Liquid detergent composition

Abstract

To provide a liquid detergent composition in which a pulp sheet is hard to be torn in the case where the composition is used in wiping cleaning using the sheet, and touch of fingers gripping the sheet in doing wiping cleaning is excellent.SOLUTION: A liquid detergent composition contains carboxymethyl cellulose or a salt thereof, water-soluble organic solvent and water, and includes the water-soluble organic solvent by 5 mass% or more and 50 mass% or less for the mass of the whole liquid detergent composition. The carboxymethyl cellulose or a salt thereof includes one having the degree of etherification of 0.8 or more. Viscosity of the liquid detergent composition at 25°C is 7 mPa s or more and 1000 mPa s or less. The liquid detergent composition further may contain surfactant by more than 0 mass% and 5 mass% or less for the total mass of the liquid detergent composition, and may contain water-insoluble oily substance.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a liquid cleaning agent composition used for wiping and cleaning using a sheet such as toilet paper.

Background Art

[0002] As a method for cleaning indoors, there is known a method of using a familiar pulp sheet such as toilet paper or tissue paper, applying a liquid cleaning agent composition thereto to make it in a wet state, and then wiping off dirt. This cleaning method is simple and low-cost, but there are problems such as low wet strength of the pulp sheet and easy breakage during wiping, and the liquid cleaning agent composition adheres to the fingers holding the pulp sheet, giving an unpleasant sticky feeling. Patent Document 1 describes a toilet cleaning agent composition capable of solving such problems, which contains a specific amphoteric surfactant, ethanol, and ethylenediaminetetraacetic acid.

[0003] Patent Document 2 describes a wiping sheet excellent in the collectability of fine dirt such as dust and the collectability of fiber dirt such as hair, which is a fiber sheet containing pulp and a binder impregnated with an aqueous agent. The aqueous agent contains carboxymethyl cellulose (CMC) having an etherification degree of 0.8 or more and 1.0 or less or a salt thereof, and has a viscosity at 25°C of 1000 mPa·s or more and 5000 mPa·s or less. The wiping sheet described in Patent Document 2 is for the purpose of improving the collectability of fine dirt and fiber dirt, and in order to achieve that purpose, CMC or a salt thereof is contained in the aqueous agent to make the viscosity of the aqueous agent a high viscosity of 1000 mPa·s or more (see

[0026] and

[0027] etc. of Patent Document 3).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem of the present invention relates to providing a liquid detergent composition that is difficult to break when used for wiping with a pulp sheet and has a good feel of the fingers holding the sheet during the wiping.

Means for Solving the Problems

[0006] The present invention is a liquid detergent composition containing carboxymethylcellulose or a salt thereof, a water-soluble organic solvent, and water. In one embodiment of the present invention, it is preferable that the water-soluble organic solvent is contained in an amount of 5% by mass or more and 50% by mass or less based on the total mass of the liquid detergent composition. In one embodiment of the present invention, it is preferable that the carboxymethylcellulose or a salt thereof includes those having an etherification degree of 0.8 or more. In one embodiment of the present invention, it is preferable that the viscosity of the liquid detergent composition at 25°C is 7 mPa·s or more and 1000 mPa·s or less.

[0007] The present invention also relates to a container containing the liquid detergent composition of the present invention. The present invention also relates to a cleaning method in which the liquid detergent composition of the present invention is applied to a fiber sheet containing cellulose fibers, and the fiber sheet is used to wipe a hard surface. The present invention also relates to a wet sheet in which a fiber sheet containing cellulose fibers is impregnated with the liquid detergent composition of the present invention. Other features, effects, and embodiments of the present invention will be described below.

Effects of the Invention

[0008] According to the present invention, there is provided a liquid detergent composition that is difficult to break when used for wiping with a pulp sheet and has a good feel of the fingers holding the sheet during the wiping.

Embodiments for Carrying Out the Invention

[0009] The liquid detergent composition of the present invention contains at least carboxymethyl cellulose (CMC) or a salt thereof (hereinafter, these are collectively also referred to as "CMCs"), a water-soluble organic solvent, and water.

[0010] In the liquid detergent composition of the present invention, the CMCs have the effect of imparting sufficient wet strength to pulp sheets such as toilet paper to which the liquid detergent composition is applied, so as to withstand wiping and cleaning. Further, when the liquid detergent composition of the present invention contains a water-insoluble oily substance such as a certain perfume component, the CMCs have the effect of improving the solubility of the water-insoluble oily substance in the liquid detergent composition. Furthermore, due to the effect of improving the solubility of the contained components by such CMCs, the liquid detergent composition of the present invention does not require the blending of a surfactant for the purpose of improving the solubility of the water-insoluble oily substance, or the blending amount of the surfactant can be reduced compared to the conventional level, so that inconveniences caused by the surfactant (such as a decrease in the finish degree after wiping and cleaning the object to be cleaned) are less likely to occur.

[0011] The liquid detergent composition of the present invention contains one or more selected from CMCs (CMC and CMC salts). A preferred example of the CMC salt is a metal salt. The metal salt can include one or more selected from alkali metal salts and alkaline earth metal salts. The alkali metal salt can include one or more selected from sodium salts and potassium salts, etc. The alkaline earth metal salt can include one or more selected from calcium salts and magnesium salts, etc. From the viewpoint of handleability during production and use, as the CMCs contained in the liquid detergent composition of the present invention, CMC salts are preferred, and among them, sodium CMC is particularly preferred.

[0012] The CMCs used in the present invention preferably include those having a predetermined degree of etherification. CMC is a derivative of cellulose, which is formed by bonding carboxymethyl groups (-CH2-COOH) to a part of the hydroxy groups of glucopyranose monomers that make up the cellulose skeleton. The carboxymethyl group is substituted with an ether bond for the alcoholic hydroxyl group of glucose, which is a constituent unit of cellulose. The degree of etherification, which is an index of the substitution degree, is the number of moles of etherification per six carbon atoms in cellulose (mol / C6). There are three alcoholic hydroxyl groups in one glucose, which is a repeating unit. Generally, the smaller the numerical value of the degree of etherification, the more likely the CMCs are to be water-insoluble. From the viewpoint of improving the dispersibility and stabilization in the liquid detergent composition, the degree of etherification of CMCs preferably includes those with a value of 0.8 or more, and more preferably includes those with a value of 0.85 or more. Also, from the viewpoint of improving the finish after wiping, the degree of etherification of CMCs preferably includes those with a value of 2 or less, more preferably includes those with a value of 1.6, and even more preferably includes those with a value of 1.1 or less. The degree of etherification can be confirmed by measuring the amount of base required to neutralize the CMCs in the sample. When measuring the degree of etherification, a back titration using a base and an acid, and an indicator such as phenolphthalein can be appropriately combined. Specifically, for example, it can be measured by the following method.

