JP2002315607A - Female material of hook and loop fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost female material of a hook and loop fastener to be manufactured by a simple process. SOLUTION: In the female material of the hook and loop fastener, thermally bonded dry type non-woven fabrics with a large number of loops to be engaged with a male material of the hook and loop fastener are layered on one side of the air-permeable base material sheet made of a thermoplastic resin, and the base material sheet and the non-woven fabrics are partly ultrasonic welded. The large number of loops are held on one side of the air-permeable base material sheet. Preferably, the thermally bonded dry type non-woven fabrics are made of complex fibers consisting of a high fusible component part and a low fusible component part, and the base material sheet is preferably a non-woven fabric or moisture permeable film made of thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar fastener female member. More specifically, the present invention relates to a planar fastener female material suitable for a sanitary material such as a disposable diaper.

[0002]

BACKGROUND OF THE INVENTION A planar fastener is usually composed of a female member having a loop formed on a surface thereof, and a male member having a hook portion such as a hook for engaging with the female member. Because this planar fastener can be used easily, clothing, shoes,
Widely used for opening and closing parts of bags, daily necessities, etc. Recently, in order to wear and fix the disposable diaper, a disposable diaper having a planar fastener attached to a waist portion of the diaper has been put to practical use.

[0003] By the way, the conventional planar fastener female material used for such disposable diapers is a female material in which a complete loop is formed on the surface of a woven, knitted or tricot fabric made of polyester, polyamide or polypropylene. It is. These planar fastener female materials can be used semi-permanently depending on the material and the processing method, but are very expensive, thick, and hard. These planar fasteners also have a poor tactile feel due to their lack of flexibility.

Japanese Patent Application Laid-Open No. 11-290103 discloses a thermoplastic resin nonwoven fabric in which a loop pile is formed on one surface. The loop pile is made of a polyethylene terephthalate fiber or a polyamide fiber formed on a thermoplastic resin nonwoven fabric. The pile yarn is formed by knitting, and the pile yarn is fixed by applying and curing a hot melt type adhesive on the surface opposite to the surface of the nonwoven fabric on which the loop pile is formed, or by heat setting. A planar fastener female material is disclosed. This planar fastener female material is suitable for disposable products such as disposable diapers, and is thinner and more flexible than a conventional planar fastener female material. Without, it is inexpensive.

[0005] However, recently, there has been a demand for a lower-cost, high-productivity sheet-like fastener female material.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost planar fastener female material which can be prepared by a simple process.

[0007]

That is, the female sheet fastener according to the present invention has a large number of loops engageable with the male sheet fastener on one side of a breathable base sheet made of a thermoplastic resin. A thermal bond dry nonwoven fabric is laminated by partial ultrasonic fusion, and the plurality of loops are held on one surface of the air-permeable base sheet.

[0008] The thermally bonded dry nonwoven fabric, it is preferred basis weight is of the 15~70g / ^{m 2.} Such a thermal bond dry nonwoven fabric is also preferably
It is composed of a conjugate fiber composed of a high-melting component part and a low-melting component part forming at least a part of the fiber surface, and has a loop formed by heat fusion by a thermal bonding method. Further, as the composite fiber constituting the above-mentioned thermal bond nonwoven fabric, it is preferable that the high melting component is polyethylene and the low melting component is selected from polyethylene terephthalate and polypropylene.

The ultrasonic bonding of the base sheet and the thermally bonded nonwoven fabric is preferably performed so that the bonded area ratio is 10% or less.

In the present invention, the base sheet is preferably a nonwoven fabric or a moisture-permeable film made of a thermoplastic resin.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a female sheet fastener according to the present invention will be specifically described. The planar fastener female material according to the present invention is obtained by laminating a thermal bond dry nonwoven fabric having a large number of loops capable of engaging with the planar fastener male material on one surface of a breathable substrate sheet made of a thermoplastic resin. The sheet and the nonwoven fabric are partially ultrasonically fused, and the plurality of loops are held on one side of the air-permeable base sheet.

As the air-permeable base sheet made of a thermoplastic resin used in the present invention, a woven fabric, a knitted fabric, a nonwoven fabric, a mesh, a moisture-permeable film, and the like can be used. A nonwoven fabric or a moisture-permeable film made of a thermoplastic resin is preferable from the viewpoint of giving a comfortable touch.

Non-woven fabric made of thermoplastic resin Non-woven fabric made of thermoplastic resin which can be used as a base sheet includes, for example, non-woven fabric made of polyester resin, polyolefin resin, polyamide resin and the like. The basis weight of the thermoplastic resin non-woven fabric used for the base sheet depends on the type of the non-woven fabric, but is usually 10 to 75 g.
/ M ² , preferably 15 to 40 g / m ² . If the basis weight is too small, it is not preferable because the hot melt adhesive or the like is apt to seep out when attaching the planar fastener female material.

The thermoplastic resin non-woven fabric preferably used as the base sheet is, for example, a fiber (1) made of polyethylene terephthalate (PET-i) and has a basis weight of 10 to 75 g / m ² , preferably 15 to 40 g / m ² . m
Nonwoven is ^2; as a composite fiber consisting of high melt component part and low melt component part, polyethylene (PE-i) sheath and core-sheath type composite fibers consisting of a core portion made of polyethylene terephthalate consisting of (2 ), Wherein the nonwoven fabric has a basis weight of 10 to 75 g / m ² , preferably 15 to 40 g / m ² ; or a highly fusible component made of polyethylene (PE-i) and polyethylene terephthalate (PET-i).
A side-by-side type composite fiber (3) composed of a low-melting component part consisting of (ii), having a basis weight of 10 to 75 g.
/ M ² , preferably 15 to 40 g / m ² .

