WO2008065748A1 - Feuille perméable à l'air et résistante à l'eau et article absorbant utilisant celle-ci - Google Patents

Feuille perméable à l'air et résistante à l'eau et article absorbant utilisant celle-ci Download PDF

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Publication number
WO2008065748A1
WO2008065748A1 PCT/JP2007/001300 JP2007001300W WO2008065748A1 WO 2008065748 A1 WO2008065748 A1 WO 2008065748A1 JP 2007001300 W JP2007001300 W JP 2007001300W WO 2008065748 A1 WO2008065748 A1 WO 2008065748A1
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WO
WIPO (PCT)
Prior art keywords
water
resistant sheet
breathable
sheet
nonwoven fabric
Prior art date
Application number
PCT/JP2007/001300
Other languages
English (en)
Japanese (ja)
Inventor
Shunichiro Umehara
Katsuhiro Okugawa
Migaku Suzuki
Original Assignee
Tomoegawa Co., Ltd.
Japan Absorbent Technology Institute
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tomoegawa Co., Ltd., Japan Absorbent Technology Institute filed Critical Tomoegawa Co., Ltd.
Publication of WO2008065748A1 publication Critical patent/WO2008065748A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51456—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties
    • A61F13/51458—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its properties being air-pervious or breathable
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
    • A61F13/51478—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/84—Accessories, not otherwise provided for, for absorbent pads
    • A61F13/8405—Additives, e.g. for odour, disinfectant or pH control
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F2013/51002—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers with special fibres
    • A61F2013/51019—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers with special fibres being cellulosic material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F2013/51002—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers with special fibres
    • A61F2013/51023—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers with special fibres being polymeric fibres
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51441—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material
    • A61F2013/51452—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material being nonwovens
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • A61F13/51401—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material
    • A61F2013/51441—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material
    • A61F2013/51454—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by the material being a fibrous material being papers

Definitions

  • the present invention relates to a breathable water-resistant sheet obtained by laminating a water repellent material and a deodorant on a composite sheet material composed mainly of fine fibrous cellulose and nonwoven fabric mainly used for hygiene or medical products. is there.
  • the present invention also relates to an absorbent article using this breathable water-resistant sheet.
  • a sheet-like or film-like material used for hygiene or medical products does not leak liquid, but requires a certain degree of air permeability. Although it is difficult for a plastic film to penetrate a liquid, it is not breathable due to its dense structure. In other words, as a sheet material for diapers that require water resistance and breathability (non-contact side with the human body), etc.
  • a hydrophobic film such as polyethylene with a filler such as carbonic acid and a dissimilar polymer
  • a microporous film by means such as forming a phase separation layer is used, but the air permeability (JISP 8 1 1 7) is about 100 to 500 seconds / 10 Om L, and practically sufficient ventilation performance
  • the current situation is that it cannot be said that it is effective.
  • Nonwoven fabrics and paper are breathable, but liquid leakage cannot be completely prevented.
  • a sheet material that solves the drawbacks of these sheet materials, a sheet material composed of microfibrous cellulose (non-woven cellulose) and non-woven fabric has been proposed (for example, patents) Reference 1).
  • the fine fibrous cellulose used there is an extremely thin fibrous cellulose having an average fiber length of 0.3 mm or less and a water retention of 15 mL / g or more.
  • What is known as bacterial cellulose which is obtained by microfabrication by target treatment, and what bacteria are known to be known.
  • Mechanical treatment methods include high pressure homogenizers, grinders, refiners, etc. Can be mentioned.
  • the sheet material is produced by applying a dispersion obtained by dispersing the fine fibrous cellulose in a solvent onto a nonwoven fabric to form a thin layer, and removing the solvent from the thin layer.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 10-2 4 8 8 7 2
  • the object of the present invention is to improve the liquid leakage prevention property of a composite sheet material composed of fine fibrous cellulose and a nonwoven fabric and to provide a deodorizing function, so that it can be used for sanitary materials such as diapers and medical materials. It is to provide sheet material.
  • a water-repellent material containing at least one selected from olefin-based water repellents and paraffin-based water repellents and a synthetic resin-based binder is effective, and by adding a crosslinking agent, in particular, a zirconium-based crosslinking agent,
  • the present inventors have found that long-term water leakage is remarkably improved and have arrived at the present invention.
  • the odor can be reduced by adding a deodorant to the water repellent material to solve the problem of generating odor during use or disposal. is there.
  • the breathable water-resistant sheet of the present invention is a breathable water-resistant sheet obtained by laminating a water-repellent material and a deodorant on a composite sheet material composed of a nonwoven fabric and fine fibrous cellulose.
  • the water repellent material is (a) an olefin-based water repellent and a paraffin-based water repellent.
  • a synthetic resin-based binder and (c) a crosslinking agent.
  • the nonwoven fabric is preferably a span melt nonwoven fabric, and the fine fibrous cellulose has an average fiber length of 0.3 mm or less and a water retention of 15 mL / g or more. It is preferable to have it.
