Treatment agent for elastic fibers and its use

Abstract

To provide: a treatment agent for elastic fiber excellent in both preventing fiber conglutination over time under high temperature storage of wound yarn body and preventing disordered winding in an outer layer; and elastic fiber to which the treatment agent has been added.SOLUTION: The treatment agent for elastic fiber contains a hydrocarbon oil (A), where the weight percentage of a naphthenic component in the hydrocarbon oil (A) is greater than 0 wt.% and less than or equal to 13 wt.%. The elastic fiber is obtained by adding the treatment agent for elastic fiber. Preferably, the hydrocarbon oil (A) contains a Fischer-Tropsch synthetic oil.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a treatment agent for elastic fibers and its use. [Background technology]

[0002] In the spinning process, elastic fibers are treated with a treatment agent and then wound into a cheese shape to form a wound body (hereinafter sometimes referred to as cheese). Elastic fibers are viscoelastic and therefore prone to sticking. In particular, in wound bodies that have aged, sticking progresses over time due to the pressure applied during winding. Therefore, when using elastic fiber wound bodies, unwinding becomes poor over time, causing thread breakage. To improve this unwinding problem, various treatment agents for elastic fibers have been developed. For example, Patent Document 1 describes a treatment agent for elastic fibers containing a silicone resin (MQ resin), and Patent Document 2 describes a treatment agent for elastic fibers containing a carboxyamide-modified silicone that suppresses aggregation and sedimentation of magnesium salts of higher fatty acids. Furthermore, Patent Document 3 describes a treatment agent for elastic fibers that contains a metal salt of a higher fatty acid that has an average particle diameter of 0.01 to 5 μm and is needle-shaped. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 09-078460 [Patent Document 2] Japanese Patent Application Publication No. 11-12950 [Patent Document 3] Japanese Patent Application Laid-Open No. 2005-179874 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the treatment agents for elastic fibers described in these prior arts are excellent in preventing fibers from sticking together after aging of the wound yarn, the reducing effect of the treatment agents on the friction between fibers can sometimes cause poor unwinding, such as the outer layer of the wound yarn becoming unwound. In other words, there is a trade-off between the ability to prevent sticking of the wound yarn after aging and the ability to prevent the outer layer from becoming unwound, in that prioritizing one results in a deterioration of the other. Furthermore, even if there are no problems with preventing the wound body from sticking over time under normal storage conditions, there have been cases where the wound body has stuck more and become unwindable when it has been left to stand for a long time at high temperatures during summer or when transported by ship. In other words, in the past, the actual situation was that a treatment agent for elastic fibers that could be applied had to strike a balance between preventing sticking over time and preventing the wound body from becoming unwound, and no treatment agent for elastic fibers that satisfied both requirements had been obtained.

[0005] Therefore, an object of the present invention is to provide a processing agent for elastic fibers and a method for producing elastic fibers which cause little change in the unwinding properties of elastic fibers over time when stored at high temperatures and at the same time have excellent properties for preventing the wound body from becoming unwound. [Means for solving the problem]

[0006] As a result of extensive research, the present inventors have found that the above problems can be solved by a treatment agent for elastic fibers containing a specific hydrocarbon oil (A), and have arrived at the present invention. That is, the treatment agent for elastic fibers of the present invention is a treatment agent for elastic fibers containing a hydrocarbon oil (A), in which the weight proportion of naphthene components in the hydrocarbon oil (A) is more than 0% by weight and 13% by weight or less.

[0007] The hydrocarbon oil (A) preferably contains a Fischer-Tropsch synthetic oil. The treatment agent preferably further contains silicone oil (B). The treating agent preferably further contains an organic phosphate ester (D). The elastic fiber of the present invention is obtained by applying the above-mentioned treatment agent to the elastic fiber body. The method for producing elastic fibers of the present invention is a method for producing elastic fibers, which includes a step of applying the above-mentioned treatment agent to an elastic fiber body. [Effects of the Invention]

[0008] The elastic fiber to which the treating agent for elastic fiber of the present invention has been applied shows little change over time in unwinding properties when stored at high temperatures, and at the same time has excellent properties for preventing the wound yarn from becoming unwound. The elastic fiber produced by the method for producing an elastic fiber of the present invention shows little change over time in unwinding properties when stored at high temperatures, and at the same time, has excellent properties for preventing the wound body from collapsing. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 4 is a schematic diagram illustrating a measurement method for evaluating the unwinding speed ratio. [Figure 2] FIG. 2 is a schematic diagram illustrating a method for measuring interfiber friction. DETAILED DESCRIPTION OF THE INVENTION

[0010] The treating agent for elastic fibers of the present invention will be described in detail below.

[0011] [Hydrocarbon oil (A)] The treatment agent for elastic fibers of the present invention essentially contains a hydrocarbon oil (A), which represents the sum of all hydrocarbons contained in the treatment agent for elastic fibers. The hydrocarbon oil (A) contains a specific weight ratio of naphthenic components, and therefore exhibits excellent unwinding properties and prevents the wound body from collapsing during high-temperature storage. On the other hand, in the treatment agents for elastic fibers other than those of the present invention, the hydrocarbon oil, which is the sum of all the hydrocarbons contained in the treatment agent, does not contain naphthene components in a specific weight ratio, and therefore, it is not possible to achieve at least one of the excellent unwinding properties and the ability to prevent the wound body from collapsing under high-temperature storage.

[0012] Although the reason why the use of hydrocarbon oil (A) containing a specific weight percentage of naphthenic components can exhibit excellent unwinding properties and prevention of wound body collapse during high-temperature storage is not clear, it is believed that when hydrocarbon oil (A) containing a specific range of naphthenic components is applied to elastic fiber, a strong oil film is formed on the outermost layer of the elastic fiber, preventing the entire treating agent from migrating between the outer and inner layers of the wound body over time or penetrating into the fiber when stretched during processing, thereby exhibiting excellent effects in unwinding properties and prevention of wound body collapse. Moreover, the "oil" in hydrocarbon oil (A) in this application means a smoothing component and does not particularly limit its state.

