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WO2013009225A1 - Matériau composite absorbant et article absorbant comportant le matériau composite absorbant - Google Patents

Matériau composite absorbant et article absorbant comportant le matériau composite absorbant Download PDF

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Publication number
WO2013009225A1
WO2013009225A1 PCT/SE2011/050936 SE2011050936W WO2013009225A1 WO 2013009225 A1 WO2013009225 A1 WO 2013009225A1 SE 2011050936 W SE2011050936 W SE 2011050936W WO 2013009225 A1 WO2013009225 A1 WO 2013009225A1
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WO
WIPO (PCT)
Prior art keywords
absorbent
composite material
cellulose
polymer component
absorbent composite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2011/050936
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English (en)
Inventor
Shabira Abbas
Anette Larsson
Mikael Larsson
Johan HJÄRTSTAM
Ingrid Gustafson
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.)
Essity Hygiene and Health AB
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
Priority to PCT/SE2011/050936 priority Critical patent/WO2013009225A1/fr
Publication of WO2013009225A1 publication Critical patent/WO2013009225A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • 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
    • 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
    • A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
    • A61L15/28—Polysaccharides or their derivatives
    • 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
    • A61L15/62—Compostable, hydrosoluble or hydrodegradable materials

Definitions

  • the present invention relates to an absorbent composite material comprising an intimate mixture of network-forming cellulose fibrils having a diameter of from 1 nm to 100 ⁇ , a hydrophilic absorbent polymer component bonded to the cellulose fibrils; and a water soluble polymer component.
  • the invention also relates to an absorbent article comprising the absorbent composite material and to the use of the composite material for absorbing blood and feces and as an active agent release material.
  • absorbent often superabsorbent materials with desirable properties such as high absorption, high storage capacity, high gel strength and high mechanical strength.
  • the absorbent materials may comprise two or more layers such as liquid acquisition layers, storage layers and distribution layers.
  • a liquid absorbent material should have high instant liquid intake capacity. It is common to use open bulky structures with large capillaries as such structures have rapid liquid acquisition. Some examples of such materials are cellulosic fluff pulp of the thermo-mechanical or chemical thermo- mechanical (CTMP) type, chemically stiffened cellulosic fibres, waddings of synthetic fibres and porous foam materials. It is usually preferred that the acquisition materials retain their open structure even under some pressure and/or that they are resilient so that they may regain a bulky structure after having been compressed.
  • CMP thermo-mechanical or chemical thermo- mechanical
  • a good liquid storage and retention capacity may be obtained by the use of
  • Superabsorbent materials are commonly understood as being crosslinked polymers with the capacity to absorb liquid many times their own weight upon swelling.
  • the superabsorbent material in an absorbent structure i.e. a diaper core
  • an absorbent structure i.e. a diaper core
  • the fibrous matrix usually consists of cellulosic fluff pulp of thermo-mechanical, chemical or chemical thermo-mechanical type, but a certain amount of synthetic fibres may also be used, e.g. to provide the structure with increased wet resiliency and/or the ability of being thermally stabilized.
  • a problem with absorbent structures containing superabsorbent material is that the commonly used superabsorbents are generally less well suited for absorption of bodily fluids such as menses and runny feces that comprise viscous components.
  • bodily fluids such as menses and runny feces that comprise viscous components.
  • absorbent superabsorbents are adapted for urine absorption.
  • highly viscous components of the fluid will not be absorbed by the superabsorbent particles.
  • a further problem with traditional absorbent structures containing superabsorbent particles is that it is difficult to achieve a desired distribution of the superabsorbent material in the structure and to retain the superabsorbent in a desired location in the absorbent structure during transport, storage and use of the article. It has been suggested in the art to combine superabsorbent polymers and fibrous material, such as cellulose fibres in order to overcome the problems with retention of the superabsorbent in an absorbent structure.
  • An example of a material comprising cellulosic fibers and superabsorbent polymers is disclosed in US 2003/01 1 1 163, which describes a process for making an absorbent fibrous web composite including a stable and controllable dispersion of superabsorbent polymer.