Further, a non-woven fabric comprising a fiber (4) made of polypropylene (PP-i) and having a basis weight of 10 to 75 g / m ² , preferably 15 to 40 g / m ² ; Polypropylene (PP-ii) having a melt flow rate (ASTM D1238; 230 ° C, load 2.16 kg) of 10 to 40 g / 10 min as a composite fiber composed of component parts
And a melt flow rate (ASTM) smaller than that of the polypropylene (PP-ii).
D1238: polypropylene (PP) having a temperature of 230 ° C. and a load of 2.16 kg, and having a melt flow rate of 5 to 20 g / 10 min.
A core-sheath composite yarn composed of a core portion consisting -iii) (5), a nonwoven fabric basis weight is 10~75g / m ^2; the high melt component part made of the polypropylene (PP-ii) and a the polypropylene (PP-iii) side-by-side type composite fiber composed of low melt component unit consisting of (6), the nonwoven basis weight is 10~75g / m ^2; sheath made of polyethylene (PE-ii) Core-sheath type composite fiber (7) composed of a core and a core made of polypropylene (PP-iv), the nonwoven fabric having a basis weight of 10 to 75 g / m ² ; or the polyethylene (PE-ii) A non-woven fabric having a basis weight of 10 to 75 g / m ^2, which is a side-by-side type composite fiber (8) composed of a high-melting component part and a low-melting component part made of the polypropylene (PP-iv). Can be

As the substrate sheet, a dry nonwoven fabric is preferable to a wet nonwoven fabric, and a spunbond nonwoven fabric is particularly preferable in terms of productivity. In addition, a laminated body of a spunbonded nonwoven fabric and a meltblown nonwoven fabric is preferable in that the hotmelt adhesive can be easily prevented from bleeding out during bonding. The preferred basis weight in that case is preferably 17 g in the whole laminate.
/ M ² or less, more preferably 13 to 15 g / m
² .

In the present invention, the term “high melting property” means that a polymer resin composed of the same series of monomers has a high melt flow rate, and that a polymer composed of different series of monomers has a high melt flow rate. , Meaning that the melting point is low, the difference in melting point is preferably 15 ° C or more, more preferably 20 ° C or more,
More preferably, it means lower by 25 ° C. or more.

The strength of the fibers constituting the thermoplastic resin non-woven fabric used as the base sheet is 2 to 1 in terms of tensile strength.
It is desirably 2 g / d (denier), preferably 4 to 7 g / d (denier).

Fiber (1) Polyethylene terephthalate (PET-i) forming the fiber (1) has a melting point (ASTM D792) of 255 to 26.
At 0 ° C., the density (ASTM D1505) is 1.38 to 1.40 g
/ Cm ^{3 in} the range of normal spinning grade. The thickness of the fiber (1) is 0.5 to
Desirably, it is 5.0d (denier).

The above polyethylene terephthalate (PET-
In i), other polymers, coloring materials, heat stabilizers, nucleating agents, slip agents and the like can be blended, if necessary, as long as the object of the present invention is not impaired.

Core-sheath type composite fiber (2) and side viser
The polyethylene (PE-i) to form a sheath portion of the id-type composite fiber (3) the core-sheath composite yarn (2), a homopolymer of ethylene (Procedure low pressure method may be either a high pressure method), Or with ethylene,
Examples include random copolymers with α-olefins such as propylene, 1-butene, 1-hexene, 4-methyl-1-pentene and 1-octene.

Polyethylene (PE-i) has a density (ASTM D15
05) is in the range of 0.920 to 0.970 g / cm ³ , preferably 0.940 to 0.950 g / cm ³ from the viewpoint of spinnability, and the melt flow rate (ASTM D
1238, 190 ° C, load 2.16 kg) is 20-60 g / 10 minutes,
It is preferably in the range of 25 to 35 g / 10 minutes from the viewpoint of spinnability.

As the polyethylene terephthalate (PET-ii) forming the core of the core-sheath type composite fiber (2), the above-mentioned polyethylene terephthalate (PET-i) can be used. The core-sheath type composite fiber (2) may be concentric or eccentric. FIG. 1 shows a schematic cross-sectional view of a coaxial core-sheath composite fiber. In the present invention, as shown in FIG. 2A, an eccentric core-sheath type composite fiber whose core portion is not exposed on the fiber surface can be used.
As shown in (B), an eccentric core-sheath type composite fiber whose core part is partially exposed on the fiber surface can also be used. In addition, the code | symbol 1 in a figure shows the core part which consists of polyethylene terephthalate, and the code | symbol 2 shows the sheath part which consists of polyethylene.

The side-by-side type composite fiber (3)
Is composed of a high-melting component made of the above-mentioned polyethylene (PE-i) and a low-melting component made of polyethylene terephthalate (PET-ii). FIG. 3 shows a schematic cross-sectional view of the side-by-side type conjugate fiber. In addition, the code | symbol 3 in a figure shows a polyethylene terephthalate part, and the code | symbol 4 shows a polyethylene part.

The weight ratio (PET-ii / PE-i) between polyethylene terephthalate (PET-ii) and polyethylene (PE-i) in these composite fibers (2) and (3) is 5 / 95-4.
0/60, preferably in the range of 10/90 to 25/75 is desirable in terms of bulkiness of the nonwoven fabric.

