JP2008222971A - Detergent composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detergent composition for clothing which contains a specific polymer making difficult the re-attachment of soot stains or dust stains having been released from clothing i.e. preventing the clothing from being re-stained, and further a detergent composition for clothing which prevents re-staining even in use of clothing or towels having been treated with a softener in a rinse cycle. <P>SOLUTION: The detergent composition comprises (a) a copolymer which has a constitutional unit derived from N-vinyl pyrolidone and a constitutional unit derived from N-vinyl imidazole in a mole ratio (N-vinyl pyrolidone/N-vinyl imidazole) in the copolymer of 10/90-50/50 and a weight average molecular weight of 10,000-100,000, (b) a nonionic surfactant containing a polyoxyalkylene alkyl ether and (c) a polyethylene glycol having a weight average molecular weight of 2,000-20,000. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laundry detergent composition.

  In recent years, a water-saving type washing machine, that is, a washing machine with a small amount of water used for washing, has become widespread due to an increase in environmental awareness. A prominent example is a washing machine generally called a drum type washing machine, which is widely accepted all over the world. However, the cleaning system that uses a small amount of water for the object to be cleaned has a problem that the object to be cleaned is darkened by washing. Although it is preferable to reduce washing water from the viewpoints of reducing environmental load and saving economy through energy saving, it is thought that “darkening” of objects to be cleaned is due to the fact that the amount of water used is small as described below. Therefore, improvement by the washing machine itself is a difficult task. Therefore, at the present time when water-saving type washing machines are becoming widespread, even in such a washing system with a small amount of water used, a detergent composition that not only exhibits high detergency but also can suppress darkening of the object to be washed, There is a strong demand.

  As a main factor of the phenomenon in which the object to be cleaned becomes darker every time washing is performed, a phenomenon in which coloring components such as dirt that has separated from the object to be cleaned in the cleaning process re-adheres to the object to be cleaned in the washing water. When the amount of washing water decreases, the concentration of dirt in the washing water increases, so that these redepositions easily occur. Even if the amount of water decreases, even if the detergent and dispersant concentration in the washing liquid becomes high as well as dirt, the concentration of the anti-redeposition prevention by these components is more than an increase in the positive effect. Since the negative effect of increasing the concentration of dirt in the water is large, it can also be confirmed that promotion of redeposition of dirt on the object to be cleaned occurs.

  Further, among the stains in the washing liquid, representative examples of the coloring component include hydrophilic fine particles contained in mud and hydrophobic fine particles such as soot. In order to prevent darkening, a detergent composition having a high anti-adhesion property is necessary for the fine dirt particles having different physical properties.

  Conventionally, as a technique for preventing the reattachment of dirt, as disclosed in Patent Document 1, a technique for improving the dispersibility of dirt in a washing liquid using a dispersing agent such as a polymer is known.

  Further, as a technique based on a mechanism different from this, there is a technique for preventing the redeposition of dirt by changing the surface physical properties of the fiber by adsorbing a specific chemical species to the fiber. For example, Patent Document 2 describes that smectite-type clay minerals are adhered to fibers to improve the anti-reattachment property of dirt. However, in the case of Patent Document 2, there is no suggestion of a mechanism that stably disperses dirt particles in the washing liquid in the anti-redeposition mechanism in which an effect appears due to the adhesion of a chemical species. When the adhesion is not good, the effect hardly appears. In particular, since there is no suggestion regarding surfactants, particularly nonionic surfactants, the performance for preventing redeposition of soot-like hydrophobic fine particles which seems to be an important factor for preventing darkening is not sufficient. . In addition, this mechanism is not sufficient to prevent darkening in a high soil concentration solution in which blackening is recognized even after one washing because repeated washing is a necessary condition for manifesting the effect. .

  Moreover, as a technique using a smectite-type clay mineral, there is an example of using a clay mineral in order to improve the particle physical properties of a detergent composition containing a nonionic surfactant, as in Patent Document 3. However, in the case of Patent Document 3, since there is no technical idea to prevent darkening of the object to be cleaned, the content of the anionic surfactant is not sufficient, which is one of the causes of darkening. Such re-adhesion preventing property of hydrophilic fine particles is not sufficient.

  In addition, a technique for applying an amphoteric polymer having a cationic group and an anionic group to a detergent composition for clothing and performing an antifouling treatment in a washing machine washing process is already known. Can be helpful. However, although it has a high cleaning effect against sebum stains during washing, it does not have sufficient anti-reattachment properties for hydrophobic fine particles such as hydrophilic fine particles and soot contained in mud due to dirt in the washing liquid. .

