JP2007039600A - Liquid bleaching agent composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid bleaching agent composition which remarkably improves the bleaching effect by a bleaching activator in the system containing 0.1-3 mass% hydrogen peroxide and inhibits the odor of fatty acids produced on decomposition of the bleaching activator. <P>SOLUTION: The liquid bleaching agent composition comprises (a) a compound which produces hydrogen peroxide or hydrogen peroxide in water, (b) an alkanoyloxybenzenesulfonic acid, an alkanoyloxybenzenecarboxylic acid or a salt thereof, (c) a polyoxyethylene alkyl ether type nonionic surface active agent or a polyoxyalkylene alkyl ether type nonionic surface active agent having an oxyethylene group and an oxypropylene group which has an HLB calculated by the Griffin method of 13-17, and (d) a compound having an alkali metal or alkaline earth metal ion at a specific ratio with a molar concentration of the alkali metal and/or alkaline earth metal ion including the component (d) in the composition is 200-1,200 mM. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid bleach composition.

  Liquid bleaching compositions containing bleaching components such as hydrogen peroxide and bleach activators have acidic pH during storage of the bleaching composition from the viewpoint of achieving both the stability of the bleaching composition and the bleaching effect ( For example, the pH needs to be 2 to 3). On the other hand, in the bleaching field, a technique for increasing pH by diluting in water at the time of use (pH jump technique) is known, but in order to obtain a satisfactory bleaching effect and washing effect when diluted in water, It is necessary to raise the pH of the bleach composition after dilution with water to 9 or more, for example. As a means for achieving this, it is necessary to previously adjust the pH of the bleach composition before dilution with water (at the time of storage) to 5 or more. However, when the pH during storage is adjusted to 5 or more in this way, there is a problem in the stability of the bleaching component in the bleaching agent composition. Although the stability of hydrogen peroxide is enhanced by a general radical scavenger, it is difficult to stabilize the bleach activator, and there is a need for an improvement method.

  Patent Document 1 discloses a soil removal composition containing an amide or imide organic peroxyacid / surfactant / pH adjusting system (borate / polyol) having low solubility in water. This Patent Document 1 discloses a stabilization technique in water by a solid dispersion system using a water-insoluble organic peracid, not a system containing hydrogen peroxide, but merely using this technique. The stability of the bleach activator (peracid precursor) is not improved.

  Patent Document 2 discloses a soil removal composition containing a solid, water-insoluble organic peroxyacid / surfactant / pH jump system (borate / polyol) / agar or saccharide. However, the stabilization of the bleach activator in hydrogen peroxide cannot be realized only by using this technique.

  Patent Document 3 discloses a liquid bleach composition in which hydrogen peroxide is stabilized in a high pH range (pH 4 to 7) with a phenol derivative. However, this technique improves the stability of hydrogen peroxide but does not achieve stabilization of the bleach activator.

It is also known that bleach activators such as alkanoyloxybenzene sulfonic acid, alkanoyloxybenzene carboxylic acid, and salts thereof decompose in the product to produce fatty acids and emit fatty acid odors. The stability of the bleach activator in the product is improved by reducing the hydrogen peroxide concentration, but the bleaching power is significantly reduced. At this time, in order to compensate for the decrease in bleaching power, simply increasing the concentration of the bleach activator in the bleach composition does not provide a sufficient bleaching effect, but also decomposes a large amount of the bleach activator. Produces a pronounced fatty acid odor.
Japanese Patent Laid-Open No. 6-100908 JP-A-7-70593 Japanese Patent Laid-Open No. 11-181492

  An object of the present invention is a liquid that drastically improves the bleaching effect of a bleach activator in a system containing 0.1 to 3% by mass of hydrogen peroxide, and suppresses the fatty acid odor generated when the bleach activator is decomposed. It is to provide a bleach composition.

  As a result of intensive studies, the present inventors have included a specific amount of a specific nonionic surfactant, an alkali metal and / or an alkaline earth metal in a system containing 0.1 to 3% by mass of hydrogen peroxide, It has been found that by setting the electrical conductivity within a specific range, the bleaching power can be drastically improved, and further, the fatty acid odor generated when the bleach activator is decomposed can be suppressed.

