Treatment agents for synthetic fibers, synthetic fibers, and methods for manufacturing treatment agents for synthetic fibers.

Abstract

The objective of this invention is to provide a synthetic fiber treatment agent that improves tar cleaning properties and achieves low smoke emission. The synthetic fiber treatment agent of this invention contains an ester compound (A), characterized in that the peroxide value detected from the above-mentioned synthetic fiber treatment agent is 100 meq / kg or less.

Description

Technical Field

[0001] This invention relates to a treatment agent for synthetic fibers that can improve tar cleaning properties and achieve low smoke emission, synthetic fibers, and a method for manufacturing the treatment agent for synthetic fibers. Background Technology

[0002] For example, in the spinning and extending process of synthetic fibers, from the viewpoint of improving smoothness and antistatic properties, a fiber treatment agent is sometimes applied to the surface of the fiber.

[0003] Currently, patent documents 1-3 disclose treatment agents for synthetic fibers. Patent document 1 discloses a lubricating treatment composition for synthetic fibers, which undergoes a thermal processing step containing an epoxide adduct of a specific bisphenol A. Patent document 2 discloses a treatment agent for synthetic fibers containing an ester compound formed by at least one selected from organic acids containing sulfur in their molecules and ester-forming derivatives of organic acids containing sulfur in their molecules with Guerbet alcohol having 6 to 22 carbon atoms. Patent document 3 discloses a treatment agent for synthetic fibers containing an ester compound having a specific thioether bond, wherein the acid value is 0.2 to 10 mg KOH / g and the ash content is 0.01 to 0.5% by mass.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 52-155299

[0007] Patent Document 2: Japanese Patent Application Publication No. 2020-094304

[0008] Patent Document 3: Japanese Patent Application Publication No. 2018-150665 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] However, conventional synthetic fiber treatment agents still seek to improve tar cleanliness and reduce smoke generation.

[0011] Methods for solving problems

[0012] In order to solve the above-mentioned problems, the inventors conducted research and found that the composition of the synthetic fiber treatment agent is particularly good when the peroxide value detected from the synthetic fiber treatment agent is limited to a specific range.

[0013] The various methods used to solve the above problems are recorded.

[0014] Method 1: A synthetic fiber treatment agent containing an ester compound (A), wherein the peroxide value detected from the above synthetic fiber treatment agent is less than 100 meq / kg.

[0015] Method 2: The synthetic fiber treatment agent described in Method 1, wherein the peroxide value detected from the synthetic fiber treatment agent is less than 50 meq / kg.

[0016] Method 3: The synthetic fiber treatment agent described in Method 1 or 2, wherein the ester compound (A) comprises an ester compound (A1) having a thioether bond in its molecule.

[0017] Method 4: The synthetic fiber treatment agent described in any of Methods 1 to 3, wherein the ester compound (A) comprises a complete ester compound (A2) formed by a polyol of three or more members and a fatty acid.

[0018] Method 5: The synthetic fiber treatment agent described in any of Methods 1 to 4, wherein it further contains an ionic surfactant (B).

[0019] Method 6: The synthetic fiber treatment agent described in Method 5, wherein the ionic surfactant (B) comprises a sulfonic acid compound (B1).

[0020] Method 7: The synthetic fiber treatment agent described in any of Methods 1 to 6, wherein,

[0021] It further contains nonionic surfactants (C).

[0022] Method 8: The synthetic fiber treatment agent of Method 7, wherein the nonionic surfactant (C) comprises a compound (C1) formed by the addition of an epoxide to a primary organic amine.

[0023] Method 9: A synthetic fiber, characterized in that it is coated with a synthetic fiber treatment agent as described in any of Methods 1 to 8.

[0024] Method 10: A method for manufacturing a synthetic fiber treatment agent, wherein the synthetic fiber treatment agent described in any of methods 1 to 8 is characterized in that the filling rate calculated from the following formula (1) at 25°C under atmospheric pressure is set to be 60% or more and 100% or less.

[0025] [Number 1]

[0026]

[0027] Invention Effects

[0028] The present invention can improve tar cleanability and achieve low smoke generation. Detailed Implementation

[0029] <First Embodiment>

[0030] The following description pertains to a first embodiment of the synthetic fiber treatment agent (hereinafter referred to as the treatment agent) of the present invention. The treatment agent of this embodiment contains an ester compound (A), and the peroxide value detected from the treatment agent is 100 meq / kg or less.

[0031] (Ester compound (A))

[0032] Ester compound (A) is not particularly limited as long as it is applicable as a smoothing agent in the field of processing agents; examples include ester compounds made from fatty acids and alcohols. 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 number of carbon atoms, branching, and valence of the fatty acids used as raw materials for ester compounds are not particularly limited; however, they can be, for example, higher fatty acids, cyclic fatty acids, or fatty acids with aromatic rings. The number of carbon atoms, branching, and valence of the alcohols used as raw materials for ester compounds are not particularly limited; however, they can be, for example, higher alcohols, cyclic alcohols, or alcohols with aromatic rings.

[0033] The ester compound (A) is preferably an ester compound (A1) containing a thioether bond in its molecule. By including the ester compound (A1) in the ester compound (A), the rise in peroxide value can be suppressed, while the tar cleaning properties are improved and low smoke generation is achieved.

[0034] Specific examples of ester compounds (A1) containing thioether bonds in their molecules include dioctyl thiodipropionate, diisolauryl thiodipropionate, dilauryl thiodipropionate, diisopalmityl thiodipropionate, diisostearyl thiodipropionate, dioleyl thiodipropionate, diisotetraalkyl thiodipropionate, di(2-decyl-1-tetradecanol) thiodipropionate, di(2-dodecyl-1-hexadecanol) thiodipropionate, di(2-octyl-1-decanol) thiodipropionate, 2-ethylhexyl (lauryl thiodipropionate), octyl thiodipropionate, isolauryl thiodipropionate, lauryl thiodipropionate, isopalmityl thiodipropionate, isostearyl thiodipropionate, oleyl thiodipropionate, isotetraalkyl thiodipropionate, etc.

[0035] The ester compound (A1) preferably contains a thiodipropionate, and more specifically, an ester compound formed by a Guerbert alcohol having 24 or more and 32 or fewer carbon atoms and a thiodipropionate. By including this ester compound, low fuming properties can be achieved in particular.

