Polymers for reducing the formation of microplastic fibers for textiles

Abstract

To provide a new polymer for reducing the generation of microplastic fibers for fibers, capable of reducing the amount of the microplastic fibers generated when fibers or fiber products containing synthetic fibers are washed, etc.SOLUTION: A fiber or a fiber product containing a synthetic fiber is treated by using a polymer for reducing generation of a microplastic fiber for a fiber containing a polymer having a specific constituent unit.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a polymer for reducing the generation of microplastic fibers in textiles, a polymer for treating textiles, a composition for treating textiles, a method for treating textiles, a method for producing textiles, and use of the composition for treating textiles. [Background technology]

[0002] In recent years, there has been growing concern about the impact of plastics on the marine environment, including the risk that tiny plastic particles, such as microplastic beads, may end up in the ocean and become ingested by sea turtles, seabirds, and fish (and ultimately humans). Microplastic pollution also includes microfibers (less than 5mm in length) from synthetic clothing. These synthetic microfibers are shed during textile cleaning (washing, scouring, etc.) and are released into the ocean, coasts, rivers, lakes, etc., and some of them are thought to end up in the soil.

[0003] It is known to use cellulose derivatives as care compounds that can reduce the pilling and fuzzing of clothing. For example, Patent Document 1 discloses a clothing care composition containing (a) a specific nonionic surfactant, (b) a polysaccharide polymer, and (c) a surfactant other than component (a). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-100723 Summary of the Invention [Problem to be solved by the invention]

[0005] However, it has been found that simply reducing friction at the contact points between fibers is not sufficient to suppress the generation of microplastic fibers that are generated from fibers, for example, when the fibers are washed with water. The present invention provides, for example, a novel polymer for reducing the generation of microplastic fibers in fibers, which reduces the amount of microplastic fibers generated from fibers when the fibers are washed with water; a fiber treatment polymer; a fiber treatment composition containing the polymer for reducing the generation of microplastic fibers in fibers; a fiber treatment method; a fiber production method; and the use of the fiber treatment composition to reduce the amount of microplastic fibers emitted from fibers, including synthetic fibers. Microplastic fibers in the present invention refer to fibrous microplastics, with fiber lengths generally ranging from 0.1 μm to less than 5 mm. Microplastic fibers are known to be contained in wastewater from washing textile products containing synthetic fibers, and are thought to be formed by the shedding of some of the synthetic fibers from such textile products. Microplastic fibers refer to synthetic fiber waste and laundry waste. In the present invention, reducing the generation of microplastic fibers means reducing the generation and emission of microplastic fibers from fibers and textile products. In the present invention, "fiber" refers to a fiber containing one or more types of synthetic fibers, and may also contain one or more types of non-synthetic fibers. The fiber in the present invention may be in the form of a thread or a test piece having a predetermined size. Furthermore, products manufactured using the fiber are called "textile products." The "fiber" targeted by the polymer for reducing microplastic fiber generation for textiles and the textile treatment method of the present invention includes both the fiber and the textile product manufactured using the fiber. In the present invention, treating fibers refers to exerting a physical and / or chemical effect on fibers via the polymer for reducing microplastic fiber generation for fibers of the present invention, the fiber treatment polymer, or a fiber treatment composition containing the polymer for reducing microplastic fiber generation described below. The treatment referred to here includes, for example, a washing process that actually removes dirt and impurities from fibers during the washing process. However, the present invention is not limited to washing and may include any physical and / or chemical action on fibers that enables the removal of dirt and impurities from fibers during the manufacturing process of fibers themselves or the recycling process of textile products. Specifically, the treatment in the present invention is preferably at least one of washing and fiber scouring. For example, the washing process includes at least one of a washing process (also referred to as a cleaning process), a rinsing process, a treatment process using a laundry aid such as a fabric softener, or a spin-drying process. Fiber scouring is the removal of impurities adhering to fibers before dyeing, for example, using a surfactant or the like. The washing process in the present invention may be performed using a machine such as a washing machine, or by hand washing. [Means for solving the problem]

[0006] The present invention relates to a polymer for reducing the generation of microplastics in textiles (hereinafter also referred to as component (a)), a polymer for treating textiles (hereinafter also referred to as component (a')), or a composition for treating textiles containing component (a) or component (a').

[0007] The present invention also relates to a method for treating fibers, which includes a step of contacting fibers with a polymer for reducing microplastic generation in fibers, a polymer for fiber treatment, or a fiber treatment composition containing component (a) or component (a') and component (b).

[0008] The present invention also relates to a method for producing fibers obtained by the fiber treatment method.

[0009] The present invention also relates to the use of a fiber treatment composition comprising the following component (a) and the following component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers: [Effects of the Invention]

[0010] According to the present invention, there are provided a novel polymer for reducing the generation of microplastic fibers in fibers or a polymer for fiber treatment that reduces the amount of microplastic fibers generated from fibers, for example, during cleaning, a fiber treatment composition containing the polymer for reducing the generation of microplastic fibers in fibers, a method for treating fibers, a method for producing fibers, and the use of the fiber treatment composition for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, microplastic fibers will also be referred to as "MPF." Unless otherwise specified, the reason why each preferred embodiment is preferred is "from the perspective of further reducing microplastic fibers (MPF) generated from the fibers." The same reason will also be described as "from the perspective of improving the ability to reduce MPF generation."

[0012] <Polymer for textiles to reduce the generation of microplastic fibers> The polymer for reducing the generation of microplastic fibers for fibers of the present invention (hereinafter sometimes referred to as the polymer for reducing the generation of MPFs for fibers) is a polymer containing a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group.

[0013] <Fiber treatment polymer> The polymer for fiber treatment of the present invention is a polymer containing a structural unit (a1) represented by the following general formula (1), a structural unit (a2) represented by the following general formula (2), and a structural unit (a4) represented by the following general formula (4): [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group, provided that R 10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group.

[0014] The polymer used in the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the present invention contains a structural unit (a1) represented by the following general formula (1) from the viewpoint of improving MPF reduction ability. [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; m represents an integer of 1 to 4; Z - indicates the counter anion.)

[0015] Z - is a counter anion of the ammonio group in general formula (1), and is not particularly limited. From the viewpoint of improving MPF reduction ability, examples include one or more anions selected from alkyl sulfate ions having 1 to 3 carbon atoms, (½) sulfate ions, (⅓) phosphate ions, fatty acid ions having 1 to 3 carbon atoms, and halide ions. Among these, from the same viewpoint, preferred are one or more anions selected from alkyl sulfate ions and halide ions having 1 to 3 carbon atoms. Examples of alkyl sulfate ions having 1 to 3 carbon atoms include one or more anions selected from methyl sulfate ions and ethyl sulfate ions. Examples of halide ions include one or more anions selected from fluoride ions, chloride ions, bromide ions, and iodide ions. From the same viewpoint, the anion is preferably one or more anions selected from methyl sulfate ions, ethyl sulfate ions, chloride ions, and bromide ions, more preferably one or more anions selected from methyl sulfate ions, ethyl sulfate ions, and chloride ions. The counter ion of the ammonio group in general formula (1) may be of one type alone or of two or more types.

[0016] R in general formula (1) 1 From the viewpoint of improving the MPF reduction ability, R in general formula (1) is preferably a methyl group. 2 ~R 4 From the same viewpoint, each of X in general formula (1) is independently a hydrogen atom, preferably a methyl group or an ethyl group. From the same viewpoint, X in general formula (1) is preferably -O-. From the same viewpoint, m in general formula (1) is preferably 2 or 3, more preferably 2.

[0017] The structural unit (a1) of general formula (1) can be introduced into the polymer, for example, by polymerizing an olefin represented by the following general formula (1a). [ka] (In the formula, R 1 , R 2 , R 3 , R 4 , X, m and Z - (These are the same as above.)

[0018] The polymer used in the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the present invention contains a structural unit (a2) having the following general formula (2) from the viewpoint of improving MPF reduction ability. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group.

[0019] R 6 or R 8 Examples of the (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group represented by the formula (I) include a hydroxymethylcarbonyl group, a 1-hydroxyethylcarbonyl group, a 2-hydroxyethylcarbonyl group, a 3-hydroxypropylcarbonyl group, a 4-hydroxybutylcarbonyl group, etc. From the viewpoint of improving the MPF reduction ability, the 2-hydroxyethylcarbonyl group is preferred.

[0020] R 6 or R 8The (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group represented by the formula (I) represents a group in which a nitrogen atom of an azacycloaliphatic or aromatic hydrocarbon in which at least one of the carbon atoms constituting the ring of the cyclic aliphatic or aromatic hydrocarbon has been substituted with a nitrogen atom replaces a hydrogen atom of the methyl group. Specific examples include a (pyrrol-1-yl)methyl group, an (indol-1-yl)methyl group, a (pyrrolidin-1-yl)methyl group, and a (pyrrolidon-1-yl)methyl group. From the viewpoint of improving MPF reduction ability, a (pyrrolidon-1-yl)methyl group is preferred.

[0021] The structural unit (a2) represented by general formula (2) can be introduced into the polymer by, for example, polymerizing an olefin represented by the following general formula (2a) as a raw material. [ka] (In the formula, R 5 , R 6 , R 7 and R 8 indicates the same content as the previous period.)

[0022] As the olefin of general formula (2a), from the viewpoint of improving the MPF reduction ability, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and N-vinylpyrrolidone are preferred.

[0023] In the present invention, for example, an olefin represented by the general formula (1a) and an olefin represented by the general formula (2a) can be polymerized to obtain a polymer containing a structural unit represented by the general formula (3). The polymer containing a structural unit represented by the general formula (3) is a schematic representation of a polymer containing a structural unit (a1) represented by the general formula (1) and a structural unit (a2) represented by the general formula (2), which is obtained by polymerizing an olefin represented by the general formula (1a) and an olefin represented by the general formula (2a), and is not limited to the structure represented by the following general formula (3). [ka] (In the formula, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , X, m and Z - p1 and q1 represent the content of structural units derived from olefin (1a) and olefin (2a), respectively, and 0 <p1<1かつ0<q1<1かつp1+q1≦1である。)

[0024] From the viewpoint of improving the MPF reduction ability, p1 in general formula (3) is preferably 0.05 or more, more preferably 0.1 or more, and even more preferably 0.15 or more, and from the viewpoint of economic efficiency, it is preferably 0.8 or less, more preferably 0.6 or less, and even more preferably 0.4 or less. Furthermore, from the viewpoint of improving the MPF reduction ability, q1 in general formula (3) is preferably 0.2 or more, more preferably 0.4 or more, and even more preferably 0.6 or more, and from the same viewpoint, it is preferably 0.9 or less, more preferably 0.8 or less, and even more preferably 0.7 or less.

[0025] In general formula (3), p1 is the content of the structural unit (a1) represented by general formula (1) and q1 is the content of the structural unit (a2) represented by general formula (2), and the sum of p1+q1 is, from the viewpoint of improving the MPF reduction ability, preferably 0.5 or more, more preferably 0.7 or more, even more preferably 0.9 or more, still more preferably 0.95 or more, and even more preferably 0.97 or more, and is 1 or less. p1+q1 may be 1.

