Porous media with biocidal properties

Abstract

The present invention relates to a biocidal composition for the surface treatment of a porous substrate, said composition comprising at least one hydrophilic binder, at least one biocidal compound based on a quaternary ammonium, and at least one cationic size. The present invention further relates to a method of using such a composition to impart biocidal properties, in particular antiviral properties, to a porous substrate.

Description

[Technical Field]

[0001] The present invention relates to media for porous media having biocidal properties, particularly in the field of sheet materials, and more particularly in the field of fibrous materials, such as paper, nonwoven materials and textiles, especially writing paper and printing paper; coated paper; copy paper; packaging cardboards made from virgin and / or recycled fibers; leather; wood; security paper; security documents; and media for banknotes.

[0002] A particular object of the present invention is to provide useful compositions and methods for imparting biocide activity to a surface and ensuring hydrophobicity in a porous substrate from which these media originate. [Background technology]

[0003] In modern society, the use of paper media intended for information transmission, particularly banknotes, as well as paper media intended for packaging, such as cardboard, continues to increase and is handled frequently by many people on a daily basis.

[0004] However, some of these individuals may harbor one or more pathogenic microorganisms, and therefore, the media handled by these individuals can become vectors of contamination and sources of epidemics and pandemics of varying severity. In this regard, it is also important to note that cellulose fiber materials, such as banknotes or cardboard, generally tend to absorb moisture, thereby clearly promoting the development of microorganisms within them and / or helping to maintain their survival.

[0005] The problem of microbial, bacterial, fungal, and / or viral contamination of fibrous materials, commonly known as cellulose, is not new, and solutions have already been developed to overcome the risk of microbial, bacterial, fungal, and / or viral infection associated with their handling in large quantities.

[0006] The most common solution involves treating the medium, more generally their base substrates formed from cellulose materials, with at least one biocide. The incorporation of one or more biocides into the base substrate can be achieved by immersing the substrate in a solution of the biocide, or by spraying, surface treating, or coating the substrate with a solution containing the biocide.

[0007] Examples of biocides conventionally used for these purposes include, in particular, p-[(diiodomethyl)sulfonyl]toluene, 3-iodo-2-propynyl butylcarbamate, methyl 1H-benzimidazole-2-ylcarbamate, monolaurin, compounds based on isothiazolin or isothiazolone derivatives, chitosan, quaternary ammonium salts, especially didecyldimethylammonium chloride, and silver-zinc zeolite. However, these biocides often possess only specific biocidal activities, namely bactericidal activity, fungicidal activity, or virucidal activity, and therefore, a combination of these is necessary to obtain a broad-spectrum biocidal effect. Of course, this is a further limitation, as the conditions under which these biocides are used are not always the same. In this regard, compounds based on quaternary ammonium, particularly didecyldimethylammonium chloride (DDAC), are known to be particularly advantageous biocides because they possess multiple biocidal properties, especially antibacterial, antifungal, and antiviral properties (European Patent EP2457440B).

[0008] Unfortunately, compounds based on quaternary ammonium also have the specific feature of being strong cationic compounds and tend to strongly hydrophilize the substrates into which they are incorporated. Thus, when DDAC is used with hydrophilic binders such as polyvinyl alcohol or starch and applied to cellulose substrates, the hydrophobicity of this substrate, which can be quantified by the Cobb water absorption test, decreases, for example, to the extent that the required standards of 20 - 40 g / m 2 for writing and printing papers or for wrapping papers cannot be achieved anymore. It should also be noted that cellulose media obtained from recycling have the special feature of being less hydrophobic than higher-grade cellulose media. Moreover, the cellulose media contain a large amount of residual starch-based products, which promote the development or survival of microorganisms. Thus, treatment with biocidal compounds based on quaternary ammonium, such as DDAC, exacerbates this problem and is sufficient to defeat the purpose of reducing the risk of contamination pursued by this compound, because moisture is favorable for the development of microorganisms.

Summary of the Invention

Problems to be Solved by the Invention

[0009] Therefore, there is still a need for surface treatments, particularly coatings, that enable the imparting of biocidal properties to porous substrates, particularly cellulose substrates, without changing their hydrophobicity.

[0010] Similarly, there is still a need for surface treatments, particularly coatings, that can simultaneously impart biocidal properties and significant hydrophobicity to fibrous substrates resulting from the recycling of higher-grade fibrous substrates.

[0011] The object of the present invention is in particular to provide biocidal protection that is economically acceptable for substrates intended for bulk packaging.

[0012] Another objective is to provide for the use of biocides included in the list of biocidal products approved for contact with foodstuffs.

[0013] A further objective is to ensure the maintenance of antibacterial activity.

[0014] The ultimate objective is to provide a solution that, in addition to the desired biocidal properties, is capable of providing satisfactory hydrophobicity, especially for bulk packaging or substrates intended for writing paper and printing.

Means for Solving the Problem

[0015] Therefore, the present invention proposes a novel biocidal composition for the surface treatment of substrates.

[0016] Therefore, according to one aspect thereof, the present invention is a biocidal composition for the surface treatment of a porous substrate, at least one hydrophilic binder, at least one biocidal compound based on quaternary ammonium, especially a quaternary ammonium salt, especially didecyldimethylammonium chloride (DDAC), and at least one cationic sizing agent relates to the above biocidal composition containing the same.

[0017] In particular, the biocidal composition contains at least one biocidal compound based on quaternary ammonium selected from polymeric or non-polymeric quaternary ammonium salts, especially at least one biocidal compound based on quaternary ammonium selected from non-polymeric quaternary ammonium salts, and more particularly contains at least didecyldimethylammonium chloride (DDAC).

[0018] More particularly, the present invention is a biocidal composition for the surface treatment of a porous substrate, at least one hydrophilic binder, the following formula: (CH3)2A2N + X -A biocide compound based on a quaternary ammonium, selected from nonpolymeric quaternary ammonium salts, where, A may be the same or different, and is a linear C6~C 20 Represents an alkyl group, and, X - This includes anions selected from halide anions and sulfonate anions, At least one cationic sizing agent, particularly one selected from alkenyl ketene dimers (AnKD), alkyl ketene dimers (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof. The present invention relates to the biocidal composition described above, including the above.

[0019] In particular, the biocide compound based on the quaternary ammonium contains at least didecyldimethylammonium chloride (DDAC).

[0020] For the purposes of the present invention, "surface treatment" means forming a deposit of the composition on the surface of a substrate, so that the medium thus obtained has desired surface biocidal properties and hydrophobicity. In particular, the surface treatment obtained according to the present invention results in the formation of a localized coating on the surface of the medium and / or in the surface portion of the thickness of the medium.

