Liquid cleaning agent composition for hard surfaces

Abstract

To provide a liquid cleaning agent composition for hard surfaces that provides superior rapid-acting cleaning performance against denatured oily stains and also provides superior cleaning performance for film oily stains.SOLUTION: A liquid cleaning agent composition for hard surfaces contains (a) 1 mass% or more and 10 mass% or less of a nonionic surfactant having one chain hydrocarbon group with a carbon number of 5 or more and 22 or less, (b) 8 mass% or more and 15 mass% or less of one or more water-soluble organic solvents having an alkyl group with a carbon number of 1 or more and 4 or less, a hydroxyalkyl group with a carbon number of 1 or more and 4 or less, a phenyl group, a benzyl group, or an alkyleneoxy group with a carbon number of 2 or more and 4 or less, provided that those corresponding to the component (a) are excluded, (c) 1 mass% or more and 10 mass% or less of monoethanolamine, and (d) an alkali metal hydroxide and water, wherein a proportion of the component (a) in all surfactants contained in the composition is 60 mass% or more and 100 mass% or less, and a pH at 25°C is 12.0 or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a liquid detergent composition for hard surfaces and a method for cleaning hard surfaces, particularly to a liquid detergent composition and a method for cleaning hard surfaces in kitchens and surrounding areas where food is prepared by food service businesses, food processors, etc. [Background technology]

[0002] In kitchens and surrounding areas, particularly in food service establishments, cooking appliances such as ranges, ovens, and fryers, as well as the surrounding walls, floors, and ventilation fans, as well as food processing equipment, are prone to developing oily stains due to heat, sunlight, oxygen in the air, etc. In particular, the kitchens and food processing equipment of food service establishments that cook large amounts of food every day are prone to accumulating stubborn oily stains. To remove these stains, various cleaning agents for kitchens and surrounding areas have been developed and are being used, including those that use strong alkalinity to break down stains, combinations of solvents that take into account the affinity for denatured stains, and combinations of these base materials with various surfactants.

[0003] Patent Document 1 discloses a liquid detergent composition for hard surfaces, which contains (a) 1 to 15 mass % of a monoalkyl ether of a specific polyalkylene glycol, (b) an amine oxide, (c) 0.01 to 15 mass % of a specific surfactant, and water, in which the mass ratio of component (c) / (component (b) + component (c)) is 0.01 / 1 to 1 / 1 and the pH at 25°C is 6 to 14. Patent Document 2 also discloses a liquid detergent composition containing (a) a specific compound having one type of alkyl group selected from a 2-ethylhexyl group, an isononyl group, and an isodecyl group, (b) a specific surfactant, (c) a hydrophobic organic solvent that is liquid at 20°C, and (d) water in specific proportions. Patent Document 3 discloses a cleaning composition for hard surfaces that contains specific amounts of (a) a specific glyceryl ether derivative, (b) a surfactant, (c) a builder, and (d) water. Patent Document 4 discloses a liquid detergent composition having a pH of 10 or higher (25°C), which contains (a) 0.01 to 10% by mass of an amine oxide, (b) 0.01 to 30% by mass of an alkaline agent, (c) a copper phthalocyanine blue dye, (d) an azo yellow dye, and water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-126884 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-31692 [Patent Document 3] Japanese Patent Application Publication No. 7-3289 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-266552 Summary of the Invention [Problem to be solved by the invention]

[0005] Due to the generation of oil-laden smoke and soot during cooking, and the diffusion of oil from heated fryers, oil stains in the kitchens of restaurants and food processing equipment at food processors accumulate on hard surfaces around cooking equipment, ceilings, floors, and ventilation fans, despite regular cleaning. These stains then deteriorate and solidify due to the effects of heat, sunlight, and oxygen in the air. Depending on the degree of deterioration, deteriorated oils can become difficult to clean, even with the same surfactant. Oil stains that have thermally denatured to a resinous state (film-like oil stains), such as those found around trivets and gas ranges, are particularly difficult to clean because they adhere firmly to hard surfaces. In recent years, the food and beverage industry has been experiencing a labor shortage, which has led to a demand for shorter cleaning times, and therefore a need for fast-acting cleaning capabilities. The present invention provides a liquid detergent composition for hard surfaces that not only has excellent rapid-acting cleaning performance for denatured oily stains but also has excellent cleaning power for film-like oily stains, and a method for cleaning hard surfaces. [Means for solving the problem]

[0006] The present invention relates to a liquid detergent composition for hard surfaces, which contains (a) 1% by mass to 10% by mass of a nonionic surfactant having one chain hydrocarbon group having from 5 to 22 carbon atoms, (b) 8% by mass to 15% by mass of one or more water-soluble organic solvents having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms (excluding those corresponding to component (a)), (c) 1% by mass to 10% by mass of monoethanolamine, and (d) an alkali metal hydroxide and water, wherein the proportion of component (a) in all surfactants contained in the composition is from 60% by mass to 100% by mass, and the composition has a pH of 12.0 or higher at 25°C.

[0007] The present invention also relates to a method for cleaning a hard surface, which comprises contacting the hard surface with a liquid detergent composition for hard surfaces, the liquid detergent composition comprising: (a) 1% by mass to 10% by mass of a nonionic surfactant having one chain hydrocarbon group having from 5 to 22 carbon atoms; (b) 8% by mass to 15% by mass of one or more water-soluble organic solvents having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms (excluding those corresponding to component (a)); (c) 1% by mass to 10% by mass of monoethanolamine; and (d) an alkali metal hydroxide and water, wherein the proportion of component (a) in the total surfactants contained in the composition is 60% by mass to 100% by mass and the composition has a pH of 12.0 or higher at 25°C. [Effects of the Invention]

[0008] According to the present invention, there are provided a liquid detergent composition for hard surfaces that not only has excellent rapid-acting cleaning performance against denatured oily stains but also has excellent cleaning power against film-like oily stains, and a method for cleaning hard surfaces. DETAILED DESCRIPTION OF THE INVENTION

