แผ่นเช็ดทำความสะอาด

Abstract

DEPCT67 สิ่งที่ถูกจัดให้มีไว้คือแผ่นเช็ดทำความสะอาดที่รวมถึงผ้าไม่ถักไม่ทอที่ประกอบด้วยเส้นใย เซลลูโลสและของเหลวสำหรับการทำความสะอาดที่ประกอบด้วยน้ำที่ถูกทำให้ซึมทะลุเข้าไป ในผ้าไม่ถักไม่ทอของเหลวสำหรับการทำความสะอาดที่ประกอบด้วยน้ำประกอบด้วยเกลือ แอมโมเนียมชนิดจตุรภูมิและสารลดแรงตึงผิวชนิดไม่มีประจุสารลดแรงตึงผิวชนิดไม่มีประจุ อย่างพึงประสงค์คือพอลิออกซีแอลคิลีนแอลคิลอีเทอร์พอลิออกซีแอลคิลีนแอลคิลอีเทอร์อย่างพึง ประสงค์มีจำนวนเอทิลีนออกไซด์20ตัวหรือมากกว่านั้นเกลือแอมโมเนียมชนิดจตุรภูมิอย่างพึง ประสงค์คือเบนซาลโคเนียมคลอไรด์;

Description

Wiping Sheet

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

[0002] Wet sheets (cleaning sheets) are nonwoven fabrics impregnated with an aqueous solution containing a disinfectant or the like. They are simple, easy to use, and disposable, allowing them to be kept clean at all times. As a result, they are used not only in the home but also in environmental maintenance in food factories, kitchens, and medical facilities.

[0003] Wet wipes are sometimes formulated with quaternary ammonium salts, such as benzalkonium chloride, benzethonium chloride, and cetylpyridinium chloride, to clean the surface being wiped. The base sheets used in wet wipes generally contain cellulose-based fibers, and because cellulose is negatively charged, quaternary ammonium salts are easily adsorbed to the cellulose-based fibers. As a result, the concentration of quaternary ammonium salts in the cleaning solution released onto the surface being wiped is lower than the concentration of quaternary ammonium salts in the cleaning solution before it is impregnated into the base sheet.

[0004] In order to prevent the quaternary ammonium salt from being adsorbed on cellulosic fibers, Patent Document 1 discloses a method for preparing a quaternary ammonium salt containing quaternary ammonium salt. １ -COO-X １ ＋ or R ２ -O-(CH ２ CH ２ O) ｎ -CH ２ COO － X ２ ＋ It has been proposed to use an anionic surfactant represented by the formula (I) in combination with a quaternary ammonium salt. Patent Document 2 proposes to use an inorganic salt such as aluminum chloride, calcium chloride, or sodium chloride in combination with a quaternary ammonium salt.

[0005] JP 2018-15413 A JP 2018-15442 A

[0006] The present invention relates to a wiping sheet having a nonwoven fabric containing cellulosic fibers and an aqueous cleaning liquid impregnated into the nonwoven fabric. In one embodiment, the aqueous cleaning liquid preferably contains a quaternary ammonium salt and a nonionic surfactant. Detailed Description of the Invention

[0007] Although the techniques described in Patent Documents 1 and 2 can prevent quaternary ammonium salts from adsorbing to cellulosic fibers, they have the problem of not being sufficiently effective (hygienic) against bacteria and viruses because anionic surfactants or inorganic salts form complexes with the cationic moieties of the quaternary ammonium salts. Furthermore, when the cleaning solution contains inorganic salts, wiping streaks remain on the wiping surface, resulting in poor finish. Therefore, the present invention relates to a wiping sheet that prevents quaternary ammonium salts from adsorbing to cellulosic fibers without compromising hygiene, and is more hygienic than conventional wiping sheets.

[0008] The present invention will be described below based on preferred embodiments. In the present invention, "wiping" includes both cleaning and wiping, and includes, for example, cleaning of building surfaces such as floors, walls, ceilings, and pillars, cleaning of fixtures and fixtures, wiping of objects, wiping of the body and tools related to the body, etc. In the following, the aqueous cleaning solution may be simply referred to as "cleaning solution."

[0009] The present invention relates to a wiping sheet having a nonwoven fabric containing cellulosic fibers and an aqueous cleaning liquid impregnated into the nonwoven fabric, the aqueous cleaning liquid including a quaternary ammonium salt and a nonionic surfactant.

[0010] As the quaternary ammonium salt, those conventionally used as those having bactericidal and / or antibacterial activity can be appropriately used, for example, alkyltrimethylammonium salt, polyoxyethylene alkylmethylammonium salt, alkylbenzyldimethylammonium salt such as benzalkonium chloride, quaternary ammonium salt having a group in which an arylalkyl group is separated by an ether group, a benzyl group and two methyl groups, alkylpyridinium salt such as alkyl cetylpyridium chloride, etc. An example of a quaternary ammonium salt having a group in which an arylalkyl group is separated by an ether group, a benzyl group and two methyl groups is benzethonium chloride. An example of a group in which an arylalkyl group is separated by an ether group is a group in which the alkyl chain of the arylalkyl group is interrupted by an oxygen atom.

[0011] For example, the quaternary ammonium salt may be a compound represented by the following general formula (1):

[0012] In the formula, R １ R represents a linear or branched alkyl group having 6 to 28 carbon atoms, a linear or branched alkenyl group having 6 to 28 carbon atoms, an arylalkyl group having 7 to 28 carbon atoms, or a group in which the alkyl group, the alkenyl group, or the arylalkyl group is interrupted by an amide group, an ester group, or an ether group. ２ R represents a linear or branched alkyl group having from 1 to 28 carbon atoms, a linear or branched alkenyl group having from 1 to 28 carbon atoms, an arylalkyl group having from 7 to 28 carbon atoms, a group in which the alkyl group, the alkenyl group or the arylalkyl group is interrupted by an amide group, an ester group or an ether group, or an arylalkyl group having from 7 to 28 carbon atoms. ３ and R ４ represent the same or different linear or branched alkyl groups having 1 to 3 carbon atoms. ２ , R ３ and R ４ may be taken together to form a pyridine ring. － indicates an anion that is a counter ion of the ammonium ion.