[0021] For the purposes of this invention, the terms “biocidal agent” or “biocidal” (they are equivalent to the terms “antimicrobial agent”) generally refer to any agent that is effective in regulating and / or inhibiting and / or reducing the density of microorganisms, such as viruses, fungi, bacteria and / or yeasts.

[0022] For the purposes of this invention, a "cationic sizing agent" refers to a sizing agent formulated in the form of a cationic emulsion, a cationic solution, or a cationic dispersion. In emulsion and dispersion formulations, the surface of the droplets or particles of the cationic sizing agent is positively charged. Cationic sizing agents can be characterized by positive zeta potential measurement. The zeta potential can be measured using an apparatus for measuring electrophoretic mobility. Cationic sizing agents can also be characterized by titration, in particular, with an anionic electrolyte, such as anionic polyacrylamide. The titration can be measured using a Mutek PCD apparatus.

[0023] As can be seen from the following examples, the inventors have found that, contrary to all expectations, by using a specific type of sizing agent in combination with a quaternary ammonium-based biocide compound, particularly DDAC, in surface treatment, it is possible to ensure significant hydrophobicity in porous substrates, particularly fibrous substrates treated in this manner, while maintaining the expected biocide properties of the quaternary ammonium-based biocide compound.

[0024] In another view, the present invention relates to a porous medium, in particular a fibrous medium, the porous medium having surface biocidal properties and having a surface treatment, preferably a coating, formed from a composition according to the present invention on at least one of its outer surfaces, in whole or in part. In particular, the porous medium is selected from paper and cardboard, in particular cardboard for packaging, in particular flat cardboards or corrugated cardboards, and is selected from paper and cardboard formed at least partially from recycled fibers, for example.

[0025] Furthermore, from another perspective, the present invention relates to a method for producing a porous medium having surface biocide properties in accordance with the present invention, a) To provide a porous substrate, particularly a fibrous substrate, preferably a porous substrate at least partially formed from regenerated fibers, b) Contacting at least one whole or part of the outer surface of the porous substrate with a composition according to the present invention under conditions that facilitate the formation of a deposit of the composition thereon. c) Dry the sediment to form a porous medium with biocidal properties. The objective is to use the above method which includes at least the following steps.

[0026] Furthermore, in another respect, the present invention provides a method of using the composition of the present invention to impart biocidal properties, particularly antiviral properties, to porous substrates, particularly fibrous substrates.

[0027] Furthermore, in another respect, the present invention provides a method of using compositions according to the present invention to enhance the hydrophobicity of porous substrates, in particular fibrous substrates, in particular substrates formed at least partially from regenerated fibers.

[0028] Furthermore, in another respect, the present invention provides a method of using a porous medium according to the present invention for the manufacture of banknotes or security sheets, or paper for printing, writing, or copying.

[0029] Furthermore, from another perspective, the present invention provides a method for using a porous medium according to the present invention to manufacture cardboard packaging.

[0030] In another view, the present invention provides a method for using a porous medium according to the present invention to manufacture paper, nonwoven materials, and textiles, writing paper and printing paper, coated paper, and copy paper. [Modes for carrying out the invention]

[0031] Composition according to the present invention

[0032] Biocidal compounds based on quaternary ammonium

[0033] Compounds based on quaternary ammonium, particularly quaternary ammonium salts, are known as antimicrobial agents and / or microbicidal agents, and more particularly as bacteriostatic agents (or bactericidal agents) and / or bactericidal agents and / or fungistatic agents (or antifungal agents) and / or fungicidal agents.

[0034] These are, more specifically, polymeric or non-polymeric quaternary ammonium salts.

[0035] Quaternary ammonium salts are generally suitable for anion X. - It comprises at least one quaternary ammonium cation having [a specific characteristic].

[0036] The cation is more particularly represented by the following formula. [ka] Here, R1, R2, R3, and R4 may be of different species. For example, R1, R2, R3, and R4 may be independently selected from alkyl groups, aryl groups, alkylaryl groups, arylalkyl groups, cycloalkyl groups, aromatic or non-aromatic heterocyclic groups, or alkenyl groups, where the group may be substituted or unsubstituted, linear or branched, and optionally interposed by one or more heteroatoms, such as one or more oxygen atoms, or one or more phosphinic acid groups.

[0037] Alternatively, two or more R1, R2, R3, and R4 groups may form substituted or unsubstituted heterocycles together with the nitrogen atom containing them.

[0038] According to a specific embodiment, the R1 group, the R2 group, the R3 group, and the R4 group are alkyl groups, preferably linear alkyl groups, particularly alkyl groups of C1 to C 20 and are alkyl groups of. Particularly, the R1 group, the R2 group, the R3 group, and the R4 group are saturated, preferably saturated, preferably linear, particularly C1 to C 20 , and are alkyl groups of.

[0039] The R1 group, the R2 group, the R3 group, and the R4 group together contain at least 4 carbon atoms. Particularly, the total number of carbon atoms in the R1 group, the R2 group, the R3 group, and the R4 group may be at least 10. Preferably, at least one of the R1 group, the R2 group, the R3 group, and the R4 group, particularly two of the R1 group, the R2 group, the R3 group, and the R4 group, contain 6 to 20 carbon atoms, particularly 8 to 18 carbon atoms.

[0040] The anion X of the quaternary ammonium salt - can particularly be selected from halide anions such as chloride, fluoride, bromide or iodide, and sulfonate anions. Particularly, the anion of the quaternary ammonium salt can be selected from halide anions. Preferably, the anion of the quaternary ammonium salt can be chloride.

[0041] The non-polymeric quaternary ammonium salt can more particularly be of the following formula. (CH3) n (A) m N + X - where A has the definitions proposed above for R1, R2, R3, and R4, X - is the anion defined above, n is an integer from 1 to 3, preferably 2 or 3, m is an integer from 1 to 3, preferably 1 or 2, provided that the sum of n + m is equal to 4. When m is 2 or 3, the A groups may be the same or different, particularly identical.

[0042] Preferably, the quaternary ammonium salt used as the antibacterial agent according to the present invention has the following formula: (CH3)n (A) m N + X - This may also be the case, where n is 2, m is 2, and A may be the same or different, as defined above for R1, R2, R3 and R4.

[0043] In particular, A may be the same or different, and may be identical, and a linear C6~C 20 , especially C8~C 18 , especially C8~C 12 , or alkyl group, may also be used.

[0044] In particular, A may be the same or different, and in particular may be identical, linear saturated C6~C 20 , especially C8~C 18 , especially C8~C 12 , or alkyl groups may also be used.

