Wiping sheet

Abstract

The wiping sheet according to the present invention comprises a non-woven fabric and an aqueous cleaning solution impregnated in the non-woven fabric, wherein the aqueous cleaning solution contains an aromatic antibacterial agent and a nonionic surfactant. It is preferable that the nonionic surfactant is a polyoxyalkylene alkyl ether. It is preferable that the number of ethylene oxides in the polyoxyethylene alkyl ether is 20 or more. The nonionic surfactant preferably contains the polyoxyethylene alkyl ether having 20 or more ethylene oxides and the polyoxyethylene alkyl ether having less than 12 ethylene oxides.

Description

Technical Field

[0001] The invention relates to a wet wiping sheet. Background Art

[0002] So-called wet sheets (cleaning sheets) made by impregnating nonwoven fabric with an aqueous solution containing a disinfectant, etc. are simple and easy to use. They can be used once, so clean sheets can be used all the time. Therefore, they are not only used in households, but also in environmental management in food factories, kitchens, and medical facilities.

[0003] In order to make the wiped object in a sanitary state, an antibacterial agent or a bactericide is often added to the aqueous cleaning liquid contained in the wet sheet. For example, Patent Document 1 describes a sterilization sheet in which an aqueous sterilizing agent is impregnated in a base sheet. The aqueous sterilizing agent contained in the sterilization sheet contains a quaternary ammonium salt surfactant, an inorganic electrolyte and / or a citrate, an alkali agent, and water.

[0004] Patent Document 2 describes that a quaternary ammonium salt-type surfactant, potassium hydroxide, an aminocarboxylic acid-type chelating agent, and water are blended into an aqueous disinfectant contained in a disinfection sheet.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-027916

[0008] Patent Document 2: Japanese Patent Application Publication No. 2019-112342 Summary of the invention

[0009] The present invention relates to a wiping sheet comprising a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric.

[0010] In one embodiment, the aqueous cleaning solution preferably contains an aromatic antimicrobial agent and a nonionic surfactant. DETAILED DESCRIPTION

[0011] When a wet sheet is used to wipe a large surface to be wiped, a sufficient amount of aqueous cleaning liquid is supplied at the beginning of wiping, so that a sufficient hygienic effect can be given to the surface to be wiped. However, as the wiping area increases, the hygienic effect given to the surface to be wiped tends to gradually decrease. This tendency also applies to the technologies described in the above-mentioned Patent Documents 1 and 2.

[0012] Therefore, the present invention relates to a wiping sheet which can maintain the hygienic performance of the wiped surface at the same level as that at the initial stage of wiping even when the wiping area is increased and the amount of released cleaning liquid is reduced.

[0013] Hereinafter, the present invention will be described based on preferred embodiments of the present invention.

[0014] In the present invention, "wiping" includes both cleaning and wiping, for example, including: cleaning of floors, walls, ceilings and columns, cleaning of building equipment or spare parts, wiping of objects, wiping of the body and body-related equipment, etc.

[0015] In addition, hereinafter, the aqueous cleaning liquid may be simply referred to as "cleaning liquid".

[0016] The present invention relates to a wiping sheet material, which comprises a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric. The inventors have conducted a thorough study on the composition of an aqueous cleaning liquid that can maintain its hygienic properties after wiping a large area, and surprisingly found that when the aqueous cleaning liquid contains an aromatic antibacterial agent and a nonionic surfactant, the virus removal effect of the wiping sheet material after wiping a large area can be excellently and effectively improved.

[0017] Aromatic antimicrobial agents include both alcohol-based antimicrobial agents having an aromatic ring and antimicrobial agents having a structure in which one or more hydrogen atoms of an aromatic hydrocarbon nucleus are substituted with a hydroxyl group.

[0018] As alcohol-based antibacterial agents having an aromatic ring, representative ones preferably include: compounds in which one hydrogen atom in a benzene ring is replaced by an alkyl group having 1 to 3 carbon atoms and a hydroxyl group, or compounds in which the hydrogen atom in the phenolic hydroxyl group of phenol is replaced by an alkyl group having 1 to 8 carbon atoms and a hydroxyl group. Among such compounds, the following compounds are particularly preferably mentioned, which are formed by replacing the hydrogen atom on the benzene ring or the hydrogen atom of the phenolic hydroxyl group and the alkyl group in the form of a carbon atom in the alkyl group having a hydroxyl group, which is farthest from the hydroxyl group, in a bonded manner to the carbon atom constituting the benzene ring or the oxygen atom in the phenolic hydroxyl group of phenol. As alcohol-based antibacterial agents having an aromatic ring, benzyl alcohol, phenoxyethanol, phenethyl alcohol, 3-phenylpropanol, etc. can be mentioned.

[0019] In addition, as antibacterial agents having a structure in which one or more hydrogen atoms of an aromatic hydrocarbon nucleus are substituted with a hydroxyl group, known antibacterial agents include: "parahydroxybenzoic acid esters" (also called "paraoxyb enzoic acid esters"), hinokitiol, 5-chloro-2-(2,4-dichlorophenoxy)phenol (common name: triclosan), 4,4'-dichloro-2-hydroxydiphenyl ether (common name: diclosan), o-benzyl-p-chlorophenol (chlorophenol), isopropylmethylphenol (3-methyl-4-isopropylphenol, IPMP), p-chloro-m-xylenol (4-chloro-3,5-dimethylphenol, PCMX), thymol, cresol, and the like. Known parahydroxybenzoic acid esters include parahydroxybenzoic acid esters such as methyl parahydroxybenzoate, ethyl parahydroxybenzoate, propyl parahydroxybenzoate, isopropyl parahydroxybenzoate, butyl parahydroxybenzoate, isobutyl parahydroxybenzoate, benzyl parahydroxybenzoate, and methyl parahydroxybenzoate sodium, and sodium salts thereof.

