AU2001263437A1 - Biocidal cleaner composition - Google Patents
Biocidal cleaner compositionInfo
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Description
BIOCIDAL CLEANER COMPOSITION
BACKGROUND OF THE INVENTION Eliminating pathogenic microorganisms on various hard or soft surfaces typically found in residential homes and institutional environments, especially where such organisms may stay active for relatively long periods of time, is critical to good cleaning and hygiene practices (S.F. Bloomfield and E. Scott, Appl. Microbiol. 83:1-9, 1997). Exemplary hard surfaces include counter-tops, bath tubs, sinks, drains, shower stalls and toilet bowls. Soft surfaces can be woven or nonwoven textiles such as shower curtain liners, clothing, carpeting and upholstery. There is a growing scientific recognition that bacterial organisms which actively populate these common surfaces may form organized communities called biofilms. Bacterial cells forming these biofilm communities assume a biological phenotype that is markedly different than their corresponding planktonic (non- surface attached) bacterial analogs (W.G. Characklis, "Microbial Biofouling Control" in Biofilms. Characklis and Marshall, eds., Wiley & Sons, 1990, J.W.
Costerton, Ann. Rev. Microb. 49:7110-7145, 1995). For example, current antimicrobial test methods for household cleaners employ a microbial inoculum of living planktonic bacteria.
One differentiating property between biofilm and planktonic bacteria is the greatly enhanced resistance to antimicrobial agents displayed by biofilm organisms. The significantly decreased susceptibility of biofilm cells to biocides has been documented in numerous recent studies. See for example: A.B. Ronner. et al.. J. Food Prot. 56:750-758. 1993; J.W. Costerton, supra. 1995, P. Gilbert and M.R.W. Brown, Microbial Biofilms. Lappin-Scott and Costerton, Eds., University Press, 1995; S. Oie, et a]., Microbios. 85:223-230, 1996; J.R. Das, et al.. Changes In Biocide Susceptibility of Bacteria Following Attachment to Surfaces, poster presentation, American Society of Microbiology Conference on Microbial Biofilms, Snowbird, Utah, 1997; C. Ntasama-Essomba, et at., Veter. 868, 28:353-363, 1997, J.W. Costerton. Intemat. J. Antimicrob. Agents 11 :217- 221 , 1999.
This enhanced resistance to biocides for biofilm bacteria has been documented for antimicrobial agents traditionally used in biocidal cleaners for the residential home and institutional environments, such as quaternary ammonium compounds and chlorine-based oxidizing agents. Sanitizing and disinfecting cleaners using biocidal actives such as these may not meet required levels of microbial kill when used according to label instructions to treat biofilm-containing soils.
Effective cleaning of biofilm contaminated surfaces in residential homes and commercial institutions is essential for the maintenance of good environmental hygiene, where soils attached to surfaces are likely to contain biofilms (S.F. Bloomfield and E. Scott, supra. 1997). Thus, there is a significant need for biocidal compositions, which display high sanitizing and disinfecting power against biofilm-based microorganisms. Such compositions should be "user-friendly", presenting minimal chemical hazard to the user. In addition, these cleaners should perform effectively under practical use conditions, such as short contact times and room temperature application. Ideally, such compositions would also be inexpensive, i.e., they would be largely aqueous in nature and utilize low cost reagents.
Specific biocidal compositions and/or methods for their use, which specifically address biocide resistant forms of bacteria, have been disclosed. For example, US patents 5,444,094 and 5,908,854 disclose biocidal compositions and related methods of use involving combinations of select solvents with quaternary ammonium compounds for biocidal cleaners effective against mycobacteria, such as M. tuberculosis. US patent 5,731 ,275 discloses aqueous cleaning and decontaminating compositions for use on biofilm coated surfaces. However, the cleaning and disinfecting conditions cited in 5,731 ,275 involve soaking the biofilm- contaminated surfaces in the inventive cleaning solutions for extended periods of time, typically 12 - 24 hours at room temperature. Such treatment conditions are unrealistic for most residential home and institutional cleaning applications where the user typically applies the biocidal product to the contaminated surface by spraying, followed by a short contact time (usually 10 minutes or less).