[0026] In the polymer containing the structural unit (a1) represented by the general formula (1) and the structural unit (a2) represented by the general formula (2), p1, which is the content of the structural unit derived from the olefin (1a), and q1 and p1+q1, which are the contents of the structural unit derived from the olefin (2a), have the same meanings as p1, q1, and p1+q1 described for the structural unit represented by the general formula (3).

[0027] The copolymerization of olefin (1a) and olefin (2a) may be carried out under ordinary copolymerization conditions, and may be any of alternating copolymerization, block copolymerization, and random copolymerization. That is, general formula (3) also includes copolymers containing a region in which structural unit (1) derived from olefin (1a) or structural unit (2) derived from olefin (2a) are continuous, and copolymers in which structural unit (1) and / or structural unit (2) are polymerized in reverse left and right directions relative to the plane of the paper.

[0028] The polymer used in the polymer for reducing MPF generation for fibers of the present invention preferably contains a structural unit (a4) represented by general formula (4) from the viewpoint of improving MPF reduction ability. Furthermore, the polymer used in the polymer for fiber treatment of the present invention contains a structural unit (a4) represented by general formula (4) from the viewpoint of improving MPF reduction ability. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group, provided that R 10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group.

[0029] R 10 or R 12Examples of the sulfophenyl group represented by the formula (I) include a 2-sulfophenyl group, a 3-sulfophenyl group, a 4-sulfophenyl group, etc. From the viewpoint of improving the MPF reducing ability, the 4-sulfophenyl group is preferred.

[0030] R 10 or R 12 Examples of the (alkylamino)carbonyl group having 1 to 4 carbon atoms substituted with at least one sulfo group include a (sulfomethyl)aminocarbonyl group, a (2-sulfoethyl)aminocarbonyl group, a (1-sulfoethyl)aminocarbonyl group, a (3-sulfopropyl)aminocarbonyl group, and a (1,1-dimethyl-2-sulfoethyl)aminocarbonyl group. From the viewpoint of improving the MPF reduction ability, a (1,1-dimethyl-2-sulfoethyl)aminocarbonyl group is preferred.

[0031] The structural unit (a4) represented by general formula (4) can be introduced into the polymer by polymerizing, for example, an olefin represented by the following general formula (4a) as a raw material. [ka] (In the formula, R 9 , R 10 , R 11 , R 12 (These are the same as above.)

[0032] From the viewpoint of improving the MPF reduction ability, the olefin of general formula (4a) is preferably acrylic acid, methacrylic acid, maleic acid, o-, m-, or p-vinylphenylsulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, or a salt thereof. In the case of a salt, examples of the counter cation include an alkali metal ion, an alkaline earth metal ion, an ammonium ion, and a tetraalkylammonium ion. In terms of easy availability, an alkali metal ion is preferred, and a sodium ion is more preferred.

[0033] In the present invention, for example, an olefin represented by the general formula (1a), an olefin represented by the general formula (2a), and an olefin represented by the general formula (4a) can be polymerized to obtain a polymer containing a structural unit represented by the general formula (5). The polymer containing a structural unit represented by the general formula (5) is a schematic representation of a polymer containing a structural unit (a1) represented by the general formula (1), a structural unit (a2) represented by the general formula (2), and a structural unit (a4) represented by the general formula (4), which is obtained by polymerizing an olefin represented by the general formula (1a), an olefin represented by the general formula (2a), and an olefin represented by the general formula (4a), and is not limited to the structure represented by the following general formula (5). [ka] (In the formula, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , X, m and Z - p2, q2, and r2 represent the content of structural units derived from olefins (1a), (2a), and (4a), respectively; <p2<1かつ0<q2<1かつ0<r2<1かつp2+q2+r2≦1である。)

[0034] From the viewpoint of improving the MPF reduction ability, p2 in general formula (5) is preferably 0.025 or more, more preferably 0.05 or more, even more preferably 0.075 or more, and still more preferably 0.1 or more, and from the viewpoint of economic efficiency, it is preferably 0.8 or less, more preferably 0.6 or less, even more preferably 0.4 or less, and still more preferably 0.2 or less. Furthermore, from the viewpoint of improving the MPF reduction ability, q2 in general formula (5) is preferably 0.2 or more, more preferably 0.4 or more, even more preferably 0.5 or more, and still more preferably 0.6 or more, and from the same viewpoint, it is preferably 0.95 or less, more preferably 0.9 or less, even more preferably 0.85 or less, and still more preferably 0.8 or less. Furthermore, from the viewpoint of improving the MPF reduction ability, r2 in general formula (5) is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.02 or more, still more preferably 0.04 or more, and is preferably 0.8 or less, more preferably 0.6 or less, even more preferably 0.5 or less, and still more preferably 0.4 or less.

[0035] In general formula (5), the ratio of the content of the structural unit (a1) of general formula (1) to the content of the structural unit (a2) of general formula (2), p2 / q2, is preferably 0.01 or more, more preferably 0.05 or more, even more preferably 0.07 or more, and still more preferably 0.1 or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 1 or less, more preferably 0.8 or less, even more preferably 0.7 or less, and still more preferably 0.5 or less.

[0036] When general formula (4) is included, the ratio of the content of the structural unit (a1) of general formula (1) in general formula (5) to the content of the structural unit of general formula (4), p2 / r2, is preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.5 or more, and even more preferably 1 or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 5 or less, more preferably 4 or less, even more preferably 3.5 or less, and still more preferably 3 or less.

[0037] When general formula (4) is included, the ratio of the contents of the structural units in general formula (5), (p2+r2) / q2, is preferably 0.05 or more, more preferably 0.06 or more, even more preferably 0.08 or more, and still more preferably 0.1 or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 5 or less, more preferably 4 or less, even more preferably 3.5 or less, and still more preferably 3 or less.

[0038] In general formula (5), p2 is the content of the structural unit (a1) represented by general formula (1), q2 is the content of the structural unit (a2) represented by general formula (2), and r2 is the content of the structural unit (a4) represented by general formula (4), and the sum of p2 + q2 + r2 is, from the viewpoint of improving the MPF reduction ability, preferably 0.5 or more, more preferably 0.7 or more, even more preferably 0.9 or more, still more preferably 0.95 or more, and even more preferably 0.97 or more, and is 1 or less. p2 + q2 + r2 may be 1.

[0039] In the polymer containing the structural unit (a1) represented by the general formula (1), the structural unit (a2) represented by the general formula (2), and the structural unit (a4) represented by the general formula (4), p2, which is the content of the structural unit derived from olefin (1a), q2, which is the content of the structural unit derived from olefin (2a), and r2 and p2+q2+r2, which are the contents of the structural unit derived from olefin (4a), have the same meanings as p2, q2, r2, and p2+q2+r2 described for the structural unit represented by the general formula (5).

[0040] The olefin (4a) of the present invention can be introduced into a polymer by any of the following methods: copolymerization of olefin (1a) and olefin (2a) followed by copolymerization of olefin (4a); copolymerization of olefin (1a) and olefin (4a) followed by copolymerization of olefin (2a); copolymerization of olefin (2a) and olefin (4a) followed by copolymerization of olefin (1a); or simultaneous copolymerization of olefin (1a), olefin (2a), and olefin (4a). The copolymerization may be carried out under conventional copolymerization conditions, and may be alternating polymerization, block polymerization, or random polymerization. In other words, general formula (5) includes copolymers containing a region in which the structural unit (1) derived from olefin (1a), the structural unit (2) derived from olefin (2a), and the structural unit (4) derived from olefin (4a) are consecutive, as well as copolymers in which the structural unit (1) and / or the structural unit (2) and / or the structural unit (4) are polymerized in reverse order relative to the plane of the paper.

[0041] The weight average molecular weight of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment of the present invention is, from the viewpoint of improving the ability to reduce MPF generation, preferably 50,000 or more, more preferably 70,000 or more, even more preferably 80,000 or more, still more preferably 90,000 or more, still more preferably 100,000 or more, and still more preferably 200,000 or more, and, from the viewpoint of ease of preparation of the fiber treatment composition described below, is preferably 10,000,000 or less, more preferably 5,000,000 or less, still more preferably 3,000,000 or less, still more preferably 2,000,000 or less, still more preferably 1,000,000 or less, and still more preferably 800,000 or less.

[0042] The weight average molecular weight of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment is calculated in terms of polyethylene glycol by GPC (gel permeation chromatography). The measurement conditions are as follows: Column: TSKgel α-M Eluent: 50mmol / L LiBr, 1% CH3COOH, ethanol / water = 3 / 7 ·Temperature: 40℃ ·Flow rate: 0.6mL / min

[0043] <Fiber treatment composition> The fiber treatment composition of the present invention contains the above-mentioned component (a) or (a'). From the viewpoint of further improving the MPF reduction ability of component (a) or (a'), the fiber treatment composition of the present invention preferably contains component (a) or (a') and component (b), which is an anionic surfactant.

[0044] <Anionic surfactants> The fiber treatment composition of the present invention can further improve the MPF reduction ability of component (a) or (a') by using component (b), an anionic surfactant, in combination with component (a) or (a'). Generally, anionic surfactants have the effect of, for example, releasing dirt, such as organic matter, adhering to fibers from the fibers and discharging it into water. However, the present invention is characterized in that, by using component (a) or (a') in combination with component (a), the generation of MPF from synthetic fibers and the discharge of MPF into water can be suppressed in fibers containing synthetic fibers. Although the mechanism of action is not necessarily limited, it is presumed that the adhesion of a complex consisting of component (a) or (a') and component (b) to fibers containing synthetic fibers suppresses the discharge of MPF from the synthetic fibers. In this regard, an anionic surfactant is selected as the compound because it has a hydrophobic portion that can form a complex with component (a) or (a') to inhibit MPF from synthetic fibers, and an anionic group that easily interacts with the cationic charge of component (a) or (a').

[0045] From the viewpoint of further improving the MPF reduction ability of component (a) or component (a'), component (b) is preferably one or more anionic surfactants selected from alkylarylsulfonic acid surfactants, sulfate ester surfactants, alkanesulfonic acid surfactants, olefinsulfonic acid surfactants, alkyl sulfosuccinate ester surfactants, and sulfofatty acid ester surfactants.

[0046] Examples of alkylarylsulfonic acid surfactants include alkylbenzenesulfonates. Specifically, from the viewpoint of further improving the MPF reduction ability of component (a) or (a'), alkylbenzenesulfonates having an alkyl group with preferably 6 or more carbon atoms, more preferably 8 or more carbon atoms, and from the same viewpoint, preferably 18 or less, more preferably 15 or less carbon atoms. The carbon atom of the alkyl group bonded to the carbon atom of the benzene ring of the alkylbenzenesulfonate may be a secondary carbon atom.

[0047] Examples of sulfate ester surfactants include anionic surfactants having a hydrocarbon group having from 8 to 20 carbon atoms and a sulfate ester group. From the viewpoint of further improving the MPF reduction ability of component (a) or (a'), the hydrocarbon group preferably has 8 or more carbon atoms, more preferably 10 or more, and even more preferably 12 or more carbon atoms, and from the same viewpoint, preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less. The hydrocarbon group is preferably an alkyl group. Examples of sulfate surfactants include alkyl sulfates and polyoxyalkylene alkyl ether sulfates.

