AU2002330647A1 - Pesticidal formulations - Google Patents
Pesticidal formulationsInfo
- Publication number
- AU2002330647A1 AU2002330647A1 AU2002330647A AU2002330647A AU2002330647A1 AU 2002330647 A1 AU2002330647 A1 AU 2002330647A1 AU 2002330647 A AU2002330647 A AU 2002330647A AU 2002330647 A AU2002330647 A AU 2002330647A AU 2002330647 A1 AU2002330647 A1 AU 2002330647A1
- Authority
- AU
- Australia
- Prior art keywords
- water
- solution according
- pesticidal solution
- concentrated pesticidal
- lignin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Description
PESTICIDAL FORMULATIONS
This invention relates to pesticidal formulations and more particularly to concentrated solutions of water-insoluble pesticides. It also relates to the preparation of these concentrated solutions and their uses in water diluted form.
Pesticides which have a low solubility in water and which are chemically stable in water are commonly marketed in the form of aqueous suspension concentrates (SCs) and diluted for use in the field. The suspended pesticidally active ingredient needs to have a small particle size in order keep it suspended while stored as a concentrate and when diluted further with water. This normally requires the active ingredient to be milled, which can be time consuming and costly. Even so, problems are often encountered with suspension concentrates as a result of settling during prolonged storage, the resistance of settled particles to re- suspension and sometimes an increase in particle size of the active ingredient during storage. One alternative is to dissolve the water-insoluble active ingredient in a water immiscible solvent, such as an aromatic hydrocarbon, to form an emulsifiable concentrate (EC). This can be stored as a stable solution and diluted with water when ready for use to form a milky emulsion of small particle size. Water-insoluble pesticides that are not readily soluble in the normal water-insoluble solvents may be dissolved in a water miscible solvent to form a storage stable soluble concentrate (SL). The pesticide forms a suspension on dilution with water. Soluble concentrates of this kind are described in, for example,
WO 92/10937. These SLs are three component formulations in which a solid water insoluble pesticide and a dispersant are solubilised in a water miscible solvent. A range of dispersants are mentioned including alkylated vinylpyrrolidone polymers, ethylene oxide propylene oxide/propylene glycol condensates, nonylphenol ethylene oxide adducts, and various ethoxylates. The solvents include acetonitrile, -butyrolactone, dimethyl ketone, dimethylfuran, dimethyl sulphoxide, methanol and N-methyl pyrrolidone.
The drawback in using water-soluble solvents for dissolving active ingredients of low water solubility is their poor dilution properties in water. The active ingredient is often rapidly precipitated as coarse crystals giving both application problems, such as spray filter or nozzle blockage, and poor or inconsistent bioefficacy. To prevent, or, more usually, delay precipitation, an excess of emulsifying or dispersing agent, typically at a 1:1 ratio with the
active ingredient, needs to be incorporated and at these concentrations surfactants may give rise to phytotoxicity problems in their own right.
According to the present invention, there is provided a concentrated pesticidal solution which comprises one or more water-insoluble pesticides and lignin dissolved in a water miscible, polar solvent.
The pesticide or pesticides used in the solution concentrate of the invention are water insoluble and may be solid or liquid, but the invention is of particular value for pesticides that are solid at ambient temperature. Normally they will have a solubility in water of not more than 0.2% w/v. They must also be soluble in the chosen water miscible, polar solvent. The amount of pesticide or pesticides used will usually be from 0.5 to 50% w/v, more usually from 1 to 30% w/v, and typically from 5 to 20% w/v, of the total solution. Pesticides include herbicides, insecticides and fungicides. The invention is particularly suitable for any pesticide or mixture of pesticides having a solubility in water of not more than 0.2% w/v. Examples of pesticides for use in this invention are napropamide, haloxyfop, clodinafop-propargyl, mesotrione, cypermethrin, alpha-cypermethrin, beta- cypermethrin, cyproconazole, difenoconazole, hexaconazole, penconazole, tebuconazole, azoxystrobin, picoxystrobin, kresoxim-methyl, metominostrobin, picoxystrobin, pyraclostrobin, trifloxystrobin, cyprodinil, metalaxyl, mefenoxam, fluazinam, fludioxonil, paclobutrazol, thiabendazole and quinoxyfen. The invention is, however, particularly useful for fungicides, especially for triazole fungicides and strobilurin fungicides and for fungicidal mixtures, especially mixtures of a strobilurin fungicide, for example picoxystrobin, with a triazole fungicide such as hexaconazole or cyproconazole. Of particular interest are solution concentrates made from a fungicide selected from the group consisting of azoxystrobin, picoxystrobin, tebuconazole, cyproconazole, and picoxystrobin in admixture with cyproconazole.
