JP2019103572A - Absorber and absorbent article containing the same - Google Patents

Abstract

To provide an absorber having water-absorbing resin powder, the absorber having excellent anti-odor performance for a long time.SOLUTION: An absorber contains water-absorbing resin powder, and alkanediol, the alkanediol has 12 carbon atoms, and the content of the alkanediol is 0.005 pts.mass-1.0 pts.mass relative to the water-absorbing resin powder 100 pts.mass.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent having a water absorbent resin powder, and more particularly to a technology for improving the deodorizing performance of the absorbent.

  Absorbent articles such as disposable diapers, sanitary napkins and incontinence pads absorb and retain body fluids such as urine and menstrual blood excreted from the body, but for unpleasant odor when used or discarded after use Measures are required.

  Heretofore, absorbent articles have been proposed which prevent such unpleasant odors. For example, Patent Document 1 discloses an absorbent product comprising a liquid-permeable top sheet, a back sheet, and an absorbent core located between the top sheet and the back sheet, wherein the absorbent product has a molecular weight of 136 An absorbent product is described which comprises a deodorizing system comprising the above-mentioned silica or metal silicate (except for transition metals) together with an absorbent gelling material (Patent Document 1 (Page 8, page 8). Line 23 to page 9, line 16)). Patent Document 2 is characterized in that one or more kinds of deodorants selected from organic amines, organic amine salts, or substances that react with excrement to generate organic amines are present. An article is described (see Patent Documents 2 (paragraphs 0010 to 0011)). In Patent Document 3, in the pet absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent provided between them, the absorbent is a fibrous absorbent. An absorbent article for pets containing (A), tea leaves and / or tea extract (B) and surfactant (C) having antibacterial properties is described (see Patent Document 3 (paragraph 0018)) ). Patent Document 4 describes an absorbent product comprising pentane-1,5-diol for reducing and / or removing odor from mammals (see Patent Document 4 (paragraph 0029)).

Japanese Patent Application Publication No. 11-512944 Japanese Patent Laid-Open No. 2002-102280 JP, 2009-232685, A Japanese Patent Application Publication No. 2009-517152

  Methods utilizing physical adsorption by porous materials such as silica have limited adsorption capacity and can sometimes reversibly release odorous components. In the method of using an organic amine or surfactant, such organic amine or surfactant is confined by the water absorbent resin, and the deodorizing effect is not exhibited. Since pentanediol has a small number of carbon atoms, it is easily influenced by the carboxy group of the water absorbent resin, and the deodorizing effect is insufficient.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an absorbent body having a water absorbing resin powder, which has excellent deodorizing performance over a long period of time.

  The absorber of the present invention contains a water-absorbent resin powder and an alkanediol, and the carbon number of the alkanediol is 12, and the content of the alkanediol is 100 parts by mass of the water-absorbent resin powder. It is characterized by being 0.005 mass part-1.0 mass part.

  When the absorber contains an alkanediol having 12 carbon atoms, the deodorizing action of the alkanediol can impart deodorizing performance to the absorber. In addition, since the alkanediol having 12 carbon atoms is unlikely to be affected by the carboxy group of the water-absorbent resin, the deodorizing effect can be sufficiently exhibited. Therefore, the absorber of the present invention has excellent deodorizing performance over a long period of time.

  The present invention also includes an absorbent article comprising the absorber.

  ADVANTAGE OF THE INVENTION According to this invention, in the absorber which has water absorbing resin powder, the absorber which has the outstanding deodorizing performance over a long period of time is obtained.

The top view of an example of the absorptive article of the present invention. The typical sectional view of the VV line of FIG.

  The absorber of the present invention contains a water-absorbent resin powder and an alkanediol. And carbon number of the said alkanediol is 12, Content of the said alkanediol is 0.005 mass part-1.0 mass part with respect to 100 mass parts of said water absorbing resin powder. When the absorber contains an alkanediol having 12 carbon atoms, the deodorizing action of the alkanediol can impart deodorizing performance to the absorber. In addition, since the alkanediol having 12 carbon atoms is unlikely to be affected by the carboxy group of the water-absorbent resin, the deodorizing effect can be sufficiently exhibited. Therefore, the absorber of the present invention has excellent deodorizing performance over a long period of time.