[0048] As the alkyl sulfate ester salt, from the viewpoint of further improving the MPF reducing ability of component (a) or (a'), the number of carbon atoms is preferably 8 or more, more preferably 10 or more, and from the same viewpoint, alkyl groups of preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less, and further alkyl groups having straight-chain or branched chains are suitable.

[0049] The polyoxyalkylene alkyl ether sulfate salt is preferably a polyoxyalkylene alkyl ether sulfate salt having an alkyl group of preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less, a linear or branched alkyl group, from the viewpoint of further improving the MPF reduction ability of component (a) or (a'), and an average added mole number of oxyalkylene groups having from 2 to 3 carbon atoms is preferably 0.5 or more, more preferably 0.7 or more, even more preferably 1.0 or more, and from the same viewpoint, preferably 10 or less, more preferably 8 or less, and even more preferably 7 or less. The oxyalkylene group is preferably an oxyalkylene group having from 2 to 4 carbon atoms, and more preferably an oxyalkylene group having from 2 to 3 carbon atoms. Specific examples of the oxyalkylene group having from 2 to 4 carbon atoms include an oxyethylene group, an oxypropylene group, and an oxybutylene group. From the viewpoint of further improving the MPF reduction ability, the polyoxyalkylene group is preferably one or more selected from an oxyethylene group and an oxypropylene group. The polyoxyalkylene group may be a polyoxyalkylene group consisting of a single type of oxyalkylene group or a polyoxyalkylene group consisting of multiple types of oxyalkylene groups. From the viewpoint of further improving the MPF reduction ability, the polyoxyethylene group consisting of multiple types of oxyethylene groups is preferably a polyoxyalkylene group containing an oxyethylene group and an oxypropylene group. In the present invention, "containing an oxyethylene group and an oxypropylene group" means that the polyoxyethylene group is obtained by adding an oxyethylene group and an oxypropylene group to an alkyl alcohol as a raw material. From the viewpoint of further improving the MPF reduction ability, m1 / m2, which is the ratio of the average number of moles of oxyethylene groups added (m1) to the average number of moles of oxypropylene groups added (m2), is preferably 0.1 or more, more preferably 0.2, and from the same viewpoint, is preferably 10 or less, more preferably 8 or less.When the oxyethylene group and the oxypropylene group are contained, the respective groups may be added randomly or in blocks, and from the viewpoint of further improving the MPF reduction ability, it is preferable that the groups are added in blocks. From the viewpoint of further improving the MPF reducing ability of component (a) or component (a'), the oxyalkylene group is preferably an oxyalkylene group having 2 carbon atoms.

[0050] From the viewpoint of further improving the MPF reducing ability of component (a) or (a'), the alkane sulfonate surfactant is an alkane sulfonate having an alkane moiety with preferably 8 or more carbon atoms, more preferably 10 or more carbon atoms, and even more preferably 14 or more carbon atoms, and from the same viewpoint, preferably 20 or less carbon atoms, more preferably 18 or less carbon atoms. From the viewpoint of further improving the MPF reducing ability, secondary alkane sulfonates are preferred.

[0051] Examples of olefin sulfonic acid surfactants include α-olefin sulfonates and internal olefin sulfonates. From the viewpoint of further improving the MPF reduction ability of component (a) or (a'), the α-olefin sulfonate has an olefin moiety with preferably 8 or more carbon atoms, more preferably 10 or more, and even more preferably 14 or more carbon atoms, and from the same viewpoint, preferably 22 or less, more preferably 20 or less, even more preferably 18 or less, and still more preferably 16 or less carbon atoms. Furthermore, the internal olefin sulfonate has an olefin moiety with preferably 8 or more carbon atoms, more preferably 12 or more, and even more preferably 16 or more carbon atoms, and from the same viewpoint, preferably 24 or less, more preferably 20 or less, and even more preferably 18 or less carbon atoms. From the viewpoint of further improving the MPF reduction ability of component (a) or (a'), an internal olefin sulfonate having a carbon number of 16 is preferred.

[0052] From the viewpoint of further improving the MPF reducing ability of component (a) or (a'), the sulfosuccinate alkyl ester surfactant is a monoester and / or diester, preferably a diester, of sulfosuccinic acid with a fatty alcohol having a carbon number of preferably 5 or more, more preferably 6 or more, even more preferably 7 or more, and still more preferably 8 or more, and from the same viewpoint, preferably 18 or less, more preferably 14 or less, and even more preferably 10 or less. From the viewpoint of further improving the MPF reducing ability of component (a) or (a'), the fatty alcohol is preferably a branched alcohol.

[0053] Examples of sulfofatty acid ester surfactants include α-sulfofatty acid salts in which the fatty acid moiety has 10 to 18 carbon atoms, and α-sulfofatty acid lower alkyl ester salts in which the fatty acid moiety has 10 to 18 carbon atoms and the ester moiety has 1 to 5 carbon atoms.

[0054] Examples of salts of component (b) include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as magnesium salts, ammonium salts, and organic amine salts such as monoethanolamine salts, diethanolamine salts, and triethanolamine salts.

[0055] From the viewpoint of improving the MPF reduction ability, component (b) is preferably one or more anionic surfactants selected from alkylaryl sulfonates, polyoxyalkylene alkyl ether sulfates, and olefin sulfonates, and more preferably one or more anionic surfactants selected from alkylaryl sulfonates and olefin sulfonates. From the viewpoint of improving the MPF reduction ability, the alkylaryl sulfonates are preferably alkylbenzene sulfonates, and the olefin sulfonates are preferably internal olefin sulfonates.

[0056] The fiber treatment composition of the present invention containing component (a) or (a') and component (b) may contain a mixture of component (a) or (a') and component (b) in the fiber treatment composition, but is not limited to this embodiment. A fiber treatment composition containing component (a) or (a') and component (b) in which component (a) or (a') and component (b) are separately blended and contained in the fiber treatment composition described below, and component (a) or (a') and component (b) coexist in the fiber treatment composition, is also referred to as a fiber treatment composition containing component (a) or (a') and component (b). The fiber treatment composition of the present invention may also be a fiber treatment composition having MPF reduction ability. Having MPF reduction ability means that the MPF release rate is less than 100% in the examples of the present application. A higher MPF reduction ability means that the MPF release rate is lower. The preferred MPF excretion rate is preferably 90% or less, more preferably 80% or less, even more preferably 70% or less, still more preferably 60% or less, still more preferably 50% or less, still more preferably 40% or less, still more preferably 30% or less, with lower values ​​being even more preferred.

[0057] Furthermore, in the fiber treatment composition of the present invention containing component (a) or component (a') and component (b), the mass ratio of the content of component (a) or the content of component (a') to the content of component (b), [(a) or (a') / (b)], is preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.05 or more, and still more preferably 0.1 or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 5 or less, more preferably 2 or less, even more preferably 1 or less, and still more preferably 0.5 or less.

[0058] From the viewpoint of ease of handling, the fiber treatment composition of the present invention preferably contains a solvent, and particularly preferably water. The water is preferably impurity-free and appropriately purified water. The water may be well water or industrial water, and from the viewpoint of improving the MPF reduction ability, tap water, purified water, or ion-exchanged water is preferred. Water may be the balance other than the fiber treatment composition containing component (a) or component (a') and optional component (b), and the optional components described below. From the viewpoint of the stability of the fiber treatment composition of the present invention, the fiber treatment composition of the present invention contains water in an amount of preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, and from the same viewpoint, preferably 99.99999% by mass or less, more preferably 99.9999% by mass or less, even more preferably 99.999% by mass or less, still more preferably 90% by mass or less, still more preferably 85% by mass or less, and even more preferably 80% by mass or less.

[0059] When the fiber treatment composition of the present invention contains water, the content of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the fiber treatment composition is, from the viewpoint of improving MPF reduction ability, preferably 0.1 mg / kg or more, more preferably 0.3 mg / kg or more, even more preferably 0.5 mg / kg or more, still more preferably 0.7 mg / kg or more, still more preferably 1 mg / kg or more, still more preferably 1.5 mg / kg or more, and still more preferably 2 mg / kg or more, and from the viewpoint of enabling uniform contact with fibers or reducing polymer emissions into the environment, preferably 5% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less, still more preferably 1% by mass or less, still more preferably 0.7% by mass or less, still more preferably 0.5% by mass or less, and still more preferably 0.3% by mass or less. Furthermore, from the viewpoint of improving the MPF reduction ability, the content of component (b) in the fiber treatment composition is preferably 0.1 mg / kg or more, more preferably 0.5 mg / kg or more, even more preferably 1 mg / kg or more, still more preferably 3 mg / kg or more, still more preferably 5 mg / kg or more, still more preferably 10 mg / kg or more, and still more preferably 2 mg / kg or more, and from the viewpoint of being able to contact the fibers uniformly, it is preferably 50 mass% or less, more preferably 40 mass% or less, even more preferably 35 mass% or less, still more preferably 30 mass% or less, still more preferably 20 mass% or less, still more preferably 15 mass% or less, and still more preferably 10 mass% or less.

[0060] When the fiber treatment composition of the present invention contains water and is a fiber treatment composition (1) to be used by diluting with a solvent, preferably water, and contacting fibers, the content of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the fiber treatment composition (1) of the present invention is, from the viewpoint of improving the MPF reduction ability, preferably 0.03% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.07% by mass or more, still more preferably 0.08% by mass or more, and still more preferably 0.1% by mass or more, and from the viewpoint of being able to contact fibers uniformly or reducing polymer emissions into the environment, preferably 5% by mass or less, more preferably 3% by mass or less, even more preferably 2% by mass or less, still more preferably 1.5% by mass or less, and still more preferably 1% by mass or less. The content of component (b) in the fiber treatment composition (1) is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, even more preferably 0.3% by mass or more, still more preferably 0.4% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of improving the MPF reduction ability, and is preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 35% by mass or less, and still more preferably 30% by mass or less, from the viewpoint of ensuring uniform contact with the fibers.

[0061] When the fiber treatment composition of the present invention is a fiber treatment composition (2) that contains a solvent, preferably water, and is to be used by contacting fibers directly, the content of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the fiber treatment composition (2) is, from the viewpoint of improving MPF reduction ability, preferably 0.1 mg / kg or more, more preferably 0.3 mg / kg or more, even more preferably 0.5 mg / kg or more, still more preferably 0.7 mg / kg or more, still more preferably 1 mg / kg or more, still more preferably 1.5 mg / kg or more, still more preferably 2 mg / kg or more, and from the viewpoint of being able to contact fibers uniformly, from the viewpoint of reducing polymer emissions into the environment, or from the viewpoint of improving MPF reduction ability, preferably 300 mg / kg or less, more preferably 200 mg / kg or less, even more preferably 100 mg / kg or less, still more preferably 70 mg / kg or less, still more preferably 50 mg / kg or less, still more preferably 30 mg / kg or less, still more preferably 20 mg / kg or less. From the viewpoint of improving the MPF reduction ability, the content of component (b) is preferably 0.1 mg / kg or more, more preferably 0.3 mg / kg or more, even more preferably 0.5 mg / kg or more, still more preferably 0.8 mg / kg or more, still more preferably 1 mg / kg or more, still more preferably 2 mg / kg or more, still more preferably 3 mg / kg or more, and from the same viewpoint, it is preferably 5,000 mg / kg or less, more preferably 2,000 mg / kg or less, even more preferably 1,000 mg / kg or less, still more preferably 750 mg / kg or less, still more preferably 500 mg / kg or less, still more preferably 400 mg / kg or less, and still more preferably 300 mg / kg or less. The fiber treatment composition (2) may be a fiber treatment composition obtained by diluting the fiber treatment composition (1) with water.

