Detergent composition and wet sheet including the same

Abstract

To provide a detergent composition that delivers superior detergency on stubborn urine stains and exhibits high storage stability, and a wet sheet.SOLUTION: A detergent composition contains (A) polyglyceryl fatty acid ester, (B) an ampholytic surfactant and (C) a nonionic surfactant (excluding the (A) polyglyceryl fatty acid ester). In the detergent composition, the total amount of components (A) and (C) is 0.2 mass% or more and less than 1 mass%. The (B) ampholytic surfactant should be a sulfobetaine-based ampholytic surfactant.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a detergent composition. The present invention also relates to a wet sheet containing the detergent composition. [Background technology]

[0002] When urine that has been splashed on the toilet seat and its surroundings dries, the components in the urine solidify, forming strong urine stains. Such urine stains are not easy to remove even by wiping with toilet paper or other readily available sheets. In order to remove urine stains, it is effective to use a strong acid detergent such as citric acid. However, strong acid detergents can irritate the skin. To avoid this, it is desirable to use a weakly acidic or neutral detergent, but the ability to remove urine stains is not as good as that of strong acid detergents.

[0003] As a toilet cleaning composition having a weakly acidic to neutral pH, Patent Document 1 proposes a cleaning composition containing an amphoteric surfactant, ethanol, and EDTA or a salt thereof, and having a pH of 6.5 to 7.5. Patent Document 2 proposes a detergent composition for textile products such as baby clothes and diapers, which contains a nonionic surfactant, a potassium salt of a fatty acid or an alkanolamine salt of a fatty acid, a polycarboxylic acid polymer or a salt thereof, and an organic solvent such as ethanol and has a pH of 8 or higher. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-225762 A [Patent Document 2] JP 2013-36014 A Summary of the Invention [Problem to be solved by the invention]

[0005] It is possible to reduce irritation to the skin using the detergent compositions described in Patent Documents 1 and 2. However, it cannot be said that these types of detergent compositions have sufficient cleaning properties against urine stains. Therefore, an object of the present invention is to provide a detergent composition and a wet sheet having excellent cleaning properties against urine stains. [Means for solving the problem]

[0006] The present invention relates to a cleaning composition containing the following components (A) to (C) in a total amount of 0.2% by mass or more and less than 1% by mass. (A) Polyglycerol fatty acid ester. (B) Amphoteric surfactant. (C) Nonionic surfactants (excluding polyglycerol fatty acid esters, which are component (A)).

[0007] The present invention also relates to a wet sheet comprising a base sheet and the above-mentioned detergent composition impregnated into the base sheet. In one embodiment, the base sheet is preferably impregnated with the detergent composition in an amount of 100% by mass or more and 500% by mass or less. Effect of the Invention

[0008] According to the present invention, there are provided a detergent composition and a wet sheet having excellent cleaning properties against stubborn urine stains. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic perspective view of one embodiment of the wet sheet of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present invention will be described below based on its preferred embodiments. The present invention relates to a detergent composition (hereinafter, also simply referred to as "composition"). The composition of the present invention can be used as a detergent for cleaning or wiping as it is, or can be used for cleaning or wiping by impregnating a substrate sheet with the composition as a wet sheet.

[0011] The present inventors have conducted extensive research into the composition of a composition that has excellent cleaning properties against stubborn urine stains even when the composition is weakly acidic or neutral, and as a result, have surprisingly found that when the composition contains (A) a polyglycerol fatty acid ester, (B) an amphoteric surfactant, and (C) a nonionic surfactant (excluding the polyglycerol fatty acid ester of component (A)), and the total amount of these is contained in the composition in a predetermined amount, it is possible to effectively and excellently enhance the cleaning properties against stubborn urine stains that have solidified and adhered, particularly to toilet seats and the surrounding areas. The composition of the present invention contains all of the above-mentioned components (A) to (C).

[0012] The composition of the present invention contains, as one of its constituents, a polyglycerol fatty acid ester, which is component (A). The polyglycerol fatty acid ester is a polyhydric alcohol-type nonionic surfactant in which the hydrophilic group is polyglycerol and the hydrophobic group is a hydrocarbon group in the acyl group.

[0013] The polyglycerol fatty acid ester may contain, as the acyl group, either a saturated hydrocarbon group or an unsaturated hydrocarbon group, or a mixture of a saturated hydrocarbon group and an unsaturated hydrocarbon group. From the viewpoints of improving the cleaning ability against stubborn urine stains and enhancing the storage stability of the composition, it is preferable that the polyglycerol fatty acid ester contains at least a saturated hydrocarbon group as the acyl group.

[0014] The acyl group in the polyglycerol fatty acid ester may be a straight-chain acyl group or a branched-chain acyl group. From the viewpoints of improving the cleaning ability against stubborn urine stains and improving the storage stability of the composition, the acyl group in the polyglycerol fatty acid ester is preferably a straight-chain acyl group.

