WO2005042631A2 - Produits pouvant se disperser dans l'eau - Google Patents

Produits pouvant se disperser dans l'eau Download PDF

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Publication number
WO2005042631A2
WO2005042631A2 PCT/US2004/036232 US2004036232W WO2005042631A2 WO 2005042631 A2 WO2005042631 A2 WO 2005042631A2 US 2004036232 W US2004036232 W US 2004036232W WO 2005042631 A2 WO2005042631 A2 WO 2005042631A2
Authority
WO
WIPO (PCT)
Prior art keywords
fiber sheet
fiber
water dispersible
fibers
water
Prior art date
Application number
PCT/US2004/036232
Other languages
English (en)
Other versions
WO2005042631A3 (fr
Inventor
Wai Ming Choi
Howard Yu
Original Assignee
Hollingsworth & Vose Company
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 Hollingsworth & Vose Company filed Critical Hollingsworth & Vose Company
Priority to CA002543015A priority Critical patent/CA2543015A1/fr
Priority to EP04817498A priority patent/EP1682720A4/fr
Publication of WO2005042631A2 publication Critical patent/WO2005042631A2/fr
Publication of WO2005042631A3 publication Critical patent/WO2005042631A3/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1615—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of natural origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B01D39/163—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin sintered or bonded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
    • B01D2239/0266—Types of fibres, filaments or particles, self-supporting or supported materials comprising biodegradable or bio-soluble polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/064—The fibres being mixed
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