  • Two polymer precursors for example, acrylic acid or methacrylic acid, are added in separate stages to form a superabsorbing polymer on or in a pre-formed fibrous web, which includes a plurality of hydrophilic fibres, e.g. microfibrillar cellulose or
  • microcrystalline cellulose microcrystalline cellulose
  • US 2003/01 1 1774 discloses a process for making an absorbent fibrous composite nonwoven web including e.g. superabsorbent polymers and a plurality of hydrophilic fibres. The polymerization of the superabsorbent polymer is integrated into the process of forming the absorbent composite nonwoven web.
  • EP 1 207 914 discloses an absorbent structure comprising an open-cell foam structure wherein the pore walls of the structure comprise a liquid-storing material, e.g. polyacrylate.
  • the absorbent structure is characterized in that the pores of the foam structure contain hydrophilic fibres, e.g. cellulose fibres, at which at least the main part of the hydrophilic fibres are firmly anchored in the pore walls of the foam structure, and that the fibre amount is at least 10 % by weight of the total weight of the open-cell foam in dry condition.
  • cellulosic in connection with fibers or fibrils refers to fibrils or fibers from natural sources such as wood, cotton, etc., regenerated cellulose and the derivatives from these fibers by means of chemical, mechanical, thermal treatment or any combination of these. Further, cellulosic fibers also includes cellulosic or cellulose-containing fibers produced by microorganisms.
  • nanofibrils means individual fibrils having a diameter equal to or less than 100 nm at all points along the nanofibril. The practical lower limit for the fiber diameter is approximately 1 nm. The diameter may vary along its length.
  • the nanofibrils may exist as individual fibres and/or as clusters of nanofibrils.
  • NFC nanofibrillated cellulose
  • Whiskers are a particular form of nanofibrils having an aspect ratio of at least 2. Nanofibrils having a smaller aspect ratio do not qualify as whiskers.
  • microfibres means individual fibres having a diameter equal or greater than 100 nm but less than or equal to 100 ym at all points along the microfibre. More specifically, the microfibres may have a diameter greater than 100 nm but less than or equal to 10 pm or a diameter greater than 100 nm but less than or equal to 1 m. The diameter may vary along the length of the microfibre.
  • the microfibres may exist as individual microfibres and/or as clusters of microfibres in the composite.
  • MFC microfibrillated cellulose
  • Microfibrillated cellulose may comprise a fraction of nanofibrils.
  • porous is used herein to describe a material that has pores and, which admits the passage of gas or liquid through these pores.
  • composite means a structure made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct, where said constituent materials are intimately integrated in each other such that they surround each other completely or in-part. Other components may also be present in the composite, as disclosed herein.
  • polymer includes, but is not limited to, homopolymers, copolymers, such as for example, block, graft, random and alternating copolymers, terpolymers, etc. and blends and modifications thereof.
  • polymer shall include all possible configurational isomers of the material.
  • Superabsorbent polymer is used herein to refer to water-swellable, water-insoluble organic or inorganic materials capable of absorbing at least about 20 times their own weight in an aqueous solution containing 0.9 weight percent (wt %) of sodium chloride.
  • Organic materials suitable for use as a superabsorbent material can include natural materials such as polysaccharides (including modified polysaccharides such as CMC: carboxymethyl cellulose), polypeptides and the like, as well as synthetic materials such as synthetic hydrogel polymers.
  • Such hydrogel polymers include, for example, alkali metal salts of polyacrylic acids (pAA), polyacrylamides, polyvinyl alcohol, polyacrylates, polyvinyl pyridines, and the like.
  • Other suitable polymers include hydrolyzed acrylonitrile grafted starch, acrylic acid grafted starch, and isobutylene maleic anhydride copolymers and mixtures thereof.
  • the hydrogel polymers are preferably lightly crosslinked to render the material substantially water insoluble.
  • Preferred superabsorbent materials may be further surface crosslinked so that the outer surface or shell of the superabsorbent particle, fibre, flake, sphere, etc. possesses a higher crosslink density than the inner portion of the superabsorbent.
  • crosslinked is used herein to describe a material composed of linear polymer chains which have been submitted to crosslinking by means of a cross-linking agent so that the linear polymer chain has been transformed into a three-dimensional network structure.
