Detergent composition and wet wipes containing 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 cleaning composition. The present invention also relates to a wet sheet containing the cleaning composition.

Background Art

[0002] When urine splashed on a toilet seat and its surroundings dries, the components in the urine solidify to form strong urine stains. Such urine stains are not easily removed even when wiped with a nearby sheet such as toilet paper. To remove urine stains, it is effective to use a strongly acidic cleaning agent such as citric acid. However, strongly acidic cleaning agents may irritate the skin. To avoid this, it is desirable to use a weakly acidic to neutral cleaning agent, but the urine stain removal performance is not as good as that of strongly acidic cleaning agents.

[0003] As a cleaning composition for toilets having a weakly acidic to neutral pH, Patent Document 1 proposes a cleaning composition containing an amphoteric surfactant, ethanol, and EDTA or its salt, and having a pH of 6.5 to 7.5. Patent Document 2 proposes a cleaning composition for fiber products such as baby clothes and diapers, containing a nonionic surfactant, a potassium salt of a fatty acid or an alkanolamine salt of a fatty acid, a polycarboxylic acid polymer or its salt, and an organic solvent such as ethanol, and having a pH of 8 or more.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] While the detergent compositions described in Patent Documents 1 and 2 can reduce skin irritation, these types of detergent compositions were not sufficiently effective at removing urine stains. Therefore, the object of the present invention is to provide a cleaning agent composition and wet wipes that have excellent cleaning properties against urine stains. [Means for solving the problem]

[0006] The present invention relates to a detergent 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 the polyglycerin fatty acid ester of component (A)).

[0007] The present invention also relates to a wet sheet comprising a base sheet and the aforementioned cleaning agent composition impregnated into the base sheet. In one embodiment, it is preferable that the base sheet is impregnated with the cleaning agent composition in an amount of 100% by mass or more and 500% by mass or less. [Effects of the Invention]

[0008] The present invention provides a cleaning agent composition and a wet sheet that exhibit excellent cleaning properties against stubborn urine stains. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic perspective view of one embodiment of the wet sheet of the present invention. [Modes for carrying out the invention]

[0010] The present invention will be described below based on its preferred embodiments. The present invention relates to a cleaning agent composition (hereinafter also simply referred to as "the composition"). The composition of the present invention can be used as is for cleaning or wiping as a cleaning agent, or the composition can be impregnated into a base sheet and used as a wet sheet for cleaning or wiping.

[0011] The inventors diligently studied the composition of a composition that exhibits excellent cleaning properties against stubborn urine stains, even if it is weakly acidic or neutral. As a result, they discovered that when the composition contains (A) polyglycerin fatty acid ester, (B) amphoteric surfactant, and (C) nonionic surfactant (excluding the polyglycerin fatty acid ester of component (A)), and the total amount of these is contained in a predetermined amount, it is surprisingly possible to significantly and effectively improve the cleaning performance against stubborn urine stains that have solidified and adhered to toilet seats and their surroundings. The composition of the present invention contains all of the above-mentioned components (A) to (C).

[0012] The composition of the present invention contains a polyglycerol fatty acid ester, which is component (A), as one of its constituent components. 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] Polyglycerin fatty acid esters may contain saturated hydrocarbon groups or unsaturated hydrocarbon groups individually as acyl groups, or they may contain a mixture of saturated and unsaturated hydrocarbon groups. From the viewpoint of improving the cleaning ability against stubborn urine stains and enhancing the storage stability of the composition, it is preferable that the polyglycerin fatty acid ester contains at least saturated hydrocarbon groups as acyl groups.

[0014] As the acyl group in the polyglycerol fatty acid ester, a linear acyl group or a branched acyl group may be used. From the viewpoint of enhancing the detergency against strong urine stains and improving the storage stability of the composition, the acyl group in the polyglycerol fatty acid ester is preferably a linear acyl group.

