US20110081542A1 - Substrate with antimicrobial properties - Google Patents

Substrate with antimicrobial properties Download PDF

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Publication number
US20110081542A1
US20110081542A1 US11/721,688 US72168805A US2011081542A1 US 20110081542 A1 US20110081542 A1 US 20110081542A1 US 72168805 A US72168805 A US 72168805A US 2011081542 A1 US2011081542 A1 US 2011081542A1
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Prior art keywords
substrate
antimicrobial
process according
glass
iii
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US11/721,688
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English (en)
Inventor
Georges Pilloy
Christophe Ego
Jean-Pierre Poels
Muriel Tournay
Andre Hecq
Kadosa Hevesi
Nadia Jacobs
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AGC Glass Europe SA
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AGC Glass Europe SA
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Assigned to GLAVERBEL reassignment GLAVERBEL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EGO, CHRISTOPHE, HECQ, ANDRE, PILLOY, GEORGES, HEVESI, KADOSA, TOURNAY, MURIEL, JACOBS, NADIA
Assigned to AGC FLAT GLASS EUROPE SA reassignment AGC FLAT GLASS EUROPE SA CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: GLAVERBEL
Publication of US20110081542A1 publication Critical patent/US20110081542A1/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/06—Surface treatment of glass, not in the form of fibres or filaments, by coating with metals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/16—Heavy metals; Compounds thereof
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
    • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
    • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/008—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in solid phase, e.g. using pastes, powders
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
    • C03C23/0095—Solution impregnating; Solution doping; Molecular stuffing, e.g. of porous glass
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5806—Thermal treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5893—Mixing of deposited material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/08—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of metallic material
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2204/00—Glasses, glazes or enamels with special properties
    • C03C2204/02—Antibacterial glass, glaze or enamel
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/20—Materials for coating a single layer on glass
    • C03C2217/25—Metals
    • C03C2217/251—Al, Cu, Mg or noble metals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/44—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the composition of the continuous phase
    • C03C2217/45—Inorganic continuous phases
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/40—Coatings comprising at least one inhomogeneous layer
    • C03C2217/43—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase
    • C03C2217/46—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase
    • C03C2217/47—Coatings comprising at least one inhomogeneous layer consisting of a dispersed phase in a continuous phase characterized by the dispersed phase consisting of a specific material
    • C03C2217/475—Inorganic materials
    • C03C2217/479—Metals
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/10—Deposition methods
    • C03C2218/15—Deposition methods from the vapour phase
    • C03C2218/154—Deposition methods from the vapour phase by sputtering
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/30—Aspects of methods for coating glass not covered above
    • C03C2218/32—After-treatment
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/27—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
    • Y10T428/273—Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.] of coating
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Definitions

  • the present invention relates to a Substrate, in particular glass-type substrate or metallic substrate, wherein at least one of its surfaces has antimicrobial, in particular antibacterial or antifungal, properties.
  • the present invention also relates to a process for the production of such a substrate.
  • EP 653 161 describes the possibility of covering these with a glaze composed of silver to provide them with antibacterial properties.
  • sol-gel type processes are known to provide an antimicrobial surface. These processes require a hardening stage of the sol-gel layer, which involves elevated temperatures in the order of 500°-600° C. (sintering temperature). Processes are also known that require the substrate to be dipped in a composition comprising a silver salt. In this case, a silver layer is not deposited, but an ion exchange takes place in the solution at an elevated temperature.
  • a process for producing a glass substrate having antimicrobial properties is also known from EP 1449816.
  • This process requires both a drying stage between 20° and 105° C. and a thermal treatment at 600°-650° C.
  • This thermal treatment has some disadvantages particularly with respect to cost and uniformity of the product. Moreover, it renders the process very poorly reproducible, since it has been found that at these temperatures the diffusion of the silver is very rapid and a slight variation in the duration of the thermal treatment results in a significant variation in the depth of diffusion of the silver, and therefore this causes variation in the antibacterial properties of the substrate. It may also be noted that such a thermal treatment causes an undesirable yellow colouration of a soda-lime glass substrate. Furthermore, with this process, after having been treated, the product may no more be cut into particular size because of the necessary tempering process.
  • the present invention relates to a process for the production of a substrate (in particular glass or metallic substrate) having antimicrobial properties, characterised in that it comprises the following steps:
  • the process is characterised in that it comprises the following sequential steps:
  • the antimicrobial agent can diffused under the surface, toward the centre of the substrate, if no coating is applied or in an undercoat, or in a topcoat, in case those coating are applied on the substrate.
  • an undercoat can advantageously comprise a first layer, having the functions of blocking or slowing down the migration of the antimicrobial agent and a second layer serving as a reservoir for the antimicrobial agents.
