Synthetic fiber treatment agent, synthetic fiber, and method for producing synthetic fiber treatment agent

Abstract

The present invention addresses the problem of providing a synthetic fiber treatment agent and the like that can improve tar cleanability and achieve low smoke generation. The treatment agent for synthetic fibers according to the present invention contains an ester compound (A), and is characterized in that the peroxide value detected from the treatment agent for synthetic fibers is 100 meq / kg or less.

Description

Technical Field

[0001] The present invention relates to a synthetic fiber treatment agent capable of improving tar cleaning performance and achieving low smoke generation, synthetic fiber, and a method for producing the synthetic fiber treatment agent. Background Art

[0002] For example, in the spinning and drawing process of synthetic fibers, a fiber surface may be treated with a fiber treatment agent in order to improve smoothness, antistatic properties, and the like. Currently, there are known synthetic fiber treatment agents disclosed in Patent Documents 1 to 3. Patent Document 1 discloses a lubricating treatment composition for synthetic fibers, which has been subjected to a heat treatment step containing a specific bisphenol A alkylene oxide adduct. Patent Document 2 discloses a synthetic fiber treatment agent, which contains an ester compound formed by at least one selected from an organic acid having a sulfur element in the molecule and an ester-forming derivative of an organic acid having a sulfur element in the molecule and a Guerbet alcohol having 6 to 22 carbon atoms. Patent Document 3 discloses a synthetic fiber treatment agent, which contains an ester compound having a specific thioether bond, wherein the acid value is 0.2 to 10 mgKOH / g and the ash content is 0.01 to 0.5% by mass.

[0003] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Laid-Open No. 52-155299 Patent Document 2: Japanese Patent Application Publication No. 2020-094304 Patent Document 3: Japanese Patent Application Publication No. 2018-150665 Summary of the invention Problems to be solved by the invention

[0004] However, conventional synthetic fiber treatment agents are still required to improve tar cleaning properties and low smoke generation properties. Means for solving problems

[0005] The present inventors have conducted studies to solve the above problems and have found that, in a synthetic fiber treating agent, a configuration in which the peroxide value detected from the synthetic fiber treating agent is limited to a specific range is particularly effective.

[0006] Each means for solving the above-mentioned problems will be described. Embodiment 1: A synthetic fiber treatment agent comprising an ester compound (A), wherein a peroxide value detected in the synthetic fiber treatment agent is 100 meq / kg or less.

[0007] Aspect 2: The synthetic fiber processing agent according to aspect 1, wherein a peroxide value detected in the synthetic fiber processing agent is 50 meq / kg or less. Aspect 3: The synthetic fiber processing agent according to aspect 1 or 2, wherein the ester compound (A) includes an ester compound (A1) having a thioether bond in the molecule.

[0008] Aspect 4: The synthetic fiber processing agent according to any one of aspects 1 to 3, wherein the ester compound (A) comprises a complete ester compound (A2) of a trivalent or higher and tetravalent or lower polyol and a fatty acid.

[0009] Aspect 5: The synthetic fiber processing agent according to any one of aspects 1 to 4, further comprising an ionic surfactant (B). Embodiment 6: The synthetic fiber processing agent according to Embodiment 5, wherein the ionic surfactant (B) contains a sulfonic acid compound (B1).

[0010] Aspect 7: The synthetic fiber treating agent according to any one of aspects 1 to 6, wherein Furthermore, it contains a nonionic surfactant (C). Aspect 8: The synthetic fiber processing agent according to aspect 7, wherein the nonionic surfactant (C) comprises a compound (C1) in which an alkylene oxide is added to a primary organic amine.

[0011] Embodiment 9: A synthetic fiber, wherein the synthetic fiber treatment agent according to any one of embodiments 1 to 8 is attached thereto. Method 10: A method for producing a synthetic fiber treatment agent, wherein the synthetic fiber treatment agent according to any one of methods 1 to 8 is produced, wherein the filling rate calculated from the following formula (1) at 25°C under atmospheric pressure is set to be greater than 60% by volume and less than 100% by volume.

[0012] [Number 1] Effects of the Invention

[0013] According to the present invention, it is possible to improve tar cleaning performance and achieve low smoke generation. DETAILED DESCRIPTION

[0014] <First embodiment> The first embodiment of the synthetic fiber treatment agent (hereinafter referred to as the treatment agent) of the present invention will be described below. The treatment agent of this embodiment contains an ester compound (A), and the peroxide value detected in the treatment agent is 100 meq / kg or less.

[0015] (Ester compound (A)) The ester compound (A) is not particularly limited as long as it can be used as a lubricant in the field of treatment agents, and examples thereof include ester compounds made from fatty acids and alcohols. The ester compound (A) can also be made from fatty acids and alcohols having an odd or even number of hydrocarbon groups, such as those described later. The fatty acids used as the raw materials of the ester compounds are not particularly limited in terms of the number of carbon atoms, the presence or absence of branches, the valence, etc., and can be, for example, higher fatty acids, fatty acids with rings, and fatty acids with aromatic rings. The alcohols used as the raw materials of the ester compounds are not particularly limited in terms of the number of carbon atoms, the presence or absence of branches, the valence, etc., and can be, for example, higher alcohols, alcohols with rings, and alcohols with aromatic rings.

[0016] The ester compound (A) preferably includes an ester compound (A1) having a thioether bond in the molecule. When the ester compound (A) includes the ester compound (A1), an increase in the peroxide value described below can be suppressed, while tar cleaning properties can be improved and low smoke generation can be achieved.

[0017] Specific examples of the ester compound (A1) having a thioether bond in the molecule include dioctylthiodipropionate, diisolaurylthiodipropionate, dilaurylthiodipropionate, diisopalmitylthiodipropionate, diisostearylthiodipropionate, dioleylthiodipropionate, diisotetracosylthiodipropionate, di(2-decyl-1-tetradecanol)thiodipropionate, di(2-dodecyl-1-hexadecanol)thiodipropionate, di(2-octyl-1-decanol)thiodipropionate, 2-ethylhexyl (laurylthiopropionate), octylthiodipropionate, isolaurylthiodipropionate, laurylthiodipropionate, isopalmitylthiodipropionate, isostearylthiodipropionate, oleylthiodipropionate, and isotetracosylthiodipropionate.

[0018] Among the ester compounds (A1), preferably, thiodipropionic acid esters are included, more specifically, ester compounds formed by Guerbet alcohol having a carbon number of 24 to 32 and thiodipropionic acid. By including such ester compounds, particularly low smoke generation can be achieved.