By lignin is meant a lignin in its free acid state, and not an alkali metal salt of lignin, such as the sodium salt, or a lignosulphonate. Lignin, which is a phenyl propene polymer of variable molecular weight, may be obtained from the spent liquors of the sulphate and soda processes used in the wood pulping industry. A lignin so obtained is known as an alkali lignin and further designated a sulphate (or kraft) lignin or a soda lignin. Of particular suitability for use in the present invention is Indulin AT (Indulin AT is a trade name), which
is a highly purified lignin made from pinewood-sulphate black liquor and produced in the form of a free flowing brown powder.
The amount of lignin used in the solution concentrate of the present invention in relation to the amount of pesticide used is suitably in the weight ratio of from 1 : 10 to 1 : 1 , usually from 1:8 to 1:2, preferably from 1:6 to 1:4, and typically 1:5, of lignin to total pesticide.
Any water miscible polar solvent that can dissolve both the pesticide and lignin may be used in the invention. Suitable solvents include γ-butyrolactone, tetrahydrofurfuryl alcohol, N-methyl pyrrolidone, dimethyl sulphoxide, N,N-dimethylformamide and ethyl lactate. Preferred solvents are γ-butyrolactone and tetrahydrofurfuryl alcohol, and a particularly preferred solvent is N-methyl pyrrolidone. Mixtures of polar solvents may also be used, for example, a 50:50 mixture of N-methyl pyrrolidone and poly(ethylene glycol) 200. The amount of solvent used is sufficient to bring the total solution to 100% w/v.
Although not essential, the solution concentrate may include other additives, for instance, polymer stabilisers or anti-settling agents to improve dilution. Examples of suitable stabilisers or anti-settling agents include water soluble and water insoluble polymers such as ethyl cellulose, casein, hydroxy propyl cellulose, Avicel™ CL-611 (based on microcrystalline cellulose), Agrimer™ VEMA AΝ-216 (a vinylether maleic anhydride copolymer, MW 55,000 to 80,000), NU-FILM-P™ (poly-1-p-menthene) and Kelzan™ (a xanthan gum). Such additives are conveniently used in amounts up to 0.5% w/v, for example 0.1 to 0.4% w/v, typically 0.25% w/v, of the total formulation, depending on their solubility in the polar solvent used. For instance, the maximum amount of Avicel CL-611 and Kelzan that can be dissolved in a N-methyl pyrrolidone based concentrate is about 0.1% w/v.
In one embodiment the invention provides a concentrated pesticidal solution which comprises:
(a) from 1 to 30% w/v, usually from 5 to 30% w/v and typically from 10 to 20% w/v, of one or more water insoluble pesticides and
(b) lignin in the weight ratio oi from 1:10 to 1:1, usually from 1:8 to 1:2 and preferably from 1:6 to 1:4, typically 1:5, of component (a), both (a) and (b) being dissolved in (c) a water miscible, polar solvent, such as γ-butyrolactone, tetrahydrofurfuryl alcohol, ethyl lactate and, preferably, N-methyl pyrrolidone.
In this embodiment, the concentrated solution optionally contains up to 0.5% w/v of other additives, such as a stabiliser or antisettling agent like ethyl cellulose.