[0015] In the polyglycerol fatty acid ester, the number of carbon atoms in the acyl group is preferably 8 or more, more preferably 10 or more. Also, the number of carbon atoms in the acyl group is preferably 18 or less, more preferably 16 or less. When the number of carbon atoms in the acyl group in the polyglycerol fatty acid ester is within this range, the detergency against urine, particularly dried urine, and the storage stability are improved.

[0016] In the composition of the present invention, the polyglycerol fatty acid ester may contain two or more acyl groups having different carbon numbers. In this case, from the viewpoint of improving the cleansing property against urine, particularly dried urine, and the storage stability, the polyglycerol fatty acid ester is preferably a polyglycerol fatty acid ester containing one or more linear acyl groups having 8 to 18 carbon atoms, more preferably a polyglycerol fatty acid ester containing one or more linear acyl groups having 10 to 16 carbon atoms, and even more preferably a polyglycerol fatty acid ester containing one or more linear acyl groups having 12 to 14 carbon atoms.

[0017] In the polyglycerol fatty acid ester, the degree of polymerization of glycerin is preferably 8 or more, more preferably 9 or more. Also, the degree of polymerization of glycerin is preferably 12 or less, more preferably 11 or less. When the degree of polymerization of glycerin in the polyglycerol fatty acid ester is within this range, the detergency against urine, particularly dried urine, and the solubility of fragrances are improved.

[0018] The degree of polymerization of glycerin in the polyglycerol fatty acid ester refers to the average degree of polymerization of glycerin measured, for example, by the following method. <Method for measuring degree of polymerization of glycerin> According to the method described on page 75 of "Polyglycerol Esters" edited by Sakamoto Yakuhin Kogyo Co., Ltd. (1994), 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 pH of the aqueous layer is adjusted to 7, and the mixture is desalted with methanol to obtain the polyglycerol portion. The obtained polyglycerol portion is subjected to analysis of the average degree of polymerization of glycerol, and the fatty acid portion is subjected to analysis of the constituent fatty acids. Polyglycerol is analyzed by GPC under the following conditions: column: TSK2500PWXL (Tosoh Corporation), solvent: distilled water (with 0.1% trifluoroacetic acid added), flow rate: 1mL / min, detector: RID, temperature: 40℃, injection volume: 50μL. A calibration curve is created with polyethylene glycol, and the weight average molecular weight of polyglycerol (Mw2) and the weight average molecular weight of glycerol (Mw1) converted to polyethylene glycol are measured. Next, the conversion factor (F) of glycerol is calculated using the following formula (1). F=92 / Mw1 (1) (In the formula, F=glycerin conversion factor, Mw1=weight average molecular weight of glycerin) From the weight average molecular weight (Mw2) of the polyglycerin obtained above, the "average degree of polymerization of glycerin" of the polyglycerin is calculated by the following formula (2). n = (Mw2 × F-18) / 74 (2) (In the formula, n=average degree of polymerization of glycerin, F=conversion coefficient of glycerin, and Mw2=weight average molecular weight of polyglycerin)

[0019] Examples of such polyglycerol fatty acid esters include polyglyceryl-10 laurate, polyglyceryl-2 caprate, polyglyceryl-10 caprate, polyglyceryl-5 myristate, polyglyceryl-10 myristate, polyglyceryl-10 stearate, polyglyceryl-10 palmitate, etc. These may be used alone or in combination of two or more.

[0020] As the (A) polyglycerol fatty acid ester, commercially available products can be used, such as Sunsoft M-12JW, Sunsoft Q-10D-C, Sunsoft Q-10Y-C, Sunsoft A-14E-C, Sunsoft Q-14Y-C, and Sunsoft Q-18Y-C manufactured by Taiyo Kagaku Co., Ltd., and NIKKOL Decaglyn 1-PVEX manufactured by Nikko Chemicals Co., Ltd.

[0021] The composition of the present invention preferably contains 0.01% by mass or more of polyglycerin fatty acid ester, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, based on the composition. The composition also preferably contains 0.5% by mass or less of polyglycerin fatty acid ester, more preferably 0.4% by mass or less, and even more preferably 0.3% by mass or less, based on the composition. When the content of polyglycerin fatty acid ester is within this range, for example, it is possible to effectively remove strong urine stains that are solidified and attached to a toilet seat and its surroundings. Furthermore, when the polyglycerin fatty acid ester is contained within this range, it is difficult for the polyglycerin fatty acid ester to form a water-insoluble salt when it is combined with a different ionic surfactant. This makes it possible to suppress the formation of a water-insoluble salt in the composition even when the composition of the present invention is stored for a long period of time, and as a result, it is possible to enhance the storage stability of the composition.

[0022] The composition of the present invention contains, as one of its constituent components, an amphoteric surfactant, which is component (B). An amphoteric surfactant is a surfactant that contains surface-active components having both an anionic group and a cationic group.

[0023] The amphoteric surfactant may include, for example, an amine oxide type, an imidazoline type, a carbobetaine type, or a sulfobetaine type amphoteric surfactant alone or in combination.

