JP2006299425A - Water-absorbing nonwoven fabric laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water-absorbing nonwoven fabric laminate retaining excellent water absorption properties and moisture-absorbing and releasing properties and having high strength. <P>SOLUTION: The water-absorbing nonwoven fabric laminate is formed of a water-absorbing nonwoven fabric layer composed of a water-absorbing fiber containing thermoplastic water-absorbing resin, in which a polyalkylene glycol is copolymerized, in a range of 1-100 wt.% and a nonwoven fabric layer composed of a thermoplastic resin, and the laminate contains the water-absorbing fiber in an amount of 1-99 wt.% based on total weight of the laminate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a water-absorbent nonwoven fabric laminate having high water absorption and water retention without impairing high strength in a thermoplastic synthetic fiber nonwoven fabric.

  Conventionally, non-woven fabrics made of general-purpose thermoplastic synthetic fibers such as polyamide, polyester, and polypropylene are known as sanitary materials, general life-related materials or agricultural materials, and industrial materials. Generally, it is hydrophobic and has poor water absorption and water retention. Various proposals have been made so far to impart water absorbency to nonwoven fabrics made of these synthetic fibers.

  Specifically, a method of covering the surface of a synthetic fiber with a hydrophilic substance (for example, Patent Document 1), a method of attaching an alkyl phosphate metal salt (for example, Patent Document 2), a method of changing the surface or cross-sectional shape of the fiber (For example, Patent Document 3), a method for imparting porosity to a fiber (for example, Patent Document 4), a method using a water-absorbing polymer and a water-absorbing fiber (for example, Patent Document 5), a polyalkylene oxide modified product or this metamorphosis Examples thereof include a method using a core-sheath type mixed fiber having a mixture with polyamide or polyester as a sheath component (Patent Document 6).

However, the method of covering the synthetic fiber with a hydrophilic substance and the method of attaching an alkyl phosphate metal salt are excellent in initial hydrophilicity but do not exhibit sufficient performance in terms of water absorption and water retention.
Although a method using a water-absorbing polymer and a water-absorbing fiber is excellent in water absorption, it is generally difficult to obtain a high-strength material because it is a nonwoven fabric laminate with a water-absorbing polymer.
The method of changing the surface or cross-sectional shape of the fiber and the method of imparting porosity have problems such as being disadvantageous in terms of cost because it requires post-processing and a special manufacturing method.

Although the method using a polyalkylene oxide-modified product is excellent in water absorption, the dimensional stability is poor, and the polyalkylene oxide-modified product is poor in spinnability, so that the core-sheath fiber structure and other thermoplastic resins can be used. There was a problem that it would be difficult to make fibers unless the fibers were mixed.
On the other hand, as a nonwoven fabric having water absorbency, a so-called spunlace nonwoven fabric is known in which natural fibers such as cotton and hemp are entangled and integrated, but this nonwoven fabric has low strength and the fibers themselves are not thermoplastic. However, the processing method is limited when the nonwoven fabric is made non-woven.

Japanese Patent Laid-Open No. 2002-348779 JP-A-8-181678 JP 2001-271228 A JP 2000-290832 A JP-A-8-120550 JP-A-11-181663

  The present invention is advantageous in terms of cost because it does not require post-processing for imparting water absorbency to impart hydrophobicity to a hydrophobic synthetic fiber nonwoven fabric, and is easy to manufacture and has sufficient water absorbency and water retention. It aims at providing the nonwoven fabric which has property and is high intensity | strength.

As a result of intensive studies to solve the above-mentioned problems, the present inventors made a leap forward by laminating a water-absorbing nonwoven fabric layer composed of water-absorbing fibers copolymerized with polyalkylene glycol and a thermoplastic fiber nonwoven fabric layer. In particular, it was possible to obtain a nonwoven fabric laminate having improved water absorption and high strength.
That is, the present invention is as follows.
(1) A laminate formed from a water-absorbing nonwoven fabric layer composed of a water-absorbing fiber obtained by using a thermoplastic water-absorbing resin copolymerized with a polyalkylene glycol, and a nonwoven fabric layer composed of a thermoplastic fiber, A water-absorbent nonwoven fabric laminate comprising 1 to 99% by weight of water-absorbent fibers based on the total weight of the laminate.

(2) The water-absorbent nonwoven fabric laminate as described in (1) above, wherein the water absorption rate by a JIS-L-1096 dropping method is 50 seconds or less and the water retention is 7% or more.
(3) The thermoplastic water-absorbing resin is a copolymer of a polyester mainly composed of polytetramethylene terephthalate and a polyalkylene glycol, and the copolymerized polyester has a copolymerization amount of 5 to 90% by weight. A water-absorbent nonwoven fabric laminate as described in (1) or (2) above, wherein the laminate is a water-based resin

(4) Any one of the above (1) to (3), wherein the water-absorbing nonwoven fabric layer has a multilayer structure of two or more layers in which a nonwoven fabric layer made of a thermoplastic resin is bonded to one side or both sides. The water-absorbent nonwoven fabric laminate described in 1.
(5) The water-absorbing nonwoven fabric layered product according to any one of (1) to (4), wherein the water-absorbing nonwoven fabric layer is composed of water-absorbing continuous long fibers.
(6) The water-absorbing nonwoven fabric laminate according to any one of (1) to (5), wherein the water-absorbing nonwoven fabric layer is formed by a spunbond method or a melt blown method.

(7) The water-absorbent nonwoven fabric laminate according to any one of (1) to (6) above, wherein the thermoplastic fiber is a polyolefin, polyamide, or polyester.
(8) The water-absorbent nonwoven fabric laminate as described in any one of (1) to (7) above, wherein the nonwoven fabric layer made of thermoplastic fibers is made of continuous long fibers.
(9) The water-absorbent nonwoven fabric laminate according to any one of the above (1) to (8), wherein the nonwoven fabric layer made of thermoplastic fibers is a nonwoven fabric formed by a spunbond method or a melt blow method.

