JP2837419B2 - Non-woven fabric and absorbent articles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a non-woven fabric having excellent thermal adhesiveness and an absorbent article using the non-woven fabric, in particular, disposable sanitary napkins, disposable diapers, cosmetic sheets and the like. The present invention relates to a novel absorbent article.

[Problems to be solved by conventional technology and invention]

Conventional absorbent articles, such as sanitary napkins and disposable diapers, are basically made of cotton-like pulp, absorbent made of absorbent paper, etc., leakproof materials arranged on the lower and side surfaces thereof, and placed on the surface. It is composed of a surface material.

In recent years, with the advanced development of polymer materials, absorbent articles have
New materials, such as superabsorbent polymers and dry nonwovens, have been introduced and the absorption performance has been greatly improved. In particular, for nonwoven fabrics, synthetic fibers, which are extremely effective in improving the feeling of wearing and liquid permeability due to their own flexibility and hydrophobicity, have been widely used in the conventional cellulosic regeneration. Instead of fiber, it has become mainstream as a constituent material of nonwoven fabric. Further, such a synthetic dry nonwoven fabric is not only widely used as a surface material in an absorbent article, but is also being applied to a backing board and a leak-proof paper base conventionally formed of wet paper. At present, not only nonwoven fabrics but also materials for absorbent articles are rapidly being replaced by inexpensive polymer materials that can exhibit various functions.

However, it cannot be said that an absorbent article obtained by combining a polymer material having an excellent function individually exhibits its original function sufficiently in actual use. This is also evident from the fact that the greatest dissatisfaction with absorbent articles such as sanitary napkins, disposable diapers, etc., is still leakage from the wearer's crotch.

The biggest cause of this leakage is that irregular stress is applied to the absorbent article with the movement of the wearer's crotch, and the constituent materials are separated, or the absorbent article is greatly twisted or wrinkled. is there. Among them, in particular, the nonwoven fabric used as the surface material is in direct contact with the wearer's skin and receives a large stress, and is likely to be separated from the waterproof paper or the absorbent. Therefore, it is strongly desired to integrate these by some method.

As a means for integrating the nonwoven fabric and the waterproof paper or the absorbent, it is conceivable to bond them using an adhesive, a hot melt adhesive or the like. However, if such a means is used, the process becomes extremely complicated, and a drastic increase in the cost required for production is desperate. On the other hand, if a so-called thermal bonding method in which the nonwoven fabric is melted and bonded to the object by simple heat and pressure can be performed, the process is less complicated, high-speed production is possible, and the cost required for the production is small.

From the above, in order to improve the leak-proof property of the absorbent article without increasing the cost particularly under the exercise condition of the wearer, a nonwoven fabric having good heat adhesion is absolutely necessary. Furthermore, in order to produce such absorbent articles at high speed, nonwoven fabrics are required to have excellent workability in addition to thermal adhesion. Further, such synthetic fiber nonwoven fabrics having excellent heat processability are used not only for absorbent articles, but also for clothing interlinings, wiper bases, packing materials such as shoes and slippers, and various laminated materials. Therefore, the necessity is increasing.

However, although synthetic fiber nonwoven fabrics in recent years are excellent in softness, drapability, absorption performance, and the like, workability including thermal workability is extremely insufficient. The problems can be broadly classified into the following two. Hereinafter, an absorbent article will be described as an example.

The first problem is that, when the constituent fibers of the nonwoven fabric are specified, there are materials that are extremely difficult to bond depending on the bonding object, and the selection range of the material to be bonded to the nonwoven fabric in forming the entire absorbent article is limited. It is.

