Sterilization method

Abstract

To provide a sterilization method that delivers superior sterilization performance while enabling the decolorization of stains from microorganisms on textile products or hard surfaces, as well as a treatment solution for that purpose.SOLUTION: A sterilization method employs a treatment solution that contains the following components (a)-(c). Component (a): an anionic surfactant, component (b): a nonionic surfactant, and component (c): hydroxycarboxylic acid. Here, (i) the mass ratio of component (a) to component (b), (a) / (b), is 0.60 or more and less than 2.0, (ii) the content of component (c) is 35 ppm or more, and (iii) the pH at 25°C is 2 or more and 6 or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a sterilization method. [Background technology]

[0002] In recent years, as consumers have become more conscious of hygiene, there is a demand for cleaning textile products and hard surfaces that are effective against bacteria and stains derived from bacteria. Escherichia coli is used as one of the criteria for evaluating bactericidal and disinfecting effects, but it is generally known that it is difficult to disinfect and disinfect E. coli with detergents that mainly contain surfactants. If bacteria, including E. coli, can be disinfected and disinfected when cleaning textile products and hard surfaces, it is thought that a more hygienic environment for food, clothing, and housing can be provided to consumers. In addition, visible stains derived from bacteria can occur on textile products and hard surfaces where bacteria have proliferated, and by removing stains derived from bacteria in addition to disinfecting and disinfecting, it is possible to further improve consumers' sense of hygiene.

[0003] Patent Document 1 discloses that a liquid detergent composition for clothing contains component (A): a nonionic surfactant, component (B): 2.5 mass% or more of an anionic surfactant, and component (C): 5 mass% or more of an organic carboxylic acid, the sum of the contents of components (A) and (B) being 12 mass% or more relative to the total mass of the liquid detergent composition for clothing, the mass ratio represented by component (B) / component (A) being 0.05 to 0.5, and the pH at 25°C being less than 7, thereby providing a detergent that can reduce the urine odor adhering to clothing (has a high urine odor removing effect).

[0004] Patent Document 2 discloses an acidic laundry detergent composition comprising about 2% to 20% by weight of the detergent of anionic surfactants, nonionic surfactants, and combinations thereof, and more than 10% by weight of an organic acid, and having a biological content of more than 50%. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-099682 A [Patent Document 2] Special Publication No. 2022-505605 Summary of the Invention [Problem to be solved by the invention]

[0006] However, conventional sterilization techniques using anionic surfactants are insufficient in achieving both sterilization and removal of visible stains derived from bacteria.

[0007] The present invention relates to a sterilization method that has an excellent sterilizing effect and is also excellent in decolorizing bacteria-derived stains attached to textile products and hard surfaces. [Means for solving the problem]

[0008] The present invention relates to a treatment liquid containing the following components (a) to (c): Component (a): Anionic surfactant (b) Component: Nonionic surfactant (c) Component: Hydroxycarboxylic acid Where: (i) the mass ratio of component (a) to component (b), (a) / (b), is 0.60 or more and less than 2.0; (ii) (c) contains 35 ppm or more of the component; (iii) a pH of 2 or more and 6 or less at 25°C; That is, The present invention relates to a sterilization method using the above-mentioned method.

[0009] The present invention also provides a composition comprising the following components (a) to (c): Component (a): Anionic surfactant (b) Component: Nonionic surfactant (c) Component: Hydroxycarboxylic acid Where: (i) the mass ratio of component (a) to component (b), (a) / (b), is 0.60 or more and less than 2.0; (ii) (c) contains 35 ppm or more of the component; (iii) a pH of 2 or more and 6 or less at 25°C; The present invention relates to a treatment liquid for sterilization, Effect of the Invention

[0010] According to the present invention, there is provided a sterilization method and a treatment liquid for said purpose, which have excellent sterilization performance and excellent decolorization of bacterial stains attached to textile products and hard surfaces. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] First, sterilization in the present invention will be described. "Sterilization" means "killing or destroying bacteria" and refers to the reduction in the number of live bacteria on objects such as fiber surfaces or hard surfaces, or in treatment solutions. In this application, the reduction in the number of live bacteria on objects by measurement is called "sterilization", the effect is called the "sterilization effect", and the activity is called the "sterilization activity".

[0012] Next, the processing solution used in the method of the present invention will be described. The treatment liquid used in the method of the present application may contain one or more anionic surfactants as component (a). Specifically, from the viewpoint of sterilization performance and decolorization ability of bacteria-derived dirt, the surfactant may be one or more selected from alkyl sulfate esters, alkenyl sulfate esters, polyoxyalkylene alkyl ether sulfate esters, polyoxyalkylene alkenyl ether sulfate esters, alkyl benzene sulfonic acids, alkenyl benzene sulfonic acids, alkanesulfonic acids, α-olefin sulfonic acids, internal olefin sulfonic acids, alkyl or dialkyl sulfosuccinic acids, alkenyl or dialkenyl sulfosuccinic acids, polyoxyalkylene alkyl or polyoxyalkylene dialkyl sulfosuccinic acids, polyoxyalkylene alkyl or polyoxyalkylene dialkyl sulfosuccinic acids, alkyl succinic acids, alkenyl succinic acids, fatty acids, and salts thereof.

[0013] Among these, alkylbenzene sulfonic acid is preferred from the viewpoint of bactericidal performance and decolorizing ability of bacteria-derived stains.

[0014] From the viewpoints of bactericidal performance and decolorizing ability of bacterial stains, the anionic surfactant of component (a) is preferably an alkali metal salt such as sodium or potassium; an alkaline earth metal salt such as magnesium; an ammonium salt; or an alkanol ammonium salt such as monoethanol ammonium or diethanol ammonium, with sodium salts being more preferred.

[0015] The anionic surfactant of component (a) may be used as a salt, but may also be used as an acid.

[0016] The content of the anionic surfactant of component (a) in the treatment solution is preferably 1 ppm or more, more preferably 10 ppm or more, and even more preferably 50 ppm or more, from the viewpoints of bactericidal performance and decolorization ability of bacterial stains, and is preferably 150,000 ppm or less, and more preferably 80,000 ppm or less.

[0017] The treatment liquid used in the method of the present application contains one or more kinds of nonionic surfactants as component (b). Specifically, from the viewpoint of sterilizing performance and decolorizing ability of bacteria-derived stains, examples of such surfactants include polyethylene glycol-type nonionic surfactants such as aliphatic alcohol alkoxylates, aliphatic ester alkoxylates, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene alkylphenyl ethers, and polyoxyalkylene (hydrogenated) castor oil, polyhydric alcohol-type nonionic surfactants such as sucrose fatty acid esters, polyglycerin alkyl ethers, polyglycerin fatty acid esters, and alkyl glycosides, and fatty acid alkanolamides.

