Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Patent
1997-05-12
1999-02-09
Lieberman, Paul
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
510376, 510501, 25218641, 8111, C11D 308, C11D 3395, C11D 718, C11D 754
Patent
active
058694404
DESCRIPTION:
BRIEF SUMMARY
DETAILED EXPLANATION OF THE INVENTION
1. Technical Field
This invention relates to a bleaching agent chiefly containing hydrogen peroxide and which is suitable for both domestic and industrial use. In detail, this invention relates to a bleaching agent having strong bleaching power and which is effective for cleaning, bleach-sterilizing and deodorizing, especially for mold-removal.
2. Background Art
Chlorine bleaches containing sodium hypochlorite have been conventionally used to remove mold. However, the strong odor of hypochlorite causes users discomfort when they use chlorine bleaches. In addition, toxic chlorine gas is generated when a chlorine bleach is mixed with an acidic detergent. On the other hand, hydrogen peroxide has no strong odor, and no chlorine gas is generated when hydrogen peroxide is mixed with an acidic detergent. Bleaches containing hydrogen peroxide are suitable for removing mold, but much weaker in bleaching power than the above-mentioned chlorine bleaches. Thus conventional bleaches containing hydrogen peroxide cannot satisfy consumer demands.
In order to improve the bleaching power of hydrogen peroxide, various methods have been tried to accelerate the decomposition of hydrogen peroxide. cyanamide and a Group IIA metal compound for activation of peroxide, use of both cyanamide and hydroxycarboxylic acid as activators. Japanese both cyanamid and a chelating agent such as EDTA as activators. Japanese acrylonitrile polymer, and Japanese Kokai Patent Application No. Sho --N(R).sub.2 } as an activator. Japanese Kokai Patent Application No. Sho isophthalonitrile or cyanates as activators. Japanese Kokai-Patent polymer as an activator. Japanese Kokai Patent Application Nos. Sho cationic group in the molecule as an activator.
The above-mentioned activators are used in a form of an aqueous solution, and they are mixed with peroxide at the point of bleaching to accelerate the decomposition of the peroxide. The aqueous solutions of activating agents are generally unstable, and in the two aqueous component system like the present invention, the activity is lost during storage and the bleach becomes no longer effective before use.
This invention has overcome the poor storage stability of the conventional products and provides an activation method for accelerating peroxide solution decomposition in alkali.
SUMMARY DISCLOSURE OF THE INVENTION
The object of the present invention is to provide an activation method to accelerate the peroxide decomposition using an alkaline solution with improved storage stability.
The inventors investigated the above-mentioned problems with the intent to a system using dicyandiamide and an aqueous sodium hydroxide solution is disclosed as a comparative example with unsatisfactory bleaching effects. The inventors investigated the peroxide-decomposing mechanism of dicyandiamide, then completed this invention.
This invention involves an activation method for a hydrogen peroxide bleach of two aqueous solutions, in which two solutions, that is, (1) a bleaching aqueous solution with hydrogen peroxide base, and (2) an aqueous solution chiefly containing a suitable amount of dicyandiamide for hydrogen peroxide activation and an organic builder and/or an inorganic builder are mixed and kept alkaline. Further, the present invention provides a bleaching composition comprising (1) a bleaching aqueous solution with hydrogen peroxide base, and (2) an aqueous solution chiefly containing a suitable amount of dicyandiamide for hydrogen peroxide activation and an organic builder and/or an inorganic builder.
BEST MODE FOR CARRYING OUT THE INVENTION
Conventional hydrogen peroxide solutions having concentrations of 0.1 to 90 wt %, preferably 0.5 to 35 wt %, can be used for the aqueous bleaching solution with hydrogen peroxide base. Solutions of hydrogen peroxide of various concentrations (from 3.0 to 60 wt %) are commercially available, but those higher than 6% are classified into the powerful drugs other than medicine under Japanese Regulation Law on toxicants and powerful drug
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Kobayashi Tsuneo
Mikami Masahito
Nakamura Shuzo
Bozek Laura L.
Lieberman Paul
Petruncio John M
S. C. Johnson & Son Inc.
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