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 fibers, and a method for producing the synthetic fiber treatment agent. Background Art

[0002] For example, in the spinning and drawing steps of synthetic fibers, a fiber treatment agent may be applied to the surface of the fiber from the viewpoint of improving 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 that has undergone a heat treatment step containing a specific bisphenol A alkylene oxide adduct. Patent Document 2 discloses a synthetic fiber treatment agent that contains an ester compound formed by at least one selected from organic acids containing sulfur in the molecule and ester-forming derivatives of organic acids containing sulfur in the molecule and Guerbet alcohols having 6 to 22 carbon atoms. Patent Document 3 discloses a synthetic fiber treatment agent that 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 Laid-Open No. 2020-094304 Patent Document 3: Japanese Patent Application Laid-Open No. 2018-150665 Summary of the Invention Problems to be solved by the invention

[0004] However, conventional synthetic fiber treating agents are still being sought 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-mentioned problems and have found that, in a synthetic fiber treating agent, a configuration in which the peroxide value detected in 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 treating agent comprising an ester compound (A), wherein a peroxide value detected in the synthetic fiber treating 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) comprises 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). Aspect 6: The synthetic fiber processing agent according to aspect 5, wherein the ionic surfactant (B) contains a sulfonic acid compound (B1).

[0010] Aspect 7: The synthetic fiber processing agent according to any one of aspects 1 to 6, further comprising a nonionic surfactant (C). Aspect 8: The synthetic fiber processing agent according to aspect 7, wherein the nonionic surfactant (C) comprises a compound (C1) obtained by adding an alkylene oxide to a primary organic amine.

[0011] Aspect 9: A synthetic fiber, wherein the synthetic fiber treatment agent according to any one of aspects 1 to 8 is attached thereto. Method 10: A method for producing a treatment agent for synthetic fibers, wherein the method comprises producing the treatment agent for synthetic fibers described in any one of methods 1 to 8, 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, tar cleaning performance can be improved and low smoke generation can be achieved. DETAILED DESCRIPTION

[0014] <First embodiment> The first embodiment of the synthetic fiber treating agent (hereinafter referred to as the treating agent) of the present invention will be described below. The treating agent of this embodiment contains an ester compound (A), and the peroxide value detected in the treating 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 smoothing agent 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, as described later. The fatty acid used as the raw material of the ester compound is 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, a higher fatty acid, a fatty acid having a ring, or a fatty acid having an aromatic ring. The alcohol used as the raw material of the ester compound is 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, a higher alcohol, an alcohol having a ring, or an alcohol having an aromatic ring.

[0016] The ester compound (A) preferably includes an ester compound (A1) having a thioether bond in the molecule. By including the ester compound (A) (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), thiodipropionic acid esters are preferably included, more specifically, ester compounds formed from Guerbet alcohols having 24 to 32 carbon atoms and thiodipropionic acid. Inclusion of such ester compounds can further achieve particularly low smoke generation.

[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. Furthermore, 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 content to this range, the effects of the present invention can be further enhanced. Any combination of the upper and lower limits mentioned above is also acceptable.

[0020] Furthermore, the ester compound (A) is preferably a complete ester compound (A2) formed from a trivalent or higher and tetravalent 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 materials 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, butanethrol, 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 any known fatty acid as appropriate. It may be a saturated fatty acid or an unsaturated fatty acid. It may be a linear fatty acid or a branched fatty acid. It may be a monobasic fatty acid or a polybasic fatty 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 tetraoctanoate, 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 oil, soybean oil, castor oil, sesame oil, and animal and vegetable 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. Furthermore, 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 within this range, low smoke generation can be achieved. Any combination of the upper and lower limits mentioned above is also acceptable.