[0013] In general formula (1), R １ In terms of improving the hygienic performance of the wiping sheet, such as disinfection and virus removal, a preferred embodiment of R is a group in which a linear or branched alkyl group, a linear or branched alkenyl group, or an aryl alkyl group is interrupted by an ether group, and a linear alkyl group is particularly preferred. １ From the same viewpoint as above, the number of carbon atoms in R is preferably 6 or more and 28 or less, and more preferably 8 or more and 18 or less. ２ is an arylalkyl group such as a benzyl group from the same viewpoint as above, or R ２ , R ３ and R ４ and preferably form a pyridine ring together. ２ , R ３ and R ４ do not combine to form a pyridine ring, R ２ The number of carbon atoms in R is preferably 1 or more and 28 or less, more preferably 1 or more and 18 or less, from the same viewpoint as above. ３ and R ４ From the same viewpoint as above, it is more preferable that A is 1 or more and 18 or less. － is an anion, and examples thereof include a carboxylate ion, a sulfonate ion, and a halogen ion. Among these, a halogen ion is preferred, a chloride ion and a bromide ion are more preferred, and a chloride ion is particularly preferred.

[0014] The quaternary ammonium salt is preferably an alkylbenzyldimethylammonium salt in terms of improving hygiene performance and easily forming mixed micelles with nonionic surfactants (particularly polyoxyethylene alkyl ethers), and is particularly preferably benzalkonium chloride.

[0015] From the viewpoint of improving hygiene performance and the dissolution stability of the aqueous cleaning solution, the content of the quaternary ammonium salt in the aqueous cleaning solution 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. Furthermore, from the viewpoint of safety, the content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and particularly preferably 0.2% by mass or less. The content of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.005% by mass or more and 0.5% by mass or less, more preferably 0.01% by mass or more and 0.3% by mass or less, and particularly preferably 0.02% by mass or more and 0.2% by mass or less. The preferred ranges of the quaternary ammonium salt referred to here are the amount in the aqueous cleaning solution impregnated into the nonwoven fabric. However, it is also preferable that the content of the quaternary ammonium salt in the aqueous cleaning solution obtained by squeezing the nonwoven fabric after impregnation be within the above-mentioned respective ranges.

[0016] The nonionic surfactant contained in the aqueous cleaning solution is preferably an alkylene oxide adduct nonionic surfactant such as ethylene oxide, as this can effectively prevent adsorption of quaternary ammonium salts on nonwoven fabrics containing cellulosic fibers, and in particular, a polyoxyalkylene alkyl ether such as polyoxyethylene alkyl ether is preferred.

[0017] Polyoxyethylene alkyl ethers, also known as "alcohol ethoxylates," are nonionic surfactants obtained, for example, by ethoxylating alcohol with ethylene oxide. The inventors discovered that when a nonwoven fabric containing cellulosic fibers such as rayon is impregnated with an aqueous cleaning solution, adding a polyoxyethylene alkyl ether to the aqueous cleaning solution together with a quaternary ammonium salt effectively prevents the quaternary ammonium salt in the aqueous cleaning solution from adsorbing to the cellulosic fibers. While the reason why polyoxyethylene alkyl ethers can inhibit the adsorption of quaternary ammonium salts to cellulosic fibers is unclear, it is believed that polyoxyethylene alkyl ethers effectively form stable mixed micelles with quaternary ammonium salts due to their structure consisting of hydrophilic and hydrophobic groups, thereby effectively inhibiting the adsorption of the cationic moieties of the quaternary ammonium salts to the negatively charged cellulosic fiber surfaces. This effect allows the use of quaternary ammonium salts to effectively demonstrate the hygienic performance achieved by using quaternary ammonium salts. Polyoxyethylene alkyl ethers are represented by the following general formula (2): In formula (2), "H" represents the hydroxyl group of the quaternary ammonium salt. ２ｍ＋１ C ｍ " represents the hydrophobic group, and "O(CH ２ -CH ２ -O) ｎ " indicates the hydrophilic group.

[0018] H ２ｍ＋１ C ｍ O (CH ２ CH ２ O) ｎ H (2) In the formula, m represents an integer of 1 or more, and n represents an integer of 2 or more.

[0019] The present inventors have discovered that when the nonionic surfactant is a polyoxyethylene alkyl ether having an ethylene oxide number of 10 or more, it can particularly effectively prevent the adsorption of quaternary ammonium salts to cellulosic fibers. From this perspective, the nonionic surfactant is preferably a polyoxyethylene alkyl ether having an ethylene oxide number of 15 or more, and even more preferably 20 or more. Furthermore, from the viewpoint of effectively preventing the adsorption of quaternary ammonium salts to cellulosic fibers, it is preferable that the polyoxyethylene alkyl ether have an ethylene oxide number of 50 or less, and particularly preferably 30 or less. Therefore, the ethylene oxide number of the polyoxyethylene alkyl ether is preferably 10 or more and 50 or less, more preferably 15 or more and 50 or less, and particularly preferably 20 or more and 30 or less. The ethylene oxide number is represented by "n" in the above formula (2).

[0020] Furthermore, the nonionic surfactant preferably contains two or more polyoxyethylene alkyl ethers having different ethylene oxide numbers. 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. It is also preferable to contain 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.

[0021] While hygiene can be enhanced by combining a polyoxyethylene alkyl ether having a low number of added moles of ethylene oxide (hereinafter referred to as "low EOAE") with a quaternary ammonium salt, the present inventors have conducted extensive research and found that the use of a polyoxyethylene alkyl ether having a high number of added moles of ethylene oxide (hereinafter referred to as "high EOAE") in addition to a low EOAE and a quaternary ammonium salt can improve the effect of preventing the adsorption of the quaternary ammonium salt onto cellulosic fibers, which is achieved by using a low EOAE. It has also been found that the use of a low EOAE, a high EOAE, and a quaternary ammonium salt in combination further improves hygiene compared to the use of a high EOAE and a quaternary ammonium salt alone.

[0022] In order to make the above-mentioned effect more pronounced, in the polyoxyethylene alkyl ether having an ethylene oxide number of less than 12, the ethylene oxide number is more preferably 4 or more but less than 12, and particularly preferably 8 or more but less than 11.

