JP4980685B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article comprising an anti-fogging agent in a portion that comes into contact with the skin of a wearer's wearing portion.

Absorbent articles such as disposable diapers and sanitary napkins are known to cause blurring on the skin of the wearing part due to oxidation and alteration of sebum and amino acids present on the skin surface. It is known to apply an antioxidant such as vitamin E group to the part of the wearing part that comes into contact with the skin (see, for example, Patent Document 1).
JP 2002-172130 A

However, like vitamin E group, antioxidants that prevent oxidation of nearby substances by their own oxidation are oxidized by contact with oxygen in the air by the time the product is used, simply by applying it to the product. As a result, the antioxidant function may not be sufficiently exhibited. In particular, this tendency is remarkable when using an antioxidant having a strong antioxidant power such as the vitamin E group.
Therefore, the main problem of the present invention is to enable long-term maintenance of the antioxidant effect.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
At least a part that comes into contact with the skin of the wearer's wearing part is an absorbent article containing an anti-fogging agent,
The anti-fogging agent is a microcapsule comprising a core containing an antioxidant that prevents oxidation of a proximity substance by its own oxidation, and a shell containing an antioxidant other than the antioxidant contained in the core. And a reducing agent that reduces the oxidized antioxidant ,
Antioxidants contained in the core is vitamin E group, antioxidant contained in the shell Ru vitamin A Gundea,
An absorbent article characterized by the above.

(Function and effect)
In this way, as an anti-fogging agent, not only an antioxidant that prevents oxidation of adjacent substances by its own oxidation, but also a combination of a reducing agent that reduces the oxidation when the antioxidant is oxidized, the oxidation is prevented. The long-term maintenance effect can be maintained.
In addition to using two or more kinds of antioxidants in this way, an antioxidant having a relatively strong antioxidant effect is contained in the core of the microcapsule, and an antioxidant having a relatively weak antioxidant effect is contained in the microcapsule. When contained in the shell, it is preferable because the effect of each component can be exhibited in a desired balance. When such microcapsules are used, such a combination is particularly preferable in order to prevent oxidation due to oxygen in the air and to suppress oxidation / degeneration of sebum and amino acids in multiple stages.

  Vitamin E group has strong antioxidant power and is easily oxidized by contact with air. Therefore, the present invention is suitable when such an antioxidant is used. Moreover, since vitamin E is reduced by vitamin C excreted in urine, application to disposable diapers is preferable.

<Invention of Claim 2 >
The vitamin E group comprises α-type of vitamin E 50% by weight or more, the absorbent article according to claim 1, wherein.

(Function and effect)
The vitamin E group includes α-type, β-type, γ-type, and δ-type. Among them, α-type vitamin E is superior in anti-oxidation effect compared to others, and therefore it is preferable to increase the amount of vitamin E used.

<Invention of Claim 3 >
The absorbent article according to claim 1 or 2 , wherein the reducing agent is a vitamin C group or coenzyme Q10.

(Function and effect)
As the reducing agent, vitamin C group and coenzyme Q10 are particularly preferable in terms of both safety and effect.

<Invention of Claim 4>
The absorptive article according to any one of claims 1 to 3 in which said anti-fogging agent contains an emollient agent.

(Function and effect)
An emollient refers to a lubricity enhancing substance that functions to soften, relieve, supple, coat, smooth, humidify or cleanse the skin. When the emollient dissolves with body temperature and moves to the skin, irritation caused by excrement can be reduced. In addition, the emollient can improve the lubricity at the contact portion between the article and the skin, and can reduce physical irritation.

<Invention of Claim 5>
The anti-fogging agent is included in a liquid-permeable top sheet that covers a portion that comes into contact with the skin of the absorbent article, and the top sheet has a convex roll provided with a plurality of convex portions on the roll surface, and a roll surface. The absorbent article according to any one of claims 1 to 4, wherein the embossed roll is provided with a concave roll provided with a plurality of concave portions into which the convex portions are fitted.

(Function and effect)
When uneven | corrugated embossing is provided to the surface sheet, physical irritation can be reduced by reducing the contact area with the user's skin.

  As described above, according to the present invention, there are advantages such as the long-term maintenance of the antioxidant effect.

Hereinafter, an embodiment of the present invention will be described first about an example of a paper diaper to be applied, and then an anti-fogging agent according to the present invention will be described.
<Example of pants-type paper diapers>
FIG. 1 shows an example of a pants-type disposable diaper. The pants-type disposable diaper 10 includes an exterior sheet 12 on the outer surface (back surface) side and an absorbent main body 20 on the inner surface (front surface) side, and the absorbent main body 20 is fixed to the exterior sheet 12. The absorptive main body 20 is a part that receives excrement such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later) and absorbs and holds the liquid. The exterior sheet 12 is a part for mounting on the wearer.

  The exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which a wearer's leg is put. The absorptive main body 20 can take any shape, but is rectangular in the illustrated form.

  The exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed at a predetermined position as shown in FIG. Joined by heat fusion or the like. Thereby, a pants-type disposable diaper having a structure shown in FIG. 1 and having a waist opening WO and a pair of leg openings LO is obtained.