[0018] From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, the component (b) is preferably one or more nonionic surfactants selected from aliphatic alcohol alkoxylates and aliphatic ester alkoxylates represented by the following general formula (1). R 1b -(CO) m O-(AO) n -R 2b (1) [In the formula, R 1b is an aliphatic hydrocarbon group having 9 to 18 carbon atoms, R 2b is a hydrogen atom or a methyl group, CO is a carbonyl group, m is a number of 0 or 1, and AO is one or more alkyleneoxy groups selected from an alkyleneoxy group having 2 carbon atoms and an alkyleneoxy group having 3 carbon atoms. When AO contains an ethyleneoxy group and a propyleneoxy group, the ethyleneoxy group and the propyleneoxy group may be bonded in a block type or random type. n is the average number of moles added and is a number of 1 to 70.

[0019] As specific examples of the aliphatic alcohol alkoxylate, compounds represented by the following formulae (1a) to (1c) are preferred from the viewpoints of bactericidal performance and decolorizing ability of bacteria-derived stains. R 1b -O-(C2H4O) n -H(1a) [In the formula, R 1b and n have the same meaning as above. R 1b -O-(C2H4O) n1 / (C3H6O) m1 -H(1b) [In the formula, R 1b has the same meaning as above. n1 and m1 are each independently 1 or more and less than 40, and n1+m1 is 2 or more and less than 60. (C2H4O) and (C3H6O) may be a random or block adduct. R 1b -O-(C2H4O) n1 -(C3H6O) m1 -(C2H4O) n2 -H(1c) [In the formula, R 1bhas the same meaning as above. n1, m1, and n2 are the average number of moles added, n1 is 1 or more and 20 or less, m1 is 1 or more and 20 or less, n2 is 1 or more and 20 or less, and n1+m1+n2 is 2 or more and less than 60. (C2H4O), (C3H6O), and (C2H4O) are block adducts.]

[0020] A specific example of the aliphatic ester alkoxylate is fatty acid methyl ester ethoxylate (fatty acid having 16 to 18 carbon atoms, average added mole number of ethyleneoxy groups being 15 moles) from the viewpoint of bactericidal performance and decolorization ability of bacterial stains.

[0021] From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, the nonionic surfactant of component (b) is preferably 1 ppm or more, more preferably 10 ppm or more, even more preferably 50 ppm or more, and is preferably 80,000 ppm or less, more preferably 50,000 ppm or less.

[0022] From the viewpoints of bactericidal performance and decolorization ability of bacterial stains, the mass ratio (a) / (b) of the (a) component to the (b) component is preferably 0.60 or more, more preferably 0.70 or more, even more preferably 0.80 or more, and is preferably less than 2.0, more preferably 1.9 or less, and even more preferably 1.8 or less.

[0023] (c) As the hydroxycarboxylic acid component, from the viewpoints of bactericidal performance and the ability to decolorize stains derived from bacteria, specifically, monocarboxylic acids such as glycolic acid, lactic acid, glyceric acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid, 4-dihydroxybutyric acid, mevalonic acid, pantothenic acid, quinic acid, shikimic acid and their optical isomers; polycarboxylic acids such as citric acid, malic acid, tartaric acid, 2-hydroxycitric acid, 2-methylcitric acid, isocitric acid, 2-hydroxyglutaric acid, citramalic acid, tartronic acid, 2-methyltartronic acid, hydroxymaleic acid, hydroxymaleic acid, hydroxymethanetetracarboxylic acid, aldic acid and their optical isomers; can be exemplified. Further, hydrates thereof can be used. Furthermore, when these hydroxycarboxylic acids have optical isomers, each optical isomer may be used alone or a racemate may be used. From the viewpoints of bactericidal performance and the ability to decolorize stains derived from bacteria, it is preferably at least one selected from citric acid, lactic acid, oxalic acid, and malic acid, and more preferably at least one selected from citric acid and lactic acid. From the viewpoints of bactericidal performance and the ability to decolorize stains derived from bacteria, it is preferable to use two or more kinds, and it is more preferable to use citric acid and lactic acid in combination.

[0024] (c) The hydroxycarboxylic acid component is preferably 35 ppm or more, more preferably 37 ppm or more, still more preferably 40 ppm or more, and preferably 150000 ppm or less, more preferably 80000 ppm or less from the viewpoints of bactericidal performance and the ability to decolorize stains derived from bacteria.

[0025] In addition to the components (a) to (c), the treatment liquid of the present application may contain an appropriate amount of one or more of the following optional components.

[0026] <pH adjuster> From the viewpoints of bactericidal performance and the ability to decolorize stains derived from bacteria, the pH adjuster can contain one or more alkalis. Specifically, inorganic salts such as alkali metal hydroxides and alkali metal carbonates, and alkanolamines in which one or more and three or less groups bonded to nitrogen atoms are alkanol groups having from 2 to 4 carbon atoms, and the remainder are alkyl groups or hydrogen atoms having from 1 to 4 carbon atoms, can be used. From the viewpoints of bactericidal performance and decolorizing ability of bacterial stains, sodium hydroxide and monoethanolamine are preferred.

[0027] <Organic solvent> The treatment liquid of the present application may contain an organic solvent having a hydroxyl group from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. Specifically, the treatment liquid may contain an organic solvent having a hydroxyl group, such as a monohydric alcohol having an aliphatic hydrocarbon group having 2 to 6 carbon atoms selected from ethanol, propanol, 2-propanol, butanol, etc.; a dihydric to hexahydric alcohol having 2 to 6 carbon atoms selected from ethylene glycol, propylene glycol, butylene glycol, 2-methyl-2,4-pentanediol, 1,5-pentanediol, 1,6-hexanediol, glycerin, etc.; a polyalkylene glycol containing an alkylene glycol unit having 2 to 4 carbon atoms selected from polyalkylene glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, polyethylene glycol having a weight average molecular weight of 400 to 4000, and polypropylene glycol having a weight average molecular weight of 400 to 4000; diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, di ... monoalkyl ethers of (mono- or poly)alkylene glycols having an alkylene glycol unit having from 2 to 4 carbon atoms and an alkyl group having from 1 to 4 carbon atoms, selected from glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, tripropylene glycol monomethyl ether, diethylene glycol monobutyl ether, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, and the like; alkyl glyceryl ethers having an alkyl group having from 1 to 8 carbon atoms, selected from 1-methyl glyceryl ether, 2-methyl glyceryl ether, 1,3-dimethyl glyceryl ether, 1-ethyl glyceryl ether, 1,3-diethyl glyceryl ether, triethyl glyceryl ether, 1-pentyl glyceryl ether, 2-pentyl glyceryl ether, 1-octyl glyceryl ether, 2-ethylhexyl glyceryl ether, and the like;Examples of the alkyl ether include aromatic alkyl ethers of (mono- or poly-)alkylene glycols having an alkylene glycol unit having 2 or 3 carbon atoms selected from 2-phenoxyethanol, diethylene glycol monophenyl ether, triethylene glycol monophenyl ether, polyethylene glycol monophenyl ether having an average molecular weight of about 480, 2-benzyloxyethanol, and diethylene glycol monobenzyl ether.