[0023] The length of the alkyl chain in the polyoxyethylene alkyl ether is well balanced with the number of ethylene oxides, and therefore, from the viewpoint of more easily exhibiting an excellent adsorption suppression effect, the number of carbon atoms m is preferably from 6 to 24, and more preferably from 9 to 18. When two or more polyoxyethylene alkyl ethers having different numbers of ethylene oxides are contained, the numbers of carbon atoms m of both may be the same or different.

[0024] When the quaternary ammonium salt has a long-chain alkyl group having 8 or more carbon atoms, the ratio N / n of the carbon number N of the long-chain alkyl group to the ethylene oxide number n of the polyoxyethylene alkyl ether in general formula (2) is preferably in the range of 0.15 to 3.0, in order to more effectively suppress adsorption of the quaternary ammonium salt to cellulosic fibers, and more preferably in the range of 0.20 to 1.8. When two or more polyoxyethylene alkyl ethers are used, the ethylene oxide number in the polyoxyethylene alkyl ether with the largest ethylene oxide number is defined as the value of n.

[0025] From the same viewpoint as above, the ratio N / m of the number of carbon atoms N in the long-chain alkyl group of the quaternary ammonium salt to the number of carbon atoms m in 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 two or more polyoxyethylene alkyl ethers are used, the number of carbon atoms in the alkyl chain of the polyoxyethylene alkyl ether with the largest number of carbon atoms in the alkyl chain is defined as the value of m.

[0026] Furthermore, from the same viewpoint as above, when the ethylene oxide number is 10 or more, the ethylene oxide number n of the polyoxyethylene alkyl ether is preferably equal to or greater than the carbon number m of the alkyl group of the polyoxyethylene alkyl ether (n≧m).

[0027] The content of the nonionic surfactant in the aqueous cleaning solution is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and particularly preferably 0.2% by mass or more, from the viewpoints of easily suppressing adsorption of quaternary ammonium salts to cellulosic fibers in the wiping sheet, detergency, and dissolution stability. Furthermore, 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, and particularly preferably 3.0% by mass or less, from the viewpoints of the finish after wiping (suppressing stickiness and foaming), prevention of substrate damage, and safety. The content of the nonionic surfactant in the aqueous cleaning solution 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 two or more nonionic surfactants are used, the content is calculated based on the total amount of all nonionic surfactants.

[0028] In order to suppress the adsorption of quaternary ammonium salts onto cellulosic fibers and thereby improve hygiene performance and cleaning performance, the ratio A / B of the content A (mass%) of nonionic surfactant to the content B (mass%) of quaternary ammonium salt in the aqueous cleaning solution is preferably 1 or more, more preferably 2 or more, and particularly preferably 5 or more. It is also preferably 100 or less, more preferably 60 or less, and particularly preferably 40 or less. It is also preferably 1 or more and 100 or less, more preferably 2 or more and 60 or less, even more preferably 5 or more and 60 or less, and particularly preferably 5 or more and 40 or less.

[0029] From the same viewpoint as above, the sum of the content A (mass%) of the nonionic surfactant and the content B (mass%) of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.01 mass% or more, more preferably 0.1 mass% or more, even more preferably 0.2 mass% or more, and particularly preferably 0.3 mass% or more. It is preferably 12 mass% or less, more preferably 5 mass% or less, even more preferably 4.5 mass% or less, and particularly preferably 3.5 mass% or less. It is also preferably 0.01 mass% or more and 12 mass% or less, more preferably 0.1 mass% or more and 5 mass% or less, even more preferably 0.2 mass% or more and 4.5 mass% or less, and particularly preferably 0.3 mass% or more and 3.5 mass% or less.

[0030] In order to further enhance the effect of inhibiting adsorption of quaternary ammonium salts onto cellulosic fibers and to improve cleaning properties, the amount of nonionic surfactant, particularly polyoxyethylene alkyl ether, per 100 parts by mass of surfactant contained in the aqueous cleaning solution is preferably 10 parts by mass or more, and even more preferably 50 parts by mass or more.

[0031] 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, and particularly preferably 100:30 to 300, in order to more easily obtain the remarkable effects achieved by containing these two or more polyoxyethylene alkyl ethers.

[0032] The aqueous cleaning liquid preferably further contains an antibacterial agent, such as an aromatic antibacterial agent or a glycol compound, in order to further improve the hygienic performance of the wiping sheet.

[0033] 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 substituted with a hydroxy group. Examples of alcohol-based antibacterial agents having an aromatic ring include benzyl alcohol, phenoxyethanol, phenethyl alcohol, and 3-phenylpropanol. Examples of antibacterial agents having a structure in which one or more hydrogen atoms of an aromatic hydrocarbon nucleus are substituted with a hydroxy group include parabens (also known as "parahydroxybenzoic 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 (chlorophen), isopropylmethylphenol (3-methyl-4-isopropylphenol, IPMP), parachlorometaxylenol (4-chloro-3,5-dimethylphenol, PCMX), and thymol. Examples of parabens include methylparaben and ethylparaben.

[0034] In the present invention, the use of an aromatic antibacterial agent is preferred because it is likely to particularly improve the virus removal effect of the wiping sheet. Among these, the use of phenoxyethanol or parabens is preferred, and the use of phenoxyethanol or methylparaben is particularly preferred.

[0035] Known glycol compounds used as antibacterial agents have no aromatic ring and have two hydroxy groups, such as propylene glycol, dipropylene glycol, isoprene glycol, butylene glycol, ethylene glycol, 1,2-pentanediol, 1,2-hexanediol, 1,2-octanediol, etc. Among these, dipropylene glycol is preferred from the standpoint of safety for household products that may be directly touched by people when used.

[0036] For these reasons, in the present invention, it is particularly preferable to use dipropylene glycol, phenoxyethanol or methylparaben as the antibacterial agent.

[0037] When an aromatic antibacterial agent is contained in an aqueous cleaning solution, the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and particularly preferably 0.1% by mass or more, from the viewpoint of easily obtaining the effects of using the aromatic antibacterial agent. Furthermore, the amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and particularly preferably 0.5% by mass or less, from the viewpoint of suppressing substrate damage to the surface to be wiped. The amount of the aromatic antibacterial agent in the aqueous cleaning solution is preferably 0.01% by mass or more to 1.0% by mass or less, more preferably 0.05% by mass or more to 0.8% by mass or less, and particularly preferably 0.1% by mass or more to 0.5% by mass or less.