[0045] Examples include didecyldimethylammonium chloride (DDAC), dioctyldimethylammonium chloride, and octyldecyldimethylammonium chloride.

[0046] Biocidal compounds based on quaternary ammonium may also be polymeric quaternary ammonium salts, i.e., compounds having a chemical formula that repeatedly contains "quaternary ammonium" units.

[0047] Such “polymerizable” quaternary ammonium salts may be derived from at least one compound of formula (I) having at least one of R1, R2, R3, and R4 being a polymerizable function, particularly a functional group containing one or more ethylenically unsaturated groups, more particularly a functional group selected from (meth)acrylate and allyl functional groups.

[0048] In particular, this "polymeric" compound based on a quaternary ammonium may be obtained by polymerizing at least one of the aforementioned quaternary ammonium salts of formula (I), where two of R1, R2, R3, and R4 are groups having allyl functional groups, particularly allyl groups, and the other is preferably an alkyl group, particularly C1-C6, particularly C1-C4, and particularly methyl group.

[0049] According to certain embodiments, this polymeric compound based on quaternary ammonium is a homopolymer of diallyldialkylammonium chloride. In particular, it may be a polymer of diallyldimethylammonium chloride called polyDADMAC. polyDADMAC may be synthesized by free radical polymerization of DADMAC in the presence of a peroxide as a catalyst, or it may be commercially available.

[0050] According to a particular embodiment, the biocide composition according to the present invention comprises at least didecyldimethylammonium chloride (DDAC).

[0051] As described above, the biocide composition of the present invention comprises, by dry weight, 0.05% to 2.5%, preferably 0.25% to 1.5%, and more preferably 0.25% to 1%, of one or more quaternary ammonium-based biocide compounds, selected from polymeric or nonpolymeric quaternary ammonium salts, particularly selected from nonpolymeric quaternary ammonium salts, and more particularly selected from didecyldimethylammonium chloride (DDAC), based on the total weight of the composition.

[0052] For the purposes of this invention, "dry weight" is also referred to as "weight of the active ingredient," and unless otherwise specified, it indicates the weight content of the compound excluding any volatile solvents included in the formulation, such as water.

[0053] In particular, the amount of one or more biocide compounds based on quaternary ammonium, especially DDAC, in the composition is adjusted so that the surface treatment, preferably the coating formed from the composition, contains one or more biocide compounds based on quaternary ammonium, especially DDAC, in an amount of less than 10% by dry weight, preferably less than 5% by dry weight, relative to its total dry weight.

[0054] As can be seen from the following examples in this specification, the porous media obtained according to the present invention advantageously exhibit good to excellent antiviral activity according to the criteria of standard ISO 18184:2019-06, Annex 5, after 5 hours of contact between the human coronavirus strain HcoV-229E and HcoV-OC43 according to standard ISO 21702:2019 or ASTME 1093, and in particular exhibit very strong antiviral activity against enveloped virus family viruses, which showed a decrease in viral titer of 2.5- and 3-1-log.

[0055] Cationic sizing agents

[0056] As detailed below, the combination of such sizing agents with quaternary ammonium-based biocides, particularly quaternary ammonium salts, such as DDAC, makes it possible to significantly neutralize the negative effect of the quaternary ammonium-based compounds on the hydrophobicity of the porous substrate to be treated.

[0057] Hydrophobicity is characterized by resistance to water penetration and is therefore measured using the Cobb test (60 seconds). This test measures the amount of water absorbed into the medium over 60 seconds using a cylindrical impregnation template, in g / m³. 2 This is how it is represented. This test is a test that is conventionally used in the paper industry to characterize the absorbency of paper.

[0058] In particular, the cationic sizing agent may be selected from acrylonitrile, alkenyl ketene dimer (AnKD), alkyl ketene dimer (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof.

[0059] In particular, the cationic sizing agent may contain at least one compound, in particular at least one compound selected from acrylonitrile, alkenyl ketene dimer (AnKD), alkyl ketene dimer (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof.

[0060] More particularly, the cationic sizing agent comprises at least one alkyl ketene dimer (AKD) and / or one styrene acrylate (SAE), more preferably comprising at least one alkyl ketene dimer (AKD).

[0061] In particular, the cationic sizing agent comprises at least one styrene acrylate (SAE).

[0062] This is particularly true for cationic alkylketene dimer type surface sizing agents, such as Aquapel by Solenis. 商標 A surface sizing agent sold under the name J 215(AKD) may be used, or alternatively, a cationic styrene acrylate (SAE) type surface sizing agent, such as the type sold by Solenis under the name Basoplast 270D.

[0063] In particular, the cationic sizing agent is different from the quaternary ammonium-based biocide compounds used in compositions according to the present invention. Specifically, the cationic sizing agent is different from quaternary ammonium salts.

[0064] A composition according to the present invention may particularly contain 0.5% to 5% by weight, preferably 1% to 4% by weight, and more preferably 1% to 3% by weight of one or more commercially available cationic sizing agent products based on the total composition.

[0065] In particular, a biocide compound based on a quaternary ammonium, preferably didecyldimethylammonium chloride, and one or more cationic sizing agents may be used in a composition according to the present invention, such that the weight ratio of the dry weight of one or more quaternary ammonium-based compounds to the weight of one or more commercially available cationic sizing agent products is in the range of 0.1 to 0.5, preferably 0.25 to 0.375, and more preferably 0.25 to 0.33.

[0066] According to a particular embodiment, a composition according to the present invention may contain a cationic sizing agent in an amount of 0.08% to 1.5% by dry weight, preferably 0.17% to 1.2% by dry weight, and more preferably 0.17% to 0.9% by dry weight, based on the total weight of the composition.

[0067] According to a particular embodiment, a biocide compound based on a quaternary ammonium, preferably didecyldimethylammonium chloride, and one or more cationic sizing agents are used, wherein the weight ratio of the dry weight of the one or more quaternary ammonium-based compounds to the dry weight of the one or more cationic sizing agents is 0.25 to 5.9, particularly 0.3 to 3.6, preferably 0.8 to 2.5, and more preferably 0.8 to 2.2.

[0068] As can be seen from the following examples in this specification, the porous media obtained according to the present invention is advantageously 50 g / m², as measured in a Cobb test performed in accordance with standard ISO 535:2014 over 60 seconds. 2 Preferably 20-40 g / m 2 , has a Cobb value of .

[0069] Binder

[0070] A composition according to the present invention comprises a biocide compound based on a quaternary ammonium, particularly as defined above, particularly a quaternary ammonium salt, e.g., DDAC, and at least one cationic sizing agent, particularly as defined above, in addition to at least one hydrophilic binder. This binder is referred to as hydrophilic in consideration of its affinity for water, and therefore its affinity for aqueous media.

