Disinfectant composition for hard surfaces

Abstract

To provide a disinfection composition for surface treatment that has high sterilization power even in a region where stimulation to a hand skin is none and the pH is neutral and in a case where a content of a cationic surfactant is remarkably less, and that can be uniformly coated on a target surface, a hard surface treatment method with the composition, as well as a wettability improving method of a disinfectant for surface treatment containing the cationic surfactant.SOLUTION: A hard surface treatment method comprises: contacting a disinfectant composition for hard surface with a hard surface on which bacteria are present; and, after the contact, allowing the disinfectant composition to stand or dry without a rinsing step, where the disinfectant composition for hard surface comprises (a) 0.0001 mass% to 1.0 mass% of a cationic surfactant [hereinafter referred to as component (a)], (b) at least one or more surfactants selected from amidoalkylamine oxide-type surfactants, betaine-type surfactants, and alkyl glycoside-type surfactants [hereinafter referred to as component (b)], and (c) one or more organic acids or their salts selected from α-hydroxycarboxylic acids, polybasic acids (excluding α-hydroxycarboxylic acids), and salts thereof [hereinafter referred to as component (c)], wherein a mass ratio, (a) / (b), of the content of component (a) to the content of component (b) is 0.01 to 15, and a mass ratio, (c) / (b), of the content of component (c) and the content of component (b) is 0.5 to 100, and a pH of the disinfectant composition is 4.0 to 9.0 at 20°C.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a disinfectant composition for hard surfaces, a method for treating a hard surface, and a method for improving the wetting and spreading properties of a disinfectant composition for hard surfaces. [Background technology]

[0002] In recent years, a technique of contacting a disinfectant composition with an object such as a kitchen or table from the viewpoint of hygiene and safety has been used. In addition, most of such disinfectant compositions often use a volatile disinfectant solvent such as ethanol. However, such solvents have the problem of exhibiting a peculiar odor during the drying process and of insufficient disinfection effect. In addition, since the disinfectant effect is lost after drying, there is another problem that the disinfectant effect is not sustained (hereinafter, the durability of the disinfectant effect is also referred to as antibacterial effect). In addition, it is possible to contact a compound having a non-volatile disinfectant effect with an object, but it is desirable to reduce the amount of use as much as possible from the viewpoint of oral contact such as licking by young children and percutaneous contact such as absorption by the skin.

[0003] Techniques for using a surfactant such as an amine oxide in combination with a cationic surfactant are known. Patent Document 1 discloses a technology for an antibacterial agent for toilets that contains a cationic surfactant, and discloses that the antibacterial effect can be improved by using an amine oxide or a nonionic surfactant in combination. Patent Document 2 discloses a technology for a damp odor inhibitor that uses a cationic surfactant in combination with amidopropylamine oxide. Patent Document 3 discloses a technology for a germicidal cleaner that uses a surfactant such as an alkyl glycoside or amidopropyl betaine in combination with a cationic surfactant.

[0004] On the other hand, organic acids such as citric acid and lactic acid are substances obtained by means of fermentation or the like, and are known to have a high bactericidal effect when acidic. Patent Document 4 discloses an antibacterial composition using an organic acid in combination with a surfactant. The document also describes a technique of using a cationic surfactant such as benzalkonium chloride in combination as the surfactant. Patent Document 5 discloses a disinfectant composition containing an organic carboxylic acid, an inorganic acid, and a quaternary ammonium salt. Patent Document 6 discloses a germicidal cleaning agent composition containing an organic acid and a cationic surfactant. Patent Document 7 discloses a cleaning sheet impregnated with an aqueous disinfectant that contains a quaternary ammonium salt type surfactant and an organic acid and has a pH of 4.8 to 8.0. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-143621 A [Patent Document 2] JP 2009-263812 A [Patent Document 3] JP 2004-526833 A [Patent Document 4] Special Publication No. 2011-524341 [Patent Document 5] JP 2009-51756 A [Patent Document 6] Japanese Patent Application Publication No. 11-35974 [Patent Document 7] JP 2018-90564 A Summary of the Invention [Problem to be solved by the invention]

[0006] Cationic surfactants are known to have excellent disinfecting effects, but because cationic surfactants are water repellent, when an aqueous composition containing them is brought into contact with an object, it does not spread but becomes localized on the water droplets. In this state, a sufficient disinfecting effect is obtained in the localized area, but in the repelled area, an effective amount of the cationic surfactant is not present, and the disinfecting effect is not obtained. In addition, in order to impart an antibacterial effect to an object, it is necessary to leave a cationic surfactant on the object. However, for objects where oral contact or percutaneous contact, such as absorption through the skin, is likely, it is desirable to reduce the amount of cationic surfactant used as much as possible. In addition, if a large amount of surfactant is left on the object, it can lead to a poor feel, such as a slimy texture, so it is desirable to reduce the amount used as much as possible. One method for improving the wetting and spreading properties of an aqueous composition containing a cationic surfactant is to use a surfactant other than a cationic surfactant in combination with the cationic surfactant. However, it is necessary to reduce the amount of such surfactant used as much as possible, and if a large amount is used, there is also the problem that the disinfecting effect is impaired. Therefore, there is a need for a technique for uniformly spreading an aqueous composition containing a small amount of a cationic surfactant.

