Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/18—Reinforcing agents
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/20—Macromolecular organic compounds
  • D21H17/33—Synthetic macromolecular compounds
  • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
  • D21H17/375—Poly(meth)acrylamide
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
  • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
  • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
  • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents

Definitions

• the present invention relates to the field of paper and more particularly that of bank notes. It aims more precisely to provide a paper substrate with sufficient mechanical strength to prevent banknotes, made from this substrate, from suffering too high a microbial load during their aging in circulation.
• banknotes are very damaged and very dirty.
• end of life makes it possible to highlight a phenomenon of physicochemical modification of banknotes in extensive circulation and intense mechanical degradation.
• banknotes are soft because they lack their original characteristic rigidity. Numerous tears completely through the thickness are present and we also observe numerous beginnings of peripheral tears on the edges of the notes.
• the paper is completely unstructured. It has numerous perforation points on the fatigue zones of the substrate subjected to repeated crumpling and folding. The internal structure of the note is severely dislocated; the fibers are loosened and this results in an increase in the porosity of the sheet such that the thickness of the most degraded banknotes is almost doubled compared to the thickness original. Surface treatments or coatings disappear or fragment, increasing the apparent porosity of the banknote surface.
• banknotes whose thickness is generally around 110 ⁇ m, quickly become more than 30 ⁇ m thick and their porosity can exceed 200 ml/min.
• these biocides allow effective protection of substrates against the development of germs, in particular the main families of bacteria and microscopic fungi, and also prevent the risk of cross-contamination by pathogenic germs (bacteria, molds and viruses), particularly during the exchange of tickets from hand to hand. This type of protection is effective in use on cuts throughout their circulation.
• the invention therefore aims to provide a substrate which addresses the problem of destructuring of the substrate during intense traffic and the associated undesirable effects described above. It particularly aims to offer banknotes that are effectively protected against a potential increase in their microbial load via a reduction in the phenomenon of increased porosity associated with their circulation.
• the present invention also aims to provide a fibrous substrate whose low level of porosity is not significantly altered after crumpling.
• the present invention further aims to provide a fibrous substrate provided with improved surface anti-fouling protection but also more at the core.
• the present invention also aims to guarantee sustainability of the antimicrobial effectiveness existing on bank notes. It aims in particular to significantly limit the level of microscopic microbial soiling.
• a fibrous substrate as defined above combines strongly reinforced resistance to destructuring with effective biocidal chemical protection made durable, including in difficult traffic conditions or when the recycling rate tickets is low.
• the substrate according to the invention has a porosity after crumpling which is at most equal to 50 ml/min, assessed according to standard ISO 5636-3.
• the substrate according to the invention has a Scott Bond internal cohesion, assessed according to the Tappi 569 om-09 standard or according to the ISO 16260 standard, greater than 1000 J/m 2 , in particular greater than 1300 J/m 2 , or even greater than 1500. J/m 2 .
• the anionic polymer is chosen from carboxylated styrene-butadiene copolymers.
• the fibrous substrate according to the invention is a cellulosic fibrous substrate, manufactured by the wet process, in particular by the papermaking process and as stated above it further comprises an anionic polymer in the precipitate state and at least one biocidal agent.
• the fibrous substrate according to the invention comprises from 1% to 20% by dry weight, preferably from 1% to 10% by dry weight, and more preferably from 3% to 8% by dry weight of anionic polymer(s). ), relative to the dry weight of fibers.
• This or these anionic polymer(s) is(are) present in the substrate according to the invention in a precipitated form on the surface of the fibers.
• precipitated form we mean that the anionic polymer is present in the form of a plurality of solid micro deposits, more precisely in the form of polymer particles distributed on the surface of the fibers constituting the fibrous substrate according to the invention. To confer optimal internal cohesion properties to the substrate, the distribution of the polymer particles on the fibers must be as homogeneous as possible.
• the anionic polymer suitable for the invention may be a homopolymer or a copolymer.
