EP2464781B1 - Use of a coated microfiber web as a cover of a radiation protection material - Google Patents

Use of a coated microfiber web as a cover of a radiation protection material Download PDF

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Publication number
EP2464781B1
EP2464781B1 EP20100741954 EP10741954A EP2464781B1 EP 2464781 B1 EP2464781 B1 EP 2464781B1 EP 20100741954 EP20100741954 EP 20100741954 EP 10741954 A EP10741954 A EP 10741954A EP 2464781 B1 EP2464781 B1 EP 2464781B1
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EP
European Patent Office
Prior art keywords
radiation protection
polyurethane
fluoropolymer
microfibrous web
coated
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Application number
EP20100741954
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German (de)
French (fr)
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EP2464781A1 (en
Inventor
Thomas Leucht
Barbara Ballsieper
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Mavig GmbH
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Mavig GmbH
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/77Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof
    • D06M11/79Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with silicon or compounds thereof with silicon dioxide, silicic acids or their salts
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/244Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
    • D06M15/256Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons containing fluorine
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/263Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof
    • D06M15/277Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acids; Salts or esters thereof containing fluorine
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/21Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/285Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides
    • D06M15/295Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of unsaturated carboxylic acid amides or imides containing fluorine
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • D06M15/568Reaction products of isocyanates with polyethers
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06MTREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/19Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
    • D06M15/37Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D06M15/564Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
    • D06M15/572Reaction products of isocyanates with polyesters or polyesteramides
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06NWALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/047Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with fluoropolymers
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06NWALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06NWALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/18Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
    • D06N3/183Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials the layers are one next to the other
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00Shielding characterised by the composition of the materials
    • G21F1/02Selection of uniform shielding materials
    • G21F1/10Organic substances; Dispersions in organic carriers
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00Shielding characterised by the composition of the materials
    • G21F1/12Laminated shielding materials
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2041Two or more non-extruded coatings or impregnations
    • Y10T442/2098At least two coatings or impregnations of different chemical composition
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2041Two or more non-extruded coatings or impregnations
    • Y10T442/2098At least two coatings or impregnations of different chemical composition
    • Y10T442/2107At least one coating or impregnation contains particulate material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2164Coating or impregnation specified as water repellent
    • Y10T442/2189Fluorocarbon containing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/2262Coating or impregnation is oil repellent but not oil or stain release
    • Y10T442/227Fluorocarbon containing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/259Coating or impregnation provides protection from radiation [e.g., U.V., visible light, I.R., micscheme-change-itemave, high energy particle, etc.] or heat retention thru radiation absorption
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/20Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
    • Y10T442/259Coating or impregnation provides protection from radiation [e.g., U.V., visible light, I.R., micscheme-change-itemave, high energy particle, etc.] or heat retention thru radiation absorption
    • Y10T442/2598Radiation reflective
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608Including strand or fiber material which is of specific structural definition
    • Y10T442/614Strand or fiber material specified as having microdimensions [i.e., microfiber]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/60Nonwoven fabric [i.e., nonwoven strand or fiber material]
    • Y10T442/608Including strand or fiber material which is of specific structural definition
    • Y10T442/627Strand or fiber material is specified as non-linear [e.g., crimped, coiled, etc.]
    • Y10T442/635Synthetic polymeric strand or fiber material