[0019] The lower limit of the content of the ester compound (A1) in the treatment agent is preferably 0.5% by mass or more, more preferably 1% by mass or more. In addition, the upper limit of the content of the ester compound (A1) is preferably 30% by mass or less, more preferably 25% by mass or less, and particularly preferably 5% by mass or less. By limiting the range of the content, the effect of the present invention can be further improved. Among them, it can also be a range of any combination of the above upper and lower limits.

[0020] In addition, the ester compound (A) is preferably a complete ester compound (A2) formed by a trivalent or higher and tetravalent or lower polyol and a fatty acid. When the ester compound (A) includes the ester compound (A2), low smoke generation can be achieved.

[0021] Specific examples of the trivalent or higher and tetravalent or lower polyols as the raw material of the complete ester compound (A2) include glycerin, pentaerythritol, trimethylolpropane, 2-methyl-2-hydroxymethyl-1,3-propanediol, 1,2,3-butanetriol, 1,2,4-butanetriol, butanetetrol, 1,2,3-pentanetriol, and 1,2,4-pentanetriol.

[0022] The fatty acid as the raw material of the complete ester compound (A2) can be appropriately used from known sources, and can be a saturated fatty acid or an unsaturated fatty acid. In addition, it can be a straight chain or a branched chain. In addition, it can be a monobasic fatty acid or a polybasic acid. Specific examples of fatty acids include (1) straight-chain alkyl fatty 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, heneicosanoic acid, docosanoic acid, and tetracosanoic acid; (2) branched-chain alkyl fatty acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, and isooctadecanoic acid; (3) straight-chain alkenyl fatty acids such as crotonic acid, myristic acid, palmitoleic acid, oleic acid, tallow acid, eicosenoic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidic acid; and (4) naturally derived fatty acids such as castor oil fatty acid, sesame oil fatty acid, rosin oil fatty acid, soybean oil fatty acid, rapeseed oil fatty acid, palm oil fatty acid, palm kernel fatty acid, and coconut oil fatty acid.

[0023] Specific examples of the complete ester compound (A2) include, for example, glycerol trioleate, trimethylolpropane trilaurate, pentaerythritol tetracaprylate, triester formed by trimethylolpropane and a mixed acid (a mixture of palm kernel fatty acid and vegetable oleic acid), triester formed by trimethylolpropane and rapeseed oil fatty acid, triester formed by trimethylolpropane and coconut oil fatty acid, tetraester formed by pentaerythritol and palm oil fatty acid, coconut oil, rapeseed oil, sunflower seed oil, soybean oil, castor oil, sesame oil, and animal and plant oils such as fish oil.

[0024] The lower limit of the content of the complete ester compound (A2) in the treatment agent is preferably 10% by mass or more, more preferably 20% by mass or more. In addition, the upper limit of the content of the complete ester compound (A2) is preferably 70% by mass or less, more preferably 60% by mass or less. By limiting the content to the range, low smoke generation can be achieved. Among them, the range of any combination of the upper and lower limits can also be used.

[0025] Specific examples of the ester compound (A) other than the above-mentioned ester compound (A1) and the complete ester compound (A2) include, for example, (1) ester compounds formed by an aliphatic monohydric alcohol such as butyl stearate, octyl stearate, oleyl laurate, oleyl oleate, isopentadecyl isostearate, octyl palmitate, oleyl erucate, isotridecyl stearate and an aliphatic monocarboxylic acid, and ester compounds formed by aliphatic monocarboxylic acid and a (poly)oxyalkylene adducts obtained by adding an alkylene oxide having 2 to 4 carbon atoms to an aliphatic monohydric alcohol; ; (2) ester compounds formed by aliphatic polyols such as 1,6-hexanediol didecyl and aliphatic monocarboxylic acids, and complete ester compounds formed by (poly)oxyalkylene adducts formed by adding alkylene oxides having 2 to 4 carbon atoms to aliphatic polyols and aliphatic monocarboxylic acids; (3) complete ester compounds formed by aliphatic monohydric alcohols such as dilauryl adipate, dioleyl adipate, dioleyl azelaic acid, and dipolyoxyethylene lauryl adipate and aliphatic polycarboxylic acids, and complete ester compounds formed by (poly)oxyalkylene adducts formed by adding alkylene oxides having 2 to 4 carbon atoms to aliphatic polyols and aliphatic monocarboxylic acids; (4) ester compounds formed by aromatic monohydric alcohols such as benzyl oleate, benzyl laurate and polyoxypropylene benzyl stearate and aliphatic monocarboxylic acids, and ester compounds formed by (poly) oxyalkylene adducts formed by adding alkylene oxide having 2 to 4 carbon atoms to aromatic monohydric alcohols and aliphatic monocarboxylic acids; (5) complete ester compounds formed by aromatic polyhydric alcohols such as bisphenol A dilaurate and polyoxyethylene bisphenol A dilaurate and aliphatic monocarboxylic acids; (6) complete ester compounds formed by aliphatic monocarboxylic acids and aliphatic monoester compounds; (7) complete ester compounds formed by aliphatic monohydric alcohols such as bis-2-ethylhexyl phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polyhydric carboxylic acids; (8) complete ester compounds formed by aliphatic monohydric alcohols such as bis-2-ethylhexyl phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polyhydric carboxylic acids; (9) complete ester compounds formed by aliphatic monohydric alcohols such as bis-2-ethylhexyl phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polyhydric carboxylic acids; (10) complete ester compounds formed by aliphatic monohydric alcohols such as bis-2-ethylhexyl phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polyhydric carboxylic acids;

[0026] As the ester compound (A), one type of ester compound may be used alone, or two or more types of ester compounds may be used in appropriate combination. The lower limit of the content of the ester compound (A) in the treatment agent is preferably 25% by mass or more, more preferably 30% by mass or more. When the content is 25% by mass or more, the smoothness of the fiber imparted by the treatment agent can be further improved. The upper limit of the content of the ester compound (A) is preferably 80% by mass or less, more preferably 70% by mass or less. When the content is 80% by mass or less, the stability of the treatment agent can be further improved. The range may also be any combination of the above upper and lower limits.

[0027] (Other smoothing agents) In order to improve the smoothness of synthetic fibers, the treatment agent may contain other smoothing agents other than the ester compound (A) within the range that does not impair the effects of the present invention. Such smoothing agents include, for example, mineral oil (kinematic viscosity at 40°C is 5 mm 2 / s and above), polyolefins, etc.

