Polyester synthetic fiber treatment agent, composition containing polyester synthetic fiber treatment agent, first polyester synthetic fiber treatment agent, composition containing first polyester synthetic fiber treatment agent, second polyester synthetic fiber treatment agent, composition containing second polyester synthetic fiber treatment agent, dilution of polyester synthetic fiber treatment agent, polyester synthetic fiber treatment method, and polyester synthetic fiber

Abstract

The present invention provides a treatment agent for polyester synthetic fibers and the like, which can improve emulsion stability when the treatment agent for synthetic fibers is made into an aqueous dilution, can reduce the adhesion of the surface of the fiber to which the treatment agent for synthetic fibers is applied, and can suppress a decrease in fiber strength. The treatment agent for polyester synthetic fibers of the present invention contains 5% by mass or more of a (poly)oxyalkylene derivative (A), 1% by mass or more of an organic acid compound (B) described below, and 5% by mass or more of an organic phosphate compound (C) described below. The pH of a 5% by mass aqueous dilution of the treatment agent for polyester synthetic fibers (solvent-free) at 25°C is 5.5 or more and 8.5 or less. The organic acid compound (B) is at least one selected from the group consisting of an organic acid, an organic acid salt, and an organic acid anhydride. The organic phosphate compound (C) is at least one selected from the group consisting of an organic phosphate having a hydrocarbon group with 16 or more and 20 or less carbon atoms in the molecule, and a salt thereof.

Description

Technical Field

[0001] The present invention relates to a treatment agent for polyester synthetic fibers, a composition containing the treatment agent for polyester synthetic fibers, a first treatment agent for polyester synthetic fibers, a composition containing the first treatment agent for polyester synthetic fibers, a second treatment agent for polyester synthetic fibers, a composition containing the second treatment agent for polyester synthetic fibers, a diluent for the treatment agent for polyester synthetic fibers, a method for treating polyester synthetic fibers, and polyester synthetic fibers. Background Technology

[0002] For example, in the spinning and stretching steps and finishing steps of synthetic fibers, from the perspective of reducing friction, antistatic properties, and bundle properties of synthetic fibers, sometimes a synthetic fiber treatment agent is applied to the surface of the fiber.

[0003] Currently, patent documents 1 to 5 disclose treatment agents for synthetic fibers. Patent document 1 discloses a treatment agent for polyester synthetic fibers, which contains, in a predetermined proportion, an alkali metal salt of an alkyl phosphate having a predetermined alkyl group, a predetermined surfactant, and a predetermined metal phosphate salt, wherein the acid value of the alkali metal salt of the alkyl phosphate is 0.1 to 90 KOH mg / g. Patent document 2 discloses a treatment agent for polyester synthetic fibers, which contains, in a predetermined proportion, a predetermined alkyl phosphate, a predetermined surfactant, and a monoaliphatic alcohol having a predetermined alkyl group. Patent document 3 discloses a fiber treatment agent for spinning manufacturing, containing component A, which is composed of polyvinyl alcohol or its derivatives, as an essential component, and component B, which is composed of a potassium salt of an alkyl phosphate having a predetermined alkyl group or a potassium salt of a polyoxyalkylene alkyl phosphate, wherein component A and component B are mixed in a predetermined proportion. Patent Document 4 discloses a treatment agent for polyolefin synthetic fibers, which contains a predetermined organic acid, two types of alkyl phosphate salts, and polyoxyalkylene derivatives in a predetermined proportion, wherein the pH of the aqueous solution is 3 or higher and less than 7. Patent Document 5 discloses a treatment agent for polyolefin synthetic fibers, which contains fumaric acid, a predetermined nonionic surfactant, a dialkyl sulfosuccinate with 8 to 16 carbon atoms in a predetermined proportion, and a polyglycerol fatty acid ester.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 5796922

[0007] Patent Document 2: Japanese Patent No. 5796923

[0008] Patent Document 3: Japanese Patent No. 5651033

[0009] Patent Document 4: Japanese Patent No. 6057489

[0010] Patent Document 5: Japanese Patent Application Publication No. 2018-31090 Summary of the Invention

[0011] The problem that the invention aims to solve

[0012] However, in conventional synthetic fiber treatment agents, emulsification stability sometimes decreases when the agent is diluted with water, resulting in the formation of precipitates. Additionally, the adhesiveness of the fiber surface treated with the agent sometimes increases, leading to poor spinning. Furthermore, the strength imparted to the fiber by the agent sometimes decreases, resulting in poor process flow.

[0013] Methods for solving problems

[0014] In order to solve the above-mentioned problems, the inventors conducted research and found that the treatment agent for polyester synthetic fibers contains a (poly)oxyalkylene derivative (A), a predetermined organic acid compound (B), and a predetermined organic phosphate compound (C), and the pH setting is particularly effective.

[0015] The various methods used to solve the above-mentioned problems are recorded.

[0016] Method 1 is a treatment agent for polyester synthetic fibers, containing 5% by mass or more of a (poly)oxyalkylene derivative (A), 1% by mass or more of the following organic acid compound (B), and 5% by mass or more of the following organophosphate compound (C), wherein the key feature is that a 5% by mass aqueous dilution of the above-mentioned polyester synthetic fiber treatment agent (without solvent) has a pH of 5.5 or more and 8.5 or less at 25°C; the organic acid compound (B) is selected from at least one of organic acids, organic acid salts, and organic acid anhydrides; the organophosphate compound (C) is selected from at least one of organophosphates having a hydrocarbon group having 16 or more and 20 or less carbon atoms in the molecule, and salts thereof.

[0017] Method 2 is a treatment agent for polyester synthetic fibers as described in Method 1, wherein the organic acid compound (B) is at least one selected from a mono- to pentacarboxylic acid having 0 to 9 carbon atoms other than those derived from the carboxyl group, a salt of a mono- to pentacarboxylic acid having 0 to 9 carbon atoms other than those derived from the carboxyl group, and a di- to pentacarboxylic anhydride having 0 to 9 carbon atoms other than those derived from the carboxyl group.

[0018] Method 3 is a treatment agent for polyester synthetic fibers as described in Method 1 or 2, wherein the (poly)oxyalkylene derivative (A) comprises at least one selected from polyoxyalkylene alkylamines and polyoxyalkylene alkenylamines.

[0019] Method 4 is a treatment agent for polyester synthetic fibers as described in any of Methods 1 to 3, wherein when the total content ratio of the above-mentioned (poly)oxyalkylene derivative (A), the above-mentioned organic acid compound (B), and the above-mentioned organophosphate compound (C) is set to 100 parts by mass, the total content ratio of the above-mentioned (poly)oxyalkylene derivative (A) and the above-mentioned organic acid compound (B) is 20 parts by mass or more and 80 parts by mass or less, and the content ratio of the above-mentioned organophosphate compound (C) is 20 parts by mass or more and 80 parts by mass or less.

[0020] Method 5 is a treatment agent for polyester synthetic fibers as described in any of Methods 1 to 4, wherein it is configured to include, in a group, a first treatment agent for polyester synthetic fibers containing the above-mentioned (poly)oxyalkylene derivative (A), and a second treatment agent for polyester synthetic fibers containing the above-mentioned organophosphate compound (C); any one or both of the above-mentioned first treatment agent for polyester synthetic fibers and the above-mentioned second treatment agent for polyester synthetic fibers contain the above-mentioned organic acid compound (B).

[0021] Method 6 is a treatment agent for polyester synthetic fibers as described in any of Methods 1 to 5, wherein the polyester synthetic fibers are polyester staple fibers.

[0022] Method 7 is a treatment agent for polyester synthetic fibers as described in any of Methods 1 to 6, wherein the polyester synthetic fibers are for spinning.

[0023] Method 8 is a composition containing a treatment agent for polyester synthetic fibers, characterized in that it comprises the treatment agent for polyester synthetic fibers described in any one of methods 1 to 7 and the solvent (S) described below; and the solvent (S) has a boiling point of 105°C or less at atmospheric pressure.

[0024] Method 9 is a first treatment agent for polyester synthetic fibers, containing a (poly)oxyalkylene derivative (A), and used in combination with a second treatment agent for polyester synthetic fibers or a composition containing the second treatment agent for polyester synthetic fibers; the second treatment agent for polyester synthetic fibers contains the following organophosphate compound (C); the composition containing the second treatment agent for polyester synthetic fibers contains the second treatment agent for polyester synthetic fibers and the following solvent (S); the key point is that: either or both of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contain the following organic acid compound (B); when the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers (excluding...) When the solvent is set as a 5% by mass water dilution, the pH at 25°C is 5.5 or higher and 8.5 or lower; the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers (excluding solvent) contains 5% or more of the above-mentioned (poly)oxyalkylene derivative (A), 1% or more of the above-mentioned organic acid compound (B), and 5% or more of the above-mentioned organic phosphate compound (C); the organic acid compound (B) is selected from at least one of organic acids, organic acid salts, and organic acid anhydrides; the organic phosphate compound (C) is selected from at least one of organic phosphates having a hydrocarbon group having 16 or more and 20 or fewer carbon atoms in the molecule, and their salts; the solvent (S) has a boiling point of 105°C or lower at atmospheric pressure.

[0025] Method 10 is a composition containing a first treatment agent for polyester synthetic fibers, characterized in that it contains the first treatment agent for polyester synthetic fibers described in Method 9 and the solvent (S) described below; and the solvent (S) has a boiling point of 105°C or less at atmospheric pressure.