BRIEF SUMMARY OF THE INVENTION It is the principal object of the present invention to provide biocidal compositions highly effective at killing biofilm-bound microorganisms, which also address one or more of the above-mentioned technical formulation issues. It is a still further object of this invention to provide a method for the effective sanitizing or disinfecting of biofilm-contaminated surfaces, consisting essentially of contacting or treating said surface with the described compositions of this invention.
In one embodiment, the present invention is a method of substantially reducing biofilm microorganisms on a surface comprising the step of applying a composition comprising (a) between 0.01 % and 5% by weight of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl sulfonates, and aryl sulfonates with alkyl or aryl substituents; (b) between 0.01 % and 5% by weight of an acid, preferably a weakly acidic organocarboxylic acid; and (c) between 0.25% and 10% by weight of an alcohol solvent, preferably a monohydridic alcohol solvent. The pH of the composition is between pH 1 and pH 6, preferably between pH 2 and pH 4.
In a preferred version of the present invention, the anionic surfactant is present in an amount from about 0.01 to 2% by weight of the composition and is selected from the group consisting of sodium lauryl sulfate or sodium dodecylbenzene sulfonate.
In another preferred embodiment of the present invention, the acid is present in an amount of between about 0.1% to about 2% by weight of the composition and is selected from the group consisting of citric acid, lactic acid, glycolic acid, gluconic acid, glucoheptonic acid, malic acid, glutaric acid, succinic acid, adipic acid, formic acid, oxalic acid, acetic acid, propanoic acid, benzoic acid, phthalic acid, malonic acid, sorbic acid, fumaric acid, tartaric acid, and mixtures thereof.
In another preferred embodiment of the present invention, the solvent is present in an amount of about 0.5% to about 5% by weight of the composition and is selected from the group consisting of aliphatic or aromatic alcohols or a glycol ether.
The present invention is also a composition comprising (a) between 0.01% and 5% by weight of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl sulfonates, and aryl sulfonates with alkyl or aryl substituents, (b) between 0.01% and 5% by weight of an acid, and (c) between 0.25% and 10% of an aliphatic or aromatic alcohol or glycol ether solvent, wherein the pH of the composition is between pH 1 and pH 6.
Other objects, advantages and features of the present invention are apparent to one of skill in the art after review of the specification and claims. DETAILED DESCRIPTION OF THE INVENTION We have discovered that the use of particular anionic surfactants in combination with an effective amount of select acids and specific alcohol or glycol ether solvents provides a composition with strong biocidal properties that substantially reduce the number of microorganisms in biofilms. By "biofilms" we mean to include any of the systems described above in the Background section as biofilms and to also include systems described by similar terms such as "slime layer" and "biofouling."
This invention is directed to a method of cleaning and substantially reducing the biofilm microorganism contamination present on a substrate by the application of the antimicrobial solution of the present invention to the substrate by wiping, mopping, spraying, misting, dripping, or the like. (By "substantial reduction" we mean that the number of biofilm microorganisms is reduced by a log reduction of 4.0±0.5, preferably 34.5, at a contact time of 5 minutes or less compared to controls, as described below.) The method may comprise a single step of applying the solution onto the substrate without direct physical removal or may comprise both application and removal steps such as spraying followed by wiping with a cloth.
More particularly, this invention is directed to an antimicrobial composition comprising greater than 0.01% by weight of at least one anionic surfactant selected from the group of alkyl sulfates, alkyl sulfonates and aryl sulfonates with alkyl or aryl substituents. Preferably, the amount of anionic surfactant is between
0.05% and 5%. Most preferably, the amount of anionic surfactant is between 0.1% and 2%.
Preferred examples of surfactants include alkali metal or ammonium salts of n-alkyl sulfates, n-alkyl sulfonates, and aryl sulfonates with alkyl or aryl substituents.
Preferably, the surfactant is selected from the group consisting of:
(i) linear Cs to C-ι6 alkyl sulfates;
(ii) linear Cs to Ci6 alkyl sulfonates;
(iii) Cs to Ci6 alkyl benzenesulfonates; (iv) Cβ to Ci6 alkyl diphenyloxide disulfonates; and
(v) C to C-I6 alkylated naphthalene sulfonates.
