JP2003201678A - Finishing oil for elastic fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a finishing oil for elastic fiber that has excellent scumming prevention and improves adhesion prevention performance between fibers in the production of elastic fiber. <P>SOLUTION: The finishing oil for elastic fiber comprises (A) a high-polymer organopolysiloxane having viscosity of ≥2,000 mm<SP>2</SP>/s as a 30 mass % solution in a xylene solvent, measured with an Ubbellohde viscometer at 25°C and (B) a base oil. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oil agent for elastic fibers. More specifically, the present invention relates to an oil agent that can be suitably used for preventing sticking in the spinning process of elastic fibers such as polyurethane fibers.

[0002]

2. Description of the Related Art Conventionally, in a process of spinning an elastic fiber such as polyurethane fiber, a method of attaching an oil agent to the fiber to prevent the fibers from sticking to each other is to suspend solid metal soap in a base oil. Known methods include a method of producing a mold effect (see, for example, Patent Documents 1 and 2); a method of using a polyether-modified silicone that is liquid at room temperature (see, for example, Patent Documents 3 and 4).

[0003]

[Patent Document 1] Japanese Patent Publication No. 41-286 (1st to 2nd)
page)

[Patent Document 2] Japanese Patent Publication No. 40-5557 (Nos. 1-5)
page)

[Patent Literature 3] Japanese Patent Publication No. 45-40719 (first to first)
(Page 5)

[Patent Document 4] Japanese Patent Application Laid-Open No. 48-19893 (first to first)
(Page 5)

[0004]

However, the method of suspending a solid metal soap has a problem in that the workability is poor because a large amount of scum is obtained although the effect of preventing sticking is obtained. Also, in the method of using a polyether-modified silicone that is liquid at room temperature, scum is small,
There has been a demand for an oil agent that cannot achieve a satisfactory effect on the anti-sticking property and can achieve both the anti-sticking property and the scum preventing property.

An object of the present invention is to provide an oil agent for elastic fibers, which has excellent scum preventing properties and good anti-sticking properties between fibers when producing elastic fibers.

[0006]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors in order to achieve the above object, it was found that the above problems can be solved by using an oil agent containing a highly polymerized polyorganosiloxane having a specific viscosity range. Found and arrived at the present invention.

That is, the present invention comprises a highly polymerized polyorganosiloxane (A) and a base oil (B) whose viscosity of a 30 mass% xylene solution at 25 ° C. measured by an Ubbelohde viscometer is 2,000 mm ² / s or more. An elastic fiber oil agent; a method for treating an elastic fiber, wherein 0.1 to 12% by mass of the elastic fiber oil agent is applied to the elastic fiber; and an elastic fiber treated by the treatment method.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the highly polymerized polyorganosiloxane (A) is a viscous liquid or paste at 25 ° C., and is a 30 mass% xylene solution at 25 ° C. measured by an Ubbelohde viscometer. Viscosity (hereinafter abbreviated as K viscosity) is usually 2,000 mm ² / s or more, preferably 4,000 to 30,000 mm ² / s,
More preferably 7,000 to 25,000 mm ² / s
Is. If it is less than 2,000 mm ² / s, the effect of preventing sticking cannot be obtained.

Examples of (A) include (A1) highly polymerized polydimethylsiloxane, highly polymerized polymethylphenylsiloxane, (A2) highly polymerized alkyl-modified silicone, and (A)
3) Highly polymerized amino-modified silicone can be mentioned.

(A1) Highly polymerized polydimethylsiloxane,
Highly polymerized polymethylphenyl siloxane A compound in which R ¹ , R ² , R ³ , and R ⁴ are methyl groups or phenyl groups in the following general formula (1). a and b are 0 or an integer greater than or equal to 1 which makes K viscosity in the said range. a + b is
It is preferably 2,500 to 7,000, more preferably 4,000 to 6,500. (When all of R ¹ , R ² , R ³ and R ⁴ are methyl groups, it is a highly polymerized polydimethylsiloxane. When b = 0, R ¹ and R ^{4 are}
Of at least one of R ¹ , R ² and R ³ when b ≠ 0
When at least one of R ⁴ and R ⁴ is a phenyl group, it is a highly polymerized polymethylphenylsiloxane. )

[0011]

[Chemical 1]

The following a + b is the weight average molecular weight (hereinafter Mw
Is abbreviated. ) Is the value obtained from. Mw is measured by gel permeation chromatography (hereinafter abbreviated as GPC method. Measurement conditions Solvent: Tetrahydrofuran Column: TSKgel Super H4000, TSKge
l Super H3000, TSKgel Supe
r H2000 molecular weight calibration: polystyrene).

(A2) Highly polymerized alkyl-modified silicone In the general formula (1), at least one of R ¹ , R ² , R ³ and R ⁴ (at least 1 of R ¹ and R ⁴ when b = 0).
One) is an alkyl group having 2 to 20 carbon atoms - (CH ₂₎ p-
Ph (Ph is a phenyl group, p is an integer of 1 to 4) group. The rest may be methyl groups. a and b are 0 or an integer greater than or equal to 1 which makes K viscosity in the said range. a +
b is preferably 2,500 to 7,000, more preferably 4,000 to 6,500.

(A3) Highly polymerized amino-modified silicone In the above general formula (1), R¹, R², R³, R^FourLess
Both are 1 (when b = 0, R¹And R^FourAt least one of
) Is -R^{twenty three}-NH (R^{twenty four}NH) tH group-containing group (R ^{twenty three}Is charcoal
An alkylene group having a prime number of 1 to 5, R^{twenty four}Is an al having 1 to 4 carbon atoms
A xylene group, and t is an integer of 0 to 3). remaining
May be a methyl group. The K viscosity of a and b is within the above range.
0 or an integer of 1 or more. a + b is preferably
2,500 to 7,000, more preferably 4,000
~ 6,500. Of these (A), preferred
Is a highly polymerized polydimethylsiloxane.

