Liquid cleaning agent composition for hard surfaces

Abstract

To provide a liquid cleaning agent composition for hard surfaces that achieves excellent storage stability, provides superior cleaning performance against denatured oily stains, especially cleaning performance at the time of dilution, and provides superior cleaning performance for oil that has formed a film.SOLUTION: A liquid cleaning agent composition for hard surfaces contains (a) 1 mass% or more and 10 mass% or less of a surfactant having a chain hydrocarbon group with a carbon number of 12 or more and 22 or less, (b) 0.01 mass% or more and 5 mass% or less of a short-chain nonionic surfactant having one alkyl group with a carbon number of 5 or more and 10 or less, (c) 5 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, and (d) an alkali metal hydroxide and water, wherein 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, and 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, cleaning agents for kitchens and surrounding areas have been developed and are being used, which 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. Furthermore, Patent Document 3 discloses a cleaning composition for hard surfaces that contains (a) a specific glyceryl ether derivative, (b) a surfactant, (c) a builder, and (d) water in specific amounts. [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 Summary of the Invention [Problem to be solved by the invention]

[0005] Oily smoke and soot are generated when cooking ingredients, and the oil generated by heated fryers spreads. As a result of repeated cooking or long cooking times, oil stains in the kitchens of restaurants and food processing equipment at food processors adhere to hard surfaces around the kitchen, such as ceilings, floors, and ventilation fans, not to mention the area around cooking equipment, despite regular cleaning. These stains deteriorate and become solidified due to the effects of heat, sunlight, oxygen in the air, etc. Depending on the degree of deterioration, deteriorated oil can be difficult to clean, even with the same surfactant. The present invention provides a liquid detergent composition for hard surfaces that has excellent storage stability, excellent cleaning properties for denatured oily soiling, particularly when diluted, and excellent cleaning properties for film-formed oils, and a method for cleaning hard surfaces. [Means for solving the problem]

[0006] The present invention relates to a surfactant composition containing (a) 1% by mass or more and 10% by mass or less of a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms, (b) 0.01% by mass or more and 5% by mass or less of a short-chain nonionic surfactant having one alkyl group having 5 to 10 carbon atoms (excluding those corresponding to component (a)), (c) 5% 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 components (a) and (b)], (d) containing an alkali metal hydroxide and water; The present invention relates to a liquid cleaning composition for hard surfaces, which 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 a hard surface with a liquid detergent composition for hard surfaces, the composition comprising: (a) 1% by mass to 10% by mass of a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms; (b) 0.01% by mass to 5% by mass of a short-chain nonionic surfactant having one alkyl group having from 5 to 10 carbon atoms (excluding those corresponding to component (a)); (c) 5% 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) and component (b)); and (d) an alkali metal hydroxide and water, the composition having 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 has excellent storage stability, excellent cleaning properties for denatured oil stains, particularly excellent cleaning properties when diluted, and excellent cleaning properties for film-formed oil, 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 has excellent cleaning properties for denatured oily stains, particularly when diluted, is not clear, but is presumed to be as follows. It is presumed that the interface between the denatured oily soil and the strongly alkaline detergent composition thickens, making it difficult to remove the denatured oily soil with a small amount of surfactant. In the liquid cleaning composition for hard surfaces of the present invention, it is presumed that the viscosity of the interface is reduced by the short-chain nonionic surfactant of component (b), thereby improving the cleaning properties of the surfactant of component (a). In addition, it is presumed that the storage stability of the liquid detergent composition for hard surfaces is improved by including the water-soluble organic solvent (c) in a specific amount. In this specification, the storage stability of the liquid detergent composition for hard surfaces may mean that the composition can be maintained in a clear state for a long period of time. 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 surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms [hereinafter referred to as component (a)], (b) a short-chain nonionic surfactant having one alkyl group having from 5 to 10 carbon atoms [excluding those corresponding to component (a)] [hereinafter referred to as component (b)], (c) 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) and component (b)] [hereinafter referred to as component (c)], (d) an alkali metal hydroxide [hereinafter referred to as component (d)], and water, and has a pH of 12.0 or higher at 25°C. In this specification, when a carbonyl carbon atom is bonded to the terminal of the chain hydrocarbon group or alkyl group, the carbonyl carbon atom is also included in the number of carbon atoms of the chain hydrocarbon group or alkyl group.

[0011] <Component (a)> Component (a) is a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms. Component (a) can be used alone or in combination of two or more. From the viewpoint of further improving cleaning properties, component (a) can be a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms, preferably from 18 to 14 carbon atoms. Examples of the chain hydrocarbon group include alkyl and alkenyl groups, with alkyl groups being preferred. The chain hydrocarbon group of component (a) is more preferably a linear alkyl group having a carbon number within the above range, with lauryl or lauroyl groups being even more preferred. In this specification, when a carbonyl carbon atom is bonded to the terminal of a chain hydrocarbon group, alkyl group, or alkenyl group, the carbonyl carbon atom is also counted in the number of carbon atoms of the chain hydrocarbon group, etc., and when the carbonyl terminal is present, the alkyl group is sometimes referred to as an alkanoyl group and the alkenyl group as an alkenoyl group. Similarly, in accordance with the lauryl group, an organic group in which the terminal of a straight-chain saturated hydrocarbon group is a carbonyl carbon atom and the total carbon number, including the carbonyl carbon atom, is 12 is sometimes referred to as a lauroyl group.

