JP6436795B2 - Fumaric acid-containing fiber, fumaric acid-containing fiber assembly and absorber - Google Patents

Description

  The present invention relates to a fumaric acid-containing fiber, a fumaric acid-containing fiber assembly, and an absorbent body.

  Sanitary goods such as disposable diapers, sanitary napkins, and incontinence pads are used in a state where they can directly touch the user's skin. Therefore, when the top sheet becomes alkaline due to body fluids such as urination and menstrual blood, an environment in which bacteria grow and odor is likely to occur. Therefore, it has been proposed to add antibacterial agents such as silver ions and benzalkonium chloride to hygiene products.

  It has also been proposed to add a pH adjuster to sanitary goods. For example, Patent Document 1 describes an absorbent article in which a water-absorbent resin and a pH adjuster are arranged at different sites inside the absorbent article (see Patent Document 1 (Claim 1, FIGS. 1 to 3)). . Patent Document 2 describes a disposable napkin using a cellulose stuffing impregnated with an ethanol solution of fumaric acid (see Patent Document 2 (Example 2)).

Japanese Patent Laid-Open No. 62-28402 US Pat. No. 3,707,148

  Silver ions and benzalkonium chloride are used as general antibacterial agents used in hygiene products. However, since chlorine derived from the bleaching agent remains in the pulp used for the absorbent article, silver ions react with the residual chlorine to reduce the antibacterial performance. Moreover, when benzalkonium chloride is absorbed by the superabsorbent resin together with the body fluid, it reacts with sodium in the resin, and the antibacterial deodorizing effect decreases with time.

  It has also been proposed to use citric acid as a pH adjuster in absorbent articles. However, citric acid has an antibacterial effect due to antibacterial effects, but when it comes into contact with body fluids, it dissolves and lowers the surrounding pH to 4 or less, causing skin troubles.

  Further, fumaric acid is known as a pH regulator having an antibacterial effect. However, since fumaric acid is sparingly water-soluble, it is usually imparted to the absorbent article in a particulate form (such as a particle dispersion). In this case, a lump of fumaric acid particles is generated on the surface of the applied site, and an excessive pH drop may occur partially.

  This invention is made | formed in view of the said situation, and aims at providing the fumaric acid containing fiber containing a fumaric acid.

  The fumaric acid-containing fiber of the present invention has a base fiber and fumaric acid, the base fiber contains a water-absorbing fiber, and the fumaric acid contacts the water-absorbing fiber and the fumaric acid-containing aqueous solution. Then, it is given by removing water, The addition amount of the said fumaric acid is 0.0001 mass part-0.15 mass part with respect to 100 mass parts of water absorbing fibers, It is characterized by the above-mentioned. .

  The water absorbent fibers are preferably cellulose fibers, more preferably natural cellulose fibers and / or regenerated cellulose fibers. The base fiber preferably contains cellulose fiber and synthetic fiber.

  The present invention also includes a fumaric acid-containing fiber assembly containing the fumaric acid-containing fiber. The fiber assembly is preferably a nonwoven fabric, a woven fabric, or a knitted fabric. Further, the present invention also includes an absorbent body containing a water absorbent resin powder and the fumaric acid-containing fiber as a water absorbent material.

  By using the fumaric acid-containing fiber and the fumaric acid-containing fiber assembly of the present invention, it is possible to prevent the generation of malodor and suppress the growth of spoilage bacteria in the used sanitary goods.

It is a figure which shows the growth thermogram by a micro calorimeter. It is a figure which shows an odor test result. It is a figure which shows the growth thermogram by a micro calorimeter.

[Fumaric acid-containing fiber]
The fumaric acid-containing fiber of the present invention has a base fiber and fumaric acid. And the said base fiber contains a water absorbing fiber, and the said fumaric acid is provided by removing the water, after making the said base fiber and the fumaric acid containing aqueous solution contact. When the water-absorbing fiber is brought into contact with the aqueous solution containing fumaric acid, the water-absorbing fiber absorbs water and takes in dissolved fumaric acid molecules, and when water is removed, fumaric acid molecules exist inside the water-absorbing fiber It becomes. As described above, fumaric acid present in the water-absorbing fiber is not washed away by body fluids and the like, and can exhibit deodorization and antibacterial effects over a long period of time.

  The water-absorbing fiber is not particularly limited as long as it has water absorption. The water absorption means that liquid water enters the fiber by a capillary phenomenon or the like.