  • Those functions can be ascertained on a product made according to the invention by comparing the antimicrobial effect of similar products with and without undercoating and/or by analysing diffusion profiles (see FIGS. 1 and 2 ).
  • Each layer of the undercoat may in particular have a thickness comprised between 5 and 1000 nm, preferably between 8 and 800 nm, most preferably between 10 and 600 nm.
  • the substrate may be a sheet of flat glass, particularly soda-lime glass which may be float glass. It may be clear glass. The glass may have a thickness within the range of 2.5 to 12 mm. It may be clear glass or coloured glass. It may comprise a reflective layer (to form a mirror) or a layer of enamel or painting (for wall covering), generally at the surface opposite to the antimicrobial surface.
  • the substrate may have a surface area of greater than 0.8 m to 0.8 m; it may be adapted to be cut to a finished size by a subsequent cutting operation.
  • the maximum temperature of the heat treatment is preferably the glass transition temperature which is in the order of 550° C.
  • the temperature of the thermal treatment is lower than 450° C., preferably lower than 380° C. and particularly preferred lower than 350° C., and advantageously higher than 200° C., preferably higher than 220° C. and particularly preferred higher than 240° C.
  • the duration of the thermal treatment must be adjusted in accordance with the selected temperature. In particular, it is found that a duration in the range of between 2 minutes and 2 hours may be appropriate, preferably between 5 minutes and 1 hour, and particularly preferred between 7 and 40 minutes.
  • a particularly advantageous temperature-duration combination has proved to be a temperature in the range between 200° and 350° C. over a period varying from 10 to 30 minutes.
  • the antimicrobial agent can be selected from various inorganic agents known for their antimicrobial properties, in particular silver, copper and zinc.
  • the antimicrobial agent is in metallic form.
  • the process according to the invention advantageously comprises an additional step (iii), which consists of eliminating any excess antimicrobial agent remaining on the surface, i.e. that has not diffused during the thermal treatment step (ii).
  • This elimination can be achieved by washing.
  • solutions based on HNO 3 , FeCl 3 or Fe(NO 3 ) 3 are suitable for such a washing process.
  • This washing can prevent any antimicrobial agents from remaining on the surface in metallic form in such a quantity that they could cause the treated surface to become too reflective.
  • it is preferred that the substrate treated according to the invention does not exhibit any significant increase in light reflection (LR), or any significant reduction in light transmission (LT) in relation to the untreated substrate.
  • a very low quantity of antimicrobial agent can be deposited on said at least one surface of the substrate.
  • a quantity of more than 5 mg/m 2 , preferably more than 20 mg/m 2 and particularly preferred more than 35 mg/m 2 of surface to be treated can be appropriate.
  • concentrations 800 or 900 mg/m2
  • deposition is possible by pyrolytic spraying, by sputtering or by a method similar to the method used for the production of mirrors, which comprises spraying of a salt of an antimicrobial agent such as AgNO 3 and precipitation by reduction of the antimicrobial agent in metal form.
  • deposition is possible by pyrolytic spraying, by sputtering or by a method similar to the method used for the production of mirrors, which comprises spraying of a salt of an antimicrobial agent such as AgNO 3 and precipitation by reduction of the antimicrobial agent in metal form.
  • glass substrate can be considered, depending on the applications sought.
  • glass that is coloured, frosted or patterned etc. can also be used.
  • the glass sheets can be treated on one or on both their faces.
  • the face opposite the treated face can be subjected to any desired type of surface treatment.
  • a coating of paint or enamel or a reflective layer can be applied thereon, e.g. for applications such as wall coverings or mirrors.
  • the invention also relates to a glass substrate comprising an antimicrobial agent present at or diffused into or under at least one of its exposed surfaces, such that the ratio I(CsAg)/I(CsSi) in the surface (measured according to the dynamic SIMS method) is higher than 0.015, preferably higher than 0.020 and particularly preferred higher than 0.025.
  • the quantity of antimicrobial agents present or diffused into at least one of its surfaces is advantageously more than 0.1 mg/m 2 , preferably more than 1 mg/m 2 and particularly preferred more than 10 mg/m 2 of antimicrobial surface.
  • I(CsAg)/I(CsSi) ratio is measured using a Cameca ims-4-f apparatus.
  • I(CsAg) is the peak intensity obtained for the CsAg + ions
  • I(CsSi) is the peak intensity obtained for CsSi + ions after bombardment of the surface of the substrate by a Cs + ion beam, which progressively scours the surface of the sample.
  • the energy of the Cs + ion beam reaching the substrate is 5.5 keV.
  • the angle of incidence of the beam is 42° to the normal of the substrate.
  • the surface values indicate that the values are taken for as small a depth as possible, as soon as the value obtained is significant.
  • the first significant values can correspond to maximum depths of about 1 to 5 nm.