(10) The water-absorbing nonwoven fabric laminate is maintained in a predetermined shape by a partial thermocompression bonding method, a water jet method, or a needle punch method, as described in any one of (1) to (9) above Water absorbent non-woven laminate.
(11) The water-absorbing nonwoven fabric is deposited on a moving web collecting surface of a spunbond nonwoven fabric made of a thermoplastic resin, and water-absorbing fibers formed by a melt blown method are directly deposited thereon, and heat is further deposited thereon. The water-absorbent nonwoven fabric laminate as described in any one of (1) to (10) above, wherein the laminate is pressure-bonded by directly depositing a spunbond nonwoven fabric made of a plastic resin and heat embossing.

  The water-absorbent nonwoven fabric laminate using the thermoplastic water-absorbing fiber of the present invention does not require post-processing for imparting water absorption, and is advantageous in terms of cost. Therefore, it can be suitably used for applications that require water absorption / absorption and moisture absorption.

The water-absorbing nonwoven fabric laminate of the present invention is formed from a water-absorbing nonwoven fabric layer composed of water-absorbing fibers obtained by using a thermoplastic water-absorbing resin copolymerized with polyalkylene glycol, and a nonwoven fabric layer composed of thermoplastic fibers. A water-absorbing nonwoven fabric laminate, wherein the water-absorbing fibers are contained in an amount of 1 to 99% by weight based on the total weight of the laminate. Moreover, it is a water absorptive nonwoven fabric laminated body, Comprising: The water absorption rate by a JIS-L-1096 dripping method is 50 second or less, and a water retention is 7% or more, It is characterized by the above-mentioned.

Below, the structure of each nonwoven fabric is described.
(Water-absorbing non-woven fabric layer)
The water-absorbing nonwoven fabric layer used in the present invention is composed of water-absorbing fibers, and the water-absorbing fibers are composed of a water-absorbing resin having water-absorbing properties.
The water-absorbing properties of this water-absorbing resin are as follows: moisture absorption at 40 ° C. and relative humidity of 80% is 7% or more, water retention is 15% or more, preferably 40 ° C. and relative humidity of 80% is 9%. As described above, the water retention rate is 20% or more.

The water-absorbent fibers are in the range of 1 to 99% by weight, particularly preferably 5 to 80% by weight, based on the total weight of the water-absorbent nonwoven fabric laminate (hereinafter referred to as “laminate”). The water-absorbing fiber content can be set as appropriate according to the desired water absorption level, and can be designed in consideration of the balance between water absorption characteristics and laminate strength.
The water-absorbing resin is a resin comprising a copolymer of polyester and polyethylene glycol having polytetramethylene terephthalate as a main component, and the copolymerization amount of polyethylene glycol is 5 to 90% by weight, preferably 10 to 80% by weight. It is particularly preferably in the range of 30 to 60% by weight.

The melt viscosity of this copolymer is not particularly limited, but in order to obtain fibers by a conventional spunbond method or melt blow method, from the viewpoint of productivity, the melt viscosity at a shear rate of 1000 sec- ¹ is 100 to 100. It is preferable to use those in the range of 10,000 poise.
Although the fineness of the fiber used for the water-absorbing nonwoven fabric layer varies depending on the production method, a range of 0.01 to 25 dtex, particularly 0.05 to 15 dtex is appropriate.
When the melt viscosity of the water-absorbent resin is within this range, it is particularly easy to make ultrafine fibers by the melt blowing method, and an ultrafine fiber nonwoven fabric having water absorption can be obtained. The fine diameter of the ultrafine fiber is preferably in the range of 0.5 to 5 μm, and the basis weight can be in the range of 1.0 to 100 g / m ² , but is stable even in the low basis weight range ( ^{2 to} 10 g / m ² ). A non-woven fabric is obtained.

[Thermoplastic fiber nonwoven fabric layer]
Examples of the resin constituting the thermoplastic nonwoven fabric layer include polyester polymers, polyamide polymers, polyolefin polymers, and blends thereof.
Examples of the polyolefin-based polymer include polypropylene, low density polyethylene, and high density polyethylene. As for polypropylene, it may be synthesized by a general Ziegler-Natta catalyst or may be synthesized by a single site active catalyst typified by metallocene. Examples of polyethylene include linear low density polyethylene, low density polyethylene, and high density polyethylene. Furthermore, it may be a copolymer of polypropylene and polyethylene or a polymer obtained by adding polyethylene or other additives into polypropylene.

Examples of the polyamide polymer include nylon 4, nylon 6, nylon 46, nylon 66, nylon 11, nylon 12, nylon MXD6 (polymetaxylene adipamide), and the like. Furthermore, these nylon-based copolymers or a mixture thereof may be used.
Examples of the polyester-based polymer include polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, and biodegradable polyester. Furthermore, a copolymer mainly composed of these polyesters or a mixture thereof may be used.

The thermoplastic nonwoven fabric layer may be a mixed fiber in which the above water-absorbing resin is mixed, a core sheath with the water-absorbing resin, or a bonded composite fiber as long as the object of the present invention is not impaired.
The melt viscosity of the thermoplastic resin is not particularly limited, but in order to obtain fibers by a conventional spunbond method or melt blow method, the melt viscosity at a shear rate of 1000 sec- ¹ is 100 to 10,000 poise from the viewpoint of productivity. It is preferable to use the thing of the range.
The fineness of the fibers of the thermoplastic nonwoven fabric layer is 0.05 to 20 dtex, preferably 0.5 to 15 dtex. If the fineness is less than 0.05 dtex, sufficient fabric strength may not be obtained.