Each material of the absorbent article (surface material, absorber, leak-proof material, slip-preventing material, etc.) has a different required function, and a material having physical properties optimal for the required function is selected. In this,
As the leakproof material, waterproofness is required, and a laminated material obtained by laminating a film alone or a base is often used. Further, when importance is placed on the feeling in addition to waterproofness, an ethylene copolymer is often used as a laminate resin. When importance is placed on strength, for example, a polyester resin may be selected. In order to use the absorber efficiently, the leak-proof material is installed near the outside of the absorbent article, and is often used as a back material from just inside the surface material so that it can be bonded to the surface material . For this reason, the surface material is particularly required to have an adhesive property with (the laminate resin of) the leak-proof material. However, on the other hand, the required function of the surface material nonwoven fabric also differs depending on the application, and naturally, the optimum fiber is selected for the requirement. In many absorbent articles, for example, polyolefin fibers are mainly used in applications where flexibility is important, and polyester fibers are mainly used in applications where elasticity is important. Therefore, if a nonwoven fabric of polyolefin fiber is selected, a polyester resin that is difficult to adhere to the polyolefin cannot be used as a laminate resin of the leakproof material. Conversely, if a polyester fiber is selected for the nonwoven fabric, the leakproof material will not be used. As the laminating resin, a polyolefin resin cannot be used, or it can be used only in a range where the adhesive strength is very limited. Further, when a non-polar polyethylene resin is used for the nonwoven fabric, a highly polar ethylene copolymer such as an ionomer resin may not be used because of insufficient adhesive strength.

Among the absorbent articles of the absorbent article, the cushion layer plays a role of absorbing liquid at a high speed, suppressing liquid return during use, and the like, and rayon has been conventionally used in many cases. However, rayon loses bulky properties due to absorption of liquid and has no permanent cushion function. Therefore, it is preferable to use synthetic fibers, and polyethylene terephthalate, which is rich in bulky properties, is particularly preferable. However, synthetic fibers have a drawback that the coefficient of wear is lower than rayon, and the cushion layer itself is distorted during use. Therefore, also in this case, it is desirable that the surface material and the cushion material are integrated by bonding.

 The second problem is that thermal processing of the nonwoven fabric is difficult.

When the nonwoven fabric is made of a fiber that does not melt by heat, such as acrylic fiber, the nonwoven fabric cannot be melted and does not adhere to the object at all. In addition, when the melting temperature is high even when heat-melted, such as polyester and nylon, the processing temperature becomes extremely high, temperature control is difficult, and there is a problem such as large damage when contacting other materials. . Further, even if the non-woven fabric is processed so as to be melted, it is difficult to spread the non-woven fabric.

That is, it is difficult that the melted fiber adheres to the heat sealer due to the heat melting, the heat-bonded portion of the nonwoven fabric is broken, or the resin adheres to the processing machine, and the function of the sealer is deteriorated. Even if the low melting temperature fiber is partially mixed into the nonwoven fabric in order to set the processing temperature to a low level, the situation is exactly the same if the entire low melting temperature fiber is melted. The low melting temperature fiber used in this case is often composed of components having the same melting temperature, such as polypropylene fiber, or a component having a small heat melting temperature difference, such as polyethylene / polypropylene composite fiber, If processing is performed at a temperature that provides sufficient thermal bonding force, all components melt at the same time, and the molten component instantaneously transfers to the sealer, deteriorating the function of the sealer, tearing the thermal bonding part, etc. I do. This problem is exacerbated as the mixing ratio of the low melting temperature fibers in the nonwoven fabric increases. If the mixing ratio of the low melting temperature fibers is low, even if all the components of the low melting temperature fibers are melted by heating, the melting components due to adhesion and entanglement with these fibers in the temperature range where the high melting temperature fibers maintain the fiber form Can be prevented from transferring to the sealer to a certain extent, but not only is the effect of thermal bonding difficult due to the small mixing ratio of the molten component, but the transfer of the molten component to the sealer still remains, and the heat-bonded portion of the nonwoven fabric is broken. In particular, when the processing machine is operated for a long time, damage caused by deposits accumulated on the sealer cannot be essentially solved. In addition, there has been an attempt to improve the above-mentioned problem by using a low melting point polyester / polyester conjugate fiber having a large difference in heat melting temperature as a fiber having a low melting point. In this case, however, the conventional low melting point polyester component is amorphous. Strictly speaking, it does not have a melting temperature (has a softening point) because of its properties. Even at a processing temperature higher than the softening point, the adhesiveness to an object is low, and sufficient sealing strength cannot be obtained.