  • bonded includes both "intrinsic bonding” arising from direct bonding by means of physical and chemical interactions between the components of the composites according to the invention as well as bonds created by the use of a cross- linking agent.
  • particle includes powders, granules, flakes, spheres, short fibers, and the like.
  • Foam as used herein is a material that has been formed by trapping gas bubbles in a liquid or solid. Foams that are used for absorption purposes are of the open- cell type containing pores that are connected to each other and form an interconnected network.
  • Menstrual fluid is a body fluid containing mucus, tissue, microorganisms and blood.
  • the composition of menstrual fluid varies between individuals.
  • Blood is a fluid having high viscosity as compared to urine or water.
  • the composition of blood is approximately 45 % blood cells and approximately 55 % blood plasma.
  • the blood plasma is an electrolyte and contains salts, water and proteins (e.g. albumin, IgG and fibrinogen). The proteins add up to about 7-8 % of the blood plasma.
  • the amount of protein in blood is in the order of 10 17 /ml blood, and the amount of blood cells is in the order of 10 9 /ml blood.
  • the high-viscous part or the high viscous phase of the menstrual fluid consists of the mucus, tissue, microorganisms and blood cells/blood clots while the low viscous or aqueous phase is made up of the blood plasma.
  • “Runny feces” is fecal matter that is a mixture of a low viscous, watery phase and more solid or high viscous parts.
  • absorbent article includes diapers, incontinence guards, sanitary napkins, panty liners, wound dressings, bed protectors, seat covers, and the like.
  • an absorbent composite material comprising an intimate mixture of:
  • a) network-forming cellulose fibrils having a diameter of from 1 nm to 100 pm, preferably from 3 nm to - 100 pm, such as from 100 nm - 100 pm;
  • the hydrophilic absorbent polymer component remains bonded to the cellulose fibrils when the absorbent composite material is wet and the water soluble polymer component is solubilized when the absorbent composite material is wet.
  • the water soluble polymer component is a compound having the capability of increasing the dynamic viscosity of the aqueous portion of body fluids such as menses and runny feces.
  • the water soluble polymer component has the capability of increasing the dynamic viscosity of the aqueous portion of body fluids such as menses and runny feces at least 10 times, preferably at least 100 times and most preferably at least 1000 times.
  • the absorbent composite material of the invention has excellent ability of handling both the low viscosity phase and the high-viscosity components of body fluids such as menses and runny feces.
  • body fluids such as menses and runny feces.
  • the composite material according to the invention When exposed to body fluid comprising highly viscous components contained in a low- viscosity phase, the composite material according to the invention will absorb and retain both low viscosity parts and high viscosity parts of the fluid by a combination of absorption and immobilization.
  • the water soluble polymer component in the composite in addition to low-viscosity parts of the body fluids being absorbed by the hydrophilic absorbent component in the composite, the water soluble polymer component in the composite is solubilized and released into the body fluid when the composite is wetted by body fluid.
  • the cellulose fibrils in the absorbent composite material of the invention may be selected from microfibrillated cellulose (MFC), nanofibril cellulose (NFC), nanocrystalline cellulose (NCC), whiskers or combinations and mixtures thereof.
  • the absorbent composite material according to the invention may comprise at most 25 wt. % cellulosic fibers having an average diameter greater than 100 ⁇ , preferably at most 10 wt.%, more preferably at most 5 wt. % and most preferably 0 wt % cellulosic fibers having an average diameter greater than 100 pm.
  • the water soluble polymer component is preferably a linear hydrophilic polymer having sufficient molecular weight to achieve a functional raise in the viscosity of the aqueous phase of body fluids such as menses and runny feces.
  • the polymer component may be an electrically charged component or may be non-charged.
