EP0963186A1 - Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante - Google Patents

Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante

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Publication number
EP0963186A1
EP0963186A1 EP97929709A EP97929709A EP0963186A1 EP 0963186 A1 EP0963186 A1 EP 0963186A1 EP 97929709 A EP97929709 A EP 97929709A EP 97929709 A EP97929709 A EP 97929709A EP 0963186 A1 EP0963186 A1 EP 0963186A1
Authority
EP
European Patent Office
Prior art keywords
absorbent
zeolite
absorbent article
silica
odour control
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP97929709A
Other languages
German (de)
English (en)
Other versions
EP0963186A4 (fr
Inventor
Mario Guarracino
Alessandro Gagliardini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
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 Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to EP97929709A priority Critical patent/EP0963186A4/fr
Publication of EP0963186A1 publication Critical patent/EP0963186A1/fr
Publication of EP0963186A4 publication Critical patent/EP0963186A4/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/18—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
    • A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
    • A61L15/42—Use of materials characterised by their function or physical properties
    • A61L15/46—Deodorants or malodour counteractants, e.g. to inhibit the formation of ammonia or bacteria
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
    • A61L2300/10—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices containing or releasing inorganic materials
    • A61L2300/102—Metals or metal compounds, e.g. salts such as bicarbonates, carbonates, oxides, zeolites, silicates