  Examples of the water absorbent fibers include cellulose fibers, polyvinyl alcohol fibers, ethylene vinyl alcohol fibers, and polyacrylic acid sodium salt fibers. Examples of the cellulose fiber include natural cellulose fiber, regenerated cellulose fiber, and semi-synthetic cellulose fiber. Examples of natural cellulose fibers include cotton, hemp and wood pulp. Examples of the regenerated cellulose fiber include rayon, polynosic, cupra, and lyocell. Examples of the semisynthetic cellulose fiber include diacetate fiber and triacetate fiber. Among these, natural cellulose fibers and / or regenerated cellulose fibers are preferable, and natural cellulose fibers are more preferable.

  The water-absorbing fiber preferably has an amount of physiological saline absorbed per gram of 0.2 g or more, more preferably 0.5 g or more, still more preferably 1.0 g or more, and preferably 5.0 g or less, More preferably, it is 3.5 g or less, More preferably, it is 2.0 g or less.

  The base fiber may contain a synthetic fiber other than the water-absorbing fiber. In this case, the content of the water-absorbing fiber in the base fiber is preferably 20% by mass or more, more preferably 30% by mass or more, still more preferably 50% by mass or more, and preferably 100% by mass or less. More preferably, it is 98 mass% or less, More preferably, it is 90 mass% or less.

  Examples of the synthetic fibers include polyolefin fibers such as polyethylene fibers and polypropylene fibers; polyester fibers such as polyethylene terephthalate fibers, polytrimethylene terephthalate fibers and polybutylene terephthalate fibers; polyamide fibers such as polyamide 6 fibers and polyamide 66 fibers; Acrylic fiber such as acrylonitrile fiber; polyvinyl alcohol fiber; polyurethane fiber; polyvinyl chloride fiber;

  The fumaric acid is provided by removing water after bringing the base fiber (water absorbent fiber) into contact with the fumaric acid-containing aqueous solution. By providing fumaric acid in this way, fumaric acid is taken into the water-absorbing fiber.

  Examples of the method for bringing the water-absorbing fiber into contact with the fumaric acid-containing aqueous solution include a method of immersing the water-absorbing fiber in the fumaric acid-containing aqueous solution. Water is used as the solvent of the fumaric acid-containing aqueous solution. The solvent preferably does not contain an organic solvent (methanol, ethanol, acetone, glycerin, ethylene glycol, propylene glycol, etc.). When the solvent contains an organic solvent, fumaric acid is less likely to be taken into the water-absorbing fiber.

  The fumaric acid concentration in the fumaric acid-containing aqueous solution is preferably 0.0003% by mass or more, more preferably 0.003% by mass or more, still more preferably 0.015% by mass or more, and 0.3% by mass or less. More preferably, it is 0.15 mass% or less. If the fumaric acid concentration is 0.0003% by mass or more, the fumaric acid concentration does not become too low, and fumaric acid can easily enter the water-absorbing fiber. If the fumaric acid concentration is 0.15% by mass or less, Fumaric acid can be easily completely dissolved.

  The fumaric acid-containing aqueous solution preferably contains a thickener. Examples of the thickener include xanthan gum, pectin, guar gum, tamarind gum, carrageenan, gelatin, unsaturated carboxylic acid (co) polymer (for example, polyacrylic acid, isobutylene-maleic acid copolymer, diisobutylene-malein). Acid copolymers, styrene-maleic acid copolymers, styrene-maleic acid- (meth) acrylic acid ester copolymers, (meth) acrylic acid- (meth) acrylic acid ester copolymers, etc.), carboxylated polysaccharides (E.g., carboxymethyl cellulose) and salts thereof (e.g., organic amine salts, alkali metal salts, alkaline earth metal salts), naphthalene sulfonic acid formalin condensate, polystyrene sulfonic acid, and salts thereof (e.g., Organic amine salts, alkali metal salts, alkaline earth metal salts), Examples include inorganic acid (hydrochloric acid, phosphoric acid, etc.) salt or organic acid (formic acid, acetic acid, lactic acid, etc.) salt, etc. of livinyl alcohol, polyethylene glycol, N, N-dialkylaminoalkyl (meth) acrylate (co) polymer .

  The content of the thickener need not be specified, but is preferably 0.0000002 parts by mass or more, more preferably 0.001 parts by mass or more, and still more preferably 0.000 parts by mass with respect to 100 parts by mass of fumaric acid. 01 parts by mass or more, preferably 5 parts by mass or less, more preferably 0.5 parts by mass or less, and still more preferably 0.04 parts by mass or less.