[0071] In particular, this binder may be selected from polyvinyl alcohol, starch, latex, especially acrylic latex or acrylic copolymer latex, hemicellulose, carboxymethylcellulose (CMC), galactomannan, gelatin, polyurethane dispersions, and combinations thereof.

[0072] More specifically, the binder comprises at least one polyvinyl alcohol and / or one starch, more preferably at least one starch.

[0073] This could be, for example, potato starch, particularly oxidized potato starch, wheat starch, or corn starch.

[0074] Accordingly, a composition according to the present invention may contain one or more hydrophilic binders in an amount of 1% to 50% by dry weight, preferably 2% to 40% by dry weight, and more preferably 2% to 20% by dry weight, based on the total weight of the composition.

[0075] In addition to these three essential compounds, compositions according to the present invention may also contain aqueous solvents, particularly water, and any other compounds conventionally considered for surface treatment of porous substrates, as well as the biocide activity desired according to the present invention.

[0076] Auxiliary biocidal agent

[0077] Accordingly, the composition according to the present invention contains one or more static compounds other than quaternary ammonium biocides. bacteriaBacteriostatic agent, killing bacteria Bactericidal agent, fungistatic agent, fungicidal agent, yeast killing It may contain a levuricidal agent or a virucidal agent.

[0078] These drugs are, of course, selected with consideration to being harmless to humans under the usage conditions of the present invention.

[0079] These one or more auxiliary biocides may be selected from, in particular, p-[(diiodomethyl)sulfonyl]toluene, 3-iodo-2-propynyl butylcarbamate, methyl-1H-benzimidazole-2-ylcarbamate, monolaurin, compounds based on isothiazolin or isothiazolone derivatives, compounds based on chitosan or chitin derivatives, compounds based on zinc zeolite, compounds based on silver ions, in particular compounds based on silver chloride, compounds based on silver in supported particle form, and compounds based on triclosan, as well as combinations thereof.

[0080] According to one modification, a composition according to the present invention comprises at least one fungiostatic and / or fungicidal agent selected from compounds based on chitosan or chitin derivatives, compounds based on zinc zeolite, compounds based on silver ions, compounds based on silver in supported particle form, and compounds based on triclosan, as well as combinations thereof.

[0081] According to one modification, a composition according to the present invention comprises at least one bactericide and / or fungicide selected from compounds based on isothiazolin or isothiazolone derivatives, compounds based on chitosan or chitin derivatives, compounds based on zinc zeolite, compounds based on silver ions, compounds based on silver in supported particulate form, and compounds based on triclosan.

[0082] According to one variation, a composition according to the present invention comprises at least one fungiostatic and / or fungicidal agent based on p-[(diiodomethyl)sulfonyl]toluene.

[0083] According to one variation, a composition according to the present invention comprises at least one fungiostatic and / or fungicidal agent based on methyl-1H-benzimidazole-2-ylcarbamate.

[0084] According to one preferred modification, the composition according to the present invention comprises at least 3-iodo-2-propynyl butylcarbamidic acid (IPBC).

[0085] In other variations, compositions according to the present invention include at least one virucide, particularly a naturally derived virucide.

[0086] For the purposes of this invention, the term "virucide" means a compound having the ability to kill or inhibit viruses.

[0087] The virucidal agents according to the present invention are more particularly intended to kill and / or inhibit viruses that are pathogenic to mammals, and more particularly to humans.

[0088] Such viruses can be either non-enveloped viruses or enveloped viruses.

[0089] Examples of viruses that are pathogenic to humans and can be considered in accordance with the present invention include, more particularly, retroviruses, cytomegaloviruses, rotaviruses, paramyxoviruses, polioviruses, hantaviruses, coxsackieviruses, encephalomyocarditis virus, picornaviruses, picornaviruses including, for example, rhinoviruses, DNA or RNA viruses, particularly flaviviridae, HIV, influenza viruses, particularly H1N1, coronaviruses, particularly human coronaviruses Hcov-229E, Hcov-0C43, SARS-CoV-2, smallpox virus, yellow fever virus, and hepatitis C virus. This includes C virus, Ebola viruses, herpes viruses, Epstein-Barr virus, varicella zoster virus, rubella virus, and Simian virus 40, or SV40.

[0090] "Naturally derived virucidal agents" refer to any virucidal agent that already exists in nature, or any virucidal agent that can be synthesized from naturally occurring compounds that exist in nature.

[0091] Therefore, naturally derived vircidizing agents that can be used in the context of the present invention can be obtained by extraction and purification from natural media containing them, or by synthesis from natural compounds.

[0092] Examples of such antiviral agents include monolaurin, which can be obtained by synthesis from glycerol and lauric acid.

[0093] For the purposes of this invention, the term "monolaurin" refers to both naturally occurring monolaurin and monolaurin obtained by synthesis from glycerol and lauric acid.

[0094] According to one embodiment, naturally derived virucidal agents may be selected from monolaurin, lactoferrin, and essential oils having antiviral activity, such as laurel essential oil.

[0095] For example, the composition of the present invention may contain one or more naturally derived virucidal agents in an amount of 0.1% to 2.0% by dry weight, for example, 0.5% to 1.5% by dry weight, relative to the total dry weight of the composition.

[0096] In a preferred embodiment, the auxiliary bioside is at least monolaurin.

[0097] According to another specific embodiment, a composition according to the present invention comprises at least one filler, particularly a mineral filler.

[0098] Such components are particularly advantageous for providing enhanced surface quality on surface treatments formed by compositions according to the present invention, and especially for improving the coefficient of friction.

[0099] The filler is selected from mineral fillers, particularly colloidal silica, sodium silicate, sodium aluminosilicate, natural or precipitated calcium carbonate, talc, natural or calcined kaolin, alumina hydrate, titanium dioxide, aluminum silicate, barium sulfate, and combinations thereof, as well as organic fillers, particularly plastic fillers or pigments. Preferably, a composition according to the present invention comprises at least one mineral filler, particularly calcium carbonate.

[0100] Accordingly, a composition according to the present invention may contain 0.1% to 5% by weight, preferably 0.1% to 1% by weight, of a filler, particularly a mineral filler, based on the total weight of the composition.

[0101] Porous medium and method for producing the same according to the present invention

[0102] porous media

[0103] As can be seen from the above, the present invention also provides a porous medium in which all or part of its outer surface is treated with the composition of the present invention, in particular to form a coating thereon.