The concentrated solution of the invention is prepared by dissolving the pesticide or pesticides, the lignin and, optionally, a stabiliser or other additive in the polar solvent. The ingredients may be added to the solvent in any order. Usually this is done at ambient temperature with suitable agitation or stirring. To assist dissolution, the solvent may be heated to temperatures up to, for example, 50°C.
When ready for use, the concentrated solution is diluted with water, usually by adding the solution to a stirred volume of water to give an aqueous dispersion of the pesticide or pesticides containing, for example, from 0.0001 to 1% w/v of the pesticide or pesticides.
The aqueous pesticidal solution is then applied by spraying, or by any other known technique, to the location requiring treatment.
Thus, in a further embodiment of the present invention, there is provided a method of combating or controlling an agricultural pest which comprises applying to the pest or to a locus of the pest a pesticidally effective amount of an aqueous dispersion prepared by dispersing in water a concentrated pesticidal solution according to the invention.
The advantage of the concentrated pesticidal solutions of the present invention is that they can produce sub-micron (ca. 0.4μm) essentially mono-disperse particles on dilution into water which are stable to subsequent growth for at least 24 hours. The invention is illustrated with reference to the following Examples. In the
Examples the following abbreviations are used: ai = active ingredient SL = soluble concentrate ppm = parts per million w/v = weight/volume w/w = weight/weight init = initial
NMP = N-methylpyrrolidone GBL = γ-butyrolactone
DMSO= dimethylsulphoxide THFA = tetrahydrofurfuryl alcohol
PEG 200 = poly(ethylene glycol), average molecular weight 200
EL = ethyl lactate
EXAMPLE 1 This Example shows how the particle size is assessed when various concentrated pesticidal solutions, prepared according to the present invention, are diluted in water. Results are given for a number of invention solutions.
Method of Dispersion Testing
Formulations were tested for dispersing properties in water by adding 2.5ml solution concentrate by pipette to a stoppered Crow receiver containing 97.5ml of a CIPAC standard hard water. The initial "bloom" was noted when the first few drops were added to the water, then the receiver was inverted 3 times and homogeneity of the dispersion was noted. Checks were made at set time intervals over a 24 hour period to check for any sedimentation or crystallisation.
Particle size checks on dilutions initially and after 24 hours were carried out using a Malvern Mastersizer S. Instrument parameters were as follows: Polydisperse model Particle size values quoted:-
Obscuration 2-4% volume median diameter D(v,0.5)
Pump speed 40% volume mean diameter D[4,3]
Stirrer Speed 20% % less than 1 μm
Ultrasonics - nil The CIPAC standard hard water types that were used were CIPAC A and CIPAC C.
These have the following characteristics: CIPAC A: 20 ppm hardness; pH 5.0-6.0; Ca2+ : Mg2+ = 1:1 CIPAC C: 500 ppm hardness; pH 7.0-8.0; Ca2+ : Mg2+ = 4:1
(a) Soluble concentrates of azoxystrobin
SL formulations containing 10% w/v azoxystrobin in NMP and varying levels of lignin were prepared and tested for dilution properties. Tables 1 and 2 below show the results.
Table 1: Azoxystrobin dilutions in CIPAC A water
These results indicate that there is an optimum level of Indulin AT at around 2-3% for maintaining fine particle size.
At 5-10% there is evidence of flocculation after 24 hours, especially in CIPAC C, shown by increasing mean particle size values and a reduction in percentage less than 1 μm in size.
(b) Soluble concentrates of picoxystrobin
10% w/w SL formulations in NMP containing 1, 2 and 5% w/v lignin were prepared and dilutions analysed for particle size after 24 hours. Results are shown in Table 3.
Table 3: Picoxystrobin dilutions
(c) Soluble concentrate of tebuconazole
A 10% w/v SL formulation in NMP was prepared containing 5% lignin. Dilutions after 24 hours gave the results shown in Table 4.
Table 4: Tebuconazole dilution
(d) Soluble concentrate of cyproconazole
A 10% w/v SL formulation in NMP was prepared containing 5% lignin. The results obtained are shown in Table 5.