Definitions

  • the present invention relates to the use of a coated microfiber web as a cover of a radiation protection material and to a radiation protection device.
  • U.S. Patent 4,923,741 discloses a flexible multi-layered cover which serves as protection against the dangers in space.
  • the cover comprises a layer which is intended to protect against bremsstrahlung, for example.
  • GB 2 118 410 A describes a radiation protection article comprising at least one flexible layer of a lead-containing material, which is covered by a fabric, fabric or nonwoven or between two layers of a knitted fabric, woven or nonwoven, wherein the fabric, fabric or nonwoven fabric, a coating of flexible polyurethane on the outer surface.
  • the present inventors have found that such Radiation protection articles, which have a polyurethane coating on the outside, are subject to a very strong abrasion when used, for example, in a medical field.
  • US 5,922,445 A discloses a sheet composite material which can be obtained by coating or impregnating a fibrous base material with an elastic polymeric substance, wherein the fibers constituting the fibrous base material and the elastic polymeric substance are prevented from bonding to each other, and which is flexible, wear-resistant and peel-resistant is.
  • the material may be prepared by applying a hydrophobing treatment to the fibrous base material, then impregnating or coating with a solution of the elastic polymeric substance to which a hydrophilic silicone has been added, and wet-setting.
  • microfiber web having improved abrasion resistance for use as a cover of a radiation protection material.
  • the microfiber web is not particularly limited. It can be any flat structure, such as fabric, knitted fabric, knitted fabric, membrane or fleece containing microfibers. Preference is given to tissue.
  • Microfibers are fibers that preferably have a fiber thickness of 0.5 dtex to 1.5 dtex, more preferably 0.3 dtex to 1.0 dtex.
  • the type of microfibers depends on the intended use. Examples of suitable types of microfibers include microfibers based on polyester, polyamide, cellulose (eg acetate or viscose) and Polytetrafluoroethylene and mixture thereof. Microfibres based on polyester and / or polyamide are particularly suitable.
  • the microfiber web may contain electrically conductive fibers to reduce electrostatic charges.
  • the electrically conductive fibers are not particularly limited. Examples of these are fibers of carbon, metal or polymer-based fibers, for example polymer fibers containing carbon or metal particles. In a preferred embodiment, polymer fibers containing carbon particles are used.
  • the electrically conductive fibers have, for example, a fiber thickness in the range from 1 dtex to 3 dtex, preferably 1.2 dtex to 2 dtex. When the diameter of the electroconductive fibers is larger (preferably 1.2 to 3 times larger, more preferably 1.2 to 2 times larger) than the diameter of the microfibers, the electroconductive fibers protrude from the tissue surface.
  • the person skilled in the art can suitably choose the amount of the electrically conductive fibers on the basis of his knowledge. It will usually contain 0.1 wt .-% to 10 wt .-%, preferably 0.5 wt .-% to 3 wt .-% of electrically conductive fibers in the microfiber web, wherein the weight percent based on the total weight of the fibers in refer to the uncoated microfiber web.
  • the finished microfiber web should have an electrostatic surface resistance of about 10 5 ohms to about 10 8 ohms (measured according to DIN 100015-1 at 25% relative humidity and 23 ° C).
  • Microfibers and the optionally present electrically conductive fibers are processed according to known methods to a microfiber web.
  • the electrically conductive fibers may be incorporated randomly or in a regular array in the microfiber web. The type of incorporation will depend on the requirements for dissipation of electrical charges as well as the process by which the microfiber web is made.
  • the electrically conductive fibers are incorporated in a regular array. They can be incorporated, for example, in a grid-like arrangement, since this arrangement derives possible electrostatic charges particularly favorable.
  • the distances between the grid lines are preferably in the range of 3 mm to 100 mm, preferably 5 mm to 75 mm, wherein the side lengths of the grid rectangles may be different from each other.
  • the air permeability of the microfiber web used as the starting material is suitably selected by a person skilled in the art according to the purpose of use.
  • the air permeability is 0 to 100 l / min per dm 2 , preferably 5 to 50 l / min per dm 2 , wherein the air permeability according to DIN EN ISO 9237 is measured.
  • the basis weight of the microfiber web used as a starting material is also suitably selected in view of the purpose of use.
  • the basis weight will usually be in the range from 50 g / m 2 to 200 g / m 2 , preferably 60 g / m 2 to 150 g / m 2 .
  • the thickness of the microfiber web used as a starting material is not particularly limited. It will usually be chosen in view of the intended use. In one embodiment, the microfiber web will have a thickness in the range of 0.05 mm to 0.20 mm, preferably 0.10 mm to 0.15 mm.
  • the microfiber web is impregnated with fluoropolymer.
  • the fluoropolymer may be a partially or perfluorinated polymer. Both homopolymers and copolymers are suitable. Fluoroalkyl acrylate homopolymers and fluoroalkyl acrylate copolymers are particularly suitable.
  • the perfluoroalkyl moiety preferably has 4 to 12 carbon atoms.
  • the optional spacer is not particularly limited, provided that it is not a perfluoroalkyl unit. It preferably has 2 to 10 atoms, more preferably 2 to 8 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer.
  • the polymerizable group is not particularly limited and may be any polymerizable group used to form a Polymers is suitable. Examples of polymerizable groups include ethylenically unsaturated groups.
  • the fluoropolymers may have further side groups, in particular alkyl-containing side groups and / or functional side groups being suitable.
  • the fluoropolymer may have alkyl-containing side groups.
  • the alkyl moiety preferably has 1 to 12 carbon atoms.
  • the optional spacer is not particularly limited, provided that it is not an alkyl moiety. It preferably has 0 to 20 atoms, more preferably 0 to 10 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer.
  • the polymerizable group is not particularly limited and may be any polymerizable group that is suitable for forming a polymer. Examples of polymerizable groups include ethylenically unsaturated groups.
  • the fluoropolymer may have pendant functional groups.
  • the functional unit is not particularly limited and may include any functional group. Examples of functional groups are OH, SH, NH 2 , N-methylolsulfonamides, etc.
  • the functional unit preferably has 0 to 20 carbon atoms, preferably 0 to 12 carbon atoms.
  • the optional spacer is not particularly limited, provided that it is not an alkyl moiety. It preferably has 0 to 20 atoms, more preferably 0 to 10 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer.
  • the polymerizable group is not particularly limited and may be any polymerizable group that is suitable for forming a polymer. Examples of polymerizable groups include ethylenically unsaturated groups.
  • fluoropolymers examples include Evoral ®, Oleophobol, Scotch Guard, Tubiguard, Repellan, Ruco-Guard, Unidyne, Quecophob and Nuva, but are not limited thereto.
  • the impregnated microfiber web preferably contains from 0.2 g to 5 g, more preferably from 0.2 g to 1.2 g, of fluoropolymer based on 100 g of microfiber web used as the starting material. If an appropriate amount of fluoropolymer is used, the coated microfiber web has long-term good water and oil repellency, adhesion to the substrate and good grip.
  • the impregnating composition may further contain adjuvants such as silicones, waxes and salts (for example, zirconium salts) if necessary.
  • adjuvants such as silicones, waxes and salts (for example, zirconium salts) if necessary.
  • a layer comprising polyurethane is applied on one side of the microfiber web. Due to the layer, which includes polyurethane, the coated microfiber web is easy to clean. Furthermore, this layer ensures tightness against water and penetration by microorganisms, such as bacteria.
  • the layer comprising polyurethane is preferably applied in the form of a continuous layer on a surface of the microfiber web.
  • the layer should have a uniform thickness. The thickness of the layer is preferably in the range of 3 g / m 2 to 50 g / m 2 , more preferably in the range of 8 g / m 2 to 20 g / m 2 .
  • Suitable polyurethanes are all polyurethane homopolymers and copolymers.
  • polyurethane block copolymers such as polyester polyurethanes and polyether polyol polyurethanes come into question.
  • the polyester and polyether polyols typically have a Molularclude from 4000 to 6000.
  • An example of a commercially available product is Impranil ®.
  • the polyurethane-containing layer may contain other ingredients in addition to polyurethane.
  • One possible ingredient is a fluororesin.
  • the fluororesin may be identical to or different from the fluoropolymer.
  • the fluororesin is preferably identical to the fluoropolymer, so that the above statements apply to the fluoropolymer.
  • the fluororesin is preferably contained in the layer in an amount of 0 to 10 parts by weight, more preferably 0.5 part by weight to 3 parts by weight, based on 100 parts by weight of polyurethane.
  • the layer comprising polyurethane may comprise further adjuvants.
  • An optional adjuvant is silica.
  • the sterilizability with gases such as ethylene oxide is improved by the addition of silicon dioxide.
  • Silica is preferably used in the form of silica in the layer.
  • the size of the silica particles is usually in the range of 0.2 ⁇ m to 10 ⁇ m, preferably 0.2 ⁇ m to 5 ⁇ m.
  • Silica is preferably contained in the layer in an amount of 0 to 10 parts by weight, more preferably 1 part to 5 parts by weight, based on 100 parts by weight of polyurethane.
  • the layer comprising polyurethane may further comprise titanium dioxide.
  • Titanium dioxide serves as a matting agent.
  • the size of the titanium dioxide particles is usually in the range of 0.2 ⁇ m to 10 ⁇ m, preferably 0.2 ⁇ m to 5 ⁇ m.
  • Titanium dioxide is preferably contained in the layer in an amount of 0 to 5 parts by weight, more preferably 0.2 part by weight to 2 parts by weight, based on 100 parts by weight of polyurethane.
  • the layer comprising polyurethane may contain further additives such as deaerators, fungicides, additives for increasing the scratch resistance, water repellents, thickeners, rheology aids, leveling agents, etc.
  • additives are either additives for the production of the layer or improve the properties of the finished layer. The person skilled in the art can choose it on the basis of his specialist knowledge.
  • the additives are preferably contained in the layer in an amount of 0 to 20 parts by weight, more preferably 0.5 part by weight to 10 parts by weight, based on 100 parts by weight of polyurethane.
  • the coated microfiber web can be produced by various methods. A preferred method will be described below.
  • microfiber web is provided.
  • the microfiber web used as the starting material has been described in detail above.
  • the microfiber web can be used as such in the process. However, if desired, it may be subjected to a pretreatment, for example to increase the hydrophilicity.
  • the pretreatment for example to increase the hydrophilicity, can be carried out by methods known in the art.
  • the hydrophilicity-enhancing agent there may be used nonionic surfactants, fatty acid condensates, silicones and mixtures thereof.
  • the hydrophilicity enhancers are applied to the microfiber web.
  • the application method is not particularly limited.
  • the microfiber web is contacted (for example, by spraying, dipping, etc.) with a solution or dispersion of the hydrophilicity enhancer.
  • the resulting microfiber web is preferably dried.
  • the exact drying conditions will depend on the hydrophilicizing agent used. Usually, a drying temperature of 40 ° C to 80 ° C, preferably from 50 ° C to 60 ° C, can be selected.
  • the drying time is usually from 30 seconds to 240 seconds, preferably from 60 seconds to 120 seconds.
  • the microfiber web before the impregnation step has a liquor pickup for the fluoropolymer of from 65 wt% to 85 wt%, stronger preferably from 65 wt .-% to 70 wt .-%, based on the dry weight of the optionally pretreated microfiber web.
  • microfiber web is impregnated with an impregnation composition comprising fluoropolymer.
  • fluoropolymer Suitable fluoropolymers are described above.
  • microfiber web is impregnated by known methods. These methods include spraying, dipping, exhaustion, paddling, and foam impregnation. Dipping impregnation is preferred because it allows complete impregnation of the microfiber web.
  • the fluoropolymer is usually used in the form of a solution or dispersion.
  • concentration of the solution or dispersion is not particularly limited, and is preferably in the range of 5 g / L to 70 g / L, more preferably in the range of 5 g / L to 50 g / L.
  • the impregnated microfiber web is dried.
  • the present inventors have found that the properties of fluoropolymer impregnations can be influenced by a suitable sequence of drying and thermal treatment. Without wishing to be bound by any particular theory, they believe that the molecules of the fluoropolymer initially settle randomly on a substrate (such as the present microfiber web) when the solvent is removed. Due to the statistical (ie disordered) arrangement, the hydrophobic fluorine atoms are initially also statistically distributed. When the fluoropolymer is exposed to a higher temperature, comes it leads to a reorientation of the molecules of the fluoropolymer, wherein the hydrophobic fluorine atoms are preferably arranged on the surface of the layer.
  • a test fabric of cotton EMPA 210, plain weave, bleached, without optical brightener (source EMPA Test Materials AG, St. Gallen, Switzerland) is impregnated by padding with 0.5 g of fluoropolymer per 100 g of cotton fabric and dried at room temperature.
  • the fabric is then cut into pieces of equal size.
  • the pieces are then heated at different temperatures for 120 s (eg 40 ° C, 50 ° C, Across, 140 ° C, 150 ° C), the temperature difference between the individual steps being 10 ° C.
  • the exact minimum and maximum temperature depends on the fluoropolymer and can be determined from the measured waveform.
  • the weight of the respective piece of fabric which has been heated at the temperature T i is measured (T i ).
  • the fabric pieces are padded with an aqueous liquor at 2 bar pressure and 1.5 m / min roller speed.
  • the weight of the respective piece of fabric which has been heated at the temperature T i wet (T i ) is measured.
  • the drying temperature should be selected to be in the range where the relatively constant high liquor pickup is is obtained.
  • the temperature of the thermal treatment should be selected to be within the range for which the relatively constant low liquor pickup is obtained. The transition area between the two zones is less suitable.
  • the liquor pick-up when drying is at least 20%. In general, the liquor pick-up, when in thermal treatment, will be at most 10%.
  • these figures are only guidelines and may vary depending on the fluoropolymer.
  • step (c) the impregnated microfiber web is dried.
  • the molecules of the fluoropolymer deposit statistically on the microfiber web.
  • the drying conditions are chosen so that there is no reorientation of the molecules of the fluoropolymer.
  • the exact drying conditions depend on the fluoropolymer used. Usually, a drying temperature of 40 ° C to 110 ° C, preferably from 50 ° C to 80 ° C, is selected. The drying time is usually from 10 s to 240 s, preferably from 30 s to 120 s.
  • Impregnation with the fluoropolymer sets the absorbency of the microfiber web. By merely drying the fluoropolymer, it is easier to ensure that the polyurethane coating composition does not penetrate the entire microfiber web. If the fluoropolymer were to be thermally treated prior to the application of the polyurethane coating composition so that the molecules of the fluoropolymer would orient themselves, the repellent surface would make subsequent coating with the coating composition more difficult.
  • the microfiber web has a liquor pickup for the coating composition of from 30% to 60%, more preferably from 30% to 50% by weight, based on dry weight of the impregnated microfiber web ,
  • the coating composition comprising polyurethane is applied to only one side of the dried, impregnated microfiber web.
  • the constituents of the layer comprising polyurethane have been described in detail above.
  • the coating composition is preferably used in the form of a solution or dispersion of the desired ingredients.
  • concentration of the polyurethane in the solution or dispersion is preferably in the range of 50 wt% to 80 wt%, more preferably 60 wt% to 80 wt%.
  • the coating composition is applied to the dried, impregnated microfiber web by known methods. These methods include roll coating, knife coating, knife coating, foam coating, transfer coating, and film drawing, preferably doctoring is used.
  • FIG. 1 shows a schematic representation of the cross section of a finished coated microfiber web, the microfiber layer is shown for simplicity as a monolayer.
  • the microfiber web (1) comprises microfibers (2) and electrically conductive fibers (3), in which embodiment the diameter of the electrically conductive fibers (3) is greater than the diameter of the microfibers (2).
  • the fluoropolymer impregnation is not shown in this figure.
  • the layer (4) comprising polyurethane is only present on one side of the finished microfiber web.
  • the thicknesses can be measured by optical methods such as microscopy.
  • optical methods such as microscopy.
  • An example of a possible measuring method is the investigation of a cross section by means of scanning electron microscopy.
  • the degree of penetration is in FIG. 1 pictorially indicated by the right curly bracket and the indication "x%". In FIG. 1 it is about 50%, because the microfibers (white balls) are about 50% embedded in the layer that includes polyurethane.
  • the coating composition may be dried after application in step (d). Alternatively, the drying may be dispensed with and the coating composition dried in the course of the thermal treatment in step (e).
  • the conditions are chosen depending on the chosen coating composition. However, they should be chosen so that there is no reorientation of the molecules of the fluoropolymer.
  • a drying temperature of 40 ° C to 110 ° C, preferably from 80 ° C to 100 ° C, can be selected.
  • the drying time is usually from 10 s to 240 s, preferably from 10 s to 120 s.
  • step (e) thermally treating the coated microfiber web obtained in step (d)
  • step (e) the (optionally dried) coated microfiber web obtained in step (d) is thermally treated.
  • the conditions are chosen so that there is a reorientation of the molecules of the fluoropolymer.
  • a temperature of 120 ° C to 190 ° C, preferably from 140 ° C to 180 ° C is usually selected. It is of course possible to carry out the thermal treatment in several stages with different temperatures.
  • the duration of the thermal treatment is usually from 10 s to 240 s, preferably from 30 s to 120 s.
  • the coated microfiber web may be used as a cover of a radiation protection material in a radiation protection device, wherein the coated microfiber web is applied to at least one side of the radiation protection material and wherein the polyurethane coated side is adjacent to the radiation protection material.
  • FIG. 2 shows a schematic representation of a cross section of the radiation protection device (6) according to the invention.
  • the microfiber web (1) comprises microfibers (2) and electrically conductive fibers (3), in which embodiment the diameter of the electrically conductive fibers (3) is greater than the diameter of the microfibers (2).
  • the fluoropolymer impregnation is not shown in this figure.
  • the layer (4) comprising polyurethane is present only on one side of the finished microfiber web (1).
  • the microfiber web (1) is applied to both sides of the radiation protection material (5), wherein the layer (4) comprising polyurethane is in each case adjacent to the radiation protection material (5).
  • radiation protection devices all devices which protect persons or objects from harmful radiation, in particular X-radiation, UV radiation, infrared radiation, and radioactive radiation, particularly preferably X-radiation.
  • examples include, but are not limited to, aprons, gloves, umbrellas, curtains, coats, drapes, draping materials, eye protection products and overcoats. Due to its flexibility and its pleasant haptic properties, the coated microfiber web is particularly suitable for flexible radiation protection devices and / or radiation protection devices that are worn by people.
  • the type of the radiation protection material will depend on the radiation to be shielded and is not particularly limited. By way of example, radiation protection material based on lead or lead oxide can be mentioned. Lead-free radiation protection material can also be used. Lead-free radiation protection material is, for example, in DE 10 2004 001 328 A . WO 2005/024846 A . WO 2005/023116 A . DE 10 2006 028 958 A . WO 2004/017332 A and DE 10 2005 034 384 disclosed. Combinations of radiation protection material are also possible.
  • the radiation protection material may comprise one or more layers.
  • the coated microfiber web is applied to at least one side of the radiation protection material.
  • the radiation protection material is enveloped by the coated microfiber web.
  • the microfiber web and the radiation protection material can be joined together in a known manner, for example by sewing, gluing, taping, laminating or laminating.
  • the microfiber web and the radiation protection material are processed into a composite material, for example by lamination or lamination, they can subsequently also be processed by means of confectioning processes, such as cutting, Punching, water jet cutting, molding or laser beam cutting are processed to the final products.
  • the coated microfiber web Due to its textile character, the coated microfiber web also gives the radiation protection devices a pleasant surface feel, which, in particular, gives garments a pleasant wearing comfort.
  • the coated microfiber web is arranged so that the polyurethane-coated side is adjacent to the radiation protection material.
  • the polyurethane-coated side is thus turned outwards and thus exposed to strong physical loads. This leads to increased closure and abrasion.
  • the inventive arrangement in which the polyurethane coated side faces inwards, the physical load is much lower.
  • the coated microfiber web has a high cutting and tear resistance, so that its service properties are clearly superior to those of conventional materials.
  • the microfiber web was made from polyester microfibers having a fiber density of 1 dtex and carbonaceous fibers (Belltron B31, available from Kanebo Gohsen Ltd., Japan).
  • the fibers were made into a canvas with about 70 warp threads / cm and about 37 weft threads / cm with a basis weight of 100 g / m 2 .
  • the carbonaceous electroconductive fibers were incorporated in the form of a grid measuring 5 ⁇ 5 mm.
  • the microfiber web had an air permeability of about 15 l / min per dm 2 and an electrostatic surface resistance of about 1 x 10 8 ohms (according to DIN 100015-1 at 25% relative humidity and 23 ° C).
  • the tensile strengths were about 850 N in warp and about 650 N in the weft.
  • the microfiber web was passed over a tenter.
  • Silastol WK available from Schill + Seilacher, DE
  • microfiber web was impregnated by padding with 10 g / l Evoral O 35 (fluoropolymer, available from the company Schill + Seilacher, DE).
  • Evoral O 35 fluoropolymer, available from the company Schill + Seilacher, DE.
  • the microfiber web was dried at 60 ° C. for 90 s. There was no orientation of the molecules of the fluoropolymer.
  • the applied amount of Evoral was about 0.7 g / 100 g microfiber web.
  • the coating composition had the following composition: 50 parts Impranil DLP-R, Bayer (polymer dispersion) 0.2 parts Agitan 218, Münzing Chemie (deaerator) 0.4 parts Afrotin FG, Schill + Seilacher (fungicide) 0.4 parts Byk 333, Byk Chemie (Additive for increasing scratch resistance) 0.8 parts Tegophobe 1650, Degussa (water repellent) 1.2 parts colloidal silica 41.7 parts water 0.3 parts Rheolate 255, Elementis (thickener) 4.2 parts Evoral, Schill + Seilacher (Fluoropolymer) 0.8 parts Hombitec RM 400, Sachtleben chemistry (matting agent)
  • the addition was carried out by adding in the above-mentioned order with the aid of a dissolver.
  • the stirring time was 35 minutes.
  • the paste produced was applied by means of an air knife surface as a closed film on the microfiber web.
  • the coated microfiber web was dried stepwise in a tenter frame in five 3 m long sections for a total of 2 minutes. Drying field 1: 80 ° C Drying field 2: 120 ° C Drying fields 3 to 5: 160 ° C
  • microfiber web was examined in accordance with DIN EN 13795-2 in order to clarify its suitability as a cover for X-ray protective material in the OR area.
  • KbE colony-forming units
  • the measured values show that the material can be used excellently as a textile in the surgical area.
  • Example 1 of WO 2005/024846 manufactured lead-free radiation protection material was cut in the form of a radiation protection apron.
  • the coated microfiber web prepared above was cut to size and placed on both sides of the radiation protection material with the polyurethane-coated side facing the radiation protection material.
  • the microfiber webs and the radiation protection material were sewn together, so that a radiation protection apron was obtained.
  • the radiation protection apron mediated by the use of the described microfiber web a comfortable fit. Skin irritation was avoided.
  • the described microfiber web serves as a protective barrier for the sensitive radiation protection inlay.
  • the radiation protection apron had an excellent tightness against blood, urine and microorganisms. It also could be sterilized without damage from ethylene oxide. Consequently, the radiation protection apron is very well suited for use in the medical field.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Laminated Bodies (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Description

Technisches GebietTechnical area

Die vorliegende Erfindung betrifft, die Verwendung einer beschichteten Mikrofaserbahn als Abdeckung eines Strahlenschutzmaterials sowie eine Strahlenschutzvorrichtung.The present invention relates to the use of a coated microfiber web as a cover of a radiation protection material and to a radiation protection device.

Technischer HintergrundTechnical background

US-Patent 4,923,741 offenbart eine flexible mehrschichtige Abdeckung, die als Schutz gegen die Gefahren im Weltall dient. Die Abdeckung umfasst unter anderem eine Schicht, die beispielsweise gegen Bremsstrahlung schützen soll. U.S. Patent 4,923,741 discloses a flexible multi-layered cover which serves as protection against the dangers in space. Among other things, the cover comprises a layer which is intended to protect against bremsstrahlung, for example.