[0028] <Thixotropic agent> As the thixotropy-imparting agent, from the viewpoint of bactericidal performance and decolorization ability of bacterial stains, crystalline fatty acid glycerides can be mentioned. Regarding fatty acid glycerides, crystalline means that they have the property of exhibiting an endothermic peak when heated from 30°C in differential scanning calorimetry. From the viewpoint of bactericidal performance and decolorizing ability of bacterial stains, the fatty acid glyceride is preferably a crystalline fatty acid glyceride having a hydroxyl group in the fatty acyl group, and more preferably a crystalline fatty acid glyceride having a fatty acyl group having 14 to 18 carbon atoms in which one or more hydrogen atoms are replaced with a hydroxyl group. The presence of a hydroxyl group in the fatty acyl group promotes crystal growth of the fatty acid glyceride due to intermolecular hydrogen bonds between fatty acid glycerides. In addition, the fatty acid glyceride can have a maximum of 3 fatty acyl groups. The average number of acyl groups in all fatty acid glycerides is 1 or more, preferably 2 or more, more preferably 2.5 or more, and even more preferably 3 or more, from the viewpoints of bactericidal performance and decolorization ability of bacterial stains. In addition, the iodine value of the fatty acid glyceride is preferably 5 g-I2 / 100 g or less, more preferably 4 or less, even more preferably 3 or less, and even more preferably 2 or less, from the viewpoint of bactericidal performance and decolorization ability of bacterial stains. The iodine value can be determined according to the method described in JIS K 0070:1992 (Testing methods for acid value, saponification value, ester value, iodine value, hydroxyl value and unsaponifiable matter of chemical products). As a specific example of the fatty acid glyceride, from the viewpoint of bactericidal performance and decolorizing ability of bacterial stains, hardened castor oil or hydrogenated castor oil is preferred.

[0029] <Preservatives> The treatment liquid of the present application may contain a preservative from the viewpoint of the bactericidal performance and the ability to decolorize stains derived from bacteria. Specific examples of the preservative include one or more selected from isothiazolones, triazines, bronopol, thiabendazole, zinc pyrithione, carbendazim, benzoic acid, sodium benzoate, ε-polylysine, protamine, sorbic acid, sodium sorbate, potassium sorbate, sodium dehydroacetate, propionic acid, sodium propionate, paraoxybenzoic acid esters, hinokitiol, alkyl paraoxybenzoates, and benzyl paraoxybenzoate.

[0030] <Antibacterial agent> The treatment liquid of the present application may contain an antibacterial agent from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. Specific examples of the antibacterial agent include one or more selected from benzyl alcohol, phenoxyethanol, 2-phenylethanol, 3-phenyl-1-propanol, benzyl glycol, phenyl diglycol, benzyl diglycol, 4-phenyl-1-butanol, triclosan, diclosan, and isopropyl methylphenol.

[0031] <Antifoaming agent> The treatment liquid of the present application may contain an antifoaming agent from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. Specific examples of the antifoaming agent include one or more types selected from silicone-based antifoaming agents, fatty acid ester-based antifoaming agents, ether-based antifoaming agents, polyalkylene oxide-based antifoaming agents, alkyl phosphate ester-based antifoaming agents, and acetylene glycol-based antifoaming agents.

[0032] <Fluorescent whitening agent> The treatment solution of the present application may contain a fluorescent whitening agent from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains.Specific examples of the fluorescent whitening agent include one or more selected from esculin, diaminostilbene disulfonic acid, bis(sulfostyryl)biphenyl salt, bis(triazinylamide)stilbene disulfonic acid, umbelliferone, coumarin derivatives, pyrazoline derivatives, and rhodamine derivatives.Specific examples of the fluorescent dye include fluorescent dyes commercially available as Tinopal CBS (manufactured by Ciba Specialty Chemicals) and Whitex SA (manufactured by Sumitomo Chemical Co., Ltd.).

[0033] <Dye> The treatment solution of the present application may contain a dye from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. Specifically, the dye may be a dye used as a dye such as azoic dye, azo dye, acridine, aniline dye, indanthrene, eosin, Congo red, dihydrointhol, methylene blue, phenazine derivative dye, phenolphthalein, fuchsine, fluorescein, para red, mauve, etc., or a dye such as carotenoid, flavonoid, melanin, porphyrin dye, phycobilin dye, alizarin, anthocyanin, anthraquinone, indigo, urobilin, erythrocyan ... Examples of natural pigments include luminin, carthamin, xanthomatin, curcumin, crocetin, chlorin, chlorocruorin, genistein, cochineal, gossypol, imamelinin, shikonin, stercopilin, tannin, thurasin, bixin, hypericin, pinaglobin, brazilin, purpurin, betacyanin, berberine, phorbilin, mangosteen, moringin, laminaran, leghemoglobin, litmus, rhodopsin, rhodoxanthin, and rhodomatin.