[0020] In the present invention, based on the aspect that it is particularly easy to improve the virus removal effect of the wiping sheet after wiping a large area, as the aromatic antibacterial agent, it is preferred to use an alcohol-based antibacterial agent or a paraben having an aromatic ring, among which phenoxyethanol or a paraben is more preferred, and phenoxyethanol or methyl paraben is particularly preferred.

[0021] Based on the aspect of the decline inhibition effect of the hygienic performance when wiping a large area with the aromatic antibacterial agent, the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 0.01 mass % or more, more preferably 0.05 mass % or more, and particularly preferably 0.1 mass % or more. In addition, based on the aspect of safety and the aspect of preventing damage to the substrate, the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 1.0 mass % or less, more preferably 0.5 mass % or less, and particularly preferably 0.3 mass % or less.

[0022] The amount of the aromatic antibacterial agent is preferably in the range of 0.01% by mass to 1.0% by mass, more preferably 0.05% by mass to 0.5% by mass, and particularly preferably 0.1% by mass to 0.3% by mass.

[0023] The nonionic surfactant contained in the aqueous cleaning liquid is preferably an alkylene oxide-added nonionic surfactant such as ethylene oxide, and is particularly preferably a polyoxyethylene alkyl ether, because the nonionic surfactant can effectively suppress the decrease in hygienic performance after wiping a large area by using it in combination with an aromatic antibacterial agent.

[0024] Polyoxyethylene alkyl ethers are also called "alcohol ethoxylates", and are nonionic surfactants obtained by ethoxylating alcohols with ethylene oxide, for example. The present inventors have found that by making the aqueous cleaning liquid impregnated in the nonwoven fabric contain polyoxyethylene alkyl ethers and aromatic antimicrobial agents together, it is possible to effectively prevent the sanitary performance such as virus removal ability from decreasing even after wiping a large area.

[0025] Polyoxyethylene alkyl ether is represented by the following general formula (1). In the following (1), "H 2m+1 C m " is a hydrophobic group, "O(CH2-CH2-O) n ” is a repeating part of ethylene oxide which serves as a hydrophilic group.

[0026] H 2m+1 C m O(CH2CH2O) n H(1)

[0027] In the formula, m represents an integer of 1 or more, and n represents an integer of 2 or more.

[0028] From the perspectives of safety, processability, and usability, the cleaning liquid impregnated in the wiping sheet is preferably aqueous, and from this perspective, the nonionic surfactant is preferably highly water-soluble. From this perspective, the ethylene oxide number of the polyoxyethylene alkyl ether of the nonionic surfactant is preferably 4 or more, more preferably 8 or more, and even more preferably 20 or more.

[0029] In addition, the ethylene oxide number of the polyoxyethylene alkyl ether is preferably 50 or less, particularly preferably 47 or less, from the viewpoint of hygienic performance and cleansing properties.

[0030] As a range, the ethylene oxide number of the polyoxyethylene alkyl ether is preferably 4 or more and 50 or less, more preferably 8 or more and 47 or less, and even more preferably 20 or more and 47 or less.

[0031] In addition, the number of ethylene oxide is represented by "n" in the above formula (1).

[0032] Furthermore, the nonionic surfactant preferably contains two or more polyoxyethylene alkyl ethers with different ethylene oxide numbers, and more preferably contains polyoxyethylene alkyl ethers with ethylene oxide numbers of 20 or more and polyoxyethylene alkyl ethers with ethylene oxide numbers less than 12, and particularly preferably contains polyoxyethylene alkyl ethers with ethylene oxide numbers of 21 or more and polyoxyethylene alkyl ethers with ethylene oxide numbers less than 12. The reason is that by such a configuration, the effect of suppressing the decrease in hygienic performance after wiping a large area is significantly excellent. In addition, the reason is that the various components contained in the cleaning liquid are suppressed from being adsorbed on the sheet fiber, and the cleaning liquid can be effectively released to the target surface.

[0033] In the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12, the ethylene oxide number is more preferably 4 or more and less than 12, and particularly preferably 8 or more and 10 or less, from the viewpoint of making the above-mentioned effect remarkable.

[0034] Regarding the length of the alkyl chain as the hydrophobic group in the polyoxyethylene alkyl ether, the carbon number m in the formula (1) is preferably 6 or more and 24 or less, and more preferably 8 or more and 18 or less, from the viewpoint of excellent balance with the number of ethylene oxides and thus easier to exhibit an excellent hygienic performance reduction inhibitory effect. When the aqueous cleaning liquid contains two or more polyoxyethylene alkyl ethers having different numbers of ethylene oxides, the carbon numbers m of the two may be different, but from the viewpoint of easier to exhibit an excellent hygienic performance reduction inhibitory effect, the carbon numbers m of the two are more preferably the same.

