JP7646943B2 - Wiping Sheet - Google Patents

Description

The present invention relates to a wet wiping sheet.

So-called wet sheets (cleaning sheets) made by soaking nonwoven fabric in an aqueous solution containing disinfectants etc. are simple, easy to use, and disposable, so they can always be used cleanly, and are therefore used not only in the home but also in environmental maintenance in food factories, kitchens, and medical facilities.

The aqueous cleaning solution contained in the wet wipes is often blended with an antibacterial agent or a bactericide in order to improve the sanitary condition of the object to be wiped. For example, Patent Document 1 describes a disinfecting wipe in which a base sheet is impregnated with an aqueous disinfecting agent. The aqueous disinfecting agent contained in this disinfecting wipe contains a quaternary ammonium salt type surfactant, an inorganic electrolyte and/or a citrate salt, an alkaline agent, and water.
Patent Document 2 describes that the aqueous disinfectant contained in the disinfecting sheet contains a quaternary ammonium salt surfactant, potassium hydroxide, an aminocarboxylic acid chelating agent, and water.

JP 2018-027916 A JP 2019-112342 A

The present invention relates to a wiping sheet having a nonwoven fabric and an aqueous cleaning liquid impregnated into the nonwoven fabric.
In one embodiment, the aqueous cleaning solution preferably comprises an aromatic antimicrobial agent and a non-ionic surfactant.

Detailed Description of the Invention

When a wet sheet is used to wipe a large surface, a sufficient amount of aqueous cleaning liquid is supplied at the beginning of wiping, providing sufficient hygiene to the surface, but as the wiping area increases, the hygiene effect provided to the surface tends to gradually decrease. This tendency also applies to the technologies described in Patent Documents 1 and 2 mentioned above.

Therefore, the present invention relates to a wiping sheet that can maintain the hygiene performance of the surface being wiped at the same level as at the beginning of wiping, even when the wiping area increases and the amount of cleaning liquid released decreases.

The present invention will now be described based on its preferred embodiments.
In the present invention, "wiping" includes both cleaning and wiping down, and includes, for example, cleaning of buildings such as floors, walls, ceilings and pillars, cleaning of fixtures and equipment, wiping down objects, wiping the body and tools related to the body, and the like.
In the following description, the aqueous cleaning solution may simply be referred to as the "cleaning solution."

The present invention relates to a wiping sheet having a nonwoven fabric and an aqueous cleaning liquid impregnated into the nonwoven fabric. As a result of extensive research by the present inventors into the composition of an aqueous cleaning liquid that can maintain its hygienic performance after wiping a large area, it has been surprisingly found that when the aqueous cleaning liquid contains an aromatic antibacterial agent and a nonionic surfactant, it is possible to excellently and effectively improve the virus removal effect of the wiping sheet after wiping a large area.

Aromatic antibacterial agents include both alcohol-based antibacterial agents having an aromatic ring, and antibacterial agents having a structure in which one or more hydrogen atoms of an aromatic hydrocarbon nucleus are replaced with a hydroxyl group.

Representative examples of alcohol-based antibacterial agents having an aromatic ring include compounds in which one of the hydrogen atoms in a benzene ring is replaced by an alkyl group having 1 to 3 carbon atoms and a hydroxyl group, or compounds in which a hydrogen atom in a phenolic hydroxyl group of phenol is replaced by an alkyl group having 1 to 8 carbon atoms and a hydroxyl group. Among such compounds, compounds in which a hydrogen atom on a benzene ring or a hydrogen atom in a phenolic hydroxyl group is replaced by an alkyl group having one hydroxyl group, with the carbon atom farthest from the hydroxyl group being bonded to a carbon atom constituting the benzene ring or an oxygen atom in the phenolic hydroxyl group of phenol, are particularly preferred. Examples of alcohol-based antibacterial agents having an aromatic ring include benzyl alcohol, phenoxyethanol, phenethyl alcohol, and 3-phenylpropanol.

Antibacterial agents having a structure in which one or more hydrogen atoms of an aromatic hydrocarbon nucleus are replaced with a hydroxyl group include "parabens" (also called "paraoxybenzoic 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 (chlorophene), isopropylmethylphenol (3-methyl-4-isopropylphenol, IPMP), parachlorometaxylenol (4-chloro-3,5-dimethylphenol, PCMX), thymol, cresol, etc. Known parabens include paraoxybenzoic acid esters such as methylparaben, ethylparaben, propylparaben, isopropylparaben, butylparaben, isobutylparaben, benzylparaben, and sodium methylparaben, as well as their sodium salts.