[0028] Examples of the mineral oil include aromatic hydrocarbons, paraffinic hydrocarbons, and naphthenic hydrocarbons, and more specifically, include spindle oil and liquid paraffin.

[0029] Polyolefins that can be used as smoothing components include poly-α-olefins. Specific examples of polyolefins include poly-α-olefins obtained by polymerizing 1-butene, 1-hexene, 1-decene, etc. Commercially available poly-α-olefins can be used as appropriate.

[0030] (Ionic surfactant (B)) The treatment agent may further contain an ionic surfactant (B). By including an ionic surfactant (B) in the treatment agent, the tar cleaning property can be further improved. The ionic surfactant (B) can be appropriately used from known sources. Examples of the ionic surfactant (B) include anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0031] Anionic surfactants may be appropriately used from known sources. Specific examples of anionic surfactants include (1) phosphates of fatty alcohols such as lauryl phosphate, cetyl phosphate, octyl phosphate, oleyl phosphate, and stearyl phosphate; (2) phosphates of fatty alcohols such as polyoxyethylene lauryl ether phosphate, polyoxyethylene oleyl ether phosphate, and polyoxyethylene stearyl ether phosphate, which are obtained by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to fatty alcohols; (3) aliphatic sulfonates or aromatic sulfonates such as lauryl sulfonates, myristyl sulfonates, cetyl sulfonates, oleyl sulfonates, stearyl sulfonates, tetradecyl sulfonates, dodecylbenzene sulfonates, secondary alkyl sulfonic acid (carbon number 13 to 15), secondary alkyl sulfonic acid (carbon number 11 to 14), and α-olefin sulfonates; (4) fatty acids such as lauryl sulfate, oleyl sulfate, and stearyl sulfate; Sulfates of fatty alcohols; (5) Sulfates of fatty alcohols obtained by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to polyoxyethylene lauryl ether sulfates, polyoxyalkylene (polyoxyethylene, polyoxypropylene) lauryl ether sulfates, polyoxyethylene oleyl ether sulfates, etc.; (6) Sulfates of fatty acids derived from nature, such as castor oil fatty acid sulfates, sesame oil fatty acid sulfates, rosin oil fatty acid sulfates, soybean oil fatty acid sulfates, rapeseed oil fatty acid sulfates, and palm oil fatty acid sulfates; (7) Sulfates of natural oils and fats, such as castor oil sulfates, sesame oil sulfates, rosin oil sulfates, soybean oil sulfates, rapeseed oil sulfates, and palm oil sulfates; (8) Fatty acid salts, such as laurates, oleates, and stearates; (9) Sulfosuccinates of fatty alcohols, such as dioctyl sulfosuccinate, etc. Examples of the counter ion of the anionic surfactant include alkali metal salts such as potassium salts and sodium salts, ammonium salts, triethanolamine salts, (poly)oxyalkylenealkylamine salts, and alkanolamine salts such as dibutylethanolamine salts.

[0032] From the viewpoint of improving the tar cleaning property, the anionic surfactant preferably includes a sulfonic acid compound (B1) such as an aliphatic sulfonate. When the anionic surfactant includes a sulfonic acid compound (B1), the ester compound (A) is preferably a thiodipropionic acid ester, more specifically, an ester compound of a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid. This configuration can further enhance the effects of the present invention.

[0033] The lower limit of the content of the sulfonic acid compound (B1) in the treatment agent is preferably 0.1% by mass or more, more preferably 0.5% by mass or more. In addition, the upper limit of the content of the sulfonic acid compound (B1) is preferably 5% by mass or less, more preferably 3.5% by mass or less. By limiting the content to the range of the ratio, the tar cleaning property can be further improved. Among them, it can also be a range of any combination of the upper and lower limits mentioned above.

[0034] Specific examples of the cationic surfactant include lauryl trimethylammonium chloride, cetyl trimethylammonium chloride, stearyl trimethylammonium chloride, behenyl trimethylammonium chloride, didecyl dimethylammonium chloride, and the like.

[0035] Specific examples of the amphoteric surfactant include betaine-type amphoteric surfactants, etc. As the ionic surfactant (B), one type of ionic surfactant may be used alone, or two or more types of ionic surfactants may be used in combination as appropriate.

[0036] The lower limit of the content of the ionic surfactant (B) in the treatment agent is preferably 0.1% by mass or more, more preferably 1% by mass or more. The upper limit of the content of the ionic surfactant (B) is preferably 10% by mass or less, more preferably 6% by mass or less. By limiting the content to the range of the ratio, the tar cleaning performance can be further improved. Among them, it can also be a range of any combination of the upper and lower limits mentioned above.

[0037] (Nonionic surfactant (C)) The treatment agent may further contain a nonionic surfactant (C). By including a nonionic surfactant (C) in the treatment agent, the stability of the appearance of the treatment agent can be improved, and the diluent when applying the synthetic fiber can also be water and / or organic solvents with different polarities.

[0038] Examples of the nonionic surfactant (C) include compounds having a (poly)oxyalkylene structure formed by adding alkylene oxide to alcohols or carboxylic acids, ether-ester compounds having a (poly)oxyalkylene structure formed by adding alkylene oxide to ester compounds formed by carboxylic acids and polyols, compounds formed by adding alkylene oxide to natural oils and fats or compounds formed by esterification of such compounds with carboxylic acids, compounds (C1) having a (poly)oxyalkylene structure formed by adding alkylene oxide to amine compounds such as primary organic amines, compounds having a (poly)oxyalkylene structure formed by adding alkylene oxide to fatty acid amides, amide compounds formed by condensation of amine compounds and carboxylic acids, partial ester compounds formed by carboxylic acids and polyols, etc. Among these, compounds (C1) formed by adding alkylene oxide to primary organic amines are preferred from the viewpoint of further improving the tar cleaning performance.

[0039] Specific examples of alcohols used as raw materials for the nonionic surfactant (C) include, for example, (1) straight-chain alkanols such as methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, and triacontanol; (2) isopropanol, isobutyl alcohol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isotridecanol, isotetradecanol, (i) branched alkanols such as isopentadecyl alcohol, isohexadecanol, isohexadecanol, isoheptadecanol, isooctadecanol, isonadecanol, isoeicosanol, isoheneicosanol, isodocosanol, isotricosanol, isotetracosanol, isopentacosanol, isohexadecanol, isohexadecanol, isohexadecanol, isoctacosanol, isononadecanol and isotriacontanol; (2) straight-chain alkanols such as tetradecanol, hexadecanol, heptadecanol, octadecanol and nonadecanol; (3) branched alkanols such as isohexadecanol and isohexadecanol; (4) branched alkanols such as isohexadecanol and isooctadecanol; (5) cyclic alkanols such as cyclopentanol and cyclohexanol; (6) aromatic alcohols such as phenol, nonylphenol, benzyl alcohol, monostyrenated phenol, distyrenated phenol and tristyrenated phenol.