[0026] Method 11 is a second treatment agent for polyester synthetic fibers, containing the following organophosphate compound (C), and used in combination with a first treatment agent for polyester synthetic fibers or a composition containing the first treatment agent for polyester synthetic fibers; the first treatment agent for polyester synthetic fibers contains a (poly)oxyalkylene derivative (A); the composition containing the first treatment agent for polyester synthetic fibers contains the first treatment agent for polyester synthetic fibers and the following solvent (S); the key point is that: any one or both of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers contain the following organic acid compound (B); when the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers (excluding...) When the solvent is set as a 5% by mass water dilution, the pH at 25°C is 5.5 or higher and 8.5 or lower; the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers (excluding solvent) contains 5% or more of the above-mentioned (poly)oxyalkylene derivative (A), 1% or more of the above-mentioned organic acid compound (B), and 5% or more of the above-mentioned organic phosphate compound (C); the organic acid compound (B) is selected from at least one of organic acids, organic acid salts, and organic acid anhydrides; the organic phosphate compound (C) is selected from at least one of organic phosphates having a hydrocarbon group having 16 or more and 20 or fewer carbon atoms in the molecule, and their salts; the solvent (S) has a boiling point of 105°C or lower at atmospheric pressure.

[0027] Method 12 is a composition containing a second treatment agent for polyester synthetic fibers, characterized in that it contains the second treatment agent for polyester synthetic fibers described in Method 11 and the solvent (S) described below; and the solvent (S) has a boiling point of 105°C or less at atmospheric pressure.

[0028] Method 13 is a diluted solution of a treatment agent for polyester synthetic fibers, characterized in that it contains the treatment agent for polyester synthetic fibers described in any one of Methods 1 to 7, wherein the concentration of the treatment agent for polyester synthetic fibers is 0.1% by mass or more and 10% by mass or less.

[0029] Method 14 is a method for treating polyester synthetic fibers, the key point of which is to apply a diluted solution of a polyester synthetic fiber treatment agent to the polyester synthetic fibers; the diluted solution of the polyester synthetic fiber treatment agent is obtained by adding the polyester synthetic fiber treatment agent of any one of Methods 1 to 7 to water.

[0030] Method 15 is a method for treating polyester synthetic fibers, the key point of which is to apply a diluted solution of a polyester synthetic fiber treatment agent to the polyester synthetic fibers; the diluted solution of the polyester synthetic fiber treatment agent is obtained by adding the composition containing the polyester synthetic fiber treatment agent described in Method 8 to water.

[0031] Method 16 is a method for treating polyester synthetic fibers, the key point of which is to apply a diluted solution of a polyester synthetic fiber treatment agent to the polyester synthetic fibers; the diluted solution of the polyester synthetic fiber treatment agent is obtained by adding the first polyester synthetic fiber treatment agent of Method 9, or the composition containing the first polyester synthetic fiber treatment agent of Method 10, the second polyester synthetic fiber treatment agent of Method 11, or the composition containing the second polyester synthetic fiber treatment agent of Method 12 to water.

[0032] Method 17 is a polyester synthetic fiber, the key feature of which is that it is coated with any one of the polyester synthetic fiber treatment agents of methods 1 to 7.

[0033] Invention Effects

[0034] According to the present invention, the emulsion stability when the synthetic fiber treatment agent is made into an aqueous dilution can be improved. Furthermore, the adhesiveness of the fiber surface treated with the synthetic fiber treatment agent can be reduced, and the reduction in fiber strength can be suppressed. Detailed Implementation

[0035] <First Embodiment>

[0036] The following describes a first embodiment of the treatment agent for polyester synthetic fibers (hereinafter referred to as the treatment agent) of the present invention. The treatment agent of this embodiment contains a (poly)oxyalkylene derivative (A), the following organic acid compound (B), and the following organic phosphate ester compound (C), wherein a 5% by mass aqueous dilution of the treatment agent has a pH of 5.5 or higher and 8.5 or lower at 25°C.

[0037] ((poly)oxyalkylene derivative (A))

[0038] The (poly)oxyalkylene derivative (A) used in the treatment agent of this embodiment is used as a surfactant to improve the stability of the treatment agent, thereby improving the various functions of the treatment agent.

[0039] Examples of (poly)oxyalkylene derivatives (A) include compounds having a (poly)oxyalkylene structure formed by adding an epoxide to an alcohol or carboxylic acid; ether / ester compounds having a (poly)oxyalkylene structure formed by adding an epoxide to an ester compound formed by adding an epoxide to a carboxylic acid and a polyol; compounds having a (poly)oxyalkylene structure formed by adding an epoxide to an aliphatic amine compound; compounds having a (poly)oxyalkylene structure formed by adding an epoxide to a fatty acid amine; and block copolymers having a polyoxyethylene chain and a polyoxypropylene chain.

[0040] Among these, polyoxyalkylene alkyl ethers, polyoxyalkylene alkenyl ethers, polyoxyalkylene alkyl esters, polyoxyalkylene alkenyl esters, polyoxyalkylene alkylphenyl ethers, polyoxyalkylene polyol fatty acid esters, polyoxyalkylene alkylamines, and polyoxyalkylene alkenylamines are preferred. Furthermore, from the viewpoint of improving the emulsification stability when the treatment agent is prepared as an aqueous dilution, polyoxyalkylene alkylamines and polyoxyalkylene alkenylamines are even more preferred.

[0041] Specific examples of alcohols used as raw materials for (poly)oxyalkylene derivatives (A) include, for example: (1) methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosane, dodecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, triadecanol, etc., straight-chain alkanols; (2) isopropanol, isobutanol, isohexanol, 2-ethylhexanol, isononol, isodecanol, isodecanol, isodecanol, isodecanol, isodecanol, isodecanol, etc. Branched alkanols such as isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, etc.; (3) Straight-chain enols such as tetradecenol, hexadecenol, heptadecenol, octadecenol, nonadecanol, etc.; (4) Branched enols such as isopentadecanol, isopentadecanol, etc.; (5) Cyclic alkanols such as cyclopentanol, cyclohexanol, etc.; (6) Aromatic alcohols such as phenol, nonanol, benzyl alcohol, monostyrene, stilbene, tristyrene, etc.

[0042] Specific examples of carboxylic acids used as raw materials for (poly)oxyalkylene derivatives (A) include: (1) straight-chain alkyl carboxylic acids such as octanoic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, eicosanoic acid, dodecanoic acid, and docosanoic acid; (2) branched-chain alkyl carboxylic acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, and isooctadecanoic acid; (3) straight-chain alkenyl carboxylic acids such as octadecenoic acid, octadecadienoic acid, and octadectrienoic acid; (4) aromatic carboxylic acids such as benzoic acid; (5) hydroxycarboxylic acids such as ricinoleic acid; and (6) fatty acids derived from nature such as castor oil fatty acids, sesame oil fatty acids, rosin oil fatty acids, soybean oil fatty acids, rapeseed oil fatty acids, palm oil fatty acids, palm kernel fatty acids, and coconut oil fatty acids.

[0043] The epoxide used as a raw material for forming the (poly)oxyalkylene structure in the (poly)oxyalkylene derivative (A) is preferably an epoxide with 2 or more and 4 or fewer carbon atoms. Specific examples of epoxides include ethylene oxide, propylene oxide, and butane oxide. The molar number of epoxides added can be appropriately set, preferably 0.1 moles or more and 250 moles or less, more preferably 1 mole or more and 200 moles or less, and most preferably 2 moles or more and 150 moles or less. It can also be any combination of the above upper and lower limits. Herein, the molar number of epoxides added represents the number of moles of epoxide relative to 1 mole of the target compound in the filling raw material. One type of epoxide can be used alone, or two or more epoxides can be used in combination appropriately. When two or more types of epoxides are used, the addition method can be any one of block addition, random addition, and a combination of block addition and random addition, without particular limitation.

[0044] Specific examples of polyols used as raw materials for (poly)oxyalkylene derivatives (A) include ethylene glycol, propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,2-propanediol, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 2-methyl-2,4-pentanediol, 2,3-dimethyl-2,3-butanediol, glycerol, 2-methyl-2-hydroxymethyl-1,3-propanediol, trimethylolpropane, dehydrosorbitol, neopentyl tertrol, sorbitol, etc.

[0045] Specific examples of aliphatic amines used as raw materials for (poly)oxyalkylene derivatives (A) include methylamine, ethylamine, butylamine, octylamine, decylamine, laurylamine, octadecylamine, octadeceneamine, and coconutamine.

[0046] Specific examples of fatty acid amides used as raw materials for (poly)oxyalkylene derivatives (A) include octanoic acid amide, lauryl amide, palmitamide, stearamide, oleamide, eugenol amide, and styracin amide.

[0047] Block copolymers containing polyoxyethylene and polyoxypropylene chains are not particularly limited as long as they have polyoxypropylene chains with low hydrophilicity and polyoxyethylene chains with high hydrophilicity and surface-active properties. The number of polyoxyethylene and polyoxypropylene chains in the molecule is not particularly limited; for example, it can be a block copolymer composed of one polyoxypropylene chain and one polyoxyethylene chain, or a poloxamer-based surfactant composed of a polyoxypropylene chain and two polyoxyethylene chains sandwiching that polyoxypropylene chain. Furthermore, it can also be an ether compound formed by the addition of polyoxyethylene and polyoxypropylene chains to a polyol. The number of moles of ethylene oxide forming the polyoxyethylene chain is not particularly limited; for example, it can be more than 5 moles and less than 200 moles. The number of moles of propylene oxide forming the polyoxypropylene chain is not particularly limited; for example, it can be more than 5 moles and less than 100 moles.