[0013] <Method for Measuring Degree of Etherification> Prepare 0.5 g or more and 0.7 g or less of the measurement target (CMCs) as a sample. When the measurement target is a CMC salt, heat it to obtain a CMC anhydrous salt. Wrap the sample in filter paper and heat it in a magnetic crucible to obtain an ashed sample. After allowing the ashed sample to stand in an environment of normal temperature and pressure until the product temperature of the ashed sample reaches about room temperature, cool the ashed sample. Then, put the ashed sample, 250 mL of water, and 35 mL of 0.05 mol / L sulfuric acid into a beaker to obtain a mixed solution. After boiling the mixed solution for 30 minutes, allow the mixed solution to stand in an environment of normal temperature and pressure until the product temperature of the mixed solution reaches about room temperature. Then, add phenolphthalein indicator to the mixed solution and back-titrate the excess acid remaining in the mixed solution with 0.1 mol / L potassium hydroxide aqueous solution. Based on the titration amount of potassium hydroxide, calculate the degree of etherification from the following formulas (1) and (2). A = [((a × f) - (b × f')) / C] - P ··· Formula (1) Degree of etherification (mol / C6) = G × A / (10000 - (J × A) ··· Formula (2) The details of the above Formulas (1) and (2) are as follows. · A: Amount of 0.05 mol / L sulfuric acid consumed per 1 g of sample [mL / g] · a: Amount of 0.05 mol / L sulfuric acid used [mL] · f: Valence coefficient of 0.05 mol / L sulfuric acid · b: Titration amount of 0.1 mol / L potassium hydroxide [mL] · f': Valence coefficient of 0.1 mol / L potassium hydroxide · C: Mass of sample [g] · P: Alkalinity [mL / g] · G: Molecular weight of glucose (162) · J: Difference between the molecular weight of CH2COONa and the molecular weight of hydrogen (80)

[0014] The alkalinity P can be measured, for example, by the following method. Prepare about 1 g of the measurement target (CMCs) as a sample. When the measurement target is a CMC salt, heat it to obtain a CMC anhydrous salt. Put the sample and 200 mL of water into a beaker to obtain a mixed solution. Add 5 mL of 0.05 mol / L sulfuric acid to the mixed solution, boil it for 10 minutes, and then let the mixed solution stand in an environment of normal temperature and pressure until the temperature of the mixed solution drops to about room temperature. Then, add phenolphthalein indicator to the mixed solution and titrate it with 0.1 mol / L potassium hydroxide aqueous solution. Also, conduct a blank test and calculate the alkalinity P from the following formula (3). P=(b - s)×f’ / C ··· Formula (3) The details of the above formula (3) are as follows. ·b: Titration volume of 0.1 mol / L potassium hydroxide [mL] ·s: Titration volume of 0.1 mol / L potassium hydroxide in the blank test [mL] ·f’: Valence coefficient of 0.1 mol / L potassium hydroxide ·C: Mass of the sample [g]

[0015] The content of CMCS in the liquid detergent composition of the present invention (when containing two or more types of CMCS, their total content) is preferably 0.02% by mass or more, more preferably 0.2% by mass or more, and preferably 1% by mass or less, more preferably 0.8% by mass or less, based on the total mass of the liquid detergent composition, from the viewpoint of stably expressing the action effects of CMCS with a necessary and sufficient content.

[0016] In the liquid detergent composition of the present invention, the water-soluble organic solvent, in addition to the effect of improving the dispersibility of the components contained in the liquid detergent composition, further has the effect of imparting sufficient wet strength to pulp sheets such as toilet paper to which the liquid detergent composition is applied to withstand wiping. As described above, since such a sheet wet strength improvement effect is also possessed by CMCS, the liquid detergent composition of the present invention containing CMCS and a water-soluble organic solvent is excellent in the sheet wet strength improvement effect.

[0017] The liquid detergent composition of the present invention contains one or two or more water-soluble organic solvents. The water-soluble organic solvent can include one or more selected from alcohols, polyols, and glycol ethers. The alcohols can include monohydric alcohols. The monohydric alcohols can include one or more selected from methanol, ethanol, isopropyl alcohol, etc. The polyols can include one or more selected from alkylene glycols, polyalkylene glycols, and glycerols. The alkylene glycols can include one or more selected from ethylene glycol, propylene glycol, 1,3 - propanediol, 1,3 - butanediol, etc. The polyalkylene glycols can include one or more selected from diethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, sorbitol, etc. The glycerols can include one or more selected from glycerol, diglycerol, triglycerol, etc. The glycol ethers can include one or more selected from ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monopropyl ether, diethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and ethylene glycol monophenyl ether. From the viewpoint of the effect of improving the wet strength of the sheet, it is preferable that the water - soluble organic solvent contained in the liquid detergent composition of the present invention contains ethanol.

[0018] From the viewpoint of sufficiently exhibiting the effects of the water - soluble organic solvent such as the effect of improving the wet strength of the sheet, the content of the water - soluble organic solvent in the liquid detergent composition of the present invention (when containing two or more water - soluble organic solvents, the total content thereof) is preferably 5% by mass or more, and more preferably 10% by mass or more, based on the total mass of the liquid detergent composition. From the viewpoint of ensuring the solubility of highly hydrophobic components (water-insoluble oily substances) such as fragrance components with excellent residual fragrance properties in the liquid detergent composition, the content is preferably 50% by mass or less, more preferably 40% by mass or less, based on the total mass of the liquid detergent composition.

[0019] From the viewpoint of improving the solubility of CMCS, the water content in the liquid detergent composition of the present invention is preferably 45% by mass or more, more preferably 50% by mass or more, still more preferably 60% by mass or more, and preferably 95% by mass or less, more preferably 90% by mass or less, based on the total mass of the liquid detergent composition.