[0007] The present invention provides a disinfectant composition for hard surfaces which has a high disinfecting power even when the pH is in the weakly acidic to neutral range that is not irritating to the skin of the hands and contains a significantly small amount of cationic surfactant, and which can be uniformly applied to a target surface; a method for treating a hard surface using the composition; and a method for improving the wetting and spreading property of a disinfectant composition for hard surfaces containing a cationic surfactant. [Means for solving the problem]

[0008] The present invention relates to a disinfectant composition for hard surfaces, which contains (a) a cationic surfactant [hereinafter referred to as component (a)] in an amount of 0.0001% by mass or more and 1.0% by mass or less, and (b) one or more surfactants selected from amidoalkylamine oxide type surfactants, betaine type surfactants, and alkylglycoside type surfactants [hereinafter referred to as component (b)], wherein the mass ratio (a) / (b) of the content of component (a) to the content of component (b) is 0.01 or more and 15 or less, and the pH at 20°C is 4.0 or more and 9.0 or less.

[0009] The present invention also relates to a method for treating a hard surface, which comprises contacting the disinfectant composition for hard surfaces with a hard surface on which bacteria are present.

[0010] The present invention also relates to a method for improving the wetting and spreading property of a disinfectant composition for hard surfaces, which contains (a) a cationic surfactant [hereinafter referred to as component (a)] and has a pH of 4.0 to 9.0, and which comprises mixing (b) one or more surfactants selected from amidoalkylamine oxide type surfactants, betaine type surfactants, and alkylglycoside type surfactants [hereinafter referred to as component (b)] such that the mass ratio (a) / (b) of the amount of component (a) mixed to the amount of component (b) mixed is 0.01 to 15. Effect of the Invention

[0011] According to the present invention, there are provided a disinfectant composition for hard surfaces which has a high disinfecting power even when the pH is in the weakly acidic to neutral range that is not irritating to the skin of the hands and contains a significantly small amount of cationic surfactant, and which can be uniformly applied to a target surface; a method for treating a hard surface using the composition; and a method for improving the wetting and spreading property of a disinfectant composition for hard surfaces containing a cationic surfactant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [Disinfectant composition for hard surfaces] <Component (a)> The component (a) of the present invention is a cationic surfactant. Examples of the cationic surfactant include quaternary ammonium salt cationic surfactants. Examples of the quaternary ammonium salt cationic surfactant include quaternary ammonium salt cationic surfactants in which one or two of the groups bonded to the nitrogen atom are hydrocarbon groups having 6 to 18 carbon atoms, preferably 8 to 14 carbon atoms, more preferably 10 to 12 carbon atoms, and preferably an alkyl group, and the remaining groups are groups selected from the group consisting of alkyl groups having 1 to 3 carbon atoms, hydroxyalkyl groups having 1 to 3 carbon atoms, and arylalkyl groups (benzyl groups, etc.), preferably groups selected from the group consisting of methyl groups, ethyl groups, and benzyl groups. Among these, quaternary ammonium salt cationic surfactants having disinfecting performance and cleaning power are preferred, and quaternary ammonium salt cationic surfactants having a benzyl group are preferred from the viewpoint of disinfecting performance.

[0013] The cationic surfactant is preferably a compound represented by the following general formula (a1).

[0014] [ka]

[0015] [In the formula, R 1a R represents a hydrocarbon group having 6 to 18 carbon atoms. 2a , R 3a R each independently represents an alkyl group having 1 to 3 carbon atoms. 4a represents an alkylene group having 1 to 3 carbon atoms. - represents an anion.

[0016] In general formula (a1), R 1a From the viewpoint of disinfecting properties, is preferably a hydrocarbon group having 8 or more carbon atoms, more preferably 10 or more, and preferably 16 or less carbon atoms, preferably an alkyl or alkenyl group, more preferably an alkyl group. In addition, in the general formula (a1), R 2a , R 3aeach independently represents an alkyl group having 1 to 3 carbon atoms, preferably an alkyl group having 1 to 2 carbon atoms, and more preferably a methyl group. In addition, in the general formula (a1), R 4a represents an alkylene group having 1 to 3 carbon atoms, preferably an alkylene group having 1 to 2 carbon atoms, and more preferably a methylene group. In addition, Z in the general formula (a1) - Z is preferably a halogen ion such as a chloride ion. - As for chloride ions (Cl - ) is more preferred.

[0017] <(b) Component> The component (b) of the present invention is one or more surfactants selected from amidoalkylamine oxide surfactants, betaine surfactants, and alkylglycoside surfactants.

[0018] Examples of the amidoalkylamine oxide surfactant include compounds represented by the following general formula (b1). [ka]

[0019] [In the formula, R 1b represents a hydrocarbon group having 7 to 22 carbon atoms, preferably an alkyl or alkenyl group, more preferably an alkyl group; R 2b and R 3b are the same or different and each represents an alkyl group having 1 to 3 carbon atoms; D represents an -NHC(=O)- group or a -C(=O)NH- group; and E represents an alkylene group having 1 to 5 carbon atoms.

[0020] In the above general formula (b1), R 1b From the viewpoint of wetting and spreading properties, R is preferably an alkyl group having 9 to 18 carbon atoms, more preferably an alkyl group having 11 to 16 carbon atoms, even more preferably an alkyl group having 11 to 14 carbon atoms, and still more preferably an alkyl group having 11 carbon atoms. 2b , R 3bFrom the viewpoint of solubility in water, is preferably a methyl group having one carbon atom. Also, D is preferably a -C(=O)NH- group.

