EP0961605A1 - Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs - Google Patents

Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs

Info

Publication number
EP0961605A1
EP0961605A1 EP97952538A EP97952538A EP0961605A1 EP 0961605 A1 EP0961605 A1 EP 0961605A1 EP 97952538 A EP97952538 A EP 97952538A EP 97952538 A EP97952538 A EP 97952538A EP 0961605 A1 EP0961605 A1 EP 0961605A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
rad
odour control
absorbent article
frequency
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Withdrawn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
EP97952538A
Other languages
German (de)
English (en)
Inventor
Italo Corzani
Michael Divo
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
Priority claimed from EP96120742A external-priority patent/EP0850623A1/fr
Priority claimed from EP97110727A external-priority patent/EP0850624A1/fr
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to EP97952538A priority Critical patent/EP0961605A1/fr
Publication of EP0961605A1 publication Critical patent/EP0961605A1/fr
Withdrawn legal-status Critical Current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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
    • A61Q15/00—Anti-perspirants or body deodorants
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A61F13/47218—Sanitary towels, incontinence pads or napkins specially adapted for female use with a raised crotch region, e.g. hump
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A61F13/47218—Sanitary towels, incontinence pads or napkins specially adapted for female use with a raised crotch region, e.g. hump
    • A61F13/47227—Sanitary towels, incontinence pads or napkins specially adapted for female use with a raised crotch region, e.g. hump for interlabial use
    • 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
    • A61F13/45—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 shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A61F13/47263—Sanitary towels, incontinence pads or napkins specially adapted for female use with activating means, e.g. elastic, heat or chemical activatable means
    • 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
    • A61F13/56—Supporting or fastening means
    • A61F13/66—Garments, holders or supports not integral with absorbent pads
    • A61F13/82—Garments, holders or supports not integral with absorbent pads with means for attaching to the body
    • 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
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K8/00—Cosmetics or similar toiletry preparations
    • A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
    • A61K8/0208—Tissues; Wipes; Patches
    • 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
    • A61L15/58—Adhesives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • C09J153/025—Vinyl aromatic monomers and conjugated dienes modified
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials

Definitions

  • Disposable absorbent article for topical adhesive attachment to the skin of a wearer providing odour control
  • the present invention relates to disposable absorbent articles particularly sanitary napkins, pantiliners, adult incontinence products or sweat pads.
  • the present invention relates to such disposable absorbent articles which are worn by direct attachment to the skin of the wearer in the area were absorption of bodily liquids is desired and which articles are provided with an odour control system.
  • the present invention does not relate to wound covering absorbent articles but relates to absorbent articles for absorption of body liquids which naturally emanate from a body without a wound.
  • absorbent articles for absorption of body liquids which naturally emanate from a body without a wound.
  • sanitary napkins or pantiliners for use in the genital region are such articles.
  • incontinence devices which are worn e.g. in the genital region or sweat pads which are worn in the arm pit region of a person are the subject of the present invention.
  • These articles are used to discretely absorb liquids, which otherwise would usually adversely effect the social context of the user of such articles.
  • odour emanating from such articles could have the same negative effect or is at least often perceived as such.
  • WO 95/16424 includes a detailed analysis of the criteria for the body adhesive in respect to rheological criteria.
  • rheological criteria taught include epilatory, i.e. hair removal, compositions which are commercially available such as STREP MIELE (TM) sold in Italy by Laboratori Vaj S.p.A.
  • the adhesives for topical attachment mentioned in WO 95/16424 include also today's pressure sensitive adhesives which are used to attach sanitary napkins to undergarments. Further, this document only identifies static rheological characteristics but is silent as to the dynamic rheological behaviour of a body adhesive.
  • WO 96/13238 a frequency dependent body adhesive model is disclosed. However, all measurements disclosed, e.g. on page 9, were made at temperatures between -60°C and +120°C and at actual frequencies of 0.1 to 100 rad/s. In order to obtain the necessary data at application temperature (about 20°C, typical bath room, i.e. storage temperature) the Williams-Landel-Ferry (hereinafter WLF) equation was used.
  • WLF Williams-Landel-Ferry
  • This WLF equation is empirical and only valid within certain limits e.g. it cannot be used to extrapolate to temperatures below the glass transition temperature of a polymeric adhesive also the WLF cannot be used on the basis of values obtained below the glass transition temperature. Details about the WLF equation and its applicability can be found in "Principles of Polymer processing" by Z. Tadmor and CG. Gogos, published by John Wiley & Sons or in "Viscoelastic Properties of Polymers" by J.D. Ferry also published by John Wiley & Son. Since this is already missing from WO 96/13238 the applicability of the disclosed data cannot be assessed. Further this disclosure does not relate to absorbent articles provided with an odour control means.
  • European Patent Application EP-638 303 discloses the use of a body adhesive on side cuffs of sanitary napkins in order to keep the cuffs in an upright position.
  • Swiss publication CH-643730 discloses the use of a very long sanitary napkin having chamfered outer edges with a body adhesive at the four corners of the outer edges in order to provide a body adhesive area well outside the region of public hair growth.
  • the present invention relates to disposable absorbent articles for topical adhesive attachment to a wearer of such articles which comprise an odour control system.
  • the article typically has a wearer facing surface and an outside surface also called garment facing surface in the context of articles worn underneath clothing.
  • the article comprises an absorbent core structure between the wearer facing surface and the garment facing surface for absorbing liquids naturally emanating from a wearer.
  • the disposable absorbent article according to the present invention comprises on at least part of the wearer facing surface an adhesive for topical adhesive attachment of the article to the skin of the wearer and further the article comprises an odour control system to provide an odour control benefit.
  • the absorbent core comprises the odour control system and preferably the odour control system comprises particulate odour control agents. It is most preferred that the particulate odour control agents are particles selected from zeolites, absorbent gelling materials, activated carbon, silicas, and combinations thereof.
  • the garment facing side of the absorbent article is provided by a backsheet which usually should be liquid impervious and in this preferred embodiment is at least water vapour permeable in order to provide breathability to the absorbent article.
  • a backsheet which usually should be liquid impervious and in this preferred embodiment is at least water vapour permeable in order to provide breathability to the absorbent article.
  • the adhesive is particularly characterised by having an elastic modulus at a temperature of 37°C (100° Fahrenheit) abbreviated G'37 and having a viscous modulus at a temperature of 37°C (100° Fahrenheit) of G"37.
  • the adhesive is selected to have a dynamic elastic behaviour such that the difference _ G'37 of G'37 a a frequency of 100 rad/sec and G'37 a a frequency of 1 rad/sec is not greater than 150 %, preferably 80 %, of G'37 at 1 rad/sec or preferably less than 10000 Pa.