  • the water soluble polymer component in the composite material according to the invention may be selected from: polyacrylic acid, polyacrylates and polymetacrylates, sodium alginate, pectin, polysaccharides including chitosan, starch and modified polysaccharides such as modified starch, methyl cellulose (MC), carboxymethyl cellulose (CMC), hydroxyethylcellulose (HEC) hydroxypropylmethyl cellulose (HPMC),
  • HPC hydroxypropyl cellulose
  • EHEC ethyl hydroxyethylcellulose
  • PVH polyvinylalcohol
  • PVA polyvinylacetate
  • PMMA polyethylene oxide
  • polyacrylamides hydrolyzed polyacrylamides
  • polyvinyl pyridines hydrolyzed acrylonitrile
  • Suitable polymers for use as the hydrophilic absorbent component that is bonded to the cellulose fibrils in the absorbent composite of the invention may include: natural materials such as polysaccharides including chitosan, starch and modified polysaccharides such as0 modified starch, methyl cellulose (MC), carboxymethyl cellulose (CMC),
  • HEC hydroxyethylcellulose
  • HPMC hydroxypropylmethyl cellulose
  • HPMC hydroxypropyl cellulose
  • EHEC ethyl hydroxyethylcellulose
  • AA acrylic acid
  • methacrylic acids and its salts and combinations thereof acrylonitrile
  • acrylic esters e.g.
  • tert-butyl- or5 methylacrylic acid ester unsaturated lactones, anhydrides, acrylamide monomers, secondary or tertiary acrylamides, or other alkenes, monomers having at least one alkene (olefin) group and at least one sulfonate or sulfonic acid group, ethylene sulfonate esters, ethylene sulfonic halides and heterocyclic monomers containing sulphonamide linkages are suitable monomers. Combination of these monomers with each other, and with other0 monomers, is possible when forming the polymers according to the invention.
  • superabsorbent polymers may be polymeric sulfonic acids such as styrene sulfonic acid, sodium styrene sulfonate and/or similar compounds. If neutral monomers are used these may be hydrolysed in order to achieve a charged polymer, as known in the art. 5
  • the water soluble polymer component may be different from the hydrophilic absorbent polymer component or the hydrophilic absorbent polymer component and the water soluble polymer component may be parts of the same polymer composition.
  • the polymer composition may either be a polymer composition having the intrinsic ability of interacting with and binding to the cellulose fibrils such that part of said polymer0 remains bonded to said cellulose fibrils when said composite material is in a wet state and part of said polymer is solubilized when said composite material is in a wet state.
  • Preferred polymer compositions are those which a chemical structure that is similar to that of the cellulose fibrils, such as polymer compositions based on modified cellulose.
  • Particularly preferred polymer compositions are those selected from: hydroxypropylmethyl5 cellulose (HPMC), hydroxylpropyl cellulose (HPC), hydroxyethyl cellulose (HEC), ethylhydroxyethyl cellulose (EHEC), and mixtures thereof. It is believed that such polymer compositions interact with the cellulose fibrils and may contribute to increasing the network strength of the composite material of the invention.
  • the hydrophilic absorbent polymer component may be a crosslinkable component that has been bonded to the cellulose fibrils by crosslinking as defined herein.
  • crosslinkable component may be selected from one or more of: polyacrylic acid, grafted starch, carboxy methyl cellulose and polyvinyl alcohol.
  • the absorbent composite material of the invention may comprise more than one hydrophilic absorbent polymer component that is bonded to the cellulose fibrils and more than one water soluble polymer component. Polymer compositions providing both bonding/absorption and polymer release/viscosity increase may be combined with polymers providing only one of these functions.
  • the polymer composition such as hydroxypropylmethyl cellulose (HPMC), hydroxylpropyl cellulose (HPC), hydroxyethyl cellulose (HEC), ethylhydroxyethyl cellulose (EHEC), and mixtures thereof, may constitute from 20-70 wt % of the absorbent composite based on the dry weight of the composite.
  • HPMC hydroxypropylmethyl cellulose
  • HPC hydroxylpropyl cellulose
  • HEC hydroxyethyl cellulose
  • EHEC ethylhydroxyethyl cellulose
  • the absorbent composite material of the invention may be composed of 1 -99 wt % of the fibrils, preferably 20-99 wt %, more preferably 30-70 wt %.
  • the cross-linked hydrophilic absorbent polymer component may be present in the absorbent composite material of the invention in an amount of 5-95 wt %, preferably 10- 70 wt %, more preferably 30-60 wt % based on the dry weight of the composite.
