CN119095529A

CN119095529A - Wiping sheet

Info

Publication number: CN119095529A
Application number: CN202380036679.7A
Authority: CN
Inventors: 百合野翔太郎
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2022-04-27
Filing date: 2023-04-20
Publication date: 2024-12-06
Also published as: JPWO2023210495A1; WO2023210495A1; TW202400068A; JP7568888B2

Abstract

The wiping sheet of the present invention comprises a nonwoven fabric containing cellulose fibers, and an aqueous cleaning solution impregnated in the nonwoven fabric. The aqueous cleaning solution contains quaternary ammonium salt and nonionic surfactant. Preferably, the nonionic surfactant is a polyoxyalkylene alkyl ether. It is also preferable that the number of ethylene oxide in the polyoxyalkylene alkyl ether is 20 or more. It is also preferred that the quaternary ammonium salt is benzalkonium chloride.

Description

Wiping sheet

Technical Field

The present invention relates to a wet wiping sheet.

Background

The wet sheet (cleaning sheet) obtained by impregnating a nonwoven fabric with an aqueous solution containing a degerming agent or the like is relatively simple and easy to use, and can be used for one time, and therefore, a clean sheet can be used all the time, and is used not only in households but also in environmental protection in food factories, kitchens, medical facilities, and the like.

In order to clean the surface of the wiping object, quaternary ammonium salts such as benzalkonium chloride, benzethonium chloride, cetylpyridinium chloride, and the like may be blended into the wet sheet. The base sheet used in the wet sheet generally contains cellulose fibers, and since cellulose is negatively charged, quaternary ammonium salts are easily adsorbed to the cellulose fibers. As a result, the concentration of the quaternary ammonium salt contained in the cleaning liquid released to the wiping target surface is lower than the concentration of the quaternary ammonium salt contained in the cleaning liquid before impregnating the substrate sheet.

In order to prevent the quaternary ammonium salt from adsorbing to the cellulose fiber, patent document 1 proposes to use an anionic surfactant represented by R ₁-COO-X₁ ⁺ or R ₂-O-(CH₂CH₂O)_n-CH₂COO^-X₂ ⁺ in combination with the quaternary ammonium salt.

Patent document 2 proposes the use of an inorganic salt such as aluminum chloride, calcium chloride, and sodium chloride in combination with a quaternary ammonium salt.

Prior art literature

Patent literature

Patent document 1 Japanese patent application laid-open No. 2018-15413

Patent document 2 Japanese patent application laid-open No. 2018-15442

Disclosure of Invention

The present invention relates to a wiping sheet comprising a nonwoven fabric containing cellulose fibers and an aqueous cleaning solution impregnated in the nonwoven fabric.

In one embodiment, the aqueous cleaning solution preferably contains a quaternary ammonium salt and a nonionic surfactant.

Detailed Description

The techniques described in patent documents 1 and 2 can prevent the quaternary ammonium salt from adsorbing to the cellulose-based fibers, but have a problem that the anionic surfactant or the inorganic salt forms a complex with the cationic site of the quaternary ammonium salt, and thus cannot exert a sufficient effect (hygiene) against bacteria or viruses. When the cleaning liquid contains an inorganic salt, a trace of wiping streaks remains on the wiping surface, which causes a problem in workability.

Accordingly, the present invention relates to a wiping sheet which prevents quaternary ammonium salts from adsorbing to cellulose fibers without reducing the hygiene, and which is excellent in hygiene as compared with the prior art.

The present invention will be described below based on preferred embodiments of the present invention.

In the present invention, "wiping" includes both cleaning and wiping, and includes, for example, cleaning of buildings such as floor surfaces, wall surfaces, ceilings, and columns, cleaning of tools or spare parts, wiping of articles, wiping of bodies and tools related to bodies, and the like.

Hereinafter, the aqueous cleaning liquid may be simply referred to as "cleaning liquid".

The present invention relates to a wiping sheet comprising a nonwoven fabric containing cellulose fibers and an aqueous cleaning solution impregnated in the nonwoven fabric. The aqueous cleaning solution contains a quaternary ammonium salt and a nonionic surfactant.

As the quaternary ammonium salt, those having antibacterial and/or antiseptic action have been used conventionally, and examples thereof include alkyltrimethylammonium salts, polyoxyethylene alkylmethylammonium salts, alkylbenzyldimethylammonium salts such as benzalkonium chloride, quaternary ammonium salts having a group wherein an arylalkyl group is blocked with an ether group, benzyl groups and 2 methyl groups, and alkylpyridinium salts such as alkylpyridinium chloride. Examples of quaternary ammonium salts having a group in which an arylalkyl group is blocked by an ether group, a benzyl group and 2 methyl groups include benzethonium chloride. Examples of the group in which the arylalkyl group is interrupted by an ether group include a group in which the alkyl chain of the arylalkyl group is interrupted by an oxygen atom.

For example, as the quaternary ammonium salt, a compound represented by the following general formula (1) can be used.

[ Chemical formula 1]

Wherein 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 wherein 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 wherein 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. R ³ and R ⁴ are the same or different and each represents a straight-chain or branched alkyl group having 1 to 3 carbon atoms. Wherein R ²、R³ and R ⁴ may form a pyridine ring together. A ^- represents an anion as a counter ion for an ammonium ion.

In the general formula (1), a preferable mode of R ¹ is a group in which a linear or branched alkyl group, a linear or branched alkenyl group, or an arylalkyl group is interrupted by an ether group, and a linear alkyl group is particularly preferable from the viewpoint of improving hygienic properties such as sterilization or virus removal of a wiping sheet. In addition, from the same viewpoints as described above, the carbon number of R ¹ is preferably 6 or more and 28 or less, more preferably 8 or more and 18 or less. From the same viewpoints as described above, R ² is preferably an arylalkyl group such as a benzyl group, or R ²、R³ and R ⁴ together form a pyridine ring. In the case where R ²、R³ and R ⁴ do not form a pyridine ring together, the carbon number of R ² is preferably 1 to 28, more preferably 1 to 18, from the same point of view as described above. From the same viewpoints as described above, R ³ and R ⁴ are more preferably 1 to 18.

A ^- is an anion, and examples thereof include carboxylate ion, sulfonate ion and halide ion. Among them, a halogen ion is preferable, a chloride ion and a bromide ion are more preferable, and a chloride ion is particularly preferable.

The quaternary ammonium salt is preferably an alkylbenzyl dimethyl ammonium salt, particularly preferably benzalkonium chloride, from the viewpoint of improving hygienic properties and from the viewpoint of easily forming mixed micelles with a nonionic surfactant (particularly polyoxyethylene alkyl ether).

