JP4467528B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin or a disposable diaper, and more particularly to an absorbent article having extremely high flexibility and excellent fit.

  Conventional absorbent articles have been studied mainly from the viewpoint of improving the shape of the absorbent article and the absorbent performance of the absorbent polymer as a means for enhancing the leak-proof property. For example, a leak-proof wall is provided on both sides along the longitudinal direction of the absorbent article to prevent side leakage of urine, menstrual blood, etc., or the absorbent article has a shape that fits the wearer's body shape. It has been done to prevent.

  However, since the wearer's body shapes vary widely, it is difficult to design an absorbent article with a shape that perfectly fits all the wearer's body shapes. In many cases, the above-described leak-proof wall or the like cannot sufficiently perform its original function.

  Patent Document 1 describes an absorbent article using a top sheet and a back sheet having a specific elastic recovery rate for the purpose of improving fit to the body. However, since the technique described in this publication is a technique with a relatively low elongation rate (up to 30%), the absorbent body itself is not provided with stretchability or stretchability, and has a very high followability to the body. Absent. Further, since the back sheet described in this publication is made of an elastomer, the strain becomes large at the time of high elongation, and there is a disadvantage that the followability to the body cannot be expected.

JP-A-2-156947

  Accordingly, an object of the present invention is to provide an absorbent article that easily fits the wearer's body shape and does not cause a positional shift even when violently exercising.

  As a result of intensive studies, the present inventors have found that an absorbent article that can achieve the above object can be obtained by forming each member constituting the absorbent article from a structurally deformable material.

The present invention includes a liquid-permeable skin contact layer, a liquid-impermeable non-skin contact layer, and a liquid-retaining absorbent portion interposed between the skin contact layer and the non-skin contact layer. In absorbent articles that
The skin contact layer and the non-skin contact layer are formed of a material that can be expanded and / or stretched, and the absorbent portion is an extension and / or extension of the skin contact layer and the non-skin contact layer. It is made of a material that does not hinder expansion and contraction ,
The object is achieved by providing an absorbent article characterized in that fibers comprising a thermoplastic elastomer are used as the material for forming the skin contact layer .

  According to the absorbent article of the present invention, it is easy to fit the wearer's body shape, and positional displacement does not occur even after intense exercise or the like.

  Hereinafter, preferred embodiments of the absorbent article of the present invention will be described with reference to the drawings. Here, FIG. 1 is a partially broken perspective view showing the structure of the sanitary napkin as the first embodiment of the absorbent article of the present invention.

The sanitary napkin 1 of the embodiment shown in FIG. 1 is formed substantially vertically long, and is a liquid-permeable skin contact layer 2, a liquid-impermeable non-skin contact layer 3, and the skin contact. A liquid-retaining absorbent portion 4 interposed between the layer 2 and the non-skin contact layer 3 is provided.
The skin contact layer 2 covers the upper surface (skin contact surface) and the left and right side surfaces along the longitudinal direction of the absorbent portion 4 and an adhesive (not shown) on the lower surface (non-skin contact surface) side. Thus, the non-skin contact layer 3 is bonded and fixed. At the same time, the skin contact layer 2, the non-skin contact layer 3, and the absorption part 4 are fixed to each other by pressure bonding parts 5, 5 on the left and right side parts along the longitudinal direction of the sanitary napkin 1. .
In addition, the skin contact layer 2 and the non-skin contact layer 3 extend outward from both front and rear edge portions along the width direction of the absorbent portion 4, and are bonded and fixed by an adhesive at the extended portion. ing.
The above configuration is the same as that of a conventional sanitary napkin.

  Thus, in the sanitary napkin 1 of the present embodiment, the skin contact layer 2 and the non-skin contact layer 3 are formed of a stretchable and / or stretchable material, and the absorbent portion 4 is formed. The skin contact layer 2 and the non-skin contact layer 3 are formed of a material that does not hinder expansion and / or expansion / contraction. In the present specification, the “extensible and / or stretchable material” means a material that can be structurally deformed (stretched and / or stretched) by a mechanical external force. When the material is stretchable and / or stretchable, the skin contact layer 2 or the like is formed of a material having stretch elasticity, and the skin contact layer 2 or the like can be structurally deformed by the stretch elasticity of the material itself. Both when the material itself does not have stretch elasticity, and when the skin contact layer 2 or the like is formed from the material, and is formed by a forming method that causes structural deformation. Include.

  As the skin contact layer 2, a non-woven fabric formed from elastomer fibers or a stretchable film having a large number of apertures is preferably used.