[0015] In the polyglycerol fatty acid ester, the number of carbon atoms of the acyl group is preferably 8 or more, more preferably 10 or more. Also, the number of carbon atoms of the acyl group is preferably 18 or less, more preferably 16 or less. When the number of carbon atoms of 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, as the polyglycerol fatty acid ester, it can contain two or more acyl groups having different numbers of carbon atoms. In that case, from the viewpoint of improving the detergency against urine, particularly dried urine, and the storage stability, it 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 the fragrance 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 by, for example, the following method. <Method for Measuring the Degree of Polymerization of Glycerin> Based on the method described on page 75 of "Polyglycerin Esters" edited by Sakamoto Pharmaceutical Co., Ltd. (1994), the polyglycerol fatty acid ester is saponified and decomposed with KOH-ethanol. After adjusting the pH to 4 with dilute sulfuric acid, the fatty acid part is extracted with hexane. After adjusting the pH of the aqueous layer to 7, desalting treatment is carried out with methanol to obtain the polyglycerol part. The obtained polyglycerol part is subjected to analysis of the average degree of polymerization of glycerin, and the fatty acid part is subjected to analysis of the constituent fatty acids. The column is TSK2500PWXL (manufactured by Tosoh Corporation), the solvent is distilled water (added with 0.1% trifluoroacetic acid), the flow rate is 1 mL / min, the detector is RID, the temperature is 40 °C, and the injection volume is 50 μL. Under these conditions, polyglycerol is analyzed by GPC. A calibration curve is prepared with polyethylene glycol, and the weight-average molecular weight (Mw2) of polyglycerol in terms of polyethylene glycol conversion and the weight-average molecular weight (Mw1) of glycerin are measured. Next, the conversion coefficient (F) of glycerin is calculated by the following formula (1). F = 92 / Mw1 (1) (In the formula, F = conversion coefficient of glycerin, Mw1 = weight-average molecular weight of glycerin) From the weight-average molecular weight (Mw2) of polyglycerol obtained above, the "average degree of polymerization of glycerin" of polyglycerol is determined 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, Mw2 = weight-average molecular weight of polyglycerol)

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

[0020] (A) Commercially available polyglycerin fatty acid esters can also be used. Examples of commercially available products include Sunsoft M-12JW, Sunsoft Q-10D-C, Sunsoft Q-10Y-C, Sunsoft A-14E-C, Sunsoft Q-14Y-C, Sunsoft Q-18Y-C from Taiyo Kagaku Co., Ltd., and NIKKOL Decaglyn 1-PVEX from 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. Furthermore, it is preferable that the composition 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. Having the polyglycerin fatty acid ester content within this range allows for the effective removal of, for example, stubborn urine stains that have solidified and adhered to toilet seats and their surroundings. Moreover, having polyglycerin fatty acid ester within this range makes it less likely for the polyglycerin fatty acid ester to form water-insoluble salts when it combines with heterogeneous ionic surfactants. As a result, even when the composition of the present invention is stored for a long period of time, the formation of water-insoluble salts in the composition can be suppressed, and as a result, the storage stability of the composition can be improved.

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

[0023] The amphoteric surfactant may include, for example, any one of the amphoteric surfactants of the amine oxide type, imidazoline type, carbobetine type, or sulfobetine type, either alone or in mixtures thereof.

[0024] Examples of amine oxide-type amphoteric surfactants include lauryldimethylamine oxide and coconut oil alkyldimethylamine oxide. These can be used individually or in combination of two or more.

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

[0026] Examples of carbobetaine-type amphoteric surfactants include those having an alkyl group, alkenyl group, or acyl group with 10 to 18 carbon atoms. Specifically, examples include lauryldimethylaminoacetic acid betaine, myristyldimethylaminoacetic acid betaine, palmityldimethylaminoacetic acid betaine, and stearyldimethylaminoacetic acid betaine. These can be used individually or in combination of two or more.

[0027] Examples of sulfobetaine-type amphoteric surfactants include N-alkyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, N-alkanoylaminopropyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, N-alkanoylaminopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, lauryl hydroxysulfobetaine, and lauramidopropyl hydroxysultaine. These can be used individually or in combination of two or more.

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

[0029] As amphoteric surfactants, commercially available products such as Anchitol 20HD and Anchitol 20N manufactured by Kao Corporation, Catinal AOC manufactured by Toho Chemical Industries, and Softazolin (registered trademark) LSB manufactured by Kawaken Fine Chemicals Co., Ltd. can also be used.

[0030] The composition of the present invention preferably contains 0.005% by mass or more of an amphoteric surfactant, more preferably 0.01% by mass or more, and even more preferably 0.02% by mass or more. Furthermore, it is preferable that the composition contains 0.3% by mass or less of an amphoteric surfactant, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. Having the amphoteric surfactant content within this range further enhances the cleaning ability against stubborn urine stains and further improves the storage stability of the composition.