In the present invention, it is preferable to use an alcohol-based antibacterial agent having an aromatic ring or parabens as the aromatic antibacterial agent, since this is particularly likely to improve the virus removal effect of the wiping sheet after wiping a large area, and among these, it is more preferable to use phenoxyethanol or parabens, and it is particularly preferable to use phenoxyethanol or methylparaben.

In the aqueous cleaning solution, the amount of the aromatic antibacterial agent is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and particularly preferably 0.1% by mass or more, from the viewpoint of easily obtaining the effect of suppressing the deterioration of hygienic performance when wiping a large area by using the aromatic antibacterial agent, and furthermore, the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and particularly preferably 0.3% by mass or less, from the viewpoint of safety and preventing damage to the substrate.
As for the range, the amount of the aromatic antibacterial agent is preferably from 0.01% to 1.0% by mass, more preferably from 0.05% to 0.5% by mass, and particularly preferably from 0.1% to 0.3% by mass.

As the nonionic surfactant contained in the aqueous cleaning solution, an alkylene oxide-added nonionic surfactant such as ethylene oxide is preferred, since when used in combination with an aromatic antibacterial agent, this is particularly effective in preventing a decrease in hygiene performance after wiping a large area, and polyoxyethylene alkyl ether is particularly preferred.

Polyoxyethylene alkyl ether, also known as "alcohol ethoxylate", is a nonionic surfactant obtained, for example, by ethoxylating alcohol with ethylene oxide. The inventors have discovered that by incorporating both polyoxyethylene alkyl ether and an aromatic antibacterial agent in the aqueous cleaning solution impregnated into the nonwoven fabric, it is possible to effectively prevent a decrease in hygienic performance, such as virus removal ability, even after wiping a large area.

Polyoxyethylene alkyl ether is represented by the following general formula (1): In the following (1), "H _2m+1 C _m " is a hydrophobic group, and "O(CH ₂ --CH ₂ --O) _n " is a repeating portion of ethylene oxide which is a hydrophilic group.

H _2m+1 C _m O(CH ₂ CH ₂ O) _n H (1)
In the formula, m represents an integer of 1 or more, and n represents an integer of 2 or more.

The cleaning solution impregnated into the wiping sheet is preferably aqueous from the viewpoints of safety, finish, and usability, and from this viewpoint, the nonionic surfactant is preferably highly water-soluble. From this viewpoint, the nonionic surfactant is preferably a polyoxyethylene alkyl ether having an ethylene oxide number of 4 or more, more preferably 8 or more, and even more preferably 20 or more.
In addition, the ethylene oxide number of the polyoxyethylene alkyl ether is preferably 50 or less from the standpoint of sanitary performance and washability, and is particularly preferably 47 or less.
As for the 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.
The number of ethylene oxide units is represented as "n" in the above formula (1).

Furthermore, the nonionic surfactant preferably contains two or more polyoxyethylene alkyl ethers with different ethylene oxide numbers, more preferably contains a polyoxyethylene alkyl ether with an ethylene oxide number of 20 or more and a polyoxyethylene alkyl ether with an ethylene oxide number of less than 12, and particularly preferably contains a polyoxyethylene alkyl ether with an ethylene oxide number of 21 or more and a polyoxyethylene alkyl ether with an ethylene oxide number of less than 12. This is because the effect of suppressing the deterioration of hygiene performance after wiping a large area is significantly excellent by configuring it in this way. In addition, various components contained in the cleaning liquid are suppressed from being adsorbed to the sheet fibers, and the cleaning liquid can be effectively released to the target surface.

In order to make the above-mentioned effect more pronounced, in polyoxyethylene alkyl ethers having an ethylene oxide number of less than 12, it is more preferable that the ethylene oxide number is 4 or more and less than 12, and particularly preferably 8 or more and 10 or less.

The length of the alkyl chain, which is the hydrophobic group in the polyoxyethylene alkyl ether, is well balanced with the number of ethylene oxides, and therefore the carbon number m in formula (1) is preferably 6 to 24, more preferably 8 to 18. When the aqueous cleaning solution contains two or more polyoxyethylene alkyl ethers with different numbers of ethylene oxides, the carbon numbers m of both may be different, but it is more preferable that they are the same, since this makes it easier to exert the excellent effect of inhibiting the deterioration of hygiene performance.