Definitions

  • the present invention relates to water dispersible products.
  • a water dispersible fiber sheet is provided and it is formed from at least two types of fibers: regenerated cellulose fibers, and a second fiber that is adapted to provide strength to the water dispersible fiber sheet.
  • the water dispersible fiber sheet also preferably includes a water soluble binder, i.e., a binder that is adapted to lose strength upon coming into contact with water.
  • An exemplary water soluble binder is carboxymethyl cellulose (CMC).
  • CMC carboxymethyl cellulose
  • the fiber sheet is adapted to disperse upon contact with water.
  • the fiber sheet is used for labels, packaging, medical and health care products, such as wipes and identification markers, or for industrial and personal use.
  • the water dispersible fiber sheet forms part of a filter media.
  • the filter media includes a first layer formed from a water dispersible fiber sheet, and a second layer formed from a water soluble meltblown non-woven fiber web.
  • the water soluble meltblown non-woven fiber web can be formed from, for example, a polymer containing a polyether amide.
  • the filter media can be used in a variety of air filtration applications, such as vacuum filters, filter bags, face masks, organic liquid filters, and ASHRAE filtration applications.
  • the present invention also provides a method for preparing a water dispersible fiber sheet by combining regenerated cellulose fibers, a second fiber adapted to provide strength to the water dispersible fiber sheet, and a water soluble binder.
  • the sheet is then formed from the fibers and the binder, preferably using standard paper-making techniques, and the sheet is adapted to disperse upon contact with water.
  • the sheet can also be combined with one or more layers of a meltblown fiber web to form a filter media.
  • FIG. 1 is a photograph of one embodiment of a water dispersible fiber sheet in the dry form according to the present invention
  • FIG. 2 is a photograph of the water dispersible fiber sheet shown in FIG. 1 after being sprayed with water for about three (3) seconds;
  • FIG. 3 is a photograph of the water dispersible fiber sheet shown in FIG. 1 after being sprayed with water for about five (5) seconds;
  • FIG. 4 is a photograph of a pleated filter media;
  • FIG. 5 is a photograph of a heat sealed filter bag.
  • the present invention generally provides a water dispersible fiber sheet that, in an exemplary embodiment, is formed from regenerated cellulose fibers, a second fiber that is adapted to provide strength to the water dispersible fiber sheet, and a water soluble binder.
  • the fiber sheet can be formed into a variety of products including, for example, medical and health products such as packaging and labels.
  • the fiber sheet can be incorporated into a filter media.
  • the fiber sheet is particularly advantageous in that it is readily dispersible upon contact with water, yet it will retain its strength when used with non-aqueous fluids, such as alcohol, oils, and organic solvents.
  • regenerated cellulose fibers can be used to form the fiber sheet of the present invention. Suitable types of regenerated cellulose fibers include, for example, viscose rayon, cuprammonium rayon, high wet modulus rayon, polynosic rayon, saponified acetate, and cellulose triacetate. In one embodiment, the regenerated cellulose fibers can be present in the fiber sheet in the range of about 20% to 90% by weight.
  • the regenerated cellulose fibers are present in the fiber sheet in the range of about 30% to 70% by weight.
  • the fibers are preferably relatively short, and in particular they preferably have a length in the range of about 1 mm to 10 mm. This allows the fibers to disperse more readily when placed into contact with water.
  • the second fiber used to form the fiber sheet can also be present in a variety of forms. In an exemplary embodiment, however, the second fiber is a natural fiber that is biodegradable.
  • the second fiber can, however, also include synthetic fibers.
  • Natural fibers such as softwood fibers and hardwood fibers are preferred, but other suitable fibers include, for example, synthetic fibers such as polyethylene terephthalate fibers, nylon fibers, polyolefin fibers, synthetic wood pulp fibers, polyvinyl alcohol fibers, acrylic fibers, modacrylic fibers, vinyl chloride fibers, vinylidene chloride fibers, acetate fibers, regenerated protein fibers, polylactide fibers, poly(lactide-co-glycolide) fibers, glass fibers, ceramic fibers, metal fibers, mineral fibers, and combinations thereof.
  • synthetic fibers such as polyethylene terephthalate fibers, nylon fibers, polyolefin fibers, synthetic wood pulp fibers, polyvinyl alcohol fibers, acrylic fibers, modacrylic fibers, vinyl chloride fibers, vinylidene chloride fibers, acetate fibers, regenerated protein fibers, polylactide fibers, poly(lactide-co-glycolide) fibers, glass fiber
  • the second fiber is effective to provide tensile strength and/or to control the density of the sheet.
  • the second fiber can be present in the fiber sheet in the range of about 10% to 75% by weight, and more preferably the second fiber includes natural fibers that are present within the sheet in the range of about 10% to 80% by weight, and synthetic fibers that are present within the sheet in the range of about 0% to 50% by weight.
  • the second fiber is present in the fiber sheet in the range of about 30 to 60% by weight.
  • the size of the second fiber can also vary, especially for the natural fibers.
  • the second fiber has a diameter that is in the range of 0.1 ⁇ to 100 ⁇ , and more preferably that is in the range of about 0.3 ⁇ to 70 ⁇ , and most preferably that is in the range of about 0.3 ⁇ to 40 ⁇ , and they have a length that is in the range of about 0.1 mm to 6 mm.
  • the second fiber can also have a length to diameter ratio that is less than about 1000, and more preferably that is less than about 500, and most preferably that is less than about 200.
  • the fiber sheet also includes a binder that is effective to bind the regenerated cellulose fibers and the second fiber to one another.
  • a binder that is effective to bind the regenerated cellulose fibers and the second fiber to one another.
  • binders include, for example, carboxylmethyl cellulose (CMC), polyvinyl alcohol, protein, polyethylene oxide, polyacrylic acid, starches, gums and combinations thereof.
  • CMC carboxylmethyl cellulose
  • the binder should be present within the fiber sheet in the range of about 0.05% to 10% by weight.
  • the binder is water soluble sodium CMC, which has ideal adsorption, adhesion, water binding, film forming, viscosifying, and dispersing properties.
  • An exemplary water soluble CMC binder is manufactured by Hercules
  • the water dispersible fiber sheet can include a variety of other components, in addition to the regenerated cellulose fibers, the second fiber, and the binder.