[0036] 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 improved. However, any combination of the above-mentioned upper and lower limits is also possible.

[0037] Furthermore, the ester compound (A) is preferably a complete ester compound (A2) formed by a polyol with three or more but fewer than four members and a fatty acid. By including the ester compound (A2) in the ester compound (A), low smoke emission can be achieved.

[0038] Specific examples of polyols with three or more but less than four members that can be used as raw materials for complete ester compounds (A2) include glycerol, neopentyl tertrol, trimethylolpropane, 2-methyl-2-hydroxymethyl-1,3-propanediol, 1,2,3-butanetriol, 1,2,4-butanetriol, butanetriol, 1,2,3-pentanetriol, 1,2,4-pentanetriol, etc.

[0039] The fatty acids used as raw materials for the complete ester compound (A2) can be of known types, and can be saturated or unsaturated fatty acids. Furthermore, they can be linear or branched. Additionally, they can be monobasic fatty acids or polybasic carboxylic acids. Specific examples of fatty acids include (1) straight-chain alkyl fatty acids such as caprylic acid, nonanoic acid, decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, tetradecanoic acid, pentadecanoic acid, hexadecanoic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, eicosanoic acid, dodecanoic acid, and tetradecanoic 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, myristoleic acid, palmitic acid, oleic acid, tartrate acid, eicosenoic acid, linoleic acid, α-linolenic acid, γ-linolenic acid, and arachidic acid; and (4) fatty acids derived from nature such as castor oil fatty acids, sesame oil fatty acids, rosin oil fatty acids, soybean oil fatty acids, rapeseed oil fatty acids, palm oil fatty acids, palm kernel fatty acids, and coconut oil fatty acids.

[0040] Specific examples of complete ester compounds (A2) include glyceryl trioleate, trimethylolpropane trilaurate, neopentyl tert-octanoate, trimethylolpropane formed with mixed acids (a mixture of palm kernel fatty acids and plant-based oleic acid), trimethylolpropane formed with rapeseed oil fatty acids, trimethylolpropane formed with coconut oil fatty acids, neopentyl tert-octanoate formed with palm oil fatty acids, coconut oil, rapeseed oil, sunflower seed oil, soybean oil, castor oil, sesame oil, fish oil, and other animal and vegetable oils.

[0041] The lower limit of the content of the complete ester compound (A2) in the treatment agent is preferably 10% by mass or more, and 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, and more preferably 60% by mass or less. By limiting the content to this range, low smoke emission can be achieved. Any combination of the above upper and lower limits is also possible.

[0042] As specific examples of ester compounds (A) other than the aforementioned ester compounds (A1) and complete ester compounds (A2), examples include (1) ester compounds formed by aliphatic monohydric alcohols and aliphatic monocarboxylic acids such as butyl stearate, octyl stearate, oleyl laurate, oleyl oleate, isopentaalkyl isostearate, octyl palmitate, oleyl erucic acid, and isotridecyl stearate; and ester compounds formed by (poly)oxyalkylene adducts formed by adding epoxides with 2 or more and 4 or fewer carbon atoms to aliphatic monohydric alcohols and aliphatic monocarboxylic acids. (2) Ester compounds formed by aliphatic polyols such as 1,6-hexanediol didecyl ester and aliphatic monocarboxylic acids, and complete ester compounds formed by (poly)oxyalkylene adducts formed by adding epoxides with 2 or more but less than 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 azelate, and dipolyoxyethylene lauryl adipate and aliphatic polycarboxylic acids, and complete ester compounds formed by adding epoxides with 2 or more but less than 4 carbon atoms to aliphatic monohydric alcohols. (3) Complete ester compounds formed by (poly)oxyalkylene adducts of alkylene oxides and aliphatic polycarboxylic acids; (4) Ester compounds formed by aromatic monohydric alcohols such as benzyl oleate, benzyl laurate and polyoxypropylene benzyl stearate and aliphatic monocarboxylic acids; ester compounds formed by (poly)oxyalkylene adducts of alkylene oxides with 2 or more and 4 or fewer carbon atoms added 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, (poly)oxyalkylene adducts formed by adding alkylene oxides with 2 or more carbon atoms to aromatic polyols and aliphatic monocarboxylic acids to form complete ester compounds; (6) complete ester compounds formed by adding bis(2-ethylhexyl) phthalate, diisostearyl isophthalate, trioctyltriphenyl ester and other aliphatic monohydric alcohols and aromatic polycarboxylic acids to aromatic polycarboxylic acids, and (poly)oxyalkylene adducts formed by adding alkylene oxides with 2 or more carbon atoms to aliphatic monohydric alcohols and aromatic polycarboxylic acids to form complete ester compounds, etc.

[0043] These ester compounds (A) can be used alone or in combination with two or more ester compounds.

[0044] The lower limit of the content of ester compound (A) in the treatment agent is preferably 25% by mass or more, and more preferably 30% by mass or more. When the content is 25% by mass or more, the smoothness imparted to the fiber by the treatment agent can be improved. The upper limit of the content of ester compound (A) is preferably 80% by mass or less, and more preferably 70% by mass or less. When the content is 80% by mass or less, the stability of the treatment agent can be improved. Any combination of the above upper and lower limits is also possible.

[0045] (Other smoothing agents)

[0046] For purposes such as improving the smoothness of synthetic fibers, the treatment agent may also contain smoothing agents other than ester compound (A) without compromising the effects of the present invention. Examples of such smoothing agents include mineral oil (kinematic viscosity of 5 mm at 40°C). 2 Items with a per-second ratio (e.g., polyolefins), etc.

[0047] Mineral oils can be categorized as, for example, aromatic hydrocarbons, paraffinic hydrocarbons, and cycloalkanes. More specifically, examples include spindle oils and flowable paraffins.

[0048] 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 may be used appropriately.

[0049] (Ionic surfactant (B))

[0050] The treatment agent may further contain an ionic surfactant (B). By including an ionic surfactant (B) in the treatment agent, the tar cleaning properties can be particularly improved. The ionic surfactant (B) may be of known quality. Examples of ionic surfactants (B) include anionic surfactants, cationic surfactants, and amphoteric surfactants.

