JP2006083510A - Elastic fiber having 1-menthol resistance, elastic nonwoven fabric, and fiber product using these - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elastic fiber having excellent elasticity and 1-menthol resistance, capable of being given at a relatively low cost, and capable of being suitably used as a fiber product, and to provide a nonwoven fabric. <P>SOLUTION: This elastic fiber is obtained by using a hydrogenated block copolymer, wherein the copolymer contains structural units A (A is a structural unit consisting mainly of an aromatic vinyl compound monomer unit) and units B (B is a structural unit consisting mainly of a conjugated diene compound monomer unit, wherein a content of vinyl bonds in the conjugated diene compound monomer units is at least 50 wt.% and less than 80 wt.% and at least 80% of double bond residues derived from the conjugated diene monomer units are hydrogenated) in its molecule, a block structure of the copolymer is expressed by A-B-A or (A-B)<SB>n</SB>X, a content of the units A is 10-50 wt.%, a content of the units B is 90-50 wt.%, and a sum total of the content of the units A and the content of the units B is 100 wt%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elastic fiber, an elastic nonwoven fabric, and a fiber product using the same.

Conventionally, an elastic sheet has been used as a base fabric for a poultice because it is important as physical performance to fit the body. In recent years, elastic nonwoven fabrics made from various elastomer resins have been studied in order to further improve the fit.
For example, A-B-A or (A-B) composed of a structural unit (A) mainly composed of an aromatic vinyl compound monomer unit and a structural unit (B) mainly composed of a conjugated diene compound monomer unit _An elastic nonwoven fabric made of a hydrogenated block copolymer represented by _n X (where n is an integer of 2 or more and X is a coupling agent residue) is known (for example, patent document). 1).
Although this elastic nonwoven fabric has good elasticity because it has good elasticity, when it is used as a base material for a poultice and l-menthol is attached, the elastic performance is reduced and the nonwoven fabric breaks. There was a problem that would be easy, and it was not suitable for use as a poultice.
JP-A-8-13237

  Accordingly, an object of the present invention is to provide an elastic fiber and an elastic nonwoven fabric that have excellent elasticity and l-menthol resistance, and are relatively inexpensive and suitable for use as a textile product. Is to provide the textile products.

  The inventors of the present invention have intensively studied to solve the problems of the present invention. As a result, the inventors have found that the above-described problems can be solved by adopting the following configuration, and have completed the present invention based on this finding.

The present invention has the following configuration.
[1] The following structural units A and B are contained in the molecule, the block structure is represented by ABA or (AB) _n X, and the A content is 10 to 50% by weight. An elastic fiber obtained by using a hydrogenated block copolymer having a B content of 90 to 50% by weight and a sum of the A content and the B content of 100% by weight. An elastic fiber having a breaking strength after being immersed in a 5 wt% 1-menthol ethanol solution for 1 hour is 80% or more of the breaking strength before being immersed.
A: A structural unit mainly composed of an aromatic vinyl compound monomer unit.
B: 80% or more of the double bond residues derived from the conjugated diene monomer unit, mainly composed of the conjugated diene compound monomer unit, and the vinyl bond content in the conjugated diene compound monomer unit is 50% by weight or more and less than 80% by weight Is a hydrogenated component unit.
Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.
[2] The elastic fiber according to [1], wherein the hydrogenated block copolymer is a (styrene)-(ethylene-butylene)-(styrene) block copolymer.
[3] The following structural units A and B are contained in the molecule, the block structure is represented by A-B-A or (A-B) _n X, and the content of A is 10 to 50% by weight, An elastic nonwoven fabric obtained by using a hydrogenated block copolymer having a B content of 90 to 50% by weight and a sum of the A content and the B content of 100% by weight. An elastic nonwoven fabric in which the breaking strength in the machine direction after being immersed in a 1% by weight l-menthol ethanol solution is 80% or more of the breaking strength before being immersed.
A: A structural unit mainly composed of an aromatic vinyl compound monomer unit.
B: 80% of double bond residues derived from a conjugated diene compound monomer unit mainly composed of a conjugated diene compound monomer unit and having a vinyl bond content in the conjugated diene compound monomer unit of 50% by weight or more and less than 80% by weight The above are hydrogenated components.
Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.
[4] The elastic nonwoven fabric according to the above [3], wherein the hydrogenated block copolymer is a (styrene)-(ethylene-butylene)-(styrene) block copolymer.
[5] The elastic nonwoven fabric according to the item [3] or [4], wherein the elastic nonwoven fabric is made from any one of a spunbond method, a melt blow method, and a tow opening method.
[6] The elastic nonwoven fabric according to any one of [3] to [5] is laminated and integrated with at least one selected from nonwoven fabrics other than the elastic nonwoven fabric, films, webs, woven fabrics, knitted fabrics, and fiber bundles. An elastic nonwoven fabric.
[7] A fiber product using the elastic fiber according to [1] or [2].
[8] A fiber product using the elastic nonwoven fabric according to any one of [3] to [6].
[9] A poultice obtained by adhering l-menthol and an adhesive to one side of the elastic nonwoven fabric according to any one of [3] to [6].