(Water-absorbent resin powder)
The water absorbent resin powder will be described. The water-absorbent resin particles absorb and retain body fluids such as urine and menstrual blood excreted from the user. The water-absorbent resin powder used in the present invention is not particularly limited, but it is preferable to use a cross-linked polymer containing acrylic acid as a component and in which at least a part of its carboxy group is neutralized. . 50 mass% or more is preferable, as for the content rate of the acrylic acid component which comprises the said crosslinked polymer, 90 mass% or more is more preferable, 95 mass% or more is more preferable, 99 mass% or less is preferable, 97 mass% or less More preferable. If the content rate of an acrylic acid component is in the said range, the water-absorbent resin powder obtained will be easy to express desired absorption performance.

  The cation for neutralizing at least a part of the carboxy group of the crosslinked polymer is not particularly limited. Examples thereof include alkali metal ions such as lithium, sodium and potassium; and alkaline earth metal ions such as magnesium and calcium. be able to. Among these, it is preferable that at least a part of the carboxy group of the crosslinked polymer is neutralized by a sodium ion. The neutralization of the carboxy group of the crosslinked polymer may be carried out by neutralizing the carboxy group of the crosslinked polymer obtained by polymerization, or a crosslinked polymer using a previously neutralized monomer. May be formed.

60 mol% or more is preferable and, as for the neutralization degree of the carboxy group of a crosslinked polymer, 65 mol% or more is more preferable. If the degree of neutralization is too low, the absorption performance of the resulting water-absorbent resin powder may be reduced. Further, the upper limit of the degree of neutralization is not particularly limited, and all of the carboxy groups may be neutralized. The degree of neutralization is determined by the following equation.
Degree of neutralization (mol%) = 100 × "mole number of neutralized carboxy group of crosslinked polymer" / "total number of moles of carboxy group possessed by crosslinked polymer (including neutralized and unneutralized)"

  The crosslinked polymer is obtained by polymerizing an unsaturated monomer composition containing (a1) a water-soluble ethylenically unsaturated monomer and / or (a2) a hydrolysable monomer, and (b) an internal crosslinking agent. Are preferred.

  As the water-soluble ethylenically unsaturated monomer (a1), for example, a monomer having at least one water-soluble substituent and an ethylenically unsaturated group can be used. By water soluble monomer is meant a monomer which has the property of being soluble in at least 100 g of water at 25 ° C. The (a2) hydrolyzable monomer is hydrolyzed by the action of water at 50 ° C., if necessary, a catalyst (acid, base, etc.) to form (a1) a water-soluble ethylenically unsaturated monomer. (A2) The hydrolysis of the hydrolyzable monomer may be either during or after polymerization of the crosslinked polymer, but any of these may be used, but after polymerization is preferable from the viewpoint of the molecular weight of the resulting water-absorbent resin powder.

  Examples of the water-soluble substituent include, for example, a carboxy group, a sulfo group, a sulfooxy group, a phosphono group, a hydroxy group, a carbamoyl group, an amino group, or a salt thereof and an ammonium salt. Salts), salts of sulfo groups (sulfonates) and ammonium salts are preferred. Further, examples of the salt include alkali metal salts such as lithium, sodium and potassium, and alkaline earth metal salts such as magnesium and calcium. The ammonium salt may be either a salt of a primary to tertiary amine or a quaternary ammonium salt. Among these salts, alkali metal salts and ammonium salts are preferable, alkali metal salts are more preferable, and sodium salts are further preferable from the viewpoint of absorption characteristics.