As an example of difficulty in thermal processing of a nonwoven fabric, there is a limitation on the suitability for lamination when the nonwoven fabric is used as a laminate base. For example, when the nonwoven fabric of the lamination base has a low melting point and a small difference in melting point like polyethylene / polypropylene composite fiber, laminating the resin extruded at a high temperature may cause the base nonwoven fabric to melt. . Further, also in this case, the first problem occurs. That is, when the base nonwoven fabric and the laminated resin are made of a resin that is hardly compatible with each other, delamination between the laminated resin and the base nonwoven fabric is likely to occur.

From the above, as described in the first problem, the conventional thermal processing on the synthetic fiber-based nonwoven fabric can be performed only in a very limited range of the bonding object, and the second problem is described. As described above, in particular, heat processing that exhibits a stable effect on a nonwoven fabric having a very high mixing ratio of low melting temperature fibers used as a binder, such as a dry heat-bonded nonwoven fabric widely used in absorbent articles, is not possible. Is possible and therefore
Fully utilize the function of non-woven fabric and other materials, especially leakproof material,
Moreover, the entire absorbent article was less likely to curl and wrinkle, and could not be provided with an absorbent article rich in leakproofness.

[Means for solving the problem]

The present inventors have conducted intensive studies to solve the above problems, and as a result, it is possible to select a bonding object in a wide range, and have industrially sufficient heat workability, and furthermore, strength which is a function originally required. The present inventors have found a nonwoven fabric having good absorption performance, texture, drapability, and the like, and have further found an absorbent article having a small amount of curl and good absorbability using this nonwoven fabric, thereby completing the present invention.

That is, the present invention includes a conjugate fiber comprising first and second portions satisfying the following properties (A) and (B), wherein the second portion forms at least a part of the surface of the fiber. A nonwoven fabric characterized by the above feature and an absorbent article characterized by using the nonwoven fabric.

(A) The first portion is mainly composed of a resin having a melting temperature of 200 ° C. or higher.

(B) The second portion has a resin whose melting temperature is at least 50 ° C. lower than the main component resin of the first portion (hereinafter referred to as a main component) and a resin having high compatibility with an object to be bonded (hereinafter referred to as a blend component). )
Are homogeneously dispersed, and when the main component and the blend component are described by the main component / blend component, HDPE / lmpPE
T, HDPE / EEA, HDPE / EVA, HDPE / EAA, HDPE / ionomer resin, lmpPET / EAA, LLDPE / lmpPET, LDPE / lmpPET, MDPE /
It is selected from a combination of lmpPET and PP / lmpPET.

The nonwoven fabric of the present invention must satisfy at least the following conditions for thermal processing.

That is, at least a part of the nonwoven fabric is melted by the heat and pressure and efficiently adheres to the object. The "second portion" of the nonwoven fabric of the present invention plays a role of being melted by this hot pressure. This is self-evident in view of this purpose, but in consideration of the first problem described in the preceding section, it is necessary to proceed as follows in somewhat more detail.

The mechanism in which at least a part of the nonwoven fabric is melted and thermally bonded to the object is a combination of the following two effects.

(1) The melted resin of the non-woven fabric or a part of the object that has been melted together is a sheet skeleton of each other (the non-woven fabric side is an unfused fiber aggregate portion; the object side, for example, the base fiber in the case of laminated paper) The so-called "anchor effect" that flows into and diffuses into the collective sheet.

(2) The melted resin of the non-woven fabric has a strong affinity at the molecular level for the object, and wets well on the surface of the object, or mixes well with the object melted together. The "compatibility effect" of melting.

These two effects must be exhibited simultaneously for efficient bonding. Of the above effects, the anchoring effect always occurs as long as the resin on the non-woven fabric is melted, but the compatibility effect works effectively only when the fiber resin on the non-woven fabric is determined and with a very limited range of objects to be bonded. Only between. Therefore, efficient bonding is not performed to a material other than the limited range, and the first problem pointed out in the preceding section occurs.