The content of the nonionic surfactant in the aqueous cleaning solution 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, from the viewpoint of easily suppressing the deterioration of the hygienic performance of the wiping sheet after wiping a large area, and the content of the nonionic surfactant in the aqueous cleaning solution is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, even more preferably 3.0% by mass or less, and particularly preferably 2.0% by mass or less, from the viewpoint of preventing the finish after wiping and damage to the substrate.
As for the range, the content of the nonionic surfactant in the aqueous cleaning solution is preferably from 0.01% by mass to 5.0% by mass, more preferably from 0.02% by mass to 4.0% by mass, even more preferably from 0.05% by mass to 3.0% by mass, and particularly preferably from 0.05% by mass to 2.0% by mass.

In order to further prevent the deterioration of the hygienic performance of the wiping sheet after wiping a large area, the content of the nonionic surfactant in the aqueous cleaning solution is preferably 1 part by mass or more and 1,000 parts by mass or less per 100 parts by mass of the aromatic antibacterial agent, and particularly preferably 50 parts by mass or more and 800 parts by mass or less.

In addition, in order to further prevent deterioration in the hygienic performance of the wiping sheet after wiping a large area, the amount of nonionic surfactant, particularly polyoxyethylene alkyl ether, per 100 parts by mass of surfactant contained in the aqueous cleaning solution is preferably 1 part by mass or more, and even more preferably 10 parts by mass or more.

When the nonionic surfactant contains both a polyoxyethylene alkyl ether with an ethylene oxide number of 12 or more and a polyoxyethylene alkyl ether with an ethylene oxide number of less than 12, in order to more easily obtain the remarkable effect of containing two or more types of polyoxyethylene alkyl ether, the mass ratio C1:C2 of the amount C1 of the polyoxyethylene alkyl ether with a polyethylene oxide number of 12 or more and the amount C2 of the polyoxyethylene alkyl ether with an ethylene oxide number of less than 12 is preferably 100:0 to 10,000, more preferably 100:0 to 1,000, and most preferably 100:10 to 1,000. Similarly, the mass ratio C1':C2 of the amount C1' of the polyoxyethylene alkyl ether with a polyethylene oxide number of 20 or more and the amount C2 of the polyoxyethylene alkyl ether with an ethylene oxide number of less than 12 is preferably 100:0 to 10,000, more preferably 100:0 to 1,000, and most preferably 100:10 to 1,000.

It is preferable that the aqueous cleaning solution further contains a bactericide in order to further improve the hygienic performance of the wiping sheet. A preferred bactericide is a quaternary ammonium salt. Examples of quaternary ammonium salts include alkyl trimethyl ammonium salts, polyoxyethylene alkyl methyl ammonium salts, alkyl benzyl dimethyl ammonium salts such as benzalkonium chloride, quaternary ammonium salts having a group in which an aryl alkyl group is divided by an ether group, a benzyl group, and two methyl groups, and alkyl pyridinium salts such as alkyl cetyl pyridium chloride. An example of a quaternary ammonium salt having a group in which an aryl alkyl group is divided by an ether group, a benzyl group, and two methyl groups is benzethonium chloride. An example of a group in which an aryl alkyl group is divided by an ether group is a group in which the alkyl chain of the aryl alkyl group is interrupted by an oxygen atom. For example, a general quaternary ammonium salt is represented by the following formula (2).

In the formula, R ¹ 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. R ² represents a linear or branched alkyl group having 1 to 28 carbon atoms, a linear 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 arylalkyl group having 7 to 28 carbon atoms. ^{R 3} and R ⁴ represent the same or different linear or branched alkyl groups having 1 to 3 carbon atoms. However, R ² , R ³ , and R ⁴ may be taken together to form a pyridine ring. ^{A -} represents an anion that is a counterion of an ammonium ion.
A ⁻ may be a carboxylate ion, a sulfonate ion, or a halogen ion, of which a halogen ion is preferred, a chloride ion or a bromide ion is more preferred, and a chloride ion is particularly preferred.

As the quaternary ammonium salt, alkylbenzyldimethylammonium salt is preferred because of its excellent hygienic performance, and benzalkonium chloride is particularly preferred.

The content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.01% by mass or more, more preferably 0.02% by mass or more, and particularly preferably 0.03% by mass or more from the viewpoint of improving the hygienic performance of the aqueous cleaning solution. Also, the content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and particularly preferably 1.0% by mass or less from the viewpoint of safety.
As for the range, the content of the quaternary ammonium salt in the aqueous cleaning liquid is preferably from 0.01% by mass to 5.0% by mass, more preferably from 0.02% by mass to 3.0% by mass, and particularly preferably from 0.03% by mass to 1.0% by mass.

