JP2012036528A - Sheet material for absorbent article and absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet material for an absorbent article that is used as a component member of an absorbent article, has an excellent shielding property against contamination and is capable of efficiently absorbing a solid matter and a dissolved matter contained in body fluid without impairing an excellent use feeling, and to provide an absorbent article comprising the sheet material.SOLUTION: A sheet material for an absorbent article used as a component member of an absorbent article is obtained by using a polyester fiber having a micropore on a fiber surface.

Description

  The present invention is an absorbent article sheet material used as a constituent member of an absorbent article, and has excellent shielding properties against dirt without impairing an excellent feeling of use, and is contained in a body fluid. The present invention relates to an absorbent article sheet material capable of adsorbing solids and dissolved substances with good performance, and an absorbent article using the sheet material.

  Absorbent articles such as paper diapers and sanitary napkins are usually composed of an absorbent that absorbs bodily fluids and a sheet material that covers the absorbent (see, for example, Patent Document 1). Further, the properties required for such an absorbent article include an excellent feeling of use, an excellent shielding property against dirt, and an adsorbability of solids and dissolved substances contained in body fluids.

On the other hand, for example, Patent Document 2 proposes that an absorbent article is configured using a film-like sheet material containing a large amount of a matting agent.
However, in such an absorbent article, since the film-like sheet material does not have a capillary structure, there is a problem that there is a feeling of stuffiness and stickiness and the feeling of use is inferior. In addition, there is a problem that solids and dissolved substances contained in the body fluid are difficult to be adsorbed.

JP-A-57-205506 JP-A 61-45753

  The present invention has been made in view of the above-mentioned background, and the object thereof is an absorbent article sheet material used as a constituent member of an absorbent article. It is to provide a sheet material for absorbent articles having excellent shielding properties and capable of adsorbing solids and dissolved substances contained in body fluid with good performance, and an absorbent article using the sheet material. .

  As a result of diligent study to achieve the above-mentioned problems, the present inventor constituted a sheet material for absorbent articles with polyester fibers having fine pores on the fiber surface, without impairing excellent use feeling, and against stains. By discovering that it is possible to obtain a sheet material and an absorbent article for absorbent articles that have excellent shielding properties and that can adsorb solids and dissolved substances contained in body fluids with good performance, and through further intensive studies The invention has been completed.

Thus, according to the present invention, “absorbent article sheet material used as a constituent member of an absorbent article, comprising polyester fibers having fine pores on the fiber surface”. Is provided.
In that case, it is preferable that the width | variety of a micropore is 0.001 micrometer or more in the said micropore. Moreover, it is preferable that the said micropore is a micropore obtained by removing at least 1 part of polyester containing the micropore formation agent represented by a following formula.

（式中、ＭおよびＭ’は金属であり、アルカリ土類金属、マンガン、コバルト、亜鉛が好ましく、ＭおよびＭ’は同一でもあるいは異なっていてもよい。Ｒは水素原子またはエステル形成性官能基であり、ｎは１または２を示す。）

(In the formula, M and M ′ are metals, preferably alkaline earth metals, manganese, cobalt, and zinc, and M and M ′ may be the same or different. R is a hydrogen atom or an ester-forming functional group. And n represents 1 or 2.)

In this invention, it is preferable that the said polyester fiber is a hollow fiber and the said micropore is connected to the hollow part. Further, it is preferable that a polymer having a melting point lower by 40 ° C. or more than the polymer constituting the polyester fiber includes a heat-adhesive conjugate fiber disposed on the surface as a heat-fusion component. In that case, it is preferable that the weight ratio of the said polyester fiber and a heat bondable composite fiber exists in the range of 10: 90-50: 50 (the former: latter). Moreover, it is preferable that the sheet | seat material for absorbent articles is a nonwoven fabric. Moreover, it is preferable that a fabric weight is in the range of 12 to 70 g / m ² . The thickness is preferably in the range of 1 to 9 mm. Moreover, it is preferable that a density exists in the range of 0.005-0.01 g / cm < ³ >.
Moreover, according to this invention, the absorbent article containing the said sheet | seat material is provided. In that case, it is preferable that this absorbent article is for absorbing a bodily fluid.

  According to the present invention, it is a sheet material for absorbent articles that is used as a constituent member of an absorbent article, has an excellent shielding property against dirt without impairing an excellent feeling of use, and in body fluids The sheet | seat material for absorbent articles which can adsorb | suck the contained solid substance and melt | dissolution material with sufficient performance, and the absorbent material which uses this sheet | seat material are obtained.