• an anionic polymer is a polymer carrying negative charges. It can derive from the anionic functionalization of so-called neutral polymers because they are uncharged.
• the anionic polymers suitable for the invention have a glass transition temperature greater than -40°C.
• glass transition temperature is meant the temperature below which the polymer is rigid. As the temperature increases, the polymer goes through a transition state that allows the macromolecular chains to slide relative to each other and the polymer softens.
• the anionic polymer present in the security sheet is a polymer having carboxylated functions.
• such a polymer is obtained by homo-polymerization of at least one monomer or co-polymerization of at least two monomers chosen from acrylic acid, methacrylic acid, acrylonitrile, acrylate alkyl, alkyl methacrylate, acrylamide, methacrylamide, N-methylol acrylamide, styrene and butadiene.
• the anionic polymer is chosen from acrylic homo- and co-polymers, acrylate homo- and co-polymers, carboxylated styrene-butadiene copolymers and mixtures thereof.
• said polymer is a carboxylated styrene-butadiene copolymer.
• Such copolymers are available, for example, from the Dow Chemical Company with different glass transition temperatures.
• the anionic polymer is a carboxylated styrene-butadiene copolymer, and preferably has a glass transition temperature ranging from -30°C to -20°C, in particular from -27°C to -23°C, and more preferably of the order of -25°C.
• this anionic polymer can also be non-carboxylated.
• anionic polymers As a representative of these other forms of anionic polymers, the anionic forms of polyacrylamides and polystyrene copolymers may be cited, such as in particular styrene-butadiene copolymers.
• the anionic polymer has a Tg greater than 23°C.
• the polymer(s) having a glass transition temperature greater than 23°C are chosen from polyacrylics, polyacrylates, polyacrylamides, anionic forms of polystyrenes, polyvinyls, polyethylenes, polyurethanes, and their mixtures.
• the polymer(s) having a glass transition temperature greater than 23°C are chosen from acrylic polymers (or polyacrylics), that is to say homopolymers or copolymers comprising at least one acrylic monomer, namely acrylic homopolymers or acrylic copolymers.
• the polymer(s) having a glass transition temperature greater than 23°C are chosen from acrylic homopolymers.
• the anionic polymer(s) may be non-crosslinkable, crosslinkable using an external crosslinker or even self-crosslinkable.
• the anionic polymer(s) are self-crosslinkable.
• the drying step can lead to crosslinking of the polymers, in a step subsequent to the implementation of the process according to the invention.
• anionic polyurethane mention may in particular be made of the anionic forms of polyurethane-polyesters, polyurethane-polyethers and polyurethane-polycarbonates and their mixtures.
• said anionic polyurethane is a polyurethane-polyester.
• said anionic polyurethane is not crosslinkable.
• a fibrous substrate according to the invention further comprises an effective quantity of at least one cationic precipitating agent.
• This cationic precipitation agent by modifying the electrostatic charge of the anionic cellulose fibers, allows, among other things, the fixation of the anionic polymer particles on the fibers.
• the term "effective quantity" means the quantity of cationic precipitating agent necessary to enable almost all, preferably all, of the anionic polymer to be precipitated on the surface of the fibers.
• This quantity of cationic precipitating agent must be considered with regard to the chemical nature of the associated polymer, in particular its ionicity, and can therefore vary.
• the cationic precipitating agent is chosen from polyaluminum chlorides, cationic polymers soluble in water, in particular from cationic starches, polyamides, polyacrylamides, polyethyleneimines, polyvinylamines and their mixtures.
• the cationic precipitating agent comprises at least one cationic resin.
• the cationic precipitating agent is chosen from polyamide resins, in particular from polyamide-polyamine-epichlorohydrin resins, called PAAE resins.
• the fibrous substrate comprises two cationic precipitating agents.
• the fibrous substrate comprises as cationic precipitation agent at least one polyamide-polyamine-epichlorohydrin resin and where appropriate at least one cationic polyacrylamide.
