JP6118440B1 - Sanitary absorbent articles - Google Patents

Abstract

A hygiene absorbent article having the ability to effectively and continuously decompose and remove a wide variety of odor-causing substances.
A hygiene absorbent article selected from diapers, incontinence guards, sanitary napkins, panty liners, and the like, wherein the hygiene absorbent article comprises a liquid permeable cover layer, a liquid impermeable cover layer, and An absorbent structure enclosed between the two cover layers, wherein the liquid-permeable cover layer and / or the absorbent structure is made of a metal composition containing iron, aluminum, potassium, and titanium, and the metal composition A fiber in which an air catalyst having a metal content ratio of 100 to 500 ppm of aluminum, 0.5 to 50 ppm of potassium, and 0.1 to 50 ppm of titanium with respect to 100 ppm of iron is attached to the fiber surface, and a crosslinked acrylate-based moisture absorbing / releasing fiber The material decomposition removal fiber which consists of is included.
[Selection figure] None

Description

  The present invention relates to a hygiene absorbent article that dramatically improves the ability to decompose and remove odor-causing substances by using a fiber having an air catalyst attached thereto and a crosslinked acrylate-based moisture-absorbing / releasing fiber.

  With the recent increase in comfort and health awareness, there is a strong demand for the development of materials that have the function of decomposing or removing pollutants. Based on these functions, degrading and antibacterial substance decomposition and removal agents Many have been proposed.

  Patent Document 1 proposes a photocatalyst-containing fiber that is formed from a polymer having a crosslinked structure and a carboxyl group and contains metal oxide fine particles having photocatalytic activity. Such metal oxide fine particles have a function of adsorbing malodorous substances, allergens, fungi, viruses, etc. to carboxyl groups and decomposing with photocatalysts, but sufficient light irradiation is necessary to exert their functions. In addition, there is a problem that a substance that cannot be decomposed and removed only by adsorption with a carboxyl group exists.

  Patent Document 2 proposes a fiber structure in which an air catalyst that generates hydroxyl radicals, ozone, or peroxide without light irradiation is fixed. Air catalysts are excellent in decomposing and removing substances, but in order to perform their functions effectively, a sufficient amount of water vapor needs to be continuously present in the surroundings. There was a problem that there was a substance that was insufficiently removed.

  Patent Document 3 proposes a deodorant, an antibacterial agent, or an antifungal agent comprising a metal composition containing iron, aluminum and potassium, and an aqueous composition containing water. Since this water-based composition evaporates moisture when it adheres to an object, there is a limit to the continuous performance of the function, and there is a problem that there is a substance that is insufficiently decomposed and removed only by an air catalyst. .

  In order to solve the above-mentioned problems of Patent Documents 1 to 3, the applicant has proposed a substance decomposition / removal agent having the ability to effectively and continuously decompose and remove a wide variety of substances (see Patent Document 4). However, Patent Document 4 has not proposed a method for specifically realizing the function of these substance decomposition and removal agents in a hygiene absorbent article.

JP 2014-74243 A Japanese Patent Laying-Open No. 2005-60904 Japanese Patent Laid-Open No. 2007-215988 PCT / JP2015 / 079581

  The present invention was devised in order to further advance the technique of Patent Document 4 described above, and its purpose is to provide a hygiene absorbent article having the ability to effectively and continuously decompose and remove a wide variety of odor-causing substances. It is to provide.

  As a result of intensive studies to achieve the above-mentioned object, the present inventor has found that air in a sanitary absorbent article is combined with a crosslinked acrylate-based moisture-absorbing / desorbing fiber by using a fiber having an air catalyst attached thereto and a crosslinked acrylate-based moisture-absorbing / releasing fiber. The water vapor concentration around the catalyst is continuously increased, so that a large amount of OH radicals are generated from the air catalyst to maximize the substance decomposition and removal ability of the air catalyst, and this also has a cross-linked acrylate moisture absorption / release property. It has been found that the ability to decompose and remove a wide variety of odor-causing substances is synergistically increased with the addition of the substance adsorption ability of the fiber, and the present invention has been completed.

