Wet sheet and liquid agent

Abstract

To provide a wet sheet and liquid agent having excellent finishing on a target surface to be cleaned and providing high sterilizing, antibacterial, and anti-virus effects.SOLUTION: There is provided a wet sheet having a base material sheet containing a fiber material, and a liquid agent impregnated into the base material sheet. The liquid agent contains the following components (A) to (C): (A) lactic acid, citric acid, malic acid, acetic acid, or a salt of these acids, or a combination of two or more components selected from the acid and salt; (B) a quaternary ammonium salt-type surfactant; and (V) polyglyceryl fatty acid ester. The pH of the liquid agent is 3.0 or more to less than 6.0. Further, the present invention provides a liquid agent containing the above components (A) to (C) and having the pH of 3.0 or more to less than 6.0.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a wet sheet in which a base sheet is impregnated with a liquid preparation, and to the liquid preparation. [Background technology]

[0002] Wet sheets containing disinfectants or alcohol are known. Wet sheets are used to wipe off dirt from hard surfaces such as kitchen areas, tables, furniture, and electrical appliances. Wet sheets containing disinfectants or antibacterial agents release liquid agents onto the target surface to exert their disinfecting and antibacterial properties.

[0003] For example, Patent Document 1 describes a wet sheet using a liquid agent containing an organic acid and a quaternary ammonium salt surfactant. Patent Documents 2 and 3 describe cleaning compositions containing polyglycerol fatty acid esters, which are used to clean dishes, toilet seats, and the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-15413 A [Patent Document 2] JP 2009-173768 A [Patent Document 3] Special Publication No. 2021-530604 Summary of the Invention [Problem to be solved by the invention]

[0005] If the liquid used for wiping remains on the surface to be wiped, and the surface to be wiped is a mirror, dark-colored furniture, or home appliance, white wiping streaks may remain on the surface to be wiped, resulting in poor finish. Therefore, wet wipes in which the liquid is impregnated into the base sheet, and the liquid impregnated into the base sheet, are required to achieve both a finish on the surface to be wiped that is less likely to leave wiping streaks, and antibacterial, germ-killing, and virus-killing properties.

[0006] However, the technology described in Patent Document 1 leaves room for improvement in finish and virus removal properties when wiping mirror surfaces and the like. The techniques described in Patent Documents 2 and 3 give no consideration to achieving both a good finish on the surface to be wiped and a high germ-killing, antibacterial, and antiviral effect. Therefore, an object of the present invention is to provide a wet sheet and liquid preparation which provide a superior finish to the surface to be wiped compared to conventional techniques and which also provide high germ-killing, antibacterial and antiviral effects. [Means for solving the problem]

[0007] The present invention relates to a wet wipe having a base sheet containing a fibrous material and a liquid agent impregnated into the base sheet. In one embodiment, the solution comprises: (A) Lactic acid, citric acid, malic acid, acetic acid, or a salt of these acids, or a combination of two or more selected from these acids and salts. (B) a quaternary ammonium salt surfactant, and It is preferable that the composition contains (C) a polyglycerol fatty acid ester. The present invention also relates to a liquid preparation containing the above-mentioned components (A), (B) and (C). In one embodiment, the liquid preferably has a pH of 3.0 or more and less than 6.0. Effect of the Invention

[0008] The wet sheet and liquid preparation of the present invention are less likely to leave wiping marks after wiping the surface to be wiped, provide excellent finish, and provide high germ-killing, antibacterial, and antiviral effects. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will now be described based on its preferred embodiments. The wet sheet of the present invention comprises a base sheet and a liquid preparation impregnated in the base sheet. The liquid preparation contains the following components (A), (B) and (C). (A) Lactic acid, citric acid, malic acid, acetic acid, or a salt of these acids, or a combination of two or more selected from these acids and salts. (B) Quaternary ammonium salt type surfactant. (C) Polyglycerol fatty acid ester. The liquid preparation of the present invention contains the above-mentioned components (A), (B) and (C). The present inventors have surprisingly discovered that by combining a specific organic acid or salt of component (A), a quaternary ammonium salt type surfactant of component (B), and a polyglycerol fatty acid ester of component (C), it is possible to make it possible to hardly leave wiping streaks after wiping a surface to be wiped, such as a hard surface, to improve the finish of the surface to be wiped, and to achieve both antibacterial, germicidal, and viral disinfecting properties.

[0010] In this specification, "wiping" does not simply mean wiping off dirt and dust, but refers to wiping work in general, and broadly includes wiping work for various purposes such as removing dirt, beautifying, disinfecting, antibacterial, antiviral, etc. Specifically, it includes cleaning of buildings 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.

[0011] First, the liquid in the wet sheet of the present invention and a preferred form of the liquid of the present invention will be described in detail. The liquid agent can ensure antibacterial and disinfecting performance by containing component (A). As described above, component (A) is lactic acid, citric acid, malic acid, acetic acid, or a salt of these acids, or a combination of two or more selected from these acids and salts. Among these, lactic acid or a salt thereof is preferred, which can be imagined as food from the viewpoint of safety. Among lactic acids, fermented lactic acid obtained by fermentation is preferably used, which can be imagined as food from the viewpoint of safety. Examples of salts include alkali metal salts such as potassium and sodium.