[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, isopentacosyl isostearate, octyl palmitate, oleyl erucate, isotridecyl stearate, and an aliphatic monocarboxylic acid; and ester compounds formed by a (poly)oxyalkylene adduct obtained by adding an alkylene oxide having 2 or more and 4 or less carbon atoms to an aliphatic monohydric alcohol and an aliphatic monocarboxylic acid. (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 oxide having 2 or more and 4 or less 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 oxide having 2 or more and 4 or less carbon atoms to aliphatic monohydric alcohols 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 or more and 4 or less 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. Ester compounds, complete ester compounds formed by (poly)oxyalkylene adducts formed by adding alkylene oxide having 2 or more and 4 or less carbon atoms to aromatic polyols and aliphatic monocarboxylic acids; (6) complete ester compounds formed by aliphatic monohydric alcohols such as bis-2-ethylhexyl phthalate, diisostearyl isophthalate, trioctyl trimellitate and aromatic polycarboxylic acids, complete ester compounds formed by (poly)oxyalkylene adducts formed by adding alkylene oxide having 2 or more and 4 or less carbon atoms to aliphatic monohydric alcohols and aromatic polycarboxylic acids, etc.

[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 combination as appropriate. The lower limit of the content of the ester compound (A) in the treatment agent is preferably 25% by mass or greater, more preferably 30% by mass or greater. When the content is 25% by mass or greater, the smoothness imparted by the treatment agent to the fiber can be further enhanced. 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 enhanced. Any combination of the above upper and lower limits is also acceptable.

[0027] (Other smoothing agents) For the purpose of improving the smoothness of synthetic fibers, the treatment agent may also contain other smoothing agents other than the ester compound (A) within the scope of not impairing 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 lubricating components include poly-α-olefins. Specific examples of polyolefins include poly-α-olefins obtained by polymerizing 1-butene, 1-hexene, 1-decene, and the like. Commercially available poly-α-olefins can be appropriately used.

[0030] (Ionic surfactant (B)) The treatment agent may further contain an ionic surfactant (B). Including an ionic surfactant (B) in the treatment agent can further improve the tar cleaning performance. 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 can 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 formed by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to fatty alcohols such as polyoxyethylene lauryl ether phosphate, polyoxyethylene oleyl ether phosphate, and polyoxyethylene stearyl ether phosphate; (3) aliphatic sulfonates or aromatic sulfonates such as lauryl sulfonate, myristyl sulfonate, cetyl sulfonate, oleyl sulfonate, stearyl sulfonate, tetradecyl sulfonate, dodecylbenzenesulfonate, secondary alkylsulfonic acid (carbon number 13 or more and less than 15) salts, secondary alkylsulfonic acid (carbon number 11 or more and less than 14) salts, and α-olefin sulfonates; (4) fatty acids such as lauryl sulfate, oleyl sulfate, and stearyl sulfate; Sulfates of fatty alcohols; (5) Sulfates formed by adding at least one alkylene oxide selected from ethylene oxide and propylene oxide to fatty alcohols, such as polyoxyethylene lauryl ether sulfates, polyoxyalkylene (polyoxyethylene, polyoxypropylene) lauryl ether sulfates, and polyoxyethylene oleyl ether sulfates; (6) Sulfates of naturally occurring fatty acids, 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 dioctylsulfosuccinate. 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 tar cleaning properties, 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 formed by combining a Guerbet alcohol having 24 to 32 carbon atoms with thiodipropionic acid. This configuration further enhances 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 greater, more preferably 0.5% by mass or greater. Furthermore, 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 this range, tar cleaning performance can be further improved. Any combination of the upper and lower limits mentioned above is also acceptable.

[0034] Specific examples of the cationic surfactant include lauryltrimethylammonium chloride, cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, behenyltrimethylammonium chloride, and didecyldimethylammonium chloride.

[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 within this range, tar cleaning performance can be further improved. However, any combination of the upper and lower limits mentioned above is also acceptable.