[0048] Specific examples of (poly)oxyalkylene derivatives (A) include, for example, polyoxyethylene decylamine, polyoxyethylene dodecylamine, (polyoxyethylene)(polyoxypropylene) dodecylamine, polyoxyethylene octadecylamine, (polyoxyethylene)(polyoxypropylene) octadecylamine, polyoxyethylene decyl ether, (polyoxyethylene)(polyoxypropylene) decyl ether, polyoxyethylene dodecyl ether, (polyoxyethylene)(polyoxypropylene) C9-C11 alkyl ether, polyoxyethylene C12-C13 alkyl ether, (polyoxyethylene)(polyoxypropylene) C12-C13 alkyl ether, polyoxyethylene C12-C14 alkyl ether, (poly... (Polyoxyethylene) tridecyl ether, polyoxyethylene tridecyl ether, (polyoxyethylene) (polyoxypropylene) C11-C14 alkyl ether, polyoxyethylene C11-C14 alkyl ether, polyoxyethylene octadecyl ether, polyoxyethylene oil ether, polyoxyethylene tetradecyl ether, polyoxyethylene octadecyl ether, (polyoxyethylene) (polyoxypropylene) hardened castor oil, (polyoxyethylene) (polyoxypropylene) propylene glycol, (polyoxyethylene) (polyoxypropylene) butyl ether, polyoxyethylene lauryl ester, coconut fatty acid-polyoxyethylene, polyoxypropylene oil-based ester, polyoxyethylene nonylphenyl ether, etc.

[0049] These (poly)oxyalkylene derivatives (A) can be used alone or in combination of two or more (poly)oxyalkylene derivatives.

[0050] In the treatment agent, the lower limit of the content of (poly)oxyalkylene derivative (A) is preferably 5% by mass or more, and more preferably 10% by mass or more. When the content of (poly)oxyalkylene derivative (A) is 5% by mass or more, the emulsification stability when the treatment agent is prepared as an aqueous dilution can be improved. Furthermore, the upper limit of the content of (poly)oxyalkylene derivative (A) is preferably 90% by mass or less, and more preferably 85% by mass or less. When the content of (poly)oxyalkylene derivative (A) is 90% by mass or less, the adhesiveness of the fiber surface to which the treatment agent is applied can be reduced. Any combination of the above upper and lower limits is also possible.

[0051] (Organic acid compound (B))

[0052] The organic acid compound (B) used in the treatment agent of this embodiment can include organic acids, organic acid salts, and organic acid anhydrides. In particular, the organic acid compound (B) can suppress the reduction in the strength of the fibers to which the treatment agent has been applied.

[0053] Organic acids can be exemplified by compounds having a carboxyl group, alkyl phosphoric acid other than the components described below (C), alkyl sulfonic acid, alkyl sulfuric acid, etc.

[0054] Compounds containing a carboxyl group can be either monobasic or polycarboxylic acids. Furthermore, there is no particular limitation on the number of carbon atoms other than the carbon atom derived from the carboxyl group. Examples of compounds containing a carboxyl group include monobasic fatty acids, hydroxy fatty acids, polybasic acids, amino acids, and aminocarboxylic acids.

[0055] The fatty acids may be of known types, and may be saturated or unsaturated fatty acids. Furthermore, they may be linear compounds or compounds with branched structures.

[0056] Specific examples of saturated fatty acids include formic acid, acetic acid, propionic acid, butyric acid, gizzard acid, hexanoic acid (lanolinic acid), caprylic acid (2-ethylhexanoic acid), caprylic acid (lanolinic acid), nonanoic acid, decanoic acid (goat acid), dodecanoic acid (lauric acid), myristic acid (myristic acid), palmitic acid (palmitic acid), stearic acid (stearic acid), eicosanoic acid (arachidic acid), behenic acid (behenic acid), and tetracosanoic acid, etc.

[0057] Specific examples of unsaturated fatty acids include crotonic acid, myristoleic acid, palmitoleic acid, oleic acid, taurateuric acid, eicosenoic acid, linolenic acid, α-linolenic acid, γ-linolenic acid, and arachidic acid.

[0058] Specific examples of polycarboxylic acids include (1) dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, glutaric acid, fumaric acid, maleic acid, adipic acid, and sebacic acid; (2) tricarboxylic acids such as aconitic acid; (3) aromatic dicarboxylic acids such as benzoic acid, terephthalic acid, isophthalic acid, and 2,6-naphthalenedicarboxylic acid; (4) aromatic tricarboxylic acids such as benzoic acid; and (5) aromatic tetracarboxylic acids such as benzoic acid.

[0059] Specific examples of hydroxy fatty acids include citric acid, lactic acid, malic acid, tartaric acid, gluconic acid, glycolic acid, ricinoleic acid, etc.

[0060] Specific examples of amino acids include alanine, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, proline, glycine, serine, threonine, cysteine, tyrosine, asparagine, glutamine, lysine, arginine, histidine, aspartic acid, and glutamic acid.

[0061] Specific examples of aminocarboxylic acids include ethylenediaminetetraacetic acid (EDTA), hydroxyethylethylenediaminetriacetic acid (HDI), dihydroxyethylethylenediaminediacetic acid (DIDA), 1,3-propanediaminetetraacetic acid (PPTA), diethylenetriaminepentaacetic acid (DTA), triethylenetetraaminehexaacetic acid (TTHA), nitrilotriacetic acid (Nitrilotriacetic acid), hydroxyethyliminodiacetic acid (HDI), L-aspartic acid-N,N-diacetic acid (L-Aspartic-N,N-diacetic acid), and ethylenediaminedisuccinic acid (EDSA).

[0062] Specific examples of alkyl sulfonic acids include lauryl sulfonic acid (dodecyl sulfonic acid), myristyl sulfonic acid, cetyl sulfonic acid, oleyl sulfonic acid, stearyl sulfonic acid, tetradecyl sulfonic acid, dodecylbenzene sulfonic acid, secondary alkyl sulfonic acids (C13-15), etc.

[0063] Specific examples of alkyl sulfates include lauryl sulfate, oleyl sulfate, stearyl sulfate, etc.

[0064] Specific examples of alkyl phosphates include lauryl phosphate, octyl phosphate, etc.

[0065] When applying salts of organic acids, the salts can be listed as, for example, amine salts, metal salts, etc.

[0066] Examples of metal salts include alkali metal salts and alkaline earth metal salts. Specific examples of alkali metals that constitute alkali metal salts include sodium, potassium, and lithium. Alkaline earth metals that constitute alkaline earth metal salts include metals of Group 2 elements, such as calcium, magnesium, beryllium, strontium, and barium.

[0067] The amines that constitute amine salts can be any of the primary, secondary, and tertiary amines. Specific examples of amines that constitute amine salts include (1) aliphatic amines such as methylamine, dimethylamine, trimethylamine, ethylamine, diethylamine, triethylamine, N-N-diisopropylethylamine, butylamine, dibutylamine, 2-methylbutylamine, tributylamine, octylamine, and dimethyllauramine; (2) aromatic amines or heterocyclic amines such as aniline, N-methylbenzylamine, pyridine, morpholine, piperazine, and their derivatives; (3) alkyl alcohol amines such as monoethanolamine, N-methylethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine, triisopropanolamine, dibutylethanolamine, butyl diethanolamine, octyl diethanolamine, and lauryl diethanolamine; (4) aryl amines such as N-methylbenzylamine; (5) polyoxyethylene lauryl amino ethers such as polyoxyethylene stearyl amino ether; and (6) ammonia.

[0068] Specific examples of organic acid anhydrides include fumaric anhydride, maleic anhydride, acetic anhydride, propionic anhydride, succinic anhydride, phthalic anhydride, oxalic anhydride, benzoic anhydride, etc.

[0069] These organic acid compounds (B) can be used alone or in combination with two or more organic acid compounds.

[0070] Among these, from the viewpoint of improving the emulsification stability when the treatment agent is made into an aqueous dilution, it is preferable to be a mono- or pentacetic carboxylic acid with 0 to 9 carbon atoms other than the carbon atom derived from the carboxyl group, a salt of a mono- or pentacetic carboxylic acid with 0 to 9 carbon atoms other than the carbon atom derived from the carboxyl group, and a di- or pentacetic carboxylic anhydride with 0 to 9 carbon atoms other than the carbon atom derived from the carboxyl group.

[0071] In the treatment agent, the lower limit of the content of organic acid compound (B) is preferably 1% by mass or more, and more preferably 3% by mass or more. When the content of organic acid compound (B) is 1% by mass or more, the pH of the treatment agent can be adjusted to an appropriate range, and the reduction in fiber strength imparted by the treatment agent can be suppressed. Furthermore, the upper limit of the content of organic acid compound (B) is preferably 25% by mass or less, and more preferably 20% by mass or less. When the content of organic acid compound (B) is 25% by mass or less, the pH of the treatment agent can be adjusted to an appropriate range, and the emulsification stability when the treatment agent is prepared as an aqueous dilution can be improved. Any combination of the above upper and lower limits is also possible.

