JP2602558B2 - Liquid bleach composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an acidic liquid bleach composition, and more particularly to an acidic liquid bleach composition having excellent storage stability and good bleaching power.

[Conventional technology]

Liquid-type bleaching agents for clothing using hydrogen peroxide include an alkaline liquid type and an acidic liquid type.

Decomposition of hydrogen peroxide is promoted in an alkaline region, and is slowed down in an acidic region. Therefore, the acidic type is relatively storage-stable at low temperatures, but is not sufficiently storage-stable at high temperatures.

Studies have been made to improve the storage stability of liquid bleaches containing hydrogen peroxide. For example,
No. 7774 discloses a storage-stable weakly acidic liquid bleach using sodium acid pyrophosphate, neutral sodium pyrophosphate and neutral potassium pyrophosphate in combination, and JP-A-49-52784 discloses alkylidene diphosphonic acid, ethylenediamine. A stable liquid bleach having a pH of 0.5 to 7 containing an organic acid selected from tetraacetic acid, diethylenetriaminepentaacetic acid and nitrilotrimethylenephosphonic acid, a soluble tin salt and an ammonium salt is disclosed in
JP-A-2-103386 discloses a hydrogen peroxide stabilizer comprising poly-α-hydroxyacrylic acid, and JP-A-54-10309 discloses a neutralization reaction of a magnesium compound and an acid by adding water to the compound. And the liquid material with hydrophilicity is adjusted to pH 4
~ 6 can suppress the decomposition of hydrogen peroxide.
No. 108500 discloses a stable liquid bleach having a pH of 1.8 to 5.5 containing an acid selected from an organic acid, phosphoric acid and boric acid and a nitrogen-containing compound, and JP-A-55-76161 discloses a condensed phosphoric acid. JP-A-57-154457 discloses that a synergistic stabilizing effect can be exhibited by blending poly-α-hydroxyacrylate in an alkaline hydrogen peroxide bleaching system using a salt as a stabilizer. Stabilizing aids for hydrogen peroxide bleach comprising a copolymer of acrylic acid ester and / or polyethylene glycol methacrylate are disclosed in Japanese Patent Application Laid-Open No. 62-185797, including poly-α-hydroxyacrylate and organic phosphonate. And hydrogen peroxide bleach stabilizers.

[Problems to be solved by the invention]

Hydrogen peroxide bleaching agents using these stabilizers have insufficient high-temperature storage stability, and when used in acidic systems, the stabilizing effect on hydrogen peroxide is too strong to obtain a sufficient bleaching effect. Problem arises.

[Means for solving the problem]

As a result of intensive studies, the present inventors have found that the addition of a surfactant and a maleic acid-based polymer having a specific molecular weight significantly improves the stability during high-temperature storage and has a good bleaching power. The present inventors have found that an agent can be obtained, and have completed the present invention.

That is, the present invention contains (a) 0.5 to 10% by weight of hydrogen peroxide, (b) 0.1 to 20% by weight of a surfactant, and (c) 0.05 to 5% by weight of a maleic acid-based polymer having an average molecular weight of 500 to 10,000. And a liquid bleaching composition having a pH of 1.5 to 6.

In the present invention, hydrogen peroxide (a) as a bleaching base is incorporated in the composition in an amount of 0.5 to 10% by weight, preferably 3 to 7% by weight.

Examples of the surfactant (b) used in the present invention include linear or branched alkylbenzene sulfonates, alkyl or alkenyl ether sulfates, alkyl or alkenyl sulfates, olefin sulfonates, alkane sulfonates, Or an anionic surfactant such as an unsaturated fatty acid salt; an alboxy or sulfobetaine type amphoteric surfactant; polyoxyalkylene alkyl or alkenyl ether, polyoxyethylene alkyl phenyl ether, higher fatty acid alkanolamide or an alkylene oxide adduct thereof, and sucrose Nonionic surfactants such as fatty acid esters, fatty acid glycerin monoesters, alkylamine oxides, pluronic surfactants, and sorbitan fatty acid esters or ethylene oxide adducts thereof are exemplified. Among them, particularly, an anionic surfactant and a nonionic surfactant, the weight ratio of anionic surfactant / nonionic surfactant is 1/5 to 5/1, preferably
It is desirable to use it so as to be 1/3 to 3/1. in this case,
Particularly preferred anionic surfactants linear alkyl (C ₈ ~C ₁₈₎ benzenesulfonate, alkyl (C ₈ -C
₁₈ ) Ether (1 to 10 moles of ethylene oxide added)
Sulfates, α-olefin (C ₁₂ -C ₁₈ ) sulfonates, alkyl (C ₈ -C ₁₈ ) sulfates, etc., and particularly preferred nonionic surfactants include polyoxyethylene (addition mole 1 to 1). 30) Alkyl ethers and the like.

