WO2004084783A1 - Article absorbant comprenant une structure absorbante - Google Patents

Article absorbant comprenant une structure absorbante Download PDF

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Publication number
WO2004084783A1
WO2004084783A1 PCT/SE2004/000354 SE2004000354W WO2004084783A1 WO 2004084783 A1 WO2004084783 A1 WO 2004084783A1 SE 2004000354 W SE2004000354 W SE 2004000354W WO 2004084783 A1 WO2004084783 A1 WO 2004084783A1
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WO
WIPO (PCT)
Prior art keywords
absorbent
super absorbent
liquid
porous structure
storage layer
Prior art date
Application number
PCT/SE2004/000354
Other languages
English (en)
Inventor
Charlotta Hansson
Ted Guidotti
Eje Österdahl
Anna BAGGER-SJÖBÄCK
Original Assignee
Sca Hygiene Products Ab
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 Sca Hygiene Products Ab filed Critical Sca Hygiene Products Ab
Publication of WO2004084783A1 publication Critical patent/WO2004084783A1/fr

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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
    • 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
    • A61F13/535—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 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • 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
    • A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
    • 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
    • A61F2013/15357—Stiffness, e.g. Taber rigidity
    • 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
    • A61F2013/15422—Density
    • 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
    • A61F2013/530649—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 sponge or foam