[0031] The composition of the present invention contains, as one of its constituent components, a nonionic surfactant (excluding the polyglycerin fatty acid ester of component (A)). The nonionic surfactant is not particularly limited as long as it is a nonionic surfactant other than the polyglycerin fatty acid ester of component (A), and any such surfactant can be used.

[0032] The composition of the present invention, by containing (A) polyglycerin fatty acid ester and (B) amphoteric surfactant, along with (C) a nonionic surfactant, can further enhance its cleaning ability against stubborn urine stains and further improve its storage stability. In particular, even when various components such as fragrances are added to the composition of the present invention, the high cleaning ability of the composition can be ensured while maintaining a good balance between the cleaning ability and storage stability of the composition as a whole.

[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, and the like. These can be used individually or in combination of two or more. From the viewpoint of further enhancing the cleaning power against stubborn urine stains and further improving the storage stability of the composition, it is preferable to include at least a polyoxyethylene alkyl ether or alkyl glucoside as a nonionic surfactant.

[0034] In polyoxyethylene alkyl ethers, 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. Furthermore, 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 ethers, having the number of carbon atoms in the alkyl group within this range makes it possible to achieve both high cleansing properties and low skin irritation.

[0035] Examples of such polyoxyethylene alkyl ethers include polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether. 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 polyoxyethylene lauryl ether as the polyoxyethylene alkyl ether.

[0036] In alkyl glucosides, the number of carbon atoms in the alkyl group is preferably 8 or more, more preferably 9 or more. Furthermore, 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. In alkyl glucosides, having the number of carbon atoms in the alkyl group within this range improves the washability against urine, especially dried urine, and the solubility of the fragrance.

[0037] Examples of such alkyl glucosides include lauryl glucoside, decyl glucoside, and capryl glucoside. From the viewpoint of further improving the cleaning power 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 nonionic surfactants, commercially available products such as Kao Corporation's AG-10LK, AG-124, Emulgen 109P, Emulgen 108, Emulgen 123P, and Emulgen 707 can also be used.

[0039] The composition of the present invention preferably contains a nonionic surfactant in an amount of 0.05% by mass or more, and more preferably 0.1% by mass or more. Furthermore, it is preferable that the nonionic surfactant be contained in an amount of 0.5% by mass or less, and more preferably 0.3% by mass or less. By having the nonionic surfactant content within this range, even when various components such as fragrances are added to the composition of the present invention, for example, it is possible to ensure the high cleaning performance of the composition while maintaining a good balance between the overall cleaning performance and storage stability of the composition.

[0040] One of the features of the composition of the present invention is that it contains components (A) to (C) in such a total amount that it falls within a predetermined range. More specifically, the composition of the present invention preferably contains 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. Furthermore, the composition of the present invention preferably contains 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. By containing components (A) to (C) in a total amount of 0.2% by mass or more, the composition can further enhance its cleaning ability against stubborn urine stains and further enhance its storage stability. Furthermore, by containing components (A) to (C) in a total amount of less than 1% by mass, the composition can maintain high cleaning ability while ensuring the overall stability of the composition.

[0041] In the composition of the present invention, the sum of the content of component (A) and the content of component (C) to the content of component (B) is preferably 2:1 or more, more preferably 3:1 or more, and even more preferably 4:1 or more. Furthermore, the sum of the content of component (A) and the content of component (C) to the content of component (B) is preferably 10:1 or less, more preferably 9:1 or less, and even more preferably 8:1 or less. Having the sum of the content of component (A) and the content of component (C) to the content of component (B) within this range further enhances the cleaning ability against stubborn urine stains and further enhances the storage stability of the composition.

[0042] The composition of the present invention preferably has a pH of 3.5 or higher, more preferably 3.7 or higher, and even more preferably 3.9 or higher at 25°C. Furthermore, the pH at 25°C is preferably 6 or lower, more preferably 5.5 or lower, and even more preferably 5.0 or lower. Having the composition's pH within this range further reduces skin irritation when the composition is used. Moreover, it suppresses the growth of microorganisms, thereby further increasing the storage stability of the composition. In addition, if the composition contains benzoic acids as described later, having the composition's pH within the above range allows the benzoic acids to more effectively inhibit microbial growth. As a result, the bactericidal effect against common bacteria (e.g., Gram-positive bacteria: Staphylococcus aureus, Gram-negative bacteria: Escherichia coli) can be further enhanced. To bring the pH of the composition within this range, it can be adjusted by adding, for example, a pH adjusting agent, a preservative, or a surfactant to the composition, as long as the effects of the present invention are not impaired.