  • the adhesive further is selected to have a dynamic viscous behaviour such that the difference _ G"37 of G"37 at a frequency of 100 rad/sec and G"37 at a frequency of 1 rad/sec is not greater than 10000 Pa, preferably not greater than 5000 Pa, most preferably not greater than 1000 Pa.
  • the articles according to the present invention have a value of the ratio G'37 over G"37 in the whole frequency range from 1 to 100 rad/sec of greater or equal to 1 , preferably greater or equal to 1.6 and most preferably greater or equal to 3.3.
  • the value of the ratio G'37 over G"37 at least for the frequency range 1 to 100 rad/sec can change with increasing frequency, while not necessarily being proportional to the frequency change.
  • This ratio of G'37 over G"37 should not change within the frequency range by a factor of more than 3, preferably more than 2, and most preferably should stay constant.
  • G'37 is below 20000 Pa, preferably below 15000 Pa and most preferably even less than 10000 Pa.
  • the value of G" 37 at a frequency of 1 rad/sec should not exceed 15000 Pa, it should preferably be less than 10000 Pa and most preferably even less than 5000 Pa.
  • compositions where the composition comprises from 51 % to 99.5 % of a plasticising compound or composition which is liquid at 20°C, from 0.5 to 20 %, preferably 5 % to 15 %, of a polymeric compound or composition which is soluble or swellable in the plasticising compound or composition and with a tackifying resin in an amount in the range from 0 % to 600 % by weight of the polymeric compound.
  • the plasticising compound or composition is preferably selected from the group consisting of water, alcohols, preferably glycerol, glycols, polyglycols, liquid polybutenes, oil or combinations thereof while the polymeric compound or composition is preferably selected from the group consisting of block-copolymer- thermoplastic-elastomers, styrene-block-copolymers and hydrogenated styrene- block-copolymers.
  • the preferred body adhesive is at least partially hydrophobic, preferably 60 %, more preferably 80 %, by weight of the adhesive consist of hydrophobic components and most preferably none of the materials in the adhesive are hydrophilic, i.e. it is made totally from hydrophobic components.
  • the adhesive covers less than 20 % or even more preferably less than 10 % of the wearer facing surface of the absorbent article.
  • the present invention is most beneficially applied in the field of sanitary napkins or pantiliners.
  • This invention relates to disposable absorbent articles which are applied directly to the skin of a user.
  • the article exhibits absorbency for bodily fluids, the protection of the user's garments from soiling, an odour control benefit, improved physical comfort to the user, and is easy to produce and to package.
  • the disposable absorbent article is described below by reference to a sanitary napkin or catamenial, however panty liners, adult incontinence articles or sweat pads are also included under the term disposable absorbent articles.
  • sanitary napkin refers to an article which is worn by females adjacent to the pudendal region and which is intended to absorb and contain the various body fluids which are discharged from the body (e.g., vaginal discharges, menses, and/or urine) and which is intended to be discarded after a single use.
  • the disposable absorbent article is preferably thin, more preferably between 1 and 5 mm thick and either substantially flat prior to use or in a preshaped form.
  • joind or "affixed”, as used herein, encompasses configurations whereby a first member is directly connected to a second member and configurations whereby a first member is indirectly connected to a second member by connecting the first member to intermediate members which in turn are connected to the second member.
  • a sanitary napkin of the present invention comprises a liquid pervious topsheet, a liquid impervious backsheet joined to the topsheet, and an absorbent core intermediate the topsheet and the backsheet.
  • the sanitary napkin has two main surfaces, a body contacting or wearer facing surface, and a garment facing or contacting surface.
  • the topsheet is compliant, soft feeling, and non-irritating to the wearer's skin.
  • the topsheet also can have elastic characteristics allowing it to be stretched in one or two directions in portions of the topsheet or throughout its extension. Further, the topsheet is fluid pervious permitting fluids (e.g., menses and/or urine) to readily penetrate through its thickness.
  • a suitable topsheet can be manufactured from a wide range of materials such as woven and non woven materials; polymeric materials such as apertured formed thermoplastic films, apertured plastic films, and hydroformed thermoplastic films; and thermoplastic scrims.
  • Suitable woven and non woven materials can be comprised of natural fibers (e.g., wood or cotton fibers), . synthetic fibers (e.g., polymeric fibers such as polyester, polypropylene, or polyethylene fibers) or from a combination of natural and synthetic fibers or bi-/multi-component fibers.
  • Preferred topsheets for use in the present invention are typically selected from high loft nonwoven topsheets and apertured formed film topsheets.
  • Apertured formed films are especially preferred for the topsheets because they are pervious to body exudates and yet non absorbent and have a reduced tendency to allow fluids to pass back through and rewet the wearer's skin.
  • the surface of the formed film that is in contact with the wearer remains dry, thereby reducing body soiling and creating a more comfortable feel for the wearer.