That is, this invention contains the following (a) component, (b) component, (c) component, and (d) component, and the content of (a) component in a composition is 0.1-3 mass%, The content of the component (b) is 1 to 10% by mass, the content of the component (c) is 15 to 50% by mass, and the alkali metal and / or alkaline earth metal containing the component (d) in the composition Provided is a liquid bleach composition having a molar concentration of 200-1200 mM.
(A) Hydrogen peroxide or a compound that generates hydrogen peroxide in water (b) At least one bleach activator selected from alkanoyloxybenzenesulfonic acid, alkanoyloxybenzenecarboxylic acid and salts thereof (c) Griffin method A nonionic surfactant having an HLB of 13 to 17 determined in Step 1, and a polyoxyethylene alkyl ether type nonionic surfactant, and a polyoxyalkylene alkyl ether type nonionic surfactant having an oxyethylene group and an oxypropylene group At least one nonionic surfactant selected from agents (d) a compound other than component (b) having at least one metal ion selected from alkali metals and alkaline earth metals. The present invention further includes (e) At least one compound selected from boron compounds as components, and ( f) a compound containing at least one site having one hydroxyl group on each of adjacent carbon atoms as a component; and a molar ratio of (f) component / (e) component is 1.5 to 2.7. A liquid bleach composition as described above is provided.

  The liquid bleaching agent composition of the present invention has a drastically improved bleaching power in a region containing 0.1 to 3% by mass of hydrogen peroxide, and can maintain a good odor even after storage.

[(A) component]
The liquid bleach composition of the present invention contains hydrogen peroxide or a compound that generates hydrogen peroxide in water as the component (a). Examples of the compound that generates hydrogen peroxide in water include percarbonate and perborate.

[Component (b)]
The liquid bleach composition of the present invention contains at least one bleach activator selected from alkanoyloxybenzenesulfonic acid, alkanoyloxybenzenecarboxylic acid and salts thereof as component (b). In the component (b) of the present invention, the alkanoyloxy group preferably has a linear or branched chain having 8 to 14 carbon atoms from the viewpoint of exhibiting an excellent bleaching effect, and the alkanoyloxy group further has a carbon number. More preferably, it has 8 to 14 branched chains and has a side chain at the α-position or β-position of the carbon atom forming the ester bond.

  Examples of the alkanoyloxy group having a side chain at the α-position or β-position of the carbon atom forming the ester bond include 2-ethylhexanoyl group, 2-propylheptanoyl group, 3,5,5-trimethylhexanoyl group, and the like. Benzenesulfonic acid or carboxylic acid having a branched alkanoyloxy group or a salt thereof is particularly preferable. As the salt, sodium salt, potassium salt, and magnesium salt are preferable, and sodium salt is particularly preferable from the viewpoint of solubility.

  Specific examples of the component (b) include compounds represented by the following formulas (1-1) to (1-4), and compounds represented by the formulas (1-1) to (1-2) preferable.

[Component (c)]
The liquid bleach composition of the present invention is a nonionic surfactant having a HLB of 13 to 17, preferably 13 to 16 as the component (c), and polyoxyethylene alkyl ether type nonionic A surfactant and at least one nonionic surfactant selected from polyoxyalkylene alkyl ether type nonionic surfactants having an oxyethylene group and an oxypropylene group are contained.
Here, HLB calculated | required with the Griffin method is HLB calculated | required with the following formula | equation.

HLB value = 20 × total formula weight of hydrophilic part / molecular weight (c) The component is preferably a compound represented by the following general formula (2).