The fibers of the water-absorbent fiber and thermoplastic fiber nonwoven fabric layer of the present invention are not limited to the purpose of the present invention, and other commonly used additives such as impact modifiers such as various elastomers, crystals, etc. Nucleating agents, anti-coloring agents, antioxidants such as hindered phenols and hindered amines, mold release agents such as ethylenebisstearylamide and higher fatty acid esters, heat-resistant agents such as copper compounds typified by copper halides, epoxy compounds, plastics Additives such as agents, lubricants, weathering agents, flame retardants, and colorants can be added.
In the present invention, the cross section of the water-absorbing fiber and the thermoplastic nonwoven fabric layer may be a circular or elliptical shape, a polygonal shape such as a triangle or a square, or an irregular cross-sectional shape such as a flat shape or a hollow shape, and is arbitrarily set according to the required characteristics. I can do it.

[Water-absorbing nonwoven fabric laminate]
As for the content rate to the laminated body of a water absorptive fiber, 1 to 99 weight% is preferable, More preferably, it is 10 to 80 weight%. If this ratio is less than 1% by weight, water absorption cannot be sufficiently exhibited, which is not preferable. On the other hand, if it exceeds 99% by weight, the water-absorbing fibers fall off and the strength of the nonwoven fabric laminate is lowered, which causes problems in use, which is not preferable. This content can be set to an optimum condition in consideration of the application characteristics of the laminate and the balance between strength and water absorption as the laminate.

The water-absorbent nonwoven fabric laminate of the present invention is obtained using a known method, and a conventionally known method can be arbitrarily employed as the production method and the lamination method, and there is no particular limitation.
As the nonwoven fabric layer made of a water-absorbing nonwoven fabric layer and a thermoplastic resin, either short fibers or long fibers may be used, and as a forming method thereof, a direct spinning method represented by a spunbond method and a melt blow method, Any method such as a dry method such as carding or airlaid, or a wet method such as papermaking may be used.

Furthermore, as a method of adhering or entwining a web made of hygroscopic fibers with a nonwoven fabric layer made of a thermoplastic resin, a thermal bonding method such as a calender method or a through air heating method, and a water absorbent nonwoven fabric layer using an adhesive Any method such as a chemical bonding method for bonding a nonwoven fabric layer made of a thermoplastic resin, a needle punching method, a hydroentanglement method, a stitch bonding method, or the like may be used.
Non-woven fabrics obtained by the spunbond method, melt-blowing method, and lamination of these are made by directly forming long fibers without passing through the short fibers, so that the short fibers do not fall off due to breakage of the bonding part. It is used in a wide range of applications mainly in hygiene, civil engineering, architecture, agriculture / horticulture, and food packaging because it has high characteristics and productivity, and has many advantages over card-type short fiber nonwoven fabrics. It is suitable as a nonwoven fabric laminate comprising water-absorbing fibers.

As the structure of the nonwoven fabric laminate in the present invention, it is sufficient that a nonwoven fabric layer made of water-absorbing fibers and a base material made of a thermoplastic resin are laminated at least one layer each, and the number of layers to be laminated is particularly limited. However, it is preferable that the number of layers is 3 to 5 in consideration of equipment restrictions and productivity.
Furthermore, it is a nonwoven fabric laminate in which both outer layers are composed of a long-fiber nonwoven fabric made of a thermoplastic resin, and a nonwoven fabric layer made of water-absorbing fibers is arranged as an intermediate layer, and three or more layers of nonwoven fabric are laminated online. Is preferred.

By adopting such a structure, the water-absorbing fibers contained in the intermediate layer exhibit excellent water absorption, and at the same time, the dropping of water-absorbing fibers and the decrease in fabric strength when wet can be reduced. Suitable for body composition.
When a three-layer laminated structure as described above is formed online, the effect of protruding water-absorbing fibers to the outer layer due to the lamination tends to occur, and the water absorption rate can be further improved. At that time, it is preferable that the ratio of the water-absorbing fibers to the total weight of the laminate is 5 to 70% in order to prevent the strength from being reduced when wet.

As a preferred embodiment of the present invention, a water-absorbing nonwoven fabric is deposited on a web collecting surface on which a spunbond nonwoven fabric made of a thermoplastic resin is moved (S layer), and water-absorbing fibers formed by a melt blown method are directly deposited thereon. (M layer), a spunbond nonwoven fabric made of a thermoplastic resin is directly deposited thereon (S layer), and a water-absorbent nonwoven fabric laminate in which the laminate is pressure-bonded by heat embossing treatment can be mentioned. If a water-absorbing nonwoven fabric is used for the M layer of such an SMS-structured nonwoven fabric, water absorption in the M layer is ensured, strength retention by the S layer, improved wear resistance, fluff prevention, soft texture, etc. A synergistic effect of the M layer and the S layer is exhibited, and a preferable laminated nonwoven fabric is obtained. The number of layers of the laminated nonwoven fabric can be adjusted appropriately according to the application.
There is a possibility of obtaining a nonwoven fabric having a combined action of water absorption, water retention, diffusion, moisture release, etc., by laminating and integrating a nonwoven fabric made of water-absorbing fibers and a nonwoven fabric made of hydrophobic fibers by thermocompression bonding.