[0034] <Fragrance> The treatment solution of the present application may contain a fragrance from the viewpoint of the sterilizing performance and the decolorizing ability of bacteria-derived stains. Specifically, cis-3-hexenol, 1-(2,2,6-trimethylcyclohexyl)-3-hexanol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol (trade name: Sandal Mysore Core, Kao Corporation), a mixture mainly composed of ethylnorbornylcyclohexanol (trade name: Magnol, Kao Corporation), 4-methyl-3-decen-5-ol (trade name: Undecavertol, Givaudan Corporation), isobornylcyclohexanol, 1-(2-tert-butylcyclohexyloxy)-2-butanol (trade name: Benzyl) (Kao Corporation), amber core), 1-(2,2,6-trimethylcyclohexyl)-3-hexanol and other alcohols, linalool, citronellol, geraniol, nerol, terpineol, α-terpineol, dihydromyrcenol, farnesol, nerolidol, cedrol, menthol, borneol, tetrahydrolinalool and other terpene alcohols, phenylethyl alcohol, benzyl alcohol, dimethylbenzyl carbinol, phenylethyl dimethyl carbinol, phenylhexanol and other aromatic alcohols, dipropylene glycol and other glycols, 4-methyl-2-(2-methylpropyl)tetrahydro-2H-4-pyranol (Givaudan trade name) Examples of the alcohol include other alcohols such as ethylhexyl ether (Florosa), terpenes such as limonene, α-pinene, β-pinene, and terpinene, sesquiterpenes such as cedrene, longifolene, and valencene, and phenols such as guaiacol, eugenol, dihydroeugenol, isoeugenol, thymol, para-cresol, vanillin, and ethyl vanillin. Other examples include acetate esters such as ethyl acetate, isopentyl acetate, hexyl acetate, cis-3-hexenyl acetate, linalyl acetate, citronellyl acetate, geranyl acetate, neryl acetate, terpinyl acetate, nopyr acetate, bornyl acetate, isobornyl acetate, eugenyl acetate, isoeugenyl acetate, o-tert-butylcyclohexyl acetate, p-tert-butylcyclohexyl acetate, tricyclodecenyl acetate, benzyl acetate, phenylethyl acetate, styrallyl acetate, cinnamyl acetate, dimethylbenzylcarbinyl acetate, phenylethylphenyl acetate, 3-pentyltetrahydropyran-4-yl acetate, and paracresylphenyl acetate. Other examples include carboxylates such as formic acid, propionic acid, and caproic acid corresponding to these acetate esters, and aromatic carboxylates such as benzoic acid, anisic acid, phenylacetic acid, cinnamic acid, salicylic acid, and anthranilic acid. In addition, ethyl dihydrocyclogeranate (Givaudan trade name: Ethyl Safranate), ethyl 2-cyclohexylpropionate (Kao Corporation trade name: Poirenate), tricyclo[5.2.1.0 2,6 ]Other carboxylic acid esters include ethyl decane-2-carboxylate (trade name: Fultate, Kao Corporation), methyl jasmonate, methyl dihydrojasmonate (trade name: MDJ, Kao Corporation), methyl (2-pentyl-3-oxocyclopentyl)acetate, allyl cyclohexyl propionate, allyl heptanoate, ethylene brassylate, ethylene dodecanediolate, ethyl 2-methylbutyrate, and ethyl 2-methylpentanoate. Other examples include carbonates such as cis-3-hexenyl methyl carbonate (IFF product name: Rifarome), methyl cyclooctyl carbonate (Kao Corporation product name: Jasmaclat), and ethyl 2-tert-butyl cyclohexyl carbonate (Kao Corporation product name: Floramat). In addition, octanal, nonanal, decanal, dodecanal, 2-methylundecanal, 10-undecenal, citronellal, citral, hydroxycitronellal, 2,4-dimethyl-3-cyclohexene-1-carboxaldehyde (IFF trade name: Tripral), dimethyl-3-cyclohexenyl-1-carboxaldehyde (Kao Corporation trade name: Cyclovertal), benzaldehyde, phenylacetaldehyde, phenylpropylaldehyde, cinnamaldehyde, dimethyltetrahydrobenzaldehyde, 3-(4-tert-butylphenyl)propanal (Givaudan trade name: Bourgeonal), hydroxymylac aldehyde (IFF trade name: Lyral), 2-cyclohexylpropanal (Kao Corporation trade name: Examples of aldehydes include Polenal II), p-tert-butyl-α-methylhydrocinnamic aldehyde (Givaudan trade name Lilial), p-isopropyl-α-methylhydrocinnamic aldehyde, 3-(o-(and p-)ethylphenyl)-2,2-dimethylpropionaldehyde (IFF trade name Floralozone), α-amylcinnamaldehyde, α-hexylcinnamaldehyde, heliotropin, α-methyl-1,3-benzodioxole-5-propanal (IFF trade name Helional), 2-methyl-3-(paramethoxyphenyl)propanal (IFF trade name Canthoxal), amylcinnamic aldehyde, helional, and [(3,7-dimethyl-6-octenyl)oxy]acetaldehyde. In addition, methylheptenone, dimethyloctenone, 3-octanone, hexylcyclopentanone, dihydrojasmone, 2,2,5-trimethyl-5-pentylcyclopentanone (Firmenich trade name: Beloutone), 2-[2-(4-methyl-3-cyclohexen-1-yl)propyl]cyclopentanone (Givaudan trade name: Nectaryl), ionone, β-ionone, β-methylionone, γ-methylionone, α-damascone, β-damascone, δ-damascone, 1-(2,4,4-trimethyl-2-cyclohexyl)-trans-2-butanone (Symrise trade name: Isodamascone), damascenone, 1-(5,5-dimethyl-1-cyclohexen-1-yl)-4-penten-1-one (Firmenich trade name: Dynacon), iron, 1,2,3,5,6,7-hexahydro-1,1,2,3,3-pentamethyl-4H-inden-4-one (IFF trade name Cashmeran), 1-(1,2,3,4,5,6,7,8-octahydro-2,3,8,8-tetramethyl-2-naphthalenyl)ethane-1-one (IFF trade name Iso-E-Super), 7-methyl-3,4-dihydro-2H-benzodioxepin-3-one (Firmenich trade name Calone), carvone, menthone, acetyl cedrene, isolongifolanon, nootkatone, benzyl acetone, raspberry ketone, benzophenone, 6-acetyl-1,1,2,4,4,7-hexamethyltetrahydronaphthalene (PFW trade name Examples of ketones include ketones such as tonalide, methyl β-naphthyl ketone, ethyl maltol, camphor, muscone, 3-methyl-5-cyclopentadecen-1-one (Muscenone, a product of Firmenich), civetone, 8-cyclohexadecenone (Globanone, a product of Symrise), methyl nonyl ketone, cis-jasmone, para-amylcyclohexanone (4-pentylcyclohexanone), and 6,7-dihydro-1,1,2,3,3-pentamethyl-4(5H)-indanone. Other examples include acetals such as acetaldehyde ethyl phenylpropyl acetal, citral diethyl acetal, phenylacetaldehyde glyceryl acetal, ethyl acetoacetate ethylene glycol acetal, 5-methyl-5-propyl-2-(1-methylbutyl)-1,3-dioxane (Kao Corporation product name Troenan), and α-methyl-3,4-methylenedioxyhydrocinnamic aldehyde. Other examples include ethers such as ethyl linalool, cedryl methyl ether, estragole, anethole, β-naphthyl methyl ether, β-naphthyl ethyl ether, limonene oxide, rose oxide, nerol oxide, 1,8-cineole, rose furan, [3aR-(3aα,5aβ,9aα,9bβ)]dodecahydro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan (Kao Corporation trade name Ambroxan), 3,3,5-trimethylcyclohexyl ethyl ether (Kao Corporation trade name Herbaveil), hexamethylhexahydrocyclopentabenzopyran (IFF Corporation trade name Galaxolide), phenylacetaldehyde dimethyl acetal, and ethoxymethylcyclododecyl ether (Kao Corporation trade name Boisanbrenforte). Further examples include carboxylic acids such as benzoic acid, phenylacetic acid, cinnamic acid, hydrocinnamic acid, butyric acid, and 2-hexenoic acid. Further examples include lactones such as ambrettolide, γ-decalactone, δ-decalactone, γ-valerolactone, γ-nonalactone, γ-undecalactone, δ-hexalactone, γ-jasmolactone, whiskey lactone, coumarin, cyclopentadecanolide, cyclohexadecanolide, 11-oxa-16-hexadecanolide (Givaudan trade name Musk R-1), and butylidenephthalide. Further examples include nitrogen-containing organic compounds such as tridecene-2-nitrile, geranyl nitrile, citronellyl nitrile, dodecane nitrile, and indole. The composition may also contain natural oils or natural extracts such as orange, lemon, lime, bergamot, vanilla, mandarin, peppermint, spearmint, lavender, chamomile, rosemary, eucalyptus, sage, basil, rose, rock rose, geranium, jasmine, ylang-ylang, anise, clove, ginger, nutmeg, cardamom, cedar, cypress, vetiver, patchouli, lemongrass, labdanum, grapefruit, and elemi oil.Fragrance mixtures such as Sim Amber (manufactured by SYMRISE) and Ultrasool (manufactured by GIVAUDAN) may also be used.