R ^2a —O (EO) _m (PO) _n —H (2)
[Wherein R ^2a represents a hydrocarbon group having 8 to 10 carbon atoms, preferably 10 to 18 carbon atoms, more preferably 12 to 14 carbon atoms, still more preferably an alkyl group or an alkenyl group. EO is an oxyethylene group, PO is an oxypropylene group, m is a number from 1 to 20 indicating the average number of added moles of EO, n is a number from 0 to 20 indicating the average number of added moles of PO, and m and n Indicates the number selected so that the HLB determined by the Griffin method in the relationship with R ^2a is 13-17. Preferably, m is a number of 6 to 15, more preferably 7 to 12, and n is preferably a number of 0 to 10, more preferably 1 to 5, particularly preferably 1 to 3. ]
In general formula (2), when n is not 0, EO and PO may be arranged in either random addition form or block addition form, but are represented by the following general formula (3). Compounds are particularly preferred.

R ^3a —O (C ₂ H ₄ O) _p (C ₃ H ₆ O) _q (C ₂ H ₄ O) _r —H (3)
[Wherein, R ^3a is a hydrocarbon group having 8 to 18 carbon atoms, preferably 10 to 14 carbon atoms, more preferably an alkyl group or an alkenyl group, and still more preferably an alkyl group. p, q and r are each independently a number of 1 to 10, preferably 2 to 8. Further, p, q and r are such that the HLB determined by the Griffin method in relation to R ^3a is 13 to 17. Selected. ]
Examples of the nonionic surfactant represented by the general formula (2) or the general formula (3) include the following compounds.

_{C 12 H 25 -O (C 2} H 4 O) m1 -H (m 1 = 7~20, HLB = 13.3~16.9)
_{C 14 H 29 -O (C 2} H 4 O) m2 -H (m 2 = 7~24, HLB = 13.1~17.0)
C ₁₂ H ₂₅ —O (C ₂ H ₄ O) _p1 (C ₃ H ₆ O) ₂ (C ₂ H ₄ O) _r1 —H
(P ₁ + r ₁ = 5 to 18, HLB = 13.4 to 17.0)
In the present invention, as the component (c), in the general formula (2), m is 8 to 12, and n is 0 to 3 polyoxyalkylene alkyl ether type nonionic surfactant component (HLB 13.1 to 17). It is most preferable from the viewpoint of cleaning effect.

[Component (d)]
The liquid bleach composition of the present invention contains a compound other than the component (b) having at least one metal ion selected from alkali metals and alkaline earth metals as the component (d).

  The component (d) used in the present invention is preferably a compound having an alkali metal ion from the viewpoint of increasing the ionic strength of the composition and obtaining a good liquid feeling, and is lithium, sodium, potassium, rubidium, cesium or francium. And halides, sulfates, carbonates, hydroxides, acetates, phosphates, organic acid salts and the like. Among these, sulfates such as sodium sulfate and potassium sulfate, carbonates such as sodium carbonate and potassium carbonate, hydroxides such as sodium hydroxide and potassium hydroxide, and phosphates such as sodium phosphate and potassium phosphate are preferable. .

  In the present specification, when simply referring to alkali metal and / or alkaline earth metal, it means all alkali metals and alkaline earth metals contained in the composition. That is, the alkali metal and / or alkaline earth metal can also contain, for example, the alkali metal and / or alkaline earth metal derived from the component (b), the pH adjuster, etc. in addition to the component (d).

[Liquid bleach composition]
The liquid bleach composition of this invention contains (a) component, (b) component, (c) component, and (d) component as an essential component. The content of the component (a) in the composition of the present invention is 0.1 to 3% by mass and 0.5 to 2.5% by mass from the viewpoint of obtaining high bleach activator stability and high bleaching performance. % Is preferable, and 1-2 mass% is more preferable. The content of the component (b) is 1 to 10% by mass, preferably 1.2 to 6% by mass, from the viewpoint of developing an excellent bleaching effect and maintaining the odor of the product well, and preferably 1.5 to 6% by mass. -5 mass% is more preferable. The content of the component (c) is 15 to 50% by mass, preferably 20 to 50% by mass, and more preferably 25 to 50% by mass from the viewpoint of keeping electric conductivity in a certain range and obtaining high bleaching power. .

  The molar concentration of the alkali metal and / or alkaline earth metal containing the component (d) in the composition of the present invention is 200 to 1200 mM from the viewpoint of increasing the ionic strength of the composition and obtaining a good liquid feeling, 300-800 mM is preferable and 300-650 mM is more preferable.