The anionic surfactant is most preferably an n-alkyl sulfate such as sodium lauryl sulfate (hereinafter "SLS"), an alkyl benzene sulfonate such as sodium dodecyl benzene sulfonate (hereinafter "SDBS"), or mixtures thereof. Other exemplary anionic surfactants include dodecyldiphenyloxide disulfonate such as those sold under the tradename Dowfax 2A1® from The Dow Chemical Company, or sodium n-octylsulfonate such as Bioterge PAS-8® from the Stepan Company. Most preferably, the anionic surfactant is selected from those utilizing an alkali metal or ammonium cation, due to their relatively low cost. The most preferable alkali metal is sodium because of the widespread commercial availability and low cost of the sodium salts of these anionic surfactants.
The surfactant is combined with an effective amount of at least one acid to provide the composition with a pH between 1 - 6, preferably 2 - 4. The acid is selected from the group consisting of weak acids having a dissociation constant of about 1 x 10"2 to about 1 x 10"6 in water at 25EC.
Exemplary acids of the present invention include citric acid, lactic acid, glycolic acid, gluconic acid, glucoheptonic acid, malic acid, malonic acid, glutaric acid, succinic acid, adipic acid, formic acid, oxalic acid, acetic acid, propanoic acid, benzoic acid, phthalic acid, and mixtures thereof. Other suitable acids are polymeric organocarboxylic acids such as low molecular weight (molecular weight, average, Mw , below about 50,000) poly(acrylic acid) and poly(maleic)
acid homopolymers and copolymers such as Goodrite K-7058® available from BF Goodrich Speciality Chemicals and Belclene 901® available from FMC Corporation.
Other acids such as organo-phosphonic, and organo-sulfonic acids, and mineral acids are also acceptable. The main criteria here is that the pH of the antimicrobial composition (as used) is less than about 6, and ideally below about 4. The acid should be present at concentrations >0.01 %. The preferred range is about 0.05 to 5% by weight in the composition. The most preferred range is about 0.1 to 2% by weight in the composition. To minimize possible corrosion problems on certain household surfaces and potential safety issues associated with skin contact in acidic conditions, a pH in the range of between about 2 to 4 range is preferred. It is also believed that this pH range provides some cleaning efficacy against low to moderate levels of hard-water (mineral soil) stains. To the combination of surfactant and acid, one would add at least one aliphatic alcohol, aromatic alcohol or glycol ether solvent. Highly volatile, low molecular weight solvents are included in these aqueous solutions by the addition of ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, ort-butanol. Ideally the composition contains at least one alcohol or glycol ether, which is only sparingly soluble in water (soluble at less than 20% by weight in water) such as benzyl alcohol, n-butyl alcohol, ethylene glycol n-hexyl ether or propylene glycol n-butyl ether. The solvent(s) should be present at concentrations of about 0.25% or greater (in total). The preferred solvent concentration range is about 0.5-5% by weight in the composition. These solvents are employed to enhance the cleaning and antimicrobial properties of the compositions.
Exemplary solvents include n-propanol, n-butanol, benzyl alcohol, phenylethanol, and glycol ethers selected from the group consisting of the following formulae:
(I) R-O-CH2CH2-OH, where R is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl;
(II) R-O-(CH2CH2-O)2OH, where R is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl;
(III) R'-O-CH2CH-(CH3)OH, where R' is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl; and
(IV) R'-O(CH2CH-(CH3)O)2H, where R' is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl. Exemplary glycol ethers include ethylene glycol mono-butyl ether, available under the tradename Butyl Cellosolve® from Union Carbide Corp.; ethylene glycol monohexyl ether, available under the tradename Hexyl Cellosolve® from Union Carbide Corp., and ethylene glycol phenyl ether, available under the tradename Dowanol EPh® from The Dow Chemical Company. The solution may be combined by methods known to those of skill in the art. The solution can be aqueous or non-aqueous. Aqueous solutions are most preferred. The aqueous solution of this invention will generally contain an amount of water in the range from about 50 to about 99% w/w, and preferably, from about 85 to about 98% w/w. Other additives known in the cleaning and disinfecting arts may be included in the inventive solution. Such additives include, for example, viscosity enhancing agents, colorants, fragrances, preservatives and stabilizers.
EXAMPLES
A. Acid-Anionic Cleaning Compositions that Provide Biocidal Efficacy against Biofilm Organisms
Test Formulations:
Table 1 : Acidic Formulations
Table 2: Neutral Formulations
Table 3: Alkaline Formulation
Table 4: Standard Biocide Formulations
The concentrations are listed as percent active in the formulation.