[0072] (Organophosphate compounds (C))

[0073] The organophosphate compound (C) used in the treatment agent of this embodiment can include organophosphates having a hydrocarbon group having 16 or more and 20 or fewer carbon atoms in the molecule, and their salts. By using the organophosphate compound (C), the adhesiveness of the fiber surface to which the treatment agent is applied can be reduced.

[0074] The hydrocarbon group can be either saturated or unsaturated. Furthermore, it can be a straight-chain hydrocarbon group or a branched hydrocarbon group. The unsaturated hydrocarbon group can be an alkenyl group with one unsaturated carbon double bond, or a dienyl or trienyl group with two or more double bonds. Additionally, it can be an alkynyl group with one unsaturated carbon triple bond, or a dienynyl group with two or more triple bonds.

[0075] Specific examples of saturated hydrocarbon groups include hexadecyl, heptadecanyl, octadecyl, nonadecanyl, eicosyl, isohexadecanyl, isohexadecanyl, isooctadecyl, isononadecanyl, isoeicosyl, etc.

[0076] Specific examples of unsaturated hydrocarbon groups with one double bond include hexadecenyl, heptadecanenyl, octadecenyl, nonadecanenyl, eicosenecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, isohexadecanenyl, and isohexadecanenyl.

[0077] There are no particular limitations on the phosphoric acid that constitutes organophosphate compounds; it can be orthophosphoric acid, diphosphoric acid, or other polyphosphoric acids. When applying the salts of organophosphates, examples of salts include, for instance, phosphate amine salts and phosphate metal salts. Specific examples of salts can be found in the description of organic acid compound (B).

[0078] Specific examples of organophosphate compounds (C) include cetyl phosphate, cetyl phosphate salt, stearyl phosphate, stearyl phosphate salt, arachidyl phosphate, arachidyl phosphate salt, etc.

[0079] There is no particular limitation on the acid value of organophosphate compounds (C).

[0080] These organophosphate compounds (C) can be used alone or in combination with two or more organophosphate compounds.

[0081] In the treatment agent, the lower limit of the content of organophosphate compound (C) is preferably 5% by mass or more, more preferably 10% by mass or more, and most preferably 20% by mass. When the content of organophosphate compound (C) is 5% by mass or more, the adhesiveness of the fiber surface to which the treatment agent is applied can be reduced. Furthermore, the upper limit of the content of organophosphate compound (C) is preferably 90% by mass or less, more preferably 85% by mass or less, and most preferably 80% by mass or less. When the content of organophosphate compound (C) is 90% by mass or less, the emulsification stability when the treatment agent is prepared as an aqueous dilution can be improved. Any combination of the above upper and lower limits is also possible.

[0082] In the treatment agent, when the total content of the (poly)oxyalkylene derivative (A), organic acid compound (B), and organophosphate compound (C) is set to 100 parts by mass, it is preferable that the total content of the (poly)oxyalkylene derivative (A) and organic acid compound (B) is 20 parts by mass or more and 80 parts by mass or less, and the content of the organophosphate compound (C) is 20 parts by mass or more and 80 parts by mass or less. By defining it within this range, the effect of the present invention can be improved. The range can also be any combination of the above upper and lower limits.

[0083] (pH of the treatment agent)

[0084] The lower limit of the pH of a 5% by mass aqueous dilution of the treatment agent at 25°C is 5.5 or higher. When this pH is 5.5 or higher, the emulsification stability when the treatment agent is prepared as an aqueous dilution can be improved. The upper limit of the pH of a 5% by mass aqueous dilution of the treatment agent at 25°C is 8.5 or lower. When this pH is 8.5 or lower, the reduction in the strength of the fibers to which the treatment agent has been applied can be suppressed. Any combination of the above upper and lower limits is also possible.

[0085] (Save method)

[0086] The treatment agent can be configured as a dosage form 1 containing the above-mentioned components (A) to (C), or, from the viewpoint of improving the stability of the formulation, as a dosage form 2 as shown below.

[0087] The treatment agent of formulation 2 comprises, in groups: a first treatment agent for polyester synthetic fibers containing a (poly)oxyalkylene derivative (A) (hereinafter referred to as "first treatment agent"), and a second treatment agent for polyester synthetic fibers containing an organophosphate compound (C) (hereinafter referred to as "second treatment agent"). Either or both of the first treatment agent and the second treatment agent contain an organic acid compound (B).

[0088] The two-dosage form treatment agent is prepared by combining the first and second treatment agents as separate agents before use, such as during storage or distribution. When used, the first and second treatment agents are mixed to form a mixture.

[0089] (solvent)

[0090] The treatment agent of this embodiment can also be mixed with a solvent as appropriate to prepare a composition containing a treatment agent for polyester synthetic fibers (hereinafter referred to as "the composition containing the treatment agent"), and stored or distributed as a composition containing the treatment agent.

[0091] The solvent has a boiling point below 105°C at atmospheric pressure. Atmospheric pressure in this specification refers to standard atmospheric pressure (101325 Pa = 1 atm). Examples of solvents include water and organic solvents. Specific examples of organic solvents include lower alcohols such as ethanol and propanol, or low-polarity solvents such as hexane. These solvents can be used alone or in appropriate combinations of two or more. Among these, polar solvents such as water and lower alcohols are preferred from the viewpoint of excellent dispersibility or solubility of each component, while water is more preferred from the viewpoint of excellent operability.

[0092] In a composition containing a treatment agent, when the total proportion of the treatment agent and the solvent is set to 100 parts by mass, it is preferable to contain 10 parts by mass or more of the treatment agent.

[0093] The effects of the treatment agent in the first embodiment will be explained.

[0094] (1-1) The treatment agent of the first embodiment described above contains (poly)oxyalkylene derivative (A), the above-mentioned organic acid compound (B), and the above-mentioned organic phosphate compound (C), and the pH of a 5% by mass aqueous dilution of the treatment agent at 25°C is adjusted to 5.5 or more and 8.5 or less.

[0095] Therefore, it can improve the emulsification stability when the treatment agent is made into an aqueous dilution. This reduces the formation of precipitates and / or sediments from the emulsion and minimizes fiber quality inconsistencies caused by uneven adhesion of the treatment agent. Furthermore, it reduces the adhesiveness of the fiber surface treated with the treatment agent and inhibits the reduction of fiber strength. This, in turn, reduces inconsistencies in the quality of processed products caused by poor process flow.

[0096] (1-2) The treatment agent of the first embodiment described above may also be configured to include, in a group, a first treatment agent containing a (poly)oxyalkylene derivative (A) and a second treatment agent containing an organophosphate compound (C). Either or both of the first and second treatment agents contain an organic acid compound (B). According to this configuration, the formulation stability of the treatment agent, especially its storage stability, can be improved.

[0097] <Second Implementation>

[0098] Next, a second embodiment embodying the first treatment agent of the present invention will be described, focusing on the differences from the embodiments described above.

[0099] The first treatment agent of this embodiment contains a (poly)oxyalkylene derivative (A). When used, the first treatment agent is used in conjunction with a second treatment agent or a composition containing a second treatment agent for polyester synthetic fibers (hereinafter referred to as "the composition containing the second treatment agent"), wherein the second treatment agent contains an organophosphate compound (C), and the composition containing the second treatment agent contains the second treatment agent and a solvent (S). Either or both of the first and second treatment agents contain an organic acid compound (B). Furthermore, when the mixture of the first and second treatment agents is prepared as a 5% by mass aqueous dilution of the treatment agent, the pH at 25°C is in the range of 5.5 or higher and 8.5 or lower.

[0100] When the mixture of the first treatment agent and the second treatment agent is a composition containing the second treatment agent (where the solvent (S) is water), the pH is determined by the following method.

[0101] When the mixture of the first and second treatment agents is a water dilution of more than 5% by mass of the treatment agents, the mixture is first diluted to a water dilution of 5% by mass of the treatment agents, and then the pH is measured at 25°C.

[0102] When the mixture of the first and second treatment agents is a water dilution of less than 5% by mass of the treatment agents, the mixture is first dried or concentrated to a water dilution of 5% by mass of the treatment agents, and then the pH is measured at 25°C.

[0103] When the mixture of the first treatment agent and the second treatment agent is used in a composition containing the second treatment agent (wherein the solvent (S) contains a solvent other than water), the pH is determined by the following method.

[0104] The solvent was removed from the mixture of the first and second treatment agents, and then the mixture was diluted with 5% water by mass to obtain a solution of the treatment agents. The pH was then measured at 25°C. The solvent was removed from the mixture by heat-treating the mixture at 105°C for 2 hours.

[0105] The (poly)oxyalkylene derivative (A), organic acid compound (B), organic phosphate compound (C), and solvent (S) are the same as those described in Embodiment 1.

[0106] (solvent)

[0107] The first treatment agent of this embodiment may also be mixed with a solvent as appropriate to prepare a composition containing the first treatment agent for polyester synthetic fibers (hereinafter referred to as "the composition containing the first treatment agent"), and stored or distributed in the manner of the composition containing the first treatment agent.

[0108] The solvent can be any of those exemplified in the first embodiment. In the composition containing the first treatment agent, when the total content ratio of the first treatment agent and the solvent is set to 100 parts by mass, it is preferable to contain 10 parts by mass or more of the first treatment agent.