In the present invention, the molar concentration of alkali metal and / or alkaline earth metal in the liquid bleach composition was measured by AA-855, an atomic absorption / flame light combined spectrophotometer AA-855 manufactured by Japan Jarrell Ash.
In addition, the electrical conductivity of the composition at 25 ° C. is preferably 0.6 S / m or less, more preferably 0.5 S / m or less, and more preferably 0.3 S from the viewpoint of suppressing fatty acid odor during decomposition of the bleach activator. / M or less is more preferable. Thus, the storage stability of the composition in pH 4-7 can be improved by setting electrical conductivity below a predetermined value. In addition, in order to adjust electrical conductivity, inorganic ions can be removed by electrodialysis or the like.

  In order to adjust such electric conductivity within a predetermined range, the molar concentration of the alkali metal and / or alkaline earth metal containing the component (d) is adjusted to be in the above range. For adjusting the molar concentration of the alkali metal and / or alkaline earth metal containing the component (d), an electrodialysis method can be applied as in the case of adjusting the electric conductivity.

  The electrical conductivity at 25 ° C. of the composition of the present invention is measured by CONDUCTIVITY METER CM-60S manufactured by Toa Denpa Kogyo Co., Ltd.

  In the present invention, the component (b), the content of the component (c), and the molar concentration of the alkali metal and / or alkaline earth metal containing the component (d) are within a specific range, so that the component (a) An excellent bleaching effect is obtained in a relatively low concentration region.

  Such an effect is considered to be obtained because the component (b) and the component (d) are present in the micelle of the component (c) under the above conditions. Since the component (d) is present in the micelle, the mobility is lowered and the electrical conductivity in the liquid bleaching composition is lowered to a specific range, while the component (d) is present in the micelle at a high concentration. Hydrogen peroxide ions released to the outside can be attracted to the micelle side. As a result, the hydrogen peroxide ions can interact closely with the component (b) in the micelle, so that organic peracids can be efficiently generated, and it is estimated that the bleaching power of the liquid bleaching composition has been significantly improved. Is done.

  Furthermore, the liquid bleach composition of this invention can suppress a fatty-acid odor by the said conditions. The cause of this fatty acid odor is considered to be a fatty acid generated when the component (b) is decomposed. In the liquid bleach composition of the present invention, since the component (b) and the component (d) are present in the micelle of the component (c) at a high concentration, the generated fatty acid is efficiently converted into a salt with the component (d). It is speculated that the fatty acid odor could be suppressed.

  The liquid bleach composition of the present invention is used as a component (e) in order to impart a pH jump effect, that is, to keep the pH of the composition low during storage and to increase the pH when diluted in use. It is preferable to contain a boron compound. The content of the component (e) in the composition is preferably 0.05 to 2% by mass, more preferably 0.05 to 1% by mass, and still more preferably 0.15 to 0.5% by mass as a boron atom. 0.2 to 0.4 mass% is particularly preferable.

  Examples of the boron compound include boric acid, sodium borate, potassium borate, ammonium borate, sodium tetraborate, potassium potassium borate, and ammonium ammonium borate. Among the boron compounds, it is preferable that the di-form is a main component in order to make the pH of the diluted solution 9 or more and less than 10.5, and 70 to 100 mol% of the boron compound is contained in the composition of the present invention. The di-form is preferable. The content of the mono form is preferably less than 5 mol% of the boron compound, and it is preferable that the contents of boric acid, borax and borate present alone are less than 25 mol% of the boron compound. .

  In order to maintain the pH control effect under high dilution conditions, the liquid bleach composition of the present invention has one or more sites each having one hydroxyl group on both adjacent carbon atoms as component (f). It is preferable to contain a compound. The content of the component (f) in the composition is preferably 3 to 35% by mass, more preferably 5 to 30% by mass, and particularly preferably 7 to 20% by mass.

  Specific examples of the component (f) include the following compounds (1) to (4).

