JP2001348766A - Nonwoven fabric for extrusion lamination and film- nonwoven fabric composite using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a nonwoven fabric for extrusion lamination capable of being directly extruded and laminated onto a film and excellent in interlaminar strength and a film-nonwoven fabric composite using the nonwoven fabric and readily producible and processable and further the film-nonwoven composite excellent in strength, touch feeling, water resistance and moisture permeability and suitable as sanitary materials. SOLUTION: This nonwoven fabric for extrusion lamination has a mixed resin comprising (A) a polyolefin and at least one kind selected from (B1) a modified polyolefin modified with an unsaturated carboxylic acid or its derivative, (B2) an ethylenic copolymer containing a comonomer unit having a polar group and (B3) a modified thermoplastic elastomer prepared by modifying a thermoplastic elastomer with an unsaturated carboxylic acid or its derivative on the outer surfaces of filaments constituting the nonwoven fabric. The film- nonwoven fabric composite suitable as the sanitary materials is obtained by integrating the nonwoven fabric with a thermoplastic resin film, providing the composite and using an elastomer having moisture permeability as the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric suitable for extrusion lamination, and a film and a nonwoven fabric using the same.
The present invention relates to a nonwoven fabric composite.

[0002]

BACKGROUND OF THE INVENTION Nonwoven fabrics typified by spunbonded nonwoven fabrics have recently been used for various applications.
Further, improvement of various characteristics is required according to the use. For example, nonwoven fabrics used as a part of sanitary materials such as gathers of disposable diapers, sanitary napkins and the like, and base fabrics of compresses are required to have water resistance and excellent moisture permeability. In addition, depending on the place where it is used, it is also required to have excellent elasticity.

For example, sanitary materials such as disposable diapers have a structure in which an absorbent for absorbing and retaining bodily fluids is wrapped and enclosed by a facing material inside an absorbent article and a back sheet outside. The facing material is required to have a function of transmitting the body fluid discharged in contact with the skin, absorbing the body fluid into the absorbing material, and preventing the body fluid from returning from the absorbing material. On the other hand, the back sheet has a water resistance that does not leak the body fluid absorbed by the internal absorbent material to the outside, and in order to prevent stuffiness due to moisture generated inside, the moisture inside the absorbent article is transmitted and dissipated to the outside. It is required to have appropriate moisture permeability for the purpose. Furthermore, since this back sheet constitutes the outer surface of the sanitary material, it is required to have an excellent texture and a good touch.

[0004] Nonwoven fabrics having excellent texture and tactile sensation and having water resistance and moisture permeability include nonwoven fabrics spun by a melt blow method and spunbonded nonwoven fabrics laminated thereon to increase strength. Water resistance is insufficient for applications. Therefore, non-woven fabric as the outer surface layer,
A multilayer sheet using a porous polyethylene film for the inner layer is used. However, the multi-layer sheet used for the conventional back sheet requires many steps, such as a porous film forming step for polyethylene film and an adhesive step for bonding nonwoven fabric and porous polyethylene film with a hot melt adhesive. However, it became complicated and caused a cost increase. Moreover, the multilayer sheet used for the conventional back sheet is also inferior in elasticity.

[0005]

SUMMARY OF THE INVENTION The present invention aims to solve the problems associated with the prior art as described above, and is intended to provide a nonwoven fabric which can be directly extruded and laminated with a film and has excellent interlayer adhesion strength. To provide a film / nonwoven fabric composite which is easy to manufacture and process, and further provides a film / nonwoven fabric composite having excellent strength and texture, excellent water resistance and moisture permeability, and suitable for sanitary materials. And

[0006]

According to the present invention, a nonwoven fabric for extrusion lamination described in the following (1) to (6) is provided, and a film / nonwoven fabric composite described in (7) to (13) is provided. Is provided.

(1) [A] Polyolefin (A)
[B] Modified polyolefin (B1) modified with an unsaturated carboxylic acid or a derivative thereof, an ethylene copolymer containing a comonomer unit having a polar group (B2), and a thermoplastic elastomer modified with an unsaturated carboxylic acid or a derivative thereof A nonwoven fabric for extrusion lamination, characterized in that the nonwoven fabric for extrusion lamination has a mixed resin containing at least one selected from the modified thermoplastic elastomer (B3) on at least all or a part of the outer surface of filaments constituting the nonwoven fabric.

(2) The content of a unit derived from an unsaturated carboxylic acid or a derivative thereof in the mixed resin is 0.01 or less.
(1) The nonwoven fabric for extrusion lamination according to (1), wherein the content of the comonomer unit having a polar group in the mixed resin is 10 to 50% by weight. (3) The nonwoven fabric for extrusion lamination according to (1) or (2), wherein the nonwoven fabric is a spunbonded nonwoven fabric.

(4) The nonwoven fabric for extrusion lamination according to any one of (1) to (3), wherein the filament is a concentric or eccentric core-sheath or side-by-side bicomponent fiber. (5) The ethylene polymer (B2) containing the comonomer unit having a polar group is an ethylene / ethyl acrylate copolymer, an ethylene / vinyl acetate copolymer, an ethylene / methacrylic acid copolymer, or an ethylene ionomer resin. And a non-woven fabric for extrusion lamination according to any one of (1) to (4), which is an ethylene polymer selected from a resin obtained by modifying an ethylene / ethyl acrylate copolymer with an unsaturated carboxylic acid or a derivative thereof.

(6) The base polymer of the modified thermoplastic elastomer (B3) is a urethane elastomer,
It is a thermoplastic elastomer selected from styrene-based elastomer, polyester-based elastomer, olefin-based elastomer, and polyamide-based elastomer (1) to
The nonwoven fabric for extrusion lamination according to any of (5).

(7) A film / nonwoven fabric composite, wherein the nonwoven fabric according to any one of claims 1 to 6 and the thermoplastic resin film are integrally combined. (8) The thermoplastic resin film is formed using an elastomer (C) having moisture permeability.
2. The film / nonwoven fabric composite according to item 1.

(9) The film / nonwoven fabric composite according to (8), wherein the moisture-permeable elastomer is a thermoplastic elastomer selected from urethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers. (10) The film / nonwoven fabric composite according to (9), which has a moisture permeability of 2000 g / m ² · day or more and a water pressure resistance of 1000 mmAq or more.

