mass or less, even more preferably 8% by mass or less, even more preferably 5% by mass or less, and even more preferably 3% by mass or less. The specific range of the content of component (B) in the topical preparation is preferably 0.1 to 20% by mass, more preferably 0.3 to 12% by mass, even more preferably 0.5 to 8% by mass, even more preferably 0.5 to 5% by mass, even more preferably 0.8 to 5% by mass, and even more preferably 1.2 to 3% by mass.

[0060] The contents of components (A) and (B) in the topical preparation are preferably 0.1 to 5% by mass for component (A) and 0.1 to 20% by mass for component (B), more preferably 0.3 to 4% by mass for component (A) and 0.3 to 12% by mass for component (B), even more preferably 0.5 to 3.5% by mass for component (A) and 0.5 to 8% by mass for component (B), still more preferably 0.5 to 3.5% by mass for component (A) and 0.5 to 5% by mass for component (B), still more preferably 0.8 to 3% by mass for component (A) and 0.8 to 5% by mass for component (B), and even more preferably 1.2 to 2.5% by mass for component (A) and 1.2 to 3% by mass for component (B). The content ratio of component (A) to component (B) in the topical preparation can be selected appropriately depending on the types of component (A) and component (B). From the viewpoint of suppressing stickiness, the mass ratio is preferably 5:1 to 1:5, more preferably 4:1 to 1:4, and even more preferably 2:1 to 1:2.

[0061] [Aqueous medium] The topical preparation of the present invention may contain an aqueous medium, which may include water, lower alcohols such as ethanol and isopropyl alcohol, and low-molecular-weight diols and triols having 6 or less carbon atoms such as 1,3-butylene glycol, glycerin, ethylene glycol, and propylene glycol, and is preferably at least one selected from the group consisting of water and lower alcohols, more preferably at least one selected from the group consisting of water and ethanol, and more preferably contains at least water. The content of the aqueous medium in the topical preparation can be appropriately selected depending on the formulation of the topical preparation, but is usually in the range of 1 to 99.8% by mass. The content of the aqueous medium in the topical preparation may be the remainder of all active ingredients in the topical preparation.

[0062] [Other ingredients] In addition to the above-mentioned components, the topical preparation of the present invention may contain cosmetic ingredients or medicinal ingredients to be used depending on the intended use of the topical preparation, as well as ingredients commonly used in topical preparations such as skin cosmetics, as appropriate, within the scope of the present invention. Examples of such ingredients include antioxidants, ultraviolet absorbers, surfactants, thickeners, oils, pH adjusters, disinfectants, anti-inflammatory agents, preservatives, colorants, chelating agents, moisturizers, pearlizing agents, ceramides, fragrances, etc., other than component (B).

[0063] The method for producing the topical preparation of the present invention is not particularly limited. For example, it can be produced by blending component (A), component (B), and other components used as needed using the method described in the Examples, and mixing them using a known stirring device or the like.

[0064] In relation to the above-mentioned embodiments, the present invention further discloses the following compositions.

[0065] <1> An external preparation containing the following ingredients (A) and (B): Component (A): (a) one or more hydrophobic monomers selected from the group consisting of styrene and its derivatives, vinyl esters, and hydrophobic acrylic monomers; and (b) Ionic hydrophilic monomer or its salt and a structural unit derived from Ionic polymer particles having a mass ratio (a) / (b) of (a) to (b) of 99.5 / 0.5 to 80 / 20 and a glass transition temperature of more than 5°C and not more than 120°C. Ingredient (B): One or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative (B5) represented by the following general formula (I), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and a methylphenylpolysiloxane (B11). Z-{O(PO)l (EO) m -(BO) n H} a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1.

[0066] <2> The glass transition temperature (Tg) of component (A) is preferably 10°C or higher and 105°C or lower, more preferably 10°C or higher and 100°C or lower, even more preferably 15°C or higher and 100°C or lower, still more preferably 20°C or higher and 100°C or lower, still more preferably 30°C or higher and 95°C or lower, still more preferably 30°C or higher and 70°C or lower, still more preferably 30°C or higher and 50°C or lower, and still more preferably 30°C or higher and 45°C or lower. <1> The topical preparation described in 1.

[0067] <3> The hydrophobic acrylic monomer is a (meth)acrylic acid ester represented by the following general formula (1): <1> or <2> The topical preparation described in 1. [ka] In formula (1), R 1 represents a hydrogen atom or a methyl group, and R 2 represents a chain aliphatic group having 1 to 24 carbon atoms, a cyclic aliphatic group having 5 to 24 carbon atoms, an aryl group having 6 to 24 carbon atoms, or an aralkyl group having 7 to 24 carbon atoms, which may have a hydroxy group; R A represents an alkylene group having 2 to 4 carbon atoms, and n1 is an integer of 0 to 30.