Neither of these techniques is sufficient to prevent redeposition of dirt in washing water having an extremely increased dirt concentration due to the small amount of washing water as described above.
JP-A-62-253694 JP 56-167798 A Japanese Patent No. 3043976 Japanese Patent No. 3405941

  Laundry clothes that have been worn are washed with a laundry detergent and a fully automatic washing machine. Although it is a cycle, the oleophilicity of the fiber surface of the garment becomes stronger as the processing of the softener is repeated. Therefore, there is a problem that so-called “dirt re-contamination” is liable to occur, such as heel stains and dust stains that are once separated from the clothing.

  In recent years, fully automatic washing machines have been rapidly saving water, and as a result, the amount of water for clothes is low, that is, washing is performed at a low bath ratio, so the concentration of dirt increases, and these problems occur frequently. Cheap. In particular, the popularity of drum-type washing machines with a low bath ratio has been increasing year by year in the washing machine market, and complaints from users of drum-type washing machines have become prominent.

  An object of the present invention is to provide a laundry detergent composition containing a specific polymer that makes it difficult to reattach scum stains and dust stains once detached from clothing, that is, prevents recontamination of stains. Furthermore, it is an object of the present invention to provide a detergent composition for clothing that prevents recontamination of dirt even when clothes or cotton towels treated with a softening finish are used in the rinsing step.

The present invention
[1] (a) A copolymer having a structural unit derived from N-vinylpyrrolidone and a structural unit derived from N-vinylimidazole, wherein the molar ratio in the copolymer [N-vinylpyrrolidone / N- Vinylimidazole] is 10/90 to 50/50, and a copolymer having a weight average molecular weight of 10,000 to 100,000,
(B) a nonionic surfactant containing a polyoxyalkylene alkyl ether, and (c) a polyethylene glycol having a weight average molecular weight of 2,000 to 20,000,
A detergent composition containing [2], and a method for preventing recontamination of soil by bathing a textile product with an aqueous solution containing 1 to 2000 ppm of the detergent composition according to [1],
About.

  By using the detergent composition of the present invention, high dirt recontamination prevention performance can be imparted when washing textiles and the like.

  The detergent composition of the present invention contains a copolymer having a structural unit derived from N-vinylpyrrolidone and a structural unit derived from N-vinylimidazole. In the present specification, the copolymer may hereinafter be simply referred to as “N-vinylpyrrolidone / N-vinylimidazole copolymer”.

<(A) N-vinylpyrrolidone / N-vinylimidazole copolymer>
The weight average molecular weight of the N-vinylpyrrolidone / N-vinylimidazole copolymer of the present invention is 10,000 to 100,000, preferably 55,000 to 100,000, more preferably from the viewpoint of enhancing the recontamination prevention performance. Is 60,000-80,000.

  The weight average molecular weight is usually measured using gel permeation chromatography (GPC). Specifically, DMF (N, N-dimethylformamide) is used as a solvent, and polyethylene glycol (PEG) is used as a standard substance. Examples include Showa Denko GPC (organic solvent column: Shodex Asahipac series GPC KD-803 or GPC KD-804), RI detector (RI-71,101, Showa Denko), UV detector (UV-41, Showa Denko), etc. Can be used to determine the weight average molecular weight.

  The N-vinylpyrrolidone / N-vinylimidazole copolymer (PVP / PVI copolymer) can be copolymerized by a production method using a radical initiator described in Japanese Patent No. 3272359, Japanese Patent No. 3327362, and the like.

  Furthermore, in addition to the ability to prevent recontamination of dirt, the ability to prevent recontamination of certain detergent components (sodium polyacrylate, polyethylene glycol, etc.) is also due to the presence of the N-vinylpyrrolidone / N-vinylimidazole copolymer of the present invention. Strengthened. The molar ratio of the structural unit derived from N-vinylpyrrolidone and the structural unit derived from N-vinylimidazole [N-vinylpyrrolidone / N-vinylimidazole] in the copolymer is a viewpoint of more effectively improving the recontamination prevention performance. From 10/90 to 50/50, preferably from 20/80 to 50/50, more preferably from 30/70 to 40/60. The N-vinylpyrrolidone / N-vinylimidazole copolymer may be a chain type or a branched type. The amount of the N-vinyl pyrrolidone / N-vinyl imidazole copolymer present in the detergent composition is such that the dirt fine particles are stably dispersed in the washing liquid and the dirt is prevented from adhering to the fibers. Preferably it is 0.01-10 mass%, More preferably, it is 0.05-5 mass%, More preferably, it is 0.1-1 mass%.

