Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – With oxygen or halogen containing chemical bleach or oxidant...
Reexamination Certificate
2002-06-24
2004-01-27
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
With oxygen or halogen containing chemical bleach or oxidant...
C510S372000, C510S433000
Reexamination Certificate
active
06683040
ABSTRACT:
The present invention relates to the use of peracid esters for improving surface wetting during the disinfection of surfaces and to synergistic antimicrobial combinations of peracid esters with further components.
It is known in the state of the art that peracid compounds, for example peracetic acid, can be used for disinfecting surfaces. Peracid compounds are very effective biocides. However, most peracids have an unpleasant odor, particularly when they are used in systems where people are exposed to the unpleasant odor.
It was therefore desirable to find alternative disinfecting ingredients. As disinfecting ingredients with an oxidative action mechanism can usually destroy germs within a short period of time, these ingredients could readily be used for disinfecting surfaces. The alternatives to peracid disinfecting ingredients with an oxidative action mechanism known in the state of the art, such as hypochlorite, ozone, chlorine dioxide, also have drawbacks in use, for example unpleasant odor, formation of ecotoxic compounds which may pollute the waste water, formation of gases which may be toxic to humans and difficult handling, production and stability.
The patent EP 765 309 relates to aqueous peracid ester solutions which are stable in storage and to the use thereof as disinfectants. According to the cited patent, these peracid ester solutions have less odor than the aliphatic C
1
to C
3
peracids conventionally used.
As a result, peracid ester solutions of this type can be used in areas where peracids were formerly avoided owing to their unpleasant odor.
The cited document therefore teaches us that the odor problem associated with conventional peracids can be solved by using peracid esters.
However, the document fail to mention that conventional peracids have a further serious drawback. The peracids conventionally used for disinfection have only low affinity with surfaces, which means that, when they are used in disinfecting processes, the disinfecting solutions adhere-to the surfaces to be treated only for a short time and then drip onto the floor or run off the surface to be treated. This rapid dripping or running means that the peracid solution has only a short period of contact with the surfaces to be treated and this adversely affects the resultant disinfection. To achieve optimum disinfection, it is desirable to lengthen the time for which the disinfecting ingredient is in contact with the surface to be treated. To achieve this object, surface-wetting aids are added in practice, for example during aseptic decanting. The preferred surface-wetting aids often lead to unstable formulations with peracid compounds. Furthermore, additional aids should be considered only as additional ballast in many cases, from the economic, ecological and toxicological points of view. There was therefore a need for oxidatively acting ingredients which, considered per se, wet surfaces better.
It was accordingly the object of the present invention to look for peracid compounds which have a particularly advantageous influence on the adhesion to and/or the wetting of surfaces in use.
The present invention relates to use of formulations containing at least one peracid ester of general formula
R—I
2
C—(CH
2
)
x
—CO
3
H
wherein R is an alkyl group containing 1 to 4 carbon atoms wherein it is preferred if R is a methyl group, and x is a number from 1 to 4, wherein it is particularly preferred if the formulations contain one or more peracid esters selected from persuccinic acid monomethyl ester, perglutaric acid monomethyl ester, peradipic acid monomethyl ester, and the formulation preferably contains 0.001 to 15% by weight, particularly preferably 0.1 to 5% by weight of one or more peracid esters, based on the total formulation, for achieving better surface welting with formulations of this type than with identical molar amounts of the corresponding peracids alone or combined with mole-equivalent amounts of the corresponding alcohol during the disinfecting and/or cleaning of surfaces. Preferably, with the use according to the invention there is a longer contact time between the formulations to be used according to the invention and the surface or surfaces which are not arranged horizontally when using identical molar amounts of the corresponding peracids alone or combined with mole-equivalent amounts of the corresponding alcohol. It is also preferred that a better antimicrobial and/or additional cleaning effect is achieved with use according to the invention than with the use of identical molar amounts of the corresponding peracids alone or in combination with mole-equivalent amounts of the corresponding alcohol. In a further preferred embodiment of the use according to the invention, it is possible, with a lower concentration and/or reduced unpleasant odor to achieve at least the same antimicrobial activity as when using identical molar amounts of the corresponding peracids alone or combined with mole-equivalent amounts of the corresponding alcohol.
It is also preferred if the formulations to be used according to the invention additionally contain 1 to 50% by weight of hydrogen peroxide, based on the total formulation.
Furthermore, it is preferred if the formulations to be used according to the invention additionally contain 0.1 to 25% by weight of at least one non-esterified peracid, based on the total formulation, and it is particularly preferred if a peracid selected from monoperoxycarboxylic acids and/or diperoxydicarboxylic acids is contained as non-esterified peracid, and it is quite particularly preferred if the non-esterified peracids present in the formulations used according to the invention are selected from peracetic acid, perpropionic acid, persuccinic acid, perglutaric acid, peradipic acid, (&ohgr;-phthalimidoperoxyhexanic acid, fatty peracid containing 8 to 18 carbon atoms per molecule or mixtures of the aforementioned peracids.
In a further preferred embodiment of the present invention, the formulation to be used according to the invention additionally contains 5 to 50% by weight of at least one organic acid, based on the total formulation, which is not a peracid and is preferably selected from acetic acid, propionic acid, succinic acid, glutaric acid, adipic acid, (o-phthalimidoperoxyhexanic acid, fatty acids containing 8 to 18 carbons atoms per molecule or mixtures of these acids.
It is also preferred if the formulation to be used according to the invention additionally contains at least one hydrotrope, and it is particularly preferred if the hydrotrope used is selected from the group consisting of anionic surfactants, quite particularly preferably from sulfonates/sulfonic acids and, in particular, from cumene, xylene, octyl, naphthyl and alkylbenzene sulfonates/sulfonic acids, the alkyl group containing between 6 and 16 carbon atoms in the last case, or mixtures of these compounds and/or further compounds which may be suitable as solubilizers for longer chain peracids.
It is also preferred if the formulations to be used according to the invention additionally contain at least one component with complexing properties for polyvalent metal ions. The formulations to be used according to the invention particularly preferably contain, as component with complexing properties, a compound selected from nitrilotriacetic acid, ethylenediamine tetraacetic acid, methylglycine diacetic acid, gluconic acid, citric acid, dicarboxymethyl-L-glutamic acid, serine diacetic acid, imidosuccinic acid, the polycarboxylic and phosphonic acid group and the respective salts thereof.
Examples of polycarboxylic acids include polyacrylic acids and copolymers of maleic acid anhydride and acrylic acid as well as the sodium salts of these polymeric acids. Conventional commercial products include Sokalan® CP 5 and PA 30 made by BASF, Alcosperse® 175 and 177 made by Alco, LMW® 45 N and SPO2 ND made by Norsohaas Suitable native polymers include oxidized starch (for example, DE 42 28 786) and polyamino acids such as polyglutamic acid or polyaspartic acid made by Cygnus, Bayer, Rohm & Haas, Rhône-Poulenc or SR
Bragulla Siegfried
Kluschanzoff Harald
Laufenberg Alfred
Boyer Charles
Ecolab GmbH & Co. oHG
Merchant & Gould P.C.
Petruncio John M.
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