The said nonwoven fabric formed from the elastomer fiber is made into a nonwoven fabric by using various elastomer fibers by a known nonwoven fabric manufacturing method, for example, a spunbond method or a card method.
As the above-mentioned elastomer fiber, the hard elastomer component made of crystalline polypropylene is used as the first component, and the thermoplastic elastomer is used as the second component because it is easy to form into the nonwoven fabric and the texture and feel of the resulting nonwoven fabric are good. An elastic composite fiber as a component is preferably used.

  The crystalline polypropylene that is the first component in the elastic conjugate fiber can be used without particular limitation as long as it has hard elastic properties. Preferable examples of the crystalline polypropylene include a homopolymer of propylene, a copolymer with ethylene mainly composed of propylene, and a copolymer with α-olefin mainly composed of propylene.

  The crystalline polypropylene preferably has a crystallinity of 40% or more. If the crystallinity is less than 40%, the fiber elongation recovery rate may be insufficient. The crystallinity is a value calculated based on the energy required for melting the crystal measured according to the DSC (Differential Scanning Calorimetry) method.

The crystalline polypropylene preferably has a melt index of 1 to 200 g / 10 minutes, and more preferably 3 to 50 g / 10 minutes. If the melt index is less than 1 g / 10 minutes, the melt viscosity may be too high and spinning may be difficult, and if it exceeds 200 g / 10 minutes, the melt viscosity is too low and breakage may occur before fiberization. Since it may occur, it is preferable to be within the above range. The melt index is ASTM
It is a value measured under a load of 2.16 kgf at 230 ° C. according to D-1238.

  In addition, the crystalline polypropylene preferably has a weight average molecular weight of 10,000 to 1,000,000, and preferably has a weight average molecular weight of 10,000 to 1,000,000 from the viewpoint that stretch elasticity can be easily expressed and the elastic composite fiber can be easily spun. More preferably, it is 600,000.

The thermoplastic elastomer which is the second component in the elastic conjugate fiber is generally composed of a flexible component (soft segment, soft phase) having rubber elasticity in the molecule and a molecular constraint component (hard segment, for preventing plastic deformation). Hard phase).
The thermoplastic elastomer can be classified according to the type of its hard segment. In the present invention, styrene elastomer, olefin elastomer, vinyl chloride elastomer, urethane elastomer, ester elastomer, amide elastomer, syndiotactic Poly (1,2-butadiene) and poly (trans-1,4-isoprene) can be preferably used. Of these thermoplastic elastomers, urethane elastomers and ester elastomers can be particularly preferably used.

The urethane elastomer preferably used includes, for example, a block having a urethane bond as a hard segment and a block having a polycarbonate polyol, an ether polyol, a caprolactone polyester, an adipate polyester or the like as a soft segment. Examples include urethane elastomers.
Examples of the ester elastomer preferably used include an ester elastomer composed of a block having an aromatic polyester as a hard segment and an aliphatic polyether or a block having an aliphatic polyester as a soft segment. Can be mentioned.

In particular, in consideration of processability, cost, light resistance, chemical resistance, skin irritation and the like, ethylene-α-olefin produced using metallocene (cyclopentadienyl complex) as a catalyst as the thermoplastic elastomer. It is particularly preferable to use a copolymer. That is, it is particularly preferable that the nonwoven fabric formed from the elastomer fiber contains an ethylene-α-olefin copolymer (hereinafter also referred to as “metallocene PE elastomer”) produced using metallocene as a catalyst.
In the ethylene-α-olefin copolymer, the α-olefin to be copolymerized with ethylene is an α-olefin having 3 to 30 carbon atoms such as propylene, 1-butene, 1-pentene, 1-hexene, 1 -Octene, 1-heptene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-pentene, octadecene and the like. Among these, 1-hexene, 1-octene, 1-heptene, and 4-methyl-1-pentene are preferably used.
The blending ratio of ethylene and α-olefin in the ethylene-α-olefin copolymer is preferably 40 to 98% by weight of ethylene and 60 to 2% by weight of α-olefin.
Examples of the metallocene (cyclopentadienyl complex) used as a catalyst include compounds represented by the following formula (I).
ML _x (I)
[In the formula, M represents a transition metal selected from the group consisting of Zr, Ti, Hf, V, Nb, Ta and Cr; L is a ligand coordinated to the transition metal; A group having an enyl skeleton, an alkoxy group having 1 to 12 carbon atoms, an aryloxy group having 1 to 12 carbon atoms, a trialkylsilyl group having 1 to 12 carbon atoms, an SO ₃ R group (where R is a halogen atom, etc.) A hydrocarbon group having 1 to 8 carbon atoms which may have a substituent), a halogen atom or a hydrogen atom, and x is the same number as the valence of the transition metal.
However, when a plurality of Ls are coordinated, they may be different groups, but at least one is a group having a cyclopentadienyl skeleton. That is, when x is 1, L is a group having a cyclopentadienyl skeleton. When x is 2 or more, at least one of the plurality of L is cyclopentadienyl. This is a group having an enyl skeleton. ]

  In order to modify the melt fluidity of these thermoplastic elastomers, a thermoplastic plastic, an oil component, or the like may be added.

