JPWO2021033558A1 - Treatment agents for elastic fibers and their use - Google Patents

Abstract

Provided are a treatment agent for elastic fibers having excellent anti-scattering properties and antistatic properties, and a method for producing elastic fibers.
A treatment agent for elastic fibers containing at least one silicone (A) selected from a polyether alkyl co-modified silicone (A1) and an aralkyl-modified silicone (A2) and a smoothing agent (B). A treatment agent for elastic fibers, wherein the alkyl group constituting the silicone (A1) has 4 to 30 carbon atoms, and the modified silicone (A2) has a weight average molecular weight of 1000 to 100,000.

Description

The present invention relates to a treatment agent for elastic fibers and elastic fibers to which the treatment agent is applied.

Liquid components such as silicone oil, mineral oil and ester oil are usually used as base components in elastic fiber treatment agents (Patent Document 1). In particular, when spinning fine elastic fiber brands with low single yarn fineness, an oil agent based on a low-viscosity liquid component is used to prevent the yarn from being taken by the rollers and nozzles during refueling and breaking. used. However, with the recent speeding up of the spinning process, the amount of oil scattered during refueling and in the subsequent processes has become remarkable in the conventional treatment agents for elastic fibers, and from the viewpoint of improving the working environment and reducing the amount of treatment agents used. , It was eagerly desired to suppress the amount of oil scattered.
Further, in addition to the above-mentioned problem of oil scattering, in the processing process for increasing the speed, there is a case where thread breakage and deterioration of the quality of the processed product become a problem due to thread swaying due to an increase in the amount of static electricity generated. In particular, small brands are greatly affected by static electricity, so there is a high need to reduce the amount of static electricity generated.

JP-A-2002-3487883

An object of the present invention is to provide a treatment agent for elastic fibers and a method for producing elastic fibers, which are excellent in anti-scattering property and antistatic property.

As a result of diligent studies, the present inventors have found that a treatment agent for elastic fibers containing a specific silicone compound and a smoothing agent can solve the above-mentioned problems.
That is, the treatment agent for elastic fibers of the present invention contains at least one silicone (A) selected from a polyether alkyl co-modified silicone (A1) and an aralkyl-modified silicone (A2), and a smoothing agent (B). It is a treatment agent for elastic fibers containing, and the alkyl group constituting the modified silicone (A1) has 4 to 30 carbon atoms, and the modified silicone (A2) has a weight average molecular weight of 1000 to 100,000.

The kinematic viscosity of the modified silicone (A1) and / or the modified silicone (A2) at 25 ° C. is preferably 5 ^{to 10000 mm 2 / s.}
The weight average molecular weight of the modified silicone (A1) is preferably 1000 to 100,000.
It is preferable that the modified silicone (A1) is represented by the following general formula (1).

（一般式（１）において、
Ｘ^１：一般式（２）で示される有機基。
Ｘ^２：炭素数４〜３０のアルキル基
Ｘ^３：一般式（３）で示される有機基
Ｘ^４：一般式（４）で示される有機基
ａ：０〜１０００の整数
ｂ：１〜１０００の整数
ｃ：１〜１０００の整数
ｄ：０〜１０００の整数
ｅ：０〜１０００の整数
但し、ａ、ｂ、ｃ、ｄ、ｅの結合単位はランダムでもブロックでもよく、結合順序は問わない。）

(In the general formula (1)
X ¹ : An organic group represented by the general formula (2).
X ² : Alkyl group having 4 to 30 carbon atoms X ³ : Organic group represented by the general formula (3) X ⁴ : Organic group represented by the general formula (4) a: An integer of 0 to 1000
b: Integer from 1 to 1000
c: Integer from 1 to 1000
d: An integer from 0 to 1000
e: Integer from 0 to 1000
However, the binding unit of a, b, c, d, and e may be random or block, and the binding order does not matter. )

（但し、一般式（２）において、
Ｒ^１：水素原子、炭素数１〜３０の炭化水素基、又はＲ^２−（ＣＯ）−で示される有機基
Ｒ^２：炭素数１〜３０の炭化水素基
ｆ：０〜２０の整数
ｇ：２〜２００の整数
ｈ：０〜２００の整数
但し、ｇ、ｈの結合単位はランダムでもブロックでもよい）

(However, in the general formula (2),
R ^1: a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, or ^R 2 - (CO) - organic group represented by ^{R 2:} hydrocarbon group having 1 to 30 carbon atoms f: 0 to 20 integer g: Integer from 2 to 200 h: Integer from 0 to 200 However, the combination unit of g and h may be random or block)

（一般式（３）において、Ｒ^３は、炭素数１〜３０アルキル基、アリール基、アラルキル基、フッ素置換アルキル基、アミノ置換アルキル基、カルボキシル置換アルキル基等の非置換又は置換一価炭化水素基、又は前記一般式（２）の有機基である。Ｒ^３は、それぞれ同一であっても異なっていてもよい。）
ｉ：１〜５の整数
ｊ：０〜５００の整数）

(In the general formula (3), R ³ is an unsubstituted or substituted monovalent hydrocarbon such as an alkyl group having 1 to 30 carbon atoms, an aryl group, an aralkyl group, a fluorine-substituted alkyl group, an amino-substituted alkyl group, and a carboxyl-substituted alkyl group. group, or .R ³ is an organic group of the general formula (2) may each be the same or different.)
i: Integer from 1 to 5 j: Integer from 0 to 500)

Ｒ^４：炭素数１〜１０の脂肪族炭化水素基
Ｒ^５：水素原子、又は炭素数１〜５の脂肪族炭化水素基

R ⁴ : An aliphatic hydrocarbon group having 1 to 10 carbon ^{atoms R 5} : A hydrogen atom or an aliphatic hydrocarbon group having 1 to 5 carbon atoms

It is preferable that at least one selected from the a, d and e is an integer of 1 to 1000.
It is preferable that at least two selected from the a, d and e are integers of 1 to 1000.
It is preferable that the a, d and e are integers of 1 to 1000.
The weight ratio of the modified silicone (A1) to the treatment agent is preferably 0.01 to 20% by weight, and the weight ratio of the smoothing agent (B) is preferably 80 to 99.99% by weight.

The elastic fiber of the present invention is obtained by applying the above-mentioned treatment agent for elastic fiber to the elastic fiber main body.

The treatment agent for elastic fibers of the present invention is excellent in anti-scattering property and antistatic property. The elastic fiber of the present invention has excellent antistatic properties.