[0009] The mechanism by which the liquid detergent composition for hard surfaces of the present invention not only has excellent rapid-acting cleaning performance against denatured oily stains but also exhibits excellent cleaning power against film-like oily stains is not clear, but is presumed to be as follows. The inventors analyzed the component composition of the modified oil and noticed that it contains oleic acid. They speculate that because nonionic surfactants are not affected by the negative charge of fatty acids such as oleic acid and do not electrostatically repel fatty acids, the nonionic surfactants can quickly adsorb to the oil interface, thereby exhibiting fast-acting detergency for modified oil. In particular, the inventors have found that, among the nonionic surfactants of component (a), the use of amine oxide surfactants provides high detergency. This is presumably because amine oxide surfactants retain their cationic properties under highly alkaline conditions, while their nonionic properties are strengthened. The liquid detergent composition for hard surfaces of the present invention is capable of converting the amine oxide surfactant into a cationic state due to the negative charge of oleic acid. Since the composition has a high pH, ​​it is presumed that the composition changes its properties to be more effective on lipophilic compositions than on water-soluble compositions, thereby further improving its fast-acting detergency for modified oils. Furthermore, since the liquid detergent composition for hard surfaces of the present invention is highly alkaline, the weak alkaline agent monoethanolamine, which is compact, acts as a solvent and also as an alkaline buffer against the acid derived from the modified oil, which is believed to result in the rapid detergency of the modified oil and excellent detergency against film-like oil-modified stains. The liquid detergent composition for hard surfaces and the method for cleaning hard surfaces of the present invention are not limited to the above-mentioned mechanism of action. In the present invention, the properties of modified oils vary depending on the degree of modification, and modified oils with an advanced degree of modification, such as those used to remove baked-on stains, are sometimes called film oils, while modified oils with a lower degree of modification are sometimes called sticky oils. Although film oils and sticky oils have different properties, the liquid detergent composition for hard surfaces of the present invention has excellent detergency for both modified oils.

[0010] <Liquid cleaning composition for hard surfaces> The liquid detergent composition for hard surfaces of the present invention contains (a) a nonionic surfactant having one chain hydrocarbon group having from 5 to 22 carbon atoms (hereinafter referred to as component (a)), (b) one or more water-soluble organic solvents having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms (excluding those corresponding to component (a)) (hereinafter referred to as component (b)), (c) monoethanolamine (hereinafter referred to as component (c)), (d) an alkali metal hydroxide (hereinafter referred to as component (d)), and water, wherein the proportion of component (a) in the total surfactants contained in the composition is from 60 to 100 mass%, and the composition has a pH of 12.0 or higher at 25°C.

[0011] <Component (a)> Component (a) is a nonionic surfactant having a chain hydrocarbon group having from 5 to 22 carbon atoms. Component (a) can be used alone or in combination of two or more. From the viewpoint of further enhancing fast-acting detergency, component (a) is a nonionic surfactant having a chain hydrocarbon group having from 5 to 22 carbon atoms, preferably from 8 to 10 carbon atoms, and from 22 to 18 carbon atoms, preferably from 16 to 16 carbon atoms. The chain hydrocarbon group is preferably an alkyl group or an alkenyl group, more preferably an alkyl group. In this specification, when the chain hydrocarbon group or alkyl group has a carbonyl carbon atom at its terminal, the carbonyl carbon atom is also counted as the carbon number of the chain hydrocarbon group or alkyl group.

[0012] From the viewpoint of further enhancing quick-acting detergency, it is preferable that the component (a) contains one or more surfactants selected from (a1) an amine oxide type surfactant (hereinafter referred to as component (a1)) and (a2) a polyoxyalkylene type surfactant (hereinafter referred to as component (a2)).

[0013] From the viewpoint of further enhancing fast-acting detergency against modified oils, it is preferable that component (a) contains component (a1). It is more preferable that component (a1) is the main nonionic surfactant of component (a). That is, from the viewpoint of further enhancing fast-acting detergency against modified oils, the proportion of component (a1) in component (a) is preferably 50% by mass or more, more preferably 70% by mass or more, even more preferably 90% by mass or more, and preferably 100% by mass or less, and the proportion of component (a1) in component (a) may be substantially 100% by mass.

[0014] Furthermore, from the viewpoint of further enhancing the fast-acting cleansing properties, it is more preferable that the component (a) contains one or more selected from the components (a1) and (a2), and further contains (a3) ​​a nonionic surfactant having a chain hydrocarbon group having from 5 to 22 carbon atoms, an average degree of polymerization of from 1 to 3, and having one or more selected from a (poly)glyceryl ether group and a (poly)glucoside group [hereinafter referred to as component (a3)].

[0015] In this specification, (poly) means that the number of repeating units such as glyceryl ether groups is one or more. For example, the number of glyceryl ether groups or glucoside groups in component (a3) ​​is one or more. More specifically, in component (a3), the (poly)glyceryl group means both a polyglyceryl ether group and a glyceryl ether group.

[0016] <Component (a1)> The component (a1) is an amine oxide surfactant having a chain hydrocarbon group having 5 to 22 carbon atoms. From the viewpoint of further enhancing fast-acting detergency, the number of carbon atoms in the chain hydrocarbon group of component (a1) is 5 or more, preferably 11 or more, and 22 or less, preferably 18 or less, more preferably 14 or less. From the viewpoint of further enhancing detergency, the hydrocarbon group of component (a1) is preferably an alkyl group or an alkenyl group, more preferably an alkyl group, even more preferably a straight-chain alkyl group, and even more preferably a lauryl group.

[0017] From the viewpoint of further enhancing fast-acting detergency, component (a1) is an amine oxide surfactant having one hydrocarbon group having from 5 to 22 carbon atoms which may be bonded to the nitrogen atom of the amine oxide via, for example, an amido alkylene group in which the alkylene group has from 1 to 5 carbon atoms, and having two alkyl groups having from 1 to 3 carbon atoms connected to the nitrogen atom. As described above, this hydrocarbon group is preferably a linear alkyl group, and the preferred number of carbon atoms in the hydrocarbon group is as described above.

[0018] The component (a1) is more preferably an amine oxide surfactant in which the chain hydrocarbon group is a lauryl group, and if it has an amido alkylene group, it is an amido propylene group, and a dimethyl group is preferred.

[0019] From the viewpoint of further enhancing quick-acting cleansing properties, the compound represented by the following general formula (a1) can also be shown as a suitable compound for the component (a1).

[0020] [ka]

[0021] [In the formula, R 1a is R 1a When a carbonyl carbon atom is bonded to the terminal of R, it is a hydrocarbon group having 4 to 21 carbon atoms. 1a If no carbonyl carbon atom is bonded to the end of R, it represents a hydrocarbon group having 5 to 22 carbon atoms. 2a and R 3aeach independently represents an alkyl group having 1 to 3 carbon atoms; D represents an -NHC(=O)- group or a -C(=O)NH- group; E represents an alkylene group having 1 to 5 carbon atoms; and p represents 0 or 1.