GB 2 118 410 A beschreibt einen Strahlenschutzgegenstand, der mindestens eine flexible Schicht eines bleihaltigen Materials umfasst, das von einem Gestrick, Gewebe oder Vlies umhüllt ist bzw. zwischen zwei Lagen eines Gestricks, Gewebes oder Vlieses eingefasst ist, wobei das Gestrick, Gewebe oder Vlies eine Beschichtung aus flexiblem Polyurethan auf der äußeren Oberfläche aufweist. Die vorliegenden Erfinder haben jedoch gefunden, dass derartige Strahlenschutzgegenstände, die eine Polyurethanbeschichtung auf der Außenseite aufweisen, einen sehr starkem Abrieb unterliegen, wenn sie beispielsweise in einem medizinischen Bereich verwendet werden. GB 2 118 410 A describes a radiation protection article comprising at least one flexible layer of a lead-containing material, which is covered by a fabric, fabric or nonwoven or between two layers of a knitted fabric, woven or nonwoven, wherein the fabric, fabric or nonwoven fabric, a coating of flexible polyurethane on the outer surface. However, the present inventors have found that such Radiation protection articles, which have a polyurethane coating on the outside, are subject to a very strong abrasion when used, for example, in a medical field.

US 5,922,445 A offenbart ein flächiges Verbundmaterial, das durch Beschichten oder Imprägnieren eines faserförmigen Grundmaterials mit einer elastischen polymeren Substanz erhalten werden kann, wobei die Fasern, die das faserförmige Grundmaterial bilden, und die elastische polymere Substanz am Verbinden miteinander gehindert werden, und welches flexibel, verschleißfest und schälfest ist. Das Material kann durch Aufbringen einer hydrophobierenden Behandlung auf das faserförmige Grundmaterial, dann Imprägnieren oder Beschichten mit einer Lösung der elastischen polymeren Substanz, der ein hydrophiles Silikon zugesetzt wurde, und Nassverfestigen hergestellt werden. US 5,922,445 A discloses a sheet composite material which can be obtained by coating or impregnating a fibrous base material with an elastic polymeric substance, wherein the fibers constituting the fibrous base material and the elastic polymeric substance are prevented from bonding to each other, and which is flexible, wear-resistant and peel-resistant is. The material may be prepared by applying a hydrophobing treatment to the fibrous base material, then impregnating or coating with a solution of the elastic polymeric substance to which a hydrophilic silicone has been added, and wet-setting.

Demgemäß war es eine Aufgabe der vorliegenden Erfindung eine Mikrofaserbahn, welche eine verbesserte Abriebfestigkeit aufweist, zur Verwendung als Abdeckung eines Strahlenschutzmaterials bereitzustellen.Accordingly, it was an object of the present invention to provide a microfiber web having improved abrasion resistance for use as a cover of a radiation protection material.

Zusammenfassung der ErfindungSummary of the invention

In einer Ausführungsform betrifft die vorliegende Erfindung die Verwendung einer beschichteten Mikrofaserbahn, umfassend:

  1. (i) eine Mikrofaserbahn, die mit einem Fluorpolymer imprägniert ist; und
  2. (ii) eine Schicht, die Polyurethan umfasst, welches nur auf einer Seite der Mikrofaserbahn vorhanden ist,
oder einer beschichteten Mikrofaserbahn, die gemäß dem Verfahren erhältlich ist, welches die folgenden Schritte umfasst:
  1. (a) Bereitstellen einer Mikrofaserbahn;
  2. (b) Imprägnieren der Mikrofaserbahn mit einer Imprägnierungszusammensetzung, die Fluorpolymer umfasst;
  3. (c) Trocknen der imprägnierten Mikrofaserbahn;
  4. (d) Aufbringen einer Beschichtungszusammensetzung, die Polyurethan umfasst, auf nur einer Seite der getrockneten, imprägnierten Mikrofaserbahn; und
  5. (e) thermisches Behandeln der in Schritt (d) erhaltenen beschichteten Mikrofaserbahn,
als Abdeckung eines Strahlenschutzmaterials, wobei die beschichtete Mikrofaserbahn auf mindestens einer Seite des Strahlenschutzmaterials aufgebracht ist und wobei die mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial benachbart ist.In one embodiment, the present invention relates to the use of a coated microfiber web, comprising:
  1. (i) a microfiber web impregnated with a fluoropolymer; and
  2. (ii) a layer comprising polyurethane present on only one side of the microfiber web,
or a coated microfiber web obtainable according to the process comprising the following steps:
  1. (a) providing a microfiber web;
  2. (b) impregnating the microfiber web with an impregnation composition comprising fluoropolymer;
  3. (c) drying the impregnated microfiber web;
  4. (d) applying a coating composition comprising polyurethane on one side only of the dried, impregnated microfiber web; and
  5. (e) thermally treating the coated microfiber web obtained in step (d),
as a cover of a radiation protection material, wherein the coated microfiber web is applied to at least one side of the radiation protection material and wherein the polyurethane-coated side is adjacent to the radiation protection material.

In einer anderen Ausführungsform der Erfindung wird eine Strahlenschutzvorrichtung beansprucht, die

  • (α) ein Strahlenschutzmaterial; und
  • (β) eine beschichtete Mikrofaserbahn, umfassend
    1. (i) eine Mikrofaserbahn, die mit einem Fluorpolymer imprägniert ist; und
    2. (ii) eine Schicht, die Polyurethan umfasst, welches nur auf einer Seite der Mikrofaserbahn vorhanden ist,
    oder eine beschichtete Mikrofaserbahn, die gemäß dem Verfahren erhältlich ist, welches die folgenden Schritte umfasst:
    1. (a) Bereitstellen einer Mikrofaserbahn;
    2. (b) Imprägnieren der Mikrofaserbahn mit einer Imprägnierungszusammensetzung, die Fluorpolymer umfasst;
    3. (c) Trocknen der imprägnierten Mikrofaserbahn;
    4. (d) Aufbringen einer Beschichtungszusammensetzung, die Polyurethan umfasst, auf nur einer Seite der getrockneten, imprägnierten Mikrofaserbahn; und
    5. (e) thermisches Behandeln der in Schritt (d) erhaltenen beschichteten Mikrofaserbahn,
    wobei die beschichtete Mikrofaserbahn auf mindestens einer Seite des Strahlenschutzmaterials aufgebracht ist und wobei die mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial benachbart ist.
In another embodiment of the invention, a radiation protection device is claimed which
  • (α) a radiation protection material; and
  • (β) a coated microfiber web comprising
    1. (i) a microfiber web impregnated with a fluoropolymer; and
    2. (ii) a layer comprising polyurethane present on only one side of the microfiber web,
    or a coated microfiber web obtainable according to the process comprising the following steps:
    1. (a) providing a microfiber web;
    2. (b) impregnating the microfiber web with an impregnation composition comprising fluoropolymer;
    3. (c) drying the impregnated microfiber web;
    4. (d) applying a coating composition comprising polyurethane on one side only of the dried, impregnated microfiber web; and
    5. (e) thermally treating the coated microfiber web obtained in step (d),
    wherein the coated microfiber web is applied to at least one side of the radiation protection material and wherein the polyurethane-coated side is adjacent to the radiation protection material.

Beschreibung der FigurenDescription of the figures

  • Figur 1 zeigt eine schematische Darstellung eines Querschnitts der beschichteten Mikrofaserbahn. FIG. 1 shows a schematic representation of a cross section of the coated microfiber web.
  • Figur 2 zeigt eine schematische Darstellung eines Querschnitts der erfindungsgemäßen Strahlenschutzvorrichtung. FIG. 2 shows a schematic representation of a cross section of the radiation protection device according to the invention.
Beschichtete MikrofaserbahnCoated microfiber web

Die vorliegende Erfindung betrifft die Verwendung einer beschichteten Mikrofaserbahn, umfassend:

  1. (i) eine Mikrofaserbahn, die mit einem Fluorpolymer imprägniert ist; und
  2. (ii) eine Schicht, die Polyurethan umfasst, welches nur auf einer Seite der Mikrofaserbahn vorhanden ist.
The present invention relates to the use of a coated microfiber web, comprising:
  1. (i) a microfiber web impregnated with a fluoropolymer; and
  2. (ii) a layer comprising polyurethane present on only one side of the microfiber web.

Die Mikrofaserbahn ist nicht besonders beschränkt. Sie kann ein beliebiges flächiges Gebilde, wie Gewebe, Gewirk, Gestrick, Membran oder Vlies, sein, das Mikrofasern enthält. Bevorzugt sind Gewebe.The microfiber web is not particularly limited. It can be any flat structure, such as fabric, knitted fabric, knitted fabric, membrane or fleece containing microfibers. Preference is given to tissue.

Mikrofasern sind Fasern, die bevorzugt eine Faserstärke von 0,5 dtex bis 1,5 dtex, stärker bevorzugt 0,3 dtex bis 1,0 dtex aufweisen. Die Art der Mikrofasern ist vom geplanten Einsatzzweck abhängig. Beispiele für geeignete Mikrofasertypen umfassen Mikrofasern auf der Basis von Polyester, Polyamid, Cellulose (z.B. Acetat oder Viskose) und Polytetrafluorethylen sowie Gemisch davon. Mikrofasern auf der Basis von Polyester und/oder Polyamid besonders geeignet.Microfibers are fibers that preferably have a fiber thickness of 0.5 dtex to 1.5 dtex, more preferably 0.3 dtex to 1.0 dtex. The type of microfibers depends on the intended use. Examples of suitable types of microfibers include microfibers based on polyester, polyamide, cellulose (eg acetate or viscose) and Polytetrafluoroethylene and mixture thereof. Microfibres based on polyester and / or polyamide are particularly suitable.

Die Mikrofaserbahn kann elektrisch leitende Fasern enthalten, um elektrostatische Aufladungen zu vermindern. Die elektrisch leitenden Fasern sind nicht besonders beschränkt. Beispiele hierfür sind Fasern aus Kohlenstoff, Metall oder Fasern auf Polymerbasis, beispielsweise Polymerfasern, die Kohlenstoff- oder Metallteilchen enthalten. In einer bevorzugten Ausführungsform werden Polymerfasern, die Kohlenstoffteilchen enthalten, verwendet. Die elektrisch leitenden Fasern haben beispielsweise eine Faserstärke im Bereich von 1 dtex bis 3 dtex, bevorzugt 1,2 dtex bis 2 dtex. Wenn der Durchmesser der elektrisch leitenden Fasern größer (bevorzugt 1,2- bis 3-fach größer, stärker bevorzugt 1,2- bis 2-fach größer) als der Durchmesser der Mikrofasern ist, ragen die elektrisch leitenden Fasern aus der Gewebeoberfläche hervor. Der Fachmann kann die Menge der elektrisch leitenden Fasern auf Grund seines Fachwissens geeignet wählen. Es werden üblicherweise 0,1 Gew.-% bis 10 Gew.-%, bevorzugt 0,5 Gew.-% bis 3 Gew.-% elektrisch leitende Fasern in der Mikrofaserbahn enthalten sein, wobei sich die Gewichtsprozent auf das Gesamtgewicht der Fasern in der unbeschichteten Mikrofaserbahn beziehen. In einer bevorzugten Ausführungsform soll die fertige Mikrofaserbahn einen elektrostatischen Oberflächenwiderstand von etwa 105 Ohm bis etwa 108 Ohm (gemessen nach DIN 100015-1 bei 25 % rel. Luftfeuchtigkeit und 23 °C) aufweisen.The microfiber web may contain electrically conductive fibers to reduce electrostatic charges. The electrically conductive fibers are not particularly limited. Examples of these are fibers of carbon, metal or polymer-based fibers, for example polymer fibers containing carbon or metal particles. In a preferred embodiment, polymer fibers containing carbon particles are used. The electrically conductive fibers have, for example, a fiber thickness in the range from 1 dtex to 3 dtex, preferably 1.2 dtex to 2 dtex. When the diameter of the electroconductive fibers is larger (preferably 1.2 to 3 times larger, more preferably 1.2 to 2 times larger) than the diameter of the microfibers, the electroconductive fibers protrude from the tissue surface. The person skilled in the art can suitably choose the amount of the electrically conductive fibers on the basis of his knowledge. It will usually contain 0.1 wt .-% to 10 wt .-%, preferably 0.5 wt .-% to 3 wt .-% of electrically conductive fibers in the microfiber web, wherein the weight percent based on the total weight of the fibers in refer to the uncoated microfiber web. In a preferred embodiment, the finished microfiber web should have an electrostatic surface resistance of about 10 5 ohms to about 10 8 ohms (measured according to DIN 100015-1 at 25% relative humidity and 23 ° C).

Mikrofasern und die gegebenenfalls vorhandenen elektrisch leitenden Fasern werden gemäß bekannten Verfahren zu einer Mikrofaserbahn verarbeitet. Die elektrisch leitenden Fasern können statistisch oder in einer regelmäßigen Anordnung in die Mikrofaserbahn eingearbeitet sein. Die Art der Einarbeitung wird von den Anforderungen an die Ableitung von elektrischen Aufladungen sowie von dem Verfahren, mit dem die Mikrofaserbahn hergestellt wird, abhängen. In einer bevorzugten Ausführungsform werden die elektrisch leitenden Fasern in einer regelmäßigen Anordnung eingearbeitet. Sie können beispielsweise in einer gitterförmigen Anordnung eingearbeitet sein, da diese Anordnung mögliche elektrostatische Aufladungen besonders günstig ableitet. Die Abstände zwischen den Gitterlinien liegen bevorzugt im Bereich von 3 mm bis 100 mm, bevorzugt 5 mm bis 75 mm, wobei die Seitenlängen der Gitterrechtecke voneinander verschieden sein können.Microfibers and the optionally present electrically conductive fibers are processed according to known methods to a microfiber web. The electrically conductive fibers may be incorporated randomly or in a regular array in the microfiber web. The type of incorporation will depend on the requirements for dissipation of electrical charges as well as the process by which the microfiber web is made. In a preferred embodiment, the electrically conductive fibers are incorporated in a regular array. They can be incorporated, for example, in a grid-like arrangement, since this arrangement derives possible electrostatic charges particularly favorable. The distances between the grid lines are preferably in the range of 3 mm to 100 mm, preferably 5 mm to 75 mm, wherein the side lengths of the grid rectangles may be different from each other.

