Cleaning sheet for hard surface

Abstract

To provide a cleaning sheet for hard surfaces capable of maintaining detergency by improving the influence caused by a decrease in pH before and after storage (for example, storage at room temperature for one year or more), and capable of obtaining excellent washability and virus inactivation effect by suppressing a decrease in the virus inactivation effect, and a method for inactivating a virus using the same.SOLUTION: A cleaning sheet for hard surfaces comprises: an aqueous composition comprising (a) an organic amine (hereinafter referred to as component (a)) in an amount of 0.5 mass% or more, water, and optionally an alkaline agent other than component (a) (hereinafter referred to as component (c)), the aqueous composition having a pH of 9 or more to 14 or less at 25°C; and a nonwoven or woven fabric containing 20 mass% or more and 80 mass% or less of polyester fibers.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a wiping sheet for hard surfaces and a method for inactivating viruses using the same. [Background technology]

[0002] When sterilizing and cleaning instruments and equipment, and when cleaning and disinfecting floors and walls in facilities requiring hygiene management such as hospitals or nursing homes, a disinfectant-containing cleaning solution is sprayed or applied and then dried or wiped off with a cloth, or the surface is wiped with a cleaning sheet made of nonwoven or woven fabric impregnated with the cleaning solution.In particular, in hospitals, the infection control guidelines state that environmental surfaces that are regularly touched by hands should be cleaned at least once a day, and for convenience, wiping with a cleaning sheet made of nonwoven or woven fabric impregnated with the cleaning solution is often used.

[0003] Patent Document 1 discloses a cleaning sheet in which an aqueous disinfectant is impregnated into a base sheet capable of retaining liquid, the aqueous disinfectant containing a quaternary ammonium salt surfactant as component (A), at least one selected from inorganic electrolytes, organic acids, and organic acid salts as component (B), an aminocarboxylic acid chelating agent as component (C), and water as component (D), the pH of the aqueous disinfectant impregnated into the base sheet being 4.8 or more and 8.0 or less, and the base sheet containing at least one selected from recycled fibers, synthetic fibers, and natural fibers. This cleaning sheet not only has disinfecting properties against bacteria and mold and virus inactivation effects, but also has little reduction in disinfecting effect when the base sheet is impregnated with a disinfectant, and is excellent in preventing uneven distribution of the disinfectant on the base sheet and anti-mold properties. Patent Document 2 describes a cleaning sheet in which an aqueous disinfectant is impregnated into a base sheet capable of retaining liquid, the aqueous disinfectant containing a quaternary ammonium salt surfactant as component (A), potassium hydroxide as component (B), an aminocarboxylic acid chelating agent as component (C), and water as component (D), the pH of the aqueous disinfectant impregnated into the base sheet being 10.5 or more and 13.5 or less, and the base sheet containing at least one fiber selected from recycled fibers, synthetic fibers, and natural fibers, the cleaning sheet having excellent disinfecting properties and virus inactivating effects, excellent antibacterial and antiviral durability, and capable of reducing wiping marks after wiping. Patent Document 3 describes a disinfecting sheet in which an aqueous disinfectant is impregnated into a base sheet capable of retaining liquid, the aqueous disinfectant containing a quaternary ammonium salt surfactant as component (A), an inorganic electrolyte and / or citrate as component (B), an alkaline agent other than component (B) as component (C), and water as component (D), the pH of the aqueous disinfectant impregnated into the base sheet being 8.1 or higher and 12.0 or lower, and the base sheet containing at least one fiber selected from recycled fibers, synthetic fibers, and natural fibers, and which not only has disinfecting properties against bacteria but also against viruses that are highly resistant to the disinfectant, and which does not risk a decrease in the disinfecting and viral removal effects or their duration when impregnated into the base sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-090564 [Patent Document 2] Japanese Patent Application Publication No. 2019-112342 [Patent Document 3] Japanese Patent Application Publication No. 2018-027916 Summary of the Invention [Problem to be solved by the invention]

[0005] Wiping sheets used for cleaning and disinfecting hard surfaces are made by impregnating a nonwoven or woven fabric with an aqueous composition. Natural fibers such as cellulosic fibers are used for the nonwoven or woven fabric, but these fibers lack rigidity when used for wiping. To improve this, polyester fibers are blended with the nonwoven or woven fabric. Furthermore, making the aqueous composition alkaline is not only effective in improving the cleaning ability against oil stains and the like on hard surfaces, but also in order to improve the sterilizing, antibacterial, and virus inactivating effects, it is necessary to make the aqueous composition impregnated into the nonwoven fabric or woven fabric alkaline. However, the present inventors have discovered that when a wiping sheet is made by impregnating a nonwoven fabric or woven fabric blended with polyester fibers with an alkaline aqueous composition, the virus inactivating effect of the wiping sheet decreases over time after storage.

[0006] The present invention provides a hard surface wiping and cleaning sheet that is resistant to the effects of a decrease in pH before and after storage (for example, storage at room temperature for one year or more), maintains cleaning power, and inhibits a decrease in virus inactivation effect, thereby achieving good cleaning properties and virus inactivation effects, as well as a virus inactivation method using the same. [Means for solving the problem]

[0007] The present invention relates to an aqueous composition containing 0.5% by mass or more of (a) an organic amine (hereinafter referred to as component (a)), water, and optionally an alkaline agent other than component (a) (hereinafter referred to as component (c)), the aqueous composition having a pH of 9 or more and 14 or less at 25°C; and a nonwoven or woven fabric having a polyester fiber content of 20% by mass or more and 80% by mass or less.

[0008] The present invention also relates to a method for inactivating viruses, which comprises wiping a hard surface on which a virus is present or is suspected to be present with the hard surface wiping and cleaning sheet of the present invention.

[0009] In the present invention, "virus inactivation" may mean killing a virus or eliminating its infectivity. Furthermore, "virus inactivation effect" means killing a part or all of a virus, or eliminating the infectivity, toxicity, or other activities of a virus. [Effects of the Invention]

[0010] The present invention provides a wiping sheet for hard surfaces that can suppress a decrease in cleaning power before and after storage (for example, storage at room temperature for one year or more) and further suppress a decrease in virus inactivation effect, thereby achieving good cleaning properties and virus inactivation effects, and a virus inactivation method using the same. DETAILED DESCRIPTION OF THE INVENTION

[0011] The reason why the hard surface wiping sheet of the present invention and the virus inactivation method using the same are able to suppress the decrease in virus inactivation effect before and after storage (e.g., storage at room temperature for one year or more) and achieve good virus inactivation effect is not entirely clear, but is presumed to be as follows. In the hard surface wiping and cleaning sheet of the present invention, the alkaline aqueous composition impregnated into the nonwoven or woven fabric contains a specific amount of organic amine as component (a), which makes the specific amount of polyester fibers contained in the nonwoven or woven fabric less susceptible to hydrolysis during storage, and hydroxide ions in the aqueous composition are not consumed in the hydrolysis of the polyester fibers, making their concentration less likely to decrease. This is thought to have prevented a decrease in the virus inactivation effect caused by making the aqueous composition alkaline. However, the present invention is not limited to the above-mentioned mechanism of action.