<(B) Nonionic surfactant>
The nonionic surfactant used in the present invention contains a polyoxyalkylene alkyl ether. In particular, from the viewpoint of improving the recontamination prevention performance and the overall detergency for hydrophobic fine particles such as carbon, the component (b) is preferably 10 to 18 carbon atoms, more preferably 10 to 16 carbon atoms, More preferably, polyoxyalkylene alkyl obtained by adding an alkylene oxide of ethylene oxide or propylene oxide to an alcohol having 10 to 15 carbon atoms in an average of preferably 4 to 10 mol, more preferably an average of 4 to 9 mol, and further preferably an average of 5 to 7 mol. Nonionic surfactants containing ether are preferred.

  Condensation products of primary and secondary aliphatic alcohols with about 4-10 moles of ethylene oxide are suitable for use in the present invention. The alkyl chain of the aliphatic alcohol may be linear or branched, and may be first or second, and generally has 10 to 18 carbon atoms. More preferably, the alcohol having an alkyl group having 10 to 16 carbon atoms, more preferably 10 to 15 carbon atoms, and preferably about 4 to 10 moles per mole of alcohol, more preferably 4 to 9 moles on average, still more preferably Is a condensation product of an average of 5 to 7 moles of ethylene oxide.

  Examples of commercially available nonionic surfactants are Tergitol ™ 15-S-9 (condensation product of C11 to C15 linear alcohol and 9 moles of ethylene oxide), both commercially available from Union Carbide Corporation, Tergitol ™ 24- L-6 NWL (condensation product with a narrow molecular weight distribution of C12-C14 primary alcohol and 6 moles of ethylene oxide), Neodol ™ 45-9 (condensation of C14-C15 straight chain alcohols with 9 moles of ethylene oxide from Shell Chemical Company) Product), NeodolTM 23-6.5 (condensation product of C12-C13 linear alcohol and 6.5 moles of ethylene oxide), NeodolTM45-7 (condensation product of C14-C15 linear alcohol and 7 moles of ethylene oxide), NeodolTM45- 4 (condensation product of C14 to C15 linear alcohol with 4 moles of ethylene oxide), and Emulgen 108 (C12 alcohol with about 6 moles of ethylene) available from Kao Condensation products of Kishido) can be mentioned.

  The amount of the nonionic surfactant is preferably 10 to 30% by mass, more preferably 10 to 20% by mass, and still more preferably 10 to 10% by mass in the detergent composition from the viewpoint of enhancing the detergency and recontamination prevention performance. 15% by mass. In particular, the polyoxyalkylene alkyl ether is preferably 50 to 100% by mass in the nonionic surfactant from the viewpoint of improving the recontamination prevention performance and the overall detergency for hydrophobic fine particles such as carbon. Preferably it is 60-100 mass%, More preferably, it is 80-100 mass%.

  The mass ratio [(a) / (b)] of the component (a) and the component (b) in the detergent composition is a viewpoint that stably disperses the dirt particles in the washing liquid and prevents the dirt from adhering to the fibers. Therefore, it is preferably 1/100 to 1/1, more preferably 1/100 to 1/20, still more preferably 1/50 to 1/20, and even more preferably 1/40 to 1/20.

<Other surfactants>
As the surfactant other than the component (b) used in the present invention, a conventionally known substance can be used. Among them, it is preferable to use an anionic surfactant as the main surfactant.

  Examples of the anionic surfactant include linear alkylbenzene sulfonate having alkyl chain having 10 to 18 carbon atoms, alkyl sulfate ester salt, polyoxyalkylene alkyl ether sulfate salt, alpha sulfo fatty acid methyl ester salt, N-acyl. Amino acid surfactants, alkyl or alkenyl ether carboxylates, amino acid surfactants, alkali metal salts such as alkyl or alkenyl phosphate esters or salts thereof are preferred, and even if fatty acid salts derived from beef tallow or coconut oil are blended Good. Of these, alkylbenzene sulfonate, alkyl sulfate ester salt, and polyoxyalkylene alkyl ether sulfate are more preferable, and sodium alkylbenzene sulfonate is particularly preferable. The content of the anionic surfactant in the detergent composition is preferably 10% by mass or more, particularly 11% by mass, from the viewpoint of improving the recontamination preventing performance and the overall detergency for hydrophilic fine particles such as mud. % Or more is more preferable. Moreover, from a viewpoint of powder physical property, 40 mass% or less is preferable, 35 mass% or less is more preferable, 30 mass% or less is further more preferable, and 26 mass% or less is further more preferable.