(11) The average diameter of the filaments constituting the nonwoven fabric is 5 to 30 μm, and the basis weight of the nonwoven fabric is 5 μm.
５０50 g / m ² , and the basis weight of the film is 5-30.
g / m ² , the film / nonwoven fabric composite according to (10). (12) The interlayer adhesive strength between the film and the nonwoven fabric is 50 g /
The film / nonwoven fabric composite according to any one of (6) to (11), which is not less than 25 mm. (13) The film / nonwoven fabric composite according to any one of (6) to (12), wherein the composite is integrated by extrusion lamination.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Nonwoven fabric for extrusion lamination According to the present invention, a nonwoven fabric for extrusion lamination suitable for extrusion lamination molding with a film is [A] a polyolefin (A) and [B] an unsaturated carboxylic acid or a derivative thereof. From modified polyolefin (B1) modified with styrene, ethylene-based copolymer containing comonomer unit having polar group (B2), and modified thermoplastic elastomer (B3) obtained by modifying thermoplastic elastomer with unsaturated carboxylic acid or its derivative The mixed resin containing at least one selected from the group forms at least all or a part of at least the outer surfaces of the filaments constituting the nonwoven fabric. First, the resin forming the nonwoven fabric filament will be described.

The resin used for molding the nonwoven fabric of the present invention is a modified polyolefin (B1) obtained by modifying a polyolefin (A) with an unsaturated carboxylic acid or a derivative thereof.
At least one resin selected from an ethylene copolymer (B2) containing a comonomer unit having a polar group and a modified thermoplastic elastomer (B3) obtained by modifying a thermoplastic elastomer with an unsaturated carboxylic acid or a derivative thereof is added. It is a mixed resin.

As the polyolefin (A), ethylene, propylene, 1-butene, 1-pentene, 1-hexene,
2- to 2-carbons such as 4-methyl-1-pentene and 1-octene
Examples thereof include a homopolymer of an α-olefin having 0, preferably 2 to 8 carbon atoms, or a copolymer with another α-olefin. Other α-olefins include the same olefins as described above.

Specifically, ethylene homopolymer, ethylene and propylene, 1-butene, 1-pentene, 1-hexene,
Ethylene polymers such as copolymers with other α-olefins such as 4-methyl-1-pentene and 1-octene, propylene homopolymers, and copolymers of propylene with other α-olefins such as ethylene Propylene polymer, polybutene, poly-4-methyl-1-pentene, and the like.

As the ethylene polymer, an ethylene homopolymer and a copolymer containing about 10 mol% or less of other α-olefin are preferably used. Examples of the propylene polymer include a homopolymer of propylene or a copolymer of propylene with an α-olefin such as ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene. . The copolymer may be a random copolymer or a block copolymer. These polyolefins can be used alone or in combination of two or more.

The modified polyolefin (B1) modified with an unsaturated carboxylic acid or a derivative thereof, which is a resin added to the above polyolefin (A), includes a polyolefin obtained by a graft reaction of an unsaturated carboxylic acid or a derivative thereof. Can be. The same polyolefin as the polyolefin (A) can be used as the polyolefin as the base polymer for the graft reaction.

Examples of the unsaturated carboxylic acid or its derivative that undergoes a graft reaction include, for example, maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid ^TM (endocis-bicyclo [2.2 .1] Hept-5-ene-2,3-dicarboxylic acid), acrylic acid, unsaturated carboxylic acids such as methacrylic acid, or derivatives thereof, for example, acid anhydrides of the above unsaturated carboxylic acids, imides, Examples include amides and esters. Specific examples of the derivative include maleimide, maleic anhydride, citraconic anhydride, monomethyl maleate, glycidyl maleate and the like. Among these, unsaturated carboxylic acids and their acid anhydrides are preferred, and maleic acid, Nadic acid ^™ and their acid anhydrides are particularly preferred.

Conventionally known methods can be used to produce a modified product by graft copolymerization of the above-mentioned unsaturated carboxylic acid or a derivative thereof as a graft monomer with the polyolefin. For example,
A melt modification method in which a polyolefin is melted and a graft monomer is added to carry out graft copolymerization, or a solution modification method in which a polyolefin is dissolved in a solvent and a graft monomer is added to carry out graft copolymerization can be used.

In order to obtain a modified polyolefin by efficiently grafting the modifying monomer to the base polymer, it is preferable to carry out the reaction in the presence of a radical initiator. In this case, the grafting reaction is usually performed at a temperature of 60 to 350 ° C. The usage ratio of the radical initiator is usually in the range of 0.001 to 2 parts by weight based on 100 parts by weight of the base polymer.

Examples of the radical initiator include dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexyne-3,2,5-dimethyl- 2,5-di (tert-butylperoxy) hexane, 1,4-
Organic peroxides such as bis (tert-butylperoxyisopropyl) benzene are preferred.

The modified polyolefin (B1) used in the present invention
Has a modified amount of 0.0 as a graft monomer content.
1 to 10% by weight, further 0.1 to 5% by weight, especially 1 to
It is preferred that the modification be made in the range of 5% by weight. When the amount of modification is within the above range, the interlayer adhesion between the film and the nonwoven fabric becomes good when the film / nonwoven fabric composite is produced.

The ethylene copolymer (B2) containing a comonomer unit having a polar group, which is a resin added to the polyolefin (A), is a copolymer of ethylene and a monomer having a polar group. Alternatively, a polymer obtained by modifying an ethylene polymer with a monomer compound having a polar group may be used.

The copolymer of ethylene and a monomer having a polar group may be prepared, for example, by mixing ethylene and a monomer having a polar group (hereinafter referred to as a polar group-containing monomer) at a high temperature and a high pressure in the presence of an organic peroxide or oxygen. It can be obtained by a radical polymerization reaction below.

The polar group-containing monomer is a compound having a polar group that can be copolymerized with ethylene, and specific examples thereof include ethyl acrylate, methacrylic acid, methyl methacrylate, vinyl acetate, and vinyl chloride. Among these, at least one selected from the group consisting of ethyl acrylate, methacrylic acid, and vinyl acetate is preferred, and ethyl acrylate is particularly preferred because of its excellent heat resistance.