[0012] [Hard surface cleaning sheet] The present invention relates to an aqueous composition containing (a) 0.5% by mass or more of an organic amine (hereinafter referred to as component (a)), water, and optionally an alkaline agent other than component (a) (hereinafter referred to as component (c)), the aqueous composition having a pH of 9 or more and 14 or less at 25°C; and a nonwoven or woven fabric having a polyester fiber content of 20% by mass or more and 80% by mass or less. In other words, the present invention relates to a wiping and cleaning sheet for hard surfaces, which is obtained by impregnating a nonwoven or woven fabric having a polyester fiber content of 20% by mass or more and 80% by mass or less with the aqueous composition of the present invention. The aqueous composition of the present invention will be described below.

[0013] <Aqueous composition> The aqueous composition of the present invention contains an organic amine as component (a). The organic amine of component (a) is an amine selected from primary amines, secondary amines, and tertiary amines, in which the longest carbon atom in the organic group bonded to the nitrogen atom has 6 or less carbon atoms. From the viewpoint of preventing a decrease in the virus inactivation effect, alkanolamines are preferred, and alkanolamines having one to three hydroxyalkyl groups having 2 to 4 carbon atoms bonded to the nitrogen atom and in which a methyl group, ethyl group, or propyl group may be bonded to the nitrogen atom are more preferred. From the viewpoint of preventing a decrease in the virus inactivation effect, the alkanolamine is preferably one or more selected from monoethanolamine, diethanolamine, triethanolamine, aminomethylpropanol, N-methylmonoethanolamine, N-methyldiethanolamine, and N,N-dimethylmonoethanolamine, more preferably one or more selected from monoethanolamine and aminomethylpropanol, and even more preferably monoethanolamine.

[0014] The aqueous composition of the present invention contains component (a) in an amount of 0.5% by mass or more, preferably 0.7% by mass or more, and more preferably 1% by mass or more, of the aqueous composition from the viewpoints of maintaining alkaline cleaning power and suppressing a decrease in virus inactivation effect, and preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 2% by mass or less, from the viewpoint of suppressing wiping streaks after wiping.

[0015] The aqueous composition of the present invention may further contain a quaternary ammonium salt-type cationic surfactant as component (b) from the viewpoint of not only improving the detergency due to surfactant activity but also improving antibacterial, bactericidal, and virus inactivating effects, and even non-enveloped virus inactivating effects. The quaternary ammonium salt-type cationic surfactant is a quaternary ammonium salt-type cationic surfactant in which, among the groups bonded to the nitrogen atom, one or two are hydrocarbon groups having from 8 to 20 carbon atoms, preferably from 10 to 18 carbon atoms, and more preferably from 10 to 14 carbon atoms, preferably alkyl or alkenyl groups, and the remaining groups are groups selected from the group consisting of alkyl groups having from 1 to 3 carbon atoms, hydroxyalkyl groups having from 1 to 3 carbon atoms, and arylalkyl groups (e.g., benzyl groups), preferably methyl groups, ethyl groups, and benzyl groups. Among these, quaternary ammonium salt-type cationic surfactants having antibacterial properties and detergency are preferred, and quaternary ammonium salt-type cationic surfactants having a benzyl group are preferred from the viewpoint of antibacterial properties.

[0016] The quaternary ammonium salt cationic surfactant of component (b) is preferably one or more quaternary ammonium salts selected from the group consisting of quaternary ammonium salts represented by the following general formula (1b) and quaternary ammonium salts represented by the following general formula (2b), from the viewpoint of improving antibacterial, bactericidal and virus inactivating effects, and further the non-enveloped virus inactivating effect:

[0017] [ka]

[0018] [In the formula, R 1b is a hydrocarbon group having 8 to 20 carbon atoms, and R 2b and R 3b are each independently a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms, and X - is an anion.

[0019] [ka]

[0020] [In the formula, R 4b is a hydrocarbon group having 8 to 20 carbon atoms, and R 5b is a group selected from a hydrocarbon group having 8 to 20 carbon atoms, an alkyl group having 1 to 3 carbon atoms, and a hydroxyalkyl group having 1 to 3 carbon atoms, and R 6b and R 7b are each independently a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms, and X - is an anion.

[0021] In general formula (1b), R 1b is a hydrocarbon group, preferably an alkyl or alkenyl group, more preferably an alkyl group, having a carbon number of preferably 10 or more, preferably 12 or more, and preferably 18 or less, more preferably 16 or less, from the viewpoint of improving antibacterial, bactericidal and virus inactivating effects, and further improving non-enveloped virus inactivating effects. In addition, in the general formula (1b), R 2b , R 3b are each independently a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms, preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 to 2 carbon atoms, and even more preferably a methyl group. In addition, X in general formula (1b) - is preferably a halogen ion such as a chloride ion, more preferably a chloride ion (Cl - )

[0022] In general formula (2b), R 4b is a hydrocarbon group, preferably an alkyl or alkenyl group, more preferably an alkyl group, having a carbon number of preferably 8 or more, more preferably 10 or more, and preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less, from the viewpoint of improving antibacterial, bactericidal and virus inactivating effects, and furthermore, non-enveloped virus inactivating effects. In addition, in the general formula (2b), R 5b is a hydrocarbon group having 8 to 20 carbon atoms, R 15d is a hydrocarbon group, preferably an alkyl or alkenyl group, more preferably an alkyl group, having a carbon number of preferably 10 or more and preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less, from the viewpoint of improving antibacterial, bactericidal and virus inactivating effects, and furthermore, non-enveloped virus inactivating effects. In addition, in the general formula (2b), R 5b is an alkyl group having 1 to 3 carbon atoms, R 15d is preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 to 2 carbon atoms, and even more preferably a methyl group. In addition, in the general formula (2b), R 6b , R 7b are each independently a group selected from an alkyl group having 1 to 3 carbon atoms and a hydroxyalkyl group having 1 to 3 carbon atoms, preferably an alkyl group having 1 to 3 carbon atoms, more preferably an alkyl group having 1 to 2 carbon atoms, and even more preferably a methyl group. In addition, X in general formula (2b) - is preferably a halogen ion such as a chloride ion, more preferably a chloride ion (Cl - )

[0023] When the aqueous composition of the present invention contains component (b), from the viewpoints of maintaining cleansing properties and improving the virus inactivation effect, and further the non-enveloped virus inactivation effect and antibacterial properties, the aqueous composition contains component (b) in an amount of preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.2% by mass or more, and preferably 5% by mass or less, more preferably 2% by mass or less, even more preferably 1% by mass or less. In the present invention, the mass of component (b) is expressed as a value converted into a chlorine salt.

[0024] When the aqueous composition of the present invention contains component (b), the mass ratio (a) / (b) of the content of component (a) to the content of component (b) is, from the viewpoint of improving the antibacterial, bactericidal, and virus inactivating effects, and further the non-enveloped virus inactivating effect, preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, and preferably 50 or less, more preferably 30 or less, even more preferably 10 or less, still more preferably 8 or less, and still more preferably 6 or less.

[0025] The aqueous composition of the present invention may optionally contain component (c), which is an alkaline agent other than component (a), from the viewpoint of suppressing a decrease in wipe-cleaning properties, antibacterial, bactericidal, and virus inactivating effects. Component (c) is optionally contained in order to adjust the pH of the aqueous composition of the present invention to a specific range.

