Liquid detergent composition for clothing
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2026-01-29
- Publication Date
- 2026-08-13
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Figure JPOXMLDOC01-APPB-T000001
Abstract
Description
Liquid detergent composition for clothing
[0001] The present invention relates to a liquid detergent composition for clothing and a method for washing clothing.
[0002] In detergents for clothing, surfactants play an important role as components for removing sebum stains and the like during clothing washing, and the proportion of surfactants in the detergent components is high.
[0003] Generally, surfactants used in detergents emit a large amount of carbon dioxide during their preparation, resulting in a large environmental burden. If the amount of surfactants formulated in detergents can be reduced, the carbon dioxide emissions can be reduced, contributing to the development of eco-friendly detergents that are also advantageous in terms of cost.
[0004] Also, it is known that the detergency is improved by making the detergent used for washing clothing alkaline (see Non-Patent Document 1).
[0005] Journal of Tokyo Kasei Gakuin University, Vol. 51, pp. 45 - 52, 2011
[0006] Reducing the surfactant in the detergent components significantly causes a decrease in detergency, and even for detergents with a reduced amount of surfactant used, high detergency is required.
[0007] Also, as described above, in order to enhance detergency, it is conceivable to make the liquid detergent alkaline. However, when formulating solid components such as alkaline agents to make the liquid detergent alkaline, problems such as the solid components precipitating and separating during the storage of the liquid detergent and being unable to be easily redispersed, or the viscosity of the liquid detergent becoming too high and making it difficult to inject into the washing tub of the washing machine are likely to occur. Especially at low temperatures (for example, about 5°C), the storage stability (low-temperature stability) may be poor. When formulating the solid components such as alkaline agents contained in the liquid detergent to such an extent that they do not precipitate and separate, it has been found that sufficient alkalinity cannot be obtained and it becomes difficult to improve the detergency.
[0008] Also, it has been found that when clothing with sebum stains and the like is repeatedly washed (laundered), it cannot be washed sufficiently and the problem of sebum stains remaining also occurs.
[0009] Therefore, the problem that the present invention aims to solve is to provide a liquid laundry detergent composition that can reduce the amount of surfactant used, reduce environmental impact, is cost-effective, and also has excellent low-temperature stability and cumulative cleaning power.
[0010] Therefore, in order to solve the above problems, the present inventors conducted diligent research and found that the above problems can be solved by the following liquid laundry detergent composition.
[0011] In other words, the present invention relates to a liquid laundry detergent composition having a pH greater than 9 at 25°C, containing (a) 5% to 20% by mass of a surfactant, (b) 0.5% to 10% by mass of an inorganic alkali salt, and (c) 0.0025% by mass or more of lipase.
[0012] The present invention also relates to a method for washing clothes, comprising contacting clothes with a washing solution containing (a) 0.005% by mass or more and 0.4000% by mass or less of a surfactant, (b) 0.0005% by mass or more and 0.2000% by mass or less of an inorganic alkali salt, and (c) 0.0000005% by mass or more of lipase.
[0013] According to the present invention, it is possible to reduce the amount of surfactant used, thereby reducing environmental impact, offering excellent cost-effectiveness, low-temperature stability, and superior cumulative cleaning power, making it a useful liquid laundry detergent composition.
[0014] The present invention will be described in detail below.
[0015] The present invention relates to a liquid laundry detergent composition having a pH greater than 9 at 25°C, containing (a) 5% to 20% by mass of a surfactant, (b) 0.5% to 10% by mass of an inorganic alkali salt, and (c) 0.0025% by mass or more of lipase. The surfactant (a) contained in the liquid laundry detergent composition has excellent cleaning properties against sebum stains, and the inorganic alkali salt (b) is useful because it can supplement the cleaning properties (sebum cleaning properties) against sebum stains (fatty acids, etc.) even when the amount of surfactant (a) used is reduced. Furthermore, the lipase (c) exhibits excellent decomposition properties against sebum stains (fatty acids, etc.) and bactericidal properties even when the amount of surfactant (a) used is reduced, resulting in improved cumulative cleaning power and excellent prevention of re-soiling. Moreover, since inorganic alkali salts (b) may precipitate at low temperatures, using the lipase (c) in combination with the inorganic alkali salt (b) allows for a reduction in the amount of inorganic alkali salt used, contributing to low-temperature stability and proving useful.
[0016] The content ratio of each component refers to the content ratio (mass%) of the active ingredient of each component contained in the aforementioned liquid laundry detergent composition (including solvents such as water).
[0017] <(a) Surfactant> The liquid laundry detergent composition of the present invention contains (a) a surfactant (hereinafter referred to as "component (a)"). The liquid laundry detergent composition contains component (a), which provides excellent cleaning power and makes it useful.
[0018] The component (a) is preferably one or more surfactants selected from nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants, from the viewpoint of improving cleaning power, preventing re-soiling, and low-temperature stability.