  In addition to the thickener, the fumaric acid-containing aqueous solution used for processing contains organic acids such as citric acid and malic acid, antibacterial agents, deodorants, surfactants, oil agents used for spinning, etc. It can also be used.

  The method for removing water after bringing the resin fiber into contact with the fumaric acid-containing aqueous solution is not particularly limited, and examples thereof include natural drying. The drying temperature is preferably 15 ° C. or higher, more preferably 20 ° C. or higher, preferably 80 ° C. or lower, more preferably 60 ° C. or lower. The drying time is preferably 1 hour or longer, more preferably 24 hours or longer. If the drying time is 1 hour or more, it will be in a dry state to the extent that there is no problem in actual use.

  The amount of fumaric acid applied to 100 parts by mass of the resin fiber is preferably 0.0001 parts by mass or more, more preferably 0.001 parts by mass or more, preferably 0.15 parts by mass or less, more preferably 0. 05 parts by mass or less, more preferably 0.015 parts by mass or less. If the amount of fumaric acid applied is 0.0001 parts by mass or more, the deodorization and antibacterial effects of the fiber assembly using fumaric acid-containing fibers are further improved, and if it is 0.15 parts by mass or less, the fumaric acid concentration is increased. The bad influence to the skin resulting from passing too much can be suppressed. The amount of fumaric acid applied is determined by measuring the mass of fumaric acid in the solution after performing Soxhlet extraction with a large amount of ethanol on a fumaric acid-containing fiber having a predetermined mass and dissolving all fumaric acid. It is done.

[Fumaric acid-containing fiber assembly]
The present invention also includes a fumaric acid-containing fiber assembly containing the fumaric acid-containing fiber. Examples of the fiber aggregate include fiber sheets such as nonwoven fabrics, woven fabrics, and knitted fabrics, and those in which base fibers are not intentionally fixed and entangled.

  The fumaric acid-containing fiber aggregate may contain fibers other than the fumaric acid-containing fiber. Examples of other fibers include cellulosic fibers such as cellulose and rayon; polypropylene fibers, polyethylene fibers, polyester fibers, and polyamide fibers. In this case, the content of the fumaric acid-containing fiber in the fiber assembly is preferably 20% by mass or more, more preferably 30% by mass or more, and further preferably 40% by mass or more. If the content rate of a fumaric acid containing fiber is 20 mass% or more, a deodorization and an antimicrobial effect will improve more. It is also preferable that the fumaric acid-containing fiber aggregate consists only of the fumaric acid-containing fiber.

The fumaric acid content in the fumaric acid-containing fiber assembly is preferably 0.0001 parts by mass or more, more preferably 0.00015 parts by mass or more, and 3.5 parts by mass or less with respect to 100 parts by mass of the fiber. Preferably, it is 2.0 parts by mass or less, more preferably 1.0 part by mass or less. If the content of fumaric acid is 0.0001 parts by mass or more, the deodorization and antibacterial effects are further improved. If the content of fumaric acid is 3.5 parts by mass or less, adverse effects on the skin caused by excessively high fumaric acid concentration are suppressed. it can. The fumaric acid content is obtained by performing Soxhlet extraction on a fumaric acid-containing fiber aggregate cut into a predetermined size (for example, 1 cm ² ) using a large amount of ethanol (for example, 2 L) and dissolving all fumaric acid. It is calculated | required by measuring the mass of the fumaric acid in a solution. In addition, when spraying a fumaric acid containing aqueous solution on a fiber assembly so that it may mention later, it can also obtain | require from the fumaric acid density | concentration of a fumaric acid containing aqueous solution and the liquid quantity to spray.

  As the fumaric acid-containing fiber aggregate, a fiber aggregate is formed using the fumaric acid-containing fiber as a constituent fiber; a fiber aggregate not containing a fumaric acid-containing fiber as a constituent fiber and a fumaric acid-containing aqueous solution. After making it contact, what gave fumaric acid to water absorption fiber by removing water is mentioned.

  The fumaric acid-containing fiber and fumaric acid-containing fiber assembly of the present invention are sanitary articles such as disposable diapers, sanitary napkins, incontinence pads, and masks; Clothing such as clothes, side pads, stockings, gloves, caps, and apron; daily necessities such as towels, wipers, cooking sheets, drip sheets, wet tissues, bedding, furoshiki, tote bags, slippers, filters; industrial materials such as nets Can be suitably used.