[0038] When a glycol compound used as an antibacterial agent is contained in an aqueous cleaning solution, the amount of the glycol compound in the aqueous cleaning solution 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, from the viewpoints of enhancing antibacterial performance and the dissolution stability of the cleaning solution.

[0039] 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 viewpoints of suppressing adsorption of quaternary ammonium salts, cleaning properties, and the dissolution stability of the cleaning solution, it is preferable that the aqueous cleaning solution contain, as a surfactant, only a nonionic surfactant, or contain, as well as a nonionic surfactant, an amphoteric surfactant. Examples of amphoteric surfactants 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 thereof in the aqueous cleaning solution is preferably 0.01% by mass or more and 0.5% by mass or less.

[0040] The aqueous cleaning liquid may further contain additives in addition to the above-mentioned components, as 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, disinfectants other than alcohols and quaternary ammonium salts, preservatives, fragrances, perfumes, deodorizers, pH adjusters, sequestering agents, viscosity adjusters, solvents, etc. These may be used alone or in combination. These additives can be used as needed based on the properties required of the wiping sheet, and when used, the amount of each additive in the aqueous cleaning liquid is preferably 0.001% by mass or more and 20% by mass or less.

[0041] From the viewpoints of hygiene performance, safety, and prevention of damage to the substrate, the aqueous cleaning liquid of the wiping sheet preferably has a pH at 25° C. of 4 or more, more preferably 5 or more, and preferably 10 or less, more preferably 9.5 or less. The pH of the cleaning liquid can be adjusted to the above-mentioned range by adding, for example, a pH adjuster to an extent that the effects of the present invention are achieved.

[0042] The wiping sheet of the present invention is impregnated with a cleaning liquid mainly composed of water. The content of water in the cleaning liquid is preferably 80.0 mass % or more, more preferably 90.0 mass % or more, and is preferably 99.8 mass % or less, more preferably 99.0 mass % or less, based on the total mass of the cleaning liquid.

[0043] Next, nonwoven fabrics containing cellulose-based fibers will be described. Examples of cellulose-based fibers include fibers containing or derived from cellulose, and the fiber surfaces are negatively charged. Examples of cellulose-based fibers include rayon fibers, cupra fibers, lyocell fibers, acetate fibers, polynosic fibers, pulp fibers, and cotton fibers. These cellulose-based fibers may be used alone or in combination. Among these, it is preferable for the nonwoven fabric used in the present invention to contain rayon fibers as the cellulose-based fibers in terms of the retention of cleaning liquid and the uniform spreading of the cleaning liquid over the entire sheet during storage.

[0044] The proportion of cellulosic fibers in the nonwoven fabric is preferably 1% by mass or more, since the effect of using the specific surfactant of the present invention is excellent. From this viewpoint, the proportion of cellulosic fibers in the nonwoven fabric is particularly preferably 5% by mass or more, and even more preferably 10% by mass or more. On the other hand, there is no upper limit to the proportion of cellulosic fibers in the nonwoven fabric, and it may be, for example, 100% by mass or less.

[0045] From the viewpoints of retaining the cleaning liquid and operability during wiping (low wiping resistance), the fineness of the cellulose-based 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.

[0046] The nonwoven fabric can contain fibers other than cellulosic fibers. Examples of fibers other than cellulosic fibers include synthetic fibers. From the viewpoint of manufacturing efficiency, the synthetic fibers are preferably made from a fiber-forming resin. 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, and fluororesins such as polyperfluoroethylene. These resins can be used alone or in combination.

[0047] From the viewpoint of operability 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 thereof is preferably 4 dtex or less, more preferably 3.5 dtex or less, and even more preferably 3 dtex or less.

[0048] When the nonwoven fabric contains synthetic fibers, the amount of synthetic fibers in the nonwoven fabric is particularly preferably 95% by mass or less, and even more preferably 90% by mass or less, from the viewpoints of optimizing the amount of cellulosic fibers and of operability and stain removal during wiping. On the other hand, the proportion of synthetic fibers in the nonwoven fabric is preferably 10% by mass or more, and more preferably 20% by mass or more, from the viewpoints of cleaning solution retention and operability during wiping.

[0049] In nonwoven fabrics, fibers such as cellulosic fibers and synthetic fibers form a fiber aggregate by piling up, entangling, or bonding with each other. The fibers constituting the nonwoven fabric may or may not be fused with 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.

[0050] The basis weight of the nonwoven fabric constituting the wiping sheet is 30 g / m when the nonwoven fabric is in a dry state. ２ More than 35 g / m ２ More preferably, 40 g / m or more ２ More preferably, the upper limit is 100 g / m ２ Preferably, 90 g / m or less ２ More preferably, 80 g / m or less ２ The following is even more preferable. The term "dry state" means that the moisture content of the nonwoven fabric is 3% by mass or less. When the basis weight of the nonwoven fabric in the dry state is within this 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 furthermore, being excellent in strength during wiping.

[0051] Examples of nonwoven fabrics that can be used include spunlace nonwoven fabrics, meltblown nonwoven fabrics, spunbond nonwoven fabrics, air-through nonwoven fabrics, resin-bond nonwoven fabrics, and needle-punched nonwoven fabrics. A composite of these nonwoven fabrics may also be used. Among these, spunlace nonwoven fabrics are preferred from the viewpoint of ease of entanglement with fibrous debris such as hair and cotton dust.

[0052] The wiping sheet of the present invention, which has a nonwoven fabric containing cellulosic fibers, 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 thereof.

[0053] In order to provide the wiping sheet with sufficient strength during use, the wiping sheet of the present invention may further include a scrim net for supporting the nonwoven fabric. The scrim net is preferably 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, lattice, and strand shape.

[0054] The scrim net can be made of resin, such as 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.

