Functional particle dispersions

Abstract

Provided are: a functional particle dispersion which has a high level of antibacterial effect, reducing performance, and aromatic performance, has long-lasting properties (slow release properties), does not adversely affect other compounding components and the like, and can be used for writing tools, and a water-based ink composition for writing tools, which contains the functional particle dispersion; in addition, the dispersion stability is excellent even in a compounding system which is susceptible to ion influence, and the functional particles have a large degree of freedom in design, and can be used in various applications. The functional particle dispersion of the present invention is characterized in that functional particles comprising at least a (meth) acrylate monomer represented by general formula (I), at least one specific antibacterial component, a reducing component, and at least one fragrance component of a fragrance are dispersed in water, and the Zeta potential measurement value of the surface of the functional particles is in the range of-15 to + 15 mV. [In formula (I), A is H or the like, and R is H, an alkyl group having 1-22 carbon atoms or the like].

Description

TECHNICAL FIELD

[0001] The present specification relates to a functional particle dispersion having excellent dispersion stability, and excellent antibacterial effect, fragrance performance, or oxygen reduction performance (oxygen absorption capacity). BACKGROUND

[0002] In the past, as antibacterial particles having an antibacterial effect, reduction particles capable of balancing the strength and persistence (slow release) of the oxygen reduction performance (oxygen absorption capacity), and the like, a large number of types and / or properties of functional particles are known.

[0003] The present applicant has proposed a reduction particle dispersion in which reduction particles composed of at least a (meth)acrylate monomer represented by a specific formula and a specific reduction component are dispersed in water (for example, refer to Patent Document 1), and an antibacterial particle dispersion in which antibacterial particles composed of at least a (meth)acrylate monomer represented by a specific formula and a specific antibacterial component are dispersed in water (for example, refer to Patent Document 2).

[0004] However, the reduction particle dispersion and the antibacterial particle dispersion described in the above-described Patent Documents 1 and 2 are functional particle dispersions having excellent effects that have not been possessed in the past, and when these dispersions are added to a compounding system of a fine dispersion liquid and / or a compounding system of an aqueous ink, and the like, sometimes a phenomenon in which the stability becomes slightly insufficient occurs in a part.

[0005] If the reasons and the like are further studied, in the above-described reduction particle dispersion and / or antibacterial particle dispersion, in each of the dispersions described in the above-described Patent Documents 1 and 2 in which an anionic surfactant is used as a polymerizable surfactant in order to obtain a high dispersion force and the antibacterial particles and the like are configured by charge repulsion, due to the charges of various particles contained in the ink, sometimes a problem in which the dispersion of the above-described compounding system cannot maintain the initial state of stability, or the surface tension of the ink cannot be maintained compared to the initial state, and the like occurs.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT DOCUMENTS

[0008] Patent Document 1: Japanese Patent Application Publication No. 2022-138102 (claims, examples, and the like)

[0009] Patent Document 2: Japanese Patent Application Publication No. 2023-1833 (claims, examples, and the like) SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] The present application has been made in view of the above-described problems of the prior art and the like, and aims to provide a functional particle dispersion and the like which can achieve both antibacterial effect, or fragrance performance, or strength and persistence (sustained release) of oxygen reduction performance (oxygen absorption capacity), and which is excellent in dispersion stability and / or surface tension stability even in a compounding system and the like which is easily affected by ions, and is low in irritation, and which is high in design freedom of a compounding system and the like which is easily affected by ions even when a functional particle is contained, and which can be used for various purposes.

[0012] Solution to the problem

[0013] The present inventors have made intensive studies in view of the above-described problems of the prior art and the like, and as a result, have found that a functional particle dispersion of a specific property constituted by at least a (meth)acrylate monomer represented by a specific formula and a specific functional ingredient is dispersed in water, and the above-described target functional particle dispersion and the like can be obtained, thereby completing the present application.

[0014] That is, the functional particle dispersion of the present first mode is characterized in that a functional particle constituted by at least a (meth)acrylate monomer represented by the following general formula (I) and at least one antibacterial ingredient selected from the following Group X is dispersed in water, and the Zeta potential measurement value of the functional particle is in the range of -15 to +15 mV.

[0015]

[0016] [In the above formula (I), A is a hydrogen atom (H) or a methyl group (CH3), and R represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a substituent having a polyalkylene glycol chain having 2 to 18 carbon atoms in the alkylene chain, and the alkyl group or the substituent having the polyalkylene glycol chain can have a phenyl group, a benzyl group, an epoxy group, a hydroxyl group, a dialkylamino group, an alkoxy group having 1 to 18 carbon atoms, a perfluoroalkyl group having 1 to 18 carbon atoms, or a trialkoxysilyl group as a substituent.]

[0017] X group: iodopropargyl compounds, thiabendazole, sodium pentachlorophenol, 1,2-benzisothiazolin-3-ketone, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, phenol, sodium benzoate, sodium dehydroacetate, potassium sorbate, morpholine, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, sodium 2-pyridinethiol-1-oxide, sodium pyrithione, 2-(4-thiazolyl)benzimidazole, pinene-4-ol, 1,8-eucalyptol, thymol, diisothiocyanate, eucalyptus oil, longifolene, isopropyl methyl phenol, 2-methyl-4-isothiazolin-3-ketone, citral, eugenol, allyl isothiocyanate, d-limonene, tannic acid, nipagin ethyl, benzalkonium chloride, glyceryl octanoate, glyceryl fatty acid ester, chlorphenesin, salicylic acid, ethyl paraben, butyl paraben, propyl paraben, methyl paraben, bisabalol, hinokitiol, phenylethyl alcohol, phenethyl alcohol, phenoxyethanol, nipagin butyl, nipagin propyl, benzalkonium chloride, nipagin methyl.

[0018] Further, the functional particle dispersion of the present second aspect is characterized in that a functional particle composed of at least the (meth)acrylate monomer represented by the above general formula (I), at least one antibacterial component selected from the above X group, and at least one perfume component is dispersed in water, and the Zeta potential measurement value of the functional particle is in the range of -15 to +15 mV.

[0019] Further, the functional particle dispersion of the present third aspect is characterized in that a functional particle composed of at least the (meth)acrylate monomer represented by the above general formula (I) and at least one reducing component selected from the above Z group is dispersed in water, and the Zeta potential measurement value of the functional particle is in the range of -15 to +15 mV.

[0020] Z group: polyphenols, copper chlorophyll, flavonoids, anthocyanins, dibutylhydroxytoluene, butylhydroxyanisole.

[0021] The water-based ink composition for a writing instrument of the present disclosure is characterized by containing the functional particle dispersion of any one of the above first to third aspects.

[0022] The cosmetic of the present disclosure is characterized by containing the functional particle dispersion of any one of the above first to third aspects.

[0023] Effects of the Invention

[0024] According to the present disclosure, a functional particle dispersion capable of balancing the strength and persistence (slow release property) of an antibacterial effect, a fragrance property, or a reduction property (oxygen absorption capacity) of oxygen, and also excellent in dispersion stability, stability of surface tension, and low irritability even in a compounding system and the like that are easily affected by ions, and high in the degree of freedom of design of a compounding system and the like even when a functional particle is contained, and capable of being used for various purposes, a writing instrument aqueous ink composition containing the functional particle dispersion, and a cosmetic are provided.

[0025] The objects and effects of the present disclosure are recognized and obtained by using the constituent elements and combinations indicated particularly in the claims. The general description and the detailed description to be described later are both illustrative and explanatory contents, and do not limit the present disclosure recited in the claims. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a partial cross-sectional view showing an example of a cosmetic application tool that accommodates a cosmetic of the present invention. DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments of the present disclosure will be described in detail. However, it should be noted that the technical scope of the present disclosure is not limited to the following detailed description of each embodiment, but relates to the invention recited in the claims and equivalents thereof. Hereinafter, when referred to as "the present disclosure", it refers to each functional particle dispersion of the following first to third embodiments. In addition, when referred to as "antibacterial effect", it includes a mold-proof effect / antiseptic effect, and further, when referred to as "antibacterial property", it includes a mold-proof property / antiseptic property.

[0028] (Functional particle dispersion of the first embodiment)

[0029] The functional particle dispersion of the present first embodiment is characterized in that a functional particle composed of at least a (meth)acrylate monomer represented by the following general formula (I) and at least one antibacterial component selected from the following Group X is dispersed in water, and the Zeta potential measurement value of the functional particle is in the range of -15 to +15 mV.

[0030]

[0031] [In the above formula (I), A is a hydrogen atom (H) or a methyl group (CH3), and R represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a substituent having a polyalkylene glycol chain of 2 to 18 carbon atoms in the alkylene chain, which alkyl group or substituent having a polyalkylene glycol chain can have a phenyl group, a benzyl group, an epoxy group, a hydroxyl group, a dialkylamino group, an alkoxy group having 1 to 18 carbon atoms, a perfluoroalkyl group having 1 to 18 carbon atoms, or a trialkoxysilyl group as a substituent.]

[0032] Group X: iodopropyl butylcarbamate, thiabendazole, sodium pentachlorophenoxide, 1,2-benzisothiazolin-3-one, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, parabens, phenol, sodium benzoate, sodium dehydroacetate, potassium sorbate, morpholine, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, 2-mercaptopyridine-1-oxide sodium salt, 1-hydroxypyridinethione sodium salt, 2-(4-thiazolyl)benzimidazole, p-mentha-8- thyl-3,6-diol, eucalyptol, thymol, diisothiocyanate, eucalyptus oil, longifolene, isopropyl methyl phenol, 2-methyl-4-isothiazolin-3-one, citral, eugenol, allyl isothiocyanate, d-limonene, tannic acid, sodium benzoate, ethylparaben, benzalkonium chloride, glycerol caprylate, glycerol fatty acid ester, chlorphenesin, salicylic acid, ethyl paraben, butyl paraben, propyl paraben, methyl paraben, bisabalol, hinokitiol, phenylethyl alcohol, 2-phenylethanol, phenoxyethanol, butylparaben, propylparaben, benzalkonium chloride, methylparaben.

[0033] The (meth)acrylate monomer represented by the above general formula (I) used in the present application is used from the viewpoint of being able to produce a stable particle that can encapsulate a functional ingredient, not causing adverse effects on other compounding ingredients, etc., the persistence of the effect, and the like.

[0034] R in the above general formula (I) represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a substituent having a polyalkylene glycol chain of 2 to 18 carbon atoms in the alkylene chain, which alkyl group or substituent having a polyalkylene glycol chain can have a phenyl group, a benzyl group, an epoxy group, a hydroxyl group, a dialkylamino group, an alkoxy group having 1 to 18 carbon atoms, a perfluoroalkyl group having 1 to 18 carbon atoms, or a trialkoxysilyl group as a substituent, and examples thereof include a straight-chain or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an alkyl group having 1 to 18 carbon atoms which can have an epoxy group, a hydroxyl group, a dialkylamino group, or an alkoxy group having 1 to 4 carbon atoms as a substituent, and particularly, a straight-chain or branched alkyl group having 1 to 6 carbon atoms which can have an epoxy group, a hydroxyl group, or an alkoxy group having 1 to 2 carbon atoms as a substituent, a cycloalkyl group having 3 to 10 carbon atoms, a hydroxyl group, a trifluoroethyl group, a dimethylaminoethyl group, a methoxyethyl group, a hydroxyethyl group, a hydroxypropyl group, an allyl group, a tetrahydrofurfuryl group, a phenyl group, a benzyl group, a butoxydiethylene glycol group, a methoxypolyethylene glycol group, a dimethylaminoethyl group, a diethylaminoethyl group, a glycidyl group, an ethyl phosphate group, a 1,4-butanediol group, a 1,6-hexanediol group, a 1,9-nonanediol group, and the like.

[0035] R in the above general formula (I) represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a substituent having a polyalkylene glycol chain of 2 to 18 carbon atoms in the alkylene chain, which alkyl group or substituent having a polyalkylene glycol chain can have a phenyl group, a benzyl group, an epoxy group, a hydroxyl group, a dialkylamino group, an alkoxy group having 1 to 18 carbon atoms, a perfluoroalkyl group having 1 to 18 carbon atoms, or a trialkoxysilyl group as a substituent, and examples thereof include a straight-chain or branched alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, an alkyl group having 1 to 18 carbon atoms which can have an epoxy group, a hydroxyl group, a dialkylamino group, or an alkoxy group having 1 to 4 carbon atoms as a substituent, and particularly, a straight-chain or branched alkyl group having 1 to 6 carbon atoms which can have an epoxy group, a hydroxyl group, or an alkoxy group having 1 to 2 carbon atoms as a substituent, a cycloalkyl group having 3 to 10 carbon atoms, a hydroxyl group, a trifluoroethyl group, a dimethylaminoethyl group, a methoxyethyl group, a hydroxyethyl group, a hydroxypropyl group, an allyl group, a tetrahydrofurfuryl group, a phenyl group, a benzyl group, a butoxydiethylene glycol group, a methoxypolyethylene glycol group, a dimethylaminoethyl group, a diethylaminoethyl group, a glycidyl group, an ethyl phosphate group, a 1,4-butanediol group, a 1,6-hexanediol group, a 1,9-nonanediol group, and the like.

[0036] Note that in the present specification, the expression "(meth)acrylic acid" means "acrylic acid and / or methacrylic acid".

[0037] As specific examples of the (meth)acrylate represented by the above general formula (I) used, at least one of (meth)acrylate of methyl group, (meth)acrylate of ethyl group, (meth)acrylate of propyl group, (meth)acrylate of isopropyl group, (meth)acrylate of n-butyl group, (meth)acrylate of isobutyl group, (meth)acrylate of t-butyl group, (meth)acrylate of hexyl group, (meth)acrylate of octyl group, (meth)acrylate of 2-ethylhexyl group, (meth)acrylate of lauryl group, (meth)acrylate of palmitoyl group, (meth)acrylate of stearyl group, (meth)acrylate of behenyl group, (meth)acrylate of cyclohexyl group, (meth)acrylate of phenyl group, (meth)acrylate of benzyl group, (meth)acrylate of isobornyl group, (meth)acrylate of glycidyl group, (meth)acrylate of tetrahydrofurfuryl group, (meth)acrylate of allyl group, (meth)acrylate of 2-hydroxyethyl group, (meth)acrylate of hydroxypropyl group, (meth)acrylate of 2-methoxyethyl group, (meth)acrylate of 2-ethoxyethyl group, (meth)acrylate of dimethylaminoethyl group, (meth)acrylate of dimethylaminoethyl methyl chloride salt, (meth)acrylate of diethylaminoethyl group, di(meth)acrylate of ethylene glycol, di(meth)acrylate of triethylene glycol, di(meth)acrylate of 1,3-butanediol, di(meth)acrylate of 1,6-hexanediol, trimethylolpropane tri(meth)acrylate, 2-(meth)acryloyloxyethyl phthalate, 2-(meth)acryloyloxyethyl hexahydrophthalate, (meth)acrylate of trifluoroethyl group, (meth)acrylate of butoxyethyl group, (meth)acrylate of methoxytetraethylene glycol, (meth)acrylate of 2-hydroxypropyl group, (meth)acrylate of 3-chloro-2-hydroxypropyl group, (meth)acrylate of 2-hydroxy-3-phenoxypropyl group, (meth)acrylate of diethylene glycol, (meth)acrylate of 2-(dimethylamino)ethyl group, 2-(dimethylamino)propyl group, (meth)acrylate of 2-(dimethylamino)butyl group, (meth)acrylate of 2-isocyanatoethyl group, (meth)acrylate of 2-(acetoacetoxy)ethyl group, perfluoroethyl methacrylate having a perfluoroalkyl group of carbon atom number 1 to 18, 2-(meth)acryloyloxyethyl phosphate, trialkoxysilylpropyl (meth)acrylate, dialkoxymethylsilylpropyl (meth)acrylate, and the like (each alone or two or more kinds, the same applies here) can be mentioned.

[0038] Among them, from the viewpoint of being industrially easily available, easy and safe handling at the time of production, further improving the effects of the present application, and the like, it is preferable that (meth) acrylic acid methyl ester, (meth) acrylic acid ethyl ester, (meth) acrylic acid propyl ester, (meth) acrylic acid isopropyl ester, (meth) acrylic acid n-butyl ester, (meth) acrylic acid isobutyl ester, (meth) acrylic acid t-butyl ester, (meth) acrylic acid hexyl ester, (meth) acrylic acid octyl ester, (meth) acrylic acid 2-ethylhexyl ester, (meth) acrylic acid cyclohexyl ester.

[0039] In the present first embodiment, in addition to the above (meth) acrylic ester monomer, from the viewpoint of further obtaining a sustained functional effect, and the like, a hydrophobic vinyl monomer other than the above (meth) acrylic ester monomer, an aqueous monomer can be preferably used.

[0040] As the hydrophobic vinyl monomer, for example, at least one monomer among styrene, methylstyrene, and the like, styrene-based monomers other than the above (meth) acrylic ester monomer can be used.

[0041] As the hydrophobic vinyl monomer that can be used, for example, at least one among styrene, methylstyrene, chloromethylstyrene, alkylstyrene having an alkyl group having a carbon atom number of 1 to 12, methoxystyrene, chlorostyrene, bromostyrene, divinylbenzene, phenylstyrene, vinyl naphthalene, vinyl acetate, chloroethylene, acrylonitrile, methacrylonitrile, and the like can be exemplified.

[0042] As the aqueous monomer that can be used, for example, at least one among glycerol monomethacrylate, 2-ethanesulfonic acid methacrylic acid sodium salt, polyethylene glycol monomethacrylate, polypropylene glycol monomethacrylate, polyethylene glycol-propylene glycol monomethacrylate, polyethylene glycol-tetramethylene glycol-monomethacrylate, propylene glycol-polybutylene glycol-monomethacrylate, vinyl pyrrolidone, and the like can be exemplified.

[0043] The antibacterial ingredient used in the first embodiment is at least one member selected from the group consisting of iodoallyl compounds, thiabendazole, sodium pentachlorophenol, 1,2-benzisothiazolin-3-one, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, p-hydroxybenzoic acid esters (ethyl ester, methyl ester, propyl ester, isopropyl ester, butyl ester, isobutyl ester, etc.), phenol, sodium benzoate, sodium dehydroacetate, potassium sorbate, morpholine, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, 2-mercaptopyridine-1-oxide sodium salt, 1-hydroxypyridinethione sodium salt, 2-(4-thiazolyl)benzimidazole, pinene-4-ol, 1,8-eucalyptol, thymol, diisothiocyanate, eucalyptus oil, longifolene, isopropylmethylphenol, 2-methyl-4-isothiazolin-3-one, citral, eugenol, allylisothiocyanate, d-limonene, tannic acid, sodium benzoate, ethylparaben, benzalkonium chloride, glycerol caprylate, glycerol fatty acid ester, chlorphenesin, salicylic acid, ethyl p-hydroxybenzoate, butyl p-hydroxybenzoate, propyl p-hydroxybenzoate, methyl p-hydroxybenzoate, bisabalol, hinokitiol, phenylethyl alcohol, 2-phenylethyl alcohol, phenoxyethanol, butylparaben, propylparaben, benzalkonium chloride, and methylparaben (each alone or in a mixture of two or more kinds; the same applies hereinafter).

[0044] As the iodoallyl compound which can be used, for example, at least one member selected from the group consisting of 3-iodo-2-propynyl propyl carbamate, 3-iodo-2-propynyl butyl carbamate (IPBC), 3-iodo-2-propynyl m-chlorophenyl carbamate, 3-iodo-2-propynyl phenyl carbamate, 3-iodo-2-propynyl 2,4,5-trichlorophenyl ether, 3-iodo-2-propynyl 4-chlorophenyl formate (IPCF), di-(3-iodo-2-propynyl) hexyl dicarbamate, 3-iodo-2-propynyloxy ethanol ethyl carbamate, 3-iodo-2-propynyloxy ethanol phenyl carbamate, 3-iodo-2-propynyl thioxothioethyl carbamate, 3-iodo-2-propynyl carbamate (IPC), N-iodoallyloxy carbonyl alanine, N-iodoallyloxy carbonyl alanine ethyl ester, 3-(3-iodoallyl) benzoxazol-2-one, 3-(3-iodoallyl)-6-chlorobenzoxazol-2-one, 3-iodo-2-propynol, 4-chlorophenyl-3-iodoallyl formate, 3-bromo-2,3-diiodo-2-propenyl ethyl carbamate, 3-iodo-2-propynyl n-hexyl carbamate, 3-iodo-2-propynyl cyclohexyl carbamate, and the like can be exemplified.

[0045] The antibacterial ingredients of the above Group X containing these iodoallyl compounds have been known as compounds having high safety and antibacterial properties, and the manufacturing methods of each compound are known, and each compound can be manufactured by various manufacturing methods. If commercially available products of each compound included in the above Group X are available, they can be used.

[0046] In the present application, from the aspects of further safety, stability, and the like, among the above iodoallyl compounds, a compound containing at least 3-iodo-2-propynyl butylcarbamate (hereinafter sometimes referred to as "IPBC") (IPBC alone or a mixture containing IPBC) is preferred, and in addition to the iodoallyl compound, at least one of thibendazole, 2-bromo-2-nitropropane-1,3-diol, phenoxyethanol, terpinen-4-ol, 1,8-eucalyptol, tannic acid, benzalkonium chloride, glycerol fatty acid ester, potassium sorbate, parabens (nipasol butyl, nipasol propyl, nipasol ethyl, nipasol methyl), chloromethyl isothiazolinone, methyl isothiazolinone, and benzisothiazolinone is desirably used.

[0047] The functional particulate dispersion of the present first embodiment is composed of at least the (meth)acrylate monomer represented by the above general formula (I) and at least one antibacterial ingredient selected from the above Group X, and the Zeta potential measurement value of the functional particulate is in the range of -15 to +15 mV, preferably in the range of -10 to +10 mV.

[0048] In the present application (including the examples and the like described later), "the measurement of the Zeta potential of the functional particulate" refers to the value obtained by the following measurement method. The Zeta potential V is a value obtained by measuring at a measurement temperature of 25°C using a Zeta potential measuring machine DT-300 (manufactured by Disoersion Technology, Inc.) and performing arithmetic averaging three times.

[0049] By setting the Zeta potential measurement value of the above functional particulate in the range of -15 to +15 mV, even in a compounding system and the like that is easily affected by ions, the initial state of dispersion stability of the functional particulate can be maintained, the dispersion stability and the stability of the surface tension are excellent, and the functional particulate dispersion that is low in irritation, has a high degree of freedom in compounding design, and can be used for various purposes can be obtained.

[0050] By setting the Zeta potential measurement value of the above functional particles to the range of -15 to +15 mV, even in a compounding system that is easily affected by ions, such as a cellulose nanofiber (a gel formed by a hydrogen bond network of CNF, etc.) and / or a general alkali-swellable emulsion, which is a charge-sensitive polysaccharide fiber and / or the like, the initial state of dispersion stability of the functional particles can be maintained, the dispersion stability and the stability of the surface tension are excellent, and the functional particle dispersion obtained is low in irritation, has a high degree of freedom in compounding design, and can be used for various purposes.

[0051] If the above Zeta potential measurement value is outside the range of -15 to +15 mV, the effects of the present disclosure cannot be exhibited, and if the Zeta potential measurement value is less than -15 mV, the compounding system is greatly changed over time, and is easily dispersed, and on the other hand, if the Zeta potential measurement value exceeds +15 mV, the compounding system is also greatly changed over time, and is easily dispersed, which is not preferred.

[0052] In order to make the above Zeta potential measurement value be in the range of -15 to +15 mV, for example, the above functional particle dispersion is obtained by emulsion polymerization or the like, and by using a nonionic polymerizable surfactant (kind, amount, etc.) as a polymerizable surfactant used at the time of emulsion polymerization, a functional particle dispersion having a prescribed Zeta potential can be obtained.

[0053] In the production of the functional particle dispersion of the present first embodiment, for example, at least one antibacterial component selected from the above X group is dissolved in the above (meth) acrylate monomer (each alone or two or more, the same below), or in a mixed monomer containing the above (meth) acrylate monomer and a hydrophobic vinyl monomer other than this, and the like, ammonium persulfate, potassium persulfate, hydrogen peroxide, or the like is used as a polymerization initiator, or a polymerization initiator further combined with a reducing agent is used, and a nonionic polymerizable surfactant (kind / amount) is used as a polymerizable surfactant, whereby a dispersion of the functional particles having the above Zeta potential measurement value in the range of -15 to +15 mV is obtained.