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

[0044] The composition of the present invention preferably has a viscosity at 25°C of 0.1 mPa·s to 50 mPa·s, more preferably 1 mPa·s to 20 mPa·s, and even more preferably 2 mPa·s to 10 mPa·s. Having a viscosity within this range allows the composition to easily spread throughout stubborn urine stains when used for cleaning or wiping, resulting in more effective removal of urine stains than conventional methods. 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 conventional methods without applying excessive force during cleaning or wiping. To bring the viscosity of the composition within this range, it can be adjusted by adding, for example, a viscosity modifier, a solvent, or a surfactant to the composition, as long as the effects of the present invention are not impaired.

[0045] The viscosity of the composition of the present invention can be measured, for example, by the following method. Specifically, 100 mL of the composition at 25°C is placed in a beaker, and the viscosity can be measured 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, at a rate of 60 rpm for 1 minute. If the composition is impregnated into a base sheet and used as a wet sheet, the composition can be extracted by methods such as squeezing or pressing the base sheet by hand, with an extraction device, or with equipment such as a machine, and measured in the same manner.

[0046] The composition of the present invention may contain all of (A) to (C) described above, in addition to various other components, as long as the effects of the present invention are not impaired. Examples of various components include surfactants other than those described above (A) to (C), organic acids, disinfectants, preservatives, fragrances, scents, deodorants, pH adjusters, chelating agents, viscosity modifiers, solvents, etc. These can be used individually or in combination of two or more. These various components can be included as needed based on the properties required of the composition, and if included, the amount of each component in the composition is preferably 0.001% by mass or more and 20% by mass or less.

[0047] Examples of organic acids include unsubstituted benzoic acid (Ph-COOH) or its salts, or combinations thereof. Examples of benzoates in 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. Since benzoic acid compounds can maintain a pH range that can suppress the growth of microorganisms, the storage stability of the composition of the present invention can be further enhanced when it contains benzoic acid compounds. Furthermore, benzoic acid compounds are less susceptible to environmental burdens caused by proteins, metal ions, etc., and can effectively act on bacteria (i.e., Gram-negative or Gram-positive bacteria), thus exhibiting high disinfectant properties. From the viewpoint of further enhancing the storage stability and disinfectant properties of the composition, the composition of the present invention preferably contains benzoic acid compounds in an amount of 0.05% by mass or more and 1.0% by mass or less, and more preferably 0.15% by mass or more and 0.5% by mass or less, relative to the composition.

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

[0049] The composition of the present invention can be used directly as a cleaning agent for cleaning or wiping, or it can be impregnated into a base sheet and used as a wet sheet for cleaning or wiping. Furthermore, because the composition of the present invention has high cleaning power against stubborn urine stains and high storage stability, it 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, a wet sheet containing the composition of the present invention will be described. Figure 1 shows a wet sheet 1, which is one embodiment of the wet sheet of the present invention. The wet sheet 1 comprises a base sheet 2 and the composition of the present invention impregnated into the base sheet 2. Because the composition is impregnated into the base sheet 2, the wet sheet 1 is a wet-type sheet that is in a moist state at room temperature and pressure. Therefore, the wet sheet 1 can be easily used for cleaning or wiping without the need for a separate cleaning agent.

[0051] From the viewpoint of balancing softness and sufficient wet strength, it is preferable that the base sheet is impregnated with the composition of the present invention by 100% by mass or more, more preferably 150% by mass or more, and even more preferably 200% by mass or more. Furthermore, it is preferable that the base sheet is impregnated with the composition of the present invention by 500% by mass or less, 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 two or more. As shown in Figure 1, the wet sheet 1 of this embodiment has a laminated structure 20 in which 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 may be different. The "type" of base sheet 2 referred to here means at least one of the material or physical properties that identify the base sheet 2, such as material type, basis weight, and thickness.