  • the water soluble polymer component may be present in the absorbent composite material of the invention in an amount of 5-95 wt %, preferably 10-70 wt %, more preferably 30-60 wt % based on the dry weight of the composite.
  • the absorbent composite material of the invention may further comprise at least one active agent selected from: odor inhibiting agents, anti-microbial agents, perfumes, skin care agents, odor reducing agents, nutrients for lactic acid producing bacteria, etc.
  • the active agent will be released from the composite material when it becomes wetted by body fluid.
  • the absorbent composite material of the invention may be a component of an absorbent article and in particular of an absorbent article for personal care such as a diaper, a pant diaper, an incontinence guard, a sanitary napkin, a panty liner, or the like.
  • the absorbent composite material of the invention is particularly suited for use in absorbent articles intended for blood absorption such as sanitary napkins, panty liner and hybrid
  • the absorbent article of the invention is preferably of the kind that comprises a liquid pervious topsheet, a liquid impervious backsheet and an absorbent core arranged between the liquid pervious topsheet and the liquid impervious backsheet and wherein the absorbent core comprises the absorbent composite material.
  • the invention is also directed to the use of an absorbent composite material as set out herein for absorbing blood and to the use of the composite material as a combined liquid absorbing structure and active agent release material.
  • the absorbent composite material of the invention may have the ability of practically one- dimensional swelling of the structure when it is wetted with body fluid.
  • one-dimensional swelling as used herein is implied that the material swells to a considerable extent in a first direction, such as up to 20 times or more of its original unloaded dimension in that direction and only to a negligible extent in the directions perpendicular to the first direction.
  • a sheet made from the absorbent composite of the invention may swell less than 1.2 in the x-y plane of the sheet and more than 20 times in the z-direction or thickness direction of the sheet.
  • the absorbent composite of the invention may be in the form of a foam. If in the form of a foam, the nanofibrils may be incorporated into the pore walls of the foam.
  • the foam may have a pore size gradient. Additionally, the foam may comprise one or more substances selected from the group consisting of; plasticizers, surfactants and blowing agents.
  • the composites of the invention comprising a polymeric compound that has the inherent ability of binding to cellulose fibrils may be made according to a method comprising the steps of:
  • HPMC hydroxypropylmethyl cellulose
  • HPC hydroxylpropyl cellulose
  • HEC hydroxyethyl cellulose
  • EHEC ethylhydroxyethyl cellulose
  • the composites of the invention comprising a polymeric compound that is bonded to the cellulose fibrils by means of a cross-linking agent may be made according to a method comprising the steps of:
  • the initiator may be selected from the group consisting of oxidizing initiators, azo initiators, photoinitiators and/or thermal initators.
  • the drying step may be carried out with any suitable means as known in the art such as by convective heating, by IR or by freeze drying.
  • the above methods may further comprise a step of forming the composite into particles. If a foam is to be formed, the above methods may further comprise a step of forming the composite into a foam.
  • the method for making the foam may further comprise the steps of adding one or more substances selected from the group consisting of; plasticizers, surfactants and blowing agents.
  • the absorbent article according to the invention may be a feminine product, such as sanitary napkins and pantyliners, as well as baby diapers and incontinence guards.
  • the invention provides an absorbent article, wherein said absorbent article is a diaper, a pant diaper, an incontinence guard, a sanitary napkin or the like and of the kind comprising a liquid pervious topsheet, a liquid impervious backsheet having an absorbent core comprising the absorbent composite arranged between the topsheet and the backsheet.
  • the absorbent core may further comprise additional materials and components such as foam, superabsorbents, binders, absorbent and non-absorbent fibrous material, e.g. cellulose fibers, synthetic fibers, tissue layers or non-woven materials in combination with the absorbent polymer composite.
  • the composites of the invention may be incorporated into the absorbent article in the form of foams, films, webs, or particles or mixtures of these forms of the composite.
  • the dry composite may be more film-like if the fibre content is low or more like a fibrous web if the composite has a higher content of fibrils.
  • the dried sheet-like structure may be ground or divided into smaller pieces by means of any suitable method such as cutting or shredding.