[0055] From the viewpoint of achieving both the entanglement of the constituent fibers and the scrim net and the strength of the wiping sheet, the wire diameter (diameter in cross section) of the scrim net can be appropriately adjusted depending on 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 wire diameter of the scrim net may be partially different or may be the same, and when the wire diameter is partially different, the wire diameter of the scrim is taken as the average value. The basis weight of the scrim net is 1 g / m ２ More than 3 g / m is preferable. ２ More preferably, 20 g / m ２ Preferably, less than 10 g / m ２ The following is even more preferred:

[0056] From the viewpoint of realizing the stain removal function, the proportion of the aqueous cleaning liquid impregnated into the nonwoven fabric is preferably 50% by mass or more, more preferably 100% by mass or more, and is preferably 800% by mass or less, more preferably 600% by mass or less, relative to the mass of the nonwoven fabric.

[0057] From the viewpoint of the impregnation of the nonwoven fabric with the aqueous cleaning solution, ２Mass of cellulosic fiber per unit area (g / m ２ ) is 5 g / m in the dry state of the nonwoven fabric ２ More than 10 g / m ２ From the viewpoint of being able to continuously release an appropriate amount of aqueous cleaning liquid during wiping, it is more preferable to ２ Mass of cellulosic fiber per unit area (g / m ２ ) is 60 g / m ２ Preferably, 50 g / m or less ２ More preferably, 40 g / m or less ２ The following is even more preferred:

[0058] From the viewpoint of impregnation of aqueous cleaning liquid, 1 m of nonwoven fabric ２ Mass of cellulosic fiber per unit area (g / m ２ The ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the nonwoven fabric is preferably 0.005 or more, more preferably 0.01 or more, and even more preferably 0.05 or more. ２ Mass of cellulosic fiber per unit area (g / m ２ The ratio of the mass of the aqueous cleaning liquid per 1 g of nonwoven fabric to the mass of the nonwoven fabric is preferably 1.0 or less, more preferably 0.8 or less, and even more preferably 0.5 or less.

[0059] From the viewpoint of hygiene performance, 1 m of nonwoven fabric ２ Mass of cellulosic fiber per unit area (g / m ２ The mass ratio of the quaternary ammonium salt in the aqueous cleaning solution per 1 g of nonwoven fabric to the mass of the quaternary ammonium salt in the aqueous cleaning solution per 1 g of nonwoven fabric is preferably 0.00001 or more, more preferably 0.00005 or more, and even more preferably 0.0001 or more. ２ Mass of cellulosic fiber per unit area (g / m ２ The mass ratio of the quaternary ammonium salt in the aqueous cleaning liquid per 1 g of nonwoven fabric to the total mass of the nonwoven fabric is preferably 0.001 or less, more preferably 0.0005 or less, and even more preferably 0.00035 or less.

[0060] From the viewpoint of oil stain removal effect and suppression of adsorption of quaternary ammonium salts to fibers, ２ Mass of cellulosic fiber per unit area (g / m ２The mass ratio of the nonionic surfactant in the aqueous cleaning solution per 1 g of nonwoven fabric to the nonionic surfactant in the aqueous cleaning solution is preferably 0.00005 or more, more preferably 0.0001 or more, and even more preferably 0.0002 or more. ２ Mass of cellulosic fiber per unit area (g / m ２ The mass ratio of the nonionic surfactant in the aqueous cleaning liquid per 1 g of nonwoven fabric to the total mass of the nonionic surfactant is preferably 0.04 or less, more preferably 0.02 or less, and even more preferably 0.01 or less.

[0061] The wiping sheet can be used alone or attached to a cleaning tool such as a wiper to clean floors, walls, and other surfaces in buildings, fittings such as cupboards, windowpanes, mirrors, doors, and doorknobs, rugs, carpets, furniture such as dining tables, kitchens, toilets, and the body, as well as for sanitary goods and packaging.

[0062] In particular, the wiping sheet of the present invention is a nonwoven fabric containing cellulosic fibers impregnated with a cleaning liquid containing a quaternary ammonium salt and a nonionic surfactant, which effectively prevents the quaternary ammonium salt from adsorbing to the cellulosic fibers in the nonwoven fabric. This allows a large amount of quaternary ammonium salt to remain in the squeezed liquid squeezed out when wiping with the wiping sheet of the present invention and on the surface to be wiped after wiping, thereby effectively demonstrating the disinfecting, antiviral, and antibacterial effects of the quaternary ammonium salt and providing excellent hygiene performance.

[0063] Although the present invention has been described above based on the preferred embodiments, the present invention is not limited to the above embodiments.

[0064] In addition to the above-described embodiments, the present invention further discloses the following wiping sheet. <1> A wiping sheet having a nonwoven fabric containing cellulosic fibers and an aqueous cleaning liquid impregnated into the nonwoven fabric, wherein the aqueous cleaning liquid contains a quaternary ammonium salt and a nonionic surfactant. <2> The wiping sheet according to <1>, wherein, when the content of the nonionic surfactant in the aqueous cleaning liquid is A (% by mass) and the content of the quaternary ammonium salt is B (% by mass), A + B is 0.01% by mass or more, preferably 0.1% by mass or more, more preferably 0.2% by mass or more, particularly preferably 0.3% by mass or more, and 12% by mass or less, preferably 5% by mass or less, more preferably 4.5% by mass or less, and particularly preferably 3.5% by mass or less.

[0065] <3> The wiping sheet according to <1> or <2>, wherein the ratio A / B, where A (mass%) is the content of the nonionic surfactant contained in the aqueous cleaning liquid and B (mass%) is the content of the quaternary ammonium salt, 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. <4> The wiping sheet according to any one of <1> to <3>, wherein the nonionic surfactant is a polyoxyalkylene alkyl ether. <5> The wiping sheet according to any one of <1> to <4>, wherein the polyoxyalkylene alkyl ether is preferably 10 parts by mass or more, and even more preferably 50 parts by mass or more, per 100 parts by mass of the surfactant contained in the aqueous cleaning liquid.

[0066] <6> The wiping sheet according to <4> or <5>, wherein the ethylene oxide number in the polyoxyalkylene alkyl ether is 20 or more. <7> The wiping sheet according to <4> or <5>, comprising 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 according to <7>, 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, and particularly preferably 100:30 to 300.

[0067] <9> The wiping sheet according to 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>, further containing an aromatic antibacterial agent. <11> The wiping sheet according to <10>, wherein 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, and particularly preferably 0.1% by mass or more, and the amount of the aromatic antibacterial agent is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and particularly preferably 0.5% by mass or less.