[0012] The component (a) may be one or more surfactants selected from (a1) a nonionic surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms (hereinafter referred to as component (a1)), (a2) anionic surfactants having a chain hydrocarbon group having from 12 to 22 carbon atoms (however, in the case of fatty acids or compounds derived from fatty acids, the carbonyl carbon is included in the carbon number) (hereinafter referred to as component (a2)), (a3) ​​cationic surfactants having a chain hydrocarbon group having from 12 to 22 carbon atoms (hereinafter referred to as component (a3)), and (a4) amphoteric surfactants having a chain hydrocarbon group having from 12 to 22 carbon atoms (hereinafter referred to as component (a4)). From the viewpoint of further enhancing the cleaning properties, the component (a) is preferably at least one selected from the component (a1) and the component (a2), and more preferably the component (a1).

[0013] <Component (a1)> The component (a1) is a nonionic surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms. Examples of the surfactant of the component (a1) include (a1-1) an amine oxide surfactant (hereinafter referred to as component (a1-1)) and (a1-2) a polyoxyalkylene nonionic surfactant (hereinafter referred to as component (a1-2)).

[0014] The component (a1-1) is an amine oxide surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms. From the viewpoint of further improving detergency, the number of carbon atoms in the chain hydrocarbon group of component (a1-1) is 12 or more and 22 or less, preferably 18 or less, and more preferably 14 or less. From the viewpoint of further improving detergency, the chain hydrocarbon group of component (a1-1) is preferably an alkyl group or alkenyl group, more preferably an alkyl group, and even more preferably a linear alkyl group. The chain hydrocarbon group of component (a1-1) is even more preferably a lauryl group or a lauroyl group. Furthermore, from the viewpoint of further enhancing the detergency upon dilution, it is preferable to use component (a1-1) in combination with a short-chain nonionic surfactant, preferably a branched short-chain nonionic surfactant, which is component (b) described below. It is believed that component (a1-1) and component (b), which are nonionic surfactants with short hydrocarbon chain lengths, and even more so, branched short-chain nonionic surfactants, promote the removal and dispersion of oily stains, and that the inclusion of these components in the liquid detergent composition for hard surfaces of the present invention also contributes to the transparency of the composition's appearance.

[0015] From the viewpoint of further improving cleaning properties, the component (a1-1) is preferably a compound represented by the following general formula (a1-1):

[0016] [ka]

[0017] [In the formula, R 1a is R 1a If a carbonyl carbon atom is bonded to the end of R, it is a hydrocarbon group having 11 to 21 carbon atoms. 1aIf there is no carbonyl carbon atom bonded to the end of R, it represents a hydrocarbon group having 12 to 22 carbon atoms. 2a and R 3a each 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.

[0018] In the above general formula (a1-1), 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 11 or more, and preferably 18 or less, and 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 12 or more, and preferably 18 or less, and more preferably 14 or less. In general formula (a1-1), 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. 2a , R 3a is preferably a methyl group having one carbon atom, from the viewpoint of further improving the cleaning property.

[0019] Preferred examples of the component (a1-1) include: (1) Alkyl (carbon number 12 to 22) dialkyl (carbon number 1 to 3) amine oxides: 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 (a1-1)): lauric acid amidopropyl dimethylamine oxide, myristic acid amidopropyl dimethylamine oxide, These may be used alone or in combination of two or more.

[0020] From the viewpoint of further enhancing cleaning properties, the component (a1-1) is preferably (1) an alkyl (having 12 to 22 carbon atoms) dialkyl (having 1 to 3 carbon atoms) amine oxide, more preferably one or more selected from lauryl dimethyl amine oxide and myristyl dimethyl amine oxide, and even more preferably a combination of lauryl dimethyl amine oxide and myristyl dimethyl amine oxide.

[0021] The component (a1-2) is a polyoxyalkylene-type nonionic surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms. From the viewpoint of further improving cleaning performance, the number of carbon atoms in the chain hydrocarbon group of component (a1-2) is 12 or more and 22 or less, preferably 16 or less, and more preferably 14 or less. From the viewpoint of further improving cleaning performance, the chain hydrocarbon group of component (a1-2) is preferably an alkyl group or alkenyl group, more preferably an alkyl group, and even more preferably a linear alkyl group.

[0022] From the viewpoint of further improving cleaning properties, the component (a1-2) is preferably a compound represented by the following general formula (a1-2). R 4a -O-(R 5a O) t -H (a1-2) [In the formula, R 4a is an alkyl group having 12 to 22 carbon atoms, and R 5a O is one or more selected from alkyleneoxy groups having 2 to 4 carbon atoms, and t is R 5a The average number of moles of O added is 1 or more and 8 or less.