[0035] Based on the aspect of easily suppressing the decline in the hygienic performance of the wiping sheet after wiping a large area, the content of the nonionic surfactant in the aqueous cleaning liquid is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, and particularly preferably 0.05% by mass or more. In addition, based on the aspect of processability after wiping or preventing damage to the substrate, the content of the nonionic surfactant in the aqueous cleaning liquid is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, further preferably 3.0% by mass or less, and particularly preferably 2.0% by mass or less.

[0036] As a range, the content of the nonionic surfactant in the aqueous cleaning liquid is preferably 0.01 mass % to 5.0 mass %, more preferably 0.02 mass % to 4.0 mass %, further preferably 0.05 mass % to 3.0 mass %, particularly preferably 0.05 mass % to 2.0 mass %.

[0037] In order to more easily suppress the decline in the hygienic performance of the wiping sheet after wiping a large area, the content of the nonionic surfactant in the aqueous cleaning liquid is preferably greater than 1 part by mass and less than 1000 parts by mass, and particularly preferably greater than 50 parts by mass and less than 800 parts by mass, relative to 100 parts by mass of the aromatic antibacterial agent.

[0038] In addition, based on the aspect of being able to more easily suppress the decline in the hygienic performance of the wiping sheet after wiping a large area, the amount of nonionic surfactant, especially polyoxyethylene alkyl ether, in 100 parts by mass of the surfactant contained in the aqueous cleaning liquid is preferably 1 part by mass or more, and further preferably 10 parts by mass or more.

[0039] When the nonionic surfactant contains a polyoxyethylene alkyl ether having an ethylene oxide number of 12 or more and a polyoxyethylene alkyl ether having an ethylene oxide number of less than 12, respectively, the mass ratio C1:C2 of the amount C1 of the polyoxyethylene alkyl ether having an ethylene oxide number of 12 or more and the amount C2 of the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12 is preferably 100:0 to 10000, particularly preferably 100:0 to 1000, and most preferably 100:10 to 1000, from the aspect that the above-mentioned remarkable effect brought about by containing the two or more polyoxyethylene alkyl ethers is more easily obtained. Similarly, the mass ratio C1':C2 of the amount C1' of the polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more and the amount C2 of the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12 is preferably 100:0 to 10000, particularly preferably 100:0 to 1000, and most preferably 100:10 to 1000.

[0040] In order to further improve the sanitary performance of the wiping sheet, the aqueous cleaning liquid preferably also contains a bactericide. As a preferred bactericide, a quaternary ammonium salt can be mentioned. As a quaternary ammonium salt, there can be mentioned: alkyl trimethyl ammonium salt; polyoxyethylene alkyl methyl ammonium salt; alkyl benzyl dimethyl ammonium salts such as benzalkonium chloride; quaternary ammonium salts having a group formed by an aryl alkyl group interrupted by an ether group, a benzyl group and two methyl groups; alkyl pyridinium salts such as alkyl cetylpyridinium chloride, etc. As an example of a quaternary ammonium salt having a group formed by an aryl alkyl group interrupted by an ether group, a benzyl group and two methyl groups, there can be mentioned: benzethonium chloride. As an example of a group formed by an aryl alkyl group interrupted by an ether group, there can be mentioned: a group formed by the alkyl chain of an aryl alkyl group being disconnected by an oxygen atom. For example, a general quaternary ammonium salt is represented by the following formula (2).

[0041] [Chemical formula 1]

[0042]

[0043] In the formula, R 1 R represents a linear or branched alkyl group having 6 to 28 carbon atoms, a linear or branched alkenyl group having 6 to 28 carbon atoms, an arylalkyl group having 7 to 28 carbon atoms, or a group in which the alkyl group, the alkenyl group or the arylalkyl group is interrupted by an amide group, an ester group or an ether group. 2 It represents a straight-chain or branched alkyl group having 1 to 28 carbon atoms, a straight-chain or branched alkenyl group having 1 to 28 carbon atoms, an arylalkyl group having 7 to 28 carbon atoms, a group in which the alkyl group, the alkenyl group or the arylalkyl group is interrupted by an amide group, an ester group or an ether group, or an arylalkyl group having 7 to 28 carbon atoms. 3 and R 4 represents the same or different linear or branched alkyl groups having 1 or more and 3 or less carbon atoms. 2 , R 3 and R 4They can also form a pyridine ring. - It represents an anion which is a counter ion of the ammonium ion.

[0044] As A - Examples of the ion include carboxylate ions, sulfonate ions, and halogen ions. Among them, halogen ions are preferred, chloride ions and bromide ions are more preferred, and chloride ions are particularly preferred.

[0045] In view of excellent hygienic properties, the quaternary ammonium salt is preferably an alkylbenzyldimethylammonium salt, and particularly preferably benzalkonium chloride.

[0046] Based on the viewpoint of improving the hygienic performance of aqueous cleaning fluid, the content of the quaternary ammonium salt in the aqueous cleaning fluid is preferably more than 0.01 mass %, more preferably more than 0.02 mass %, particularly preferably more than 0.03 mass %. In addition, based on the viewpoint of safety, the content of the quaternary ammonium salt in the aqueous cleaning fluid is preferably below 5.0 mass %, more preferably below 3.0 mass %, particularly preferably below 1.0 mass %.