Further, in the present invention, if necessary, polyethylene (PE-i) and / or polyethylene terephthalate (PET-ii) may be added to other polymers, coloring materials, heat-resistant and stable materials within a range not to impair the object of the present invention. Agents, nucleating agents, slip agents and the like can be added.

Composite fibers (2) and (3) as described above
Is desirably 0.5 to 5.0 d (denier).

Fiber (4) Polypropylene (PP-i) forming fiber (4)
Examples thereof include a homopolymer of propylene or a random copolymer of propylene and an α-olefin such as ethylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and 1-octene.

These propylene / α-olefin random copolymers have an α-olefin component content of 0.5 to 0.5%.
It is desirable to be within the range of 5.0 mol%. Polypropylene (PP-i) has a density (ASTM D1505) of 0.905 to
0.920 g / cm ³ , preferably 0.910 to 0.9
It is desirable from the point of strength that it is in the range of 15 g / cm ³ , and the melt flow rate (ASTM D1238, 230 ° C., load 2.1
6 kg) is 10 to 40 g / 10 min, preferably 20 to 30 g
g / 10 minutes is desirable from the viewpoint of spinnability. The thickness of the fiber (4) as described above is 2.0 to 8.0.
It is desirably d (denier).

Core-sheath type composite fiber (5) and side viser
Id-type conjugate fiber (6) The polypropylene (PP-ii) forming the sheath of the core-sheath conjugate fiber (5) includes propylene homopolymer or propylene, ethylene, 1-butene, 1-hexene, Four-
Examples include random copolymers with α-olefins such as methyl-1-pentene and 1-octene. These propylene / α-olefin random copolymers preferably have an α-olefin component content in the range of 0.5 to 5.0 mol%.

The polypropylene (PP-ii) has a density (ASTM
D1505) is usually in the range of 0.900 to 0.915 g / cm ³ , preferably 0.905 to 0.910 g / cm ³ in terms of strength, and the melt flow rate (AS
TM D1238, 230 ° C, load 2.16kg) 10-40g / 10
Min, preferably in the range of 10 to 20 g / 10 min from the viewpoint of spinnability.

The polypropylene (PP-iii) forming the core of the sheath-core composite fiber (5) may be a homopolymer of propylene or propylene, ethylene, 1-butene, 1-hexene, Examples include random copolymers with α-olefins such as methyl-1-pentene and 1-octene. It is desirable that these propylene / α-olefin random copolymers also have an α-olefin component content in the range of 0.5 to 5.0 mol%.

The polypropylene (PP-iii) has a density (ASTM
D1505) is usually in the range of 0.900 to 0.915 g / cm ³ , preferably 0.905 to 0.910 g / cm ³ in terms of strength, and the melt flow rate (ASTM D1238, 230 ° C., load 2.16kg) is 5-20g / 1
It is desirably 0 minutes, preferably 7 to 9 g / 10 minutes from the viewpoint of spinnability. In the core-sheath composite fiber (5), polypropylene (PP-iii) having a lower melt flow rate than that of polypropylene (PP-ii) is used.

The above-mentioned side-by-side type composite fiber (6)
Is composed of a polymer part made of the above-mentioned polypropylene (PP-ii) and a polymer part made of the polypropylene (PP-iii). Polypropylene (PP-iii) and polypropylene (PP-i) in these composite fibers (5) and (6)
The weight ratio (PP-iii / PP-ii) to i) is 5/95 to 49 /
It is desirably in the range of 51, preferably 5/95 to 25/75, more preferably 10/90 to 20/80, from the viewpoint of the bulkiness of the nonwoven fabric.

Further, in the present invention, if necessary, polypropylene (PP-ii) and / or polypropylene (PP-ii)
In i), other polymers, coloring materials, heat stabilizers, nucleating agents, slip agents and the like can be blended as long as the object of the present invention is not impaired.

The composite fibers (5) and (6) as described above
Is desirably 1.5 to 7.0 d (denier).

Core-sheath type composite fiber (7) and side viser
As the polyethylene (PE-ii) forming the sheath of the core-sheath type composite fiber (8) , a homopolymer of ethylene (the production method may be either a low pressure method or a high pressure method); Or ethylene and propylene, 1-butene, 1-hexene, 4-methyl-1-
Examples include random copolymers with α-olefins such as pentene and 1-octene.

Polyethylene (PE-ii) has a density (ASTM D1
505) is in the range of 0.920 to 0.970 g / cm ³ , preferably 0.940 to 0.950 g / cm ³ , and has a melt flow rate (ASTM D1238, 190 ° C., load 2.1.
6 kg) is 20-60 g / 10 min, preferably 25-35
g / 10 minutes is desirable from the viewpoint of spinnability.

The polypropylene (PP-iv) forming the core of the composite fiber (7) may be propylene homopolymer or propylene, ethylene, 1-butene,
Examples include random copolymers with α-olefins such as 1-hexene, 4-methyl-1-pentene and 1-octene. These propylene / α-olefin random copolymers preferably have an α-olefin component content in the range of 0.5 to 5.0 mol%.

The polypropylene (PP-iv) has a density (ASTM
D1505) is in the range of 0.900 to 0.915 g / cm ³ , preferably 0.905 to 0.910 g / cm ³ from the viewpoint of strength, and the melt flow rate (ASTM D
(1238, 230 ° C, load 2.16 kg) is in the range of 5 to 20 g / 10 min, preferably 7 to 9 g / 10 min, from the viewpoint of spinnability.