In the ethylene-ethyl acrylate copolymer (hereinafter sometimes abbreviated as EEA) which can be used as the ethylene polymer (B2) in the present invention, the content of the ethyl acrylate unit is as follows: In terms of adhesion and cost, it is usually 10 to 50% by weight, preferably 10 to 50% by weight.
40% by weight, more preferably 15 to 30% by weight
It is. The melt flow rate (ASTM D123
8 at a temperature of 190 ° C. under a load of 2.16 kg) is usually 5 to 50 g / 10 min, preferably 10 to 30 g
g / 10 minutes. When the ethyl acrylate unit content and the melt flow rate are in such ranges, a nonwoven fabric having good moldability and interlayer adhesion when a film / nonwoven fabric composite is produced can be obtained. Commercially available ethylene / ethyl acrylate copolymers include Evaflex ^™ -EEA manufactured by DuPont-Mitsui Polychemicals (for example, brand A-70).
7).

In the ethylene / vinyl acetate copolymer (hereinafter sometimes abbreviated as EVA), which can be used as the ethylene polymer (B2) in the present invention, the content of vinyl acetate unit is determined by the adhesive property. , Usually 1 in terms of cost
It is 0 to 50% by weight, preferably 10 to 40% by weight, and more preferably 3 to 10% by weight. The melt flow rate (measured at a temperature of 190 ° C. and a load of 2.16 kg according to ASTM D1238) is usually 5 to 5.
200 g / 10 min, preferably 10 to 150 g / 10 min. When the vinyl acetate content and the melt flow rate are in such ranges, a nonwoven fabric having good moldability and interlayer adhesion when a film / nonwoven fabric composite is produced can be obtained.
Commercial products of the ethylene / vinyl acetate copolymer include Evaflex ^™ (for example, brand name P-2807) manufactured by DuPont-Mitsui Polychemicals.

In the ethylene-methacrylic acid copolymer which can be used as the ethylene polymer (B2) in the present invention, the content of the methacrylic acid unit is usually from 10 to 50 in terms of adhesiveness and cost. %, Preferably 10 to 40% by weight, more preferably 3 to 10% by weight. The melt flow rate (ASTM D1
238, measurement at a temperature of 190 ° C. under a load of 2.16 kg) is usually 5 to 100 g / 10 min, preferably 10 to 10 g / 10 min.
80 g / 10 min. When the methacrylic acid unit content and the melt flow rate are in such ranges, a nonwoven fabric having good moldability and interlayer adhesion when a film / nonwoven fabric composite is produced can be obtained. As a commercial product of the ethylene / methacrylic acid copolymer, Nuclel ^™ manufactured by DuPont-Mitsui Polychemicals, Inc. may be mentioned.

Examples of the ethylene ionomer resin which can be used as the ethylene polymer (B2) in the present invention include a metal salt of a copolymer of ethylene and an unsaturated carboxylic acid. Here, the ionomer is a thermoplastic resin having a small amount of an ionic group in a side chain, a terminal chain or a main chain in a hydrophobic polymer main chain. As the unsaturated carboxylic acid, graft reaction with the above-mentioned modified polyolefin (B1) such as maleic acid, fumaric acid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid ^TM , acrylic acid, methacrylic acid, etc. Carboxylic acid or a derivative thereof used for the above.

The metal ions used for neutralization are 1
Metal ions having a valence of 1 to 3 valences, particularly metal ions having a valence of 1 to 3 valences of Groups I, II, III, IV-A and VII of the Periodic Table of the Elements are preferred. Specifically, metal ions having a valence of 1 to 3 such as sodium, potassium, lithium, copper, magnesium, calcium, lead, iron, cobalt, nickel, zinc, and aluminum can be exemplified. Of these, zinc and sodium ions are preferred in terms of toxicity. The above metal ions may be used as a mixture of two or more kinds. Commercially available ethylene ionomer resins include Himilan ^™ (manufactured by DuPont-Mitsui Polychemicals) using methacrylic acid as an acid monomer.

The polymer obtained by modifying the ethylene polymer with the monomer compound containing a polar group, which can be used as the ethylene polymer (B2) in the present invention, includes the above-mentioned ethylene polymer containing the polar group. A polymer modified with a monomer is exemplified. Examples of the ethylene polymer include a copolymer of ethylene and an α-olefin containing a relatively large amount of α-olefin. Such an ethylene polymer may be highly crystalline or low crystalline. Examples of the polar group-containing monomer compound that can be used for modifying the ethylene polymer include the above-described compounds having a polar group that can be copolymerized with ethylene. Examples of the modification method used include the above-described graft reaction.

In the present invention, as the ethylene-based polymer (B2), a copolymer of ethylene and a polar group-containing monomer is modified with the aforementioned compound having a polar group containing an unsaturated carboxylic acid or a derivative thereof. May be used. For example, a modified resin obtained by modifying the above-mentioned ethylene / ethyl acrylate copolymer with an unsaturated carboxylic acid can also be used. The use of a modified resin is preferable because the interlayer adhesion between the film and the nonwoven fabric can be improved when a film / nonwoven fabric composite is produced, as compared with the case where an unmodified resin is used. This modified resin has a graft monomer content indicating the modification ratio, usually 0.01 to 10%.
%, Preferably 0.1 to 5% by weight, more preferably 0.1 to 3% by weight. Commercially available products include resins obtained by modifying EEA with maleic anhydride.

As the thermoplastic elastomer modified product (B3), which is a resin added to the above-mentioned polyolefin (A), which is obtained by modifying a thermoplastic elastomer with an unsaturated carboxylic acid or a derivative thereof, urethane-based elastomer, styrene-based elastomer, polyester Thermoplastic elastomers obtained by grafting an unsaturated carboxylic acid or a derivative thereof to a thermoplastic elastomer selected from a series elastomer, an olefin elastomer, and a polyamide elastomer in the same manner as described above.

The modified thermoplastic elastomer (B3) used in the present invention has a modified amount of 0.01 to 10% by weight, more preferably 0.1 to 5% by weight as a graft monomer content.
In particular, it is preferable to be modified in the range of 1 to 5% by weight.
When the amount of modification is within the above range, the interlayer adhesion between the film and the nonwoven fabric becomes good when the film / nonwoven fabric composite is produced.