Definitions

  • the present invention relates to absorbent articles, in particular sanitary napkins and panty liners comprising compositions providing odour control benefits.
  • odour controlling agents for use in absorbent articles in order to address the problem of malodour formation. These agents can typically be classified according to the type of odour the agent is intended to combat. Odours may be classified as being acidic, basic or neutral. Acidic odour controlling agents have a pH greater than 7 and typically include inorganic carbonates, bicarbonates, phosphates and sulphates. Basic odour controlling agents have a pH of less than 7 and include compounds such as citric acid, boric acid and maleic acid.
  • Neutral odour controlling agents have a pH of approximately 7. Examples of these types of compounds include activated carbons, clays, zeolites, silicas and starches. Such neutral odour controlling agents are most commonly utilised in absorbent articles.
  • EPO 348 978 discloses an absorbent article comprising an odour control system wherein the neutral odour controlling particles are selected from carbon, clays, silicas, zeolites and molecular sieves.
  • EPO 510 619 relates to absorbent article comprising odour control complex including a combination of at least 2 agents selected form a group which includes zeolites and silica gels.
  • WO 91/12029 discloses the combination of zeolites and absorbent gelling materials to provide improvement in the control of ammonia odours.
  • EPO 282 287 discloses a deodouriser suitable for use in a sanitary napkin which is non black (i.e. carbon free) comprising at least one compound selected from metal silicates and metal salts of aluminum containing silicates selected from certain transition metals and group II metals.
  • the currently preferred odour control agent is zeolite, particularly the so-called intermediate and high ratio zeolites.
  • zeolite does not have a negative aesthetic profile, its main drawback is its lack of effective odour control over a broad range of odour types and the cost of such materials particularly the intermediate and high ratio zeolites.
  • the present invention relates to an absorbent article comprising a liquid pervious topsheet, a backsheet and an absorbent core intermediate said topsheet and said backsheet, characterised in that said absorbent article comprises an odour control system comprising the combination of zeolite, silica and absorbent gelling material.
  • the present invention relates to absorbent disposable articles such as sanitary napkins, baby diapers, incontinence products and panty liners.
  • the absorbent article of the present invention comprises the essential features of a liquid pervious topsheet a backsheet and an absorbent core intermediate the topsheet and the backsheet.
  • the absorbent article further comprises as an essential component an odour control system.
  • the absorbent article comprises as an essential feature an odour control system which comprises the combination of zeolite, silica and absorbent gelling material.
  • the odour control system has been found to provide effective odour control over a broad spectrum of odours, typically found in absorbent articles.
  • the odour control system thus comprises as an essential component an absorbent gelling material.
  • absorbent gelling materials sometimes referred to as "super-sorbers" are becoming broadly used in absorbent articles.
  • AGM's are materials which have fluid-absorbing properties. Such materials form hydrogels on contact with water (e.g., with urine, blood, and the like).
  • One highly preferred type of hydrogel- forming, absorbent gelling material is based on polyacids, especially polyacrylic acid.
  • Hydrogel- forming polymeric materials of this type are those which, upon contact with fluids (i.e., liquids) such as water or body fluids, imbibe such fluids and thereby form hydrogels.
  • These preferred absorbent gelling materials will generally comprise substantially water-insoluble, slightly cross-linked, partially neutralized, hydrogel-forming polymer materials prepared from polymerizabte, unsaturated, acid-containing monomers.
  • the polymeric component formed from unsaturated, acid-containing monomers may comprise the entire gelling agent or may be grafted onto other types of polymer moieties such as starch or cellulose.
  • Acrylic acid grafted starch materials are of this latter type.
  • the preferred absorbent gelling materials include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, polyacrylates, maleic anhydride-based copolymers and combinations thereof.
  • Especially preferred absorbent gelling materials are the polyacrylates and acrylic acid grafted starch.
  • crosslinking serves to render these preferred hydrogel-forming absorbent materials substantially water-insoluble, and cross-linking also in part determines the gel volume and extractable polymer characteristics of the hydrogels formed therefrom.
  • Suitable cross-linking agents are well known in the art and include, for example, (1) compounds having at least two polymerizable double bonds; (2) compounds having at least one polymerizable double bond and at least one functional group reactive with the acid-containing monomer material; (3) compounds having at least two functional groups reactive with the acid-containing monomer materials; and (4) polyvalent metal compounds which can from ionic cross-linkages.
  • cross-linking agents of the foregoing types are described in greater detail in Masuda et al; U.S. Patent 4,076,663; Issued February 28, 1978.
  • Preferred cross-linking agents are the di- or polyesters of unsaturated mono-or polycarboxylic acids with polyols, the bisacrylamides and the di-or triallyl amines.
  • Especially preferred cross-linking agents are N,N'- methylenebisacrylamide, trimethylol propane triacrylate and triallyl amine.
  • the cross-linking agent will generally comprise from about 0.001 mole percent to 5 mole percent of the preferred materials. More preferably, the cross-linking agent will comprise from about 0.01 mole percent to 3 mole percent of the gelling materials used herein.
  • the preferred, slightly cross-linked, hydrogel-forming absorbent gelling materials will generally be employed in their partially neutralized form.
  • such materials are considered partially neutralized when at least 25 mole percent, and preferably at least 50 mole percent of monomers used to form the polymer are acid group-containing monomers which have been neutralized with a salt-forming cation.