Therefore, the present inventors consider that it is a guideline for solving the first problem that the anchor effect and the compatibility effect simultaneously work effectively when the nonwoven fabric is thermally bonded. Solution was found.

That is, a resin component (hereinafter, referred to as a composite resin, which means the “second portion” of the nonwoven fabric of the present invention) blended with a resin having high compatibility with the object to be bonded (hereinafter, referred to as a blend component) is at least partially included. In other words, the non-woven fabric is constituted by the fibers containing the non-woven fabric. Since the blend component is preferably melted at the same time as the component excluding the blend component of the composite resin (hereinafter, referred to as the main component) during heating, the melting temperature of the blend component is higher than the melting temperature of the main component of the composite resin. Do not rise above 30 ° C. Desirably, the melting temperature of the main component of the composite resin is substantially the same or lower. However, the melting temperature referred to here means a temperature at which the resin starts to substantially produce an adhesive effect by heating, and corresponds to a melting point for a crystalline resin and a thermal softening point for an amorphous resin. Since the blend components need to be compatible with the object with a large adhesion area, they must be dispersed as uniformly and finely as possible in the composite resin (hereinafter, this state is referred to as a uniformly dispersed state). ). The degree of dispersion is desirably such that the vertical diameter of the phase cross section in the direction perpendicular to the fiber is 1 μm or less, and in some cases, the phase components of the blend component are compatible with each other until a phase separation structure is hardly recognized. May be. When the blending ratio of the blend components in the composite resin is at least 5% by weight, the effect is often exhibited, but the optimum value can be determined depending on the application. If the mixing ratio is too high, the original function of the resin as the main component is impaired.

Next, considering the second problem summarized in the preceding section, it is understood that the nonwoven fabric used in the absorbent article of the present invention must further satisfy the following conditions for thermal processing.

The first condition is that the nonwoven fabric component melted by hot pressure does not migrate to the sealer. The second condition is that the above two conditions can be implemented in a wide temperature range.
In particular, as described in detail in the second problem in the previous section, the first and second conditions are extremely important requirements for performing stable thermal processing in actual production.

As a result of further consideration of these conditions, the present inventors have found that the above conditions can be imparted to the nonwoven fabric by the following method.

A method for preventing the transfer of the nonwoven fabric component to the sealer and the tearing of the bonded portion will be described. For this, a fiber that does not cause all the resin components to be melted by heat and pressure may be used. That is, the second portion is melted with an appropriate fluidity during the heat bonding, but the first portion is not melted, and as a whole, the fiber formation is maintained and the composite fiber is used as a nonwoven fabric skeleton. is there. In order to reliably realize such an effect within the range of the thermal bonding temperature and the line variation in actual production, the melting temperature of the main component resin of the first portion and the melting temperature of the main component resin of the second portion are required. The difference must be at least 50 ° C. or more, preferably 100 ° C. or more. Further, in such a conjugate fiber, as the melting temperature of the main component resin of the first portion is higher, the thermal processing can be performed in a wider temperature range. From the above, in order to satisfy the first condition, it is necessary that at least one layer of the nonwoven fabric contains the conjugate fiber composed of the first portion and the second portion. Desirably, it is contained in the surface layer. Further, as the mixing ratio increases, the adhesive strength increases without causing breakage of the heat-processed bonded portion or welding to the sealer, and the heat-processability of the nonwoven fabric improves.

In order for the nonwoven fabric of the present invention to satisfy the second condition required for thermal processing, it is sufficient that the nonwoven fabric is bonded by thermal processing at a temperature as low as possible and does not adhere to the sealer as high as possible. That is,
The melting temperature of the first portion of the conjugate fiber according to the present invention should be as high as possible and the melting temperature of the second portion should be as low as possible. Preferably, the melting temperature of the first portion is 200 ° C.
As described above, it is necessary that the melting temperature of the second part is lower than the melting temperature of the first part by 50 ° C. or more.