[0104] The porous medium may be advantageously fibrous, particularly paper or cardboard, especially cardboard intended to form packaging cardboard, where the cardboard is made of virgin fibers, or preferably at least partially or entirely made of recycled fibers.

[0105] A fibrous substrate suitable for producing this medium is, in particular, formed from natural, artificial, and / or synthetic fibers. The fibrous substrate may also contain mineral fillers.

[0106] According to one embodiment of the present invention, the fibers used in the composition of the base material include natural fibers.

[0107] Natural fibers include cellulose fibers, such as wood fibers, such as hardwood fibers, softwood fibers, or combinations thereof; cotton fibers, bamboo fibers, straw fibers, abaca fibers, esparto fibers, hemp fibers, jute fibers, flax fibers, sisal fibers, and combinations thereof.

[0108] Paper pulp used to form paper or cardboard may be bleached, semi-bleached, or unbleached, and can generally be referred to as bleached fiber, semi-bleached fiber, and non-bleached fiber, respectively.

[0109] Preferably, the fibers used in the composition of the base material include cellulose fibers, particularly cotton fibers.

[0110] In particular, the cellulose fiber is a mixture of cotton fiber and wood fiber.

[0111] According to a favorable modification, the substrate is formed at least partially, or mostly, of recycled fibers, such as fibers derived from the tritiation of waste paper.

[0112] According to another embodiment of the present invention, the fibers used in the composition of the substrate may include synthetic fibers. The presence of synthetic fibers blended with cellulose fibers in the substrate according to the present invention makes it possible to improve the tear resistance of the substrate.

[0113] In addition to these fibers, the substrate may also include porous, and more particularly fibrous, substrates, as well as other components commonly used in the paper or cardboard industry, especially humectants, such as polyol-type compounds, such as glycerol (also called glycerin), propylene glycol, polyethylene glycol, butylene glycol, glyceryl triacetate, or sorbitol; fillers, especially those defined above; and anionic or cationic bulk sizing agents, such as those intended to give some hydrophobicity to the finished substrate.

[0114] In a preferred embodiment, the porous medium obtained according to the present invention is a fibrous paper or cardboard medium for banknotes or security documents, or a card support for the manufacture of packaging paper or copy paper, or packaging cardboard, particularly cardboard intended to form flat cardboards or corrugated cardboards. The porous medium may also be a leather or wood surface treated according to the present invention.

[0115] Method for manufacturing a porous medium

[0116] In a method according to the present invention, at least one of the outer surfaces of a porous substrate in question is brought into contact with the composition according to the present invention under conditions that facilitate the formation of a deposit of the composition thereon, and the deposit thus obtained is dried to form an expected porous medium.

[0117] The drying process may be carried out at a temperature of 80°C or higher, for example, 90°C or higher, preferably 100°C or higher.

[0118] This contact process may be carried out according to various modifications.

[0119] The formation of the deposits may be carried out according to different application methods of the composition.

[0120] According to one embodiment, the fibrous substrate is immersed in a solution containing at least a composition according to the present invention.

[0121] According to another embodiment, a solution comprising at least a composition according to the present invention is sprayed onto at least one side surface of the substrate.

[0122] According to another embodiment, at least one of the outer surfaces of the substrate is coated with a coating solution containing at least one composition according to the present invention. The coating may be performed by an air knife system, a curtain coater, a pencil, a knife, or a doctor blade system, a roller, particularly a predosed roller, an engraved roller, or a transfer roller, a size press, an impregnator, or a film press.

[0123] According to another embodiment, at least one of the outer surfaces of the substrate is surface-treated with a surface treatment bath containing at least one composition according to the present invention.

[0124] According to another embodiment, the porous substrate is pre-coated and / or surface-treated, and then partially or entirely printed on its surface using an ink containing at least one composition according to the present invention.

[0125] According to another embodiment, an overprint varnish comprising at least one composition according to the present invention is preferably applied to at least one of the outer surfaces of the porous substrate after it has undergone pre-coating and / or surface treatment and printing. This can be applied by flexographic printing, gravure printing or spraying.

[0126] These embodiments are particularly advantageous insofar as their implementation is compatible with conventional methods for producing porous media, especially fibrous media, especially paper-type porous media, that is, insofar as they are compatible simultaneously with conventional manufacturing processes.

[0127] Therefore, advantageously, it does not require any additional processes other than those necessary for the manufacture of the medium.

[0128] These different methods of bringing the composition into contact with one or more outer surfaces of the substrate to be treated can, of course, be combined where appropriate. However, such combinations must be suitable for a substrate exhibiting the desired biocide activity and hydrophobicity.

[0129] application

[0130] The present invention relates to a method of using a porous medium, particularly a fibrous medium according to the present invention, for manufacturing paper for corrugated material used in the construction of covers (kraftliners or testliners) and / or packaging cardboard.

[0131] The present invention also relates to the use of a porous medium according to the present invention for manufacturing banknotes or security documents.

[0132] Banknotes, security documents, or cardboard packaging according to the present invention have the same properties as the porous media according to the present invention and are measured according to the characterization method defined for this fibrous media.

[0133] The present invention also relates to a method of using a porous medium according to the present invention for manufacturing paper, nonwoven materials and textiles, writing paper and printing paper, coated paper and copy paper.

[0134] According to one embodiment, a porous medium according to the present invention is intended to form a security sheet incorporating at least one security element that enables authentication of the sheet. In particular, the security element is selected from visual devices, in particular optical variable devices (referred to as OVDs), holograms, lenticular devices, elements having an interference effect, in particular iridescent elements, liquid crystals, pigments having a magnetically oriented effect, and multilayer interference structures. These optical variable devices may be present on security threads incorporated within a fibrous substrate, or on strips or patches attached to or printed on a fibrous substrate. Other visual security elements include watermarks created during the manufacturing process of the fibrous substrate. In particular, the security element is selected from what are known as luminescent elements; these luminescent elements can be revealed under UV or IR and may be in the form of security particles, security fiberlets, security planchets or security threads incorporated into at least a portion of a fibrous substrate, or strips or patches affixed or printed on a fibrous substrate. In particular, the security element is selected from elements that can be detected in an automated manner, particularly optically or magnetically, where these detectable elements are generally called markers or tagants and are incorporated into the fibrous medium or into the visual or luminescent security element. The security sheet may also include a radio frequency identification device (RFID), which also provides the security sheet with identification and traceability functions.

[0135] According to one embodiment, the security sheet considered in accordance with the present invention is a security document or forms part thereof. Preferably, the security document considered in accordance with the present invention is an official document, in particular an ID document, passport, residence permit or visa.