[0035] <Chelating agent> The treatment liquid of the present application may contain a chelating agent from the viewpoint of sterilizing performance and decolorizing ability of bacteria-derived stains. Specific examples include one or more selected from aminopolyacetic acids such as ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, and hydroxyethyliminodiacetic acid, salts thereof, 1-hydroxyethylidene-1,1-diphosphonic acid, diethylenetriaminepenta(methylenephosphonic acid), and alkali metal or lower amine salts thereof.

[0036] <Anti-redeposition agent and / or polymer-based dispersant> From the viewpoint of sterilizing performance and decolorizing ability of bacterial stains, the treatment liquid of the present application may contain a redeposition inhibitor and / or a polymer-based dispersant. Specific examples of the dispersant include one or more selected from polyacrylic acid, polymaleic acid, and carboxymethyl cellulose.

[0037] <Bleach> The treatment solution of the present application may contain a bleaching agent from the viewpoint of sterilizing performance and decolorizing ability of stains derived from bacteria. Specific examples of the bleaching agent include one or more selected from hydrogen peroxide, sodium percarbonate, and sodium perborate.

[0038] <Bleach activator> The treatment solution of the present application may contain a bleaching activator from the viewpoint of sterilizing performance and decolorizing ability of stains derived from bacteria. Specific examples of the bleaching activator include tetraacetylethylenediamine and bleaching activators represented by the general formulas (I-2) to (I-7) of JP-A-6-316700.

[0039] <Enzyme> The treatment solution of the present application may contain an enzyme from the viewpoint of sterilizing performance and decolorizing ability of bacteria-derived stains. Specifically, the enzyme may be one or more enzymes selected from amylase, sucrase, maltase, lactase, pullulanase, fructofuranosidase, cellulase, protease, and lipase.

[0040] <Antioxidants> The treatment liquid of the present application may contain an antioxidant from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. Specifically, known antioxidant compounds such as butyl hydroxytoluene (common name: BHT), butyl hydroxyanisole (common name: BHA), distyrenated cresol, ascorbic acid (common name: vitamin C), tocopherol (common name: vitamin E), coffee bean extract (chlorogenic acid), green tea extract (catechin), etc., or known inorganic salts such as sodium sulfite and sodium hydrogen sulfite can be used.

[0041] <Ultraviolet absorbing agent> The treatment liquid of the present application may contain an ultraviolet absorbing agent. Specifically, examples of the ultraviolet absorbing agent include 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-[4-diethylamino-2-hydroxybenzoyl]benzoic acid hexyl ester, 4-tert-butyl-4'-methoxydibenzoylmethane, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, oxybenzone, oxybenzone sulfonic acid, octocrylene, 2-ethylhexyl salicylate, homomenthyl salicylate, diethylaminohydroxybenzoate, and the like. Examples of the ultraviolet absorbing agent include organic ultraviolet absorbing agents such as dibenzoylhexyl benzoate, terephthalylidene dicamphor sulfonic acid, drometrizole trisiloxane, 2-ethylhexyl paramethoxycinnamate, bisethylhexyloxyphenol methoxyphenyl triazine, hydroxymethoxybenzophenone sulfonic acid, phenylbenzimidazole sulfonic acid, ferulic acid, homosalate, homomenthyl salicylate, and methylene bisbenzotriazolyl tetramethylbutylphenol; and inorganic ultraviolet absorbing agents such as titanium oxide and zinc oxide.

[0042] <Hydrotrope Agent> The treatment liquid of the present application may contain a hydrotrope agent from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains. The hydrotrope agent is an organic compound having an anionic group, and further contains one or two alkyl groups selected from a methyl group, an ethyl group, or a propyl group, and has one sulfonic acid group or carboxylic acid group, or a salt thereof, and benzoic acid or a salt thereof can be used. More specifically, paratoluenesulfonic acid, cumenesulfonic acid, metaxylenesulfonic acid, and benzoic acid can be exemplified. From the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains, the salt is preferably an alkali metal salt.

[0043] <Deodorizing base material> The treatment liquid of the present application may contain a deodorizing base material from the viewpoints of sterilization performance and the ability to decolorize stains derived from bacteria. Specifically, examples thereof include the polyhydroxyamine compounds described in JP-A-2018-29836. Examples of the polyhydroxyamine compound include tris(hydroxymethyl)aminomethane, 2-amino-1,3-propanediol, 2-amino-2-methyl-1,3-propanediol, 2-amino-2-ethyl-1,3-propanediol, 2-amino-2-hydroxyethyl-1,3-propanediol, and inorganic acids such as hydrochloric acid thereof.

[0044] The pH of the treatment liquid of the present invention at 25°C is 6 or less, preferably 5 or less, more preferably 4 or less, still more preferably 3 or less, and 2 or more from the viewpoints of sterilization performance and the ability to decolorize stains derived from bacteria. The pH is a value measured at 25°C using a glass electrode. Specifically, it is measured by the following method. <Method for Measuring pH> Calibrate the pH electrode (type 6367) in advance with a phthalic acid buffer solution (pH 4.01), a phosphate standard solution (pH 6.84), and a borate standard solution (pH 9.18) using a pH meter D-52 manufactured by Horiba, Ltd., and rinse well with ion-exchanged water. Immerse the pH electrode calibrated and washed as described above in the treatment liquid adjusted to 25°C, and measure using the AUTO HOLD mode of the pH meter until the measured value becomes constant.