  The water-soluble ethylenically unsaturated monomer having a carboxy group and / or a salt thereof is preferably a C3-C30 unsaturated carboxylic acid and / or a salt thereof. Specific examples of the water-soluble ethylenically unsaturated monomer having a carboxy group and / or a salt thereof include (meth) acrylic acid, (meth) acrylates, unsaturated monocarboxylic acids such as crotonic acid and cinnamic acid, and / or Or salts thereof; unsaturated dicarboxylic acids such as maleic acid, maleic acid salt, fumaric acid, citraconic acid and itaconic acid and / or salts thereof; monobutyl ester of maleic acid, monobutyl ester of fumaric acid, ethyl carbitol mono of maleic acid And esters, monoalkyl (1 to 8 carbon atoms) esters of unsaturated dicarboxylic acids such as ethyl carbitol monoester of fumaric acid, monobutyl ester of citraconic acid, glycol monoester of itaconic acid, and / or a salt thereof. In the description of the present invention, "(meth) acrylic" means "acrylic" and / or "methacrylic".

  The hydrolyzable monomer (a2) is not particularly limited, but is preferably an ethylenically unsaturated monomer having at least one hydrolyzable substituent which becomes a water-soluble substituent by hydrolysis. Examples of the hydrolyzable substituent include a group containing an acid anhydride, a group containing an ester bond, a cyano group and the like.

  As an ethylenically unsaturated monomer which has a group containing an acid anhydride, a C4-C20 unsaturated dicarboxylic acid anhydride etc. are used, A maleic anhydride, itaconic acid anhydride, a citraconic acid anhydride etc. are mentioned. Examples of ethylenically unsaturated monomers having a group containing an ester bond include lower alkyl esters of monoethylenically unsaturated carboxylic acids such as methyl (meth) acrylate and ethyl (meth) acrylate; and vinyl acetate, acetate Esters of monoethylenically unsaturated alcohols such as (meth) allyl are mentioned. Examples of the ethylenically unsaturated monomer having a cyano group include (meth) acrylonitrile and nitrile compounds containing a vinyl group having 3 to 6 carbon atoms such as 5-hexene nitrile.

  Examples of the water soluble ethylenic unsaturated monomer (a1) and the hydrolyzable monomer (a2) further include Japanese Patent No. 3648553, Japanese Patent Laid-Open Nos. 2003-165883, 2005-75982, and Japanese Patent Laid-Open No. 2005 The thing of-95759 gazette can be used. The (a1) water-soluble ethylenically unsaturated monomer and the (a2) hydrolyzable monomer may be used alone or as a mixture of two or more.

  As the unsaturated monomer composition, in addition to the (a1) water-soluble ethylenically unsaturated monomer and the (a2) hydrolyzable monomer, (a3) other vinyl monomers copolymerizable therewith can be used. As copolymerizable (a3) other vinyl monomers, hydrophobic vinyl monomers and the like can be used, but are not limited thereto.

  (A3) As the other vinyl monomers, those described in Japanese Patent No. 3648553, Japanese Patent Laid-Open No. 2003-165883, Japanese Patent Laid-Open No. 2005-75982, and Japanese Patent Laid-Open No. 2005-95759 can be further used. Can.

  In the present invention, from the viewpoint of obtaining a crosslinked polymer containing acrylic acid as a main component, (a1) acrylic acid or acrylic acid as (a1) water-soluble ethylenically unsaturated monomer and / or (a2) hydrolyzable monomer It is preferable to use an acid salt or (a2) a hydrolyzable monomer that forms acrylic acid or an acrylic acid salt upon hydrolysis. The content of (a1) acrylic acid or acrylic acid salt in the unsaturated monomer composition forming a crosslinked polymer, or (a2) hydrolyzable monomer generating acrylic acid or acrylic acid salt upon hydrolysis is 50 mass% or more is preferable, 90 mass% or more is more preferable, 95 mass% or more is more preferable, 99 mass% or less is preferable, and 97 mass% or less is more preferable.

  (B) As the internal crosslinking agent, (b1) an internal crosslinking agent having two or more ethylenically unsaturated groups, (b2) (a1) a water-soluble substituent of a water-soluble ethylenically unsaturated monomer and / or (a2) (B3) (an internal crosslinking agent having at least one functional group capable of reacting with a water-soluble substituent formed by hydrolysis of a hydrolyzable monomer, and having at least one ethylenically unsaturated group, a1) an internal crosslinking agent having two or more functional groups capable of reacting with the water-soluble substituent of the water-soluble ethylenically unsaturated monomer and / or the water-soluble substituent formed by hydrolysis of the (a2) hydrolyzable monomer It can be mentioned.