The polyolefin (A) includes at least one selected from a modified polyolefin (B1), an ethylene copolymer (B2), and a modified thermoplastic elastomer (B3).
In the mixed resin to which the kinds of resins are added, the content of the unit derived from the unsaturated carboxylic acid or the derivative thereof in the mixed resin is 0.01 to 5% by weight, or the polarity in the mixed resin is The content of the comonomer unit having a group is preferably from 10 to 50% by weight. When the content of the unsaturated carboxylic acid or its derivative unit or the content of the polar group-containing monomer unit is within the above range, the film
When a nonwoven fabric composite is produced, the interlayer adhesion between the film and the nonwoven fabric becomes good.

The polyolefin (A) and at least one selected from a modified polyolefin (B1), an ethylene copolymer (B2), and a modified thermoplastic elastomer (B3)
The method of mixing with the type of resin can be performed by a known method.

In the present invention, if necessary, an elastomer (C) described later or an adhesive resin may be added to the mixed resin for use. Examples of the adhesive resin include an alicyclic saturated hydrocarbon resin and a terpene resin.

In this case, the amount of the elastomer (C) is usually 5 to 50 parts by weight, preferably 5 to 20 parts by weight, and the amount of the tacky resin is usually 0.5 to 100 parts by weight of the mixed resin. To 20 parts by weight, preferably 0.5 to 10 parts by weight. Further, additives such as a coloring agent, a heat stabilizer, a lubricant, and a nucleating agent other than the above-mentioned additive resin can be blended within a range not to impair the object of the present invention.

As a method for producing the nonwoven fabric according to the present invention, a known method can be employed, and any of a dry method, a wet method, a spun bond method, a melt blow method and the like may be used. The spun bond method is preferred in that the above-mentioned is obtained. In the present invention, an embodiment in which the nonwoven fabric is a spunbonded nonwoven fabric is one of the preferred embodiments of the present invention.

In the present invention, an extensible nonwoven fabric is preferred as the nonwoven fabric. An extensible nonwoven fabric has an elongation ratio of at least one direction in the vertical or horizontal direction of 100% or more, preferably 150% or more.
% Or more. As a preferred method for producing an extensible nonwoven fabric, a method in which a nonwoven fabric produced by a spunbond method is stretched in the machine direction at a temperature 20 to 40 ° C. lower than the melting point of the resin is used. Thereby, a large degree of elongation in the lateral direction can be obtained. Note that the vertical direction is a direction (MD) parallel to the web flow direction at the time of forming the nonwoven fabric, and the horizontal direction is a direction (CD) perpendicular to the web flow direction.

In the present invention, nonwoven fabrics composed of the above-mentioned polyolefin (A) monocomponent fibers (in this case, the entire fibers are formed from the above-mentioned mixed resin), and concentric or non-woven fabrics are preferably used as the nonwoven fabrics. The nonwoven fabric is made of a composite fiber such as an eccentric core-sheath type or side-by-side type (in this case, a resin forming at least all or a part of the surface of the fiber is formed from the mixed resin). The bicomponent fiber in the conjugate fiber is a fiber composed of one resin and another resin having different properties from the resin, and is composed of a sheath made of one resin and a core made of another resin. A core-in-sheath type bi-component fiber and a side-by-side type bi-component fiber composed of two resin parts, one resin part and another resin part, are exemplified. In the present invention, an embodiment in which the nonwoven fabric is a core-sheath type or side-by-side type bicomponent fiber is a preferred embodiment of the present invention.

The core-sheath type conjugate fiber may be a concentric conjugate fiber in which a circular core portion is surrounded by a donut-shaped sheath portion having the same center in the cross section of the fiber, or the core portion and the sheath portion may be wrapped around each other. An eccentric composite fiber whose centers do not coincide may be used. Also,
The core may be an eccentric core-sheath type composite fiber whose core part is partially exposed on the fiber surface. Among these, an eccentric core-sheath type crimped conjugate fiber having excellent extensibility is preferable.

The sheath of the core-sheath type composite fiber is formed of the above-mentioned mixed resin. The polyolefin (A) in the mixed resin can be appropriately selected from the above-mentioned polyolefins, but is preferably an ethylene polymer in view of the feeling of the nonwoven fabric. As the ethylene polymer used in the present invention, a homopolymer of ethylene, or ethylene, propylene, 1-butene, 1-
Α- such as hexene, 4-methyl-1-pentene and 1-octene
Copolymers with olefins may be mentioned.

The core of the core-sheath type composite fiber may be formed of the above-mentioned mixed resin, but is preferably formed of a polyolefin, and more preferably a propylene polymer. As the propylene polymer, a homopolymer of propylene or propylene and other α such as ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene
-Copolymers with olefins. Among these, a propylene / ethylene random copolymer comprising propylene and a small amount of ethylene and containing a structural unit derived from ethylene in an amount of 5 mol% or less is particularly preferred.
When this copolymer is used, a nonwoven fabric having good spinnability, excellent productivity of composite fibers, good flexibility, and excellent touch feeling can be obtained.

The resin forming the core of the core-sheath composite fiber is a melt flow rate (according to ASTM D1238, temperature: 230 ° C., load: 2.16 kg, measured value;
When the propylene polymer is 0.5 to 100 g / 10 min (referred to as MFRa), the resin forming the sheath portion may be a melt flow rate (based on ASTM D1238, temperature:
A mixed resin containing a propylene polymer having a melt flow rate of MFRa / MFRb ≧
A combination of a propylene polymer and a mixed resin containing a propylene polymer satisfying the relationship of 1.2 or MFRa / MFRb ≦ 0.8 is preferable. The difference in the melt flow rates makes it easier to obtain crimped conjugate fibers having excellent extensibility.

The weight ratio of the resin of the sheath to the resin of the core (sheath / core) of the core-sheath type conjugate fiber is preferably in the range of 2/8 to 8/2. Further, the fineness of the core-sheath type composite fiber is usually 4d or less, and is preferably 3d or less from the viewpoint that a nonwoven fabric having more excellent flexibility can be obtained.

The side-by-side type conjugate fiber is composed of one resin part and another resin part having different properties. The resins forming the side-by-side type composite fiber are the same as the resin forming the sheath forming the core-sheath type composite fiber and the resin forming the core, respectively.