[0026] The alkaline agents other than component (a) are inorganic alkaline agents. The inorganic alkaline agent is, for example, one or more selected from alkali metal hydroxides, alkali metal carbonates, and silicates. The alkali metal hydroxide is, for example, at least one selected from lithium hydroxide, sodium hydroxide, and potassium hydroxide, and at least one selected from sodium hydroxide and potassium hydroxide is preferred. The alkali metal carbonate is, for example, one or more selected from sodium carbonate, potassium carbonate, lithium carbonate, sodium hydrogen carbonate, and potassium hydrogen carbonate. The silicate is, for example, one or more selected from sodium silicate and potassium silicate, more specifically, one or more selected from sodium metasilicate, sodium orthosilicate, No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate, No. 4 sodium silicate, 1K potassium silicate, and 2K potassium silicate.

[0027] When the aqueous composition of the present invention contains component (c), the aqueous composition contains component (c) in an amount of preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, from the viewpoints of suppressing wiping streaks and suppressing a decrease in antibacterial, bactericidal, and virus inactivating effects, and preferably 3% by mass or less, more preferably 2% by mass or less, and even more preferably 1% by mass or less, from the viewpoint of suppressing wiping streaks after wiping and cleaning. When the aqueous composition of the present invention contains an alkali metal hydroxide as the alkaline agent of component (c), or when the aqueous composition contains an acid, the remaining alkali metal ions not consumed by the counter ions derived from the acid are included in the content of component (c).

[0028] When the aqueous composition of the present invention contains component (c), the mass ratio (a) / (c) of the content of component (a) to the content of component (c) is, from the viewpoint of suppressing a decrease in the virus inactivation effect, preferably 0.1 or more, more preferably 0.5 or more, even more preferably 1 or more, still more preferably 5 or more, and preferably 50 or less, more preferably 30 or less, even more preferably 20 or less, and still more preferably 10 or less.

[0029] The aqueous composition of the present invention may contain a surfactant other than component (b) (hereinafter referred to as component (d)) from the viewpoint of improving cleaning properties and suppressing wiping streaks after wiping. Component (d) is one or more selected from anionic surfactants, nonionic surfactants, and amphoteric surfactants. Component (d) may also contain cationic surfactants other than quaternary ammonium salt-type cationic surfactants.

[0030] The anionic surfactant is, for example, one or more selected from aromatic sulfonates having a hydrocarbon group with from 8 to 18 carbon atoms, alkyl or alkenyl sulfate ester salts having an alkyl or alkenyl group with from 8 to 18 carbon atoms, polyoxyalkylene alkyl or alkenyl ether sulfate ester salts having an alkyl or alkenyl group with from 8 to 18 carbon atoms, and fatty acid salts having from 8 to 18 carbon atoms. The aromatic sulfonate has a hydrocarbon group, preferably an alkyl group, having 8 or more carbon atoms, preferably 10 or more carbon atoms, and 18 or less carbon atoms, preferably 14 or less carbon atoms. Specific examples of the aromatic sulfonate include one or more selected from alkylbenzene sulfonates and alkyldiphenyl ether sulfonates. The alkyl or alkenyl sulfate salt has an alkyl or alkenyl group having 8 or more, preferably 10 or more, carbon atoms and 18 or less, preferably 14 or less. The polyoxyalkylene alkyl or alkenyl ether sulfate salts have alkyl or alkenyl groups having 8 or more carbon atoms, preferably 10 or more, and 18 or less, preferably 14 or less. The polyoxyalkylene alkyl or alkenyl ether sulfate salts have an oxyalkylene group having preferably 2 or 3 carbon atoms, more preferably 2, and an average number of moles of oxyalkylene groups added of 0.5 or more, more preferably 1.0 or more, and 4.0 or less, preferably 3.0 or less. The fatty acid salt has 8 or more, preferably 10 or more, and 18 or less, preferably 14 or less, carbon atoms. Examples of salts of these anionic surfactants include alkali metal salts such as sodium salts or potassium salts, and ammonium salts.

[0031] The nonionic surfactant is, for example, one or more nonionic surfactants selected from amine oxide surfactants, glycoside nonionic surfactants, polyoxyalkylene monoalkyl or alkenyl ether nonionic surfactants, polyhydric alcohol fatty acid ester or polyhydric alcohol alkyl ether nonionic surfactants, and alkanolamide nonionic surfactants. From the viewpoint of cleansing ability and suppressing wiping streaks after wiping, one or more surfactants selected from amine oxide surfactants and glycoside nonionic surfactants are preferred. The polyhydric alcohol fatty acid ester or polyhydric alcohol alkyl ether nonionic surfactants may also contain a glycoside nonionic surfactant.

[0032] The amine oxide surfactant is, for example, an amine oxide having at least one alkyl or alkenyl group having from 8 to 18 carbon atoms, and the remaining hydrocarbon group of the amine oxide preferably has from 1 to 3 carbon atoms, and is preferably a methyl group. The alkyl group may be a compound bonded to the amine via an amidopropyl group. Specific examples include alkyldimethylamine oxides and alkylamidopropyldimethylamine oxides having an alkyl group having from 8 to 18, preferably 14 to 12, carbon atoms, preferably a linear alkyl group.

[0033] From the viewpoint of improving detergency and suppressing the formation of wiping streaks after wiping, the glycoside nonionic surfactant is preferably a glycoside nonionic surfactant having, for example, a hydrocarbon group with 8 or more carbon atoms, preferably 10 or more carbon atoms, and 18 or less carbon atoms, preferably 14 or less carbon atoms, preferably an alkyl or alkenyl group, more preferably an alkyl group, and having an average degree of monosaccharide condensation of preferably 1 or more, preferably 3 or less, more preferably 2 or less, and even more preferably 1.5 or less.

[0034] The glycoside-type nonionic surfactant is preferably a compound represented by the following general formula (1d). R 1d (OR 2d ) x G y (1d) [In the formula, R 1d represents a hydrocarbon group having 8 to 20 carbon atoms, and R 2d represents an alkylene group having 2 to 4 carbon atoms, G represents a residue derived from a monosaccharide having 5 or 6 carbon atoms, x represents a number whose average value is 0 to 5, and y represents a number whose average value is 1 to 3. 1d OR 2d The bond between G and the group (I) is preferably an ether bond or an ester bond.

[0035] In the above general formula (1d), R 1dFrom the viewpoint of improving cleaning properties and suppressing streaks after wiping, R is a hydrocarbon group having 8 or more carbon atoms, preferably 10 or more carbon atoms, and 18 or less carbon atoms, preferably 14 or less carbon atoms, preferably an alkyl group or an alkenyl group, more preferably an alkyl group. 2d The alkylene group represented by is preferably one having two carbon atoms. The structure of the residue derived from a sugar having five or six carbon atoms represented by G is determined depending on the monosaccharide or disaccharide or higher sugar used. G is preferably a residue derived from one or more monosaccharides selected from glucose, galactose, xylose, mannose, lyxose, arabinose, and fructose, and a residue derived from one or more disaccharides or higher sugars selected from maltose, xylobiose, isomaltose, cellobiose, gentiobiose, lactose, sucrose, nigerose, turanose, raffinose, gentianose, and menzitose. Among these, preferred raw materials are one or more monosaccharides selected from glucose and fructose, and one or more disaccharides or higher sugars selected from maltose and sucrose, in terms of detergency, availability, and low cost.