[0021] The betaine type surfactant may be one or more surfactants selected from sulfobetaine and carbobetaine.

[0022] Examples of sulfobetaines include N-alkyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, in which the carbon number of the alkyl group is preferably 10 or more from the viewpoint of wet spreadability, and preferably 18 or less, more preferably 14 or less from the viewpoint of solubility in water; N-alkyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, in which the carbon number of the alkyl group is preferably 10 or more from the viewpoint of wet spreadability, and preferably 18 or less, more preferably 14 or less from the viewpoint of solubility in water; N-alkanoylaminopropyl-N,N-dimethyl-N-sulfopropylammonium sulfobetaine, in which the carbon number of the alkanoyl group is preferably 10 or more from the viewpoint of wet spreadability, and preferably 18 or less, more preferably 14 or less from the viewpoint of solubility in water; and N-alkanoylaminopropyl-N,N-dimethyl-N-(2-hydroxysulfopropyl)ammonium sulfobetaine, in which the carbon number of the alkanoyl group is preferably 10 or more from the viewpoint of wet spreadability, and preferably 18 or less, more preferably 14 or less from the viewpoint of solubility in water.

[0023] Examples of carbobetaines include N-alkyl-N,N-dimethyl-N-carboxymethylammonium betaines having an alkyl group with preferably 10 or more carbon atoms from the viewpoint of wetting and spreading properties, and preferably 18 or less, more preferably 14 or less, from the viewpoint of solubility in water, and compounds represented by the following general formula (b2).

[0024] [ka]

[0025] [In the formula, R4b represents an alkyl or alkenyl group having 7 to 21 carbon atoms; R 5b represents a propylene group, and R 6b and R 7b each independently represents an alkyl group having 1 to 3 carbon atoms.

[0026] In general formula (b2), R 4b represents an alkyl or alkenyl group having a carbon number of preferably 9 or more, more preferably 11 or more, from the viewpoint of wetting and spreading property, and preferably 15 or less, more preferably 13 or less, from the viewpoint of solubility in water, and is preferably a nonyl group, a decyl group, an undecyl group, a dodecyl group, or a tridecyl group. In general formula (b2), R 6b and R 7b are each independently preferably a methyl group from the viewpoint of solubility in water.

[0027] As the alkyl glycoside surfactant, from the viewpoint of wetting and spreading properties, a compound represented by the following general formula (b3) is preferred. R 8b -(OR 9b ) x G y (b3) [In the formula, R 8b is an alkyl group having a linear carbon number of 8 or more, preferably 10 or more, from the viewpoint of wettability and spreadability, and having a linear carbon number of 18 or less, preferably 16 or less, more preferably 14 or less, from the viewpoint of solubility in water; R 9b is an alkylene group having 2 to 4 carbon atoms, preferably an ethylene group or a propylene group, more preferably an ethylene group; G is a residue derived from a reducing sugar; x is a number having an average value of 0 to 6; y is a number having an average value of 1 or more and 10 or less, preferably 5 or less, more preferably 2 or less.

[0028] In the compound of general formula (b3), G is a residue derived from a reducing sugar, and the reducing sugar of the raw material of G may be either an aldose or a ketose. In addition, the reducing sugar of the raw material of G may be a triose having a carbon number of 3, a tetrose having a carbon number of 4, a pentose having a carbon number of 5, or a hexose having a carbon number of 6. Specific examples of the aldose include apiose, arabinose, galactose, glucose, lyxose, mannose, gulose, aldose, idose, talose, and xylose. Specific examples of the ketose include fructose. Among these, the reducing sugar of the raw material of G of the present invention is an aldopentose, which is an aldose having a carbon number of 5, or an aldohexose, which is an aldose having a carbon number of 6, more preferably glucose, from the viewpoint of wettability and spreadability.

[0029] From the viewpoint of wetting and spreading properties, the component (b) is preferably one or more selected from the group consisting of the compounds of general formula (b1), the compounds of general formula (b2), and the compounds of general formula (b3), more preferably one or more selected from the compounds of general formula (b1) and the compounds of general formula (b2), and even more preferably the compound of general formula (b1).

[0030] <Composition, etc.> Although the mechanism of action of the present invention is not clear, it is presumed that the complex of the (a) component and the (b) component is more hydrophilic than other surfactant combinations, and therefore has the effect of significantly lowering the surface tension of the solid-liquid interface even at a very low concentration. Therefore, the disinfectant composition for hard surfaces of the present invention can be uniformly applied to the target surface and can exert a disinfecting effect.

[0031] The disinfectant composition for hard surfaces of the present invention contains component (a) in an amount of 0.001% by mass or more, preferably 0.005% by mass or more, more preferably 0.008% by mass or more, and even more preferably 0.01% by mass or more from the viewpoint of disinfecting property, and in an amount of 1.0% by mass or less, preferably 0.5% by mass or less, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less from the viewpoint of wetting and spreading property and / or mildness to the hand skin. However, the content of component (a) is the content when the anion of component (a) is converted into that of chloride ion.

[0032] The disinfectant composition for hard surfaces of the present invention contains the component (b) in an amount of preferably 0.01% 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 wetting and spreading properties, and in an amount of preferably 0.5% by mass or less, more preferably 0.3% by mass or less, and even more preferably 0.2% by mass or less from the viewpoint of mildness to the hand skin.