The weight ratio of each resin part of the side-by-side type conjugate fiber is preferably in the range of 2/8 to 8/2, and in particular, 3/7 to 7 in that crimped conjugate fiber is easily obtained.
/ 3 is preferable. The fineness of the side-by-side type conjugate fiber is usually 4d or less, and is preferably 3d or less from the viewpoint that a nonwoven fabric having more excellent flexibility can be obtained.

The non-woven fabric of the present invention is preferably a non-woven fabric comprising the above-mentioned core-sheath type or side-by-side type conjugate fiber, and is produced by, for example, a spun bond method.
That is, the resin constituting the core portion of the core-sheath type composite fiber and the resin constituting the sheath portion are separately melted by an extruder or the like, respectively, and each melt is formed into a desired core-sheath structure and discharged. By discharging from a spinneret having a composite spinning nozzle configured as described above, a core-sheath type composite fiber is spun. The spun conjugate fiber is cooled by a cooling fluid, and tension is further applied to the conjugate fiber by drawing air to a predetermined fineness. The conjugate fiber is collected as it is on a collection belt and deposited to a predetermined thickness to form the conjugate fiber. Get the web. As a result, a high-strength nonwoven fabric can be obtained, and a nonwoven fabric made of a crimped conjugate fiber having extensibility can be obtained by using an eccentric core-sheath type.

Next, the fibers are prepared by entanglement of the fibers by hot embossing using an embossing roll. The embossed area ratio (engraved area ratio: the ratio of the thermocompression-bonded portion in the nonwoven fabric) in the hot embossing can be appropriately determined according to the application. Usually, the emboss area ratio is 5
When the content is in the range of ４０40%, a nonwoven fabric having excellent balance of flexibility, air permeability and friction fastness can be obtained.

If a composite spinning nozzle for a side-by-side composite fiber is used instead of the composite spinning nozzle for a core-sheath composite fiber, a nonwoven fabric made of the side-by-side composite fiber according to the present invention can be obtained. This allows
A high-strength nonwoven fabric can be obtained, and a nonwoven fabric made of extensible crimped conjugate fibers can be obtained.

The nonwoven fabric according to the present invention usually has a basis weight of 50
g / m ² or less, preferably 5 to 50 g / m ^2, more preferably 5 to 30 g / m ² of non-woven fabric are suitable for applications requiring flexibility, in response to application 50 g / m ^Two
Nonwoven fabric having a higher basis weight than that of the nonwoven fabric.

Film / Nonwoven Composite The film / nonwoven composite according to the present invention is a composite of a nonwoven fabric and a thermoplastic resin film as described above. As the thermoplastic resin film, a film formed using a resin selected from polyolefin, polyester, and polyamide is preferable.

Examples of the polyolefin include those similar to those exemplified as the polyolefin (A). Examples of the polyester include aromatic polyesters such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, polycaprolactone, and polyhydroxybutyrate.

As the polyamide, nylon-6, nylon-66, nylon-10, nylon-12, nylon-
And aliphatic polyamides produced from aromatic dicarboxylic acids and aliphatic diamines.

In a preferred film / nonwoven fabric composite for a sanitary material or the like, a resin film is formed using a moisture-permeable elastomer (C). An elastomer is a polymer substance and an elastic material. Among them, a thermoplastic elastomer is preferable from the viewpoint of moldability. At room temperature, thermoplastic elastomers have the same elastic properties as vulcanized rubber (depending on the soft segment in the molecule), and at high temperatures, they can be molded using existing molding machines as they are with ordinary thermoplastic resins. A possible polymeric material (due to the hard segments in the molecule). In the present invention, a film-nonwoven fabric composite formed by molding a thermoplastic resin film using an elastomer (C) having moisture permeability is one of preferred embodiments of the present invention.

As the moisture-permeable elastomer (C) used in the film / nonwoven fabric composite of the present invention, various elastomers can be used as long as they are moisture-permeable. In order to confirm that it has moisture permeability, for example, it can be determined that the material has moisture permeability when the permeability of water vapor is recognized by a measuring method according to the cup method of JIS Z0208. Preferably, the JI
According to the cup method of SZ0208, a film having a thickness of 30 μm is 2,000 g / m ² · day or more, preferably 300
Those showing a water vapor transmission rate of 0 g / m ² · day or more are preferably used in the present invention.

Suitable examples of the moisture-permeable thermoplastic elastomer include urethane-based elastomers, polyester-based elastomers, and polyamide-based elastomers.

Thermoplastic urethane elastomers include a polyurethane obtained by the reaction of a short-chain polyol (molecular weight 60 to 600) and diisocyanate as a hard segment, and a long-chain polyol (molecular weight 600 to 4000) as a soft segment. A block copolymer with polyurethane obtained by the reaction of diisocyanate is exemplified. Examples of the diisocyanate include toluene diisocyanate and diphenylmethane diisocyanate, and examples of the short-chain polyol include ethylene glycol, 1,3-propylene glycol, and bisphenol A.

As the urethane-based thermoplastic elastomer, a polylactone ester polyol such as polycaprolactone glycol and the addition polymerization of diisocyanate in the presence of a short-chain polyol (polyether polyurethane); poly (ethylene-1,4-adipate) A) adipate ester polyols such as glycols and poly (butylene-1,4-adipate) glycols and addition polymerization of diisocyanate in the presence of short-chain polyols (polyester polyurethane); polytetrafluorofuran obtained by ring-opening of tetrahydrofuran Examples thereof include those obtained by addition-polymerizing diisocyanate to methylene glycol in the presence of a short-chain polyol. Commercially available products include Vulcolan (manufactured by Bayer), Chemigum SL (manufactured by Goodyear), Adiprene (manufactured by DuPont), and Valcaprene (manufactured by ICI) [all trade names]
And the like.

As the polyester-based elastomer, a structural unit represented by the following formula (I) derived from an aromatic polyester is used as a hard segment, and a structural unit represented by the following formula (II) derived from an aliphatic polyether is used as a hard segment. Block copolymers in which they are made into soft segments and they are block copolymerized are exemplified.

