EP1246527A1 - Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide - Google Patents

Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide

Info

Publication number
EP1246527A1
EP1246527A1 EP00960510A EP00960510A EP1246527A1 EP 1246527 A1 EP1246527 A1 EP 1246527A1 EP 00960510 A EP00960510 A EP 00960510A EP 00960510 A EP00960510 A EP 00960510A EP 1246527 A1 EP1246527 A1 EP 1246527A1
Authority
EP
European Patent Office
Prior art keywords
pyrethroid
active ingredient
process according
preparation
formulation
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.)
Withdrawn
Application number
EP00960510A
Other languages
German (de)
English (en)
Inventor
Claude Franson
Bernard Lambert
Michel Bourgogne
Claude Taranta
Michel Henriet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer CropScience SA
Original Assignee
Bayer CropScience SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayer CropScience SA filed Critical Bayer CropScience SA
Priority to EP00960510A priority Critical patent/EP1246527A1/fr
Publication of EP1246527A1 publication Critical patent/EP1246527A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
    • A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N53/00—Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof

Definitions

  • the present invention relates to a process of preparation of aqueous suspension concentrates containing a pyrethroid and the formulations so obtained.
  • SC aqueous suspension concentrates referred herein as "SC” or aqueous flowables consist of solid particles of anrganic active ingredient which are homogeneously dispersed in water. These solvent free suspensions are free from toxicity and fiammability concerns associated with the use of oils and organic solvents.
  • pyrethroid SC formulations cover a wide range of pyrethroid active ingredients.
  • the invention therefore relates to a process of preparation of an aqueous suspension concentrate containing a pyrethroid active ingredient comprising:
  • the invention relates to a specific way for producing a pyrethroid SC, the concentration of the active ingredient being 5 to 500 g/l, in particular 7. to 300 g/l.
  • the preferred active ingredient incorporated in said aqueous suspension concentrates is deltamethrin or acrinathrin.
  • the final composition is designed so as to keep and to optimize the performance and the quality of the milling (mainly in terms of fineness).
  • a pyrethroid SC is prepared by dispersion of the pyrethroid active ingredient into water followed by a wet milling process.
  • a suitable active ingredient e.g. deltamethrin or acrinathrin
  • a suitable active ingredient must be insoluble or fairly poorly soluble in water so as to inhibit crystal growth during ageing studies.
  • the active ingredient must not be sensible to hydrolysis. Its melting point should be sufficiently high enough to allow an efficient grinding process and to provide adequate stability at a temperature over 45°C.
  • the invention relates more particularly to a process wherein the pyrethroid is deltamethrin or acrinathrin.
  • One preferred process is a process wherein a high shear mixer or dispersor and a surfactant combination made of an ionic wetting agent and an ionic dispersing agent are used in step A.
  • the dispersion of the pyrethroid active ingredient e.g. deltamethrin or acrinathrin
  • the dispersion of the pyrethroid active ingredient depends on the following parameters:
  • the pressure involved in the liquid (e.g. water) penetrating the agglomerates is the pressure involved in the liquid (e.g. water) penetrating the agglomerates.
  • the penetration rate of the liquid (e.g. water) into the solid agglomerates is the penetration rate of the liquid (e.g. water) into the solid agglomerates.
  • the Premix which has to be milled contains a high loading of active ingredient, between 40 and 90 % w/w, preferably between 50 and 70 % w/w.
  • an efficient high shear mixer such as a Silverson mixer, an Ultraturrax mixer or a colloid mill so as to reach a fineness of approximately 200 microns.
  • the ionic wetting agents and ionic dispersing agents are selected from surfactants comprising sodium alkylsulphates, sodium alkyl ether sulfates, alkyl- or alkylphenylsulfonates, sodium lignosulfonate, sodium 2,2'-dinaphtylmethane-6,6'- disulfonate, sodium dibutylnaphtalenesulfonate, sodium oleylmethyltauride, neutralized phosphoric ester or sulfuric ester based on a polyethoxylated polyarylphenol.
  • surfactants comprising sodium alkylsulphates, sodium alkyl ether sulfates, alkyl- or alkylphenylsulfonates, sodium lignosulfonate, sodium 2,2'-dinaphtylmethane-6,6'- disulfonate, sodium dibutylnaphtalenesulfonate, sodium oleylmethyltauri
  • sodium laurylsulphate e.g. Sipon LCS 98®
  • a mixture of sodium alkyl ether sulfate and a sodium alkylnaphtalenesulfonate formaldehyde condensate adsorbed on silica e.g. Dispersant SI®
  • the triethanolamine or potassium salt of an acid ester of a polyethoxylated tristyryl phenol e.g. Soprophor FL® (tre ano ⁇ amine salt) or Soprophor FLK® (potassium salt)
  • the surfactant combination content is preferably 1 to 30 % w/w, in particular 3 to 20 % w/w.
  • the premixing step requires the use of a suitable antifoam to prevent the formation of undesirable foam.
  • the premix contains preferably 0.05 to 3 % w/w, in particular 0.1 to 2 % w/w of an antifoam based on silicone oils such as a mixture of polydimethylsiloxanes supplied as a compound (e.g. Rhodorsil 416® and/or Rhodorsil 426®).
  • Milling is a complex process during which the penetration of a liquid (e.g. water) into channels existing between solid aggregates may provide sufficient excess of air pressure to bring about disintegration. However the energy required for the breakdown of little particles into smaller units is provided by mechanical impaction between beads and particles.
  • the whole milling equipment consists of a horizontal chamber equipped with a central pumping agitator shaft which is electrically rotated (several thousand rolls per minute). Examples of wet milling equipments commercially available are sand mills, ball mills (e.g. Dyno Mill®).
  • the Premix is pumped through the milling chamber containing grinding beads.
  • the grinding efficiency depends on the rotation speed of the shaft, and hence the pumping rate as well as on the the volume of the grinding elements, i.e. beads made of keramic, glass or steel, present in the milling chamber.
  • the volume of beads is preferably ranging from 65 to 95 %, in particular from 75 to 85 %.