  • micro apertured formed film topsheets are disclosed in U.S. patent 4,609,518 and U.S. patent 4,629,643.
  • a preferred topsheet for the present invention comprises the formed film described in one or more of the above patents and marketed on sanitary napkins by The Procter & Gamble Company of Cincinnati, Ohio as "DRI-WEAVE".
  • Topsheets having not a homogeneous distribution of liquid passage ways but only a portion of the topsheet comprising liquid passage ways are also contemplated by the present invention. Typically such topsheets would have the liquid passage ways oriented such that they result in a centrally permeable and peripherally impermeable topsheet for liquids.
  • the wearer facing surface of the formed film topsheet can be hydrophilic so as to help liquid to transfer though the topsheet faster than if the body surface was not hydrophilic.
  • surfactant is incorporated into the polymeric materials of the formed film topsheet such as is described in PCT- publication WO 93/09741.
  • the wearer facing surface of the topsheet can be made hydrophilic by treating it with a surfactant such as is described in U.S. 4,950,254.
  • hybrid topsheets which incorporate fibrous and film like structures particularly useful embodiments of such hybrid topsheets are disclosed in PCT publications WO 93/09744; WO 93/11725 or WO 93/11726.
  • topsheet When referring to the topsheet a multi layer structure or a mono layer structure is contemplated.
  • the hybrid topsheet mentioned above is such a multi layer design but other multi layer topsheets such as primary and secondary topsheet designs are also considered.
  • the odour control system according to the present invention can also be provided to or with the topsheet.
  • the odour control system comprises odour masking agents (such as perfumes) these agents can be e.g. sprayed onto a surface of the topsheet.
  • microencapsulated odour control agents which are protected against premature exhaustion can be provided on or with the topsheet.
  • the microcapsules depending on their activation mode e.g. fracture or heat or dissolving then have a high probability of activation just when they are needed. However, it is usually preferred to provide the odour control system with the absorbent core.
  • the absorbent structure or absorbent core can include the following components: (a) optionally a primary fluid distribution layer preferably together with a secondary optional fluid distribution layer; (b) a fluid storage layer; (c) optionally a fibrous ("dusting") layer underlying the storage layer; and (d) other optional components.
  • One optional component of the absorbent structure 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 which maintain the capillaries between fibers even when wet are useful as distribution layers.
  • the fluid storage layer can comprise any usual absorbent material or combinations thereof. It preferably comprises absorbent gelling materials usually referred to as "hydrogel”, “superabsorbent”, hydrocolloid” materials in combination with suitable carriers.
  • the absorbent gelling materials are capable of absorbing large quantities of aqueous body fluids, and are further capable of retaining such absorbed fluids under moderate pressures.
  • the absorbent gelling materials can be dispersed homogeneously or non-homogeneously in a suitable carrier.
  • the suitable carriers provided they are absorbent as such, can also be used alone.
  • Suitable absorbent gelling materials for use herein will most often comprise a substantially water-insoluble, slightly cross-linked, partially neutralised, polymeric gelling material. This material forms a hydrogel upon contact with water
  • polymer materials can be prepared form polymerizable, unsaturated, acid- containing monomers which are well known in the art.
  • 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/panty liners.
  • An embodiment of the absorbent structure made according to the present invention comprises a double layer tissue laminate formed by folding the tissue onto itself. These layers can be joined to each other. 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.
  • An optional component for inclusion in the absorbent structure 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 structure. Indeed, in those instances where the absorbent gelling material is in the form of macro structures such as fibers, sheets or strips, this fibrous "dusting" layer need not be included. However, this "dusting" layer provides some additional fluid-handling capabilities such as rapid wicking of fluid along the length of the pad.
  • the absorbent structure 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 structure.
  • 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 absorbent article comprises as an essential feature an odour control system.
  • Any odour control agent or combinations thereof, known in the art for this purpose may be used herein.
  • the art is replete with descriptions of various odour controlling agents for use in absorbent articles in order to address the problem of malodour formation which may all be usefully employed in the present invention. These agents can typically be classified according to the type of odour the agent is intended to combat. Odours may be chemically classified as being acidic, basic or neutral.
  • Acidic odour controlling agents have a pH greater than 7 and typically include sodium carbonates, sodium bicarbonates, sodium phosphates, particularly zinc and copper sulphates.