Die Luftdurchlässigkeit der Mikrofaserbahn, die als Ausgangsmaterial verwendet wird, wird vom Fachmann je nach Verwendungszweck geeignet gewählt. In einer Ausführungsform beträgt die Luftdurchlässigkeit 0 bis 100 l/min pro dm2, bevorzugt 5 bis 50l/min pro dm2, wobei die Luftdurchlässigkeit nach DIN EN ISO 9237 gemessen wird.The air permeability of the microfiber web used as the starting material is suitably selected by a person skilled in the art according to the purpose of use. In one embodiment, the air permeability is 0 to 100 l / min per dm 2 , preferably 5 to 50 l / min per dm 2 , wherein the air permeability according to DIN EN ISO 9237 is measured.

Das Flächengewicht der Mikrofaserbahn, die als Ausgangsmaterial verwendet wird, wird ebenfalls im Hinblick auf den Verwendungszweck geeignet gewählt. Das Flächengewicht wird üblicherweise im Bereich von 50 g/m2 bis 200 g/m2, bevorzugt 60 g/m2 bis 150 g/m2, liegen.The basis weight of the microfiber web used as a starting material is also suitably selected in view of the purpose of use. The basis weight will usually be in the range from 50 g / m 2 to 200 g / m 2 , preferably 60 g / m 2 to 150 g / m 2 .

Die Dicke der Mikrofaserbahn, die als Ausgangsmaterial verwendet wird, ist nicht besonders beschränkt. Sie wird üblicherweise im Hinblick auf den Verwendungszweck gewählt werden. In einer Ausführungsform wird die Mikrofaserbahn eine Dicke im Bereich von 0,05 mm bis 0,20 mm, bevorzugt 0,10 mm bis 0,15 mm, aufweisen.The thickness of the microfiber web used as a starting material is not particularly limited. It will usually be chosen in view of the intended use. In one embodiment, the microfiber web will have a thickness in the range of 0.05 mm to 0.20 mm, preferably 0.10 mm to 0.15 mm.

Die Mikrofaserbahn ist mit Fluorpolymer imprägniert. Das Fluorpolymer kann ein teil- oder perfluoriertes Polymer sein. Es sind sowohl Homo- als auch Copolymere geeignet. Fluoralkylacrylathomopolymere und Fluoralkylacrylatcopolymere sind besonders geeignet.The microfiber web is impregnated with fluoropolymer. The fluoropolymer may be a partially or perfluorinated polymer. Both homopolymers and copolymers are suitable. Fluoroalkyl acrylate homopolymers and fluoroalkyl acrylate copolymers are particularly suitable.

Bevorzugte Fluorpolymere weisen perfluoralkylhaltige Seitengruppen auf. Diese Seitengruppen können beispielsweise durch Polymerisieren von perfluoralkylhaltigen Monomeren, die den folgenden Aufbau aufweisen, in das Fluorpolymer eingebracht werden:

  • Perfluoralkyleinheit - optionaler Spacer - polymerisierbare Gruppe
Preferred fluoropolymers have perfluoroalkyl-containing side groups. These side groups can be introduced into the fluoropolymer, for example, by polymerizing perfluoroalkyl-containing monomers having the following structure:
  • Perfluoroalkyl moiety - optional spacer - polymerizable group

Die Perfluoralkyleinheit weist bevorzugt 4 bis 12 Kohlenstoffatomen auf. Der optionale Spacer ist nicht besonders beschränkt, mit der Maßgabe, dass er keine Perfluoralkyleinheit ist. Er weist bevorzugt 2 bis 10 Atome, stärker bevorzugt 2 bis 8 Atome, in der Kette auf. In dem Spacer können sowohl Kohlenstoffatome wie auch Heteroatome wie N, O und S vorhanden sein. Die polymerisierbare Gruppe ist nicht besonders beschränkt und kann jede polymerisierbare Gruppe sein, die zur Bildung eines Polymers geeignet ist. Beispiele für polymerisierbare Gruppen umfassen ethylenisch ungesättigte Gruppen.The perfluoroalkyl moiety preferably has 4 to 12 carbon atoms. The optional spacer is not particularly limited, provided that it is not a perfluoroalkyl unit. It preferably has 2 to 10 atoms, more preferably 2 to 8 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer. The polymerizable group is not particularly limited and may be any polymerizable group used to form a Polymers is suitable. Examples of polymerizable groups include ethylenically unsaturated groups.

Beispiele für perfluoralkylhaltige Monomere sind perfluoralkylhaltige Acrylate der Formel

        H2C=CR-C(O)-C)-(CH2)n-CmF2m+1

wobei

  • R H oder CH3 bedeutet;
  • n 0 bis 8, bevorzugt 0 bis 6, beträgt; und
  • m 4 bis 12 beträgt.
Examples of perfluoroalkyl-containing monomers are perfluoroalkyl-containing acrylates of the formula

H 2 C = CR-C (O) -C) - (CH 2 ) n -C m F 2m + 1

in which
  • RH or CH 3 means;
  • n is 0 to 8, preferably 0 to 6; and
  • m is 4 to 12.

Die Fluorpolymere können weitere Seitengruppen aufweisen, wobei insbesondere alkylhaltige Seitengruppen und/oder funktionelle Seitengruppen geeignet sind. In einer Ausführungsform kann das Fluorpolymer alkylhaltige Seitengruppen aufweisen.The fluoropolymers may have further side groups, in particular alkyl-containing side groups and / or functional side groups being suitable. In one embodiment, the fluoropolymer may have alkyl-containing side groups.

Diese Seitengruppen können beispielsweise durch Polymerisieren von alkylhaltigen Monomeren, die den folgenden Aufbau aufweisen, in das Fluorpolymer eingebracht werden:

  • Alkyleinheit - optionaler Spacer - polymeriserbare Gruppe
These side groups can be incorporated into the fluoropolymer, for example, by polymerizing alkyl-containing monomers having the following structure:
  • Alkyl moiety - optional spacer - polymerizable group

Die Alkyleinheit weist bevorzugt 1 bis 12 Kohlenstoffatomen auf. Der optionale Spacer ist nicht besonders beschränkt, mit der Maßgabe, dass er keine Alkyleinheit ist. Er weist bevorzugt 0 bis 20 Atome, stärker bevorzugt 0 bis 10 Atome, in der Kette auf. In dem Spacer können sowohl Kohlenstoffatome wie auch Heteroatome wie N, O und S vorhanden sein. Die polymerisierbare Gruppe ist nicht besonders beschränkt und kann jede polymerisierbare Gruppe sein, die zur Bildung eines Polymers geeignet ist. Beispiele für polymerisierbare Gruppen umfassen ethylenisch ungesättigte Gruppen.The alkyl moiety preferably has 1 to 12 carbon atoms. The optional spacer is not particularly limited, provided that it is not an alkyl moiety. It preferably has 0 to 20 atoms, more preferably 0 to 10 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer. The polymerizable group is not particularly limited and may be any polymerizable group that is suitable for forming a polymer. Examples of polymerizable groups include ethylenically unsaturated groups.

Beispiele für alkylhaltige Monomere sind alkylhaltige Acrylate der Formel

  • H2C=CR-C(O)-O-CpH2p+1
wobei
  • R H oder CH3 bedeutet; und
  • p 1 bis 12 beträgt.
Examples of alkyl-containing monomers are alkyl-containing acrylates of the formula
  • H 2 C = CR-C (O) -OC p H 2p + 1
in which
  • RH or CH 3 means; and
  • p is 1 to 12.

In einer Ausführungsform kann das Fluorpolymer funktionelle Seitengruppen aufweisen.In one embodiment, the fluoropolymer may have pendant functional groups.

Diese Seitengruppen können beispielsweise durch Polymerisieren von funktionellen Monomeren, die den folgenden Aufbau aufweisen, in das Fluorpolymer eingebracht werden:

  • funktionelle Einheit - optionaler Spacer - polymerisierbare Gruppe
These side groups can be incorporated into the fluoropolymer, for example, by polymerizing functional monomers having the following structure:
  • functional unit - optional spacer - polymerizable group

Die funktionelle Einheit ist nicht besonders beschränkt und kann jede funktionelle Gruppe enthalten. Beispiele für funktionelle Gruppen sind OH, SH, NH2, N-Methylolsulfonamide usw. Die funktionelle Einheit weist bevorzugt 0 bis 20 Kohlenstoffatomen, bevorzugt 0 bis 12 Kohlenstoffatomen, auf. Der optionale Spacer ist nicht besonders beschränkt, mit der Maßgabe, dass er keine Alkyleinheit ist. Er weist bevorzugt 0 bis 20 Atome, stärker bevorzugt 0 bis 10 Atome, in der Kette auf. In dem Spacer können sowohl Kohlenstoffatome wie auch Heteroatome wie N, O und S vorhanden sein. Die polymerisierbare Gruppe ist nicht besonders beschränkt und kann jede polymerisierbare Gruppe sein, die zur Bildung eines Polymers geeignet ist. Beispiele für polymerisierbare Gruppen umfassen ethylenisch ungesättigte Gruppen.The functional unit is not particularly limited and may include any functional group. Examples of functional groups are OH, SH, NH 2 , N-methylolsulfonamides, etc. The functional unit preferably has 0 to 20 carbon atoms, preferably 0 to 12 carbon atoms. The optional spacer is not particularly limited, provided that it is not an alkyl moiety. It preferably has 0 to 20 atoms, more preferably 0 to 10 atoms, in the chain. Both carbon atoms and heteroatoms such as N, O and S can be present in the spacer. The polymerizable group is not particularly limited and may be any polymerizable group that is suitable for forming a polymer. Examples of polymerizable groups include ethylenically unsaturated groups.

Beispiele für funktionelle Monomere sind Acrylate der Formel

  • H2C=CR-C(O)-O-CpH2pX
wobei
  • R H oder CH3 bedeutet;
  • p 1 bis 12 beträgt; und
  • X eine funktionelle Gruppe ausgewählt aus OH, SH, NH2, und N-Methylolsulfonamide bedeutet.
Examples of functional monomers are acrylates of the formula
  • H 2 C = CR-C (O) -OC p H 2p X
in which
  • RH or CH 3 means;
  • p is 1 to 12; and
  • X represents a functional group selected from OH, SH, NH 2 , and N-methylolsulfonamides.

Beispiele von kommerziell erhältlichen Fluorpolymeren umfassen Evoral®, Oleophobol, Scotchguard, Tubiguard, Repellan, Ruco-Guard, Unidyne, Quecophob und Nuva, sind aber nicht darauf beschränkt.Examples of commercially available fluoropolymers include Evoral ®, Oleophobol, Scotch Guard, Tubiguard, Repellan, Ruco-Guard, Unidyne, Quecophob and Nuva, but are not limited thereto.

Die imprägnierte Mikrofaserbahn enthält bevorzugt 0,2 g bis 5 g, stärker bevorzugt 0,2 g bis 1,2 g, Fluorpolymer bezogen auf 100 g Mikrofaserbahn, die als Ausgangsmaterial verwendet wird. Wenn eine entsprechende Menge an Fluorpolymer eingesetzt wird, weist die beschichtete Mikrofaserbahn langfristig eine gute Wasser- und Ölabweisung, Haftung zum Substrat und guten Griff auf.The impregnated microfiber web preferably contains from 0.2 g to 5 g, more preferably from 0.2 g to 1.2 g, of fluoropolymer based on 100 g of microfiber web used as the starting material. If an appropriate amount of fluoropolymer is used, the coated microfiber web has long-term good water and oil repellency, adhesion to the substrate and good grip.

Die Imprägnierungszusammensetzung kann des Weiteren, falls erforderlich, Hilfsstoffe, wie Silikone, Wachse und Salze (beispielsweise Zirkoniumsalze), enthalten.The impregnating composition may further contain adjuvants such as silicones, waxes and salts (for example, zirconium salts) if necessary.

Auf einer Seite der Mikrofaserbahn ist eine Schicht, die Polyurethan umfasst, aufgebracht. Durch die Schicht, die Polyurethan umfasst, ist die beschichtete Mikrofaserbahn leicht zu Reinigen. Des Weiteren gewährleistet diese Schicht Dichtheit gegen Wasser und Penetration durch Mikroorganismen, wie Bakterien. Die Schicht, die Polyurethan umfasst, ist bevorzugt in Form einer kontinuierlichen Schicht auf einer Oberfläche der Mikrofaserbahn aufgebracht. Die Schicht sollte eine einheitliche Dicke aufweisen. Die Dicke der Schicht liegt bevorzugt im Bereich von 3 g/m2 bis 50 g/m2, stärker bevorzugt im Bereich von 8 g/m2 bis 20 g/m2.On one side of the microfiber web, a layer comprising polyurethane is applied. Due to the layer, which includes polyurethane, the coated microfiber web is easy to clean. Furthermore, this layer ensures tightness against water and penetration by microorganisms, such as bacteria. The layer comprising polyurethane is preferably applied in the form of a continuous layer on a surface of the microfiber web. The layer should have a uniform thickness. The thickness of the layer is preferably in the range of 3 g / m 2 to 50 g / m 2 , more preferably in the range of 8 g / m 2 to 20 g / m 2 .

