JP4779497B2 - Elastic nonwoven fabric and textiles using the same - Google Patents

Description

  The present invention relates to a stretchable nonwoven fabric and a textile product using the same. More specifically, the present invention relates to a stretchable nonwoven fabric having excellent stretchability, excellent flexibility, excellent antiblocking property and excellent texture, and a textile product using the same.

  In recent years, stretchable nonwoven fabrics have been favorably used to improve the fit to the body. Among these, nonwoven fabrics using thermoplastic elastomers are flexible and rich in stretch properties, and are therefore used in various applications such as disposable diapers, clothes, caps, bandages, tapes, supporters, gloves, and the like. On the other hand, most thermoplastic elastomers have excellent stretchability, but have the property of increasing the tackiness as the stretchability is improved. Therefore, stretchable nonwoven fabrics using thermoplastic elastomers with high stretchability are not suitable for applications that are applied to the skin under clothing because they fuzz, slip, and peel due to friction with clothing. May decrease.

  In addition, when manufacturing and storing stretchable nonwoven fabrics, especially during storage in the summer, high temperatures and load loads tend to cause sticking between fibers. In the feeding operation, excessive tension is required for the stretchable nonwoven fabric, which causes a problem that the stretchable nonwoven fabric is deformed or broken when severe. Thus, the phenomenon that fibers and non-woven fabrics stick together is called “blocking”, which is a problem when handling stretchable fibers and non-woven fabrics. The property of preventing blocking is referred to as “anti-blocking property”, and an elastic nonwoven fabric having no tackiness, that is, excellent in anti-blocking property is desired.

  In addition, as a method for forming a thermoplastic elastomer into a nonwoven fabric, a melt blow method and a spun bond method are known, but at the time of production, sticking to a production facility such as a conveyor net or a subsequent moving means occurs, and the basis weight is particularly high. When obtaining a low nonwoven fabric, it is difficult to obtain it stably industrially. Some thermoplastic elastomers have good antiblocking properties when used for nonwoven fabrics (for example, a kind of polyurethane elastomer), but that alone cannot solve the problem of obtaining good flexibility and texture.

  Among thermoplastic elastomers, polystyrene elastomers in particular are excellent in stretchability and have a lower material hardness than other thermoplastic elastomers, so the resulting stretchable nonwoven fabric is excellent in stretchability and flexibility. There was a problem that the adhesiveness was strong and blocking phenomenon occurred. In addition, while having high stretchability at low stress, there is a problem that the stress retention is not sufficient.

  In order to solve such a problem, a method for obtaining a stretchable nonwoven fabric using a composition in which a polyolefin such as polypropylene and polyethylene is mixed with a polystyrene elastomer as a material has been proposed (for example, see Patent Document 1). However, the stretchable nonwoven fabric obtained by this method has insufficient stress retention, and since the polyolefin component is not sufficiently present on the nonwoven fabric surface, sufficient antiblocking properties cannot be obtained, and stretchability Further, since the polypropylene resin having poor flexibility is mixed, the stretchability and flexibility are not sufficient, and further improvement is desired for use in the above applications.

  In addition, after mixing an ethylene-α-olefin copolymer which has elasticity with (styrene)-(ethylene-butylene)-(styrene) block copolymer and is weak in thermoplastic elastomer. A method for obtaining a stretchable nonwoven fabric has been proposed (see, for example, Patent Document 2). By using an ethylene-α-olefin copolymer, the stretchability is excellent, but since a high stress is required for stretching, the flexibility is poor, and the ethylene-α-olefin copolymer is still sufficiently present on the nonwoven fabric surface. As a result, sufficient antiblocking properties were not obtained.

  Further, a mixed fiber nonwoven fabric in which different types of molten polymers are simultaneously extruded from different nozzles arranged on the same die and fibers made of different polymers are mixed is disclosed (for example, see Patent Document 3). However, this is an invention in which different fibers are simply mixed and does not serve the purpose of obtaining a product excellent in both stretchability and antiblocking performance.

Japanese Patent Publication No. 7-81230 JP-A-9-105056 JP 2002-242069 A

  An object of the present invention is to provide a stretchable nonwoven fabric having excellent stretchability, excellent flexibility, excellent antiblocking properties, and excellent texture, and a fiber product using the same.

  The inventors of the present invention focused on a polystyrene elastomer excellent in stretchability (particularly at low stress), but it was clear that a nonwoven fabric made of itself could not solve the problem of the blocking phenomenon. In general, fibers that are made of the same kind of thermoplastic elastomer have a blocking phenomenon due to the stickiness caused by the compatibility, while the blocking phenomenon hardly occurs at the contact point between fibers obtained by using different types of thermoplastic elastomers. I was paying attention. This is considered due to the low compatibility between different types of elastomers. Although it is difficult to mix and spin different types of elastomer resins with low compatibility, spinning and non-woven fabrics are extremely easy if they are mixed. When these non-woven fabrics are brought into contact with each other, different types of thermoplastic resins are used. It has been found that the blocking phenomenon can be efficiently suppressed by increasing the number of contacts between elastomers. The present invention has been completed based on such findings.

The present invention is constituted by the following.
(1) Obtained using a mixed fiber web in which the fiber (weight) ratio of fibers obtained using the first component resin and fibers obtained using the second component resin is in the range of 20:80 to 95: 5. The first component resin is a polystyrene elastomer, and the polystyrene elastomer is (1) at least one polymer block (a) obtained mainly using an aromatic vinyl compound, mainly a conjugated diene. A block copolymer having at least one polymer block (b) obtained by using a compound and having a part of a double bond derived from a conjugated diene part hydrogenated, or (2) a conjugated diene part. A random copolymer of an aromatic vinyl compound and a conjugated diene compound in which a part of the derived double bond is hydrogenated, and the second component resin is other than a polystyrene elastomer Thermoplastic elastomers der is, stretchable nonwoven fabric at 100% elongation of the elongation recovery ratio is equal to or less than 70% of.
However, the second component resin is an ethylene-α-olefin copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and the molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (GPC). Is 3.5 or less, and the ethylene-α-olefin copolymer satisfies the following a) to c) and is substantially linear, and at least of the α-olefin having 3 to 20 carbon atoms: Except when one type is an ethylene-α-olefin copolymer that is uniformly branched.
a) Density is 0.90 g / cm ³ or less b) Melt mass flow rate ratio (I ₁₀ / I ₂ ) is 6 or more.
c) The ratio (I ₁₀ / I ₂ ) between the molecular weight distribution (Mw / Mn) and the melt mass flow rate is in the relationship of the following formula.
4.63 ≦ (I ₁₀ / I ₂ ) − (Mw / Mn)
(2) The stretchable nonwoven fabric according to (1), wherein the thermoplastic elastomer of the second component resin is at least one selected from the group consisting of polyurethane elastomers, polyamide elastomers, polyester elastomers, and polyolefin elastomers.
(3) The stretchable nonwoven fabric according to (1) or (2), wherein the stretchable nonwoven fabric is a long-fiber nonwoven fabric obtained by a spunbond method.
(4) The stretchable nonwoven fabric according to (1) or (2), wherein the stretchable nonwoven fabric is a long fiber nonwoven fabric obtained by a melt blow method.
(5) The stretchable nonwoven fabric according to any one of (1) to (4), wherein the peel strength when the stretchable nonwoven fabrics are overlapped is equal to or less than the strength at 50% elongation of the nonwoven fabric. .
(6) The stretchable nonwoven fabric according to any one of (1) to (5) above, and at least one article selected from nonwoven fabrics other than the stretchable nonwoven fabric, film, web, woven fabric, knitted fabric, and tow Composite non-woven fabric laminated.
(7) A textile product using the stretchable nonwoven fabric according to any one of (1) to (5) or the composite nonwoven fabric according to (6).

  The stretchable nonwoven fabric of the present invention is excellent in stretchability and flexibility, and is excellent in anti-blocking properties and texture. Particularly, disposable diapers, clothes, caps, bandages, tapes that require an appropriate fit and stretchability. Can be suitably used for various textile products.