[0023] In general formula (a1-2), R 4a From the viewpoint of further enhancing cleaning performance, R is an alkyl group having 12 or more and 22 or less, preferably 18 or less carbon atoms, and is preferably a straight-chain alkyl group. The carbon atom of the alkyl group bonded to the oxygen atom is preferably a primary carbon atom or a secondary carbon atom, and from the viewpoint of further enhancing cleaning power, a primary carbon atom is more preferred. 5aO can also be an ethyleneoxy group, a propyleneoxy group, or a butyleneoxy group. 5a O is preferably an alkyleneoxy group having 2 or 3 carbon atoms, and specifically, at least one selected from an ethyleneoxy group and a propyleneoxy group is preferred. When multiple types of alkyleneoxy groups are contained, the different alkyleneoxy groups may be bonded in block or random bonds, and each is preferably a structure in which they are bonded in block within the range of the number t described below. Each of the block-bonded blocks may be three or more block units linked together, and may be, for example, two types of block units bonded alternately. R 5a O is preferably an ethyleneoxy group, and t is a number of 1 or more, preferably 3 or more, and 8 or less, more preferably 6 or less, from the viewpoint of further improving cleaning properties.

[0024] The anionic surfactant of component (a2) 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 number of carbon atoms in the alkyl or alkenyl group of these anionic surfactants is, for example, 12 or more and 22 or less. Counterions of the anionic groups of these anionic surfactants include, for example, 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 1 to 3 alkanol groups having 2 or 3 carbon atoms (e.g., monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.).

[0025] From the viewpoint of further enhancing cleaning properties, component (a2) 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 or a salt thereof is 12 or more, and preferably 18 or less, more preferably 14 or less, and the alkyl group is preferably linear. The alkylbenzenesulfonic acid or a salt thereof may be an alkylbenzenesulfonic acid or a salt thereof in which the carbon atom of the alkyl group bonded to the carbon atom of the benzene ring is a secondary carbon atom. The alkyl or alkenyl group of the alkyl or alkenyl sulfate ester and salts thereof has 12 or more carbon atoms, and preferably 18 or less, more preferably 14 or less.

[0026] The cationic surfactant of component (a3) ​​may be a primary amine salt, a secondary amine salt, a tertiary amine salt, or a quaternary ammonium salt. The number of carbon atoms in at least one alkyl or alkenyl group of these cationic surfactants is, for example, 12 to 22. Among these, component (a3) ​​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 12 to 22 carbon atoms, and the remainder is a group selected from a benzyl group, an alkyl group having 1 to 5 carbon atoms, and a hydroxyalkyl group having 1 to 5 carbon atoms. The alkyl or alkenyl group having a total of 12 to 22 carbon atoms may be substituted with an alkoxy group, an alkenyloxy group, an alkanoylamino group, an alkenoylamino group, an alkanoyloxy group, or an alkenoyloxy group, within this carbon number range. Examples of salts of component (a3) ​​include halides and alkyl sulfates having 1 to 3 carbon atoms. Specific examples of halides include chlorides, bromides, and iodides. Specific examples of alkyl sulfates having 1 to 3 carbon atoms include methyl sulfate, ethyl sulfate, and propyl sulfate.

[0027] Examples of the amphoteric surfactant (a4) include one or more selected from 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 compounds, the alkyl group is, for example, a lauryl group or a myristyl group, and the alkanoyl group is, for example, a lauroyl group or a myristyl group.

[0028] <(b) Component> Component (b) is a short-chain nonionic surfactant having one alkyl group having 5 to 10 carbon atoms (excluding those corresponding to component (a)). Component (b) can be used alone or in combination of two or more types.

[0029] From the viewpoint of further enhancing the detergency of denatured oils when diluted, component (b) is a short-chain nonionic surfactant having one alkyl group having 5 or more carbon atoms, preferably 6 or more, more preferably 7 or more, and 10 or less carbon atoms, preferably 9 or less, more preferably 8 or less (however, excluding those corresponding to component (a)). In this specification, when a carbonyl group is bonded to the alkyl group terminal of component (b), the carbonyl carbon atom is also counted as the carbon number of the alkyl group of component (b), and in the case of a carbonyl terminal alkyl group, the alkyl group is sometimes referred to as an alkanoyl group. Furthermore, the short-chain alkyl group of component (b) may be bonded to an organic group having a hydrophilic group via an amide bond or an ester bond, and when component (b) is an amine oxide compound, the short-chain alkyl group may be bonded via an amidopropyl group.

[0030] When component (b) is used in combination with component (a), preferably component (a1), more preferably component (a1-1), the alkyl group of component (b) is preferably a branched chain, more preferably a 2-ethylhexyl group, from the viewpoints of further enhancing detergency and transparency of appearance.

[0031] The hydrophilic group of the nonionic surfactant having a short-chain alkyl group of component (b) is, for example, a group selected from an ethyleneoxy group, a hydroxy group, and an amine-N-oxide group, and when forming a polyalkylene oxide chain, may have propyleneoxy groups in addition to the ethyleneoxy groups in the same number or less as the ethyleneoxy groups, or may be a compound obtained by reacting ethylene oxide with one or more hydroxy groups of a polyol compound having 2 to 8 hydroxy groups. The hydrophilic group may also be a polymer of a polyol or polyol compound having 3 to 6 carbon atoms, such as glycerin or sugar, having a structure with many hydroxy groups.