[0040] Specific examples of carboxylic acids used as raw materials for the nonionic surfactant (C) include, for example, (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, heneicosanoic 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 octadecatrienoic acid; (4) aromatic carboxylic acids such as benzoic acid; and (5) hydroxycarboxylic acids such as ricinoleic acid.

[0041] The alkylene oxide used as the raw material for forming the (poly)oxyalkylene structure of the nonionic surfactant (C) is preferably an alkylene oxide having a carbon number of 2 or more and 4 or less. Specific examples of alkylene oxides include ethylene oxide, propylene oxide, butylene oxide, etc. The number of moles of alkylene oxide added can be appropriately set, preferably 0.1 mole 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 a range of any combination of the above upper and lower limits. Among them, the number of moles of alkylene oxide added represents the number of moles of alkylene oxide relative to 1 mole of the addition object compound in the loaded raw material. Alkylene oxide can use one type of alkylene oxide alone, or two or more types of alkylene oxides can be used in appropriate combination. When two or more types of alkylene oxides are applicable, the addition methods can be block addition, random addition, and a combination of block addition and random addition, without special restrictions.

[0042] Specific examples of the polyhydric alcohol used as a raw material for the nonionic surfactant (C) 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, diglycerol, 2-methyl-2-hydroxymethyl-1,3-propanediol, trimethylolpropane, sorbitan, pentaerythritol, sorbitol, and the like.

[0043] Specific examples of the aliphatic amine or primary organic amine used as a raw material of the nonionic surfactant (C) include methylamine, ethylamine, butylamine, octylamine, laurylamine, octadecylamine (stearylamine), octadecylamine, coconut amine and the like.

[0044] Specific examples of the fatty acid amide used as a raw material of the nonionic surfactant (C) include caprylic acid amide, lauric acid amide, palmitic acid amide, stearic acid amide, oleic acid amide, ceramide, and wood wax amide.

[0045] Specific examples of the compound (C1) formed by adding alkylene oxide to a primary organic amine include, for example, 3 mol of ethylene oxide (hereinafter referred to as EO) added to 1 mol of laurylamine, 10 mol of EO added to 1 mol of laurylamine, 10 mol of EO added to 1 mol of stearylamine, 15 mol of EO added to 1 mol of stearylamine, etc. The number of moles of alkylene oxide added to the compound (C1) can be appropriately set, preferably 1 mol or more and 25 mol or less, more preferably 3 mol or more and 20 mol or less. It can also be a range of any combination of the above upper and lower limits.

[0046] The lower limit of the content ratio of the compound (C1) formed by adding alkylene oxide to a primary organic amine in the treatment agent is preferably 0.1% by mass or more, and more preferably 1% by mass or more. The upper limit of the content ratio of the compound (C1) is preferably 10% by mass or less, and more preferably 5% by mass or less. By limiting the range of the content ratio, the tar cleaning property can be further improved. Among them, it can also be a range of any combination of the above upper and lower limits.

[0047] Specific examples of the nonionic surfactant (C) other than the above include a compound obtained by adding 10 mol of EO to 1 mol of stearyl alcohol, a compound obtained by adding 10 mol of EO to 1 mol of isotridecanol, a compound obtained by randomly adding 10 mol of EO and 10 mol of propylene oxide (hereinafter referred to as PO) to 1 mol of isotridecanol, a compound obtained by adding 10 mol of EO to 1 mol of hydrogenated castor oil, a compound obtained by adding 20 mol of EO to 1 mol of hydrogenated castor oil and then esterifying the mixture with 3 mol of oleic acid, a compound obtained by adding 25 mol of EO to 1 mol of hydrogenated castor oil, crosslinking the mixture with adipic acid, and then terminally esterifying the mixture with stearic acid (mass average molecular weight 5000), sorbitan monolaurate, sorbitan trioleate and 1 mol of EO 10 mol, ester formed by 1 mol of diglycerol and 2 mol of isostearic acid, diester formed by polyethylene glycol (mass average molecular weight 600) and lauric acid, diester formed by polyethylene glycol (mass average molecular weight 600) and oleic acid, oleyl diethanolamide, etc.

[0048] As the nonionic surfactant (C), one type of nonionic surfactant may be used alone, or two or more types of nonionic surfactants may be used in appropriate combination. In the treatment agent, the lower limit of the content ratio of the nonionic surfactant (C) is preferably 20% by mass or more, more preferably 25% by mass or more. The upper limit of the content ratio of the nonionic surfactant (C) is preferably 70% by mass or less, more preferably 65% ​​by mass or less. By limiting the range of the content ratio, the stability of the appearance of the treatment agent can be improved, and the diluent when applying the synthetic fiber can also be used, water and / or organic solvents with different polarities. Among them, it can also be a range of any combination of the above upper and lower limits.

[0049] When the total content of the smoothing agent (A), the ionic surfactant (B), and the nonionic surfactant is set to 100 mass %, the synthetic fiber treatment agent of the present invention preferably contains 15 mass % or more and 80 mass % or less of the smoothing agent (A), 0.1 mass % or more and 15 mass % or less of the ionic surfactant (B), and 15 mass % or more and 80 mass % or less of the nonionic surfactant (C). By limiting to this range, the effect of the present invention can be further improved.

[0050] (Peroxide Value) The peroxide value detected from the treatment agent is 100 meq / kg or less, preferably 50 meq / kg or less, and more preferably 20 meq / kg or less. The peroxide value will increase during storage, but even if it exceeds 0 meq / kg, as long as it is within this range, the tar cleaning property can be improved and low smoke generation can be achieved. Among them, the peroxide value in the treatment agent can be determined by using potentiometric titration according to the determination method (peroxide value (chloroform method)) of the "Benchmark Oil and Fats Analysis Test Method" formulated by the Japan Oil Chemicals Association.

[0051] (Method for producing treatment agent) The treatment agent is filled in the product container after mixing the above-mentioned components. From the viewpoint of suppressing the peroxide value, the raw materials of the treatment agent are preferably stored at 80°C or less, more preferably at 10°C or more and 50°C or less, and most preferably at 20°C or more and 30°C or less. The filling rate of the treatment agent in the product container is preferably limited to a range of 60% by volume or more and 100% by volume or less of the filling rate calculated from the following formula (1) at 25°C under atmospheric pressure.