The schematic diagram explaining the method of measuring static electricity. The schematic diagram explaining the measuring method of the oil agent scattering property.

The treatment agent for elastic fibers of the present invention is characterized by containing a specific silicone compound and a smoothing agent. This will be described in detail below.

[Silicone (A)]
The silicone (A) is at least one selected from the polyether alkyl co-modified silicone (A1) and the aralkyl-modified silicone (A2).

[Polyester alkyl co-modified silicone (A1)]
The polyether alkyl co-modified silicone (A1) is an essential component in the present invention, and when used in combination with a smoothing agent (B) described later, it has an anti-scattering effect.
The alkyl group constituting the polyether alkyl co-modified silicone (A1) has 4 to 30 carbon atoms, preferably 6 to 26, and more preferably 10 to 22. When the number of carbon atoms is 3 or less, the anti-scattering property is lowered, and when the number of carbon atoms exceeds 30, the antistatic property is lowered.

The kinematic viscosity of the polyether alkyl co-modified silicone (A1) at 25 ° C. is preferably 5 to 10000 mm 2 / s, more preferably ^{20 to 8000 mm 2 / s, and 50 to 8000 mm 2 / s, from the viewpoint of excellent anti-scattering property and antistatic property.} 5000 mm ² / s is more preferable.

The weight average molecular weight of the polyether alkyl co-modified silicone (A1) is preferably 1000 to 100,000, more preferably 2000 to 70000, and even more preferably 3000 to 40,000. If the weight average molecular weight is less than 1000, the antistatic property is lowered, and if it exceeds 100,000, the friction characteristics are deteriorated and the cloth quality may be deteriorated. The weight average molecular weight can be determined as a polystyrene-equivalent weight average molecular weight in gel permeation chromatography (GPC) analysis.

The polyether alkyl co-modified silicone (A1) is preferably represented by the above general formula (1) from the viewpoint of excellent anti-scattering property and antistatic property.
X ¹ is an organic group represented by the general formula (2).
X ² is an aliphatic hydrocarbon group having 4 to 30 carbon atoms, and is preferably 6 to 28 carbon atoms, more preferably 8 to 24 carbon atoms, and even more preferably 10 to 22 carbon atoms from the viewpoint of the effect of preventing scattering.
X ³ is an organic group represented by the general formula (3).
X ⁴ is an organic group represented by the general formula (4).
a is an integer of 0 to 1000, and is preferably 1 to 500, more preferably 1 to 200, from the viewpoint of the anti-scattering effect.
b is an integer of 1 to 1000, and is preferably 1 to 400, more preferably 1 to 200, and even more preferably 1 to 100 from the viewpoint of the anti-scattering effect.
c is an integer of 1 to 1000, and is preferably 1 to 500, more preferably 1 to 350, and even more preferably 1 to 200 from the viewpoint of the anti-scattering effect.
d is an integer of 0 to 1000, and from the viewpoint of the anti-scattering effect, an integer of 1 to 500 is preferable, 1 to 350 is more preferable, and 1 to 200 is further preferable.
e is an integer of 0 to 1000, and is preferably 1 to 500, more preferably 1 to 350, and even more preferably 1 to 200 from the viewpoint of the anti-scattering effect.
In the general formula (1), the binding unit of a, b, c, d and e may be random or block, and the binding order does not matter.

In the general formula (2), R ¹ is a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, or an organic group represented by ^{R 2- (CO) −.} From the viewpoint of the shatterproof effect, a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms is preferable, 1 to 18 carbon atoms are more preferable, and 1 to 16 carbon atoms are further preferable.
R ² is a hydrocarbon group having 1 to 30 carbon atoms. From the viewpoint of the shatterproof effect, a hydrocarbon group having 2 to 28 carbon atoms is preferable, a hydrocarbon group having 6 to 24 carbon atoms is more preferable, and a hydrocarbon group having 8 to 20 carbon atoms is further preferable.

In the general formula (3), R ³ is an unsubstituted or substituted monovalent hydrocarbon such as an alkyl group having 1 to 30 carbon atoms, an aryl group, an aralkyl group, a fluorine-substituted alkyl group, an amino-substituted alkyl group, and a carboxyl-substituted alkyl group. A group or an organic group of the general formula (2).
i is an integer of 1 to 5, and i is 2 especially when synthesized from the reaction of a vinyl syroxy group and a SiH group.
j is an integer of 0 to 500, and is preferably 1 to 50 from the viewpoint of the anti-scattering effect.

In the general formula (4), R ⁴ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and from the viewpoint of the effect of preventing scattering, 1 to 8 carbon atoms are preferable, 1 to 6 carbon atoms are more preferable, and carbon atoms are more preferable. Numbers 1 to 4 are more preferable.
R ⁵ is a hydrogen atom or an aliphatic hydrocarbon group having 1 to 5 carbon atoms, and a hydrogen atom or a methyl group is preferable from the viewpoint of the anti-scattering effect.

[Aralkill-modified silicone (A2)]
The aralkyl-modified silicone (A2) is a silicone compound having an aralkyl group in the molecule and has no polyether-modifying group in the molecule. That is, it is different from the modified silicone (A1).
The weight average molecular weight of the aralkyl-modified silicone (A2) is preferably 1000 to 100,000, more preferably 2000 to 70000, and even more preferably 3000 to 40,000. If the weight average molecular weight is less than 1000, the antistatic property is lowered, and if it exceeds 100,000, the friction characteristics are deteriorated and the cloth quality may be deteriorated. The weight average molecular weight can be determined as a polystyrene-equivalent weight average molecular weight in gel permeation chromatography (GPC) analysis.

The kinematic viscosity of the aralkyl-modified silicone (A2) at 25 ° C. is 5 to 10000 mm ² / s, and outside this range, the anti-scattering property and the antistatic property are inferior. When used in combination with the smoothing agent (B) described later, it has an anti-scattering effect.
The kinematic viscosity of the aralkyl-modified silicone (A2) at 25 ° C. is more preferably 20 to 6000 mm ² / s and further preferably ^{50 to 4000 mm 2 / s from the viewpoint of excellent anti-scattering property and antistatic property.}

The aralkyl-modified silicone (A2) is preferably represented by the following general formula (11) from the viewpoint of excellent anti-scattering property and antistatic property.