[Absorber]
The absorbent body of the present invention contains the fumaric acid-containing fiber and a water absorbent resin powder as a water absorbent material. As the water absorbent resin powder, those conventionally used for absorbent articles can be used. The water absorbent resin powder may contain additives such as antibacterial agents, antioxidants, ultraviolet absorbers, colorants, fragrances, deodorants, inorganic powders, and organic fibrous materials. The absorbent body may contain a water absorbent fiber other than the fumaric acid-containing fiber as the water absorbent material.

  In the absorbent body, the content of the fumaric acid-containing fiber in the water-absorbing material is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, and 95% by mass or less. More preferably, it is 90 mass% or less, More preferably, it is 85 mass% or less. If it is 10% by mass or more, the deodorization and antibacterial effects are further improved, and if it is 90% by mass or less, adverse effects on the skin caused by excessively high fumaric acid concentration can be suppressed.

  In the absorbent body, the content of the water absorbent resin powder in the water absorbent material is preferably 15% by mass or more, more preferably 30% by mass or more, still more preferably 35% by mass or more, and 90% by mass or less. More preferably, it is 85 mass% or less, More preferably, it is 80 mass% or less.

  The absorbent body may contain synthetic fibers in order to improve moldability. The content of the other fiber base material in the absorbent body is preferably 50% by mass or less, more preferably 40% by mass or less, and still more preferably 30% by mass or less.

  The absorbent body of the present invention includes, for example, a material in which the water-absorbing material is wrapped in a liquid-permeable sheet; a liquid-permeable first sheet and a second sheet, and the first sheet and the second sheet The water-absorbing material is disposed between them.

  Examples of the liquid permeable sheet include tissue paper formed of hydrophilic fibers, particularly crepe paper and non-woven fabric. Examples of the nonwoven fabric include point bond nonwoven fabric, air-through nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and airlaid nonwoven fabric.

  The said 1st sheet | seat is a sheet | seat of the side contact | abutted on a skin surface, and permeate | transmits the water | moisture content of the bodily fluid from a wearer rapidly. The liquid permeable sheet can be used as the liquid permeable first sheet. The second sheet may be either a liquid-permeable sheet or a liquid-impermeable sheet depending on how the water-absorbing layer is used. As the liquid-impervious sheet, a water-repellent or liquid-impervious non-woven fabric formed of hydrophobic fibers or a water-repellent or liquid-impervious plastic film is used.

  The said absorber can be used for absorbent articles, such as a disposable diaper, a sanitary napkin, and an incontinence pad.

  Hereinafter, the present invention will be described in detail by way of examples. However, the present invention is not limited to the following examples, and all modifications and embodiments without departing from the gist of the present invention are not limited thereto. Included in range.

[Pharmacic acid-containing fiber]
Drug-containing fiber No. 1 (0.000010 parts by mass of fumaric acid)
A fumaric acid dispersion in which 30% by mass of fumaric acid is dispersed in an aqueous xanthan gum solution in water (manufactured by Daiichi Seimsha, fumaric acid dispersion “DF-30”, xanthan gum content relative to 100 parts by mass of fumaric acid is 0.01 (Parts by mass to 5 parts by mass) was dissolved to prepare a drug-containing aqueous solution having a fumaric acid concentration of 5.0 × 10 ⁻⁷ mass%. 20 g of this drug-containing aqueous solution was sprayed on 100 g of cellulose fibers (wood pulp) and dried with a dryer (set temperature: 50 ° C.) for 24 hours. The obtained drug-containing fiber No. 1 has a fumaric acid content of 0.000010 parts by mass with respect to 100 parts by mass of cellulose fibers.

Drug-containing fiber No. 2 (0.00010 parts by weight of fumaric acid)
Except that the concentration of fumaric acid in the drug-containing aqueous solution was changed to 5.0 × 10 ⁻⁶ mass%, the drug-containing fiber no. In the same manner as in the preparation of No. 1, drug-containing fiber No. 1 2 was obtained. The obtained drug-containing fiber No. 2, fumaric acid content with respect to 100 parts by mass of cellulose fiber is 0.00010 parts by mass.

Drug-containing fiber No. 3 (0.00015 parts by weight of fumaric acid)
Except that the concentration of fumaric acid in the drug-containing aqueous solution was changed to 7.5 × 10 ⁻⁶ mass%, the drug-containing fiber No. 1 was used. In the same manner as in the preparation of No. 1, drug-containing fiber No. 1 3 was obtained. The obtained drug-containing fiber No. 3, the fumaric acid content with respect to 100 parts by mass of the cellulose fiber is 0.00015 parts by mass.