[0032] From the viewpoint of further improving the cleaning properties when diluted, component (b) preferably has one or more groups selected from a (poly)ethyleneoxy group (also referred to as a (poly)oxyethylene group), a (poly)glyceryl ether group, a (poly)glucoside group, and an amino-N-oxide group, each having an average degree of polymerization of 1 or more and 5 or less, and more preferably has one or more groups selected from a (poly)ethyleneoxy group (or a (poly)oxyethylene group), a (poly)glyceryl ether group, and a (poly)glucoside group, each having an average degree of polymerization of 1 or more and 3 or less. In this specification, (poly) means that the number of repeating units such as ethyleneoxy groups (or oxyethylene groups) is one or more. That is, it means that the ethyleneoxy group (or oxyethylene group), glyceryl ether group, and glucoside group in component (b) are one or more. For example, in component (b), a (poly)ethyleneoxy group (or (poly)oxyethylene group) means a polyoxyethylene group (or polyethyleneoxy group) (-(CHO) n It means both —H (n=2 to 5, preferably 2 or 3) and an oxyethylene group (or ethyleneoxy group) (—(C 2 H 4 O)—H).

[0033] Specific examples of component (b) include (poly)oxyethylene monohexyl ether, (poly)oxyethylene monooctyl ether, (poly)oxyethylene monodecyl ether, (poly)oxyethylene mono 2-ethylhexyl ether, (poly)oxyethylene monoisoamyl ether, and (poly)oxyethylene monoisooctyl ether, each of which has an average degree of polymerization of oxyethylene groups of 1 to 3, and (poly)glyceryl mono 2-ethylhexyl ether, (poly)glyceryl mono n-hexyl ether, (poly)glyceryl monoisoamyl ether, (poly)glyceryl monoisooctyl ether, (poly)glyceryl monooctyl ether, and (poly)glyceryl monoisodecyl ether, each of which has an average bond number (or average degree of polymerization) of 1 to 3. Examples of suitable amines include 2-ethylhexyl (poly)glycerin esters, 2-ethylhexyl (poly)glycerin esters, isoamyl (poly)glycerin esters, isooctyl (poly)glycerin esters, and octyl (poly)glycerin esters, octyl (poly)glucosides having an average degree of polymerization of the glucoside groups of 1 to 3, 2-ethylhexyl (poly)glucosides, isoamyl (poly)glucosides, and isooctyl (poly)glucosides, 2-ethylhexyl dimethylamine oxide, isoamyl dimethylamine oxide, isooctyl dimethylamine oxide, octyl dimethylamine oxide, decyl dimethylamine oxide, octylamidopropyl dimethylamine oxide, decyl amidopropyl amine oxide, and 2-ethylhexyl amidopropyl dimethylamine oxide. These may be used alone or in combination of two or more. Of these, component (b) is preferably one or more selected from glyceryl mono 2-ethylhexyl ether (or 2-ethylhexyl glyceryl ether), glyceryl mono n-hexyl ether (or n-hexyl glyceryl ether), glyceryl monoisodecyl ether (or isodecyl glyceryl ether), 2-hexyloxyethanol, ethylene glycol mono(2-ethylhexyl) ether, and diethylene glycol mono(2-ethylhexyl) ether.

[0034] Component (b) may be a mixture of compounds with different average polymerization degrees, or a single compound. Component (b) may contain unreacted aliphatic alcohol from the synthesis of component (b) to the extent that it does not affect the appearance of the liquid cleaning composition for hard surfaces of the present invention.

[0035] <(c) component> Component (c) is one or more water-soluble organic solvents (excluding those corresponding to components (a) and (b)) 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 (c) is preferably 300 or less. In the water-soluble organic solvent of component (c), water solubility means that the solvent dissolves in water at 20°C at a rate of 20 g / L or more.

[0036] Component (c) preferably contains one or more selected from the group consisting of a (poly)glycol ether compound having 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, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol. Specific examples of the (poly)glycol ether compound include one or more selected from the group consisting of (poly)alkylene glycol monoalkyl ethers, (poly)alkylene glycol monophenyl ethers, and (poly)alkylene glycol monobenzyl ethers.

[0037] The (poly)glycol ether compound of component (c) having an alkyl group, phenyl group, or benzyl group having from 1 to 4 carbon atoms and from 1 to 4 alkyleneoxy groups having from 2 to 3 carbon atoms is preferably a compound represented by the following general formula (c1) from the viewpoint of appearance: R 1c -O-(R 2c O) t -H (c1) [In the formula, R 1cis an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a benzyl group, and R 2c O is an alkyleneoxy group having 2 or 3 carbon atoms, and t is R 2c The number of moles of O added is 1 or more and 4 or less.

[0038] In general formula (c1), R 1c From the viewpoint of further enhancing foaming properties, R is an alkyl group having 1 to 4 carbon atoms, a phenyl group, or a benzyl group, and is preferably an alkyl group having 1 to 4 carbon atoms. 2c From the viewpoints of further enhancing detergency and transparency of appearance, O is an alkyleneoxy group having 2 or 3 carbon atoms, i.e., a group selected from an ethyleneoxy group and a propyleneoxy group, and t is a number of 1 or more and 4 or less, preferably 2 or less.

