Coloration inhibitor for ultraviolet absorbent

Abstract

To provide an agent capable of preventing the coloration of ultraviolet absorbents caused by chlorine-based bleaching agents.SOLUTION: Provided is a coloration inhibitor for ultraviolet absorbents, the inhibitor comprising a polycarboxylic acid polymer (α) including a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B).SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a coloration inhibitor for an ultraviolet absorbent, and more particularly to a coloration inhibitor for an ultraviolet absorbent that is suitable for use in cosmetics such as sunscreens. [Background technology]

[0002] Conventionally, various sunscreen cosmetics have been developed to protect the skin from the adverse effects of ultraviolet rays. The ultraviolet protection agents blended into sunscreen cosmetics include inorganic ultraviolet scattering agents such as zinc oxide and titanium oxide, and organic ultraviolet absorbing agents such as 2-ethylhexyl paramethoxycinnamate (for example, Patent Document 1 and Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-120365 A [Patent Document 2] JP 2015-017080 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, there has been an issue that when clothes with cosmetics containing ultraviolet absorbing agents on them are washed using chlorine bleach, the clothes turn pink.

[0005] The present invention has been made in consideration of the above-mentioned current situation, and an object of the present invention is to provide an agent capable of suppressing discoloration of an ultraviolet absorbent caused by a chlorine-based bleaching agent. [Means for solving the problem]

[0006] The present inventors have conducted extensive research into compounds capable of suppressing discoloration of ultraviolet absorbers, and have found that a polycarboxylic acid polymer having a structural unit derived from an unsaturated monocarboxylic acid monomer and a structural unit derived from an unsaturated dicarboxylic acid monomer (B), and a polyalkyleneimine polymer having a structural unit derived from an alkyleneimine, are capable of suppressing discoloration of ultraviolet absorbers caused by chlorine bleaches. They have thus come to the realization that the above-mentioned problems can be solved in an excellent manner, and have arrived at the present invention.

[0007] The present invention includes the following coloration inhibitors for ultraviolet absorbents, etc. [1] A coloration inhibitor for an ultraviolet absorber, comprising a polycarboxylic acid polymer (α) having a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B). [2] The coloring inhibitor for an ultraviolet absorber according to the above [1], wherein the polycarboxylic acid polymer (α) has a content of the structural unit (b) of 15 to 80 mol % relative to 100 mol % of all structural units. [3] A coloration inhibitor for an ultraviolet absorber, comprising a polyalkyleneimine polymer (β) having a structural unit (c) derived from an alkyleneimine. [4] The coloring inhibitor for an ultraviolet absorber according to the above-mentioned [3], wherein the polyalkyleneimine polymer (β) is a polyalkyleneimine or a polyalkyleneimine derivative having a structural unit (c) derived from an alkyleneimine and a structural unit (d) derived from an alkylene oxide. [5] A cosmetic preparation comprising an ultraviolet absorbent coloring inhibitor according to any one of [1] to [4] above and an ultraviolet absorbent. Effect of the Invention

[0008] The coloration inhibitor for an ultraviolet absorbent of the present invention has the above-mentioned constitution and can inhibit the coloration of an ultraviolet absorbent caused by a chlorine bleach, and therefore can be suitably used in cosmetics and the like. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The preferred embodiments of the present invention are specifically described below, but the present invention is not limited to the following description, and can be modified as appropriate within the scope of the present invention. In addition, a combination of two or more of the individual preferred embodiments of the present invention described below also falls within the preferred embodiments of the present invention.

[0010] [Coloration inhibitor for ultraviolet absorbers] The first coloration inhibitor for an ultraviolet absorber of the present invention contains a polycarboxylic acid polymer (α) having a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B). The coloring inhibitor for an ultraviolet absorbent according to the second aspect of the present invention contains a polyalkyleneimine polymer (β) having a structural unit (c) derived from an alkyleneimine. In this specification, when the term "the present invention" is used simply, it refers to matters common to the first and second inventions.

[0011] <Polycarboxylic acid polymer (α)> The first coloration inhibitor for ultraviolet absorbers of the present invention is presumably such that the polycarboxylic acid polymer (α) has a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B), resulting in a sufficient amount of carboxyl groups or salt groups thereof in the polymer, which satisfactorily inhibits the reaction of chlorine bleach with the ultraviolet absorber and thus inhibits coloration.

[0012] The polycarboxylic acid polymer (α) is not particularly limited as long as it has a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B), but the content of the structural unit (a) is preferably 5 to 95 mol % relative to 100 mol % of all structural units, more preferably 10 to 90 mol %, even more preferably 20 to 85 mol %, particularly preferably 30 to 80 mol %, and most preferably 40 to 75 mol %. The content of the structural unit (a) is preferably 5 to 95 mass% relative to 100 mass% of all structural units, more preferably 10 to 90 mass%, further preferably 20 to 85 mass%, particularly preferably 30 to 80 mass%, and most preferably 35 to 75 mass%. The mass proportion of the structural unit (a) is calculated in terms of sodium salt. Calculation in terms of sodium salt means that even if the carboxyl group of the structural unit (a) is in an acid form, it is calculated as the sodium salt of the carboxyl group. The mass proportion of the following structural unit (b) is also calculated in terms of sodium salt.

[0013] The polycarboxylic acid polymer (α) preferably has a content of the structural unit (b) of 5 to 90 mol % relative to 100 mol % of all structural units. This allows the amount of carboxyl groups or salt groups in the polycarboxylic acid polymer (α) to be more sufficient, and the effects of the present invention can be more fully exhibited. The content of the structural unit (b) is more preferably 10 to 85 mol %, even more preferably 15 to 80 mol %, particularly preferably 20 to 70 mol %, and most preferably 25 to 60 mol %. The content of the structural unit (b) is preferably 5 to 90 mass% relative to 100 mass% of all structural units, more preferably 10 to 85 mass%, further preferably 15 to 80 mass%, particularly preferably 20 to 70 mass%, and most preferably 25 to 65 mass%.