[0068] <4> The ionic hydrophilic monomer or salt thereof (b) is at least one selected from the group consisting of acrylic acid, methacrylic acid, styrenesulfonic acid, and salts thereof; <1> ~ <3> 10. The topical preparation according to claim 1, wherein

[0069] <5> The hydrophobic monomer (a) contains the following monomer (a1) and monomer (a2): <1> ~ <4> 10. The topical preparation according to claim 1, wherein (a1) one or more selected from the group consisting of styrene, vinyl acetate, and (meth)acrylic acid esters having a glass transition temperature of a homopolymer higher than 5°C (a2) (Meth)acrylic acid ester having a homopolymer glass transition temperature of 5°C or less

[0070] <6> The difference in glass transition temperature between the homopolymer of monomer (a1) and the homopolymer of monomer (a2) is preferably 15°C or higher and 200°C or lower, more preferably 50°C or higher and 200°C or lower, even more preferably 50°C or higher and 180°C or lower, still more preferably 80°C or higher and 180°C or lower, still more preferably 100°C or higher and 180°C or lower, still more preferably 120°C or higher and 180°C or lower, and still more preferably 140°C or higher and 170°C or lower. <5> The topical preparation described in 1.

[0071] <7> The average particle size of component (A) is preferably 150 nm or more and 800 nm or less, more preferably 200 nm or more and 700 nm or less, even more preferably 300 nm or more and 600 nm or less, and even more preferably 300 nm or more and 550 nm or less. <1> ~ <6> 10. The topical preparation according to claim 1, wherein

[0072] <8> The mass ratio (a1) / (a2) of the monomer (a1) to the monomer (a2) is preferably 50 / 50 to 99 / 1, more preferably 50 / 50 to 90 / 10, even more preferably 54 / 46 to 85 / 15, still more preferably 54 / 46 to 80 / 20, still more preferably 60 / 40 to 80 / 20, and still more preferably 65 / 35 to 80 / 20. <5> ~ <7> 10. The topical preparation according to claim 1, wherein

[0073] <9> the total amount of the hydrophobic monomer (a) and the ionic hydrophilic monomer or a salt thereof (b) in all the monomers constituting the component (A) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, and still more preferably 98% by mass or more; <1> ~ <8> 10. The topical preparation according to claim 1, wherein

[0074] <10> the total amount of the monomer (a1) and the monomer (a2) in the hydrophobic monomer (a) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 80% by mass or more, and still more preferably 90% by mass or more; <5> ~ <9> 10. The topical preparation according to claim 1, wherein

[0075] <11> The content of component (A) is preferably 0.1 to 5 mass%, more preferably 0.3 to 4 mass%, even more preferably 0.5 to 3.5 mass%, still more preferably 0.8 to 3 mass%, and even more preferably 1.2 to 2.5 mass%. <1> ~ <10> 10. The topical preparation according to claim 1, wherein

[0076] <12> The component (B) is preferably one or more selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), the oxyalkylene derivative (B5) represented by the general formula (I), alkyl benzoate (B8), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and methylphenylpolysiloxane (B11), more preferably one or more selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), and (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and even more preferably one or more selected from the group consisting of phenoxyethanol (B1) and 2-ethylhexyl paramethoxycinnamate (B2). <1> ~ <11> 10. The topical preparation according to claim 1, wherein

[0077] <13> The content of component (B) is preferably 0.1 to 20 mass%, more preferably 0.3 to 12 mass%, even more preferably 0.5 to 8 mass%, still more preferably 0.5 to 5 mass%, even more preferably 0.8 to 5 mass%, and still more preferably 1.2 to 3 mass%. <1> ~ <12> 10. The topical preparation according to claim 1, wherein

[0078] <14> The contents of component (A) and component (B) in the topical preparation are preferably such that the content of component (A) is 0.1 to 5% by mass and the content of component (B) is 0.1 to 20% by mass, more preferably the content of component (A) is 0.3 to 4% by mass and the content of component (B) is 0.3 to 12% by mass, even more preferably the content of component (A) is 0.5 to 3.5% by mass and the content of component (B) is 0.5 to 8% by mass, still more preferably the content of component (A) is 0.5 to 3.5% by mass and the content of component (B) is 0.5 to 5% by mass, even more preferably the content of component (A) is 0.8 to 3% by mass and the content of component (B) is 0.8 to 5% by mass, and still more preferably the content of component (A) is 1.2 to 2.5% by mass and the content of component (B) is 1.2 to 3% by mass. <1> ~ <13> 10. The topical preparation according to claim 1, wherein