Als Polyurethane kommen alle Polyurethanhomo- und -copolymere in Frage. Unter anderem kommen Polyurethanblockcopolymere wie Polyester-Polyurethane und Polyetherpolyol-Polyurethane in Frage. Die Polyester und Poletherpolyole haben üblicherweise ein Molelulargewicht von 4000 bis 6000. Ein Beispiel eines kommerziell erhältlichen Produktes ist Impranil®.Suitable polyurethanes are all polyurethane homopolymers and copolymers. Among others, polyurethane block copolymers such as polyester polyurethanes and polyether polyol polyurethanes come into question. The polyester and polyether polyols typically have a Molelulargewicht from 4000 to 6000. An example of a commercially available product is Impranil ®.

Die Schicht, die Polyurethan umfasst, kann neben Polyurethan auch weitere Bestandteile enthalten. Ein möglicher Bestandteil ist ein Fluorharz. Das Fluorharz kann mit dem Fluorpolymer identisch sein oder von diesem verschieden sein. Das Fluorharz ist bevorzugt mit dem Fluorpolymer identisch, so dass die vorstehenden Ausführungen zum Fluorpolymer gelten.The polyurethane-containing layer may contain other ingredients in addition to polyurethane. One possible ingredient is a fluororesin. The fluororesin may be identical to or different from the fluoropolymer. The fluororesin is preferably identical to the fluoropolymer, so that the above statements apply to the fluoropolymer.

Das Fluorharz ist bevorzugt in einer Menge von 0 bis 10 Gewichtsteilen, stärker bevorzugt 0,5 Gewichtsteilen bis 3 Gewichtsteilen, bezogen auf 100 Gewichtsteile Polyurethan, in der Schicht enthalten.The fluororesin is preferably contained in the layer in an amount of 0 to 10 parts by weight, more preferably 0.5 part by weight to 3 parts by weight, based on 100 parts by weight of polyurethane.

Die Schicht, die Polyurethan umfasst, kann weitere Hilfsstoffe umfassen. Ein optionaler Hilfsstoff ist Siliciumdioxid. Die Sterilisierbarkeit mit Gasen wie Ethylenoxid wird durch den Zusatz von Siliciumdioxid verbessert. Siliciumdioxid wird bevorzugt in Form von Kieselsäure in der Schicht eingesetzt. Die Größe der Siliciumdioxidteilchen liegt üblicherweise im Bereich von 0,2 µm bis 10 µm, bevorzugt 0,2 µm bis 5 µm. Siliciumdioxid ist bevorzugt in einer Menge von 0 bis 10 Gewichtsteilen, stärker bevorzugt von 1 Gewichtsteil bis 5 Gewichtsteilen, bezogen auf 100 Gewichtsteile Polyurethan, in der Schicht enthalten.The layer comprising polyurethane may comprise further adjuvants. An optional adjuvant is silica. The sterilizability with gases such as ethylene oxide is improved by the addition of silicon dioxide. Silica is preferably used in the form of silica in the layer. The size of the silica particles is usually in the range of 0.2 μm to 10 μm, preferably 0.2 μm to 5 μm. Silica is preferably contained in the layer in an amount of 0 to 10 parts by weight, more preferably 1 part to 5 parts by weight, based on 100 parts by weight of polyurethane.

Die Schicht, die Polyurethan umfasst, kann außerdem Titandioxid umfassen. Titandioxid dient als Mattierungsmittel. Die Größe der Titandioxidteilchen liegt üblicherweise im Bereich von 0,2 µm bis 10 µm, bevorzugt von 0,2 µm bis 5 µm. Titandioxid ist bevorzugt in einer Menge von 0 bis 5 Gewichtsteilen, stärker bevorzugt 0,2 Gewichtsteilen bis 2 Gewichtsteilen, bezogen auf 100 Gewichtsteile Polyurethan, in der Schicht enthalten.The layer comprising polyurethane may further comprise titanium dioxide. Titanium dioxide serves as a matting agent. The size of the titanium dioxide particles is usually in the range of 0.2 μm to 10 μm, preferably 0.2 μm to 5 μm. Titanium dioxide is preferably contained in the layer in an amount of 0 to 5 parts by weight, more preferably 0.2 part by weight to 2 parts by weight, based on 100 parts by weight of polyurethane.

Des Weiteren kann die Schicht, die Polyurethan umfasst, weitere Additive wie Entlüfter, Fungizide, Additive zur Erhöhung der Kratzfestigkeit, Hydrophobierungsmittel, Verdicker, Rheologiehilfsmittel, Verlaufshilfsmittel, usw. enthalten. Diese Additive sind entweder Additive für die Herstellung der Schicht oder verbessern die Eigenschaften der fertigen Schicht. Der Fachmann kann sie auf Grund seines Fachwissens geeignet wählen. Die Additive sind bevorzugt in einer Menge von 0 bis 20 Gewichtsteile, stärker bevorzugt 0,5 Gewichtsteile bis 10 Gewichtsteile, bezogen auf 100 Gewichtsteile Polyurethan, in der Schicht enthalten.Furthermore, the layer comprising polyurethane may contain further additives such as deaerators, fungicides, additives for increasing the scratch resistance, water repellents, thickeners, rheology aids, leveling agents, etc. These additives are either additives for the production of the layer or improve the properties of the finished layer. The person skilled in the art can choose it on the basis of his specialist knowledge. The additives are preferably contained in the layer in an amount of 0 to 20 parts by weight, more preferably 0.5 part by weight to 10 parts by weight, based on 100 parts by weight of polyurethane.

Verfahren zur Herstellung der beschichteten MikrofaserbahnProcess for producing the coated microfiber web

Die beschichtete Mikrofaserbahn kann nach verschiedenen Verfahren hergestellt werden. Ein bevorzugtes Verfahren wird im Folgenden beschrieben.The coated microfiber web can be produced by various methods. A preferred method will be described below.

(a) Bereitstellen einer Mikrofaserbahn(a) providing a microfiber web

Zunächst wird eine Mikrofaserbahn bereitgestellt. Die Mikrofaserbahn, die als Ausgangsmaterial verwendet wird, ist vorstehend eingehend beschrieben worden.First, a microfiber web is provided. The microfiber web used as the starting material has been described in detail above.

Die Mikrofaserbahn kann als solches in dem Verfahren eingesetzt werden. Sie kann jedoch, falls gewünscht, einer Vorbehandlung beispielsweise zur Erhöhung der Hydrophilie unterzogen werden. Die Vorbehandlung beispielsweise zur Erhöhung der Hydrophilie kann nach auf dem Fachgebiet bekannten Verfahren durchgeführt werden. Als Mittel zur Erhöhung der Hydrophilie können nichtionische Tenside, Fettsäurekondensate, Silicone und Gemische davon verwendet werden.The microfiber web can be used as such in the process. However, if desired, it may be subjected to a pretreatment, for example to increase the hydrophilicity. The pretreatment, for example to increase the hydrophilicity, can be carried out by methods known in the art. As the hydrophilicity-enhancing agent, there may be used nonionic surfactants, fatty acid condensates, silicones and mixtures thereof.

Die Mittel zur Erhöhung der Hydrophilie werden auf die Mikrofaserbahn aufgebracht. Das Aufbringungsverfahren ist nicht besonders beschränkt. In einer Ausführungsform wird die Mikrofaserbahn (beispielsweise durch Sprühen, Eintauchen, usw.) mit einer Lösung oder Dispersion der Mittel zur Erhöhung der Hydrophilie in Kontakt gebracht.The hydrophilicity enhancers are applied to the microfiber web. The application method is not particularly limited. In one embodiment, the microfiber web is contacted (for example, by spraying, dipping, etc.) with a solution or dispersion of the hydrophilicity enhancer.

Nach dem Aufbringen der Mittel zur Erhöhung der Hydrophilie wird die erhaltene Mikrofaserbahn bevorzugt getrocknet. Die genauen Trocknungsbedingungen hängen von dem verwendeten Mittel zur Erhöhung der Hydrophilie ab. Üblicherweise wird eine Trocknungstemperatur von 40 °C bis 80 °C, bevorzugt von 50 °C bis 60 °C, gewählt werden. Die Trocknungsdauer liegt üblicherweise bei 30 s bis 240 s, bevorzugt bei 60 s bis 120 s.After application of the hydrophilicity enhancing agent, the resulting microfiber web is preferably dried. The exact drying conditions will depend on the hydrophilicizing agent used. Usually, a drying temperature of 40 ° C to 80 ° C, preferably from 50 ° C to 60 ° C, can be selected. The drying time is usually from 30 seconds to 240 seconds, preferably from 60 seconds to 120 seconds.

Es ist wünschenswert, wenn die Mikrofaserbahn vor dem Imprägnierschritt eine Flottenaufnahme für das Fluorpolymer von 65 Gew.-% bis 85 Gew.-%, stärker bevorzugt von 65 Gew.-% bis 70 Gew.-%, bezogen auf das Trockengewicht der ggf. vorbehandelten Mikrofaserbahn aufweist.It is desirable if the microfiber web before the impregnation step has a liquor pickup for the fluoropolymer of from 65 wt% to 85 wt%, stronger preferably from 65 wt .-% to 70 wt .-%, based on the dry weight of the optionally pretreated microfiber web.

(b) Imprägnieren der Mikrofaserbahn mit einer Imprägnierungszusammensetzung, die Fluorpolymer umfasst(b) impregnating the microfiber web with an impregnating composition comprising fluoropolymer

Die Mikrofaserbahn wird mit einer Imprägnierungszusammensetzung, die Fluorpolymer umfasst, imprägniert. Geeignete Fluorpolymere sind vorstehend beschrieben.The microfiber web is impregnated with an impregnation composition comprising fluoropolymer. Suitable fluoropolymers are described above.

Die Mikrofaserbahn wird nach bekannten Verfahren imprägniert. Diese Verfahren umfassen Sprühen, Eintauchen, Ausziehverfahren, Pflatschen, und Schaumimprägnierung. Eine Tauchimprägnierung ist bevorzugt, da dies eine vollständige Imprägnierung der Mikrofaserbahn ermöglicht.The microfiber web is impregnated by known methods. These methods include spraying, dipping, exhaustion, paddling, and foam impregnation. Dipping impregnation is preferred because it allows complete impregnation of the microfiber web.

Bei der Imprägnierung der Mikrofaserbahn wird das Fluorpolymer üblicherweise in Form einer Lösung oder Dispersion eingesetzt. Die Konzentration der Lösung oder Dispersion ist nicht besonders beschränkt und liegt bevorzugt im Bereich von 5 g/l bis 70 g/l, stärker bevorzugt im Bereich von 5 g/l bis 50 g/l.In the impregnation of the microfiber web, the fluoropolymer is usually used in the form of a solution or dispersion. The concentration of the solution or dispersion is not particularly limited, and is preferably in the range of 5 g / L to 70 g / L, more preferably in the range of 5 g / L to 50 g / L.

(c) Trocknen der imprägnierten Mikrofaserbahn (c) drying the impregnated microfiber web

Nach der Imprägnierung wird die imprägnierte Mikrofaserbahn getrocknet.After impregnation, the impregnated microfiber web is dried.

Die vorliegenden Erfinder haben gefunden, dass die Eigenschaften von Imprägnierungen mit Fluorpolymeren durch eine geeignete Abfolge von Trocknung und thermischer Behandlung beeinflusst werden können. Ohne an eine bestimmte Theorie gebunden sein zu wollen, glauben sie, dass die Moleküle des Fluorpolymers sich zunächst statistisch auf einem Substrat (wie die vorliegende Mikrofaserbahn) ablagern, wenn das Lösungsmittel entfernt wird. Durch die statistische (d.h. ungeordnete) Anordnung sind die hydrophoben Fluoratome zunächst ebenfalls statistisch verteilt. Wenn das Fluorpolymer einer höheren Temperatur ausgesetzt wird, kommt es zu einer Umorientierung der Moleküle des Fluorpolymers, wobei die hydrophoben Fluoratome sich bevorzugt auf der Oberfläche der Schicht anordnen.The present inventors have found that the properties of fluoropolymer impregnations can be influenced by a suitable sequence of drying and thermal treatment. Without wishing to be bound by any particular theory, they believe that the molecules of the fluoropolymer initially settle randomly on a substrate (such as the present microfiber web) when the solvent is removed. Due to the statistical (ie disordered) arrangement, the hydrophobic fluorine atoms are initially also statistically distributed. When the fluoropolymer is exposed to a higher temperature, comes it leads to a reorientation of the molecules of the fluoropolymer, wherein the hydrophobic fluorine atoms are preferably arranged on the surface of the layer.

Man kann mit Hilfe der Saugfähigkeit bestimmen, ob eine bestimmte Temperatur für ein bestimmtes Fluorpolymer als Trocknungstemperatur (Schritt (c)) oder als Temperatur für die thermische Behandlung (Schritt (e)) anzusehen ist.With the aid of the absorbency, it is possible to determine whether a specific temperature for a particular fluoropolymer is to be regarded as the drying temperature (step (c)) or as the temperature for the thermal treatment (step (e)).

Ein Testgewebe aus Baumwolle EMPA 210, Leinwandbindung, gebleicht, ohne optische Aufheller (Bezugsquelle EMPA Testmaterialien AG, St. Gallen, Schweiz) wird mittels Foulardierung mit 0,5 g Fluorpolymer pro 100 g Baumwollgewebe imprägniert und bei Raumtemperatur getrocknet. Das Gewebe wird anschließend in gleichgroße Stücke geschnitten. Die Stücke werden anschließend bei unterschiedlichen Temperaturen 120 s erwärmt (bspw. 40 °C, 50 °C, ....., 140 °C, 150 °C), wobei die Temperaturdifferenz zwischen den einzelnen Schritten 10 °C beträgt. Die genaue Minimal- und Maximaltemperatur hängt vom Fluorpolymer ab und kann anhand des gemessenen Kurvenverlaufs betimmt werden. Es wird das Gewicht des jeweiligen Gewebestücks, das bei der Temperatur Ti erwärmt wurde mtrocken(Ti), gemessen.A test fabric of cotton EMPA 210, plain weave, bleached, without optical brightener (source EMPA Test Materials AG, St. Gallen, Switzerland) is impregnated by padding with 0.5 g of fluoropolymer per 100 g of cotton fabric and dried at room temperature. The fabric is then cut into pieces of equal size. The pieces are then heated at different temperatures for 120 s (eg 40 ° C, 50 ° C, ....., 140 ° C, 150 ° C), the temperature difference between the individual steps being 10 ° C. The exact minimum and maximum temperature depends on the fluoropolymer and can be determined from the measured waveform. The weight of the respective piece of fabric which has been heated at the temperature T i is measured (T i ).