Hereinafter, embodiments of the present invention will be described in detail.
Since the sheet material for absorbent articles of the present invention contains polyester fibers having fine pores on the fiber surface, light is irregularly reflected by the effect of such fine pores, and thus has excellent shielding properties against dirt. At the same time, solids and dissolved substances contained in the body fluid are adsorbed with good performance into the fine pores.

Here, the fine holes are preferably fine holes having a width (inscribed circle diameter of the fine holes) of 0.001 μm or more. In particular, the fine pores have a width of 0.001 to 3 μm (particularly preferably 0.01 μm) in order to adsorb solid substances and dissolved substances contained in body fluids with excellent shielding performance against dirt. It is preferable to be within a range of ˜2 μm. Further, the length of the fine holes (the circumscribed circle diameter of the fine holes) is preferably in the range of 3 to 50 times the width.
In addition, what is necessary is just to measure about arbitrary micropores about the said width | variety and length. When there are a plurality of micropores on the fiber surface, it is particularly preferable that the width of all the micropores is 0.001 μm or more as measured by n number 10.

  The polyester forming the polyester fiber is produced from a dicarboxylic acid component and a diglycol component. As the dicarboxylic acid component, terephthalic acid is preferably used mainly, and as the diglycol component, it is preferable to use one or more alkylene glycols selected from ethylene glycol, trimethylene glycol and tetramethylene glycol. Moreover, the polyester resin may contain a third component in addition to the dicarboxylic acid component and the glycol component. Examples of the third component include cationic dye dyeable anion components such as sodium sulfoisophthalic acid; dicarboxylic acids other than terephthalic acid such as isophthalic acid, naphthalenedicarboxylic acid, adipic acid, sebacic acid; and glycol compounds other than alkylene glycol. For example, one or more of diethylene glycol, polyethylene glycol, bisphenol A, and bisphenol sulfone can be used. Such polyester may be material recycled or chemically recycled polyester, or polyethylene terephthalate, polylactic acid, or stereocomplex polylactic acid using a monomer component obtained using biomass, that is, a biological material as a raw material. Furthermore, the polyester obtained using the catalyst containing the specific phosphorus compound and titanium compound which are described in Unexamined-Japanese-Patent No. 2004-270097 and 2004-21268 may be sufficient. In particular, in forming the micropores as described above, a polyester containing a sulfonic acid metal salt (micropore forming agent) represented by the following formula is particularly preferable.

（式中、ＭおよびＭ’は金属であり、アルカリ土類金属、マンガン、コバルト、亜鉛が好ましく、ＭおよびＭ’は同一でもあるいは異なっていてもよい。Ｒは水素原子またはエステル形成性官能基であり、ｎは１または２を示す。）

(In the formula, M and M ′ are metals, preferably alkaline earth metals, manganese, cobalt, and zinc, and M and M ′ may be the same or different. R is a hydrogen atom or an ester-forming functional group. And n represents 1 or 2.)

  Here, as the sulfonic acid metal salt, specifically, sodium 3-carbomethoxybenzenesulfonate-5-carboxylate, sodium 3-carbomethoxybenzenesulfonate-5-carboxylate, 3-carbomethoxybenzenesulfone Potassium acid-5-carboxylate, sodium 3-carboxybenzenesulfonate-5-carboxylate sodium, 3-hydroxyethoxycarbonylbenzenesulfonate sodium-5-carboxylate 1 / 2magnesium, sodium benzenesulfonate-3,5 -Magnesium dicarboxylate 1/2 and the like can be mentioned. The said sulfonic acid metal salt may be used individually by 1 type, or may use 2 or more types together.

  If the addition amount of the micropore forming agent is small, the polyester fiber finally obtained has a reduced shielding property against dirt and the adsorptivity of solids and dissolved substances contained in body fluids. Since it becomes easy to generate | occur | produce, the range of 0.5-5 mol% is preferable with respect to the acid component which comprises polyester.

  After spinning and drawing by a conventional method using polyester containing the micropore-forming agent, then, if necessary, after cutting to a predetermined length or crimping as described below, an aqueous solution of an alkali compound By removing at least one part of the polyester, a polyester fiber having fine pores on the fiber surface as described above can be obtained.