  • the fiber sheet can include wetting agents, additives, mineral fillers such as titanium oxide, calcium carbonate, silica and silicates. While the amount of wetting agent present in the composition will vary depending on the type of wetting agent and the composition of the fiber sheet, in an exemplary embodiment the wetting agent is present in the range of about 0.01% to 1.0% by weight.
  • a suitable wetting agent is sulfonated oil.
  • a variety of techniques can be used to form a water dispersible fiber sheet in accordance with the present invention, but preferably the regenerated cellulose fibers, the second fiber, e.g., hardwood and/or softwood fibers, and the binder are all combined and formed into a fiber sheet using standard paper-making techniques.
  • the binder can be added to the fiber sheet using a beater-addition process, or it can be coated, sprayed, saturated or foamed saturated onto the fiber sheet during formation of the sheet.
  • the fiber sheet can be formed into a variety of products including, for example, labels, packaging, components for medical, personal and industrial use, embroidery backing, paper bags, printing and/or writing paper, decorative paper, pouches, alcohol wipes, polishing wipes, industrial wipes, automotive and aerospace wipes, filters, fragrance sheets for bathing, publication inserts, seeding beds, cotton swabs, test paper, backing paper, toiletries, paper core, paper box, wipes, applicators and strips for health care, cosmetic and personal care, home care wipes, packaging for baby, adult diapers and feminine hygiene, etc.
  • the water dispersible fiber sheet has a breaking strength when dry of about 8 lb/in, but the sheet is adapted to disperse upon coming into contact with water such that it has no breaking strength when wet.
  • FIGS. 1-3 show a dry fiber sheet
  • FIG. 2 shows the sheet after being spraying with water for less than 3 seconds
  • FIG. 3 shows the sheet after being spray with water for about 5 seconds.
  • the fibers in the sheet begin to disperse after 3 seconds, and the sheet falls apart after 5 seconds. This is particularly advantageous in that it allows the user to simply place the sheet into contact with water.
  • the water dispersible fiber sheet can be incorporated into a filter media to form a water dispersible filter media.
  • the filter media can have a variety of .configurations, and it can be formed using any number of layers of fiber webs formed from various polymeric materials
  • the filter media includes a first layer formed from a water dispersible fiber sheet as previously described, and a second layer formed a water soluble non-woven meltblown polymer fiber web.
  • the first and second layers can be mated to one another using a variety of techniques known in the art, but in an exemplary embodiment the layers are adhered together using a water soluble adhesive, such as a water soluble polymer.
  • the non-woven meltblown polymer fiber web can be formed from virtually any water soluble polymeric material.
  • the non-woven polymer fiber web is formed from a water soluble polyether amide.
  • One method for producing the polyether amide is by reacting at least one polyalkylene glycol diamine with at least one dicarboxylic acid or ester.
  • the polyalkylene glycol diamine preferably has the formula NH2-(CH2)x-(OCH2-CH2)y-0-(CH2)Ox-NH2, where x ranges from 2 to 3 and y ranges from 1 to 2.
  • An exemplary water soluble polyether amide resin for use with various embodiments of the present invention is HydromeltTM, available from H.B. Fuller, Inc.
  • the resin can be formed into a non-woven meltblown polymer fiber web by extruding the resin into fibers.
  • An exemplary process for forming a meltblown polymer fiber web is described in more detail in U.S. Patent No. 6,780,226, which is incorporated herein by reference in its entirety.
  • the fibers are meltblown onto the first layer, i.e., the water dispersible fiber sheet, which functions as a support layer for the meltblown fibers.
  • the resulting fiber web can be comprised of fibers having a relatively broad distribution of fiber diameters, and the fiber diameter can be adjusted during the extrusion process to form a filter media having a desired filtration efficiency as needed based on the intended use.
  • the average fiber diameter can be in the range of about 5 ⁇ to 20 ⁇ , and more preferably about 1 ⁇ to 15 ⁇ .
  • the basis weight of the meltblown polymer fiber web can also vary, especially considering the intended application. In general, higher web basis weights yield better filtration, but there exists a higher resistance, or pressure drop, across the filter barrier when the filter media has a higher basis weight. For most 2 2 applications, the basis weight can be in the range of about 10 g/m to 520 g/m , and 2 2 more preferably from about 30 g/m to 200 g/m .
  • One of ordinary skill in the art can readily determine the optimal web basis weight, considering such factors as the desired filter efficiency and permissible levels of resistance.
  • the number of plies of the polymer fiber web used in any given filter application can also vary. Each ply of the polymer fibrous web can be of a different fiber diameter. One of ordinary skill in the art can readily determine the optimal number of plies to be used. The following non-limiting examples serve to further illustrate the present invention.
  • EXAMPLE 1 A cellulose binder spray was made with 1889g of Hercules Aqualon® CMC in 50 gallons of water. The solution was mixed until the CMC was completely dissolved. Trax H-10 wetting agent, produced by Nippon Yushi, was then added to the solution, which was set aside. 8 lbs.
  • the resulting fiber sheet had a basis weight of about 32 lb/ 3000 ft 2 , a thickness of about 0.012 in., a tensile strength of about 8 lb/in, and a peak elongation of about 1.6%.
  • EXAMPLE 2 A first layer was formed by combining 30 lbs. of Primacell eucalyptus pulp, 6 lbs. of Prince George bleached softwood pulp, 12 lbs. of Minifiber Rayon 0.8 denier x 2 mm, 18 lbs. of Diawabo Rayon 0.6 denier x 3 mm, and 50 lbs. of Hercules Aqualon® CMC in 1500 gallons of water.
  • the fiber mixture was then passed through a fourdrinier paper machine and dried to form a water dispersible fiber sheet having a basis weight of 60 g/m 2 .
  • a second layer of a water soluble non-woven meltblown polymer fiber web was then formed by meltblowing H.B. Fuller Hydromelt NP2116 onto the first layer.
  • the basis weight of the second layer was 40 g/m 2 .
  • the resulting filter media is referred to below as Sample 1.
  • the above process was repeated to form a second filter media, referred to below as Sample 2, having a first layer with a basis weight of 60 g/m 2 and a second layer with a basis weight of 80 g/m 2 .
  • Table 1 illustrates the resulting properties of the first layer, Sample 1, and Sample 2.
  • the filter media can optionally be formed into a pleated filter, as shown in Figure 4, or it can be formed into a filter bag by heat seat, as shown in Figure 5.