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In the above formula, D is a divalent residue obtained by removing two hydroxyl groups from a diol having a molecular weight of about 250 or less, and R is a divalent residue of a dicarboxylic acid having a molecular weight of about 300 or less.
G is a divalent residue obtained by removing two hydroxyl groups from poly (alkylene oxide) glycol having an average molecular weight of about 400 to about 3,500. Where the formula is a copolyetherester of poly (alkylene oxide) glycol
The amount of ethylene oxide groups inserted into the structural unit represented by (II) is about 25 to 68% by weight based on the total weight of the copolyetherester. In the present invention, it is particularly preferable that the aromatic polyester is tetramethylene terephthalate and the aliphatic polyether is alkylene ether terephthalate. Specific examples include a polybutylene terephthalate / polytetramethylene ether glycol block copolymer. As a commercially available product, Hytrel (registered trademark, manufactured by DuPont) can be mentioned.

Examples of the polyamide-based elastomer include a multi-block copolymer using a polyamide as a hard segment and a polyester or polyol diol having a low glass transition temperature as a soft segment.
Here, as the polyamide component, nylon-6, -6
6, -610, -11, -12 and the like. Of these, nylon-6 and nylon-12 are preferred. Examples of the polyether diol include poly (oxytetramethylene) glycol and poly (oxypropylene) glycol.
(Ethylene-1,4-adipate) glycol, poly (butylene)
-1,4-adipate) glycol, polytetramethylene glycol and the like. As a specific example, nylon 12
/ Polytetramethylene glycol block copolymer. Examples of commercially available products include diamide (manufactured by Daicel Huls), PEBAX (manufactured by Atochem) (both are trade names).

Of these, urethane-based elastomers and polyester-based elastomers are preferred in terms of excellent moisture permeability, and particularly preferred are urethane-based elastomers having elasticity.

In the present invention, if necessary,
Coloring agents, heat stabilizers, lubricants, nucleating agents, and inorganic fillers (eg, calcium carbonate, talc, clay, barium sulfate, etc.) may be added to the resin material forming the film of the film / nonwoven fabric composite within a range that does not impair the object of the present invention. ) And other polymers. In particular, a modified polyolefin (B1) modified with an unsaturated carboxylic acid or a derivative thereof, an ethylene copolymer (B2) containing a comonomer unit having a polar group, and a polyolefin (B2) added to the polyolefin (A) forming the nonwoven fabric, and It is preferable that a resin selected from a modified thermoplastic elastomer (B3) obtained by modifying a thermoplastic elastomer with an unsaturated carboxylic acid or a derivative thereof is further added because the interlayer adhesion of the film / nonwoven fabric composite is further improved.

The film / nonwoven fabric composite according to the present invention comprises:
The nonwoven fabric and the thermoplastic resin film as described above are compositely integrated, and the structure of the composite may be a single-layer film / nonwoven fabric, a multi-layer film / nonwoven fabric / film or It may be a nonwoven fabric / film / nonwoven fabric. If the film is 2
It may be a laminated film having more than one layer. In the preferred film / nonwoven fabric composite of the present invention, the interlayer adhesive strength between the film and the nonwoven fabric is 50 g / 25 mm or more, more preferably 80 g / 25 mm.
g / 25 mm or more, more preferably 100 g / 25 mm or more.

When an elastomer having moisture permeability is used for the resin film, the moisture permeability is preferably 2000 g / m 2.
² day or more, more preferably 3000 g / m ² day or more, and a water pressure resistance of 1000 mmAq or more, more preferably 15 g / m ² day or more.
It is more than 00 mmAq. Within this range, a film / nonwoven fabric composite having water resistance and moisture permeability suitable for a backsheet of a sanitary material such as a disposable diaper can be obtained. At this time, the average diameter of the filaments constituting the nonwoven fabric is 5 to 3
0 μm, and the basis weight is 5 to 50 g / m 2.
It is preferably ² .

As a method of laminating the nonwoven fabric and the thermoplastic resin film of the present invention to form a composite and integrated, a method of forming a nonwoven fabric and a film in advance, laminating the nonwoven fabric and the film, and pressing the nonwoven fabric with an embossing roll or the like (thermocompression). An embossing method) or a method of fusing by ultrasonic heating (ultrasonic lamination method) can be adopted, but a simpler method is a method by extrusion lamination.

In the extrusion lamination, a resin film can be laminated on a preformed nonwoven fabric at the same time as molding, so that the interlayer adhesion strength is improved and the film thickness can be reduced. For this reason, when an elastomer having moisture permeability is used as the film, high moisture permeability can be obtained. According to the extrusion lamination method, the laminating step using a hot-melt adhesive, which is conventionally performed, is eliminated, and the processing step is simplified, so that the cost can be reduced. In the present invention, a film / nonwoven fabric composite that is compositely integrated by extrusion lamination is one of preferred embodiments of the present invention.

An example of a method using extrusion lamination will be described. A thermoplastic resin, preferably a moisture-permeable elastomer (C) material, is supplied to an extruder, and the molten resin melted by the extruder is guided to a film die to form a film. On the other hand, a polyolefin (A), a modified polyolefin (B1) modified with an unsaturated carboxylic acid or a derivative thereof, an ethylene-based copolymer (B2) containing a comonomer unit having a polar group, and a thermoplastic elastomer containing an unsaturated carboxylic acid Alternatively, using a mixed resin containing at least one kind of resin selected from a thermoplastic elastomer modified product (B3) modified with a derivative thereof, a non-woven fabric produced in advance by, for example, a spun bond method was subjected to a stretching treatment as necessary. The nonwoven fabric is guided between the nip roll and the chill roll from the payout roll. in the meantime,
Corona discharge treatment can be performed on the nonwoven fabric to modify the surface for improving the adhesiveness. The nip roll may be a flat roll or an emboss roll. In the case of an embossing roll, the embossing area ratio is determined according to the required interlayer adhesion strength, and is usually 5 to 30%.

The elastomer (C) film extruded from the film die is also guided between the nip roll and the chill roll before it is cooled and solidified, passed through the roll together with the nonwoven fabric, and adhered under pressure. At the same time, the film is cooled and solidified by the chill roll, and the bonded film / nonwoven fabric composite is taken up by a take-up roll. 2 resin films
When a coextruded film having more than one layer is formed, a multilayer film is formed using two or more extruders and a die for a multilayer film, and extrusion lamination is performed in the same manner as described above.