[0036] In addition, x in the general formula (1d) is OR 2d is the average number of moles added, and is preferably 0 or more, and preferably 5 or less, more preferably 3 or less, further preferably 1 or less, and may also be 0.

[0037] Furthermore, when the average value of y in the above general formula (1d) is greater than 1, that is, when the glycoside-type nonionic surfactant has a sugar chain of disaccharide or more as the hydrophilic group, the sugar chain bond type can include 1-2, 1-3, 1-4, 1-6 bond, α-, β-pyranoside bond, furanoside bond, or any mixture of these bond types.

[0038] The average value of y in the general formula (1d) is 1 or more and 3 or less, preferably 2 or less, and more preferably 1.5 or less. The value of y (average degree of condensation of sugars) is 1The measurement is performed by H-NMR. For a specific measurement method, reference can be made to the method described in JP-A-8-53696, page 6, column 10, line 26 to page 7, column 11, line 15.

[0039] The polyoxyalkylene monoalkyl or alkenyl ether type nonionic surfactant is preferably a nonionic surfactant represented by the following general formula (2d). R 3d O-(AO) n -H (2d) [In the formula, R 3d represents an alkyl or alkenyl group having 8 to 20 carbon atoms, AO represents an alkyleneoxy group having 1 to 3 carbon atoms, and n represents the average number of moles of AO added, which is a number of 1 to 20.

[0040] In general formula (2d), R 3d From the viewpoint of improving detergency, the number of carbon atoms is 8 or more, preferably 10 or more, more preferably 12 or more, and 20 or less, preferably 18 or less, more preferably 16 or less, and even more preferably 14 or less. R 3d From the viewpoint of cleaning properties, is an alkyl group or an alkenyl group, is preferably an alkyl group derived from a higher alcohol, is more preferably a linear or branched alkyl group, and is even more preferably an alkyl group derived from a linear primary alcohol or a linear secondary alcohol. In general formula (2d), AO is preferably an alkyleneoxy group having 2 or more and 3 or less carbon atoms, and more preferably an alkyleneoxy group having 2 carbon atoms, that is, an ethyleneoxy group. In general formula (2d), n is a number of 1 or more, preferably 3 or more, more preferably 5 or more, and 20 or less, preferably 15 or less, more preferably 10 or less, from the viewpoint of improving cleaning properties.

[0041] The polyhydric alcohol fatty acid ester or polyhydric alcohol alkyl ether nonionic surfactant is preferably an ester or ether compound of a fatty acid or aliphatic alcohol having 8 or more carbon atoms, preferably 10 or more, more preferably 12 or more, even more preferably 14 or more, and 20 or less, preferably 18 or less, more preferably 16 or less, and a polyhydric alcohol having 3 to 10 hydroxy groups in the molecule. The polyhydric alcohol is preferably a monosaccharide or oligosaccharide such as glycerin, polyglycerin, pentaerythritol, trimethylolpropane, sorbitan, or sucrose, or an alkylene oxide adduct thereof. The polyhydric alcohol fatty acid ester or polyhydric alcohol alkyl ether nonionic surfactant is preferably one or more selected from sorbitan fatty acid esters and polyoxyethylene sorbitan fatty acid esters. When the polyhydric alcohol fatty acid ester type or polyhydric alcohol alkyl ether type nonionic surfactant contains an alkyleneoxy group, preferably an ethyleneoxy group, the average number of moles added is preferably 3 or more, more preferably 5 or more, even more preferably 10 or more, and still more preferably 15 or more, and 30 or less, preferably 25 or less. In the case of a polyhydric alcohol fatty acid ester, the alkyleneoxy group, preferably the ethyleneoxy group, is preferably added between the alkanoyloxy group or alkenoyloxy group constituting the fatty acid ester and the polyhydric alcohol compound, and in the case of a polyhydric alcohol alkyl ether, it is preferably added between the alkyl ether group and the polyhydric alcohol compound.

[0042] From the viewpoint of improving detergency, the number of carbon atoms in the fatty acid moiety constituting the sorbitan fatty acid ester is 8 or more, preferably 10 or more, more preferably 12 or more, even more preferably 14 or more, and 20 or less, preferably 18 or less, more preferably 16 or less. The fatty acid is a saturated fatty acid or an unsaturated fatty acid, and an unsaturated fatty acid is preferred. From the viewpoint of improving detergency, the average degree of esterification of the sorbitan fatty acid ester is preferably 0.8 or more, more preferably 1 or more, and preferably 3 or less, more preferably 1.5 or less, and even more preferably 1, i.e., a monoester. Examples of sorbitan fatty acid esters include sorbitan monocaprylate, sorbitan monolaurate, sorbitan monooleate, etc. The sorbitan fatty acid ester preferably has a monoester structure as the main structure, but may also contain a diester or triester structure.

[0043] From the viewpoint of improving detergency, the number of carbon atoms in the fatty acid moiety constituting the polyoxyethylene sorbitan fatty acid ester is 8 or more, preferably 10 or more, more preferably 12 or more, even more preferably 14 or more, and 20 or less, preferably 18 or less, more preferably 16 or less. The fatty acid is a saturated fatty acid or an unsaturated fatty acid, and an unsaturated fatty acid is preferred. From the viewpoint of detergency, the average degree of esterification of the polyoxyethylene sorbitan fatty acid ester is preferably 0.8 or more, more preferably 1 or more, and preferably 3 or less, more preferably 1.5 or less, and even more preferably 1, i.e., a monoester. From the viewpoint of improving detergency, the average number of moles of oxyethylene groups added in the polyoxyethylene sorbitan fatty acid ester is preferably 3 or more, more preferably 5 or more, even more preferably 10 or more, still more preferably 15 or more, and preferably 30 or less, more preferably 25 or less. Examples of polyoxyethylene sorbitan fatty acid esters include polyoxyethylene (20) sorbitan monolaurate (saturated fatty acid having 12 carbon atoms, average number of moles of ethylene oxide (hereinafter sometimes referred to as EO) added = 20), polyoxyethylene (20) sorbitan monostearate (saturated fatty acid having 18 carbon atoms, average number of moles of EO added = 20), polyoxyethylene (6) sorbitan monooleate (monounsaturated fatty acid having 18 carbon atoms, average number of moles of EO added = 6), and polyoxyethylene (20) sorbitan monooleate (monounsaturated fatty acid having 18 carbon atoms, average number of moles of EO added = 20).

[0044] The alkanolamide nonionic surfactant is, for example, one or more selected from fatty acid monoethanolamides and fatty acid diethanolamides. The number of carbon atoms in the fatty acid moiety (acyl group) of the fatty acid alkanolamide is preferably 8 or more, more preferably 12 or more, and preferably 18 or less, more preferably 16 or less.