[0047] As a range, the content of the quaternary ammonium salt in the aqueous cleaning liquid is preferably 0.01 mass % to 5.0 mass %, more preferably 0.02 mass % to 3.0 mass %, particularly preferably 0.03 mass % to 1.0 mass %.

[0048] In the present invention, the aqueous cleaning liquid preferably contains an antibacterial agent other than the aromatic antibacterial agent in order to further improve the hygienic performance of the wiping sheet.

[0049] As antibacterial agents other than aromatic antibacterial agents, glycol compounds can be cited. Glycol compounds are compounds that do not have an aromatic ring and have two hydroxyl groups, and known ones include propylene glycol, dipropylene glycol, isoprene glycol, ethylene glycol, butanediol, pentanediol, 1,2-hexanediol, 1,2-octanediol, etc. Among them, dipropylene glycol is preferably used in order to further improve the hygienic performance.

[0050] When a diol compound used as an antibacterial agent is contained in an aqueous cleaning liquid, the amount of the diol compound in the aqueous cleaning liquid is preferably from 0.01 mass % to 1.0 mass %, more preferably from 0.02 mass % to 0.5 mass %, and particularly preferably from 0.05 mass % to 0.3 mass %, in terms of improving antibacterial performance and safety.

[0051] The aqueous cleaning liquid may contain, in addition to a nonionic surfactant, a cationic surfactant, an anionic surfactant, and / or an amphoteric surfactant as a surfactant within the scope of the effect of the present invention. From the viewpoint of cleaning properties, the aqueous cleaning liquid preferably contains only a nonionic surfactant as a surfactant, or contains an amphoteric surfactant in addition to a nonionic surfactant. As the amphoteric surfactant used in the present invention, for example, at least one selected from lauryl dimethylamine oxide, alkyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, etc. can be cited. In the case of containing an amphoteric surfactant, as its amount in the aqueous cleaning liquid, it can be suitably cited as 0.01 mass % or more and 0.5 mass % or less.

[0052] The aqueous cleaning fluid may contain additives in addition to the above-mentioned components within the scope of the effects of the present invention. As additives, surfactants other than the above-mentioned nonionic surfactants and amphoteric surfactants, bactericides other than alcohols and quaternary ammonium salts, preservatives, aromatics, fragrances, deodorants, pH value regulators, metal chelating agents, viscosity modifiers, solvents, etc. may be cited. These may be used alone or in combination. These additives may be used as required based on the properties required by the wiping sheet, and the amount used in the case of use is preferably 0.001% by mass or more and 20% by mass or less in the aqueous cleaning fluid.

[0053] From the perspective of hygienic performance and safety, the pH value of the aqueous cleaning liquid of the wiping sheet at 25° C. is preferably 3.0 or more, more preferably 4.0 or more, and preferably 11.0 or less, more preferably 10.0 or less. In order to adjust the pH value of the cleaning liquid to the above range, for example, a pH adjuster can be added to such an extent that the effect of the present invention is exerted.

[0054] The aqueous cleaning liquid constituting the wiping sheet of the present invention is preferably water-based. The water content contained in the aqueous cleaning liquid is preferably 80.0% by mass or more, more preferably 90.0% by mass or more, and preferably 99.8% by mass or less, more preferably 99.0% by mass or less relative to the total mass of the cleaning liquid.

[0055] Next, the nonwoven fabric constituting the wiping sheet will be described.

[0056] From the perspective of the amount of liquid transferred to the wiping surface, the proportion of the aqueous cleaning liquid impregnated in the nonwoven fabric is preferably 100% by mass or more, more preferably 200% by mass or more, relative to the mass of the nonwoven fabric. From the perspective of the amount of liquid transferred to the wiping surface, it is preferably 600% by mass or less, more preferably 500% by mass or less.

[0057] As the fibers constituting the nonwoven fabric, there are: regenerated fibers, natural fibers, synthetic fibers, etc. From the viewpoint of safety or the ease of penetration and retention of aqueous cleaning liquids, it is preferred to contain regenerated fibers. As regenerated fibers, there are: rayon fibers, acetate fibers, etc., and from the viewpoint of safety or versatility, rayon fibers are preferably used. As natural fibers, there are: cotton yarn, hemp, collagen fibers, etc. From the viewpoint of manufacturing efficiency, synthetic fibers are preferably composed of fiber-forming resins as raw materials. As such resins, various thermoplastic resins can be cited, for example. As thermoplastic resins, for example, polyolefin resins such as polyethylene (PE) or polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), polyamide resins, vinyl resins such as polyvinyl chloride or polystyrene, acrylic resins such as polyacrylic acid or polymethyl methacrylate, fluororesins such as polyperfluoroethylene, etc., of which one can be used alone, or two or more can be used in combination.

[0058] From the perspective of ease of penetration and retention of aqueous cleaning liquid, the proportion of regenerated fibers in the nonwoven fabric is preferably 1% by mass or more. From this perspective, the proportion of regenerated fibers in the nonwoven fabric is particularly preferably 5% by mass or more, and more preferably 10% by mass or more. On the other hand, from the perspective of operability during wiping, the proportion of regenerated fibers in the nonwoven fabric is preferably 99% by mass or less, and more preferably 90% by mass or less.