Said side-by-side type composite fiber (8)
Is composed of a high-melting component portion made of polyethylene (PE-ii) and a low-melting component portion made of polypropylene (PP-iv). These composite fibers (7),
The weight ratio (PP-iv / PE-ii) between polypropylene (PP-iv) and polyethylene (PE-ii) in (8) is 5/95.
-49/51, preferably 5 / 95-25 / 75, and more preferably 10 / 90-20 / 80 in terms of bulkiness of the nonwoven fabric.

Further, in the present invention, if necessary, polyethylene (PE-ii) and / or polypropylene (PP-iv)
In addition, other polymers, coloring materials, heat stabilizers, nucleating agents, slip agents and the like can be blended as long as the object of the present invention is not impaired.

The composite fibers (7) and (8) as described above
Is desirably 1.5 to 7.0 d (denier).

The non-woven fabric made of polyamide resin is
It is made of a conventionally known polyamide resin fiber, so-called nylon fiber. The thickness of this polyamide (nylon) fiber is
Desirably, it is 0.5 to 5.0 d (denier).

The nonwoven fabric made of a thermoplastic resin which is preferably used as the base sheet is made of the above-mentioned fibers (1) to
(8) Or, it is formed from polyamide fiber.

The non-woven fabric made of these thermoplastic resins is
It can be prepared by a conventionally known nonwoven fabric manufacturing method, that is, a wet method, a dry method, specifically, a tow opening method, a flash spinning method, a spun bond method, a melt blow method, or the like.
Among these production methods, a dry method is preferable, and a spun bond method is particularly preferable in terms of productivity.

The basis weight of the thermoplastic resin non-woven fabric prepared by using the fibers (1) to (8) is preferably 10 to 75 g / m ² , more preferably 10 to 75 g / m ² , from the viewpoint of the stiffness, piercing strength and tear resistance of the non-woven fabric. 15 to 40 g / m ² .

The basis weight of the thermoplastic resin non-woven fabric made of polyamide fiber is preferably 15 to 40 g / m ² from the viewpoint of the stiffness of the non-woven fabric, piercing strength, and resistance to tearing. When a nonwoven fabric made of a thermoplastic resin having a basis weight within the above range is used, workability is good.

The non-woven fabric made of a thermoplastic resin used as the base sheet is preferably a flexible non-woven fabric in which the sum of the softness in the longitudinal direction and the softness in the transverse direction according to the Clark method (JIS L1090 C method) is 80 mm or less. In the present invention,
The “longitudinal direction” is a direction parallel to the web flow direction during the formation of the nonwoven fabric, and the “lateral direction” is a direction orthogonal to the web flow direction.

As the nonwoven fabric made of a thermoplastic resin used as the base sheet, a laminated nonwoven fabric made of a thermoplastic resin, for example, a three-layer nonwoven fabric of spunbonded nonwoven fabric / meltblown nonwoven fabric / spunbonded nonwoven fabric can also be used. . The total basis weight in this case is 15g
/ M ² , the texture is good and sufficient strength can be obtained.

The moisture-permeable film which can be preferably used as the base sheet of the present invention has water resistance and a moisture permeability of 300 g / m ² · 24 hr or more, preferably 500 to 50 hours.
It is those of 00g / ^{m 2} · 24hr. The moisture permeability in the present invention was measured under the conditions of a temperature of 40 ° C., a relative humidity of 60%, and a pure water method based on a method specified in ASTM E-96. Samples were randomly sampled at 10 points and the average value was calculated. The measurement time was 24 hours.

Preferred materials include thermoplastic elastomers having moisture permeability, such as polyurethane elastomers, polyester elastomers, and polyamide elastomers. Further, a polyolefin-based film made porous by performing a process such as film stretching can also be used. This will be described in detail below.

Thermoplastic urethane elastomers include 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.

More specifically, the urethane-based thermoplastic elastomer is obtained by addition-polymerizing diisocyanate in the presence of a short-chain polyol to a polylactone ester polyol such as polycaprolactone glycol (polyether polyurethane); and poly (ethylene-1). Addition polymerization of diisocyanate to adipate ester polyols such as 1,4-adipate) glycol and poly (butylene-1,4-adipate) glycol in the presence of short-chain polyol (polyester polyurethane); obtained by ring opening of tetrahydrofuran And the like. Examples thereof include those obtained by addition-polymerizing diisocyanate to the obtained polytetramethylene 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 are trade names).

As the polyester-based elastomer, a polyester / polyether elastomer having an aromatic dicarboxylic acid and a glycol as main components as a hard segment and a polyoxyalkylene glycol as a soft segment, or an aliphatic polyester as a soft segment. It is a polyester / polyester elastomer.

The aromatic dicarboxylic acid constituting the hard segment is preferably terephthalic acid or terephthalic acid and isophthalic acid, some of which are phthalic acid,
It may be substituted with 2,6-naphthalenedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, or the like. If the amount is small, it may be substituted with an aliphatic dicarboxylic acid.

The glycols constituting the hard segment include ethylene glycol, 1,3-propanediol, 1,2-propanediol, 1,4-tetramethylene glycol, 1,6-hexamethylene glycol, diethylene glycol and triethylene glycol. , Neopentyl glycol, 1,3-cyclohexane dimethanol, 1,4-cyclohexane dimethanol, etc., having a molecular weight of about 250 or less, especially ethylene glycol, 1,3-propanediol, 1,4-tetramethylene glycol. Preferred are those containing a glycol selected from

Examples of the polyoxyalkylene glycol that can be used as the soft segment include polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol, and polyoxyethylene / polyoxypropylene glycol. These have a molecular weight of about 400-6000,
Particularly, those having about 600 to 5000 are preferable.