[0020] In addition to the above components (CMCS, water-soluble organic solvents, and water), the liquid detergent composition of the present invention may further contain a surfactant. By including a surfactant in the liquid detergent composition, an improvement in the dispersibility of other contained components of the liquid detergent composition can be expected. Further, when the liquid detergent composition contains a water-insoluble oily substance such as a certain fragrance component, by including a surfactant in the liquid detergent composition, the solubility of the water-insoluble oily substance in the liquid detergent composition can be improved. However, as described above, since the liquid detergent composition of the present invention contains CMCS and thus has basically high solubility of water-insoluble oily substances, the content of the surfactant for the purpose of improving the solubility of water-insoluble oily substances can be relatively small. Specifically, as described later, the content of the surfactant in the liquid detergent composition of the present invention is typically sufficient at about 5% by mass or less based on the total mass of the liquid detergent composition.

[0021] Examples of the surfactant include ionic surfactants, nonionic surfactants, and amphoteric surfactants, and in the present invention, one of these can be used alone or two or more thereof can be used in combination. The ionic surfactant can include one or more selected from cationic surfactants and anionic surfactants. The cationic surfactant can include one or more selected from benzalkonium cetyl phosphate, benzyldimethylammonium chloride, benzalkonium chloride, cetylpyridinium chloride, and the like. The anionic surfactant can include one or more selected from alkylbenzene sulfonic acid and the like. The nonionic surfactant can include one or more selected from glycerin fatty acid esters, propylene glycol fatty acid esters, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbitol tetraoleate, polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxypropylene glycols, polyethylene glycol fatty acid esters, polyoxyethylene hydrogenated castor oil, alkyl alkanolamides, polyoxyethylene alkyl amines, and alkyl glucosides. The glycerin fatty acid ester can include one or more selected from polyglycerin fatty acid esters, glycerin monostearate, and the like. The propylene glycol fatty acid ester can include one or more selected from propylene glycol monocaprylate and the like. The sorbitan fatty acid ester can include one or more selected from sorbitan monooleate and the like. The polyoxyethylene sorbitan fatty acid ester can include one or more selected from polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, and the like. The polyoxyethylene alkyl ether can include one or more selected from polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, and the like. The polyoxyethylene alkyl phenyl ether can include one or more selected from polyoxyethylene nonyl phenyl ether and the like. The polyethylene glycol fatty acid ester can contain one or more selected from polyethylene glycol monolaurate, polyethylene glycol monostearate, and the like. The alkyl alkanolamide can contain one or more selected from palm kernel oil fatty acid diethanolamide, coconut oil fatty acid N-methyl ethanolamide, and the like. The alkyl glucoside can contain one or more selected from alkyl glucosides such as capryl glucoside, decyl glucoside, and lauryl glucoside. The amphoteric surfactant can contain one or more selected from alkyl dimethylamino acetic acid betaine, alkyl dimethylamine oxide, alkyl carboxy betaine, and alkyl sulfo betaine. The alkyl dimethylamine oxide can contain one or more selected from lauryl dimethylamine oxide and the like.

[0022] When a surfactant is contained in the liquid detergent composition of the present invention, the content of the surfactant in the liquid detergent composition (when two or more surfactants are contained, the total content thereof) is preferably more than 0% by mass, more preferably 0.05% by mass or more, still more preferably 0.1% by mass or more, and preferably 5% by mass or less, more preferably 3% by mass or less, still more preferably 1% by mass or less, from the viewpoint of stably expressing the action effect by the surfactant at a necessary and sufficient content with respect to the total mass of the liquid detergent composition.

[0023] In addition to the above components (CMCs, water-soluble organic solvents, and water), the liquid detergent composition of the present invention may further contain a water-insoluble oily substance. The water-insoluble oily substance is typically used to impart some function to the liquid detergent composition, and specific examples include perfume components. In the present invention, one kind of the water-insoluble oily substance can be used alone or in combination of two or more kinds. Examples of the perfume component which is a water-insoluble oily substance include geraniol, linalool, citronellol, nerol, hydroxycitronellol, tetrahydrogeraniol, terpineol, cis-3-hexenol, phenylethyl alcohol, benzyl alcohol, limonene, γ-undecalactone, 1-(2,6,6-trimethyl-1,3-cyclohexadien-1-yl)-2-buten-1-one, 7-acetyl-1,2,3,4,5,6,7,8-octahydro-1,1,6,7-tetramethylnaphthalene, cedryl methyl ketone, 3,7-dimethyl-7-methoxyoctan-2-ol, dodecahydro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan.

[0024] When the liquid detergent composition of the present invention contains a water-insoluble oily substance, the content of the water-insoluble oily substance in the liquid detergent composition (when two or more water-insoluble oily substances are contained, their total content) may vary depending on the type of the water-insoluble oily substance and the like. For example, when using the above-described perfume component as the water-insoluble oily substance, from the viewpoint of stably expressing the action and effect of the perfume component (water-insoluble oily substance) at a necessary and sufficient content, it is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, based on the total mass of the liquid detergent composition. Also, when using the above-described perfume component, from the viewpoint of suppressing the stickiness of the liquid detergent composition, it is preferably 3% by mass or less, more preferably 2% by mass or less, still more preferably 1% by mass or less, based on the total mass of the liquid detergent composition.

[0025] The liquid detergent composition of the present invention may contain other components (excluding the above components (CMCs, water-soluble organic solvents, water, surfactants, and water-insoluble oily substances)) on the condition that the predetermined effects of the present invention described above are not inhibited. Examples of the other components include cross-linking agents for CMCs, preservatives, pigments, perfumes, pH adjusters, etc., and they can be used singly or in combination of two or more. The cross-linking agent for CMCs can include polyvalent metal salts, particularly water-soluble salts of polyvalent metals. As the polyvalent metal, it can contain one or more selected from alkaline earth metals, manganese, zinc, cobalt, and nickel. The alkaline earth metal can contain one or more selected from calcium, strontium, barium, etc. The polyvalent metal salt can contain, for example, one or more selected from hydroxides, chlorides, sulfates, nitrates, carbonates, formates, and acetates of the polyvalent metal. From the viewpoint of preventing wiping marks and improving the finish after wiping, it is preferable that the liquid detergent composition does not contain the polyvalent metal salt. Details of this point will be described later.