[0136] In another embodiment, the porous medium according to the present invention may be used to form driver's licenses, access cards, loyalty cards, photocopy cards, canteen cards, playing cards, collector's cards, means of payment, especially payment cards, banknotes, vouchers or receipts, tickets for cultural or sporting events, certificates of authenticity, books or magazines.

[0137] The following non-limiting embodiments will provide a better understanding of how the present invention can be implemented and its advantages.

[0138] Examples

[0139] Materials and methods

[0140] The following ingredients were used: A carboxylated potato starch bath with an 8% or 10% Al content, sold by Avebe under the name Perfectamyl P 255SH; Wheat starch; Corn starch; A cationic styrene acrylate type bulk sizing agent with an active ingredient content of 26.5%, sold by Kemira under the name Fennosize KD 860D; A cationic styrene acrylate (SAE) type surface sizing agent with a 30% active ingredient content, marketed by Solenis under the name Basoplast 270D; Aquapel by Solenis 商標 A cationic alkyl ketene dimer type surface sizing agent, marketed under the name J 215(AKD), containing 15% of the active ingredient AKD; Didecyldimethylammonium chloride (DDAC), sold by Thor, Stepan Europe, and Lonza as a solution containing 50% of the active ingredient DDAC; A solution of 3-iodo-2-propynyl butylcarbamate (IPBC) containing 20% ​​of the active ingredient IPBC, sold by Thor; Calcium carbonate sold by Omya under the name Hydrocarb 90 OG.

[0141] In the following examples, weight percent is expressed as the weight basis of a commercially available product that is the source of the compound according to the present invention, unless otherwise specified.

[0142] 1. Tests to evaluate hydrophobicity

[0143] A 60-second Cobb test, conducted in accordance with ISO 535:2014, allows for the characterization of water absorption by a sample.

[0144] 2. Tests to evaluate wet recovery

[0145] The purpose of this test is to measure the weight of the bath incorporated during coating / surface treatment by weighing the paper before and after coating / surface treatment without drying. Unit area (m²) 2 This is expressed as the amount of wet coating applied per unit area, either in grams or by weight percentage.

[0146] 3. Testing of antifungal properties

[0147] These are characterized by a 14-day contact time with a fungiostatic agent control, in accordance with the AATCC-30 Test 3 textile standard using Aspergillus niger van Thiegem (DSM 1957), and the AFNOR standard NFX41517, using a mixture of 10 strains.

[0148] 4. Testing of antiviral properties

[0149] All tests conducted using the coronavirus strain HcoV-229E were carried out in accordance with the standard ISO 21702:2019, with a contact time of 5 hours.

[0150] All tests conducted using coronavirus strain OC43 (ATCC VR-1558) were performed according to standard ASTM E1053, with a contact time of 5 hours.

[0151] All tests performed using bacteriophage MS2 were conducted in accordance with the standard ISO 18184:2019-06, with an exposure time of 18 hours.

[0152] The results are expressed logarithmically and correspond to the reduction in viral load for each contact time relative to the baseline without antimicrobial treatment.

[0153] 5. Measurement of the coefficient of friction

[0154] The coefficient of friction is determined according to NF Q03-082 of March 1984.

[0155] Example 1: Manufacture of biocidal compositions of the present invention and non-inventives.

[0156] The starch bath was prepared by cooking a carboxylated potato starch-type aqueous starch composition (Perfectamyl P 255SH) at 90°C for 20 minutes.

[0157] Compositions 1 and 2 of the present invention are produced from starch by mixing individual surface sizing agents in a starch bath. Once a homogeneous mixture is obtained, DDAC and, optionally, IBPC are added to the bath.

[0158] Control compositions 3 to 5 were prepared in the same manner.

[0159] The ratios used are shown in Table 1 below.

[0160] [Table 1]

[0161] Example 2: Production of the porous medium of the present invention and a porous medium not of the present invention by processing a substrate based on recycled pulp.

[0162] The porous substrate is manufactured from recycled pulp consisting of 100% recycled cardboard fibers, according to conventional papermaking methods with or without the cationic styrene acrylate type bulk sizing agent Fennosize KD 860D, the content of which is shown in Table 2 below as the weight % of the commercially available product relative to the dry weight of the recycled pulp. The substrate is 160 g / m² 2 It has a weighing capacity.

[0163] The obtained substrates were surface-treated with size presses of various compositions, as detailed in Example 1.

[0164] [Table 2]

[0165] As can be seen from these results detailed below, the compositions of the present invention, for example, the compositions in Test A and Test B, make it possible to obtain a favorable trade-off between the hydrophobic properties of paper and biocide activity.

[0166] Therefore, comparing control test C and control test D, the Cobb value is 30 g / m² when DDAC is present in the composition used to surface-treat fibrous substrates. 2 ~186g / m 2 It was found to increase rapidly, and therefore, this indicates hydrophilization of fibrous substrates by DDAC.

[0167] However, comparing Test A with the control Test D, it was found that using Composition 1 of the present invention significantly reduced the Cobb value, and therefore improved the hydrophobicity of the recycled paper. This same favorable result was also verified in Test B.

[0168] Furthermore, the two culture media obtained according to Test A and Test B were representative of the enveloped virus HcoV-229 E It showed very strong antiviral activity against [the target substance], with a value of 2.5 log.

[0169] Finally, a comparison of the culture media obtained according to Test A and Test B demonstrated an improvement in antifungal activity when IPBC was added to composition A.

[0170] Example 3: Production of the porous medium of the present invention and a porous medium not of the present invention from a substrate based on recycled pulp.

[0171] The fibrous base material is a high-grade pulp consisting of 80% bleached coniferous fiber and 20% eucalyptus kraft pulp, which is manufactured by adding or not adding cationic styrene acrylate type bulk sizing agent Fennosize KD 860D to the high-grade pulp, the content of which is shown in Table 3 as a weight % of the commercially available product relative to the dry weight of the recycled pulp. The base material thus obtained was surface-treated using one of the compositions detailed in Table 3 below, according to the process described in Example 2.

[0172] [Table 3]

[0173] By comparing Tests F and G according to the present invention with control Test H, it has been shown that substrates treated with Composition 1 and Composition 2 of the present invention have the same Cobb value as untreated substrates, regardless of the presence of DDAC. Therefore, the combination of a surface sizing agent, such as cationic styrene acrylate, and DDAC makes it possible to restore the hydrophobicity of fibrous substrates that do not contain DDAC.

[0174] By comparing tests according to the present invention with control tests, the improvement in antifungal activity obtained by surface-treating fibrous substrates with the composition of the present invention is also demonstrated in accordance with both AATCC30 and NFX41517 standards. It should also be noted that this antifungal activity is further improved by the presence of IPBC in the composition according to the present invention, as demonstrated by test G.