[0054] As the nonionic polymerizable surfactant which can be used, for example, AQUALON AN-10, AN-20, AN-30, AN-5065 (all of which are polyoxyethylene styrenated propylene phenyl ethers: EO addition mole number 10, 20, 30, 40, 50) manufactured by the first industrial pharmaceutical co., Ltd., Aqualon RN-10, RN-20, RN-30, RN-50 (all of which are polyoxyethylene propylene phenyl ethers (nonyl phenyl based): EO addition mole number 10, 20, 30, 50), LATEMUL PD-420, PD-430, PD-450 (all of which are polyoxyalkylene alkenyl ethers) manufactured by the kawabata co., Ltd., BLEMMER PE-90, PE-200, PE-350 (all of which are PEG monomethacrylate: EO addition mole number 2, 4.5, 8) manufactured by the nissan chemical industries, ltd., BLEMMER AE-200, AE-400 (all of which are PEG monoacrylate: EO addition mole number 4.5, 10), Blemmer PP-1000, PP-500, PP-800 (all of which are PPG monomethacrylate: PO addition mole number 4 to 6, 9, 13), Blemmer AP-200, AP-400, AP-550, AP-800 (all of which are PPG monoacrylate: PO addition mole number 3.5, 6, 9, 13), UNIOX PKA-5001, PKA-5002, PKA-5003, PKA-5004 (all of which are polyethylene glycol-allyl ethers) manufactured by the nissan chemical industries, ltd., UNISAFE PKA-5014F (all of which are polyoxypropylene allyl ethers), ADEKA REASOAP ER-10, ER-20, ER-30, ER-40 (all of which are alkyl type: EO addition mole number 10, 20, 30, 40) manufactured by the adeka corporation, ADEKA REASOAP NE-10, NE-20, NE-30 (all of which are alkyl phenol type: (nonyl phenyl based) EO addition mole number 10, 20, 30), and the like can be listed.

[0055] The amount of use of these nonionic polymerizable surfactants is an amount in which the above-mentioned zeta potential measurement value becomes in the range of -15 to +15 mV, and is adjusted in the range of 0.1 to 50 mass% with respect to the total amount of the monomers, depending on the at least one antibacterial component selected from the above-mentioned group X and the like which is used.

[0056] In the present disclosure (first to third embodiments), by using a nonionic polymerizable surfactant (kind, amount, etc.) as the polymerizable surfactant used in emulsion polymerization, a functional particle dispersion in which the Zeta potential measurement value of the particles is set to the above-mentioned prescribed range is produced, and in the reducing particle dispersion and the antibacterial particle dispersion produced using the anionic polymerizable surfactants described in each of the production examples of the above-mentioned Patent Documents 1 and 2, there are cases in which the above-mentioned prescribed Zeta potential cannot be obtained, the initial state cannot be maintained stably, or the surface tension cannot be maintained stably compared to the initial state, and the effects of the present disclosure cannot be exerted.

[0057] Further, in the present disclosure including the present first embodiment, within a range that does not impair the effects of the present disclosure, emulsion polymerization using a crosslinking agent such as triallylisocyanurate, triallylisocyanurate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, pentaerythritol acrylate, bis(trishydroxymethylpropane) acrylate, dipentaerythritol acrylate, tripentaerythritol acrylate, methoxylated bisphenol A methacrylate, ethoxylated bisphenol A dimethacrylate, pentaerythritol methacrylate, bis(trishydroxymethylpropane) methacrylate, dipentaerythritol methacrylate, tripentaerythritol methacrylate, ethoxylated polyglyceryl methacrylate, allyl methacrylate, 1,4-butanediol diacrylate, and the like, a polyoxyethylene-1-(allyloxymethyl)-alkyl ammonium ether sulfate as needed, an ether sulfate, a polyoxyethylene nonyl acryl phenyl ether ammonium sulfate, a polyoxyethylene nonyl acryl phenyl ether, a polyacrylic acid ammonium, a styrene-maleic acid copolymer ammonium, a polyoxyethylene alkyl ether, a polyoxyethylene styrenated phenyl ether, a polyoxyethylene polyoxypropylene glycol, a polyoxyalkylene decyl ether, a polyoxyethylene tridecyl ether, an alkyl benzene sulfonate, a dioctyl sulfosuccinate, sodium lauryl sulfate, a polyoxyethylene alkyl ether phosphate ester, a polyoxyethylene styrenated phenyl ether phosphate ester, a polyoxyethylene styrenated phenyl ether sulfate, a polyoxyethylene alkyl ether sulfate, a polyoxyethylene sorbitan monolaurate (polysorbate 20), a polyoxyethylene sorbitan palmitate (polysorbate 40), a polyoxyethylene sorbitan monostearate (polysorbate 60), a polyoxyethylene sorbitan oleate (polysorbate 80), and the like, a polymerizable surfactant (emulsifier) can be used to produce emulsion polymerization, and the like, and after a dispersion liquid in which a functional particle dispersion is produced is produced, a functional particle dispersion can be produced by drying, and the like.

[0058] The content of the above-mentioned crosslinking agent such as triallylisocyanurate, and the like, is 0 to 50 mass% with respect to the total amount of the above-mentioned monomers, and is preferably 0.1 to 25 mass%.

[0059] If a cross-linking agent such as the above triallyl isocyanurate is used, the heat resistance, mechanical properties, hydrolysis resistance, and weather resistance of the functional particle dispersion can be improved, and thus it is preferred.

[0060] In the present disclosure including the present first embodiment, during the above emulsion polymerization, an appropriate amount of a dicyclopent(en)yl (meth)acrylate monomer or the like can be further mixed in the above (meth)acrylate monomer or the like, and emulsion polymerization can be performed. In a substance obtained by further mixing the dicyclopent(en)yl (meth)acrylate monomer and performing emulsion polymerization, even if the moisture in the dispersion is volatilized, the stability is not easily impaired, and furthermore, a functional particle dispersion excellent in stability can be obtained.

[0061] The dicyclopent(en)yl (meth)acrylate monomer that can be used includes a dicyclopentyl acrylate monomer, a dicyclopentenyl acrylate, a dicyclopentyl methacrylate monomer, and a dicyclopentenyl methacrylate.

[0062] In the present disclosure including the present first embodiment, during the above emulsion polymerization, in addition to the above (meth)acrylate monomer, the above hydrophobic vinyl monomer other than the above, the above dicyclopent(en)yl (meth)acrylate monomer, and the like, an appropriate amount of a monomer having a reactive cross-linking group such as an epoxy group, a hydroxymethyl amide group, an isocyanate group, and / or a multifunctional monomer having two or more vinyl groups can be compounded and cross-linked.

[0063] In the present disclosure including the present first embodiment, it is desirable that, in the polymer component constituting the above functional particle dispersion, the content of the above (meth)acrylate monomer be 30% by mass or more, preferably 30 to 95% by mass, and further preferably 30 to 70% by mass, with respect to the entire polymer component constituting the functional particle dispersion.

[0064] Note that, in the present disclosure including the present first embodiment, the "entire polymer component" refers to the polymerizable component constituting the functional particle dispersion, and specifically refers to the total amount of the used (meth)acrylate monomer, the used other monomer component, and the cross-linking agent described later.

[0065] By making the content of the above (meth)acrylate monomer 30% by mass or more with respect to the entire polymer component, the effect of the present disclosure can be exerted, and on the other hand, if the content is less than 30% by mass, the stability over time is poor, the desired sustained release is not obtained, and thus it is not preferred.

[0066] In the polymer component constituting the above functional particle dispersion, the content of the other monomer component other than the above (meth)acrylate monomer is the balance of the total amount of the used (meth)acrylate monomer and the cross-linking agent described later.

[0067] From the aspect of further exerting the effect of the present disclosure, the aspect of dispersibility, the aspect of reactivity, it is preferable that the content of the other monomer component be 0.5 to 70 mass% relative to the total polymer component.

[0068] In the present first embodiment, from the aspect of obtaining sufficient antibacterial properties, the aspect of obtaining a sustained antibacterial effect, and the like, the aspect of stability, and the like, it is desirable that the content of the antibacterial component (solid component) selected from the aforementioned Group X be 1 mass% or more, preferably 5 mass% or more, more preferably 10 to 50 mass%, and particularly preferably 15 to 40 mass% relative to the total polymer component.

[0069] By setting the content of the antibacterial component to 1 mass% or more, sufficient antibacterial properties and a sustained antibacterial effect can be exerted, and on the other hand, if the content of the antibacterial component is less than 1 mass%, the antibacterial properties are not sufficient, and the effect of the present disclosure cannot be exerted.

[0070] In the present first embodiment, by the aforementioned preferable means, specifically, by dissolving the antibacterial component selected from the aforementioned Group X in at least the aforementioned (meth)acrylate monomer and performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, and the like), or by dissolving the aforementioned antibacterial component after polymerization of a mixed monomer including at least the aforementioned (meth)acrylate monomer and other monomer components and performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, and the like), a functional particle dispersion (dispersion liquid) in which functional particles having antibacterial properties having the aforementioned prescribed Zeta potential (Zeta potential measurement value in the range of -15 to +15 mV) are dispersed in water is obtained. The production amount of the functional particles in the functional particle dispersion obtained under these production conditions varies depending on the compounding amount of the aforementioned (meth)acrylate monomer, antibacterial component, nonionic polymerizable surfactant, and the like, the polymerization conditions, and the like, and from the viewpoint of manufacturability, workability, efficiency, and the like, it is preferable to produce in an amount of 1 to 50 mass% in terms of solid component amount. It is more preferable to produce in a manner such that the amount in terms of solid component amount is 10 to 40 mass%.

[0071] The functional particle dispersion (dispersion liquid) having antibacterial properties, compared to the case where the aforementioned antibacterial component is used alone, by producing the functional particle dispersion of the present disclosure, the strength and sustainability of the antibacterial properties are obtained, and no adverse effects on other compounding components and the like are caused, and a functional particle dispersion excellent in stability is obtained. In particular, a functional particle dispersion in which the antibacterial effect of the antibacterial component can be maintained or improved even after a long period of time can be obtained.

[0072] The functional particle dispersion (dispersion liquid) can maintain the initial state of dispersion stability even in a compounding system susceptible to ion influence, and / or a compounding system such as an aqueous ink, and the like, and is low in irritation, and even when the functional particle is contained, the design freedom of the compounding system susceptible to ion influence, and the like is large, and can be suitably used for various uses.

[0073] In addition, in the present first embodiment, as the antibacterial component, an oil-soluble (oleophilic) preservative component, and the like are preferably used, and therefore, particularly for a preservative component and the like, the problems such as the attachment to a plastic container, the deterioration of the antibacterial effect including the preservative effect over time, and the like are suppressed by the encapsulation of the antibacterial component in the particle containing the (meth)acrylic component, and the like of the present first embodiment, and therefore, the unique effect of suppressing the attachment to the container wall surface and maintaining the antibacterial effect even over a long period of time is obtained.

[0074] In addition, in the present disclosure including the present first embodiment, the average particle diameter of the functional particle in the obtained functional particle dispersion varies depending on the (meth)acrylic ester monomer, the kind, the content of the other monomer used, the polymerization conditions at the time of polymerization, and the like, and it is desirable that it is preferably 10 to 800 nm, further preferably 20 to 300 nm, and more further preferably 30 to 200 nm.

[0075] By setting the average particle diameter in the above preferable range, further, the storage stability and the like become excellent, and the functional particle in the range suitable for each use described later can be used, and in the case of use in an aqueous ink for a writing tool, the functional particle does not clog in the pen core of a signing pen and / or a marker pen, a ballpoint pen, and the like, and further, the storage stability and the like become excellent.

[0076] Note that the "average particle diameter" prescribed in the present disclosure including the present first embodiment is a histogram average particle diameter based on the scattered light intensity distribution, and in the present disclosure (including the examples described later), it is the value of the value D50 measured by a particle size distribution measuring device [FPAR1000 (Otsuka Electronics Co., Ltd.)]

[0077] In the functional particle dispersion of the present disclosure including the present first embodiment, the content of the functional particle contained in the dispersion is desirably preferably 0.1 to 50% by mass, and further preferably 1 to 30% by mass, based on the solid content, depending on each use and the like described later.

[0078] When the content of the functional particle is less than 0.1% by mass based on the solid content, the effect of the present disclosure cannot be exerted, and on the other hand, when it exceeds 50% by mass, the long-term storage stability is easily reduced.

[0079] The functional particle dispersion body of the first embodiment of the present application thus configured is high in stability and safety, can maintain an initial state of stable dispersion, and is low in irritation, and even if the functional particles are contained, the degree of freedom in design of a compounding system and the like that are susceptible to the influence of ions is large, and can be used to impart antibacterial properties to various products such as medical devices, baby products, nursing products, bath products, kitchen products, tableware, drinking water piping components, sanitary products, home appliances, clothing products, building materials, agricultural materials, automotive interior components, stationery, writing instruments, inkjet printers, and the like.

[0080] The functional particle dispersion body of the first embodiment of the present application thus configured can be used, for example, to impart antibacterial properties to various products such as medical devices, baby products, nursing products, bath products, kitchen products, tableware, drinking water piping components, sanitary products, home appliances, clothing products, building materials, agricultural materials, automotive interior components, stationery, writing instruments, inkjet printers, and the like.

[0081] As specific uses, in addition to the above and the like, for example, it can be suitably used for cleaning agent uses such as laundry detergents, softeners, household detergents, tableware detergents, hard surface detergents, and the like; personal care uses such as shampoos, hair conditioners, cosmetic water, emulsions, creams, sunscreens, foundations, eye makeup products, hair dye products, nail care products, antiperspirants, toothpastes, and the like; industrial water treatment uses such as paints, adhesives, building materials, resin emulsions, wood preservatives, cement admixtures, boilers, cooling equipment, wastewater treatment equipment, industrial water (papermaking process water, cooling water, and / or cleaning water for various industries), and the like; electronic device uses such as medical devices, food additives, solar cell modules, and / or organic element devices, heat radiation shielding films, and the like; and water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, and the like).

[0082] The functional particle dispersion body of the present disclosure is high in stability and safety, is excellent in antibacterial effect of the antibacterial component even after a long period of time, does not affect other compounding components, and further, in a compounding system of a dispersion liquid that is sensitive to charge and / or a compounding system of an aqueous ink, and the like, becomes a functional particle dispersion body that can maintain an initial state of stable dispersion, and thus, as described above, can be used to impart antibacterial properties to various products, and in particular, can be suitably used for cleaning agent uses, personal care uses, industrial water treatment uses, food additives, electronic device uses, water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, and the like), and the like, and for example, the case of an aqueous ink composition for a writing instrument is described below.

[0083] The writing instrument water-based ink composition of the first embodiment is characterized by containing at least the above-described functional particle dispersion having antibacterial properties, and can further contain a colorant, a water-soluble organic solvent, on the basis of the functional particle dispersion.

[0084] From the viewpoint of exerting the effects of the present disclosure without impairing the writing performance, and the viewpoint of storage stability, the content of the functional particles in the ink composition is desirably preferably 0.1 to 30.0% by mass, and further preferably 1.0 to 15.0% by mass, in terms of solid content amount, relative to the total amount of the ink composition.

[0085] As the colorant that can be used, a water-soluble dye, a pigment such as an inorganic pigment, an organic pigment, a plastic pigment, a hollow resin particle having a void inside as a white pigment, or a resin particle dyed with a dye having excellent color development and dispersibility (a simulated pigment), a thermochromic pigment, a photochromic pigment, and the like can also be used.

[0086] As the water-soluble dye, a direct dye, an acid dye, a food dye, and a basic dye can each be used in an appropriate amount without impairing the effects of the present disclosure.

[0087] The content of these colorants varies depending on the type of writing instrument, and the like, and is 1 to 30% by mass, relative to the total amount of the ink composition.

[0088] As the water-soluble organic solvent that can be used, at least one of, for example, ethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 2,3-butanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,5-pentanediol, 2,5-hexanediol, 3-methyl-1,3-butanediol, 2-methylpentane-2,4-diol, 3-methylpentane-1,3,5-triol, 1,2,3-hexanetriol, and the like, an alkylene glycol, a polyalkylene glycol, glycerol, diglycerol, triglycerol, a lower alkyl ether of a glycol such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-butyl ether, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, and the like can be exemplified.

[0089] Further, for example, a water-soluble solvent such as methanol, ethanol, isopropanol, n-butanol, t-butanol, isobutanol, hexanol, octanol, nonanol, decanol, benzyl alcohol, an amide such as dimethylformamide, diethylacetamide, a ketone such as acetone, and the like can also be mixed.

[0090] The content of these water-soluble organic solvents varies depending on the type of writing instrument, such as a signing pen, a marking pen, a ballpoint pen, and the like, and is desirably 1 to 40 mass% relative to the total amount of the ink composition, and is particularly effective for setting to 10 mass% or less from the viewpoint of further improving the line drying property, and is more preferably set to 3 to 8 mass%.

[0091] In the water-based ink composition for a writing instrument of the present first embodiment, in addition to the above-mentioned functional particle dispersion, colorant, water-soluble solvent, and the balance of water (tap water, purified water, distilled water, ion-exchanged water, pure water, and the like) as a solvent, a dispersant, lubricant, pH adjuster, rust preventive, thickener, evaporation inhibitor, surfactant, and the like can be appropriately contained within a range not impairing the effects of the present disclosure.

[0092] As the dispersant that can be used, a nonionic, anionic surfactant, and / or a water-soluble resin can be used. It is preferable to use a water-soluble polymer.

[0093] As the lubricant, a fatty acid ester of a polyol, a higher fatty acid ester of a sugar, a polyoxyalkylene higher fatty acid ester, an alkyl phosphate ester, and the like nonionic, a higher fatty acid amide alkyl sulfonate, an alkyl allyl sulfonate, and the like anionic, a derivative of a polyalkylene glycol, a fluorine-based surfactant, a polyether-modified silicone, and the like can be listed.

[0094] As the pH adjuster, ammonia, urea, monoethanolamine, diethanolamine, triethanolamine, sodium tripolyphosphate, an alkali metal salt of carbonic acid and / or phosphoric acid, a hydrate of an alkali metal such as sodium hydroxide, and the like can be listed. In addition, as the rust preventive, benzotriazole, tolyltriazole, dicyclohexylammonium nitrite, saponin, and the like can be listed.

[0095] As the thickener, carboxymethyl cellulose (CMC) or a salt thereof, fermented cellulose, crystalline cellulose, cellulose nanofiber (CNF), chitin nanofiber, chitosan nanofiber, and the like polysaccharide fiber, and / or an alkali-thickening type thickener such as an alkali-swellable emulsion can be listed.

[0096] The cellulose nanofiber (CNF) is a component that does not easily cause feathering and / or ink accumulation even in a situation of rapid writing and / or left-handed writing, and enables stable writing lines. Even in a compounded system containing CNF, the dispersion of the functional particles can be maintained in a stable initial state, and even in an unstable system (ionic system) of the water-based ink for a writing instrument, the irritability is small, and thus the ink performance is exhibited without impairing sufficient line concentration, and excellent functions such as dispersion stability of the functional particles are exerted.

[0097] Cellulose nanofiber (CNF) is a microfine fiber in which a paper pulp or the like as a cellulose raw material is microfibrillated to a nanometer level, and refers to a microfine fiber having a fiber diameter of about 2 to 500 nm. The cellulose nanofiber can be obtained by microfibrillating a paper pulp, or can be obtained by defibrillating a modified cellulose fiber such as a carboxylated cellulose fiber (also referred to as an oxidized cellulose fiber), a carboxymethylated cellulose fiber, a phosphoric acid esterified cellulose fiber, a phosphorous acid esterified cellulose fiber, and the like.

[0098] As the cellulose nanofiber (CNF) that can be used as the thickening agent, an oxidized cellulose fiber obtained by the above production and / or the above modified cellulose fiber, and the like can be used, and in addition, if there is a commercially available product, it can be used. For example, at least one of Rheocrysta series (for example, Rheocrysta I-2SX, C-2SP, I-2AX, I-2SXS, and the like) manufactured by the First Industrial Pharmaceutical Co., Ltd., BiNFi-s series (for example, FMa-10002, and the like) manufactured by the Sugino Machine Co., Ltd., ELLEX-S, and the like manufactured by the Dae-Wang Paper Mfg. Co., Ltd., and nanoforest-S, and the like manufactured by the Nippon Paper Industries Co., Ltd. can be exemplified.

[0099] The amount of these thickening agents varies depending on the type of writing instrument (ballpoint pen, marker pen, fountain pen, and the like), and desirably, it is preferably 0.1 to 5.0% by mass, and further preferably 0.1 to 3.0% by mass, in terms of the solid content amount, relative to the total amount of the ink composition.

[0100] As the polysaccharide fiber that can be used, for example, xanthan gum, guar gum, hydroxypropylated guar gum, casein, gum arabic, gelatin, amylose, agarose, agar gum, arabinan, gellan gum, callose, carboxymethyl starch, chitin, chitosan, quince seed, glucomannan, gellan gum, tamarind gum, dextran, nigero-poly-saccharide, hyaluronic acid, ceramah, funoran, HM pectin, porphyra polysaccharide, laminarin, lichenin, carrageenan, alginic acid, tragacanth gum, alkasy gum, succinoglycan, locust bean gum, thal gum, and the like can be exemplified.

[0101] As the alkali thickening type thickening agent that can be further used, an alkali swelling type emulsion can be exemplified, and for example, a polyacrylic acid-based thickening agent can be exemplified, and a commercially available product can be used, and for example, "Primal ASE60", "Primal TT615", "Primal RM5" (trade names), manufactured by the Rohm and Haas Co., "RHEOTECH 3800", "RHEOTECH 4800", and the like manufactured by the Arkema Co., and the like can be exemplified.

[0102] They can be used alone 1, or can be used in combination with 2 or more. In addition, if there are commercially available products, they can be used.

[0103] As the evaporation inhibitor, for example, pentaerythritol, p-xylylene glycol, trimethylolpropane, trihydroxyethylpropane, dextrin, etc. can be listed.

[0104] As the surfactant, for example, fluorine-based, silicone-based, acetylenic diol-based, etc. can be listed.

[0105] As the fixing agent, at least one selected from among water-soluble resins having a hydrophobic portion in the molecule, such as polyacrylic acid, water-soluble styrene-acrylic acid resin, water-soluble styrene-maleic acid resin, polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble maleic acid resin, water-soluble styrene resin, polyvinyl pyrrolidone, polyvinyl alcohol, water-soluble ester-acrylic acid resin, ethylene-maleic acid copolymer, polyethylene oxide, water-soluble urethane resin, and resin emulsions such as polyolefin-based emulsion, acrylic-based emulsion, vinyl acetate-based emulsion, urethane-based emulsion, styrene-butadiene emulsion, styrene acrylonitrile emulsion, etc. can be listed, and one or more of each of them, in total 2 or more, is preferably used.

[0106] The writing instrument water-based ink composition of the present first embodiment can be prepared by appropriately combining the above-mentioned functional particle dispersion, water-soluble solvent, and other components according to the purpose of the writing instrument (ballpoint pen, marker, etc.) ink, stirring and mixing them with a homogenizer, a homogenizer, or a disperser, etc., and further removing coarse particles in the ink composition by filtration, centrifugal separation, etc. as needed, according to the purpose of the writing instrument (ballpoint pen, marker, etc.) ink.

[0107] In addition, from the aspects of usability, safety, stability of the ink itself, and compatibility with the ink storage body, it is desirable that the pH (25°C) of the writing instrument water-based ink composition of the present first embodiment is preferably adjusted to 5 to 10 with a pH adjuster, etc., and further preferably set to 6 to 9.5.

[0108] The writing instrument water-based ink composition of the present first embodiment of the present disclosure is mounted on a ballpoint pen, a marker, etc. having a pen tip portion of a ballpoint pen tip, a fiber tip, a felt tip, a plastic tip, etc.

[0109] As the ballpoint pen, a ballpoint pen that stores the above-mentioned writing instrument water-based ink composition in a ballpoint pen ink storage body (pen core) having a ball with a diameter of 0.18 to 2.0 mm, and stores a substance, such as polybutene, silicone oil, mineral oil, etc. that has no compatibility with the water-based ink composition stored in the ink storage body and has a specific gravity less than that of the water-based ink composition, as an ink follower can be listed.

[0110] Note that the structure of the ballpoint pen and the marker pen is not particularly limited, and for example, can be a straight liquid type ballpoint pen or marker pen having a collector structure (ink retaining mechanism) in which the shaft cylinder itself serves as an ink storage body and is filled with the above-described writing instrument water-based ink composition.