[0037] (Nonionic surfactant (C)) The treatment agent may further contain a nonionic surfactant (C). Inclusion of a nonionic surfactant (C) in the treatment agent can improve the stability of the treatment agent's appearance, and the diluent for coating 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 an alkylene oxide to an alcohol or carboxylic acid, ether-ester compounds having a (poly)oxyalkylene structure formed by adding an alkylene oxide to an ester compound formed by adding an alkylene oxide to an ester compound formed by a carboxylic acid and a polyol, compounds formed by adding an alkylene oxide to a natural oil or fat, or compounds formed by esterifying such a compound with a carboxylic acid, compounds (C1) having a (poly)oxyalkylene structure formed by adding an alkylene oxide to an amine compound such as a primary organic amine, compounds having a (poly)oxyalkylene structure formed by adding an alkylene oxide to a fatty acid amide, amide compounds formed by condensing an amine compound with a carboxylic acid, partial ester compounds formed by carboxylic acids and polyols, etc. Among these, compounds (C1) formed by adding an alkylene oxide to a primary organic amine are preferred from the viewpoint of further improving tar cleaning properties.

[0039] Specific examples of the alcohols used as the raw materials of the nonionic surfactant (C) include (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) isopropyl alcohol, isobutyl alcohol, isohexanol, 2-ethylhexanol, isononanol, isodecanol, isotridecanol, isotetradecane (1) branched alkanols such as ethanol, isopentadecyl alcohol, isohexadecanol, isoheptadecanol, isostearyl alcohol, isonadecanol, isoeicosanol, isoheneicosanol, isodocosanol, isotricosanol, isotetracosanol, isopentacosanol, isohexadecanol, isoheptadecanol, isoctacosanol, isononadecanol, and isotriacontanol; (2) straight-chain alkanols such as tetradecanol, hexadecanol, heptadecanol, octadecanol, and nonadecanol; (3) branched alkanols such as tetradecanol, hexadecanol, heptadecanol, octadecanol, and nonadecanol; (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 (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 a raw material for forming the (poly)oxyalkylene structure of the nonionic surfactant (C) is preferably an alkylene oxide having 2 or more and 4 or less carbon atoms. 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 target compound in the loaded raw materials. Alkylene oxides can be used alone as one type of alkylene oxide, or two or more types of alkylene oxides can be used in appropriate combination. When two or more types of alkylene oxides are used, the addition method can be block addition, random addition, and a combination of block addition and random addition, without special restrictions.

[0042] Specific examples of the polyol 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, sorbitol, pentaerythritol, and sorbitol.

[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, and coconut amine.

[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, linalool acid amide, and wood wax amide.

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

[0046] The lower limit of the content of the compound (C1) formed by adding an alkylene oxide to a primary organic amine 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 compound (C1) is preferably 10% by mass or less, more preferably 5% by mass or less. By limiting the content to this range, tar cleaning performance can be further improved. However, any combination of the above upper and lower limits is also acceptable.

[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 isotridecyl alcohol, a compound obtained by randomly adding 10 mol of EO to 1 mol of isotridecyl alcohol and 10 mol of propylene oxide (hereinafter referred to as PO), 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, followed by esterification with 3 mol of oleic acid, a compound obtained by adding 25 mol of EO to 1 mol of hydrogenated castor oil, crosslinking with adipic acid, and terminal esterification with stearic acid (mass average molecular weight 5000), sorbitan monolaurate, and a compound obtained by adding 1 mol of EO to 1 mol of sorbitan trioleate. 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 combination as appropriate. The lower limit of the nonionic surfactant (C) content in the treatment agent is preferably 20% by mass or greater, more preferably 25% by mass or greater. The upper limit of the nonionic surfactant (C) content is preferably 70% by mass or less, more preferably 65% ​​by mass or less. By limiting the content within this range, the stability of the treatment agent's appearance can be improved, and solvents of varying polarity, such as water and / or organic solvents, can be used as diluents for coating synthetic fibers. Any combination of the aforementioned upper and lower limits is also acceptable.

[0049] When the total content of the smoothing agent (A), the ionic surfactant (B), and the nonionic surfactant is taken as 100% by mass, the synthetic fiber treatment agent of the present invention preferably contains 15% by mass to 80% by mass of the smoothing agent (A), 0.1% by mass to 15% by mass of the ionic surfactant (B), and 15% by mass to 80% by mass of the nonionic surfactant (C). By limiting the content to this range, the effects of the present invention can be further enhanced.