[0052] [Number 2]

[0053] By limiting to this range, the oxygen contacted by the treatment agent can be reduced, thereby suppressing the increase of the peroxide value, improving the tar cleaning property and achieving low smoke. In addition, the filling temperature of the treatment agent for the product container is preferably 20°C or more and 80°C or less, and more preferably 50°C or less. When the filling temperature is above 20°C, the viscosity of the treatment agent can be reduced to speed up the filling speed of the treatment agent, thereby improving the usability. In addition, when the filling temperature is below 80°C, the reaction between oxygen and the treatment agent can be reduced to suppress the increase of the peroxide value. In addition, from the viewpoint of suppressing the increase of the peroxide value, the storage temperature of the treatment agent filled in the product container is preferably 80°C or less, more preferably 10°C or more and 50°C or less, and most preferably 20°C or more and 30°C or less. The treatment agent is preferably adjusted to a temperature suitable for each treatment agent before use. In addition, when the treatment agent is filled into the product container, from the viewpoint of avoiding contact with oxygen and suppressing the increase of the peroxide value, it is preferably a method of using nitrogen pressure delivery or a pump.

[0054] The gas-liquid contact area / volume of the treatment agent in the product container is preferably 0 [1 / cm] or more and 0.1 [1 / cm] or less (25° C.). By limiting the range to this, the contact between the treatment agent and oxygen can be reduced, thereby suppressing the increase in the peroxide value.

[0055] (other) The concentration of Cu ions in the treatment agent is preferably 50 ppm or less, more preferably 10 ppm or less, further preferably 5 ppm or less, and most preferably 1 ppm or less. By limiting the concentration to this level, an increase in smoke after long-term storage can be suppressed.

[0056] The concentration of Fe ions in the treatment agent is preferably 50 ppm or less, more preferably 10 ppm or less, further preferably 5 ppm or less, and most preferably 1 ppm or less. By limiting the concentration to this level, an increase in smoke after long-term storage can be suppressed.

[0057] In order to suppress the increase of Cu ions and Fe ions in the treatment agent, it is preferred to use aluminum, stainless steel, ceramic, fluororesin, or glass utensils or devices in the steps of synthesis, storage, transfer, mixing, neutralization, dissolution, filtration, purification, etc. of the product. In addition, the raw material or the treatment agent may also be subjected to adsorption treatment, crystallization treatment, etc. using ion exchange method, inorganic adsorbent, etc. Among them, the concentration of Cu ions and Fe ions in the treatment agent can be obtained by ICP emission analysis.

[0058] Furthermore, the treatment agent may also be mixed with metal deactivators such as benzotriazole, dialkylthiol thiadiazole, citric acid, tartaric acid, ascorbic acid, and amino acids as other components.

[0059] In addition, the iodine value (IV) of the treatment agent is preferably greater than 10 meq / kg and less than 60 meq / kg. When the iodine value (IV) is greater than 10 meq / kg, the melting point of the treatment agent can be lowered, thereby improving the stability at low temperatures, so there is no need to store the treatment agent at high temperatures. In addition, the usability of the treatment agent can be improved. When the iodine value (IV) is less than 60 meq / kg, the increase in the peroxide value can be suppressed. In addition, post-processing problems such as poor relaxation caused by the deterioration of the treatment agent attached to the yarn can also be solved. Among them, the iodine value (IV) in the treatment agent can be measured according to the measurement method (iodine value (Wei-Cyclohexane method)) of the "Benchmark Oil and Fats Analysis Test Method" formulated by the Japan Oil Chemicals Association.

[0060] In addition, during or after the preparation of the treatment agent, a light stabilizer, a phenolic antioxidant, or other free radical catching agent may be mixed. From the viewpoint of suppressing the fuming of the added compound itself, the molecular weight of the light stabilizer or free radical catching agent is preferably 300 g / mol or more, more preferably 450 g / mol or more, and most preferably 600 g / mol or more. The amount of other components used may be limited to the range that does not impair the effect of the present invention.

[0061] <Second embodiment> Next, the second embodiment that concretizes the synthetic fiber of the present invention is described. The synthetic fiber of this embodiment is attached with the treatment agent of the first embodiment. When the treatment agent is attached to the synthetic fiber, the treatment agent may also be a diluent diluted with a diluent solvent, such as an organic solvent solution, an aqueous liquid, etc. From the viewpoint of the adhesion and economy of the treatment agent to the fiber, the diluent solvent is preferably a hydrocarbon with a carbon number of 10 or more and 15 or less and / or water. The diluent such as an aqueous liquid can be attached to the synthetic fiber in, for example, a spinning or stretching step. The diluent attached to the synthetic fiber can also evaporate the diluent solvent in the stretching step or the drying step. There is no particular limitation on the step of attaching the diluent as long as it is performed in the spinning step. By using it in a manufacturing equipment or process having a step of passing through a roller above 150°C in the stretching or heat treatment step, the effect of the invention can be expected more.

[0062] Specific examples of synthetic fibers to which the treatment agent of the present embodiment is applied are not particularly limited, and examples thereof include (1) polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polylactic acid, and composite fibers containing these polyester resins; (2) polyamide fibers such as nylon 6 and nylon 66; (3) polyacrylic acid fibers such as polyacrylic acid and modified acrylic acid; (4) polyolefin fibers such as polyethylene and polypropylene. Among these, polyester fibers and polyamide fibers are preferably used.

[0063] The proportion of the treatment agent attached to the synthetic fiber is not particularly limited, and it is preferred that the treatment agent is attached at a ratio of 0.1% by mass to 3% by mass (excluding the ratio of solvents such as water) relative to the synthetic fiber. According to this configuration, the effect of the present invention can be further improved. In addition, the method for attaching the treatment agent is not particularly limited, and a known method such as a drum oiling method, a guided oiling method using a metering pump, an immersion oiling method, a spray oiling method, etc. can be used.

[0064] The use of the synthetic fiber in the present invention is not particularly limited, and preferably the synthetic fiber can be used for industrial materials. More preferably, it is a synthetic fiber used in the fields of automobiles, construction, commerce, agriculture, aquaculture, civil engineering, etc., such as fibers for airbags, fibers for seat belts, fibers for tire cords, fibers for carpets, fibers for tents, fibers for advertising cloths, fibers for fishing nets, fibers for conveyor belts, fibers for ropes, etc.

