Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Biocides; animal or insect repellents or attractants
Reexamination Certificate
2000-02-07
2002-04-09
Levy, Neil S. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Biocides; animal or insect repellents or attractants
C424S406000, C424S605000, C424S709000, C424S718000, C514S557000, C514S558000, C514S560000, C514S722000, C514S723000, C510S199000, C510S218000, C510S219000, C510S234000
Reexamination Certificate
active
06368610
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
A subject matter of the present invention is a cleaning and disinfecting composition of particular use in the cleaning and disinfecting of pipes and vessels of plants in the food industry, in particular the brewing industry, dairy industry, and the like.
2. Description of the Related Art
Compositions for cleaning and disinfecting plants in the farm produce industries are mainly used in systems known as “cleaning in place” (CIP) systems, according to which the plant is cleaned and disinfected without being disassembled, the disinfecting cleaning composition being circulated in the plant by pumping and/or applied by spraying (by means of permanently installed sprayers), so as to reach all parts of the plant to be treated.
In order to be applicable in a truly satisfactory manner in the food industry and more particularly in the brewing industry, such a disinfecting composition must combine several properties and must meet several requirements which it is difficult to satisfy simultaneously.
A solution for use prepared by dilution of such a composition must in particular have a satisfactory microbiocidal action, both with regard to gram+ and gram− bacteria and with regard to yeasts, such as Saccharomyces, Candida, and the like. A satisfactory microbiocidal effect is considered to have been obtained when the initial population of microorganisms is reduced by a factor of 10
5
in less than 20 minutes at 3° C.
Such a solution for use must also be non-foaming or, in any case, exhibit very little foaming. This is because the formation of foam can result in cavitation of the pumps of the CIP system, causing non-circulation of the disinfecting solution and possibly destroying the pumps. In addition, the formation, even modest, of foam can result in difficulties during rinsing.
Such a solution for use must also have a good cleaning and optionally descaling power and be fully rinsable, that is to say without risk of specific adsorption on the surfaces of the materials commonly encountered in plants in the food industry.
The concentrated composition must be stable and homogeneous.
The solution for use prepared by dilution of this concentrated composition must also itself be homogeneous and sufficiently stable to allow it be recovered. This is because the solutions for use used in a CIP system are recovered after use and collected in storage tanks in order to be reused during a subsequent cleaning and disinfection operation on the plant.
Before a fresh use of a recovered solution for use, the concentration of this solution should generally be readjusted by the addition of a certain amount of the concentrated composition. It is consequently important for the concentration of the solution for use to be able to be easily measured continuously. When the solution for use comprises a constituent such as a strong acid, the concentration of active constituents in the solution is very easily measured by measuring the electrical conductivity of the solution, since this conductivity is approximately proportional to the concentration of strong acid, which concentration is proportional to that of the other active constituents of the solution for use.
Numerous compositions for cleaning and/or disinfecting plants in the agricultural and food industries have already been provided.
EP-A-0,147,102 discloses an antimicrobial composition comprising an inorganic acid and/or an organic acid, an &agr;-halogenated acetic acid and a linear or branched aliphatic fatty acid.
An antimicrobial composition which essentially comprises an aliphatic alcohol having from 6 to 12 carbon atoms and an aliphatic acid having from 2 to 6 carbon atoms, which acid is substituted at the &agr;-position by a chloro, iodo, cyano, nitro, amino, imino, thiohydroxyl or hydroxyl radical, is known from EP-A-0,208,403. This composition can also comprise an organic or inorganic acid.
EP-A-0,524,075 discloses a disinfecting acid composition based on phosphoric acid and optionally on hydroxyacetic acid comprising a specific nonionic surface-active agent and an anionic hydrotropic agent of the arylsulfonate or alkylsulfonate type.