[0024] Examples of the amine oxide type amphoteric surfactant include lauryl dimethylamine oxide, coconut oil alkyl dimethylamine oxide, etc. These may be used alone or in combination of two or more.

[0025] Examples of the imidazoline type amphoteric surfactant include 2-alkyl-N-carboxymethylimidazolinium betaine, 2-alkyl-N-carboxyethylimidazolinium betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, etc. These can be used alone or in combination of two or more.

[0026] Examples of carbobetaine-type amphoteric surfactants include those having an alkyl group, an alkenyl group, or an acyl group having 10 to 18 carbon atoms. Specific examples include lauryl dimethylamino acetate betaine, myristyl dimethylamino acetate betaine, palmityl dimethylamino acetate betaine, stearyl dimethylamino acetate betaine, etc. These may be used alone or in combination of two or more.

[0027] Examples of sulfobetaine-type amphoteric surfactants include N-alkyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine having an alkyl group with 10 to 18 carbon atoms, N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, N-alkanoylaminopropyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine having an alkanoyl group with 10 to 18 carbon atoms, N-alkanoylaminopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, etc. These can be used alone or in combination of two or more.

[0028] The composition of the present invention preferably contains at least an amine oxide or sulfobetaine amphoteric surfactant as an amphoteric surfactant. Since amine oxide and sulfobetaine amphoteric surfactants have relatively high cleaning properties among amphoteric surfactants, the composition of the present invention contains an amine oxide or sulfobetaine amphoteric surfactant, which can further improve the cleaning properties against strong urine stains. In particular, by using an amphoteric surfactant in combination with a polyglycerol fatty acid ester, the amphoteric surfactant functions as an auxiliary agent that improves the high cleaning properties and excellent storage stability of the polyglycerol fatty acid ester. As a result, the composition of the present invention has further improved cleaning properties against strong urine stains and further improved storage stability. From the viewpoint of further improving the cleaning ability against stubborn urine stains and further improving the storage stability of the composition, it is preferable to use lauryl dimethylamine oxide, coconut oil alkyl dimethylamine oxide, etc. as the amine oxide type amphoteric surfactant. From the same viewpoint, it is preferable to use lauryl hydroxysulfobetaine, lauramidopropyl hydroxysultaine, etc. as the sulfobetaine type amphoteric surfactant.

[0029] As the amphoteric surfactant, for example, commercially available products such as Amphitol 20HD and Amphitol 20N manufactured by Kao Corporation, Catinal AOC manufactured by Toho Chemical Industry Co., Ltd., and Softazoline (registered trademark) LSB manufactured by Kawaken Fine Chemical Co., Ltd. can be used.

[0030] The composition of the present invention preferably contains 0.005% by mass or more of the amphoteric surfactant, more preferably 0.01% by mass or more, and even more preferably 0.02% by mass or more, based on the composition. Also, the composition preferably contains 0.3% by mass or less of the amphoteric surfactant, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less, based on the composition. By containing the amphoteric surfactant in this range, the cleaning ability against stubborn urine stains can be further improved, and the storage stability of the composition can be further improved.

[0031] The composition of the present invention contains, as one of its constituents, a nonionic surfactant (C) (excluding the polyglycerol fatty acid ester of the component (A)). There are no particular limitations on the nonionic surfactant, and any nonionic surfactant other than the polyglycerol fatty acid ester of the component (A) can be used.

[0032] The composition of the present invention contains (A) a polyglycerol fatty acid ester, (B) an amphoteric surfactant, and (C) a nonionic surfactant, thereby further improving the cleaning ability against stubborn urine stains and further improving the storage stability of the composition. In particular, even when various ingredients such as fragrances are added to the composition of the present invention, the cleaning ability and storage stability of the entire composition can be well balanced and excellent while ensuring high cleaning ability of the composition.

[0033] Examples of nonionic surfactants include glycerin fatty acid esters, propylene glycol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitan tetraoleate, high-quality sorbitan fatty acid esters, high-quality polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene glycol, polyethylene glycol fatty acid esters, polyoxyethylene hydrogenated castor oil, alkyl alkanolamides, alkyl glucosides, etc. These may be used alone or in combination of two or more. From the viewpoint of further improving the cleaning ability against stubborn urine stains and further improving the storage stability of the composition, it is preferable that the composition contains at least a polyoxyethylene alkyl ether or an alkyl glucoside as a nonionic surfactant.

[0034] In polyoxyethylene alkyl ether, the number of carbon atoms in the alkyl group is preferably 5 or more, more preferably 7 or more, and even more preferably 9 or more. In addition, the number of carbon atoms in the alkyl group is preferably 18 or less, more preferably 15 or less, and even more preferably 13 or less. In polyoxyethylene alkyl ether, when the number of carbon atoms in the alkyl group is within this range, it is possible to achieve both high cleansing properties and low irritation to the skin.

[0035] Examples of such polyoxyethylene alkyl ethers include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, etc. From the viewpoints of further improving the cleaning ability against stubborn urine stains and further improving the storage stability of the composition, it is preferable to use polyoxyethylene lauryl ether as the polyoxyethylene alkyl ether.