Drug-containing fiber No. 4 (0.05 parts by mass of fumaric acid)
Except for changing the fumaric acid concentration of the drug-containing aqueous solution to 2.5 × 10 ⁻³ mass%, the drug-containing fiber No. 1 was used. In the same manner as in the preparation of No. 1, drug-containing fiber No. 1 4 was obtained. The obtained drug-containing fiber No. 4 has a fumaric acid content of 0.05 parts by mass with respect to 100 parts by mass of cellulose fibers.

Drug-containing fiber No. 5 (0.15 parts by mass of fumaric acid)
Except that the concentration of fumaric acid in the drug-containing aqueous solution was changed to 7.5 × 10 ⁻³ mass%, the drug-containing fiber no. In the same manner as in the preparation of No. 1, drug-containing fiber No. 1 5 was obtained. The obtained drug-containing fiber No. No. 5, fumaric acid content with respect to 100 parts by mass of cellulose fiber is 0.15 parts by mass.

Drug-containing fiber No. 6 (0.15 parts by mass of citric acid)
Citric acid was dissolved in 20 g of water to prepare an aqueous citric acid solution having a concentration of 7.5 × 10 ⁻³ mass%. This citric acid aqueous solution was sprayed on 100 g of wood pulp (cellulose fiber) and dried with a dryer (set temperature: 50 ° C.) for 24 hours. The obtained drug-containing fiber No. 6, the citric acid content with respect to 100 parts by mass of the cellulose fiber is 0.15 parts by mass.

Drug-containing fiber No. 7 (0.15 parts by mass of lactic acid)
Lactic acid was dissolved in 20 g of water to prepare a lactic acid aqueous solution having a concentration of 7.5 × 10 ⁻³ mass%. This aqueous lactic acid solution was sprayed on 100 g of wood pulp (cellulose fiber) and dried with a dryer (set temperature: 50 ° C.) for 24 hours. The obtained drug-containing fiber No. 7 has a lactic acid content of 0.15 parts by mass with respect to 100 parts by mass of the cellulose fibers.

Reference example 1
50 g of water was sprayed on 100 g of wood pulp (cellulose fibers) and dried for 24 hours with a dryer (set temperature: 50 ° C.) to obtain comparative fibers.

(Odor test 1)
A liquid-permeable nonwoven fabric (length 12 cm, width 12 cm), tissue paper (weighing 15 g / m ² , length 10 cm, width 10 cm), and polyethylene film (length 12 cm, width 12 cm) were prepared. The drug-containing fiber No. 1 to 7 or 2 g of the comparative fiber was weighed and molded into a size of 10 cm in length and 10 cm in width. This molded product was sandwiched between two tissue papers to obtain a laminate. A hot melt adhesive was applied on the polyethylene film, and the laminate was stacked. Further, a hot melt adhesive was applied on the laminate, and the liquid-permeable nonwoven fabric was stacked to obtain a fiber-containing sheet.

After applying 5 ml of human urine to the obtained fiber-containing sheet, it was put in a sealed container. Immediately after putting in the sealed container, the odor intensity was evaluated in the following three stages after 10 minutes, 1 hour and 3 hours. The sealed container was kept at room temperature (20 ° C.) immediately after 10 minutes and kept at 40 ° C. after 10 minutes to 3 hours. The results are shown in Table 1.
<Evaluation criteria for odor intensity>
○: Odorless or odor that can be detected somehow.
(Triangle | delta): It can understand what kind of smell.
X: It smells intensely.

  As shown in Table 1, drug-containing fiber No. 1 having a fumaric acid application amount of 0.00010 parts by mass to 0.15 parts by mass with respect to the base fiber. In Nos. 2 to 5, the odor after 10 minutes is almost odorless, and even after 3 hours, it can be deodorized to such an extent that it is difficult to understand what the smell is. Drug-containing fiber No. 1 having a fumaric acid application amount of 0.000010 parts by mass with respect to the base fiber No. 1 is inferior in deodorizing effect because the amount of fumaric acid is too small. Drug-containing fiber No. 1 using citric acid or lactic acid as the drug. 6 and 7, the evaluation results of odor intensity were almost the same as in the reference example, and almost no deodorizing effect was confirmed.

Drug-containing fiber No. 8 (0.15 parts by mass of fumaric acid)
A fumaric acid dispersion in which 30% by mass of fumaric acid is dispersed in an aqueous xanthan gum solution in water (manufactured by Daiichi Seimsha, fumaric acid dispersion “DF-30”, xanthan gum content relative to 100 parts by mass of fumaric acid is 0.01 (Parts by mass to 5 parts by mass) was dissolved to prepare a drug-containing aqueous solution having a fumaric acid concentration of 0.15% by mass. 0.3 g of the above-mentioned drug-containing aqueous solution was sprayed on 0.3 g of wood pulp (cellulose fiber) and dried with a dryer (set temperature: 50 ° C.) for 24 hours. The obtained drug-containing fiber No. In No. 8, the fumaric acid content with respect to 100 parts by mass of the cellulose fiber is 0.15 parts by mass.