  At that time, it is most preferable to form a polyester fiber only with the polyester containing the micropore-forming agent, but a core-sheath type or side-by-side type composite fiber (conjugate fiber) containing the polyester containing the micropore-forming agent as one component. ).

  Examples of the alkali compound used include sodium hydroxide, potassium hydroxide, tetramethylammonium hydroxide, sodium carbonate, potassium carbonate and the like. Of these, sodium hydroxide and potassium hydroxide are particularly preferred. The concentration of the aqueous solution of the alkali compound varies depending on the type of alkali compound, processing conditions, etc., but is usually preferably in the range of 0.01 to 40% by weight, particularly preferably in the range of 0.1 to 30% by weight. The treatment temperature is preferably from room temperature to 100 ° C., and the treatment time is usually from 1 minute to 4 hours. Thus, by treating with an aqueous solution of an alkali compound, the polyester is selectively eluted together with the sulfonic acid metal salt, and a large number of fine pores communicating with the outside can be formed not only on the fiber surface but also on the fiber inner surface. . The alkali weight loss rate of the polyester fiber is preferably 10 to 40% by weight (more preferably 15 to 35% by weight) relative to the weight of the polyester fiber before the alkali weight reduction treatment. If the alkali weight loss rate is less than 10% by weight, the shielding property against dirt and the adsorptivity of solid matter and dissolved matter contained in the body fluid may be lowered. Conversely, if the alkali weight loss rate is greater than 40% by weight, the fiber damage due to the alkali weight loss treatment is large, and there is a possibility that the card passing property is deteriorated, the occurrence of scum, and fibrillation when producing a nonwoven fabric. .

  In such a polyester fiber, the cross-sectional shape of the single fiber may be any of ordinary round shape, flat shape, flat shape with constriction such as flattened shape, triangular shape and polygonal shape, hollow shape such as round hollow shape, triangular hollow shape and square hollow shape. In particular, when the cross-sectional shape of the single fiber is hollow and the micropores communicate with the hollow portion, the shielding property against dirt and the adsorptivity of solid matter and dissolved matter contained in body fluid are further improved. preferable.

  In the polyester fiber, the single yarn fineness is preferably 0.0001 to 10 dtex (more preferably 0.1 to 10 dtex, particularly preferably 1 to 5 dtex). If the single yarn fineness is smaller than 0.0001 dtex, it may be difficult to form micropores on the fiber surface. On the contrary, if the single yarn fineness is larger than 10 dtex, not only the shielding property against dirt and the adsorptivity of solid substances and dissolved substances contained in body fluids are deteriorated, but also the feeling of use of the absorbent article is impaired. There is a fear.

  The polyester fiber may be a long fiber that is not cut, but has a fiber length of 3 to 100 mm (more preferably 25 to 75 mm, particularly preferably 30 to 70 mm). And the adsorptivity of the solid matter and dissolved matter contained in the body fluid is further improved, which is preferable.

  When the polyester fiber is a short fiber, when the crimp is applied, the bulkiness of the sheet material for absorbent articles is improved, so that the shielding property against dirt and the solid or dissolved matter contained in the body fluid The adsorptivity is further improved, which is preferable. At that time, the number of crimps is preferably 3 to 40 pieces / 2.54 cm (preferably 7 to 15 pieces / 2.54 cm), and the crimp rate is preferably 20 to 40%.

  As a crimping method, a spiral crimp is applied using a composite fiber in which polymers having different heat shrinkage rates are bonded to a side-by-side type, a spiral crimp is applied by anisotropic cooling, and a normal indentation crimper method is used. Various methods such as imparting mechanical crimp may be used, but it is optimal to impart mechanical crimp from the viewpoints of bulkiness and manufacturing cost.

  In the sheet material for absorbent articles of the present invention, the sheet material may be composed only of the polyester fiber, but by improving the bulkiness of the sheet material, the shielding property against dirt and the solid contained in the body fluid In order to further improve the adsorptivity of the product and dissolved matter, the polyester fiber and a polymer having a melting point lower by 40 ° C. or more than the polymer constituting the polyester fiber are disposed on the surface as a heat fusion component. It is preferably composed of an adhesive conjugate fiber.

  In such a heat-adhesive fiber, polymers arranged as a heat-adhesive component include polyurethane elastomers, polyester elastomers, inelastic polyester polymers and copolymers thereof, polyolefin polymers and copolymers thereof, polyvinyl alcohol And the like.