[0014] The polycarboxylic acid polymer (α) may have a structural unit (e1) derived from a monomer (E1) other than the unsaturated monocarboxylic acid monomer (A) and the unsaturated dicarboxylic acid monomer (B). The content of the structural unit (e1) is preferably 0 to 10 mol % relative to 100 mol % of all structural units, more preferably 0 to 5 mol %, even more preferably 0 to 1 mol %, particularly preferably 0 to 0.1 mol %, and most preferably 0 mol %. The content of the structural unit (e1) is preferably 0 to 10 mass% relative to 100 mass% of all structural units, more preferably 0 to 5 mass%, even more preferably 0 to 1 mass%, particularly preferably 0 to 0.1 mass%, and most preferably 0 mass%.

[0015] The weight average molecular weight of the polycarboxylic acid polymer (α) is not particularly limited, but is preferably from 2,000 to 100,000, which allows the effects of the present invention to be exhibited more sufficiently. The weight average molecular weight is more preferably 3,000 to 80,000, further preferably 3,000 to 50,000, even more preferably 4,000 to 20,000, and particularly preferably 4,000 to 10,000. The weight average molecular weight of the polycarboxylic acid polymer (α) can be measured by gel permeation chromatography (GPC).

[0016] The unsaturated monocarboxylic acid monomer (A) may be any monomer having one each of an ethylenically unsaturated hydrocarbon group and a carboxyl group or a salt thereof, and examples thereof include (meth)acrylic acid, crotonic acid, tiglic acid, 3-methylcrotonic acid, 2-methyl-2-pentenoic acid, etc.; monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts thereof; and half esters of the unsaturated dicarboxylic acid monomer (B) described below and alcohols having 1 to 20 carbon atoms. The unsaturated monocarboxylic acid monomer (A) is preferably (meth)acrylic acid or a salt thereof. That is, one of the preferred embodiments of the present invention is one in which the unsaturated monocarboxylic acid monomer (A) is (meth)acrylic acid (salt).

[0017] The alcohol having 1 to 20 carbon atoms is not particularly limited, and examples thereof include aliphatic alcohols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, and octanol; and alicyclic alcohols such as cyclohexanol.

[0018] The unsaturated dicarboxylic acid monomer (B) may be any monomer having one ethylenically unsaturated hydrocarbon group and two carboxyl groups or salt groups thereof in the molecule, and examples thereof include maleic acid, itaconic acid, mesaconic acid, citraconic acid, fumaric acid, and the like, as well as their monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts, and their anhydrides. The unsaturated dicarboxylic acid monomer (B) is preferably maleic acid and its salts, or maleic anhydride. That is, the embodiment in which the unsaturated monocarboxylic acid monomer (B) is maleic acid (salt) and / or maleic anhydride is one of the preferred embodiments of the present invention.

[0019] In the polycarboxylic acid polymer (α), the unsaturated monocarboxylic acid monomer (A) and the unsaturated monocarboxylic acid monomer (B) are in the form of a salt, which is one of the preferred embodiments of the present invention. Examples of the salt include monovalent metal salts such as alkali metals such as sodium and potassium, divalent metal salts such as alkaline earth metals such as magnesium and calcium, ammonium salts, organic amine salts, etc. Among these, preferred are monovalent metal salts, and more preferred are sodium salts.

[0020] The polycarboxylic acid polymer (α) may have a structural unit (e1) derived from another monomer (E1) other than the unsaturated monocarboxylic acid monomer (A) and the unsaturated monocarboxylic acid monomer (B). The other monomer (E1) is not particularly limited as long as it can be copolymerized with the unsaturated monocarboxylic acid monomer (A) and the unsaturated monocarboxylic acid monomer (B). Examples of the other monomer (E1) include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxypropyl (meth)acrylate, 5-hydroxypropyl (meth)acrylate, 6-hydroxypropyl (meth)acrylate, 7-hydroxypropyl (meth)acrylate, 8-hydroxypropyl (meth)acrylate, 9-hydroxypropyl (meth)acrylate, 10-hydroxypropyl (meth)acrylate, 11-hydroxypropyl (meth)acrylate, 12-hydroxypropyl (meth)acrylate, 13-hydroxypropyl (meth)acrylate, 14-hydroxypropyl (meth)acrylate, 15-hydroxypropyl (meth)acrylate, 16-hydroxypropyl (meth)acrylate, 17-hydroxypropyl (meth)acrylate, 18-hydroxypropyl (meth)acrylate, 19-hydroxypropyl (meth)acrylate, 20-hydroxypropyl (meth)acrylate, 21-hydroxypropyl (meth)acrylate, 22-hydroxypropyl (meth)acrylate, 23-hydroxypropyl (meth)acrylate, 24-hydroxypropyl (meth)acrylate, 25-hydroxypropyl (meth)acrylate, 26-hydroxypropyl (meth)acrylate, 27-hydroxypropyl (meth)acrylate, 28-hydroxypropyl (meth)acrylate, 29-hydroxypropyl (meth)acrylate, 30-hydroxypropyl (meth)acrylate, 31-hydroxypropyl (meth)acrylate, 32-hydroxypropyl (meth)acrylate, 33-hydroxypropyl (meth)acrylate, 34-hydroxypropyl (meth)acrylate, 35-hydroxypropyl (meth)acrylate, 36-hydroxypropyl (meth)acrylate, 37-hydroxypropyl ( hydroxyl group-containing alkyl (meth)acrylates such as hydroxybutyl (meth)acrylate and α-hydroxymethylethyl (meth)acrylate; alkyl (meth)acrylates which are esters of alkyl groups having 1 to 18 carbon atoms of (meth)acrylic acid such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and lauryl (meth)acrylate; amino group-containing acrylates such as dimethylaminoethyl (meth)acrylate and its quaternary derivatives; (meth)acrylamide, dimethylacrylamide, isopropylacrylamide, butyl (meth)acrylate, cyclohexyl (meth)acrylate, and lauryl (meth)acrylate; amide group-containing monomers such as isopropylacrylamide; vinyl esters such as vinyl acetate; alkenes such as ethylene and propylene; aromatic vinyl monomers such as styrene; maleimide derivatives such as maleimide, phenylmaleimide, and cyclohexylmaleimide; nitrile group-containing vinyl monomers such as (meth)acrylonitrile; 3-(meth)allyloxy-2-hydroxypropanesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-((meth)acryloyloxy)ethanesulfonic acid, p-styrenesulfonic acid, α-methyl-p-styrenesulfonic acid, Monomers having a sulfonic acid group, such as toluenesulfonic acid, vinylsulfonic acid, (meth)allylsulfonic acid, isoprene sulfonic acid, 1-methyl-2-propene-1-sulfonic acid, 1,1-dimethyl-2-propene-1-sulfonic acid, 3-butene-1-sulfonic acid, and 1-butene-3-sulfonic acid, and their salts; monomers having a phosphonic acid group, such as vinylphosphonic acid and (meth)allylphosphonic acid; aldehyde group-containing vinyl monomers, such as (meth)acrolein; alkyl vinyl ethers, such as methyl vinyl ether, ethyl vinyl ether, and butyl vinyl ether;Other functional group-containing monomers such as vinyl chloride, vinylidene chloride, allyl alcohol, vinylpyrrolidone, etc.; polyalkylene glycol chain-containing monomers such as polyalkylene glycol (meth)acrylate, monoalkoxy polyalkylene glycol (meth)acrylate, vinyl alcohol, (meth)allyl alcohol, isoprenol, etc., having a structure in which 1 to 300 moles of alkylene oxide are added to (meth)acrylic acid or unsaturated alcohol; etc. With regard to these other monomers, only one type may be used alone, or two or more types may be used in combination.;