Such a polyester / polyether elastomer has the following formula derived from an aromatic polyester.
The structural unit represented by (I) is defined as a hard segment, and the structural unit represented by the following formula (II) derived from polyoxyalkylene glycol is defined as a soft segment. .

[0060]

Embedded image

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 the hydroxyl groups at both ends from polyoxyalkylene glycol, and G is a divalent residue obtained by removing two carboxyl groups.

Such a polyester / polyether elastomer contains 15 to 80% by weight, particularly 25 to 68% by weight, of a polyoxyalkylene glycol unit and has a melting point of 100 to 220 ° C., preferably 1 to 80% by weight.
20-200 ° C, 230 ° C, 2160g
Melt flow rate under load is 0.1 to 1000 g
It is preferable to use the one for / 10 minutes, especially 1 to 100 g / 10 minutes. As such a polyester elastomer, for example, Hytrel (registered trademark, manufactured by DuPont)
Can be used.

The polyester / polyester elastomer is the same as the polyester / polyether elastomer, except that the polyester / polyester elastomer has an aliphatic polyester unit such as polyε-caprolactone or polybutylene adipate instead of the polyoxyalkylene glycol unit of the soft segment. Are preferably used having the same properties. More specifically, for example, those marketed under the trade name of GREAK can be exemplified.

Examples of the polyamide elastomer include a multi-block copolymer in which a polyamide is used as a hard segment and a polyester or polyol diol having a low glass transition temperature is used as a soft segment.
Here, as the polyamide component, nylon 6, 66,
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, and examples of the polyester diol include poly (ethylene-
1,4-adipate) glycol, poly (butylene-1,4-adipate) glycol, polytetramethylene glycol and the like. Specific examples include nylon 12 / polytetramethylene glycol block copolymer. Commercially available products include diamide (manufactured by Daicel Huls) and PEBAX (manufactured by Atochem) [both are trade names]
and so on.

[0065] These thermoplastic elastomers having moisture permeability can be formed into a film by a known forming method.

Other examples of the moisture-permeable film include a polyolefin-based film that has been made porous by performing a treatment such as film stretching. This porous film can be produced by melt-forming a resin composition containing a polyolefin-based resin and an inorganic filler, and other additives as necessary, to form a film, and stretching the film in at least one direction. . By this stretching treatment, interfacial separation between the polyolefin resin and the inorganic filler is caused to form a porous film.

The polyolefin-based resin preferably used is a homopolymer composed of monomers such as ethylene, propylene and 1-butene, and a copolymer containing these as a main component. Homopolymer (manufacturing method may be either low pressure method or high pressure method) or random of ethylene and α-olefin such as propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene Copolymers such as low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, polyethylene such as high-density polyethylene, propylene homopolymer, or propylene, ethylene, 1-butene, 1-
Α such as hexene, 4-methyl-1-pentene and 1-octene
-Polypropylene, such as random copolymers with olefins, poly 4-methyl-1-pentene, polybutene, ethylene / vinyl acetate copolymers, and mixtures thereof.

Examples of the inorganic filler include barium sulfate, calcium carbonate, calcium sulfate, barium carbonate,
Magnesium hydroxide, aluminum hydroxide, zinc oxide,
Examples include inorganic fillers such as magnesium oxide, titanium oxide, silica, and talc. Of these, barium sulfate and calcium carbonate are more preferred. These fine particle fillers may be used alone or in combination of two or more.

The composition ratio between the polyolefin resin and the inorganic filler affects the moisture permeability and the like of the film. If the proportion of the inorganic filler is too small, a film having good moisture permeability cannot be obtained, and if the proportion of the inorganic filler is too large, the moldability of the film becomes poor. The preferred composition ratio of the polyolefin-based resin and the inorganic filler is polyolefin-based resin 2
It is preferable that the inorganic filler is 75 to 30% by weight based on 5 to 75% by weight. Furthermore, 70 to 40% by weight of an inorganic filler is used with respect to 30 to 60% by weight of a polyolefin resin.
It is preferable that The average particle size of the inorganic filler is 20
μm or less, more preferably 10 μm
It is the following, more preferably 0.5 to 4 μm.

The method for producing a porous polyolefin film is as follows. The polyolefin resin and the inorganic filler are mixed using a Henschel mixer or the like, and then kneaded using a single-screw or twin-screw extruder to form pellets. Next, the pellets are melted at a temperature equal to or higher than the melting point of the polyolefin resin,
At a temperature of not less than ° C and less than the decomposition temperature, melting and film formation are performed using a known molding machine such as an extruder equipped with a T die or the like, or an inflation molding machine equipped with a circular die.
In some cases, it is possible to form a film directly with a molding machine without pelletizing. The formed film is then subjected to a stretching treatment. The stretching treatment is performed by a known method such as a roll method or a tenter method from room temperature to the softening point of the resin (JIS K-676).
At temperatures up to 0), the film is stretched in at least one direction to produce a porous polyolefin-based film. The preferred stretching ratio is 1.1 to 5 times.

The above-mentioned moisture-permeable film may have
Mineral, vegetable, animal, synthetic, petroleum wax, stretching aids such as oils and fats, dispersants, stabilizers, antioxidants, coloring agents, light stabilizers Flame retardants,
Various additives such as an antistatic agent, a deodorant, and an antibacterial agent may be added.

Thermal Bond Dry Nonwoven Fabric The thermal bond dry nonwoven fabric used in the present invention has a large number of loops that can be engaged with a male sheet fastener.
Here the planar fastener male part is, for example, Ltd. as a planar fastener male part which is commercially available under the trade name Beriku D ^TM from Kuraray, as long as it can engage with the planar fastener female material, in particular restrictions There is no.