[0051] Anionic surfactants may be appropriately selected from those known to the public. Specific examples of anionic surfactants include, for example, (1) phosphate salts of aliphatic alcohols such as lauryl phosphate, cetyl phosphate, octyl phosphate, oleyl phosphate, and stearyl phosphate; (2) phosphate salts of epoxides selected from at least one of ethylene oxide and propylene oxide, formed by the addition of polyoxyethylene lauryl ether phosphate, polyoxyethylene oleyl ether phosphate, and polyoxyethylene stearyl ether phosphate to aliphatic alcohols; (3) aliphatic sulfonates or aromatic sulfonates such as lauryl sulfonate, myristyl sulfonate, cetyl sulfonate, oleyl sulfonate, stearyl sulfonate, tetradecyl sulfonate, dodecylbenzene sulfonate, secondary alkyl sulfonates (13 to 15 carbon atoms), secondary alkyl sulfonates (11 to 14 carbon atoms), and α-olefin sulfonates; and (4) aliphatic sulfonates such as lauryl sulfate, oleyl sulfate, and stearyl sulfate. Sulfate salts of aliphatic alcohols; (5) Sulfate salts of polyoxyethylene lauryl ether sulfate, polyoxyalkylene (polyoxyethylene, polyoxypropylene) lauryl ether sulfate, polyoxyethylene oil ether sulfate, etc., which are formed by the addition of aliphatic alcohols to ethylene oxide and propylene oxide; (6) Sulfate salts of fatty acids derived from natural sources, such as castor oil fatty acid sulfate, sesame oil fatty acid sulfate, rosin oil fatty acid sulfate, soybean oil fatty acid sulfate, rapeseed oil fatty acid sulfate, and palm oil fatty acid sulfate; (7) Sulfate salts of natural oils, such as castor oil sulfate, sesame oil sulfate, rosin oil sulfate, soybean oil sulfate, rapeseed oil sulfate, and palm oil sulfate; (8) Fatty acid salts such as laurates, oleates, and stearates; (9) Sulfosuccinate salts of aliphatic alcohols, such as dioctyl sulfosuccinate. Examples of relative ions for anionic surfactants include alkali metal salts such as potassium and sodium salts, ammonium salts, triethanolamine salts, (poly)oxyalkylene alkylamine salts, and alkylolamine salts such as dibutylethanolamine salts.

[0052] From the perspective of improving the cleaning properties of tar, anionic surfactants are preferably sulfonic acid compounds (B1) containing aliphatic sulfonates.

[0053] When the anionic surfactant contains a sulfonic acid compound (B1), the ester compound (A) is preferably a thiodipropionate, more specifically an ester compound formed by combining a Guerbert alcohol with 24 or more and 32 or fewer carbon atoms with thiodipropionate. This configuration further enhances the effectiveness of the present invention.

[0054] The lower limit of the content of sulfonic acid compound (B1) in the treatment agent is preferably 0.1% by mass or more, and more preferably 0.5% by mass or more. Furthermore, the upper limit of the content of sulfonic acid compound (B1) is preferably 5% by mass or less, and more preferably 3.5% by mass or less. By limiting the content to this range, the tar cleaning properties can be improved. Any combination of the above upper and lower limits is also possible.

[0055] Specific examples of cationic surfactants include lauryl trimethylammonium chloride, cetyl trimethylammonium chloride, stearyl trimethylammonium chloride, behenyl trimethylammonium chloride, and dialcyl dimethylammonium chloride.

[0056] Specific examples of amphoteric surfactants include betaine-type amphoteric surfactants. This plasma surfactant (B) can be used alone as a single type of ionic surfactant, or it can be used in combination with two or more ionic surfactants.

[0057] The lower limit of the content of ionic surfactant (B) 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 of ionic surfactant (B) is preferably 10% by mass or less, and more preferably 6% by mass or less. By limiting the content to this range, the tar cleaning properties can be improved. Any combination of the above upper and lower limits is also possible.

[0058] (Nonionic surfactant (C))

[0059] The treatment agent may also contain a nonionic surfactant (C). By including a nonionic surfactant (C) in the treatment agent, the stability of the treatment agent's appearance can be improved, and the diluent used when coating synthetic fibers can be made with solvents of different polarities, such as water and / or organic solvents.

[0060] Nonionic surfactants (C) may include, for example, compounds having a (poly)oxyalkylene structure formed by adding an epoxide to alcohols or carboxylic acids; ether / ester compounds having a (poly)oxyalkylene structure formed by adding an epoxide to an ester compound formed by adding an epoxide to a carboxylic acid and a polyol; compounds formed by adding an epoxide to natural oils or by esterifying such compounds with carboxylic acids; compounds having a (poly)oxyalkylene structure formed by adding an epoxide to an amine compound, such as a primary organic amine (C1); compounds having a (poly)oxyalkylene structure formed by adding an epoxide to fatty acid amides; amide compounds formed by condensing amine compounds with carboxylic acids; and partial ester compounds formed by carboxylic acids and polyols. Among these, from the viewpoint of further improving tar cleaning properties, compounds having an epoxide added to a primary organic amine (C1) are preferred.

[0061] Specific examples of alcohols used as raw materials for nonionic surfactants (C) include: (1) methanol, ethanol, propanol, butanol, pentanol, hexanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosane, dodecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, triadecanol, etc., straight-chain alkanols; (2) isopropanol, isobutanol, isohexanol, 2-ethylhexanol, isononol, isodecanol, isodecanol, isodecanol, isotetradecanol, etc. Branched alkanols such as isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, isopentadecanol, etc.; (3) Straight-chain enols such as tetradecenol, hexadecenol, heptadecenol, octadecenol, nonadecanol, etc.; (4) Branched enols such as isopentadecanol, isopentadecanol, etc.; (5) Cyclic alkanols such as cyclopentanol, cyclohexanol, etc.; (6) Aromatic alcohols such as phenol, nonanol, benzyl alcohol, monostyrene, stilbene, tristyrene, etc.

[0062] Specific examples of carboxylic acids used as raw materials for nonionic surfactants (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, dodecanoic acid, etc.; (2) branched-chain alkyl carboxylic acids such as 2-ethylhexanoic acid, isododecanoic acid, isotridecanoic acid, isotetradecanoic acid, isohexadecanoic acid, etc.; (3) straight-chain alkenyl carboxylic acids such as octadecenoic acid, octadecadienoic acid, octadectrienoic acid, etc.; (4) aromatic carboxylic acids such as benzoic acid; and (5) hydroxycarboxylic acids such as ricinoleic acid, etc.