[0109] The effects of the first treatment agent in the second embodiment will be explained. In addition to the effects of the embodiments described above, the second embodiment also has the following effects.

[0110] (2-1) The first treatment agent of the second embodiment contains a (poly)oxyalkylene derivative (A) and is used in combination with a second treatment agent containing an organophosphate compound (C). Therefore, the formulation stability, especially the storage stability, of the first treatment agent can be improved. Furthermore, by adjusting the mixing ratio with the second treatment agent, the composition of the resulting treatment agent can be adjusted. In addition, the first and second treatment agents can be distributed separately as independent agents.

[0111] <Third Implementation>

[0112] Next, a third embodiment embodying the second processing agent of the present invention will be described, focusing on the differences from the embodiments described above.

[0113] The second treatment agent of this embodiment contains an organophosphate compound (C). The second treatment agent is used in conjunction with the first treatment agent or a composition containing the first treatment agent, wherein the first treatment agent contains a (poly)oxyalkylene derivative (A), and the composition containing the first treatment agent contains the first treatment agent and a solvent (S). Either or both of the first and second treatment agents contain an organic acid compound (B). Furthermore, when the mixture of the first and second treatment agents is a 5% by mass aqueous dilution of the treatment agent, the pH at 25°C is in the range of 5.5 or higher and 8.5 or lower. When the mixture of the first and second treatment agents is used with a composition containing the first treatment agent (with solvent (S)), the pH is measured using the same method as described in the second embodiment.

[0114] The (poly)oxyalkylene derivative (A), organic acid compound (B), organic phosphate compound (C), and solvent (S) are the same as those described in Embodiment 1.

[0115] (solvent)

[0116] The second treatment agent in this embodiment can also be mixed with a solvent as appropriate to prepare a composition containing the second treatment agent, and stored or distributed as a composition containing the second treatment agent.

[0117] The solvent can be any of those exemplified in the first embodiment. In the composition containing the second treatment agent, when the total content ratio of the second treatment agent and the solvent is set to 100 parts by mass, it is preferable to contain 10 parts by mass or more of the second treatment agent.

[0118] The effects of the second processing agent in the third embodiment will be explained. In addition to the effects of the embodiments described above, the third embodiment also has the following effects.

[0119] (3-1) The second treatment agent of the third embodiment contains an organophosphate compound (C) and is used in conjunction with the first treatment agent containing a (poly)oxyalkylene derivative (A). Therefore, the formulation stability, particularly storage stability, of the second treatment agent can be improved. Furthermore, by adjusting the mixing ratio with the first treatment agent, the composition of the resulting treatment agent can be adjusted. Moreover, the second and first treatment agents can be distributed separately as independent agents.

[0120] <Fourth Implementation>

[0121] Next, a fourth embodiment of the method for processing polyester synthetic fibers (hereinafter referred to as the "fiber processing method") of the present invention will be described.

[0122] When the treatment agent is a formulation 1, the fiber treatment method of this embodiment is characterized by applying a diluted solution containing a solvent and the treatment agent of the first embodiment to the polyester synthetic fiber. Examples of methods for preparing the diluted solution include, for instance, adding the treatment agent of the first embodiment or a composition containing the treatment agent to a solvent. Preferably, the diluted solution is prepared by adding the treatment agent of the first embodiment or a composition containing the treatment agent to water.

[0123] When the treatment agent is a two-component formulation, the fiber treatment method of this embodiment is characterized by applying a diluted solution of the treatment agent, comprising a solvent, the first treatment agent of the second embodiment, and the second treatment agent of the third embodiment, to the polyester synthetic fiber. The method for preparing the diluted solution includes, for example, adding the first treatment agent or a composition containing the first treatment agent, and the second treatment agent or a composition containing the second treatment agent to the solvent. Preferably, the diluted solution is prepared by adding the first treatment agent or a composition containing the first treatment agent, and the second treatment agent or a composition containing the second treatment agent to water. The preferred ratio of the first treatment agent to the second treatment agent is a mass ratio of non-volatile components of first treatment agent / second treatment agent = 95 / 5 to 5 / 95. By defining this range, operability can be improved. In this specification, non-volatile components refer to the residue after the object has been heat-treated at 105°C for 2 hours to fully remove volatile substances, i.e., the absolutely dry matter.

[0124] The solvent used to manufacture the diluent can be exemplified by that described in the first embodiment. From the viewpoint of operability, the diluent is preferably of a concentration of 0.1% by mass or more and 10% by mass or less for the treatment agent.

[0125] In the method of using the first treatment agent and the second treatment agent together, the mixing ratio of each agent can be arbitrarily changed. Therefore, even under different manufacturing conditions such as different manufacturing equipment or different climates such as temperature and humidity, the treatment agent or diluent with the best properties to impart fiber characteristics or fiber manufacturing characteristics can be easily prepared by fine-tuning the mixing ratio.

[0126] For emulsifying agents, the agents or compositions containing the agents can be mixed with solvents and stirred using known mixers, such as homogenizers, homogenizers, gel mills, linear mixers, etc.

[0127] The fiber treatment method is, for example, to apply the diluted solution obtained in the above manner to the fiber in at least one of the spinning, stretching and finishing steps of polyester synthetic fibers.

[0128] Fibers that are given a diluent include polyester synthetic fibers. Specific examples of polyester synthetic fibers include polyethylene terephthalate (PET), polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polylactic acid, and composite fibers formed containing these polyester resins.

[0129] The uses of the fiber are not particularly limited, and examples include those for spinning, spinning manufacturing, staple fiber, long fiber, nonwoven fabric, and filling cotton. Staple fiber generally refers to fibers called "staple" and does not include long fibers called "filament". Furthermore, the length of the staple fiber is not particularly limited as long as it meets the definition of staple fiber in this technical field, for example, 100 mm or less. Among these, the diluent of the present invention is preferably suitable for polyester staple fibers and polyester synthetic fibers for spinning manufacturing.

[0130] There is no particular limitation on the proportion of the diluent adhering to the fiber, but it is preferable that the final solid content is 0.01% by mass or more and 10% by mass or less, more preferably 0.1% by mass or more and 3% by mass or less. With this configuration, the performance of each component can be effectively utilized. Furthermore, there is no particular limitation on the method of adhering the diluent; known methods can be used depending on the type of fiber, method, and application, such as roller oiling, guided oiling using a metering pump, impregnation oiling, and spray oiling. When using the impregnation oiling method, the impregnation time is preferably 1 minute or more and 5 minutes or less.

[0131] Fibers treated with a diluent can also be dried or heated using known methods. By drying or heating, solvents such as water are evaporated, thereby obtaining fibers with the treatment agent or components contained in the first and second treatment agents.

[0132] The effects of the fiber processing method according to the fourth embodiment will be explained. In addition to the effects of the embodiments described above, the fourth embodiment also has the following effects.

[0133] (4-1) The fiber treatment method of the fourth embodiment is, for example, a method of imparting a diluent to the fiber during a spinning step, a stretching step, or a finishing step. In particular, by adding the treatment agent of the first embodiment or a composition containing the treatment agent to water for preparation, a diluent with excellent emulsification stability can be obtained. Alternatively, by adding the first treatment agent or a composition containing the first treatment agent and the second treatment agent or a composition containing the second treatment agent to water for preparation, a diluent with excellent emulsification stability can be obtained. Therefore, the efficiencies of each component for spinning, spinning manufacturing, short fibers, long fibers, nonwoven fabrics, filling cotton, etc., can be effectively utilized.

[0134] The above-described embodiments can also be modified as follows. The above-described embodiments and the following modifications can be combined and implemented with each other within the scope of technical non-contradiction.

[0135] • The method for preparing the diluent of the treatment agent in the above embodiments is not particularly limited, and other methods besides the preparation method described in the fourth embodiment may also be used.

[0136] • Without impairing the effects of the present invention, the treatment agents, compositions, or diluents described in the above embodiments may be further mixed with other components used to maintain the quality of the treatment agents, compositions, or diluents, such as other solvents, stabilizers, antistatic agents, binders, antioxidants, ultraviolet absorbers, organic acids, surfactants other than those mentioned above, and other components commonly used in treatment agents. From the viewpoint of effectively utilizing the performance of the present invention, it is preferable that other components other than solvents, which are commonly used in treatment agents, are 10% by mass or less in each treatment agent. Furthermore, these other components may be stored separately from the aforementioned treatment agents.

[0137] Example

[0138] The following embodiments are provided to illustrate the structure and effects of the present invention in more detail, but the present invention is not limited to these embodiments. Unless otherwise specified, in the following embodiments and comparative examples, parts represent parts by mass, and % represents percentages by mass.

[0139] Test Category 1 (Preparation of Formulation Treatment Agent)

[0140] (Example 1-1)

[0141] As shown in Table 1, the treatment agent of Example 1-1 was prepared, which contained 25 parts (%) of polyoxyethylene (10 (representing the number of moles of alkylene oxide added. The same applies below)) decylamine (A-1) as (poly)oxyalkylene derivative (A), 10 parts (%) of polyoxyethylene (5)decyl ether (A-10), 7 parts (%) of (polyoxyethylene)(polyoxypropylene)(r+s=10, r is the number of moles of ethylene oxide added, s is the number of moles of propylene oxide added (the same applies below)) tridecyl ether (A-21), 8 parts (%) of oxalic acid / potassium oxalate salt = 50 / 50 (mass ratio) (B-1) as organic acid compound (B), 50 parts (%) of cetyl phosphate and its potassium salt (C-3) as organic phosphate compound (C), and 3 parts (D-1) of polydimethylsiloxane as other component (D) (total 100 parts relative to components (A) to (C)).