Here, the first portion of the conjugate fiber according to the present invention will be supplemented. This first part has the aforementioned thermal properties, namely
It suffices that the melting temperature is 200 ° C. or higher and at least 50 ° C. higher than the second portion, but it is denied that the first portion is a blend of two or more resin components. Not something. However, at least the resin as the main component satisfies the thermal characteristics, and the degree of blending must be suppressed within a range in which the first portion remains the fiber skeleton even after thermal processing and the first and second conditions are satisfied. Must. For this purpose, the weight ratio of the main component resin in the first portion is desirably at least 50% or more, and most preferably 100% in terms of thermal processing.

The compounding ratio of the first part and the second part in the conjugate fiber according to the present invention is preferably 3: 7 to 6: 4 by weight.

Next, specific examples of the resin constituting the composite fiber according to the present invention will be described.

As the main component resin of the first part, polyester resins [polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc.], polyamide resins (6,6
6-nylon, etc.) and polyacrylic resin.

When the main component resin and the blend component of the second part are described as the main component / blend component, the high-density polyethylene resin (HDPE) / low melting point polyester resin (lmpPET), HDPE
/ Ethylene-ethyl acrylate copolymer (EEA), HDPE /
Ethylene-vinyl acetate copolymer (EVA), HDPE / ethylene-acrylic acid copolymer (EAA), HDPE / ionomer resin, lmpPET / EAA, linear low-density polyethylene resin (LLDP)
E) / lmpPET, low density polyethylene resin (LDPE) / lmpPE
T, selected from the combination of medium density polyethylene resin (MDPE) / lmPET and polypropylene resin (PP) / lmpPET.

The method for forming the nonwoven fabric with the above composite fibers is not particularly limited. Typical methods include air needling, water needling, needle punching, which forms a stable sheet by entanglement of a fibrous web, binder bonding, which fixes the web with an adhesive or melting of the fiber itself, and thermal bonding. Examples include an adhesion method, a spunbond method of forming a sheet with filament fibers, and a wet method of forming a sheet with papermaking.

Usually, the nonwoven fabric formed by these methods has a single-layer or multi-layer structure. If at least one layer contains the conjugate fiber according to the present invention, the heat-bonding property of the nonwoven fabric is improved. It is preferably contained in the layer facing the side, and most preferably contained in each layer.

The effect is exhibited if the weight ratio of the conjugate fiber in the nonwoven fabric is 10% or more, but more preferably, it is in the range of 30 to 100% on average. The basis weight of the nonwoven fabric is, for example, when used for sanitary napkins, 10 to 40 g /
m ² , of which the surface layer is 5 to 15 g / m ² , when used for disposable diapers, the total is 15 to 50 g / m ² , of which the surface layer is 7 to
It is desirable to be in the range of 20 g / m ² .

Finally, in order for the absorbent article to have an appropriate absorbency, it is preferable that the nonwoven fabric has an appropriate hydrophilic property, and therefore, it is more preferable that at least the surface of the conjugate fiber according to the present invention is hydrophilic. . As the surface hydrophilization method, for example, the surface of the conjugate fiber is hydrophilized by a surfactant treatment, or a chemical surface that chemically bonds a chemical substance having a hydrophilic group such as a monomer having a hydrophilic group or a polymer having a hydrophilic group. Reforming or plasma processing,
The surface may be made hydrophilic by subjecting it to physical surface modification such as kneading a chemical substance having a hydrophilic group. In the chemical surface modification, a chemical substance having a hydrophilic group may be chemically bonded to the fiber surface, or a chemical substance having a hydrophilic group may be bonded and crosslinked to cover the fiber surface. As described above, the method of hydrophilizing in the fiber manufacturing process is generally used.However, as another example, a nonwoven fabric is prepared, and the above-mentioned chemical or physical surface modification or surfactant treatment is performed as post-processing. Thus, hydrophilicity may be imparted to the surface of the conjugate fiber according to the present invention.