  The elastic fiber and elastic nonwoven fabric of the present invention have excellent elasticity and excellent l-menthol resistance, and can be suitably used for fiber products that require fit to the human body. Among them, it can be suitably used for a cataplasm requiring l-menthol resistance.

The present invention will be described in detail below.
The elastic fiber of the present invention contains the following structural units A and B in the molecule, the block structure is represented by A-B-A or (A-B) _n X, and the content of A is 10 to 50 wt. An elastic fiber obtained by using a hydrogenated block copolymer in which the content of B is 90 to 50% by weight, and the sum of the content of A and the content of B is 100% by weight, It is an elastic fiber whose breaking strength after immersing the elastic fiber in a 5% by weight l-menthol ethanol solution for 1 hour is 80% or more of the breaking strength before immersing. In the present invention, the structural unit refers to a polymer block constituting the copolymer. A is a structural unit mainly composed of aromatic vinyl compound monomer units, and B is composed mainly of conjugated diene compound monomer units, and the vinyl bond content in the conjugated diene compound monomer units is 50% by weight or more and 80% by weight. It is a structural unit in which 80% or more of the double bond residue derived from the conjugated diene monomer unit is hydrogenated (hereinafter sometimes referred to as “structural unit mainly composed of conjugated diene compound monomer unit”). . Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.
The elastic nonwoven fabric of the present invention has the following structural unit A in the molecule, contain B, and block structure is represented by A-B-A or _{(A-B) n} X, the content of A is 10 An elastic nonwoven fabric obtained by using a hydrogenated block copolymer that is 50% by weight, B content is 90-50% by weight, and the sum of A content and B content is 100% by weight Yes, it is an elastic nonwoven fabric in which the breaking strength in the machine direction after the nonwoven fabric is immersed in a 5% by weight l-menthol ethanol solution for 1 hour is 80% or more of the breaking strength before immersion. A is a structural unit mainly composed of aromatic vinyl compound monomer units, and B is composed mainly of conjugated diene compound monomer units, and the vinyl bond content in the conjugated diene compound monomer units is 50% by weight or more and 80% by weight. It is a structural unit in which 80% or more of the double bond residue derived from the conjugated diene compound monomer unit is hydrogenated. Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.
As for the hydrogenated block copolymer used for this invention, it is especially preferable that 95% or more of the double bond residue derived from the conjugated diene compound monomer unit in this hydrogenated block copolymer is hydrogenated.

  The aromatic vinyl compound monomer unit mainly constituting A is contained in A by 80% by weight or more, preferably 90% by weight or more. Other monomer units other than the aromatic vinyl compound monomer unit constituting A may exist in either a random or tapered structure. If the content of the aromatic vinyl compound monomer unit is within this range, the glass transition temperature of A is not lowered, and therefore, it is preferable because sufficient elasticity can be imparted to the obtained fiber and nonwoven fabric.