[0175] Example 4: Manufacture of the biocidal composition of the present invention and a non-inventive biocidal composition

[0176] Compositions 6 to 10 were prepared using cooked wheat starch according to the protocol already defined in Example 1, and Table 4 shows the proportions of their various components.

[0177] In the case of composition 10 of the present invention, CaCO3 was first incorporated into the starch bath before other compounds were added, and stirring was extended until it was dispersed.

[0178] Each of the compositions is based on non-recycled pulp and has a density of 160 g / m². 2The coating is applied to one side of a fibrous paper substrate having a certain weight and bulk sizing. Such substrates are conventionally used for packaging cardboard. The surface treatment is carried out according to the pencil application process. Each coating is analyzed for its hydrophobic properties as described above, and the measured values ​​are shown in Table 4 below.

[0179] [Table 4]

[0180] These results confirmed the effect of the presence of DDAC, which opposes hydrophobicity (control J vs. control I), and the effectiveness of cationic sizing agents in restoring this hydrophobicity (tests K-M vs. control test).

[0181] Antiviral activity was measured in Test M using coronavirus OC43 strain according to the method described in the section on materials and methods above. The resulting reduction in viral load was 3.1-log compared to a standard fibrous substrate without antimicrobial treatment. Therefore, the composition according to the present invention was found to provide effective antiviral protection to fibrous substrates.

[0182] Test M also revealed that the medium treated with composition 10, which also contains calcium carbonate, has a favorably improved coefficient of friction compared to the coefficient of friction observed in Test K.

[0183] Example 5: Manufacture of the biocide composition of the present invention

[0184] First, an aqueous starch bath was prepared from 11.4% by weight of cooked corn starch, and the whole was heated to 65°C until a homogeneous mixture was obtained.

[0185] Composition 11, comprising 96.5% by weight cooked corn starch in this bath, 3.9% by weight surface sizing agent Aquapel J 215 with a 15% by weight AI content, and 0.5% by weight DDAC solution with a 50% by weight DDAC content, was prepared according to a protocol similar to that described in Example 1.

[0186] This composition 11 is 190 g / m² 2 It was deposited on recycled pulp paper by surface treatment with a size press. The dry deposition amount was 9.5 g / m². 2 That was the case.

[0187] The Cobb value obtained according to the method detailed in the section on materials and methods above was 49.2 g / m². 2 The reduction in viral load by the coronavirus HCoV-229E strain was 1.6-log compared to a standard fibrous substrate without antimicrobial treatment.

[0188] The expected antiviral and hydrophobic properties were indeed observed.

[0189] Example 6: Manufacture of the biocide composition of the present invention

[0190] A composition 12 is prepared comprising 96% by weight of commercially available Mowiol 10-98 having a polyvinyl alcohol content of 7.8% by weight, 2% by weight of a DDAC solution having a DDAC content of 80% by weight, 1.5% by weight of Basoplast 270D surface sizing agent having an AI content of 30% by weight, and 0.5% by weight of commercially available Fennostrength XO (PAE resin).

[0191] The composition 12 thus formed is then used to produce 115 g / m² of unbleached kraft pulp. 2 It was deposited on the paper by surface treatment with a size press. The dry deposition amount was 1.8 g / m². 2 That was the case.

[0192] The Cobb value measured according to the method detailed in the section on materials and methods above was 42 g / m². 2 The viral load, as evaluated using the coronavirus OC43 strain according to the method described above, was 3-log or greater compared to a standard fibrous substrate without antimicrobial treatment.