  • FIG. 1 illustrates swelling behavior for MFC-HPMC composites, depending on
  • HPMC content The water uptake per initial dry weight for initial HPMC contents of; 0 % ( A ), 20 % ( ⁇ ), 35 % (o), 50 % ( ⁇ ), and 65 % ( ⁇ ) w/w is shown.
  • Figure 2 shows percentage of HPMC released at different times for MFC-HPMC composites with 20 % ( ⁇ ), 35 % (o) and 65 % ( A ) w/w HPMC.
  • Figure 3 shows SEM images of swollen and freeze dried MFC HPMC
  • Top row images are at a magnification of 10000X for samples with initial HPMC contents of (a) 0 %, (b) 20 % and (c) 50 % w/w.
  • Bottom row is images are at a magnification of 100000X for samples with initial HPMC contents of (d) 0 %, (e) 20 % and (f) 50 % w/w.
  • Figure 4 shows a SEM image of the cross-section of a swollen and freeze dried
  • MFC HPMC composite having initial HPMC content of 50 % w/w.
  • HPMC is an associative polymer that forms complexes between and within polymer chains, and could potentially bind strongly to the MFC in the composites. It is theorized that the similarity of the materials may make it possible for non-substituted regions of the HPMC to form hydrogen bonds with the MFC surfaces. If HPMC were to bind strongly to the MFC, it would not be able to leave the composite, but would gel inside the composite.
  • Micro fibritlated cellulose was bought from the Paper and Fibre Research Institute PFI, Trondheim, Norway.
  • the MFC had been prepared from commercial bleached kraft pulp using a mechanical pre-treatment followed by homogenization and has previously been characterized as being highly heterogeneous.
  • Hydroxypropyl methyl cellulose HPMC was of the grade 90 SH 100 SR, Shin-Etsu Chemical Co., Ltd., Tokyo, Japan. The swelling and release experiments were performed using deionized water.
  • Phosphate buffer for SEC-RI analysis was prepared from analytical grade ingredients.
  • the mass HPMC retained within the composites per mass of initial MFC after 24 h was 0.14, 0.26 and 0.41 for composites with 20, 35 and 65 % w/w HPMC, respectively. Based on the swelling results, it seems as if composites with higher HPMC content had formed different structures during the composite forming process, and as if those structures had an increased MFC surface area, which could be because HPMC prevents aggregation of MFC during composite formation, similar to the effect of hemicelluloses in preventing the coalescence of cellulose microfibrils during drying.

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  • General Health & Medical Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)
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Abstract

La présente invention concerne un matériau composite absorbant comportant un mélange intime: a) de fibrilles de cellulose formant réseau ayant un diamètre compris entre 1nm et 100nm, b) d'un composant polymère absorbant hydrophile lié aux fibrilles de cellulose ; et c) d'un composant polymère hydrosoluble. L'invention est caractérisé en ce que le composant polymère absorbant hydrophile reste lié aux fibrilles de cellulose lorsque le matériau composite est humide et le composant polymère hydrosoluble est solubilisé lorsque le matériau composite absorbant est humide, le composant polymère étant un composé ayant la capacité d'accroître la viscosité de la partie aqueuse des liquides organiques tels que les règles et les selles liquides.
PCT/SE2011/050936 2011-07-08 2011-07-08 Matériau composite absorbant et article absorbant comportant le matériau composite absorbant Ceased WO2013009225A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014206835A1 (fr) 2013-06-26 2014-12-31 Basf Se Procédés pour améliorer l'efficacité d'herbicides anioniques en eau dure et compositions appropriées
CN112451733A (zh) * 2020-12-05 2021-03-09 贵州卡布婴童用品有限责任公司 一种超吸收纸尿裤的制作工艺
US11345878B2 (en) 2018-04-03 2022-05-31 Novaflux Inc. Cleaning composition with superabsorbent polymer
US11680226B2 (en) 2016-09-30 2023-06-20 Novaflux, Inc.. Compositions for cleaning and decontamination
US11918677B2 (en) 2019-10-03 2024-03-05 Protegera, Inc. Oral cavity cleaning composition method and apparatus
US12064495B2 (en) 2019-10-03 2024-08-20 Protegera, Inc. Oral cavity cleaning composition, method, and apparatus

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