That is, the present invention has the following configurations (1) to (4).
(1) A sanitary absorbent article selected from diapers, incontinence guards, sanitary napkins, panty liners, and similar articles, wherein the sanitary absorbent article comprises a liquid-permeable cover layer, a liquid-impermeable cover layer, and the aforementioned An absorbent structure surrounded between both cover layers, wherein the liquid permeable cover layer and / or the absorbent structure is made of a metal composition containing iron, aluminum, potassium, and titanium, and the metal composition From a fiber in which an air catalyst having a metal content ratio of 100 to 500 ppm of aluminum, 0.5 to 50 ppm of potassium, and 0.1 to 50 ppm of titanium with respect to 100 ppm of iron is attached to the fiber surface, and a crosslinked acrylate-based moisture absorbing / releasing fiber A sanitary absorbent article comprising a material-decomposing and removing fiber.
(2) The sanitary absorbent article according to (1), wherein the sanitary absorbent article contains 0.1% by mass or more of the material decomposition removal fiber.
(3) The content of the metal composition in the material decomposition-removed fiber is 0.01% by mass or more, and the content of the crosslinked acrylate-based moisture absorbing / releasing fiber is 50% by mass or more (1) Or the hygiene absorbent article as described in (2).
(4) The sanitary absorbent article according to any one of (1) to (3), wherein the fiber having an air catalyst attached to the fiber surface is a polyester fiber and / or an acrylic fiber.

  Since the hygroscopic absorbent article of the present invention continuously increases the water vapor concentration around the air catalyst due to the presence of the cross-linked acrylate-based moisture-absorbing / releasing fibers, the organic catalyst and inorganic substances (excluding metals) are decomposed by the air catalyst. The ability to fully exhibit removal ability and the effect of adsorption of substances by cross-linked acrylate-based moisture-absorbing and releasing fibers also exist, so the ability to decompose and remove a wide variety of organic and inorganic substances (excluding metals) is extremely good. ing. Therefore, the sanitary absorbent article of the present invention can effectively decompose and remove odor-causing substances derived from human or animal body fluids.

  The sanitary absorbent article of the present invention is selected from diapers, incontinence guards, sanitary napkins, panty liners, and the like, and a fiber having an air catalyst made of a specific metal composition attached to the fiber surface; It is characterized by comprising a material-decomposing and removing fiber composed of a crosslinked acrylate-based moisture-absorbing and releasing fiber. With these characteristics, the synergistic effect of air catalyst and cross-linked acrylate-based moisture-absorbing / desorbing fiber dramatically increases the ability to decompose and remove substances, and continuously has high deodorant, antibacterial, antiviral, and antifungal properties. It is something that is demonstrated at the level.

  The air catalyst attached to the fiber in the material decomposition removal fiber of the present invention generates a hydroperoxyl radical and a superoxide ion by reacting with moisture in the air by a catalytic effect without using chemicals, and is a harmful substance. It exhibits excellent effects such as antibacterial and deodorizing.

  The air catalyst is composed of a metal composition containing iron, aluminum, potassium, and titanium. For example, iron, aluminum, and potassium extracted from soil with inorganic acid or sulfuric acid are converted from titanium tetrahydroxide hydrochloride. It can be manufactured by blending titanium. The air catalyst itself, including its mechanism of action, has been widely known so far, and can be obtained from commercial products.

  Potassium in the air catalyst is an energy source for the air catalyst to have an effect of decomposing and removing substances. Electron beams emitted from potassium collide with surrounding water molecules, and hydrated electrons, atomic hydrogen, hydrogen gas, hydroxyl radicals, and hydrogen peroxide are generated. Hydrated electrons and atomic hydrogen are oxidized to produce hydroperoxyl radicals and superoxide ions, which together with atomic hydrogen produce hydrogen peroxide. Hydrogen peroxide is reduced by iron to generate hydroxy radicals and hydroxide ions (Fenton reaction). Hydrogen peroxide is oxidized by iron to produce hydroperoxyl radicals and hydrogen ions. Hydroxy radicals and superoxide ions have a strong oxidizing power, thereby decomposing / removing substances and inhibiting the growth of microorganisms.

  As described above, iron promotes the formation reaction of hydroxy radicals and hydroxide ions (Fenton reaction) and the formation reaction of hydroperoxyl radicals and hydrogen ions. Aluminum functions as a binding material for fixing and fixing to an object or a carrier. Titanium has a role of further enhancing the substance decomposition / removal effect by aluminum, iron, and potassium. The contents of aluminum, potassium, and titanium are preferably 100 to 500 ppm, 0.5 to 50 ppm, and 0.1 to 50 ppm, respectively, with respect to 100 ppm of iron. More preferably, the ratio is 100 to 300 ppm, 1 to 10 ppm, and 0.1 to 5 ppm, respectively, with respect to 100 ppm of iron. Further, the iron content in the metal composition is preferably 10 to 100 ppm, the aluminum content is 10 to 100 ppm, the potassium content is 0.1 to 10 ppm, and the titanium content is preferably 0.01 to 1 ppm.

