US20090269382A1 - Formulation - Google Patents

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Publication number
US20090269382A1
US20090269382A1 US12/158,797 US15879706A US2009269382A1 US 20090269382 A1 US20090269382 A1 US 20090269382A1 US 15879706 A US15879706 A US 15879706A US 2009269382 A1 US2009269382 A1 US 2009269382A1
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Prior art keywords
product
water
agrochemical
solid
aqueous phase
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US12/158,797
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English (en)
Inventor
Patric Joseph Mulqueen
Anne Waller
Ian Malcolm Shirley
Michael Chavant
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Syngenta Ltd
Syngenta Crop Protection LLC
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Syngenta Crop Protection LLC
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Publication of US20090269382A1 publication Critical patent/US20090269382A1/en
Assigned to SYNGENTA LIMITED reassignment SYNGENTA LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAVANT, MICHAEL, WALLER, ANNE, MULQUEEN, PATRICK JOSEPH, SHIRLEY, IAN MALCOLM
Abandoned legal-status Critical Current

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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
    • A01N25/32—Ingredients for reducing the noxious effect of the active substances to organisms other than pests, e.g. toxicity reducing compositions, self-destructing compositions
    • 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
    • A01N25/002—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 a foodstuff as carrier or diluent, i.e. baits
    • A01N25/006—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 a foodstuff as carrier or diluent, i.e. baits insecticidal
    • 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
    • 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
    • A01N25/26—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 in coated particulate form
    • A01N25/28—Microcapsules or nanocapsules
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/34—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
    • A01N43/50—1,3-Diazoles; Hydrogenated 1,3-diazoles
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/74—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,3
    • A01N43/78—1,3-Thiazoles; Hydrogenated 1,3-thiazoles
    • 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
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/88—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms six-membered rings with three ring hetero atoms
    • 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
    • A01N51/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds having the sequences of atoms O—N—S, X—O—S, N—N—S, O—N—N or O-halogen, regardless of the number of bonds each atom has and with no atom of these sequences forming part of a heterocyclic ring

Definitions

  • This invention relates to novel microcapsules which comprise a biologically active compound and processes for the preparation and for the use of such microcapsules.
  • a product comprising microcapsules which themselves comprise
  • a polymeric shell (a) a polymeric shell; and (b) a core which comprises an agrochemical which has a melting point above 25° C. characterised in that the agrochemical is dispersed as a solid in a hydrophobic material which has a melting point greater than or equal to 25° C. but which does not exhibit a glass transition temperature.
  • Microcapsule technology has been in existence for a number of years. Microcapsules have a variety of uses, especially for containing dyes, inks, chemical reagents, pharmaceuticals, flavouring materials, and more especially agrochemicals, that is fungicides, bactericides, insecticides, herbicides and the like.
  • Microencapsulated formulations of agrochemicals may be exploited in a wide range of applications both in crop protection and professional products outlets, and may be applied via a variety of methods such as foliar sprays, soil application and as seed treatments. Such formulations allow the release rate of the agrochemical to be controlled over a desired period of time and find applications for weed, fungal or insect control, as termiticides, residual sprays, turf treatments and as seed treatments (amongst others).
  • agrochemical products are subject to a range of environmental factors which result in a reduction in efficacy of the formulation, including run-off and leaching from soil (which may lead to groundwater contamination), rainfastness and wash-off from seeds; water-soluble active compounds are particularly susceptible to such losses.
  • microcapsules of this invention are useful for controlling the release rate of the solid water-soluble biologically active compound, where the biologically active compound is a pesticide [agrochemical], and are particularly useful for controlling the release into any medium where water is present, eg. release of pesticidally active compounds into soil.
  • the microcapsules are even more particularly useful for controlling the release of water-soluble pesticidally active compounds into soil with a high moisture content as a result of heavy rainfall or excessive irrigation.
  • a further advantage is that such products can also reduce the amount of water soluble product that is leached to lower soil levels by heavy rainfall or irrigation.
  • Such uses may include application of these products in crop protection for the use of insecticides in vegetable crops to extend the performance of a product in soil; use of such a product to provide long term release characteristics in specific market sectors such as control of termites; use of such a product to increase the period of performance on turf, when formulated together with fertilisers as a granule, or applied directly to turf by an appropriate application method and which is then subjected to high levels of irrigation (as commonly employed on golf-courses); use of such products for the protection of seeds where applied prior to sowing and combined with appropriate inerts to provide efficient coating of the seeds; and use of such a product to provide a longer lasting residual deposit where a long lasting deposit may be required.
  • microcapsules are generally formed of polymeric material produced by a polymerisation reaction which preferably takes place at the interface between two phases, usually an aqueous phase and a water-immiscible organic phase.
  • a polymerisation reaction which preferably takes place at the interface between two phases, usually an aqueous phase and a water-immiscible organic phase.
  • they may be produced from a water-in-oil emulsion or more usually an oil-in-water emulsion.
  • Microcapsules which comprise, in the organic phase, suspensions of solid biologically active compounds in organic solvents or liquid biologically active compounds are known (e.g. as described in patent documents WO 95/13698, EP 0730406, U.S. Pat. No. 5,993,842 and U.S. Pat. No. 6,015,571, the contents of which are fully incorporated herein by reference).
  • one particular method of producing a similar effect of having an agrochemical dispersed in a diffusion limiting structure is to produce an at least partially solid matrix in which the agrochemical is retained more effectively.
  • the (non-continuous) matrix is formed via an interfacial polymerisation of an oil-in-water emulsion, in which the solid water-soluble biologically active material is dispersed within the oil.
  • carrying out said interfacial polymerisation results in the formation of a polymer (non-continuous) matrix which is distributed throughout the microcapsules, rather than being restricted to the interface, as is commonly taught in the prior art.
  • a stable suspension of the solid in a substantially water-immiscible liquid must be produced. If dispersants or surfactants are used, they must not interfere with any further processes of dispersion used in making microcapsules.
  • the suspension must be dispersed in water to produce stable, well dispersed droplets.
  • the suspension must be dispersed in water to produce stable, well dispersed droplets.