Hereinafter, the present invention will be described in detail.
In the stretchable nonwoven fabric of the present invention, the fiber mixing ratio (weight ratio) of fibers obtained using the first component resin (polystyrene elastomer) and the second component resin (thermoplastic elastomer) is in the range of 5:95 to 95: 5. A stretchable nonwoven fabric obtained by using a mixed fiber, wherein the nonwoven fabric has a recovery at 70% elongation of 100% or more, and the polystyrene elastomer of the first component resin is (1) mainly an aromatic vinyl compound One of the double bonds derived from the conjugated diene moiety and having at least one polymer block (a) obtained by using at least one polymer block (b) mainly obtained by using a conjugated diene compound. A block copolymer in which a part is hydrogenated, or (2) a run of an aromatic vinyl compound and a conjugated diene compound in which a part of a double bond derived from a conjugated diene part is hydrogenated. An arm copolymer, the second component resin to the first component resin a stretchable nonwoven fabric, which is a different thermoplastic elastomers.

  As the polystyrene elastomer constituting the first component resin of the present invention, a copolymer of an aromatic vinyl compound and another comonomer can be used. As other comonomers, monomers that can be copolymerized with aromatic vinyl compounds can be used, diene compounds such as butadiene, isoprene, chloroprene, olefins such as ethylene, propylene, butene, hexene, (meth) acrylic acid or ( Examples thereof include ester compounds obtained by using (meth) acrylic acid and alcohols such as methanol, ethanol, butanol, and hexanol.

  Among them, as the polystyrene elastomer, (1) at least one polymer block (a) obtained mainly using an aromatic vinyl compound and at least one polymer block (b) obtained mainly using a conjugated diene compound are used. Or a styrene block copolymer in which some of the double bonds derived from the conjugated diene moiety are hydrogenated, or (2) an aromatic in which some of the double bonds derived from the conjugated diene moiety are hydrogenated A random copolymer of an aromatic vinyl compound and a conjugated diene compound is preferred. In addition, “mainly” means that the above-mentioned compound constituting the polymer blend may contain other constituent units under the condition that it constitutes at least 50% by weight in the constituent units of the polymer block. And “other structural units” include ethylene, propylene, butylene and the like.

Examples of the aromatic vinyl compound constituting the styrene block copolymer include styrene, α-methylstyrene, vinyltoluene, p-tert-butylstyrene and the like, and styrene is particularly preferable. These aromatic vinyl compounds may be used alone or in combination of two or more. Examples of the conjugated diene compound constituting the styrene block copolymer include 1,3-butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, and the like. Isoprene is preferred. These may be used alone or in combination of two or more. The styrene block copolymer is a styrene block copolymer in which a part of the double bond derived from the conjugated diene moiety is hydrogenated from the viewpoint of stability of the compound, spinnability, etc., preferably ethylene · α -Olefin Copolymer Styrene-Ethylene / Butylene-Styrene Block Copolymer "Ethylene / α-Olefin Copolymer"
↓
"Ethylene-α-olefin copolymer"


"Styrene-ethylene / butylene-styrene block copolymer"
↓
"(Styrene)-(ethylene-butylene)-(styrene) block copolymer" has a hydrogenation rate of the double bond of 80% or more.

  Specific examples of such a styrene block copolymer include (styrene)-(ethylene-butylene)-(styrene) block copolymer (SEBS), (styrene)-(ethylene-propylene)-(styrene). Examples thereof include block copolymers (SEPS) and block copolymers such as (styrene)-(ethylene-butylene)-(olefin crystal) block copolymer (SEBC). As specific examples of product names, KRATON G (trade name, manufactured by Kraton Polymer Japan Co., Ltd.), SEPTON (trade name, manufactured by Kuraray Co., Ltd.), Tuftec (trade name, manufactured by Asahi Kasei Chemicals Corporation), JSR DYNARON ( Trade name, manufactured by JSR Corporation).

  The random copolymer of the polystyrene elastomer is a hydrogenated styrene-diene copolymer in which a part of the double bond derived from the conjugated diene moiety constituting the random copolymer is hydrogenated. The hydrogenation rate of the double bond is 80% or more.

  Examples of the conjugated diene compound constituting the hydrogenated styrene-diene copolymer include 1,3-butadiene, isoprene, 1,3-pentadiene, 2,2-dimethylbutadiene, and 3-ethylbutadiene. 1,3-butadiene, isoprene, and 1,3-pentadiene are preferable, and 1,3-butadiene is more preferable. Examples of the aromatic vinyl compound constituting the hydrogenated styrene-diene copolymer include styrene, α-methylstyrene, p-methylstyrene, p-ethylstyrene, vinylnaphthalene and the like. Styrene, p-methylstyrene, and p-ethylstyrene are preferable, and styrene is more preferable.

The hydrogenated styrene-diene copolymer (HSBR) is a copolymer of at least one conjugated diene compound and 3 to 50% by weight of an aromatic vinyl compound, and has a molecular weight distribution (Mw / Mn = weight average). Olefinically unsaturated bond of a copolymer having a molecular weight / number average molecular weight) of 10 or less and a vinyl bond content of the diene moiety constituting the hydrogenated styrene-diene copolymer of 10 to 90% by weight. A copolymer in which at least 80% is hydrogenated is preferred.
Specific examples of the product name include JSR DYNARON (trade name, manufactured by JSR Corporation).

  The “fiber obtained using the first component resin” of the present invention may contain a resin component other than the first component as long as the effects of the present invention are not impaired.

  The second component resin constituting the stretchable nonwoven fabric of the present invention is obtained using a thermoplastic elastomer other than polystyrene elastomer. Thermoplastic elastomers have the same elastic properties as vulcanized rubber at room temperature (20-30 ° C) (depending on the soft segment in the molecule), and existing fiber spinning machines at high temperatures, just like ordinary thermoplastic resins. Is a polymer material that can be spun using as is (by the hard segment in the molecule).

  The thermoplastic elastomer of the second component resin is a thermoplastic elastomer different from the polystyrene elastomer that is the first component resin of the present invention. When a polystyrene elastomer similar to the first component resin is used as the second component resin, the non-woven fabric is wound into a roll, and when the roll is fed out by the user, the adhesive strength becomes strong and it may be difficult to feed out. In severe cases, overlapping parts may be integrated. This is because the proportion of the same component on the nonwoven fabric surface increases, and the tackiness increases due to affinity.

  The thermoplastic elastomer is preferably a polyurethane elastomer, a polyamide elastomer, a polyester elastomer, or a polyolefin elastomer from the viewpoint of processability and stretchability.

  The polyurethane elastomer is not particularly limited, and any conventionally known melt-spinnable one can be used. Such a polyurethane elastomer is a polymer obtained by polycondensing a polyol component, an organic diisocyanate, and a low molecular weight compound having two or more active hydrogen atoms as a chain extender, and these three components are mixed together for polycondensation. It may be produced by a one-shot method, or may be produced by a prepolymer method in which a polyol component and an organic diisocyanate are first reacted to form a prepolymer, and then a chain extender is added and reacted.

  Preferred polyol components include polymers having an average molecular weight of 500 to 3000, such as polyester diol by polycondensation of low molecular weight diol and dicarboxylic acid, polylactone diol obtained by ring-opening polymerization of lactam, polyoxyalkylene glycol, and polyalkylene carbonate glycol. Glycol. More specifically, an aliphatic diol or alicyclic diol having 2 to 12 carbon atoms such as ethylene glycol, bropandiol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 1,11-undecanediol 1,12-dodecanediol, 2- or 3-methyl-1,7-heptanediol, 2- or 3-methyl-1,8-octanediol, ω, ω′-dihydroxy-1,4-dimethylcyclohexane, etc. At least one diol selected from a linear or side chain fatty diol or alicyclic diol, and an aliphatic dica Reacting with rubonic acid, for example, at least one dicarboxylic acid or ester selected from succinic acid, glutamic acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, dodecanedicarboxylic acid, or esters of these dicarboxylic acids And polyester diol having an average molecular weight of 600 to 3000.