[0026] The composition of the liquid detergent composition of the present invention can be analyzed according to a conventional method using known analytical means. When the liquid detergent composition to be measured, like the wet sheet described later, is impregnated in the sheet, the squeezed liquid collected by squeezing the sheet is used as the measurement sample. In the composition analysis of the liquid detergent composition, organic analysis and inorganic ion analysis are carried out. In the organic analysis, typically, known analytical means such as analysis by NMR spectroscopy (hereinafter also referred to as "NMR analysis") and electrospray ionization mass spectrometry (hereinafter also referred to as "ESI / MS analysis") are used to identify the contained components, 1 and the contained components are quantified by the internal standard method using the 1H-NMR spectrum. The organic analysis can be carried out, for example, according to the following procedure. First, NMR analysis is performed on the measurement sample (for example, the squeezed liquid) and its concentrate, 1 and a 1H-NMR spectrum is obtained. Next, methanol is added to the concentrate of the measurement sample and centrifuged to separate it into a methanol-soluble fraction and a methanol-insoluble fraction. Next, the contained components of the methanol-soluble fraction are fractionated by gel permeation chromatography (GPC), and NMR analysis and / or ESI / MS analysis are performed on each fractionated component. An example of the GPC fractionation conditions is as follows. (An example of GPC fractionation conditions) · Column: GS310 (500×20 mm I.D., manufactured by Showa Denko K.K., exclusion limit molecular weight 40,000) · Mobile phase solvent: Methanol (3.5 mL / min.) In the inorganic ion analysis, typically, the measurement sample (e.g., the squeezing liquid) is precisely weighed, diluted to a pure and constant volume after dilution and solid-phase extraction, and then quantified by ion chromatography (IC).

[0027] As described above, the liquid detergent composition of the present invention may contain CMCS, water-soluble organic solvents, water, surfactants, and water-insoluble oily substances, and the content of each of these components can be measured by the above method or a method equivalent thereto. For example, the content of CMCS in the liquid detergent composition can be measured by GPC. Specifically, first, 1 g of the target sample (liquid detergent composition) is sampled, and distilled water is added to obtain a sample solution with a total volume of 10 g. Next, while stirring the sample solution, it is heated under the condition that the temperature of the sample solution is maintained at 70 °C for 30 minutes. Next, after cooling the sample solution to room temperature, centrifugation is performed at 5000 rpm for 30 minutes. Then, 100 μL of the supernatant of the sample solution after centrifugation is subjected to GPC analysis, and comparative analysis is performed with a standard product of CMC using the obtained GPC chromatogram to quantify the CMCS in the target sample. The GPC analysis conditions are as follows. (GPC analysis conditions) · Column: Tosoh TSKgel G5000pwxl + TSKgel G4000pwxl + · Column temperature: 40 °C · Eluent: 0.2 M phosphate buffer (adjusted to pH 6.8 with 6 N NaOH) · Flow rate: 1 mL / min · Sample injection volume: 100 μL

[0028] The liquid detergent composition of the present invention can be obtained by mixing the above-described various components. The liquid detergent composition of the present invention is liquid at normal temperature and normal pressure. Here, "normal temperature and normal pressure" refers to an environment with an ambient temperature of 25 °C and a pressure of 1 atm.

[0029] The viscosity of the liquid detergent composition of the present invention at 25°C is 10 mPa·s or more and 1000 mPa·s or less. The "viscosity of the liquid detergent composition" referred to here is the viscosity measured by a B-type viscometer (product number: M92VB-10M, manufactured by Shiro Sangyo Co., Ltd.). Specifically, the measured value 3 minutes after placing the rotor of the B-type viscometer in the liquid detergent composition (object to be measured) at a product temperature of 25°C and rotating the rotor at a rotational speed of 60 rpm can be used as the viscosity of the liquid detergent composition at 25°C. As the rotor, M1 to 4 rotors can be used. When the liquid detergent composition is used for wiping and cleaning using a pulp sheet such as toilet paper, from the viewpoint of improving the bonding strength between the cellulose fibers constituting the sheet and making the sheet less likely to tear, the viscosity of the liquid detergent composition at 25°C is preferably 7 mPa·s or more, more preferably 10 mPa·s or more, and even more preferably 30 mPa·s or more. Also, from the viewpoint of improving the feel during wiping, the viscosity of the liquid detergent composition at 25°C is preferably 1000 mPa·s or less, and more preferably 300 mPa·s or less. The viscosity of the liquid detergent composition at 25°C can be adjusted, for example, by adjusting the content of one or more of CM Cs, water-soluble organic solvents, and water.

[0030] The liquid detergent composition of the present invention can be used for wiping and cleaning using a fiber sheet containing cellulose fibers, and is useful as the liquid detergent composition for wiping. The fiber sheet is preferably a sheet mainly composed of cellulose fibers, that is, the aforementioned pulp sheet. In other words, a sheet having a cellulose fiber content of 90% by mass or more and 100% by mass or less with respect to the total mass of the sheet in a dry state is referred to. The type of cellulose fiber is not particularly limited, and can include one or more selected from bleached wood pulp, natural pulp, recycled pulp, mercerized pulp that has been chemically treated and swollen with alkali, chemically cross-linked pulp having a helical structure, and microfibrillated cellulose. The bleached wood pulp can contain one or more selected from softwood sun-dried kraft pulp, softwood sun-dried sulfite pulp, hardwood sun-dried kraft pulp, etc. The natural pulp can contain one or more selected from cotton, hemp, etc. The recycled pulp can contain one or more selected from rayon, lyocell, cupra, etc. Examples of the fiber sheet include paper, woven fabric, and non-woven fabric, and it can be appropriately selected according to the type of the object to be cleaned, etc. Typically, the wiping and cleaning is performed by gripping the fiber sheet holding the liquid cleaning composition of the present invention with fingers and wiping the surface of the object to be cleaned with the fiber sheet. The method of holding the liquid cleaning composition on the fiber sheet is not particularly limited, and examples thereof include a method of applying or spraying the liquid cleaning composition on the fiber sheet, and a method of immersing the fiber sheet in the liquid cleaning composition.

[0031] The object to be cleaned is not particularly limited and can include a hard surface. The hard surface can contain one or more selected from a part of a building, fixtures, furniture, plumbing, other equipment and articles. The part of the building can contain one or more selected from a floor surface, a wall surface, etc. The fixtures can contain one or more selected from a closet, window glass, mirror, door, doorknob, etc. The furniture can contain one or more selected from a desk, etc. The plumbing can contain one or more selected from a toilet, a washroom, a kitchen, etc.