The surfactant (b) is incorporated in the composition in a total amount of 0.1 to 20% by weight, preferably 3 to 15% by weight.

The maleic acid-based polymer (c) used in the present invention includes a maleic acid homopolymer or a copolymer of maleic acid and another vinyl monomer (including these partially and completely neutralized salts). Examples of the copolymer include a copolymer of maleic acid with a vinyl monomer selected from acrylic acid, methacrylic acid, acrylic ester, methacrylic ester, vinyl acetate and the like. Above all,
Copolymers of acrylic acid or methacrylic acid and maleic acid are preferred. The monomer ratio between maleic acid and other monomers is preferably in the range of maleic acid / monomer = 90/10 to 40/60. As the polymer (c), those having an average molecular weight in the range of 500 to 10,000, preferably 500 to 5,000, and more preferably 600 to 3,000 are used. When the average molecular weight of the polymer is less than 500 or more than 10,000, the storage stabilizing effect rapidly decreases. The polymer (c) is blended in the composition at 0.05 to 5% by weight, preferably 0.5 to 3% by weight. If the amount of the polymer (c) is less than 0.05% by weight, a sufficient effect cannot be obtained. If the amount exceeds 5% by weight, a problem of polymer separation may occur.

The composition of the present invention is usually balanced by adding water to the above-mentioned components (a) to (c). In addition, alcohols such as ethanol, isopropanol and ethylene glycol, thickeners, fragrances, dyes, fluorescent dyes, Oxygen and the like may be added as necessary.

The pH of the stock solution of the composition of the present invention is an inorganic acid such as hydrochloric acid or sulfuric acid,
Using organic acids such as p-toluenesulfonic acid and citric acid
It is adjusted to 1.5 to 6, preferably 2.0 to 4.5. Composition p
When H exceeds 6, the storage stability is significantly reduced.

[Examples] The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 A bleaching composition having the composition shown in Table 1 was prepared and subjected to the following tests.

(1) Storage stability (bottle appearance) Evaluation method The bleaching compositions shown in Table 1 were polyethylene cylinder bottles shown in FIG.
l, bottom wall thickness 0.6 mm), sealed 600 ml, stored at 50 ° C for 14 days, taken out, and visually observed the swelling of the cylinder bottle. FIG. 1 (A) shows a bottle in a normal state, and the bottom 2 is in an indented state. FIG. 1 (B) shows an inflated cylinder bottle 1.
This shows an example in which the bottom 2 bulges outward.
Here, the evaluation criteria for the swelling of the bottle are as follows. Each test was performed with 10 bottles, and indicated by the number of ○, Δ, and ×.

Evaluation criteria ：: No change [Fig. 1 (A)] ：: The bottom of the bottle swells slightly and the sitting of the bottle deteriorates.

×: The bottle bottom swells and the bottle falls down (0.6k
(This state is obtained at an internal pressure of g / cm ² or more) (Fig. 1 (B)) (2) Evaluation method of bleaching rate Bleaching agent in tap water at 20 ° C so that the effective oxygen concentration becomes 0.05%. After dissolving the bleaching agent of the composition shown in Table 3 and immersing 5 pieces of black tea-stained cloth prepared as described below at 20 ° C for 30 minutes in 300 ml of the prepared bleaching solution, rinse with tap water, dry, The bleaching rate was calculated by the formula.

The reflectance is measured by Nippon Denshoku colorimeter N-DR101-D.
It was measured using P.

Black tea contaminated cloth 80g of Nitto black tea (yellow package) is boiled for about 15 minutes in 3 ion-exchanged water, then rubbed with desalted cotton.
Dip a cotton cloth # 2003 in this solution and boil for about 15 minutes.
It was lowered from the heat as it was, left standing for about 2 hours, allowed to dry naturally, washed with water until the washing solution did not color, dehydrated, pressed, and then used as a test piece of 8 × 8 cm, which was subjected to an experiment.

 Table 1 shows the results.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a cylinder bottle in a normal state, and FIG. 1B is a cross-sectional view of an expanded cylinder bottle. 1 bottle 2 bottom

Claims (3)

(57) [Claims] (1) 0.5 to 10% by weight of hydrogen peroxide (b) 0.1 to 20% by weight of a surfactant (c) 0.05 to 5% by weight of a maleic acid polymer having an average molecular weight of 500 to 10,000 A liquid bleach composition wherein the pH of the composition is 1.5-6. 2. An anionic surfactant and a nonionic surfactant are used as the surfactant (b) in a weight ratio of anionic surfactant / nonionic surfactant.
The liquid bleach composition according to claim 1, which is used in the range of 1/5 to 5/1. 3. The liquid bleach composition according to claim 1, wherein the maleic acid polymer (c) is a copolymer of acrylic acid or methacrylic acid and maleic acid.