  An intermediate width in the longitudinal direction of the absorbent main body 20 shown in the drawing (that is, the vertical direction in FIG. 2, which is also the front-rear direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. This width relationship may be reversed or the same width.

  The exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and a form that fits the wearer by the contraction force is desirable. As the elastic elastic member, thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers. In the illustrated embodiment, the rubber threads 12C, 12C,... Are provided continuously in the width direction in the waist region W, provided only on both sides in the lower waist region U, and not provided in the crotch region L. Since the rubber threads 12C, 12C,... Are provided in both the waist region W and the lower waist region U, even if the shrinkage force of the rubber thread 12C itself is weak, the rubber waist 12C hits the wearer in the lower waist region U as a whole. The product fits well to the wearer.

(Absorbent body)
As shown in FIG. 3, the absorbent main body 20 according to the embodiment includes, in order from the use surface side, a top sheet 30 made of, for example, a nonwoven fabric that allows liquid to pass through, an intermediate sheet (second sheet) 40, and an absorbent element 50. It has. Further, a liquid-impermeable sheet (also referred to as a back sheet) 70 is provided on the back side of the absorbent element 50. An exterior sheet 12 is provided on the back side of the liquid-impermeable sheet 70. Further, barrier cuffs 60, 60 are provided on both sides.

(Top sheet)
The top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. Examples include synthetic fibers such as polyethylene and polypropylene such as olefins, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used. can do. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method. For example, the spun lace method is a preferable processing method for obtaining flexibility and drapeability, and the thermal bond method is for obtaining bulkiness and softness.
The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Intermediate sheet)
In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorber, an intermediate sheet 40 that is faster than the top sheet 30 and that is normally called a “second sheet” can be provided. For example, as shown in the drawing, it can be interposed between the top sheet 30 and the covering sheet 58. This intermediate sheet 40 not only quickly transfers the liquid to the absorbent body 56 and enhances the absorption performance by the absorbent body 56, but also prevents the “returning” phenomenon of the absorbed liquid from the absorbent body, It can always be in a dry state. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, pulp nonwoven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid. A typical material of the intermediate sheet 40 is a nonwoven fabric having excellent liquid permeability.

(Embossing)
In order to reduce the contact area with the user's skin and reduce physical irritation, uneven embossing can be imparted to the top sheet 30 or both the top sheet 30 and the intermediate sheet 40.

  The embossing in this embodiment is a top sheet 30 or a top by an embossing roll comprising a convex roll provided with a plurality of convex portions on the roll surface and a concave roll provided with a plurality of concave portions where the convex portions are fitted on the roll surface. It is applied to the sheet 30 and the intermediate sheet 40. As the embossing roll, it is preferable to use an irregular type of convex roll and concave roll. Thereby, since the area of the site | part in which the top sheet 30 contacts a user's skin becomes narrow, absorbent articles, such as a disposable paper diaper obtained, will become difficult to produce rough skin, such as a rash. Here, that the convex roll and the concave roll are atypical means that the pattern shape of the convex roll and the pattern shape of the concave roll are different (one roll may be a plane).

  In this embodiment, the shape and shape of the convex roll and the concave roll are not particularly limited. However, as shown in FIGS. 6 and 7, the convex portion 103 has, for example, a reverse mortar shape that is a rhombus in the illustrated example such as a circle, an ellipse, a square, a rectangle, a rhombus, etc. As shown in FIG. 8 and FIG. 9, it is preferable that the boundary between the concave portions 104 adjacent to each other has a lattice shape (lattice portion 6). According to this embodiment, since the nip state of the convex roll and the concave roll is as shown in FIGS. 10 and 11 (in FIG. 11, the convex roll 101 is indicated by a dotted line, this is the convex roll 101. And the concave roll 102, and not the purpose of making it a hidden line.), The cup portion formed by the convex portion 103 and the concave portion 104 corresponding to the convex portion 103 on the top sheet 30 and the intermediate sheet 40; Embossing having an inter-convex portion 105 and a skin contact portion formed by a lattice-like portion 106 fitted between the convex portions 105 is provided. Therefore, in the absorbent article obtained, the urine and soft stool are held by the cup part, the diffusion of urine and soft stool is prevented by the skin contact part, and the part that comes into contact with the user's skin is only the skin contact part. Since the contact area is narrowed, rough skin is less likely to occur, and the cup portion and the skin contact portion are waffled to give a soft feeling.