[0142] (Examples 1-2 to 1-28, Comparative Examples 1-1 to 1-10)

[0143] The treatment agents of Examples 1-2 to 1-28 and Comparative Examples 1-1 to 1-10 were prepared in the same manner as the treatment agent of Example 1-1, and contained (poly)oxyalkylene derivatives (A), organic acid compounds (B), organic phosphate compounds (C), and other components (D) in the proportions shown in Table 1.

[0144] The types and contents of (poly)oxyalkylene derivatives (A), organic acid compounds (B), organophosphate compounds (C), and other components (D) are shown in the columns “(poly)oxyalkylene derivatives (A)”, “organic acid compounds (B)”, “organophosphate compounds (C)”, and “other components (D)” of Table 1, respectively. The content of other components (D) indicates the mixing amount (parts) when the total content of (poly)oxyalkylene derivatives (A), organic acid compounds (B), and organophosphate compounds (C) in the treatment agent is set to 100 parts.

[0145] (pH of the treatment agent)

[0146] Each treatment agent was diluted with warm water at approximately 70°C to prepare a 5% aqueous dilution. The pH of the prepared 5% aqueous dilution was measured at 25°C. The measured values ​​are shown in the "pH of 5% aqueous dilution" column of Table 1.

[0147] [Table 1]

[0148]

[0149] The details of the (poly)oxyalkylene derivatives (A), organic acid compounds (B), organic phosphate compounds (C), and other components (D) listed in Table 1 are as follows.

[0150] ((poly)oxyalkylene derivative (A))

[0151] Use A-1 to A-39 as described in Table 2 below.

[0152] [Table 2]

[0153]

[0154] (Organic acid compound (B))

[0155] Use B-1 to B-21 as described in Table 3 below.

[0156] [Table 3]

[0157]

[0158] (Organophosphate compounds (C))

[0159] Use C-1 to C-14 as listed in Table 4 below. The organophosphate compounds (C) listed in Table 4 below are compounds of various organophosphates that have been partially neutralized with KOH, i.e., mixtures of organophosphates and potassium salts of organophosphates. The same applies to organophosphate compounds D-5 and D-6, which are described later.

[0160] [Table 4]

[0161]

[0162] The method for determining the acid value of organophosphate compounds (C) is as follows.

[0163] The organophosphate compound (C) was dissolved in a mixed solvent of ethanol / xylene (1 / 2, volume ratio), and titrated with a 0.1 mol / L potassium hydroxide methanol standard solution using a potentiometric method. The following value was calculated. The results are shown in the "Acid Value Detected from Organophosphate Compound (C)" column of Table 4.

[0164] [Number 1]

[0165]

[0166] In number 1,

[0167] f represents the factor for a 0.1 mol / L potassium hydroxide methanol standard solution.

[0168] S represents the amount (g) of organophosphate compound (C) taken.

[0169] R represents the volume (mL) of 0.1 mol / L potassium hydroxide methanol standard solution used up to the inversion point.

[0170] (Other ingredients (D))

[0171] D-1: Polydimethylsiloxane

[0172] D-2: Amino-modified polydimethylsiloxane

[0173] D-3: Stearyl alcohol

[0174] D-4: Polyvinyl alcohol (degree of polymerization 300, degree of saponification 80)

[0175] D-5: Hexyl phosphate and its potassium salt

[0176] D-6: Dodecyl phosphate and its potassium salt

[0177] D-7: Sodium ditetradecyl sulfosuccinate

[0178] D-8: Tetraglyceride monooctadecanoate

[0179] D-9: Dipotassium hydrogen phosphate

[0180] Test Category 2 (Emulsion Stability)

[0181] Each treatment agent prepared in Test Category 1 was diluted with warm water at approximately 70°C to prepare a 1% dilution. The prepared 1% dilution was allowed to stand at 50°C for 24 hours. The appearance of the diluted solution after standing was visually confirmed and evaluated using the following criteria. The results are shown in the "Emulsion Stability" column of Table 1.

[0182] • Evaluation criteria for emulsification stability

[0183] ◎(Good): No precipitates or sediments were observed in the lower layer.

[0184] ○ (Pass): Visible precipitates or sediment in the lower layer, which disappear upon manual stirring with a stirring rod.

[0185] × (Poor): Visible precipitates or sediment in the lower layer, which do not disappear even with manual stirring with a stirring rod.

[0186] Test Category 3 (Adhesion)

[0187] Pour 5g of each treatment agent prepared in Test Category 1 into a glass petri dish (9.5cm inner diameter). The treatment agent will then spread evenly within the glass petri dish. Adjust the temperature at 30°C and 70% RH for 24 hours, visually confirming the appearance of the temperature-adjusted treatment agent, and evaluate it using the following criteria. The results are shown in the "Adhesion" column of Table 1.

[0188] • Evaluation criteria for adhesion

[0189] ◎(Good): After temperature adjustment, it appears as a solid and does not feel sticky to the touch.

[0190] ○ (Pass): After temperature adjustment, the product appears solid and feels sticky to the touch.

[0191] × (Defective): After temperature adjustment, the product appears as a liquid or gel and feels sticky to the touch.

[0192] Test Category 4 (Fiber Strength)

[0193] Each treatment agent prepared for Test Category 1 was diluted with warm water at approximately 70°C to prepare a 0.5% dilution. The prepared treatment agent was sprayed onto untreated polyester fibers (1.3 de × 38 mm) to achieve an application rate of 0.15% relative to the polyester fiber. The treated polyester fibers were dried in a dryer at 80°C for 2 hours, and then the initial strength of the fiber was determined using a tensile testing machine. Furthermore, the strength of the fiber after 3 months at 50°C and 80% RH was determined using a tensile testing machine. The strength after 3 months was compared with the initial strength, and evaluated using the following benchmarks. The results are shown in the "Fiber Strength" column of Table 1.

[0194] • Evaluation criteria for fiber strength

[0195] ◎(Good): The strength after 3 months is more than 95% of the initial strength.

[0196] 〇 (Pass): The strength after 3 months is more than 90% but less than 95% of the initial strength.

[0197] × (Undesirable): Strength after 3 months is less than 90% of initial strength.

[0198] Test Category 5 (Preparation of the first treatment agent for 2 dosage form treatment agents)

[0199] (First treatment agent (IA-1))

[0200] As shown in Table 5, the first treatment agent (IA-1) was prepared, which contained 50 parts (%) of polyoxyethylene (10) decylamine (A-1) as (poly)oxyalkylene derivative (A) shown in Table 2, 20 parts (%) of polyoxyethylene (5) decyl ether (A-10), 14 parts (%) of (polyoxyethylene)(polyoxypropylene)(r+s=10) tridecyl ether (A-21), and 16 parts (%) of oxalic acid / potassium oxalate salt = 50 / 50 (mass ratio) (B-1) as organic acid compound (B).

[0201] (First treatment agent (IA-2)~(IA-27), First treatment agent (IB-1)~(IB-27), First treatment agent (IC-1))

[0202] The (poly)oxyalkylene derivative (A) and organic acid compound (B) in the proportions shown in Table 5 were prepared in the same manner as the first treatment agent (IA-1).

[0203] The types and contents of (poly)oxyalkylene derivatives (A) and organic acid compounds (B) are shown in the "(poly)oxyalkylene derivatives (A)" and "organic acid compounds (B)" columns of Table 5, respectively.

[0204] [Table 5]

[0205]

[0206] Test Category 6 (Preparation of the second treatment agent for 2 dosage form treatment agents)

[0207] (Second Treatment Agent (II-A-1))

[0208] As shown in Table 6, a second treatment agent (II-A-1) was prepared, which contained 100 parts (%) of cetyl phosphate as an organophosphate compound (C) and its potassium salt (C-1).

[0209] (Second treatment agent (II-A-2)~(II-A-16), Second treatment agent (II-B-1)~(II-B-27), Second treatment agent (II-C-1))

[0210] Organophosphate compound (C) and organic acid compound (B) in the proportions shown in Table 6 were prepared in the same manner as the second treatment agent (II-A-1).

[0211] The types and contents of organophosphate compounds (C) and organic acid compounds (B) are shown in the "Organophosphate Compounds (C)" and "Organic Acid Compounds (B)" columns of Table 6, respectively.

[0212] [Table 6]

[0213]

[0214] Test Category 7 (Evaluation of Formulation Stability)

[0215] • Formulation stability evaluation of the first treatment agent

[0216] Each of the first-stage treatments described in test category 5 was stored at 25°C for 3 days. The formulation stability was evaluated using the following benchmarks. The results are shown in the “Formulation Stability” column of Table 5.

[0217] • Formulation stability evaluation of the second treatment agent

[0218] Compositions containing the second treatment agents described in test category 6 and water as solvent (mass ratio of second treatment agent: water = 40:60) were stored at 25°C for 3 days. The formulation stability was evaluated using the following criteria. The results are shown in the "Formulation Stability" column of Table 6.

