EP0473660A1 - Absorbierendes produkt - Google Patents

Absorbierendes produkt

Info

Publication number
EP0473660A1
EP0473660A1 EP90908254A EP90908254A EP0473660A1 EP 0473660 A1 EP0473660 A1 EP 0473660A1 EP 90908254 A EP90908254 A EP 90908254A EP 90908254 A EP90908254 A EP 90908254A EP 0473660 A1 EP0473660 A1 EP 0473660A1
Authority
EP
European Patent Office
Prior art keywords
water
resilient
topsheet
article according
diaper
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.)
Withdrawn
Application number
EP90908254A
Other languages
English (en)
French (fr)
Inventor
David Marshall
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.)
Ciba Specialty Chemicals Water Treatments Ltd
Original Assignee
Allied Colloids Ltd
Ciba Specialty Chemicals Water Treatments Ltd
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
Priority claimed from GB898911958A external-priority patent/GB8911958D0/en
Priority claimed from GB909006545A external-priority patent/GB9006545D0/en
Application filed by Allied Colloids Ltd, Ciba Specialty Chemicals Water Treatments Ltd filed Critical Allied Colloids Ltd
Publication of EP0473660A1 publication Critical patent/EP0473660A1/de
Withdrawn legal-status Critical Current

Links

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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • 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
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • 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
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15365—Dimensions
    • 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
    • A61F2013/51059—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 being sprayed with chemicals
    • 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530131—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 absorbing medium being made in fibre but being not pulp
    • 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530481—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530489—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being randomly mixed in with other 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530481—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530569—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the particle size
    • 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530481—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/530583—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form
    • A61F2013/530613—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form in 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
    • A61F13/53—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 absorbing medium
    • A61F2013/530481—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
    • A61F2013/5307—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 absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the quantity or ratio of superabsorbent 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
    • A61F13/53—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 absorbing medium
    • A61F13/531—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 absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F2013/5312—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 absorbing medium having a homogeneous composition through the thickness of the pad with structure resisting compression
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53445—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 absorbing medium having an inhomogeneous composition through the thickness of the pad from several sheets
    • 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
    • A61F13/53—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 absorbing medium
    • A61F13/534—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 absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F2013/53791—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 absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer being resilient or elastic