  Further, as the nonionic surfactant other than the component (b), higher fatty acid alkanolamides, sucrose fatty acid esters, alkylglycosides, and fatty acid glycerin monoesters can be used. These nonionic surfactants have good resistance to hard water and have a remarkable detergency for oily dirt such as sebum dirt. From the viewpoint of foamability and rinsability, the use of 15% by mass or less is preferable. In the present invention, the content of the nonionic surfactant other than the component (b) is particularly preferable in the detergent composition from the viewpoint of enhancing the recontamination prevention performance and the overall detergency for hydrophobic fine particles such as carbon. 5 mass% or less is preferable, 2 mass% or less is more preferable, 1 mass% or less is further more preferable, and it is most preferable not to contain. Further, the molar ratio of the polyoxyethylene alkyl ether type nonionic surfactant to the polyethylene oxide contained in the detergent composition (polyoxyethylene alkyl ether type nonionic surfactant / polyethylene oxide) is 20 or less. Preferably, 10 or less is more preferable, and 7 or less is more preferable.

  In the detergent composition of the present invention, surfactants such as betaine amphoteric surfactants, phosphate ester surfactants, soaps and cationic surfactants can be appropriately blended.

<(C) Polyethylene glycol>
The polyethylene glycol used in the present invention has an action of dispersing solid particle soil in the washing liquid. In particular, a weight average molecular weight of 20,000 or less is preferable (polyethylene glycol having a high molecular weight works as a flocculant, and the higher the molecular weight, the lower the recontamination prevention performance). The weight average molecular weight of the component (c) of the detergent composition is particularly preferably from 2,000 to 20 from the viewpoint of effectively enhancing the dispersion performance in the washing bath and the recontamination prevention performance with respect to hydrophobic fine particles such as carbon. 5,000, preferably 5,000 to 15,000, more preferably 8,000 to 13,000. The content of polyethylene glycol is preferably 1 to 2% by mass, more preferably 1 to 1.5% by mass in the detergent composition from the viewpoint of anti-recontamination performance and improved caking resistance in powder detergent systems. .

<(D) Bleach: Compound that releases hydrogen peroxide in water>
The detergent composition of the present invention may preferably contain 0.5 to 20% by mass of a compound that releases hydrogen peroxide in water as the component (d), that is, a bleaching agent. The content of the component (d) in the detergent composition is more preferably 1.5 to 20% by mass, further preferably 2 to 13% by mass, and more preferably 2 to 10% by mass in terms of recontamination prevention performance and cleaning performance. Is more preferable, and 2 to 8% by mass is even more preferable.

  (D) Component types include carbonate / hydrogen peroxide adduct, borate / hydrogen peroxide adduct, tripolyphosphate / hydrogen peroxide adduct, pyrophosphate / hydrogen peroxide adduct, urea / peroxide Examples include hydrogen oxide adducts. Among these, carbonate / hydrogen peroxide adduct and borate / hydrogen peroxide adduct are preferable, and sodium carbonate / hydrogen peroxide adduct and sodium borate / hydrogen peroxide adduct are more preferable. Sodium borate / hydrogen peroxide adduct is more preferable in terms of cleaning performance at high temperatures, and sodium carbonate / hydrogen peroxide adduct is more preferable in terms of cleaning performance at low temperatures.

  The component (d) is preferably coated with an inorganic compound, an organic compound or the like from the viewpoint of storage stability. Examples of the inorganic compound used include boric acid, borate, sodium carbonate, sodium sulfate, magnesium sulfate, magnesium silicate, magnesium chloride, magnesium oxide, and sodium silicate. Organic compounds include polyethylene glycol, polyvinyl pyrrolidone, and hydroxypropyl. A cellulose etc. are mentioned. Among these, it is preferable to coat with at least boric acid or borate. Examples of boric acid include orthoboric acid, metaboric acid, and tetraboric acid. Examples of the salt include alkali metal salts such as sodium and potassium.