[0050] (Peroxide value) The peroxide value detected in the treatment agent is 100 meq / kg or less, preferably 50 meq / kg or less, and more preferably 20 meq / kg or less. While the peroxide value may increase during storage, even if it exceeds 0 meq / kg, as long as it remains within this range, tar cleaning performance is improved and low smoke generation is achieved. The peroxide value in the treatment agent can be measured using potentiometric titration according to the "Standard Oil and Fats Analysis Test Method" (Peroxide Value (Chloroform Method)) established by the Japan Oil Chemists' Association.

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

[0052] [Number 2]

[0053] By limiting the temperature to this range, the amount of oxygen the treatment agent is exposed to can be reduced, thereby suppressing an increase in the peroxide value, improving tar cleaning performance, and achieving low smoke generation. Furthermore, the filling temperature of the treatment agent into the product container is preferably between 20°C and 80°C, more preferably below 50°C. A filling temperature of 20°C or above can reduce the viscosity of the treatment agent, thereby accelerating the filling speed and improving usability. Furthermore, a filling temperature of 80°C or below can reduce the reaction between oxygen and the treatment agent, thereby suppressing an increase in the peroxide value. Furthermore, to suppress an increase in the peroxide value, the storage temperature of the treatment agent filled in the product container is preferably below 80°C, more preferably between 10°C and 50°C, and most preferably between 20°C and 30°C. The treatment agent should preferably be adjusted to a temperature suitable for each treatment agent before use. Furthermore, to avoid contact with oxygen and thus suppress an increase in the peroxide value, nitrogen pressure delivery or a pump is preferred when filling the treatment agent into the product container.

[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 ratio to this range, the contact between the treatment agent and oxygen can be reduced, thereby suppressing an 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, even more preferably 5 ppm or less, and most preferably 1 ppm or less. By limiting the concentration to this level, an increase in smoke generation after long-term storage can be suppressed.

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

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

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

[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, since the melting point of the treatment agent can be lowered, thereby improving the stability at low temperatures, the treatment agent does not need to be stored 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 determination method (iodine value (Weigu-cyclohexane method)) of the "Benchmark Oil and Fat Analysis Test Method" formulated by the Japan Oil Chemistry Association.

[0060] Furthermore, free radical scavengers such as light stabilizers and phenolic antioxidants may be added to the treatment agent during or after production. To suppress fuming of the added compound itself, the molecular weight of the light stabilizer or free radical scavenger is preferably 300 g / mol or greater, more preferably 450 g / mol or greater, and most preferably 600 g / mol or greater. The amounts of other ingredients used can be limited to those that do not impair the effects of the present invention.

[0061] <Second embodiment> Next, the second embodiment of the synthetic fiber of the present invention will be 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 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 economic efficiency 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 the aqueous liquid can be attached to the synthetic fiber in, for example, the spinning or stretching step. The diluent attached to the synthetic fiber can also be evaporated 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 device or process having a step of passing through a roller at a temperature of 150°C or above in the stretching or heat treatment step, the effect of the invention can be expected to be more effective.

[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), polypropylene 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; and (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 applied to the synthetic fiber is not particularly limited, but it is preferably applied at a ratio of 0.1% to 3% by mass relative to the synthetic fiber (excluding solvents such as water). This configuration further enhances the effects of the present invention. Furthermore, the method for applying the treatment agent is not particularly limited, and known methods such as drum lubrication, guided lubrication using a metering pump, immersion lubrication, and spray lubrication can be employed.

[0064] The use of the synthetic fibers in the present invention is not particularly limited, but preferably they are synthetic fibers that can be used in industrial materials. More preferably, they are synthetic fibers used in the automotive, construction, commercial, agricultural and aquaculture, civil engineering, and other fields, 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, and fibers for ropes.