  Moreover, as a form with which the convex roll 101 and the concave roll 102 are atypical, as shown in FIG.12 and FIG.13, as for the convex part 103, for example, a front end surface is circular, an ellipse, a square, a rectangle, As shown in FIGS. 14 to 16, the boundary between the concave portions 104 adjacent to each other is a lattice shape (lattice-like portion 6) such as a rhombus, which is a circular mortar shape that is circular in the illustrated example. A configuration in which the narrow protrusions 107 are provided on the front end surface of the lattice-like portion 106 can also be exemplified as a preferable example. According to this embodiment, the nip state between the convex roll 101 and the concave roll 102 is as shown in FIGS. 17 to 19 (in FIG. 18 and FIG. 19, the convex roll 101 is indicated by a dotted line. Is for clearly distinguishing the convex roll 101 and the concave roll 102, and is not intended to be a hidden line.) Therefore, the emboss formed on the top sheet 30 and the intermediate sheet 40 is similar to the previous embodiment, and the cup portion formed by the convex portion 103 and the concave portion 104 corresponding thereto, and the interval between the convex portions 105 adjacent to each other. And a skin contact portion formed by the lattice-like portion 106 fitted between the convex portions 105, and has the same effect as the previous embodiment. In addition, in this embodiment, since the narrow protrusions 7 are provided on the front end surface of the lattice-like portion 106, the skin contact portion becomes narrower, and the resulting absorbent article has a contact area with the skin. Narrower and more difficult to cause rough skin. Similarly, in the present embodiment, since the narrow protrusions 107 are provided on the front end surface of the lattice-like portion 106, the skin contact portion is given more clearly, and the resulting absorbent article is , Will give a waffle-like soft feeling. Furthermore, if the concave and convex portions are reversed, only the convex portion 103 comes into contact with the skin, so that the contact area with the skin is reduced and a fluffy quilted pattern can be obtained.

  As long as the embossing of this form satisfies the above requirements, the shape, depth, pitch, and the like can be appropriately changed in design. However, the depth L of the emboss is the thickness gauge of the top sheet 30 and the intermediate sheet 40 (the thickness obtained by adding the thickness of the top sheet 30 and the thickness of the intermediate sheet 40. Note that the emboss 106 is applied only to the top sheet 30. Is the thickness of the top sheet 30, and when the emboss 106 is applied to the top sheet 30, the intermediate sheet 40, and the absorber 56, the thickness of the top sheet 30, the thickness of the intermediate sheet 40, and the thickness of the absorber 56 are added. It is preferable that the thickness be greater than or equal to the thickness. This is because the embossed shape is clearly inserted and the shape is maintained. For example, when the thickness of the top sheet 30 is 0.1 to 0.7 mm and the thickness of the intermediate sheet 40 is 0.1 to 1.0 mm, the depth L of the emboss 106 is 0.2 to 1.7 mm, preferably It can be set to 0.25 to 4.0 mm.

  Further, the area of the emboss 106 is preferably 5 to 100% of the lamination area of the top sheet 30 and the intermediate sheet 40 (the area of the portion having a lamination relationship), and is preferably 25 to 80%. More preferred. When the area of the emboss 106 is 5% or more of the lamination area of the top sheet 30 and the intermediate sheet 40, diffusion of urine and loose stool on the top sheet 30 is reduced.

  In this embodiment, when embossing is applied, it is preferable to satisfy the relationship of 30 mm ≦ width of embossing ≦ width of intermediate sheet ≦ 120 mm ≦ width of top sheet ≦ 250 mm, and 70 mm ≦ width of embossing It is more preferable to satisfy the relationship of ≦ intermediate sheet width ≦ 90 mm ≦ top sheet width ≦ 180 mm. If the width for embossing is less than 30 mm, the embossing effect (stool absorption / skin area) is difficult to obtain, and the adhesive strength between the top sheet 30 and the intermediate sheet 40 cannot withstand actual use (peel). When the width of the intermediate sheet 40 exceeds 120 mm, the strength of the adhesion part of the other sheet is lowered, which is not preferable. If the width of the top sheet 30 is less than 120 mm, other sheets (such as gather sheets) cannot be bonded to the top sheet 30 and the adhesiveness is weak, which is not preferable. When the width of the top sheet 30 exceeds 250 mm, the top sheet 30 has only to be wound around the absorber 56 or to be cut, which is a wasteful material.

In this embodiment, the relationship of 0.10 mm ≦ top sheet thickness ≦ intermediate sheet thickness ≦ 2.50 mm and 15 g / m ³ ≦ top sheet basis weight ≦ intermediate sheet basis weight ≦ 50 g / m ³ is satisfied. Preferably, 0.15 mm ≦ top sheet thickness ≦ intermediate sheet thickness ≦ 2.85 mm and 20 g / m ³ ≦ top sheet basis weight ≦ intermediate sheet basis weight ≦ 35 g / m ³ It is more preferable to satisfy the above condition. If the thickness of the top sheet 30 is less than 0.15 mm, it is difficult to produce the nonwoven fabric itself, and the appearance of the embossing is adversely affected by density and uneven density. If the thickness of the top sheet 30 exceeds the thickness of the intermediate sheet 40, urine and feces may be retained in the top sheet 30, and there is a possibility that the absorption into the absorbent body 56 may be deteriorated. If the thickness of the intermediate sheet 40 exceeds 2.35 mm, the weight increases and the cost increases. In addition, when the basis weight of the top sheet 30 is less than 15 g / m ^3, it is difficult to produce the nonwoven fabric itself, and the appearance of the embossing is adversely affected by density and uneven density. If the basis weight of the top sheet 30 exceeds the basis weight of the intermediate sheet 40, urine and feces may be retained on the top sheet 30 and the absorption into the absorbent body may be deteriorated. If the basis weight of the intermediate sheet 40 exceeds 50 g / m ³ , the basis weight increases and the cost increases. Furthermore, the reason why the thickness and the basis weight of the top sheet 30 and the intermediate sheet 40 are simultaneously limited is to balance the appearance of the emboss and the absorbability.