A base oil (B) is used in the oil agent of the present invention for the purpose of imparting smoothness. (B) is not particularly limited as long as it is usually used as a base oil of an oil agent for elastic fibers, but has a K viscosity of 1,500 m.
m ² / s or less polyorganosiloxane (B1) [however, organic acid-modified silicone, epoxy-modified silicone,
Amino-modified silicone, silicone resin (a solid polymer having a three-dimensional structure having a high degree of branching) and polyether-modified silicone are excluded], hydrocarbon-based lubricating oil (B2) and combinations thereof are preferable. Other than these (B3), fluorine-based lubricating oil, alcohol-based lubricating oil, carboxylic acid-based lubricating oil, carboxylic ester-based lubricating oil, polyether-based lubricating oil, and the like may be used.

Polyorganosiloxane (B1) is a
The viscosity at 25 ° C measured by a Rohde viscometer is usually
50,000 mm²/ S or less, preferably 10,000
mm ²/ S or less, more preferably 1 to 1,000 mm
²/ S. K viscosity is usually 1,500 mm
²/ S or less, preferably 1,000 mm²/ S or less
And preferably 1 to 500 mm²/ S.
Examples of (B1) include the following (B1-1) and (B
1-2) can be mentioned. (B1-1) Polydimethylsiloxane, polymethylphene
Nyl siloxane In the general formula (1), R¹, R², R³, R^FourIs methyl
A group or a phenyl group. a and b are 0 or 1 or more
It is the above integer, and a + b is 1 to 1,000. (You
If all are methyl groups, it is polydimethylsiloxane.
It Also, when b = 0, R¹And R^FourAt least one of
, But when b ≠ 0, R¹, R², R³And R^FourLittle
If at least one is a phenyl group, polymethylphenyl
It is a siloxane. )

(B1-2) Alkyl-modified silicone At least one of R ¹ , R ² , R ³ and R ⁴ (at least one of R ¹ and R ⁴ when b = 0) has 2 to 20 carbon atoms. alkyl or _{- (CH 2) p-Ph} (Ph is a phenyl group, p is an integer of 1 to 4) as a group. The rest may be methyl groups. a and b are 0 or an integer greater than or equal to 1, and a + b is 1 to 1,000. These (B1)
Among them, preferred is polydimethylsiloxane, particularly polydimethylsiloxane having a viscosity at 25 ° C. of 3 to 100 mm ² / s and a K viscosity of 1 to 50 mm ² / s.

The hydrocarbon lubricating oil (B2) has a viscosity of 1 to 1,000 mm ² / s at 25 ° C. measured by an Ubbelohde viscometer and a K viscosity of 1 to 500 mm.
² / s mineral oil and its refined oil, hydrogenated and / or cracked oil, etc. are mentioned. Of these, the preferred one is
K viscosity is 1 to 50 (more preferably 1 to 30) mm ²
/ S mineral oil and especially its refined oils. As (B), (B1), (B2) and (B3) can be used alone or in combination. The mass ratio of (B1) / (B2) / (B3) when used in combination is not particularly limited, but is 100/0/0 to 15/75/10.
Is preferred, and 99/1/0 to 30/65/5 is more preferred.

The content of the base oil (B) in the oil agent for elastic fiber of the present invention is preferably 70% by mass relative to the total oil agent (nonvolatile content) from the viewpoint of obtaining good smoothness and anti-sticking property. As described above, the amount is more preferably 75 to 99.8% by mass, and particularly preferably 80 to 99% by mass. The content of the highly polymerized polyorganosiloxane (A) is preferably 0.01 to 5% by mass, more preferably 0.02 to 3% by mass, and particularly preferably 0.05 to 2% by mass.
If it is 0.01% by mass or more, the effect of preventing sticking is large, and 5
When it is at most% by mass, the viscosity will be low and handling will be easy.

The oil agent of the present invention may optionally contain one or more additives selected from the antistatic agent (C), the softening agent (D) and the anti-sticking agent (E) other than (A). Good.

Examples of the antistatic agent (C) include anionic surfactants (C) such as those described in US Pat. Nos. 4,331,447 and 3,929,678.
1), an amphoteric surfactant (C2) and a cationic surfactant (C3). As the anionic surfactant (C1), a carboxylate (C1-1), a sulfate ester salt (C1-2), a salt of a carboxymethylated product (C1-).
3), sulfonate (C1-4), phosphate ester salt (C1-5) and the like.

Examples of the carboxylic acid salt (C1-1) include salts of saturated or unsaturated aliphatic carboxylic acids (including oxycarboxylic acid) having 8 to 22 carbon atoms, specifically,
Saturated aliphatic carboxylic acids such as caprylic acid, berargonic acid, lauric acid, myristic acid, stearic acid, isostearic acid, behenic acid, 2-ethylhexanoic acid; unsaturated aliphatic carboxylic acids such as oleic acid; aliphatic oxycarboxylic acids , Eg ricinoleic acid, oxystearic acid;
And a mixture of higher fatty acids obtained by saponifying palm oil, palm kernel oil, rice bran oil, beef tallow, etc .; and the like. Examples of the salt include alkali metals (sodium, potassium, etc.), ammonium, amines such as mono- and di-.
And tri-alkanolamines (C2-8; triethanolamine etc.), mono-, di- and tri-alkylamines (C1-6 of the alkyl group; triethylamine etc.), heterocyclic amines (morpholine etc.), etc. Of salt. The same is used for the following salt (C1).

As the sulfate ester salt (C1-2),
(C1-21) higher alcohol sulfate ester salt (sulfate ester salt of aliphatic alcohol having 8 to 18 carbon atoms), (C
1-22) Higher alkyl ether sulfate ester salt [Sulfate ester salt of 1 to 10 mol adduct of ethylene oxide (hereinafter abbreviated as EO) and / or propylene oxide (hereinafter abbreviated as PO) of an aliphatic alcohol having 8 to 18 carbon atoms] ], (C1-23) sulfated oil (natural unsaturated fats and oils or unsaturated wax obtained by directly sulfating and neutralizing), (C1-24) sulfated fatty acid ester [unsaturated fatty acid (having 3 to 10 carbon atoms) 18) lower alcohols (C1-C1)
7) Sulfate-neutralized ester], and (C
1-25) Sulfated olefins (olefins having 12 to 18 carbon atoms that have been sulfated and neutralized) and the like.