  The coating of the component (d) using the inorganic compound or the organic compound can be performed, for example, by the method described in JP-A-59-196399. As a quantity of (d) component, 50-95 mass% is preferable in the particle | grains containing (d) component, and 70-90 mass% is more preferable. The amount of the inorganic compound or organic compound used for coating is 0.5 to 20 mass in terms of stability and solubility in the case where the component (d) is used as particles containing the component (d). % Is preferable, and 1 to 10% by mass is more preferable. In addition, conventionally known stabilizers, dissolution accelerators, chelating agents, and the like may be included in the particles. Among them, it is preferable to use chloride, urea, anionic surfactant, and nonionic surfactant from the viewpoint of solubility, and the ratio thereof is preferably 0.1 to 5% by mass in the particles.

〔式中、Ｒ¹は炭素数４〜１３のアルキル基、Ｒ²は炭素数５〜１３のアルキル基、Ｍは水素原子又はアルカリ金属原子、アルカリ土類金属原子、アンモニウム若しくはアルカノールアミンを示し、Ｍがアルカリ土類金属原子の場合、ｎは２、Ｍが水素原子、アルカリ金属原子、アンモニウム若しくはアルカノールアミンの場合、ｎは１である。〕 <(E) Bleach activator: organic peracid precursor>
The detergent composition of the present invention preferably contains 0.1 to 20% by mass of the bleach activator represented by the following general formula (1) and / or (2) as the component (e). In terms of anti-recontamination performance and cleaning performance, the component (e) in the detergent composition is more preferably 0.1 to 10% by mass, still more preferably 0.3 to 10% by mass, and 0.5 to 10% by mass. % Is still more preferable, and 0.5 to 8% by mass is particularly preferable.

[Wherein, R ¹ represents an alkyl group having 4 to 13 carbon atoms, R ² represents an alkyl group having 5 to 13 carbon atoms, M represents a hydrogen atom or an alkali metal atom, an alkaline earth metal atom, ammonium or alkanolamine, When M is an alkaline earth metal atom, n is 2, and when M is a hydrogen atom, an alkali metal atom, ammonium or alkanolamine, n is 1. ]

In the general formulas (1) and (2), R ¹ and R ² are preferably an alkyl group or an alkenyl group having 7 to 18 carbon atoms, more preferably 8 to 13 carbon atoms, from the viewpoint of cleaning performance. More preferably an alkyl group having 9 to 13 carbon atoms, particularly preferably an alkyl group having 10 to 13 carbon atoms. Moreover, as M, an alkali metal atom is preferable, and sodium and potassium are preferable, and sodium is particularly preferable.

The component (e) may be a compound that reacts with hydrogen peroxide in water (specifically, hydrogen peroxide released from the component (d)) to generate an organic peracid. The organic peracid is a peroxide generated by a reaction between the component (e) and hydrogen peroxide derived from the component (d).
(E) When mix | blending a component in a detergent composition, it is preferable to mix | blend as a granulated particle containing a (e) component from a stability point. The amount of the component (e) in the granulated particles containing the component (e) is preferably 1 to 80% by mass, more preferably 20 to 80% by mass, and still more preferably 30 to 75% by mass. The granulated particles containing the component (e) are selected from polyoxyalkylene alkyl ethers, alkyl sulfates and polyoxyalkylene alkyl ether sulfates in order to improve the solubility of the component (e) in the washing liquid. The granulated particles containing the component (e) preferably contain 0 to 50% by mass, more preferably 1 to 45% by mass, and still more preferably 2 to 40% by mass. .

  The polyoxyalkylene alkyl ether is preferably one in which ethylene oxide and propylene oxide are added in a block form, the ethylene oxide average addition mole number is preferably 3 to 20, more preferably 4 to 15, and the propylene oxide average addition mole number is 1 to 1. 10 is preferable and 2-7 are more preferable. 10-18 are preferable and, as for carbon number of an alkyl group, 12-16 are more preferable.

The alkyl sulfate has 10 to 18 carbon atoms and is preferably a sodium salt, more preferably sodium lauryl sulfate or sodium myristyl sulfate.
The polyoxyalkylene alkyl ether sulfate is preferably a polyoxyethylene alkyl ether sulfate having an alkyl group having 10 to 18 carbon atoms, and more preferably a sodium salt thereof. Here, the average degree of polymerization (hereinafter referred to as EOp) of the polyoxyethylene group is preferably 1 to 10, more preferably 1 to 5, and polyoxyethylene (EOp / 2 to 5) sodium lauryl ether sulfate, polyoxyethylene ( EOp / 2-5) Sodium myristyl ether sulfate is good.
(E) The granulated particle containing a component may be prepared by formulating the above component using a binder substance selected from polyethylene glycol and fatty acid.