  Here, as the polyurethane-based elastomer, a low-melting-point polyol having a molecular weight of about 500 to 6000, such as dihydroxy polyether, dihydroxy polyester, dihydroxy polycarbonate, dihydroxy polyester amide, and the like, and an organic diisocyanate having a molecular weight of 500 or less, such as p, p'- Diphenyl methane diisocyanate, tolylene diisocyanate, isophorone diisocyanate hydrogenated diphenyl methane isocyanate, xylylene isocyanate, 2,6-diisocyanate methyl caproate, hexamethylene diisocyanate and the like, and chain extenders having a molecular weight of 500 or less, such as glycol amino alcohol Or the polymer obtained by reaction with a triol is preferable.

  In addition, as a polyester-based elastomer, a polyetherester copolymer obtained by copolymerizing thermoplastic polyester as a hard segment and poly (alkylene oxide) glycol as a soft segment, more specifically, terephthalic acid, isophthalic acid, phthalic acid Alicyclic dicarboxylic acids such as naphthalene-2,6-dicarboxylic acid, naphthalene-2,7-dicarboxylic acid, diphenyl-4,4′-dicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, succinic acid, oxalic acid, At least one dicarboxylic acid selected from aliphatic dicarboxylic acids such as adipic acid, sebacic acid, dodecanedioic acid, dimer acid, or ester-forming derivatives thereof, 1,4-butanediol, ethylene glycol trimethylene glycol, Tetramethylene glycol, Aliphatic diols such as tamethylene glycol, hexamethylene glycol neopentyl glycol, decamethylene glycol, or alicyclic diols such as 1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane methanol, or the like At least one diol component selected from ester-forming derivatives and the like, and polyethylene glycol, poly (1,2- and 1,3-polypropylene oxide) glycol, poly (tetramethylene oxide) having an average molecular weight of about 400 to 5000 ) Consists of at least one of poly (alkylene oxide) glycols such as glycols, copolymers of ethylene oxide and propylene oxide, copolymers of ethylene oxide and tetrahydrofuran, etc. It can be mentioned terpolymer.

  The copolyester polymers include aliphatic dicarboxylic acids such as adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or hexahydroterephthalic acid and hexahydroisophthalic acid. Contains a predetermined number of alicyclic dicarboxylic acids and aliphatic and alicyclic diols such as diethylene glycol, polyethylene glycol, propylene glycol, and paraxylene glycol, and oxyacids such as parahydroxybenzoic acid are added as desired. Examples thereof include polyesters obtained by adding and copolymerizing isophthalic acid and 1,6-hexanediol in terephthalic acid and ethylene glycol.

Examples of the polyolefin polymer include low density polyethylene, high density polyethylene, and polypropylene.
In addition, various stabilizers, ultraviolet absorbers, thickening branching agents, matting agents, coloring agents, other various improving agents, and the like may be blended in the above-described polymer as necessary.

  In the thermal adhesive fiber, the polymer disposed on the counterpart component is not particularly limited as long as the polymer has a melting point higher than that of the polymer disposed on the thermal adhesive component and the melting point is 200 ° C. or higher, Polyethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate, polyethylene naphthalate, polypivalolactone, polytrimethylene terephthalate, polylactic acid (PLA), stereocomplex poly Polyesters such as lactic acid (PLA) are preferred.

  Moreover, in the said heat bondable fiber, what a heat bondable component occupies at least 1/2 of the surface area is preferable. It is appropriate that the weight ratio of the heat-adhesive component and the counterpart component is in the range of 30/70 to 70/30 as a composite ratio. The form of the heat-adhesive fiber is not particularly limited, but is preferably a composite fiber (conjugate fiber) in which the heat-adhesive component and the counterpart component are arranged in a side-by-side type or a core-sheath type, more preferably a core-sheath. It is a type. In this core-sheath type heat-adhesive fiber, the counterpart component is the core and the heat-adhesive component is the sheath, but the core may be concentric or eccentric.

In such a heat-bondable fiber, the single yarn fineness and fiber length are preferably the same as those of the polyester fiber. Moreover, it is preferable that the same crimp as the case of the said polyester fiber is provided.
The polyester fiber or the heat-adhesive fiber is substantially a hydrophobic fiber, but the surface of the fiber is added with a surfactant or oil in consideration of wettability and processability. It is preferable.