  Examples of organic diisocyanates include aromatic or aliphatic diisocyanates such as phenylene diisocyanate, tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-dicyclohexylmethane diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, and xylylene diisocyanate. And organic diisocyanates selected from aliphatic diisocyanates or diisocyanates having a naphthalene ring as necessary.

Examples of the chain extender include low molecular weight compounds having two or more active hydrogen atoms selected from diols, amino alcohols, hydrazines, diamines, triols, and the like. Preferred examples of the chain extender include 1,4-butanediol and p, p′-bishydroxyethoxybenzene.
A typical example is a thermoplastic polyurethane obtained by selecting a polyol, an organic diisocyanate, and a chain extender with a desired composition and polymerizing them by a melt polymerization method, a bulk polymerization method, or a solution polymerization method.

  Examples of the polyamide elastomer include polyether ester amides in which a hard segment obtained mainly using polyamide and a soft segment obtained using polyether diol are linked by an ester bond with a dicarboxylic acid (binder). , And polyether amides in which these are linked by an amide bond. Examples of the polyamide constituting the hard segment include nylon 6, nylon 66, nylon 610, nylon 11, and nylon 12. Examples of the polyether diol constituting the soft segment include polyethylene oxide, polypropylene oxide, polytetramethylene oxide, polyhexamethylene oxide, and polyethylene oxide-polypropylene oxide block copolymer. In addition, those obtained by copolymerizing other diols such as trimethylene glycol, tetramethylene glycol, neopentyl glycol, hydroquinone and the like as an ether component can also be used. In addition, in the case of polyether ester amide, dicarboxylic acids used as binders for hard segments and soft segments include aliphatic dicarboxylic acids such as succinic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid and decanedicarboxylic acid. Examples thereof include aromatic dicarboxylic acids such as acid, terephthalic acid, isophthalic acid and naphthalenedicarboxylic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid. The components constituting the hard segment, soft segment, and binder may be used alone or in combination of two or more. Examples of polyamide elastomers include nylon 12 as a hard segment, polytetramethylene oxide as a soft segment, and polyetheresteramide using a dicarboxylic acid component as a binder. The copolymerization ratio of the hard segment and the soft segment can be appropriately selected so as to match the required hardness.

  Examples of the polyester elastomer include polyether ester block copolymers obtained by copolymerizing thermoplastic polyester as a hard segment and poly (alkylene oxide) glycol as a soft segment. Examples of the component constituting the thermoplastic polyester that is a hard segment include a copolymer obtained by using at least one dicarboxylic acid and at least one diol component. It is a terpolymer copolymerized with (alkylene oxide) glycol. Specific examples of the dicarboxylic acid constituting the hard segment include terephthalic acid, isophthalic acid, phthalic acid, naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4-dicarboxylic acid, Aromatic dicarboxylic acids such as phenoxyethanedicarboxylic acid and sodium 3-sulfoisophthalate, alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid, adipic acid, sebacic acid, dodecanediic acid, Examples thereof include at least one dicarboxylic acid selected from aliphatic dicarboxylic acids such as dimer acid and ester-forming derivatives thereof. Specific examples of the diol component constituting the hard segment include aliphatic groups such as 1,4-butanediol, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, neopentyl glycol, and decamethylene glycol. At least one diol component selected from diols, alicyclic diols such as 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane dimethanol, and ester-forming derivatives thereof. It is done. Specific examples of the poly (alkylene oxide) glycol constituting the soft segment include polyethylene glycol, poly (1,2- and 1,3-propylene oxide) glycol, poly (tetramethylene oxide) having an average molecular weight of about 400 to 5,000. And) at least one poly (alkylene oxide) glycol selected from glycol, a copolymer of ethylene oxide and propylene oxide, a copolymer of ethylene oxide and tetrahydrofuran, and the like.

  As the polyolefin elastomer, an elastomer that can be used as an elastomer can be selected from random copolymers and block copolymers obtained using an olefin monomer. The olefin monomer in this case includes a case where it is a conjugated diene compound.

  Specific examples of the polyolefin elastomer block copolymer include those obtained mainly using a hydrogenated diene copolymer. The hydrogenated diene copolymer includes a polymer block (c) in which a conjugated diene compound is mainly 1,4-bonded, and a polymer block in which a conjugated diene compound is mainly 1,2-bonded and / or 3,4-bonded. A hydrogenated diene copolymer obtained by using the combined block (d) and saturated with a part of a double bond derived from a conjugated diene moiety in the diene copolymer is preferable.

  The 1,4-bond content in the polymer block (c) is preferably 70% or more of the total bond content (1,2-, 3,4-, 1,4-bond). % Or more is more preferable. The content of the polymer block (c) is preferably 1 to 99% by weight, more preferably 5 to 65% by weight, and most preferably 5 to 50% by weight based on the entire hydrogenated diene copolymer. Further, the content of 1,2-bond and / or 3,4-bond in the polymer block (d) constituting the hydrogenated diene copolymer is the total bond content (1,2-, 3,4-, 1,4-bond) is preferably 50% or more, more preferably 60 to 95%. The contents of 1,4-bond, 1,2-bond, and 3,4-bond are measured by Morero method using infrared spectroscopy, and the measurement method and measurement conditions are, for example, written by Shinichi Nishida and Noriyoshi Iwamoto "Material analysis by infrared method" (published by Kodansha, 1986), pages 215 to 217. The content of the polymer block (d) in the hydrogenated diene copolymer is preferably 10 to 95% by weight, more preferably 20 to 90% by weight, and most preferably 50 to 90% by weight.

  Examples of the conjugated diene compound of the hydrogenated diene copolymer include 1,3-butadiene, isoprene, 2,3 dimethyl-1,3-butadiene, 1,3-pentadiene, 2-methyl-1,3-pentadiene, 1, Examples include 3-hexadiene, 4,5-diethyl-1,3-octadiene, 3-butyl-1,3-octadiene, chloroprene, and the like, but hydrogenated diene copolymer having industrial properties and excellent physical properties. In order to obtain a coalescence, it is preferable to use 1,3-butadiene, isoprene, or 1,3-pentadiene as the conjugated diene compound. The hydrogenated diene copolymer is a polymer mainly comprising a polybutadiene block having a 1,2-bond content of 25% by weight or less and a conjugated diene compound as a polymer block (c), A block copolymer obtained using a polymer block (d) having a 1,2-bond content and a 3,4-bond content of 50% by weight or more of a conjugated diene moiety constituting the diene copolymer, For example, (c)-(d) block copolymer, (c)-(d)-(c) block copolymer, or the block copolymer unit is extended or branched via a coupling agent residue. Hydrogenation was performed on at least one block copolymer selected from the group obtained using the block copolymer, and the double bond derived from the conjugated diene moiety was saturated by 70% or more, and the number average molecular weight was 40,000. ~ 7 Even the hydrogenated diene copolymer is 0000 preferred. Among these, a fiber produced using an olefin crystal-ethylene butylene-olefin crystal block copolymer called CEBC is particularly preferable because it is excellent in elasticity. Specific examples of CEBC include JSR DYNARON (trade name, manufactured by JSR Corporation). The CEBC may be obtained by using a phenoxyimine complex catalyst.

  In the present invention, the polymer block (d) of the hydrogenated diene copolymer is a copolymer of an aromatic vinyl compound containing 70% by weight or more of a conjugated diene compound and a conjugated diene compound, and a conjugated diene compound portion. The vinyl bond content is 25 to 70%, and the block structure is (c)-(dc) n or (cd) m (where n is 1 or more and m is an integer of 2 or more) A hydrogenated diene copolymer which is a linear or branched block copolymer represented by The vinyl bond content is also measured by the Morero method using infrared spectroscopy as well as the 1,4-bond, 1,2-bond and 3,4-bond contents. Examples of the aromatic vinyl compound include styrene, α-methylstyrene, p-methylstyrene, t-butylstyrene, divinylbenzene, N, N-dimethyl-p-aminoethylstyrene, N, N-diethyl-p-. Examples thereof include aminoethyl styrene and vinyl pyridine, and styrene and α-methyl styrene are particularly preferable.