[0063] The epoxide used as a raw material for forming the (poly)oxyalkylene structure of the nonionic surfactant (C) is preferably an epoxide with 2 or more and 4 or fewer carbon atoms. Specific examples of epoxides include ethylene oxide, propylene oxide, and butane oxide. The molar number of epoxides added can be appropriately set, preferably 0.1 moles or more and 250 moles or less, more preferably 1 mole or more and 200 moles or less, and most preferably 2 moles or more and 150 moles or less. It can also be any combination of the above upper and lower limits. Herein, the molar number of epoxides added represents the number of moles of epoxide relative to 1 mole of the target compound in the loaded raw material. One type of epoxide can be used alone, or two or more epoxides can be used in combination appropriately. When two or more types of epoxides are used, the addition method can be block addition, random addition, and a combination of block addition and random addition, without particular limitation.

[0064] Specific examples of polyols used as raw materials for nonionic surfactants (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, dehydrosorbitol, neopentyl tertrol, sorbitol, etc.

[0065] Examples of aliphatic amines or primary organic amines used as raw materials for nonionic surfactants (C) include methylamine, ethylamine, butylamine, octylamine, laurylamine, stearylamine, octadeceneamine, and coconutamine.

[0066] Specific examples of fatty acid amides used as raw materials for nonionic surfactants (C) include caprylate amide, lauryl amide, palmitamide, stearamide, oleamide, eucalyptol amide, and styrax amide.

[0067] Specific examples of compounds (C1) formed by the addition of epoxides to primary organic amines include, for instance, the addition of 3 moles of ethylene oxide (hereinafter referred to as EO) to 1 mole of laurylamine, the addition of 10 moles of EO to 1 mole of laurylamine, the addition of 10 moles of EO to 1 mole of stearylamine, and the addition of 15 moles of EO to 1 mole of stearylamine. The number of moles of epoxide added to the compound (C1) can be appropriately set, preferably between 1 mole and 25 moles, more preferably between 3 moles and 20 moles. It can also be any combination of the above upper and lower limits.

[0068] The lower limit of the content of the compound (C1) formed by the addition of a primary organic amine to an epoxide 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 this compound (C1) is preferably 10% by mass or less, more preferably 5% by mass or less. By limiting the content to this range, the tar cleaning properties can be improved. Any combination of the above upper and lower limits is also possible.

[0069] Specific examples of nonionic surfactants (C) other than those mentioned above include: compounds formed by adding 10 moles of EO to 1 mole of stearyl alcohol; compounds formed by adding 10 moles of EO to 1 mole of isotriadecyl alcohol; compounds formed by randomly adding 10 moles of EO to 1 mole of isotriadecyl alcohol and 10 moles of propylene oxide (hereinafter referred to as PO); compounds formed by adding 10 moles of EO to 1 mole of hardened castor oil; compounds formed by esterifying 1 mole of hardened castor oil with 20 moles of EO and then with 3 moles of oleic acid; compounds formed by crosslinking 1 mole of hardened castor oil with 25 moles of EO and then with adipic acid followed by terminal esterification with stearic acid (mass average molecular weight 5000); dehydrated sorbitan monolaurate; and compounds formed by adding 1 mole of EO to dehydrated sorbitan trioleate. Ester formed by 10 moles of diglycerol and 2 moles 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.

[0070] These nonionic surfactants (C) can be used alone or in combination with two or more nonionic surfactants.

[0071] In the treatment agent, the lower limit of the content of the nonionic surfactant (C) is preferably 20% by mass or more, and more preferably 25% by mass or more. The upper limit of the content of the nonionic surfactant (C) is preferably 70% by mass or less, and more preferably 65% ​​by mass or less. By limiting the content to this range, the appearance stability of the treatment agent can be improved, and the diluent for coating synthetic fibers can be used with solvents of different polarities such as water and / or organic solvents. The range can also be any combination of the above upper and lower limits.

[0072] When the total content of the smoothing agent (A), ionic surfactant (B), and nonionic surfactant is set to 100% by mass, the synthetic fiber treatment agent of the present invention preferably contains 15% by mass and 80% by mass of the smoothing agent (A), 0.1% by mass and 15% by mass of the ionic surfactant (B), and 15% by mass and 80% by mass of the nonionic surfactant (C). By limiting it to this range, the effect of the present invention can be further improved.

[0073] (Peroxide value)

[0074] 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 may increase during storage, but even if it exceeds 0 meq / kg, as long as it remains within this range, tar cleaning properties can be improved and low smoke generation can be achieved. The peroxide value in the treatment agent can be determined using potentiometric titration according to the determination method (peroxide value (chloroform method)) in the "Standard Oil Analysis Test Method" established by the Japan Oil Chemistry Society.

[0075] (Method for manufacturing the treatment agent)

[0076] The treatment agent is filled into the product container after mixing the above-mentioned components. From the viewpoint of suppressing peroxide value, the raw materials of the treatment agent are preferably stored at 80°C or below, more preferably at 10°C or above and 50°C or below, and most preferably at 20°C or above and 30°C or below. The filling rate of the treatment agent in the product container is preferably limited to 60% by volume or more and 100% by volume of the filling rate calculated from the following formula (1) at 25°C under atmospheric pressure.

[0077] [Number 2]

[0078]

[0079] By limiting the temperature to this range, the amount of oxygen exposed to the treatment agent can be reduced, thereby suppressing the rise in peroxide value, improving tar cleaning properties, and achieving low smoke emission. Furthermore, the filling temperature of the treatment agent into the product container is preferably 20°C or higher and 80°C or lower, more preferably 50°C or lower. When the filling temperature is 20°C or higher, the viscosity of the treatment agent can be reduced, thereby accelerating the filling speed and improving usability. Furthermore, when the filling temperature is 80°C or lower, the reaction between oxygen and the treatment agent can be reduced, thus suppressing the rise in peroxide value. Moreover, from the viewpoint of suppressing the rise in peroxide value, the storage temperature of the treatment agent filled into the product container is preferably 80°C or lower, more preferably 10°C or higher and 50°C or lower, and most preferably 20°C or higher and 30°C or lower. It is preferable to adjust the treatment agent to a temperature suitable for each treatment agent before use. Furthermore, when filling the treatment agent into the product container, from the viewpoint of avoiding contact with oxygen and thus suppressing the rise in peroxide value, it is preferable to use nitrogen pressure delivery or a pump method.