  The thermoplastic elastomer preferably has a stretch recovery rate of 50% or more when stretched at 100% from the viewpoint of being able to follow the movement of the human body without causing damage.

  In the elastic conjugate fiber, the content of the first component is preferably 5 to 70% by weight, the content of the second component is 95 to 30% by weight, and more preferably the first component. The content of the second component is 90 to 40% by weight, more preferably the content of the first component is 10 to 50% by weight. The content of the two components is 90 to 50% by weight. If the content of the first component exceeds the above upper limit or the content of the second component does not satisfy the above lower limit, the elasticity of the elastic composite fiber may be insufficient, and the first component The amount of the second component is exposed on the surface of the elastic composite fiber when the content of the second component is less than the above lower limit or the content of the second component exceeds the upper limit, and the tactile sensation decreases. In addition, since it may be difficult to spin the sheath-core type elastic composite fiber, it is preferably within the above range.

  If the said elastic composite fiber is a fiber form which can express elastomeric property, there will be no restriction | limiting in particular in the fiber form. Preferred fiber forms of the elastic conjugate fiber include a parallel type (side-by-side type), a split type (fiber cross section divided into an arc shape), and a sheath core type (sheath core type (concentric and eccentric). Type)] and the like. The elastic composite fibers in these fiber forms can be produced by a known spinning method. In addition, when using a sheath-core type elastic composite fiber, spinning is performed so that the component having the lower melting point of the first component and the second component becomes a sheath.

In addition, as the nonwoven fabric formed from elastomer fibers, those that are perforated so as to allow liquid permeation to melt blown nonwoven fabrics composed of various thermoplastic elastomers can also be used. Further, the surface of the melt blown nonwoven fabric made of various thermoplastic elastomers may be mechanically scratched to raise the surface.
In particular, the above-mentioned urethane elastomer, ester elastomer, metallocene PE elastomer, and the like are preferably used as the thermoplastic elastomer. Among them, the metallocene PE elastomer can be particularly preferably used from the viewpoint of low irritation to the skin.

On the other hand, the stretchable film having a large number of apertures is obtained by forming a large number of apertures in a stretchable film formed from various elastomer materials. As the elastomer material, the same thermoplastic elastomer as the second component of the elastic composite fiber described above can be used, and metallocene PE elastomer is particularly preferably used.
Moreover, there is no restriction | limiting in particular in the formation method of the said opening, A conventionally well-known method, for example, the method of forming an opening mechanically with a punch pin, the method of forming an opening by vacuum suction, etc. can be used.
In addition, in the said elastic film which has many apertures, you may perform various surface treatments, for example, raising process, etc. for improving the texture and the touch of the skin contact surface.

In the present invention, it is also preferable to use a stretchable nonwoven fabric as the skin contact layer 2.
For example, as a nonwoven fabric that can be stretched laterally, a spunlace nonwoven fabric, a spunbond nonwoven fabric that is point bonded by heat embossing, but the fiber itself is crimped or subjected to a process that can be structurally deformed, a heat roll nonwoven fabric, etc. Can be used alone as the skin contact layer 2. The basis weight of these nonwoven fabric is preferably 10 to 50 g / m ^2, more preferably 15 to 30 g / m ^2.
In this case, in order to positively express the stretching force in these nonwoven fabrics, the above-described thermoplastic elastomer may be laminated and integrated with these nonwoven fabrics. For example, some of the above-mentioned spunbond nonwoven fabrics and heat roll nonwoven fabrics can exhibit a relatively strong return force (shrinkage force), but spunlace nonwoven fabrics tend to have insufficient return force (shrinkage force). By laminating and integrating the thermoplastic elastomer with the lace nonwoven fabric and opening the holes, the skin contact layer 3 is suitable.
In the case of spunbond nonwoven fabric, heat roll nonwoven fabric, and spunlace nonwoven fabric, the types of fibers constituting the stretchable nonwoven fabric are olefins such as polyethylene and polypropylene, or polyesters such as polyethylene terephthalate and polybutylene terephthalate. Can be used. Moreover, you may use the composite fiber by these combinations as needed, what laminated | stacked these fibers in layer shape, or the thing which mixed these fibers. These fibers preferably have a fiber diameter of 1.0 to 10 denier, and more preferably 1.0 to 5.0 denier.