Such a thermal bond dry nonwoven fabric is
Spunbond method, meltblowing method, card method, nonwoven fabric manufactured by dry process such as air laid method, the thermal bonding method to heat-bond the fibers constituting the nonwoven fabric,
A loop is formed. Specific examples of these nonwoven fabrics include those already exemplified as nonwoven fabrics usable as a base sheet. The fibers constituting the nonwoven fabric may be any heat-fusible fibers,
Preferably, a composite fiber composed of a high-melting resin (low-melting component) and a low-melting resin (high-melting component), specifically, a core of the high-melting resin and a sheath of the low-melting resin. It is composed of a core-sheath type composite fiber or a side-by-side type composite fiber comprising a high melting point resin part and a low melting point resin part, and the above (2), (3), (5), (6), (7) ),
The conjugate fiber exemplified in (8) and the like can be exemplified. The difference between the melting points of the high-melting resin (low-melting component) and the low-melting resin (high-melting component) is preferably 15 ° C. or more, and is in a range from the melting point of the low-melting resin to the melting point of the high-melting resin. It is preferable that the low-melting point resins are fused together by performing a heat treatment such as hot air through. The thermal bond dry nonwoven fabric thus obtained has a large number of fluffs that form loops on the surface of the nonwoven fabric.

Examples of the combination of the high melting point resin and the low melting point resin include polyethylene terephthalate and polyethylene, polyethylene terephthalate and polypropylene,
Examples include polypropylene and polyethylene. Among these, a combination of polyethylene terephthalate and polyethylene, and polypropylene and polyethylene, which can provide a large difference in melting point and have excellent flexibility, is preferable.

As the dry nonwoven fabric, a nonwoven fabric produced by the spun bond method is preferable in that the above-mentioned composite fiber is easily formed. In the present invention, a non-woven fabric obtained by heat-sealing a dry non-woven fabric with a thermal bond is used. By further gear stretching, the basis weight is reduced, and a stretched non-woven fabric having improved flexibility and bulkiness is also used. be able to.
In any case, the basis weight is preferably 15 to 70 g / m ^2.
As described above, more preferably those having 15 to less than 40 g / m ² are used. The fineness of the fibers constituting the nonwoven fabric is 2.0 to 4.0 denier, and the tensile strength (longitudinal direction) is 400.
It is preferably from 0 to 6000 g / inch. When the basis weight is in this range, it has a fiber fluff and a loop suitable for a planar fastener female material, and can increase the engagement force with the planar fastener male material. When using the gear stretched, the preferred basis weight of the dry nonwoven fabric used as a raw material is about 25 to 90 g / m ² , and after performing thermal fusion and loop formation by thermal bonding, The basis weight is 15 to 70 g / m ² , especially 15 to 40
A gear-stretched material having a g / m ² is preferably used.

In the present invention, as the thermal bond dry nonwoven fabric, a laminate of different dry nonwoven fabrics can be used as long as a low melting point resin can be fused by the same heat treatment. For example, nonwoven fabrics using the same polyethylene can be laminated on the sheath portion of the core-sheath type composite fiber or one resin portion of the side-by-side type composite fiber by the same heat treatment.

Sheet fastener female material The sheet fastener female material according to the present invention is a thermal bond having a large number of loops engageable with a sheet fastener male material on one surface of a breathable base sheet made of a thermoplastic resin. A dry nonwoven fabric is laminated by partial ultrasonic fusion. Here, the partial fusion means that the fusion parts are scattered like islands, and for example, a partial fusion part such as a linear shape or a dot shape in a pattern such as a mesh pattern, a rhombus pattern, or the like. It refers to the state of being formed and fused.

Observation of the cross section of the ultrasonically fused portion of the base sheet and the thermal bond dry nonwoven fabric with an electron microscope shows that a layer such as that seen when a thermoplastic resin such as polyethylene or polypropylene is laminated by ordinary thermal fusion. The structure is not observed, and is completely integrated. This is considered because the fusion interface vibrates due to the ultrasonic waves. The fusion site by ultrasonic fusion can also be observed with an optical microscope, and the fusion area ratio at that time is preferably 10% or less, for example, 5.0 to 9.5%.
Further, the width of the fused portion (line width for a line, short side length for a rectangle, diameter for a point) is preferably 1.5 mm or less. In such a range, a good interlayer bonding force between the substrate sheet and the thermally bonded nonwoven fabric can be obtained.

In the planar fastener female material of the present invention,
Many loops on the surface of the thermal bond dry nonwoven fabric other than the fusion site are stably held on one surface of the base sheet. The height of the above loop is usually 1000 to 2500 μ
m, preferably 2000 to 2500 μm,
Suitable for engaging the male fastener with the hook.

The thickness (measured by an optical microscope) of the planar fastener female material according to the present invention is usually from 1,000 to 5,000.
μm, and preferably 2000-3500 μm. The engaging force required for the planar fastener is selected according to the application. For example, when the fastener is used for fastening a disposable diaper, the engaging force is 500 g / mm by a measuring method described later.
It is desirable that the above is repeated (continuously repeated three or more times).

As described above, the planar fastener female material according to the present invention can be used to unwind and run a breathable base sheet made of, for example, a thermoplastic resin wound in a roll shape. While laminating a thermal bond dry nonwoven fabric having a large number of loops capable of engaging with the fastener male material on the base sheet, apply a horn provided in an ultrasonic welding device from above the thermal bond dry nonwoven fabric. It can be manufactured by emitting ultrasonic waves along a predetermined pattern and fusing the thermal bond dry nonwoven fabric to one surface of the base sheet.