  In the sheet material for absorbent articles of the present invention, the sheet structure is not particularly limited, and any of woven fabrics, knitted fabrics, and nonwoven fabrics (for example, airlaid nonwoven fabrics, wet nonwoven fabrics, dry nonwoven fabrics, spunbond nonwoven fabrics, etc.) can be used. In order to further improve the shielding property against dirt and the adsorptivity of solid matter and dissolved matter contained in the body fluid, a nonwoven fabric is preferable. Among them, the polyester crimped short fibers and the heat-adhesive composite short fibers are mixed and heat-treated, whereby the heat-adhesive composite short fibers are heat-sealed in a crossed state and / or Particularly preferred is a fiber structure in which the heat-bonding composite short fibers and the polyester crimped short fibers intersect with heat-bonded fixing points.

  The sheet material for absorbent articles of the present invention can be produced, for example, by the following production method. First, using the polyester containing the micropore forming agent, after spinning and stretching by a conventional method, then after cutting to a predetermined length or crimping as described below, if necessary, By treating such an aqueous solution of an alkali compound and removing at least one part of the polyester, the above-described polyester fiber having fine pores on the fiber surface is obtained.

  Subsequently, the polyester fiber is used alone, or preferably by using the polyester fiber and the heat-adhesive fiber as described above, and further using other fibers as necessary, and then weaving by a normal loom or knitting machine. The knitted fabric may be knitted and knitted. Alternatively, the above-mentioned polyester crimped short fibers and heat-bondable composite short fibers may be blended so that the weight ratio (the former / the latter) is 90/10 to 10/90 (preferably 50/50 to 10/90). After the prepared web is heated, the fixing point and / or the heat-adhesive composite short fiber and the polyester crimped short fiber heat-sealed in a state where the heat-adhesive composite short fibers intersect with each other are heated. You may obtain the fiber structure (nonwoven fabric) in which the fixing points heat-sealed in the crossing state are scattered.

  At that time, the web may be heated as it is, or in order to arrange the fibers constituting the fiber structure in the fiber thickness direction, a heat treatment machine (commercially available) as shown in FIG. For example, a stroto machine manufactured by Struto Corporation may be used, and the heating roller may be folded into an accordion type by being pushed into a hot air suction heat treatment machine set to a melting point of the low melting point polymer or higher by a driving roller, and then heated. .

In the sheet material for absorbent articles thus obtained, the weight per unit area is 12 to 70 g / m ² in order to further improve the shielding property against dirt and the adsorptivity of solid matter and dissolved matter contained in the body fluid. The thickness is preferably in the range of 1 to 9 mm, and the density is preferably in the range of 0.005 to 0.01 g / cm ³ .
The sheet material for absorbent articles may be added with known functional processing such as normal dyeing processing, hydrophilic processing, water repellent processing, flameproof processing, flame retardant processing, and negative ion generation processing.

  Since the sheet material for absorbent articles of the present invention contains polyester fibers having fine pores on the fiber surface, light is irregularly reflected by the effect of such fine pores, and thus has excellent shielding properties against dirt. At the same time, solids and dissolved substances contained in the body fluid are adsorbed with good performance into the fine pores. Furthermore, the excellent usability is not impaired.

  Next, the absorbent article of the present invention is an absorbent article using the above sheet material. The absorbent article includes the sheet material and an absorbent body made of a granular or fibrous form (for example, Beloasis (registered trademark) manufactured by Teijin Fibers Limited) or a gel-like water-absorbing polymer. At that time, the sheet material is preferably used as a skin side and / or an outside air side skin material, but may be included in the absorbent article as an intermediate layer. The absorbent article may include other sheet materials and accessories.

  Since the absorbent article of the present invention contains the sheet material, it has excellent shielding properties against dirt. At the same time, solids and dissolved substances contained in the body fluid are adsorbed with good performance into the fine pores. Furthermore, the excellent usability is not impaired.

  The absorbent article of the present invention is particularly preferably used as an absorbent article for absorbing bodily fluids such as blood and urine, such as paper diapers and sanitary napkins. For example, a desiccant or a hygroscopic material for absorbing humidity Furthermore, you may use for other uses, such as a wall material.

  Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.

(1) Alkali weight loss rate Mass was measured before and after the alkali weight loss treatment, and they were designated as A1 and A2, respectively. And the alkali weight loss rate was computed with the following formula.
Alkali weight loss rate (%) = (A1-A2) / A1 × 100
A1: Mass before alkali weight loss treatment A2: Mass after alkali weight loss treatment

(2) Thickness, basis weight, density Measured according to JIS K6400.