[0062] When the fiber treatment composition of the present invention contains water, the pH of the fiber treatment composition at 25°C, measured by the method described below, is preferably 4 or more, more preferably 5 or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 12 or less, more preferably 11 or less. [pH measurement method] A pH measurement composite electrode (HORIBA glass ground sleeve type) is connected to a pH meter (HORIBA pH / ion meter F-23) and powered on. A saturated potassium chloride aqueous solution (3.33 mol / L) is used as the pH electrode internal solution. Next, a pH 4.01 standard solution (phthalate standard solution), a pH 6.86 standard solution (neutral phosphate standard solution), and a pH 9.18 standard solution (borate standard solution) are each filled into a 100 mL beaker and immersed in a thermostatic bath at 25°C for 30 minutes. The pH measurement electrode is immersed in the thermostatically adjusted pH 6.86 standard solution for 3 minutes, followed by the pH 9.18 standard solution and the pH 4.01 standard solution for 3 minutes each, for calibration. The sample to be measured (the fiber treatment composition of the present invention when it contains water) is then adjusted to 25°C, and the pH meter electrode is immersed in the sample. The pH is measured after 1 minute.

[0063] When the fiber treatment composition of the present invention is filled into a container equipped with a sprayer and used, the viscosity at 25°C of the fiber treatment composition of the present invention is preferably 15 mPa·s or less, more preferably 10 mPa·s or less, and even more preferably 5 mPa·s or less, from the viewpoint of good sprayability from a container equipped with a sprayer, and from the same viewpoint, is preferably 1.0 mPa·s or more, more preferably 1.5 mPa·s or more, and even more preferably 2.0 mPa·s or more. The viscosity of the fiber treatment composition was measured by attaching a No. 1 rotor to a B-type viscometer (model BM) manufactured by Tokyo Keiki Inc., filling the fiber treatment composition into a 200 mL tall glass beaker, adjusting the temperature to 25±0.3°C in a water bath, setting the rotor rotation speed to 60 rpm, and measuring the indicated value 60 seconds after the start of the measurement. The viscosity of the fiber treatment composition can be adjusted by adjusting the content of the fiber MPF generation reducing polymer or fiber treatment polymer.

[0064] <Additional Optional Ingredients> The fiber treatment composition of the present invention may further contain, as optional components, components known to be used in detergents, fabric softeners, etc., such as the following components (1) to (12), within a range that does not affect the effects of the present invention.

[0065] (1) pH adjuster An acidic or alkaline agent may be contained as a pH adjuster. The acid agent may be one or more selected from organic acids and inorganic acids. From the viewpoint of low residue on fibers, the organic acid may be one or more selected from citric acid, malic acid, acetic acid, succinic acid, tartaric acid, fumaric acid, lactic acid, propionic acid, oxalic acid, glutaric acid, adipic acid, gallic acid, mellitic acid, cinnamic acid, salicylic acid, phthalic acid, benzoic acid, pyruvic acid, oxaloacetic acid, and aconitic acid. The inorganic acid may be one or more selected from hydrochloric acid, phosphoric acid, sulfuric acid, boric acid, and carbonic acid. Examples of alkaline agents include inorganic alkaline agents such as alkali metal hydroxides and alkali metal carbonates, and alkanolamines in which one to three of the groups bonded to the nitrogen atom are alkanol groups having from 2 to 4 carbon atoms, and the remaining groups are alkyl groups having from 1 to 4 carbon atoms or hydrogen atoms. Of these, the alkanol group is preferably a hydroxyalkyl group, and more preferably a hydroxyethyl group. Other than the alkanol group, a hydrogen atom or a methyl group is preferred, with a hydrogen atom being particularly preferred. Examples of alkanolamines include alkanolamines such as 2-aminoethanol, N-methylethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, diethanolamine, N-methyldiethanolamine, and triethanolamine.

[0066] (2) Chelating agents Specific examples of chelating agents include aminopolyacetic acids such as ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethyliminodiacetic acid, or salts thereof; organic acids such as citric acid, lactic acid, tartaric acid, and malic acid, or salts thereof; 1-hydroxyethylidene-1,1-diphosphonic acid, diethylenetriaminepenta(methylenephosphonic acid), and alkali metal or lower amine salts thereof.

[0067] (3) Anti-redeposition agents and / or polymeric dispersants From the viewpoint of low residue on fibers, examples of the anti-redeposition agent and / or polymer-based dispersant include polyacrylic acid, polymaleic acid, carboxymethyl cellulose, and the like.

[0068] (4) Bleach From the viewpoint of low residue on fibers, examples of bleaching agents include hydrogen peroxide, sodium percarbonate, and sodium perborate.

[0069] (5) Bleach activator Examples of bleach activators include tetraacetylethylenediamine and bleach activators represented by formulas (I-2) to (I-7) of JP-A-6-316700.

[0070] (6) Enzymes From the viewpoint of low residue on fibers, the enzyme may be one or more enzymes selected from amylase, sucrase, maltase, lactase, pullulanase, fructofuranosidase, cellulase, protease, and lipase.

[0071] (7) Fluorescent dyes Examples of the fluorescent dye include fluorescent dyes commercially available under the trade names of Tinopal CBS (trade name, manufactured by Ciba Specialty Chemicals) and Whitex SA (trade name, manufactured by Sumitomo Chemical Co., Ltd.).

[0072] (8) Antioxidants Antioxidants include known antioxidant compounds such as 3,5-bis(1,1-dimethylethyl)-4-hydroxy-benzenepropanoic acid, methyl ester (commercially available under the trade name RALOX® 35 from Raschig USA, Arlington, Texas, United States), butylhydroxytoluene (common name: BHT), butylhydroxyanisole (common name: BHA), distyrenated cresol, ascorbic acid (common name: vitamin C), tocopherol (common name: vitamin E), coffee bean extract (chlorogenic acid), and green tea extract (catechin), or known inorganic salts such as sodium sulfite and sodium bisulfite.

[0073] (9) Antifoaming agents such as pigments, antibacterial preservatives, UV inhibitors, and silicones

[0074] (10) Organic solvents containing hydroxyl groups As the organic solvent having a hydroxyl group, one or more compounds selected from the following components (10-1) to (10-6) are used.

[0075] Component (10-1): A monohydric alcohol having an aliphatic hydrocarbon group with 2 to 6 carbon atoms Examples of the component (10-1) include monohydric alcohols selected from ethanol, 1-propanol, 2-propanol, and 1-butanol.

[0076] (10-2) Component: Dihydric to hexahydric alcohol having 2 to 6 carbon atoms Examples of the component (10-2) include dihydric or trihydric alcohols selected from ethylene glycol, propylene glycol, butylene glycol, 2-methyl-2,4-pentanediol, 1,5-pentanediol, 1,6-hexanediol, and glycerin. 2-Methyl-2,4-pentanediol is also known as hexylene glycol.

[0077] Component (10-3): Polyalkylene glycol containing alkylene glycol units having 2 to 4 carbon atoms Examples of the component (10-3) include polyalkylene glycols selected from diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycols having a weight-average molecular weight of 400 to 4,000, and polypropylene glycols having a weight-average molecular weight of 400 to 4,000.

[0078] Component (10-4): a monoalkyl ether of (mono- or poly) alkylene glycol having an alkylene glycol unit having from 2 to 4 carbon atoms and an alkyl group having from 1 to 4 carbon atoms Examples of the component (10-4) include compounds selected from diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, diethylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monomethyl ether, diethylene glycol monobutyl ether, 1-methoxy-2-propanol, and 1-ethoxy-2-propanol.

[0079] Component (10-5): Alkyl glyceryl ether having an alkyl group with 1 to 8 carbon atoms Examples of the component (10-5) include alkyl glyceryl ethers selected from 1-methyl glyceryl ether, 2-methyl glyceryl ether, 1,3-dimethyl glyceryl ether, 1-ethyl glyceryl ether, 1,3-diethyl glyceryl ether, triethyl glyceryl ether, 1-pentyl glyceryl ether, 2-pentyl glyceryl ether, 1-octyl glyceryl ether, and 2-ethylhexyl glyceryl ether.

[0080] (10-6) Component: Aromatic alkyl ether of (mono- or poly-) alkylene glycol having an alkylene glycol unit having 2 or 3 carbon atoms Examples of the component (10-6) include compounds selected from 2-phenoxyethanol, diethylene glycol monophenyl ether, triethylene glycol monophenyl ether, polyethylene glycol monophenyl ether having an average molecular weight of about 480, 2-benzyloxyethanol, and diethylene glycol monobenzyl ether.

[0081] In the above components (10-4) and (10-6), the term "(mono- or poly)alkylene glycol" refers to a monoalkylene glycol or a polyalkylene glycol. Furthermore, "polyalkylene glycol" refers to a glycol containing 2 to 9 alkylene glycol units.

[0082] (11) Hydrotropic agents The hydrotropic agent is an organic compound having an anionic group, and examples thereof include alkylbenzenecarboxylic acids or alkylbenzenesulfonic acids or salts thereof containing one or two alkyl groups selected from methyl, ethyl, and propyl and one sulfonic or carboxylic acid group, as well as benzoic acid or its salts. More specifically, examples include paratoluenesulfonic acid, cumenesulfonic acid, metaxylenesulfonic acid, and benzoic acid, and the salts are preferably alkali metal salts.

[0083] (12)Fragrance The perfume has a masking effect and in some cases may be a base material that itself has deodorizing properties. As the fragrance, for example, the fragrances described in "Fundamentals of Fragrance and Fragrance Blending, edited by Nakajima Mototaka, published by Sangyo Tosho Co., Ltd., 4th printing, April 20, 2005" and the fragrances described in JP-A-10-507793 can be used. In addition, the fragrance technology described in JP-A-2014-213072 can be used, and silicate ester fragrances and microcapsule fragrances can also be used.

[0084] <Fiber> The fibers to be treated with the polymer for reducing MPF generation for fibers, the polymer for fiber treatment, or the fiber treatment composition of the present invention are fibers containing one or more synthetic fibers, and may also contain one or more non-synthetic fibers. The fibers in the present invention may be in the form of threads or test pieces having a predetermined size.