Specific examples of (C1-21) include octyl alcohol sulfate ester salt, decyl alcohol sulfate ester salt, lauryl alcohol sulfate ester salt, stearyl alcohol sulfate ester salt, and alcohols synthesized using a Ziegler catalyst (for example, ALFOL 121
4: Sulfate ester salt of CONDEA) and an alcohol synthesized by the oxo method (for example, dobanol 23,2)
5,45: Mitsubishi Chemical, Tridecanol: Kyowa Hakko,
Oxochol 1213, 1215, 1415: manufactured by Nissan Chemical Co., Ltd., and sulphate salt of Diadol 115-L, 115H, 135: manufactured by Mitsubishi Chemical Co., Ltd., etc. (C1-2
Specific examples of 2) include a sulfate ester salt of lauryl alcohol EO2 mol adduct, and octyl alcohol E.
Examples thereof include sulfuric acid ester salts of O3 mole adducts. (C
Specific examples of 1-23) include castor oil, peanut oil, olive oil, rapeseed oil, and salts of sulfates such as beef tallow and sheep fat. As a specific example of (C1-24),
Examples thereof include salts of sulfates such as butyl oleate and butyl ricinoleate. Specific examples of (C1-25) include, for example, Tepall (manufactured by Shell Co.).

The carboxymethylated salt (C1-3) includes (C1-31) aliphatic alcohols (having 8 to 12 carbon atoms).
24) carboxymethylated salt, and (C1-3
2) Salts of carboxymethylated products of EO and / or 1 to 20 mol of PO of aliphatic alcohol (having 8 to 24 carbon atoms) and the like.

Specific examples of (C1-31) include octyl alcohol carboxymethylated sodium salt, decyl alcohol carboxymethylated sodium salt, lauryl alcohol carboxymethylated sodium salt, dovanol 23 carboxymethylated sodium salt, and tridecanol. Carboxymethylated sodium salt and the like can be mentioned. Specific examples of (C1-32) include octyl alcohol EO3 mol adduct carboxymethylated sodium salt, lauryl alcohol EO4 mol adduct carboxymethylated sodium salt, isostearyl alcohol EO3.
Examples thereof include a carboxymethylated sodium salt of a molar adduct, a EO3 molar carboxymethylated sodium salt of dobanol 23EO, and a tridecanol EO5 molar carboxymethylated sodium salt of an adduct.

The sulfonate (C1-4) includes (C
1-41) Alkyl (C8-24) benzene sulfonate, (C1-42) Alkyl (C8-24) naphthalene sulfonate, (C1-43) sulfosuccinic acid diester [e.g. An ester of an alcohol selected from 20 or more saturated or unsaturated alcohols and 1 to 10 mol adducts of these alkylene oxides, a (C1-44) α-olefin (having 3 to 30 carbon atoms) sulfonate, And (C1-45) igepon T type and the like.

Specific examples of (C1-41) include sodium dodecylbenzene sulfonate and the like; (C1-42)
Examples of dodecylnaphthalene sulfonic acid sodium salt and the like; specific examples of (C1-43) include sulfosuccinic acid di-2-ethylhexyl ester sodium salt and the like.

As the phosphoric acid ester salt (C1-5),
(C1-51) higher alcohol (C8-24) phosphate ester salt, (C1-52) higher alcohol (C8-24) EO adduct phosphate ester salt, etc. are mentioned.

Specific examples of (C1-51) include lauryl alcohol phosphoric acid monoester disodium salt, lauryl alcohol phosphoric acid diester sodium salt, and the like; specific examples of (C1-52) include oleyl alcohol EO (5 mol) addition. Examples include phosphoric acid monoester disodium salt and the like.

As the amphoteric surfactant (C2), betaine-type amphoteric surfactant, amino acid-type amphoteric surfactant, sulfonate-type amphoteric surfactant and the like can be used. (C
Preferred among 2) are, for example, those represented by the following general formula (2), (3) or (4), and mixtures of two or more thereof.

[0032]

[In the formula, R^Five, R⁶, R⁷Are independent
Include an alkyl group having 1 to 30 carbon atoms, an alkenyl group, and a hydro
Xyalkyl group, polyoxyalkylene group (alkylene
Carbon number of the group: 2-4), and formula R⁹-T-R^TenIndicated by-
Group (R⁹Is COOH from fatty acids having 1 to 30 carbon atoms
Residue excluding groups, R^TenIs an alkylene group having 1 to 4 carbon atoms
Or a hydroxyalkylene group, T is -COO- or-
Represents CONH-. A group selected from R);^FiveAnd R⁶And R⁷
And any two of them combine with N to form a heterocycle.
May be present; R⁸Is an alkylene group having 1 to 4 carbon atoms or
Is a hydroxyalkylene group; X^-Is COO^-Or S
O₃ ^-; R¹¹Is an alkyl group having 1 to 30 carbon atoms, alkenyl
Group or hydroxyalkyl group; R¹²Has 1 to 4 carbon atoms
An alkylene group or a hydroxyalkylene group; R¹³Is water
Elementary atom or formula-R¹²COOM_{1 / m}A group represented by R¹⁴
Is a hydrogen atom, an alkyl group having 1 to 30 carbon atoms or an alkene
Nyl group; R ¹¹And R¹⁴And any two of them combine with N
May form a heterocycle; M is a hydrogen atom,
Li metal, alkaline earth metal or amine cation
And when M is plural, they may be the same or different; m is
It represents the valence of M and is 1 or 2. ]

The alkyl group having 1 to 30 carbon atoms of R ⁵ , R ⁶ , R ⁷ , R ¹¹ and R ¹⁴ may be linear or branched and may be a methyl group, an ethyl group, n- and i. -Propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, Nonadecyl group, eicosyl group, hexosyl group, docosyl group, 2-ethyldecyl group, etc .; The alkenyl group having 2 to 30 carbon atoms may be linear or branched, and n- and i-propenyl groups, hexenyl Group, heptenyl group, octenyl group, decenyl group,
Undecenyl group, dodecenyl group, tetradecenyl group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group and nonadecenyl group and 2
-Ethyldecenyl group and the like.