Drug-containing fiber No. 9-11 (citric acid, malic acid, lactic acid 0.15 parts by mass)
Citric acid, malic acid or lactic acid was dissolved in water to prepare a pharmaceutical aqueous solution having a concentration of 0.15% by mass. 0.3 g of this chemical aqueous solution was sprayed on 0.3 g of wood pulp (cellulose fiber) and dried for 24 hours with a dryer (set temperature: 50 ° C.). The obtained drug-containing fiber No. 9-11 are 0.15 mass parts of chemical | medical agent content with respect to 100 mass parts of cellulose fibers.

Drug-containing fiber No. 12-15 (Fumaric acid, citric acid, malic acid, lactic acid 1.5 parts by mass)
Except for changing the spraying amount of the chemical-containing aqueous solution to the wood pulp to 3.0 g, the chemical-containing fiber No. In the same manner as the production of 8-11, the drug-containing fiber No. 12-15 were obtained. The obtained drug-containing fiber No. 12-15 are 1.5 mass parts of chemical | medical agent content with respect to 100 mass parts of cellulose fibers.

(Antimicrobial test)
A glass vial was charged with 0.3 g of drug-containing fiber, and a medium inoculated with E. coli was added to prepare a test sample. Microorganism growth at 37 ° C. was measured using a microcalorimeter. For comparison, tests were also conducted on unprocessed pulp to which no chemical was applied and unprocessed pulp to which no chemical was applied and no bacteria were inoculated. The microcalorimeter captures heat generated when microorganisms grow and measures the growth of microorganisms over time. If the drug has a growth inhibitory effect, the time of appearance of the peak of the growth thermograph is delayed. If the drug has a growth inhibitory effect, no peak appears in the growth thermograph. The results are shown in FIG.

  As shown in FIG. In 12 to 15, the growth inhibitory effect was observed because the growth thermogram was flat. Drug-containing fiber No. From 9 to 11, the growth inhibitory effect was observed because the growth thermogram was delayed from the unprocessed pulp. Also, the drug-containing fiber No. No. 8 showed a higher growth inhibitory effect than the pulp processed with other chemicals.

[Absorber]
4 g of wood pulp (cellulose fiber) and 2 g of water-absorbing resin powder (SDP Global, Sunwet (registered trademark)) were mixed to prepare a water-absorbing material. 6 g of the water-absorbing material was molded into a size of 10 cm in length and 10 cm in width. The molded body was sandwiched between ^two tissue papers (cellulose fiber, basis weight 15 g / m ² , length 10 cm, width 10 cm) to prepare an absorbent core. A hot melt adhesive was applied on a polyethylene film (12 cm long, 12 cm wide), and the absorbent core was overlaid. Furthermore, a hot melt adhesive was applied on the absorbent core, and a liquid-permeable nonwoven fabric (12 cm long and 12 cm wide) was stacked thereon to obtain a comparative absorbent.

Absorber No. 1
A fumaric acid dispersion in which 30% by mass of fumaric acid is dispersed in an aqueous xanthan gum solution in water (manufactured by Daiichi Seimsha, fumaric acid dispersion “DF-30”, xanthan gum content relative to 100 parts by mass of fumaric acid is 0.01 (Parts by mass to 5 parts by mass) was dissolved to prepare a drug-containing aqueous solution having a fumaric acid concentration of 0.15% by mass. 0.6 g of this drug-containing aqueous solution was applied to the comparative absorbent and dried at room temperature (20 ° C.) for 1 week. 1 was obtained.

Absorber No. 2
Except for changing the fumaric acid concentration of the drug-containing aqueous solution to 1.5% by mass, the absorber No. 1 was used. 1 in the same manner as in the preparation of Absorber No. 1. 2 was obtained.

Absorber No. 3
Absorber No. was changed except that the amount of the aqueous solution containing the drug on the comparative absorbent was changed to 6.0 g. In the same manner as in the preparation of 3 was obtained.

Absorber No. 4
Lactic acid was dissolved in water to prepare an aqueous lactic acid solution having a concentration of 1.5% by mass. 6 g of this drug-containing aqueous solution was applied to the comparative absorbent and dried at room temperature (20 ° C.) for 1 week. 4 was obtained.