[0013] The weight proportion of naphthenic components in the hydrocarbon oil (A) used in the present invention is more than 0% by weight and not more than 13% by weight. The upper limit of this weight proportion is more preferably not more than 10% by weight, even more preferably not more than 9% by weight, particularly preferably not more than 8% by weight, and most preferably not more than 7% by weight. On the other hand, the lower limit of this weight proportion is more preferably not less than 1% by weight, even more preferably not less than 3% by weight, particularly preferably not less than 5% by weight, and most preferably not less than 6% by weight. If the naphthenic component is 13% by weight or more, the entire treating agent may migrate between the outer and inner layers of the wound fiber over time, or the treating agent may penetrate into the interior of the fiber during stretching during processing, making it impossible to exhibit excellent unwinding properties. If the naphthenic component is 0% by weight, the stability of the treating agent tends to deteriorate.

[0014] The hydrocarbon oil (A) used in the present invention may be a mixture of two or more hydrocarbon oils having a naphthenic component weight ratio in the range of more than 0% and not more than 13% by weight, or may contain a hydrocarbon oil having a naphthenic component weight ratio outside the range of more than 0% and not more than 13% by weight. In short, even when a mixture of multiple hydrocarbon oils is used, it is sufficient that the naphthenic component weight ratio of the entire hydrocarbon oil (A) contained in the treatment agent is adjusted to a range of more than 0% and not more than 13% by weight.

[0015] The weight percentage of the paraffin component in the hydrocarbon oil (A) used in the present invention is not particularly limited, but is preferably 87 to 99.9% by weight. When the weight percentage is within the above range, the treatment agent is prevented from penetrating into the interior of the fiber at high temperatures and remains efficiently on the fiber surface, thereby suppressing the change in reelability over time during high-temperature storage. The upper limit of the weight percentage is more preferably 99% by weight, even more preferably 98% by weight, and particularly preferably 97% by weight. Meanwhile, the lower limit of the weight percentage is more preferably 90% by weight, even more preferably 91% by weight, and particularly preferably 92% by weight.

[0016] The weight percentage of the aromatic component in the hydrocarbon oil (A) used in the present invention is not particularly limited, but is preferably 1% by weight or less. When the weight percentage is within the above range, fiber deterioration tends to be suppressed. The upper limit of the weight percentage is more preferably 0.5% by weight, even more preferably 0.4% by weight, and particularly preferably 0.3% by weight.

[0017] In the present invention, the weight proportions of naphthene components, paraffin components and aromatic components contained in the hydrocarbon oil (A) are determined by the ring analysis method specified in ASTM D3238. N %, C p %, C A The value is in %.

[0018] The kinematic viscosity at 40°C of the hydrocarbon oil (A) used in the present invention is not particularly limited, but is preferably 5 to 40 mm 2 The lower limit of the kinematic viscosity of the hydrocarbon oil (A) at 40°C is more preferably 6 mm / s. 2 / s, more preferably 7 mm 2 / s, particularly preferably 8 mm 2 On the other hand, the upper limit of the weight ratio is more preferably 30 mm 2 / s, more preferably 25 mm 2 / s, particularly preferably 20 mm 2 / s. The kinematic viscosity of the hydrocarbon oil (A) is 5.0 mm 2If it is less than 40mm / s, the oil film strength will be too low and it may not be possible to suppress the change in unwinding performance over time. 2 If the kinematic viscosity is higher than 1 / s, the compatibility with other components of the treatment agent will be poor, and it may be impossible to suppress the change in unwinding performance over time. The kinematic viscosity of the hydrocarbon oil (A) is measured in accordance with JIS K 2283.

[0019] The hydrocarbon oil (A) used in the present invention is not particularly limited as long as the weight proportion of naphthenic components is more than 0% and not more than 13% by weight, but it preferably contains Fischer-Tropsch synthetic oil (hereinafter sometimes referred to as FT synthetic oil) and / or mineral oil, and more preferably contains Fischer-Tropsch synthetic oil.

[0020] FT synthetic oils are produced by converting natural gas, coal, or biomass into synthetic gas, which is then converted into wax using the Fischer-Tropsch process, and then further converted into lubricating oil through hydroisomerization and dewaxing processes. Those derived from natural gas are called GTL (gas-to-liquid), those derived from coal are called CTL (coal-to-liquid), and those derived from biomass are called BTL (biomass-to-liquid). These oils are characterized by a very low naphthenic content of 0-10% by weight. There are no particular limitations on FT synthetic oils, but examples include Shell Lubricants' XHVI 3, Shell Lubricants' XHVI 4, Shell Lubricants' XHVI 5.2, and Shell Lubricants' XHVI 8. FT synthetic oils may be used alone or in combination.

[0021] The mineral oil is not particularly limited, and examples thereof include Semtol 40 OIL (trade name) manufactured by Sonneborn, Carnation (trade name) manufactured by Sonneborn, Cosmo Pure Spin D (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Spin E (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Spin RC (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Spin RB (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Neutral 100 (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Neutral 150 (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Neutral 350 (trade name) manufactured by Cosmo Oil Lubricants Co., Ltd., and Cosmo Oil Lubricants Co., Ltd. Cosmo White P200 (product name) manufactured by RICANTS Co., Ltd., Cosmo White P260 (product name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo White P350P (product name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Safety 10 (product name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Safety 22 (product name) manufactured by Cosmo Oil Lubricants Co., Ltd., Cosmo Pure Safety 32 (product name) manufactured by FUJI KOSAN Co., Ltd., FUKKOLL NT-60 (product name) manufactured by FUJI KOSAN Co., Ltd., FUKKOLL NT-100 (product name) manufactured by S-OIL Co., Ltd., Ultra-S (product name) 2, S-OIL Corporation's product name Ultra-S 3, S-OIL Corporation's product name Ultra-S 4, S-OIL Corporation's product name Ultra-S 6, SK Lubricants Corporation's product name YUBASE 3, SK Lubricants Corporation's product name YUBASE 4, SK Lubricants Corporation's product name YUBASE 4 Plus, SK Lubricants Corporation's product name YUBASE 6, SK Lubricants Corporation's product name YUBASE 6 Plus, SK Lubricants Corporation's product name YUBASE 6J, SK Lubricants Corporation's product name YUBASE 8, SK Lubricants Corporation's product name YUBASE 8J, Idemitsu Kosan Co., Ltd.'s product name Diana Fresia W8, Idemitsu Kosan Co., Ltd.'s product name Diana Fresia W32, Idemitsu Kosan Co., Ltd.'s product name Diana Fresia G9, Idemitsu Kosan Co., Ltd.'s product name Diana Fresia K8, Idemitsu Kosan Co., Ltd.'s product name Diana FresiaExamples of suitable mineral oils include machine oils, spindle oils, and liquid paraffins such as S32 (trade name: Krystal N72 manufactured by ExxonMobil Corporation), SUN 60N (trade name: SUN 60N manufactured by Nippon Sun Oil Co., Ltd.), Liquid Paraffin 40S (manufactured by Sanko Chemical Industry Co., Ltd.), Liquid Paraffin RCM (manufactured by Sanko Chemical Industry Co., Ltd.), Liquid Paraffin 80S (manufactured by Sanko Chemical Industry Co., Ltd.), and Liquid Paraffin 100S (manufactured by Sanko Chemical Industry Co., Ltd.). Among these, liquid paraffin is preferred as the mineral oil because it generates little odor. One or more types of mineral oils may be used in combination.