The random copolymer of the polyolefin elastomer is a hydrocarbon having a double bond, a monomer such as ethylene, propylene, and butene represented by C _n H _2n (n is an integer of 2 or more), and at least one other than these. It is a copolymer with other monomers of the seed, and in particular, a random copolymer in which the monomers are randomly arranged. In the present invention, a random copolymer having a density in the range of 0.850 to 0.920 g / cm ³ is preferable. The density affects the elasticity, and the random copolymer having the density within the above range can obtain a sufficient elasticity.

  The random copolymer is a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms or α-olefin having 2 to 20 excluding propylene and 3 carbon atoms from the viewpoint of texture and elasticity after fiber processing. A copolymer with olefin is preferred. Furthermore, a copolymer obtained using ethylene and an α-olefin having 3 to 10 carbon atoms is preferable. For example, propylene, 1-butene, 3-methyl-1-butene, 4-methyl-1-butene, 1- Examples thereof include copolymers with pentene, 1-hexene, 4-methyl-1-pentene, 1-heptene, 1-octene, 1-nonene, 1-decene and the like. Among the α-olefins, 1-butene, 1-pentene, 1-hexene and 1-octene are particularly preferable. These α-olefins can be used singly or in combination of two or more. An ethylene-α-olefin copolymer such as an ethylene-octene copolymer or an ethylene-butene copolymer in combination of these is preferred. Further, molecular weight distribution (Mw / Mn) of a copolymer of ethylene and an α-olefin having 3 to 20 carbon atoms or a copolymer of propylene and an α-olefin having 2 to 20 carbon atoms excluding 3 carbon atoms used in the present invention. Is preferably 1.5 to 4 from the viewpoint of spinnability.

However, the random copolymer is an ethylene-α-olefin copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and has a molecular weight distribution determined by gel permeation chromatography (GPC) (Mw / Mn) is 3.5 or less, and the ethylene-α-olefin copolymer satisfies the following requirements a) to c) and is substantially linear, and has 3 to 20 carbon atoms. An ethylene-α-olefin copolymer in which at least one α-olefin is uniformly branched is excluded.
a) Density is 0.90 g / cm ³ or less b) The ratio of melt mass flow rate is I ₁₀ / I ₂ is 6 or more.
c) The ratio (I ₁₀ / I ₂ ) between the molecular weight distribution (Mw / Mn) and the melt mass flow rate is in the relationship of the following formula.
4.63 ≦ (I ₁₀ / I ₂ ) − (Mw / Mn)
Here, I ₁₀ is a melt mass flow rate (ASTM D1238) measured at a temperature of 190 ° C. and a load of 10 kg weight (98.07 N), and I ₂ is a temperature of 190 ° C. and a load of 2.16 kg weight (21 .18N) melt mass flow rate (ASTM D1238).

  Specific examples of products of random copolymers of olefin elastomer that can be used in the present invention include Engage (trade name, manufactured by DuPont Dow Elastomer Japan Co., Ltd.), Tuffmer (trade name, manufactured by Mitsui Chemicals, Inc.). Can be mentioned. The polyolefin copolymer used in the present invention may be a copolymer produced by a metallocene catalyst. In addition, the terpolymer which added the diene monomer for bridge | crosslinking to (alpha) -olefin is also contained, Specifically, ethylene-propylene-diene rubber and ethylene-butene-diene rubber are illustrated.

As the polyolefin elastomer, elastomeric polypropylene and propylene-ethylene block copolymer can be preferably used.
Elastomeric polypropylene has a stereoblock structure obtained by using isotactic polypropylene or syndiotactic polypropylene with a crystalline polymer chain and amorphous atactic polypropylene, and is isotactic polypropylene or syndiotactic. It is a structure obtained by copolymerizing polypropylene as a hard segment and atactic polypropylene as a soft segment. In the present invention, for example, elastomeric polypropylene described in US Pat. Nos. 4,335,225, 4,522,982, and 5,188,768 can be used. These mean both homopolymers and copolymers. In addition to propylene units, the copolymer may contain other olefin units other than propylene units, such as ethylene, butylene, pentene or hexene units, in the molecule. These have a substantially stereoregular block sequence in the chain structure and are obtained, for example, using isotactic polypropylene and atactic polypropylene ordered blocks selectively arranged in the polymer chain.

  A propylene-ethylene block copolymer is a polypropylene segment, as shown in WO 00/23489, rather than in the presence of a blend of polypropylene and poly (ethylene-co-propylene). Is a true block copolymer in which poly (ethylene-co-propylene) is chemically bonded. Specifically, in the presence of an olefin polymerization catalyst obtained using a solid catalyst component composed of titanium and halogen or titanium, magnesium and halogen and an organometallic compound such as triethylaluminum, an electron donating compound is added as necessary. Using a polymerization reactor, preferably a tubular polymerization reactor as exemplified in JP-A-9-87343, preferably in the polymerization zone (i) in a short time by a liquid phase method. Immediately after synthesizing a predetermined amount of the polypropylene segment, a predetermined amount of poly (ethylene-co-propylene) segment is synthesized in the polymerization region (ii) in the downstream in a short time, whereby the polypropylene segment and the poly (ethylene- Polypropylene-b-poly (ethylene-co-propylene) in which co-propylene) segments are chemically bonded (covalently bonded) Propylene containing pyrene) - ethylene block copolymer can be produced. The propylene-ethylene block copolymer thus obtained has a weight average molecular weight (Mw) of 100,000 or more and a poly (ethylene-co-propylene) segment content of less than 5 to 100% by weight, The total ethylene content is 2 to 95% by weight.

  The “fiber obtained using the second component resin” of the present invention may contain a resin component other than the second component as long as the effects of the present invention are not impaired.

  In the resin component used in the present invention, additional additives may be blended as necessary within a range not impairing the effects of the present invention. Examples of additives include UV absorbers, thickening branching agents (herein, thickening branching agents increase the viscosity of non-adhesive components but do not impart tackiness), matting agents, colorants, and softeners. Imparting agent, anti-aging agent, heat stabilizer, weathering agent, metal deactivator, light stabilizer, copper damage inhibitor, antibacterial / antifungal agent, dispersant, softener, plasticizer, crystal nucleating agent, difficult Examples include flame retardants, foaming agents, foaming aids, titanium oxide, mica, calcium carbonate, talc, silica, calcium silicate, hydrotalcite, kaolin, polyolefin wax, cellulose powder, and low molecular weight polymers. In addition, it is preferable that the additive which gives adhesiveness is not added to 1st component resin.

  In particular, in applications used outdoors, any of conventionally used ultraviolet absorbers can be used, such as 2-hydroxy-4-methoxy-benzophenone, 2-hydroxy-4-n-octoxy-benzophenone, Benzophenone ultraviolet absorbers such as 4-dodecyloxy-2-hydroxy-benzophenone, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′) Benzotriazole ultraviolet absorbers such as -t-butyl-5'-methylphenyl) benzotriazole, salicylic acid ester ultraviolet absorbers such as p-octylphenyl salicylate and dodecyl salicylate, 2-ethylhexyl-2-cyano -3,3-diphenyl acrylate and the like.

  The stretchable nonwoven fabric of the present invention is a nonwoven fabric obtained by using a mixed fiber web composed of fibers obtained using a first component resin and fibers obtained using a second component resin. In the stretchable nonwoven fabric of the present invention, if the mixing ratio of the fibers obtained using the first component resin is too small, the resulting nonwoven fabric has insufficient flexibility and stretchability at low stress. The anti-blocking property of the nonwoven fabric to be produced is lowered, and when the nonwoven fabrics of the present invention are overlapped, it becomes easy to adhere and the stress retention property is lowered. From these viewpoints, the preferred blend (weight) ratio of the fiber obtained using the first component resin and the fiber obtained using the second component resin is 5:95 to 95: 5, more preferably 10 : 90 to 90:10, particularly preferably 20:80 to 80:20. In addition, by using the fiber obtained by using the first component resin and the fiber obtained by using the second component resin as the mixed fiber as in the present invention, the compatibility between the components is low and the elastomers that cannot be spun by resin mixing are used. Even if it exists, it can be spun easily and it can be set as a stretchable nonwoven fabric.