For example, it can be obtained by the following method.
For fiber formation of a nonwoven fabric layer composed of a thermoplastic water-absorbing nonwoven fabric and a thermoplastic resin, melt spinning may be performed using a commonly used spinneret. The spun yarn is cooled and then stretched, and the web is collected on a conveyor to obtain a fabric by an arbitrary method.
Further, the water-absorbent nonwoven fabric laminate of the present invention is provided with other conventional post-processing, for example, flame retardant, deodorant, antibacterial agent, anti-mite agent, etc., within the range not impairing the object of the present invention. Alternatively, dyeing, water-repellent processing, or the like may be performed.
Further, the shape, form, basis weight, etc. of the water-absorbent nonwoven fabric laminate of the present invention can be arbitrarily set according to the required characteristics.
The water-absorbing nonwoven fabric laminate can be subjected to printing, dyeing, coating processing, etc., and different types of materials, manufacturing methods and products can be combined.

The water-absorbing nonwoven fabric laminate of the present invention can be widely used in applications where conventional water-absorbing materials are used. For example, apparel materials such as apparel materials, disposable apparel, and shoe materials, protective apparel such as protective clothing, protective equipment, medical uses such as surgical gowns, masks, haptic base fabrics, roofing, tufted carpet base fabrics, anti-condensation sheets Architectural applications such as, reinforcing materials, protective materials, civil engineering applications such as underground pipe repair materials, automotive interiors, vehicle applications such as automobile parts, sanitary applications such as emergency supplies, cleaning products, and hand towels, carpets, furniture components, Furniture and interior applications such as wallpaper, wipers such as wet wipers and cleaning materials, filter applications such as air filters, bag filters, electret filters, bedding applications such as futons, futon bags, pillow covers, solid sheets, grass protection Agricultural / horticultural applications such as seats, garden planters, artificial leather base fabrics, synthetic leather base fabrics, PVC leather base fabrics Of artificial leather such base fabric applications, storage supplies, packaging materials such as foods, living materials applications such as kitchen utensils, electrical material, or the like industrial materials applications such as product material, equipment member.

Hereinafter, the present invention will be described more specifically with reference to examples and the like, but the present invention is not limited to these examples.
Measurement methods, evaluation methods, etc. are as follows.
<Tensile strength>
Tensile strength was evaluated by measurement according to JIS-L-1096 4.3.
<Water absorption speed>
It measured by the method shown by 6.26.1 dropping method of JIS-L-1096, and the water absorption speed was evaluated by the number of seconds required for water absorption.

<Water retention rate of nonwoven fabric>
The water retention of the nonwoven fabric was evaluated based on the water absorption represented by the following formula (1).
First, the sample was conditioned at a temperature of 20 ° C. and a relative humidity of 65% for 24 hours to measure the weight W1 (g), then immersed in tap water at a temperature of 20 ° C. for 24 hours, taken out, and centrifuged. After dehydration at 3500 rpm for 5 minutes, the weight W2 (g) was measured, and the water retention rate T0 (% by weight) was determined by the following formula (1).
Water retention rate T0 (% by weight) = [(W2-W1) / W1] × 100 (1)
<Intrinsic viscosity of polyester>
Measurement was carried out by a conventional method using orthochlorophenol as a solvent and a sample concentration of 1 g / 100 cc and a temperature of 35 ° C.

<Melt flow rate>
The melt flow rate (MFR) was measured according to the method described in JIS-K-7210.
<Relative viscosity of polyamide>
Measurement was carried out by a conventional method under the conditions of a sample concentration of 1 g / 100 cc and a temperature of 25 ° C. using sulfuric acid having a concentration of 97% as a solvent.

[Example 1]
A polypropylene resin (PP) having an MFR of 40 is supplied to a conventional spunbond melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 3000 m / min. To obtain a 2.2 dtex polypropylene fiber. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 7.5 g / m ² .
Next, a polyester resin composed of polytetramethylene terephthalate, which has an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight, and polyethylene glycol is supplied to a conventional melt blow melt spinning apparatus. The mixture was uniformly melt-mixed at 270 ° C. and melt blown from a spinneret having a spinning hole having a circular cross section to obtain a web having a basis weight of 2 g / m ^{2 made} of 2.5 μm water-absorbing fibers.

A linear pressure between a pinpoint embossing (crimping area ratio 7.1%) roll and a flat roll, which is obtained by sandwiching a web made of water-absorbing fibers from polypropylene having a basis weight of 7.5 g / m ² and heating to 135 ° C. A 17 g / m ² nonwoven fabric was prepared by partial thermocompression bonding at 45 N / cm. Table 1 shows the physical properties of the obtained nonwoven fabric. The content ratio of the water-absorbing fiber is 12%, the strength is the same as that of Comparative Example 1 described later, the water absorption speed is increased, the water retention rate is increased about 3 times that of Comparative Example 1, and the water retention is increased. Greatly improved.

[Example 2]
1. MFR40 polypropylene resin (PP) is supplied to a conventional melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt spun from a spinneret having a spinning hole having a circular cross section, and taken up at a speed of 3200 m / min. 7 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole having a circular cross section to obtain a water-absorbing web having a basis weight of 5 g / m ^{2 made} of water-absorbing and hygroscopic fibers of 2.5 μm.

Partial heat at a linear pressure of 45 N / cm between a pinpoint embossed (crimp area ratio 7.1%) roll obtained by heating the water-absorbent web and a polypropylene web having a basis weight of 15 g / m ² to 135 ° C. and a flat roll. A nonwoven fabric of 20 g / m ² was formed by pressure bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 25%, and the strength is slightly lower than that of Comparative Example 2 described later, but the water absorption speed is as fast as 30 seconds, and the water retention rate is about 7 times that of Comparative Example 2. The water retention was greatly improved. In this example, the water absorption characteristics were significantly improved while maintaining the strength.