[0079] <15> The content ratio of component (A) to component (B) in the topical preparation is preferably 5:1 to 1:5 by mass, more preferably 4:1 to 1:4, and even more preferably 2:1 to 1:2. <1> ~ <14> 10. The topical preparation according to claim 1, wherein

[0080] <16> An external preparation containing the following ingredients (A) and (B): Component (A): (a) one or more hydrophobic monomers selected from the group consisting of styrene, vinyl acetate, and (meth)acrylic acid alkyl esters; and (b) one or more ionic hydrophilic monomers selected from the group consisting of acrylic acid and methacrylic acid, or salts thereof and a structural unit derived from Ionic polymer particles having a mass ratio (a) / (b) of (a) to (b) of 99 / 1 to 95 / 5 and a glass transition temperature of 10°C or higher and 105°C or lower. Ingredient (B): One or more compounds selected from the group consisting of phenoxyethanol (B1), 2-ethylhexyl paramethoxycinnamate (B2), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative (B5) represented by the following general formula (I), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and a methylphenylpolysiloxane (B11). Z-{O(PO)l(EO)m-(BO)nH}a (I) In the formula, Z represents a residue obtained by removing a hydroxyl group from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the mass ratio (PO / EO) being in the range of 1 / 5 to 5 / 1.

[0081] <17> The content of component (A) is 0.3 to 4 mass%. <16> The topical preparation described in 1.

[0082] <18> The content of component (B) is 0.3 to 12 mass%. <16> or <17> The topical preparation described in 1.

[0083] <19> The content of component (A) is 0.3 to 4 mass% and the content of component (B) is 0.3 to 12 mass%. <16> ~ <18> 10. The topical preparation according to claim 1, wherein

[0084] <20> The content ratio of component (A) to component (B) in the topical preparation is 5:1 to 1:5 by mass. <16> ~ <19> 10. The topical preparation according to claim 1, wherein [Example]

[0085] The present invention will be described below with reference to examples, but the present invention is not limited to the scope of the examples. In the examples, various measurements and evaluations were carried out by the following methods.

[0086] (glass transition temperature (Tg)) The glass transition temperature of the polymer particles was calculated from the following formula (1) using the Tg value of the homopolymer of each monomer used in the examples.

number

[0087] The Tg of the homopolymer of each monomer used in the examples is as follows: Polymethyl methacrylate: 105°C Polystyrene: 100℃ Polyvinyl acetate: 32°C Polyn-butyl acrylate: -54°C Polyacrylic acid: 106℃

[0088] (Average particle size of polymer particles) The average particle size (median diameter: D50) of the polymer particles was measured at 25°C using a laser diffraction / scattering particle size distribution analyzer "LA-920" manufactured by Horiba, Ltd., with water as the dispersion medium and a relative refractive index of 1.200-0.000i.

[0089] (sticky) Five expert panelists applied 20 μL of each topical preparation to a 5 cm diameter circle on the inside of their forearms and spread it over 20 seconds at 25°C and 57% RH. The feel (stickiness) after use was then evaluated according to the following evaluation criteria, and the average score of the five panelists was calculated. 5: No stickiness at all 4: No sticky feeling 3: Feels slightly sticky 2: Feeling sticky 1: Very sticky

[0090] (wear resistance) 100 μL of the topical preparation obtained in each example was applied to a 3 cm × 10 cm glass plate and dried at 25 ° C for 60 minutes to form a film. 2 The artificial leather with a weight on it exerting a pressure of 100 mm / sec was placed on the glass plate and pulled parallel to the glass plate surface at a speed of 100 mm / sec. If the film was not broken, it was evaluated as "good", and if it was broken, it was evaluated as "bad".

[0091] Production Example 1 (Production of Dispersion of Polymer Particles 1) 510 g of ion-exchanged water was placed in a 1 L glass separable flask and stirred under a nitrogen atmosphere for 30 minutes. The flask was heated to approximately 70°C. After the system reached 70°C, a solution of 1.5 g of ammonium persulfate dissolved in 15 g of ion-exchanged water was added. Next, a monomer solution consisting of 204 g of methyl methacrylate, 87 g of n-butyl acrylate, and 9 g of acrylic acid was added dropwise to the system at a constant rate over a period of 3 hours. After the addition was complete, the system was maintained at approximately 70°C for 1 hour, then heated to approximately 75°C and maintained there for 3 hours to allow polymerization and aging. The resulting reaction solution was cooled and neutralized by adding 43.7 g of 1N aqueous sodium hydroxide solution. Further, aggregates were removed using a 200 mesh filter to obtain a dispersion of polymer particles 1 with a solids content of 35% by mass. The glass transition temperature of polymer particles 1 was 39°C and the average particle size was 450 nm.