(1) Glycerin, diglycerin, triglycerin, alkyl glyceryl ether having 1 to 10 carbon atoms of alkyl group, alkyl diglyceryl ether, alkyl triglyceryl ether; glycerol or glycol selected from ethylene glycol and 1,2-propylene glycol (2) Sugar alcohols selected from sorbitol, mannitol, maltose, inositol, phytic acid (3) Reduction selected from glucose, apiose, arabinose, galactose, lyxose, mannose, galose, aldose, idose, talose, xylose, fructose Sugars (4) A polysaccharide selected from starch, dextran, xanthan gum, guar gum, curdlan, pullulan, amylose and cellulose.

  In the present invention, the sugar alcohols of the above (2) are particularly preferable, and sorbitol is particularly preferable from the viewpoint of stability and bleaching / washing effect.

  In addition, when component (f) is present in excess, the stability of hydrogen peroxide may be impaired. Therefore, from the viewpoint of satisfying both the excellent pH jump effect and the stability of hydrogen peroxide, component (f) and ( The ratio of the component e) is the molar ratio of the component (f) / the component (e) (however, in the case of borax and sodium tetraborate, it contains 4 boron atoms and is considered to be 4 equivalents), preferably 1 0.5 to 2.7, more preferably 2.0 to 2.7, and particularly preferably 2.2 to 2.7.

  The composition of the present invention preferably contains a sequestering agent (hereinafter referred to as component (g)) from the viewpoint of further improving the bleaching effect. The content of the component (g) in the composition is preferably 0.05 to 0.3% by mass, more preferably 0.1 to 0.25% by mass, and particularly preferably 0.15 to 0.2% by mass.

  As the component (g) used in the present invention, a compound having a phosphonic acid group or a phosphonic acid group is preferable. Specific compounds having a phosphonic acid group or phosphonic acid group include ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonic acid, ethane-1-hydroxy-1,1-diphosphonic acid, and ethane. Phosphonic acid selected from hydroxy-1,1,2-triphosphonic acid, ethane-1,2-dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid, or an alkali metal salt or alkanolamine salt thereof, 2-phosphonobutane And phosphonocarboxylic acids selected from -1,2-dicarboxylic acid, 1-phosphonobutane-2,3,4-tricarboxylic acid, α-methylphosphonosuccinic acid, and alkali metal salts or alkanolamine salts thereof. Phosphonic acid or an alkali metal salt thereof, preferably ethane-1-hydride Carboxy-1,1-diphosphonic acid or alkali metal salts thereof are most preferred.

  The liquid bleach composition of the present invention may contain at least one selected from an anionic surfactant, a cationic surfactant and an amphoteric surfactant from the viewpoint of obtaining excellent detergency.

  Examples of the anionic surfactant include alkylbenzene sulfonate having 10 to 18 carbon atoms or alkenyl group, polyoxyalkylene alkyl ether sulfate, alkyl sulfate, α-olefin sulfonate, α-sulfone. Examples include fatty acid salts and α-sulfo fatty acid lower alkyl ester salts.

Any alkylbenzene sulfonate can be used as long as it has an alkyl group having an average carbon number of 8 to 16 among those commonly distributed in the detergent surfactant market. For example, Kao Corporation Neoperex F25 made by Shell, Dobs102 made by Shell, etc. can be used. Industrially, alkylbenzene widely distributed as a detergent raw material can be obtained by sulfonation using an oxidizing agent such as chlorosulfonic acid or sulfurous acid gas. As for the average carbon number of an alkyl group, 10-14 are preferable. In addition, as polyoxyalkylene alkyl ether sulfate, an average of 0.5 to 5 moles of ethylene oxide per molecule is added to a linear or branched primary alcohol or linear secondary alcohol having an average carbon number of 10 to 18, This can be obtained by sulfation using, for example, the method described in JP-A-9-137188. The average carbon number of the alkyl group is preferably 10-16. The alkyl sulfate salt is obtained by sulfonating a linear or branched primary alcohol or linear secondary alcohol having 10 to 16 carbon atoms, preferably 10 to 14 with SO ₃ or chlorosulfonic acid, and neutralizing. it can. As α-olefin sulfonate, 1-alkene having 8 to 18 carbon atoms can be obtained by sulfonation with SO ₃ , hydration and neutralization, and a compound having a hydroxyl group in a hydrocarbon group. A mixture of compounds in which a saturated bond is present. In addition, the α-sulfo fatty acid lower alkyl ester salt preferably has 10 to 16 carbon atoms in the fatty acid residue, and methyl ester or ethyl ester is preferable from the viewpoint of cleaning effect. As the salt, sodium salt, potassium salt, magnesium salt, calcium salt, alkanolamine salt, and ammonium salt are preferable, and sodium salt, potassium salt, and magnesium salt are preferable from the viewpoint of cleaning effect.