  • Suitable salt-forming cations include alkali metal, ammonium, substituted ammonium and amines. This percentage of the total monomers utilized which are neutralized acid group- containing monomers is referred to as the "degree of neutralization".
  • commercial absorbent gelling materials have a degree of neutralization somewhat less than 90%.
  • the preferred absorbent gelling materials used herein are those which have a relatively high capacity for imbibing fluids encountered in the absorbent articles; this capacity can be quantified by referencing the "gel volume" of said absorbent gelling materials.
  • Gel volume can be defined in terms of the amount of synthetic urine absorbed by any given absorbent gelling agent buffer and is specified as grams of synthetic urine per gram of gelling agent.
  • Gel volume in synthetic urine can be determined by forming a suspension of about 0.1-0.2 parts of dried absorbent gelling material to be tested with about 20 parts of synthetic urine. This suspension is maintained at ambient temperature under gentle stirring for about 1 hour so that swelling equilibrium is attained. The gel volume (grams of synthetic urine per gram of absorbent gelling material) is then calculated from the weight fraction of the gelling agent in the suspension and the ratio of the liquid volume excluded from the formed hydrogel to the total volume of the suspension.
  • the preferred absorbent gelling materials useful in this invention will have a gel volume of from about 20 to 70 grams, more preferably from about 30 to 60 grams, of synthetic urine per gram of absorbent gelling material.
  • Extractable polymer levels can be determined by contacting a sample of preferred absorbent gelling material with a synthetic urine solution for the substantial period of time (e.g., at least 16 hours) which is needed to reach extraction equilibrium, by then filtering the formed hydrogel from the supernatant liquid, and finally by then determining the polymer content of the filtrate.
  • the particular procedure used to determine extractable polymer content of the preferred absorbent gelling agent buffers herein is set forth in Brandt, Goldman and Inglin; U.S.
  • absorbent gelling materials which are especially useful in the absorbent articles herein are those which have an equilibrium extractables content in synthetic urine of no more than about 17%, preferably no more than about 10% by weight of the absorbent gelling material.
  • absorbent gelling materials herein before described are typically used in the form of discrete particles.
  • Such absorbent gelling materials can be of any desired shape, e.g., spherical or semi-spherical, cubic, rod-like polyhedral, etc. Shapes having a large greatest dimension/smallest dimension ratio, like needles and flakes, are also contemplated for use herein. Agglomerates of absorbent gelling material particles may also be used.
  • the size of the absorbent gelling material particles may vary over a wide range. For reason of industrial hygiene, average particle sizes smaller than about 30 microns are less desirable. Particles having a smallest dimension larger than about 2mm may also cause a feeling of grittyness in the absorbent article, which is undesirable from a consumer aesthetics standpoint. Furthermore, rate of fluid absorption can be affected by particle size. Larger particles have very much reduced rates of absorption. Preferred for use herein are absorbent gelling material s particles substantially all of which have a particle size of from about 30 microns to about 2mm. "Particle Size as used herein means the weighted average of the smallest dimension of the individual particles.
  • the amount of absorbent gelling material particles used in the present invention will typically range from 20gr ⁇ r 2 to 150grrr 2 , preferably from 40gr ⁇ r 2 to 110gr ⁇ r 2 , more preferably from 55gm -2 to 85gm -2 .
  • Suitable zeolite odour control material for use in the odour control system of the present invention is well know in the literature and is described in the following reference texts: ZEOLITE SYNTHESIS, ACS Symposium Series 398, Eds. M. L. Occelli and H. E Robson (1989) pages 2-7; ZEOLITE MOLECULAR SIEVES, Structure, Chemistry and Use, by D. W. Breck, John Wiley and Sons (1974) pages 245-250, 313-314 and 348-352; MODERN APPLICATIONS OF MOLECULAR SIEVE ZEOLITES, Ph.D. Dissertation of S. M. Kuznicki, U. of Utah (1980), available from University of Microfilms International, Ann Arbor, Michigan, pages 2-8.
  • Zeolites are crystalline aluminosilicates of group IA and group HA elements such as Na, K, Mn, Ca and are chemically represented by the empirical formula :
  • n is the cation valence
  • w is the water content in the voids of the zeolite.
  • zeolites are complex, crystalline inorganic polymers based on an infinitely extending framework of AIO4 and S1O4 tetrahedra linked to each other by sharing of oxygen ions.
  • This framework structure contains channels or interconnected voids that are occupied by the cations and water molecules.
  • the structural formula of a zeolite is based on the crystal unit cell, the smallest unit of structure, represented by
  • n is the valence of cation M
  • w is the number of water molecules per unit cell
  • x and y are the total number of tedrahedra per unit cell
  • y/x usually having values of 1-5.
  • Zeolites may be naturally derived or synthetically manufactured.
  • the synthetic zeolites being preferred for use herein and include zeolite A, zeolite P, zeolite Y, zeolite X, zeolite DAY, zeolite ZSM-5, and mixtures thereof. Most preferred are zeolite A and zeolite Y and mixtures thereof.
  • the zeolite is preferably hydrophobic. This is typically achieved by increasing the molar ratio of the Si ⁇ 2 to AIO2 content such that the ratio of x to y is at least 1 , preferably from 1 to 500, most preferably from 1 to 6.
  • the absorbent article preferably comprises from 40gr ⁇ r 2 to 90gnrr 2 , more preferably from 55gnrr 2 to 85gm -2 , most preferably from 60gm -2 to 65gr ⁇ r 2 of said zeolite.
  • the odour control system comprises as an essential component silica.
  • Silica i.e. silicon dioxide, Si ⁇ 2 exists in a variety of crystalline forms and amorphous modifications, and can be derived from both natural sources e.g. diatomaceous earth and synthetic sources, any of which are suitable for use herein. Silica molecular sieves do not fall within the definition of silica as used herein.
  • silicas having a high surface area or in agglomerated form are preferred.