[0022] When the hydrocarbon oil (A) contains an FT synthetic oil and / or a mineral oil, the total weight percentage of the FT synthetic oil and the mineral oil in the hydrocarbon oil (A) is not particularly limited, but is preferably 90 to 99% by weight. When the weight percentage is within the above range, changes in reelability during high-temperature storage tend to be further suppressed. The upper limit of the weight percentage is more preferably 98% by weight, even more preferably 97% by weight, and particularly preferably 96% by weight. Meanwhile, the lower limit of the weight percentage is more preferably 91% by weight, even more preferably 92% by weight, and particularly preferably 93% by weight.

[0023] When FT synthetic oil and mineral oil are used in combination, there are no particular limitations on the blend ratio, but the weight ratio of FT synthetic oil to mineral oil is preferably 1 / 10 to 1000 / 1. When the weight ratio is within the aforementioned range, penetration into the interior of the fiber is inhibited and the oil remains efficiently on the fiber surface, which tends to inhibit changes in rewindability over time during high-temperature storage. The upper limit of the weight ratio is more preferably 500 / 1, even more preferably 100 / 1, and particularly preferably 50 / 1. Meanwhile, the lower limit of the weight ratio is more preferably 1 / 9, even more preferably 1 / 8, and particularly preferably 1 / 7.

[0024] Poly-α-olefins can also be suitably selected as the hydrocarbon oil (A). Poly-α-olefins are compounds obtained by polymerizing α-olefins. The kinematic viscosity of poly-α-olefins at 40°C is 10 to 100 mm 2 / s, preferably 15 to 70 mm 2 / s, and more preferably 15 to 50 mm2 The kinematic viscosity of the poly-α-olefin compound is measured in accordance with JIS K 2283. 2 If it is less than 100mm / s, the oil film strength will be too low and it will not be possible to suppress the change in unwinding performance over time. 2 If it is greater than / s, the compatibility with other components of the treatment agent will be poor, resulting in a decrease in smoothness, and furthermore, weak adhesion will appear, making it impossible to suppress the change in releasability over time.

[0025] The poly-α-olefin is a polymer of an α-olefin, and is preferably a trimer to octamer of an α-olefin having a carbon number of 6 to 18, which satisfies the above kinematic viscosity at 40°C. For example, the poly-α-olefin mainly contains a trimer to octamer of α-decene (having 10 carbon atoms) or a trimer to octamer of α-dodecene (having 12 carbon atoms), as well as dimers and pentamers or higher thereof. A suitable example of producing poly-α-olefin is to synthesize an α-olefin having 6 to 18 carbon atoms by oligomerization of ethylene or thermal decomposition of wax, and then polymerize and hydrogenate 3 to 8 units of this α-olefin. The average number of carbon atoms per molecule of the poly-α-olefin is not particularly limited as long as it is within the above-mentioned range of kinematic viscosity at 40° C., but is preferably 18-150, more preferably 24-140, and even more preferably 30-100.

[0026] When the hydrocarbon oil (A) contains a poly-α-olefin, the weight percentage of the poly-α-olefin in the hydrocarbon oil (A) is not particularly limited, but is preferably 1 to 10% by weight. If the weight percentage is outside the above range, compatibility with other components of the treatment agent may be poor, making it impossible to suppress changes in rewinding performance over time. The upper limit of the weight percentage is more preferably 9% by weight, even more preferably 8% by weight, and particularly preferably 7% by weight. On the other hand, the lower limit of the weight percentage is more preferably 2% by weight, even more preferably 3% by weight, and particularly preferably 4% by weight.

[0027] The poly-alphaolefin is not particularly limited, and examples thereof include Nippon Steel & Sumikin Chemical Co., Ltd., which has a trade name of PAO201; Nippon Steel & Sumikin Chemical Co., Ltd., which has a trade name of PAO401; Nippon Steel & Sumikin Chemical Co., Ltd., which has a trade name of PAO601; Nippon Steel & Sumikin Chemical Co., Ltd., which has a trade name of PAO801; Lion Specialty Chemicals Co., Ltd., which has a trade name of Lipolube 40; Lion Specialty Chemicals Co., Ltd., which has a trade name of Lipolube 60; and Lion Specialty Chemicals Co., Ltd., which has a trade name of Lipolube 80.

[0028] The hydrocarbon oil (A) may contain normal paraffin, alkylnaphthalene, etc. in addition to the above-mentioned FT synthetic oil, mineral oil, and poly-α-olefin.

[0029] [Silicone oil (B)] The treatment agent for elastic fibers of the present invention may further contain a silicone oil (B). When used in combination with the hydrocarbon oil (A), the silicone oil (B) has the effect of further suppressing changes in unwinding properties over time during high-temperature storage. Although it is not clear why the inclusion of silicone oil (B) is more effective in inhibiting changes in unwinding properties over time when stored at high temperatures, it is believed that the inclusion of silicone oil (B) improves the uniform adhesion of the treatment agent to the elastic fibers, thereby further inhibiting changes in unwinding properties over time when stored at high temperatures.