The aromatic vinyl compound monomer unit used in A includes styrene, t-butylstyrene, α-methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-aminoethyl. Examples thereof include styrene and vinyl pyridine. Of these, styrene and α-methylstyrene can be preferably used.
Further, other monomer units are not particularly limited. For example, 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, , 3-hexadiene, 4,5-diethyl-1,3-octadiene, conjugated diene compound monomer units such as chloroprene. Among these, 1,3-butadiene, isoprene, 1,3-pentadiene and the like can be preferably used, and 1,3-butadiene is particularly preferably used.

  The conjugated diene compound monomer unit mainly constituting B is contained in B by 50% by weight or more, preferably 60% by weight or more, and more preferably 100% by weight. If the content of the conjugated diene compound monomer unit is within this range, it is preferable because the glass transition temperature of B does not increase and the processability during spinning becomes good.

  The vinyl bond content in the conjugated diene compound monomer unit mainly constituting B is 50% by weight or more and less than 80% by weight. B is a homopolymer of a conjugated diene polymer monomer unit or a copolymer of another monomer unit and a conjugated diene compound monomer unit. When butadiene is used as a conjugated diene compound monomer as a monomer mainly constituting B, a structural unit having a structure similar to that of a rubbery ethylene-butene copolymer or another monomer-ethylene-butene copolymer by hydrogenation It becomes. It is preferable that the vinyl bond content in the conjugated diene compound monomer unit is 50% by weight or more because good spinnability is exhibited. Here, the vinyl bond means 1,2-bond and 3,4-bond.

  Conjugated diene compound monomer units used for B include 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1 , 3-hexadiene, 4,5-diethyl-1,3-octadiene, chloroprene and the like. In particular, 1,3-butadiene, isoprene, and 1,3-pentadiene can be preferably used to obtain a hydrogenated block copolymer composition that can be industrially used and has excellent physical properties. Further, isoprene can be preferably used.

  Other monomer units used for B include styrene, t-butylstyrene, α-methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-amino. Examples include ethyl styrene and vinyl pyridine. In particular, styrene and α-methylstyrene are preferable. In B, when a conjugated diene compound monomer unit and another monomer unit are copolymerized, the distribution of the conjugated diene compound monomer unit is random, tapered (in which the monomer unit increases or decreases along the molecular chain), It may be partially block-shaped or any combination thereof.

The hydrogenated block copolymer used in the present invention is represented by a block structure of (A-B-A) or (A-B) _n X.
The content of A in the hydrogenated block copolymer is 10 to 50% by weight, preferably 10 to 40% by weight, more preferably 10 to 30% by weight, and the content of B is 90 to 50% by weight. , Preferably 90 to 60% by weight, more preferably 90 to 70% by weight.
As the hydrogenated block copolymer used in the present invention, A is styrene, B is 1,3-butadiene, the content of styrene is 10 to 50% by weight, and the content of 1,3-butadiene. A hydrogenated block copolymer having an amount of 90 to 50% by weight and having 95% or more of the double bond residues derived from the conjugated diene compound monomer unit in the hydrogenated block copolymer hydrogenated can be preferably used. One example is a (styrene)-(ethylene-butylene)-(styrene) block copolymer. This block copolymer can be obtained by hydrogenating a copolymer of styrene and 1,3-butadiene. In this block copolymer, the double bond residue derived from 1,3-butadiene units is less than 5%.

  In the present invention, as long as it is within the range that does not impair the effects of the present invention, the elastic fiber is flexible as required, such as various stabilizers, ultraviolet absorbers, thickening and branching agents, matting agents, colorants, and rubbers. It may contain an imparting agent, other various improving agents, a polymer, and the like. The polymer is a polymer other than the hydrogenated block copolymer defined in the present invention, and is not particularly limited, but is not limited to thermoplastic polymers such as polypropylene, polyethylene, polyester, polyamide, polyolefin elastomer, polyester elastomer, and polyurethane elastomer. Examples of the combination may include a hydrogenated block copolymer, or may be used as a composite component that forms a constituent layer different from the hydrogenated block copolymer in the composite fiber.