The carbon number of R ⁵ , R ⁶ , R ⁷ and R ¹¹ is 1 to
The 30 hydroxyalkyl group may be linear or branched, and may be hydroxymethyl group, hydroxyethyl group, n- and i-hydroxypropyl group, hydroxybutyl group, hydroxyhexyl group, hydroxyoctyl group, hydroxy group. Examples thereof include a decyl group, a hydroxydodecyl group, a hydroxytetradecyl group, a hydroxyhexadecyl group and a hydroxyoctadecyl group.
The polyoxyalkylene group represented by R ⁵ , R ⁶ and R ⁷ is a group represented by the formula R ¹⁵ — (OA) n — (R ¹⁵ is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and A is 2 carbon atoms). To 4 alkylene groups, and n is an integer of 2 to 15). Examples of the alkylene group A having 2 to 4 carbon atoms include 1,2-ethylene group, 1,2- and 1,3-propylene group, and 1,2-, 2,3-, 1,3- and 1,4 A butylene group and the like. The alkyl group R ¹⁵ having 1 to 4 carbon atoms is
It may be linear or branched, and examples thereof include a methyl group, an ethyl group, n- and i-propyl groups, and a butyl group.

Residue R of the group represented by R ⁹ -T-R ^10-
The fatty acid having 1 to 30 carbon atoms constituting ⁹ may be linear or branched, formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, belargon. Acid, lauric acid, myristic acid, stearic acid, isostearic acid, behenic acid, 2
-Ethylhexanoic acid etc. are mentioned. Of these, preferred are fatty acids having 6 to 24 carbon atoms. The alkylene group having 1 to 4 carbon atoms of R ¹⁰ may be linear or branched, and may be a methylene group, an ethylene group, a propylene group of n- and i-, a butylene group, or the like; The hydroxyalkylene group may be linear or branched, and examples thereof include a hydroxymethylene group, a hydroxyethylene group, n- and i-hydroxypropylene groups, and a hydroxybutylene group. Of these, preferred is an alkylene group having 1 to 4 carbon atoms.

Of these, preferred are R ⁵ and R ¹¹ are alkyl groups having 6 to 24 carbon atoms, alkenyl groups, hydroxyalkyl groups, and R ⁹ CONHR ¹⁰ − groups, and R ⁶ and R ⁷ are those having carbon atoms. It is an alkyl group having 1 to 24, an alkenyl group and a hydroxyalkyl group, and R ¹⁴ is a hydrogen atom and an alkyl group having 6 to 24 carbon atoms and an alkenyl group.

Any of R ⁵ , R ⁶ and R ⁷ which are bonded to each other to form a heterocyclic ring with N, one of which forms an alicyclic compound, or R ¹¹ and R ¹⁴ . Examples of two or more of them forming a heterocycle with N and an alicyclic compound include, for example, imidazoline ring, imidazole ring, pyridine ring, pyrimidine ring,
Examples include a piperidine ring and a morpholine ring.

Examples of the alkylene group having 1 to 4 carbon atoms for R ⁸ and R ¹² include those similar to R ^10, and the preferred ones are also the same. X ^- preferred are COO of ^-
Is.

R ¹³ is a hydrogen atom or R ¹² COOM _{1 / m}
It is a base. Among these, preferred is a mixture in which R ¹³ is hydrogen atom and R ¹³ is R ¹² COOM _{1 / m} group. Examples of the alkali metal of M include lithium, potassium and sodium; examples of the alkaline earth metal include calcium and magnesium; examples of the amine cation include mono-, di- and tri-ethanolamine cations and 2-ethylhexylamine cation. . Among these, preferred are a hydrogen atom and an alkali metal.

The betaine-type amphoteric surfactant represented by the general formula (2) is, for example, alkyl (having 1 to 3 carbon atoms).
0) dimethyl betaine (stearyl dimethyl betaine,
Lauryl dimethyl betaine etc.), alkyl (C1-C1)
30) Amidoalkyl (having 1 to 4 carbon atoms) dimethyl betaine (coconut oil fatty acid amide propyl dimethyl betaine, lauramido propyl dimethyl betaine, stearamido propyl dimethyl betaine, etc.), alkyl (having 1 to 3 carbon atoms)
0) Dihydroxyalkyl (having 1 to 30 carbon atoms) betaine (lauryl dihydroxyethyl betaine etc.), sulfobetaine type amphoteric surfactant (pentadecyl dimethyl taurine etc.) and the like can be mentioned. Of these, preferred are alkyl dimethyl betaine and alkylamidoalkyl dimethyl betaine.

Examples of the amino acid-type amphoteric surfactant represented by the general formula (3) include alanine-type [alkyl (C 1-30) aminopropionic acid-type, alkyl (C 1-30) iminodipropionic-acid. Type, etc.] Amphoteric surfactant (sodium stearylaminopropionate, sodium β-laurylaminopropionate, N-lauryl-
[beta] -iminodipropionate and the like) and glycine type [alkyl (C1 to C30) aminoacetic acid type and the like] amphoteric surfactants (sodium laurylaminoacetate and the like). Of these, alkylaminopropionic acid-type amphoteric surfactants and alkyliminodipropionic acid-type amphoteric surfactants are preferable.

Examples of the sulfonate type amphoteric surfactant represented by the general formula (4) (aminosulfonic acid type amphoteric surfactant) include, for example, alkyl (C 1 to C 30) taurine type (C ₁₅ H ₃₁ NHCH). ₂ CH ₂ SO ₃ Na, C ₁₇ H ₃₅ NH
CH ₂ CH ₂ CH ₂ SO ₃ Na, etc.) amphoteric surfactants and the like.

Examples of the cationic surfactant (C3) include quaternary ammonium salt type cationic surfactants and amine salt type cationic surfactants. Examples of (C3) include those represented by the following general formula (5) or (6), and mixtures of two or more thereof.