The content of the quaternary ammonium salt in the aqueous cleaning liquid is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, and particularly preferably 0.02% by mass or more, from the viewpoint of improving the hygienic property or the solubility stability of the aqueous cleaning liquid. The content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.5 mass% or less, more preferably 0.3 mass% or less, and particularly preferably 0.2 mass% or less, in terms of safety.

The content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.005 mass% or more and 0.5 mass% or less, more preferably 0.01 mass% or more and 0.3 mass% or less, and particularly preferably 0.02 mass% or more and 0.2 mass% or less.

The preferable range of the quaternary ammonium salt here is the amount of the aqueous cleaning liquid impregnated into the nonwoven fabric, and the quaternary ammonium salt is preferably within the above ranges in the aqueous cleaning liquid as the squeezed liquid at the time of squeezing after impregnation.

The nonionic surfactant contained in the aqueous cleaning liquid is preferably an alkylene oxide addition nonionic such as ethylene oxide, and particularly preferably a polyoxyalkylene alkyl ether such as polyoxyethylene alkyl ether, in terms of effectively preventing the quaternary ammonium salt from adsorbing to the nonwoven fabric containing cellulose fibers.

Polyoxyethylene alkyl ethers are also known as "alcohol ethoxylates", for example nonionic surfactants obtained by ethoxylating alcohols with ethylene oxide. The present inventors have found that, when a nonwoven fabric containing cellulose fibers such as rayon is impregnated with an aqueous cleaning solution, the quaternary ammonium salt and polyoxyethylene alkyl ether are contained in the aqueous cleaning solution, whereby the quaternary ammonium salt in the aqueous cleaning solution can be effectively prevented from adsorbing to the cellulose fibers. Although the reason why the adsorption of quaternary ammonium salt to cellulose fibers is suppressed by polyoxyethylene alkyl ether is not clear, it is considered that polyoxyethylene alkyl ether effectively forms stable mixed microcells with quaternary ammonium salt due to its structure containing hydrophilic group and hydrophobic group, thereby effectively suppressing the adsorption of cationic sites of quaternary ammonium salt to negatively charged cellulose fiber surfaces. By this effect, the hygienic property due to the use of the quaternary ammonium salt can be effectively exhibited.

The polyoxyethylene alkyl ether is represented by the following general formula (2). In the formula (2), H _2m+1C_m represents the hydrophobic group, and O (CH ₂-CH₂-O)_n) represents the hydrophilic group.

H_2m+1C_mO(CH₂CH₂O)_nH(2)

Wherein m represents an integer of 1 or more, and n represents an integer of 2 or more.

The present inventors have found that the nonionic surfactant, particularly polyoxyethylene alkyl ether having an ethylene oxide number of 10 or more, is particularly effective in preventing adsorption of quaternary ammonium salt to cellulose fibers. In this respect, the polyoxyethylene alkyl ether of the nonionic surfactant preferably has an ethylene oxide number of 15 or more, and more preferably 20 or more.

In addition, the polyoxyethylene alkyl ether preferably has an ethylene oxide number of 50 or less, particularly preferably 30 or less, from the viewpoint of effectively preventing the quaternary ammonium salt from adsorbing to the cellulose-based fibers.

Accordingly, the polyoxyethylene alkyl ether preferably has an ethylene oxide number of 10 to 50, more preferably 15 to 50, particularly preferably 20 to 30.

The number of ethylene oxide is represented by "n" in the above formula (2).

Further, the nonionic surfactant preferably contains 2 or more polyoxyethylene alkyl ethers having different numbers of ethylene oxide. For example, it is preferable to contain a polyoxyethylene alkyl ether having an ethylene oxide number of less than 12 and a polyoxyethylene alkyl ether having an ethylene oxide number of 12 or more. Further, it is preferable that 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 are contained.

However, although the sanitation can be enhanced by using a polyoxyethylene alkyl ether having a small number of addition moles of ethylene oxide (hereinafter, simply referred to as "low EOAE") in combination with a quaternary ammonium salt, the present inventors have made intensive studies and as a result, have found that the effect of preventing adsorption of the quaternary ammonium salt to cellulose fibers by using a low EOAE can be enhanced by using a polyoxyethylene alkyl ether having a large number of addition moles of ethylene oxide (hereinafter, simply referred to as "high EOAE") in addition to the low EOAE and the quaternary ammonium salt. In addition, it is also known that by using three of low EOAE, high EOAE and quaternary ammonium salt in combination, the hygienic property is further improved as compared with the case of using only high EOAE and quaternary ammonium salt.

In view of the above-described significant effects, among polyoxyethylene alkyl ethers having an ethylene oxide number of less than 12, the ethylene oxide number is more preferably 4 or more and less than 12, particularly preferably 8 or more and 11 or less.

The length of the alkyl chain in the polyoxyethylene alkyl ether is preferably 6 to 24, more preferably 9 to 18, in terms of the balance with the number of ethylene oxide, and thus the excellent adsorption-inhibiting effect is more easily exhibited. In the case where the polyoxyethylene alkyl ether contains 2 or more kinds of polyoxyethylene alkyl ethers having different numbers of ethylene oxide, the number of carbon atoms m may be the same or different.

In the case where the quaternary ammonium salt has a long-chain alkyl group having 8 or more carbon atoms, the ratio N/N of the long-chain alkyl group carbon number N to the ethylene oxide number N of the general formula (2) in the polyoxyethylene alkyl ether is preferably in the range of 0.15 or more and 3.0 or less, and more preferably in the range of 0.20 or more and 1.8 or less, in view of easily and effectively suppressing adsorption of the quaternary ammonium salt to the cellulose-based fiber. When 2 or more polyoxyethylene alkyl ethers are used, the number of ethylene oxide in the polyoxyethylene alkyl ether having the largest number of ethylene oxide is defined as the value of n.

In addition, from the same viewpoints as described above, the ratio N/m of the carbon number N of the long-chain alkyl group of the quaternary ammonium salt to the carbon number m of the alkyl group of the polyoxyethylene alkyl ether is preferably 0.25 or more and 3.5 or less, and most preferably 0.75 or more and 1.5 or less. When 2 or more polyoxyethylene alkyl ethers are used, the number of carbons in the alkyl chain of the polyoxyethylene alkyl ether having the largest number of carbons in the alkyl chain is defined as the value of m.

Further, from the same viewpoints as described above, when the number of ethylene oxide is 10 or more, the number of ethylene oxide n of the polyoxyethylene alkyl ether is preferably the number of carbon atoms m or more (n.gtoreq.m) of the alkyl group of the polyoxyethylene alkyl ether.