[0032] Since the liquid detergent composition of the present invention is excellent in the effect of improving the wet strength of the sheet as described above, it is useful for wiping cleaning using a fiber sheet having inherently low wet strength. As such a fiber sheet with low wet strength, toilet paper can be mentioned. That is, the liquid detergent composition of the present invention is useful for toilet cleaning (such as wiping the toilet bowl) using toilet paper, the toilet paper is less likely to tear during wiping, and the feel of the fingers holding the toilet paper is good. Further, when the liquid detergent composition of the present invention contains a fragrance component, it is possible to impart a fragrance to the cleaning target, and moreover, inconveniences (such as being likely to leave wiping marks) that are a concern when using a conventional liquid detergent composition capable of imparting a fragrance are less likely to occur, and a high level of satisfaction can be obtained regarding the finish after wiping the cleaning target.

[0033] The present invention includes a set of the liquid detergent composition of the present invention described above and a container for containing the liquid detergent composition. The container only needs to be able to store, preferably seal, the liquid detergent composition of the present invention, and the shape and size are not particularly limited. The material of the container is also not particularly limited, and the container can be, for example, a plastic container or a metal container. The container may be provided with a content applying means capable of applying the content of the container to the cleaning target or the sheet used for wiping cleaning. As one embodiment of the set of the present invention provided with the content applying means, a form in which a container equipped with a sprayer is filled with the liquid detergent composition of the present invention can be mentioned. In such a form, by operating the sprayer according to a conventional method, the liquid detergent composition in the container can be sprayed outside the container. The sprayer may be an aerosol sprayer using a propellant such as gas (the container is filled with the propellant), or a manual trigger sprayer not using the propellant. As another embodiment of the set of the present invention provided with the content applying means, a form in which a roll-on container is filled with the liquid detergent composition of the present invention can be mentioned. A roll-on container is a container in which a stopper that rotatably holds a ball is arranged at the container mouth, and the content (liquid detergent composition) is distributed on the surface of the ball and applied to a desired part.

[0034] When the liquid detergent composition of the present invention is used for wiping with a pulp sheet, the sheet is less likely to tear, and in addition to the effect that the feel of the fingers holding the sheet during wiping is good (hereinafter also referred to as the "first effect"), it can exhibit the effect that a fragrance component excellent in residual fragrance property can be blended (hereinafter also referred to as the "second effect"). The fragrance component is as described above and is a kind of water-insoluble oily substance. In this type of liquid detergent composition, a fragrance may be blended for the purpose of improving the commercial value, etc. In particular, for a liquid detergent composition used in a toilet or the like, the persistence of the fragrance (residual fragrance property) in the space after cleaning is required. However, fragrance components excellent in residual fragrance property generally have strong hydrophobicity. When such a fragrance component is blended into a typical liquid detergent composition, there is a problem that the fragrance component is hardly dissolved in the liquid detergent and a sufficient amount of the fragrance component cannot be blended. As a method of solubilizing a highly hydrophobic fragrance component, a method of increasing the content of a surfactant in the liquid detergent composition can be considered. However, in that method, the surfactant may remain on the cleaning target and leave wiping marks, and the finish after wiping the cleaning target may be deteriorated. Japanese Patent Application Laid-Open No. 2015-21076 describes a wiping detergent composition capable of solving the problems caused by such a fragrance component, which contains three specific surfactants, ethanol, and a specific fragrance component in a specific ratio. Since the liquid detergent composition of the present invention has the above-described composition and physical properties not described in Patent Document 2, the first effect and the second effect can be exhibited, and thus it is particularly useful for toilet cleaning using a fiber sheet mainly composed of natural cellulose fibers (a sheet with relatively low strength and easy to tear) such as toilet paper.

[0035] When the liquid detergent composition of the present invention is used as a liquid detergent composition for toilet cleaning, it preferably has the following characteristics. Regarding points not described for the liquid detergent composition for toilet cleaning, the description of the liquid detergent composition of the present invention described above is appropriately applied. The content of CM Cs in the liquid cleaning composition for toilet cleaning is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, and preferably 1% by mass or less, more preferably 0.5% by mass or less, based on the total mass of the liquid cleaning composition. As a result, the action and effect of CM Cs can be made more stable, and in toilet cleaning where a sheet impregnated with the liquid cleaning composition for toilet cleaning is held with fingers, effects such as the sheet being less likely to be damaged are achieved. As the water-soluble organic solvent, it is preferable to use one or more selected from ethanol, propylene glycol monoethyl ether, and propylene glycol. As a result, in toilet cleaning where a sheet impregnated with the liquid cleaning composition for toilet cleaning is held with fingers, effects such as the sheet being less likely to be damaged are achieved. When the water-insoluble oily substance (fragrance component) contains a fragrance, the content of the fragrance in the liquid cleaning composition for toilet cleaning is preferably 0.05% by mass or more, more preferably 0.2% by mass or more, and preferably 1% by mass or less, more preferably 0.5% by mass or less, based on the total mass of the liquid cleaning composition. As the fragrance component, it is preferable to use one or more selected from limonene, geraniol, and citronellol. As a result, the solubility of the fragrance component in the liquid cleaning composition for toilet cleaning is improved, and in toilet cleaning, effects such as improving the persistence of the fragrance in the space after cleaning without reducing the finish degree after wiping are achieved. As the surfactant, it is preferable to use one or more selected from decyl glucoside and lauryl dimethylamine oxide. As a result, in toilet cleaning, it has the advantage that no wiping streaks remain. The viscosity of the liquid cleaning composition for toilet cleaning at 25°C is preferably 7 mPa·s or more, more preferably 10 mPa·s or more, and preferably 300 mPa·s or less, more preferably 100 mPa·s or less. As a result, in toilet cleaning where a sheet impregnated with the liquid cleaning composition for toilet cleaning is held with fingers, the damage to the sheet can be prevented, and effects such as stickiness of the fingers and the cleaning target (such as a toilet bowl) can be prevented are achieved.

[0036] In addition to the first effect, the liquid detergent composition of the present invention can exhibit an effect that wiping marks are less likely to remain when used for wiping and cleaning (hereinafter, also referred to as "the third effect"). When a conventional liquid detergent composition is impregnated into a fiber sheet such as a non-woven fabric and used to wipe and clean a hard surface such as a floor or a window glass, linear or other wiping marks may remain on the hard surface, and there is room for improvement in the finish of the wiping and cleaning. According to the liquid detergent composition of the present invention, since it has the above-described composition and physical properties, when used for wiping and cleaning a hard surface, wiping marks are less likely to remain on the hard surface, and a highly satisfactory finish can be obtained.

