JPS5915498A - Oxygen containing bleaching composition - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bleach composition containing sodium percarbonate and an enzyme, and in particular provides a bleach composition that suppresses deactivation of the enzyme over a long period of time and has excellent storage stability. be.

Peroxygen compounds, represented by sodium percarbonate, can be used with more types of fibers than chlorine bleaches such as hypochlorite, can be used for colored and patterned fabrics, and have the unique properties of chlorine bleaches. It has excellent properties such as being odorless, and has come to be widely used as an oxygen bleach.

However, oxygen bleach is less effective than chlorine bleach in bleaching various stains on clothing, so attempts have been made to improve the bleaching effect, especially on protein, oil, and starch stains that are known to be difficult to remove. A known method is to use an enzyme together with an oxygen bleach.

However, oxygen-based bleaches that contain enzymes are particularly prone to enzyme deactivation, probably due to the nascent oxygen produced by the decomposition of the oxygen-based bleaches. was extremely difficult.

The present inventors found that by using soda percarbonate having a specific water content and adding an enzyme to it, the deactivation of the enzyme was significantly improved, which solved the above drawbacks, and led to the present invention. . That is, in the present invention, the water content is 0.5% by weight.
A bleach composition comprising the following sodium percarbonate and an enzyme.

Sodium percarbonate having a water content of 0.5% by weight or less used in the present invention can be produced by various methods. For example, sodium percarbonate produced by reacting a hydrogen peroxide solution with a sodium carbonate aqueous solution is granulated using water, and then the water is evaporated by drying under reduced pressure to reduce the water content to 0.5% by weight or less. be. If enzymes are added to soda percarbonate with a water content exceeding 0.5% by weight, enzyme deactivation will increase.
The water content of soda percarbonate is extremely important. A particularly preferred water content is 0.1% by weight or less.

The aqueous dispersion of sodium percarbonate is determined by titrating the hydrogen peroxide atom in sodium percarbonate with potassium permanganate, separately heating the sodium percarbonate at 160C, and extracting the inorganic content from the heated residue using a solvent extraction method, etc. It can be easily determined by calculating the organic content and subtracting it from the total amount of sodium percarbonate. In order to improve the decomposition stability of sodium percarbonate, add phosphoric acid or its salt to 0.005 p, o. Particularly preferred are those containing 0.01 to 1% of M and P salts as M9. In other words, the specific key phosphoric acid and MII salt have the effect of suppressing the decomposition of sodium percarbonate, so they are particularly preferable from the viewpoint of the storage stability of the sodium percarbonate itself and from the viewpoint of improving the stability of the enzyme. ◇ Phosphoric acids (salts) include phosphoric acid (H, PO4), -rophosphate (M4P10y, MGpgov),
) phosphates (MPO,, M'(POI)! ), triphosphates (M, P, O, .

ME (P@0so)t), phosphate (M, PO,
, MQ(PO4), ), etc. However, M represents an alkali metal, M/ represents an alkaline earth metal, and soda salt is particularly preferred.

Suitable magnesium salts include magnesium chloride and magnesium sulfate. In addition to these, addition of silicates is also preferred.

As the silicate, metasilicate (Mz8101tM'
S 10. ), silicate (M, 8 to4. ]s
5o4), sesquisilicate (M, 8110., M≦
si, o,), No. 1 silicate CM2S 1t Os e
M'S l*Os), No. 2 + IM Salt (M4S
1iot*vM; Sl, 0. , ), No. 3 + IH salt (
M, s sso, l M'S l, O,), etc.

However, M represents an alkali metal and y represents an alkaline earth metal, with soda salt being particularly preferred.

As for the method of adding these, it is particularly preferable to add them at the reaction stage or granulation stage of hydrogen peroxide solution and granular sodium carbonate or aqueous sodium carbonate solution during the production of soda percarbonate.

Enzymes that can be incorporated into the bleach composition of the present invention include hydrolytic enzymes that promote the addition and removal of water; oxidoreductases that promote redox; transferase, which alters dirt and promotes its removal;
Lyases, enzymes that isomerize molecules and chemically alter soils to facilitate removal, can be used; among these, hydrolytic enzymes are preferred, and among the hydrolytic enzymes, proteases are particularly preferred. - Specific examples of proteases include serine zotease, pepsin, trypsin, chymotrigisin, collagenase, keratinase, esterase,
These include subtilisin, papain, calxoxypeptidase A and B aminopeptidases. A preferred protease is serine p-tease. These products include, for example, ``Alcalase'', ``Esperase'' by Ninoze Industry Co., Ltd.; ``B4plase'' by Nose Industry Co., Ltd.; ``Maxatase'' by Nagase Sangyo Co., Ltd.; ``At, p
-2J" Meiji Seika Co., Ltd. "Sperase": 7 Easily available as a commercial product such as Aisa Ichisha. When blending an enzyme, the blending amount in the bleaching agent is preferably in the range of 0.01 to 5% by weight, particularly preferably o, i to 3% by weight.

According to the product of the present invention, even if it is left in a humid place for a long period of time, the decomposition of sodium percarbonate and the deactivation of the enzyme are small, so when washing or bleaching clothes etc. with this product, the percarbonate The effects of soda and enzymes are fully demonstrated, and it has excellent cleaning and bleaching effects.

In addition to the above-mentioned essential components, the product of the present invention contains known additives, such as anionic surfactants, as long as they do not promote enzyme deactivation.
Nonionic surfactants, inorganic/organic pilates, fragrances, pigments, and fluorescent agents can be added.

Next, the present invention will be explained with reference to Examples.

Example: To a reaction mother liquor in which aqueous hydrogen peroxide and an aqueous sodium carbonate solution were reacted, sodium orthophosphate and magnesium sulfate were added in the amounts shown in Table 1 to cause a reaction, crystallization, filtration,
Sodium percarbonate 99 dried under reduced pressure at room temperature after granulation and hot air drying
Alcalase 2. Bleach compositions 1 to A4 each containing 1 part by weight of OT were prepared, sealed in a plastic container, and stored in 45G for 30 days.The residual rate of enzyme activity was determined by the Caseim-275 mμ absorption method. In addition, the effective oxygen reduction rate was calculated using the following formula.

Furthermore, the water content in sodium percarbonate was determined by titrating hydrogen peroxide with potassium permanganate, and the additives and sodium carbonate were determined by titrating hydrogen peroxide with potassium permanganate.
It was determined by heating at 60G for 4 hours, and the residue was taken as water.

Table 1 Table 1 shows that when sodium percarbonate having a water content of 0.5% or less (A1p2t4) is used, enzyme deactivation can be significantly suppressed. Similar results were also obtained when phosphoric acid or phosphate salts described in the text other than sodium orthophosphate and magnesium salts other than magnesium sulfate were added.

Claims (1)

[Scope of Claims] 1. An enzyme-containing bleach composition 0 characterized by containing an enzyme and sodium percarbonate having a moisture content of 0.6% by weight or less. 2. Sodium percarbonate is expressed in terms of p, o, So, o, oos~2.
0% by weight of phosphoric acid or its salt and 0.0% in terms of Mg.
The composition according to claim 1, which contains 0.01 to 1% by weight of magnesium salt.