（一般式（１１）において、
Ｘ^１１：一般式（１２）で示される有機基
Ｘ^１２：炭素数２〜３０の脂肪族炭化水素基
ａ１：０〜１０００の整数
ｂ１：１〜１０００の整数
ｃ１：０〜１０００の整数
但し、ａ１、ｂ１、ｃ１の結合単位はランダムでもブロックでもよく、結合順序は問わない。）

(In the general formula (11)
X ¹¹ : Organic group represented by the general formula (12) X ¹² : Integer of aliphatic hydrocarbon group a1: 0 to 1000 having 2 to 30 carbon atoms b1: Integer of 1-1 to 1000 c1: Integer of 1000 The binding unit of a1, b1, and c1 may be random or block, and the binding order does not matter. )

（一般式（１２）において、
Ｒ^１１：炭素数１〜１０の脂肪族炭化水素基
Ｒ^１２：水素原子、又は炭素数１〜５の脂肪族炭化水素基）

(In the general formula (12)
R ¹¹ : An aliphatic hydrocarbon group having 1 to 10 carbon ^{atoms R 12} : A hydrogen atom or an aliphatic hydrocarbon group having 1 to 5 carbon atoms)

X ¹² is an aliphatic hydrocarbon group having 2 to 30 carbon atoms, and is preferably 3 to 28 carbon atoms, more preferably 7 to 25 carbon atoms, and even more preferably 10 to 22 carbon atoms from the viewpoint of the effect of preventing scattering. ..
a1 is an integer of 0 to 1000, and from the viewpoint of the anti-scattering effect, an integer of 1 to 500 is preferable, 1 to 350 is more preferable, and 1 to 200 is further preferable.
b1 is an integer of 1 to 1000, and is preferably 1 to 500, more preferably 1 to 350, and even more preferably 1 to 200 from the viewpoint of the anti-scattering effect.
c1 is an integer of 0 to 1000, and from the viewpoint of the anti-scattering effect, an integer of 1 to 500 is preferable, 1 to 350 is more preferable, and 1 to 200 is further preferable.
In the general formula (11), the binding unit of a1, b1 and c1 may be random or block, and the binding order does not matter.

In the general formula (12), R ¹¹ is an aliphatic hydrocarbon group having 1 to 10 carbon atoms, and from the viewpoint of the effect of preventing scattering, 1 to 8 carbon atoms are preferable, 1 to 6 carbon atoms are more preferable, and carbon atoms are more preferable. Numbers 1 to 4 are more preferable.
R ¹² is a hydrogen atom or an aliphatic hydrocarbon group having 1 to 5 carbon atoms, and a hydrogen atom or a methyl group is preferable from the viewpoint of the anti-scattering effect.

[Smoothing agent (B)]
The smoothing agent (B) is at least one selected from silicone oil (B1), mineral oil (B2), poly-α-olefin (B3), and ester oil (B4). The smoothing agent (B) is an essential component of the above-mentioned treatment agent for elastic fibers, and is an agent that reduces friction between fibers and metals.

The silicone oil (B1) is a silicone component excluding the polyether alkyl-modified silicone (A1) and the aralkyl-modified silicone (A2).
The silicone oil (B1) is not particularly limited, but for example, the product name KF-96-10cs manufactured by Shin-Etsu Chemical Industry Co., Ltd., the product name KF-96-20cs manufactured by Shin-Etsu Chemical Industry Co., Ltd., and Shin-Etsu Chemical Industry Co., Ltd. Company-made product name KF-96-50cs, Shin-Etsu Chemical Industry Co., Ltd. product name KF-96-100cs, Shin-Etsu Chemical Industry Co., Ltd. product name KF-96-1000cs, Shin-Etsu Chemical Industry Co., Ltd. product name KF-96-10,000cs, product name KF-50-100cs manufactured by Shin-Etsu Chemical Industry Co., Ltd., product name KF-4003 manufactured by Shin-Etsu Chemical Industry Co., Ltd., product name KF-4917 manufactured by Shin-Etsu Chemical Industry Co., Ltd., Momentive -Product name TSF451-5A manufactured by Performance Materials, product name TSF451-10 manufactured by Momentive Performance Materials, product name TSF451-20 manufactured by Momentive Performance Materials, Momentive Performance Materials. Product name TSF451-30 manufactured by Momentive Performance Materials, product name TSF451-50 manufactured by Momentive Performance Materials, product name TSF451-100 manufactured by Momentive Performance Materials, product name manufactured by Momentive Performance Materials. TSF451-1000, product name TSF451-1M manufactured by Momentive Performance Materials, product name SH200-10CS manufactured by Toray Dow Corning Co., Ltd., product name SH200-20CS manufactured by Toray Dow Corning Co., Ltd., Toray Dow Product name SH200-50CS manufactured by Corning Co., Ltd., Product name SH510-100CS manufactured by Toray Dow Corning Co., Ltd., Product name WACKER SILICONE FLUID AK10 manufactured by Asahi Kasei Wacker Silicone Co., Ltd., Product name WACKER SILICONE manufactured by Asahi Kasei Wacker Silicone Co., Ltd. Examples thereof include polydimethylsiloxane, polyalkylsiloxane, polyalkylphenylsiloxane, and the like, which are trade names such as FLUID AK20 and WACKER SILICONE FLUID AK50 manufactured by Asahi Kasei Wacker Silicone Co., Ltd. One kind or two or more kinds may be used together. Further, it may contain an unreacted silanol group derived from a raw material, an unreacted halogen group, a polymerization catalyst, a cyclic siloxane, and the like.