These prototype formulations were evaluated for sanitizing efficacy versus model biofilms. The model biofilms were grown according to a method disclosed in U.S. provisional 60/138,354, incorporated by reference herein. This method was also subsequently published ("A Model Biofilm for Efficacy Assessment of Antimicrobials versus Biofilm Bacteria", Ursula K. Charaf, Shannon L. Bakich and Diane M. Falbo, in "Biofilms: The Good, The Bad and The Ugly." Contributions
made at the Fourth Meeting of the Biofilm Club held at Gregynog Hall, Powys, 18- 20 September, 1999, pp. 171-177). This method involves growing a biofilm on inoculated filter paper (Whatman qualitative #2) placed on top of 40 ml of Tryptic Soy Agar. The inoculum is prepared by first diluting a 24-hour culture of the desired biofilm forming organism 1/10 in phosphate-buffered saline solution. The filter paper is then inoculated with 1.0 ml of the diluted culture. Inoculum is pipetted onto the filter paper so that the entire paper surface is evenly moistened. Sterile glass coupons (slides) are aseptically placed on top of the inoculated filter paper and lightly pressed down. The biofilm is allowed to grow at room temperature. After approximately 24 hours, the biofilm is re-moistened with a 1/100 dilution of tryptic soy broth pipetted onto the exposed filter paper between the glass coupons. The slides are aseptically removed from the surface of the filter paper after 48±2 hours of growth. Each slide is placed on top of two pieces of filter paper, biofilm side-up, in a glass petri dish. The slides are then placed in a 35±2EC incubator to dry for 30 minutes. Following this drying period, the biofilm-covered slides are ready to be treated.
A 5-minute contact time was employed for each treatment using 4 - 6 slides per treatment. The biofilm-covered slides were sprayed with the treatment until thoroughly wetted (approximately 3 sprays/slide; approximately 3 ml of product). Following the 5-minute contact time, the slides were placed in a sterile jar containing 10 ml of 2X Letheen Neutralizing broth. The treatment procedure used is a modification of the current U.S. EPA Non-Food Contact Sanitizer Test (DIS/TSS-10). Any remaining biofilm was then removed from the slides by scraping directly into the neutralizing broth. (This is the first dilution.) The samples were then homogenized for 1 minute at ΛA maximal speed to disperse the cells. The cell suspensions were then serially diluted and plated on Tryptic Soy Agar. Cells surviving the treatment were counted as CFU's after 48 hours of incubation.
Efficacy was evaluated versus Staphylococcus aureus (ATCC No. 6538), Enterobacter aerogenes (ATCC No. 13048), and/or Klebsiella pneumoniae (ATCC No. 4352) biofilms. Parallel tests were run using a 0.01 % solution of Triton X-100 (isooctylphenoxy-polyethoxyethanol with 9-10 mole oxyethylene) in an identical manner to serve as a control. The results for the test solutions were compared to
the control and are reported as log reduction of the test organism versus the control counts. The log reductions were calculated according to the method described in "Calculating the Log Reduction and the Standard Error for Disinfection Studies - Formulas and Numerical Examples" (Hamilton, Martin A. and Heringstad, Becky E., Internal publication, Montana State University, Version 4, September 24, 1998.). A "3.00 log reduction" means that 99.9% of the organisms have been killed. Three untreated slides were also scraped into the neutralizing broth and processed in the same way as the treated slides. These serve as a control to determine the total number of cells per slide (108 to 109 cells per slide). Results:
Table 5: K. pneumoniae
Table 6: S. aureus
Table 7: E. aerogenes
Conclusions:
Acidic Compositions: Critical combinations of ingredients. Formulas 1 and 2 lack solvent and surfactant respectively. It becomes evident upon comparison of the log reductions achieved by these formulations to those achieved by formulations containing the combination of acid, surfactant and alcohol solvents (formulas 3, 4, 6, 7, 8, 9, and 10) that this latter combination is required to achieve good sanitizing efficacy against biofilm organisms. A log reduction of at least 4.0+0.5 is desired to obtain good sanitizing performance, however, a log reduction of 4.5 or greater is preferred under the test conditions. It
is also important to note that this combination is highly effective against biofilm organisms while conventional antimicrobial solutions such as quats or hypochlorite are largely ineffective (Formulas 20 and 21).