Table 5: Cyproconazole dilution
(e) Soluble concentrate of a picoxystrobin/cyproconazole mixture
An SL formulation of 12.5% w/v picoxystrobin and 5.0% w/v cyproconazole was prepared containing 8% w/v lignin. Dilution after 24 hours gave the results shown in Table 6.
Table 6: Picoxystrobin/cyproconazole dilution
EXAMPLE 2 This Example illustrates the use of alternative polar solvents for preparing the concentrated solutions of the invention and the use of other pesticides. SL formulations containing 10% w/w active ingredient and 4% w/w Indulin AT were prepared using the active ingredients azoxystrobin, hexaconazole, cypermethrin and mesotrione with NMP as solvent. In addition, similar formulations of azoxystrobin were prepared with the following solvents: GBL, DMSO, THFA, ethyl acetate and 50% NMP/50% PEG 200. Dilutions of these formulations (2500 ppm active ingredient in CIPAC C water) were tested by the method described in Example 1 with the results shown in Table 7.
Table 7: Alternative solvents
* Fine sub-micron particle suspension
These results show that all combinations of active ingredients and solvents gave satisfactory dilutions after 24 hours, any fine suspension passing a 75 μm sieve.
Claims (10)
- CLA SI . A concentrated pesticidal solution which comprises one or more water-insoluble pesticides and lignin dissolved in a water miscible, polar solvent.
- 2. A concentrated pesticidal solution according to claim 1 in which the amount of pesticide or pesticides used is from 0.5 to 50% w/v.
- 3. A concentrated pesticidal solution according to claim 1 or 2 in which the pesticide is a strobilurin fungicide or a triazole fungicide or a mixture thereof.
- 4. A concentrated pesticidal solution according to claim 1 or 2 in which the pesticide is a fungicide selected from the group consisting of azoxystrobin, picoxystrobin, tebuconazole, cyproconazole, and picoxystrobin in admixture with cyproconazole.
- 5. A concentrated pesticidal solution according to any one of the preceding claims in which the amount of lignin used is in the weight ratio of from 1 : 10 to 1 : lof lignin to pesticide.
- 6. A concentrated pesticidal solution according to any one of the preceding claims in which the polar solvent is selected from the group consisting of γ-butyrolactone, tetrahydrofurfuryl alcohol, ethyl lactate and N-methyl pyrrolidone.
- 7. A concentrated pesticidal solution according to any one of the preceding claims which includes a polymer stabiliser or anti-settling agent.
- 8. A concentrated pesticidal solution according to claim 7 in which the polymer stabiliser or antisettling agent is ethyl cellulose.
- 9. A concentrated pesticidal solution which comprises:(a) from 1 to 30% w/v of one or more water-insoluble pesticides and(b) lignin in the weight ratio of from 1: 10 to 1: 1 of component (a), both (a) and (b) being dissolved in a water miscible, polar solvent.