[0022] In the above general formula (a1), R 1a From the viewpoint of further improving the cleaning property, R is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group. When p is 1 and D is a -C(=O)NH- group, R 1a From the viewpoint of further improving the cleaning property, the number of carbon atoms in R is preferably 7 or more, more preferably 11 or more, and preferably 18 or less, more preferably 14 or less. When p is 0 or 1 and D is a -NHC(=O)- group, R 1a From the viewpoint of further improving the cleaning property, the number of carbon atoms is preferably 8 or more, more preferably 12 or more, and is preferably 18 or less, more preferably 14 or less. In the general formula (a1), D is preferably a —C(═O)NH— group, and E is preferably a propylene group. In the present invention, p is preferably 0 from the viewpoint of further improving the cleaning property. 1a is preferably a lauryl group, and R 2a , R 3a is preferably a methyl group having one carbon atom, from the viewpoint of further improving the cleaning property.

[0023] Preferred specific examples of component (a1) are: (1) Alkyl (carbon number 5 to 22) dialkyl (carbon number 1 to 3) amine oxides: capryl dimethylamine oxide, capric dimethylamine oxide, lauryl dimethylamine oxide, myristyl dimethylamine oxide, palmityl dimethylamine oxide, stearyl dimethylamine oxide, (2) Amide group-containing amine oxides (compounds in which p=1 in general formula (a1)): caprylic acid amidopropyl dimethylamine oxide, capric acid amidopropyl dimethylamine oxide, lauric acid amidopropyl dimethylamine oxide, myristic acid amidopropyl dimethylamine oxide These can be used alone or in combination of two or more.

[0024] From the viewpoint of further enhancing cleaning properties, the component (a1) is preferably (1) an alkyl (having 5 to 22 carbon atoms) dialkyl (having 1 to 3 carbon atoms) amine oxide, more preferably one or more selected from capryl dimethylamine oxide, lauryl dimethylamine oxide, and myristyl dimethylamine oxide, even more preferably one or more selected from lauryl dimethylamine oxide and myristyl dimethylamine oxide, and even more preferably a combination of lauryl dimethylamine oxide and myristyl dimethylamine oxide.

[0025] <(a2) component> The component (a2) is a polyoxyalkylene surfactant having a chain hydrocarbon group having 5 to 22 carbon atoms. From the viewpoint of further enhancing cleaning performance, the number of carbon atoms in the chain hydrocarbon group of component (a2) is 5 or more, preferably 11 or more, and 22 or less, preferably 18 or less, more preferably 14 or less. From the viewpoint of further enhancing cleaning power, the hydrocarbon group of component (a2) is preferably an alkyl group or an alkenyl group, and more preferably an alkyl group.

[0026] Component (a2) is preferably one or more polyoxyalkylene alkyl ethers having an alkyl group containing from 5 to 22 carbon atoms and having an average degree of polymerization of the alkyleneoxy group containing 2 or 3 carbon atoms of from 1 to 20. The preferred number of carbon atoms in the alkyl group is as described above for the number of carbon atoms in the chain hydrocarbon group. The alkyleneoxy group (sometimes referred to as an oxyalkylene group) is preferably an ethyleneoxy group (sometimes referred to as an oxyethylene group), which is an alkyleneoxy group containing 2 carbon atoms, and the average degree of polymerization is preferably 1 or more, more preferably 3 or more, even more preferably 6 or more, and preferably 20 or less, more preferably 15 or less, even more preferably 12 or less, and even more preferably 8 or less. When the alkyleneoxy group contains a propyleneoxy group containing 3 carbon atoms, the average degree of polymerization of the propyleneoxy group is preferably 5 or less, more preferably 3 or less. The alkyleneoxy group may contain both an ethyleneoxy group and a propyleneoxy group, and these may be block polymerized or randomly polymerized with each other. The component (a2) is preferably a polyoxyalkylene alkyl ether in which the linear alkyl group has 8 to 18 carbon atoms, the carbon atom of the alkyleneoxy group bonding to the alkyl group and the oxygen atom of the alkyleneoxy group is the first carbon atom or the second carbon atom, the number of polymerized ethyleneoxy groups is on average 3 to 12, and the number of polymerized propyleneoxy groups is on average 0 to 3.

[0027] From the viewpoint of further improving cleaning properties, the component (a2) is preferably a compound represented by the following general formula (a2). R 4a -O-(R 5a O) t -H (a2) [In the formula, R 4a is an alkyl group having 5 to 22 carbon atoms, and R 5a O is one or more selected from alkyleneoxy groups having 2 to 3 carbon atoms, and t is R 5a The average number of moles of O added is 1 or more and 20 or less.

[0028] In general formula (a2), R 4aFrom the viewpoint of further improving the cleaning property, R is an alkyl group having 5 or more carbon atoms, preferably 8 or more carbon atoms, and 22 or less carbon atoms, preferably 18 or less carbon atoms. 5a From the viewpoint of further improving the cleaning property, O is at least one selected from alkyleneoxy groups having from 2 to 3 carbon atoms, and an ethyleneoxy group or a propyleneoxy group is preferred. 5a When O contains a plurality of alkyleneoxy groups, the plurality of alkyleneoxy groups may be bonded in a block or random manner. From the viewpoint of further improving cleaning properties, t is a number of 1 or more, preferably 3 or more, more preferably 6 or more, and preferably 15 or less, more preferably 12 or less, and even more preferably 8 or less. In order to further enhance the cleaning properties, the compound represented by general formula (a2) is 5a Preferred are compounds in which O is an ethyleneoxy group and t is a number of 1 or more, preferably 3 or more, more preferably 6 or more, and preferably 15 or less, more preferably 12 or less, and even more preferably 8 or less.

[0029] <(a3) component> The component (a3) ​​is a nonionic surfactant having a chain hydrocarbon group having 5 to 22 carbon atoms, an average degree of polymerization of 1 to 3, and at least one selected from a (poly)glyceryl ether group and a (poly)glucoside group. Examples of component (a3) ​​include nonionic surfactants having a chain hydrocarbon group, preferably a branched alkyl group, having from 5 to 22 carbon atoms, preferably from 20 to 18 carbon atoms, more preferably from 15 to 10 carbon atoms, and having an average degree of polymerization of from 1 to 3, and having at least one selected from a (poly)glyceryl ether group and a (poly)glucoside group. The component (a3) ​​is preferably used in combination with one or more nonionic surfactants selected from the components (a1) and (a2).