[0080] 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 it to this range, the contact between the treatment agent and oxygen can be reduced, thereby suppressing the rise of peroxide value.

[0081] (other)

[0082] The concentration of Cu ions in the treatment agent is preferably below 50 ppm, more preferably below 10 ppm, even more preferably below 5 ppm, and most preferably below 1 ppm. By limiting the concentration to this level, the increase in fumes after long-term storage can be suppressed.

[0083] The concentration of Fe ions in the treatment agent is preferably below 50 ppm, more preferably below 10 ppm, even more preferably below 5 ppm, and most preferably below 1 ppm. By limiting the concentration to this level, the increase in fumes after long-term storage can be suppressed.

[0084] To suppress the increase of Cu and Fe ions in the treatment agent, it is preferable to use aluminum, stainless steel, ceramic, fluororesin, or glass apparatus or devices in the steps of product synthesis, storage, transfer, mixing, neutralization, dissolution, filtration, and purification. Furthermore, the raw materials or treatment agent can also undergo adsorption treatment using ion exchange, inorganic adsorbents, or crystallization. The concentrations of Cu and Fe ions in the treatment agent can be determined by ICP-luminescence analysis.

[0085] In addition, the treatment agent can also be mixed with benzotriazole, dialkylthiol thiadiazole, citric acid, tartaric acid, ascorbic acid, amino acids and other metal deactivators as other components.

[0086] Furthermore, the iodine value (IV) of the treatment agent is preferably 10 meq / kg or higher and 60 meq / kg or lower. When the iodine value (IV) is 10 meq / kg or higher, the melting point of the treatment agent is lowered, thereby improving low-temperature stability, so it is not necessary to store the treatment agent at high temperatures. In addition, the usability of the treatment agent is improved. When the iodine value (IV) is 60 meq / kg or lower, the rise of peroxide value can be suppressed. In addition, it can also solve post-processing problems such as poor unwinding caused by the deterioration of the treatment agent adhering to the yarn. The iodine value (IV) of the treatment agent can be determined according to the determination method (iodine value (Widmanstätten-cyclohexane method)) of the "Standard Oil Analysis Test Method" established by the Japan Oil Chemical Society.

[0087] Furthermore, light stabilizers, phenolic antioxidants, and other free radical scavengers can be mixed in during or after the manufacturing process of the treatment agent. From the viewpoint of suppressing fumes generated by the added compound itself, the molecular weight of the light stabilizer or free radical scavenger is preferably 300 g / mol or higher, more preferably 450 g / mol or higher, and most preferably 600 g / mol or higher. The combined amounts of other components can be limited to a range that does not impair the effects of the present invention.

[0088] <Second Implementation>

[0089] Next, a second embodiment embodying the synthetic fiber of the present invention will be described. The synthetic fiber of this embodiment is coated with the treatment agent of the first embodiment. The treatment agent used to coat the synthetic fiber can also be a diluted solution diluted with a diluent, such as an organic solvent solution or an aqueous solution. From the viewpoint of the adhesion of the treatment agent to the fiber and economy, the diluent is preferably a hydrocarbon with 10 or more but less than 15 carbon atoms and / or water. Aqueous solutions or similar diluents can be coated onto the synthetic fiber, for example, during spinning or drawing steps. The diluted solution coated onto the synthetic fiber can also be evaporated during the drawing or drying steps. There are no particular limitations as long as the coating step is performed during spinning. The effects of the invention are more likely to be expected by using it in manufacturing equipment or processes that include steps involving rollers passing through rollers at 150°C or higher in the drawing or heat treatment steps.

[0090] There are no particular limitations on the specific examples of synthetic fibers to which the treatment agent of this embodiment is applied, and examples include (1) polyester fibers such as polyethylene terephthalate (PET), polyethylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polylactic acid, and composite fibers containing such 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 preferred.

[0091] There are no particular limitations on the proportion of the treatment agent adhering to the synthetic fibers, but it is preferable to adhere the treatment agent at a proportion of 0.1% to 3% by mass relative to the synthetic fibers (excluding solvents such as water). This configuration further enhances the effectiveness of the invention. Furthermore, there are no particular limitations on the method of adhering the treatment agent, and known methods such as roller oiling, guided oiling using a metering pump, immersion oiling, and spray oiling can be employed.

[0092] The uses of synthetic fibers in this invention are not particularly limited, but are preferably synthetic fibers that can be used in industrial materials. More preferably, they are synthetic fibers used in the automotive, construction, commercial, agricultural and aquaculture, and civil engineering fields, such as fibers for airbags, seat belts, tire cords, carpets, tents, advertising fabrics, fishing nets, conveyor belts, and ropes.

[0093] The effects of the treatment agent and synthetic fiber in the above embodiments will be explained.

[0094] (1-1) The treatment agent of the above embodiment contains an ester compound (A), and the peroxide value detected from the treatment agent is limited to 100 meq / kg or less. Therefore, it is possible to improve tar cleaning properties and achieve low smoke generation. 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 properties and low smoke generation can be maintained even after long-term storage.

[0095] <Reference Implementation Method 1>

[0096] The following description refers to the antioxidant of Embodiment 1. The description focuses on the differences from the treatment agent described above.

[0097] The antioxidant of this embodiment contains thiodipropionate, more specifically, an ester compound formed by Guerbert alcohol with 24 or more and 32 or fewer carbon atoms and thiodipropionic acid, which is an antioxidant used to mix with the treatment agent. The antioxidant of this embodiment can also be applied to an antioxidant method for a treatment agent in which thiodipropionate, more specifically, an ester compound formed by Guerbert alcohol with 24 or more and 32 or fewer carbon atoms and thiodipropionic acid, is mixed into the treatment agent.

[0098] The effects of the antioxidants described in the above embodiments will be explained.

[0099] (2-1) The antioxidant in this embodiment is used to mix with the treatment agent and contains thiodipropionate, more specifically, an ester compound formed by Guerbert alcohol containing 24 or more and 32 or fewer carbon atoms and thiodipropionate. Therefore, the long-term storage stability of the treatment agent can be improved. Furthermore, the treatment or disposal process, such as filling the product container with nitrogen to suppress the reaction between oxygen and the treatment agent, can be eliminated, thereby improving work efficiency. In addition, it is not necessary to store the treatment agent at a low temperature, thereby improving the operability of the product.