[0021] The method for producing the polycarboxylic acid polymer (α) is not particularly limited, but it can be obtained by polymerizing a monomer component containing an unsaturated monocarboxylic acid monomer (A) and an unsaturated dicarboxylic acid monomer (B) by a commonly used method. In addition, a commercially available product can be used as the polycarboxylic acid polymer (α).

[0022] <Polyalkyleneimine polymer (β)> The coloring inhibitor for an ultraviolet absorbent of the second present invention contains a polyalkyleneimine polymer (β) having a structural unit (c) derived from an alkyleneimine. It is presumed that the polyalkyleneimine polymer (β) has the structural unit (c) derived from alkyleneimine, which sufficiently inhibits the reaction of chlorine bleach with the ultraviolet absorber, thereby suppressing discoloration.

[0023] The structural unit (c) derived from an alkyleneimine is a structural unit formed by polymerization of an alkyleneimine, and is, for example, a structural unit represented by the following formula (1);

[0024] [ka]

[0025] (In the formula, R 1represents an alkylene group having 2 to 10 carbon atoms which may have a substituent. An asterisk represents an atom contained in another structural unit or group of the same or different type to which the structural unit (c) derived from an alkyleneimine is bonded. 1 This is the part represented by -N.

[0026] The alkylene group having 2 to 10 carbon atoms is preferably an alkylene group having 2 to 6 carbon atoms such as an ethylene group, a propylene group, a butylene group, or a dimethylethylene group, more preferably an ethylene group or a propylene group, and even more preferably an ethylene group. The substituent is not particularly limited, but examples thereof include an alkoxy group, an acetoxy group, and an ester group.

[0027] The nitrogen atom in the structural unit (c) derived from the alkyleneimine may be a nitrogen atom of a primary to tertiary amine, may be neutralized, may be quaternized, or may be in the form of an N-oxide. The N-oxide form and the quaternized form are, for example, represented by the following formula (1-2) or (1-3), respectively;

[0028] [ka]

[0029] (In the formula, R 1 R represents an alkylene group having 2 to 10 carbon atoms which may have a substituent. 2 represents a hydrocarbon group having 1 to 10 carbon atoms. - represents a counter anion. The asterisk represents an atom contained in another structural unit or group of the same or different type to which the structural unit (c) derived from an alkyleneimine is bonded.

[0030] The polyalkyleneimine polymer (β) is not particularly limited as long as it has a structural unit (c) derived from an alkyleneimine, and may further have a structural unit (d) derived from an alkylene oxide. The structural unit (d) derived from an alkylene oxide is a structural unit formed by addition of an alkylene oxide, and is represented by the following formula (2);

[0031] [ka]

[0032] (In the formula, R 3 represents an alkylene group having 2 to 10 carbon atoms which may have a substituent. The asterisk represents an element or group bonded to the structural unit (d) derived from an alkylene oxide. R 3 The oxyalkylene group represented by O is an alkylene oxide adduct, and examples of such alkylene oxides include alkylene oxides having 2 to 8 carbon atoms, such as ethylene oxide, propylene oxide, butylene oxide, isobutylene oxide, 1-butene oxide, 2-butene oxide, and styrene oxide. One or more of these can be used. Among these, alkylene oxides having 2 to 4 carbon atoms, such as ethylene oxide, propylene oxide, and butylene oxide, are preferred, and ethylene oxide and propylene oxide are more preferred.

[0033] When the polyalkyleneimine polymer (β) has a structural unit (d) derived from an alkylene oxide, the average number of moles of oxyalkylene groups added per mole of active hydrogen -NH of the alkylimine is not particularly limited, but is preferably 1 to 100, more preferably 2 to 75, and even more preferably 5 to 40. The average number of moles added is the average number of moles of oxyalkylene groups added per mole of active hydrogen units of the alkyleneimine.

[0034] The polyalkyleneimine polymer (β) may have a structural unit other than the structural unit (c) derived from an alkyleneimine and the structural unit (d) derived from an alkylene oxide (hereinafter also referred to as "other structural unit (e2)"). The other structural unit (e2) is not particularly limited, but may include a hydrogen atom; a residue derived from an initiator such as an amino group; a bonding group such as an ester group, a thioester group, an amide group, a thioamide group, an acetal group, a hemiacetal group, or a hemiketal group; a residue of a compound capable of reacting with a hydroxyl group, such as an acid anhydride, an isocyanate, or an ester compound; and the like. The linking group may, for example, link a structural unit (c) derived from a polyalkyleneimine with a structural unit (d) derived from an alkylene oxide.

[0035] An embodiment in which the polyalkyleneimine polymer (β) is a polyalkyleneimine or a polyalkyleneimine derivative having a structural unit (c) derived from an alkyleneimine and a structural unit (d) derived from an alkylene oxide is one of the preferred embodiments of the second present invention.

[0036] The polyalkyleneimine is preferably a homopolymer or copolymer of these alkyleneimines obtained by polymerizing one or more of alkyleneimines having 2 to 6 carbon atoms, such as ethyleneimine, propyleneimine, 1,2-butyleneimine, 2,3-butyleneimine, and 1,1-dimethylethyleneimine, by a conventional method. These may be used alone or in combination of two or more. More preferably, it is a homopolymer of ethyleneimine (polyethyleneimine; PEI). It may also be one obtained by polymerizing ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, or the like.