The content of the nonionic surfactant in the aqueous cleaning liquid is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, and particularly preferably 0.2 mass% or more, from the viewpoint of easily suppressing adsorption of the quaternary ammonium salt in the wiping sheet to the cellulose-based fibers, or from the viewpoint of cleaning power and dissolution stability. The content of the nonionic surfactant in the aqueous cleaning liquid is preferably 5.0 mass% or less, more preferably 4.0 mass% or less, and particularly preferably 3.0 mass% or less, from the viewpoints of workability after wiping (suppression of a slimy feel or foaming), substrate damage prevention property, and safety.

The content of the nonionic surfactant in the aqueous cleaning liquid is preferably 0.01% by mass or more and 5.0% by mass or less, more preferably 0.1% by mass or more and 4.0% by mass or less, and particularly preferably 0.2% by mass or more and 3.0% by mass or less.

When 2 or more nonionic surfactants are used, the content is calculated based on the total amount of all nonionic surfactants.

The ratio a/B of the nonionic surfactant content a (mass%) to the quaternary ammonium salt content B (mass%) in the aqueous cleaning liquid is preferably 1 or more, more preferably 2 or more, and particularly preferably 5 or more, from the viewpoint of improving the effect of inhibiting adsorption of the quaternary ammonium salt to the cellulose-based fibers, and thus the hygienic property and cleaning property. And, it is preferably 100 or less, more preferably 60 or less, and particularly preferably 40 or less. The content is preferably 1 to 100, more preferably 2 to 60, still more preferably 5 to 60, and particularly preferably 5 to 40.

From the same viewpoints as described above, the total of the content a (mass%) of the nonionic surfactant and the content B (mass%) of the quaternary ammonium salt in the aqueous cleaning liquid is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, still more preferably 0.2 mass% or more, and particularly preferably 0.3 mass% or more. The content is preferably 12% by mass or less, more preferably 5% by mass or less, still more preferably 4.5% by mass or less, and particularly preferably 3.5% by mass or less. The content is preferably 0.01% by mass or more and 12% by mass or less, more preferably 0.1% by mass or more and 5% by mass or less, still more preferably 0.2% by mass or more and 4.5% by mass or less, and particularly preferably 0.3% by mass or more and 3.5% by mass or less.

The amount of the nonionic surfactant, particularly polyoxyethylene alkyl ether, in 100 parts by mass of the surfactant contained in the aqueous cleaning liquid is preferably 10 parts by mass or more, more preferably 50 parts by mass or more, from the viewpoint of further improving the effect of inhibiting adsorption of the quaternary ammonium salt to the cellulose-based fibers and improving the cleaning property.

When the nonionic surfactant contains a polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more and a polyoxyethylene alkyl ether having an ethylene oxide number of less than 12, the mass ratio E1:e2 of the amount E1 of the polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more to the amount E2 of the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12 is preferably 100:10 to 900, particularly preferably 100:30 to 300, in terms of more easily obtaining the above significant effects by containing the polyoxyethylene alkyl ether having an ethylene oxide number of 2 or more.

The aqueous cleaning liquid preferably further contains an antibacterial agent in terms of further improving the hygienic property of the wiping sheet. As the antibacterial agent, aromatic antibacterial agents and glycol compounds are suitably used.

The aromatic antibacterial agent includes both an alcohol-based antibacterial agent having an aromatic ring and an antibacterial agent having a structure in which 1 or more hydrogen atoms of an aromatic hydrocarbon core are substituted with hydroxyl groups. Examples of the alcohol-based antibacterial agent having an aromatic ring include benzyl alcohol, phenoxyethanol, phenethyl alcohol, and 3-phenylpropanol. As an antibacterial agent having a structure in which 1 or more hydrogen atoms of an aromatic hydrocarbon core are substituted with hydroxyl groups, p-hydroxybenzoates (also referred to as "paraoxybenzoic ACID ESTER-type"), hinokitiol, 5-chloro-2- (2, 4-dichlorophenoxy) phenol (conventional name: triclosan), 4' -dichloro-2-hydroxydiphenyl ether (conventional name: triclosan), o-benzyl p-chlorophenol (chlorophenol), isopropyl methylphenol (3-methyl-4-isopropylphenol, IPMP), p-chlorom-xylenol (4-chloro-3, 5-dimethylphenol, PCMX), thymol and the like are known. As the parabens, methyl paraben, ethyl paraben and the like are known.

In the present invention, when an aromatic antibacterial agent is used, it is particularly easy to improve the virus-removing effect of the wiping sheet, and among them, phenoxyethanol or parahydroxybenzoates are preferably used, and phenoxyethanol or methylparaben is particularly preferably used.

The diol compound used as the antibacterial agent is a compound having no aromatic ring and having 2 hydroxyl groups, and propylene glycol, dipropylene glycol, isopentyl glycol, butylene glycol, ethylene glycol, 1, 2-pentanediol, 1, 2-hexanediol, 1, 2-octanediol, and the like are known. Among them, dipropylene glycol is preferably used in terms of safety in household articles that a person may use by directly touching with hands.

In view of the above, dipropylene glycol, phenoxyethanol or methylparaben is particularly preferably used as the antibacterial agent in the present invention.

When the aromatic antibacterial agent is contained in the aqueous cleaning solution, 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 terms of easily obtaining the above-described effects due to the use of the aromatic antibacterial agent. The amount of the aromatic antibacterial agent in the aqueous cleaning liquid is preferably 1.0 mass% or less, more preferably 0.8 mass% or less, and particularly preferably 0.5 mass% or less, in terms of suppressing the damage of the substrate on the surface to be wiped.

The amount of the aromatic antibacterial agent in the aqueous cleaning liquid is preferably in the range of 0.01 mass% to 1.0 mass%, more preferably 0.05 mass% to 0.8 mass%, particularly preferably 0.1 mass% to 0.5 mass%.

When the glycol compound used as the antibacterial agent is contained in the aqueous cleaning liquid, the amount of the glycol compound in the aqueous cleaning liquid is preferably 0.005% by mass or more and 5% by mass or less, more preferably 0.01% by mass or more and 1% by mass or less, and particularly preferably 0.05% by mass or more and 0.5% by mass or less, in terms of improvement of antibacterial performance and dissolution stability of the cleaning liquid.