[0037] When the liquid detergent composition of the present invention is used as a liquid detergent composition for wiping and cleaning hard surfaces, it preferably has the following characteristics. Regarding points not described for the liquid detergent composition for wiping and cleaning hard surfaces, the description of the liquid detergent composition of the present invention described above is appropriately applied. The viscosity of the liquid detergent composition for wiping and cleaning hard surfaces at 25°C is preferably in the same range as that of the liquid detergent composition for toilet cleaning. In the liquid detergent composition for wiping and cleaning hard surfaces, by setting the viscosity at 25°C to be equal to or lower than the above upper limit (300 mPa·s), the composition can penetrate into the sheet more quickly compared to the case where the viscosity exceeds the upper limit, so that wiping and cleaning of hard surfaces can be performed easily. As the water-soluble organic solvent, it is preferable to use one or more selected from ethanol and propylene glycol monomethyl ether. This has the advantage of fast drying in wiping and cleaning hard surfaces. As the surfactant, it is preferable to use one or more selected from decyl glucoside and lauryl dimethylamine oxide. This has the advantage that wiping streaks do not remain in wiping and cleaning hard surfaces.

[0038] When a fiber sheet contains synthetic fibers, an oil agent such as a surfactant contained in the synthetic fibers may transfer to a cleaning target such as a hard surface during wiping and cleaning, and wiping marks may be formed. Therefore, from the viewpoint of more surely achieving the third effect, it is preferable that the fiber sheet impregnated with the liquid detergent composition substantially does not contain synthetic fibers. Here, "substantially does not contain" means that the proportion (synthetic fiber occupancy ratio) of the contained mass of synthetic fibers in the total mass of all fibers contained in the fiber sheet is preferably 10% by mass or less, more preferably 20% by mass or less, and most preferably zero. As an example of a fiber sheet substantially not containing synthetic fibers, a "fiber sheet mainly composed of natural cellulose fibers" (hereinafter, also referred to as "fiber sheet A") can be mentioned. Examples of the natural cellulose fibers include wood pulp. The form of the fiber sheet A is not particularly limited, and can be, for example, paper, woven fabric, or non-woven fabric. The proportion (natural cellulose fiber occupancy ratio) of the contained mass of natural cellulose fibers in the total mass of all fibers contained in the fiber sheet A is preferably 80% by mass or more, more preferably 90% by mass or more, and most preferably 100% by mass.

[0039] While the fiber sheet A has the merit of being difficult to leave wiping marks, in terms of strength, generally, a fiber sheet containing synthetic fibers is more advantageous, and there is room for improvement. By including a polyvalent metal salt such as zinc sulfate in the liquid detergent composition used in combination with the fiber sheet A, the strength of the fiber sheet A can be improved. When wiping and cleaning is performed with this sheet, white linear wiping marks derived from the polyvalent metal salt may remain on the cleaning target such as a hard surface, and there is room for further improvement. Therefore, in particular, for the fiber sheet constituting the wet sheet for wiping and cleaning hard surfaces, it is preferable to use a fiber sheet that can withstand wiping and cleaning and can surely achieve the third effect.

[0040] As a preferable example of the fiber sheet constituting the wet sheet for wiping hard surfaces, a fiber sheet mainly composed of rayon (hereinafter also referred to as "fiber sheet B") can be mentioned. Here, the term "mainly composed of" means that the proportion of the contained mass of rayon (rayon occupancy rate) in the total mass of all fibers contained in the fiber sheet B is preferably 60% by mass or more, more preferably 70% by mass or more. The rayon occupancy rate of the fiber sheet B may be 100% by mass. The fiber sheet B may contain other fibers other than rayon, and examples of the other fibers include various synthetic fibers. By the fiber sheet B containing synthetic fibers in addition to rayon as constituent fibers, the strength can be improved as compared with the case where only rayon is contained as constituent fibers. The form of the fiber sheet B is not particularly limited, and it can be, for example, paper, woven fabric, or non-woven fabric. The constituent fibers of the fiber sheet B including rayon may contain an oil agent that can cause wiping marks. However, as a result of the study by the present inventors, it has been found that the fiber sheet B is difficult to leave wiping marks. The reason is considered to be that since the CM Cs contained in the liquid detergent composition used in combination with the fiber sheet B have a dispersing effect, the oil agent is uniformly dispersed in the liquid detergent composition, making it difficult for wiping marks to occur after wiping. It is also considered that even if wiping marks occur on the object to be wiped during wiping, the wiping marks are removed by being scraped off by the fine irregularities on the surface of the fiber sheet B.

[0041] As another preferable example of the fiber sheet constituting the wet sheet for wiping hard surfaces, a laminated sheet including the fiber sheet B can be mentioned. Specifically, it preferably has a three-layer structure composed of an inner layer and two outer layers located on both sides in the thickness direction of the inner layer and adjacent to the inner layer. It is preferable that the inner layer includes a fiber sheet (fiber sheet A) mainly composed of natural cellulose fibers. It is preferable that the outer layer includes a fiber sheet (fiber sheet B) mainly composed of rayon. The laminated sheet including the fiber sheets A and B is hereinafter also referred to as "fiber sheet C". The fiber sheet C is configured such that a part of it is composed of the fiber sheet A mainly made of natural cellulose fibers, thereby reducing the oil agent which is the cause of wiping marks. Also, the fiber sheet A is arranged in the inner layer of the three-layer structure, and the outer layer that comes into contact with the object to be cleaned is composed of the fiber sheet B, so that it has the strength to withstand the wiping and cleaning process and can also prevent the fibers from falling off during the wiping and cleaning process. In addition, it enables to achieve a highly satisfactory finish without wiping marks. The basis weight of the inner layer is preferably 10 g / m 2 or more, more preferably 15 g / m 2 or more, and preferably 30 g / m 2 or less, more preferably 25 g / m 2 or less. Thereby, the effect of using the fiber sheet mainly made of natural cellulose fibers, specifically, the effect that it is less likely to cause wiping marks on the object to be cleaned can be more surely achieved. The basis weight of the outer layer is preferably 10 g / m 2 or more, more preferably 20 g / m 2 or more, and preferably 50 g / m 2 or less, more preferably 40 g / m 2 or less. Thereby, the effect of using the fiber sheet mainly made of rayon, specifically, the effect that the sheet strength required for wiping and cleaning can be ensured can be more surely achieved.