  In this embodiment, when embossing is applied, when heat is applied to the convex roll 101 and the concave roll 102, 0.05 mm ≦ clearance between the convex roll and the concave roll ≦ top sheet and intermediate sheet thickness gauge (of the top sheet) (Thickness obtained by adding the thickness and the thickness of the intermediate sheet.) It is preferable to satisfy the relationship of ≦ 3.0 mm, 0.05 mm ≦ clearance between convex roll and concave roll ≦ thickness gauge of top sheet and intermediate sheet ≦ It is more preferable to satisfy the relationship of 2.50 mm. If the clearance is less than 0.05 mm, heat is applied to the entire top sheet 30 and intermediate sheet 40, so that both sheets may melt and become hard. When the clearance exceeds the thickness gauge of the top sheet 30 and the intermediate sheet 40, the emboss pattern is not required. If the clearance exceeds 3.0 mm, embossing is not clearly applied, and the top sheet 30 and the intermediate sheet 40 may not be heat sealed.

  As described above, when heat is applied to the convex roll 101 and the concave roll 102, it is preferable that 40 ° C. <roll surface temperature of the convex roll <roll surface temperature of the concave roll <180 ° C., and 80 ° C. <convex. More preferably, the roll surface temperature of the roll <the roll surface temperature of the concave roll <120 ° C. When the roll surface temperature of the convex roll 101 is less than 40 ° C., a sufficient emboss pattern does not enter. Further, if the roll surface temperature of the convex roll 101 is equal to or higher than the roll surface temperature of the concave roll 102, the convex pattern becomes too clear and hard before the lattice pattern enters. Furthermore, when the roll surface temperature of the concave roll 102 is 180 ° C. or higher, the lines of the lattice are excessively patterned, and the surface becomes hard.

  Moreover, it is preferable that the constituent material of the top sheet 30 and the constituent material of the intermediate sheet 40 are the same regardless of the temperature of the roll surface temperature of the convex roll 101 and the concave roll 102. This is because the heat sealing force is increased. Here, the identity of the constituent material includes the raw material (for example, made of polyester, polyethylene, etc.), the thickness (denier) / fiber length of the constituent fiber, the production method (for example, spunbond, meltblown, etc.). , Means broadly the same or not.

  When embossing is applied as described above, the top sheet 30 and the intermediate sheet 40 need not be bonded together with an adhesive such as hot melt. The top sheet 30 and the intermediate sheet 40 are bonded together by applying an emboss 106 such as heat embossing or ultrasonic embossing in a laminated state by the method described above. Therefore, the problem that the top sheet 30 is stiff due to the adhesive and rough skin is likely to occur does not occur. Further, the embossing prevents the top sheet 30 and the intermediate sheet 40 from coming into close contact with each other, and a gap is not formed between the sheets 30 and 40. Therefore, the bodily fluid is immediately absorbed by the absorber 53, and the bodily fluid stays in the gap, and there is no possibility that the bodily fluid stays back through the top sheet 30. The top sheet 30 and the intermediate sheet 40 can be bonded with an adhesive such as hot melt. In that case, the adhesive does not ooze out from the top sheet 30 even if embossing is applied. Ingredient: Styrene-butadiene-styrene block copolymer, added: UV absorber added, no rosin added (causes odor), volatile: 2.0% or less, ash: 0.5% or less, 150 ° C. A hot melt adhesive having a melt viscosity of 5000 ± 1500 mPa · s (conforming to JIS K-6862-1984) and a softening degree of 84.0 ± 7.0 ° C. (conforming to JIS K-6863-1994) is used. preferable.

(Liquid impervious sheet)
The liquid-impermeable sheet 70 is a sheet disposed on the back side of the absorber 56, and the material thereof is not particularly limited. For example, the liquid-impermeable sheet 70 may be an olefin resin such as polyethylene or polypropylene, a polyethylene sheet, or the like. A laminated non-woven fabric obtained by laminating non-woven fabrics, a non-woven fabric that is substantially impervious to liquids through a waterproof film (in this case, a liquid-impervious sheet is composed of the waterproof film and the non-woven fabric), and the like. Can do. Of course, in addition to this, materials having liquid impermeability and moisture permeability, which have been used and used in recent years from the viewpoint of preventing stuffiness, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained in this way can be given.
By causing the liquid-impermeable sheet 70 to wrap around from the both sides of the absorbent body to the upper surface side (not shown), it is possible to prevent the liquid from leaking sideways. However, in the illustrated embodiment, a barrier cuff 60 is formed for the side leakage. This is prevented by interposing the second liquid-impermeable sheet 72 between the double barrier sheets 64. According to this embodiment, since the second liquid-impermeable sheet 72 extends until the barrier cuff 60 stands up, the liquid diffused laterally along the top sheet 30 and the side of the soft stool between the barrier cuffs 60, 60 are arranged. There is also an advantage that leakage can be prevented.