  The fiber on which the air catalyst is attached to the surface preferably has a fiber length of 30 to 70 mm and a single yarn fineness of 0.4 to 2.0 dtex. Moreover, although it does not specifically limit as this fiber, It is preferable to use a polyester fiber and / or an acrylic fiber. As a method for attaching the air catalyst to the fiber, a conventionally known method can be appropriately employed. For example, the air catalyst component is sprayed on the surface of the fiber and dried, or the air catalyst component is dissolved. The method of immersing the fiber in the prepared solution and drying it may be mentioned.

  As the crosslinked acrylate-based moisture-absorbing / releasing fiber used in the material-decomposing and removing fiber of the present invention, a conventionally known fiber having a crosslinked structure and an acrylate-based polymer having a carboxyl group of 0.1 to 10 mmol / g can be used. It is. As such a fiber, for example, as described in JP-A No. 2000-314082, an increase in nitrogen content introduced by a crosslinking treatment with a hydrazine compound on an acrylic fiber having an acrylonitrile content of 85 to 95% by weight 1.0 to 5.0% by weight of a crosslinked acrylate fiber, wherein a part of the residual nitrile group is converted to an alkali metal salt type carboxyl group of 3.0 to 6.0 meq / g, and Examples of the moisture absorbing / releasing fibers include a moisture absorption difference of 50% by weight to 150% by weight between the 20 ° C. × 50% RH condition and the 20 ° C. × 95% RH condition. Cross-linked acrylate fibers include H-type carboxyl group-type fibers that have not been converted into salt type other than those converted into salt-type carboxyl groups such as Na salt, Mg salt, and Ca salt as described above. Either type can be used. The cross-linked acrylate fiber preferably has a fiber length of 30 to 60 mm and a single yarn fineness of 1.5 to 11.0 dtex.

  The material decomposition removal fiber of the present invention uses a blender or the like in a mass ratio of 5:95 to 50:50 of the above-described air catalyst adhered to the fiber surface and the crosslinked acrylate-based moisture-absorbing / releasing fiber. It is preferable to use the mixture uniformly. The sanitary absorbent article of the present invention preferably contains the above-mentioned material decomposition removal fiber in an amount of 0.1% by mass or more, 0.5% by mass or more, and 1.0% by mass or more. The upper limit of the content is not particularly limited, but is about 20% by weight from the viewpoint of maintaining the function of the sanitary absorbent article.

  The content of the metal composition of the air catalyst in the material decomposition removal fiber of the present invention is preferably 0.01% by mass or more, more preferably 0.03% by mass or more, further preferably 0.05% by mass or more, Although an upper limit is not specifically limited, From an economical viewpoint, it is 20 mass%. In addition, the content of the crosslinked acrylate-based moisture-absorbing / releasing fiber in the material-decomposing and removing fiber of the present invention is 50% by mass or more, preferably 60% by mass or more, and the upper limit is not particularly limited. %.

  It is preferable that the material decomposition removal fiber of the present invention is used by mixing with the heat-bonding fiber when it is contained in the hygiene absorbent article. By heating the material decomposition removal fiber of the present invention together with the thermal bonding fiber, the material decomposition removal fiber can be uniformly dispersed and fixed in the hygiene absorbent article. Moreover, it can also contribute to the form retainability of the hygiene absorbent article. As the heat-bonding fiber, a conventionally known fiber may be used. For example, a fiber having a core-sheath structure including a low melting point component in the sheath part is preferable. Specifically, a core-sheath fiber using a polyethylene terephthalate having a high melting point as the core component and a polyethylene having a low melting point as the sheath component can be used.

  The sanitary absorbent article of the present invention includes a liquid-permeable cover layer, a liquid-impermeable cover layer, and an absorbent structure surrounded between the two cover layers, in the same manner as conventionally known articles. Here, the liquid is intended for human and animal body fluids such as urine, blood, and feces. The liquid permeable cover layer is a layer that first receives the released body fluid into the absorbent article, and conventionally known liquid permeable materials such as spunbond nonwoven materials are used. For the liquid-impermeable cover layer, a conventionally known liquid-impermeable material such as a polyethylene film is used. The absorbent structure is disposed between the liquid-permeable cover layer and the liquid-impermeable cover layer described above, and after acquiring the body fluid, it is distributed and stored throughout the structure. Conventionally known materials such as superabsorbent materials, natural materials (such as cellulose fibers), and synthetic fibers that can absorb double weight of liquid are used.