Nach dem Abkühlen werden die Gewebestücke mit einer wässrigen Flotte bei 2 bar Druck und 1,5 m/min Walzengeschwindigkeit foulardiert. Es wird das Gewicht des jeweiligen Gewebestücks, das bei der Temperatur Ti erwärmt wurde mnass(Ti), gemessen.After cooling, the fabric pieces are padded with an aqueous liquor at 2 bar pressure and 1.5 m / min roller speed. The weight of the respective piece of fabric which has been heated at the temperature T i wet (T i ) is measured.

Die Flottenaufnahme für das Gewebestück, das bei der Temperatur Ti erwärmt wurde, wird anhand der folgenden Formel berechnet: Flottenaufnahme T i % = m nass T i - m trocken T i m trocken T i × 100

Figure imgb0001
The liquor pickup for the piece of tissue heated at the temperature T i is calculated using the following formula: liquor pickup T i % = m wet T i - m dry T i m dry T i × 100
Figure imgb0001

Bei niedrigen Temperaturen Ti ist die Flottenaufnahme relativ konstant. Sie sinkt bei einer bestimmten Temperatur Ti jedoch plötzlich auf deutlich niedrigere Werte ab. Nach dem Anstieg werden dann trotz steigender Temperatur Ti wieder relativ konstante Werte für die Flottenaufnahme ermittelt. Beim Schritt (c) sollte die Trocknungstemperatur so gewählt werden, dass man im Bereich liegt, bei dem die relativ konstante hohe Flottenaufnahme erhalten wird. Beim Schritt (e) sollte die Temperatur der thermischen Behandlung so gewählt werden, dass man im Bereich liegt, bei dem die relativ konstante niedrige Flottenaufnahme erhalten wird. Der Übergangsbereich zwischen beiden Zonen ist weniger geeignet. In der Regel wird die Flottenaufnahme, wenn man sich im Bereich der Trocknung befindet, mindestens 20 % betragen. In der Regel wird die Flottenaufnahme, wenn man sich im Bereich der thermischen Behanldung befindet, höchstens 10 % betragen. Diese Zahlen sind jedoch nur Anhaltspunkte und können je nach Fluorpolymer variieren.At low temperatures T i , the liquor pickup is relatively constant. However, at a certain temperature T i, it suddenly drops to significantly lower values. After the increase, relatively constant values for the liquor pick-up are then determined despite the increasing temperature T i . In step (c), the drying temperature should be selected to be in the range where the relatively constant high liquor pickup is is obtained. In step (e), the temperature of the thermal treatment should be selected to be within the range for which the relatively constant low liquor pickup is obtained. The transition area between the two zones is less suitable. As a rule, the liquor pick-up when drying is at least 20%. In general, the liquor pick-up, when in thermal treatment, will be at most 10%. However, these figures are only guidelines and may vary depending on the fluoropolymer.

Die vorliegende Erfindung macht von dieser Erkenntnis Gebrauch. In Schritt (c) wird die imprägnierte Mikrofaserbahn getrocknet. Dabei lagern sich die Moleküle des Fluorpolymers statistisch auf der Mikrofaserbahn ab. Die Trocknungsbedingungen werden dabei so gewählt, dass es nicht zu einer Umorientierung der Moleküle des Fluorpolymers kommt.The present invention makes use of this knowledge. In step (c), the impregnated microfiber web is dried. The molecules of the fluoropolymer deposit statistically on the microfiber web. The drying conditions are chosen so that there is no reorientation of the molecules of the fluoropolymer.

Die genauen Trocknungsbedingungen hängen von dem verwendeten Fluorpolymer ab. Üblicherweise wird eine Trocknungstemperatur von 40 °C bis 110 °C, bevorzugt von 50 °C bis 80 °C, gewählt. Die Trocknungsdauer liegt üblicherweise bei 10 s bis 240 s, bevorzugt bei 30 s bis 120 s.The exact drying conditions depend on the fluoropolymer used. Usually, a drying temperature of 40 ° C to 110 ° C, preferably from 50 ° C to 80 ° C, is selected. The drying time is usually from 10 s to 240 s, preferably from 30 s to 120 s.

Durch die Imprägnierung mit dem Fluorpolymer wird die Saugfähigkeit der Mikrofaserbahn eingestellt. Dadurch dass das Fluorpolymer lediglich getrocknet wird, ist es einfacher zu gewährleisten, dass die Polyurethanbeschichtungszusammensetzung nicht die gesamte Mikrofaserbahn durchdringt. Wenn das Fluorpolymer bereits vor dem Aufbringen der Polyurethanbeschichtungszusammensetzung thermisch behandelt werden würde, so dass die Moleküle des Fluorpolymers sich orientieren würden, würde die abweisende Oberfläche eine nachträgliche Beschichtung mit der Beschichtungszusammensetzung erschweren.Impregnation with the fluoropolymer sets the absorbency of the microfiber web. By merely drying the fluoropolymer, it is easier to ensure that the polyurethane coating composition does not penetrate the entire microfiber web. If the fluoropolymer were to be thermally treated prior to the application of the polyurethane coating composition so that the molecules of the fluoropolymer would orient themselves, the repellent surface would make subsequent coating with the coating composition more difficult.

Es ist wünschenswert, wenn die Mikrofaserbahn nach dem Trocknungsschritt eine Flottenaufnahme für die Beschichtungszusammensetzung von 30 Gew.-% bis 60 Gew.-%, stärker bevorzugt von 30 Gew.-% bis 50 Gew.-%, bezogen auf Trockengewicht der imprägnierten Mikrofaserbahn aufweist.It is desirable that after the drying step, the microfiber web has a liquor pickup for the coating composition of from 30% to 60%, more preferably from 30% to 50% by weight, based on dry weight of the impregnated microfiber web ,

(d) Aufbringen einer Beschichtungszusammensetzung, die Polyurethan umfasst, auf nur einer Seite der getrockneten, imprägnierten Mikrofaserbahn (d) applying a coating composition comprising polyurethane on only one side of the dried, impregnated microfiber web

Nach dem Trocknungsschritt wird die Beschichtungszusammensetzung, die Polyurethan umfasst, auf nur einer Seite der getrockneten, imprägnierten Mikrofaserbahn aufgebracht. Die Bestandteile der Schicht, die Polyurethan umfasst, sind vorstehend ausführlich beschrieben worden.After the drying step, the coating composition comprising polyurethane is applied to only one side of the dried, impregnated microfiber web. The constituents of the layer comprising polyurethane have been described in detail above.

Die Beschichtungszusammensetzung wird bevorzugt in Form einer Lösung oder Dispersion der gewünschten Bestandteile eingesetzt. Die Konzentration des Polyurethans in der Lösung oder Dispersion ist bevorzugt im Bereich von 50 Gew.-% bis 80 Gew.-%, stärker bevorzugt von 60 Gew.-% bis 80 Gew.-%. Durch die Wahl einer viskosen Beschichtungszusammensetzung ist es einfacher sicherzustellen, dass die Schicht, die Polyurethan umfasst, nur auf einer Seite der fertigen Mikrofaserbahn vorhanden ist.The coating composition is preferably used in the form of a solution or dispersion of the desired ingredients. The concentration of the polyurethane in the solution or dispersion is preferably in the range of 50 wt% to 80 wt%, more preferably 60 wt% to 80 wt%. By choosing a viscous coating composition, it is easier to ensure that the layer comprising polyurethane is present on only one side of the finished microfiber web.

Die Beschichtungszusammensetzung wird nach bekannten Verfahren auf die getrocknete, imprägnierte Mikrofaserbahn aufgebracht. Zu diesen Verfahren gehören Walzenbeschichten, Rakeln, Streichbeschichten, Schaumbeschichten, Transferbeschichten, und Filmziehen, bevorzugt wird Rakeln verwendet.The coating composition is applied to the dried, impregnated microfiber web by known methods. These methods include roll coating, knife coating, knife coating, foam coating, transfer coating, and film drawing, preferably doctoring is used.

Die Beschichtungszusammensetzung wird so aufgebracht, dass die Schicht, die Polyurethan umfasst, nur auf einer Seite der fertigen Mikrofaserbahn vorhanden ist. Figur 1 zeigt eine schematische Darstellung des Querschnitts einer fertigen beschichteten Mikrofaserbahn, wobei die Mikrofaserschicht der Einfachheit halber als Monoschicht dargestellt ist.The coating composition is applied so that the layer comprising polyurethane is present on only one side of the finished microfiber web. FIG. 1 shows a schematic representation of the cross section of a finished coated microfiber web, the microfiber layer is shown for simplicity as a monolayer.

In der gezeigten Ausführungsform umfasst die Mikrofaserbahn (1) Mikrofasern (2) und elektrisch leitende Fasern (3), wobei in dieser Ausführungsform der Durchmesser der elektrisch leitenden Fasern (3) größer als der Durchmesser der Mikrofasern (2) ist. Die Fluorpolymerimprägnierung ist in dieser Abbildung nicht gezeigt. Die Schicht (4), die Polyurethan umfasst, ist nur auf einer Seite der fertigen Mikrofaserbahn vorhanden.In the embodiment shown, the microfiber web (1) comprises microfibers (2) and electrically conductive fibers (3), in which embodiment the diameter of the electrically conductive fibers (3) is greater than the diameter of the microfibers (2). The fluoropolymer impregnation is not shown in this figure. The layer (4) comprising polyurethane is only present on one side of the finished microfiber web.

Es ist selbstverständlich, dass die Beschichtungszusammensetzung beim Aufbringen auf die getrocknete, imprägnierte Mikrofaserbahn zu einem gewissen Grad in die Mikrofaserbahn eindringt. Im Rahmen der Erfindung darf die Schicht, die Polyurethan umfasst, jedoch nicht die Mikrofasern auf der Seite der Mikrofaserbahn, die der Seite, von der sie aufgebracht wurde, gegenüberliegt, abdecken. Der Durchdringungsgrad beträgt bevorzugt höchstens 60 %, stärker bevorzugt höchstens 40 %. Der Durchdringungsgrad beträgt bevorzugt mindestens 20 %, stärker bevorzugt mindestens 30 %. Im Rahmen der Erfindung wird der Durchdringungsgrad wie folgt definiert: Durchdringungsgrad = d 1 d 2 × 100

Figure imgb0002

d1
Dicke des Teils der Mikrofaserschicht, der mit der Schicht, die Polyurethan umfasst, in Kontakt ist
d2
Dicke der gesamten Mikrofaserschicht
It will be understood that the coating composition, when applied to the dried, impregnated microfiber web, penetrates to some degree into the microfiber web. In the context of the invention, however, the layer comprising polyurethane, but not the microfibers on the side of the microfiber web facing the side from which it has been applied must cover. The degree of penetration is preferably at most 60%, more preferably at most 40%. The degree of penetration is preferably at least 20%, more preferably at least 30%. Within the scope of the invention, the degree of penetration is defined as follows: penetration = d 1 d 2 × 100
Figure imgb0002
d 1
Thickness of the part of the microfiber layer in contact with the layer comprising polyurethane
d 2
Thickness of the entire microfiber layer

Die Dicken kann man durch optische Verfahren wie beispielsweise Mikroskopie messen. Ein Beispiel für ein mögliches Meßverfahren ist die Untersuchung eines Querschnitts mittels Rasterelektronenmikroskopie.The thicknesses can be measured by optical methods such as microscopy. An example of a possible measuring method is the investigation of a cross section by means of scanning electron microscopy.

Der Durchdringungsgrad ist in Figur 1 bildlich durch die rechte geschweifte Klammer und die Angabe "x %" angedeutet. In Figur 1 beträgt sie ca. 50 %, da die Mikrofasern (weiße Kugeln) zu ca. 50 % in die Schicht, die Polyurethan umfasst, eingebettet sind.The degree of penetration is in FIG. 1 pictorially indicated by the right curly bracket and the indication "x%". In FIG. 1 it is about 50%, because the microfibers (white balls) are about 50% embedded in the layer that includes polyurethane.

Die Beschichtungszusammensetzung kann nach dem Aufbringen in Schritt (d) getrocknet werden. Alternativ kann auf die Trocknung verzichtet werden und die Beschichtungszusammensetzung im Rahmen der thermischen Behandlung in Schritt (e) getrocknet werden.The coating composition may be dried after application in step (d). Alternatively, the drying may be dispensed with and the coating composition dried in the course of the thermal treatment in step (e).

Falls ein getrennter Trocknungsschritt durchgeführt wird, werden die Bedingungen in Abhängigkeit von der gewählten Beschichtungszusammensetzung gewählt. Sie sollten jedoch so gewählt werden, dass es nicht zu einer Umorientierung der Moleküle des Fluorpolymers kommt.If a separate drying step is performed, the conditions are chosen depending on the chosen coating composition. However, they should be chosen so that there is no reorientation of the molecules of the fluoropolymer.

Üblicherweise wird eine Trocknungstemperatur von 40 °C bis 110 °C, bevorzugt von 80 °C bis 100 °C, gewählt werden. Die Trocknungsdauer liegt üblicherweise bei 10 s bis 240 s, bevorzugt bei 10 s bis 120 s.Usually, a drying temperature of 40 ° C to 110 ° C, preferably from 80 ° C to 100 ° C, can be selected. The drying time is usually from 10 s to 240 s, preferably from 10 s to 120 s.