[0100] In particular, when the treatment agent contains vegetable oil or fish oil that is prone to deterioration due to oxidation, it can inhibit the deterioration of the component, thereby seeking to maintain the function of the smoothing agent.

[0101] <Reference Implementation Method 2>

[0102] The following description refers to the anti-smoke agent of Embodiment 2. The description focuses on the differences from the treatment agent described above.

[0103] The anti-smoke agent of this embodiment contains thiodipropionate, more specifically, an ester compound formed by Guerbert alcohol with 24 or more and 32 or fewer carbon atoms and thiodipropionic acid, and is an anti-smoke agent used in the fiber drawing step. Furthermore, the anti-smoke agent of this embodiment can also be applied to a smoke prevention method, in which the ester compound formed by Guerbert alcohol with 24 or more and 32 or fewer carbon atoms and thiodipropionic acid is applied to the fiber before the drawing step.

[0104] The effects of the anti-smoke agent described in the above embodiments will be explained.

[0105] (3-1) The anti-smoking agent of this embodiment is used to mix with the treatment agent and contains thiodipropionate, more specifically, an ester compound formed by Guerbert alcohol containing 24 or more and 32 or fewer carbon atoms and thiodipropionate. Therefore, it can reduce smoke generation while providing smoothness in the step of passing through the heating roller, which is prone to generating smoke. The ester compound contained in this anti-smoking agent does not easily generate low molecular weight decomposition products that decompose during long-term storage or thermally decompose during spinning, thus easily leading to smoke generation.

[0106] The above-described embodiments can also be modified as follows. The above-described embodiments and the following modifications can be combined and implemented with each other within the scope of technical inconsistency.

[0107] • Without impairing the effects of the present invention, the treatment agent of the above embodiments may also be further mixed during or after the manufacturing of the treatment agent with other stabilizers, antistatic agents, binders, antioxidants, ultraviolet absorbers, defoamers, preservatives, rust inhibitors and other ingredients that are commonly used in treatment agents, in order to maintain the quality of the treatment agent.

[0108] • The treatment agent in the above embodiments does not necessarily contain the ionic surfactant (B) and nonionic surfactant (C) described above. Alternatively, the treatment agent may contain both ionic surfactant (B) and nonionic surfactant (C), or it may contain only one of ionic surfactant (B) and nonionic surfactant (C).

[0109] Example

[0110] The following embodiments are provided to illustrate the structure and effects of the present invention in more detail, but the present invention is not limited to these embodiments. Unless otherwise specified, in the following descriptions of embodiments and comparative examples, parts represent parts by mass, and % represents % by mass.

[0111] Test Category 1 (Preparation of Treatment Agent)

[0112] (Example 1)

[0113] The treatment agent prepared in Example 1 comprises, as shown in Table 1, 5 parts (%) of di(2-decyl-1-tetradecanool) thiodipropionate (A1-1), a trimethylolpropane and mixed acid triester (A2-1), 30 parts (%) of sodium dialkyl sulfonate (B1-1), an ionic surfactant (B), 1 part (%) of oleophosphate-dibutylethanolamine (B2-2), 2.5 parts (%) of p-laurhodium 1 mole added to 10 moles of EO (C1-2), a nonionic surfactant (C), 10 parts (%) of p-stearyl alcohol added to 10 moles of EO, 20 parts (%) of isotriadecanool added to 10 moles of EO and PO, and 10 moles of EO added to 1 mole of hardened castor oil. 20 parts (%) of compound (C2-5) obtained by esterification of 20 moles with 3 moles of oleic acid, 5 parts (%) of dehydrated sorbitan monolaurate (C2-7), 5 parts (%) of 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 components (D).

[0114] In Example 1, the ester compound 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 had not been in storage for more than 2 weeks after synthesis.

[0115] In addition, other compounds besides esters were stored in polyethylene containers 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 not more than 2 weeks after synthesis.

[0116] In addition, the temperature of each raw material compound was adjusted to 40°C in a water bath, and then the treatment agent was prepared under a nitrogen atmosphere.

[0117] (Examples 2-14, Comparative Examples 1-4)

[0118] The treatment agents of Examples 2-14 and Comparative Examples 1-4 were prepared in the same manner as the treatment agent of Example 1, and contained ester compounds (A), ionic surfactants (B), nonionic surfactants (C), and other components (D) in the proportions shown in Table 1.

[0119] In Examples 7, 9, 10, and 14, the ester compounds were placed in glass beakers (4.5 cm inner diameter) with a gas-liquid contact area / volume of 0.25 [1 / cm] and stored at 70°C for 2 weeks.

[0120] In the embodiments other than those described above, the ester compounds were stored in polyethylene containers 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 less than 2 weeks after synthesis.

[0121] The ester compound used in Comparative Example 1 was placed in a glass beaker (inner diameter 4.5 cm) with a gas-liquid contact area / volume of 0.25 [1 / cm] and stored at 70°C for 4 weeks.

[0122] Comparative Example 2 uses a freshly synthesized ester compound, and the prepared treatment agent is placed in a glass beaker (inner diameter 4.5 cm) with a gas-liquid contact area / volume ratio of 0.5, and stored at 70°C for 6 weeks.

[0123] Other compounds besides esters were stored in polyethylene containers 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 within 2 weeks after synthesis.

[0124] In addition, the temperature of each raw material compound was adjusted to 40°C in a water bath, and then the treatment agent was prepared under a nitrogen atmosphere.

[0125] The types and contents of ester compounds (A), ionic surfactants (B), nonionic surfactants (C), and other components (D) are shown in the columns “Ester Compounds (A)”, “Ionic Surfactants (B)”, “Nonionic Surfactants (C)”, and “Other Components (D)” of Table 1, respectively.

[0126] The peroxide value of each treatment agent was determined by potentiometric titration according to the determination method (peroxide value (chloroform method)) in the "Standard Oil Analysis Test Method" established by the Japan Oil Chemistry Society. The peroxide value of the treatment agent is shown in the "Peroxide Value" column of Table 1.