[0019] (Anionic surfactant) When component (a) is an anionic surfactant (hereinafter referred to as "component (a1)"), there are no particular limitations, but from the viewpoint of improving cleaning power and preventing re-soiling, for example, one or more anionic surfactants selected from the group consisting of alkylaryl sulfonic acid type surfactants, sulfate ester type surfactants, alkane sulfonic acid type surfactants, olefin sulfonic acid type surfactants, alkyl sulfosuccinate type surfactants, and sulfo fatty acid ester type surfactants can be mentioned.
[0020] When the anionic surfactant of component (a1) is a salt, examples of the salt of component (a1) include inorganic salts such as sodium salt, potassium salt, ammonium salt, and magnesium salt, and organic salts such as monoethanolamine salt, diethanolamine salt, triethanolamine salt, and morpholine salt. The salt of component (a1) is preferably an inorganic salt selected from alkali metal salts such as sodium salt and potassium salt, and alkaline earth metal salts such as magnesium salt, more preferably an alkali metal salt, and even more preferably a sodium salt. The same applies to the salts of the specific examples of component (a1) below.
[0021] Examples of alkylarylsulfonic acid type surfactants of component (a1) include alkylbenzenesulfonates. Specifically, examples include alkylbenzenesulfonates having an alkyl group with preferably 6 or more carbon atoms, more preferably 8 or more, and preferably 18 or fewer carbon atoms, and more preferably 15 or fewer carbon atoms. In alkylbenzenesulfonic acid, the carbon atoms of the alkyl group bonded to the carbon atoms of the benzene ring may be secondary carbon atoms.
[0022] Examples of the sulfate ester-type surfactant of component (a1) include anionic surfactants having a hydrocarbon group with preferably 8 to 20 carbon atoms and a sulfate ester group. The hydrocarbon group preferably has 8 or more carbon atoms, more preferably 10 or more, even more preferably 12 or more, and preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less. The hydrocarbon group is preferably an alkyl group.
[0023] Examples of the sulfate ester type surfactant of component (a1) include alkyl sulfate salts and polyoxyalkylene alkyl ether sulfate salts.
[0024] The alkyl sulfate ester salt is preferably an alkyl sulfate ester salt having an alkyl group with a number of carbon atoms of 8 or more, more preferably 10 or more, preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less. Furthermore, alkyl sulfate ester salts having a linear or branched alkyl group with the aforementioned number of carbon atoms are more preferable.
[0025] The polyoxyalkylene alkyl ether sulfate salt is preferably a polyoxyalkylene alkyl ether sulfate salt in which one or more oxyalkylene groups selected from oxyalkylene groups having 2 to 3 carbon atoms, preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.4 or more, preferably 6 or less, more preferably 3 or less, and even more preferably 1.5 or less, having an alkyl group having 8 or more carbon atoms, more preferably 20 or less, more preferably 18 or less, even more preferably 14 or less, and even more preferably 12 or less, and a linear or branched alkyl group, is added, and the average number of moles of these groups is preferably 0.1 or more, more preferably 0.3 or more, even more preferably 0.4 or more, and preferably 6 or less, more preferably 3 or less, and even more preferably 1.5 or less. The oxyalkylene group preferably has 2 carbon atoms. Furthermore, if the oxyalkylene group includes an ethylene oxy group and a propylene oxy group, the ethylene oxy group and the propylene oxy group may be block-bonded or randomly bonded.
[0026] Examples of the alkanesulfonic acid type surfactant of component (a1) include alkanesulfonates in which the number of carbon atoms in the alkane portion is preferably 8 or more, more preferably 10 or more, even more preferably 14 or more, and preferably 20 or less, more preferably 18 or less.
[0027] Examples of the olefin sulfonate-type surfactant of component (a1) include α-olefin sulfonates and internal olefin sulfonates. Specifically, α-olefin sulfonates include α-olefin sulfonates in which the number of carbon atoms in the olefin portion is preferably 8 or more, more preferably 10 or more, even more preferably 14 or more, and preferably 22 or less, more preferably 20 or less, and even more preferably 18 or less.
[0028] The internal olefin sulfonate mentioned above specifically refers to an internal olefin sulfonate having preferably 8 or more carbon atoms, more preferably 12 or more, even more preferably 16 or more, and preferably 24 or less, more preferably 20 or less, and even more preferably 18 or less carbon atoms. Here, the internal olefin sulfonate may be a mixture obtained by sulfonating, neutralizing, and hydrolyzing an internal olefin having the same number of carbon atoms as described above, using the method described in Japanese Patent Application Publication No. 2014-76988.
[0029] The alkyl sulfosuccinate ester type surfactant of component (a1) is preferably a monoester and / or diester of sulfosuccinate with an aliphatic alcohol having 5 or more carbon atoms, more preferably 6 or more, even more preferably 7 or more, and preferably 18 or less, more preferably 14 or less, and even more preferably 10 or less, and more preferably a diester of the alcohol and sulfosuccinate. The alkyl ester of sulfosuccinate may be an acid or a salt. The aliphatic alcohol is preferably a branched alcohol. The alkyl sulfosuccinate ester type surfactant may be a compound selected from branched alkyl sulfosuccinate monoesters and / or diesters having the above number of carbon atoms and branched alkyl groups, and salts thereof.