[0059] From the perspective of the permeability of the aqueous cleaning solution, in the dry state of the nonwoven fabric, the amount of water per m2 of the nonwoven fabric is 2 The mass of the regenerated fiber (g / m 2 ) is preferably 5g / m 2 More preferably 10 g / m 2 From the perspective of continuously releasing an appropriate amount of aqueous cleaning liquid during wiping, the nonwoven fabric is 2 The mass of the regenerated fiber (g / m 2 ) is preferably 60g / m 2 Below, more preferably 50g / m 2 Below, more preferably 40g / m 2 the following.

[0060] From the perspective of hygienic performance, the mass of aqueous cleaning liquid per 1g of nonwoven fabric is relative to the mass of water per 1m 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.05 or more, more preferably 0.075 or more, and even more preferably 0.01 or more. From the perspective of the amount of liquid transferred to the wiping surface and the hygienic performance, the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric is relative to the mass of the aqueous cleaning liquid per 1m of the nonwoven fabric. 2The mass of the regenerated fiber (g / m 2 ) is preferably 1.0 or less, more preferably 0.6 or less, and further preferably 0.4 or less.

[0061] From the perspective of hygienic performance, the mass of aromatic antimicrobial agent in 1g of aqueous cleaning solution per 1m of nonwoven fabric is 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.0002 or more, more preferably 0.0003 or more, and further preferably 0.0005 or more. From the perspective of hygienic performance, the mass of the aromatic antimicrobial agent in each 1g of aqueous cleaning solution of the nonwoven fabric is relative to the mass of the aromatic antimicrobial agent in each 1m 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.005 or less, more preferably 0.003 or less, and further preferably 0.001 or less.

[0062] From the perspective of hygienic performance, the mass of nonionic surfactant in 1g of aqueous cleaning solution per 1m of nonwoven fabric is 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.0001 or more, more preferably 0.0005 or more, and further preferably 0.0008 or more. From the perspective of hygienic performance, the mass of the nonionic surfactant in the aqueous cleaning solution per 1g of the nonwoven fabric is relative to the mass of the nonionic surfactant in the aqueous cleaning solution per 1m of the nonwoven fabric. 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.02 or less, more preferably 0.01 or less, and further preferably 0.007 or less.

[0063] From the viewpoint of operability during wiping, the fineness of the regenerated fiber is preferably 0.5 dtex or more, more preferably 0.75 dtex or more, and further preferably 1.0 dtex or more, and the upper limit is preferably 3.0 dtex or less, more preferably 2.5 dtex or less, and further preferably 2.0 dtex or less.

[0064] When the nonwoven fabric contains synthetic fibers, the amount of synthetic fibers in the nonwoven fabric is preferably 99% by mass or less, particularly preferably 90% by mass or less, and further preferably 80% by mass or less, from the perspective of ease of penetration and retention of aqueous cleaning liquid. On the other hand, from the perspective of operability during wiping or removal of stains, the proportion of synthetic fibers in the nonwoven fabric is preferably 5% by mass or more, more preferably 10% by mass or more.

[0065] From the perspective of operability during wiping and stain removal efficiency, the fineness of the synthetic fiber is preferably greater than 0.5 dtex, more preferably greater than 1 dtex, and further preferably greater than 1.2 dtex. In addition, the upper limit is preferably less than 4 dtex, more preferably less than 3.5 dtex, and further preferably less than 3 dtex.

[0066] In nonwoven fabrics, fibers such as regenerated fibers, synthetic fibers, and natural fibers are piled up, entangled, or combined with each other to form a fiber assembly. The fibers constituting the nonwoven fabric may or may not be fused with each other. The wiping sheet may be composed of only nonwoven fabric, or may have other sheet materials or other components in addition to the nonwoven fabric.

[0067] The weight per unit area of ​​the nonwoven fabric constituting the wiping sheet is preferably 30 g / m2 in a dry state of the nonwoven fabric. 2 More preferably 35g / m 2 More preferably, 40 g / m 2 The upper limit is preferably 100 g / m 2 Below, more preferably 90g / m 2 Below, more preferably 80g / m 2 The dry state means that the moisture content in the nonwoven fabric is 3% by mass or less. When the weight per unit area of ​​the nonwoven fabric in the dry state is within this range, a sufficient amount of aqueous cleaning liquid can be impregnated into the wiping sheet, thereby exhibiting excellent hygienic performance, and absorbing a large amount of stains to be removed, thereby achieving excellent strength during wiping.

[0068] As the nonwoven fabric, spunlace nonwoven fabric, meltblown nonwoven fabric, spunbond nonwoven fabric, air-through nonwoven fabric, resin-bonded nonwoven fabric, needle-punched nonwoven fabric, etc. can be used. In addition, a composite of these nonwoven fabrics can also be used. Among these, spunlace nonwoven fabric is preferably used from the viewpoint that it is easy to be entangled with fibrous dirt such as hair and cotton wool.

[0069] The nonwoven fabric and the wiping sheet of the present invention having the nonwoven fabric can be made into a roughly rectangular sheet having a long side direction and a width direction orthogonal to the long side direction. In addition, the wiping sheet may or may not have a concave-convex portion having a macro pattern of a curved portion on at least one side thereof.

[0070] From the viewpoint of providing sufficient strength when using the wiping sheet, the wiping sheet of the present invention may also be provided with a scrim for supporting the nonwoven fabric. The scrim is also preferably arranged in the central region in the thickness direction of the nonwoven fabric. The scrim is capable of being intertwined with the synthetic fibers constituting the nonwoven fabric, and may be in the form of a mesh, a lattice, or a line.