[0068] <12> The wiping sheet according to <10> or <11>, wherein the aromatic antibacterial agent is phenoxyethanol or methylparaben. <13> The wiping sheet according to any one of <1> to <12>, further comprising dipropylene glycol, phenoxyethanol or methylparaben. <14> The wiping sheet according to any one of <1> to <13>, wherein the cellulosic fibers contained in the nonwoven fabric are 1 mass% or more.

[0069] <15> The wiping sheet according to any one of <1> to <14>, wherein the cellulose-based fibers are rayon fibers. <16> The wiping sheet according to any one of <1> to <15>, wherein the cellulose-based fibers are contained in the nonwoven fabric in an amount of preferably 5% by mass or more, more preferably 10% by mass or more and 100% by mass or less. <17> The basis weight of the nonwoven fabric is preferably 30 g / m ２ More preferably, 35 g / m ２ More preferably, it is 40 g / m ２ The basis weight of the nonwoven fabric is preferably 100 g / m ２ More preferably, 90 g / m or less. ２ More preferably, it is 80 g / m or less. ２ The wiping sheet according to any one of <1> to <16>, which is as follows:

[0070] <18> 1 m of the nonwoven fabric ２ The mass of the cellulosic fibers per unit area is preferably 5 g / m ２ More preferably, it is 10 g / m or more. ２ The above, and 1 m of the nonwoven fabric ２ The mass of the cellulosic fibers per unit area is preferably 60 g / m ２ More preferably, it is 50 g / m or less. ２ More preferably, it is 40 g / m or less. ２<19> The wiping sheet according to any one of <1> to <18>, wherein the proportion of the aqueous cleaning liquid impregnated into the nonwoven fabric is preferably 50% by mass or more, more preferably 100% 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 800% by mass or less, more preferably 600% by mass or less, relative to the mass of the nonwoven fabric. <20> The wiping sheet according to any one of <1> to <19>, wherein the content of a nonionic surfactant in the aqueous cleaning liquid is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.2% by mass or more, and the content of a nonionic surfactant in the aqueous cleaning liquid is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and even more preferably 3.0% by mass or less.

[0071] <21> The wiping sheet according to any one of <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, and even more 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, and even more preferably 0.2% by mass or less. <22> The wiping sheet according to any one of <1> to <20>, wherein 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, and even more preferably 0.2% by mass or less, ２ The mass (g / m) of the cellulosic fiber ２ The ratio of the mass of the aqueous cleaning liquid per 1 g of the nonwoven fabric to the mass of the nonwoven fabric is preferably 0.005 or more, more preferably 0.01 or more, and even more preferably 0.05 or more. ２ The mass (g / m) of the cellulosic fiber ２ <21> The wiping sheet according to any one of <1> to <21>, wherein the ratio of the mass of the aqueous cleaning liquid per 1 g of the nonwoven fabric to the mass of the aqueous cleaning liquid per 1 g of the nonwoven fabric is preferably 1.0 or less, more preferably 0.8 or less, and even more preferably 0.5 or less.

[0072] <23> 1 m of the nonwoven fabric ２ The mass (g / m) of the cellulosic fiber ２ The ratio of the mass of the quaternary ammonium salt in the aqueous cleaning solution per 1 g of the nonwoven fabric to the mass of the quaternary ammonium salt in the aqueous cleaning solution is preferably 0.00001 or more, more preferably 0.00005 or more, and even more preferably 0.0001 or more, and ２ The mass (g / m) of the cellulosic fiber ２ <24> The wiping sheet according to any one of <1> to <22>, wherein the ratio of the mass of the quaternary ammonium salt in the aqueous cleaning liquid per 1 g of the nonwoven fabric to the mass of the quaternary ammonium salt in the aqueous cleaning liquid per 1 m of the nonwoven fabric is preferably 0.001 or less, more preferably 0.0005 or less, and even more preferably 0.00035 or less. ２ The mass (g / m) of the cellulosic fiber ２ The ratio by mass of the nonionic surfactant in the aqueous cleaning solution per 1 g of the nonwoven fabric to the total mass of the nonionic surfactant in the aqueous cleaning solution is preferably 0.00005 or more, more preferably 0.0001 or more, and even more preferably 0.0002 or more, and ２ The mass (g / m) of the cellulosic fiber ２ <24> The wiping sheet according to any one of <1> to <23>, wherein the ratio by mass of the nonionic surfactant in the aqueous cleaning liquid per 1 g of the nonwoven fabric to the mass of the nonionic surfactant in the aqueous cleaning liquid per 1 g of the nonwoven fabric is preferably 0.04 or less, more preferably 0.02 or less, and even more preferably 0.01 or less.

[0073] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited to these examples.

[0074] Example 1 and Comparative Example 1 Spunlace nonwoven fabric was used as the nonwoven fabric. The spunlace nonwoven fabric was impregnated with an aqueous cleaning solution having the composition shown in Table 1 at a ratio of 400% by mass relative to its mass, and then placed in a polyethylene bag, five sheets folded in four, and stored at 25°C for one week. The nonwoven fabric was then compressed using a tabletop mangle roller to obtain a compressed liquid. The concentration of quaternary ammonium salt in the obtained compressed liquid was quantified using a liquid chromatograph (Agilent 1200, manufactured by Agilent). Based on the concentration C1 of the quaternary ammonium salt in the aqueous cleaning solution and the concentration C2 of the quaternary ammonium salt in the compressed liquid, the adsorption rate and adsorption inhibition rate were calculated using the following formula, and the adsorption inhibition ability was scored. The ratio in the cleaning solution shown in Table 1 does not refer to the amount of formulation, but to the amount of active ingredient contained in the formulation. The spunlace nonwoven fabric used was product number NW-RH3-55BS manufactured by Daiwabo Co., Ltd. The nonwoven fabric has a size of 150 mm x 240 mm and a basis weight of 50 g / m ２ The blending ratio of rayon fiber was 80% by mass. The blending ratio of synthetic PP / PE composite fiber was 20% by mass. Adsorption rate = C2 / C1 Adsorption suppression rate = 1 - {Adsorption rate / Adsorption rate of Comparative Example 1 (75%)} 4 points: Adsorption suppression rate is 45% or more 3 points: Adsorption suppression rate is 35% to 44% 2 points: Adsorption suppression rate is 20% to 34% 1 point: Adsorption suppression rate is 0% to 19%

[0075]

[0076] Examples 2 to 6 In Examples 2 to 6, the number of ethylene oxide units in the polyoxyethylene alkyl ether in Example 1 was changed to 4 (Example 2), 12 (Example 3), 19 (Example 4), 23 (Example 5), and 47 (Example 6), respectively. Otherwise, the same procedures as in Example 1 were carried out to evaluate the ability to inhibit adsorption of quaternary ammonium salts. The results are shown in Table 2.