The mineral oil (B2) is not particularly limited, but for example, the trade name Semitor 40 OIL manufactured by Sonneborn, the trade name Carnation manufactured by Sonneborn, the trade name Cosmo Pure Spin D manufactured by Cosmo Petroleum Lubricants Co., Ltd., and Cosmo Petroleum Lubricants Co., Ltd. Product Name Cosmo Pure Spin E, Product Name Cosmo Oil Lubricants Co., Ltd. Product Name Cosmo Pure Spin RC, Cosmo Oil Lubricants Co., Ltd. Product Name Cosmo Pure Spin RB, Cosmo Oil Lubricants Co., Ltd. Product Name Cosmo Neutral 100, Cosmo Petroleum Lubricants Co., Ltd. trade name Cosmo Neutral 150, Cosmo Petroleum Lubricants Co., Ltd. trade name Cosmo Neutral 350, Cosmo Petroleum Lubricants Co., Ltd. trade name Cosmo White P200, Cosmo Petroleum Lubricants Co., Ltd. trade name Cosmo White P260, Product Name Cosmo Petroleum Lubricants Co., Ltd. Product Name Cosmo White P350P, Cosmo Petroleum Lubricants Co., Ltd. Product Name Cosmo Pure Safety 10, Cosmo Oil Lubricants Co., Ltd. Product Name Cosmo Pure Safety 22, Cosmo Oil Lubricants Co., Ltd. Product name Cosmo Pure Safety 32 manufactured by Fuji Kosan Co., Ltd., Product name Fuccole NT-60 manufactured by Fuji Kosan Co., Ltd., Product name Fucol NT-100 manufactured by Fuji Kosan Co., Ltd., Product name Ultra-S 2 manufactured by S-OIL , S-OIL product name Ultra-S 3, S-OIL product name Ultra-S 4, S-OIL product name Ultra-S 6, SK Lubricants product name YUBASE 3, SK Lubricants brand name YUBASE 4, SK Lubricants brand name YUBASE 4 Plus, SK Lubricants brand name YUBASE 6, SK Lubricants brand name YUBASE 6 6J, SK Lubricants brand name YUBASE 8, SK Lubricants brand name YUBASE 8J, Idemitsu Kosan Co., Ltd. brand name Diana Fresia W8, Idemitsu Kosan Co., Ltd. brand name Diana Fresia W32, Idemitsu Kosan Co., Ltd. Product name Diana Fresia G9, Product name Diana Fresia K manufactured by Idemitsu Kosan Co., Ltd. 8. Machine oils such as Diana Fresia S32 manufactured by Idemitsu Kosan Co., Ltd., Cristol N72 manufactured by ExxonMobil, and SUN 60N trade name manufactured by Nippon Sun Oil Co., Ltd., spindle oil, liquid paraffin, etc. can. Among these, liquid paraffin is preferable as the mineral oil because the generation of odor is low. Mineral oil may be used alone or in combination of two or more.

Examples of the poly-α-olefin (B3) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-hexene, 1-octene, 1-nonene, 1-decene, 1-undecene and 1-dodecene. , 1-Tridecene, 1-Tetradecene and the like synthesized from α-olefins. Specifically, the product name PAO201 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., the product name PAO401 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., the product name PAO601 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., the product name PAO801 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd., Lion Specialty Chemicals Co., Ltd. Examples thereof include the product name Liporube 40 manufactured by the company, the product name Liporube 60 manufactured by Lion Specialty Chemicals Co., Ltd., and the product name Liporube 80 manufactured by Lion Specialty Chemicals Co., Ltd.

The ester oil (B4) is not particularly limited as long as it is an ester of a monohydric alcohol and a monovalent carboxylic acid, an ester of a monohydric alcohol and a polyvalent carboxylic acid, or an ester of a polyhydric alcohol and a monovalent carboxylic acid. Instead, one type or two or more types may be used. As the monohydric alcohol, a monohydric aliphatic alcohol, an aromatic alcohol, an alicyclic alcohol, phenols and the like, which will be described later, can be used. Among these, monohydric aliphatic alcohols and aromatic alcohols are preferable.

The monohydric aliphatic alcohol is not particularly limited, but for example, octanol, 2-ethylhexanol, 1-nonanol, 1-decanol, undecyl alcohol, lauryl alcohol, tridecyl alcohol, isotridecyl alcohol, and myristyl alcohol. , Pentadecyl alcohol, 1-hexadecanol, palmitrail alcohol, 1-heptadecanol, stearyl alcohol, oleyl alcohol, isostearyl alcohol, nonadecil alcohol, 1-eicosanol, behenyl alcohol, 1-tetracosanol, elcil alcohol , Lignoceryl alcohol and the like.
Examples of the aromatic alcohol include phenol, benzyl alcohol and the like.
Examples of the alicyclic alcohol include cyclooctanol, cyclododecanol, cyclohexanol, cycloheptanol, cyclopentanol, menthol and the like.

As the monovalent carboxylic acid, a monovalent aliphatic carboxylic acid, an aromatic carboxylic acid, and a hydroxycarboxylic acid, which are also described later, can be used. Among these, monovalent aliphatic carboxylic acids and aromatic carboxylic acids are preferable.

The monovalent carboxylic acid is not particularly limited, but for example, valeric acid, caproic acid, enanthic acid, capric acid, 2-ethylhexic acid, capric acid, lauric acid, myristic acid, pentadecyl acid, palmitic acid and palmitreic acid , Margaric acid, stearic acid, oleic acid, isostearic acid, baxenoic acid, linoleic acid, linolenic acid, arachidic acid, bechenic acid, lignoseric acid, cetyronic acid, benzoic acid and the like.

The polyvalent carboxylic acid is not particularly limited, but for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, fumaric acid, phthalic acid, trimellitic acid, pyromellitic acid, citric acid, isocitrate and the like. Can be mentioned.

The polyhydric alcohol is not particularly limited, but for example, ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol, and the like. 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, cyclohexanediol, glycerin, diglycerin , Triglycerin, tetraglycerin, sorbitol, trimethylolpropane, pentaerythritol and the like.

Specific examples of the ester oil (B4) are not particularly limited, but for example, heptyl valerate, heptyl caproate, octyl caproate, cetyl capryate, isooctyl laurate, isopropyl myristate, isopropyl palmitate, iso palmitate. Stearyl, 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 dimyristylate, Polyethylene dioleate, Polyethylene distearate, Polypropylene dilaurate, Polypropylene dimyristate, Polypropylene dioleate, Polypropylene distearate, Disetyl oxalate, Diisooctyl malonate, Kohaku Dilauryl acid, diisodecyl adipate, isononyl adipate, dioctyl adipate, diisooctyl fumarate, diisooctyl phthalate, dioctyl phthalate, dinonyl phthalate, diisodecyl phthalate, diundecyl phthalate, triisooctyl trimellitic acid, tritrimeric acid Isobutyl, triisodecyl trimellitic acid, triisostearyl trimeriate, glycerin triisooctyl, glycerin trilauryl, glycerin trimyristyl, glycerin trioleyl, glycerin tristearyl, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, Examples thereof include sorbitan monooleate, sorbitan trioleate, sorbitan tristearate, sorbitan sesquioleate, sorbitan trilaurate, sorbitan tristearate, and sorbitan tripalmitate.