[0012] The content of component (A) in the liquid is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, from the viewpoint of imparting high antibacterial properties. Also, from the viewpoint of finish, it is preferably 1.0% by mass or less, more preferably 0.5% by mass or less. The content of component (A) in the liquid is preferably 0.1% by mass or more and 1.0% by mass or less, more preferably 0.2% by mass or more and 0.5% by mass or less. When the acid is used in the form of a salt, the content of component (A) is the amount converted into acid (acid equivalent amount). When two or more kinds of component (A) are contained, the content of component (A) is the total amount of all components (A).

[0013] In the present invention, the liquid formulation can effectively achieve a virus removal effect while improving the finish of the surface to be wiped by using component (B) and component (C) in combination. Component (B) can be a quaternary ammonium salt surfactant represented by the following formula (1).

[0014] [ka]

[0015] 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, 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. 3 and R 4 represent the same or different linear or branched alkyl groups having 1 to 3 carbon atoms, provided that R 2 , R 3 and R 4may be taken together to form a pyridine ring. - indicates an anion that is a counter ion of the ammonium ion.

[0016] In formula (1), R 1 In a preferred embodiment of the above, from the viewpoint of improving hygienic performance such as bacteria removal and virus removal during wiping, a linear or branched alkyl group, a linear or branched alkenyl group, or an arylalkyl group interrupted by an ether group is preferred, and a linear alkyl group is particularly preferred. R 1 From the same viewpoint as above, the number of carbon atoms is preferably 6 or more and 28 or less, and more preferably 8 or more and 18 or less. R 2 From the same viewpoint as above, R is an arylalkyl group such as a benzyl group, or 2 , R 3 and R 4 preferably taken together form a pyridine ring. R 2 , R 3 and R 4 do not form a pyridine ring, R 2 From the same viewpoints as above, the number of carbon atoms is preferably 1 or more and 28 or less, and more preferably 1 or more and 18 or less. R 3 and R 4 From the same viewpoint as above, it is more preferable that the number of ions is 1 or more and 18 or less. A - 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.

[0017] The quaternary ammonium salt is preferably an alkylbenzyldimethylammonium salt from the viewpoint of improving hygienic performance, and is particularly preferably benzalkonium chloride.

[0018] The content of component (B) in the liquid preparation is preferably 0.05% by mass or more, more preferably 0.07% by mass or more, and particularly preferably 0.09% by mass or more, from the viewpoint of imparting high virus removal property, bactericidal property and dirt removal property. Moreover, the content of component (B) in the liquid is preferably 0.4 mass % or less, and more preferably 0.2 mass % or less, from the viewpoint of the finished product. The content of component (B) in the liquid is preferably in the range of 0.05% by mass or more and 0.4% by mass or less, more preferably 0.07% by mass or more and 0.2% by mass or less, and particularly preferably 0.09% by mass or more and 0.2% by mass or less. When two or more kinds of components (B) are contained in the liquid preparation, the content of component (B) is the total amount of all components (B).

[0019] In order to further enhance the antibacterial, bactericidal and antiviral effects, the ratio (A) / (B) of the content of the (A) component to the content of the (B) component is preferably 10 / 1 to 1 / 1, and more preferably 10 / 1 to 3 / 1, in mass ratio.

[0020] The polyglycerol fatty acid ester, which is component (C), is a nonionic surfactant in which the hydrophilic group is polyglycerol and the hydrophobic group is an aliphatic hydrocarbon group in an acyl group. The inventors have found that by combining the polyglycerol fatty acid ester (C) with components (A) and (B), the germicidal and antibacterial properties can be enhanced, and the virus elimination properties can be synergistically enhanced while improving the finish of the surface to be wiped. The reason for the improvement in finish by the polyglycerol fatty acid ester is not clear, but due to the characteristics of the polyglycerol fatty acid ester, which is easily liquid crystalline at low concentrations, and its excellent surface activity, a uniform thin film of the liquid agent can be obtained on the surface to be wiped, and the thin film becomes transparent when dried, which is thought to make it easier to obtain a finished surface without wiping streaks. As a result, in the present invention, even surfaces to be wiped, such as mirrors and dark-colored plastics, which are conventionally prone to visible wiping streaks, can be wiped with good finish, and the combination of components (A) to (C) can effectively achieve germicidal, antibacterial, and virus elimination on the surface to be wiped.

[0021] The polyglycerol fatty acid ester may contain, as the acyl group, either a saturated aliphatic hydrocarbon group or an unsaturated aliphatic hydrocarbon group, or both a saturated aliphatic hydrocarbon group and an unsaturated aliphatic hydrocarbon group. From the viewpoints of improving the finish even when wiping a mirror surface where wiping streaks are easily visible, and of enhancing the virus removal properties, it is preferable that the acyl group in the polyglycerol fatty acid ester has a saturated aliphatic hydrocarbon group or a monovalent unsaturated aliphatic hydrocarbon group.