[0030] Specifically, one or more surfactants selected from diethylhexyl sulfosuccinic acid, dipropylheptyl sulfosuccinic acid, and their salts are preferred, and more preferably dipropylheptyl sulfosuccinic acid or its salt. Dipropylheptyl sulfosuccinic acid or its salt is preferably di-(2-propylheptyl) sulfosuccinic acid or its salt, and diethylhexyl sulfosuccinic acid or its salt is preferably di-(2-ethylhexyl) sulfosuccinic acid or its salt.
[0031] Examples of the sulfo fatty acid ester-type surfactant of component (a1) include α-sulfo fatty acid salts in which the fatty acid portion has 10 to 18 carbon atoms, and α-sulfo fatty acid lower alkyl ester salts in which the fatty acid portion has 10 to 18 carbon atoms and the ester portion has 1 to 5 carbon atoms.
[0032] (Nonionic surfactant) When component (a) is a (a2) nonionic surfactant (hereinafter referred to as "component (a2)"), there are no particular limitations, but from the viewpoint of improving cleaning power and preventing re-soiling, for example, polyoxyalkylene alkyl or alkenyl ether obtained by adding a total average of 2 moles to 150 moles of ethylene oxide (hereinafter referred to as "EO") and / or propylene oxide (hereinafter referred to as "PO") to a primary or secondary alcohol having 10 to 24 carbon atoms; polyoxyethylene alkylphenyl ether obtained by adding an average of 6 moles to 20 moles of EO to an alkyl group having an average of 6 to 12 carbon atoms; polyoxyalkylene fatty acid ester obtained by adding a total average of 2 moles to 150 moles of EO and / or PO to a fatty acid having an alkyl group or alkenyl group having 10 to 24 carbon atoms; alkyl group having 10 to 24 carbon atoms and an average degree of condensation of 1 to 3 or less Examples include the alkyl glycosides listed below, alkylglucamides with 10 to 24 carbon atoms in the alkyl group; polyoxyalkylene sorbitan fatty acid esters or polyoxyalkylene glycerin fatty acid esters obtained by adding an average of 6 to 30 moles of EO and / or PO to sorbitan fatty acid esters or glycerin fatty acid esters to which 1 to 3 moles of fatty acids having an alkyl group or alkenyl group with 10 to 24 carbon atoms are ester-bonded; polyoxyalkylene sorbitan fatty acid esters obtained by adding an average of 6 to 80 moles of EO and / or PO to sorbitan fatty acid esters with 1 to 3 moles of fatty acids having an alkyl group or alkenyl group with 10 to 24 carbon atoms; and polyoxyalkylene castor oil or hydrogenated castor oil obtained by adding an average of 6 to 80 moles of EO and / or PO to sorbitan fatty acid esters with 1 to 3 moles of EO and / or PO to sorbitan fatty acid esters; and polyoxyalkylene castor oil or hydrogenated castor oil obtained by adding an average of 6 to 80 moles of EO and / or PO to sorbitan fatty acid esters with 10 to 24 carbon atoms are ester-bonded;
[0033] (Cationic surfactant) When component (a) is a cationic surfactant (hereinafter referred to as "component (a3)"), there are no particular limitations, but from the viewpoint of improving cleaning power and storage stability, for example, one or more selected from the group consisting of primary amine salts, secondary amine salts, tertiary amine salts, and quaternary ammonium salts can be mentioned. Among these, quaternary ammonium salts are preferred.
[0034] Examples of the quaternary ammonium salt include compounds in which at least one of the four substituents bonded to the nitrogen atom is an alkyl or alkenyl group having a total of 10 to 28 carbon atoms, and the remainder is a group selected from a benzyl group, an alkyl group having 1 to 5 carbon atoms, and a hydroxyalkyl group having 1 to 5 carbon atoms. The alkyl or alkenyl group having a total of 10 to 28 carbon atoms may be substituted with an alkoxyl group, an alkenyloxy group, an alkanoylamino group, an alkenoylamino group, an alkanoyloxy group, or an alkenoyloxy group within this carbon number range.
[0035] The aforementioned component (a3) includes dialkyldimethylammonium chlorides such as N-lauryl-N-benzyl-N,N-dimethylammonium chloride, N-tetradecyl-N-benzyl-N,N-dimethylammonium chloride, N-tetradecyl-N,N-dimethyl-N-ethylammonium ethyl sulfate, and alkyltrimethylammonium chlorides such as dodecyltrimethylammonium chloride.
[0036] (Amphoteric surfactant) When component (a) is an amphoteric surfactant (hereinafter referred to as "component (a4)"), it is not particularly limited, but from the viewpoint of improving cleaning power and storage stability, for example, one or more selected from amine oxide type surfactants and betaine type surfactants are mentioned.
[0037] Examples of the amine oxide-type surfactant include N-alkyl (8 to 20 carbon atoms)-N,N-dimethylamine oxide and N-alkanoyl (7 to 19 carbon atoms)-aminopropyl-N,N-dimethylamine oxide.