  As the internal crosslinking agent (b), an internal crosslinking agent having two or more ethylenically unsaturated groups is preferable from the viewpoint of absorption performance (particularly, absorption amount, absorption rate), etc., and a polyol having 2 to 10 carbon atoms The poly (meth) allyl ether is more preferred, triallyl cyanurate, triallyl isocyanurate, tetraaryloxyethane or pentaerythritol triallyl ether is more preferred, and pentaerythritol triallyl ether is most preferred.

  (B) As the internal crosslinking agent, those described in Japanese Patent No. 3648553, Japanese Patent Application Laid-Open No. 2003-1658883, Japanese Patent Application Laid-Open No. 2005-75982 and Japanese Patent Application Laid-Open No. 2005-95759 can be further used. it can.

  As the polymerization form of the crosslinked polymer, conventionally known methods can be used, and solution polymerization method, emulsion polymerization method, suspension polymerization method, reverse phase suspension polymerization method can be applied. Moreover, as a shape of the polymerization liquid at the time of superposition | polymerization, thin film shape, a spray form, etc. may be sufficient. As a method of polymerization control, adiabatic polymerization method, temperature control polymerization method, isothermal polymerization method and the like can be applied. As a polymerization method, a solution polymerization method is preferable, and an aqueous solution polymerization method is more preferable because it is not necessary to use an organic solvent or the like and advantageous in terms of production cost.

  The crosslinked polymer can be milled after drying. The pulverizing method is not particularly limited, and, for example, a usual pulverizing apparatus such as a hammer type pulverizer, an impact type pulverizer, a roll type pulverizer, and a shet stream type pulverizer can be used. The particle size of the pulverized crosslinked polymer can be adjusted by sieving, if necessary.

  The weight-average particle size (μm) of the crosslinked polymer when sieving as necessary is preferably 300 μm or more, more preferably 350 μm or more, still more preferably 400 μm or more, preferably 500 μm or less, more preferably 480 μm or less, more preferably Preferably it is 450 micrometers or less. If the weight average particle diameter (μm) of the crosslinked polymer is within the above range, the absorption performance will be further improved.

  The weight-average particle size is determined using the low tap test sieve shaker and a standard sieve (JIS Z8801-1: 2006) according to Perry's Chemical Engineers Handbook 6th Edition (McGrow Hill Book, 1984) , Page 21). That is, JIS standard sieves are combined in the order of 1000 μm, 850 μm, 710 μm, 500 μm, 425 μm, 355 μm, 250 μm, 150 μm, 125 μm, 75 μm and 45 μm from the top, and a tray. About 50 g of the measurement particles are placed in the uppermost sieve and shaken for 5 minutes with a low tap test sieve shaker. Weigh the mass of the measurement particles on each sieve and pan, determine the mass fraction of the particles on each sieve with the total as 100% by mass, and calculate the mass fraction of the particles on each sieve. After plotting the mass fraction on the vertical axis), a line connecting points is drawn to obtain a particle diameter corresponding to 50 mass% in mass fraction, which is defined as a weight average particle diameter.

  The crosslinked polymer can be further surface crosslinked if necessary. As a crosslinking agent (surface crosslinking agent) for performing surface crosslinking, the same thing as (b) internal crosslinking agent can be used. As a surface crosslinking agent, from the viewpoint of the absorption performance of the water-absorbent resin powder, etc., by the hydrolysis of the water-soluble substituent of the (b3) (a1) water-soluble ethylenically unsaturated monomer and / or the (a2) hydrolyzable monomer The crosslinking agent having at least two or more functional groups capable of reacting with the water-soluble substituent to be formed is preferable, more preferably polyvalent glycidyl, still more preferably ethylene glycol diglycidyl ether and glycerin diglycidyl ether, most preferably ethylene glycol di It is glycidyl ether.

  The crosslinked polymer may be further treated with a surface modifier. As surface modifiers, polyvalent metal compounds such as aluminum sulfate, potassium alum, ammonium alum, sodium alum, (poly) aluminum chloride and hydrates thereof; polycationic compounds such as polyethyleneimine, polyvinylamine and polyallylamine Inorganic fine particles; surface modifier containing a hydrocarbon group having a fluorine atom; surface modifier having a polysiloxane structure and the like.