[Example 3]
A polypropylene resin (PP) having an MFR of 40 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 230 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and taken up at a speed of 3000 m / min. A 2.2 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 10 g / m ² .
Next, a polyester resin having a polytetramethylene terephthalate as a main component and an intrinsic viscosity of 0.92 and a copolymerization ratio of polyethylene glycol of 45% by weight is supplied to a conventional melt spinning apparatus, The mixture was uniformly melt-mixed at 230 ° C., and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a basis weight of 10 g / m ^{2 made} of 3.0 dtex water-absorbing fibers.

A linear pressure of 45 N / cm between a pinpoint embossing (crimping area ratio of 7.1%) roll obtained by heating a web made of water-absorbing fibers and a polypropylene web having a basis weight of 10 g / m ² to 135 ° C. and a flat roll. And 20 g / m ² nonwoven fabric was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 50%, and the strength is slightly reduced as compared with Comparative Example 2 described later, but the water absorption speed is increased, and the water retention rate is increased to about 13 times that of Comparative Example 2, and the water retention rate is increased. The characteristics have been greatly improved. In this example, the strength slightly decreased, but a significant improvement in water absorption characteristics was observed.

[Example 4]
A polypropylene resin (PP) having an MFR of 40 is supplied to a conventional spunbond melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 3000 m / min. Taking up, a 2.2 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 7.5 g / m ² .
Next, a polyester resin having a polytetramethylene terephthalate main component and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus. The mixture was uniformly melt-mixed at 270 ° C., and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a basis weight of 2 g / m ^{2 made} of 2.5 μm water-absorbing fibers.

The obtained web made of water-absorbing fibers was sandwiched between webs made of polypropylene having a basis weight of 7.5 g / m ² , and the water pressure was 50 kg / cm ² from nozzles having a nozzle diameter of 0.15 mm, a nozzle pitch of 0.8 mm, and two rows. A columnar flow was sprayed and subjected to hydroentanglement treatment to produce a nonwoven fabric of 17 g / m ² . Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 12%, and the strength is the same level as that of Comparative Example 1 described later, the water absorption speed is increased, and the water retention rate is increased about three times that of Comparative Example 1, and the water retention rate is increased. There has been a significant improvement.

[Example 5]
A polypropylene resin (PP) having an MFR of 40 is supplied to a conventional spunbond melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 3000 m / min. Taking up, a 2.2 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 7.5 g / m ² .

Next, a polyester resin having a polytetramethylene terephthalate main component and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus. The mixture was uniformly melt-mixed at 270 ° C., and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a basis weight of 2 g / m ^{2 made} of 2.5 μm water-absorbing fibers.

The obtained web made of water-absorbing fibers was sandwiched between polypropylene webs having a basis weight of 7.5 g / m ² , punching density was 10 pieces / cm ² , and needle punching was performed at a needle penetration depth of 10 mm, and 17 g / m. ^Two nonwoven fabrics were made. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 12%, and the strength is the same level as that of Comparative Example 1 described later, the water absorption speed is increased, and the water retention rate is increased about three times that of Comparative Example 1, and the water retention rate is increased. There has been a significant improvement.

[Example 6]
Nylon 6 resin (N6) having a relative viscosity of 2.5 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web made of 2.5 μm water-absorbing and hygroscopic fibers with a basis weight of 10 g / m ² .

The resulting water-absorbing / absorbing / releasing web was sandwiched between nylon 6 fibers having a basis weight of 15 g / m ² and heated to 165 ° C. Linear pressure between a pinpoint embossed (crimp area ratio 7.1%) roll and a flat roll A 40 g / m ² non-woven fabric was prepared by partial thermocompression bonding at 45 N / cm. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 25%, and the strength is almost the same level as that of Comparative Example 3 described later, the water absorption speed is increased, and the water retention rate is increased approximately twice that of Comparative Example 3, The characteristics have been greatly improved. In this example, the water absorption characteristics were significantly improved while maintaining the strength.

[Example 7]
Nylon 6 resin (N6) having a relative viscosity of 2.5 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 20 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole having a circular cross section to obtain a water-absorbing web having a basis weight of 20 g / m ^{2 made} of water-absorbing and hygroscopic fibers of 2.5 μm.

The obtained water-absorbing web and a web made of nylon 6 fibers having a basis weight of 20 g / m ² were heated to 165 ° C., and the linear pressure was 45 N / cm between the pinpoint embossed (crimping area ratio 7.1%) roll and the flat roll. A 40 g / m ² nonwoven fabric was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber was 50%, and the strength was slightly reduced as compared with Comparative Example 3 described later, but the water absorption rate was increased and the water retention rate was increased about 4 times that of Comparative Example 3, and the water retention rate was increased. There has been a significant improvement. In this example, the strength slightly decreased, but a significant improvement in water absorption characteristics was observed.

[Example 8]
Nylon 6 resin (N6) having a relative viscosity of 2.5 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 20 g / m ² .

Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt spinning apparatus and uniformly distributed at 270 ° C. The mixture was melt-mixed and melt-spun from a spinneret having a spinning hole having a circular cross section to obtain a water-absorbing web having a basis weight of 20 g / m ^{2 made} of water-absorbing and hygroscopic fibers of 3.0 dtex. The obtained water-absorbing web and a web made of nylon 6 fibers having a basis weight of 20 g / m ² were heated to 165 ° C., and the linear pressure was 45 N / cm between the pinpoint embossed (crimping area ratio 7.1%) roll and the flat roll. A 40 g / m ² nonwoven fabric was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber was 50%, and the strength was slightly reduced as compared with Comparative Example 3 described later, but the water absorption rate was increased and the water retention rate was increased about 4 times that of Comparative Example 3, and the water retention rate was increased. There has been a significant improvement. In this example, the strength slightly decreased, but a significant improvement in water absorption characteristics was observed.