[0085] Examples of synthetic fibers include polyamide fibers (e.g., nylon), polyester fibers (e.g., polyester), polyacrylonitrile fibers (e.g., acrylic), polyvinyl alcohol fibers (e.g., vinylon), polyvinyl chloride fibers (e.g., polyvinyl chloride), polyvinylidene chloride fibers (e.g., vinylidene), polyolefin fibers (e.g., polyethylene, polypropylene), polyurethane fibers (e.g., polyurethane), polyvinyl chloride / polyvinyl alcohol copolymer fibers (e.g., polycrelal), polyalkylene paraoxybenzoate fibers (e.g., benzoate), and polyfluoroethylene fibers (e.g., polytetrafluoroethylene). Other examples include semi-synthetic fibers made by chemically extracting, dissolving, and spinning naturally occurring components, such as protein-based fibers (e.g., milk protein casein fiber, Promix), and cellulose-based fibers (e.g., rayon, Polynosic, cupra, acetate).

[0086] <Textile products> The fiber treatment composition of the present invention can also be used to treat textile products. As described above, the textile product in the present invention refers to a product manufactured using fibers. Specifically, it refers to fabrics such as woven fabrics, knitted fabrics, and nonwoven fabrics manufactured using fibers containing one or more synthetic fibers, and products obtained using the same, such as undershirts, T-shirts, dress shirts, blouses, slacks, hats, handkerchiefs, towels, knitwear, socks, underwear, tights, and masks. From the viewpoint of improving the MPF reduction ability, the content of synthetic fibers in the textile product is preferably 5% by mass or more, more preferably 10% by mass or more, even more preferably 20% by mass or more, still more preferably 30% by mass or more, still more preferably 50% by mass or more, and 100% by mass or less. The content of synthetic fibers in the textile product is even more preferably substantially 100% by mass.

[0087] The polymer for reducing MPF generation for fibers or the polymer for fiber treatment of the present invention can be incorporated into a fiber detergent composition, a fiber softener composition, a fiber treatment composition, or a fiber spray treatment composition, and the fiber treatment composition of the present invention can be used together with these compositions.

[0088] <Textile processing method> The present invention provides a method for treating fibers, which comprises the step of contacting the fibers with a fiber treatment composition.

[0089] In the fiber treatment method of the present invention, the preferred embodiments described above for the fiber treatment composition of the present invention can be applied to component (a), component (a'), component (b), and the optional components. Further, examples of the fibers include the fibers described in the polymers for reducing MPF generation for fibers, the polymers for fiber treatment, and the compositions for fiber treatment, and fibers including synthetic fibers contained in textile products.

[0090] In the fiber treatment method of the present invention, from the viewpoint of improving the MPF reduction ability, the fiber is preferably treated with the fiber treatment composition (2) (hereinafter, sometimes referred to as the treatment liquid). In the fiber treatment method of the present invention, methods for contacting the fiber with the fiber treatment composition of the present invention include spraying the treatment liquid onto the fiber, applying the treatment liquid onto the fiber, and immersing the fiber in the treatment liquid.

[0091] The method for treating fibers of the present invention may be, for example, a method for washing fibers that reduces the amount of MPF generated from synthetic fibers when the fibers are washed.

[0092] The method of spraying the treatment liquid onto fibers is preferably a method in which the treatment liquid of the present invention is filled into a sprayer-equipped container and sprayed onto fibers to bring the treatment liquid into contact with the fibers. When applying the treatment liquid to fibers, the treatment liquid may be applied directly to the fibers, or may be carried on an applicator such as a cloth or brush and applied to the fibers to bring the treatment liquid into contact with the fibers.

[0093] The treatment liquid is preferably prepared by diluting the fiber generation reducing polymer or fiber treatment polymer or fiber treatment composition (1) of the present invention with water. The specific dilution ratio of the fiber treatment composition (1) of the present invention is preferably 500 times or more, more preferably 800 times or more, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 5000 times or less, more preferably 3000 times or less.

[0094] The pH of the treatment solution at 25° C. is preferably 4 or higher, more preferably 5 or higher, from the viewpoint of improving the MPF reduction ability, and from the same viewpoint, is preferably 12 or lower, more preferably 11 or lower. The pH of the treatment liquid at 25° C. can be measured by the same method as the method for measuring the pH of the blended liquid of the present invention. In this case, the blended liquid of the MPF reducer for fibers or the fiber treatment composition is read as the treatment liquid containing the MPF reducer for fibers or the fiber treatment composition, and the pH of the treatment liquid is measured.

[0095] The hardness of the water used in preparing the treatment solution is, from the viewpoint of improving the MPF reduction ability, preferably 2°dH or more, more preferably 3.5°dH or more, even more preferably 5°dH or more, and even more preferably 7°dH or more on the German hardness scale, and from the same viewpoint, preferably 20°dH or less, more preferably 18°dH or less, and even more preferably 15°dH or less.

[0096] Here, German hardness (°dH) in this specification refers to the concentration of calcium and magnesium in water, expressed as a CaCO3 equivalent concentration of 1 mg / L (ppm) = approximately 0.056°dH (1°dH = 17.8 ppm). The calcium and magnesium concentrations for this German hardness are determined by chelate titration using disodium ethylenediaminetetraacetic acid. The specific method for measuring German water hardness in this specification is described below.

[0097] <German method for measuring water hardness> 〔reagent〕 0.01 mol / L EDTA·2Na solution: 0.01 mol / L aqueous solution of disodium ethylenediaminetetraacetic acid (titration solution, 0.01 M EDTA-2Na, manufactured by SIGMA-ALDRICH) ·Universal BT indicator (product name: Universal BT, manufactured by Dojindo Kagaku Kenkyusho Co., Ltd.) Ammonia buffer solution for hardness measurement (67.5 g of ammonium chloride dissolved in 570 mL of 28 w / v% ammonia water, and then made up to 1000 mL with ion-exchanged water) [Measurement of hardness] (1) Use a volumetric pipette to collect 20 mL of sample water into a conical beaker. (2) Add 2 mL of ammonia buffer solution for hardness measurement. (3) Add 0.5 mL of Universal BT indicator. After addition, confirm that the solution is reddish purple. (4) While shaking the conical beaker well, add 0.01 mol / L EDTA·2Na solution dropwise from the buret until the sample water turns blue, which is the end point of the titration. (5) The total hardness is calculated using the following formula. Hardness (°dH)=T×0.01×F×56.0774×100 / A T:0.01mol / L Titration amount of EDTA・2Na solution (mL) A: Sample volume (20 mL, volume of sample water) F: Factor of 0.01 mol / L EDTA·2Na solution

[0098] Furthermore, from the viewpoint of improving the MPF reduction ability, the temperature of the treatment liquid when treating the fibers is preferably 5°C or higher, more preferably 10°C or higher, and even more preferably 20°C or higher, and from the same viewpoint, it is preferably 60°C or lower, more preferably 50°C or lower, and even more preferably 40°C or lower.

[0099] In the fiber treatment method of the present invention, the liquor ratio, which is the ratio of the mass (kg) of the fiber to the amount (L) of the treatment solution, i.e., [amount of treatment solution (L) / mass (kg) of fiber] (hereinafter, this ratio may be referred to as the liquor ratio), is, from the viewpoint of improving the MPF reduction ability, preferably 2 or more, more preferably 3 or more, even more preferably 4 or more, still more preferably 5 or more, still more preferably 6 or more, still more preferably 7 or more, still more preferably 10 or more, still more preferably 12 or more, and from the same viewpoint, preferably 200 or less, more preferably 100 or less, still more preferably 80 or less, still more preferably 50 or less, still more preferably 30 or less, still more preferably 25 or less, more preferably 20 or less, still more preferably 18 or less.

[0100] In the fiber treatment method of the present invention, the time for treating the fibers is, from the viewpoint of improving the MPF reduction ability, preferably 10 seconds or more, more preferably 20 seconds or more, even more preferably 30 seconds or more, still more preferably 1 minute or more, more preferably 2 minutes or more, even more preferably 3 minutes or more, and from the same viewpoint, preferably 5 hours or less, more preferably 3 hours or less, even more preferably 1 hour or less, still more preferably 50 minutes or less, still more preferably 30 minutes or less, and even more preferably 15 minutes or less.

[0101] The textile treatment method of the present invention is also suitable for a rotary treatment method. A rotary treatment method refers to a treatment method in which fibers or textile products that are not fixed to a rotating device rotate around a rotation axis together with a treatment solution. The rotary treatment method can be carried out using a rotary washing machine. Specific examples of rotary washing machines include top-loading washing machines, two-layer washing machines, drum washing machines, pulsator washing machines or agitator washing machines, small washing machines, and automatic loading washing machines. These rotary washing machines can be commercially available for home or industrial use.

[0102] In the method for treating fibers of the present invention, it is preferable to bring fibers into contact with a treatment liquid containing a polymer for reducing MPF generation or a polymer for fiber treatment and an anionic surfactant.

[0103] [Dehydration process] After the washing step, for example, before the step of contacting the textile product obtained in the washing step with a treatment liquid containing component (A), component (B), and water, a dehydration step can be carried out to dehydrate the textile product washed in the washing step. The dehydration step is a step of reducing the amount of washing liquid present with the textile product. By carrying out the dehydration step, the amount of detersive surfactant carried over with the textile product can be reduced. The dehydration step after the washing step is preferable because it further improves the texture of the textile product obtained by the textile product treatment method of the present invention.

[0104] In the textile product treatment method of the present invention, a dehydration step of dehydrating the textile product can be carried out after the step of contacting the textile product with a treatment liquid containing component (A), component (B), and water. The dehydration step is a step of reducing the amount of treatment liquid present with the textile product in the textile product treatment method of the present invention. By carrying out the dehydration step, the drying time described below can be shortened, and the textile The product is now ready to wear.

[0105] [Rinsing process] A rinsing step can be carried out after the textile product has been contacted with the treatment solution, or between the washing step and the textile product treatment method of the present invention. In the present invention, the rinsing step after the washing step refers to a step in which the textile product obtained in the washing step is brought into contact with fresh water to reduce the amount of detergent surfactant carried over with the textile product. The hardness and temperature of the water used in the rinsing step may be the same as or different from those used in the treatment method of the present invention and the washing step. The rinsing step can be carried out multiple times.

[0106] [Drying process] A drying step for drying the textile product may be carried out between the washing step and the textile product treating method of the present invention, or after the textile product treating method of the present invention. The drying step is a step for reducing the amount of water present in the textile product. Drying may be either natural drying or heat drying. Each drying step can be carried out multiple times.

[0107] [Method for producing fibers] The present invention provides a method for producing fibers obtained by the above-described fiber treatment method. In the fiber production method of the present invention, the components (a), (a'), and (b), the optional components, and the fiber treatment composition can be the preferred embodiments described above for the fiber treatment composition of the present invention. Also, in the fiber production method of the present invention, the fiber treatment method, dewatering step, rinsing step, and drying step can be the preferred embodiments described above for the fiber treatment method.

[0108] The present invention provides use of a fiber treatment composition comprising the following component (a) and the following component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers: Component (a): A polymer containing a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. (b) Component: Anionic surfactant. In the fiber manufacturing method of the present invention, the component (a), the component (b), the optional components, and the fiber treatment composition can be applied with the preferred embodiments described above for the fiber treatment composition of the present invention.