  The method for treating the crosslinked polymer with a surface modifier is not particularly limited as long as the surface modifier is treated so as to be present on the surface of the crosslinked polymer. However, the surface modifier is preferably mixed with the dried product of the crosslinked polymer from the viewpoint of controlling the amount of the surface modifier on the surface. In addition, it is preferable to perform mixing uniformly.

  The shape of the water-absorbent resin powder is not particularly limited, and examples thereof include irregularly crushed, scaly, pearly, and rice grains. Among these, from the viewpoint of good interlocking with the fibrous material in paper diaper applications and the like and no fear of falling off from the fibrous material, an irregularly crushed material is preferable.

  The water-absorbent resin powder contains additives such as preservatives, fungicides, antibacterial agents, antioxidants, UV absorbers, colorants, fragrances, deodorants, inorganic powders, organic fibrous materials, etc. Can. As an additive, what is illustrated by Unexamined-Japanese-Patent No. 2003-225565, Unexamined-Japanese-Patent No. 2006-131767, etc. can be mentioned.

(Alkanediol)
The absorber of the present invention contains an alkane diol. The alkane diol has 12 carbon atoms. Since the alkanediol having 12 carbon atoms is hardly affected by the carboxy group of the water-absorbent resin, the deodorizing effect can be sufficiently exhibited.

The alkanediol may be any of a linear alkanediol, a branched alkanediol, and an alkanediol having a cyclic structure, but a linear alkanediol is preferable. As linear alkanediol, 1,2-dodecanediol, 1,12-dodecanediol, 5,6-dodecanediol etc. are mentioned. Among these, 1,2-dodecanediol (CH ₃ (CH ₂ ) ₉ CH (OH) CH ₂ OH) is preferable as the alkanediol.

(Absorber)
The absorber is composed of at least one water absorbing layer. The water absorbing layer contains the water absorbing resin powder and the alkanediol as a water absorbing material. The content of alkanediol in the water absorbing layer is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, and still more preferably 0.05 parts by mass or more with respect to 100 parts by mass of the water absorbing resin powder. 1.0 mass part or less is preferable, More preferably, it is 0.75 mass part or less, More preferably, it is 0.5 mass part or less. When the content is 0.005 parts by mass or more, the growth of bacteria can be suppressed, and the generation of odor can be suppressed.

  As a method of adding the alkanediol to the water-absorbent resin powder, a method of mixing the water-absorbent resin powder and the powdery alkanediol; a method of spraying an alkanediol-containing liquid onto the water-absorbent resin powder is mentioned Be When an alkanediol-containing liquid is used, the solvent may, for example, be water or an alcohol such as ethanol. Moreover, it is preferable that the addition amount of the alkanediol containing liquid with respect to a water absorbing resin powder sets the addition amount of the solvent with respect to 100 mass parts of water absorbing resin powder to 10 mass parts-100 mass parts.

  The water absorbing layer may further contain a water absorbing fiber as a water absorbing material. Examples of the water absorbent fibers include pulp fibers, cellulose fibers, rayon and acetate fibers. When these water-absorbent fibers are contained, it is preferable that the absorbent further contains fumaric acid. By blending fumaric acid, it is possible to suppress the generation of an offensive odor due to the body fluid absorbed by these water absorbent fibers. In addition, fumaric acid may be arrange | positioned to a water absorption layer, and may be arrange | positioned to the nonwoven fabric sheet which wraps an absorptive material, and the top sheet of absorbent articles.

  The water absorbing layer may contain a fiber base in addition to the water absorbing resin powder. Examples of the fiber base include heat fusion fibers. Heat fusible fibers are used to enhance shape retention. As a specific example of heat fusion | melting fiber, polyolefin fiber, such as polyethylene and a polypropylene, polyester fiber, a composite fiber, etc. are used, for example. A water absorbing layer containing only a water absorbing resin powder as a water absorbing material can be thinned. The water absorption layer containing a fiber base material is excellent in the dispersibility of a bodily fluid.