Definitions

  • Absorbent article comprising an absorbent structure
  • the present invention relates to an absorbent article such as a diaper, an incontinence guard, a sanitary napkin or the like, whereby the article exhibits a liquid permeable upper surface and an opposite at least substantially liquid impermeable surface and comprising an absorbent structure.
  • Absorbent structures for absorbent articles such as diapers, incontinence guards, sanitary napkins, intended for one single use, are usually constructed by one ore more layers of hydrophilic fibres, for example cellulosic fluff pulp.
  • a super absorbent material is comprised in such structure, said superabsorbent materials being polymers having the ability to absorb water or bodily fluids many times their own weight.
  • the absorbent structure may comprise other components, for example to improve its liquid distribution capacity or increase its ability to keep the structure together and ability to resist deformation during use.
  • an article has been provided, which is thin and discrete to wear, and at the same time the article exhibits sufficient liquid acquiring capacity, liquid distribution capacity and liquid storage capacity.
  • An absorbent article according to the invention is characterised mainly in that the absorbent structure comprising a super absorbent porous structure exhibiting a Gurley stiffness value being lower than 1000 mg and a density in a dry condition exceeding 0.5 g/cm 3 .
  • the dry density value relates to the density the super absorbent porous structure exhibits in the absorbent article upon storage of absorbent articles in a sealed diaper package.
  • the term "diaper package” denotes the package, in which the diapers are enclosed when selling the diapers. In some cases, the diapers are packed one by one, whereby a number of single- wrapped diapers then are further enclosed in a bigger package. Therefore, the term “diaper package” does not denote a single-wrapped diaper but the bigger diaper package.
  • the density of the structure is referred to as the exhibited density in the absorbent structure comprised in said articles within a sealed package for incontinence guards or sanitary napkins. Measurements of the density of the fragments must be made within 2 minutes after opening the package in question. The density should be measured at a load against the material being 0.5 kPa.
  • the density is first measured on the super absorbent porous structure and the material being attached to the super absorbent porous structure. This measurement is performed within 2 minutes from the opening of the package. Thereafter the attached material is removed from the super absorbent porous structure, whereby the density is measured on the attached material. Thus, the density of the super absorbent porous structure can be calculated.
  • a super absorbent foam material according to the invention is at least upon storage in the diaper package thin and compressed.
  • such a super absorbent porous structure is also thin and compressed upon usage of the absorbent article comprising the super absorbent porous structure.
  • such a super absorbent porous structure also upon usage has a density in a dry condition exceeding 0.5 g/cm 3 .
  • Such a super absorbent foam material expands heavily upon contact with water. Upon the expansion, the free volume of the material is increased, leading to that such a super absorbent material can receive a large amount of liquid during a short period of time.
  • the super absorbent porous structure constitutes the acquisition portion comprised in the absorbent structure.
  • acquisition portion denotes firstly, the layer receiving the liquid (i.e., the acquisition layer) and secondly, the layer absorbing the liquid from a first inlet layer and then intermediary store the liquid (i.e., an intermediate storage layer) before the liquid eventually is being stored in the final storage portion.
  • the super absorbent porous structure is a polyacrylate- based foam material.
  • a polyacrylate-based foam material is produced by the saturation under pressure using carbon dioxide of a solution, which at least contains monomer, a cross-linking material, an initiator and a tenside in a vessel during stirring.
  • a solution which at least contains monomer, a cross-linking material, an initiator and a tenside in a vessel during stirring.
  • the solution is removed from the vessel through a nozzle, the solution is expanded and a foamed structure is achieved.
  • the foamed structure is then locked in that polymerisation and cross-linking are initiated by for instance UV radiation and/or e-beam. Finally, the material is compressed and dried.
  • the super absorbent porous structure exhibits a density in a dry condition exceeding 0.7 g/cm 3 .
  • the dry density value relates to the density exhibited by the super absorbent porous structure in the absorbent article upon storage of absorbent articles in a sealed diaper package.
  • the term "diaper package” denotes the package, in which the diapers are enclosed when selling the diapers. In some cases, the diapers are packed one by one, whereby a number of single-wrapped diapers then are further enclosed in a bigger package. Therefore, the term “diaper package” does not denote a single-wrapped diaper but the bigger diaper package.