[0111] In the writing instrument water-based ink composition of the first embodiment thus configured, since the functional particle dispersion having the above-described antibacterial property used is compounded in the writing instrument water-based ink composition, the strength and persistence of the antibacterial property in the ink composition are maintained, and no adverse effects are caused on other compounded components and the like, so the persistent effect is long-lasting, and these particles do not impair the storage stability and the writing performance, and thus the degree of freedom of ink design can be further improved, and a writing instrument water-based ink composition suitable for a writing instrument such as a ballpoint pen or a marker pen can be obtained.

[0112] In addition, the zeta potential measurement value of the functional particle having the above-described antibacterial property in the dispersion used in the writing instrument water-based ink composition of the first embodiment is set to a prescribed range, and thus even in a compounding system of an ionic water-based ink and the like in which a polysaccharide fiber such as cellulose nanofiber (a gel based on a hydrogen bond network of CNF and the like) is used as a thickening agent for the ink of the writing instrument, the initial state of the dispersion stability of the functional particle can be maintained, and even in a compounding system of an unstable water-based ink such as an ionic system, the irritation is less, and thus the sufficient line density is not impaired, and a writing instrument water-based ink composition having excellent dispersion stability can be obtained.

[0113] In the above, the case in which the functional particle dispersion of the first embodiment is used in a writing instrument water-based ink composition is described, but the functional particle dispersion of the first embodiment is excellent in the antibacterial effect of the antibacterial component even after a long period of time, and is high in safety, and by selecting the antibacterial component used, a wide antibacterial spectrum can be obtained, no adverse effects are caused on other compounded components, the compounded properties, and the like, the stability is excellent, and in addition, the above-described cleaning agent use, personal care use, industrial water treatment use, food additive, electronic device use, water tank and medicated bath use for water mold suppression of aquatic organisms (fish and the like) can be implemented at a suitable compounding ratio.

[0114] (Functional particle dispersion of the second embodiment)

[0115] The functional particle dispersion of the second embodiment is characterized in that a functional particle composed of at least a (meth)acrylate monomer represented by the above general formula (I), at least one antibacterial component selected from the above Group X, and at least one perfume component is dispersed in water, and that the Zeta potential of the functional particle is in the range of -15 to +15 mV.

[0116] The functional particle dispersion of the second embodiment differs from the functional particle dispersion of the above first embodiment in that a functional particle composed of a (meth)acrylate monomer represented by the above general formula (I) and at least one antibacterial component selected from the above Group X, and further at least one perfume component is used. The kind of the (meth)acrylate monomer represented by the above general formula (I) and the content thereof, and the kind of at least one antibacterial component selected from the above Group X and the content thereof are the same as those described in detail in the functional particle dispersion of the above first embodiment, and thus the description thereof is omitted.

[0117] As the perfume component used in the second embodiment, at least one of, for example, a terpene-based perfume compound, an alcohol-based perfume compound, a hydrocarbon-based perfume compound, a phenol-based perfume compound, an ester-based perfume compound, a carbonate-based perfume compound, an aldehyde-based perfume compound, a ketone-based perfume compound, an acetal-based perfume compound, an ether-based perfume compound, a carboxylic acid-based perfume compound, a lactone-based perfume compound, a nitrile-based perfume compound, a Schiff base-based perfume compound, a natural essential oil and / or a natural extract, and the like can be exemplified.

[0118] In the present specification, the "perfume compound" of each perfume refers to a single compound or a mixture of two or more compounds.

[0119] As the terpene-based perfume compound that can be used, a monoterpene having 10 carbon atoms and a derivative thereof (including a compound having 10 or more carbon atoms), and the like can be exemplified, and further, any one or more of a terpene-based hydrocarbon, a terpene-based alcohol, and a terpene-based ester is preferable. Here, the monoterpene refers to a perfume compound having 10 carbon atoms including two isoprene units, and there are chain (acyclic) monoterpene and cyclic monoterpene including a ring. Furthermore, the terpene-based perfume in the present disclosure also includes a terpene-based hydrocarbon, a terpene-based alcohol, a terpene-based ester, and a terpene-based aldehyde.

[0120] The terpene-based perfume used is not particularly limited as long as it is a perfume compound or a derivative thereof having isoprene as a constituent unit, and can be appropriately selected according to the purpose, and for example, chain monoterpene such as ocimene, myrcene, chrysanthemum monoterpene, citral, citronellal, citronellol, linalool, monocyclic monoterpene such as limonene, menthane, pinene, phellandrene, terpinolene, cymene, bicyclic monoterpene such as α-pinene, β-pinene, camphene, carene, sabinene, cedrene, and the like can be exemplified.

[0121] Among these terpene-based perfumes, preferable are limonene, pinene, myrcene, carene, terpinolene, camphene, and the like terpene-based hydrocarbons, geraniol, citronellol, linalool, nerol, terpinenol, and the like terpene-based alcohols, linalyl acetate, terpinyl acetate, geranyl acetate, neryl acetate, citronellyl acetate, isobornyl acetate, and the like terpene-based esters, citronellal, citral, neral, perilla aldehyde, and the like terpene-based aldehydes.

[0122] As the alcohol-based perfume compounds, aliphatic alcohols, terpene-based alcohols, aromatic alcohols, other alcohols, and the like can be exemplified. Among these, aliphatic alcohols are preferable.

[0123] As the aromatic alcohol-based perfume compounds, phenyl ethanol, benzyl alcohol, dimethylbenzyl carbinol, dimethylphenethyl carbinol, phenyl hexanol, and the like can be exemplified.

[0124] As the aliphatic alcohol-based perfume compounds, cis-3-hexenol, l-(2,2,6-trimethylcyclohexyl)-3-hexanol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-l-yl)-2-buten-l-ol, ethyl norbornyl cyclohexanol, 4-methyl-3-decen-5-ol, isobornyl cyclohexanol, and the like can be exemplified.

[0125] As the other alcohol-based perfume compounds, diols such as dipropylene glycol, 4-methyl-2-(2-methylpropyl)tetrahydro-2H-4-pyranol, and the like can be exemplified.

[0126] As the phenol-based perfume compounds, guaiacol, eugenol, dihydrosyugenol, isoeugenol, thymol, p-cresol, vanillin, ethyl vanillin, and the like can be exemplified.

[0127] As the ester-based perfume compounds, aliphatic carboxylic acid esters, aromatic carboxylic acid esters, other carboxylic acid esters, and the like can be exemplified.

[0128] As the aliphatic carboxylic acid forming the aliphatic carboxylic acid ester, straight-chain and branched carboxylic acids having 1 to 18 carbon atoms can be exemplified, and among these, carboxylic acids having 1 to 6 carbon atoms such as formic acid, acetic acid, propionic acid, and the like are preferable, and acetic acid is particularly preferable. As the aromatic carboxylic acid forming the aromatic carboxylic acid ester, benzoic acid, anisic acid, phenylacetic acid, cinnamic acid, salicylic acid, anthranilic acid, and the like can be exemplified. As the alcohol forming the aliphatic and aromatic ester, straight-chain and branched aliphatic alcohols having 1 to 5 carbon atoms and the above-mentioned alcohol-based perfume components can be exemplified.

[0129] As the formic acid ester, linalyl formate, citronellyl formate, geranyl formate, and the like can be exemplified.

[0130] As the acetate ester, ethyl acetate, isoamyl acetate (isoamyl acetate), benzyl acetate, hexyl acetate, cis-3-hexenyl acetate, linalyl acetate, citronellyl acetate, geranyl acetate, neryl acetate, terpinyl acetate, nopol acetate, borneol acetate, isoborneol acetate, eugenol acetate, isoeugenol acetate, o-tert-butylcyclohexyl acetate, p-tert-butylcyclohexyl acetate, tricyclodecenyl acetate, benzyl acetate, phenylethyl acetate, styrallyl acetate, cinnamyl acetate, dimethylbenzylcarbinyl acetate, phenylethyl phenyl acetate, 3-pentyltetrahydropyran-4-yl acetate, p-cresyl phenylacetate, and the like can be exemplified.

[0131] As the propionate ester, citronellyl propionate, tricyclodecenyl propionate, allylcyclohexyl propionate, ethyl 2-cyclohexyl propionate, benzyl propionate, styrallyl propionate, and the like can be exemplified.

[0132] As the butyrate ester, citronellyl butyrate, dimethylbenzylcarbinyl n-butyrate, tricyclodecenyl isobutyrate, and the like can be exemplified. As the valerate ester, methyl valerate, ethyl valerate, butyl valerate, amyl valerate, benzyl valerate, phenylethyl valerate, and the like can be exemplified; as the hexanoate ester, methyl hexanoate, ethyl hexanoate, allyl hexanoate, linalyl hexanoate, citronellyl hexanoate, and the like can be exemplified. As the heptanoate ester, methyl heptanoate, allyl heptanoate, and the like can be exemplified. As the nonanoate ester, methyl 2-nonanoate, ethyl 2-nonanoate, ethyl 3-nonanoate, and the like can be exemplified.

[0133] As the benzoate ester, methyl benzoate, benzyl benzoate, 3,6-dimethylbenzoate, and the like can be exemplified. As the cinnamate ester, methyl cinnamate, benzyl cinnamate, and the like can be exemplified. As the salicylate ester, methyl salicylate, n-hexyl salicylate, cis-3-hexenyl salicylate, cyclohexyl salicylate, benzyl salicylate, and the like can be exemplified. Further, as the brassylate ester, ethylene glycol brassylate, and the like can be exemplified. As the tiglate ester, geranyl tiglate, 1-hexyl tiglate, cis-3-hexenyl tiglate, and the like can be exemplified. As the jasmonate ester, methyl jasmonate, methyl dihydrojasmonate, and the like can be exemplified. As the glycidate ester, methyl 2,4-dihydroxy-ethylmethylphenyl glycidate, 4-methylphenylethyl glycidate, and the like can be exemplified. As the anthranilate ester, methyl anthranilate, ethyl anthranilate, dimethyl anthranilate, and the like can be exemplified. As the glycolate ester, allylcyclohexyl glycolate, and the like can be exemplified. Further, as other esters, ethyl dihydrocyclohexylpropanoate, ethyl tricyclo[5.2.1.02,6]decane-2-carboxylate, methyl jasmonate, methyl dihydrojasmonate, (2-pentyl-3-oxocyclopentyl) methyl acetate, and the like can be exemplified. 2.6

[0134] ​As the carbonate-based perfume compounds, cis-3-hexenyl methyl carbonate, methyl-cyclooctyl carbonate, ethyl-2-tert-butylcyclohexyl carbonate, and the like can be given.

[0135] As the aldehyde-based perfume compounds, n-octanal, n-nonyl aldehyde, n-decanal, n-dodecanal, 2-methylundecanal, 10-undecenal, citronellal, citral, hydroxycitronellal, 2,4-dimethyl-3-cyclohexen-1-carboxaldehyde, dimethyl-3-cyclohexen-1-carboxaldehyde, benzaldehyde, phenylacetaldehyde, phenylpropylaldehyde, cinnamic aldehyde, dimethyltetrahydrobenzaldehyde, 3-(4-tert-butylphenyl)propanal, hydroxycitronellal, 2-cyclohexylpropanal, p-tert-butyl-α-methylhydrocinnamic aldehyde, p-isopropyl-α-methylhydrocinnamic aldehyde, 3-(o-(and p-)-ethylphenyl)-2,2-dimethylpropanal, α-amylcinnamic aldehyde, α-hexylcinnamic aldehyde, heliotropin, α-methyl-1,3-benzodioxole-5-propanal, 2-methyl-3-(p-methoxyphenyl)propanal, and the like can be given.

[0136] As the ketone-based perfume compounds, methylheptenone, dimethyloctenone, 3-octanone, hexylcyclopentanone, dihydrojasmone, 2,2,5-trimethyl-5-pentylcyclopentanone, 2-(2-(4-methyl-3-cyclohexen-1-yl)propyl)cyclopentanone, ionone, β-ionone, methylionone, methylionone-G, γ-methylionone, musk ketone, α-musk ketone, β-musk ketone, δ-musk ketone, 1-(2,4,4-trimethyl-2-cyclohexyl)-trans-2-butanone, muscenone, 1-(5,5-dimethyl-1-cyclohexen-1-yl)-4-penten-1-one, irisone, 1,2,3,5,6,7-hexahydro-1,1,2,3,3-pentamethyl-4H-inden-4-one, 1-(1,2,3,4,5,6,7,8-octahydro-2,3,8,8-tetramethyl-2-naphthyl)-1-ethanone, 7-methyl-3,4-dihydro-2H-benzodioxepin-3-one, carvone, menthone, methylcedryl ketone, isolongifolanone, cembrene, benzylacetone, raspberry ketone, benzophenone, 6-acetyl-1,1,2,4,4,7-hexamethyltetralin, β-methylnaphthyl ketone, ethyl maltol, camphor, muscone, 3-methyl-5-cyclopentadecen-1-one, civetone, 8-cyclohexadecenone, methyl nonanone, cis-jasmone, p-amylcyclohexanone (4-pentylcyclohexanone), and the like can be given.

[0137] As the acetals, acetaldehyde ethylphenylpropyl acetal, citral diethyl acetal, phenylacetaldehyde glycerol acetal, ethyl acetoacetate ethylene glycol acetal, and the like can be given.

[0138] As the ether-based flavoring compound, ethyl linalool, methyl cedryl ether, estragol, anethole, β-naphtyl methyl ether, β-naphtyl ethyl ether, limonene oxide, rose oxide, nerol oxide, 1,8-cineol, rose furan, [3aR-(3aα, 5aβ, 9aα, 9bβ)] dodecahydro-3a, 6, 6, 9a-tetramethylnaphtho[2, 1-b]furan, 3, 3, 5-trimethylcyclohexyl ethyl ether, hexamethylhexahydrocyclopentabenzopyran, phenylacetaldehyde dimethyl acetal, and the like can be exemplified.

[0139] As the carboxylic acid-based flavoring compound, benzoic acid, phenylacetic acid, cinnamic acid, hydrocinnamic acid, butyric acid, 2-hexenoic acid, and the like can be exemplified.

[0140] As the lactone-based flavoring compound, hecogenin, γ-decalactone, δ-decalactone, γ-valerolactone, γ-nonalactone, γ-undecalactone, δ-hexalactone, γ-jasmolactone, whiskey lactone, coumarin, cyclotetradecanolide, cyclopentadecanolide, 11-oxacyclohexadecanolide, butenylphthalide, and the like can be exemplified.

[0141] As the nitrile-based flavoring compound, tridec-2-enenitrile, citronitrile, citronellylnitrile, dodecanenitrile, and the like can be exemplified.

[0142] As the Schiff base-based flavoring compound, nerolin, ligantraal, and the like can be exemplified.

[0143] As the natural essential oil and / or natural extract, orange, lemon, lime, bergamot, lavender, mandarin, peppermint, spearmint, lavender, chamomile, rosemary, eucalyptus, sage, basil, rose, rockrose, geranium, jasmine, ylang-ylang, anise, clove, ginger, nutmeg, cardamom, cedar, cypress, vetiver, patchouli, lemon grass, lemongrass, grapefruit, elemi oil, and the like can be exemplified.

[0144] Among these flavoring components, at least one selected from the following Group Y is further preferred from the viewpoint of the strength of the remaining scent, the adverse effect on the antibacterial component to be enclosed, and the ease of production.

[0145] Y group: borneol, eugenol, pinene-4-ol, 1,8-cineole, d-limonene, citral R, geraniol, vanillin, 2-phenylethanol, gamma-decalactone, linalool, L- perillaldehyde, raspberry ketone, DL-camphor, L-carvyl acetate, Aryophyllene, L- myrcenol, D-dihydrocarveol, L-dihydrocarveol, dihydroterpineol, dihydroterpineol acetate, linalool oxide, myrtenyl acetate, allyl isothiocyanate, L-carveol, caryophyllene oxide, 1,4-cineole, p-cymene, D-dihydrocarveone, L- dihydrocarveone, D-dihydrocarveyl acetate, L-dihydrocarveyl acetate, elemol, isobornyl acetate, L-limonene, D-limonene oxide, L-limonene oxide, linalool oxide, p- menthane, L-menthol, menthone-90, myrtenal, myrtenol, 3-octyl acetate, L- perillyl alcohol, L-perillyl acetate, alpha-pinene, beta-pinene, D-menthone, alpha- terpinene, terpinenol C, alpha-terpineol, L-alpha-terpineol, terpinen-4-ol, terpinolene, alpha-terpinyl acetate, verbenol, verbenone, 3-carene, carene oxide, hexyl acetate, nerol, ethyl safranate, eugenyl acetate, piperonyl alcohol, estragole, anethole, pyrethrin, gamma-terpinene, p-cymene, myrcene, phellandrene, farnesene, thujene.

[0146] The above-mentioned flavor ingredient of the Y group can contain a flavor-acceptable solvent. Solvents are used as diluents in the flavor industry in order to dilute olfactorily powerful ingredients, to dissolve solid ingredients, to make the handling of solid ingredients easier as liquid treatments, or to reduce the cost of the overall flavor per unit mass. Typically, appropriate solvents are water-soluble solvents such as glycols represented by propylene glycol, dipropylene glycol, and butylene glycol, and / or solvents that do not mix with water, for example, solvents having a water solubility of less than 10 g / L. Examples of flavor-acceptable solvents are water-insoluble carbohydrate solvents (for example, the Isopar (registered trademark) series available from ExxonMobil), benzyl benzoate, isopropyl myristate, benzyl salicylate, dialkyl adipate, citrate esters (for example, acetyl triethyl citrate and acetyl tributyl citrate), and diethyl phthalate, hydrogenated methyl rosin. Where present, water-miscible solvents (for example, solvents having a water solubility of more than 10 g / 100 mL), such as propylene glycol, dipropylene glycol, and butylene glycol, should be added at the lowest possible concentration.

[0147] Among the above-mentioned Y group, as particularly preferable flavor ingredients, from the viewpoint of stability over time, workability in production, and safety, it is desirable that the flavor ingredient is borneol, eugenol, myrcene-4-ol, 1,8-cineole, D-limonene, citral, geraniol, vanillin, 2-phenylethanol, gamma-decalactone, linalool, L- perilla aldehyde, DL-camphor, L-carvyl acetate, Aryophyllene, L- citronellol, linalool oxide, myrtenyl acetate, allyl isothiocyanate, 1,4- cineole, isobornyl acetate, D-limonene, linalool oxide, L-menthol, 3- octyl acetate, L-perilla alcohol, L-perilla acetate, alpha-pinene, beta- pinene, alpha-mycene, terpinen-4-ol, nerol, ethyl saffronate, eugenyl acetate, piperonyl alcohol, estragole, anethole, azulene, gamma- myrcene, p-cymene, myrcene, phellandrene, farnesene, thujene, from the viewpoint of ease of encapsulation in the aromatic particles, the solubility in water is desirably 10% by mass or less, preferably 5% by mass or less, and further preferably 3% by mass or less.

[0148] The flavor ingredient of the above-mentioned Y group can be any one of a natural flavor or a synthetic flavor, or a mixture thereof. Furthermore, in addition to the above-mentioned Y group, a flavor ingredient described in "Synthetic Flavor Chemistry and Product Knowledge" (Gendai Kagaku Sha) can be included within a range that does not interfere with the effects of the present disclosure.

[0149] In the functional particle dispersion of the second embodiment, the functional particles composed of at least the (meth)acrylate monomer represented by the general formula (I) described in the first embodiment, at least one antibacterial ingredient selected from the X group described in the first embodiment, and at least one flavor ingredient described above are dispersed in water, and the Zeta potential measurement value of the functional particles is in the range of -15 to +15 mV, and preferably in the range of -10 to +10 mV, as with the functional particles of the first embodiment.

[0150] By setting the Zeta potential measurement value of the above-mentioned functional particles in the range of -15 to +15 mV, even if a compounding system that is susceptible to the influence of ions, and / or a compounding system of a charge-sensitive water-based ink using a polysaccharide fiber such as cellulose nanofiber (a gel based on a hydrogen bond network of CNF, etc.) as a thickening agent, and / or a basic thickening type thickening agent such as an alkali-swellable emulsion, the dispersion of the functional particles can maintain a stable initial state, the dispersion stability and the stability of the surface tension are excellent, and it is low in irritation, the degree of freedom in compounding design is large, and thus a functional particle dispersion that can be used for various purposes can be obtained.

[0151] If the Zeta potential measurement value is outside the range of -15 to +15 mV, the effects of the second embodiment cannot be exhibited, and if the Zeta potential measurement value is less than -15 mV, the increase or decrease of the compounding system over time becomes large, and dispersion becomes poor, and on the other hand, if the Zeta potential measurement value exceeds +15 mV, the increase or decrease of the compounding system over time also becomes large, and dispersion becomes poor, and thus is not preferable.

[0152] In order to make the Zeta potential measurement value be in the range of -15 to +15 mV, for example, the functional particles are obtained by emulsion polymerization or the like, and by using a nonionic polymerizable surfactant (kind, amount, etc.) as the polymerizable surfactant used at the time of emulsion polymerization, a functional particle dispersion having a prescribed Zeta potential can be obtained.

[0153] In the production of the functional particle dispersion of the second embodiment, for example, at least one antibacterial component selected from the X group and at least one perfume component are dissolved in the (meth)acrylate monomer (each alone or two or more, the same hereinafter) or in a mixed monomer containing the (meth)acrylate monomer and a hydrophobic vinyl monomer other than the same, using ammonium persulfate, potassium persulfate, hydrogen peroxide or the like as a polymerization initiator, or a polymerization initiator further combined with a reducing agent, and using a nonionic polymerizable surfactant (kind / amount) as a polymerizable surfactant, whereby a dispersion of functional particles having a Zeta potential measurement value in the range of -15 to +15 mV is obtained.

[0154] The nonionic polymerizable surfactant and / or the amount thereof that can be used is the same as in the first embodiment, and is an amount in which the Zeta potential measurement value becomes in the range of -15 to +15 mV, and varies depending on the at least one antibacterial component selected from the X group or the like used, and is desirably 0.1 to 50 mass%, and preferably 5 to 50 mass% with respect to the total amount of the monomers.

[0155] Further, in the present second embodiment, in a range not impairing the effects of the present second embodiment, as in the above first embodiment, emulsion polymerization or the like can be performed by using a cross-linking agent such as triallyl isocyanurate, triallyl isocyanurate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, pentaerythritol acrylate, bis(trishydroxy methylpropane) acrylate, di-pentaerythritol acrylate, tri-pentaerythritol acrylate, methoxylated bisphenol A methacrylate, ethoxylated bisphenol A dimethacrylate, pentaerythritol methacrylate, bis(trishydroxy methylpropane) methacrylate, di-pentaerythritol methacrylate, tri-pentaerythritol methacrylate, ethoxylated polyglyceryl methacrylate, allyl methacrylate, 1,4-butanediol diacrylate, or the like, an ammonium polyoxyethylene-1-(allyloxymethyl)-alkyl ether sulfate as needed, an ether sulfate, an ammonium polyoxyethylene nonyl acryl phenyl ether sulfate, an ammonium polyoxyethylene nonyl acryl phenyl ether, an ammonium polyacrylate, an ammonium styrene-maleic acid copolymer, a polyoxyethylene alkyl ether, a polyoxyethylene styrenated phenyl ether, a polyoxyethylene polyoxypropylene glycol, a polyoxyalkylene decyl ether, a polyoxyethylene tridecyl ether, an alkyl benzene sulfonate, a dioctyl sulfosuccinate, sodium lauryl sulfate, a polyoxyethylene alkyl ether phosphate, a polyoxyethylene styrenated phenyl ether phosphate, a polyoxyethylene styrenated phenyl ether sulfate, a polyoxyethylene alkyl ether sulfate, a polyoxyethylene sorbitan monolaurate (polysorbate 20), a polyoxyethylene sorbitan monopalmitate (polysorbate 40), a polyoxyethylene sorbitan monostearate (polysorbate 60), a polyoxyethylene sorbitan monooleate (polysorbate 80), or the like, a polymerizable surfactant (emulsifier), and the like, and after a dispersion liquid in which a functional particle dispersion is successfully manufactured is obtained, a functional particle dispersion can be manufactured by drying or the like.

[0156] The content of the above cross-linking agent such as triallyl isocyanurate or the like is 0 to 50 mass% with respect to the total amount of the above monomers, and is preferably 0.1 to 25 mass%.

[0157] If the above cross-linking agent such as triallyl isocyanurate or the like is used, the heat resistance, mechanical properties, hydrolysis resistance, and weather resistance of the functional particle dispersion can be improved, and thus is preferable.