When the nonwoven fabric of the present invention is formed into a disposable absorbent article as described in detail in the examples, the conventional nonwoven fabric exhibits a small degree of deterioration and therefore exhibits excellent absorption performance.

The nonwoven fabric of the present invention includes sanitary napkins, disposable diapers, disposable absorbent articles such as cosmetic sheets, as well as clothing interlining, wiper bases, packing materials such as shoes and slippers,
It has been found that when applied to various laminate materials, a wider range of materials can be selected, and the quality of each product is greatly improved.

〔Example〕

Next, an absorbent article heat-processed using the nonwoven fabric according to the present invention will be described in more detail with reference to examples.

Examples 1 to 17 and Comparative Examples 1 to 11 Nonwoven fabrics shown in Tables 2 to 4 were produced using various composite fibers shown in Table 1, and absorbent articles were produced using the obtained nonwoven fabrics.

The nonwoven fabric was manufactured by a thermal bonding method using the fibers of the second part as binder fibers (fixed by passing hot air of 140 ° C. through the card web to fuse the fibers of the second part with other fibers). The nonwoven fabric A as an object is a card web made of a polyester fiber which is made into a sheet by performing needle punching, and the laminated papers A to F are laminated papers of water-repellent paper and various resin films.

Absorbent articles, Examples 1-9, Example 16, Comparative Examples 1
3. In Comparative Example 10, except for the nonwoven fabric and rayon cotton of a commercially available sanitary napkin (trade name: Laurier (manufactured by Kao Corporation)), the nonwoven fabrics listed in Tables 2 and 4 and (in place of rayon cotton) were used. ) On which nonwoven fabric A was placed. Example 10
-15, Example 17, Comparative Examples 4-9 and Comparative Example 11, Table 3 was used instead of the nonwoven fabric and the back material of a commercially available sanitary napkin (trade name: Lorisafety Long (manufactured by Kao Corporation)). And the nonwoven fabric and the laminated paper listed in Table 4 were mounted on the substrate and manufactured. Sealing was performed as follows.

The melting temperature of the fibers used and the physical properties of the obtained nonwoven fabric and the absorbent article were measured by the following methods. The results are also shown in Tables 1 to 4.

The adhesive strength and sealability were measured after the following seal processing was performed on the nonwoven fabric and the nonwoven fabric A or the nonwoven fabric and the laminated paper. The same sealing process was also performed on the absorbent article, and the dynamic absorption was measured after the nonwoven fabric and the nonwoven fabric A or the nonwoven fabric and the laminated paper were integrated.

(1) Melting temperature The fibers listed in Table 1 were measured by the following method. That is
Using a DSC (differential scanning calorimeter), the temperature of the endothermic peak observed when the temperature of the sample was raised by 10 ° C. per minute was defined as the melting temperature. For fibers that do not have a distinct melting temperature, TMA
The sample was compressed under a constant load by a thermomechanical tester, and the maximum differential coefficient with time of the amount of thermal deformation observed when the sample was heated at 5 ° C./min was defined as the melting temperature.

(2) Blend state The cross section of the fiber is observed with an electron microscope, and the blend state of the resin in the second portion is evaluated.

Tertiary: blend components are uniformly dispersed, and each phase section is 1 μm or less.

Secondary: The blend components are uniformly dispersed, but there are also phase cross sections of 1 μm or more.

1st class: Dispersion is non-uniform, and phase cross section varies widely. Spinning is extremely difficult.

(3) Sealing The nonwoven fabric of Table 2 or Table 4 and nonwoven fabric A, and the nonwoven fabric of Table 3 or Table 4 and laminated paper are heat-sealed with a seal width of 2 mm while flowing at a line speed of 30 m / min.

(4) Sealability The seal was evaluated by observing the seal with the naked eye. The evaluation criteria are as follows.

Third grade: No break in the heat-bonded portion, no adhesion to the sealer.

2nd class… There are some places where tearing or adhesion is incomplete,
No adhesion to sealer.

