JPH0353360B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bleach composition containing an inorganic peroxide and an enzyme, and more particularly to a bleach composition for clothing that suppresses enzyme deactivation and has improved storage stability. . Inorganic peroxides, such as sodium percarbonate, can be used for more fibers than chlorine bleaches such as hypochlorite, can be used for colored and patterned fabrics, and have the characteristic odor of chlorine bleaches. It has excellent properties such as being free from oxidation, and has become widely used as an oxygen bleach. However, oxygen bleaches are less effective than chlorine bleaches in bleaching various types of stains attached to clothing, so attempts have been made to improve the bleaching effect, especially for protein, oil, and starch stains that are known to be difficult to remove. A known method for removing stains is to use enzymes in combination with oxygen bleach. On the other hand, however, in oxygen bleaches containing enzymes, the enzymes are particularly susceptible to deactivation, making it extremely difficult to keep them stable for long periods of time. As a method of improving the storage stability of such enzyme-containing bleaches, it has been proposed to add a specific anhydrous salt, and although it has been found to be effective to some extent (Japanese Patent Laid-Open Publication No. 73100/1983) , nothing has been pointed out regarding its effect. As a result of intensive investigation into factors affecting the stability of enzyme activity in oxygen-based bleaches containing enzymes, the present inventors found that by incorporating calcium sulfate and calcium sulfate 1/2 hydrate, which have a crystal structure, storage stability can be improved. The present inventors have discovered that the present invention can be improved, and have completed the present invention based on this knowledge. That is, the enzyme-containing bleach composition of the present invention is characterized by containing the following components (A) to (C). (A) an inorganic peroxide, (B) an enzyme, and (C) at least one stabilizer selected from () to (). () Anhydrous calcium sulfate whose crystal form is hexagonal; () Calcium sulfate hemihydrate. Specific examples of the inorganic peroxide of component (A) include sodium percarbonate, sodium perborate, and sodium persulfate. Among these, sodium percarbonate is preferred because it has an excellent bleaching effect at low temperatures. For calcium sulfate, generally anhydrous salt, 1/2
Aquatic salts and dihydrate salts are recognized, and the crystal systems are classified into orthorhombic and hexagonal anhydrous salts, trigonal half-hydrate salts, and monoclinic dihydrate salts. The hexagonal anhydrous salt is called the soluble form of anhydrite. Among these, hexagonal anhydrous salts and trigonal hemihydrate salts specifically act as enzyme stabilizers. In the present invention, as a stabilizer, at least one of the above () to () is used, which has a specific effect on enzyme stability in the coexistence of an inorganic peroxide, and the amount of this stabilizer is (A ) ~ 0.1 in (C) component
~20% by weight is preferred, particularly preferably 0.5~5%
Weight%. If this amount is less than 0.1% by weight, the effect of addition is not necessarily sufficient, and if it exceeds 20% by weight, the amount of inorganic peroxide decreases, which is not preferable in terms of bleaching action. The enzyme used in the present invention includes water addition,
Hydrolytic enzymes that promote removal; oxidoreductases that promote redox; transferases that transfer groups from one molecule to another, altering the dirt and promoting removal; and cleavage of bonds between molecules to remove dirt. Suitable are ligases and lyases that decompose and promote removal, and enzymes that chemically alter stains and promote removal. Among these, hydrolytic enzymes are preferred, and among hydrolytic enzymes, proteases are particularly preferred. Specific examples of proteases include serine protease, pepsin, trypsin, chymotrypsin, collagenase, keratinase, esterase, subtilisin, papain, carboxypeptidase A and B, and aminopeptidase, and among these, serine protease is preferred. These enzymes can also be obtained as, for example, the following commercial products. Alcalase; Esperase, Novo Industries; Viroplase, Novo Industries; Maxatase, Nagase Sangyo; ALD-2, Gist Progedes; Sperase, Meiji Seika Co., Ltd. (C) 0.01 to 5% by weight of component
is appropriate. In addition to the above essential components (A) to (C), the present invention also includes anionic surfactants, nonionic surfactants, and nonionic surfactants to the extent that they do not promote enzyme deactivation or adversely affect inorganic peroxides. activators, inorganic or organic builders,
Various additives such as perfumes, pigments, fluorescent agents, etc. can be added. As explained above, according to the present invention, by adding anhydrous calcium sulfate or calcium sulfate 1/2 hydrate having a hexagonal crystal system to a bleach composition containing an inorganic peroxide and an enzyme, Enzyme deactivation can be suppressed and storage stability can be improved. Example: 79 to 98.9% by weight of sodium percarbonate, 1% by weight of enzyme (Alcalase 2.0T) and 0.1 to 0.1% of stabilizer
An enzyme-containing bleach composition containing 20% by weight was prepared, sealed in a plastic container bottle, and left to stand at 45°C for 30 days.
It was determined by Casein-275mμ absorption method. Table 1 shows the results.
Shown below. 【table】

Claims (1)

[Claims] 1 characterized by containing (A) anhydrous peroxide, (B) an enzyme, and (C) a stabilizer selected from anhydrous calcium sulfate and calcium sulfate 1/2 hydrate whose crystal system is a hexagonal system. Enzyme-containing bleach composition.