The polyethylene glycol preferably has a weight average molecular weight of 2,000 to 20,000, more preferably a weight average molecular weight of 4,000 to 15,000, and still more preferably a weight average molecular weight of 4,000 to 13,000. is there. The fatty acid preferably has 8 to 20 carbon atoms, more preferably 10 to 18 carbon atoms, and still more preferably 12 to 18 carbon atoms, and these may be in the form of sodium or potassium soap.
The binder material is preferably used in the granulated particles containing the component (e) in an amount of 0.5 to 30% by mass, more preferably 1 to 20% by mass, and still more preferably 5 to 20% by mass. In the granulated particles containing the component (e), it is preferable in terms of storage stability that the above composition is blended in the above ratio.

  Moreover, in this invention, you may mix | blend an acidic substance in the granulated particle containing (e) component depending on necessity in order to further improve the stability of the granulated particle containing (e) component. As the acidic substance, organic carboxylic acids are preferable, and at least one selected from succinic acid, maleic acid, fumaric acid, citric acid, glycolic acid and p-hydroxybenzoic acid is more preferable. The blending amount of such an acidic substance is preferably 0 to 20% by mass, more preferably 1 to 15% by mass, and further preferably 1 to 10% by mass in the granulated particles containing the component (e). .

  The granulated particles containing the component (e) can be obtained by mixing the above components by any method, but further, the component (e) and a part or all of the surfactant are mixed first, A method of adding the remaining surfactant, binder substance, acidic substance or the like is preferred. Further, it is preferable to add the binder substance after dissolving it in advance. The binder material is preferably added after being melted at 40 to 100 ° C, more preferably 50 to 100 ° C, and still more preferably 50 to 90 ° C. The mixture obtained as described above may be stirred and mixed until uniform, and then formulated with a normal granulator.

  Extrusion granulation can be mentioned as a preferred granulation method, and an average particle diameter is preferably 200 to 5000 μm, more preferably 500 to 3000 μm. As another granulation method, a tablet shape by a briquetting machine can be cited as a preferable granulation method.

  The mass ratio of the component (d) to the component (e) [(d) / (e)] is preferably 3/4 to 20/1, more preferably 1/1, from the viewpoint of effectively exhibiting bleaching performance. To 10/1, more preferably 5/3 to 8/1.

<(F) Other polymer>
In addition, the detergent composition of the present invention and the washing liquid used in the present invention preferably have a weight average molecular weight of less than 500,000, more preferably a weight average molecular weight, which has been conventionally known for the purpose of enhancing the dispersibility of solid particle soil. 1,000 to 100,000 organic polymers such as a carboxylic acid polymer and carboxymethyl cellulose can be blended.

<(F-1) Carboxylic acid polymer>
Carboxylic acid polymers have a function of sequestering metal ions, and also have an effect of dispersing solid particle dirt in the washing liquid. The carboxylic acid polymer may be a homopolymer or copolymer such as acrylic acid, methacrylic acid, and itaconic acid. The homopolymer is polyacrylic acid or polyacrylic acid soda salt, and the copolymer is the above. Those obtained by copolymerizing a monomer and maleic acid are preferred, and those having a weight average molecular weight of 3000 to 20,000 are preferred.

<(F-2) Carboxymethylcellulose>
Carboxymethylcellulose has the effect of dispersing solid particle soil in the washing liquid. From the viewpoint of dispersibility, those having a weight average molecular weight of several thousand to several hundred thousand and an etherification degree of 0.2 to 1.0 are preferable.

<(G) Alkaline agent>
As the alkaline agent used in the present invention, a conventionally known alkaline agent is preferably blended. From the standpoint of detergency, it is preferable that the alkaline agent is added to the detergent composition later. Examples of the alkali agent include alkali metal carbonates such as sodium carbonate collectively called dense ash and light ash, amorphous alkali metal silicates such as JIS No. 1, No. 2, No. 3 sodium silicate, and crystalline alkali. Examples include alkali metal salts such as metal silicates. The content of the alkaline agent in the detergent composition is preferably 5% by mass or more, more preferably 10% by mass or more, and more preferably 15% by mass or more from the viewpoints of improving oil stains such as sebum and improving the solubility of the powder detergent. Is more preferable, and 40% by mass or less is preferable.