  The structure of the said absorber is not specifically limited, What is necessary is just to contain the said water absorbing resin powder and the said alkane diol. As a structure of the said absorber, what fixed the mixture of water absorbing resin powder and alkanediol to paper sheets or liquid-permeable sheets, such as tissue paper; liquid-permeability of the mixture of water absorbing resin powder and alkanediol What was wrapped by a sheet; What pinched | interposed the mixture of a water absorbing resin powder and alkane diol by the liquid-permeable 1st sheet and 2nd sheet | seat; In addition, the planar view shape of the said absorber is not specifically limited, For example, a rectangle, an hourglass type, a gourd type | mold, a feathers board type etc. are mentioned.

  The shape in plan view of the water absorbing layer and the absorber is not particularly limited, and examples thereof include a rectangular shape, an hourglass shape, a gourd shape, and a feather sheet type. In addition to the water absorbing layer, the absorber may have an adhesive layer for fixing the water absorbing resin powder.

(Absorbent articles)
The absorbent article of the present invention will be described. The absorbent article of the present invention is characterized by including the above-mentioned absorbent. As the absorbent article, for example, an absorbent body containing the water absorbent resin particles and alkanediol, a top sheet disposed on the skin surface side of the absorbent body, and an outer surface side of the absorbent body There is a structure having a back sheet.

  The top sheet is disposed on the most wearer side of the absorbent article, and quickly captures the body fluid of the wearer and transfers it to the absorber. The top sheet may be a liquid-permeable sheet material, for example, a non-woven fabric formed of hydrophilic fibers. Non-woven fabrics used as top sheets are, for example, point-bonded non-woven fabrics, air-through non-woven fabrics, spun lace non-woven fabrics, spun-bonded non-woven fabrics, and cellulose, rayon, cotton, etc. are usually used as hydrophilic fibers forming these non-woven fabrics. . In addition, the liquid-permeable nonwoven fabric formed by the hydrophobic fiber (for example, polypropylene, polyethylene, polyester, polyamide) which hydrophilized the surface with surfactant as a top sheet may be used.

  The back sheet is disposed on the outermost surface side of the absorbent article, and prevents body fluid and the like from leaking out. As a liquid-impervious sheet used for the back sheet, for example, a water-repellent or liquid-impervious non-woven fabric (for example, a spunbond non-woven fabric) formed of hydrophobic fibers (for example, polypropylene, polyethylene, polyester, polyamide) Or melt-blown non-woven fabric, SMS (spun-bond, melt-blown, spun-bond) non-woven fabric) or water-repellent or liquid-impervious plastic film, and the body fluid reaching the liquid-impervious sheet stains the outer side of the absorbent article. To prevent When a plastic film is used for the liquid-impervious sheet, it is preferable to use a moisture-permeable (air-permeable) plastic film from the viewpoint of preventing stuffiness and improving the comfort of the wearer. In addition, a paper sheet may be disposed between the plastic film and the absorber for further diffusibility and shape stability.

  Next, specific application examples of the absorbent article of the present invention will be described. The absorbent article of the present invention includes, for example, absorbent articles used for absorbing bodily fluids discharged from the human body, such as disposable diapers, incontinence pads, sanitary napkins and the like.

  When the absorbent article is an incontinence pad or a sanitary napkin, for example, an absorbent is disposed between the top sheet and the back sheet. Examples of the shape of the incontinence pad and the sanitary napkin include a substantially rectangular shape, an hourglass shape, and a gourd shape. Moreover, the liquid-impervious side sheet may be provided in the width direction both sides of the said liquid-permeable top sheet as needed. The side sheets are joined to the top surfaces on both sides in the width direction of the top sheet, and the side sheets in the width direction from the joint point form a pair of rising flaps along the side edges of the absorber.

  In the case where the absorbent article is a disposable diaper, for example, a tape-type disposable diaper having a pair of fastening members provided on the left and right of the back back or front abdomen as the disposable diaper, A diaper; a pants-type disposable diaper in which a waist opening and a pair of leg openings are formed by joining a front abdomen and a back back.