[0036] In the alkyl glucoside, the number of carbon atoms in the alkyl group is preferably 8 or more, more preferably 9 or more. Moreover, the number of carbon atoms in the alkyl group is preferably 16 or less, more preferably 14 or less, and even more preferably 12 or less. When the number of carbon atoms in the alkyl group in the alkyl glucoside is within this range, the cleansing properties for urine, particularly dried urine, and the solubility of fragrances are improved.

[0037] Examples of such alkyl glucosides include lauryl glucoside, decyl glucoside, capryl glucoside, etc. From the viewpoint of further improving the cleaning ability against stubborn urine stains and further improving the storage stability of the composition, it is preferable to use lauryl glucoside or decyl glucoside as the alkyl glucoside.

[0038] As the nonionic surfactant, for example, commercially available products such as AG-10LK, AG-124, Emulgen 109P, Emulgen 108, Emulgen 123P, and Emulgen 707 manufactured by Kao Corporation can be used.

[0039] The composition of the present invention preferably contains 0.05% by mass or more, more preferably 0.1% by mass or more, of the nonionic surfactant relative to the composition. The composition preferably contains 0.5% by mass or less, more preferably 0.3% by mass or less, of the nonionic surfactant relative to the composition. By containing the nonionic surfactant within this range, for example, even when various ingredients such as fragrances are added to the composition of the present invention, the composition can have a good balance of cleaning properties and storage stability while ensuring high cleaning properties of the composition as a whole.

[0040] One of the features of the composition of the present invention is that it contains the components (A) to (C) in a total amount within a predetermined range. In detail, the composition of the present invention preferably contains the components (A) to (C) in a total amount of 0.2% by mass or more, more preferably 0.25% by mass or more, and even more preferably 0.3% by mass or more. The composition of the present invention preferably contains the components (A) to (C) in a total amount of less than 1% by mass, more preferably 0.7% by mass or less, and even more preferably 0.5% by mass or less. When the composition contains the components (A) to (C) in a total amount of 0.2% by mass or more, the cleaning ability against stubborn urine stains can be further improved and the storage stability of the composition can be further improved. When the composition contains the components (A) to (C) in a total amount of less than 1% by mass, the stability of the entire composition can be ensured while maintaining high cleaning ability.

[0041] In the composition of the present invention, the ratio of the sum of the contents of the components (A) and (C): the content of the component (B) is preferably 2:1 or more, more preferably 3:1 or more, and even more preferably 4:1 or more. In addition, the ratio of the sum of the contents of the components (A) and (C): the content of the component (B) is preferably 10:1 or less, more preferably 9:1 or less, and even more preferably 8:1 or less. When the ratio of the sum of the contents of the components (A) and (C): the content of the component (B) is within this range, the cleaning ability against stubborn urine stains can be further improved, and the storage stability of the composition can be further improved.

[0042] The composition of the present invention has a pH at 25°C of preferably 3.5 or more, more preferably 3.7 or more, and even more preferably 3.9 or more. The pH at 25°C is preferably 6 or less, more preferably 5.5 or less, and even more preferably 5.0 or less. When the pH of the composition is in this range, the irritation to the skin when the composition is used can be further reduced. Furthermore, the growth of microorganisms can be inhibited, so the storage stability of the composition can be further increased. In addition, when the composition contains benzoic acids described later, the pH of the composition in the above range allows the benzoic acids to more effectively inhibit the growth of microorganisms. As a result, the sterilization effect against general bacteria (e.g., gram-positive bacteria: Staphylococcus aureus, gram-negative bacteria: Escherichia coli) can be further improved. In order to bring the pH of the composition into this range, it can be adjusted by adding, for example, a pH adjuster, a preservative, or a surfactant to the composition, within a range that does not impair the effects of the present invention.

[0043] The pH of the composition of the present invention is measured, for example, using a SevenCompact S220 manufactured by METTLER TOLEDO Co., Ltd. When the composition is impregnated into a base sheet and used as a wet sheet, the composition is extracted, for example, by squeezing or pressing the base sheet by hand, with an extraction member, or with equipment such as a machine, and the pH is measured in the same manner.

[0044] The composition of the present invention has a viscosity at 25°C of preferably 0.1 mPa·s or more and 50 mPa·s or less, more preferably 1 mPa·s or more and 20 mPa·s or less, and even more preferably 2 mPa·s or more and 10 mPa·s or less. When the viscosity of the composition is in this range, when the composition is used for cleaning or wiping, the composition is more likely to spread over the entire surface of stubborn urine stains, and as a result, urine stains can be removed more effectively than before. In particular, when the composition is impregnated into a base sheet and used as a wet sheet, urine stains can be removed more effectively than before without applying excessively strong force during cleaning or wiping. In order to bring the viscosity of the composition into this range, it can be adjusted by adding, for example, a viscosity modifier, a solvent or a surfactant to the composition, within a range that does not impair the effects of the present invention.