[0071] As the raw material constituting the scrim, resins can be used, for example, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon 6 and nylon 66, acrylonitrile resins such as polyacrylonitrile, vinyl resins such as polyvinyl chloride and polystyrene, vinylidene resins such as polyvinylidene chloride, etc. can be used.

[0072] Based on the viewpoint of the mutual entanglement of the constituent fibers and the scrim, and the strength of the wiping sheet, the wire diameter (cross-sectional diameter) of the scrim can be appropriately adjusted according to the degree of mutual entanglement of the fibers, preferably 10 μm or more, more preferably 100 μm or more, and preferably 2000 μm or less, more preferably 1000 μm or less. The wire diameters of the scrim may be partially different or the same. In the case of partially different wire diameters, the wire diameter of the scrim is set to its average value. In addition, the unit area weight of the scrim is preferably 1 g / m 2 More preferably, 3 g / m 2 More than, and preferably 20g / m 2 Below, more preferably 10g / m 2 the following.

[0073] The wiping sheet can be used alone or in a cleaning tool such as a scraper for floor surfaces, walls, and other structures; cabinets, window panes, mirrors, doors, door handles, and other construction items; mats, carpets, tables, and other furniture; kitchens, toilets, and body cleaning, sanitary products, and packaging.

[0074] In particular, since the nonwoven fabric of the wiping sheet of the present invention is impregnated with a cleaning solution containing an aromatic antibacterial agent and a nonionic surfactant, after wiping a large area, the sanitary performance such as virus removal ability is effectively suppressed from decreasing. Therefore, the wiping sheet of the present invention has excellent sanitary performance and can reduce the number of sheets used, thereby achieving the effects of reducing cleaning costs and improving the cleanliness of cleaning.

[0075] As mentioned above, although this invention was demonstrated based on the preferred embodiment of this invention, this invention is not limited to the said embodiment.

[0076] Regarding the above-mentioned embodiment, the present invention further discloses the following wiping sheet.

[0077] <1>

[0078] A wiping sheet material comprising a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric, and

[0079] The aqueous cleaning solution contains an aromatic antimicrobial agent and a nonionic surfactant.

[0080] <2>

[0081] The wiping sheet as described in <1> above, wherein the content of the above-mentioned nonionic surfactant in the above-mentioned aqueous cleaning liquid is preferably 0.01 mass % or more, more preferably 0.02 mass % or more, particularly preferably 0.05 mass % or more, and is preferably 5.0 mass % or less, more preferably 4.0 mass % or less, further preferably 3.0 mass % or less, and particularly preferably 2.0 mass % or less.

[0082] <3>

[0083] The wiping sheet as described in the above <1> or <2>, wherein the nonionic surfactant is a polyoxyethylene alkyl ether.

[0084] <4>

[0085] The wiping sheet as described in the above <3>, wherein the number of ethylene oxides in the polyoxyethylene alkyl ether is 20 or more.

[0086] <5>

[0087] The wiping sheet as described in <3> or <4> above, comprising the polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more, and

[0088] The above-mentioned polyoxyethylene alkyl ether having an ethylene oxide number of less than 12.

[0089] <6>

[0090] A wiping sheet as described in any one of items <1> to <3> above, wherein the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, particularly preferably 0.1% by mass or more, and is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, particularly preferably 0.3% by mass or less.

[0091] <7>

[0092] The wipe sheet as described in any one of <1> to <6> above, wherein the aromatic antimicrobial agent is phenoxyethanol or methylparaben.

[0093] <8>

[0094] The wiping sheet as described in any one of <1> to <7> above, further comprising a quaternary ammonium salt.

[0095] <9>

[0096] The wiping sheet as described in the above <8>, wherein the quaternary ammonium salt is benzalkonium chloride.

[0097] <10>

[0098] The wiping sheet as described in any one of <1> to <9> above, further comprising a diol compound.

[0099] <11>

[0100] The wiping sheet as described in <10> above, wherein the amount of the diol compound in the aqueous cleaning liquid is preferably 0.01 mass % to 1.0 mass %, more preferably 0.02 mass % to 0.5 mass %, particularly preferably 0.05 mass % to 0.3 mass %.

[0101] <12>

[0102] The wiping sheet as described in the above <10> or <11>, wherein the diol compound is dipropylene glycol.

[0103] <13>

[0104] The wiping sheet as described in any one of <1> to <12> above, wherein the nonwoven fabric contains regenerated fibers.

[0105] <14>

[0106] The wiping sheet as described in the above-mentioned <13>, wherein the regenerated fiber is rayon fiber.

[0107] <15>

[0108] The wiping sheet as described in any one of items <1> to <14> above, wherein the proportion of regenerated fibers in the nonwoven fabric is preferably 1% by mass or more, more preferably 5% by mass or more, further preferably 10% by mass or more, and further, the proportion of regenerated fibers in the nonwoven fabric is preferably 99% by mass or less, more preferably 90% by mass or less.

[0109] <16>

[0110] The wiping sheet as described in any one of <1> to <15> above, wherein the nonwoven fabric preferably has a weight per unit area of ​​30 g / m 2 More preferably 35g / m 2 More preferably, 40 g / m 2 In addition, the nonwoven fabric preferably has a weight per unit area of ​​100 g / m 2 Below, more preferably 90g / m 2 Below, more preferably 80g / m 2 the following.