[0158] In the present second embodiment, as in the above first embodiment, during the above emulsion polymerization, an appropriate amount of a (meth)acrylic dicyclopent(en)yl ester monomer or the like can be further mixed in the above (meth)acrylate monomer or the like, and emulsion polymerization can be performed. In a substance obtained by further mixing the (meth)acrylic dicyclopent(en)yl ester monomer and performing emulsion polymerization, even if moisture in the dispersion liquid evaporates, the stability is not easily impaired, and further, a functional particle dispersion with excellent stability can be obtained.

[0159] The dicyclopent(en)yl (meth)acrylate monomers that can be used include dicyclopentyl acrylate monomers, dicyclopentenyl acrylate, dicyclopentyl methacrylate monomers, dicyclopentenyl methacrylate.

[0160] In addition, in the present second embodiment, at the time of the above-mentioned emulsion polymerization, on the basis of the above-mentioned (meth)acrylate monomers, the above-mentioned hydrophobic vinyl monomers other than the above-mentioned (meth)acrylate monomers, and the above-mentioned (meth)acrylate dicyclopent(en)yl monomers, a suitable amount of a monomer having a reactive crosslinking group such as an epoxy group, a hydroxymethylamide group, an isocyanate group, and a multifunctional monomer having two or more vinyl groups can be compounded to perform crosslinking.

[0161] In the present second embodiment, in the polymer component constituting the above-mentioned functional particle dispersion, it is desirable that the content of the above-mentioned (meth)acrylate monomers be 30% by mass or more, preferably 30 to 95% by mass, and further preferably 30 to 70% by mass, relative to the entire polymer component constituting the functional particle dispersion.

[0162] Note that, in the present second embodiment, the "entire polymer component" refers to the polymerizable component constituting the functional particle dispersion, and specifically refers to the total amount of the used (meth)acrylate monomers, the used other monomer components, and the crosslinking agent described later.

[0163] By making the content of the above-mentioned (meth)acrylate monomers 30% by mass or more relative to the entire polymer component, the effects of the present disclosure can be exerted, and on the other hand, if the content is less than 30% by mass, the stability over time is poor, and this is not preferred.

[0164] In the polymer component constituting the above-mentioned functional particle dispersion, the content of the other monomer components other than the above-mentioned (meth)acrylate monomers is the balance of the total amount of the used (meth)acrylate monomers and the crosslinking agent described later.

[0165] From the aspect of further exerting the effects of the present disclosure, the aspect of dispersibility, and the aspect of reactivity, it is preferred that the content of the other monomer components be 0.5 to 70% by mass relative to the entire polymer component.

[0166] In the present second embodiment, from the aspect of obtaining sufficient antibacterial properties, the aspect of obtaining a sustained antibacterial effect, and the like, and the aspect of stability, it is desirable that the content of the above-mentioned antibacterial component (solid component) be 1% by mass or more, preferably 5% by mass or more, more preferably 10 to 50% by mass, and particularly preferably 15 to 40% by mass, relative to the entire polymer component.

[0167] By setting the content of the antibacterial component to 1% by mass or more, sufficient antibacterial performance and sustained antibacterial effect can be exerted. On the other hand, if the content of the antibacterial component is less than 1% by mass, the antibacterial performance is insufficient, and the effects of the present disclosure cannot be exerted.

[0168] In addition, in the present second embodiment, from the viewpoint of obtaining sufficient fragrance performance, obtaining a sustained fragrance effect, stability, and the like, it is desirable that the content of the above-mentioned perfume component (solid component) be 1% by mass or more, preferably 5% by mass or more, more preferably 10 to 50% by mass, and particularly preferably 15 to 40% by mass, with respect to the total polymer component.

[0169] By setting the content of the perfume component to 1% by mass or more, sufficient fragrance performance and a sustained fragrance effect can be exerted. On the other hand, if the content of the perfume component is less than 1% by mass, the fragrance performance is insufficient, and the effects of the present second embodiment cannot be exerted.

[0170] In the present second embodiment, by the above-mentioned preferred means, specifically, by dissolving the antibacterial component selected from the above-mentioned Group X and at least one perfume component in the above-mentioned (meth)acrylate monomer and performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, and the like), or by dissolving the above-mentioned antibacterial component and perfume component after polymerization of a mixed monomer containing at least the above-mentioned (meth)acrylate monomer and other monomer components and performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, and the like), a functional particle dispersion (dispersion liquid) in which functional particles having antibacterial properties and fragrance performance having a prescribed Zeta potential (Zeta potential measurement value in the range of -15 to +15 mV) are dispersed in water is obtained. The manufacturing amount of the functional particles having antibacterial properties and fragrance performance in the functional particle dispersion obtained under these manufacturing conditions varies depending on the compounding amount of the above-mentioned (meth)acrylate monomer, antibacterial component, perfume component, nonionic polymerizable surfactant, and the like, the polymerization conditions, and the like, and from the viewpoints of manufacturability, workability, efficiency, and the like, it is preferable to manufacture in an amount of 1 to 50% by mass in terms of solid component amount. More preferably, it is manufactured in a manner so as to become 10 to 40% by mass in terms of solid component amount.

[0171] The functional particle dispersion (dispersion liquid) having antibacterial properties and fragrance performance, compared to the case where the above-mentioned antibacterial component and perfume component are used alone, by being made into the functional particle dispersion of the second embodiment, has strength of antibacterial performance and sustainability of fragrance performance, and does not cause adverse effects on other compounding components and the like, and becomes a functional particle dispersion excellent in stability. In particular, a functional particle dispersion in which the antibacterial effect of the antibacterial component and the fragrance performance can be maintained or improved even after a long period of time can be obtained.

[0172] The functional particle dispersion (dispersion liquid) can maintain the initial state of dispersion stability even in a compounding system that is easily affected by ions, a water-based ink, and the like, and has excellent dispersion stability, stability of surface tension, and low irritation, and thus has a large degree of freedom in compounding design, and can be used for various purposes.

[0173] In addition, in the present second embodiment, as the antibacterial component, an oil-soluble (lipophilic) antiseptic component or the like is preferably used, and thus, particularly for an antiseptic component or the like that is easily attached to a plastic container, the antibacterial effect including the antiseptic effect is deteriorated over time, and the like, by using the antibacterial component and the perfume component inside the particle including the (meth)acrylic component or the like of the present second embodiment, the attachment to the container wall surface is suppressed, and the antibacterial effect and the fragrance performance can be maintained even after a long period of time.

[0174] In addition, in the present second embodiment of the present disclosure, the average particle diameter of the functional particles in the obtained functional particle dispersion varies depending on the (meth)acrylic ester monomer, the kind, the content of the other monomers used, the polymerization conditions at the time of polymerization, and the like, and as in the above-described first embodiment, it is desirable that the average particle diameter be preferably 10 to 800 nm, further preferably 20 to 300 nm, and further preferably 30 to 200 nm.

[0175] By setting the average particle diameter to the above-described preferable range, further, the storage stability and the like become excellent, and the functional particles that become the average particle diameter suitable for each use described below can be used, and in the case of being used for a water-based ink for a writing tool, the functional particles do not clog the ink cartridge of the writing tool such as a signature pen, a marker pen, a ballpoint pen, and the like, and further, the storage stability and the like become excellent.

[0176] In the functional particle dispersion of the present second embodiment, the content of the functional particles contained in the dispersion is desirably preferably 0.1 to 50% by mass, and further preferably 1 to 30% by mass, in terms of the solid content amount, depending on each use described below and the like.

[0177] When the content of the functional particles is less than 0.1% by mass in terms of the solid content amount, the effect of the present disclosure cannot be exerted, and on the other hand, when it exceeds 50% by mass, the long-term storage stability easily deteriorates.

[0178] The functional particle dispersion body of the second embodiment thus configured has high stability and safety, can maintain the initial state of dispersion stability, and has excellent dispersion stability, stability of surface tension, and low irritation, and has a high degree of freedom in compounding design, and can impart antibacterial properties to various products such as medical devices, baby products, nursing products, bath products, kitchen products, tableware, drinking water piping components, sanitary products, home appliances, clothing products, building materials, agricultural materials, automotive interior components, stationery, writing tools, ink compositions for inkjet printers, and the like.

[0179] The functional particle dispersion body of the second embodiment thus configured can be used, for example, to impart antibacterial properties and fragrance properties to various products such as medical devices, baby products, nursing products, bath products, kitchen products, tableware, drinking water piping components, sanitary products, home appliances, clothing products, building materials, agricultural materials, automotive interior components, stationery, writing tools, ink compositions for inkjet printers, and the like.

[0180] As specific uses, in addition to the above and the like, it can be suitably used, for example, for cleaning agent uses such as detergents, softeners, household detergents, tableware cleaners, hard surface cleaners, and the like; personal care uses such as shampoos, hair conditioners, cosmetic water, emulsions, creams, sunscreens, foundations, eye makeup products, hair dye products, nail care products, antiperspirants, toothpaste, and the like; industrial water treatment uses such as paints, adhesives, building materials, resin emulsions, wood preservatives, cement mixers, boilers, cooling equipment, wastewater treatment equipment, industrial water (papermaking process water, cooling water, cleaning water for various industries), and the like; electronic device uses such as medical devices, food additives, solar cell modules, organic element devices, heat radiation shielding films, and the like; and as water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, etc.).

[0181] The functional particle dispersion body of the second embodiment has high stability and safety, excellent antibacterial effects and fragrance properties of the antibacterial component over time, and does not affect other compounding components, and can maintain the initial state of dispersion stability in compounding systems of dispersion liquids sensitive to charge, compounding systems of water-based inks, and the like, and is a functional particle dispersion body with excellent dispersion stability, stability of surface tension, and the like, and thus, as described above, can be used to impart antibacterial properties to various products, and in particular, can be suitably used for cleaning agent uses, personal care uses, industrial water treatment uses, food additives, electronic device uses, water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, etc.), and the like. For example, the following describes a case of a water-based ink composition for writing tools.

[0182] The writing instrument water-based ink composition of the present second embodiment is characterized by containing at least the functional particle dispersion having antibacterial and aromatic properties described above, and can further contain a colorant, a water-soluble organic solvent, on the basis of the functional particle dispersion.

[0183] From the viewpoint of exerting the effects of the present second embodiment without impairing the writing performance, and the viewpoint of storage stability, the content of the functional particles in the ink composition is desirably preferably 0.1 to 30.0% by mass, and further desirably 1.0 to 15.0% by mass, in terms of solid content, relative to the total amount of the ink composition.

[0184] As the colorant that can be used, similarly to the above first embodiment, a water-soluble dye, a pigment such as an inorganic pigment, an organic pigment, a plastic pigment, a hollow resin particle having a void inside as a white pigment, or a resin particle colored with a dye having excellent color development and dispersibility (simulated pigment), a thermochromic pigment, a photochromic pigment, and the like can be used, and the content thereof also varies depending on the type of the writing instrument and the like, and is 1 to 30% by mass, relative to the total amount of the ink composition.

[0185] The water-soluble organic solvent that can be used, and the content thereof are the same as in the above first embodiment, and thus the description thereof is omitted.

[0186] In the writing instrument water-based ink composition of the present second embodiment, in addition to the above functional particle dispersion, colorant, water-soluble solvent, and the balance of water (tap water, purified water, distilled water, ion-exchanged water, pure water, and the like) as a solvent, dispersants, lubricants, pH adjustors, rust-preventive agents, thickening agents, evaporation inhibitors, surfactants, and the like can be appropriately contained, similarly to the above first embodiment, within a range that does not impair the effects of the present second embodiment. The description of these components is the same as in the above first embodiment, and thus the description of each component is omitted.

[0187] The writing instrument water-based ink composition of the present second embodiment can be prepared by appropriately combining the above functional particle dispersion, water-soluble solvent, and other components, as appropriate, depending on the purpose of the ink for a writing instrument (for a ballpoint pen, a marker, and the like), stirring and mixing the same using a homogenizer, a homomixer, or a disperser, and the like, and further removing coarse particles in the ink composition, and the like, as necessary, by filtration, centrifugal separation, and the like.

[0188] In addition, the pH (25°C) of the writing instrument water-based ink composition of the present second embodiment is desirably preferably adjusted to 5 to 10, and further desirably set to 6 to 9.5, using a pH adjustor or the like, similarly to the above first embodiment, from the viewpoints of usability, safety, stability of the ink itself, and compatibility with an ink storage body.

[0189] The writing instrument water-based ink composition of the present second embodiment is mounted in a ballpoint pen, a marker, or the like having a pen tip portion of a ballpoint pen tip, a fiber tip, a felt tip, a plastic tip, or the like, in the same manner as the first embodiment described above. The configuration of the ballpoint pen, the marker, or the like is the same as that of the first embodiment described above, and thus the description thereof is omitted.

[0190] In the writing instrument water-based ink composition of the present second embodiment thus configured, since the functional particle dispersion having the antibacterial property and the fragrance property described above is compounded in the writing instrument water-based ink composition, the strength of the antibacterial property and the fragrance property in the ink composition, and the persistence thereof are maintained, and no adverse effects are caused on other compounded components and the like, the respective persistent effects are long-term persistent, and the particles do not impair the storage stability and the writing property, and thus the degree of freedom of ink design can be further improved, and a writing instrument water-based ink composition suitable for a writing instrument such as a ballpoint pen, a marker, or the like can be obtained.

[0191] Further, the zeta potential measurement value of the functional particle having the antibacterial property and the fragrance property described above in the dispersion used in the writing instrument water-based ink composition of the present second embodiment is set to a prescribed range, and thus even in a compounding system of an ionic water-based ink using a polysaccharide fiber such as cellulose nanofiber (a gel based on a hydrogen bond network of CNF, or the like) as a thickening agent for a writing instrument ink, the initial state of the dispersion stability of the functional particle can be maintained, and even in a compounding system of an unstable water-based ink such as an ionic system, the irritation is less, and thus the sufficient line density is not impaired, and a writing instrument water-based ink composition having excellent dispersion stability can be obtained.

[0192] In the above, the case where the functional particle dispersion of the present second embodiment is used in a writing instrument water-based ink composition is described, but the functional particle dispersion of the present second embodiment is excellent in the antibacterial effect of the antibacterial component and the fragrance property even after a long period of time elapses, and is high in safety, and by selecting the antibacterial component used, a wide antibacterial spectrum can be obtained, no adverse effects are caused on other compounded components, the compounded properties, and the like, the stability is excellent, and the use in the above cleaning agent use, the personal care use, the industrial water treatment use, a food additive, an electronic device use, a water tank and a medicated bath use for water mold suppression on aquatic organisms (fishes, and the like) can be implemented at a suitable compounding ratio.

[0193] (Functional particle dispersion of third embodiment)

[0194] The functional particle dispersion of the present third embodiment is characterized in that functional particles composed of at least one reducing component selected from the Z group described below in addition to the (meth)acrylate monomer represented by the above general formula (I) are dispersed in water, and that the Zeta potential measurement value of the functional particles is in the range of -15 to +15 mV.

[0195] Z group: polyphenols, copper chlorophyll, flavonoids, anthocyanins, dibutylhydroxytoluene, butylhydroxyanisole.

[0196] The functional particle dispersion of the present third embodiment differs from the functional particle dispersion of the above first embodiment in that the functional particles are composed of at least one reducing component selected from the Z group described above instead of the antibacterial component in the (meth)acrylate monomer represented by the above general formula (I), and the kind of the (meth)acrylate monomer represented by the above general formula (I) and the like and the content thereof are the same as those described in detail in the functional particle dispersion of the above first embodiment, and thus the description thereof and the like is omitted.

[0197] The reducing component used in the present third embodiment has a reducing property (oxygen absorption ability) to oxygen, and at least one selected from the Z group: polyphenols, copper chlorophyll, flavonoids, anthocyanins, dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA) can be exemplified.

[0198] The polyphenols that can be used include phenolic molecules having a plurality of hydroxyl groups. As the polyphenols, flavonoids, and anthocyanins that can be used, for example, catechins (epicatechin, epigallocatechin, epicatechin gallate, epigallocatechin gallate, and the like), tannic acid, tannin, chlorogenic acid, caffeic acid, neochlorogenic acid, anthocyanin, proanthocyanidin, theaflavins, rutin, flavonoids (quercitrin, cyanidin glycoside, flavanone, flavanol, flavonol, isoflavone, and the like), ferulic acid, gingerol, anthocyanins (pelargodinin, cyanidin, delphinidin, peonidin, malvidin, petunidin), flavones, chalcones (naringenin chalcone and the like), lutein, salviol, nobiletin, citropten, honokiol, magnolol, ellagic acid, lignan, curcumin, coumarin, catechol, proanthocyanidin, theaflavin, rosmarinic acid, xanthone, quercetin, resveratrol, gallic acid, propyl gallate, phlorotannins, coniferyl alcohol [5-(dihydroxyphenylvinyl)resorcinol] (product name "Pasanol PA"), resveratrol (3,5,4'-trihydroxy-trans-stilbene), and the like can be exemplified.

[0199] As a reducing component, catechin, tannin, chlorogenic acid, piceatannol, copper chlorophyll, ferulic acid, curcumin, gingerenol, rutin, anthocyanin, isoflavone, anthocyanidin (pelargonidin, cyanidin, delphinidin, peonidin, malvidin, petunidin), dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA) are preferred, and chlorogenic acid, tannin, catechin, ferulic acid, piceatannol, dibutylhydroxytoluene (BHT), butylhydroxyanisole (BHA) are further preferred.

[0200] In the functional particle dispersion of the present third embodiment, the functional particles composed of at least the (meth)acrylate monomer represented by the above general formula (I) and at least one reducing component selected from the above Z group are dispersed in water, and the Zeta potential measurement value of the functional particles is in the range of -15 to +15 mV, preferably in the range of -10 to +10 mV.

[0201] By setting the Zeta potential measurement value of the above functional particles in the range of -15 to +15 mV, even if a compounding system susceptible to ions, a polysaccharide fiber such as a cellulose nanofiber (gel based on CNF hydrogen bond network, etc.) as a charge-sensitive thickener, an alkali-thickening thickener such as an alkali-swellable emulsion, and the like are used, the dispersion of the functional particles having reducing properties can maintain a stable initial state, has low irritation, and has a high degree of freedom in compounding design, and thus a functional particle dispersion that can be used for various purposes can be obtained.

[0202] If the above Zeta potential measurement value is outside the range of -15 to +15 mV, the effect of the present disclosure cannot be exerted, and if the Zeta potential measurement value is less than -15 mV, the compounding system has a large change over time, and becomes poorly dispersed, and on the other hand, if the Zeta potential measurement value exceeds +15 mV, the compounding system also has a large change over time, and becomes poorly dispersed, and thus is not preferred.

[0203] In order to make the above Zeta potential measurement value in the range of -15 to +15 mV, for example, the above functional particles having reducing properties are obtained by emulsion polymerization or the like, and by using a nonionic polymerizable surfactant (kind, amount, etc.) as a polymerizable surfactant used in emulsion polymerization, a functional particle dispersion having reducing properties having a prescribed Zeta potential can be obtained.

[0204] In the production of the functional particle dispersion of the present third embodiment, for example, at least one reducing component selected from the above-mentioned Z group is dissolved in the above-mentioned (meth) acrylate monomer (each alone or two or more kinds, the same hereinafter) or a mixed monomer containing the above-mentioned (meth) acrylate monomer and a hydrophobic vinyl monomer other than the same, and the like, using ammonium persulfate, potassium persulfate, hydrogen peroxide, or the like as a polymerization initiator, or a polymerization initiator further combined with a reducing agent, using a nonionic polymerizable surfactant (kind / amount) as a polymerizable surfactant, thereby obtaining a dispersion of the functional particle having reducing properties, in which the above-mentioned zeta potential measurement value is in the range of -15 to +15 mV.

[0205] The nonionic polymerizable surfactant that can be used, the amount thereof used, and the like are the same as in the above-mentioned first and second embodiments, and are in an amount in which the zeta potential measurement value becomes in the range of -15 to +15 mV, and vary depending on the at least one antibacterial component selected from the above-mentioned X group, and the like, which is used, and desirably is 0.1 to 50% by mass, and preferably is 5 to 50% by mass, with respect to the total amount of the above-mentioned monomers.

[0206] Further, in the present third embodiment, in a range not impairing the effects of the third embodiment, as in the above first embodiment, emulsion polymerization or the like can be performed by using a cross-linking agent such as triallyl isocyanurate, triallyl isocyanurate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, pentaerythritol acrylate, bis (trimethylolpropane) acrylate, di-pentaerythritol acrylate, tri-pentaerythritol acrylate, methoxylated bisphenol A methacrylate, ethoxylated bisphenol A dimethacrylate, pentaerythritol methacrylate, bis (trimethylolpropane) methacrylate, di-pentaerythritol methacrylate, tri-pentaerythritol methacrylate, ethoxylated polyglyceryl methacrylate, allyl methacrylate, 1,4-butanediol diacrylate, or the like, polyoxyethylene-1- (allyloxymethyl) -alkyl ammonium ether sulfate as needed, ether sulfate, polyoxyethylene nonyl acryl phenyl ether ammonium sulfate, polyoxyethylene nonyl acryl phenyl ether, polyacrylic acid ammonium, styrene-maleic acid copolymer ammonium, polyoxyethylene alkyl ether, polyoxyethylene styrenated phenyl ether, polyoxyethylene polyoxypropylene glycol, polyalkylene oxide decyl ether, polyoxyethylene tridecyl ether, alkyl benzene sulfonate, dioctyl sulfosuccinate, sodium lauryl sulfate, polyoxyethylene alkyl ether phosphate, polyoxyethylene styrenated phenyl ether phosphate, polyoxyethylene styrenated phenyl ether sulfate, polyoxyethylene alkyl ether sulfate, polyoxyethylene sorbitan monolaurate (polysorbate 20), polyoxyethylene sorbitan palmitate (polysorbate 40), polyoxyethylene sorbitan monostearate (polysorbate 60), polyoxyethylene sorbitan oleate (polysorbate 80), or the like, polymeric surfactant (emulsifier), and the like, and after the dispersion liquid in which the functional particle dispersion is successfully manufactured is obtained, the functional particle dispersion can be manufactured by drying or the like.

[0207] The content of the above cross-linking agent such as triallyl isocyanurate or the like is 0 to 50 mass% with respect to the total amount of the above monomers, and is preferably 0.1 to 25 mass%.

[0208] If the above cross-linking agent such as triallyl isocyanurate or the like is used, the heat resistance, mechanical properties, hydrolysis resistance, weather resistance of the functional particle dispersion can be improved, and thus is preferred.

[0209] In the present third embodiment, as in the above first embodiment, during the above emulsion polymerization, an appropriate amount of a (meth) acrylic dicyclopent(en)yl ester monomer or the like can be further mixed in the above (meth) acrylate monomer or the like, and emulsion polymerization can be performed. In a substance obtained by further mixing the (meth) acrylic dicyclopent(en)yl ester monomer and performing emulsion polymerization, even if the moisture in the dispersion liquid evaporates, the stability is not easily impaired, and further, a functional particle dispersion excellent in stability can be obtained.

[0210] The dicyclopent(en)yl (meth)acrylate monomers that can be used include dicyclopentyl acrylate monomers, dicyclopentenyl acrylate, dicyclopentyl methacrylate monomers, dicyclopentenyl methacrylate.

[0211] In addition, in the present third embodiment, at the time of the above-mentioned emulsion polymerization, on the basis of the above-mentioned (meth)acrylate monomers, the above-mentioned hydrophobic vinyl monomers other than the above-mentioned (meth)acrylate monomers, and the above-mentioned (meth)acrylate dicyclopent(en)yl monomers, a suitable amount of a monomer having a reactive crosslinking group such as an epoxy group, a hydroxymethylamide group, an isocyanate group, and a multifunctional monomer having two or more vinyl groups can be compounded to perform crosslinking.

[0212] In the present third embodiment, in the polymer component constituting the above-mentioned functional particle dispersion, it is desirable that the content of the above-mentioned (meth)acrylate monomers be 30% by mass or more, preferably 30 to 95% by mass, and further preferably 30 to 70% by mass, relative to the entire polymer component constituting the functional particle dispersion.

[0213] Note that, in the present third embodiment, the "entire polymer component" refers to the polymerizable component constituting the functional particle dispersion, and specifically refers to the total amount of the used (meth)acrylate monomers, the used other monomer components, and the crosslinking agent described later.

[0214] By making the content of the above-mentioned (meth)acrylate monomers 30% by mass or more relative to the entire polymer component, the effects of the present disclosure can be exerted, and on the other hand, if the content is less than 30% by mass, the stability over time is poor, and this is not preferred.