  In the present invention, the balance between the vinyl bond content and the A content in the conjugated diene compound monomer unit of B contributes to l-menthol resistance. Accordingly, when the vinyl bond content in the conjugated diene compound monomer unit of B is in the range of 50 wt% or more and less than 80 wt%, excellent l-menthol resistance is exhibited. In order to maintain good l-menthol resistance, the content of A is preferably in the range of 10 to 50% by weight.

  The elastic fiber of the present invention preferably has excellent elasticity with an elongation recovery rate of 70% or more at 50% elongation. More preferably, it is 80% or more, More preferably, it is 90% or more. If the elongation recovery rate at 50% elongation is 70% or more, sufficient elasticity can be imparted to the resulting product. Similarly, the elastic nonwoven fabric of the present invention preferably has excellent elasticity with an elongation recovery rate of 70% or more at 50% elongation. More preferably, it is 80% or more, More preferably, it is 90% or more. If the elongation recovery rate at 50% elongation is 70% or more, sufficient elasticity can be imparted to the resulting product.

  The cross-sectional shape of the elastic fiber of the present invention is preferably a round cross-section in consideration of the spinnability, but may be an irregular cross-section or a hollow cross-section as long as the spinnability is not impaired. Further, the cross-sectional structure may be a composite cross section. However, in the case of a parallel or sheath-core composite cross section, the composite component other than the hydrogenated block copolymer is preferably a component that does not inhibit the l-menthol resistance. Moreover, when using the material which the nonwoven fabric physical property falls by adhering l-menthol, the material is used only for the core part with little influence by l-menthol adhesion using the composite cross-section structure of a sheath core. Good.

  The elastic fiber of the present invention can be produced by a normal hot melt spinning method using a hydrogenated block copolymer as a raw material resin. The molten resin that has been thermally melted and discharged from the die is cooled with a coolant such as cold air or water. The discharge amount and take-up speed of the molten resin are arbitrarily set to obtain a fiber having a target fineness. Here, it is preferable to attach an oil agent to the elastic fiber in order to reduce frictional resistance with the metal and prevent adhesion between the fibers. The obtained elastic fiber is wound up for each single fiber to form a single yarn. Further, it may be wound up as a fiber bundle in which several single fibers or all are bundled at a stage where the adhesiveness after discharging the molten resin die is high. The obtained elastic fiber can also be stretched with ordinary stretching equipment. At this time, the stretching may be performed continuously from the spinning step, or may be performed discontinuously after winding once.

  The fineness of the elastic fiber of the present invention is not particularly limited, but usually 1 to 4000 dtex can be used. Preferably it is 2-3000 dtex, More preferably, it is 5-2000 dtex. The fineness here is the fineness of the fiber obtained from the single-hole nozzle. Moreover, when using with a fiber bundle, the value which multiplied the single yarn fineness and the number of composition becomes the total fineness of a fiber bundle.

  The elastic nonwoven fabric of the present invention can be obtained by a method such as a spunbond method, a melt blow method, a tow opening method, or the like. When the spunbond method or the melt blow method is used, the spun fiber can be directly converted into a web and processed into a nonwoven fabric. Moreover, when using a tow opening method, after collecting tow once, this tow can be opened and processed into a nonwoven fabric. Using tow, it can be processed into a non-woven fabric by other methods. For example, a tow can be cut into a length in the range of 5 to 60 mm, web-formed by a method such as a card method, an airlaid method, or a papermaking method, and processed into a nonwoven fabric. The elastic nonwoven fabric obtained by these methods can further increase the strength of the nonwoven fabric by methods such as the point bond method, general-purpose through-air method, point-through air method, sonic bond method, water jet method, needle punch method, and resin bond method. can do.

The basis weight of the elastic nonwoven fabric of the present invention when used alone is not particularly limited, but is preferably 5 to 300 g / m ² , more preferably 20 to 200 g / m ² , and still more preferably 50 to 150 g / m ² . is there.