<(H) sequestering agent>
As a builder, it is very effective from the standpoint of detergency to mix a sequestering agent in the detergent composition and capture the hardness component in the wash water. In particular, it is more effective to add a sequestering agent having a calcium ion scavenging ability of 100 mgCaCO ₃ / g or more. Examples of the sequestering agent include crystalline aluminosilicate, crystalline sodium silicate, acrylic acid polymer, acrylic acid-maleic acid copolymer, sodium tripolyphosphate, ethylenediaminetetraacetic acid, and methylglycine diacetic acid. However, sodium carbonate and amorphous sodium silicate are not included in the sequestering agent in the present invention. The content of the sequestering agent in the detergent composition is preferably 1% by mass or more, more preferably 5% by mass or more, further preferably 10% by mass or more, and even more preferably 20% by mass or more from the viewpoint of detergency. preferable. Moreover, from a viewpoint of the balance of a mixing | blending, 50 mass% or less is preferable, 40 mass% or less is more preferable, and 35 mass% or less is further more preferable.

<(I) Other additives>
In the detergent composition of the present invention, enzymes, fragrances, fluorescent dyes, pigments and the like can be appropriately blended.

  The form which implements the detergent composition of this invention has a preferable powder form, and the density | concentration in the bath at the time of laundry use becomes like this. Preferably it is 10-2000 ppm, More preferably, it is 200-2000 ppm, More preferably, it is 300-2000 ppm.

  The present invention relates to a method for preventing soil recontamination by bathing a textile product with an aqueous solution containing 10 to 2000 ppm of the detergent composition. The concentration of the detergent composition is preferably 200 to 2000 ppm, more preferably 300 to 2000 ppm, in the aqueous solution, from the viewpoint of effective expression of detergency and anti-recontamination performance and rinsing properties.

  In the present invention, the object for preventing recontamination of dirt is preferably a textile product, for example, a yarn bundle, clothing including a fabric, a bag, or the like, and more preferably clothing.

Preparation of treatment cloth The treatment to the test cloth was performed using accumulating detergent (New Beads) at 0.083% by weight, and the test cloth was subjected to cumulative washing treatment five times using a fully automatic washing machine / standard course. . The treated cloth was dried and conditioned for 14 hours in a constant temperature room (25 ° C./40% RH). The size of each test cloth was 4 × 5 cm.
In addition, the bath treatment conditions were a fully automatic washing machine JW-Z20A manufactured by Haier Co., Ltd., standard course / washing 15 minutes, rinsing twice, dehydration 5 minutes (each water amount 15 L, water temperature 20 ° C., bath ratio 40) It is.

<Test cloth>
Cotton knitted fabric (fluorescent dye-undyed fabric), T / C broad (fluorescent dye-dyed fabric), and polyester knit were all obtained from Tanigami Shoten Co., Ltd.

Evaluation method of anti-recontamination effect The anti-contamination effect was evaluated using a round-ometer.
The detergent composition for clothing shown in Table 1 was dissolved in 100 mL of 72 mg / L (CaCO ₃ equivalent) of hard calcium water and adjusted to 0.15%. Next, 0.13 g of carbon is put into the aqueous solution and dispersed by irradiating with ultrasonic waves for 15 minutes using a bathtub of an ultrasonic oscillator (model U0600PB-Y manufactured by Kokusai Electric Eltech Co., Ltd.). Moved to.

  Three kinds of treated cloths each having a size of 4 x 5 cm, one of which is a set of 5 sheets in a set of 15 sheets, put in a bath solution in the cup, and at 25 ° C for 30 minutes, pot rotation speed 40 ± 2 Washing was carried out by rotating with a round-ometer at times / minute. After rinsing with 5 L of tap water, an iron press treatment was performed. Subsequently, the reflectance at 550 nm of the raw cloth before washing and the recontamination test cloth was measured with a spectral color difference meter SE2000 manufactured by Nippon Denshoku Industries Co., Ltd., and the recontamination prevention rate (%) was calculated from the following formula.

Prevention rate of recontamination (%) = [Reflectance after cleaning / Reflectivity of fabric] × 100

Composition Example of Detergent Composition A detergent base was obtained with ingredients excluding bleach, bleach activator, enzyme, perfume and 3% by weight of surface modifying zeolite. This was mixed with the remaining ingredients to obtain a detergent composition. The composition of the detergent composition is shown in Table 1.