The aqueous cleaning liquid may contain, as a surfactant, a cationic surfactant, an anionic surfactant, and/or an amphoteric surfactant in addition to a nonionic surfactant within a range where the effects of the present invention are exhibited. The aqueous cleaning liquid preferably contains only a nonionic surfactant as a surfactant or contains an amphoteric surfactant in addition to the nonionic surfactant from the viewpoints of adsorption inhibition of quaternary ammonium salt, cleaning property and dissolution stability of the cleaning liquid. The amphoteric surfactant used in the present invention includes, for example, at least one selected from lauryl dimethylamine oxide, alkyl betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolinium betaine, and the like. When the amphoteric surfactant is contained, the amount of the amphoteric surfactant in the aqueous cleaning liquid is preferably 0.01% by mass or more and 0.5% by mass or less.

The aqueous cleaning solution may contain additives in addition to the above components within the range where the effects of the present invention are exhibited. Examples of the additives include surfactants other than the nonionic surfactant and the amphoteric surfactant, bactericides other than alcohols and quaternary ammonium salts, preservatives, fragrances, perfumes, deodorants, pH regulators, metal chelators, viscosity regulators, solvents, and the like. These may be used alone or in combination. These additives may be used as needed based on the properties required for the wiping sheet, and the amounts in the case of use are preferably 0.001 mass% or more and 20 mass% or less in the aqueous cleaning liquid, respectively.

The pH of the aqueous cleaning liquid of the wiping sheet at 25 ℃ is preferably 4 or more, more preferably 5 or more, and further preferably 10 or less, more preferably 9.5 or less, from the viewpoints of hygienic properties, safety, and substrate damage prevention. In order to adjust the pH of the cleaning liquid to the above range, for example, the pH adjustor can be added to the extent that the effect of the present invention is exhibited.

The wiping sheet of the present invention is impregnated with a cleaning liquid mainly composed of water. The content of water contained in the cleaning liquid is preferably 80.0 mass% or more, more preferably 90.0 mass% or more, and further preferably 99.8 mass% or less, more preferably 99.0 mass% or less, relative to the total mass of the cleaning liquid.

Next, a nonwoven fabric containing cellulose fibers will be described.

Examples of the cellulose-based fibers include fibers containing cellulose or derived from cellulose, and the surfaces of the fibers are negatively charged. Examples of the cellulose fibers include rayon fibers, cuprammonium rayon fibers, lyocell fibers, acetate fibers, high-wet-modulus viscose fibers, pulp fibers, cotton fibers, and the like. These cellulose fibers may be used in 1 kind, or in combination. Among them, the nonwoven fabric used in the present invention preferably contains rayon fibers as cellulose fibers, in terms of the retention of the cleaning liquid or the uniformity of the wetting and spreading of the cleaning liquid on the entire sheet during storage.

The proportion of the cellulose fiber in the nonwoven fabric is preferably 1% by mass or more, in terms of excellent effect by using the specific surfactant of the present invention. From this viewpoint, the proportion of the cellulose-based fibers in the nonwoven fabric is particularly preferably 5% by mass or more, and still more preferably 10% by mass or more. On the other hand, the proportion of the cellulose fibers in the nonwoven fabric is not limited to an upper limit, and may be, for example, 100 mass% or less.

The fineness of the cellulose fiber is preferably 0.5dtex or more, more preferably 0.75dtex or more, further preferably 1.0dtex or more, and the upper limit thereof is preferably 3.0dtex or less, more preferably 2.5dtex or less, further preferably 2.0dtex or less, from the viewpoints of the retention of the cleaning liquid and the operability (low wiping resistance) during wiping.

The nonwoven fabric may contain fibers other than cellulose-based fibers. As the fibers other than cellulose-based fibers, synthetic fibers may be mentioned. From the viewpoint of production efficiency, the synthetic fibers are preferably formed from a fiber-forming resin as a raw material. Examples of such resins include various thermoplastic resins. Examples of the thermoplastic resin 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, and fluororesins such as polyperfluoroethylene, and one kind or two or more kinds of these resins may be used singly or in combination.

The fineness of the synthetic fiber is preferably 0.5dtex or more, more preferably 1dtex or more, further preferably 1.2dtex or more, and the upper limit thereof is preferably 4dtex or less, more preferably 3.5dtex or less, further preferably 3dtex or less, from the viewpoints of workability at wiping and stain removal efficiency.

When the nonwoven fabric contains synthetic fibers, the amount of the synthetic fibers in the nonwoven fabric is particularly preferably 95 mass% or less, and even more preferably 90 mass% or less, in terms of the suitability for wiping, and the workability in wiping, and the stain removal. On the other hand, the proportion of the synthetic fibers in the nonwoven fabric is preferably 10 mass% or more, more preferably 20 mass% or more, in terms of the retention of the cleaning liquid and the workability at the time of wiping.

In the nonwoven fabric, fibers such as cellulose fibers and synthetic fibers are stacked on each other, entangled with each other, or bonded to each other to form a fiber assembly. The fibers constituting the nonwoven fabric may be fused to each other or may not be fused. The wiping sheet may be composed of only nonwoven fabric, or may be provided with other sheet materials or other members in addition to nonwoven fabric.

The weight per unit area of the nonwoven fabric constituting the wiping sheet is preferably 30g/m ² or more, more preferably 35g/m ² or more, still more preferably 40g/m ² or more, and the upper limit thereof is preferably 100g/m ² or less, more preferably 90g/m ² or less, still more preferably 80g/m ² or less in the dry state of the nonwoven fabric. The dry state means that the moisture content in the nonwoven fabric is 3 mass% or less. When the weight per unit area of the nonwoven fabric in the dry state is in such a range, the wiping sheet can be impregnated with a sufficient amount of the aqueous cleaning liquid, so that excellent hygienic performance can be exhibited, a large amount of removed stains can be absorbed, and further the strength at the time of wiping is excellent.

As the nonwoven fabric, there may be used a spunlaced nonwoven fabric, a melt-blown nonwoven fabric, a spun-bonded nonwoven fabric, a hot air nonwoven fabric, a resin bonded nonwoven fabric, a needle punched nonwoven fabric, etc. In addition, a composite of these nonwoven fabrics may be used. Among these, the spunlaced nonwoven fabric is preferably used from the viewpoint of being easily entangled with fibrous dirt such as hair and cotton wool.

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

The wiping sheet of the present invention may further comprise a scrim for supporting the nonwoven fabric from the viewpoint of imparting sufficient strength when the wiping sheet is used. The scrim is also preferably disposed in the central region in the thickness direction of the nonwoven fabric. The scrim is a nonwoven fabric that can be entangled with synthetic fibers, and examples thereof include a mesh, a lattice, and a thread.

As a raw material for forming the scrim, a resin may be used. Examples of the resin 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.