(e) Thermisches Behandeln der in Schritt (d) erhaltenen beschichteten Mikrofaserbahn (e) thermally treating the coated microfiber web obtained in step (d)

In Schritt (e) wird die (gegebenenfalls getrocknete) beschichtete Mikrofaserbahn, die in Schritt (d) erhalten wird, thermisch behandelt. Bei diesem Schritt werden die Bedingungen so gewählt, dass es zu einer Umorientierung der Moleküle des Fluorpolymers kommt.In step (e), the (optionally dried) coated microfiber web obtained in step (d) is thermally treated. In this step, the conditions are chosen so that there is a reorientation of the molecules of the fluoropolymer.

Bei der thermischen Behandlung wird üblicherweise eine Temperatur von 120 °C bis 190 °C, bevorzugt von 140 °C bis 180 °C, gewählt. Es ist selbstverständlich möglich die thermische Behandlung in mehreren Stufen mit unterschiedlicher Temperatur durchzuführen. Die Dauer der thermischen Behandlung liegt üblicherweise bei 10 s bis 240 s, bevorzugt bei 30 s bis 120 s.In the thermal treatment, a temperature of 120 ° C to 190 ° C, preferably from 140 ° C to 180 ° C is usually selected. It is of course possible to carry out the thermal treatment in several stages with different temperatures. The duration of the thermal treatment is usually from 10 s to 240 s, preferably from 30 s to 120 s.

StrahlenschutzvorrichtungRadiation protection device

Die beschichtete Mikrofaserbahn kann als Abdeckung eines Strahlenschutzmaterials in einer Strahlenschutzvorrichtung verwendet werden, wobei die beschichtete Mikrofaserbahn auf mindestens einer Seite des Strahlenschutzmaterials aufgebracht ist und wobei die mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial benachbart ist.The coated microfiber web may be used as a cover of a radiation protection material in a radiation protection device, wherein the coated microfiber web is applied to at least one side of the radiation protection material and wherein the polyurethane coated side is adjacent to the radiation protection material.

Figur 2 zeigt eine schematische Darstellung eines Querschnitts der erfindungsgemäßen Strahlenschutzvorrichtung (6). In der gezeigten Ausführungsform umfasst die Mikrofaserbahn (1) Mikrofasern (2) und elektrisch leitende Fasern (3), wobei in dieser Ausführungsform der Durchmesser der elektrisch leitenden Fasern (3) größer als der Durchmesser der Mikrofasern (2) ist. Die Fluorpolymerimprägnierung ist in dieser Abbildung nicht gezeigt. Die Schicht (4), die Polyurethan umfasst, ist nur auf einer Seite der fertigen Mikrofaserbahn (1) vorhanden. FIG. 2 shows a schematic representation of a cross section of the radiation protection device (6) according to the invention. In the embodiment shown, the microfiber web (1) comprises microfibers (2) and electrically conductive fibers (3), in which embodiment the diameter of the electrically conductive fibers (3) is greater than the diameter of the microfibers (2). The fluoropolymer impregnation is not shown in this figure. The layer (4) comprising polyurethane is present only on one side of the finished microfiber web (1).

Die Mikrofaserbahn (1) ist in der gezeigten Ausführungsform auf beide Seiten des Strahlenschutzmaterials (5) aufgebracht, wobei die Schicht (4), die Polyurethan umfasst, jeweils dem Strahlenschutzmaterial (5) benachbart ist.In the embodiment shown, the microfiber web (1) is applied to both sides of the radiation protection material (5), wherein the layer (4) comprising polyurethane is in each case adjacent to the radiation protection material (5).

Als Strahlenschutzvorrichtungen können alle Vorrichtungen genannt werden, die Personen oder Gegenstände vor schädlicher Strahlung, insbesondere Röntgenstrahlung, UV-Strahlung, Infrarot-Strahlung, und radioaktiver Strahlung, besonders bevorzugt Röntgenstrahlung, schützen. Beispiele umfassen Schürzen, Handschuhe, Schirme, Vorhänge, Mäntel, Abdecktücher, Abdeckmaterialien, Augenschutzprodukte und Überzieher, sind aber nicht darauf beschränkt. Durch ihre Flexibilität und ihren angenehmen haptischen Eigenschaften eignet sich die beschichtete Mikrofaserbahn besonders für flexible Strahlenschutzvorrichtungen und/oder Strahlenschutzvorrichtungen, die von Personen getragen werden.As radiation protection devices, all devices may be mentioned which protect persons or objects from harmful radiation, in particular X-radiation, UV radiation, infrared radiation, and radioactive radiation, particularly preferably X-radiation. Examples include, but are not limited to, aprons, gloves, umbrellas, curtains, coats, drapes, draping materials, eye protection products and overcoats. Due to its flexibility and its pleasant haptic properties, the coated microfiber web is particularly suitable for flexible radiation protection devices and / or radiation protection devices that are worn by people.

Im Rahmen der Erfindung können alle Arten von Strahlenschutzmaterial verwendet werden. Die Art des Strahlenschutzmaterials wird von der abzuschirmenden Strahlung abhängen und ist nicht besonders beschränkt. Beispielhaft kann Strahlenschutzmaterial auf der Basis von Blei oder Bleioxid erwähnt werden. Bleifreies Strahlenschutzmaterial kann ebenfalls verwendet werden. Bleifreies Strahlenschutzmaterial ist beispielsweise in DE 10 2004 001 328 A , WO 2005/024846 A , WO 2005/023116 A , DE 10 2006 028 958 A , WO 2004/017332 A und DE 10 2005 034 384 offenbart. Kombinationen von Strahlenschutzmaterial sind auch möglich. Das Strahlenschutzmaterial kann eine oder mehrere Lagen umfassen.Within the scope of the invention, all types of radiation protection material can be used. The type of the radiation protection material will depend on the radiation to be shielded and is not particularly limited. By way of example, radiation protection material based on lead or lead oxide can be mentioned. Lead-free radiation protection material can also be used. Lead-free radiation protection material is, for example, in DE 10 2004 001 328 A . WO 2005/024846 A . WO 2005/023116 A . DE 10 2006 028 958 A . WO 2004/017332 A and DE 10 2005 034 384 disclosed. Combinations of radiation protection material are also possible. The radiation protection material may comprise one or more layers.

Bei der Herstellung einer Strahlenschutzvorrichtung wird die beschichtete Mikrofaserbahn auf mindestens einer Seite des Strahlenschutzmaterials aufgebracht. Üblicherweise wird das Strahlenschutzmaterial von der beschichteten Mikrofaserbahn umhüllt. Die Mikrofaserbahn und das Strahlenschutzmaterial können auf bekannte Weise, beispielsweise durch Nähen, Kleben, Tapen, Kaschieren oder Laminieren, miteinander verbunden werden. Wenn die Mikrofaserbahn und das Strahlenschutzmaterial, beispielsweise durch Kaschieren oder Laminieren, zu einem Verbundmaterial verarbeitet werden, können sie auch anschließend durch konfektionstechnische Verfahren, wie Schneiden, Stanzen, Wasserstrahlschneiden, Formen oder Laserstrahlschneiden zu den Endprodukten verarbeitet werden.In the manufacture of a radiation protection device, the coated microfiber web is applied to at least one side of the radiation protection material. Usually, the radiation protection material is enveloped by the coated microfiber web. The microfiber web and the radiation protection material can be joined together in a known manner, for example by sewing, gluing, taping, laminating or laminating. When the microfiber web and the radiation protection material are processed into a composite material, for example by lamination or lamination, they can subsequently also be processed by means of confectioning processes, such as cutting, Punching, water jet cutting, molding or laser beam cutting are processed to the final products.

Die Mikrofaserbahn schützt das Strahlenschutzmaterial. Insbesondere wird das Strahlenschutzmaterial geschützt vor:

  • mechanischer Einwirkung;
  • Penetration durch Keimer (wie Bakterien-, Viren- und Pilzen);
  • chemischer Einwirkung beispielsweise durch Reinigungs- und Desinfektionsmittel;
  • Lichteinwirkung; und/oder
  • Eindringen von Körperflüssigkeiten, wie Blut, Urin oder Schweiß.
The microfiber web protects the radiation protection material. In particular, the radiation protection material is protected against:
  • mechanical action;
  • Penetration by bacteria (such as bacteria, viruses and fungi);
  • chemical action, for example by detergents and disinfectants;
  • Exposure to light; and or
  • Ingress of bodily fluids, such as blood, urine or sweat.

Die beschichtete Mikrofaserbahn verleiht durch ihren textilen Charakter zudem den Strahlenschutzvorrichtungen ein angenehmes Oberflächengefühl, was vor allem Kleidungsstücken ein angenehmes Tragegefühl verleiht.Due to its textile character, the coated microfiber web also gives the radiation protection devices a pleasant surface feel, which, in particular, gives garments a pleasant wearing comfort.

Im Gegensatz zu konventionellen Strahlenschutzvorrichtungen, bei denen eine mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial abgewandt ist, wird die beschichtete Mikrofaserbahn so angeordnet, dass die mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial benachbart ist. Bei der konventionellen Anordnung ist die mit Polyurethan beschichtete Seite folglich nach außen gewandt und somit starken physischen Belastungen ausgesetzt. Dadurch kommt es zu verstärktem Verschließ und Abrieb. Durch die erfindungsgemäße Anordnung, bei der die mit Polyurethan beschichtete Seite nach innen gewandt ist, ist die physische Belastung deutlich geringer. Überraschenderweise weist die beschichtete Mikrofaserbahn bei der erfindungsgemäßen Anordnung eine hohe Schnitt- und Reißfestigkeit auf, so dass ihre Gebrauchseigenschaften denen von konventionellen Materialien deutlich überlegen sind.In contrast to conventional radiation protection devices, in which a polyurethane-coated side faces away from the radiation protection material, the coated microfiber web is arranged so that the polyurethane-coated side is adjacent to the radiation protection material. In the conventional arrangement, the polyurethane-coated side is thus turned outwards and thus exposed to strong physical loads. This leads to increased closure and abrasion. The inventive arrangement, in which the polyurethane coated side faces inwards, the physical load is much lower. Surprisingly, in the arrangement according to the invention, the coated microfiber web has a high cutting and tear resistance, so that its service properties are clearly superior to those of conventional materials.

Die Erfindung wird anhand des folgenden Beispiels erläutert. Die Erfindung ist jedoch nicht auf diese Ausführungsform beschränkt.The invention will be explained with reference to the following example. However, the invention is not limited to this embodiment.

BEISPIELEXAMPLE

Die Mikrofaserbahn wurde aus Polyester-Mikrofasern mit einer Faserstärke von 1 dtex und kohlenstoffhaltigen Fasern (Belltron B31, erhältlich von Kanebo Gohsen Ltd., Japan) hergestellt. Die Fasern wurden zu einer Leinwand mit ca. 70 Kettfäden/cm und ca. 37 Schussfäden/cm mit einem Flächengewicht von 100 g/m2 verarbeitet. Die kohlenstoffhaltigen elektrisch leitenden Fasern wurden in Form eines Gitters mit den Maßen 5 x 5 mm eingearbeitet.The microfiber web was made from polyester microfibers having a fiber density of 1 dtex and carbonaceous fibers (Belltron B31, available from Kanebo Gohsen Ltd., Japan). The fibers were made into a canvas with about 70 warp threads / cm and about 37 weft threads / cm with a basis weight of 100 g / m 2 . The carbonaceous electroconductive fibers were incorporated in the form of a grid measuring 5 × 5 mm.

Die Mikrofaserbahn hatte eine Luftdurchlässigkeit von ca. 15 l/min pro dm2 und einen elektrostatischen Oberflächenwiderstand von ca. 1 x 108 Ohm (nach DIN 100015-1 bei 25 % rel. Luftfeuchte und 23 °C). Die Reißfestigkeiten betrugen ca. 850 N in Kette und ca. 650 N im Schuss.The microfiber web had an air permeability of about 15 l / min per dm 2 and an electrostatic surface resistance of about 1 x 10 8 ohms (according to DIN 100015-1 at 25% relative humidity and 23 ° C). The tensile strengths were about 850 N in warp and about 650 N in the weft.

Für das Beispiel wurde die Mikrofaserbahn über einen Spannrahmen geführt.For the example, the microfiber web was passed over a tenter.

20 g/l Silastol WK (erhältlich von der Fa. Schill + Seilacher, DE) wurden zunächst durch Foulardapplikation auf die Mikrofaserbahn aufgebracht, um die Hydrophilie anzupassen. Nach der Foulardapplikation wurde die Mikrofaserbahn bei 80 °C getrocknet.20 g / l of Silastol WK (available from Schill + Seilacher, DE) were first applied to the microfiber web by padding to adjust the hydrophilicity. After Foulardapplikation the microfiber web was dried at 80 ° C.

Anschließend wurde die Mikrofaserbahn durch Foulardierung mit 10 g/l Evoral O 35 (Fluorpolymer; erhältlich von der Fa. Schill + Seilacher, DE) imprägniert. Die Mikrofaserbahn wurde 90 s bei 60 °C getrocknet. Es kam nicht zu einer Orientierung der Moleküle des Fluorpolymers. Die aufgebrachte Menge an Evoral betrug ca. 0,7 g/100 g Mikrofaserbahn.Subsequently, the microfiber web was impregnated by padding with 10 g / l Evoral O 35 (fluoropolymer, available from the company Schill + Seilacher, DE). The microfiber web was dried at 60 ° C. for 90 s. There was no orientation of the molecules of the fluoropolymer. The applied amount of Evoral was about 0.7 g / 100 g microfiber web.