[0022] In terms of the wettability of the liquid agent, the polyglycerol fatty acid ester preferably has an average polymerization degree of glycerin of 6 or more, and more preferably 8 or more. In particular, in terms of excellent performance of liquid crystallization at low concentrations and excellent finish on mirror surfaces and dark-colored surfaces to be wiped, the polyglycerol fatty acid ester preferably has an average polymerization degree of glycerin of 10 or more. In terms of the transparency of the thin film after drying, the polyglycerol fatty acid ester preferably has an average polymerization degree of glycerin of 20 or less, and particularly preferably 16 or less. In this specification, the term "average degree of polymerization of glycerin" refers to the degree of polymerization of the polyglycerin portion of the polyglycerin fatty acid ester measured by GPC. The average degree of polymerization of glycerin can be measured by the method described below.

[0023] <Method for measuring the average degree of polymerization of glycerin> According to the method described on page 75 of "Polyglycerol Esters" (1994) published by Sakamoto Yakuhin Kogyo Co., Ltd., polyglycerol fatty acid esters are saponified with KOH-ethanol, the pH is adjusted to 4 with dilute sulfuric acid, and the fatty acid portion is extracted with hexane. The aqueous layer is adjusted to pH 7 and desalted with methanol to obtain the polyglycerol portion. The resulting polyglycerol portion is used for analysis of the average degree of polymerization of glycerol, and the fatty acid portion is used for analysis of the constituent fatty acids. Polyglycerin is analyzed by GPC under the following conditions: column: TSK2500PWXL (Tosoh Corporation), solvent: distilled water (with 0.1% trifluoroacetic acid added), flow rate: 1 mL / min, detector: RID, temperature: 40°C, injection volume: 50 μL. A calibration curve is created with polyethylene glycol, and the weight-average molecular weight of polyglycerin (Mw2) and the weight-average molecular weight of glycerin (Mw1) converted to polyethylene glycol are measured. Next, the conversion factor (F) of glycerin is calculated using the following formula (2). F=92 / Mw1 (2) (In the formula, F=glycerin conversion factor, Mw1=weight average molecular weight of glycerin) The "average degree of polymerization of glycerol" of polyglycerol is calculated from the weight average molecular weight (Mw2) calculated above according to the following formula (3). n = (Mw2 × F-18) / 74 (3) (wherein n = weight-average degree of polymerization of glycerol, F = conversion coefficient of glycerol, and Mw2 = weight-average molecular weight of polyglycerol)

[0024] The polyglycerol fatty acid ester is also preferably such that the acyl group contained therein has a carbon atom number minus the double bond number of 12 to 17, which is excellent in terms of liquid crystallization performance at low concentrations and excellent finish on mirror surfaces and dark-colored surfaces to be wiped. Examples of the aliphatic hydrocarbon group having a carbon atom number minus the double bond number of 12 to 17 include acyl groups contained in lauric acid, myristic acid, palmitic acid, palmitoleic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid, etc., and one or more acyl groups contained in organic acids selected from lauric acid, myristic acid, palmitic acid, and oleic acid are particularly preferred in terms of more effectively imparting excellent finish on surfaces to be wiped and easily imparting high antibacterial, germicidal, and viral disinfecting properties.

[0025] In terms of achieving a higher finish on the surface to be wiped, it is most preferable that the polyglycerol fatty acid ester has one bonded fatty acid to the polyglycerol.

[0026] Suitable examples of polyglycerol fatty acid esters include polyglyceryl-10 laurate, polyglyceryl-10 myristate, polyglyceryl-10 palmitate, polyglyceryl-10 oleate, and mixtures thereof.

[0027] Commercially available polyglycerol fatty acid esters can be used, and examples thereof include SANSOFT Q-12Y-C, SANSOFT Q-14Y-C, SANSOFT Q-17Y-C, SANSOFT M-12J, SANSOFT Q-121Y-C, SANSOFT Q-12S-C, SANSOFT Q-14S-C, SANSOFT Q-17S-C manufactured by Taiyo Kagaku Co., Ltd., and NIKKOL Decaglyn 1-PVEX manufactured by Nikko Chemicals Co., Ltd.

[0028] The polyglycerol fatty acid ester preferably has an HLB value of, for example, 12 to 20 in order to obtain even better finish properties, and more preferably has an HLB value of 14 to 18.

[0029] From the viewpoint of imparting high virus removal properties, the content of component (C) in the liquid preparation is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and particularly preferably 0.2% by mass or more. From the viewpoint of improving the finish of the surface to be wiped, the content of component (C) in the liquid is preferably 1 mass % or less, more preferably 0.7 mass % or less, and particularly preferably 0.5 mass % or less. The content of component (C) in the liquid is preferably in the range of 0.05% by mass or more and 1% by mass or less, more preferably 0.1% by mass or more and 0.7% by mass or less, and particularly preferably 0.2% by mass or more and 0.5% by mass or less.

[0030] From the viewpoint of synergistically improving the antibacterial, germicidal, and viral disinfecting properties, and thereby enhancing the effect of improving the finish of the surface to be wiped, the value of (component (A)+component (B)) / component (C), which is the ratio of the sum of the contents of component (A) and component (B) to the content of component (C), is preferably from 1 / 2 to 10 / 1 in mass ratio, and particularly preferably from 1 / 1 to 5 / 1 in mass ratio.