  The skin contact layer 2 made of a nonwoven fabric formed from an elastomer fiber, a stretchable film having a large number of apertures, or a stretchable nonwoven fabric, has a conventionally known hydrophilization treatment, for example, A surfactant or the like may be applied.

When a stretchable layer is used as the skin contact layer 2, the stretch recovery rate at 100% stretch is 90-60%, and can follow the movement of the human body without causing damage. From the point which becomes. Note that this is not the case when a stretchable nonwoven fabric is used as the skin contact layer 2.
The skin contact layer 2 is not particularly limited in basis weight, but is preferably 10 to 50 g / m ² and preferably 15 to 30 g / m ² in order to obtain a thin absorbent article. Is more preferable.

  Next, the non-skin contact layer 3 will be described. As the non-skin contact layer 3, a stretchable film or a laminate of a stretchable film and a stretchable nonwoven fabric is preferably used.

As said elastic film, what was formed from the raw material similar to the elastic film preferably used in the said skin contact layer 2 can be used, and especially a metallocene PE elastomer is used preferably.
In order to improve the texture and feel of the stretchable film, the stretchable film is preferably subjected to surface modification such as raising treatment or laminated with a fabric such as a nonwoven fabric. There is no particular limitation on the lamination method. For example, when the stretchable film is melt-molded into a sheet, the laminate is melt-laminated on the fabric, or the preformed stretchable film and the fabric are thermocompression-laminated. Or laminating with a frame, or a hot melt adhesive or a liquid adhesive.

In particular, it is preferable to use a stretchable film having moisture permeability as the stretchable film from the viewpoint of preventing stuffiness in the wearing.
The stretchable film having moisture permeability is preferably nonporous and formed from a moisture-permeable urethane-based elastomer or a moisture-permeable ester-based elastomer. The stretchable film has a moisture permeability (JIS Z 0208) of preferably 0.5 g / (100 cm ² · hr) or more, more preferably 0.5 to 5 g / [100 cm ² · hr]. 1.0 to 5 g / [100 cm ² · hr] is more preferable.
Examples of the moisture-permeable urethane elastomer preferably used include, for example, JP-A-7-70936, JP-A-6-134000, JP-B-6-67604, JP-A-1-141669, JP-B-1 Examples thereof include urethane elastomers described in Japanese Patent No. 52-11042, and Soflan palm (trade name) manufactured by Toyo Tire & Rubber.
On the other hand, examples of the moisture-permeable ester-based elastomer preferably used include ester-based elastomers described in JP-A No. 51-111290 and Frekuma (trade name) manufactured by Nippon Synthetic Chemical.

  The moisture permeable urethane elastomer and the moisture permeable ester elastomer may be used alone or in combination. When both are used in combination, there is no particular limitation on the blending ratio, but when the moisture-permeable urethane elastomer is used for main blending or when the anti-skin contact layer 3 is imparted with an anti-blocking effect. For this, the hardness of the moisture-permeable ester-based elastomer may be selected and blended.

As the stretchable film, the moisture-permeable urethane-based elastomer or the moisture-permeable ester-based elastomer is fused to a nonwoven fabric made of polyolefin fibers and used as a laminated sheet, or heat-sealed with a polyolefin-based member. When performing, it is preferable from the point which can improve a laminating property and heat-sealability to shape | mold the said elastic film from what blended these elastomers with the olefin type thermoplastic resin.
Examples of the olefinic thermoplastic resin include homopolymers such as ethylene and propylene, and copolymers of ethylene and propylene with other polymerizable monomers, but are not limited thereto. Examples of the polymerizable monomer include acrylic acid, acrylic ester, vinyl alcohol, maleic anhydride, methacrylic acid, methacrylic ester, glycidyl methacrylate, and vinyl acetate.
Preferred examples of the olefinic thermoplastic resin include a copolymer of ethylene and acrylic acid, ethyl acrylate, vinyl alcohol maleic anhydride, or vinyl acetate.

  The olefinic thermoplastic resins may be used alone or in combination of two or more. When the olefinic thermoplastic resin is used in combination of two or more, the stretchability is particularly high when low density polyethylene (LDPE) and an olefinic copolymer (for example, ethylene / ethyl acrylate copolymer) are used. Since the fluidity | liquidity and adhesiveness of a melt at the time of shape | molding a film improve, it is preferable.