[0037] When the polyalkyleneimine polymer (β) is a polyalkyleneimine derivative having a structural unit (c) derived from an alkyleneimine and a structural unit (d) derived from an alkylene oxide, the molar ratio of the structural unit (c) derived from an alkyleneimine to the structural unit (d) derived from an alkylene oxide is preferably 1:0.1 to 1:100, more preferably 1:0.3 to 1:80, even more preferably 1:0.5 to 1:50, still more preferably 1:0.5 to 1:30, even more preferably 1:0.5 to 1:10, even more preferably 1:0.5 to 1:5, and particularly preferably 1:0.5 to 1:3.

[0038] The weight average molecular weight of the polyalkyleneimine polymer (β) is not particularly limited, but is preferably from 1,000 to 500,000, which allows the effects of the present invention to be exhibited more sufficiently. The weight average molecular weight is more preferably from 10,000 to 450,000, further preferably from 20,000 to 400,000, and particularly preferably from 50,000 to 350,000. The weight average molecular weight of the polyalkyleneimine polymer (β) can be measured by gel permeation chromatography (GPC). In the present invention, the following conditions are adopted as the GPC measurement conditions. Measuring equipment: Shimadzu Corporation Eluent: 0.5M acetic acid, 0.5M sodium nitrate aqueous solution Flow rate: 0.5mL / min Sample: 0.5wt%, 100μL Temperature: 40℃ Column: Showa Denko Co., Ltd. Shodex Ohpak (SB-806M HQ x 2 + SB-807HQ x 2) Detector: IR detector (RI) Standard: Pullulan + sugars (relative molecular weight)

[0039] The number average molecular weight of the polyalkyleneimine polymer (β) is not particularly limited, but is preferably 1,000 to 100,000, more preferably 2,000 to 100,000, further preferably 3,000 to 50,000, and particularly preferably 5,000 to 20,000. The number average molecular weight of the polyalkyleneimine polymer (β) can be measured by gel permeation chromatography (GPC) under the same conditions as described above.

[0040] The method for producing the polyalkyleneimine polymer (β) is not particularly limited, but it can be obtained by polymerizing a monomer component containing an alkyleneimine by a commonly used method. In addition, when the polyalkyleneimine polymer (β) has a structural unit (d) derived from an alkylene oxide, it can be produced by polymerizing a monomer component containing an alkyleneimine and then adding an alkylene oxide. As the polyalkyleneimine polymer (β), a commercially available product can also be used.

[0041] [Cosmetics] The present invention also relates to a cosmetic comprising an ultraviolet absorbent and a coloring inhibitor for the ultraviolet absorbent of the present invention (hereinafter, also simply referred to as a coloring inhibitor). In this specification, the term "cosmetics" also includes quasi-drugs.

[0042] The content of the coloring inhibitor in the cosmetic is not particularly limited, but is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, even more preferably 0.1 to 2.5% by mass, and particularly preferably 0.2 to 2.0% by mass, relative to 100% by mass of the cosmetic. The content of the coloring inhibitor is preferably 0.1 to 20% by mass, more preferably 0.2 to 15% by mass, still more preferably 0.5 to 15% by mass, and particularly preferably 0.5 to 10% by mass, relative to 100% by mass of the ultraviolet absorber. In one embodiment, the content of the coloring inhibitor may be 0.1 to 55% by mass, preferably 0.2 to 50% by mass, and more preferably 0.5 to 25% by mass, relative to 100% by mass of the ultraviolet absorber.

[0043] The ultraviolet absorber contained in the cosmetic composition of the present invention is not particularly limited, but examples thereof include benzoic acid derivatives, triazine derivatives, dibenzoylmethane derivatives, benzophenone derivatives, cinnamic acid derivatives, salicylic acid derivatives, β,β-diphenylacrylate derivatives, benzylidene camphor derivatives, phenylbenzimidazole derivatives, phenylbenzotriazole derivatives, anthranil derivatives, imidazoline derivatives, benzalmalonate derivatives, 4,4-diarylbutadiene derivatives, and silicone derivatives.

[0044] Benzoic acid derivatives include diethylaminohydroxybenzoylhexyl benzoate, ethyl p-aminobenzoate (PABA), ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA, PEG-25-PABA, etc. Among these, diethylaminohydroxybenzoylhexyl benzoate is preferred.

[0045] Examples of the triazine derivative include bisethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylhexylbutamido triazone, 2,4,6-tris(diisobutyl-4'-aminobenzalmalonate)-s-triazine, etc. Among them, bisethylhexyloxyphenol methoxyphenyl triazine is preferred.

[0046] The dibenzoylmethane derivatives include t-butyl methoxydibenzoylmethane (4-tert-butyl-4'-methoxydibenzoylmethane).

[0047] Examples of the benzophenone derivative include benzophenone-1, benzophenone-2, benzophenone-3, oxybenzone-4, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9, benzophenone-12, etc. Among these, oxybenzone-4 is preferred.

[0048] Examples of cinnamic acid derivatives include ethylhexyl methoxycinnamate, isopropyl methoxycinnamate, isoamyl methoxycinnamate, cinoxate, DEA methoxycinnamate, diisopropyl methylcinnamate, glyceryl-ethylhexanoate-dimethoxycinnamate, and di-(2-ethylhexyl)-4'-methoxybenzalmalonate.

[0049] Salicylic acid derivatives include ethylhexyl salicylate (octyl salicylate), homosalate, dipropylene glycol salicylate, TEA salicylate, and the like. Examples of β,β-diphenylacrylate derivatives include octocrylene.

[0050] Examples of benzylidene camphor derivatives include 3-benzylidene camphor, 4-methylbenzylidene camphor, benzylidene camphorsulfonic acid, benzalkonium camphor methosulfate, terephthalide discamphorsulfonic acid, polyacrylamide methyl benzylidene camphor, and the like.

[0051] Examples of the phenylbenzimidazole derivatives include phenylbenzimidazole sulfonic acid and disodium phenyldibenzimidazole tetrasulfonate.

[0052] Examples of phenylbenzotriazole derivatives include drometrizole trisiloxane and methylene bis(benzotriazolyl tetramethylbutylphenol).