[0045]

[Wherein R ¹⁶ , R ¹⁷ , and R ¹⁸ are each independently an alkyl group having 1 to 30 carbon atoms, an alkenyl group, a hydroxyalkyl group, a polyoxyalkylene group (the carbon number of the alkylene group is 2 to 4). , And a group represented by the formula R ⁹ —T—R ¹⁰ — (R ⁹ is a C 1-30 fatty acid to COOH
A residue excluding a group, R ¹⁰ is an alkylene group or a hydroxyalkylene group having 1 to 4 carbon atoms, and T is —COO— or —
Represents CONH-. A group selected from); R ¹⁹ has 1 carbon atom
30 alkyl group, alkenyl group, hydroxyalkyl group or a polyoxyalkylene group; R ¹⁶ and R ¹⁷ and R ¹⁸
And any two of them may form a heterocycle together with N; Q ⁻ represents an inorganic acid anion or an organic acid anion, and QH represents an inorganic acid or an organic acid. ]

Examples of R ¹⁶ , R ¹⁷ , and R ¹⁸ alkyl groups having 1 to 30 carbon atoms, alkenyl groups, hydroxyalkyl groups, polyoxyalkylene groups, and groups represented by the formula R ⁹ —T—R ¹⁰ — The same as R ⁵ , R ⁶ and R ⁷ can be mentioned. Of these, R ¹⁶ , R ¹⁷ and R ¹⁸ are preferably an alkyl group having 1 to 24 carbon atoms, an alkenyl group and a hydroxyalkyl group. The alkyl group having 1 to 30 carbon atoms, the alkenyl group, the hydroxyalkyl group or the polyoxyalkylene group of R ¹⁹ is the same as those described for R ¹⁶ , R ¹⁷ and R ¹⁸ . Of these, the preferred one is
An alkyl group having 1 to 4 carbon atoms and a hydroxyalkyl group. Examples of those in which any two of R ¹⁶ , R ¹⁷ and R ¹⁸ are bonded to form a heterocyclic ring or an alicyclic compound with N include, for example, imidazoline ring, imidazole ring, pyridine ring, pyrimidine ring, piperidine ring. And a morpholine ring.

The anion Q ^- forming acids include the following as a QH. (1) Inorganic acid hydrohalic acid (hydrochloric acid, bromic acid, iodic acid, etc.), nitric acid,
Carbonic acid, phosphoric acid, etc .; (2) Organic acid (a) Alkyl sulfuric acid ester, such as methyl sulfuric acid and ethyl sulfuric acid, having 1 to 4 carbon atoms; (b) Alkyl phosphoric acid ester, such as dimethyl phosphoric acid, diethyl phosphoric acid, etc. 8 mono- and / or dialkyl phosphate esters;

(C) Aliphatic monocarboxylic acid having 1 to 30 carbon atoms Saturated monocarboxylic acid (such as those listed as a fatty acid whose residue constitutes R ⁹ ) and unsaturated monocarboxylic acid (acrylic acid, methacrylic acid, Oleic acid) and aliphatic oxycarboxylic acids (glycolic acid, lactic acid, oxybutyric acid, oxycaproic acid, ricinoleic acid, oxystearic acid, gluconic acid, etc.); (d) aromatic or heterocyclic ring having 7 to 30 carbon atoms. Monocarboxylic acid Aromatic monocarboxylic acid (benzoic acid, naphthoic acid, cinnamic acid, etc.), aromatic oxycarboxylic acid (salicylic acid, p-oxybenzoic acid, mandelic acid, etc.), and heterocyclic monocarboxylic acid (pyrrolidone carboxylic acid) etc);

(E) Polycarboxylic acid having 2 to 4 valences Linear or branched aliphatic polycarboxylic acid having 2 to 30 carbon atoms [saturated polycarboxylic acid (oxalic acid, malonic acid, succinic acid, glutaric acid, Adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, etc.), carbon number 4-30
Unsaturated polycarboxylic acids (maleic acid, fumaric acid, itaconic acid, etc.)]; Aliphatic oxypolycarboxylic acids having 4 to 20 carbon atoms (malic acid, tartaric acid, citric acid, etc.);
To 30 aromatic polycarboxylic acids [dicarboxylic acids [phthalic acid, isophthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid and biphenyldicarboxylic acid (2,2 ′
-, 3,3'- and / or 2,7-form), etc.], tri- or tetracarboxylic acid (trimellitic acid, pyromellitic acid, etc.)]; and polycarboxylic acid containing sulfur and having 4 to 30 carbon atoms ( Thiodipropionic acid, etc.); (f) Amino acid having 2 to 30 carbon atoms, such as aspartic acid, glutamic acid, cysteic acid; (g) Some of the methyl groups of the organic acid-modified silicone diorganopolysiloxane are -R ^20.
An organic acid substituted with a COOH group and / or a —R ²⁰ SO ₃ H group, for example, one represented by the above general formula (1) and having the following composition.

As (g), in the general formula (1),
Me is a methyl group, and at least one of R ¹ , R ² , R ³ and R ⁴ is —R ²⁰ COOH group and / or —R ²⁰ S.
O ₃ H group (R ²⁰ represents an alkylene group having 2 to 5 carbon atoms), the rest being a methyl group, a phenyl group, and 2 carbon atoms.
20 alkyl group or a _{- (CH 2) p-Ph} (Ph is a phenyl group, p is an integer of 1 to 4) may be a group. a,
b is an integer of 1 to 2,000. The alkylene group having 2 to 5 carbon atoms may be linear or branched,
Examples thereof include ethylene groups, n- and i-propylene groups, butylene groups, and hexylene. For example, the viscosity at 25 ° C. is 5 to 20,000 mm ² / s, and the K viscosity is 1
Carboxy equivalent of 200 to ^{2 at} 1,500 mm ² / s
10,000 carboxy-modified silicones, etc.

(H) Aliphatic alcohol (having 8 to 2 carbon atoms)
4) Carboxymethylation product Octyl alcohol carboxymethylation product, decyl alcohol carboxymethylation product, lauryl alcohol carboxymethylation product, Dovanol 23 (Mitsubishi Yuka) carboxymethylation product and tridecanol (Kyowa Hakko) carboxymethylation product etc. (I) Carboxymethylation product of EO and / or PO1 to 20 mol adduct of aliphatic alcohol (C8 to C24) Carboxymethylation product of octyl alcohol EO3 mol adduct, Carboxymethyl product of lauryl alcohol EO2.5 mol adduct Compound, isostearyl alcohol EO3
Carboxymethylation product of molar adduct, Dobanol 23E
Carboxymethylated product of O3 mol adduct and carboxymethylated product of tridecanol EO2 mol adduct and the like.

Preferred among these are methylsulfuric acid, ethylsulfuric acid, adipic acid, gluconic acid, especially isostearic acid, and a viscosity at 25 ° C. of 10 to 8,000.
(Further 20-5,000, especially 30-1000) m
m ² / s, K viscosity is ² to 600 mm ² / s, carboxyl equivalent is 300 to 8,000 (further 400 to
4,000, especially 500-1,500) carboxy-modified silicone, and lauryl alcohol EO1-5
It is a carboxymethylated product of a molar adduct.