[0033] In the disinfectant composition for hard surfaces of the present invention, the total content of the (a) component and the (b) component is preferably 0.011% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and even more preferably 0.15% by mass or more from the viewpoint of disinfection, and is preferably 1.5% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.2% by mass or less, and even more preferably 0.15% by mass or less from the viewpoint of mildness to the hand skin. However, the content of the (a) component is the content when the anion of the (a) component is converted to that of a chloride ion.

[0034] In the disinfectant composition for hard surfaces of the present invention, the mass ratio (a) / (b) of the content of the component (a) to the content of the component (b) is, from the viewpoint of wetting and spreading, 0.01 or more, preferably 0.1 or more, more preferably 0.3 or more, and 15 or less, preferably 5 or less, more preferably 3 or less, even more preferably 2 or less, and even more preferably 1 or less. However, the content of the component (a) is the content when the anion of the component (a) is converted into that of a chloride ion.

[0035] From the viewpoint of antibacterial properties, the disinfectant composition for hard surfaces of the present invention preferably contains, as component (c), one or more organic acids or salts thereof selected from α-hydroxycarboxylic acids, polybasic acids (excluding α-hydroxycarboxylic acids), and salts thereof.

[0036] Alpha-hydroxycarboxylic acids consist of mono- or polycarboxylic acids bearing one or more hydroxyl functional groups, at least one of which is introduced at the alpha position of the acid (the carbon adjacent to the carboxyl functional group). The α-hydroxycarboxylic acid or its salt may be one or more selected from lactic acid, citric acid, malic acid, methyllactic acid, phenyllactic acid, mandelic acid, glycolic acid, tartronic acid, tartaric acid, gluconic acid, and salts thereof. The salt of the α-hydroxycarboxylic acid may be an inorganic salt or an organic salt.

[0037] A polybasic acid is an acid that contains two or more hydrogen atoms in one molecule that can neutralize a base. Polybasic acids exclude alpha-hydroxycarboxylic acids. The polybasic acid or its salt may be at least one selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, and salts thereof. The salt of the polybasic acid may be an inorganic salt or an organic salt.

[0038] The component (c) is preferably contained because it can further impart an antibacterial effect to the disinfectant composition of the present invention. From the viewpoint of antibacterial properties, the component (c) is preferably lactic acid, citric acid, malic acid, glycolic acid, glutaric acid, oxalic acid, malonic acid, succinic acid, adipic acid, maleic acid, and salts thereof, more preferably lactic acid, citric acid, malic acid, glycolic acid, succinic acid, adipic acid, maleic acid, and salts thereof, and even more preferably lactic acid, citric acid, malic acid, and salts thereof.

[0039] The disinfectant composition for hard surfaces of the present invention contains the component (c) 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 2.0% by mass or less, more preferably 1.5% by mass or less, even more preferably 1.0% by mass or less, from the viewpoint of imparting an antibacterial effect to the present invention. However, the content of the component (c) is the content of the component (c) converted into an acid form.

[0040] In the disinfectant composition for hard surfaces of the present invention, the mass ratio (c) / (a) of the content of the (a) component to the content of the (c) component is preferably 1 or more, more preferably 3 or more, even more preferably 5 or more, and preferably 200 or less, more preferably 50 or less, even more preferably 20 or less, from the viewpoint of imparting antibacterial effect to the present invention. However, the content of the (a) component is the content when the anion of the (a) component is converted into that of a chloride ion. The content of the (c) component is the content when the (c) component is converted into an acid form.

[0041] In the disinfectant composition for hard surfaces of the present invention, it is preferable to contain the component (c) since it can further improve the effect of the wet spreadability of the component (b). In the disinfectant composition for hard surfaces of the present invention, the mass ratio (c) / (b) of the content of the component (b) to the content of the component (c) is preferably 0.5 or more, more preferably 1 or more, even more preferably 3 or more, even more preferably 4 or more, and preferably 100 or less, more preferably 50 or less, even more preferably 25 or less, and even more preferably 10 or less, from the viewpoint of wet spreadability. However, the content of the component (c) is the content of the component (c) converted into an acid form.

[0042] In the disinfectant composition for hard surfaces of the present invention, the total surfactant content is, from the viewpoint of mildness to hand skin, preferably 0.01% by mass or more, more preferably 0.03% by mass or more, even more preferably 0.05% by mass or more, and preferably 1.0% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.2% by mass or less.

[0043] In the disinfectant composition for hard surfaces of the present invention, the mass ratio of the total content of the components (a) and (b) to the total content of the surfactants, [(a)+(b)] / (total surfactants), is preferably 0.6 or more, more preferably 0.7 or more, even more preferably 0.8 or more, and still more preferably 0.9 or more and 1.0 or less, from the viewpoint of mildness to hand skin.

[0044] From the viewpoint of wetting and spreading, the disinfectant composition for hard surfaces of the present invention preferably contains (d) a volatile organic solvent (hereinafter referred to as component (d)). In the present invention, the volatile organic solvent refers to an organic solvent having a boiling point of 250° C. or less when the external pressure is 1.00 atm.