In the present invention, it is also preferable for the aqueous cleaning liquid to contain an antibacterial agent other than the aromatic antibacterial agent in order to further improve the hygienic performance of the wiping sheet.
Antibacterial agents other than aromatic antibacterial agents include glycol compounds. As glycol compounds, those having no aromatic ring and two hydroxyl groups, such as propylene glycol, dipropylene glycol, isoprene glycol, ethylene glycol, butylene glycol, pentylene glycol, 1,2-hexanediol, and 1,2-octanediol, are known. Among them, the use of dipropylene glycol is preferred in terms of further improving hygienic performance.

When a glycol compound used as an antibacterial agent is contained in an aqueous cleaning solution, from the standpoint of enhancing antibacterial performance and ensuring safety, it is preferable that the amount of the glycol compound in the aqueous cleaning solution be 0.01% by mass or more and 1.0% by mass or less, more preferably 0.02% by mass or more and 0.5% by mass or less, and particularly preferably 0.05% by mass or more and 0.3% by mass or less.

As long as the effects of the present invention are achieved, the aqueous cleaning solution may contain, as a surfactant, a cationic surfactant, an anionic surfactant, and/or an amphoteric surfactant in addition to a nonionic surfactant. From the viewpoint of cleaning properties, it is preferable that the aqueous cleaning solution contains only a nonionic surfactant as a surfactant, or contains an amphoteric surfactant in addition to a nonionic surfactant. Examples of the amphoteric surfactant used in the present invention include at least one selected from lauryl dimethylamine oxide, alkyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, etc. When an amphoteric surfactant is contained, the amount of the amphoteric surfactant in the aqueous cleaning solution is preferably 0.01% by mass or more and 0.1% by mass or less.

The aqueous cleaning solution may further contain additives in addition to the above-mentioned components, so long as the effects of the present invention are achieved. Examples of additives include surfactants other than the above-mentioned nonionic surfactants and amphoteric surfactants, bactericides other than alcohols and quaternary ammonium salts, preservatives, fragrances, perfumes, deodorants, pH adjusters, metal sequestering agents, viscosity adjusters, solvents, etc. These may be used alone or in combination. These additives can be used as necessary based on the properties required for the wiping sheet, and the amount of each additive when used can be preferably 0.001% by mass or more and 20% by mass or less in the aqueous cleaning solution.

From the standpoint of hygiene performance and safety, the aqueous cleaning solution of the wiping sheet preferably has a pH of 3.0 or more, more preferably 4.0 or more, and preferably 11.0 or less, more preferably 10.0 or less at 25°C. The pH of the cleaning solution can be adjusted to the above-mentioned range by, for example, adding a pH adjuster to an extent that the effect of the present invention is achieved.

The aqueous cleaning liquid constituting the wiping sheet of the present invention is preferably mainly composed of water. The content of water contained in the aqueous cleaning liquid is preferably 80.0% by mass or more, more preferably 90.0% by mass or more, and is preferably 99.8% by mass or less, more preferably 99.0% by mass or less, based on the total mass of the cleaning liquid.

Next, we will explain the nonwoven fabric that makes up the wiping sheet.

The proportion of the aqueous cleaning liquid impregnated into the nonwoven fabric is preferably 100% by mass or more, and more preferably 200% by mass or more, based on the mass of the nonwoven fabric, from the viewpoint of the amount of liquid transfer to the wiping surface. From the viewpoint of the amount of liquid transfer to the wiping surface, the proportion is preferably 600% by mass or less, and more preferably 500% by mass or less.

Examples of fibers constituting the nonwoven fabric include regenerated fibers, natural fibers, synthetic fibers, etc. From the viewpoints of safety and ease of impregnation and retention of aqueous cleaning liquid, it is preferable that regenerated fibers are included. Examples of regenerated fibers include rayon fibers and acetate fibers, and rayon fibers are preferably used from the viewpoints of safety and versatility. Examples of natural fibers include cotton, hemp, collagen fibers, etc. From the viewpoint of production efficiency, it is preferable that synthetic fibers are composed of fiber-forming resins as raw materials. Examples of such resins include various thermoplastic resins. Examples of thermoplastic resins include polyolefin resins such as polyethylene (PE) and polypropylene (PP), polyester resins such as polyethylene terephthalate (PET), polyamide resins, vinyl resins such as polyvinyl chloride and polystyrene, acrylic resins such as polyacrylic acid and polymethyl methacrylate, fluororesins such as polyperfluoroethylene, etc., and one of these can be used alone or two or more can be used in combination.