[0038] As the betaine-type surfactant, specifically, one or more selected from alkyl carboxy betaine, alkyl amide carboxy betaine, alkyl sulfo betaine, alkyl amide hydroxy sulfo betaine, and alkyl amino fatty acid salt are mentioned. Preferably, it is one or more selected from alkyl sulfo betaine, alkyl amide propyl-N,N-dimethyl carboxy betaine, alkyl-N,N-dimethyl acetic acid betaine, alkyl-N,N-dimethyl-N-(2-hydroxy sulfo propyl) ammonium sulfo betaine, and alkanoyl amino propyl-N,N-dimethyl-N-sulfo propyl ammonium sulfo betaine. These alkyl groups have 7 or more carbon atoms, preferably 8 or more, more preferably 10 or more, and 18 or less, preferably 16 or less, more preferably 14 or less.
[0039] <(b) Inorganic alkali salt> The liquid detergent composition for clothing of the present invention contains (b) an inorganic alkali salt (hereinafter referred to as "(b) component"). By containing the (b) component, even when the amount of the surfactant which is the (a) component is reduced, it is excellent in detergency (sebum detergency) against sebum stains (such as fatty acids) and is useful.
[0040] As the (b) component, it is preferably included one or more selected from the group consisting of carbonate, hydrogen carbonate, silicate, and tripolyphosphate, and more preferably included one or more selected from the group consisting of carbonate and hydrogen carbonate.
[0041] As the carbonate, alkali metal carbonate is mentioned, and one or more selected from the group consisting of sodium carbonate and potassium carbonate are preferable, and sodium carbonate is more preferable.
[0042] As the hydrogen carbonate, alkali metal hydrogen carbonate is mentioned, and one or more selected from the group consisting of sodium hydrogen carbonate and potassium hydrogen carbonate are preferable.
[0043] As the silicate, alkali metal silicate is mentioned, and one or more selected from the group consisting of sodium silicate and potassium silicate are preferable.
[0044] Examples of the tripolyphosphate include alkali metal salts of tripolyphosphoric acid.
[0045] <(c) Lipase> The liquid detergent composition for clothing of the present invention contains (c) lipase (hereinafter referred to as the "(c) component"). By containing the (c) component, even when the amount of the surfactant as the (a) component is reduced, it has excellent decomposability with respect to sebum stains (such as fatty acids), can exhibit bactericidal performance, is excellent in improving cumulative detergency, and has excellent re-staining prevention properties, which is useful. Further, since the (b) component may cause precipitation or the like at low temperatures, by using the (c) component in combination with the (b) component, the amount of the (b) component used can be suppressed, which can also contribute to low-temperature stability and is useful. Although the (c) component exhibits its function even under neutral conditions, by using the (b) component and adjusting the liquid detergent composition for clothing to be alkaline, the decomposability with respect to sebum stains (such as fatty acids) becomes more remarkable. Therefore, the combined use with the (b) component is very useful.
[0046] The (c) component is not particularly limited. For example, it includes triacylglycerol lipase of E.C. 3.1.1.3, cholesterol esterase of E.C. 3.1.1.13, monoacylglycerol lipase of E.C. 3.1.23, and lipoprotein lipase of E.C. 3.1.1.34.
[0047] The origin of the (c) component is not particularly limited, and examples include lipases derived from animals, plants, or microorganisms. Examples of the lipase derived from microorganisms include those originated from the genus Rhizopus, Aspergillus, Mucor, Pseudomonas, Geotrichum, Penicillium, Candida, etc.
[0048] The aforementioned (c) components include, for example, lipase A "Amano" 6, lipase AY "Amano" 30SD, lipase GS "Amano" 250G, lipase R "Amano", lipase DF "Amano" 15, lipase MER "Amano" (all manufactured by Amano Enzyme Co., Ltd.), olivese (manufactured by Nagase & Co., Ltd.), lipase MY, lipase OF, lipase PL, lipase PLC, lipase QLM, Commercially available products such as lipase QLC, phospholipase D (both manufactured by Meito Industries Ltd.), lipoprotein lipase (manufactured by Oriental Yeast Co., Ltd.), lipase (manufactured by Toyo Brewing Co., Ltd.), Lipex, Lipolase, lipase SP-225 (manufactured by Novozymes), lipase (manufactured by Gist), lipase A, and lipase B (all manufactured by Sapporo Breweries Ltd.) can be used. In the present invention, Lipex and Lipolase (both manufactured by Novozymes) are preferred.
[0049] <Other Ingredients> The liquid laundry detergent composition of the present invention may contain the following ingredients (additives, etc.) to the extent that they do not impair the properties of the present invention. Specifically, these include anti-redeposition agents, dispersants, bleaching agents, bleaching activators, enzymes, fluorescent dyes, antioxidants, pigments, fragrances, antimicrobial preservatives, defoaming agents such as silicones, solvents, pH adjusters, etc. From the viewpoint of storage stability, the sodium formate content in the liquid laundry detergent composition is preferably less than 1% by mass, and more preferably not included at all.