  The spunbond method is a method in which a melted raw material resin is spun and stretched, opened, collected and entangled or bonded to form a nonwoven fabric. The melt blow method is a method of forming a nonwoven fabric by injecting a melted raw material resin together with high-temperature and high-pressure air and arranging the fibers for opening. The toe opening method is a method in which a long fiber bundle (tow) is stretched and the nonwoven fabric is formed by performing fiber opening and widening after crimping. Of these, the spun bond method and the melt blow method are preferred in the present invention from the viewpoints of productivity, production cost, ease of production, and texture, and the melt blow method is particularly preferred.

  As long as the effect of the present invention is not impaired, the elastic nonwoven fabric of the present invention may be blended or mixed with fibers other than the present invention. The blend ratio or blend ratio is preferably within a range that does not impair elasticity, and is preferably 40% by weight or less of the total fiber amount. In addition, the ratio may be 70% by weight or less of the total fiber amount as long as it is a fiber obtained by using a resin such as a thermoplastic elastomer that does not impair elasticity and l-menthol resistance.

  The elastic nonwoven fabric comprising the composition of the present invention is immersed in an ethanol solution of 5% by weight l-menthol for 1 hour, and then the mechanical strength (MD) breaking strength of the elastic nonwoven fabric is the machine direction (MD) before immersion. ) Of 80% or more of the breaking strength. Thus, the performance which has the outstanding l-menthol resistance is required for commercialization.

  The elastic nonwoven fabric of the present invention can be used by laminating at least one selected from films, nonwoven fabrics, webs, woven fabrics, knitted fabrics, and fiber bundles other than the elastic nonwoven fabric on at least one surface thereof. The material used for lamination is not particularly limited, but various materials can be appropriately selected and used depending on the purpose. Examples include, but are not limited to, punched nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, airlaid nonwoven fabrics, polypropylene films, polyethylene films, elastomer films, spunbond point bond nonwoven fabrics, point through air nonwoven fabrics, and general through air nonwoven fabrics. It is not something.

The basis weight of the elastic nonwoven fabric of the present invention in the case of lamination is not particularly limited, but is preferably 1 to 300 g / m ² , more preferably 3 to 200 g / m ² , and still more preferably 5 to 150 g / m ² . . Further, depending on the purpose, heat treatment may be performed after the lamination. In general, the heat treatment is performed at a temperature between the softening point of the adhesive component used and the softening point of the non-adhesive component. As a heat treatment method, a known method such as a point bond method using a heated embossing roll, a through air method using heated air, or a method using an infrared lamp can be used. Further, a processing method such as a sonic bond method, a water jet method, a needle punch method, or a resin bond method may be used.

  Since the elastic fiber and elastic nonwoven fabric of the present invention are excellent in l-menthol resistance, it is most suitable to be used as a poultice. However, other textile products, such as gloves, tablecloths, doormat backings, furniture slippers, food transport underlays, carpet backings, masks, face masks, shoe covers, mouse pads, hangers, Clothing, headrest cover, chair cover, wrapping material, floor cover, rope, shift cover, knob cover, bed sheet, bed sheet, elbow rest sheet, medical tape, bandage, flower rather, goza, medical cloth, automotive seat, It can also be used for house wrap sheets, roof base materials and adhesives. In addition, the use of the elastic nonwoven fabric of this invention is not limited to these.

The cataplasm of the present invention has a structure in which l-menthol and an adhesive are attached to one side of an elastic nonwoven fabric, and other components include analgesics such as glycol salicylate, indomethacin, ketoprofen, and felbinac. In addition, other medicinal components may be included as necessary. When used in poultices, the basis weight of the elastic nonwoven fabric is available in a range of 5 to 200 g / ^{m 2,} preferably ^{20~150g / m 2, 50~120g / m} 2 is more preferable. The adhesion amount of 1-menthol can be in the range of 1 to 20% by weight, preferably 2 to 10% by weight, and more preferably 3 to 8% by weight.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these Examples. In addition, the measurement result in the following Examples and Comparative Examples was performed by the following method.