[Example 9]
Nylon 6 resin (N6) having a relative viscosity of 2.5 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web made of 2.5 μm water-absorbing and hygroscopic fibers with a basis weight of 10 g / m ² .

The obtained water-absorbing and moisture-releasing web is sandwiched between nylon 6 fibers having a basis weight of 15 g / m ² , a nozzle diameter of 0.15 mm, a nozzle pitch of 0.8 mm, and a water pressure of 50 kg / cm ² from two rows of nozzles. A columnar flow was sprayed and subjected to hydroentanglement treatment to produce a 40 g / m ² nonwoven fabric. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 25%, and the strength is almost the same level as that of Comparative Example 3 described later, the water absorption speed is increased, and the water retention rate is increased approximately twice that of Comparative Example 3, The characteristics have been greatly improved. In this example, significant improvement in water absorption characteristics was observed without losing strength.

[Example 10]
Nylon 6 resin (N6) having a relative viscosity of 2.5 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web made of 2.5 μm water-absorbing and hygroscopic fibers with a basis weight of 10 g / m ² .

The obtained water-absorbing / releasing moisture-absorbing web is sandwiched between nylon 6 fibers having a basis weight of 15 g / m ² and subjected to a needle punching process with a punching density of 10 pieces / cm ² and a needle penetration depth of 10 mm. ^Two nonwoven fabrics were made. Table 1 shows the physical properties of the obtained nonwoven fabric.
The content ratio of the water-absorbing fiber is 25%, and the strength is almost the same as that of Comparative Example 3 to be described later, the water absorption speed is increased, and the water retention rate is increased about twice that of Comparative Example 3. The water retention was greatly improved. In this example, significant improvement in water absorption characteristics was observed without losing strength.

[Example 11]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a weight per unit area of 20 g / m ² made of water-absorbing fibers of 2.5 μm.

The obtained water-absorbing web was sandwiched between polyethylene terephthalate fibers having a basis weight of 30 g / m ² and heated to 165 ° C. between a rectangular pattern embossed (crimp area 11.4%) roll and a flat roll at a linear pressure of 45 N / cm. A non-woven fabric of 80 g / m ² was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 25%, the strength is almost the same as that of Comparative Example 5 described later, the water absorption rate is significantly faster, and the water retention rate is 31%, which is about 5 times that of Comparative Example 5. The water retention was greatly improved. In this example, significant improvement in water absorption characteristics was observed without impairing strength.

[Example 12]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. 30 g of basis weight made of 2.5 μm water-absorbing fibers melt-spun from a spinneret having a spinning hole with a circular cross section
A water-absorbing / releasing moisture-absorbing web having an area of m ² was obtained.

The resulting water-absorbing / absorbing / releasing web was sandwiched between polyethylene terephthalate fibers having a basis weight of 15 g / m ² and heated to 165 ° C. between a rectangular pattern embossed (crimp area 11.4%) roll and a flat roll with a linear pressure of 45 N A non-woven fabric of 60 g / m ² was prepared by partial thermocompression bonding at / cm. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 50%. Compared to Comparative Example 6 described later, the water absorption speed is 2.8 seconds, and the water retention rate increases to 47%, which is about 8 times that of Comparative Example 6. The water retention was greatly improved.

[Example 13]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 10 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt-spun from a spinneret having a spinning hole having a circular cross-section to obtain a web having a basis weight of 60 g / m ^{2 made} of 2.5 μm water-absorbing fibers.

The obtained water-absorbing and moisture-releasing web was sandwiched between polyethylene terephthalate fibers having a basis weight of 10 g / m ² and heated to 165 ° C. between a rectangular pattern embossed (crimp area 11.4%) roll and a flat roll with a linear pressure of 45 N A non-woven fabric of 80 g / m ² was prepared by partial thermocompression bonding at / cm. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 75%. Compared to Comparative Example 6 described later, the water absorption speed is significantly faster at 0.8 seconds, and the water retention rate is increased to about 10% of Comparative Example 6 to 65%. The water retention was greatly improved.

[Example 14]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a basis weight of 10 g / m ^{2 made} of 2.5 μm water-absorbing fibers.

The obtained water-absorbing web and a web made of polyethylene terephthalate fibers having a basis weight of 30 g / m ² were heated at 165 ° C. between a rectangular pattern embossed (crimp area 11.4%) roll and a flat roll at a linear pressure of 45 N / cm. A non-woven fabric of 60 g / m ² was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 50%, and the water absorption rate is significantly faster at 0.8 seconds than Comparative Example 6 described later, and the water retention rate increases to 48%, about 8 times that of Comparative Example 6. The water retention was greatly improved.

[Example 15]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.77 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt spinning apparatus and uniformly distributed at 230 ° C. The mixture was melt-mixed and melt-spun from a spinneret having a spinning hole with a circular cross section to obtain a web made of 3.0 dtex water-absorbing fibers with a basis weight of 30 g / m ² .

The resulting water-absorbing web was formed of a polyethylene terephthalate fiber having a basis weight of 30 g / m ² and heated to 165 ° C. between a rectangular embossed (crimp area 11.4%) roll and a flat roll at a linear pressure of 45 N / cm. A non-woven fabric of 60 g / m ² was prepared by partial thermocompression bonding. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 50%, and the water absorption rate is significantly faster at 0.8 seconds than Comparative Example 6 described later, and the water retention rate increases to 48%, about 8 times that of Comparative Example 6. The water retention was greatly improved.

[Example 16]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. The mixture was melt-mixed and melt spun from a spinneret having a spinning hole with a circular cross section to obtain a web having a weight per unit area of 20 g / m ² made of water-absorbing fibers of 2.5 μm.