  The sanitary absorbent article of the present invention is characterized in that the above-mentioned material decomposition removal fiber is contained in the above-mentioned liquid-permeable cover layer and / or absorbent structure. By containing the above-mentioned material decomposition removal fiber in the above-mentioned part of the sanitary absorbent article, it is possible to effectively reduce odors derived from human and animal body fluids. As a method for incorporating the material decomposition removal fiber into the sanitary absorbent article according to the present invention, bonding by mechanical needling, air-through bonding, bonding by water injection, or the like can be employed.

  The hygiene absorbent article of the present invention can be developed for various uses, but due to its material decomposition removal performance, it is particularly advantageously used in diapers, incontinence guards, sanitary napkins, or panty liners from which humans or animals release body fluids. Can be done.

  The sanitary absorbent article of the present invention can continuously decompose and remove a wide range of organic and inorganic substances (excluding metals) such as ammonia, hydrogen sulfide, indole, nitric oxide and nitrogen dioxide. It also has an antibacterial function that suppresses the growth of bacteria, viruses, and molds.

  The effects of the sanitary absorbent article of the present invention will be shown below by examples, but the present invention is not limited thereto.

Example 1
(1) Preparation of Fiber A with Air Catalyst Adhered to Fiber Surface A commercially available “TiOTiO” (manufactured by Sunward Shokai Co., Ltd.) was prepared as an air catalyst. When the metal composition of this “TiOTiO” was analyzed, it was iron 17 ppm, aluminum 24 ppm, potassium 0.22 ppm, titanium 0.08 ppm, and the content ratio of aluminum 141 ppm, potassium 1.29 ppm, titanium 0.47 ppm with respect to iron 100 ppm. Met. The opened polyester fiber having a fiber length of 38 mm and a single yarn fineness of 1.45 dtex was placed on a belt conveyor and applied by spraying so that the amount of air catalyst adhered was 2.0% by mass. The applied polyester was dried at 120 ° C. for 3 minutes to obtain fiber A having an air catalyst attached to the fiber surface.

(2) Preparation of crosslinked acrylate-based moisture-absorbing / releasing fiber B “Cellfine” (manufactured by Toyobo Co., Ltd.) was used as the crosslinked acrylate-based moisture-releasing / releasing fiber B. The fiber B had a fiber length of 37 mm and a single yarn fineness of 2.0 dtex.

(3) Preparation of thermal bonding fiber C As the thermal bonding fiber C, a core-sheath fiber using polyethylene terephthalate as the core component and polyethylene as the sheath component was used. The fiber C had a fiber length of 44 mm and a single yarn fineness of 2.2 dtex.

(3) Preparation of components for sanitary napkins Prepare a spunbond nonwoven web as the liquid-permeable cover layer, prepare a polyethylene film as the liquid-impermeable cover layer, and mix the superabsorbent material particles as the absorbent structure The prepared cellulose fluff pulp was prepared.

(4) Preparation of sanitary napkin After fiber A and fiber B were uniformly mixed using a blender of Ikegami Machinery Co., Ltd. at a mass ratio of 1: 1 to obtain a material-removed and removed fiber, this material was further decomposed and removed. A fiber assembly in which the fibers A, B, and C were in a mass ratio of 1: 1: 8, respectively, was similarly obtained using a cotton blender. This fiber assembly was uniformly dispersed and entangled and fixed to a spunbond nonwoven web constituting the liquid-permeable cover layer by an air-through bonding method at 150 ° C. to obtain a liquid-permeable cover layer. Using the liquid-permeable cover layer thus obtained and the above-described liquid-impermeable cover layer and absorbent structure, 150 mm in length and 50 mm in width so that an absorbent structure exists between both cover layers. A sanitary napkin in the form of a rectangular sheet having a thickness of 3.0 mm and a weight of 39 g was prepared. In addition, the ratio of the material decomposition removal fiber in a sanitary napkin was 1 mass%.

Example 2
As an air catalyst, it was carried out except that it was not a commercial product, but an air catalyst composed of a metal composition derived from soil prepared according to the method described in Production Example 1 (metal composition production) of JP-A-2007-215988 was used. A sanitary napkin was prepared in the same manner as in Example 1. In addition, when it analyzed similarly about the kind and content of the metal element in the metal composition of an air catalyst here, iron, aluminum, potassium, and titanium are 23 ppm, 33 ppm, 0.81 ppm, and 0.07 ppm, respectively. The content was 143 ppm of aluminum, 3.52 ppm of potassium, and 0.30 ppm of titanium with respect to 100 ppm of iron.

