JPS6116319B2 - - Google Patents

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. 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 in combination with an oxygen bleach. However, oxygen bleaches that contain enzymes are particularly prone to enzyme deactivation, perhaps due to the nascent oxygen produced by the decomposition of oxygen bleaches, and cannot be kept stable for long periods of time. It was extremely difficult to keep it in place. The present inventors have found that by using soda percarbonate having a specific water content and adding an enzyme to the same, the deactivation of the enzyme can be significantly improved and the above-mentioned drawbacks can be solved, leading to the present invention. That is, the present invention is a bleach composition comprising soda percarbonate having a water content of 0.5% by weight or less 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, a method is to granulate sodium percarbonate produced by reacting a hydrogen peroxide solution with an aqueous sodium carbonate solution using water, and then evaporate the water by drying under reduced pressure to reduce the water content to 0.5% by weight or less. If an enzyme is added to soda percarbonate with a water content exceeding 0.5% by weight, enzyme deactivation will increase, so the water content of the soda percarbonate is extremely important. A particularly preferred water content is 0.1% by weight or less. The water content of sodium percarbonate is determined by titrating the hydrogen peroxide content in the sodium percarbonate with potassium permanganate, separately heating the sodium percarbonate at 160°C, and extracting the inorganic content from the heated residue using a solvent extraction method. The organic content can be easily determined by subtracting the organic content from the total amount of sodium percarbonate. In order to increase the decomposition stability of soda percarbonate,
Particularly preferred is one containing 0.005 to 2% P ₂ O ₅ of phosphoric acid or its salt and 0.01 to 1% Mg salt of Mg salt. In other words, specific amounts of phosphoric acid and Mg salt have the effect of suppressing the decomposition of sodium percarbonate, and are therefore particularly preferable from the standpoint of storage stability of the sodium percarbonate itself and from the standpoint of improving the stability of the enzyme. be. Examples of phosphoric acid (salt) include phosphoric acid (H ₃ PO ₄ ), pyrophosphate (M ₄ P ₂ O ₇ , M′ ₂ P ₂ O ₇ ), and metaphosphate (MPO ₃ , M′(PO ₃ )). O ₂ ), triphosphate (M ₅ P ₃ O ₁₀ , M′ ₅ (P ₃ O ₁₀ ) ₂ ), phosphate (M ₃ PO ₄ ,
M′ ₃ (PO ₄ ) ₂ ) etc. However, M represents an alkali metal and 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 silicates, metasilicates (M ₂ Sio ₃ ,
M′SiO ₃ ), silicate (M ₄ SiO ₄ , M′ ₂ SiO ₄ ), sesquisilicate (M ₆ Si ₂ O ₇ , M′ ₃ Si ₂ O ₇ ), No. 1 silicate (M ₂ Si ₂ O ₅ , M′Si ₂ O ₅ ), No. 2 silicate (M ₄ Si ₅ O ₁₂ , M′ ₂ Si ₅ O ₁₂ ), No. 3 silicate (M ₂ Si ₃ O ₇ , M′ Si ₃ O ₇ ), etc. However, M represents an alkali metal and M' 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, and enzymes that transfer groups from one molecule to another and stain transferases that denature and promote removal; ligases and lyases that break down intermolecular bonds and decompose dirt to promote removal; and enzymes that isomerize molecules and chemically denature dirt to promote removal. Among these, hydrolytic enzymes are preferred, and among the hydrolytic enzymes, proteases are particularly preferred. Examples of proteases include serine protease, pepsin, trypsin, chymotrypsin, collagenase, keratinase, esterase, subtilisin, papain, carboxypeptidase A and B aminopeptidase. A preferred protease is a serine protease. These products include, for example, ``Alcalase'': Novo Industries, Ltd. ``Esperase'': Novo Industries, Ltd. ``Viroplase'': Nagase Sangyo Co., Ltd. ``Maxatase'': Gist Brocades ``ALP-2'': Meiji Seika Co., Ltd. ) "Sperase": easily available as a commercial product from Pfizer Inc., etc. If enzymes are added, the amount in the bleaching agent is 0.01 to 5% by weight.
The range is preferably 0.1 to 3% by weight, particularly 0.1 to 3% by weight. According to the product of the present invention, even if it is left in a humid place for a long time, the decomposition of sodium percarbonate and the deactivation of the enzyme are small, so it can be used to wash clothes, etc.
When bleached, the effects of the sodium percarbonate and enzymes are fully demonstrated, resulting in excellent cleaning and bleaching effects. In addition to the above-mentioned essential ingredients, the product of the present invention contains known additives such as anionic surfactants, nonionic surfactants, inorganic/organic builders, fragrances, pigments, and fluorescent agents to the extent that they do not promote enzyme deactivation. Can be added. Next, the present invention will be explained with reference to examples. Example Sodium orthophosphate and magnesium sulfate in the amounts listed in Table 1 were added to the reaction mother liquor in which a hydrogen peroxide solution and a sodium carbonate aqueous solution were reacted to cause reaction, crystallization, filtration, granulation, and hot air. Bleach compositions No. 1 to No. 4 consisting of 99 parts by weight of sodium percarbonate and 2.0T 1 part by weight of Alcalase, dried under reduced pressure at room temperature after drying.
Each is manufactured and stored sealed in a plastic container bottle.
After being stored at 45°C for 30 days, the residual activity of the enzyme was determined by the Casein-275mμ absorption method. In addition, the effective oxygen reduction rate was calculated using the following formula. Effective oxygen reduction rate = (initial available oxygen) - (available oxygen after 30 days) / (initial available oxygen) x 100 (%) Furthermore, the moisture in sodium percarbonate can be determined by titrating hydrogen peroxide with potassium permanganate. The additives and soda carbonate were determined by heating at 160°C for 4 hours, and the residue was determined as water.

[Table] From Table 1, when using soda percarbonate with a water content of 0.5% or less (Nos. 1, 2, and 4), 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 characterized by containing an enzyme and soda percarbonate having a moisture content of 0.5% by weight or less. 2 Sodium percarbonate is 0.005 to 2.0% by weight in terms of P ₂ O ₅
of phosphoric acid or its salt and Mg equivalent: 0.01 to 1
A composition according to claim 1, which contains % by weight of magnesium salt.