[0065] The effects of the treatment agent and synthetic fiber according to the above-described embodiment will be described. (1-1) The treatment agent of the above embodiment contains an ester compound (A), and the peroxide value detected in the treatment agent is limited to 100 meq / kg or less. Consequently, tar cleaning performance is improved and low smoke generation is achieved. In particular, even during long-term storage of the treatment agent, degradation of the components in the treatment agent is suppressed, and tar cleaning performance and low smoke generation are maintained even after long-term storage.

[0066] <Reference Embodiment 1> The following description will focus on 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 this embodiment comprises a thiodipropionate, more specifically, an ester compound formed by a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, and is intended to be mixed with a treatment agent. The antioxidant of this embodiment can also be used in a method for providing an antioxidant for a treatment agent, comprising mixing a thiodipropionate, more specifically, an ester compound formed by a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, with the treatment agent.

[0068] The effects of the antioxidant according to the above embodiment will be described. (2-1) The antioxidant of this embodiment is intended for mixing with a treatment agent and comprises a thiodipropionic acid ester, more specifically, an ester compound formed from a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid. This improves the long-term storage stability of the treatment agent. Furthermore, it eliminates the need for nitrogen filling the product container to inhibit the reaction between oxygen and the treatment agent, thereby improving operational efficiency. Furthermore, it eliminates the need to store the treatment agent at low temperatures, thereby improving the handleability of the product.

[0069] In particular, when the treatment agent contains vegetable oil or fish oil, whose components are easily degraded by oxidation, the degradation of these 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 this embodiment comprises a thiodipropionate ester, more specifically, an ester compound formed by a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid. This anti-smoking agent is used in a fiber stretching step. Furthermore, the anti-smoking agent of this embodiment can also be applied to a smoke prevention method in which a thiodipropionate ester, more specifically, an ester compound formed by a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, is applied to fibers prior to the stretching step.

[0071] The effects of the anti-smoking agent according to the above-described embodiment will be described. (3-1) The anti-smoking agent of this embodiment is intended for mixing with a treating agent and contains a thiodipropionic acid ester, more specifically, an ester compound formed from a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid. Therefore, it can reduce smoke generation while maintaining smoothness, particularly during the process of passing through heated rollers, which is prone to generating smoke. The ester compound contained in this anti-smoking agent is less likely to generate low-molecular-weight decomposition products that decompose during long-term storage or thermal decomposition during spinning, which can easily cause smoke generation.

[0072] The above embodiment and the following modifications can be implemented in combination 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, defoaming agents, 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-mentioned 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 only one of the ionic surfactant (B) and the nonionic surfactant (C). Example

[0074] In order to more specifically illustrate the configuration and effects of the present invention, examples and the like 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 agents) (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), 30 parts (%) of a triester of trimethylolpropane and a mixed acid (A2-1), 0.5 parts (%) of a secondary alkanesulfonic acid sodium salt (B1-1) as the ionic surfactant (B), 1 part (%) of oleyl phosphate-dibutylethanolamine salt (B2-2), 2.5 parts (%) of a compound obtained by adding 10 mol of EO to 1 mol of p-lauramine (C1-2), 10 parts (%) of a compound obtained by adding 10 mol of EO to 1 mol of stearyl alcohol (C2-1), 20 parts (%) of a compound obtained by randomly adding 10 mol of EO and 10 mol of PO to 1 mol of p-isotridecyl alcohol (C2-3), and 1 mol of EO to 1 mol of hardened castor oil (C2-4). 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) of 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 another component (D).

[0076] The ester compound in Example 1 was 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 was used within 2 weeks after 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 of synthesis.

[0078] Separately, 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. These treatment agents contained the ester compound (A), the ionic surfactant (B), the nonionic surfactant (C), and the other components (D) in the proportions shown in Table 1.