  • the surface values correspond to a maximum depth of 2 nm.
  • the ratio of isotopes Ag107/Ag109 must in particular be close to the theoretical value (1.0722), in particular be in the range of between 1.01 and 1.13.
  • a substrate having antimicrobial agents present at least one exposed surface may be an annealed sheet of glass.
  • the term annealed sheet of glass is used herein to mean that the glass may be cut to size without breaking in the way that a tempered or hardened sheet of glass would break upon cutting.
  • Such an annealed sheet of glass preferably has a surface compression of less than 5 MPa.
  • the invention also relates to metallic or other substrates comprising antimicrobial agents present at or diffused into or under at least one of its exposed surface at an atomic % preferably greater than 1% more, preferably greater than 1.5%, most preferably greater than 2%.
  • the substrate according to the invention has an antibacterial effect on a large number of bacteria, whether gram positive or gram negative bacteria, in particular on at least one of the following bacteria: Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Enterococcus hirae .
  • the antibacterial effect measured in accordance with the standard JIS Z 2801 is in particular, at least on any one of these bacteria, higher than log 1, preferably higher than log 2 and particularly preferred higher than log 2.5.
  • the substrate will be considered bactericidal according to the standard HS Z 2801 if it has an effect higher than log 2.
  • the invention also relates to substrates that have a lesser effect (for example a bacteriostatic effect, which means that the bacteria are not necessarily killed but can not developed anymore).
  • the substrate according to the invention advantageously has an antifungal (fungicidal or fungistatic) effect on any one fungus, in particular Candida albicans or Aspergillus niger.
  • the glass substrate used is a clear glass, it can advantageously have antimicrobial properties as well as a neutral colouration in reflection.
  • the colorimetric indexes (CIELAB system) in reflection a* and b* are in the range of between ⁇ 10 and 6, preferably between ⁇ 5 and 3 and particularly preferred between ⁇ 2 and 0, and the purity may be less than 15%, preferably less than 10% and particularly preferred less than 5%.
  • the substrate is a coloured glass, it can be considered that antimicrobial properties may be obtained without changing very much the initial colour of the substrate.
  • a DeltaE*lower than 3, preferably lower than 2 may be obtained for an antimicrobial substrate according to the invention.
  • the glass substrate used is a clear glass, it can advantageously have both antimicrobial properties and a visible light absorption of less than 1.5%, preferably less than 1.4% and particularly preferred less than 1.3%. It may have a visible light transmission within the range of 80 to 91%, preferably 84 to 90%. And the visible light reflection may be less than 15%, preferably less than 12%, most preferably less than 10%.
  • the substrate according to the invention preferably has in particular an antimicrobial effect after any one of the following accelerated ageing tests: wet spray test (test over 20 days in a chamber with a humidity of more than 95% at 40° C.), after 500 hours of UV irradiation (4 340A ATLAS lamps, chamber at 60° C.), after 24 hours immersed in a solution of H 2 SO 4 (0.1 N), after 24 hours immersed in a solution of NaOH (0.1 N).
  • FIGS. 1 a to 1 h show diffusion profiles of silver into the surface of the substrate for samples obtained using the procedure of Example 1 (deposition of the silver layer by spraying);
  • FIG. 2 shows a diffusion profile of silver into the surface of the substrate for a sample obtained using the procedure of Example 2 (deposition by precipitation of a silver layer by reduction of the corresponding salt).
  • Samples of clear soda-lime glass were coated with a silver layer using the vacuum deposition method, also referred to as magnetron sputtering, in a manner known per se using a silver metal target in an atmosphere of argon.
  • the quantity of silver deposited was 40 mg/m 2 of surface treated for sample 1.a (4 mm thick glass) and 100 mg/m 2 of surface treated for samples 1.b to 1.e (2 mm thick glass).
  • the samples were then subjected to a thermal treatment in the conditions (duration and temperature) specified in Table 1.
  • the treated samples were then washed in acid to eliminate any excess silver remaining in the surface that had therefore not diffused during the thermal treatment.
  • the aim is to eliminate any trace of silver on the surface (mainly metallic Ag) and thus obtain a clear glass without eliminating the silver that has lightly diffused into the surface.
  • Solutions of HNO 3 , FeCl 3 or Fe(NO 3 ) 3 are suitable for such a washing process.
  • FIGS. 1 . a to 1 . e show the quantity of silver diffused into the surface of the substrate as a function of the depth (d) in the substrate.
  • the quantity of silver is estimated by measuring the I(CsAg)/I(CsSi) ratio obtained by dynamic SIMS.
  • I(CsAg) is the peak intensity obtained for the CsAg + ions
  • I(CsSi) is the peak intensity obtained for the CsSi + ions after bombardment of the surface of the substrate by a Cs + ion beam using a Cameca ims-4-f apparatus (beam of 5.5 keV and angle of incidence of 42° to the normal of the substrate).