The obtained water-absorbing web was sandwiched between webs made of polyethylene terephthalate fibers having a basis weight of 30 g / m ² , and a columnar flow having a nozzle diameter of 0.15 mm, a nozzle pitch of 0.8 mm, and a water pressure of 50 kg / cm ² from two nozzles. Were sprayed and subjected to hydroentanglement treatment to prepare an 80 g / m ² nonwoven fabric. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 25%, the strength is slightly increased compared to Comparative Example 5 described later, the water absorption speed is significantly faster, 10 seconds, and the water retention rate is about 5 times that of Comparative Example 5. The water retention was greatly improved.

[Example 17]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.70 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, a copolyester resin of polytetramethylene terephthalate and polyethylene glycol having an intrinsic viscosity of 0.92 and a polyethylene glycol copolymerization ratio of 45% by weight is supplied to a conventional melt blow melt spinning apparatus, and uniform at 270 ° C. Is melt-spun from a spinneret having a spinning hole having a circular cross section, and a basis weight of 2.5 g of water-absorbing fiber is 20 g.
A water-absorbing web of / m ² was obtained.

The obtained water-absorbing web was sandwiched between polyethylene terephthalate fibers having a basis weight of 30 g / m ² , punching density was 10 pieces / cm ² , needle penetration depth was 10 mm, and needle punching was performed to give 80 g / m ^2. A non-woven fabric was prepared. Table 1 shows the physical properties of the obtained nonwoven fabric.
The water-absorbing fiber content is 25%, the strength is slightly increased compared to Comparative Example 5 described later, the water absorption speed is significantly faster, 10 seconds, and the water retention rate is about 5 times that of Comparative Example 5. The water retention was greatly improved.

[Comparative Example 1]
1. MFR40 polypropylene resin (PP) is supplied to a conventional melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt spun from a spinneret having a spinning hole having a circular cross section, and taken up at a speed of 3000 m / min. A 2 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 7.5 g / m ² .
Next, MFR900 polypropylene is supplied to a conventional melt blow melt spinning apparatus, melted and mixed uniformly at 270 ° C., melt spun from a spinneret having a spinning hole with a circular cross section, and a basis weight made of 2.5 μm polypropylene fiber. A 2 g / m ² web was obtained.

The obtained 2.5 μm polypropylene web was sandwiched between polypropylene webs having a basis weight of 7.5 g / m ² and heated at 135 ° C. between a pinpoint embossed (crimp area 7.1%) roll and a flat roll. A 17 g / m ² nonwoven fabric was prepared by partial thermocompression bonding at 45 N / cm. Table 2 shows the physical properties of the obtained nonwoven fabric.
The laminated nonwoven fabric of Comparative Example 1 obtained had a water absorption rate of 60 seconds or more and hardly absorbed water, and the water retention rate was a very low level of 3.6%.

[Comparative Example 2]
1. MFR40 polypropylene resin (PP) is supplied to a conventional melt spinning apparatus, melted and mixed uniformly at 230 ° C., melt spun from a spinneret having a spinning hole having a circular cross section, and taken up at a speed of 3000 m / min. 7 dtex polypropylene fiber was obtained. The obtained polypropylene fiber was spread and dispersed to form a web having a basis weight of 20 g / m ² , and a linear pressure of 45 N / cm between a pinpoint embossed (crimp area 7.1%) roll heated to 135 ° C. and a flat roll. Was subjected to partial thermocompression bonding to produce a 20 g / m ² non-woven fabric. Table 2 shows the physical properties of the obtained nonwoven fabric.
The laminated nonwoven fabric of Comparative Example 2 obtained had a water absorption rate of 60 seconds or more and hardly absorbed water, and the water retention rate was a very low level of 3.4%.

[Comparative Example 3]
Nylon 6 resin (N6) having a relative viscosity of 2.6 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The obtained nylon 6 fiber was spread and dispersed to form a web having a basis weight of 15 g / m ² .
Next, nylon 6 having a relative viscosity of 1.6 is supplied to a conventional melt blow melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and 2.5 μm. A web made of nylon 6 fibers having a basis weight of 10 g / m ² was obtained.

The obtained 2.5 μm nylon 6 web is sandwiched between nylon 6 webs having a basis weight of 15 g / m ² , and a wire is formed between a pinpoint embossed (crimp area 7.1%) roll heated to 175 ° C. and a flat roll. Partial thermocompression bonding was performed at a pressure of 45 N / cm to prepare a 40 g / m ² nonwoven fabric. Table 2 shows the physical properties of the obtained nonwoven fabric.
The obtained laminated nonwoven fabric of Comparative Example 3 had a water absorption rate of almost low water absorption for 40 seconds, and a water retention rate as low as 12.8%.

[Comparative Example 4]
Nylon 6 resin (N6) having a relative viscosity of 2.6 is supplied to a conventional melt spinning apparatus, uniformly melt-mixed at 260 ° C., melt-spun from a spinneret having a spinning hole having a circular cross section, and a speed of 4250 m / min. To obtain 2.0 dtex of nylon 6 fiber. The resulting nylon 6 fiber was spread and dispersed to form a web having a basis weight of 40 g / m ² , and a linear pressure of 45 N / b between a pinpoint embossed (crimp area 7.1%) roll and flat roll heated to 185 ° C. A 40 g / m ² non-woven fabric was prepared by partial thermocompression bonding at cm. Table 2 shows the physical properties of the obtained nonwoven fabric.
The obtained laminated nonwoven fabric of Comparative Example 4 had a water absorption rate of almost 45 seconds and a low water absorption rate of 12.3%.