[0193] The expected antiviral protection and hydrophobicity were indeed observed. In one embodiment, the present invention may be configured as follows. [Section 1] A biocide composition for surface treatment of porous substrates, At least one hydrophilic binder, The following formula: (CH3)2A2N + X - A biocide compound based on a quaternary ammonium, selected from nonpolymeric quaternary ammonium salts, where, A may be the same or different, and is a linear C6~C 20 Represents an alkyl group, and, X - is an anion selected from halide anions and sulfonate anions, and At least one cationic sizing agent, particularly one selected from alkenyl ketene dimers (AnKD), alkyl ketene dimers (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof. The biocidal composition comprising the above. [Section 2] The composition according to item 1, comprising at least didecyldimethylammonium chloride (DDAC), dioctyldimethylammonium chloride, or octyldecyldimethylammonium chloride, and preferably comprising at least didecyldimethylammonium chloride (DDAC). [Section 3] The composition according to claim 1 or 2, wherein the composition comprises at least one cationic sizing agent, the at least one cationic sizing agent comprising at least one compound selected from acrylonitrile, alkenyl ketene dimer (AnKD), alkyl ketene dimer (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof, preferably comprising at least one alkyl ketene dimer (AKD) and / or one styrene acrylate (SAE), and more preferably comprising at least one alkyl ketene dimer (AKD). [Section 4] The composition according to any one of claims 1 to 3, wherein the cationic sizing agent comprises at least one styrene acrylate (SAE). [Section 5] The composition according to any one of claims 1 to 4, wherein the composition comprises at least one hydrophilic binder, the hydrophilic binder being selected from polyvinyl alcohol, starch, latex, particularly acrylic latex or acrylic copolymer latex, hemicellulose, carboxymethylcellulose (CMC), galactomannan, gelatin, polyurethane dispersion, and combinations thereof, preferably comprising at least one polyvinyl alcohol and / or one starch, more preferably comprising at least one starch. [Section 6] The composition according to any one of claims 1 to 5, comprising one or more hydrophilic binders in an amount of 1% to 50% by dry weight, preferably 2% to 40% by dry weight, and more preferably 2% to 20% by dry weight, based on the total weight of the composition. [Section 7] A composition according to any one of claims 1 to 6, comprising one or more biocide compounds based on quaternary ammonium, particularly didecyldimethylammonium chloride, in an amount of 0.05% to 2.5% by dry weight, preferably 0.25% to 1.5% by dry weight, and more preferably 0.25% to 1% by dry weight, based on the total weight of the composition. [Section 8] A composition according to any one of claims 1 to 7, comprising one or more cationic sizing agents in an amount of 0.08% to 1.5% by dry weight, preferably 0.17% to 1.2% by dry weight, and more preferably 0.17% to 0.9% by dry weight, based on the total weight of the composition. [Section 9] The composition according to any one of claims 1 to 8, further comprising at least one mineral filler, particularly at least one selected from colloidal silica, sodium silicate, sodium aluminosilicate, natural or precipitated calcium carbonate, talc, natural or calcined kaolin, alumina hydrate, titanium dioxide, aluminum silicate, barium sulfate, and combinations thereof, preferably comprising at least calcium carbonate. [Section 10] A composition according to any one of claims 1 to 9, comprising one or more fillers, particularly one or more mineral fillers, in an amount of 0.1% to 5% by weight, preferably 0.1% to 1% by weight, based on the total weight of the composition. [Section 11] A composition according to any one of claims 1 to 10, further comprising one or more bacteriostatic agents, one or more bactericidal agents, one or more fungicidal agents, one or more fungicidal agents, one or more virucidal agents, other than biocidal compounds based on quaternary ammonium, preferably selected from p-[(diiodomethyl)sulfonyl]toluene, 3-iodo-2-propynyl butylcarbamate, methyl 1H-benzimidazole-2-ylcarbamate, monolaurin, compounds based on isothiazolin or isothiazolone derivatives, compounds based on chitosan or chitin derivatives, compounds based on zinc zeolite, compounds based on silver ions, particularly compounds based on silver chloride, compounds based on silver in supported particulate form, and compounds based on triclosan, and combinations thereof, more preferably comprising at least 3-iodo-2-propynylbutylcarbamic acid (IPBC). [Section 12] The composition described in item 11, including water. [Section 13] A porous medium, particularly a fibrous medium, having surface biocidal properties, and having a surface treatment, preferably a coating formed from any one of the compositions described in items 1 to 12, on at least one of its outer surfaces, in whole or in part. [Section 14] 50 g / m² measured over 60 seconds in a Cobb test conducted according to standard ISO 535:2014. 2 Preferably 20-40 g / m 2 A porous medium according to item 13, having a Cobb value of . [Section 15] The porous medium is fibrous, particularly paper or cardboard, particularly cardboard intended to form packaging cardboard, wherein the cardboard is made of virgin fibers, or preferably at least partially or entirely made of recycled fibers. A porous medium as described in item 13 or 14. [Section 16] A method for producing a porous medium having surface biocide properties as described in any one of items 13 to 15, a) To provide a porous substrate, particularly a fibrous substrate, preferably a porous substrate at least partially formed from regenerated fibers, b) Contacting at least one of the outer surfaces of the porous substrate with the composition described in any one of items 1 to 12 under conditions that facilitate the formation of a deposit of the composition thereon, c) Drying the sediment to form a porous medium with biocidal properties. The method comprising at least the step of: [Section 17] A method of using any of the compositions described in items 1 to 12 to impart biocidal properties, particularly antiviral properties, to a porous substrate, especially a fibrous substrate. [Section 18] A method for using any of the compositions described in items 1 to 12 to increase the hydrophobicity of a porous substrate, particularly a fibrous substrate. [Section 19] A method of using a porous medium as described in any one of paragraphs 13 to 15 to manufacture banknotes or security sheets, or paper for printing, writing or copying. [Section 20] A method for manufacturing cardboard for packaging using a porous medium as described in any one of sections 13 to 15. [Section 21] A method for using a porous medium described in any one of items 13 to 15 to manufacture paper, nonwoven materials, and textiles, writing paper and printing paper, coated paper, and copy paper.

Claims

1. A biocide composition for surface treatment of porous substrates, At least one hydrophilic binder, The following formula: (CH 3 ) 2 A 2 N + X - A biocide compound based on a quaternary ammonium, selected from nonpolymeric quaternary ammonium salts, where, A may be the same or different, and C is a linear chain. 6 ~C 20 Represents an alkyl group, and, X - is an anion selected from halide anions and sulfonate anions, and at least one cationic sizing agent The biocidal composition comprising the above.

2. The biocide composition according to claim 1, wherein the cationic sizing agent is selected from alkenyl ketene dimer (AnKD), alkyl ketene dimer (AKD), styrene acrylate (SAE), rosin, alkenyl succinic anhydride (ASA), and combinations thereof.

3. The composition according to claim 1, comprising at least didecyldimethylammonium chloride (DDAC), dioctyldimethylammonium chloride, or octyldecyldimethylammonium chloride.

4. The composition according to claim 1, wherein the at least one cationic sizing agent comprises at least one alkyl ketene dimer (AKD) and / or at least one styrene acrylate (SAE).

5. The composition according to claim 1, wherein the at least one hydrophilic binder is selected from polyvinyl alcohol, starch, latex, hemicellulose, carboxymethylcellulose (CMC), galactomannan, gelatin, polyurethane dispersions, and combinations thereof.

6. The composition according to claim 1, comprising one or more hydrophilic binders in an amount of 1% to 50% by dry weight relative to the total weight of the composition.

7. The composition according to claim 1, comprising 0.05% to 2.5% by dry weight of one or more biocide compounds based on quaternary ammonium, relative to the total weight of the composition.

8. The composition according to claim 1, comprising 0.08% to 1.5% by dry weight of one or more cationic sizing agents based on the total weight of the composition.

9. The composition according to claim 1, wherein the composition further comprises at least one mineral filler.

10. The composition according to claim 1, comprising 1 or more fillers in an amount of 0.1% to 5% by weight relative to the total weight of the composition.

11. The composition according to claim 1, further comprising one or more bacteriostatic agents, one or more bactericidal agents, one or more fungiostatic agents, one or more fungicidal agents, one or more yeasticidal agents, or one or more virucidal agents, other than a quaternary ammonium-based biocide.

12. The composition according to claim 1, comprising water.

13. A porous medium having surface biocidal properties, and having a surface treatment formed from the composition described in any one of claims 1 to 12 on at least one of its outer surfaces, in whole or in part.

14. Measured in 60 seconds in the Cobb test carried out in accordance with standard ISO 535:2014, 50 g / m 2 The porous medium according to claim 13, having the following Cobb value.

15. The porous medium according to claim 13, wherein the porous medium is fibrous.

16. A method for producing a porous medium having surface biocide properties according to claim 13, a) To provide a porous substrate, b) Contacting at least one whole or part of the outer surface of the porous substrate with the composition according to any one of claims 1 to 12 under conditions that facilitate the formation of a deposit of the composition thereon, c) Drying the sediment to form a porous medium with biocidal properties. The method comprising at least the step of:

17. A method of using the composition described in any one of claims 1 to 12 in order to impart biocidal properties to a porous substrate or to enhance the hydrophobicity of a porous substrate.

18. A method of using the porous medium described in claim 13 for manufacturing banknotes or security sheets or paper for printing, writing or copying, or for manufacturing cardboard for packaging, or for manufacturing paper, nonwoven materials or textiles, writing paper or printing paper, coated paper or copy paper.

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