All of the obtained detergent compositions have a pH range of 10 to 11 and a calcium capture amount of 50 CaCO ₃ mg / g to 200 CaCO ₃ mg as measured at 20 ° C. described in JIS K3362: 1998. / G range, average particle size was in the range of 300-800 μm, and apparent density was in the range of 700-980 g / L.

In the examples, the following were used as each component.
-PVP / PVI copolymer I: Product name PVP / PVI copolymer-manufactured by International Specialty Products (weight average molecular weight 70,000, PVP / PVI = 30/70 molar ratio)
-PVP / PVI copolymer II: Product name PVP / PVI copolymer-manufactured by International Specialty Products (weight average molecular weight 70,000, PVP / PVI = 50/50 molar ratio)
・ PVP homopolymer: Polyvinylpyrrolidone PVP K-30 (powder weight average molecular weight 38,000) manufactured by International Specialty Products
Zeolite: “Zeo Builder” (Zeo Builder, median diameter: 3.0 μm)
Anionic surfactant: linear alkyl benzene sulfonate sodium having 12 to 14 carbon atoms in the alkyl group Non-ionic surfactant I (polyoxyalkylene alkyl ether): EO to primary alcohol having 10 to 14 carbon atoms 6-average added non-ionic surfactant II (polyoxyalkylene alkyl ether): 19-average added EO to primary alcohol having 10 to 14 carbon atoms PEG: polyethylene glycol (weight) (Average molecular weight 10,000)
・ Crystalline silicate: Pre-feed granule (manufactured by Tokuyama Siltech Co., Ltd.)
・ Oligomer D: Polyacrylic acid (weight average molecular weight 15,000; measured by GPC, converted to polyethylene glycol)
Enzyme: “Cellulase K” (described in JP-A 63-264699), “Cannase 24TK” (manufactured by Novo), “Sabinase 6.0T” (manufactured by Novo) in a mass ratio of 3: 1: 2. Use / Bleaching Particle I: Sodium borate / hydrogen peroxide adduct / Bleaching Particle II: Sodium carbonate / hydrogen peroxide adduct (sodium percarbonate); Bleaching agent according to paragraph 0019 of JP 2000-256699 A Particles / bleach activator particles I: N, N, N ′, N′-tetraacetylethylenediamine / bleach activator particles II: granulated sodium lauroyloxybenzenesulfonate (paragraph 0018 of JP-A-2000-256699) Described bleach activator particles)
Bleach activator particle III: Using sodium nonanoyloxybenzenesulfonate instead of sodium lauroyloxybenzenesulfonate, bleach activator particle III is obtained by the same preparation method as bleach activator particle II. It was.

  From Table 1, Examples 1-10 can provide the recontamination prevention performance of high dirt compared with Comparative Examples 1-2.

Claims (5)

(A) a copolymer having a structural unit derived from N-vinylpyrrolidone and a structural unit derived from N-vinylimidazole, the molar ratio in the copolymer [N-vinylpyrrolidone / N-vinylimidazole ] Is a copolymer having a weight average molecular weight of 10,000 to 100,000,
(B) a nonionic surfactant containing a polyoxyalkylene alkyl ether, and (c) a polyethylene glycol having a weight average molecular weight of 2,000 to 20,000,
A detergent composition.   The detergent composition according to claim 1, comprising (a) 0.01 to 10% by mass, (b) 10 to 30% by mass, and (c) 1 to 2% by mass of the component in the detergent composition.   The detergent composition according to claim 1 or 2, wherein the mass ratio [(a) / (b)] of the component (a) and the component (b) is 1/100 to 1/20. (D) Bleaching agent: 0.5 to 20% by mass, and (e) Bleach activator represented by the following general formula (1) and / or (2): 0.1 to 20% by mass The detergent composition according to any one of claims 1 to 3, wherein a mass ratio [(d) / (e)] of the component (d) and the component (e) is 3/4 to 20/1.

[Wherein, R ¹ represents an alkyl group having 4 to 13 carbon atoms, R ² represents an alkyl group having 5 to 13 carbon atoms, M represents a hydrogen atom or an alkali metal atom, an alkaline earth metal atom, ammonium or alkanolamine, When M is an alkaline earth metal atom, n is 2, and when M is a hydrogen atom, an alkali metal atom, ammonium or alkanolamine, n is 1. ]   A method for preventing recontamination of soil, wherein the textile product is bath-treated with an aqueous solution containing 10 to 2000 ppm of the detergent composition according to claim 1.