[0045] The component (d) can be one or more volatile organic solvents selected from the following compounds (d1) to (d3). (d1): Aliphatic alcohol with 2 to 7 carbon atoms (d2): Alkyl glycol ether having an alkyl group carbon number of 1 to 6 (d3): Aliphatic diol having 2 to 6 carbon atoms

[0046] Examples of the aliphatic alcohol having 2 to 7 carbon atoms (d1) include one or more selected from ethanol, 1-propanol, 1-butanol, 2-butanol, 1-pentanol, 3-pentanol, cyclopentanol, 1-hexanol, and 1-heptanol.

[0047] Examples of the alkyl glycol ether having an alkyl group having 1 to 6 carbon atoms (d2) include one or more selected from butyl diglycol, hexyl glycol, hexyl diglycol, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, butyl glycol, dipropylene glycol monopropyl ether, and propylene glycol monopropyl.

[0048] The aliphatic diol (d3) having 2 to 6 carbon atoms may be one or more selected from ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,2-hexanediol, 1,2-pentanediol, and 1,6-hexanediol.

[0049] From the viewpoint of wetting and spreading properties, the component (d) is preferably an aliphatic diol having 2 to 6 carbon atoms (d3), more preferably one or more selected from ethylene glycol and propylene glycol.

[0050] When the disinfectant composition for hard surfaces of the present invention contains component (d), it contains, from the viewpoint of wetting and spreading property, preferably 0.01% by mass or more of component (d), 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 2% by mass or less, even more preferably 1% by mass or less.

[0051] In order to increase the added value of the product, the disinfectant composition for hard surfaces of the present invention may optionally contain fragrances, colorants, preservatives, antioxidants, pH adjusters, etc. (excluding the above components (a) to (d)).

[0052] The disinfectant composition for hard surfaces of the present invention can contain water. That is, the balance other than the components (a) to (d) and optional components is water. The disinfectant composition for hard surfaces of the present invention contains water in an amount of preferably 95% by mass or more, more preferably 98% by mass or more, even more preferably 99% by mass or more, and preferably 99.9% by mass or less, more preferably 99.8% by mass or less, even more preferably 99.7% by mass or less. It is preferable to use ion-exchanged water, sterilized ion-exchanged water, etc. as the water.

[0053] The disinfectant composition for hard surfaces of the present invention is a disinfectant composition for hard surfaces that does not require a strong acid. That is, the disinfectant composition for hard surfaces of the present invention can obtain a good disinfecting effect even if the liquid is weakly acidic to near neutral. The disinfectant composition for hard surfaces of the present invention has a pH of 4.0 or more and 9.0 or less, preferably 8.0 or less, more preferably 7.0 or less at 20°C, from the viewpoint of ease of handling and irritation to the skin of the hands. A pH adjuster can be used to adjust the pH. As the pH adjuster, an inorganic acid such as hydrochloric acid or sulfuric acid, or an acid agent such as an organic acid can be used. In addition, as the alkaline agent, sodium hydroxide, potassium hydroxide, sodium carbonate, or potassium carbonate can be used.

[0054] The hard surfaces targeted by the disinfectant composition for hard surfaces of the present invention include fixed objects such as floors, stairs, and walls made of plastic, rubber, metal, tile, brick, concrete, cement, glass, wood, etc., as well as hard surfaces of various instruments, utensils, tools, furniture, tableware, etc. made of these that people come into contact with. For example, it can be applied to hard surfaces present in toilets, baths, washstands, kitchens, living rooms, etc. The disinfectant composition for hard surfaces of the present invention can be used as a disinfectant for around the kitchen, a disinfectant for the bathroom, a disinfectant for floors, a disinfectant for tableware, a disinfectant for small items in the kitchen, washroom, and living room, etc.

[0055] [Hard surface treatment method] The method for treating a hard surface of the present invention is a method for treating a hard surface, which comprises contacting the disinfectant composition for hard surfaces of the present invention with a hard surface on which bacteria are present. In the present invention, the disinfectant composition for hard surfaces of the present invention is used by contacting the hard surface with the surface by spraying, coating, immersion or the like. The hard surface treatment method of the present invention includes (1) a method of spraying the disinfectant composition for hard surfaces of the present invention or a diluted composition obtained by diluting the composition with water onto a hard surface using a sprayer such as a trigger, (2) a method of impregnating a cleaning item made of a water-absorbent flexible material with the disinfectant composition for hard surfaces of the present invention or a diluted composition obtained by diluting the composition with water and rubbing the hard surface, and (3) a method of immersing an object in the disinfectant composition for hard surfaces of the present invention or a diluted composition obtained by diluting the composition with water, of which method (2) is preferred from the viewpoint of simplicity.

[0056] The hard surface treatment method of the present invention is preferably a hard surface treatment method in which the disinfectant composition for hard surfaces of the present invention is contacted with a hard surface, or the composition is contacted with a hard surface in its original form without dilution, that is, the composition is contacted with a hard surface without dilution.Furthermore, the hard surface treatment method is preferably a hard surface treatment method in which the composition is contacted with a hard surface on which bacteria are attached without dilution. The term "contacting the disinfectant composition for hard surfaces without dilution" refers to not contacting the composition with a hard surface after intentionally diluting it with water, etc. For example, when the composition is contacted with a hard surface on which water droplets, etc. are attached, or when water droplets are attached to the hard surface after the composition is contacted with the hard surface, it can be understood that the composition is contacted with the hard surface without dilution. In the method for treating a hard surface of the present invention, the composition may be directly applied or sprayed from a bottle in an undiluted form to bring the composition into contact with a hard surface. Examples of the bottle include a squeeze bottle and a spray bottle. In addition, in the present invention, when using a cleaning article such as a nonwoven fabric or a dustcloth, the disinfectant composition for hard surfaces of the present invention may be sprayed or applied to the object to be cleaned or the cleaning article. This method of use allows a larger area to be cleaned.