[0215] In the polymer component constituting the above-mentioned functional particle dispersion, the content of the other monomer components other than the above-mentioned (meth)acrylate monomers is the balance of the total amount of the used (meth)acrylate monomers and the crosslinking agent described later.

[0216] From the aspect of further exerting the effects of the present disclosure, the aspect of dispersibility, and the aspect of reactivity, it is preferred that the content of the other monomer components be 0.5 to 70% by mass relative to the entire polymer component.

[0217] In the present third embodiment, from the aspect of obtaining sufficient reducing performance, the aspect of obtaining a sustained reducing effect, and the like, and the aspect of stability, it is desirable that the content of the above-mentioned reducing component (solid component) be 1% by mass or more, preferably 5% by mass or more, more preferably 10 to 50% by mass, and particularly preferably 15 to 40% by mass, relative to the entire polymer component.

[0218] By setting the content of the reducing component to 1 mass% or more, sufficient reducing performance and sustained reducing effect can be exerted. On the other hand, if the content of the reducing component is less than 1 mass%, the reducing performance is not sufficient, and the effect of the present third embodiment cannot be exerted.

[0219] In the present third embodiment, from the viewpoint of exerting a wide antibacterial spectrum and an antibacterial effect, a functional particle containing an antibacterial component in addition to the above-mentioned reducing component can be produced.

[0220] The antibacterial component that can be used can be a conventionally known component, and is preferably a compound that is highly safe, does not adversely affect the reducing component, and has a long-term antibacterial effect, and for example, at least one selected from the group X described in the first embodiment can be listed.

[0221] In the group X described in the above-mentioned first embodiment, as a further preferred antibacterial component, from the viewpoint of stability over time, the aspect that it is comparatively easy to obtain and the cost is suppressed to be inexpensive, and the aspect of safety, it is desirable that it is an iodopropargyl compound, 1,2-benzisothiazolin-3-one, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, sodium benzoate, sodium dehydroacetate, potassium sorbate, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, 2-mercaptopyridine-1-oxide sodium salt, 1-hydroxypyridinethione sodium salt, 2-(4-thiazolyl)benzimidazole, pinene-4-ol, 1,8-eucalyptol, diisothiocyanate, isopropylmethylphenol, 2-methyl-4-isothiazolin-3-one, citral, eugenol, allylisothiocyanate, D-limonene, tannic acid, nipagin ethyl, benzalkonium chloride, glycerol fatty acid ester, salicylic acid, ethyl paraben, butyl paraben, propyl paraben, methyl paraben, hinokitiol, phenylethanol, 2-phenylethanol, nipagin butyl, nipagin propyl, benzalkonium chloride, nipagin methyl, 2-(4-thiazolyl)benzimidazole.

[0222] In the present third embodiment, with respect to the content of the antibacterial component (solid component), from the viewpoint of obtaining a further sustained antibacterial effect, stability, and the like, it is desirable that it is 1 mass% or more, preferably 5 mass% or more, more preferably 10 to 50 mass%, and particularly preferably 15 to 40 mass% with respect to the total polymer component.

[0223] By making the content of the antibacterial component 1% by mass or more, a more sufficient antibacterial effect (oxygen absorption ability), a sustained reducing effect can be exerted, on the other hand, when the content of the preservative component is less than 1% by mass, the further effect of the present third embodiment containing the antibacterial component cannot be exerted.

[0224] In the present third embodiment, by the above-described preferred means, specifically, at least dissolving the reducing component selected from the above-described Z group in the above-described (meth)acrylate monomer, further dissolving the antibacterial component, performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, etc.), or dissolving the above-described reducing component (further the antibacterial component) after polymerization of a mixed monomer containing at least the above-described (meth)acrylate monomer and other monomer components, performing emulsion polymerization using a nonionic polymerizable surfactant (kind, amount, etc.), a functional particle dispersion (dispersion liquid) in which functional particles having reducing properties, and having reducing and antibacterial effects are dispersed in water having a prescribed Zeta potential (Zeta potential measurement value in the range of -15 to +15 mV) is obtained. The manufacturing amount of the functional particles having reducing properties, etc. in the functional particle dispersion obtained under these manufacturing conditions varies depending on the compounding amount of the above-described (meth)acrylate monomer, reducing component, or antibacterial component, nonionic polymerizable surfactant, etc., polymerization conditions, etc., and from the viewpoints of manufacturability, workability, efficiency, etc., it is preferable to manufacture at 1 to 50% by mass in terms of solid content. It is more preferable to manufacture in a manner so as to become 10 to 40% by mass in terms of solid content.

[0225] The functional particle dispersion (dispersion liquid) having reducing properties, by manufacturing the functional particle dispersion of the present third embodiment, has the strength of the reducing properties and the sustainability thereof compared to the case of using the above-described functional particles alone, and does not cause adverse effects on other compounding components, etc., and becomes a functional particle dispersion excellent in stability. In particular, a functional particle dispersion which can maintain or improve the reducing effect of the reducing component even after a long period of time can be obtained.

[0226] The functional particle dispersion (dispersion liquid) can maintain the initial state of stable dispersion even in compounding systems, aqueous ink compounding systems, etc. which are easily affected by ions, and is low in irritation, has a design freedom which has not been seen so far, and can be suitably used for various uses.

[0227] In addition, in the present third embodiment, as the reducing component, an oil-soluble (oleophilic) reducing component or the like is preferably used, and therefore, particularly for the problem that the reducing component or the like easily adheres to a plastic container, the reducing performance is deteriorated over time, by enclosing the antibacterial component and the perfume component in the particles formed of the (meth)acrylic component or the like of the present third embodiment, the adhesion to the container wall surface is suppressed, and the reducing effect can be maintained even after a long period of time elapses.

[0228] In addition, in the present third embodiment, the average particle diameter of the functional particles in the obtained functional particle dispersion varies depending on the (meth)acrylic ester monomer, the kind and content of the other monomers used, the polymerization conditions at the time of polymerization, and the like, and as in the above-described first embodiment, it is desirable that the average particle diameter be preferably 10 to 800 nm, further preferably 20 to 300 nm, and further preferably 30 to 200 nm.

[0229] By setting the average particle diameter to the above-described preferable range, further, the storage stability and the like become excellent, and the functional particles that become the average particle diameter suitable for each use described later can be used, in the case of being used for a water-based ink for a writing instrument, the ink cartridge of a signing pen, a marker pen, a ballpoint pen, or the like is not clogged, and further, the storage stability and the like become excellent.

[0230] In the functional particle dispersion of the present third embodiment, the content of the functional particles contained in the dispersion is desirably preferably 0.1 to 50% by mass, and further preferably 1 to 30% by mass, in terms of the solid content amount, depending on each use described later or the like.

[0231] When the content of the functional particles is less than 0.1% by mass in terms of the solid content amount, the effect of the present disclosure cannot be exerted, and on the other hand, when it exceeds 50% by mass, the long-term storage stability easily deteriorates.

[0232] The functional particle dispersion of the present third embodiment thus configured has reducing performance or reducing performance and antibacterial effect, and has high stability and safety, can maintain the initial state of stable dispersion, and is low in irritation, and has a design freedom that has not been achieved so far, and can be used to impart reducing performance or reducing performance and antibacterial performance to various products such as an ink composition or the like for various uses such as a medical tool, a baby product, a nursing product, a bath product, a kitchen product, tableware, a drinking water piping member, a sanitary product, a home appliance product, a clothing product, a building material, an agricultural material, an automotive interior member, a stationery, a writing instrument, an inkjet printer, and the like.

[0233] As specific uses, in addition to the above, for example, it can be suitable for cleaning agent uses such as laundry detergents, softeners, household detergents, dishwashing detergents, hard surface cleaning agents, and the like; personal care uses such as shampoos, hair conditioners, cosmetic water, emulsions, creams, sunscreens, foundations, eye makeup products, hair dye products, nail care products, antiperspirants, toothpastes, and the like; industrial water treatment uses such as paints, adhesives, building materials, resin emulsions, wood preservatives, cement admixtures, boilers, cooling equipment, wastewater treatment equipment, industrial water (papermaking process water, cooling water, cleaning water for various industries), and the like; electronic device uses such as medical devices, food additives, solar cell modules, organic element devices, heat radiation shielding films, and the like; and water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, and the like).

[0234] The functional particle dispersion of the present third embodiment is high in stability and safety, has a reducing property, or a reducing property and an antibacterial effect, can maintain an initial state of stable dispersion, and is low in irritation, has a degree of design freedom that has not been seen so far, does not affect other compounding components, and further, even in a compounding system of a dispersion liquid sensitive to charge, a compounding system of an aqueous ink, and the like, changes in dispersion stability over time are small, and becomes a functional particle dispersion that can maintain an initial state, and thus, as described above, can impart a reducing property, or a reducing property and an antibacterial effect to various products, and in particular, can be suitable for cleaning agent uses, personal care uses, industrial water treatment uses, food additives, electronic device uses, water tank and medicinal bath uses for water mold inhibition of aquatic organisms (fish, and the like), and the like, and for example, the following describes a case of an aqueous ink composition for writing instruments.

[0235] The aqueous ink composition for writing instruments of the present third embodiment is characterized by containing at least the functional particle dispersion having a reducing property described above, and on the basis of the functional particle dispersion, can further contain a colorant, a water-soluble organic solvent.

[0236] From the viewpoint of exerting the effects of the present third embodiment without impairing the writing performance, and the viewpoint of storage stability, the content of the functional particles in the ink composition is desirably 0.1 to 30.0% by mass, further desirably 1.0 to 15.0% by mass, in terms of solid content amount, relative to the total amount of the ink composition.

[0237] As the colorant that can be used, as with the above-described first embodiment, a water-soluble dye, a pigment such as an inorganic pigment, an organic pigment, a plastic pigment, a hollow resin particle having a void inside as a white pigment, or a resin particle dyed with a dye having excellent color development and dispersibility (a simulated pigment), a thermochromic pigment, a photochromic pigment, and the like can be used, and the content thereof also varies depending on the type of the writing instrument and the like, and is 1 to 30% by mass with respect to the total amount of the ink composition.

[0238] The water-soluble organic solvent that can be used, and the content thereof are the same as in the above-described first embodiment, and thus the description thereof is omitted.

[0239] In the water-based ink composition for a writing instrument of the present third embodiment, in addition to the above-described particles having the above-described characteristics, the colorant, the water-soluble solvent, and the balance of water (tap water, purified water, distilled water, ion-exchanged water, pure water, and the like) as a solvent, a dispersant, a lubricant, a pH adjuster, a rust preventive, a thickening agent, an evaporation inhibitor, a surfactant, and the like can be appropriately contained, as with the above-described first embodiment, within a range that does not impair the effects of the present second embodiment. The description of these respective components is the same as in the above-described first embodiment, and thus the description thereof is omitted.

[0240] The water-based ink composition for a writing instrument of the present third embodiment can be prepared by appropriately combining the above-described functional particle dispersion, the water-soluble solvent, and the other respective components, depending on the purpose of the ink for a writing instrument (ball-point pen, marker, and the like), stirring and mixing the components using a homogenizer, a homomixer, or a disperser, and further, if necessary, removing coarse particles in the ink composition by filtration, centrifugal separation, and the like.

[0241] In addition, the pH (25°C) of the water-based ink composition for a writing instrument of the present third embodiment is desirably adjusted to 5 to 10, and further desirably set to 6 to 9.5, using a pH adjuster or the like, as with the above-described first embodiment, from the viewpoints of usability, safety, stability of the ink itself, and compatibility with an ink storage body.

[0242] The water-based ink composition for a writing instrument of the present third embodiment is mounted in a ball-point pen, a marker, and the like having a pen tip portion of a ball-point pen tip, a fiber tip, a felt tip, a plastic tip, and the like, as with the above-described first embodiment. The configuration of the ball-point pen, the marker, and the like is the same as in the above-described first embodiment, and thus the description thereof is omitted.

[0243] In the writing instrument water-based ink composition of the third embodiment thus constituted, since the functional particle dispersion having the above-described properties of reducing property is used and compounded in the writing instrument water-based ink composition, the strength and persistence of the reducing property in the ink composition are maintained, and no adverse effects are caused on other compounded components and the like, so the respective persistent effects are long-term persistent, and these particles do not impair the storage stability and the writing property, so the degree of freedom of ink design can be further improved, and a writing instrument water-based ink composition suitable for a writing instrument such as a ballpoint pen, a marker pen, and the like can be obtained.

[0244] Further, the zeta potential measurement value of the functional particle having the above-described properties of reducing property in the dispersion used in the writing instrument water-based ink composition of the third embodiment is set to a prescribed range, so even in a compounding system of an electrocharge-sensitive water-based ink using a polysaccharide fiber such as cellulose nanofiber (a gel based on a hydrogen bond network of CNF and the like) as a thickening agent for a writing instrument ink, the initial state of dispersion stability of the functional particle can be maintained, and even in a compounding system of an unstable water-based ink such as an ionic system, the irritation is less, so the sufficient line concentration is not impaired, and a writing instrument water-based ink composition excellent in dispersion stability can be obtained.

[0245] In the above, the case where the functional particle dispersion of the third embodiment is used in a writing instrument water-based ink composition is described, but the functional particle dispersion of the third embodiment is excellent in reducing property or reducing property and antibacterial effect even after a long period of time elapses, and is high in safety, and by selecting the antibacterial ingredient used, a wide antibacterial spectrum can be obtained, no adverse effects are caused on other compounded components, the compounded properties, and the like, the stability is excellent, and can be used in the above-described cleaning agent use, personal care use, industrial water treatment use, food additive, electronic device use, water tank and medicated bath use as a water mold suppression for aquatic organisms (fish and the like).

[0246] (Cosmetics: cosmetics containing the functional particle dispersion)

[0247] The cosmetics of the present application are characterized by containing the functional particle dispersion of each of the first to third embodiments described above, and specifically, 1) characterized by containing at least the functional particle dispersion having antibacterial property thus constituted; 2) characterized by containing at least the functional particle dispersion having antibacterial property and fragrance function thus constituted; and 3) characterized by containing the functional particle dispersion excellent in reducing property or reducing property and antibacterial effect thus constituted.

[0248] As cosmetics, examples include skincare cosmetics such as toners, lotions, serums, creams, body lotions, body powders, and body gels; makeup cosmetics such as foundations, sunscreens, makeup bases, eyeshadows, eyeliners, blushes, lipsticks, mascaras, and powders; hair care cosmetics such as hair mists, hair oils, hairsprays, nail polishes, shampoos, conditioners, smoothing agents, treatment agents, sprays, and mousses; and deodorant cosmetics. For each application of these cosmetics (skincare cosmetics, makeup cosmetics, hair care cosmetics, deodorant cosmetics, etc.), base ingredients, colorants, water-soluble resins, lower alcohols, moisturizers (softeners, emollients), astringents (antiperspirants), cooling agents, whitening agents, and UV absorbers can be used. Furthermore, the ingredients of cosmetics are not limited to these examples; any ingredient that is obvious to those skilled in the art can be used.

[0249] From the perspectives of maximizing the effects of each implementation method, preserving stability, and various uses of the cosmetics, it is ideal that the content of functional particles in these cosmetics is preferably 0.1 to 30.0% by mass relative to the total amount of the cosmetics as solid ingredients, and more preferably 1.0 to 20.0% by mass.

[0250] The cosmetic of the present invention is applied to cosmetic application tools of various structures and shapes commonly used in the above-mentioned skin care cosmetics, color cosmetics, hair cosmetics, deodorant cosmetics, etc., and is used in any form, such as liquid, solid, semi-solid, or gel.

[0251] For example, it is preferable to use a coating tool that has a pen tip (ink pen) as a coating unit, a pen refill, and a coating body made of rubber, elastomer or resilient independent air bubbles as a coating unit, and has a container for filling liquid cosmetics, etc.; specifically, it is a cosmetic coating tool with excellent usability, ease of use and coating performance, with mechanisms of rotary dispensing type, cosmetic built-in type coating tool type and collector type.

[0252] As a rotary dispensing type of cosmetic applicator, such as Figure 1 As shown, it has a coating section 30, which is provided in front of the cosmetic built-in container and is formed by a pen tip (ink pen). The cosmetic built-in container is a storage section 11 that sprays out cosmetic (liquid type) built in front of the liquid pressing mechanism 10 by means of the liquid pressing mechanism 10.

[0253] The liquid pressing mechanism 10 is configured to deliver liquid cosmetics from the container (storage section) 11 to the coating section 30 by rotating the delivery member 13 disposed at the rear end of the shaft body 12 relative to the shaft body 12 in a circumferential direction.

[0254] The liquid pressing mechanism 10 of the application tool has a delivery member 13 rotatably fitted into the rear end of the shaft body 12, a drive cylinder 15 that transmits the rotational force of the delivery member 13 to a threaded rod 14 based on the user, a threaded body 16 fixed to the shaft body 12 and screwed with the threaded rod 14, the threaded rod 14 rotatably engaging the piston body 17 at the front end, and the piston body 17 sliding within the storage portion 11 of the shaft body 12. The structure is such that the rotation of the delivery member 13 is transmitted to the threaded rod 14 via the drive cylinder 15, and by the rotation of the threaded rod 14, the threaded rod 14 and the piston body 17 advance via the internal thread of the nut-like threaded body 16, and the liquid cosmetic is delivered from within the storage portion 11 to the application portion 30.

[0255] As shown in Figure 1 , the operation portion of the delivery member 13, which is closed in a cylindrical shape by the crown portion 13a inserted into the rear end, is rotatably fitted into the rear end portion of the shaft body 12 and exposed. The drive cylinder 15 is fitted into the delivery member 13 and fixed in the rotational direction, and the threaded body 16 is installed within the drive cylinder 15, fixed in the rotational direction and capable of moving in the axial direction. 13b is a spring member for applying a force to the rear side to the delivery member 13 as a rotating body.

[0256] In the application tool, the sealing portion 18, the joint member 19, the front shaft 20, and the application portion 30 are installed at the front end portion 12a of the shaft body 12 by fitting. The liquid cosmetic is accommodated in the storage portion 11 of the shaft body 12, and the liquid cosmetic delivered from the storage portion 11 is discharged to the application portion 30 through the flow path within the joint member 19 and can be applied. In addition, the cover 40 is formed in such a manner as to be installable to the front shaft 20 to cover the application portion 30 and the front shaft 20 after use.

[0257] In addition, in Figure 1 , reference numeral 21 is a stirring ball that stirs the liquid cosmetic within the storage portion 11 by reciprocating motion, and reference numeral 22 is a sealing ball. In addition, 41 is an inner cover within the cover 40, and 42 is a spring for applying a force to the rear of the inner cover. Note that the stirring ball 21 can also be omitted.

[0258] Furthermore, reference numeral 23 is a stopper having a ring-shaped portion installed between the rear end of the front shaft 20 and the front surface of the stepped portion of the front end portion 12a of the shaft body 12 in order to position the sealing portion 18, the joint member 19, the front shaft 20, and the application portion 30 at a position that closes the flow path of the liquid cosmetic toward the application portion 30 when not in use. A part of the ring-shaped portion of the stopper 23 is cut off, and a pinch tab is integrally formed on the opposite side of the cut-off portion, and by pulling the pinch tab, the ring-shaped portion expands in diameter from the cut-off portion and is detached from between the rear end of the front shaft 20 and the front end portion 12a of the shaft body 12.

[0259] AsFigure 1 As shown, in non-use, the sealing ball 22 is embedded in the inner diameter portion of the sealing portion 18 that becomes a sealing ball receiving portion, and liquid cosmetic does not flow to the application portion 30 side. On the other hand, in use, the user pulls out the stopper 23 from the shaft body 12, and presses the front shaft 20 to the rear end side, so that the rear end thin diameter portion of the joint member 19 abuts against the sealing ball 22, and the sealing ball 22 is separated from the inner diameter portion of the sealing portion 18 and enters the storage portion 11, and the liquid cosmetic in the storage portion 11 flows from the inner diameter portion of the joint member 19 into the liquid flow path of the application portion 30, and is supplied from the inside to the application portion 30, and can be applied to the target portion.

[0260] Figure 1 The cosmetic application tool of the rotating delivery type is an example, and is not limited thereto, and various structures and shapes of cosmetic application tools other than this can be used.

[0261] In the cosmetic of the present application, in the case of using the functional particle dispersion of each of the above embodiments, for example, if the functional particle of the first embodiment of the specific properties constituted of at least the (meth) acrylate monomer represented by the above general formula (I) and at least one antibacterial component selected from the above Group X is used in a cosmetic, the persistence of the antibacterial effect can be obtained without impairing the dispersion stability, the fixing property, the water resistance, and the sebum resistance, and by changing the kind of the antibacterial component added to the cosmetic, the optimal component can be adjusted according to the use for the skin, the hair, and the like, and the product value can be improved.

[0262] Further, in the case of the functional particle of the second embodiment of the specific properties constituted of at least the (meth) acrylate monomer represented by the above general formula (I), and at least one antibacterial component, a perfume component selected from the above Group X, the antibacterial effect by the antibacterial component is obtained, and by changing the kind of the perfume that imparts a scent to the cosmetic itself, and the kind of the perfume compounded into the cosmetic, the product value can be improved, and the persistence of the antibacterial effect and the scent can be obtained without impairing the dispersion stability, the fixing property, the water resistance, and the sebum resistance. If the scent imparted to the cosmetic itself and the perfume enclosed in the functional particle are the same fragrance, after the cosmetic is applied, the scent is felt to be reproduced and intensified by contact with the application portion. If the scent imparted to the cosmetic itself and the perfume enclosed in the functional particle are different fragrances, after the cosmetic is applied, different scents are felt by contact with the application portion. Further, if the functional particle is compounded in the cosmetic without imparting a scent to the cosmetic itself, no scent is felt after the cosmetic is applied, but the scent is felt by contact with the application portion.

[0263] Further, when the functional particles of the third embodiment having the specific properties of at least the (meth)acrylate monomer represented by the above general formula (I) and at least one reducing component selected from the above Z group are used in a cosmetic, the oxidative deterioration of the ink component can be inhibited, and the persistence of the bubble inhibition can be obtained without impairing the dispersion stability, the fixing property, the water resistance, and the sebum resistance.

[0264] Examples

[0265] Next, the present disclosure (the first to third embodiments) will be described in more detail by manufacturing examples, examples, and comparative examples, but the present disclosure is not limited to the following examples and the like.

[0266] [Embodiment 1: Manufacturing Examples 1 to 9: Functional particle dispersion having antibacterial property (particles 1 to 9)]

[0267] Each of the functional particle dispersions having an antibacterial property was manufactured by the following manufacturing examples 1 to 9. Note that "parts" below indicates mass parts. The antibacterial component is the solid component amount.

[0268] (Manufacturing Example 1)

[0269] A stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a 1000-ml separatory funnel for monomer feeding were installed in a 2-L flask, which was set in a hot water bath, and distilled water 344.5 parts, glycerol monomethacrylate [BLEMMER GLM, manufactured by Nippon Oil & Fats Corporation] 5 parts, 2-ethylsulfonate sodium methacrylate [acrylate SEM-Na, manufactured by Mitsubishi Chemical Corporation] 5 parts, a nonionic polymerizable surfactant [LATEMUL PD-430, manufactured by Kao Corporation] 40 parts, and ammonium persulfate 0.5 part were fed while introducing nitrogen, and the internal temperature was raised to 50°C.

[0270] On the other hand, an antibacterial component [iodine propargyl compound: 3-iodo-2-propynyl carbamate, manufactured by Lonza (omacide IPBC 100)] 20 parts and tannin [manufactured by Fuji Chemical Industry Co., Ltd. (tannic acid S)] 14 parts, a crosslinking agent [triallyl isocyanurate, manufactured by Japan Epoxy Resin Co., Ltd., TAIC] 10 parts were mixed in a mixed monomer composed of cyclohexyl methacrylate monomer 55 parts and n-butyl methacrylate 20 parts to prepare a liquid.

[0271] The preparation liquid was added to the above flask kept at a temperature of about 50°C over 3 hours with stirring to perform emulsion polymerization. Further maturation was performed for 5 hours, the polymerization was completed, and a functional particle dispersion having an antibacterial property (dispersion) (particle 1) was obtained.

[0272] The content of the above methacrylate monomer was 54.8 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above antibacterial component was 12.9 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 70 nm. The Zeta potential of the functional particles was -5.8 mV.

[0273] (Production Example 2)

[0274] In the above Production Example 1, the amount of distilled water was set to 334.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as the antibacterial component, an antibacterial component [iodine propargyl compound: 3-iodo-2-propynyl carbamate, manufactured by Lonza (omacide IPBC 100)] was used in an amount of 30 parts, and, other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 2).

[0275] The content of the above methacrylate monomer was 51.5 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above antibacterial component was 18.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 72 nm. The Zeta potential of the functional particles was -8.8 mV.

[0276] (Production Example 3)

[0277] In the above Production Example 1, the amount of distilled water was set to 314.5 parts, the amount of cyclohexyl methacrylate monomer was set to 60 parts, the amount of n-butyl methacrylate was set to 35 parts, and, as the antibacterial component, an antibacterial component [phenoxyethanol, manufactured by Yashichi Synthetic Co.] was used in an amount of 30 parts, and, other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 3).

[0278] The content of the above methacrylate monomer was 56.8 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above antibacterial component was 16.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 108 nm. The Zeta potential of the functional particles was +10.1 mV.

[0279] (Production Example 4)

[0280] In the above Production Example 1, distilled water was set to 324.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as an antibacterial component, an antibacterial component [paraben, manufactured by Ono Pharmaceutical Co., Ltd.] was used in an amount of 40 parts, and, other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 4).

[0281] The content of the above methacrylate monomer was 48.6 mass% with respect to the entire polymer component constituting the functional particle, and the content of the above antibacterial component was 22.9 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 124 nm. The Zeta potential of this functional particle was +3.8 mV.

[0282] (Production Example 5)

[0283] In the above Production Example 1, distilled water was set to 349.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as an antibacterial component, an antibacterial component [chloromethylisothiazolinone / methylisothiazolinone (CMIT / MIT), manufactured by OSAKA CHEMICAL CO., LTD.] was used in an amount of 15 parts, and, other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 5).

[0284] The content of the above methacrylate monomer was 56.7 mass% with respect to the entire polymer component constituting the functional particle, and the content of the above antibacterial component was 10.0 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 95 nm. The Zeta potential of this functional particle was -7.6 mV.

[0285] (Production Example 6)

[0286] In the above Production Example 1, distilled water was set to 334.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as an antibacterial component, an antibacterial component [benzisothiazolinone (BIT), manufactured by OSAKA CHEMICAL CO., LTD.] was used in an amount of 30 parts, and, other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 6).

[0287] The content of the above methacrylate monomer was 51.5 mass% with respect to the entire polymer component constituting the functional particle, and the content of the above antibacterial component was 18.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 60 nm. The Zeta potential of this functional particle was -2.1 mV.

[0288] (Production Example 7)

[0289] In the above Production Example 1, the amount of distilled water was set to 339.0 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as the antibacterial component, an antibacterial component [methyl isothiazolin (MIT), manufactured by DKS Co., Ltd.] was used in an amount of 25 parts. Other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 7).

[0290] The content of the above-described methacrylate monomer was 53.3 mass% with respect to the entire polymer component that constituted the functional particles, and the content of the above-described antibacterial component was 15.6 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 49 nm. The Zeta potential of the functional particles was -9.9 mV.

[0291] (Production Example 8)

[0292] In the above Production Example 1, the amount of distilled water was set to 339.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as the antibacterial component, an antibacterial component [thiabendazole, MOLDBAN-TZ, manufactured by Mitsui & Co., Ltd.] was used in an amount of 25 parts. Other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 8).

[0293] The content of the above-described methacrylate monomer was 53.1 mass% with respect to the entire polymer component that constituted the functional particles, and the content of the above-described antibacterial component was 15.6 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 65 nm. The Zeta potential of the functional particles was -3.8 mV.

[0294] (Production Example 9)

[0295] In the above Production Example 1, the amount of distilled water was set to 334.5 parts, the amount of cyclohexyl methacrylate monomer was set to 45 parts, the amount of n-butyl methacrylate was set to 30 parts, and, as the antibacterial component, an antibacterial component [2-bromo-2-nitropropane-1,3-diol, MOLDBAN-BNP, manufactured by Mitsui & Co., Ltd.] was used in an amount of 30 parts. Other than this, the same operation as in the above Production Example 1 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties (particle 9).

[0296] The content of the above methacrylate monomer was 51.5 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above antibacterial component was 18.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 62 nm. The Zeta potential of the functional particles was +5.1 mV.

[0297] (Comparative Production Example 1)

[0298] The particles A of Example 1 described in Japanese Patent Application Publication No. 2023-1833 were used. The content of the above methacrylate monomer was 50 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above antibacterial component was 36.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 56 nm. The Zeta potential of the functional particles was -30.3 mV.

[0299] The antibacterial effect (bacterial groups, yeasts, filamentous fungi) was evaluated for each of the functional particle dispersions obtained in the above Production Examples 1 to 9 and Comparative Production Example 1 by the following evaluation method.

[0300] Each of the functional particle dispersions (dispersions) obtained in the above Production Examples 1 to 9 was used. The solid component amount of the functional particles in each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 and Comparative Production Example 1 was 35 to 40 mass%.

[0301] The dispersion stability, the antibacterial effect (bacterial groups, yeasts, filamentous fungi) after 3 months at 40°C, and the presence or absence of aggregates were evaluated for each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 and Comparative Production Example 1 by the following evaluation method.

[0302] These results are shown in Table 1 below.

[0303] (Evaluation method of dispersion stability)

[0304] Each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 and Comparative Production Example 1 was filled into a 15-ml glass bottle with a cap together with a stirring ball (φ

[0305] 6.4 mm, stainless steel) to 10 ml, and after sealing, the cap was made to face upward. After being stored at 40°C for 1 month, each dispersion was vibrated. The dispersion stability was evaluated in accordance with the following evaluation criteria by the number of times of vibration until the stirring ball started to move in the glass bottle with a cap.

[0306] Evaluation criteria:

[0307] A: 0 to 3 times.

[0308] B: 4 to 10 times.

[0309] C: 11 times or more.

[0310] ※ 0 times: movement of the stirring ball can be confirmed when the glass bottle with the cap is tilted.

[0311] [Test method for antibacterial effect]

[0312] Each of the dispersions of the functional particle dispersion (dispersion liquid) having antibacterial properties of Production Examples 1 to 9 and Comparative Production Example 1 obtained above was subjected to the following microbial test method according to ISO 11930:2012 (procedure for the interpretation of data generated by preservation efficacy testing or microbiological risk assessment, or both).

[0313] Challenge tests were performed on each of the dispersions at the initial stage and after 3 months at 40°C among the following three groups of bacteria, yeast, and filamentous fungi.

[0314] Bacteria: Stapylococcus aureus NBRC13276, Escherichia coli NBRC3972

[0315] Yeast: Candida albicans NBRC1594

[0316] Filamentous fungi: Aspergillus brasiliensis

[0317] Preparation of inoculum: The inoculum was prepared according to ISO 11930:2012.

[0318] Bacteria: The inoculum was prepared according to ISO 11930:2012, separately for each of the bacterial species. Each of the bacterial species was adjusted to 1 x 10 7 8 cfu / ml, and the three were mixed in equal amounts to prepare the inoculum.

[0319] Yeast: The inoculum was prepared according to ISO 11930:2012 so as to be 1 x 10 6 7 cfu / ml.

[0320] Filamentous fungi: The inoculum was prepared according to ISO 11930:2012 so as to be 1 x 10 6 7 cfu / ml.

[0321] <Inoculation>

[0322] ​​​The bacterial liquid was inoculated in an amount of 1 mass% with respect to the functional particle dispersion having antibacterial properties.

[0323] <Storage>

[0324] The inoculated antibacterial particle dispersion was stored at a temperature of 22.5±2.5°C, and detection cultivation was performed every specified period.

[0325] <Detection Cultivation>

[0326] Each of 10 pieces of the bacterial group was spread on SCD agar medium, each of 10 pieces of the yeast was spread on SD agar medium, and each of 10 pieces of the filamentous fungus was spread on PD agar medium, and the bacterial group and the yeast were cultured at 32.5°C for 2 days, and the filamentous fungus was cultured at 22.5°C for 5 days.

[0327] <Antibacterial Effect in the Initial Stage>

[0328] The antibacterial effect test was performed on each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 and Comparative Production Example 1, and evaluation was performed in accordance with the following evaluation criteria.

[0329] <Evaluation Criteria>

[0330] A+: No colonies appeared at the time of the third day.

[0331] A: No colonies appeared at the time of the seventh day.

[0332] B: No colonies appeared at the time of the twenty-first day.

[0333] C: Several to several tens of colonies appeared at the time of the twenty-eighth day.

[0334] D: A significant increase occurred at the time of the twenty-eighth day.

[0335] <Antibacterial Effect after a Period of 3 Months at a Temperature of 40°C>

[0336] The antibacterial effect test was performed on each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 and Comparative Production Example 1, and evaluation was performed in accordance with the following evaluation criteria.

[0337] <Evaluation Criteria>

[0338] A+: No colonies appeared at the time of the third day.

[0339] A: No colonies appeared at the time of the seventh day.

[0340] B: No colonies appeared at the time of the twenty-first day.

[0341] C: several to several tens of colonies appear at the time of the twenty-eighth day.

[0342] D: a marked increase at the time of the twenty-eighth day.

[0343] (Absence or presence of aggregates)

[0344] Using each of the functional particle dispersions (dispersions) having antibacterial properties obtained in Production Examples 1 to 9 described above, Comparative Production Example 1, 10 ml of each of the functional particle dispersions thus obtained was filled into a glass bottle with a cap, and after sealing, the cap was made to face upward, and after storage for 3 months under conditions of 26°C, the absence or presence of aggregates of each of the functional particle dispersions was evaluated in terms of the sense of sight.

[0345] [Table 1]

[0346]

[0347] As can be seen from Table 1 above, Production Examples 1 to 9 within the scope of the present disclosure had excellent antibacterial effects on each of the bacterial groups, yeasts, filamentous fungi, and bacteria (Escherichia coli, Staphylococcus aureus) that are sources of contamination and the like even after a long period of time (after 3 months at 40°C), had high safety, had no aggregates after a period of time, and had excellent dispersion stability.

[0348] On the other hand, in Comparative Production Example 1, it was not possible to highly balance the dispersion stability and the antibacterial effects, and it was not possible to achieve the effects of the present disclosure.

[0349] [Production of water-based ink compositions for writing instruments (Examples 1 to 9 and Comparative Examples 1 to 4)]

[0350] As Examples 1 to 9, each of the functional particle dispersions having antibacterial properties obtained in Production Examples 1 to 9 described above was used, as Comparative Example 1, Comparative Production Example 1 was used, and as Comparative Examples 2 to 4, each of the dispersions containing antibacterial ingredients (as Comparative Examples 2 to 4, the antibacterial ingredients were IPBC, phenoxyethanol, and nipagin) in which the content of the antibacterial ingredients before being made into particles was 15 mass% were used, and each of the water-based ink compositions for writing instruments was produced by a conventional method using the compounding composition (total amount 100 mass%) shown below.

[0351] Ink composition: (total amount 100 mass%)

[0352] Colorant: colored resin fine particles (1) 50 mass%

[0353] Thickener: polysaccharide fiber (2) 0.3 mass%

[0354] Lubricant: phosphate ester (3) 0.5 mass%

[0355] Functional particle dispersion (manufacturing examples 1 to 9, comparative manufacturing example 1, comparative examples 2 to 4) 20 mass%

[0356] pH adjuster (triethanolamine) 1 mass%

[0357] Water-soluble organic solvent (ethylene glycol) 5 mass%

[0358] Water (distilled water) balance

[0359] *1: LUMICOL NKW-2100E, manufactured by DC CO., LTD.

[0360] *2: RHEOCRYSTA I-2SX, manufactured by the First Industrial Co., Ltd.

[0361] *3: Phosphanol RS-610, manufactured by DOW CORNING TORAY CO., LTD.

[0362] For each of the obtained water-based ink compositions for writing instruments (total amount 100 mass%), the writing property (difference in line density between upper and lower lines), stability, and antibacterial effect during the initial period and 40°C for 3 months were evaluated by a writing instrument constituted by the following, and the following evaluation method.

[0363] Each evaluation result of Examples 1 to 9 and Comparative Examples 1 to 4 is shown in Table 2 below.

[0364] (Manufacture of writing instrument: ballpoint pen)

[0365] Each of the above water-based ink compositions was filled into a pen core formed of a polypropylene ink storage tube having an inner diameter of 4.0 mm and a length of 113 mm, a stainless steel pen point (superhard alloy ball, ball diameter 0.5 mm), and a joint connecting the storage tube and the pen point, using a shaft of a ballpoint pen [manufactured by Mitsubishi Pencil Co., Ltd., trade name: SIGNO UM-100], and a pen refill was manufactured by filling an ink follower mainly composed of mineral oil at the ink rear end.

[0366] [Evaluation method of writing property (difference in line density between upper and lower lines)]

[0367] Each of the above water-based ballpoint pens was left for 1 month at room temperature (25°C, hereinafter the same) in a state with the pen point downward, and writing was performed until the pen was retracted, and the difference in line density between the lines at the start of writing and the end of drawing was compared, and evaluation was performed according to the following evaluation criteria.

[0368] Evaluation criteria:

[0369] A: No difference in density.

[0370] B: Slight difference in density was confirmed.

[0371] C: Significant difference in density was confirmed.

[0372] D: The concentration difference was significant, and the portion where the line was difficult to recognize was confirmed.

[0373] <Method for evaluating stability>

[0374] In each of the above-described ball pens, after being stored for 3 months at 50°C in a state with the tip facing downward, the state of the ink in each of the ink cartridges was visually confirmed, and the evaluation was performed in accordance with the following criteria.

[0375] Evaluation criteria:

[0376] A: No separation or aggregation occurred.

[0377] B: Slight separation or aggregation occurred.

[0378] C: Separation or aggregation occurred.

[0379] D: Significant separation or aggregation occurred.

[0380] [Method for testing antibacterial effect]

[0381] For the writing instrument aqueous ink compositions of Examples 1 to 9 and Comparative Examples 1 to 4, which are within the scope of the present disclosure, the antibacterial effect was also tested for the initial and after 3 months at 40°C according to the method for testing antibacterial effect using the above-described antibacterial particle dispersion (1 mass% of the amount of the bacterial solution was inoculated with respect to the writing instrument aqueous ink composition). For the antibacterial effect after 3 months at 40°C, in order to more strictly confirm the effect of the antibacterial, for each of the writing instrument aqueous ink compositions, the ink was put into a POSCA PC-5M (manufactured by Mitsubishi Pencil Co., Ltd., shaft material: PP resin, stirring ball: stainless steel (φ: 6.4 mm)), and after being stored for 3 months at a temperature of 40°C, the above-described evaluation method (challenge test of three groups of bacteria, yeasts, and filamentous fungi, evaluation criteria) was performed with respect to the ink drawn from the pen body.

[0382] [Table 2]

[0383]

[0384] If Table 2 above is examined, it can be confirmed that the writing instrument aqueous ink compositions of Examples 1 to 9, which are within the scope of the present disclosure, are excellent in writing property (difference in line concentration between upper and lower lines), stability, and in addition, have strength and persistence of antibacterial performance, and do not cause adverse effects on other ink compounding components, as compared with Comparative Examples 1 to 4, which are outside the scope of the present disclosure.

[0385] In addition, it was confirmed that the above-described ball pens had no feathering, no bleeding, had sufficient line concentration, and became clear lines.

[0386] [Embodiment 2: Production Examples 10 to 22: Production of functional aromatic particle dispersion (particles 10 to 22)]

[0387] Functional aromatic particle dispersions having each of antibacterial properties and aromatic properties were produced by the following Production Examples 10 to 22. Note that "parts" below indicates mass parts. The antibacterial component and the aromatic component are solid component amounts.

[0388] (Production Example 10)

[0389] A stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, a 1000 ml separatory funnel for monomer charging, and distilled water 349.5 parts, glycerol monomethacrylate [BLEMMER GLM, manufactured by Nippon Oil & Fats Corporation] 5 parts, 2-ethylsulfonate sodium methacrylate [acrylate SEM-Na, manufactured by Mitsubishi Chemical Corporation] 5 parts, a nonionic polymerizable surfactant [LATEMUL PD-430, manufactured by Kao Corporation] 40 parts, and ammonium persulfate 0.5 part were charged in a 2 liter flask installed in a warm water bath, and while introducing nitrogen, the internal temperature was raised to 50°C.

[0390] On the other hand, a liquid was prepared by mixing an aromatic component [d-limonene, manufactured by Japan Terepene Chemicals Corporation] 17 parts, an antibacterial component [phenoxyethanol, manufactured by Yashichi Synthetic Corporation] 3 parts, and a crosslinking agent [triallyl isocyanurate, manufactured by Japan Chemicals Corporation, TAIC] 10 parts in a mixed monomer composed of cyclohexyl methacrylate monomer 50 parts and n-butyl methacrylate 20 parts.

[0391] This preparation liquid was added to the above flask kept at a temperature of about 50°C over 3 hours with stirring, and emulsion polymerization was performed. Further maturation was performed for 5 hours, and the polymerization was completed, obtaining a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 10).

[0392] The content of the above methacrylate monomer was 54.4 mass% with respect to the entire polymer component constituting the functional particle, the content of the above antibacterial component was 2.0 mass% with respect to the entire polymer component, and the content of the above aromatic component was 11.3 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 99 nm. The Zeta potential of the functional particle was -1.0 mV.

[0393] (Production Example 11)

[0394] In the above Production Example 10, distilled water was set to 347.5 parts, the amount of cyclohexyl methacrylate monomer was set to 53 parts, the amount of n-butyl methacrylate was set to 17 parts, and, in addition, 2-phenylethanol (2-phenylethanol) [manufactured by Inoue Perfumery Manufacturing Co., Ltd.] was used as an aromatic component in an amount of 20 parts, and benzisothiazolinone (BIT) [manufactured by DKS Co., Ltd.] was used as an antibacterial component in an amount of 2 parts, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 11).

[0395] The content of the above methacrylate monomer was 52.6 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 1.3 mass% with respect to the entire polymer component, and the content of the above aromatic component was 13.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 88 nm. The Zeta potential of the functional particles was -0.8 mV.

[0396] (Production Example 12)

[0397] In the above Production Example 10, distilled water was set to 347.5 parts, the amount of cyclohexyl methacrylate monomer was set to 53 parts, the amount of n-butyl methacrylate was set to 17 parts, and, in addition, 2-phenylethanol (2-phenylethanol) [manufactured by Inoue Perfumery Manufacturing Co., Ltd.] was used as an aromatic component in an amount of 20 parts, and benzisothiazolinone (BIT) [manufactured by DKS Co., Ltd.] was used as an antibacterial component in an amount of 2 parts, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 11).

[0398] The content of the above methacrylate monomer was 52.6 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 1.3 mass% with respect to the entire polymer component, and the content of the above aromatic component was 13.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 88 nm. The Zeta potential of the functional particles was -0.8 mV.

[0399] (Production Example 13)

[0400] In the above Production Example 10, distilled water was set to 347.5 parts, the amount of cyclohexyl methacrylate monomer was set to 53 parts, the amount of n-butyl methacrylate was set to 17 parts, and, in addition, 2-phenylethanol (2-phenylethanol) [manufactured by Inoue Perfumery Manufacturing Co., Ltd.] was used as an aromatic component in an amount of 20 parts, and benzisothiazolinone (BIT) [manufactured by DKS Co., Ltd.] was used as an antibacterial component in an amount of 2 parts, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 11).

[0401] The content of the above-mentioned methacrylate monomer was 46.5 mass% with respect to the entire polymer component constituting the functional particles, the content of the above-mentioned antibacterial component was 7.0 mass% with respect to the entire polymer component, and the content of the above-mentioned aromatic component was 17.4 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 118 nm. The Zeta potential of the functional particles was -5.8 mV.

[0402] (Production Example 14)

[0403] In the above-mentioned Production Example 10, the amount of distilled water was set to 329.5 parts, the amount of cyclohexyl methacrylate monomer was set to 45 parts, and the amount of n-butyl methacrylate was set to 25 parts. In addition, 26 parts of eugenol [manufactured by Japan Terebenes Chemical Co.] was used as the aromatic component, and 14 parts of nipagin [manufactured by Ono Pharmaceutical Co.] was used as the antibacterial component, and the same operations as in the above-mentioned Production Example 10 were performed except for these, to obtain a functional particle dispersion (dispersion liquid) having antibacterial and aromatic properties (particle 14).

[0404] The content of the above-mentioned methacrylate monomer was 47.1 mass% with respect to the entire polymer component constituting the functional particles, the content of the above-mentioned antibacterial component was 8.2 mass% with respect to the entire polymer component, and the content of the above-mentioned aromatic component was 15.3 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 127 nm. The Zeta potential of the functional particles was +3.8 mV.

[0405] (Production Example 15)

[0406] In the above-mentioned Production Example 10, the amount of distilled water was set to 314.5 parts, the amount of cyclohexyl methacrylate monomer was set to 50 parts, and the amount of n-butyl methacrylate was set to 30 parts. In addition, 35 parts of γ-decalactone [manufactured by Inoue Kosei Co.] was used as the aromatic component, and 10 parts of iodoacetylenic compound 3-iodo-2-propynyl carbamate [manufactured by Lonza Co. (omacide IPBC 100)] was used as the antibacterial component, and the same operations as in the above-mentioned Production Example 10 were performed except for these, to obtain a functional particle dispersion (dispersion liquid) having antibacterial and aromatic properties (particle 15).

[0407] The content of the above-mentioned methacrylate monomer was 48.6 mass% with respect to the entire polymer component constituting the functional particles, the content of the above-mentioned antibacterial component was 5.4 mass% with respect to the entire polymer component, and the content of the above-mentioned aromatic component was 18.9 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 109 nm. The Zeta potential of the functional particles was -8.5 mV.

[0408] (Production Example 16)

[0409] In the above Production Example 10, the amount of distilled water was set to 324.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, in addition, 1,8-cineole [manufactured by Japan Terebenes Chemical Co., Ltd.] was used as the aromatic component in an amount of 25 parts, and benzisothiazolinone (BIT) [manufactured by Yamada Chemical Industry Co., Ltd.] was used as the preservative component in an amount of 15 parts, and, other than that, the same operations as in the above Production Example 10 were performed to obtain a functional particle dispersion (dispersion liquid) (particle 16) having antibacterial properties and aromatic properties.

[0410] The content of the above methacrylate monomer was 48.6 mass% with respect to the entire polymer component that constituted the functional particles, the content of the above antibacterial component was 8.6 mass% with respect to the entire polymer component, and the content of the above aromatic component was 14.3 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 80 nm. The Zeta potential of the functional particles was -10.5 mV.

[0411] (Production Example 17)

[0412] In the above Production Example 10, the amount of distilled water was set to 334.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, in addition, γ-terpinene was used as the aromatic component in an amount of 25 parts, and methylisothiazolinone (MIT) [manufactured by Yamada Chemical Industry Co., Ltd.] was used as the antibacterial component in an amount of 5 parts, and, other than that, the same operations as in the above Production Example 1 were performed to obtain a functional dispersion (dispersion liquid) (particle 17) having antibacterial properties and aromatic properties.

[0413] The content of the above methacrylate monomer was 51.5 mass% with respect to the entire polymer component that constituted the functional particles, the content of the above antibacterial component was 3.0 mass% with respect to the entire polymer component, and the content of the above aromatic component was 15.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 67 nm. The Zeta potential of the functional particles was +9.0 mV.

[0414] (Production Example 18)

[0415] In the above Production Example 10, the amount of distilled water was set to 334.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, in addition, p-cymene was used as the aromatic component in an amount of 25 parts, and methylisothiazolinone (MIT) [manufactured by Yamada Chemical Industry Co., Ltd.] was used as the antibacterial component in an amount of 5 parts, and, other than that, the same operations as in the above Production Example 10 were performed to obtain an aromatic particle dispersion (dispersion liquid) (particle 18).

[0416] The content of the above methacrylate monomer was 51.5 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 3.0 mass% with respect to the entire polymer component, and the content of the above aromatic component was 15.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 102 nm. The Zeta potential of the functional particles was -2.9 mV.

[0417] (Production Example 19)

[0418] In the above Production Example 10, the amount of distilled water was set to 329.5 parts, the amount of cyclohexyl methacrylate monomer was set to 35 parts, the amount of n-butyl methacrylate was set to 40 parts, and, in addition, myrcene was used as the aromatic component at 25 parts, and an iodoacetylenic compound, 3-iodo-2-propynyl carbamate [omacide IPBC100 manufactured by Lonza Corporation] was used as the antibacterial component at 10 parts, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial and aromatic properties (particle 19).