[0030] The silicone oil (B) used in the present invention is not particularly limited, and examples thereof include products manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-10cs, manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-20cs, manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-50cs, manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-100cs, manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-1000cs, manufactured by Shin-Etsu Chemical Co., Ltd. under the trade name KF-96-10,000cs manufactured by Shin-Etsu Chemical Co., Ltd., ... Momentive Performance Materials, Inc. trade name TSF451-20, Momentive Performance Materials, Inc. trade name TSF451-30, Momentive Performance Materials, Inc. trade name TSF451-50, Momentive Performance Materials, Inc. trade name TSF451-100, Momentive Performance Materials, Inc. trade name TSF451-1000, Momentive Performance Materials, Inc. trade name TSF451-1M, Dow Corning Toray Co., Ltd. trade name SH200-10CS, Dow Corning Toray Co., Ltd. trade name SH200-20CS, Dow Corning Toray Co., Ltd. trade name SH200-50CS, Dow Corning Toray Co., Ltd. trade name SH510-100CS, Wacker Asahi Kasei Silicone Co., Ltd. trade name WACKER Examples of suitable silicone oils include polydimethylsiloxanes, polyalkylsiloxanes, polyalkylphenylsiloxanes, and methylhydrogen silicone oils, such as SILICONE FLUID AK10, Wacker Asahi Kasei Silicone Co., Ltd.'s WACKER SILICONE FLUID AK20, and Wacker Asahi Kasei Silicone Co., Ltd.'s WACKER SILICONE FLUID AK50. Silicone oil (B) may be used alone or in combination with two or more other types. It may also contain unreacted silanol groups, unreacted halogen groups, polymerization catalysts, cyclic siloxanes, and the like, derived from the raw materials.

[0031] The viscosity of silicone oil (B) at 20°C is 5 to 30 mm 2 / s is preferable, 5 to 25 mm 2 / s is more preferable, 5 to 20 mm 2 / s is more preferable. 2 If the viscosity is less than 30 mm / s, the silicone oil (B) may volatilize. 2 If the concentration exceeds 1 / s, the solubility of other components blended into the treatment agent may be reduced. Siloxane bond (SiOR) of silicone oil (B) a R b :R a and R b and each independently represent an organic group) has an average bonding amount of preferably 3 to 900, more preferably 5 to 500, and even more preferably 7 to 200. a , R b The organic group is a hydrocarbon group having 1 to 24 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group, an isopentyl group, a hexyl group, a cyclopropyl group, a cyclohexyl group, a phenyl group, and a benzyl group, with a methyl group and a phenyl group being particularly preferred.

[0032] [Ester oil (C)] The treating agent for elastic fibers of the present invention may use an ester oil (C) as a base component other than the hydrocarbon oil (A) and silicone oil (B) explained above.

[0033] The ester oil (C) is not particularly limited as long as it is an ester of a monohydric alcohol and a monocarboxylic acid, an ester of a monohydric alcohol and a polycarboxylic acid, or an ester of a polyhydric alcohol and a monocarboxylic acid, and one or more types may be used. As the monohydric alcohol, monohydric aliphatic alcohols, aromatic alcohols, alicyclic alcohols, phenols, etc., as described below, can be used. Among these, monohydric aliphatic alcohols and aromatic alcohols are preferred.

[0034] The monohydric aliphatic alcohol is not particularly limited, and examples thereof include octanol, 2-ethylhexanol, 1-nonanol, 1-decanol, undecyl alcohol, lauryl alcohol, tridecyl alcohol, isotridecyl alcohol, myristyl alcohol, pentadecyl alcohol, 1-hexadecanol, palmitoleic alcohol, 1-heptadecanol, stearyl alcohol, oleyl alcohol, isostearyl alcohol, nonadecyl alcohol, 1-eicosanol, behenyl alcohol, 1-tetracosanol, erucyl alcohol, lignoceryl alcohol, etc. When the monohydric aliphatic alcohol has a branch, there are no particular limitations on the number of branches, branch chain length, or branch position. Examples of aromatic alcohols include phenol and benzyl alcohol. Examples of the alicyclic alcohol include cyclooctanol, cyclododecanol, cyclohexanol, cycloheptanol, cyclopentanol, and menthol.

[0035] The polyhydric alcohol is not particularly limited, and examples thereof include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, cyclohexanediol, glycerin, diglycerin, triglycerin, tetraglycerin, hexaglycerin, decaglycerin, polyglycerin, sorbitol, trimethylolpropane, and pentaerythritol.

[0036] As the monovalent carboxylic acid, monovalent aliphatic carboxylic acids, aromatic carboxylic acids, hydroxycarboxylic acids, etc., which will be described later, can be used. Among these, monovalent aliphatic carboxylic acids and aromatic carboxylic acids are preferred.

[0037] The monocarboxylic acid is not particularly limited, but examples thereof include valeric acid, caproic acid, enanthic acid, caprylic acid, 2-ethylhexyl acid, capric acid, lauric acid, myristic acid, pentadecylic acid, palmitic acid, palmitoleic acid, margaric acid, stearic acid, oleic acid, isostearic acid, vaccenic acid, linoleic acid, linolenic acid, arachidic acid, behenic acid, lignoceric acid, cetyronic acid, and benzoic acid.

[0038] The polycarboxylic acid is not particularly limited, but examples thereof include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, phthalic acid, trimellitic acid, pyromellitic acid, citric acid, and isocitric acid.

[0039] Specific examples of the ester oil (C) are not particularly limited, and include, for example, heptyl valerate, heptyl caproate, octyl caproate, cetyl caprylate, isooctyl laurate, isopropyl myristate, isopropyl palmitate, isostearyl palmitate, butyl stearate, octyl stearate, oleyl laurate, isotridecyl stearate, octyl stearate, isooctyl stearate, tridecyl stearate, isobutyl stearate, methyl oleate, isobutyl oleate, heptyl oleate, oleyl oleate, polyethylene glycol dilaurate, polyethylene glycol dimyristate, polyethylene glycol dioleate, polyethylene glycol distearate, polypropylene glycol dilaurate, polypropylene glycol dimyristate, polypropylene glycol dioleate, and polypropylene glycol distearate. oleate, dicetyl oxalate, diisooctyl malonate, dilauryl succinate, diisodecyl adipate, isononyl adipate, dioctyl adipate, diisooctyl fumarate, diisooctyl phthalate, dioctyl phthalate, dinonyl phthalate, diisodecyl phthalate, diundecyl phthalate, triisooctyl trimellitate, triisobutyl trimellitate, triisodecyl trimellitate, triisostearyl trimellitate, glycerin Examples of the sorbitan isooctyl glycerin, glycerin trilauryl, glycerin trimyristyl, glycerin trioleyl, glycerin tristearyl, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate, sorbitan sesquioleate, sorbitan trilaurate, sorbitan tristearate, and sorbitan tripalmitate.