[0065] The effects of the treatment agent and the synthetic fiber according to the above-described embodiment will be described. (1-1) The treatment agent of the above embodiment is mixed with an ester compound (A), and the peroxide value detected from the treatment agent is limited to 100 meq / kg or less. Therefore, the tar cleaning property can be improved and low smoke generation can be achieved. In particular, even when the treatment agent is stored for a long time, the deterioration of the components in the treatment agent can be suppressed, and the tar cleaning property and low smoke generation can be maintained after long-term storage.

[0066] <Reference Embodiment 1> The following describes the antioxidant according to Reference Embodiment 1. The following description will focus on the differences from the above-mentioned treatment agent.

[0067] The antioxidant of the present embodiment contains a thiodipropionate, more specifically, an ester compound formed by Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, and is an antioxidant to be mixed with a treatment agent. The antioxidant of the present embodiment can also be applied to an antioxidant method for a treatment agent, which comprises mixing a thiodipropionate, more specifically, an ester compound formed by Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, with a treatment agent.

[0068] The effects of the antioxidant according to the above-described embodiment will be described. (2-1) The antioxidant of the present embodiment is used to be mixed with the treatment agent, and contains a thiodipropionic acid ester, more specifically, an ester compound formed by Guerbet alcohol having a carbon number of 24 or more and 32 or less and thiodipropionic acid. Therefore, the long-term storage stability of the treatment agent can be improved. In addition, the process or disposal such as filling nitrogen into the product container to inhibit the reaction between oxygen and the treatment agent can be eliminated, thereby seeking to improve the working efficiency. In addition, it is not necessary to store the treatment agent in a low temperature environment, thereby improving the operability of the product.

[0069] In particular, when the treatment agent contains vegetable oil or fish oil whose components are easily degraded by oxidation, the deterioration of the components can be suppressed, thereby maintaining the function of the smoothing agent. <Reference Embodiment 2> The following description will focus on the anti-smoking agent according to the reference embodiment 2. The following description will focus on the differences from the above-mentioned treatment agent.

[0070] The anti-smoking agent of the present embodiment contains a thiodipropionate, more specifically, an ester compound formed by Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, and is an anti-smoking agent used in a fiber stretching step. In addition, the anti-smoking agent of the present embodiment can also be applied to a smoke prevention method, which is to impart a thiodipropionate, more specifically, an ester compound formed by Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, to a fiber before a stretching step.

[0071] The effects of the anti-smoking agent of the above-mentioned embodiment will be described. (3-1) The anti-smoking agent of this embodiment is used to be mixed with a treatment agent, and contains a thiodipropionic acid ester, more specifically, an ester compound formed by Guerbet alcohol having a carbon number of 24 or more and 32 or less and thiodipropionic acid. Therefore, it is possible to reduce smoke while exerting a smoothness function, especially in the step of passing through a heating roller that easily generates smoke. The ester compound contained in the anti-smoking agent is unlikely to generate low molecular weight decomposition products that are easily decomposed during long-term storage or thermally decomposed during spinning and easily cause smoke.

[0072] The above-mentioned embodiment can also be modified as follows: The above-mentioned embodiment and the following modified examples can be combined with each other within the scope of no technical contradiction. The treatment agent of the above embodiment may be further mixed with components commonly used in treatment agents, such as stabilizers, antistatic agents, linkers, antioxidants, ultraviolet absorbers, defoamers, preservatives, and rust inhibitors, during or after the production of the treatment agent to maintain the quality of the treatment agent, without impairing the effects of the present invention.

[0073] The treatment agent of the above embodiment does not necessarily contain the above ionic surfactant (B) and nonionic surfactant (C). In addition, the treatment agent may contain both the ionic surfactant (B) and the nonionic surfactant (C), or may contain either the ionic surfactant (B) or the nonionic surfactant (C). Example

[0074] In order to more specifically explain the constitution and effects of the present invention, examples are given below, but the present invention is not limited to these examples. In the following examples and comparative examples, unless otherwise specified, parts represent parts by mass, and % represents mass %.

[0075] Test Category 1 (Preparation of treatment agent) (Example 1) The treatment agent of Example 1 was prepared, which contained 5 parts (%) of di(2-decyl-1-tetradecanol)thiodipropionate (A1-1) as the ester compound (A) as shown in Table 1, 30 parts (%) of triester of trimethylolpropane and a mixed acid (A2-1), 0.5 parts (%) of secondary alkanesulfonic acid sodium salt (B1-1) as the ionic surfactant (B), 1 part (%) of oleyl phosphate ester-dibutylethanolamine salt (B2-2), 2.5 parts (%) of a product obtained by adding 10 mol of EO to 1 mol of lauryl amine (C1-2) as the nonionic surfactant (C), 10 parts (%) of a product obtained by adding 10 mol of EO to 1 mol of stearyl alcohol (C2-1), 20 parts (%) of a product obtained by randomly adding 10 mol of EO and 10 mol of PO to 1 mol of isotridecanol (C2-3), 10 parts (%) of a product obtained by randomly adding 10 mol of EO to 1 mol of hardened castor oil (C2-4), and 10 parts (%) of a product obtained by randomly adding 10 mol of EO to 1 mol of stearyl alcohol. 20 parts (%) of a compound (C2-5) obtained by esterifying 20 mol of oleic acid with 3 mol of oleic acid, 5 parts (%) of sorbitan monolaurate (C2-7), 5 parts (%) of a diester (C2-11) formed by polyethylene glycol (mass average molecular weight 600) and oleic acid, and 1 part (%) of 4,4'-butylenebis(6-tert-butyl-m-cresol) (D1-2) as other component (D).

[0076] The ester compound in Example 1 was stored in a polyethylene container at 25° C. at a filling rate of 90% by volume and a gas-liquid contact area / treatment agent volume of 0.07 [1 / cm], and it had not yet been 2 weeks since the synthesis.

[0077] Compounds other than the ester compound were stored in a polyethylene container at 25° C. at a filling rate of 90% by volume and a gas-liquid contact area / treatment agent volume of 0.07 [1 / cm] within 2 weeks after synthesis.

[0078] In addition, each raw material compound was adjusted to 40° C. in a water bath, and then a treatment agent was prepared under a nitrogen atmosphere. (Examples 2 to 14, Comparative Examples 1 to 4) The treatment agents of Examples 2 to 14 and Comparative Examples 1 to 4 were prepared in the same manner as the treatment agent of Example 1, and contained an ester compound (A), an ionic surfactant (B), a nonionic surfactant (C), and other components (D) in the proportions shown in Table 1.