[0109] In the use of the fiber treatment composition containing the following component (a) and component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers, the polymer used in the polymer for reducing MPF generation for fibers of the present invention preferably contains a structural unit (a4) represented by general formula (4), from the viewpoint of improving MPF reduction ability. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group, provided that R 10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group.

[0110] The present invention also provides use of a fiber treatment composition comprising the following component (a') and the following component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers: Component (a'): A polymer for fiber treatment comprising a structural unit (a1) represented by the following general formula (1), a structural unit (a2) represented by the following general formula (2), and a structural unit (a4) represented by the following general formula (4): [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group, provided that R10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. (b) Component: Anionic surfactant.

[0111] In addition to the above-described embodiments, the present invention discloses the following aspects.

[0112] <1> A polymer for reducing the generation of microplastic fibers for textiles, comprising a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group.

[0113] <2> p1, the content of the structural unit (a1) of the general formula (1), is 0.05 or more, preferably 0.1 or more, more preferably 0.15 or more, and 0.8 or less, preferably 0.6 or less, more preferably 0.4 or less; and q1, the content of the structural unit (a2) of the general formula (2), is 0.2 or more, preferably 0.4 or more, more preferably 0.6 or more, and 0.9 or less, preferably 0.8 or less, more preferably 0.7 or less. <1> The polymer for reducing the generation of microplastic fibers for textiles according to claim 1.

[0114] <3> the sum of p1, which is the content of the structural unit (a1) represented by the general formula (1), and q1, which is the content of the structural unit (a2) represented by the general formula (2), (p1+q1) is 0.5 or more, more preferably 0.7 or more, preferably 0.9 or more, more preferably 0.95 or more, and even more preferably 0.97 or more, and is 1 or less; <1> or <2> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0115] <4> The polymer (a) for reducing the generation of microplastic fibers for textiles further contains a structural unit (a4) represented by the following general formula (4): <1> ~ <3> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. 10 or R12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group.

[0116] <5> The structural unit (a2) of the general formula (2) is introduced into the polymer by a polymerization reaction using one or more monomers selected from 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and N-vinylpyrrolidone. <1> ~ <4> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0117] <6> The structural unit (a4) of the general formula (4) is introduced into the polymer by a polymerization reaction using one or more monomers or salts thereof selected from acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, and styrenesulfonic acid. <2> ~ <5> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0118] <7> In the general formula (1), R 1 is a methyl group, and R 2 , R 3 and R 4 are each independently an alkyl group having 1 to 4 carbon atoms, X is -O- or -NH-, m is an integer of 2 or 3, and Z - is one or more anions selected from alkyl sulfate ions and halide ions having 1 to 3 carbon atoms, <1> ~ <6> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0119] <8> the content (p2) of the structural unit (a1) of the general formula (1) is 0.025 or more, preferably 0.05 or more, more preferably 0.075 or more, and even more preferably 0.1 or more, and is 0.8 or less, preferably 0.6 or less, more preferably 0.4 or less, and even more preferably 0.2 or less; the content (q2) of the structural unit (a2) of the general formula (2) is 0.2 or more, preferably 0.4 or more, more preferably 0.5 or more, and even more preferably 0.6 or more, and is 0.95 or less, preferably 0.9 or less, more preferably 0.85 or less, and even more preferably 0.8 or less; the content (r2) of the structural unit (a4) of the general formula (4) is 0.005 or more, preferably 0.01 or more, more preferably 0.02 or more, even more preferably 0.04 or more, and is 0.8 or less, preferably 0.6 or less, more preferably 0.5 or less, even more preferably 0.4 or less; <2> ~ <7> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0120] <9> the ratio of the content (p2) of the structural unit (a1) of the general formula (1) to the content (q2) of the structural unit (a2) of the general formula (2), p2 / q2, is 0.01 or more, preferably 0.05 or more, more preferably 0.07 or more, even more preferably 0.1 or more, and is 1 or less, preferably 0.8 or less, more preferably 0.7 or less, even more preferably 0.5 or less; <2> ~ <8> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0121] <10> the ratio of the content (p2) of the structural unit (a1) of the general formula (1) to the content (r2) of the structural unit (a4) of the general formula (4), p2 / r2, is 0.1 or more, preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 1 or more, and is 5 or less, preferably 4 or less, more preferably 3.5 or less, and more preferably 3 or less; <2> ~ <9> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0122] <11> the ratio of the contents of the structural units in the general formula (5), (p2+r2) / q2, is 0.05 or more, preferably 0.06 or more, more preferably 0.08 or more, and even more preferably 0.1 or more, and is 5 or less, preferably 4 or less, more preferably 3.5 or less, and even more preferably 3 or less; <2> ~ <10> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0123] <12> the sum of p2, which is the content of the structural unit (a1) represented by general formula (1), q2, which is the content of the structural unit (a2) represented by general formula (2), and r2, which is the content of the structural unit (a4) represented by general formula (4), (p2+q2+r2) is 0.5 or more, preferably 0.7 or more, more preferably 0.9 or more, even more preferably 0.95 or more, and still more preferably 0.97 or more, and is 1 or less; <2> ~ <11> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0124] <13> The weight average molecular weight of the polymer is 50,000 or more, preferably 70,000 or more, more preferably 80,000 or more, even more preferably 90,000 or more, still more preferably 100,000 or more, even more preferably 200,000 or more, and is 10,000,000 or less, preferably 5,000,000 or less, more preferably 3,000,000 or less, even more preferably 2,000,000 or less, still more preferably 1,000,000 or less, even more preferably 800,000 or less. <1> ~ <12> The polymer for reducing the generation of microplastic fibers for textiles according to any one of the above.

[0125] <14> A polymer for fiber treatment comprising a structural unit (a1) represented by the following general formula (1), a structural unit (a2) represented by the following general formula (2), and a structural unit (a4) represented by the following general formula (4): [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. 10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group.

[0126] <15> The structural unit (a2) of the general formula (2) is introduced into the polymer by a polymerization reaction using one or more monomers selected from 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and N-vinylpyrrolidone. <14> The polymer for fiber treatment according to claim 1.

[0127] <16> The structural unit (a4) of the general formula (4) is introduced into the polymer by a polymerization reaction using one or more monomers or salts thereof selected from acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, and styrenesulfonic acid. <13> or <15> The polymer for fiber treatment according to claim 1.

[0128] <17> In the general formula (1), R 1 is a methyl group, and R 2 , R 3 and R 4 are each independently an alkyl group having 1 to 4 carbon atoms, X is -O- or -NH-, m is an integer of 2 or 3, and Z - is one or more anions selected from alkyl sulfate ions and halide ions having 1 to 3 carbon atoms, <14> ~ <16> The polymer for fiber treatment according to any one of the above.

[0129] <18> The content (p2) of the structural unit (a1) of the general formula (1) is 0.025 or more, preferably 0.05 or more, more preferably 0.075 or more, and even more preferably 0.1 or more, and is 0.8 or less, preferably 0.6 or less, more preferably 0.4 or less, and even more preferably 0.2 or less. the content (q2) of the structural unit (a2) of the general formula (2) is 0.2 or more, preferably 0.4 or more, more preferably 0.5 or more, and even more preferably 0.6 or more, and is 0.95 or less, preferably 0.9 or less, more preferably 0.85 or less, and even more preferably 0.8 or less; the content (r2) of the structural unit (a4) of the general formula (4) is 0.005 or more, more preferably 0.01 or more, even more preferably 0.02 or more, still more preferably 0.04 or more, and is 0.8 or less, preferably 0.6 or less, more preferably 0.5 or less, even more preferably 0.4 or less; <14> ~ <17> The polymer for fiber treatment according to any one of the above.

[0130] <19> the ratio of the content (p2) of the structural unit (a1) of the general formula (1) to the content (q2) of the structural unit (a2) of the general formula (2), p2 / q2, is 0.01 or more, preferably 0.05 or more, more preferably 0.07 or more, even more preferably 0.1 or more, and is 1 or less, preferably 0.8 or less, more preferably 0.7 or less, and even more preferably 0.5 or less; <14> ~ <18> The polymer for fiber treatment according to any one of the above.

[0131] <20> the ratio (p2) of the content (p2) of the structural unit (a1) of general formula (1) to the content (r2) of the structural unit (a4) of general formula (4), p2 / r2, is 0.1 or more, preferably 0.3 or more, more preferably 0.5 or more, and even more preferably 1 or more, and is 5 or less, preferably 4 or less, more preferably 3.5 or less, and more preferably 3 or less; <14> ~ <19> The polymer for fiber treatment according to any one of the above.

[0132] <21> the ratio of the sum of the content (p2) of the structural unit (a1) of general formula (1) and the content (r2) of the structural unit (a4) of general formula (4) to the content (q2) of the structural unit (a2) of general formula (2), (p2+r2) / q2, is 0.05 or more, preferably 0.06 or more, more preferably 0.08 or more, and even more preferably 0.1 or more, and is 5 or less, preferably 4 or less, more preferably 3.5 or less, and even more preferably 3 or less; <14> ~ <20> The polymer for fiber treatment according to any one of the above.

[0133] <22> the sum of p2, which is the content of the structural unit (a1) represented by general formula (1), q2, which is the content of the structural unit (a2) represented by general formula (2), and r2, which is the content of the structural unit (a4) represented by general formula (4), (p2+q2+r2) is 0.5 or more, preferably 0.7 or more, more preferably 0.9 or more, even more preferably 0.95 or more, and still more preferably 0.97 or more, and is 1 or less; <14> ~ <21> The polymer for fiber treatment according to any one of the above.

[0134] <23> The weight average molecular weight of the polymer is 50,000 or more, preferably 70,000 or more, more preferably 80,000 or more, even more preferably 90,000 or more, still more preferably 100,000 or more, even more preferably 200,000 or more, and 10,000,000 or less, preferably 5,000,000 or less, more preferably 3,000,000 or less, even more preferably 2,000,000 or less, still more preferably 1,000,000 or less, even more preferably 800,000 or less; <14> ~ <22> The polymer for fiber treatment according to any one of the above.

[0135] <24> (a) As a component, <1> ~ <12> The polymer for reducing the generation of microplastic fibers for textiles or component (a') described in any one of the above is <14> ~ <23> 1. A fiber treatment composition comprising the polymer for fiber treatment according to any one of claims 1 to 9.

[0136] <25> Furthermore (b) Component: Anionic surfactant containing <24> The fiber treatment composition according to claim 1.

[0137] <26> The component (b) is one or more anionic surfactants selected from alkylarylsulfonic acid surfactants, sulfate ester surfactants, alkanesulfonic acid surfactants, olefinsulfonic acid surfactants, sulfosuccinic acid alkyl ester surfactants, and sulfofatty acid ester surfactants. <25> The fiber treatment composition according to claim 1.