  • the density of the structure is referred to as the exhibited density in the absorbent structure comprised in said articles within a sealed package for incontinence guards or sanitary napkins. Measurements of the density of the fragments must be made within 2 minutes after opening the package in question. The density should be measured at a load against the material being 0.5 kPa.
  • the super absorbent porous structure exhibits a Gurley stiffness value being lower than 700 mg. According to yet another embodiment, the super absorbent porous structure exhibits a Gurley stiffness value being lower than 500 mg.
  • the total absorption capacity per volume unit of the super absorbent porous structure in a dry condition is at least 15 g/cm 3 .
  • the total absorption capacity per cubic centimetre of the super absorbent porous structure in a dry condition is at least 27 g/cm 3 .
  • the total absorption capacity per cubic centimetre of the super absorbent porous structure in a dry condition is at least 35 g/cm 3 .
  • the invention also relates to an absorbent structure comprising an acquisition portion and a final storage portion, whereby the super absorbent porous structure constitutes the acquisition portion.
  • the acquisition portion exhibits a drainage rate, measured by a Liquid por ⁇ sim ⁇ ter device (from Textile Research Institute, Princeton, USA), being such that at least 50 % of the drainable pores in the super absorbent porous structure are emptied from liquid at a pressure being lower than 12 cm H 2 0.
  • the acquisition portion exhibits a drainage rate, measured by a Liquid porosimeter device, being such that at least 50 % of the drainable pores in the super absorbent porous structure are emptied from liquid at a pressure being lower than 8 cm H 2 0.
  • the acquisition portion exhibits a drainage rate, being such that at least 50 % of the drainable pores in the super absorbent porous structure are emptied from liquid at a pressure being lower than 6 cm H 2 0.
  • the drainage rate of the acquisition portion should not be lower than 2 cm H 2 0, and more preferred not lower than 4 cm H 2 0. In example 2 the method for the measurement of the drainage rate is described in more detail.
  • the final storage portion at least comprises a first storage layer, wherein the first storage layer is comprised of cellulosic fibres and super absorbent material, wherein the amount of super absorbent material calculated on the total weight of the first storage layer in a dry condition is at least 50 percent by weight. According to a similar embodiment, the amount of super absorbent material calculated on the total weight of the first storage layer in a dry condition is at least 70 percent by weight.
  • the first storage layer is comprised of cellulosic fibres and super absorbent material, wherein the amount of super absorbent material calculated on the total weight of the first storage layer in a dry condition is at least 50 percent by weight.
  • the amount of super absorbent material calculated on the total weight of the first storage layer in a dry condition is at least 70 percent by weight.
  • the absorbent structure also comprises a second storage layer.
  • the second storage layer preferably contains a lower amount of super absorbent material calculated on the total weight of the second storage layer.
  • the second storage layer lies for instance ciose against the "liquid permeable back sheet.
  • the second storage layer has preferably a larger extension than the first storage layer in the plane of the article.
  • the second storage layer functions as an extra security zone, i.e., it absorbs liquid that might be present outside the first storage layer or outside the acquisition portion.
  • Fig. 1 shows a planar view of an embodiment of an absorbent article according to the invention.
  • Fig. 2 shows a cross-section of the absorbent article shown in Fig. 1.
  • FIG. 1 a planar view of an absorbent article 100 according to the invention is shown.
  • the absorbent article 100 exhibits a transversal direction, being shown by a transversally extending centre line I, and a longitudinal direction being shown by a longitudinally extending centre line II. Further, the absorbent article 100 exhibits a thickness direction, being perpendicular to the plane.
  • the absorbent article 100 has a liquid permeable top sheet 101, which during use of the article is intended to lie closest to the user. Further, the absorbent article 100 has a back sheet 102, which is at least substantially liquid impermeable, and an absorbent structure 103 enclosed between the liquid permeable top sheet and the back sheet.
  • the back sheet material is at least substantially liquid impermeable
  • the absorbent structure 103 can optionally be a so called vapour permeable breathable material.
  • the absorbent structure 103 exhibits a crotch portion 108 and two end portions 109.
  • the 103 comprises an acquisition layer 104, which is intended to rapidly be able receive a large amount of liquid and a first storage layer 105, which is intended to rapidly be able store a large amount of liquid, and a second storage layer 106.
  • the first storage layer is arranged closest against the liquid permeable top sheet 101