The thread diameter (diameter of cross section) of the thin gauze can be appropriately adjusted according to the degree of entanglement of the fibers, from the viewpoint of both the entanglement of the constituent fibers with the thin gauze and the strength of the wiping sheet, and is preferably 10 μm or more, more preferably 100 μm or more, and preferably 2000 μm or less, and still more preferably 1000 μm or less. The yarn diameters of the scrim may be partially different or the same, and if the yarn diameters are partially different, the yarn diameters of the scrim may be the average value. The weight per unit area of the scrim is preferably 1g/m ² or more, more preferably 3g/m ² or more, and preferably 20g/m ² or less, more preferably 10g/m ² or less.

The proportion of the aqueous cleaning liquid impregnated in the nonwoven fabric is preferably 50 mass% or more, more preferably 100 mass% or more, and preferably 800 mass% or less, more preferably 600 mass% or less, relative to the mass of the nonwoven fabric, from the viewpoint of exhibiting the stain removing function.

From the viewpoint of the impregnation property of the aqueous cleaning solution in the nonwoven fabric, the mass (g/m ²) of the cellulose-based fibers per 1m ² of the nonwoven fabric is preferably 5g/m ² or more, more preferably 10g/m ² or more in the dry state of the nonwoven fabric. The mass (g/m ²) of the cellulose-based fibers in the nonwoven fabric per 1m ² is preferably 60g/m ² or less, more preferably 50g/m ² or less, and even more preferably 40g/m ² or less, from the viewpoint of continuously releasing an appropriate amount of the aqueous cleaning solution during wiping.

From the viewpoint of the impregnation property of the aqueous cleaning liquid, the ratio of the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.005 or more, more preferably 0.01 or more, and still more preferably 0.05 or more. The ratio of the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric to the mass of the cellulose-based fiber per 1m ² of the nonwoven fabric (g/m ²) is preferably 1.0 or less, more preferably 0.8 or less, and even more preferably 0.5 or less, from the viewpoint of continuously releasing an appropriate amount of the cleaning liquid at the time of wiping.

From the viewpoint of hygienic properties, the ratio of the mass of the quaternary ammonium salt in the aqueous cleaning solution per 1g of the nonwoven fabric to the mass of the cellulose-based fiber per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.00001 or more, more preferably 0.00005 or more, and still more preferably 0.0001 or more. From the viewpoint of workability after wiping, the ratio of the mass of the quaternary ammonium salt per 1g of the aqueous cleaning solution to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.001 or less, more preferably 0.0005 or less, and even more preferably 0.00035 or less.

From the viewpoints of the oil stain removing effect and the inhibition of adsorption of the quaternary ammonium salt to the fibers, the ratio of the mass of the nonionic surfactant per 1g of the aqueous cleaning liquid to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.00005 or more, more preferably 0.0001 or more, and still more preferably 0.0002 or more. From the viewpoints of hygienic performance and workability after wiping, the ratio of the mass of the nonionic surfactant per 1g of the aqueous cleaning liquid to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.04 or less, more preferably 0.02 or less, and still more preferably 0.01 or less.

The wiping sheet may be used alone or attached to a cleaning tool such as a scraper for buildings such as floor surfaces and wall surfaces, a building tool such as a cabinet, window glass, a mirror, a door handle, furniture such as a mat, a carpet, a table, a kitchen, a toilet, a body cleaning, a sanitary product, a package, and the like.

In particular, the wiping sheet of the present invention is effective in suppressing adsorption of quaternary ammonium salt to cellulose fibers in a nonwoven fabric because the nonwoven fabric containing cellulose fibers is impregnated with a cleaning liquid containing quaternary ammonium salt and a nonionic surfactant. Thus, more quaternary ammonium salt is liable to remain in the squeezed liquid squeezed during wiping with the wiping sheet of the present invention or on the wiping target surface after wiping, and the antibacterial, antiviral, antibacterial and antiviral effects of the quaternary ammonium salt can be effectively exhibited, and the hygienic performance is excellent.

The present invention has been described above based on preferred embodiments thereof, but the present invention is not limited to the above embodiments.

With respect to the above embodiments, the present invention also discloses the following wiping sheet.

<1>

A wiping sheet comprising a nonwoven fabric containing cellulose fibers and an aqueous cleaning liquid impregnated in the nonwoven fabric

The aqueous cleaning solution contains quaternary ammonium salt and nonionic surfactant.

<2>

The wiping sheet according to item <1>, wherein, when the content of the nonionic surfactant in the aqueous cleaning solution is A (mass%) and the content of the quaternary ammonium salt is B (mass%), A+B is 0.01 mass% or more, preferably 0.1 mass% or more, more preferably 0.2 mass% or more, particularly preferably 0.3 mass% or more, and 12 mass% or less, preferably 5 mass% or less, more preferably 4.5 mass% or less, and particularly preferably 3.5 mass% or less.

<3>

The wiping sheet according to the above item <1> or <2>, wherein the ratio A/B is preferably 1 or more, more preferably 2 or more, particularly preferably 5 or more, and preferably 100 or less, more preferably 60 or less, particularly preferably 40 or less, when the content of the nonionic surfactant in the aqueous cleaning liquid is A (mass%) and the content of the quaternary ammonium salt is B (mass%).

<4>

The wiping sheet as defined in any one of the above <1> to <3>, wherein the nonionic surfactant is a polyoxyalkylene alkyl ether.

<5>

The wiping sheet according to any one of the above items <1> to <4>, wherein the polyoxyalkylene alkyl ether is preferably 10 parts by mass or more, and more preferably 50 parts by mass or more, based on 100 parts by mass of the surfactant contained in the aqueous cleaning solution.

<6>

The wiping sheet according to the item <4> or <5>, wherein the polyoxyalkylene alkyl ether has an ethylene oxide number of 20 or more.

<7>

The wiping sheet according to the above <4> or <5>, which comprises the polyoxyalkylene alkyl ether having an ethylene oxide number of 20 or more and the polyoxyalkylene alkyl ether having an ethylene oxide number of less than 12.

<8>

The wiping sheet of item <7> above, wherein the mass ratio of the polyoxyalkylene alkyl ether having an ethylene oxide number of 20 or more to the polyoxyalkylene alkyl ether having an ethylene oxide number of less than 12 is preferably 100:10 to 900, particularly preferably 100:30 to 300.

<9>

The wiping sheet as defined in any one of <1> to <8>, wherein the quaternary ammonium salt is benzalkonium chloride.

<10>

The wiping sheet according to any one of <1> to <9>, which further comprises an aromatic antibacterial agent.

<11>

The wiping sheet according to item <10>, wherein 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, particularly preferably 0.1 mass% or more, and the amount of the aromatic antibacterial agent is preferably 1.0 mass% or less, more preferably 0.8 mass% or less, particularly preferably 0.5 mass% or less.