Absorber No. 5
Absorber No. 1 except that the drug was changed to citric acid. 4 in the same manner as in the production of absorber No. 4. 5 was obtained.

Absorber No. 6
Except for changing the drug to malic acid, Absorber No. 4 in the same manner as in the production of absorber No. 4. 6 was obtained.

Absorber No. 7
A silver ion carrying compound (Zeomic (registered trademark) aqueous dispersion manufactured by Sinanen Zeomic Co., Ltd.) was dissolved in water to prepare an aqueous dispersion of a silver ion carrying compound having a concentration of 1.5% by mass. 0.6 g of this dispersion was applied to the comparative absorbent and dried at room temperature (20 ° C.) for 1 week. 7 was obtained.

Absorber No. 8
Benzalkonium chloride was dissolved in water to prepare an aqueous solution having a concentration of 1.5% by mass. 0.6 g of this drug-containing aqueous solution was applied to the comparative absorbent and dried at room temperature (20 ° C.) for 1 week. 8 was obtained.

(Odor test 2)
The absorbent was made to absorb 40 ml of human urine and stored in a thermostatic bath (40 ° C.), and the odor intensity immediately after absorption, 10 minutes, 1 hour, 3 hours and 6 hours was evaluated according to the following 6 levels. Evaluation was performed by nine testers, and the average value was used as the evaluation. The results are shown in Table 2 and FIG.
0: Odorless.
1: Smell that can be detected somehow.
2: Can understand what kind of odor, but weak odor.
3: Smell that can be easily detected.
4: Strongly smells.
5: Strongly smells.

  As shown in Table 2, Absorber No. to which fumaric acid was added. In Nos. 2 and 3, the increase in odor intensity is small compared to the comparative absorbent to which no drug is applied, and the deodorizing effect can be confirmed. Absorbent No. using lactic acid, citric acid or malic acid as a drug. Nos. 4 to 6 had higher odor intensity than the comparative absorbent, and no deodorizing effect could be confirmed. Absorber No. provided with silver ion and benzalkonium chloride. In 7 and 8, the deodorizing effect was confirmed until 60 minutes later, but the odor intensity increased after 3 hours and the duration of the deodorizing effect was short.

Absorber No. 9 (0.015 parts by mass of fumaric acid)
A fumaric acid dispersion in which 30% by mass of fumaric acid is dispersed in an aqueous xanthan gum solution in water (manufactured by Daiichi Seimsha, fumaric acid dispersion “DF-30”, xanthan gum content relative to 100 parts by mass of fumaric acid is 0.01 (Parts by mass to 5 parts by mass) was dissolved to prepare a drug-containing aqueous solution having a fumaric acid concentration of 0.15% by mass. Water was added to 0.03 g of this drug-containing aqueous solution to adjust the total amount to 1.5 g. All of the diluted solution of the drug-containing aqueous solution is sprayed on 0.3 g of a water-absorbing material containing 60% by weight of wood pulp and 40% by weight of water-absorbent resin powder, and dried for 4 hours with a dryer (set temperature 45 ° C.). It was. The obtained absorbent body No. 9, the drug content with respect to 100 parts by mass of the water-absorbing material is 0.015 parts by mass.

Absorber No. 10 (0.075 parts by mass of fumaric acid)
Except having changed the usage-amount of chemical | medical-agent-containing aqueous solution into 0.15g, the said absorber No. 1 was changed. In the same manner as in the preparation of No. 9, Absorber No. 10 was obtained. The obtained absorbent body No. No. 10 has a drug content of 0.075 parts by mass with respect to 100 parts by mass of the water-absorbing material.

Absorber No. 11 (0.015 parts by mass of silver ions)
A silver ion-carrying compound (manufactured by Sinanen Zeomic Co., Zeomic aqueous dispersion) was dissolved in water to prepare an aqueous dispersion of a silver ion-carrying compound having a concentration of 0.15% by mass. Water was added to 0.03 g of this drug-containing aqueous solution to adjust the total amount to 1.5 g. All of the diluted solution of the drug-containing aqueous solution is sprayed on 0.3 g of a water-absorbing material containing 60% by weight of wood pulp and 40% by weight of water-absorbent resin powder, and dried for 4 hours with a dryer (set temperature 45 ° C.). It was. The obtained absorbent body No. 11 has a silver ion content of 0.015 parts by mass with respect to 100 parts by mass of the water-absorbing material.