[0053] Examples of the anthranil derivatives include menthyl anthranilate. The imidazoline derivatives include ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate. Examples of the benzalmalonate derivatives include polyorganosiloxanes having benzalmalonate functional groups, etc. Examples of the 4,4-diarylbutadiene derivatives include 1,1-dicarboxy(2,2'-dimethylpropyl)-4,4-diphenylbutadiene, etc.

[0054] Examples of silicone derivatives include polysilicone-14 and polysilicone-15.

[0055] The ultraviolet absorber is preferably a benzoic acid derivative, a triazine derivative, a dibenzoylmethane derivative, or a benzophenone derivative, and more preferably diethylamino hydroxybenzoyl hexyl benzoate, bisethylhexyloxyphenol methoxyphenyl triazine, t-butyl methoxydibenzoylmethane, or oxybenzone-4.

[0056] The cosmetic of the present invention may contain other components in addition to the above-mentioned coloring inhibitor and ultraviolet absorber. The other components are not particularly limited as long as they are components normally contained in cosmetics, and examples thereof include ultraviolet scattering agents, solvents such as water and ethyl alcohol, oils such as ester oils, silicone oils, hydrocarbon oils, vegetable oils, aliphatic alcohols, fatty acids, and waxes, moisturizing agents, coating (film) formers, spherical powders, emulsifiers, dispersants, gelling agents such as thickeners, organically modified clay minerals, fragrances, antioxidants, chelating agents, preservatives, antibacterial agents, stabilizers, etc.

[0057] Specific examples of the ultraviolet ray scattering agent include inorganic ultraviolet ray scattering agents such as titanium oxide and zinc oxide, but are not limited thereto, and any known ultraviolet ray scattering agent can be suitably used.

[0058] Examples of the solvent include water; lower alcohols having 5 or less carbon atoms, such as ethyl alcohol, n-propyl alcohol, isopropyl alcohol, butyl alcohol, and pentyl alcohol; but are not limited to these, and any known solvent can be suitably used.

[0059] Specific examples of oils include alkyl esters of benzoic acid (C12 to C15), diisostearyl malate, diglyceryl triisostearate, octyldodecyl lactate, tri(caprylic acid / capric acid)glyceryl, ethylhexyl hydroxystearate, diisopropyl adipate, dibutyl adipate, dioctyl adipate, isostearyl isostearate, hexyldecyl isostearate, neopentyl glycol dicaprate, and hexyl laurate. Syl, isopropyl myristate, isocetyl myristate, octyldodecyl myristate, isopropyl palmitate, isostearyl palmitate, cetyl palmitate, stearyl stearate, isocetyl stearate, diisopropyl sebacate, dioctyl sebacate, cetyl ricinoleate, octyldodecyl ricinoleate, dilauryl thiodipropionate, isononyl isononanoate, isotridecyl isononanoate, triethylhexanoin, citric acid Ester oils such as triethyl, isodecyl neopentanoate, isostearyl neopentanoate, and triethylhexyl trimellitate; silicone oils such as cyclopentasiloxane, dimethicone, caprylyl methicone, phenyl trimethicone, diphenyl dimethicone, and diphenylsiloxyphenyl trimethicone; hydrocarbon oils such as liquid paraffin, squalane, isododecane, hydrogenated polyisobutene, isoeicosane, hexadecane, and isohexadecane; oleic acid, linoleic acid, stearyl Examples of oils that can be used include, but are not limited to, fatty acids such as oleic acid, isostearic acid, palmitic acid, myristic acid, lauric acid, capric acid, behenic acid, undecylenic acid, lauaminopropionic acid, hydroxystearic acid, hydroxydecanoic acid, coconut fatty acid, hydrogenated coconut fatty acid, and palm kernel fatty acid; waxes; and aliphatic alcohols such as isostearyl alcohol, oleyl alcohol, hexyldecanol, and octyldodecanol. Any known oils can be suitably used.

[0060] Examples of antioxidants include bisethylhexylhydroxydimethoxybenzyl malonate, diethylhexylsyringinden malonate, dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA), vitamin E and derivatives thereof such as δ-tocopherol, thiotaurine, evening primrose extract, β-carotene, catechin compounds, flavonoid compounds, polyphenol compounds, ascorbic acid, and the like, but are not limited to these, and known antioxidants can be suitably used.

[0061] Examples of preservatives and antibacterial agents include parabens such as isopropylparaben and benzylparaben; benzoic acid, benzoate salts, alkyldiaminoethylglycine hydrochloride, photosensitizers, chlorcresol, chlorobutanol, salicylic acid, salicylate salts, sorbic acid and its salts, dehydroacetic acid and its salts, trichlorohydroxydiphenyl ether (triclosan), paraoxybenzoic acid esters and their sodium salts, phenoxyethanol, phenol, sodium lauryldiaminoethylglycine, resorcinol, zinc-ammonia-silver composite substituted zeolite, pantothenyl ethyl ether benzoate, isopropyl methyl fluoride, and the like. Examples of antiseptics and antibacterial agents that can be used include, but are not limited to, phenol, cetylpyridinium chloride, benzalkonium chloride, benzethonium chloride, chlorhexidine hydrochloride, orthophenylphenol, sodium orthophenylphenol, silver-copper zeolite, chlorhexidine gluconate, cresol, chloramine T, chloroxylenol, chlorphenesin, chlorhexidine, 1,3-dimethylol-5,5-dimethylhydantoin, alkylisoquinolinium bromide, thianthol, thymol, silver, silver oxide, silver nitrate, butylcarbamate propynyl iodide, and methylisothiazolinone.

[0062] Examples of the stabilizer include, but are not limited to, phenacetin, 8-hydroxyquinoline, acetanilide, sodium pyrophosphate, barbituric acid, uric acid, tannic acid, and the like, and any known stabilizer can be suitably used.

[0063] Examples of chelating agents include edetic acid (ethylenediaminetetraacetic acid (EDTA)), disodium edetate, tetrasodium edetate, hydroxyethylethylenediaminetriacetic acid (HEDTA) and its salts, diethylenetriaminepentaacetic acid and its salts, hydroxyethanediphosphonic acid (HEDP) and its salts, phytic acid, sodium citrate, and tartaric acid, but are not limited to these, and any known chelating agent can be suitably used.

[0064] Examples of dispersants include metal stearates such as calcium stearate and magnesium stearate; talc; and the like, but are not limited thereto, and any known dispersant can be suitably used.