[Other component (D)]
In addition to the components described above, the treatment agent for elastic fibers of the present invention contains modified silicone (A1) and other components in addition to the components described above, from the viewpoints of improving the performance of smoothness, fluffiness, antistatic property, and improving the winding shape of cheese. Modified silicones other than modified silicone (A2), silicone resins, higher alcohols, polyhydric alcohols, organic phosphoric acid esters, organic amines, metal soaps, organopolysiloxane resins, nonionic surfactants, cationic surfactants, anionic surfactants It may further contain at least one other component selected from. As the other component, one kind or two or more kinds may be used.

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

More specifically, the modified silicone is an alkyl-modified silicone such as a modified silicone having a long-chain alkyl group (alkyl group having 6 or more carbon atoms, 2-phenylpropyl group, etc.); an ester which is a modified silicone having an ester bond. Modified silicone; polyether-modified silicone which is a modified silicone having a polyoxyalkylene group (for example, polyoxyethylene group, polyoxypropylene group, polyoxyethyleneoxypropylene group, etc.); aminopropyl group or N- (2-amino) Ethyl) Amino-modified silicone, which is a modified silicone having an aminopropyl group, etc .; Carbinol-modified silicone, which is a modified silicone having an alcoholic hydroxyl group; Epoxide, which is a modified silicone having an epoxy group such as a glycidyl group or an alicyclic epoxy group. Modified silicones; modified silicones having a carboxyl group, carboxy-modified silicones; modified silicones having a mercapto group, such as mercapto-modified silicones.

The silicone resin is an organopolysiloxane resin and means a silicone having a three-dimensional crosslinked structure. Silicone resins generally have at least one configuration selected from monofunctional building blocks (M), bifunctional building blocks (D), trifunctional building blocks (T) and tetrafunctional building blocks (Q). It consists of units.

The silicone resin is not particularly limited, and examples thereof include silicone resins such as MQ silicone resin, MQT silicone resin, T silicone resin, and DT silicone resin, and one or more of these may be used. It may be used together.

Examples of the MQ silicone resin include ^Ra R ^b R ^c SiO _1/2 (where ^Ra , R ^b and R ^c are all hydrocarbon groups), which are monofunctional constituent units, and 4 Examples thereof include silicone resins containing _{SiO 4/2} , which is a functional constituent unit.

Examples of the MQT silicone resin include ^Ra R ^b R ^c SiO _1/2 (where ^Ra , R ^b and R ^c are all hydrocarbon groups), which are monofunctional constituent units, and 4 _{Examples thereof include silicone resins containing SiO 4/2} , which is a functional structural unit, and RSiO _3/2, which is a trifunctional structural unit (where R is a hydrocarbon group).

The T-silicone resin includes, for example, _{a silicone resin containing RSiO 3/2} (where R is a hydrocarbon group) which is a trifunctional constituent unit (the terminal thereof is a hydrocarbon group, a silanol group, and an alkoxy. It may be the basis.) Etc. can be mentioned.

Examples of the DT silicone resin include ^Ra R ^b SiO _2/2 (where ^Ra and R ^b are both hydrocarbon groups), which are bifunctional constituent units, and trifunctional constituent units. RSiO _3/2 (where R is a hydrocarbon group) and the like.

The hydrocarbon groups of R, R ^a , R ^b and R ^c are hydrocarbon groups having 1 to 24 carbon atoms, such as a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group and a pentyl group. Examples thereof include an isopentyl group, a hexyl group, a cyclopropyl group, a cyclohexyl group, a phenyl group and a benzyl group, and a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group and a phenyl group are particularly preferable.

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 hexanol, heptanol, octanol, nonaol, decanol, undecanol, dodecanol, and tridecanol. Tetradecanol, pentadecanol, hexadecanol, heptadecanol, octadecanol, nonadecanol, eikosanol, heneikosanol, docosanol, tricosanol, tetracosanol, pentacosanol, hexacosanol, heptacosanol, octacosanol, nonacosanol, and tria Linear alcohols such as cosanol; 2-ethylhexanol, 2-propylheptanol, 2-butyloctanol, 1-methylheptadecanol, 2-hexyloctanol, 1-hexylheptanol, isodecanol, isotridecanol, 3 , 5,5-trimethylhexanol and other branched alkanols; hexenol, heptanol, octanol, nonenol, decenol, undesenol, dodecenol, tridecenol, tetradecenol, pentadecenol, hexadecenol, pentadecenol, hexadecenol, heptadecenol, octadecenol, nonadecenool Straight-chain alcohols such as nor, pentacosenol, hexacosenol, heptacosenol, octacsenol, nonacocenol and triaconsenol; isohexenol, 2-ethylhexenol, isotridecenol, 1-methylheptadecenol, 1-hexylheptanol, iso Examples thereof include branched alcohols such as tridecenol and isooctadecenol.

Specific examples of the polyhydric alcohol include glycerin, diglycerin, sorbitol, erythritol, pentaerythritol, trimethylolpropane, sorbitol, and trimethylolpropane.

The organic phosphate ester is not particularly limited as long as it contains at least one hydrocarbon group or oxyalkylene group in the molecule, but for example, hexyl phosphate ester, octyl phosphate ester, decyl phosphate ester, dodecyl phosphate. Estel, tetradecyl phosphate, hexadecyl phosphate, octadecyl phosphate, behenyl phosphate, trioctakosanyl phosphate, octadecenyl phosphate, 2-ethylhexyl phosphate, isoheptyl phosphate , Isooctyl phosphate, Isononyl phosphate, Isodecyl phosphate, Isoundecyl phosphate, Isododecyl phosphate, Isotridecyl phosphate, Isotetradecyl phosphate, Isohexadecyl phosphate, Iso Octadecyl phosphate, t-butyl phosphate, benzyl phosphate, octylphenyl phosphate, cyclohexyl phosphate, polyoxyethylene 5 molar addition hexadecyl ether phosphate, polyoxyethylene 15 molar addition hexadecyl ether phosphorus Acid ester, polyoxyethylene 7 mol added secondary alkyl ether phosphoric acid ester, polyoxyethylene 2 mol polyoxypropylene 5 mol added dodecyl phosphate, polyoxyethylene 3 mol added secondary alkyl ether phosphoric acid Examples thereof include an ester, a dodecyl ether phosphoric acid ester supplemented with 2 mol of polyoxyethylene, and a phenol phosphate ester added with 4 mol of polyoxyethylene.