[0057] Alternatively, a concentrated composition containing the components (a), (b), and optional components of the present invention may be prepared, and the concentrated composition may be diluted with water to prepare the disinfectant composition for hard surfaces of the present invention, which may then be brought into contact with a hard surface. That is, the method may be such that a concentrated composition containing the components (a), (b), and optional components of the present invention is diluted with water to prepare the disinfectant composition for hard surfaces of the present invention, and the composition is brought into contact with a hard surface without dilution.

[0058] From the viewpoint of sterilization and antibacterial effects, it is preferable to leave the composition on a hard surface on which bacteria are present after contacting the composition, without a step of rinsing with water or wiping the composition off the target surface, and leave the composition as it is / dry so that component (a), component (b), and optional component (c) remain on the hard surface. In this case, component (a) is preferably present at 0.1 μg / m 2 or more, preferably 10 μg / m 2 More preferably, 100 μg / m 2 More preferably, 500 μg / m 2 More preferably, 1,000 μg / m 2 and above 100,000 μg / m 2 Less than or equal to 50,000 μg / m 2 Less than or equal to 10,000 μg / m 2 Less than 8,000 μg / m 2 It is preferable to leave it on the target surface in the following proportions from the viewpoint of sterilization and antibacterial properties.

[0059] [Method for improving the wetting and spreading properties of a disinfectant composition for hard surfaces] The present invention relates to a method for improving the wetting and spreading properties of a disinfectant composition for hard surfaces, the method comprising mixing a disinfectant composition for hard surfaces, the disinfectant composition containing component (a) and having a pH of 4.0 or more and 9.0 or less, with component (b) such that the mass ratio (a) / (b) of the amount of component (a) mixed to the amount of component (b) mixed is 0.01 or more and 15 or less. The disinfectant composition for hard surfaces preferably further contains component (c) from the viewpoints of antibacterial effect and wettability / spreadability. That is, the present invention relates to a method for improving wettability / spreadability of a disinfectant composition for hard surfaces, which contains components (a) and (c) and has a pH of 4.0 to 9.0, and further includes mixing component (b) such that the mass ratio (a) / (b) of the amount of component (a) mixed to the amount of component (b) mixed is 0.01 to 15. In the method for improving the wetting and spreading properties of the disinfectant composition for hard surfaces of the present invention, the components (a), (b), and (c) are the same as those described in the disinfectant composition for hard surfaces of the present invention. In the method for improving the wetting and spreading properties of the disinfectant composition for hard surfaces of the present invention, the component (d) and optional components described in the disinfectant composition for hard surfaces of the present invention may be mixed into the disinfectant composition for hard surfaces. The method for improving the wetting and spreading property of the disinfectant composition for hard surfaces of the present invention can be appropriately applied to the embodiments described for the disinfectant composition for hard surfaces of the present invention. The method for improving the wetting and spreading properties of the disinfectant composition for hard surfaces of the present invention can be appropriately applied by replacing the contents of each component described in the disinfectant composition for hard surfaces of the present invention with the mixed amounts.

[0060] In the method for improving the wettability and spreadability of a disinfectant composition for hard surfaces of the present invention, a disinfectant composition for hard surfaces containing component (a) is mixed with component (b) so that, from the viewpoint of wettability and spreadability, the mass ratio (a) / (b) of the amount of component (a) mixed to the amount of component (b) mixed is 0.01 or more, preferably 0.1 or more, more preferably 0.3 or more, and 15 or less, preferably 5 or less, more preferably 3 or less, even more preferably 2 or less, and even more preferably 1 or less. However, the amount of component (a) mixed is the amount of component (a) mixed when the anion of component (a) is converted into that of a chloride ion.

[0061] In the method for improving the wetting and spreading property of a disinfectant composition for hard surfaces of the present invention, when the disinfectant composition for hard surfaces contains component (c), component (b) is mixed into a disinfectant composition for hard surfaces containing components (a) and (c) from the viewpoints of wetting and spreading property and disinfecting property and / or antibacterial property, such that the mass ratio (c) / (b) of the amount of component (c) mixed to the amount of component (b) mixed is preferably 0.5 or more, more preferably 1 or more, even more preferably 3 or more, still more preferably 4 or more, and preferably 100 or less, more preferably 50 or less, still more preferably 25 or less, and still more preferably 10 or less. However, the amount of component (c) mixed is the amount of component (c) converted into an acid form.

[0062] In the method for improving the wettability and spreadability of the disinfectant composition for hard surfaces of the present invention, the disinfectant composition for hard surfaces containing the component (a) is mixed with the component (b) so that the total mixed amount of the components (a) and (b) is preferably 0.011% by mass or more, more preferably 0.05% by mass or more, even more preferably 0.1% by mass or more, and even more preferably 0.15% by mass or more from the viewpoint of disinfection, and is preferably 1.5% by mass or less, more preferably 0.5% by mass or less, even more preferably 0.2% by mass or less, and even more preferably 0.15% by mass or less from the viewpoint of mildness to the hand skin. However, the mixed amount of the component (a) is the content of the anionic group of the component (a) converted into that of a chloride ion.