- 10. A concentrated pesticidal solution according to claim 9 which contains up to 0.5% w/v of another additive.II. A method of combating or controlling an agricultural pest which comprises applying to the pest or to a locus thereof, a pesticidally effective amount of an aqueous dispersion prepared by dispersing in water a concentrated pesticidal solution according to the invention.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0126144.5A GB0126144D0 (en) | 2001-10-31 | 2001-10-31 | Pesticidal formulations |
GB0126144.5 | 2001-10-31 | ||
PCT/GB2002/004656 WO2003037084A1 (en) | 2001-10-31 | 2002-10-15 | Pesticidal formulations |
Publications (2)
Publication Number | Publication Date |
---|---|
AU2002330647A1 true AU2002330647A1 (en) | 2003-07-10 |
AU2002330647B2 AU2002330647B2 (en) | 2007-05-10 |
Family
ID=9924882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2002330647A Ceased AU2002330647B2 (en) | 2001-10-31 | 2002-10-15 | Pesticidal formulations |
Country Status (24)
Country | Link |
---|---|
US (1) | US20050038094A1 (en) |
EP (1) | EP1441587B1 (en) |
JP (2) | JP4920870B2 (en) |
KR (1) | KR100712015B1 (en) |
CN (1) | CN1273017C (en) |
AR (1) | AR037018A1 (en) |
AT (1) | ATE316758T1 (en) |
AU (1) | AU2002330647B2 (en) |
BR (1) | BR0213563A (en) |
CA (1) | CA2465076C (en) |
CO (1) | CO5580719A2 (en) |
CR (1) | CR7327A (en) |
DE (1) | DE60209020T2 (en) |
DK (1) | DK1441587T3 (en) |
EC (1) | ECSP045090A (en) |
ES (1) | ES2253557T3 (en) |
GB (1) | GB0126144D0 (en) |
HU (1) | HUP0401911A3 (en) |
IL (1) | IL161596A0 (en) |
MX (1) | MXPA04004011A (en) |
PL (1) | PL206952B1 (en) |
RU (1) | RU2291618C2 (en) |
WO (1) | WO2003037084A1 (en) |
ZA (1) | ZA200402969B (en) |
Families Citing this family (26)
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DE10329714A1 (en) * | 2003-07-02 | 2005-01-20 | Bayer Cropscience Ag | Agrochemical formulations |
DE10343872A1 (en) * | 2003-09-23 | 2005-04-21 | Bayer Cropscience Ag | Agrochemical suspension concentrates containing azole and/or strobilurin, e.g. the fungicide tebuconazole, containing alkanol ethoxylate penetration promoter and specific polymeric dispersant to increase activity |
IL160858A (en) * | 2004-03-14 | 2015-09-24 | Adama Makhteshim Ltd | Nanoparticulate pesticidal composition and a process for its preparation |
PL1773121T3 (en) | 2004-07-06 | 2011-07-29 | Basf Se | Liquid pesticide compositions |
JP2006169167A (en) * | 2004-12-16 | 2006-06-29 | Hokko Chem Ind Co Ltd | Aqueous suspension preparation |
GB0615473D0 (en) * | 2006-08-03 | 2006-09-13 | Livie Biopesticides Ltd | Insecticidal composition |
GB0615475D0 (en) * | 2006-08-03 | 2006-09-13 | Livie Biopesticides Ltd | Insecticidal composition-dill oil |
GB0621440D0 (en) * | 2006-10-27 | 2006-12-06 | Syngenta Crop Protection Ag | Herbicidal compositions |
GB0625095D0 (en) * | 2006-12-15 | 2007-01-24 | Syngenta Ltd | Formulation |
TW200913892A (en) * | 2007-05-18 | 2009-04-01 | Valent Biosciences Corp | Cinnamon oil formulations and methods of use |
US7901701B2 (en) * | 2007-10-29 | 2011-03-08 | Lignotech Usa, Inc. | Methods for producing dried pesticide compositions |
US8999893B2 (en) | 2008-02-04 | 2015-04-07 | Dow Agrosciences Llc | Stabilized oil-in-water emulsions including meptyl dinocap |
US8110608B2 (en) | 2008-06-05 | 2012-02-07 | Ecolab Usa Inc. | Solid form sodium lauryl sulfate (SLS) pesticide composition |
US8808762B2 (en) | 2008-10-17 | 2014-08-19 | Valent Biosciences Corporation | Cinnamaldehyde and diallyl disulfide formulations and methods of use |