[0079] The ester compounds used 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 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, a treatment agent prepared using a freshly synthesized ester compound was placed in a glass beaker (inner diameter 4.5 cm) so that the gas-liquid contact area / volume was 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] Separately, 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 of each treatment agent was measured using potentiometric titration according to the "Standard Oil and Fats Analysis Test Method" established by the Japan Oil Chemists' Association (Peroxide Value (Chloroform Method)). The peroxide value of the treatment agent is shown in the "Peroxide Value" column of Table 1.

[0086] The iodine value (IV) of each treatment agent was measured according to the iodine value (Weiguille-cyclohexane method) method specified in 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 contents of all prepared treatment agents were confirmed to be 1 ppm or less by ICP-AES analysis using ICPE-9000 (manufactured by Shimadzu Corporation) to analyze 0.5 g of a sample diluted with ultrapure water to make 100 mL of a solution.

[0088] [Table 1]

[0089] The details of the ester compound (A), ionic surfactant (B), 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: Dioleylthiodipropionate 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 polyol and a fatty acid) A2-1: Trimethylolpropane and mixed acid (palm kernel fatty acid and plant 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 (40 mPa·s at 40°C) <Ionic surfactant (B)> (Sulfonic acid compound (B1)) B1-1: Secondary alkanesulfonic acid sodium salt (C = 11 or more and 14 or less) B1-2: Dioctylsulfosuccinate 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) formed 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: formed by random addition of 10 moles of EO and 10 moles of PO to 1 mole of isotridecanol C2-4: Add 10 mol of EO to 1 mol of hardened castor oil C2-5: Compound formed 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 prepared by adding 25 mol of EO to 1 mol of hardened castor oil, crosslinking with adipic acid, and then terminally esterifying with stearic acid (mass average molecular weight 5000) C2-7: Sorbitan monolaurate C2-8: 10 moles of EO added 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 was diluted with an organic solvent (a mixed solvent of hexane and ethanol) to make a 15% dilution of the treatment agent. The dilution was applied to a non-oiled polyethylene terephthalate fiber of 1000 dtex, 126 filaments, and an inherent viscosity of 0.93 using a guided oiling method at an amount such that the non-volatile component was 5.0%. It was 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 was wiped at 180°C using a cotton swab impregnated with a glycerol solution prepared to 5% NaOH, and the number of times the brown tar disappeared was measured. Tar cleaning properties were 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): More than 100 times and less than 200 times ×(Defective): 200 times or more Test Category 3 (Evaluation of smoke generation) Each prepared treatment agent was uniformly diluted with ion exchange water or an organic solvent (a mixed solvent of hexane and ethanol) as appropriate to obtain a 15% dilution of the treatment agent. Using the oiling drum method, the dilution was applied to unoiled polyethylene terephthalate fibers of 1000 dtex, 126 filaments, and an inherent viscosity of 0.93 at a non-volatile content of 1.0%. The dilution was then dried to obtain a test yarn. The test yarn was brought into contact with a 220°C heating roller at a yarn speed of 300 m / min, and the smoke observed around the heating roller was 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 were rated as acceptable for both 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 process 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, Its characteristics are: The peroxide value detected in 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 in 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 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 by: The synthetic fiber treating agent described in any one of Appendices 1 to 8 is attached.

[0099] (Appendix 10) A method for producing a synthetic fiber treatment agent, comprising producing 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 by: 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-mentioned 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-mentioned 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 treating agent comprising an ester compound (A), characterized in that: The ester compound (A) includes an ester compound (A1) having a thioether bond in its 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 treatment agent for synthetic fibers, comprising an ester compound (A) and an ionic surfactant (B), characterized in that: The ester compound (A) comprises an ester compound of a Guerbet alcohol having 24 to 32 carbon atoms and thiodipropionic acid, The above-mentioned ionic surfactant (B) contains a sulfonic acid compound (B1).

2. 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.

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

4. The synthetic fiber treating agent according to claim 3, wherein The nonionic surfactant (C) includes a compound (C1) in which an alkylene oxide is added to a primary organic amine.

5. A synthetic fiber, characterized in that: The synthetic fiber treating agent according to any one of claims 1 to 4 is attached thereto.

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