The nature of the solvent used is also critical to the formulation efficacy across a range of organisms. This is indicated by the results achieved by formula 5 which contained only 3.0% isopropanol solvent as opposed to the blend of glycol ethers used in the more efficacious formulations. While formula 5 was an effective biocidal composition against Staphylococcus aureus biofilm, biocidal performance against Klebseilla pneumoniae biofilm was poor. We believe the enhanced efficacy against a range of biofilm organisms arises from the inclusion of a sparingly water-soluble solvent, such as ethylene glycol n-hexyl ether, in the solvent mixture. Formulation pH is critical to formula efficacy.
As the pH of the formula increases, the efficacy decreases sharply. With the exception of pH, the composition of formulas 3, 7, and 8 are similar to that of formulas 15 through 19. Comparing the results obtained for the acidic formulas (3, 7, and 8) to those obtained for the pH neutral and higher formulas (15-19), it is evident that the acidic formulations are more effective biofilm sanitizing compositions than the higher pH formulations. Therefore, the preferred compositions of this invention would have a pH of about 6 or below. The most preferred compositions would have a pH of about 4 or below. The role of formulation pH in achieving antimicrobial efficacy against biofilm organisms does not appear to be organism specific, as similar results are seen for E. aerogenes, K. pneumoniae (both gram-negative), and S. aureus (gram-positive) biofilms.
INDUSTRIAL APPLICABILITY The present invention provides fast-acting biocidal compositions that effectively kill biofilm-bound microorganisms on a plurality of contaminated surfaces. The compositions may be produced by commercially available liquid manufacturing techniques and equipment. In addition, the inventive solutions may be applied conveniently to a contaminated surface by mopping, spraying, wiping and the like. Further, standard dispensers such as a trigger sprayer and impregnated wipes may be utilized.
Claims (23)
1. A method of substantially reducing the number of viable microorganisms within biofilm on a surface comprising the step of applying to the surface a composition comprising:
(a) between 0.01 % and 5% by weight of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl sulfonates, and aryl sulfonates with alkyl or aryl substituents; (b) between 0.01 % and 5% by weight of an acid; and
(c) between 0.25% and 10% by weight of an alcohol solvent, wherein the pH of the composition is between pH 1 and pH 6, and wherein a substantial fraction of viable organisms within the biofilm are killed.
2. The method of claim 1 wherein the anionic surfactant is selected from the group consisting of:
(i) linear C8 to C-ι6 alkyl sulfates;
(ii) linear Cs to Cιβ alkyl sulfonates; (iii) C8 to Ci6 alkyl benzenesulfonates;
(iv) CQ to Ci6 alkyl diphenyloxide disulfonates; and
(v) C to Ci6 alkylated naphthalene sulfonates.
3. The method of claim 1 wherein the acid is selected from the group consisting of weak acids having a dissociation constant of about
1 x 10"2 to about 1 x 10"6 at 25EC.
4. The method of claim 1 wherein the solvent is selected from the group consisting of aliphatic alcohols, aromatic alcohols, and a glycol ether.
5. The method of claim 1 wherein the anionic surfactant is present in an amount from about 0.05 to about 5% by weight of the composition.
6. The method of claim 1 wherein the anionic surfactant is present in an amount from about 0.1 to about 2% by weight of the composition.
7. The method of claim 2 wherein the anionic surfactant has an alkali metal or ammonium cation counterion of (i) to (v).
8. The method of claim 2 wherein the anionic surfactant is sodium lauryl sulfate or sodium dodecylbenzene sulfonate.
9. The method of claim 1 wherein the acid is selected from the group consisting of citric acid, lactic acid, glycolic acid, gluconic acid, glucoheptonic acid, malic acid, malonic acid, glutaric acid, succinic acid, adipic acid, formic acid, oxalic acid, acetic acid, propanoic acid, benzoic acid, phthalic acid, sorbic acid, fumaric acid, tartaric acid, and mixtures thereof.
10. The method of claim 1 wherein the acid is selected from the group consisting of low molecular weight poly(acrylic) acid, poly(maleic acid) homopolymers and copolymers, and mixtures thereof.
11. The method of claim 1 wherein the acid is present in an amount from about 0.05 to about 5.0% by weight of the composition.