Definitions

  • ABSORBENT ARTICLES The present invention relates to absorbent articles including integral disposable babies' diapers, adult incontinence pads and sanitary napkins containing absorbent polymer.
  • Integral disposable diapers and those other products generally consist of at least a water-impermeable backsheet, a layer of absorbent fluff, usually airfelt, and a topsheet which is water-permeable. Early designs of these products contained solely cellulosic fluff pulp as the absorbent. The fluid is held between the interstices/capillaries of the fibres.
  • the polymer can be placed in a layer between two wads of cellulosic fluff;
  • the polymer can be mixed randomly with the cellulosic fluff pulp to form a homogenous matrix
  • the polymer can be placed above the fluff but just below the top sheet or a combination of any of 1, 2 and 3.
  • Part of the function of the topsheet is to retain the other diaper components in position.
  • Some topsheets are formed from non-woven sheet material formed from hydrophobic fibres. The use of hydrophobic materials stops liquid being retained by the topsheet so that the baby's skin, which is in contact with the topsheet, can be kept dry. Although the use of hydrophobic topsheet does help in this regard, there is always a problem with "rewet” ie the tendency of liquid to be squeezed out from the fluff through the topsheet and onto the skin of the baby when there is pressure applied.
  • any cellulosic fluff immediately under the topsheet holds fluid between the fibres and this fluid can still be released under pressure through the cover sheet onto the skin.
  • the structure can pack down under pressure making it difficult for successive volumes of the fluid to penetrate.
  • the polymer is generally used in the form of particles. If the particles are small then they tend to fall out of the diaper through the interstices of the non-woven topsheet and may be deposited onto the skin of the baby which is undesirable.
  • a sanitary towel comprising a water-permeable topsheet with a resilient comfort layer lying immediately underneath the topsheet.
  • the absorbent core can contain ancilliary absorbent materials, eg cross-linked polyacrylate polymer particles.
  • the resilient layer can be formed of hydrophobic fibres.
  • absorbent polymer particles are incorporated into diapers in pockets.
  • the pocket can be positioned immediately underneath the water-permeable topsheet, which comprises conventional thin non-woven materials, for instance of cellulosic fibres or of hydrophobic fibres.
  • a new integral disposable absorbent product with improved rewet properties comprises in sequence a water-impermeable backsheet, a core comprising absorbent fluff, water-swellable, water-insoluble polymeric material and a water-permeable hydrophobic topsheet and is characterised in that the article comprises also a layer intermediate the topsheet and the core which comprises a sheet of a resilient water-permeable hydrophobic material having a thickness of at least 0.5mm.
  • the presence of the resilient layer means that large particles can no longer be sensed by the baby through the topsheet. Furthermore where the polymer is in the form of small particles the resilient layer provides a physical barrier preventing the particles from passing through the topsheet, for instance onto a user's skin. The resilient layer also reduces the direct pressure on polymer in the diaper which can reduce the packing dov/n and associated problems discussed above.
  • the absorbent article is usually for the absorbtion of bodily fluids including urine and menstrual fluid and so is usually a diaper, which term includes adult incontinence pads, or a sanitary towel.
  • the resilient layer may be present solely in a part of the crotch region where most of the liquid is absorbed, for instance it may be in the form of a transverse strip of material across that region.
  • a diaper may comprise a longitudinal strip of the material along the diaper centre.
  • the resilient layer preferably extends over the whole of the article.
  • the particles of polymer used in the preferred embodiment of the diaper may be small particles or large particles or a mixture.
  • Small particles may for instance comprise polymers particles having an average size (when dry) in the range up to 0.5mm or less, for instance up to 0.25mm.
  • Large particles may have average size (when dry) of at least 0.5mm, for instance they may have an average size of at least 1mm.
  • the polymer particles may be in the form of fibres.
  • the polymer particles are positioned immediately under the resilient layer and thus on the top of any other absorbent material such as airfelt (or other material) core. In this position there is a very great improvement in rewet properties provided by the combination of resilient layer and absorbent polymer that is on application of pressure on a wet product liquid is not squeezed back from the airfelt core on to the outside of the topsheet and from there into contact with the user's skin, as it would be in an embodiment wherein other absorbent material was provided between the polymer and resilient layer.
  • the polymer may be provided over part only of the article's surface area, eg solely in the crotch region, or may be spread across the whole area of the article.
  • the polymer may be formed of any of the materials described in EP-A-268,498 or EP-A-269 ,393. Other monomer mixtures may be used, for instance copolymers of maleic acid with an olefin such as isobutylene for instance cro ⁇ slinked through an external polyhydroxy crosslinker.
  • the polymer may be cationic, anionic or non-ionic.
  • the airfelt or fluff forming the bulk of the absorbent material in the diaper is of the usual type. It may comprise additional absorbent polymer, in the form of fibres, particles or as a sheet.
  • the resilient material must be water-permeable in order to allow passage of liquid waste through into the absorbent part of the diaper, ie into the absorbent polymer and the airfelt below.
  • the material is hydrophobic in order that it does not retain liquid but allows liquid to pass very easily through it.
  • the layer allows fluid to enter the diaper and spread into the core rapidly, thereby keeping the skin drier at the initial expulsion of liquid onto the article.
  • the resilient material is preferably formed of fibres although may be formed of hydrophobic open-cell sponge material.
  • a material formed of fibres is rendered resilient by the orientation of the fibres in the material such that they do not all lie in the plane of the web.
  • the resilient layer preferably is formed of a non-woven material, the fibres of which are preferably formed of polyester, polypropylene or polyethylene.
  • the material conveniently consists of a lofted non-woven material. By lofted we mean that the material as supplied for the diaper manufacturing process is in the form of a relatively thin non-woven material which, when i is heated, expands to form the thicker resilient sheet. Such materials are made originally as thick resilient powder-bonded non-woven sheets which are then calendered to form thinner sheets.
  • the heating process used in the manufacturing step allows the material to find its original, thicker and resilient form. Such material is particularly convenient to use from the manufacturers' point of view. It is provided as a thin material so can be supplied on rolls with adequate web length, and is then heated for the lofting during the manufacturing operation.
  • the resilient material is preferably at least 1mm thick and often is 2 to 3mm thick.
  • the layer may be integral with the topsheet ie permanently bonded to it, either before, eg during manufacture of the non-woven sheet, or during the diaper or other manufacturing process. Thus the resilient layer and non-woven topsheet could form a dual layer in the product.
  • the topsheet may be a thin layer of a non-woven material, for instance a hydrophobic material of the type used for disposable diapers in existing products.
  • the fibres in the topsheet in contrast to the material used in the resilient layer, lie mainly in the plane of the web.
  • it may comprise an apertured thermoplastic film, such as of embossed polyethylene.
  • film-type topsheets are more commonly used in sanitary napkins than diapers or incontinence pads.
  • the step of introducing the resilient layer into the product comprises unreeling a web of calendered non-woven material in unlofted form and then heating the material to loft it and form the resilient material which the said sheet is from.
  • the heating step is usually carried out prior to the material being placed in position in the product and is preferably carried out immediately before the material is introduced into the diaper. The heating could possibly be carried out after the material had been positioned and fixed into the diaper.
  • lofted non-woven material is particularly convenient since it allows the material as supplied to the manufacturer to be fairly thin, since otherwise if the material was supplied in the lofted, resilient form the length of material on a reel would be very short which would be inconvenient for manufacturing purposes.
  • the resilient material is thus held in place in the diaper either by virtue of it being sandwiched between the topsheet and the fluff, or it may be welded or bonded into position by adhesive for instance at its edges.
  • the other features of the product's construction are conventional eg the backsheet material, fastening devices, such as, adhesive tabs, elasticated leg side flaps, waistband etc.
  • Two test diapers of the invention were made up by dismantling a commercial product by removal of the topsheet (which was a thermally bonded polyester non-woven having a weight of 21 g per m 2 ) and tissue layer immediately under the topsheet, followed by sprinkling though a 180 x 90 mm template arranged over the centralised longitudinal area 4 gm of particulate polymer and then applying a dual layer topsheet in the usual topsheet's position.
  • Two products were formed, one (A) with a dual layer (ie laminated) topsheet of polyester non-woven material with a thin soft outer layer
  • Ultrasoft PlO/Ultraloft P28 (lofted) and the second (B) being similar but having a thicker resilient layer (50 g/m 2 ) (Ultrasoft PlO/Ultraloft
  • Repeat puddling time tests are carried out which give the time for successive aliquots of 60 ml synthetic urine applied at 20 minute intervals.
  • the wet back tests measure the amount of synthetic urine in grams which emerges back through the topsheet of a diaper under zero (1 g/cm 2 ) low (8 g/cm 2 ) and high (35 g/cm 2 ) load, from the original entry area over a period of 2 minutes, immediately after 60 mis of synthetic urine have penetrated into the diaper, measured by placing a wade absorbent pad over the topsheet.
  • repeat wet backs are tested after successive 60 ml aliquots are applied at 20 minute intervals.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
EP90908254A 1989-05-24 1990-05-24 Absorbierendes produkt Withdrawn EP0473660A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB898911958A GB8911958D0 (en) 1989-05-24 1989-05-24 Absorbent articles
GB8911958 1989-05-24
GB909006545A GB9006545D0 (en) 1990-03-23 1990-03-23 Absorbent articles
GB9006545 1990-03-23