[0045] The amphoteric surfactant is, for example, one or more selected from sulfobetaine surfactants and carbobetaine surfactants, and is preferably a sulfobetaine surfactant having a hydrocarbon group, preferably an alkyl group, having 8 or more, preferably 10 or more, carbon atoms and 18 or less, preferably 14 or less. Examples of amphoteric surfactants include N-alkyl-N,N-dimethylacetic acid betaine, N-alkylamidopropyl-N,N-dimethylacetic acid betaine, N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, N-alkyl-N,N-dimethyl-N-sulfopropylammonium betaine, N-a Preferred are one or more selected from N-alkylamidopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine and N-alkylamidopropyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, and more preferred is N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine (the alkyl groups of these compounds have 8 or more, preferably 10 or more, and 18 or less, preferably 14 or less, carbon atoms).

[0046] When the aqueous composition of the present invention contains component (d), from the viewpoints of cleansing ability and suppression of wiping streaks after wiping, the aqueous composition contains component (d) in an amount of preferably 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and preferably 3% by mass or less, more preferably 1% by mass or less, even more preferably 0.5% by mass or less. When an anionic surfactant is contained as component (d), the mass of the anionic surfactant is expressed as a value converted into the sodium salt. Furthermore, when the aqueous composition of the present invention contains a cationic surfactant other than a quaternary ammonium salt-type cationic surfactant, the content of the quaternary ammonium salt-type cationic surfactant (component (b)) in the cationic surfactant is preferably 90% by mass or more, more preferably 95% by mass or more, even more preferably 99% by mass or more, and still more preferably substantially 100% by mass.

[0047] The aqueous composition of the present invention may contain a base other than component (a), optional component (b), optional component (c), optional component (d), and water. Such additives are compounds used in known liquid detergent compositions for hard surfaces, and specifically may contain a sequestering agent, a short-chain alcohol, a glycol-based solvent, and an aromatic alcohol.

[0048] The aqueous composition of the present invention may contain a sequestering agent as component (e). The sequestering agent is at least one selected from a metal ion exchange agent and an organic chelating agent. In the present invention, an organic chelating agent is preferred, more preferably an organic chelating agent having an acid form molecular weight of 300 or less and having a plurality of at least one of carboxylic acid groups and phosphonic acid groups. Further preferred are at least one selected from organic polycarboxylic acids, organic polyphosphonic acids, organic (poly)phosphono(poly)carboxylic acids, and salts thereof. The organic chelating agent is preferably at least one selected from malic acid, tartaric acid, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), iminodiacetic acid, methylglycinediacetic acid (MGDA), glycine-N,N-diacetic acid derivatives, polyphosphoric acid, etidronic acid (HEDP), phosphonobutanetricarboxylic acid (PBTC), and alkali metal salts thereof. When the aqueous composition of the present invention contains component (e), the aqueous composition contains component (e) in an amount of preferably 0.005% by mass or more, more preferably 0.01% by mass or more, even more preferably 0.1% by mass or more, and preferably 5% by mass or less, more preferably 1% by mass or less, even more preferably 0.5% by mass or less. When the aqueous composition of the present invention contains a sequestering agent as component (e), the mass of component (e) is expressed as the value converted to the acid form. Furthermore, organic chelating agents having a molecular weight exceeding 1,000, which are polymer compounds, such as polycarboxylic acids or salts thereof, e.g., polyacrylic acid polymers or salts thereof, are not included in component (e).

[0049] From the viewpoint of easy volatilization on hard surfaces and excellent cleaning properties, the aqueous composition of the present invention preferably contains, as component (f), one or more selected from monohydric or dihydric alcohols and glycol solvents. Component (f) can be one or more selected from methanol, ethanol, propanol, ethylene glycol, propylene glycol, diethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, and propylene glycol monoethyl ether, with one or more selected from ethylene glycol monomethyl ether and propylene glycol monomethyl ether being preferred.

[0050] When the aqueous composition of the present invention contains component (f), the aqueous composition contains component (f) in an amount of preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 0.5% by mass or more, still more preferably 1% by mass or more, and preferably 20% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less.

[0051] The aqueous composition of the present invention may contain (g) an aromatic alcohol for the purpose of virus inactivation. When used in combination with (d) a cationic surfactant, the virus inactivation ability is further improved, and the composition is also highly effective in inactivating non-enveloped viruses.

[0052] In addition to having virus inactivating properties, component (g) of the present invention has a CLogP of preferably 0.5 or more, more preferably 1 or more, and preferably 2.5 or less, more preferably 2 or less, even more preferably 1.5 or less, and even more preferably 1.4 or less, from the viewpoint of not leaving streaks when wiped off with a cloth or when impregnated into a woven fabric or nonwoven fabric sheet. Furthermore, it is an aromatic alcohol having a molecular weight of preferably 50 or more, more preferably 80 or more, and preferably 300 or less, more preferably 200 or less, and even more preferably 170 or less. For example, consider the following aromatic alcohols (the numbers in parentheses are ClogP values): The component (g) of the present invention is, for example, one or more selected from benzyl alcohol (1.104), 2-phenoxyethanol (1.188), 2-methylbenzyl alcohol (1.553), 3-methylbenzyl alcohol (1.603), 4-methylbenzyl alcohol (1.603), 1-phenyl-1-propanol (1.942), 1-(p-tolyl)ethanol (1.912), 1-hydroxyindane (1.518), 3-phenyl-1-propanol (1.712), cinnamyl alcohol (1.608), 2-phenylethanol (1.333), 2-hydroxyindane (1.218), and 1,2-dihydroxyindane (0.356), and from the viewpoint of blendability (ease of solubility in water), is preferably one or more selected from benzyl alcohol (1.104) and 2-phenoxyethanol (1.188).

[0053] CLogP is an estimated value of the affinity of an organic compound for water and 1-octanol [P = (concentration of the organic compound in the 1-octanol phase) / (concentration of the organic compound in the aqueous phase)], and can be calculated using a calculation program that uses fragment values ​​of atomic groups determined by the number of atoms constituting the compound molecule and the type of chemical bond. In the present invention, CLogP calculated using ChemDraw ver. 22.2 from PerkinElmer is used.

[0054] When the aqueous composition of the present invention contains component (g), the component (g) is preferably contained in an amount of 0.5% by mass or more in the composition, and from the viewpoint of the base odor of the composition, preferably 8% by mass or less, more preferably 5% by mass or less, even more preferably 3% by mass or less, and even more preferably 1% by mass or less.

[0055] The aqueous composition of the present invention may contain, in addition to the above-mentioned components, to the extent that the object of the present invention is not impaired, enzymes (protease, fat-splitting enzyme, carbohydrate-splitting enzyme, etc.), hydrotropes other than the above-mentioned solvents such as sodium paratoluenesulfonate, dispersants such as polyacrylates, viscosity modifiers such as xanthan gum, colorants, antioxidants such as BHA, antibacterial and antifungal agents commercially available under trade names such as Proxel BDN (trademark), known foam inhibitors such as silicones, bleaching agents such as hypochlorite and hydrogen peroxide, bleach activators, pH adjusters such as inorganic acids, ultraviolet absorbers, colorants, known fragrances, and the like (however, components corresponding to components (a), (b), (c), (d), (e), and (f) are excluded).