From the viewpoint of ease of impregnation and retention of aqueous cleaning liquid, it is preferable that the proportion of recycled fibers in the nonwoven fabric is 1% by mass or more. From this viewpoint, it is particularly preferable that the proportion of recycled fibers in the nonwoven fabric is 5% by mass or more, and even more preferable that the proportion is 10% by mass or more. On the other hand, from the viewpoint of operability during wiping, it is preferable that the proportion of recycled fibers in the nonwoven fabric is 99% by mass or less, and more preferably 90% by mass or less.

From the viewpoint of impregnation with an aqueous cleaning liquid, the mass (g/ ^m2 ) of the regenerated fibers per ^m2 of the nonwoven fabric is preferably 5 g/ ^m2 or more, and more preferably 10 g/ ^m2 or more, when the nonwoven fabric is in a dry state. From the viewpoint of being able to continuously release an appropriate amount of aqueous cleaning liquid during wiping, the mass (g/ ^m2 ) of the regenerated fibers per ^m2 of the nonwoven fabric is preferably 60 g/ ^m2 or less, more preferably 50 g/ ^m2 or less, and even more preferably 40 g/ ^m2 or less.

From the viewpoint of hygienic performance, the ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the regenerated fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.05 or more, more preferably 0.075 or more, and even more preferably 0.01 or more. From the viewpoint of the amount of liquid transfer to the wiping surface and hygienic performance, the ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the regenerated fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 1.0 or less, more preferably 0.6 or less, and even more preferably 0.4 or less.

From the viewpoint of hygienic performance, the ratio of the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the regenerated fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.0002 or more, more preferably 0.0003 or more, and even more preferably 0.0005 or more. From the viewpoint of hygienic performance, the ratio of the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the regenerated fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.005 or less, more preferably 0.003 or less, and even more preferably 0.001 or less.

From the viewpoint of hygienic performance, the ratio of the mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the regenerated fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.0001 or more, more preferably 0.0005 or more, and even more preferably 0.0008 or more. From the viewpoint of hygienic performance, the ratio of the mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the regenerated fibers per ¹ m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.02 or less, more preferably 0.01 or less, and even more preferably 0.007 or less.

From the viewpoint of ease of use during wiping, the fineness of the recycled fibers is preferably 0.5 dtex or more, more preferably 0.75 dtex or more, and even more preferably 1.0 dtex or more, with the upper limit being preferably 3.0 dtex or less, more preferably 2.5 dtex or less, and even more preferably 2.0 dtex or less.

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 even more preferably 80% by mass or less, from the viewpoints of ease of impregnation and retention of aqueous cleaning liquid. On the other hand, the proportion of synthetic fibers in the nonwoven fabric is preferably 5% by mass or more, and more preferably 10% by mass or more, from the viewpoints of operability during wiping and removal of dirt.

From the viewpoint of ease of use during wiping and dirt removal efficiency, the fineness of the synthetic fibers is preferably 0.5 dtex or more, more preferably 1 dtex or more, and even more preferably 1.2 dtex or more, and the upper limit is preferably 4 dtex or less, more preferably 3.5 dtex or less, and even more preferably 3 dtex or less.

In nonwoven fabrics, fibers such as recycled fibers, synthetic fibers, and natural fibers form a fiber aggregate by piling up, entangling, or bonding with each other. The fibers that make up the nonwoven fabric may or may not be fused to each other. The wiping sheet may be composed only of nonwoven fabric, or may include other sheet materials or other components in addition to the nonwoven fabric.

The basis weight of the nonwoven fabric constituting the wiping sheet is preferably 30 g/m ² or more, more preferably 35 g/m ² or more, and even more preferably 40 g/m ² or more in the dry state of the nonwoven fabric, and the upper limit is preferably 100 g/m ² or less, more preferably 90 g/m ² or less, and even more preferably 80 g/m ² or less. The dry state means that the moisture content of the nonwoven fabric is 3 mass% or less. By setting the basis weight of the nonwoven fabric in the dry state in such a range, the wiping sheet can be impregnated with a sufficient amount of aqueous cleaning liquid, thereby exhibiting excellent hygienic performance, being able to absorb a large amount of removed dirt, and further having excellent strength during wiping.

As the nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a spunbond nonwoven fabric, an air-through nonwoven fabric, a resin-bonded nonwoven fabric, a needle-punched nonwoven fabric, etc. can be used. A composite of these nonwoven fabrics may also be used. Among these, a spunlace nonwoven fabric is preferably used from the viewpoint of the ease of entanglement with fibrous debris such as hair and cotton dust.

The nonwoven fabric and the wiping sheet of the present invention having the nonwoven fabric can be, for example, a substantially rectangular sheet having a longitudinal direction and a width direction perpendicular to the longitudinal direction. The wiping sheet may or may not have a macroscopic pattern of concave-convex portions having curved portions on at least one surface.