[0053] As shown in Figure 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 the surfaces that come into contact with the object to be cleaned when the wet sheet 1 is used, that is, the surfaces that wipe away dirt and other contaminants attached to the object to be cleaned, and each is made up of one side of the base sheet 2 that constitutes the wet sheet 1. Since the wet sheet 1 of this embodiment has a laminated structure 20 of multiple (2) base sheets 2, the first surface 1a is made up of one side of the base sheet 2 located on one end side in the thickness direction of the laminated structure 20, and the second surface 1b is made up of one side of another base sheet 2 located on the other end side in the thickness direction of the laminated structure 20. Note that the wet sheet of the present invention also includes a form that includes only one base sheet 2, in which case one side of that single base sheet 2 is the first surface 1a and the other side is the second surface 1b.

[0054] As shown in Figure 1, the wet sheet 1 of this embodiment has irregularities formed on the surfaces 1a and 1b that come into contact with the object to be cleaned during use. More specifically, on the first surface 1a of the wet sheet 1, there are multiple convex portions 3 formed by the base sheet 2 (laminated structure 20) protruding from the second surface 1b side to the first surface 1a side, arranged intermittently at regular intervals in rows in both one direction (typically the longitudinal direction of the base sheet 2) and a direction perpendicular to that one direction (typically the width direction of the base sheet 2), and recesses 4 are formed between two adjacent convex portions 3, 3. Furthermore, on the second surface 1b of the wet sheet 1, multiple convex portions 3, formed by the base sheet 2 (laminated structure 20) projecting from the first surface 1a to the second surface 1b, are intermittently arranged at regular intervals in rows in both one direction (typically the longitudinal direction of the base sheet 2) and a direction perpendicular to that direction (typically the width direction of the base sheet 2), and recesses 4 are formed between two adjacent convex portions 3, 3. In other words, in the wet sheet 1 of this embodiment, the convex portions 3 and recesses 4 are arranged alternately in both one direction or perpendicular to that direction on both the first surface 1a and the second surface 1b, forming a staggered pattern overall. Because both surfaces 1a and 1b of the wet sheet 1 of this embodiment have convex and concave surfaces, the entire wet sheet 1 has a bulky three-dimensional shape. The convex portions 3 and recesses 4 are each approximately hemispherical in shape. Details of a base sheet having such a shape are described, for example, in Japanese Patent Application Publication No. 2021-065488.

[0055] The basis weight of the base sheet 2 (basis weight per base sheet) is not particularly limited, but from the standpoint of balancing softness and sufficient wet strength, it is preferably 20 g / m². 2 Above all, a comfortable 40g / m 2 The above applies, and preferably 120 g / m². 2 More preferably 60g / m 2 The following applies:

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

[0057] Examples of base sheets that can be used include paper and nonwoven fabrics. Examples of paper include wet-process paper. Examples of nonwoven fabrics include chemical bonded nonwoven fabrics, thermal bonded nonwoven fabrics, airlaid nonwoven fabrics, spunlace nonwoven fabrics, spunbonded nonwoven fabrics, meltblown nonwoven fabrics, needle-punched nonwoven fabrics, and stitch-bonded nonwoven fabrics.

[0058] The base sheet (for example, base sheet 2 shown in Figure 1) is preferably substantially water-dispersible. Here, "substantially water-dispersible" means that when the fiber sheet is placed in a large amount of water, its shape breaks down and the constituent fibers can disperse in the water, i.e., it has hydrolytic properties. A hydrolytic base sheet, when placed in a large amount of water, such as when flushed down a toilet, quickly breaks down into individual fibers and can be flushed down the toilet without clogging it. However, when wiping away dirt, sufficient wet strength is required for the sheet to withstand the work while impregnated with the composition of the present invention. From this viewpoint, it is preferable that the base sheet contains a water-soluble binder in addition to the fibers. Furthermore, as shown in Figure 1, the wet sheet 1 of this embodiment has irregularities formed on the surfaces 1a and 1b that come into contact with the object to be cleaned during use, and the overall shape is bulky and uneven. The water-soluble binder can also contribute to maintaining this bulky and uneven shape.

[0059] Preferably, the water-soluble binder is one that, when the base sheet is impregnated with the composition of the present invention and is 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 strength when the wet sheet is used. Examples of water-soluble binders having such a function include natural polysaccharides, polysaccharide derivatives, and synthetic polymers. The aforementioned "temporary insolubilization of the water-soluble binder" is typically caused by the action of a binder-insolubilizing component in the composition of the present invention impregnated into the base sheet, and in the present invention, organic solvents and metal ion compounds with a valency of 2 or higher, as described later, can be used as the binder-insolubilizing component.