[0056] The aqueous composition of the present invention contains water. The water is not particularly limited, but examples include tap water, well water, deionized water, distilled water, etc., with deionized water being preferred. Water is preferably used in an amount that makes up the remainder of the composition (amounts that total 100% by mass). The aqueous composition of the present invention contains water in an amount of preferably 85% by mass or more, more preferably 90% by mass or more, and preferably 99.9% by mass or less, more preferably 99.3% by mass or less. Water may be the remainder of the aqueous composition.

[0057] The aqueous composition of the present invention has excellent wipe-cleanability and, from the viewpoint of improving the non-enveloped virus inactivation effect, a pH at 25°C of 9 or more, preferably 10 or more, more preferably 11 or more, and even more preferably 12 or more, and, from the viewpoint of preventing a decrease in the virus inactivation effect, a pH of 14 or less, preferably 13.5 or less, more preferably 13 or less, and more preferably 12.5 or less. In particular, this pH is measured by the following method. (1) pH measurement method A pH measurement composite electrode (Horiba, Ltd., glass-ground sleeve type) with a saturated potassium chloride aqueous solution (3.33 mol / L) as the pH electrode internal solution was connected to a pH meter (Horiba, Ltd., pH / ion meter F-23). ​​Next, 100 mL of pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) were each filled into a beaker and immersed in a thermostatic bath at 25°C for 30 minutes. The pH measurement electrode was immersed in the thermostatically adjusted standard solution for 3 minutes, and calibration was performed in the order pH 6.86 → pH 9.18 → pH 4.01. The aqueous composition to be measured was adjusted to 25°C, and the electrode of the pH meter was immersed in the sample. The pH was measured after 1 minute.

[0058] From the viewpoint of ease of wiping, the viscosity of the aqueous composition of the present invention at 25°C is preferably 1 mPa s or more, more preferably 1.5 mPa s or more, even more preferably 2 mPa s or more, and preferably 10 mPa s or less, more preferably 8 mPa s or less, even more preferably 5 mPa s or less. This viscosity is measured using a Brookfield viscometer. The viscosity is measured using a Brookfield viscometer, using one of the No. 1 to No. 3 rotors that matches the viscosity of the object to be measured, at 60 r / min, and the reading is the reading one minute after the start of measurement. The aqueous composition is measured at a temperature of 25±1°C. If there are multiple rotors that meet the conditions, the value measured using the rotor with the smaller number is used.

[0059] <Wipe Cleaning Sheet> The nonwoven fabric or woven fabric used in the hard surface wiping and cleaning sheet of the present invention is processed into a sheet, and the fibers constituting the nonwoven fabric or woven fabric contain polyester-based fibers.

[0060] The polyester fibers include aromatic polyester fibers such as polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, and aliphatic polyester fibers such as polylactic acid and polyglycolic acid, and one or more of these can be used. From the viewpoint of improving the rigidity during wiping, the polyester fiber is preferably one or more selected from polyethylene terephthalate, polytrimethylene terephthalate, and polybutylene terephthalate, and more preferably polyethylene terephthalate.

[0061] The content of polyester fibers in the nonwoven fabric or woven fabric is 20% by mass or more, preferably 25% by mass or more, and 80% by mass or less, preferably 70% by mass or less, and more preferably 50% by mass or less, from the viewpoint of preventing a decrease in stiffness and virus inactivation effect when wiped clean.

[0062] The fibers constituting the nonwoven fabric or woven fabric may be composed of hydrophilic fibers, except for hydrophilized polyester fibers (polyester fibers that have been hydrophilized and have a moisture regain under standard conditions within the range of hydrophilic fibers described below). The fibers constituting the nonwoven fabric or woven fabric may contain hydrophobic fibers other than polyester fibers. In the present invention, hydrophilic fibers refer to fibers whose moisture regain under standard conditions (20°C, 65% RH) exceeds 5%. The moisture regain under standard conditions is measured by the method specified in JIS L1013 and JIS L1015. Hydrophobic fibers refer to fibers whose moisture regain under standard conditions (20°C, 65% RH) is 5% by mass or less.

[0063] Hydrophilic fibers include seed hair fibers (cotton, cotton, kapok, etc.), bast fibers (hemp, flax, ramie, hemp, jute, etc.), leaf vein fibers (Manila hemp, sisal, etc.), palm fibers, rush, straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuna, angora, etc.), silk fibers (domestic silk, wild silk), feathers, and cellulosic fibers (rayon, polynosic, cupra, acetate, etc.), and these can be used alone or in combination of two or more.

[0064] Examples of hydrophobic chemical fibers other than polyester fibers include polyamide fibers (such as nylon), polyacrylonitrile fibers (such as acrylic), polyvinyl alcohol fibers (such as vinylon), polyvinyl chloride fibers (such as polyvinyl chloride), polyvinylidene chloride fibers (such as vinylidene), polyolefin fibers (such as polyethylene and polypropylene), polyurethane fibers (such as polyurethane), and polyvinyl chloride / polyvinyl alcohol copolymer fibers (such as polycrelal), and these may be used alone or in combination.

[0065] When the fibers constituting the nonwoven fabric or woven fabric contain hydrophilic fibers, the content of hydrophilic fibers in the nonwoven fabric or woven fabric is preferably 20% by mass or more, more preferably 30% by mass or more, even more preferably 50% by mass or more, and preferably 80% by mass or less, more preferably 75% by mass or less, even more preferably 70% by mass or less, from the viewpoint of preventing a decrease in the feel when wiped clean and a decrease in the virus inactivation effect.

[0066] When the fibers constituting the nonwoven fabric or woven fabric contain hydrophobic fibers other than polyester-based fibers, the content of hydrophobic fibers other than polyester-based fibers in the nonwoven fabric or woven fabric is preferably 10% by mass or more, more preferably 15% by mass or more, even more preferably 20% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, even more preferably 30% by mass or less, from the viewpoint of stiffness and feel when wiped clean.

[0067] The basis weight of the nonwoven or woven fabric is preferably 10 g / m 2 More preferably, 20 g / m 2 or more, and preferably 100 g / m 2 Less than 80 g / m 2 More preferably 60 g / m or less 2 Below are the results.

[0068] The mass ratio of the aqueous composition of the present invention to the mass of the nonwoven fabric or woven fabric (pickup rate (mass %)) is preferably 100 mass % or more, more preferably 150 mass % or more, and preferably 250 mass % or less, more preferably 200 mass % or less. From the viewpoint of exerting a wiping effect, the pick-up rate is preferably 100 mass % or more, and from the viewpoint of preventing moisture from entering the interior of precision equipment such as keyboards, the pick-up rate is preferably 250 mass % or less. The pick-up rate is calculated using the following formula. Impregnation rate (mass%)=((mass of nonwoven or woven fabric impregnated with aqueous composition) / (mass of dry nonwoven or woven fabric)−1)×100

[0069] The hard surfaces targeted by the wiping and cleaning sheet for hard surfaces of the present invention include hard surfaces such as floors, walls, ceilings, and furniture in living areas such as living rooms, rooms, kitchens, bathrooms, and toilets. In particular, the wiping and cleaning sheet for hard surfaces of the present invention maintains its alkaline cleaning power before and after storage (for example, storage for one year or more at room temperature), suppresses a decrease in its antibacterial, bactericidal, and virus inactivating effects, and can achieve good virus inactivation effects, making it suitable for use on hard surfaces such as floors, walls, ceilings, furniture, tools, and equipment in facilities that require a high level of hygiene management, such as hospitals or nursing homes.

