JPS6323996A - Bleaching composition - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a bleach composition, more specifically, a bleach composition containing magnesium monoperphthalate which has significantly improved storage stability in terms of available oxygen and powder flowability. Bleach composition.

[Conventional technology and its problems]

Magnesium monoperphthalate has strong oxidizing power and is expected to be used as a raw material for bleaching agents, but its storage stability, such as available oxygen and powder properties, is insufficient, and although it has excellent performance, However, it has not yet reached the point of widespread use in the market.

For example, JP-A-56-73059 discloses a bleach composition containing a magnesium monoperphthalate salt and a desensitizing diluent, but the composition was evaluated for storage stability at high temperatures. However, we found that the performance was not stable (unstable, the decomposition of effective oxygen was severe, and even though some performance remained, the powder flowability was significantly impaired and the phenomenon of caking was observed, making it impossible to supply it to the market as a product). I found out that there isn't.

[Means for solving problems]

Therefore, the present inventors conducted intensive studies to obtain a bleach composition containing magnesium monoperphthalate with stable performance, and found that when magnesium monoperphthalate is blended with a specific anhydrous salt and an alkaline agent, each component The present invention was completed based on the discovery that the influence of the particle size distribution is so large that it is not seen in ordinary bleach compositions, and that an excellent bleach composition can be obtained by having a specific particle size distribution.

That is, the present invention provides anhydrous magnesium sulfate, anhydrous calcium chloride,
It is characterized by containing three components: one or more selected from anhydrous sodium sulfate and anhydrous sodium citrate, (c) sodium carbonate and/or sodium bicarbonate, and (a) / (bl / The ratio of fcl is 10010.5 to 5075 to 50, and the particle size distribution of the three components is (a) 150μ or less is 5% or less, 150μ to 350μ is 7 to 30%, and 350μ to 500μ is 15 to 409/.

500μ~710μ is 20~55% 710μ~1190μ is 10~40% 1190μ or more is less than 2% (b) 150μ or less is 5% or less 150μ~440μ is 35~60% 440μ~840μ is 30~55% 840μ or more is less than 5% (c) 5% or less is 88μ or less 88μ~150μ is 5~25% 150μ~350μ is 35~65% 350μ~500μ is 15~45% 500μ~710μ is 1-15% 710μ or more is 3% or less A bleach composition is provided.

What can be used as magnesium monoperphthalate is:
For safety reasons, it is limited to hexahydrate salts, but even if magnesium monoperphthalate hexahydrate is stored alone, it decomposes rapidly at high temperatures, resulting in a decrease in available oxygen and caking. This phenomenon is particularly remarkable when an alkaline agent such as sodium carbonate or sodium hydrogen carbonate is present. This is Mg
This is thought to be due to substitution between g + and Na''.

Magnesium monoperphthalate can be manufactured by Interosox Chemical Co., Ltd. as shown in the formula below.

Magnesium monoperphthalate by itself is acidic (approximately pH=3) at the concentration used. The bleaching effect of monoperphthalic acid is highly dependent on pH, reaching a maximum at pH-8;
Performance drops significantly near =3. Therefore, an alkaline agent is an essential ingredient when magnesium monoperphthalate is used for bleaching.

As the alkaline acid, either sodium carbonate, sodium bicarbonate, or both may be added at the same time, but the content is 5 to 50%, preferably 8 to 30%, based on magnesium monoperphthalate.

Possible methods for adding an alkaline agent include pre-mixing it in the bleach composition and using it together with an alkaline detergent during use, but most products use the former method due to its convenience. Therefore, creating a composition that is stable even in the presence of an alkaline agent is an essential condition for commercialization.

Magnesium monoperphthalate and sodium carbonate and/or
In addition, it has been found that only the specific anhydrous salts shown below contribute to stabilization in bleach systems combined with sodium bicarbonate.

The anhydrous salt that can be used in the present invention is one or more selected from the group consisting of anhydrous magnesium sulfate, anhydrous calcium chloride, anhydrous sodium sulfate, and anhydrous sodium citrate.

Industrially, it is difficult to obtain 100% anhydrous salts of these anhydrous salts, and the ones that are available have -partly crystal water.

That is, anhydrous here means substantially anhydrous, and refers to an average water content of 5% or less. The amount of anhydrous salt is 0.5% based on magnesium monoperphthalate.
-50%, preferably 5-30%.

The mechanism by which the specific anhydrous salts used as stabilizers used in the present invention exhibit their effects is unknown, but simply being an anhydrous salt is not a sufficient condition.