  • a small fraction of the applied energy is used during the milling phase while most of the energy is dissipated as heat.
  • the rise of temperature must be limited by intensive cooling of the jacketed grinding container.
  • milling of high temperature sensitive materials becomes also feasible.
  • the pyrethroid active ingredient must be milled and dispersed until the particle sizes in the suspension are 0.1 to 10 microns (mean diameter). So the invention relates more specifically to a process wherein the pyrethroid active ingredient is milled and dispersed in step B preferably to a fineness below 5 microns so as to to produce a stable and bioactive final product.
  • the stabilisation of the grinded premix is usually achieved by the use of the above- mentioned ionic surfactants generating repulsive forces which can overcome the ubiquitous and natural Van der Waals attraction between the solid particles.
  • the dispersed particles of the pyrethroid e.g. deltamethrin or acrinathrin
  • the dispersed particles of the pyrethroid have an inherent tendency to settle down under gravity to the bottom of the container. This is due to the difference of state (solid/liquid) and density between the dispersed active ingredient content and the aqueous phase.
  • the rate of sedimentation can be modelised using the following Stockes formula:
  • the inhibition of sedimentation can be achieved by the use of inert solid fine particles in combination with a suitable thickener.
  • Oxides such as silica (e.g. Wessalon S®) and alkaline earth metal silicates such as magnesium aluminosilicates (e.g. Vangel B®) can form "chain aggregates". Above a certain volume fraction the "chain aggregates” may form a "three dimensional gel network" in the aqueous phase containing the dispersed oxides particles.
  • the content of swelling agents is preferably 0.5 to 10 % w/w, in particular 1.5 to 4% w/w.
  • a thickener such as a swellable anionic heteropolysaccharide such as xanthan gum (e.g. Rhodopol 23 ® or r e/zan ® ) is also necessary to obtain a significant long term storage stability and to prevent sedimentation of solid particles.
  • Xanthan gum which is produced by fermentation of carbohydrates by means of Xanthomonas microorganisms forms a network of entangled rod molecules in water which acts against settling down.
  • the content of swellable polysaccharides is preferably 0 to 5 % w/w, in particular 0.2 to 3.5 % w/w.
  • the aqueous solution of the thickener is prepared in a separate vessel by using a high speed agitator to provide a good dispersion and an efficient swelling of the thickener and is added to the Premix obtained in step B.
  • the pyrethroid SC additionally comprises a preservative to protect the solution of the thickener against bacterial development so as to prevent a complete destruction of the suspending network.
  • a preservative to protect the solution of the thickener against bacterial development so as to prevent a complete destruction of the suspending network.
  • Examples of efficient preservatives are formaldehyde and alkyl parahydroxybenzoate (e.g. propyl parahydroxybenzoate such as Preserval P ® ).
  • the content of preservative in the pyrethroid SC is preferably 0.15 to 3 % w/w, in particular 0.1 to 1.5 % w/w.
  • the pyrethroid SC must be protected against low temperatures (frost).
  • the pyrethroid SC optionally contains an antifreeze selected from glycols (e.g. monopropylene glycol and ethylene glycol), triols (e.g. glycerol), urea or an inorganic salt (e.g. calcium chloride), in particular monopropylene glycol.
  • the content of the antifreeze is preferably 0 to 18 % w/w, in particular 0 to 16 % w/w.
  • the further dilution of the pyrethroid SC in water prior to application in the field leads to a spray mixture free from inclusive and surface foams.
  • the air bubbles which can affect the application of the spray mixture on the crop can be eliminated by using a non ionic oil-in-water emulsion of polydimethyisiloxanes (e.g. Rhodorsil 426R ® ).
  • the content of the antifoam is preferably 0 to 1 % w/w, in particular 0 to 0,5 % w/w.
  • auxiliaries such as an active ingredient stabiliser (e.g. acetic acid, citric acid) and a colouring agent may be added to the pyrethroid SC according to the invention.
  • the content of stabiliser is preferably 0 to 1 % w/w.
  • the content of colouring agent is preferably 0 to 2 % w/w.
  • the suspensibility to check the homogeneity of the treatment which has to be superior to 85 %.
  • the viscosity values of the pyrethroid SC according to the invention are 150 - 500 mPas at 30 rpm (Brookfield measurement).
  • the invention also relates to a method of controlling harmful insects, which comprises applying an effective amount of the above-mentioned pyrethroid SC in the form of an aqueous dilution to these harmful insects or to the plants, soils, surfaces, and the like infested with them, and to the use of the pyrethroid SC in crop protection or environmental health.
  • compositions according to the invention are simply applied by diluting the suspension concentrates with the desired amount of water, stirring the mixture briefly and applying to the plants, soils, surfaces and the like.
  • the present invention using the process described above is illustrated by the following examples.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Zoology (AREA)
  • Agronomy & Crop Science (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • Wood Science & Technology (AREA)
  • Environmental Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention porte sur un procédé de préparation d'un concentré d'une suspension aqueuse contenant comme principe actif un pyréthrinoïde comprenant les étapes suivantes: A) mouillage du principe actif de pyréthrinoïde par un liquide, normalement de l'eau (prémélangeage); B) dislocation des agrégats et des agglomérats (mouture du prémélange de l'étape A); et C) stabilisation du prémélange moulu (dilution et épaississement). L'invention porte également sur les préparations ainsi obtenues.
EP00960510A 1999-08-26 2000-08-23 Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide Withdrawn EP1246527A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00960510A EP1246527A1 (fr) 1999-08-26 2000-08-23 Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99402128 1999-08-26
EP99402128 1999-08-26
PCT/EP2000/008225 WO2001013720A1 (fr) 1999-08-26 2000-08-23 Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide
EP00960510A EP1246527A1 (fr) 1999-08-26 2000-08-23 Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide

Publications (1)

Publication Number Publication Date
EP1246527A1 true EP1246527A1 (fr) 2002-10-09

Family

ID=8242098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00960510A Withdrawn EP1246527A1 (fr) 1999-08-26 2000-08-23 Preparation de concentres de suspensions aqueuses contenant un pyrethrinoide

Country Status (5)

Country Link
EP (1) EP1246527A1 (fr)
AU (1) AU7279200A (fr)
BR (1) BR0013543A (fr)
TR (1) TR200200503T2 (fr)
WO (1) WO2001013720A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029626B1 (fr) * 1979-11-23 1983-03-16 Shell Internationale Researchmaatschappij B.V. Suspension pesticide à base d'eau et procédé pour sa préparation
JPS5695107A (en) * 1979-12-28 1981-08-01 Sumitomo Chem Co Ltd Suspension insecticidal and acaricidal composition
DE3324499A1 (de) * 1983-07-07 1985-01-17 Hoechst Ag, 6230 Frankfurt Verfahren zur herstellung von quellmittel enthaltenden pflanzenschutzmitteldispersionen
FR2670085B1 (fr) * 1990-12-10 1996-12-13 Rhone Poulenc Chimie Suspensions phytosanitaires.
DE4417995C2 (de) * 1994-05-21 2003-03-20 Stefes Agro Gmbh Pirimicarb enthaltende Suspensionskonzentrate
DE4433653A1 (de) * 1994-09-21 1996-03-28 Hoechst Schering Agrevo Gmbh Thixotrope wäßrige Pflanzenschutzmittel-Suspensionen
LV12032B (en) * 1995-04-24 1998-09-20 ARGO-CHEMIE Novenyvedoszer Gyarto Ertekesito es Forgalmazo Kft. METHODS OF PESTICIDE COMPOSITIONS AND THEIR ACQUISITION
EP1005270B1 (fr) * 1997-08-22 2003-02-26 Plaaskem (Proprietary) Limited Dispositif doseur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0113720A1 *

Also Published As

Publication number Publication date
WO2001013720A1 (fr) 2001-03-01
BR0013543A (pt) 2002-05-14
AU7279200A (en) 2001-03-19
TR200200503T2 (tr) 2002-06-21

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