[0031] In particular, from the viewpoint of enhancing the effect of further improving the antiviral properties while improving the finish of the surface to be wiped, the value of component (B) / component (C), which is the ratio of the content of component (B) to the content of component (C), is preferably 1 / 40 or more and 8 / 1 or less, and particularly preferably 1 / 20 or more and 4 / 1 or less, in mass ratio.

[0032] From the viewpoint of ensuring safety, it is preferable that the liquid contains water as a medium. Examples of water include distilled water, purified water, tap water, well water, etc.

[0033] The water content in the liquid is preferably 97% by mass or more, more preferably 98% by mass or more, and particularly preferably 98.5% by mass or more, from the viewpoint of improving the finish of the surface to be wiped. On the other hand, from the viewpoint of ensuring the amount of the germ-killing, antibacterial and antiviral agent, the water content in the liquid is preferably 99.7% by mass or less, and more preferably 99.5% by mass or less. The range of the water content in the liquid is preferably 97% by mass or more and 99.7% by mass or less, more preferably 98% by mass or more and 99.7% by mass or less, and most preferably 98.5% by mass or more and 99.5% by mass or less.

[0034] The liquid may be free of ethanol. If the liquid contains ethanol, the ethanol acts on the cationic surfactant component (B), which may lead to the formation of areas with a large amount of liquid in the thin film formed from the liquid, which may result in a decrease in the finish. Therefore, by making the liquid "free of ethanol", it becomes easier to improve the finish of the surface to be wiped. In this specification, "free of ethanol" includes both the liquid not containing ethanol at all and the liquid inevitably containing a small amount of ethanol. Specifically, this means that the content of ethanol in the liquid is less than 0.005% by mass.

[0035] The liquid preferably does not contain any aqueous solvent other than water. The aqueous solvents referred to here include (1) monohydric alcohols (excluding ethanol), (2) polyhydric alcohols, (3) alkanolamines, and (4) glycol ethers. The present inventors have found that by not containing these aqueous solvents in addition to the above-mentioned ethanol, the deterioration of the finish caused by the reaction with component (B) can be more effectively prevented, and the finish of the surface to be wiped can be further improved.

[0036] Examples of monohydric alcohols include 1-propanol, 2-propanol, and 1-butanol. In this specification, "monohydric alcohol-free" includes both the liquid formulation not containing any monohydric alcohol and the liquid formulation inevitably containing a small amount of monohydric alcohol. Specifically, it means that the content of monohydric alcohol in the liquid formulation is less than 0.005% by mass.

[0037] Examples of polyhydric alcohols include 1,3-butylene glycol, propylene glycol, dipropylene glycol, glycerin, etc. In this specification, "free of polyhydric alcohol" includes both the liquid formulation not containing any polyhydric alcohol and the liquid formulation inevitably containing a small amount of polyhydric alcohol. Specifically, it means that the content of polyhydric alcohol in the liquid formulation is less than 0.005% by mass.

[0038] Examples of alkanolamines include 2-aminoethanol, N-methylethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, diethanolamine, N-methyldiethanolamine, triethanolamine, etc. In this specification, "free of alkanolamine" includes both the liquid formulation not containing alkanolamine at all and the liquid formulation inevitably containing a small amount of alkanolamine. Specifically, it means that the content of alkanolamine in the liquid formulation is less than 0.005% by mass.

[0039] Examples of glycol ethers include diethylene glycol monobutyl ether, ethylene glycol monobenzyl ether, diethylene glycol monohexyl ether, ethylene glycol monophenyl ether, and diethylene glycol diethyl ether. In this specification, "free of glycol ether" includes both the liquid not containing any glycol ether and the liquid inevitably containing a small amount of glycol ether. Specifically, it means that the content of glycol ether in the liquid is less than 0.005% by mass.

[0040] The liquid may be free of silicone. Examples of silicone include dimethyl polysiloxane, dimethyl cyclo polysiloxane, methyl phenyl polysiloxane, methyl hydrogen polysiloxane, higher alcohol modified organo polysiloxane, etc. Silicone may improve the finish of the surface to be wiped due to its lubricity, etc., but the advantage of not containing silicone is that the surface to be wiped is less slippery, and the surface to be wiped, such as a floor, can be expanded because it is not slippery. According to the present invention, even if the liquid does not contain silicone, the finish of the surface to be wiped can be improved. In this specification, "free of silicone" includes both the liquid not containing silicone at all and the liquid inevitably containing a small amount of silicone. Specifically, it means that the content of silicone in the liquid is less than 0.005% by mass.

[0041] In addition to the above-mentioned components, the liquid preparation may further contain components that are commonly used in the art. Examples of such components include pH adjusters, preservatives, fragrances, and colorants. These components can be used alone or in combination of two or more. The content of these components in the liquid preparation is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and is preferably 2.7% by mass or less, more preferably 1.2% by mass or less. Examples of the pH adjuster include inorganic acids such as hydrochloric acid and sulfuric acid, inorganic bases such as sodium hydroxide and potassium hydroxide, and organic bases such as triisopropanolamine. As the pH adjuster, the acid is preferably an inorganic acid such as sulfuric acid, and the base is preferably an inorganic base such as sodium hydroxide and potassium hydroxide. In order not to inhibit the disinfecting property, it is preferable that the liquid does not contain divalent or higher metal ions. In this specification, "does not contain divalent or higher metal ions" includes both that the liquid does not contain any divalent or higher metal ions at all, and that a small amount of divalent or higher metal ions is inevitably mixed into the liquid. Specifically, it means that the amount of divalent or higher metal ions in the liquid is 500 ppm or less by mass.