[0039] Specific examples of component (c) 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, 2-(2-isobutoxyethoxy)ethanol, (mono-, di-, or tri)ethylene glycol monophenyl ether, (mono-, di-, or tri)ethylene glycol monobenzyl ether, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol. From the viewpoint of further enhancing the detergency of the modified oil when used in a diluted state, dipropylene glycol monomethyl ether, One or more selected from ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, 1-butoxy-2-propanol, dipropylene glycol mono-n-butyl ether, 2-isobutoxyethanol, 2-(2-isobutoxyethoxy)ethanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol 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, 2-(2-isobutoxyethoxy)ethanol, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol are more preferred.

[0040] <(d) component> Component (d) is an alkali metal hydroxide. Component (d) can be used alone or in combination of two or more. Examples of component (d) include sodium hydroxide and potassium hydroxide, with sodium hydroxide being preferred. When another compound contained in the composition, such as component (a2), is an acid, the content of component (d) is determined assuming that the acid and component (d) form a salt.

[0041] <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, and preferably deionized water.

[0042] <Composition, optional ingredients, etc.> 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, from the viewpoint of further enhancing cleaning properties, and 10% by mass or less, preferably 8% by mass or less, more preferably 6% by mass or less, from the viewpoint of appearance. Furthermore, when the liquid detergent composition for hard surfaces of the present invention is diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (a) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.05% by mass or more, more preferably 0.1% by mass or more, and even more preferably 0.5% by mass or more, from the viewpoint of further enhancing cleaning performance, and preferably 6% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of appearance. Water can be used to dilute the liquid cleaning composition for hard surfaces of the present invention. Specifically, the water mentioned in the description of the liquid cleaning composition for hard surfaces of the present invention can be used.

[0043] In the liquid detergent composition for hard surfaces of the present invention, when component (a) contains component (a2), the mass of component (a2) is defined as the value converted into the acid form. In addition, in the liquid detergent composition for hard surfaces of the present invention, when component (a) contains component (a3), the mass of component (a3) ​​is specified using the value converted to chloride.

[0044] The liquid detergent composition for hard surfaces of the present invention contains component (b) in an amount of at least 0.01% by mass, preferably at least 0.05% by mass, more preferably at least 0.08% by mass, and even more preferably at least 0.1% by mass, of the composition in order to further enhance cleaning properties when diluted, and in an amount of at most 5% by mass, preferably at most 3% by mass, more preferably at most 2% by mass, and even more preferably at most 1% by mass, in order to further enhance appearance and cleaning properties for film oily stains. Furthermore, when the liquid detergent composition for hard surfaces of the present invention is diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (b) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.005% by mass or more, more preferably 0.008% by mass or more, even more preferably 0.01% by mass or more, and even more preferably 0.04% by mass or more, from the viewpoint of further enhancing cleaning performance, and preferably 4% by mass or less, more preferably 3% by mass or less, even more preferably 1% by mass or less, and even more preferably 0.5% by mass or less, from the viewpoint of appearance.

[0045] The liquid detergent composition for hard surfaces of the present invention contains component (c) in an amount of 5% by mass or more, preferably 6% by mass or more, more preferably 7% by mass or more, from the viewpoint of appearance and further improving the cleaning ability of film-like oil stains, and 15% by mass or less, preferably 14% by mass or less, more preferably 13% by mass or less, from the viewpoint of further improving the cleaning ability of film-like oil stains. Furthermore, when the liquid detergent composition for hard surfaces of the present invention is diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (c) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.2% by mass or more, more preferably 0.4% by mass or more, and even more preferably 1.0% by mass or more, from the viewpoint of further enhancing the cleaning ability of film oils, and preferably 12% by mass or less, more preferably 10% by mass or less, and even more preferably 8% by mass or less, from the viewpoint of further enhancing the cleaning ability of modified oils.

[0046] 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 order to further enhance the cleaning ability for film oil stains, and preferably 20% by mass or less, more preferably 15% by mass or less, and even more preferably 10% by mass or less in order to reduce damage to substrates. Furthermore, when the liquid detergent composition for hard surfaces of the present invention is diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (d) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.2% by mass or more, more preferably 0.4% by mass or more, and even more preferably 0.6% by mass or more, from the viewpoint of further enhancing cleaning performance, and preferably 10% by mass or less, more preferably 5% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of appearance. 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).

[0047] In the liquid detergent composition for hard surfaces of the present invention, the mass ratio of the content of component (b) to the content of component (a) [(b) / (a)] is preferably 0.005 or more, more preferably 0.01 or more, even more preferably 0.03 or more, and even more preferably 0.15 or more, from the viewpoint of further enhancing detergency, and is preferably 1.5 or less, more preferably 1 or less, even more preferably 0.8 or less, and even more preferably 0.5 or less, from the viewpoint of transparency of appearance.

[0048] In the liquid detergent composition for hard surfaces of the present invention, the mass ratio of the total content of components (a) and (b) to the content of component (c) [[(a)+(b)] / (c)] is, from the viewpoint of further enhancing detergency, preferably 0.1 or more, more preferably 0.15 or more, even more preferably 0.2 or more, and 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.