[0111] <17>

[0112] The wiping sheet as described in any one of <1> to <16> above, wherein the nonwoven fabric has a thickness of 1 m2 The mass of the regenerated fiber is preferably 5g / m 2 More preferably 10 g / m 2 In addition, the nonwoven fabric is 2 The mass of the regenerated fiber is preferably 60g / m 2 Below, more preferably 50g / m 2 Below, more preferably 40g / m 2 the following.

[0113] <18>

[0114] A wiping sheet as described in any one of items <1> to <17> above, wherein the proportion of the aqueous cleaning liquid impregnated in the non-woven fabric is preferably 100% by mass or more, more preferably 200% by mass or more, relative to the mass of the non-woven fabric, and the proportion of the aqueous cleaning liquid impregnated in the non-woven fabric is preferably 600% by mass or less, more preferably 500% by mass or less.

[0115] <19>

[0116] The wiping sheet as described in any one of <1> to <18>, wherein the mass of the aqueous cleaning liquid per 1 g of the nonwoven fabric is relative to the mass of the aqueous cleaning liquid per 1 m of the nonwoven fabric. 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.05 or more, more preferably 0.075 or more, and further preferably 0.01 or more. In addition, the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric is relative to the mass of the aqueous cleaning liquid per 1m 2 The mass of the regenerated fiber (g / m 2 ) is preferably 1.0 or less, more preferably 0.6 or less, and further preferably 0.4 or less.

[0117] <20>

[0118] The wiping sheet as described in any one of <1> to <19>, wherein the mass of the aromatic antimicrobial agent in the aqueous cleaning solution per 1 g of the nonwoven fabric is relative to the mass of the aromatic antimicrobial agent in the aqueous cleaning solution per 1 m of the nonwoven fabric. 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.0002 or more, more preferably 0.0003 or more, and further preferably 0.0005 or more. In addition, the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1g of the nonwoven fabric is relative to the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1m of the nonwoven fabric. 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.005 or less, more preferably 0.003 or less, and further preferably 0.001 or less.

[0119] <21>

[0120] The wiping sheet as described in any one of <1> to <20>, wherein the mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of the nonwoven fabric is 100% relative to the mass of the nonionic surfactant per 1 m2 of the nonwoven fabric. 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.0001 or more, more preferably 0.0005 or more, and further preferably 0.0008 or more. In addition, the mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of the nonwoven fabric is relative to the mass of the nonionic surfactant per 1 m 2 The mass of the regenerated fiber (g / m 2 ) is preferably 0.02 or less, more preferably 0.01 or less, and further preferably 0.007 or less.

[0121] Example

[0122] Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the present invention is not limited to these examples. Unless otherwise specified, "%" means "mass %".

[0123] [Examples 1 to 10 and Comparative Examples 1 to 5]

[0124] As the nonwoven fabric containing cellulose fibers, a nonwoven fabric was used in which synthetic fibers and fibers containing cellulose fibers were spunlace and which had a scrim (made of polypropylene, with a wire diameter of about 100 μm and a weight per unit area of ​​5 g / m2) in the central region in the thickness direction. 2 The fiber composition of the nonwoven fabric is PET fiber (fineness 1.7 dtex): acrylic fiber (fineness 1.0 dtex): rayon fiber (fineness 1.7 dtex) = 70:15:15. The weight per unit area in the dry state is 70 g / m 2 , dimensions are 285mm×205mm.

[0125] The nonwoven fabric was impregnated with an aqueous cleaning liquid in an amount of 350% by mass based on the mass of the nonwoven fabric to prepare a target wet wiping sheet.

[0126] The aqueous cleaning solution is made into the following aqueous solution: containing 0.05% of amphoteric surfactant (lauryl dimethylamine oxide), 2% of alcohol, 1% of solvent (methyl propanediol), 0.01% of preservative (1,2-benzisothiazolin-3-one), 0.01% of metal chelator, and in addition, the components described in Table 1 are contained in the amounts described in the table. A pH adjuster is also contained in such a way that the pH value is 9.0. The pH value of the cleaning solution at 25°C before impregnation is adjusted using a pH measuring device (manufactured by HORIBA, pH meter F22). The content of water in the cleaning solution is 90.0% by mass or more. It should be noted that the amount of each component in Table 1 is the content of the active ingredient contained in the preparation, not the amount of the preparation.

[0127] [Virus removal activity value]

[0128] The wet wiping sheets of the examples and comparative examples were subjected to a 0.64 kN / m 2 The load was 100%, and a paved floor (Combit New Advance 101, manufactured by WOOD ONE) was used as the wiping object surface. 20 pieces (equivalent to 32.4 m 2 ) was wiped continuously. The cleanliness of the floor before wiping was determined by washing with a 70% ethanol aqueous solution and drying with Kimtowel (registered trademark). The wiping sheets of the examples and comparative examples after wiping were evaluated according to the "Bacteria Removal Performance Test of Wet Wiping Cloths" stipulated by the Japan Cleaning Paper Cotton Industry Association.