The organic amine is not particularly limited as long as it contains at least one hydrocarbon group or oxyalkylene group in the molecule, but for example, laurylamine, myristylamine, cetylamine, stearylamine, oleylamine, diethylamine, dioctylamine, etc. Distearylamine, methylstearylamine, polyoxypropylene-added laurylamine, polyoxyethylene-added laurylamine, polyoxyethylene-added stearylamine, polyoxyethylene-added oleylamine, monoethanolamine, diethylethanolamine, dibutylethanolamine, triethanolamine , Laurylethanolamine, trioctylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylstearylamine and the like.

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

The nonionic surfactant is not particularly limited, but for example, a polyoxyalkylene alkyl ether having an alkyl group having 8 to 22 carbon atoms (oxyalkylene is 1 to 20 mol, oxyalkylene is oxyethylene and / or oxypropylene). Yes, random and / or block), sorbitan fatty acid ester, oxyalkylene adduct of sorbitan fatty acid ester (1-20 mol of oxyalkylene, oxyalkylene is oxyethylene and / or oxypropylene, random and / or block There are alkylene oxide adducts of polyhydric alcohols such as), alkylphenols having an alkyl group having 6 to 22 carbon atoms, and oxyalkylene adducts of alkylphenols having an alkyl group having 6 to 22 carbon atoms (oxyalkylene is 1 to 20 mol). , Oxyalkylene is oxyethylene and / or oxypropylene, random and / or block), fatty acid polyoxyalkylene glycol ester (oxyalkylene is 1 to 20 mol, oxyalkylene is oxyethylene and / or oxypropylene) , Random and / or block) and the like. These nonionic surfactants may be used alone or in combination of two or more.

The cationic surfactant is not particularly limited, and includes, for example, the organic amine or a salt thereof, and a quaternary ammonium salt. Specific examples of the quaternary ammonium salt include didecyldimethylammonium salt, decyltrimethylammonium salt, dioctyldimethylammonium salt, and octyltrimethylammonium salt. These cationic surfactants may be used alone or in combination of two or more.

The anionic surfactant is not particularly limited, but is, for example, alkanesulfonic acid and / or a salt thereof, dialkylsulfosuccinic acid and / or a salt thereof, alkylbenzenesulfonic acid and / or a salt thereof, alkylnaphthalenesulfonic acid and / or a salt thereof. Salts, alkyl sulphates and / or salts thereof, polyoxyethylene alkyl ether sulphates and / or salts thereof, polyoxyethylene alkyl ether acetic acid and / or salts thereof, alkyl phosphoric acid, polyoxyethylene alkyl ether phosphoric acid, or components thereof. There is salt etc. Specifically, alkane sulfonic acid having an alkyl group having 6 to 22 carbon atoms and / or a salt thereof, a dialkyl sulfosuccinic acid ester described later and / or a salt thereof, alkylbenzene sulfonic acid having an alkyl group having 6 to 22 carbon atoms and / or a salt thereof and / Or a salt thereof, an alkyl sulfate having an alkyl group having 1 to 20 carbon atoms and / or a salt thereof, a polyoxyethylene alkyl ether sulfuric acid having an alkyl group having 6 to 22 carbon atoms and / or a salt thereof, a salt having 6 to 22 carbon atoms. Polyoxyethylene alkyl ether acetic acid having an alkyl group and / or a salt thereof, alkyl phosphoric acid having an alkyl group having 6 to 22 carbon atoms, an alkali metal salt of alkyl phosphoric acid having an alkyl group having 6 to 22 carbon atoms and / Alternatively, an alkaline earth metal salt, a polyoxyethylene alkyl ether phosphoric acid having an alkyl group having 6 to 22 carbon atoms, an alkali metal salt of a polyoxyethylene alkyl ether phosphoric acid having an alkyl group having 6 to 22 carbon atoms, and / Alternatively, Alari earth metal salt and the like can be mentioned. These anionic surfactants may be used alone or in combination of two or more.

[Treatment agent for elastic fibers]
The viscosity of the treatment agent for elastic fibers of the present invention at 30 ° C. is preferably 5 to 80 mm ² / s, more preferably 5 to 50 mm ² / s, and further preferably 6 to 30 mm ² / s. If the viscosity is too low, the treatment agent may be scattered in the form of mist when the elastic fiber is run in the spinning and post-processing steps, and the surrounding area may be soiled or the operator may inhale. Further, if the viscosity is too high, when the elastic fiber is run in the spinning and post-processing steps, the thread may wind around the running roller due to the adhesiveness, causing thread breakage.

The method for producing the treatment agent for elastic fibers of the present invention is not particularly limited, and a known method can be adopted. For example, a method in which some components are mixed in advance and mixed with other components may be used, or a method in which all the components are mixed at once may be used.

The treatment agent for elastic fibers containing a fatty acid metal salt may be produced by mixing an already pulverized fatty acid metal salt with a base component, or by mixing a fatty acid metal salt with a base component, a vertical bead mill or a horizontal bead mill. , A conventionally known wet pulverizer such as a colloid mill or a sand grinder may be used to pulverize the mixture so as to have a predetermined average particle size. When pulverizing the fatty acid metal salt, the dispersion aids described in JP-A-10-259777 and JP-A-2000-328459, which are conventionally known, may be used.

The weight ratio of the silicone (A) to the treatment agent is preferably 0.01 to 20% by weight, more preferably 0.05 to 15% by weight, further preferably 0.1 to 10% by weight, and 0.2 to 8%. % By weight is particularly preferred. If it is less than 0.01 parts by mass, the anti-scattering property and the antistatic property may be deteriorated. If it exceeds 20 parts by mass, the friction characteristics may be deteriorated and the quality of the cloth may be deteriorated.

The weight ratio of the smoothing agent (B) to the treatment agent is preferably 80 to 99.99% by weight, more preferably 84 to 99.5% by weight, further preferably 88 to 97% by weight, and 90 to 95% by weight. Especially preferable. If the proportion of the smoothing agent (B) is less than 80% by weight, the friction characteristics may be deteriorated and the quality of the cloth may be deteriorated.

When the treatment agent for elastic fibers contains other components, the weight ratio of the other components to the total treatment agent for elastic fibers is preferably 0.01 to, from the viewpoint of maintaining the fluidity when the treatment agent is used. It is preferably 15% by weight, more preferably 0.1 to 13% by weight, still more preferably 0.5 to 10% by weight.