  • Basic odour controlling agents have a pH of less than 7 and include compounds such as carboxylic acids such as citric acid, laric acid, boric acid, adipic 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, absorbent gelling materials (AGM), and starches. Neutral odour control agents and systems are disclosed for example in EPO 348 978, EPO 510 619, WO 91/12029, WO 91/11977, WO 91/12030, WO 81/01643 and WO96/06589. Also cyclodextrin and derivatives thereof may be used as described in US 5429628.
  • the odour control systems may be categorised with respect to the mechanism by which the malodor detection is reduced or prevented.
  • the above odour control agents typically control odour detection by an absorptive mechanism.
  • Suitable agents include chelating agents and may be selected from amino carboxylates such as for example ethylenediamine- tetracetate, as described for example in US 4356190, amino phosphonates such as ethylenediaminetetrakis (methylene- phosphonates), polyfunctionally-substituted aromatic chelating agents as described in US 3 812 044 and mixtures thereof. Without intending to be bound by theory it is believed that the benefit of these materials is in part due to their exceptional ability to remove iron, copper, calcium, magnesium and manganese ions present in the absorbed fluids and their degradation products by the formation of chelates.
  • Another suitable odour control system for use herein comprises a buffer system, such as citric acid and sodium bicarbonate, sodium phosphate and sorbic acid buffer systems. Also, buffer systems having a pH of from 7 to 10 as described for example in WO94/25077 may be useful herein.
  • An alternative odour control system utilises ion exchange resins such as those described in US 4 289 513 and US 3340875.
  • Masking agents such as perfumes may also be used as odour control agents herein.
  • these agents are used in combination with an additional odour control agent such as zeolite as described in WO94/22500.
  • additional odour control agent such as zeolite as described in WO94/22500.
  • masking agents in the odour control system can be provided in encapsulated, preferably microencapsulated form which provides the additional benefit of not adversely effecting the ability of the article to be "schmiegsam" (which can be translated into lithe or pliable in English), as defined in EP-A-333 773.
  • Preferred odour control systems for use herein include the following combinations: i) silica, AGM and zeolites, preferably in a ratio of from 5:1 :1 to 1 :1 :5 most preferably 3:1 :1 to 1 :1 :3; ii) zeolites, activated carbon and AGM; iii) silica and AGM preferably in a ratio of from 5:1 to 1 :5, more preferably from 3:1 to 1 :3; iv) zeolites and AGM; v) silica and zeolites, preferably in a ratio of from 1 :5 to 5:1 , more preferably from 1 :3 to 3:1 ; vi) chelating agents, particularly ethylenediamine- tetracetate; and vii) chelating agents in combination with either odour control system i) to v) preferably in a ratio of from 1 :10 to 10:1 , more preferably from 1 :5 to 5:1
  • the amount of odour control system incorporated into the absorbent article may be readily determined by the man skilled in the art and is also dependent on the intended use of the absorbent article, bearing in mind the absorbent article dimensions.
  • the absorbent article comprises from 5gm"2 to 400gr ⁇ r2, more preferably from 100gm-2 to 300gm-2, most preferably from 150gm -2 to 250gm _ 2 basis weight of said odour control system.
  • a sanitary napkin or panty liner may comprise from 0.25g to 5g, preferably from 0.4g to 3g, most preferably from 0.5g to 2.5g of said odour control system.
  • the odour control system may be incorporated into the article by any of the methods disclosed in the art, provided that the absorbent article elements and the absorbent article itself meets the specified requirement described herein.
  • the odour control agents may be layered on the core of the absorbent material or mixed within the fibres of the absorbent core.
  • the odour control system is preferably incorporated between two layers of cellulose tissue in the fluid storage layer.
  • the odour control system can be bonded between two cellulose tissue layers with for example a hot melt adhesive, a polyethylene particle binder or any other suitable bonding system.
  • the backsheet primarily prevents the exudates 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.
  • liquids e.g. menses and/or urine
  • 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 onto and form part of the topsheet by folding around the absorbent structure.
  • a topsheet configuration as disclosed in US 4,342,314, column 16, lines 47 - 62 can be achieved without the requirement to selectively aperture the topsheet.
  • 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 P18-1401 and by Ethyl Corporation, Visqueen Division, of Terre Haute, Indiana, under the designation XP-39385.
  • the backsheet is preferably embossed and/or matte finished to provide a more clothlike appearance.
  • the backsheet also provides breathability to the absorbent article by being at least water vapour permeable, preferably air permeable, however, without compromising the main function of the backsheet.
  • the backsheet can be a laminate material e.g. of a combination of microporous film, non-woven material, and/or apertured formed film. Breathability if desired can be limited to the periphery of the backsheet or it can be across the whole backsheet.
  • the backsheet can be a microporous film comprising as inert filler a suitable odour control material to create the microporous structure upon stretching while also providing a malodour barrier.