[0030] <(b) Component> Component (b) is one or more water-soluble organic solvents (excluding those corresponding to component (a)) having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms. The molecular weight of component (b) is preferably 300 or less. In the water-soluble organic solvent of component (b), water solubility means that the solvent dissolves in water at 20°C at a temperature of 20 g / L or more.

[0031] Component (b) is preferably one or more (poly)glycol ether compounds selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol, each of which has an alkyl group, phenyl group, or benzyl group having from 1 to 4 carbon atoms and one to four alkyleneoxy groups having from 2 to 4 carbon atoms, preferably 2 or 3 carbon atoms. Specific examples of the (poly)glycol ether compound include one or more selected from (poly)alkylene glycol monoalkyl ethers, (poly)alkylene glycol monophenyl ethers, and (poly)alkylene glycol monobenzyl ethers.

[0032] From the viewpoint of appearance, component (b) is preferably a (poly)alkylene glycol monoalkyl ether having an alkyl group having from 1 to 4 carbon atoms and from 1 to 4 alkyleneoxy groups having 2 or 3 carbon atoms, and more preferably a compound represented by the following general formula (b1): R 1b -O-(R 2b O) t -H (b1) [In the formula, R 1b is an alkyl group having 1 to 4 carbon atoms, and R 2b O is a group selected from alkyleneoxy groups having 2 to 3 carbon atoms, and t is R 2b The number of moles of O added is 1 or more and 4 or less.

[0033] In general formula (b1), R 1bFrom the viewpoint of further enhancing foaming properties, R is preferably an alkyl group having 2 or more and 4 or less carbon atoms, and is preferably a butyl group. 2b O is preferably an ethyleneoxy group or a propyleneoxy group, and more preferably an ethyleneoxy group. From the viewpoint of appearance, t is a number of 1 or more, preferably 2 or more, and preferably 3 or less, and more preferably 2.

[0034] Examples of the compound represented by general formula (b1) include one or more selected from 1-methoxy-2-propanol, dipropylene glycol monomethyl ether, 2-ethoxyethanol, 2-(2-ethoxyethoxy)ethanol, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether (also called butyl carbitol), triethylene glycol monobutyl ether, 1-butoxy-2-propanol, dipropylene glycol mono-n-butyl ether, 2-isobutoxyethanol, and 2-(2-isobutoxyethoxy)ethanol. From the viewpoint of appearance, dipropylene glycol monomethyl ether, ethylene glycol One or more selected from dipropylene glycol monomethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, 1-butoxy-2-propanol, dipropylene glycol mono-n-butyl ether, 2-isobutoxyethanol, and 2-(2-isobutoxyethoxy)ethanol are preferred, and one or more selected from dipropylene glycol monomethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, dipropylene glycol mono-n-butyl ether, and 2-(2-isobutoxyethoxy)ethanol are more preferred.

[0035] <(c) component> Component (c) is monoethanolamine. Since the acid dissociation constant pKa of monoethanolamine is 9.55, in the liquid detergent composition for hard surfaces of the present invention having a pH of 12.0 or higher, component (c) is expected to have effective penetration properties in terms of fast-acting detergency of denatured oils and cleaning of film-like oil stains, together with component (b), due to the properties of an organic solvent rather than an alkaline agent, and also due to its compact structure.

[0036] <(d) component> Component (d) is an alkali metal hydroxide. Component (d) can further enhance the cleaning properties of film oil stains. Component (d) can be used alone or in combination of two or more. Component (d) is preferably one or more selected from sodium hydroxide and potassium hydroxide, more preferably sodium hydroxide.

[0037] <Water> The liquid detergent composition for hard surfaces of the present invention contains water, which may be, for example, deionized water, distilled water, RO water, ultrapure water, or tap water.

[0038] <Composition, optional ingredients, etc.> In order to further enhance fast-acting detergency against modified oils, the liquid detergent composition for hard surfaces of the present invention contains component (a) in an amount of 1% by mass or more, preferably 1.5% by mass or more, more preferably 2% by mass or more, and 10% by mass or less, preferably 8% by mass or less, more preferably 6% by mass or less.

[0039] In the liquid detergent composition for hard surfaces of the present invention, the proportion of component (a) in the total surfactants contained in the composition is 60% by mass or more, preferably 80% by mass or more, more preferably 90% by mass or more, and 100% by mass or less, preferably 98% by mass or less, from the viewpoint of further enhancing fast-acting detergency against modified oils. The total surfactant content may be the total content of component (a) and the following component (e) in the composition.

[0040] The liquid detergent composition for hard surfaces of the present invention contains component (b) in an amount of 8% by mass or more, preferably 9% by mass or more, more preferably 10% by mass or more, in order to further enhance film oil cleansing properties, and 15% by mass or less, preferably 14% by mass or less, more preferably 13% by mass or less, in order to further enhance fast-acting modified oil cleansing properties.

[0041] The liquid detergent composition for hard surfaces of the present invention contains component (c) in an amount of 1% by mass or more, preferably 1.5% by mass or more, more preferably 2% by mass or more, in order to further enhance the cleaning properties of the film oil when diluted, and 10% by mass or less, preferably 8% by mass or less, more preferably 6% by mass or less, in order to further enhance the rapid cleaning properties.

[0042] The liquid detergent composition for hard surfaces of the present invention contains component (d) in an amount of preferably 2% by mass or more, more preferably 3% by mass or more, and even more preferably 4% by mass or more in terms of pH adjustment, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less in terms of further reducing substrate damage. In the liquid detergent composition for hard surfaces of the present invention, the acid contained therein is consumed as an alkali metal salt, and the content of the alkali metal hydroxide, which is component (d), in the liquid detergent composition for hard surfaces of the present invention is determined from the concentration of the remaining free alkali metal ions. Therefore, the alkali metal that is counted as an acid salt is not included in the content of component (d).

[0043] In the liquid detergent composition for hard surfaces of the present invention, the mass ratio of the content of component (a) to the content of component (b) [(a) / (b)] is preferably 0.1 or more, more preferably 0.15 or more, even more preferably 0.2 or more, from the viewpoint of further enhancing detergency, and is preferably 5.0 or less, more preferably 3.0 or less, even more preferably 2.0 or less, and even more preferably 1.0 or less.