  When the stretchable film having moisture permeability is molded by blending the moisture-permeable urethane elastomer or moisture-permeable ester elastomer and the olefin-based thermoplastic resin, the blending ratio of both is the moisture permeability. It is preferable to use 99 to 51 parts by weight of a urethane-based elastomer or a moisture-permeable ester-based elastomer and 1 to 49 parts by weight of the polyolefin-based thermoplastic resin. Low adhesion effect when laminated with non-woven fabric if the blending amount of the moisture permeable urethane elastomer or moisture permeable ester elastomer exceeds 99 parts by weight or the content of the polyolefin thermoplastic resin is less than 1 part by weight. When the blending amount of the moisture permeable urethane elastomer or moisture permeable ester elastomer is less than 51 parts by weight or the content of the polyolefin thermoplastic resin exceeds 49 parts by weight, the moisture permeable urethane elastomer or moisture permeability Since there exists a possibility of inhibiting the moisture permeability which ester elastomer has, it is preferable to set it as the said range. More preferably, the stretchable film 2 having moisture permeability is composed of 99 to 60 parts by weight of the moisture-permeable urethane elastomer or moisture-permeable ester elastomer and 1 to 40 parts by weight of the polyolefin-based thermoplastic resin.

  In addition to the moisture-permeable urethane-based elastomer or the moisture-permeable ester-based elastomer and the olefin-based thermoplastic resin, it is also preferable to add a resin or the like that acts as a compatibilizer for both. Such other resin can be preferably blended in an amount of 0.1 to 10 parts by weight with respect to 100 parts by weight of the moisture-permeable urethane elastomer or moisture-permeable ester elastomer. Furthermore, you may mix | blend various additives, such as a lubricant, an antiblocking agent, a heat / light stabilizer, an antistatic agent, and a coloring agent, as needed.

The non-skin contact layer 3 preferably has a stretch recovery rate of 100 to 60% when stretched to 100% from the viewpoint that it can follow the movement of the human body without causing damage.
Also, the non-skin contact layer 3 is not particularly limited in its basis weight is preferably from 10 to 50 g / m ² in order to make the absorbent article thin, is between 12 and 25 g / m ² More preferably.

  Next, the absorbent part 4 will be described. As the absorbent part 4, a foamed sheet or stretchable nonwoven fabric to which an absorbent polymer is attached, or an stretchable nonwoven fabric in which the absorbent polymer is directly polymerized on the fiber surface is preferably used. It is done.

  As the foam sheet or stretchable nonwoven fabric to which the absorbent polymer is attached, 1) a foam-like foam sheet made of urethane resin, olefin resin or the like, with the absorbent polymer attached to the surface, 2) a pair of the above An absorbent polymer sandwiched between foam sheets, 3) An absorbent polymer sandwiched between the foam sheet or stretchable nonwoven fabric and the stretchable film used for the non-skin contact layer 3 4) A material in which an absorbent polymer is sandwiched between the stretchable film and the stretchable nonwoven fabric. As the stretchable nonwoven fabric used at this time, a spunlace nonwoven fabric composed of hydrophilic fibers is suitable. In addition, the foamed sheet may be subjected to a hydrophilic treatment in order to increase the absorbability of body fluid.

An extensible nonwoven fabric obtained by directly polymerizing an absorbent polymer on the fiber surface is impregnated with a solution containing a polymerizable monomer capable of forming an absorbent polymer in the extensible nonwoven fabric, and then the monomer is polymerized. Is obtained. Such a polymerization method is described in, for example, JP-A-61-275355 and JP-B-6-94625.
The stretchable nonwoven fabric is structurally deformed by the action of the fibers if the fibers forming it have stretch elasticity, and even if the fibers do not have stretch elasticity, for example, spunlace Structural deformation is manifested by the entangled state of its own fibers like a non-woven fabric. That is, since the spunlace nonwoven fabric maintains its form as a nonwoven fabric by mechanical entanglement of the fibers, the entangled state changes (for example, elongates) by mechanical external force, and structural deformation appears. .
As the spunlace nonwoven fabric, a spunlace nonwoven fabric made of polyolefin fiber, polyester fiber, cotton, rayon or the like, or Toyobo run seal (trade name, spunlace nonwoven fabric made of hydrolyzate of acrylic fiber) can be used. .
Further, as the stretchable nonwoven fabric, a point-bonded nonwoven fabric such as a spunbond nonwoven fabric or a heat roll nonwoven fabric, in which the constituent fibers themselves are crimped or structurally deformed is used. be able to. In this case, it is preferable to use a spunbond nonwoven fabric or heat roll nonwoven fabric of polyolefin fibers or polyester fibers.
These stretchable nonwoven fabrics may be used for the purpose of immobilizing the plasticized absorbent polymer described below.