[0049] <(e) component> The liquid detergent composition for hard surfaces of the present invention may optionally contain an alkaline agent other than that corresponding to component (d) [hereinafter referred to as component (e)]. The alkaline agents of component (e) include, for example, inorganic and organic alkaline agents excluding those that fall under component (d).Specific examples of inorganic alkaline agents excluding those that fall under component (d) include alkali metal carbonates and alkali metal silicates, which are salts of weak acids and strong bases. From the viewpoint of suppressing the effect of a decrease in pH due to contamination and ensuring cleaning properties, component (e) is preferably an organic alkali agent, and more preferably an alkanolamine, which is an organic alkali agent. The alkanolamine of component (e) is, for example, one or more compounds selected from monoethanolamine, diethanolamine, triethanolamine, N-methylmonoethanolamine, N-methyldiethanolamine, and N,N-dimethylmonoethanolamine, with monoethanolamine being preferred. In the present invention, salts of organic acids and strong bases are counted as organic acid salts. For example, salts of polycarboxylic acids and alkali metals, such as sodium citrate, sodium succinate, and sodium tartrate, as well as sodium fatty acids, are classified as organic acids and their salts.

[0050] When the liquid detergent composition for hard surfaces of the present invention contains component (e), the liquid detergent composition for hard surfaces of the present invention contains component (e) in an amount of preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, in order to further enhance the cleaning ability of film oil stains. Furthermore, when the liquid detergent composition for hard surfaces of the present invention contains component (e) and is further diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (e) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.02% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, from the viewpoint of further enhancing cleaning performance, and preferably 6% by mass or less, more preferably 5% by mass or less, and even more preferably 4% by mass or less, from the viewpoint of appearance.

[0051] <Component (f)> The liquid detergent composition for hard surfaces of the present invention may optionally contain one or more selected from (f)(f1) short-chain alkylbenzenesulfonic acids and salts thereof in which one to three hydrogen atoms on the benzene ring are substituted with alkyl groups having from 1 to 4 carbon atoms (hereinafter referred to as component (f1)), and (f2) fatty acids and salts thereof having from 8 to 10 carbon atoms (hereinafter referred to as component (f2)). Component (f) may be a hydrotropic agent from the viewpoint of maintaining the stability of the composition and maintaining its appearance. When the liquid detergent composition for hard surfaces of the present invention further contains component (f), the high temperature stability of the composition is improved.

[0052] Salts of component (f) include alkali metal salts such as sodium salts and potassium salts; alkaline earth metal salts such as calcium salts and magnesium salts; ammonium salts; and salts of alkanolamines having 1 to 3 alkanol groups having 2 or 3 carbon atoms (e.g., monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, etc.). The salt of component (f) is preferably a sodium or potassium salt.

[0053] Examples of the component (f1) include meta-xylene sulfonic acid or a salt thereof, and para-toluene sulfonic acid or a salt thereof, and examples of the component (f2) include a fatty acid having 8 carbon atoms or a salt thereof. From the viewpoint of further enhancing storage stability, the component (f) is preferably at least one selected from meta-xylene sulfonic acid, para-toluene sulfonic acid, a linear fatty acid having 8 carbon atoms, and alkali metal salts thereof.

[0054] 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 0.01% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and preferably 5% by mass or less, more preferably 4% by mass or less, even more preferably 3% by mass or less, in order to further enhance storage stability. In the liquid cleaning composition for hard surfaces of the present invention, the mass of component (f) is specified using the value converted to the acid form. Furthermore, when component (f) is used as an acid, component (d) is consumed by neutralization of component (f), and the concentration of component (d) is lower than the concentration of component (d). This consumption of component (d) by neutralization of component (f) is not included in the content of component (d). Furthermore, when the liquid detergent composition for hard surfaces of the present invention contains component (f) and is further diluted for use, it is preferable to dilute the liquid detergent composition for hard surfaces of the present invention so that the content of component (f) in the diluted solution of the liquid detergent composition for hard surfaces of the present invention is preferably 0.01 mass% or more, more preferably 0.015 mass% or more, and even more preferably 0.2 mass% or more from the viewpoint of appearance, and preferably 2.0 mass% or less, more preferably 1.5 mass% or less, and even more preferably 1 mass% or less from the viewpoint of further improving cleaning performance.

[0055] 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 80% by mass or less.

[0056] The liquid detergent composition for hard surfaces of the present invention may optionally contain ingredients such as anti-gelling agents, thickeners such as polyacrylic acid, fragrances, dyes, pigments, disinfectants, preservatives, and pH adjusters (excluding those corresponding to components (a) to (f)).

[0057] 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.

[0058] 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.

[0059] When the alkalinity of the liquid detergent composition for hard surfaces of the present invention is high, it is difficult to measure the pH exceeding 14. In order to confirm that the liquid detergent composition for hard surfaces of the present invention is highly alkaline, it is preferable that 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 12 or more, and more preferably 14 or less. Therefore, from the viewpoint of further enhancing the detergency, the pH of an aqueous solution containing 1% by mass of the liquid detergent composition for hard surfaces of the present invention (that is, an aqueous solution obtained by diluting the liquid detergent composition for hard surfaces 100 times with water) at 25 °C is preferably 12 or more, more preferably 12.5 or more, still more preferably 13 or more, and preferably 14 or less. 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.

