Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using disinfecting or sterilizing substance
Patent
1995-06-21
1996-08-13
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using disinfecting or sterilizing substance
510218, 510234, 510372, 514557, 25218642, A61L 218, A01N 3716
Patent
active
055453740
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns microbicidal compositions. More specifically, the present invention concerns peracid microbicidal compositions, and still more specifically, peracid microbicidal peracid compositions having activity over a broad pH range.
The use of aliphatic peracids as microbicides is well known in the art. Such solutions have found favor because they offer a microbicidal system which has reduced environmental impact and are completely biodegradable. For example, European patent application 0 193 41 6 discloses peracetic acid compositions comprising simple, non-capped alcohol ethoxylates. It has also long been recognized that the microbicidal activity of aliphatic peracids is strongly dependant on the pH at which the peracid is employed, and that the activity decreases as the pH increases. This is particularly evident as the pH of the peracid solution approaches neutral pH. Accordingly, the most effective use of aliphatic peracid microbicides has hitherto occurred at acidic pH. A number of systems require disinfection at alkaline pH or exist in their natural state at alkaline pH, and are thus not well suited to disinfection by such peracid-based microbicides. It remains an ongoing desideratum to identify peracid-based microbicide compositions having activity over a broader and/or higher pH range.
It is an object of certain aspects of the present invention to provide aliphatic peracid microbicide compositions having improved activity over a broader and/or higher pH range.
It is a further object of some or other aspects of the present invention to provide microbicidal compositions having improved activity against gram negative bacteria over a broader and/or higher pH range.
BRIEF SUMMARY OF THE INVENTION
According to the present invention, there are provided peracid compositions having microbicidal activity over a broad pH range, characterized in that they comprise an effective amount of a peracid and an ethoxylated and propoxylated alcohol nonionic surfactant according to the general chemical formula (1): represent an integer.
According to a second aspect of the present invention, there is provided a microbicidal process employing as microbicide an effective amount of a peracid and an ethoxylated and propoxylated alcohol nonionic surfactant, characterised in that the nonionic surfactant has the general formula: represent an integer.
DESCRIPTION OF PREFERRED EMBODIMENTS
By employing the selected nonionic alkoxylated alcohol surfactant of formula (1), it has been found that the effectiveness of peracid microbicides is enhanced at treatment pHs of above pH 6, i.e. in approximately neutral or mildly alkaline pH conditions, thereby extending advantageously the effective treatment range for the peracids.
In formula (1), R often contains from about 6 to about 18 carbons, and especially from about 8 to about 12 carbons and in many instances comprises a linear group. R can be synthetically derived, or can be obtained from natural sources, for example, from tallow. The weight proportion of alkoxylate i.e. ethoxylate or the total of ethoxylate and propoxylate in the surfactant is often selected in the region of about 55% to about 90%; n+p in formula (1) in many instances totalling from 4 to 20.
It will be recognized that compositions according to the present invention can be supplied in a number of different forms or can be produced immediately prior to use depending, for example, on the particular composition desired, or on the particular application. For instance, in certain embodiments of the present invention, the composition is in the form of a ready-to-use solution which can be used without requiring dilution. In certain other embodiments, the composition is in the form of a concentrated solution which may be employed without dilution, but is primarily intended for dilution prior to use. In further embodiments, the components are provided as a two pack system, with the first solution comprising aqueous peracid solution and optionally a fraction of the nonionic s
REFERENCES:
patent: 4783278 (1988-11-01), Sanderson et al.
French Madeline S.
Harvey Anita J.
Snider Theresa T.
Solvay Interox Limited
Warden Robert J.
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