In particular, as the absorbent part 4, a crosslinked water-absorbing polymer is fixed to a stretchable nonwoven fabric, and the crosslinked water-absorbing polymer has a boiling point of 200 ° C. or more with respect to 100 parts by weight of the crosslinked water-absorbing polymer. It is preferable to use a plasticizer composed of 60 to 200 parts by weight of water-soluble polyether and 3 to 60 parts by weight of water because the absorption performance is extremely improved.
The plasticizer is preferably composed of at least one selected from the group consisting of glycerin, polyglycerin, trimethylolpropane, hexanetriol, sorbitol, and polypropylene glycol having an average molecular weight of 130 to 400 and water.
Such an absorbent portion can be extended by plasticizing the crosslinked water-absorbing polymer with a plasticizer comprising the water-soluble polyol and / or the water-soluble polyether and water with respect to 100 parts by weight of the crosslinked water-absorbing polymer. It is preferably produced by mixing in a nonwoven fabric and pressure bonding the stretchable nonwoven fabric.

Moreover, only an absorptive polymer can also be used as the said absorption part 4. FIG. In this case, the absorbent polymer is dispersed on the inner surface of the non-skin contact layer 3 (inside the sanitary napkin), and is fixed to the non-skin contact layer 3 by a bonding means such as an adhesive. As a result, the absorbent polymer also undergoes structural deformation following the structural deformation of the non-skin contact layer 3. It is preferable to use the absorbent portion 4 having such a structure because the entire thickness of the sanitary napkin 1 can be extremely reduced. In this case, the absorbent polymer may be coated with the above-described stretchable nonwoven fabric or the like (that is, the absorbent polymer is sandwiched between the stretchable nonwoven fabric and the non-skin contact layer 3 and the stretchable nonwoven fabric can be stretched). A non-woven fabric and the non-skin contact layer 3 may be bonded together).
Examples of the absorbent polymer include 60 to 200 parts by weight of a water-soluble polyol and / or water-soluble polyether having a boiling point of 200 ° C. or higher with respect to 100 parts by weight of the above-described crosslinked water-absorbing polymer, that is, 3 parts of water. Particularly preferred is a crosslinked water-absorbing polymer plasticized with a plasticizer consisting of ˜60 parts by weight.

  The sanitary napkin 1 of the embodiment shown in FIG. 1 has extremely high flexibility as a whole, and has high fit to the wearer's body. Specifically, it is preferable that the sanitary napkin 1 has a stretch recovery rate of 100 to 60% when stretched by 50% from the viewpoint of being able to follow the movement of the human body without causing damage.

  Next, 2nd-4th embodiment of the absorbent article of this invention is described with reference to FIGS. Here, FIG. 2 is a partially broken plan view of the deployable disposable diaper as the second embodiment of the absorbent article of the present invention as seen from the skin contact layer side, and FIG. 3 is the absorbent of the present invention. It is a perspective view which shows the underpants type disposable diaper as 3rd Embodiment of articles | goods, FIG. 4 is a perspective view which shows the mounting state of the disposable sanitary shorts as 4th Embodiment of the absorbent article of this invention. FIG. 5 is a developed view of the state before assembly of the disposable sanitary shorts shown in FIG. 4 as seen from the skin contact layer side. Note that the second to fourth embodiments will be described only with respect to differences from the first embodiment, and the same points will not be described in particular, but the detailed description of the first embodiment will be applied as appropriate. 2-5, the same code | symbol was attached | subjected about the same member as FIG.

The unfolded disposable diaper 10 of the embodiment shown in FIG. 2 includes a liquid-permeable skin contact layer 2, a liquid-impermeable non-skin contact layer 3, and the skin contact layer 2 and the non-skin contact layer 3. And a liquid-retaining absorbent portion 4 interposed therebetween.
The skin contact layer 2, the non-skin contact layer 3, and the absorption part 4 are each formed with a portion corresponding to the crotch part of the diaper and curved in an hourglass shape. And in the abdominal side waist part 15 and back side waist part 15 'located before and behind the said absorption part 4, the said skin contact layer 2, the said non-skin contact layer 3, and the 1st elasticity interposed between these Waist gathers are formed by the members 17 respectively. Further, leg gathers 16, 16 positioned on the left and right sides of the absorbing portion 4 are respectively provided with leg gathers by the skin contact layer 2, the non-skin contact layer 3, and the second elastic member 18 interposed therebetween. Is formed. The diaper 10 can be fitted to the wearer's waist and crotch by these waist gathers and leg gathers.
Fastening tapes 19 for fastening the abdominal side waist portion 15 and the back side waist portion 15 'when the diaper 10 is mounted are disposed on both sides in the width direction of the back side waist portion 15' of the diaper 10. Has been. In addition, a landing tape (not shown) as a portion to which the fastening tape 19 is attached is disposed on the surface of the non-skin contact layer 3 in the ventral waist 15 of the diaper 10. The fastening tape 19 is configured to be fixed to the landing tape.