<12>

The wiping sheet according to the item <10> or <11>, wherein the aromatic antibacterial agent is phenoxyethanol or methylparaben.

<13>

The wiping sheet as defined in any one of <1> to <12>, which further comprises dipropylene glycol, phenoxyethanol or methylparaben.

<14>

The wiping sheet according to any one of the above items <1> to <13>, wherein the cellulose-based fiber contained in the nonwoven fabric is 1 mass% or more.

<15>

The wiping sheet according to any one of the above items <1> to <14>, wherein the cellulose-based fibers are rayon fibers.

<16>

The wiping sheet according to any one of the above items <1> to <15>, wherein the cellulose-based fibers are preferably 5 mass% or more, more preferably 10 mass% or more and 100 mass% or less in the nonwoven fabric.

<17>

The wiping sheet according to any one of the above items <1> to <16>, wherein the nonwoven fabric has a weight per unit area of preferably 30g/m ² or more, more preferably 35g/m ² or more, still more preferably 40g/m ² or more, and the nonwoven fabric has a weight per unit area of preferably 100g/m ² or less, more preferably 90g/m ² or less, still more preferably 80g/m ² or less.

<18>

The wiping sheet according to any one of the above items <1> to <17>, wherein the mass of the cellulose-based fibers of the nonwoven fabric per 1m ² is preferably 5g/m ² or more, more preferably 10g/m ² or more, and the mass of the cellulose-based fibers of the nonwoven fabric per 1m ² is preferably 60g/m ² or less, more preferably 50g/m ² or less, still more preferably 40g/m ² or less.

<19>

The wiping sheet according to any one of the above items <1> to <18>, wherein the proportion of the aqueous cleaning liquid impregnated in the nonwoven fabric is preferably 50 mass% or more, more preferably 100 mass% or more, relative to the mass of the nonwoven fabric, and the proportion of the aqueous cleaning liquid impregnated in the nonwoven fabric is preferably 800 mass% or less, more preferably 600 mass% or less, relative to the mass of the nonwoven fabric.

<20>

The wiping sheet according to any one of the above items <1> to <19>, wherein the content of the nonionic surfactant in the aqueous cleaning liquid is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, further preferably 0.2 mass% or more, and the content of the nonionic surfactant in the aqueous cleaning liquid is preferably 5.0 mass% or less, more preferably 4.0 mass% or less, further preferably 3.0 mass% or less.

<21>

The wiping sheet according to any one of the above items <1> to <20>, wherein the content of the quaternary ammonium salt in the aqueous cleaning liquid is preferably 0.005% by mass or more, more preferably 0.01% by mass or more, further preferably 0.02% by mass or more, and the content of the quaternary ammonium salt in the aqueous cleaning liquid is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, further preferably 0.2% by mass or less.

<22>

The wiping sheet according to any one of the above items <1> to <21>, wherein the ratio of the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.005 or more, more preferably 0.01 or more, still more preferably 0.05 or more, and the ratio of the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 1.0 or less, more preferably 0.8 or less, still more preferably 0.5 or less.

<23>

The wiping sheet according to any one of the above items <1> to <22>, wherein the ratio of the mass of the quaternary ammonium salt in the aqueous cleaning solution per 1g of the nonwoven fabric to the mass (g/m ²) of the cellulose-based fibers per 1m ² of the nonwoven fabric is preferably 0.00001 or more, more preferably 0.00005 or more, still more preferably 0.0001 or more, and the ratio of the mass of the quaternary ammonium salt in the aqueous cleaning solution per 1g of the nonwoven fabric to the mass (g/m ²) of the cellulose-based fibers per 1m ² of the nonwoven fabric is preferably 0.001 or less, more preferably 0.0005 or less, still more preferably 0.00035 or less.

<24>

The wiping sheet according to any one of the above items <1> to <23>, wherein the ratio of the mass of the nonionic surfactant per 1g of the aqueous cleaning solution to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.00005 or more, more preferably 0.0001 or more preferably 0.0002 or more, and the ratio of the mass of the nonionic surfactant per 1g of the aqueous cleaning solution to the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric (g/m ²) is preferably 0.04 or less, more preferably 0.02 or less, more preferably 0.01 or less.

Examples

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to these examples.

Example 1 and comparative example 1

A spun-laced nonwoven fabric was used as the nonwoven fabric. The aqueous cleaning solution having the composition described in table 1 was impregnated at a ratio of 400 mass% to the mass of the spun-laced nonwoven fabric, and was held in a polyethylene bag at 25 ° CC for 1 week in a state in which 5 sheets were laminated in a cross-folded state. Then, the press was performed using a table-top mangle roll to obtain a press liquid. The concentration of the quaternary ammonium salt in the obtained squeezed liquid was quantified by a liquid chromatography device (Agilent 1200 manufactured by Agilent corporation). The adsorption inhibition ability was scored by calculating the adsorption rate and adsorption inhibition rate based on the concentration C1 of the quaternary ammonium salt in the aqueous cleaning liquid and the concentration C2 of the quaternary ammonium salt in the press liquid according to the following formulas. The ratio of the cleaning liquid shown in table 1 is the amount of the active ingredient contained in the preparation, not the amount of the preparation.

The nonwoven fabric was a spun-laced nonwoven fabric having a commercial number NW-RH3-55BS manufactured by Dacron and textile Co. The nonwoven fabric had a size of 150 mm. Times.240 mm, a weight per unit area of 50g/m ², and a blend ratio of rayon fibers of 80 mass%. The blend ratio of the PP/PE composite fiber as the synthetic fiber was 20% by mass.

Adsorption rate=c2/C1

Adsorption inhibition=1- { adsorption rate/adsorption rate of comparative example 1 (75%)

4 Minutes, adsorption inhibition rate is more than 45 percent

3 Minutes, the adsorption inhibition rate is 35-44 percent

2 Minutes, the adsorption inhibition rate is 20-34 percent

1 Part, the adsorption inhibition rate is 0-19 percent

TABLE 1

	Example 1	Comparative example 1
			Nonionic activator 1 (mass%)	1	-
Quaternary ammonium salt ² (mass%)	0.1	0.1
			Amphoteric active agent ³ (mass%)	-	-
Water and its preparation method	Allowance of	Allowance of
			Evaluation of adsorption inhibition ability	2	1

* Emulgen 109P (polyoxyethylene alkyl ether, n=9, m=12, manufactured by Kao corporation)

* SAN ISOL B-50 (alkyl benzyl dimethyl ammonium chloride manufactured by Kao corporation)

* Amphitol 20N (lauryl dimethyl amine oxide, manufactured by Kao corporation)

Examples 2 to 6

Examples 2 to 6 were obtained by changing the number of ethylene oxide of the polyoxyethylene alkyl ether in example 1 to 4 (example 2), 12 (example 3), 19 (example 4), 23 (example 5), and 47 (example 6), respectively. Except for this, the adsorption inhibition ability of the quaternary ammonium salt was evaluated in the same manner as in example 1. The results are shown in table 2.