• the fibrous substrate according to the invention advantageously comprises from 0.5% to 5% by dry weight, in particular from 0.8% to 3.5% by dry weight of cationic precipitation agent(s), for example relative to the dry weight of fibers.
• the fibrous substrate according to the invention comprises fibers. These fibers can be natural, artificial and/or synthetic.
• the fibers used in the composition of the sheet comprise natural fibers.
• cellulosic fibers such as wood fibers, for example hardwood fibers, softwood fibers or their mixture, cotton fibers, bamboo fibers, straw fibers, abaca fibers, etc. 'asperto, hemp, jute, linen, sisal and their mixtures.
• Fibers can be bleached, semi-bleached or unbleached.
• the fibers used in the composition of the substrate comprise cellulosic fibers, in particular cotton fibers.
• Cotton fibers notably improve the mechanical resistance of the substrate, in particular resistance to bursting and resistance to tearing.
• the fibrous substrate according to the invention comprises from 40% to 96% by dry weight, preferably from 60% to 96% by dry weight, more preferably from 70% to 96% by dry weight of fibers, in particular cellulosic fibers, relative to the total dry weight of the fibrous substrate.
• the fibrous substrate according to the invention comprises at least 70% by dry weight of cellulosic fibers, relative to the dry weight of fibers.
• said cellulosic fibers are wood fibers.
• said cellulosic fibers are cotton fibers.
• said cellulosic fibers are a mixture of cotton fibers and wood fibers.
• the cotton fibers represent at least 50% by dry weight, relative to the dry weight of fibers, the remainder of the fibers being wood fibers, called short, based on hardwoods.
• the fibers included in the composition of the substrate may comprise synthetic fibers.
• the presence of synthetic fibers, mixed with cellulosic fibers, in the substrate according to the invention makes it possible to improve the tear resistance properties of said substrate.
• the fibers, in particular cotton fibers, considered as starting material can be in a previously anionized form, or their negative charge is previously increased in absolute value, by polymers capable of increasing the negative surface charge of fibers such as anionic polymers soluble in water and having an affinity with wood fibers.
• anionic polymers can be chosen from cellulose derivatives such as carboxymethylcellulose (CMC).
• the fibrous substrate according to the invention is free of glass fibers.
• the substrate is a bank note substrate.
• biocide covers any agent effective for regulating and/or inhibiting the growth of microorganisms such as viruses, fungi and bacteria.
• the biocide according to the invention can be chosen from bacteriostatic, bactericidal, fungistatic, fungicidal, virucidal agents and their mixtures.
• the biocide according to the invention is a mixture of at least two biocidal agents, one being a bacteriostatic and/or bactericidal agent and the other a fungistatic and/or fungicidal agent.
• the fibrous substrate according to the invention contains at least one bacteriostatic and/or bactericidal agent chosen from compounds based on chitosan or derived from chitin, based on quaternary ammonium, zinc zeolite, ions silver and triclosan and their mixtures.
• the fibrous substrate according to the invention contains at least one bacteriostatic and/or bactericidal agent based on didecyl dimethyl ammonium chloride.
• the fibrous substrate comprises at least didecyl dimethyl ammonium chloride or silver chloride, preferably at least silver chloride, as biocidal agent.
• silver chloride manifests, jointly with its bacteriostatic and/or bactericidal activity, a virucidal activity and therefore particularly interesting given the objective pursued by the present invention.
• the fibrous substrate according to the invention contains at least one fungistatic and/or fungicidal agent chosen from compounds based on isothiazoline or derivatives. isothiazolone, chitosan or chitin derivatives, quaternary ammonium, zinc zeolite, silver ions and triclosan.
• the fibrous substrate according to the invention contains at least one fungistatic and/or fungicidal agent based on p-[(Diiodomethyl)sulfonyl]toluol in the form of an aqueous dispersion.
• the fibrous substrate according to the invention contains at least one fungistatic and/or fungicidal agent based on iodopropynyl butylcarbamate in the form of an aqueous dispersion.