(3) Concealment The L value was measured using a Machbeth Color-Eye 3100 (manufactured) with a light source D65 and a 10-degree field of view. And concealment property was computed with the following formula. If the concealing property is 3500 or more, it is regarded as acceptable.
Concealment property = (L1-LR) / density [g / cm ³ ]
L1: L value of sheet material when red reference cloth (L value is 34) is placed on the back LR: L value 34 of red reference cloth

(4) Adsorption First, as a simulated liquid of menstrual blood and urine, a solution in which 4.5 g of sodium chloride and 6 ml of a commercially available ink “Stamp Ink No. 2 Red” Lion Office (made) are added to 500 L of pure water. Prepared. Moreover, the top sheet of a commercially available diaper “Relief Urine Removal Pad Safe Absorption” (trade name, manufactured by Kao Corporation) was carefully peeled and cut into a length of 150 mm × width of 150 mm was used as a test absorbent.
Subsequently, in order to evaluate the adsorptivity of the solid substance and dissolved substance contained in a body fluid, the following test was implemented according to procedures 1-4 using the said pseudo | simulation liquid.
1. A test absorber was laid under the sheet material, and an injection cylinder having a diameter of 30 mm was set on the sheet material.
2. 10 ml of the test solution was injected from the injection tube.
3. The sheet material was dried.
4). The surface of the sheet material and the cross section were photographed by XMA, and the adsorption state of the dissolved material on the fiber surface was determined by the qualitative analysis and surface analysis results of chloride ions (cl). And from the image of the surface analysis, it was evaluated in three stages: adsorption was confirmed (3rd grade), adsorption was slightly confirmed (2nd grade), and adsorption was hardly confirmed (1st grade).

(5) Feeling of use A sheet material was attached to the test absorber, and a wearing test was performed. The grade was evaluated in three levels: excellent (Class 3), normal (Class 2), and inferior in use (Class 1). .

(6) Melting point Using a differential thermal analyzer 990 model manufactured by Du Pont, measured at a temperature rise of 20 ° C./min, and found a melting peak. When the melting temperature was not clearly observed, the melting point was defined as the temperature at which the polymer softened and started to flow (softening point) using a micro melting point measuring device (manufactured by Yanagimoto Seisakusho). In addition, the average value was calculated | required by n number 5.

(7) Number of crimps and crimp rate
It was measured by the method described in JIS L 1015. In addition, the average value was calculated | required by n number 5.

(8) Width and length of micropores The fiber surface was photographed with an electron microscope, and the width and length of the micropores were measured with an n number of 10.

[Production Example 1]
An acid component in which terephthalic acid and isophthalic acid are mixed at 80/20 (mol%) and butylene glycol are polymerized, and 38 wt% of the resulting polybutylene terephthalate is further added to 62 wt% of polytetramethylene glycol (molecular weight 2000). A heat-reaction was performed to obtain a block copolymerized polyether polyester elastomer (thermoplastic elastomer). The melting point of this thermoplastic elastomer was 155 ° C. This thermoplastic elastomer is spun into a sheath (sheath), polyethylene terephthalate (melting point 256 ° C.) is spun into the core (core) so that the weight ratio of the sheath / core is 50/50, and an eccentric sheath-core type composite fiber is obtained. It was. The obtained composite fiber was stretched 2.0 times, dried at 80 ° C. to develop crimps, then applied with an oil agent and cut into 51 mm to obtain heat-adhesive short fibers. In the heat-bondable short fibers, the single yarn fineness was 6.6 dtex, the number of crimps was 13 / 2.54 cm, and the crimp rate was 30%.