12. The method of claim 1 wherein the acid is present in an amount from about 0.1 to about 2.0% by weight of the composition.
13. The method of claim 1 wherein the amount of solvent is in the range from about 0.5 to about 5% by weight of the composition.
14. The method of claim 1 wherein the solvent is selected from the group consisting of aliphatic alcohols, aromatic alcohols, and glycol ethers having a maximum solubility in water of about 20% by weight.
15. The method of claim 14 wherein the glycol ether is selected from the formulae:
(I) R-O-CH2CH2-OH, where R is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl; (II) R-O-(CH2CH2-O)2OH, where R is ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl;
(III) R'-O-CH2CH-(CH3)OH, where R' is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl; and
(IV) R'-O(CH2CH-(CH3)O)2H, where R is methyl, ethyl, propyl, butyl, pentyl, hexyl, phenyl, or benzyl; and mixtures thereof.
16. The method of claim 1 wherein the solvent is selected from the group consisting of n-butanol, benzyl alcohol, 2-phenylethanol, ethylene glycol phenyl ether, ethylene glycol n-pentyl ether, ethylene glycol n-hexyl ether, ethylene glycol benzyl ether, propylene glycol phenyl ether, propylene glycol benzyl ether, and propylene glycol n-butyl ether.
17. The method of claim 1 wherein the solvent is a mixture selected from a first group consisting of at least one completely water-miscible aliphatic alcohol or glycol ether, in combination with a second group consisting of at least one aliphatic alcohol, aromatic alcohol, or glycol ether having a maximum solubility in water of about 20% by weight.
18. A composition comprising (a) between 0.01 % and 5% by weight of an anionic surfactant selected from the group consisting of alkyl sulfates, alkyl sulfonates, and aryl sulfonates with alkyl or aryl substituents, (b) between 0.01 % and 5% by weight of an acid, and (c) between 0.25% and 10% of an aliphatic alcohol, aromatic alcohol or glycol ether solvent, wherein the pH of the composition is between pH 1 and pH 6.
19. The composition of claim 18 wherein the anionic surfactant is selected from the group consisting of:
(i) linear Cs to C-iβ alkyl sulfates; (ii) linear C8 to Ci6 alkyl sulfonates;
(iii) Cs to Ci6 alkyl benzenesulfonates; (iv) C-6 to Ci6 alkyl diphenyloxide disulfonates; and (v) C to C-16 alkylated naphthalene sulfonates.
20. The composition of claim 18 wherein the solvent is selected from the group consisting of aliphatic alcohols, aromatic alcohols, or a glycol ether.
21. The composition of claim 18 wherein the acid is selected from the group consisting of citric acid, lactic acid, glycolic acid, gluconic acid, glucoheptonic acid, malic acid, malonic acid, glutaric acid, succinic acid, adipic acid, formic acid, oxalic acid, acetic acid, propanoic acid, benzoic acid, phthalic acid, sorbic acid, fumaric acid, tartaric acid, and mixtures thereof.
22. The composition of claim 18 wherein the acid is selected from the group consisting of low molecular weight poly(acrylic) acid, poIy(maleic acid) homopolymers and copolymers, and mixtures thereof.
23. The composition of claim 18 wherein the solvent is selected from the group consisting of aliphatic alcohols, aromatic alcohols, and glycol ethers having a maximum solubility in water of about 20% by weight.
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PCT/US2001/017007 WO2001094513A1 (en) | 2000-06-05 | 2001-05-25 | Biocidal cleaner composition |
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- 2001-05-25 WO PCT/US2001/017007 patent/WO2001094513A1/en active IP Right Grant
- 2001-05-25 MX MXPA02012046A patent/MXPA02012046A/en active IP Right Grant
- 2001-05-25 EP EP01937730A patent/EP1287100B1/en not_active Revoked
- 2001-05-25 AT AT01937730T patent/ATE346901T1/en not_active IP Right Cessation
- 2001-05-25 AU AU2001263437A patent/AU2001263437B2/en not_active Ceased
- 2001-05-25 DE DE60124906T patent/DE60124906T2/en not_active Revoked
- 2001-05-25 JP JP2002502056A patent/JP2003535959A/en active Pending
- 2001-06-05 AR ARP010102674A patent/AR029935A1/en unknown
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2002
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