  When the absorbent article is a disposable diaper, the disposable diaper forms, for example, a diaper body in which a laminate comprising an inner sheet and an outer sheet comprises a front abdomen and a back back and a crotch positioned between them. The absorbent body may be disposed between the top sheet and the back sheet at the crotch. Moreover, a disposable diaper consists of a laminated body by which an absorber is arrange | positioned between a top sheet and a back sheet, for example, and this laminated body has a crotch part located between these for abdomen, the back back, and these. It may be done. In addition, the front abdomen, the back back, and the crotch, when wearing the disposable diaper, the part to be applied to the wearer's ventral side is referred to as the front abdomen, and the part to be applied to the wearer's butt side is referred to as the back dorsal The part located between the abdomen and the back and applied between the wearer's crotch is referred to as the crotch. The inner sheet is preferably hydrophilic or water repellent, and the outer sheet is preferably water repellent.

  The absorbent article is preferably provided with rising flaps along both side edges of the absorbent. The rising flaps may be provided, for example, on both widthwise side edges of the upper surface of the absorber, or may be provided on both sides in the width direction of the absorber. By providing the rising flaps, it is possible to prevent the side leakage of body fluid. The rising flaps may be formed by raising the inward ends of side sheets provided on both sides in the width direction of the top sheet. The rising flaps and the side sheets are preferably water repellent.

  Next, the absorbent article of the present invention will be described with reference to FIGS. 1 and 2 taking an incontinence pad as an example. FIG. 1 represents a plan view of the incontinence pad. FIG. 2 depicts a V-V cross-sectional view of the incontinence pad of FIG. In the drawing, the arrow B is defined as the width direction, and the arrow A is defined as the longitudinal direction. Also, the direction on the surface formed by the arrows A and B is defined as the planar direction.

  The incontinence pad 11 has a liquid-permeable top sheet 12, a liquid-impervious back sheet 13, and an absorbent body 1 disposed therebetween. The absorbent body 1 is formed by fixing the water absorbent resin particles 2, the alkanediol 3 and the fiber base 4 to a tissue paper 14.

  The top sheet 12 is disposed to face the skin of the wearer's crotch, and transmits the body fluid of the wearer. The body fluid having passed through the top sheet 12 is taken into the absorbent body 1 and absorbed by the water absorbent resin particles 2.

  Side sheets 15 extending in the longitudinal direction A of the incontinence pad 11 are joined to both side edges in the width direction B of the top sheet 12. The side sheet 15 is made of a liquid impermeable plastic film, a water repellent non-woven fabric, or the like. The side sheet 15 is provided with a rising elastic member 16 at the inward end in the width direction of the incontinence pad 11. At the time of use of the incontinence pad 11, the inward end of the side sheet 15 rises toward the wearer's skin by the contraction force of the standing elastic member 16, thereby preventing the side leakage of the body fluid.

  In addition, although the aspect which has the absorber 1 of one layer is illustrated in FIG. 2, the structure of the absorber 1 is not restricted to this. Although the aspect which has the absorbent article 11 having one absorber 1 is illustrated in FIG. 2, two or more absorbers 1 may be arrange | positioned.

  In FIG. 2, the water absorbing resin particles 2, the alkanediol 3 and the fiber base 4 are fixed to the tissue paper 14 to form the absorbent body 1. However, these water absorbing resin particles 2, the alkanediol 3 and the fiber base are 4 may be covered with tissue paper 14. In addition, the absorbent body 1 may have a configuration in which the water absorbent resin particles 2, the alkanediol 3 and the fiber base 4 are held by the first sheet and the second sheet. In addition, although the aspect which the absorber 1 contains the fiber base material 4 in figure is illustrated in figure, it is not necessary to contain the fiber base material 4. FIG.

  Specific examples of the absorbent article of the present invention include absorbent articles used to absorb body fluids discharged from the human body, such as disposable diapers, sanitary napkins, incontinence pads and the like.

  EXAMPLES Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited by the following examples, and all changes and embodiments within the scope of the present invention are within the scope of the present invention. It is included in the range.