[0127] The iodine value (IV) of each treatment agent was determined according to the determination method (Iodine Value (Widmanstätten-Cyclohexane Method)) in the "Standard Oil Analysis Test Method" established by the Japan Oil Chemistry Society. The iodine value (IV) of the treatment agent is shown in the "Iodine Value" column of Table 1.

[0128] The Fe and Cu content in all the prepared treatment agents was determined and confirmed to be below 1 ppm by ICP-AES. ICP-AES was performed using an ICPE-9000 (manufactured by Shimadzu Corporation) to analyze a 0.5 g sample diluted with ultrapure water to a 100 mL solution.

[0129] [Table 1]

[0130]

[0131] The details of the ester compounds (A), ionic surfactants (B), nonionic surfactants (C), and other components (D) listed in Table 1 are as follows.

[0132] <Ester Compound (A)>

[0133] (Ester compounds containing thioether bonds in the molecule (A1))

[0134] A1-1: Di(2-decyl-1-tetradecanool)thiodipropionate

[0135] A1-2: Di(2-dodecyl-1-hexadecyl alcohol) thiodipropionate

[0136] A1-3: Dioleothiodipropionate

[0137] A1-4: Di(2-octyl-1-decyl)thiodipropionate

[0138] A1-5: 2-Ethylhexyl (Lauryl Thiopropionate)

[0139] (A2) is a complete ester compound formed by a polyol with three or more but less than four components and a fatty acid.

[0140] A2-1: Triester of trimethylolpropane and mixed acids (palm kernel fatty acids and plant-based oleic acid, in a mass ratio of 4:6).

[0141] A2-2: Rapeseed Oil

[0142] (Other ester compounds (A))

[0143] A3-1: Dioleoyl adipate

[0144] A3-2: Oil-based erucic acid ester

[0145] (Other smoothing agents)

[0146] rA-1: Mineral oil (40 mPa·s at 40℃)

[0147] <Ionic Surfactant (B)>

[0148] (Sulfonic acid compound (B1))

[0149] B1-1: Sodium secondary alkyl sulfonate (C = 11 or higher, 14 or lower)

[0150] B1-2: Sodium dioctylsulfosuccinate

[0151] B1-3: Sodium α-olefin sulfonate

[0152] (Other ionic surfactants (B))

[0153] B2-1: Potassium oleate

[0154] B2-2: Oil-based phosphate ester - dibutylethanolamine salt

[0155] B2-3: Isocetyl phosphate-triethanolamine salt

[0156] <Nonionic Surfactant (C)>

[0157] (A compound formed by the addition of an epoxide to a primary organic amine (C1))

[0158] C1-1: The product is obtained by adding 3 moles of EO to 1 mole of laurylamine.

[0159] C1-2: The product is obtained by adding 1 mole of p-lauridine to 10 moles of EO.

[0160] C1-3: The product is obtained by adding 1 mole of stearamine to 10 moles of EO.

[0161] C1-4: The product is obtained by adding 1 mole of stearamine to 15 moles of EO.

[0162] (Other nonionic surfactants (C))

[0163] C2-1: The product obtained by adding 1 mole of stearyl alcohol to 10 moles of EO.

[0164] C2-2: The product is formed by adding 1 mole of isotridecyl alcohol to 10 moles of EO.

[0165] C2-3: The product of random addition of 1 mole of isotredecyl alcohol to 10 moles of EO and 10 moles of PO.

[0166] C2-4: The product obtained by adding 10 moles of EO to 1 mole of hardened castor oil.

[0167] C2-5: A compound formed by adding 20 moles of EO to 1 mole of hardened castor oil and then esterifying it with 3 moles of oleic acid.

[0168] C2-6: A compound (mass average molecular weight 5000) formed by adding 25 moles of EO to 1 mole of hardened castor oil, crosslinking with adipic acid, and then terminal esterifying with stearic acid.

[0169] C2-7: Dehydrated sorbitan monolaurate

[0170] C2-8: The product formed by adding 1 mole of dehydrated sorbitan trioleate to 10 moles of EO.

[0171] C2-9: The ester formed by 1 mole of diglycerol and 2 moles of isostearic acid

[0172] C2-10: Diester formed from polyethylene glycol (mass average molecular weight 600) and lauric acid.

[0173] C2-11: Diester formed from polyethylene glycol (mass average molecular weight 600) and oleic acid.

[0174] C2-12: Oleyl diethanolamide

[0175] <Other Ingredients (D)>

[0176] D1-1: Tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate

[0177] D1-2: 4,4'-Butylbis(6-tert-butyl-m-cresol)

[0178] D1-3: Tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate

[0179] D1-4: 2,2'-Methylenebis(4-ethyl-6-tert-butanol)

[0180] Test Category 2 (Evaluation of Tar Cleaning Properties)

[0181] The freshly prepared treatment agents were diluted with an organic solvent (a mixture of hexane and ethanol) to obtain a 15% dilution. Using a guided oiling method, the diluted solution was applied to un-oiled polyethylene terephthalate (PET) fibers with a non-volatile content of 5.0%. The fibers were then brought into contact with a matte chrome needle at a surface temperature of 240°C under an initial tension of 1.5 kg and a yarn speed of 0.1 m / min. The brown tar adhering to the operating area and surrounding area of ​​the fiber was wiped at 180°C with a cotton swab soaked in a 5% NaOH glycerol solution, and the number of times the brown tar disappeared was measured. Tar cleaning performance was evaluated based on the following criteria. The results are shown in the "Tar Cleaning Performance" column of Table 1.

[0182] Evaluation criteria for tar cleaning performance

[0183] ◎(Good): Less than 100 times

[0184] ○ (Acceptable): More than 100 times but less than 200 times

[0185] × (Poor): More than 200 times

[0186] Test Category 3 (Evaluation of Smoke Generation)

[0187] Each prepared treatment agent was uniformly diluted with deionized water or an organic solvent (a mixture of hexane and ethanol) as needed to obtain a 15% dilution. The diluted solution, with a non-volatile component concentration of 1.0%, was applied to un-oiled polyethylene terephthalate (PET) fibers of 1000 dtex, 126 filament, and an intrinsic viscosity of 0.93 using an oiling roller method. The diluted solution was then dried to obtain the test yarn. The test yarn was brought into contact with a heated roller at 220°C at a yarn speed of 300 m / min, and the smoke observed around the heated roller was evaluated using the following criteria. The results are shown in the "Smoke" column of Table 1.