[0138] <27> the alkylarylsulfonic acid surfactant, which is the component (b), is an alkylbenzenesulfonate having an alkyl group having from 8 to 15 carbon atoms, and the carbon atom of the alkyl group bonded to a carbon atom of a benzene ring of the alkylbenzenesulfonate may be a secondary carbon atom; The sulfate ester surfactant is an alkyl sulfate salt or a polyoxyalkylene alkyl ether sulfate salt, the alkyl sulfate salt being an alkyl sulfate salt having an alkyl group having from 12 to 14 carbon atoms, the polyoxyalkylene alkyl ether sulfate salt having a linear or branched alkyl group having from 10 to 14 carbon atoms, and the average number of moles of oxyalkylene groups added having from 2 to 3 carbon atoms is preferably 0.5 or more, more preferably 0.7 to 7, the oxyalkylene group being at least one selected from an oxyethylene group and an oxypropylene group, the alkane sulfonic acid surfactant is an alkane sulfonate having an alkane moiety with 10 to 18 carbon atoms, and is preferably a secondary alkane sulfonate; The olefin sulfonic acid surfactant is an α-olefin sulfonate or an internal olefin sulfonate, and the α-olefin sulfonate has an olefin moiety with a carbon number of 14 to 18, and the internal olefin sulfonate has an olefin moiety with a carbon number of 16 to 18, The sulfosuccinic acid alkyl ester surfactant is a monoester and / or diester, preferably a diester, of a fatty alcohol having 7 to 18 carbon atoms and sulfosuccinic acid, and the fatty alcohol is preferably a branched alcohol; the sulfo fatty acid ester surfactant is an α-sulfo fatty acid salt having 10 to 18 carbon atoms in the fatty acid moiety, or an α-sulfo fatty acid lower alkyl ester salt having 10 to 18 carbon atoms in the fatty acid moiety and 1 to 5 carbon atoms in the ester moiety; The salt of component (b) is an alkali metal salt such as a sodium salt or a potassium salt, an alkaline earth metal salt such as a magnesium salt, an ammonium salt, or an organic amine salt such as a monoethanolamine salt, a diethanolamine salt, or a triethanolamine salt, <26> The fiber treatment composition according to claim 1.

[0139] <28> <24> ~ <27> The fiber treatment composition according to any one of the above items contains water, and the content of the component (a) or (a') in the fiber treatment composition is 0.1 mg / kg or more, preferably 0.3 mg / kg or more, more preferably 0.5 mg / kg or more, even more preferably 0.7 mg / kg or more, still more preferably 1 mg / kg or more, still more preferably 1.5 mg / kg or more, still more preferably 2 mg / kg or more, and 5% by mass or less, preferably 3% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, still more preferably 0.7% by mass or less, still more preferably 0.5% by mass or less, still more preferably 0.3% by mass or less, The content of component (b) in the fiber treatment composition is 0.1 mg / kg or more, preferably 0.5 mg / kg or more, more preferably 1 mg / kg or more, even more preferably 3 mg / kg or more, still more preferably 5 mg / kg or more, still more preferably 10 mg / kg or more, still more preferably 2 mg / kg or more, and is 50 mass% or less, preferably 40 mass% or less, more preferably 35 mass% or less, even more preferably 30 mass% or less, still more preferably 20 mass% or less, still more preferably 15 mass% or less, and still more preferably 10 mass% or less. <24> ~ <26> The fiber treatment composition according to any one of the preceding claims.

[0140] <29> <28> When the fiber treatment composition described in the above item (1) contains water and is a fiber treatment composition (1) to be used by contacting fibers with the fiber treatment composition (1) after diluting with a solvent, preferably water, the content of component (a) or component (a') in the fiber treatment composition (1) is 0.03% by mass or more, preferably 0.05% by mass or more, more preferably 0.07% by mass or more, even more preferably 0.08% by mass or more, still more preferably 0.1% by mass or more, and 5% by mass or less, preferably 3% by mass or less, more preferably 2% by mass or less, even more preferably 1.5% by mass or less, still more preferably 1% by mass or less, The content of component (b) in the fiber treatment composition (1) is 0.1% by mass or more, preferably 0.2% by mass or more, more preferably 0.3% by mass or more, even more preferably 0.4% by mass or more, still more preferably 0.5% by mass or more, and 50% by mass or less, preferably 40% by mass or less, more preferably 35% by mass or less, even more preferably 30% by mass or less. <28> The fiber treatment composition according to claim 1.

[0141] <30> <28> When the fiber treatment composition described in (2) contains a solvent, preferably water, and is a fiber treatment composition (2) to be used by contacting fibers as it is, the content of the polymer for reducing MPF generation for fibers or the polymer for fiber treatment in the fiber treatment composition (2) is 0.1 mg / kg or more, preferably 0.3 mg / kg or more, more preferably 0.5 mg / kg or more, even more preferably 0.7 mg / kg or more, still more preferably 1 mg / kg or more, still more preferably 1.5 mg / kg or more, still more preferably 2 mg / kg or more, and 300 mg / kg or less, preferably 200 mg / kg or less, more preferably 100 mg / kg or less, still more preferably 70 mg / kg or less, still more preferably 50 mg / kg or less, still more preferably 30 mg / kg or less, still more preferably 20 mg / kg or less, The content of the (b) component is 0.1 mg / kg or more, preferably 0.3 mg / kg or more, more preferably 0.5 mg / kg or more, even more preferably 0.8 mg / kg or more, still more preferably 1 mg / kg or more, even more preferably 2 mg / kg or more, even more preferably 3 mg / kg or more, and 5,000 mg / kg or less, preferably 2,000 mg / kg or less, more preferably 1,000 mg / kg or less, even more preferably 750 mg / kg or less, still more preferably 500 mg / kg or less, still more preferably 400 mg / kg or less, and still more preferably 300 mg / kg or less; <28> The fiber treatment composition according to claim 1.

[0142] <31> the mass ratio of the content of the component (a) or the content of the component (a') to the content of the component (b), [(a) or (a') / (b)], is 0.01 or more, preferably 0.02 or more, more preferably 0.05 or more, even more preferably 0.1 or more, and is 5 or less, preferably 2 or less, more preferably 1 or less, and even more preferably 0.5 or less; <24> ~ <30> The fiber treatment composition according to any one of the preceding claims.

[0143] <32> For fibers, <1> ~ <31> A method for treating fibers, comprising a step of contacting a fiber with the fiber treatment composition according to any one of claims 1 to 4.

[0144] <33> The fibers are fibers containing one or more synthetic fibers, <32> The method for treating fibers according to claim 1.

[0145] <34> In the method for treating fibers, the method for contacting the fiber treatment composition with the fiber is a method of spraying the treatment liquid onto the fiber, a method of applying the treatment liquid onto the fiber, or a method of immersing the fiber in the treatment liquid. <32> or <33> The method for treating fibers according to any one of the preceding claims.

[0146] <35> The method for contacting the fiber with the fiber treatment composition is a method in which the fiber is immersed in the fiber treatment composition (2) and treated by a rotary treatment method. <32> ~ <33> The method for treating fibers according to any one of the preceding claims.

[0147] <36> The liquor ratio, which is the ratio of the mass (kg) of the fiber to the amount (L) of the fiber treatment composition (2), [amount (L) of the fiber treatment composition (2) / mass (kg) of the fiber], is 2 or more, preferably 3 or more, more preferably 4 or more, even more preferably 5 or more, still more preferably 6 or more, still more preferably 7 or more, still more preferably 10 or more, still more preferably 12 or more, and is 200 or less, preferably 100 or less, more preferably 80 or less, even more preferably 50 or less, still more preferably 30 or less, still more preferably 25 or less, more preferably 20 or less, and still more preferably 18 or less. <32> ~ <35> The method for treating fibers according to any one of the preceding claims.

[0148] <37> In the fiber treatment method, the fiber treatment time is 10 seconds or more, preferably 20 seconds or more, more preferably 30 seconds or more, even more preferably 1 minute or more, still more preferably 2 minutes or more, still more preferably 3 minutes or more, and 5 hours or less, preferably 3 hours or less, still more preferably 1 hour or less, still more preferably 50 minutes or less, still more preferably 30 minutes or less, still more preferably 15 minutes or less. <32> ~ <36> The method for treating fibers according to any one of the preceding claims.

[0149] <38> <32> ~ <37> A method for producing fibers obtained by the fiber treatment method according to any one of the above items.

[0150] <39> Use of a fiber treatment composition comprising the following component (a) and the following component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers: Component (a): A polymer containing a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R 3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. (b) Component: Anionic surfactant.

[0151] <40> Use of a fiber treatment composition comprising the following component (a') or the following component (b) for reducing the amount of microplastic fibers emitted from fibers, including synthetic fibers: Component (a'): A polymer for fiber treatment comprising a structural unit (a1) represented by the following general formula (1), a structural unit (a2) represented by the following general formula (2), and a structural unit (a4) represented by the following general formula (4): [ka] (In the formula, R 1 represents a hydrogen atom or a methyl group. 2 , R3 and R 4 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. [ka] (In the formula, R 5 and R 7 R each independently represents a hydrogen atom or a methyl group. 6 and R 8 each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group) carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl) methyl group, provided that R 6 or R 8 is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having 1 to 8 carbon atoms substituted with at least one hydroxy group. [ka] (In the formula, R 9 and R 11 R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. 10 and R 12 represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group, provided that R 10 or R 12 is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. (b) Component: Anionic surfactant. [Example]

[0152] <Polymer for reducing MPF generation or polymer for fiber treatment> The following polymers were used as component (a). Polymers (a-1) to (a-11) are copolymers composed of structural units of the following general formula (6). w1, x1, x2, y1, and y2 at the lower right of [] indicate the content ratio (mole part) of each structural unit. w1, x1, x2, y1, and y2, and the weight average molecular weight (Mw) are shown in Table 1. In Table 1, compounds in which y1 or y2 is not 0 can be read as component (a'). That is, polymers (a-5) to (a-8), (a-10), (a-11), (a-13) to (a-20) as component (a) can be read as polymers (a'-5) to (a'-8), (a'-10), (a'-11), (a'-13) to (a'-20) as component (a'), respectively. [Chemical formula] [Table 1]

[0153] Polymer (a-12): Polymer (a-12) is a copolymer in which x1, y1, and y2 are each 0, w1 and x2 each exceed 0, and the weight average molecular weight is about 800,000 in the above general formula (6).

[0154] The weight average molecular weight of each polymer was calculated by polyethylene glycol conversion using GPC described in

[0042] .

[0155] [Production method of polymer (a-1)] In a 300 mL four-neck flask equipped with a stirrer, a thermometer, and a cooling tube, 176.85 mL of ion-exchanged water, 16.99 g of methacrylic acid (2-hydroxyethyl) (HEMA, manufactured by Tokyo Chemical Industry Co., Ltd.), and 3.77 g (active ingredient: 3.01 g) of methacrylic acid (2-aminoethyl) chloride salt (TMAEMA, manufactured by Tokyo Chemical Industry Co., Ltd.) were charged. After nitrogen substitution, the mixture was stirred at 100 rpm for 15 minutes to dissolve uniformly. Then, it was heated to 55 °C, and a solution prepared by dissolving 0.39 g of V-50 (polymerization initiator, 2,2'-azobis(2-amidinopropane)·2 hydrochloride, manufactured by Fujifilm Wako Pure Chemical Corporation) in 2 g of ion-exchanged water was added, and polymerization was carried out for 3.5 hours. Then, the temperature was raised to 80 °C, and aging was carried out for 2 hours to obtain polymer (a-1).