[Evaluation method]
(Deodorant)
The absorbent article (incontinence pad) was worn on 20 adult urine panelers, and after 4 hours, the absorbent article was removed. When removing the said absorbent article, the sensory test of the presence or absence of the odor was carried out. Moreover, the removed absorbent article was stored in a 40 ° C. thermostat for one month, and after one month, it was sensory-tested for the presence or absence of odor. In the sensory test, six evaluations were performed based on the following evaluation criteria.
(Evaluation criteria)
5 points: intense odor 4 points: strong odor 3 points: easily detectable odor 2 points: weak odor 1 to know what smell it is 1 point: finally detectable odor 0 points: odorless

[Production of Absorbent Article]
A deodorant-containing liquid was prepared by dissolving the deodorant shown in Table 1 in 200 ml of a solvent (hydrous ethanol having an ethanol content of 80% (v / v)). In addition, the addition amount of the deodorizing agent to the solvent was suitably adjusted according to the usage-amount of the deodorizing agent with respect to the water absorbing resin powder made desired. After applying 10 ml of the obtained deodorant-containing liquid to 20 g of a water-absorbent resin powder, it was dried in a thermostatic chamber at 30 ° C. for 30 minutes to prepare a deodorant-containing water-absorbent resin powder. After 16.5 g of the obtained deodorant-containing water-absorbing resin powder was dispersed on 33.5 g of the pulp fiber layer, it was coated with tissue paper to prepare an absorber. The obtained absorbent was sandwiched between a top sheet (air through nonwoven fabric (25 g / m ² basis weight)) and a back sheet (polyethylene film) to produce an absorbent article (incontinence pad). The deodorizing properties of each absorbent article were evaluated, and the results are shown in Table 1.

ＳＡＰ１：ＳＤＰグローバル社製、「ＩＭ９３０」
ＳＡＰ２：住友精化社製、「ＳＡ６０Ｓ」

SAP1: Made by SDP Global, "IM 930"
SAP2: Sumitomo Seika Co., Ltd., "SA60S"

  Absorbent article No. 1 to 5 contains the water-absorbent resin powder and an alkanediol having 12 carbon atoms, and the content of the alkanediol is 0.005 parts by mass to 1 part per 100 parts by mass of the water-absorbent resin powder. .0 parts by mass. For these absorbent articles no. As for 1 to 5, the deodorizing evaluation immediately after removal and one month after is 2 in all. Therefore, these absorbent article Nos. 1 to 5 have excellent deodorizing performance over a long period of time.

  Absorbent article No. In 7 and 8, the absorber contains a water-absorbent resin powder and an alkanediol having 12 carbon atoms, but the content of the alkanediol is less than 0.005 parts by mass with respect to 100 parts by mass of the water-absorbent resin powder In the case of Absorbent article No. 9 to 15 are the cases where the carbon number of the alkanediol is other than 12. For these absorbent articles no. 7-15 were inadequate in the deodorizing performance of the absorbent article.

  Absorbent article No. 16 to 19 are cases where the absorber contains an antibacterial agent other than an alkanediol having 12 carbon atoms and a deodorant. For these absorbent articles no. 16 to 19 had deodorizing performance immediately after the removal of the absorbent article, but its effective period was short, and did not have deodorizing performance after one month.

  The absorber of the present invention can be suitably used, for example, in an absorbent article used to absorb body fluid discharged from the human body, and in particular, suitably used as an absorbent article such as an incontinence pad, disposable diaper, sanitary napkin and the like it can.

1: Absorbent body 2: Water-absorbent resin powder 3: Alkanediol 4: Fiber base 11: Incontinence pad (absorbent article) 12: Top sheet 13: Back sheet 14: Tissue paper 15: 15 Side seat, 16: elastic member for standing up

Claims (3)

Containing water-absorbent resin powder and alkanediol,
The carbon number of the alkanediol is 12;
An absorber characterized in that the content of the alkanediol is 0.005 parts by mass to 1.0 parts by mass with respect to 100 parts by mass of the water absorbent resin powder.   The absorber according to claim 1, wherein the alkanediol is 1,2-dodecanediol. An absorbent article comprising the absorbent according to claim 1 or 2.

Images