  • the synthetic resin binder is preferably a styrene butane resin, and the crosslinking agent is preferably made of zirconium carbonate.
  • the deodorizing agent is made of natural zeolite.
  • the breathable water-resistant sheet of the present invention is densified by a force-rendering process.
  • the absorbent article according to the present invention is characterized in that the breathable water-resistant sheet is used in a backsheet portion of the absorbent article.
  • a composite sheet composed of a nonwoven fabric and fine fibrous cellulose is formed by a film-forming effect of a synthetic resin binder containing at least one selected from an olefin-based water repellent and a paraffin-based water repellent.
  • the long-term water leakage resistance could be further improved by adding a zirconium carbonate-based crosslinking agent.
  • the odor could be reduced more than the conventional product by adding a deodorant to the water repellent material.
  • the air permeability of the breathable polyethylene film used in the backs of commercially available diapers is 10 00 to 500 seconds / 10 O m L, whereas the deodorizing function of the present invention is provided.
  • the air permeability of the breathable water-resistant sheet is less than several tens of seconds OO ml, and when the sheet of the present invention is used for the back sheet of a diaper, the breathability is remarkably improved to suppress the occurrence of stuffiness and fog. Is possible.
  • FIG. 1 is a schematic cross-sectional view of an example of a breathable water-resistant sheet of the present invention.
  • FIG. 2 is a schematic cross-sectional view of an example of a breathable water-resistant sheet of the present invention.
  • FIG. 3 is a flowchart of the method for producing a breathable water-resistant sheet of the present invention.
  • FIG. 4 is a schematic view of a production apparatus used in the production process of the breathable water-resistant sheet of the present invention.
  • FIG. 5 is a plan view of a disposable paper diaper that is an example of the absorbent article of the present invention.
  • FIG. 6 is a cross-sectional view taken along line A_B in FIG.
  • FIG. 7 is a schematic diagram of a device for confirming deodorization performance with ammonia.
  • FIG. 8 is a schematic diagram of a device for confirming deodorization performance with ammonia. Explanation of symbols
  • the breathable water-resistant sheet of the present invention has a water repellent and deodorant mixture 2 laminated on a composite sheet material 1 made of a nonwoven fabric and fine fibrous cellulose, for example, as shown in FIG. Sheet. Further, as shown in FIG. 2, the breathable water-resistant sheet of the present invention has a mixture 2 of a water repellent material and a deodorant laminated on both surfaces of a composite sheet material 1 made of a nonwoven fabric and fine fibrous cellulose. Good.
  • the water repellent material and the deodorant constituting the breathable water-resistant sheet of the present invention include a layer containing a water repellent material, in addition to laminating both as a mixture as shown in FIG. 1 and FIG. It is also possible to divide and laminate the composite sheet material into two layers containing a deodorant, and such an embodiment is also included in the present invention. In this case, the stacking order of the water repellent material-containing layer and the deodorant-containing layer is not limited.
  • Nonwoven fabrics used in the present invention include natural fibers such as wool and cotton, Nonwoven fabrics made of various materials such as chemical fibers such as Nya acetate, synthetic fibers, and inorganic fibers such as glass fibers and carbon fibers can be mentioned.
  • a nonwoven fabric made of synthetic fibers such as polyethylene, polypropylene, polyester, polyester / polyethylene composite fiber, and polyester low-melting polyester composite fiber is preferable.
  • non-woven fabric made of spun ponds (hereinafter referred to as “S”) obtained from polypropylene fibers which are hydrophobic and relatively inexpensive is preferably melt blown nonwoven fabric (hereinafter referred to as “M”) obtained from polypropylene fibers. .
  • spun-melt nonwoven fabrics in which the above S and M are combined are preferable, and SMS or SMMS is particularly suitable for the purpose of the present invention because it has a low basis weight and is dense.
  • SMS or SMMS is particularly suitable for the purpose of the present invention because it has a low basis weight and is dense.
  • the above S and M have different fiber diameters and properties due to different manufacturing methods. For example, melt blown nonwoven fabric
  • SMS is made of ultrafine fibers of about 0.5 to 5 microns, and the bacteria can remove small dust in the air, but the strength is weak, so it is covered with other strong nonwoven fabrics. It needs to be reinforced.
  • SMS is a three-layer structure sandwiched between a weak melt-protruded non-woven fabric (M) and a non-woven fabric made of spun pond (S), which has a fineness of 10 to 50 microns.
  • SMMSS is a non-woven fabric having a four-layer structure in which a melt blow layer is provided in the intermediate layer in order to make the sheet more dense.
  • the fine fibrous cellulose used in the present invention is obtained by mechanically making a pulp or cotton fiber slurry into fine fibers, or what is called bacterial cellulose produced by bacteria (acetic acid bacteria), etc. Can be mentioned.