(1) Elastic fiber elongation recovery rate (Elongation recovery rate at 50% elongation)
A fiber test piece having a length of 200 mm is prepared. Using a tensile tester Autograph AG-G (trade name, manufactured by Shimadzu Corporation), the distance between chucks was set to 100 mm, and the test piece was fixed. The film was stretched to 50% at a tensile speed of 300 mm / min, then returned at the same speed, and the load applied to the elastic nonwoven fabric was set to zero. Immediately thereafter, the film was stretched again to 50% at the same speed, and the stretched length when the load started again was measured (Lmm). The elongation recovery rate was determined according to the following formula.
Elongation recovery rate at 50% elongation (%) = {(100 ^{* 1} −L) / 100 ^{* 1} } × 100
* 1: Initial length of test piece between chucks (mm)

(2) Breaking strength of elastic fiber A fiber test piece having a length of 200 mm is produced with the machine direction as the length direction. Using a tensile tester Autograph AG-G (trade name, manufactured by Shimadzu Corporation), the distance between chucks was set to 100 mm, and the test piece was fixed. The value (N / 1000 dtex) obtained by converting the maximum strength until elongation and breaking at a tensile speed of 300 mm / min into 1000 dtex was taken as the breaking strength.

(3) Elongation recovery rate of elastic nonwoven fabric (Elongation recovery rate at 50% elongation)
A nonwoven fabric test piece having a width of 25 mm and a length of 200 mm is produced with the machine direction of the nonwoven fabric as the length direction. Using a tensile tester Autograph AG-G (trade name, manufactured by Shimadzu Corporation), the distance between chucks was set to 100 mm, and the test piece was fixed. The film was stretched to 50% at a tensile speed of 300 mm / min, then returned at the same speed, and the load applied to the elastic nonwoven fabric was set to zero. Immediately after that, it was stretched again to 50% at the same speed, and the stretched length when the load started again was defined as Lmm. The elongation recovery rate was determined according to the following formula.
Elongation recovery rate at 50% elongation (%) = {(100 ^{* 1} −L) / 100 ^{* 1} } × 100
* 1: Initial length of test piece between chucks (mm)

(4) Breaking strength of elastic nonwoven fabric Fiber test pieces having a width of 25 mm and a length of 200 mm are produced in each of the machine direction and the machine vertical direction. Using a tensile tester Autograph AG-G (trade name, manufactured by Shimadzu Corporation), the distance between chucks was set to 100 mm, and the test piece was fixed. The maximum strength (N / 25 mm) until the material was stretched and broken at a tensile speed of 300 mm / min was defined as the breaking strength.

(5) l-menthol resistance evaluation method (measurement of breaking strength maintenance ratio)
The evaluation of l-menthol resistance was judged by calculating the breaking strength maintenance rate by the following method. Two test pieces having a width of 25 mm and a length of 200 mm were prepared, one was measured for break strength as it was, and the other was immersed in an ethanol solution of 5% by weight l-menthol for 1 hour, at room temperature. After sufficiently drying, the breaking strength was measured. This measured value was applied to the following formula, and the breaking strength maintenance rate was measured. When the breaking strength of 80% or more before immersion was maintained, it was judged that the l-menthol resistance was excellent. In addition, although breaking strength measured MD and CD of the elastic nonwoven fabric, about l-menthol resistance, it determined by the breaking strength maintenance factor of MD.
Breaking strength maintenance ratio (%) = (5% by weight l-menthol breaking strength after immersion in ethanol solution / breaking strength of unimmersed testing piece) × 100

(6) Vinyl bond content The vinyl bond content was calculated by the Morero method using infrared analysis.

(7) Styrene content The styrene content was calculated from a 100 MHz, ¹ H-NMR spectrum using ethylene tetrachloride as a solvent.

(8) Hydrogenation rate Calculated from 100 MHz, 1H-NMR spectrum using ethylene tetrachloride as a solvent.