[Elastic fiber]
The elastic fiber of the present invention is obtained by applying the treatment agent for elastic fiber of the present invention to the elastic fiber main body. The adhesion ratio of the elastic fiber treatment agent to the entire elastic fiber is not particularly limited, but is preferably 0.01 to 15% by weight, more preferably 0.1 to 10% by weight, and further preferably 0.5 to 8% by weight. preferable. The method for applying the treatment agent for elastic fibers of the present invention to the elastic fiber main body is not particularly limited, and a known method can be adopted.

The elastic fiber (elastic fiber body) of the present invention is a fiber having elasticity using a polyether polyurethane, a polyester polyurethane, a polyether ester elastomer, a polyester elastomer, a polyethylene elastomer, a polyamide elastomer, etc., and its elongation is usually high. It is 300% or more.

The elastic fiber of the present invention is composed of polyurethane or polyurethane urea, which is obtained by reacting PTMG or polyesterdiol with organic diisocyanate and then extending the chain with 1,4-butanediol, ethylenediamine, propylenediamine, pentandiamine or the like. Can be mentioned. For example, for polyurethane urea elastic fibers, polytetramethylene glycol (PTMG) having a molecular weight of 1000 to 3000 and diphenylmethane diisocyanate (MDI) are prepared, and dimethyl at PTMG / MDI = 1/2 to 1 / 1.5 (molar ratio). A 20-40% solution of a polyurethane urea polymer obtained by reacting in a solvent such as acetoamide or dimethylformamide and extending the chain with a diamine such as ethylenediamine or propanediamine is spun by dry spinning at a spinning speed of 400 to 1200 m / min. Can be manufactured by. The adaptive fineness of the elastic fiber body is not particularly limited.

The elastic fiber body of the present invention may contain an inorganic substance such as titanium oxide, magnesium oxide, hydrotalcite, zinc oxide, and divalent metal soap. Divalent metal soaps include calcium 2-ethylhexylate, calcium stearate, calcium palmitate, magnesium stearate, magnesium palmitate, magnesium laurate, barium stearate, zinc caprate, zinc behenate, zinc stearate, etc. Can be mentioned. As the inorganic substance, one kind or two or more kinds may be used.

As an application of the elastic fiber of the present invention, it can be used as a cloth by processing yarn such as covering yarn such as CSY, single covering, PLY, air covering, circular knitting, tricot and the like. In addition, these processed threads and fabrics are used to impart elasticity to products that require elasticity such as stockings, socks, underwear, and swimwear, and outerwear such as jeans and suits for comfort. Also used for purposes. More recently, it has also been applied to disposable diapers.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to the Examples described here. In addition, "percent (%)" and "part" shown in the following Examples indicate "% by weight" and "part by weight" unless otherwise specified. In Examples and Comparative Examples, the evaluation of each property of the elastic fiber treatment agent was carried out according to the following method.

[Static electricity generation evaluation method]
It was measured as a substitute evaluation method for antistatic properties. In FIG. 1, a Kasuga-type static electricity measuring device is set at the position (5), and elastic fiber cheese (1) to which a treatment agent is applied is set on the unwinding side of the static electricity evaluation measuring machine, and a paper tube on the take-up side (winding side paper tube). 2) is set. After setting the unwinding speed ratio to a constant unwinding speed / winding speed = 1/2, the rollers (3) and (4) are started at the same time. The amount of static electricity generated at 0.5 cm above the thread (6) unraveled from cheese under the conditions of 20 ° C. and 60% RH is measured.
Based on the following evaluation criteria, ○ or higher was regarded as acceptable.
⊚: Less than 0.5 kV (very good)
◯: 0.5 kV or more and less than 1 kV (good)
Δ: 1 kV or more and less than 2 kV (slightly defective)
X: 2 kV or more (defective)

[Measurement of oil scattering amount]
In FIG. 2, the scattering oil collector (9) has a diameter of 15 cm on the spinning side, a diameter of 5 cm on the winding side, and a length in the running thread direction of 20 cm. The distance from the oiling nozzle (8) to the conical spattering oil collector (9) is 15 cm. The spun yarn (7) is passed through the oiling nozzle (8), passed through the scattering oil collector (9), and wound up. In this state, spinning is performed at a speed of 1000 m / min while applying 6% by weight of the oil to the 44 dtex fibers, and the weight of the oil accumulated in the scattered oil collector (9) after 10 minutes is refined. Weigh. The weight at this time is defined as the amount of the oil agent scattered, and the smaller this value is, the less the oil agent is scattered.
⊚: Less than 100 mg (very good)
◯: 100 mg or more and less than 200 mg (good)
X: 200 mg or more (defective)

(Examples 1 to 25, Comparative Examples 1 to 5)
Polytetramethylene ether glycol having an average molecular weight of 1600 is reacted with 4,4-diphenylmethane diisocyanate at a molar ratio of 1: 2, and then chain extension is performed using a dimethylacetamide solution of 1,2-diaminopropane to obtain a polymer concentration as a spinning stock solution. A 33% dimethylacetamide solution was obtained. The concentration of the spinning stock solution was 1900 mPaS (measurement temperature: 30 ° C.).

The obtained spinning dope four ejecting the N ₂ gas stream of 195 ° C. from a spinneret having a pore was dry spinning. Each of the treatment agents for elastic fibers was applied by an oiling roller in an amount of 6% by weight with respect to the running yarn (elastic fiber main body) being spun. Therefore, 5.66% by weight of the treatment agent for elastic fibers was applied to the entire elastic fibers. Then, the elastic fibers treated with the elastic fiber treatment agent were wound around a bobbin at a speed of 500 m / min, respectively, to obtain 44 dtex multifilament cheese (winding amount 450 g). The obtained cheese was used for each evaluation by the above evaluation method.

Table 1 shows the modified silicone (A1) applied to the examples and the modified silicone (a1) applied to the comparative example.
Table 2 shows the aralkyl-modified silicone (A2) applied to the examples.

The smoothing agent (B) and other components (D) applied to the elastic fiber treatment agent are as follows.
B-1: Product name TSF451-5A manufactured by Momentive Performance Materials Co., Ltd.
B-2: Product name TSF451-10 manufactured by Momentive Performance Materials Co., Ltd.
B-3: Product name TSF451-50 manufactured by Momentive Performance Materials Co., Ltd.
B-4: Product name Cosmo Pure Spin E manufactured by Cosmo Oil Lubricants Co., Ltd.
B-5: Product name Ultra-S 2 manufactured by S-OIL
B-6: Product name YUBASE 6 manufactured by SK Lubricants
B-7: Product name PAO601 manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.
D-1: Silicone resin (MQ resin) (500 mm ² / s (25 ° C))
D-2: Isostearyl alcohol: Fineoxocol 180T (manufactured by Nissan Chemical Industries, Ltd.)
D-3: Laurylamine EO3 molar adduct D-4: Magnesium stearate D-5: Isohexadecyl phosphate ester Evaluation results are shown in Tables 3-6.