[0077]

[0078] Examples 7 to 18 and Comparative Examples 2 to 5 As nonwoven fabrics containing cellulose-based fibers, scrim nets (made of polypropylene, wire diameter approximately 100 μm, basis weight 5 g / m) were prepared by hydroentangling fibers containing synthetic fibers and cellulose-based fibers. ２ 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 by mass ratio, and the basis weight in a dry state was 70 g / m ２ The sheet had a size of 285 mm x 205 mm. The sheet was impregnated with 350% by mass of the cleaning liquid to prepare the desired wet wiping sheet.

[0079] The cleaning solution was an aqueous solution containing 0.05% by mass of an amphoteric surfactant (lauryl dimethylamine oxide), 2% by mass of alcohol, 1% by mass of a solvent (methyl propylene glycol), 0.01% by mass of a preservative (1,2-benzisothiazolin-3-one), 0.01% by mass of a sequestering agent, and the components listed in Table 3 in the amounts listed in the same table. A pH adjuster was further added to adjust the pH to 9.0. The pH of the cleaning solution at 25°C before impregnation was adjusted using a pH measuring device (pH meter F22, manufactured by HORIBA). The water content of the cleaning solution was 90.0% by mass or more.

[0080] [Bacterial Disinfection Activity Value (Squeezed Liquid)] After impregnating the nonwoven fabric with the cleaning solution, five sheets were stacked in four and stored in a polyethylene bag at 25°C for one week. The nonwoven fabric was then squeezed using a tabletop mangle roller to obtain a squeezed liquid (squeezed liquid). The obtained squeezed liquid was subjected to a sterilization test. The test was conducted in accordance with the sterilization activity test method for household synthetic detergents and soaps established by the Detergent and Soap Fair Trade Council. Escherichia coli and Staphylococcus aureus were used in the test. A test bacterial solution was applied to a stainless steel test piece, and then a test sample was applied thereon. After leaving it for 5 minutes, the test piece was administered into an inactivating agent (LP diluted solution) in a vial. Bacteria were then extracted from the vial and cultured under specified conditions, and the surviving bacteria were measured. The sterilization activity value was calculated using the following formula. The results are shown in Table 3. The results of Examples 1 and 5 are also shown in the same table. As a control sample, a sterilized 0.05 w / v % aqueous solution of polysorbate 80 was used.

[0081] - Method for calculating disinfection activity value Disinfection activity value = X - Y X: Average of three common logarithm values ​​of the number of bacteria when contacted with the control sample Y: Average of three common logarithm values ​​of the number of bacteria when contacted with the test sample Performance was scored based on the size of the disinfection activity value. 4 points: 3.5 or more 3 points: 2.5 or more but less than 3.5 2 points: 2.0 or more but less than 2.5 1 point: 0 or more but less than 2.0

[0082] [Antibacterial activity value] A 5 cm square stainless steel plate was wiped with the wet wiping sheets of the Examples and Comparative Examples at a resistance of 0.64 kN / m ２ The resulting surface-treated stainless steel plate was subjected to an antibacterial test. The test was carried out in accordance with the test method specified in JIS Z 2801:2010 (ISO 22196:2007). Escherichia coli and Staphylococcus aureus were used in the test. A bacterial solution was dropped onto the 5 cm square test pieces (antibacterial treated and untreated), which were then covered with a 4 cm square film and incubated for 24 hours at a temperature of 35±1°C and a relative humidity of 90% or higher. After incubation, the test bacteria on the test pieces were washed out and collected, and then 1 cm ２The number of viable bacteria per unit area was measured. The antibacterial activity value was calculated using the following formula. The results are shown in Table 3, which also shows the results of Examples 1 and 5. As a control sample, an untreated stainless steel plate was sterilized and used.

[0083] Calculation method of antibacterial activity value Antibacterial activity value = X'-Y' X': 1 cm of the control sample after 24 hours ２ Y': Average value of the common logarithm of the number of viable bacteria per 1 cm of the wiped sample after 24 hours ２ The performance was scored based on the magnitude of the disinfection activity value. 4 points: 3.5 or more 3 points: 2.5 or more and less than 3.5 2 points: 2.0 or more and less than 2.5 1 point: 0 or more and less than 2.0

[0084] [Virus removal activity value] 0.64 kN / m for the wet wiping sheets of Examples and Comparative Examples ２ The wiping speed was 1 m / s, and the wiping area was 20 tatami mats (32.4 m²). ２ Wiping was performed continuously for 10 minutes (equivalent to 10 minutes). The cleanliness of the flooring before wiping was kept constant by washing with a 70% ethanol aqueous solution and wiping with Kimtowel (registered trademark). After wiping, the wiping sheets of the Examples and Comparative Examples were evaluated in accordance with the "Test for disinfection performance of wet wipers" established by the Japan Clean Paper and Cotton Industry Association. Influenza A virus was selected as the virus species. The virus count was 1.1 x 10 ９ 0.01 mL of the virus preparation was inoculated onto a stainless steel plate and spread over an area of ​​15 mm x 90 mm with a cone-sized stick. The plate was wiped with the wiping sheets of the Examples and Comparative Examples after the above wiping. The wiping operation was carried out by applying a force of 0.78 kN / m ２The wipe was carried out by moving the wiper back and forth over the plate five times at intervals of approximately 2 seconds with a load of 1000 kJ / s. After wiping, 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 10 times with a swab (manufactured by KK). The swab was impregnated with 1.5 mL of SCDLP liquid medium. The mixture was then 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 a blank. A 10-fold dilution series of the virus suspension was prepared using EMEM, and the virus infectivity per 0.1 mL of the virus suspension was measured by the plaque assay to calculate the virus infectivity (PFU / stainless steel plate). The same procedure was performed using a control sheet, and the average common logarithm of the measured virus infectivity (PFU / stainless steel plate) was calculated. As a control sheet, a Kanakin No. 3 (285 mm x 205 mm) sheet, specified in the attached white cloth for JIS L0803 color fastness tests, was impregnated to 150% with physiological saline solution in which 0.05% polysorbate 80 had been dissolved instead of a cleaning solution. The Kanakin No. 3 sheet had been previously washed and sterilized using the method specified in the test method. The virus removal activity value was quantified using the following calculation formula. The results are shown in Table 3. The table also lists the results of Examples 1 and 5. Virus removal activity value = X'' - Y'' X'': the average value of the common logarithm of the virus infectivity titer (PFU / stainless steel plate) obtained from three trials using the control sheet. Y'': the average value of the common logarithm of the virus infectivity titer (PFU / stainless steel plate) obtained from three trials using the test wiping sheet. The virus removal performance was scored according to the following criteria based on the magnitude of the virus removal activity value calculated using the above calculation formula. 4 points: 3.5 or more 3 points: 2.5 or more but less than 3.5 2 points: 2.0 or more but less than 2.5 1 point: Less than 2.0