[0156] <Anionic surfactant> The following anionic surfactants were used as component (b). (b-1): Sodium internal olefin sulfonate with 16 carbon atoms (b-2): Sodium polyoxyalkylene lauryl ether sulfate (Sulfate salt obtained by adding an average of 2 mol of oxypropylene groups to lauryl alcohol and then adding an average of 2 mol of oxyethylene groups) (b-3): Sodium alkylbenzene sulfonate (Composition of alkyl part: C10 / C11 / C12 / C13 = 11 / 29 / 34 / 26 (mass ratio)) (b-4): Sodium internal olefin sulfonate with 18 carbon atoms (b-5): Sodium polyoxyethylene alkyl ether sulfate (Alkyl group: octyl group / decyl group / dodecyl group = 5 / 5 / 90 (mass ratio), average number of added moles of oxypropylene group is 0.6 mol) (b-6): Sodium polyoxyethylene alkyl ether sulfate (Alkyl group: lauryl group / myristyl group = 7 / 3 (mass ratio), average number of added moles of oxyethylene group is 2)

[0157] <Evaluation method for MPF reduction ability> Next, the evaluation method for MPF reduction ability will be described. Using component (a), component (b), and tap water (Wakayama City water, 25 °C), the fiber treatment compositions (also referred to as fiber treatment composition (2) or treatment liquid) described in Tables 2, 3, and 4 were prepared. Into a standard bottle (PS-NO.11 manufactured by AS ONE Corporation), 25 mL of the fiber treatment composition in total was put, and two pieces of 6 cm × 6 cm polyester cloth (cut from MITSUWA TIGER semi-fitted round neck SS underwear) were placed therein. Then, the standard bottle was capped, and the standard bottle was placed horizontally in a small constant temperature shaking incubator (manufactured by TAITEC Co., Ltd., model number: BR-23FP), and rotated and shaken at 25 °C and 150 rpm for 10 min, which was used as the washing step. Subsequently, only the cloth was taken out and transferred to a standard bottle filled with 25 mL of Wakayama City water, and the same shaking operation was performed for 3 minutes as the rinsing step. After each step, only the cloth was removed from the standard bottle, and the remaining washing solution was collected and the MPF discharge amount was quantified by the following MPF counting method. The bath ratio was 25. Also, when changing the bath ratio in the examples, the amount of the fiber treatment composition was changed to adjust the bath ratio. The immersion treatment in Tables 2 and 3 corresponds to a rotary treatment method. Also, using component (a), component (b), and tap water (Wakayama City water, 25 °C), the fiber treatment composition (1) described in Table 5 was prepared. In Examples 56 to 59, when preparing 25 mL in total of the fiber treatment composition (2) in a standard bottle (PS-NO.11 manufactured by AS ONE Corporation), the dilution ratio was changed using the fiber product treatment composition (1) and tap water (Wakayama City water, 25 °C) so as to have the same concentration as the same fiber product treatment composition (2) as in Example 39. Similarly, in Examples 60 to 63, the dilution ratio was changed using the fiber product treatment composition (1) and tap water (Wakayama City water, 25 °C) so as to have the same concentration as the same fiber product treatment composition (2) as in Examples 48 to 51. The MPF reduction ability of Examples 56 to 63 was evaluated.

[0158] <Quantification of MPF Discharge Amount by MPF Counting Method> (Preparation of Measurement Sample) The entire amount of wash water obtained in the washing and rinsing processes was poured into a petri dish (As One Corporation Ascept Petri dish (electron beam sterilized), diameter 90 mm, height 20 mm) with the lid removed. The walls of the standard bottle were then rinsed with a small amount of tap water, and the rinse water was then added to the petri dish. Visible coarse fibers and impurities that were clearly not MPFs were manually removed using tweezers. The mixture was then lightly stirred with a dropper or similar to ensure uniformity and prevent overlapping of MPFs. The mixture was then left to stand for approximately 1 minute until the MPFs sank to the bottom of the petri dish, and used as a measurement sample. (scan) The measurement sample was scanned using a home scanner (Seiko Epson Corporation GT-X830). Scanning conditions: "Professional mode", image type: 48-bit color, resolution: 600 dpi, unsharp mask effect: "strong" (Counting by image processing) The image file created in (Scan) was read into Image J, and the number of MPFs was counted after the following image processing steps. Evaluation was performed without adding a polymer, and the calculated MPF emission rate was set to 100%, and the percentage (%) of MPF emission rate for each MPF reducer composition was calculated and used as the MPF emission rate (%). The smaller the MPF emission rate, the higher the MPF reduction ability of the MPF reducer. The following image processing steps were performed automatically by a computer based on pre-stored settings. 1.Image>Type>8Bit 2.Process>Subtract Background...>Roolingball radius:50pixels(Check Light background) 3. Select the area you want to analyze inside the dish in a circular shape and set the threshold to 245 in Image > Adjust > Threshold. 4. Analyze > Analyze Particles, set the size to "3-Infenity" and output the summary. 5.Get the count value of the output Summary The results are shown in Tables 2 to 5.

[0159] Table 2

[0160] Table 3

[0161] Table 4

[0162] Table 5

Claims

1. A polymer for reducing the generation of microplastic fibers for textiles, comprising a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). 【Chemistry 1】 (In the formula, R １ represents a hydrogen atom or a methyl group. ２ , R ３ and R ４ each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. 【Chemistry 2】 (In the formula, R ５ and R ７ R each independently represents a hydrogen atom or a methyl group. ６ and R ８ each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group)carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group, provided that R ６ or R ８ is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having from 1 to 8 carbon atoms and substituted with at least one hydroxy group.

2. The polymer for reducing the generation of microplastic fibers for fibers, as described in claim 1, wherein the component (a), which is the polymer for reducing the generation of microplastic fibers for fibers, further contains a structural unit (a4) of the following general formula (4): 【Transformation 3】 (In the formula, R ９ and R １１ R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. １０ and R １２ represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. １０ or R １２ is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino)carbonyl group having 1 to 4 carbon atoms substituted with at least one sulfo group.

3. The polymer for reducing the generation of microplastic fibers for textiles according to claim 1 or 2, wherein the structural unit of general formula (2) is introduced into the polymer by a polymerization reaction using one or more monomers selected from 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and N-vinylpyrrolidone.

4. The polymer for reducing the generation of microplastic fibers for textiles according to claim 2, wherein the structural unit (a4) of general formula (4) is introduced into the polymer by a polymerization reaction using one or more monomers selected from acrylic acid, methacrylic acid, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid, and styrenesulfonic acid, or salts thereof.

5. In general formula (1), R １ is a methyl group, and R ２ , R ３ and R ４ are each independently an alkyl group having 1 to 4 carbon atoms, X is —O— or —NH—, m is an integer of 2 or 3, and Z － The polymer for reducing the generation of microplastic fibers for textiles according to claim 1 or 2, wherein is one or more anions selected from alkyl sulfate ions and halide ions having 1 to 3 carbon atoms.

6. The polymer for reducing the generation of microplastic fibers for textiles according to claim 1, wherein the weight average molecular weight of the polymer is 50,000 or more and 3,000,000 or less.

7. A polymer for reducing the generation of microplastic fibers for textiles according to claim 2, wherein the ratio of the content (p2) of the structural unit (a1) of general formula (1) to the content (r2) of the structural unit (a4) of general formula (4), p2 / r2, is 0.1 or more and 1 or less.

8. A polymer for fiber treatment comprising a structural unit (a1) represented by the following general formula (1), a structural unit (a2) represented by the following general formula (2), and a structural unit (a4) represented by the following general formula (4): 【Chemistry 4】 (In the formula, R １ represents a hydrogen atom or a methyl group. ２ , R ３ and R ４ each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. 【Transformation 5】 (In the formula, R ５ and R ７ R each independently represents a hydrogen atom or a methyl group. ６ and R ８ each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group)carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group, provided that R ６ or R ８ is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having from 1 to 8 carbon atoms and substituted with at least one hydroxy group. 【Transformation 6】 (In the formula, R ９ and R １１ R each independently represents a hydrogen atom, a methyl group, a carboxy group, or a salt thereof. １０ and R １２ represents a hydrogen atom, a methyl group, a carboxy group or a salt thereof, a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino having 1 to 4 carbon atoms substituted with at least one sulfo group)carbonyl group. １０ or R １２ is a hydrogen atom, a methyl group, a carboxy group, or a salt thereof, and the other is a carboxy group or a salt thereof, a sulfophenyl group or a salt thereof, or an (alkylamino)carbonyl group having 1 to 4 carbon atoms substituted with at least one sulfo group.

9. A fiber treatment composition comprising, as component (a), the polymer for reducing the generation of microplastic fibers for fibers described in claim 1, or as component (a'), the polymer for fiber treatment described in claim 8.

10. Furthermore Component (b): Anionic surfactant The fiber treatment composition according to claim 9, comprising:

11. 11. The fiber treatment composition according to claim 10, wherein the component (b) is one or more anionic surfactants selected from alkylarylsulfonic acid surfactants, sulfate ester surfactants, alkanesulfonic acid surfactants, olefinsulfonic acid surfactants, alkyl sulfosuccinate ester surfactants, and sulfofatty acid ester surfactants.

12. The fiber treatment composition according to claim 10, wherein the content of component (b) is 1% by mass or more and 70% by mass or less.

13. The fiber treatment composition according to claim 10, wherein the mass ratio of the content of the component (a) or the content of the component (a') to the content of the component (b), [(a) or (a') / (b)], is 0.01 or more and 5 or less.

14. A method for treating fibers, comprising the step of contacting fibers with the fiber treatment composition according to claim 9 or 10.

15. A method for producing fibers obtained by the fiber treatment method according to claim 14.

16. Use of a fiber treatment composition comprising the following component (a) and the following component (b) for reducing the amount of microplastic fibers emitted from fibers including synthetic fibers: Component (a): A polymer containing a structural unit (a1) represented by the following general formula (1) and a structural unit (a2) represented by the following general formula (2). 【Transformation 7】 (In the formula, R １ represents a hydrogen atom or a methyl group. ２ , R ３ and R ４ each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; X represents -O- or -NH-; and m represents an integer of 1 to 4. 【Transformation 8】 (In the formula, R ５ and R ７ R each independently represents a hydrogen atom or a methyl group. ６ and R ８ each independently represents a hydrogen atom or a methyl group, or a (alkoxy having 1 to 8 carbon atoms substituted with at least one hydroxy group)carbonyl group or (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group, provided that R ６ or R ８ is a hydrogen atom or a methyl group, and the other is an (alkoxy)carbonyl group or an (azacycloaliphatic or aromatic hydrocarbon-N-yl)methyl group having from 1 to 8 carbon atoms and substituted with at least one hydroxy group. Component (b): anionic surfactant.

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