  In the present invention, a polyoxyethylene alkylsulfuric acid ester salt having 10 to 14 carbon atoms, an ethylene oxide average addition mole number of 1 to 3 and an alkylbenzene sulfonic acid salt having 11 to 15 carbon atoms are particularly preferable from the viewpoint of cleaning effect.

  As the cationic surfactant, one or two hydrocarbon groups having 10 to 18 carbon atoms which may be separated by an ester group or an amide group, and the remaining are alkyl groups or hydroxyalkyl groups having 1 to 3 carbon atoms. A quaternary ammonium salt, preferably an alkyl sulfate salt having 1 to 3 carbon atoms, is suitable.

  The amphoteric surfactant preferably contains at least one selected from the compounds represented by the following general formula (4) or general formula (5) from the viewpoint of cleaning effect.

[Wherein, R ^4a is a linear alkyl group or alkenyl group having 8 to 16 carbon atoms, preferably 10 to 16 carbon atoms, particularly preferably 10 to 14 carbon atoms, and R ^4c and R ^4d each independently represents 1 to 1 carbon atoms. 3 is an alkyl group or a hydroxyalkyl group, preferably a methyl group, an ethyl group or a hydroxyethyl group. R ^4b is an alkylene group having 1 to 5 carbon atoms, preferably 2 or 3 carbon atoms. A is a group selected from —COO—, —CONH—, —OCO—, —NHCO—, and —O—, and s is a number of 0 or 1. ]

[Wherein R ^5a is an alkyl group or alkenyl group having 9 to 23 carbon atoms, preferably 9 to 17 carbon atoms, particularly preferably 9 to 15 carbon atoms, and R ^5b is an alkylene group having 1 to 6 carbon atoms, preferably 2 or 3 carbon atoms. It is a group. B is a group selected from —COO—, —CONH—, —OCO—, —NHCO—, and —O—, and t is a number of 0 or 1. R ^5c and R ^5d are each independently an alkyl group having 1 to 3 carbon atoms or a hydroxyalkyl group, and R ^5e is an alkylene having 1 to 5 carbon atoms, preferably 1 to 3 carbon atoms optionally substituted with a hydroxyl group. It is a group. D is a group selected from —COO ⁻ , —SO ₃ ⁻ , and —OSO ₃ ^— . ]
The composition of the present invention can achieve stabilization of the bleach activator at a pH of 4 to 7, preferably 4.6 to 7, more preferably 5 to 7 at 20 ° C., and is excellent in bleach washing even after storage. It has performance and is useful as a liquid bleach composition. The pH is measured after cooling (20 ° C.) using a pH meter F52 manufactured by Horiba, Ltd. and a pH electrode 6367-S004.

  As the pH adjuster, inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid can be used as acid agents, and sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and the like can be used as alkaline agents.

Examples 1-9 and Comparative Examples 1-7
A liquid bleach composition having the composition shown in Table 1 was prepared using the following components. About this liquid bleach composition, the bleaching performance, the storage stability of the bleach activator and the odor after storage were evaluated by the following methods. The results are shown in Table 1.