  • the second storage layer 106 is arranged closest to the substantially liquid impermeable back sheet 102
  • the acquisition layer is arranged between the first storage layer 105 and the second storage layer 106.
  • the second storage layer 106 has a longer extension in the plane of the article than the first storage layer 105, but exhibits a lower total absorption capacity.
  • the second storage layer also functions as a form rendering element in such way that it assists in creating and maintaining an absorbent structure being flexible against the body.
  • the first storage layer 105 exhibits two longitudinally arranged apertures/recesses 110, 111.
  • the hollow spaces obtained through the apertures/recesses 110, 111 extend in the longitudinal direction of the article.
  • the distance between the apertures/recesses is preferably maximally 20 mm in the crotch portion.
  • the distance refers to the length of the material between the apertures/recesses 110, 111 in the transversal direction of the article.
  • the distance between the apertures/recesses is preferably somewhat longer than in the crotch portion. Such a shape is advantageous since both a narrow crotch portion and a shape adapted to the body is obtained.
  • the apertures/recesses 110, 111 in the first storage layer 105 have other shapes.
  • the apertures/recesses extend in the transversal direction of the article, whereby transversally arranged channels be obtained.
  • An advantage using this design is that such a storage layer relatively easily may assume a cup shape.
  • Another alternative embodiment is circular apertures/recesses.
  • the storage layers 105, 106 may comprise optional absorbent materials, such as fibrous materials, foam materials, superabsorbent polymers and combinations thereof.
  • the first storage layer 105 is a fibrous structure comprises at least 50 percent by weight of a super absorbent material calculated on the total weight of the first storage layer 105.
  • Super absorbent materials are polymers having the capability to absorb water or bodily fluids many times their own weight.
  • Conventionally super absorbent materials are polymers, such as polymers from polyacrylic acid.
  • the super absorbent material is present in the form of powder, flakes, fibres, granules or the like.
  • the super absorbent material in the storage layers 105, 106 may be mixed with the fibre material or may be applied as one or more layers between fibre layers.
  • the super absorbent material is either equally distributed in the first storage layer 105 or distributed in various concentrations in the longitudinal and/or the thickness direction of the first storage layer 105. It is also possible to use a substantially pure layer of super absorbent material in the first storage layer.
  • a suitable super absorbent material is a super absorbent material having the ability to rapidly absorb liquid.
  • a super absorbent material which can absorb 5 grams of bodily fluids per gram super absorbent material in 10 seconds, is usually defined as a fast super absorbent material.
  • a fast liquid-absorbing super absorbent material is a particulate super absorbent material having a small particle size, i.e., a low particle diameter. Such a particulate super absorbent material usually exhibits an average particle size of between 150 ⁇ m and 400 ⁇ m. It is also possible to use several types of super absorbent material, for example is it possible to use a super absorbent material which absorbs very rapidly in the first storage layer and a conventional super absorbent material absorbing slower in a second storage layer.
  • the percentage super absorbent material in the second storage layer 105 is lower than the amount of super absorbent material in the first storage layer 105.
  • the second storage layer 106 comprises 10 percent by weight of a super absorbent material calculated on the total weight of the second storage layer 106.
  • the second storage layer 106 has a longer extension, in the plane of the article, but exhibits a lower total absorption capacity.
  • the bodily fluids for example urine penetrates through the liquid permeable top sheet and is then brought via the hollow spaces, i.e., the apertures/recesses in the first storage layer 105, further to the acquisition layer 104.
  • the acquisition layer 104 is then drained on liquid by the first storage layer 105.
  • the acquisition layer may therefore without difficulties receive a second dose of liquid.
  • the first storage layer has the capacity to store several doses of liquid. Since the first storage layer is heavily compressed, it has been shown difficult for the liquid to penetrate the upper part of the structure.
  • the acquisition layer 104 is preferably a super absorben porous structure exhibiting a Gurley stiffness value being lower than 1000 mg and a density in a dry condition exceeding 0.5 g/cm 3 .
  • the super absorbent porous structure is a polyacrylate-based foam material. Examples of a suitable polyacrylate-based foam material are described in detail in Example 2 in the application.
  • the liquid permeable top sheet 101 can be a nonwoven material or an apertured plastic film, or a laminate thereof.
  • polymers of which the liquid permeable top sheet can be made of is polyethylene, polypropylene, polyester, or copolymers thereof.