[0070] The hard surface wiping and cleaning sheet of the present invention can be used against various viruses, including enveloped and non-enveloped viruses.

[0071] Enveloped viruses have a viral envelope that surrounds their protein capsid. Enveloped viruses can be classified as DNA viruses (single-stranded or double-stranded), RNA viruses, or reverse-transcription viruses. Examples of enveloped viruses include, but are not limited to, Herpesviridae (e.g., herpes simplex virus, varicella-zoster virus, cytomegalovirus, Epstein-Barr virus), Hepadnaviridae (e.g., hepatitis B virus), Togaviridae (e.g., rubella virus), Arenaviridae (e.g., lymphocytic choriomeningitis virus), Flaviviridae (e.g., dengue virus, hepatitis C virus, yellow fever virus), Orthomyxoviridae (e.g., influenza virus A, influenza virus B, influenza virus C, Isaac virus), and others. virus, Thogotovirus), Paramyxoviridae (e.g., measles virus, mumps virus, respiratory syncytial virus, rinderpest virus, canine distemper virus), Bunyaviridae (e.g., California encephalitis virus, Hantavirus), Filoviridae (e.g., Ebola virus, Marburg virus), Coronaviridae (e.g., coronavirus), Astroviridae (e.g., astrovirus), Bornaviridae (e.g., Borna disease virus), and Arteriviridae (e.g., arterivirus, equine arteritis virus).

[0072] Non-enveloped viruses include non-enveloped single-stranded (+) RNA viruses, single-stranded (-) RNA viruses, double-stranded RNA viruses, single-stranded DNA viruses, and double-stranded DNA viruses, such as viruses belonging to the Caliciviridae, Picornaviridae, Parvoviridae, Papillomaviridae, Polyomaviridae, and Adenoviridae families.

[0073] [Virus inactivation method] The present invention provides a method for inactivating viruses, which comprises wiping a hard surface on which a virus is present or is suspected to be present with the hard surface wiping sheet of the present invention. In the virus inactivation method of the present invention, the hard surface and viruses to be inactivated are the same as those described for the hard surface wiping sheet of the present invention. The virus inactivation method of the present invention can be suitably applied to the embodiments described for the wiping and cleaning sheet for hard surfaces of the present invention.

[0074] The virus inactivation method of the present invention involves pressing the hard surface wiping and cleaning sheet of the present invention against a target hard surface on which a virus is present or is thought to be present, and applying an external force by hand or the like within a range that does not damage the part to be cleaned, thereby transferring dirt adhering to the part to be cleaned to the wiping and cleaning sheet, which may be done by rubbing, kneading, or tapping. [Example]

[0075] The components used in the examples and comparative examples are listed below.

[0076] <Component (a)> Monoethanolamine: Nippon Shokubai Co., Ltd. 2-Amino-2-methyl-1-propanol: Fujifilm Wako Pure Chemical Industries, Ltd.

[0077] <(b) Component> Benzalkonium chloride: manufactured by Kao Corporation, in the general formula (1b), R 1b is an alkyl group having 12 to 16 carbon atoms, R 2b and R 3b is a methyl group, X - is a chloride ion (product name: Sanisol B-50) Dodecyltrimethylammonium chloride: manufactured by Kao Corporation. In general formula (2b), R 4b is an alkyl group having 12 carbon atoms, R 5b , R 6b , and R 7b is a methyl group, X - is a chloride ion (product name: Kotamin 20W)

[0078] <(c) component> Sodium hydroxide Potassium hydroxide Sodium carbonate <(g) component> Benzyl alcohol: ClogP1.104, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. Phenoxyethanol: 2-phenoxyethanol, ClogP1.118, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. <Other ingredients> Sulfuric acid (used to adjust pH)

[0079] <Base sheet> The substrate sheet used was the following nonwoven fabric. Substrate 1: Taketora Co., Ltd. (product name: Centrarch II), containing polyethylene terephthalate (PET) fiber and rayon fiber, with a polyethylene terephthalate (PET) fiber content of 30% by mass, and a basis weight of approximately 30 g / m 2 Substrate 2: A substrate containing polyethylene terephthalate (PET) fibers, rayon fibers, and hydrophobic fibers other than PET, with a polyethylene terephthalate (PET) fiber content of 25% by mass, and a basis weight of approximately 40 g / m 2 Substrate 3: Manufactured by Imamura Paper Co., Ltd. (product name: FF-KM300), containing polyethylene terephthalate (PET) fiber and rayon fiber, with a polyethylene terephthalate (PET) fiber content of 70% by mass, and a basis weight of approximately 40 g / m 2 Substrate 4: A substrate containing polyethylene terephthalate (PET) fibers, with a polyethylene terephthalate (PET) fiber content of 100% by mass, and a basis weight of approximately 40 g / m 2

[0080] [Manufacturing method for wiping and cleaning sheets for hard surfaces] A stirrer and purified water were placed in a beaker, and while stirring the purified water, component (a), component (b), and component (c) were added to the mixture in the amounts shown in Tables 1 to 3. Next, sulfuric acid was added to the mixture as a pH adjuster, if necessary, and the mixture was stirred until it reached room temperature, producing each of the aqueous compositions shown in Tables 1 to 3. Furthermore, each substrate sheet (each consisting of 40 sheets of nonwoven fabric cut to 10 cm x 20 cm and stacked together) was impregnated with each of the aqueous compositions to achieve the impregnation ratio shown in Tables 1 to 3 ((mass of nonwoven fabric or woven fabric impregnated with the aqueous composition) / (mass of dried nonwoven fabric or woven fabric)-1) x 100), to produce wiping and cleaning sheets for hard surfaces. The content of component (c) in the aqueous composition shown in each table is the concentration after subtracting the amount neutralized by pH adjustment with sulfuric acid.

[0081] [pH measurement evaluation of hard surface cleaning sheets before and after storage] An accelerated storage test was conducted to confirm the long-term storage stability of the pH of hard surface wipes under typical conditions (e.g., storage for one year or more at room temperature). Each hard surface wipe was stored in a thermostatic chamber (PL-2J, manufactured by Espec Corporation) set to 60°C and removed after three days. Each stored hard surface wipe was placed in a syringe with tweezers and pushed out to squeeze out the impregnation solution. The pH of the squeezed impregnation solution after storage was measured at 25°C. Similarly, each hard surface wipe was placed in a syringe with tweezers and pushed out to squeeze out the impregnation solution before storage, and the pH of the impregnation solution before storage was measured at 25°C. The results are shown in Tables 1 to 3. The smaller the difference in pH of the impregnation solution before and after storage, the better the long-term storage stability (e.g., storage for one year or more at room temperature) and the more effectively the virus inactivation effect of the aqueous composition contained in the hard surface wipe was reduced by making it alkaline.