[0085] [Detergency for oil stains] 0.4 g of colored oleic acid was applied to the surface of a wooden floor having dimensions of 700 mm x 300 mm to be wiped. The wiping sheet was used to wipe the floor in the longitudinal direction up to 10 times, and the number of times that the oleic acid could be removed was counted. The wiping conditions were a load of 0.64 kN / m ２The speed was 1 m / sec. The number of strokes required to remove the oily stain was scored. The results are shown in Table 3, which also lists the results of Examples 1 and 5. 4 points: Removable within 5 strokes 3 points: Removable within 6 to 9 strokes 2 points: Some stains remain after 10 strokes 1 point: Most stains remain after 10 strokes

[0086] [Overall evaluation] The overall evaluation was calculated by calculating the average score of all evaluation items and ranking them according to the following criteria. In addition, if any evaluation item received a score of 1, it was ranked D regardless of the average score. ＋ : 4.0 points. A: The average score is 3.5 points or more and less than 4.0 points. B: The average score is 3.0 points or more and less than 3.5 points. C: The average score is 2.0 points or more and less than 3.0 points. D: The average score is less than 2.0 points or there is a score of 1 in any of the evaluation items.

[0087]

[0088] The results shown in Tables 1 to 3 show that nonionic surfactants such as polyoxyethylene alkyl ethers can suppress the adsorption of quaternary ammonium salts to cellulosic fibers compared to the use of conventional surfactants. Furthermore, in a wiping sheet having a nonwoven fabric containing cellulosic fibers and an aqueous cleaning solution containing a quaternary ammonium salt, adding polyoxyethylene alkyl ether to the aqueous cleaning solution improves the disinfecting, antibacterial, and antiviral effects of the liquid squeezed from the wiping sheet.

[0089] According to the wiping sheet of the present invention, the adsorption of quaternary ammonium salt to cellulosic fibers is inhibited without compromising hygiene, so that a sufficient amount of quaternary ammonium salt is supplied to the surface to be wiped, and the surface to be wiped becomes highly hygienic.

Claims

DEPCT671. Cleaning wipes composed of: a non-woven fabric made of cellulose fibers and a cleaning liquid containing sea water impregnated into the non-woven fabric, in which the cleaning liquid contains quaternary ammonium salts and nonionic surfactants.

2. Cleaning wipes according to claim 1 in which A+B equals 0.01% by mass or more and 12% by mass or less, where A is the amount present (% by mass) of nonionic surfactants incorporated into the claim. A is the amount of nonionic surfactant present in the aqueous cleaning liquid and B is the percentage (% by mass) of quaternary ammonium salt in the aqueous cleaning liquid.

3. Cleaning wipes pursuant to claim 1 or 2 where A / B equals 1 or more and 100 or less, where A is the amount of nonionic surfactant present in the aqueous cleaning liquid and B is the amount of quaternary ammonium salt present in the aqueous cleaning liquid. 4.

5. Cleaning wipes under any one of the claims 1 through 3 where the nonionic surfactant is polyoxyalkylene alkyl ether.

6. Cleaning wipes under claim 4 where the polyoxyalkylene alkyl ether is polyoxyethylene alkyl ether and polyoxyethylene alkyl ether contains 15 or more ethylene oxides.

7. Cleaning wipes under claim 4 where polyoxyethylene alkyl ether contains 20 or more ethylene oxides and polyoxyethylene alkyl ether contains 15 or more ethylene oxides.

7. Cleaning wipes under any of the claims 1 through 6 in which the quaternary ammonium salt is benzalkonium chloride.

8. Cleaning wipes under any of the claims 1 through 7 in which dipropylene glycol, phenoxyethanol, or methylparaben are additionally incorporated.

9. Cleaning wipes under any of the claims 1 through 8 in which the mass of cellulose fibers in 1 square meter of non-woven fabric is 5 g / m² or more and 60 g / m² or less. 10.

11. Any cleaning wipe under any of the claims 1 through 9 where the proportion of the water-containing cleaning liquid permeated into the non-woven fabric is 50% by mass or more and 800% by mass or less relative to the mass of the non-woven fabric.

11. Any cleaning wipe under any of the claims 1 through 10 where the ratio of the mass of the water-containing cleaning liquid in 1 gram of non-woven fabric to the mass of cellulose fibers in 1 square meter of non-woven fabric (g / m²) is 0.005 or more and 1.0 or less.

12. Any cleaning wipe under any of the claims 1 through 11 where the ratio of the mass of the quaternary ammonium salt in the water-containing cleaning liquid in 1 gram of non-woven fabric to the mass of cellulose fibers in 1 square meter of non-woven fabric (g / m²) is 0.00001 or more and 0.001 or less. 13.Cleaning wipes pursuant to any one of the claims 1 through 12 where the ratio of the mass of nonionic surfactant in an aqueous cleaning liquid in 1 gram of nonwoven fabric to the mass of cellulose fibers in 1 square meter of nonwoven fabric (g / m²) is 0.00005 or more and 0.04 or less;