  • the top sheet is often coated with tensides and/or is apertured. Since the first storage layer 105 is highly compressed and exhibits a high density, it is essential that the discharged liquid rapidly reaches the hollow spaces in the first storage layer 105. Therefore, an open liquid permeable top sheet has been shown to be advantageous.
  • An example of an open material is a layer of continuous fibres, which is joined as points, beads or spots, in a binding pattern but are otherwise substantially not connected to each other.
  • the back sheet 102 can comprise of a plastic layer, a nonwoven layer or a laminate thereof.
  • the back sheet 102 is of the breathable kind. All materials being used as back sheet for absorbent articles can be used.
  • Figure 2 shows a cross-section through the crotch portion 108 of the absorbent article 100 shown in Figure 1.
  • the absorbent article 100 has a liquid permeable top sheet 101, which during use of the article is intended to lie closest to the user, a substantially liquid impermeable back sheet 102, and an absorbent structure 103 enclosed therebetween.
  • the absorbent structure 103 comprises an acquisition layer 104, which is intended to rapidly be able to receive a large amount of liquid, a first storage layer 105, which is intended to rapidly be able to store a large amount of liquid, and a second storage layer 106 having a longer extension in the plane of the article, but exhibits a lower total absorption capacity.
  • the first storage layer 105 exhibits two longitudinally arranged apertures/recesses/ hollow spaces 107.
  • the distance of the material between the two apertures/recesses is preferably maximally 20 mm in the crotch portion 108.
  • the first storage iayer 105 is arranged closest towards the liquid permeable top sheet 101
  • the second storage layer 106 is arranged closest to the substantially liquid impermeable backsheet 102
  • the acquisition layer 104 is arranged between the first storage layer 105 and the second storage layer 106.
  • the described absorbent article only constitutes an example of an absorbent article according to the invention.
  • the super absorbent porous structure according to the invention constitutes an acquisition layer, which acquisition layer is arranged between a first storage layer and a second storage layer.
  • the super absorbent porous structure is an acquisition layer, arranged directly under a liquid permeable top sheet. Further, it is also possible that the super absorbent porous structure is an acquisition layer, arranged closest to the user. In such embodiment, the acquisition layer also functions as a liquid permeable cover layer.
  • the stiffness of the acquisition layer has been measured.
  • the equipment used for the measurement is the "Gurley Precision Instruments", made in Troy, New York, USA.
  • the measurements were performed according to the method description Instructions for Gurley bending resistance/stiffness testers, models 4171 C, D, E". During the measurements, the digital method 4171 D was used.
  • Sample 1 is a mixed structure of chemically manufactured cellulosic fluff pulp from Weyerhauser and a particulate polyacrylate-based super absorbent material from BASF.
  • the mixed structure contains 40 percent by weight of super absorbent material based on the total weight of the sample.
  • Sample 2 is a fibre structure from Weyerhauser.
  • the fibre structure contains 80 percent by weight cross-linked cellulose and 20 percent by weight of thermoplastic fibres.
  • Sample 3 is a polyester fibre layer having particulate polyacrylate-based super absorbent material bound to the polyester fibre layer.
  • the percentage of super absorbent particles is 60 percent based on the total weight of the sample.
  • Sample 4 is a polyacrylate-based super absorbent foam layer.
  • the foam layer is denoted Foam XII and is more closely described in Example 2.
  • Sample 5 is a polyacrylate-based super absorbent foam layer.
  • the foam layer is denoted Foam XV and is more closely described in Example 2.
  • Sample 6 is a viscose foam material, i.e., a foam material from regenerated cellulose.
  • the samples were placed in the test equipment after 10-30 seconds.
  • the density is given in g/cm 3 and the stiffness in milligrams.
  • the density was measured at a load being 0.5 kPa. Table 1
  • Foam XII has been made according to the following: To a beaker the following is added:
  • the ingredients were mixed and thereafter, the solution was cooled to a temperature lower than 16 °C.
  • the solution was the poured into a closed container, whereby the solution was saturated with carbon dioxide at a pressure of 12 bars for 25 minutes.
  • 26.7 grams of an aqueous solution containing 3 percent by weight of 2,2'-azobis(2-amidinopropane) dihydrochloride was added. This was mixed to a homogenous solution.
  • the solution was then allowed to rest in five minutes.
  • the saturated solution was compressed from a container using a nozzle having an opening being 1 mm at a pressure being 12 bars.
  • the resulting monomeric foam was placed on a glass plate (DIN-A3). An additional glass plate was then placed on top of the monomeric foam.