[0092] Production Examples 2 and 3 (Production of Dispersions of Polymer Particles 2 and 3) A dispersion of polymer particles 2 and 3 was produced in the same manner as in Production Example 1, except that the total amount of 291 g of methyl methacrylate and n-butyl acrylate was changed to the monomer composition (mass ratio) shown in Table 1. The glass transition temperatures and average particle sizes of polymer particles 2 and 3 are shown in Table 1.

[0093] Production Example 4 (Production of Dispersion of Polymer Particles 6) 510 g of ion-exchanged water was placed in a 1 L glass separable flask and stirred under a nitrogen atmosphere for 30 minutes. The flask was heated to approximately 70°C. After the system reached 70°C, a solution of 1.5 g of ammonium persulfate dissolved in 15 g of ion-exchanged water was added. Next, a monomer solution consisting of 285 g of styrene, 6 g of n-butyl acrylate, and 9 g of acrylic acid was added dropwise to the system at a constant rate over a period of 3 hours. After the addition was complete, the system was maintained at approximately 70°C for 1 hour, then heated to approximately 75°C and maintained there for 3 hours to allow polymerization and aging. The resulting reaction solution was cooled and neutralized by adding 43.7 g of 1N aqueous sodium hydroxide solution. Further, aggregates were removed using a 200 mesh filter to obtain a dispersion of polymer particles 6 with a solids content of 35% by mass. The glass transition temperature and average particle size of polymer particles 6 are shown in Table 1.

[0094] Production Example 5 (Production of Dispersion of Polymer Particles 7) 510 g of ion-exchanged water was placed in a 1 L glass separable flask and stirred under a nitrogen atmosphere for 30 minutes. The flask was heated to approximately 70°C. After the system reached 70°C, a solution of 1.5 g of ammonium persulfate dissolved in 15 g of ion-exchanged water was added. Next, a monomer solution consisting of 225 g of vinyl acetate, 66 g of n-butyl acrylate, and 9 g of acrylic acid was added dropwise to the system at a constant rate over a period of 3 hours. After the addition was complete, the system was maintained at approximately 70°C for 1 hour, then heated to approximately 75°C and maintained there for 3 hours to allow polymerization and aging. The resulting reaction solution was cooled and neutralized by adding 43.7 g of 1N aqueous sodium hydroxide solution. Further, aggregates were removed using a 200 mesh filter to obtain a dispersion of polymer particles 7 with a solids content of 35% by mass. The glass transition temperature and average particle size of polymer particles 7 are shown in Table 1.

[0095] Production Example 6 (Production of Dispersion of Polymer Particles 8) A dispersion of polymer particles 8 was obtained in the same manner as in Production Example 4, except that the total amount of styrene and n-butyl acrylate (291 g) was changed to the monomer composition (mass ratio) shown in Table 1. The glass transition temperature and average particle size of polymer particles 8 are shown in Table 1.

[0096] Comparative Production Examples 1 and 2 (Production of Dispersions of Polymer Particles 4 and 5) Dispersions of polymer particles 4 and 5 for comparative examples were produced in the same manner as in Production Example 1, except that the total amount of 291 g of methyl methacrylate and n-butyl acrylate was changed to the monomer composition (mass ratio) shown in Table 1. The glass transition temperatures and average particle sizes of the polymer particles are shown in Table 1.

[0097] [Table 1]

[0098] Examples 1 to 25 and Comparative Examples 1 to 18 (Production and Evaluation of Topical Preparations) The components shown in Table 2 were mixed to obtain an oil-in-water topical preparation for each example. The blending amounts shown in Table 2 are the active ingredient amounts (mass%) of each component. Using the obtained topical preparations, stickiness and abrasion resistance were evaluated using the methods described above. The results are shown in Table 2. In addition, Comparative Examples 5 to 18 were not evaluated for stickiness because they had poor abrasion resistance.