• the fibrous substrate according to the invention contains at least one fungistatic and/or fungicidal agent based on methyl-1H-benzimidazol-2-ylcarbamate in the form of an aqueous dispersion.
• the fibrous substrate according to the invention contains at least one virucide in particular of natural origin.
• the term “virucidal” designates any compound having the capacity to kill or inhibit viruses.
• the virucide according to the present invention is more particularly dedicated to killing and/or inhibiting a pathogenic virus against mammals and more particularly humans.
• Such viruses may be naked viruses or enveloped viruses.
• retroviruses As a representative of the viruses pathogenic for humans capable of being considered according to the invention, mention may more particularly be made of retroviruses, cytomegaloviruses, rotaviruses, paramyxoviruses, polioviruses, hantaviruses, coxsackie viruses, encephalomyocarditis, picornaviruses including rhinoviruses, DNA or RNA viruses including flaviviridae, AIDS virus, influenza viruses, smallpox virus, yellow fever virus, hepatitis C, herpes viruses, Epstein-Barr virus, varicella-zoster virus, rubella virus, simian virus 40 or SV40, or even coronaviruses.
• retroviruses cytomegaloviruses, rotaviruses, paramyxoviruses, polioviruses, hantaviruses, coxsackie viruses, encephalomyocarditis, picornaviruses
• virucide of natural origin is meant any virucide that pre-exists in nature or can be synthesized from natural compounds existing in nature.
• the virucides of natural origin which can be used in the context of the present invention can thus be obtained either by extraction and purification from a natural environment containing them, or by synthesis from natural compounds.
• virucides we can in particular cite monolaurin which can be obtained by synthesis from glycerol and lauric acid.
• monolaurin is intended to designate both naturally pre-existing monolaurin and that obtained by synthesis from glycerol and lauric acid.
• the virucide of natural origin can be chosen in particular from monolaurin, lactoferrin and essential oils exhibiting antiviral activity, such as for example laurel essential oil.
• the fibrous substrate according to the invention can contain an effective quantity of at least one virucide of natural origin, that is to say a sufficient quantity of it to endow the information medium incorporating it with properties antivirals.
• the fibrous substrate according to the invention may contain from 0.1 to 2.0% by dry weight, for example from 0.5 to 1.5% by dry weight, of virucide of natural origin relative to to its total weight.
• the biocide is at least monolaurin.
• the fibrous substrate comprises at least one pair of biocidal agents containing at least one 3-iodo-2-propynylbutyl carbamate, preferably in combination with at least didecyl dimethyl ammonium chloride or silver chloride, and more preferably in association with at least silver chloride.
• the fibrous substrate comprises at least one 3-iodo-2-propynylbutyl carbamate and silver chloride.
• Such a couple is particularly advantageous because of its bacteriostatic, bactericidal, fungistatic, fungicidal, yeasticidal and virucidal activity.
• the substrate according to the invention can be loaded in different ways with biocidal agent(s).
• They can also be present at a surfacing and/or coating layer deposited on at least one of the faces of the substrate.
• they can be present at least at the level of an ink printed on one of the faces of the substrate.
• they can be present at least at the level of a varnish, for example an overprint varnish, deposited on at least one of the faces of the substrate.
• a varnish for example an overprint varnish
• a fibrous substrate may contain as biocides at least one virucide of natural origin and at least one bacteriostatic and/or bactericidal agent and/or at least one fungistatic and/or fungicidal agent.
• the biocide When the biocide is monolaurin, it can be synthesized in situ in the medium dedicated to promoting the immobilization of the biocide at the substrate level, during its preparation process.
• Monolaurin is generated by reaction of lauric acid and glycerol in the presence of a catalyst, the catalyst preferably being a zeolite type catalyst or a lipase.
• the fibrous substrate according to the invention may further comprise at least one humectant.
• a humectant is a compound capable of providing a hydrating or even hygroscopic effect.