  • the fine fibrous cellulose is preferably an extremely fine fibrous cell mouth having an average fiber length of 0.3 mm or less and a water retention of 15 mL / g or more.
  • the average fiber length of fine fibrous cellulose exceeds 0.3 mm or when the water retention is less than 15 ml / g, the penetration into the non-woven fabric is difficult and the anchoring effect is lost. There is a possibility that problems such as poor adhesion of the nonwoven fabric and difficulty in forming a uniform texture in the fine fibrous cellulose layer may occur.
  • the water retention was measured by the following method. Weigh 50 mL of an aqueous dispersion of fine fibrous cellulose (0.5 g) into a centrifuge tube (inner diameter 30 mm x length 10 Omm, volume 5 Om L), and measure this into 2000 X g (3300 rpm) for 10 minutes, the sedimentation volume (mL) was read, and the water retention was calculated according to the following formula.
  • the basis weight of the nonwoven fabric used in the present invention is preferably 10 to 50 g / m 2, more preferably 1 2.0 to 20 g / m 2 .
  • the basis weight of the fine fibrous cellulose is preferably from 2.0 to 20 g / m 2 , more preferably from 4.0 to 10 Og / m 2 .
  • the basis weight is less than 2.0 g / m 2 , it is not preferable because when used in absorbent articles such as diapers, water resistance is lowered and urine is likely to leak.
  • the basis weight is more than 20.0 g / m 2 , it is not preferable because the air permeability is lowered and the cost is increased.
  • a method for producing a composite sheet material constituting the present invention first, fine fibrous cellulose is dispersed in water, or in a mixed solvent composed of water and an organic solvent compatible with water. The dispersed dispersion is applied onto the nonwoven fabric to form a composite sheet material. When organic solvents are mixed, methanol, ethanol, etc. are used.
  • the composite sheet material thus produced has a three-layer structure.
  • the three-layer structure means a layer made of nonwoven fabric / nonwoven fabric and a layer made of fine fibrous cellulose / layer made of fine fibrous cellulose.
  • a deodorizing agent may be dispersed together with the fine fibrous cellulose in the above solvent, and coated on the nonwoven fabric to form a composite sheet material.
  • concentration of the dispersion during coating is preferably in the range of 0.5 to 2.0% by weight.
  • the nonwoven fabric used as the base material can contain water or a mixed solvent containing water and can be deaerated to produce a uniform sheet. . Thereafter, the solvent contained in the sheet can be removed from the sheet and dried.
  • the water repellent material constituting the present invention includes (a) at least one selected from an olefin-based water repellent and a paraffin-based water repellent, (b) a synthetic resin-based binder, and (c) a crosslinking agent.
  • an olefin-based water repellent and a paraffin-based water repellent includes (b) at least one selected from an olefin-based water repellent and a paraffin-based water repellent, (b) a synthetic resin-based binder, and (c) a crosslinking agent.
  • Olefin (wax), paraffin, acrylic, fluorine, silicone, etc. are known as water repellents, but fluorine and silicone are expensive but olefin and paraffin in terms of performance.
  • it is necessary to use an olefin-based water repellent or a paraffin-based water repellent because it is not superior to the system and acrylic tends to inhibit air permeability.
  • At least one selected from the olefin-based water repellent and the paraffin-based water repellent includes the following.
  • Olefin-based water repellents are also called wax-based water repellents, and are water repellents mainly composed of natural wax, synthetic wax, fatty acid derivatives, etc., and generally have a solid content concentration of 30-5. Mention may be made of 0% by weight of emulsion.
  • Paraffinic water repellents are solid when they contain many long carbon chains and are called petroleum wax, and when they contain many short carbon chains, they are liquid substances at room temperature and normal pressure and are called liquid paraffin.
  • the paraffin wax-based water repellent can be generally used in the form of an emulsion like the olefin fin water repellent.
  • Examples of the synthetic resin binder include the following.
  • Examples of the synthetic resin binder include styrene butadiene resin, acrylic resin, polyester resin, ethylene vinyl acetate copolymer and the like. These components that can be used as a synthetic resin binder may be used alone or in combination.
  • An acryl resin is preferred because the effect of improving water resistance by film formation is observed.
  • SBR styrene-butadiene resin
  • Examples of the crosslinking agent include the following.
  • Examples of the cross-linking agent include polyamide epichlorohydrin resin, polyamine epoxy hydrin resin, melamine resin, urea resin, ketone resin, glioxal, and zirconium carbonate ammonium.
  • the powerful loxyl group in the zirconium carbonate ammonium hydroxyl group reacts directly with the functional groups in the synthetic resin binder and olefin water repellent or paraffin water repellent and crosslinks to form water resistance and water repellency.
  • a sustained effect of the aqueous agent is obtained, and a long-term water leakage preventing effect is obtained, which is preferable.