[0044] <(e) component> The liquid detergent composition for hard surfaces of the present invention may optionally contain a surfactant other than the surfactant corresponding to component (e)(a) (hereinafter referred to as component (e)). The liquid detergent composition for hard surfaces of the present invention may contain component (e) to the extent that the effect of the present invention is not impaired. The component (e) is at least one selected from (e1) nonionic surfactants excluding those corresponding to the component (a), (e2) anionic surfactants, (e3) cationic surfactants, and (e4) amphoteric surfactants.

[0045] The component (e1) is, for example, HO(EO) in which ethylene oxide (EO) and propylene oxide (PO) are block polymerized. a (PO) b (EO) c It is an EOPOEO triblock polymer nonionic surfactant represented by the formula H (where a, b, and c are the average degrees of polymerization of the alkyleneoxy groups and are each independently 2 to 20). It is also called a poloxamer and is known under product names such as Pluronic.

[0046] The anionic surfactant of component (e2) is, for example, one or more anionic surfactants selected from alkylbenzenesulfonates, alkyl or alkenyl sulfate ester salts, olefinsulfonates, alkanesulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylate salts, N-acylamino acids, mono- or di-phosphate esters, and sulfosuccinate esters. The alkyl or alkenyl group of these anionic surfactants has, for example, 8 to 22 carbon atoms. Counterions of the anionic groups of these anionic surfactants include alkali metal ions such as sodium ions and potassium ions, alkaline earth metal ions such as calcium ions and magnesium ions, ammonium ions, and alkanolamines having one to three alkanol groups each having two or three carbon atoms (e.g., monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.). However, when component (e2) is a salt of monoethanolamine, the monoethanolamine constituting component (e2) is counted as component (c).

[0047] The anionic surfactant of component (e2) is preferably one or more anionic surfactants selected from alkylbenzenesulfonic acid, alkyl or alkenyl sulfate esters, and salts thereof, and more preferably alkylbenzenesulfonic acid or a salt thereof. The number of carbon atoms in the alkyl group of the alkylbenzenesulfonic acid is preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 14 or less, and the alkyl group is preferably linear. The number of carbon atoms in the alkyl or alkenyl group of the alkyl or alkenyl sulfate ester is preferably 10 or more, more preferably 12 or more, and preferably 18 or less, more preferably 14 or less.

[0048] Examples of the cationic surfactant (e3) include primary amines, secondary amines, tertiary amines, quaternary ammonium salts, and salts thereof. The alkyl or alkenyl group of these cationic surfactants has, for example, 8 to 25 carbon atoms. Among these, component (e3) is preferably a quaternary ammonium salt. Examples of quaternary ammonium salts include compounds in which at least one of the four substituents is an alkyl or alkenyl group having a total of 8 to 25 carbon atoms, and the remainder is a group selected from a benzyl group, an alkyl group having 1 to 5, preferably 3, carbon atoms, and a hydroxyalkyl group having 1 to 5, preferably 3, carbon atoms. The alkyl or alkenyl group having a total of 8 to 25 carbon atoms may be interrupted by an alkoxy group, alkenyloxy group, alkanoylamino group, alkenoylamino group, alkanoyloxy group, or alkenoyloxy group within the range of 8 to 25 carbon atoms. In such cases, the number of carbon atoms from the bonding group to the nitrogen atom is preferably 2 to 4. As for salts of component (a3), amine compounds form salts with acids such as hydrochloric acid, but the composition is alkaline and therefore likely contains almost no salts. In the case of quaternary ammonium compounds, examples include halides and alkyl sulfates having 1 to 3 carbon atoms. Examples of halides include chlorides, bromides, and iodides, and examples of alkyl sulfates having 1 to 3 carbon atoms include methyl sulfate, ethyl sulfate, and propyl sulfate.

[0049] Examples of amphoteric surfactants of component (e4) include N-alkanoylaminopropyl-N,N-dimethyl-N-carboxymethylammonium betaine, N-alkyl-N,N-dimethyl-N-carboxymethylammonium betaine, 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, and N-alkanoylaminopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine. In these, the alkyl group is, for example, a lauryl group or a myristyl group. In addition, in these, the alkanoyl group is, for example, lauroyl or myristyl.

[0050] When the liquid detergent composition for hard surfaces of the present invention contains component (e), the composition contains component (e) in an amount of preferably more than 0 mass % and preferably not more than 2 mass %, more preferably not more than 1 mass %, and even more preferably not more than 0.05 mass %, in order to further enhance the detergency against modified oils. Furthermore, the proportion of component (e) in all surfactants contained in the liquid detergent composition for hard surfaces of the present invention is preferably 40% by mass or less, more preferably 20% by mass or less, even more preferably 10% by mass or less, and even more preferably 2% by mass or less.

[0051] <Component (f)> The liquid detergent composition for hard surfaces of the present invention may optionally contain an alkaline agent other than those falling under components (f)(c) and (d) (hereinafter referred to as component (f)). Examples of the alkaline agent (f) include inorganic alkaline agents (excluding those that fall under component (d)) and organic alkaline agents (excluding those that fall under component (c)). Examples of the inorganic alkaline agent (f) include alkali metal carbonates and alkali metal silicates. From the viewpoint of further enhancing the film oil cleansing properties when diluted, component (f) is preferably an alkanolamine (excluding those corresponding to component (c)). The alkanolamine of the component (f) is, for example, one or more compounds selected from triethanolamine, N-methylmonopropanolamine, N-methylmonoethanolamine, N-methyldiethanolamine, and N,N-dimethylmonoethanolamine.

[0052] When the liquid detergent composition for hard surfaces of the present invention contains component (f), the liquid detergent composition for hard surfaces of the present invention contains component (f) in an amount of preferably 0.05% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and preferably 10% by mass or less, more preferably 5% by mass or less, even more preferably 1% by mass or less.

[0053] The liquid detergent composition for hard surfaces of the present invention contains water. Water can be used as the remainder of the composition in an amount such that the total composition amount is 100% by mass. In order to further enhance solubility, the liquid detergent composition for hard surfaces of the present invention contains water in an amount of preferably 50% by mass or more, more preferably 60% by mass or more, and preferably 90% by mass or less, more preferably less than 90% by mass, and even more preferably 80% by mass or less.