• polyol type compounds may be particularly considered, in the context of the present invention, such as, for example, glycerin, also called glycerol, propylene glycol, polyethylene glycol, butylene glycol, glyceryl triacetate, or even sorbitol.
• a fibrous substrate according to the invention may contain from 0.5 to 4% by dry weight, for example from 1 to 3% by dry weight of humectant(s), and in particular glycerol, relative to its total weight.
• the fibrous substrate according to the invention may further comprise at least one filler, in particular mineral.
• these fillers are intended in particular to increase the opacity, whiteness and/or printability of said fibrous substrate.
• the filler can be chosen from mineral fillers, in particular calcium carbonate, kaolin, titanium dioxide, talc, silicas, hydrated aluminas, aluminum silicates and their mixtures, and/or from organic fillers. , in particular plastic fillers or pigments.
• a fibrous substrate according to the invention may comprise from 2% to 25% by dry weight, preferably from 5% to 15% by dry weight of filler(s), relative to the dry weight of fibers.
• the invention also relates to a method of manufacturing a fibrous substrate according to the invention.
• said fibrous substrate is immersed during step d) or at the end of step d) in a solution containing at least one biocide with, if necessary, a consecutive drying operation.
• the surface of said fibrous substrate obtained at the end of step d) is sprayed with a solution containing at least one biocide
• said fibrous substrate obtained at the end of step d) is coated using a coating solution containing at least one biocide.
• At least one face of said substrate, obtained at the end of step d), is surfaced with a surfacing bath containing at least one biocide.
• said fibrous substrate obtained at the end of step d), and preferably having been consecutively coated and/or surfaced is printed using an ink containing at least one biocide.
• the application is carried out on at least one face of said fibrous substrate obtained at the end of step d), and preferably having been consecutively coated and/or surfaced and printed, an overprint varnish containing at least one biocide.
• these different modes of immobilization of the biocidal agent at the substrate level can, if necessary, be combined. However, these combinations must be compatible with the manifestation, at the substrate level, of the desired biocidal activity.
• said substrate is placed in contact with at least one pair of biocidal agents, in particular a pair of 3-iodo-2-propynylbutyl carbamate in association with at least didecyl dimethyl ammonium chloride or silver chloride, preferably silver chloride.
• This contacting is more particularly carried out in a single step.
• the substrate is impregnated simultaneously with the two biocides.
• the suspension used in step c) further comprises at least one charge retention agent and a mass bonding agent.
• Said manufacturing process according to the invention is a wet process, in particular a papermaking process. It is for example implemented on a single-jet paper machine with a flat table or round shape.
• said paper machine is a multi-jet paper machine comprising at least two sheet forming members, for example chosen from flat tables, round shapes and/or “shortformer” cylinders.
• Carrying out each of the steps of the process is not limited to a particular embodiment.
• the fibrous substrate can be produced in step c) by projection or suction of the suspension onto a moving canvas.
• any other method of production known to those skilled in the art can be considered.
• the aqueous suspension of fibers and fillers, the colloidal dispersion of at least one anionic polymer and the cationic precipitation agent are advantageously introduced in mass.
• the anionic polymer is precipitated on the surface of the fibers, in the presence of at least one cationic precipitating agent.
• This bringing together can be achieved by the simultaneous or sequential addition of the colloidal dispersion of at least one anionic polymer and at least one cationic precipitating agent.
• the cationic precipitating agent is added first to the aqueous suspension, then the dispersion of at least one anionic polymer is incorporated into the mixture in a second step.
• This embodiment particularly advantageous in combination with the use of cotton fibers, makes it possible to modify the electrostatic charge of the fibers to make them cationic and thus allow the fixation and precipitation of the anionic polymer particles on the fibers made cationic.
• the surfacing bath is applied by a sizing press to at least one of the faces of the fibrous substrate according to the invention.
• the manufacturing process according to the invention may include an additional step of coating or coating on one side, preferably on both sides, of the substrate.
