Compositions – Oxidative bleachant – oxidant containing – or generative – Free halogen or oxy-halogen acid type
Reexamination Certificate
2002-08-12
2004-09-21
Anthony, Joseph D. (Department: 1714)
Compositions
Oxidative bleachant, oxidant containing, or generative
Free halogen or oxy-halogen acid type
C252S187240, C252S187260, C252S187320, C510S302000, C510S303000, C510S367000, C424S661000, C422S037000
Reexamination Certificate
active
06793846
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a bactericide composition comprising hypochlorous acid or a salt thereof.
PRIOR ART
Conventionally, chlorine-based germicides such as sodium hypochlorite, calcium hypochlorite and sodium dichloroisocyanurate have been generally used in various environments as germicides and disinfectants. Among them, hypochlorites such as sodium hypochlorite are widely used, since these are advantageous in costs and effects, and there have been many proposals so as to further improve the effects thereof with respect to germicidal action and sterilizing action to microbes that are requested in various fields such as medical and food industries.
For example, JP-A No. 57-61099 has disclosed a liquid germicidal bleaching agent that comprises a hypochlorite, an alkali substance and a specific cationic surfactant of a quaternary ammonium salt type in respectively specific weight ratios.
JP-A No. 7-233396 has disclosed a germicidal washing agent for use in medical equipment such as artificial dialysis devices, which comprises a salt of hypochlorous acid, an alkaline substance and a cationic surfactant of a quaternary ammonium salt at specified weight ratios.
However, although conventional hypochlorite germicides are effective to general bacteria and mold (mycelia) to a certain degree, these fail to provide sufficient effects to virus having higher resistance to medicine, spores formed by rod-shaped bacteria and mold spores in the case of an easy operation.
Moreover, JP-A No. 11-148098 has disclosed a solid-state germicidal detergent containing an alkaline earth metal of hypochlorous acid like high test hypochlorite (calcium hypochlorite). This, however, has not disclosed anything about germicidal processes in a higher degree, and an alkaline earth metal such as calcium causes scales and scum, resulting in degradation in the germicidal effects.
Furthermore, JP-A No. 7-328638 has disclosed a method in which an agent for reducing surface tension is added to electrolytic acidic water so as to increase the adhering property to the outer surface of a germicide-subject substance; however, although this method is superior in the germicidal effects, it generates chlorine gas, causing a problem with safety.
Here, JP-A No. 59-93799 has disclosed a method in which amine oxide is blended in a liquid washing agent comprising a hypochlorite and an alkali substance.
Further, JP-A No. 59-98200 has disclosed a method in which amine oxide is used as a thickener for a bleaching agent comprising a salt of hypochlorous acid; however, these have not described anything about germicidal effects, that is, in particular, germicidal effects to spores and viruses having high resistance.
DISCLOSURE OF INVENTION
The object of the present invention is to obtain a bactericide composition capable of affording a high bactericidal effect while being excellent in safety and workability.
The present invention provides a liquid bactericide composition comprising an aqueous solution with pH (25° C.) of 3 to 8 comprising hypochlorous acid and/or a salt thereof (A), a surfactant (B) and a PH adjusting agent (C).
The present invention also provides a bactericide comprising a product (I) comprising hypochlorous acid and/or a salt thereof (A), a product (II) comprising a surfactant (B) and a product (III) comprising a pH adjusting agent (C), wherein the bactericide is prepared as an aqueous solution comprising (A) and (B) in a weight ratio (A)/(B) of 50/1 to 1/50 in use.
This means that the components (A), (B) and (C) can be used together as an aqueous solution at the time of its use. The aqueous solution preferably has a pH value of 3 to 8 at 25° C. or 20° C. Since the components (A) and (B) are separately preserved and transported until just before use, the bactericide has the excellent stability.
In other words, the present invention provides a method for using a bactericide in which the product (I) comprising hypochlorous acid and/or a salt thereof (A), the product (II) comprising a surfactant (B), and the product (III) comprising a pH adjusting agent (C) are prepared into an aqueous solution comprising (A), (B) and (C) so that the weight ratio of (A)/(B) is in the range of 50/1 to 1/50 just before use.