[0040] [Organophosphate ester (D)] The elastic fiber treating agent of the present invention may further contain an organic phosphate ester (D). When the treating agent contains an organic phosphate ester (D), the weight percentage of the organic phosphate ester (D) in the treating agent is not particularly limited, but is preferably 0.1 to 10% by weight. When the weight percentage of the organic phosphate ester (D) is within the above-mentioned range, changes in reelability during high-temperature storage tend to be further suppressed. The upper limit of the weight percentage is more preferably 5% by weight, even more preferably 3% by weight, and particularly preferably 1% by weight. Meanwhile, the lower limit of the weight percentage is more preferably 0.2% by weight, even more preferably 0.4% by weight, and particularly preferably 0.5% by weight.

[0041] The organic phosphate (D) is not particularly limited as long as it contains at least one hydrocarbon group or oxyalkylene group in the molecule. Examples thereof include hexyl phosphate, octyl phosphate, decyl phosphate, dodecyl phosphate, tetradecyl phosphate, hexadecyl phosphate, octadecyl phosphate, behenyl phosphate, trioctacosanyl phosphate, octadecenyl phosphate, 2-ethylhexyl phosphate, isoheptyl phosphate, isooctyl phosphate, isononyl phosphate, isodecyl phosphate, isoundecyl phosphate, isododecyl phosphate, isotridecyl phosphate, isotetradecyl phosphate, isohexyl phosphate, Examples of organic phosphates include decyl phosphate, isooctadecyl phosphate, t-butyl phosphate, benzyl phosphate, octylphenyl phosphate, cyclohexyl phosphate, 5-mol polyoxyethylene-added hexadecyl ether phosphate, 15-mol polyoxyethylene-added hexadecyl ether phosphate, 7-mol polyoxyethylene-added 3.5-mol polyoxypropylene-added secondary alkyl ether phosphate, 2-mol polyoxyethylene-added 5-mol polyoxypropylene-added dodecyl phosphate, 3-mol polyoxyethylene-added secondary alkyl ether phosphate, 2-mol polyoxyethylene-added dodecyl ether phosphate, 4-mol polyoxyethylene-added phenol phosphate, etc. The organic phosphate may be an alkali metal salt and / or an alkaline earth metal salt.

[0042] [Other ingredients] From the viewpoint of improving the smoothness, unwinding properties, and antistatic properties, and improving the roll shape of cheese, the treating agent for elastic fibers of the present invention may further contain, in addition to the components described above, at least one other component selected from modified silicones, silicone resins, higher alcohols, polyhydric alcohols, organic amines, metal soaps, nonionic surfactants, cationic surfactants, and anionic surfactants. One or more of these other components may be used.

[0043] The modified silicone generally refers to a structure in which at least one reactive (functional) group or non-reactive (functional) group is bonded to at least one of both ends, one end, side chain, or both ends of a polysiloxane such as dimethylsilicone (polydimethylsiloxane).

[0044] More specifically, examples of the modified silicones include alkyl-modified silicones such as modified silicones having a long-chain alkyl group (such as an alkyl group having 6 or more carbon atoms or a 2-phenylpropyl group); ester-modified silicones which are modified silicones having an ester bond; polyether-modified silicones which are modified silicones having a polyoxyalkylene group (such as a polyoxyethylene group, a polyoxypropylene group, or a polyoxyethyleneoxypropylene group); amino-modified silicones which are modified silicones having an aminopropyl group or an N-(2-aminoethyl)aminopropyl group; carbinol-modified silicones which are modified silicones having an alcoholic hydroxyl group; epoxy-modified silicones which are modified silicones having an epoxy group such as a glycidyl group or an alicyclic epoxy group; carboxy-modified silicones which are modified silicones having a carboxyl group; and mercapto-modified silicones which are modified silicones having a mercapto group.

[0045] The silicone resin is an organopolysiloxane resin, meaning a silicone with a three-dimensional crosslinked structure. Silicone resins generally consist of at least one type of structural unit selected from the group consisting of monofunctional structural units (M), difunctional structural units (D), trifunctional structural units (T), and tetrafunctional structural units (Q).

[0046] The silicone resin is not particularly limited, but examples thereof include MQ silicone resin, MQT silicone resin, T silicone resin, DT silicone resin, and the like, and one or more of these may be used in combination.

[0047] The MQ silicone resin may, for example, contain a monofunctional structural unit R a R b R c SiO 1 / 2 (However, R a , R b and R c are both hydrocarbon groups.) and SiO, a tetrafunctional structural unit 4 / 2 Examples of the silicone resin include silicone resins containing the following:

[0048] The MQT silicone resin may, for example, contain a monofunctional structural unit R a R b R c SiO 1 / 2 (However, R a , R b and R c are both hydrocarbon groups.) and SiO, a tetrafunctional structural unit 4 / 2 and a trifunctional building block, RSiO 3 / 2 (wherein R is a hydrocarbon group), and the like.

[0049] The T silicone resin may, for example, be a trifunctional structural unit, RSiO 3 / 2 (where R is a hydrocarbon group) and silicone resins (the terminals of which may be silanol groups or alkoxy groups in addition to hydrocarbon groups).

[0050] The DT silicone resin may, for example, contain a bifunctional structural unit R a R b SiO 2 / 2 (However, R a , and R b are both hydrocarbon groups.) and RSiO, a trifunctional structural unit 3 / 2 (wherein R is a hydrocarbon group).

[0051] R, R a , R b and R cThe hydrocarbon group is a hydrocarbon group having 1 to 24 carbon atoms, and examples thereof include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, a pentyl group, an isopentyl group, a hexyl group, a cyclopropyl group, a cyclohexyl group, a phenyl group, and a benzyl group. Of these, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a phenyl group are particularly preferred.