[0060] <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. The internal solution of the pH electrode uses a saturated potassium chloride aqueous solution (3.33 mol / L). Next, fill 100 mL beakers with pH 4.01 standard solution (phthalate standard solution), pH 6.86 (neutral phosphate standard solution), and pH 9.18 standard solution (borate standard solution) respectively, and immerse them in a constant temperature bath at 25 °C for 30 minutes. Immerse the pH measurement electrode in the standard solution adjusted to a constant temperature 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.

[0061] The viscosity of the liquid cleaning composition for hard surfaces of the present invention at 25°C is preferably 50 mPa·s or less, more preferably 30 mPa·s or less, even more preferably 20 mPa·s or less, and even more preferably 15 mPa·s or less, from the viewpoint of further improving spray dischargeability. This viscosity is measured using a Brookfield viscometer, using a rotor recommended for the viscosity to be measured from among rotors No. 1 to No. 3, at 60 r / min, and is the reading 1 minute after the start of measurement. The liquid cleaning composition for hard surfaces is measured at a temperature adjusted to 25±1°C. If there are multiple rotors that satisfy the conditions, the value measured using the rotor with the smaller number is used.

[0062] The liquid detergent composition for hard surfaces of the present invention may be a liquid detergent composition for use on the surface of a hard article. The hard article is preferably tableware and / or a hard article for use in the kitchen. Specific examples of the hard surface 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.

[0063] 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.

[0064] <How to clean hard surfaces> The present invention provides a method for cleaning a hard surface, which comprises contacting a hard surface with a liquid detergent composition for hard surfaces, the composition comprising: (a) 1 to 10 mass% of a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms; (b) 0.01 to 5 mass% of a short-chain nonionic surfactant having one alkyl group having from 5 to 10 carbon atoms (excluding those falling under component (a)); (c) 5 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 falling under component (a) and component (b)); and (d) an alkali metal hydroxide and water, the composition having 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.

[0065] In the method for cleaning a hard surface of the present invention, the hard surface may be the surface of a hard article. Specifically, the hard surface may be the surface of a hard article listed 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.

[0066] 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.

[0067] In the method for cleaning hard surfaces 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. Furthermore, "contacting the liquid detergent composition for hard surfaces without dilution with the surface of a hard article having oily soiling containing denatured oil, particularly heat-denatured oil, attached thereto" means that the detergent composition is not intentionally diluted with water or the like and then brought into contact with a hard article having soiling containing liquid oil derived from food attached thereto. 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 are attached to the hard article after the liquid detergent composition for hard surfaces has been brought into contact with the hard article, it can be understood that the liquid detergent composition for hard surfaces without dilution has been brought into contact 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.

[0068] The method for cleaning hard surfaces of the present invention involves contacting the liquid detergent composition with a hard object having oily soiling containing a modified oil, particularly a thermally modified oil, followed by rinsing with water. After contact, the liquid detergent composition may be applied with or without external force such as mechanical force using a flexible material such as a sponge or fingers.

[0069] 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, and preferably 100 or less, more preferably 80 or less, and even more preferably 20 or less.

[0070] 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 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]

[0071] The liquid detergent compositions for hard surfaces shown in Table 1 were prepared using the following components (a) to (f), 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 a glass pH meter. The mass % of each component in Table 1 is all based on the pure content. The concentration of component (d) in Examples 1-13 and 1-14 is the concentration excluding the amount consumed by component (f), and component (f) is shown as the concentration of its acid form.

[0072] <Component (a)> (a1) Nonionic surfactant: Amphitol 20N, lauryl dimethylamine oxide, manufactured by Kao Corporation; in the general formula (a1-1), R 1a is a lauryl group, R 2a , R 3a is a methyl group, and p=0 (a2) Anionic surfactant: Neopelex G-25, sodium dodecylbenzenesulfonate, manufactured by Kao Corporation

[0073] <Component (b): Short-chain nonionic surfactant> GE-EH: 2-ethylhexyl glyceryl ether, manufactured by Kao Corporation NHG: n-Hexylglyceryl ether, manufactured by Kao Corporation GE-ID: Isodecyl glyceryl ether, manufactured by Kao Corporation HeG: 2-hexyloxyethanol, manufactured by Kao Corporation EHG: Ethylene glycol mono(2-ethylhexyl) ether, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. EHDG: Diethylene glycol mono(2-ethylhexyl) ether, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0074] <(c) component> BDG-NS: Butyl carbitol (diethylene glycol monobutyl ether) <(d) component> Sodium hydroxide: Nankai Chemical Co., Ltd. <(e) component> Monoethanolamine: Nippon Shokubai Co., Ltd. <Component (f)> Metaxylene sulfonic acid: manufactured by Itochu Chemical Frontier Corporation <Water> Deionized tap water (deionized water)

[0075] (1) Appearance evaluation After preparing each liquid cleaning composition for hard surfaces in Table 1, it was placed in a transparent plastic container and visually confirmed whether or not it was cloudy. A transparent composition is a composition with excellent initial composition stability.