[0045] The viscosity of the composition of the present invention is measured, for example, by the following method. In detail, 100 mL of the composition at 25° C. is placed in a beaker, and the viscosity can be measured at 60 rpm for 1 minute using a VISCOMETER TVB-10 manufactured by Toki Sangyo Co., Ltd., equipped with a low-viscosity spindle (spindle No. M1), with the spindle immersed in the composition. When the composition is impregnated into a substrate sheet and used as a wet sheet, the composition is extracted, for example, by squeezing or pressing the substrate sheet by hand, with an extracting member or with equipment such as a machine, and the composition is similarly measured.

[0046] The composition of the present invention may contain various components in addition to all of the above-mentioned (A) to (C) within the scope of not impairing the effects of the present invention. Examples of the various components include surfactants other than the above-mentioned components (A) to (C), organic acids, bactericides, preservatives, fragrances, flavorings, deodorants, pH adjusters, sequestering agents, viscosity adjusters, solvents, etc. These can be used alone or in combination of two or more. These various components can be contained as necessary based on the properties required for the composition, and the amount of each of them when contained in the composition can be preferably 0.001% by mass or more and 20% by mass or less.

[0047] Examples of organic acids include benzoic acids such as unsubstituted benzoic acid (Ph-COOH) or a salt thereof, or a combination thereof. Examples of benzoic acid salts of benzoic acids include water-soluble salts, specifically, one or more metal salts selected from alkali metal salts such as sodium salts and potassium salts, and alkaline earth metal salts such as calcium salts and magnesium salts. Benzoic acids can maintain a pH range that can inhibit the proliferation of microorganisms, so when the composition of the present invention contains benzoic acids, the storage stability of the composition can be further improved. Furthermore, benzoic acids are not easily affected by environmental loads caused by proteins, metal ions, etc., and can effectively act on bacteria (i.e., gram-negative bacteria or gram-positive bacteria), so they can exhibit high disinfecting properties. From the viewpoint of further improving the storage stability and disinfecting properties of the composition, the composition of the present invention preferably contains benzoic acids in an amount of 0.05% by mass or more and 1.0% by mass or less, more preferably 0.15% by mass or more and 0.5% by mass or less, based on the composition.

[0048] The composition of the present invention is obtained by dissolving the above-mentioned components (A) to (C) in water. The content of water in the composition is preferably 50% by mass to 90% by mass, more preferably 60% by mass to 85% by mass, and even more preferably 70% by mass to 80% by mass.

[0049] The composition of the present invention can be used as a cleaning agent for cleaning or wiping as it is, or can be used as a wet sheet for cleaning or wiping by impregnating a substrate sheet with the composition. In addition, the composition of the present invention has high cleaning ability and storage stability against stubborn urine stains, and can be used as a cleaning agent for various applications by utilizing these properties. In particular, the composition of the present invention can be suitably used as a toilet cleaning agent.

[0050] Next, the wet sheet containing the composition of the present invention will be described. FIG. 1 shows a wet sheet 1 which is one embodiment of the wet sheet of the present invention. The wet sheet 1 includes a base sheet 2 and the composition of the present invention impregnated into the base sheet 2. The wet sheet 1 is a wet-type sheet that is in a wet state at normal temperature and pressure because the base sheet 2 is impregnated with the composition. Therefore, the wet sheet 1 can be easily used for cleaning or wiping as it is, without the need for a separate detergent.

[0051] From the viewpoint of a balance between softness and sufficient wet strength, the base sheet is preferably impregnated with 100% by mass or more of the composition of the present invention, more preferably 150% by mass or more, and even more preferably 200% by mass or more, and preferably 500% by mass or less of the composition of the present invention, more preferably 400% by mass or less, and even more preferably 300% by mass or less.

[0052] In the wet sheet of the present invention, the number of base sheets is not particularly limited and may be one or more than two. As shown in FIG. 1, the wet sheet 1 of this embodiment has two base sheets 2, and has a laminated structure 20 in which the multiple (two) base sheets 2 are laminated in the thickness direction. The multiple base sheets 2 constituting the laminated structure 20 may be of the same type or different types. The "type" of the base sheet 2 here means at least one of the materials and physical properties for specifying the base sheet 2, such as material, basis weight, and thickness.

[0053] As shown in FIG. 1, the wet sheet 1 has a sheet-like shape and has a first surface 1a and a second surface 1b located on the opposite side. Both surfaces 1a and 1b are surfaces that come into contact with the object to be cleaned when the wet sheet 1 is used, that is, surfaces that wipe off dirt and the like attached to the object to be cleaned, and each of them is one side of a base sheet 2 constituting the wet sheet 1. The wet sheet 1 of this embodiment has a laminated structure 20 of multiple (two) base sheets 2, so that the first surface 1a is one side of a base sheet 2 located at one end side in the thickness direction of the laminated structure 20, and the second surface 1b is one side of another base sheet 2 located at the other end side in the thickness direction of the laminated structure 20. The wet sheet of the present invention includes a form including only one base sheet 2, and in such a form, one surface of the one base sheet 2 is the first surface 1a, and the other surface is the second surface 1b.