[0045] The treatment liquid of the present invention can be obtained by blending water with the (a) component, (b) component, (c) component, and optional components, and setting the content of each component and the pH of the treatment liquid to predetermined values. Examples of the water that can be used include ion-exchanged water, tap water, and purified water. The hardness of the water may be 0.5°dH or more, 1°dH or more, 1.5°dH or more, and 20°dH or less, 10°dH or less, 5°dH or less in terms of German hardness from the viewpoints of sterilization performance and the ability to decolorize stains derived from bacteria.

[0046] Here, German hardness (°dH) in this specification refers to the concentration of calcium and magnesium in water expressed as a CaCO3 equivalent concentration of 1 mg / L (ppm) = approximately 0.056°dH (1°dH = 17.8 ppm). The calcium and magnesium concentrations for the German hardness scale are determined by chelate titration using disodium salt of ethylenediaminetetraacetic acid. A specific method for measuring the German hardness of water in this specification is shown below. <Method of measuring water hardness in Germany> 〔reagent〕 0.01 mol / L EDTA·2Na solution: 0.01 mol / L aqueous solution of disodium ethylenediaminetetraacetate (titration solution manufactured by SIGMA-ALDRICH) Universal BT indicator (Universal BT, Dojindo Laboratories, Inc.) Ammonia buffer solution for hardness measurement (67.5 g of ammonium chloride dissolved in 570 mL of 28 w / v% ammonia water, and the total volume made up to 1000 mL with ion-exchanged water) [Measurement of hardness] (1) Using a volumetric pipette, collect 20 mL of sample water into a conical beaker. (2) Add 2 mL of ammonia buffer solution for hardness measurement. (3) Add 0.5 mL of Universal BT indicator. After addition, confirm that the solution is reddish purple. (4) While thoroughly shaking the conical beaker, add 0.01 mol / L EDTA 2Na solution dropwise from the burette until the sample water turns blue, which is the endpoint of the titration. (5) Total hardness is calculated using the following formula. Hardness (°dH)=T×0.01×F×56.0774×100 / A T:0.01mol / L Titration amount of EDTA・2Na solution (mL) A: Sample volume (20 mL, volume of sample water) F: Factor of 0.01mol / L EDTA·2Na solution

[0047] The treatment solution of the present invention has excellent bactericidal effects against bacteria including E. coli, and is also excellent in removing colored pigments and other bacteria-derived stains attached to textile products and hard surfaces. Therefore, it can be used for the bactericidal performance and decolorization of bacterial stains on textile products and hard surfaces used not only in ordinary households but also in medical and nursing care facilities. Examples of bacteria that can be treated with the treatment solution of the present invention include one or more species selected from Escherichia coli, bacteria of the genus Moraxella, bacteria of the genus Micrococcus, bacteria of the genus Methylobacterium, bacteria of the genus Acinetobacter, bacteria of the genus Pseudomonas, bacteria of the genus Bacillus, bacteria of the genus Sphingomonas, bacteria of the genus Ralstonia, bacteria of the genus Cupriavidus, bacteria of the genus Psychorobacter, bacteria of the genus Serratia, bacteria of the genus Escherichia, bacteria of the genus Staphylococcus, and bacteria of the genus Burkholderia.

[0048] The treatment liquid of the present invention is excellent in that it has excellent performance in sterilizing bacteria attached to hard surfaces and textile products, and is also excellent in that it can decolorize pigments derived from bacteria attached to hard surfaces and textile products. That is, the present invention can provide a sterilization method that uses the treatment liquid of the present invention to simultaneously sterilize bacteria attached to hard surfaces or textile products and decolorize pigments derived from the bacteria.

[0049] <Methods for treating textiles, hard surfaces and aqueous solutions> From the viewpoint of sterilizing performance and decolorizing ability of bacteria-derived stains, the treatment liquid of the present invention can be applied to fibers, hard surfaces and aqueous solutions on which stains and bacteria are present. Also provided is a method in which the treatment liquid is brought into contact with a bacterial liquid in which dirt coexists.

[0050] The treatment solution of the present invention can be applied to fibers and hard surfaces by coating, spraying, etc., from the viewpoint of sterilizing performance and decolorizing ability of bacteria-derived stains. There is no limitation on the coating method, and general-purpose methods such as brush coating, spraying, and sheets can be used.

[0051] From the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains, the sterilization method of the present invention can be carried out by applying the treatment solution to textile products such as clothing, towels, bedding, textile products for bedding (sheets, pillowcases, etc.), masks, curtains, etc. Other washable textile products can also be targeted. From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, examples of materials for textile products include natural fibers such as cotton, linen, wool, and silk, synthetic fibers such as polyester and acrylic, and blends of these fibers. It can also be applied to hard surfaces such as washing machine drum bases (polypropylene, stainless steel, etc.), metal, wood, plastic, and paper. From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, specific examples of hard surfaces include furniture, electrical appliances, items around water, building materials, fixtures, clothing, bedding, and the like, and more specific examples include the hard surfaces of items selected from tables, chairs, sinks, toilet seats, doorknobs, water faucets, floors, bathtubs, switches, remote control devices (such as remote controllers for various devices), computer input devices (such as keyboards and mice), wallpaper, and wallpapered ceilings. From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, examples of the material that can be used include elevator switches installed in buildings, handrails of escalators installed in buildings, ticket vending machines in public transportation, straps in vehicles, and shopping baskets and carts that are frequently used in commercial facilities. Furthermore, it can also be applied to a bacterial liquid or the like in which dirt coexists.

[0052] From the viewpoint of bactericidal performance and decolorization ability of bacterial stains, it is preferable to apply it to items around water such as textile products, washing machine tubs, sinks, water faucets, bathtub floors, bathtubs, etc.

[0053] The hardness of water used in the sterilization method, such as the water used to prepare the treatment solution and the water used for rinsing, can also be selected from the preferred range of water hardness containing the hardness components described for the treatment solution of the present invention. The method for measuring water hardness can be the same as that for the water hardness described above.

[0054] In recent years, washing machines have become larger, and the value of the liquor ratio, which is the ratio of the mass of the textile product (kg) to the amount of water in the treatment solution (liters), i.e., the amount of water in the treatment solution (liters) / mass of the textile product (kg) (hereinafter, this ratio may be referred to as the liquor ratio), tends to decrease. From the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains, the liquor ratio is preferably 5 or more, more preferably 10 or more, and even more preferably 20 or more, and is preferably 150 or less, and more preferably 100 or less.