As can be seen from Tables 3 to 6, the elastic fiber treatment agent according to Examples 1 to 25 is at least one silicone (A) selected from the polyether alkyl co-modified silicone (A1) and the aralkyl-modified silicone (A2). A treatment agent for elastic fibers containing a smoothing agent (B) and a smoothing agent (B).
Since the alkyl group constituting the modified silicone (A1) has 4 to 30 carbon atoms and the modified silicone (A2) has a weight average molecular weight of 1000 to 100,000, it is an object of the present invention to prevent scattering and to prevent scattering. The antistatic property has been solved.
On the other hand, the elastic fiber treatment agents according to Comparative Examples 1 to 5 do not contain modified silicone (Comparative Example 5), or even if they contain modified silicone, the alkyl group constituting the modified silicone (A1) has 4 carbon atoms. Since it is not ~ 30 (Comparative Examples 1 to 4), either the anti-scattering property or the antistatic property, which is the subject of the present invention, cannot be solved.

1 Winding body 2 Winding side paper tube 3 Roller 4 Roller 5 Kasuga type static electricity measuring instrument setting position 6 Thread released from cheese 7 Running thread (spinning tower side)
8 Oiling nozzle 9 Spattering oil collector (conical type)
10 Running thread (winding side)

As a result of diligent studies, the present inventors have found that a treatment agent for elastic fibers containing a specific silicone compound and a smoothing agent can solve the above-mentioned problems.
That is, the treatment agent for elastic fibers of the present invention contains at least one silicone (A) selected from a polyether alkyl co-modified silicone (A1) and an aralkyl-modified silicone (A2), and a smoothing agent (B). an elastic fiber-processing agent containing the a number of carbon atoms in the alkyl group is 4 to 30 constituting the modified silicone (A1), Ri weight average molecular weight from 1,000 to 100,000 der of the modified silicone (A2), wherein The smoothing agent (B) is at least one selected from silicone oil (B1), mineral oil (B2), polyα-olefin (B3), and ester oil (B4), and the smoothing agent (B) in the treatment agent. ) Is 80-99.99% by weight,
The modified silicone (A1) is represented by the following general formula (1) .

The kinematic viscosity of the modified silicone (A1) and / or the modified silicone (A2) at 25 ° C. is preferably 5 ^{to 10000 mm 2 / s.}
The weight average molecular weight of the modified silicone (A1) is preferably 1000 to 100,000.
The modified silicone (A1) is Ru represented by the following general formula (1).

It is preferable that at least one selected from the a, d and e is an integer of 1 to 1000.
It is preferable that at least two selected from the a, d and e are integers of 1 to 1000.
It is preferable that the a, d and e are integers of 1 to 1000.
The weight ratio of the modified silicone (A1) to the treatment agent is preferably 0.01 to 20% by weight.

Claims (9)

A treatment agent for elastic fibers containing at least one silicone (A) selected from a polyether alkyl co-modified silicone (A1) and an aralkyl-modified silicone (A2) and a smoothing agent (B).
A treatment agent for elastic fibers, wherein the alkyl group constituting the modified silicone (A1) has 4 to 30 carbon atoms, and the modified silicone (A2) has a weight average molecular weight of 1000 to 100,000. The treatment agent for elastic fibers according to claim 1, wherein the modified silicone (A1) and / or the modified silicone (A2) has a kinematic viscosity of 5 to 10000 mm ^{2 / s at 25 ° C.} The treatment agent for elastic fibers according to claim 1 or 2, wherein the modified silicone (A1) has a weight average molecular weight of 1000 to 100,000. The treatment agent for elastic fibers according to any one of claims 1 to 3, wherein the modified silicone (A1) is represented by the following general formula (1).

(In the general formula (1)
X ¹ : An organic group represented by the general formula (2).
X ² : Alkyl group having 4 to 30 carbon atoms X ³ : Organic group represented by the general formula (3) X ⁴ : Organic group represented by the general formula (4) a: An integer of 0 to 1000
b: Integer from 1 to 1000
c: Integer from 1 to 1000
d: An integer from 0 to 1000
e: Integer from 0 to 1000
However, the binding unit of a, b, c, d, and e may be random or block, and the binding order does not matter. )

(However, in the general formula (2),
R ^1: a hydrogen atom, a hydrocarbon group having 1 to 30 carbon atoms, or ^R 2 - (CO) - organic group represented by ^{R 2:} hydrocarbon group having 1 to 30 carbon atoms f: 0 to 20 integer g: Integer from 2 to 200 h: Integer from 0 to 200 However, the combination unit of g and h may be random or block)

(In the general formula (3), R ³ is an unsubstituted or substituted monovalent hydrocarbon such as an alkyl group having 1 to 30 carbon atoms, an aryl group, an aralkyl group, a fluorine-substituted alkyl group, an amino-substituted alkyl group, and a carboxyl-substituted alkyl group. group, or .R ³ is an organic group of the general formula (2) may each be the same or different.)
i: Integer from 1 to 5 j: Integer from 0 to 500)

R ⁴ : An aliphatic hydrocarbon group having 1 to 10 carbon ^{atoms R 5} : A hydrogen atom or an aliphatic hydrocarbon group having 1 to 5 carbon atoms The treatment agent for elastic fibers according to claim 4, wherein at least one selected from the a, d and e is an integer of 1 to 1000. The treatment agent for elastic fibers according to claim 4 or 5, wherein at least two selected from the a, d and e are integers of 1 to 1000. The treatment agent for elastic fibers according to any one of claims 4 to 6, wherein the a, d and e are integers of 1 to 1000. One of claims 1 to 7, wherein the weight ratio of the silicone (A) to the treatment agent is 0.01 to 20% by weight, and the weight ratio of the smoothing agent (B) is 80 to 99.99% by weight. The above-mentioned treatment agent for elastic fibers. An elastic fiber obtained by applying the treatment agent for elastic fiber according to any one of claims 1 to 8 to the elastic fiber main body.

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