[0052] When a silicone resin is contained, the blending ratio of the silicone resin to the entire treatment agent is preferably 0.1 to 9% by weight, more preferably 0.2 to 5% by weight, and even more preferably 0.3 to 3% by weight. If the blending ratio is less than 0.1% by weight, the effect of improving anti-sticking properties by adding the silicone resin may not be sufficiently obtained. If the blending ratio is more than 9% by weight, although anti-sticking properties are excellent, the outer layer may easily become unwound.

[0053] The higher alcohol is not particularly limited, and examples thereof include linear and / or branched alcohols having 6 to 30 carbon atoms. Specific examples thereof include linear alcohols such as hexanol, heptanol, octanol, nonanol, decanol, undecanol, dodecanol, tridecanol, tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eicosanol, heneicosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, and triacosanol; 2-ethylhexanol, 2-propylheptanol, 2-butyloctanol, 1-methylheptadecanol, 2-hexyloctanol, 1-hexylheptanol, and isodecanol. branched alkanols such as hexenol, isotridecanol, and 3,5,5-trimethylhexanol; straight-chain alkenols such as hexenol, heptenol, octenol, nonenol, decenol, undecenol, dodecenol, tridecenol, tetradecenol, pentadecenol, hexadecenol, pentadecenol, hexadecenol, heptadecenol, octadecenol, nonadecenol, eisenol, docosenol, tetracosenol, pentacosenol, hexacosenol, heptacosenol, octacosenol, nonacosenol, and triaconsenol; and branched alkenols such as isohexenol, 2-ethylhexenol, isotridecenol, 1-methylheptadecenol, 1-hexylheptenol, isotridecenol, and isooctadecenol.

[0054] Specific examples of the polyhydric alcohol include glycerin, diglycerin, sorbitan, erythritol, pentaerythritol, trimethylolpropane, sorbitol, and ditrimethylolpropane.

[0055] The organic amine is not particularly limited as long as it contains at least one hydrocarbon group or oxyalkylene group in the molecule, and examples thereof include laurylamine, myristylamine, cetylamine, stearylamine, oleylamine, diethylamine, dioctylamine, distearylamine, methylstearylamine, polyoxypropylene-added laurylamine, polyoxyethylene-added laurylamine, polyoxyethylene-added stearylamine, polyoxyethylene-added oleylamine, monoethanolamine, diethylethanolamine, dibutylethanolamine, triethanolamine, laurylethanolamine, trioctylamine, dimethyllaurylamine, dimethylmyristylamine, and dimethylstearylamine.

[0056] Examples of the metal soap include monovalent, divalent, and trivalent metal salts of fatty acids having 8 to 22 carbon atoms. Examples of the metal soap include calcium laurate, calcium palmitate, barium myristate, magnesium myristate, magnesium palmitate, magnesium laurate, magnesium stearate, magnesium 2-ethylhexylate, zinc behenate, aluminum tribehenate, calcium stearate, calcium 2-ethylhexylate, aluminum stearate, aluminum palmitate, barium stearate, zinc caprate, and zinc stearate. These metal soaps may be used alone or in combination.

[0057] The nonionic surfactant is not particularly limited, and examples thereof include polyhydric alcohols such as polyoxyalkylene alkyl ethers having an alkyl group having 8 to 22 carbon atoms (the oxyalkylene is 1 to 20 moles, the oxyalkylene is oxyethylene and / or oxypropylene, and is random and / or block), sorbitan fatty acid esters, and oxyalkylene adducts of sorbitan fatty acid esters (the oxyalkylene is 1 to 20 moles, the oxyalkylene is oxyethylene and / or oxypropylene, and is random and / or block). Examples of suitable nonionic surfactants include alkylene oxide adducts of alkylphenols, alkylphenols having an alkyl group with 6 to 22 carbon atoms, oxyalkylene adducts of alkylphenols having an alkyl group with 6 to 22 carbon atoms (wherein the oxyalkylene is 1 to 20 moles, the oxyalkylene is oxyethylene and / or oxypropylene, and is random and / or block), and fatty acid polyoxyalkylene glycol esters (wherein the oxyalkylene is 1 to 20 moles, the oxyalkylene is oxyethylene and / or oxypropylene, and is random and / or block). These nonionic surfactants may be used singly or in combination of two or more kinds.

[0058] The cationic surfactant is not particularly limited, but examples thereof include the organic amines or their salts, and quaternary ammonium salts. Specific examples of quaternary ammonium salts include didecyldimethylammonium salt, decyltrimethylammonium salt, dioctyldimethylammonium salt, and octyltrimethylammonium salt. These cationic surfactants may be used alone or in combination.

[0059] The anionic surfactant is not particularly limited, but examples thereof include alkanesulfonic acids and / or salts thereof, dialkyl sulfosuccinic acids and / or salts thereof, alkylbenzenesulfonic acids and / or salts thereof, alkylnaphthalenesulfonic acids and / or salts thereof, alkyl sulfates and / or salts thereof, polyoxyethylene alkyl ether sulfates and / or salts thereof, and polyoxyethylene alkyl ether acetates and / or salts thereof. Specific examples include alkanesulfonic acids and / or salts thereof having an alkyl group containing 6 to 22 carbon atoms, dialkyl sulfosuccinates (described below) and / or salts thereof, alkylbenzenesulfonic acids and / or salts thereof having an alkyl group containing 6 to 22 carbon atoms, alkyl sulfates and / or salts thereof having an alkyl group containing 1 to 20 carbon atoms, polyoxyethylene alkyl ether sulfates and / or salts thereof having an alkyl group containing 6 to 22 carbon atoms, and polyoxyethylene alkyl ether acetates and / or salts thereof having an alkyl group containing 6 to 22 carbon atoms. These anionic surfactants may be used alone or in combination.

[0060] [Treatment agent for elastic fibers] The weight percentage of the hydrocarbon oil (A) in the elastic fiber treatment agent of the present invention based on the total weight of the treatment agent is preferably 1 to 99% by weight. If the content is less than 1% by weight, the effect of this component may be small, making it impossible to suppress changes in unwinding performance over time during high-temperature storage. If the content is greater than 99% by weight, the content of other components in the treatment agent will inevitably be too small, resulting in reduced antistatic and other effects. The upper limit of this weight percentage is more preferably 90% by weight, even more preferably 80% by weight, and particularly preferably 70% by weight. On the other hand, the lower limit of this weight percentage is more preferably 10% by weight, even more preferably 15% by weight, and particularly preferably 20% by weight.