Examples of the quaternary ammonium salt type cationic surfactant represented by the general formula (5) include alkyl (C 1-30) trimethyl ammonium salts (lauryl trimethyl ammonium chloride, lauryl trimethyl ammonium isostearate, Lauryl trimethyl ammonium carboxy modified silicone salt etc.), dialkyl (C 1-30) dimethyl ammonium salt [didecyl dimethyl ammonium chloride, dioctyl dimethyl ammonium bromide, didecyl dimethyl ammonium isostearate, di (didecyl dimethyl ammonium) adipate, Carboxymethylation of didecyldimethylammonium carboxy-modified silicone salt, didecyldimethylammonium lauryl alcohol EO 1-5 mol adduct Such salts], nitrogen ring-containing quaternary ammonium salt (cetyl pyridinium chloride, etc.), poly (addition molar number 2 to 15) oxyalkylene (2 carbon atoms
4) Chain-containing quaternary ammonium salt [poly (additional mol number 3) oxyethylene trimethyl ammonium chloride, etc.], alkyl (C 1-30) amidoalkyl (C 1-10) dialkyl (C 1-4) Methylammonium salt (stearamidoethyldiethylmethylammonium methosulfate etc.) etc. are mentioned. Of these, preferred are the organic acid salts of alkyltrimethylammonium and especially the organic acid salts of dialkyldimethylammonium.

As the amine salt type cationic surfactant represented by the general formula (6), tertiary amines are used as inorganic acids (hydrochloric acid, nitric acid, sulfuric acid, hydroiodic acid, etc.) or organic acids (acetic acid, formic acid, oxalic acid, Those obtained by neutralization with lactic acid, gluconic acid, adipic acid, alkyl sulfuric acid, etc. can be used. For example,
Aliphatic tertiary amines having 3 to 90 carbon atoms (triethylamine, ethyldimethylamine, didecylmethylamine,
N, N, N ', N'-tetramethylethylenediamine,
Lauramidopropyldimethylamine, etc.), carbon number 3-9
0 alicyclic (including nitrogen-containing heterocycle) tertiary amine (N-
Methylpyrrolidine, N-methylpiperidine, N-methylmorpholine, 4-dimethylaminopyridine, N-methylimidazole, 4,4′-dipyridyl, etc.), a carbon number of 3 to
Examples thereof include inorganic acid salts or organic acid salts such as 90 hydroxyalkyl group-containing tertiary amines (triethanolamine monostearate, N-stearamide ethyldiethanolamine, etc.). Of these, the preferred one is
Inorganic and organic acid salts of aliphatic amines.

Preferred as (C) are amphoteric surfactants (C2), and especially a combination of (C2) with a cationic surfactant (C3) (for example, 9: 1 to 1: 1 by mass ratio).
9).

The content of (C) in the elastic agent (nonvolatile content) for elastic fiber of the present invention is such that the total amount of the oil agent (from the viewpoint of giving the oil agent a sufficient antistatic property and an appropriate viscosity without causing thread breakage, etc.). It is preferably 20% by mass or less, and more preferably 0.01 to 10% by mass, based on (nonvolatile content).

Examples of the softening agent (D) include the epoxy-modified silicone (D1) and amino-modified silicone (D2) represented by the general formula (1) and having the following compositions. The Mw of (D) is preferably 500 to 100,0.
00, and more preferably 1,000 to 20,000. The K viscosity is 1,500 mm ² / s or less.

Examples of the epoxy-modified silicone (D1) include those in which at least one of R ¹ , R ² , R ³ and R ^{4 in} the general formula (1) is an epoxy group-containing group. The rest may be a methyl group, an alkyl group having 2 to 20 carbon atoms, a phenyl group or an alkoxy group having 1 to 5 carbon atoms. Further, Me is a methyl group, and a and b are 0.
Alternatively, it is an integer of 1 or more, and a + b is 1 to 1,000. As the epoxy group-containing group, the following general formula (7)
(In the formula, R ²¹ and R ²² are alkylene groups having 1 to 4 carbon atoms, k
Is 0 or 1. Group represented by), for example, glycidyl group, γ-glycidoxypropyl group and the like.

[0060]

[Chemical 2]

As the amino-modified silicone (D2),
In the general formula (1), R ¹ , R ² , R ³ and R
⁴ of at least one of ^{-R 23 -NH (R 24 NH)} tH group-containing group (R ²³ represents an alkylene group having 1 to 5 carbon atoms, R ²⁴ is an alkylene group having 1 to 4 carbon atoms, t is from 0 to 3 Which is an integer). The rest is a methyl group with 2 to 2 carbon atoms
It may be an alkyl group having 20 carbon atoms, a phenyl group or an alkoxy group having 1 to 5 carbon atoms. Further, Me is a methyl group, and a
And b are 0 or an integer of 1 or more, and a + b is 1 to 1,
It is 000.

In the above (D1) and (D2), the carbon number is 2
Examples of the alkyl group represented by R 20 include R ^{5 of the} general formula (2).
Among those exemplified as the alkyl group in, those having a carbon number within the above range can be mentioned. Examples of the alkoxy group having 1 to 5 carbon atoms include methoxy group, ethoxy group, n- and iso-propoxy group, butoxy group and the like. Examples of the alkylene group having 1 to 5 carbon atoms (1 to 4) include methylene group, ethylene group, 1,2- and 1,3-propylene group, 1,2-, 2,3-, 1,3- and 1,4
A butylene group and the like. It is preferably a 1,3-propylene group. Among these (D), preferred ones are
Amino-modified silicone (D2), especially Mw of 500-
It is 20,000 amino-modified silicone.

The content of (D) in the oil agent (nonvolatile content) of the present invention is not particularly limited, but is preferably 20% by mass.
Hereafter, it is more preferably 0.1 to 10% by mass.

As the anti-sticking agent (E) other than (A),
It is not particularly limited as long as it is usually used as an anti-sticking agent for oil agents for elastic fibers, but higher fatty acid metal salt having 5 to 30 carbon atoms (E1), silicone resin (E2), polyether modified silicone (E3), and Other anti-sticking agents (E4) can be mentioned.

(E1) is a divalent or trivalent metal salt of a higher fatty acid having 5 to 30 (preferably 10 to 20) carbon atoms [alkaline earth metal salt (calcium salt, magnesium salt, etc.) and aluminum salt, etc. ] Etc. are mentioned. Specific examples of the higher fatty acid include those having 5 or more carbon atoms among those exemplified as the fatty acid having 1 to 30 carbon atoms which constitutes R ⁹ described above. Specific examples of (E1) include magnesium laurate, calcium laurate, aluminum laurate, magnesium myristate, calcium myristate, aluminum myristate, magnesium palmitate, calcium palmitate, aluminum palmitate, magnesium stearate, calcium stearate. , Aluminum stearate and the like. Of these, preferred are magnesium stearate, calcium stearate, and aluminum stearate.

Examples of (E2) include solid polymers having a three-dimensional structure having a high degree of branching, that is, silicone resins [those described in Silicone Handbook (edited by Kunio Ito, published by Nikkan Kogyo Shimbun), pages 466 to 515]. To be Among these, preferable ones have Mw of 1,000 to 10
A resin composed of 50,000 methyl silicone resin and an amino-modified polyorganosiloxane having Mw of 1,000 to 100,000, and more preferably
It is a methyl silicone resin having an Mw of 1,500 to 30,000.

As (E3), the K viscosity is 1,500 m.
m ² / s or less, in the general formula (1), R ¹ , R
Examples thereof include those in which at least one of ² , R ³ and R ⁴ is a polyoxyalkylene chain-containing group. The rest may be a methyl group, an alkyl group having 2 to 20 carbon atoms, a phenyl group or an alkoxy group having 1 to 5 carbon atoms. The polyoxyalkylene chain-containing group, the general formula -A ¹ -O- (A ² -O)
A group represented by q-R ²⁵ (wherein R ²⁵ is a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, A ¹ is an alkylene group having 1 to 5 carbon atoms, and A ² is an alkylene group having 1 to 4 carbon atoms. And
They may be the same or different and may be block-shaped or random-shaped. q represents an integer of 1 to 100. ), For example, the general formula _{- (CH 2) 3 -O- (} C 2 H 4 O) r (C 3 H 6 O) s-
D (D is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms,
r and s represent an integer of 0 or more, which is r + s = 1 to 100. The group shown by these is mentioned. Further, Me is a methyl group, a and b are 0 or an integer of 1 or more, and a +
b is 1 to 1,000. Note that examples of each substituent are the same as those in the above (D).

As the anti-sticking agent (E4) other than the above,
For example, mineral solid fine particles such as talc, silica, and colloidal alumina having a particle diameter of 0.5 μm or less; paraffin (having 18 to 70 carbon atoms) and polyethylene (Mw = 300).
~ 10,000) and other waxes that become solid at 25 ° C or lower; and the like. Preferred among these (E) are (E2) and (E3).

The content of (E) in the oil agent (nonvolatile content) of the present invention is not particularly limited, but is preferably 20% by mass or less, more preferably 0.1 to 10% by mass. The content of (E1) is preferably 0.5% by mass or less. These additives may be used for elastic fibers such as core spun yarn, covering, air covering, circular knitting,
Depending on warping and the like, optimum performance can be imparted by using only one kind or by using several kinds in combination.

If necessary, the oil agent of the present invention may further contain known compatibilizing components [eg, nonionic surfactants (eg, US Pat. Nos. 4,331,447 and 3,929,6).
No. 78) and higher alcohols having 6 to 24 carbon atoms such as 2-ethylhexanol, isostearyl alcohol, etc.] within a range that does not impair the performance of the oil agent for elastic fiber of the present invention. Often, the blending of these can improve the daily stability of the oil agent. Also,
Furthermore, antioxidants (hindered phenols, hindered amines, etc.), UV absorbers, and other components normally used in spinning oils can be added. The blending amount of these components in the oil agent (non-volatile content) of the present invention is preferably 0 to 10% by mass, and more preferably 0.1 to 7% by mass with respect to the compatibilizing component. The ultraviolet absorber is preferably 0 to 3% by mass, more preferably 0.1 to 1% by mass.

Viscosity of the oil agent of the present invention (hereinafter abbreviated as L viscosity)
Is preferably ² to 100 mm ² / s at 25 ° C. for uniform adhesion and prevention of roller wrapping. The L viscosity is measured by the following method. [Method of measuring L viscosity] 20 g of the sample oil agent is put into an Ubbelohde viscometer, and the temperature of the sample oil agent is adjusted to 25 ± 0.5 ° C. in a constant temperature water bath. After 30 minutes, the viscosity is measured by the Ubbelohde method.

The method for producing the oil agent of the present invention is not particularly limited, and examples thereof include ordinary stirring equipment (paddle type agitator, propeller type agitator, etc.) and heating equipment (eg 0 to 200 ° C.).
There is a method in which each component is put in a mixing tank equipped with and mixed at 40 to 120 ° C.

The oil agent may be applied in a non-hydrated state, but if desired, it may be used as a water emulsion. The non-hydrated state means that it is as it is (straight lubrication), or diluent (organic solvent, low viscosity (L viscosity 1
mineral oil (less than mm ² / s)]. The dilution ratio is not particularly limited, but the concentration of the oil agent [concentration of the total mass of the non-volatile components] is preferably 1 to 80 mass%, more preferably 5 to 70 mass%, based on the total mass of the diluted oil agent after dilution. %. As an organic solvent,
Aliphatic hydrocarbons such as hexane and pentane;
Ethers such as diethyl ether and dipropyl ether; alcohols such as methanol, ethanol and isopropanol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; aromatic hydrocarbons such as toluene and xylene; highly polar solvents such as dimethylformamide and dimethyl sulfoxide. A halogenated hydrocarbon such as chloroform and carbon tetrachloride.
As the low-viscosity mineral oil, for example, L viscosity is 1 mm ² / s
Less than liquid paraffin and refined spindle oil.

In the case of a water emulsion, it can be emulsified by a known method. For example, it can be obtained by mixing the oil agent of the present invention with an emulsifier, if necessary, and emulsifying in water. As the emulsifier, it is not necessary to add it depending on the type of the oil component, and for example, the anionic surfactant (C1) and the nonionic surfactant can be used. When using an emulsifier other than those corresponding to the above components, the amount of the emulsifier is preferably 0 to 50% based on the total mass of the oil agent (nonvolatile content) after the emulsifier is blended. As the emulsifying machine, an emulsifying tank equipped with a stirrer, a ball mill, a Gaurin homogenizer, a homodisper, a bead mill, or the like can be used. The concentration of the emulsion is not particularly limited, but the concentration of the oil agent is preferably 0.01 to 30% by mass, more preferably 0.2 to 20% by mass, based on the total mass of the emulsion after emulsification.

The oil agent of the present invention is applied to the yarn by roller lubrication or nozzle lubrication at any position after spinning in the spinning process of elastic fibers (for example, 200 to 1,200 m / min) until the yarn is wound up. Can be given. The temperature of the oil agent to be supplied is preferably 10 to 80 ° C, more preferably 1
It is 5-60 degreeC. The oil agent of the present invention is usually 0.1 to 12 (preferably 0.5) as a non-volatile component with respect to elastic fibers.
10 to 10, more preferably 1 to 8)% by mass.

Examples of elastic fibers to which the oil agent of the present invention can be applied include polyurethane elastic yarns, polyester elastic yarns, polyamide elastic yarns and polycarbonate elastic yarns. Particularly, polyurethane elastic yarns can be preferably used.
The fineness of the elastic fiber to which the oil agent of the present invention can be applied is not particularly limited, but is preferably 10 to 2,500 dtx, and more preferably 11 to 1870 dtx.

The elastic fiber treated with the oil agent of the present invention has a post-processing step (for example, air spun yarn step, covering step, air covering step, knitting step, warping step, refining step, dyeing step and finishing step). Etc.) and finished into the final product. The final products are for clothing [eg pantyhose, socks, inner foundation (bra, girdle, bodysuit, etc.), outerwear (jacket, slacks, etc.),
Sportswear (swimsuits, leotards, ski pants, etc.)] and industrial materials (eg disposable diapers, belts, etc.)
Widely applicable to etc.

[0078]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In the text and tables, parts represent parts by mass (active ingredient), and% represents mass%.

Examples 1 to 6 and Comparative Examples 1 to 3 For the elastic fibers of Examples 1 to 6 and Comparative Examples 1 to 3, each component was blended in a beaker with the composition and blending amount (parts) shown in Table 1. An oil solution was prepared. In the dry-spinning method of polyurethane elastic fiber, the oil agent of Table 1 was applied by roller oiling so that the amount of the oil agent attached was 6% with respect to the filament mass, and it was wound around cheese at 600 m / min to obtain 40D polyurethane elastic fiber. . Further, a scum preventing property test and a sticking property test were conducted by the following test methods. The evaluation results are also shown in Table 1.

<Test Method> (1) Scum Generation Prevention Test When the polyurethane elastic fiber was obtained by the above dry spinning method, the state of scum generation was observed with the naked eye and compared with the scattering state of Comparative Example 1 to obtain the following criteria. It was judged by. -Judgment Criteria- ○: Less scum than Comparative Example 1 x: Same as Comparative Example 1, or more scum than Comparative Example 1

(2) Anti-sticking property test A draw-up and take-up device of variable magnification (the ratio of draw-out speed and take-up speed can be changed) using fibers obtained by aging the taken-up cheese at 25 ° C. for 1 week To
When the yarn was sent out at a speed of 50 m / min, the yarn was shown at the lowest speed ratio that could be wound up without being caught by sticking. It is preferably 1.3 or less.

The components in Table 1 are as follows. Highly polymerized polydimethylsiloxane (A-1): X-21-
7501G (K viscosity: 22,000 mm ² / s; manufactured by Shin-Etsu Chemical Co., Ltd.) Surfactant (1) (C-2): Lauramidopropyl dimethyl betaine surfactant (2) (C-3-1): Lauramidopropyldimethylamine / carboxy modified silicone (X-22
-3710: Shin-Etsu Chemical Co., Ltd. salt surfactant (3) (C-3-2): didecyldimethylammonium lauryl alcohol EO2.5 mol adduct carboxymethylated salt polyether-modified silicone (E-3) ): L-7001
(Nippon Unicar Co., Ltd.) Amino-modified silicone (D-2): KF-8004 (Shin-Etsu Chemical Co., Ltd.) Polydimethylsiloxane (B-1): SH-2001
0 cs (K viscosity: 5 mm ² / s; manufactured by Toray Dow Corning Co., Ltd.) Mineral oil (B-2): Liquid paraffin 60S (K viscosity: 5)
mm ² / s; manufactured by Chuo Kasei Co., Ltd.) Magnesium stearate (S-M) isostearyl alcohol (I-A)

[0083]

[Table 1]

As is clear from Table 1, the oil agent for elastic fibers of the present invention is superior in both scum preventing property and anti-sticking property to the comparative example.

[0085]

EFFECT OF THE INVENTION The oil agent for elastic fibers of the present invention is superior to the conventional oil agents in both the scum preventing property and the yarn sticking preventing property. From the above effect, by using the elastic fiber oil agent of the present invention, it becomes possible to produce elastic fibers while maintaining stable operability from spinning to the post-processing step, which is extremely useful industrially. is there.

Claims (5)

[Claims] 1. The viscosity of a 30 mass% xylene solution at 25 ° C. measured by an Ubbelohde viscometer is 2,000 mm.
An oil agent for elastic fibers comprising a highly polymerized polyorganosiloxane (A) of ² / s or more and a base oil (B). 2. An antistatic agent (C), a softening agent (D),
The oil agent for elastic fibers according to claim 1, which contains one or more additives selected from the anti-sticking agents (E) other than (A) and (A). 3. The content of (A) in the oil agent is 0.01 to 5 mass% with respect to the mass of the oil agent, and the content of (B) is 70 mass% or more. The oil agent for elastic fiber described. 4. A method for treating an elastic fiber, which comprises applying the oil agent for elastic fiber according to claim 1 in an amount of 0.1 to 12% by mass based on the elastic fiber. 5. An elastic fiber treated by the treatment method according to claim 4.