[0060] Examples of natural polysaccharides include sodium alginate, tranto gum, guar gum, xanthan gum, acacia gum, carrageenan, galactomannan, gelatin, casein, albumin, and purpuran. Examples of polysaccharide derivatives include carboxymethylcellulose, carboxyethylcellulose, carboxymethylated starch or its salts, starch, methylcellulose, and ethylcellulose. Examples of synthetic polymers include polyvinyl alcohol, polyvinyl alcohol derivatives, salts of polymers or copolymers of unsaturated carboxylic acids, and salts of copolymers of unsaturated carboxylic acids and monomers copolymerizable with the unsaturated carboxylic acids. Examples of unsaturated carboxylic acids include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid.

[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 preferably 20% by mass or less, more preferably 10% by mass or less, from the viewpoint of balancing the wet strength and water-soluble properties of the base sheet while keeping the binder content to the minimum necessary. Herein, "content of water-soluble binder in the fiber sheet" refers to the content of water-soluble binder in one base sheet, and in the case where a wet sheet contains multiple base sheets, as in the wet sheet 1 of this embodiment, it is preferable that the content of water-soluble binder in each of the multiple base sheets is within the above range.

[0062] A base sheet can be manufactured by various methods. For example, a papermaking raw material can be obtained by adding a water-soluble binder and, if necessary, a fixing agent for the binder to the pulp fibers to a dispersion containing fibers such as cellulose fibers, and then a base sheet can be manufactured by carrying out a known wet papermaking method using this papermaking raw material. This manufacturing method involves internally adding the water-soluble binder. Alternatively, for example, a wet sheet can be manufactured from a dispersion containing fibers using a known wet papermaking method, the sheet can be dried or semi-dried by pressing and / or heating such as hot air blowing, and then a water-soluble binder can be applied to one side of the sheet by spraying or coating, and then dried further to manufacture a base sheet. This manufacturing method involves externally adding the water-soluble binder.

[0063] Although the present invention has been described above based on its preferred embodiments, the present invention is not limited in any way to the above embodiments and can be modified as appropriate without departing from the spirit of the 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 these examples. Unless otherwise specified, "%" means "mass%".

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

[0066] • (A) Polyglycerin fatty acid ester: Polyglyceryl-10 laurate (manufactured by Taiyo Kagaku Co., Ltd., Sunsoft M-12JW, acyl group has 12 carbon atoms, polyglycerin degree of polymerization is 10)

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

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

[0069] 〔evaluation〕 The pH and viscosity of the compositions obtained in the examples and comparative examples were measured at 25°C according to the method described above. Furthermore, the washability and storage stability of the compositions obtained in the examples and comparative examples were evaluated according to the following method. The results are shown in Table 1.

[0070] [Cleaning properties] The washability of the compositions was evaluated as follows. First, an evaluation sample was prepared by dropping one drop (approximately 0.01 g) of model urine onto a polypropylene substrate (5 cm long x 10 cm wide) using a dropper. Artificial urine containing urea and electrolyte ions was used as the model urine. 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 compositions obtained in the examples and comparative examples was placed in a beaker, and each dried evaluation sample was immersed in the composition one by one and removed after 10 seconds. The same procedure was followed for the remaining two samples. Two expert panelists visually observed how the model urine fell off the polypropylene substrate and evaluated the washability of the compositions according to the following evaluation criteria. The evaluation values ​​were determined after deliberation by the two expert panelists.

[0071] [Evaluation Criteria] 5: Model urine was completely removed from all evaluation samples, or only a small amount remained. 4: In one or more evaluation samples, a portion of the model urine was removed. 3: In one or more evaluation samples, the model urine seeped out and dissolved. 2: In one or more evaluation samples, the model urine leaked. 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 each composition obtained in the examples and comparative examples was placed in a sealed container and left to stand for one month in constant temperature environments of -5°C, 5°C, 20°C, 40°C, and 50°C. Two expert panelists visually observed the presence or absence of precipitate in the compositions at each temperature condition and evaluated the storage stability of the compositions according to the following evaluation criteria. The two expert panelists consulted and determined the evaluation rank.