  • sanitary napkins are applied in the genital region of a typically female user around the area of liquid discharge.
  • the word "skin" according to the present invention does not only relate to the specific derma of the user but include the mucous tissue as well as the hair which is typically found in the genital region of users of sanitary napkins.
  • the body adhesive is provided along the peripheral edge of the topsheet such that a central area of the article is left without adhesive. This will most appropriately facilitate placing the article such that the liquid permeable topsheet without adhesive on it is placed adjacent the bodily liquid emanating orifice such that emanating liquid is immediately transported into the absorbent structure of the absorbent article without the possibility of leakage or spillage.
  • the body adhesive is provided in a closed circle around the periphery of the topsheet but it can be provided in incremental areas such as dots or discrete lines such that decoupling between the different places of attachment is providing additional comfort to the wearer of such articles.
  • PSA typical pressure sensitive adhesive
  • this can be interpreted as meaning that a high fraction of the energy applied for the debonding is dissipated in internal frictions (so it is not effective in causing the debonding) while this fact causes macroscopically the recording of a very high level of adhesive force.
  • the absolute values of the elastic modulus should not be too high, otherwise the adhesive is too hard and it is not able to intimately join or mold to the surface to which it is expected to adhere. It is also important to have a low absolute value of G" in order to have good cohesion which is particularly valuable for a direct application on the human body while the material remains soft and capable of gently adhering to the skin.
  • materials useful as body adhesives according to the present invention have rheological characteristics which are measured at a reference temperature of 37°C as body temperature and in a range of frequencies. It has been found that upon application of an article with a body adhesive the adhesive contact is formed at a low frequency, while debonding happens at the speed of removing the article. This speed is expressed as a frequency of 100 rad/s while the low frequency of forming the adhesive bond has been found to be on the order of 1 rad/s. Therefore, the frequency range for use according to the present invention is between 1 and 100 rad/s. The following set of characteristics should be satisfied:
  • the percent variation of the elastic modulus G'37 is lower or equal to 150 %, preferably lower than 100 % and more preferably lower than 80 %, of G'37 at 1 rad/s, preferably the variation is less than 10000 Pa in absolute terms.
  • the body adhesive exemplified below while e.g. Promeon RG-63B, quoted in the prior art, shows in the same range of frequencies a variation of G'37 of 331 % which is not acceptable according to the present invention.
  • the percent variation of the viscous modulus G"37 is not greater than 10000 Pa, preferably not greater than 5000 Pa, most preferably not greater than 1000 Pa.
  • the value of the ratio G'37/G"37 at least for the frequency range 1 rad/s to 100 rad/s should preferably be unity or above, more preferably 1.6 or above and most preferably 3.3 or above, while preferably not exceeding about 50.
  • G' and G" at the application frequency of 1 rad/s are taken at a temperature of 37°C.
  • the actual storage temperature of the article and hence the temperature of the body adhesive upon application varies widely.
  • storage in a hot bathroom near a radiator could reach up to about 37°C
  • storage in a storage room or in a bathroom without heating but with an open window during winter could be close to 0°C.
  • the article according to the present invention is used directly on skin and the wearer typically would not want to apply a too cold article the actual temperature of the body adhesive will reach 37°C very quickly or even be warmed up by the wearer prior to application.
  • the adhesive bonding characteristics are selected most appropriately at body temperature.
  • Tg Glass Transition Temperature
  • Tg should preferably be less than -15°C, more preferably less than -20°C and most preferably less than -25°C.
  • compositions useful as body adhesive have a substantially gel-like structure and are preferably gels. This derives from the fact that:
  • the prevailing component is a material liquid at room temperature
  • a macromolecular or polymeric component is present in minor quantities vs the plasticiser. It forms, in the preferred embodiments, a three dimensional network caused by physical or chemical links between the molecules. Particularly useful physical links are the ones present in systems containing Block Thermoplastic Elastomers.
  • compositions comprise:
  • macromolecular or polymeric substances can be natural and/or synthetic such as natural gums or derivatives such as natural gums and gelatines, their derivatives and alginates; polyacrilics; polyvinyl alcohol; polyethylene oxide; polyvinylpyrrolidon (PVP) or polyvinylethers, their copolymers and derivatives; cellulose derivatives; Block Copolymer Thermoplastic Elastomers and preferably Styrenic Block Copolymers and more preferably the hydrogenated grades Styrol/Ethylene-Butylene/Styrol (SEBS), Styrene/lsoprene/Styrene (SIS), and Styrol/Ethylene-Propylene/Styrol (SEPS).
  • SEBS Styrol/Ethylene-Butylene/Styrol
  • SIS Styrene/lsoprene/Styrene