From the viewpoint of imparting sufficient strength to the wiping sheet during use, the wiping sheet of the present invention may further comprise a scrim net for supporting the nonwoven fabric. It is also preferable that the scrim net is disposed in the central region in the thickness direction of the nonwoven fabric. The scrim net can be integrally entangled with the synthetic fibers constituting the nonwoven fabric, and examples of the scrim net include a mesh-like, lattice-like, and strand-like form.

Resins can be used as raw materials for forming the scrim net. Examples of resins that can be used include 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, and vinylidene resins such as polyvinylidene chloride.

From the viewpoint of achieving both the entanglement of the constituent fibers and the scrim net and the strength of the wiping sheet, the line diameter (diameter in cross section) of the scrim net can be appropriately adjusted according to the degree of entanglement of the fibers, but is preferably 10 μm or more, more preferably 100 μm or more, and preferably 2000 μm or less, and more preferably 1000 μm or less. The line diameter of the scrim net may be partially different or may be the same, and when the line diameter is partially different, the line diameter of the scrim is the average value. In addition, the basis weight of the scrim net is preferably 1 g/m ² or more, more preferably 3 g/m ² or more, preferably 20 g/m ² or less, and more preferably 10 g/m ² or less.

The wiping sheet can be used alone or attached to a cleaning tool such as a wiper to clean floors, walls and other surfaces of buildings, fixtures such as cupboards, window panes, mirrors, doors and doorknobs, rugs, carpets, furniture such as dining tables and desks, kitchens, toilets, wiping the body, as sanitary products, packaging, etc.

In particular, the wiping sheet of the present invention has a nonwoven fabric impregnated with a cleaning solution containing an aromatic antibacterial agent and a nonionic surfactant, so that even after wiping a large area, the deterioration of hygienic performance such as virus removal ability is effectively suppressed. As a result, the wiping sheet of the present invention has excellent hygienic performance, and can achieve effects such as reduced cleaning costs by reducing the number of sheets used and improved cleanliness through cleaning.

Although the present invention has been described based on the preferred embodiment, the present invention is not limited to the above embodiment.
In relation to the above-mentioned embodiment, the present invention further discloses the following wiping sheet.
＜1＞
A wiping sheet having a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric,
The wiping sheet, wherein the aqueous cleaning liquid comprises an aromatic antibacterial agent and a non-ionic surfactant.
＜2＞
The wiping sheet according to <1>, wherein 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, particularly preferably 0.05% by mass or more, and is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, even more preferably 3.0% by mass or less, and particularly preferably 2.0% by mass or less.
＜3＞
The wiping sheet according to <1> or <2>, wherein the nonionic surfactant is a polyoxyethylene alkyl ether.

＜4＞
The wiping sheet according to <3>, wherein the number of ethylene oxide units in the polyoxyethylene alkyl ether is 20 or more.
＜5＞
The polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more;
The wiping sheet according to <3> or <4>, further comprising: the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12.
＜6＞
The amount of the aromatic antibacterial agent in the aqueous cleaning liquid 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. The wiping sheet according to any one of <1> to <3> above.

＜７＞
The wiping sheet according to any one of <1> to <6>, wherein the aromatic antibacterial agent is phenoxyethanol or methylparaben.
＜8＞
The wiping sheet according to any one of <1> to <7>, further comprising a quaternary ammonium salt.
＜9＞
The wiping sheet according to <8>, wherein the quaternary ammonium salt is benzalkonium chloride.
＜10＞
The wiping sheet according to any one of <1> to <9>, further comprising a glycol compound.
<11>
The wiping sheet according to <10>, wherein the amount of the glycol compound in the aqueous cleaning liquid is preferably 0.01% by mass or more and 1.0% by mass or less, more preferably 0.02% by mass or more and 0.5% by mass or less, and particularly preferably 0.05% by mass or more and 0.3% by mass or less.
＜12＞
The wiping sheet according to <10> or <11>, wherein the glycol compound is dipropylene glycol.
＜13＞
The wiping sheet according to any one of <1> to <12>, wherein the nonwoven fabric contains recycled fibers.