Absorber No. 12 (0.075 parts by mass of silver ions)
Except having changed the usage-amount of chemical | medical-agent-containing aqueous solution into 0.15g, the said absorber No. 1 was changed. 11 in the same manner as in the production of the absorber No. 11. 12 was obtained. The obtained absorbent body No. No. 12, the silver ion content with respect to 100 parts by mass of the water-absorbing material is 0.075 parts by mass.

Absorber No. 13 (0.015 parts by mass of benzalkonium chloride)
Benzalkonium chloride was dissolved in water to prepare an aqueous solution having a concentration of 0.15% by mass. Water was added to 0.03 g of this drug-containing aqueous solution to adjust the total amount to 1.5 g. All of the diluted solution of the drug-containing aqueous solution is sprayed on 0.3 g of a water-absorbing material containing 60% by weight of wood pulp and 40% by weight of water-absorbent resin powder, and dried for 4 hours with a dryer (set temperature 45 ° C.). It was. The obtained absorbent body No. In No. 13, the drug content with respect to 100 parts by mass of the water-absorbing material is 0.015 parts by mass.

Absorber No. 14 (0.075 parts by mass of benzalkonium chloride)
Except having changed the usage-amount of chemical | medical-agent-containing aqueous solution into 0.15g, the said absorber No. 1 was changed. 13 in the same manner as in the preparation of Absorber No. 13. 14 was obtained. The obtained absorbent body No. No. 14, the drug content with respect to 100 parts by mass of the water-absorbing material is 0.075 parts by mass.

(Antimicrobial test)
A glass vial was charged with 0.3 g of a water-absorbing material provided with a drug, and a medium inoculated with E. coli was added to prepare a test sample. Microorganism growth at 37 ° C. was measured using a microcalorimeter. The results are shown in FIG. For comparison, tests were also conducted on unprocessed pulp to which no chemical was applied and unprocessed pulp to which no chemical was applied and no bacteria were inoculated.

  As shown in FIG. As for 9-14, the appearance of the peak was late | slow rather than unprocessed pulp, and the growth inhibitory effect was observed. Among these, the absorber No. No. 11 has a low growth inhibitory effect because a peak appears relatively early. Conventionally, silver ions and benzalkonium chloride have a reduced antibacterial effect over time, but in this test, they maintained the same antibacterial effect as fumaric acid. In this antibacterial test, the mass of the medium added to the absorber is small, so silver ions may come into contact with residual chlorine in the pulp, or benzalkonium chloride may come into contact with sodium in the water absorbent resin powder. It is thought that there was not.

The fumaric acid-containing fiber and fumaric acid-containing fiber assembly of the present invention are sanitary articles such as disposable diapers, sanitary napkins, incontinence pads, and masks; medical articles such as surgical drapes, surgical gowns, pressing belts for hemostasis, and white coats; Clothing such as clothes, side pads, stockings, gloves, caps, and apron; daily necessities such as towels, wipers, cooking sheets, drip sheets, wet tissues, bedding, furoshiki, tote bags, slippers, filters; industrial materials such as nets Can be suitably used.

Claims (8)

Having a base fiber and fumaric acid,
The base fiber contains only water-absorbing fibers,
The fumaric acid is given by removing water after contacting the base fiber and the fumaric acid-containing aqueous solution,
The water-absorbing fiber has an absorption amount of 0.2 g or more of physiological saline per 1 g of fiber,
The fumaric acid-containing fiber is characterized in that the application amount of fumaric acid is 0.0001 to 0.15 parts by mass with respect to 100 parts by mass of the water-absorbing fiber.   The fumaric acid-containing fiber according to claim 1, wherein the water-absorbing fiber is a cellulose fiber.   The fumaric acid-containing fiber according to claim 1 or 2, wherein the water-absorbing fiber is a natural cellulose fiber and / or a regenerated cellulose fiber. The fumaric acid-containing fiber according to any one of claims 1 to 3, wherein the water-absorbing fiber is pulp . The fumaric acid-containing fiber according to any one of claims 1 to 4, wherein the fumaric acid-containing aqueous solution contains xanthan gum, pectin, guar gum, tamarind gum, carrageenan, or gelatin as a thickener. A fumaric acid-containing fiber assembly comprising the fumaric acid-containing fiber according to any one of claims 1 to 5 . The fumaric acid-containing fiber assembly according to claim 6 , which is a nonwoven fabric, a woven fabric, or a knitted fabric. An absorbent comprising the fumaric acid-containing fiber according to any one of claims 1 to 5 and a water-absorbent resin powder as the water-absorbing material.