• Coating or coating can be done by a air knife system, curtain coating, by a pencil, blade or doctor blade system, with rollers, in particular pre-dosed, engraved or transfer.
• the present invention also relates to the use of a fibrous substrate according to the invention to prepare a banknote or a security sheet.
• the banknote according to the invention has the same properties as the fibrous substrate according to the invention and measured according to the characterization methods defined above for the fibrous substrate.
• the banknote according to the invention has an internal cohesion Scott Bond, assessed according to the Tappi 569 om-09 standard, greater than 1000 J/m 2 , in particular greater than 1300 J/m 2 , or even greater than 1500 D/m 2 .
• the substrate has a porosity after crumpling which is at most equal to 80 mL/min, preferably at most equal to 50 mL/min, assessed according to standard ISO 5636-3. As shown in the implementation examples detailed below, such porosity advantageously allows less contamination of the substrate after crumpling thereof.
• the substrate according to the invention is a security sheet which integrates at least one security element allowing the authentication of said sheet.
• said security element is chosen from visual devices, in particular optically variable devices, called OVDs, holograms, lenticular devices, elements with an interference effect, in particular iridescent elements, liquid crystals, effect pigments. magnetically orientable and interference multilayer structures.
• optically variable devices can be present on security wires integrated into the fibrous substrate or, on strips or patches affixed or printed on the fibrous substrate.
• said security element is chosen from so-called luminescent elements, which can be revealed under UV or IR, these luminescent elements being able to be in the form particles, fibers, planks, security thread integrated at least partly in the fibrous substrate, strips or patches affixed or printed on the fibrous substrate.
• said security element is chosen from automatically detectable elements, in particular optically or magnetically, these detectable elements commonly called markers or taggants being integrated into the fibrous substrate or into visual or luminescent security elements.
• a security sheet according to the invention may also include a radio frequency identification device, called RFID, also providing an identification and traceability function to the security sheet.
• RFID radio frequency identification device
• the present invention also relates to a security document comprising a security sheet according to the invention.
• the security document according to the invention is an official document, in particular an identity document, a passport, a residence permit or a visa.
• Example 1 Preparation of a paper-type fibrous substrate according to the invention and of a substrate not in accordance with the invention.
• Each of the bases undergoes treatment in a size press among the following treatments:
• Treatment A without biocide:
• Treatment B (integrating a bacteriostatic agent and a fungicidal agent):
• the assimilable microbial load is defined as the number of Staphylococcus aureus bacteria present on the paper after inoculation by immersion of the inoculum for one minute, draining then extraction.
• the inoculum used is inoculum of Staphylococcus aureus ATCC 6538 at a concentration of 2.11.106 CFU/ml (Colony Forming Unit/ml).
• Bendtsen air permeability measurements (in cm 3 /min) also known as Bendtsen porosity are carried out according to the ISO 5636-3 standard.
• treatment B with an anionic polymer significantly perpetuates the biocidal properties at the substrate level.
• the variation in internal cohesion between treatment A and treatment B is also more limited for the base paper with anionic polymer.
• a paper is made from base 2 to which a treatment B' is applied.
• Treatment B' corresponding to treatment B in which didecyl chloride dimethyl ammonium is replaced by silver chloride.
• the quantities of silver chloride and 3-iodo-2-propynylbutyl carbamate in treatment B' are determined so as to obtain, in dry weight relative to the fibrous substrate, 0.0036% of silver chloride and 0 .15% of 3-iodo-2-propynylbutyl carbamate, i.e. a total of 0.1536% of biocide by dry weight relative to the fibrous substrate.

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• 2019
  • 2019-08-06 FR FR1909003A patent/FR3099768B1/fr active Active
• 2020
  • 2020-07-29 HU HUE20751497A patent/HUE066778T2/hu unknown
  • 2020-07-29 ES ES20751497T patent/ES2984126T3/es active Active
  • 2020-07-29 WO PCT/EP2020/071444 patent/WO2021023601A1/fr not_active Ceased
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