[0099] [Table 2]

[0100] The ingredients in Table 2 are as follows: *1 2-Ethylhexyl paramethoxycinnamate: Uvinal MC80 (BASF SE) *2 Oxyalkylene derivative represented by formula (I) (PEG / PPG / polybutylene glycol-8 / 5 / 3 glycerin): WILBRIDE S-753 (NOF Corporation) *3 Polyoxyalkylene alkyl glucoside (methyl gluceth-20): Macbiobride MG-20E (NOF Corporation) *4 Alkyl benzoate (C12-15): Finsorb TN (manufactured by Innospec Active Chemicals LLC) *5 Octocrylene: Parsol 340 (manufactured by DSM Co., Ltd.) *6 Methylphenylpolysiloxane: KF-56A (Shin-Etsu Chemical Co., Ltd.) *7 Polyethylene glycol: PEG-1540 (Sanyo Chemical Industries, Ltd.) *8 Dimethylpolysiloxane: Silicone KF-96L-2CS (Shin-Etsu Chemical Co., Ltd.) *9 Hydrogenated polyisobutene: Pearleem 4 (NOF Corporation) *10 Olive oil: Cropure OL (manufactured by Croda Japan Co., Ltd.) *11 Isopropyl palmitate: Exepar IPP (Kao Corporation) *12 Neopentyl glycol dicaprate: Estemol N-01 (manufactured by Nisshin Oillio Group Co., Ltd.) *13 Isononyl isononanoate: Salacos 99 (manufactured by Nisshin Oillio Group Co., Ltd.) *14 Isopropyl myristate: Exepar IPM (Kao Corporation) *15 Caprylyl methicone: SS-3408 (manufactured by Toray Dow Corning Co., Ltd.) *16 Triethylhexanoin: TIO (manufactured by Nisshin Oillio Group Co., Ltd.)

[0101] Table 2 shows that the topical agent of the present invention containing the specified components (A) and (B) has good abrasion resistance and excellent film-forming ability, and the resulting film is also less sticky. [Industrial Applicability]

[0102] The topical preparation of the present invention is useful, for example, as a skin cosmetic, because it is less sticky, has an excellent feel when used, has a high film-forming ability, and is highly abrasion-resistant.

Claims

1. An external preparation for skin cosmetics containing the following components (A) and (B): Component (A): (a) a hydrophobic monomer, and (b) acrylic acid or a salt thereof and a structural unit derived from The hydrophobic monomer (a) contains the following monomer (a1) and monomer (a2): (a1) One or more selected from the group consisting of styrene, vinyl acetate, methyl acrylate, tert-butyl acrylate, isobornyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isobornyl methacrylate, and 2-hydroxyethyl methacrylate. (a2) one or more selected from the group consisting of ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, and lauryl methacrylate the total amount of the hydrophobic monomer (a) and the acrylic acid or a salt thereof (b) in all the monomers constituting the component (A) is 80 mass% or more, the mass ratio (a1) / (a2) of (a1) to (a2) is 50 / 50 to 99 / 1; Ionic polymer particles produced by a soap-free emulsion polymerization method, in which the mass ratio (a) / (b) of (a) to (b) is 99 / 1 to 90 / 10, the glass transition temperature is 20°C or higher and 100°C or lower, and the average particle size is 150 nm or higher and 800 nm or lower. Ingredient (B): One or more compounds selected from the group consisting of phenoxyethanol (B1), benzyl alcohol (B3), sorbitol (B4), an oxyalkylene derivative represented by the following general formula (I) (B5), a polyoxyalkylene alkyl glucoside (B6), oleic acid (B7), an alkyl benzoate (B8), xylitol (B9), (RS)-2-cyano-3,3-diphenylprop-2-enoic acid-2-ethylhexyl ester (B10), and methylphenylpolysiloxane (B11): Z-{O(2O) ｌ (EO) ｍ -(BO) ｎ }} ａ (I) In the formula, Z represents a residue obtained by removing a hydroxyl groups from a compound containing 3 to 9 hydroxyl groups, PO represents an oxypropylene group, EO represents an oxyethylene group, and BO represents an oxyalkylene group having 4 carbon atoms. a is in the range of 3 to 9. l, m, and n represent the average number of moles of PO, EO, and BO units added, respectively, where l is 0.5 to 10, m is 1 to 20, and n is 0.5 to 5, with the proviso that the mass ratio (PO / EO) is in the range of 1 / 5 to 5 / 1, The content of component (A) is 0.1% by mass or more and 5% by mass or less, and the content of component (B) is 0.1% by mass or more and 12% by mass or less.

2. 2. The external skin cosmetic preparation according to claim 1, wherein the monomer (a1) is at least one selected from the group consisting of styrene, vinyl acetate, and methyl methacrylate, and the monomer (a2) is n-butyl acrylate.

3. The external skin cosmetic preparation according to claim 1 or 2, wherein the total amount of the monomer (a1) and the monomer (a2) in the hydrophobic monomer (a) is 80% by mass or more.

4. The external skin cosmetic preparation according to any one of claims 1 to 3, wherein the content ratio of component (A) to component (B) is 5:1 to 1:5 by mass.

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