  • the relative ratio of at least one selected from the olefin-based water repellent and the baraffin-based water repellent which is a component of the water-repellent material used in the present invention to the synthetic resin-based binder is 40 /
  • a range of 60 to 70/30 is preferable, and a range of 45/5/5 to 60/40 is more preferable.
  • the amount of the crosslinking agent (particularly zirconium-based crosslinking agent) added thereto is the total amount of at least one selected from the olefin-based water repellent and the paraffin-based water repellent and the synthetic resin-based binder.
  • the range is from 4 to 2 parts by weight with respect to parts by weight. If it is added in an amount of more than 4 parts by weight, there is a disadvantage that the pot life of the paint is shortened, and if it is less than 2 parts by weight, sufficient effects of water resistance and water repellency cannot be obtained.
  • deodorant used in the present invention natural Zeorai DOO, synthetic Zeorai DOO, synthetic clay, sepiolite DOO, shirasu balloons, activated carbon, C a C 0 3, titanium dioxide, copper CMC, trivalent iron ions, silver-based (Silver supported zeolite), metal oxides, catechins and the like.
  • natural zeoli is most preferable, especially considering the deodorizing performance, cost, and appearance.
  • FIG. 3 is a flowchart of a production method for producing a breathable water-resistant sheet of the present invention by producing a composite sheet material comprising a nonwoven fabric and fine fibrous cellulose using the nonwoven fabric as a base material.
  • the unwinding roll of nonwoven fabric is supplied to the production line from Unreel.
  • This substrate is filled and saturated with water and organic solvents for the purpose of degassing the air in the substrate (pretreatment of the substrate). After that, a pre-prepared slurry of fine fibrous cellulose is coated on the base material (slurry coating on the base material), and water and organic solvent are drained by a vacuum device (vacuum draining). .
  • the non-woven fabric / fine fibrous cellulose that has been evacuated in vacuum is squeezed and drained (squeezed by pressing) after being pressed by a pressing device via a felt, or is dried and fixed (dried and fixed), or as it is.
  • a dried composite sheet made of non-woven fabric and fine fibrous cellulose is produced.
  • FIG. 4 shows a schematic view of an apparatus for producing a composite sheet material including the above steps.
  • the base material (nonwoven fabric) 8 0 0 unwound from the unwinding device 8 2 4 is arranged on a net conveyor 8 1 0 conveyed by a roller 8 2 2.
  • Filling saturant (used for the purpose of degassing the air in the base material) 8 0 4 is confined to the movement of the moving base material 8 0 0. Supplied on the surface of the substrate 8 0 0 in part 8 0 6.
  • the coating slurry 80 2 is supplied from the head box 8 12 onto the surface of the base material 800 so as to synchronize with the movement of the moving base material 800.
  • the base material 8 0 0 moves while passing between the coating roller 1 8 2 0 and the net conveyor 8 1 0, and is connected to a vacuum pump (not shown) etc.
  • a vacuum pump (not shown) etc.
  • the breathable water-resistant sheet of the present invention is produced by laminating and calendering (calendering) after drying (drying and fixing).
  • calendering in order to improve water resistance after the calendar treatment, it may be heat-treated, or may be wound up as necessary.
  • the manufacturing process of the composite sheet material and the laminating process of the water repellent material are continuous processes, but a breathable water-resistant sheet may be manufactured by separating each process.
  • a composite sheet composed of a nonwoven fabric and fine fibrous cellulose in the above production process A method for laminating a water repellent material and a deodorant on a single material will be described in detail.
  • water and a dispersing agent are added to the deodorizer and dispersed by a disperser such as a disperser for a predetermined time to produce a uniform deodorizer slurry.
  • the main component is prepared by mixing the deodorant slurry with a stirring agent of the olefin-based water repellent or paraffin-based water repellent and the synthetic resin-based binder, which is a constituent material of the water repellent material, and then the composite sheet.
  • the cross-linking agent is added with stirring, and water is added to produce a paint with the specified concentration and viscosity.
  • Examples of the coating method of the mixed paint of water repellent material and deodorant include air knife, Mayer bar, gravure, offset gravure, micro gravure, flexo, reverse roll, blade, curtain, die, etc. Any coating method can be used as long as the coating amount can be obtained.
  • the coating amount is preferably in the range of 1.0 to 10.0 g / m 2 , more preferably in the range of 1.5 to 3. O g / m 2 . If it is less than 1.0 g / m 2, sufficient performance may not be obtained due to water resistance and water repellency, and if it exceeds 10 g / m 2 , the water resistance performance is almost saturated. This is because the cost is high.
  • the amount of deodorant applied in the coating layer is preferably in the range of 0.5 to 10 0.0 g / m 2 , more preferably in the range of 1.5 to 6 O g / m 2 . It is. If it is less than 0.5 g /, sufficient deodorizing performance may not be obtained. If it exceeds 1 O. O g / m 2 , the deodorizing performance is almost saturated and the cost is high.