[0419] The content of the above methacrylate monomer was 50.0 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 5.9 mass% with respect to the entire polymer component, and the content of the above aromatic component was 14.7 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 91 nm. The Zeta potential of the functional particles was -0.2 mV.

[0420] (Production Example 20)

[0421] In the above Production Example 10, the amount of distilled water was set to 329.5 parts, the amount of cyclohexyl methacrylate monomer was set to 35 parts, the amount of n-butyl methacrylate was set to 40 parts, and, in addition, myrcene was used as the aromatic component at 25 parts, and an iodoacetylenic compound, 3-iodo-2-propynyl carbamate [omacide IPBC100 manufactured by Lonza Corporation] was used as the antibacterial component at 10 parts, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial and aromatic properties (particle 19).

[0422] The content of the above methacrylate monomer was 50.0 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 5.9 mass% with respect to the entire polymer component, and the content of the above aromatic component was 14.7 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 111 nm. The Zeta potential of the functional particles was -3.5 mV.

[0423] (Production Example 21)

[0424] In the above Production Example 10, the amount of distilled water was set to 329.5 parts, the amount of cyclohexyl methacrylate monomer was set to 45 parts, the amount of n-butyl methacrylate was set to 30 parts, and, in addition, 25 parts of farnesene as an aromatic component and 10 parts of nipagin [manufactured by Ono Pharmaceutical Co., Ltd.] as an antibacterial component were used, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 21).

[0425] The content of the above methacrylate monomer was 50.0 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 5.9 mass% with respect to the entire polymer component, and the content of the above aromatic component was 14.7 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 84 nm. The Zeta potential of the functional particles was +0.8 mV.

[0426] (Production Example 22)

[0427] In the above Production Example 10, the amount of distilled water was set to 329.5 parts, the amount of cyclohexyl methacrylate monomer was set to 45 parts, the amount of n-butyl methacrylate was set to 30 parts, and, in addition, 25 parts of farnesene as an aromatic component and 10 parts of nipagin [manufactured by Ono Pharmaceutical Co., Ltd.] as an antibacterial component were used, and, other than that, the same operation as in the above Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) having antibacterial properties and aromatic properties (particle 21).

[0428] The content of the above methacrylate monomer was 50.0 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 5.9 mass% with respect to the entire polymer component, and the content of the above aromatic component was 14.7 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 97 nm. The Zeta potential of the functional particles was -6.3 mV.

[0429] Each of the functional particle dispersions (dispersion liquids) having antibacterial properties and aromatic properties obtained in the above Production Examples 10 to 22 was obtained. The solid component amount of the functional particles having antibacterial properties and aromatic properties in each of the functional particle dispersions having antibacterial properties and aromatic properties obtained in the above Production Examples 10 to 22 was 30 to 40 mass%.

[0430] Using the above obtained functional particle dispersions (dispersion liquids) having antibacterial properties and aromatic properties of Production Examples 10 to 22, the fragrance retention intensity, dispersion stability, and antibacterial effect were evaluated by the following evaluation methods.

[0431] As Comparative Production Example 2, in the above Production Example 10, as the polymerizable surfactant, an anionic surfactant (ADEKA REASOAP SE-10N manufactured by ADEKA CORPORATION) was used in an amount of 40 parts, and otherwise, the same operation as in Production Example 10 was performed to obtain a functional particle dispersion (dispersion liquid) (particles) having antibacterial property and fragrance property. The content of the methacrylate monomer in the particles was 53.3 mass% with respect to the entire polymer component constituting the functional particles, the content of the above antibacterial component was 2.0 mass% with respect to the entire polymer component, and the content of the above fragrance component was 11.3 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 61 nm. The Zeta potential of the functional particles was -31.5 mV.

[0432] These results are shown in Table 3 below.

[0433] (Method for evaluating the residual fragrance intensity)

[0434] The functional particle dispersion (dispersion liquid) having antibacterial property and fragrance property obtained in the above Production Examples 10 to 22 and Comparative Production Example 2 was diluted in a beaker so that the solid content became 40 mass%, and cotton cloth (cotton 100%, size 50 x 100 mm) was immersed therein, followed by hand stirring for 30 times, and then left for 15 minutes.

[0435] Next, the water content of the cotton cloth was squeezed by hand, and the cotton cloth was dried under constant temperature and humidity conditions of 25°C and 35% RH for 3 weeks, and used as a treated cloth for evaluation.

[0436] The residual fragrance intensity was evaluated in terms of the sense of smell with respect to the fragrance sensed from each cotton cloth thus obtained, in accordance with the following evaluation criteria.

[0437] <Residual fragrance intensity>

[0438] The residual fragrance intensity was evaluated by 5 evaluators in accordance with the following criteria with respect to the treated cloth for evaluation treated by the above method. The results of the evaluation by 5 persons are shown in Table 1 below.

[0439] (Evaluation criteria for residual fragrance intensity)

[0440] A: Strongly felt residual fragrance

[0441] B: Weakly felt residual fragrance

[0442] C: Residual fragrance not felt

[0443] (Method for evaluating dispersion stability)

[0444] Using the functional particle dispersion (dispersion liquid) having antibacterial property and fragrance property obtained above in Production Examples 10 to 22 and Comparative Production Example 2, 50 ml of each of the obtained functional particle dispersions was filled into a 100-ml plastic bottle of PP with a high degree of transparency and a cap, and after sealing, the cap was made to face upward, and after storage at 40°C for 1 month, the dispersion stability was evaluated in accordance with the following evaluation criteria.

[0445] Evaluation Criteria:

[0446] A: No separation of the dispersion liquid was observed, and no sediment was confirmed in the lower portion, and it was good.

[0447] B: A few separations were observed in the dispersion liquid, and a small amount of sediment was confirmed in the lower portion.

[0448] C: Significant separation was observed in the dispersion liquid, and a large amount of sediment was confirmed in the lower portion.

[0449] (Test method for antibacterial effect)

[0450] Using the functional particle dispersion (dispersion liquid) having antibacterial property and fragrance property obtained above in Production Examples 10 to 22 and Comparative Production Example 2, the microbial test method (challenge test including three groups of bacteria, yeast, and filamentous fungi, evaluation criteria) detailed in Embodiment 1 above according to ISO 11930:2012 (procedure for preservation of efficacy testing or microbiological risk assessment, or interpretation of data generated by both) was performed for the initial stage and after 3 months at 40°C.

[0451] [Table 3]

[0452]

[0453] As is clear from the results in Table 3 above, the functional particle dispersion (dispersion liquid) having antibacterial property and fragrance property obtained above in Production Examples 10 to 22 was superior to Comparative Production Example 2 in terms of fragrance retention intensity, dispersion stability, and antibacterial effect.

[0454] [Embodiment 2: Preparation of water-based ink composition for writing instrument]

[0455] As the water-based ink composition for writing instrument, each of the functional particle dispersion (dispersion liquid) having antibacterial property and fragrance property obtained above in Production Examples 10 to 22 and Comparative Production Example 2 was obtained. The solid content amount of the fragrance particle in each of the fragrance particle dispersions obtained in Production Examples 10 to 22 was 35 to 40 mass%.

[0456] On the other hand, as Comparative Example 5, the functional particle dispersion (dispersion liquid) each having antibacterial property and aromatic property obtained in Comparative Production Example 2 was used. In addition, as Comparative Examples 6 to 8, the following three kinds of known perfumes and antiseptics were used.

[0457] Comparative Example 6 used a fragrance ingredient (d-limonene, manufactured by Nikka Chemicals Co., Ltd.) and an antibacterial ingredient (phenoxyethanol, manufactured by Yashichi Synthetic Co., Ltd.), Comparative Example 7 used a fragrance ingredient 2-phenylethanol (2-phenyl ethanol) [manufactured by Inoue Perfume Manufacturing Co., Ltd.] and an antibacterial ingredient benzisothiazolinone (BIT) [manufactured by Yamada Chemical Industry Co., Ltd.], and Comparative Example 8 used a fragrance ingredient CITRAL [manufactured by Kuraray Co., Ltd.] and an antibacterial ingredient methylisothiazolin (MIT) [manufactured by Yamada Chemical Industry Co., Ltd.]. The preparation of the ink composition for writing instruments was performed so that the fragrance ingredient and the antibacterial ingredient became the same solid content as in Examples 10 to 22.

[0458] Each functional particle dispersion (particles 10 to 22, Comparative Production Example 2, particles of Comparative Example 2) each having antibacterial property and aromatic property manufactured by the above-mentioned Production Examples 10 to 22 and Comparative Production Example 2, and the above-mentioned Comparative Examples 6 to 8 were used to prepare each water-based ink composition for writing instruments by a conventional method using the following compounding composition (total amount 100 mass %) shown below.

[0459] Ink composition: (total amount 100 mass %)

[0460] Coloring agent: colored resin fine particles (4) 15 mass %

[0461] Thickening agent: polysaccharide fiber (5) 0.3 mass %

[0462] Lubricant: phosphate ester (6) 0.5 mass %

[0463] Each functional particle dispersion (Production Examples 10 to 22, Comparative Production Example 2, Comparative Examples 6 to 8) 20 mass %

[0464] pH adjuster (triethanolamine) 1 mass %

[0465] Water-soluble organic solvent (ethylene glycol) 5 mass %

[0466] Water (distilled water) balance

[0467] 4: Thermochromic microcapsule pigment black: average particle diameter 0.6 μm

[0468] 5: Xanthan gum KELSAN S (manufactured by San-Ei Gen F.F.I., Inc.)

[0469] 6: Phosphanol RS-610 (manufactured by DKS Co., Ltd.)

[0470] For each of the obtained writing instrument water-based ink compositions (total amount 100 mass%), the fragrance remaining strength, dispersion stability, and antibacterial performance were evaluated by the following evaluation methods. The evaluation results are shown in Table 4 below.

[0471] (Evaluation method of fragrance remaining strength in writing instrument ink)

[0472] The above obtained writing instrument water-based ink composition was housed in a water-based signing pen [PM-120T: manufactured by Mitsubishi Pencil Co., Ltd., built-in ink storage body, pen core: (fine) PET fiber, (very fine) POM resin, same configuration as follows], and a pen body was produced. Further, after the pen body was stored horizontally at a temperature of 40°C for a period of 1 month, writing was performed on a paper surface (high-quality paper) with the pen core (fine), and the fragrance remaining strength after 24 hours was evaluated by 5 evaluators in accordance with the following criteria.

[0473] Evaluation criteria:

[0474] A: There was fragrance at the time of writing, and the fragrance remaining property of the writing was strongly felt even after 24 hours.

[0475] B: There was fragrance at the time of writing, and the fragrance remaining property of the writing was slightly felt after 24 hours.

[0476] C: There was slight fragrance at the time of writing, but the fragrance remaining property of the writing was not felt after 24 hours.

[0477] (Evaluation method of dispersion stability)

[0478] For the above obtained writing instrument water-based ink composition, PM-120T (manufactured by Mitsubishi Pencil Co., Ltd.) was used, and the fine letter side was stored downward at 40°C for a period of 1 month, and then a circle was drawn on the fine letter side on the writing paper, and evaluation was performed in accordance with the following criteria.

[0479] Evaluation criteria:

[0480] A: Same level as initial writing

[0481] B: Bleeding when writing quickly

[0482] C: Slight bleeding

[0483] D: Poor writing (unable to write)

[0484] For each of the obtained writing instrument water-based ink compositions (total amount 100 mass%), the following microbiological test method according to ISO 11930:2012 (procedure for preservation efficacy testing or microbiological risk assessment, or interpretation of data generated by both) was used.

[0485] In the microbial test method, in order to more strictly confirm the effect of the antibacterial effect, the evaluation method of the above-described embodiment 1 (challenge test of the three groups of bacteria groups, yeasts, and filamentous fungi, evaluation criteria) was carried out with respect to the ink drawn from the pen body after the initial and after the period of 3 months during which the water-based ink composition for each writing instrument was added to the POSCA PC-5M (manufactured by Mitsubishi Pencil Co., Ltd., shaft material: PP resin, stirring ball: stainless steel (φ: 6.4 mm)) and stored at a temperature of 40°C.

[0486] [Table 4]

[0487]

[0488] If Table 4 above is examined, it can be confirmed that Examples 10 to 22, which are within the scope of the present disclosure, do not have an impact on other ink compounding components, and even in compounding systems containing a polysaccharide fiber as a thickening agent, the dispersion stability, the fragrance retention strength, and the antibacterial effect are excellent, as compared with Comparative Examples 5, 6 to 8, which are outside the scope of the present disclosure. In addition, the writing properties of Examples 10 to 22 were also evaluated by writing on paper, and as a result, there was no feathering, and it can be confirmed that the writing lines were good.

[0489] [Embodiment 3: Production Examples 23 to 33: Production of Functional Particle Dispersion (Particles 23 to 33)]

[0490] Each of the functional particle dispersions having a reducing property was produced by the following Production Examples 23 to 33. Note that "parts" below indicates mass parts. The reducing component is the amount of solid component.

[0491] (Production Example 23)

[0492] A stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a 1000-ml separatory funnel for monomer feeding were installed in a 2-L flask, which was set in a warm water bath, and distilled water 324.5 parts, glycerol monomethacrylate [BLEMMER GLM, manufactured by NOF Corporation] 5 parts, 2-ethyl sulfonate sodium methacrylate [acrylate SEM-Na, manufactured by Mitsubishi Chemical Corporation] 5 parts, a nonionic polymerizable surfactant [LATEMUL PD-430, manufactured by Kao Corporation] 40 parts, and ammonium persulfate 0.5 part were fed, and while nitrogen was introduced, the internal temperature was raised to 50°C.

[0493] On the other hand, a liquid was prepared by mixing a reducing component [tannin, manufactured by Fuji Chemical Industry Co., Ltd. (tannic acid S)] 40 parts, a crosslinking agent [triallyl isocyanurate, manufactured by Japan Chemical Industry Co., Ltd., TAIC] 10 parts in a mixed monomer composed of cyclohexyl methacrylate monomer 40 parts and n-butyl methacrylate 35 parts.

[0494] The preparation liquid was added from the above separatory funnel to the above flask, which was kept at a temperature of about 50°C, over a period of 3 hours with stirring, and emulsion polymerization was performed. Further maturation was performed for 5 hours, and the polymerization was completed, to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 23).

[0495] The content of the above methacrylate monomer was 48.6 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 22.9 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 61 nm. The Zeta potential of the functional particles having reducing properties was -7.5 mV.

[0496] (Production Example 24)

[0497] In the above Production Example 23, the amount of distilled water was set to 320.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as the reducing component, a reducing component [Caffeoyl P100 manufactured by Fuji Chemical Industry Co., Ltd.] was used in an amount of 44 parts, and, other than this, the same operations as in the above Production Example 23 were performed, to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 24).

[0498] The content of the above methacrylate monomer was 47.5 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 24.6 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 82 nm. The Zeta potential of the functional particles having reducing properties was -9.8 mV.

[0499] (Production Example 25)

[0500] In the above Production Example 23, the amount of distilled water was set to 313.5 parts, the amount of cyclohexyl methacrylate monomer was set to 60 parts, the amount of n-butyl methacrylate was set to 30 parts, and, as the reducing component, a reducing component [catechin, (-)-catechin from green tea, manufactured by Fuji Photo Film and Otsuka Pharmaceutical Co., Ltd.] was used in an amount of 36 parts, and, other than this, the same operations as in the above Production Example 23 were performed, to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 25).

[0501] The content of the above methacrylate monomer was 53.8 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 19.4 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 107 nm. The Zeta potential of the functional particles having reducing properties was -2.8 mV.

[0502] (Production Example 26)

[0503] In the above Production Example 23, distilled water was set to 299.5 parts, the amount of cyclohexyl methacrylate monomer was set to 60 parts, the amount of n-butyl methacrylate was set to 35 parts, and, as a reducing component, a reducing component [chlorophyll copper, manufactured by FUJIFILM and Chroma Co., Ltd. (chlorophyll copper trisodium salt)] was used in an amount of 45 parts, and, other than this, the same operation as in the above Production Example 23 was performed to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 26).

[0504] The content of the above methacrylate monomer was 52.5 mass% with respect to the entire polymer component that constituted the functional particle, and the content of the above reducing component was 22.5 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 119 nm. The Zeta potential of the functional particle having reducing properties was +5.8 mV.

[0505] (Production Example 27)

[0506] In the above Production Example 23, distilled water was set to 320.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as a reducing component, a reducing component [piceol, manufactured by Morinaga & Co., Ltd. (Pasonol LA)] was used in an amount of 44 parts, and, other than this, the same operation as in the above Production Example 23 was performed to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 27).

[0507] The content of the above methacrylate monomer was 47.5 mass% with respect to the entire polymer component that constituted the functional particle, and the content of the above reducing component was 24.6 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 128 nm. The Zeta potential of the functional particle having reducing properties was +9.1 mV.

[0508] (Production Example 28)

[0509] In the above Production Example 23, distilled water was set to 320.5 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as a reducing component, a reducing component [propyl gallate, manufactured by FUJIFILM and Chroma Co., Ltd.] was used in an amount of 44 parts, and, other than this, the same operation as in the above Production Example 23 was performed to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 28).

[0510] The content of the above methacrylate monomer was 47.5 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 24.6 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 78 nm. The Zeta potential of the functional particles having reducing properties was -8.8 mV.

[0511] (Production Example 29)

[0512] In the above Production Example 23, distilled water was set to 320.0 parts, the amount of cyclohexyl methacrylate monomer was set to 30.5 parts, the amount of n-butyl methacrylate was set to 45 parts, and, as the reducing component, a reducing component [dibutylhydroxytoluene (BHT), "BHT" manufactured by Nikki-Universal Co., Ltd.] was used in an amount of 44 parts, and, other than this, the same operation as in the above Production Example 23 was performed to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 29).

[0513] The content of the above methacrylate monomer was 47.6 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 24.5 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 54 nm. The Zeta potential of the functional particles having reducing properties was -11.7 mV.

[0514] (Production Example 30)

[0515] In the above Production Example 23, distilled water was set to 319.5 parts, the amount of cyclohexyl methacrylate monomer was set to 25 parts, the amount of n-butyl methacrylate was set to 50 parts, and, as the reducing component, a reducing component [butylhydroxyanisole (BHA), "Susten 1-F (BHA)" manufactured by Nikki-Universal Co., Ltd.] was used in an amount of 45 parts, and, other than this, the same operation as in the above Production Example 23 was performed to obtain a functional particle dispersion (dispersion liquid) having reducing properties (particle 30).

[0516] The content of the above methacrylate monomer was 47.2 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 25.0 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 79 nm. The Zeta potential of the functional particles having reducing properties was -6.4 mV.

[0517] (Production Example 31)

[0518] A stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, a 1000 ml separatory funnel for monomer feeding, and distilled water 296.2 parts, glycerol monomethacrylate [BLEMMER GLM, manufactured by Nippon Oil & Fats Corporation] 5 parts, 2-ethylsulfonate sodium methacrylate [acrylate SEM-Na, manufactured by Mitsubishi Chemical Corporation] 5 parts, a nonionic polymerizable surfactant [ADEKA REASOAP ER-20 manufactured by ADEKA Corporation] 53.3 parts, and ammonium persulfate 0.5 part were charged in a 2 liter flask installed in a water bath, and the internal temperature was raised to 50°C while introducing nitrogen.

[0519] On the other hand, a reducing component [tannin, manufactured by Fuji Chemical Industry Co., Ltd. (tannic acid S)] 30 parts, a preservative component [phenoxyethanol, manufactured by Yubkinsyosei Co., Ltd.] 10 parts, and a crosslinking agent [triallyl isocyanurate, manufactured by Nippon Carbide Industries, Ltd., TAIC] 10 parts were mixed in a mixed monomer composed of cyclohexyl methacrylate monomer 50 parts and n-butyl methacrylate 40 parts, and a liquid was prepared.

[0520] The prepared liquid was added to the above flask kept at a temperature of about 50°C over 3 hours with stirring, and emulsion polymerization was performed. Further maturation was performed for 5 hours, and the polymerization was completed, and a functional particle dispersion (dispersion liquid) having reducing property (particle 31) was obtained.

[0521] The content of the above methacrylate monomer was 54.2 mass% with respect to the entire polymer component constituting the functional particle, and the content of the above reducing component was 16.7 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particle was 59 nm. The Zeta potential of the functional particle having reducing property was -8.5 mV.

[0522] (Production Example 32)

[0523] In the above Production Example 31, distilled water was set to 296.2 parts, the amount of cyclohexyl methacrylate monomer was set to 45 parts, and the amount of n-butyl methacrylate was set to 45 parts, and in addition, a reducing component [tannin, manufactured by Fuji Chemical Industry Co., Ltd. (tannic acid S)] 28 parts as a reducing component and benzisothiazolinone ((BIT), manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd.) 12 parts as a preservative component were used, and other than that, the same operation as in the above Production Example 31 was performed, and a functional particle dispersion (dispersion liquid) having reducing property (particle 32) was obtained.

[0524] The content of the above methacrylate monomer was 54.2 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 15.2 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 85 nm. The Zeta potential of the functional particles having reducing properties was -6.8 mV.

[0525] (Production Example 33)

[0526] In the above Production Example 31, distilled water was set to 306.2 parts, the amount of cyclohexyl methacrylate monomer was set to 30 parts, the amount of n-butyl methacrylate was set to 45 parts, and in addition, Caffeoyl P100 manufactured by Fuji Chemical Industry Co., Ltd. was used as the reducing component at 30.5 parts, and methyl isothiazoline (MIT) manufactured by Osa Chemical Industry Co., Ltd. was used as the preservative component at 14.5 parts, and otherwise, the same operation as in the above Production Example 31 was performed to obtain a dispersion liquid of the functional particles dispersion having reducing properties (particles 33).

[0527] The content of the above methacrylate monomer was 48.7 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 17.5 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 106 nm. The Zeta potential of the functional particles having reducing properties was 2.8 mV.

[0528] Each of the functional particles dispersion having reducing properties (dispersion liquid) obtained in the above Production Examples 23 to 33 was obtained. The solid component amount of the functional particles in each of the functional particles dispersion having reducing properties obtained in the above Production Examples 22 to 33 was 35 to 40 mass%.

[0529] Using the functional particles dispersion having reducing properties (dispersion liquid) obtained in the above Production Examples 23 to 33, the durability of the reducing properties (dissolved oxygen removal ability), the dispersion stability, and the antibacterial effect were evaluated by the following evaluation methods.

[0530] In addition, as Comparative Production Example 3, in the above Production Example 23, an anionic surfactant [ADEKA REASOAP SE-10N manufactured by ADEKA Co., Ltd.] was used as the polymerizable surfactant at 40 parts, and otherwise, the same operation as in Production Example 23 was performed to obtain a functional particles dispersion having reducing properties (dispersion liquid) (particles). The content of the methacrylate monomer in the particles was 48.6 mass% with respect to the entire polymer component constituting the functional particles, and the content of the above reducing component was 22.9 mass% with respect to the entire polymer component. In addition, the average particle diameter of the functional particles was 58 nm. The Zeta potential of the functional particles having reducing properties was -51.4 mV.

[0531] These results are shown in Table 5 below.

[0532] (Method for evaluating reducing property)

[0533] Using the functional particle dispersion (dispersion liquid) having reducing property obtained in Production Examples 23 to 33 described above, the reducing property was measured by the amount of dissolved oxygen, whereby evaluation was performed. In the evaluation, using a dissolved oxygen meter: WQ-320 (manufactured by Horiba, Ltd.), after the functional particle dispersion was prepared, it was left to stand at a temperature of 25°C for a period of 48 hours and 3 months, and the persistence of the reducing property at the time of measurement at a measurement temperature of 25°C was evaluated in accordance with the following evaluation criteria.

[0534] Evaluation Criteria:

[0535] A: The amount of dissolved oxygen was 0.1 to less than 10 mg / L.

[0536] B: The amount of dissolved oxygen was 10 to less than 20 mg / L.

[0537] C: The amount of dissolved oxygen was 20 mg / L or more.

[0538] (Method for evaluating dispersion stability)

[0539] Using the functional particle dispersion (dispersion liquid) obtained in Production Examples 23 to 33 described above, 10 ml of each of the obtained functional particle dispersions was filled into a 15-ml glass bottle with a cap together with a stirring ball (φ 6.4 mm, stainless steel), and after sealing, the cap was made to face upward, and after being left to stand at 40°C for 1 month, each of the dispersions was vibrated. The dispersion stability was evaluated in accordance with the following evaluation criteria by the number of times of vibration until the stirring ball started to move in the glass bottle with a cap.