  The method for producing the fibers constituting the stretchable nonwoven fabric of the present invention is not particularly limited, and is a method for obtaining short fibers such as staple fibers and chops, and long fibers such as a melt blow method, a spun bond method, and a tow opening method. However, the melt blow method is preferable from the viewpoint of texture, and the spun bond method is preferable from the viewpoint of strength.

  In the stretchable nonwoven fabric of the present invention, fibers obtained using the second component resin are mixed with fibers obtained using the first component resin in order to impart antiblocking properties to the stretchable nonwoven fabric. There is no particular limitation on the method of mixing the fiber obtained using the second component resin with the fiber obtained using the first component resin, and conventionally known and publicly available methods can be used.

  For example, each staple fiber obtained by using a first component resin and a second component resin that have been subjected to crimping treatment as necessary after spinning and drawing and cut into a predetermined length is produced by the card method or air When forming a web by the raid method, both fibers can be mixed. In addition, when the fiber obtained by using one component is directly made into a non-woven fabric by the melt-blowing method or the spunbond method, the other short fiber is used when spraying the fiber on the collecting conveyor. A method of supplying and mixing long fibers and the like is exemplified. Moreover, when forming the web of a short fiber or a long fiber, you may spray the long fiber manufactured by either the melt blow method or the spun bond method.

  When the two-component fibers constituting the stretchable nonwoven fabric of the present invention are based on the melt blow method, for example, a structure in which spinning holes from which different kinds of resins flow out are alternately arranged in a row in one spinneret described in Japanese Patent No. 3360377 The spinneret can be used. In the obtained web, fibers obtained using the first component resin and fibers obtained using the second component resin are more uniformly mixed. Moreover, the spinneret for the first component resin and the spinneret for the second component resin are used in combination, and the fiber web obtained by using the first component resin obtained by each spinneret and the second component resin are used. The fiber web to be formed may be laminated. Furthermore, the laminate can be treated with a needle punch or the like to improve the fiber mixing state. In order to obtain a more uniformly mixed web, a method using a spinneret described in Japanese Patent No. 3360377 is preferable.

  The content of each fiber in the stretchable nonwoven fabric can be changed by changing the number of spinning holes assigned to the first component resin and the second component resin, or by changing the extrusion amount of each resin. Further, a mixture having different fineness can be obtained by spinning at different extrusion amounts per spinning hole of each resin or by spinning using a die having a different hole diameter.

  When the two-component fibers constituting the stretchable nonwoven fabric of the present invention are based on the spunbond method, for example, a spinneret having a structure in which spinning holes from which different types of resin flow into one spinneret shown in FIG. Can be used. In the obtained web, fibers obtained using the first component resin and fibers obtained using the second component resin are mixed more uniformly. Moreover, the spinneret for the first component resin and the spinneret for the second component resin are used in combination, and the fiber web obtained by using the first component resin obtained by each spinneret and the second component resin are used. The fiber web to be formed may be laminated. Further, the laminated product can be treated with a needle punch or the like to improve the fiber mixture state.

  The content of each fiber in the stretchable nonwoven fabric can be changed by changing the number of spinning holes assigned to the first component resin and the second component resin, or by changing the extrusion amount of each resin. Further, a mixture having different fineness can be obtained by spinning at different extrusion amounts per spinning hole of each resin or by spinning using a die having a different hole diameter.

  The components of the fibers constituting the stretchable nonwoven fabric of the present invention may include at least two components, ie, a first component resin and a second component resin, as essential components, and fibers obtained using different types of thermoplastic elastomer resins. It may be added or a non-thermoplastic elastomer fiber may be added as long as the performance of the present invention is not impaired.

  The cross-sectional shape of the fibers constituting the stretchable nonwoven fabric of the present invention may be an irregular cross section or a hollow cross section as long as the round cross section or the spinnability is not impaired. Although the average fiber diameter of a fiber is not specifically limited, 1-50 micrometers is a preferable range. Furthermore, it is preferably 1 to 30 μm from the surface of the texture.

  The stretchable nonwoven fabric of the present invention exhibits an elongation recovery rate of 70% or more at 100% elongation. More preferably, the elongation recovery rate is 80% or more, and even more preferably 90% or more. If the elongation recovery rate at 100% elongation is 70%, sufficient stretch performance can be imparted to the resulting product. For example, when used for the waist part of disposable pants-type diapers, even if the waist part using a stretchable nonwoven fabric is stretched when putting on the diaper, the waist part recovers sufficiently, so good tightening can be achieved, Diaper misalignment does not occur.

  The stretchable nonwoven fabric of the present invention is characterized by low peel strength exhibiting antiblocking properties. This is because fibers obtained using the first component resin having a relatively strong adhesive property and fibers obtained using a second component resin different from the first component resin are mixed. Therefore, when the weight ratio of the first component fiber (first component fiber / second component fiber) increases (the weight ratio of the second component fiber decreases), the antiblocking property decreases (peel strength increases). When the weight ratio of the component fibers is within the above-described appropriate range, the anti-blocking property is increased (peeling strength is decreased).

  Since the stretchable nonwoven fabric of the present invention mixes different types of fibers, the anti-blocking property is improved by reducing the adhesion due to the affinity between the same types of fibers generated when the same types of fibers are mixed.

  The anti-blocking property is more excellent as the strength (hereinafter referred to as peel strength) when peeling the two stretched nonwoven fabrics overlapped is smaller. Preferably it is 3.0 N / 25 mm or less, More preferably, it is 2.0 N / 25 mm or less, Most preferably, it is 1.5 N / 25 mm or less. Usually, the stretchable nonwoven fabric is stored in a state where it is wound on a roll, and when necessary, the stretchable nonwoven fabric is fed from the roll and processed into a product. At that time, the peel strength of the stretchable nonwoven fabric is possessed. Is small, the stretchable nonwoven fabric can be fed out with a tension within a range in which the stretchable nonwoven fabric does not cause plastic deformation, so that the operability and the quality of the obtained product can be kept good.

On the other hand, if the peel strength is large, a strong force is required to separate the stretchable nonwoven fabrics in contact with each other when the stretchable nonwoven fabric is fed from the roll. Arise. Even if it does not break, the stretchable nonwoven fabric stretches and cannot be processed thereafter.
Further, in the melt blow method and the spun bond method, which are direct nonwoven fabric forming methods, the nonwoven fabric is collected on the conveyor. At this time, if the anti-blocking property is strong, it is difficult to collect from the conveyor.

  In the stretchable nonwoven fabric of the present invention, the peel strength when peeling two nonwoven fabrics laminated under a condition of 50 ° C. × 24 hours at a load of 5 kg is preferably less than or equal to the strength at 50% elongation of the nonwoven fabric. By using one, operability and the quality of the product obtained can be kept good. In particular, stretchable nonwoven fabric rolls stored in the summer are likely to stick between fibers due to high temperature and high humidity and load, and the operability when extending the stretchable nonwoven fabric from the roll becomes extremely poor. By using a sheet having an exfoliation strength of 50% or less when the elastic nonwoven fabric is peeled off, a high-quality product can be obtained without causing the above problem.

Although the fabric weight of the elastic nonwoven fabric of this invention is not specifically limited, 5-300 g / m < ² >, Preferably it is 10-200 g / m < ² >, More preferably, it is 20-150 g / m < ² >. Moreover, you may heat-process according to the objective. As a heat treatment method, a known method such as a thermocompression bonding method using a heated embossing roll, an air-through method using heated air, or a method using an infrared lamp can be used. In addition, any one or more of sonic bond processing, water jet processing, needle punch processing, and resin bond processing may be performed.