Examples

[0042] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to such examples.

[0043] 〔Examples 1 to 20, Comparative Examples 1 to 10: Liquid detergent compositions〕 The components described in the column of "Composition of the liquid detergent composition (mass%)" in Tables 1 to 3 below were mixed to produce liquid detergent compositions. The details of those used as the components of the liquid detergent composition are as follows. · CMCA: Sodium CMC, "Sunrose FT-3" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.80 or more and 1.00 or less · CMC Class B: Sodium CMC, "Sunrose F04HC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.80 or more and 1.00 or less · CMC Class C: Sodium CMC, "Sunrose F35SH" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 1.00 or more and 1.10 or less · CMC Class D: Sodium CMC, "Sunrose F60HC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.80 or more and 1.00 or less · CMC Class E: Sodium CMC, "Sunrose F350HC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.80 or more and 1.00 or less · CMC Class F: Sodium CMC, "Sunrose SLD-F1" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.20 or more and 0.30 or less · CMC Class G: Sodium CMC, "Sunrose F10LC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.55 or more and 0.65 or less · CMC Class H: Sodium CMC, "Sunrose F20LC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.55 or more and 0.65 or less · CMC Class I: Sodium CMC, "Sunrose F50MC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.65 or more and 0.75 or less · CMC Class J: Sodium CMC, "MAC200HC" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 0.85 or more and 0.95 or less · CMC Class K: Sodium CMC, "A10SH" manufactured by Nippon Paper Industries Co., Ltd., degree of etherification 1.30 or more and 1.60 or less · CMC Class L: Sodium CMC, "1330" manufactured by Daicel Corporation, degree of etherification 1.00 or more and 1.50 or less · Water-insoluble oily substance: fragrance component, "U-CTFF-1" manufactured by Kao Corporation

[0044] 〔Evaluation Test 1〕 For the liquid detergent compositions of each example and comparative example, the viscosity at 25°C was measured by the above method, and five evaluation items of liquid appearance, sheet breakage prevention, touch, residual fragrance, and finish were evaluated by the following methods. The evaluations by the following methods were all conducted by researchers developing cleaning products. The results are shown in Tables 1 to 3 below. The fiber sheet used in the following method was toilet paper in a rectangular shape in plan view with dimensions of 11.5 cm × 45.0 cm (product name "Scotty (Double)" manufactured by Nippon Paper Crecia Co., Ltd.). After folding it in half in one direction, it was then folded in half in a direction perpendicular to that direction, that is, it was a toilet paper folded four times.

[0045] <Method for Evaluating Liquid Appearance> The liquid detergent composition to be evaluated was placed in a colorless and transparent glass bottle. The glass bottle was allowed to stand, and the liquid detergent composition was visually observed in a stationary state, and evaluated according to the following evaluation criteria. (Evaluation Criteria for Liquid Appearance) A: Colorless and transparent. B: Slightly turbid. C: Turbid. D: Precipitation or separation is observed.

[0046] <Method for Evaluating Sheet Breakage Prevention> After applying 1 mL of the liquid detergent composition to be evaluated to the entire fiber sheet, the fiber sheet was grasped with fingers, and one side (hard surface) of a polypropylene flat plate in a square shape in plan view with sides of 30 cm was wiped and cleaned with the fiber sheet. In the wiping and cleaning, the force pressing the fiber sheet against the flat plate side was kept constant, and after moving one side of the flat plate from one end to the other end in one direction, a reciprocating motion of moving in the reverse direction was performed. The reciprocating motion was continuously performed until the fiber sheet was damaged, and the number of reciprocating motions completed at the time when the fiber sheet was damaged was evaluated according to the following evaluation criteria. (Evaluation Criteria for Sheet Breakage Prevention) A: The number of reciprocating motions is 30 or more. B: The number of reciprocating motions is 10 or more and 29 or less. C: The number of reciprocating motions is 5 or more and 9 or less. D: The number of reciprocating motions is 4 or less.

[0047] <Method for Evaluating Touch> After applying 1 mL of the liquid detergent composition to be evaluated to the entire fiber sheet, the fiber sheet was grasped with fingers, and one side (hard surface) of a polypropylene flat plate in the shape of a square with a side length of 30 cm in plan view was wiped and cleaned with the fiber sheet. In the wiping and cleaning, the force pressing the fiber sheet against the flat plate was kept constant, and after moving one side of the flat plate from one end to the other end in one direction, a reciprocating motion of moving in the reverse direction was performed 5 times. After the completion of the reciprocating motion, the feeling of the fingers holding the fiber sheet was evaluated according to the following evaluation criteria. Note that, as a reference, the case where glycerin itself was used for evaluation was designated as D. (Evaluation criteria for the feeling) A: No stickiness is felt. B: Slight stickiness is felt. C: Somewhat strong stickiness is felt. D: Strong stickiness is felt.

[0048] <Method for evaluating the residual fragrance> After applying 1 mL of the liquid detergent composition to be evaluated to the entire fiber sheet, the fiber sheet was grasped with fingers, and one side (hard surface) of a polypropylene flat plate in the shape of a square with a side length of 10 cm in plan view was wiped and cleaned with the fiber sheet. In the wiping and cleaning, the force pressing the fiber sheet against the flat plate was kept constant, and after moving one side of the flat plate from one end to the other end in one direction, a reciprocating motion of moving in the reverse direction was performed 5 times. One hour after the completion of the reciprocating motion, the odor of the wiped surface on the flat plate was smelled and evaluated according to the following evaluation criteria. (Evaluation criteria for the residual fragrance) 5 points: The fragrance of the fragrance component (water-insoluble oily substance) is strongly smelled. 4 points: The fragrance of the fragrance component (water-insoluble oily substance) is clearly smelled. 3 points: The fragrance of the fragrance component (water-insoluble oily substance) can be easily recognized. 2 points: The fragrance of the fragrance component (water-insoluble oily substance) faintly smells. 1 point: The fragrance of the fragrance component (water-insoluble oily substance) smells very faintly. 0 point: The fragrance of the fragrance component (water-insoluble oily substance) is not felt at all.