[0054] The wet sheet 1 of this embodiment has projections and recesses formed on its surfaces 1a and 1b, which come into contact with an object to be cleaned during use, as shown in Fig. 1. More specifically, on the first surface 1a of the wet sheet 1, a base sheet 2 (laminate structure 20) has a base sheet 2 protruding from the second surface 1b side to the first surface 1a side, and the projections 3 are arranged at regular intervals so as to form a row in both one direction (typically the longitudinal direction of the base sheet 2) and a direction perpendicular to the one direction (typically the width direction of the base sheet 2), and a recess 4 is formed between two adjacent projections 3, 3. In addition, on the second surface 1b of the wet sheet 1, a plurality of convex portions 3 formed by the base sheet 2 (laminate structure 20) protruding from the first surface 1a side to the second surface 1b side are arranged at regular intervals so as to form a row in both directions, that is, in one direction (typically the longitudinal direction of the base sheet 2) and in a direction perpendicular to the one direction (typically the width direction of the base sheet 2), and a concave portion 4 is formed between two adjacent convex portions 3, 3. That is, in the wet sheet 1 of this embodiment, on both the first surface 1a and the second surface 1b, the convex portions 3 and the concave portions 4 are alternately arranged in both one direction and a direction perpendicular thereto, forming a houndstooth pattern as a whole. In the wet sheet 1 of this embodiment, both surfaces 1a and 1b have concaves and convexes in this way, so that the entire wet sheet 1 has a bulky three-dimensional shape. The convex portions 3 and the concave portions 4 each have an approximately hemispherical shape. Details of a base sheet having such a shape are described, for example, in JP 2021-065488 A.

[0055] The basis weight of the base sheet 2 (basis weight per sheet) is not particularly limited, but from the viewpoint of the balance between softness and sufficient wet strength, it is preferably 20 g / m 2 More preferably, 40 g / m 2 More preferably, it is 120 g / m 2 Less than 60 g / m 2 The following is the result.

[0056] The fibers contained in the base sheet are preferably hydrophilic, and a typical example is cellulose fiber. Examples of cellulose fibers include bleached wood pulp such as softwood bleached kraft pulp (NBKP), softwood bleached sulfite pulp (NBSP), and hardwood bleached kraft pulp (LBKP), natural cellulose fibers such as cotton and hemp, and regenerated cellulose fibers such as rayon, lyocell, and cupra, and these can be used alone or in combination of two or more.

[0057] Examples of the base sheet include paper and nonwoven fabric. Examples of the paper include wet-laid paper. Examples of the nonwoven fabric include chemical bond nonwoven fabric, thermal bond nonwoven fabric, airlaid nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, needle punch nonwoven fabric, and stitch bond nonwoven fabric.

[0058] It is preferable that the base sheet (for example, the base sheet 2 shown in FIG. 1) is substantially water-dispersible. Here, "substantially water-dispersible" refers to the fact that when the fiber sheet is put into a large amount of water, the shape is broken and the constituent fibers can be dispersed in water, that is, the base sheet has water-disintegrating properties. When the base sheet has water-disintegrating properties, for example, when it is put into a large amount of water, such as when it is flushed down a flush toilet, it quickly disintegrates at the fiber level and can be flushed down the flush toilet without clogging it. However, when wiping off dirt, the base sheet needs to have sufficient wet strength to withstand the work while impregnated with the composition of the present invention. From this viewpoint, it is preferable that the base sheet further contains a water-soluble binder in addition to the fibers. In addition, as shown in FIG. 1, the wet sheet 1 of this embodiment has unevenness formed on the surfaces 1a and 1b that come into contact with the object to be cleaned during use, and has a bulky uneven shape as a whole, and the water-soluble binder can also contribute to maintaining such a bulky uneven shape.

[0059] The water-soluble binder is preferably one that, when the base sheet is impregnated with the composition of the present invention and in a wet state, temporarily becomes insoluble, thereby functioning as a binder that maintains the bonds between the constituent fibers of the base sheet and plays a role in maintaining the strength of the wet sheet when it is in use, and examples of water-soluble binders having such functions include natural polysaccharides, polysaccharide derivatives, and synthetic polymers. Note that the above-mentioned "temporary insolubilization of the water-soluble binder" typically occurs due to the action of a binder insolubilizing component in the composition of the present invention impregnated into the base sheet, and in the present invention, the binder insolubilizing component can be an organic solvent and a divalent or higher metal ion compound, which will be described later.

[0060] Examples of natural polysaccharides include sodium alginate, trant gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, and purpuran. Examples of the polysaccharide derivatives include carboxymethyl cellulose, carboxyethyl cellulose, carboxymethylated starch or a salt thereof, starch, methyl cellulose, ethyl cellulose, and the like. Examples of synthetic polymers include polyvinyl alcohol, polyvinyl alcohol derivatives, salts of polymers or copolymers of unsaturated carboxylic acids, salts of copolymers of unsaturated carboxylic acids and monomers copolymerizable with the unsaturated carboxylic acids, etc. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, fumaric acid, etc.