  • Foam XV was made in the same way. The difference between Foam XII and Foam XV was that more cross-linking agent (i.e., polyethylene glycol diacrylate) was used for making Foam XV. 40.0 grams of polyethylene glycol diacrylate instead of 28.0 grams was added for making Foam XV.
  • cross-linking agent i.e., polyethylene glycol diacrylate
  • PV 5Q is the pressure when 50 % of the drainable pores have been emptied.
  • the PV 50 value is obtained by measuring the amount of liquid as a function of the pressure in the chamber in a receding measurement and register when 50 % of the drainable pores have been emptied. Upon a receding measurement, the amount of liquid is measured, being emptied from a porous material at a certain pressure in the chamber. At the measurement excess liquid is delivered to the sample. The sample is allowed to absorb this liquid. Then the sample is placed in the chamber on a membrane and a porous plate. A mechanical load is applied. Thereafter the chamber is closed and the air pressure inside the chamber is raised successively in steps by means of a computer-controlled pressure maintaining system, whereby the liquid leaves the sample through a membrane having small pores. The weight of the squeezed liquid is registered using a beam balance.
  • the amount of liquid present in the sample upon full saturation when it is in the chamber is estimated, M 0 (g).
  • M D (g) The pressure at which 50 % of the drainable liquid has been drained out of the samples is calculated according to the following:
  • PV 50 should be lower than 12 cm H 2 0, more preferably lower than 8 cm H 2 0, and most preferred lower than 6 cm H 2 0.
  • the PV 50 value should not be lower than 2 cm H 2 0, and preferably not lower than 4 cm H 2 0.
  • the samples were kept in sealed plastic bags in order to avoid absorption of moisture from the air.
  • the dry sample was weighed. Thereafter, the sample was placed in the test chamber on membranes (Millipore 0.22 ⁇ m cat. No. GSWP 09000), whereby the sample was allowed to swell in excess liquid during 30 minutes.
  • the size of the sample after swelling was 10-25 cm 2 .
  • the ion concentration in the liquid was 0.135 M sodium, 0.085 M potassium, 0.0035 M magnesium, 0.002 M calcium, 0.19 M chloride, 0.0055 M sulphate, and 0.031 phosphate. Additionally, the liquid contained 0.3 M urea and 1 ppm w/w Triton TX-100 (Calbiochem-648462). The liquid was made in such a way that no salts were precipitated.
  • a load covering the whole sample surface was placed on the sample during the swelling and the measurement.
  • non-absorbent polyurethane foam was placed between the sample and the applied load.
  • the total load put on the swelled sample was 0.3 kPa.
  • the equilibrium velocity i.e., the velocity when the weight change at the selected air pressure had decreased to an insignificant level, was upon measuring 5 mg/min and the measure time during which the weight change was recorded was 30 seconds.
  • the measurements were made at the following applied air pressures measured in cm H 2 0: 1.1-1.2-1.4-1.7-2.0-2.2-2.4-2.7- 3.1-3.5-4.1-4.4-4.7-5.1-5.6-6.1-6.8-7.7-8.7-10.2-11.1-12.2-13.6-15.3-17.5-20.4-24.5-30.6- 40.8-49.0-61.2.
  • the sample was weighed directly after each terminated measurement. In addition to the measurement on samples one blank control run was performed. At the control run, only foam and load was placed in the test chamber. The measurement was performed the same way and using the same conditions as for the sample measurements. The control run is then subtracted from the sample run before continued processing of raw data.
  • Sample 1 is a mixed structure of chemically manufactured cellulosic fluff pulp from Weyerhauser and a particulate polyacrylate-based super absorbent material from BASF. The mixed structure contains 40 percent by weight of super absorbent material based on the total weight of the sample.
  • Sample 2 is a fibre structure from Weyerhauser. The fibre structure contains 80 percent by weight cross-linked cellulose and 20 percent by weight of thermo fibres.
  • o Sample 3 is a polyester fibre layer having particulate polyacrylate-based super absorbent material bound to the polyester fibre layer. The percentage of super absorbent particles is 60 percent based on the total weight of the sample.
  • o Sample 4 is a polyacrylate-based super absorbent foam layer.
  • the foam layer is denoted Foam XII and is more closely described in Example 2.
  • Sample 5 is a polyacrylate-based super absorbent foam layer.
  • the foam layer is denoted Foam XV and is more closely described in Example 2.
  • Sample 6 is a viscose foam material, i.e., a foam material from regenerated cellulose.
  • the measurement was performed by first weighing the dry sample. The volume of dry sample is then obtained by dividing the weight of the dry sample with the density of the dry sample. The sample was then saturated using a NaCI solution containing 0.9 percent NaCI by weight. The NaCI solution was delivered to the sample in excess. Thereafter, the saturated sample was weighed. The amount of liquid absorbed was obtained by subtracting the weight of the dry sample from the weight of the saturated sample.
  • Foam XII i.e., sample 4
  • significantly exhibits a higher total absorption capacity measured in grams per cubic centimetres of the absorbent material in a dry condition.