[0055] In the method for sterilizing a textile product of the present invention, the treatment time is, from the viewpoints of sterilization performance and decolorization ability of bacterial stains, preferably 1 minute or more, more preferably 3 minutes or more, even more preferably 5 minutes or more, and preferably 1 hour or less, more preferably 60 minutes or less, even more preferably 30 minutes or less, and even more preferably 10 minutes or less.

[0056] The sterilization method for textile products of the present invention is suitable for a method of immersing textile products in a liquid used for scouring while feeding the textile products with rollers or the like, and a rotary treatment method. The rotary treatment method means a treatment method in which a textile product not fixed to a rotating device rotates around a rotating shaft together with a treatment liquid. The rotary treatment method can be carried out by a rotary washing machine. Therefore, in the present invention, from the viewpoint of sterilization performance and decolorization ability of bacteria-derived stains, it is preferable to treat the textile product using a rotary washing machine. Specific examples of the rotary washing machine include a drum washing machine, a pulsator washing machine, and an agitator washing machine. These rotary washing machines can be commercially available for home use.

[0057] By using the treatment liquid of the present invention, it is possible to obtain an excellent bactericidal effect against bacteria attached to hard surfaces or textile products, and to simultaneously decolorize pigments derived from bacteria attached to hard surfaces or textile products. In this case, even if oily stains derived from sebum or food, water-soluble stains derived from beverages, sweat, urine, mud, soil, etc., insoluble stains derived from sand, dust, soot, clay, iron powder, etc., protein stains derived from starch, dirt, keratin, food, blood, etc., pigment stains derived from spots, etc., are coexisting on the hard surfaces or textile products, the bactericidal effect and decolorizing effect can be sufficiently exhibited. EXAMPLES

[0058] <Preparation of Processing Solution (1)> In the examples and comparative examples in Table 1, a treatment liquid (1) was prepared by adjusting the following components (a), (b) and (c) to the concentrations shown in Table 1 using ion-exchanged water and used. (a) Ingredients (a-1) Sodium alkylbenzene sulfonate: Neopelex G-25 manufactured by Kao Corporation (b) Component (b-1) Polyoxyethylene with an average added mole number of 10 (C12 alkyl ether: E110L manufactured by Kao Corporation) (b-2) Polyoxyethylene (carbon number 12-14 secondary alkyl) ether with an average added mole number of 3: SFT33 manufactured by Nippon Shokubai Co., Ltd. (c) Component (c-1) Citric acid: Fujifilm Wako Pure Chemical Industries, Ltd. (c-2) Lactic acid: Fujifilm Wako Pure Chemical Industries, Ltd.

[0059] E. coli or Methylobacterium solutions (1a) and (1b) containing horse serum as a protein stain were prepared as follows. <Preparation of bacterial suspensions (1a) and (1b)> E. coli (NBRC3972) was smeared on SCDLP agar medium (Nihon Pharmaceutical Co., Ltd.) and cultured at 37°C for more than 24 hours. Methylobacterium variable B1 was smeared on PDA agar medium (Nihon Pharmaceutical Co., Ltd.) and grown at 30°C for one month. The bacteria were diluted with ion-exchanged water to obtain a bacterial solution, which was then cultured on the PDA agar medium for one day. The colonies grown on the agar medium were collected with a disposable loop and diluted with ion-exchanged water to a concentration of 1.0 × 10 9 A bacterial solution (1a) containing E. coli CFU / mL and 1% horse serum (Invitrogen) and 1.0 × 10 8 A bacterial solution (1b) containing CFU / mL Methylobacterium and 1% horse serum was prepared.

[0060] <Sterilization operation> 0.02 mL of the bacterial solution (1a) or (1b) containing horse serum was added to 0.18 mL of the prepared treatment solution, mixed thoroughly, and left to stand at room temperature for 10 minutes. 0.02 mL of the mixture was taken and mixed with 0.18 mL of SCDLP dilution solution (Nihon Pharmaceutical Co., Ltd.) to stop the bactericidal reaction. The mixture in which the bactericidal components in the treatment solution were inactivated was diluted stepwise. Escherichia coli was pour cultured using SCD agar medium (Nihon Pharmaceutical Co., Ltd.) and cultured at 37°C for more than 24 hours. Methylobacterium was pour cultured using PDA agar medium and cultured at 30°C for 3 days. After culture, the number of colonies obtained was counted, the common logarithm of the viable cell count (CFU / mL) was calculated, and the bactericidal activity value was calculated from the difference with the blank (ion-exchanged water). The higher the bactericidal activity value, the better the bactericidal performance.

[0061] A Methylobacterium solution (1c) was prepared as follows. <Preparation of bacterial solution (1c)> Methylobacterium variable B1 was smeared on PDA agar medium and cultured at 30°C for more than 3 days. Colonies grown on the agar medium were collected with a disposable loop and diluted with ion-exchanged water to obtain 1.0 × 10 8 A bacterial solution containing CFU / mL of bacteria (1c) was prepared.

[0062] <Evaluation of Methylobacterium-derived pink stain removal> Twelve 1.5 cm square pieces of Hiraori cotton cloth (Tanigashou Shoten) were arranged on a PDA agar medium, attached with a Conlarj stick, and then 0.025 mL of the prepared bacterial solution (1c) was applied to each piece. The cloth was cultured at 30°C for 24 hours. After confirming that the entire cloth had turned pink, the cloth was peeled off from the agar medium with tweezers, air-dried on a metal mesh, and left to stand at room temperature for about 5 months, and this was used as the test cloth. One test cloth was placed in 2 mL of each treatment solution in Table 1 and left to soak for 15 hours, then clamped with tweezers and rinsed left and right 10 times in 300 mL of ion-exchanged water. Next, the moisture was removed on a Kimtowel and air-dried on a metal mesh. The Z value of the cloth after soaking was measured using a handy spectrophotometer (N777, Nippon Denshoku Kogyo Co., Ltd.), and the difference from the Z value before washing, which was estimated in advance, was calculated to calculate the removal performance (ΔZ) of microbial stains using the following formula. The higher the ΔZ value, the better the removal performance. Removal performance of bacterial pink stains ΔZ=AB A: Z value after cleaning B: Z value before cleaning

[0063] [Table 1]

[0064] As shown in the examples of Table 1, by using a treatment solution containing the specified amounts of components (a) to (c), good bactericidal activity against Escherichia coli and Methylobacterium was exhibited, and pink stains derived from Methylobacterium were also efficiently removed. On the other hand, in Comparative Example 1, where the (a) component / (b) component ratio was greater than 2, the bactericidal activity against E. coli and Methylobacterium was high, but the removal of pink stains derived from Methylobacterium was insufficient. In Comparative Example 2, where the (a) component / (b) component ratio was less than 0.6, the bactericidal activity against E. coli was low. In Comparative Example 3, where the (c) component was less than 35 ppm, the bactericidal activity against E. coli and Methylobacterium was low. In Comparative Example 4, which did not contain the (c) component and had a pH higher than 6, the bactericidal activity against E. coli and Methylobacterium and the removal of pink stains derived from Methylobacterium were insufficient. Furthermore, when the (a) component or the (b) component was lacking, the bactericidal activity was low.