Class 1: The heat-bonded portion is broken and adheres to the sealer.

(5) Adhesive strength A test piece 1 having a width of 30 mm including a seal portion 2 as shown in FIG. 1 was cut out from the sample after sealing, and the end of the nonwoven fabric 3 and the nonwoven fabric A or the laminated paper 4 were cut out as shown in FIG. The maximum peeling load when each end is gripped and pulled by the chuck 5 is defined as the adhesive strength.

(6) Dynamic absorption amount The measurement sample 7 of the absorbent article is set on the movable female waist model 6 as shown in FIG. 3 as shown in FIG. Tube 8
From the test solution at a rate of 15 g / min, and the amount of test solution injected at the time when leakage is confirmed is defined as the dynamic absorption amount. It can be said that the larger the amount of dynamic absorption, the less likely it is to leak.

(7) Distorted state after use After measuring the dynamic absorption of the absorbent articles of Tables 2 to 4,
The cushion material (nonwoven fabric A) or the state of the laminated paper was observed.

3rd grade: No leakage and hard to leak.

Class 2 ... Some leakage, but no significant reduction in absorption.

1st grade: Distorted, the absorption amount is greatly reduced.

[Effects of the Invention] As can be seen from Examples 1 to 17, the nonwoven fabric according to the present invention enables the adhesion to the target material, which was difficult to adhere, by using fibers made of a composite resin. Fixes PET-type cushioning material that was easy to twist, preventing twisting,
An absorbent article having excellent absorbency and a softer and softer feel could be formed.

Comparative Examples 1 and 2 and Comparative Examples 4 to 11 all have a low adhesive strength to the object, and can be seen to be impractical when worn on a human body and walked to remove the seal. Comparative Example 3 shows that F
Sealing cannot be performed because the melting temperature difference between the core / sheath of −20 and 50 ° C. or less.

By selecting the absorbent articles of Examples 10 to 15 and Example 17 as a blend component of the composite fiber of the nonwoven fabric with a resin having high compatibility with the resin constituting the laminated paper, without changing the original shape / performance of the nonwoven fabric In addition, the adhesive strength to the laminated paper was improved, and the amount of dynamic absorption of Comparative Examples 4 to 9 and 11 having insufficient adhesive strength was greatly exceeded.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sample for measuring adhesive strength, FIG. 2 is a perspective view showing a state at the time of measurement, FIG. 3 is a perspective view of a movable female waist model for measuring dynamic absorption, and FIG. FIG. 4 is a diagram showing a state in which a measurement sample is set in the model. DESCRIPTION OF SYMBOLS 1 ... Test piece 2, ... Seal part 3 ... Non-woven fabric 4 ... Non-woven fabric A or laminated paper 5 ... Chuck, 6 ... Movable female waist model 7 ... Measurement sample, 8 ... Tube

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takatoshi Kobayashi 3009-1 Imaizumi, Utsunomiya City, Tochigi Prefecture (56) References JP-A-63-147460 (JP, A) JP-A-56-9458 (JP, A) Kaisho 63-227814 (JP, A)

Claims (2)

(57) [Claims] 1. A first material satisfying the following characteristics (A) and (B):
And a second portion, wherein the second portion comprises bicomponent fibers forming at least a portion of the surface of the fiber. (A) The first portion is mainly composed of a resin having a melting temperature of 200 ° C. or higher. (B) The second portion has a resin whose melting temperature is at least 50 ° C. lower than the main component resin of the first portion (hereinafter referred to as a main component) and a resin having high compatibility with an object to be bonded (hereinafter referred to as a blend component). )
Are homogeneously dispersed, and when the main component and the blend component are described by the main component / blend component, HDPE / lmpPE
T, HDPE / EEA, HDPE / EVA, HDPE / EAA, HDPE / ionomer resin, lmpPET / EAA, LLDPE / lmpPET, LDPE / lmpPET, MDPE /
It is selected from a combination of lmpPET and PP / lmpPET. 2. An absorbent article using the nonwoven fabric according to claim 1.