Nach der Trocknung wurde eine polyurethanhaltige Beschichtung auf die Mikrofaserbahn aufgerakelt. Die Beschichtungszusammensetzung wies die folgende Zusammensetzung auf: 50 Teile Impranil DLP-R, Bayer (Polymerdispersion) 0,2 Teile Agitan 218, Münzing Chemie (Entlüfter) 0,4 Teile Afrotin FG, Schill + Seilacher (Fungizid) 0,4 Teile Byk 333, Byk Chemie (Additiv zur Erhöhung der Kratzbeständigkeit) 0,8 Teile Tegophobe 1650, Degussa (Hydophobierungsmittel) 1,2 Teile kolloidale Kieselsäure 41,7 Teile Wasser 0,3 Teile Rheolate 255, Elementis (Verdicker) 4,2 Teile Evoral, Schill+Seilacher (Fluorpolymer) 0,8 Teile Hombitec RM 400, Sachtleben Chemie (Mattierungsmittel) After drying, a polyurethane-containing coating was knife-coated onto the microfiber web. The coating composition had the following composition: 50 parts Impranil DLP-R, Bayer (polymer dispersion) 0.2 parts Agitan 218, Münzing Chemie (deaerator) 0.4 parts Afrotin FG, Schill + Seilacher (fungicide) 0.4 parts Byk 333, Byk Chemie (Additive for increasing scratch resistance) 0.8 parts Tegophobe 1650, Degussa (water repellent) 1.2 parts colloidal silica 41.7 parts water 0.3 parts Rheolate 255, Elementis (thickener) 4.2 parts Evoral, Schill + Seilacher (Fluoropolymer) 0.8 parts Hombitec RM 400, Sachtleben chemistry (matting agent)

Die Anmischung erfolgte unter Zugabe in der obengenannten Reihenfolge mit Hilfe eines Dissolvers. Die Rührzeit betrug 35 Minuten. Die hergestellte Paste wurde mittels einer Luftrakel flächig als geschlossener Film auf die Mikrofaserbahn aufgebracht.The addition was carried out by adding in the above-mentioned order with the aid of a dissolver. The stirring time was 35 minutes. The paste produced was applied by means of an air knife surface as a closed film on the microfiber web.

Die beschichtete Mikrofaserbahn wurde in einem Spannrahmen in fünf Feldern mit je 3 m Länge und einer Gesamtzeit von 2 min stufenweise getrocknet. Trocknung Feld 1: 80 °C Trocknung Feld 2: 120 °C Trocknung Felder 3 bis 5: 160 °C The coated microfiber web was dried stepwise in a tenter frame in five 3 m long sections for a total of 2 minutes. Drying field 1: 80 ° C Drying field 2: 120 ° C Drying fields 3 to 5: 160 ° C

Die erhaltene Mikrofaserbahn wurde nach DIN EN 13795-2 untersucht, um ihre Eignung als Abdeckung von Röntgenschutzmaterial im OP Bereich zu klären. (KbE = Koloniebildende Einheiten).The resulting microfiber web was examined in accordance with DIN EN 13795-2 in order to clarify its suitability as a cover for X-ray protective material in the OR area. (KbE = colony-forming units).

Barriereeigenschaften: Barrier properties :

Bakterienpenetration trocken:Dry bacterial penetration: log10KbE: 0log 10 CU: 0 Flüssigkeitsdurchtritt:Liquid passage: > 200 cm> 200 cm

Reinheit: Purity :

mikrobiologisch:microbiologically: log10(KbE/dm2): < 0,3log 10 (KbE / dm 2 ): <0.3 Partikuläres Material:Particulate material: Index Partikuläres Material < 3,3Index Particulate material <3.3 Partikelfreisetzung:Particle release: log10-Partikel (2 - 25 µm) < 3,7log 10 particles (2 - 25 μm) <3.7

Festigkeit:Strength:

Berstfestigkeit trocken:Dry bursting strength: > 750 kPa> 750 kPa Berstfestigkeit nass:Bursting strength wet: > 750 kPa> 750 kPa Reißfestigkeit: trocken:Tear resistance: dry: > 750 N/5 cm> 750 N / 5 cm Reißfestigkeit: nass:Tear resistance: wet: > 680 N/5 cm> 680 N / 5 cm

Die Messwerte zeigen, dass das Material hervorragend als Textil im OP-Bereich eingesetzt werden kann.The measured values show that the material can be used excellently as a textile in the surgical area.

Das in Beispiel 1 von WO 2005/024846 hergestellte bleifreie Strahlenschutzmaterial wurde in Form einer Strahlenschutzschürze geschnitten. Die vorstehend hergestellte beschichtete Mikrofaserbahn wurde entsprechend zugeschnitten und beidseitig auf das Strahlenschutzmaterial gelegt, wobei die mit Polyurethan beschichtete Seite dem Strahlenschutzmaterial zugewandt war. Die Mikrofaserbahnen und das Strahlenschutzmaterial wurden miteinander vernäht, so dass eine Strahlenschutzschürze erhalten wurde. Die Strahlenschutzschürze vermittelte durch die Verwendung der beschriebenen Mikrofaserbahn ein angenehmes Tragegefühl. Hautreizungen wurden vermieden. Außerdem dient die beschriebene Mikrofaserbahn als Schutzbarriere für das sensible Strahlenschutz-Inlay. Die Strahlenschutzschürze wies eine hervorragende Dichtheit gegen Blut, Urin und Mikroorganismen auf. Sie konnte außerdem ohne Beschädigung durch Ethylenoxid sterilisiert werden. Folglich ist die Strahlenschutzschürze sehr gut für den Einsatz im medizinischen Bereich geeignet.That in Example 1 of WO 2005/024846 manufactured lead-free radiation protection material was cut in the form of a radiation protection apron. The coated microfiber web prepared above was cut to size and placed on both sides of the radiation protection material with the polyurethane-coated side facing the radiation protection material. The microfiber webs and the radiation protection material were sewn together, so that a radiation protection apron was obtained. The radiation protection apron mediated by the use of the described microfiber web a comfortable fit. Skin irritation was avoided. In addition, the described microfiber web serves as a protective barrier for the sensitive radiation protection inlay. The radiation protection apron had an excellent tightness against blood, urine and microorganisms. It also could be sterilized without damage from ethylene oxide. Consequently, the radiation protection apron is very well suited for use in the medical field.

Claims (25)

  1. Use of a coated microfibrous web comprising:
    (i) a microfibrous web impregnated with a fluoropolymer; and
    (ii) a layer comprising polyurethane which is present only on one side of the microfibrous web,
    or of a coated microfibrous web obtainable according to the process comprising the following steps:
    (a) providing a microfibrous web;
    (b) impregnating the microfibrous web with an impregnation composition comprising fluoropolymer;
    (c) drying the impregnated microfibrous web;
    (d) applying a coating composition comprising polyurethane to only one side of the dried, impregnated microfibrous web; and
    (e) thermal treatment of the coated microfibrous web obtained in step (d),
    as a covering of a radiation protection material;
    wherein the coated microfibrous web is provided on at least one side of the radiation protection material and wherein the side coated with polyurethane is adjacent to the radiation protection material.
  2. Use according to claim 1, wherein the fluoropolymer is present in an amount of 0.2 g to 5 g, based on 100 g of the uncoated microfibrous web.
  3. Use according to claim 1 or 2, wherein the thickness of the layer comprising polyurethane is 3 g/m2 to 50 g/m2.
  4. Use according to any of claims 1 to 3, wherein the layer comprising polyurethane furthermore comprises fluororesin in an amount of 3 parts by weight to 30 parts by weight, based on 100 parts by weight of polyurethane.
  5. Use according to any of claims 1 to 4, wherein the layer comprising polyurethane furthermore comprises silicon dioxide in an amount of 1 part by weight to 10 parts by weight, based on 100 parts by weight of polyurethane.
  6. Use according to any of claims 1 to 5, wherein the fluoropolymer is obtainable by polymerizing perfluoroalkyl-containing acrylates of the formula

            H2C=CR-C(O)-O-(CH2)n-CmF2m+1

    wherein
    R is H or CH3;
    n is 0 to 8; and
    m is 4 to 12.
  7. Use according to claim 6, wherein the fluoropolymer is a copolymer obtainable by copolymerizing perfluoroalkyl-containing acrylates with
    (i) at least one alkyl-containing acrylate of the formula

            H2C=CR-C(O)-O-CpH2p+1

    wherein
    R is H or CH3; and
    p is 1 to 12;
    and/or
    (ii) at least one functional monomer of the formula

            H2C=CR-C(O)-O-CpH2pX

    wherein
    R is H or CH3;
    p is 1 to 12; and
    X is a functional group selected from OH, SH, NH2, and N-methylolsulfonamide.
  8. Use according to claim 1, wherein the drying in step (c) is carried out at a temperature in the range of 40 °C to 110 °C for a time period of 10 s to 240 s.
  9. Use according to claim 1 or 8, wherein the thermal treatment in step (e) is carried out at a temperature in the range of 120 °C to 190 °C for a time period of 10 s to 240 s.
  10. Use according to claim 1, wherein the drying of the impregnated microfibrous web in step (c) is carried out such that the molecules of the fluoropolymer statistically deposit on the microfibrous web and no reorientation of the fluoropolymer molecules takes place.
  11. Use according to claim 1 or 10, wherein the thermal treatment in step (e) is carried out such that a reorientation of the fluoropolymer molecules takes place wherein the hydrophobic fluorine atoms preferably arrange themselves on the surface of the layer.
  12. Radiation protection device comprising:
    (α) a radiation protection material; and
    (β) a coated microfibrous web comprising:
    (i) a microfibrous web impregnated with a fluoropolymer; and
    (ii) a layer comprising polyurethane which is present only on one side of the microfibrous web,
    or a coated microfibrous web obtainable according to the process comprising the following steps:
    (a) providing a microfibrous web;
    (b) impregnating the microfibrous web with an impregnation composition comprising fluoropolymer;
    (c) drying the impregnated microfibrous web;
    (d) applying a coating composition comprising polyurethane to only one side of the dried, impregnated microfibrous web; and
    (e) thermal treatment of the coated microfibrous web obtained in step (d),
    wherein the coated microfibrous web is provided on at least one side of the radiation protection material and wherein the side coated with polyurethane is adjacent to the radiation protection material.
  13. Radiation protection device according to claim 12, wherein the fluoropolymer is present in an amount of 0.2 g to 5 g, based on 100 g of the uncoated microfibrous web.
  14. Radiation protection device according to claim 12 or 13, wherein the thickness of the layer comprising polyurethane is 3 g/m2 to 50 g/m2.
  15. Radiation protection device according to any of claims 12 to 14, wherein the layer comprising polyurethane furthermore comprises fluororesin in an amount of 3 parts by weight to 30 parts by weight, based on 100 parts by weight of polyurethane.
  16. Radiation protection device according to any of claims 12 to 15, wherein the layer comprising polyurethane furthermore comprises silicon dioxide in an amount of 1 part by weight to 10 parts by weight, based on 100 parts by weight of polyurethane.
  17. Radiation protection device according to any of claims 12 to 16, wherein the fluoropolymer is obtainable by polymerizing perfluoroalkyl-containing acrylates of the formula

            H2C=CR-C(O)-O-(CH2)n-CmF2m+1

    wherein
    R is H or CH3;
    n is 0 to 8; and
    m is 4 to 12.
  18. Radiation protection device according to claim 17, wherein the fluoropolymer is a copolymer obtainable by copolymerizing perfluoroalkyl-containing acrylates with
    (i) at least one alkyl-containing acrylate of the formula

            H2C=CR-C(O)-O-CpH2p+1

    wherein
    R is H or CH3; and
    p is 1 to 12;
    and/or
    (ii) at least one functional monomer of the formula

            H2C=CR-C(O)-O-CpH2pX

    wherein
    R is H or CH3;
    p is 1 to 12; and
    X is a functional group selected from OH, SH, NH2, and N-methylolsulfonamide.
  19. Radiation protection device according to claim 12, wherein the drying in step (c) is carried out at a temperature in the range of 40 °C to 110 °C for a time period of 10 s to 240 s.
  20. Radiation protection device according to claim 12 or 19, wherein the thermal treatment in step (e) is carried out at a temperature in the range of 120 °C to 190 °C for a time period of 10 s to 240 s.
  21. Radiation protection device according to claim 12, wherein the drying of the impregnated microfibrous web in step (c) is carried out such that the molecules of the fluoropolymer statistically deposit on the microfibrous web and no reorientation of the fluoropolymer molecules takes place.
  22. Radiation protection device according to claim 12 or 21, wherein the thermal treatment in step (e) is carried out such that a reorientation of the fluoropolymer molecules takes place wherein the hydrophobic fluorine atoms preferably arrange themselves on the surface of the layer.
  23. Radiation protection device according to any of claims 12 to 22, wherein the radiation protection material is suitable for shielding against X-ray radiation.
  24. Radiation protection device according to any of claims 12 to 23, wherein the radiation protection material does not contain lead.
  25. Radiation protection device according to any of claims 12 to 24, wherein the coated microfibrous web is provided on both sides of the radiation protection material and wherein on each side the sides coated with polyurethane are adjacent to the radiation protection material.
EP20100741954 2009-08-14 2010-08-10 Use of a coated microfiber web as a cover of a radiation protection material Active EP2464781B1 (en)

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US23401409P 2009-08-14 2009-08-14
DE102009037565A DE102009037565A1 (en) 2009-08-14 2009-08-14 Coated microfiber web and method of making the same
PCT/EP2010/061631 WO2011018459A1 (en) 2009-08-14 2010-08-10 Coated microfibrous web and method for producing the same

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JP2013501859A (en) 2013-01-17
US20120181458A1 (en) 2012-07-19
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CN102471992A (en) 2012-05-23
JP5668065B2 (en) 2015-02-12

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