  • EXAMPLE 3 A water dispersible paper was formed by combining 30 lbs. of Primacell eucalyptus pulp, 6 lbs. of Prince George bleached softwood pulp, 12 lbs. of Minifiber Rayon 0.8 denier x 2 mm, 18 lbs. of Diawabo Rayon 0.6 denier x 3 mm, and 50 lbs. of Hercules Aqualon® CMC in 1200 gallons of water. The fiber mixture was then passed through a fourdrinier paper machine and dried to form a water dispersible fiber sheet having a basis weight of 60 g/m 2 . The resulting sheet has a tensile in excess of 4 lbs./in and it can be easily processed using a paper converting process, such as printing, die cutting, sheeting, etc. The resulting sheet can be easily dispersed in water within 20 seconds.
  • EXAMPLE 4 A water dispersible paper was formed by combining 30 lbs. of Primacell eucalyptus pulp, 6 lbs. of Prince George bleached softwood pulp, 12 lbs. of Minifiber Rayon 0.8 denier x 2 mm, 18 lbs. of Diawabo Rayon 0.6 denier x 3 mm, and 50 lbs. of Hercules Aqualon® CMC in 1200 gallons of water. The fiber mixture was then passed through a fourdrinier paper machine and dried to form a water dispersible fiber sheet having a basis weight of 60 g/m 2 . The paper was sprayed with an Eastman AQ copolyester having an intrinsic viscosity of about 0.2. The AQ copolyesters are soluble in water, but they are not soluble in saline or body fluids. The resulting paper can be used for hospital wipes, after which they can be placed in water and eventually dissolved for disposal.
  • EXAMPLE 5 A water dispersible paper was formed by combining 30 lbs. of Primacell eucalyptus pulp, 6 lbs. of Prince George bleached softwood pulp, 12 lbs. of Minifiber
  • the fiber mixture was then passed through a fourdrinier paper machine and dried to form a water dispersible fiber sheet having a basis weight of 60 g/m 2 .
  • the fiber sheet is then laminated to another layer of paper using an adhesive, such as Hydromelt NP2116.
  • the adhesive can be coated onto the paper at a weight ranging from 0.1 g/m 2 to 20 g/m 2 .
  • the resulting paper can be formed into a disposal bag, such as a shopping bag, leaf bag, or commercial bags for powder, pellets, flakes and granular materials such as sugar, chemicals, resin, etc. After use, the bag can be disposed of in the environment where exposure to rain and moisture will dissolve the bag. The bag can also easily be recycled into a usable fiber in the paper making process.
  • a disposal bag such as a shopping bag, leaf bag, or commercial bags for powder, pellets, flakes and granular materials such as sugar, chemicals, resin, etc.
  • the bag can be disposed of in the environment where exposure to rain and moisture will dissolve the bag.
  • the bag can also easily be recycled into a usable fiber in the paper making process.
  • EXAMPLE 6 Several samples of water dispersible papers were formed from 2.41 grams of Primacell eucalyptus pulp, 0.48 grams of Prince George bleached softwood pulp, 2.41 grams of Minifiber Rayon 0.8 denier x 2 mm in 1000 ml of water, along with various amounts
  • the CMC of different degrees of substitution and molecular weight, and levels was either added to the mixture, passed through a handsheet mold, and dried to form a water dispersible fiber sheet, or it was sprayed onto the sheet after the sheet was formed and dried to form a water dispersible fiber sheet.
  • the samples were vacuumed and dried on photodryers, and the resulting samples were tested for tensile strength using a tensile machine which showed results of about 1.5 to 3 lb./in..
  • the basis weight was 35 lb./SOOOft 2 .
  • the dispersing time was measured by the time it takes for a 2 inch strip to tear apart from being sprayed by a spray bottle three inches away. The results are listed below in Table 2.
  • EXAMPLE 7 A water dispersible paper was formed by combining 40% eucalyptus pulp, 10% softwood pulp, 50% of Minifiber Rayon 0.8 denier x 2 mm and passing the mixture through a fourdrinier paper machine. The resulting sheet was saturated with CMC with a basis weight of 35 lb./3000 ft 2 . The original caliper or thickness of the sheet was 0.0083 inches, and with calendaring a caliper of 0.0021 inches could be achieved. Table 3 shows the calendaring conditions and the resulting caliper. The caliper reduction can be as high as 5 to 1. TABLE 3
  • EXAMPLE 8 A water dispersible paper was formed by combining 47.5% eucalyptus pulp, 5% softwood pulp, 47.5% of Minifiber Rayon 0.8 denier x 2 mm. The composition was saturated with CMC with a basis weight of 35 lb ./3000ft 2 , and then passed through a handsheet mold. Table 4 shows that with an increasing level of CMC-7MT added to the composition before it is formed into a sheet and/or sprayed onto the resulting sheet after it is formed, the tensile strength increases but the dispersion time remains less than 6 seconds.
  • EXAMPLE 9 A water dispersible paper was formed by various combinations of eucalyptus pulp, softwood pulp and rayon fibers of different deniers for the base composition. The pulp can also be refined to a lower Canadian Standard Freeness (CSF) such as the Prince George pulp at 600 CSF. The composition was passed through a handsheet mold. A 1.5% CMC solution was made up with various CMC, such as Aqualon® CMC-7MT, Noviant Finnfix® 30G, 300 and 700. The compositions was saturated with CMC to a basis weight of 38 lb./3000 ft 2 . Table 5 shows the type and level of both pulp and CMC solution.
  • CSF Canadian Standard Freeness
  • Dispersion Time Test A which is the time it takes for the sample to fall apart while hand spraying a strip of about 1" x 2" sample with cold water from about 3 inches away
  • Dispersion Time Test B which is the time it takes for a 1 " x 1 " sample to fall apart in 300 ml of water using a VWR Dynadual® 942009 magnetic stir plate and a magnetic stir rod at a stir setting of 5.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention a trait à des produits à base de fibres pouvant se disperser dans l'eau. Dans un mode de réalisation, l'invention concerne une feuille de fibres pouvant se disperser dans l'eau, et est formée de préférence de fibres de cellulose régénérée, de secondes fibres qui sont adaptées pour rendre la feuille de fibres pouvant se disperser dans l'eau plus résistante, et un liant hydrosoluble. La feuille de fibres selon l'invention peut servir à former une multitude de produits, notamment, par exemple, des étiquettes, des produits d'emballage, des produits médicaux et d'hygiène. La feuille de fibres selon l'invention est particulièrement avantageuse en ce qu'elle peut être facilement dispersée lorsqu'elle est mise en contact avec de l'eau, et en ce qu'elle conserve sa résistance lorsqu'elle est utilisée avec d'autres fluides, tels que de l'alcool et des huiles. La biodégradabilité de la feuille de fibres permettra également aux fibres d'être consommées de façon naturelle par des bactéries présentes dans l'environnement, ce qui rend inutile tout recours à des procédures d'élimination spéciales. Dans un autre mode de réalisation, la feuille de fibres pouvant se disperser dans l'eau peut être incorporée dans un milieu filtrant.
PCT/US2004/036232 2003-10-29 2004-10-29 Produits pouvant se disperser dans l'eau WO2005042631A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002543015A CA2543015A1 (fr) 2003-10-29 2004-10-29 Produits pouvant se disperser dans l'eau
EP04817498A EP1682720A4 (fr) 2003-10-29 2004-10-29 Produits pouvant se disperser dans l'eau