[0061] The weight percentage of the silicone oil (B) in the elastic fiber treatment agent of the present invention relative to the entire treatment agent is preferably 0.01 to 50% by weight. The upper limit of this weight percentage is more preferably 40% by weight, even more preferably 30% by weight, and particularly preferably 20% by weight. On the other hand, the lower limit of this weight percentage is more preferably 1% by weight, even more preferably 5% by weight, and particularly preferably 10% by weight. If the silicone oil (B) is less than 0.01% by weight, the effect of improving uniform adhesion may be insufficient. If it is more than 50% by weight, compatibility with other components of the treatment agent may be poor, making it impossible to suppress changes in reelability over time during high-temperature storage.

[0062] The viscosity of the treatment agent for elastic fibers of the present invention at 30°C is not particularly limited, but is preferably 8 to 40 mm 2 / s, and more preferably 9 to 30 mm 2 / s, more preferably 9 to 20 mm 2 / s. If the viscosity is too low, the treatment agent will scatter in mist when the elastic fiber is run through the spinning and post-processing processes, which can soil the surrounding area or be inhaled by workers. If the viscosity is too high, the adhesiveness can cause the yarn to wrap around the running rollers when the elastic fiber is run through the spinning and post-processing processes, resulting in yarn breakage.

[0063] The method for producing the treatment agent for elastic fibers of the present invention is not particularly limited, and known methods can be used. For example, some components may be blended in advance and then mixed with the remaining components, or all components may be mixed at once. Furthermore, when the treatment agent for elastic fibers of the present invention contains a higher fatty acid metal salt, the agent may be produced by mixing an already pulverized higher fatty acid metal salt with a base component, etc., or by mixing the higher fatty acid metal salt with a base component, etc., and pulverizing the mixture to a predetermined average particle size using a conventionally known wet pulverizer.

[0064] [Elastic fiber] The elastic fiber of the present invention is an elastic fiber body to which the treatment agent for elastic fibers of the present invention has been applied. The proportion of the treatment agent for elastic fibers to the entire elastic fiber is not particularly limited, but is preferably 0.1 to 15% by weight, more preferably 0.5 to 10% by weight. The method for applying the treatment agent for elastic fibers of the present invention to the elastic fiber body is not particularly limited, and any known method can be used.

[0065] The elastic fiber (elastic fiber body) of the present invention is an elastic fiber made from polyether-based polyurethane, polyester-based polyurethane, polyether ester elastomer, polyester elastomer, polyethylene elastomer, polyamide elastomer, etc., and its elongation is usually 300% or more.

[0066] The elastic fibers of the present invention include those composed of polyurethane or polyurethane urea, which are prepared by reacting PTMG or polyester diol with an organic diisocyanate and then chain-extending with 1,4-butanediol, ethylenediamine, propylenediamine, pentanediamine, etc. For example, polyurethane urea elastic fibers can be produced by reacting polytetramethylene glycol (PTMG) having a molecular weight of 1,000 to 3,000 with diphenylmethane diisocyanate (MDI) in a PTMG / MDI molar ratio of 1 / 2 to 1 / 1.5 in a solvent such as dimethylacetamide or dimethylformamide, and chain-extending the resulting polyurethane urea polymer with a diamine such as ethylenediamine or propanediamine using dry spinning at a spinning speed of 400 to 1,200 m / min. There are no particular restrictions on the applicable fineness of the elastic fiber body.

[0067] The elastic fiber body of the present invention may contain an inorganic substance such as titanium oxide, magnesium oxide, hydrotalcite, zinc oxide, or a divalent metal soap. Examples of divalent metal soaps include calcium 2-ethylhexylate, calcium stearate, calcium palmitate, magnesium stearate, magnesium palmitate, magnesium laurate, barium stearate, zinc caprate, zinc behenate, and zinc stearate. One or more types of inorganic substances may be used.

[0068] When the elastic fiber body contains an inorganic substance, uniform unwinding may be poor, but by applying the treatment agent of the present invention to the elastic fiber body, uniform unwinding can be improved. Therefore, the treatment agent for elastic fibers of the present invention can be suitably used when the elastic fiber body contains an inorganic substance. The content of the inorganic substance in the elastic fiber body is not particularly limited, but is preferably 0.01 to 5 wt %, more preferably 0.1 to 3 wt %.

[0069] The elastic fiber of the present invention can be used as fabrics by processing yarns such as covered yarns (e.g., CSY, single covered, PLY, and air covered), circular knitting, tricot, etc. These processed yarns and fabrics are also used to impart stretchability to products requiring stretchability, such as stockings, socks, underwear, and swimwear, as well as to outerwear such as jeans and suits for comfort. Recently, they have also been used in disposable diapers. [Example]

[0070] The present invention will be specifically explained below with reference to examples and comparative examples, but the present invention is not limited to these examples. In the following examples, "percent (%)" and "parts" refer to "weight %" and "parts by weight" unless otherwise specified. In the examples and comparative examples, the properties of the elastic fiber treatment agent were evaluated according to the following methods.

[0071] (Unwinding speed ratio) In Figure 1, a cheese (1) made of fibers treated with a treatment agent was set on the unwinding side of the unwinding speed ratio measuring machine, and a paper tube (2) was set on the winding side. After setting the winding speed to a constant speed, rollers (3) and (4) were started simultaneously. In this state, almost no tension was applied to the yarn (5), so the yarn stuck to the cheese and did not separate, and the unwinding point (6) was in the state shown in Figure 1. Since changing the unwinding speed changes the unwinding point (6) of the yarn (5) from the cheese, the unwinding speed was set so that this point coincided with the contact point (7) between the cheese and the roller. The unwinding speed ratio was calculated using the following formula (1). The smaller this value, the better the unwinding performance. Unwinding speed ratio (%) = ((take-up speed - unwinding speed) / unwinding speed) × 100 Formula (1) The unwinding speed ratio after aging at room temperature refers to the unwinding speed ratio after aging cheese for 6 months under conditions of 20°C and 65% RH. The ability to inhibit adhesion over time at room temperature was evaluated using the following index. (index) ◎: Unwinding speed ratio after aging is less than 100, and the difference between before and after aging is less than 30 ○: The unwinding speed ratio after aging is less than 100, and the difference between before and after aging is 30 to less than 50 ×: Unwinding speed ratio after aging is 100 or more, or the difference between before and after aging is 50 or more The unwinding speed ratio after high-temperature aging refers to the unwinding speed ratio of the inner layer of the cheese measured after leaving the cheese in an atmosphere of 50°C and 80% RH for 14 days and then in an atmosphere of 20°C and 50% RH for 24 hours. The ability to inhibit sticking over time at high temperatures was evaluated using the following index. (index) ◎: Unwinding speed ratio after aging is less than 100, and the difference between before and after aging is less than 30 ○: The unwinding speed ratio after aging is less than 100, and the difference between before and after aging is 30 to less than 50 ×: Unwinding speed ratio after aging is 100 or more, or the difference between before and after aging is 50 or more