[0065] <Preparation of Processing Solution (2)> In the examples shown in Table 2, the following components (a), (b) and (c) were adjusted to the contents shown in Table 2 using 3° DH hard water (calcium chloride / magnesium chloride = 8 / 2), and treatment solution (2) was prepared by adding appropriate amounts of optional components. (a) Ingredients (a-1) Sodium alkylbenzene sulfonate: Neopelex G-25 manufactured by Kao Corporation (b) Component (b-1) Polyoxyethylene (C12 alkyl) ether with an average added mole number of 10: E110L manufactured by Kao Corporation (c) Component (c-1) Citric acid: Fujifilm Wako Pure Chemical Industries, Ltd. (c-2) Lactic acid: Fujifilm Wako Pure Chemical Industries, Ltd.

[0066] An E. coli solution (2) containing horse serum as a protein stain was prepared as follows. <Preparation of bacterial solution (2)> E. coli was smeared on NT agar medium and cultured at 37°C for 24 hours or more. Colonies grown on the agar medium were collected with a disposable loop and diluted with ion-exchanged water to obtain 1.0 x 10 E. coli. 9 A bacterial solution (2) containing CFU / mL and 0.12% horse serum was prepared.

[0067] <Evaluation of bactericidal activity against bacteria on fabric> 0.017 mL of the bacterial solution was applied to the center of a 3 cm square piece of Hiraori cotton cloth (Tanigashiro Shoten) and dried for 20 minutes. The test cloth inoculated with the bacterial solution was placed in the treatment solution (2) and placed in a tumbler stirring device (Matsushita Kogyo Co., Ltd.). After stirring for 10 minutes (1 rotation / 1 second), the test cloth was removed and placed in 10 mL of SCDLP dilution solution. The bacteria were extracted by treatment with an ultrasonic cleaner for 3 minutes, and the extract was diluted stepwise. The mixture was cultured using SCD agar medium and cultured at 37°C for more than 24 hours. After culture, the number of colonies obtained was counted and the common logarithm of the viable bacteria count (CFU / mL) was calculated. The number of bacteria extracted from a test cloth treated with 0.05% Tween 80 (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.) instead of treatment solution (2) was used as a control, and the bactericidal activity value was calculated using the following formula. Bactericidal activity value = LogA-LogB A: Number of bacteria extracted from test cloth treated with 0.05% Tween 80 B: Number of bacteria extracted from test cloth treated with treatment solution (2)

[0068] <Evaluation of bactericidal activity against bacteria on hard surfaces> The prepared bacterial liquid was applied at 5 locations (4 μL each, 20 μL in total) to a 15 mm square stainless steel plate (SUS, Engineering Test Services) and a 15 mm square polypropylene plate (PP), and left to dry to prepare test specimens. Each test piece was fixed and placed in a 6-hole petri dish, 2 mL of treatment solution (2) was added, and the mixture was stirred at 50 rpm for 10 minutes (TAITEC bioshaker). After removing the cleaning solution with a pipette, 2 mL of 3°DH hard water was added and the specimens were rinsed for 3 minutes (150 rpm). After repeating the above operation two more times, the test pieces were placed in 10 mL of SCDLP diluted solution. The mixture was treated with an ultrasonic cleaner for 3 minutes to extract the bacterial cells, and the extract was serially diluted. The mixture was then cultured on SCD agar medium at 37°C for 24 hours or more. After the culture, the number of colonies obtained was counted, and the common logarithm of the viable bacterial count (CFU / mL) in the mixture was calculated. The number of bacteria extracted from a test piece treated with 0.05% Tween 80 instead of the treatment solution (2) was used as a control, and the bactericidal activity value was calculated from the following formula. Bactericidal activity value = LogA-LogB A: Number of bacteria extracted from test cloth treated with 0.05% Tween 80 B: Number of bacteria extracted from test pieces treated with treatment solution (2)

[0069] [Table 2]

[0070] As shown in Table 2, even when a treatment solution containing each optional component is used, by using a treatment solution containing the specified amounts of components (a) to (c), it is possible to exhibit good bactericidal activity against E. coli and Methylobacterium, and also to efficiently remove pink stains derived from Methylobacterium.

[0071] The blends in the examples of Table 3 also exhibit good bactericidal activity against Escherichia coli and Methylobacterium, and can also efficiently remove pink stains caused by Methylobacterium.

[0072] [Table 3]

Claims

1. Treatment solution containing the following components (a) to (c) (a) Ingredients: Anionic surfactant (b) Ingredients: Nonionic surfactant (c) Component: Hydroxycarboxylic acid Here, (i) The mass ratio of component (a) to component (b), (a) / (b), is 0.60 or more and less than 2.

0. (ii)(c) The content of component is 35 ppm or more, (iii) pH is between 2 and 6 at 25°C. That is, A sterilization method that uses [a specific method / tool].

2. (c) The sterilization method according to claim 1, wherein the component is two or more hydroxycarboxylic acids.

3. (a) The sterilization method according to claim 1 or 2, wherein the component is an alkylbenzene sulfonate.

4. (b) Component is the following general formula (1) R １ｂ -(A) ｍ O-(AO) ｎ -R ２ｂ (1) [In the formula, R １ｂ R is an aliphatic hydrocarbon group having 9 to 18 carbon atoms, ２ｂ is a hydrogen atom or a methyl group, CO is a carbonyl group, m is a number of 0 or 1, and AO is one or more alkylene oxy groups selected from alkylene oxy groups having 2 carbon atoms and alkylene oxy groups having 3 carbon atoms. If AO contains an ethylene oxy group and a propylene oxy group, the ethylene oxy group and the propylene oxy group may be bonded in a block type or a random type. n is the average number of moles added, and is a number between 1 and 70. A sterilization method according to claim 1 or 2, as represented by the following:

5. It contains the following components (a) to (c), (a) Ingredients: Anionic surfactant (b) Ingredients: Nonionic surfactant (c) Component: Hydroxycarboxylic acid Here, (i) The mass ratio of component (a) to component (b), (a) / (b), is 0.60 or more and less than 2.

0. (ii)(c) The content of component is 35 ppm or more, (iii) pH is between 2 and 6 at 25°C. It is a treatment solution for sterilization.