  Thus, in the unfoldable disposable diaper 10, the skin contact layer 2, the non-skin contact layer 3, and the absorption part 4 are each composed of the above-described materials. As a result, the diaper 10 easily fits the wearer's body shape and does not shift in position following the wearer's body. Accordingly, liquid leakage or the like is effectively prevented.

The pants-type disposable diaper 20 of the embodiment shown in FIG. 3 includes a liquid-permeable skin contact layer 2, a liquid-impermeable non-skin contact layer 3, and the skin contact layer 2 and the non-skin contact layer 3. The absorptive main body 25 having the liquid-retaining absorbent part 4 interposed between the abdomen and the abdominal side part 26 located on the abdomen side of the wearer in the absorptive main body 25 and the back side part 27 located on the back side A waist opening 28 and a pair of leg openings 29, 29 are formed by joining and fixing the respective side edges.
In the diaper 20, the left and right side edges of the abdominal side part 26 and the left and right side edges of the back side part 27 are joined and fixed, and a pair of joint parts 23, 23 are formed on the left and right side edges of the diaper 20. Has been. The bonding and fixing is performed such that the skin contact layers 2 at the side edges are in contact with each other.
Further, the waist opening 28 and the pair of leg openings 29, 29 are respectively provided with a first elastic member 17 and a second elastic member 18 that form a gather that is substantially continuous over the entire circumference of the periphery. Is provided.

  Thus, in the pants-type disposable diaper 20, the skin contact layer 2, the non-skin contact layer 3, and the absorption part 4 are each composed of the above-described materials. As a result, the diaper 20 easily fits the wearer's body shape and does not shift in position following the wearer's body. Accordingly, liquid leakage or the like is effectively prevented.

The disposable sanitary shorts 30 of the embodiment shown in FIGS. 4 and 5 includes a liquid-permeable skin contact layer 2, a liquid-impermeable non-skin contact layer 3, and the skin contact layer 2 and the non-skin contact. A liquid-retaining absorbent portion 4 interposed between the contact layer 3 is provided.
As shown in FIG. 5, the non-skin contact layer 3 has a substantially hourglass shape in which a substantially central portion along the longitudinal direction is constricted, and the abdominal side C located on the abdomen side of the wearer when worn, It is comprised from the back side part A located in the back side, and the crotch part B located in the crotch.
A pair of connection panels 35 and 35 'are joined and fixed to the left and right side edges of the back side A in the non-skin contact layer 3 by joining means such as hot melt or heat sealing. Then, by connecting and fixing the left and right side edges of the abdominal side C and the left and right side edges of the back side A via the connecting panels 35 and 35 ', as shown in FIG. A waist opening 28 and a pair of leg openings 29 and 29 are formed.
As shown in FIG. 5, the skin contact layer 2 is disposed in the crotch portion B of the non-skin contact layer 3, and the skin contact layer 2 and the non-skin contact layer 3 A rectangular absorbent part 4 is interposed between the skin contact layer 2 and the absorbent part 4 when the sanitary shorts 30 are worn.

  Thus, in the sanitary shorts 30, the skin contact layer 2, the non-skin contact layer 3, and the absorption portion 4 are each made of the above-described material. The connecting portions 35 and 35 'are made of a stretchable member. As a result, the sanitary shorts 30 are easily fitted to the wearer's body shape, and do not shift in position following the wearer's body. Accordingly, liquid leakage or the like is effectively prevented.

As mentioned above, although the absorbent article of this invention was demonstrated based on the preferable embodiment, the absorbent article of this invention is not restrict | limited to the said embodiment, A various change is possible unless the meaning of this invention is impaired.
For example, in the sanitary napkin shown in FIG. 1, an adhesive layer for fixing clothes may be formed on the clothes contact surface of the non-skin contact layer 3.
Moreover, in the sanitary napkin shown in FIG. 1, you may form the adhesive layer for body fixing on the skin contact surface of the said skin contact layer.
Moreover, you may use in the shape of the applicator which preformed the absorbent article of this invention.
The absorbent article of the present invention can also be used as other absorbent articles such as incontinence pads and breast milk pads.