[0049] <Method for Evaluating Finish> After applying 1 mL of the liquid detergent composition to be evaluated to the entire fiber sheet, the fiber sheet was grasped with fingers, and the surface of a black tile (black hard surface) in the shape of a square with a side length of 10 cm in plan view was wiped and cleaned with the fiber sheet. In the wiping and cleaning, the force pressing the fiber sheet against the black tile side was kept constant, and after moving the surface of the black tile from one end in one direction to the other end, a reciprocating motion of moving in the reverse direction was performed 5 times. After the wiping and cleaning, the black tile was left standing in an environment of normal temperature and pressure to naturally dry its surface, and then the surface was visually observed and evaluated according to the following evaluation criteria. (Evaluation Criteria for Finish) A: No wiping marks are visible. A´: Slight white linear wiping marks are visible, but at a level that is not bothersome. B: White linear wiping marks are partially visible. C: White linear wiping marks are entirely visible.

[0050] [Table 1]

[0051] As shown in Table 1, since the liquid detergent compositions of each example contained CMCS and the content of the water-soluble organic solvent was 5% by mass or more and 50% by mass or less, all five evaluation items had excellent results.

[0052] [Table 2]

[0053] As shown in Table 2, since the liquid detergent compositions of each example had a viscosity at 25 °C of 7 mPa·s or more and 1000 mPa·s or less and the degree of etherification of CMCS (sodium CMC) was 0.8 or more, all five evaluation items had excellent results.

[0054] [Table 3]

[0055] [Example S1: Wet Wipe] The components described in the column of "Composition of Liquid Detergent Composition (mass%)" in Table 4 below were mixed to produce a liquid detergent composition, and the fiber sheet was impregnated with the liquid detergent composition so that the impregnation rate was 250% by mass to produce a wet wipe. Fiber sheet C was used as the fiber sheet. The fiber sheet C had a rectangular shape in plan view with a length of 285 cm and a width of 205 cm, and the basis weight was 65 g / m 2 It was. The inner layer contained 100% by mass of natural cellulose fibers (pulp fibers), and the basis weight was 17 g / m 2 It was. The outer layer contained 100% by mass of synthetic fibers, and the synthetic fibers contained 80% by mass of rayon and 20% by mass of core-sheath composite fibers. The core-sheath composite fiber had a core made of polypropylene resin and a sheath made of polyethylene resin. The fiber sheet C was produced by forming the outer layer on each of both sides of the inner layer separately produced by the wet papermaking method according to a conventional method by the spunlace method. The manufacturing method of the inner layer is the same as the manufacturing method of the fiber sheet A described later.

[0056] [Example S2: Wet Wipe] In Example S1, a wet wipe was produced in the same manner as in Example S1, except that fiber sheet B, that is, a fiber sheet mainly composed of rayon, was used instead of fiber sheet B. The fiber sheet B had a rectangular shape in plan view with a length of 285 cm and a width of 205 cm, had a single-layer structure, and the basis weight was 55 g / m 2 It was. The fiber sheet B contained 100% by mass of synthetic fibers. The synthetic fibers contained 80% by mass of rayon and 20% by mass of core-sheath composite fibers, and the core-sheath composite fiber had a core made of polypropylene resin and a sheath made of polyethylene resin. The fiber sheet B was produced according to a conventional method by the spunlace method.

[0057] [Comparative Example S1: Wet Wipe] In Example S1, a wet sheet was produced in the same manner as in Example S1, except that fiber sheet A, i.e., a fiber sheet mainly composed of natural cellulose fibers, was used instead of fiber sheet C. The fiber sheet A had a rectangular shape in plan view with a length of 285 cm and a width of 205 cm, had a single-layer structure, and had a basis weight of 80 g / m 2 It was. The fiber sheet A contained 95% by mass of the natural cellulose fibers (pulp fibers) and 5% by mass of CMC as a binder. The fiber sheet A was produced by preparing a dispersion containing fibers, a binder, and water, and forming the dispersion into a sheet according to a conventional method by the wet papermaking method.

[0058] The impregnation rate is calculated by the following formula. In the following formula, "W0" refers to the mass of the nonwoven fabric before impregnation (unit: g), and "W" refers to the mass of the nonwoven fabric immediately after impregnation (unit: g). Impregnation rate (mass%) = {(W0 - W) / W} × 100

[0059] 〔Evaluation Test 2〕 Regarding the wet sheets of each example and comparative example, researchers developing cleaning supplies evaluated the finish. The evaluation of the finish of this wet sheet was the same as the evaluation method, except that the "fiber sheet" was changed to the wet sheet to be evaluated in the <Evaluation Method of Finish>. In addition, the liquid appearance, sheet breakage prevention property, and touch of the liquid cleaning composition impregnated in the wet sheet were evaluated by the above method. The results are shown in Table 4 below.

[0060]

Table 4

[0061] As shown in Table 4, for the wet sheets of each example, since the liquid cleaning composition impregnated in the fiber sheet contained CMCS, all four evaluation items had excellent results.

Claims

1. A liquid detergent composition comprising carboxymethyl cellulose or a salt thereof, a water-soluble organic solvent, and water, wherein the water-soluble organic solvent is contained in an amount of 5% by mass or more and 50% by mass or less based on the total mass of the liquid detergent composition, the carboxymethyl cellulose or a salt thereof includes those having an etherification degree of 0.8 or more, and the liquid detergent composition has a viscosity at 25°C of 7 mPa·s or more and 1000 mPa·s or less.

2. The liquid detergent composition according to claim 1, further containing a surfactant in an amount of more than 0% by mass and 5% by mass or less based on the total mass of the liquid detergent composition.

3. The liquid detergent composition according to claim 2, further containing a water-insoluble oily substance.

4. The liquid detergent composition according to claim 2, further containing a fragrance component in an amount of 0.05% by mass or more and 3% by mass or less based on the total mass of the liquid detergent composition.

5. The liquid detergent composition according to claim 1 or 2, which is applied to a fiber sheet for wiping and cleaning a hard surface.

6. A container containing the liquid detergent composition according to claim 1 or 4.

7. A cleaning method, wherein the liquid detergent composition according to claim 1 or 2 is applied to a fiber sheet, and the fiber sheet is used to wipe and clean a hard surface.

8. A wet sheet in which the fiber sheet is impregnated with the liquid detergent composition according to claim 1 or 2.

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