[0050] The enzymes mentioned above include one or more enzymes selected from amylase, protease, cellulase, cellobiose dehydrogenase, peroxidase, xylanase, esterase (excluding component (c)), cutinase, pectinase, mannanase, pectinate lyase, keratinase, reductase, oxidase, lipoxygenase, ligninase, pullulanase, tannase, pentosanase, maranase, β-glucanase, arabinosidase, hyaluronidase, chondroitinase, deoxyribonuclease, and laccase, from the viewpoint of improving cleaning power.
[0051] From the viewpoint of the long-term stability of the liquid laundry detergent composition, the pH adjusting agent can be appropriately used as an alkaline component and an acidic component, respectively. Examples of the alkaline component include sodium hydroxide, potassium hydroxide, alkanolamines, and ammonia. Examples of the acidic component include inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid, and organic acids such as polycarboxylic acids and hydroxycarboxylic acids such as citric acid.
[0052] The solvent can be water or other solvents, from the viewpoint of keeping the liquid laundry detergent composition in a liquid state, but it is preferable to include water in order to keep the composition in a liquid state from low temperatures to room temperature (for example, 0°C to 40°C). The liquid laundry detergent composition diluted with a solvent may be referred to as a detergent solution.
[0053] The aforementioned water can include deionized water (sometimes called ion-exchanged water), purified water, or tap water.
[0054] In the liquid laundry detergent composition of the present invention, the water content is preferably 10% by mass or more, more preferably 20% by mass or more, and preferably 90% by mass or less, and more preferably 80% by mass or less, from the viewpoint of improving formulation stability.
[0055] <Liquid detergent composition for clothing> The liquid detergent composition for clothing of the present invention contains 5% by mass or more and 20% by mass or less of component (a) above, and from the viewpoint of improving cleaning power, preventing re-soiling and storage stability, preferably 6% by mass or more, more preferably 7% by mass or more, even more preferably 8% by mass or more, and from the same viewpoint, preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 16% by mass or less.
[0056] The liquid laundry detergent composition of the present invention contains 0.5% by mass or more and 10% by mass or less of component (b), and from the viewpoint of improving cleaning power and storage stability, preferably 0.7% by mass or more, more preferably 1% by mass or more, even more preferably 2% by mass or more, and from the same viewpoint, preferably 10% by mass or less, more preferably 8% by mass or less, and even more preferably 6% by mass or less.
[0057] The liquid laundry detergent composition of the present invention contains 0.0025% by mass or more of component (c), and from the viewpoint of improving cleaning power and sterilization performance, preferably 0.005% by mass or more, more preferably 0.006% by mass or more, even more preferably 0.0075% by mass or more, and from the same viewpoint, preferably 0.25% by mass or less, more preferably 0.15% by mass or less, and even more preferably 0.1% by mass or less.
[0058] In the liquid laundry detergent composition of the present invention, the mass ratio (b) / (a) of the content of component (a) and the content of component (b) is preferably 0.025 or more, more preferably 0.05 or more, even more preferably 0.1 or more, and from the viewpoint of improving cleaning power and storage stability, preferably 2 or less, more preferably 1 or less, even more preferably 0.8 or less, and even more preferably 0.5 or less.
[0059] In the present invention, from the viewpoint of improving cleaning power and storage stability, the mass ratio (b) / (a) of the content of component (a) to the content of component (b) is preferably 0.025 or more and 2 or less.
[0060] In the liquid laundry detergent composition of the present invention, the mass ratio (c) / (a) of the content of component (c) to the content of component (a) is preferably 0.000125 or more, more preferably 0.00025 or more, even more preferably 0.0004 or more, and even more preferably 0.0005 or more, from the viewpoint of improving cleaning power and sterilization performance, and from the same viewpoint, preferably 0.05 or less, more preferably 0.025 or less, even more preferably 0.015 or less, and even more preferably 0.005 or less.
[0061] In the liquid laundry detergent composition of the present invention, the mass ratio (c) / (b) of the content of component (c) to the content of component (b) is preferably 0.00025 or more, more preferably 0.0005 or more, even more preferably 0.0025 or more, and even more preferably 0.005 or more, from the viewpoint of improving cleaning power and storage stability, and similarly, preferably 0.05 or less, more preferably 0.04 or less, even more preferably 0.03 or less, and even more preferably 0.025 or less.
[0062] From the viewpoint of improving cleaning power and storage stability, the liquid laundry detergent composition of the present invention preferably contains 5% by mass or more and 18% by mass or less of component (a), and 0.5% by mass or more and 8% by mass or less of component (b), more preferably contains 5% by mass or more and 16% by mass or less of component (a), and more preferably contains 0.5% by mass or more and 8% by mass or less of component (b), and even more preferably contains 5% by mass or more and 16% by mass or less of component (a), and 0.5% by mass or more and 6% by mass or less of component (b).