[0188] • Evaluation criteria for smoke generation

[0189] ◎(Good): No smoke observed

[0190] ○ (Fair): Slight smoke was observed.

[0191] × (Poor): Smoke was clearly observed.

[0192] The results in Table 1 clearly show that the tar cleaning properties and smoke generation of the treatment agents in each embodiment are rated as acceptable. According to the present invention, tar cleaning properties can be improved and low smoke generation can be achieved, particularly in the spinning process of synthetic fibers.

[0193] This disclosure also includes the following methods.

[0194] (Appendix 1)

[0195] A synthetic fiber treatment agent containing an ester compound (A) and used in the spinning or drawing process.

[0196] Its features are:

[0197] The peroxide value detected by the above-mentioned synthetic fiber treatment agent was below 100 meq / kg.

[0198] (Appendix 2)

[0199] The synthetic fiber treatment agent as described in Appendix 1, wherein...

[0200] The peroxide value detected by the above-mentioned synthetic fiber treatment agent was below 50 meq / kg.

[0201] (Appendix 3)

[0202] The synthetic fiber treatment agent as described in Appendix 1, wherein...

[0203] The ester compound (A) mentioned above includes ester compounds (A1) that have thioether bonds in their molecules.

[0204] (Appendix 4)

[0205] The synthetic fiber treatment agent as described in Appendix 1, wherein...

[0206] The aforementioned ester compound (A) comprises a complete ester compound (A2) formed by a polyol with three or more but less than four members and a fatty acid.

[0207] (Appendix 5)

[0208] The synthetic fiber treatment agent as described in Appendix 1, wherein...

[0209] It further contains ionic surfactants (B).

[0210] (Appendix 6)

[0211] The synthetic fiber treatment agent as described in Appendix 5, wherein...

[0212] The aforementioned ionic surfactant (B) contains a sulfonic acid compound (B1).

[0213] (Appendix 7)

[0214] The synthetic fiber treatment agent as described in Appendix 1, wherein...

[0215] It further contains nonionic surfactants (C).

[0216] (Appendix 8)

[0217] The synthetic fiber treatment agent as described in Appendix 7, wherein...

[0218] The aforementioned nonionic surfactant (C) comprises a compound (C1) formed by the addition of an epoxide to a primary organic amine.

[0219] (Appendix 9)

[0220] A synthetic fiber, characterized in that:

[0221] The synthetic fiber treatment agent is attached with any one of the appendices 1 to 8.

[0222] (Appendix 10)

[0223] A method for manufacturing a synthetic fiber treatment agent, comprising manufacturing the synthetic fiber treatment agent as described in any one of Appendices 1 to 8, characterized in that,

[0224] The filling rate calculated from the following formula (1) at atmospheric pressure and 25°C is set to be 60% or more and 100% or less.

[0225] [Number 3]

[0226]

[0227] (Appendix 11)

[0228] A treatment agent for synthetic fibers, comprising an ester compound, characterized in that,

[0229] The concentrations of Cu ions and Fe ions in the above-mentioned synthetic fiber treatment agent are both below 50 ppm.

[0230] (Appendix 12)

[0231] A treatment agent for synthetic fibers, characterized in that:

[0232] Esters and sulfonic acid compounds formed by Guerbert alcohol with 24 or more but less than 32 carbon atoms and thiodipropionic acid.

[0233] (Appendix 13)

[0234] A treatment agent for synthetic fibers, comprising an ester compound, characterized in that,

[0235] The peroxide value detected by the above-mentioned synthetic fiber treatment agent was below 100 meq / kg.

[0236] It may contain free radical scavengers or metal deactivators.

[0237] (Appendix 14)

[0238] A treatment agent for synthetic fibers, comprising an ester compound, characterized in that,

[0239] The peroxide value detected by the above-mentioned synthetic fiber treatment agent was below 100 meq / kg.

[0240] The iodine value is between 10 meq / kg and 60 meq / kg.

[0241] (Appendix 15)

[0242] A treatment agent for synthetic fibers, comprising an ester compound, characterized in that,

[0243] The above ester compounds include thiodipropionate.

[0244] The concentrations of Cu ions and Fe ions in the above-mentioned synthetic fiber treatment agent are both below 50 ppm.

[0245] (Appendix 16)

[0246] A treatment agent for synthetic fibers, comprising an ester compound (A), characterized in that,

[0247] The aforementioned ester compound (A) includes ester compounds (A1) that have thioether bonds in their molecules.

[0248] The above-mentioned synthetic fiber treatment agent contains an ester compound (A1) having a thioether bond in the above-mentioned molecule at a proportion of 0.5% to 5% by mass.

[0249] The concentrations of Cu ions and Fe ions in the above-mentioned synthetic fiber treatment agent are both below 50 ppm.

Claims

1. A synthetic fiber treatment agent, which is a synthetic fiber treatment agent used in a spinning or drawing step, containing an ester compound (A), characterized in that, a peroxide value of 100 meq / kg or less is detected from the above synthetic fiber treatment agent, and further contains a nonionic surfactant (C), the above ester compound (A) contains at least one of an ester compound (Al) having a sulfide bond in the molecule and a complete ester compound (A2) formed from a polyhydric alcohol of three or more and four or less and a fatty acid.

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

3. The synthetic fiber treatment agent according to claim 1, wherein, and further contains an ionic surfactant (B).

4. The synthetic fiber treatment agent according to claim 3, wherein, the above ionic surfactant (B) contains a sulfonic acid compound (Bl).

5. The synthetic fiber treatment agent according to claim 4, wherein, the above nonionic surfactant (C) contains a compound (Cl) obtained by adding a primary organic amine to an alkylene oxide.

6. A synthetic fiber characterized by: having attached thereto the synthetic fiber treatment agent according to any one of claims 1 to 5.

7. A method of producing a synthetic fiber treatment agent, which produces the synthetic fiber treatment agent according to any one of claims 1 to 6, characterized by, setting a packing rate calculated from the following formula (1) at 25°C under atmospheric pressure to 60% by volume or more and 100% by volume or less, [Formula 1] Packing rate (%) = 100 - (100 - 100 x (density of the synthetic fiber treatment agent / density of water)) 。

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