[0082] [Evaluation of non-enveloped virus inactivation before and after storage] Preparation of bacterial suspension Escherichia coli NBRC 13965 (provided by NBRC) was inoculated onto standard agar medium (manufactured by Nissui Pharmaceutical) and cultured overnight at 37°C. 12 mL of LB medium (BD Difco LB Broth, Lennox) was dispensed into a cell culture flask, and the resulting single colony was suspended and cultured overnight with shaking at 37°C and 200 rpm. 12 mL of LB medium was dispensed into a new cell culture flask, and 100 μL of the resulting culture was added. Culture was continued at 37°C and 200 rpm until the OD600 reached 0.3-0.4, preparing a bacterial suspension for use in preparing double-plate agar medium.

[0083] (2) Preparation of double agar plates A lower agar plate was prepared by pouring 25 mL of autoclaved LB agar medium (agar concentration 1.5% by mass) into a square Petri dish (120 × 120 × 17 mm, Greiner Japan Co., Ltd.) and allowing it to cool and harden. 4.0 mL of the bacterial solution prepared in (1) was added to 36 mL of autoclaved LB soft agar medium (agar concentration 0.6% by mass) that had been kept warm at 50°C, and the mixture was stirred quickly. 15 mL of the mixture was poured onto the lower agar plate prepared earlier to prepare a double agar plate.

[0084] (3) Contact between the impregnation solution and the virus before and after storage An accelerated storage test was conducted to confirm the long-term storage stability of the virus inactivation effect of hard surface wipes under typical conditions (e.g., storage for more than one year at room temperature). Each hard surface wipe was stored in a thermostatic chamber (Espec Corporation, PL-2J) set to 60°C and removed after three days. After storage, each hard surface wipe was placed in a syringe with tweezers and pushed out, squeezing out the impregnating solution after storage. Similarly, each hard surface wipe was placed in a syringe with tweezers and pushed out, squeezing out the impregnating solution before storage. To each 1.5 mL plastic tube containing 900 μL of each impregnation solution before and after storage, 100 μL of Escherichia coli phage MS2 NBRC 102619 (distributed by NBRC) at 1.0 × 10 pfu / mL suspended in SM buffer containing 5.0% bovine serum albumin (Fujifilm Wako Pure Chemical Industries, Ltd.) was added, vortexed thoroughly, and then allowed to stand for 30 seconds to allow contact between each impregnation solution and the virus. A 100 μL aliquot of the mixture was added to 900 μL of neutralization medium to terminate contact between each impregnation solution and the virus. The mixture was then serially diluted (10-1,000,000-fold) with SM buffer to prepare samples for spot testing. Control samples were also prepared by performing the same procedure using SM buffer instead of each impregnation solution.

[0085] (4) Evaluation of virus inactivation effect by spot test 5.0 μL of the sample prepared in (3) was spotted onto the double agar plate prepared in (2) and cultured overnight at 37°C. The dilution ratio at which death (plaques) of E. coli caused by viral infection could no longer be confirmed was confirmed visually, and the virus inactivation effect of each impregnation solution before and after storage was evaluated by comparing with the results of the control sample and measuring the MS2 inactivation effect (Δlog) value shown below. The MS2 inactivation effect (Δlog) is defined by the following formula: MS2 inactivation effect (Δlog) = LogC - LogS C: The dilution ratio at which the death of E. coli in the control sample was no longer confirmed. S: Dilution ratio at which the death of E. coli in the test sample is no longer confirmed The larger the MS2 inactivation effect (Δlog), the greater the virus inactivation effect of each impregnation solution. Furthermore, the smaller the difference in the MS2 inactivation effect (Δlog) of the impregnation solution before and after storage, the better the long-term storage stability (e.g., storage for one year or more at room temperature) and the less the decrease in virus inactivation effect of the hard surface wipes before and after storage. The results are shown in Tables 1 to 3.

[0086] In addition to suppressing the decline in virus inactivation effect, the wiping sheets for hard surfaces of the Examples and Comparative Examples in Tables 1 to 3, when prepared immediately after preparation and within the pH range of the present invention, exhibit good cleaning power for hard surfaces that are alkaline and cannot be removed by ordinary wiping with water, such as stickiness on tables and denatured oil stains around ranges. However, the wiping sheets of the Comparative Examples, which showed a decrease in pH after storage, exhibited reduced cleaning power.

[0087] [Table 1]

[0088] [Table 2]

[0089] [Table 3]

[0090] <Composition example> Examples of compositions of the hard surface wiping and cleaning sheets of the present invention are shown in Table 4. These hard surface wiping and cleaning sheets are able to improve the effect of pH decrease before and after storage (e.g., storage for one year or more at room temperature), maintain their cleaning power, and further suppress the decrease in virus inactivation effect, thereby achieving good cleaning properties and virus inactivation effects.

[0091] [Table 4]

[0092] In Table 4, the components used in the composition examples other than those mentioned above are shown below. <(c) component> Sodium silicate: Fujifilm Wako Pure Chemical Industries, Ltd. <(d) component> Dimethyldodecylamine oxide: manufactured by Kao Corporation (product name: Amphitol 20N) Palm kernel oil fatty acid diethanolamide: Kao Corporation (product name: Aminone PK-02S) Polyoxyethylene sorbitan monolaurate: A compound with an average number of ethylene oxide moles of 20 and an average degree of esterification of 1, manufactured by Kao Corporation (product name: Rheodor TW-L120) Dodecyl glycoside: In general formula (1d), R 1d is a compound in which x is 0, G is a residue derived from glucose, and y is 1, manufactured by Kao Corporation (product name: Mydol 12). Polyoxyethylene lauryl ether: In general formula (2d), R 3d is an alkyl group with 12 carbon atoms, AO is an alkyleneoxy group, and n is 12. This compound is manufactured by Kao Corporation (product name: Emulgen 120). <(e) component> Disodium malate: Fujifilm Wako Pure Chemical Industries, Ltd. Tetrasodium ethylenediaminetetraacetate: Fujifilm Wako Pure Chemical Industries, Ltd. <Component (f)> Ethanol: Fujifilm Wako Pure Chemical Industries, Ltd. Propylene glycol monoethyl ether: Fujifilm Wako Pure Chemical Industries, Ltd.

Claims

1. (a) an aqueous composition containing 0.5% by mass or more of an organic amine (hereinafter referred to as component (a)), water, and optionally an alkaline agent other than component (a) (hereinafter referred to as component (c)), and having a pH of 9 or more and 14 or less at 25°C; A wiping and cleaning sheet for hard surfaces, comprising a nonwoven fabric or a woven fabric having a polyester fiber content of 20% by mass or more and 80% by mass or less.

2. 2. The hard surface wiping and cleaning sheet according to claim 1, wherein component (a) is monoethanolamine.

3. The wiping and cleaning sheet for hard surfaces according to claim 1 or 2, wherein the aqueous composition further contains (b) a quaternary ammonium salt type cationic surfactant.

4. The wiping and cleaning sheet for hard surfaces according to claim 1 or 2, wherein the hydraulic composition further contains (g) an aromatic alcohol.

5. A method for inactivating viruses, comprising wiping a hard surface on which viruses are present or suspected to be present with the hard surface wiping and cleaning sheet for hard surfaces according to claim 1 or 2.

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