[0219] • Evaluation criteria for formulation stability (compositions containing first and second treatment agents)

[0220] ○ (Good): Not gelled or cured

[0221] × (Unacceptable): Gelped or cured

[0222] Test Category 8 (Treatment prepared from Treatment Agent 1 and Treatment Agent 2)

[0223] (Example 2-A-1)

[0224] The treatment agent of Example 2-A-1 was prepared by mixing 50% (parts) of the first treatment agent (IA-1) and 50% (parts) of the second treatment agent (II-A-3) shown in Table 7, and also mixing 3 parts of the treatment agent (III-1) shown in Table 8 as another treatment agent (D) (relative to a total of 100 parts of the first and second treatment agents).

[0225] (Examples (2-A-2)~(2-A-28), Examples (2-B-1)~(2-B-28), Examples (2-C-1)~(2-C-2))

[0226] The treatment agents for each example were prepared in the same manner as in Example 2-A-1, and in addition to mixing the first and second treatment agents shown in Table 7, other treatment agents (D) shown in Table 8 were also mixed as needed.

[0227] The types and mass ratios of the first treatment agent, the second treatment agent, and other treatment agents (D) are shown in the "First Treatment Agent (I)", "Second Treatment Agent (II)", and "Other Treatment Agents (D)" columns of Table 7, respectively. The content of other treatment agents (D) indicates the mixing amount (parts) when the total mixing amount of the first and second treatment agents is set to 100 parts.

[0228] (pH measurement)

[0229] The first and second treatment agents shown in Table 7 were mixed and diluted with warm water at approximately 70°C to prepare a 5% aqueous dilution of the treatment agent. In the example using another treatment agent (D), the first, second, and other treatment agents (D) were mixed and diluted with warm water at approximately 70°C to obtain a 5% aqueous dilution of the treatment agent. The pH of the prepared 5% aqueous dilutions was measured at 25°C. The measured values ​​are shown in the "pH of 5% aqueous dilution" column of Table 7.

[0230] [Table 7]

[0231]

[0232] The other treatment agents (D) listed in Table 7 are the treatment agents (III-1) to (III-4) listed in Table 8 below. The treatment agents (III-1) to (III-4) are prepared in a manner that includes the other treatment agents (D) in the proportions shown in Table 8.

[0233] [Table 8]

[0234]

[0235] Test Category 9 (Evaluation of two dosage forms of treatment agents)

[0236] Using the treatment agents obtained in each example, emulsion stability, adhesion, and fiber strength were evaluated in the same manner as in Example 1. The method for preparing the diluent used in evaluating emulsion stability and fiber strength was the same as that described in Test Category 8 (pH Measurement). The first treatment agent, the second treatment agent, and any other treatment agent (D) as needed were mixed and diluted with water to prepare the diluted treatment agent solution. The results are shown in the "Emulsion Stability," "Adhesion," and "Fiber Strength" columns of Table 7, respectively.

[0237] As can be clearly seen from the evaluation results of each embodiment relative to the comparative examples in each table, the treatment agent of the present invention can improve the emulsion stability when the solution is made into an aqueous dilution. Furthermore, it can reduce the adhesiveness of the fiber surface to which the treatment agent is applied and can suppress the reduction in fiber strength.

[0238] This disclosure also includes the following methods.

[0239] (Appendix 1)

[0240] A treatment agent for polyester synthetic fibers contains a (poly)oxyalkylene derivative (A), the following organic acid compound (B), and the following organic phosphate compound (C);

[0241] Its features are,

[0242] The pH of a 5% by mass aqueous solution of the above-mentioned polyester synthetic fiber treatment agent at 25°C is 5.5 or higher and 8.5 or lower.

[0243] Organic acid compound (B): selected from at least one of organic acids, organic acid salts, and organic acid anhydrides;

[0244] Organic phosphate compound (C): selected from at least one of organic phosphates having a hydrocarbon group having 16 or more and 20 carbon atoms in the molecule, and salts thereof.

[0245] (Appendix 2)

[0246] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0247] The organic acid compound (B) mentioned above is at least one selected from mono- to pentacarboxylic acids having 0 to 9 carbon atoms other than those derived from the carboxyl group, salts of mono- to pentacarboxylic acids having 0 to 9 carbon atoms other than those derived from the carboxyl group, and di- to pentacarboxylic anhydrides having 0 to 9 carbon atoms other than those derived from the carboxyl group.

[0248] (Appendix 3)

[0249] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0250] The aforementioned (poly)oxyalkylene derivative (A) comprises at least one selected from polyoxyalkylene alkylamines and polyoxyalkylene alkenylamines.

[0251] (Appendix 4)

[0252] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0253] When the total content ratio of the above-mentioned (poly)oxyalkylene derivative (A), the above-mentioned organic acid compound (B), and the above-mentioned organophosphate compound (C) is set to 100 parts by mass, the total content ratio of the above-mentioned (poly)oxyalkylene derivative (A) and the above-mentioned organic acid compound (B) is 20 parts by mass or more and 80 parts by mass or less, and the content ratio of the above-mentioned organophosphate compound (C) is 20 parts by mass or more and 80 parts by mass or less.

[0254] (Appendix 5)

[0255] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0256] The composition comprises, in groups: a first treatment agent for polyester synthetic fibers containing the above-mentioned (poly)oxyalkylene derivative (A), and a second treatment agent for polyester synthetic fibers containing the above-mentioned organophosphate compound (C);

[0257] The first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers, or both of them, contain the organic acid compound (B).

[0258] (Appendix 6)

[0259] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0260] The aforementioned polyester synthetic fibers are polyester staple fibers.

[0261] (Appendix 7)

[0262] The treatment agent for polyester synthetic fibers as described in Appendix 1, wherein...

[0263] The aforementioned polyester synthetic fibers are used for spinning.

[0264] (Appendix 8)

[0265] A composition containing a treatment agent for polyester synthetic fibers, characterized in that,

[0266] The treatment agent for polyester synthetic fibers contained in any one of Appendices 1 to 7 and the following solvent (S);

[0267] Solvent (S): A solvent with a boiling point below 105°C at atmospheric pressure.

[0268] (Appendix 9)

[0269] A first treatment agent for polyester synthetic fibers contains a (poly)oxyalkylene derivative (A) and is used in combination with a second treatment agent for polyester synthetic fibers or a composition containing a second treatment agent for polyester synthetic fibers.

[0270] The second treatment agent for the above-mentioned polyester synthetic fibers contains the following organophosphate compound (C);

[0271] The above-mentioned composition containing the second treatment agent for polyester synthetic fibers contains the second treatment agent for polyester synthetic fibers and the following solvent (S);

[0272] Its features are,

[0273] The first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers mentioned above, or both of them, contain the following organic acid compound (B);

[0274] When the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers is set as a 5% by mass water dilution, the pH at 25°C is 5.5 or higher and 8.5 or lower.

[0275] Organic acid compound (B): selected from at least one of organic acids, organic acid salts, and organic acid anhydrides;

[0276] Organic phosphate compound (C): selected from at least one of organic phosphates having a hydrocarbon group having 16 or more and 20 carbon atoms in the molecule, and salts thereof;

[0277] Solvent (S): A solvent with a boiling point below 105°C at atmospheric pressure.

[0278] (Appendix 10)

[0279] A composition containing a first treatment agent for polyester synthetic fibers, characterized in that,

[0280] Contains the first treatment agent for polyester synthetic fibers as described in Appendix 9 and the following solvent (S);

[0281] Solvent (S): A solvent with a boiling point below 105°C at atmospheric pressure.

[0282] (Appendix 11)

[0283] A second treatment agent for polyester synthetic fibers contains the following organophosphate compound (C) and is used in combination with a first treatment agent for polyester synthetic fibers or a composition containing the first treatment agent for polyester synthetic fibers.

[0284] The first treatment agent for the aforementioned polyester synthetic fibers contains a (poly)oxyalkylene derivative (A);

[0285] The above-mentioned composition containing the first treatment agent for polyester synthetic fibers contains the first treatment agent for polyester synthetic fibers and the following solvent (S);

[0286] Its features are,

[0287] The first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers mentioned above, or both of them, contain the following organic acid compound (B);

[0288] When the mixture of the first treatment agent for polyester synthetic fibers and the second treatment agent for polyester synthetic fibers is set as a 5% by mass water dilution, the pH at 25°C is 5.5 or higher and 8.5 or lower.

[0289] Organic acid compound (B): selected from at least one of organic acids, organic acid salts, and organic acid anhydrides;

[0290] Organic phosphate compound (C): selected from at least one of organic phosphates having a hydrocarbon group having 16 or more and 20 carbon atoms in the molecule, and salts thereof;

[0291] Solvent (S): A solvent with a boiling point below 105°C at atmospheric pressure.

[0292] (Appendix 12)

[0293] A composition containing a second treatment agent for polyester synthetic fibers, characterized in that,

[0294] Contains the second treatment agent for polyester synthetic fibers as described in Appendix 11 and the following solvent (S);

[0295] Solvent (S): A solvent with a boiling point below 105°C at atmospheric pressure.

[0296] (Appendix 13)

[0297] A diluent for a treatment agent used on polyester synthetic fibers, characterized in that,

[0298] The treatment agent for polyester synthetic fibers contains any one of the ingredients in Appendices 1 to 7, wherein the concentration of the treatment agent for polyester synthetic fibers is 0.1% by mass or more and 10% by mass or less.