Example 3
A sanitary napkin was prepared in the same manner as in Example 1 except that “BEL OASIS” (manufactured by Teijin Limited) was used as the crosslinked acrylate-based moisture-absorbing / releasing fiber B. The fiber length of this fiber B was 51 mm, and the single yarn fineness was 9.9 dtex.

Examples 4 and 5
A sanitary napkin was prepared in the same manner as in Example 1 except that the composition ratios of fiber A and fiber B shown in Table 1 were changed.

Example 6
Example 1 except that an absorbent structure was obtained by entanglement of the above-described fiber assembly using a 150 ° C. air-through bonding method with cellulose fluff pulp mixed with superabsorbent particles constituting the absorbent structure. Similarly, a sanitary napkin in the form of a rectangular sheet having a length of 150 mm, a width of 50 mm, a thickness of 3.0 mm, and a weight of 40 g was prepared. In addition, the ratio of the material decomposition removal fiber in a sanitary napkin was 2 mass%.

Comparative Example 1
A sanitary napkin was prepared in the same manner as in Example 1 except that all the components of the fiber A with the air catalyst attached to the fiber surface were changed to the crosslinked acrylate-based moisture-absorbing / releasing fiber B.

Comparative Example 2
A sanitary napkin was prepared in the same manner as in Example 1 except that all the components of the crosslinked acrylate-based moisture-absorbing / releasing fiber B were changed to the fiber A with an air catalyst attached to the fiber surface.

  The sanitary napkins of Examples 1 to 6 and Comparative Examples 1 and 2 obtained as described above were cut from the center to prepare a 75 mm × 50 mm sample. In order to confirm the effect of decomposition and removal over time with respect to the odor components of ammonia and hydrogen sulfide using this sample, in accordance with the deodorization test of the SEK mark textile product certification standard (JEC301) (Fiber Evaluation Technology Council) The decrease rate of odor components after 2 hours was measured.

  Specifically, each sample was prepared, and these samples were conditioned at 20 ° C. × 65% RH for 24 hours, and then sealed in a 5-liter sampling bag. 3 liters of 20 ° C. × 65% RH air and a predetermined substance (ammonia, hydrogen sulfide) having a predetermined initial concentration are added to a tedra bag containing the sample, and the conditions are 20 ° C. × 65% RH. The concentration (mass%) of the additive substance after 2 hours was measured with a detector tube, and the odor reduction rate (%) was calculated. The results are shown in Table 1.

  As can be seen from the results in Table 1, each of the sanitary napkins of Examples 1 to 6 including the material-decomposing and removing fiber in which the air catalyst and the crosslinked acrylate-based moisture-absorbing and absorbing fiber are used in combination is highly deodorant with respect to ammonia and hydrogen sulfide. The effect (substance decomposition / removal effect) was shown. In contrast, the sanitary napkin of Comparative Example 1 using only the crosslinked acrylate-based moisture absorbing / releasing fiber and Comparative Example 2 using only the air catalyst has a deodorizing effect (substance decomposition / removal that is clearly inferior to Examples 1-6). Effect).

  Since the sanitary absorbent article of the present invention has the ability to continuously decompose and remove a wide variety of substances, diapers, incontinence guards, sanitary napkins, panty liners, and the like from which human and animal body fluids are released It is extremely useful as a similar article.

Claims (4)

  A hygiene absorbent article selected from diapers, incontinence guards, sanitary napkins, panty liners, and similar articles, wherein the hygiene absorbent article comprises a liquid permeable cover layer, a liquid impermeable cover layer, and both the cover layers The liquid permeable cover layer and / or the absorbent structure is made of a metal composition containing iron, aluminum, potassium, and titanium, and the metal in the metal composition Material decomposition comprising a fiber in which an air catalyst having a content ratio of 100 to 500 ppm of aluminum, 0.5 to 50 ppm of potassium, and 0.1 to 50 ppm of titanium with respect to 100 ppm of iron, and a crosslinked acrylate-based moisture absorbing / releasing fiber A hygiene absorbent article comprising removed fibers.   The sanitary absorbent article according to claim 1, wherein the sanitary absorbent article contains 0.1% by mass or more of the material decomposition removal fiber.   The content of the metal composition in the material-decomposed and removed fiber is 0.01% by mass or more, and the content of the crosslinked acrylate-based moisture absorbing / releasing fiber is 50% by mass or more. The sanitary absorbent article as described.   The sanitary absorbent article according to any one of claims 1 to 3, wherein the fiber having the air catalyst attached to the fiber surface is a polyester fiber and / or an acrylic fiber.