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51548003P 2003-10-29 2003-10-29
US60/515,480 2003-10-29

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WO2005042631A2 true WO2005042631A2 (fr) 2005-05-12
WO2005042631A3 WO2005042631A3 (fr) 2006-02-09

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EP (1) EP1682720A4 (fr)
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WO2022167728A1 (fr) * 2021-02-02 2022-08-11 Ahlstrom-Munksjö Oyj Milieu filtrant biodégradable à base de cellulose et masques faciaux le contenant
EP4403696A1 (fr) 2023-01-20 2024-07-24 Ahlstrom Oyj Feuilles non tissées biodégradables, leur procédé de fabrication et leurs utilisations
WO2024153860A1 (fr) 2023-01-20 2024-07-25 Ahlstrom Oyj Feuilles non tissées biodégradables, leur procédé de fabrication et leurs utilisations
WO2024153558A1 (fr) 2023-01-20 2024-07-25 Ellepot A/S Procédé de production de longueurs continues de bouchons de propagation, et bouchons de propagation, ou tiges produits par un tel procédé

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CA2543015A1 (fr) 2005-05-12
EP1682720A2 (fr) 2006-07-26
EP1682720A4 (fr) 2008-06-18
US20050092451A1 (en) 2005-05-05
WO2005042631A3 (fr) 2006-02-09

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