[0540] Evaluation Criteria:

[0541] A: 0 to 3 times.

[0542] B: 4 to 10 times

[0543] C: 11 times or more.

[0544] ※ 0 times: Movement of the stirring ball could be confirmed when the glass bottle with a cap was tilted.

[0545] (Test method for antibacterial effect)

[0546] Using the functional particle dispersion (dispersion liquid) obtained in Production Examples 23 to 33 described above, the following microbiological test method according to ISO 11930:2012 (Procedure for Preservation of Potency Testing or Microbiological Risk Assessment, or Interpretation of Data Generated by Both) was performed.

[0547] The initial and challenge test after 3 months at 40°C were carried out in the following three groups of bacteria, yeast, and filamentous fungi.

[0548] Bacteria: Stapylococcus aureus NBRC13276, Escherichia coli NBRC3972

[0549] Yeast: Candida albicans NBRC1594

[0550] <Preparation of inoculum>

[0551] Preparation of inoculum: The inoculum was prepared in accordance with ISO 11930:2012.

[0552] Bacteria: The inoculum was prepared in accordance with ISO 11930:2012, separately for each species. Each species was adjusted to 1 x 10 7 ~ 1 x 10 8 cfu / ml, and the three were mixed in equal amounts to make the inoculum.

[0553] Yeast: The inoculum was prepared in accordance with ISO 11930:2012, so as to be 1 x 10 6 ~ 1 x 10 7 cfu / ml.

[0554] Filamentous fungi: The inoculum was prepared in accordance with ISO 11930:2012, so as to be 1 x 10 6 ~ 1 x 10 7 cfu / ml.

[0555] <Inoculation>

[0556] The inoculum was inoculated in an amount of 1 mass% relative to the writing instrument ink composition. <Storage> The inoculated writing instrument ink composition was stored at a temperature of 22.5 ± 2.5°C, and detection cultivation was carried out every specified period.

[0557] <Detection cultivation>

[0558] The bacteria were cultivated on SCD agar medium, the yeast on SD agar medium, and the filamentous fungi on PD agar medium, 10 pieces of 1 g each were spread, and the bacteria and the yeast were cultivated at 32.5°C for 2 days, and the filamentous fungi were cultivated at 22.5°C for 5 days.

[0559] <Evaluation criteria>

[0560] A+: No colonies appeared at the time of the third day.

[0561] A: No colonies appeared at the seventh day.

[0562] B: No colonies appeared at the twenty-first day.

[0563] C: Several to several tens of colonies appeared at the twenty-eighth day.

[0564] D: A marked increase at the twenty-eighth day.

[0565] [Table 5]

[0566]

[0567] From the results of the above Table 5, it is known that the functional particle dispersion (dispersion liquid) having reducing properties obtained in Manufacturing Examples 23 to 33 is excellent in all of the sustainability of reducing performance (oxygen removal ability), dispersion stability, and antibacterial effect compared with Comparative Manufacturing Example 3.

[0568] Furthermore, for the functional particle dispersion (dispersion liquid) of Manufacturing Examples 31 to 33, in order to further improve the antibacterial effect, a preservative component is contained together with the reducing component, and compared with the functional particle dispersion (dispersion liquid) having reducing properties of Manufacturing Examples 23 to 30 containing the reducing component, it is confirmed that the antibacterial performance is further improved, and at the same time, no adverse effects on the sustainability, other compounding components, and the like are caused, and the dispersion stability is excellent.

[0569] [This Embodiment 3: Examples 23 to 33 and Comparative Examples 9 to 12: Preparation of Water-based Ink Composition for Writing Instrument]

[0570] As Examples 23 to 33, each of the functional particle dispersion (dispersion liquid) having reducing properties obtained in the above Manufacturing Examples 23 to 33 was obtained. The solid component amount of the functional particle in each of the functional particle dispersion having reducing properties obtained in the above Manufacturing Examples 23 to 33 was 35 to 40 mass%.

[0571] On the other hand, the dispersion of Comparative Manufacturing Example 3 was used as Comparative Example 9. As Comparative Examples 10 to 12, the following three kinds of known oxygen absorbers were used.

[0572] Comparative Example 10 used sodium L-ascorbate, Comparative Example 11 used N-acetyl-cysteine, and Comparative Example 12 used an oligomer (degree of polymerization: 2 to 6) of N-vinyl-2-pyrrolidone.

[0573] Each of the water-based ink compositions for writing instrument was prepared by a conventional method using each of the functional particle dispersion (particles 23 to 33) having reducing properties manufactured by the above Manufacturing Examples 23 to 33, the above Comparative Examples 9 to 12, and the compounding composition (total amount 100 mass%) shown below.

[0574] Ink composition: (100 mass% in total)

[0575] Coloring resin fine particles (7) 50 mass%

[0576] Thickening agent: alkali-swellable emulsion (8) 0.3 mass%

[0577] Lubricant: phosphate ester (9) 0.5 mass%

[0578] Each functional particle dispersion (Production Examples 23 to 33, Comparative Production Example 3, and Comparative Examples 10 to 12) 20 mass%

[0579] pH adjuster (triethanolamine) 1 mass%

[0580] Water-soluble organic solvent (ethylene glycol) 5 mass%

[0581] Water (distilled water) balance

[0582] (7) RUBCOULEUR 224 (SMD) black, manufactured by DAIICHI KAGAKU K.K.

[0583] (8) RHEOTECH 3800, manufactured by Arkema K.K.

[0584] (9) Phosphanol RS-610, manufactured by TOBATA CHEMICAL CO., LTD.

[0585] For each of the obtained water-based ink compositions for writing instruments (100 mass% in total), the following evaluations were performed on the writing properties (difference in line thickness between upward and downward lines), the evaluation of the state of bubble generation over time, and the evaluation of the state of bubble generation after impact using Writing Instruments A and B, and the following evaluation methods.

[0586] Each evaluation result of Examples 23 to 33 and Comparative Examples 9 to 12 is shown in Table 6 below.

[0587] (Production of Writing Instruments: Ballpoint Pens)

[0588] A water-based ballpoint pen was produced by filling each of the above water-based ink compositions into a pen core formed of a polypropylene ink storage tube having a shaft diameter of 6.2 mm and a total length of 129 mm, a stainless steel pen tip (ultra-hard alloy ball, ball diameter 0.5 mm), and a joint connecting the storage tube and the pen tip, using the shaft of a ballpoint pen A [manufactured by MITSUBISHI PENCIL CO., LTD., trade name: SIGNO UM-100], and filling an ink follower containing mineral oil as a main component into the ink rear end.

[0589] Each of the above water-based ink compositions was filled into a refill formed of a polypropylene ink storage tube having a shaft diameter of 6.2 mm and a total length of 112 mm, a stainless steel tip (super-hard alloy ball, ball diameter 0.5 mm), and a joint connecting the storage tube and the tip, using the shaft of a ball-point pen B [manufactured by Mitsubishi Pencil Co., Ltd., trade name: SIGNO UMN-155], and an ink follower mainly composed of mineral oil was filled into the rear end of the ink, to produce a push-type water-based ball-point pen.

[0590] [Method for evaluating writing property (difference in line density between upward and downward lines)]

[0591] Each of the above water-based ball-point pens A was left to stand at room temperature (25°C, likewise hereinafter) for 1 month, and writing was performed to the end of the pen, and the difference in line density between the start of writing and the end of drawing was compared, and evaluation was performed in accordance with the following evaluation criteria.

[0592] Evaluation criteria:

[0593] A: No difference in density.

[0594] B: Slight difference in density was confirmed.

[0595] C: Obvious difference in density was confirmed.

[0596] D: Significant difference in density was confirmed, and a portion where the line was difficult to recognize was confirmed.

[0597] [Method for evaluating the state of bubble generation over time]

[0598] Each of the above ball-point pens A was stored with the tip facing downward in an atmosphere of 50°C, 30% RH for 1 month, and after the lapse of the left-to-stand period, the tip was left to stand at room temperature for 6 hours in a state where the tip was facing downward, and the bubbles appearing at the interface between the ink and the ink follower were visually confirmed, and evaluation was performed in accordance with the following evaluation criteria.

[0599] Evaluation criteria:

[0600] A: No bubbles were present at the interface between the ink and the ink follower.

[0601] B: One bubble having a diameter of less than 1 mm was present at the interface between the ink and the ink follower.

[0602] C: One or more bubbles having a diameter of 1 mm or more, or two or more bubbles having a diameter of less than 1 mm were present at the interface between the ink and the ink follower.

[0603] D: The ink follower was pushed up by the bubbles, and a gap was present between the ink follower and the ink.

[0604] [Method for evaluating the state of bubble generation after impact]

[0605] The push-type ball-point pen B configured as described above was pressed 5 times with the tip facing downward, and then stored with the tip facing downward in an atmosphere of 50°C, 30% RH for 1 week. After the elapse of the period, the pen was left to stand for 6 hours at room temperature in the state with the tip facing downward, and the presence or absence of bubbles at the interface between the ink and the ink follower was visually confirmed. The evaluation was performed in accordance with the following evaluation criteria.

[0606] Evaluation Criteria:

[0607] A: No bubbles were present at the interface between the ink and the ink follower.

[0608] B: One bubble having a diameter of less than 1 mm was present at the interface between the ink and the ink follower.

[0609] C: One or more bubbles having a diameter of 1 mm or more, or two or more bubbles having a diameter of less than 1 mm were present at the interface between the ink and the ink follower.

[0610] D: The ink follower was pushed up by the bubble, and a gap was present between the ink follower and the ink.

[0611] For each of the obtained water-based ink compositions for writing instruments (total amount 100% by mass), the following microbial test method according to ISO 11930:2012 (procedure for preservation efficacy testing or microbiological risk assessment, or interpretation of data generated by both) was used.

[0612] Challenge tests were performed before and after a period of 40°C for 3 months in each of the following three groups of bacteria, yeast, and filamentous fungi. In order to more strictly confirm the antibacterial effect, for each of the water-based ink compositions for writing instruments, the ink was added to a POSCA PC-5M (manufactured by Mitsubishi Pencil Co., Ltd., shaft material: PP resin, stirring ball: stainless steel (φ: 6.4 mm)), and the ink was drawn from the pen body after the ink was stored at a temperature of 40°C for a period of 3 months, and the above-described evaluation method (challenge test for each of the three groups of bacteria, yeast, and filamentous fungi, evaluation criteria) was performed on the ink.

[0613] Bacteria: Stapylococcus aureus NBRC13276, Escherichia coli NBRC3972

[0614] Yeast: Candida albicans NBRC1594

[0615] <Preparation of inoculum>

[0616] Preparation of inoculum: The inoculum was prepared in accordance with ISO 11930:2012.

[0617] Bacterial group: Prepare a bacterial solution for each bacterial species according to ISO 11930:2012. Adjust each bacterial species to 1 x 10 7 ~1 x 10 8 cfu / ml of a bacterial solution, mix the three in equal amounts, and prepare an inoculum solution.

[0618] Yeast: Prepare a bacterial solution according to ISO 11930:2012 so as to be 1 x 10 6 ~1 x 10 7 cfu / ml.

[0619] Mold: Prepare a bacterial solution according to ISO 11930:2012 so as to be 1 x 10 6 ~1 x 10 7 cfu / ml.

[0620] <Inoculation>

[0621] Inoculate the writing instrument ink composition with the bacterial solution in an amount of 1 mass%.

[0622] <Storage>

[0623] Store the inoculated writing instrument ink composition at a temperature of 22.5 ± 2.5°C, and perform a detection culture every specified period. <Detection culture> Spread 10 pieces of 1 g each of the bacterial group on SCD agar medium, the yeast on SD agar medium, and the mold on PD agar medium, and incubate the bacterial group and the yeast at 32.5°C for 2 days and the mold at 22.5°C for 5 days.

[0624] <Evaluation criteria>

[0625] A+: No colonies appear at the time of the third day.

[0626] A: No colonies appear at the time of the seventh day.

[0627] B: No colonies appear at the time of the twenty-first day.

[0628] C: Several to several tens of colonies appear at the time of the twenty-eighth day. D: A significant increase in the number of colonies appears at the time of the twenty-eighth day.

[0629] [Table 6]

[0630]

[0631] If the above Table 6 is examined, it can be confirmed that the embodiments 23 to 33, which are within the scope of the present disclosure, have writing properties (difference in line concentration between upper and lower lines), no bubble generation even after the passage of time, no bubble generation even after the application of an impact, strength and persistence of the oxygen reduction performance (oxygen absorption capacity), and no adverse effects on other ink compounding components, as compared with the comparative examples 9 to 12, which are outside the scope of the present disclosure.

[0632] Further, with respect to the writing instrument aqueous ink composition using the functional particle dispersion (dispersion liquid) having a reducing property of the embodiments 31 to 33, in order to further improve the antibacterial effect, a preservative component is further included together with the reducing component, and as compared with the functional particle dispersion (dispersion liquid) having a reducing property of the embodiments 23 to 30, it is confirmed that the antibacterial performance is further improved, while there are no adverse effects on the persistence effect, other compounding components, and the like, and the dispersion stability is excellent.

[0633] In addition, it is confirmed that each of the ballpoint pens A and B produced as described above has no feathering, no bleeding, has sufficient line concentration, and forms a clear line.

[0634] [Preparation of each cosmetic (Examples 34 to 37)]

[0635] As the examples 34 to 37, each of the functional particle dispersions (dispersion liquids) obtained in the above production examples 1, 10, 11, and 23 was used, and each cosmetic was prepared by a conventional method using the compounding composition (total amount 100 mass%) shown below.

[0636] (Example 34)

[0637] Composition of the eye liner cosmetic: (total amount 100 mass%)

[0638] Functional particle dispersion (production example 1) 20 mass%

[0639] Colorant (pigment): iron oxide *1 14 mass%

[0640] Coating agent: emulsion resin particle *2 14 mass%

[0641] Nonionic surfactant: POE (20) cetyl ether 0.05 mass%

[0642] Additive component: sodium EDTA 0.07 mass%

[0643] Dispersant: polyaspartic acid sodium *3 1 mass%

[0644] Water-based solvent: 1,3-butanediol 10 mass%

[0645] Water-based solvent: water (purified water) balance

[0646] *1TALOX ABL-412HP / R-516P manufactured by Titanium Industries

[0647] *2YODOSOL GH800F manufactured by Nouryon Japan K.K.

[0648] *3AQUADEW SPA-30B manufactured by Ajinomoto (Example 35)

[0649] Composition of eyebrow cosmetic: (total amount 100 mass%)

[0650] Functional particle dispersion (Production Example 10) 10 mass%

[0651] Colorant (pigment): iron oxide *1 10 mass%

[0652] Colorant (pigment): mica *2 5 mass%

[0653] Colorant (pigment): carbon black *3 5 mass%

[0654] Colorant (pigment): titanium dioxide *4 5 mass%

[0655] Coating film forming agent: trimethylsiloxy silicate *5 10 mass%

[0656] Surfactant: sodium stearate 2 mass%

[0657] Oil component: squalane 10 mass%

[0658] Water-based solvent: glycerin 20 mass%

[0659] Water-based solvent: water (purified water) balance

[0660] *1TALOX ABL-412HP / R-516P (manufactured by Titanium Industries)

[0661] *2MICA POWDER Y-2300 (manufactured by YAMAGUCHI MICA CO., LTD.) *3DK BLACK No. 2 (manufactured by DAITOKASEI)

[0662] *4TIPAQUE CR-50 (manufactured by SEIDO CHEMICAL INDUSTRY CO., LTD.)

[0663] *5KF-7312K (manufactured by SHIN-ETU SILICONE CO., LTD.)

[0664] (Example 36)

[0665] Composition of Body Art cosmetic: (total amount 100 mass%) Functional particle dispersion (Production Example 11) 10 mass%

[0666] Film forming agent 115 mass %

[0667] Colorant (dye) Blue No. 1 (C.I. 42090) 5 mass %

[0668] pH adjuster 5 mol / L HC1 1 mass %

[0669] Water-based solvent n-Propyl alcohol 30 mass %

[0670] Water-based solvent: water (purified water) balance

[0671] *1EMUPOLY-CE 119N (manufactured by Gifu Shellac Mfg. Co., Ltd.)

[0672] (Example 37)

[0673] Composition of the hair dye cosmetic: (total amount 100 mass %)

[0674] Functional particle dispersion (Production Example 23) 10 mass %

[0675] Colorant (dye) Black 401 1 mass %

[0676] pH adjuster Lactic acid 2 mass %

[0677] Water-based solvent Benzyl alcohol 10 mass %

[0678] Water-based solvent Ethanol 40 mass %

[0679] Water-based solvent: water (purified water) balance

[0680] For each of the cosmetics obtained in the above Examples 34 to 37, the usability, effects, and the like were evaluated.

[0681] For the eye liner cosmetic obtained in the above Example 34, a pen-type application tool (PEN-1) having a pen nib at an application portion was equipped, and the writing property to the skin, the stability, and the antibacterial effect (regarding the antibacterial effect after a period of 3 months at 40°C, cosmetics in which the cosmetic was filled in the application tool were extracted) were evaluated, and as a result, it was confirmed to be more excellent than Comparative Production Example 1. Figure 1 Figure 1

[0682] ​​The eyebrow cosmetic product obtained in Example 35 was molded into a solid cosmetic (a square shape measuring 3cm x 3cm and 0.5cm in thickness). Its fragrance retention, preservation stability (no separation, etc.), and antibacterial properties were evaluated. The results confirmed that the eyebrow cosmetic product of Example 35 was superior to that of Comparative Example 2. It should be noted that, regarding the antibacterial properties of Example 35, a test bacterial solution was directly sprayed onto the surface of the eyebrow cosmetic product to evaluate the antibacterial properties of the solid cosmetic surface.

[0683] For the body art cosmetic obtained in the above embodiment 36, a pen-type application tool with a brush tip in the application section is used. Figure 1 The fragrance retention strength, dispersion stability, and antibacterial effect were evaluated, and the results confirmed that it was superior to that of the comparative manufacturing example 2.

[0684] The hair dyeing cosmetic obtained in Example 37 above is mounted on a pen-type application tool having a brush tip in the application section. Figure 1 The occurrence of aggregation and antibacterial properties were evaluated, and the results confirmed that they were superior to those of Comparative Manufacturing Example 3. It should be noted that the evaluation of reducing properties was conducted using dissolved oxygen content measurement (using a dissolved oxygen meter: WQ-320 (manufactured by Horiba, Ltd.), measured at 25°C for 48 hours and 3 months of storage, with values ​​measured at 25°C). The dissolved oxygen content was compared with that of Comparative Manufacturing Example 3, confirming that the dissolved oxygen content of the hair dye cosmetics using the reducing particles of this disclosure was consistently low and excellent.

[0685] Industrial availability

[0686] The functional particulate dispersion disclosed herein exhibits excellent dispersion stability, as well as superior antibacterial effects, aromatic properties, and oxygen reduction properties (oxygen absorption capacity). It does not adversely affect other compounding components and is low-irritant even in compounding systems susceptible to ion influence. The functional particles offer a high degree of design freedom and can be used for various applications, such as medical devices, baby products, nursing products, bath products, kitchenware, tableware, drinking water piping components, hygiene products, household appliances, clothing, building materials, agricultural materials, automotive interior parts, stationery, writing instruments, ink compositions for inkjet printers, skincare cosmetics such as lotions and emulsions, makeup cosmetics such as foundation and eyeshadow (liquid or solid), hair products such as hair spray and hair oil, and deodorizing cosmetics.

Claims

1. A functional particulate dispersion, characterized in that, Functional particles consisting of at least a (meth)acrylate monomer represented by the following general formula (I) and at least one antibacterial ingredient selected from group X are dispersed in water, and the zeta potential of the functional particles is measured to be in the range of -15 to +15 mV. In formula (I) above, A is a hydrogen atom (H) or a methyl group (CH3), and R represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a polyalkylene glycol chain having 2 to 18 carbon atoms. The alkyl group or the substituent having the polyalkylene glycol chain may optionally have phenyl, benzyl, epoxy, hydroxyl, dialkylamino, alkoxy, perfluoroalkyl, or trialkoxysilyl groups having 1 to 18 carbon atoms. Group X: Iodopropynyl compounds, thiabendazole, sodium pentachlorophenate, 1,2-benzisothiazolin-3-one, 2,3,5,6-tetrachloro-4-(methanesulfonyl)pyridine, phenol, sodium benzoate, sodium dehydroacetate, potassium sorbate, morpholine, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, sodium salt of 2-mercaptopyridine-1-oxide, sodium salt of 1-hydroxypyridinethione, 2-(4-thiazolyl)benzimidazole Azole, terpinene-4-ol, 1,8-cineole, thymol, diisothiocyanate, eucalyptus oil, longifolene, isopropyl methylphenol, 2-methyl-4-isothiazolin-3-one, citral, eugenol, allyl isothiocyanate, d-limonene, tannic acid, ethylparaben, benzalkonium chloride, glyceryl caprylate, glyceryl fatty acid ester, chlorophenoxyacetic acid, salicylic acid, ethylparaben, butylparaben, propylparaben, methylparaben, bisabolol, physalicylic acid, phenylethanol, 2-phenylethanol, phenoxyethanol, butylparaben, propylparaben, benzalkonium chloride, methylparaben.

2. A functional particulate dispersion, characterized in that, A functional particle, consisting of at least a (meth)acrylate monomer represented by the following general formula (I), at least one antibacterial component selected from group X below, and at least one fragrance component, is dispersed in water, and the zeta potential of the functional particle is measured to be in the range of -15 to +15 mV. In formula (I) above, A is a hydrogen atom (H) or a methyl group (CH3), and R represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a polyalkylene glycol chain having 2 to 18 carbon atoms. The alkyl group or the substituent having the polyalkylene glycol chain may optionally have phenyl, benzyl, epoxy, hydroxyl, dialkylamino, alkoxy, perfluoroalkyl, or trialkoxysilyl groups having 1 to 18 carbon atoms. Group X: Iodopropynyl compounds, thiabendazole, sodium pentachlorophenate, 1,2-benzisothiazolin-3-one, 2,3,5,6-tetrachloro-4-(methanesulfonyl)pyridine, phenol, sodium benzoate, sodium dehydroacetate, potassium sorbate, morpholine, cresol, methylisothiazolinone, chloromethylisothiazolinone, octylisothiazolinone, dichlorooctylisothiazolinone, hexahydro-1,3,5-tris(2-hydroxyethyl)-1,3,5-triazine, 2-bromo-2-nitropropane-1,3-diol, sodium salt of 2-mercaptopyridine-1-oxide, sodium salt of 1-hydroxypyridinethione, 2-(4-thiazolyl)benzimidazole Azole, terpinene-4-ol, 1,8-cineole, thymol, diisothiocyanate, eucalyptus oil, longifolene, isopropyl methylphenol, 2-methyl-4-isothiazolin-3-one, citral, eugenol, allyl isothiocyanate, d-limonene, tannic acid, ethylparaben, benzalkonium chloride, glyceryl caprylate, glyceryl fatty acid ester, chlorophenoxyacetic acid, salicylic acid, ethylparaben, butylparaben, propylparaben, methylparaben, bisabolol, physalicylic acid, phenylethanol, 2-phenylethanol, phenoxyethanol, butylparaben, propylparaben, benzalkonium chloride, methylparaben.

3. A functional particulate dispersion, characterized in that, A functional particle, consisting of at least a (meth)acrylate monomer represented by the following general formula (I) and at least one reducing agent selected from group Z below, is dispersed in water, and the zeta potential of the functional particle is measured to be in the range of -15 to +15 mV. In formula (I) above, A is a hydrogen atom (H) or a methyl group (CH3), and R represents a hydrogen atom (H), an alkyl group having 1 to 22 carbon atoms, or a polyalkylene glycol chain having 2 to 18 carbon atoms. The alkyl group or the substituent having the polyalkylene glycol chain may optionally have phenyl, benzyl, epoxy, hydroxyl, dialkylamino, alkoxy, perfluoroalkyl, or trialkoxysilyl groups having 1 to 18 carbon atoms. Group Z: Polyphenols, copper chlorophyll, flavonoids, anthocyanins, butylated hydroxytoluene, butylated hydroxyanisole.

4. A water-based ink composition for a writing instrument, characterized in that, It comprises the functional particulate dispersion according to any one of claims 1 to 3.

5. A cosmetic product, characterized in that, The functional particulate dispersion comprising any one of claims 1 to 3.

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