[0072] (fiber-fiber friction coefficient (F / FμS)) In FIG. 2, a 50-60 cm length of polyurethane elastic fiber monofilament to which a treatment agent has been applied is taken, a load T1 (10) is hung from one end, and the other end is hung on a U-gauge (8) via a roller (9) and pulled at a constant speed (for example, 3 cm / min). The secondary tension T2 at this time is measured with a U-gauge (18), and the interfiber friction coefficient is calculated using the following formula (2): Friction coefficient (F / FμS)=1 / θ·ln(T2 / T1) Equation (2) (In formula (2), θ = 2π, ln = natural logarithm, T1 is 1g per 22dtex) The resistance to unwinding was evaluated according to the following criteria. (index) ○: Coefficient of friction between fibers is 0.22 or more ×: Coefficient of friction between fibers is less than 0.22

[0073] [Examples 1 to 10 and Comparative Examples 1 to 9] (Preparation of spinning solution) Polytetramethylene ether glycol (PTEG) with a number average molecular weight of 2000 was reacted with 4,4'-diphenylmethane diisocyanate in a molar ratio of 1:2, followed by chain extension using a solution of 1,2-diaminopropane in dimethylformamide to obtain a 27% polymer solution in dimethylformamide. The viscosity at 30°C was 1500 mPaS.

[0074] The polyurethane spinning dope was discharged into a 190°C N2 gas stream and dry-spun. During spinning, a treatment agent prepared using the components shown in Tables 2 to 5 (the amounts in the tables are in parts by weight) was applied to the running yarn using an oiling roller at 6% by weight relative to the fiber, and the yarn was then wound onto a bobbin at a speed of 500 m per minute to obtain a 44 dtex monofilament cheese (winding amount 400 g). The evaluation results of the oil agent performance of the obtained cheese are shown in Tables 2 to 5. The components used in Tables 2 to 5 are as follows: Examples 1, 5, 8 and 9 are used as reference examples.

[0075] (hydrocarbon oil) a-1: XHVI 4 (Shell Lubricants) a-2: XHVI 3 (Shell Lubricants) a-3: Diana Fresia W-8 (manufactured by Idemitsu Kosan) a-4: Liquid paraffin RCM (manufactured by Sanko Chemical Industry Co., Ltd.) a-5: YUBASE 3 (SK Lubricants) a-6: PAO401 (Nippon Steel Sumikin Chemical Co., Ltd.)

[0076] (Silicone oil (B)) b-1: TSF451-10 (Momentive Performance, dimethyl silicone 10mm) 2 / s(25℃) b-2: WACKER SILICONE FLUID AK20 (Asahi Kasei Wacker Silicone Co., Ltd., dimethyl silicone 20mm) 2 / s(25℃)

[0077] (Ester oil (C)) c-1: 2-ethylhexyl stearate

[0078] (Organophosphate ester (D)) d-1: Isotridecyl phosphate ester

[0079] (Other ingredients) X-1: Silicone resin (MQ resin) (500mm 2 / s(25℃) X-2: POE-modified silicone X-3: Isostearyl alcohol X-4: Sodium di-2-ethylhexyl sulfosuccinate X-5: Magnesium stearate: average particle size 0.5 μm, needle-shaped (1:5)

[0080] The weight proportions of naphthene components, paraffin components and aromatic components contained in the hydrocarbon oils used in Tables 2 to 5 are as shown in Table 1. The weight proportions of naphthene components, paraffin components and aromatic components shown in Table 1 are determined by the ring analysis method stipulated in ASTM D3238. N %, C p %, C AThe value is in %.

[0081] [Table 1]

[0082] [Table 2]

[0083] [Table 3]

[0084] [Table 4]

[0085] [Table 5]

[0086] As can be seen from Tables 2 to 5, Examples 1 to 10 are treatment agents for elastic fibers containing hydrocarbon oil (A), and the weight ratio of naphthene components in the hydrocarbon oil (A) is greater than 0% by weight and less than 13%, thereby solving the problem of the present application. On the other hand, when the hydrocarbon oil (A) is not contained (Comparative Example 5), or when the weight ratio of naphthenic components in the hydrocarbon oil is not within the range of more than 0% by weight and not more than 13% by weight (Comparative Examples 1 to 4, 6 to 9), at least one of the problems of the present application, namely, the ability to suppress sticking over time and the ability to prevent unwinding under high-temperature storage, cannot be solved. [Explanation of symbols]

[0087] 1 cheese 2. Winding side paper core 3 Rollers 4 rollers 5. Thread unwound from cheese 6 Unraveling point 7 Contact point with roller 8 U Gauge 9 Roller 10 Load

Claims

1. A treatment agent for elastic fibers containing a hydrocarbon oil (A) and a silicone oil (B), wherein the weight ratio of naphthene components in the hydrocarbon oil (A) is greater than 0% by weight and not more than 9.6% by weight, and the weight ratio of the hydrocarbon oil (A) in the treatment agent for elastic fibers is 1 to 99% by weight.

2. The treatment agent for elastic fibers according to claim 1 , wherein the hydrocarbon oil (A) comprises a Fischer-Tropsch synthetic oil.

3. The treatment agent for elastic fibers according to claim 1 or 2, further comprising an organic phosphate ester (D).

4. An elastic fiber obtained by applying the treating agent for elastic fibers according to any one of claims 1 to 3 to an elastic fiber body.

5. A method for producing elastic fibers, comprising a step of applying the treating agent for elastic fibers according to any one of claims 1 to 3 to an elastic fiber body.

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