(Barrier cuffs)
Barrier cuffs 60, 60 provided on both sides of the product are provided to prevent side leakage of urine and soft stool that move in the lateral direction along the top sheet 30. The illustrated barrier cuff 60 is formed by double-layering a water-repellent nonwoven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30 so as to protrude to the front surface side. Is formed. In particular, in the illustrated embodiment, a liquid-impermeable sheet 72 is inserted between the double nonwoven fabric sheets to prevent urine permeation, and extends to the middle of the barrier cuff 60 projecting to the surface side.
The shape of the barrier cuff 60 itself can be designed as appropriate, but in the illustrated example, the front and rear ends of the barrier cuffs 60 and 60 are fixed in a folded state, and the intermediate portion in the front and rear direction is not fixed. In addition, an elastic elastic member, for example, a rubber thread 62, is fixed under stretch along the front-rear direction and the intermediate portion in the protruding direction of the barrier cuff 60, and the barrier cuff 60 stands up by the contraction force in use. It is supposed to be. The barrier cuff 60 can have a laminated structure of a plurality of sheets. In such a case, the physical crushing can be achieved by reducing the contact area with the user's skin in the same manner as the top sheet 30. Uneven embossing can be applied to reduce the thickness.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The covering sheet 58 can be omitted. The absorbent element 50 can be adhered to the inner surface of the exterior sheet 12 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
As the absorbent body 56, in addition to the fiber piled with short fibers such as cotton-like pulp, those made of aggregates of filaments 52, 52.
The aggregate of filaments 52, 52... Can be obtained by opening a tow (fiber bundle). Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polyvinyl acetate, etc.). In particular, cellulose esters and cellulose are preferable.

  As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, bacterial cellulose, and the like can be used. Regenerated cellulose such as rayon may be used, and the regenerated cellulose may be a spun fiber.

  Examples of cellulose esters that can be suitably used include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; mixed acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose nitrate acetate. And cellulose ester derivatives such as polycaprolactone-grafted cellulose ester can be used. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

  The average degree of polymerization of the cellulose ester can be, for example, 10 to 1000, preferably 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3, preferably 1 to 1. 2.15, more preferably about 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

  As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The degree of acetylation of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

  The tow constituent fiber may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.

  The fineness of the tow constituting fiber is, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably 1 to 6 denier. The tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. The cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good. The tow constituting fibers are used in the form of tows (fiber bundles) formed by bundling, for example, about 1,000 to 1,000,000, preferably about 2,000 to 1,000,000 single fibers. can do. The fiber bundle is preferably formed by bundling about 1,000 to 1,000,000 continuous fibers.

Cellulose diacetate tow bales that can be suitably used in the present invention are commercially available from Celanese and Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 g / cm ³ and a total weight of 400-600 kg. From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk. The opening width of the tow is arbitrary, and can be, for example, a width of 50 to 2000 mm, preferably about 50 to 300 mm, which is the width of the product absorber. Moreover, the density of an absorber can be adjusted by adjusting the degree of tow opening.

(Superabsorbent polymer particles)
Preferably, as shown in FIG. 3, superabsorbent polymer particles 54, 54. It is desirable that at least in the liquid receiving region, the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 52, 52. The state of being substantially dispersed throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.

  If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the aggregate of filaments, in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some SAP particles do not penetrate into the aggregate of the filaments 52, 52... Remain on the surface, and some SAP particles pass through the aggregate of the filaments 52, 52. The form on the sheet 58 and the form on the holding sheet 80 are not excluded.

  The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles 54 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.

  As the superabsorbent polymer particles 54, those having a water absorption speed of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

  Moreover, as the superabsorbent polymer particles 54, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . By setting the basis weight of the polymer to 50 g / m ² or less, it is possible to prevent the lightening effect from being hardly exhibited by adopting the synthetic continuous fiber due to the weight of the polymer. If it exceeds 350 g / m ² , not only will the effect be saturated, but an excessively high superabsorbent polymer particle 54 will give a sense of incongruity.

  If necessary, the superabsorbent polymer particles 54 can adjust the spray density or spray amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spraying density (amount) and women can increase the center spraying density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

  If necessary, as the superabsorbent polymer particles 54, a plurality of particles having different particle size distributions are prepared, sequentially supplied in the thickness direction, those having a small particle size distribution on the lower side in the absorber 56, and particles having a large particle size distribution on the upper side. Things can be distributed.

  The ratio between the superabsorbent polymer particles 54 and the continuous fibers determines the absorption characteristics. As a weight ratio in a planar area of 5 cm × 5 cm in a region directly receiving the liquid in the absorbent body 56, it is desirable that the superabsorbent polymer particle / continuous fiber weight is 1 to 14, particularly 2 to 9.