In the present invention, the obtained stretchable nonwoven fabric can be used as a composite nonwoven fabric by laminating at least one article selected from nonwoven fabrics other than the stretchable nonwoven fabric, film, web, woven fabric, knitted fabric and tow. . The material used for lamination is not particularly limited, but various materials can be appropriately selected and used depending on the purpose.
For example, when imparting stretchability to the composite nonwoven fabric, it is preferable that the composite nonwoven fabric obtained so as not to inhibit the stretch of the stretchable nonwoven fabric can be stretched by 20% or more. For example, a non-woven fabric, a net, or a film formed by a melt blow method using a thermoplastic elastomer resin such as a polystyrene elastomer, a polyolefin elastomer, a polyester elastomer, or a polyurethane elastomer. Further, there may be mentioned knitted fabrics and woven fabrics which are made into fibers using thermoplastic elastomer resins such as polystyrene elastomers, polyolefin elastomers, polyester elastomers and polyurethane elastomers. In addition, webs, non-woven fabrics, woven fabrics, and knitted fabrics that are structurally stretchable by crimping or the like instead of elastomer materials are also included. Furthermore, although what laminated | stacked the web obtained by the card | curd method or the air raid method by the water jet method, the point bond method, and the through air method is mentioned, It is not limited to these.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited to these Examples. The measurement results in the following examples and comparative examples were in accordance with the following method.

(1) Elongation recovery rate at 100% elongation Using a nonwoven fabric test piece having a width of 25 mm and a length of 200 mm, the nonwoven fabric is made 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 film was stretched to 100% at a tensile speed of 300 mm / min, then returned at the same speed, and the load applied to the stretchable nonwoven fabric was set to zero. Immediately thereafter, the film was stretched to 100% 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 100% elongation (%) = {(100 ^{* 1} −L) / 100 ^{* 1} } × 100
^{* 1} : Initial length of test piece between chucks (mm)

(2) Strength at 50% elongation
A nonwoven fabric test piece having a width of 25 mm and a length of 200 mm is prepared 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 strength when stretched to 50% elongation at a tensile speed of 300 mm / min (N / 25 mm) was defined as the strength at 50% elongation.

(3) Feeling A nonwoven fabric having a length of 100 mm and a width of 100 mm is prepared. 10 panelists touch the non-woven fabric and judge the texture. Ten panelists made a 10-point evaluation, and evaluated the total score of all members. Therefore, the total score was from a minimum of 0 points to a maximum of 100 points, and a score of 70 points or more was judged to be good.

(4) Peel strength Two non-woven fabric test pieces having a length of 100 mm and a width of 100 mm are prepared. The test pieces are placed on top of each other and an aluminum plate having a length of 100 mm and a width of 100 mm is placed thereon. A weight is placed on the aluminum plate, the weight is adjusted to a total of 5 kg, and left in an oven at 50 ° C. for 24 hours. After leaving, the test piece taken out in a room at 25 ° C./RH 65% is cut into a width of 25 mm, and the nonwoven fabrics are peeled off by hand from one end in the longitudinal direction to a length of 50 mm. Using Autograph AG-G (trade name, manufactured by Shimadzu Corporation), both ends of the peeled nonwoven fabric were fixed to upper and lower chucks set to 50 mm between chucks, respectively. The nonwoven fabric was pulled at a pulling speed of 100 mm / min until the nonwoven fabrics were completely peeled, and the average value of strength was defined as the value of peel strength (N / 25 mm) (N = 5). The smaller the peel strength, the better the anti-blocking property.

(5) Flexibility Based on JIS1096 (cantilever method), the bending resistance was measured for each of the MD direction and the CD direction of the nonwoven fabric, and the total was determined as the flexibility. In addition, it showed that a nonwoven fabric was so soft that the value of a softness | flexibility was small, and the softness | flexibility 70 mm or less was judged to be the softness | flexibility favorable in this invention.

Abbreviations and contents of materials used in the present invention are as follows.
First component resin 1-i: (styrene)-(ethylene-butylene)-(styrene) block copolymer (SEBS), Tuftec H 1031 ((trade name), manufactured by Asahi Kasei Chemicals Corporation).
1-ii: (styrene)-(ethylene-butylene)-(styrene) block copolymer (SEBS), KRATON G 1657 ((trade name), manufactured by Kraton Polymer Japan Co., Ltd.).
1-iii: Hydrogenated styrene-diene copolymer (HSBR), DYNARON 2324P ((trade name), manufactured by JSR Corporation).

Second component resin 2-i: Thermoplastic polyurethane polymer, Pandex T-1190 ((trade name), manufactured by DIC-Bayer).
2-ii: Polyamide elastomer, Pebax 2533 ((trade name), manufactured by Atofina Japan Co., Ltd.).
2-iii: Polyester elastomer, Glease E-200LV ((trade name), manufactured by Dainippon Ink & Chemicals, Inc.).
2-iv: ethylene-α-olefin copolymer, MI = 70 g / 10 min (190 ° C., 2.16 kg), density = 0.893 g / cm ³ , I ₁₀ / I ₂ = 5.7, Mw / Mn = 1.9.
2-v: Olefin crystal-ethylene butylene-olefin crystal block copolymer, DYNARON 6200P ((trade name), manufactured by JSR Corporation).
2-vi: polypropylene, MFR = 16 g / 10 min (230 ° C., 2.16 kg), density = 0.905 g / cm ³
2-vii: high-density polyethylene, MI = 30 g / 10 min (190 ° C., 2.16 kg), density = 0.942 g / cm ³

Example 1
1-i was used as the first component resin, and 2-i was used as the second component resin as a raw material resin for the stretchable nonwoven fabric. Two extruders with screw (30 mm diameter), heating element, and gear pump, spinneret for blending fibers (hole diameter: 0.3 mm, different component fibers arranged alternately in a row, number of holes: 501 holes, effective width: 500 mm) A melt blown nonwoven fabric was produced using an apparatus comprising a compressed air generator and an air heater, a collection conveyor equipped with a polyester net, and a winder. The first component resin and the second component resin are respectively charged into the respective extruders, the first component resin is heated and melted at 220 ° C. and the second component resin is heated at 230 ° C. with a heating element, and the gear pump is replaced with the first component resin The weight ratio of the second component fat was set to be 40:60, and the molten resin was discharged from the spinneret at 1-i of 0.115 g / min and 2-i of 0.171 g / min per single hole. The discharged fibers were sprayed onto a polyester net collection conveyor running at a running speed of 1.4 m / min with compressed air of 98 kPa (gauge pressure) heated to 400 ° 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 up into a roll by a winder to obtain a stretchable nonwoven fabric having a basis weight of 98 g / m ² . The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), anti-blocking property (peel strength) and texture, and also in flexibility (flexibility). Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

  The elastic nonwoven fabric obtained in Example 1 was stripped of the elastic elastic material on both sides of the waist part of the “PAMPERS Sukuku Pants” made by Procter & Gamble Far East Inc., a pants-type disposable diaper. , 5 pants-type disposable diapers with the stretchable nonwoven fabric attached were prepared and used for 5 infants, but the disposable diapers were not displaced or removed due to insufficient tightening, and no excrement leaked. . Moreover, even after the attachment / detachment operation was performed five times, the disposable diaper was not displaced or removed.

A stretchable nonwoven fabric having a basis weight of 100 g / m ^{2 made} of three-dimensional crimped polyolefin staple fiber was laminated with the stretchable nonwoven fabric of Example 1 and entangled with a water jet to prepare a laminated nonwoven fabric. Five supporters were made from the laminated nonwoven fabric obtained and wound around the knees of five monitors for 24 hours, but there was no shift or removal of the supporters due to insufficient tightening.