[0065] Examples of fragrances include terpenes and terpenoids such as citral, menthol, camphor, salvinorin A, cannabinoids, hinokitiol, limonene, farnesol, and vitamin A; aromatic alcohols such as phenoxyethanol; phenols such as eugenol and shogaol; esters such as butyric acid esters and propionic acid esters; lactones such as γ-nonalactone and γ-undecalactone; and aldehydes having 6 to 20 carbon atoms; but are not limited to these, and any known fragrance can be suitably used.

[0066] As the emulsifier, various surfactants that are usually blended in cosmetics can be suitably used, such as anionic, cationic, nonionic, or amphoteric surfactants, and silicone-based or polymer-based emulsifiers can also be used.

[0067] Examples of thickening agents include gum arabic, carrageenan, karaya gum, tragacanth gum, carob gum, quince seed, casein, dextrin, gelatin, sodium pectinate, sodium alginate, methylcellulose, ethylcellulose, CMC, hydroxyethylcellulose, hydroxypropylcellulose, PVA, PVM, PVP, sodium polyacrylate, carboxyvinyl polymer, locust bean gum, guar gum, tamarind gum, dialkyldimethylammonium cellulose sulfate, xanthan gum, magnesium aluminum silicate, bentonite, hectorite, and the like, but are not limited to these, and known thickening agents can be suitably used.

[0068] The content of the other components in the cosmetic of the present invention is not particularly limited, and the amount of these components to be contained may be appropriately determined as necessary depending on the effects, physical properties, etc. required for the cosmetic. The above-mentioned other components are optional components, and the above-mentioned cosmetic does not necessarily need to contain the other components.

[0069] The cosmetic of the present invention is not particularly limited, but examples thereof include sunscreen cosmetics; basic cosmetics such as lotion, cream, milky lotion, and serum; makeup cosmetics such as foundation, base milky lotion, cheek color, eye shadow, mascara, and lipstick; and hair cosmetics such as wax, spray, gel, and mists. The form of the cosmetic of the present invention is not particularly limited, and examples thereof include liquids (emulsions) such as oil-in-water (O / W) and water-in-oil (W / O) types, such as gels; liquids other than the above-mentioned liquids, for example liquids used as sprays such as aerosol sprays (aqueous solutions, dispersions); creams; gels; and solids solidified into sticks.

[0070] [Coloring suppression method] Since the polycarboxylic acid polymer (α) and the polyalkyleneimine polymer (β) have an excellent effect of suppressing discoloration of an ultraviolet absorber, the present invention also includes a method for suppressing discoloration of an ultraviolet absorber, which includes a step of adding the polycarboxylic acid polymer (α) and / or the polyalkyleneimine polymer (β) to the ultraviolet absorber. EXAMPLES

[0071] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In addition, unless otherwise specified, "parts" means "parts by weight" and "%" means "% by mass".

[0072] (Production Example 1) In a 2.5L SUS reactor equipped with a reflux condenser and an agitator, 200.6g of deionized water, 308.1g of 48% aqueous sodium hydroxide solution (hereinafter referred to as 48% NaOH), and 180.1g of maleic anhydride were charged and heated to the boiling point under stirring. Next, 174.0g of 80% aqueous acrylic acid solution (hereinafter referred to as 80% AA) was dripped into the polymerization reaction system at the boiling point under stirring for 265 minutes, 55.6g of 15% aqueous sodium persulfate solution (hereinafter referred to as 15% NaPS) for 270 minutes, and 46.4g of 35% aqueous hydrogen peroxide solution (hereinafter referred to as 35% H2O2) for 265 minutes from the tip nozzle through separate supply paths. Each component was dripped continuously at a constant drip rate. After the above dropping was completed, 56.3 g of 48% NaOH and 14.3 g of 35% sodium hydrogen sulfite aqueous solution (hereinafter referred to as 35% SBS) were added and stirred for 10 minutes to obtain a 45 wt% aqueous solution of polycarboxylic acid polymer (acrylic acid / maleic acid copolymer sodium salt=51 / 49 (mol%)). The weight average molecular weight (Mw) of the polycarboxylic acid polymer was 5,000. The copolymer obtained in Production Example 1 is referred to as Compound 1.

[0073] (Production Example 2) In a 2.5L SUS reactor equipped with a reflux condenser and agitator, 40.5g of deionized water, 193.0g of 48% NaOH, and 113.9g of maleic anhydride were charged and heated to the boiling point under stirring. Next, 246.3g of 80% AA, 71.9g of 15% NaPS, and 57.5g of 35% H2O2 were dropped from the tip nozzle through separate supply paths for 240 minutes, 245 minutes, and 240 minutes, respectively, into the polymerization reaction system at the boiling point under stirring. Each component was dropped continuously at a constant dropping rate. After all of the above dropping was completed, 200.2g of 48% NaOH and 13.8g of 35% SBS were added and stirred for 10 minutes to obtain a 45wt% aqueous solution of polycarboxylic acid polymer (acrylic acid / maleic acid copolymer sodium salt = 71 / 29 (mol%)). The weight average molecular weight (Mw) of the polycarboxylic acid polymer was 10,000. The copolymer obtained in Production Example 2 is referred to as Compound 2.

[0074] (Production Example 3) In a 2.5L SUS reactor equipped with a reflux condenser and agitator, 126.3g of deionized water, 155.3g of 48% NaOH, and 91.5g of maleic anhydride were charged and heated to the boiling point under stirring. Next, 301.1g of 80% AA was dripped into the polymerization reaction system at the boiling point under stirring for 180 minutes, 47.4g of 15% NaPS for 210 minutes, 193.8g of 48% NaOH for 180 minutes, 2.5g of 35% H2O2 for 60 minutes from 120 minutes after the start of 80% AA dripping, and 110.1g of ion-exchanged water for 95 minutes from 90 minutes after the start of 80% AA dripping, respectively, through separate supply paths from the tip nozzle. The dripping of each component was carried out continuously at a constant dripping rate. After the above dropping was completed, 44.9 g of 48% NaOH was added and stirred for 10 minutes to obtain a 45 wt% aqueous solution of polycarboxylic acid polymer (acrylic acid / maleic acid copolymer sodium salt=78 / 22 (mol%)). The weight average molecular weight (Mw) of the polycarboxylic acid polymer was 60,000. The copolymer obtained in Production Example 3 is referred to as Compound 3.