[0063] In the method for improving the wettability and spreadability of a disinfectant composition for hard surfaces of the present invention, component (b) is mixed into a disinfectant composition for hard surfaces containing component (a) so that the mixed amount of all surfactants is preferably 0.01 mass% or more, more preferably 0.03 mass% or more, and even more preferably 0.05 mass% or more from the viewpoint of improving wettability and spreadability, and is preferably 1.0 mass% or less, more preferably 0.5 mass% or less, and even more preferably 0.2 mass% or less from the viewpoint of mildness to hand skin. EXAMPLES

[0064] The disinfectant compositions for hard surfaces shown in Tables 1 to 3 were prepared using the following blended components, and the following items were evaluated. The results are shown in Tables 1 to 3. The disinfectant compositions for hard surfaces shown in Tables 1 to 3 were prepared by adding components (a) to (d) in the blended amounts shown in the tables to ion-exchanged water and dissolving them at room temperature (20°C). After blending, the pH was adjusted to the values ​​shown in Tables 1 to 3 using 1N aqueous sodium hydroxide solution and / or 0.1N aqueous sulfuric acid solution as a pH adjuster. The pH was measured by a glass electrode method. The mass % of the blended components in Tables 1 to 3 are all values ​​based on the active components.

[0065] <Composition ingredients> (a) Ingredients C12 benzalkonium chloride: Sanisol C, manufactured by Kao Corporation; in general formula (a1), R 1a R is a mixed alkyl group with carbon numbers of 12 / 14 / 16 mixed in a molar ratio of 58 / 35 / 7. 2a , R 3a is a methyl group, R 4a is a methylene group, Z - Compounds where is chloride ion C8 Benzalkonium chloride: Sanizol 08, manufactured by Kao Corporation; in general formula (a1), R 1a is an alkyl group having 8 carbon atoms, R 2a , R 3a is a methyl group, R 4a is a methylene group, Z - Compounds where is chloride ion

[0066] (b) Component C12 amidopropyl betaine: Amphitol 20AB, manufactured by Kao Corporation; in general formula (b2), R 4b is an alkyl group having 11 carbon atoms, R 5b is a propylene group, R 6b and R 7b Compounds with methyl groups Alkyl glycoside: AG-124, manufactured by Kao Corporation. In the general formula (b3), R 8b is a linear alkyl group having 10 to 16 carbon atoms, x is 0, G is a group derived from glucose, and the condensation degree y of glucose is an average value of 1.3 C12 amidopropylamine oxide: Softazoline LAO(W), manufactured by Kawaken Fine Chemicals Co., Ltd. In the general formula (b1), R 1b is an alkyl group having 11 carbon atoms, D is a -C(=O)NH- group, E is a propylene group, R 2b and R 3b Compounds with methyl groups

[0067] Component (b') (comparison component of component (b)) C12 amine oxide: Amphitol 20N, manufactured by Kao Corporation, N-lauryl-N,N-dimethylamine oxide

[0068] (c) Component Lactic acid: Corbion Japan Co., Ltd. Citric acid: Wako Pure Chemical Industries, Ltd. Malic acid: Kishida Chemical Co., Ltd.

[0069] (d) Ingredients Propylene glycol: AGC Co., Ltd. -Butyl diglycol: Nippon Nyukazai Co., Ltd. Ethanol: Wako Pure Chemical Industries, Ltd.

[0070] <Method for evaluating sterilization performance> E. coli (NBRC3972) was cultured on SCDLP agar medium for one day, and then cultured in SCDLP liquid medium for one day with shaking. After that, it was suspended in saline and incubated for 10 8 ~10 9 The bacterial concentration was adjusted to CFU / mL, and the test bacterial solution was prepared by mixing an equal amount of this with a 3% BSA aqueous solution. 100 μL of the disinfectant composition for hard surfaces shown in Tables 1 to 3 was inoculated with 10 μL of the test bacteria liquid and allowed to come into contact with the bacteria at 25° C. for 5 minutes, after which 10 mL of SCDLP liquid medium was added for inactivation. An appropriate amount of SCDLP agar medium was poured into 1 mL of this inactivation liquid, solidified, and the number of bacteria after 24 hours of culture at 37°C was counted. In addition, the same procedure was carried out using ion-exchanged water instead of the hard surface disinfectant composition in Tables 1 to 3 (10 μL of test bacteria liquid was inoculated into 100 μL of water, contacted for 5 minutes, and then inactivated by adding 10 mL of SCDLP liquid medium), and the number of live bacteria in blank (water) was counted, and the disinfection activity value was calculated from the following formula. The higher the disinfection activity value, the more excellent the disinfection performance. The results are shown in Tables 1 to 3. * Disinfection activity value = Log (number of live bacteria in blank (water)) - Log (number of live bacteria in test liquid)