[0129] Influenza A virus was selected as the virus type. The number of viruses was prepared to be 1.1×10 9 / mL. 0.01mL of virus preparation solution was inoculated on a stainless steel plate and spread to a range of 15mm×90mm using a cell spreader. The plate was wiped using the wiping sheet of the above-mentioned embodiment and comparative example. The wiping operation was performed by applying 0.78kN / m 2 Under the load state, the plate was moved back and forth 5 times at intervals of about 2 seconds. After the wiping operation, the stainless steel plate was placed in an environment of 25°C for 5 minutes, and then the wiping part was wiped back and forth 10 times with a rag (made). The rag was pre-impregnated with 1.5mL of SCDLP (Soya Casein Digest Lecithin Polysorbate) liquid culture medium. Then, it was stirred by a vortex mixer to obtain a virus suspension. In addition, the virus suspension obtained by the above operation without wiping with a wiping sheet was used as a blank sample.

[0130] A 10-fold dilution series of the virus suspension was prepared using EMEM (Eagle's Minimum Essential Medium), and the virus infection titer per 0.1 mL of the virus suspension was measured using a plaque assay, and the virus infection titer (PFU (Plaque forming unit) / stainless steel plate) was calculated.

[0131] In addition, the same operation was performed using the control material to obtain the common logarithm mean of the measured virus infection titer (PFU / stainless steel plate). It should be noted that the fine white cloth No. 3 (285 mm × 205 mm) specified in the JIS L0803 dye fastness test accompanying white cloth was impregnated with physiological saline containing 0.05% polysorbate 80 instead of 150% of the cleaning solution, and the obtained product was used as the control material. The fine white cloth No. 3 was previously cleaned and sterilized using the method specified in the test method.

[0132] The virus removal activity value was quantified according to the following calculation formula. The results are shown in Table 1.

[0133] Virus removal activity value = X′-Y′

[0134] X': The average value of the common logarithm of the virus infection titer (PFU / stainless steel plate) obtained by repeating the test three times on the photographic material.

[0135] Y': The average value of the common logarithm of the virus infection titer (PFU / stainless steel plate) in the results of three repeated tests using the wipe sheet as the test object.

[0136] Based on the magnitude of the virus removal activity value calculated by the above calculation formula, the virus removal performance was scored according to the following criteria.

[0137] S: >4.0

[0138] A: 3.5~4.0

[0139] B: 2.5~3.4

[0140] C: 2.0~2.4

[0141] D: 0~1.9

[0142] [Table 1]

[0143]

[0144] According to the results shown in Table 1, it can be seen that by adding a nonionic surfactant and an aromatic antibacterial agent to the aqueous cleaning liquid, the virus removal activity value of the wiping sheet after wiping 20 floors is excellent and improved. Therefore, it can be seen that the wiping sheet according to the present invention can effectively suppress the decrease in the hygienic performance of the wiped surface compared to the initial stage of wiping even when the wiping area increases and the release amount of the cleaning liquid decreases.

[0145] Industrial Applicability

[0146] According to the present invention, even when the wiping area is increased and the amount of released cleaning liquid is reduced, the hygienic performance of the wiping target surface is effectively suppressed from being reduced compared to the initial stage of wiping.

Claims

1. A wiping sheet comprising a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric, and The aqueous cleaning solution contains an aromatic antibacterial agent and a nonionic surfactant.

2. The wiping sheet according to claim 1, in, The nonionic surfactant is polyoxyethylene alkyl ether.

3. The wiping sheet according to claim 2, in, The number of ethylene oxides in the polyoxyethylene alkyl ether is 20 or more.

4. The wiping sheet according to claim 2, comprising: The polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more, and The polyoxyethylene alkyl ether having an ethylene oxide number of less than 12.

5. The wiping sheet according to any one of claims 1 to 4, in, The aromatic antibacterial agent is phenoxyethanol or methylparaben. 6 . The wiping sheet according to claim 1 , further comprising a quaternary ammonium salt.

7. The wiping sheet according to claim 6, in, The quaternary ammonium salt is benzalkonium chloride. 8 . The wiping sheet according to claim 1 , further comprising a diol compound.

9. The wiping sheet according to claim 8, in, The diol compound is dipropylene glycol.

10. The wiping sheet according to any one of claims 1 to 9, in, The non-woven fabric is per 1m 2 The mass of the recycled fiber is 5g / m 2 Above and 60g / m 2 the following.

11. The wiping sheet according to any one of claims 1 to 10, in, The ratio of the aqueous cleaning liquid impregnated into the nonwoven fabric is 100 mass % or more and 600 mass % or less relative to the mass of the nonwoven fabric.

12. The wiping sheet according to any one of claims 1 to 11, in, The mass of the aqueous cleaning liquid per 1g of the nonwoven fabric is relative to g / m 2 The nonwoven fabric is measured per 1m 2 The mass ratio of the regenerated fiber is 0.05 or more and 1.0 or less.

13. The wiping sheet according to any one of claims 1 to 12, in, The mass of the aromatic antimicrobial agent in the aqueous cleaning solution per 1 g of the nonwoven fabric is relative to the mass of the aromatic antimicrobial agent in g / m 2 The nonwoven fabric is measured per 1m 2 The mass ratio of the regenerated fiber is 0.0002 or more and 0.005 or less.

14. The wiping sheet according to any one of claims 1 to 13, in, The mass of the nonionic surfactant per 1 g of the aqueous cleaning solution in the nonwoven fabric is relative to the mass of the nonionic surfactant in g / m 2 The nonwoven fabric is measured per 1m 2 The mass ratio of the regenerated fiber is 0.0001 or more and 0.02 or less.

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