In other words, like these compounds, anhydrous sodium carbonate, anhydrous sodium tripolyphosphate, anhydrous sodium birophosphate, anhydrous trisodium phosphate, anhydrous sodium metasilicate, anhydrous sodium nitrilotriacetate, etc., which can take crystal water, are all The effect of the present invention was not shown.

By simply using these three components in combination, it is not possible to obtain a bleach composition that is excellent in storage stability in terms of effective oxygen and powder physical properties, and has stable properties, which is the objective of the present invention.

It is necessary that the particle size distributions of the three components used in the present invention are within the ranges described above.

If the particle size is too fine, the desired effect of the present invention cannot be obtained, and if the particle size is too large, problems of solubility and local decolorization of colors and patterns tend to occur. Furthermore, if the particle size distribution deviates from the above-mentioned particle size distribution, the composition is likely to undergo classification.

In addition to these essential components, the bleach composition of the present invention may contain any known bleach components as required. That is,
Surfactants such as anionic surfactants and nonionic surfactants, zeolites, polymer builders, enzymes, fragrances, coloring agents, or activities such as glucose-pentaacetate, tetraacetylethylenediamine, tetraacetylglycolyl, sodium acetoxybenzenesulfonate, etc. It can also contain a curing agent.

〔Example〕

The present invention will be described in detail below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 150g of the first composition was placed in a 300 cc polyethylene bottle with a gap as small as air vent and stored at 40°C for one month, and then storage stability was evaluated using the following method.

(2) Powder physical properties ○: No clumps ×: clumps (3) Bleaching rate Dissolve the compound in tap water at 20°C to a concentration of 0.5%. Gate PA door 114) 3
After immersion for 0 minutes, the bleaching rate was calculated using the following formula.

Reflectance of white cloth - Reflectance before bleaching 1) 4.5% for 150μ or less, 19.1% for 150-350μ, 26.1% for 350-500μ, 500
~710μ is 34.3%, 710~1190μ is 15
．． 0%, 1190μ or more is 1.0% 2) 150μ or less is 3.5%, 150-440μ is 44.3%, 440-840μ is 49.3%, 840μ
2.9% above 3) 2.4% below 150μ, 44.9% between 150 and 440μ, 49.9% between 440 and 840μ, and 840
2.8% of μ or more 4) 2.9% of 150 μ or less, 44.7% of 150 to 440 μ, 49.4% of 440 to 840 μ, 840
3.0% of μ or more 5) 1.0% of 150 μ or less, 45.9% of 150 to 440 μ, 51.8% of 440 to 840 μ, 840 μ
1.3% above 6) 365% below 88μ, 12.3% between 88μ and 150μ
%, 150-350 μ is 50.2%, 350-500
μ is 21.0%, 500-710μ is 10.3%, 7
10μ or more is 2.7% 7) 150μ or less is 1.5%, 150-440μ is 47.4%, 440-840μ is 49.9%, 840μ
1.2% above 8) 0.5% below 150μ, 150-440μ
46.3%, 440-840μ 51.3%, 840
1.9% above 9) 10.5% below 150μ, 150-350μ
25.1%, 350-500μ 26.2%, 500
~710μ is 28.3%, 710~1190μ is 9.7
%, 1190μ or more is 0.2% 10) 150μ or less is 12.1%, 150-440
μ is 50.8%, 440-840μ is 35.2%, 84
1.9% is 0μ or more 11) 20.1% is 150μ or less, 150-440
μ is 51.3%, 440-840μ is 28.6%, 8
0% for 40μ or more

Claims (1)

[Scope of Claims] (a) Magnesium monoperphthalate, (b) one or more selected from anhydrous magnesium sulfate, anhydrous calcium chloride, anhydrous sodium sulfate, and anhydrous sodium citrate, (c) sodium carbonate or/and contains three components of sodium hydrogen carbonate, and (a)/(b)/(c
) ratio is 100/0.5 to 50/5 to 50, and the particle size distribution of the three components is (a) 150μ or less is 5% or less 150μ to 350μ is 7 to 30% 350μ to 500μ is 15 to 40% 500μ to 710μ is 20 to 55% 710μ to 1190μ is 10 to 40% 1190μ or more is 2% or less (b) 150μ or less is 5% or less 150μ to 440μ is 35 to 60% 440μ to 840μ is 30 to 55% 840μ or more is 5% or less (c) 88μ or less is 5% or less 88μ to 150μ is 5 to 25% 150μ to 350μ is 35 to 65% 350μ to 500μ is 15 to 45% 500μ to 710μ is 1 to 15% 710μ or more is 3% or less A bleach composition characterized in that: