Treatment agent for elastic fibers, and elastic fibers

Abstract

To provide: a treatment agent for elastic fibers that is superior in uniform adhesion on elastic fibers as well as shape retainability during spinning, maintains excellent unwindability when the elastic fibers are stored for a long period of time, and exhibits excellent storage stability; and elastic fibers to which this treatment agent for elastic fibers is bonded.SOLUTION: A treatment agent for elastic fibers according to the present invention contains a mineral oil (A) and a silicone component (B) that comprises a dimethyl silicone (B1) described below and a dimethyl silicone (B2) described below. The silicone component (B) is contained within the range of 1 mass% to 35 mass% relative to the total mass of the treatment agent. The dimethyl silicone (B1) has a kinematic viscosity of 12 mm2 / s or less at 25°C; and the dimethyl silicone (B2) has a kinematic viscosity of 90 mm2 / s or more at 25°C.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a treatment agent for elastic fibers that contains two types of dimethyl silicones having specific kinematic viscosities, and to elastic fibers to which such a treatment agent for elastic fibers is attached. [Background technology]

[0002] Elastic fibers such as polyurethane-based elastic fibers have stronger interfiber adhesion than other synthetic fibers. Therefore, when the elastic fibers are spun, wound onto a package, and then pulled out from the package for processing, it is difficult to stably unwind them from the package. Furthermore, if the spun elastic fibers have poor shape retention, the wound yarn around the package may collapse. Furthermore, if the uniform adhesion of the treatment agent for elastic fibers is insufficient, thread breakage and uneven tension may occur, and there is also the problem of storage stability of the treatment agent for elastic fibers. To solve these problems, treatments for elastic fibers containing a smoothing agent such as a hydrocarbon oil that improves the smoothness of elastic fibers have been proposed. Examples include a treatment for elastic fibers containing a base component and 0.01 to 30 mass% of a nonionic surfactant with an HLB of 3 to 15 (Patent Document 1), a treatment for elastic fibers containing a base component, water, 0.1 to 20 mass% of a lower alcohol having a hydrocarbon group with 1 to 15 carbon atoms or an alkylene oxide adduct of the lower alcohol, and 0.1 to 30 mass% of an emulsifier (Patent Document 2), and an oil for elastic fibers containing a polyoxyalkylene ether-modified polysiloxane with a polyoxyethylene skeleton content of 20 to 80 mass% in the molecule (Patent Document 3). However, no oil for elastic fibers that solves all of the above problems has yet been proposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-100291 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-147675 [Patent Document 3] Japanese Patent Application Publication No. 09-268477 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a treatment agent for elastic fibers that has excellent storage stability, uniform adhesion to elastic fibers, good shape retention during spinning, and excellent unwinding properties when the elastic fibers are stored for long periods of time, and to provide elastic fibers to which such a treatment agent for elastic fibers is attached. [Means for solving the problem]

[0005] As a result of extensive research conducted by the present inventors to solve the above-mentioned problems, they discovered that by using two types of dimethyl silicones having specific kinematic viscosities in combination and incorporating specific amounts of a silicone component containing these, it is possible to obtain a treatment agent for elastic fibers that is excellent in all respects: storage stability, uniform adhesion to elastic fibers, shape retention during spinning, and unwinding properties when the elastic fibers are stored for long periods of time, thereby solving the above-mentioned problems.

[0006] Specifically, the present invention provides the following: 1. A treatment agent for elastic fibers, comprising a mineral oil (A) and a silicone component (B) containing the following dimethyl silicone (B1) and the following dimethyl silicone (B2), wherein the silicone component (B) is contained in an amount of 1 to 35 mass% based on the total mass of the treatment agent. Dimethyl silicone (B1): Kinematic viscosity at 25°C is 12 mm 2 Dimethyl silicone with a value of / s or less. Dimethyl silicone (B2): Kinematic viscosity at 25°C is 90mm 2 Dimethyl silicone with a content of 1 / s or more. 2. The treatment agent for elastic fibers according to 1., which contains the silicone component (B) in an amount of 10 to 35% by mass based on the total mass of the treatment agent. 3. The treatment agent for elastic fibers according to 1., wherein the mass ratio of the dimethyl silicone (B1) to the dimethyl silicone (B2) is dimethyl silicone (B1) / dimethyl silicone (B2)=97.5 / 2.5 to 25.0 / 75.0. 4. The mineral oil (A) has a kinematic viscosity of 10 mm at 30°C. 2 The treatment agent for elastic fibers according to 1. above, further comprising a mineral oil having a viscosity of 1 / s or less. 5. The treatment agent for elastic fibers according to 1., wherein the silicone component (B) further contains a silicone resin (B3). 6. The treatment agent for elastic fibers according to 1., further comprising a Guerbet alcohol (C). 7. An elastic fiber having the treating agent for elastic fibers according to any one of 1. to 6. adhered thereto. [Effects of the Invention]

[0007] The treatment agent for elastic fibers of the present invention has excellent storage stability, and is therefore useful because separation or precipitation does not occur during transportation or storage of the treatment agent for elastic fibers. Furthermore, the treating agent for elastic fibers of the present invention has excellent uniformity of adhesion to elastic fibers, and does not cause thread breakage or uneven tension. Furthermore, the treatment agent for elastic fibers of the present invention has excellent shape retention properties during spinning, so the wound yarn does not collapse after being wound into a package, and the package also has excellent unwinding properties when stored for a long period of time. The treating agent for elastic fibers of the present invention is excellent in all respects: storage stability, uniform adhesion to elastic fibers, shape retention during spinning, and unwinding properties, making it extremely useful. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Mineral oil (A)> The treating agent for elastic fibers of the present invention contains a mineral oil (A). Examples of the mineral oil (A) include aromatic hydrocarbons, paraffinic hydrocarbons, naphthenic hydrocarbons, etc. More specifically, examples include spindle oil, liquid paraffin, etc. As these mineral oils, one or more commercially available products specified by viscosity, etc. may be appropriately used. The mineral oil (A) of the present invention has a kinematic viscosity of 10 mm at 30°C. 2 / s or less. This embodiment is advantageous because it can further improve the shape retention of the elastic fiber treatment agent of the present invention during spinning. The elastic fiber treatment agent of the present invention has a kinematic viscosity of 10 mm at 30°C. 2 Mineral oils with a viscosity of 1 / s or less may be used in combination with other mineral oils. The treatment agent for elastic fibers of the present invention preferably contains mineral oil (A) in the range of 40 to 95 mass %, more preferably 50 to 93 mass %, and even more preferably 60 to 88 mass %, based on the total mass of the treatment agent. In the present invention, the kinematic viscosity at 30°C means a value measured using a Cannon-Fenske viscometer.

[0009] <Dimethyl silicone (B1)> The treating agent for elastic fibers of the present invention has a kinematic viscosity of 12 mm at 25°C. 2 The dimethyl silicone (B1) has a kinematic viscosity of 12 mm / s or less. 2 Two or more of the following may be used in combination: The kinematic viscosity of dimethyl silicone (B1) is 11 mm 2 / s or less is preferable, and 10 mm 2 The lower limit of the kinematic viscosity of the dimethyl silicone (B1) is not particularly limited, but is preferably 1 mm / s or less. 2 / s or more is preferable, and 2 mm 2 / s or more is more preferable, and 5 mm 2The treating agent for elastic fibers of the present invention preferably contains dimethyl silicone (B1) in the range of 1 to 34 mass %, more preferably 2 to 34 mass %, and even more preferably 2.5 to 34 mass %, based on the total mass of the treating agent.

[0010] <Dimethyl silicone (B2)> The treating agent for elastic fibers of the present invention has a kinematic viscosity of 90 mm at 25°C. 2 The dimethyl silicone (B2) has a kinematic viscosity of 90 mm / s or more. 2 Two or more types of / s or more may be used in combination. The upper limit of the kinematic viscosity of the dimethyl silicone (B2) is not particularly limited, but is preferably 100,000 mm 2 / s or less is preferable, and 50,000 mm 2 / s or less is more preferable, and 10,000 mm 2 / s or less is even more preferable. The treating agent for elastic fibers of the present invention preferably contains dimethyl silicone (B2) in the range of 0.05 to 33 mass %, more preferably 0.1 to 30 mass %, and even more preferably 0.1 to 27 mass %, based on the total mass of the treating agent.

[0011] <Silicone component (B)> The treatment agent for elastic fibers of the present invention contains the silicone component (B) containing the dimethyl silicone (B1) and the dimethyl silicone (B2) in an amount of 1 to 35 mass % based on the total mass of the treatment agent. The treatment agent for elastic fibers of the present invention contains the mineral oil (A) and the silicone component (B) and therefore not only has excellent storage stability, but also exhibits extremely excellent effects such as uniform adhesion to elastic fibers, excellent shape retention during spinning, and excellent unwinding properties when the package is stored for an extended period of time. The treatment agent for elastic fibers of the present invention preferably contains the mineral oil (A) and the silicone component (B) in an amount of 75 to 100 mass %, more preferably 85 to 100 mass %, and even more preferably 92 to 100 mass %, based on the total mass of the treatment agent. The treatment agent for elastic fibers of the present invention preferably contains the silicone component (B) in an amount of 10 to 35% by mass, based on the total mass of the treatment agent. This embodiment is advantageous because it can further improve the uniform adhesion of the treatment agent for elastic fibers of the present invention to the elastic fibers. In the silicone component (B) of the present invention, the mass ratio of the dimethyl silicone (B1) to the dimethyl silicone (B2) is preferably dimethyl silicone (B1) / dimethyl silicone (B2)=97.5 / 2.5 to 25.0 / 75.0. This embodiment is advantageous because it can further improve the storage stability of the treatment agent for elastic fibers of the present invention, shape retention during spinning, reelability, and uniform adhesion on elastic fibers. The mass ratio of the dimethyl silicone (B1) to the dimethyl silicone (B2) is more preferably dimethyl silicone (B1) / dimethyl silicone (B2)=97.5 / 2.5 to 25.5 / 74.5, and even more preferably 97.1 / 2.9 to 26.5 / 73.5.

[0012] The silicone component (B) in the present invention preferably contains a silicone resin (B3) in addition to the dimethyl silicone (B1) and the dimethyl silicone (B2). This embodiment is advantageous because it can further improve the unwinding properties of the treating agent for elastic fibers of the present invention. The silicone resin (B3) is preferably contained in an amount of 0 to 3% by mass based on the total mass of the treating agent. The silicone resin (B3) is not particularly limited in type, but is preferably selected from MQ silicone resin, MDQ silicone resin, T silicone resin and MTQ silicone resin, and more preferably selected from MQ silicone resin, MDQ silicone resin and MTQ silicone resin. Among them, when using a silicone resin selected from MQ silicone resin, MDQ silicone resin and MTQ silicone resin, it is particularly preferred to use one with an M / Q ratio of 0.5 to 1.1. The M, D, T and Q prefixed to the silicone resin are generally used as a notation method for the siloxane unit constituting the silicone resin, and M is a group represented by the general formula R 1 R 2 R 3 SiO 1 / 2 D is a monofunctional siloxane unit represented by the general formula R 4 R 5 SiO 2 / 2 T is a difunctional siloxane unit represented by the general formula R 6 SiO 3 / 2 Q is a trifunctional siloxane unit represented by the general formula SiO 4 / 2 where R 1 ~R 6 is a hydrocarbon group having 1 to 24 carbon atoms, and the general formula is -R 7 NHR 8 NH2(R 7 and R 8 is a hydrocarbon group having 2 or 3 carbon atoms) or -R 9 NH2(R 9 is a hydrocarbon group having 2 or 3 carbon atoms), an organic amino group, a vinyl group, a carbinol group, etc.

[0013] The silicone component (B) in the present invention includes, in addition to the above-mentioned dimethyl silicones (B1), (B2) and silicone resin (B3), a silicone having a kinematic viscosity of 12 mm 2 / s larger than 90mm 2In addition to dimethyl silicone having a molecular weight of less than 1 / s, organic modified silicones such as phenyl-modified silicone, amino-modified silicone, amide-modified silicone, polyether-modified silicone, aminopolyether-modified silicone, alkyl-modified silicone, alkylaralkyl-modified silicone, alkylpolyether-modified silicone, ester-modified silicone, epoxy-modified silicone, carbinol-modified silicone, mercapto-modified silicone, and polyoxyalkylene-modified silicone may be contained.

[0014] <Guerbet Alcohol (C)> The treatment agent for elastic fibers of the present invention preferably contains a Guerbet alcohol (C), which is a monohydric aliphatic alcohol having a branched chain at the β-position of the alkyl chain. This embodiment is advantageous because it can further improve the storage stability of the treatment agent for elastic fibers of the present invention. Specific examples of the Guerbet alcohol (C) include 2-ethyl-1-propanol, 2-ethyl-1-butanol, 2-ethyl-1-hexanol, 2-ethyl-1-octanol, 2-ethyl-decanol, 2-butyl-1-hexanol, 2-butyl-1-octanol, 2-butyl-1-decanol, 2-hexyl-1-octanol, 2-hexyl-1-decanol, 2-octyl-1-decanol, 2-octyl-1-dodecanol, 2-hexyl-1-octanol, 2-hexyl-1-dodecanol, 2-(1,3,3-trimethylbutyl)-5,7,7-trimethyl-1-octanol, 2-(4-methylhexyl)-8-methyl-1-decanol, and 2-(1,5-dimethylhexyl)-5,9-dimethyl-1-decanol. As the Guerbet alcohol (C), a Guerbet alcohol having 6 to 24 carbon atoms is preferred, and a Guerbet alcohol having 12 to 24 carbon atoms is more preferred.

[0015] <Other ingredients (D)> The treating agent for elastic fibers of the present invention can be used in combination with other components (D), such as ester oils produced from fatty acids and alcohols, antistatic agents, antifoaming agents, antioxidants, preservatives, and rust inhibitors. The amount of other components (D) used in combination can be determined within a range that does not impair the effects of the present invention.

[0016] Due to the above-mentioned constitution, the treatment agent for elastic fibers of the present invention has excellent storage stability, uniform adhesion to elastic fibers, and good shape retention during spinning, and exhibits excellent effects in all aspects of unwinding properties when the elastic fibers are stored for long periods of time. It is believed that the treatment agent for elastic fibers of the present invention, which contains dimethyl silicone (B1) as an essential component, improves the wettability of the treatment agent for elastic fibers to elastic fibers, resulting in more uniform adhesion of the treatment agent. Furthermore, the treatment agent for elastic fibers of the present invention, in addition to having dimethyl silicone (B2) as an essential component, also contains mineral oil (A) as an essential component and silicone component (B) in an amount of 1 to 35 mass % relative to the total mass of the treatment agent, which is thought to suppress yarn slippage between elastic fibers and improve the shape retention of the wound yarn. Furthermore, since the treatment agent for elastic fibers of the present invention contains dimethyl silicone (B2) as an essential component, it is believed that the dimethyl silicone (B2) forms a strong oil film on the elastic fibers, suppressing adhesion between the fibers and improving the unwinding properties of the elastic fibers when stored for long periods of time. The treating agent for elastic fibers of the present invention is thought to have improved stability during storage at low temperatures (5°C) due to its constitution containing dimethyl silicone (B1) and dimethyl silicone (B2) as essential components.

[0017] <Elastic fiber> Specific examples of elastic fibers to which the treatment agent for elastic fibers of the present invention is applied include, but are not limited to, polyester-based elastic fibers, polyamide-based elastic fibers, polyolefin-based elastic fibers, polyurethane-based elastic fibers, etc. Among these, polyurethane-based elastic fibers are preferred. In such cases, the effects of the present invention can be more effectively achieved. The amount of the treatment agent for elastic fibers of the present invention to be applied to the elastic fibers is not particularly limited, but from the viewpoint of further improving the effects of the present invention, it is preferably applied in the range of 0.1% by mass to 10% by mass.

[0018] The method for producing elastic fibers of the present invention is achieved by oiling elastic fibers with the treating agent for elastic fibers of the present invention. The method for oiling the treating agent is preferably a neat oiling method without dilution, in which the agent is applied to the elastic fibers during the spinning process of the elastic fibers. Known methods for application, such as roller oiling, guide oiling, and spray oiling, can be used. An oiling roller is typically positioned between the spinneret and the take-up traverse, and this method can also be used in the production method of the present invention. Among these, it is preferable to apply the treating agent for elastic fibers of the present invention to elastic fibers, such as polyurethane-based elastic fibers, using an oiling roller positioned between stretching rollers, in order to significantly exhibit the effects of the present invention. The method for producing the elastic fiber itself used in the present invention is not particularly limited, and it can be produced by a known method. Examples include wet spinning, melt spinning, dry spinning, etc. Among these, dry spinning is preferably used from the viewpoint of excellent quality of the elastic fiber and production efficiency. [Example]

[0019] The present invention will be described below with reference to examples, but the technical scope of the present invention is not limited to these examples. In the following examples and comparative examples, parts means parts by mass, and % means % by mass.

[0020] <Treatment agents for elastic fibers of Examples 1 to 24 and Comparative Examples 1 to 11> The elastic fiber treatment agents of Examples 1 to 24 are shown in Table 1 below, and the elastic fiber treatment agents of Comparative Examples 1 to 11 are shown in Table 2 below. Each elastic fiber treatment agent was prepared by thoroughly mixing the components to make them uniform based on the composition shown.

[0021] [Table 1]

[0022] [Table 2]

[0023] Details of each component listed in Table 1 are as follows: <Mineral oil (A)> A-1: Kinematic viscosity 4.4mm 2 / s (30℃) mineral oil A-2: Kinematic viscosity 9.0mm 2 / s (30℃) mineral oil A-3: Kinematic viscosity 9.4mm 2 / s (30℃) mineral oil A-4: Kinematic viscosity 9.8mm 2 / s (30℃) mineral oil A-5: Kinematic viscosity 11.4mm 2 / s (30℃) mineral oil A-6: Kinematic viscosity 12.8mm 2 / s (30℃) mineral oil A-7: Kinematic viscosity 13.5mm 2 / s (30℃) mineral oil A-8: Kinematic viscosity 37.0mm 2 / s (30℃) mineral oil

[0024] <Dimethyl silicone (B1)> B1-1: Kinematic viscosity 5mm 2 / s (25℃) dimethyl silicone B1-2: Kinematic viscosity 10mm 2 / s (25℃) dimethyl silicone B1-3: Kinematic viscosity 9mm 2 / s (25℃) dimethyl silicone <Dimethyl silicone (B2)> B2-1: Kinematic viscosity 100mm 2 / s (25℃) dimethyl silicone B2-2: Kinematic viscosity 1000mm 2 / s (25℃) dimethyl silicone B2-3: Kinematic viscosity 3000mm 2 / s (25℃) dimethyl silicone B2-4: Kinematic viscosity 10000mm 2 / s (25℃) dimethyl silicone B2-5: Kinematic viscosity 90mm 2 / s (25℃) dimethyl silicone <Silicone resin (B3)> B3-1: Amino-modified silicone resin B3-2: Silicone resin <Other silicone ingredients> B4-1: Kinematic viscosity 15mm 2 / s (25℃) dimethyl silicone B4-2: Kinematic viscosity 50mm 2 / s (25℃) dimethyl silicone B4-3: Kinematic viscosity 4 mm 2 / s(25℃) of cyclic siloxane pentamer B4-4: Kinematic viscosity 60mm 2 / s (25°C) amino-modified silicone (monoamine type, equivalent weight 4100g / mol) B4-5: Kinematic viscosity 450mm 2 / s (25℃) amino-modified silicone (diamine type, equivalent weight 5700g / mol)

[0025] <Guerbet Alcohol (C)> C-1: 2-butyloctanol C-2: 2-Hexyldecanol C-3: 2-octyldodecanol <Other ingredients> D-1: Tetrabutylphosphonium salt of alkylbenzenesulfonic acid D-2: Glycerin condensate (average condensation degree = 5) and ricinoleic acid ester D-3: Sodium salt of di(2-ethylhexyl)sulfosuccinic acid

[0026] <Evaluation method and criteria> (1) Evaluation of storage stability of treatment agents [Method for evaluating storage stability of processing agents] The treatment agents for elastic fibers of the above Examples and Comparative Examples were allowed to stand for one month in an environment of 5°C, and the storage stability of the treatment agents was evaluated according to the following criteria. [Evaluation criteria for storage stability of processing agents] ◎◎: No precipitation or separation occurred, and the solution remained homogeneous, just like when it was prepared. ◎: A very small amount of precipitation occurs, but when left standing at room temperature, the solution returns to a homogeneous state, just like when it was prepared. 〇: Precipitation occurs, but stirring at room temperature restores the solution to a homogeneous state, just as when it was prepared. ×: Precipitation and separation occur. Even when stirred at room temperature, the mixture does not return to a homogeneous state.

[0027] (2) Evaluation of uniform adhesion [Method for evaluating uniform adhesion] Using a friction measurement meter (SAMPLE FRICTION UNIT MODEL TB-1, manufactured by Eiko Sokki Co., Ltd.), a chrome-plated, satin-finished pin with a diameter of 1 cm and a surface roughness of 2S was placed between two free rollers, and polyurethane elastic fibers pulled out from a polyurethane elastic fiber package were set so that the contact angle was 90 degrees against the chrome-plated, satin-finished pin. Under conditions of 25°C and 60% RH, an initial tension (T1) of 5 g was applied to the entry side, and the web was run at a speed of 100 m / min. The secondary tension (T2) on the exit side was measured every 0.1 seconds for 1 minute. The standard deviation of T2 was calculated and evaluated according to the following criteria. [Evaluation criteria for uniform adhesion] ◎◎: Standard deviation of T2 is less than 1.5 (The oil is evenly applied, and there is almost no fluctuation in tension when the fiber rubs against the chrome-plated matte pin.) ◎: The standard deviation of T2 is 1.5 or more and less than 1.7 (the oil is applied almost uniformly, and there is a slight fluctuation in tension when the fiber rubs against the chrome-plated matte pin, but this does not pose a problem for operation.) ○: The standard deviation of T2 is 1.7 or more and less than 2.0 (the oil is applied almost uniformly, and although there is tension fluctuation when the fiber rubs against the chrome-plated matte pin, this does not pose a problem for operation.) ×: The standard deviation of T2 is 2.0 or more (the oil is not evenly applied, and when the fiber rubs against the chrome-plated matte pin, the tension fluctuates greatly, causing problems during operation).

[0028] (3) Evaluation method for shape retention [Evaluation method for shape retention] A 5.0% amount of the treatment agent was applied to 20 denier polyurethane elastic fiber using the nozzle oiling method, and 500 g of the fiber was wound onto a 57 mm long cylindrical paper tube at a winding speed of 550 m / min via a traverse guide that gave a winding width of 42 mm using a surface drive winder, to obtain a polyurethane elastic fiber package. The maximum winding width (Wmax) and minimum winding width (Wmin) of the obtained polyurethane elastic fiber package were measured, and the bulge (the difference between the two, "Wmax-Wmin") was calculated and evaluated according to the following criteria. [Evaluation criteria for shape retention] ◎◎: Bulge is less than 3mm ◎: Bulge is 3mm or more and less than 4.5mm ○: Bulge is 4.5mm or more and less than 6.0mm ×: Bulge is 6.0mm or more

[0029] (4) Evaluation of unwinding properties [Method for evaluating unwinding properties] The delivery section was formed on one side by a first drive roller and a first free roller that was in constant contact with it, and the winding section was formed on the other side by a second drive roller and a second free roller that was in constant contact with it, and the winding section was installed 20 cm horizontally away from the delivery section. The polyurethane elastic fiber package treated with each treatment was attached to the first driving roller, unwound until the thickness of the spool reached 2 mm, and then wound onto the second driving roller. The feed speed of the polyurethane-based elastic fiber from the first drive roller was fixed at 50 m / min, while the winding speed of the polyurethane-based elastic fiber onto the second drive roller was gradually increased from 50 m / min to forcibly unwind the polyurethane-based elastic fiber from the package. During this forced unwinding, the winding speed V (m / min) was measured at the point when the polyurethane elastic fiber stopped dancing between the let-off section and the winding section, and the unwinding property (%) was calculated using the following formula and evaluated according to the following criteria. [Calculation formula] Unwindability (%)=(V-50)÷50×100=(V-50)×2 [Evaluation criteria for unwinding] ◎◎: Unwinding ability is less than 150% (there is no problem at all and it can be unwound stably). ◎: Unwinding ability is 150% or more but less than 165% (there is a slight resistance when pulling out the yarn, but there is no yarn breakage and there are no problems with operation.) ○: Unwinding property is 165% or more but less than 180% (there is resistance when pulling out the yarn, but there is no yarn breakage and there is no problem with operation). ×: Unwinding property is 180% or more (there is resistance to pulling out the yarn. Yarn breakage may occur, which is a problem during operation.)

[0030] The evaluation results of (1) storage stability of the treatment agent, (2) uniform adhesion, (3) shape retention, and (4) unwinding property are summarized in Table 3 for the treatment agents for elastic fibers of Examples 1 to 24, and in Table 4 for the treatment agents for elastic fibers of Comparative Examples 1 to 11. [Table 3]

[0031] [Table 4]

[0032] As shown in Tables 1 to 4 above, Examples 1 to 24, which are specific examples of the treatment agent for elastic fibers of the present invention, were confirmed to be very useful, as all evaluation results for (1) storage stability of the treatment agent, (2) uniform adhesion, (3) shape retention, and (4) unwinding ability were in the range of good (◎◎) to no problems in operation (○). In contrast, Comparative Examples 1 and 2, in which the content of silicone component (B) relative to the total mass of the treatment agent is outside the range of the present invention, and Comparative Example 3, which does not contain dimethyl silicone (B2), were found to be inferior in (3) shape retention when compared with the treatment agent for elastic fibers of the present invention, for example, Example 14. Furthermore, it was revealed that Comparative Example 5, which did not contain the mineral oil (A) of the present invention, was inferior in (1) the storage stability of the treatment agent and (3) the shape retention, Comparative Examples 6 and 7, which did not contain the dimethyl silicone (B1) of the present invention, were inferior in (1) the storage stability of the treatment agent and (2) the uniform adhesion, and Comparative Example 9, which did not contain either the dimethyl silicone (B1) or the dimethyl silicone (B2) of the present invention, was inferior in (1) the storage stability of the treatment agent, (2) the uniform adhesion, and (4) the reelability.

Claims

1. A treatment agent for elastic fibers, comprising a mineral oil (A) and a silicone component (B) containing the following dimethyl silicone (B1) and the following dimethyl silicone (B2), wherein the silicone component (B) is contained in an amount of 1 to 35 mass% based on the total mass of the treatment agent. Dimethyl silicone (B1): kinematic viscosity at 25 ° C. of 12 mm ２ / s or less dimethyl silicone. Dimethyl silicone (B2): kinematic viscosity at 25 ° C. of 90 mm ２ / s or more.

2. 2. The treatment agent for elastic fibers according to claim 1, wherein the silicone component (B) is contained in an amount of 10 to 35% by mass based on the total mass of the treatment agent.

3. 2. The treatment agent for elastic fibers according to claim 1, wherein the mass ratio of the dimethyl silicone (B1) to the dimethyl silicone (B2) is dimethyl silicone (B1) / dimethyl silicone (B2)=97.5 / 2.5 to 25.0 / 75.

0.

4. The mineral oil (A) has a kinematic viscosity of 10 mm at 30°C. ２ 2. The treatment agent for elastic fibers according to claim 1, further comprising a mineral oil having a viscosity of not more than 1 / s.

5. 2. The agent for treating elastic fibers according to claim 1, wherein the silicone component (B) further contains a silicone resin (B3).

6. The treatment agent for elastic fibers according to claim 1, further comprising a Guerbet alcohol (C).

7. An elastic fiber having the treating agent for elastic fibers according to any one of claims 1 to 6 attached thereto.

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