  • the composite sheet material of the present invention has a nonwoven fabric surface and a fine fibrous cellulosic surface, but the coating of the water repellent and deodorant mixed paint is a highly hydrophilic fine fibrous cell surface. It is effective to do for both sides, but of course it may be done on both sides.
  • a deodorant paint prepared by mixing a synthetic resin binder with the deodorant slurry described above is prepared separately.
  • the breathable water-resistant sheet of the present invention can be produced by applying and drying the water repellent coating material on the composite sheet material.
  • the present invention is an absorbent article using the breathable water-resistant sheet as a back cover.
  • absorbent articles include disposable paper diapers and feminine hygiene products, and the back sheet is a sheet provided on the non-contact surface side with the human body as shown in FIG.
  • FIG. 5 is a developed plan view of the disposable paper diaper according to the present embodiment.
  • FIG. 6 is a cross-sectional view taken along line A_B in FIG.
  • paper diapers As shown in FIGS. 5 and 6, disposable paper diapers (hereinafter referred to as paper diapers).
  • the paper diaper main body 30 includes a top sheet 3 1 made of a liquid-permeable nonwoven fabric or the like provided on the contact surface side with the human body, a back sheet 3 2 provided on the outside side when worn, and a top sheet
  • the absorbent body 3 3 interposed between the front sheet 3 1 and the back sheet 3 2, and the absorbent body 3 3 on the top sheet 3 1 side, along the longitudinal direction of the disposable diaper body 30
  • Gear gear sheet 3 4 and 3 4 provided, and the absorbent body 3 3 in the width direction of the paper diaper main body 30 relative to the gear rubber sheet 3 4 and 3 4, the longitudinal direction of the paper diaper main body 30
  • a fluff pulp obtained by pulverizing wood pulp having liquid retention can be used, and a combination of this with a superabsorbent polymer is preferable.
  • a heat-treated mixture of thermoplastic resin, fluff pulp and superabsorbent polymer is preferable.
  • the superabsorbent polymer may be used by mixing with fluff pulp, or may be partially present in the fluff pulp.
  • the superabsorbent polymer is preferably in the form of particles having a retention property capable of absorbing and retaining a liquid having a weight of 20 times or more of its own weight, and having a gelling property.
  • Such a superabsorbent polymer examples include starch-based, cellulose-based, and synthetic polymers. Particularly, starch-acrylic acid (salt) graft copolymer, saponified propane acrylonitrile copolymer, sodium carbonate, and the like. Poximechi Preferred examples include crosslinked cellulose and acrylic acid (salt) polymers.
  • the breathable water-resistant sheet is used as the backsheet 32 provided on the outer side when worn without contacting the human body.
  • the breathable water-resistant sheet of the present invention has sufficient breathability, so that there is very little human skin rash or rash and sufficient water resistance. Therefore, an absorbent article in which moisture such as urine does not leak can be obtained.
  • Fine fibrous cellulose was prepared as follows.
  • hardwood bleached kraft pulp (trade name: Daiwa Showa Marubeni International Co., Ltd. product name: Peace River 1 LBKP) was disaggregated with a pulper at a concentration of 5% by weight for 20 minutes and transferred to a circulation tank.
  • a fine fibrous cellulose was prepared by beating 5% by weight of pulp slurry with a double disc ⁇ ref ina (hereinafter referred to as DDR) under the following conditions. The conditions were as follows. A load was applied as much as possible without causing metal touch (contact between fixed blade and rotary blade).
  • Disc plate Blade width 2. Omm, groove width 3. Omm
  • Blade clearance range from 0.23mm to 0.1 3mm
  • a polypropylene SMS (AVGO L) nonwoven fabric having the following characteristics was used.
  • SMS configuration spunbond (1) (5. 0 g / m 2)
  • the nonwoven fabric (width 1, 5 O Omm, length 10,000 m) was placed in an unwinding device 824 shown in FIG.
  • the non-woven fabric is supplied onto a net conveyor 810 set through rollers 822.
  • a pretreatment was performed to saturate the non-woven fabric with water by supplying water from the filling saturant supply unit 814 at a rate of 17 kg / min onto the non-woven fabric running at 4 Om / min on the net conveyor 810.
  • the water-filled saturant thus supplied is applied at the constriction 806 of the coater header as the nonwoven fabric travels.
  • the clearance between the coating roller _820 and the net conveyor 810 was set to 75 Om by the height adjustment device.
  • the coating slurry 802 is supplied from the storage tank so that the liquid level of the head box 81 2 is 6 Omm. After the above preliminary treatment was completed, the supplied coating slurry 802 was supplied to the above-mentioned nonwoven fabric at a rate of 42 kg / min. This allows fine fibrous cellulose on the nonwoven fabric Layers were formed.
  • Natural Zeolite (Nitto Flour Chemical Co., Ltd., trade name: SP # 2300) 100 parts by weight of dispersant (Sannopco, Inc., trade name: SN Dispersant) 0.5 parts by weight and water By dispersing for 20 minutes, a uniform deodorant slurry having a solid content of 50% by weight was produced.