In this embodiment of use, the components (A), (B) and (C) may be combined as a kit. Alternatively the components(A), (B) and (C) may be, independently of each other, formulated into their respective individual products.
The present invention provides use and a sterilization method of the composition, the aqueous solution and the product kit. The method includes applying effective doses of them to a desired site or location for sterilization.
The preferable surfactant (B) comprises at least one of the surfactants selected from amphoteric surfactants, cationic surfactants and nonionic surfactants. Polyoxyalkylene alkylether and polyoxyalkylene phenyl ether are excluded from the preferable nonionic surfactants. Particularly preferable surfactants are at least one of the surfactants selected from the amphoteric surfactants, cationic surfactants and nonionic surfactant, such as a polyhydric alcohol derivative surfactant. A preferable amphoteric surfactant is an amine oxide.
A pH adjusting agent (C) is preferably an organic acid or a salt thereof, in particular a saturated dibasic acid or a salt thereof.
The ratio (A)/(B) is preferably in the range of 50/1 to 1/50, or 10/1 to 1/10.
The ratio (C)/(A) is preferably in the range of 5/1 to 1/10.
The component (C) may comprise the component (B) before use. In other words, the bactericide according to the present invention comprises a product (IV) comprising hypochlorous acid and/or a salt thereof (A), and a product (V) comprising the surfactant (B) and the pH adjusting agent (C), and is used as an aqueous solution comprising (A) and (B) in a weight ratio (A)/(B) in the range of 50/1 to 1/50.
The bactericide according to the present invention also comprises a product (VI) comprising hypochlorous acid and/or a salt thereof (A) and a surfactant (B), and a product (VII) comprising a pH adjusting agent (C), and is used as an aqueous solution comprising (A) and (B) in a weight ratio (A)/(B) in the range of 50/1 to 1/50.
The bactericide according to the present invention has an antimicrobial effect on viruses and spores formed by bacillus and fungi that are more resistant to chemicals. The bactericide is particularly useful in cleaning, disinfecting and deodorizing. The composition according to the present invention may also comprise a rust preventing agent.
The preferable weight ratio (C) (A) in the aqueous solution is in the range of 2/1 to 1/5, particularly in the range of 1/1 to 1/5.
The preferable weight ratio (A) (B) in the aqueous solution is in the range of 10/1 to 1/10, more preferably in the range of 5/1 to 1/5, and particularly in the range of 5/1 to 1/2 or 2/1 to 1/2. A range of 20/1 to 1/20 is also preferable. More preferably, the range is 20/1 to 1/5, and particularly 20/1 to 1/2. The content of (A) is denoted by a weight ratio based on the amount of available chlorine.
The aqueous solution preferably has a pH range of 3 to 8, more preferably 5 to 8, further preferably 5 to 7, particularly from 5 or more to less than 7, and more particularly from 6 or more and less than 7. The pH value of the solution may be adjusted by the pH adjusting agent that can be selected from an acid, an alkali and a buffering agent. The component (C) may have functions other than a function for adjusting the pH value. The component having such functions include a hydroxide of an alkali metal, a hydroxide of an alkaline earth metal, an inorganic acid or a salt thereof, and an organic acid or a salt thereof. Hydroxides of alkali metals and alkaline earth metals, and organic acids or salts thereof are preferable among them.
The component (C) is used in an amount for adjusting the pH value within the ranges as described above. A pH range of 3 to 8, preferably 5 to 8, more preferably 5 to 7, further preferably 5 or more to less than 7, and particularly 6 or more to less tha
Ito Sumitoshi
Matsuo Noboru
Okano Tetsuya
Tamura Shigeru
Yamazaki Yoshihiro
Anthony Joseph D.
Birch & Stewart Kolasch & Birch, LLP
Kao Corporation
LandOfFree
Microbicide compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Microbicide compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Microbicide compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3185270