[Comparative Example 5]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.77 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 30 g / m ² .
Next, polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.49 is supplied to a conventional melt blow melt spinning apparatus, uniformly melted and mixed at 310 ° C., and melt spun from a spinneret having a spinning hole having a circular cross section. A web having a basis weight of 20 g / m ² made of polyethylene terephthalate fibers of 2.5 μm was obtained.

The obtained 2.5 μm web was sandwiched between polyethylene terephthalate fibers having a basis weight of 30 g / m ² and heated to 230 ° C. between a rectangular pattern embossed (crimp area 11.4%) roll and a flat roll at a linear pressure of 45 N / A 80 g / m ² nonwoven fabric was prepared by partial thermocompression bonding at cm. Table 2 shows the physical properties of the obtained nonwoven fabric.
The laminated nonwoven fabric of Comparative Example 5 obtained had a water absorption rate of 60 seconds or more, showed almost no water absorption, and had a low water retention rate of 6.0%.

[Comparative Example 6]
Polyethylene terephthalate resin (PET) having an intrinsic viscosity of 0.77 is supplied to a conventional melt spinning apparatus, uniformly melted and mixed at 290 ° C., melt-spun from a spinneret having a spinning hole with a circular cross section, and a speed of 4500 m / min. To obtain a polyethylene terephthalate fiber of 2.0 dtex. The obtained polyethylene terephthalate fiber was spread and dispersed to form a web having a basis weight of 60 g / m ² , and a linear pressure 45 N / b between a rectangular pattern embossed (crimp area 11.4%) roll heated to 220 ° C. and a flat roll. A 60 g / m ² non-woven fabric was prepared by partial thermocompression bonding at cm. Table 2 shows the physical properties of the obtained nonwoven fabric.
The laminated nonwoven fabric of Comparative Example 6 thus obtained had a water absorption rate of 60 seconds or more, hardly exhibited water absorption, and had a low water retention rate of 5.8%.

  The water-absorbing nonwoven fabric laminate of the present invention can be widely used in applications where conventional water-absorbing materials are used, such as apparel applications such as apparel members, disposable apparel, shoe members, protective clothing, protective articles, etc. Medical use such as protective use, surgical clothes, masks, haptic base fabrics, roofing, tuft / carpet base fabrics, anti-condensation sheets, etc., civil engineering uses such as reinforcing materials, protective materials, repair materials for underground pipes , Automotive interiors, automotive parts and other vehicle applications, emergency supplies, cleaning products, hand towels and other hygiene applications, carpets, furniture parts, wallpaper and other furniture / interior applications, wet wipers, cleaning materials and other wiper applications, air filters, bugs Filter applications such as filters and electret filters, bedding applications such as futons, futon bags, pillow covers, solid sheets, grass protection sheets Agricultural and horticultural applications such as horticultural planters, artificial leather base fabrics, synthetic leather base fabrics, artificial leather base fabrics such as PVC leather base fabrics, storage materials, packaging materials such as food, kitchen utensils, etc. It is used for industrial materials such as materials, electrical materials, product materials, and equipment members.

Claims (11)

  A water-absorbing nonwoven fabric layer composed of a water-absorbing fiber obtained by using a thermoplastic water-absorbing resin copolymerized with a polyalkylene glycol and a nonwoven fabric layer composed of a thermoplastic fiber, the water-absorbing fiber Is contained in an amount of 1 to 99% by weight based on the total weight of the laminate.   The water-absorbing nonwoven fabric laminate according to claim 1, wherein the water absorption rate by a JIS-L-1096 dropping method is 50 seconds or less and the water retention is 7% or more.   The thermoplastic water-absorbing resin is a copolymer of a polyester mainly composed of polytetramethylene terephthalate and a polyalkylene glycol, and the copolymerized polyester resin has a copolymerization amount of 5 to 90% by weight of the polyalkylene glycol. The water-absorbent nonwoven fabric laminate according to claim 1 or 2, wherein   The water-absorbent nonwoven fabric according to any one of claims 1 to 3, wherein the water-absorbent nonwoven fabric has a multilayer structure of two or more layers in which a nonwoven fabric layer made of a thermoplastic resin is bonded to one surface or both surfaces of the water-absorbent nonwoven fabric layer. Laminated body.   The water-absorbing nonwoven fabric laminate according to any one of claims 1 to 4, wherein the water-absorbing nonwoven fabric layer is composed of water-absorbing continuous long fibers.   The water-absorbing nonwoven fabric laminate according to any one of claims 1 to 5, wherein the water-absorbing nonwoven fabric layer is formed by a spunbond method or a melt blow method.   The water-absorbent nonwoven fabric laminate according to any one of claims 1 to 6, wherein the thermoplastic fiber is a polyolefin-based, polyamide-based, or polyester-based material.   The water-absorbing nonwoven fabric laminate according to any one of claims 1 to 7, wherein the nonwoven fabric layer made of thermoplastic fibers is made of thermoplastic continuous long fibers.   The water-absorbent nonwoven fabric laminate according to any one of claims 1 to 8, wherein the nonwoven fabric layer made of thermoplastic fibers is a nonwoven fabric formed by a spunbond method or a melt blow method.   The water-absorbent nonwoven fabric laminate according to any one of claims 1 to 9, wherein the water-absorbent nonwoven fabric laminate is bonded by a partial thermocompression bonding method, a water jet method, or a needle punch method.   The water-absorbing nonwoven fabric laminate is deposited on a moving web collecting surface of a spunbond nonwoven fabric made of a thermoplastic resin, on which water-absorbing fibers formed by a melt-blowing method are directly deposited, and a thermoplastic resin is further deposited thereon. The water-absorbent nonwoven fabric laminate according to claim 1, wherein a spunbond nonwoven fabric made of resin is directly deposited and the laminate is pressure-bonded by heat embossing.