The materials used in the examples and comparative examples of the present invention are as follows (refer to Tables 1 and 2 for details of the raw material resins).
SEBS: (styrene)-(ethylene-butylene)-(styrene) block copolymer

Example 1
Resin I was used as a raw material resin. An extruder having a screw (20 mm diameter), a heating element and a gear pump, a spinner having a spinneret (1.0 mm hole diameter, 30 holes) and a cooling device, a take-up roll (godie roll) and a take-up machine Melt spinning was performed using the apparatus. A kiss roll for attaching the oil agent was installed between the take-up roll and the winder.
Resin I is put into an extruder, and the resin I is heated and melted at 250 ° C. by a heating element, and the molten resin is discharged from the spinneret at a spinning speed of 0.17 g / min per single hole. Cooling air was applied, and the oil agent was attached with a kiss roll so that the single yarns did not adhere to each other, and wound up at a speed of 2 m / min. The physical properties of the obtained elastic fiber were measured by the method described above.
The results are shown in Table 1. The obtained elastic fiber had a fineness of 850 dtex and had excellent elasticity and l-menthol resistance.

Example 2
Resin I was used as a raw material resin. Equipped with a screw (30 mm diameter), an extruder having a heating element and a gear pump, a spinneret (hole diameter: 0.3 mm, number of holes of 501 holes in a row, effective width: 500 mm), compressed air generator and air heater, and polyester net The melt blown nonwoven fabric was manufactured using the nonwoven fabric manufacturing apparatus which consists of a collection conveyor and a winder.
Resin I is put into an extruder, and the resin I is heated and melted at 230 ° C. by a heating body, and the molten resin is discharged from the spinneret at a spinning speed of 0.25 g / min per single hole by a gear pump. It was sprayed onto a collection conveyor of a polyester net running at a running speed of 2 m / min with compressed air of 98 kPa (gauge pressure) heated to ° C. The collection conveyor was installed at a distance of 25 cm from the spinneret. The blown air was removed with a suction device provided on the back side of the collection conveyor. The nonwoven fabric conveyed by the collection conveyor was wound into a roll by a winder. The physical properties of the obtained elastic nonwoven fabric were measured by the method described above.
The results are shown in Table 2. The obtained elastic nonwoven fabric had a basis weight of 60 g / m ² and had excellent elasticity and l-menthol resistance.

  Using the elastic nonwoven fabric obtained in Example 2, an analgesic containing 1-menthol component and an adhesive component were applied thereto to produce a poultice. Ten sheets of this poultice were prepared and pasted on the knees of 10 monitors for 24 hours, and the state was observed. As a result, no rash and tightening marks were left on all the monitors due to excessive tightening. Also, there was no slippage or peeling of the poultice due to insufficient tightening.

Example 3
Resin I was used as a raw material resin. Extruder with screw (40 mm diameter), heating element and gear pump, spinneret (hole diameter 0.4 mm, 120 holes), air soccer, charging method opening machine, collection conveyor with polyester net, point bond processing machine, A spunbond nonwoven fabric was produced using an apparatus comprising a winder.
Resin I is put into an extruder, resin I is heated and melted at 230 ° C. with a heating element, and the molten resin is discharged from a spinneret at a spinning speed of 0.57 g / min with a gear pump. Immediately after being introduced to soccer, it was opened with a charging method spreader and collected on a collection conveyor. The air soccer air pressure was 196 kPa. The web on the collection conveyor was put into a point bond processing machine (pressure bonding area ratio 15%) heated to an upper and lower roll temperature of 90 ° C., and the processed nonwoven fabric was wound into a roll with a winder. The physical properties of the obtained elastic nonwoven fabric were measured by the method described above.
The results are shown in Table 2. The obtained elastic nonwoven fabric had a basis weight of 60 g / m ² and had excellent elasticity and l-menthol resistance.

Example 4
Elastic fibers were produced in the same manner as in Example 1 except that Resin II was used as a raw material resin. The physical properties of the obtained elastic fiber were measured by the method described above, and the results are shown in Table 1. The obtained elastic fiber had a fineness of 850 dtex and had excellent elasticity and l-menthol resistance.

Example 5
An elastic nonwoven fabric was produced in the same manner as in Example 2 except that Resin II was used as a raw material resin. The physical properties of the obtained elastic nonwoven fabric were measured by the method described above, and the results are shown in Table 2. The obtained elastic nonwoven fabric had excellent elasticity and l-menthol resistance.