[0061] The content of the water-soluble binder in the base sheet is preferably 2% by mass or more, more preferably 5% by mass or more, and is preferably 20% by mass or less, more preferably 10% by mass or less, from the viewpoint of balancing the wet strength and water disintegrability of the base sheet while keeping the binder content to a necessary minimum. Note that the "content of the water-soluble binder in the fiber sheet" here means the content of the water-soluble binder in one base sheet, and when a wet sheet contains multiple base sheets, as in the wet sheet 1 of this embodiment, it is preferable that the content of the water-soluble binder in each of the multiple base sheets is within the above range.

[0062] The base sheet can be manufactured by various methods. For example, a water-soluble binder and, if necessary, a fixing agent for the binder to pulp fibers are added to a dispersion containing fibers such as cellulose fibers to obtain a papermaking raw material, and a known wet papermaking method is carried out using the papermaking raw material to manufacture the base sheet. This manufacturing method is a method of internally adding a water-soluble binder. Also, for example, a wet sheet is manufactured from a dispersion containing fibers by a known wet papermaking method, and the sheet is subjected to a press dehydration treatment and / or a heat treatment such as hot air blowing to make it dry or semi-dried, and then a water-soluble binder is applied to one side of the sheet by spraying or coating, and further dried to manufacture the base sheet. This manufacturing method is a method of externally adding a water-soluble binder.

[0063] While the present invention has been described above based on its preferred embodiments, the present invention is not limited to the above-described embodiments and can be modified as appropriate without departing from the spirit of the present invention. EXAMPLES

[0064] The present invention will be described in more detail below with reference to examples. However, the scope of the present invention is not limited to such examples. Unless otherwise specified, "%" means "% by mass".

[0065] [Examples 1 to 8 and Comparative Examples 1 to 7] A composition was prepared by mixing (A) polyglycerol fatty acid ester, (B) amphoteric surfactant, (C) nonionic surfactant and various other components in the mixing ratios shown in Table 1. Details of each component shown in Table 1 are as follows.

[0066] (A) Polyglycerol fatty acid ester: Polyglyceryl-10 laurate (manufactured by Taiyo Kagaku Co., Ltd., Sunsoft M-12JW, number of carbon atoms in the acyl group is 12, degree of polymerization of polyglycerol is 10)

[0067] (B) Amphoteric surfactant: Lauryl hydroxysulfobetaine (Kao Corporation, Amphitol 20HD) (B) Amphoteric surfactant: Lauryl dimethylamine oxide (Kao Corporation, Amphitol 20N)

[0068] (C) Nonionic surfactant: Decyl glucoside (Kao Corporation, AG-10LK, alkyl group carbon number 9-11) (C) Nonionic surfactant: Polyoxyethylene lauryl ether (Kao Corporation, Emulgen 109P, alkyl group carbon number 12)

[0069] 〔evaluation〕 According to the above-mentioned methods, the pH and viscosity at 25° C. of the compositions obtained in the Examples and Comparative Examples were measured. The cleaning properties and storage stability of the compositions obtained in the Examples and Comparative Examples were evaluated according to the following methods. The results are shown in Table 1.

[0070] [Cleaning ability] The cleaning properties of the composition were evaluated as follows. First, a drop of model urine (about 0.01 g) was dropped onto one location on a polypropylene substrate (5 cm long x 10 cm wide) using a dropper to prepare an evaluation sample. As the model urine, artificial urine containing urea and electrolyte ions was used. Three evaluation samples were prepared in the same manner, and these evaluation samples were heated and dried at 100°C for 60 minutes. Next, 100 mL of the composition obtained in the examples and comparative examples was placed in a beaker, and the dried evaluation samples were immersed in the composition one by one, and then pulled out after 10 seconds. The remaining two samples were similarly evaluated. The way the model urine fell off the polypropylene substrate was visually observed by two expert panelists, and the cleaning properties of the composition were evaluated according to the following evaluation criteria. The two expert panelists discussed and determined the evaluation value.

[0071] [Evaluation Criteria] 5: The model urine was completely removed or only a small amount remained from each evaluation sample. 4: A portion of the model urine was removed in one or more evaluation samples. 3: The model urine bled and dissolved in one or more evaluation samples. 2: The model urine bled in one or more evaluation samples. 1: No changes were observed in the model urine in any of the evaluation samples.

[0072] [Storage stability] The storage stability of the compositions was evaluated as follows. First, 50 mL of the compositions obtained in the Examples and Comparative Examples were placed in airtight containers, sealed, and left to stand for one month in constant temperature environments of -5°C, 5°C, 20°C, 40°C, and 50°C. The presence or absence of precipitate in the compositions under each temperature condition was visually observed by two expert panelists, and the storage stability of the compositions was evaluated according to the following evaluation criteria. The two expert panelists discussed and determined the evaluation rank.

[0073] [Evaluation Criteria] A: Under all temperature conditions, the composition remained transparent or was slightly cloudy. B: The composition became cloudy under one or more temperature conditions. C: Precipitates were observed in the composition under one or more temperature conditions.