[0071] <Antibacterial performance evaluation> E. coli (NBRC3972) was cultured on SCDLP agar medium for one day, and then cultured in SCDLP liquid medium for one day with shaking. After that, it was suspended in physiological saline and incubated for 10 8 ~10 9 The bacterial concentration was adjusted to CFU / mL. This was diluted with 1 / 100 normal bouillon liquid medium and 10 6 ~10 7 A bacterial solution containing CFU / mL of bacteria was prepared and mixed with an equal amount of 0.6% BSA aqueous solution to prepare a test bacterial solution. 500 μL of the disinfectant composition for hard surfaces shown in Tables 2 and 3 was dropped onto a polystyrene petri dish (diameter 9 cm), wiped with paper, and dried. At this time, the total residual amount of component (a) and component (b) in the petri dish was 0.0045 g / m 2 It was adjusted to be more than that. 100μL of the test bacteria liquid was dropped onto the plate, which was then covered with a 4 x 4cm polyethylene film and left to stand for 24 hours under conditions of humidity of 90% or higher and 37℃. After standing, the bacteria were extracted using 10 mL of SCDLP liquid medium, and an appropriate amount of SCDLP agar medium was poured into 1 mL of this inactivation liquid and solidified, and the number of bacteria after 24 hours of culture at 37 ° C was counted. In addition, the same operation was performed using ion-exchanged water instead of the hard surface disinfectant composition in Tables 2 and 3 (500 μL of water was dropped into a petri dish, then 100 μL of test bacteria liquid was dropped, and the mixture was left to stand for 24 hours under conditions of humidity 90% or more and 37 ° C, after which the bacteria were extracted and cultured for 24 hours at 37 ° C) and counted as the number of live bacteria in blank (water), and the antibacterial activity value was calculated from the following formula. The higher the antibacterial activity value, the better the antibacterial performance. The results are shown in Tables 2 and 3. *Antibacterial activity value = Log (number of live bacteria on blank (water) substrate after 24 hours) - Log (number of live bacteria on substrate coated with test liquid after 24 hours)

[0072] <Finishing quality (hard surface wettability)> The wettability of 0.75 mL of the disinfectant composition for hard surfaces shown in Tables 1 to 3 when spread on a hard surface using a Kimwipe was evaluated according to the following criteria. The hard surface materials used were glass, stainless steel, and wood, and the total results are shown in Tables 1 to 3. In this evaluation, a score of 3 or more is acceptable; a score of 3 or more indicates that there are few water-repellent areas on the hard surface, so that component (a) spreads uniformly on the target object, and a high disinfecting and antibacterial effect is obtained. 2: Gets wet all over 1: Some areas are water-repellent, but they still get wet 0: Liquid bounces off the surface

[0073] <Mild on hands> The disinfectant compositions for hard surfaces shown in Tables 1 to 3 were dropped onto the skin of the hands, and the irritation caused when the compositions were attached to the skin of the hands was evaluated according to the following criteria. The total results of five testers (two men and three women) are shown in Tables 1 to 3. In this evaluation, a score of 5 or more is considered to be a pass. 2: I don't feel anything 1: Feels slightly irritated 0: Feels irritated

[0074] [Table 1]

[0075]

Table 2

[0076]

Table 3

Claims

1. (a) a quaternary ammonium salt type cationic surfactant [hereinafter referred to as component (a)] in an amount of 0.0001% by mass or more and 1.0% by mass or less, (b) one or more surfactants selected from an amidoalkylamine oxide type surfactant, a betaine type surfactant, and an alkylglycoside type surfactant [hereinafter referred to as component (b)], and (c) one or more surfactants selected from lactic acid, citric acid, malic acid, glycolic acid, glutaric acid, oxalic acid, malonic acid, succinic acid, adipic acid, maleic acid, and salts thereof. a mass ratio (a) / (b) of the content of the component (a) to the content of the component (b) being 0.3 or more and 5 or less, a mass ratio (c) / (b) of the content of the component (c) to the content of the component (b) being 3 or more and 10 or less, and a pH at 20°C being 4.0 or more and 9.0 or less, said mass ratio (a) / (b) of the content of the component (c) to the content of the component (b) being 4.0 or more and 9.0 or less, is brought into contact with a hard surface on which bacteria are present, and after the contact, the surface is allowed to stand or dried without a rinsing step.

2. The method for treating a hard surface according to claim 1, wherein the disinfectant composition for hard surfaces contains component (b) in an amount of 0.01% by mass or more and 0.5% by mass or less.

3. The method for treating a hard surface according to claim 1 or 2, wherein the total surfactant content in the disinfectant composition for hard surfaces is 0.01% by mass or more and 1.0% by mass or less.

4. The method for treating a hard surface according to any one of claims 1 to 3, wherein the disinfectant composition for hard surfaces further contains (d) a volatile organic solvent (hereinafter referred to as component (d)).

5. The method for treating a hard surface according to claim 4, wherein the disinfectant composition for hard surfaces contains 0.01% by mass or more and 5% by mass or less of the component (d).

6. A method for improving the wettability and spreadability of a disinfectant composition for hard surfaces, comprising: (a) a quaternary ammonium salt-type cationic surfactant [hereinafter referred to as component (a)]; and (c) one or more organic acids or salts thereof selected from lactic acid, citric acid, malic acid, glycolic acid, glutaric acid, oxalic acid, malonic acid, succinic acid, adipic acid, maleic acid, and salts thereof [hereinafter referred to as component (c)], and having a pH of 4.0 to 9.0, comprising mixing (b) one or more surfactants selected from amidoalkylamine oxide-type surfactants, betaine-type surfactants, and alkylglycoside-type surfactants [hereinafter referred to as component (b)] such that the mass ratio (a) / (b) of the amount of the mixed component (a) to the amount of the mixed component (b) is 0.3 to 5 and the mass ratio (c) / (b) of the amount of the mixed component (c) to the amount of the mixed component (b) is 3 to 10.

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