[Production Example 2]
According to Example 1 of JP-B-61-31231, in the polymerization reaction step of polyethylene terephthalate, 1.3 mol% of sodium 3-carbomethoxybenzenesulfonate-5-carboxylate (sodium After forming a polyester (chip) having an intrinsic viscosity of 0.60 and a softening point of 258 ° C., the polyester is spun and stretched by a conventional method, and then an oil agent is applied and cut to a fiber length of 38 mm. Furthermore, polyester crimped short fibers having a triangular hollow cross-sectional shape were obtained by further applying mechanical crimping.
Next, the polyester crimped short fiber (polyester fiber) in which fine pores are formed on the fiber surface by treating the polyester crimped short fiber with an aqueous caustic soda solution having an alkali concentration of 1% at a boiling temperature for 120 minutes to reduce the weight by 26%. Obtained. In the polyester crimped short fiber, the width of the fine pores was distributed in the range of 0.01 to 2 μm, and the length was distributed in the range of 0.3 to 12 μm. Moreover, the fine hole was connected to the hollow part. Moreover, the single yarn fineness was 1.5 dtex, the fiber length was 38 mm, the number of crimps was 9 / 2.54 cm, and the crimp rate was 34%.

[Production Example 3]
In Production Example 2, the procedure was the same as Production Example 2 except that the cross-sectional shape of the single fiber was changed to a round solid and the weight loss rate was changed to 24%. In the obtained polyester crimped short fiber, the width of the fine pores was distributed in the range of 0.01 to 2 μm, and the length was distributed in the range of 0.3 to 12 mm. Moreover, the single yarn fineness was 1.5 dtex, the fiber length was 38 mm, the number of crimps was 9 / 2.54 cm, and the crimp rate was 34%.

[Example 1]
Using the heat-adhesive composite short fiber 30% by weight obtained in Production Example 1 and the polyester crimped short fiber 70% by weight obtained in Production Example 2, the card is defibrated into a web, followed by dry heat treatment. (160 ° C.) to obtain a fiber structure (nonwoven fabric) having a basis weight of 13 g / m ² .
In the fiber structure, a fixing point that is heat-sealed in a state where the heat-adhesive composite short fibers intersect with each other and a fixing point that is heat-bonded in a state where the heat-adhesive composite short fibers and the polyester crimped short fibers intersect. And were scattered.
The fiber structure had a sufficiently high concealing property of 4200, was excellent in concealing property, and was confirmed to have a function of adsorbing in the fine pores of solid matter and dissolved matter in the body fluid (third grade). Moreover, when the sheet material was attached to the test absorber and a wearing test was performed, it was excellent in feeling of use (grade 3). The evaluation results are shown in Table 1.

[Example 2]
In Example 1, it carried out similarly to Example 1 except changing the fabric weight of a fiber structure (nonwoven fabric) into 51 g / m < ² >.
In the obtained fiber structure, the concealability was sufficiently high as 5800, the concealability was excellent, and the function of adsorbing in the fine pores of solid matter and dissolved matter in the body fluid was confirmed (Class 3). Moreover, when the sheet material was attached to the test absorber and a wearing test was performed, it was excellent in feeling of use (grade 3). The evaluation results are shown in Table 1.

[Example 3]
Using the heat-adhesive composite short fiber 30% by weight obtained in Production Example 1 and the polyester crimped short fiber 70% by weight obtained in Production Example 3, the card is defibrated into a web, followed by dry heat treatment. Thus, a fiber structure (nonwoven fabric) having a basis weight of 31 g / m ² was obtained.
In the obtained fiber structure, the concealing property was sufficiently high as 4500, excellent in concealing property, and the adsorption function in the fine pores of the solid matter and the dissolved matter in the body fluid was confirmed (third grade). Moreover, when the sheet material was attached to the test absorber and a wearing test was performed, it was excellent in feeling of use (grade 3). The evaluation results are shown in Table 1.

[Example 4]
Using 50% by weight of the heat-adhesive composite short fiber obtained in Production Example 1 and 50% by weight of the polyester crimped short fiber obtained in Production Example 3, the card is defibrated into a web, followed by dry heat treatment. Thus, a fiber structure (nonwoven fabric) having a basis weight of 29 g / m ² was obtained.
In the obtained fiber structure, the concealing property was sufficiently high as 3900, excellent in concealing property, and the function of adsorbing in the fine pores of solid matter and dissolved matter in body fluid was confirmed (Class 3). Moreover, when the sheet material was attached to the test absorber and a wearing test was performed, it was excellent in feeling of use (grade 3). The evaluation results are shown in Table 1.