[0042] The liquid has a pH of 3.0 or more and less than 6.0 at 25° C. from the viewpoints of low skin irritation, antibacterial, germicidal and viral removal. From the same viewpoint, the pH of the liquid at 25° C. is preferably 4.0 or more, more preferably 4.3 or more, and preferably 5.5 or less, more preferably 5.0 or less. For example, LAQUA F-72 manufactured by Horiba Ltd. can be used as a pH measuring device.

[0043] From the viewpoint of achieving the function of removing dirt from the surface to be wiped, the proportion of the liquid agent impregnated into the base sheet is preferably 100% by mass or more, and more preferably 190% by mass or more, relative to the mass of the base sheet, from the viewpoint of antiseptic properties. From the viewpoint of drying property of the wiped surface, the ratio of the liquid agent impregnated in the base sheet is preferably 1000% by mass or less, and more preferably 500% by mass or less. The proportion of the liquid agent impregnated into the base sheet is preferably in the range of 100% by mass to 1000% by mass, more preferably 190% by mass to 500% by mass, based on the mass of the base sheet.

[0044] Next, the base sheet constituting the wet wipes will be described. The base sheet may be a sheet containing a fibrous material, such as a nonwoven fabric, a woven fabric, or a knitted fabric. When a nonwoven fabric is used as the base sheet, a spunlace nonwoven fabric, a meltblown nonwoven fabric, a spunbonded nonwoven fabric, an air-through nonwoven fabric, a resin-bonded nonwoven fabric, a needle-punched nonwoven fabric, etc. may be used. A composite of these nonwoven fabrics may also be used.

[0045] The present inventors have confirmed that in the prior art, the type of nonwoven fabric used as the base sheet affects the finish of the mirror surface to be wiped. Specifically, this is as follows. For example, nonwoven fabric manufacturing methods such as the air-through method, point bond method, air-laid method, and needle punch method have a nonwoven fabric forming step in which relatively short fibers are accumulated using a card, air flow, water flow, calendar roll, or the like. In this step, a textile oil is usually used in the nonwoven fabric forming step for the purpose of preventing static electricity caused by friction with the inside of the device, improving lubricity, and the like. As textile oils, for example, phosphate ester salt-type anionic surfactants, betaine-type amphoteric surfactants, and the like are commonly used. The inventors have confirmed that in conventional wet wipes using a base sheet containing a textile oil, the textile oil is likely to remain as wiping streaks on the surface to be wiped. In addition, in the case of nonwoven fabrics manufactured through a papermaking process in which the raw material comes into contact with metal tools in water, or in the spunlace process which employs hydroentanglement using a water jet from the device, metal ions inevitably present in water tend to remain in the fiber material. The inventor believes that such metal ions, such as calcium ions, are highly likely to be the cause of wiping streaks in conventional wet sheets. In contrast, in the present invention, even when a spunlace nonwoven fabric is used as the base sheet as in Examples 1 to 11 described later, excellent finish is achieved on mirror surfaces and dark-colored surfaces to be wiped.

[0046] From the above viewpoint, in the present invention, it is preferable to use, among the base sheets, nonwoven fabrics produced by a production method in which spun fibers are directly converted into a nonwoven fabric, such as a meltblown nonwoven fabric, a spunbond nonwoven fabric, or a nonwoven fabric in which a meltblown nonwoven fabric and a spunbond nonwoven fabric are laminated, as the base sheet. The reason for this is that the direct nonwoven fabric production methods (sometimes called "direct spinning type") such as the meltblown method and the spunbond method do not include a step of attaching a fiber oil or the like to the fiber surface in the process up to the nonwoven fabric production, and there is no concern about the inclusion of metal ions derived from the water used in the production of the nonwoven fabric. Examples of nonwoven fabrics obtained by laminating a meltblown nonwoven fabric and a spunbond nonwoven fabric include SMS nonwoven fabric and SMMS nonwoven fabric, where M denotes the meltblown nonwoven fabric and S denotes the spunbond nonwoven fabric.

[0047] The basis weight of the base sheet, such as a nonwoven fabric, is preferably 20 g / m 2 More than 300g / m 2 More preferably, it is 40 g / m or less. 2 More than 100g / m 2 The following is the result.

[0048] Examples of the fibers constituting the base sheet include regenerated fibers, natural fibers, synthetic fibers, etc. From the viewpoint of ease of impregnation with and retention of the liquid agent, it is preferable that the base sheet contains regenerated fibers. Examples of regenerated fibers include rayon fibers and acetate fibers, with rayon fibers being preferred from the viewpoint of versatility. Examples of natural fibers include cotton, hemp, collagen fibers, and the like. From the viewpoint of manufacturing efficiency, synthetic fibers are preferably made from fiber-forming resins. 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 may be used alone or in combination of two or more. Among these, it is preferable that the base sheet contains synthetic fibers. Specifically, it is preferable that the base sheet is made of synthetic fibers, or that the synthetic fibers constituting the base sheet are mixed with fibers other than synthetic fibers, such as natural fibers and / or regenerated fibers, from the viewpoint of the finish of the wiping surface.