[0063] The pH of the liquid laundry detergent composition of the present invention at 25°C is greater than 9, preferably 9.5 or higher from the viewpoint of improving cleaning power and storage stability, and preferably 11 or lower, more preferably 10.8 or lower from the same viewpoint.
[0064] <Applications> The liquid detergent composition for clothing of the present invention can be applied to hard surfaces such as clothing containing fibers, tableware, bathrooms, floors, and medical equipment. Furthermore, from the viewpoint of being able to clean sebum stains and other dirt attached to clothing products containing fibers even at low temperatures, it is preferably a liquid detergent composition for clothing.
[0065] <Fibers> The objects to be cleaned using the liquid laundry detergent composition described above are not particularly limited, but examples include clothing products (textile products) containing fibers. The fibers contained in the clothing product may be either hydrophobic fibers or hydrophilic fibers.
[0066] Examples of the hydrophobic fibers include protein fibers (milk protein casein fibers, Promix, etc.), polyamide fibers (nylon, etc.), polyester fibers (polyester, etc.), polyacrylonitrile fibers (acrylic, etc.), polyvinyl alcohol fibers (vinylon, etc.), polyvinyl chloride fibers (polyvinyl chloride, etc.), polyvinylidene chloride fibers (vinylidene, etc.), polyolefin fibers (polyethylene, polypropylene, etc.), polyurethane fibers (polyurethane, etc.), polyvinyl chloride / polyvinyl alcohol copolymer fibers (Polyclar, etc.), polyalkylene paraoxybenzoate fibers (benzoate, etc.), polyfluoroethylene fibers (polytetrafluoroethylene, etc.), glass fibers, carbon fibers, alumina fibers, silicone carbide fibers, rock fibers, slag fibers, metal fibers (gold thread, silver thread, steel fiber), etc.
[0067] Examples of hydrophilic fibers include seed hair fibers (cotton, cotton, kapok, etc.), bast fibers (hemp, flax, ramie, cannabis, jute, etc.), leaf vein fibers (Manila hemp, sisal hemp, etc.), coconut fibers, rush, straw, animal hair fibers (wool, mohair, cashmere, camel hair, alpaca, vicuña, angora, etc.), silk fibers (domestic silk, wild silk), feathers, and cellulose fibers (rayon, polynosic, cupro, acetate, etc.).
[0068] The liquid laundry detergent composition of the present invention has the effect of cleaning sebum stains and other dirt attached to clothing products, including the aforementioned fibers, even at low temperatures, compared to conventionally known liquid laundry detergent compositions.
[0069] <Textile Products> In the present invention, clothing products (textile products) refer to woven fabrics, knitted fabrics, nonwoven fabrics, etc., using the hydrophobic fibers or hydrophilic fibers, and products such as undershirts, T-shirts, dress shirts, blouses, slacks, hats, handkerchiefs, towels, knitwear, socks, underwear, tights, etc., obtained using the same.
[0070] <Cleaning Method> The present invention relates to a method for cleaning clothes, comprising contacting clothes with a cleaning solution containing (a) a surfactant in an amount of 0.0050% by mass or more and 0.4000% by mass or less, (b) an inorganic alkali salt in an amount of 0.0005% by mass or more and 0.2000% by mass or less, and (c) lipase in an amount of 0.0000005% by mass or more. The method for cleaning clothes can use the cleaning solution and contains the same components as the liquid detergent composition for clothes, so the matters described for the liquid detergent composition for clothes can be applied as appropriate.
[0071] Furthermore, when using the aforementioned liquid detergent composition for clothing during washing (laundry), it is diluted with a solvent such as water to form a diluted solution, and this diluted solution is referred to as the washing solution.
[0072] The aforementioned clothing is not particularly limited, but examples include clothing products (textile products).
[0073] The aforementioned cleaning method is a cleaning method for clothing. Since the aforementioned cleaning method contains the same components as the aforementioned liquid detergent composition for clothing, it can be applied to clothing containing fibers, and in particular, it can be used as a cleaning method for clothing because it can clean sebum stains and other dirt attached to clothing products containing fibers, even at low temperatures.
[0074] In the above-mentioned washing method, the washing solution brought into contact with the clothing contains 0.0050% by mass or more and 0.4000% by mass or less of component (a), and from the viewpoint of improving washing power and preventing re-soiling, preferably 0.0070% by mass or more, more preferably 0.0080% by mass or more, even more preferably 0.0100% by mass or more, and from the same viewpoint, preferably 0.3500% by mass or less, more preferably 0.3000% by mass or less, and even more preferably 0.2500% by mass or less.
[0075] In the above-mentioned washing method, the washing solution brought into contact with the clothing contains 0.0005% by mass or more and 0.2000% by mass of component (b), and from the viewpoint of improving washing power and storage stability, preferably 0.0008% by mass or more, more preferably 0.0010% by mass or more, and from the same viewpoint, preferably 0.1500% by mass or less, more preferably 0.1300% by mass or less, and even more preferably 0.1000% by mass or less.