[0054] The liquid detergent composition for hard surfaces of the present invention may optionally contain components such as hydrotropes, such as aromatic sulfonic acids such as paratoluenesulfonic acid and metaxylenesulfonic acid, and alkali metal salts thereof, antigelling agents such as polyethylene glycol, thickeners, such as polyacrylic acid or alkali metal salts thereof, fragrances, dyes, pigments, disinfectants, preservatives, and pH adjusters (excluding those corresponding to components (a) to (f)). From the viewpoint of stability, the liquid detergent composition for hard surfaces of the present invention preferably contains no more than 1% by mass of a hydrophobic organic solvent such as a terpene hydrocarbon or paraffin, more preferably no more than 0.5% by mass, and even more preferably contains no hydrophobic organic solvent except for fragrances. The hydrophobic organic solvent of the present invention has a solubility of no more than 5 g / L in water at 20°C.

[0055] From the viewpoint of further enhancing cleaning performance, the pH of the liquid detergent composition for hard surfaces of the present invention at 25°C is 12.0 or more, preferably 12.5 or more, more preferably 13 or more, and for example, 14 or less. This pH is measured according to the pH measurement method described below.

[0056] When the liquid detergent composition for hard surfaces of the present invention is highly alkaline, it is difficult to measure the pH at a value exceeding 14. To confirm that the liquid detergent composition for hard surfaces of the present invention is highly alkaline, the pH of a 1% by mass aqueous solution of the liquid detergent composition for hard surfaces of the present invention diluted with deionized water at 25°C is preferably 12 or higher, and preferably 14 or lower. Therefore, from the viewpoint of further enhancing detergency, the pH at 25°C of an aqueous solution containing 1% by mass of the liquid detergent composition for hard surfaces of the present invention (i.e., an aqueous solution obtained by diluting the liquid detergent composition for hard surfaces 100-fold with water) is preferably 12 or higher, more preferably 12.5 or higher, still more preferably 13 or higher, and preferably 14 or lower. The aqueous solution may be an aqueous solution obtained by diluting the liquid detergent composition for hard surfaces of the present invention with deionized water. This pH is also measured according to the following pH measurement method.

[0057] <pH Measurement Method> Connect a combined electrode for pH measurement (glass sliding sleeve type, manufactured by Horiba, Ltd.) to a pH meter (pH / Ion meter F-23, manufactured by Horiba, Ltd.), and turn on the power. For the internal solution of the pH electrode, a saturated potassium chloride aqueous solution (3.33 mol / L) is used. Next, fill 100 mL beakers with a pH 4.01 standard solution (phthalate standard solution), a pH 6.86 (neutral phosphate standard solution), and a pH 9.18 standard solution (borate standard solution), respectively, and immerse them in a thermostat at 25°C for 30 minutes. Immerse the pH measurement electrode in the temperature-adjusted standard solution for 3 minutes, and perform calibration operations in the order of pH 6.86 → pH 9.18 → pH 4.01. Adjust the sample to be measured to 25°C, immerse the electrode of the above pH meter in the sample, and measure the pH after 1 minute.

[0058] From the viewpoint of further enhancing spray dischargeability, the viscosity at 25°C of the liquid detergent composition for hard surfaces of the present invention is preferably 50 mPa·s or lower, more preferably 30 mPa·s or lower, still more preferably 20 mPa·s or lower, and even more preferably 15 mPa·s or lower. This viscosity is the indicated value 1 minute after the start of measurement at 60 r / min using a B-type viscometer and using the rotor recommended for the viscosity to be measured among Rotors No. 1 to No. 3. The liquid detergent composition for hard surfaces is temperature-adjusted to 25 ± 1°C for measurement. If there are multiple rotors that satisfy the conditions, the value obtained when using the rotor with the smaller number is adopted. )

[0059] The liquid detergent composition for hard surfaces of the present invention may be a liquid detergent composition for hard surfaces of hard articles. The hard articles are preferably tableware and / or hard articles for use in the kitchen. Specific examples of hard surfaces to be cleaned with the liquid detergent composition for hard surfaces of the present invention include the surfaces of the following hard articles. Hard items around the kitchen are items used around the kitchen, specifically: (1) Storage areas for food, tableware, and cooking utensils, such as refrigerators and cupboards, (2) Food preparation areas such as fryers, trivets, ovens, extractor fans, drains, countertops, range hoods, sinks, gas ranges, and microwave ovens; (3) Floors and walls around the storage area and cooking area In the present invention, these are referred to as "hard kitchen items" for convenience. In addition, the tableware, specifically, (i) Plates, bowls, and other tableware; (ii) Storage containers such as Tupperware and bottles, (iii) Cooking utensils such as knives, cutting boards, pots, frying pans, and fish grills; (iv) Food processors, mixers, and other cooking appliances In the present invention, these are referred to as "tableware" for convenience. Furthermore, the liquid detergent composition for hard surfaces of the present invention is preferably intended for use on items selected from cooking areas, tableware, storage containers, cooking utensils, and kitchen appliances, and more preferably for use on items selected from fryers, trivets, gas ranges, ovens, extractor fans, plates, bowls, Tupperware, bottles, knives, cutting boards, pots, frying pans, fish grills, food processors, and mixers.

[0060] The liquid detergent composition for hard surfaces of the present invention can be used to effectively clean tableware and / or kitchen hard objects made of plastics (including silicone resins, etc.), metals, ceramics, wood, and combinations thereof. The liquid detergent composition for hard surfaces of the present invention can effectively clean oily stains containing denatured oils, particularly heat-denatured oils, adhering to the tableware and / or kitchen hard objects.

[0061] <How to clean hard surfaces> The present invention provides a method for cleaning a hard surface, comprising contacting the hard surface with a liquid detergent composition for hard surfaces, the composition comprising: (a) 1 to 10 mass% of a nonionic surfactant having one chain hydrocarbon group having from 5 to 22 carbon atoms; (b) 8 to 15 mass% of one or more water-soluble organic solvents having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms (excluding those corresponding to component (a)); (c) 1 to 10 mass% of monoethanolamine; and (d) an alkali metal hydroxide and water, wherein the proportion of component (a) in the total surfactant content of the composition is from 60 to 100 mass% and the composition has a pH of 12.0 or higher at 25°C. The method for cleaning a hard surface of the present invention may be a method for cleaning a hard surface in which the liquid detergent composition for hard surfaces of the present invention is brought into contact with the hard surface.

[0062] In the method for cleaning a hard surface of the present invention, the hard surface may be the surface of a hard article. Specifically, it may be the surface of a hard article described above in connection with the liquid detergent composition for hard surfaces of the present invention. In the method for cleaning hard surfaces of the present invention, preferred aspects of the liquid detergent composition for hard surfaces of the present invention, such as the components (a) to (d), water, and optional components contained in the liquid detergent composition for hard surfaces of the present invention, as well as the contents and pH of these components, are the same as those described for the liquid detergent composition for hard surfaces of the present invention.