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  • Public Health (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • Chemical & Material Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • General Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Dispersion Chemistry (AREA)
  • Hematology (AREA)
  • Materials Engineering (AREA)

Abstract

La présente invention concerne un article absorbant tel qu'une couche, une protection contre l'incontinence, une serviette hygiénique ou un élément semblable, qui présente une surface perméable au liquide et une surface opposée au moins sensiblement imperméable au liquide et comprenant une structure absorbante. Cette structure absorbante comprend une structure poreuse superabsorbante présentant une valeur de rigidité Gurley inférieure à 100 mg et une densité à sec dépassant 0,5 g/cm3.
PCT/SE2004/000354 2003-03-26 2004-03-11 Article absorbant comprenant une structure absorbante WO2004084783A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0300877-8 2003-03-26
SE0300877A SE0300877D0 (sv) 2003-03-26 2003-03-26 Absorbent article comprising an absorbent structure

Publications (1)

Publication Number Publication Date
WO2004084783A1 true WO2004084783A1 (fr) 2004-10-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/000354 WO2004084783A1 (fr) 2003-03-26 2004-03-11 Article absorbant comprenant une structure absorbante

Country Status (2)

Country Link
SE (1) SE0300877D0 (fr)
WO (1) WO2004084783A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009215664B2 (en) * 2008-02-22 2014-07-03 Allergan, Inc. Sustained release poloxamer containing pharmaceutical compositions

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797966A1 (fr) * 1996-03-29 1997-10-01 The Procter & Gamble Company Mousse superabsorbante présentant des pores éboulés
WO1999055393A1 (fr) * 1998-04-28 1999-11-04 Sca Hygiene Products Ab Structure absorbante ayant des proprietes d'absorption ameliorees
WO1999063922A1 (fr) * 1998-06-08 1999-12-16 Bki Holding Corporation Structures absorbantes a couches de distribution et de stockage de fluide
EP1161928A1 (fr) * 1993-05-12 2001-12-12 Kimberly-Clark Worldwide, Inc. Article absorbant
EP1291380A1 (fr) * 2000-06-02 2003-03-12 New Japan Chemical Co.,Ltd. Film de polypropylene poreux, son procede de production et article absorbant utilisant ce film

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1161928A1 (fr) * 1993-05-12 2001-12-12 Kimberly-Clark Worldwide, Inc. Article absorbant
EP0797966A1 (fr) * 1996-03-29 1997-10-01 The Procter & Gamble Company Mousse superabsorbante présentant des pores éboulés
WO1999055393A1 (fr) * 1998-04-28 1999-11-04 Sca Hygiene Products Ab Structure absorbante ayant des proprietes d'absorption ameliorees
WO1999063922A1 (fr) * 1998-06-08 1999-12-16 Bki Holding Corporation Structures absorbantes a couches de distribution et de stockage de fluide
EP1291380A1 (fr) * 2000-06-02 2003-03-12 New Japan Chemical Co.,Ltd. Film de polypropylene poreux, son procede de production et article absorbant utilisant ce film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2009215664B2 (en) * 2008-02-22 2014-07-03 Allergan, Inc. Sustained release poloxamer containing pharmaceutical compositions

Also Published As

Publication number Publication date
SE0300877D0 (sv) 2003-03-26

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