＜14＞
The wiping sheet according to <13>, wherein the regenerated fibers are rayon fibers.
＜15＞
The proportion of recycled fibers in the nonwoven fabric is preferably 1 mass% or more, more preferably 5 mass% or more, and even more preferably 10 mass% or more. In addition, the proportion of recycled fibers in the nonwoven fabric is preferably 99 mass% or less, and more preferably 90 mass% or less. The wiping sheet according to any one of <1> to <14> above.
＜16＞
The wiping sheet according to any one of <1> to <15>, wherein the nonwoven fabric has a basis weight of preferably 30 g/ ^m2 or more, more preferably 35 g/ ^m2 or more, and even more preferably 40 g/ ^m2 or ^more , and the nonwoven fabric has a basis weight of preferably 100 g/m2 or less, more preferably 90 g/ ^m2 or ^less , and even more preferably 80 g/m2 or less.

＜１７＞
The mass of the regenerated fibers per 1 ^m2 of the nonwoven fabric is preferably 5 g/ ^m2 or more, more preferably 10 g/ ^m2 or more, and the mass of the regenerated fibers per 1 ^m2 of the nonwoven fabric is preferably 60 g/ ^m2 or less, more preferably 50 g/ ^m2 or less, and even more preferably 40 g/ ^m2 or less. The wiping sheet according to any one of <1> to <16>.
＜18＞
The wiping sheet according to any one of <1> to <17>, wherein the proportion of the aqueous cleaning liquid impregnated into 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, and the proportion of the aqueous cleaning liquid impregnated into the nonwoven fabric is preferably 600% by mass or less, more preferably 500% by mass or less.
＜19＞
The wiping sheet according to any one of <1> to <18>, wherein the ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the recycled fibers per 1 ^m2 of nonwoven fabric (g/ ^m2 ) is preferably 0.05 or more, more preferably 0.075 or more, and even more preferably 0.01 or more, and the ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the recycled fibers per ^{1 m2} of nonwoven fabric (g/m2) is preferably 1.0 or less, more preferably 0.6 or less, and even more preferably 0.4 or less.

＜20＞
The wiping sheet according to any one of <1> to <19>, wherein the ratio of the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1 ^g of nonwoven fabric to the mass of ^the recycled fibers (g/ ^m2 ) per 1 ^m2 of nonwoven fabric is preferably 0.0002 or more, more preferably 0.0003 or more, and even more preferably 0.0005 or more, and the ratio of the mass of the aromatic antibacterial agent in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the recycled fibers (g/m2) per 1 m2 of nonwoven fabric is preferably 0.005 or less, more preferably 0.003 or less, and even more preferably 0.001 or less.
＜21＞
The wiping sheet according to any one of <1> to <20>, wherein the ratio of the mass of the nonionic surfactant in the aqueous cleaning solution per 1 ^g of nonwoven fabric to the mass of the regenerated fibers (g/ ^m2 ) per 1 ^m2 of nonwoven fabric is preferably 0.0001 or more, more preferably 0.0005 or more, and even more preferably 0.0008 or more, and the ratio of the mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the regenerated fibers (g/ ^m2 ) per 1 m2 of nonwoven fabric is preferably 0.02 or less, more preferably 0.01 or less, and even more preferably 0.007 or less.

The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass."

[Examples 1 to 10 and Comparative Examples 1 to 5]
As the nonwoven fabric containing cellulosic fibers, a nonwoven fabric was used that had a scrim net (made of polypropylene, line diameter about 100 μm, basis weight 5 g/ ^m2 ) in the central region in the thickness direction, which was formed by hydroentangling synthetic fibers and fibers containing cellulosic fibers. The fiber composition of the nonwoven fabric was PET fiber (fineness 1.7 dtex): acrylic fiber (fineness 1.0 dtex): rayon fiber (fineness 1.7 dtex) = 70:15:15 in mass ratio, its basis weight in the dry state was 70 g/ ^m2 , and its dimensions were 285 mm × 205 mm.
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 obtain the intended wet wiping sheet.

The aqueous cleaning solution was an aqueous solution containing 0.05% amphoteric surfactant (lauryl dimethylamine oxide), 2% alcohol, 1% solvent (methylpropylene glycol), 0.01% preservative (1,2-benzisothiazolin-3-one), 0.01% metal sequestering agent, and the components listed in Table 1 in the amounts listed in the same table. A pH adjuster was further added to achieve a pH of 9.0. The pH of the cleaning solution at 25°C before impregnation was adjusted using a pH measuring device (HORIBA pH meter F22). The water content of the cleaning solution is 90.0% by mass or more. Note that the amount of each component in Table 1 is not the amount of the formulation but the amount of the active ingredient contained in the formulation.