  • dispersant Sannopco, Inc., trade name: SN Dispersant
  • olefin-based water repellent (trade name: Petrox P 300, manufactured by Meisei Chemical Co., Ltd.) and 48 parts by weight of styrene butadiene resin (product name: SMARTEX PA 3802, manufactured by Japan A & L Co., Ltd.)
  • styrene butadiene resin product name: SMARTEX PA 3802, manufactured by Japan A & L Co., Ltd.
  • zirconium carbonate-based crosslinking agent (trade name: Paycoat 20, manufactured by Nippon Light Metal Co., Ltd.) Add 2 parts by weight and add water.
  • a paint having a total solid content of 40% by weight was prepared. At this time, the viscosity of the paint was 95 mPa ⁇ s.
  • Average particle size 200 nm
  • the mixed paint of the water repellent material and the deodorant was applied to the surface of the composite sheet material obtained above on the fine fibrous cellulose side by the Mayer bar method using the following bar.
  • force-rendering was performed under the following conditions, followed by treatment at 120 ° C. for 30 minutes with a dryer to produce a breathable water-resistant sheet of the present invention.
  • Fine fibrous cellulose basis weight 5 g / m 2
  • Deodorant coating amount 2. 05 g / m 2
  • Water repellent coating amount 2. 05 g / m 2
  • a breathable water-resistant sheet of the present invention was obtained in the same manner as in Example 1, except that the deodorizer composed of natural zeolite was changed to the deodorizer composed of the following ultrafine shirasu balloon.
  • Aluminosilicate glass Composition 69-73% S i O 2 , AI 2 O 3 1 2-1 3%
  • Particle size 20 m or less
  • Deodorant coating amount 2. 05 g / m2
  • Water repellent coating amount 2. 05 g / m2
  • a breathable water-resistant sheet of the present invention was obtained in the same manner as in Example 1 except that the deodorizer composed of natural zeolite was changed to the deodorizer composed of the following synthetic zeolite.
  • Composition C a O 1 3%, AI 2 O 3 30%
  • SMS nonwoven fabric weight 1 5 g / m 2
  • Deodorant coating amount 2.0 g / m2
  • Water repellent coating amount 2.0 g / m2
  • a breathable water-resistant sheet of the present invention was obtained in the same manner as in Example 1 except that the deodorizer composed of natural zeolite candy was changed to the deodorizer composed of the following sepiolite.
  • composition S i 0 2 60.5%, Mg 023.8%, AI 2 0 3 2.
  • Chemical formula S i 12 Mg 8 O 30 (OH) 4 (OH 2 ) 4 8 H 2 0 Particle size: 5 U m or less 88.3%
  • Deodorant coating amount 2.0 g / m2
  • Water repellent coating amount 2.0 g / m2
  • a breathable water-resistant sheet of the present invention was obtained in the same manner as in Example 1, except that the deodorizer made of natural zeolite was changed to the following deodorizer made of synthetic clay.
  • the deodorizer made of natural zeolite was changed to the following deodorizer made of synthetic clay.
  • Deodorant coating amount 2. 05 g / m2
  • Water repellent coating amount 2. 05 g / m2
  • a breathable water-resistant sheet according to the present invention was obtained in the same manner as in Example 1 except that the deodorizer composed of natural zeolite was changed to the following deodorizer composed of silver-supported zeolite.
  • Deodorant coating amount 2.0 g / m2
  • Water repellent coating amount 2.0 g / m2
  • a breathable water-resistant sheet of the present invention was obtained in the same manner as in Example 1 except that the deodorizer composed of natural zeolite was changed to the deodorizer composed of the following synthetic zeolite.
  • Deodorant coating amount 2.1 g / m 2
  • Example 1 the deodorizer composed of natural zeolite was obtained from the following metal oxide.
  • the breathable water-resistant sheet of the present invention was obtained in the same manner except that the deodorizer was changed to the following production conditions.
  • a low-concentration suspension is used as the deodorant. Therefore, the total solid content of the mixed paint of the deodorant and water repellent material was changed from 40% in Example 1 to 35% by weight.
  • the bar diameter was changed to 0.15 mm force, and 0.2 Omm.
  • Deodorant coating amount 2. 05 g / m 2
  • Water repellent coating amount 2. 05 g / m 2
  • Example 9 the same deodorant and water repellent material as in Example 1 were used, the mixing ratio of the deodorant and water repellent material and the bar wire diameter were changed as shown in Table 1 below.
  • a breathable water-resistant sheet of the present invention was prepared in the same manner as in Example 1 except that the material coating amount was fixed at 2 g and the deodorant coating amount was increased to about twice that of Example 1.
  • Example 10 the same deodorant and water repellent material as in Example 1 were used, the mixing ratio of the deodorant and water repellent material and the bar wire diameter were changed as shown in Table 1 below. Except for fixing the coating amount to 2 g and increasing the coating amount of deodorant to about 3 times the amount of Example 1. Produced a breathable water-resistant sheet of the present invention in the same manner as in Example 1.