In the production of this film / nonwoven fabric composite, if the elastomer (C) film has tackiness, blocking may occur on the cooling chill roll. As a method of preventing blocking on the chill roll, it has been proposed to separately provide a release layer (for example, JP-A-58-69049). However, this method not only increases the cost, but also discharges unnecessary waste. There are problems such as being done.

The present inventors recommend a method of preventing blocking by applying a non-stick coating to the chill roll. Examples of the non-adhesive coating applied to the chill roll surface include a method of coating with a fluororesin such as polytetrafluoroethylene (PTFE) or another synthetic resin, and a method of spray-coating a ceramic.

As a resin for coating with a synthetic resin, polytetrafluoroethylene (PTFE) is preferable. A filler such as ceramic may be mixed with the synthetic resin for coating. Mixing the ceramic improves the wear resistance of the coating.
The thickness of the coating is preferably 30 to 50 μm.

In the method of spray coating the ceramic, the ceramic can be appropriately selected, but WC, Cr ₂ C _{3 and the} like are preferable. Of these, WC is preferred. The thickness of the thermal spray coating is preferably 100 to 200 μm, and the surface roughness (Ra) is preferably 1 to 10 μm.

It is one of the preferred embodiments of the non-adhesive coating to further apply the above-mentioned synthetic resin coating or silicon coating to the chill roll on which the ceramic has been spray-coated, since the abrasion resistance is improved.
Polytetrafluoroethylene (PTFE) can be used as a preferred synthetic resin, and silicone rubber can be used as silicon.

In the present invention, the basis weight of the film of the elastomer (C) is selected according to the required strength according to the application. For example, in the case of a back sheet used for a disposable diaper or the like, 5 to 30 g / m ² , Is 8-15g
/ M ² . If the basis weight of the elastomer film is too large, the moisture permeability becomes insufficient. On the other hand, if the basis weight is too small, the strength becomes low, which may cause a problem in use.

The interlayer adhesive strength of the elastomer film / nonwoven fabric composite obtained as described above is preferably 50
g / 25 mm or more, more preferably 80 g / 25 mm or more, water vapor permeability of 2000 g / m ² · day or more, and water pressure resistance of 1000 mmAq or more, preferably 1500 mmAq or more. This composite has excellent moisture permeability and water resistance,
Since the interlayer adhesive strength is large, it can be suitably used for medical materials, sanitary materials, industrial materials, and the like. Specific examples of applications include protective covers, packaging materials, puppet materials, outerwear, underwear, sanitary products, disposable diapers, roofing materials, wallpaper, and the like.

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EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
The interlayer adhesion strength, moisture permeability, and water pressure resistance of the film / nonwoven fabric composites obtained in Examples and Comparative Examples were measured by the following methods.

(1) Interlaminar Adhesive Strength A film / nonwoven fabric composite cut into a strip having a width of 25 mm is partially peeled in advance in a longitudinal direction from each end into each layer.
The peeled both ends were tested with a testing machine (Model 2005 made by Isotesco).
Mold) so that the distance between the chucks is 50 mm to form a T-shape (180 degree peeling), and a peeling speed of 100 m.
After peeling at m / min, the adhesive strength between the film and the nonwoven fabric layer was determined.

(2) Moisture permeability The moisture permeability was measured according to the cup method of JIS Z0208. Temperature 4
From an atmosphere of 0 ° C. and a relative humidity of 90%, a moisture permeable area of 25 cm
The mass of water vapor that permeated for 30 minutes through ^two or more samples was measured and converted to 1 m ^{2 of} sample for 24 hours. The atmosphere on the water vapor permeable side was dried with a moisture absorbent.

(3) Water-proof pressure The water-proof pressure was measured according to JIS L1072A method (low water pressure method).
Four test pieces of about 15 × 15 cm were sampled at a time and mounted on a water resistance tester (manufactured by Tester Sangyo Co., Ltd.) so that the surface of the test piece was exposed to water. The test piece was raised at a rate of ± 3 cm / min, and water pressure was applied to the test piece. The water level when water leaked from three places on the opposite side of the test piece was measured, and the water pressure resistance was determined from the pressure at that time.

Example 1 A propylene / ethylene random copolymer (MFR (according to ASTM D1238, 230 ° C., load: 2.16 kg)
30 g / 10 min, ethylene component content: 4 mol%) and polyethylene (MFR (190 ° C. according to ASTM D1238)
(Measured under a load of 2.16 kg): 30 g / 10 min, density: 0.930
g / cm ³ ) and maleic acid-modified polyethylene (MFR (measured according to ASTM D1238 at 190 ° C. under a load of 2.16 kg)):
15 g / 10 min, density: 0.920 g / cm ³ , modification rate 1
Composite melt spinning is performed by a spunbond method using 30 parts by weight of a mixed resin and a core is a propylene / ethylene random copolymer, and a sheath is a mixed resin of polyethylene and modified polyethylene (core: sheath). (Weight ratio of 1: 4), a spunbonded nonwoven fabric (a) having an average fiber diameter of 18 µm and a basis weight of 20 g / m ² was produced.

Next, a polyester-based thermoplastic elastomer (Hytrel ^™ HTR3548L manufactured by DuPont) was extruded (extruder molding temperature pattern 200 ° C./240° C./2).
30 ° C.), and a film having a thickness of 10 μm was formed using a film die (temperature: 220 ° C.). On the other hand, the nonwoven fabric obtained above is fed at 30 m / min, subjected to corona discharge treatment at 30 W / m ² , and then nip roll (flat roll),
The mixture was guided between chill rolls (obtained by baking and coating tetrafluoroethylene to a thickness of 40 μm), and laminated with the extruded elastomer film to produce a film / nonwoven fabric composite. The roll conditions are a temperature of 40 ° C. and a speed of 30 m / min. Table 1 shows the results of the evaluation.

Example 2 70 parts by weight of the propylene / ethylene random copolymer used in Example 1 and modified polypropylene (MFR (measured by ASTM D1238 at 230 ° C. under a load of 2.16 kg): 35 g / 10 min, density: Melt spinning by a spun bond method using a mixed resin of 0.91 g / cm ³ , an ethylene component content of 4 mol%, a modification ratio of 1% by weight) and 30 parts by weight, and an average fiber composed of monocomponent fibers A spunbond nonwoven fabric (b) having a diameter of 18 μm and a basis weight of 20 g / m ² was produced. Next, a film and a nonwoven fabric composite were manufactured by laminating with a polyester-based thermoplastic elastomer film in the same manner as in Example 1. Table 1 shows the results of the evaluation.