  • the silica is in a highly purified form such that is contains at least 90%, preferably 95%, more preferably 99% silicon dioxide.
  • the silica is silica gel having a 100% silica content.
  • the silica may be provided from other sources such as metal silicates including sodium silicate.
  • Preferred silica include non crystalline silica (e.g. amorphous silica, appearing as white free flowing powder), having a particle size 4-12 microns, a pore volume 1-2 g/ml or a granular silica of aggregated particles (e.g. silica gel, having a maximum particle dimensions of 1.6 mm in diameter).
  • non crystalline silica e.g. amorphous silica, appearing as white free flowing powder
  • a particle size 4-12 microns e.g. amorphous silica, appearing as white free flowing powder
  • a pore volume 1-2 g/ml e.g. silica gel, having a maximum particle dimensions of 1.6 mm in diameter
  • silica gel having a medium pore diameter of from 40 A to 150 A, preferably from 60A to 130 A, most preferably from 90 A to 110 A, a surface area of from 100m2/g to 800m2/g, preferably from 200m2/g to 550m2/g, most preferably from 250m2/g to 350 m2/g and an average particle size of 15 to 200microns, preferably from 63 to 200 microns.
  • the absorbent article preferably comprises from 40gm -2 to 100gnrr 2 , more preferably from 60gr ⁇ r 2 to 90gm -2 , most preferably from 60gm ⁇ 2 to 65g ⁇ r 2 of silica based on 100% purity.
  • the ratio of absorbent gelling material to silica to zeolite is typically in the range of from 1 :5:1 to 1 :1 :5, preferably from 1 :3:1 to 1 :1 :3, most preferably from 1:1 :1 to 1 :1.5:1.5.
  • the weight of the odour control system which may be used in the absorbent article can be readily determined by the skilled person bearing in mind the absorbent article dimensions.
  • the absorbent article when utilised in a sanitary napkin or panty liner, may comprise from 0.5g to 5g, preferably from 1g to 3g, most preferably from 1.5g to 2.5g of said odour control system.
  • the odour control system may comprise additional optional components such as antimicrobial agents, perfuming ingredients, masking agents, activated carbon, and chelants, all of which are known to the those skilled in the art.
  • the odour control system may be incorporated into the absorbent article by any of the methods disclosed in the art, for example it may be layered on the core of the absorbent article or mixed within the fibres of the absorbent core.
  • the odour control system is preferably incorporated between two layers of cellulose tissue.
  • the system may be bonded between two cellulose tissue layers with, for example, a hot melt adhesive or any suitable bonding system.
  • the odour control system is incorporated in a layered structure in accordance with the disclosure of WO 94/01069 or Italian patent application number TO 93A 001028.
  • TO 93A 001028 describes a layered structure substantially as described in WO 94/01069 with the exception that TO 93A 001028 comprises a much higher quantity of absorbent gelling material (AGM) in the intermediate layer which is between the fibrous layers (120gm -2 ) that would be incorporated as an optional component in the present invention.
  • the intermediate layer comprises, in particular, a polyethylene powder as thermoplastic material which is mixed with the premixed odour control system of the present invention.
  • the mixture is then heated such that the polyethylene melts and glues the laminate layers and components together.
  • the bridges which form the bond points between the fibrous layers involve particles of AGM as well as particles of thermoplastic material. (The absorbent capacity of the AGM is unaffected by bonding.)
  • the adhesive lines are preferably also placed on the edges of the laminate to ensure that the edges of the laminate stick and any loose odour control material does not fall out of the laminate.
  • the absorbent core can include the following components: (a) an optional primary fluid distribution layer preferably together with a secondary optional fluid distribution layer; (b) a fluid storage layer; (c) an optional fibrous ("dusting") layer underlying the storage layer; and (d) other optional components.
  • the absorbent core may have any thickness depending on the end use envisioned.
  • One optional component of the absorbent core according to the present invention is a primary fluid distribution layer and a secondary fluid distribution layer.
  • the primary distribution layer typically underlies the topsheet and is in fluid communication therewith.
  • the topsheet transfers the acquired fluid to this primary distribution layer for ultimate distribution to the storage layer.
  • This transfer of fluid through the primary distribution layer occurs not only in the thickness, but also along the length and width directions of the absorbent product.
  • the also optional but preferred secondary distribution layer typically underlies the primary distribution layer and is in fluid communication therewith. The purpose of this secondary distribution layer is to readily acquire fluid from the primary distribution layer and transfer it rapidly to the underlying storage layer. This helps the fluid capacity of the underlying storage layer to be fully utilised.
  • the fluid distribution layers can be comprised of any material typical for such distribution layers. In particular fibrous layers maintain the capillaries between fibers even when wet are useful as distribution layers.
  • Fluid Storage Layer Positioned in fluid communication with, and typically underlying the primary or secondary distribution layers, is a fluid storage layer.
  • the fluid storage layer can comprise any usual absorbent material or combinations thereof. It preferably comprises absorbent gelling materials in combination with suitable carriers.
  • Suitable carriers include materials which are conventionally utilised in absorbent structures such as natural, modified or synthetic fibers, particularly modified or non-modified cellulose fibers, in the form of fluff and/or tissues. Suitable carriers can be used together with the absorbent gelling material, however, they can also be used alone or in combinations. Most preferred are tissue or tissue laminates in the context of sanitary napkins and panty liners.
  • An embodiment of the absorbent structure made according to the present invention may comprise multiple layers comprises a double layer tissue laminate formed by folding the tissue onto itself. These layers can be joined to each other for example by adhesive or by mechanical interlocking or by hydrogen bridge bands. Absorbent gelling material or other optional material can be comprised between the layers.