<Compounding ingredients>
a-1; hydrogen peroxide b-1; bleach activator b-2 represented by the above formula (1-1); bleach activator c-1 represented by the above formula (1-3); Oxyethylene lauryl ether (oxyethylene average added moles 8, HL
B13.1)
_{c-2; C 12 H 25} O- (C 2 H 4 O) 7 - (C 3 H 6 O) 2 - (C 2 H 4 O) 4 -H (HLB15.8)
d-1; sodium citrate d-2; sodium hydroxide d-3; potassium chloride e-1; boric acid f-1; D-sorbitol g-1; sequestering agent; ethane-1-hydroxy-1, 1-diphosphonic acid (DayQuest 2010, manufactured by Solusia)
<Evaluation method of bleaching performance>
After mixing 1 mL of the liquid bleach composition and 1000 mL of 4 ° DH, meat sauce-contaminated cloth (4 sheets) prepared by the following method was added thereto, and bleaching was performed for 10 minutes at 20 ° C. and 80 rpm using a tartometer. The reflectance of the cloth surface before and after the treatment was measured, and the bleaching rate was determined by the following formula.

・ Preparation of Meat Sauce Contaminated Cloth Solid content of Meat Sauce (Ripe Tomato Meat Sauce (May 27, 2007 Expiration Date, Lot No .: D5527JF) / Canned 259 g of Canned Content) manufactured by Kagome Co., Ltd. mesh (open eyes; 500 μm) ), And the resulting liquid was heated until boiling. Cotton gold cloth # 2003 was immersed in this solution and boiled for 15 minutes. After removing from the fire as it was for about 2 hours and leaving it to 30 ° C., the cloth was taken out and the excess liquid was removed with a spatula and allowed to dry naturally. Thereafter, it was pressed and subjected to an experiment as a 10 × 10 cm test cloth.

<Method for evaluating storage stability of bleach activator>
80 g of the liquid bleach composition was placed in a 100 mL glass sample bottle and stored at 50 ° C. for 2 weeks. The content of the bleach activator in the liquid bleach composition before and after storage was measured by high performance liquid chromatography, and the residual ratio of the bleach activator was determined by the following formula.

<Evaluation method of odor after storage>
80 g of the liquid bleach composition was placed in a 100 mL glass sample bottle and stored at 50 ° C. for 2 weeks, and the odor strength of the sample was subjected to sensory evaluation.
Here, “odor intensity” is described in the book of Asakura Shoten, edited by Sadataka Takagi and Tatsuaki Shibuya, “Smell Science” (1989), page 5. To 5 in 6 stages. The sensory evaluation of this example was performed by three persons skilled in this sensory evaluation.
0: Odorless 1: I don't know what smell it is, but I feel it finally 2: Weak smell that can tell what it smells 3: Easy smell 4: Strong smell 5: Strong smell I can't stand

Claims (4)

The following (a) component, (b) component, (c) component and (d) component are contained, and the content of (a) component in the composition is 0.1 to 3% by mass, and the content of (b) component The amount is 1 to 10% by mass, the content of the component (c) is 15 to 50% by mass, and the molar concentration of the alkali metal and / or alkaline earth metal containing the component (d) in the composition is 200 to 1200 mM. A liquid bleach composition.
(A) Hydrogen peroxide or a compound that generates hydrogen peroxide in water (b) At least one bleach activator selected from alkanoyloxybenzenesulfonic acid, alkanoyloxybenzenecarboxylic acid and salts thereof (c) Griffin method A nonionic surfactant having an HLB of 13 to 17 determined in Step 1, and a polyoxyethylene alkyl ether type nonionic surfactant, and a polyoxyalkylene alkyl ether type nonionic surfactant having an oxyethylene group and an oxypropylene group At least one nonionic surfactant selected from agents (d) a compound other than component (b) having at least one metal ion selected from alkali metals and alkaline earth metals   The liquid bleach composition according to claim 1, wherein the electrical conductivity at 25 ° C is 0.6 S / m or less.   The liquid bleach composition according to claim 1 or 2, wherein the pH at 20 ° C is 4 to 7. And (e) at least one compound selected from boron compounds as a component, and (f) a compound having at least one site having one hydroxyl group on each of adjacent carbon atoms as a component; The liquid bleach composition in any one of Claims 1-3 whose molar ratio of (f) component / (e) component is 1.5-2.7.