TABLE 2

	Example 2	Example 3	Example 4	Example 5	Example 6
						Number of ethylene oxide	4	12	19	23	47
Evaluation of adsorption inhibition ability	2	3	4	4	4

Examples 7 to 18 and comparative examples 2 to 5

As the nonwoven fabric containing cellulose fibers, a nonwoven fabric was used which was spun-laced with synthetic fibers and fibers containing cellulose fibers and which had a scrim (made of polypropylene, wire diameter of about 100 μm, weight per unit area of 5g/m ²) in the central region in the thickness direction. The nonwoven fabric had a fiber composition comprising PET fibers (fineness: 1.7 dtex), acrylic fibers (fineness: 1.0 dtex), rayon fibers (fineness: 1.7 dtex) =70:15:15 in a mass ratio of 70g/m ² per unit area weight in a dry state, and had a size of 285mm×205mm.

The nonwoven fabric was impregnated with 350 mass% of the cleaning liquid to prepare a target wet wipe sheet.

The cleaning solution was prepared as an aqueous solution containing 0.05 mass% of an amphoteric surfactant (lauryl dimethyl amine oxide), 2 mass% of an alcohol, 1 mass% of a solvent (methyl propylene glycol), 0.01 mass% of a preservative (1, 2-benzisothiazolin-3-one), and 0.01 mass% of a metal chelating agent, and the components described in Table 3 were contained in the amounts described in the foregoing tables. The pH regulator is also contained in a manner of pH value of 9.0. The pH of the cleaning liquid before impregnation was adjusted at 25 ℃ using a pH measuring device (manufactured by HORIBA corporation, pH meter F22). The water content in the cleaning liquid is 90.0% by mass or more.

[ Value of degerming Activity (expressed liquid) ]

After impregnating the nonwoven fabric with the cleaning solution, 5 sheets were laminated in a polyethylene bag at 25 ℃ and held for 1 week. Thereafter, the nonwoven fabric was pressed by the operation of a table-top mangle roll to obtain a pressed liquid (squeezed liquid). The obtained squeeze liquid was subjected to a sterilization test. The test was conducted according to the method for testing the antibacterial activity of the synthetic detergent and soap for house prescribed by the detergent/soap fair trade company. Coli and staphylococcus aureus were used in the test. The test bacterial liquid was coated on a stainless steel test piece, the test sample was coated thereon, and then left to stand for 5 minutes, and then the test piece was administered into a deactivator (LP (Lecithin polysorbate, lecithin polysorbate) dilution) in a sample bottle. Thereafter, bacteria were extracted from the sample bottles, cultured under predetermined conditions, and the surviving bacteria were measured. The sterilization activity value is calculated using the following formula. The results are shown in table 3. The results of examples 1 and 5 are also shown in the table. An aqueous solution of polysorbate 80 at 0.05w/v% was sterilized and used as a control sample.

Calculation method for calculating the value of the activity of sterilization

Degerming activity value = X-Y

X mean value of 3 common logarithmic values of bacterial count in case of contact with control sample

Y average of 3 common logarithmic values of the number of bacteria in contact with the test specimen

Performance was scored by the magnitude of the sterilization activity value.

4 Minutes, more than 3.5

3 Min, more than 2.5 and less than 3.5

2 Min, more than 2.0 and less than 2.5

1 Min, more than 0 and less than 2.0

[ Antibacterial Activity value ]

Using the wet wiping sheets of examples and comparative examples, a load of 0.64kN/m ² was applied to a stainless steel plate having a square width of 5cm, and wiping was performed. The obtained stainless steel sheet subjected to surface treatment was subjected to an antibacterial test. The test was carried out according to the test method specified in JIS Z2801:2010 (ISO 22196:2007). Coli and staphylococcus aureus were used in the test. The bacterial cells were dropped onto the 5cm square test piece (antimicrobial processed product and unprocessed product), covered with a 4cm square film, and cultured at a temperature of 35.+ -. 1 ℃ and a relative humidity of 90% or more for 24 hours. After the incubation, the test bacteria on the test piece were washed off and recovered, and the number of bacteria per 1cm ² was measured. The antibacterial activity value is calculated using the following formula. The results are shown in table 3. The results of examples 1 and 5 are also shown in the table. The raw stainless steel plate was sterilized and used as a control sample.

Method for calculating antibacterial Activity value

Antibacterial activity value = X '-Y'

X': average of 3 common log values per 1cm ² of viable count after 24 hours of control sample

Y': average of 3 common log values of number of viable bacteria per 1cm ² after 24 hours of wiping the processed sample

Performance was scored by the magnitude of the antimicrobial activity value.

4 Minutes, more than 3.5

3 Min, more than 2.5 and less than 3.5

2 Min, more than 2.0 and less than 2.5

1 Min, more than 0 and less than 2.0

[ Viral Activity value ]

The wet wiping sheets of examples and comparative examples were subjected to a load of 0.64kN/m ², and 20 sheets (corresponding to 32.4m ²) were continuously wiped at a wiping speed of 1m/s with a floor laying (Combit NEW ADVANCE, manufactured by WOOD ONE Co.) as a wiping target surface. The cleanability of the floor laid before wiping was kept constant by washing with a 70% aqueous ethanol solution and wiping with Kimtowel (registered trademark). The wiping sheets of examples and comparative examples after wiping were evaluated according to the "test for the sterilization performance of wet wipes" specified by the japanese cleaning paper and cotton industry.

Influenza a virus was selected as the virus species. The number of viruses was prepared at 1.1X10 ⁹/mL, respectively. 0.01mL of the virus preparation was inoculated onto a stainless steel plate, and spread to a range of 15mm by 90mm using a cell spreader. The above-described wiping sheet of the example and comparative example after wiping was used to wipe the board. The wiping operation was performed back and forth on the plate 5 times at about 2 second intervals with a load of 0.78kN/m ² applied to the wiping sheet. After the wiping operation was completed, the stainless steel plate was left to stand at 25 ℃ for 5 minutes, and thereafter, the wiping part was wiped back and forth 10 times with a wiper (made). The wipes were pre-impregnated with 1.5mL of SCDLP (soy CASEIN DIGEST LECITHIN Polysorbate ) liquid medium. Then, the suspension was stirred by a vortex mixer to obtain a virus suspension. In addition, a virus suspension obtained by the above-described operation without wiping operation with a wiping sheet was used as a blank sample.