[0076] In the above-mentioned washing method, the washing solution brought into contact with the clothing contains 0.0000005% by mass or more of component (c), and from the viewpoint of improving washing power and sterilization performance, preferably 0.000001% by mass or more, more preferably 0.0000025% by mass or more, even more preferably 0.000005% by mass or more, and from the same viewpoint, preferably 0.0100% by mass or less, more preferably 0.0050% by mass or less, and even more preferably 0.0010% by mass or less.
[0077] In the above-mentioned cleaning method, the total content of component (a), component (b), and component (c) in the cleaning solution is preferably 0.00551% by mass or more and 0.61% by mass or less, more preferably 0.0080% by mass or more and 0.08% by mass or less, and even more preferably 0.0100% by mass or more and 0.05% by mass or less, from the viewpoint of improving cleaning performance during use (during cleaning, during washing).
[0078] The temperature of the cleaning solution is preferably 0°C or higher, more preferably 5°C or higher, from the viewpoint of improving the cleaning performance of sebum stains and other dirt attached to clothing products containing fibers, regardless of whether the temperature is low or high. Similarly, it is preferably 90°C or lower, more preferably 70°C or lower, and even more preferably 60°C or lower. Furthermore, from the viewpoint of reducing environmental impact, it is preferably 40°C or lower, more preferably 30°C or lower.
[0079] In the cleaning method of the present invention, the pH during cleaning is preferably 9 or higher, more preferably 9.2 or higher, from the viewpoint of improving cleaning performance, and similarly, preferably 11 or lower, more preferably 10.5 or lower.
[0080] The present invention will be described in detail below based on examples.
[0081] <Ingredients> The following ingredients were used in the examples and comparative examples described in Table 1.
[0082] AES(1): Sodium oxyethylene (average number of moles of ethylene oxy groups: 1) lauryl ether sulfate AES(2): Sodium oxyethylene (average number of moles of ethylene oxy groups: 2) lauryl ether sulfate APES: Sodium (oxypropylene) oxyethylene lauryl ether sulfate, with an average of 2 moles of propylene oxy groups and 2 moles of ethylene oxy groups AE(10): Oxyethylene (average number of moles of ethylene oxy groups: 10) alkyl (12-14 carbon atoms) ether APE: Sodium (oxypropylene) oxyethylene lauryl ether, with an average of 4 moles of propylene oxy groups and 17 moles of ethylene oxy groups C16IOS: Potassium internal olefin sulfonate with 16 carbon atoms (manufactured with reference to the manufacturing method described in Japanese Patent Publication No. 2014-76988. Specifically, the mass ratio of hydroxyalkane sulfonate / olefin sulfonate is 83 / 17, and the mass percentage of the positional distribution of sulfonic acid groups of the hydroxyalkane sulfonate is 1st / 2nd / 3rd / 4th / 5th / 6th-8th = 2.3% by mass / 23.6% by mass / 18.9% by mass / 17.5% by mass / 13.7% by mass / 24% by mass (total 100% by mass)) C12AO: Lauryldimethylamine oxide LAS: Sodium linear alkylbenzene sulfonate, alkyl group with 10-14 carbon atoms Lipase: Lipex eviity 100L (manufactured by Novozymes, effective content 5% by mass) MEA: Monoethanolamine protease: Progress Uno 100L (Novozymes, 10% by mass of effective content) BDG: Butyl diglycol Water: Ion-exchanged water
[0083] <Preparation of Liquid Laundry Detergent Compositions> Based on the formulations shown in Table 1, the liquid laundry detergent compositions for the examples and comparative examples were specifically prepared as follows. Note that the content percentage (mass%) in the composition in Table 1 indicates the effective content. For each liquid laundry detergent composition, the formulation components excluding lipase, protease, and fragrance shown in Table 1 were weighed in proportion to 1000 g of the liquid laundry detergent composition, and the formulation components were mixed in a stainless steel beaker (capacity 2 L) using a Three One Motor (manufactured by Shinto Kagaku Co., Ltd.) to obtain a mixture. Deionized water heated to 70°C was used. After the temperature of the mixture had fallen to 40°C or below, fragrance, (if included in Table 1) lipase, and protease were added, and the mixture was stirred at room temperature (25°C) to obtain each liquid laundry detergent composition.