  • a log 1 level indicates that 90% of the bacteria inoculated onto the surface of the glass were killed in 24 hours in the conditions of the standard; log 2 indicates that 99% of the bacteria were killed; log 3 indicates that 99.9% of the bacteria deposited were killed, etc.
  • Sample 1.a has an appearance that is neutral in reflection.
  • Sample 1.c also has an appearance that is neutral in reflection.
  • Samples of clear soda-lime glass 4 mm thick were coated with a silver layer by chemical deposition using a method similar to that used to produce mirrors.
  • the samples were firstly subjected to a step of sensitisation using tin chloride solution.
  • An aqueous solution of AgNO 3 was then sprayed onto the surface of the glass at a flow rate of 200 ml/min along with a reducing agent to reduce the silver salt into metallic silver. The excess was then rinsed off.
  • Quantities of 100 to 800 mg of Ag/m 2 were deposited onto one face of the glass substrates.
  • the different samples were then subjected to different thermal treatments for a period of 10 to 30 minutes at temperatures varying from 250° to 350° C. (see Table 2).
  • Example 1 The treated samples were then washed in acid to eliminate the excess silver remaining in the surface as in Example 1.
  • the diffusion profile of sample 2.d is shown in FIG. 2 .
  • Samples of clear soda-lime glass 6 mm thick were coated with a layer of silver by means of pyrolytic spraying.
  • a solution of AgNO 3 was sprayed for 5 seconds onto samples preheated at temperatures from 300° to 400° C. The solution pyrolysed on contact with the hot substrate and formed a film of metallic silver.
  • the two steps of depositing the antimicrobial agent and its diffusion into the surface were virtually simultaneous since the substrate was preheated.
  • the process could be used during the continuous production of float glass.
  • the spraying of silver could be arranged after the tin bath and could be conducted either before the ribbon of glass enters the annealing lehr or in the actual annealing lehr.
  • Samples of clear soda-lime glass were coated with one or two layers of different metal oxides or oxycarbides with a thickness varying between 13 and 500 inn, using pyrolytic deposition.
  • the nature and thicknesses of the layers are collated in Table 3 below.
  • a layer of silver (100 to 500 mg/m 2 ) was deposited on the last layer of the substrate and a tempering thermal treatment was applied (temperature: 680° C., duration 6 minutes).
  • the presence of the coating layer may reduce the variability of the antimicrobial effect of the finished product to variations in the heat treatment process.
  • it may provide a surface or material that is better adapted to contain the antimicrobial agent that the surface of the substrate.
  • a first thermal treatment is conducted at low temperature and for a short period (e.g. from 250° to 400° C. for 5 to 30 minutes) in order to cause the antimicrobial agent to diffuse into the layer or layers.
  • the result is a glass sheet that can be cut to a desired size and then tempered in a subsequent process.
  • the coated samples were subjected to a tempering process (670° C. during 10 minutes).
  • the bactericidal properties of the sample was analysed in accordance with standard JIS Z 2801. A log 2.58 was obtained. This indicates that good bactericide properties were obtained simultaneously with tempering characteristics.
  • the coated sample was subjected to a tempering process (670° C. during 10 minutes).
  • the bactericidal properties of the sample were analysed in accordance with standard JIS Z 2801. A log 2.63 was obtained. This indicates that good bactericide properties were obtained simultaneously with tempering characteristics. This suggests that a certain amount of silver migrated during the tempering step in the topcoat and that the NiCr layer played a barrier function for the migration of Ag toward the substrate.
  • Samples of steel were coated with a silver layer using the vacuum deposition method as in example 1.
  • a first sample was a galvanized steel of the commercial type “ST37” with a thickness of 1.5 mm.
  • the second one was a sample of steel laminated under cold condition and without oil of a thickness of 0.2 mm.
  • the samples were coated using a silver metal target in an atmosphere of argon.
  • the quantity of silver deposited was 100 mg/m2 of the surface treated.
  • the samples were subjected to a thermal diffusion process at 320° C. during 10 min.
  • a coating layer may be provided at the surface to receive or contain the antimicrobial agent.
  • Coating layers selected from one or more of a titanium oxide, a titanium nitride and a zirconium oxide may be particularly suitable.
  • the use of coating layers selected from one or more of silicon oxide, a silicon nitride, a tin oxide, a zinc oxide, a zirconium oxide, a titanium oxide, a titanium nitride and an aluminium nitride may be used.
  • a double coating layer may be used, for example, substrate/zirconium oxide/titanium oxide.

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US20130309288A1 (en) 2013-11-21
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ATE497938T1 (de) 2011-02-15
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