  • the breathable water resistance of the present invention was the same as in Example 1 except that the olefin water repellent constituting the water repellent material was changed to a paraffin water repellent (trade name: Petrox P 200, manufactured by Meisei Chemical Co., Ltd.). A sheet was obtained.
  • a paraffin water repellent trade name: Petrox P 200, manufactured by Meisei Chemical Co., Ltd.
  • Deodorant coating amount 2. 05 g / m 2
  • Water repellent coating amount 2. 05 g / m 2
  • the air permeability of the present invention was similarly changed in Example 1 except that the olefin-based water repellent constituting the water repellent material was changed to a paraffinic water repellent (trade name: EP-1) manufactured by Aoki Oil & Fat Co., Ltd. A water resistant sheet was obtained.
  • EP-1 paraffinic water repellent
  • Deodorant coating amount 2. 05 g / m2
  • Water repellent coating amount 2. 05 g / m2
  • Table 1 below shows coating data and physical properties of the breathable water-resistant sheet prepared in Example 9 and Example 10. In Table 1, the coating data and physical properties of Example 1 are shown.
  • Example 1 The composite sheet material obtained in Example 1 was used as a comparative sheet. This sheet is not calendered, and water repellent and deodorant are not applied.
  • Example 1 a sheet for comparison was obtained in the same manner except that the coating material using only the following water repellent material without using a deodorant was applied to the composite sheet material by the following method. It was.
  • Olefin-based water repellent (Madesei Chemical Co., Ltd., trade name: Petrox P 300) 50 parts by weight and styrene butadiene resin (Japan A & L Co., Ltd., trade name: Smarttex PA 3802) After mixing to prepare the main agent, just before coating, zirconium carbonate-based crosslinking agent (Nippon Light Metal Co., Ltd., product name: Paycoat 20) Add 2 parts by weight with stirring, add water, and add 40% total solids % Paint was made. At this time, the viscosity of the paint was 95 mPas and was 17 seconds by the Zainkup method.
  • the above-mentioned water repellent paint was applied to the surface of the composite sheet material obtained in Example 1 on the fine fibrous cellulose side with a flexo coater under the following conditions.
  • the coating amount at this time was 2.3 g / m 2 .
  • Air dryer drying temperature 1 00 ° C
  • a sheet was prepared by applying a force render (force render line pressure: 100 kg / cm) and then treating the dryer at 120 ° C for 30 minutes.
  • force render force render line pressure: 100 kg / cm
  • a sheet for comparison of water resistance was obtained in the same manner as in Example 1, except that the following water-repellent material-only paint without using a deodorant was used.
  • Paraffinic water repellent with a total solid content of 30% by weight (manufactured by Aoki Oil & Fat Co., Ltd.
  • the properties of the paraffinic water repellent used here are as follows.
  • the coating amount on the composite sheet was 2. O g / m 2 .
  • a sheet for comparing water resistance was obtained in the same manner as in Comparative Example 4 except that the coating amount of the water repellent material was 5.0 g / m 2 .
  • a sheet for comparison of water resistance was obtained in the same manner as in Example 1, except that the following water-repellent material-only paint without using a deodorant was used.
  • a sheet for comparing water resistance was obtained in the same manner as in Comparative Example 6 except that the coating amount of the water repellent material was 5.0 g / m 2 .
  • Examples 1-2 and comparative example in which force-rendering is performed in the manufacturing process Measure the air permeability and smoothness before and after the force-rendering process on sheet 2 using a densometer (JISP 8 1 1 7) and a Beck smoothness tester (JISP 8 1 1 9). The results are shown in Table 2.
  • Comparative Example 1 and Comparative Example 3 the air permeability and smoothness were measured in the same manner as described above, and are shown in Table 2 as before force rendering treatment.
  • the air permeability of the water-resistant sheet according to the present invention is improved in the printability due to the smoothness being increased by the calendaring process, and is correlated with the air permeability. It was confirmed that the air permeability with increased.
  • Comparative Example 4 water leakage was observed 10 minutes after the start of the test, and the water resistance was insufficient compared to the Example.
  • Comparative Example 5 no water leakage was observed 1 minute after the start of the test, but water leakage was observed 20 minutes after the start of the test, and the water resistance was insufficient compared to the Examples. It was.
  • Comparative Example 6 water leakage occurred 5 minutes after the start of the test, and the water resistance was insufficient compared to the Example.
  • Comparative Example 7 no water leak was observed 1 minute after the start of the test, but a water leak occurred 15 minutes after the start of the test, and the water resistance was insufficient compared to the Example.
  • the conditions of the above water resistance test are more severe than the actual usage conditions of a commercially available diaper for a baby diaper.