[0084] <Preparation of Model Sebum Artificial Contaminated Cloth> Model sebum artificial contaminated cloth was prepared by applying a model sebum artificial contaminated solution of the following composition to a cloth. The model sebum artificial contaminated solution was applied to the cloth by printing the artificial contaminated solution onto the cloth using a gravure roll coater. The process of applying the model sebum artificial contaminated solution to the cloth and preparing the model sebum artificial contaminated solution was performed using a gravure roll with a cell capacity of 58 cm². ３ / m ２ The coating was applied at a speed of 1.0 m / min, with a drying temperature of 100°C and a drying time of 1 min. A 6 x 6 cm cotton / polyester broadcloth blend fabric (cotton / polyester ratio = 35 / 65, purchased from Tanigashira Shoten) was used. Composition of the artificial sebum contamination solution: Lauric acid 0.4% by mass, myristic acid 3.1% by mass, pentadecanoic acid 2.3% by mass, palmitic acid 6.2% by mass, heptadecanoic acid 0.4% by mass, stearic acid 1.6% by mass, oleic acid 7.8% by mass, triolein 13.0% by mass, n-hexadecyl palmitate 2.2% by mass, squalene 6.5% by mass, egg white lecithin liquid crystal 1.9% by mass, Kanuma red clay 8.1% by mass, carbon black 0.01% by mass, water residue (total 100% by mass)
[0085] <Cumulative Sebum Stain Cleaning Test (Cumulative Cleaning Power)> Four artificial sebum-stained model cloths prepared as described above were used as a set and washed for 10 minutes at 100 rpm using a Turgotometer (Ueshima, MS-8212). The washing conditions were as follows: the liquid laundry detergent composition described in Table 1 was added to water prepared to a German hardness of 5°dH at a concentration of 0.1% by mass (1000-fold dilution) to create the cleaning solution, and washing was carried out at a water temperature of 30°C. After washing, the cloths were rinsed for 3 minutes with water under the same conditions as during washing, and then left to stand at room temperature for 16 hours to dry. The cumulative cleaning power was evaluated by repeating this process three times. The cleaning rate (%) was calculated by measuring the reflectance at 550 nm of the original cloth before washing and before and after washing using a colorimeter (Nippon Denshoku Co., Ltd., Z-300A) and using the method described below. Cleaning rate (%) = 100 × [(Reflectance after 3 washes - Reflectance before washing) / (Reflectance of the original fabric - Reflectance before washing)]. The cleaning rate is preferably 60% or more, more preferably 62% or more, and even more preferably 65% or more, from the viewpoint of improving cumulative cleaning power.
[0086] <Low-Temperature Stability Evaluation> 100 g of the liquid laundry detergent composition was filled into a 100 mL plastic container (manufactured by JP Bottle Nikko Hansen) and stored at 5°C for 20 days. After storage, the appearance of the liquid laundry detergent composition was observed at 5°C. (Evaluation Criteria) ○ (Pass): No turbidity, crystal precipitation, or liquid separation was observed. × (Fail): Turbidity, crystal precipitation, or liquid separation was observed.
[0087]
[0088] From the evaluation results in Table 1 above, it was confirmed that all examples simultaneously satisfied both cumulative cleaning power and low-temperature stability. On the other hand, in Comparative Examples 1-3 and 5-7, no improvement in cumulative cleaning power was observed compared to the examples when component (b) was not included or when component (c) was not included. Furthermore, in Comparative Example 4, when the amount of component (b) used exceeded the desired range, precipitation was observed at low temperatures (5°C x 20 days), confirming poor low-temperature stability.
Claims
1. A liquid laundry detergent composition containing (a) 5% by mass or more and 20% by mass of a surfactant, (b) 0.5% by mass or more and 10% by mass of an inorganic alkali salt, and (c) 0.0025% by mass or more of lipase, with a pH greater than 9 at 25°C.
2. The liquid laundry detergent composition according to claim 1, wherein the surfactant (a) is one or more surfactants selected from nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants.
3. The liquid laundry detergent composition according to claim 1 or 2, wherein the (b) inorganic alkali salt comprises one or more selected from the group consisting of carbonates, bicarbonates, silicates, and tripolyphosphates.
4. A liquid laundry detergent composition according to any one of claims 1 to 3, wherein the mass ratio (c) / (a) of the content of (c) lipase to the content of (a) surfactant is 0.000125 or more.
5. A liquid laundry detergent composition according to any one of claims 1 to 4, wherein the mass ratio (c) / (b) of the content of (c) lipase to the content of (b) inorganic alkali salt is 0.00025 or more.
6. A liquid laundry detergent composition according to any one of claims 1 to 5, wherein the mass ratio (b) / (a) of the content of the surfactant (a) to the content of the inorganic alkali salt (b) is 0.025 or more and 2 or less.
7. A liquid laundry detergent composition according to any one of claims 1 to 6, wherein the content of (a) the surfactant is 5% by mass or more and 18% by mass or less, and the content of (b) the inorganic alkali salt is 0.5% by mass or more and 8% by mass or less.
8. A liquid laundry detergent composition according to any one of claims 1 to 6, wherein the content of (a) the surfactant is 5% by mass or more and 16% by mass or less, and the content of (b) the inorganic alkali salt is 0.5% by mass or more and 8% by mass or less.
9. The liquid laundry detergent composition according to any one of claims 1 to 6, wherein the content of (a) the surfactant is 5% by mass or more and 16% by mass or less, and the content of (b) the inorganic alkali salt is 0.5% by mass or more and 6% by mass or less.
10. A method for washing clothes, comprising contacting the clothes with a washing solution containing (a) 0.005% by mass or more and 0.4000% by mass or less of a surfactant, (b) 0.0005% by mass or more and 0.2000% by mass or less of an inorganic alkali salt, and (c) 0.0000005% by mass or more of lipase.