A dilutable disinfecting cleaning composition comprising a fatty acid, a hydrotropic agent of the type of surface-active sulfonates, a strong acid and a stabilizing agent consisting of propionic acid, butyric acid, valeric acid or a mixture of these acids, is known from WO 94/10837.
Disinfecting and cleaning compositions for the food industry are known from the document EP-A-0,245,928, these compositions comprising a monocarboxylic or dicarboxylic acid, a solubilizing agent, a diluent and an acid or a mixture of acids, in order to ensure a pH of less than 5. As specified in the document EP-B-0,245,928, the solubilizing agent must be an agent of the alkylated N,N-dimethylamine oxide type with 8 to 10 carbon atoms in the alkyl part in order for the composition to be stable and not very foaming.
SUMMARY OF THE INVENTION
It has now been found that compositions not comprising this solubilizing agent are stable and not very foaming and have an excellent effectiveness in combating bacteria and yeast. Furthermore, the compositions according to the invention can be easily discharged from the vessels and pipes by rinsing, so that any risk of detrimental change in the taste or flavor of the foodstuff by the presence of traces of compositions according to the invention can be avoided. The compositions according to the invention are therefore fungicidal and bactericidal compositions of low toxicity.
The disinfecting composition according to the invention, which is provided either in concentrated form or in dilute form, is a liquid composition comprising:
(a) a monocarboxylic acid of formula
R—COOH
with R a saturated or unsaturated, straight- or branched-chain alkyl radical comprising from 6 to 12 carbon atoms (preferably from 8 to 10 carbon atoms), or a mixture of such carboxylic acids;
(b) a strong inorganic acid,
(c) an organic acid of formula:
R′CH
2
—CO
2
H
with R′: H or OH,
or a mixture of such organic acids;
(d) one or more anionic surfactants;
(e) a solubilizing agent consisting of a compound of formula:
R″O(CH
2
CH
2
O)
x
—H
in which
R″ represents a C
2
to C
6
alkyl radical,
x represents an integer from 1 to 3, or a mixture of such compounds;
(f) water.
The composition according to the invention is a bactericidal and fungicidal composition.
According to one embodiment of the concentrated composition, it comprises:
(a) from 0.25 to 20% by weight of a monocarboxylic acid of formula:
R—COOH
with R a saturated or unsaturated, straight- or branched-chain alkyl radical comprising from 6 to 12 carbon atoms, or of a mixture of such carboxylic acids;
(b) from 20 to 40% by weight of a strong inorganic acid;
(c) from 0.25 to 7% by weight of an organic acid of formula:
R′CH
2
—CO
2
H
with R′: H or OH,
or from 0.5 to 12% by weight of a mixture of such organic acids;
(d) from 5 to 20% by weight of anionic surfactant(s), and
(e) from 1 to 10% by weight of a solubilizing agent consisting of a compound of formula:
R″O(CH
2
CH
2
O)
x
—H
in which
R″ represents a C
3
to C
5
alkyl radical,
x represents an integer from 1 to 3, or a mixture of such compounds.
In a particularly advantageous way, the composition comprises:
(a) from 0.5 to 15% by weight of a monocarboxylic acid of formula:
R—COOH
with R a saturated or unsaturated, straight- or branched-chain alkyl radical comprising from 6 to 12 carbon atoms, or of a mixture of such carboxylic acids;
(b) from 25 to 35% by weight of a strong inorganic acid;
(c) from 2 to 5% by weight of an organic acid of formula:
R′CH
2
—CO
2
H
with R′: H or OH,
or from 5 to 10% by weight of a mixture of such organic acids;
(d) from 7 to 13% by weight of anionic surfactant(s), and
(e) from 3 to 7% by weight of a solubilizing agent consisting of a compound of formula:
R″O(CH
2
CH
2
O)
x
—H
in which
R″ represe
Herman Ferdinand
Loncin Paul-Eric
Velings Nicolas
Levy Neil S.
SOPURA S.A.
Spencer George H.
Venable
Wells Ashley J.
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