  • Modified cellulose fibers such as the stiffened cellulose fibers can also be used.
  • Synthetic fibers can also be used and include those made of cellulose acetate, polyvinyl fluoride, polyvinylidene chloride, acrylics (such as Orion), polyvinyl acetate, non-soluble polyvinyl alcohol, polyethylene, polypropylene, polyamides (such as nylon), polyesters, bicomponent fibers, tricomponent fibers, mixtures thereof and the like.
  • the fiber surfaces are hydrophilic or are treated to be hydrophilic.
  • the storage layer can also include filler materials, such as Perlite, diatomaceous earth, Vermiculite, etc., to improve liquid retention.
  • the storage layer can nevertheless be locally homogenous, i.e. have a distribution gradient in one or several directions within the dimensions of the storage layer.
  • Non-homogeneous distribution can also refer to laminates of carriers enclosing absorbent gelling materials partially or fully.
  • c Optional Fibrous ("Dusting") Layer An optional component for inclusion in the absorbent core according to the present invention is a fibrous layer adjacent to, and typically underlying the storage layer. This underlying fibrous layer is typically referred to as a "dusting" layer since it provides a substrate on which to deposit absorbent gelling material in the storage layer during manufacture of the absorbent core.
  • this fibrous "dusting” layer need not be included.
  • this "dusting” layer provides some additional fluid-handling capabilities such as rapid wicking of fluid along the length of the pad.
  • the absorbent core according to the present invention can include other optional components normally present in absorbent webs.
  • a reinforcing scrim can be positioned within the respective layers, or between the respective layers, of the absorbent core.
  • Such reinforcing scrims should be of such configuration as to not form interfacial barriers to fluid transfer. Given the structural integrity that usually occurs as a result of thermal bonding, reinforcing scrims are usually not required for thermally bonded absorbent structures.
  • the topsheet is the topsheet
  • the absorbent article comprises as an essential component a topsheet
  • the topsheet may comprise a single layer or a multiplicity of layers.
  • the topsheet comprises a first layer which provides the user facing surface of the topsheet and a second layer between the first layer and the absorbent structure/core.
  • the topsheet as a whole and hence each layer individually needs to be compliant, soft feeling, and non-irritating to the wearer's skin. It also can have elastic characteristics allowing it to be stretched in one or two directions.
  • the topsheet may be formed from any of the materials available for this purpose and known in the art, such as woven and non woven fabrics and films.
  • at least one of the layers, preferably the upper layer, of the topsheet comprises a hydrophobic, liquid permeable apertured polymeric film.
  • the upper layer is provided by a film material having apertures which are provided to facilitate liquid transport from the wearer facing surface towards the absorbent structure.
  • the lower layer preferably comprises a non woven layer, an apertured formed film or an airlaid tissue.
  • the absorbent article comprises as an essential component a backsheet.
  • the backsheet primarily prevents the extrudes absorbed and contained in the absorbent structure from wetting articles that contact the absorbent product such as underpants, pants, pyjamas and undergarments.
  • the backsheet is preferably impervious to liquids (e.g. menses and/or urine) and is preferably manufactured from a thin plastic film, although other flexible liquid impervious materials can also be used.
  • the term "flexible” refers to materials that are compliant and will readily conform to the general shape and contours of the human body.
  • the backsheet also can have elastic characteristics allowing it to stretch in one or two directions.
  • the backsheet typically extends across the whole of the absorbent structure and can extend into and form part of or all of the preferred sideflaps, side wrapping elements or wings.
  • the backsheet can comprise a woven or nonwoven material, polymeric films such as thermoplastic films of polyethylene or polypropylene, or composite materials such as a film-coated nonwoven material.
  • the backsheet is a polyethylene film having a thickness of from about 0.012 mm (0.5 mil) to about 0.051 mm (2.0 mils).
  • Exemplary polyethylene films are manufactured by Clopay Corporation of Cincinnati, Ohio, under the designation P18-0401 and by Ethyl Corporation, Visqueen Division, of Terre Haute, Indiana, under the designation XP-39385.
  • the backsheet is preferably embossed and/or matt finished to provide a more clothlike appearance. Further, the backsheet can permit vapours to escape from the absorbent structure, i.e. be breathable, while still preventing extrudates from passing through the backsheet. Also breathable backsheets comprising several layers, e.g. film plus non-woven structures, can be used.
  • the sanitary napkins used in the following examples were Always (Always is a registered Trade Mark) as sold by the Procter & Gamble Company. Each napkin was opened by cutting the wrap around the perforated coverstock at its bottom face approximately along a longitudinal edge of the release paper which covers the external adhesive layer. The side of the absorbent fibrous core is then exposed by slightly shifting the water impermeable plastic bottom layer and subsequently, the fibrous core is split into two halves, each having approximately the same thickness, along a plane which is parallel to the plane of the napkin itself. The odour control system is homogeneously distributed between these tow fibrous layers which are then joined together to reconstitute the absorbent core.
  • the water impermeable inner backsheet is then put back into its original position and the wrap around perforated coverstock is sealed along the cut by means of a e.g. a double sided adhesive tape.
  • Samples were produced using the method above, containing the odour control systems as described hereinbelow.
  • the zeolite (0.5g) used was zeolite A, Wessalith CS, available from Degussa AG.
  • the silica (0.5g) used was Syloblanc 82 available from Grace GmbH or Silica FK 700, available from Degussa.
  • the AGM (0.7g) used was XZ 9589001 , available from Dow Chemicals.

