JP2602557B2 - 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,
JP-A-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. JP-A-5-103386 discloses 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. A hydrogen peroxide stabilizer comprising poly-α-hydroxyacrylic acid is disclosed in JP-A-54-10309, in which water is added to a magnesium compound and an acid to neutralize the complex, and the complex is formed. Liquid with 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 JP-A-62-185797. And hydrogen peroxide bleach stabilizers.

[Problems to be solved by the invention]

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

[Means for solving the problem]

The present inventors have conducted intensive studies and found that the addition of polyacrylic acid or a salt thereof having a specific molecular weight in a specific surfactant system significantly improves the stability during high-temperature storage and has a good bleaching power. The inventors have found that a hydrogen bleach can be obtained, and have completed the present invention.

That is, the present invention provides: (a) 0.5 to 10% by weight of hydrogen peroxide (b) anionic surfactant (c) nonionic surfactant The components (b) and (c) are used as (b) / (c) weight. (B) + (c) 0.1 to 20% by weight in total, (d) 0.1 to 5% by weight of polyacrylic acid or a salt thereof having an average molecular weight of 1,000 to 100,000, It is intended to provide a liquid bleach composition wherein the pH of the composition is from 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 anionic 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, saturated or unsaturated fatty acid salts and the like, and the nonionic surfactant (c) includes polyoxyalkylene alkyl or alkenyl ether,
Polyoxyethylene alkylphenyl ether, higher fatty acid alkanolamide or an alkylene oxide adduct thereof, sucrose fatty acid ester, fatty acid glycerin monoester, alkylamine oxide, pluronic surfactant, sorbitan fatty acid ester or an ethylene oxide adduct thereof, and the like. .

The anionic surfactant (b) and the nonionic surfactant (c) are contained in the composition in a total amount of (b) + (c) of 0.1 to 2%.
0% by weight, preferably 3 to 15% by weight. The weight ratio of the component (b) to the component (c) is 1 / (b) / (c).
It is 5 to 5/1, preferably 1/3 to 3/1. Particularly preferred anionic surfactants (b) are linear alkyl (C ₈ -C ₁₈ ) benzenesulfonate, alkyl (C ₈ -C ₁₈ ) ether (ethylene oxide addition mole number 1-10) sulfate, α-
Olefins (C ₁₂ ~C ₁₈₎ sulfonates, alkyl (C ₈ ~
C ₁₈ ) sulfate, etc., and particularly preferred nonionic surfactant (c) is polyoxyethylene (addition mole number 1 to 1).
30) It is an alkyl ether.

Polyacrylic acid or a salt thereof (d) used in the present invention
Has an average molecular weight of 1,000 to 100,000, preferably 2,000 to 20,000
Of the range. Average molecular weight less than 1000 or 10
If it exceeds 10,000, the storage stabilizing effect rapidly decreases. Carbopol, which is often used as a thickener in a hydrogen peroxide-based acidic liquid bleach, is a polyacrylic acid having a very large molecular weight and is partially crosslinked, and is not crosslinked as used in the present invention. It is different from polyacrylic acid. The component (d) is incorporated in the composition in an amount of 0.1 to 5% by weight, preferably 0.5 to 3% by weight. (D) The compounding amount of the component is 0.1
If the amount is less than 5% by weight, a sufficient effect cannot be obtained.

The composition of the present invention is usually balanced by adding water to the above components (a) to (d). 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.

〔Example〕

Hereinafter, the present invention will be described 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: 0.6mm), sealed 600ml, stored at 50 ° C for 14 days, taken out and observed the swelling of the cylinder bottle with the naked eye. Fig. 1 (A) shows the bottle in a normal state. , And the bottom portion 2 is in a concave state inward. FIG. 2 (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 (1)

(57) [Claims] (1) Hydrogen peroxide 0.5 to 10% by weight (b) Anionic surfactant (c) Nonionic surfactant The above components (b) and (c) are (b) / (c) weight (B) + (c) 0.10-20% by weight in total (d) 0.1-5% by weight of polyacrylic acid or a salt thereof having an average molecular weight of 1,000-100,000 A liquid bleach composition wherein the pH of the composition is 1.5-6.