  • To produce very small droplets requires high shear forces which would tend to break down the droplets and/or release the solid from suspension.
  • Surfactants are usually required to achieve good dispersion and stable droplets.
  • the presence of one or more surfactants may make the dispersed droplet system unstable and the phenomenon of phase inversion may occur, i.e. water forms small droplets within the liquid; a water-in-oil emulsion.
  • the solid suspended in the water-inuniscible liquid is liable to migrate to the aqueous phase, particularly when emulsifying surfactants are used.
  • microcapsules which comprise a solid water-soluble, biologically active compound dispersed in a (non-continuous) matrix which is at least partially solid and which is distributed throughout the microcapsules.
  • release rate of the biologically active compound can be varied over an extremely wide range; surprisingly very slow release rates into aqueous media are possible despite the water-solubility of the compound. This confers useful benefits to products utilising such technology.
  • microcapsules One very suitable technique for the formation of said microcapsules is interfacial polymerisation via an oil-in-water emulsion; surprisingly, this results in the formation of a polymer (non-continuous) matrix which is distributed throughout the microcapsules, rather than being restricted to the interface, as is commonly taught in the prior art.
  • the liquid preferably contains a dispersant capable of keeping the solid in the liquid but which does not allow the solid to be extracted into the water when the suspension is dispersed into water.
  • the dispersant when the suspension is added to water, the dispersant must not allow phase inversion to occur.
  • Step 3 a physical dispersion of the organic phase in an aqueous phase is prepared.
  • the organic phase is added to the aqueous phase, with stirring.
  • a suitable dispersing means is employed to disperse the organic phase in the aqueous phase. Selection of dispersion process and apparatus will depend upon the desired particle size of the emulsion (and ultimate product) to be produced.
  • One suitable means of dispersion is typically a high shear rotor/stator device (such as a laboratory SilversonTM machine) for small ( ⁇ 10 micron VMD products) but other means can be employed such as CowlesTM dissolvers, simple mixing devices for larger particle sizes and even high pressure homogenisation equipment. Choice of such equipment is within the scope of one skill in the art.
  • a suitable means may be any high shear device so as to obtain a desired droplet (and corresponding microcapsule particle) size within the range from about 1 to about 200 ⁇ m; suitably from about 1 to 150 ⁇ m; more suitably from about 1 to about 50 ⁇ m; and most suitably from about 3 to about 50 ⁇ m, VMD.
  • the dispersion means is discontinued. Only mild agitation is required for the remainder of the process.
  • the organic phase comprises the solid water-soluble, biologically active compound suspended in the substantially water-immiscible liquid to be encapsulated prepared as described above in steps 1 and 2.
  • the aqueous phase comprises water and at least one emulsifier and/or protective colloid.
  • the VMD ratio of the particle size of this compound to that of the microcapsules will be typically of the value 1:5; suitably in the range 1:3 to 1:100; more suitably 1:5 to 1:20.
  • the organic phase and/or the aqueous phase must contain one or more materials which can react to form a polymer.
  • the organic phase contains at least one diisocyanate and/or polyisocyanate, whilst the aqueous phase contains at least one diamine and/or polyamine.
  • this component is added to the aqueous phase after the formation of the oil-in-water emulsion as described above in step 3.
  • Step 4 at least one diamine and/or polyamine is added to the oil-in-water emulsion through the aqueous phase, maintaining mild agitation throughout. Stirring is continued typically for 30 minutes to 3 hours until the formation of the (non-continuous) matrix is complete.
  • the reaction temperature is generally in the range from about 20° C. to about 60° C. In the situation where approximately equimolar amounts of isocyanate and amino groups are present, the reaction temperature is preferably from about 20° C. to about 40° C., and even more preferably from about 20° C. to about 30° C. In the situation where an excess of isocyanate groups are present, the reaction temperature is preferably from about 30° C. to about 60° C., and even more preferably from about 40° C.
  • a microcapsule in which a monomer is present in the disperse phase and is caused to undergo polymerisation to form the (non-continuous) matrix.
  • Such monomers should be essentially water immiscible and typically comprise a vinyl reactive monomer, for example, C1-C16 alkyl esters of acrylic and methacrylic acid such as ethyl hexyl acrylate and ethyl hexyl methacrylate.
  • the polyol component may comprise more than one polymerisable OH (hydroxyl) functional compounds, suitably comprising two or more hydroxyl groups, per molecule on average.
  • the polymerisable, hydroxyl functional compounds may be aliphatic and/or aromatic.
  • the polymerizable, hydroxyl functional compounds may be straight, cyclical, fused, and/or branched.
  • Particular polymerizable hydroxyl functional compounds include at least one diol, at least one triol, and/or at least one tetrol. Any of these polyol compounds may be monomeric, oligomeric, and/or polymeric as desired. If oligomeric and/or polymeric, the polyol(s) may be selected from one or more hydroxyl functional polyethers, polyesters, polyurethanes, polyacrylics, epoxy resins, polyamides, polyamines, polyureas, polysulfones, combinations of these, or the like. Polyether polyols such as the polyalkylene ether and polyester polyols are also suitable and these are commercially available at relatively low cost and are hydrolytically stable.
  • diols examples include ethylene glycol, 1,2-butanediol, diethylene glycol, triethylene glycol, polyalkylene glycols, such as polyethylene glycol, and also 1,2- and 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol or neopentyl glycol hydroxypivalate.
  • This may be achieved by firstly preparing a dispersion of the solid water-soluble biologically active compound in a solution of a water insoluble (non-continuous) matrix forming polymer and a water immiscible volatile solvent for that water insoluble (non-continuous) matrix forming polymer, secondly forming an emulsion of this water-immiscible mixture in water, stabilising that emulsion by an appropriate technique and then removing the volatile solvent by a suitable evaporation process, yielding a dispersion in water of microcapsules containing the water-soluble biologically active compound distributed throughout a (non-continuous) matrix of the water insoluble polymer.
  • the stabilisation of the intermediate emulsion may be achieved by any suitable microencapsulation process, such as an interfacial polycondensation by the routes well known and outlined above but also by such routes as identified in U.S. Pat. No. 5,460,817, where the technology is identified as being useful for water insoluble (and oil soluble) biologically active compounds such as chlorpyrifos and trifluralin but does not refer to utility for dispersions in an oil or polymer of a solid water-soluble biologically active compound.
  • any suitable microencapsulation process such as an interfacial polycondensation by the routes well known and outlined above but also by such routes as identified in U.S. Pat. No. 5,460,817, where the technology is identified as being useful for water insoluble (and oil soluble) biologically active compounds such as chlorpyrifos and trifluralin but does not refer to utility for dispersions in an oil or polymer of a solid water-soluble biologically active compound.
  • the encapsulation process may be carried out in a dispersion in water of the molten material at a suitable temperature during which a polymer shell is caused to separate at the interface between the dispersed oil phase and water and where the dispersion in water of the molten material itself contains the dispersed solid water-soluble biologically active compound.
  • This dispersion of solid in a molten material can be prepared by typical techniques of grinding technical biologically active compound in the molten material or by dispersing previously ground dry technical biologically active compound into molten material. Other techniques for achieving this would be apparent to a skilled person.
  • any substantially water immiscible liquid (or hydrophobic solid) used for the preparation of the dispersion of the solid water-soluble biologically active compound will be essentially retained within the microcapsule (unless removed deliberately by evaporation as discussed above). Undesired loss of solvent (or hydrophobic solid) may alter (or destabilise) the capsule structure and release characteristics.
  • One preferred embodiment of the capsule is where the water-immiscible liquid (and/or hydrophobic solid) does not migrate into the water phase and, moreover, is involatile such that drying operations on the aqueous compositions do not result in solvent loss and thus alteration of the desired capsule composition.
  • microcapsules of this invention may be produced using the following methodology:
  • Step 1 producing the solid agrochemical with the required particle size, suitably by a milling process.
  • a suitable Volume Median Diameter [VMD] particle size of the solid is 0.01-50 ⁇ m; more suitably the lower limit is 0.5 ⁇ m and even more suitably the lower limit is 1.0 ⁇ m; more suitably the upper limit is 10 ⁇ m and even more suitably the upper limit is 5 ⁇ m.
  • Step 2 suspending the solid agrochemical in a substantially water-immiscible liquid (or molten mixture with hydrophobic solid or molten hydrophobic solid).
  • the liquid (or molten mixture with hydrophobic solid or molten hydrophobic solid) is preferably a poor solvent for the solid, i.e. it will not dissolve significant quantities of the solid.
  • the liquid preferably contains a dispersant capable of keeping the solid in the liquid but which does not allow the solid to be extracted into the water when the suspension is dispersed into water.
  • the dispersant when the suspension is added to water, the dispersant must not allow phase inversion to occur.
  • steps 1 and 2 may be varied by performing a milling process to reduce the particle size of the solid agrochemical, after the compound has been suspended in the substantially water-immiscible liquid (or molten mixture with hydrophobic solid or molten hydrophobic solid) (media milling).
  • the hydrophobic meltable solid is held above its melting point and the milling operation is carried out at such an elevated temperature.
  • the agrochemical may be separately milled to the required size in a dry milling operation and added to a molten hydrophobic solid, or it may be milled in a water immiscible organic liquid and added to molten hydrophobic solid.
  • a suitable means of dispersion is typically a high shear rotor/stator device (such as a laboratory SilversonTM machine) for small ( ⁇ 10 micron VMD products) but other means can be employed such as CowlesTM dissolvers, simple mixing devices for larger particle sizes and even high pressure homogenisation equipment. Choice of such equipment is within the scope of one skill in the art.
  • a suitable means may be any high shear device so as to obtain a desired droplet (and corresponding microcapsule particle) size within the range from about 1 to about 200 ⁇ m.
  • the droplet size is from about 3 to about 150 ⁇ m, and most preferably from about 5 to about 120 ⁇ m.
  • the core also comprises a water-immiscible liquid.
  • the core is fully or partially solid; more suitably it is partially solid.
  • the VMD ratio of the particle size of this compound to that of the microcapsules will be typically of the value 1:5; suitably in the range 1:3 to 1:100; more suitably 1:5 to 1:20.
  • the organic phase and/or the aqueous phase must contain one or more materials which can react to form a polymer.
  • the organic phase contains at least one diisocyanate and/or polyisocyanate, whilst the aqueous phase contains at least one diamine and/or polyamine.
  • this component is added to the aqueous phase after the formation of the oil-in-water emulsion as described above in step 3.
  • Step 4 at least one diamine and/or polyamine is added to the oil-in-water emulsion through the aqueous phase, maintaining mild agitation throughout.
  • This part of the process may be conducted at a temperature above the melting point of the hydrophobic solid (or mixture of hydrophobic solid with suitable water-immiscible liquid).
  • the reaction product at this stage of the process can be cooled (by a range of techniques) and thereafter a reactive monomer added to the cooled reaction mixture. This cooling at this stage of the process allows the meltable hydrophobic solid to solidify.
  • an oil soluble or water-dispersible isocyanate may be added at this stage and allowed to equilibrate onto the surface of the solidified emulsion.
  • reaction temperature is generally in the range from about 20° C. to about 80° C.
  • the reaction temperature is preferably from about 20° C. to about 60° C., and even more preferably from about 20° C. to about 40° C.
  • the reaction temperature is preferably from about 30° C. to about 60° C., and even more preferably from about 40° C. to about 50° C. Reaction times in excess of 3 hours combined with temperatures of 60° C.
  • This invention includes solid agrochemicals.
  • water-soluble as used when referring to the solid agrochemcial to be encapsulated, this is defined as a water-solubility in the range of 0.1-100 g/l, preferably in the range 0.5-50 g/l, at 20° C.
  • This may be any such compound from the group comprising pharmaceuticals and agrochemicals such as insecticides, herbicides, fungicides, acaricides, rodenticides, molluscicides and plant growth regulators.
  • Suitable herbicides include 2,3,6-TBA, 2,4-D, 2-chloro-6′-ethyl-N-isopropoxymethylaceto-o-toluidide, acifluorfen, alachlor, ametryn, amicarbazone, amidosulfuron, asulam, azimsulfuron, benazolin, benfuresate, bensulfuron-methyl, bentazone, bromacil, carbetamide, chloridazon, chlorimuron-ethyl, chlorsulfuron, cinosulfuron, clomazone, cloransulam-methyl, cyanizine, cyclosulfamuron, dicamba, dichlorprop, dichlorprop-P, diflufenzopyr, dimethachlor, dimethipin, diphenamid, ethametsulfuron-methyl, ethoxysulfuron, fenoxaprop-P, flazasulfuron, f
  • Suitable fungicides include 2-phenylphenol, azaconazole, azoxystrobin, carboxin, cymoxanil, cyproconazole, dodemorph acetate, dodine, epoxyconazole, etridiazole, fenfuram, ferimzone, flusilazole, flutriafol, fuberidazole, furalaxyl, furametpyr, imazalil, metalaxyl, methasulfocarb, metominostrobin, myclobutanil, ofurace, oxadixyl, oxycarboxin, phenylmercury acetate, propiconazole, prothioconazole, pyrimethanil, pyroquilon, tetraconazole, thiabendazole and tricyclazole.
  • Suitable insecticides include abamectin, acetamiprid, aldicarb, azadirachtin, azamethiphos, bendiocarb, carbaryl, carbofuran, clothianidin, cryolite, dazomet, dimethylvinphos, DNOC, emamectin benzoate, ethiofencarb, ethylene dibromide, fenamiphos, fenobucarb, fipronil, flonicamid, imidacloprid, isoprocarb, lufenuron, methidathion, methyl isothiocyanate, metlocarb, pirimicarb, propoxur, pymetrozine, pyridaphenthion, chloranthraniliprole (RenaxapyrTM), sabadilla, spinosad, sulcofuron-sodium, thiacloprid, thiamethoxam,
  • More suitable insecticides include acetamiprid, aldicarb, azadirachtin, azamethiphos, bendiocarb, carbaryl, carbofuran, clothianidin, cryolite, dazomet, dimethylvinphos, DNOC, ethiofencarb, ethylene dibromide, fenamiphos, fenobucarb, fipronil, flonicainid, imidacloprid, isoprocarb, methidathion, methyl isothiocyanate, metlocarb, pirimicarb, propoxur, pymetrozine, pyridaphenthion, sabadilla, spinosad, sulcofuron-sodium, thiacloprid, thiamethoxam, thiofanox, triazamate, XMC and xylylcarb.
  • Suitable plant growth regulators include 1-naphthylacetic acid, 4-indol-3-ylbutyric acid, ancymidol, cloxyfonac, ethychlozate, flurprimidol, gibberellic acid, indol-3-ylacetic acid, maleic hydrazide, mefluidide, prohexadione-calcium and trinexapac-ethyl.
  • insecticides are the neonicotinoids such as acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam.
  • neonicotinoids such as acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam.
  • An especially suitable insecticide is thiamethoxam.
  • the present invention provides use of a product to combat or control an agricultural pest which comprises applying to the pest or to a locus of the pest, a pesticidally effective amount of the product.
  • the pests may include [fungal] diseases, insects and weeds.
  • the pest is a termite.
  • the concentration of the solid agrochemical is suitably from 0.1-80%, more suitably 0.1-70% [most suitably 0.1-65%] by weight of the microcapsule.
  • liquids are aromatic organic compounds such as xylenes or naphthalenes, eg. Solvesso® 200; aliphatic organic compounds such as allkyl esters, eg. Exxate® 700—Exxate® 1000, Prifer® 6813; paraffinic compounds, eg. the Nolpar® & Isopar® ranges of solvents; alkyl phthalates, such as diethyl phthalate, dibutylphthalate and dioctylphthalate; alcohols, such as isopropyl alcohol; ketones, such as acetophenone and cyclohexanone; mineral oils, eg. Cropspray® 7N or 11N; vegetable or seed oils, such as rapeseed oil; and alkylated seed oils.
  • the liquid may be a mixture of more than one compound.
  • the liquid in which the agrochemical is suspended may in itself be or comprise a second biologically active compound.
  • the hydrophobic solid with a melting point above 25 C may also be a second (or more) biologically active compound
  • the phase volumes of the disperse organic phase and the continuous aqueous phase may be varied within a wide range; typically the organic phase is present at 5 to 70% by weight; suitably from 15 to 70% by weight; and more suitably from 15 to 50% by weight based on the entire formulation.
  • the hydrophobic meltable solid with a melting point greater than or equal to 25 C is the means by which a matrix can be produced to retain the solid agrochemical more effectively within a microcapsule.
  • This meltable solid should not display a glass transition temperature so that it is effectively not a polymer.
  • Such products encompass the use of waxes with a melting point above ambient temperature (25° C.).
  • This meltable hydrophobic solid can be a single component or derived form mixtures of products designed to produce a desired melting point. This will include combinations with water immiscible liquids or low melting point hydrophobic solids that produce a mixture with a reduced melting point.
  • the fatty derivatives may be either fatty acids, fatty metallic salts of these fatty acids, fatty acid amides, fatty alcohols and fatty esters or mixtures of these.
  • the acid may be a carboxylic acid and the salts may be calcium, magnesium, zinc or aluminium salts.
  • the acid amide may be stearamide.
  • Sterols or long chain sterol, esters may also be such as cholesterol or ergosterol.
  • Preferred compounds are waxes such as hydrogenated castor oil, lanolin, beeswax and mixtures of vegetable oils and waxes such as the product PB3 TM.
  • phase diagrams can be easily constructed of the likely components to determine optimal melting points for the composite organic phase.
  • compositions may be solid solutions of wax in an oil, eutectic mixtures or even mixtures where the wax and water-immiscible oil are homogeneous above the melting point of the hydrophobic solid but on cooling the hydrophobic solid separates from the water immiscible liquid to produce domains of solid hydrophobic material that can introduce a tortuous path to retard the release of a solid agrochemical from the ultimate microcapsule.
  • the water immiscible liquid (and separately the hydrophobic meltable solid) may be an agrochemical or the hydrophobic organic phase in which the solid agrochemical is dispersed can be a eutectic mixture or solid solution of at least one meltable agrochemical in combination with a second component that may be a water immiscible liquid and which may separately also be an agrochemical.
  • the liquid (held above the melting point of the hydrophobic meltable solid) containing the solid agrochemical suitably contains a dispersant.
  • a dispersant The exact choice of dispersant(s) will depend on the choice of solid and the liquid but particularly suitable dispersants are those which act by steric hindrance and are active only at the solid/organic liquid interface and do not act as emulsifying agents.
  • Such dispersants are suitably made up of (i) a polymeric chain having a strong affinity for the liquid and (ii) a group which will adsorb strongly to the solid.
  • dispersants which may be used in microcapsules containing a solid biologically active compound suspended in a liquid [and which are generally polymeric] are given in WO 95/13698, and include products available under the tradenames Hypermer®, Atlox®, Agrimer® and Solsperse®.
  • the range of dispersant concentration used is from about 0.01 to about 10% by weight based on the organic phase, but higher concentrations may also be used.
  • Suitable systems include Solvesso® 200 and Solsperse® 117000; rapeseed oil and Solsperse® 17000; a Norpar® 15/Prifer® 6813 mixture with Z190-165TM; and Cropspray® 7N or 11N with a one or more dispersants selected from Atlox® 4912, Atlox® LP1, Agrimer® AL22 and Agrimer® AL30.
  • Such combinations are particularly suitable when the biologically active compound is thiamethoxam.
  • the surfactant or surfactants in the aqueous phase of the microcapsule suspension are selected from anionic, cationic and non-ionic surfactants with an HLB range from about 10 to about 16 that is high enough to form a stable oil-in-water emulsion; non-ionic surfactants are particularly suitable. If more than one surfactant is used, the individual surfactants may have HLB values lower than 10 or higher than 16. However, when combined together the overall HLB value of the surfactants may be in the range 10-16.
  • Suitable surfactants include polyethylene glycol ethers of linear alcohols, ethoxylated nonylphenols, tristyrylphenol ethoxylates, block copolymers of propylene oxide and ethylene oxide, and polyvinyl alcohols. Polyvinyl alcohols are particularly suitable.
  • the range of surfactant concentration in the process is from about 0.01 to about 10% by weight, based on the aqueous phase, but higher concentrations of surfactant may also be used.
  • a protective colloid may also be present in the aqueous phase. This must adsorb strongly onto the surface of the oil (molten) droplets.
  • Suitable protective colloids include polyalkylates, methyl cellulose, polyvinyl alcohols, mixtures of polyvinyl alcohols and gum arabic, and polyacrylamides. Polyvinyl alcohols are particularly suitable.
  • the amount of protective colloid employed will depend on various factors, such as molecular weight and compatibility.
  • the protective colloid may be added to the aqueous phase prior to the addition of the organic phase, or can be added to the overall system after the addition of the organic phase or the dispersion of it.
  • the protective colloid is generally present in the aqueous phase in an amount of from about 0.1 to about 10% by weight of the aqueous phase.
  • the emulsifier should not displace the protective colloid from the surface of the droplets of the organic liquid.
  • the organic phase contains at least one diisocyanate and/or polyisocyanate, whilst the aqueous phase contains at least one diamine and/or polyamine.
  • Any diisocyanate or polyisocyanate, or mixtures thereof, may be employed, provided that it is soluble in the liquid chosen for the organic phase.
  • aromatic isocyanates such as isomers of tolylene diisocyanate, isomers and derivatives of phenylene diisocyanate, isomers and derivatives of biphenylene diisocyanates, and/or polymethylenepolyphenyleneisocyanates (PMPPI) are suitable.
  • aliphatic isocyanates are suitable, for example aliphatic acyclic isocyanates such as hexamethylenediisocyanate (HMDI), cyclic aliphatic isocyanates such as isophoronediisocyanate (IPDI) or 4,4′methylenebis(cyclohexyl isocyanate), and/or trimers of HMDI or IPDI and the like.
  • HMDI hexamethylenediisocyanate
  • IPDI isophoronediisocyanate
  • trimers of HMDI or IPDI and the like trimers of HMDI or IPDI and the like.
  • Polymeric polyisocyanates, biurets, blocked polyisocyanates, and mixtures of polyisocyanates with melting point modifiers may also be used.
  • MDI is a particularly preferred polyisocyanate.
  • pegylated derivatives may be employed wherein part of the isocyanate is reacted with a suitable polyol.
  • a suitable polyol such techniques and chemistries are well known in the art.
  • the isocyanate may be added directly to a cooled (and therefore solidified) emulsion of a solid agrochemical dispersed in a hydrophobic solid. The isocyanate is allowed to equilibrate with the solidified emulsion before addition of further reactants (such as a diamine).
  • the concentration of the isocyanate(s), and the ratio(s) where more than one isocyanate is used, is/are chosen so as to obtain the desired release rate profile for the particular end application.
  • the concentration of the isocyanate(s) must also be high enough to form a (non-continuous) matrix dispersed throughout the microcapsules.
  • the isocyanate(s) will comprise from about 5 to about 75%, more suitably from about 7 to about 30%, even more suitably from about 10 to about 25% and most suitably from about 10 to about 20%, by weight of the microcapsule.
  • the diamine or polyamine, or mixtures thereof may be any such compound(s) which is/are soluble in the aqueous phase.
  • Aliphatic or alicyclic primary or secondary diamines or polyamines are very suitable, such as ethylene-1,2-diamine, diethylenetriamine, triethylenetetramine, bis-(3-aminopropyl)-amine, bis-(2-methylaminoethyl)-methylamine, 1,4-diaminocyclohexane, 3-amino-1-methylaminopropane, N-methyl-bis-(3-aminopropyl)amine, 1,4-diamino-n-butane, 1,6-diamino-n-hexane and tetraethylenepentamine.
  • Polyethyleneimines are also suitable.
  • the molar ratio of amine moieties to isocyanate moieties may be varied from about 0.1:1 to about 1.5:1.
  • either (i) approximately equimolar concentrations of amine and isocyanate moieties are employed, with the molar ratio of amine to isocyanate moieties ranging from about 0.8:1 to about 1.3:1, in which case the wall formation reaction is suitably carried out at a temperature above the melting point of the hydrophobic solid or, when a separate cooling step in introduced to the process to reduce the temperature to below the melting point of the hydrophobic solid, from about 20° C. to about 40° C., even more preferably from about 20° C.
  • the wall formation reaction is preferably carried out at a temperature from about 30° C. to about 60° C., even more preferably from about 40° C. to about 50° C.
  • Suitable glycols for addition through the aqueous phase include those taught above and which are water soluble. These may also include simple polyhydroxylic glycols, for example, suitable diols are ethylene glycol, 1,2-butanediol, diethylene glycol, triethylene glycol, polyalkylene glycols, such as polyethylene glycol, and also 1,2- and 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol or neopentyl glycol hydroxypivalate.
  • polyols having 3 or more hydroxyl groups in the molecule which may be used additionally, if desired, include trimethylolpropane, trimethylolethane, glycerol, erythritol, pentaerythritol, di-trimethylolpropane, dipentaerythritol, thimethylol-benzene and trishydroxyethyl isocyanurate. Higher functionality may be employed by use of the various sugars such as fructose, dextrose, glucose and derivatives thereof. Mixtures of water soluble and oil soluble reactive hydroxyl containing compounds are also contemplated. Polyamides may be produced in a similar manner by selection of an appropriate acid feedstock (such as sebacoyl chloride). Mixtures, in any ratio, of polyureas, polyurethanes and polyamides are also part of the present invention.
  • an appropriate acid feedstock such as sebacoyl chloride
  • the polymeric shell is a polymer which is a polyurea, a polyamide or a polyurethane or is a mixture of two or more of these polymers; more suitably it is a polyurea.
  • oil soluble amines may be contemplated as being added to the oil phase prior to preparation of the aqueous dispersion and thereafter a suitable water dispersible isocyanate reactant may be added to complete the interfacial reaction.
  • the present invention provides a process of making a product as herein described comprising the steps
  • the process comprises the step of rapidly cooling an emulsion to below the melting point of the hydrophobic material.
  • the process involves a step where an isocyanate is introduced through the aqueous phase.
  • the release rate of the solid agrochemical can be varied from a half-life [T50; the time taken for 50% of the active ingredient to be lost from the capsule (i.e. released)] value of a few hours up to several months or years. It is surprising that such a wide range of release rates is achievable for a solid agrochemical, and it is particularly unexpected that extremely slow release rates into an aqueous sink are obtained.
  • mixtures of microcapsules with different release rates may be combined in a single formulation, to provide a tailored release profile.
  • the capsule compositions, as produced, will be dispersions in water. These microcapsules may be post-formulated, to stabilise them for long term shelf life storage, with anti-settling agents, which include water-soluble polysaccharides such as xanthan gum, water-insoluble polysaccharides such as microcrystalline cellulose and structured clays such as bentonites. Microcrystalline cellulose is a particularly suitable anti-settling agent.
  • agrochemicals added to the aqueous phase, either as solids, emulsions (either as an emulsion of a compound that is liquid at ambient temperature or as an emulsion of a solution of an agrochemical in a suitable essentially water immiscible solvent) or as a solution in water or mixtures of the above.
  • emulsions either as an emulsion of a compound that is liquid at ambient temperature or as an emulsion of a solution of an agrochemical in a suitable essentially water immiscible solvent
  • the agrochemical added directly to the external aqueous phase may be the same compound as within the microcapsule.
  • the aqueous phase comprises an agrochemical.
  • an agrochemical in the aqueous phase has a water-solubility in the range of 0.1 to 100 g/l at 20° C.; more suitably it is a neonictinoid insecticide; even more suitably it is acetamiprid, clothianidin, imidacloprid, thiacloprid or thiamethoxam; and most suitably it is thiamethoxam.
  • the concentration of this compound may be varied within a relatively wide range. Generally the concentration of this compound will be between 0 and 50% by weight, based on the total aqueous phase.
  • water based compositions it is possible to dry such water based compositions. This can be achieved by concentration of the water based composition (e.g. sedimentation, centrifugation) followed by a suitable drying technique such as drum drying. It may also be achieved by techniques such as spray-drying [including fluid bed agglomeration techniques and similar granulation processes] or, if the compounds are heat sensitive, freeze drying or atmospheric freeze drying. Spray drying techniques are preferred as they are fast and may conveniently be applied to dispersions such as the microcapsules of this invention. Production of dry product from a water based dispersion usually requires the addition of further inert components to protect the integrity of the capsules during the drying stage, or during storage and also to allow easy complete re-dispersion of the dry product back into water for application.
  • concentration of the water based composition e.g. sedimentation, centrifugation
  • a suitable drying technique such as drum drying. It may also be achieved by techniques such as spray-drying [including fluid bed agglomeration techniques and similar granulation processes]
  • Such inerts include, but are not limited to, essentially water soluble film-forming agents such as polyvinyl alcohols, polyvinylpyrrolidones and polyacrylic acids.
  • Other ingredients may include surfactants, dispersants, sugars, lignosulfonates, disintegrants such as cross-linked polyvinylpyrrolidones and maltodextrins.
  • the dried products moreover, may contain other agrochemicals that are not encapsulated as described above for the solid agrochemical.
  • Such use may be as a granular product in rice cultivation, for use on cultivated turf and also as a feedstock for blending into fertiliser mixtures for subsequent application to soil, turf or other targets such as rice.
  • the dry product is granular.
  • the dry product is water-dispersible.
  • the wide range of release rates achievable with the technology of the present invention allows exploitation in several applications, including traditional crop protection outlets both as a foliar or a soil applied product, for use on cultivated turf, as a seed treatment and numerous other applications such as protection against termites and as a long-lasting residual spray for general pest control.
  • the use of a composition as described herein for the protection of industrial materials [referred to as “materials protection”].
  • the industrial material to be protected is selected from the group consisting of: wood; plastic; wood plastic composite; paint; paper; and wallboards.
  • the protection may be in the form of a product that deters, repels or kills an attack of a target, such as in the area of termite protection, or house protection against invasive insect species, a barrier can be places between the article to be protected (eg a building) and the external environment in which the pest species normally resides.
  • Industrial Material includes those materials used in construction and the like.
  • Industrial Material may be structural timber, doors, cupboards, storage units, carpets, particularly natural fibre carpets such as wool and hessian, plastics, wood (including engineered wood) and wood plastic composite.
  • the Industrial Material is a coating.
  • “Coating” includes compositions applied to a substrate, for example, paints, stains, varnishes, lacquers, primers, semi-gloss coatings, gloss coatings, flat coatings, topcoats, stain-blocking coatings, penetrating sealers for porous substrates, concrete, marble, elastomeric coatings, mastics, caulks, sealants, board and panelling coatings, transportation coatings, furniture coatings, coil coatings, bridge and tank coatings, surface marking paints, leather coatings and treatments, floor care coatings, paper coatings, personal care coatings [such as for hair, skin or nails], woven and non-woven fabric coatings, pigment printing pastes, adhesive coatings [such as, for example, pressure sensitive adhesives and wet- or dry-laminating adhesives] and plaster.
  • paint means paint, varnish, stain, lacquer or plaster; more suitably “coating” is a lacquer or alternatively “coating” may mean paint. Paint may comprise, for example, a film former and a carrier (which carrier can be water and/or an organic solvent) and optionally a pigment.
  • “Industrial Material” includes adhesives, sealants, joining materials, joints and insulation material.
  • Wood is to be understood to include wood and wood products, for example: derived timber products, lumber, plywood, chipboard, flakeboard, laminated beams, oriented strandboard, hardboard, particle-board, tropical wood, structural timber, wooden beams, railway sleepers, components of bridges, jetties, vehicles made of wood, boxes, pallets, containers, telegraph-poles, wooden fences, wooden lagging, windows and doors made of wood, plywood, chipboard, joinery, or wooden products which are used, quite generally, for building houses or decks, in building joinery or wood products that are generally used in house-building including engineered wood, construction and carpentry.
  • “Industrial Material” also includes wallboards such as gypsum based wallboards.
  • “Industrial Materials” comprising a composition as herein described.
  • said Industrial materials are selected from the group consisting of: wood; wood plastic composite; paint; paper; and wallboards.
  • said Industrial materials comprise wood.
  • ways in which an Industrial Material can be treated with a product according to the invention are: by including said product in the Industrial Material itself, absorbing, impregnating, treating (in closed pressure or vacuum systems) said material with said fungicide, dipping or soaking the building material, or coating the building material for example by curtain coating, roller, brush, spray, atomisation, dusting, scattering or pouring application.
  • microcapsules allow for an extended period of biological control compared to non-encapsulated formulations, and for soil applied products the extent of leaching may also be reduced by the use of such microcapsules; the latter is particularly relevant for those active compounds with appreciable water solubility disclosed within this invention, whereby their substantial water solubility renders them prone to leaching when applied in an non-encapsulated form.
  • the microcapsules are suspended in an aqueous medium comprising a suspension of non-encapsulated agrochemical, both rapid knockdown activity and an extended period of biological control may be achieved, particularly for insecticides.
  • Other utilities include incorporation of such products into materials where a slow release of a water soluble material is desired, such as for treatment of water bodies and addition to centre pivot irrigation systems where high volumes of water rapidly leach active materials.
  • microcapsule suspensions thus produced may be utilized in the normal fashion of such products, i.e. by packaging the suspension and ultimately transferring the suspension into a spray tank or other spray equipment, in which it is mixed with water to form a sprayable suspension.
  • a range of application techniques may be utilised for the soil application of such microcapsules, including pre-planting and post-planting applications either as a dilute spray or as a more concentrated drench, including direct application into the planting hole. Application may also be made to seedling trays etc. prior to transplant.
  • the microcapsules of this invention may be applied as a soil drench underneath the foundations, as a perimeter ‘trench and treat’ barrier around the outside of the foundations, or applied directly onto concrete.
  • the suspension of microcapsules may be converted into a dry microcapsule product by spray drying or other known techniques and the resulting material packaged in dry form.
  • microcapsules which themselves comprise
  • a polymeric shell (a) a polymeric shell; and (b) a core which comprises an agrochemical which has a melting point above 25° C. characterised in that the agrochemical is dispersed as a solid in a hydrophobic material which has a melting point greater than or equal to 25° C. but which does not exhibit a glass transition temperature.
  • water immiscible liquid also includes hydrophobic meltable solids above their melting point and mixtures of such hydrophobic solids (above their melting point) with water immiscible liquids
  • microcapsule formulation in which microcapsules comprise a solid agrochemical dispersed in a (non-continuous) matrix which is at least partially solid and which is distributed throughout the microcapsules, in which the microcapsules are suspended in an aqueous phase during their formation.
  • microcapsule formulation as described above to control the release rate of a pesticide thereby providing an extended period of biological control.
  • microcapsule formulation as described above to control the release rate of a pesticide thereby providing a reduction in leaching of the pesticide.
  • a (non-continuous) matrix-forming compound suitable a polymer
  • microcapsule formulation as described above to improve safety of an agrochemcial either to the manufacturer, user, or the environment.
  • thiamethoxam can be suspended in a meltable hydrophobic solid, followed by encapsulation within a polyurea wall, wherein isocyanate moieties for the formation of the polyurea wall are dissolved in the meltable hydrophobic solid.
  • Such formulations are not trivial to prepare successfully due to the high water-solubility of thiamethoxam (4.1 g/l at 20° C.) which means there is a tendency for the particles of thiamethoxam to migrate into the aqueous phase during the emulsification process and/or before the meltable hydrophobic solid has solidified and the formation of the microcapsule wall is complete.
  • Preventing excessive migration of thiamethoxam particles into the aqueous phase is particularly challenging for this type of formulation due to the elevated temperatures employed during the emulsification process.
  • Thiamethoxam was encapsulated using the following process according to the recipes given in Table 1. Initially thiamethoxam (re-ground in an air jet mill or similar) was dispersed into a meltable hydrophobic solid (wax) in the presence of an oil-soluble dispersant; this dispersion was carried out using high shear at a temperature typically 10-20° C. above the melting point of the meltable hydrophobic solid. An isocyanate was subsequently dissolved into the thiamethoxam suspension. This suspension was then emulsified into an aqueous solution of polyvinyl alcohol (emulsification being carried out at temperature typically 10-20° C. above the melting point of the wax).
  • Paraffin wax melting point 53-57° C.
  • beeswax synthetic, melting point 61-65° C.
  • PB3TM (melting point 38-44° C.) is a blend of vegetable oil and hydrogenated vegetable oil supplied by Aarhus.
  • Docosane (melting point 42° C.) is available from Sigma-Aldrich.
  • Solvesso® 100 is an aromatic hydrocarbon solvent supplied by Exxon.
  • Rapeseed oil (from Brassica rapa ) was sourced from Fluka.
  • Cropspray® 7N is a mineral oil supplied by Sun Oil Company.
  • Agrimer® AL22 and AL30 are alkylated vinylpyrrolidone copolymers supplied by ISP.
  • Solsperse® 17000 is a polymeric dispersant supplied by Lubrizol.
  • Desmodur® Z4470 is the trimer of isophoronediisocyanate supplied by Bayer as a 70% solution in naphtha 100.
  • Desmodur® W is 4,4′-methylenebis(cyclohexyl isocyanate) supplied by Bayer.
  • Gohsenol® GL05 is a polyvinylalcohol supplied by Nippoii Gohsei.
  • meltable hydrophobic solid contained within the capsules may consist of a mixed wax/solvent system.
  • Thiamethoxam was encapsulated according to the recipes given in Table 2 using the same methodology as in Examples 1, but with the additional step of dissolving a solvent in the suspension of thiamethoxam in wax prior to emulsification.
  • a meltable hydrophobic solid contained within the capsules may consist of a mixed wax/solvent system; in these examples the internal content of the capsules comprises a mixture of millbases, in each of which thiamethoxam had been dispersed prior to mixing of the millbases.
  • Thiamethoxam was encapsulated using the following process according to the recipes given in Table 3.
  • a finely ground suspension of thiamethoxam in a substantially water immiscible solvent was mixed with a suspension of thiamethoxam in a wax at a temperature above the melting point of the wax. Encapsulation was then carried out according to the process described in Examples 1.
  • thiamethoxam can be suspended in a wax, followed by encapsulation within a polyurea wall, wherein the isocyanate moieties for the formation of the polyurea wall are added to an aqueous emulsion of the dispersed thiamethoxam in wax after solidification of the wax.
  • This example also uses a novel cooling method which allows a higher concentration of thiamethoxam to be obtained in the final formulation.
  • Thiamethoxam was encapsulated using the following process according to the recipe given in Table 4. Initially thiamethoxam (pre-ground in an air jet mill or similar) was dispersed into the wax in the presence of an oil-soluble dispersant; this dispersion was prepared using high shear at a temperature typically 10-20° C. above the melting point of the wax. This dispersion (suspension) was then emulsified into an aqueous solution of polyvinyl alcohol (emulsification being carried out at temperature typically 10-20° C. above the melting point of the wax). The emulsion was then cooled rapidly to below the melting point of the wax by the addition of carbo-ice to the emulsion, stirring throughout with a low shear mixer.
  • microcapsules prepared according to examples 1-3 are stable upon high temperature storage.
  • Formulations prepared according to examples 1-3 were stored for up to 3 weeks at 50° C., during which they showed essentially no changes in particle size; the results are given in Tables 5 & 6 below.
  • Encapsulated suspensions of thiamethoxam in wax were mixed with a coating polymer

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US8808720B2 (en) * 2005-12-23 2014-08-19 Syngenta Limited Formulation
US20090226496A1 (en) * 2005-12-23 2009-09-10 Syngenta Limited Formulation
US20130149382A1 (en) * 2010-05-27 2013-06-13 Exosect Limited Liquid compositions comprising a sustained release system for insecticides
US20110301036A1 (en) * 2010-06-07 2011-12-08 Dow Agrosciences Llc Microcapsule suspensions including high levels of agriculturally active ingredients
WO2011156048A1 (en) * 2010-06-07 2011-12-15 Dow Agrosciences Llc Microcapsule suspensions including high levels of agriculturally active ingredients
AU2011264613B2 (en) * 2010-06-07 2015-01-29 Dow Agrosciences Llc Microcapsule suspensions including high levels of agriculturally active ingredients
US11033025B2 (en) 2011-04-20 2021-06-15 Terramera Exco Holdings Ltd. Coating compositions for pathogen control in monocotyledonous plants
WO2013066950A1 (en) * 2011-11-01 2013-05-10 Dow Agrosciences Llc Stable pesticidal compositions
CN104010496A (zh) * 2011-11-01 2014-08-27 陶氏益农公司 稳定的农药组合物
US20170369386A1 (en) * 2014-12-31 2017-12-28 Dow Agrosciences Llc Microencapsulated nitrification inhibitor compositions
US10544066B2 (en) * 2014-12-31 2020-01-28 Dow Agrosciences Llc Microencapsulated nitrification inhibitor compositions
US10645932B2 (en) 2016-12-15 2020-05-12 Wellmark International Extended release formulation
US10645931B2 (en) 2016-12-15 2020-05-12 Wellmark International Extended release formulation
WO2018111685A1 (en) * 2016-12-15 2018-06-21 Wellmark International Extended release formulation
US11122806B2 (en) 2018-10-19 2021-09-21 Gold Bond Building Products, Llc Antimicrobial coating for building panel
US11731904B2 (en) 2018-10-19 2023-08-22 Gold Bond Building Products, Llc Antimicrobial coating for building panel
US12098100B2 (en) 2018-10-19 2024-09-24 Gold Bond Building Products, Llc Antimicrobial coating for building panel

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US20090226496A1 (en) 2009-09-10
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EP1965638B1 (en) 2011-10-19
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