[0076] (2) Detergency of denatured oil when diluted The detergency for denatured oil of each of the hard surface liquid detergent compositions in Table 1 when diluted was evaluated by the following method. This evaluation was conducted to evaluate the detergency for sticky oil stains that are slightly denatured and 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 cleaning ability 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 x 140 x 25 mm), and a Biore u foam pump former was used to foam the hard surface liquid detergent composition shown in Table 1, diluted 5 times, onto the SUS plates to cover the dirt. The plates were then left to stand for 5 minutes. The plates were then rinsed with tap water for 1 minute at 300 rpm using a Lenauts tester, and then left to dry 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). Detergency evaluation was performed using three SUS plates for each type of liquid detergent composition for hard surfaces, and the average cleaning rate for the three plates was calculated. The evaluation was performed based on the average cleaning rate calculated according to the following criteria. The results are shown in Table 1. The higher the cleaning rate, the better the detergent composition's ability to clean denatured oil when diluted. In particular, this composition is excellent at cleaning sticky oil stains even after short-term treatment. A cleaning performance rating of "A" or "B" is preferable because it has high cleaning performance against denatured oil. 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.

[0077] (3) Cleaning ability against film oil stains The cleaning ability of each hard surface liquid detergent composition in Table 1 for film oil (baked-on oil) was evaluated by the following method. This evaluation was conducted to evaluate the cleaning ability for oil stains that have been severely altered and adhere to a trivet, gas range, 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 ability A 0.1 mL drop of each liquid hard surface cleaning composition listed in Table 1 was applied 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 hard surface cleaning composition 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 criteria. Compositions rated "A," i.e., compositions that removed the 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, compositions that removed the soiling by wiping the SUS surface with a Kimwipe after rinsing were also rated "D." <Evaluation criteria> A: The oily film stains were removed by rinsing with water. D: The stains didn't come off.

[0078] (4) Evaluation of high-temperature storage stability The liquid detergent compositions for hard surfaces of Examples 1-13 and 1-14 in Table 1 were placed in transparent plastic containers and allowed to stand in a thermostatic bath at 50°C, after which the appearance of the compositions was visually observed. Example 1-13 was rated "A", and Example 1-14 was rated "B", and both compositions were found to have excellent high-temperature storage stability. <Evaluation criteria> A: The appearance of the composition did not change for more than 20 days after preparation. B: The appearance changed 10 to 20 days after the composition was prepared. C: The appearance changed 2 days or more but less than 10 days after the composition was prepared. D: The appearance changed within one day after the composition was prepared.

[0079] [Table 1]

[0080] The viscosity of the liquid detergent compositions for hard surfaces in the examples of the present invention was 10 mPa s or less, and they showed good sprayability when sprayed using a trigger-type spray container. In particular, the viscosity of the composition in Examples 1-13 was 5.1 mPa s (25°C), showing excellent sprayability.

[0081] Furthermore, the liquid detergent compositions for hard surfaces of the present invention exhibited high detergency even when diluted with water. The compositions of Examples 1-3, 1-4, and 1-12 exhibited favorable detergency even when diluted 10 times, and the detergency rating for the 10-fold dilution was "B."

Claims

1. (a) a surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms in an amount of from 1% by mass to 10% by mass, (b) 0.01% by mass or more and 5% by mass or less of a short-chain nonionic surfactant having one alkyl group having 5 to 10 carbon atoms (excluding those corresponding to component (a)), (c) 5% by mass or more and 15% by mass or less 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 components (a) and (b)), (d) containing an alkali metal hydroxide and water; A liquid cleaning composition for hard surfaces, having a pH of 12.0 or higher at 25°C.

2. 2. The liquid cleaning composition for hard surfaces according to claim 1, further comprising: (f1) a short-chain alkylbenzenesulfonic acid and its salt in which one or more hydrogen atoms on the benzene ring are substituted with an alkyl group having 1 to 4 carbon atoms; and (f2) a fatty acid and its salt having 8 to 10 carbon atoms, in an amount of 0.01% by mass to 5% by mass.

3. 3. The liquid cleaning composition for hard surfaces according to claim 1, wherein component (b) has one or more groups selected from the group consisting of a (poly)ethyleneoxy group, a (poly)glyceryl ether group, and a (poly)glucoside group, each having an average degree of polymerization of 1 or more and 3 or less.

4. 3. The liquid cleaning composition for hard surfaces according to claim 1, wherein the component (c) comprises one or more selected from the group consisting of a (poly)glycol ether compound having an alkyl group, a phenyl group, or a benzyl group having 1 to 4 carbon atoms and one to four alkyleneoxy groups having 2 or 3 carbon atoms, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, ethanol, and propanol.

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 surfactant having a chain hydrocarbon group having from 12 to 22 carbon atoms; (b) 0.01% by mass to 5% by mass of a short-chain nonionic surfactant having one alkyl group having from 5 to 10 carbon atoms (excluding those corresponding to component (a)); (c) 5% 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) and component (b)); and (d) an alkali metal hydroxide and water, the liquid detergent composition having a pH of 12.0 or higher at 25°C, the composition comprising:

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