[0073] [Evaluation Criteria] A: Under all temperature conditions, the composition remained transparent or slightly cloudy. B: The composition became cloudy under one or more temperature conditions. C: Precipitates were observed in the composition under temperature conditions of 1 or higher.

[0074] Next, a sheet piece was obtained by cutting out a rectangular shape (approximately 5.7 g in mass) measuring 245 mm x 300 mm in plan view from the base sheet manufactured according to the following method. After dropping the composition obtained in the examples and comparative examples onto the sheet piece using a dropper so that it was impregnated with 235% by mass, the sheet piece was left to stand at room temperature (ambient temperature 25°C) for 4 hours or more to produce a wet sheet. Furthermore, the disinfecting properties and finishing properties were evaluated according to the following method. The results are shown in Table 1.

[0075] [Method for manufacturing a base sheet] As the constituent fibers of the base sheet, only bleached coniferous kraft pulp (NBKP), which is a cellulose fiber, was used. A water dispersion of NBKP was wet-processed according to conventional methods to obtain wet paper. This wet paper was dried in a through-air dryer until the moisture content was 4% by mass to obtain paper. An aqueous solution of a water-soluble binder containing carboxyl groups (sodium salt of CMC, degree of etherification 0.9, manufactured by Nippon Paper Industries Co., Ltd.) (water-soluble binder concentration 5% by mass, viscosity 1000 mPa·s at a liquid temperature of 60°C) was sprayed onto one side of the paper using a spray nozzle. The amount of this aqueous solution sprayed was adjusted so that the content of sodium salt of CMC in the base sheet was 5% by mass relative to the dry mass of the base sheet. After drying the paper with the water-soluble binder added in this way in a Yankee dryer, the paper was creped using a doctor blade, resulting in a basis weight of 40 g / m². 2 A base sheet was obtained. Two base sheets of the same dimensions thus manufactured were placed on top of each other with the spray surface of the aqueous solution of the water-soluble binder facing inward. In this state, embossing was performed while applying water, and a two-layer base sheet with irregularities on both sides that come into contact with the object to be cleaned during use was obtained, as shown in Figure 1. For the embossing, a pair of heated embossing rolls with interlocking irregularities on their circumferential surfaces were used, and the interlocking depth of the irregularities of the two rolls was about 1 mm.

[0076] [Eliminating properties] The antibacterial properties of the composition were evaluated in accordance with the "Test Method for Antibacterial Activity of Synthetic Laundry Detergents and Soaps (Revised July 31, 2007)" established by the Fair Trade Council for Detergents and Soaps. The evaluation results used the antibacterial activity values ​​of the least effective bacterial species (Staphylococcus aureus and Escherichia coli) used in the test as representative values.

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

[0078] [Finishing properties] When cleaning was performed using the obtained wet sheets, the finish quality of the cleaned object was evaluated according to the following evaluation criteria.

[0079] [Evaluation Criteria] A: The appearance of the object being cleaned is good, and the finish is good. B: Foam remains on the object being cleaned, resulting in a normal finish. C: Streaks remain on the object 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 showed improved cleaning properties, storage stability, and antibacterial properties compared to the compositions obtained in each comparative example. Furthermore, the wet sheets obtained by impregnating a base sheet with the compositions obtained in each example showed improved finishing properties compared to the wet sheets obtained by impregnating a base sheet with the compositions obtained in each comparative example. [Explanation of Symbols]

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

Claims

1. A detergent 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 the polyglycerin fatty acid ester of component (A)).

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

3. The detergent composition according to claim 1 or 2, wherein the acyl group in the polyglycerol fatty acid ester of component (A) has 8 to 18 carbon atoms.

4. The detergent composition according to claim 1 or 2, wherein the degree of polymerization of glycerin in the polyglycerin fatty acid ester of component (A) is 8 or higher.

5. The detergent composition according to claim 1 or 2, wherein the pH at 25°C is 3.5 or higher and 6 or lower.

6. The detergent composition according to claim 1 or 2, wherein the sum of the content of component (A) and the content of component (C) : the content of component (B) = 2:1 to 10:

1.

7. The base sheet comprises a cleaning agent composition according to claim 1 or 2 impregnated into the base sheet, A wet sheet in which the cleaning agent composition is impregnated into the base sheet in an amount of 100% by mass or more and 500% by mass or less.

8. The wet sheet according to claim 7, wherein the base sheet is hydrolyzable.

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