[0082]

EXAMPLES Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited to these examples. Incidentally, the engaging force of the planar fastener female material obtained in the examples and comparative examples, a test piece is prepared by the following method,
In accordance with JIS K 6854, a 180 ° peel test was performed using a tensile tester under the conditions of a tensile speed of 300 mm / min and a distance between chucks of 100 mm.

<Production of Test Specimen> First, as shown in FIG. 4A, an adhesive tape (trade name: Scotch brand tape) manufactured by Sumitomo 3M Ltd. was attached to one side of an acrylic plate 5 having a thickness of 3.0 mm. (Scotch Brand Tape) # 465)
The planar fastener female material 6 (sample) is fixed via a not-shown. On the other hand, as shown in FIG. 4B, a polyethylene terephthalate film 7 having a thickness of about 45 μm was formed.
Adhesive tape manufactured by Sumitomo 3M Ltd. (trade name: Scotch Brand Tape)
# 950) (not shown) through the planar fastener male member 8
Is fixed. Then, the fixed planar fastener female material 6 and the planar fastener male material 8 are superimposed, and a roller having a weight of 700 g is reciprocated from the surface of the polyethylene terephthalate film 7 to connect the hook of the planar fastener male material 8 to the planar fastener female material. The test piece was engaged with the loop of the material 6.

Further, the thermal bond dry nonwoven fabric and the substrate sheet used in the examples were produced as follows. <Thermal bond dry nonwoven fabric> Nonwoven fabric-1 melt flow rate (according to ASTM D1238, 190 ° C, load 2.1
6 kg) is 50g / 10 min, polyethylene (melting point 130 Density (ASTM D1505) is 0.950 g / cm ³
° C) and a melting point of 255 according to ASTM D792.
° C and a core (core / sheath) made of polyethylene terephthalate having a density (ASTM D1505) of 1.38 g / cm ^3.
(Weight ratio) = 50/50) was melt-spun by a spun bond method to produce a web. The obtained web is passed through a hot blast stove at 120 ° C.
Heat-treated by hot air through, the basis weight of each example, made of fused fibers fused with polyethylene,
A thermal bond dry nonwoven fabric (nonwoven fabric-1) having a large number of loops was produced.

<Base Sheet> Nonwoven fabric-2 melt flow rate (according to ASTM D1238, 230 ° C., load 2.1
6 kg) is 60 g / 10 min and the density (ASTM D1505) is 0.910 g / cm ³ polypropylene (melting point 16
0 ° C.) to produce a web by a spunbond method, and the obtained web is subjected to an embossing treatment (an emboss area ratio of 10%) to obtain a polypropylene spunbond nonwoven fabric having a basis weight described in each of Examples. Nonwoven fabric-2) was produced.

Nonwoven fabric-3 Nonwoven fabric-2 was melt-spun using a spunbond method to produce a web having a basis weight of 6 g / m ² . It is then overlaid with a melt flow rate (ASTM
1000g / 10 according to D1238, 230 ℃, load 2.16kg)
Min and a density (ASTM D1505) of 0.910 g / cm ³
Melt blown fiber is sprayed by a melt blow method using polypropylene (melting point: 160 ° C.), and the basis weight is 3 g /
It was deposited so as to be m ^2. Further, the web is produced by melt-spinning the polypropylene on the nonwoven fabric-2 by a spun bond method using a non-woven fabric-2, and embossing (emboss area ratio: 10%) to give a total basis weight of 15 g /
It was produced a three-layer laminated nonwoven (nonwoven -3) span m ² bonded nonwoven / meltblown nonwoven / spun bond nonwoven fabric.

Moisture permeable film-1 melt flow rate (according to ASTM D1238, 190 ° C., load 2.1
6 kg) is 2.0 g / 10 min, density (ASTM D1505) of polyethylene 40 parts by weight is 0.915 g / cm ^3, calcium carbonate (Dowa Calfine Co., Ltd., trade name SST-40, average Particle size 1.0 μm) 60 parts by weight;
After 1.5 parts by weight of calcium stearate was mixed with a Henschel mixer, the mixture was melt-formed at 230 ° C. using an extruder. 2. The obtained film was subjected to a tenter method.
The film was uniaxially stretched 0 times to make it porous, thereby producing a moisture-permeable film-1 having a thickness of 25 μm.

Moisture permeable film-2 melt flow rate (according to ASTM D1238, 190 ° C., load 2.1
6 kg) is 2.0 g / 10 minutes, and 40 parts by weight of polyethylene having a density (ASTM D1505) of 0.915 g / cm ³ and calcium carbonate (trade name: SST-40, manufactured by Dowa Calfine Co., Ltd., average) Particle size 1.0 μm) 60 parts by weight;
After 1.0 part by weight of calcium stearate was mixed with a Henschel mixer, melt film formation was performed at 230 ° C. using an extruder. 1. The obtained film was subjected to a tenter method.
It was uniaxially stretched 0 times to make it porous, thereby producing a moisture-permeable film-2 having a thickness of 25 μm.