[0049] When the base sheet contains synthetic fibers, it is preferable that the base sheet mainly contains synthetic fibers or mainly contains a mixture of synthetic fibers and recycled fibers from the viewpoint of the finish of the wiping surface. Here, "mainly contains" means that it occupies 50% by mass or more, preferably 70% by mass or more, and more preferably 90% by mass or more. When other fibers are contained in addition to the mixture of synthetic fibers and recycled fibers, the form of the other fibers is not limited, and includes those in which the other fibers are dispersed in the mixture of synthetic fibers and recycled fibers, and those in which the mixture of synthetic fibers and recycled fibers and a fiber body made of other fibers are laminated, and the mixture and the other fibers are present in a separated state.

[0050] The base sheet may be, for example, a substantially rectangular sheet having a longitudinal direction and a width direction perpendicular to the longitudinal direction. The base sheet may have a macroscopic pattern of projections and recesses having curved portions on at least one surface of the base sheet.

[0051] In order to ensure sufficient strength during use, the base sheet may further include a scrim net for supporting the fiber material. It is also preferable that the scrim net is disposed in the center region in the thickness direction of the base sheet. The scrim net can be integrally intertwined with the fiber material constituting the base sheet, and may be in the form of a net, a lattice, a strand, or the like. Resin can be used as the raw material constituting the scrim net.

[0052] The wet sheet of the present invention can be used alone or attached to a cleaning tool to clean floors, walls and other surfaces of buildings, fittings such as cupboards, window panes, mirrors, doors and doorknobs, rugs, carpets, furniture such as tables and dining tables, kitchens, toilets, and for wiping the body, as sanitary goods, packaging, and the like.

[0053] For example, the wet wipes of the present invention can be formed in a form in which a plurality of sheets are stacked and contained in an enclosed bag made of a soft packaging material, or in a form in which a plurality of sheets are stacked and contained in a container with an openable top, or in a form in which a long sheet is wound in a roll and contained in a container.

[0054] The liquid agent of the present invention is also suitable for use as a wet sheet. For example, the liquid agent of the present invention may be impregnated into an existing sheet each time it is used, and the sheet may be used as a wet sheet for wiping. The configuration of the wet sheet in which the liquid agent of the present invention is used can be the same as that described above for the wet sheet. The liquid agent of the present invention may also be applied to the target surface by, for example, spraying, and then wiped off with an existing sheet, and the above-mentioned effects can also be obtained in this case.

[0055] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. In addition, unless otherwise specified in the table, the content of each component is shown in mass %. The amounts shown in Tables 1 to 3 are the amounts of active ingredients.

[0056] [Examples 1 to 10 and Comparative Examples 1 to 9] A liquid agent containing the components shown in Tables 1 and 2 below was used. A spunlace nonwoven fabric was used as the base sheet. The liquid agent was impregnated at a ratio of 270% by mass relative to the mass of the spunlace nonwoven fabric to produce wet sheets of the Examples and Comparative Examples. The spunlace nonwoven fabric is made of a blend of rayon fiber (fineness 1.7 dtex) and PP / PE fiber (fineness 1.7 dtex), and has a basis weight of 40 g / m2. 2 and had dimensions of 160mm x 140mm.

[0057] Among the components of the liquid preparations shown in Tables 1 and 2, details of component (C) and silicone are as follows. Polyglyceryl-10 laurate: Sunsoft M-12J, manufactured by Taiyo Kagaku Co., Ltd. (number of carbon atoms minus number of double bonds: 12, average degree of polymerization of glycerin: 10, HLB 15.5) Polyglyceryl-10 myristate: Sunsoft Q-14Y-C, manufactured by Taiyo Kagaku Co., Ltd. (number of carbon atoms minus number of double bonds: 14, average degree of polymerization of glycerin: 10, HLB: 16.7) Polyglyceryl-10 oleate: Sunsoft Q-17Y-C, manufactured by Taiyo Kagaku Co., Ltd. (number of carbon atoms minus number of double bonds: 17, average degree of polymerization of glycerin: 10, HLB: 15.9) Silicone: Silicone KM-72, manufactured by Shin-Etsu Chemical Co., Ltd.

[0058] The pH at 25°C of the wet sheets of the Examples and Comparative Examples was measured using the measuring device described above. The finish of the wet sheets to be wiped (black plastic surface and mirror surface) was also evaluated by the method described below. Furthermore, the wet sheets were subjected to a sterilization test, an antibacterial test, and a virus removal test, and were evaluated by the methods described below. These results are shown in Tables 1 and 2.

[0059] <Finishing quality of the surface to be wiped> The wet sheets of the Examples and Comparative Examples were used to wipe the entire surface of a 40 cm x 15 cm black plastic surface and a mirror surface, each wiped back and forth once per second, for a total of two wipes, and the finish of the black plastic surface after drying was evaluated by three expert panelists. The panelists discussed and evaluated according to the following criteria. Evaluation criteria: A: No changes visible to the naked eye. b: Slight wiping streaks (white streaks) are observed from one observation direction. c: Wipe streaks (white streaks) can be seen from several observation directions. d: Bleaching is clearly observed.