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

L'invention porte sur des articles absorbants et en particulier sur des serviettes hygiéniques comportant un système d'élimination des odeurs offrant des avantages améliorés en la matière et comprenant une combinaison de zéolite, de silice et d'une matière gélifiante absorbante.
EP97929709A 1996-06-07 1997-05-23 Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante Ceased EP0963186A4 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97929709A EP0963186A4 (fr) 1996-06-07 1997-05-23 Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP96109174 1996-06-07
EP96109174 1996-06-07
EP97929709A EP0963186A4 (fr) 1996-06-07 1997-05-23 Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante
PCT/US1997/008972 WO1997046192A1 (fr) 1996-06-07 1997-05-23 Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante

Publications (2)

Publication Number Publication Date
EP0963186A1 true EP0963186A1 (fr) 1999-12-15
EP0963186A4 EP0963186A4 (fr) 2000-12-06

Family

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Family Applications (1)

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EP97929709A Ceased EP0963186A4 (fr) 1996-06-07 1997-05-23 Articles absorbants a systeme eliminant les odeurs compose de silice, de zeolite et d'une matiere gelifiante absorbante

Country Status (6)

Country Link
EP (1) EP0963186A4 (fr)
JP (1) JPH11513917A (fr)
KR (1) KR100344139B1 (fr)
AU (1) AU734552B2 (fr)
CA (1) CA2257626A1 (fr)
WO (1) WO1997046192A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2258408A1 (fr) 2006-04-05 2010-12-08 The Procter & Gamble Company Articles absorbant avec un système de contrôle des odeurs.
EP2957301A1 (fr) 2014-06-20 2015-12-23 Omya International AG Procédé pour le contrôle des odeurs
EP3326659A1 (fr) 2016-11-23 2018-05-30 Toiletry Sales Limited Articles absorbants comprenant un mélange de contrôle des odeurs