A10-fold dilution series of the virus suspension was prepared using EMEM (Eagle's Minimum Essential Medium, minimum essential medium of Eagl), and virus infection titer was measured per 0.1mL of the virus suspension by a plaque assay to calculate virus infection titer (PFU (Plaque forming unit, plaque forming unit)/stainless steel plate).

In addition, the average of the common logarithm of the measured virus infection titers (PFU/stainless steel plate) was determined using a control sheet, operating in the same manner. In addition, a fine white cloth No. 3 (285 mm×205 mm) defined by JIS L0803 color fastness test accompanying white cloth was impregnated with a physiological saline solution in which 0.05% polysorbate 80 was dissolved in place of 150% of the cleaning solution, and the resultant was used as a control sheet. The fine white cloth No. 3 is preliminarily subjected to a cleaning and sterilizing treatment by a method prescribed by a test method.

The virus removal activity value was numerically calculated according to the following calculation formula. The results are shown in table 3. The results of examples 1 and 5 are also shown in the table.

Viral removal activity value = X "-Y'

X ": average of common log values of virus infection titers (PFU/stainless steel plate) in the results of 3 trial and error through control sheets.

Y ": average of common logarithmic values of virus infection titer (PFU/stainless steel plate) in the results of 3 repeated trials by wiping sheet as test subject.

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

4 Minutes, more than 3.5

3 Min, more than 2.5 and less than 3.5

2 Min, more than 2.0 and less than 2.5

1 Min less than 2.0

[ Oil stain cleaning ability ]

0.4G of coloured oleic acid was applied to the surface of a wiping object of a laid-down floor having dimensions 700mm by 300 mm. The number of rounds at which oleic acid can be removed at this time was counted by wiping with the wiping sheet at the upper limit of 10 rounds in the longitudinal direction of the floor. The wiping conditions were set to a load of 0.64kN/m ² and a speed of 1 m/sec. The number of round trips required until degreasing is scored. The results are shown in table 3. The results of examples 1 and 5 are also shown in the table.

4 Minutes, can be removed within 5 times of round trip

3 Minutes, can be removed within 6-9 times of round trip

2 Minutes 10 passes with slight wiping residue

1 Minute 10 passes most of the wiping residue was present

[ Comprehensive evaluation ]

The comprehensive evaluation is to calculate an average value of scores of all evaluation items, and to classify the items according to the following criteria. In the case where 1 score exists in the evaluation item, the score is designated as class D regardless of the average score.

A ⁺ the average score was 4.0 minutes.

The average score A is more than 3.5 and less than 4.0.

And B, the average division is more than 3.0 minutes and less than 3.5 minutes.

The average division of C is more than 2.0 minutes and less than 3.0 minutes.

And D, the average score is less than 2.0 points or 1 point in any one of the evaluation items.

TABLE 3

From the results shown in tables 1 to 3, it is found that adsorption of quaternary ammonium salt to cellulose fibers can be suppressed by nonionic surfactants such as polyoxyethylene alkyl ether, as compared with the case of using conventional surfactants. Further, it is known that the addition of polyoxyethylene alkyl ether to an aqueous cleaning liquid in a wiping sheet comprising a nonwoven fabric containing cellulose fibers and an aqueous cleaning liquid containing a quaternary ammonium salt provides excellent antibacterial, antiseptic and antiviral effects to the squeezed liquid of the wiping sheet.

Industrial applicability

According to the wiping sheet of the present invention, the quaternary ammonium salt is prevented from adsorbing to the cellulose fibers without reducing the hygiene, and therefore a sufficient amount of quaternary ammonium salt is supplied to the wiping surface, and the hygiene of the wiping surface is excellent.

Claims

1. A wiping sheet comprising a nonwoven fabric containing cellulose fibers, and an aqueous cleaning solution impregnated in the nonwoven fabric, wherein the cleaning sheet is provided with a cleaning agent

2. The wiping sheet according to claim 1, wherein a+b is 0.01 mass% or more and 12 mass% or less, when the content of the nonionic surfactant contained in the aqueous cleaning liquid is a and the unit is mass%, and the content of the quaternary ammonium salt is B and the unit is mass%.

3. The wiping sheet according to claim 1 or 2, wherein a/B is 1 or more and 100 or less when the content of the nonionic surfactant contained in the aqueous cleaning liquid is a and the unit is mass% and the content of the quaternary ammonium salt is B and the unit is mass%.

4. The wiping sheet according to any one of claims 1 to 3, wherein the nonionic surfactant is a polyoxyalkylene alkyl ether.

5. The wiping sheet of claim 4, wherein the polyoxyalkylene alkyl ether is a polyoxyethylene alkyl ether,

The number of ethylene oxide in the polyoxyethylene alkyl ether is 15 or more.

6. The wiping sheet according to claim 4, which contains:

the polyoxyethylene alkyl ether having an ethylene oxide number of 20 or more, and a process for producing the same

The polyoxyethylene alkyl ether having an ethylene oxide number of less than 12.

7. The wiping sheet of any one of claims 1-6, wherein the quaternary ammonium salt is benzalkonium chloride.

8. The wiping sheet according to any one of claims 1 to 7, further comprising dipropylene glycol, phenoxyethanol, or methylparaben.

9. The wiping sheet according to any one of claims 1 to 8, wherein the mass of the cellulose-based fibers per 1m ² of the nonwoven fabric is 5g/m ² or more and 60g/m ² or less.

10. The wiping sheet according to any one of claims 1 to 9, wherein the ratio of the aqueous cleaning liquid impregnated in the nonwoven fabric is 50 mass% or more and 800 mass% or less relative to the mass of the nonwoven fabric.

11. The wiping sheet according to any one of claims 1 to 10, wherein the ratio of the mass of the aqueous cleaning liquid per 1g of the nonwoven fabric to the mass of the cellulose-based fiber per 1m ² of the nonwoven fabric in g/m ² is 0.005 or more and 1.0 or less.

12. The wiping sheet according to any one of claims 1 to 11, wherein the ratio of the mass of the quaternary ammonium salt per 1g of the aqueous cleaning liquid to the mass of the cellulose-based fiber per 1m ² of the nonwoven fabric in g/m ² is 0.00001 or more and 0.001 or less.

13. The wiping sheet according to any one of claims 1 to 12, wherein the ratio of the mass of the nonionic surfactant per 1g of the aqueous cleaning liquid to the mass of the cellulose-based fiber per 1m ² of the nonwoven fabric in g/m ² is 0.00005 or more and 0.04 or less.