[0060] <Bacteria elimination test> The wet sheets of the Examples and Comparative Examples were evaluated in accordance with the "Bacteria Removal Performance Test for Wet Wipes" established by the Japan Clean Paper and Cotton Industry Association. The bacterial species selected were Escherichia coli and Staphylococcus aureus. The viable cell counts of each bacteria were 1.0 to 5.0 × 10 9 The concentration was adjusted to 1 / mL. 0.01 mL of each preparation solution of bacteria was dropped onto a stainless steel plate. The plate was wiped using the wet sheets of the Examples and Comparative Examples. The wiping operation was performed by moving the wet sheet back and forth over the plate 5 times at intervals of about 1 second with a load of 150 g applied to the wet sheet. After the wiping operation, the wet sheet was left for 5 minutes, then transferred to a stomacher bag, and the bacteria were washed out under specified conditions. The mixture was further diluted under specified conditions, inoculated into SCDLP agar medium for general bacteria, and cultured at 35°C for 1 day. After the culture, the viable cell count was measured, and the common logarithm of the number of bacteria was [B]. The same operation was performed using a control sheet, and the common logarithm of the measured number of bacteria was [A]. As the control sheet, a base sheet of the raw material of the wet sheet was used, and purified water was used as the liquid agent. The disinfecting activity value was quantified using the following calculation formula. Sterilization activity value = AB A: The average common logarithm of the viable cell count in three trials using the control sheet. B: The average common logarithm of the viable cell counts obtained by three trials using the wet sheets of the Examples and Comparative Examples. Evaluation criteria: a: The disinfecting activity value is 3.0 or higher. b: The disinfecting activity value is 2.0 or more and less than 3.0. d: The disinfecting activity value is less than 2.0. A disinfecting activity value of 3.0 or more means that the disinfecting ability is particularly high.

[0061] <Antibacterial test> The wet sheets of the Examples and Comparative Examples were evaluated in accordance with JIS Z2801 "Antibacterial processed products - Antibacterial test method, antibacterial effect." Escherichia coli and Staphylococcus aureus were selected as the bacterial species. A sample plate of 5 cm x 5 cm size made of polyethylene resin was wiped back and forth twice with the wet sheet of the Example and Comparative Example, and then dried. Each bacterial liquid was dropped onto the surface of each dried sample plate to inoculate the bacteria. The number of bacteria inoculated was 1.0 to 4.0 x 10 per sample plate. 5 Each sample was prepared. A polyethylene film was placed so that it was in close contact with the bacterial liquid on the sample plate. The size of the film was 4 cm x 4 cm. After that, it was cultured for 24 hours in an environment with a temperature of 35°C and a relative humidity of 90% or more. It was transferred to a stomacher bag, and the bacteria were washed out under specified conditions. Furthermore, it was diluted under specified conditions and inoculated into SCDLP agar medium for general bacteria and cultured at 35°C for one day. After culture, the viable cell count was measured, and the common logarithm of the bacterial cell count was [D]. The same operation was performed using a control sheet, and the common logarithm of the measured bacterial cell count was [C]. The control sheet was a base sheet of the wet sheet material, and purified water was used as the liquid agent. The antibacterial activity value was quantified using the following calculation formula. Antibacterial activity value = CD C: The average common logarithm of the viable cell count in three trials using the control sheet. D: The average common logarithm of the viable cell counts obtained by performing three trials using the wet sheets of the Examples and Comparative Examples. Evaluation criteria: a: Antibacterial activity value is 3.0 or higher. b: Antibacterial activity value is 2.0 or more and less than 3.0. d: Antibacterial activity value is less than 2.0. An antibacterial activity value of 3.0 or higher means that the antibacterial ability is particularly high.

[0062] <Virus removal test> The test was conducted in accordance with the "Test Method for Disinfecting Performance of Wet Wipes" established by the Japan Sanitary Materials Industry Association (hereinafter, this test method is also referred to as the "Association Test Method"). The detailed procedure is as follows. (Virus removal performance evaluation procedure) (1) Influenza A virus (H1N1, A / Puerto Rico / 8 / 1934) was used, and the virus concentration was 1.5×10 in a 0.3% by mass aqueous solution of bovine serum albumin. 9 A virus solution was prepared to give FFU (focus assay) / mL. (2) A coating area of ​​9 cm length x 1.5 cm width was set on a stainless steel plate, 10 μL of the virus solution was placed on the coating area, and the virus solution was spread over the coating area for 30 seconds using a coating stick. (3) The stainless steel plate was dried in a safety cabinet for 5 minutes. (4) The wet sheet to be evaluated was attached to the standard tool described in the Association's test method, and the applied area was wiped. The wiping operation was performed by moving the wet sheet back and forth five times over the plate at intervals of about 1 second with a load of 150 g applied to the wet sheet. (5) The area that had been wiped, including the applied area, was covered with a 10 cm petri dish and left to stand for 5 minutes. (6) The stainless steel plate that had been wiped was transferred to a Stomacher bag, and the remaining viruses were recovered in SCDLP medium (medium containing a disinfectant inactivator) under specified conditions. (7) The SCDLP medium in which the virus was recovered was stirred with a vortex mixer for 3 minutes. (8) The SCDLP medium from (7) above was serially diluted 10-fold using serum-free cell medium. (9) The medium serially diluted in (8) above was added to an MDCK cell culture system for infection, and the cells were allowed to stand at 37°C in a 5% CO2 atmosphere for 20 to 24 hours. After that, the residual infectivity titer (FFU) of the influenza virus was measured by the focus assay method. <Evaluation of virus removal performance> After measuring the residual infectivity by the above-mentioned test method, the common logarithm value of the residual infectivity value in the sheets of the examples and comparative examples was [F], and the common logarithm value of the residual infectivity value in the control sheet was [E], and the virus removal performance was quantified by the following calculation formula. Note that the control sheet was a base sheet of the raw material of the wet wipes, and purified water was used as the liquid agent. The results are shown in Tables 1 and 2. Virus removal = EF Based on the calculated level of virus removal ability, the virus removal performance was scored according to the following evaluation criteria. Evaluation criteria: a: Virus removal rate is 3.0 or higher. b: Virus removal efficiency is 2.0 or more and less than 3.0. d: Virus removal rate is less than 2.0. A virus removal rate of 3.0 or higher means that the virus removal ability is particularly high.