[0074] Next, a sheet piece having a rectangular shape in plan view of 245 mm × 300 mm (mass: about 5.7 g) was cut out from the base sheet produced according to the following method. The composition obtained in the Examples and Comparative Examples was dripped onto the sheet piece with a dropper so that the sheet piece was impregnated with 235 mass % of the composition, and the sheet piece was left to stand at room temperature (ambient temperature 25°C) for 4 hours or more to produce a wet sheet. The disinfecting properties and finish were evaluated according to the following methods. The results are shown in Table 1.

[0075] [Method of manufacturing base sheet] Only softwood bleached kraft pulp (NBKP), which is a cellulose fiber, was used as the constituent fiber of the base sheet. A wet paper was obtained by wet-pressing an aqueous dispersion of NBKP according to a conventional method. The wet paper was dried in a through-air dryer until the moisture content reached 4% by mass to obtain paper, and an aqueous solution (concentration of water-soluble binder of 5% by mass, viscosity of 1000 mPa·s at a liquid temperature of 60°C) of a water-soluble binder having a carboxyl group (sodium salt of CMC, degree of etherification of 0.9, manufactured by Nippon Paper Industries Co., Ltd.) was sprayed on one side of the paper using a spray nozzle. The amount of the aqueous solution sprayed was adjusted so that the content of the sodium salt of CMC in the base sheet was 5% by mass relative to the dry mass of the base sheet. The paper to which the water-soluble binder had been added was dried in a Yankee dryer, and then the paper was creped using a doctor blade to obtain a paper with a basis weight of 40 g / m. 2 Two substrate sheets of the same size thus produced were stacked with the sprayed surface of the aqueous solution of the water-soluble binder facing inward, and in this state, embossing was performed while applying water to the substrate, to obtain a substrate sheet with a two-layer structure having irregularities on both sides that come into contact with the object to be cleaned during use, as shown in Figure 1. Note that the embossing was performed using a pair of heated embossing rolls having interlocking irregularities on their peripheral surfaces, and the interlocking depth of the irregularities of the two rolls was about 1 mm.

[0076] [Eliminating properties] The disinfecting properties of the composition were evaluated in accordance with the "Testing Method for Disinfecting Activity of Synthetic Laundry Detergents and Soaps (revised July 31, 2007)" established by the Detergent and Soap Fair Trade Council. The disinfecting activity values ​​of the strains of bacteria (Staphylococcus aureus and Escherichia coli) that had low disinfecting properties were used as representative results.

[0077] [Evaluation Criteria] A: 3 or more. B: 2 or more but less than 3. C: Less than 2.

[0078] [Finishing properties] When the obtained wet sheet was used to clean an object, the finish of the object was evaluated according to the following evaluation criteria.

[0079] [Evaluation Criteria] A: The appearance of the item being cleaned is good, and the finish is good. B: Foam remains on the item being cleaned, and the finish is normal. C: Streaks remain on the item being cleaned, resulting in a poor finish.

[0080] [Table 1]

[0081] As is clear from the results shown in Table 1, the compositions obtained in each Example had improved cleaning properties, storage stability, and disinfecting properties compared to the compositions obtained in each Comparative Example. In addition, the wet sheets obtained by impregnating a base sheet with the composition obtained in each Example had improved finish compared to the wet sheets obtained by impregnating a base sheet with the composition obtained in each Comparative Example. [Explanation of symbols]

[0082] 1 Wet wipes 1a First Side 1b Second Side 2. Base sheet 20 Laminated structure 3 Convex 4 Recess

Claims

1. A cleaning composition comprising the following components (A) to (C) in a total amount of 0.2% by mass or more and less than 1% by mass: (A) Polyglycerol fatty acid ester. (B) an amphoteric surfactant. (C) Nonionic surfactants (excluding the polyglycerol fatty acid ester of component (A)).

2. 2. The cleaning composition according to claim 1, wherein the amphoteric surfactant of component (B) is a sulfobetaine-type amphoteric surfactant.

3. 3. The cleansing composition according to claim 1, wherein the number of carbon atoms in the acyl group in the polyglycerol fatty acid ester of component (A) is 8 or more and 18 or less.

4. 3. The cleansing composition according to claim 1, wherein the degree of polymerization of glycerin in the polyglycerin fatty acid ester of component (A) is 8 or more.

5. 3. The cleaning composition according to claim 1, which has a pH at 25°C of 3.5 or more and 6 or less.

6. 3. The cleaning composition according to claim 1, wherein the total content of the component (A) and the content of the component (C):the content of the component (B) is 2:1 to 10:

1.

7. A cleaning agent composition according to claim 1 or 2, comprising: a base sheet; and the cleaning agent composition according to claim 1 or 2 impregnated into the base sheet, The wet wipes have the substrate sheet impregnated with the detergent composition in an amount of 100% by mass or more and 500% by mass or less.

8. The wet wipe according to claim 7, wherein the base sheet is water-decomposable.

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