(Enveloping sheet)
When the covering sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, etc. can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
As shown in FIG. 3, the covering sheet 58 may cover not only the entire layer of the absorber 56 but also the back and side surfaces of the layer. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials becomes a component of the covering sheet). If necessary, the absorbent body 56 may be sandwiched between two upper and lower sheets or disposed only on the lower surface, but this is not desirable because it is difficult to prevent movement of the superabsorbent polymer particles 54.

(Holding sheet)
Furthermore, as shown in FIG. 3, it is also a preferable embodiment to provide a holding sheet 80 between the back surface side of the absorbent body 56, particularly between the absorbent body 56 and the back surface side portion (lower portion) of the covering sheet 58. . The holding sheet 80 can be omitted.
The superabsorbent polymer particles 54 may fall out of the fiber assembly in the process until use by the consumer, and the irregularities of the fallen particles are crisp when touched by the hand when used by the consumer. Give a sense of incongruity. The holding sheet 80 reduces this feeling of strangeness, and reinforces the stiffness that is not sufficient only by the covering sheet 58.
The material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the superabsorbent polymer particles 54. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
If the holding sheet 80 and the nonwoven fabric, its holding sheet 80, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably, at 0.01~1.00gfcm / cm ^2, and compressed It is preferable that the nonwoven fabric has a resilience of 10 to 100%, preferably 70 to 100%.

(Other)
In addition, although not shown in figure, each structural member of the absorptive main body 20 is mutually fixed by solid, beads, spiral application | coating, etc., such as a hot-melt-adhesive agent.

<Example of tape-fastened disposable diapers>
On the other hand, FIG.4 and FIG.5 has shown the example of the tape fixed type disposable diaper. FIG. 5 is a view taken along line 4-4 in FIG. 4, but the absorptive main body 20 is slightly exaggerated.

  This diaper 10A has fastening pieces attached to both ends of the back side of the diaper, has a hook element on the fastening surface of the fastening piece, and a back sheet constituting the back of the diaper is a nonwoven fabric laminate. When the diaper is mounted, the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the back sheet.

  The absorbent main body 20 has an absorbent body 56 according to the present invention interposed between the top sheet 30 and the liquid impervious sheet 70 as described in the above-described pants-type disposable diaper. It has become. The absorbent body 56 is entirely wrapped by a covering sheet 58 made of tissue paper, and has a rectangular shape in plan view. A holding sheet 80 is provided between the absorber 56 and the covering sheet 58.

  Further, an intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56. The liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outside thereof.

  The top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 by a hot melt adhesive or the like.

  Barrier cuffs 60A projecting to the use surface side are formed on both sides of the diaper. The barrier cuffs 60A are formed of a barrier sheet 64 made of a nonwoven fabric substantially continuous in the width direction, and an elastic elastic member such as a thread rubber. And one or a plurality of leg rubber elastic members 62 as elastic elastic members for the leg periphery. 90 is a fastening piece by a hook-and-loop fastener.

  The inner surface of the barrier sheet 64 has a fixing start end at a position separated from the side edge of the top sheet 30, and the outer portion in the width direction extends from the fixing start end to the extending edge of the liquid-impermeable sheet 70. It is fixed by. The outer surface of the barrier sheet 64 is fixed to the back sheet 12A with a hot melt adhesive or the like on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, thread rubber 66 is provided.

  The beginning of fixing of the inner surface of the barrier sheet 64 to the liquid-impermeable sheet 70 forms an upstanding end of the barrier cuff 60A. Around the leg, the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.

  In this example, by using a hook-and-loop fastener as the fastening piece 90, it can be mechanically fastened to the backsheet 12A. Therefore, a so-called target tape can be omitted, and the fastening position by the fastening piece 90 can be freely selected.

  The fastening piece 90 has a base portion of a fastening base material made of plastic, polylaminated nonwoven fabric, paper, or the like joined to the back sheet 12A, for example, with an adhesive, and has a hook element 90A on the tip side. The hook element 90A is bonded to the fastening substrate with an adhesive. The hook element 90A has a large number of engaging pieces on the outer surface side thereof. A temporary fixing adhesive portion 90B is provided on the tip side from the hook element 90A. At the end of the assembly of the product, the temporary fixing adhesive portion 90B is bonded to the barrier sheet 64 to prevent the fastening piece 90 from peeling off at the front end side. At the time of use, it peels off against the adhesive force and brings the front end side of the fastening piece 90 to the front body. The fastening base material is exposed at the tip side of the temporary fixing adhesive portion 90B, and is a tab portion.

  On the opening side of the front body, a fastening position display sheet 74 is provided on the inner surface side of the back sheet 12A. The fastening position display sheet 74 is printed with a design serving as a guide for fastening the hook element 90A of the fastening piece 90. Is made visible through the back sheet 12A from the outside.

  When the diaper is mounted, the diaper is mounted on the body in the shape of a boat, and the contraction force of the rubber thread 62 acts. Therefore, the barrier cuff 60A stands up around the leg by the contraction force of the rubber thread 62.