[0075] (Production Example 4) In a 2.5L SUS reaction vessel equipped with a reflux condenser and agitator, 64.0g of deionized water, 249.6g of 48% NaOH, and 145.9g of maleic anhydride were charged and heated to the boiling point under stirring. Next, 226.3g of 80% AA was dripped into the polymerization reaction system at the boiling point for 120 minutes, 31.2g of 15% NaPS for 144 minutes, 5.6g of 35% H2O2 for 144 minutes, and 181.9g of ion-exchanged water for 144 minutes from the tip nozzle through separate supply paths. Each component was dripped continuously at a constant drip rate. After all of the dripping was completed, 125.5g of 48% NaOH was added and stirred for 10 minutes to obtain a 45wt% aqueous solution of polycarboxylic acid polymer (acrylic acid / maleic acid copolymer sodium salt = 63 / 37 (mol%)). The weight average molecular weight (Mw) of the polycarboxylic acid polymer was 50,000. The copolymer obtained in Production Example 4 is referred to as Compound 4.

[0076] The weight average molecular weights of Compounds 1 to 4 were measured by the following method. <Weight average molecular weight measurement conditions (GPC)> Equipment: Tosoh Corporation HLC-8320GPC Detector: RI Column: SHODEX Asahipak GF-310-HQ manufactured by Showa Denko K.K. GF-710-HQ, GF-1G-7B Column temperature: 40℃ Flow rate: 0.5mL / min. Amount of sample solution injected: 10 μL (sample concentration is 0.5% by mass) Calibration curve: Created using polyacrylic acid standards (Mp = 94, 900, 2925, 7500, 28000, 115000, 143800, 589700) manufactured by Sowa Scientific Co., Ltd., using a cubic equation based on Mp and elution time. Eluent: 0.1N sodium acetate aqueous solution

[0077] The compositions were prepared and evaluated for color inhibition as follows. The raw materials listed in Tables 1-1 to 1-8, 2, and 3 are as follows. *1 Product name: Uvinul A Plus Granular (manufactured by BASF) *2 Product name: Parsol Shield (manufactured by DSM) *3 Product name: Eusolex (registered trademark) 9020 (Merck) *4 Product name: Escarol 577 (manufactured by Ashland) *5 Product name: FineNeo-iPSE (manufactured by Nippon Fine Chemicals Co., Ltd.) *6 Product name: CR-A100 (manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight (Mw) 10,000, 45 wt% aqueous solution of polyacrylic acid) *7 Product name: CR-H35 (manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight (Mw) 3,500, 44 wt% aqueous solution of sodium polyacrylate) *8 Product name: CR-H1700 (manufactured by Nippon Shokubai Co., Ltd., weight average molecular weight (Mw) 170,000, 30 wt% aqueous solution of sodium polyacrylate) *9 Compound 1 synthesized in Production Example 1 *10 Compound 2 synthesized in Production Example 2 *11 Compound 3 synthesized in Production Example 3 *12 Compound 4 synthesized in Production Example 4 *13 Product name: Haiter (Kao Corporation) *14 Product name: CC-H700 (manufactured by Nippon Shokubai Co., Ltd., a 30 wt% aqueous solution of polyethyleneimine with a weight-average molecular weight (Mw) of 250,000) *15 Product name: Epomin SP-012 (manufactured by Nippon Shokubai Co., Ltd., a polyethyleneimine product with a weight-average molecular weight (Mw) of 1,600 and 98% by weight or more) *16 Product name: ZX-CC-C-130 (manufactured by Nippon Shokubai Co., Ltd., 80 wt% aqueous solution of polyethyleneimine ethoxylate with a weight average molecular weight (Mw) of 13,000, and EO addition mole number of 20 mol) *17 Product name: SIMULGEL EG QD (manufactured by SEPPIC) *18 1,3-butylene glycol (purity 99.5% or more) *19 Product name: Chirest 2B-SD (manufactured by Chirest) *20 Product name: Eusolex 2292 (Merck) *21 Product name: KF-96A-6cs (manufactured by Shin-Etsu Chemical Co., Ltd.) *22 Product name: Neolite P (manufactured by Koyu Alcohol Kogyo) *23 Product name: 99.5% ethanol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) *24 Product name: Matsumoto Microsphere M-305 (manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.) *25 Product name: Phenoxyethanol-S (manufactured by Yokkaichi Chemical Co., Ltd.) *26 Product name: KF-995 (manufactured by Shin-Etsu Chemical Co., Ltd.) *27 Product name: Neosolue-MP (manufactured by Nippon Fine Chemicals Co., Ltd.) *28 Product name: KF-7312K (manufactured by Shin-Etsu Chemical Co., Ltd.) *29 Product name: KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.) *30 Product name: KF-6038 (manufactured by Shin-Etsu Chemical Co., Ltd.) *31 Product name: DIS-TL-10A (manufactured by Sakai Chemical Industry Co., Ltd., oil dispersion of fine titanium dioxide and isononyl isononanoate)

[0078] (Reference Example 1, Comparative Examples 1 to 4, Examples 1 to 5) 0.2 g of diethylaminohydroxybenzoylhexylbenzoate and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C and then cooled to room temperature, and each polymer was mixed in the amount shown in Table 1-1, and the difference in appearance color from Reference Example 1 was visually confirmed. The criteria for evaluation are as follows. Judgment criteria: ×: Discoloration to reddish color compared to Reference Example 1 ○: Color is close to or at the same level as Reference Example 1

[0079] [Table 1-1]

[0080] (Reference Example 2, Comparative Examples 5 to 8, Examples 6 to 10) 0.2 g of bisethylhexyloxyphenol methoxyphenyl triazine and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C, and then cooled to room temperature. Each polymer was mixed in the amount shown in Table 1-2, and the difference in appearance color from Reference Example 2 was visually confirmed. The criteria for judgment are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 2 ○: Color is close to or at the same level as Reference Example 2

[0081] [Table 1-2]

[0082] (Reference Example 3, Comparative Examples 9 to 12, Examples 11 to 15) 0.2 g of t-butyl methoxydibenzoylmethane and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C and then cooled to room temperature, and each polymer was mixed in the amount shown in Table 1-3, and the difference in appearance color from Reference Example 3 was visually confirmed. The criteria for judgment are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 3 ○: Color is close to or at the same level as Reference Example 3