[0079] The ester compounds in Examples 7, 9, 10, and 14 were placed in a glass beaker (inner diameter 4.5 cm) so that the gas-liquid contact area / volume was 0.25 [1 / cm] and stored at 70° C. for 2 weeks.

[0080] The ester compounds used in the examples other than the above were stored in a polyethylene container at 25°C with a filling rate of 90% by volume and a gas-liquid contact area / treatment agent volume of 0.07 [1 / cm] and were used within 2 weeks after synthesis.

[0081] The ester compound used in Comparative Example 1 was placed in a glass beaker (inner diameter 4.5 cm) so that its gas-liquid contact area / volume=0.25 [1 / cm] and stored at 70°C for 4 weeks.

[0082] In Comparative Example 2, the ester compound just synthesized was used, and the prepared treatment agent was placed in a glass beaker (inner diameter 4.5 cm) so that the gas-liquid contact area / volume = 0.5, and stored at 70°C for 6 weeks.

[0083] Compounds other than the ester compound were stored in a polyethylene container at 25° C. at a filling rate of 90% by volume and a gas-liquid contact area / treatment agent volume of 0.07 [1 / cm] within 2 weeks after synthesis.

[0084] In addition, each raw material compound was adjusted to 40° C. in a water bath, and then a treatment agent was prepared under a nitrogen atmosphere. The type and content of the ester compound (A), the type and content of the ionic surfactant (B), the type and content of the nonionic surfactant (C), and the type and content of other components (D) are shown in the "Ester compound (A)" column, "Ionic surfactant (B)" column, "Nonionic surfactant (C)" column, and "Other components (D)" column of Table 1, respectively.

[0085] The peroxide value in each treatment agent was measured using potentiometric titration according to the measurement method (peroxide value (chloroform method)) of the "Standard Oil and Fats Analysis Test Method" established by the Japan Oil Chemicals Society. The peroxide value of the treatment agent is shown in the "Peroxide Value" column of Table 1.

[0086] The iodine value (IV) in each treatment agent was measured according to the measurement method (iodine value (Weiger-cyclohexane method)) of the "Standard Oil and Fats Analysis Test Method" established by the Japan Oil Chemists' Association. The iodine value (IV) of the treatment agent is shown in the "Iodine value" column of Table 1.

[0087] The Fe and Cu in all the prepared treatment agents were measured by ICP-AES and confirmed to be 1 ppm or less. ICP-AES was performed using ICPE-9000 (manufactured by Shimadzu Corporation) to analyze a solution of 0.5 g of a sample diluted with ultrapure water to make 100 mL.

[0088] [Table 1]

[0089] The details of the ester compound (A), the ionic surfactant (B), the nonionic surfactant (C), and other components (D) described in Table 1 are as follows. <Ester compound (A)> (Ester compound (A1) having a thioether bond in the molecule) A1-1: Di(2-decyl-1-tetradecanol)thiodipropionate A1-2: Di(2-dodecyl-1-hexadecanol)thiodipropionate A1-3: Dioleyl thiodipropionate A1-4: Di(2-octyl-1-decanol)thiodipropionate A1-5: 2-Ethylhexyl (laurylthiopropionate) (Complete ester compound (A2) formed by a trivalent or higher and tetravalent or lower polyol and a fatty acid) A2-1: Trimethylolpropane and mixed acid (palm kernel fatty acid and vegetable oleic acid, mass ratio 4:6 mixture) A2-2: Rapeseed Oil (Other ester compounds (A)) A3-1: Dioleyl adipate A3-2: Oleyl erucate (Other smoothing agents) rA-1: Mineral oil (40mPa·s at 40℃) <Ionic surfactant (B)> (Sulfonic acid compound (B1)) B1-1: Secondary alkanesulfonic acid sodium salt (C = 11 or more and 14 or less) B1-2: Dioctyl sulfosuccinate sodium salt B1-3: α-olefin sulfonic acid sodium salt (Other ionic surfactants (B)) B2-1: Potassium oleate B2-2: Oleyl phosphate-dibutylethanolamine salt B2-3: Isocetyl phosphate-triethanolamine salt <Nonionic surfactant (C)> (Compound (C1) obtained by adding alkylene oxide to a primary organic amine) C1-1: 1 mol of p-laurylamine plus 3 mol of EO C1-2: 10 moles of EO added to 1 mole of p-laurylamine C1-3: 10 moles of EO added to 1 mole of stearylamine C1-4: 15 mol of EO added to 1 mol of stearylamine (Other nonionic surfactants (C)) C2-1: 10 moles of EO added to 1 mole of stearyl alcohol C2-2: 10 moles of EO added to 1 mole of isotridecanol C2-3: randomly added 10 moles of EO and 10 moles of PO to 1 mole of isotridecanol C2-4: Addition of 10 mol of EO to 1 mol of hardened castor oil C2-5: Compound obtained by adding 20 mol of EO to 1 mol of hardened castor oil and then esterifying with 3 mol of oleic acid C2-6: A compound obtained by adding 25 mol of EO to 1 mol of hardened castor oil, crosslinking with adipic acid, and then terminal esterification with stearic acid (mass average molecular weight 5000) C2-7: Sorbitan monolaurate C2-8: Addition of 10 moles of EO to 1 mole of sorbitan trioleate C2-9: ester formed by 1 mol of diglycerol and 2 mol of isostearic acid C2-10: Diester of polyethylene glycol (mass average molecular weight 600) and lauric acid C2-11: Diester of polyethylene glycol (mass average molecular weight 600) and oleic acid C2-12: Oleyl diethanolamide <Other ingredients (D)> D1-1: Tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate D1-2: 4,4'-butylenebis(6-tert-butyl-m-cresol) D1-3: Tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate D1-4: 2,2'-methylenebis(4-ethyl-6-tert-butylphenol) Test category 2 (Evaluation of tar cleaning properties) Each newly prepared treatment agent is diluted with an organic solvent (a mixed solvent of hexane and ethanol) to make a 15% dilution of the treatment agent. The above dilution is applied to an oil-free polyethylene terephthalate fiber of 1000 dtex, 126 fi lament, and an inherent viscosity of 0.93 at a non-volatile content of 5.0% by the guided oiling method. It is brought into contact with a matte chrome needle with a surface temperature of 240°C and operated under the conditions of an initial tension of 1.5 kg and a yarn speed of 0.1 m / min. The brown tar attached to the running part of the fiber and its periphery is wiped at 180°C with a cotton stick impregnated with a glycerol solution prepared to 5% NaOH, and the number of times the brown tar disappears is measured. Tar cleaning properties are evaluated based on the following criteria. The results are shown in the "Tar Cleaning Properties" column of Table 1.