  The space surrounded by the standing part forms a confined space for urine or soft stool. When urinating into this space, the urine is absorbed into the absorbent body 56 through the top sheet 30, and the rising part of the barrier cuff 60A becomes a barrier for the solid matter of soft stool, and the overpass is prevented. The In the unlikely event that urine leaks laterally over the standing distal side edge of the standing part, side leakage is prevented by the stop function by the flat contact part.

In this embodiment, it is desirable that the barrier sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-impervious (may be semi-liquid-permeable). Further, the surface sheet (nonwoven fabric laminate) of the present invention may have a property of repelling liquid by silicon treatment or the like. In any case, it is preferable that the barrier sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A are sheets having a water pressure resistance of 100 mmH ₂ O or more. Thereby, it becomes air permeable in the width direction side part of a product, and a wearer's stuffiness can be prevented.

  The other points, for example, the material used for each part, etc. are the same as in the case of the above-described pants-type paper diaper, and therefore the description is omitted.

<About anti-fogging agent>
Now, in the present invention, in the absorbent article such as the paper diaper described above, an anti-fogging agent is contained in at least a part or all of the portion of the wearer that comes into contact with the skin. Specifically, examples of the member containing the anti-fogging agent include the top sheet 30, the barrier cuff 60, the exterior sheet 12, and the like. In these members, at least part or all of the surface exposed to the skin side. Contains an anti-fogging agent.

The method for adding the anti-fogging agent to the product is not particularly limited. For example, the following method can be employed.
(A) When manufacturing the material of the member, an anti-fogging agent is added and mixed in a drug that is contacted with or mixed with the material (for example, an oil used when manufacturing the raw nonwoven fabric).
(B) When manufacturing the material of the member, an anti-fogging agent is applied to the manufactured material.
(C) When manufacturing the absorbent article, that is, before assembling the member, during the assembling process or after assembling, an anti-fogging agent is applied to a predetermined member. In this case, not only continuous application to the entire surface, but also intermittently in the length direction and / or the width direction, a desired part, for example, a crotch part where it is easily fogged, particularly a part around the genital contact part or anal contact part. It is also possible to apply it.

  The anti-fogging agent of the present invention contains an antioxidant that prevents oxidation of a proximity substance by its own oxidation, and a reducing agent that reduces the oxidized antioxidant. Antioxidants and reducing agents are preferably oil-soluble in terms of compatibility with sebum, and specific examples include vitamin E group (including vitamin E, isomers and derivatives thereof, and natural and synthetic types). Vitamin A group (including vitamin A, isomers and derivatives thereof), vitamin C group (including vitamin C, isomers and derivatives thereof), coenzyme Q10, polyphenol, selenium, lycopene, etc. Can be mentioned. From these, one or more appropriate substances can be selected and used as the antioxidant and the reducing agent, respectively.

  Particularly preferred antioxidants are the vitamin E group, and among them, it is preferable to contain 50% by weight or more of α-type vitamin E. As an example, a vitamin E group having an isomer weight ratio α: β: γ: δ of 55: 3: 40: 3 can be mentioned.

  On the other hand, particularly preferred reducing agents are vitamin C group (including vitamin C, isomers and derivatives thereof), and coenzyme Q10.

  When applying an anti-fogging agent or the like, an antioxidant and a reducing agent can be dissolved in an appropriate solvent as necessary, and this solution can be used for application or the like. When using an oil-soluble substance for the antioxidant and the reducing agent, animal and vegetable oils, petroleum hydrocarbons, fatty acid ester compounds and the like can be used as the solvent, but it is preferable to use vegetable oils and fats.

  When vitamin E is used as an antioxidant and vitamin C is used as a reducing agent, vitamin E is generally oil-soluble and vitamin C is water-soluble. For example, the above problem can be solved by microencapsulating one or both of vitamin E and vitamin C in a single anti-fogging agent. In this case, one of vitamin E and vitamin C may be contained in the shell of the microcapsule, and the other may be contained in the core. The above problem can also be solved by using water-soluble vitamin E. In this case, in the process of obtaining water-soluble vitamin E, functional hydrophilic elements such as vitamin C and amino acids may be added to vitamin E.

When using an incompatible antioxidant and reducing agent, it is not always necessary to include each component in the member in the same step. In such a case, for example, the following method can be employed.
(A) When manufacturing the material of the member, the oil-soluble component of the anti-fogging agent is added and mixed in a drug that is contacted with or mixed with the material (for example, an oil used when manufacturing the nonwoven raw cotton). Thereafter, the water-soluble component of the anti-fogging agent is applied to the manufactured material.
(B) When manufacturing an absorbent article, that is, before assembling the member, in the assembly process or after assembling, a material obtained by adding an oil-soluble component of the anti-fogging agent to a predetermined member is used, and the anti-fogging agent is soluble in water. Apply ingredients. In this case, not only continuous application to the entire surface, but also intermittently in the length direction and / or the width direction, a desired part, for example, a crotch part where it is easily fogged, particularly a part around the genital contact part or anal contact part. It is also possible to apply it. In addition, when the water-soluble component is a component that is expected to have an effect due to the component contained in urine such as vitamin C, it can be configured not to be applied around the genital contact portion in order to reduce the amount of application. . Moreover, the raw material to which the water-soluble component of the anti-fogging agent is added can be used for a plurality of members of the product, but it is not necessary to apply the water-soluble component of the anti-fogging agent to all of the members. For example, a material containing an oil-soluble component of an anti-fogging agent may be used for both the top sheet 30 and the barrier cuff 60, and the water-soluble component may be applied only to the top sheet 30. In addition, when embossing and anti-fogging agent treatment are performed on the top sheet 30, when oil-soluble vitamin E and water-soluble vitamin C are used, the water-solubility of the anti-fogging agent containing vitamin C that is easily broken by heat. If embossing is performed before applying the components, the activity of vitamin C is not impaired by the heat of embossing.