Hereinafter, the absorbent article of the present invention will be described in more detail by way of examples. However, it goes without saying that the present invention is not limited to such examples. Of these examples, Example 1 is within the scope of the present invention, and the other examples are reference examples of the present invention and are outside the scope of the present invention.
In the following description, “part” means part by weight unless otherwise specified.

[Examples 1-7]
A sanitary napkin having the structure shown in FIG. 1 using the members shown in Table 1 and Table 2 as the liquid-permeable skin contact layer, the liquid-impermeable non-skin contact layer, and the liquid-retaining absorbent portion, respectively. Got. On the clothing contact surface of the non-skin contact layer of the sanitary napkin, a hot melt pressure-sensitive adhesive was applied in a stripe shape along the longitudinal direction of the sanitary napkin to form a layer of anti-displacement adhesive.
The sanitary napkin thus obtained was evaluated for fit to the body according to the following criteria. The results are shown in Table 1.

<Fitness of sanitary napkins>
Wearing test by 10 panelists
10 to 8 respondents say they are good ... ◎
7 to 5 respondents answered good ... ○
4 to 3 responded that they were good ... △
2 to 1 responded that they were good… ×

[Comparative Example 1]
Suction heat bond nonwoven fabric made of PE / PP core-sheath composite fiber is used as skin contact layer, porous sheet made of polypropylene resin composition is used as non-skin contact layer, absorbability between two tissue papers A sanitary napkin was obtained in the same manner as in Example 1 except that an absorbent body in which a polymer was sandwiched was used as the absorbent portion. Evaluation similar to Example 1 was performed about the obtained sanitary napkin. The results are shown in Table 1.

  As is apparent from the results shown in Table 1, the sanitary napkin (product of the present invention) of Examples 1 to 7 in which the skin contact layer, the non-skin contact layer, and the absorbent portion were formed from a material that can be structurally deformed, Compared to the sanitary napkin of Comparative Example 1, it can be seen that the fit to the body, particularly the fit to the body, is excellent even when exercising vigorously.

It is a partially broken perspective view which shows the structure of the sanitary napkin as 1st Embodiment of the absorbent article of this invention. It is the partially broken top view which looked at the expansion | deployment type disposable diaper as 2nd Embodiment of the absorbent article of this invention from the skin contact layer side. It is a perspective view which shows the underpants type disposable diaper as 3rd Embodiment of the absorbent article of this invention. It is a perspective view which shows the mounting state of the disposable sanitary shorts as 4th Embodiment of the absorbent article of this invention. It is the expanded view which looked at the state before the assembly of the disposable sanitary shorts shown in FIG. 4 from the skin contact layer side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Liquid-permeable skin contact layer 3 Liquid-impermeable non-skin contact layer 4 Liquid-retaining absorption part 5 Crimp part

Claims (7)

Absorbent article comprising a liquid-permeable skin contact layer, a liquid-impermeable non-skin contact layer, and a liquid-retaining absorbent portion interposed between the skin contact layer and the non-skin contact layer In
The skin contact layer and the non-skin contact layer are formed of a material that can be expanded and / or stretched, and the absorbent portion is an extension and / or extension of the skin contact layer and the non-skin contact layer. It is made of a material that does not hinder expansion and contraction,
The skin contact layer, a hard Elastica tic component of crystalline polypropylene as a first component, Ri Do from the thermoplastic elastomer is formed from a resilient composite fiber to the second component nonwoven,
The content of the first component in the elastic conjugate fiber is 5 to 70% by weight, the content of the second component is 95 to 30% by weight,
And the crystallinity of the crystalline polypropylene of 40% or more, melt index is 3 to 50 g / 10 min, an absorbent article having a weight average molecular weight and wherein the 20,000 to 600,000 der Rukoto.   The absorbent article according to claim 1, wherein the thermoplastic elastomer is an ethylene-α-olefin copolymer produced using metallocene as a catalyst.   The absorbent article according to claim 1, wherein the thermoplastic elastomer is a styrene-based elastomer. The absorptive article according to any one of claims 1 to 3 in which said non-skin contact layer consists of a layered product of an elastic film or an elastic film, and a nonwoven fabric. The absorptive article according to claim 4 in which said elastic film contains the ethylene-alpha-olefin copolymer manufactured using metallocene as a catalyst. The absorbent article according to claim 4 , wherein the stretchable film is made of a nonporous urethane elastomer or ester elastomer and has a moisture permeability of 0.5 g / (100 cm ² · hr) or more. The absorption according to any one of claims 1 to 6 , wherein the absorbent portion is composed of a foam sheet or an extensible nonwoven fabric to which an absorbent polymer is attached, or an extensible nonwoven fabric obtained by directly polymerizing the absorbent polymer on the fiber surface. Sex goods.

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