[0299] (Appendix 14)

[0300] A method for processing polyester synthetic fibers, characterized in that,

[0301] A diluted solution of a treatment agent for polyester synthetic fibers;

[0302] The diluted solution of the above-mentioned polyester synthetic fiber treatment agent is obtained by adding the polyester synthetic fiber treatment agent described in any one of Appendices 1 to 7 to water.

[0303] (Appendix 15)

[0304] A method for processing polyester synthetic fibers, characterized in that,

[0305] A diluted solution of a treatment agent for polyester synthetic fibers;

[0306] The diluted solution of the above-mentioned polyester synthetic fiber treatment agent is obtained by adding the composition containing the polyester synthetic fiber treatment agent described in Appendix 8 to water.

[0307] (Appendix 16)

[0308] A method for processing polyester synthetic fibers, characterized in that,

[0309] A diluted solution of a treatment agent for polyester synthetic fibers;

[0310] The diluted solution of the above-mentioned polyester synthetic fiber treatment agent is obtained by adding the first polyester synthetic fiber treatment agent described in Appendix 9 or the composition containing the first polyester synthetic fiber treatment agent described in Appendix 10, the second polyester synthetic fiber treatment agent described in Appendix 11 or the composition containing the second polyester synthetic fiber treatment agent described in Appendix 12 to water.

[0311] (Appendix 17)

[0312] A polyester synthetic fiber, characterized in that,

[0313] A treatment agent for polyester synthetic fibers attached with any one of the appendices 1 to 7.

Claims

1. A treating agent for polyester synthetic fibers, characterized by containing 5 mass% or more of a (poly)oxyalkylene derivative (A), 1 mass% or more of an organic acid compound (B), and 5 mass% or more of an organic phosphate compound (C), wherein a 5 mass% aqueous dilution of the treating agent for polyester synthetic fibers has a pH of 5.5 or more and 8.5 or less at 25°C, the treating agent for polyester synthetic fibers does not contain a solvent, the (poly)oxyalkylene derivative (A) contains at least one selected from the group consisting of polyoxyalkylene alkylamines and polyoxyalkylene alkenylamines, the organic acid compound (B) is at least one selected from the group consisting of organic acids, salts of organic acids, and anhydrides of organic acids, the organic phosphate compound (C) is at least one selected from the group consisting of organic phosphates having a hydrocarbon group with 16 or more and 20 or less carbon atoms in the molecule, and salts thereof.

2. The treating agent for polyester synthetic fibers according to claim 1, wherein the organic acid compound (B) is at least one selected from the group consisting of one- to five-membered carboxylic acids having 0 or more and 9 or less carbon atoms other than a carbon atom derived from a carboxyl group, salts of one- to five-membered carboxylic acids having 0 or more and 9 or less carbon atoms other than a carbon atom derived from a carboxyl group, and two- to five-membered carboxylic anhydrides having 0 or more and 9 or less carbon atoms other than a carbon atom derived from a carboxyl group.

3. The treating agent for polyester synthetic fibers according to claim 1, wherein when the total of the contained proportions of the (poly)oxyalkylene derivative (A), the organic acid compound (B), and the organic phosphate compound (C) is taken as 100 parts by mass, the total contained proportion of the (poly)oxyalkylene derivative (A) and the organic acid compound (B) is 20 parts by mass or more and 80 parts by mass or less, and the contained proportion of the organic phosphate compound (C) is 20 parts by mass or more and 80 parts by mass or less.

4. The treating agent for polyester synthetic fibers according to claim 1, wherein a first treating agent for polyester synthetic fibers containing the (poly)oxyalkylene derivative (A) and a second treating agent for polyester synthetic fibers containing the organic phosphate compound (C) are contained in a set, either or both of the first treating agent for polyester synthetic fibers and the second treating agent for polyester synthetic fibers contain the organic acid compound (B).

5. The treating agent for polyester synthetic fibers according to claim 1, wherein the polyester synthetic fibers are polyester staple fibers.

6. The treating agent for polyester synthetic fibers according to claim 1, wherein the polyester synthetic fibers are for use in spinning.

7. A composition containing a treating agent for polyester synthetic fibers, characterized by containing the treating agent for polyester synthetic fibers according to any one of claims 1 to 6 and a solvent (S), the solvent (S) is a solvent having a boiling point of 105°C or less at atmospheric pressure.

8. A first treating agent for polyester synthetic fibers containing a (poly)oxyalkylene derivative (A), which is used in combination with a second treating agent for polyester synthetic fibers or a composition containing a second treating agent for polyester synthetic fibers. The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), Either or both of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent contains the following organic acid compound (B), When a mixture of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent is made into a 5 mass% aqueous dilution, the pH at 25°C is 5.5 or more and 8.5 or less, and the mixture does not contain a solvent, The mixture of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent contains the above-mentioned (poly)oxyalkylene derivative (A) of 5 mass% or more, the above-mentioned organic acid compound (B) of 1 mass% or more, and the above-mentioned organic phosphate ester compound (C) of 5 mass% or more, and the mixture does not contain a solvent, The above-mentioned (poly)oxyalkylene derivative (A) includes at least one selected from the group consisting of polyoxyalkylene alkylamines and polyoxyalkylene alkenylamines, The organic acid compound (B) is at least one selected from the group consisting of organic acids, organic acid salts, and organic acid anhydrides, The organic phosphate ester compound (C) is at least one selected from the group consisting of organic phosphate esters having a hydrocarbon group with a carbon number of 16 or more and 20 or less in the molecule, and salts thereof, The solvent (S) is a solvent having a boiling point of 105°C or less at atmospheric pressure.

9. A composition containing a polyester synthetic fiber first treatment agent, characterized in that The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), The solvent (S) is a solvent having a boiling point of 105°C or less at atmospheric pressure.

10. A polyester synthetic fiber second treatment agent containing the following organic phosphate ester compound (C), and used in combination with a polyester synthetic fiber first treatment agent or a composition containing a polyester synthetic fiber first treatment agent, The above-mentioned polyester synthetic fiber first treatment agent contains a (poly)oxyalkylene derivative (A), The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), The above-mentioned polyester synthetic fiber second treatment agent contains the following organic phosphate ester compound (C), Either or both of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent contains the following organic acid compound (B), When a mixture of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent is made into a 5 mass% aqueous dilution, the pH at 25°C is 5.5 or more and 8.5 or less, and the mixture does not contain a solvent, The mixture of the above-mentioned polyester synthetic fiber first treatment agent and the above-mentioned polyester synthetic fiber second treatment agent contains the above-mentioned (poly)oxyalkylene derivative (A) of 5 mass% or more, the above-mentioned organic acid compound (B) of 1 mass% or more, and the above-mentioned organic phosphate ester compound (C) of 5 mass% or more, and the mixture does not contain a solvent, The above (poly)oxyalkylene derivative (A) contains at least one selected from the group consisting of a polyoxyalkylene alkylamine and a polyoxyalkylene alkenylamine, the organic acid compound (B) is at least one selected from the group consisting of an organic acid, an organic acid salt, and an organic acid anhydride, the organic phosphate compound (C) is at least one selected from the group consisting of an organic phosphate having a hydrocarbon group with a carbon number of 16 or more and 20 or less in the molecule, and a salt thereof, the solvent (S) is a solvent having a boiling point of 105°C or lower at atmospheric pressure.

11. A composition containing a second treating agent for a polyester-based synthetic fiber, characterized by containing the second treating agent for a polyester-based synthetic fiber according to claim 10 and the following solvent (S), the solvent (S) is a solvent having a boiling point of 105°C or lower at atmospheric pressure.

12. A dilution of a treating agent for a polyester-based synthetic fiber, characterized by containing the treating agent for a polyester-based synthetic fiber according to any one of claims 1 to 6, the concentration of the treating agent for a polyester-based synthetic fiber being 0.1 mass% or more and 10 mass% or less.

13. A treatment method for a polyester-based synthetic fiber, characterized by applying a dilution of a treating agent for a polyester-based synthetic fiber to a polyester-based synthetic fiber, the dilution of the treating agent for a polyester-based synthetic fiber is obtained by adding the treating agent for a polyester-based synthetic fiber according to any one of claims 1 to 6 to water.

14. A treatment method for a polyester-based synthetic fiber, characterized by applying a dilution of a treating agent for a polyester-based synthetic fiber to a polyester-based synthetic fiber, the dilution of the treating agent for a polyester-based synthetic fiber is obtained by adding the composition containing the treating agent for a polyester-based synthetic fiber according to claim 7 to water.

15. A treatment method for a polyester-based synthetic fiber, characterized by applying a dilution of a treating agent for a polyester-based synthetic fiber to a polyester-based synthetic fiber, the dilution of the treating agent for a polyester-based synthetic fiber is obtained by adding the first treating agent for a polyester-based synthetic fiber according to claim 8 or the composition containing the first treating agent for a polyester-based synthetic fiber according to claim 9, the second treating agent for a polyester-based synthetic fiber according to claim 10 or the composition containing the second treating agent for a polyester-based synthetic fiber according to claim 11 to water.

16. A polyester-based synthetic fiber, characterized by having attached thereto the treating agent for a polyester-based synthetic fiber according to any one of claims 1 to 6.

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