[Virus removal activity value]
A load of 0.64 kN/ ^m2 was applied to the wet wiping sheets of the examples and comparative examples, and the flooring floor (Combit New Advance 101, manufactured by Wood One Co., Ltd.) was used as the wiping target surface, and 20 tatami mats (equivalent to 32.4 ^m2 ) were continuously wiped at a wiping speed of 1 m/s. The cleanliness of the flooring floor before wiping was made constant by washing with a 70% ethanol aqueous solution and wiping with Kimtowel (registered trademark). The wiping sheets of the examples and comparative examples after wiping were evaluated in accordance with the "Sterilization performance test of wet wipers" established by the Japan Clean Paper and Cotton Industry Association.
Influenza A virus was selected as the virus species. The number of viruses was adjusted to 1.1 x 10 ⁹ /mL. 0.01 mL of the virus preparation was inoculated on a stainless steel plate and spread over an area of 15 mm x 90 mm with a conlarge stick. The plate was wiped using the wiping sheets of the examples and comparative examples after the above wiping. The wiping operation was performed by moving the wiping sheet back and forth over the plate 5 times at intervals of about 2 seconds with a load of 0.78 kN / m ² applied to the wiping sheet. After the wiping operation, the stainless steel plate was left in an environment of 25 ° C. for 5 minutes, and then the wiped area was wiped back and forth with a swab (manufactured by). The swab was impregnated with 1.5 mL of SCDLP liquid medium. Then, the mixture was stirred with a vortex mixer to obtain a virus suspension. The virus suspension obtained by the above operation without wiping with the wiping sheet was used as BLANK.
A 10-fold serial dilution of the virus suspension was prepared using EMEM, and the virus infectivity per 0.1 mL of the virus suspension was measured by plaque assay to calculate the virus infectivity (PFU/stainless steel plate).
The same procedure was carried out using a control sheet, and the common logarithm average of the measured virus infectivity (PFU/stainless steel plate) was calculated. As a control sheet, a Kanakin No. 3 (285 mm x 205 mm) specified in the JIS L0803 attached white cloth for color fastness test was used, which was 150% impregnated with physiological saline in which 0.05% polysorbate 80 was dissolved instead of the cleaning solution. The Kanakin No. 3 had been washed and sterilized in advance by the method specified in the test method.
The virus removal activity was quantified using the following calculation formula. The results are shown in Table 1.
Virus removal activity value = X' - Y'
X': The average common logarithm of the virus infectivity (PFU/stainless steel plate) obtained by performing three trials using the control sheet.
Y': The average common logarithm of the viral infectivity (PFU/stainless steel plate) obtained by performing three trials using the test wiping sheet.
Based on the magnitude of the virus removing activity value calculated by the above formula, the virus removing performance was scored according to the following criteria.
S: ＞4.0
A: 3.5-4.0
B: 2.5-3.4
C: 2.0-2.4
D: 0 to 1.9

From the results shown in Table 1, it can be seen that by adding both a nonionic surfactant and an aromatic antibacterial agent to the aqueous cleaning solution, the virus removal activity value of the wiping sheet after wiping a 20-tatami mat floor is significantly improved. Therefore, it is clear that the wiping sheet of the present invention effectively suppresses the deterioration of the hygienic performance of the wiping target surface from the early stages of wiping, even when the wiping area increases and the amount of cleaning solution released decreases.

According to the present invention, even if the wiping area increases and the amount of cleaning liquid discharged decreases, the deterioration of the hygienic performance of the surface to be wiped is effectively suppressed from the early stage of wiping.

Claims (5)

A wiping sheet having a nonwoven fabric and an aqueous cleaning liquid impregnated in the nonwoven fabric,
the aqueous cleaning solution comprises an aromatic antimicrobial agent, a non- ionic surfactant and a quaternary ammonium salt;
The nonionic surfactant comprises a polyoxyethylene alkyl ether;
The polyoxyethylene alkyl ether is
A polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more;
and a polyoxyethylene alkyl ether having an ethylene oxide number of 8 or more and less than 12,
The wiping sheet, wherein the aromatic antibacterial agent comprises phenoxyethanol and/or methylparaben. The wiping sheet according to claim 1, which is for wiping floors. The wiping sheet according to claim 1 or 2, wherein the content of the nonionic surfactant in the aqueous cleaning liquid is 0.05% by mass or more and 3.0% by mass or less. The wiping sheet according to claim 1 or 2, wherein the amount of the aromatic antibacterial agent in the aqueous cleaning solution is 0.01% by mass or more and 0.3% by mass or less. The wiping sheet according to claim 1 or 2, wherein the proportion of the aqueous cleaning solution impregnated in the nonwoven fabric is 100% by mass or more and 600% by mass or less relative to the mass of the nonwoven fabric.