[0083] [Table 1-3]

[0084] (Reference Example 4, Comparative Examples 13 to 16, Examples 16 to 20) After dissolving 0.2 g of oxybenzone-4 and 0.8 g of purified water, each polymer was mixed in the amount shown in Table 1-4, and the difference in appearance color from Reference Example 4 was visually confirmed. The evaluation criteria are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 4 ○: Color is close to or at the same level as Reference Example 4

[0085] [Table 1-4]

[0086] (Reference Example 1, Comparative Example 1, Examples 21 to 23) 0.2 g of diethylaminohydroxybenzoylhexyl benzoate and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C and then cooled to room temperature, and each polymer was mixed in the amount shown in Table 1-5, and the difference in appearance color from Reference Example 1 was visually confirmed. The criteria for judgment are as follows. Judgment criteria: ×: Discoloration to reddish color compared to Reference Example 1 ○: Color is close to or at the same level as Reference Example 1

[0087] [Table 1-5]

[0088] (Reference Example 2, Comparative Example 5, Examples 24 to 26) 0.2 g of bisethylhexyloxyphenol methoxyphenyl triazine and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C, and then cooled to room temperature. Each polymer was mixed in the amount shown in Table 1-6, and the difference in appearance color from Reference Example 2 was visually confirmed. The criteria for judgment are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 2 ○: Color is close to or at the same level as Reference Example 2

[0089] [Table 1-6]

[0090] (Reference Example 3, Comparative Example 9, Examples 27 to 29) 0.2 g of t-butyl methoxydibenzoylmethane and 0.8 g of diisopropyl sebacate were dissolved by heating at 85°C and then cooled to room temperature, and each polymer was mixed in the amount shown in Table 1-7, and the difference in appearance color from Reference Example 3 was visually confirmed. The evaluation criteria are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 3 ○: Color is close to or at the same level as Reference Example 3

[0091] [Table 1-7]

[0092] (Reference Example 4, Comparative Example 13, Examples 30 to 32) After dissolving 0.2 g of oxybenzone-4 and 0.8 g of purified water, each polymer was mixed in the amount shown in Table 1-8, and the difference in appearance color from Reference Example 4 was visually confirmed. The evaluation criteria are as follows. Judgment criteria: ×: Yellowish color is stronger than that of Reference Example 4 ○: Color is close to or at the same level as Reference Example 4

[0093] [Table 1-8]

[0094] (Comparative Example 17, Examples 33 to 35) The sunscreen cosmetic compositions shown in Table 2 were prepared according to the following procedure. 1) Mix ingredients 1 to 5 uniformly (disperser = 1500 rpm, 5 minutes, room temperature) 2) Add ingredients 6 to 10, which have been preheated to 85°C and uniformly dissolved, to 1) and emulsify (Homomixer = 5000 rpm, 5 minutes, room temperature). 3) Add ingredients 11 and 12, which have already been mixed uniformly, to 2) and mix uniformly. 4) Add component 13 to 3) and mix uniformly.

[0095] Evaluation of color-inhibiting effect when using chlorine bleach A 100% white cotton fabric was cut into a 3 cm x 3 cm square, and 0.2 g of each of the sunscreen compositions shown in Table 2 was spread onto it, followed by drying at 25°C for 1 hour. An aqueous solution was prepared by uniformly mixing 12 ml of commercially available Haiter (manufactured by Kao Corporation) with 5 L of purified water, and 10 g of each was weighed out and placed in a container, in which the fabric with the sunscreen composition thus prepared was immersed, left to stand at 25°C for 15 minutes, then removed and visually inspected for the presence or absence of coloration. The evaluation criteria are as follows: Judgment criteria: ×: White fabric turns pink ○: The pink coloring of the white fabric is lighter than that of Comparative Example 17 ◎: White fabric will not be stained

[0096] [Table 2]

[0097] (Comparative Example 18, Examples 36 to 38) The sunscreen cosmetic compositions shown in Table 3 were prepared according to the following procedure. 1) Heat ingredients 2 to 5 to 85℃ and dissolve uniformly. 2) Add ingredients 1, 6, 7, 8, and 9 to 1 in order and mix uniformly. 3) Gradually add ingredients 11 to 15, which have been uniformly dissolved in advance, to 2) and emulsify (during addition: Disperser = 1500 rpm, 2.5 minutes, after addition: Disperser = 2500 rpm, 2.5 minutes, room temperature).

[0098] Evaluation of color-inhibiting effect when using chlorine bleach A 100% white cotton fabric was cut into a 3 cm x 3 cm square, and 0.2 g of each of the sunscreen compositions shown in Table 3 was spread on it, and then dried at 25°C for 1 hour. An aqueous solution was prepared by uniformly mixing 12 ml of commercially available Haiter (manufactured by Kao Corporation) with 5 L of purified water, and 10 g of each was weighed out and placed in a container, in which the fabric with the sunscreen composition thus prepared was immersed, left to stand at 25°C for 15 minutes, then removed and visually inspected for the presence or absence of coloration. The evaluation criteria are as follows: Judgment criteria: ×: White fabric turns pink ○: The pink coloring of the white fabric is lighter than that of Comparative Example 17 ◎: White fabric will not be stained

[0099] [Table 3]

Claims

1. A coloration inhibitor for an ultraviolet absorber, comprising a polycarboxylic acid polymer (α) having a structural unit (a) derived from an unsaturated monocarboxylic acid monomer (A) and a structural unit (b) derived from an unsaturated dicarboxylic acid monomer (B).

2. 2. The coloring inhibitor for an ultraviolet absorber according to claim 1, wherein the polycarboxylic acid polymer (α) has a content of the structural unit (b) of 15 to 80 mol % relative to 100 mol % of all structural units.

3. A coloration inhibitor for an ultraviolet absorber, comprising a polyalkyleneimine-based polymer (β) having a structural unit (c) derived from an alkyleneimine.

4. 4. The coloring inhibitor for an ultraviolet absorber according to claim 3, wherein the polyalkyleneimine-based polymer (β) is a polyalkyleneimine or a polyalkyleneimine derivative having a structural unit (c) derived from an alkyleneimine and a structural unit (d) derived from an alkylene oxide.

5. A cosmetic comprising the coloring inhibitor for an ultraviolet absorbent according to any one of claims 1 to 4 and an ultraviolet absorbent.

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