[0063] [Table 1]

[0064] [Table 2]

[0065] As is clear from the results shown in Tables 1 and 2, the wet sheets of Examples 1 to 10, which contain all of the components (A) to (C) in the liquid, showed better finish on the surface to be wiped, such as black plastic or a mirror surface, than the wet sheets of Comparative Examples 1 to 9, which do not contain the polyglycerol fatty acid ester (C). Moreover, the wet sheets of Examples 1 to 10 were all superior in virus removal properties to the wet sheets of Comparative Examples 1 to 9.

[0066] Example 11 A liquid agent containing the components shown in Table 3 below was used. A spunlace nonwoven fabric was used as the base sheet. The liquid agent was impregnated at a ratio of 270% by mass relative to the mass of the spunlace nonwoven fabric to produce a wet sheet. The spunlace nonwoven fabric used was the same as that used in Example 1. Among the components of the liquid preparation shown in Table 3, polyglyceryl-10 laurate had a carbon atom number minus the number of double bonds of 12, an average degree of polymerization of glycerin of about 10, and an HLB of 15.5.

[0067] Example 12 A wet sheet was produced in the same manner as in Example 11, except that a meltblown nonwoven fabric was used as the base sheet instead of the spunlace nonwoven fabric. The meltblown nonwoven fabric is made of PP fibers (fiber diameter approximately 4 μm) and has a basis weight of 25 g / m 2 The sheet was made of two sheets stacked together and had dimensions of 160 mm x 140 mm.

[0068] The pH of the liquid at 25°C for the wet wipes of Examples 11 and 12 was measured using the above-mentioned measuring device. The finish (mirror finish) of the wiped surface was evaluated in the same manner as in Example 1. However, the wiping conditions were changed from two strokes to one stroke, and the evaluation criteria were changed as follows. The results are shown in Table 3. a+: No visible changes to the naked eye and no cloudiness on the mirror surface. A: No visible change, but some cloudiness is observed on the mirror surface.

[0069] [Table 3]

[0070] As shown in Table 3, by changing the fiber material constituting the base sheet from a spunlace nonwoven fabric to a nonwoven fabric manufactured by a direct spinning manufacturing method such as a meltblown nonwoven fabric, the finish quality can be further improved.

Claims

1. A wet wipe having a base sheet containing a fiber material and a liquid agent impregnated in the base sheet, The liquid preparation is (A) Lactic acid, citric acid, malic acid, acetic acid, or salts of these acids, or a combination of two or more selected from these acids and salts (B) a quaternary ammonium salt surfactant, and (C) Polyglycerol fatty acid ester Contains A wet sheet having a pH of 3.0 or more and less than 6.

0.

2. The wet wipe according to claim 1 , wherein the average degree of polymerization of glycerin in the polyglycerin fatty acid ester is 6 or more.

3. 3. The wet wipe according to claim 1, wherein the acyl group in the polyglycerol fatty acid ester has a carbon atom number of 12 or more and 17 or less, the number being calculated by subtracting the number of double bonds from the carbon atom number.

4. 3. The wet wipe according to claim 1, which does not contain any of monohydric alcohols, polyhydric alcohols, alkanolamines, and glycol ethers.

5. The wet sheet according to claim 1 or 2, wherein the liquid agent is impregnated in an amount of 100% by mass or more and 1000% by mass or less relative to the mass of the base sheet.

6. The wet wipe according to claim 1 or 2, wherein the base sheet contains synthetic fibers.

7. The wet sheet according to claim 1 or 2, wherein the base sheet is a meltblown nonwoven fabric, a spunbond nonwoven fabric, or a nonwoven fabric obtained by laminating a meltblown nonwoven fabric and a spunbond nonwoven fabric.

8. (A) Lactic acid, citric acid, malic acid, acetic acid, or salts of these acids, or a combination of two or more selected from these acids and salts (B) a quaternary ammonium salt surfactant, and (C) Polyglycerol fatty acid ester Contains A liquid preparation having a pH of 3.0 or more and less than 6.0.