  • the breathable water resistant sheet according to the present invention (Examples 1 to 12) was not commercially available. Even if used as a backsheet for children's diapers, there is no risk of leakage for a long time, and it can withstand actual use.
  • the deodorization performance with ammonia was evaluated by the following procedure using the equipment shown in Fig. 7.
  • the sheets of Examples 1 to 12 and Comparative Examples 1 to 3 were used as samples for the next (1).
  • Example 1 An example demonstrating that the breathable water-resistant sheet obtained in Example 1 can be applied to the backsheet part of a children's diaper will be described.
  • the diaper an actual wearing test was carried out in which an infant is actually put on a product in which the backsheet portion of a commercially available diaper is replaced with the breathable water-resistant sheet of the present invention.

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  • Animal Behavior & Ethology (AREA)
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  • Laminated Bodies (AREA)

Abstract

L'invention concerne une feuille utilisable dans des matériaux hygiéniques tels que des couches et des matériaux médicaux, qui est un matériau de feuille composite comprenant de la cellulose microfibreuse et un tissu non tissé et qui a été amélioré dans la propriété de prévention de la fuite de liquide et la performance de désodorisation. Une feuille perméable à l'air et résistante à l'eau dans laquelle un mélange (2) d'une matière hydrofuge avec un désodorisant est laminée sur un matériau (1) de feuille composite comprenant de la cellulose microfibreuse et un tissu non tissé. Il est préférable que le matériau repoussant l'eau décrit ci-dessus soit une feuille perméable à l'air et résistante à l'eau contenant un agent hydrofuge à base d'oléfine, un liant de type résine synthétique et un agent réticulant ; le tissu non tissé décrit ci-dessus est un tissu non tissé filé par fusion ; le liant de type résine synthétique décrit ci-dessus est une résine de styrène-butadiène ; et l'agent réticulant est le carbonate de zirconium et d'ammonium.
PCT/JP2007/001300 2006-11-28 2007-11-26 Feuille perméable à l'air et résistante à l'eau et article absorbant utilisant celle-ci WO2008065748A1 (fr)

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WO2014105798A1 (fr) * 2012-12-28 2014-07-03 E. I. Du Pont De Nemours And Company Matériau isolant contenant de la nanocellulose
WO2017002777A1 (fr) * 2015-06-30 2017-01-05 国立大学法人九州大学 Tissu non-tissé modifié pour filtration d'air, dispositif de filtration d'air configuré à partir de celui-ci, et procédé de fabrication de tissu non-tissé modifié
JP2017019283A (ja) * 2011-10-13 2017-01-26 大王製紙株式会社 ３層積層シートの製造方法
JP6488042B1 (ja) * 2018-03-29 2019-03-20 大王製紙株式会社 吸収性物品
RU2771691C2 (ru) * 2018-03-29 2022-05-11 Дайо Пейпер Корпорейшн Впитывающее изделие

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JP5502742B2 (ja) * 2008-10-17 2014-05-28 大王製紙株式会社 耐水性高通気性複合シート及びその製造方法
WO2010044169A1 (fr) * 2008-10-17 2010-04-22 株式会社日本吸収体技術研究所 Feuille composite résistant à l’eau et à perméabilité à l’air élevée et processus de production de la feuille résistant à l’eau et à perméabilité à l’air élevée
JP2017210001A (ja) * 2011-10-13 2017-11-30 大王製紙株式会社 多孔性を有する３層積層シート及びその製造方法、並びに３層積層シートからなる蓄電素子用セパレータ
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WO2013054936A1 (fr) * 2011-10-13 2013-04-18 大王製紙株式会社 Feuille stratifiée à trois couches poreuses et procédé pour sa fabrication, et séparateur pour élément de stockage d'électricité comprenant une feuille stratifiée à trois couches
WO2014105798A1 (fr) * 2012-12-28 2014-07-03 E. I. Du Pont De Nemours And Company Matériau isolant contenant de la nanocellulose
WO2017002777A1 (fr) * 2015-06-30 2017-01-05 国立大学法人九州大学 Tissu non-tissé modifié pour filtration d'air, dispositif de filtration d'air configuré à partir de celui-ci, et procédé de fabrication de tissu non-tissé modifié
JP2017014643A (ja) * 2015-06-30 2017-01-19 国立大学法人九州大学 空気濾過用改質不織布、これを構成材料とする空気濾過装置、及び、改質不織布の製造方法。
JP6488042B1 (ja) * 2018-03-29 2019-03-20 大王製紙株式会社 吸収性物品
WO2019188566A1 (fr) * 2018-03-29 2019-10-03 大王製紙株式会社 Article absorbant
JP2019170942A (ja) * 2018-03-29 2019-10-10 大王製紙株式会社 吸収性物品
RU2771691C2 (ru) * 2018-03-29 2022-05-11 Дайо Пейпер Корпорейшн Впитывающее изделие
US11963857B2 (en) 2018-03-29 2024-04-23 Daio Paper Corporation Absorbent article

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