Publications (1)

Publication Number Publication Date
EP0473660A1 true EP0473660A1 (de) 1992-03-11

Family

ID=26295392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90908254A Withdrawn EP0473660A1 (de) 1989-05-24 1990-05-24 Absorbierendes produkt

Country Status (4)

Country Link
EP (1) EP0473660A1 (de)
AU (1) AU637107B2 (de)
CA (1) CA2057070A1 (de)
WO (1) WO1990014061A1 (de)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69025944T2 (de) * 1990-12-04 1996-10-24 Kang Na Hsiung Enterprise Co L Material für absorbierende Polsterung
ZA92308B (en) 1991-09-11 1992-10-28 Kimberly Clark Co Thin absorbent article having rapid uptake of liquid
US5294478A (en) * 1992-12-18 1994-03-15 Kimberly-Clark Corporation Multi-layer absorbent composite
US5466513A (en) * 1992-12-18 1995-11-14 Kimberly-Clark Corporation Multi-layer absorbent composite
EP0682927B1 (de) * 1994-05-13 1999-07-28 The Procter & Gamble Company Schicht gegen den Verlust von absorbierenden Partikeln in absorbierenden Produkten
USH1698H (en) * 1994-10-21 1997-11-04 The Procter & Gamble Company Absorbent structures having thermally bonded resilient web for improved fit and comfort
AU703318B2 (en) * 1994-11-23 1999-03-25 Kimberly-Clark Worldwide, Inc. Absorbent article having a composite absorbent core
GB9508541D0 (en) * 1995-04-27 1995-06-14 Camelot Superabsorbents Ltd Absorbent article
US5858011A (en) * 1995-08-02 1999-01-12 The Procter & Gamble Company Disposable absorbent article having a resilient member
EP0963747A1 (de) * 1998-06-04 1999-12-15 The Procter & Gamble Company Absorbierender Wegwerfartikel mit einem Fäkalienmanagementelement
EP0976374A1 (de) 1998-07-29 2000-02-02 The Procter & Gamble Company Wegwerfbarer absorbierender Gegenstand mit einer Einrichtung zur Aufnahme von Fäkalien
EP0976373A1 (de) 1998-07-29 2000-02-02 The Procter & Gamble Company Wegwerfbarer absorbierender Gegenstand mit einer Einrichtung zur Aufnahme von Fäkalien
US6749593B1 (en) 1998-08-07 2004-06-15 The Procter & Gamble Company Disposable absorbent article comprising fecal management member having fibers oriented in the z-direction

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2373274A1 (fr) * 1976-12-08 1978-07-07 Oreal Article absorbant utilisable notamment comme serviette periodique
US4411660A (en) * 1981-12-24 1983-10-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Absorbent product and articles made therefrom
US4605402A (en) * 1984-08-17 1986-08-12 Personal Products Company Softening of a composite absorbent product
GB8722004D0 (en) * 1987-09-18 1987-10-28 Hercules Inc Absorbent material & thermally bonded cores
US4798603A (en) * 1987-10-16 1989-01-17 Kimberly-Clark Corporation Absorbent article having a hydrophobic transport layer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9014061A1 *

Also Published As

Publication number Publication date
CA2057070A1 (en) 1990-11-25
AU5733090A (en) 1990-12-18
WO1990014061A1 (en) 1990-11-29
AU637107B2 (en) 1993-05-20

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