[0063] When the liquid detergent composition for hard surfaces of the present invention (also referred to as undiluted solution) is brought into contact with oily stains containing denatured oil, particularly heat-denatured oil, the denatured oil is broken down into small pieces and floats off the object (e.g., tableware and / or hard items around the kitchen). Methods for bringing the liquid detergent composition for hard surfaces of the present invention into contact with the object include, for example, applying or spraying the composition in a foam state. Therefore, in the cleaning method of the present invention, denatured oil stains can be easily removed without applying external force such as scrubbing, for example, by leaving the object for a certain period of time and then rinsing it with water. However, in the cleaning method of the present invention, the object surface may be cleaned by applying external force such as scrubbing.

[0064] In the cleaning method of the present invention, the liquid detergent composition for hard surfaces can be brought into contact with the surface of a hard article having oily soiling containing denatured oil, particularly heat-denatured oil, without dilution, and then rinsed without scrubbing. In the cleaning method of the present invention, the liquid detergent composition for hard surfaces can be brought into contact with the surface of a hard article having oily stains containing, for example, denatured oil, particularly heat-denatured oil, without being diluted, and can be cleaned without applying external force such as mechanical force. Cleaning the surface of a hard article without applying an external force such as a mechanical force means, for example, that no operation is performed to intentionally apply an external force for cleaning to the object other than contacting the composition. For example, the natural flow of the contacted composition down the surface of the hard article, or the transmission of vibrations not intended for cleaning to the hard article, can be understood as cleaning the surface of a hard article without applying an external force such as a mechanical force. "Bringing the liquid detergent composition for hard surfaces into contact without dilution with the surface of a hard article having oily soiling containing denatured oil, particularly heat-denatured oil," means that the detergent composition is not brought into contact with a hard article having oily soiling containing liquid oil derived from food after intentionally diluting it with water, etc. For example, when the liquid detergent composition for hard surfaces is brought into contact with a hard article having water droplets or the like attached thereto, or when water droplets adhere to the hard article after the liquid detergent composition for hard surfaces has been brought into contact with the hard article, this can be understood as meaning that the liquid detergent composition for hard surfaces has been brought into contact without dilution with a hard article having oily soiling containing denatured oil, particularly heat-denatured oil, attached thereto. After leaving the hard article, the hard article is rinsed with water. When rinsing, external force (physical force) may be applied by hand or the like, or simply rinsed with running water.

[0065] In the cleaning method of the present invention, the liquid detergent composition for hard surfaces is brought into contact with a hard article having oily soiling containing a modified oil, particularly a thermally modified oil, and then the hard article is left to stand and rinsed with water. When rinsing with water after contact, external force such as mechanical force may or may not be applied using a flexible material such as a sponge or fingers.

[0066] In the cleaning method of the present invention, the liquid detergent composition for hard surfaces of the present invention may be diluted with water and used in the cleaning method. In the cleaning method of the present invention, when the liquid detergent composition for hard surfaces is diluted with water, the dilution ratio is preferably more than 1, more preferably 2 or more, even more preferably 4 or more, even more preferably 10 or more, and preferably 100 or less, more preferably 80 or less, even more preferably 20 or less.

[0067] In the cleaning method of the present invention, from the viewpoint of further enhancing cleaning performance, the liquid detergent composition for hard surfaces is allowed to stand after contact with the hard article for preferably 10 seconds or more, more preferably 20 seconds or more, even more preferably 30 seconds or more, still more preferably 40 seconds or more, still more preferably 50 seconds or more, still more preferably 1 minute or more, and from the viewpoint of further reducing the cleaning burden on the user, it is preferably allowed to stand for preferably 60 minutes or less, more preferably 30 minutes or less, even more preferably 20 minutes or less, still more preferably 10 minutes or less, still more preferably 5 minutes or less. In this case, the time when the composition first comes into contact with the hard article may be considered to be the start of the standing period. The temperature at which it is left standing is room temperature, for example, 10°C or higher and 30°C or lower. [Example]

[0068] Liquid detergent compositions for hard surfaces shown in Table 1 were prepared using the following components (a) to (e), and the following items were evaluated. The results are shown in Table 1. The pH (25°C) of the liquid detergent compositions for hard surfaces shown in Table 1 was adjusted to the value shown in Table 1 using components (c) and (d). The mass % of each component in Table 1 is all based on the pure content.

[0069] <Component (a)> Nonionic surfactant: Amphitol 20N, lauryl dimethylamine oxide, manufactured by Kao Corporation; in the general formula (a1), R 1a is a lauryl group, R 2a , R 3a is a methyl group, and p=0 Non-ionic surfactant: Emulgen 103, polyoxyethylene (3) lauryl ether, manufactured by Kao Corporation Non-ionic surfactant: Emulgen 108, polyoxyethylene (6) lauryl ether, manufactured by Kao Corporation The number in parentheses for the polyoxyethylene lauryl ether above is the average number of moles of ethyleneoxy groups added.

[0070] <(b) Component> BDG-NS: Butyl carbitol (diethylene glycol monobutyl ether), manufactured by Nippon Nyukazai Co., Ltd. DPNB: Dipropylene glycol mono-(n-butyl) ether, manufactured by The Dow Chemical Company <(c) component> Monoethanolamine: Nippon Shokubai Co., Ltd. <(d) component> Alkali metal hydroxide: sodium hydroxide, manufactured by Nankai Chemical Co., Ltd. <(e) component> Anionic surfactant: Emeral 2F-HP, sodium lauryl sulfate, manufactured by Kao Corporation Anionic surfactant: Neopelex G-25, sodium alkyl (C10-14) benzenesulfonate, manufactured by Kao Corporation Cationic surfactant: Kotamin 20W, lauryltrimethylammonium chloride, manufactured by Kao Corporation <Water> Deionized water