  • SEPS Styrol/Ethylene-Propylene/Styrol
  • plasticising substance or a mixture of plasticising substances, which are liquid at room temperature.
  • the plasticiser can be water, various alcohols (like in particular glycerol), glycols, polyglycols, liquid polybutenes, natural or synthetic oils such as vegetable oils, mineral oils, or combinations thereof.
  • hydrophilic or hydrophobic liquid plasticisers may be for oily systems, e.g. the fatty acids of C 8 to C 22 , their metallic salts and their polyoxo-derivatives; lanolin derivatives; silica; bentonite, montmorillonite and their derivatives; polyamides, waxes or mixtures thereof.
  • crosslinking agent can be present preferably in quantities up to 5 % by weight.
  • Chemical crosslinking can be formed also by mutual neutralisation of polymers having different functionalities as in the reaction between acid polyacrylics and polysaccharides.
  • compositions for body adhesives can be divided into three families according to the nature of the main component, i.e. the liquid plasticiser(s):
  • Hydrophilic compositions in which typically the plasticiser is water/glycerol/glycols and the like and/or mixtures thereof and the polymeric phase is of synthetic (e.g. polyacrilics) or natural (e.g. natural gums) origin or mixtures thereof.
  • hydrophilic compositions are not preferred while the hydrophobic and mixed phases compositions 1) and 2) are preferred in the applications of the present invention.
  • hydrophilic compositions used in the medical field show too low elastic character and cohesion for being useful in the present application.
  • the other reason to prefer hydrophobic or mixed phase compositions is that the application of the present invention in particular in the sanitary napkin field will include a probability of contacting the body adhesive with the liquid to be absorbed. Since the liquid to be absorbed are all of a general aqueous kind contact with a hydrophilic body adhesive would result in a certain absorption of the bodily liquids into the body adhesives.
  • hydrophilic body adhesive also tend to be perceived as cold and wet which upon application of a fresh sanitary napkin or an underarm sweat pad is not in line with typical consumer expectation. Additional problems result from the fact that in particular body adhesives comprising water as the plasticiser have a tendency to dry out unless they are sealed into an impermeable package.
  • Absorbent articles according to the present invention can be made by any of the ways usual in the art.
  • the application of the adhesive to the topsheet side of the absorbent article should not cause major problems to those skilled in the art since it can be provided by similar techniques as is commonly used for a panty fastening adhesive.
  • the total area of the wearer facing surface of the absorbent article which is covered by body adhesive should be not more than 20 %, preferably not more than 10 %.
  • the adhesive is close to the periphery of the absorbent article and in the case of film topsheets (or when the backsheet is folded onto the topsheet) the adhesive is preferably on a portion of the film which is not permeable to liquids.
  • the body adhesive on the article (as is common with panty fastening adhesives) needs to be protected prior to use.
  • This protection can be provided by a release liner such as a siliconised or surfactant treated paper, provided this paper is a good release surface for the particularly selected body adhesive.
  • the absorbent article according to the present invention is supported on the wearer by the body adhesive and does not require additional support to remain in place.
  • the body adhesive it is possible to provide for example a sanitary napkin with a skid resistant coating on the backsheet side in order to prevent the sanitary napkin form gradually migrating out of position.
  • panty fastening adhesives are not desired and hence not preferred according to the present invention they are not strictly speaking excluded in the context of the present invention.
  • An oil based composition useful in the present invention was compounded using 9.9 % by weight of Kraton G-1651 , a Styrene/Ethylene-Butylene/Styrene block copolymer containing 33% by weight styrene and available from Shell Co, and 59.3 % by weight of Kaydol, a paraffinic mineral oil available from Witco Co.
  • composition contained 301 parts of tackifying resin per 100 parts of Kraton polymer.
  • the tackifying resin was Escorez 5300, a hydrogenated resin available from Exxon Co.
  • Magnesium Stearate available from Carlo Erba S.p.A., was used a a co-gelifying agent for oil at a level of 0.7 % by weight.
  • Irganox 1010 an antioxidant available from Ciba-Geigy, was added at a level of 0.3 % by weight.
  • the composition showed the following rheological properties at 37°C.
  • COMPARATIVE EXAMPLE A componotine oil based composition was compounded using 7.1 % by weight of Kraton G-1651 , a Styrene/Ethylene-Butylene/Styrene block copolymer containing 33% by weight styrene and available from Shell Co, and 41.9 % by weight of Kaydol, a paraffinic mineral oil available from Witco Co.
  • composition contained 704 parts of tackifying resin per 100 parts of Kraton polymer.
  • the tackifying resin was Regalrez 3102, a hydrocarbon resin available from Hercules Co.
  • Magnesium Stearate available from Carlo Erba S.p.A., was used a a co-gelifying agent for oil at a level of 0.7 % by weight.
  • Irganox 1010 an antioxidant available from Ciba-Geigy, was added at a level of 0.3 % by weight.
  • the composition showed the following rheological properties at 37°C.