Example 2
The same raw material resin as in Example 1 was used, the gear pump was set so that the weight ratio of the first component resin: second component resin was 20:80, and 0.01 g of 1-i per single hole from the spinneret. / Min, a stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at 0.243 g / min and the conveyor speed was 1.5 m / min. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was also excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

  Ten adhesive bandages were prepared by applying an adhesive to one side of the stretchable nonwoven fabric obtained in Example 2 and applying a hemostatic agent-applied cloth (for bandage bandages), and wound on the index fingers of 10 monitors for 24 hours. However, because it was sufficiently stretchable, it was able to follow the movement of the fingers on the monitor, and there was no displacement or peeling of the adhesive bandage.

  The tape which apply | coated the adhesive material to the single side | surface of the elastic nonwoven fabric obtained in Example 2 was prepared. 10 surgical tapes to be applied to the wounds were wound around the elbows of 10 monitors for 24 hours. However, due to sufficient elasticity, the movement of the monitor's elbows was followed, and there was no displacement or peeling of the tape.

  Ten pieces of wrapping material prepared by applying painkillers to the stretchable nonwoven fabric obtained in Example 2 were prepared and pasted on the knees of 10 monitors for 24 hours. Following the movement, there was no gap or peeling of the poultice.

Example 3
The same raw material resin as in Example 1 was used, the gear pump was set so that the weight ratio of the first component resin: second component resin was 80:20, and 1-i per single hole from the spinneret was 0.202 g / A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten raw material resin was discharged at 0.050 g / min and 2-i was discharged, and the conveyor speed was 1.3 m / min. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was also excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 4
Using the same raw material resin as in Example 1, the gear pump was set so that the weight ratio of the first component resin to the second component resin was 95: 5, and 1-i was 0.229 g / single hole from the spinneret. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of 0.013 g / min, and the conveyor speed was 1.2 m / min. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 5
The same raw material resin as in Example 1 was used, the gear pump was set so that the weight ratio of the first component resin: second component resin was 5:95, and 1-i was 0.016 g / single hole from the spinneret. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of 0.307 g / min and the conveyor speed was 1.6 m / min. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 6
1-i as the first component resin, 2-ii as the second component resin as the raw material resin for the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin to the second component resin is 40:60. Except that the molten resin was discharged from the spinneret at a rate of 1-i of 0.104 g / min and 2-ii of 0.152 g / min per single hole, and the conveyor speed was 1.3 m / min. A stretchable nonwoven fabric was produced in the same manner. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 7
1-i as the first component resin, 2-iii as the second component resin as the raw material resin of the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Except that the molten resin was discharged from the spinneret at 0.110 g / min and 2-iii at 0.161 g / min per single hole, and the conveyor speed was 1.4 m / min. A stretchable nonwoven fabric was produced in the same manner. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 8
1-i as the first component resin, 2-iv as the second component resin as the raw material resin for the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin to the second component resin is 40:60. Example 1 except that the melt resin was discharged from the spinneret at a rate of 1-i of 0.092 g / min and 2-iv of 0.137 g / min per single hole, and the conveyor speed was 1.1 m / min. A stretchable nonwoven fabric was produced in the same manner. The measurement results of the physical properties of the obtained stretchable nonwoven fabric are shown in Table 1. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 9
1-i as the first component resin, 2-iv as the second component resin as the raw material resin for the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin to the second component resin is 40:60. Example 1 except that the melt resin was discharged from the spinneret at a rate of 1-i of 0.092 g / min and 2-iv of 0.137 g / min per single hole, and the conveyor speed was 1.1 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 10
The first component resin is 1-ii, the second component resin is 2-i as a raw material resin for stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Example 1 except that the molten resin was discharged from the spinneret at 0.115 g / min for 2-ii and 0.164 g / min for 2-i per single hole, and the conveyor speed was 1.4 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 11
1-ii as the first component resin, 2-ii as the second component resin as the raw material resin for the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Example 1 except that the molten resin was discharged from the spinneret at a rate of 0.102 g / min for 2-ii and 0.147 g / min for 2-ii per single hole, and the conveyor speed was 1.2 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 12
The first component resin is 1-ii, the second component resin is 2-iii as the raw material resin for the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Except that the melted resin was discharged from the spinneret at 0.106 g / min for 2-ii and 0.157 g / min for 2-iii per single hole, and the conveyor speed was 1.3 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 13
The first component resin is 1-ii, the second component resin is 2-iv, and the raw material resin of the stretchable nonwoven fabric. The gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Example 1 except that the molten resin was discharged from the spinneret at 1-ii of 0.090 g / min and 2-iv of 0.134 g / min per single hole, and the conveyor speed was 1.1 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 14
1-iii as the first component resin, 2-i as the second component resin as the raw material resin of the stretchable nonwoven fabric, and the gear pump is set so that the weight ratio of the first component resin: second component resin is 40:60. Example 1 except that the molten resin was discharged from the spinneret at 0.111 g / min for 1-iii and 0.167 g / min for 2-i per single hole, and the conveyor speed was 1.4 m / min. A stretchable nonwoven fabric was produced in the same manner. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Example 15
1-i was used as the first component resin, and 2-i was used as the second component resin as a raw material resin for the stretchable nonwoven fabric. Two extruders having a screw (40 mm diameter), a heating element, and a gear pump, a spinneret for blending fibers (hole diameter 0.4 mm, 120 holes) having the spinning hole arrangement shown in FIG. 1, air soccer, charging method opening machine The spunbonded nonwoven fabric was produced using an apparatus comprising a collection conveyor equipped with a polyester net, a point bond processing machine and a winder. The first component resin and the second component resin are respectively added to each extruder, the first component resin is heated and melted at 220 ° C. and the second component resin is heated and melted at 230 ° C. by a heating body, and the gear pump is replaced with the first component resin The weight ratio of the second component resin was set to be 40:60, and the molten resin was fed from the spinneret at a spinning speed of 1-i of 0.480 g / min and 2-i of 0.715 g / min per single hole. The discharged fibers were introduced into an air soccer ball, and immediately after opening with a charging method spreader, the fibers were collected on a collecting conveyor. The air soccer air pressure was 196 kPa. The web on the collecting conveyor is put into a point bond processing machine (crimp area ratio 15%) heated to an upper and lower roll temperature of 90 ° C., and the processed non-woven fabric is wound into a roll with a winder, and the basis weight is 30 g / m. ² stretchable nonwoven fabric was obtained. Table 2 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was excellent in stretchability (elongation recovery rate at 100%), antiblocking property (peeling strength) and texture, and was excellent in flexibility. Moreover, even when the roll of the stretchable nonwoven fabric was fed out, it could be fed out without any problem (peeling strength ≦ 50% strength at elongation).

Comparative Example 1
Only the first component resin 1-i is used as the raw material resin, the first component resin is introduced into each of the two extruders, heated and melted at 220 ° C. by the superheater, and the gear pumps are each 0.120 g. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of / min and the conveyor speed was 1.2 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The resulting stretchable nonwoven fabric is composed only of the first component resin, so it has excellent flexibility, but has poor antiblocking property (peel strength) and poor texture, and does not show satisfactory performance. .

Comparative Example 2
Only the second component resin 2-i is used as the raw material resin, the second component resin is charged into each of the two extruders, heated and melted at 230 ° C. by the superheater, and 0.164 g each of the gear pumps. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of / min and the conveyor speed was 1.7 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. Since the obtained stretchable nonwoven fabric is composed of only the second component resin, the antiblocking property (peeling strength) was good, but the flexibility was poor, the texture was poor, and satisfactory performance was exhibited. There wasn't.

Comparative Example 3
Using the same raw material resin as in Example 1, the gear pump was set so that the weight ratio of the first component resin: second component resin was 1:99, and 1-ii per single hole from the spinneret was 0.003 g / A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of 0.324 g / min, and the conveyor speed was 1.6 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The resulting stretchable nonwoven fabric had good antiblocking properties (peel strength), but due to the extremely small amount of the first component resin, the flexibility was poor and the texture was poor and did not show satisfactory performance. .