[0090] Evaluation criteria for tar cleaning performance ◎(Good): Less than 100 times ○ (Acceptable): 100 times or more and less than 200 times ×(Defective): 200 times or more Test Category 3 (Evaluation of smoke generation) Each prepared treatment agent is diluted evenly with ion exchange water or an organic solvent (mixed solvent of hexane and ethanol) as appropriate to obtain a 15% dilution of the treatment agent. The above dilution is applied to an oil-free polyethylene terephthalate fiber of 1000 dtex, 126 filament, and an inherent viscosity of 0.93 with a non-volatile component amount of 1.0% by the oiling drum method. The dilution is then dried to obtain a test yarn. The test yarn is brought into contact with a heating roller at 220°C at a yarn speed of 300 m / min, and the smoke observed around the heating roller is evaluated using the following criteria. The results are shown in the "Smoke" column of Table 1.

[0091] Evaluation criteria for smoke generation ◎(Good): No smoke was observed ○ (Acceptable): Slight smoke is observed × (bad): smoke is clearly observed As is clear from the results in Table 1, the treatment agents of each example are rated as acceptable in terms of tar detergency and smoke generation. According to the present invention, tar detergency can be improved and smoke generation can be reduced, particularly in the spinning step of synthetic fibers.

[0092] The present disclosure also includes the following aspects. (Appendix 1) A treating agent for synthetic fibers, which contains an ester compound (A) and is used in a spinning or stretching step, Features: The peroxide value detected from the synthetic fiber treating agent is 100 meq / kg or less.

[0093] (Appendix 2) The synthetic fiber treating agent as described in Appendix 1, wherein The peroxide value detected from the synthetic fiber treating agent is 50 meq / kg or less.

[0094] (Appendix 3) The synthetic fiber treating agent as described in Appendix 1, wherein The ester compound (A) includes an ester compound (A1) having a thioether bond in the molecule.

[0095] (Appendix 4) The synthetic fiber treating agent as described in Appendix 1, wherein The ester compound (A) includes a complete ester compound (A2) formed of a trivalent or higher and tetravalent or lower polyol and a fatty acid.

[0096] (Appendix 5) The synthetic fiber treating agent as described in Appendix 1, wherein Furthermore, it contains an ionic surfactant (B). (Appendix 6) The synthetic fiber treating agent as described in Appendix 5, wherein The above-mentioned ionic surfactant (B) contains a sulfonic acid compound (B1).

[0097] (Appendix 7) The synthetic fiber treating agent as described in Appendix 1, wherein Furthermore, it contains a nonionic surfactant (C). (Appendix 8) The synthetic fiber treating agent as described in Appendix 7, wherein The nonionic surfactant (C) includes a compound (C1) in which an alkylene oxide is added to a primary organic amine.

[0098] (Appendix 9) A synthetic fiber, characterized in that: The synthetic fiber treating agent described in any one of Appendixes 1 to 8 is attached.

[0099] (Appendix 10) A method for producing a synthetic fiber treatment agent, which produces the synthetic fiber treatment agent described in any one of Appendixes 1 to 8, characterized in that: The filling rate calculated from the following formula (1) at 25° C. under atmospheric pressure is set to 60% by volume or more and 100% by volume or less.

[0100] [Number 3]

[0101] (Appendix 11) A treatment agent for synthetic fibers, comprising an ester compound, characterized in that: The concentration of Cu ions and the concentration of Fe ions in the synthetic fiber treatment agent are each 50 ppm or less.

[0102] (Appendix 12) A treatment agent for synthetic fibers, characterized in that: Contains an ester compound of a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, and a sulfonic acid compound.

[0103] (Appendix 13) A treatment agent for synthetic fibers, comprising an ester compound, characterized in that: The peroxide value detected from the above synthetic fiber treatment agent is 100 meq / kg or less. It further contains a free radical scavenger or a metal deactivator.

[0104] (Appendix 14) A treatment agent for synthetic fibers, comprising an ester compound, characterized in that: The peroxide value detected from the above synthetic fiber treatment agent is 100 meq / kg or less. The iodine value is not less than 10 meq / kg and not more than 60 meq / kg.

[0105] (Appendix 15) A treatment agent for synthetic fibers, comprising an ester compound, characterized in that: The above ester compound includes thiodipropionate, The concentration of Cu ions and the concentration of Fe ions in the synthetic fiber treatment agent are each 50 ppm or less.

[0106] (Appendix 16) A synthetic fiber treatment agent comprising an ester compound (A), characterized in that: The above-mentioned ester compound (A) includes an ester compound (A1) having a thioether bond in the molecule, The synthetic fiber treatment agent contains the ester compound (A1) having a thioether bond in the molecule in a proportion of 0.5% by mass or more and 5% by mass or less, The concentration of Cu ions and the concentration of Fe ions in the synthetic fiber treatment agent are each 50 ppm or less.

Claims

1. A synthetic fiber treatment agent comprising an ester compound (A), characterized in that: The peroxide value detected from the synthetic fiber treating agent is 100 meq / kg or less.

2. The synthetic fiber treating agent according to claim 1, wherein The peroxide value detected from the synthetic fiber treating agent is 50 meq / kg or less.

3. The synthetic fiber treating agent according to claim 1, wherein The ester compound (A) includes an ester compound (A1) having a thioether bond in the molecule.

4. The synthetic fiber treating agent according to claim 1, wherein The ester compound (A) includes a complete ester compound (A2) formed of a trivalent or higher and tetravalent or lower polyol and a fatty acid.

5. The synthetic fiber treating agent according to claim 1, wherein Furthermore, it contains an ionic surfactant (B).

6. The synthetic fiber treating agent according to claim 5, wherein The above-mentioned ionic surfactant (B) contains a sulfonic acid compound (B1).

7. The synthetic fiber treating agent according to claim 1, wherein Furthermore, it contains a nonionic surfactant (C).

8. The synthetic fiber treating agent according to claim 7, wherein The nonionic surfactant (C) includes a compound (C1) in which an alkylene oxide is added to a primary organic amine.

9. A synthetic fiber, characterized in that: The synthetic fiber treating agent according to any one of claims 1 to 8 is attached thereto.

10. A method for producing a synthetic fiber treatment agent, comprising producing the synthetic fiber treatment agent according to any one of claims 1 to 8, characterized in that: The filling rate calculated from the following formula (1) at 25° C. under atmospheric pressure is set to 60% by volume or more and 100% by volume or less, [Number 1]

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