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6245693B1 (en) * 1996-12-20 2001-06-12 The Procter & Gamble Company Laminated composite absorbent structure comprising odor control means
SE9902207L (sv) 1999-06-11 2000-12-12 Sca Hygiene Prod Ab Användning av fukttät förpackning för absorberande alster innehållande fuktkänsliga tillsatser
SE0101033L (sv) 2001-03-23 2002-04-09 Sca Hygiene Prod Ab Trosskydd samt användning av låghygroskopiska material för att tillverka ett trosskydd
GB0202061D0 (en) * 2002-01-30 2002-03-13 Reckitt Benckiser Uk Ltd Chemical compositions amd methods
US8217220B2 (en) 2005-10-05 2012-07-10 Sca Hygiene Products Ab Absorbent article comprising a thin film including an active agent
BRPI0622130B1 (pt) 2006-11-17 2016-02-10 Sca Hygiene Prod Ab artigos absorventes compreendendo um sal orgânico de zinco e um agente antibacteriano ou cloreto de metal alcalino ou cloreto de metal alcalino terroso
EP2086596B1 (fr) 2006-11-17 2013-05-08 SCA Hygiene Products AB Articles absorbants comprenant des fibres cellulosiques acides et un sel de zinc organique
US8835511B2 (en) 2007-04-04 2014-09-16 The Procter & Gamble Company Absorbent articles including an odor control system
JP4667485B2 (ja) * 2008-04-21 2011-04-13 花王株式会社 吸収性物品
JP6685400B2 (ja) 2015-12-10 2020-04-22 ザ プロクター アンド ギャンブル カンパニーＴｈｅ Ｐｒｏｃｔｅｒ ＆ Ｇａｍｂｌｅ Ｃｏｍｐａｎｙ 臭気制御組成物を含む物品
US10888635B2 (en) 2016-06-16 2021-01-12 The Procter & Gamble Company Absorbent article having odor absorbing material
WO2017214924A1 (fr) * 2016-06-16 2017-12-21 The Procter & Gamble Company Article absorbant comportant un matériau absorbant les odeurs
EP3554567B1 (fr) * 2016-12-19 2023-10-25 The Procter & Gamble Company Article comprenant des zéolites
KR101944109B1 (ko) * 2018-06-19 2019-01-30 주식회사 일레븐모먼트 페라이트 소결체와 제올라이트를 포함하는 패드용 기능성 패치
TWI818054B (zh) 2018-08-31 2023-10-11 美商陶氏全球科技有限責任公司 具有氣味控制組分之纖維
KR102000149B1 (ko) * 2019-01-08 2019-08-14 주식회사 일레븐코퍼레이션 천연 흡수 기반 인체무해 기능성 패치

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EP0389015A2 (fr) * 1989-03-20 1990-09-26 The Procter & Gamble Company Structures absorbantes avec moyens de contrôle de l'odeur
EP0389023A2 (fr) * 1989-03-20 1990-09-26 The Procter & Gamble Company Structures absorbantes avec moyens de contrôle de l'odeur
EP0629411A1 (fr) * 1993-06-18 1994-12-21 SANYO CHEMICAL INDUSTRIES, Ltd. Composition absorbante et couche à jeter contenant cette composition

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US5407442A (en) * 1990-02-12 1995-04-18 Karapasha; Nancy Carbon-containing odor controlling compositions

Patent Citations (3)

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EP0389015A2 (fr) * 1989-03-20 1990-09-26 The Procter & Gamble Company Structures absorbantes avec moyens de contrôle de l'odeur
EP0389023A2 (fr) * 1989-03-20 1990-09-26 The Procter & Gamble Company Structures absorbantes avec moyens de contrôle de l'odeur
EP0629411A1 (fr) * 1993-06-18 1994-12-21 SANYO CHEMICAL INDUSTRIES, Ltd. Composition absorbante et couche à jeter contenant cette composition

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See also references of WO9746192A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2258408A1 (fr) 2006-04-05 2010-12-08 The Procter & Gamble Company Articles absorbant avec un système de contrôle des odeurs.
EP2957301A1 (fr) 2014-06-20 2015-12-23 Omya International AG Procédé pour le contrôle des odeurs
EP3326659A1 (fr) 2016-11-23 2018-05-30 Toiletry Sales Limited Articles absorbants comprenant un mélange de contrôle des odeurs

Also Published As

Publication number Publication date
AU3370297A (en) 1998-01-05
KR100344139B1 (ko) 2005-01-15
KR20000016433A (ko) 2000-03-25
JPH11513917A (ja) 1999-11-30
AU734552B2 (en) 2001-06-14
EP0963186A4 (fr) 2000-12-06
CA2257626A1 (fr) 1997-12-11
WO1997046192A1 (fr) 1997-12-11
MX9810338A (es) 1999-04-01

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