(Comparative Example) Density of 0.90 g / cm ³ , M
FR (measured by ASTM D1238 at 230 ° C with a load of 2.16 kg) is 50
g / 10 minutes, a propylene / ethylene random copolymer having an ethylene content of 4.7 mol%, and a density of 0.948.
g / cm ³ , MFR (190 ° C load 2.16 kg according to ASTM D1238)
30 g / 10 min, and the 1-butene component content was 4.
Using 0 mol% of an ethylene / 1-butene random copolymer, composite melt spinning is performed by a spun bond method, and the core is a polypropylene copolymer and the sheath is an ethylene / 1-butene random copolymer (core) : Made of concentric core-sheath type bicomponent fibers having a weight ratio of the sheath portion of 1: 4), and an average fiber diameter of 2
0 μm, spunbond nonwoven fabric with a basis weight of 18 g / m ² (c)
Was manufactured.

Then, in the same manner as in Example 1, the thickness of 12.
A 5 μm polyester thermoplastic elastomer film was formed. On the other hand, the nonwoven fabric (c) obtained above was laminated with an elastomer film in the same manner as in Example 1 to produce a film / nonwoven fabric composite. Table 1 shows the results of the evaluation.

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[Table 1]

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The nonwoven fabric for extruded lamination according to the present invention is excellent in adhesiveness to a film, and can provide a film / nonwoven fabric composite having high interlayer adhesion strength by extruded lamination. The film / nonwoven fabric composite according to the present invention has a high interlayer adhesion strength between the film and the nonwoven fabric, and in particular, a film using an elastomer having moisture permeability,
The composite is excellent in moisture permeability and water resistance and excellent in strength and texture and suitable for sanitary materials. Since this film / nonwoven fabric composite can be obtained only by extrusion lamination, the manufacturing process is simplified and economical.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 23/26 C08L 23/26 101/00 101/00 D04H 3/16 D04H 3/16 D06M 15/227 D06M 15/227 15/564 15/564 (72) Inventor Kenichi Suzuki 1 Asahi-cho, Yokkaichi-shi, Mie Prefecture F-term in Mitsui Chemicals Co., Ltd. AL05A AL07A AL09A AL09B BA02 DG15A EH17 EH172 EH23 EH232 EJ10A EJ50 EJ502 EJ55 EJ552 GB66 GB72 JB07 JB16A JB16B JC00 JD02 JD04B JK01 YY00A YY00B 4J002 BB00 BB031 BB051 BB053 BB063 BB073 BB083 BB121 BB141 BB151 BB171 BB202 BB212 BC024 BD063 BP021 CF004 CF174 CK024 CL004 GB01 4L033 AB02 AB07 AC07 AC15 CA12 CA45 CA50 CA55 CA70 4L047 AA14 AA27 BA08 CA06 CB10 CC03

Claims (13)

[Claims] 1. A polyolefin (A), [B] a modified polyolefin (B1) modified with an unsaturated carboxylic acid or a derivative thereof, an ethylene copolymer (B2) containing a comonomer unit having a polar group, A mixed resin containing at least one selected from a thermoplastic elastomer modified product (B3) obtained by modifying a thermoplastic elastomer with an unsaturated carboxylic acid or a derivative thereof, at least all or a part of at least an outer surface of a filament constituting a nonwoven fabric A nonwoven fabric for extrusion lamination, comprising: 2. The content of a unit derived from an unsaturated carboxylic acid or a derivative thereof in the mixed resin is 0.01 to 5%.
2. The nonwoven fabric for extrusion lamination according to claim 1, wherein the content of the comonomer unit having a polar group in the mixed resin is 10 to 50% by weight. 3. The nonwoven fabric for extrusion lamination according to claim 1, wherein the nonwoven fabric is a spunbond nonwoven fabric. 4. The nonwoven fabric for extrusion lamination according to claim 1, wherein the filament is a concentric or eccentric core-sheath or side-by-side bicomponent fiber. 5. The ethylene-based polymer (B2) containing a comonomer unit having a polar group is an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer, an ethylene-methacrylic acid copolymer, or an ethylene-based copolymer. The nonwoven fabric for extrusion lamination according to any one of claims 1 to 4, wherein the nonwoven fabric is an ethylene polymer selected from an ionomer resin and a resin obtained by modifying an ethylene / ethyl acrylate copolymer with an unsaturated carboxylic acid or a derivative thereof. 6. The modified thermoplastic elastomer (B3)
The nonwoven fabric for extrusion lamination according to any one of claims 1 to 5, wherein the base polymer is a thermoplastic elastomer selected from urethane-based elastomers, styrene-based elastomers, polyester-based elastomers, olefin-based elastomers, and polyamide-based elastomers. 7. A film / nonwoven fabric composite, wherein the nonwoven fabric according to claim 1 and a thermoplastic resin film are integrally combined. 8. The film / nonwoven fabric composite according to claim 7, wherein the thermoplastic resin film is formed using an elastomer (C) having moisture permeability. 9. The moisture-permeable elastomer is a urethane-based elastomer, a polyester-based elastomer,
The film / nonwoven fabric composite according to claim 8, which is a thermoplastic elastomer selected from polyamide-based elastomers. 10. The film / nonwoven fabric composite according to claim 9, which has a moisture permeability of 2000 g / m ² · day or more and a water pressure resistance of 1000 mmAq or more. 11. The filament constituting the nonwoven fabric has an average diameter of 5 to 30 μm, and the basis weight of the nonwoven fabric is 5 to 5 μm.
0 g / m ² , and the basis weight of the film is 5 to 30 g / m ^2.
Film nonwoven composite according to claim 10 is m ^2. 12. The film / nonwoven fabric composite according to claim 6, wherein the interlayer adhesive strength between the film and the nonwoven fabric is 50 g / 25 mm or more. 13. The film / nonwoven fabric composite according to claim 6, wherein the composite is integrated by extrusion lamination.