[0071] (1) Fast-acting degreasing effect on denatured oils (2 min) The fast-acting modified oil cleaning ability of each hard surface liquid detergent composition in Table 1 was evaluated by the following method. This evaluation was conducted to evaluate the fast-acting modified oil cleaning ability for sticky oil stains with a low degree of modification that adhere to fryers, etc. (i) Pretreatment of SUS plate A SUS304 test piece (1.0 × 25 × 70 mm) manufactured by Engineering Test Services Co., Ltd. was washed with a sponge using neutral dishwashing detergent, then rinsed (once with tap water and twice with deionized water) and dried in an electric dryer at 80°C. (ii) Preparation of modified oil First, rapeseed oil (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was placed in a petri dish and heated in an oven at 180°C for 24 hours to prepare a thermally denatured oil. Next, the prepared thermally denatured oil and chloroform were mixed in a ratio of 20 g of thermally denatured oil to 60 mL of chloroform to prepare a chloroform solution containing the thermally denatured oil. (iii) Evaluation of fast-acting detergency for modified oils A chloroform solution containing modified oil was applied at 1 mg / cm2 to an area of ​​25 x 50 mm on one side of a SUS plate. 2 The oil was poured once using a dropper so that the surface was covered with oil. The surface was left to dry flat overnight with the oily side facing up. Next, three SUS plates were placed on a balance dish BD-3 (140 × 140 × 25 mm), and the Biore u Foam Pump Former was used to foam the hard surface liquid detergent composition (undiluted) shown in Table 1 onto the SUS plates so that the dirt adhering to the plates was covered. The plates were then left to stand for two minutes. The plates were then rinsed with tap water for one minute at 300 rpm using a Lenauts tester, and then left to dry flat overnight. The mass of the SUS plate before the chloroform solution containing the modified oil was attached (initial mass), the mass of the SUS plate before cleaning (mass before cleaning), and the mass of the SUS plate after cleaning (mass after cleaning) were each weighed using a four-digit balance, and the cleaning rate (mass%) was calculated using the following formula (1). The evaluation of fast-acting modified oil cleaning ability was carried out using three SUS plates for each type of liquid detergent composition for hard surfaces, and the average cleaning rate of the three plates was calculated. The evaluation was carried out based on the calculated average cleaning rate according to the following evaluation criteria. The results are shown in Table 1. The higher the cleaning rate, the better the fast-acting modified oil cleaning ability of the detergent composition. A cleaning ability rating of "A" or "B" indicates high fast-acting modified oil cleaning ability, which is preferable. Cleaning rate (mass%) = [(mass before cleaning) - (mass after cleaning)] / [(mass before cleaning) - (initial mass)]] × 100 (1) <Evaluation criteria> A: The cleaning rate was 90% or more by mass, and the dirt was completely removed. B: The cleaning rate was 60% by mass or more and 89% by mass or less, and the dirt was removed. C: The cleaning rate was 41% by mass or more and 59% by mass or less, and the stain remained. D: The cleaning rate was 40% by mass or less, and most of the dirt remained.

[0072] (2) Cleaning ability against film oil stains The cleaning ability of each hard surface liquid detergent composition in Table 1 against film oil (baked-on oil) stains was evaluated by the following method. This evaluation was conducted to evaluate the cleaning ability against highly denatured oil stains that adhere to trivets, gas ranges, etc. (i) Pretreatment of SUS plate The surface of a SUS304 test piece (1.0 x 25 x 70 mm) manufactured by Engineering Test Service Co., Ltd. was polished with sandpaper #240, washed with a neutral dishwashing detergent, rinsed with deionized water, and dried. (ii) Preparation of modified oil Rapeseed oil (manufactured by Yamakei Sangyo Co., Ltd.) was applied to the surface of the SUS plate at a concentration of 1 mg / cm using a brush. 2 The oil was then baked in an oven set at 200°C for 2 hours to bake the film of oil onto the SUS plate. (iii) Evaluation of cleaning performance A 0.1 mL drop of each liquid detergent composition for hard surfaces listed in Table 1 was added to an oil film baked onto a SUS plate and allowed to stand for 2 minutes. The SUS plate was placed 7 cm from the faucet, and 20°C tap water was poured onto the drop of the liquid detergent composition for hard surfaces listed in Table 1 at a flow rate of 4 L / min for 10 seconds to rinse. After rinsing, the SUS plate was allowed to air dry, and the degree of soil removal was visually observed. The cleaning ability against oil film stains was evaluated according to the following evaluation criteria. Compositions rated "A," i.e., compositions that removed soiling by rinsing with water, were compositions with excellent cleaning power against oil film stains in their undiluted form. In particular, these compositions were excellent in cleaning oil film stains even after a short treatment period. Incidentally, cases in which the soiling was removed by wiping the SUS surface with Kimwipes® after rinsing were also rated "D." <Evaluation criteria> A: The film dirt came off by rinsing with water. D: The stains didn't come off.

[0073] [Table 1]

Claims

1. (a) 1% by mass or more and 10% by mass or less of a nonionic surfactant having one chain hydrocarbon group having 5 to 22 carbon atoms; (b) 8% by mass or more and 15% by mass or less of one or more water-soluble organic solvents having an alkyl group having 1 to 4 carbon atoms, a hydroxyalkyl group having 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having 2 to 4 carbon atoms (excluding those corresponding to component (a)), (c) monoethanolamine in an amount of 1% by mass or more and 10% by mass or less; (d) containing an alkali metal hydroxide and water; A liquid cleaning composition for hard surfaces, wherein the proportion of the component (a) in all surfactants contained in the composition is 60% by mass or more and 100% by mass or less, and the pH at 25°C is 12.0 or more.

2. 2. The liquid cleaning composition for hard surfaces according to claim 1, wherein the component (a) contains at least one selected from (a1) an amine oxide surfactant and (a2) a polyoxyalkylene surfactant.

3. The liquid cleaning composition for hard surfaces according to claim 2, wherein the component (a) contains the component (a1).

4. 4. The liquid detergent composition for hard surfaces according to claim 3, wherein the proportion of the component (a1) in the component (a) is 50% by mass or more and 100% by mass or less.

5. A method for cleaning a hard surface, comprising contacting the hard surface with a liquid detergent composition for hard surfaces, the liquid detergent composition comprising: (a) 1% by mass to 10% by mass of a nonionic surfactant having one chain hydrocarbon group having from 5 to 22 carbon atoms; (b) 8% by mass to 15% by mass of one or more water-soluble organic solvents having an alkyl group having from 1 to 4 carbon atoms, a hydroxyalkyl group having from 1 to 4 carbon atoms, a phenyl group, a benzyl group, or an alkyleneoxy group having from 2 to 4 carbon atoms (excluding those corresponding to component (a)); (c) 1% by mass to 10% by mass of monoethanolamine; and (d) an alkali metal hydroxide and water, wherein the proportion of component (a) in all surfactants contained in the composition is 60% by mass to 100% by mass, and the composition has a pH of 12.0 or higher at 25°C.

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