The amount of use of the antioxidant / reducing agent can be determined as appropriate, but the content in the anti-fogging agent is preferably 5% by weight or more for each of the antioxidants and the content in the article member. Preferably, the antioxidant and the reducing agent are each 0.1 to 1.0 g / m ² .

  If there is too little antioxidant, there exists a possibility that the antioxidant effect may be insufficient, and if too much, cost effectiveness will fall. Moreover, when there are too few reducing agents, the maintenance period of an antioxidant effect will become short, and when too much, the antioxidant action by antioxidant will be inhibited and cost effectiveness will fall.

On the other hand, two or more kinds of antioxidants are used in combination, and an antioxidant having a relatively strong antioxidant effect is contained in the core of the microcapsule in order to achieve the desired balance of the effects of each component, so that the relative oxidation is achieved. It is one preferable form to contain an antioxidant having a weak prevention effect in the shell of the microcapsule. Therefore, in the present invention, the core consisting of vitamin E group, Ru using microcapsules coated with a shell made of a lipid of vitamin A group.

  The antifoggant of the present invention preferably contains an emollient agent. The emollient is preferably a liquid or semi-solid oily component at room temperature (25 ° C.). The oil component can also be applied as a solvent for oil-soluble vitamin E. Known substances can be used as the emollient, but fatty acid ester compounds are preferred, and glycerin fatty acid esters are particularly preferred. The glycerin fatty acid ester may be any of monoglyceride, diglyceride, and triglyceride. The carbon number of the fatty acid of the glycerin fatty acid ester is 2 to 35, preferably 8 to 22. Particularly preferred are stearic acid monoglyceride, lauric acid monoglyceride, and coconut oil fatty acid triglyceride. Coconut oil fatty acid triglyceride is preferable because of its high safety. Triglycerides are preferable in that they are components constituting sebum.

  The present invention can be applied to absorbent articles such as paper diapers, sanitary napkins, incontinence pads, and absorbent pads used in combination with diaper covers.

It is a perspective view of a pants-type paper diaper. It is an expanded state top view of a pants-type paper diaper. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is an expanded state top view of a tape type paper diaper. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. It is a top view of a convex roll. It is the sectional view on the AA line of FIG. It is a top view of a concave roll. It is the BB sectional drawing of FIG. It is a top view of the state which attached the convex roll and the concave roll. It is CC sectional view taken on the line of FIG. It is a top view of a convex roll. It is the DD sectional view taken on the line of FIG. It is a top view of a concave roll. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is a top view of the state which attached the convex roll and the concave roll. It is the GG sectional view taken on the line of FIG. It is the HH sectional view taken on the line of FIG.

DESCRIPTION OF SYMBOLS 12 ... Exterior sheet, 12c ... Elastic expansion-contraction member, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorption element, 52 ... Filament, 54 ... Super absorbent polymer particle, 56 ... Absorber, 58 ... Cover sheet, 60 ... barrier cuffs, 64 ... barrier sheets, 80 ... holding sheets.

Claims (5)

At least a part that comes into contact with the skin of the wearer's wearing part is an absorbent article containing an anti-fogging agent,
The anti-fogging agent is a microcapsule comprising a core containing an antioxidant that prevents oxidation of a proximity substance by its own oxidation, and a shell containing an antioxidant other than the antioxidant contained in the core. And a reducing agent that reduces the oxidized antioxidant ,
Antioxidants contained in the core is vitamin E group, antioxidant contained in the shell Ru vitamin A Gundea,
An absorbent article characterized by the above. The vitamin E group are those comprising α-type of vitamin E 50% by weight or more, the absorbent article according to claim 1, wherein. The absorbent article according to claim 1 or 2 , wherein the reducing agent is a vitamin C group or coenzyme Q10.   The absorptive article according to any one of claims 1 to 3 in which said anti-fogging agent contains an emollient agent.   The anti-fogging agent is included in a liquid-permeable top sheet that covers a portion that comes into contact with the skin of the absorbent article, and the top sheet has a convex roll provided with a plurality of convex portions on the roll surface, and a roll surface. The absorbent article according to any one of claims 1 to 4, wherein the embossed roll is provided with a concave roll provided with a plurality of concave portions into which the convex portions are fitted.

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