Comparative Example 1
Elastic fibers were produced in the same manner as in Example 1 except that Resin III was used as a raw material resin. The physical properties of the obtained elastic fiber were measured by the method described above, and the results are shown in Table 1. The obtained elastic fiber had a fineness of 850 dtex, a low 50% elongation recovery rate, an inferior elasticity, and a low fracture strength maintenance rate, and therefore an inferior l-menthol resistance.

Comparative Example 2
An elastic nonwoven fabric was produced in the same manner as in Example 2 except that Resin IV was used as a raw material resin. The physical properties of the obtained elastic nonwoven fabric were measured by the method described above, and the results are shown in Table 2. The obtained elastic nonwoven fabric had a low 50% elongation recovery rate, was inferior in elasticity, and had a low breaking strength maintenance rate, and was also inferior in l-menthol resistance.

Comparative Example 3
An elastic nonwoven fabric was produced in the same manner as in Example 2 except that Resin V was used as a raw material resin. The physical properties of the obtained elastic nonwoven fabric were measured by the method described above, and the results are shown in Table 2. The obtained elastic nonwoven fabric was inferior in l-menthol resistance because of its low breaking strength maintenance rate.

Claims (9)

The following structural units A and B are contained in the molecule, and the block structure is represented by ABA or (AB) _n X, the A content is 10 to 50% by weight, and the B content An elastic fiber obtained by using a hydrogenated block copolymer having an amount of 90 to 50% by weight and the sum of the content of A and the content of B being 100% by weight, the elastic fiber being 5% by weight An elastic fiber having a breaking strength after being immersed for 1 hour in 1-menthol ethanol solution is 80% or more of the breaking strength before being immersed.
A: A structural unit mainly composed of an aromatic vinyl compound monomer unit.
B: 80% or more of the double bond residues derived from the conjugated diene monomer unit, mainly composed of the conjugated diene compound monomer unit, and the vinyl bond content in the conjugated diene compound monomer unit is 50% by weight or more and less than 80% by weight Is a hydrogenated component unit.
Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.   The elastic fiber according to claim 1, wherein the hydrogenated block copolymer is a (styrene)-(ethylene-butylene)-(styrene) block copolymer. The following structural units A and B are contained in the molecule, and the block structure is represented by ABA or (AB) _n X, the A content is 10 to 50% by weight, and the B content An elastic nonwoven fabric obtained by using a hydrogenated block copolymer having an amount of 90 to 50% by weight and the sum of the content of A and the content of B being 100% by weight. An elastic nonwoven fabric in which the breaking strength in the machine direction after being immersed in an l-menthol ethanol solution for 1 hour is 80% or more of the breaking strength before being immersed.
A: A structural unit mainly composed of an aromatic vinyl compound monomer unit.
B: 80% of double bond residues derived from a conjugated diene compound monomer unit mainly composed of a conjugated diene compound monomer unit and having a vinyl bond content in the conjugated diene compound monomer unit of 50% by weight or more and less than 80% by weight The above are hydrogenated components.
Here, in the hydrogenated block copolymer represented by block structure (AB) _n X, n is an integer of 2 or more, and X is a coupling agent residue.   The elastic nonwoven fabric according to claim 3, wherein the hydrogenated block copolymer is a (styrene)-(ethylene-butylene)-(styrene) block copolymer.   The elastic nonwoven fabric according to claim 3 or 4, wherein the elastic nonwoven fabric is made from any one of a spunbond method, a melt blow method, and a toe opening method.   An elastic nonwoven fabric obtained by laminating and integrating at least one selected from nonwoven fabrics other than the elastic nonwoven fabric, films, webs, woven fabrics, knitted fabrics, and fiber bundles on the elastic nonwoven fabric according to any one of claims 3 to 5.   A textile product using the elastic fiber according to claim 1.   A fiber product using the elastic nonwoven fabric according to any one of claims 3 to 6. A poultice formed by adhering l-menthol and an adhesive to one side of the elastic nonwoven fabric according to any one of claims 3 to 6.