[0089] the nonwoven -1 [Example 1] basis weight 40 g / ^{m 2,} stacked on top of the nonwoven -2 basis weight 20 g / ^{m 2,} the length of the diagonal of 7.5mm and 7.5mm diamonds ( (Square) The ultrasonic wave was applied at a frequency of 15 Hz, a pressing pressure of 2.0 g / cm ² , a fusion line width of 1.5 mm, and a nonwoven fabric flow speed of 150 m / min using an ultrasonic sealer manufactured by Pinsonic Corporation along the pattern. Fused (Fused area ratio 7.5
%), A planar fastener female material in which a large number of loops of a thermally bonded dry nonwoven fabric are held on a base sheet. The engaging force of the planar fastener female member obtained as described above was measured in accordance with the above-described measuring method. Table 1 shows the results.

[0090] the nonwoven -1 [Example 2] basis weight 40 g / ^{m 2,} stacked on the nonwoven -3, ultrasonically welded in the same manner as in Example 1 to obtain a surface fastener female material. Table 1 shows the measurement results of the female sheet fastener.

Example 3 The nonwoven fabric 1 having a basis weight of 40 g / m ² was overlaid on the moisture permeable film 1 and subjected to ultrasonic fusion in the same manner as in Example 1 to obtain a female sheet fastener. Obtained. Table 1 shows the measurement results of the female sheet fastener.

[0092] the nonwoven -1 [Example 4] basis weight of 50 g / ^{m 2,} a basis weight superimposed over the nonwoven -2 20 g / ^{m 2,} ultrasonically welding in the same manner as in Example 1, the surface A zipper female material was obtained. Table 1 shows the measurement results of the female sheet fastener.

[0093] the nonwoven -1 [Example 5] basis weight 20 g / ^{m 2,} stacked on top of the nonwoven -2 basis weight 30 g / ^{m 2,} ultrasonically welding in the same manner as in Example 1, the planar fastener A female material was obtained. Table 1 shows the measurement results of the female sheet fastener.

[0094] the nonwoven -1 [Example 6] basis weight 20 g / ^{m 2,} stacked on the nonwoven -3, ultrasonically welded in the same manner as in Example 1 to obtain a surface fastener female material. Table 1 shows the measurement results of the female sheet fastener.

[0095] the nonwoven -1 [Example 7] a basis weight of 20 g / m ^2, superimposed on the moisture-permeable film -2 similarly ultrasonic fusion as in Example 1, the surface fastener Mesuzai Obtained. Table 1 shows the measurement results of the female sheet fastener.

[0096] the nonwoven -1 Example 8 weight per unit area 30 g / ^{m 2,} a basis weight superimposed over the nonwoven -2 30 g / ^{m 2,} ultrasonically welding in the same manner as in Example 1, the surface A zipper female material was obtained. Table 1 shows the measurement results of the female sheet fastener.

[0097]

[Table 1] In the above embodiment, the measured values of the engagement force showed the same value at least three times or more.

[0098]

According to the present invention, the thermal fastener dry nonwoven fabric itself has a large number of loops.
Since the human skin does not rub and the loop is stably held on the surface of the nonwoven fabric, it is flexible and hygienic and safe. Further, the female sheet fastener according to the present invention has an engaging force that can withstand the actual use opening and closing times (two to three times) per disposable diaper, and is low in cost, so that it is a disposable diaper or other disposable product. It is suitable for use.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating a concentric core-sheath composite fiber.

FIG. 2A is a schematic cross-sectional view illustrating an eccentric core-sheath composite fiber. FIG. 2B is a schematic cross-sectional view illustrating another eccentric core-sheath composite fiber.

FIG. 3 is a schematic cross-sectional view illustrating a side-by-side type conjugate fiber.

FIG. 4 is a drawing for explaining a method of preparing a test piece used for measuring an engaging force in an embodiment of the present invention, and FIG. 4 (A) shows that a female sheet fastener is fixed to one surface of an acrylic plate. FIG. 4B is a perspective view showing a state in which
FIG. 3 is a plan view showing a state in which a male sheet fastener is fixed to one surface of a polyethylene terephthalate film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core part 2 Sheath part 3 One resin of side-by-side type composite fiber 4 The other resin of side-by-side type composite fiber 5 Acrylic plate 6 Female planar fastener 7 Polyethylene terephthalate film 8 Male planar fastener

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Taro Ichikawa 2-1 Tango-dori, Minami-ku, Nagoya-shi, Aichi F-term (reference) in Mitsui Chemicals, Inc. 3B100 DA07 DB02 4L047 AA14 AA21 AA27 AB10 BA08 BA23 CA05 CA06 CA19 CB08 CC03 CC04 DA00 EA05 EA10 EA12

Claims (6)

[Claims] A thermally bonded dry nonwoven fabric having a large number of loops engageable with a male sheet fastener is partially laminated on one surface of a breathable base sheet made of a thermoplastic resin by partial ultrasonic fusion. Wherein the plurality of loops are held on one surface of the air-permeable base sheet. 2. The thermal bond dry nonwoven fabric according to claim 1, wherein
Is 15 to 70 g / m ²2. The surface according to claim 1, wherein
Zipper female material. 3. The thermal bond dry nonwoven fabric is composed of a composite fiber composed of a high-melt component and a low-melt component forming at least a part of the fiber surface, and is thermally fused by a thermal bond method. The planar fastener female material according to claim 1 or 2, wherein the loop is formed by: 4. The planar fastener female material according to claim 3, wherein the high-melting component portion of the conjugate fiber is polyethylene, and the low-melting component portion is selected from polyethylene terephthalate and polypropylene. 5. The planar fastener female material according to claim 1, wherein a fusion area ratio by ultrasonic fusion is 10% or less. 6. The planar fastener female material according to claim 1, wherein the base sheet is a nonwoven fabric or a moisture-permeable film made of a thermoplastic resin.