Abstract

La présente invention concerne des articles absorbants jetables, en particulier des serviettes hygiéniques, protège-slips, protections contre l'incontinence pour adultes et coussinets absorbants. La présente invention se rapporte notamment à des articles absorbants jetables qui peuvent être directement fixés sur la peau de l'utilisateur dans la région où les liquides corporels doivent être absorbés et qui sont munis d'un système d'élimination des odeurs.
EP97952538A 1996-12-23 1997-12-22 Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs Withdrawn EP0961605A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97952538A EP0961605A1 (fr) 1996-12-23 1997-12-22 Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
EP96120742A EP0850623A1 (fr) 1996-12-23 1996-12-23 Article absorbant jetable pourvu d'un adhésive pour la fixation d'article sur la peau avec matériau pour le contrÔle des odeurs
EP96120742 1996-12-23
EP97110727 1997-07-01
EP97110727A EP0850624A1 (fr) 1996-12-23 1997-07-01 Article absorbant jetable pourvu d'un adhesif pour la fixation d'article sur la peau
EP97952538A EP0961605A1 (fr) 1996-12-23 1997-12-22 Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs
PCT/US1997/023454 WO1998027912A1 (fr) 1996-12-23 1997-12-22 Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs

Publications (1)

Publication Number Publication Date
EP0961605A1 true EP0961605A1 (fr) 1999-12-08

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EP97952538A Withdrawn EP0961605A1 (fr) 1996-12-23 1997-12-22 Article absorbant jetable pouvant se fixer par adhesion topique sur la peau de l'utilisateur et eliminer les odeurs

Country Status (7)

Country Link
EP (1) EP0961605A1 (fr)
JP (1) JP2000505699A (fr)
KR (1) KR20000069675A (fr)
AU (1) AU5612398A (fr)
BR (1) BR9714841A (fr)
CA (1) CA2275754A1 (fr)
WO (1) WO1998027912A1 (fr)

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US6620143B1 (en) 1994-10-28 2003-09-16 Kimberly-Clark Worldwide, Inc. Sanitary napkin article having body-facing adhesive
US6533765B1 (en) * 1998-05-01 2003-03-18 The Procter & Gamble Company Absorbent articles having a lotion resistant adhesive
US6716204B1 (en) 1998-10-28 2004-04-06 The Procter & Gamble Company Absorbent article with improved feces containment characteristics
US6489534B1 (en) 2000-04-28 2002-12-03 Kimberly-Clark Worldwide, Inc. Disposable personal articles which conform and adhere
US7312167B2 (en) * 2002-12-23 2007-12-25 Kimberly-Clark Worldwide, Inc. Breathable multilayer films for use in absorbent articles
US7947027B2 (en) 2007-12-28 2011-05-24 Kimberly-Clark Worldwide, Inc. Body adhering absorbent article
US8292862B2 (en) 2007-08-03 2012-10-23 Kimberly-Clark Worldwide, Inc. Dynamic fitting body adhering absorbent article
US8251969B2 (en) 2007-08-03 2012-08-28 Kimberly-Clark Worldwide, Inc. Body adhering absorbent article
US8672911B2 (en) 2007-08-03 2014-03-18 Kimberly-Clark Worldwide, Inc. Body adhering absorbent article
US8734413B2 (en) 2007-08-03 2014-05-27 Kimberly-Clark Worldwide, Inc. Packaged body adhering absorbent article
KR101008171B1 (ko) * 2008-05-26 2011-01-13 양웅섭 방귀소리와 방귀냄새를 감쇠하는 항문부착용 패드
US11147722B2 (en) 2008-11-10 2021-10-19 Kimberly-Clark Worldwide, Inc. Absorbent article with a multifunctional acrylate skin-adhesive composition
US10022468B2 (en) 2009-02-02 2018-07-17 Kimberly-Clark Worldwide, Inc. Absorbent articles containing a multifunctional gel
US8758547B2 (en) 2011-02-08 2014-06-24 Kimberly-Clark Worldwide, Inc. Method of manufacturing a body adhering absorbent article orientated in the cross-machine direction with reduced curl
US8764922B2 (en) 2011-02-08 2014-07-01 Kimberly-Clark Worldwide, Inc. Method of manufacturing a body adhering absorbent article orientated in the machine direction with reduced curl
EP3386457A1 (fr) 2015-12-10 2018-10-17 The Procter and Gamble Company Article comprenant une composition désodorisante

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Also Published As

Publication number Publication date
WO1998027912A1 (fr) 1998-07-02
AU5612398A (en) 1998-07-17
CA2275754A1 (fr) 1998-07-02
KR20000069675A (ko) 2000-11-25
JP2000505699A (ja) 2000-05-16
BR9714841A (pt) 2000-08-01

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