[Comparative Example 1]
80% by weight of heat-adhesive composite short fiber (single yarn fineness 1.7 dtex, fiber length 44 mm) manufactured by Teijin Fibers Ltd., in which polyethylene terephthalate (melting point 255 ° C.) in the core and polyethylene (melting point 130 ° C.) in the sheath are combined, Using Teijin Fibers Limited polytrimethylene terephthalate short fiber (single yarn fiber 1.1 dtex, fiber length 38 mm) 20% by weight, the card is defibrated into a web and dry heat treated (140 ° C.). Thus, a fiber structure (nonwoven fabric) having a basis weight of 22 g / m ² was obtained.
The non-woven fabric has a low concealment property of 2300 (first grade) and does not include fibers having fine pores on the fiber surface, and therefore, an adsorption function in the fine pores of solid matter and dissolved matter in body fluid was not confirmed. (1st grade). The evaluation results are shown in Table 1.

[Comparative Example 2]
100% by weight of Teijin Fibers Limited heat-adhesive composite short fiber (single yarn fineness 1.7 dtex, fiber length 44 mm) in which polyethylene terephthalate (melting point 255 ° C.) and polyethylene (melting point 130 ° C.) are combined in the core is used. Then, the fiber was defibrated by a card machine to obtain a web, followed by dry heat treatment (140 ° C.) to obtain a fiber structure (nonwoven fabric) having a basis weight of 25 g / m ² .
The non-woven fabric has a low concealment property of 2800 (first grade) and does not contain fibers having fine pores on the fiber surface, and therefore, an adsorption function in the fine pores of solid matter and dissolved matter in body fluid was not confirmed. (1st grade). The evaluation results are shown in Table 1.

[Comparative Example 3]
A card using 100% by weight of a heat-bondable composite short fiber (single yarn fineness 2.2 dtex, fiber length 51 mm) made by Konan High Fiber, which is composed of polypropylene (melting point 160 ° C.) in the core and polyethylene (melting point 136 ° C.) in the sheath. A fiber structure (nonwoven fabric) having a basis weight of 22 g / m ² was obtained by defibrating with a machine to obtain a web and dry heat treatment (140 ° C.).
In the nonwoven fabric, the concealability is as low as 1500 (first grade), and since the fiber surface does not include fibers having micropores, the adsorption function in the micropores of solid matter or dissolved matter in body fluid was not confirmed. (1st grade). The evaluation results are shown in Table 1.

  According to the present invention, it is a sheet material for absorbent articles that is used as a constituent member of an absorbent article, has an excellent shielding property against dirt without impairing an excellent feeling of use, and in body fluids The sheet | seat material for absorbent articles which can adsorb | suck the contained solid substance and melt | dissolution material with sufficient performance, and the absorbent material which uses this sheet | seat material are obtained, The industrial value is very large.

Claims (12)

  An absorbent article sheet material used as a constituent member of an absorbent article, comprising a polyester fiber having fine pores on a fiber surface.   The sheet material for absorbent articles according to claim 1, wherein the fine holes have a fine hole width of 0.001 μm or more. The sheet material for absorbent articles according to claim 1 or 2, wherein the micropores are micropores obtained by removing at least one part of polyester containing a micropore forming agent represented by the following formula. .

(In the formula, M and M ′ are metals, preferably alkaline earth metals, manganese, cobalt, and zinc, and M and M ′ may be the same or different. R is a hydrogen atom or an ester-forming functional group. And n represents 1 or 2.)   The sheet material for absorbent articles according to any one of claims 1 to 3, wherein the polyester fiber is a hollow fiber, and the fine hole communicates with a hollow portion.   Furthermore, the heat-adhesive conjugate fiber by which the polymer which has 40 degreeC or more lower melting | fusing point than the polymer which comprises the said polyester fiber was distribute | arranged on the surface as a heat-fusion component is contained. Absorbent article sheet material.   The sheet material for absorbent articles according to claim 5, wherein a weight ratio of the polyester fiber to the heat-adhesive conjugate fiber is in the range of (the former: the latter) 10:90 to 50:50.   The sheet | seat material for absorbent articles in any one of Claims 1-6 whose sheet material for absorbent articles is a nonwoven fabric. The sheet | seat material for absorbent articles in any one of Claims 1-7 whose fabric weight is in the range of 12-70 g / m < ² >.   The sheet | seat material for absorbent articles in any one of Claims 1-8 whose thickness exists in the range of 1-9 mm. The sheet material for absorbent articles according to any one of claims 1 to 9, wherein the density is in the range of 0.005 to 0.01 g / cm ³ .   An absorptive article containing the sheet material according to any one of claims 1 to 10.   The absorbent article according to claim 11, wherein the absorbent article is for absorbing body fluid.