MX2011004091A (en) * | 2008-10-17 | 2011-07-28 | Valent Biosciences Corp | Compositions comprising cinnamon oil (and/or its component cinnamaldehyde) and diallyl disulfide, their formulations, and methods of use. |
WO2010127142A2 (en) * | 2009-04-29 | 2010-11-04 | Lignotech Usa, Inc. | Use of lignosulfonates in suspo-emulsions for producing pesticide compositions |
WO2011043748A1 (en) | 2009-10-07 | 2011-04-14 | Chrysamed Ki̇mya Sanayi̇ Ve Diş Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Composition used in the dissolution and stabilization of pesticide active agents |
JP5633329B2 (en) * | 2009-11-20 | 2014-12-03 | 住友化学株式会社 | Pest control composition |
US8968757B2 (en) | 2010-10-12 | 2015-03-03 | Ecolab Usa Inc. | Highly wettable, water dispersible, granules including two pesticides |
CN102696618A (en) * | 2011-03-27 | 2012-10-03 | 山东海利尔化工有限公司 | Germicidal composition containing picoxystrobin and cyproconazole |
WO2012130823A1 (en) | 2011-03-30 | 2012-10-04 | Basf Se | Suspension concentrates |
CN102210309A (en) * | 2011-04-22 | 2011-10-12 | 陕西汤普森生物科技有限公司 | Sterilizing composition containing picoxystrobin and triazole |
EP3270691A4 (en) * | 2015-03-18 | 2018-08-29 | Winfield Solutions, LLC | Emulsifiable concentrate liquid compositions and methods |
CN107771818A (en) * | 2016-08-29 | 2018-03-09 | 南京华洲药业有限公司 | A kind of bactericidal composition and its application containing ZEN 90160 and Cyproconazole |
AU2019313545A1 (en) * | 2018-07-31 | 2021-02-25 | Bayer Aktiengesellschaft | Controlled release formulations with lignin for agrochemicals |
US20230069185A1 (en) * | 2020-04-17 | 2023-03-02 | Dow Global Technologies Llc | Agricultural formulations |
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-
2001
- 2001-10-31 GB GBGB0126144.5A patent/GB0126144D0/en not_active Ceased
-
2002
- 2002-10-15 RU RU2004116321/15A patent/RU2291618C2/en not_active IP Right Cessation
- 2002-10-15 US US10/494,067 patent/US20050038094A1/en not_active Abandoned
- 2002-10-15 ES ES02767720T patent/ES2253557T3/en not_active Expired - Lifetime
- 2002-10-15 PL PL368415A patent/PL206952B1/en not_active IP Right Cessation
- 2002-10-15 CA CA2465076A patent/CA2465076C/en not_active Expired - Fee Related
- 2002-10-15 WO PCT/GB2002/004656 patent/WO2003037084A1/en active IP Right Grant
- 2002-10-15 DE DE60209020T patent/DE60209020T2/en not_active Expired - Lifetime
- 2002-10-15 EP EP02767720A patent/EP1441587B1/en not_active Expired - Lifetime
- 2002-10-15 AT AT02767720T patent/ATE316758T1/en active
- 2002-10-15 IL IL16159602A patent/IL161596A0/en not_active IP Right Cessation
- 2002-10-15 DK DK02767720T patent/DK1441587T3/en active
- 2002-10-15 AU AU2002330647A patent/AU2002330647B2/en not_active Ceased
- 2002-10-15 HU HU0401911A patent/HUP0401911A3/en unknown
- 2002-10-15 MX MXPA04004011A patent/MXPA04004011A/en active IP Right Grant
- 2002-10-15 BR BR0213563-9A patent/BR0213563A/en not_active Application Discontinuation
- 2002-10-15 CN CNB028215559A patent/CN1273017C/en not_active Expired - Fee Related
- 2002-10-15 KR KR1020047006254A patent/KR100712015B1/en not_active IP Right Cessation
- 2002-10-15 JP JP2003539441A patent/JP4920870B2/en not_active Expired - Fee Related
- 2002-10-24 AR ARP020104043A patent/AR037018A1/en unknown
-
2004
- 2004-04-19 ZA ZA200402969A patent/ZA200402969B/en unknown
- 2004-04-28 EC EC2004005090A patent/ECSP045090A/en unknown
- 2004-04-30 CR CR7327A patent/CR7327A/en unknown
- 2004-05-12 CO CO04043905A patent/CO5580719A2/en active IP Right Grant
-
2011
- 2011-10-27 JP JP2011236118A patent/JP2012067112A/en active Pending
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