Comparative Example 4
Using the same raw material resin as in Example 1, the gear pump was set so that the weight ratio of the first component resin: second component resin was 99: 1, and 1-ii was 0.283 g / single hole from the spinneret. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten resin was discharged at a rate of 0.002 g / min for 2-min and 2-i, and the conveyor speed was 1.2 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The resulting stretchable nonwoven fabric is excellent in flexibility because of the extremely small amount of the second component resin, but has poor antiblocking property (peel strength) and poor texture, and does not exhibit satisfactory performance.

Comparative Example 5
The same raw material resin as in Example 1 was used, and 1-i and 2-i were mixed in advance (resin blend) so that 1-i: 2-i = 40: 60 (weight ratio) before feeding into the extruder. In the same manner as in Example 1 except that the molten raw material resin is discharged at a rate of 0.142 g / min per single hole, the conveyor speed is 1.4 m / min, and each is heated and melted at 230 ° C. with a superheater. The elastic nonwoven fabric was manufactured by the method. However, since the first component resin 1-ii and the second component resin 2-v are not compatible with each other, shots frequently occur and the nonwoven fabric cannot be formed.

Comparative Example 6
1-i was used as the first component resin, and 2-iv was used as the second component resin as a raw material resin for the stretchable nonwoven fabric. 1-i and 2-iv are premixed (resin blend) so that 1-i: 2-iv = 40: 60 (weight ratio) before feeding into the extruder, and 0.116 g / min per single hole. A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the molten raw material resin was discharged, the conveyor speed was 1.2 m / min, and each was heated and melted at 220 ° C. with a superheater. The resulting stretchable nonwoven fabric has good compatibility between the first component resin and the second component resin, so the anti-blocking property is poor. Deformation and tearing occurred.

Comparative Example 7
Only the first component resin 1-i is used as the raw material resin, the first component resin is put into each of the two extruders, heated and melted at 220 ° C. by a superheater, and the gear pumps are each 0.500 g. A stretchable nonwoven fabric was produced in the same manner as in Example 15 except that the molten resin was discharged at a rate of / min and the conveyor speed was 2.4 m / min. However, the first component resin alone has a strong adhesive force and the fiber cannot pass through the air soccer ball, so that a nonwoven fabric cannot be obtained.

Comparative Example 8
Using 1-i as the first component resin and 2-vi as the second component resin as the raw material resin for the stretchable nonwoven fabric, the second component resin is heated and melted at 270 ° C., and the gear pump is used as the first component resin: second component resin. The weight ratio is set to 70:30, and the molten resin is discharged from the spinneret at 1-i of 0.165 g / min and 2-vi of 0.070 g / min per single hole, and the conveyor speed is 1 A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the rate was 0.2 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. Since the obtained stretchable nonwoven fabric was a polypropylene in which 1-vi of the second component resin was non-stretchable, the stretch recovery rate at 100% stretch was low, and satisfactory performance was not exhibited.

Comparative Example 9
Using 1-i as the first component resin and 2-vii as the second component resin as the raw material resin for the stretchable nonwoven fabric, the second component resin is heated and melted at 240 ° C., and the gear pump is used as the first component resin: second component resin. The weight ratio is set to be 70:30, and the molten resin is discharged from the spinneret at 1-i of 0.165 g / min and 2-vii of 0.070 g / min per single hole, and the conveyor speed is 1 A stretchable nonwoven fabric was produced in the same manner as in Example 1 except that the rate was 0.2 m / min. Table 3 shows the measurement results of the physical properties of the resulting stretchable nonwoven fabric. The obtained stretchable nonwoven fabric was a high-density polyethylene in which 1-vii of the second component resin was non-stretchable, so the elongation recovery rate at 100 hours was low, and satisfactory performance was not exhibited.

  Examples of textile products using the stretchable nonwoven fabric or stretchable composite nonwoven fabric of the present invention include sanitary items such as disposable diaper stretchable members, diaper stretchable members, sanitary article stretchable members, and diaper cover stretchable members. In addition to elastic materials, elastic tapes, adhesive bandages, elastic materials for clothes, etc., clothing interlining, clothing insulation and insulation, protective clothing, hats, masks, gloves, supporters, elastic bandages, Various fabrics such as base materials for poultice materials, base materials for plaster materials, anti-skid base fabrics, vibration absorbers, finger sack, air filters for clean rooms, blood filters, oil / water separation filters, electret filters and separators with electret processing Thermal insulation materials, coffee bags, food packaging materials, automotive ceiling skin materials, soundproof materials, base materials, cushion materials, speaker dustproof materials, air Cleaner materials, insulator skins, backing materials, adhesive nonwoven fabric sheets, various automotive parts such as door trims, various cleaning materials such as copier cleaning materials, carpet surface materials and backing materials, agricultural distribution materials, wood drain materials, sports shoes Examples include, but are not limited to, members for shoes such as skins, members for bags, industrial sealing materials, wiping materials, sheets, and the like.

The figure which shows an example of the spinning hole arrangement | sequence of a spinneret in the case of manufacturing the mixed long-fiber nonwoven fabric of this invention by a spunbond method. ○ represents the spinning hole of the first component resin, and ● represents the spinning hole of the second component resin.

Claims (7)

Stretchability obtained by using a mixed fiber web in which the fiber (weight) ratio of fibers obtained using the first component resin and fibers obtained using the second component resin is in the range of 20:80 to 95: 5. Non-woven fabric, the first component resin is a polystyrene elastomer, and the polystyrene elastomer uses (1) at least one polymer block (a) obtained mainly using an aromatic vinyl compound, mainly using a conjugated diene compound. A block copolymer having at least one polymer block (b) obtained in this way and having some of the double bonds derived from the conjugated diene moiety hydrogenated, or (2) two derived from the conjugated diene moiety. A random copolymer of an aromatic vinyl compound and a conjugated diene compound in which a part of a heavy bond is hydrogenated, and the second component resin is a heat other than a polystyrene elastomer. Stretchable nonwoven fabric Ri thermoplastic elastomer der, elongation recovery rate at 100% elongation, characterized in that 70% or more.
However, the second component resin is an ethylene-α-olefin copolymer composed of ethylene and an α-olefin having 3 to 20 carbon atoms, and the molecular weight distribution (Mw / Mn) determined by gel permeation chromatography (GPC). Is 3.5 or less, and the ethylene-α-olefin copolymer satisfies the following a) to c) and is substantially linear, and at least of the α-olefin having 3 to 20 carbon atoms: Except when one type is an ethylene-α-olefin copolymer that is uniformly branched.
a) Density is 0.90 g / cm ³ or less b) Melt mass flow rate ratio (I ₁₀ / I ₂ ) is 6 or more.
c) The ratio (I ₁₀ / I ₂ ) between the molecular weight distribution (Mw / Mn) and the melt mass flow rate is in the relationship of the following formula.
4.63 ≦ (I ₁₀ / I ₂ ) − (Mw / Mn)   The stretchable nonwoven fabric according to claim 1, wherein the thermoplastic elastomer of the second component resin is at least one selected from the group consisting of polyurethane elastomers, polyamide elastomers, polyester elastomers, and polyolefin elastomers.   The stretchable nonwoven fabric according to claim 1 or 2, wherein the stretchable nonwoven fabric is a long-fiber nonwoven fabric obtained by a spunbond method.   The stretchable nonwoven fabric according to claim 1 or 2, wherein the stretchable nonwoven fabric is a long-fiber nonwoven fabric obtained by a melt blow method.   The stretchable nonwoven fabric according to any one of claims 1 to 4, wherein a peel strength when the stretchable nonwoven fabrics are overlapped with each other is equal to or less than a strength at 50% elongation of the nonwoven fabric.   A composite nonwoven fabric obtained by laminating at least one article selected from nonwoven fabric other than the stretchable nonwoven fabric, film, web, woven fabric, knitted fabric, and tow on the stretchable nonwoven fabric according to any one of claims 1 to 5.   A fiber product using the stretchable nonwoven fabric according to any one of claims 1 to 5, or the composite nonwoven fabric according to claim 6.

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